JPS54121102A - Information track tracing device - Google Patents

Information track tracing device

Info

Publication number
JPS54121102A
JPS54121102A JP2841978A JP2841978A JPS54121102A JP S54121102 A JPS54121102 A JP S54121102A JP 2841978 A JP2841978 A JP 2841978A JP 2841978 A JP2841978 A JP 2841978A JP S54121102 A JPS54121102 A JP S54121102A
Authority
JP
Japan
Prior art keywords
disc
reflected light
track
detector
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
JP2841978A
Other languages
Japanese (ja)
Inventor
Tadao Nagai
Kenjiro Kime
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.)
Teac Corp
Mitsubishi Electric Corp
Original Assignee
Teac Corp
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 Teac Corp, Mitsubishi Electric Corp filed Critical Teac Corp
Priority to JP2841978A priority Critical patent/JPS54121102A/en
Publication of JPS54121102A publication Critical patent/JPS54121102A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Control Of Position Or Direction (AREA)

Abstract

PURPOSE: To simplify the constitution by drawing out track position deviation information from the modulation-reflected light through high frequency fine vibration of a condensing lens in the optical axis direction.
CONSTITUTION: the laser light from a laser 1 radiates the surface of a disc 7 through a condensing lens 6. When this lens 6 is finely vibrated at high frequencies in its optical axis direction through an oscillator 11, the radiation point of the disc 7 finely moves and the reflected light intensity from the surface of the disc 7 changes according to the condition of tracking, thus the modulation-reflected light corresponding to the frequency twice that of the fine vibrations is detected with a photo detector 8. Hence, if the AC fluctuation components outputted by the detector 8 are drawn out with a filter 10 and are phase detected with a phase detector 12 to which the transmission output of the oscillator 11 is applied, then the information on the track position deviation and direction is drawn out and the sure tracing of the track such as of the disc or other may be performed. Thereby, the need for track detecting beam or the like is eliminated.
COPYRIGHT: (C)1979,JPO&Japio
JP2841978A 1978-03-13 1978-03-13 Information track tracing device Pending JPS54121102A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2841978A JPS54121102A (en) 1978-03-13 1978-03-13 Information track tracing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2841978A JPS54121102A (en) 1978-03-13 1978-03-13 Information track tracing device

Publications (1)

Publication Number Publication Date
JPS54121102A true JPS54121102A (en) 1979-09-20

Family

ID=12248127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2841978A Pending JPS54121102A (en) 1978-03-13 1978-03-13 Information track tracing device

Country Status (1)

Country Link
JP (1) JPS54121102A (en)

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