JPS58118415U

JPS58118415U - Optical path splitting member

Info

Publication number: JPS58118415U
Application number: JP1433382U
Authority: JP
Inventors: 望北岸; 進松村
Original assignee: キヤノン株式会社
Priority date: 1982-02-04
Filing date: 1982-02-04
Publication date: 1983-08-12

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第・・１図、第７図は合焦検出光学系の原理的説明図、
第２菌、第３図は従来の光路分割部材の構成図、第４図
は受光素子に分割光が斜めに入射した場合の説明図、第
５図、第６図、第８図は本考案に係る光路分割部材の実
施例の構成図、第９図はカメラ内に実装する場合の光路
分割部材と受光素子との構成図である。　　。符号２．　３．　４．　３１は受光素子、９はセンサ基
板、２０は光路分割部材、２１は入射面、２２゜２４．
３２は半透過性の反射面、２３は全反射面、２５．２６
．２７は光学的部材、２８．２８’は射出面である。第３図　　　　　　　− ＠５１１　　　　、シ、第４図／一１′、第６図Figures 1 and 7 are principle explanatory diagrams of the focus detection optical system,
Fig. 3 is a configuration diagram of a conventional optical path splitting member, Fig. 4 is an explanatory diagram when divided light is incident obliquely on a light receiving element, and Figs. 5, 6, and 8 are a diagram of the present invention. FIG. 9 is a configuration diagram of an optical path dividing member and a light receiving element when mounted in a camera. . Code 2. 3. 4. 31 is a light receiving element, 9 is a sensor substrate, 20 is an optical path splitting member, 21 is an incident surface, 22°24.
32 is a semi-transparent reflective surface, 23 is a total reflective surface, 25.26
．． 27 is an optical member, and 28.28' is an exit surface. Figure 3 - @511, Figure 4/11', Figure 6

Claims

[Claims for Utility Model Registration] 1. In an optical path dividing member that divides a luminous flux into three or more parts,
The incident luminous flux and the divided output luminous flux are made to enter and exit approximately perpendicularly to the incident surface and the exit surface, respectively, and
It has a total reflection surface placed at an angle with respect to the incident light flux, and a semi-transparent reflection surface placed parallel to the total reflection surface, and the semi-transmission reflection surface adjusts the amount of light incident on each light receiving element. An optical path splitting member characterized in that the transmittance increases as the number of reflections increases so that the transmittance becomes substantially equal. 2. When dividing the luminous flux into n parts (n≧3), the transmittance of the portion of the semi-transparent reflective surface that passes the luminous flux incident on the first light receiving element counting from the incident side is 1/ ( A split member with an optical path according to claim 1 of the utility model registration claim.