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Patent Searching and Data


Title:
LIGHT SOURCE DEVICE FOR PHOTOGRAPHIC PRINTER
Document Type and Number:
Japanese Patent JPH04142529
Kind Code:
A
Abstract:

PURPOSE: To shorten a print exposure time and to improve the efficiency by selectively using a mirror box which reduce the quantity of insertion of a dimming filter into an optical path.

CONSTITUTION: There are three kinds of mirror box, whose reflecting surfaces have three kinds of spectral reflection characteristic. When the kind and development conditions of color paper are changed or when a tungsten electric bulb 16 is replaced, the color balance of a light source needs to be adjusted and the quantities of insertion of three kinds of dimming filters are adjusted. When the color paper is changed in kind to paper which is large in the specific sensitivity of the red sensing layer, a cyan filter is inserted into the optical path greatly, but when a box 11 which has a spectral reflection characteristics high in short- wavelength side reflective index is used, the quantity of insertion of the filter is small and light quantity loss is also small. Then when the red light of the electric bulb 16 decreases in specific energy, a yellow and a magenta filter are inserted greatly into the optical path to keep total balance, but when a box 11 which has a spectral reflection characteristic high in long-wavelength side reflection factor is used, the quantity of insertion of the filters are small and the light quantity loss is small.


Inventors:
Takada, Kenji
Application Number:
JP1990000267046
Publication Date:
May 15, 1992
Filing Date:
October 04, 1990
Export Citation:
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Assignee:
FUJI COLOR SERVICE:KK
International Classes:
G02B5/22; G03B27/54; G03B27/73; (IPC1-7): G02B5/22; G03B27/54; G03B27/73