Overhead projector

Details Overhead projector Overhead projector

1994-08-29

1996-03-05

Dowling, William C.

Optics: image projectors

Episcope

Reflector between lamp and screen

353DIG4, 353 65, G03B 2128

Patent

active

054972078

ABSTRACT:
An overhead projector that irradiates light onto an object or a sheet of paper, focuses the light reflected therefrom with a focusing lens, isolates ultraviolet or infrared rays having a specific wavelength among the focused light via a filter, forms an image by irradiating the isolated light onto an image former, and projects the image onto a projection screen by irradiating visible light onto the image former whereby the image is enlarged and projected via a projection lens to thereby obtain a more clear image.

REFERENCES:
patent: 5214457 (1993-05-01), Takanashi et al.
patent: 5231433 (1993-07-01), Yoshida et al.
patent: 5325137 (1994-06-01), Konno et al.
patent: 5414481 (1995-05-01), Fujioka et al.

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