Automatic focus device and method

Details Automatic focus device and method Automatic focus device and method

1995-06-29

1997-03-25

Metjahic, Safet

Photography

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

Temperature compensating

396133, G03B 300

Patent

active

056149832

ABSTRACT:
An automatic focus state detection device executes focus adjustment by taking environmental factors such as temperature and power source voltage into consideration. The temperature of the camera, the power source voltage of the battery in the camera, and the posture of the camera are detected. Then, lens driving times for six representative points of the driving lens distance are computed. A driving time table is produced, and the defocus amount is detected. Then, based on the updated driving time table, the lens driving time corresponding to the current defocus amount is computed. Finally, the timing for each sequential process from release to start of exposure is determined. In this manner, the driving time is computed by taking the temperature, the power source voltage, and the posture into consideration, and a more accurate estimation of the lens driving time is realized.

REFERENCES:
patent: 4975727 (1990-12-01), Ohtaka et al.
patent: 5162836 (1992-11-01), Ishimaru
patent: 5258795 (1993-11-01), Lucas
patent: 5412448 (1995-05-01), Kunishige
patent: 5481323 (1996-01-01), Egawa et al.
patent: 5495312 (1996-02-01), Takagi

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