JP2001135235A - Measurement unit for electron gun-sealing accuracy, electron gun-sealing unit and master gauge for cathode- ray tube, and method for measuring electron gun sealing accuracy for cathode-ray tubes and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide measuring unit and method for electron-gun sealing- accuracy of cathode-ray tubes, a manufacturing method for electron gun-sealing units that can seal the electron gun with a high accuracy and cathode-ray tubes, and a master gauge suitable for these measurement of sealing accuracy and sealing. SOLUTION: A master gauge is constituted that has a stem 90 installed with at least three stem pins 91 (91A, 91B, 91C), having a thick part 92 and a thin part 93. Electron-gun sealing accuracy of a cathode-ray tube is measured, by using the master gauge on the electron-gun sealing-accuracy measuring unit equipped with a support of holding a body of cathode-ray tube and a stem holder with holes to insert stem pins of the electron gun as the standard unit for measurement.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electron gun sealing accuracy measuring device for a cathode ray tube, an electron gun sealing device and a master gauge for a cathode ray tube, a method for measuring an electron gun sealing accuracy of a cathode ray tube, and a method of manufacturing a cathode ray tube. Involved in the method.

[0002]

2. Description of the Related Art In a sealing accuracy measuring machine for sealing an electron gun in a CRT (cathode ray tube), important parts such as a master gauge, which is a model of the size and shape of an actual cathode ray tube, are used. Measurements are being taken for the measurement items.

[0003] The master gauge is provided with a portion along the outer shape of the funnel portion and the neck portion of the cathode ray tube. In a portion of the master gauge corresponding to the neck portion of the cathode ray tube, a stem pin having the same configuration as the stem pin of the actual electron gun, that is, the number of stem pins is provided so as to correspond to the electron gun sealed in the neck portion. A stem having the same stem pin as that of the electron gun is attached.

[0004] The sealing accuracy measuring device is configured by attaching a stem holder having a hole for receiving a stem pin of a master gauge to a table movable in a horizontal direction and a vertical direction. Also, to be able to measure the position of the stem holder,
A measuring device in the horizontal direction, for example, the X direction and the Y direction, and a measuring device in the vertical direction are provided for the table. Then, the position of the table is adjusted so that the stem pin of the master gauge is inserted into the hole of the stem holder, and the stem pin of the master gauge is inserted into the stem holder.

In the measurement, first, various measurements are performed using a master gauge, and the measured values are used as reference values. After that, various measurements are performed on the cathode ray tube to which the electron gun is actually attached, and comparison with a reference value is performed.

FIG. 16 shows the stem at the tip of the master gauge.
Shown in FIG. 16A is a side view, and FIG. 16B is a plan view seen from the tip. As shown in FIGS. 16A and 16B, a stem pin 101 (in this case, 11
Book) is provided. The central through hole 102 is for fixing the stem 100 to the master gauge body (see FIGS. 10 and 11). The eleven stem pins 101 are arranged on a circle centered on the axis of the stem 100. In the case of FIG. 16, the eleven stem pins 101 are arranged at eleven positions except for three of the positions obtained by dividing the circumference into 14 equal parts.

FIG. 1 is a schematic diagram of the stem holder.
7A to 17C. 17A is a plan view, FIG. 17B is a cross-sectional view taken along the line PP ′ of FIG. 17A, and FIG.
Sectional views taken along line QQ 'of FIG. This stem holder 110 has a master gauge stem pin 1
01 and holes 111 for inserting the stem pins of the electron gun are provided corresponding to the number of the stem pins. This FIG.
Indicates a case where the number of stem pins is 11. Also, 1 in the figure
Reference numeral 12 denotes a cutout for attaching the stem holder 110 to the other portion of the table, and reference numeral 113 denotes a hole for inserting a rotation shaft (not shown). As shown in the cross-sectional views of FIGS. 17B and 17C, there is a portion having a large diameter in the middle of the hole 113 at the center, and the lower surface 114 serves as a reference plane in the vertical direction. The hole 111 into which the stem pin is inserted has a tapered inlet and a narrower depth. Further, behind the hole 111, there is a surface serving as the reference surface 114 described above. The stem pin enters the hole 111 using the tapered portion as a guide.

[0008] Then, as shown in a schematic cross-sectional view of a state where the stem pin 101 is inserted in FIG. 17D, the stem pin 101 is inserted into the hole 111 of the stem holder 110 so that the tip of the stem pin 101 abuts the reference surface 114. . In this abutted state, the reference surface 1
The distance from 14 to the phosphor screen, that is, the so-called sealing length can be obtained.

[0009] The stem holder 110 is provided in the X direction.
It is mounted on a floating unit that can move freely in the Y direction and rotation direction. When the stem pin is inserted, the stem holder 110 moves according to the sealed shape of the electron gun, so read the value of the dial gauge at that time. Thus, the values in the X, Y and rotation directions can be measured.

[0010]

By the way, the stem pin of the electron gun is easy to bend due to its small diameter.
Then, as described above, the master gauge stem pin 10
1 also has the same thickness as the stem pin of the electron gun,
When using the master gauge, especially when using the stem holder 1
When inserting the stem pin into the hole 111 of the tenth or storing the used master gauge, the stem pin 101
May be bent. When the stem pin 101 is bent, the stem holder 110 is bent by the amount corresponding to the bending.
Is displaced, the measuring instrument provided for the above-described table cannot accurately measure the position of the master gauge, and as a result, the accuracy of the measurement decreases.

Also, since the hole 111 of the stem holder 110 needs a margin for smoothly inserting a large number of stem pins, it is impossible to follow the accuracy by all means, and there is a limit in accuracy in this point as well. Since the stem pin itself may be bent and inserted into the hole 111 of the stem holder 110, it is useless to include the shape of the stem pin in the inspection item.

If the sealing position of the electron gun is shifted, for example, if the positional relationship between the center axis of the electron gun and the tube axis of the cathode ray tube deviates from the design conditions, the irradiation position of the electron beam is shifted to the fluorescent screen. A cathode ray tube which is deviated from the position of a predetermined phosphor is formed. Such a cathode ray tube cannot be used as a product, and when it is returned to the atmosphere from a vacuum-sealed state, the inside is oxidized, so that a part of the cathode ray tube cannot be reused.

[0013] Therefore, the displacement of the sealing position causes an increase in a defective rate in manufacturing and a factor in increasing manufacturing costs. Therefore, it is important to accurately control the sealing position of the electron gun, and it is necessary to measure the sealing accuracy of the electron gun.

Conventionally, when the stem pin 101 of the master gauge is bent as described above, the stem pin 101 is bent.
, The reference value obtained by measuring the master gauge was not always constant. Therefore, it is necessary to compare the measured value of the cathode ray tube in which the actual electron gun is sealed with the reference value and relatively grasp and perform the manufacturing control.

In order to solve the above-mentioned problems, the present invention provides an electron gun sealing accuracy measuring apparatus and method for a cathode ray tube capable of accurately measuring the sealing accuracy of an electron gun. An object of the present invention is to provide a cathode ray tube electron gun sealing apparatus and a cathode ray tube manufacturing method capable of sealing an electron gun with high accuracy, and a master gauge suitable for measuring and sealing the sealing accuracy. .

[0016]

SUMMARY OF THE INVENTION The present invention relates to an apparatus for measuring the sealing accuracy of an electron gun sealed in a cathode ray tube before sealing the cathode ray tube. A supporting portion for supporting a cathode ray tube, and a stem holder having a hole for inserting a stem pin of an electron gun, wherein at least three stem pins having a thick portion on a root side and a thin portion on a tip side are provided. The measurement of sealing accuracy is performed using the master gauge attached above as a reference device for measurement.

An electron gun sealing apparatus for a cathode ray tube according to the present invention is an apparatus for sealing an electron gun in a cathode ray tube body, comprising a support portion for supporting the cathode ray tube body and a hole for inserting a stem pin of the electron gun. A position of the electron gun to be sealed using a master gauge having at least three or more stem pins having a thick portion on the base side and a thin portion on the tip side as a reference device. Is set.

The master gauge of the present invention simulates the shape of a cathode ray tube, serves as a reference device for the sealing position of the electron gun,
The distal end has at least three stem pins, and the stem pin has a structure including a thick portion on the root side and a thin portion on the distal side.

The method for measuring the electron gun sealing accuracy of a cathode ray tube according to the present invention is made by simulating the shape of a cathode ray tube, has at least three stem pins at the tip end, and the stem pins are connected to a thick portion on the base side. By using a master gauge structured as a thin part on the tip side as a reference device, the position of the electron gun sealed in the cathode ray tube relative to the measured value of the master gauge is measured, thereby sealing the electron gun. It measures accuracy.

The method of manufacturing a cathode ray tube according to the present invention simulates the shape of the cathode ray tube body, has at least three or more stem pins at the distal end, and the stem pin has a thick portion at the base and a thin portion at the distal end. After the process of adjusting the position of the electron gun according to the position of the master gauge and fixing the electron gun using a master gauge having a structure consisting of as a reference device, the process of sealing the electron gun to the cathode ray tube body Is what you do.

According to the configuration of the master gauge of the present invention described above, the distal end has at least three stem pins,
This stem pin has a structure consisting of a thick part on the base side and a thin part on the tip side.This ensures strength at the thick part on the base side so that the stem pin does not bend, and a precision on the thin part on the tip side. Good positioning can be achieved. Further, if the number of stem pins is three or more, accurate positioning can be performed, and stability at the time of insertion into the hole of the stem holder can be secured.

According to the apparatus for measuring the electron gun sealing accuracy of a cathode ray tube and the method for measuring the electron gun sealing accuracy of a cathode ray tube of the present invention, the sealing accuracy of the electron gun is measured by using the master gauge having the above-described structure. Therefore, the measurement is performed using the measured value of the master gauge accurately positioned by the stem pin as a reference value.

According to the apparatus for sealing an electron gun of a cathode ray tube and the method of manufacturing a cathode ray tube of the present invention described above, the electron gun is sealed using the master gauge having the above-described configuration, so that the positioning is accurately performed by the stem pin. The electron gun is sealed at the position of the master gauge that has been removed.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to an apparatus for measuring the sealing accuracy of an electron gun sealed in a cathode ray tube before sealing the cathode ray tube, comprising a support for supporting the cathode ray tube. A stem holder having a hole into which a stem pin of an electron gun is inserted, and a master gauge having at least three or more stem pins having a thick portion on the base side and a thin portion on the tip side attached thereto as a measurement standard. This is an electron gun sealing accuracy measuring device for a cathode ray tube, which is used to measure the sealing accuracy.

According to the present invention, in the electron gun sealing accuracy measuring device for a cathode ray tube, a part of the hole of the stem holder is
The master gauge has a configuration corresponding to the thick and thin portions of the stem pin.

The present invention relates to a device for sealing an electron gun in a cathode ray tube, comprising a support for supporting the cathode ray tube, and a stem holder having a hole for inserting a stem pin of the electron gun. An electron gun of a cathode ray tube in which the position of an electron gun to be sealed is set using a master gauge having at least three stem pins having a thick portion on the root side and a thin portion on the tip side as a reference device. It is a sealing device.

According to the present invention, in the electron gun sealing device for a cathode ray tube, a part of a hole of the stem holder has a shape corresponding to a thick part and a thin part of a stem pin of the master gauge.

According to the present invention, there is provided a master gauge which simulates the shape of a cathode ray tube and serves as a reference device for a sealing position of an electron gun. This is a master gauge with a structure consisting of a thick part on the side and a thin part on the tip side.

The present invention simulates the shape of a cathode ray tube, has at least three stem pins at the distal end, and has a structure in which the stem pin has a thick portion on the root side and a thin portion on the distal side. Using the master gauge as a reference, measuring the position of the electron gun sealed in the cathode ray tube with respect to the measured value of the master gauge, thereby measuring the sealing accuracy of the electron gun. This is an accuracy measurement method.

The present invention simulates the shape of a cathode ray tube, has at least three stem pins at the distal end, and has a structure in which the stem pin has a thick portion on the base side and a thin portion on the distal side. Using a gauge as a reference,
This is a method for manufacturing a cathode ray tube in which a step of adjusting the position of the electron gun according to the position of the master gauge and fixing the electron gun is followed by a step of sealing the electron gun in a cathode ray tube body.

First, prior to the description of embodiments of the present invention, an outline of the present invention will be described.

FIG. 1 is a schematic structural view of one embodiment of a color cathode ray tube (color CRT) used for a television or a computer display as a cathode ray tube to which the present invention is applied. FIG. 2 is a schematic sectional view of the color cathode ray tube of FIG. The color cathode ray tube 10 has a cathode ray tube body 1 comprising a front panel portion 1a, a central funnel portion 1b, and a rear neck portion 1c, and the panel portion 1a is made of a phosphor applied to the inner surface thereof. A fluorescent screen 7 is provided, a deflection coil 8 is provided outside the funnel 1b, and the electron gun 2 is provided inside the neck 1c.

The color selection mechanism 3 is arranged so as to face the fluorescent screen 7 at a predetermined interval. The color selection mechanism 3 mainly includes a color selection electrode thin plate 11 having an electron beam transmission hole 4 for selectively transmitting an electron beam, and a frame 6 (6a, 6b) supporting the same. The emitted electron beam is guided to the fluorescent screen 7 through the electron beam passage hole.

The operation principle of the color cathode ray tube 10 is roughly as follows. The insides of the panel portion 1a and the funnel portion 1b of the cathode ray tube 1 are evacuated, and the electrons emitted from the electron gun 2 hit the phosphor applied to the inner surface (the phosphor screen 7) of the panel portion 1a. The kinetic energy of the electrons is converted to the energy of light emission of the phosphor. A current is applied to the deflection coil 8 attached to the funnel 1b to deflect the traveling direction of the electron beam in the horizontal and vertical directions so that a predetermined phosphor on the phosphor screen 7 is irradiated.

Neck 1c provided with electron gun 2 inside
Many stem pins 21 protrude from the tip of
The stem pin 21 functions as a connector for supplying, for example, a driving power supply or a predetermined voltage to the electron gun 2.

In FIG. 2, when the length from the fluorescent screen 7 to the tip of the stem pin 21 is defined as a sealing length L, when the electron gun 2 is sealed in the cathode ray tube 1, this sealing length L The cathode ray tube 1 is sealed so as to have a predetermined length according to the standard.

Here, FIG. 3 shows a schematic configuration diagram of the electron gun 2.
You. FIG. 3A is a plan view of the stem pin 21 as viewed from the tip side,
FIG. 3B shows a side view, respectively. Usually, the electron is an electron gun 2
Generated from inside cathode (cathode)
And accelerated by various electron lenses to become phosphor
Irradiated. The electron gun 2 uses these accelerators and electron lenses.
As each electrode to be formed, a first electrode G ₁, The second electrode G_Two,
Third electrode G_Three, The fourth electrode G_Four, Fifth electrode G_FiveAnd deflection plate
24 is sandwiched between both sides of the bead glass 22 by a predetermined length.
It has a fixed structure.

A large number of stem pins 21 for supplying power for driving the electron gun 2 are provided, and in this case, eleven are provided as shown in FIG. 3A. The eleven stem pins 21 are arranged on a circle centered on the axis of the electron gun 2, and are arranged at eleven positions except for three of the positions obtained by dividing the circumference into 14 equal parts.

A built-in resistor 26 is provided at the center of the electron gun 2 in the axial direction. One terminal t ₁ of the built-in resistor 26 has _one of the stem pins 21 to which the ground potential is applied.
The other terminal t ₂ is electrically connected to the book, and is electrically connected to and fixed to the deflection plate 24. Terminal t ₃ of the middle is connected to the fifth electrode G ₅ in which the anode voltage is applied. The third electrode G ₃ and the fifth electrode G ₅ are connected by providing a wiring (not shown) on the side opposite to the internal resistor 26.

The details of the eleven stem pins 21 are to heat three cathodes (cathodes) respectively connected to three cathodes (cathodes) R, G, B provided at positions hidden by the first electrode G _1. two supplying a current to the heater, one supplies a first electrode G ₁ voltage three supplies to, one supplies a voltage to the second electrode G _2, the voltage to the fourth electrode G ₄ through the wiring 29, One is connected to the built-in resistor 26.
Note that, depending on the configuration of the electron gun 2, the stem pin 21 is
Not only the number of the pins but also the number of the pins increases or decreases.
1 is attached.

The stem pin 21 is fixed by a disk-shaped glass 23, and the outer edge 23a of the glass 23 is fixed to the glass of the neck portion 1c, so that the electron gun 2 is sealed in the neck portion 1c of the cathode ray tube 1. You. In a manufacturing facility of the cathode ray tube 10, a device that automatically seals the electron gun 2 is a sealing machine (Auto Gun Seal machine: AGS).

Due to the structure of the cathode ray tube 10, if the sealing position of the electron gun 2 is shifted as described above, it becomes impossible to operate properly, so that the sealing accuracy of the electron gun 2 is required to be extremely strict.

In order to achieve the sealing accuracy of the electron gun 2,
Measurement items for quality control include sealing length, gun rotation, X direction
There are gun positions in the directional and Y directions. The sealing length is
As shown in FIG. 2, from the tip of the stem pin 21 to the fluorescent screen 7
At the distance L. The gun is rotated around the axis of the electron gun 2.
It is a value of a translocation coordinate, and the third electrode G of the electron gun 2 _ThreeAxisymmetric
Using the two holes 30 provided, the periphery of the neck portion 1c is
A light-emitting part and a light-receiving part are provided axially symmetrically around the
Light reaches the light receiving part while generating light from the diode
Obtain by measuring the rotation angle (rotation coordinate) of the position
be able to.

In the measurement of these items, after sealing the electron gun 2 with the sealing machine, the sealing accuracy measuring machine (AG
S Checker). 4 to 6 show schematic configuration diagrams of this sealing accuracy measuring device. 4 is a front view, FIG. 5 is a side view, and FIG. 6 is a plan view. In the sealing accuracy measuring device 40, a table unit 42 that moves up and down along a ball bush provided on a shaft 44 connected to the pedestal 41.
And a holding portion 43 which is located above and holds the cathode ray tube 1.

The table unit 42 has a sealing accuracy measuring section described later and a stem holder into which the stem pin 21 is inserted.

The holding section 43 includes a cone receiver 61, a pad section 62, and a pressing unit 63. The cone receiver 61 holds the cathode ray tube 1 by receiving a portion where the tube going from the neck portion 1c of the cathode ray tube 1 to the funnel portion 1b becomes thicker, that is, a so-called circular section, and holds the cathode ray tube 1 in the Z direction (vertical direction). ) Is fixed. The pad portion 62 serves as a reference for positioning in the horizontal direction by abutting the panel portion 1a of the cathode ray tube near the panel portion 1a from the horizontal direction. The pad portions 62X and 62Y are provided in the X direction and the Y direction, respectively. Can be In this case, one pad portion 62X in the X direction and two pad portions 62Y in the Y direction are provided. The pressing unit 63 presses the cathode ray tube 1 from the side to form the pad portion 62.
And fixed at a predetermined position.

In FIGS. 4 and 6, two different sizes of cathode ray tubes 1 (1a, 1b) are indicated by chain lines, and the sealing accuracy of the cathode ray tubes 1a, 1b of such different sizes is reduced. This shows a configuration that allows measurement. Then, the pad portions 62 (62X, 62Y) corresponding to the size of the cathode ray tube 1 are formed.
The position of the pressing unit 63 is also changed.

In measuring the sealing accuracy, first, the cathode ray tube body 1 in which the electron gun 2 is sealed is placed on the cone receiver 61 and fixed in the Z direction. Then, the pad portion 62 (62X, 62Y) that has been calibrated and fixed in advance
Then, the pressing unit 63 is rotated as shown by the arrow in FIG. 6 to press the cathode ray tube 1, thereby fixing the X and Y directions of the cathode ray tube 1. Then, in order to measure the sealing accuracy, the table unit 42 on which the sealing accuracy measuring unit is mounted is raised.

Next, the table unit 42 will be described. 7 to 9 show schematic configuration diagrams of the table unit 42. FIG. 7 is a front view, FIG. 8 is a side view, and FIG. 9 is a plan view. The table unit 42 is roughly divided into a main table 71 fixed in the horizontal direction, a floating unit 72 floating in the main table 71 and movable in the horizontal direction, and a sealing accuracy measuring unit. . The sealing accuracy measuring unit includes a measuring gauge, a micrometer, and the like, and is provided with measuring units 73X and 73Y in the X direction and the Y direction, respectively.

The main table 71 is vertically movable with respect to the pedestal 41 along a ball bush provided on the shaft. The floating unit 72 includes this unit 7
There is a rail 72Y that slides 2 in the Y direction and a rail 72X that slides in the X direction, on which a thin table 74 is located. A rotary unit 75 having a concentric structure rotatable about the same axis is provided on the table 74, and the stem holder 52 is attached to the uppermost part of the rotary unit 75. The belt 60 is hung in the middle of the rotating unit 75, and the rotating unit 75 can be rotated around the axis by moving the belt 60 by the motor 59. The belt 60 is also hung on a shaft on a rotary encoder 76, and the rotation encoder 76 can detect the rotation direction of the rotation unit 75 and measure the rotation angle.

A dial gauge 46 is attached to the shaft 44 on the left side in FIG. 7, and a block 45 for receiving the dial gauge 46 is attached to a columnar component attached to the left end of the main table 71. This makes it possible to perform position measurement in the Z direction (vertical direction of the measuring device; tube axis direction of the cathode ray tube).

When the table unit 42 is raised along the ball bush when measuring the sealing accuracy,
When the stem holder 52 is raised, the stem pin 21 of the electron gun 2 sealed in the cathode ray tube 1 is a hole provided in the stem holder 52 (corresponding to 110 in FIG. 17).
Is inserted into.

When the stem pin 21 is inserted into the hole, it follows the sealing shape of the electron gun 2 and the floating unit 5
2 moves in the X direction or the Y direction, or the rotating unit 75 rotates. Therefore, by reading the value of the dial gauge or rotary encoder at that time, X,
Y and the value in the direction of rotation can be measured. In addition, at this time, the dial gauge 46 hits the block 45 provided at the end of the table unit 42, and the sealing length L can be obtained from the dimension when the dial gauge 46 hits.

In addition, although not shown, the neck portion 1c
A light receiving section light emitting portion in axial symmetry are arranged around the, while generating light from a light emitting portion for example, a light-emitting diode as described above, provided on the shaft symmetrically to the third electrode G ₃ of the electron gun 2 2
It is configured to measure a rotation angle (rotation coordinate) of a position where light reaches the light receiving unit through the three holes 30.

The sealing accuracy measuring device 40 needs to be calibrated periodically because of the necessity of maintaining the accuracy. For the various measurement items, the sealing accuracy measuring device 40 is replaced with the cathode ray tube 1 having known data. Therefore, a master gauge (CRT master gauge) described above is used. This master gauge is formed by performing processing with high processing accuracy, and various measurement items are measured in advance by a three-dimensional shape measuring device, and measurement is performed by the sealing accuracy measuring device 40 using the master gauge. The calibration of the sealing accuracy measuring device 40 can be performed based on the measurement data obtained by the above.

FIGS. 10 and 11 are schematic structural views of the master gauge. 10A is a side view, FIG. 10B is a plan view seen from the side corresponding to the panel section, and FIG. 11 is another side view. The master gauge 80 is used for the cathode ray tube 1
And a base 82 to which the shaft 81 is attached. The base 82 has X
One unit 84 for positioning in the direction and two units 83 for positioning in the Y direction are attached.
In addition, receiving pads 85 and 8 are connected via cylindrical parts 89.
6 is attached. Unit 83 and unit 84
Are in contact with the pad portions 62Y and 62X of the sealing accuracy measuring device 40, respectively.
Is a unit to which the pressing unit 63 of the sealing accuracy measuring device 40 is pressed. The distal end surfaces of the units 83 and 84 are surfaces whose accuracy is compensated, so that the master gauge 80 can be accurately positioned.

A hat-shaped part 87 is attached in the middle of the shaft 81. By supporting this part 87 with the cone receiver 61 of the sealing accuracy measuring machine 40, the master gauge 8
0 is fixed in the Z direction (the tube axis direction of the cathode ray tube). A cover 88 is attached to the tip of the shaft 81. A stem provided with a stem pin is attached inside the cover 88, and the cover 88 protects the stem pin from being damaged.

By adopting such a configuration, the master gauge 8 corresponding to a cathode ray tube having a shape shown by a chain line in the figure can be obtained.
It becomes 0.

The displacement and the rotation angle of the electron gun 2 in the X and Y directions, which are the measurement items of the sealing accuracy of the electron gun 2, are usually measured by inserting the stem pin of the electron gun 2 into the stem holder. . Conventionally, since the same number of stem pins having the same shape as the stem pins 21 of the electron gun 2 of the cathode ray tube 1 are attached to the master gauge 80, the above-described problems such as the inability to ensure accuracy have occurred.

Therefore, in the present invention, the stem and the stem pin of the master gauge 80 are devised to solve the above-mentioned problem. Also, the stem holder 52 changes the shape of the hole corresponding to the stem and stem pin of the master gauge 80.

As an embodiment of the present invention, a schematic configuration diagram of a stem of the master gauge 80 is shown in FIG. FIG.
FIG. 12A is a side view, and FIG. 12B is a plan view as seen from the tip side of the stem pin. FIG. 13 is an enlarged view of the stem pin of the stem of FIG.

The stem 90 has three stem pins 9
1 (91A, 91B, 91C) are mounted on a circle centered on the axis of the stem 90. Each of the stem pins 91 has a structure having a large-diameter portion 92 and a small-diameter portion 93 as shown in an enlarged view of FIG.

The provision of the large-diameter portion 92 at the base makes it difficult for the stem pin 91 to bend, thereby obtaining reproducibility of strength. In addition, the thin portion 9 on the tip side
3 has the same thickness as the stem pin 21 of the electron gun 2. Thereby, the horizontal accuracy of the stem holder 52 that moves when inserted into the hole of the stem holder 52 is measured.

Further, in the present embodiment, the number of stem pins 91 of the stem 90 of the master gauge is set to a minimum of three. Originally, one or more stem pins are required for measuring the sealing length, and two or more stem pins are required for measuring the displacement (ΔXY) in the X and Y directions of the electron gun. Therefore, at least two stem pins are sufficient. It can be measured.

However, due to the structure of the stem 90, it is not stable to move the floating unit 72 to which the stem holder 52 is attached by using only two stem pins. Therefore, three stem pins 91A, 91B, 91 are used.
C is used. In the case of FIG. 12, three stem pins 91A, 91B, 91C are arranged so as to form a substantially isosceles triangle.

FIG. 14 is a schematic configuration diagram of the stem holder 52 in the present embodiment. FIG. 14A is a plan view, and FIG. 14B is a schematic sectional view in a state where a stem pin is inserted. The stem holder 52 is provided with eleven holes for inserting the stem pins 91 of the master gauge 80 and the stem pins 21 of the electron gun 2 corresponding to the number of the stem pins 21 of the electron gun 2. This is the same as the stem holder 110 having the conventional configuration in FIG.

In the stem holder 52 of the present embodiment,
In particular, the three stem pins 91A, 9 of the master gauge 80
The three holes 53 into which 1B and 91C are inserted and the other eight holes 54 have a feature that their shapes are different. Specifically, the hole 53 of the master gauge 80 into which the stem pin 91 is inserted is formed by the thin portion 93 and the thick portion 9 of the stem pin 91.
2, the diameter of the hole 53 is changed. Since the thin portion 93 has the same thickness as the stem pin 21 of the electron gun 2, the stem pin 21 of the electron gun 2 can be inserted into the hole 53. Also in this hole 53, a tapered portion is provided at the entrance to serve as a guide.

The other eight holes 54 have the same configuration as the holes 111 of the stem holder 110 in FIG. The configuration other than the hole 53 is the same as the stem holder 110 shown in FIG.
However, since the hole 53 is expanded in accordance with the stem pin 91 of the master gauge 80, the thickness of the hole 55 into which the rotation shaft is inserted is made slightly thinner.

FIG. 14B shows the case where the height from the entrance of the hole to the reference surface 56 is the same as that in FIG. 17, but the height from the hole to the reference surface 56 is increased as shown in FIG. Thick part 9 of stem pin 91 of gauge 80
2 may be configured to be easy to hold.

By configuring the stem holder 52 in this manner, the sealing accuracy of the stem pin 21 of the electron gun 2 and the stem pin 91 of the master gauge 80 can be measured.

That is, since the stem holder 52 is mounted on the floating unit 72 which can freely move in the X direction, the Y direction and the rotation direction, when the stem pins 21 and 91 are inserted, the stem holder 52 follows the sealing shape of the electron gun 2. Since the stem holder 52 moves, the values in the X direction, the Y direction, and the rotation direction can be measured by reading the value of the dial gauge or the like of the measuring unit at that time. Also, by contacting the stem pins 21 and 91 with the reference surface 56 of the stem holder 52 and reading the value of the dial gauge 46 hitting the block 45 in that state, the sealing length L is obtained based on this value. Can be.

According to the above-described embodiment, the number of stem pins 91 of master gauge 80 is reduced from 11
The number of holes in the stem holder 52
3 can be smoothly inserted, and accuracy reproducibility and reliability can be improved.

Further, by adopting a stepped structure having a thick portion 92, the stem pin 91 of the master gauge 80 is provided.
In order to improve the load resistance and the impact resistance of the master gauge 80, the stem pin 91 is prevented from bending.
Of the stem pin 91 can be held in a high state. This also improves the reproducibility and reliability of the measurement accuracy.

Since the stem pin 91 is not bent, the length of the stem 90 (or the sealing length L) can be accurately measured. Accordingly, the length of the stem 90 or the sealing length L of the master gauge 80 can be measured and included in the test items.

If it is found out of the standard by the measurement of the sealing accuracy, the neck 1c is replaced and the electron gun 2 is re-inserted.
Can be inserted and sealed. Therefore, it is possible to reuse components such as the panel portion 1a and the funnel portion 1b, the fluorescent screen 7, and the color selection mechanism 6, and the number of components to be discarded can be reduced.

According to the configuration of the present embodiment, it is possible to measure the sealing accuracy with higher accuracy and reproducibility than before, so that the product is sent to the next step as a good product and the product is resealed as a defective product. Can be more appropriately selected, and as a result, the yield of the cathode ray tube can be improved.

In the above embodiment, the present invention is applied to the electron gun 2
Although the configuration of the master gauge 80 and the stem holder 52 described above is applied to the sealing accuracy measuring device 40 of the above, the sealing device that seals the electron gun 2 to the neck portion 1c of the cathode ray tube 1 is also used. It can be used similarly.

Specifically, the measuring unit of the sealing accuracy measuring device 40, that is, the measuring device in the X direction, the Y direction, and the rotating direction is removed, and
Instead, a heater for heating and sealing the neck portion 1c and the stem glass of the electron gun 2 is provided.
For example, as shown in FIG. 15, a jet heater H is provided around the tip of the neck 1c.

Then, the electron gun 2 can be sealed in the following manner. First, the stem pin 91 is inserted into the stem holder 52 using the master gauge 80. In this state, the floating unit 72 is fixed so as not to move in the X, Y, and rotation directions. Thus, the stem holder 52 is held at a predetermined reference position.

Next, the cathode ray tube 1 to be sealed and the electron gun 2
Are set in a sealing machine. The cathode ray tube 1 has a cone receiver 6
1 and the electron gun 2 puts its stem pin 21 into the stem holder 52. Thereby, the cathode ray tube 1
And the electron gun 2 are respectively positioned at reference positions determined by the master gauge 80.

At this time, (1) the cathode ray tube 1 is placed on the cone receiver 61 and the stem pin 21 of the electron gun 2 is inserted into the stem holder 52, and then the table unit 42 is raised to move the electron gun 2 to the neck. 1c and (2)
The cathode ray tube 1 is placed on the cone receiver 61 with the electron gun 2 inserted into the neck portion 1 c and temporarily fixed, and the table unit 42 is raised to open the holes 53 and 5 of the stem holder 52.
The position of the electron gun 2 is adjusted while the stem pin 21 of the electron gun 2 is inserted into the electron gun 4. More preferably, the latter general method is employed.

A measuring unit of the sealing accuracy measuring device 40, that is, a measuring device in the X direction, the Y direction, and the rotating direction is also provided in the sealing device, and the measurement is performed with the master gauge 80 incorporated. The position of the stem holder 52 may be fixed using the measured value obtained. With such a configuration, when sealing a plurality of types of cathode ray tubes 10, it is not necessary to incorporate the master gauge 80 every time the type is changed, and align the gauges based on the measured values. Thus, the position of the stem holder 52 can be fixed. Also,
A configuration in which the measured value of the master gauge 80 is stored in the memory and the positioning of the stem holder 52 is automated can be realized.

Further, for example, by making the measuring section and the heater detachable, a configuration can be adopted in which the sealing machine and the sealing accuracy measuring machine can be used together.

In the above embodiment, the stem 90 of the master gauge 80 has three stem pins 91A and 91A.
B and 91C are provided, but if three or more are used, stability is secured. If there is no problem in securing sealing accuracy and securing accuracy in sealing, a stem pin is attached to the master gauge.
More than this may be provided.

The present invention is not limited to the above-described embodiment, and may take various other configurations without departing from the gist of the present invention.

[0086]

According to the present invention, the strength of the stem pin of the master gauge can be improved by the large diameter portion, and the stem pin can be prevented from bending when the master gauge is used. Positioning can be performed with high accuracy by the thin portion of the. By measuring the sealing accuracy of the electron gun using the measured value of the master gauge positioned with high accuracy as a reference value, the measurement can be performed with higher accuracy. Therefore, according to the present invention, it is possible to improve the reproducibility and reliability of the measurement of the electron gun sealing accuracy of the cathode ray tube.

Further, since the stem pin of the master gauge can be inserted into the stem holder without bending, the length of the stem and the sealing length can be measured accurately with reference to the master gauge.

Further, according to the present invention, when the electron gun is sealed in the cathode ray tube, the electron gun is fixed at the position of the master gauge accurately positioned and the electron gun is sealed. Can be stopped.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of one embodiment of a color cathode ray tube to which the present invention is applied.

FIG. 2 is a schematic sectional view of the color cathode ray tube of FIG.

FIG. 3 is a schematic configuration diagram of A and B electron guns.

FIG. 4 is a schematic configuration diagram (front view) of a sealing accuracy measuring device for an electron gun.

FIG. 5 is a schematic configuration diagram (side view) of a sealing accuracy measuring device for an electron gun.

FIG. 6 is a schematic configuration diagram (plan view) of a sealing accuracy measuring device for an electron gun.

FIG. 7 is a front view of a table unit of the sealing accuracy measuring machine of FIGS. 4 to 6;

FIG. 8 is a side view of a table unit of the sealing accuracy measuring machine of FIGS. 4 to 6;

FIG. 9 is a plan view of a table unit of the sealing accuracy measuring machine of FIGS. 4 to 6;

FIG. 10 is a schematic configuration diagram of a master gauge. A It is a side view. It is the top view seen from the side corresponding to B panel part.

FIG. 11 is a schematic configuration diagram of a master gauge (other side view).
It is.

FIG. 12 is a schematic configuration diagram of a master gauge stem according to an embodiment of the present invention. A It is a side view. B is a plan view seen from the tip side of the stem pin.

FIG. 13 is an enlarged view of a stem pin of the stem of FIG.

FIG. 14 is a schematic configuration diagram of a stem holder according to an embodiment of the present invention. A is a plan view. B is a schematic cross-sectional view of a state where a stem pin is inserted. C
15B is a schematic cross-sectional view when the height to the reference plane is larger than that in FIG. 14B.

FIG. 15 is a view showing a main part of one embodiment of a sealing machine for an electron gun according to the present invention.

16A and 16B are schematic structural views of a stem at the tip of a conventional master gauge.

FIG. 17 is a schematic configuration diagram of a conventional stem holder. A is a plan view. B It is sectional drawing in PP 'of FIG. 17A. C It is sectional drawing in QQ 'of FIG. 17A. D is a schematic sectional view of the state where the stem pin is inserted.

[Explanation of symbols]

1 cathode ray tube, 2 electron gun, 3 color selection mechanism, 6 frame, 7 phosphor screen, 10 cathode ray tube, 11 electrode plate for color selection, 21 stem pin, 40 sealing accuracy measuring machine,
41 base, 42 table unit, 43 holder,
45 block, 46 dial gauge, 52 stem holder, 56 reference plane, 60 belt, 61 cone receiver, 62, 62X, 62Y pad part, 63 pressing unit, 71 main table, 72 floating unit, 73, 73X, 73Y (sealing Accuracy) measuring part,
74 table, 75 rotating unit, 76 rotary encoder, 80 master gauge, 82 base, 90 (master gauge) stem, 91, 91
A, 91B, 91C Stem pin (of master gauge)

Claims (7)

[Claims] 1. An apparatus for measuring the sealing accuracy of an electron gun sealed in a cathode ray tube before sealing the cathode ray tube, comprising: a support section for supporting the cathode ray tube; and the electron gun. Using a master gauge having at least three or more stem pins having a thick part on the base side and a thin part on the tip side as a measurement standard. An apparatus for measuring the sealing accuracy of an electron gun for a cathode ray tube, wherein the sealing accuracy is measured. 2. The electron gun seal according to claim 1, wherein a part of the hole of the stem holder has a shape corresponding to the thick part and the thin part of the stem pin of the master gauge. Accuracy measuring device. 3. An apparatus for sealing an electron gun in a cathode ray tube, comprising: a support portion for supporting the cathode ray tube; and a stem holder having a hole for inserting a stem pin of the electron gun. The position of the electron gun to be sealed is set using a master gauge having at least three or more stem pins having a thick portion on the base side and a thin portion on the tip side as a reference device. Gun sealing device for cathode ray tube. 4. A cathode ray tube according to claim 1, wherein a part of the hole of the stem holder has a shape corresponding to the thick part and the thin part of the stem pin of the master gauge. Gun sealing device. 5. A master gauge simulating the shape of a cathode ray tube and serving as a reference device for a sealing position of an electron gun, the master gauge having at least three stem pins at a tip end thereof, wherein the stem pins are at the base side. A master gauge characterized by a structure consisting of a thick part and a thin part on the tip side. 6. A master gauge simulating the shape of a cathode ray tube, having at least three or more stem pins at the distal end, and having a structure in which the stem pin has a thick portion at the root side and a thin portion at the distal side. By using as a reference device, by measuring the position of the electron gun sealed in the cathode ray tube body with respect to the measurement value of the master gauge, the sealing accuracy of the electron gun is measured. Electron gun sealing accuracy measurement method. 7. A master gauge which simulates the shape of a cathode ray tube, has at least three or more stem pins at the distal end, and has a structure in which the stem pin has a thick portion at the root side and a thin portion at the distal side. Is used as a reference device, the position of the electron gun is adjusted in accordance with the position of the master gauge, and after the step of fixing the electron gun, a step of sealing the electron gun in a cathode ray tube is performed. A method for manufacturing a cathode ray tube.