发明授权
US4472039A Photographic lens device having a step motor mounted on the lens barrel
失效
具有安装在镜筒上的步进电机的摄影镜头装置
- 专利标题: Photographic lens device having a step motor mounted on the lens barrel
- 专利标题(中): 具有安装在镜筒上的步进电机的摄影镜头装置
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申请号: US400680申请日: 1982-07-22
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公开(公告)号: US4472039A公开(公告)日: 1984-09-18
- 发明人: Hiroshi Iwata , Toshitsugu Kashihara , Tsunemi Yoshino , Akitoshi Morioka
- 申请人: Hiroshi Iwata , Toshitsugu Kashihara , Tsunemi Yoshino , Akitoshi Morioka
- 申请人地址: JPX Osaka
- 专利权人: West Electric Co., Ltd.
- 当前专利权人: West Electric Co., Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX56-115734 19810723
- 主分类号: G03B7/095
- IPC分类号: G03B7/095 ; G03B7/10 ; G03B9/02 ; G03B9/07 ; G03B9/06
摘要:
A photographic lens device with a built-in electronic aperture-stop control system or mechanism comprising a step motor and an aperture-stop setting device which are spaced apart from each other by a suitable distance in the direction of the optical axis of the photographic lens system and are coupled to each other through a coupling means. In one embodiment, the aperture-stop control system can be incorporated in the lens device simply by slightly enlarging the diameter of the lens device or barrel without increasing its axial length because of full possible use of a heretofore unused dead space available in the lens device.