JPH03280332A - Color image receiving tube - Google Patents

Abstract

PURPOSE:To prevent generation of a large bend at the boundary of the detaining part of a frame holder with the coupling part even though a force is applied to the detaining part by furnishing a reinforcing part at the boundary, and thereby making the spring constant of the boundary greater than the spring constant on the fixed side of the boundary. CONSTITUTION:A reinforcing member 28 is installed at the boundary of the detaining part 24 of a frame holder 22 with the coupling part 26, and thereby the spring constant of the boundary is made greater than the spring constant on the fixed side 25 of the coupling part 26. Accordingly the bend willing to lessen the angle theta at this detaining part 24 boundary with coupling part 26 is suppressed even though a force F in the direction of arrow 18 is applied to the detaining part 24 when a shadow mask 4 is to be mounted on or removed from a panel 1, and the flexural stress is concentrated on the fixed part 25 side of the coupling part 26, and thus a holder 22 can be bent chiefly on the fixed part 25 side of the coupling part 26. Therefore, the boundary can be bent so as to go apart from a stud pin 21, which is thus prevented from damage due to collision of the boundary with the pin 21 as well as the shadow mask prevented from incapability of being mounted and dismounted due to collision of the pin 21.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a shadow mask type color picture tube, and more particularly to a color picture tube with improved means for supporting the shadow mask.

(Prior Art) In general, a shadow mask type color picture tube includes a rectangular panel (1) and a rectangular panel (1) as shown in FIG.
It has an envelope consisting of a funnel-shaped funnel (2) integrally joined to the panel (1), and faces a phosphor screen (3) consisting of a three-color phosphor layer formed on the inner surface of the panel (1). Closer to it, a shadow mask (4) is attached inside it. This shadow mask (4) consists of a mask body (5) in which a large number of electron beam passage holes are formed and a mask frame (6) that supports the peripheral portion of the mask body (5). Further, an electron gun (8) is disposed within the neck (7) of the funnel (2). The three electron beams (9) emitted from the electron gun (8) are deflected horizontally and vertically by the magnetic field of a deflection yoke (lO) attached to the outside of the funnel (2). The structure is such that a color image is displayed by scanning the phosphor screen (3) horizontally and vertically through the phosphor screen (3).

In such a color picture tube, in order to display a correct color image on the phosphor screen (3), the shadow mask (4) must be aligned with the three color phosphor layers of the phosphor screen (8). must be located in On the other hand, the shadow mask (4) is attached and detached multiple times during the process of forming the phosphor screen (3). Therefore, the shadow mask (4) requires a mask support means that is removable and that can always be correctly mounted at the same position when the shadow mask (4) is attached or detached.

Conventionally, as shown in FIG. 6, such mask support means include stud pins (12) fixed to each inner wall of the panel (1), and locking portions (12) that lock onto the stud pins (12). 13), the fixing part (14) fixed to the mask frame (6), its locking part (13) and the fixing part (
14), and a band-like elastic frame holder (6) consisting of a connecting portion (15) that connects the frame holder (6).

In addition, instead of this band-shaped frame holder (16), a frame holder (16) is used to compensate for color shift caused by thermal expansion of the shadow mask (4) due to the collision of the electron beam (9) at the initial stage of operation of the color picture tube. , a stud pin (12) is fixed to each diagonal inner wall of the panel (1), and an elastic frame holder (16) is engaged with the stud pin (12), as shown in FIGS. 7 and 8. a locking part (13) to lock;
It is formed into a wedge shape consisting of a fixing part (14) fixed to the mask frame (6) and a connecting part (15) connecting the locking part (13) and the fixing part (14).
15) on the phosphor screen (3) side (mask body (5)
(side) and fixed to the mask frame (6).

By the way, as described above, the color picture tube is attached and detached multiple times in the process of forming the phosphor screen (3). When attaching and detaching this shadow mask (4), especially for the wedge-shaped frame holder (16), as shown in FIG. bend. Therefore, this wedge-shaped frame holder (
1B), the bending stress is applied to the locking part (13) and the connecting part (
The locking part (13) concentrates on the boundary part (17) with the
The bending occurs to reduce the angle θ between the connecting portion (15) and the connecting portion (15), and before the connecting portion (15) is sufficiently bent as shown by the - dotted line, the tip of the locking portion (13) touches the mask frame (6).
) or the fixed part (14) of the frame holder (te), and the frame holder (1B) cannot be bent any further. Therefore, the boundary part (17) collides with the stud pin (12), and the stud pin (12)
In extreme cases, the collision may make it impossible to attach or detach the shadow mask (4). In particular, this problem arises due to the characteristics of the frame holder (16) and its arrangement, as shown in FIG.
5) In the case of a frame holder (1B) in which the width w1 on the locking part (I3) side is narrower than the width W2 on the fixing part (14) side (wl < w2), the width w1 on the locking part (13) side This is likely to happen because the spring constant is significantly smaller than the spring constant on the fixed part (14) side.

(Issue 8 to be solved by the invention) As described above, as a mask support means for removably supporting a shadow mask inside a panel, there have conventionally been methods using a band-shaped frame holder and a wedge-shaped frame holder. . Each of these frame holders consists of a locking part that locks onto a stud pin, a fixing part that is fixed to the mask frame, and a connecting part that connects the locking part and the fixing part. teeth,
When you bend the locking part to attach or remove the shadow mask, the tip of the locking part comes into contact with the mask frame or the fixed part of the frame holder, and the frame holder cannot be bent any further, causing the boundary The shadow mask may collide with the stud pins and be damaged, or in extreme cases, the collision may make it impossible to attach or detach the shadow mask. In particular, this problem occurs when the width of the connecting part on the locking part side is narrower than the width of the fixed part side due to the characteristics of the frame holder or its arrangement. There is a problem in that the spring constant is significantly smaller than the spring constant on the fixed part side, which makes this problem more likely.

This invention was made to solve the above problem, and even if force is applied to the locking part of the frame holder to attach or detach the shadow mask, the boundary between the locking part and the connecting part The purpose is to create a structure that does not cause large bends.

[Structure of the Invention] (Problem to be Solved by the Invention) A mask support means for supporting a shadow mask consisting of a mask body in which a large number of electron beam passage holes are formed and a mask frame that supports the peripheral portion of the mask body is provided. , a plurality of stud pins fixed to the panel, a locking part that locks to the stud pins, a fixed part fixed to the mask frame, and a connecting part that connects the locking parts and the fixed part. In a color picture tube comprising a frame holder, at least one of the frame holders is reinforced so that the spring constant at the boundary between the locking part and the connecting part is higher than the spring constant on the fixed part side of the boundary. A department was established.

(Function) As mentioned above, if a reinforcing part is provided at the boundary between the locking part and the connecting part to make the spring constant of the boundary higher than the spring constant of the fixed part of the boundary, the shadow mask can be attached and detached. Even if force is applied to the locking part in order to The shadow mask can be easily attached and detached so that the boundary between the locking part and the connecting part does not collide with the stud pin.

(Example) Hereinafter, the present invention will be described based on an example with reference to the drawings.

FIG. 1 shows a color picture tube which is one embodiment of the present invention. This color picture tube consists of a rectangular panel (1) and a funnel-shaped funnel (1) integrally joined to this panel (1).
2), which faces and approaches a phosphor screen (3) consisting of three-color phosphor layers that emit light in blue, green, and red, formed on the inner surface of the panel (1). Mask body (5) with many electron beam passage holes formed inside
A shadow mask (4) consisting of a shadow mask (4) and a mask frame (6) supporting its peripheral portion is attached by the following mask support means. Also, the neck (7) of the funnel (2)
An electron gun (8) is disposed inside. The three electron beams (9) emitted from this electron gun (8) are deflected horizontally and vertically by the magnetic field of a deflection yoke (lO) attached to the outside of the funnel (2). ) is formed in such a structure that a phosphor screen (3) is scanned horizontally and vertically to display a color image. Note that (20) is for shielding external magnetic fields,
This is an inner shield attached to the mask frame (6).

As shown in FIGS. 2 and 3, the mask support means includes a plurality of stud pins (21) fixed to the diagonal inner wall of the panel (1) and the outside of the mask frame (6). It consists of a plurality of elastic frame holders (22) fixed to the side surface and removably engaged with the stud pins (21). Each frame holder (22) is formed by bending a stainless steel material with a plate thickness of about 0.4 m, for example, to form a locking portion (24) with a locking hole (23) for locking the stud pin (21). ), a fixed part (25) fixed to the mask frame (8) and these locking parts (24)
It is integrally molded in a wedge shape and includes a connecting part (26) connecting the fixed part (25) and the connecting part (26), and is attached to the mask frame (6) with the connecting part (26) facing the phosphor screen (3).

Furthermore, in the color picture tube of this example, at least one locking portion (24) of the frame holder (22)
The fixed part (25) of the connecting part (2B) is tightly attached to the inside of the boundary between the connecting part (26) and the connecting part (26) to adjust the spring constant of the boundary part.
A reinforcing member (28) is attached by welding to make the spring constant higher than that of the side. This reinforcing member (28) may be attached by welding to both the locking part (24) and the connecting part (2B), or it may be welded to only one of them.

By the way, as mentioned above, at the boundary between the locking part (24) of the frame holder (22) and the connecting part (2B), the spring constant of the boundary (26) is set to the fixed part (25) of the connecting part (26).
) When the reinforcing member (28) is installed to make the spring constant higher than the spring constant of the side (28), in order to attach and detach the shadow mask (4) to the panel (1), the locking part (28) is attached as shown in Fig. 2.
Even if a force F in the direction of the arrow (18) is applied to the locking portion (2)
4) and the connecting portion (2B) by suppressing the bending that reduces the angle θ at the boundary, the bending stress can be concentrated on the fixed portion (25) side of the connecting portion (2B), and the frame holder ( 22) can be bent mainly on the fixed part (25) side of the connecting part (2B). Therefore, even if the frame holder (22) is bent to attach and detach the shadow mask (4) to and from the panel (1), the locking portion (24) is Mask frame (
6) or the fixing part (25) of the frame holder (22)
The locking part (24) and the connecting part (
2B) can be bent to move away from the stud pin (21), preventing damage to the stud pin due to collision between the stud pin and the boundary between the locking part and the connecting part, which conventionally occurs. It is possible to eliminate the inability to attach and detach the shadow mask.

In the above embodiment, the reinforcing member (28) was attached to the entire widthwise boundary between the locking part and the connecting part, but as shown in FIG. 4(a), this reinforcing member (28) It is sufficient to simply attach the locking portion (24) and the connecting portion (2B) in close contact with the inner surfaces on both sides of the boundary between the locking portion (24) and the connecting portion (2B), as shown in (b). It may be installed to form a bridge on both sides of the boundary between the

Further, the boundary between the locking part and the connecting part can be reinforced by integrally forming the frame holder (22) by bending.

Further, in the above embodiment, the case where the locking part is narrower than the fixing part has been described, but the same effect can be obtained even if both have substantially the same width.

Furthermore, although the above embodiments have described a wedge-shaped frame holder, the present invention can also be applied to a band-shaped frame holder.

[Effects of the Invention] A reinforcing portion is provided at the boundary between the locking portion and the connecting portion of the elastic frame holder that supports the shadow mask to make the spring constant of the boundary higher than the spring constant of the fixed side of the boundary. Even if force is applied to the locking part to attach or remove the shadow mask, bending at the boundary between the locking part and the connecting part is suppressed, and the bending stress is concentrated on the fixed part side of the connecting part. The frame holder can be bent mainly on the fixed part side of the connecting part. Therefore, even if you bend the frame holder to attach and detach the shadow mask to the panel,
The fixed part of the frame holder can be bent sufficiently,
The shadow mask can be easily attached and detached without the boundary between the locking part and the connecting part colliding with the stud pin.

[Brief explanation of drawings]

Figures 1 to 4 are detailed explanatory diagrams of this invention.
The figure shows the configuration of a color picture tube, which is an example of this.
Fig. 2 is a diagram showing the structure of the mask support means, Fig. 3 is a perspective view showing the structure of the wedge-shaped frame holder constituting the mask support means, and Figs. 4 (a) and (b) are different frame holders. Fig. 5 is a diagram showing the structure of a conventional color picture tube, Fig. 6 is a rear view showing the shadow mask support structure using the band-shaped frame holder, and Fig. 7 is a wedge-shaped frame. FIG. 8 is a rear view showing a shadow mask support structure using a holder, FIG. 8 is a sectional view thereof, and FIG. 9 is a perspective view showing the structure of the wedge-shaped frame holder. 1... Panel 3... Phosphor screen 4
... Shadow mask 5 ... Mask body 6 ... Mask frame 8 ... Electron gun 21 ... Stud pin 22 ... Frame holder 23 ... Locking hole
24...Locking part 25...Fixing part 2
6... Connecting portion 28... Reinforcement member

Claims (1)

[Claims] A shadow mask is a mask consisting of a mask body in which a large number of electron beam passage holes are formed facing a phosphor screen formed on the inner surface of the panel, and a mask frame that supports the peripheral part of the mask body. The mask support means is attached to the inside of the panel by a support means, and the mask support means includes a plurality of stud pins fixed to the panel, a locking portion that locks to the stud pins, a fixing portion that is fixed to the mask frame, and the locking portion. In a color picture tube composed of a frame holder consisting of a connecting part that connects a stop part and a fixing part, at least one of the frame holders has a spring constant at the boundary between the catch part and the connecting part. A color picture tube characterized in that a reinforcing part is provided that makes the spring constant of the boundary part higher than that of the fixed part side of the boundary part.