Automatic focussing attachment for photographic enlargers

Details Automatic focussing attachment for photographic enlargers Automatic focussing attachment for photographic enlargers

1974-06-12

1976-11-02

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 63, G03B 2736

Patent

active

039893731

ABSTRACT:
An automatic focussing attachment for photographic enlargers for lengthening and shortening the length of the enlarger bellows to automatically focus the lens as the enlarger is raised and lowered to vary the size of the image. A pivoted link of variable effective length has one end connected to a point fixed with respect to the base of the enlarger and the opposite end portion connected to the focussing knob of the enlarger so that as the enlarger is raised and lowered on its support column the focussing knob will be rotated to maintain the focus of the lens. The variable effective length link has several forms including a plurality of pivoted leaves and a sliding telescoping mounting.

REFERENCES:
patent: 552259 (1895-12-01), Peckinpaugh et al.
patent: 1423997 (1922-07-01), Callier
patent: 1793623 (1931-02-01), Konieczny
patent: 3371577 (1968-03-01), Yatera
patent: 3445162 (1969-05-01), Klatt

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