Microfilm enlarging apparatus

Details Microfilm enlarging apparatus Microfilm enlarging apparatus

1976-12-23

1978-08-29

Griffin, Donald

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2774, G03B 2776

Patent

active

041100395

ABSTRACT:
This invention relates to a microfilm-enlarging apparatus comprising means adapted to provide a source of light to expose photosensitive material through a microfilm to be enlarged, sensing means adapted to sense the intensity of the light transmitted, in use of the apparatus, by the entire area of the microfilm to be enlarged substantially only within a wavelength range of from 360 to 560 nm, and control means adapted to control the total amount of light to which the photosensitive material is exposed in an enlargement step in dependence upon the value of the intensity sensed by the sensing means.

REFERENCES:
patent: 2701196 (1955-02-01), Conrad
patent: 2794366 (1957-06-01), Canaday
patent: 2995978 (1961-08-01), Glandon et al.
patent: 3241441 (1966-03-01), Barbour et al.
patent: 3293033 (1966-12-01), Maddock et al.
patent: 3469914 (1969-09-01), Thomson
patent: 3523728 (1970-08-01), Wick et al.
patent: 3554642 (1971-01-01), Zahn
patent: 3841752 (1974-10-01), Terajima et al.

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