JPH11185618A - Pin planting method for cathode-ray tube panel and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a planting method of a shadow mask support pin at a skirt part of a cathode-ray tube panel and a device. SOLUTION: A skirt part 106 of a panel 102 is supported using three or four support pads 124, 126, 128, 130 instead of supporting an inner surface of a face part of the panel 102 by means of a support post. Each support pad ascends and descends to be a fixed height by driving devices 136, 138, 156. First to forth distant measuring sensors 166, 168, 170, 172 are for measuring heights of corner points of the inner surface of the face part of the panel 102. Ascending or descending moving distances of the support pads flucturate according to the measured data. Before pushing in a support pin 114, a control device 164 controls driving devices so that measured corner points are within a specified standard plane. A curvature representative value can be automatically indicated by adopting a fifth distant measuring sensor to measure a height of the center point of the inner surface of the face part of the panel 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of implanting a metal shadow mask supporting pin on the inner surface of a skirt portion of a cathode ray tube panel, and an apparatus for realizing the method.

[0002]

2. Description of the Related Art A cathode ray tube used for manufacturing a color television or a computer monitor, for example, includes a panel 10, a funnel 12 and a neck 1 as shown in FIG.
4 is provided. The panel 10 includes a face portion 16 forming a screen of a cathode ray tube, and a skirt portion 18 adhered to the funnel 12.

[0003] On the inner surface of the face portion 16 of the panel 10,
A fluorescent material layer is applied so that an image is formed by the electron beam emitted from the electron gun 20. A metal plate-shaped shadow mask 22 having fine holes for selectively transmitting an electron beam is attached to the skirt portion 18 at a precise fixed distance from the inner surface of the face portion 16.

On the inner surface of the skirt 18 of the panel 10,
Three to four metal support pins or studs 24 for fixing and supporting the above-described shadow mask 22 are implanted.

In order for the cathode ray tube to provide a high-quality image, the shadow mask 22 must be properly arranged, and therefore, the implantation position of the pin 24 must be set extremely precisely. , Face part 1 of panel 10
No. 6 must be free from optical defects, such as foreign substances or scratches, and its inner surface curvature must be accurate. If the implantation position of the pin 24 is incorrect, the panel 10
In this case, it is impossible to maintain uniformity of the distance between the face portion 16 and the shadow mask 22, and the image quality deteriorates.

Generally, the panel 10 is made of a glass material of 15
It is manufactured by a method of melting in a high-temperature melting furnace at 00 ° C. and compression-molding the molten glass into a desired form. After the formed panel is cooled with air, it is sent to a pin implantation process by a conveyor, in which pins preheated to a high temperature are implanted in the panel. At the end of the pin implantation step, the panel is transferred to the refining step through the annealing furnace, and in this refining step, the face of the compact is smoothly refined.

The inner surface of the panel 10 is precision molded by a plunger-operating upper die in a compression molding process, and is not subjected to any processing steps thereafter. The cleanliness of the mold is strictly controlled.

[0008] The curvature of the inner surface of the face portion is 0.1 mm.
Although it should be maintained precisely within the allowable error range, the curvature may deviate from the allowable error due to mold wear, change in air cooling efficiency, etc., so after the pin implantation process is completed, it is transferred to the refining process. During this time, it was common practice to periodically sample the panel and measure the curvature with a hot end gauge. Referring to FIG. 2, panel 10 is shown with metal support pins 24 implanted within flange 18 of panel 10. The curvature representative value CC of the inner surface of the face portion 16 can be calculated as follows by measuring the height of the center point and the heights of two diagonal corner points as shown in FIG.

CC = HO- (HA + HB) / 2

In this equation, HA is the height of the first corner point A, HB is the height of the second corner point B, HO is the height of the center point C,
Each of these heights is a height measured from a reference plane in the extending direction of the support pin.

The curvature representative value CC is a representative value indicating the degree of shrinkage of the panel due to cooling of the press. In order to minimize the variation or dispersion of the panel dimensions, this value is always set to a predetermined reference value. It is very important to approximate. For this reason, the field worker adjusts the cooling temperature of the lower mold of the press as needed based on the measured curvature representative value CC to adjust the curvature.

As shown in FIG. 2, the step of implanting the pins 24 in the skirt portion 18 of the panel 10 is performed by a number of pin implanters arranged in front of the lehr and behind the press. 10 has been cooled to about 500 ° C. The reason for using such a large number of pin-implanting devices is to balance the speed of the pin-implantation with the compression molding speed of the panel. This pin implanter
The pin 24 is heated by high frequency induction heating, for example, to about 1200 ° C.
Preheated pins 24
Is pushed into the inner surface of the skirt portion 18 of the panel 10 by this pin implantation device.

FIG. 3 to FIG.
A conventional pin implanter for implanting in a skirt 18 of the present invention is shown schematically. The pin implanting device includes a fixed support 26 and a floating support 28 that support the inner surface of the face portion 16 of the panel 10 in cooperation with each other.
As shown in FIG. 4, the fixed support 26 moves upward from the fixed base 30 to support two corner points passing through the first diagonal line on the inner surface of the fixed base 30 and the face portion 16. The first and second support posts 32 and 34 are provided upright. On the other hand, as clearly shown in FIG. 5, the floating type support 28 has a fixed base 36 and a base 36 with a spring 38 interposed therebetween.
At the center thereof, a horizontal frame 40 which is swingably connected, and opposite ends of the horizontal frame 40 for supporting two corner points passing through a second diagonal line on the inner surface of the face portion 16. And the third and fourth support posts 42, 44 extending upward from the first and second support posts.

[0014] The conventional pin implantation device is a table 46.
And a plurality of heating and pushing devices 48 fixedly installed on the table 46 and heating the pins and then pushing the pins into the inner surface of the skirt portion 18. On the table 46, a pair of Y-axis direction guide pins 50 and a pair of Y-axis direction pressurizing devices 52 are installed so as to face each other, and one X-axis direction guide pin 54 and one X-axis direction The axial pressing device 56 is installed at a predetermined interval from each other. The Y-axis direction pressing device 52 includes a table 46.
The panel 10 disposed above is pressed against the Y-axis direction guide pins 50 and fixed. Similarly, the X-axis direction pressing device 56 has a function of pressing the panel 10 toward the X-axis direction guide pins 54 to fix the panel 10 at a predetermined position. Such pin implanters are well known in the art and are described, for example, in US Pat.
No. 497,339 is well described.

As described above, the pins 24 for supporting the shadow mask will adversely affect the quality of the cathode ray tube if the implantation positions are not accurate. FIG.
The conventional pin implantation device described with reference to FIG.
To ensure that the pin 24 is always in the correct position,
Are designed to be mounted on the support plane defined by the tips of the support posts 32, 34, 42, 44, and by using the pressurizing devices 52, 56, At a set distance, skirt 1
Prior to implanting the pins 24 in the panel 8, the panel 10 is designed to be secured against movement in said position. When viewed in an XY coordinate system with the center point of the panel 10 as the origin, the positions of the support posts 32, 34, 42, and 44 are
It is symmetric as follows.

A (−xp, yp) C (xp, yp) D (−xp, −yp) B (xp, −yp)

A and B show the panel contact points of the fixed support posts 32 and 34, and C and D show the floating support posts 42 and 44.
Shows the panel contact points.

In general, it is sufficient to provide three points or three conditions to form a plane. The four contact points A,
The post plane formed by B, C and D can be known by calculating the height of the contact points A and B and the gradient of the line connecting the contact points C and D. Assuming that the heights of the contact points A, B, C, and D are HA, HB, HC, and HD, the post-plane equation is expressed as follows.

[0019]

(Equation 1)

The three or four pins are implanted in the skirt 18 at a predetermined distance below the above-mentioned post plane. During the implantation of the pins 24, each support post 32, 34, 42, 44 holds the face 1 of the panel 10.
6 must be kept in contact with the inner surface for 20-30 seconds. Since the inner surface of the face portion 16 is used as a video screen, care must be taken to avoid scratches or cracks at the contact points of the posts. That is, when the temperature of the panel is too high when the panel is transferred from the pressing step to the pin implantation step, there is a possibility that a trace is generated by being pushed by the post. Conversely, if the panel is overcooled, cracks are likely to occur due to thermal shock.

In consideration of these problems, in the prior art of the panel manufacturing system, a long conveyor of 10 m or more is provided between the pressing step and the pin implantation step, and the panel is cooled to an appropriate temperature during the transfer. Like that.
Further, by installing a heater in the support post and keeping the temperature constant, the panel is prevented from cracking due to thermal shock. To improve durability, each support post is made of a heat and wear resistant material.

[0022]

According to the conventional pin implantation apparatus as described above, as the operation time elapses, traces or cracks are frequently generated by the panel being pushed by the control of process conditions. In addition, excessive cooling air is used to lower the temperature of the press mold and the temperature of the panel formed by the press to the appropriate level described above, so that the dimensional deviation between continuously formed panels only increases. Instead, a lot of noise will be generated.

Further, since a conveyor of 10 m or more is used to move the panel from the press device to the pin implantation device, there is a problem that the whole layout of the factory becomes long. To implant a pin in a cooled panel during transport 1
Since a long time of 5 seconds or more is required, in order to match the molding speed of the press with the pin implantation speed, a large number of pin implantation devices, for example, in the case of a 14-inch panel, six or more pin implantation devices are connected in parallel. Installation and operation are required. This results in a large automation device for transferring, feeding and removing the panels for pin implantation.

Further, the use of the support post for setting the position of the panel causes a problem that the configuration of the pin implanting device itself is complicated. Even if the manufacturing cost of the support post is excluded, at least a heater for keeping the temperature of the support post constant during the pin implantation process, a floating support for forming the post plane, and a gap between the panel and the support post. There is no choice but to require a Holddown device that pushes the panel from above to induce reliable contact. Therefore, the size of the pin implantation device is increased,
Complications are inevitable.

Further, as an inherent problem in the pin implantation apparatus, there is a need to improve a method of keeping the inner surface curvature of the panel constant. That is, the field worker transports the pin-implanted panel with a hot end gauge, measures the panel curvature representative value CC, and changes the cooling air flow rate supplied to the press based on this to change the lower air flow rate. The inner surface curvature of the panel is adjusted by controlling the mold temperature. Since the representative value of the curvature is manually measured sporadically, it is difficult to quickly and accurately detect the curvature error of each panel. To control the lower mold temperature of the press depending on the operator's discretion,
It is difficult to eliminate the deviation of the inner surface curvature of each panel.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to accurately set the vertical position of a panel without using a support post, An object of the present invention is to provide a pin implantation method and apparatus which can fundamentally prevent a defect such as a mark or a crack from being pressed against the inner surface of a panel by using a post.

Another object of the present invention is to provide a pin implantation method and apparatus capable of directly transferring a press-formed panel to a pin implantation step without intervening a cooling process such as a cooling conveyor. It is to provide.

It is another object of the present invention to reduce the time for pin implantation, reduce the likelihood of breakage in a subsequent lehr, and to enable the pin implantation process by allowing relatively hot panels to be directly introduced into the pin implantation process. It is an object of the present invention to provide a pin implantation method and apparatus capable of greatly reducing the number of pin implantation devices required in the above.

Still another object of the present invention is to automatically measure the representative value of the curvature of each panel continuously supplied to the pin implantation process, and to control the temperature of the press in a feedback manner according to the change in the curvature, thereby obtaining the inner surface of the panel. It is an object of the present invention to provide a pin implantation method and apparatus which ensures that the curvature is always maintained within an allowable error range.

[0030]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of implanting a shadow mask support pin into a cathode ray tube panel having a face portion and a skirt portion, wherein the skirt portion of the panel is supported at a plurality of support points. Supporting,
Measuring the height of the corner points on the inner surface of the face of the panel; determining whether each of the corner points coincides with a preset reference plane; and at least one of the corner points. If it is determined that one of the corners is deviated from the reference plane, the height of the skirt support point is changed to make each corner point coincide with the reference plane, and the shadow mask support is attached to the inner surface of the skirt of the panel. And a step of pushing a pin.

It is a further object of the present invention to provide a device for implanting shadow mask support pins in a cathode ray tube panel having a face portion and a skirt portion, wherein the table and the skirt portion of the panel are supported so as to be adjustable in height. A plurality of support pads installed on the table as described above, a driving means for vertically moving each of the support pads,
A first to a fourth panel mounted on the table to measure the height of a corner point on the inner surface of the face of the panel.
Distance measuring sensor, determine whether each corner point measured by the distance measuring sensor coincides with a preset reference plane, if at least one corner point is shifted from the reference plane, A cathode ray tube panel comprising: control means for operating the driving means to move the corner point on a reference plane; and means for pushing the shadow mask support pins into the inner surface of the skirt portion of the panel. This can be achieved with a pin implanter.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS.

First, FIGS. 6 to 9 are a plan view and a sectional view of a pin implantation apparatus according to a first embodiment of the present invention. As shown in the figure, the pin implantation apparatus includes a table 100 on which a panel 102 transferred from a press forming process is placed. The panel 102 has a convex face portion 104 and a skirt portion 106 extending downward from an edge of the face portion 104. It should be understood that the pin implanter of the present invention can be used for a panel having a flat face as well.

On the upper surface of the table 100, first to third
Pin heating press devices 108, 110 and 112 are provided. Each pin heating press device 108, 110, 1
In a step 12, a pin 114 supplied from a pin feeder (not shown) is heated to a predetermined temperature by using, for example, a high-frequency current or the like, and then pressed against the inner surface of the skirt portion 106 of the panel 102. FIG. 6 shows three pin heating / pressing devices. However, four pin heating / pressing devices can be provided, and one pin 114 can be pressed into each side of the skirt portion 106.

On the table 100, a pair of Y-axis direction guide pins 116 and a pair of Y-axis direction pressurizing devices 118 are installed so as to face each other, and one X-axis direction guide pin 120 and one X-axis direction The direction pressing device 122 is installed so as to face each other. The Y-axis direction pressurizing device 11
Reference numeral 8 serves to press the panel 102 against the Y-axis direction guide pins 116 to fix the panel 102 in the Y-axis direction. Similarly, the X-axis direction pressing device 122 includes:
The panel 102 is pressed against the X-axis direction guide pins 120 to fix the panel 102 in the X-axis direction. Such a Y-axis pressing device 118 and an X-axis pressing device 122 may be a solenoid, a pneumatic cylinder, or any other suitable actuator. Alternatively, the panel 102 may include the skirt 1
It is also possible to use a pair of X-axis direction roller pressing devices and a pair of Y-axis direction roller pressing devices symmetrically arranged on the table 100 toward the inner surface of the fixing device 06 to fix the inner surface. When such a roller pressing device is used, the height can be adjusted after first fixing the panel 102 in the X-axis and Y-axis directions.

On the other hand, the table 100 has a panel 1
02 for supporting the skirt portion 106 of FIG.
Independently adjustable support pads 124, 126, first and second
The skirt portion 1 is provided with the interlocking adjustable support pads 128 and 130.
06 are respectively assembled at positions corresponding to the four corners so as to be able to move up and down. As clearly shown in FIG.
And the second independently adjustable support pads 124, 126
It is arranged diagonally opposite and always has a spring 13
2, 134 downward.

In order to move the support pads 124 and 126 up and down, the first and second driving devices 136 and 13 are used.
8 is used. The first drive device 136 includes an output shaft 142
Stepper motor 140 having
And a cam 144 attached to the tip of the camera. Since the cam 144 is in contact with the bottom surface of the first independently adjustable support pad 124, the support pad 124 is moved up and down by forward or reverse rotation of the stepping motor 140, and the height of the pad is adjusted to a desired value. You. Similarly, the second driving device 138 includes the stepping motor 1 having the output shaft 148.
46, and a cam 15 mounted on the tip of the output shaft 148.
It consists of 0. Since the cam 150 is in contact with the bottom surface of the second independent support pad 126, the height of the support pad 126 is adjusted to a desired value by the rotation of the stepping motor 146.

As shown in FIG. 8, the first and second interlocking adjustable support pads 128 and 130 are connected to each other by a tilt lever 152 extending over a second diagonal that intersects the first diagonal. I have. The tilt lever 152 has a support spring 1 at its center.
It is swingably supported by the table 100 via 54. Each interlocking adjustable support pad 128, 130 is biased downward by springs 129, 131.
Therefore, when the first interlocking and adjusting support pad 128 is raised by a predetermined distance, the second interlocking and adjusting support pad 130 is lowered in proportion thereto. Below the first interlocking support pad 128, a third driving device 156 is provided. The third driving device 156 is connected to the output shaft 16.
0 and the output shaft 1
60, and a cam 162 mounted at the tip end. Since the cam 162 is in contact with the bottom surface of the first interlocking adjustable support pad 128, the first interlocking adjustable support pad 128 is rotated by the forward or reverse rotation of the stepping motor 158.
Is raised or lowered to a desired height, and at the same time, the second interlocking adjustable support pad 130 moves in the opposite direction in proportion to the displacement of the first interlocking adjustable support pad 128.

The first to third driving devices 136 and 13
8, 156 stepping motors 140, 146, 15
The operation of 8 is appropriately controlled by a controller 164 that stores a reference plane on which the panel 102 is placed. Unlike the embodiment of the drawings, each of the support pads may be moved up and down using appropriate driving means, such as a pneumatic cylinder, a hydraulic cylinder, or a stepping motor and a ball screw operatively connected thereto. And these must also belong to the technical scope of the present invention.

Referring again to FIG. 6, the table 10
0, the first to fourth distance measuring sensors 16 to measure the height of the inner surface of the face portion 104 of the panel 102.
6, 168, 170, and 172 are provided corresponding to the four corner points on the inner surface of the face portion 104. First
And fourth distance measuring sensors 166, 168, 170, 1
72 measures the height of the corresponding corner point on the inner surface of the face portion 104, and measurement data of this height is sent to the control device 164. This control device 164
It is determined whether each measured corner point is located on the reference plane. If any one or more corner points deviate from the reference plane, the control 16
6, 158, each support pad 124, 126,
Adjusting the height of 128, 130 ensures that all corner points are located on the reference plane. As the distance measuring sensors 166, 168, 170, and 172, an optical non-contact sensor is excellent, but a contact-type sensor may be used if no trace is generated on the panel surface due to the contact pressure. Whatever the sensor,
Because it always comes in contact with or close to hot glass,
The sensor must be manufactured from a material with high heat resistance or must be cooled by a suitable cooling device.

Next, the operation of the pin implanting device according to the first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 14, first, step 1
In (S1), the panel 102, which has been compression-molded by a press (not shown), is transferred to the pin implanter, and the first and second independently adjustable support pads 124 and 126 and the first and second adjustable support pads 124 and 126 are provided.
It rests on the interlocking adjustable support pads 128,130. After the panel 102 is placed on the support pads 124 and 126, in step 2 (S2), each of the distance measurement sensors 166, 168, 170 and 172 adjusts the height of the four corner points on the inner surface of the face portion 104. The measured data is sent to the control device 164.

In step 3 (S3), the controller 1
Reference numeral 64 determines whether or not the measured position of each corner point is within a reference plane stored in advance. If it is within the reference plane, step 5 (S5) and step 6
The process proceeds to (S6), and if the height of at least one corner point is out of the reference plane, step 4 (S6)
The process returns to step 2 (S2) via 4). Step 4
In (S4), the stepping motors 140, 14
6, 158 to activate each support pad 124, 126,
By adjusting the height of 128, 130, the panel 1
02 is placed on the reference plane. Each support pad 124, 126, 128, 130
Is determined as follows. Panel 102
When viewed in an XY coordinate system having the center point as the origin, the horizontal and vertical positions a, b, c, and d of the support pads 124, 126, 128, and 130 are defined as follows.

A (−xs, ys) c (xs, ys) d (−xs, −ys) b (xs, −ys)

Assuming that the heights of the support pads at the horizontal positions a, b, c, and d are Ha, Hb, Hc, and Hd, the plane equation z of the support pads can be expressed as follows.

[0045]

(Equation 2)

Using the above equation, the heights z (A) and z (B) of the pad plane at the first and second corner points of the panel 102 and the height z (B) of the pad plane at the third and fourth corner points. C) -z (D). If the heights HA, HB and the height difference (HC-HD) of the four corner points of the panel 102 do not match the values HAO, HBO, (HC-HD) O defining the reference plane, the respective support pads 124, 12
6, 128, 130 must be raised and lowered. First
And when the height of the second independently adjustable support pads 124 and 126 changes by ΔHa and ΔHb, and the height of the first and second interlocking support pads 128 and 130 changes by Δ (Hc−Hd), Corner point height change Δz (A),
Δz (B) and Δz [(C)-(D)] are determined by the above equations. Therefore, the vertical movement amount of the support pad is HAO-HA, HBO-HB and (HC-HD) O
-(HC-HD). By moving the support pad up and down by this value, the four corner points of panel 102 coincide with the reference plane.

When the vertical position of the panel 102 is determined by the above-described method, in step 5 (S5), the Y-axis pressing device 118 operates to fix the panel 102 in the Y-axis direction. The axial pressing device 122 operates to fix the panel 102 in the X-axis direction. Finally, in step 6 (S6), the pin heating and pushing devices 108, 110, and 112 are operated to change the pins 114 supplied from a pin supply device (not shown) to, for example, 1200.
After heating to ° C., it is pushed into the skirt portion 106 of the panel 102. Implanted panel 102 with pins 114
Is moved to a lehr and cooled.

FIGS. 10 and 11 show a pin implantation apparatus according to a second embodiment of the present invention as a plan view and a sectional view. The pin implanting device of the second embodiment includes first to third independently adjustable support pads 202, 204, and 206, and first to third driving devices 208 for independently moving the support pads 202, 204, and 206 up and down. , 210, 21
2, except that it has the same configuration as the above-described pin implantation device of the first embodiment. That is, the pin implanting device of the first embodiment is a four-point support system, while the implanting device of the second embodiment is a three-point support system. Therefore, among the components of the pin implanting device of the second embodiment, components having the same shape and the same function are assigned the same reference numerals as those of the first embodiment, and the detailed description thereof will be omitted.

In the pin implantation device of the second embodiment, the first, second, and third support pads 202, 204, 206
Are arranged at approximately equal intervals over the lower edge of the skirt portion 106 in order to stably support the panel 102 at three points. Each of the support pads 202, 204, and 206 is connected to the first to third driving devices 20.
8, 210, 212, the operation of the driving devices 208, 210, 212 is controlled by the control device 164 based on input data from the first to fourth sensors 166, 168, 170, 172. As clearly shown in FIG. 11, the first driving device 208
The output shaft 216 includes a stepping motor 214 and a cam 218 mounted on the output shaft 216. The cam 218 is in contact with the bottom surface of the first support pad 202. The first support pad 202 always has the spring 22
It is biased downward by 0. Like the first driving device 208, the second and third driving devices 210 and 212 include stepping motors 222 and 224 for raising and lowering the corresponding support pads 204 and 206, respectively.

Since the pin implanting device of the second embodiment having the above-described configuration supports the panel 102 at three points, the first embodiment employs a method of adjusting the height of the support pads 202, 204, and 206. It is different from the pin implantation device. That is, in FIG. 14, steps S1, S
Steps S2, S3, S5 and S6 are the same as those in the first embodiment, and only step S4 is executed by a different method. The vertical movement amount of the first to third support pads 202, 204, 206 is
It is determined as follows.

In the XY coordinate system, the support pad 20
The positions a, b and c of 2, 204 and 206 are respectively (x
a, ya), (xb, yb), (xc, yc), and the heights thereof are Ha, Hb, Hc, the plane equation of the pad is as follows.

Z = [｛(xb * yc−xc * yb) −
(Yc-yb) * x + (xc-xb) * y @ * Ha +
｛-(Xa * yc-xc * ya) + (yc-Ya) * x
− (Xc−xa) * y｝ * Hb + ｛xa * yb + xb *
ya)-(yb-ya) * x + (xb-xa) * y｝ *
Hc] / NN = (xb * yc + xc * ya * yb)-(xc * yb
+ Xb * ya + xa * yc)

When the height of each pad 202, 204, 206 changes by ΔHa, ΔHb, ΔHc, the height change Δz (A) of the pad reference plane at the position corresponding to the distance measuring sensors 166, 168, 170, 172. ), Δz (B),
Δz (C) and Δz (D) are represented by ΔHa, ΔHb,
It can be calculated by a function of ΔHc. These are exactly the height changes of the four corner points of the panel 102. Current corner point heights HA, HB and HCD (=
HC-HD) are equal to the reference values HAO, HBO and H
If they are off the CDO, to move them to the reference plane, the following equation:

Δz (A) = HAO−HA Δz (B) = HBO−HB Δ (z (C) −Δz (D)) = HCDO−HDO

Should be satisfied. The above equations are organized into the following simultaneous equations.

[0056]

(Equation 3)

In this equation, a1, a2, a3, b
1, b2, b3, c1, c2, c3 and ΔA, ΔB, Δ
CD, N, etc. are constant values that are arranged in the calculation process, and by finding the solution, the height Δ of the pad to be moved Δ
Ha, ΔHb, and ΔHc can be determined.

As described above, when the amount of vertical movement of the support pad is determined, the control device 164 controls the stepping motors 21 of the first to third driving devices 208, 210 and 212.
4, 222, 224 to activate each support pad 20
By moving 2, 204, 206 to a predetermined height, the panel 102 can be accurately arranged on the reference plane.

FIGS. 12 and 13 show a pin implantation apparatus according to a third embodiment of the present invention as a plan view and a sectional view, respectively. The pin implantation device according to the third embodiment is different from the pin implantation device in that a fifth sensor 302 for measuring the height of the center point of the panel 102 is installed at the center of the table 100 and a display device 304 is connected to the control device 164. Except for this, it has the same configuration as the pin implantation device of the first embodiment described above. Therefore, the same components as those of the pin implantation device of the first embodiment are denoted by the same reference numerals,
Detailed description is omitted.

The fifth distance measuring sensor 302 detects two diagonal corner points and the height of the center point in cooperation with the first and second sensors 166 and 168 or the third and fourth sensors 170 and 172. Control device 1
Enter 64. Accordingly, the control device 164 calculates a representative value of the curvature of the inner surface of the face portion 104 of the panel 102, which is displayed by the following equation.

CC = HO- (HA + HB) / 2

In this equation, HA, HB, and HO mean the height of the diagonal corner point and the height of the center point of the face portion 104 of the panel 102, respectively.

The representative value of the curvature calculated in this manner indicates the degree of shrinkage of the panel 102 due to the temperature of the press.
Displayed externally by the display device 304. or,
The curvature representative value is fed back to a press cooling device (not shown) to control the device. In other words, if the curvature representative value is larger than the reference value, the panel is excessively shrunk, and the press cooling device increases the temperature of the press, while if the curvature representative value is smaller than the reference value, Since the panel is too shrunk, the press cooling device lowers the temperature of the press. This ensures that the curvature of the manufactured panel is substantially uniform. The calculation of the representative value of the curvature is automatically performed for all the panels continuously supplied to the pin implantation apparatus from the pressing process.

[0064]

As described above in detail, according to the pin implanting device of the present invention, by removing the support post supporting the inner surface of the face portion of the conventional panel, the panel is implanted during the pin implantation process. Pressing marks or cracks can be prevented from occurring, and the yield can be improved. In addition, since there is no need to use a floating support that occupies a large volume, a hold-down device, a support post heating device, etc.,
The overall structure of the pin implantation device can be simplified.

Further, since there is no possibility that the post causes a pressing mark, it is not necessary to cool the panel to a specific temperature. Therefore, it is not necessary to cool the panel after press molding on the conveyor, and the panel can be directly transferred to the pin implanter, so that the conveyor can be removed and the plant area of the factory can be reduced. .

Further, since the pins are implanted in the panel at a relatively high temperature, the number of machines can be reduced by shortening the implantation time. In addition, by sending a relatively high-temperature panel from the pin implantation device to the lehr, it is possible to prevent the panel from being damaged by a large temperature difference in the lehr.

Further, by automatically monitoring the representative values of the curvatures of all the panels continuously supplied from the pressing step, it is possible to immediately remove the causes of the variation and dispersion of the panel dimensions. The representative value of the curvature is fed back to the press cooling device, and the mold temperature of the press can be automatically controlled.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a structure of a cathode ray tube having a metal support pin for supporting a shadow mask.

FIG. 2 is an enlarged sectional view showing a state in which a shadow mask supporting pin is implanted in a panel of the cathode ray tube shown in FIG.

FIG. 3 is a schematic plan view showing a prior art panel pin implanter with a panel mounted.

FIG. 4 is a cross-sectional view taken along the line IV-IV of FIG. 3, showing the panel supported by a set of fixed support posts.

5 is a cross-sectional view taken along line VV of FIG. 3, showing the panel supported by a pair of floating support posts.

FIG. 6 is a plan view showing a pin implanting device for a cathode ray tube panel according to a first embodiment of the present invention.

FIG. 7 is a sectional view taken along line VII-VII of FIG. 6;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a sectional view taken along line IX-IX of FIG. 6;

FIG. 10 is a plan view showing a pin implantation apparatus for a panel for a cathode ray tube according to a second embodiment of the present invention.

FIG. 11 is a sectional view taken along line XI-XI of FIG. 10;

FIG. 12 is a plan view showing a pin implanting device for a cathode ray tube panel according to a third embodiment of the present invention.

FIG. 13 is a sectional view taken along line XIII-XIII of FIG.

FIG. 14 is a flowchart showing various steps of setting a panel position and implanting pins using the pin implanting device of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 table 102 panel 104 face portion 106 skirt portion 108, 110, 112 heating press device 114 pin 116 Y-axis guide pin 118 Y-axis press device 120 X-axis guide device 122 X-axis press device 124, 126 independent Adjustable support pad 128,130 Interlocking adjustable support pad 129,131,132,134 Spring 136,138,156 Drive 140,146,158 Stepping motor 142,148,160 Output shaft 144,150,162 Cam 152 Tilt lever 154 Support spring 156 Driving device 164 Control device 166, 168, 170, 172 Distance measuring sensor 202, 204, 206 Independently adjustable support pad 208, 210, 212 Driving device 214, 222, 22 Stepping motor 216 output shaft 218 cam 220 spring 302 sensor 304 display

Continuation of the front page (71) Applicant 598010942 472, Shin-dong, Paldal-gu, Suwon-si, Kyungki i-do, Republic of Korea (72) Inventor Kim Moon Lee Republic of Korea Paldaluk, Mampo-dong, Sehaeung Apartment 302 (72) Inventor Dae-yong Kim South Korea Seoul, Kuwanakug, Bonchoen-10-dong 56-91 (72) Inventor Seong Jin Jeon South Korea Gyeonggi-do, Yongin -Shi, Suji-Eup, Pundukchion-Li 699, Hanuk Apartment 101-802

Claims (14)

[Claims] 1. A method for implanting a shadow mask support pin into a cathode ray tube panel having a face portion and a skirt portion, wherein the skirt portion of the panel is supported at a plurality of support points, and a corner of an inner surface of the face portion of the panel. Measuring the height of the points; determining whether each of the corner points is coincident with a preset reference plane; and at least one of the corner points being displaced from the reference plane. If it is determined, the method includes a step of changing the height of the skirt support point to make each corner point coincide with a reference plane, and a step of pushing the shadow mask support pin into the inner surface of the skirt of the panel. A method of implanting pins in a panel for a cathode ray tube, characterized in that: 2. The method according to claim 1, wherein the skirt portion of the panel is supported at three support points. 3. The method according to claim 1, wherein the skirt portion of the panel is supported at four support points. 4. The method according to claim 1, wherein the step of measuring the height of the corner point is performed by four distance measuring sensors installed below each corner point. Pin implantation method for cathode ray tube panel. 5. The method according to claim 2, wherein the heights of the three support points are adjusted independently of the others. 6. The four support points are first and second independently adjustable support points disposed along a first diagonal of the panel, and a second support point disposed along a second diagonal that intersects the first diagonal. 4. The method according to claim 3, further comprising a first and a second interlocking support point. 7. The method according to claim 1, further comprising measuring a height of a center point on an inner surface of the face of the panel. 8. The cathode ray tube panel according to claim 7, further comprising a step of substituting the height of the corner point and the height of the center point into the following equation to calculate a representative value of curvature. How to implant. CC = HO− (HA + HB) / 2 In the above equation, HA, HB, and HO are the heights of the corner points on both sides and the center point on one diagonal, respectively. 9. The method according to claim 1, further comprising fixing the panel in the X-axis direction and the Y-axis direction, wherein the fixing step is performed before the pressing step. Pin implantation method for CRT panel. 10. An apparatus for implanting a shadow mask support pin into a cathode ray tube panel having a face portion and a skirt portion, wherein the table is installed on the table so as to support the skirt portion of the panel in a height-adjustable manner. A plurality of support pads, a driving unit for vertically moving each of the support pads, and a first to a second set on the table for measuring the height of a corner point on the inner surface of the face of the panel. 4
Distance measurement sensor, determine whether each corner point measured by the distance measurement sensor coincides with a preset reference plane, if at least one corner point is deviated from the reference plane, the Control means for operating the driving means to move the corner point on the reference plane; and means for pushing the shadow mask support pin into the inner surface of the skirt portion of the panel. Pin implantation equipment for cathode ray tube panels. 11. The panel of claim 1, wherein the plurality of support pads are a first of a panel.
It comprises first and second independently adjustable support pads arranged along a diagonal line, and first and second interlocking adjustable support pads arranged along a second diagonal line intersecting the first diagonal line. The pin implantation device for a panel for a cathode ray tube according to claim 10, characterized in that: 12. The first and second interlocking adjustable support pads are connected to each other by a tilt lever, and the tilt lever is pivotally supported by the table at a center thereof via a support spring. The pin implantation apparatus for a panel for a cathode ray tube according to claim 11, wherein: 13. The plurality of support pads include first to third independently adjustable support pads movably mounted on a table to stably support a skirt portion of the panel. The pin implanting device for a panel for a cathode ray tube according to claim 10, characterized in that: 14. The apparatus according to claim 10, further comprising a fifth distance measuring sensor installed on the table so as to measure a height of a center point on an inner surface of the face of the panel. Pin implantation equipment for cathode ray tube panels.