Focus adjustment device and method

Details Focus adjustment device and method Focus adjustment device and method

1995-06-30

1997-09-02

Metjahic, Safet

Photography

With exposure objective focusing means, focusing aid, or...

Having accumulation photoarray and time control means

396104, 396125, 396128, G03B 300, G03B 1300

Patent

active

056642369

ABSTRACT:
A focus adjustment device for a camera includes a focus detection system, a controller including a drive amount calculation section that calculates the amount of lens movement required to focus on a photographic object based on a detected defocus amount, a memory section that stores the detected defocus amount, and an adjusted drive amount calculation section that statistically processes a plurality of stored defocus amounts. The adjusted drive amount calculation section calculates the adjusted drive amount required to properly focus the photographic lens on the subject and prevents unstable movements of the photographic lens in the vicinity of the focus position. The controller drives the photographic lens according to the adjusted drive amount after the commencement of a shutter release operation and before film exposure. In addition, the focus adjustment drive may advantageously utilize image plane positions derived from the defocus amounts and the lens movement to calculate a drive amount and/or an adjusted drive amount, which is particularly desirable for focusing on moving photographic objects.

REFERENCES:
patent: 4783677 (1988-11-01), Hamada et al.
patent: 4792820 (1988-12-01), Norita et al.
patent: 4942418 (1990-07-01), Norita et al.
patent: 4980715 (1990-12-01), Utagawa
patent: 5012267 (1991-04-01), Higashihara
patent: 5019851 (1991-05-01), Azuma et al.
patent: 5060002 (1991-10-01), Ohnuki et al.

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