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:
Aug. 20, 2013
Filed:
Mar. 26, 2009
Masanao Okawa, Nara, JP;
Hirofumi Takaki, Aichi, JP;
Shin Ukegawa, Kyoto, JP;
Minoru Maehara, Osaka, JP;
Hirofumi Konishi, Osaka, JP;
Masanao Okawa, Nara, JP;
Hirofumi Takaki, Aichi, JP;
Shin Ukegawa, Kyoto, JP;
Minoru Maehara, Osaka, JP;
Hirofumi Konishi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A light emitting device includes: a plurality of light emitting elements configured to emit light when a direct current is supplied thereto; and a direct current power supply circuit configured to supply an electric current of a given level or more to the light emitting elements. The light emitting device further includes: a light emitting element voltage detection circuit configured to detect a voltage applied to the light emitting elements; and a forward/reverse inverting circuit configured, when the light emitting element voltage detection circuit detects an abnormality in a light emitting element, to apply a reverse voltage to the light emitting element in which the abnormality is detected.