JPS5497055A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS5497055A
JPS5497055A JP401378A JP401378A JPS5497055A JP S5497055 A JPS5497055 A JP S5497055A JP 401378 A JP401378 A JP 401378A JP 401378 A JP401378 A JP 401378A JP S5497055 A JPS5497055 A JP S5497055A
Authority
JP
Japan
Prior art keywords
laser
output
lens
optical axis
focusing operation
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
JP401378A
Other languages
Japanese (ja)
Other versions
JPS6243254B2 (en
Inventor
Kazuo Okada
Mitsushige Kondo
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP401378A priority Critical patent/JPS5497055A/en
Priority to NL7812058A priority patent/NL186121C/en
Priority to DE7979900037T priority patent/DE2862256D1/en
Priority to PCT/JP1978/000052 priority patent/WO1979000400A1/en
Priority to EP79900037A priority patent/EP0007902B1/en
Publication of JPS5497055A publication Critical patent/JPS5497055A/en
Publication of JPS6243254B2 publication Critical patent/JPS6243254B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To make it possible to accomplish the stable automatic focusing operation, while facilitating the adjustment of an optical system, by using a semiconductor laser as a light source to vibrate the same in the direction of the optical axis.
CONSTITUTION: The laser beam 2 from a semiconductor laser is condensed upon the surface of a video disc 4 by the action of an objective lens 3. The reflected light is into a light emitting portion of the laser 14 so that the resultantly varied output of the laser 14 is subjected to signal processing at 16, after it is optically detected at 8, thereby to effect a video reproduction. In this instance, the oscillator 11 excites a vibrator 9 so that the laser 14 is vibrated with a preset frequency f in the optical axis direction. As a result, the frequency f is inverted in phase in the displacement of the surface of the disc 4 from the focal point of the lens 3, and the lens 3 is moved in the direction of arrow A through an actuator 13 by the output which is produced by effecting the phase detection of the output of the detector 8 so that the focusing operation can be automatically.
COPYRIGHT: (C)1979,JPO&Japio
JP401378A 1977-12-16 1978-01-17 Automatic focusing device Granted JPS5497055A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP401378A JPS5497055A (en) 1978-01-17 1978-01-17 Automatic focusing device
NL7812058A NL186121C (en) 1977-12-16 1978-12-12 AUTOMATIC FOCUSING DEVICE.
DE7979900037T DE2862256D1 (en) 1977-12-16 1978-12-13 Automatic focusing system
PCT/JP1978/000052 WO1979000400A1 (en) 1977-12-16 1978-12-13 Automatic focusing system
EP79900037A EP0007902B1 (en) 1977-12-16 1979-07-16 Automatic focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP401378A JPS5497055A (en) 1978-01-17 1978-01-17 Automatic focusing device

Publications (2)

Publication Number Publication Date
JPS5497055A true JPS5497055A (en) 1979-07-31
JPS6243254B2 JPS6243254B2 (en) 1987-09-12

Family

ID=11573077

Family Applications (1)

Application Number Title Priority Date Filing Date
JP401378A Granted JPS5497055A (en) 1977-12-16 1978-01-17 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS5497055A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity
JP2008511093A (en) * 2004-08-23 2008-04-10 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Focus control for media scanning system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4862442A (en) * 1987-04-20 1989-08-29 Mitsubishi Denki Kabushiki Kaisha Focus detecting apparatus utilizing reflecting surface having variable reflectivity or transmissivity
JP2008511093A (en) * 2004-08-23 2008-04-10 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Focus control for media scanning system

Also Published As

Publication number Publication date
JPS6243254B2 (en) 1987-09-12

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