JP3326652B2 - Frame curvature measurement device for aperture grille for cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame curvature measuring device for an aperture grill constituting a color cathode ray tube (hereinafter abbreviated as CRT), and more particularly to a frame for fixing the grill in a vertically tensioned state. The present invention relates to a frame curvature measuring device for an aperture grille for a cathode ray tube, which is used for evaluating whether or not the curvature and torsion of upper and lower members are within specified ranges.

[0002]

2. Description of the Related Art In a trinitron type CRT used for a television receiver or a display device of a computer, 3
An aperture grille for color selection having a large number of slits is mounted inside a panel in which phosphor stripes of primary colors (R, G, B) are formed on the inner surface, and is used for three primary colors emitted from an electron gun. The electron beam is passed through a slit of the aperture grill and is applied to a phosphor stripe of a corresponding color on the inner surface of the panel.

[0003] As shown in FIG. 7, an aperture grille frame 10 used in such a trinitron type CRT has an upper horizontal member 101 and a lower horizontal member 102 arranged vertically symmetrically at desired intervals. At the left and right ends of the horizontal and lower horizontal members 101 and 102, a left vertical member 103 and a right vertical member 104 horizontally fixed between the horizontal members 101 and 102 are formed in a substantially rectangular frame shape. The upper and lower horizontal members 1 in the X, Y, and Z coordinate systems when the frame 10 is viewed from the front.
The curvatures in the Y-axis direction of 01 and 102 are set to R _Y1 and R _Y2 as shown in FIG. 7A, and further, in the X, Y, and Z coordinate systems when the frame 10 is viewed from the upper surface or the lower surface. The curvatures of the upper and lower horizontal members 101 and 102 in the Z-axis direction are set to R _Z1 and R _Z2 as shown in FIG.
The allowable range of the curvatures R _Y1 and R _{Y2 in} the Y-axis direction of the upper and lower horizontal members 101 and 102 is 17 inch C
In the case of the RT, it is 0.8 mm, and the allowable range between the curvatures R _Z1 and R _{Z2 in} the Z-axis direction of the upper and lower lateral members 101 and 102 is 0.08 m in the case of a 17-inch CRT.
m. Also, the upper and lower horizontal members 101 and 102
The three-dimensional plane torsion formed by the plane including the curvatures R _Z1 and R _Z2 is set to an allowable range of 0.3 mm in the case of a 17-inch CRT. If the screen size of the CRT is different, the numerical values of the curvature and the allowable range of the twist of the horizontal member are different.

[0004] As described above, in the frame serving as the base of the aperture grille, if the curvatures R _Y , R _Z and the twist, which are the reference, are not specified, the assembly dimensions of the aperture grille become different and a good CRT is manufactured. It becomes difficult to do. In particular, when the curvature R _{Z of the} frame changes,
When the welding position of the spring to the frame for holding the aperture grille on the panel also changes, the gap (GH value) between the surface of the aperture grille and the phosphor inner surface of the panel changes and exceeds the specified value range. In addition, the color selection function of the aperture grill is reduced, which causes a problem such as color misregistration in a completed CRT. For this reason, it is necessary to manage the frames by measuring the curvatures R _Y and R _Z of the frames with a measuring device and judging whether or not the measured values are within specified values.

Conventionally, such time of curvature measurement of a frame, and both ends two places of the upper lateral members of curvature R _Z side of the frame, the lower horizontal member frame curvature measuring apparatus 1 places curvature R _Z side of of three by receiving material is supported at three points from below, after fixed positioned by the three-point support frame positioning mechanism, the R _Y plane and R _Z plane of the respective feeler upper lateral members and lower horizontal members Abutting a plurality of positions, measuring each position, calculating the curvatures R _Y and R _Z of the frame from the measured values, and determining whether the curvature difference and torsion of the horizontal members are within a specified value range based on the calculation results. Or not, and the quality of the frame is determined.

[0006]

However, in the conventional frame curvature measuring apparatus as described above, the frame is required to be 3 frames.
After the frame is placed on the receiving member by the carrying-in means, the frame tends to wobble due to the weight of the material when positioning and fixing by the positioning mechanism, and the frame is positioned in this wobbling state. In such a case, there is a problem that an error occurs in the positioning and an error also occurs in a measured value, and accurate curvature measurement cannot be performed.

The present invention has been devised in view of the above circumstances. It is an object of the present invention to enable a frame to be stably positioned on a measurement receiving member without fluctuation, and to enable accurate curvature measurement and evaluation. It is an object of the present invention to provide a frame curvature measuring device for an aperture grille for a cathode ray tube.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 comprises upper and lower horizontal members and left and right vertical members, and the upper and lower horizontal members forming the upper and lower surfaces of the frame are provided with surfaces. It is formed with a curvature R _Y, the surface of the horizontal member and lower horizontal member over which forms the front of the frame curvature R _Z
A frame curvature measuring apparatus for measuring the curvature R _Y and the curvature R _Z and twisting of the frame in the formed cathode-ray tube aperture grille, and a substrate, is erected from the substrate, the frame front is turned downward A measurement receiving member on which both ends of one of the upper and lower horizontal members are mounted, and extends along the other one of the upper and lower horizontal members, A swing member pivotally supported at a longitudinal middle portion and capable of swinging in a balance shape, and a measurement receiving member provided at both ends of the swing member, on which both ends of the other horizontal member are placed; Positioning means provided on a substrate and positioning and fixing the frame mounted on each of the measurement receiving members at a measurement position on a horizontal plane, and both lateral members of the positioned and fixed frame Rate R _Y, is made and a measurement means for measuring a R _Z and twist.

According to a second aspect of the present invention, each of the measurement receiving members is provided with a cemented carbide material at an end in contact with the lateral member.

According to a third aspect of the present invention, the positioning means includes:
First positioning means for positioning the frame mounted on each of the measurement receiving members in the longitudinal direction of the horizontal member, and second positioning means for positioning the frame in a direction perpendicular to the longitudinal direction of the horizontal member It is composed of

According to a fourth aspect of the present invention, the first positioning means contacts the left vertical member and the right vertical member of the frame by moving them from the outside to the inside by an equal distance, thereby bringing the frame into contact with the horizontal member. It comprises a pressing member for positioning in the longitudinal direction, and a driving means for moving each of the pressing members in a direction substantially perpendicular to the corresponding vertical member.

According to a fifth aspect of the present invention, the second positioning means contacts the one lateral member of the frame from the outside with a reference positioning member, and the second positioning means contacts the other lateral member of the frame from the outside to move the frame. Pressing means for positioning in a direction perpendicular to the longitudinal direction of the lateral member.

According to a sixth aspect of the present invention, the pressing member is constituted by a roller.

[0014]

According to the first aspect of the present invention, both ends of the upper and lower members of the frame, which are set with the front face down at the frame curvature measuring point, are placed on a pair of measurement receiving members erected on the substrate. Further, since the both ends of the lower horizontal member are placed on the measurement receiving members provided at both ends of the swinging member, the frame is supported at four points. Therefore, the frame does not fluctuate due to vibration, etc.
Can always be supported in a stable state. Accordingly, there is no occurrence of a positioning error when positioning the frame placed on the measurement receiving member by the positioning means, and accurate curved surface measurement can be performed.

According to the second aspect of the present invention, wear of the measurement receiving member can be prevented by providing a carbide round bar at the tip of each of the measurement receiving members on which the upper and lower horizontal members are mounted. .

By adding the configurations of claims 3, 4 and 5 to the invention of claim 1, the frame supported at four points is positioned in the Y-axis direction by the second positioning means, and the X-axis by the first positioning means. Only by positioning in the direction, the frame can be accurately positioned at the curvature measurement point.

In the invention according to claim 6, the pressing member of the first positioning means is constituted by a roller, so that the influence of the unevenness of the left and right vertical members contacted by the roller can be reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a frame curvature measuring device for an aperture grille for a cathode ray tube according to the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of the frame curvature measuring apparatus in the present embodiment, FIG. 2 is a front view thereof, FIG. 3 is a right side view thereof, and FIG. 4 is a rear view thereof. In FIG.
0 frame curvature measuring apparatus shown in, the substrate 30 is placed on the floor by the level adjustment with a leg portion 301, a pair of measuring receiving supporting the curvature R _Z side of the upper lateral members 101 of the frame 10 at both ends A member 40, a swing member 50 arranged in parallel with the lower horizontal member 102 of the frame 10,
The lower horizontal member 10 fixed to both ends of the swing member 50
And a pair of measurement receiving members 501 supporting the two curvature _RZ surface sides at both ends, and positioning the frame 10 placed on each of the measurement receiving members 40 and 501 in the longitudinal direction of the lateral members 101 and 102. The first positioning means 60 and the frame 10 placed on each of the measurement receiving members 40 and 501
Positioning means 70 for positioning the horizontal members 101 and 102 in a direction perpendicular to the longitudinal direction of the horizontal members 101 and 102, and the two horizontal members 101 and 102 of the frame 10 positioned and fixed by the first and second positioning means 60 and 70. Curvature R
_Y, and a measuring means 80 for measuring a R _Z.

As shown in FIG. 1 and FIG.
A carbide round bar 401 is soldered to the tip of each of the measurement receiving members 40, which is fixed on the upper side, and which is in contact with the upper and horizontal members 101 of each of the measurement receiving members 40 to prevent wear of about 3φ.

The rocking member 50 is formed in a substantially gate shape as shown in FIG.
A shaft 503 is pivotally supported on the upper end of a bracket 502 erected on the upper side so as to be vertically swingable. The left and right ends of the swinging member 50 extend horizontally in a direction away from each other, and the right and left ends of the swinging member 50 extend downward from the lower horizontal member 102 of the frame 10 at right angles from the ends as shown in FIG. A member 504 extending up to the end is integrally connected, and a curvature R _{Z of the} lower horizontal member 102 is provided on a tip end of the member 504.
A measurement receiving member 501 that supports the surface side at both ends is fixed. The lower horizontal member 1 of each of the measurement receiving members 501
A carbide round bar 505 is soldered to the tip that comes in contact with 02 to prevent wear of about 3φ.

The first positioning member 60 is shown in FIGS.
And the left vertical member 1 of the frame 10 as shown in FIG.
03 and the right vertical member 104 by moving the same distance from the outside to the inside in an equal distance, thereby moving the frame 10 in the longitudinal direction of the horizontal members 101 and 102 (X of the frame 10).
A pair of pressing members 601 composed of rollers for positioning in the axial direction).
Are supported by movable members 602 disposed outside the left vertical member 103 and the right vertical member 104, respectively, and each movable member 602 is provided on a guide member 60 provided on the substrate 30.
3, the left vertical member 103 or the right vertical member 10
4 is supported so as to be movable in a direction approaching substantially perpendicularly. On the other hand, the lower end of each movable member 602 is
0, protruding downward from the substrate 30, and each protruding end thereof is connected to an operation rod 604 slidably provided on the lower surface of the substrate 30 in a direction parallel to the moving direction of the movable member 602.

The movable member 602 is provided with an operation rod 604.
In contrast, the connecting position can be adjusted in the longitudinal direction of the operating rod 604, whereby the frame 10
Can be adjusted in the X-axis direction.

As shown in FIGS. 3 and 4, on the lower surface of the substrate 30 located between the movable members 602,
A rotating lever 605 is rotatably supported by a pin 606. Both ends of the rotating lever 605 and one end of each of the operation rods 604 are connected by a link 607. Further, a movable member 602 is attached to one end of the rotating lever 605. Including the pressing members 601 corresponding to the vertical members 103 and 104
Driving means for moving in a direction substantially perpendicular to the
For example, the piston rod of the air cylinder 608 is connected.

As shown in FIGS. 1 and 4, the second positioning means 70 includes a pair of reference positioning members which are located at left and right ends of the curvature _RY surface of the upper horizontal member 101 of the frame 10 and abut from outside. Each of the reference positioning members 701 determines a reference position of the frame 10 in the Y-axis direction, and includes a support member 702 fixed on the substrate 30.
The upper horizontal member 101 is provided so as to be adjustable in a direction in which the upper horizontal member 101 is separated and approached from the curvature _RY surface. Further, the second positioning means 70 is provided on the lower horizontal member 102 of the frame 10.
The frame 10 is positioned at both left and right end portions on the curvature _RY surface side and pressed from the outside so that the frame 10 is
There is provided a pair of pressing means 703 for positioning in the direction perpendicular to the longitudinal direction of 102, and each pressing means 703 is constituted by an air cylinder.

As shown in FIGS. 1 to 4, the curvature measuring means 80 includes a frame 40 positioned on the measuring member 40 and the first and second positioning members 60 and 70 on the measuring members 40 and 501. against the upper lateral members 101 of 10, the curvature R _Y plane and the curvature R _Z for Y-axis measures the curvature of the intermediate portion of the surface feeler 801C and the Z-axis measuring element 802
C, measurement receiving member 40 and measurement receiving members 40 and 501
The above 1, relative to lower horizontal member 102 of the frame 10 which is positioned by the second positioning means 60, 70, 3 of the right and left end portions and an intermediate portion of its curvature R _Y plane and the curvature R _Z plane
Three Y-axis tracing styluses 803 for measuring the curvature of a portion
L, 803R, 803C and Z axis measuring element 804L, 8
04C. In addition, each said measuring element is comprised from a magnescale.

FIG. 5 shows the upper horizontal member 10 of the frame 10.
1 and the curvature R _Z in the middle part of the lower horizontal member 102
Probes 802C and 804C for Z axis for measuring surface curvature
FIG. In FIG. 5, the Z-axis tracing stylus 802 is used.
Although the following description is made on behalf of C, the same installation structure is also used for the Z-axis tracing stylus 804C of the lower horizontal member 102. In FIG. 5, the Z-axis tracing stylus 802C is
The Z-axis tracing stylus 8 is fixed to the center of the bracket 811 provided at
Above 02C, a receiving member 812 with which the horizontal member of the frame 10 abuts is arranged. This receiving member 812
Is fixed to the upper end of a pair of guide rods 813 provided on the bracket 811 so as to be slidable in the vertical direction, and the receiving member 812 including the guide rods 813 is moved in the direction in which the compression coil springs 814 abut against the lateral members of the frame 10. While being urged, the contact portion of the receiving member 812 with the lateral member is provided with a carbide round bar 81 for preventing wear.
5 is silver brazed. The filler 802a protruding from the upper end of the tracing stylus 802C is urged toward the receiving member 812 by a built-in spring (not shown), and the tip of the filler 802a is in contact with the lower surface of the receiving member 812.

FIG. 6 shows the upper horizontal member 10 of the frame 10.
Curvature R _Y plane of the gauge head for Y-axis measures the curvature 801C and lower horizontal measuring the curvature of the curvature R _Y plane at right and left end portions and the middle portion of the member 102 Y-axis measuring element 803L in one of the intermediate portion, The configuration diagram of 803R and 803C is shown. In FIG. 5, the Y-axis tracing stylus 803C will be described as a representative. In FIG. 6, a Y-axis measuring element 803C has its filler 803a fixed horizontally through the bracket 502 so as to face the curvature _RY surface of the horizontal member of the frame 10, and a filler projecting from the tip of the measuring element 803C. 803a is urged by a built-in spring (not shown) toward the horizontal member of the frame 10, and its filler 8
The tip of 03a is in direct contact with the curvature _RY surface of the horizontal member.

An air cylinder 821 is provided on the bracket 502 in parallel with the Y-axis measuring element 803C. A hook 822 provided on a piston rod of the air cylinder 821 is used as a filler 8 of the Y-axis measuring element 803C.
By engaging the hook 823 provided on the outer cylinder 03a and extending the air cylinder 821, the filler 8
6, the filler 803a is advanced by a built-in spring (not shown) to a position where the filler 803a comes into contact with the curvature _RY surface of the horizontal member, as shown by a virtual line in FIG. As shown by the solid line in FIG. 6, when the contraction operation is performed, the filler 803a can be retracted to the position shown by the solid line in FIG. The air cylinder 821 for moving the filler of the tracing stylus forward and backward is provided with the Y-axis tracing styluses 801C, 803L, 8
It is also equipped in 03R.

On the other hand, Z-axis measuring element 804 for measuring the curvature of the curvature R _Z plane at right and left end portions of the lower horizontal member 102
As shown in FIG. 2, L is positioned below one of the measurement receiving members 501 provided on the swinging member 50 and is vertically penetrated and fixed to the substrate 30. The filler 807 protruding from the upper end is urged by a built-in spring (not shown) so as to contact the lower end surface of the receiving member 501 for measurement.

Next, the operation of the frame curvature measuring device 20 will be described. First, the frame 10 with the front facing down
Is set on the measurement receiving members 40 and 501 from above the measurement receiving members 40 and 501 by a transfer means (not shown). At this time, the curvature R _Z plane of the upper lateral members 101 of the frame 10 is placed on the measuring base member 40 of the left and right fixed side, for measuring lateral curvature R _Y plane of the lower horizontal member 102 is swinging It is placed on the receiving member 501. Therefore, frame 10 is 4
You will be supported by points. Moreover, the lower side member 10
Since the measurement receiving member 501 of No. 2 is supported by the swing member 50 pivotally supported in the balance system, the frame 10 is
Even if it is point-supported, the curvature _RZ surface of each horizontal member surely comes into contact with the tip of the corresponding measurement receiving member, and thereby the frame 10 can be stably supported without wobbling.

Next, the pressing means 7 of the second positioning means 70
The air cylinder 03 is extended so that the entire frame 10 placed on the receiving members 40 and 501 for measurement is pressed against the reference positioning member 701. This allows
The frame 10 is positioned in the Y-axis direction. Thereafter, the air cylinder 608 of the first positioning means 60 is extended to rotate the rotation lever 605 from the released state shown by the broken line in FIG. 1 to the positioning state shown by the imaginary line. Accordingly, the two operation rods 604 connected via the link 607
Move in the direction approaching each other by the same distance, the two pressing members 601 supported by the respective operating rods 604 via the movable member 602 also move in the same direction by the same distance, and the outer peripheral surfaces thereof correspond to the left side of the corresponding frame 10. It contacts the outer surfaces of the vertical member 103 and the right vertical member 104. This allows
The frame 10 is positioned in the X-axis direction.

When the positioning of the frame 10 is completed, each of the tracing styluses 801C, 802C, 803L, 803R, 80
3C, 804L, 804C are operated, to measure each point identified in curvature R _Y plane and the curvature R _Z plane of the horizontal member 101 and lower horizontal members 102 corresponding.
The measurement data of each tracing stylus is taken into an arithmetic processing unit (not shown), and is subjected to a predetermined process, so that the upper horizontal member 1
It is determined whether or not the curvatures R _Y , R _Z and torsion of the first and lower horizontal members 102 are within a specified value range, and the quality of the frame 10 is determined.

On the other hand, when the measurement of the curvature of the frame 10 is completed, the air cylinder 608 of the first positioning means 60 is contracted to move both pressing members 601 back to the positions shown by the solid lines in FIGS. (2) The frame 10 fixed in position is released by reducing the pressing means 703 of the positioning means 70. Then, the released measured frame 10 is carried out of the measuring device by a transfer means (not shown), and the unmeasured frame 10 is carried into the measuring device again.

In this embodiment, both ends of the upper horizontal member 101 of the frame 10 set face down at the frame curvature measuring point are connected to a pair of measuring receivers standing on the substrate 30. The lower side member 102 is placed on the member 40 and the both ends of the lower horizontal member 102 are
Since the frame 10 is supported at four points by being placed on the measurement receiving members 501 provided at both ends of the frame 1,
0 does not fluctuate due to vibration or the like, and can always be supported in a stable state. As a result, the frame 10 placed on the receiving member for measurement is moved to the first and second positioning means 60,
When the positioning is performed by the positioning unit 70, a positioning error does not occur, and accurate curved surface measurement can be performed.

In this embodiment, the frame 10
Is supported at four points by four measurement receiving members, the frame 10 is positioned in the Y-axis direction by the second positioning means 70, and the two pressing members 601 of the first positioning means 60 are equidistant in the direction approaching each other. To the left of frame 10,
Just by positioning the right vertical members 103 and 104 from both sides in the X-axis direction, the frame 10 can be accurately positioned at the curvature measurement point. Further, in the present embodiment, since the carbide round bar is provided at the tip of each of the measurement receiving members on which the upper and lower horizontal members are mounted, the wear of the measurement receiving members is prevented, and the measurement is always accurate. The curvature measurement can be performed. Further, in this embodiment, the pressing member 601 of the first positioning means 60 is constituted by a roller, so that the left and right vertical members 1 with which the roller abuts.
It is possible to reduce the influence of the irregularities of 03 and 104.

The present invention is not limited to the configuration shown in the above embodiment, and various changes and modifications can be made without departing from the scope described in the claims.

[0037]

As described above, according to the present invention, the upper horizontal member and the lower horizontal member, which comprise the upper and lower horizontal members and the left and right vertical members, form the upper and lower surfaces of the frame, are formed with a curvature _RY. the curvature of the lateral members and lower horizontal members of surfaces of a cathode-ray tube aperture grille made of a curvature R _Z upper frame which forms the front of the frame R _Y and the curvature R
_{What is} claimed is: 1. A frame curvature measuring apparatus for measuring _Z and torsion, comprising: a substrate; and both end portions of one of the upper and lower horizontal members of a frame which is erected from the substrate and whose front faces downward. A measuring receiving member on which the upper and lower horizontal members are placed, and which extends along the other of the upper and lower horizontal members, and is pivotally supported at a middle portion in the longitudinal direction and can swing in a balance-like manner. A member, a measurement receiving member provided on both ends of the swinging member, on which both ends of the other lateral member are mounted, and the measurement receiving member provided on the substrate and mounted on each of the measurement receiving members. Positioning means for positioning and fixing the frame at a measurement position on a horizontal plane,
A measurement means for measuring the curvatures R _Y , R _Z and torsion of both lateral members of the frame fixed and positioned is provided. Therefore, the frame can be stably positioned on the measurement receiving member without wobble, accurate curvature measurement can be performed, and the frame can be accurately evaluated.

Further, according to the present invention, a pair of measurement receiving members provided on a substrate with a frame set on a curvature measuring point and a pair of measurement receiving members provided on a balance type swing member are provided. Since the frame is supported at four points, the frame supported at four points is positioned in the Y-axis direction by the second positioning means,
The frame is accurately positioned at the curvature measurement point by simply positioning the frame in the X-axis direction by holding the left and right vertical members of the frame from both sides by making the two pressing members of the first positioning means equidistant in the direction approaching each other. can do. Further, according to the present invention, the wear of the measurement receiving member can be prevented by fixing the carbide round bar to the tip of each of the measurement receiving members on which the upper and lower horizontal members are mounted.
Further, according to the present invention, the pressing member of the first positioning means is constituted by a roller, so that the left contact of the roller,
The influence of the unevenness of the right vertical member can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a frame curvature measuring device according to the present invention.

FIG. 2 is a front view of a main part of the frame curvature measuring device shown in FIG.

FIG. 3 is a right side view of a main part of the frame curvature measuring device shown in FIG.

FIG. 4 is a rear view of a main part of the frame curvature measuring device shown in FIG. 1;

FIG. 5 is a configuration diagram of a Z-axis tracing stylus in the present embodiment.

FIG. 6 is a configuration diagram of a Y-axis tracing stylus in the present embodiment.

7A and 7B show a frame of an aperture grille for a CRT, and FIG. 7A is a schematic front view thereof, and FIG. 7B is a schematic plan view thereof.

[Explanation of symbols]

10 Frame 101 Upper horizontal member 102 Lower horizontal member 103 Left vertical member 104 Right vertical member 20 Frame curvature measuring device 30 Substrate 40 Measurement receiving member 401 Carbide round bar 50 Swing member 501 Measurement receiving member 505 Carbide round bar 60 First positioning means 601 Pressing member 608 Air cylinder (driving means) 70 Second positioning means 701 Reference positioning member 703 Pressing member (air cylinder) 80 Curvature measuring means 801C, 803L, 803R, 803C Y-axis measuring elements 802C, 804L, 804C Probe for Z axis

Claims (6)

(57) [Claims] 1. An upper horizontal member and a lower horizontal member, which comprise upper and lower horizontal members and left and right vertical members. Upper and lower members forming upper and lower surfaces of the frame have a curvature _RY , and upper and lower members forming a front surface of the frame. surface of the horizontal member is a frame curvature measuring apparatus for measuring the curvature R _Y and the curvature R _Z and twisting of the frame of a cathode ray tube for an aperture grille made of a curvature R _Z, and the substrate, is erected from the substrate, A measuring receiving member on which both ends of one of the upper horizontal member and the lower horizontal member of the frame whose front faces downward, and the other horizontal member of the upper horizontal member and the lower horizontal member Extending along and supported at its longitudinal middle part
A swing member swingable in a balance shape, a measurement receiving member provided at both ends of the swing member, on which both ends of the other horizontal member are mounted, and a measurement receiving member provided on the substrate, Positioning means for positioning and fixing the frame mounted on the receiving member at a measurement position on a horizontal plane; measuring means for measuring the curvatures R _Y , R _Z and torsion of both lateral members of the frame fixed and positioned, A frame curvature measuring device for a cathode ray tube aperture grill comprising: 2. A frame curvature measuring apparatus for a cathode ray tube aperture grill according to claim 1, wherein each of said measurement receiving members is provided with a superhard material at an end thereof in contact with a lateral member. 3. The positioning means comprises: first positioning means for positioning the frame mounted on each of the measurement receiving members in the longitudinal direction of the lateral member; and positioning the frame in the longitudinal direction of the lateral member. And second positioning means for positioning in a right angle direction.
A frame curvature measuring device for an aperture grill for a cathode ray tube according to the above. 4. The first positioning means positions the frame in the longitudinal direction of its horizontal member by moving in contact with the left vertical member and the right vertical member of the frame from the outside to the inside by an equal distance. 4. A frame curvature measuring apparatus for a cathode ray tube aperture grill according to claim 3, further comprising a pressing member, and a driving means for moving each of said pressing members in a direction substantially perpendicular to a corresponding vertical member. 5. A reference positioning member that abuts one lateral member of the frame from outside, and a second positioning means that abuts the other lateral member of the frame from outside to move the frame in the longitudinal direction of the lateral member. 5. A frame curvature measuring apparatus for an aperture grille for a cathode ray tube according to claim 3, further comprising a pressing means for positioning in a direction perpendicular to the frame. 6. The apparatus according to claim 4, wherein said pressing member comprises a roller.