Light box with improved spectral response for CCD imager

Details Light box with improved spectral response for CCD imager Light box with improved spectral response for CCD imager

1988-10-31

1989-09-05

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358229, H04N 314

Patent

active

048644080

ABSTRACT:
A charge coupled device image sensor in a film-to-video player senses light transmitted through a frame of film from a light box. The light box houses a tungsten halogen bulb at one end and a diffuser at the opposite end adjacent the film. An intermediate opaque pyramidal surface, or "flag", prevents direct light from the bulb reaching the diffuser. The apex of the pyramidal flag is centered with and aimed at the filament of the bulb, and has a hole through it the size of the filament, permitting a small beam of light directly from the filament to reach the center of the diffuser. All interior box surfaces (including the flag) are blue, to compensate for the chrominance response of the charge coupled device sensor. The pyramidal flag and the hole in the pyramidal apex provides a uniform light intensity across the surface of the diffuser.

REFERENCES:
patent: 4506300 (1985-03-01), Fearnside
patent: 4554585 (1985-11-01), Carlson
patent: 4570179 (1986-02-01), Lees
patent: 4805028 (1989-02-01), Nishioka et al.

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