Method for manufacturing a target for an image pickup tube

Details Method for manufacturing a target for an image pickup tube Method for manufacturing a target for an image pickup tube

1975-01-23

1976-10-12

Smith, Ronald H.

Coating processes

Electrical product produced

Photoelectric

313 94, 313366, 313386, 357 11, 357 16, 427 74, 427 87, 427109, 427126, 427248J, 427255, 427350, 427372R, 427377, 427380, 427419F, B05D 512, B05D 302

Patent

active

039859185

ABSTRACT:
A target for an image pickup tube having high sensitivity, low dark current and low amount of lag-image is manufactured by forming a hetero-junction by the evaporation process. A first layer of ZnS.sub.x Se.sub.1.sub.-x or Zn.sub.u Cd.sub.1.sub.-u S (wherein 0 .ltoreq. x .ltoreq. 1 and 0 .ltoreq. u .ltoreq. 1) is deposited on a light transmitting substrate having a coefficient of linear expansion of 56 .times. 10.sup..sup.-7 /.degree.C - 110 .times. 10.sup..sup.-7 /.degree.C and a second layer of (Zn.sub.y Cd.sub.1.sub.-y Te).sub.z (In.sub.2 Te.sub.3).sub.1.sub.-z (wherein 0.1 .ltoreq. y .ltoreq. 0.9 and 0.7 .ltoreq. z .ltoreq. 1) is deposited on the first layer. The substrate is then heat treated in an inert gas atmosphere or under vacuum at a temperature of 350.degree.-650.degree.C, preferably 500.degree.-600.degree.C for a time period of 5-90 minutes, preferably 5-15 minutes. By effecting second heat treatment at a temperature lower than the first heat treatment temperature, preferably at a temperature of 150.degree.-400.degree.C for 20 minutes - 3 hours, the characteristics of the target are further improved.

REFERENCES:
patent: 3405298 (1968-10-01), Dresner
patent: 3571646 (1971-03-01), Kiuchi
patent: 3755002 (1973-08-01), Hirai
patent: 3858074 (1974-12-01), Fukai

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