公开(公告)号：US3900858A

公开(公告)日：1975-08-19

申请号：US42091373

申请日：1973-12-03

Applicant: POLAROID CORP

Inventor： MCCANN MARY CONLIN ,  PLUMMER WILLIAM T ,  WALWORTH VIVIAN K

IPC: G02B21/24 ,  G02B27/16 ,  G03B7/099 ,  G03B17/48

CPC classification number: G03B7/099 ,  G02B21/241 ,  G02B27/16

Abstract: The invention is an optical element, one version of which is useful for operating an automatic exposure control of a selfcontained camera coupled to a microscope without detracting from the brightness of the magnified image to be recorded on the camera''s film format. The article includes three reflecting surfaces arranged to extract a small part of the light emerging from the microscope''s eyepiece and direct it into the photodetector of the automatic exposure control. A lens refracts the light, after the third reflection, to improve the distribution of the light onto the camera''s photodetector. The article is suitable for manufacture as a homogeneous molding of transparent plastic.

Abstract translation: 本发明是一种光学元件，其一个版本可用于操作耦合到显微镜的独立照相机的自动曝光控制，而不会降低要记录在相机胶片格式上的放大图像的亮度。 该物品包括三个反射表面，其布置成从显微镜的目镜中提取出一小部分光并将其引导到自动曝光控制的光电检测器中。 透镜在第三次反射之后折射光，以改善光到相机的光电检测器上的分布。 该制品适用于制造透明塑料的均匀成型品。