Auto focus camera

Details Auto focus camera Auto focus camera

1999-03-05

2000-07-25

Perkey, W. B.

Photography

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

Processing circuit

348356, 2502017, G03B 1336, G02B 704

Patent

active

060945370

ABSTRACT:
An auto focus camera includes a motor drive circuit. This motor drive circuit causes an AF lens to move by a first predetermined amount a time. A micro-computer determines AF evaluation values at respective lens positions. The AF evaluation values thus determined have a mountain-like characteristic form with a focal point as a summit. The micro-computer detects a maximum AF evaluation value and two AF evaluation values smaller than that value, and determines a deviation of a maximum evaluation position corresponding to the maximum AF evaluation value from a focal point. If the deviation is small, the micro-computer takes the maximum evaluation position as an optimal position. On the other hand, if the deviation is large, the micro-computer takes as an optimal position a position deviated by a second predetermined amount from the maximum evaluation position.

REFERENCES:
patent: 4600832 (1986-07-01), Grund
patent: 4903135 (1990-02-01), Ohtake et al.
patent: 5249058 (1993-09-01), Murata et al.
patent: 5566380 (1996-10-01), Honma
patent: 5757429 (1998-05-01), Haruki

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