Illumination – Photographic lighting – Including specific light modifier
Reexamination Certificate
2006-05-30
2006-05-30
Alavi, Ali (Department: 2875)
Illumination
Photographic lighting
Including specific light modifier
C362S003000, C362S011000
Reexamination Certificate
active
07052151
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 device1according to the present invention has a light source comprising a plurality of LED elements2generating 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 case3having a lens on which linear fresnel cuts3ahave been applied in a linear direction parallel to the arrangement direction is mounted on the LED element2, and upon lighting of the LED element2, 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 cuts3aincrease 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.
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Iritono Kimihiro
Kato Shigekazu
Sekido Keizo
Terada Toshiyuki
Alavi Ali
Dickstein Shapiro Morin & Oshinsky LLP.
Sawhney Hargobind S.
Stanley Electric Co., Ltd
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