WO1996005714A1 - Procede et dispositif de verification des soudures d'une plaquette de circuit imprime - Google Patents
Procede et dispositif de verification des soudures d'une plaquette de circuit imprime Download PDFInfo
- Publication number
- WO1996005714A1 WO1996005714A1 PCT/JP1995/001569 JP9501569W WO9605714A1 WO 1996005714 A1 WO1996005714 A1 WO 1996005714A1 JP 9501569 W JP9501569 W JP 9501569W WO 9605714 A1 WO9605714 A1 WO 9605714A1
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- WO
- WIPO (PCT)
- Prior art keywords
- image
- transparent
- response
- sided
- soldering
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/302—Contactless testing
- G01R31/304—Contactless testing of printed or hybrid circuits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/12—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to investigating the properties, e.g. the weldability, of materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
- G01N23/044—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material using laminography or tomosynthesis
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/04—Mounting of components, e.g. of leadless components
- H05K13/046—Surface mounting
- H05K13/0465—Surface mounting by soldering
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/08—Monitoring manufacture of assemblages
- H05K13/082—Integration of non-optical monitoring devices, i.e. using non-optical inspection means, e.g. electrical means, mechanical means or X-rays
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/40—Semiconductor devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/36—Electric or electronic devices
- B23K2101/42—Printed circuits
Definitions
- the present invention relates to a soldering inspection method and apparatus for a mounting board on which components are mounted by soldering, and more particularly to irradiating X-rays and inspecting the quality of the soldering state from X-ray transparent images.
- soldering inspection method and 3 ⁇ 4B.
- the mounting board In the conventional method of inspecting the soldering condition of a mounting board on which components are mounted by soldering, the mounting board is irradiated with X bran, the amount of transmitted X-rays is detected, and the penetration is detected.
- S is expressed as a x-ray transmission image as a distribution of the amount of speed over different portions of the substrate.
- the shape of the solder and the solder s of the solder can be detected from the transparent surface image, and the quality of the solder can be determined. As described above, the s image can be obtained according to the x degree of the subject, and has excellent characteristics as a soldering inspection method.
- an X-ray transmission image of only one side of a mounted product that interferes with an inspection is collected and recorded in advance.
- soldering of both sides is performed by subtracting the above-mentioned useful image »that is mixed in from the image of the soldering section to be inspected. Inspection can be performed.
- the conventional method described above obtains an image on the other side by subtracting the X »transparent image projected on only one side from the X-through image on the double-sided mounting board.
- the present invention has been deemed to be IB based on the above-mentioned problems.
- a soldering inspection S method and device that can make the soldering inspection more reliable and improve the inspection accuracy by obtaining a higher sugar content X-sensitive transmission image with a BP in the actual shape, and
- An object of the present invention is to provide an image processing device g suitable for being provided in an apparatus for performing a soldering inspection method.
- the present inventors paid attention to the spatial frequency in obtaining a highly accurate X-ray transparent image.
- the response to the empty IB frequency is different if the empty R3 frequency is different, and the X-ray detector is not constant.
- the S! Frequency is low for a board with components on only one side and a board with components mounted on the other side and components on both sides. This means that X-ray penetration is detected at different responses. Therefore, due to the shadow ⁇ of the response characteristics of the X-ray detection * in the real R, the X-ray transparent image of the concept mounted on only one side from the X-ray transparent image of the board mounted on both sides is simply added to the castle. In the conventional inspection method described above, it is not possible to obtain a transmission image of only the other side so accurately that a soldering inspection can be performed.
- the gain characteristics at high wave numbers are reduced due to the transfer characteristics of the image processing system, and the response is reduced to three or more. This is because the M relationship between the density information at high spatial frequencies and the X-speed S of the subject is different from the M relationship between the density information at low spatial frequencies and the X-ray opacity of the subject. However, it is difficult to obtain a ⁇ -through image that conforms to the actual shape. Disclosure of the invention
- the present invention provides a first S-side arrangement, a one-sided soldering inspection device, and a two-sided mounted substrate transparent image reading unit. Inspection is performed by the following inspection method using an inspection device s provided with a response correction device s, a means, and a soldering inspection device S on the other side.
- the inspection method adopted by the present invention to arbitrate the above object includes a transparent image integration step of irradiating X-rays to a substrate having components mounted on only one side to obtain a transparent image on one side, Performing a soldering inspection using the one-side transmission image;
- Irradiating Xtt! On the substrate on which both surfaces are mounted to obtain a transparent image of the double-sided mounting, and the transparent image of the one-sided side and the transparent image of the double-sided mounting described above.
- a step of correcting the response so as to make the response characteristic substantially constant in a predetermined empty R8 wave number range based on the response characteristic of the image capturing system and the image processing system to the spatial frequency in the capturing step; and Subtracting the one-side transmission image corrected for the previous S response from the two-sided mounted transmission image to obtain a transmission image only on the other surface side; and And performing a soldering inspection on the mounting side.
- the response correction may be performed by correcting the ⁇ transmission image so that the gain characteristic in a predetermined sky K ⁇ wave number range becomes substantially constant.
- the one-side transmission image and the two-side mounted transmission image having different air frequencies have a uniform response characteristic within a predetermined air-ne frequency range by the above-described response correction. It is corrected to the obtained transmission image. Therefore, the effect of the X-ray detector's response characteristic (including the gain characteristic that the gain characteristic decreases at 85 minutes when the empty IH wave number is high) that the response is not constant for different open-closed wave numbers is affected.
- removing the corrected one-side transmission image from the corrected and corrected double-sided transmission image a correct other-side transmission image can be obtained, and the soldering inspection accuracy is improved.
- the soldering inspection is performed using the one-side transparent image subjected to the response correction. 14 more accurate IS inspection can be performed.
- the step of subtracting the one-sided transmission image from the two-sided real transmission image is provided in advance with information on the reference mark removed from each of the one-sided as image and the double-sided mounted transmission image. Calculating a shift amount of each of the information corresponding to the reference point on the substrate and correcting the deviation of the pixel bit position using the shift amount to align the positions of the two images.
- the displacement between the two images can be suppressed to the discard Bitch Song. For this reason, it is possible to obtain an accurate other-side perspective image rather than simply obtaining the information on the reference mark obtained from each of the two images, thereby obtaining the other-side transparent image.
- the transfer is performed. Speed is improved.
- the one-side transparent image * can be extracted at any time in accordance with the detection process of the double-sided transparent image. Is possible, and the soldering inspection on one side and the soldering inspection on the other side can be executed in parallel.
- the transmission surface image of the one side of the next board can be prepared, and the soldering inspection 5 according to the manufacturing process of the mounting board can be performed.
- a radiation source located above the planar substrate and located below the S substrate can be used.
- the radiation image is recorded on the ⁇ plate by vertically irradiating radiation onto the recording plate made of the accumulative fluorescent material »and the radiation image passing through the K substrate is recorded on the ⁇ plate.
- the ⁇ plate and the substrate are transported in a parallel horizontal plane, so that the rejection of both transporting devices g
- the radiation is irradiated downward (toward the floor), so that the operator is less likely to be exposed to radiation. If the recording plate is sucked by the vacuum suction device and circulated and conveyed in the horizontal plane of the previous S circulating conveyance, the spring of the recording plate can be extremely easily performed, and the position of the recording plate can be easily determined. Becomes
- the distance between the substrate and the plate in the image recording device can be adjusted by a. It is possible to take images ⁇ from large subjects to small subjects. In addition, bin matching is also easy.
- the image capturing means is provided with a scanning device fi for irradiating the recording plate with excitation light in the direction of transport of the recording plate, the recording plate is divided into a plurality of recording plates and images are simultaneously formed. Recording or scanning can be performed, and the running time K becomes shorter in inverse proportion to the number of the scanning devices B, and there is no problem once the scanning takes time.
- FIG. 1H is a perspective view of the degree of mounting of the image in the apparatus B for performing the substrate detection method according to one embodiment of the present invention
- FIG. FIG. 3 is a perspective view of the vacuum suction device used for the substrate fi s shown in FIG. 1 or the recording plate conveying device fi
- FIG. 3S is a diagram showing an embodiment of the present invention
- Fig. 5 is a block diagram showing the configuration of such a soldering inspection method
- Fig. 5 is a sharp illustration of the concept of pixel bit alignment between the one-side penetration image and the two-sided penetration image.
- FIG. 6 (a) is a diagram showing an example of double-sided mounting
- FIG. 6 (b) is a graph showing an example of an X-ray transmission pattern of double-sided mounting.
- Fig. 7 (a) is a diagram showing an example of one-sided mounting
- Fig. 7 (b) S is a graph showing an example of an X-ray transmission distribution of one-sided impact
- Fig. 8 (a) is ,
- Other side mounting Fig. 8 (b) shows an example of the X distribution of the transparent surface of the other side and the distribution of the X bran transmission of the difference image in which the transparent image of the one side is eliminated from the transmission image of the both sides.
- FIG. 9 is a graph showing an example of a response characteristic of the X mixing detector.
- radiographic image narrowing device 23 such as X »provided in a device for performing the method for inspecting soldering of a mounting board of the present invention will be described with reference to FIG.
- the transmission surface image acquisition device 23 based on radiation of X-rays and the like shown in the first item 2 is an X-ray generation device S 41 and a substrate ffi transport device that transports a printed substrate P in the horizontal direction indicated by an arrow X.
- 4 4 2 (the first half of the image recording & (part of the transport device B 4 2a and the second half of the transport device B 4 2b), 3 ⁇ 45 «
- Y 1, Y 2, Y 3, and Y 4 an unillustrated stimulable phosphor sheet to be transported in a horizontal plane parallel to the horizontal transport surface of the printed circuit board P is transported and hidden.
- the main components are an image recorded on the stimulable phosphor sheet S that has come and a fluorescent lamp erasing information «Kururo 48».
- the substrate transfer ⁇ 42 a and 42 b can be moved up and down in the direction of arrow Z in accordance with the size of the substrate to be inspected by the motors M 1 and M 2 respectively cast.
- Top E The focus can be adjusted by raising and lowering ⁇
- the X-ray generator 41 when the substrate is carried in below the X-ray generator 41 by the transfer device 42a, the X-ray generator 41 emits XS downward.
- the X »that has passed through the substrate P irradiates the luminescent phosphor sheet s positioned below the substrate, and stores a surface image corresponding to the substrate and its surface as soldered as the stimulable phosphor sheet. Have S record.
- the phosphor sheet S on which the image is formed is sent to the image K taking section 45 as shown by an arrow Y1.
- the details of the image capturing section 45 are as shown in FIG.
- the laser beam emitted from the laser light sensitivity section 51 crosses the paper at right angles to the plane of the paper and extends from the near side to the far side of the plane of the paper 54 as shown by the arrow in the image clearing section 45.
- the aberration is canceled through the f-lens 53 and reaches the half mirror 55.
- the needle has been thrown.
- the half mirror 55 has a transmittance of 50%, and the amount of reflected light reaching the total reflection mirror 56 a and the amount of transmitted light S reaching the total reflection mirror 56 c Is the same as
- the laser beam reflected by the total reflection mirror 56a is further reflected by the total reflection mirror 56b, and irradiates the light-transmitting phosphor sheet S which is placed on one of the plates 43. .
- the laser light transmitted through the half mirror 55 is reflected by the total reflection mirror 56c, and is emitted to the S product phosphor sheet S.
- the laser light from the total reflection mirror 56b is applied to the downstream region in the transport direction (Y1) of the S-product phosphor sheet S, and the laser light from the total reflection mirror 56c is Irradiates on the upstream side.
- the two laser beams simultaneously irradiate the stimulable phosphor sheet S.
- This has the same effect as arranging two scanning devices E that share a light beam from a common light source in the transport direction, and it takes one half the time to perform the pick-up process using only one laser beam.
- the S-type phosphor sheet S can be subjected to a pre-treatment. Also, since the light S of both laser lights is equal, there is no need for the light: a ⁇ node on the way.
- the mounting table 3 of the above-mentioned stimulable phosphor sheet S is used to securely position the stimulable phosphor sheet S and to easily attach the stimulable phosphor sheet S.
- the vacuum suction device 44 is provided on the upper surface. The details of the vacuum suction equipment 44 are shown in FIG. 3, and the mounting stage 43 is empty inside.
- the depth (running S) angle and the image capturing unit 45 of the galvanometer are obtained. Conveyed by the shooting belt 50 indicated by the arrow Y1 By detecting the amount of fluorescent light from the position B determined by S in a time-sharing manner using the stop light 57, 57, the substrate P stored in the S3 ⁇ 4 phosphor sheet S and the X A two-dimensional image corresponding to the S distribution can be detected as time-division data.
- the phosphor sheet S is sent in the direction of the arrow Y2 by the transport device B (not shown), and is illuminated with fluorescent light for erasing below the erasing device IS46 to record. to erase.
- the stored phosphor sheet S that has just been erased is further fed on the horizontal plane ⁇ as shown by arrows Y 3 and Y 4, and is circulated again to the image recording section of Shirou's X-ray generator 41.
- the stimulable phosphor sheet S can be reused without being discharged.
- a light beam scanning device is used in the gun section for integrating the image data from the S-storing phosphor-node S.
- the body sheet is placed on the mount 3 and the sensitivity of the light S according to the image data is irradiated from the two lights to the light body sheet. Please note.
- the transparent image K mounting and concealment Because the plate and the substrate are sent in a parallel horizontal plane *, the distance for carrying and hiding the two can be set to be small, and the overall size of the device can be reduced. Since the image is recorded by radiating the launch wing toward the floor, there is little danger due to radiation leakage. In addition, since the board can be moved up and down within the image recording and concealment, it is possible to support a board of a different size, and the focusing is effectively performed. Furthermore, if the low-absorptive phosphor sheet can be transported while being sucked by the vacuum suction device, there is no risk of misalignment of the sa-fluorescent sheet and the like, and it is possible to simply S. In the light beam scanning, a plurality of scanning crabs are used.
- the soldering inspection equipment B51 according to the present embodiment is mounted on the soldering inspection line as Ichiro of the board mounting line so that the soldering inspection can be performed after mounting the molded article on the board. Have been killed.
- the image data is transferred from the one-side inspection part 2, the other-side inspection part 3, and the one-side inspection part 2 to the other-side inspection part 3.
- a transmission line 4 connected between the two inspection units is provided.
- the inspector 2 on the front side is connected to the board mounting line on the front side
- the inspection unit 3 on the other side is connected to the board mounting line on the other side.
- Juro 2 is an X-based transparent image ⁇ capture B 23, response correction g 2 2, implementation missing 3 ⁇ 4 decision concealment 7, image compression g 2 4, coding concealment 2 5, memory 5, and image transmission «6.
- the other side inspection unit 3 includes an image receiver 8, a decoding device B 9, an image decompression device 10, an image switching S i 1, two memories 1 2 and 13 Image Akatori 3 ⁇ 4 Iron 1 ⁇ , Response correction 3 ⁇ 4 B 18, Destruction 1 B 20, Reference point meter SE device B 19, Off S »l 4, Response correction device 15, Point needle calculation A device S 16 and a mounting defect determination device 21 are provided.
- the above-mentioned X-bran penetration images B23 and B17 can be used to detect the distribution of X-sensitivity of soldering to be inspected from the X-blow images as shown in Fig. 1.
- the shape of the solder and the solder S can be determined, and the quality of the soldering can be inspected.
- the method for inspecting soldering of a mounting board of the present invention is performed as follows.
- the Xffi penetration image obtained by the above X »penetration image ⁇ mounting g23 The Xffi penetration image in the high air frequency part is reduced by the effect of the response characteristic, so the X bran transmission image conforming to the actual shape There is a problem that can not be obtained accurately. Therefore, the X »transparent image is corrected by the response correction unit B22 so as to correspond to the response characteristic, and an image is obtained in which the gain characteristic around the predetermined air cabinet frequency E is constant. Using the response-corrected image, a soldering inspection is performed by the mounting defect determination device 7 using the X-sensitive transmittance distribution as described above.
- the board that has been mounted on one side is subjected to a soldering inspection by the image K taking device 23, the response correcting device 22 and the mounting defect judging device fi7. If the board to be inspected is single-sided, the soldering inspection ends at this point.
- the soldering inspection on one side of the board is performed as described above, while the X-ray on one side of the board obtained by the through image
- the transmitted image is subjected to image compression by the image compression device B 24, encoded by the encoding device g 25, stored in the memory 5, and transmitted to the memory 5 via the transmission line 4 from the image transmission «6. Send to face side inspection 3.
- the transferred image is received by the image receiver 8, and »is output by the decoding device S9, and the one-side transmission: ft image is reproduced by the image expansion device S10.
- This image is stored in the two memories 12 and 13 by the switching port 11 while being appropriately switched.
- This transmitted image is compressed and encoded so that it can be transferred (with reduced ffi). It is feasible to respond to the speed of the board mounting process. For this reason, it is possible to carry out the board mounting process and soldering inspection on-line.
- the memories 1 2 and 1 3 can temporarily transfer the transferred one-side transparent * surface «temporarily and then take out the one-side ⁇ image according to the flow of the board mounting process and execute the processing In addition, it is possible to prepare and wait for the following one-sided side image to be processed and extracted for the soldering inspection image processing.
- the X-ray transmission image « is collected by the X-ray transmission image ⁇ mounting and concealment 17 of the inspector 3 on the other side, and the response is corrected.
- the gain is corrected by the device S18 so that the gain characteristic in a predetermined spatial frequency range becomes constant.
- the response-corrected image desire is input to the reference device S 20 and also to the reference point needle calculation device gl 19.
- the above-mentioned reference point calculation and concealment 16 and 19 are the reference point mark position information obtained from the one-side transmission image and the two-sided transmission image and the reference point of the substrate given in advance. Calculate the deviation from the B coast information and input it to the equipment S 20.
- Supremacy S Souita 20 is a reference point mark that is removed from the two-sided mounted image. Based on the deviation between the image and a predetermined reference point, the deviation of one pixel or less of each image is calculated by interpolation. Accordingly, the response-corrected double-sided mounted transmission image is aligned with the response-corrected single-sided transmission image. Then, a difference image between the two images is obtained, and a transparent surface image only on the other surface side is obtained. Using the transparent image on the other side, a soldering inspection on the other side is performed by the mounting missing BS determination unit S21.
- the position IB adjustment as described above is performed to obtain a difference image between the through image on one side and the see-through image on both sides, and the pixel bite Enables alignment with unprecedented precision.
- the X transparent image decomposes the analog signal detected by the X? Detector or the like at a predetermined time by fflMPi using the AZD converter. At this time, the pain corresponds to the pixel bitch of the image. Therefore, when calculating the difference image, if it is divided without performing the IB adjustment of the accuracy of the non-pixel pitch of the droplet, the resulting image will have a difference due to a shift of one pixel, which will lead to the flag judgment in the soldering inspection. It becomes a factor. Therefore, in the present embodiment, by eliminating the light level (the X-ray transmission level) of the pixel at the desired position B in two dimensions, the model determination factor is eliminated.
- a two-dimensional matrix Y a [j, k] representing the gray level of an image is given.
- j is in the range from 1 to m
- k is a natural number in the bran range from 1 to n.
- an array X 1 a of length m and an E column X 2 a of length II are also given. From these figures, the value of the port level can be expressed by the following equation (1).
- Y a C j. K] y (x 1 a C j), x 2 a Ck]) ⁇ .. (1)
- Y a is the gray level value separated from the plane and y is the continuous «Light level use of S.
- three mX n picks including the point (xl. X 2) for obtaining the supplementary Iffl value are obtained, and a one-dimensional Complementation ffl is performed, and then one-dimensional simplification can be performed using n pixels in the X1 direction.
- polynomial simplification such as Lagrange's formula, interpolation using rational bright numbers, and complement H using spline 58 numbers can be used.
- the one-side transmission image and both-side transmission image input to the subtraction unit 20 are as follows. As described above, each of the images is a response-corrected image.
- the response correction is performed by digitally converting the X-ray transmission image based on the analog signal detected by the X-ray detector, obtaining the sky IBffl wave number component from this digital surface image, and determining a predetermined predetermined simplified frequency e.
- a correction coefficient that corrects the response characteristics in a box so that the response characteristics become substantially constant
- the image is corrected so that the response characteristics are constant at a predetermined air-closed frequency and range. This is the process to be performed.
- the above-mentioned correction coefficient is determined by obtaining digital images from various subjects having a unique spatial frequency, and obtaining a correction coefficient such that the response for each of the sky K frequencies is constant. be able to.
- the predetermined sky BJB wave number range is, for example, a range in which the sky leap frequency of the transmission image on one side and the transmission image mounted on both sides is different.
- FIG. 6 (a) shows a solder chip 27 attached to a soldering land 28a formed on one side 26a of the substrate 26 by soldering, and another side 26
- FIG. 6 (b) shows the g-light repelle showing the X-ray transmission amount distribution of the double-sided projecting board 35 mounted with the leads 33 of the parts attached to b overlapping each other.
- FIG. 7 (a) shows the shading level of the one-sided mounting board 36 before this double-sided mounting.
- FIG. 8 (b) shows a case where the two X »transmission s distributions have no response correction and a case where there is a response correction. Further, Fig.
- FIG. 8 (b) shows the X-transmitted S distribution obtained by correcting the response of the X »radiographic image, as shown in Fig. 8 (a), as the ratio K data. Show I have.
- the X-Toru * image with the concept implemented only on the other side is not obtained by the inspection of Yomi, but how is the difference between the response-corrected through-side image and the double-sided actual image different? This is to investigate whether or not it can be approximated to the other-side transparent surface of the ideal state.
- the eighth S (b) it can be seen that the difference image after the response correction is close to the other-side transparent image of the ideal situation.
- the difference between the transmissive surface image on the other side and the ideal surface image by the difference image without response correction is 3.8% on average and 12.1% at maximum, and the response must be corrected.
- the average is 1.2 96
- the ft is 4.096.
- the present invention has the following effects.
- the response characteristics with respect to the simplified frequency between the transparent image on one side having a different simplified frequency and the transparent image mounted on both sides can be aligned within a predetermined blank M frequency range, so that the other side can be accurately determined. Transmission images can be extracted, and inspection accuracy can be improved.
- the KB is calculated and aligned, so that the more accurate other-side transparent image is obtained. Images can be extracted.
- the transfer speed is improved by compressing, encoding, and transmitting the transparent image on one side. I do.
- One-side toru transferred! Images are stored in the th tt number of image notation means, It is conveniently extracted according to the process required to detect the three-surface mounted transparent image, and is eliminated from the two-side mounted transparent image.
- the soldering inspection for the one-sided mounting and the soldering inspection for the other-sided mounting can be performed in parallel, and at the same time, the one-side transparent image of the next g-plate is prepared during the inspection of one board It is possible to carry out soldering inspection according to the actual manufacturing process of the board.
- the present invention is the best soldering inspection method and apparatus B which can obtain a more accurate X-ray transmission image according to the actual shape of the board, thereby making the soldering inspection more reliable and improving the inspection accuracy. It is.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/776,651 US5836504A (en) | 1994-08-08 | 1995-08-08 | Method and apparatus for soldering inspection of a surface mounted circuit board |
EP95927985A EP0776151A4 (en) | 1994-08-08 | 1995-08-08 | METHOD AND DEVICE FOR SOLDERING TESTING A CIRCUIT BOARD |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6/186002 | 1994-08-08 | ||
JP6186002A JPH0851276A (ja) | 1994-08-08 | 1994-08-08 | 実装基板の半田付け検査方法及び装置 |
JP6187075A JP2790778B2 (ja) | 1994-08-09 | 1994-08-09 | 放射線画像記録読取検査装置 |
JP6/187075 | 1994-08-09 |
Publications (1)
Publication Number | Publication Date |
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WO1996005714A1 true WO1996005714A1 (fr) | 1996-02-22 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP1995/001569 WO1996005714A1 (fr) | 1994-08-08 | 1995-08-08 | Procede et dispositif de verification des soudures d'une plaquette de circuit imprime |
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Country | Link |
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US (1) | US5836504A (ja) |
EP (1) | EP0776151A4 (ja) |
WO (1) | WO1996005714A1 (ja) |
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US6360935B1 (en) * | 1999-01-26 | 2002-03-26 | Board Of Regents Of The University Of Texas System | Apparatus and method for assessing solderability |
JP4043158B2 (ja) * | 1999-09-30 | 2008-02-06 | 松下電器産業株式会社 | リフロー半田付け装置 |
JP3629397B2 (ja) * | 2000-03-28 | 2005-03-16 | 松下電器産業株式会社 | 接合検査装置及び方法、並びに接合検査方法を実行させるプログラムを記録した記録媒体 |
KR20020084974A (ko) * | 2001-05-03 | 2002-11-16 | 삼성전자 주식회사 | 3차원 납땜검사장치 및 그 제어방법 |
JP3972941B2 (ja) | 2004-06-30 | 2007-09-05 | オムロン株式会社 | 部品実装基板用のはんだ印刷検査方法およびはんだ印刷検査用の検査機 |
DE102004063488A1 (de) * | 2004-12-21 | 2006-12-07 | Ersa Gmbh | Anlage zur automatischen Erkennung und Behebung von Lötfehlern an mit elektronischen Bauteilen bestückten Leiterplatten |
DE102005054775A1 (de) * | 2005-11-15 | 2007-05-16 | Matrix Technologies Gmbh | Röntgenprüfvorrichtung |
DE102005054979A1 (de) * | 2005-11-16 | 2007-05-31 | Matrix Technologies Gmbh | Röntgenprüfverfahren und Röntgenprüfvorrichtung |
JP5912553B2 (ja) * | 2012-01-12 | 2016-04-27 | ヤマハ発動機株式会社 | プリント基板の複合検査装置 |
JP5912552B2 (ja) * | 2012-01-12 | 2016-04-27 | ヤマハ発動機株式会社 | X線検査装置 |
EP3315903B1 (en) * | 2015-06-24 | 2019-12-18 | FUJI Corporation | Board inspection apparatus |
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JPH05110244A (ja) * | 1991-10-17 | 1993-04-30 | Matsushita Electric Ind Co Ltd | X線による半田付状態の検査方法 |
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JPS54143290A (en) * | 1978-04-28 | 1979-11-08 | Toshiba Corp | Soldered part inspecting device |
JPS6195337A (ja) * | 1984-10-16 | 1986-05-14 | Fuji Photo Film Co Ltd | 放射線画像情報記録読取装置 |
US5561696A (en) * | 1987-10-30 | 1996-10-01 | Hewlett-Packard Company | Method and apparatus for inspecting electrical connections |
US5097492A (en) * | 1987-10-30 | 1992-03-17 | Four Pi Systems Corporation | Automated laminography system for inspection of electronics |
JPH02247637A (ja) * | 1989-03-20 | 1990-10-03 | Fujitsu Ltd | 放射線画像読み取り装置 |
DE69020443T2 (de) * | 1989-07-14 | 1995-11-30 | Hitachi Ltd | Verfahren und Vorrichtung zur Untersuchung von Lötstellen mittels eines röntgenfluoroskopischen Bildes. |
JPH0372249A (ja) * | 1989-08-14 | 1991-03-27 | Fujitsu Ltd | X線半田付検査装置 |
JPH03265841A (ja) * | 1990-03-15 | 1991-11-26 | Fujitsu Ltd | 放射線画像撮影装置 |
US5012502A (en) * | 1990-06-18 | 1991-04-30 | Irt Corporation | Method for determining degree of interconnection of solder joints using X-ray inspection |
JPH04283740A (ja) * | 1991-03-13 | 1992-10-08 | Fujitsu Ltd | X線画像変換装置 |
JPH04330761A (ja) * | 1991-03-19 | 1992-11-18 | Fujitsu Ltd | 電子装置の検査方法及び装置 |
JP3092828B2 (ja) * | 1992-04-30 | 2000-09-25 | 株式会社日立製作所 | X線透過像検出によるはんだ付け検査方法とその装置 |
CA2113752C (en) * | 1994-01-19 | 1999-03-02 | Stephen Michael Rooks | Inspection system for cross-sectional imaging |
-
1995
- 1995-08-08 EP EP95927985A patent/EP0776151A4/en not_active Withdrawn
- 1995-08-08 WO PCT/JP1995/001569 patent/WO1996005714A1/ja not_active Application Discontinuation
- 1995-08-08 US US08/776,651 patent/US5836504A/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05110244A (ja) * | 1991-10-17 | 1993-04-30 | Matsushita Electric Ind Co Ltd | X線による半田付状態の検査方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0776151A1 (en) | 1997-05-28 |
EP0776151A4 (en) | 1999-08-11 |
US5836504A (en) | 1998-11-17 |
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