Patent ID: 7424215
Filing Date: 2008-09-09
Classification: G02B,G03B

Abstract:
1. A lens device comprising: a lens frame for holding a lens; a shaft member disposed in parallel to an optical axis of said lens; a driving device for applying a driving force to said shaft member to move said lens frame in a direction of said optical axis; a connector for connecting said shaft member and said lens frame to transmit said driving force to said lens frame; a guide member disposed in parallel to said optical axis to guide said lens frame moving in the direction of the optical axis; a first detection member disposed at a lateral side of said lens frame so as to separate from said connector by a substantially right angle around said optical axis; a second detection member confronting said first detection member and disposed in the direction of said optical axis, one of said first and second detection members detecting the other thereof; a lens-position controller for obtaining positional information of said lens on the basis of a detection signal outputted by detecting one of said first and second detection members with the other thereof; and an original-position detector for judging whether or not said positional information of said lens corresponds to a preset original position of said lens, said original-position detector judging said positional information before said lens frame is moved to a target position,