JPS54121102A - Information track tracing device - Google Patents
Information track tracing deviceInfo
- 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
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
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) |
-
1978
- 1978-03-13 JP JP2841978A patent/JPS54121102A/en active Pending
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