US20040222567A1 - Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same - Google Patents
Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same Download PDFInfo
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- US20040222567A1 US20040222567A1 US10/866,824 US86682404A US2004222567A1 US 20040222567 A1 US20040222567 A1 US 20040222567A1 US 86682404 A US86682404 A US 86682404A US 2004222567 A1 US2004222567 A1 US 2004222567A1
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- Prior art keywords
- lead frame
- molding
- block
- lower mold
- detecting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14639—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components
- B29C45/14655—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles for obtaining an insulating effect, e.g. for electrical components connected to or mounted on a carrier, e.g. lead frame
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/84—Safety devices
- B29C45/842—Detection of insert defects, e.g. inaccurate position, breakage
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/56—Encapsulations, e.g. encapsulation layers, coatings
- H01L21/565—Moulds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to inset-molding. More specifically, the present invention relates to a semiconductor chip molding apparatus and to a method of detecting whether a lead frame is positioned properly in the same.
- the manufacturing of semiconductor devices includes an assembly method in which chips are packaged once they have undergone an electrical die sorting (EDS) process in which individual chips having certain electrical and physical characteristics are sorted. Hence, only non-defective chips are packaged.
- EDS electrical die sorting
- the assembly method includes a die bonding process of attaching the non-defective chip on a pad of a lead frame, a wire bonding process of electrically connecting bonding pads of the chip to inner lead tip of the lead frame via connector wires, a molding process of encapsulating the chip using an epoxy molding compound so as to protect the chip, the connector wires, the inner leads, and so on, and a forming process of finalizing the form of the chip package so that the chip package may be mounted on a printed circuit board (PCB).
- PCB printed circuit board
- the molding process is performed by a semiconductor molding apparatus.
- an epoxy molding compound is heated and pressurized to assume a molten state.
- the molten compound is then injected into molding cavities to encapsulate semiconductor chips on lead frames set in position in the cavities.
- the conventional semiconductor chip molding apparatus also has a sensing unit that determines whether the lead frames are properly positioned in the apparatus before the semiconductor chips are encapsulated with the epoxy molding compound. Thus, the sensing unit attempts to ensure that the molding process is performed properly.
- FIG. 1 is a cross-sectional view of the conventional semiconductor chip molding apparatus.
- the conventional semiconductor chip molding apparatus 90 includes a lower platen 70 , and an upper platen 80 opposed to the lower platen 70 .
- a lower mold 50 is integrated with the lower platen 70
- an upper mold 60 is integrated with the upper platen 80 .
- the lower mold 50 includes a plurality of locater pins 53 at the periphery thereof.
- the locater pins 53 guide a lead frame 20 into position on the lower mold 50 .
- a port block 55 is disposed at a central portion of the lower mold 50 .
- the molding resin such as an epoxy molding compound, is supplied through the port block 55 after the lead frame 20 has been set on the lower mold 50 .
- the conventional semiconductor chip molding apparatus 90 further includes a sensing unit to determine whether the lead frame has been properly set on the lower mold 50 .
- the sensing unit includes a sensing plate 57 and an approaching sensor 65 .
- the sensing plate 57 and the approaching sensor 65 are disposed on corresponding portions of the lower platen 70 and the upper platen 80 , respectively.
- the upper platen 80 moves down until it contacts the port block 55 on the lower platen 70 .
- the approaching sensor 65 senses the sensing plate 57 and calculates the distance C between the approaching sensor 65 and the sensing plate 57 to determine whether the lead frame 20 is properly set on the lower mold 50 .
- the lead frame 20 is regarded as being properly set on the lower mold 50 .
- the lead frame 20 is regarded as being improperly set on the lower mold 50 .
- the conventional semiconductor chip molding apparatus has the following disadvantages.
- the lead frame 20 can be detected as being improperly set on the lower mold 50 only when the lead frame 20 is disposed on the port block 55 as shown in portion B of FIG. 1. In other words, it is impossible to determine when the lead frame 20 has been set on the locater pins 53 as shown in portion A of FIG. 1. This is because the locater pins 53 penetrate the lead frame 20 under the pressure of the upper mold 60 . As a result, the locater pins 53 seem as though they are properly inserted into side rail holes ( 850 in FIG. 3) of the lead frame 20 . Therefore, even though the lead frame 20 is improperly set on the lower mold 50 , the lead frame 20 is regarded by the sensing unit as being properly set on the lower mold 50 .
- the sensing unit can hardly detect the improper positioning of the lead frame 20 because the lead frame 20 is very thin, e.g., is only 5 mil to 10 mil thick.
- epoxy molding compound scrap produced in the previous molding process, remains on the lower mold 50 .
- the epoxy molding compound scrap affects the ability of the sensing unit to detect whether the lead frame 20 is properly set on the lower mold 20 .
- the lead frame 20 is regarded as being improperly set on the lower mold 50 when the epoxy molding compound scrap has a thickness of more than 0.3 mm.
- the conventional semiconductor chip molding apparatus is calibrated to detect epoxy molding compound scrap having a thickness of more than 0.5 mm for the purpose of preventing the epoxy molding compound scrap from producing an abnormal operation.
- the ability of the apparatus to determine whether the lead frame is properly set on the lower mold is nominal. Consequently, the manufacturing yield is poor.
- An object of the present invention is to overcome the above-described problems and limitations of the prior art. More specifically, it is one object of the present invention to provide a semiconductor chip molding apparatus that can accurately and surely detect whether a lead frame is properly set in position. It is another object of the present invention to provide an inset-molding apparatus having an improved manufacturing yield.
- the molding apparatus comprises an upper platen including an upper mold, a lower platen including a lower mold having a molding block defining at least one mold cavity; a controller that controls an operation of the semiconductor chip molding apparatus; and an electrical detector for forming an electrical circuit between the controller and the lead frame or other metal part to be inset-molded when the lead frame or metal part is oriented a certain way, i.e., improperly, on the lower mold.
- the detector includes at least one detecting block positioned adjacent the molding block so as to contact the lead frame when the lead frame is improperly set on the molding block.
- the detecting block is electrically insulated from components of the molding apparatus, including the lower mold.
- a detecting wire connects the detecting block to the controller and transfers the electrical signal to the controller.
- the detector further includes a connecting block connected to the detecting block.
- the connecting block including a conductive spring or a screw dispsoed in contact the detecting block so as to transfer an electrical signal from the detecting block to the controller.
- Another object of the present invention is to provide a method for use in operating an inset-molding apparatus, in particular, a method of operating a semiconductor chip molding apparatus, which accurately detects when a metal part such as a lead frame to be inset-molded is improperly positioned over the mold cavity.
- the method comprises: setting the lead frame or other metal part to be inset-molded on a conductive lower mold of the molding apparatus; providing at least one electrically conductive detecting block adjacent the lower mold, and electrically insulating the at least one electrically conductive block from at least the lower mold; and subsequently imparting a voltage to at least the lower mold.
- an electrical signal will flow from the detecting block when the lead frame or other metal part to be insert-molded rests on the detecting block.
- the lead frame or other metal part is determined as having, for example, been improperly set on the molding block.
- the signal generated is detected by a controller and thereby used to control the further operation of the apparatus.
- the controller interrupts the operation of the molding apparatus when the monitoring of the detecting block for an electrical signal indicates that the part to be inset-molded is mis-positioned on the molding block relative to th mold cavity.
- FIG. 1 is a cross-sectional view of a conventional semiconductor chip molding apparatus
- FIG. 2 is a schematic diagram of a semiconductor chip molding apparatus according to the present invention.
- FIG. 3 is a perspective view of a molding unit according to the present invention.
- FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3;
- FIG. 5 is a plan view of a portion of the molding unit showing a state in which a lead frame is oriented properly on the molding block;
- FIG. 6 is a similar view showing a state in which the lead frame is oriented improperly on the molding block.
- the semiconductor chip molding apparatus 900 of the present invention includes a loading portion, a molding portion, an unloading portion, and a controller 700 .
- the loading portion serves to load a lead frame onto the molding portion, and includes a lead frame supplying unit 100 for supplying a lead frame 800 (see FIG. 3), a tablet unit 200 for supplying a molding resin, such as an epoxy molding compound, in mass, and a loader unit 300 for transferring the lead frame 800 from the lead frame supplying unit 100 and the molding resin from the tablet unit 200 to the molding portion, respectively.
- a lead frame supplying unit 100 for supplying a lead frame 800 (see FIG. 3)
- a tablet unit 200 for supplying a molding resin, such as an epoxy molding compound, in mass
- a loader unit 300 for transferring the lead frame 800 from the lead frame supplying unit 100 and the molding resin from the tablet unit 200 to the molding portion, respectively.
- the molding portion includes a molding unit 400 for encapsulating the lead frame 800 in package form using the molding resin, and a driving unit (not shown) for driving the molding unit 400 meaning that it appropriately pressurizes and heats the molding resin in the molding unit 400 .
- the unloading portion includes an unloading unit 500 for unloading the packaged lead frame 800 from the molding unit 400 , and a stacking unit 600 for sequentially stacking the packaged lead frames 800 unloaded by the unloading unit 500 .
- the controller 700 controls all of the operating equipment of the semiconductor chip molding apparatus of FIG. 1, and stops the operation of the semiconductor chip molding apparatus 900 when the lead frame 800 is improperly set on the molding unit 400 as shown in FIG. 6.
- the molding unit 400 includes a lower platen 420 and an upper platen 460 .
- a lower mold 440 is secured to the lower platen 420
- an upper mold 480 opposed to the lower mold 440 is secured to the upper platen 460 .
- the lower mold 440 is made of a conductive material, and includes a port block 444 for substantially supplying the molding resin in mass, and a molding block 441 on which the lead frame 800 is set.
- the molding block 441 is located at both sides of the lower mold 440 , whereas the port block 444 runs along the central part of the lower mold 440 .
- the port block 444 includes a ram port 445 on which the molding resin is placed, and a runner 446 along which molten molding resin flows into a mold cavity 442 .
- the molding block 441 includes a plurality of the mold cavities 442 that accommodate a plurality of semiconductor chips mounted on the lead frame 800 .
- Each of the cavities 442 has a shape corresponding to that of the final package and includes a gate 443 that communicates with a runner 446 .
- the gate 443 serves as an inlet through which the molten molding resin flows into the cavity 442 .
- the molding block 441 also includes a plurality of locater pins 451 spaced along an outer edge thereof.
- the locater pins 451 are disposed at locations corresponding to side rail holes 850 of the lead frame 800 .
- the locater pins 451 are received in the corresponding side rail holes 850 of the lead frame 800 .
- the molding unit 400 also comprises lead frame detecting means operable to generate a signal that stops the operation of the semiconductor chip molding apparatus 900 when the lead frame 800 is improperly set on the molding block 441 .
- the lead frame detecting means includes a detecting block 448 that effectively senses a state of orientation of the lead frame 800 , and a connection block 447 and a detecting wire 450 (see FIG. 5) which transfer an electrical signal from the detecting block 448 to the controller 700 .
- the detecting block 448 is made of a conductive material.
- two detecting blocks 448 are oriented perpendicular to the longitudinal direction of the lower mold 440 , i.e., perpendicular to the lead frame 800 , at opposite ends of the lower mold 440 .
- the detecting block 448 is electrically insulated from the other components of the bottom half of the molding apparatus 400 , such as the lower platen 420 , the molding block 441 , and the port block 444 .
- an insulating member 449 comprising any suitable electrical insulator, isolates the detecting block 448 (see FIG. 4).
- the insulating member 449 comprises a lining of electrically insulating material interposed between the port block 444 and the detecting block 448 , between the molding block 441 and the detecting block 448 , and between the lower platen 420 and the detecting block 448 .
- the insulating member 449 can be formed unitarily with or separately from the detecting block 448 .
- the connecting block 447 is also made of a conductive material and is electrically isolated from the lower mold 440 and any component electrically conductively connected thereto.
- two such connecting blocks 447 are electrically connected to the corresponding detecting blocks 448 via a conductive connecting member 447 a such as a metal spring or a screw.
- the connecting member 447 a serves as an electrical contact that presses against the connecting block 447 when the lower mold 440 is attached to the lower platen 420 .
- the detecting wire 450 shown in FIG. 5 is electrically connected to each detecting block 448 via only a connecting block 447 , and is electrically connected to the controller 700 .
- the lead frame 800 having semiconductor chips thereon is stacked on the lead frame supplying unit 100 .
- the loading unit 300 transfers the lead frame 800 from the lead frame supplying unit 100 to the molding block 441 of the molding unit 400 .
- the loading unit 300 sets the lead frame 800 on the molding block 441 such the side rail holes 850 of the lead frame 800 receive the locater pins 451 .
- the loading unit 300 also transfers molding resin to the ram port 445 of the port block 444 .
- the port block has been previously heated such that at this moment, the port block 444 has a temperature of about 180° C. Thus, the molding resin becomes molten when it is placed on the ram port 445 .
- the driving unit exerts a predetermined driving force on the lower platen 420 or the upper platen 460 of, for example, about 3 tons.
- the lower mold 440 and the upper mold 480 are forced together under a pressure of about 120 torr.
- the driving unit pushes the molten mold resin out of the ram port 445 using a mechanical element, e.g., a piston.
- the molten molding resin flows via the runner 446 into the cavity 442 or, more specifically into the cavity formed by the confronting molding blocks of the lower mold 440 and the upper mold 480 .
- the molten molding resin remains in the cavity 442 for a predetermined time period until it is cured. Once the molding resin is cured, the semiconductor chip is encapsulated. Subsequently, the unloading unit 500 unloads the packaged lead frame 800 from the molding unit 400 and transfers it to the stacking unit 600 , whereupon the molding process is complete.
- the lead frame 800 transferred from the lead frame supplying unit 100 by the loading unit 100 is set somewhat askew on the molding block 441 , i.e., improperly, the lead frame 800 rests atop the locater pins 451 and the port block 444 . In this case, the lead frame 800 also contacts one or more of the detecting blocks 448 . Therefore, the detecting block(s) 448 is/are electrically connected to the lower mold 440 because the lead frame 800 is an electrical conductor. That is, the lead frame 800 serves as a switch for electrically connecting the lower mold 440 to the detecting block 448 .
- a voltage is applied by a voltage source V across some point on the semiconductor chip molding apparatus 900 , except at the detecting block 448 .
- This test voltage is a low voltage for the sake of safety.
- a voltage of about ⁇ 24 volts is applied to any one of several components of the semiconductor chip molding apparatus 900 that include or are otherwise in an electrical conductive relationship with the lower mold 440 . Therefore, a signal having a voltage of ⁇ 24 volts will flow into the controller 700 through the detecting block 448 and the detecting wire 450 via locater pins 451 and/or port block 444 , and lead frame 800 . Consequently, the controller 700 recognizes that the lead frame 800 is improperly set on the molding block 441 . The controller 700 thus stops the operation of the semiconductor chip molding apparatus 900 .
- the semiconductor chip molding apparatus according to the present invention can accurately detect whether the lead frame is properly set on the molding block, whereby the manufacturing yield can be improved.
Abstract
A semiconductor chip molding apparatus includes an upper platen including an upper mold, a lower platen including a lower mold having a molding block configured to receive a lead frame, a controller, and an electrical detector for forming an electrical circuit between the controller and the lead frame when the lead frame is oriented improperly on the lower mold. A low-level test voltage is imparted to at least the lower mold. As a result, an electrical signal will flow from the detecting block when the lead frame rests on the detecting block. When such a signal is detected, therefore, the lead frame is determined as having been improperly set on the molding block. The signal generated is detected by a controller and used thereby to interrupt the operation of the molding apparatus.
Description
- 1. Field of the Invention
- The present invention relates to inset-molding. More specifically, the present invention relates to a semiconductor chip molding apparatus and to a method of detecting whether a lead frame is positioned properly in the same.
- 2. Description of Related Art
- The manufacturing of semiconductor devices, known as chip packages, includes an assembly method in which chips are packaged once they have undergone an electrical die sorting (EDS) process in which individual chips having certain electrical and physical characteristics are sorted. Hence, only non-defective chips are packaged.
- The assembly method includes a die bonding process of attaching the non-defective chip on a pad of a lead frame, a wire bonding process of electrically connecting bonding pads of the chip to inner lead tip of the lead frame via connector wires, a molding process of encapsulating the chip using an epoxy molding compound so as to protect the chip, the connector wires, the inner leads, and so on, and a forming process of finalizing the form of the chip package so that the chip package may be mounted on a printed circuit board (PCB).
- The molding process is performed by a semiconductor molding apparatus. In this apparatus, an epoxy molding compound is heated and pressurized to assume a molten state. The molten compound is then injected into molding cavities to encapsulate semiconductor chips on lead frames set in position in the cavities.
- The conventional semiconductor chip molding apparatus also has a sensing unit that determines whether the lead frames are properly positioned in the apparatus before the semiconductor chips are encapsulated with the epoxy molding compound. Thus, the sensing unit attempts to ensure that the molding process is performed properly.
- FIG. 1 is a cross-sectional view of the conventional semiconductor chip molding apparatus.
- Referring to FIG. 1, the conventional semiconductor
chip molding apparatus 90 includes alower platen 70, and anupper platen 80 opposed to thelower platen 70. Alower mold 50 is integrated with thelower platen 70, and anupper mold 60 is integrated with theupper platen 80. - The
lower mold 50 includes a plurality oflocater pins 53 at the periphery thereof. Thelocater pins 53 guide alead frame 20 into position on thelower mold 50. Aport block 55 is disposed at a central portion of thelower mold 50. The molding resin, such as an epoxy molding compound, is supplied through theport block 55 after thelead frame 20 has been set on thelower mold 50. - As mentioned above, the conventional semiconductor
chip molding apparatus 90 further includes a sensing unit to determine whether the lead frame has been properly set on thelower mold 50. The sensing unit includes asensing plate 57 and an approachingsensor 65. Thesensing plate 57 and the approachingsensor 65 are disposed on corresponding portions of thelower platen 70 and theupper platen 80, respectively. - After the
lead frame 20 is set on thelower mold 50, theupper platen 80 moves down until it contacts theport block 55 on thelower platen 70. During this time, the approachingsensor 65 senses thesensing plate 57 and calculates the distance C between the approachingsensor 65 and thesensing plate 57 to determine whether thelead frame 20 is properly set on thelower mold 50. When the calculated distance C between thelower mold 50 and theupper mold 70 is equal to the thickness d of theport block 55, thelead frame 20 is regarded as being properly set on thelower mold 50. On the other hand, when the distance C between thelower mold 50 and theupper mold 70 is greater than the thickness d of theport block 55, thelead frame 20 is regarded as being improperly set on thelower mold 50. - However, the conventional semiconductor chip molding apparatus has the following disadvantages.
- First, the
lead frame 20 can be detected as being improperly set on thelower mold 50 only when thelead frame 20 is disposed on theport block 55 as shown in portion B of FIG. 1. In other words, it is impossible to determine when thelead frame 20 has been set on thelocater pins 53 as shown in portion A of FIG. 1. This is because thelocater pins 53 penetrate thelead frame 20 under the pressure of theupper mold 60. As a result, thelocater pins 53 seem as though they are properly inserted into side rail holes (850 in FIG. 3) of thelead frame 20. Therefore, even though thelead frame 20 is improperly set on thelower mold 50, thelead frame 20 is regarded by the sensing unit as being properly set on thelower mold 50. - In addition, even when the
lead frame 20 has been placed over theport block 55 as shown in portion B of FIG. 1, the sensing unit can hardly detect the improper positioning of thelead frame 20 because thelead frame 20 is very thin, e.g., is only 5 mil to 10 mil thick. - Moreover, epoxy molding compound scrap, produced in the previous molding process, remains on the
lower mold 50. The epoxy molding compound scrap affects the ability of the sensing unit to detect whether thelead frame 20 is properly set on thelower mold 20. - In the conventional semiconductor chip molding apparatus, the
lead frame 20 is regarded as being improperly set on thelower mold 50 when the epoxy molding compound scrap has a thickness of more than 0.3 mm. However, the conventional semiconductor chip molding apparatus is calibrated to detect epoxy molding compound scrap having a thickness of more than 0.5 mm for the purpose of preventing the epoxy molding compound scrap from producing an abnormal operation. Thus, the ability of the apparatus to determine whether the lead frame is properly set on the lower mold is nominal. Consequently, the manufacturing yield is poor. - An object of the present invention is to overcome the above-described problems and limitations of the prior art. More specifically, it is one object of the present invention to provide a semiconductor chip molding apparatus that can accurately and surely detect whether a lead frame is properly set in position. It is another object of the present invention to provide an inset-molding apparatus having an improved manufacturing yield.
- In order to achieve the above object, the molding apparatus comprises an upper platen including an upper mold, a lower platen including a lower mold having a molding block defining at least one mold cavity; a controller that controls an operation of the semiconductor chip molding apparatus; and an electrical detector for forming an electrical circuit between the controller and the lead frame or other metal part to be inset-molded when the lead frame or metal part is oriented a certain way, i.e., improperly, on the lower mold.
- The detector includes at least one detecting block positioned adjacent the molding block so as to contact the lead frame when the lead frame is improperly set on the molding block. The detecting block is electrically insulated from components of the molding apparatus, including the lower mold. A detecting wire connects the detecting block to the controller and transfers the electrical signal to the controller.
- The detector further includes a connecting block connected to the detecting block. The connecting block including a conductive spring or a screw dispsoed in contact the detecting block so as to transfer an electrical signal from the detecting block to the controller.
- Another object of the present invention is to provide a method for use in operating an inset-molding apparatus, in particular, a method of operating a semiconductor chip molding apparatus, which accurately detects when a metal part such as a lead frame to be inset-molded is improperly positioned over the mold cavity.
- The method comprises: setting the lead frame or other metal part to be inset-molded on a conductive lower mold of the molding apparatus; providing at least one electrically conductive detecting block adjacent the lower mold, and electrically insulating the at least one electrically conductive block from at least the lower mold; and subsequently imparting a voltage to at least the lower mold.
- As a result, an electrical signal will flow from the detecting block when the lead frame or other metal part to be insert-molded rests on the detecting block. When such a signal is detected, therefore, the lead frame or other metal part is determined as having, for example, been improperly set on the molding block. The signal generated is detected by a controller and thereby used to control the further operation of the apparatus. In particular, the controller interrupts the operation of the molding apparatus when the monitoring of the detecting block for an electrical signal indicates that the part to be inset-molded is mis-positioned on the molding block relative to th mold cavity.
- These and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments thereof made with reference to the accompanying drawings, in which like reference numerals denote like parts, and of which:
- FIG. 1 is a cross-sectional view of a conventional semiconductor chip molding apparatus;
- FIG. 2 is a schematic diagram of a semiconductor chip molding apparatus according to the present invention;
- FIG. 3 is a perspective view of a molding unit according to the present invention;
- FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3;
- FIG. 5 is a plan view of a portion of the molding unit showing a state in which a lead frame is oriented properly on the molding block; and
- FIG. 6 is a similar view showing a state in which the lead frame is oriented improperly on the molding block.
- Referring now to FIG. 2, the semiconductor
chip molding apparatus 900 of the present invention includes a loading portion, a molding portion, an unloading portion, and acontroller 700. - The loading portion serves to load a lead frame onto the molding portion, and includes a lead
frame supplying unit 100 for supplying a lead frame 800 (see FIG. 3), atablet unit 200 for supplying a molding resin, such as an epoxy molding compound, in mass, and aloader unit 300 for transferring thelead frame 800 from the leadframe supplying unit 100 and the molding resin from thetablet unit 200 to the molding portion, respectively. - The molding portion includes a
molding unit 400 for encapsulating thelead frame 800 in package form using the molding resin, and a driving unit (not shown) for driving themolding unit 400 meaning that it appropriately pressurizes and heats the molding resin in themolding unit 400. - The unloading portion includes an
unloading unit 500 for unloading the packagedlead frame 800 from themolding unit 400, and a stackingunit 600 for sequentially stacking the packaged lead frames 800 unloaded by theunloading unit 500. - The
controller 700 controls all of the operating equipment of the semiconductor chip molding apparatus of FIG. 1, and stops the operation of the semiconductorchip molding apparatus 900 when thelead frame 800 is improperly set on themolding unit 400 as shown in FIG. 6. - Referring now to FIG. 3, the
molding unit 400 includes alower platen 420 and anupper platen 460. Alower mold 440 is secured to thelower platen 420, and anupper mold 480 opposed to thelower mold 440 is secured to theupper platen 460. - The
lower mold 440 is made of a conductive material, and includes aport block 444 for substantially supplying the molding resin in mass, and amolding block 441 on which thelead frame 800 is set. Themolding block 441 is located at both sides of thelower mold 440, whereas the port block 444 runs along the central part of thelower mold 440. Theport block 444 includes aram port 445 on which the molding resin is placed, and arunner 446 along which molten molding resin flows into amold cavity 442. Themolding block 441 includes a plurality of themold cavities 442 that accommodate a plurality of semiconductor chips mounted on thelead frame 800. - Each of the
cavities 442 has a shape corresponding to that of the final package and includes agate 443 that communicates with arunner 446. Thegate 443 serves as an inlet through which the molten molding resin flows into thecavity 442. - The
molding block 441 also includes a plurality of locater pins 451 spaced along an outer edge thereof. The locater pins 451 are disposed at locations corresponding to side rail holes 850 of thelead frame 800. When thelead frame 800 is properly set on themolding block 441 as shown in FIG. 5, the locater pins 451 are received in the corresponding side rail holes 850 of thelead frame 800. - The
molding unit 400 also comprises lead frame detecting means operable to generate a signal that stops the operation of the semiconductorchip molding apparatus 900 when thelead frame 800 is improperly set on themolding block 441. The lead frame detecting means includes a detectingblock 448 that effectively senses a state of orientation of thelead frame 800, and aconnection block 447 and a detecting wire 450 (see FIG. 5) which transfer an electrical signal from the detectingblock 448 to thecontroller 700. - The detecting
block 448 is made of a conductive material. Preferably, two detectingblocks 448 are oriented perpendicular to the longitudinal direction of thelower mold 440, i.e., perpendicular to thelead frame 800, at opposite ends of thelower mold 440. The detectingblock 448 is electrically insulated from the other components of the bottom half of themolding apparatus 400, such as thelower platen 420, themolding block 441, and theport block 444. Preferably, an insulatingmember 449, comprising any suitable electrical insulator, isolates the detecting block 448 (see FIG. 4). In this case, the insulatingmember 449 comprises a lining of electrically insulating material interposed between theport block 444 and the detectingblock 448, between themolding block 441 and the detectingblock 448, and between thelower platen 420 and the detectingblock 448. The insulatingmember 449 can be formed unitarily with or separately from the detectingblock 448. - The connecting
block 447 is also made of a conductive material and is electrically isolated from thelower mold 440 and any component electrically conductively connected thereto. Preferably, two such connectingblocks 447 are electrically connected to the corresponding detectingblocks 448 via a conductive connectingmember 447 a such as a metal spring or a screw. The connectingmember 447 a serves as an electrical contact that presses against the connectingblock 447 when thelower mold 440 is attached to thelower platen 420. The detectingwire 450 shown in FIG. 5 is electrically connected to each detectingblock 448 via only a connectingblock 447, and is electrically connected to thecontroller 700. - Hereinafter, the operation of the semiconductor
chip molding apparatus 900 and a method of detecting whether the lead frame has been improperly set in position on thelower mold 440 will be described with reference to FIGS. 2 to 6. - The
lead frame 800 having semiconductor chips thereon is stacked on the leadframe supplying unit 100. Theloading unit 300 transfers thelead frame 800 from the leadframe supplying unit 100 to themolding block 441 of themolding unit 400. Theloading unit 300 sets thelead frame 800 on themolding block 441 such the side rail holes 850 of thelead frame 800 receive the locater pins 451. At the same time, theloading unit 300 also transfers molding resin to theram port 445 of theport block 444. The port block has been previously heated such that at this moment, theport block 444 has a temperature of about 180° C. Thus, the molding resin becomes molten when it is placed on theram port 445. - When the
lead frame 800 is properly set on themolding block 441, the driving unit (not shown) exerts a predetermined driving force on thelower platen 420 or theupper platen 460 of, for example, about 3 tons. As a result, thelower mold 440 and theupper mold 480 are forced together under a pressure of about 120 torr. - At this moment, the driving unit pushes the molten mold resin out of the
ram port 445 using a mechanical element, e.g., a piston. The molten molding resin flows via therunner 446 into thecavity 442 or, more specifically into the cavity formed by the confronting molding blocks of thelower mold 440 and theupper mold 480. - The molten molding resin remains in the
cavity 442 for a predetermined time period until it is cured. Once the molding resin is cured, the semiconductor chip is encapsulated. Subsequently, theunloading unit 500 unloads the packagedlead frame 800 from themolding unit 400 and transfers it to the stackingunit 600, whereupon the molding process is complete. - Now, if the
lead frame 800 transferred from the leadframe supplying unit 100 by theloading unit 100 is set somewhat askew on themolding block 441, i.e., improperly, thelead frame 800 rests atop the locater pins 451 and theport block 444. In this case, thelead frame 800 also contacts one or more of the detecting blocks 448. Therefore, the detecting block(s) 448 is/are electrically connected to thelower mold 440 because thelead frame 800 is an electrical conductor. That is, thelead frame 800 serves as a switch for electrically connecting thelower mold 440 to the detectingblock 448. - A voltage is applied by a voltage source V across some point on the semiconductor
chip molding apparatus 900, except at the detectingblock 448. This test voltage is a low voltage for the sake of safety. In particular, a voltage of about −24 volts is applied to any one of several components of the semiconductorchip molding apparatus 900 that include or are otherwise in an electrical conductive relationship with thelower mold 440. Therefore, a signal having a voltage of −24 volts will flow into thecontroller 700 through the detectingblock 448 and the detectingwire 450 via locater pins 451 and/orport block 444, andlead frame 800. Consequently, thecontroller 700 recognizes that thelead frame 800 is improperly set on themolding block 441. Thecontroller 700 thus stops the operation of the semiconductorchip molding apparatus 900. - As is clear form the description above, the semiconductor chip molding apparatus according to the present invention can accurately detect whether the lead frame is properly set on the molding block, whereby the manufacturing yield can be improved.
- Although the present invention has been particularly shown and described with reference to the preferred embodiments thereof, the form and details thereof may be changed in various ways, as will be apparent by those of ordinary skill in the art, without departing from the true spirit and scope of the invention as defined by the appended claims.
Claims (4)
1-6. (Cancelled).
7. A method for use in operating an inset-molding apparatus, comprising:
setting a metal part to be inset-molded on a lower mold of the molding apparatus, the lower mold defining at least one mold cavity;
providing at least one electrically conductive detecting block disposed adjacent said lower mold, the at least one electrically conductive block being electrically insulated from at least the lower mold;
subsequently imparting a voltage to at least one component of the apparatus, that includes the lower mold;
subsequently detecting whether an electrical signal flows from the detecting block.
8. The method of claim 7 , and further comprising determining that the metal part to be inset-molded has been positioned improperly on the lower mold when an electrical signal is detected as flowing from the detecting block.
9. The method of claim 8 , and wherein an operation of the molding apparatus is interrupted when the electrical signal is detected from the detecting block.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/866,824 US20040222567A1 (en) | 2001-08-07 | 2004-06-15 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2001-47564 | 2001-08-07 | ||
KR10-2001-0047564A KR100426812B1 (en) | 2001-08-07 | 2001-08-07 | Semiconductor molding apparatus and lead frame setting error detecting method thereof |
US10/125,402 US6776598B2 (en) | 2001-08-07 | 2002-04-19 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
US10/866,824 US20040222567A1 (en) | 2001-08-07 | 2004-06-15 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/125,402 Division US6776598B2 (en) | 2001-08-07 | 2002-04-19 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
Publications (1)
Publication Number | Publication Date |
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US20040222567A1 true US20040222567A1 (en) | 2004-11-11 |
Family
ID=19712962
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
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US10/125,402 Expired - Fee Related US6776598B2 (en) | 2001-08-07 | 2002-04-19 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
US10/866,824 Abandoned US20040222567A1 (en) | 2001-08-07 | 2004-06-15 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US10/125,402 Expired - Fee Related US6776598B2 (en) | 2001-08-07 | 2002-04-19 | Semiconductor chip molding apparatus and method of detecting when a lead frame has been improperly positioned in the same |
Country Status (3)
Country | Link |
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US (2) | US6776598B2 (en) |
JP (1) | JP4167462B2 (en) |
KR (1) | KR100426812B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1689050A1 (en) * | 2005-02-04 | 2006-08-09 | Meioukasei Co., Ltd. | Method and apparatus for terminal row insert molding |
WO2007096473A1 (en) * | 2006-02-27 | 2007-08-30 | Perlos Oyj | Method and arrangement for forming electronic device |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7927923B2 (en) | 2006-09-25 | 2011-04-19 | Micron Technology, Inc. | Method and apparatus for directing molding compound flow and resulting semiconductor device packages |
KR200461351Y1 (en) | 2008-06-25 | 2012-07-12 | 세크론 주식회사 | Mold apparatus for molding semiconductor device |
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JP2673444B2 (en) * | 1988-10-18 | 1997-11-05 | トーワ株式会社 | Lead frame set abnormality detection method and resin molding die |
JPH04373139A (en) * | 1991-06-24 | 1992-12-25 | Toshiba Corp | Detection apparatus of imperfect set of lead frame |
JPH06254896A (en) * | 1993-03-05 | 1994-09-13 | Fujitsu Miyagi Electron:Kk | Resin sealing method and device |
KR20000007753A (en) * | 1998-07-07 | 2000-02-07 | 윤종용 | Semiconductor device molding die including position arrangement pin sensor |
-
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- 2001-08-07 KR KR10-2001-0047564A patent/KR100426812B1/en not_active IP Right Cessation
-
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- 2002-04-19 US US10/125,402 patent/US6776598B2/en not_active Expired - Fee Related
- 2002-08-07 JP JP2002229864A patent/JP4167462B2/en not_active Expired - Fee Related
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2004
- 2004-06-15 US US10/866,824 patent/US20040222567A1/en not_active Abandoned
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US3617876A (en) * | 1969-09-23 | 1971-11-02 | Gen Cable Corp | Mold electrical tester for molded cords |
US4395375A (en) * | 1974-10-15 | 1983-07-26 | Electrolux Corporation | Method of electrically testing molded cord-sets during the molding operation |
US4480975A (en) * | 1981-07-01 | 1984-11-06 | Kras Corporation | Apparatus for encapsulating electronic components |
US4561219A (en) * | 1982-12-23 | 1985-12-31 | Fuji Seiki Machine Works Ltd. | Process and apparatus for finishing electronic device |
US4574474A (en) * | 1983-05-20 | 1986-03-11 | U.S. Philips Corporation | Method and apparatus for molding an electrical plug with internal protective cap |
US4973948A (en) * | 1990-01-26 | 1990-11-27 | Micron Technology, Inc. | Reversed or missing lead frame detector |
US5123823A (en) * | 1990-02-01 | 1992-06-23 | Mitsubishi Denki Kabushiki Kaisha | Molding device for sealing semiconductor element with resin |
US5328347A (en) * | 1991-09-16 | 1994-07-12 | Amco Hi-Tech B.V. | Device for introducing a plastic material into a mould cavity |
US5286426A (en) * | 1992-04-01 | 1994-02-15 | Allegro Microsystems, Inc. | Assembling a lead frame between a pair of molding cavity plates |
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EP1689050A1 (en) * | 2005-02-04 | 2006-08-09 | Meioukasei Co., Ltd. | Method and apparatus for terminal row insert molding |
WO2007096473A1 (en) * | 2006-02-27 | 2007-08-30 | Perlos Oyj | Method and arrangement for forming electronic device |
US20090014910A1 (en) * | 2006-02-27 | 2009-01-15 | Perlos Oyj | Method and arrangement for forming electronic device |
Also Published As
Publication number | Publication date |
---|---|
US20030030187A1 (en) | 2003-02-13 |
US6776598B2 (en) | 2004-08-17 |
JP2003133346A (en) | 2003-05-09 |
KR20030013203A (en) | 2003-02-14 |
KR100426812B1 (en) | 2004-04-08 |
JP4167462B2 (en) | 2008-10-15 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |