Focus adjusting device

Details Focus adjusting device Focus adjusting device

Filed on

1981-12-14

Date issued

1984-04-17

Examiner

Perkey, William B.

Other Related Categories

354401, G03B 300, G03B 1318

Type

Patent

Status

active

Patent number

044430868

Description

ABSTRACT:
In the disclosed focus adjusting device, at least part of an image forming optical system and a focus adjusting mechanism is arranged within a housing attachable to and detachable from a camera body. A focus condition detector includes a photo-sensor disposed on a plane corresponding to the camera image plane, an electrical detection circuit connected to the photo-sensor, and a detecting optical system for forming an image of at least a part of the object on the surface of the photo-sensor. An aural indicator emits a sound to inform a photographer of the condition of the image formed on the surface of the predetermined focal plane as determined by the focusing condition detector.

REFERENCES:
patent: 3743416 (1973-07-01), Widmer et al.
patent: 3776625 (1973-12-01), Fountain
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 3995289 (1976-11-01), Shono
patent: 4048642 (1977-09-01), Saito et al.
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4230401 (1980-10-01), Tokutomi et al.
patent: 4270852 (1981-06-01), Suzuki et al.
patent: 4281917 (1981-08-01), Kitagawa et al.

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