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:
Mar. 26, 1991
Filed:
Aug. 01, 1989
Fumihide Murao, Itami, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A ripple detecting circuit (16) outputs a signal of a '0' level in an ON state of a light source (1) and a signal of a '1' level in an OFF state of the light source (1) when a flashing frequency of the light source (1) exceeds a prescribed frequency, while outputting a signal of a '0' level when the former is less than the latter. A holding circuit (17) outputs a ratio signal from a ratio signal generating means in response to the signal of a '0' level supplied from the ripple detecting circuit (16) while holding and outputting a ratio signal immediately ahead of change from a '0' level into a '1' level in response to the signal of a '1' level. A white balance adjusting circuit (15) performs white balance adjustment in response to an output from the holding circuit (17). When the prescribed frequency is set at a limit flashing frequency of the light source (1) substantially allowing no visual recognition, no white balance adjustment is performed on the basis of a signal in an OFF state of the light source (1) if flashing of the light source (1) cannot be visually recognized.