Focusing device for optical system

Details Focusing device for optical system Focusing device for optical system

1982-04-27

1985-06-04

Punter, William H.

Optics: measuring and testing

Focal position of light source

250229, 354 79, 354199, G01J 100, G03B 1318

Patent

active

045211086

ABSTRACT:
A focusing device for optical systems wherein, in order to make it possible to use an image photographing element and to focus an image without vibrating a body, on a light intercepting plate to be rotated in a plane intersecting at right angles with an optical axis around the optical axis in or near an exit pupil or a position conjugate with the exit pupil of an optical system, light intercepting parts and non-light intercepting parts are so arranged as to alternately vary the relative positions of the light intercepting parts and non-light intercepting parts appearing within the pupil whenever the light intercepting plate makes 1/4 rotation. The light intercepting plate is rotated either continuously or intermittently by 1/4 rotation. The light intercepting parts and non-light intercepting parts appearing within the pupil are alternately varied vertically or horizontally within the visual field.

REFERENCES:
patent: 3205767 (1965-09-01), Weber et al.
patent: 3387534 (1968-06-01), Barbieri
patent: 3402637 (1968-09-01), Durst
patent: 4097881 (1978-06-01), Katagiri
patent: 4238157 (1980-12-01), Strauch et al.

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