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. 10, 1994
Filed:
Jun. 02, 1992
Jan S Iwanczyk, Los Angeles, CA (US);
Thomas T Lewis, Beverley Hills, CA (US);
R Michael Madden, Newbury Park, CA (US);
Advanced Photonix, Inc., Camarillo, CA (US);
Abstract
A small, rugged photomultiplier tube is achieved by closely spacing a large area avalanche 'photodetector' with respect to a photocathode in an opaque casing having a window for incident light. The photocathode and the avalanche photodetector have comparable areas and are closely spaced. The avalanche photodetector includes a PN junction which as to be close to the surface of the detector to maximize the response to electrons and reduce any direct response to light. The need for an electrostatic lens to focus electrons onto the small target characteristic of prior art photomultiplier tubes is obviated.