JPS5552030A - Focusing optical device for single-lens reflex camera - Google Patents

Focusing optical device for single-lens reflex camera

Info

Publication number
JPS5552030A
JPS5552030A JP12450278A JP12450278A JPS5552030A JP S5552030 A JPS5552030 A JP S5552030A JP 12450278 A JP12450278 A JP 12450278A JP 12450278 A JP12450278 A JP 12450278A JP S5552030 A JPS5552030 A JP S5552030A
Authority
JP
Japan
Prior art keywords
lens
torus
photo detector
photographing lens
cooperation
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
JP12450278A
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 JP12450278A priority Critical patent/JPS5552030A/en
Publication of JPS5552030A publication Critical patent/JPS5552030A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To enable the setting position of a distance measuring photo detector to be selected as desired by the constitution comprising providing a torus-form lens moving in cooperation with the movement of the photographing lens to the outside circumference of the photographing lens and leading the light converged by this to the distance measuring photo detector.
CONSTITUTION: A photographing lens 1 and a torus-form lens 2 are provided to one lens-barrel and the torus-form lens 2 also moves in the optical axis direction in cooperation with the movement in the optical axis direction of the lens 1. On the other hand, a distance-measuring photo detector 4 which receives the light converted by the torus-form lens 2 is provided on the optical axis to a quick return mirror 3 and the light converged by the torus-form lens 2 moving in cooperation to the movement of the photographing lens 1 is imaged on the photo detector 4. The position where the contrast thereof becomes maximum is detected as the focus position of the photographing lens 1.
COPYRIGHT: (C)1980,JPO&Japio
JP12450278A 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera Pending JPS5552030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12450278A JPS5552030A (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
JP12450278A JPS5552030A (en) 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera

Publications (1)

Publication Number Publication Date
JPS5552030A true JPS5552030A (en) 1980-04-16

Family

ID=14887071

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12450278A Pending JPS5552030A (en) 1978-10-09 1978-10-09 Focusing optical device for single-lens reflex camera

Country Status (1)

Country Link
JP (1) JPS5552030A (en)

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