Enlarger

Details Enlarger Enlarger

1978-03-06

1980-02-19

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Illumination systems or details

G03B 2754

Patent

active

041892291

ABSTRACT:
The invention relates to an enlarger, especially for the production of photographic enlargements or precision screens. The enlarger comprises a head enclosing a light source and a diffusing screen, the light source being disposed behind the diffusing screen, a film slide channel having an exposing opening or window, and an enlarging lens. The light source has the form of an annulus located close to the diffusing screen and arranged such that the diffusing screen or plate surface, seen from the lens, is contained effectively within a projections area being orthogonal to the light source annulus. The light source can be lifted and lowered within the head in order to adjust for substantially uniform light intensity in the projected surface.

REFERENCES:
patent: 1633228 (1927-06-01), Rogers
patent: 2415635 (1947-02-01), Hopkins
patent: 2923812 (1960-02-01), Hauptvogel
patent: 3031922 (1962-05-01), Stadler
patent: 3748037 (1973-07-01), Kulterer et al.

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