Projection device

Details Projection device Projection device

1980-07-08

1983-09-06

Arnold, Bruce Y.

Photocopying

Contact printing

Light boxes

350589, 355 50, G02B 2762, G03G 1504

Patent

active

044025726

ABSTRACT:
This specification discloses a projection device in which bar lenses of plastic, each having a great length in the direction of its optical axis as compared with its effective diameter, of the lenses are arranged in the form of a predetermined array. The bar lenses are shielded from the outside atmosphere by a holding member capable of easily setting the lenses. Further, transparent plates, such as glass plates or the like, are provided at the incidence end and the emergence end to seal the holding member, so that there occurs no deterioration of the predetermined optical performance resulting from variations in the environmental humidity which would otherwise cause variations in the plastic material.

REFERENCES:
patent: 3503666 (1970-03-01), Moore et al.
patent: 3580675 (1971-05-01), Hieber et al.
patent: 4168900 (1979-09-01), Adachi

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