Autofocus adjustment apparatus and interchangeable lens device f

Details Autofocus adjustment apparatus and interchangeable lens device f Autofocus adjustment apparatus and interchangeable lens device f

1993-12-15

1995-07-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354402, G01J 120

Patent

active

054302870

ABSTRACT:
An autofocus adjustment apparatus for use on a camera and an interchangeable lens device, such as a lens barrel, for an autofocus adjustment apparatus, having increased responsiveness and lens drive accuracy and which can correspond to various photographic optical systems. A small drive amount is calculated for every small defocus amount and an optical lens is driven in relation to this small drive amount.

REFERENCES:
patent: 4536072 (1985-08-01), Tamiguchi et al.
patent: 4837594 (1989-06-01), Nakamura et al.
patent: 4931820 (1990-06-01), Matsuzawa et al.
patent: 5036348 (1991-07-01), Kusaka
patent: 5243375 (1993-09-01), Ishida et al.

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