JPS5552029A - Focusing optical device for single-lens reflex camera - Google Patents

Focusing optical device for single-lens reflex camera

Info

Publication number
JPS5552029A
JPS5552029A JP12450178A JP12450178A JPS5552029A JP S5552029 A JPS5552029 A JP S5552029A JP 12450178 A JP12450178 A JP 12450178A JP 12450178 A JP12450178 A JP 12450178A JP S5552029 A JPS5552029 A JP S5552029A
Authority
JP
Japan
Prior art keywords
mirror
quick return
reflected
return mirror
photographing
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
JP12450178A
Other languages
Japanese (ja)
Inventor
Kiyoshi Fujii
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP12450178A priority Critical patent/JPS5552029A/en
Publication of JPS5552029A publication Critical patent/JPS5552029A/en
Pending legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To prevent the entry of undesired external light by disposing a micro- mirror between the photographing lens and quick return mirror and leading the light reflected by the micro-mirror to a distance measuring photo detector after letting the same be reflected by the quick return mirror.
CONSTITUTION: The photographing luminous flux from a photographing lens 21 is reflected by a quick return mirror 22 of total reflection surface and is led to the finder optical system. Part of this photographing luminous flux is reflected by the micro-mirror 25 disposed immediately before the quick return mirror and is further reflected at least once by the quick return mirror 22, after which it is led as a distance measuring luminous flux to a photo detector. Hence, there is no need for forming half-mirror portions to the quick return mirror 22 and mounting plate-form reflecting mirrors and the entry of undesired external light at the photographing may be effectively prevented.
COPYRIGHT: (C)1980,JPO&Japio
JP12450178A 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera Pending JPS5552029A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12450178A JPS5552029A (en) 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12450178A JPS5552029A (en) 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera

Publications (1)

Publication Number Publication Date
JPS5552029A true JPS5552029A (en) 1980-04-16

Family

ID=14887044

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12450178A Pending JPS5552029A (en) 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera

Country Status (1)

Country Link
JP (1) JPS5552029A (en)

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