JPS59102202A - Optical path branching prism of lens system - Google Patents

Optical path branching prism of lens system

Info

Publication number
JPS59102202A
JPS59102202A JP21360482A JP21360482A JPS59102202A JP S59102202 A JPS59102202 A JP S59102202A JP 21360482 A JP21360482 A JP 21360482A JP 21360482 A JP21360482 A JP 21360482A JP S59102202 A JPS59102202 A JP S59102202A
Authority
JP
Japan
Prior art keywords
prism
lens
spherical
optical path
harmful
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP21360482A
Other languages
Japanese (ja)
Inventor
Hiroshi Mito
Original Assignee
Hiroshi Mito
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hiroshi Mito filed Critical Hiroshi Mito
Priority to JP21360482A priority Critical patent/JPS59102202A/en
Publication of JPS59102202A publication Critical patent/JPS59102202A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/04Prisms

Abstract

PURPOSE:To shorten the length of a lens system, and also to prevent the reflection of a harmful light by the front face of a prism by forming the surface of an optical path of a branching optical path element coupled with the prism into a spherical surface, or joining a lens to the prism. CONSTITUTION:One lens having a half mirror part 6, which is formed by joining a prism 15 having a necessary spherical surface 13 and a prism 16 having a spherical surface 14 is placed on the same optical axis, succeeding lens systems 1, 2. A beam 4' which is made incident as slightly inclined from an optical axis 4 is reflected by the mirror part 6, but since the front face of the prism 15 forms a spherical surface, a direction of a reflected light becomes different from the direction of a branching luminous flux 7, and it does not become a harmful light. Also, even in case when lenses 23, 24 are joined to prisms 25, 26 instead of forming the spherical surface, the same operation is executed. Accordingly, the overall length of the lens system is shortened, and also a harmful reflected light can be prevented.
JP21360482A 1982-12-06 1982-12-06 Optical path branching prism of lens system Pending JPS59102202A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21360482A JPS59102202A (en) 1982-12-06 1982-12-06 Optical path branching prism of lens system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21360482A JPS59102202A (en) 1982-12-06 1982-12-06 Optical path branching prism of lens system

Publications (1)

Publication Number Publication Date
JPS59102202A true JPS59102202A (en) 1984-06-13

Family

ID=16641929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21360482A Pending JPS59102202A (en) 1982-12-06 1982-12-06 Optical path branching prism of lens system

Country Status (1)

Country Link
JP (1) JPS59102202A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293535A (en) * 1991-11-29 1994-03-08 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting device
US5327191A (en) * 1987-06-11 1994-07-05 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5428413A (en) * 1989-11-28 1995-06-27 Asaki Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5541701A (en) * 1992-01-13 1996-07-30 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus of camera view finder
US5557364A (en) * 1987-12-17 1996-09-17 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5583606A (en) * 1987-06-11 1996-12-10 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
EP0913716A2 (en) * 1997-10-28 1999-05-06 Oki Electric Industry Co., Ltd. Reflector type prism and reflector type prism forming die

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5327191A (en) * 1987-06-11 1994-07-05 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5583606A (en) * 1987-06-11 1996-12-10 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5557364A (en) * 1987-12-17 1996-09-17 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5428413A (en) * 1989-11-28 1995-06-27 Asaki Kogyo Kabushiki Kaisha Eye direction detecting apparatus
US5293535A (en) * 1991-11-29 1994-03-08 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting device
US5541701A (en) * 1992-01-13 1996-07-30 Asahi Kogaku Kogyo Kabushiki Kaisha Eye direction detecting apparatus of camera view finder
EP0913716A2 (en) * 1997-10-28 1999-05-06 Oki Electric Industry Co., Ltd. Reflector type prism and reflector type prism forming die
EP0913716A3 (en) * 1997-10-28 2000-09-20 Oki Electric Industry Co., Ltd. Reflector type prism and reflector type prism forming die
US6226135B1 (en) 1997-10-28 2001-05-01 Oki Electric Industry Co., Ltd. Reflector type prism and reflector type prism forming die

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