JPS609032A - Method for testing continuity of heaters for electron gun - Google Patents

Abstract

PURPOSE:To enable the continuity test of a heater to be performed at the same time as the heater is fixed in place by welding, by providing conductive terminals to contact the outer leads of each heater and a continuity indicating device on the stem retaining portion of an electron gun assembling jig. CONSTITUTION:A pair of conductive terminals 51, 51 made of a metallic plate provided with a spring force is disposed on the surface of an insulative stem outer leads retaining portion 34, and the terminals 51, 51 are adapted to cover holes 35a, 35a through which a pair of heater outer leads 12a, 12a are to be passed, and the terminals are connected with one end of a power source 52 and one end of a continuity indicating device 53 which is connected in series with the power source 52. When the stem outer leads are inserted into the through holes 35 from below, the ends of the pair of heater outer leads 12a, 12a abut against the bottom face of respective conductive terminals 51, 51, and then, upon welding of a pair of inner leads 13a, 13a for the heater to heater tabs 41, 41, the continuity of the heater outer leads 12a can be tested by operation of the continuity indicating device 53.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heater conduction method for an electron gun used in a cathode ray tube.

FIG. 1 shows an example of an infin type electron gun used in a color cathode ray tube. This electron gun can be roughly divided into stem (υ
and an electrode structure (2), and the configuration of each part is as follows.

In Figure 1, () is the stem exhaust pipe, which is electrically connected to exhaust the inside of the cathode tube to the high-temperature exhaust pipe.
) is an external terminal that applies voltage to each electrode. (2) is called the stem inner lead, and the above stem outer lead 0
It is integrated with the electrode structure (2) via a dumet wire (not shown), and is used to establish an electrical connection relationship to each electrode of the electrode structure (2) and to firmly hold and fix the electrode structure (2). be. On the other hand, the electrode structure (2) includes a heat shield V and a cathode support (2).

G1), G2-. G3), G4), G5), G
(Electrodes such as 5 (7) are fixed to the bead glass 4 at predetermined intervals, and each t-pole is fixedly connected to the stem inner lead 0 described above by spot welding or the like.

The stem (1) and the electrode assembly (2J) are welded and fixed using an electron gun assembly jig (3) tray as shown in Figure 2. In this figure, C is the electrode assembly fixing part. C,
The 06 (to) electrode shown in FIG. 1 is inserted into this and fixed. G3 is a stem fixing part, which consists of a stem outer lead support part (■) and a stem exhaust pipe support part (■). Stem outer lead support part (the middle is not made of insulating material,
The outer lead insertion hole (to) through which a part of each outer lead @ shown in Fig. 1 is penetrated and supported, and the stem exhaust pipe (
) is provided in the cutout part to avoid the hit of L]). The electrode structure fixing part C36 and the stem fixing part 2 are arranged coaxially.

After attaching the stem (1) and electrode structure (2) to such an electron gun assembly jig (3), each stem inner lead screw is attached to a predetermined location of the electrode structure (2) by spot welding or the like. Connect to the stain - by adding the stem (
υ and the one-shield paulownia body (2) can be assembled coaxially.

On the other hand, the Wja diagram shows an example of the connection of the heater Q◇ of an infin type electron gun. In this figure, the core wires (21a) of three heaters Cυ are welded and fixed to their respective heater tabs 0υ, and then the heater tabs (B) are welded and fixed to the heater connector. Also shown in this figure is a pair of heater tabs (41).

- a pair of heater inner leads (13a).

(13a) is further fixed by welding.

In the example shown in FIG. 3, there are 14 welding locations related to the heater. Further, the core wire material of the heater 3υ is made of a high melting point metal material such as tungsten, and the core wire diameter is 0.03 to α1M, which is very delicate. Therefore, depending on subtle changes in welding conditions, operator proficiency, etc., the heater? It is easy for the υ weld to melt or come off.

Therefore, the stem inner lead (2) and electrode structure (2)
After welding, we conduct a 100% continuity test of the heater Qp using a tester, resistance meter, etc., but with this method, it is necessary to secure an inspector for the continuity test, and the electron gun Manufacturing cost? In order to lower the cost, it is desired to save labor in this inspection process.

This invention was made in view of the above-mentioned circumstances, and it is possible to inspect the conductivity of the heater at the same time as welding and fixing the stem and the electrode structure, thereby contributing to labor saving and cost reduction of an electron gun heater. It aims to provide a complete jaundice inspection method.

Hereinafter, one embodiment of this 4D light will be described based on the drawings.

FIG. 4 is a perspective view of the stem outer lead support portion (2) of the electron gun assembly jig used for carrying out the present invention. In this figure, the electrically insulating stem outer lead support part G (
◆Multiple stem outer lead insertion holes on the top surface)
Among them, one pair of heater outer leads (12a)
, (12a) pass through the hole (35a), (35a)
1 made of a metal plate with spring properties so as to cover the
A pair of conduction terminals ψυ and ψυ are arranged, and one end (51a) and (51a) of the pair are fixed to the stem outer lead support part (2). ←One source is used, for example, ultra-small dry batteries.

For example, a light emitting diode is used as a conduction indicator. - is a lead wire, which electrically connects one end of the six power supplies connected to each other in series and one end of the continuity indicator - to the electrically separated continuity terminal Gυ.

Note that the other configurations are completely the same as those of the conventional example, so the explanation thereof will be omitted.

In the above configuration, as described in FIG. 2, the stem (υ is to the stem fixing part) and the electrode (14 bodies (2) are fixed to the electrode structure fixing part c3) shown in FIG. At this time, each stem outer lead shown in FIG. 1 is inserted into each of the outer lead insertion holes (1) from below. At this time, in the configuration shown in Fig. 4, there are 7 inner and outer heaters for each stem rear heater and one pair of heaters. The ends of J-F (12a) and (12'b) are still in contact with the lower surface of the respective conductive terminals i) and υ,
Due to the spring force of the continuity terminal ψυ, q), it is electrically connected reliably to this. From this, the electrode structure (2) and each stem inner lead 04 are connected by welding, but in this step, as shown in Figure 3, a pair of heater inner leads (13a) and (13a) and a heater tab are connected. (B)
, 0]), the continuity terminal Φυ, $ in Fig. 4 is welded.
A short circuit occurs between υ. At this time, it is possible to determine whether or not the heater outer lead (12a) is electrically conductive based on whether or not the electrical continuity indicator is operated.

In other words, if the heater circuit is normal, the continuity indicator Q will light up, but if there is a poor connection in the heater circuit, the continuity indicator Q will not light up, and from this it is possible to know that there is a poor connection in the heater circuit. can.

In the above embodiment, a light emitting diode was used as the continuity indicator, but the actual continuity indicator is an incandescent lamp, an electronic buzzer, a meter, etc.
In addition, the power source Q5 is not limited to batteries, but may be any other AC power source, and furthermore, a tester or resistance meter with an integrated indicator and power source may also be used.

As can be seen from the above description, according to the present invention, the continuity test of the heater can be performed at the same time as the stem inner lead and the electrode structure are assembled in the process of welding the stem inner lead and the electrode assembly, and therefore, compared to the conventional method, This has the effect of promoting labor saving and contributing to cost reduction of electron guns.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the electronic ζXiao, Figure 2 is a perspective view of the electron gun assembly jig, Figure 3 is a front view showing an example of heater connection, Figure 4
The figure is a partial perspective view of an electron gun assembly jig according to an embodiment of the present invention. (1) Stem, (2) Electrode structure, (3)
...Electron gun assembly jig, ■...Stem outer lead,
113... Aukuri lead for heater, tj:I・
...Stem inner lead, center...electrode structure fixing part,
(To)... Stem fixing part, 6υ... Continuity terminal, Q.
・Continuity indicating device. Note that the same reference numerals in the drawings indicate the same or equivalent parts. Agent Masuo Oiwa Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] (1) In an electron gun assembly jig that welds and fixes a stem fixing part and an electrode structure fixing part, and a stem inner lead and an electrode structure, it is installed in the stem fixing part, and the plurality of stem outer leads of the stem are fixed. The stem inner lead and the electrode structure are fixed by welding, and the stem inner lead and the electrode structure are fixed by welding. At the same time, the method for testing continuity of a heater in an electron gun is characterized in that the determination is made based on the continuity sound of the heater outer lead and the operating state of the continuity indicator.