JPS5552031A - Focusing detector for single-lens reflex camera - Google Patents

Focusing detector for single-lens reflex camera

Info

Publication number
JPS5552031A
JPS5552031A JP12483078A JP12483078A JPS5552031A JP S5552031 A JPS5552031 A JP S5552031A JP 12483078 A JP12483078 A JP 12483078A JP 12483078 A JP12483078 A JP 12483078A JP S5552031 A JPS5552031 A JP S5552031A
Authority
JP
Japan
Prior art keywords
distance
mirror
measuring
luminous flux
light
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
JP12483078A
Other languages
Japanese (ja)
Inventor
Kiichi Kato
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 JP12483078A priority Critical patent/JPS5552031A/en
Publication of JPS5552031A publication Critical patent/JPS5552031A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable stable focusing detection to be performed without increasing the size of the camera body by forming a reflecting mirror surface to a quick return mirror, leading part of the photographing luminous flux to the inside of the quick return mirror and using the same as a distance-measuring luminous flux.
CONSTITUTION: A light transmission portion 7 constituted by a half mirror is formed in the central part of a quick return mirror 2 and the light transmitted through here is passed as a distance-measuring luminous flux through the inside of the mirror 2 and is then led to a distance-measuring photo detector 10 via reflecting mirror 9. The positions of the film plane 6 and distance-measuring photo detector 10 are made equivalent with respect to the photographing lens 1 to eliminate mutual optical path differences and a light absorbing body 11 is provided to the mirror 2 to so constitute the device that only the direct transmission light having no reflected light enters the distance-measuring photo detector 10 as a distance- measuring luminous flux. Thus, the focusing detection may be performed without noise and at high accuracy.
COPYRIGHT: (C)1980,JPO&Japio
JP12483078A 1978-10-11 1978-10-11 Focusing detector for single-lens reflex camera Pending JPS5552031A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12483078A JPS5552031A (en) 1978-10-11 1978-10-11 Focusing detector for single-lens reflex camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12483078A JPS5552031A (en) 1978-10-11 1978-10-11 Focusing detector for single-lens reflex camera

Publications (1)

Publication Number Publication Date
JPS5552031A true JPS5552031A (en) 1980-04-16

Family

ID=14895144

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12483078A Pending JPS5552031A (en) 1978-10-11 1978-10-11 Focusing detector for single-lens reflex camera

Country Status (1)

Country Link
JP (1) JPS5552031A (en)

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