Focusing method for digital camera using plural spatial...

Details Focusing method for digital camera using plural spatial... Focusing method for digital camera using plural spatial...

2007-06-05

2007-06-05

Perkey, W. B. (Department: 2851)

Photography

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

With electronic filtering

C348S355000

Reexamination Certificate

active

11106807

ABSTRACT:
An automatic focusing method includes the following steps: providing a digital camera module, which includes a lens member, an image sensor member, a distance-measuring member, a signal-processing member, a drive control member, and a drive member; measuring an object distance using the distance-measuring member, and transmitting the object distance to the signal-processing member for generating a control signal; the drive control member driving the drive member according to the control signal; and the drive member driving the image sensor member or the lens member to a position determined by the control signal. The step of providing the digital camera module includes: providing the lens member, the image sensor member and the distance-measuring member; measuring a depth of focus of the lens member; establishing a range of error of movement of the drive member; and selecting a suitable signal-processing member, drive control member, and drive member.

REFERENCES:
patent: 5323204 (1994-06-01), Wheeler et al.
patent: 2003/0063212 (2003-04-01), Watanabe et al.
patent: 2004/0145671 (2004-07-01), Wang
patent: 01202112 (2001-12-01), None

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