Optical composing stage

Details Optical composing stage Optical composing stage

1982-02-05

1984-05-22

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Detailed holder for original

355126, G03B 2762

Patent

active

044505361

ABSTRACT:
An improved optical composing stage is disclosed which has a variable-area aperture including a plurality of aperture-defining blades which are angled at their leading edges so that light incident thereon from a light source is directed out of the field of view of a recording medium, whereby image flaring due to edge reflection is prevented. The optical composing stage further comprises a composite structure made up of parallel plates. Convenient horizontal angular alignment adjustment of the plates is obtained in that a locating pin on a lower plate extends upward into a locating groove formed in the underside of a rotatable skew adjustment knob. The stage further includes a plurality of spaced object planes which provide for simultaneous imaging of a plurality of negatives, each separately controllable as to whether it is in focus or out of focus.

REFERENCES:
patent: 1893156 (1933-01-01), Bern
patent: 3704946 (1972-12-01), Brault et al.
patent: 3972613 (1976-08-01), Plumadore
patent: 4095895 (1978-06-01), Seelen et al.

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