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:
Nov. 28, 1989
Filed:
Jan. 13, 1988
Tatsuo Makishima, Mitaka, JP;
Tadaaki Hirai, Koganei, JP;
Kazutaka Tsuji, Hachioji, JP;
Sachio Ishioka, Burlingame, CA (US);
Takashi Yamashita, Sagamihara, JP;
Keiichi Shidara, Tama, JP;
Junichi Yamazaki, Kawasaki, JP;
Masaaki Aiba, Tokyo, JP;
Hitachi, Ltd. & Nippon Hoso Kasai, Tokyo, JP;
Abstract
A light-detecting device for converting a light to an electrical signal utilizes a charge multiplication function and has a stable gain. The light-detecting device comprises a photo-electric conversion unit for converting a measurement light to an electrical signal, a power supply for applying an electric field to the photo-electric conversion unit, a light source for applying an incident light to the photo-electric conversion unit, signal detection means for detecting the charge converted by the photo-electric conversion unit based on the incident light from the light source, and signal hold means for holding the output signal of the signal detection means at a predetermined level.