JPS6488930A - Servo signal extracting circuit - Google Patents

Servo signal extracting circuit

Info

Publication number
JPS6488930A
JPS6488930A JP24543987A JP24543987A JPS6488930A JP S6488930 A JPS6488930 A JP S6488930A JP 24543987 A JP24543987 A JP 24543987A JP 24543987 A JP24543987 A JP 24543987A JP S6488930 A JPS6488930 A JP S6488930A
Authority
JP
Japan
Prior art keywords
circuit
laser beam
angle
signal
horizontal synchronizing
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
JP24543987A
Other languages
Japanese (ja)
Inventor
Masamitsu Mishina
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.)
Toshiba Corp
Original Assignee
Toshiba 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 Toshiba Corp filed Critical Toshiba Corp
Priority to JP24543987A priority Critical patent/JPS6488930A/en
Publication of JPS6488930A publication Critical patent/JPS6488930A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To miniaturize and simplify a device by sampling a synchronizing signal part, detecting angle information between a disk surface and a laser beam, controlling the angle of a reflecting mirror, and controlling the angle of the laser beam. CONSTITUTION:A laser beam emitted from a laser beam generator 311 is reflected by a radial mirror 312 and a disk 30 is irradiated through an objective lens 313. The reflecting light is reversed and made incident on a photodetector 314. For a photo-electrically converted higher harmonic signal, a horizontal synchronizing signal is extracted through a higher harmonic amplifier 32 with a BPF 40, the signal is synchronized to the horizontal synchronizing signal from a horizontal synchronizing circuit 43 through a detecting amplifying circuit 41 and sample-held by a sample-hold circuit 42. The output signal of the circuit 42 in accordance with the angle of a disk surface and a laser beam is inputted through an equalizer circuit 43 and a prescribed frequency component is inputted to a driving circuit 44. The circuit 44 applies a driving voltage to a voice coil and changes the angle of the radial mirror 312.
JP24543987A 1987-09-29 1987-09-29 Servo signal extracting circuit Pending JPS6488930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24543987A JPS6488930A (en) 1987-09-29 1987-09-29 Servo signal extracting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24543987A JPS6488930A (en) 1987-09-29 1987-09-29 Servo signal extracting circuit

Publications (1)

Publication Number Publication Date
JPS6488930A true JPS6488930A (en) 1989-04-03

Family

ID=17133679

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24543987A Pending JPS6488930A (en) 1987-09-29 1987-09-29 Servo signal extracting circuit

Country Status (1)

Country Link
JP (1) JPS6488930A (en)

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