Image reading apparatus

Details Image reading apparatus Image reading apparatus

1987-12-24

1989-07-04

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 355 69, G03B 2772

Patent

active

048455318

ABSTRACT:
An image reading apparatus for reading a transparent film has a light source, an exchangeable adjusting board corresponding to the transmission factor of the film, an imaging device for receiving and imaging the light passing through the adjusting board and the film, a comparison function for detecting the output of the imaging device and comparing the output of the imaging device with a predetermined output level, a control device for outputting power source control signals in response to the output of the comparison device, and a power source for energizing the light source in response to the power source control signals. Whereby, the adjusting board is imaged before the film is imaged by the imaging device, and in case the light amount of the light source is not adequate for the film, the extent of energizing the light source is adjusted for adequately imaging the film.

REFERENCES:
patent: 4647961 (1987-03-01), Kammoto et al.
patent: 4710019 (1987-12-01), Terashita
patent: 4731661 (1988-03-01), Nagano
IBM Technical Disclosure Bulletin, vol. 22, No. 8A, Jan. 1980, pp. 3131-3132.

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