JPS6470936A - Two-beam optical head - Google Patents
Two-beam optical headInfo
- 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
Links
Landscapes
- 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.
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62200543A (en) * | 1986-02-27 | 1987-09-04 | Fujitsu Ltd | Optical pickup |
-
1987
- 1987-09-11 JP JP62226339A patent/JP2765839B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62200543A (en) * | 1986-02-27 | 1987-09-04 | Fujitsu Ltd | Optical pickup |
Cited By (6)
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 |