JPS61296648A - electron gun - Google Patents

Abstract

PURPOSE:To make it possible to maintain an electron gun to a stem securely and with a high accuracy, by fixing the first grid electrode with supporting parts of the same height by using an insulating support. CONSTITUTION:In an electron gun 1 furnished with a cathode K, and grid electrodes G1 and G2, an insulating support 21 implanting a pair of opposing pins 23a and 23b to fix a retainer 25, and an L shape pin 24 to hold the support 21 itself, with a form to envelope the electrode G1, is arranged at the electrode G1. The pin 24 and a stem pin 7, the extension of the retainer 25 and the pin 7, and, the extension of a heater rest and the pin 7 are fixed respectively to maintain the electrode G1 to a stem 2 mechanically, Consequently, the whole electron gun 1 is also maintained stably to the stem 2 by holding the electrode G1 in such a way. Therefore, the lengths of three supporting points of the electron gun 1 are equal, resulting in equal thermal expansion rates of them in the sealing process, and, the inclination of the gun 1 and the inward deformation of pins can be prevented.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electron gun for an image pickup tube.

[Summary of the invention]

The present invention provides an electron gun for an image pickup tube, in which an insulating support body in which an opposing pin for fixing a retainer and an L-shaped pin for self-support are implanted is arranged to surround a first grid electrode, and the L-shaped pin and the stem pin, By fixing the retainer extension to the stem pin and the heater rest extension to the stem pin, it is possible to ensure support of the neck of the electron gun to the stem and prevent deformation of the stem pin during sealing work. It is.

[Conventional technology]

As image pickup tubes, for example, electromagnetic focusing/electrostatic deflection type and electrostatic focusing/electrostatic deflection type image pickup tubes are known. For the former,
An electron gun equipped with a cathode K, a first grid electrode G1, and a second grid electrode G2 is disposed inside the glass tube facing the target and the mesh-like electrode, and a metal vapor-deposited film of chromium, aluminum, etc. is provided on the inner surface of the tube. There is one in which two pairs of electrostatic deflection electrodes in a zigzag pattern are adhered and formed, and a focusing coil is arranged on the outside of the tube. A predetermined voltage is externally applied to the electrostatic deflection electrode through the stem pin. The latter also includes a cylindrical third grid electrode G3 made of a metal vapor-deposited film on the inner surface of the glass tube in which the electron gun is disposed;
A fourth grid electrode G4 and a fifth grid electrode G5 are deposited, and the electrodes G3, G4, and G5 constitute a focusing electrode system. 1. The electrode G4 is formed of four electrodes in a zigzag pattern. Some devices are configured to double as deflection electrodes. This electrode G3 and G
A predetermined voltage is applied to 4 from the outside through the stem pin.

FIG. 8 shows the main parts of a conventional image pickup tube electron gun.

In the figure, fil is an electron gun (17) equipped with a cathode K, a first grid electrode G1, and a second grid electrode G2.
) shows a glass tube body, and (2) shows a stem with a plurality of stem pins (7) planted therein. The cathode in the first grid electrode G1 is spaced from the first grid electrode G1 via a spacer (11), and has a cathode disk α.
[■-shaped tab (16) fixed to the pin (12) from
The first grid electrode G1 is supported and fixed by a retainer (3). A heater rest (6) is provided on the pin (12) from the cathode disk aω.

(15) is a spacer for regulating the distance from the second grid electrode G2.

The holding of the electron gun (1) against the stem (2) is as follows:
an extension (13) of the retainer (3) and a stem pin (7);
Heater rest (6) extension (14) and stem pin (7)
) and the metal tab attached to the second grid electrode G2 (G2
This is done by fixing the tab (5) and the stem pin (7). On the other hand, predetermined stem pins (7) are provided with electrodes (18) formed on the inner wall of the glass tube (17) by, for example, Cr vapor deposition, such as a third grid electrode G3 and a deflection electrode G4 (electrostatic focusing/electrostatic deflection type). A contactor (19) is provided for applying a voltage from the outside to the two pairs of electrostatic deflection electrodes (in the case of the electromagnetic focusing/electrostatic deflection type).

[Problem that the invention seeks to solve]

As mentioned above, the stem (2) of the electron gun (1) is supported by three places: the retainer (3), the metal tab (5), and the heater rest (6). As a result, when the stem (2) and the glass tube body (17) are sealed together using a gas burner, there is a problem that the electron gun fl) is tilted due to the difference in thermal expansion.

In addition, during this sealing operation, there is a risk that the stem pin (7) may bend inward due to the elastic force of the contactor (19) formed in a spring shape, causing a short circuit with the first grid electrode G1, or
There was also a risk of poor contact with the electrode (18) due to r vapor deposition.

The present invention provides an electron gun for an image pickup tube that can solve the above problems.

[Means for solving problems]

In the present invention, the cathode K, the first grid electrode G1
and an opposing pin (23a) for fixing the retainer (25) to the electron gun of the image pickup tube equipped with the second grid electrode G2.
, (23b) and a self-supporting L-shaped pin (24)
An insulating support (21) having a shape such that it is implanted and surrounding the first grid electrode G1 is connected to the first grid electrode G1.
Place it on 1. Then, the L-shaped pin (24) and the stem pin (
7), 1st Grid Electric I! The extension part (28a) of the retainer (25) fixed in 18Gl and the stem pin (7) and the extension part (14) of the heater rest (6) and the stem pin (
7) to mechanically hold the first grid electrode G1 relative to the stem (2).

By holding the first grid electrode G1, the entire electron gun (1) is also stably held with respect to the stem (2).

The insulating support (21) is preferably formed so as to cover the entire circumference of the first grid electrode G1;
A cutout portion may be formed in the portion of the stem pin (7) where the stem pin (7) is not provided. In addition, this insulating support (2
1) is formed with such a width that its outer surface (30) is inscribed in the upper end (29) of the stem pin (7) provided with the contactor (19).

[Function] According to the present invention, since the lengths of the three support parts of the electron gun (1) are approximately the same, the rate of thermal expansion of each part during sealing using a gas burner is also approximately the same. The electron gun (1) no longer tilts to one side as in the conventional case. Also,
Stem pin (7) provided with contactor (19)
are held in contact with the outer circumferential surface (30) of the insulating support (21), thereby preventing inward deformation during the sealing operation, and therefore, the stem pin (7) and the first grid electrode G1 are There is no risk of short-circuiting or poor contact between the contactor (19) and the electrode (18) due to the metal vapor deposited film on the inner surface of the tube.

〔Example〕

The present invention will be described in detail with reference to FIGS. 1 to 7.

This embodiment is a case where the present invention is applicable to an electron gun of an electrostatic focusing/electrostatic deflection type image pickup tube.

1 to 7, (1) shows the present electron gun as a whole, K shows its cathode, G1- shows the first grid electrode, and G2 shows the second grid electrode. (15) is a spacer for regulating the distance between the first grid electrode G1 and the second grid electrode G2, and both grid electrodes G and G2 are fixed to each other via this spacer (15). (11) is a spacer that regulates the distance between the cathode and the first grid electrode G1, G0 is an insulating cathode disk with four pins (12), and the cathode sleeve (9) is a V-shaped tab ( 16) by paired pins (12)
Fixed. (25) is a retainer.

On the other hand, on the inner surface of the glass tube body (17) in which the electron gun (11 is disposed) are formed third grid electrodes G3, fourth grid electrodes G4, and fifth grid electrodes in a pattern as shown in FIG. 7, formed by, for example, chromium vapor deposition. Electrode G5 is deposited and formed. Electrodes G3, G4, and G5 constitute an electrode system for focusing, and electrode G4 serves as a deflection electrode. Electrode G
4 is formed in a pattern (arrow pattern) in which four electrodes H+, H-, V+, and V- are alternately arranged. (4a)
.

(4b), (4c) and (4d) are the leads, respectively. Also, (2) is the stem, (71 ((7a)
, (7b).

(7c), (7d), (7e), (
7f), -(7g), (7h).

(7i), (7j)) are a plurality of stem pins planted on the stem (2), (19) ((19a),
(19b), (19c).

(19d), (19e)] are contactors that are explosively connected to the required stem pins (7).

In this case, the contactor (19b) is brought into contact with the third grid electrode G3, and the contactors (19a), (19
c).

(19d) and (19e) are respectively the fourth grid electrode G4
The leads of each electrode (4a), (4b), (
4c) and (4d).

In this embodiment, as shown in FIG. 5, a hole (22) made of, for example, ceramics and into which the first grid electrode Q1 can fit is formed, and a hole (22) is formed between the holes (22). There are two opposing pins (23) for fixing the retainer.
a), (23b) and one opposing pin (23a
: An insulating support (21) having one L-shaped pin (24) installed on the side is provided so as to surround the first grid electrode G1.

The width of this insulating support (21) is such that at least the stem pin f7) ((7a
).

(7b), (7c), (7f), (
7h) ) connects its upper end (29) to the insulating support (21)
The length shall be such that it touches the outer circumferential surface (30) of. Stem pin (7) without contactor (19) ((
7d), (7e), (7g), (7
i).

(7j) ), there is no risk of deformation due to this contactor (19), so the insulating support (21
) does not need to be in contact with the outer circumferential surface (30). Therefore,
The planar shape of the outer peripheral surface (30) is similar to that of the stem pin (7) ((
7a).

(7b), (7c), (7f), (
Only the part where the stem pin (7h) ) touches is arc-shaped, and the rest of the stem pin (7) ((7d)).

(7e), (7g), (7i), (
The outer circumferential surface (30) on which 7j)) is located may be cut out in a straight line.

In addition, as shown in Figures 1 and 4, the stem pin (7
) are planted at equal intervals on the stem (2),
In the case of this electron gun (1), the contactor (19) has three stem pins f7) ((7a), (7b),
(7c) ), and two stem pins (7) ((7f) , (7
h)).

Further, as shown in FIG. 6, the retainer (25) has a U-shaped part (26) that fits into the inside of the first grid electrode G1, and a supporting part (27a) of the cathode disk QO.
), (27b) and a pair of extensions (28a), (28b) projecting in the left-right direction.

Among these two extension parts, one extension part (28a) is fixed not only to the pin (12) from the cathode disk 0 but also to the stem pin (7e).
28b”) longer than the electron gun (11
When assembling, as shown in FIGS. 2 and 3, the spacer (11) is used to regulate the distance between the cathode in the first grid electrode G1 and the first grid electrode G1, and the cathode K is connected to the cathode disk. It is supported and fixed by a V-shaped tab (16) fixed to a pin (work 2) from [α], and further held against the first grid electrode G1 by a retainer (3).

A heater rest (6a) connected to one lead end of a heater (32) on the cathode is fixed to a predetermined pin (12) of the cathode disk Ql and extended toward the stem pin (7g). Note that the other lead end of the heater (32) is connected to the stem pin (7d) via the heater rest (6b) and lead wire (33). The cathode sleeve (9) also includes a V-shaped tab (16) and a lead wire (3).
3) to the stem pin (71). The retainer (25) is disposed within the first grid electrode G1, and the insulating support (21) is disposed so that the first grid electrode G1 fits into the hole (22) of the electron gun (11). In contrast, as shown in Figures 1 to 4, L-shaped pins (2
4) and the stem pin (7j), one extension part (28a) of the retainer (25) and the stem pin (7e), and the extension part (14) of the heater rest (6a) and the stem pin (7g), for example, by fixing them by electric welding. First grid electrode G
Provide mechanical support for the stem (2) of 1. This first
By holding the grid electrode G1, the entire electron gun (1), including the second grid electrode G2 placed above, is connected to the stem (2).
) is held stably against

Moreover, one opposing pin (23b) of the insulating support (21)
) is fixed to one extension (28a) of the retainer (25), and the other opposing pin (23a) is fixed to the retainer (25).
25) and the other extension (28b'). As a result, the first grid voltage G1 and the insulating support (21) are stably fixed.

Although the upper part is applicable to an electron gun with an electrostatic focusing/electrostatic deflection type image pickup tube, it is of course applicable to an electron gun with an electromagnetic focusing/electrostatic deflection type image pickup tube.

〔Effect of the invention〕

According to the invention, by using an insulating support,
Since the first grid electrode G1 can be fixed with support portions having substantially equal lengths, it is possible to hold the electron gun with respect to the stem reliably and with high precision. Furthermore, since deformation of the stem pin during sealing work between the glass tube and the stem is prevented, there is no risk of short circuit with the first grid electrode G1 of the contactor or poor contact with the third grid electrode G3.

[Brief explanation of drawings]

FIG. 1 is a plan view of an electron gun according to the present invention, and FIG.
-A' sectional view, Fig. 3 is a BB' sectional view, Fig. 4 is a bottom view, Fig. 5 is a perspective view of the insulating support, Fig. 6 is a perspective view of the retainer, and Fig. 7 is a sectional view of the retainer. FIG. 8, which shows a grid electrode pattern, is a cross-sectional view of a conventional electron gun. (1) is an electron gun, (2) is a stem, (6) is a heater rest, (7) is a stem pin, (14) is an extension of the heater rest, (17) is a glass tube body, (19) is a contactor,
(21) is an insulating support, (23a), (23
b) is the opposing pin, (24) is the L-shaped pin, (25) is the retainer, (28a). (28b) is an extension of the retainer. Same as Hidemori Matsukuma, -・7〉 口4 Half-view of the electric gunNeden J-gun cross-sectional view Main electric gun cQl# Side view Figure 3 Boat ε2. Figure 5: l'l view of the retainer: Figure 26 Grid 7) "Electrical 2 set Φ pattern 21, Figure 7 Figure 3L hanging electric j Gun's J-men-kuni No. 8 hand TgL"? 1. Indication of the incident 1985 Patent Application No. 138419 3, Supplement 1F
Relationship with the considered case Patent applicant address No. 6-7-35, Kitashinyo, Tokyo Parts Store Name (2
18) Sony Corporation Representative Director Norio Ohga 4, Agent 6, Number of inventions increased by amendment + 11 In the specification, page 10, line 20, 1 Pin (12) J from cathode disk (10) (Corrected as pin (23b) J from insulating support (21).

Claims (1)

[Claims] An opposing pin for fixing a retainer and an L-shaped pin for self-support are implanted in an insulating support surrounding the first grid electrode, the L-shaped pin, the stem pin, the retainer extension, the stem pin, and the heater rest extension. and a stem pin, whereby the first grid electrode is mechanically held.