Optical: systems and elements – Deflection using a moving element – By moving a reflective element
Patent
1997-02-27
1998-08-18
Font, Frank G.
Optical: systems and elements
Deflection using a moving element
By moving a reflective element
359855, 359872, 355 37, 345 84, G02B 2608, G02B 2612
Patent
active
057965080
ABSTRACT:
A digital micromirror device is provided with micromirrors disposed in matrix form. Each micromirror is changed between a valid reflection state and an invalid reflection state according to mirror drive data. In the valid reflection state, reflected spot light is guided to an image forming optical path and a photographic paper is exposed. In the invalid reflection state, reflected spot light is guided to an eliminating optical path. A photodetector performing a photometry of the spot light is disposed at the eliminating optical path. The micromirrors are set in the invalid reflection state one by one and the reflected spot light is measured by the photodetector so as to examine the existence of a faulty micromirror or scatter of reflectance of the micromirror. All micromirrors are set in the invalid reflection state at the same time and an output of the photodetector is inspected so as to examine whether light amount of a light source is proper or improper.
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Font Frank G.
Fuji Photo Film Co. , Ltd.
Smith Zandra V.
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