Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1991-09-16
1993-01-05
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502012, G03B 1336
Patent
active
051775255
ABSTRACT:
According to the method of the present invention, in an overlap servo auto focus system wherein the accumulation by a charge accumulation type sensor for obtaining the defocus amount of a lens, the calculation of the defocus amount based thereon and the driving of the lens under servo control conforming to the calculated defocus amount are effected at a time in an overlapping manner, design is made such that in-focus judgment is not done when the amount of lens driving during the accumulation time of the charge accumulation type sensor is greater than a predetermined threshold value. In a modification, design is made such that in-focus judgment is not done when the amount of lens driving during the time from the start of the accumulation by the charge accumulation type sensor till the calculation of the defocus amount is greater than a predetermined threshold value. In another modification, design is made such that in-focus judgment is not done when the amount of lens driving during the time from a certain point of time in the course of the accumulation by the charge accumulation type sensor till the calculation of the defocus amount is greater than a predetermined threshold value.
REFERENCES:
patent: 4460261 (1984-07-01), Eguchi et al.
patent: 4791445 (1988-12-01), Akada et al.
patent: 4920370 (1990-04-01), Taniguchi et al.
patent: 4956659 (1990-09-01), Hamada et al.
Nikon Corporation
Perkey W. B.
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