发明授权
- 专利标题: Photographic apparatus with lens focusing scale
- 专利标题(中): 具有镜头聚焦尺的摄影设备
-
申请号: US662352申请日: 1976-03-01
-
公开(公告)号: US4060817A公开(公告)日: 1977-11-29
- 发明人: Leonard J. Dionne
- 申请人: Leonard J. Dionne
- 申请人地址: MA Cambridge
- 专利权人: Polaroid Corporation
- 当前专利权人: Polaroid Corporation
- 当前专利权人地址: MA Cambridge
- 主分类号: G03B3/02
- IPC分类号: G03B3/02 ; G03B13/04 ; G03B3/00 ; G03B13/02
摘要:
Photographic apparatus including an indicating device bearing indicia for relating to the operator a distance at which a variable focusing lens assembly of the apparatus is focused. The indicating device is coupled to a focusing control system of the apparatus for movement therewith as the lens assembly is moved between distant and nearmost foci to bring the camera into coincidence with a predetermined estimation of a camera-to-subject distance for a photographic scene.In a preferred embodiment, an image of the indicia is presented in or beneath a field of view of a viewfinder mounted upon the apparatus and serves as a reminder to the operator of the distance at which the lens assembly is focused whereby an error in the focused position of the lens assembly is made obvious to the operator and a proper correction can be made before the shutter of the apparatus is released.
公开/授权文献
- US5760959A Interferential position measuring device with three detectors 公开/授权日:1998-06-02
信息查询