JPS62110238A - Shadow mask type color picture tube - Google Patents

Abstract

PURPOSE:To prevent a shadow mask body structure from being damaged, by making a bending part so as not to be installed at the mask frame side of a frame support body. CONSTITUTION:This color picture tube is provided with a panel 11 formed with a phosphor screen 12 on its inner surface, a shadow mask 13 proximately set up in this phosphor screen 12, a mask frame 14 supporting the shadow, mask, and an extension part 16 existing in the central part of aside wall 141 of the mask frame 14, extending in the opposite direction to the shadow mask 13 from an end part of this side wall 141, and being tilted in a tube axis direction. And, it consists of a frame support body 15 whose one end is welded to the extension part 16, and no bending part in and around this welding point, and engaging the extension part 16 and the mask frame 14 with a panel pin 17 on an inner surface of the side wall 111 of a panel 11 via an engaged hole part 15a and a neck 18 where an electron gun 19 emitting an electron beam 20 is sealed in.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a shadow mask type color picture tube.

[Technical background of the invention and its problems]

An example of a conventional shadow mask type color picture tube will be explained with reference to FIG.

In other words, a phosphor screen consisting of three color phosphor layers of red, green, and blue on the inner surface■
A panel ■ on which has been deposited, a shadow mask ■ placed at a predetermined interval on this phosphor screen ■, a mask frame supporting this shadow mask ■), and a mask frame) attached to the panel ω side. It consists of a frame support body 0 that is engaged with a panel pin (2) provided on the inner surface of u(1,), and an electron gun (9) enclosed in the neck 0.

In the manufacturing process of this shadow mask type color picture tube, a shadow mask structure consisting of a mask frame (2) and a frame support (2) that supports the shadow mask (2) is constructed, and then this shadow mask structure is attached to the frame support (2). The stabilizing process is performed in a state where the panel pin (3) is locked through the stop hole (5a). After that, the phosphor screen (■) is formed, but during the process of forming the phosphor screen (■), it is necessary to attach and detach the shadow mask structure from the panel pin (■).
Therefore, in order to improve the spring action, the frame support (2) has a first bent part (5,) and a second bent part (5,) on the side of the mask frame (to) and the side of the panel pin (2), respectively. (5,) is formed.

After the phosphor screen (2) is formed, an electron gun (9) is enclosed in the neck (8), and after various steps such as sealing, evacuation, and aging, a shadow mask type color picture tube is completed.

In this shadow mask type color picture tube, the phosphor screen ■
In order to reproduce a good image, the relative positions of the large number of holes in the shadow mask ■ and the corresponding phosphor layer of the phosphor screen ■ must be aligned, and the light passing through the holes must be aligned. It is necessary for the electron beam (lO) to accurately land on a predetermined phosphor layer.

However, as mentioned above, the frame support 0 has a spring action, so when a strong external force such as shock or vibration is applied to the shadow mask type color picture tube, the holes in the shadow mask ■ and the phosphor screen ■ The alignment relationship is broken and image disturbances such as color unevenness occur.

In particular, this is because shadow mask type color picture tubes used for applications such as pre-vision devices and display monitors mounted on automobiles and aircraft are continuously subjected to external forces such as strong shocks and vibrations due to the installation environment. There was a serious problem that the shadow mask structure was damaged and images could not be reproduced. [Object of the Invention] The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a shadow mask type color picture tube whose shadow mask structure is not damaged even when external forces such as strong shocks and vibrations are continuously applied.

[Summary of the invention]

That is, the present invention provides a panel having a phosphor screen made of phosphor layers of three colors red, green, and blue adhered to its inner surface, a shadow mask disposed close to the phosphor screen, and a mask supporting the shadow mask. A shadow mask type color picture tube comprising at least a frame and a frame support for supporting the mask frame on a panel pin, characterized in that the frame support is not provided with a bent portion on the mask frame side. It is a mask-shaped color picture tube.

In other words, in experiments conducted by the proponents, when external forces such as strong shocks and vibrations are continuously applied to conventional shadow mask type color picture tubes, the reason why images cannot be reproduced is due to This is often due to breakage at the bend in No. 1. The reason why the first bent portion of the frame support near the mask frame side is broken is considered to be as follows.

First of all, during the bending process, the crystal grains in those portions, including the first bent portion and the second bent portion, are deformed and become smaller. Therefore, it has been found that this is because oxides permeate into the frame support along the crystal grains during the stabilization process, which is normally carried out in an oxidizing atmosphere.

Next, we confirmed through various experiments and considerations why the first bent part is particularly prone to breakage among the first bent part and the second bent part, which are also bent. .

That is, when an external force such as a strong shock or vibration is continuously applied to the shadow mask type color picture tube, this external force is transmitted from the panel to the panel pin to the frame support to the mask frame. At this time, since the panel pin is installed on the inner surface of the side wall of the panel, the external force is directly transmitted to it, but the mask frame has a spring action and is attached to the second bent part and the first bent part. Since the external force is transmitted through the frame support, a difference in vibration occurs between the panel pin and the frame support, and this vibration difference applies force to the frame support.

In this case, the distance between the second bent part on the locking hole side of the frame support and the locking hole is equal to the distance between the first bent part of the frame support on the mask frame side and the welding point to the mask frame. It is longer than the interval between the two, and is fixed by welding to the mask frame, but not to the panel pin.

It is simply locked at the locking hole. In other words, since the frame support body is not fixed in the locking hole portion, the force applied to the second bent portion on the side that is locked with the panel pin is relaxed.

Due to the external force applied to the shadow mask type color picture tube for the above-mentioned reasons, it is considered that the first bent portion of the frame support on the mask frame side breaks.

[Embodiments of the invention]

An embodiment of the shadow mask type color picture tube of the present invention based on the above idea will be described with reference to FIGS. 1 to 3.

That is, a panel (11) having a phosphor screen (12) made of a phosphor layer that emits light in three colors of red, green, and blue adhered to its inner surface.
, a shadow mask (13) disposed close to this phosphor screen (12), a mask frame (14) that supports this shadow mask (13), and this mask frame (14).
) of the side wall (141), and the side wall (14
1), which is formed to extend from the end of the shadow mask (13) in a direction opposite to the shadow mask (13) and at an angle in the tube axis direction, and one end of which is welded to the extension part (16). , and there is no bend near the welding point, and this extension (1
6) and mask frame (14) into the panel bin (17) on the inner surface of the side wall (111) of the panel (11).
5a) and a neck (18) in which an electron gun (19) that emits an electron beam (20) is enclosed. That is, in this embodiment, the bent portion (152) is provided only in the locking hole portion (15a) of the frame support (15).

By using such a frame support (15), even if a strong external force is applied to the shadow mask type color picture tube, the mask frame (14) of the frame support (15)
) The frame support body (15) will not break because there is no part on the side where the mechanical strength is deteriorated and is weak against external forces. Furthermore, in this embodiment, the mask frame (14) is provided with an extension part (16) that is inclined in the tube axis direction, and the frame support (15) is welded and fixed to the inclined part of this extension part (16). This frame support (15)
Although it has a structure in which there is no bent part on the mask frame (14) side, it has the same springing effect as a conventional frame support.

In this case, since the external force applied to the bent portion (15□) on the side of the locking hole (15a) is small, the bent portion (15
□) is of course acceptable.

Further, in the above embodiment, the distraction portions (16) are provided at the center of the four sides of the mask frame (14), but the present invention is not limited to this, and the structure of the distraction portions is not limited to, for example, four sides. It may be provided at four diagonal parts other than the central part, or the part where the mask frame (14) and frame support (15) are welded is inclined in the tube axis direction without providing the extension part (16). Alternatively, the frame support may be a leaf spring without a bent portion.

〔Effect of the invention〕

According to the present invention, the present invention provides a shadow mask type color picture tube which is particularly suitable for use in automobile towers and aircraft towers, and has an extremely good property that the frame support does not break even under continuous strong external force. Can be provided.

[Brief explanation of drawings]

Figure 3 is an explanatory sectional view showing an embodiment of the shadow mask type color picture tube of the present invention, Figure 2 is a perspective view of the shadow mask structure, and Figure 3 is an explanatory sectional view of the main part of Figure 1. , 4th
The figure is an explanatory cross-sectional view of a conventional shadow mask type color picture tube. l, 11...Panel 1. ．． 11. ...Panel side wall 2.12-・Fluorescent screen 3,13...
Shadow Mask 4.14・Mask Frame

Claims (1)

[Claims] (1) A panel having a phosphor screen formed from three colored phosphor layers of red, green, and blue on its inner surface, a shadow mask disposed close to the phosphor screen, and a mask frame supporting the shadow mask; A shadow mask type color picture tube comprising at least a frame support that supports the mask frame on a panel pin, wherein the frame support is not provided with a bent portion on the mask frame side. Shape color picture tube.