JPS5785011A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS5785011A
JPS5785011A JP16158680A JP16158680A JPS5785011A JP S5785011 A JPS5785011 A JP S5785011A JP 16158680 A JP16158680 A JP 16158680A JP 16158680 A JP16158680 A JP 16158680A JP S5785011 A JPS5785011 A JP S5785011A
Authority
JP
Japan
Prior art keywords
attains
capacitor
executed
level
output
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
JP16158680A
Other languages
Japanese (ja)
Inventor
Takaichi Maruyama
Katsuji Maruyama
Kenji Komatsu
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.)
Kodak Digital Product Center Japan Ltd
Chinon KK
Original Assignee
Kodak Digital Product Center Japan Ltd
Chinon 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 Kodak Digital Product Center Japan Ltd, Chinon KK filed Critical Kodak Digital Product Center Japan Ltd
Priority to JP16158680A priority Critical patent/JPS5785011A/en
Publication of JPS5785011A publication Critical patent/JPS5785011A/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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To reduce wasteful power consumption, by constituting a device so as to disconnect an unnecessary electric power for a prescribed time after focusing is executed. CONSTITUTION:When a photographing lens 10 is driven by a motor M and the focusing is executed, a display element LED by a signal generated from a comparing and deciding circuit 12, also a transistor TR is turned off, and charging a capacitor C is started. An output of an operational amplifier OP maintains an L level until terminal voltage of the capacitor C attains to a prescribed value, an output terminal Q of a D-FF 18 also attains to L level, AND gates AND1- AND3 is reduced to nonconducting state, and the conduction to the motor M and an infrared light emission diode IR is cut off. When a prescribed time has elapsed, charging the capacitor C is completed, the output of the operational amplifier OP is returned to H level, the AND gates AND1-AND3 attains a conducting state again, and the operation is executed as an AF device. In this way, wasteful power consumption is reduced.
JP16158680A 1980-11-17 1980-11-17 Automatic focusing device Pending JPS5785011A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16158680A JPS5785011A (en) 1980-11-17 1980-11-17 Automatic focusing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16158680A JPS5785011A (en) 1980-11-17 1980-11-17 Automatic focusing device

Publications (1)

Publication Number Publication Date
JPS5785011A true JPS5785011A (en) 1982-05-27

Family

ID=15737937

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16158680A Pending JPS5785011A (en) 1980-11-17 1980-11-17 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS5785011A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
US7167203B1 (en) * 1998-07-30 2007-01-23 Minolta, Co., Ltd. Digital camera having controller for reducing occurrences of blur in displayed images

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593406A (en) * 1982-06-29 1984-01-10 Olympus Optical Co Ltd Detector for focusing state
JPH0254523B2 (en) * 1982-06-29 1990-11-21 Olympus Optical Co
US7167203B1 (en) * 1998-07-30 2007-01-23 Minolta, Co., Ltd. Digital camera having controller for reducing occurrences of blur in displayed images

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