WO2006003797A1 - Capteur optique et enregistreur/lecteur d’informations - Google Patents

Capteur optique et enregistreur/lecteur d’informations Download PDF

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Publication number
WO2006003797A1
WO2006003797A1 PCT/JP2005/011124 JP2005011124W WO2006003797A1 WO 2006003797 A1 WO2006003797 A1 WO 2006003797A1 JP 2005011124 W JP2005011124 W JP 2005011124W WO 2006003797 A1 WO2006003797 A1 WO 2006003797A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light source
information recording
wavelength
recording medium
Prior art date
Application number
PCT/JP2005/011124
Other languages
English (en)
Japanese (ja)
Inventor
Naoharu Yanagawa
Fumihiko Sano
Original Assignee
Pioneer Corporation
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 Pioneer Corporation filed Critical Pioneer Corporation
Priority to JP2006528495A priority Critical patent/JP4340689B2/ja
Publication of WO2006003797A1 publication Critical patent/WO2006003797A1/fr

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Classifications

    • 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
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G11B7/1369—Active plates, e.g. liquid crystal panels or electrostrictive elements
    • 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 an optical pickup device used for recording and reproducing information on an information recording medium such as an optical disk.
  • an information recording / reproducing apparatus such as a compatible player (hereinafter simply referred to as “Compact Disc”) for recording and reproducing data on various optical discs having different standards such as DVD (Digital Versatile Disc) and CD (Compact Disc).
  • DVD Digital Versatile Disc
  • CD Compact Disc
  • Various information recording / reproducing devices are available! Speak.
  • it is desired to improve the recording speed of data on an optical disc such as a DVD-R from the viewpoint of improving user convenience and distinguishing from other products. .
  • the light source used in this type of information recording / reproducing device has increased its heat dissipation as the outputable wattage has improved, and at present, a light source of about 150mW (milliwatt) has been realized from the viewpoint of heat dissipation measures, etc. It has only been done. For this reason, the theoretical maximum recording speed depends on the performance of the light source, and unless a new light source is developed, no further improvement in recording speed can be expected.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2000-173084
  • the present application has been made in view of the circumstances described above.
  • the recording speed for an optical disc such as a DVD-R can be improved while reliably adopting a simple configuration.
  • the optical pickup according to claim 1 condenses the light beam output from the light source power on the information recording medium, and records the information.
  • An optical pickup for receiving reflected light from a recording medium, the first light source outputting a first light beam having a first wavelength, and the second light having a second wavelength different from the first wavelength A second light source that outputs a beam; a light receiving unit that receives the reflected light reflected by the information recording medium and outputs a signal corresponding to the amount of received light; and the reflected light from the information recording medium to the light receiving unit
  • light source control means for outputting both, When both the serial first and second light beam is output characterized in that it comprises a filter control means for controlling said filter to limit transmission of the second beam.
  • the information recording / reproducing apparatus condenses the light beam output from the light source power on the information recording medium, and from the information recording medium Reflection
  • An information recording / reproducing apparatus including an optical pickup for receiving light, wherein the optical pickup includes a first light source that outputs a first light beam having a first wavelength, and a first light source that is different from the first wavelength.
  • a second light source that outputs a second light beam having a wavelength of 2
  • a light receiving unit that receives the reflected light reflected by the information recording medium and outputs a signal corresponding to the amount of received light
  • the information recording A filter that is installed on the optical path of the reflected light from the medium to the light receiving unit and controls transmission of the incident second light beam, controls both the first light source and the second light source, and controls the first light source.
  • the light source control means for outputting one or both of the second light beam and both the first and second light beams are output to control the filter to control the second beam.
  • Filter control means for limiting transmission It is characterized by providing.
  • FIG. 1 is a block diagram showing a configuration of an information recording / reproducing apparatus RP in an embodiment.
  • FIG. 2 is a conceptual diagram showing a focused spot on the optical disc DK and energy distribution on the focused spot in the same embodiment.
  • FIG. 3 is a diagram showing a configuration example when the wavelength filter 18 in the embodiment is configured using an inorganic EC material.
  • FIG. 4 is a diagram showing a configuration example when the wavelength filter 18 in the embodiment is configured using an organic EC material.
  • the information recording / reproducing apparatus RP according to the present embodiment is an application of the information recording / reproducing apparatus of the present application to a compatible player that records and reproduces data with respect to an optical disc DK compatible with both CD and DVD standards.
  • the information recording / reproducing apparatus RP is roughly divided into a signal processing unit SP, a control unit C, a drive circuit D, an optical pickup PU, a servo circuit S, A reproduction unit P;
  • the signal processing unit SP has an input terminal.
  • the signal processing unit SP performs signal processing on the data input via the terminal and outputs the processed data to the control unit C.
  • the specific processing content performed in the signal processing unit SP is arbitrary. For example, after the input data is compressed by a compression method such as MPEG (Moving Picture Experts Group), the data is sent to the control unit C. You may make it output.
  • MPEG Motion Picture Experts Group
  • the control unit C is mainly configured by a CPU (Central Processing Unit) and controls each unit of the information recording / reproducing apparatus RP. For example, when data is recorded on the optical disc DK, the control unit C outputs a drive signal corresponding to the data input from the signal processing unit SP to the drive circuit D. Also, when reproducing data recorded on the optical disc DK, the control unit C outputs a predetermined drive signal to the drive circuit D regardless of whether or not data is input from the signal processing unit SP.
  • a CPU Central Processing Unit
  • the drive circuit D is mainly configured as an amplifier circuit, and amplifies the drive signal input by the control unit C force and supplies the amplified drive signal to the optical pickup PU.
  • the amplification factor in the drive circuit D is controlled by the control unit C.
  • the amplification factor is controlled so that a light beam of “recording power” is output.
  • an optical beam with an energy amount hereinafter referred to as “playback power”
  • the amplification factor is controlled as described above.
  • the optical pickup PU includes, for example, a first light source 11, a second light source 12, and a first beam splitter 1 3, the second beam splitter 14, the actuator unit 15, the condenser lens 16, the photo detector 17, and the wavelength filter 18. Record and read data from DK.
  • the first light source 11 and the second light source 12 are both configured by laser diodes, and output light beams having different wavelengths based on the drive signal supplied to the drive circuit D force.
  • the first light source 11 and the second light source 12 are used to realize data recording and reproduction corresponding to both DVD and CD standards, and the first light source 11 is a light having a wavelength of 660 nm.
  • the second light source 12 outputs a light beam having a wavelength of 780 nm.
  • the light beams output from the first light source 11 and the second light source 12 are applied to the first and second beam splitters 13 and 14 disposed on the optical path of each light beam.
  • the first beam splitter 13 and the second beam splitter 14 are constituted by, for example, dichroic mirrors, and reflect the light beams emitted from the corresponding light sources 11 and 12.
  • the first beam splitter 13 reflects 90% of the 660 nm light beam, transmits 10%, and the 78 Onm light beam. It is possible to adopt a dichroic mirror that transmits 100%, a dichroic mirror that reflects 90% of the 780 nm light beam and transmits 10% of the second beam splitter 14, and transmits 100% of the 660 nm light beam. desirable.
  • the light beams reflected by the first beam splitter 13 and the second beam splitter 14 are transmitted through a wave plate (not shown) provided in the actuator unit 15, and enter the actuator unit 15. It is incident on the installed objective lens and focused on the optical disc DK.
  • the mechanism unit 15 for realizing the light beam condensing function is provided with a mechanism for moving the objective lens.
  • the specific configuration of the actuator unit 15 is arbitrary.
  • the first beam splitter 13 and the second beam are again passed through the objective lens of the actuator unit 15.
  • the light enters the beam splitter 14, passes through the first beam splitter 13 and the second beam splitter 14, and enters the condenser lens 16.
  • the reflected light is condensed on the photodetector 17 by the condenser lens 16.
  • the photodetector 17 is constituted by, for example, a photodiode, receives the light beam emitted from the condenser lens 16, and outputs a signal corresponding to the amount of received light of the reflected light. Specifically, an RF signal corresponding to the amount of reflected light received is output to the control unit C, and signals necessary for tracking servo and focus servo are output to the servo circuit S.
  • the control unit C (a) supplies the RF signal to the reproduction unit P during reproduction, and the data corresponding to the RF signal is supplied. (B) at the time of recording, for example, the address on the optical disc DK is acquired based on the RF signal, or the recording unit P is controlled so that the data is output to the outside via the output terminal. The output timing of the drive signal corresponding to the data to be recorded is determined.
  • the servo circuit S is constituted by an arithmetic circuit, calculates a servo amount related to tracking and focus based on a signal supplied from the photodetector 17, and outputs a control signal corresponding to the calculation result to the actuator unit 15.
  • the actuator unit 15 the position of the objective lens is changed based on the control signal fed back to the servo circuit S force, and tracking servo and focus servo are performed.
  • the photodetector 17 is divided into four parts and a cylindrical lens is adopted as the condenser lens 16.
  • the astigmatism method is used to calculate the servo amount in the servo circuit S.
  • the tracking servo the servo circuit S is calculated based on the amount of received light in each region. Then, the servo amount is calculated.
  • the optical disk DK is irradiated per unit time when attempting to improve the data recording speed with respect to the optical disk DK.
  • the total amount of energy of the light beam irradiated to the optical disc DK is increased because the total amount of energy of the light beam exceeds a predetermined threshold or the temperature on the optical disc DK is required to be a certain value or more. It is necessary to make it.
  • the control unit C performs the following control when data is recorded on and reproduced from the optical disc DK.
  • the control unit C outputs a drive signal corresponding to the data to be recorded on the optical disc DK to the drive circuit D and the drive signal.
  • the drive circuit D is controlled so that the light beam having the recording power is output from both the first light source 11 and the second light source 12.
  • the first light source 11 and the second light source 12 emit light using the signal supplied also to the driving circuit D force, and the light beams output from the light sources 11 and 12, that is, light beams with wavelengths of 660 nm and 780 nm. Both are incident on the first beam splitter 13 and the second beam splitter 14, reflected by both the beam splitters 13 and 14, and applied to the objective lens of the actuator unit 15.
  • FIG. 2 shows the relationship between the focused spot appearing on the optical disc DK at this time and the energy distribution of the light beam in the focused spot.
  • each position on the focused spot is associated with the horizontal axis on the graph.
  • the radii r of the two focused spots with wavelengths of 660 nm and 780 nm are respectively
  • Equation 1 “E” indicates the wavelength, and “ ⁇ ” indicates the numerical aperture in the objective lens.
  • the beam radius is determined substantially depending on the ratio of wavelengths.
  • a 660 nm condensing spot is formed within the 780 nm condensing spot with a radius of about 80%.
  • both spots are in perfect agreement with the central point, and therefore, from the principle of superposition of light.
  • the sum of the amount of energy at each point becomes the amount of energy of the light beam on the optical disc DK.
  • the optical disc DK is actually irradiated with both 780 nm and 660 nm light beams, spherical aberration is considered to occur due to the difference in focal length, resulting in energy loss.
  • the energy can be used with a maximum efficiency of about 70 to 80% for the light beam of 780 nm.
  • the wavelength filter 18 is made of, for example, an EC (Electro Chromic) material, and transmits only a light beam having a predetermined wavelength among incident light beams under the control of the control unit C. It has become.
  • EC materials are materials that cause an electochromism phenomenon in which the absorption wavelength reversibly changes depending on the applied voltage, and there are two systems, organic and inorganic. Examples of inorganic EC materials include W03 (triacid) using electroabsorption reaction.
  • organic EC materials include functional polymers such as polyphenazacillin used as organic EL (Electro Luminescent) materials.
  • Fig. 3 shows a configuration example of the wavelength filter 18 when inorganic EC is used
  • Fig. 4 shows a configuration example of the wavelength filter 18 when organic EC is used.
  • reference numeral 101 denotes a substrate, which is made of a highly permeable base material such as Si02 (silicon dioxide).
  • a transparent electrode 102 is formed on the substrate 101, and an EC layer 103 is formed on the transparent electrode 102 by forming a film by a sol-gel method, a pulling method, vapor deposition, or the like, followed by baking.
  • a transparent electrode 104 is further laminated on the EC layer 103, and as a result, the electoric chromic layer 103 is sandwiched between the transparent electrodes 102 and 104.
  • the transparent electrodes 102 and 104 provided on the wavelength filter 18 are connected to the control unit C, respectively, and the control unit C generates a potential difference between the electrodes 102 and 104, so that the EC layer 103 The absorption wavelength will be changed reversibly.
  • the wavelength filter 18 it is desirable to provide a steep absorption characteristic between 660 nm and 780 nm.
  • Prussian blue is used as the EC layer 1803
  • a plurality of EC layers 1803 formed of different EC materials may be stacked to increase the light beam absorptance of each wavelength.
  • the wavelength filter 18 is configured by bonding two transparent substrates 201 and 204 with a gap and filling the organic EC material 203 between the two substrates. Become. Transparent electrodes 202 and 205 are formed on opposite surfaces of the transparent substrates 201 and 204, respectively. The electrodes 202 and 205 are connected to the control unit C, and the control unit C has a potential difference between the electrodes 202 and 205. Reversible absorption wavelength in organic EC material 203 This will change the target.
  • the wavelength filter 18 when the wavelength filter 18 is employed, a light beam reflected by the wavelength filter 18 is generated in addition to the light beam transmitted and absorbed. Therefore, if the wavelength filter 18 is installed at an angle with the incident axis of the light beam as a normal line, the light beam reflected on the wavelength filter 18 may stray on the optical axis. Therefore, it is necessary that the wavelength filter 18 be installed at a predetermined angle ⁇ with respect to the incident axis of the light beam so that no reflected light is generated on the incident in the filter 18.
  • the wavelength filter 18 is installed closer to the actuator unit 15 than the first beam splitter 13 and the second beam splitter, the light beams output from both light sources absorb before the optical disk DK is irradiated.
  • the wavelength filter since reflection occurs, the wavelength filter must be installed on the photodetector 17 side of both beam splitters 13 and 14 without fail.
  • the wavelength filter 18 As described above, in the information recording / reproducing apparatus RP according to the present embodiment, for example, when information is recorded on a DVD-RW, the light beam reflected on the optical disc DK The light beam having a wavelength of 780 nm is absorbed and reflected by the wavelength filter 18, and only the light beam having a wavelength of 660 nm is transmitted through the wavelength filter 18 and received by the photodetector 17. Then, according to the light beam, signals necessary for the RF signal, tracking servo, and focus servo are obtained according to the amount of light received by the photodetector 18.
  • the control unit C when reproducing the information recorded on the optical disc DK, the control unit C causes only the light source corresponding to the standard of the optical disc DK to be reproduced to emit light. For example, if the optical disc that is to be played back is DK-powered and conforms to the SCD standard, the control unit supplies a drive signal to the first light source 11 to cause the first light source 11 to emit light, while being played back.
  • a drive signal is supplied to the second light source 12 to cause the second light source 12 to emit light.
  • how to control the wavelength filter 18 at the time of reproduction of the optical disk DK is arbitrary, and at the time of reproduction, the transmittance may be controlled to a maximum state, or the reproduction may be performed.
  • the absorption wavelength may be changed according to the standard of the optical disc DK. Yes.
  • the type of the force light source described in the present invention is not limited to this.
  • a light beam having a wavelength of 405 nm is used for recording / reproducing on a Blu-ray disc.
  • the present invention can also be applied to an apparatus provided with a third light source capable of outputting.
  • a design of the light absorption characteristic of the wavelength filter 18 it is necessary to set the light absorption characteristic with respect to the wavelength of the laser light that has also generated at least two kinds of light source powers among the first to third light sources.
  • write-once recording media such as DVD-R and CD-R have wavelength dependence of recording performance depending on the dye used in the medium. Even if laser light having a wavelength is irradiated, there is a possibility that efficient writing cannot be performed. Specifically, laser light with a wavelength of 660 nm is appropriate for writing to DVD-R, and sufficient writing performance may not be obtained even when laser light with a wavelength of 780 nm is simultaneously irradiated. Therefore, when writing to such a recording medium, a single light source (laser light having a wavelength most suitable for the recording medium to be written is irradiated without simultaneously turning on the light sources. Recording may be performed using only a possible light source. In this case, it is preferable that the control unit C detects the type of the recording medium that it intends to write, and determines whether or not laser light irradiation is necessary for each of the plurality of light sources in accordance with the detection result.
  • rewritable recording media such as DVD-RW and DVD-RAM have low wavelength-dependent characteristics of recording performance and can be written by irradiating a sufficient amount of light. It is desirable to actively use. In this case, in order to secure the thermal energy necessary for writing to the recording medium, it is desirable to increase the distribution ratio of the driving current of the light source to the light source that has a short wavelength and can be irradiated with laser light.
  • the information recording / reproducing apparatus RP has the optical pickup PU that collects the light beam output from the light source on the optical disc DK and receives the reflected light from the optical disc DK.
  • the optical pickup PU includes, for example, a first light source 11 that outputs an optical beam having a wavelength of 660 nm and a light beam having a wavelength of 780 nm, for example.
  • a second light source 12 that outputs to the same optical path as the optical path of the output light beam, a photodetector 17 that receives the reflected light of the light beam reflected by the optical disc DK, and outputs a signal according to the amount of received light, It is installed on the optical path of the reflected light from the optical disc DK to the photodetector 17, and controls both the wavelength filter 18 that controls the transmission of the incident light beam, the first light source 11 and the second light source 12, and both the light sources 11 and When one or both of the light beams are output, and the light beams with the wavelengths of 660 nm and 780 nm are output together, the wavelength filter 18 is controlled to transmit the light beam with the wavelength of 780 nm.
  • the control unit C to be restricted is provided!
  • the control unit C controls the wavelength filter 18 and is output from the first light source 11 in the environment where the light beams of both the first light source and the second light source are output. Only the light beam of the wavelength of the light passes through the wavelength filter 18. As a result, only the light beam having a wavelength of 660 nm is received by the photodetector 17. For this reason, for example, when recording data recorded on the optical disc DK, both the first light source 11 and the second light source 12 can also output a light beam, thereby increasing the total energy of the light beam irradiated on the optical disc DK.
  • the wavelength filter 18 includes the electrochromic layer 103 or 203 that changes the wavelength of the light beam that can be transmitted according to the applied voltage value, and the electrochromic layer.
  • the control unit C changes the voltage value applied to the transparent electrode to vary the transmission wavelength of the wavelength filter 18 to change the transmission wavelength of the wavelength filter 18 to 780 nm. It is configured to limit the transmission of a light beam with a wavelength of.
  • the control unit C controls, for example, only the first light source 11 to reproduce the data recorded on the optical disk DK, and has a wavelength of 660 nm. Is configured to output both light beams with wavelengths of 660 nm and 780 nm, for example, while controlling the first light source 11 and the second light source 12 when recording data on the optical disc DK. .
  • the wavelength filter 18 is configured to be installed with a predetermined angle with respect to the optical path of the reflected light from the optical disc DK. ing. Therefore, stray light on the optical axis can be prevented even when a light beam reflected by the wavelength filter 18 is generated.
  • the wavelength filter 18 has been described as an example in which the wavelength filter 18 is made of an EC material V.
  • the wavelength filter 18 is made of a material whose transmittance can be changed according to temperature, such as a cholesteric liquid crystal. 18 may be configured to transmit a light beam having one of the wavelengths by controlling the voltage supplied from the control unit C.
  • the device RP for recording and reproducing information with respect to the optical disc DK corresponding to both the CD and DVD standards has been described.
  • a Blu-ray disc and a CD or a Blu-ray disc and a DVD An apparatus for recording and reproducing information with respect to the optical disc DK corresponding to the above standard can be realized with the same configuration as described above.
  • the light beam output from the first light source 11 and the second light source 12 is directly irradiated to both the first beam splitter 13 and the second beam splitter 14. It has become.
  • a diffraction grating is installed between the light source and the beam splitter, and the light beam output from the first light source 11 or the second light source 12 is divided into a main beam (0th order diffracted light) and a sub beam ( ⁇ 1st order diffracted light). Thereafter, the first beam splitter 13 and the second beam splitter 14 may be irradiated.
  • the photodetector 17 is provided with an area for receiving the main beam and the area is divided into four parts.
  • the area for receiving the sub-beams can be further divided into left and right parts for tracking servo and focus servo using the sub-beams.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Head (AREA)

Abstract

Enregistreur/lecteur d’informations dont la vitesse d’enregistrement pour un disque optique, par exemple un DVD-R, est améliorée tout en employant un agencement simple et permettant d’enregistrer/lire des informations sûrement. Le capteur optique (PU) d’un enregistreur/lecteur d’informations (RP) est pourvu d’une première source lumineuse émettant un faisceau lumineux ayant une longueur d’onde de 660 nm pour respecter les normes CD, et d’une seconde source lumineuse émettant un faisceau lumineux ayant une longueur d’onde de 780 nm pour respecter les normes DVD. Lorsque des données enregistrées sur un disque optique (DK) sont lues, seule une des sources lumineuses respectant les normes du disque optique (DK) est actionnée, alors que les deux première et seconde sources lumineuses sont actionnées au moment de l’enregistrement de données. En outre, le capteur optique (PU) est pourvu d’un filtre à longueur d’onde (18) qui est commandé de telle sorte que seul un faisceau lumineux respectant les normes du disque optique (DK) est reçu par un photodétecteur (17) au moment de l’enregistrement de données sur le disque optique (DK).
PCT/JP2005/011124 2004-06-30 2005-06-17 Capteur optique et enregistreur/lecteur d’informations WO2006003797A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2006528495A JP4340689B2 (ja) 2004-06-30 2005-06-17 光ピックアップ及び情報記録再生装置

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JP2004192951 2004-06-30
JP2004-192951 2004-06-30

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WO2006003797A1 true WO2006003797A1 (fr) 2006-01-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289930A (ja) * 1986-06-07 1987-12-16 Asahi Optical Co Ltd 光デイスク装置
JPH0817065A (ja) * 1994-06-30 1996-01-19 Sony Corp 光ピックアップ装置
JPH0927141A (ja) * 1995-07-10 1997-01-28 Ricoh Co Ltd 光ピックアップ装置
JPH0950629A (ja) * 1995-08-03 1997-02-18 Matsushita Electric Ind Co Ltd 記録再生装置
JPH10233026A (ja) * 1997-02-19 1998-09-02 Sony Corp 光学ピックアップ及び光ディスク装置
JP2003296958A (ja) * 2002-04-01 2003-10-17 Sharp Corp 光ピックアップ装置、及び電子機器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62289930A (ja) * 1986-06-07 1987-12-16 Asahi Optical Co Ltd 光デイスク装置
JPH0817065A (ja) * 1994-06-30 1996-01-19 Sony Corp 光ピックアップ装置
JPH0927141A (ja) * 1995-07-10 1997-01-28 Ricoh Co Ltd 光ピックアップ装置
JPH0950629A (ja) * 1995-08-03 1997-02-18 Matsushita Electric Ind Co Ltd 記録再生装置
JPH10233026A (ja) * 1997-02-19 1998-09-02 Sony Corp 光学ピックアップ及び光ディスク装置
JP2003296958A (ja) * 2002-04-01 2003-10-17 Sharp Corp 光ピックアップ装置、及び電子機器

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JP4340689B2 (ja) 2009-10-07

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