Patent ID: 7551369
Filing Date: 2009-06-23
Classification: G02B

Abstract:
1. A lens barrel, comprising: a first movable lens unit; a first drive source for moving the first movable lens unit in a direction parallel to an optical axis; a second movable lens unit; a second drive source for moving the second movable lens unit in a direction parallel to the optical axis; guide members for each retaining the first and second movable lens units and for guiding movements of the first and second movable lens units; and a reference position detector for detecting reference positions for the first and second movable lens units, wherein the reference position detector has a light emitting element and a light receiving element, wherein the first and second movable lens units have sleeves each engaged with the guide members and have light blocking portions for detecting the reference positions by the light emitting element and the light receiving element of the reference position detector, and wherein the first and second lens units can move in the optical axis direction, with their respective light blocking portions passing each other without any interference.