Automated photographic contact printing system

Details Automated photographic contact printing system Automated photographic contact printing system

1991-06-03

1993-07-13

Rutledge, D.

Photocopying

Contact printing

Light monitoring exposure control

G03B 2780

Patent

active

052278409

ABSTRACT:
A photographic contact printing system comprises a data base in which certain exposure parameters (e.g., spectral response, sensitivity, dot-growth factor, nominal exposure value and overlay factor) of a variety of different photosensitive recording elements are stored. Upon selection of any one of such recording elements by a printer operator, a microprocessor automatically controls an exposure source (e.g. an electrically energizable lamp) to provide a pre-programmed exposure of the selected recording element. During exposure of the recording element, a logic and control unit receives a time-varying signal representing the instantaneous spectral radiance of the exposure source. The LCU integrates the exposure produced by the source until the integrated exposure matches a nominal (or an adjusted nominal) value, at which time the exposure is terminated. Preferably, the LCU is programmed to produce an adjusted nominal exposure value based on various exposure-affecting inputs made by the printer operator, including percent dot (or line) change, source power level, number and density of overlays and filters, percent diffusion, etc. As a result of the invention, the process of determining proper exposure for a plurality of photosensitive recording elements under a variety of exposure conditions is greatly simplified.

REFERENCES:
patent: 4161363 (1979-07-01), Kahle
patent: 4318613 (1982-03-01), Waiwood
patent: 4526463 (1985-07-01), Hickey et al.
patent: 4641200 (1987-02-01), Shoji et al.
patent: 4949122 (1990-08-01), Jones et al.
EP,A,0023709 *(The Perkin-Elmer Corporation) Feb. 11, 1981.

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