Title: Lens tube
Application Number: 02141636 Application Date: 2002.09.06
Publication Number: 1407388 Publication Date: 2003.04.02
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G02B7/04;G02B7/10;G03B13/32
Applicant(s) Name: Olympus Optical Co., Ltd. Address:
Inventor(s) Name: Anfu Akatsuki
Attorney & Agent: huang jianfeng
Abstract:
    The present invention provides a lens barrel capable of accurately performing positioning between a 1st lens group frame and a 3rd lens group frame with simple constitution, the simplification of a manufacturing process and the reduction of manufacture cost. A rotating frame 3 is rotated by the rotational driving of a driving gear 100 in a fixed frame 2 in this lens barrel 1, the rotating frame 3 and a moving frame 4 are relatively extended and a cam frame 5 is also extended by the cam groove 4m of the moving frame 4. Then, the 1st to the 3rd lens group frames 6 to 9 are relatively extended according as the cam frame 5 is extended. In the case of zooming operation from a wide end position to a telephoto end position, a 1st group pin 13 for extending the 1st lens group frame 6 abuts on the positioning part 14b of a 1st group sliding groove 14a formed on the extended part 14 of the 3rd lens group frame 9 by the energizing force of a spring 8, whereby the 3rd lens group frame 9 is positioned at a specified interval with respect to the 1st lens group frame 6 and integrally extended in a state it keeps the specified interval.
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