JPS55110228A - Focus detector of camera - Google Patents

Focus detector of camera

Info

Publication number
JPS55110228A
JPS55110228A JP1694879A JP1694879A JPS55110228A JP S55110228 A JPS55110228 A JP S55110228A JP 1694879 A JP1694879 A JP 1694879A JP 1694879 A JP1694879 A JP 1694879A JP S55110228 A JPS55110228 A JP S55110228A
Authority
JP
Japan
Prior art keywords
sensor
enters
contrast
output
camera
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
JP1694879A
Other languages
Japanese (ja)
Inventor
Yoriyuki Uno
Masao Sadanao
Harumi Aoki
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Priority to JP1694879A priority Critical patent/JPS55110228A/en
Priority to US06/117,589 priority patent/US4352545A/en
Priority to DE19803005044 priority patent/DE3005044C2/en
Priority to FR8003066A priority patent/FR2449293A1/en
Priority to GB8004788A priority patent/GB2047037B/en
Publication of JPS55110228A publication Critical patent/JPS55110228A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To obtain the device which detect focus matching state by disposing two arrays of sensors on the two planes parallel to the film plane of the camera and comparing the contrast outputs obtainable therefrom.
CONSTITUTION: The luminous flux from the subject entering from a photographing lens 2 is bisected by a half mirror 6. The one goes upward and is observed by the eye 12 and the other is reflected downward by a mirror 7 and enters the inside of the optical constitution consisting of glass blocks 13, 14, 15. The entered luminous flux is bisected by a half mirror 16 and one thereof advances straightforward and enters a sensor 3. The other is reflected and enters a sensor 5. The sensors 3, 5 are so set that the film equivalent plane becomes the intermediate of these. Here, the output deducating the contrast output by the sensor 3 from the contrast output by the sensor 5 may be detected as rear defocus when it is (+), fornt defocus when (-) and focus matching when 0.
COPYRIGHT: (C)1980,JPO&Japio
JP1694879A 1979-02-13 1979-02-16 Focus detector of camera Pending JPS55110228A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP1694879A JPS55110228A (en) 1979-02-16 1979-02-16 Focus detector of camera
US06/117,589 US4352545A (en) 1979-02-13 1980-02-01 Camera focus detecting device
DE19803005044 DE3005044C2 (en) 1979-02-13 1980-02-11 Focus detection device for a camera
FR8003066A FR2449293A1 (en) 1979-02-13 1980-02-12 DEVICE FOR DETECTING THE FOCUSING OF A CAMERA
GB8004788A GB2047037B (en) 1979-02-13 1980-02-13 Focus detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1694879A JPS55110228A (en) 1979-02-16 1979-02-16 Focus detector of camera

Publications (1)

Publication Number Publication Date
JPS55110228A true JPS55110228A (en) 1980-08-25

Family

ID=11930344

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1694879A Pending JPS55110228A (en) 1979-02-13 1979-02-16 Focus detector of camera

Country Status (1)

Country Link
JP (1) JPS55110228A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5897011A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focusing detecting method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245353A (en) * 1975-10-08 1977-04-09 Hitachi Ltd Automatically focusing device
JPS5315131A (en) * 1976-07-27 1978-02-10 Canon Inc Detecting method for sharpness of objective image
JPS5350851A (en) * 1976-10-20 1978-05-09 Hitachi Ltd Automatic focus control apparatus of microscope
JPS53141030A (en) * 1977-05-14 1978-12-08 Ricoh Co Ltd Camera provided with focused point detector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5245353A (en) * 1975-10-08 1977-04-09 Hitachi Ltd Automatically focusing device
JPS5315131A (en) * 1976-07-27 1978-02-10 Canon Inc Detecting method for sharpness of objective image
JPS5350851A (en) * 1976-10-20 1978-05-09 Hitachi Ltd Automatic focus control apparatus of microscope
JPS53141030A (en) * 1977-05-14 1978-12-08 Ricoh Co Ltd Camera provided with focused point detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5897011A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focusing detecting method

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