Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1988-09-09
1989-10-24
Hix, L. T.
Photocopying
Projection printing and copying cameras
Illumination systems or details
355 69, 355 70, G03B 2772
Patent
active
048765694
ABSTRACT:
Apparatus for performing imagewise exposure of a light-sensitive material whose spectral sensitivity is dependent on wavelength, uses a light source that emits light at a wavelength in the neighborhood of a narrow wavelength range and which is compensated for variations in its optical output level and wavelength on account of the change in the temperature of the light source. A drop in the exposure sensitivity of the light-sensitive material is prevented and a high-quality image is produced by electrically compensating for variations in the optical output level of the light source on the basis of the sensitivity vs. wavelength characteristics of the light-sensitive material and the wavelength vs. temperature characteristics of the light source so that the light source will produce a constant optical output in spite of the variations in wavelength due to the changes in its temperature. The apparatus also produces a high-quality color image having high color densities and good color balance by controlling the optical output levels of respective one of a plurality of sources of light at different wavelengths so that the exposure sensitivities of the light-sensitive material for different lights will not deteriorate in the face of temperature-dependent variations in the wavelengths of light emitted from the respective light sources.
REFERENCES:
patent: 4383758 (1983-05-01), Honda et al.
Fuji Photo Film Co. , Ltd.
Hix L. T,.
Rutledge D.
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