Objective lens holding arrangement for a micro-film reader

Details Objective lens holding arrangement for a micro-film reader Objective lens holding arrangement for a micro-film reader

1978-10-20

1980-08-05

Evans, F. L.

Optics: image projectors

Plural projection paths with single light source

350287, 353 81, 353101, G02B 704, G02B 718

Patent

active

042159156

ABSTRACT:
An objective lens supporting arrangement for microfilm reader. The objective lens is axially movable and at the same time non-rotatably mounted with respect to a holding tube of the arrangement. An adjusting ring is coaxially mounted with respect to the holding tube and rotatable relative thereto. An angular displacement of the adjusting ring relative to the holding tube effects via cam means an axial adjustment of the objective lens for the purpose of focusing it.

REFERENCES:
patent: 3817601 (1974-06-01), Colaiace
patent: 3951522 (1976-04-01), Hashimoto
patent: 3981574 (1976-09-01), Jesensky et al.
patent: 4030113 (1977-06-01), Obreschkow
patent: 4154510 (1979-05-01), Katagiri

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