Lens assembly provided with an automatic focusing device

Details Lens assembly provided with an automatic focusing device Lens assembly provided with an automatic focusing device

1981-07-06

1983-12-27

Gellner, Michael L.

G03B 310

Patent

active

044227400

ABSTRACT:
An interchangeable lens assembly comprises a phototaking lens system for imaging an object, an automatic focusing device for detecting the object distance and outputting a signal for moving the lens system to an in-focus position, and a focus adjusting member for moving the lens system along the optical axis. The automatic focusing device includes a distance detector, a motor for generating a drive force to drive the lens system in accordance with an output signal from the distance detector, and a transmission for transmitting the drive force. The focus adjusting member is connected to the lens system and to the transmission, and the lens system is moved in accordance with either the manual rotation of a manually operated portion of the focus adjusting member about the optical axis or by the drive force from the motor through the transmission.

REFERENCES:
patent: 4057327 (1977-11-01), Kumazawa
patent: 4160590 (1979-07-01), Reynard
patent: 4176935 (1979-12-01), Smith
patent: 4272174 (1981-06-01), Teramoto et al.
patent: 4283131 (1981-08-01), Ohnuki et al.
patent: 4299460 (1981-11-01), Hasegawa
patent: 4309077 (1982-01-01), Tomori

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