Improvements in or relating to arrangements embodying charge storage pick-up tubes and to charge storage pick-up tubes for use in such arrangements

摘要

899,871. Television pickup tubes. ELECTRIC & MUSICAL INDUSTRIES Ltd. Aug. 20, 1958 [Aug. 20, 1957], No. 26282/57. Class 39(1). A charge-storage pickup tube has a photoemissive surface 4 and light-impermeable means 11 for receiving photo-electrons from the surface, and the surface is scanned by a light spot through the space 10a surrounding the means 11. A symmetrical collection of photo-electrons is achieved. According to a further feature, it is arranged that no part of the scanning light passing through surface 4 can strike primary photo-cathode 2 and cause spurious emission. As described surface 4 is a mosaic upon a semi-conductive glass target 3 receiving a primary electron image from cathode 2 and receiver 11 is a multiplier. The scanning light from scanner 8 may be focused by lens 9 or reflected from a Schmidt system,