JPS6255849A - Color picture tube - Google Patents

Abstract

PURPOSE:To obtain a color picture tube bearable to shocks from the outside, by composing a holder with a plate form member which has a large opening to make a fixing member with a hole to contact and insert to a stud pin separated from the stud pin which is fixed to a side in the axial direction of the fixing member. CONSTITUTION:A fixing member 35 of a gearing portion 32 has a diameter a little larger than the head of a stud pin 22, and a hole 35a to be contacted and inserted movably to the side wall of the stud pin 22 when it is contacted to the stud pin 22, while a plate form member 34 extended from the connection 33 has a large opening 34a not to be contacted to the stud pin 22. The fixing member 35 and the plate form member 34 are fixed by welds 35, near the ends in the phosphor screen side, and the opposite ends are free. Therefore, even though a force is inflicted in the directions of four arrows (1) to (4), the fixing member will not separate from the stud pin 22, with only some deformation at the weld side to the plate form member 34 in the phosphor screen side.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a color picture tube, and more particularly to a support structure for a shadow mask.

[Technical background of the invention and its problems]

The shadow mask support structure of a general color picture tube will be explained based on FIG. Figure 8 shows a conventional shadow mask structure, which has many slit-like openings (17).
A substantially rectangular shadow mask (18) having a shape is welded to a mask frame (19).
There is a spring member (hereinafter referred to as a holder) (4) approximately in the center of each side of the panel (9), and a hole is drilled at the tip of the spring member (4). ), thereby supporting the mask and frame within the panel.

Recently, a color picture tube in which a holder is fixed to the diagonal portion of the mask frame has also been proposed.

A color picture tube having holders at the four corners of the mask frame generally has a configuration as shown in FIG. 9. That is, the stud pin (22) welded to the panel (11) has a welding point (10) on the mask frame (19).
) is secured to the holder (40). Generally, the distance between the stud pin (22) and the mask frame (19) is approximately 1OIII as shown in the figure! It's as short as l.

This type of holder (40) is compared to one in which the holder is attached to the center of the four sides of the mask frame.

Because the movable part is short, sufficient deformation is not possible, and a very large force is required to lock the holder in the correct position on the stud pin. If a large external impact is applied to such a color picture tube, the holder (
40) is not sufficiently deformed and a strong force is applied to the contact area between the stud pin (22) and the holder (40), a strong abrasion force acts between the stud pin (22) and the holder (40). , if the panel (11) and mask frame (19) move relative to each other, the hole (40a) of the holder (40)
) and the stud pin (22) remain in the same position even if they are not fitted, resulting in color misalignment. The same panel (11) and mask frame (1
The relative positional shift (9) also occurs during the process of forming the phosphor screen of a color picture tube, and a good phosphor screen cannot be formed. This misalignment can occur especially if the shadow mask is repeatedly attached and detached.
(This tends to occur during the process of coating the inner surface of the flannel with Nicarbon and adhering the fluorescent material.)

JP-A-757-187839 describes a holder, stud pin, and other structures for preventing such color shift, but such a method is effective in the process of forming a phosphor screen of a color picture tube. However, it is not very effective against large shocks that occur after the color picture tube is completed.

[Purpose of the invention]

The present invention has been made in view of the above, and an object of the present invention is to provide a color picture tube that can form a good phosphor screen and is resistant to external shocks even after completion of the color picture tube.

[Summary of the invention]

The color picture tube according to the present invention includes an envelope consisting of a substantially rectangular panel, a funnel, and a neck, a phosphor screen formed on the inner surface of the panel, and a phosphor screen disposed inside the neck to excite the phosphor screen to emit light. an electron gun that emits a plurality of electron beams; a substantially rectangular shadow mask that is located between the screen and the electron gun and is arranged in close opposition to the screen and has a large number of through holes; and the shadow mask that surrounds the shadow mask; The mask frame is secured to stud pins installed in the side wall of the panel via a holder. The holder includes a fixing part that is fixed to the side wall of the mask frame, an engaging part that engages with the stud pin, and a connecting part that connects the fixing part and the engaging part. The engaging portion is composed of at least two members, has a single opening, and is a plate-like member that is integrated with the connecting portion. It is particularly effective if the holder and the mask frame are fixed at a corner of the mask frame, and the welding position between the locking member and the plate member is preferably near the end of the phosphor screen.

[Embodiments of the invention]

The present invention will be described below with reference to the drawings. FIGS. 1 to 5 show one embodiment of the present invention.

First, as shown in Figure 2, a color picture tube has a panel (11) made of glass that is substantially rectangular when viewed from the viewing side.
The panel (11) has an envelope (14) consisting of a funnel-shaped funnel (12) sealed around the periphery and a neck (13) connected to the tapered end portion of the funnel (12). . A phosphor screen (15) consisting of a striped pattern of phosphors of each color that emits light in three colors of red, green, and blue is formed on the inner surface of the panel. An electron gun (16) that emits an electron beam is disposed within the neck (13).

Between the screen (15) and the electron gun (16), a large number of slit-like openings (17) are bored near the screen to selectively distribute three electron beams to the screen. A shadow mask (°18) consisting of a thick iron sheet is placed. The periphery of the shadow mask is fixed to a relatively thin iron mask frame (19) with a thickness of 0.4 mm, which is thicker than the plate thickness of the shadow mask. Both the screen (15) and the shadow mask (18) have a rectangular shape, and as shown in FIG. 3, holders ( 21) is fixed by welding.

The holder (21) is made of stainless steel (SUS631) with a thickness of 0.4 mm, as shown in Figures 1, 3, and 4.
It is integrally formed by bending material, and a flat plate-shaped fixing part (30) in the center is welded and fixed to the corner side wall of the mask frame (19). The connecting part (33) bent in the direction opposite to the mask frame (19) is extended from the upper side of the fixed part (3o), and the tip thereof is further bent.
A plate-shaped member (34) constitutes a part of an engaging portion (32) with a stud pin (22) installed in a panel side wall. This plate member (34) has a hole (
A locking member (35) made of stainless steel and having a thickness of 0.4 m is fixed to the stud pin (22) so that the hole (35a) fits into the stud pin (22).

Holder (21) welded to mask frame (19)
extends to a position where it almost contacts the head of the stud pin (22), and the locking member (35) of the engaging portion (32) has a slightly larger diameter than the head of the stud pin (22), When it comes into contact with the stud pin (22), the stud pin (22
) has a hole (35a) movably pressed and fitted into the side wall of the plate member (34) extending from the connecting portion (33).
As shown in FIG. 1, it has a large opening (34a) that does not come into contact with the stud pin (22). The locking member (35) and the plate member (34) are attached to the phosphor screen side.
It is fixed by a welding part (351) near the end of , and the end opposite to 1 is free. The hole of the locking member (35) (
35a) preferably has a flower receptacle shape as shown in FIG. When the panel (11) and the mask frame (19) move relative to each other, the force applied to the holder (21) is transmitted to the locking member (35) through the weld (351),
The ends of the locking member (35) and the plate-shaped member (34) on the electron gun side (not shown) are not fixed, so the plate-shaped member (34)
) can move relatively freely apart from the locking member (35), and the locking member (35) is connected to the stud pin (22).
The engaging portion (32) is not pressed against the stud pin (22) in an immovable state.

Next, a shock is applied to the color picture tube and the mask frame (19
) and the panel (11) move relative to each other will be explained based on FIG. 5. Color picture tube is a panel (11)
If the mask frame (1
9) moves in the direction of panel (11), that is, in the direction of arrow ■. At this time, each part of the holder (21) is indicated by the arrows ■ and ■.
, Force is received in the direction shown by ■.

When this force is large, a force is applied to the engaging portion (32) in a direction toward the mask frame (19), that is, in a direction away from the stud pin (22), as shown by the arrow ■. Therefore, the plate-shaped member (34) moves largely toward the mask frame (19) so as to use the vicinity of the welded portion (351) as a fulcrum, and is subjected to a force that causes it to come off the stud pin (22). However, the locking member (35) is only held by the plate member (34) and the welded part (351), and even if the holder 〇 deforms so that the stud pin ■ comes off, the locking member (35) In other words, the locking member (35) does not come off easily, even if a force is applied in the direction of the arrow (■).

Only the welded portion with the plate member (34) on the phosphor screen side is deformed and does not come off from the stud pin (22). This phenomenon is the same even when the impact force applied to the color picture tube is in a direction different from the above-mentioned direction, and the holder will not come off from the stud pin even with an external impact force that can be considered with common sense. Further, in the embodiment, under normal usage conditions in which the holder (21) is in contact with the stud pin (22), the locking member (35) maintains surface contact with the holder (21), and the support frame (19) However, even if the color picture tube expands during operation, the weld (351)
There is no possibility that a strong force will act only on the material and cause deformation.

FIG. 6 shows another embodiment of the present invention, in which a locking member (
35) and a welded portion (351) of the plate member (34) having a large opening is present near the end opposite to the phosphor screen. In this case, even if an impact force is applied to the color picture tube, the deformation of the mask frame (19) will not occur at the welded part (
351) to the locking member (35), and the locking member (35) is less likely to come off from the stud pin (22).

FIG. 7 shows still another embodiment of the present invention, in which a hole (35
a); a locking member (35) having a locking member (35);
) and a large hole (
36a) and a first plate member (36) having a tCgt
cii Broken Station Meme/This first plate member (36) is welded at the welding part (351) at the end opposite to the phosphor screen, and is large enough not to come in contact with the stud pin (22). opening (34, J), and a mask frame (1
It consists of a second plate-like member (34) integrally connected to the fixing part (30) and connecting part (33) of the holder (21) fixed to the side wall of the holder (21). In this case, even if a large impact force is applied that moves the engaging portion of the holder (21) with the stud pin (22) toward the mask frame (19), the locking member (35) The side will only be deformed, but will not come off from the stud pin (22).

Although the present invention has been described in detail above, it goes without saying that the present invention is not limited to the above embodiments.
Although the explanation has been made in the case of three, for example, three may be used.

Furthermore, although the embodiment has been described with respect to a method of holding the mask frame at the four corners, it is of course applicable to a structure in which the mask frame is held at the center of the sides.

〔Effect of the invention〕

According to the present invention, the mask frame can be freely attached to and removed from the panel surface, and the positional shift of the shadow mask can be eliminated even when the color picture tube is exposed from outside. Obtainable.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing one embodiment of the present invention, and FIG.
3 is a schematic perspective view showing an embodiment of the present invention, FIG. 4 is a front and sectional view showing a part of the holder according to the present invention, and FIG.
The figure is a schematic cross-sectional view explaining the operation of one embodiment according to the present invention, and FIG. 6 is a schematic cross-sectional view showing another embodiment according to the present invention.
FIG. 7 is a schematic sectional view showing still another embodiment of the present invention, and FIGS. 8 and 9 are a front view and a sectional view showing a part of a conventional color picture tube. (17)...Slit-shaped opening (18)...Shadow mask (19)...Mask frame (21)...
・Holder (22)...Stud pin (3o)・
・Fixed part (32)...Engaged part (33)・
...Connection parts (34), (36)...Plate members (
35)...Locking member (351), (352)...
・Welding department agent Patent attorney Norio Ken Chika Yudo Norio Ogo Figure 2 Figure 3 Figure 4 Figure 8 Figure 9

Claims (4)

[Claims] (1) An outer shell consisting of a substantially rectangular panel, a funnel, and a neck, a phosphor screen formed on the inner surface of the panel, and a plurality of electron beams installed inside the neck to excite the screen and cause it to emit light. a substantially rectangular shadow mask disposed between the screen and the electron gun in close opposition to the screen and having a large number of through holes arranged; In the color picture tube, the color picture tube has a mask frame for holding, and the mask frame is locked to a stud pin implanted in a side wall of the panel through a holder, and the holder is fixed to the side wall of the mask frame. It consists of a fixed part, an engaging part that is engaged with the stud pin, and a connecting part that connects the fixed part and the engaging part,
The engagement part is composed of at least two members, one of which is a locking member having a hole into which the stud pin is press-fitted and fitted, and the other member is a locking member having a hole in which the stud pin is pressed and fitted, and the other member is arranged in the tube axis direction of the locking member. is fixed to one end near the end, and the other end is movable,
A color picture tube characterized in that the color picture tube is a plate-like member having a large opening that does not come into contact with the stud pin and is integrated with the connecting portion. (2) The color picture tube according to claim 1, wherein the holder is fixed to a corner of the side wall of the mask frame. (3) The color picture tube according to claim 1, wherein the locking member of the holder and the plate-like member are fixed near the ends of both on the phosphor screen side. (4) The engaging part has a hole that fits into the stud pin 1
2. A color picture tube according to claim 1, comprising two plate-like members having two locking members and a large hole that does not come into contact with the stud pin, one of the plate-like members being connected to the connecting portion.