Automatic focusing device and automatic focusing method

Details Automatic focusing device and automatic focusing method Automatic focusing device and automatic focusing method

1994-12-27

1996-03-05

Perkey, W. B.

G03B 1336

Patent

active

054972094

ABSTRACT:
To improve focusing precision and responsiveness in an automatic focusing device, an accurate lens driving amount is found in a short time from a detected defocus amount. A conversion coefficient .gamma.s is calculated by successively correcting a correction coefficient Lm using the next correction coefficient L(m+1) and the defocus amount .DELTA.Bf and by correcting the specific conversion coefficient .gamma. using these correction coefficients and the defocus amount .DELTA.Bf. Driving of the focusing lens is controlled by calculating a driving amount .DELTA.x for the focusing lens from the defocus amount .DELTA.Bf using the conversion coefficient .gamma.s.

REFERENCES:
patent: 4841325 (1989-06-01), Hoshino et al.

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