Auxiliary lens system for overhead projectors

Details Auxiliary lens system for overhead projectors Auxiliary lens system for overhead projectors

1980-09-02

1982-09-21

Corbin, John K.

350445, G02B 1502, G02B 1700

Patent

active

043504159

ABSTRACT:
A pair of lenses placed one on each side of the projection head of a standard overhead projector can be utilized to change the focal length of the lens from 14 inches to 20 inches and produce the same image size at a projection distance of 15 feet as at a projection distance of only 9.4 feet.

REFERENCES:
patent: 3126786 (1964-03-01), Appeldorn
patent: 3357775 (1967-12-01), Appeldorn et al.
patent: 3408135 (1968-10-01), Appeldorn et al.
patent: 3675998 (1972-07-01), Wilton

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