Exposure control device for a photographic enlarger

Details Exposure control device for a photographic enlarger Exposure control device for a photographic enlarger

1984-01-12

1985-05-21

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2770

Patent

active

045182507

ABSTRACT:
An exposure control device for a photographic enlarger includes a printing control means for controlling the exposure of a printing section having a light source. When a printing start means is manually operated, the printing control means actuates the printing section to start the exposure of printing and actuates an attained exposure amount outputting means to measure at each segment of time an amount of exposure attained from the start of printing to that time. A suspending signal for temporarily stopping the exposure and the measurement is generated and fed to the printing control means, when a ratio of the attained exposure to a desired exposure reaches an integer multiple of a fixed ratio of exposures. The exposure of the printing section and the measurement of the attained exposure amount are suspended in response to this suspending signal, and an operator can perform a preparatory operation for the shading and/or burning-in printing process during the suspension.

REFERENCES:
patent: 2460443 (1949-02-01), Benton
patent: 3989374 (1976-11-01), Latka et al.
patent: 4025190 (1977-05-01), Hughes
patent: 4440489 (1984-04-01), Yuasa
Article "Photo Timer" on pp. 11-13 of Electronics Today International, Sep. 1975 issue.

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