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Publication numberUS3701185 A
Publication typeGrant
Publication dateOct 31, 1972
Filing dateJan 18, 1971
Priority dateJan 18, 1971
Also published asCA950965A1, DE2201110A1, DE2201110B2
Publication numberUS 3701185 A, US 3701185A, US-A-3701185, US3701185 A, US3701185A
InventorsRenssen Marinus Van
Original AssigneeRca Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Method of assembling a mask with a frame assembly for mounting in a cathode-ray tube using a remote assembly position
US 3701185 A
Abstract
The method includes locating three frame-positioning points on a faceplate panel and measuring the panel contour at at least four spaced points on a circle of given radius at a first spacing with respect to the frame-positioning points. Then, at a remote location, (a) a frame assembly is oriented on three reconstructed frame-positioning points which are in substantially the same geometric relationship with respect to one another as are the frame-positioning points on the faceplate panel, (b) signals are generated related to the position of the measured contour of the panel, and (c) the signals are utilized to position four mask supports in substantially the same geometric relationship with respect to one another as are the measured contour points but at a second spacing with respect to the reconstructed frame-positioning points. Then, the contour of the mask is conformed to the contour established by the mask supports. With the mask conformed to the contour of the mask supports, the mask is permanently attached to the frame.
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United States Patent Renssen 51 Oct. 31, 1972 [54] METHOD OF ASSEMBLING A MASK [57] ABSTRACT WITH A FRAME ASSEMBLY FOR The method includes locating three frame-positioning MOUNTING IN A CATHODE'RAY points on a faceplate panel and measuring the panel TUBE USING A REMOTE ASSEMBLY contour at at least four spaced points on a circle of POSITION given radius at a first spacing with respect to the [72] Inventor; Mal-inns v Renssen, Lane'aster, frame-positioning points. Then, at a remote location,

p (a) a frame assembly is oriented on three reconstructed frame-positioning points which are in sub- [73] Asslgnee: RCA Corponmon stantially the same geometric relationship with respect 2 Filed; Jam 13, 1971 to one another as are the frame-positioning points on the faceplate panel, (b) signals are generated related Appl' 107,053 to the position of the measured contour of the panel, and (c) the signals are utilized to position four mask [52] us. 01 ..29/2s.1s, 29/2513 pp in substantially the Same geemetrie relation- [51 Int. Cl. ..H01j 9/18, H01 j 9/36 p with respect to one another as are the measured [58] Field at Search ..29/25.1, 25.11, 25.13, 25.15; contour points but at a second Spacing with respect to 73/375 the reconstructed frame-positioning points. Then, the contour of the mask is conformed to the contour [56] References Cited established by the mask supports. With the mask conformed to the contour of the mask supports, the mask UNITED STATES PATENTS is permanently attached to the frame.

MOI'rell A particular embodiment of the method also includes Albertson et a]. measuring the contour of the faceplate pane] ubstan- 3,482,286 12/ 1969 F asssett et al. 29/25.13 tiahy at the center f the panel, measuring the contour 3,537,159 1 1/ 1970 Gartner et a1 "29/2515 X of the mask substantially at the center of the mask and 3,537,161 1 H1970 Kautz ..29/25.l5 adjusting the second Spacing to obtain a desired center 3,564,195 2/1971 Ploog ..29l25.l5 Spacing between the mask and panel when the mask is I mounted in the panel while maintaining the mask con- Examme' R bert Baldwm formed to the contour established by the mask sup- Assistant Examiner-Richard Bernard Lazarus ports. Attorney-Glenn H. Bruestle 2 Claims, 5 Drawing Figures i. m i k 12h.

32 Z7e /'Z7d Z8 33& 4/ if 40 mummmfinmnmu METHOD OF ASSEMBLING A MASK WITH A FRAME ASSEMBLY FOR MOUNTING IN A CATHODE-RAY TUBE USING A REMOTE ASSEMBLY POSITION BACKGROUND OF THE INVENTION This invention relates to a method of assembling a shadow mask with a frame assembly for mounting in a cathode-ray tube and particularly in a rectangular color-television picture tube using a remote assembly position.

Commercial rectangular shadow-mask-type picture tubes for color-television receivers include a curved faceplate panel having, on its inner surface, a mosaic viewing screen of differently emissive phosphor dots and an electron gun structure to project plural electron beams towards the screen. A domed shadow mask is nested in the faceplate panel with a prescribed spacing from center to edge such as described in US. Pat. No. 3,109,116 to D. W. Epstein et al. In the operation of the tube, the electron beams pass through apertures in the mask to selectively excite the phosphor dots.

In one commercial method for assembling a rectangular shaped shadow mask with a frame assembly prior to mounting in a cathode-ray tube panel, a plurality of spacers is positioned to contact the inner contour of the panel, a frame with a mask loosely fitted thereon is located in the panel on frame-positioning means with the mask in plural contact with the spacers. Pressure is applied to seat the mask against the spacers to conform the mask contour more closely to that of the panel. Then, with the pressure still applied, the mask is attached to the frame at a plurality of separated perimetric areas. Then, the pressure is removed, and the spacers are removed. A disadvantage of this method is that the frame assembly must be directly oriented in the panel since mechanical spacers must contact the panel and the mask. This necessitates the assembly of all components by a single operator and required all the processing equipment he compacted into a limited working space. In addition, the mechanical spacers are of a fixed length. This necessitates that a predetermined spacing between the panel and mask be used since the fixed-length spacers do not permit optimized matching of mask and panel contours. The use of fixedlength spacers in which the mask is pressed into contact with the spacers also presses the spacers against the panel. This may cause scuffs or scratches in the glass panel.

Also the direct orientation of mask and panel with the mask-frame assembly positioned within the panel and oriented on frame-positioning means provides a limited amount of space between the inside of the panel sidewall and the attachment points of the mask to the frame, resulting in the necessity for specialized welding equipment. Welding the mask to the frame in the panel also may cause weld splash, which may damage the panel.

In another form of the commercial method, the mask and frame assembly are positioned one above the other with long spacers between the mask and the panel. Mechanical linkage is used to relate the frame-positioning means to its actual position when oriented in the panel. In addition to the foregoing disadvantages, the use of mechanical linkage may result in decreased accuracy in assembling the mask to the frame.

In a more specific form of each of the commercial methods previously described, the spacers are positioned between the mask and the panel near the corners and at the center of the panel. After the mask is attached to the frame and the pressure is removed, the mask may maintain the conformed shape near the corners since it is attached near the corners, but it may not maintain the conformed shape near the center where the domed shape of the mask may have a tendency to spring back to its former shape. Therefore the use of fixed spacers may not result in a desired custom-spaced mask-panel assembly. In addition, provisions are not included to optimize the spacing between the center and the corners of the panel or to select a specific spacing at the center of the panel which may be desirable to utilize all masks and panels provided.

SUMMARY OF THE INVENTION The novel method includes locating three framepositioning points on a faceplate panel and measuring the panel contour at at least four spaced points on a circle of given radius at a first spacing with respect to the frame-positioning points. Then, at a remote location, (a) orienting a frame assembly on three reconstructed frame-positioning points in substantially the same geometric relationship with respect to one another as the frame-positioning points on the faceplate panel, (b) a signal is generated related to the position of the measured contour of the panel, and (c) the signal is utilized to position four mask supports in substantially the same geometric relationship with respect to one another as the measured contour points but at a second spacing with respect to the reconstructed frame-positioning points. Then, the contour of the mask is conformed to the contour established by the mask supports and the mask is permanently attached to the frame while the mask is conformed to the contour of the mask supports.

Unlike the prior methods, the novel method permits custom assembly of a mask and frame in a position displaced from the panel without the use of mechanical spacers between the panel and the mask. This permits orienting the panel and measuring the panel contour in a first position, and then assembling a mask and frame, custom tailored to that panel, in a second position remote and at any desired distance from the first position. Also, since mechanical linkage is not used between the first and second position, it is not necessary to maintain any direct orientation between these positions. The elimination of the mechanical linkage permits remote assembly of the mask-frame assembly and provides for increased accuracy between the assembly and measured positions. Since the novel method does not press spacers against the panel and instead uses a nontouch sensing means to measure the contour of the panel, scratching of the glass panel is substantially reduced. Remote assembly of the mask and frame also permits easier and more economical attachment of the mask to the frame and eliminates weld splashing into the panel. Specialized welding equipment to fit into the limited space between the panel sidewall and the mask is not necessary, resulting in further economy.

A more specific form of the novel method includes also measuring the contour of the panel substantially at the center of the panel, measuring the contour of the mask substantially at the center of the mask and adjusting the second spacing to obtain a desired center spacing between the mask and the inner surface of the panel when the mask is mounted on the panel and conformed to the contour established by the mask supports.

This form of the novel method may be used to provide an optimum spacing between the mask and the panel for masks which cannot be sufficiently distorted to conform to an exact spacing. This results in an economy in the use of masks and panels which may not otherwise be utilized. In addition, this method provides for setting any desired spacing between the mask and the panel at the center of the panel to include setting an exact center spacing. This results in a more uniform viewed image in the finished tube.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a color-television-picturetube panel assembly illustrating the preferred points for measurement of spacing.

FIG. 2 is a sectional view of the panel assembly of FIG. 1, on section line 22, illustrating the spacing between the faceplate and the masking member.

FIG. 3 is a partial sectional view illustrating a first station of an apparatus for practicing the novel method, showing the panel on section line 3-3.

FIG. 4 is a partial sectional view illustrating a second station of an apparatus for practicing the novel method, showing the frame assembly on section line 4-4.

FIG. 5 is a plan view of a color-television-picturetube panel assembly illustrating additional or alternate points for measurement of spacing.

DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1 and 2 illustrate a panel assembly including a panel 11 and a mask assembly 12 for a rectangular color-television picture tube. The panel 11 includes a faceplate 13 and a sidewall 14 having four studs 15a through 15d extending therefrom. The mask assembly 12 includes a mask 16 having a perimetric skirt 17 and a frame assembly 18. The frame assembly 18 comprises a frame 19 having a vertically upstanding flange 20 parallel to the skirt 17, four hook plates 21a through 21d attached to the frame 19, and four leaf springs 22a through 22d each attached at one end to one of the hook plates 21a through 21d, and each having a hole 23a through 23d at the other end for detachably engaging one of the studs 15a through 15d.

The apparatus for practicing the novel method includes a first station 24 partially shown in FIG. 3 and a second station 25 partially shown in FIG. 4. The first station 24 includes three stud support member 26a through 260 (only one of which is shown) and five faceplate-measuring units 27a through 27e (only three of which are shown) mounted on a first station frame 28. Two of the stud-support members 26a and 26b (only one of which is shown in FIG. 3) are positioned in alignment for movement in the direction of the major axis of the panel 11, and one stud-support member 260 (not shown) is positioned for movement perpendicular to the direction of the two stud-support members 26a and 26b, in the direction of the minor axis of the panel 11. The three stud-support members 26a through 260 have dummy holes 29a through 290 therein to engage three studs 15a through 15c respectively (shown in FIG. 1). The dummy holes 29a through 29c when engaged with the three studs 15a through define a first reference plane 30 passing through the longitudinal axes of all three studs 15a through 15c.

Each faceplate-measuring unit 27a through 27e (only three of which are shown in FIG. 3) comprises a housing 31, a lead screw 32 rotatably mounted in the housing 31 in bearings 33a and 33b, a ball-bearing nut 34 engaging the lead screw 32, a guide member 35 attached to the nut 34 supported only for axial movement in the housing 31, a sensor-support member 36 attached to the guide member 35, a sensing unit 37a through 37e (only three of which are shown in FIG. 3) mounted on the sensor support member 36, and a drive means 38 for rotating the lead screw 32. The sensing units 37a through 37e are of the proximity-detector type. Since this type sensing unit measures the position of the faceplate without contact, a spacing E exists between the end of each of the sensing units 37a through 37e and the inner surface of the faceplate 13. The drive means 38 includes drive motor 39 with motor shaft 40, a drive gear 41 mounted on the motor shaft 40, and a driven gear 42 mounted on one end of the lead screw 32.

The second station 25 shown in FIG. 4 includes three leaf-spring-support member 43a through 430 (only one of which is shown in FIG. 4), four mask-positioning units 44a through 44d (only two of which are shown in FIG. 4) and one mask-measuring unit 45 mounted on a second station frame 46. The three leaf-spring-support members 43a through 43c are slidably mounted on the second station frame 46 to correspond to the positioning of the three stud-support members 26a through 260 in the first station 24. The three leaf-spring-support members 43a through 43c are formed with dummy studs 47a through 470 to engage the holes 23a through 23c respectively (shown in FIG. 1) in the leaf springs 22'a through 220 (shown in FIG. 1) corresponding in orientation to the position of the three studs 15a through 150 in the first station 24. The dummy studs 47a through 47c of the three leaf-spring-support members 43a through 430 when engaged with the three leaf springs 22a through 220 (shown in FIG. 1) define a second reference plane 48 passing through the longitudinal axes of all three holes 23a through 23c (only one of which is shown in FIG. 4) corresponding to the position of the three studs 15a through 15c in the first station 24. The second reference plane 48 in the second station 25 is simulative of and correspond to the first reference plane 30 in the first station 24.

The four mask-positioning units 44a through 44d (only two of which are shown in FIG. 4) are similar to the five faceplate-measuring units 27a through 27e except the sensor-support member 36 and the sensing units 37a through 37e are replaced with mask-support pins 49a through 49d (only two of which are shown in FIG. 4) which substantially conform to the inside contour of the mask 16 at the points to be measured. It is preferred that the ends of each of the mask-support pins 49a through 49d are approximately one-half inch in diameter to provide a support surface of sufficient area to prevent denting of the mask 16, and to average a contour surface area on the mask 16 for use as a measurement reference. The mask-measuring unit 45 is similar to the faceplate-measuring unit 27e and includes maskesensing unit 50, which is similar to faceplate-sensing unit 37e. Since the mask-sensing unit 50 is also a proximity-detector type, 2 spacing E exists between the end of the sensing unit 50 and e nner surfaszeofthemask 6.-

The second station 25 also includes welding means (not shown) for attaching the skirt 17 of the mask 16 to the vertical flange on the flame 19, comprising a portable or hand-carried welding unit such as an electric resistance spot welder. One faceplate-measuring unit 27e and one mask-measuring unit 45 are positioned substantially at the center point 51 of the panel 11. Four faceplate-measuring units 27a through 27d and four mask-positioning units 4411 through 44d respectively are positioned parallel to the axis of the tube at an equal radial distance from the center point 51 along the diagonal lines connecting opposite corners of the panel 11 and near each of the four corners of the I panel 11 at points 52a through 52d as shown in FIG. 1. The points 52a through 52d are bisymmetrical with the center point 51. For example, in a VABP22 colortelevision picture tube, each of the four corners points 52a through 52d is on a corner diagonal line at an 8.602-inch radius from the center point 51 of the panel 11.

The center point 51 (shown in FIG. 1) of the panel 11 is established by definition to be the intersection of a major axis plane established by the two studs 15a and 15b (shown in FIG. 1) respectively and a minor axis plane perpendicular to the major axis plane established by one stud 15c (shown in FIG. I). Also by definition, the term bisymmetrical as used herein means the panel 11, faceplate 13, and mask 16 are divisible into two mirror-image halves by either of the two above-- mentioned intersecting minor and major axis planes passing through the center point 51 of the panel 11.

The first station 24 and the second station 25 are positioned remote from each other and connected by electrical controls (not shown). The drive motors 39 of each faceplate-measuring unit 27a through 27e and each correspondingly oriented mask-positioning unit 44a through 44d and mask-measuring unit 45 are electrically connected for synchronized operation. Therefore signals from the drive motors 39 in the first station 24 relating to the position of the sensing units 37a through 372 are utilized to operate the drive motors 39 in the second station 25 to position the four mask-support pins 49a through 49d in substantially the same geometric relationship as the measured points 52a through 52d.

In the operation of the first station 24 shown in FIG. 3, a panel 11 is positioned with two exterior reference pads (not shown) on the panel facing the operator. Then three frame-positioning points comprising the three studs 15a through 150 are located on the panel 5 11. The three studs 15a through 150 are located by engagement with the dummy holes 29a through 29c in the three stud-support members 26a through 26c (only one of which is shown in FIG. 3) to define the first reference plane 30. It is preferred to use only three dummy holes 29a through 290 to engage three panel studs 15a through 150 respectively in the first station 24 to establish the first reference plane 30 since this substantially results in establishment of the same first of the number of times the panel 11 replaced on the apparatus.

The panel contour is then measured at the four points 52a through 52d at a first spacing between the first reference plane 30 defined by the three framepositioning points and the inner surface of the panel 11. The first spacing between the inner surface of the panel 11 and the first reference plane 30 at the diagonal points 520 through 52d is designated spacing B .(shQwain J The panel contour is measured by operating each faceplate-sensing unit 37a through 37e. In the operation of each faceplate-sensing unit 37a through 37e the drive motor 39 rotates the lead screw 32 through drive gear 41 and driven gear 42 to move the guide member 35, sensor-support member 36 and faceplate-sensing units 37a through 37e towards the inner surface of the panel 11. When each of the faceplate-sensing units 37a through 37e is within a predetermined spacing E, from the panel 11 inner surface, it senses this surface, and a control circuit stops the drive motor 39 within approximately 0.001 inch from the actual position of the inner surface of the panel 11. The measurement is complete when each of the five faceplate-sensing units 37a through 37e is in proper measurement positions with the inner surface of the panel 11, and each of the drive motors 39 is stopped. Signals are generated from the drive motors 39 which relate to the measured contour of the panel 11 at the points 52a through 52d and the 29m P9i t In the operation of the second station 25 shown in FIG. 4, a frame assembly 18 (shown in FIG. 1) is preassembled with four hook plates 21a through 21d (1 four is removed and 5 leaf springs 22a through 22d using the four studs 15a through (shown in FIG. 1) of a particular panel 11 as a fixture in a well known manner. Once the frame assembly 18 is preassembled and identified with a particular panel 11, they are matched work pieces for all further processing including the novel method herein aq ibsd The preassembled frame assembly 18 is oriented on three frame-positioning points in substantially the same geometric relationship to one another as the panelpositioning points. The three frame-positioning points comprise three dummy studs 47a through 47c which engage the holes 23a through 23c in the three leaf spring support members 43a through 43c (only one of which is shown in FIG. 4) to define the second reference plane 48. The first reference plane 30 (FIG. 3) and the second reference plane 48 (FIG. 4) are intended to be coincident and simulative of the plane (not shown) of the three studs 15a through 15c of an assembled panel 11 where the panel 11 and the frame assembly 18 are matched and the matched orientation is maintained during all subsequent processing steps as ,PI Y .Y .d .b

Then, the signals related to the measured contour of the panel 11 at the points 52a through 52d in the first station 24 are utilized to position four mask-support pins 49a through 49d in substantially the same geometric relationship with respect to one another as the measured contour of the panel 11 at four measured points 52a through 52d respectively at a second spacing from the second reference plane 48 as defined by the three frame-positioning points on the studs 15a through 150 reference plane 30 for a particular panel 11 regardless respectively.

The second spacing between the ends of the four mask-support pins 49a through 49d in contact with the mask 16 and the second reference plane 48 is designated spacing D (shown in FIG. 4). The spacing D is established so that the desired spacing q is obtained with the mask assembly 12 assembled in the matching panel 11. The measured spacing qis obtained from the formula:

where qis the measured spacing parallel to the axis of the tube and t is the thickness of the mask 16. The actual spacing q is then calculated from the measured spacing a and electrical and geometrical parameters of the tube in a well known manner. The actual spacing q is defined herein to be the distance between the inner surface of the panel 11 and mask 16 measured normal to the inner surface of the panel 11.

The shadow mask 16 is temporarily supported in the second station 25 with the skirt l7 overlapping the vertical flange on the frame 19 supported by the four mask-support pins 49a through 49d. The mask 16 is then flexed or slightly distorted to conform the contour of the mask 16 to the contour established by the support pins 49a through 49d. A clamping means (not shown) is used to maintain the mask substantially conformed to the contour of the mask-support pins 49a through 49d during attachment of the mask 16 to the frame 19.

The mask 16 is then permanently attached to the frame 19 in the second station at the established second spacing. It is preferred that the skirt 17 be welded to the flange 20 at a limited number of perimetric points to permit movement of the mask 16 during heat up of the tube.

The panel 11 and mask assembly 12 is then removed from the first and second stations 24 and 25 respectively and assembled as matched work piece for further processing. The apparatus resets to a standby position in preparation for processing subsequent work pieces.

In a more specific form of the novel method, after the mask contour is conformed in the second station 25 to the contour established by the four support pins 49a through 49d, the first spacing is measured in the first station 25 between the first reference plane and the inner surface of the panel 11 at a center point 51 of the panel 11. The first spacing between the inner surface of the panel 11 and the first reference plane 30 at the center point 51 is designated spacing A (shown in FIG. 3). The second spacing between the second reference plane 48 and the inner surface of the mask 16 is measured in the second station 25 at the center point 51.

The measured spacing q at the center point 51 designated spacing C (shown in FIG. 4) is determined from the formula:

where qis the spacing parallel to the axis of the tube and t is the thickness of the mask 16. The actual spacing q is then calculated from the measured spacing q and the electrical and geometrical parameters of the tube.

After the spacing Eat the center point 51 is measured and the actual spacing q is computed, it is compared with the desired spacing q. If the actual spacing q is within the desired spacing q, the mask 16 is permanently attached to the frame. For example, for a 25VABP22 color-television picture tube, the desired spacing q at the center point 51 is 0.5540 1- 0.l5 inch, and the desired spacing q at the four points 52a through 52d is 0.5080 i 0.015 inch. Therefore, if the actual spacing q at the center point is within the desired spacing q of 0.5540 i 0.015 inch, the mask 16 is permanently attached to the frame 19.

If the actual spacing q is greater or less than the desired spacing at the center point 51, the position of the mask 16 is adjusted with respect to the second reference plane 4-8. In readjusting the position of the mask 16, all four mask-positioning units 44a through 44d are simultaneously operated to raise or lower the four mask-support pins 49a through 49d while maintaining the mask 16 conformed to the contour of the contact pins 490 through 4 9d. If the desired spacing q at the corners points 52a through 52d is exceeded before a desired spacing q at the center point 51 is obtained, the mask 16 is not attached to the frame 19. For example, if the desired spacing q of 0.5540 i 0.015 inch at the center point 51 and the desired spacing q of 0.5080 i 0.015 inch at the points 52a through 52d cannot be obtained, the mask 16 is not attached to the frame 19. The first mask is then replaced with a subsequent mask and the process is repeated. When the subsequent mask cannot be adjusted to the predetermined spacing, all work pieces are rejected without assembling. Therefore, masks 16 and frame assemblies 18 which cannot be satisfactorily spaced are not assembled, eliminating further uneconomical processing and resulting in the salvage of usable components.

Where the desired spacing q at the center point 51 has a zero tolerance (no tolerance such as the 0.015 inch in the example given) the mask 16 is adjusted with respect to the second reference plane 48 until the desired zero tolerance actual spacing q obtained at the center point 51. If the actual spacing q at the points 52a through 52d is within the desired spacing q, then the mask 16 is permanently attached to the frame 19, and if it is not within the desired spacing q, then the mask 16 and frame 19 are not assembled.

Although it is described that the same spacing is established between the mask 16 and the inner surface of the panel 11 at four points of equal radius with respect to the center point 51 of the panel 11, it is only necessary that at least four points on a circle of given radius be selected, and that the points selected be spaced on a given circle. Two sets of two symmetrical points illustrated by points 53a and 53b and 54a and 54b located on the minor axis and minor axis respectively of the panel 11 on circles of different radius with respect to the center point 51 of the panel 11 as shown in FIG. 5 may also be selected. For example, in the 25VABP22 color-television picture tube previously described, the radius of the two points 53a and 53b is 7.000 inches, and the radius of the two points 54a and 54b is 9.000 inches. The spacing q at the points 53a and 53b is about 0.5282 inch and at the points 54a and 54b is about 0.5030 inch. In addition points, such as for example points 55a through 55d and 56a through 56d (shown in FIG. 5), may be selected on circles of different radius other than or in addition to the circle of the points 52a through 52d described.

The desired value of spacing q at each position 51, 52a through 52d, 53a and 53b, 54a and 54b, 55a through 55d and 56a through 5611 can be computed and adjusted to compensate for expansion of the mask 16 during the welding operation and for assembly errors so that the desired spacing q is obtained in the finished panel assembly.

Although specific apparatus is described for comparing the measurement of a panel 11 and mask 16, other suitable apparatus may be used. As for example, the method of spacing which has been described may be described in connection with a particular apparatus where the steps may be performed by hand. In such a case, the panel 11, a preassembled frame assembly 38 and a mask 16 are positioned in fixtures as previously described in a first and second station remote from each other. The distances A, B, C and D are measured by manual-measuring means such as micrometers or dial gauges, support pins for holding the masking member are manually moved to establish the desired spacing q, and the mask 16 is forced against each support pin to conform the mask 16 to the desired contour.

I claim:

1. In the manufacture of a cathode-ray-tube maskpanel assembly including a rectangularly shaped faceplate panel having a curved faceplate and sidewalls, at least three support studs extending from said sidewalls, a frame assembly including a frame having frame-support members thereon for engagement with said studs supported in said panel, and an aperture mask positioned on said frame, the method of assembling said mask on said frame comprising the steps of a. positioning a panel in a first station,

b. locating three frame-positioning points on said points on a circle of given radius at a first spacing with respect to said frame-positioning points,

(1. generating signals related to said contour at said measured points,

e. then at a second station displaced from said first station and having no direct physical orientation with said first station establishing three reconstructed frame-positioning points which are in substantially the same geometric relationship with respect to one another as said frame-positioning points on said panel,

f. then, at said second station utilizing said signals to position four mask supports in substantially the same geometric relationship with respect to one another as said measured contour points at a second spacing with respect to said reconstructed framepositioning points,

g. temporarily positioning a shadow mask on a frame,

h. then, conforming the contour of said mask upon said positioned mask supports, and

i. permanently attaching said mask to said frame while said mask is conformed to said contour of said mask supports.

2. The method of claim 1 including prior to the attachment step, the additional steps of j. measuring the contour of said panel in said first station substantially at the center of said panel,

k. measuring the contour of said mask in said second st tio substantiall at the enter of saidm sk, l. adjusting the secoiid spacing between said mask supports and said reconstructed frame-positioning points to obtain a desired spacing between said mask and said panel when said mask is mounted in said panel while maintaining said mask conformed to said contour established by said mask supports.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3335479 *Jun 12, 1964Aug 15, 1967Rca CorpMethod of fabricating and processing cathode ray tubes
US3364728 *Apr 27, 1965Jan 23, 1968Owens Illinois Glass CoMethod and apparatus for supporting and gauging an article
US3482286 *Jan 7, 1966Dec 9, 1969Rca CorpCathode ray tube manufacture
US3537159 *Nov 19, 1968Nov 3, 1970Sylvania Electric ProdApparatus for achieving custom mask to panel spacing in cathode ray tubes
US3537161 *Nov 19, 1968Nov 3, 1970Sylvania Electric ProdProcess for achieving custom mask to panel spacing in cathode ray tubes
US3564195 *Nov 5, 1968Feb 16, 1971Admiral CorpMask-to-frame welding indicator
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3889329 *May 16, 1973Jun 17, 1975Fazlin Fazal AProcess for making color television masks
US3973964 *Dec 23, 1974Aug 10, 1976Zenith Radio CorporationMethod for manufacturing a color cathode ray tube and for making screening and mask masters used therein
US3975198 *Dec 23, 1974Aug 17, 1976Zenith Radio CorporationMethod and apparatus for manufacturing a color cathode ray tube using interchangeable shadow masks
US3989524 *Dec 23, 1974Nov 2, 1976Zenith Radio CorporationMethod for manufacturing a color cathode ray tube using mask and screen masters
US4267624 *Oct 22, 1979May 19, 1981Owens-Illinois, Inc.Method of placing mask mounting pins in a CRT faceplate
US4325166 *Mar 30, 1981Apr 20, 1982U.S. Philips CorporationMethod of manufacturing a color television display tube
US5964631 *Aug 25, 1997Oct 12, 1999Samsung Corning Co., Ltd.Method and apparatus of inserting support pins into a cathode ray tube panel
DE19737260B4 *Aug 27, 1997Oct 1, 2009Samsung Corning Precision Glass Co., Ltd., GumiVerfahren und Einrichtung zum Einsetzen von Haltestiften in eine Frontplatte einer Kathodenstrahlröhre
Classifications
U.S. Classification445/30
International ClassificationH01J29/07
Cooperative ClassificationH01J29/073
European ClassificationH01J29/07B
Legal Events
DateCodeEventDescription
Apr 14, 1988ASAssignment
Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131
Effective date: 19871208