公开(公告)号：US4991942A

公开(公告)日：1991-02-12

申请号：US514726

申请日：1990-04-26

申请人： Kazuo Fujibayashi ,  Makoto Sekita

发明人： Kazuo Fujibayashi ,  Makoto Sekita

IPC分类号： G02B15/173

CPC分类号： G02B15/173

摘要： A zoom lens comprising, from front to rear, a first lens group of positive power, a second lens group of negative power, and a third lens group of positive power, wherein the second and third lens groups are axially moved in differential relation to effect zooming, and the following conditions are satisfied:______________________________________ 0.9

摘要翻译： 一种变焦透镜，包括从前到后的正功率的第一透镜组，负功率的第二透镜组和正光焦度的第三透镜组，其中第二透镜组和第三透镜组以不同的方式轴向移动以产生效果 并且满足以下条件：-0.9 <|β2T| <1.1，β2T <0 -0.5 <|β3T| <1β3T <0 -0.4

公开(公告)号：US4912500A

公开(公告)日：1990-03-27

申请号：US296877

申请日：1989-01-12

申请人： Hideo Yokota ,  Masatake Kato ,  Akihiko Shiraishi ,  Makoto Sekita

发明人： Hideo Yokota ,  Masatake Kato ,  Akihiko Shiraishi ,  Makoto Sekita

IPC分类号： G03B7/099 ,  G03B19/12

CPC分类号： G03B19/12 ,  G03B7/09972

摘要： For a single lens reflex camera in which an image bearing beam from the photographic objective is reflected by a movable mirror to the finder system, techniques are disclosed that the mirror is made half-reflective, and the transmitted light of the mirror is conducted by a supplementary optical member consisting of, at least, a prism fixedly secured (not movable relative) to the mirror toward an image sensor such as that of a focus detector positioned outside the optical axes of the objective and finder, that the movable mirror is made to take a quite different direction of movement from that to which the reflected beam from the mirror goes, and that as an image pickup device such as CCD is arranged on the optical axis of the objective and behind the movable mirror, the optical characteristics of optical members such as a filter positioned in front of the image pickup device are made equivalent to those of the supplementary optical member.

摘要翻译： 对于单镜头反光照相机，其中来自照相物镜的图像轴承光束被可移动镜反射到取景器系统，公开了镜子制成半反射的技术，并且镜子的透射光通过 补充光学构件，至少由与位于物镜和取景器的光轴外侧的聚焦检测器的图像传感器固定地固定（不可相对移动）的棱镜，使可动镜被制成 与来自反射镜的反射光束相反的移动方向相当不同，并且作为诸如CCD的图像拾取装置被布置在物镜的光轴上并在可移动反射镜的后面，光学部件的光学特性 例如位于图像拾取装置前面的过滤器被制成与辅助光学部件相同的过滤器。