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:
Dec. 12, 1989
Filed:
Jun. 16, 1988
Mitsutoshi Kimura, Yokohama, JP;
Masaharu Baba, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A light detector which indicates decrease in the level of ambient light below a prescribed value. The light detector includes a light indicator for radiating light when the level of ambient light decreases below the prescribed value, a light sensor arranged parallel to the light indicator for receiving actual light including ambient light and light from the light indicator for outputting a detection signal corresponding to a level of actual light, and a control circuit for evading effect of the light from the light indicator for controlling the operation of the light indicator while ambient light is below the prescribed level even though the actual light received by the light sensor increases above the prescribed level.