Enlarger lens system having stop-value scale illuminating mechan

Details Enlarger lens system having stop-value scale illuminating mechan Enlarger lens system having stop-value scale illuminating mechan

1978-09-12

1980-01-15

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

354198, 355 63, G03B 2752

Patent

active

041836618

ABSTRACT:
An enlargement lens system has a light guide element positioned in the gap between the outer periphery of a rear lens group frame and a lens mount. A dispersion lens is provided on a portion of the rear lens and a transmission window is disposed on the rear lens frame. Light inside the effective area of the lens passes through the dispersion surface and the transmission window onto the light guide. The reflex surface on the guide reflects light onto the lens stop-value scale.

REFERENCES:
patent: 2985067 (1961-05-01), Hauptvogel et al.
patent: 3058408 (1962-10-01), Jehmlich et al.
patent: 3997264 (1976-12-01), Noguchi et al.

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