Method and a measuring apparatus for determining the exposure ti

Details Method and a measuring apparatus for determining the exposure ti Method and a measuring apparatus for determining the exposure ti

1988-12-14

1990-04-24

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 77, G03B 2780

Patent

active

049203789

ABSTRACT:
A method for determining the exposure time in photographic copying includes measuring the light intensity at different measuring points of the projected picture of the original to be copied for an initial copying light intensity, and forming a mean value of the light intensity values measured at such points; the exposure time for a current copying light intensity is determined by modifying the aforementioned mean value with a proportional action factor corresponding to the ratio of the light intensity value measured at a selected one of the measuring points for the current copying light intensity relative to the light intensity value measured at the same point for the initial copying light intensity. An apparatus for determining the exposure time in accordance with such method includes a microprocessor which determines the ratio of the aforementioned light intensity value measured at the selected measuring point for the current copying light intensity relative to the value measured at the same point for the initial copying light intensity; the microprocessor determines the exposure time as a result of the aforementioned mean value as modified by the aforementioned ratio.

REFERENCES:
patent: 4236818 (1980-12-01), Fauchier, II

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