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US 5,291,335 AGranted
Optical equipment having a lens position detector
AssigneeCanon Kabushiki Kaisha
InventorShigeru Ogino
Life of this patent
Estimating the term…
Abstract
An optical equipment is equipped with a compact and high precision lens position detector which has a lens holder guide member which is made of a conductor and is provided with a detection electrode for detecting the position of the lens holder by a change in an electrical capacitance.
Claims10
An optical equipment having a lens position detector, comprising:
- a) a lens holder for holding a lens;
- b) a guide member for slidably supporting the lens holder along an optical axis;
- and
- c) electrical displacement detection means for detecting a position of said lens holder with respect to said guide member by an electrical output, said electrical displacement detection means detecting the position of said lens holder by detecting a change of an electrical capacitance of a capacitor constituted by an electrode formed on at least a part of said guide member and an electrode of conductive member formed on at least a part of said lens holder.
1 more element
An optical equipment having a position detector, comprising:
- a) a guide bar;
- b) a movable member movably supported by said guide bar along an optical axis;
- and
- c) electrical displacement detection means for detecting a position of said movable member by an electrical output, said electrical displacement detection means detecting the position of said movable member by detecting a change of an electrical capacitance of a capacitor constituted by an electrode formed on at least a part of said guide bar and an electrode of a conductive member formed on at least a part of said movable member.
1 more element
Dependencies are inferred from the claim text.