Overhead projector with image direction adjusting device

Details Overhead projector with image direction adjusting device Overhead projector with image direction adjusting device

1992-09-23

1993-06-29

Cuchlinski, Jr., William A.

Optics: image projectors

Film gate

353 27R, 353 23, 353DIG3, G03B 2118

Patent

active

052238709

ABSTRACT:
The overhead projector include a lower plate disposed on a housing of a main body of the overhead projector. The lower plate can rotate about a light axis of a condenser lens and has a transparent portion facing at least the condenser lens. A projection lens is supported above the condenser lens and an upper plate is disposed under the projection lens. The upper plate is supported vertically resiliently with respect to the projection lens and has a transparent portion at least facing the condenser lens. The upper plate is able to rotate about a light axis of the condenser lens. When images projected on a screen lie sideways or upside down, the upper and lower plates which are interposing a film therebetween are rotated. Thus, the directions of the projected images are correctly adjusted.

REFERENCES:
patent: 3807850 (1974-04-01), Ozeki
patent: 4133605 (1979-01-01), Wiggin
patent: 4184754 (1980-01-01), Ozeki
patent: 4989330 (1991-02-01), Ozeki
patent: 5013148 (1991-05-01), Ozeki

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