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:
May. 30, 2006
Filed:
Sep. 16, 2003
Toshiyuki Terada, Tokyo, JP;
Keizo Sekido, Tokyo, JP;
Shigekazu Kato, Tokyo, JP;
Kimihiro Iritono, Tokyo, JP;
Toshiyuki Terada, Tokyo, JP;
Keizo Sekido, Tokyo, JP;
Shigekazu Kato, Tokyo, JP;
Kimihiro Iritono, Tokyo, JP;
Stanley Electric Co., Ltd, Tokyo, JP;
Abstract
Light source devices for photography using LED elements as a light source known in the prior art provide insufficient quantity of light, and the inability to avoid size increases in order to generate a sufficient quantity of light has been problematic. A photography light source deviceaccording to the present invention has a light source comprising a plurality of LED elementsgenerating white light or light of the three primaries and arranged in one or more rows parallel with the direction of the longer side of the photograph, a casehaving a lens on which linear fresnel cutshave been applied in a linear direction parallel to the arrangement direction is mounted on the LED element, and upon lighting of the LED element, drive is performed with a current of between 3 and 50 times the magnitude of the rated current thereof and a lighting duration of between 10 and 600 msec. Accordingly, the linear fresnel cutsincrease the efficiency of illumination by distributing light uniformly over the area of exposure, and in addition, a large current is applied in a pulse type pattern as the drive current, thus solving the problems by allowing sufficient brightness to be achieved with no associated increases in size.