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:
Feb. 26, 2002
Filed:
Nov. 24, 1999
Masayuki Uno, Ina, JP;
Olympus Optical Co., LTD, , JP;
Abstract
A photo-sensor capable of accurate removal of photo-current due to background light when sensing the photo-current due to light projection and having frequency band of photo-current sensing system independent of photo-diode current is disclosed. A transistor having the source connected to the photo-electric converting element for passing photo-current generated in the photo-electric converter. An inverting amplifier includes the input side connected to the juncture between the photo-electric converting element and the transistor for amplifying the output signal from the photo-electric converting element. A signal storing circuit is provided between the source and the gate of the transistor for storing a signal corresponding to the photo-current. A switching element is provided between the output side of the inverting amplifier and the gate of the transistor.