Electro-optical transducer
AssigneeSiemens Aktiengesellschaft
InventorsFriedrich Gudden, Herbert Weiss
Life of this patent
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Abstract
An electro-optical transducer which encompasses, within a vacuum tube, a constructional element having an alkali metal and a constructional element having a semi-conductor. The semi-conductor constructional element is rendered insensitive with respect to alkali metals. This is achieved in that the surface of the semi-conductor is at least partly covered with a layer or coating of polyimide.
Claims4
In a gamma-image tube having a vacuum chamber, a photocathode means positioned within said chamber and having an alkali metal therein, a semiconductor means positioned within said chamber in spaced relation to said photocathode means and so as to have a major semiconductive surface thereof facing said cathode means, and a plurality of electrode strips positioned at least on said major semiconductive surface of the semiconductor means so as to define a pattern of electrode-free semiconductive areas;
- the improvement comprising:
- a layer composed of a polyimide positioned on at least said electrode-free semiconductive areas of the major surface of said semiconductor means facing said photocathode, said layer having a thickness of less than 5 .mu.m.
Dependencies are inferred from the claim text.