Presentation device for overhead projector

Details Presentation device for overhead projector Presentation device for overhead projector

1989-04-25

1990-08-21

Cuchlinski, Jr., William A.

Optics: image projectors

Miscellaneous

353DIG5, 353 61, 350330, G03B 2154

Patent

active

049500724

ABSTRACT:
A presentation device for an overhead projector of this invention includes a frame-shaped casing, a transmissive-type liquid crystal panel fixed in the casing, first and second protective covers mounted on the casing to have predetermined gaps from the liquid crystal panel and to cover both surfaces of the liquid crystal panel, and exhaust fans disposed in the casing. In order to detachably mount the first and second protective covers to the casing, locking pawls and locking pieces which can be elastically deformed are formed on the outer edges of the first and second protective covers, and the notches and fitting holes to which the locking pawls and the locking pieces can be respectively fitted are formed in the casing.

REFERENCES:
patent: 4248508 (1981-02-01), Watkin
patent: 4257695 (1981-03-01), Langworthy
patent: 4787738 (1988-11-01), Joffe

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