Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1987-10-06
1989-05-16
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
3541951, 354402, 250201, G03B 300, G03B 310
Patent
active
048314056
ABSTRACT:
An auto-focus arithmetic device suitable for use in a photographic camera is provided. The device includes a photographic lens which is movable along a predetermined optical axis and a CCD for detecting light coming from a subject of interest through the lens. An arithmetic unit for determining the direction and amount of movement of the lens with respect to the subject of interest based on a detection signal from the CCD is provided. The arithmetic unit includes an integer portion calculating sub-unit for calculating an integer portion of the detection signal and a fractional portion calculating sub-unit for calculating a fractional portion of the detection signal. The fractional portion calculating sub-unit remains deactivated as long as the detected amount of discrepancy from the in-focus condition is larger than a predetermined level; however, it is activated when the detected amount of discrepancy becomes equal to or less than the predetermined level. In this manner, in accordance with the present invention, the integer and fractional portion calculating sub-units are used alternately.
REFERENCES:
patent: 4382665 (1983-05-01), Eguchi et al.
patent: 4422746 (1983-12-01), Meguro et al.
patent: 4572643 (1986-02-01), Akashi
patent: 4573784 (1986-03-01), Suzuki
Aoki Kazumasa
Hata Daisuke
Hatase Takayuki
Iguchi Susumu
Ohno Yoshimi
Perkey W. B.
Ricoh & Company, Ltd.
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