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JPS55105204A - Optical path branching filter - Google Patents

Optical path branching filter

Info

Publication number
JPS55105204A
JPS55105204A JP1299479A JP1299479A JPS55105204A JP S55105204 A JPS55105204 A JP S55105204A JP 1299479 A JP1299479 A JP 1299479A JP 1299479 A JP1299479 A JP 1299479A JP S55105204 A JPS55105204 A JP S55105204A
Authority
JP
Japan
Prior art keywords
luminous flux
reflected
mirror
optical path
branching filter
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
JP1299479A
Other languages
Japanese (ja)
Inventor
Nozomi Kitagishi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP1299479A priority Critical patent/JPS55105204A/en
Publication of JPS55105204A publication Critical patent/JPS55105204A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Elements Other Than Lenses (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To achieve the miniaturization of the optical path branching filter by installing the exit surface of the optical block from which the light reflected by a half mirror is emitted, in nearly parallel to the luminous flux reflected by a total reflecting mirror.
CONSTITUTION: The luminous flux A from a condenser lens is divided to the transmitted luminous flux B and reflected luminous flux by a half mirror 7. This reflected luminous flux is made to the luminous flux C by a total reflecting mirror 8 and is entered to a photometric element 10. Here, the surface 11a of an optical block 11 from which the luminous flux going toward the mirror 8 is installed nearly parallel to the luminous flux C. Then, the stray light D, which tries to enter the phtotmetric element directly without being reflected by the mirror 7, out of the light of the luminous flux A, enters the surface 11a by having a large angle θ and therefore it is totally reflected, thus the cutting off of the luminous flux C and stray light D is distinctly accomplished. This makes it possible to reduce the spacing of the luminous fluxes B, C and miniaturize the optical path branching filter.
COPYRIGHT: (C)1980,JPO&Japio
JP1299479A 1979-02-07 1979-02-07 Optical path branching filter Pending JPS55105204A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1299479A JPS55105204A (en) 1979-02-07 1979-02-07 Optical path branching filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1299479A JPS55105204A (en) 1979-02-07 1979-02-07 Optical path branching filter

Publications (1)

Publication Number Publication Date
JPS55105204A true JPS55105204A (en) 1980-08-12

Family

ID=11820750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1299479A Pending JPS55105204A (en) 1979-02-07 1979-02-07 Optical path branching filter

Country Status (1)

Country Link
JP (1) JPS55105204A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108629A (en) * 1979-02-13 1980-08-21 Asahi Optical Co Ltd Focus detector of camera
JPS55108630A (en) * 1979-02-13 1980-08-21 Asahi Optical Co Ltd Focus detector of camera
JPS5994720A (en) * 1982-11-22 1984-05-31 Olympus Optical Co Ltd Focusing detector
JPS622014U (en) * 1985-06-19 1987-01-08
FR3059156A1 (en) * 2016-11-22 2018-05-25 Sodern OPTICAL DETECTION MODULE

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55108629A (en) * 1979-02-13 1980-08-21 Asahi Optical Co Ltd Focus detector of camera
JPS55108630A (en) * 1979-02-13 1980-08-21 Asahi Optical Co Ltd Focus detector of camera
JPS5994720A (en) * 1982-11-22 1984-05-31 Olympus Optical Co Ltd Focusing detector
JPH0352608B2 (en) * 1982-11-22 1991-08-12 Olympus Optical Co
JPS622014U (en) * 1985-06-19 1987-01-08
FR3059156A1 (en) * 2016-11-22 2018-05-25 Sodern OPTICAL DETECTION MODULE

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