Projection system

Details Projection system Projection system

1978-05-08

1980-01-15

Haroian, Harry N.

Optics: image projectors

Lens support

Lens position adjustable

G03B 502

Patent

active

041836367

ABSTRACT:
A projector for motion pictures or slides has a varifocal objective with a positive front component, an axially slidable negative intermediate component and a fixed positive rear lens group. The front component, or at least its foremost lens member, has a lens mount which is displaceable along a track substantially transverse to the optical axis; the track may be curved with its convex side facing the projection screen. A diaphragm just behind the front component has an aperture barely exceeding the diameter of the intermediate component whereas the front component (or its transversely displaceable part) is radially extended past the diaphragm aperture so as to register with it in every position.

REFERENCES:
patent: 1996054 (1935-04-01), Bowen
patent: 3134295 (1964-05-01), Brown et al.
patent: 3506329 (1970-04-01), Weaver

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