JPH0665002B2 - Electron gun for cathode ray tube - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to an electron gun resistor incorporated in a cathode ray tube,
In particular, it relates to the structure of the electrode extraction portion.

[Technical background and problems of the invention]

Generally, about 25 KV for a cathode ray tube such as a color picture tube.
In addition to the anode high voltage of ~ 30KV, for example, a medium voltage of about 5KV to 8KV is required as the focus voltage of the electron gun, and in the case of a mask focusing color picture tube, a high voltage slightly lower than the anode high voltage is required. is necessary. Supplying such a medium-high voltage other than the anode high voltage separately from the outside of the tube causes a large problem mainly in the withstand voltage of the supply part, and therefore the structure of the supply part becomes complicated, which is disadvantageous. Therefore, a method of arranging a resistor in the cathode ray tube and dividing the high voltage of the anode by this to obtain the required medium and high voltages, for example, Japanese Utility Model Laid-Open No. 48-21561, Utility Model No. 55-38484, and U.S. Pat. It is proposed in US Pat. No. 3,932,786, US Pat. No. 4,143,298 and the like.

However, in this case, the method of supporting the resistor and the contact between the electrode and the resistor are difficult, and conventionally, they were fixed with a wire or fixed with an elastic body, but neither contact failure nor mechanical strength was sufficient. Had poor reliability such as deterioration in withstand voltage.

[Object of the Invention]

An object of the present invention is to solve the above-mentioned problems and to provide an electron gun provided with a highly reliable resistor which makes it easy and reliable to contact and support and fix the resistor.

[Outline of Invention]

The present invention relates to a cathode ray tube electron gun including a resistor for supplying an electrode potential of an electron gun having a plurality of electrodes built in a cathode ray tube through a metal wire, wherein the resistor is provided on a ceramic substrate and a ceramic substrate. The high resistance pattern portion having a relatively high resistance value formed and an electrode lead-out portion provided at a part of the high resistance pattern portion and having a relatively lower resistance value than the high resistance pattern portion, The pattern portion is covered with insulating glass, the electrode extraction portion has at least one opening and a metal element attached to the opening, and the resistor is formed by the metal wire fixed to the metal element. An electron gun for a cathode ray tube, which is firmly fixed to the electrode and electrically connected.

Example of Invention

 Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view of a resistor for explaining the present invention. In Fig. 1, the resistor (1) has an opening (2
Rectangular thin insulating substrate (a), (2b), (2c)
And electrode lead-out portions (4a), (4b), (4c) made of a low-resistance material or a metallic thin film provided around the opening, and a resistance material applied in a predetermined pattern between the electrode lead-out portions. (5),
An insulating thin film (6) covering the resistance material (5), and metal elements (7a), (7b), attached to the openings (2a), (2b), (2c),
It consists of (7c). In a preferred embodiment of the present invention, a ceramic substrate (3) having a width of 5.0 mm, a thickness of 1.0 mm, and a length of 60.0 mm provided with an opening having a diameter of 2 mm is mixed with glass containing ruthenium oxide as a main component and a glass having a height of about 5000 MΩ. The electrode lead-out parts (4a), (4b), (4c) consisting of a resistance material (5) with a resistance value and a low resistance material of about several KΩ mainly consisting of ruthenium oxide are applied in a predetermined pattern to about 800 ° -10
Sintering is performed at 00 ° C., then the high resistance material portion is coated with a glass material (6) having a thickness of about 100 μm and sintering is performed at about 500 ° C. As shown in FIG. 2, a cylindrical metal having a height of 4.0 mm and an outer diameter of 2.0 mm, which is made of stainless steel having a thickness of 0.2 mm in the opening having a diameter of 2 mm and has a flat portion (8) having a diameter of 4 mm. The element (7) is inserted, and as shown in FIG. 3, the cylindrical portion (9) protruding on the back side of the ceramic substrate is crushed and fixed. At this time, the low resistance material is applied to the inner wall (10) of the opening, and the metal element (7) is in strong contact with the low resistance material in the cylindrical portion (11) together with the flat portion (8). 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a sectional view taken along line AA of FIG.

An example of using such a resistor in an electron gun for a color picture tube is shown in FIG.

In FIG. 4, the electron gun (20) has a plurality of electrodes (to be described later) and a plurality of insulating supports (21) for supporting the electrodes, and is enclosed in a glass cylindrical neck (22). The plurality of electrodes generate three electron beams (23R), (23G), and (23B) for projecting red, green, and blue phosphors, respectively, and three heaters (24R), ( One row of cathodes (25R), (25G), and (25B), which are equipped with 24G) and (24B), and predetermined electron beam passage holes are formed at positions corresponding to these three cathodes to form an integrated structure. First grid having (unitized structure)
G ₁ (26), second grid G ₂ (27), third grid G ₃ (28), fourth grid G ₄ (29), and convergence electrode (30), each of which in the order named It is planted and fixedly supported by (21). A voltage is applied to an anode terminal (not shown) of the convergence electrode (30) and an internal conductive film (31) is passed through the convergence electrode (30).
A valve spacer (32) is added to apply a high voltage Eb of 25KV. The resistor (1) is fixed to the back of the insulating support (21) with wires (32), (33) and (34). Resistor
The central portion of the first wire (32) is welded to the metal element (7a) of the first electrode extraction portion (4a) of (1), and both ends thereof are welded and fixed to the convergence electrode (30), central portion of the second wire (33) is welded to the metal element of the electrode lead-out portion (4b) (7b), both ends thereof are welded to the third grids G ₃ (28), the third electrode lead-out portion ( One end of the third wire (34) is welded to the metal element (7c) of 4c), and the other end is welded and fixed to the stem pin (35) provided at the bottom of the neck (22). The stem pin (35) is grounded externally through a variable resistor (36). FIG. 5 shows a sectional view taken along the line BB including the electrode lead-out portion in FIG. The X mark in the figure indicates welding. As can be seen from FIG. 5, the resistor (1) is fixed to the electrodes behind the insulating support (21) by wires and is in perfect electrical contact. With this configuration, the electrical voltage is as shown in Fig. 6, and a high voltage of approximately 25 KV applied to the third grid G ₃
The electron beam is applied as a divided voltage by the resistor (1) of Eb, whereby the electron beam is focused on a predetermined screen.

In the above embodiment, the metal element of the electrode lead-out portion of the resistor was a cylindrical element having a flat portion on one side and was inserted and fixed by crushing the other end, but the present invention is not limited to this. First, as shown in Fig. 7 (a), insert a cylindrical object (40) with notches (41), (42) into the side wall made of elastic material and attach and fix it by its elastic force. May be, also in Figure 7
It is also possible to insert a wire (43) in which the central portion of the wire is concave (44) as shown in (b) and fix it by its elastic force. Fig. 7
In the case of (b), both ends of the wire can be welded and fixed to the electrode as they are, which is convenient.

Further, in the above-mentioned embodiment, the case where the electrode potential of the electron gun for a color picture tube is supplied as the division potential by the resistor is shown, but the present invention is not limited to this, and US Pat.
It may be used as a resistor for preventing a spark current as shown in the specification, or may not be an electron gun for a color picture tube. Alternatively, it may be used when supplying the mask potential of the mask focusing color picture tube.

〔The invention's effect〕

As described above, according to the present invention, it is possible to firmly perform the electrical connection and the fixation of the resistor through the metal element,
It is possible to provide an extremely reliable cathode ray tube.

[Brief description of drawings]

1 is a perspective view of a resistor according to an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a sectional view taken along the line AA of FIG.
FIG. 4 is a schematic diagram in which the resistor of FIG. 1 is used in an electron gun for a color picture tube, FIG. 5 is a sectional view taken along line BB of FIG. 4, and FIG. 6 is an electrical configuration of the electron gun of FIG. FIGS. 7 (a) and 7 (b) show another embodiment of the present invention. 1 ... Resistors with built-in cathode ray tube 2a, 2b, 2c ... Opening holes 4a, 4b, 4c ... Electrode extraction part 7a, 7b, 7c ... Metal element

Claims (1)

[Claims] 1. An electron gun for a cathode ray tube comprising a resistor for supplying the electrode potential of an electron gun having a plurality of electrodes built in the cathode ray tube through a metal wire, wherein the resistor is a ceramic substrate and a ceramic substrate. A relatively high resistance high-resistance pattern portion formed on the upper resistance pattern portion and a portion of the high-resistance pattern portion is provided with a relatively low resistance value electrode extraction portion from the high resistance pattern portion, The high-resistance pattern portion is covered with insulating glass, and the electrode lead-out portion has at least 1
Each of the resistors has a hole and a metal element attached to the hole, and the resistor is firmly fixed to and supported by the electrode by the metal wire fixed to the metal element and electrically connected to the electrode. An electron gun for a cathode ray tube, which is characterized in that