JPH05303941A - Panel for cathode-ray tube and manufacture thereof - Google Patents

Abstract

PURPOSE:To hold a shadow mask stably. CONSTITUTION:A panel 20 for a cathode-ray tube has a glass enclosure part 22 provided with a hollow part, and a support part 23 which is suitable for supporting load, and a stud pin 21 having a screw hole 24 at a peak part of the support part 23 is sealed to a glass wall in an inner side surface. For manufacturing the panel 20 for the cathode-ray tube, a temporary screw 25 as a threading material is threaded to the screw hole 24 of the stud pin 21 to cap it, and after the stud pin 21 is held by a vacuum chuck to be heated and sealed to the panel 20, the temporary screw 25 is removed from the screw hole 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel used for a cathode ray tube and a method for manufacturing the panel.

[0002]

2. Description of the Related Art As shown in FIG. 5, conventionally, a panel 10 for a cathode ray tube is sealed with a stud pin 12 for holding a shadow mask 11 on a glass wall on an inner surface thereof. Stud pin 12 holding shadow mask 11
Is press-formed from a thin plate material such as a stainless steel alloy as disclosed in, for example, Japanese Patent Publication No. 45-27183, and its shape is a support portion 13 and a panel for supporting the shadow mask 11 as shown in FIG. It has a glass enclosure 14 enclosed in 10 glass walls, and has a uniform thickness throughout. When the stud pin 12 is sealed to the glass wall, the stud pin 12 is held at the tip of the holder by a vacuum chuck, and is pressed into contact with the inner surface of the panel 10 while being heated by the high frequency induction heating device. Is softened, melted and sealed.
A spring plate 15 for fitting the shadow mask 11
The shadow mask 11 is held by fitting the fitting hole 16 of the spring plate 15 into the support portion 13 of the stud pin 12.

[0003]

By the way, the electron beam emitted from the electron gun of the cathode ray tube irradiates the fluorescent screen through a large number of small holes formed in the shadow mask,
Since the image is formed on the panel, the shadow mask needs to be attached to the panel with high dimensional accuracy.

However, in the conventional cathode ray tube panel, since the shadow mask is fitted to the support portion of the stud pin only by the spring pressing force of the spring plate, the holding state of the shadow mask is not stable, A slight deviation may occur in the position of the shadow mask with respect to the panel in the manufacturing process of the cathode ray tube. As a result, in a cathode ray tube manufactured using such a panel for a cathode ray tube, color unevenness or color misregistration occurs in an image, which causes a problem that a good image cannot be obtained.

Therefore, an object of the present invention is to provide a cathode ray tube panel capable of stably holding a shadow mask and a method for manufacturing the same.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and objects, and has a glass enclosing portion having a hollow portion and a supporting portion suitable for supporting a load, and The panel for a cathode ray tube is characterized in that a stud pin having a screw hole at the top of the supporting portion is sealed to a glass wall on an inner surface. In addition, after screwing a screwing material into the screw hole at the top of the support portion of the stud pin to plug the stud pin, the stud pin is held by a vacuum chuck and heated and sealed to the glass wall on the inner surface of the panel. The method for manufacturing a cathode ray tube panel is characterized in that the screw material is removed from a screw hole of a stud pin.

[0007]

In the cathode ray tube panel of the present invention, since the stud pin having the screw hole at the top of the supporting portion is sealed on the glass wall on the inner surface of the panel, the spring plate of the shadow mask is fitted when the shadow mask is fitted. The shadow mask can be reliably held by not only fitting the fitting hole of (1) to the support portion of the stud pin, but also screwing a screw from above onto the screw hole of the support portion via a pressing member or the like.

Further, according to the method of manufacturing a panel for a cathode ray tube of the present invention, a screw member is screwed into the screw hole at the top of the support portion of the stud pin to plug the stud pin, so that the stud pin is sealed when the stud pin is sealed. Since the stud pin can be securely held by the vacuum chuck of the pin holder, it can be sealed to the glass wall on the inner surface of the panel with high dimensional accuracy.

[0009]

EXAMPLES The cathode ray tube panel of the present invention and the method for producing the same will be described below with reference to examples.

FIG. 1 is a plan view of a cathode ray tube panel of the present invention, and FIG. 2 is a sectional view of a stud pin sealed to the cathode ray tube panel.

Four stud pins 21 for holding a shadow mask are sealed on the glass wall on the inner surface of the cathode ray tube panel 20. As shown in FIG. 2, the stud pin 21 has a glass-filled portion 22 having a hollow portion and a supporting portion 23 suitable for supporting a load, and a screw hole is provided at a top portion 23 ′ of the supporting portion 23. 24 is formed. The stud pin 21 is obtained by forging a metal material such as a stainless steel alloy, and then thread-forming the top portion 23 ′ of the support portion 23.

Next, a method of manufacturing the cathode ray tube panel 20 will be described with reference to FIG. FIG. 3 is an explanatory view showing the sealing of the stud pin 21 to the glass wall on the inner surface of the cathode ray tube panel 20. First, the provisional screw 25 is screwed into the screw hole 24 formed in the support portion 23 of the stud pin 21 so that the stud pin 21 is fixed to the stud pin holder 26.
It is securely held by the vacuum chuck at the tip of. Next, while heating the stud pin 21 in the magnetic field of the high-frequency induction heating device 27, the vicinity of the shoulder portion of the stud pin 21 located below the supporting portion 23 is intensively heated and transmitted to the glass sealing portion 22, This heated stud pin 21
The glass wall is softened, melted, and sealed by the conduction heat from.
After the sealing is completed, the temporary screw 25 screwed into the screw hole 24 of the support portion 23 of each stud pin 21 is removed. In the cathode ray tube panel 10 manufactured in this way,
Stud pin 2 with high dimensional accuracy on the inner glass wall
1 is sealed.

When attaching the shadow mask to the cathode ray tube panel 20, the fitting hole 30 of the spring plate 29 of the shadow mask 28 is fitted into the support portion 23 of the stud pin 21 as shown in FIG. Therefore, the shadow mask 28 can be reliably and stably held by screwing and tightening the screw 32 into the screw hole 24 of the support portion 23, for example, via the washer 31 serving as a pressing member.

[0014]

As described above, according to the panel for a cathode ray tube and the method of manufacturing the same of the present invention, the shadow mask can be stably held, and a screw hole is formed in the support portion for supporting the load of the shadow mask. There is an excellent effect that the stud pin having the above can be manufactured by sealing it to the glass wall on the inner surface of the panel with high dimensional accuracy using a vacuum chuck.

[Brief description of drawings]

FIG. 1 is a plan view of a cathode ray tube panel of the present invention.

FIG. 2 is a cross-sectional view of a stud pin sealed to a cathode ray tube panel of the present invention.

FIG. 3 is an explanatory diagram showing sealing of stud pins.

FIG. 4 is a perspective view showing how the shadow mask is attached to the cathode ray tube panel of the present invention.

FIG. 5 is a sectional view showing how a shadow mask is attached to a conventional cathode ray tube panel.

FIG. 6 is a sectional view of a stud pin sealed to a conventional cathode ray tube panel.

[Explanation of symbols]

 20 Panel for Cathode Ray Tube 21 Stud Pin 22 Glass Enclosed Part 23 Support Part 24 Screw Hole 25 Temporary Screw 28 Shadow Mask 32 Screw

Claims (2)

[Claims] 1. A stud pin having a glass enclosing portion having a hollow portion and a supporting portion suitable for supporting a load and having a screw hole at the top of the supporting portion is sealed in a glass wall on an inner surface. A cathode ray tube panel characterized by being worn. 2. A stud pin is provided with a screw member at the top of a support portion of the stud pin for screwing the plug into the screw hole, and the stud pin is held by a vacuum chuck and heated to seal the glass wall on the inner surface of the panel. A method for manufacturing a panel for a cathode ray tube, characterized in that the screw material is removed from the screw hole of the stud pin after the attachment.