Automatic exposure control circuit for photomicrographic apparat

Details Automatic exposure control circuit for photomicrographic apparat Automatic exposure control circuit for photomicrographic apparat

1974-09-03

1976-10-19

Adams, Jr., Russell E.

354 51, 354 60R, 354 60L, 354 79, 354173, G03B 708, G03B 2900, G03B 1910

Patent

active

039874630

ABSTRACT:
An automatic exposure control circuit comprises a pair of lamp circuits for displaying the fact that an automatic exposure is feasible and the exposure period which is automatically determined, as well as an electronic shutter circuit and an automatic shutter release circuit, and optionally a color temperature measuring circuit. The control circuit is associated with a photomicrographic apparatus which takes a picture of a specimen being observed in a microscope. When taking a picture, a photometry is made of light from a specimen being photographed in order to determine initially whether an automatic exposure control is feasible for the specimen, and if it is feasible, to provide an automatic release of an electronic shutter by means of a motor, thereby activating the electronic shutter and also producing a lamp display during the period when the electronic shutter is operating. Optionally, a color temperature of the light from a light source which is used to irradiate the specimen is measured.

REFERENCES:
patent: 3581634 (1971-06-01), Ort
patent: 3596580 (1971-08-01), Rentschler
patent: 3625127 (1971-12-01), Tsuda
patent: 3763755 (1973-10-01), Kuramoto et al.
patent: 3778150 (1973-12-01), Aston
patent: 3798663 (1974-03-01), Wagensonner et al.

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