An electron-lens for opaque photocathodes.It is possible to employ opaque photocathodes in image tubes having a special electromagnetic lens without the use of special internal image-forming optical lenses or mirrors. The special electron lens, having flat object and image planes, is found to provide excellent quality electron-optical image transfer. Stray light reflection inside the tube is expected to be less serious in this electron lens than in a conventional magnetically focused image tube lens due to the offset image plane, and due to the increased absorption of photons in opaque photocathode applications.
Document ID
19730050103
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Johnson, C. B. (Bendix Research Laboratories Southfield, Mich., United States)
Hallam, K. L. (NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 7, 2013
Publication Date
January 1, 1973
Subject Category
Electronic Equipment
Meeting Information
Meeting: Seminar-in-Depth on Developments in electronic imaging techniques