Patent ID: 7535655
Filing Date: 2009-05-19
Classification: G02B,H04N

Abstract:
1. A lens device provided on a lens barrel for a television camera, the lens device comprising: a master lens; a flange-back adjusting mechanism for moving the master lens forward/backward in an optical axis direction; a flange-back adjusting unit including the master lens and the flange-back adjusting mechanism, the flange-back adjusting unit being movable forward/backward in the optical axis direction; and a fixing member for fixing the flange-back adjusting unit on a predetermined position after the forward/backward movement, wherein the flange-back adjusting mechanism includes: a cylindrical cam having an inner surface on which a cam groove is formed, the cylindrical cam being rotated by driving force transmitted from a driving mechanism; a support ring rotatably supporting the cylindrical cam; and a lens frame having an engaging portion engaged with the cam groove, the lens frame holding the master lens being moved forward/backward in the optical axis direction by relatively moving the engaging portion along the cam groove by the rotation of the cylindrical cam.