JPS5736444A - Displacing device of light spot - Google Patents

Displacing device of light spot

Info

Publication number
JPS5736444A
JPS5736444A JP11196480A JP11196480A JPS5736444A JP S5736444 A JPS5736444 A JP S5736444A JP 11196480 A JP11196480 A JP 11196480A JP 11196480 A JP11196480 A JP 11196480A JP S5736444 A JPS5736444 A JP S5736444A
Authority
JP
Japan
Prior art keywords
electrode
piezoelectric element
shifter
amplifier
oscillator
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
JP11196480A
Other languages
Japanese (ja)
Inventor
Mitsushige Kondo
Kenjirou Kime
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 JP11196480A priority Critical patent/JPS5736444A/en
Publication of JPS5736444A publication Critical patent/JPS5736444A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Mechanical Optical Scanning Systems (AREA)

Abstract

PURPOSE:To stabilize the working against the fluctuation of temperature for a device that performs an automtic focus adjustment by driving the lens with a piezoelectric element, by setting the piezoelectric element within a loop of an oscillator. CONSTITUTION:An exciting electrode 20 and a vibration state detecting electrode 21 are formed on the surface of a piezoelectric element 60; while a common electrode 22 is formed on the rear surface to be earthed. The signal C detected by the electrode 21 is applied to a phase shifter and amplified by an amplifier 25 to be applied to the electrode 20. The extent of phase shift is set for the shifter 24 so that a closed loop comprising the piezoelectric oscillator 60, the shifter 24 and the amplifier 25 has a positive feedback. The resonance frequency of this system varies as the ambient temperature changes, but the amplitude of vibration has no change.
JP11196480A 1980-08-11 1980-08-11 Displacing device of light spot Pending JPS5736444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11196480A JPS5736444A (en) 1980-08-11 1980-08-11 Displacing device of light spot

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11196480A JPS5736444A (en) 1980-08-11 1980-08-11 Displacing device of light spot

Publications (1)

Publication Number Publication Date
JPS5736444A true JPS5736444A (en) 1982-02-27

Family

ID=14574547

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11196480A Pending JPS5736444A (en) 1980-08-11 1980-08-11 Displacing device of light spot

Country Status (1)

Country Link
JP (1) JPS5736444A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501233A (en) * 1982-06-30 1984-07-12 イ−ストマン・コダック・カンパニ− Focusing and tracking control device for optical disc writing/reading
JPS6299022U (en) * 1985-12-11 1987-06-24
CN111201107A (en) * 2017-10-12 2020-05-26 普雷茨特两合公司 Device for a laser processing system, laser processing system having such a device and method for adjusting the focal position of an optical element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59501233A (en) * 1982-06-30 1984-07-12 イ−ストマン・コダック・カンパニ− Focusing and tracking control device for optical disc writing/reading
JPS6299022U (en) * 1985-12-11 1987-06-24
CN111201107A (en) * 2017-10-12 2020-05-26 普雷茨特两合公司 Device for a laser processing system, laser processing system having such a device and method for adjusting the focal position of an optical element

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