US20050053107A1 - Laser power control apparatus - Google Patents

Laser power control apparatus Download PDF

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Publication number
US20050053107A1
US20050053107A1 US10/886,589 US88658904A US2005053107A1 US 20050053107 A1 US20050053107 A1 US 20050053107A1 US 88658904 A US88658904 A US 88658904A US 2005053107 A1 US2005053107 A1 US 2005053107A1
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US
United States
Prior art keywords
laser light
power control
laser
laser power
control apparatus
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.)
Abandoned
Application number
US10/886,589
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English (en)
Inventor
Masamichi Katada
Motonori Taniguchi
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.)
Panasonic Corp
Original Assignee
Matsushita Electric Industrial Co 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Assigned to MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. reassignment MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATADA, MASAMICHI, TANIGUCHI, MOTONORI
Publication of US20050053107A1 publication Critical patent/US20050053107A1/en
Priority to US11/812,292 priority Critical patent/US7548570B2/en
Assigned to PANASONIC CORPORATION reassignment PANASONIC CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/127—Lasers; Multiple laser arrays
    • G11B7/1275—Two or more lasers having different wavelengths
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
    • G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
    • G11B7/1263—Power control during transducing, e.g. by monitoring
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD

Definitions

  • the present invention relates to a laser power control apparatus for controlling laser power in a combination drive which records information or reads recorded information on/from different types of optical disks by applying different laser lights onto the optical disks. More particularly, the present invention relates to a laser power control apparatus for controlling the laser power such that the different laser lights are collected by a common photodetector.
  • the combination drive may be generally represented by one that records and reproduces information on CDs and reproduces information on DVDs, as suggested in Japanese Patent Laid-Open Publication No. 2001-236726, for example.
  • two lasers of different powers, a CD laser and a DVD laser need to be controlled individually.
  • the front monitor 8 is composed of a photodetector.
  • the front monitor 8 collects the CD laser light Lc and generates a laser intensity signal PD 01 having a voltage which is based on the amount of the light collected.
  • the offset adjuster 1 adds a potential which corresponds to a predetermined offset value to the laser intensity signal PD 01 through the adder 20 , thereby generating an offset corrected laser intensity signal S 1 .
  • the combination drive capable of reproducing or recording information on plural types of optical disks
  • only one photodetector is provided which collects laser light to control the power of the laser light, thereby making it possible to produce a compact laser power control apparatus.
  • FIG. 3 is a block diagram illustrating a configuration of a laser power control apparatus according to a third embodiment of the present invention.
  • FIG. 4 is a block diagram illustrating a configuration of a laser power control apparatus according to a fourth embodiment of the present invention.
  • FIG. 5 is a block diagram illustrating a configuration of a laser power control apparatus according to a fifth embodiment of the present invention.
  • FIG. 6 is a block diagram illustrating a configuration of a laser power control apparatus according to a sixth embodiment of the present invention.
  • FIG. 9 is a block diagram illustrating a configuration of a laser power control apparatus according to a ninth embodiment of the present invention.
  • FIG. 12 is a block diagram illustrating a configuration of a laser power control apparatus according to a twelfth embodiment of the present invention.
  • FIG. 13 is a block diagram illustrating a configuration of a laser power control apparatus according to a thirteenth embodiment of the present invention.
  • FIG. 14 is a block diagram illustrating a configuration of a laser power control apparatus according to a fourteenth embodiment of the present invention.
  • a laser power control apparatus LPC 1 has a configuration such that in the conventional laser power control apparatus LP, shown in FIG. 17 , the back monitor 19 of the DVD laser power control system LPdvd is eliminated, and the CD laser power control system LPcd and the DVD laser power control system LPdvd are connected to each other at a junction 11 .
  • the controller 100 is replaced with a controller 100 a.
  • the laser intensity signal PD 0 is generated from one front monitor 8 , the laser intensity signal PD 0 is essentially the same as the aforementioned laser intensity signals PD 01 and PD 02 .
  • a reproduction amplification unit Up and a recording amplification unit Ur are collectively referred to as an “amplification unit U” and the following description also collectively refers them as the “amplification unit U”, as is the case above.
  • the controller 10 a detects whether to use a DVD drive or a CD drive based on an operation mode signal Sm inputted from a combination drive (not shown), and generates a control signal Sca for controlling each component of the laser power control apparatus LPC 1 , in accordance with the drive to be used.
  • a control signal Sca for controlling each component of the laser power control apparatus LPC 1 , in accordance with the drive to be used.
  • an operational amplifier 6 of the DVD laser power control unit LPdvd_ 1 is turned off so that a laser diode LD 2 will not emit light. More specifically, the output of the operational amplifier 6 is pulled up to the power supply voltage. Accordingly, only the CD laser power control system LPcd (CD laser power control unit LPcd_ 1 ) functions and thus the laser power of the laser diode LD 1 is appropriately controlled.
  • the laser power of only the drive to be used is appropriately controlled based on the operation mode (i.e., an operation mode signal Sm) of the combination drive.
  • a laser power control apparatus LPC 2 is a modified version of the laser power control apparatus LPC 1 shown in FIG. 1 , in which the laser power control unit LPdvd_ 1 is replaced with a DVD laser power control unit LPdvd_ 2 and the controller 100 a is replaced with a controller 100 b .
  • the DVD laser power control unit LPdvd_ 2 is different from the DVD laser power control unit LPdvd_ 1 in that a variable gain circuit 9 (referred to as “VGA” in the drawing) is inserted between an operational amplifier 6 and a junction 11 .
  • VGA variable gain circuit 9
  • a laser intensity signal PD 02 (PD 0 ) is gain adjusted by the variable gain circuit 9 and then inputted to the operational amplifier 6 . That is, in order to allow a front monitor 8 , which is essentially used to detect CD laser light Lc, to detect DVD laser light Ld having different intensity characteristics, etc., from the CD laser light Lc, it is necessary to change the sensitivity (voltage gain) of the variable gain circuit 9 to the DVD laser light Ld. In terms of this, in the present embodiment, the necessity of changing the power supply gain of the front monitor 8 itself is eliminated by gain adjusting the laser intensity signal PD 0 by the variable gain circuit 9 . In other words, the front monitor 8 which is used for CD laser light Lc can also be used for DVD laser light Ld having a higher energy, with appropriate sensitivity, without the need to adjust the front monitor 8 itself.
  • the controller 100 b turns off the offset adjuster 1 , variable gain circuit 2 , sample/hold circuit 3 , and operational amplifier 4 of the CD laser power control unit LPcd_ 1 . Accordingly, only the DVD laser power control unit LPdvd_ 2 functions and thus the laser power of the laser diode LD 2 is appropriately controlled.
  • the controller 100 d generates a control signal Scd based on an operation mode signal Sm and controls the laser power control apparatus LPC 4 .
  • the operational amplifier 6 and variable gain circuit 9 of the DVD laser power control unit LPdvd_ 4 are turned off so that a laser diode LD 2 will not emit light. Accordingly, only the CD laser power control unit LPcd_ 1 functions and thus the laser power of a laser diode LD 1 is appropriately controlled.
  • a laser power control apparatus LPC 5 is a modified version of the laser power control apparatus LPC 1 shown in FIG. 1 , in which the laser power control unit LPdvd_ 1 is replaced with a DVD laser power control unit LPdvd_ 5 and the controller 10 a is replaced with a controller 10 e .
  • an operational amplifier 6 is connected between the adder 20 and amplification unit U of the CD laser power control unit LPcd_ 1 through a junction 12 instead of the junction 11 .
  • the controller 100 e generates a control signal Sce based on an operation mode signal Sm and controls the laser power control apparatus LPC 5 .
  • the operational amplifier 6 of the DVD laser power control unit LPdvd_ 5 is turned off so that a laser diode LD 2 will not emit light. Accordingly, only the CD laser power control unit LPcd_ 1 functions and thus the laser power of the laser diode LD 1 is appropriately controlled.
  • a laser power control apparatus LPC 6 is a modified version of the laser power control apparatus LPC 5 shown in FIG. 5 , in which the laser power control unit LPdvd_ 5 is replaced with a DVD laser power control unit LPdvd_ 6 and the controller 100 e is replaced with a controller 100 f .
  • a variable gain circuit 9 is additionally provided between an operational amplifier 6 and a junction 12 .
  • a laser intensity signal PD 0 (PD 01 ) outputted from the variable gain circuit 9 is offset adjusted by an adder 20 and an offset adjuster 1 , then further gain adjusted by the variable gain circuit 9 , and then inputted to the operational amplifier 6 .
  • This configuration provides the same advantageous effect as that obtained by the laser power control apparatus LPC 3 shown in FIG. 3 .
  • the laser power control apparatus LPC 6 can be reduced in circuit size compared to the laser power control apparatus LPC 3 .
  • the controller 100 f generates a control signal Scf based on an operation mode signal Sm and controls the laser power control apparatus LPC 6 .
  • the operational amplifier 6 and variable gain circuit 9 of the DVD laser power control unit LPdvd_ 6 are turned off so that a laser diode LD 2 will not emit light. Accordingly, only the CD laser power control unit LPcd_ 1 functions and thus the laser power of a laser diode LD 1 is appropriately controlled.
  • the controller 100 f turns off the variable gain circuit 2 , sample/hold circuit 3 , and operational amplifier 4 of the CD laser power control unit LPcd_ 1 .
  • the offset value of the offset adjuster 1 is changed to a value appropriate for the laser diode LD 2 .
  • the variable gain circuits 2 and 9 have fixed gain values.
  • the controller 100 g generates a control signal Scg based on an operation mode signal Sm and controls the laser power control apparatus LPC 7 .
  • the operational amplifier 6 and variable gain circuit 9 of the DVD laser power control unit LPdvd_ 7 are turned off so that a laser diode LD 2 will not emit light. Accordingly, only the CD laser power control unit LPcd_ 1 functions and thus the laser power of a laser diode LD 1 is appropriately controlled.
  • the controller 100 g turns off the variable gain circuit 2 , sample/hold circuit 3 , and operational amplifier 4 of the CD laser power control unit LPcd_ 1 .
  • the offset value of an offset adjuster 1 is changed to a value appropriate for the laser diode LD 2 .
  • the variable gain circuits 2 and 9 have fixed gain values.
  • the voltage values of the variable voltage sources 5 and 25 are fixed to predetermined values.
  • a laser power control apparatus LPC 9 is a modified version of the laser power control apparatus LPC 8 shown in FIG. 8 , in which the laser power control unit LPdvd_ 8 is replaced with a DVD laser power control unit LPdvd_ 9 and the controller 100 h is replaced with a controller 100 i .
  • the reference potential PD 2 ref of the operational amplifier 6 is replaced with a variable voltage source 25 .
  • the controller 100 j generates a control signal Scj based on an operation mode signal Sm and controls the laser power control apparatus LPC 10 .
  • the operational amplifier 6 of the DVD laser power control unit LPdvd_ 10 is turned off so that a laser diode LD 2 will not emit light. Accordingly, only the CD laser power control unit LPcd_ 1 functions and thus the laser power of a laser diode LD 1 is appropriately controlled.
  • the controller 100 l turns off a laser drive circuit 7 of the CD laser power control unit LPcd_ 1 , while allowing a sample/hold circuit 3 to operate at all times.
  • the offset value of an offset adjuster 1 and the gain value of the variable gain circuit 2 are changed to values appropriate for the laser diodes LD 1 and LD 2 .
  • the values of a variable voltage source 5 and the variable gain circuit 2 are fixed to predetermined values.
  • the polarity reverser 16 has the function of reversing the polarity of a signal to be inputted, in response to an instruction from the controller 100 m , and outputting the signal. Specifically, a laser intensity signal PD 0 (PD 01 ) outputted from the front monitor 8 undergoes a polarity reversal, if necessary, and then is inputted to the CD laser power control unit LPcd_ 13 .
  • the polarity of a laser intensity signal PD 0 (PD 01 ) is reversed by the polarity reverser 16 , depending on the diode to be driven (i.e., either the laser diode LD 1 or the laser diode LD 2 ).
  • a laser power control apparatus according to the present embodiment will be described.
  • the configuration of a laser power control apparatus LPC 15 is the same as that of the laser power control apparatus LPC 14 shown in FIG. 14 , except that the controller 100 n is replaced with a controller 100 o.
  • a polarity-reversible operational amplifier 4 ′ includes therein a switch SW 1 and a switch SW 2 .
  • the output polarity can be reversed.
  • the controller 100 q turns off the variable gain circuit 2 , the sample/hold circuit 32 , the operational amplifier 41 , and the operational amplifier 42 . Then, when the laser diode LD 1 or LD 2 emits light, the controller 100 q changes the offset value of the offset adjuster 1 .
  • the sample/hold circuit 31 is allowed to operate at all times.
  • the controller 100 q turns off the offset adjuster 1 , the variable gain circuit 2 , the sample/hold circuit 31 , the sample/hold circuit 32 , the operational amplifier 41 , and the operational amplifier 42 .
  • the controller 100 q turns off the offset adjuster 1 , the variable gain circuit 2 , the sample/hold circuit 31 , the sample/hold circuit 32 , and the operational amplifier 41 , and the operational amplifier 42 .
  • This configuration allows the controller to select from a plurality of characteristics depending on the situation, whereby flexibility is increased. Further, since the back monitor can be used, it is also possible to control a laser power in a conventional system. Therefore, this configuration can be applied to combination drives where a reduction in size is sought.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Head (AREA)
  • Optical Recording Or Reproduction (AREA)
US10/886,589 2003-09-04 2004-07-09 Laser power control apparatus Abandoned US20050053107A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US11/812,292 US7548570B2 (en) 2003-09-04 2007-06-18 Laser power control apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2003313065A JP4309212B2 (ja) 2003-09-04 2003-09-04 レーザパワー制御装置
JP2003-313065 2003-09-04

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US11/812,292 Division US7548570B2 (en) 2003-09-04 2007-06-18 Laser power control apparatus

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US20050053107A1 true US20050053107A1 (en) 2005-03-10

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US10/886,589 Abandoned US20050053107A1 (en) 2003-09-04 2004-07-09 Laser power control apparatus
US11/812,292 Active 2025-03-04 US7548570B2 (en) 2003-09-04 2007-06-18 Laser power control apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
US11/812,292 Active 2025-03-04 US7548570B2 (en) 2003-09-04 2007-06-18 Laser power control apparatus

Country Status (6)

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US (2) US20050053107A1 (ja)
EP (1) EP1513143A3 (ja)
JP (1) JP4309212B2 (ja)
KR (1) KR20050025235A (ja)
CN (2) CN1284145C (ja)
TW (1) TW200511230A (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060215532A1 (en) * 2005-03-25 2006-09-28 Yuanping Zhao Optical disc recorder laser power control
US20090252004A1 (en) * 2005-09-09 2009-10-08 Pioneer Corporation Light beam output control device, light beam emission control program, and recording medium on which light beam emission control program is recorded
US20110199673A1 (en) * 2010-02-15 2011-08-18 Panasonic Corporation Integrated optical device and optical pickup device using the same
US20120236887A1 (en) * 2011-03-18 2012-09-20 Semiconductor Components Industries, Llc Optical pickup apparatus, integrated circuit, and method for controlling laser output of optical pickup apparatus

Citations (3)

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Publication number Priority date Publication date Assignee Title
US20030002552A1 (en) * 2001-06-19 2003-01-02 Sony Corporation Laser diode drive circuit and amplifying circuit for optical disc recording and/or reproducing apparatus
US6724792B2 (en) * 2002-09-12 2004-04-20 The Boeing Company Laser diode arrays with replaceable laser diode bars and methods of removing and replacing laser diode bars
US6738339B2 (en) * 2000-02-03 2004-05-18 Samsung Electronics Co., Ltd. Laser diode driver, method of driving the laser diode driver, and method of initializing an optical recording and reproducing apparatus

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JP4604304B2 (ja) * 1999-07-09 2011-01-05 ソニー株式会社 レーザ装置、光学ヘッド及び光記録再生装置
EP1170840B1 (en) * 2000-02-10 2010-11-17 Panasonic Corporation Laser drive device, optical head, and optical information processor
JP2001236726A (ja) * 2000-02-17 2001-08-31 Sanyo Electric Co Ltd 複合ドライブ装置
JP2001244555A (ja) * 2000-03-01 2001-09-07 Pioneer Electronic Corp 自動電力制御回路
JP2002352457A (ja) * 2001-05-24 2002-12-06 Sony Corp 光学ピックアップ
DE10160378A1 (de) * 2001-12-10 2003-06-18 Thomson Brandt Gmbh Wiedergabe- oder Aufzeichnungsgerät für unterschiedliche optische Aufzeichnungsträger
JP2003228867A (ja) 2002-01-31 2003-08-15 Toshiba Corp 光ピックアップ装置及び光ディスク装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6738339B2 (en) * 2000-02-03 2004-05-18 Samsung Electronics Co., Ltd. Laser diode driver, method of driving the laser diode driver, and method of initializing an optical recording and reproducing apparatus
US20040196773A1 (en) * 2000-02-03 2004-10-07 Samsung Electronics Co., Ltd. Laser diode driver, method of driving the laser diode driver, and method of initializing an optical recording and reproducing apparatus
US20040196772A1 (en) * 2000-02-03 2004-10-07 Samsung Electronics Co., Ltd. Laser diode driver, method of driving the laser diode driver, and method of initializing an optical recording and reproducing apparatus
US20030002552A1 (en) * 2001-06-19 2003-01-02 Sony Corporation Laser diode drive circuit and amplifying circuit for optical disc recording and/or reproducing apparatus
US6724793B2 (en) * 2001-06-19 2004-04-20 Sony Corporation Laser diode drive circuit and amplifying circuit for optical disc recording and/or reproducing apparatus
US20040165502A1 (en) * 2001-06-19 2004-08-26 Sony Corporation Laser diode drive circuit and amplifying circuit for optical disc recording and/or reproducing apparatus
US6724792B2 (en) * 2002-09-12 2004-04-20 The Boeing Company Laser diode arrays with replaceable laser diode bars and methods of removing and replacing laser diode bars

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060215532A1 (en) * 2005-03-25 2006-09-28 Yuanping Zhao Optical disc recorder laser power control
US7636377B2 (en) * 2005-03-25 2009-12-22 Lsi Corporation Optical disc recorder laser power control
US20090252004A1 (en) * 2005-09-09 2009-10-08 Pioneer Corporation Light beam output control device, light beam emission control program, and recording medium on which light beam emission control program is recorded
US20110199673A1 (en) * 2010-02-15 2011-08-18 Panasonic Corporation Integrated optical device and optical pickup device using the same
US20120236887A1 (en) * 2011-03-18 2012-09-20 Semiconductor Components Industries, Llc Optical pickup apparatus, integrated circuit, and method for controlling laser output of optical pickup apparatus
US8427917B2 (en) * 2011-03-18 2013-04-23 Semiconductor Components Industries, Llc Optical pickup apparatus, integrated circuit, and method for controlling laser output of optical pickup apparatus

Also Published As

Publication number Publication date
US7548570B2 (en) 2009-06-16
EP1513143A2 (en) 2005-03-09
TW200511230A (en) 2005-03-16
CN1855256A (zh) 2006-11-01
KR20050025235A (ko) 2005-03-14
CN1591594A (zh) 2005-03-09
EP1513143A3 (en) 2007-08-29
JP4309212B2 (ja) 2009-08-05
CN100407312C (zh) 2008-07-30
US20070248129A1 (en) 2007-10-25
CN1284145C (zh) 2006-11-08
JP2005085312A (ja) 2005-03-31

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Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPAN

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Effective date: 20081001