Focus detecting device having two selectively movable lenses

Details Focus detecting device having two selectively movable lenses Focus detecting device having two selectively movable lenses

1986-12-30

1988-12-20

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120

Patent

active

047926694

ABSTRACT:
A focus detecting device which is provided with a field lens disposed on the predetermined imaging plane of an objective lens and a plurality of imaging lenses disposed rearwardly of the field lens and in which the images of the imaging lenses are sensed to thereby determine the focus adjusted state of the objective lens. A unit body integrally constitutes the units such as the field lens and the imaging lenses and has a surface for movably supporting the field lens. The unit body also has adjusting device for rotating the imaging lenses relative to the optical axis.

REFERENCES:
patent: 4359282 (1982-11-01), Garrison
patent: 4497561 (1985-02-01), Suzuki
patent: 4523101 (1985-06-01), Tsunekawa
patent: 4536070 (1985-08-01), Shono
patent: 4561750 (1985-12-01), Matsumura
patent: 4563576 (1986-01-01), Matsumura et al.
patent: 4573784 (1986-03-01), Suzuki
patent: 4580042 (1986-04-01), Tokutomi et al.
patent: 4659917 (1987-04-01), Suzuki et al.
patent: 4686360 (1987-08-01), Gorgon
patent: 4694151 (1987-09-01), Yoshimura

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