Automatic image-density control system

Details Automatic image-density control system Automatic image-density control system

1987-01-27

1989-03-14

Prescott, A. C.

Photocopying

Projection printing and copying cameras

Methods

355 8, 355 14E, 355 25, 355 82, G03G 1500

Patent

active

048128813

ABSTRACT:
An automatic image-density control system for photo-copying the page-to-page content of an open book, in which optimum values (of exposure or development bias) needed for precisely copying the page-to-page content are initially established by performing either continuous pre-scanning of both pages of an open book or pre-scanning of the second page after completing photo-copying of the first page, and then, based on the optimum values thus established in conjunction with the first page content, photo-copying operation for the first page content is executed, and then, based on the optimum values established for the second-page content, photo-copying operation is sequentially executed for the second-page content.

REFERENCES:
patent: 3597074 (1968-07-01), Murgas
patent: 3926518 (1975-12-01), Berry et al.
patent: 4200391 (1980-04-01), Sakamoto et al.
patent: 4306804 (1981-12-01), Sakamoto et al.
patent: 4540279 (1985-09-01), Irie et al.
patent: 4618244 (1986-10-01), Watanabe
patent: 4627712 (1986-12-01), Usami
patent: 4657377 (1987-04-01), Takahashi
Patent Abstract of Japan No. 61-80173, Makita, 4-23-86.

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