Opaque adapter for overhead projector

Details Opaque adapter for overhead projector Opaque adapter for overhead projector

1988-12-08

1990-06-05

Haroian, Harry N.

Optics: image projectors

Light shield, mask, hood, or diaphragm

353DIG4, 353119, 353 66, G03B 2108, G03B 2128

Patent

active

049308866

ABSTRACT:
An opaque adapter for an overhead projector uses a hood with clamshell doors to provide generous access to the projector stage during transparency projection and efficient light shielding during opaque projection. The clamshell doors are oriented upon hinges slanted to the vertical so as to rise away from the stage when opened. Spring devices offset the gravitational forces on the doors, allowing rapid motor actuation with very little power. Dual dichroic optics maintain a cool stage despite high light intensity, and internal baffles further increase brightness.

REFERENCES:
patent: 2596393 (1952-05-01), Fitzgerald
patent: 2598814 (1952-06-01), McAfee
patent: 2600345 (1952-06-01), Venditti
patent: 2852980 (1958-09-01), Schroder
patent: 3376086 (1968-04-01), Fisher
patent: 3512883 (1970-05-01), Noble
patent: 3825333 (1974-07-01), Dali et al.

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