JPS61158045A - Light head - Google Patents

Light head

Info

Publication number
JPS61158045A
JPS61158045A JP27886384A JP27886384A JPS61158045A JP S61158045 A JPS61158045 A JP S61158045A JP 27886384 A JP27886384 A JP 27886384A JP 27886384 A JP27886384 A JP 27886384A JP S61158045 A JPS61158045 A JP S61158045A
Authority
JP
Japan
Prior art keywords
degree light
recording
light
tracking
laser
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
JP27886384A
Other languages
Japanese (ja)
Inventor
Tsutomu Matsui
Original Assignee
Nec Home Electronics Ltd
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 Nec Home Electronics Ltd filed Critical Nec Home Electronics Ltd
Priority to JP27886384A priority Critical patent/JPS61158045A/en
Publication of JPS61158045A publication Critical patent/JPS61158045A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To detect tracking without being affected by recording bits at the time of recording by separating a laser beam into three beams, i.e. 0-degree light and ±1-degree light, using the 0-degree light as a laser beam exclusively used for recording or reading, and using either of ±1-degree light as a laser beam exclusively used for tracking detection.
CONSTITUTION: Half width pits 29a, 29b deformed according to tracking detec tion signals f1, f2 of different frequencies, i.e. modulated by tracking detection signals f1, f2 on side walls 28a, 28b are formed at the boundary between side walls 28a, 28b of a recording track 26. After dividing the laser beam into three beams of 0-degree light and ±1-degree light, the beams are irradiated alongh the recording track. Recording or reproducing is made by the 0-degree light, and at the same time, the level difference between tracking detection signals f1, f2 included in the output signal of a light receiving section that receives reflected light of either of ±1-degree light is outputted as a tracking error signal.
COPYRIGHT: (C)1986,JPO&Japio
JP27886384A 1984-12-28 1984-12-28 Light head Pending JPS61158045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27886384A JPS61158045A (en) 1984-12-28 1984-12-28 Light head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27886384A JPS61158045A (en) 1984-12-28 1984-12-28 Light head

Publications (1)

Publication Number Publication Date
JPS61158045A true JPS61158045A (en) 1986-07-17

Family

ID=17603177

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27886384A Pending JPS61158045A (en) 1984-12-28 1984-12-28 Light head

Country Status (1)

Country Link
JP (1) JPS61158045A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5216646A (en) * 1988-11-16 1993-06-01 Matsushita Electric Industrial Co., Ltd. Tracking system in recording/reproducing apparatus
US5311491A (en) * 1989-09-22 1994-05-10 Sony Corporation Method of data recording for optical disc having burst modulated track
US5469416A (en) * 1989-08-25 1995-11-21 Sony Corporation Apparatus for reproducing recorded data and selectively either of read-only or recorded synchronization information from a magneto-optical recording medium

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5479603A (en) * 1977-12-07 1979-06-25 Canon Inc Tracking device
JPS595449A (en) * 1982-06-30 1984-01-12 Matsushita Electric Ind Co Ltd Recording carrier for optical disk

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5479603A (en) * 1977-12-07 1979-06-25 Canon Inc Tracking device
JPS595449A (en) * 1982-06-30 1984-01-12 Matsushita Electric Ind Co Ltd Recording carrier for optical disk

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5216646A (en) * 1988-11-16 1993-06-01 Matsushita Electric Industrial Co., Ltd. Tracking system in recording/reproducing apparatus
US5469416A (en) * 1989-08-25 1995-11-21 Sony Corporation Apparatus for reproducing recorded data and selectively either of read-only or recorded synchronization information from a magneto-optical recording medium
US5587901A (en) * 1989-08-25 1996-12-24 Sony Corporation Optical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of information
US5949746A (en) * 1989-08-25 1999-09-07 Sony Corporation Method for reproducing information recorded on an optical recording medium having a pre-formed recording track which is offset along its width to record frame sync signals of the information recorded on the medium
US5311491A (en) * 1989-09-22 1994-05-10 Sony Corporation Method of data recording for optical disc having burst modulated track

Similar Documents

Publication Publication Date Title
TW412727B (en) Bi-level optical media having embossed header format
KR880003309A (en) Optical disc drive
US4623994A (en) Scanning servo system for optical-disc information reproducing apparatus
EP0077642A3 (en) Three beam optical memory system
JPS60261043A (en) Information recording medium disc
JPS6074129A (en) Tracking servo-circuit of optical disk
JPS5965946A (en) Video disk player
US4963464A (en) Optical medium having pits of different depths, and method and apparatus for reproducing information therefrom
JPS62170027A (en) Information recording medium and recording/reproducing method
JPS6370950A (en) Magneto-optical signal reproducer
EP0801382A3 (en) Optical information recording/reproducing device and method for recording/reproducing information
JPS59185048A (en) Member for recording optical information and its recording method
JPS5877036A (en) Detecting method of tracking error
JPS60242530A (en) Optical disk
MY130581A (en) Write once optical disc recording apparatus
JPS63231733A (en) Optical information reproduction system
JPS57208647A (en) Optical disk for recording of information
EP0426879A4 (en) Optical recording and/or reproducing apparatus
JPS6194246A (en) Tracking error detection system
JPS629552A (en) Signal reproducing device
JPS63255846A (en) Optical disk with guide groove
JPH04289515A (en) Recording laser intensity setting method and laser recorder
US20020048251A1 (en) Prepit detection unit
JPS58158038A (en) Optical disc device
JPH01137440A (en) Optical information recording medium