| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens barrel that improves the efficiency of work in tracking adjustment. SOLUTION: A cam tube 32 includes a front cam tube 53, an intermediate cam tube 54 and a rear cam tube 55, which are connected with each other. The cam tubes 53-55 have at least one cam groove among the cam grooves 44-47 for moving first to fourth lens groups. The cam tubes 53-55 are joined by flanges 57, 62, 63, 65 that are secured together, which are arranged on a connected surface, using a screw 59. The intermediate cam tube 54 rotatably supports the front cam tube 53 by fitting an annular protrusion 61 arranged at a tip with an annular groove 58 arranged at the rear end of the front cam tube 53. The rear cam tube 55 rotatably supports the intermediate cam tube 54 by fitting an annular protrusion 68 arranged at the front edge with an annular groove 64 arranged at the rear end of the intermediate cam tube 54. Openings 60, 70 for passing the screw 59 are formed long circumferentially, thereby allowing the tracking adjustment by relatively shifting the position for attaching the cam tubes 53-55 circumferentially direction. COPYRIGHT: (C)2011,JPO&INPIT
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