JPS634537A - Electron gun structure - Google Patents

Abstract

PURPOSE:To make it possible to reduce the sliding distance of an inner conductive membrane surface by valve spacers, and to restrict a chipping damage of the inner conductive membrane, when an electron gun structure is inserted to the neck, by providing slit-form cuttings at a shield cup, gearing the valve spacers of a flexible material,with a bend formed at one end and a curve at the other end, to the cuttings,and fixing the bends to the shield cup. CONSTITUTION:Slit-form cuttings 23 are provided at a shield cup 21, while valve spacers 22 are made of a flexible material,and a curve 24 is formed at one end and a bend 25 is formed at the other end. The valve spacers 22 are geared to the slit-form cuttings 23 of the shield cup 21, and fixed by a spot welding to contact the bends 25 to the bottoms of the slit-form cuttings 23. Since the flexible effect can be expected regardless of the gap between the inside surface of the neck 3 and the shield cup 21, a damage of the inner space of the neck 3 when an electron gun structure 8 is inserted to the neck 3 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electron gun assembly, and particularly to its shield cup and valve spacer.

[Conventional technology]

-ffi color picture tube, as shown in FIG. A conductive coating 6 is provided. The internal conductive coating 5 extends to the inner surface of the neck portion 3 and is provided on the funnel portion 2 and electrically connected via an anode button 7 . Further, an electron gun assembly 8 is disposed in the neck part 3, and this electron gun assembly 8 has a high voltage electrode 13, a low voltage electrode 14, and each electrode arranged at a predetermined interval, as shown in FIG. A beat glass 15, a shield cup 11, and a bulb spacer 12 are provided.

The valve spacer 12 is made of an elastic metal material,
A shield cup 11 that presses against the internal conductive coating 5 to position and hold the electron gun assembly 8 and transmits the high voltage supplied to the anode button 7 via the internal conductive coating 5;
It also serves as a guide to the high voltage electrode 13.

However, in such an electron gun assembly 8, when inserted into the neck portion 3, the valve spacer 12 slides on the surface of the internal conductive coating 5, so that the internal conductive coating 5t! −
The fine powder of the internal conductive coating 5 that has been scraped off becomes a source of ray emission caused by discharges and stray electrons within the tube, and has the drawback of significantly lowering the withstand voltage characteristics of the color picture tube.

Therefore, the valve spacer 12 and the shield cup 1
We considered changing the fixing position of valve spacer 1 to reduce the sliding distance e+ of internal conductive coating 5 by valve spacer 12, but
In this case, since the space between the inner surface of the neck portion 3 and the shield cup 11 is narrow, the elastic effect of the valve spacer 12 is lost, and when the electron gun assembly 8 is inserted into the neck portion 3, the inner surface of the neck portion 3 It was found that it caused damage to the

[Problem that the invention seeks to solve]

Conventional shield cup 11 and valve spacer 1
2, when the sliding distance 1!1 of the internal conductive coating 5 by the fixed position changing valve spacer 12 is reduced, the elasticity of the valve spacer 12 is reduced because the gap between the inner surface of the neck portion 3 and the shield cup 11 is narrow. There was a problem in that the effect did not work and when the electron gun assembly 8 was inserted into the neck part 3, the inner surface of the neck part 3 was damaged.

[Means for Solving Problem L] In order to solve these drawbacks, the present invention provides an electron gun assembly having a valve spacer and a shield cup, in which a slit-like notch is provided in the shield cup,
A valve spacer made of an elastic material with curved parts and bent parts on both ends is fitted into the notch of the shield cup,
It is characterized by a structure in which the bent part is fixed to the shield cup. As a result, even if the gap between the inner surface of the neck portion and the shield cup is narrow, the elastic effect of the valve spacer can be sufficiently ensured.

(Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a schematic configuration diagram for explaining one embodiment of an electron gun assembly of the present invention. In the figure, 3 is a neck part, 5 is an internal conductive coating, 13 is a high voltage electrode, 14 is a low voltage electrode,
15 is a bead glass that holds each electrode, 21 is a shield cup, and 22 is a bulb spacer. shield·
As shown in FIG. 2, the cup 21 is provided with a slot-shaped notch 23. The valve spacer 22 is made of an elastic material, and has a curved portion 24 at one end and a bent portion 25 at the other end, as shown in FIG. And valve spacer 2
2 is fitted into the slit-like notch 23 of the shield cup 21, and the bent part 25 is fixed by spot welding so as to come into contact with the bottom of the slit-like notch 23 of the shield cup 21.

With this configuration, the valve spacer 22 can compress the elastic effect regardless of the gap between the inner surface of the neck portion 3 and the shield cup 21, and the electron gun assembly 8 can be inserted into the neck portion 3. The inner surface of the neck portion 3 is not damaged when the valve spacer 22 is removed, and the sliding pressure 4Z2 of the internal conductive coating 5 due to the valve spacer 22 can be made smaller than before.

Further, since the valve spacer 22 is provided with a bent portion 25, this can be used for positioning the valve spacer 22 when spot welding to the shield cup 21.

〔Effect of the invention〕

As described above, according to the present invention, when the electron gun assembly is inserted into the neck part, the sliding distance of the inner conductive coating surface by the valve spacer can be reduced, so that scratching damage to the inner conductive coating can be suppressed. It is possible to obtain a color picture tube with less discharge within the tube and less glare emissions caused by the fine powder in the internal conductive coating.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a perspective view of a shield cup used in the present invention, Fig. 3 is a perspective view of a bulb spacer, and Fig. 4 is a perspective view of a conventional glass bulb. FIG. 5, a partially cutaway side view, is a schematic configuration diagram of a conventional electron gun assembly. 3... Neck part, 5... Internal conductive coating, 13.1
4... Electrode, 15... Bead glass, 11.21
. . . Shield cup, 22 . . . Valve spacer, 23 . . . Notch portion, 24 .

Claims (1)

[Claims] In an electron gun assembly including a valve spacer that comes into contact with an internal conductive coating formed on the inner surface of the neck of the cathode ray tube and a shield cup that fixes the valve spacer, a slit-like notch is formed in the shield cup. established,
An electron gun structure characterized in that a valve spacer made of an elastic material having a curved part at one end and a bent part at the other end is fitted into the slit-like notch, and the bent part is fixed to the shield cup.