JPS5873939A - Manufacture of target surface plate for pickup tube - Google Patents

Abstract

PURPOSE:To obtain relatively easily a traget surface plate for a pickup tube to which a metallic pin for a video signal electrode is well airtightly sealed, by applying an active metallic alloy principally consisting of Pb and Sn to the brimmed part of the metallic pin, and pressing them by means of a hot press while maintining the temperature lower than the melting point of the active metallic alloy so as to perform an airtight sealing. CONSTITUTION:In manufacturing a target surface plate which has not any striped color-separation filter, a matter having a melting point of, for example, 226 deg.C is used as an active metallic alloy 15. After a hot press consisting of a hot plate 16 and a pressing jig 21 is heated with heaters to around 200 deg.C, which is slightly lower than the above melting point, pressure is applied with the jig 21 as indicated by the arrow (F). As a result, at a temperature of around 200 deg.C, the alloy 15 becomes in a semi- molten state, in which the solid phase and the liquid phase coexist. Here, when the welding pressure is adjuted to 30-200kg per 1cm<3>, the alloy 15 undergoes a plastic deformation, and part of the alloy 15 is pressed and fitted into a penetrating hole 12. Next, a current is stopped from being fed to the heaters, and the alloy 15 is subjected to a natural cooling while pressure is applied. By the means mentioned above, an airtightly sealed target surface plate can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a manufacturing method in which a metal bottle for a signal line i is passed through a four-sided target plate of an image pickup tube and hermetically sealed.

(2) In a conventional urn image pickup tube, if the Wk signal is taken out directly to the surface of the target face plate, that is, on the atmospheric pressure side, the output capacitance can be reduced, and the 8N ratio can therefore be improved. is well known. Further, in the case of a multi-electronic type single-tube color imaging tube, it is essential to have such a signal electrode structure. Targetera 1 like this
Various proposals have been made regarding structures and manufacturing methods for attaching signal electrodes through the face plate. As an example, a through hole is made in a drawing board, and a metal material such as In, which is easily deformed at room temperature, is inserted into the hole.

Press in the mulch and use it as a signal wire. Method: - Drilling a through hole in the target face plate1. There is a method of forming an adhesive margin in advance around this hole (2) using an active metal that is easy to solder using a plaster soldering iron, and then gluing a part of the metal bottle to this to seal it airtight.

13) Layer point between conventional clamping techniques The technology in B1 above is characterized by the fact that, while the II structure is relatively a container, during actual use of the image pickup tube, the In is pushed by atmospheric pressure and undergoes plastic deformation. A place or association that creates a liaison can be considered. In addition, in the case of M1, there is a problem in airtight sealing, and the measurement is not good. It is difficult to apply the above-mentioned technique to a single color tube having a striped color separation filter and thin glass. This is to prevent the thin plate lath from being damaged by the ultrasonic source.

(4) Object of the Invention The object of the present invention is to overcome the problems of the above-mentioned conventional arrangement and to provide a target face plate which relatively easily seals the metal bottle for the signal electrode of the image pickup tube with good vacuum tightness. An object of the present invention is to provide a manufacturing method.

(5) Structure of the Invention The present invention is characterized in that Pb# and 8 m
An active metal alloy consisting mainly of It is characterized by ,
: Stomach (6) Embodiment 111 of the invention to step 51 through the steps shown in FIG. 4! A completed target face plate shown in I is obtained. Identical parts are designated by the same reference numerals.

First, as shown in tg, a through hole 13 is made in the target face plate riD made of transparent glass. Diameter of hole 13 (d
, ) is preferably as small as possible, but when forming with an ultrasonic processing machine, it is 0.4 to 1.
Preferably within the range of 0. Also, prepare a metal bottle &3, which will be the main part of the individual code. The diameter of the cylindrical part of the metal bottle O (
d8) is about 0.1 to 0.2 smaller than the diameter of the hole (dl), and the length CI> is 0.
．． Make it larger by about 5 to 1.0. This is because it is convenient for connecting the lead wires later. The diameter (41) of the flange I should be as large as possible, but since the area other than the effective screen area of the target face plate is limited and is constrained by the relationship provided here, the dimension (da-da)/2 is If it is thicker than 0.5mm (crotch, knee), you can obtain sufficient reliability of vacuum tightness. 1lll', 1lll Next, use active metal alloy as shown in Fig. Apply a!9.The active metal alloy a contains Pb and s.
n is the main component, CottI: Zm, 8b, AI, Ti
It is an active metal selected from e8i, Cu" and to which a trace amount of kl or multiple metal elements is added. Part 1
An example of this is Cerasolza (product name), which melts 1 1 1
.

Melt it, then dip a part of the metal bottle into it and glue it.

At this time, if ultrasonic vibrations are sent at the same time, mutual contact (stomach
Self ・,,,5 1-ness increases. Next, the live metal surfaces (15m) and (15b) on both sides of the flange part (alpha) are formed flat so as to receive the parts 1114-2. This molding can be carried out by -1'' on a lathe, then thoroughly washed with super wave cleaning in a grain, and the trichlene replaced with degreased edanol. □Dry sac. This creates a dry atmosphere□
In particular, after molding, the thickness of the 6" activated gold iris is thicker on the cylindrical side to be glued (and the opposite side is thicker).
Make it thinner. A suitable range for this thick dragon () is α3 to Q, 41 points, and 0.3 or less for the opposite side.

After the target surface provided with the through hole is also degreased, washed and dried, the metal biscuit brocade is inserted into the through hole a2. Then *<m does not show 1 (hiuretp v-)
Set on l. (Hot press) (A beater fiη is buried in lf9, and a groove is drilled into it for a bi-opening receptacle.A heater ■ and a hot guest senna (to) are buried above bin 0. Place the pressure jig a'l.

In the case of a target face plate that does not have an elongated color filter, an active metal alloy a9 having a melting point of, for example, 226° C. is used. Then, heat the hot press consisting of a hot plate and a pressurizing jig to each heater to about 200°C, which is slightly lower than the above melting point, and press the pressurizing jig as shown by the arrow (F). Pressurize with...
Ru. The active metal alloy becomes a semi-molten state in which a solid phase and a liquid phase coexist at a temperature of about 200°C, and if the pressing force is 3G-100KF per laI, the active metal alloy undergoes a liquid deformation.
A portion is press-fitted into the through hole ri. □Then, the power to the heater is cut off and it is allowed to cool naturally.The load remains applied.

As a result, a hermetically sealed target face plate as shown in No. S② is obtained. This has sufficient adhesion strength to the glass face plate, and provides complete vacuum tightness. In actual operation of the image pickup tube, this sealed portion is sufficiently stable even at temperatures of about 80°C. In the column of the present inventor, it was confirmed that the weight in the above example is preferably about 100 KP/j.

(7) Modified Examples of Implementation of the Invention If the target face plate is for a single-tube color image pickup tube in which a striped color separation filter and thin glass are bonded together, the heat resistance of the color separation filter and organic adhesive used therein may be limited at most. The temperature is below HsO°C. In this case, approximately ~10% of one or both of Ill and Bi is further added to the above-mentioned alloy as an active metal base to lower the melting point to 1 sO.
Bring to ~160°C. Then, the temperature of this base metal during sealing is l
The temperature is kept at sO~150°C, ie, slightly lower than the above melting point, and pressure is applied to seal hermetically. Particularly in this case, since the thin glass is likely to be damaged if pressure is applied from heating 1, it is important to apply pressure after heating to a predetermined temperature.

It should be noted that the semi-planarization of the active metal alloy adhered to the metal bottle described above is not infallible. However, in order to apply the load evenly to the sealed portion, it is better to make it flat.

Also, the active metal alloy can have a uniform melting point depending on the ratio of Pb, an% and additives.

(8) Effects of the Invention According to this invention, since the active metal alloy is placed in advance in the metal bottle for the signal line i and the metal bottle is welded by heat, the workability is good, and the risk of damage to the target face plate is particularly reduced. rare. In addition, since the active metal pot for sealing is bonded over a relatively wide area between the metal bottle and the Turret 794 face plate, it has good vacuum tightness, and there is no risk of forming or breaking even in a relatively high temperature environment afterwards. Therefore, a highly reliable target face plate for an image pickup tube can be obtained.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the state before assembly in this embodiment, Figs.
■It is a cross-sectional view showing a reduced-representation crystal. l...Tagera) mill U-through hole aS...
・Metal bottle 'lI4-Part (c)... Active metal alloy -1. Hot plate (to)... Pressure crushing difference. Figure 2 Figure 3 Figure 5 a

Claims (1)

[Claims] Pb is added to the flange of a signal electric LiM metal bottle having a flange.
, an active metal base containing 8 tungsten as a main component and a small amount of additives is covered, and the metal bottle is inserted into the through hole of the image pickup tube target face plate in which a through hole is formed. A method for manufacturing an image pickup tube target face plate, which comprises pressurizing and airtightly sealing a metal bottle and a target camera face plate at a temperature lower than the melting point of the active container metal.