Exposure determining device for an enlarger

Details Exposure determining device for an enlarger Exposure determining device for an enlarger

1983-08-22

1986-07-22

Hix, L. T.

Photocopying

Projection printing and copying cameras

Multicolor picture

355 68, 356404, G03B 2780

Patent

active

046015710

ABSTRACT:
An enlarger having a light emitting device is provided wherein the amount and color balance of light to be emitted are controlled. The operator can set the amount and color balance of light. The enlarger can measure the amount and color balance of light at a plurality of points within a predetermined plane in which the printing paper is to be located. A first mode of operation can be set which presumes a predetermined standard film set in the enlarger and a second mode of operation can be set wherein a film to be printed is placed in the enlarger. The enlarger is capable of averaging a measured signal to determine an average amount and an average color balance of light wherein these measurements can be utilized to determine a proper amount and color balance of light to be received at the predetermined plane during an enlarging operation.

REFERENCES:
patent: 3640620 (1972-02-01), Shatz et al.
patent: 3813158 (1974-05-01), Zahn et al.
patent: 4205918 (1980-06-01), Kisanuki et al.
patent: 4469437 (1984-09-01), Yuasa et al.

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