发明名称 |
Eccentricity-prevention mechanism for a pair of lens-supporting rings |
摘要 |
An eccentricity-prevention mechanism includes a pair of lens-supporting rings for supporting a pair of lens groups, respectively; and a pair of positioning recesses and a follower projection formed on one and the other of opposed surfaces of the pair of lens-supporting rings, such that the follower projection engages with one of the pair of positioning recess to define a relative position of the pair of lens-supporting rings with respect to the optical axis, at a mutually close position and at a mutually distant position. At least three pairs of the positioning recesses and at least three follower projections are provided at different positions in a circumferential direction, so that eccentricity between the pair of lens-supporting rings is eliminated when all of the follower projections are concurrently brought into engagement with corresponding positioning recesses.
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申请公布号 |
US2002039241(A1) |
申请公布日期 |
2002.04.04 |
申请号 |
US20010960515 |
申请日期 |
2001.09.24 |
申请人 |
ASHAI KOGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
NOMURA HIROSHI;SASAKI TAKAMITSU;ISHIZUKA KAZUNORI;TAKASHIMA MAIKO |
分类号 |
G02B7/10;(IPC1-7):G02B7/02;G02B15/14;G02B15/22 |
主分类号 |
G02B7/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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