JPS5723910A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS5723910A
JPS5723910A JP9758480A JP9758480A JPS5723910A JP S5723910 A JPS5723910 A JP S5723910A JP 9758480 A JP9758480 A JP 9758480A JP 9758480 A JP9758480 A JP 9758480A JP S5723910 A JPS5723910 A JP S5723910A
Authority
JP
Japan
Prior art keywords
signal
gate
inputted
motor
signals
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
JP9758480A
Other languages
Japanese (ja)
Other versions
JPH0232605B2 (en
Inventor
Ryuzo Mototsugu
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.)
Nikon Corp
Nippon Chemical Industrial Co Ltd
Original Assignee
Nippon Chemical Industrial Co Ltd
Nippon Kogaku KK
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 Nippon Chemical Industrial Co Ltd, Nippon Kogaku KK filed Critical Nippon Chemical Industrial Co Ltd
Priority to JP9758480A priority Critical patent/JPS5723910A/en
Publication of JPS5723910A publication Critical patent/JPS5723910A/en
Publication of JPH0232605B2 publication Critical patent/JPH0232605B2/ja
Granted 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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)
  • Lens Barrels (AREA)

Abstract

PURPOSE:To speed the operation of a motor and to improve focusing precision by providing a means of varying the turning speed of the motor with the pulse width of a pulse signal and of prescribing the minimum limit of the pulse width. CONSTITUTION:Signals inputted from a focus detector to input terminals 1 and 2 are converted by comparators 3 and 4 into rectangular wave signals A and B. For example, the signal B leading the signal A in terms of phase. In this case, the signals A and B are inputted to an EX-OR gate 6, which supplies a phase difference signal C to an OR gate 10. The signals A and B are passed through an OR gate 7 to operate monostable multivibrators 8 and 9 by the signal B. The output E of the monostable multivibrator 8 is inputted to an OR gate 10, whose output signal H has pulse width greater than that of the signal C. The output signal F of the monostable multivibrator 9, on the other hand, serves as the clock signal of an FF11 to latch the signal C. The signal H and G are ANDed by an AND gate 12, whose output is inputted to an EX-OR gate 13, thereby controlling focusing by flowing a current IM, which depends upon a difference voltage K from a signal J from an FF5, to a motor M. Consequently, the speed of the motor is increased and focusing precision is improved.
JP9758480A 1980-07-18 1980-07-18 Automatic focusing device Granted JPS5723910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9758480A JPS5723910A (en) 1980-07-18 1980-07-18 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9758480A JPS5723910A (en) 1980-07-18 1980-07-18 Automatic focusing device

Publications (2)

Publication Number Publication Date
JPS5723910A true JPS5723910A (en) 1982-02-08
JPH0232605B2 JPH0232605B2 (en) 1990-07-23

Family

ID=14196281

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9758480A Granted JPS5723910A (en) 1980-07-18 1980-07-18 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS5723910A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949522A (en) * 1982-09-14 1984-03-22 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPS59159115A (en) * 1983-03-01 1984-09-08 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPS59224806A (en) * 1983-06-06 1984-12-17 Hitachi Denshi Ltd Focusing controller
JPH0772374A (en) * 1994-01-26 1995-03-17 Nikon Corp Position controller for photographing lens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990529A (en) * 1972-12-27 1974-08-29
JPS50158327A (en) * 1974-06-10 1975-12-22
JPS5484940U (en) * 1977-11-29 1979-06-15
JPS54119232A (en) * 1978-02-23 1979-09-17 Asahi Optical Co Ltd Automatic focusing controller

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4990529A (en) * 1972-12-27 1974-08-29
JPS50158327A (en) * 1974-06-10 1975-12-22
JPS5484940U (en) * 1977-11-29 1979-06-15
JPS54119232A (en) * 1978-02-23 1979-09-17 Asahi Optical Co Ltd Automatic focusing controller

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5949522A (en) * 1982-09-14 1984-03-22 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPH0474684B2 (en) * 1982-09-14 1992-11-26
JPS59159115A (en) * 1983-03-01 1984-09-08 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPS59224806A (en) * 1983-06-06 1984-12-17 Hitachi Denshi Ltd Focusing controller
JPH0772374A (en) * 1994-01-26 1995-03-17 Nikon Corp Position controller for photographing lens

Also Published As

Publication number Publication date
JPH0232605B2 (en) 1990-07-23

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