JPS6470936A - Two-beam optical head - Google Patents

Two-beam optical head

Info

Publication number
JPS6470936A
JPS6470936A JP62226339A JP22633987A JPS6470936A JP S6470936 A JPS6470936 A JP S6470936A JP 62226339 A JP62226339 A JP 62226339A JP 22633987 A JP22633987 A JP 22633987A JP S6470936 A JPS6470936 A JP S6470936A
Authority
JP
Japan
Prior art keywords
wavelength
reproducing
recording
spot
enters
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.)
Granted
Application number
JP62226339A
Other languages
Japanese (ja)
Other versions
JP2765839B2 (en
Inventor
Shigeru Nakamura
Takeshi Maeda
Takeshi Kato
Takeshi Nakao
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP62226339A priority Critical patent/JP2765839B2/en
Priority to KR1019880003050A priority patent/KR910004265B1/en
Priority to US07/173,658 priority patent/US4901325A/en
Publication of JPS6470936A publication Critical patent/JPS6470936A/en
Application granted granted Critical
Publication of JP2765839B2 publication Critical patent/JP2765839B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Optical Head (AREA)

Abstract

PURPOSE:To obtain a thin type two-beam optical head capable of simultaneous erasing, recording and reproducing, by providing two spots by two semiconductor laser beams having a different wavelength and the special separately means of the reflecting beam. CONSTITUTION:Laser chips 11 and 12 independently radiate laser beams for recording a comparatively long wavelength and for reproducing a short wavelength respectively and are contracted through a collimator lens 13, a 1/2 wavelength plate 14, a beam splitter 15, a mirror 16 and a focus range 17 to a track on a disk 18 as a spot 21 for recording and a spot 22 for reproducing. A reflecting beam is reversely proceeded, enters a wavelength passes, passes through lenses 24 and 25, enters a focus dislocation and track dislocation detecting optical system composed of a knife edge 26 and a division type light detector 27, a short wavelength is reflected and introduced to a magnet optical signal detecting optical system composed of an analyzer 28 and a photodetector 29.
JP62226339A 1987-03-26 1987-09-11 2-beam optical head Expired - Fee Related JP2765839B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP62226339A JP2765839B2 (en) 1987-09-11 1987-09-11 2-beam optical head
KR1019880003050A KR910004265B1 (en) 1987-03-26 1988-03-22 Semiconductor laser system and manufacture method and light head
US07/173,658 US4901325A (en) 1987-03-26 1988-03-25 Semiconductor laser device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62226339A JP2765839B2 (en) 1987-09-11 1987-09-11 2-beam optical head

Publications (2)

Publication Number Publication Date
JPS6470936A true JPS6470936A (en) 1989-03-16
JP2765839B2 JP2765839B2 (en) 1998-06-18

Family

ID=16843619

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62226339A Expired - Fee Related JP2765839B2 (en) 1987-03-26 1987-09-11 2-beam optical head

Country Status (1)

Country Link
JP (1) JP2765839B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03254432A (en) * 1990-03-02 1991-11-13 Pioneer Electron Corp Optical pickup
US5353274A (en) * 1991-10-22 1994-10-04 Canon Kabushiki Kaisha Beam diameter expansion of a multi-beam optical information system
JPH07193340A (en) * 1993-11-22 1995-07-28 Xerox Corp Nonmonolithic array of diode laser located accurately
US7035192B2 (en) 1999-01-19 2006-04-25 Matsushita Electric Industrial Co., Ltd. Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus
US7672349B2 (en) 2005-08-08 2010-03-02 Sony Corporation Laser diode

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62200543A (en) * 1986-02-27 1987-09-04 Fujitsu Ltd Optical pickup

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62200543A (en) * 1986-02-27 1987-09-04 Fujitsu Ltd Optical pickup

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03254432A (en) * 1990-03-02 1991-11-13 Pioneer Electron Corp Optical pickup
US5353274A (en) * 1991-10-22 1994-10-04 Canon Kabushiki Kaisha Beam diameter expansion of a multi-beam optical information system
JPH07193340A (en) * 1993-11-22 1995-07-28 Xerox Corp Nonmonolithic array of diode laser located accurately
US7035192B2 (en) 1999-01-19 2006-04-25 Matsushita Electric Industrial Co., Ltd. Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus
US7215476B2 (en) 1999-01-19 2007-05-08 Matsushita Electric Industrial Co., Ltd. Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus
US7672349B2 (en) 2005-08-08 2010-03-02 Sony Corporation Laser diode

Also Published As

Publication number Publication date
JP2765839B2 (en) 1998-06-18

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees