JPH01117243A - Color image receiving tube - Google Patents

Abstract

PURPOSE:To stabilize the holding status of a shadow mask by forming a spring member for hooking the shadow mask, using two members, connecting both members to each other and applying strain-prevention construction thereto. CONSTITUTION:A frame 19 connected to a shadow mask 18 is hooked to a stud pin 22 at four corners thereof via a spring member 40. The spring member 40 comprises two members of one member 42 fixed to the frame 19 and the other member 41 inserted into the stud pin 22 through a hole 44. The members 41 and 42 are integrated with each other via welding or bending and bend together when subjected to a force in the axial direction of the stud pin 22, thereby ensuring freedom from permanent deformation. Both sides of the member 41 are bent to form a torsion prevention part 421, and the gap thereof from the member 42 is approximately 0.5mm. Permanent deformation, therefore, is extremely small, even if an external shock is applied. According to the aforesaid construction, the shadow mask 18 is retained in a proper condition.

Description

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

(Conventional technology).

A well-known method for supporting a shadow mask in a color picture tube is to use a spring member to suspend the shadow mask from a panel pin installed on a diagonal portion of the inner wall of the panel.

For example, Japanese Patent Publication No. 46-4104 describes a structure in which a shadow mask is fixed to the four corners of a rectangular panel window using spring members. When using a spring member such as that described herein, the shadow mask (18) will expand due to thermal expansion due to temperature rise, as shown in Figure 4.
moves slightly toward the phosphor screen (15), and the holes in the shadow mask and the screen (15) caused by this expansion are
) is corrected for color reproduction errors due to relative displacements between the associated luminescent dots on the dots.

When designing a spring member based on the correction principle as described above, a simple example that can be considered is as shown in FIG. That is, the spring member (10) has a structure in which one side is fixed to a frame (19) supporting the shadow mask (18), and the other side is a bent metal plate fixed to a stud pin (22). However, with this structure, when the spring member (10) is bent as shown in (10a) during the attachment/detachment operation that is repeated several times during the manufacturing process of the color picture tube.

There was a drawback that the bent portion (10 units) was plastically deformed and did not return to its original shape.

To improve this, a frame (
A spring member (20) was considered that was bent from the upper end of a plate-shaped portion welded to the spring member (20) into a substantially dogleg shape toward the lower stud pin (22). With this shape, when bent as shown in (20a) for attachment/detachment, the entire upper part of the welding point (13) is bent, so permanent deformation that would not return to its original state can be avoided. However, it has been found that such a spring member formed by bending a continuous spring material has the drawback of being susceptible to external mechanical shocks.

That is, as shown in Figure 7, the panel stud pin (
Force F□ from the pin acts on the outer periphery of the hole (34) that fits with the frame (not shown), and the surface (
Such a force couple, which tends to cause permanent deformation of the spring member (20) when a force F2 opposite F8 acts on 20,), sometimes occurs when color picture tubes are transported.

When examining the state of permanent deformation, it was found that both ends (201) of the bent portion of the spring member (20) were
It was found that the deformation of and (20□) was significant.

That is, when a couple of forces in the direction shown in FIG. 7 is applied to the spring member (20), deformation as shown by the dotted line in FIG. 8 occurs. The reason for this is that the arc-shaped part shown by the arrow in Fig. 9 is easy to bend, so in the case of Fig. 8, the radius of the arc is smaller at the end (201), and the radius of the arc is smaller at the end (20□).
It turns out that this is because the radius becomes larger.

Furthermore, a spring member as shown in FIG. 10 has been proposed to reduce the amount of deformation at this end. This spring member has ends (33) and (34) of the spring member (3).
Since the two spring members 1) and (32) are pasted together, the strength of the end portion is improved compared to the spring member shown in FIG. 7.

However, when the torsional loads F and F2 shown in FIG. 10 are applied, although the amount of deformation decreases, the deformation shown in FIG. 11 still occurs. In order to achieve this amount of deformation in practice, the plate thickness of the spring members (31) and (32) must be increased, and the spring pressure of the spring members increases significantly, resulting in a process of manufacturing color cathode ray tubes. This greatly deteriorates the workability of attaching and detaching the shadow mask and panel.

As a result, the relatively thin shadow mask may be deformed. However, the design of the spring member had to be a compromise between impact resistance and ease of attachment and detachment.

(Problem to be solved by the invention) As described above, it is still not possible to eliminate permanent deformation in the spring member of the conventional structure, and if the spring pressure of the spring member is increased in order to reduce this, the removability becomes worse. The present invention has been developed in view of the above points, and provides a color picture tube that has little permanent deformation due to attachment/detachment work and small permanent deformation of the spring member due to external impact, and can always obtain good beam landing characteristics. The purpose is to provide.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, the spring member is composed of a fixing part on the mask frame side, and a support part having a hole that fits into a stud bin of the panel and a part that prevents twisting. , these are fixed at the ends, and the fixing part is fixed to the mask frame or the peripheral edge of the mask.

(Function) Since the torsion prevention part is provided on the side of the spring member that is fitted to the stud pin, even if the stud pin latching side of the spring member is twisted due to an external impact, the torsion prevention part provided on the support part itself will prevent it from twisting. It will not twist until it becomes a stopper and undergoes permanent deformation.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings. first,
FIG. 3 shows an embodiment of the present invention, in which a color picture tube includes a panel (11) made of glass that is substantially rectangular when viewed from the viewing side, and a seal around the panel (11). The funnel-shaped funnel (12) and the funnel (12)
) has an envelope (14) consisting of a neck (23) connected to the tapered portion of the tube. 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 (1 (4)) that emits a book electron beam is disposed within the neck (23).

Between the screen (15) and the electron gun (1 (4)), there is a thick hole in which a large number of slit-like holes (17) are drilled close to the screen to selectively distribute three electron beams to the screen. A shadow mask (18) made of a sheet of iron or amber material with a length of about 0.2 ma+ is arranged.

The area around the shadow mask is an iron mask frame part (19 mm) thicker than the plate thickness of the shadow mask with a thickness of 0.4~1.2
) is fixed. Both the screen (15) and the shadow mask (18) have a substantially rectangular shape, and as shown in FIG. Spring member (4
0) is fixed by welding.

The spring member (40) is shown in FIGS. 1 and 2 (a) to (
As shown in Q), stainless steel (S) with a thickness of around 0.41
It consists of two members of υS 631) material. A first stainless steel member (41) forming a support part is fitted with a fixed surface (411) parallel to the outer wall surface of the mask frame (19), a slope (412) continuous with this, and a stud bin (22). It is comprised of a support surface (413) having a support hole (44) and a twist prevention part (414) extending from the support surface (413) in a direction opposite to the stud bin (22).

The second stainless steel member (42) forming the fixing part is located closer to the frame (19) than the first stainless steel member (41), and one end thereof is connected to the fixing surface (4) of the first stainless steel member (41).
11) and are fixed by welding. The second stainless steel member (42) is attached to the frame (19) at several locations.
It is welded and fixed to the outer peripheral wall at the corner.

A detailed view of the spring member is shown in FIG. 2.

As described above, the first stainless steel member (41) has support surfaces (41) on both sides sandwiching the shaft of the stud bottle (22).
3) extending in the opposite direction to the stud bin (22).
The wing has a protruding anti-twisting part (414). The two-winged twist prevention portion (414) extends inside the mask frame (19) through an opening (20) provided in the mask frame (19). In addition, the torsion prevention parts (414) of these two wings and the openings (414) provided in the mask frame (
20) or the outer surface of the folded portion (421) of the second stainless steel member (42).

It is maintained at 0.1 to 0.5 mm.

When such a spring member according to the present invention is bent in the axial direction of the bottle for attachment and detachment, the first stainless steel member (41) of the second stainless steel member (42)
) also bends in the vicinity of the fixed part, so stress is concentrated in a specific area and permanent deformation does not occur.

Furthermore, in response to an external impact as shown in FIG. 13, that is, an impact in the horizontal axis direction of the observation window of the color picture tube, for example, a force F□ is generated in the width direction of the spring member.

When F2 works, the first and second stainless steel members <41
), a compressive force will be generated at the welded fixing part (45) of (42), and a tensile force will be generated at the other end portion (4 (4)).

However, the folded part (421) of the second stainless steel member (42) and the opening (2) provided in the mask frame part
Since the twist preventing portion (414) of the first stainless steel member (41) is provided in the vicinity of 0.1 to 0.5 mm of the inner wall of the spring member 0), the maximum torsional displacement of the spring member is prevented. Therefore, permanent deformation caused by impact is also reduced.

According to experiments conducted by the present inventors on a 21-inch 90' color picture tube, for example, a conventional structure using a spring member having the shape shown in FIG. 7 is A, and a case using a spring member having the shape shown in FIG. 10 is A. B is the case where the spring member according to the present invention having the shape shown in FIG.

When tested by applying impact from falling, the deformation of the beam landing is as shown below.

Conventional product A has 102° Conventional product B has 56 tI! a In invention C, the time was 52 μs.

The spring members used in this experiment were tested by all three
s 6313/4H1 thickness 0.4 m- was used.

Another embodiment according to the present invention is shown in FIGS. 14(a) to 14(d).
As shown in FIG.
19) and a second stainless steel member (42). By configuring like this,
Not only does impact resistance improve, but stainless steel members (4
Workability is also improved because the welding of item 0) to the mask frame (19) can be performed outside the opening (20) provided in the second stainless steel member (42).

Still another embodiment of the present invention is shown in FIGS. 15(a) to 15(d).
), the twist prevention part (414) connects the end of the first stainless steel member (41) opposite to the fixed surface (411) between the second stainless steel member (42) and the mask frame (
The mask frame (19) extends substantially parallel to the bottom surface of the mask frame (19) through a horizontally elongated opening (20) in the mask frame (19). Even with this configuration, the same effects as in the above embodiments were obtained.

Although the above description has been given to a method of supporting at the corners, it is also possible to use a method of supporting at the middle part of the side of the frame to compensate for thermal expansion, and the present invention is applicable even to such a method. It goes without saying that it can be done.

〔Effect of the invention〕

As described above, the present invention includes welding and fixing the first member and the second member to each other at one end, providing the first member with a twist prevention part, and fixing this to the peripheral edge of the frame or the mask. It is possible to obtain a color picture tube that suffers little permanent deformation due to attachment/detachment work or external impact, and always maintains good beam landing characteristics.

[Brief explanation of the drawing]

3 is a partial sectional view of a color picture tube showing an embodiment of the present invention, FIG. 4 is a diagram explaining the principle of correction by thermal expansion, and FIGS. 7 is a perspective view of a conventional spring member, FIG. 8 is a front view showing deformation of the conventional spring member, and FIG. 9 is an enlarged view of the bent portion of the conventional spring member. 10 is a perspective view of another conventional spring member, FIG. 11 is a diagram showing a modification of another conventional spring member, and FIG. 12 is a partial sectional view showing the state when the shadow mask is attached and detached. FIG. 13 is a perspective view of a spring member according to the present invention, and FIGS. 14 and 15 are perspective views of spring members according to other embodiments of the present invention. 10, 20.30.40...Spring member 11...
・Panel, 12...Funnel. DESCRIPTION OF SYMBOLS 15... Phosphor screen, 18... Shadow mask 19... Mask frame, 22... Stud pin 23... Neck 41... First stainless steel member 414... Twisting prevention part 42... ...Second Stainless Steel Agent Patent Attorney Norihiro Ken Yudo Takehana Kikuo No. 1, Fig. 3, Fig. 4, Fig. 5, Fig. 6, 7
Figure 7 Figure 8 Figure 9
Figure 12 Figure 1θ Figure 11 t6 Figure 13

Claims (4)

[Claims] (1) An envelope in which a passively rectangular panel, a funnel-shaped funnel, and a neck are connected, a phosphor screen formed on the inner surface of the panel, and a phosphor screen disposed inside the neck to excite the screen. an electron gun that emits a plurality of electron beams that emit light; 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 apertures arranged; A collar image receiver having a rectangular mask frame portion for holding the shadow mask around the mask frame portion, and locking the mask frame portion to a stud pin implanted on the inner surface of the side wall portion of the panel via a spring member. In the tube, the spring member includes a fixing part fixed to the mask frame part and a support part having a support hole that fits with the stud pin, and the fixing part and the support part are connected by welding or bending. A color picture tube characterized in that the support part has a twist prevention part that prevents twisting of the support part. (2) The color picture tube according to claim 1, wherein the twist prevention portion extends through an opening provided in the mask frame portion to a side opposite to the stud pin. (3) The color picture tube according to claim 1, wherein the twist preventing portion extends through an opening provided in the fixing portion and the mask frame portion to a side opposite to the stud pin. (4) The color picture tube according to claim 1, wherein the spring members are fixed to outer walls at four corners of the mask frame section.