Overhead projector

Details Overhead projector Overhead projector

1989-06-16

1990-11-06

Haroian, Harry N.

Optics: image projectors

Housing

353DIG3, 353 99, G03B 2110

Patent

active

049681346

ABSTRACT:
An overhead projector comprises, a main body, a light source disposed in the main body for emitting a light, a Fresnel lens disposed on an upper surface of the main body, an internal mirror for reflecting the emitted light toward the Fresnel lens, disposed rotatably in the main body such that a portion of the internal mirror is protruded from a bottom of the main body to an outside of the main body upon a use of the projector and is accommodated in the main body upon a non-use of the projector, an arm connected with the main body at one longitudinal end thereof, a projection lens held by the other longitudinal end of the arm for focusing the reflected light which has passed through the Fresnel lens and an original for a projection placed on the Fresnel lens, and a projection mirror for directing the focused light from the projection lens toward a screen.

REFERENCES:
patent: 3167998 (1965-02-01), Appeldorn et al.
patent: 4629299 (1986-12-01), Okano et al.
patent: 4647166 (1987-03-01), Franken et al.
IBM Tech Disc. Bul. Compact Expandable Viewer by R. E. Cox vol. 13, #12 5/71.

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