The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 09, 1989
Filed:
Sep. 09, 1987
Gregory Hirsch, Pacifica, CA (US);
Other;
Abstract
A point projection photoelectron microscope is disclosed. A specimen is enclosed in a photoconductor that is subject to the photoelectric effect. The specimen is positioned on a pedestal in an evacuated chamber. The specimen is bombarded by radiation, either of light, ultraviolet radiation, or soft x-rays. The is in a vacuum chamber and it is highly charged with a negative potential. The vacuum chamber includes a surface sensitive to electron flow for making an image. This surface is a phosphor screen or an image intensifier having the capability to be gated for imaging or not imaging incident electrons or a segmented electron collecting anode for electronic imaging. In operation, a collimated beam of radiation, ranging from light to soft x-rays is projected through a specimen disposed in the photoemitter. An image of the specimen is produced on the photoemitter. The light or x-ray which impact on the photoemitter which produce electrons by the photoelectric effect. The electrons migrate beyond the photoemitter where the electric field at the tip of the photoconductor radially repels the electrons to and towards the imaging surface, typically the image intensifier.