Back-lighted copyboard having unique light attenuator

Details Back-lighted copyboard having unique light attenuator Back-lighted copyboard having unique light attenuator

G - Physics

03

B

95/43

G03B 15/02 (2006.01) G03B 27/62 (2006.01)

Patent

CA 1179176

Abstract A unique light attenuator is positioned between a bank of lamps and the underside of a light diffuser which supports a subject to be photographed in a process camera, such light attenuator comprising a first circular pattern of constant width, constant density lines and a second superimposed pattern of straight lines which compen- sate for nonuniformity of illunination of the subject.

410941

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