JPS56128924A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS56128924A
JPS56128924A JP3305080A JP3305080A JPS56128924A JP S56128924 A JPS56128924 A JP S56128924A JP 3305080 A JP3305080 A JP 3305080A JP 3305080 A JP3305080 A JP 3305080A JP S56128924 A JPS56128924 A JP S56128924A
Authority
JP
Japan
Prior art keywords
mirror
focus
pentagonal prism
totally
reflective mirror
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
JP3305080A
Other languages
Japanese (ja)
Inventor
Yoshiharu Takahashi
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta 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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP3305080A priority Critical patent/JPS56128924A/en
Publication of JPS56128924A publication Critical patent/JPS56128924A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Abstract

PURPOSE:To maintain the high precision of focus detection stably, by providing an optical member, having a half-mirror and totally reflex mirror, over the incident surface of a pentagonal prism. CONSTITUTION:In the focus detector of a single-lens reflex camera, a condenser lens or plane glass 15 having half-mirror 13 and a totally reflective mirror (plane or spherical surface) is bonded to the incident surface of pentagonal prism 16. Light passed through photographic lens L forms an image on focus-point plate 12 via movable reflective mirror 11. The light is passed through half-mirror 13 and totally reflective mirror 14 and then led to focus detecting photodetector 17 via pentagonal prism 16. Thus, the high precision of focus detection can stably be maintained.
JP3305080A 1980-03-14 1980-03-14 Focus detector Pending JPS56128924A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3305080A JPS56128924A (en) 1980-03-14 1980-03-14 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3305080A JPS56128924A (en) 1980-03-14 1980-03-14 Focus detector

Publications (1)

Publication Number Publication Date
JPS56128924A true JPS56128924A (en) 1981-10-08

Family

ID=12375936

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3305080A Pending JPS56128924A (en) 1980-03-14 1980-03-14 Focus detector

Country Status (1)

Country Link
JP (1) JPS56128924A (en)

Similar Documents

Publication Publication Date Title
US4907026A (en) Light projection system for automatic focus detection
JPS56128924A (en) Focus detector
JPS55111928A (en) Automatic focusing device
JPS57168235A (en) Photometric optical system of single-lens reflex camera
JPS5754931A (en) View finder for single-lens reflex camera
JPS5588041A (en) Finder of single-lens reflex camera
JPS54107337A (en) Focusing device of single-lens reflex camera
JPS55105239A (en) Finder of single-lens reflex camera
JPS56165126A (en) Device for focusing
JPS56109321A (en) Single-lens reflex camera system providing ttl photometry
JPS5471652A (en) Automatic dimmer for microscope light source
JPS56106226A (en) Focusing detector of single lens reflex camera
JPS54107338A (en) Focusing device of single-lens reflex camera
JPS6466628A (en) Camera
JPS5734535A (en) Photometric method in camera
JPS56146109A (en) Photometric device
JPS5492321A (en) Optical system for focus detecting of single-lens reflex camera
JPS5774719A (en) Finder device of single-lens reflex camera
JPS57148710A (en) Focus detector
RU1778742C (en) Light-measuring device for reflex camera
JPS55108629A (en) Focus detector of camera
JPS56130725A (en) Optical device for focus detection
JPS57177134A (en) Indicator placed in finder
JPS56128923A (en) Focus detector
JPS552232A (en) Focusing optical device for camera