Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1986-12-29
1988-06-14
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250234, 355 67, 358293, G01J 135
Patent
active
047513772
ABSTRACT:
In a light beam scanning recording apparatus, a light beam is modulated by a modulator according to image signals and is caused to scan a photosensitive recording material, and the recording material is developed. The apparatus is provided with a signal converting section which converts image signals to be input into the modulator according to a predetermined conversion table so that desired image densities can be obtained on the recording material, a test pattern signal generating section which generates test pattern signals bearing thereon different image densities and inputs them into the modulator, an image density measuring system which measures the image densities of the test pattern on the recording material developed after scanning by a light beam modulated according to the test pattern signals, and a conversion table making section which determines, on the basis of the relation between the test pattern signals and the image densities of the test pattern measured by the image density measuring system and desired image signal-image density characteristics, the image signals corresponding to the image densities obtained by the respective test pattern signals referring to the desired image signal-image density characteristics, thereby obtaining the relation between the image signals and the test pattern signals, and makes the conversion table on the basis of the relation between the image signals and the test pattern signal.
REFERENCES:
patent: 4352553 (1982-10-01), Hirahara
patent: 4544258 (1985-10-01), Takano
patent: 4602156 (1986-07-01), Asai et al.
patent: 4651226 (1987-03-01), Motoori et al.
patent: 4653904 (1987-03-01), Imamura
Ishizaka Hideo
Ohara Yuji
Fuji Photo Film Co. , Ltd.
Ruoff Jessica L.
Westin Edward P.
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