JPS5694334A - Automatic focusing camera - Google Patents

Automatic focusing camera

Info

Publication number
JPS5694334A
JPS5694334A JP17382579A JP17382579A JPS5694334A JP S5694334 A JPS5694334 A JP S5694334A JP 17382579 A JP17382579 A JP 17382579A JP 17382579 A JP17382579 A JP 17382579A JP S5694334 A JPS5694334 A JP S5694334A
Authority
JP
Japan
Prior art keywords
motor
outputs
run
focusing
comparators
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.)
Granted
Application number
JP17382579A
Other languages
Japanese (ja)
Other versions
JPH0226207B2 (en
Inventor
Shigeo Enomoto
Mitsuhiko Shimoda
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 JP17382579A priority Critical patent/JPS5694334A/en
Priority to DE19803049233 priority patent/DE3049233C2/en
Priority to GB8041420A priority patent/GB2069286B/en
Publication of JPS5694334A publication Critical patent/JPS5694334A/en
Publication of JPH0226207B2 publication Critical patent/JPH0226207B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE: To make construction simple by running a focusing motor at a high speed when a photographic lens is away from the focusing position and at a low speed when it is near the same, and running the motor reversely via switches in infinite and shortest distance photographing positions.
CONSTITUTION: The outputs of two photoelectric elements 9, 10 which are provided in equivalent positions on the film plane by leaving a micro distance are passed through a differential amplifier and are compared with threshold values Vr+, Vr- in comparators 16, 17. Depending upon which output is L, the moving direction of a photographic lens is judged. The outputs thereof run a motor 31 via gates 21, 22, FF 23, gates 28, 29 and an amplifier 30. The outputs of the photoelectric elements 9, 10 are compared with Vr+ in comparators 18, 19, and run the motor 31 slowly near the focusing region and fast away from there via a gate 20 then through an oscillating circuit 32, and a gate 27. In infinite and shortest photographing positions, switches 24, 25 go on to run the motor 31 reversely. Hence, the construction is made simple.
COPYRIGHT: (C)1981,JPO&Japio
JP17382579A 1979-12-27 1979-12-27 Automatic focusing camera Granted JPS5694334A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP17382579A JPS5694334A (en) 1979-12-27 1979-12-27 Automatic focusing camera
DE19803049233 DE3049233C2 (en) 1979-12-27 1980-12-27 Photographic camera with automatic focus
GB8041420A GB2069286B (en) 1979-12-27 1980-12-29 Photographic camera of automatic focussing type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17382579A JPS5694334A (en) 1979-12-27 1979-12-27 Automatic focusing camera

Publications (2)

Publication Number Publication Date
JPS5694334A true JPS5694334A (en) 1981-07-30
JPH0226207B2 JPH0226207B2 (en) 1990-06-08

Family

ID=15967845

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17382579A Granted JPS5694334A (en) 1979-12-27 1979-12-27 Automatic focusing camera

Country Status (2)

Country Link
JP (1) JPS5694334A (en)
GB (1) GB2069286B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779922A (en) * 1980-11-07 1982-05-19 Nippon Kogaku Kk <Nikon> Automatic focusing camera
JPS58214130A (en) * 1982-06-04 1983-12-13 West Electric Co Ltd Automatic focus controller
JPS599610A (en) * 1982-07-09 1984-01-19 Hitachi Denshi Ltd Automatic focusing device
JPS5924811A (en) * 1982-08-02 1984-02-08 Hitachi Denshi Ltd Automatic focusing device
JPS5961823A (en) * 1982-10-01 1984-04-09 Matsushita Electric Ind Co Ltd Lens driving device
JPS62226114A (en) * 1986-03-27 1987-10-05 Nikon Corp Automatic focusing device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2598218A1 (en) * 1986-04-30 1987-11-06 Commissariat Energie Atomique CONTACTLESS LINEAR MEASURING SENSOR OF THE DISTANCE OF A TARGET BY RETROFUL RADIATION
DE4004530C2 (en) * 1990-02-14 1999-07-29 Stefan Reich Optical distance measurement
EP1380811B2 (en) 2002-07-03 2013-08-07 Optosys SA Optical distance measuring device
CN109491091B (en) * 2019-01-10 2024-04-16 京东方科技集团股份有限公司 Optical system applied to VRAR system and focusing method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495623A (en) * 1972-05-06 1974-01-18
JPS49114422A (en) * 1973-02-28 1974-10-31
JPS544121A (en) * 1977-06-06 1979-01-12 Honeywell Inc Automatic focus device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS495623A (en) * 1972-05-06 1974-01-18
JPS49114422A (en) * 1973-02-28 1974-10-31
JPS544121A (en) * 1977-06-06 1979-01-12 Honeywell Inc Automatic focus device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5779922A (en) * 1980-11-07 1982-05-19 Nippon Kogaku Kk <Nikon> Automatic focusing camera
JPS6356961B2 (en) * 1980-11-07 1988-11-09 Nippon Kogaku Kk
JPS58214130A (en) * 1982-06-04 1983-12-13 West Electric Co Ltd Automatic focus controller
JPS599610A (en) * 1982-07-09 1984-01-19 Hitachi Denshi Ltd Automatic focusing device
JPS5924811A (en) * 1982-08-02 1984-02-08 Hitachi Denshi Ltd Automatic focusing device
JPS5961823A (en) * 1982-10-01 1984-04-09 Matsushita Electric Ind Co Ltd Lens driving device
JPS62226114A (en) * 1986-03-27 1987-10-05 Nikon Corp Automatic focusing device

Also Published As

Publication number Publication date
GB2069286B (en) 1984-02-29
GB2069286A (en) 1981-08-19
JPH0226207B2 (en) 1990-06-08

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