JPS5832327A - Button stem electron tube - Google Patents

Abstract

PURPOSE:To make damage of a glass-sealed part unlikely to occure and heighten reliability of the sealed part by a method wherein a button stem is used, whereby a lead-in wire is bent in the middle part of sealed wire with both ends in a parallel state and a diameter of a circle connecting the centers of internal lead-in wires is made smaller than that of the circle connecting the centers of external pins. CONSTITUTION:A lead-in wire is bent at a sealing axis 2a with an internal lead 1a and an external pin 39 arranged in parallel while holding the condition ID'< OD. As a result, the distance from a stem wart 4a to a flare 5a, namely l'1 and l'2 become larger than before and when sealing the stem flare 5a and a bulb end, a product in a good sealed form and with high reliability can easily be obtained. Then, a diameter of a circle connecting the centers of external pins (pin circle diameter) is considered to be OD, while the diameter of the circle connecting the centers of the internal lead-in wire is considered to be ID'.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a button stem electron tube that facilitates continuous firing operations and has improved reliability of the glass sealing portion between the button stem and the end of the tube.

Conventional button stem electron tubes, such as Plaquen tubes, use an introductory tube in which an internal lead, a sealed wire, and an external pin are connected in a straight line. Section 111(a)
is a plan view of a button stem of a conventional tube, (b) is a cross-sectional view taken along A-A shown in (a), l is an internal IJ-do, 2 is a sealing line, 3 is an external pin, and 4 is an internal lead. 5 is the button stem disc part - the flare that forms the edge, l
is the exhaust pipe. The sealing wire 2 is usually made of a well-known dememet mat which is compatible with the glass and whose sealing portion with the glass can maintain the vacuum during temperature changes. The internal lead 1 is connected to the tube electrode, and the external pin 3 forms a base together with the stem plate and is inserted into a hole in a socket (not shown) to serve for connecting the tube electrode to the external BjINK. The exhaust pipe 8 is used for long periods of time by thoroughly exhausting and removing gases in the pipe, such as adsorbed gases on each electrode surface and the inner wall of the pulp, during an exhaust operation time suitable for mass production. In order to maintain a predetermined degree of vacuum, it is desirable to increase the inner diameter of the tube, increase the conductance, and increase the pumping speed sufficiently. 41, such as a color cathode ray tube, has a large internal area, and on top of it is formed a fluorescent surface, an internal conductive film, etc. that easily attracts and adsorbs gases, and a large area electrode such as a shadow mask is formed. For those with this, it is necessary to make the exhaust pipe internal diameter as thick as possible. On the other hand, in the case of color cathode ray tubes, the diameter of the bulb neck tube should be made as thin as possible in order to reduce uneven power consumption, etc. In the end, the diameter of the flare 5 of the button stem cannot be made larger due to the relationship with the diameter of the neck tube, which is desired to be made thinner, so the external The diameter OD (first figure) of the so-called bottle circle, which is a circle connecting the centers of the bottles 3, is considerably larger than the diameter of the flare 5.

In the case of a conventional tube, the inner lead 1 of the button stem introduction wire, the sealing wire 2. Since the external bin 3 is in a straight line, the internal lead l
The diameter ID of the circles connecting the centers of is equal to the above OD, so the distance J,, J, from the stem wart 4 to the flare S is considerably small. Therefore, during the glass melting work when the bulb end and the tongue stem are sealed, Section 311(1), (b)K
A sealed shape as shown is likely to occur even with slight variations in heating conditions.

(a) The one with K is slightly underheated, (b) The one with K is one with slightly overheated, and the one shown in (1) tends to break from the welded part 7 where there is insufficient welding, and the one shown in (b) In kimonos, stress is concentrated at the acute-angled bottom end of the groove formed at the inner edge of the welded part 7 between the stem thorn surface and the inner surface of the neck tube, and cracks tend to occur from there. Note that 6 in the figure is the end of the valve.

An object of the present invention is to provide a button stem electron tube with a highly reliable sealing part that is less prone to breakage of the glass sealing part as described above.

In order to achieve the above purpose, in this invention @, the lead-in wire is bent at the middle sealing part while keeping the internal leads at both ends and the external bottle in a parallel state, and the lead-in wire is bent to form a circle connecting the centers of the external bottles. A button stem is used in which the diameter ID of the circle connecting the centers of the internal leads is smaller than the diameter (bin circle diameter) OD. This is because OD generally cannot be reduced due to standards and the requirement to maintain the pin-to-pin withstand voltage value at a predetermined value or higher on the outer surface of button stems, sockets, etc. where the surface is dirty and the withstand voltage tends to drop, but ID If so, the stem manufacturing work may be extremely difficult or the installation process may be difficult.
This is because the right circle does not cause any serious deterioration of the transmission characteristics of the peripheral signal due to the rotation, and can be changed arbitrarily by the manufacturer.

2nd figure) is a plan view of the stem of the embodiment of the present invention, -) is (
It is a B-Blil sectional view shown in a). The introduction wires related to this @ are the internal lead 1, the sealed wire 2, and the external bottle 31.
At the sealing part 2, the inner lead 1m and the outer bottle 3m are bent as shown in the figure, while remaining parallel to each other.
D (OD).This distance J,, J, is larger than J,, J, in the conventional case, and the stem flare is 5 m, and the valve end 6 is relatively large. With working tolerance (i.e. easy K) 1., all (C),
As shown in , Ichisho is highly reliable and has a perfect sealing shape.
That's a good thing. Since this step is sufficiently heated, it will not crack at the welded part 7, and (2) Since no shaped grooves are formed, no cracks will occur due to stress concentration.

As explained above, according to ILC Hon Takaaki, it is possible to perform the melt-sealing work with a button stem equipped with an exhaust pipe that has a relatively large internal diameter relative to the valve value with relative ease. , so that welded parts and reliable products can be obtained at high -1-11.

[Brief explanation of the drawing]

Figure 1 (Fig. 1) is a plan view of the stem of a conventional pipe, (b) is (a)
Figure 2 (M) is a diagram showing the embodiment of the present invention, Figure 3 (11) is a diagram of the sealing shape that is easily broken due to insufficient heating of the conventional pipe layer, (b) (C) is a diagram of a sealing shape of a conventional pipe in which stress is likely to concentrate due to overheating of the welded part, and (C) is a diagram of a good sealing shape of an embodiment of the present invention. 1m...Internal lead, 2m...Sealing-13a...
External bottle, 4... Stem [, Sa... Stem flare, 6... Valve end, 7... Welding area, 8...
Exhaust pipe.

Claims (1)

[Claims] In a button stem electron tube, a lead-in wire consisting of an internal lead, a sealed wire, and an external pin is connected at both ends to an intermediate sealed wire portion.
This button stem electron tube is characterized by using a button stem that is bent in a parallel state and made smaller immediately after the circle connecting the centers of the internal leads than immediately after the circle connecting the centers of the external pins.