Illumination apparatus and image projection apparatus using...

Details Illumination apparatus and image projection apparatus using... Illumination apparatus and image projection apparatus using...

2007-08-07

2007-08-07

Dowling, William C. (Department: 2851)

Optics: image projectors

Lamp control

C353S094000, C353S031000

Reexamination Certificate

active

11005388

ABSTRACT:
An illumination apparatus which applies light from light emitting members to a region to be illuminated. The apparatus includes an emitted light quantity control unit which controls emitted light quantities of the members, and a light transmissibility changing unit which controls transmissibility of each light path which transmits output light of the light emitting member to the region. The controls of the emitted light quantity control unit and the light transmissibility changing unit are performed in such a manner that an illuminative light quantity in the region during intermittent lighting of a predetermined number of light emitting members which are some of the light emitting members at a driving current value larger than a rated current in a predetermined period is larger than an illuminative light quantity in the region during constant lighting of the predetermined number of light emitting members at a rated driving current in the predetermined period.

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