Telephoto lens assembly for overhead projector

Details Telephoto lens assembly for overhead projector Telephoto lens assembly for overhead projector

1987-06-01

1988-05-17

Corbin, John K.

G02B 1708, G02B 934

Patent

active

047446412

ABSTRACT:
The invention consists of a four-element telephoto projection lens for use in conventional overhead projectors, which lens assembly affords an extended projection distance from the lens to the projection screen while retaining the same back focus as conventional two-element projection lenses for overhead projectors.

REFERENCES:
patent: 3126786 (1964-03-01), Appeldorn
patent: 3334957 (1967-08-01), Field
patent: 4350415 (1982-09-01), Conrad
patent: 4380374 (1983-04-01), Vanderwerf

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