Enlarging lens barrel

Details Enlarging lens barrel Enlarging lens barrel

1975-07-16

1976-12-14

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

354198, G03B 2752

Patent

active

039972640

ABSTRACT:
An enlarger lens barrel has a cavity provided with an outwardly directed window and a longitudinal bore defining a light passageway between the cavity and the enlarger light source. A diaphragm aperture adjusting ring is rotatable on the barrel and carries a transparent indicator ring provided with aperture designating characters which are movable with the indicator ring across the window. Housed in the cavity is a transparent light guide member having a cylindrically concave radially extending face confronting the bore and a transversely ribbed inside face including longitudinally and slightly radially spaced transverse faces reflecting light incident thereon from the passageway to the window to longitudinally spread the light incident thereon which is transversely diverged by the concave face. The rings are longitudinally shiftable between increment and continuous adjustment positions.

REFERENCES:
patent: 2504254 (1950-04-01), De Grave, Jr.
patent: 2985067 (1961-05-01), Hauptvogel et al.

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