公开(公告)号：US5483381A

公开(公告)日：1996-01-09

申请号：US186599

申请日：1994-01-26

申请人： Toshiro Baba

发明人： Toshiro Baba

IPC分类号： G02B13/18 ,  G02B23/14 ,  G02B25/00 ,  G03B13/06 ,  G02B3/02 ,  G02B13/00

CPC分类号： G02B13/18 ,  G02B23/14

摘要： A reversed Galilean finder optical system includes the first lens unit with a negative refracting power and the second lens unit with a positive refracting power. The second lens unit consists of a single positive lens in which the refracting power of the surface on the pupil side is higher than that of the surface on the object side. At least one surface of the positive lens is aspherical. Thus, the reversed Galilean finder optical system is constructed as the finder which has compact design and good performance.

摘要翻译： 反向的伽利略取景器光学系统包括具有负折射力的第一透镜单元和具有正折射力的第二透镜单元。 第二透镜单元由单个正透镜组成，其中光瞳面上的表面的折射能力高于物体侧表面的折射能力。 正透镜的至少一个表面是非球面的。 因此，反向伽利略取景器光学系统被构造为具有紧凑设计和良好性能的取景器。

公开(公告)号：US5546236A

公开(公告)日：1996-08-13

申请号：US208836

申请日：1994-03-11

申请人： Yasuji Ogata ,  Toshiro Baba

发明人： Yasuji Ogata ,  Toshiro Baba

IPC分类号： G02B13/06 ,  G02B15/02

CPC分类号： G02B13/06

摘要： A wide-angle photographic lens system comprising a front lens unit having a positive refractive power, an aperture stop and a rear lens unit having a positive refractive power or a negative refractive power; the front lens unit comprising at least one positive lens component and at least one negative lens component, whereas said rear lens unit consisting of a positive lens component having a convex surface on the image side. This photographic lens system has a short total length (a length as measured from a first surface to an image side surface of the lens system and a small value of .SIGMA.d (a distance as measured from the first surface to a final surface thereof), and is suited for use with collapsible mount type cameras.

摘要翻译： 一种广角摄影镜头系统，包括具有正折光力的前透镜单元，孔径光阑和具有正折射光焦度或负折射光焦度的后透镜单元; 前透镜单元包括至少一个正透镜部件和至少一个负透镜部件，而所述后透镜单元由在像侧上具有凸面的正透镜部件组成。 该摄影透镜系统具有短的总长度（从透镜系统的第一表面到像侧表面测量的长度以及SIGMA d的小值（从第一表面到其最终表面测量的距离）， 并且适用于可折叠式安装型摄像机。