JPS6329476B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a holding device for a picture tube of a television or the like, and particularly to a holding device for a picture tube suitable for cases where storage space for the picture tube is limited.

The recent development of color picture tubes has been remarkable in terms of their performance, and the use of conventional monochrome picture tubes has been limited to special applications and applications where only low cost is required. Also, regarding the size of the picture tube, there is no relationship between a conventional monochrome picture tube and a color picture tube, so try to use as much of the installation space of the traditional black and white picture tube as possible to store the color picture tube. There are many things.

Figure 1 shows the schematic structure of a color picture tube.
A funnel part 3 and a neck part 4 in which an electron gun (not shown) is housed are integrally formed. Further, a metal band 5 for preventing implosion is wound around the outer surface of the panel section 2, and a mounting member 6 called an ear for attaching the picture tube 1 is partially connected to the band 5 and the panel section. 2 and protrudes outside the band 5.

As mentioned above, in order to make the storage space of a monochrome picture tube and a color picture tube compatible, the outer dimension D of the picture tube including the mounting member 6 and the outer diameter dimension d of the color picture tube shown in FIG. may be limited. Under these circumstances, in a conventional color picture tube, a shadow mask 7 is mounted on a support pin provided on the inner surface of the panel section 2, facing a fluorescent screen on the inner surface of the panel section 2, and a leaf spring (both not shown) is attached to the support pin. is suspended through. However, Shadow Mask 7 is
Against vibrations transmitted through the mounting member 6 from the outside,
Normally, resonance occurs at multiple specific frequencies, and in severe cases, it oscillates by several hundred micrometers, causing the electron beam, that is, the shadow of the shadow mask, to move on the fluorescent screen, and this amount far exceeds the margin. This causes undesirable color shift.

This invention was made in view of the above-mentioned circumstances, and provides an improved image receptor that reduces color shift caused by the resonance of the shadow mask of a color picture tube and allows the picture tube to be held in as small a space as possible. The object of the present invention is to provide a tube holding device.

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 2, reference numeral 1 denotes a picture tube, which is the same as that shown in FIG. 1 except that it is bare without a metal band 5 and a mounting member 6. The outer periphery of the picture tube 1 is covered over its entire length with a shield 8 made of permalloy with a thickness of 0.8 mm, and the shield 8 and the picture tube 1 are spaced apart so as not to come into contact with each other. Funnel part 3 and neck part 4
The picture tube 1 is supported by the shield 8 by filling the space between the shield 8 and the shield 8 with an elastic layer 9A made of silicone resin or the like. Further, the elastic layer 9A is surrounded by an elastic layer 9B having a lower hardness than the silicone resin 9A, such as Moltoprene, a product of Bridgestone Corporation.

In FIG. 2, 10 is a deflection yoke, and 11 is a network assembly. Reference numeral 12 designates a mounting member protruding from a position corresponding to the outer periphery of a portion of the funnel portion 3 of the shield 8 near the neck portion 4.

As a result of testing the structure described above, it was found that if the distance between the outer peripheral surface of the picture tube 1 and the shield 8 is about 1 mm, even if an elastic material such as silicone resin is filled in the distance, vibrations from the outside will not occur. Although it is an elastic body and cannot absorb much of it, most of it is transmitted to the picture tube, but 5
It was confirmed that the vibration transmitted to the picture tube 1 was reduced to about 1/10 by interposing the elastic layer 9 with a thickness of about mm.

In actual implementation, first place the bare finished picture tube on a jig, fix the shield 8 at a predetermined position so as to be constant with respect to the picture tube 1, and attach the moltoprene 9B to the neck part of the picture tube 1. Insert it from the 4th side.
After that, deflection yoke 10, network assembly 11
and fix each to the neck part 4. Furthermore, attach Moltoprene 9B to the neck side.
Thereafter, silicone resin is poured into the hole provided in the shield 8 to form the elastic layer 9A.

In another embodiment, an integrated moltoprene 9B with holes drilled from the beginning may be used, and the silicone resin may be poured into the integrated moltoprene 9B.

Alternatively, the moltoprene 9B may be fixed without the neck side, with the neck side facing up, and silicone rubber injected from the neck side.

In this embodiment, the vibration transmitted from the mounting member 6 is transmitted to the shield 8, but most of it is absorbed by the elastic layers 9A and 9B, reducing the vibration transmitted to the picture tube 1 to about 1/10. can be reduced. By interposing the elastic layer 9B, almost no vibrations are transmitted through the elastic layer 9B, so vibration absorption is greater than when using only the elastic layer 9A.

The above description has been made regarding the vibration of the shadow mask of a color picture tube, but the holding device of the present invention is also effective for black and white (monochromatic) picture tubes. This is because not only the shadow mask but also the adverse effects of external vibrations can be applied to, for example, the anti-vibration characteristics of the electron gun, and the holding device of the present invention can also reduce the vibrations of the electron gun.

As explained above, the picture tube holding device according to the present invention prevents harmful effects on the picture tube, such as resonance of the shadow mask due to external vibrations, from occurring between the picture tube outer circumferential surface and the shield or the picture tube holding member. By providing the elastic body, it is possible to significantly reduce and prevent vibrations transmitted from the outside to the picture tube. Therefore, according to the present invention, it is possible to provide a holding device capable of reducing color shift of a color picture tube and preventing deterioration of other characteristics due to vibration of the picture tube.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway schematic side view showing an example of a conventional picture tube, and FIG. 2 is a partially cutaway side view showing an embodiment of the present invention. 1 is a picture tube, 2 is a panel portion, 3 is a funnel portion, 4 is a neck portion, 6 is a mounting member, 8 is a shield, 9A is a first elastic layer, and 9B is a second elastic layer. Note that the same parts in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A picture tube and a shield or picture tube holding member provided on the outer peripheral side of the picture tube are separated, and the picture tube is connected to the shield or picture tube holding member via a first elastic body. A holding device for a picture tube, characterized in that the first elastic body is supported by a second elastic body having a different hardness from the first elastic body. 2 Claim 1, characterized in that the hardness of the second elastic body is lower than the hardness of the first elastic body.
The picture tube holding device described in Section 1. 3. The picture tube holding device according to claim 1 or 2, wherein the second elastic body is provided on both sides of the first elastic body. 4. The picture tube holding device according to claim 1 or 2, characterized in that the second elastic body is provided on one side of the first elastic body.