WO2005006321A1 - 光ピックアップ用レンズ装置及びそれを用いた情報記録再生装置 - Google Patents
光ピックアップ用レンズ装置及びそれを用いた情報記録再生装置 Download PDFInfo
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- WO2005006321A1 WO2005006321A1 PCT/JP2004/010159 JP2004010159W WO2005006321A1 WO 2005006321 A1 WO2005006321 A1 WO 2005006321A1 JP 2004010159 W JP2004010159 W JP 2004010159W WO 2005006321 A1 WO2005006321 A1 WO 2005006321A1
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- lens
- aberration
- optical
- light
- information recording
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Classifications
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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
- G11B7/135—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
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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
- G11B7/135—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
- G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means
-
- 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
- G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
- G11B7/1367—Stepped phase plates
-
- 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
- G11B7/1376—Collimator 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
- G11B7/1372—Lenses
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
Definitions
- the present invention relates to a lens device for an optical pickup, and more particularly, to a D device using a light beam having a wavelength of 390 nm to 420 nm.
- VD (D) i-gital Vers atile! Disk): For optical pickups applied to optical information recording devices capable of high-density recording, such as optical recording devices for devices and computers.
- the present invention relates to an information recording / reproducing device including the above-described lens device for optical pickup.
- the lens equipment for optical pick-up V has a light source wavelength of 6 mm.
- optical information recording clothing such as DVD players Rw, which are currently widely used in DVD recorders, etc., use the phase change of the medium to record and erase information, so they may insert information.
- the optical information recording device using a phase-change type medium is different from the optical information used for erasing or erasing data and the optical data used for taking in the written information.
- L recording or erasing and reproduction it is in principle unavoidable that the wavelength of the luminous flux emitted by the light source changes in magnitude ⁇ .
- the chromatic aberration of the lens device is important. If the light is not corrected, the change in the wavelength of the light emitted by the light source may cause a sharp focus occupation, a position or a movement, and the force control may not be performed. Conventionally, in order to suppress these chromatic aberrations, JP-A-644-1
- Chromatic aberration correction of the objective lens element as described in JP-A-9316, JP-A-7-294-707, and JP-A-11-37878 Technology to provide functions, U-lens placed between the light source and the objective lens element to have chromatic aberration correction function, Introduce a separate chromatic aberration correction element in the optical path to overcorrect chromatic aberration Disclosure of the invention in which a technique for canceling chromatic aberration of the objective lens element by using
- each component that realizes the conventional chromatic aberration correction is The spot diameter is very small, and the track width is also very narrow. This is insufficient for a lens unit for optical pickup of an information recording medium of high-density recording. Was.
- One of the above targets is achieved by the following light pick-up lens garment: 390 nm to 4 nm radiated from the light source.
- the light source radiates in order from the light source side along the optical axis of the light beam emitted from the light source.
- the lens is movably held, and the light beam is converted into a parallel light beam or a predetermined light beam; a re-measuring means for converting the light beam into convergent or divergent light;
- the correction element and the objective lens element are oriented in a direction perpendicular to the optical axis in order to track the information recording medium. All are integrally held, to satisfy the following conditions
- the aberration correction element is a diffraction lens having a pattern that deflects the light beam by diffraction.
- the aberration correction element is located at the center of the optical axis. The world defined by concentric circles
- a phase step surface including a plurality of ring-shaped regions and a phase step formed at a boundary between the regions
- One of the above-mentioned targets is to form a spot by condensing a light beam on an information recording medium formed by the following optical pickup device.
- Optical pick-up device that performs a small amount of
- a light source that emits a light beam in the wavelength range of 420 nm from 0 ⁇ m; and a light source that is held so as to be movable along the optical axis of the light beam emitted from the light source.
- a convergence means for converting the light into a convergence or divergence light, an aberration correction element for transmitting the luminous flux radiated from the U-means, and an aberration correction element having an aperture of 0 • 8 or more.
- an objective lens element for forming a spot by condensing a light beam emitted from the information recording medium on an information recording medium. It is physically held in the direction of the optical axis to track the difference compensator and the objective recording medium, and satisfies the following conditions:
- the present invention it is possible to provide a lens device for an optical pickup capable of performing stable tracking while having a large chromatic aberration correction function, and an information recording / reproducing garment using the lens device.
- FIG. 1 is a basic schematic configuration diagram of an optical coupler and a capping device according to Embodiment 1 of the present invention.
- FIG. 2 shows the first embodiment of the first embodiment of the present invention. It is a figure which shows aberration of a meter lens.
- FIG. 3 is a diagram showing the aberration of the diffraction lens of Example 1 according to Embodiment 1 of the present invention.
- FIG. 4 is a diagram showing the aberration of the comparative lens of the comparative example according to the first embodiment of the present invention.
- FIG. 5 is a diagram showing the aberration of the diffraction lens of the comparative example according to the first embodiment of the present invention.
- FIG. 6 shows an optical pick-up V according to the first embodiment of the present invention.
- FIG. 7 is a schematic configuration diagram of an optical pickup device according to the second embodiment.
- FIG. 8 is a schematic configuration diagram showing a lens device used for optical pickup according to the second embodiment.
- FIG. 9 is a schematic diagram showing the structure of the phase difference plane of the aberration correction element of the lens clothing used for the optical pickup clothing according to the second embodiment.
- FIG. 10 is a graph showing the spherical aberration of the lens apparatus of Numerical Example 2 at a wavelength of 410 nm and a soil of 10 nm.
- FIG. 1 is a schematic configuration diagram of an optical pickup lens device according to an embodiment of the present invention.
- Embodiment 1 is an optical pickup lens device according to the first embodiment.
- Light source 1 and nU lens 3 are optical pickup lens devices according to the first embodiment.
- Light source 1 with an objective lens 5 and an actuator-evening 7 Consists of a semiconductor laser and emits a luminous flux 2 with a wavelength in the range of 390 nm to 420 n
- a light beam 2 emitted from a light source 1 composed of a half laser is converted into a substantially parallel light by a meter lens 3, transmitted through a diffraction lens 4, and is converted by an objective lens 5. Focused on information recording medium 6
- the diffraction lens 4 is attached to the actuator 7 with the objective lens 5 and the optical axis of the diffraction lens 4 almost coincident with each other, whereby the arrow A is perpendicular to the optical axis direction.
- the wavelength changes and the luminous flux diverges and converges, and the spot in the rack's rack direction is corrected, that is, racking is performed.
- the lens 3 is composed of an achromatic tangential lens and is movable in the direction of the optical axis as indicated by the arrow B so as to correct spherical aberration generated in the optical system. Can change the angle of the light beam incident on the objective lens 5, and cancels the spherical aberration caused by the thickness of the information recording medium 6 or each optical element constituting the optical system.
- the optical pickup lens device satisfies the following conditions.
- CAt axial chromatic aberration of all optical systems [m / nm]
- ⁇ f Angular change of ⁇ per unit wavelength of light flux emitted from the J-measuring means [min / nm]
- CAt which is the axial chromatic aberration of all optical systems, is smaller than 0 1 Cm / nm] or larger than 01 [ ⁇ m / nm].
- the axial chromatic aberration CA f of the means is less than 20 [m / nm] ⁇ small ⁇ , the axial chromatic aberration of the aberration correction element c
- the axial chromatic aberration C A m of the aberration correction element is ⁇ 20 [m
- ⁇ No When the axial chromatic aberration CAm of the aberration correction element is larger than 0 a, it is not preferable because the chromatic aberration of the objective lens element cannot be corrected.
- the angular change of ⁇ which is a unit wave of the light beam emitted from the remitter, ⁇ f is as small as 0 25 [min / nm] or 0 • 25 [min / nm] ⁇
- the chromatic aberration of the aberration correction element is 0 and the spot deviation is
- the angle change per unit wavelength of the luminous flux emitted from the aberration correction element is smaller than -075 [min / nm].
- FIG. 6 is a schematic diagram of an optical pick-up garment to which the optical pick-up lens ⁇ according to the first embodiment of the present invention is applied. It is a figure. In FIG. 6, the same components as those in FIG.
- the luminous flux emitted from the light source 1 composed of a semiconductor laser passes through the beam pump 8 and is formed of a meter lens.
- ⁇ Aberration corrector consisting of diffracting lens which becomes almost parallel light
- the focused spot focused on the information recording surface 6 a of the information recording medium 6 The focused spot focused on the information recording surface 6 a
- the reflected laser light is reflected by the picometers with different reflectivity formed on the surface 6a and the reflected laser light is reflected by the objective lens.
- An optical signal from the light receiving element 10 condensed on 10 detects a change in light modulated on the information recording surface 6a based on the electric signal from the light receiving element 10 and only looks at the information recorded on the information recording medium 6.
- the aberration correction element 4 and the objective lens 5 are both attached to the work station 7 and can be moved in the directions indicated by arrows A and A, that is, in the direction orthogonal to the optical axis direction.
- the remote lens 3 is configured to be movable in the direction of the optical axis as shown by the arrow B.
- the U-meter lens is a laminated lens, but a diffraction lens having a color correction function or a single lens having no color correction function.
- the lens may be fc.
- the aberration correction element may be a diffractive lens lens, but may be a contact lens having a chromatic aberration correcting function.
- the diffraction lens is made of resin, it is light in weight, and is therefore advantageous for being moved together with the objective lens in the factory.
- the aberration correction element that is, the diffraction lens and the objective lens have a separate structure, but have a diffractive structure on the ⁇ and-surfaces of the object lens with few ⁇ and-surfaces.
- Example 1 and Comparative Example in which only the design values of one lens 3 and the diffraction lens 4 are compatible, show that the axial chromatic aberration in all optical systems is 1 , 0'S, am 1 nm, etc. But
- Example 3 has three lens lenses, three diffraction lenses, and four objective lenses.
- Table 1 shows the specific numerical configuration of Lens 5 and Table 2 shows the numerical configuration of the comparative example. In each case, the design wavelength is centered at 410 nm. Further, in Example 1 and Comparative Example, it is assumed that a parallel beam is incident on the diffraction lens 4.
- the diameter of the parallel beam on the exit side was set to 2.21 mm.
- Surface numbers 1 to 4 are collimation lenses 3
- surface numbers 5 to 8 are diffraction lenses 4
- surface numbers 9 and 10 are objective lenses 5
- Reference numeral 2 denotes a protective layer of the information recording medium 6 which is a medium.
- r is the radius of curvature of each lens surface (however, the information recording medium is the protective layer surface)
- d is the lens thickness
- n is the refractive index of each lens at the wavelength ⁇ nm
- V is each lens. It is the hottest number of The phase grating formed on the diffractive surface was expressed by the ultra-high refractive index method (for the ultra-high refractive index method, see William C. Sweatt: Describing holographic optical elements as lenses: Journal Optical Society of America). , Vol. 6 7, No. 6, June ⁇
- FIG. 2 shows aberrations of the lens 3 of the first embodiment.
- FIG. 3 shows the aberration of the diffraction lens 4 which is the aberration correcting element of Example 1.
- FIG. 3 (a) shows the spherical aberration S A.
- Fig. 4 shows the aberration of the lens h3 of the comparative example.
- Table 3 shows each of Example 1 and Comparative Example. ⁇ U-meter lens 3 Diffraction lens 4 Objective lens 5 Focusing distance, ⁇ Distance Effective axial chromatic aberration On-axis chromatic aberration in all-optical system Table 3
- FIG. 4 shows the variation of the emission angle per unit light source wavelength for each of the comparative lens of Example 1 and the meteorological lens, the diffraction lens, and ⁇ 1.
- the wavelength of the light source changes.
- Each This shows the change amount of the light beam emission angle.
- D 1 which indicates the amount of spot displacement in the rack direction per unit change in the light source wavelength
- D 1 is the objective lens 5 and the diffraction lens 4 in Example 1 in the body.
- Light source wavelength change when shifted by 150 m in the rack direction 1 V in the rack direction of the information recording medium 6 in the focus of 1 nm per 1 nm D 2 indicates the position of the comparative example ⁇
- Example 1 the n remote lens 3 has sufficient chromatic aberration correction, and the diffractive lens 4 has a large amount of chromatic aberration correction.
- the above three lens 3 is sufficiently color-corrected. (It is desirable that the color is not sufficiently corrected.
- the light diverges and converges with respect to the wavelength change, and this angle change is reflected in the spot when the objective lens 5 is shifted.
- the amount of change in the emitted luminous flux angle per unit wavelength change of the light source is large, that is, when the wavelength change of the light source occurs.
- the angle between the divergence and convergence of the emitted light beam becomes large, and the diffraction lens 4 and the objective lens 5, which are aberration correction elements, are always shifted coaxially, and the movable part is moved off-axis. Since light is incident, the movement amount of the spot at the focal point in the track direction becomes large.
- large axial chromatic aberration can be corrected in response to a sharp wavelength fluctuation of a light source in a short wavelength range.
- the optical axis shifts in the rack direction of the information storage medium due to the hooking of the objective lens, even if the wavelength shift occurs, the focus in the focus occupation can be reduced. Suppress the movement of the information recording medium in the track in the track direction (the _ is possible, i.e., a large axial chromatic aberration correction and a large lateral chromatic aberration correction).
- the comparative example has the same axial chromatic aberration correction ⁇ , but the chromatic aberration of magnification is small.
- the chromatic aberration correction areas of the U-meter and the aberration correction element are appropriately distributed.
- the wavelength of the light source fluctuated rapidly when the objective lens was shifted from the optical axis due to tracking. ⁇ Not only in the axial direction but also in the ⁇ Therefore, the lens device for the optical pick-up V according to the first embodiment reduces the risk of off-tracking. That is, the lens device for the optical pick-up V according to the first embodiment corrects large axial chromatic aberration generated in the objective lens due to the wavelength range ft aperture number NA. It is possible to reduce the amount of spot displacement, which is chromatic aberration of magnification.
- a lens apparatus for an optical pickup apparatus will be described below.
- a conventional technique for correcting chromatic aberration in a lens apparatus of an optical pickup V apparatus refer to Japanese Patent Application Publication No. 7-294974 and Japanese Patent Application Laid-Open No. Hei 11-337881 utilize a diffraction lens Is having a large number of concentrically formed annular zones.
- Japanese Patent Application Laid-Open No. 11-33 718 18 are based on the injection molding method using a resin material to form the diffraction lens structure on the objective lens at low cost. It is planned to manufacture in
- the objective lens described in Japanese Unexamined Patent Publication No. Hei 7-294704 is assumed to be used for a luminous flux having a wavelength of 780 nm.
- Japanese Patent Application Laid-Open No. 7-294 707 specifies that the objective lens described in Japanese Patent Application Publication No. 7-1818 is used for a light beam having a reference wavelength of 65 0 ⁇ m.
- the objective lens described in the official gazette and Japanese Patent Application Laid-Open No. H11-1337818 was used for a luminous flux having a wavelength in a wavelength range where the base m wavelength was less than 420 nm. In order to obtain a sufficient chromatic aberration correction effect, the number of annular zones required is large, and -tt
- the objective lens described in Japanese Patent No. 294707 and Japanese Patent Application Laid-Open No. 11-37881 is used to reduce the luminous flux of a short wavelength region having a reference wavelength of 420 nm or less. It is difficult to manufacture the O objective lens used for ex-measurement, and it was only possible to use an objective lens with a large loss of light based on the shape error.
- a high-performance lens for optical pick-ups that is easy to manufacture and is used for luminous fluxes in the wavelength region of 20 nm or less, and aberration correction used for the lens.
- Another major feature of Embodiment 2 is to provide an optical pickup device having the above-described lens device.
- An aberration correction element that transmits an incident light beam. It includes a plurality of annular zones defined by II circles centered on the optical axis of the luminous flux and located at a different position from the plane, and includes a phase step formed at the boundary between the zones.
- the phase step is a difference that produces a phase between the light fluxes that pass through mutually different regions, which is twice as large as the 2 ⁇ run with respect to the reference wave.
- the aberration correction element according to Embodiment 2 Since the aberration correction element according to Embodiment 2 has the above configuration, it does not generate spherical aberration with respect to the luminous flux of the reference wavelength and does not generate spherical aberration with respect to the luminous flux of the wavelength deviated from the reference wavelength. Provide the element that generates the aberration. By combining the surface aberration with the spherical aberration of the diffraction surface, it is possible to form a large number of zones on the diffraction surface.
- the phase difference generates a phase difference of 2 ⁇ Lan with respect to the reference wavelength between light beams transmitted through mutually different regions.
- the aberration correction element according to Embodiment 2 has the above configuration. , Which causes high-order aberrations. ⁇ Especially, it is possible to correct only the third-order spherical aberration.
- the aberration correction element according to the second embodiment has the above-described configuration.
- the objective lens of A generates spherical aberration that increases drastically as it moves away from the optical axis.
- the phase step surface is an aspheric surface defined by a different aspherical definition formula for the optical surface of each region.
- the aberration correction element according to the embodiment 2 is the best for each region. Since the aberration correction element composed of different aspherical surfaces has the above-mentioned configuration, it is necessary to configure it with an optimally different aspherical surface for each region. When the aberration correction element is used alone,
- the aberration-correcting element includes a lens element including a diffractive surface and a lens element including a phase-difference surface-For example, the aberration-correcting element forms a diffractive surface on one side and a phase on the other side.
- the aberration compensating element according to the embodiment 2 consisting of a single lens element forming a difference surface has the above-described structure. Facilitates molding and assembly during fabrication, and does not generate inter-surface reflections occurring at the interface
- One of the above-mentioned giants is as follows. ⁇ Achieved by a lens device, the light beam emitted from the light source is condensed on an optical information recording medium to form a spot.
- a lens device used for an optical pickup device that performs a small amount of erasing, from the light source side to the optical information recording medium side.
- an objective lens system that forms a spot by condensing the light flux emitted from the aberration correction element on an information recording medium in order to transmit the light flux emitted from the light source.
- the aberration correcting element is arranged at a position different from the diffraction surface having a beam that deflects the light beam by diffraction, and is a ring m-shaped complex defined by a concentric circle centered on the optical axis of the light beam. And a phase step plane including a phase step formed at the boundary between the areas. The phase step generates a phase difference between light beams transmitted through mutually different regions, which is a multiple of 2 ⁇ radians with respect to the reference wavelength.
- the lens device according to Embodiment 2 has the above configuration, the solid-state laser and the rack used for the light source are large and the oscillation wavelength is changed by increasing the size. Therefore, even if the oscillation wavelength is different from the reference wavelength, the light beam can be focused on the optical information recording medium and a spot can be formed satisfactorily.
- Preferable ⁇ is used for a light beam having a reference wavelength of 420 nm or less, and ⁇ preferred is used for a light beam having a wavelength in a range of several nm with respect to the reference wavelength.
- Be Light '(Bonho recording medium emits a light beam to form a spot)
- the information is extracted. • 'Inserts.' • At least one of the erasures is performed by a light-capturing device, and a light source that emits a light beam; A light condensing part that condenses the light emitted from the light source to form spots on the optical information recording medium, and a light reflected from the optical information recording medium, and the light from the light source to the light condensing part And a light receiving unit that receives the light beam separated by the separating unit.
- the light collecting unit includes an aberration correction element that transmits the light beam emitted from the light source, A lens device having an objective lens system that forms a spot by condensing a light beam emitted from the aberration correction element onto an information recording medium, and the aberration correction element deflects the light beam by diffraction.
- the diffractive surface which is located at a position different from the diffractive surface, A phase step surface including a plurality of annular zones defined by concentric circles at the center and a phase step formed at a boundary portion between the areas, wherein the phase steps are different from each other.
- the optical pickup device which produces a phase between the transmitted light flux and the reference wave, which is an integral multiple of 2 ⁇ radians, has the above configuration. Therefore, the semiconductor laser used for the light source is too large, the rack is large, or the oscillation wavelength has changed due to a change in the wording. However, even if information is recorded on the optical information recording medium as well as erasing the optical information recording medium, the information cannot be erased from the optical information recording medium. Information has been read from the recording medium.
- a lens for an optical pick-up that is easy to manufacture and has high performance even when used for a luminous flux of a wavelength region where the 2P wave is less than 420 nm. It is possible to provide a device and an aberration correction element used for the lens device. According to the second embodiment, when an optical pickup device provided with the above-described lens device is provided. In the following embodiment, we will explain the process for m2 with reference to the drawings.
- Fig. 7 is a schematic configuration diagram of the optical pick-up device according to the embodiment 2
- Reference numeral 0 denotes a light source section LS including a light source section LS, a condensing section C ⁇ , a separation section SP, and a light receiving section RE.
- the light source section LS includes a semiconductor laser 26 and has a reference wavelength of 410 nm.
- the condensing part C ⁇ ⁇ that emits a certain laser beam is a three-meter lens.
- U lens 24 consisting of 4 and lens unit 21 1 is formed by attaching two lens elements to each other.
- the structure of the lens device 21 including the element 22 and the objective lens 23 will be described in detail later.
- a beam splitter 25 consisting of 5 is formed by contacting two right-angled isosceles-a prismatic shape with a rectangular bottom surface-with each other. It has an optical film that has the function of transmitting some of the luminous flux while reflecting the rest.
- the light receiving section RE is a pho- to-optical element that includes a detection lens 27 and a light-receiving element 28, and the optical element 28 that converts an incident light beam into an electric signal that is strongly adapted.
- Objective lens
- the optical recording medium 9 is an information recording surface 2 on which a light beam is focused.
- the luminous flux emitted from the semiconductor laser 26 passes through the beam pump V 25, and is transmitted by the U lens 24 composed of the entrance lens.
- the light beam which has been converted into substantially parallel light and has become substantially parallel light passes through the aberration correction element 22, and is swept onto the information recording surface 29 a of the information recording medium 29 by the objective lens 23. Focused as Poh
- the light beam condensed as the spot Vh is formed on the information recording surface 29a which is reflected by the pits having different reflectances formed on the information recording surface 29a.
- the light beam reflected by the pits passes through the objective lens 23, the aberration correction element 22 and the U-meter lens 24 in this order, and reaches the beam spot U-5.
- the light is reflected by the beam lens 25 and transmitted through the detection lens 27, and further, the light beam is arranged at a light condensing position arranged by the detection lens 27.
- a spot is formed on the light receiving surface of the element 28.
- the light receiving element 28 is a light pick-up that converts a change in the luminous flux of the light beam modulated by the information recording surface 29a into an electric signal.
- the storage device removes the distance stored in the optical information recording medium by an electric signal output from the light receiving element 28.
- FIG. 8 is a schematic diagram showing a lens device used for the optical pick-up device according to the second embodiment.
- Reference numeral 22 denotes a lens which includes a diffraction surface S 1 and a phase step surface S 3 in order from the light source side, and is made of resin.
- the objective lens 23 has a refractive surface S 1 on the light source side. 4 and the refraction surface S5 on the optical information recording medium side
- the diffractive surface S 1 functions as a positive optical surface that generates and converges diffracted light from incident light incident on the ⁇ surface.
- phase difference surface S 3 functions as a negative surface for the diffracted light, and the positive and absolute values of the diffractive surface S 1 are equal to each other.
- Reference numeral 2 2 denotes a non-puffer for the light beam of the reference wavelength, and the parallel light beam is emitted as ⁇ and a parallel light beam.
- FIG. 9 is a schematic diagram showing the structure of the phase difference plane of the aberration correction element of the lens device used for optical pickup according to the second embodiment.
- S 3 includes a plurality of annular zones defined by a center circle centered on the optical axis of the light beam, and a phase step formed at a boundary between the zones.
- the center including the optical axis is defined as region 1, and the radius of region 1 is defined as H1.
- the W-shaped region formed from the optical axis toward the periphery is defined as the region from the optical axis side in order. 2
- region 3 • • • region n the outside diameter of region 2 is H 2
- the outside diameter of region 3 is H 3
- the outside diameter of the region n is ⁇ n
- the magnitude of the difference between the region 1 and the region 2 in the direction along the optical axis is A 1
- the step between the region 2 and the region 3 is A2 is the size along the optical axis of
- the size along the optical axis of the step between the area n-1 and the area n is A n
- the aberration correction element 22 used in the lens device according to the second embodiment has five annular zones.
- the boundary between each region is an integral multiple of ⁇ 0 / (n 0 — 1) (here,
- Is configured so that the size in the direction along the optical axis increases only by ⁇ .
- the phase difference between two different light beams transmitted through the phase step surface S 3 is 2 V radians.
- the phase difference surface S 3 does not change the spherical aberration of the transmitted light beam, and the objective lens 23 has been corrected for aberration with respect to the reference wavelength.
- the oscillation wavelength of the semiconductor laser 26 deviated from the reference wavelength be ⁇
- the refractive index of the resin material with respect to the wavelength be n 1.
- the spherical aberration that occurs on the phase step surface S 3 is the phase step It was possible to adjust the radius of each area formed on the surface S 3 depending on how the optical system was effectively used and how the surface shape of each area was adjusted. As a result, the tendency of the spherical aberration generated on the n-diffractive surface S 1 and the spherical aberration generated on the phase step surface S 3, in which the wavelength of the light beam oscillated by the semiconductor laser 26 is shifted from the reference wavelength by several nm, is in the same direction.
- spherical aberration is generated only on the diffractive surface S 1 by measuring in a direction opposite to that of the spherical aberration generated by the object lens 23, and by measuring the spherical aberration. It is not possible to form a large number of ring zones in the periphery of the diffraction surface S 1 like ⁇ , and the width of the ring may not be small.
- ⁇ Aberration correction element 22 alone has large aberration When spherical aberration is canceled between the aberration correction element 22 and the objective lens 23, it becomes possible to generate In order to correct the substantial image occupation position on the optical axis, and to correct axial chromatic aberration, it is possible to make both surfaces of the aberration correction element 22 diffractive surfaces.
- the aberration corrector 22 is a diffraction surface and the other is a phase step surface as in the lens device according to the embodiment.
- the magnitude of the step between the regions formed on the phase step surface S 3 in the direction along the optical axis is equal to the base that transmits the regions.
- PX is set so that a phase difference of 2 radians is produced between the light beams of the 2p wave
- the integer value of J is appropriately determined according to the required characteristics.
- the depth of the step must be increased and the phase difference must be increased in order to obtain a large amount of aberration correction.
- the depth of the phase step is reduced If only the third-order spherical aberration is to be corrected ⁇ , the depth of the phase difference should be the minimum necessary. It is more desirable to set to a village equivalent to
- the aberration corrector 22 described in the second embodiment is a lens element in which a diffraction surface S 1 and a phase step surface S 3 are physically formed, but is not limited thereto.
- the combination of a lens element having only a diffractive surface and a lens element having only a phase step surface may be used.
- the aberration correction element 22 is constituted by a single lens element formed of a body.
- the aberration correction element 22 and the objective lens 23 be configured so as to be held physically, and to be able to be moved physically by the function.
- the aberration correction element 22 forms an objective lens with a single lens element, in which it is desirable that the width of each region in the direction orthogonal to the optical axis decreases as the distance from the optical axis increases.
- NA 0 8 The spherical aberration generated at ⁇ m from the ⁇ 2 wave field used in the quotient A is sharply increased as the distance from the optical axis is increased in the direction perpendicular to the optical axis.
- the retardation surface is defined by a single aspherical definition formula, which is defined by a single aspherical definition formula, where the optical surfaces in each region are in contact with a phase step. Either may be used as an aspheric surface, but it is preferable to use a different aspheric surface defined by a different aspheric definition formula.Each region is suitable for each region.
- a spherical aberration compensating element composed of a spherical surface corrects spherical aberration at a reference wavelength with a single compensating element compared with an aberration compensating element in which each region is defined by a single aspherical definition formula.
- the aberration correction element in which each region is defined by one aspherical definition formula has a different thickness in the optical axis direction in each region. Or each region generates a component.
- Aberration correction elements composed of optimally different aspherical surfaces for each region can be designed so that spherical aberration and power components do not occur in each region. Can be improved
- the aberration correction element 22 is most effective for the aperture of the semiconductor laser 26 whose reference wavelength is less than 420 nm. O In general, glass etc. is used in the short wavelength region where the wavelength is less than 420 nm.
- the aberration correction element 22 can be used as a diffraction surface S 1 or a phase step surface S 3 The i
- ⁇ Lens elements used in optical systems other than the objective lens e.g., a lens 24 or an information recording surface
- the objective lens e.g., a lens 24 or an information recording surface
- the aberration correction element 22 is also assumed to be +1 order as the order of diffraction to be measured, but any of the m-th order (m integer) may be used in 3 ⁇ 4.
- the lens device of the embodiment The objective lens 2 was described as being a single lens in the above, but may be shown because it is composed of multiple lenses.
- the aberration correction element 2 In the lens device of Embodiment 2, the aberration correction element 2
- the collimated light beam is incident on 2, but it may be a non-parallel light beam.
- the difference between the difference corrector 22 and the objective lens 23 is a parallel light beam, it is a non-parallel light beam.
- the aberration correction element 22 has a diffractive surface on the light source side and a phase stage on the optical information recording medium side.
- the difference plane is arranged, conversely, the phase difference plane may be arranged on the light source side, and the diffraction plane may be arranged on the optical recording medium side.
- the aberration correction element according to the embodiment 2 does not generate spherical aberration with respect to the light beam having the reference wavelength, and does not generate spherical aberration with respect to the light beam having a wavelength deviated from the reference wavelength.
- the spherical aberration of the diffractive surface is made to cooperate with the spherical aberration of the diffractive surface, the number of orbicular zones of the diffractive surface cannot be formed. It is possible to produce a desired large spherical aberration, which is small, and it is also possible to easily produce a correction compensator, which is related to the performance of the embodiment, by using resin.
- the solid-state black of the semiconductor laser used for the light source becomes large.
- the oscillation wavelength When the oscillation wavelength is changed by the change in J, the oscillation wavelength is not the reference wavelength, and the light beam is focused on the optical information recording medium to form a good spot. If a further lens is used for the optical pump, the semiconductor laser used for the light source will oscillate due to large changes in the solid-state laser and the laser diode. The information was recorded on the optical information recording medium satisfactorily, because the oscillation wavelength deviated from the reference wavelength due to a change in the wavelength and could not produce a tra V-Kingella.
- Information erased from optical information recording medium Reads information from optical information recording media
- the aberration corrector 22 was designed with a design wavelength of 410 nm as a reference wavelength.
- the light beam was a parallel light beam incident on the aberration correction element 22, and the diameter of the parallel light beam on the exit side was 2.21 mm on the incident surface of the objective lens 23.
- the phase grating formed on the diffraction surface was expressed by the ultra-high refractive index method.
- Table 6 shows the numerical data of the lens device and the optical information recording medium of Numerical Example 2.
- rj is the radius of curvature of the j-th surface
- dj is the j-th spacing between the upper surfaces of the axes
- n 410 is the refractive index of the medium for a wavelength of 410 nm
- r is the Abbe number. Respectively.
- the surface on the light source side of the aberration correction element 22 is a diffraction surface S 1, and the surface on the emission side, that is, the surface on the objective lens 23 side is a phase step surface S 3.
- the absolute value of the diffraction plane of the diffraction surface S 1 on the light source side of the aberration correction element 22 and the phase difference surface S 3 of the objective lens side are corrected.
- the refractive index is set to be negative, and the absolute values of the respective components are set to be the same.
- the value of the absolute value 7 of the aberration correction element 22 is set to 0.
- the first-order diffracted light is used. Are designed to have the maximum amount of diffraction
- Table 7 shows numerical values indicating the aspheric coefficients of the third surface S3, the fourth surface S4, and the fifth surface S5 (see Table 6) of Numerical Example 2.
- the third surface S 3 is a surface defined by a single aspherical definition when connected by a phase step.
- Table 8 shows the aberration correction element 2
- Figure 2 shows the numerical value of the retardation surface S 3 formed.
- Table 7 shows the numerical value of the retardation surface S 3 formed.
- the difference surface S 3 is a region from the optical axis P.
- the step between region 2 and region 3, the step between region 3 and region 4, and the step between region 4 and region 5 all have a wavelength of 410 nm.
- Fig. 10 is a graph showing the spherical aberration of the lens apparatus of Numerical Example 2 at a wavelength of 410 nm and a soil of 10 ⁇ m.
- the horizontal axis represents the length in the optical axis direction.
- the vertical axis represents the occupation of the parallel light beam incident on the aberration compensating element 22.
- the axial chromatic aberration is As can be seen from Fig. 10, which corresponds to the on-axis spacing in the curve of Fig. 10, the lens device of Numerical Example 2 has a focal point in the optical axis direction regardless of the wavelength. , And the displacement has hardly moved
- the lens system in Example 2 was the same as the lens system except for the occupation without the phase difference.
- the lens power generated by focusing the objective lens of the lens device in Numerical Example 2 is approximately 4 m ⁇ per wavelength change of 1 nm near 410 nm.
- the amount of shift in the optical axis direction due to the change in wavelength is reduced by 1 ⁇ m.
- the chromatic aberration correction is increased by providing a phase step.
- Numerical Example 3 has the same configuration as Numerical Example 2 except for the phase step, as shown in Table 9, for the wavelength of 410 nm.
- the depth of the step was also determined to give a phase difference of 2 ⁇ multiples, so numerical value In Example 3, the depth of each step is not uniform. Table 9
- Objective lens 3 has an NA of 0.8 or more, and the amount of spherical aberration that occurs when it deviates from the fundamental wave by several nm increases sharply according to the vicinity.
- the amount of spherical aberration generated to correct axial chromatic aberration must be increased according to ⁇
- the lens device using the aberration correction element 6 of Numerical Example 3 was used except that the occupation without the phase difference was used.All other conditions were compared with the same lens device (Comparative Example).
- the objective lens occupancy of the device according to Example 3 is 4
- the wavelength has been reduced by about 27 m ⁇ per 1 nm, and the shift in the optical axis direction of the light beam direction has changed by 1 ⁇ m due to the wavelength change.
- the present invention relates to CD-R ⁇ M • CD-R • CD-RW • DV
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/535,339 US7068445B2 (en) | 2003-07-11 | 2004-07-09 | Optical pickup lens device and information recording and reproducing device using the same |
US11/385,829 US7221521B2 (en) | 2003-07-11 | 2006-03-22 | Optical pickup lens device and information recording and reproducing device using the same |
US11/385,765 US7248420B2 (en) | 2003-07-11 | 2006-03-22 | Optical pickup lens device and information recording and reproducing device using the same |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003-195582 | 2003-07-11 | ||
JP2003195582 | 2003-07-11 | ||
JP2004-137594 | 2004-05-06 | ||
JP2004137594A JP2005322281A (ja) | 2004-05-06 | 2004-05-06 | 収差補正素子、光ピックアップ用レンズ装置、光ピックアップ装置 |
Related Child Applications (4)
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US10/535,339 A-371-Of-International US7068445B2 (en) | 2003-07-11 | 2004-07-09 | Optical pickup lens device and information recording and reproducing device using the same |
US10535339 A-371-Of-International | 2004-07-09 | ||
US11/385,765 Division US7248420B2 (en) | 2003-07-11 | 2006-03-22 | Optical pickup lens device and information recording and reproducing device using the same |
US11/385,829 Division US7221521B2 (en) | 2003-07-11 | 2006-03-22 | Optical pickup lens device and information recording and reproducing device using the same |
Publications (1)
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WO2005006321A1 true WO2005006321A1 (ja) | 2005-01-20 |
Family
ID=34067337
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PCT/JP2004/010159 WO2005006321A1 (ja) | 2003-07-11 | 2004-07-09 | 光ピックアップ用レンズ装置及びそれを用いた情報記録再生装置 |
Country Status (3)
Country | Link |
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US (3) | US7068445B2 (ja) |
KR (1) | KR20060037234A (ja) |
WO (1) | WO2005006321A1 (ja) |
Cited By (2)
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WO2016086095A1 (en) | 2014-11-25 | 2016-06-02 | Biodelivery Sciences International, Inc. | Patches, methods for forming and testing pharmaceutical agent delivery patches |
EP3566692A1 (en) | 2006-07-21 | 2019-11-13 | BioDelivery Sciences International, Inc. | Transmucosal delivery devices with enhanced uptake |
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JP4880686B2 (ja) * | 2006-06-20 | 2012-02-22 | パナソニック株式会社 | カップリングレンズ、光学ヘッドおよび光ディスク装置 |
US8045426B2 (en) * | 2007-06-05 | 2011-10-25 | Panasonic Corporation | Optical head device, and recording and/or reproducing device |
JP5143031B2 (ja) * | 2008-01-22 | 2013-02-13 | パナソニック株式会社 | 光ディスクドライブ、光ディスクシステム、光ディスクシステムを搭載した移動体、プログラム、及び記録媒体 |
US7966451B2 (en) * | 2008-02-05 | 2011-06-21 | International Business Machines Corporation | Power conservation in a composite array of data storage devices |
JP2010134974A (ja) * | 2008-12-02 | 2010-06-17 | Panasonic Corp | 光ピックアップ装置および光ピックアップ用レンズ |
US8351036B1 (en) | 2009-03-26 | 2013-01-08 | J. A. Woollam Co., Inc. | System for naturally adjusting the cross-sectional area of a beam of electromagnetic radiation entered to a focusing means |
US20110002117A1 (en) * | 2009-06-16 | 2011-01-06 | Panasonic Corporation | Optical disc drive |
US8938170B2 (en) * | 2010-07-01 | 2015-01-20 | Analysis First LLC | Handheld identification and communication systems |
US10018815B1 (en) | 2014-06-06 | 2018-07-10 | J.A. Woolam Co., Inc. | Beam focusing and reflective optics |
US10338362B1 (en) | 2014-06-06 | 2019-07-02 | J.A. Woollam Co., Inc. | Beam focusing and reflecting optics with enhanced detector system |
US9921395B1 (en) | 2015-06-09 | 2018-03-20 | J.A. Woollam Co., Inc. | Beam focusing and beam collecting optics with wavelength dependent filter element adjustment of beam area |
US10209528B1 (en) | 2015-06-09 | 2019-02-19 | J.A. Woollam Co., Inc. | Operation of an electromagnetic radiation focusing element |
CN112119336B (zh) | 2018-05-14 | 2022-06-07 | 夏普株式会社 | 双透镜光学系统、光束合成模块、投影仪、以及双透镜光学系统的组装方法 |
CN112683487A (zh) * | 2020-12-11 | 2021-04-20 | 中国人民解放军国防科技大学 | 一种保形侧窗结构集成式纹影仪 |
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- 2004-07-09 KR KR1020057010255A patent/KR20060037234A/ko not_active Application Discontinuation
- 2004-07-09 US US10/535,339 patent/US7068445B2/en active Active
-
2006
- 2006-03-22 US US11/385,765 patent/US7248420B2/en active Active
- 2006-03-22 US US11/385,829 patent/US7221521B2/en active Active
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WO2016086095A1 (en) | 2014-11-25 | 2016-06-02 | Biodelivery Sciences International, Inc. | Patches, methods for forming and testing pharmaceutical agent delivery patches |
Also Published As
Publication number | Publication date |
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US20060164735A1 (en) | 2006-07-27 |
US7068445B2 (en) | 2006-06-27 |
US7248420B2 (en) | 2007-07-24 |
US20060164734A1 (en) | 2006-07-27 |
KR20060037234A (ko) | 2006-05-03 |
US7221521B2 (en) | 2007-05-22 |
US20050280907A1 (en) | 2005-12-22 |
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