JPS5853463B2 - Image tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image pickup tube that can extract a plurality of stable signal currents from a single image pickup tube.

It is required in various cases to extract a plurality of signal currents from one image pickup tube.

This is especially necessary when obtaining a color television signal from a single image tube.

An example of an image pickup tube using a photoconductive surface from which a plurality of signal currents are taken out will be explained with reference to FIGS. 1 and 2.

A transparent electrode 2 is formed on an optically polished transparent face plate 1 by a vapor deposition method or the like.

The transparent electrode 2 includes, for example, two transparent electrodes connected to a signal ring 4 through an indium ring 3 and a signal pin 5.
The transparent electrode 2B is connected to the transparent electrode 2B.

A photoconductive film 6 made of antimony trisulfide or the like is formed on the transparent electrode 2 .

(FIG. 2) and FIG. 4, illustration of the photoconductive film 6 is omitted for clarity of explanation.

) A transparent electrode 2' is placed in a glass tube 8 enclosing an electron gun 7.
A transparent face plate 1 on which a photoconductive film 6 and a photoconductive film 6 are formed are joined to form an image pickup tube.

As is clear from FIGS. 1 and 2, one signal current from two transparent electrodes is completely connected through the indium ring 3 and taken out from the signal ring 4.
Even if the image pickup tube receives mechanical shock inside a television camera, a stable signal current can always be extracted from the two transparent electrodes.

The signal current taken out from the signal pin 5 is transferred to the transparent electrode 2.
Since the contact between B and the signal pin 5 is maintained only by the spring properties of the latter, the electrical connection is extremely unstable.

Therefore, when a television camera receives a mechanical shock, noise is generated from its image pickup tube, making it impossible to extract a good television signal.

Of course, it seems that this problem can be solved by using a material with excellent spring properties for the signal pin 5, but
There is no good material that can be sealed in the glass tube 8 of the image pickup tube to maintain a vacuum and has excellent spring properties.

In order to eliminate these drawbacks, the present invention has been developed by attaching a conductive material such as indium, which has good contact with the transparent electrode 2B, to the tip of the signal pin 5 that connects with the transparent electrode 2B. This completes the connection of signal pins.

Next, the present invention will be explained using FIG. 3 and subsequent figures.

A transparent electrode 2 mainly made of, for example, tin oxide is formed on an optically polished transparent face plate 1 by a vapor deposition method or the like, and then the transparent electrode is divided into 2A, 2Bt or more by a photoetching technique, for example.

For example, two of the two transparent electrodes are formed so as to be in contact with the indium ring 3 as shown in FIG. Indium 9, which is a transparent metal, is attached to the tip of the signal pin 5, and connected by pressing it against the transparent electrode 2B.

Indium is an extremely soft metal and is easily deformed.

Therefore, the tip of the signal pin 5 is embedded in the indium 9 and is always in good surface contact with the transparent electrode 2B, so that a stable signal current can always be extracted from the transparent electrode 2B.

In the present invention, in addition to tin oxide, indium oxide can also be used as the transparent electrode.

In order to more completely connect the transparent electrode 2B made of tin oxide and the indium 9, a film 10 of gold or the like, which has particularly good adhesion to indium, is formed on the transparent electrode by a method such as vapor deposition, as shown in FIG. By doing so, the connection with indium can be made even better.

As described above, according to the present invention, when taking out a plurality of signal currents, the connection between the signal pin and the transparent electrode is made completely, thereby making it possible to take out the plurality of signal currents stably.

[Brief explanation of the drawing]

FIG. 1 is a simplified diagram of a portion of an image pickup tube using a photoconductive surface from which a plurality of signal currents are extracted. FIG. 2 is a diagram of the vicinity of a transparent electrode in a conventional example from which a plurality of signal currents are extracted using a bunal pin. FIG. 3 is a sectional view of the same. FIG. 4 is a diagram of the vicinity of a transparent electrode from which a plurality of signal currents are extracted according to the present invention. FIG. 5 and FIG. 6 are the same sectional views. 1 is a transparent face plate, 2 is a transparent electrode, 5 is a signal pin, 9 is metal indium, and 10 is a gold vapor deposited film.

Claims (1)

[Claims] 1. An imaging tube in which a photoconductive film is formed on a transparent electrode formed on a transparent face plate, and the surface is scanned by an electron flow from an electron gun to extract a signal current from the transparent electrode. Furthermore, an image pickup tube characterized in that at least one signal current is extracted by a signal pin through a soft conductive material that has good contact with the transparent electrode. 2. The imaging tube according to claim 1, characterized in that a metal that is easily alloyed with a soft conductive material that has good contact with the transparent electrode is attached to the transparent electrode.