Optical: systems and elements – Lens – With variable magnification
Patent
1997-05-21
1998-12-29
Epps, Georgia V.
Optical: systems and elements
Lens
With variable magnification
359696, 359823, G02B 1514, G02B 0702
Patent
active
058547118
ABSTRACT:
A lens position control device including a first lens movable along an axis, a first detector detecting a position of the first lens, a second lens movable along the axis, a second detector detecting a position of the second lens, and a controller for driving and controlling the lenses, including storing and position parts. The storing part stores information related to second lens positions with in-focus state retained respectively for a plurality of object distances with respect to each of a plurality of positions of the first lens. The position part is arranged to determine limit positions of a moving range of the first lens, to set at least one limit position (Ta) so a maximum difference between a second lens position where in-focus state is retained for a predetermined distance when the first lens is located at position (Ta) and a second lens position where in-focus state is retained for the predetermined distance when the first lens is located at another position (Za) coincides with a maximum value of contents in the storing part, and to cause the stored plurality of positions of the first lens within a range (M-T) which is smaller than the entire range of the first lens and extends toward another limit position (Wa) of the range from position (Ta) to correspond to positions determined on the basis of a moving amount of the first lens stored beforehand in the storing part from position (Ta).
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Canon Kabushiki Kaisha
Epps Georgia V.
Mack Ricky
LandOfFree
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