| 摘要 |
1,215,298. Semi-conductor devices; image pick-up tubes. ELECTRIC & MUSICAL INDUSTRIES Ltd. 14 March, 1968 [31 March, 1967], No. 14900/67. Headings H1D and H1K. [Also in Division C7] A photoconductive member for use as the target of an image pick-up tube comprises a first layer 3 of lead oxide deposited on to a support 2 in vacuum and a second layer 4 of lead oxide deposited on to the layer 3 in an oxidizing atmosphere. In the illustrated embodiment the support 2 itself comprises a transparent mesa signal plate formed by deposition of a film of stannous chloride in an oxidizing atmosphere on to a glass plate 1. The lead oxide layer 3 is evaporated to a thickness of 0À1-0À4 Á in a vacuum of the order of 5 x 10<SP>-6</SP> torr on to the signal plate which is maintained at a temperature of 20-120‹ C. The second lead oxide layer 4 is evaporated to a thickness of 10-20 Á on to the layer 3 at 100-120‹ C. in an atmosphere of oxygen containing up to 50% by weight of water vapour at a total pressure of the order of 10<SP>-2</SP> torr. The assembly thus formed is sealed to the envelope 5 of an image pick-up tube using indium 7, and a contact ring 6 is provided. |
