WO2005098839A1 - 対物レンズ及び光ピックアップ装置 - Google Patents
対物レンズ及び光ピックアップ装置 Download PDFInfo
- Publication number
- WO2005098839A1 WO2005098839A1 PCT/JP2005/005489 JP2005005489W WO2005098839A1 WO 2005098839 A1 WO2005098839 A1 WO 2005098839A1 JP 2005005489 W JP2005005489 W JP 2005005489W WO 2005098839 A1 WO2005098839 A1 WO 2005098839A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- objective lens
- optical
- wavelength
- optical disc
- recording
- Prior art date
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
- A01N25/02—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests containing liquids as carriers, diluents or solvents
- A01N25/04—Dispersions, emulsions, suspoemulsions, suspension concentrates or gels
- A01N25/06—Aerosols
-
- 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
- G11B7/1353—Diffractive elements, e.g. holograms or gratings
-
- 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
- G11B7/1372—Lenses
- G11B7/1374—Objective lenses
-
- 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
- G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
- G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive
-
- 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 objective lens and a pickup device.
- an optical disk having a diameter of 12 cm can be used. From 20 to 20 GB of information can be recorded, and if the NA of the objective lens is increased to 0.85, 23 to 27 GB of information can be recorded on a 12 cm diameter optical disc.
- an optical disk and a magneto-optical disk using a blue-violet laser light source are collectively referred to as a “high-density optical disk”.
- NAO NAO
- the other uses an objective lens of NAO. 65 to 0.67 and has a protective layer thickness of Is a 0.6 mm HD DVD (hereinafter abbreviated as HD).
- HD 0.6 mm HD DVD
- the wavelength of the light beam used for a plurality of optical disks and the thickness of the protective substrate are different.
- the degree of divergence of the light beam incident on the objective optical system is changed.
- a technique of providing a diffraction structure on an optical surface of an optical element constituting an optical pickup device is known (for example, see Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-298422
- the invention described in Patent Document 1 is an aberration correction method for achieving compatibility between DV DZCDs by changing the degree of divergence of an incident light beam to an objective optical system.
- high-density optical discs use short wavelength light beams, large NA, and a large difference in protective layer thickness. If the amount of aberration increases, there is a V ⁇ ⁇ problem, and if the off-axis characteristics deteriorate significantly, there is a problem of! / ⁇ ⁇ .
- An object of the present invention is to provide an objective lens that can be used for a high-density optical disc of two standards having different protective layer thicknesses, and an optical pickup device using the objective lens. It is to be.
- the invention described in Item 1 requires at least a wavelength ⁇ l (370 nm ⁇ ⁇ l) for a first optical disk having a protective substrate thickness tl (Omm ⁇ tl ⁇ 0.2 mm). ⁇ 440 nm) to reproduce and Z or record information, and then to the second optical disk having a protective substrate thickness t2 (tl ⁇ t2) using the luminous flux of the wavelength ⁇ 1 to reproduce and read information.
- a predetermined area of the optical surface of the objective lens, and a light beam of the wavelength ⁇ 1 that has passed through the area is the first optical disk and the second optical disk.
- the area that will be used for reproducing and recording or recording information on the optical disc is defined as the first area, and assuming a third optical disc with a protective substrate thickness T (0.13 mm ⁇ T ⁇ 0.25 mm), On the information recording surface of the third optical disk, the optical axis is flat with respect to the objective lens.
- a third-order spherical aberration value SA3 generated when the light beam of the wavelength ⁇ 1 passing through the first region after being incident on the row is collected is:
- the objective lens and optical pickup device are designed to satisfy SA3 ⁇ 0.
- Ol l rms, that is, almost zero, and the first optical disk and the second optical disk are designed using this objective lens and optical pickup device.
- the spherical aberration caused by the difference between the protective substrate thickness T of the third optical disc and the first optical disc and the second optical disc is at a level that can be corrected by, for example, a liquid crystal element.
- FIG. 1 is a plan view of a main part showing a configuration of an optical pickup device.
- FIG. 2 is a sectional view of an objective lens.
- the invention described in Item 2 is the objective lens described in Item 1, wherein, when reproducing and Z or recording information on the first optical disc, the objective lens has the wavelength ⁇ 1.
- the light beam is incident as convergent light.
- the invention described in Item 3 is the objective lens described in Item 2, wherein an optical system magnification ml of the objective lens when reproducing and / or recording information on the first optical disc is lZlOO ⁇ ml. ⁇ lZ55.
- the invention described in Item 4 is the objective lens described in any one of Items 1 to 3, wherein, when reproducing and Z or recording information on the second optical disc, the objective lens is On the other hand, the luminous flux having the wavelength ⁇ 1 is incident as divergent light.
- the invention described in Item 5 is the objective lens described in Item 4, wherein the objective lens is provided with respect to the second optical disc.
- the objective lens is characterized in that the optical system magnification m2 of the objective lens at the time of reproducing and Z or recording information satisfies -1 / I5 ⁇ m2 ⁇ -1Z50.
- the invention described in Item 6 is the objective lens according to any one of Items 1 to 5, wherein at least one optical surface of the objective lens is provided with a first diffraction structure,
- the diffractive structure has a positive diffraction power with respect to the incident light beam having the wavelength ⁇ 1.
- the invention described in Item 7 is the objective lens described in Item 6, wherein the first diffraction structure is used for reproducing and / or recording information on the first optical disc and the second optical disc. It has a function of correcting chromatic aberration of a light beam having a wavelength of ⁇ 1.
- the first optical disc and the second optical disc are provided on the optical surface of the objective lens by providing the first diffractive structure having a positive diffraction power with respect to the incident light beam of the wavelength ⁇ 1. It is possible to correct the chromatic aberration of the light beam of wavelength ⁇ 1 when reproducing and recording or recording information on the optical disk.
- the invention described in Item 8 is the objective lens according to any one of Items 1 to 7, wherein the focal length of the objective lens with respect to the light beam having the wavelength ⁇ 1 is provided.
- the invention described in Item 9 is the object lens according to any one of Items 1 to 8, wherein the luminous flux of the wavelength ⁇ 1 is a predetermined region of the optical surface of the objective lens, and has passed through the region. If the area that is used for reproducing and / or recording information on the first optical disc and is not used for reproducing and / or recording information on the second optical disc is defined as a second area, the second area A second diffractive structure in the area,
- h is the height of the optical axis force
- B is the coefficient of the optical path difference function
- i is a natural number
- ⁇ is the wavelength used
- the diffracted light of wavelength ⁇ 1 generated by the light beam has a diffraction effect opposite to the spherical aberration generated when the wavelength changes due to the lens material, it is possible to correct the spherical aberration characteristics when the wavelength changes and when the temperature changes. Since the amount of spherical aberration when the wavelength or temperature changes is proportional to the fourth power of ⁇ , it is effective to use this technology for BDs with higher ⁇ . Further, even when the second diffraction structure is provided in a region through which a light beam used for HD passes (for example, the first region), it is necessary to correct spherical aberration characteristics at the time of wavelength change or temperature change in HD. Can be done.
- the invention described in Item 10 is the objective lens described in any one of Items 1 to 9, wherein the wave used for reproducing and / or recording information on the first optical disc is used.
- a light beam having a length ⁇ 1 and a light beam having the wavelength ⁇ 1 used for reproducing, recording, or recording information on the second optical disc are emitted from the same light source.
- the invention described in Item 11 is the objective lens described in Item 10, wherein, when reproducing and recording or recording information on the first optical disk and the second optical disk, At least one optical element arranged in the optical path to the objective lens is moved in the optical axis direction.
- the invention described in Item 12 is the objective lens described in Item 11, wherein the optical element is a coupling lens or a beam expander.
- the invention described in Item 13 is the objective lens described in any one of Items 1 to 9, wherein the wave used for reproducing and / or recording information on the first optical disc is used.
- a light beam having a length of ⁇ 1 and a light beam of the wavelength ⁇ 1 used for reproducing, writing, or recording information on or from the second optical disc are emitted from different light sources.
- the invention described in Item 14 is the objective lens described in Item 13, wherein the light that emits the light beam of the wavelength ⁇ 1 when reproducing, recording, or recording information on the first optical disc is performed.
- the objective lens described in Item 13 or 14 emits the light beam of the wavelength ⁇ 1 when reproducing and recording or recording information on the first optical disc.
- the optical distance L is a value that minimizes the wavefront aberration of the converged spot formed on the optical disk by the objective lens when there is no optical element between the coupling lens for guiding light to the objective lens and the light source. Is the distance (air equivalent length) between the coupling lens and the light source.
- the invention described in Item 16 is the objective lens described in any one of Items 1 to 15, wherein the objective lens is constituted by a single lens.
- the invention described in Item 17 is characterized by including the objective lens described in any one of Items 1 to 16.
- an objective lens that can be used for high-density optical discs of two standards having different protective layer thicknesses, and an optical pickup device using the same.
- an optical disk having a protective film having a thickness of about several to several tens nm on the information recording surface, a protective layer or the thickness of the protective film An optical disk with a zero (zero) is also included in the high-density optical disk.
- DVD is a general term for DVD-series optical discs such as DVD-ROM, DVD-Video, DVD-Audio, DVD-RAM DVD-R, DVD-RW DVD + R and DVD + RW.
- the CD is a general term for CD-series optical disks such as CD-ROM, CD-Audio, CD-Video, CD-R, and CD-RW.
- FIG. 1 shows two types of BD (first optical disk) and HD (second optical disk) as high-density optical disks.
- FIG. 4 is a diagram schematically showing a configuration of an optical pickup device PU capable of appropriately performing information recording and Z-reproduction on various types of optical discs.
- the combination of the wavelength, the thickness of the protective layer, and the numerical aperture is not limited to this.
- a high-density optical disk in which the thickness tl of the protective layer PL1 is about 0.1 mm may be used.
- LD1 blue-violet semiconductor laser
- HD blue-violet semiconductor laser
- LD2 light source
- photodetector PD1 for BD photodetector PD2 for HD
- coupling lens CPL through which both light beam of wavelength ⁇ 1 for BD and light beam of wavelength ⁇ 1 for HD pass
- Objective lens OBJ which has the function of condensing the light beam on the information recording surfaces RL1 and RL2, first beam splitter BS1, second beam splitter BS2, third beam splitter BS3, aperture STO, sensor lenses SEN1 and SEN2 And so on.
- the optical surface (incident surface) on the light source side of the objective lens is divided into a first region within a range of a height h around the optical axis and a second region around the first region.
- the light flux 1 does not form a converged spot on the information recording surface RL2 of ⁇ D, and is not used for reproducing and ⁇ or recording information on HD.
- the luminous flux of the wavelength ⁇ 1 for BD that has passed through the second region is ⁇ By forming a condensed spot on the information recording surface RLl of D, it is used for reproducing information on BD and for Z or recording.
- a third optical disk having a protective substrate thickness T (0.13 mm ⁇ T ⁇ 0.25 mm) is virtually arranged in the optical pickup device PU, and the luminous flux having the wavelength ⁇ 1 with respect to the first region.
- the third order spherical aberration value SA3 generated on the information recording surface of the third optical disk when the light is incident as parallel light is adjusted so that the value of -0.011 rms ⁇ SA3 ⁇ 0.01 rms is satisfied.
- the objective lens and the optical pickup device of the invention are designed.
- the third optical disk is virtually arranged without being used in an actual pickup device, and when infinite parallel light having a wavelength of ⁇ 1 is incident on the objective lens, the light flux passing through the first region is used.
- the third-order spherical aberration component SA3 of the wavefront aberration on the formed third optical disc satisfies -0.01 l rms ⁇ SA3 ⁇ 0. Ol rms.
- the objective lens is virtually designed so that the third-order spherical aberration component SA3 is substantially zero in the optical system, and in actual verification, a pickup device serving as the optical system may be newly prepared, It can be easily measured by setting the infinite light arrangement in a general commercially available interferometer. Assuming that such an objective lens is used, if a pickup device is designed in which divergent light is incident on BD with convergent light power HD, the tertiary spherical aberration component SA3 can be practically used when each optical disc is used. This can be suppressed to a level where there is no problem, and compatibility between BD and HD can be achieved.
- the blue-violet semiconductor laser LD1 is first made to emit light, as shown by the ray path of the solid line in FIG.
- the divergent light beam emitted from the blue-violet semiconductor laser LD1 passes through the first beam splitter BS1 and the second beam splitter BS2, and reaches the coupling lens CPL.
- the divergence angle of the luminous flux of the wavelength ⁇ 1 for BD is changed so as to slightly enter the objective lens as convergent light when transmitting through the coupling lens CPL.
- the optical system magnification ml of the objective lens should be within the range of lZlOO ⁇ ml ⁇ lZ55. It is preferable that the focal length f of the objective lens which is preferable to be set is within a range of 0.8 mm ⁇ f ⁇ 3.5 mm.
- the luminous flux of the wavelength ⁇ 1 for BD whose divergence angle has been changed to slightly converge by the coupling lens CPL is emitted from the first and second regions on the incident surface of the objective lens OBJ. Upon passing through the surface, it undergoes a refraction effect, and is condensed on the information recording surface RL1 via the protective layer PL1 of the BD to form a spot.
- the objective lens OBJ performs focusing / tracking by a two-axis actuator AC (not shown) arranged around the objective lens OBJ.
- the reflected light flux modulated by the information pits on the information recording surface RL1 passes again through the objective lens OBJ, the coupling lens CPL, and the second beam splitter BS2, is branched by the first beam splitter BS1, and is not split by the sensor lens SEN1. It is given astigmatism and converges on the light receiving surface of the photodetector PD1. Then, information recorded on the BD can be read using the output signal of the photodetector PD1.
- the blue-violet semiconductor laser LD2 When recording and reproducing information Z on HD, first, the blue-violet semiconductor laser LD2 is caused to emit light, as indicated by the dotted line in FIG.
- the divergent light beam emitted from the blue-violet semiconductor laser LD2 passes through the third beam splitter BS3, is reflected by the second beam splitter BS2, and reaches the coupling lens CPL.
- the divergence angle of the luminous flux of the wavelength ⁇ 1 for HD is changed so as to slightly enter the objective lens as divergent light when passing through the coupling lens CPL.
- the magnification m2 of the optical system of the objective lens be in the range of -lZl5 ⁇ m2 ⁇ -lZ50.
- the luminous flux of the wavelength ⁇ 1 for HD whose divergence angle has been changed to slightly diverge light by the coupling lens CPL reaches the incident surface of the objective lens, and the luminous flux passing through the first region is When the light passes through the first region and the light exit surface, it undergoes a refraction action, and is condensed on the information recording surface RL2 via the HD protective layer PL2 to form a spot.
- the luminous flux that has passed through the second region is refracted by the second region and the exit surface so as not to form a converging spot on the HD information recording surface RL2. Or not used for records.
- the objective lens OBJ is connected to a two-axis actuator AC (shown in FIG. Focusing / Tracking is performed by
- the reflected light flux modulated by the information pits on the information recording surface RL2 passes through the objective lens OBJ and the coupling lens CPL again, is branched by the second beam splitter BS2 and the third beam splitter BS3, and is split by the sensor lens SEN2.
- Astigmatism is given and converges on the light receiving surface of the photodetector PD2.
- the information recorded on the HD can be read using the output signal of the photodetector PD2.
- a diffraction structure (first diffraction structure) having a positive diffraction power with respect to the incident light beam of wavelength ⁇ 1 is provided on the optical surface of the objective lens.
- the chromatic aberration of the light beam having the wavelength ⁇ 1 at the time of reproducing and / or recording information may be corrected.
- the description is omitted.
- a diffraction structure (second diffraction structure) may be provided in the second region.
- the second diffraction structure is represented by an optical path difference defined by the following optical path difference function ⁇ (h) added to the transmitted wavefront by the second diffraction structure;
- h is the height of the optical axis force
- B is the coefficient of the optical path difference function
- i is a natural number
- ⁇ is the wavelength used
- the diffracted light has the diffraction effect opposite to the spherical aberration generated when the wavelength changes due to the lens material, it is possible to correct the spherical aberration characteristics when the wavelength changes or the temperature changes. Since the amount of spherical aberration at the time of wavelength change or temperature change is proportional to the fourth power of ⁇ , it is effective to use this technology for BDs with higher ⁇ . Further, even when the second diffraction structure is provided in a region through which a light beam used for HD passes (for example, the first region), spherical aberration characteristics at the time of wavelength change or temperature change are corrected in HD. be able to.
- a blue-violet semiconductor laser LD 1 that emits a light beam having a wavelength ⁇ 1 used for reproducing and Z or recording information on the first optical disc, and a second optical disc Emits a luminous flux of wavelength ⁇ 1 used for reproducing and recording or
- the blue-violet semiconductor laser LD2 to be emitted is arranged separately, the invention is not limited to this, and the same light source may be used.
- the light source itself or at least one optical element (for example, the coupling lens CPL in FIG. 1) disposed in the optical path is connected to the optical axis depending on the type of the optical disc on which the reproduction, Z, or recording is performed.
- the divergence angle of the light beam incident on the objective lens may be appropriately adjusted by moving in the direction.
- the blue-violet semiconductor laser LD1 and the blue-violet semiconductor laser LD2 are arranged separately as in the above embodiment, the blue-violet semiconductor laser LD1 is separated from the blue-violet semiconductor laser LD2.
- the optical distance between the blue-violet semiconductor laser LD1 and the blue-violet semiconductor laser LD2 be 4 mm ⁇ L ⁇ 6 mm. .
- the optical surface on the light source side of the single-lens objective lens has a first area (second surface) having a height h of 0 mm ⁇ h ⁇ 2. It is divided into the 2nd area (2nd plane) of 01mm ⁇ h.
- Table 1 shows the lens data of the objective lens of the first embodiment.
- NA1 0.85
- magnification m2 -1 / 18.3
- image-side numerical aperture NA2 0.65 Is set to
- the luminous flux is collected on the substrate of the third optical disk having a substrate thickness of 0.18 mm.
- the tertiary spherical aberration component of the wavefront aberration of the focused light spot is 0 ⁇ .
- the wavefront aberration of the spot focused on the BD (first optical disc) is 0.059 ⁇
- the wavefront aberration of the spot focused on the HD (second optical disc) is 0.004 ⁇ .
- Table 2 shows lens data of the objective lens of the second example.
- Image-side numerical aperture NA1 0.85 ⁇ 2 ⁇ 65
- the light beam when infinite parallel light enters the second surface (0 mm ⁇ h ⁇ 2.01 mm) of the objective lens, the light beam is focused on the substrate of the third optical disk having a substrate thickness of 0.14 mm. And that The third-order spherical aberration component of the wavefront aberration of the focused spot is 0 ⁇ .
- the wavefront aberration of the spot focused on the BD is 0.037 ⁇
- the wavefront aberration of the spot focused on the HD is 0.004 ⁇ .
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/562,156 US20060164967A1 (en) | 2003-08-08 | 2005-03-25 | Objective lens and optical pickup device |
JP2006519449A JPWO2005098839A1 (ja) | 2004-04-02 | 2005-03-25 | 対物レンズ及び光ピックアップ装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004109928 | 2004-04-02 | ||
JP2004-109928 | 2004-04-02 |
Publications (1)
Publication Number | Publication Date |
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WO2005098839A1 true WO2005098839A1 (ja) | 2005-10-20 |
Family
ID=35125318
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/005489 WO2005098839A1 (ja) | 2003-08-08 | 2005-03-25 | 対物レンズ及び光ピックアップ装置 |
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Country | Link |
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US (1) | US20060164967A1 (ja) |
JP (1) | JPWO2005098839A1 (ja) |
WO (1) | WO2005098839A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008293629A (ja) * | 2007-04-26 | 2008-12-04 | Ricoh Co Ltd | 光ピックアップおよび光情報処理装置 |
Families Citing this family (1)
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JP5970572B1 (ja) * | 2015-02-13 | 2016-08-17 | 株式会社フジクラ | 車両用ヘッドランプ |
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JPH09311271A (ja) * | 1996-05-20 | 1997-12-02 | ソニー株式会社 | 対物レンズ及び光学ピックアップ装置 |
JPH10289464A (ja) * | 1997-04-17 | 1998-10-27 | Sharp Corp | 対物レンズ及び光ピックアップ装置 |
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JP4610118B2 (ja) * | 2001-03-30 | 2011-01-12 | Hoya株式会社 | 光ヘッド用対物レンズ |
WO2002086577A1 (fr) * | 2001-04-17 | 2002-10-31 | Matsushita Electric Industrial Co., Ltd. | Lentille d'objectif, appareil a tete optique, appareil d'enregistrement/de reproduction d'information optique |
JP2002324333A (ja) * | 2001-04-26 | 2002-11-08 | Konica Corp | 光ピックアップ装置及びその対物レンズ |
JP3804826B2 (ja) * | 2001-11-15 | 2006-08-02 | コニカミノルタホールディングス株式会社 | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 |
JP4259067B2 (ja) * | 2002-02-22 | 2009-04-30 | コニカミノルタホールディングス株式会社 | 光ピックアップ装置の対物光学素子、光ピックアップ装置及び光情報記録再生装置 |
JP4488334B2 (ja) * | 2003-01-09 | 2010-06-23 | Hoya株式会社 | 光ディスク用対物レンズ |
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2005
- 2005-03-25 JP JP2006519449A patent/JPWO2005098839A1/ja active Pending
- 2005-03-25 WO PCT/JP2005/005489 patent/WO2005098839A1/ja active Application Filing
- 2005-03-25 US US10/562,156 patent/US20060164967A1/en not_active Abandoned
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JPH0943510A (ja) * | 1995-07-28 | 1997-02-14 | Konica Corp | 光情報記録媒体の記録再生用光学系 |
JPH09311271A (ja) * | 1996-05-20 | 1997-12-02 | ソニー株式会社 | 対物レンズ及び光学ピックアップ装置 |
JPH10289464A (ja) * | 1997-04-17 | 1998-10-27 | Sharp Corp | 対物レンズ及び光ピックアップ装置 |
JPH1186319A (ja) * | 1997-09-09 | 1999-03-30 | Konica Corp | 光ピックアップ装置 |
JP2001249273A (ja) * | 1999-12-28 | 2001-09-14 | Asahi Optical Co Ltd | 光ヘッド用対物レンズ |
JP2002342969A (ja) * | 2001-05-16 | 2002-11-29 | Konica Corp | 光ピックアップ装置用の対物レンズ及び光ピックアップ装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008293629A (ja) * | 2007-04-26 | 2008-12-04 | Ricoh Co Ltd | 光ピックアップおよび光情報処理装置 |
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US20060164967A1 (en) | 2006-07-27 |
JPWO2005098839A1 (ja) | 2008-02-28 |
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