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:
Sep. 24, 1991
Filed:
Nov. 14, 1989
Yoshihiko Mizushima, Shizuoka, JP;
Kazutoshi Nakajima, Shizuoka, JP;
Toru Hirohata, Shizuoka, JP;
Takashi Iida, Shizuoka, JP;
Yoshihisa Warashina, Shizuoka, JP;
Kenichi Sugimoto, Shizuoka, JP;
Hirofumi Kan, Shizuoka, JP;
Hamamatsu Photonics Kabushiki kaisha, Shizuoka, JP;
Abstract
A plurality of ultra-high speed light receiving elements are provided each of which has two rectifier junctions being connected to each other opposite in polarity and has a substantially symmetrical electrode arrangement. A bias voltage is applied to each of the light receiving elements from one or a plurality of power sources. Electrical signals produced by the light receiving elements in response to input optical pulse signals are superposed on one another to produce one or a plurality of output electrical signals representing a predetermined logic operation with respect to the input optical pulse signals. Depending on the arrangement of its elements, the optical logic operation system functions as an OR circuit, AND circuit, NOT circuit, EXCLUSIVE OR circuit, or half-adder circuit.