WO2013094210A1 - 検出レンズ、レンズユニット、光ピックアップ装置、光ディスク装置、コンピュータ、光ディスクプレーヤ及び光ディスクレコーダ - Google Patents
検出レンズ、レンズユニット、光ピックアップ装置、光ディスク装置、コンピュータ、光ディスクプレーヤ及び光ディスクレコーダ Download PDFInfo
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- WO2013094210A1 WO2013094210A1 PCT/JP2012/008171 JP2012008171W WO2013094210A1 WO 2013094210 A1 WO2013094210 A1 WO 2013094210A1 JP 2012008171 W JP2012008171 W JP 2012008171W WO 2013094210 A1 WO2013094210 A1 WO 2013094210A1
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- WIPO (PCT)
- Prior art keywords
- lens
- optical
- protrusion
- axis
- optical disc
- Prior art date
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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
- G11B7/1378—Separate aberration correction lenses; Cylindrical lenses to generate astigmatism; Beam expanders
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
-
- 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
-
- 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
- G11B7/22—Apparatus or processes for the manufacture of optical heads, e.g. assembly
Definitions
- the present invention relates to a technology of an information processing apparatus that performs information processing using light.
- a BD has the same size as a CD (Compact Disc) or DVD, but can accumulate information at a higher density than a CD or DVD, and thus has a large capacity.
- BD is an optical disc having a protective substrate having a thickness of about 0.1 mm.
- NA numerical aperture
- the information recording surfaces of a plurality of optical discs having different protective substrate thicknesses are converged with light beams having different wavelengths using a single objective lens or a plurality of objective lenses to record or reproduce information.
- a light up device that performs and is compatible has been proposed.
- Japanese Patent Application Laid-Open No. 2011-108350 discloses a lens fixing device having a lens holder and a mounting portion on which the lens holder is mounted.
- FIG. 21 is a schematic front view of the lens holder 900 disclosed in Patent Document 1.
- FIG. A conventional lens holder 900 will be described with reference to FIG.
- the lens holder 900 includes a base 910 in which a lens region 901 is formed, a first protrusion 920 that protrudes from the base 910, and a second protrusion 930 that protrudes from the base 910 in the same manner as the first protrusion 920. .
- the lens holder 900 including the lens region 901 is integrally molded by a resin molding technique.
- the first protrusion 920 includes a guide surface 921 inclined with respect to the y-axis and an adhesive surface 922 on the x-axis.
- the second protrusion 930 includes a guide surface 931 inclined with respect to the y-axis and an adhesive surface 932 on the x-axis.
- the extended surfaces of the guide surfaces 921 and 931 and the adhesive surfaces 922 and 932 intersect on the optical axis OA of the lens region 901.
- a mounting portion (not shown) to which the lens holder 900 is mounted includes a receiving surface with which the guide surfaces 921 and 931 come into contact.
- the lens holder 900 is positioned in the XY plane.
- the lens holder 900 can determine the rotation direction around the optical axis of the lens region 901 in a certain direction. According to Patent Document 1, the shape of the lens holder 900 simplifies the work for fixing the lens, and hardly causes a shift of the optical axis of the lens due to a temperature change.
- Japanese Patent Laid-Open No. 2003-156601 discloses another technique related to lens positioning. Note that the small optical lens disclosed in Patent Document 2 is not applied to an optical pickup device.
- FIGS. 22A and 22B are schematic front views of the lenses 940 and 950 disclosed in Patent Document 2.
- FIG. Conventional lenses 940 and 950 will be described with reference to FIGS. 22A and 22B.
- a lens 940 shown in FIG. 22A includes a lens portion 941 and a rectangular flange 942 surrounding the lens portion 941.
- the flange 942 includes a left surface 943 located on the left side of the lens portion 941 and a right surface 944 located on the right side of the lens portion 941.
- a lens 950 shown in FIG. 22B includes a lens portion 951 and a hexagonal flange 952 surrounding the lens portion 951.
- the flange 952 includes a left surface 953 positioned to the left of the lens unit 951 and a right surface 954 positioned to the right of the lens unit 951.
- Both the lenses 940 and 950 have flanges 942 and 952 having polygonal outlines.
- the left surfaces 943 and 953 and the right surfaces 944 and 954 are flat and longer than the diameters of the lens portions 941 and 951.
- the shape features of the flanges 942 and 952 facilitate mounting and positioning of the lenses 940 and 950 on a holder such as a lens barrel, for example.
- the flat left surfaces 943 and 953 and the flat right surfaces 944 and 954 are used for preventing rotation of the lens portions 941 and 951 with respect to the holder when the lenses 940 and 950 are mounted on a holder such as a lens barrel, for example.
- Japanese Patent Laid-Open No. 2003-121716 discloses another technique related to lens positioning.
- FIG. 23A is a schematic front view and a schematic side view of a lens 960 disclosed in Patent Document 3.
- FIG. 23B is a schematic front view and a schematic side view of a lens 970 disclosed in Patent Document 3.
- the lenses 960 and 970 will be described with reference to FIGS. 23A and 23B.
- a lens 960 shown in FIG. 23A includes a lens portion 961 and a flange 962 surrounding the lens portion 961.
- the flange 962 is formed by cutting out a portion of a circular flange material surrounding the lens portion 961. Accordingly, the flange 962 includes an arcuate contour portion 963 and a linear contour portion 964.
- the outer contour of the flange 962 is generally D-shaped.
- the 23B includes a lens portion 971 and a flange 972 surrounding the lens portion 971.
- the flange 972 is formed by partially cutting a circular flange material surrounding the lens portion 971 in the thickness direction. Accordingly, the flange 972 includes an arcuate contour portion 973 and a linear contour portion 974.
- the flange 972 partially has a D-shaped contour.
- the shape of the flanges 962 and 972 shown in FIGS. 23A and 23B contributes to an improvement in positioning accuracy and a degree of freedom in positioning.
- the flanges 962, 972 allow positioning in the rotational direction, so the shape of the flanges 962, 972 is beneficial when rotational positioning is required.
- Japanese Patent Application Laid-Open No. 2009-266264 discloses an optical pickup device.
- the optical pickup device of Patent Document 4 discloses a lens holder that holds a detection lens and an optical base that receives the lens holder.
- the lens holder includes a main body portion that holds the lens and an overhang portion that is formed at a position deviated in one direction from the center of the detection lens.
- the projecting part projects from the main body part in a direction perpendicular to the optical axis direction of the detection lens.
- the projecting portion is formed with a contact portion that makes line contact with the receiving surface of the optical base.
- the receiving surface and the contact portion can be in line contact in a direction parallel to the optical axis.
- the technique of Patent Document 4 makes it possible to accurately adjust the position of the detection lens.
- the lens holder needs to have a clearance for insertion of the lens.
- the lens is bonded to a lens holder.
- the clearance worsens the position stability.
- a process for attaching the lens to the lens holder is required.
- the shape of the lens disclosed in Patent Document 2 does not contribute to determining the rotation direction of the lens around the optical axis in one direction.
- the shape of the lens disclosed in Patent Document 3 makes it possible to determine the rotation direction of the lens around the optical axis in one direction.
- the visibility of the notch is deteriorated. Since the notch is small, even if the operator inserts the lens in the wrong direction, the operator is less likely to notice a work mistake.
- the present invention relates to a technology that enables an easy and accurate assembly work of a lens.
- a detection lens includes a lens portion, a first surface to which the lens portion is connected, and a flange portion including a second surface opposite to the first surface.
- the flange portion includes a base portion disposed along the optical axis of the lens portion, a first projecting portion projecting along a first axis perpendicular to the optical axis, and the first projecting portion A second projecting portion projecting from the base portion under a point-symmetrical relationship around the optical axis, a third projecting portion projecting along the second axis perpendicular to the optical axis and the first axis,
- the third protrusion includes a fourth protrusion that protrudes from the base under a point-symmetrical relationship around the optical axis.
- the flange portion does not have a portion protruding beyond the second surface.
- the first protrusion includes a first intersecting surface that intersects the first axis.
- the second protrusion includes a second intersecting surface that intersects the first axis, and the third protrusion includes a third intersecting surface that intersects the second axis.
- the fourth protrusion includes a fourth intersecting surface that intersects the second axis. The first distance between the first intersection plane and the second intersection plane is longer than the second distance between the third intersection plane and the fourth intersection plane.
- the present invention makes it possible to easily and accurately perform the assembling work of the lens.
- FIG. 1 is a schematic perspective view of an exemplary optical pickup device. It is a schematic front view of the detection lens used for the optical pick-up apparatus shown by FIG.
- FIG. 2B is a schematic side view of the detection lens shown in FIG. 2A. It is a schematic plan view of a lens holder that holds the detection lens shown in FIGS. 2A and 2B.
- FIG. 3B is a schematic front view of the lens holder shown in FIG. 3A. It is a schematic plan view of the lens unit of 1st Embodiment.
- FIG. 4B is a schematic front view of the lens unit shown in FIG. 4A.
- FIG. 5A is a schematic cross-sectional view of the lens unit along the line BB shown in FIG. 4B.
- FIG. 4B is a schematic cross-sectional view of the lens unit along the line AA shown in FIG. 4A.
- FIG. 3B is a schematic plan view of the lens holder shown in FIG. 3A. It is a schematic top view of the lens unit of 2nd Embodiment.
- FIG. 7B is a schematic front view of the lens unit shown in FIG. 7A.
- FIG. 7B is a schematic cross-sectional view of the lens unit along the line BB shown in FIG. 7B.
- FIG. 7B is a schematic cross-sectional view of the lens unit along the line AA shown in FIG. 7A. It is a schematic front view of the detection lens of 3rd Embodiment.
- FIG. 3B is a schematic plan view of the lens holder shown in FIG. 3A. It is a schematic top view of the lens unit of 2nd Embodiment.
- FIG. 7B is a schematic front view of the lens unit shown in FIG. 7A.
- FIG. 7B is a schematic cross
- FIG. 9B is a schematic cross-sectional view of the detection lens along the line CC shown in FIG. 9A.
- FIG. 9B is a schematic rear view of the detection lens shown in FIG. 9A.
- It is a schematic front view of the detection lens of 4th Embodiment.
- FIG. 10B is a schematic cross-sectional view of the detection lens along the line CC shown in FIG. 10A.
- FIG. 10B is a schematic plan view of a lens holder that holds the detection lens shown in FIGS. 10A and 10B.
- FIG. 11B is a schematic front view of the lens holder shown in FIG. 11A. It is a schematic front view of the lens unit of 4th Embodiment. It is a front view of the lens unit shown by FIG.
- FIG. 1 is a schematic perspective view of the optical pickup device 100. An optical pickup device 100 will be described with reference to FIG.
- the optical pickup device 100 includes a first light source 110, a diffraction grating 120, a prism-type beam splitter 130, a flat-plate beam splitter 140, a quarter-wave plate 150, a collimator lens 160, and a rising mirror 170.
- elements such as an actuator for driving the objective lens 180 and the collimating lens 160, a holding component such as a holder for holding the various optical elements described above, and an optical base are omitted.
- a reproduction process for the optical disc (BD) 210, the optical disc (DVD) 220, or the optical disc (CD) 230 will be described.
- the first light source 110 emits a blue-violet light beam.
- the wavelength of the blue-violet light beam emitted from the first light source 110 is 390 to 420 nm.
- the first light source 110 emits a substantially linearly polarized blue-violet light beam having a wavelength of 405 nm.
- the blue-violet light beam emitted from the first light source 110 enters the diffraction grating 120.
- the diffraction grating 120 divides into zero-order diffracted light (light that is not diffracted) and ⁇ first-order diffracted light.
- the divided blue-violet light beam enters a prism type beam splitter 130.
- the beam splitter 130 reflects the blue-violet light beam toward the quarter wavelength plate 150.
- the quarter wave plate 150 substantially converts linearly polarized light into circularly polarized light.
- the collimating lens 160 is used as a coupling lens.
- the collimating lens 160 substantially converts the blue-violet light beam into parallel light.
- the parallel light enters the upright mirror 170.
- an optical axis OAV substantially perpendicular to the recording surface of the optical disc (BD) 210 is defined.
- the rising mirror 170 reflects the parallel light toward the objective lens 180 so that the parallel light propagates along the optical axis OAV.
- the objective lens 180 converges the parallel light on the recording surface of the optical disc (BD) 210 to create a light spot.
- the recording surface of the optical disc (BD) 210 reflects a blue-violet light beam.
- the blue-violet light beam passes through the objective lens 180 again and enters the upright mirror 170.
- the rising mirror 170 reflects the blue-violet light beam toward the collimating lens 160.
- the collimating lens 160 converts the blue-violet light beam into convergent light.
- the quarter-wave plate 150 converts the convergent light from the collimator lens 160 into linearly polarized light having a polarization direction different from that of the reflected light from the beam splitter 130. Thereafter, the blue-violet light beam enters the prism type beam splitter 130.
- the prism type beam splitter 130 allows transmission of the blue-violet light beam converted into linearly polarized light.
- the blue-violet light beam transmitted through the prism type beam splitter 130 enters the detection lens 300 through the flat plate type beam splitter 140.
- the detection lens 300 gives astigmatism to the blue-violet light beam. Thereafter, the blue-violet light beam enters the light receiving element 200.
- the optical pickup device 100 includes a first actuator (not shown) that drives the objective lens, and an objective lens holder that holds the objective lens 180.
- the first actuator includes a plurality of suspension wires that support the objective lens holder.
- the objective lens holder is displaced by the first actuator.
- the first actuator drives the objective lens 180 in the focus direction and the tracking direction according to the focus error signal and the tracking error signal, and the information track of the optical disc (BD) 210 is rotated while the optical disc (BD) 210 is rotating.
- the information track of the optical disc (BD) 210 is rotated while the optical disc (BD) 210 is rotating.
- the optical pickup device 100 may include a control unit that drives the objective lens 180 to tilt in the radial direction (radial direction) of the optical disc (BD) 210.
- FIG. 1 shows an optical axis OAH that is substantially orthogonal to the optical axis OAV and passes through the approximate center of the collimating lens 160.
- the optical axis OAH may be defined using a straight line including a portion passing through the collimator lens 160 among straight lines connecting the light emitting point of the first light source 110 and the center of the objective lens 180 in a projective manner.
- the optical pickup device 100 includes a second actuator (not shown) that drives the collimating lens 160.
- the second actuator may be a stepping motor that displaces the collimating lens 160 along the optical axis OAH.
- the position of the collimating lens 160 where the light emitted from the collimating lens 160 becomes parallel light is referred to as a “reference position”.
- the second actuator brings the collimating lens 160 closer to the quarter-wave plate 150 from the reference position, the emitted light from the collimating lens 160 becomes diverging light.
- the optical pickup device 100 can correct, for example, spherical aberration that occurs when the protective substrate of the optical disc (BD) 210 becomes thick.
- the second actuator may bring the collimating lens 160 closer to the objective lens 180 / rise mirror 170 from the reference position. As a result, the outgoing light from the collimating lens 160 becomes convergent light.
- the optical pickup device 100 can correct spherical aberration that occurs when, for example, the protective substrate of the optical disc (BD) 210 becomes thin.
- the second actuator is in accordance with the thickness of the protective substrate,
- the collimating lens 160 may be moved.
- the second actuator can also correct spherical aberration due to temperature change of the objective lens 180 and spherical aberration due to wavelength change of the blue-violet light beam emitted from the first light source 110.
- the first light source 110 may be a semiconductor laser. If a semiconductor laser is used as the first light source 110, the optical pickup device 100 is reduced in size and weight. In addition, the power consumption of the optical pickup device 100 is reduced.
- a polarization separation film may be formed on the reflection surface of the prism type beam splitter 130.
- the polarization separation film may have a high reflectance with respect to the specific linearly polarized light and a high transmittance with respect to other linearly polarized light orthogonal to the specific linearly polarized light.
- the beam splitter 130 since the beam splitter 130 is used together with the quarter wavelength plate 150, it can reflect the emitted light emitted from the first light source 110 with a high reflectivity, and from the optical disc (BD) 210. The reflected light can be transmitted with high transmittance. As a result, light is used efficiently. This results in an improvement in reproduction performance of the optical pickup device 100 and a reduction in power consumption of the optical pickup device 100.
- the second light source 190 can selectively emit a red light beam and an infrared light beam.
- the second light source 190 emits a substantially linearly polarized red light beam.
- the red light beam has a wavelength of 650 nm to 680 nm.
- the second light source 190 emits a red light beam having a wavelength of 660 nm toward the plate-type beam splitter 140.
- the flat beam splitter 140 reflects the red light beam toward the prism beam splitter 130.
- the prism type beam splitter 130 allows transmission of a red light beam. Thereafter, the red light beam is incident on the quarter-wave plate 150.
- the quarter wave plate 150 substantially converts linearly polarized light into circularly polarized light. Thereafter, the red light beam is incident on the collimating lens 160.
- the collimating lens 160 substantially converts the red light beam into parallel light.
- the red light beam then enters the upright mirror 170.
- the rising mirror 170 reflects the red light beam toward the objective lens 180.
- the objective lens 180 focuses on the recording surface of the optical disc (DVD) 220 through the protective substrate to form a light spot.
- DVD optical disc
- the recording surface of the optical disk (DVD) 220 reflects a red light beam.
- the reflected red light beam passes through the objective lens 180 again and then enters the upright mirror 170.
- the rising mirror 170 reflects the red light beam toward the collimating lens 160.
- the collimating lens 160 converts the red light beam into convergent light. Thereafter, the red light beam is incident on the quarter-wave plate 150.
- the quarter-wave plate 150 converts the convergent light from the collimating lens 160 into linearly polarized light having a polarization direction different from that of the reflected light from the beam splitter 130. Thereafter, the red light beam enters the prism type beam splitter 130.
- the prism type beam splitter 130 allows transmission of a red light beam. Thereafter, the red light beam is incident on the detection lens 300 through the flat beam splitter 140.
- the detection lens 300 gives astigmatism to the red light beam. Thereafter, the red light beam is incident on the light receiving element 200.
- the reproducing operation for the optical disc (CD) 230 is substantially the same as the reproducing operation for the optical disc (DVD) 220, but the second light source 190 emits an approximately linearly polarized infrared light beam.
- the infrared light beam has a wavelength of 750 nm to 810 nm.
- the second light source 190 emits a red light beam having a wavelength of 780 nm toward the plate-type beam splitter 140.
- the flat beam splitter 140 reflects an infrared light beam toward the prism beam splitter 130.
- the prism type beam splitter 130 allows transmission of an infrared light beam.
- the infrared light beam then enters the quarter wave plate 150.
- the quarter wave plate 150 substantially converts linearly polarized light into circularly polarized light. Thereafter, the infrared light beam enters the collimating lens 160.
- the collimating lens 160 substantially converts the infrared light beam into parallel light.
- the infrared light beam then enters the upright mirror 170.
- the rising mirror 170 reflects the infrared light beam toward the objective lens 180.
- the objective lens 180 focuses on the recording surface of the optical disc (CD) 230 through the protective substrate to form a light spot.
- the recording surface of the optical disk (CD) 230 reflects an infrared light beam.
- the reflected infrared light beam passes through the objective lens 180 again and then enters the upright mirror 170.
- the rising mirror 170 reflects the infrared light beam toward the collimating lens 160.
- the collimating lens 160 converts the infrared light beam into convergent light. Thereafter, the infrared light beam is incident on the quarter-wave plate 150.
- the quarter-wave plate 150 converts the convergent light from the collimating lens 160 into linearly polarized light having a polarization direction different from that of the reflected light from the beam splitter 130. Thereafter, the infrared light beam enters the prism type beam splitter 130.
- the prism type beam splitter 130 allows transmission of an infrared light beam. Thereafter, the infrared light beam is incident on the detection lens 300 through the flat beam splitter 140.
- the detection lens 300 gives astigmatism to the infrared light beam. The infrared light beam then enters the light receiving element 200.
- the light beam directed from the second light source 190 to the flat beam splitter 140 is mainly S-polarized light.
- Reflected light from the optical disc (DVD) 220 and the optical disc (CD) 230 is mainly converted into P-polarized light by the quarter-wave plate 150, and then enters the flat beam splitter 140.
- the reflection surface of the flat beam splitter 140 may be formed using a polarization separation film.
- the polarization separation film generally has a high reflectance for S-polarized light and a high transmittance for P-polarized light. Since the characteristics of the polarization separation film are effectively used, light is efficiently used. Therefore, the optical pickup device 100 has good reproduction performance and can achieve low power consumption.
- the optical pickup device may include a half-wave plate disposed between the second light source and the flat beam splitter.
- the optical pickup device may use a half-wave plate to align light incident on the flat beam splitter with S-polarized light.
- the optical pickup device 100 according to the present embodiment does not require a half-wave plate. Therefore, the optical pickup device 100 may be formed small and light. Further, the optical pickup device 100 is manufactured at a low cost.
- the second light source 190 may be a semiconductor laser. If a semiconductor laser is used as the second light source 190, the optical pickup device 100 is reduced in size and weight. In addition, the power consumption of the optical pickup device 100 is reduced.
- the second actuator brings the collimating lens 160 closer to the quarter-wave plate 150 from the reference position, and makes the emitted light from the collimating lens 160 divergent. Good.
- a light beam emitted from a virtual object point in the positive (+) direction is incident on the objective lens 180.
- the second actuator may bring the collimating lens 160 closer to the objective lens 180 / rise mirror 170 from the reference position, and the emitted light from the collimating lens 160 may be converged light.
- a light beam emitted from a virtual object point in the negative ( ⁇ ) direction is incident on the objective lens 180.
- the second actuator moves the collimating lens 160 toward the objective lens 180 / the rising mirror 170, and uses the red light beam emitted from the second light source 190 as the convergent light.
- the light may enter the lens 180.
- a part of the spherical aberration is effectively corrected.
- the second actuator moves the collimating lens 160 toward the quarter-wave plate 150, and uses the infrared light beam emitted from the second light source 190 as the diverging light as the objective lens. It may be incident on 180. As a result, a part of the spherical aberration is effectively corrected.
- the blue-violet light beam emitted from the first light source 110, the red light beam emitted from the second light source 190, and the infrared light beam are respectively transmitted to the objective lens 180 by the second actuator that displaces the collimating lens 160.
- the light is selectively incident as convergent light or divergent light. Therefore, a part of spherical aberration caused by the change in the wavelength of light emitted from the light sources corresponding to the optical disc (BD) 210, the optical disc (DVD) 220, and the optical disc (CD) 230 and the difference in the thickness of the protective substrate is effective. Corrected.
- the degree of freedom in designing the diffractive structure of the objective lens 180 is improved by the above-described effective correction. If a large pitch is designed for the diffractive structure, the diffraction efficiency and manufacturing margin will increase. If the light beam is incident on the objective lens 180 as diverging light, the working distance (WD) increases.
- the protective substrate of the optical disk (CD) 230 is relatively thick.
- the objective lens 180 is compatible with a plurality of standards, and the infrared light beam is generated when information is recorded on the optical disc (CD) 230 and / or when information is reproduced from the optical disc (CD) 230. If the light enters the objective lens 180 as diverging light, the working distance becomes small.
- the state of the light beam (parallel light, convergent light, or divergent light) incident on the objective lens 180 after being emitted from the first light source 110 and the second light source 190 may be determined according to the design of the objective lens 180.
- the blue-violet light beam is incident on the objective lens 180 as substantially parallel light.
- the red light beam enters the objective lens 180 as convergent light.
- the infrared light beam enters the objective lens 180 as diverging light.
- other combinations between the type of light beam and the state of the light beam may be utilized.
- a stepping motor is used as the second actuator that drives the collimating lens.
- an actuator using a magnetic circuit or a piezoelectric element may be used as the second actuator. If a stepping motor is used as the second actuator, it is not necessary to monitor the position of the collimating lens 160 on the optical axis OAH. Therefore, the optical pickup device is simplified. On the other hand, if an actuator using a magnetic circuit or a piezoelectric element is used as the second actuator, the drive portion of the actuator becomes small. Therefore, an actuator using a magnetic circuit or a piezoelectric element is suitably used for a small optical head.
- the detection lens 300 is described with reference to FIG.
- the detection lens 300 is designed to generate astigmatism for controlling a focus error according to a general astigmatism method.
- a lens having a cylindrical surface is exemplified.
- the light receiving element 200 has, for example, a light receiving portion divided into four parts. If the light receiving unit receives light transmitted through the detection lens 300, a focus control signal generated by the astigmatism method and a tracking control signal generated by the push-pull method can be generated simultaneously.
- the optical axis OAH of the collimating lens 160 substantially coincides with the radial direction (radial direction) or tangential direction (tangential direction) of the optical disc (optical disc (BD) 210, optical disc (DVD) 220 and optical disc (CD) 230), and If the direction in which astigmatism is given is inclined by about 45 ° with respect to the push-pull generation direction (radial direction), the astigmatism method is applied using the light receiving surface divided into four parts of the light receiving element 200. Therefore, not only a very stable focus control signal can be obtained, but also a very stable tracking control signal can be obtained according to the push-pull method. If the direction in which astigmatism is given is inclined by 45 ° from the radial direction, the direction in which astigmatism is given is also inclined by 45 ° from the tangential direction.
- the angle of the generatrix of the cylindrical surface may be slightly shifted from the aforementioned 45 ° angle.
- the detection lens 300 gives astigmatism to the light beam and generates a focal line on the light receiving element 200.
- the angle of the focal line generated by the detection lens 300 on the light receiving element 200 may match ⁇ 45 ° under the condition of the bus line angle slightly shifted from the 45 ° angle.
- the optimum deviation of the bus angle depends on the optical path difference and aberration given by the optical elements other than the detection lens 300. In general, the angle of the bus is set in the range of 40 ° to 50 ° from the radial direction.
- the optical design described above is widely known.
- the detection lens 300 may be incorporated into the optical pickup device 100 at a rotational position rotated by 180 ° from the designed rotational position. However, the detection lens 300 should not be incorporated into the optical pickup device 100 at the reference position or a rotational position rotated by an angle other than 180 °.
- FIG. 2A is a schematic front view of the detection lens 400.
- FIG. 2B is a schematic side view of the detection lens 400.
- the detection lens 400 is described with reference to FIGS. 1 to 2B.
- the detection lens 400 can be used as the detection lens 300 described with reference to FIG.
- the z axis shown in FIG. 2B represents a direction parallel to the optical axis OA of the detection lens 400.
- the x axis shown in FIG. 2A represents a direction parallel to the horizontal line HL orthogonal to the optical axis OA.
- the y-axis shown in FIGS. 2A and 2B represents a direction parallel to the vertical line VL orthogonal to the optical axis OA and the horizontal line HL.
- the coordinate system shown in FIGS. 2A and 2B is commonly used in various drawings shown below.
- the directions defined by the coordinate system and terms such as “horizontal”, “vertical”, “left”, “right”, “upper” and “lower” are intended to clarify the explanation. Accordingly, the definitions and terms relating to the direction do not limit the principle of this embodiment.
- the vertical line VL is exemplified as the first axis.
- the horizontal line HL is exemplified as the second axis.
- the detection lens 400 includes a cylindrical lens part 410 including a lens surface 411 formed so as to give astigmatism, and a flange part 420 to which the lens part 410 is connected.
- the lens part 410 and the flange part 420 may be integrally molded using a resin molding technique.
- the detection lens 400 may be installed so that light enters the lens surface 411.
- the detection lens 400 may be installed such that light is emitted from the lens surface 411.
- the lens surface 411 is designed so that the lens unit 410 functions as a cylindrical lens.
- the lens surface may be formed in other shapes that can cause astigmatism.
- the flange portion 420 includes a first surface 421 to which the lens portion 410 is connected and a second surface 422 opposite to the first surface 421.
- the second surface 422 may be a flat surface or a concave surface. If a concave surface is formed around the intersection of the second surface 422 and the optical axis OA, the second surface 422 may provide a desired optical effect in cooperation with the lens surface 411 of the lens unit 410. it can.
- the detection lens 400 does not include a portion protruding from the second surface 422. Therefore, the operator who installs the detection lens 400 can correctly set the direction of the detection lens 400 in the optical axis OA (z-axis) direction.
- the flange portion 420 includes a first concave corner portion 431 that is recessed on the right side of the lens portion 410, a second concave corner portion 432 that is recessed below the first concave corner portion 431, and a third concave corner portion 433 that is recessed on the left side of the lens portion 410. And a fourth concave corner portion 434 that is recessed above the third concave corner portion 433.
- the flange portion 420 includes a base 430 defined as a rectangular region surrounded by four line segments connecting the first concave corner portion 431, the second concave corner portion 432, the third concave corner portion 433, and the fourth concave corner portion 434.
- the base 430 is disposed along the optical axis OA defined by the lens unit 410 so that the center of the base 430 substantially coincides with the optical axis OA. Therefore, the lens part 410 is mainly connected to the base part 430.
- the flange 420 includes a rectangular upper protrusion 441 protruding upward from the base 430, a rectangular lower protrusion 442 protruding downward from the base 430, and a rectangular right protrusion protruding rightward from the base 430. And a rectangular left protruding portion 444 protruding leftward from the base portion 430.
- the vertical line VL corresponds to the center line of the upper protrusion 441 and the lower protrusion 442.
- the upper protrusion 441 and the lower protrusion 442 protrude along the vertical line VL.
- the horizontal line HL corresponds to the center line of the right protrusion 443 and the left protrusion 444.
- the right protrusion 443 and the left protrusion 444 protrude along the horizontal line HL.
- the lower protrusion 442 has a point-symmetric relationship with respect to the upper protrusion 441 around the optical axis OA.
- the left protrusion 444 is in a point-symmetric relationship with respect to the right protrusion 443 around the optical axis OA.
- the upper protrusion 441 is exemplified as the first protrusion.
- the lower protrusion 442 is exemplified as the second protrusion.
- the right protrusion 443 is exemplified as the third protrusion.
- the left protrusion 444 is exemplified as the fourth protrusion.
- the upper protruding portion 441 includes an upper intersecting surface 451 that intersects the vertical line VL substantially at a right angle.
- the lower protrusion 442 includes a lower intersection surface 452 that intersects the vertical line VL substantially at a right angle.
- the right protrusion 443 includes a right intersection surface 453 that intersects the horizontal line HL substantially at a right angle.
- the left protrusion 444 includes a left intersection surface 454 that intersects the horizontal line HL at a substantially right angle.
- the upper intersection surface 451 and the lower intersection surface 452 are substantially parallel to the horizontal line HL.
- the right intersection plane 453 and the left intersection plane 454 are substantially parallel to the vertical line VL.
- the upper intersection surface 451 is exemplified as the first intersection surface.
- the lower intersection surface 452 is exemplified as the second intersection surface.
- the right intersection plane 453 is exemplified as the third intersection plane.
- the left intersection plane 454 is exemplified as the
- the distance between the upper intersection plane 451 and the lower intersection plane 452 is represented using the symbol “Y1”.
- the distance between the right intersection plane 453 and the left intersection plane 454 is represented using the symbol “X1”.
- the flange portion 420 is designed such that the distance between the upper intersection surface 451 and the lower intersection surface 452 is longer than the distance between the right intersection surface 453 and the left intersection surface 454 (Y1> X1).
- the distance represented by the symbol “Y1” is exemplified as the first distance.
- the distance represented by the symbol “X1” is exemplified as the second distance.
- the first recessed corner portion 431 is a common base end portion of the upper projecting portion 441 and the right projecting portion 443.
- the upper protruding portion 441 includes a vertical surface 461 extending upward from the first recessed corner portion 431 toward the upper intersecting surface 451.
- the right protrusion 443 includes a horizontal plane 471 extending rightward from the first concave corner 431 toward the right intersection plane 453.
- the first recessed corner portion 431 may be defined as a corner portion formed by the vertical surface 461 and the horizontal surface 471.
- the vertical surface 461 forms a corner portion 481 in cooperation with the upper intersection surface 451.
- the horizontal plane 471 forms a corner 491 in cooperation with the right intersection plane 453.
- the vertical surface 461 is exemplified as the first projecting surface.
- the corner portion 481 is exemplified as the first corner portion.
- the horizontal plane 471 is exemplified as the third projecting surface.
- the corner portion 491 is exemplified as the third corner portion.
- the second recessed corner 432 is a common base end of the lower protrusion 442 and the right protrusion 443.
- the lower protruding portion 442 includes a vertical surface 462 extending downward from the second recessed corner portion 432 toward the lower intersecting surface 452.
- the right protrusion 443 includes a horizontal plane 472 extending rightward from the second recessed corner 432 toward the right intersection plane 453.
- the second recessed corner portion 432 may be defined as a corner portion formed by the vertical surface 462 and the horizontal surface 472.
- the vertical surface 462 of the lower protrusion 442 is formed on substantially the same plane as the vertical surface 461 of the upper protrusion 441.
- the horizontal planes 471 and 472 of the right protrusion 443 are substantially parallel.
- the vertical surface 462 forms a corner portion 482 in cooperation with the lower intersection surface 452.
- the horizontal surface 472 cooperates with the right intersection surface 453 to form a corner portion 492.
- the third concave corner 433 is a common base end of the lower protrusion 442 and the left protrusion 444.
- the lower protrusion 442 includes a vertical surface 463 that extends downward from the third concave corner 433 toward the lower intersection surface 452.
- the left protruding portion 444 includes a horizontal surface 473 extending leftward from the third recessed corner portion 433 toward the left intersection surface 454.
- the third recessed corner portion 433 may be defined as a corner portion formed by the vertical surface 463 and the horizontal surface 473.
- the vertical surfaces 462 and 463 of the lower protrusion 442 are substantially parallel.
- the horizontal plane 473 of the left protrusion 444 is formed on substantially the same plane as the horizontal plane 472 of the right protrusion 443.
- the vertical surface 463 cooperates with the lower intersection surface 452 to form a corner portion 483.
- the horizontal surface 473 cooperates with the left intersection surface 454 to form a corner portion 493.
- the vertical surface 463 is exemplified as the second projecting surface.
- the corner portion 483 is exemplified as the second corner portion.
- the fourth recessed corner portion 434 is a common base end portion of the upper projecting portion 441 and the left projecting portion 444.
- the upper protruding portion 441 includes a vertical surface 464 extending upward from the fourth recessed corner portion 434 toward the upper intersecting surface 451.
- the left protrusion 444 includes a horizontal plane 474 extending leftward from the fourth concave corner 434 toward the left intersection plane 454.
- the fourth recessed corner portion 434 may be defined as a corner portion formed by the vertical surface 464 and the horizontal surface 474.
- the vertical surface 464 of the upper protrusion 441 is formed on substantially the same plane as the vertical surface 463 of the lower protrusion 442.
- the horizontal surfaces 473 and 474 of the left protrusion 444 are substantially parallel.
- the vertical surface 464 forms a corner portion 484 in cooperation with the upper intersection surface 451.
- the horizontal surface 472 cooperates with the right intersection surface 453 to form a corner portion 494.
- the distance between the vertical surfaces 461 and 464 of the upper projecting portion 441 is represented by the symbol “X2”.
- the distance between the vertical surfaces 462 and 463 of the lower protrusion 442 may also be expressed using the symbol “X2”.
- the distance between the horizontal planes 473 and 474 of the left protrusion 444 is represented by the symbol “Y2”.
- the distance between the horizontal surfaces 471 and 472 of the right protrusion 443 may also be expressed using the symbol “Y2”.
- the distance between the corner portion 481 of the upper projecting portion 441 and the corner portion 483 of the lower projecting portion 442 is represented using the symbol “D1”.
- the distance between the corner corner 483 of the lower protrusion 442 and the corner corner 491 of the right protrusion 443 is represented using the symbol “D2”.
- the width of the lens portion 410 on the horizontal line HL is represented using the symbol “Da”.
- FIG. 2A shows a bus GL of a cylindrical lens used as the lens surface 411.
- the lens surface 411 has a different curvature between a direction along the bus GL and a direction orthogonal to the bus GL.
- the angle between the bus GL and the horizontal line HL is represented by using the symbol “ ⁇ 1”.
- the horizontal line HL, the vertical line VL, and the bus GL shown in FIG. 2A are all virtual lines.
- the lens surface 411 formed as a cylindrical lens is exemplified as the first lens surface.
- the first lens surface may be another lens element that can cause astigmatism.
- a lens element having a toroidal surface may be used.
- the flange portion 420 has a line-symmetric shape with respect to the horizontal line HL.
- the flange portion 420 has a line-symmetric shape with respect to the vertical line VL.
- the lens portion 410 protrudes from the first surface 421, whereas the flange portion 420 does not have a portion protruding from the second surface 422.
- FIG. 3A is a schematic plan view of a lens holder 500 that holds the detection lens 400 described above.
- FIG. 3B is a schematic front view of the lens holder 500. The lens holder 500 will be described with reference to FIGS. 2A to 3B.
- the lens holder 500 includes a holding wall 530 that defines a lens chamber 510 into which the lens portion 410 is inserted and a flange chamber 520 into which the flange portion 420 is inserted.
- the holding wall 530 includes an inner bottom surface 512 positioned below the lens unit 410 accommodated in the lens chamber 510, an inner right surface 513 positioned on the right side of the lens unit 410, and an inner left surface positioned on the left side of the lens unit 410. 514.
- the lens chamber 510 is defined by an inner right surface 513, an inner bottom surface 512, and an inner left surface 514.
- the holding wall 530 includes a lower adjacent surface 522 adjacent to the lower intersection surface 452 of the flange portion 420 accommodated in the flange chamber 520, a right adjacent surface 523 adjacent to the right intersection surface 453, and a left adjacent to the left intersection surface 454.
- the holding wall 530 further includes a first adjacent surface 531 facing the first surface 421 of the flange portion 420 accommodated in the flange chamber 520 and a second adjacent surface 532 facing the second surface 422.
- the first adjacent surface 531 is adjacent to the boundary between the lens chamber 510 and the flange chamber 520.
- the holding wall 530 further includes an outer surface 533 opposite to the second adjacent surface 532.
- the flange chamber 520 is exemplified as the first insertion space.
- the lens chamber 510 is exemplified as the second insertion space.
- the holding wall 530 is exemplified as a wall portion.
- a light transmitting hole 534 is formed in the holding wall 530.
- the light transmitting hole 534 allows passage of incident light incident on the detection lens 400 and / or outgoing light emitted from the detection lens 400.
- the distance between the right adjacent surface 523 and the left adjacent surface 524 (that is, the width dimension of the flange chamber 520 in the x-axis direction) is represented by the symbol “W1”.
- the distance between the inner right surface 513 and the inner left surface 514 (that is, the width dimension of the lens chamber 510 in the x-axis direction) is represented using the symbol “W2”.
- the distance between the first adjacent surface 531 and the second adjacent surface 532 (that is, the thickness dimension of the flange chamber 520 in the z-axis direction) is expressed using the symbol “W3”.
- the distance between the upper intersection surface 451 and the lower intersection surface 452 is the distance between the right adjacent surface 523 and the left adjacent surface 524 (FIG. 3A). In this case, it is longer than the symbol “W1”.
- the distance between the right intersection plane 453 and the left intersection plane 454 (represented using the symbol “X1” in FIG. 2A) is shorter than the distance between the right adjacent plane 523 and the left adjacent plane 524.
- the distance between the right intersection plane 453 and the left intersection plane 454 is greater than the distance between the inner right plane 513 and the inner left plane 514 (indicated by using the symbol “W2” in FIG. 3A). long.
- the distance between the inner right surface 513 and the inner left surface 514 is longer than the width of the lens portion 410 on the horizontal line HL (shown using the symbol “Da” in FIG. 2A). Therefore, a relationship represented by the following inequality holds between these dimension values described with reference to FIGS. 2A and 3A.
- FIG. 4A is a schematic plan view of the lens unit 600.
- FIG. 4B is a schematic front view of the lens unit 600.
- FIG. 5A is a schematic cross-sectional view of the lens unit 600 taken along the line BB shown in FIG. 4B.
- FIG. 5B is a schematic cross-sectional view of the lens unit 600 taken along the line AA shown in FIG. 4A.
- the lens unit 600 will be described with reference to FIGS. 2A, 3A, and 4A to 5B.
- the lens unit 600 includes a detection lens 400 and a lens holder 500. An operator can insert the lens portion 410 into the lens chamber 510 and insert the flange portion 420 into the flange chamber 520.
- the lens part 410 protrudes from the first surface 421.
- the dimension value “X1” described with reference to FIG. 2A is larger than the dimension value “W2” described with reference to FIG. 3A. If 410 is opposed to the second adjacent surface 532, the detection lens 400 is not accommodated in the lens holder 500. Therefore, the operator is unlikely to mistake the direction of the detection lens 400 in the direction along the optical axis OA.
- the dimension value “Da” described with reference to FIG. 2A is smaller than the dimension value “W2” described with reference to FIG. 3A.
- the dimension value “X1” described with reference to FIG. 2A is smaller than the dimension value “W1” described with reference to FIG. 3A. Therefore, if the operator correctly sets the direction of the detection lens 400 and keeps the upper cross surface 451 substantially horizontal, the detection lens 400 is easily accommodated in the lens holder 500.
- the dimension value “Y1” described with reference to FIG. 2A is larger than the dimension value “W1” described with reference to FIG. 3A. Therefore, if the operator tilts the upper intersection surface 451 from the horizontal position, the detection lens 400 is difficult to be accommodated in the lens holder 500. Therefore, the operator is unlikely to mistake the rotation position of the detection lens 400 around the optical axis OA.
- the operator rotates the detection lens 400 by 180 ° from the rotational position designed for the detection lens 400 (that is, the rotational position of the detection lens 400 shown in FIGS. 4A to 5B).
- the design of the lens unit 600 of the present embodiment allows it to be accommodated.
- the detection lens 400 rotated from the normal rotation position (that is, the rotation position of the detection lens 400 shown in FIGS. 4A to 5B) by the operator at an angle other than 180 ° is accommodated in the lens holder 500. Therefore, the design of the lens unit 600 of this embodiment is not allowed.
- the bus GL described with reference to FIG. 2A is substantially the same between the detection lens 400 at the normal rotation position and the detection lens 400 rotated about the optical axis OA by 180 ° from the normal rotation position. Can keep the position of. That is, the direction of astigmatism generated by the detection lens 400 is maintained. Therefore, even if the operator incorporates the detection lens 400 rotated by 180 ° from the normal rotation position into the lens holder 500, the lens unit 600 can maintain the performance.
- the detection lens may be incorporated into the lens holder at a position rotated by 90 ° from the normal rotation position. In this case, the sign of the focus control signal is inverted.
- the detection lens 400 is incorporated into the lens holder 500 only at a rotational position where the sign of the focus control signal is not reversed.
- the inner bottom surface 512 is flush with the lower adjacent surface 522.
- the inner bottom surface does not interfere with the lens portion 410, it may be formed at another height position.
- the distance between the corner portion 481 of the upper projecting portion 441 and the corner portion 483 of the lower projecting portion 442 is represented using the symbol “D1”.
- the dimension value of the diagonal distance is expressed by the following mathematical formula.
- the flange portion 420 is designed so that the diagonal distance “D1” is larger than the width dimension “W1” of the flange chamber 520 described with reference to FIG. 3A.
- the relationship between the diagonal distance “D1” and the width dimension “W1” of the flange chamber 520 is expressed by the following inequality.
- the distance between the corner 483 of the lower protrusion 442 and the corner 491 of the right protrusion 443 is represented by the symbol “D2”.
- the dimension value of the diagonal distance is expressed by the following mathematical formula.
- the flange portion 420 is designed such that the diagonal distance “D2” is larger than the width dimension “W1” of the flange chamber 520 described with reference to FIG. 3A.
- the relationship between the diagonal distance “D2” and the width dimension “W1” of the flange chamber 520 is expressed by the following inequality.
- the distance “X2” between the vertical surfaces 461 and 464 of the upper projecting portion 441 is between the right intersection surface 453 adjacent to the right adjacent surface 523 and the left intersection surface 454 adjacent to the left adjacent surface 524. It is shorter than the distance “X1”.
- the flange portion 420 is line symmetric with respect to the vertical line VL. Therefore, a gap is formed between the right adjacent surface 523 and the vertical surface 461 and between the left adjacent surface 524 and the vertical surface 464.
- the lens unit 600 includes a first adhesive portion 611 and a second adhesive portion 612.
- the first adhesive portion 611 may be an adhesive applied in a gap surrounded by the right adjacent surface 523, the vertical surface 461, and the horizontal surface 471.
- the second adhesive portion 612 may be an adhesive applied in a gap surrounded by the left adjacent surface 524, the vertical surface 464, and the horizontal surface 474.
- the space surrounded by the right adjacent surface 523, the vertical surface 461, and the horizontal surface 471 is exemplified as the first bonding space.
- a space surrounded by the left adjacent surface 524, the vertical surface 464, and the horizontal surface 474 is exemplified as the second bonding space.
- the distance between the fourth recessed corner 434 and the optical axis OA is represented by using the symbol “D3”.
- the distance between the first concave corner 431 and the optical axis OA, the distance between the second concave corner 432 and the optical axis OA, and the distance between the third concave corner 433 and the optical axis OA are also represented by the symbol “ D3 "may be used.
- the first recessed corner portion 431 and the fourth recessed corner portion 434 define a shape that is recessed toward the optical axis OA. Therefore, the 1st adhesion part 611 and the 2nd adhesion part 612 are located near optical axis OA. Therefore, the positional stability of the detection lens 400 is maintained at a high level as compared with a general detection lens having no depression shape. For example, even if the detection lens 400 is thermally expanded or contracted according to the temperature change of the temperature of the optical pickup device 100 described with reference to FIG. 1, the detection lens 400 is hardly displaced in the lens holder 500. .
- the adhesive is applied to the space surrounded by the right adjacent surface 523, the vertical surface 461, and the horizontal surface 471, and the space surrounded by the left adjacent surface 524, the vertical surface 464, and the horizontal surface 474. Therefore, the lens holder 500 does not require a dedicated portion for applying the adhesive. Therefore, the lens holder 500 is easily designed so that the lens holder 500 has high mechanical strength. In addition, since the adhesive hardly protrudes from the upper surface of the holding wall 530, the optical pickup device 100 on which the lens unit 600 is mounted may be designed to be small.
- the detection lens 400 is line symmetric with respect to the vertical line VL. Further, the detection lens 400 is line symmetric with respect to the horizontal line HL. Therefore, if the detection lens 400 is molded using a resin molding technique, high performance is maintained even after molding.
- the detection lens 400 may be turned upside down and mounted on the lens holder 500.
- a recess having the same shape as the above-described gap is also formed between the right protrusion 443 and the lower protrusion 442 and between the left protrusion 444 and the lower protrusion 442. Therefore, even if the operator rotates the detection lens 400 from the normal rotation position by 180 ° and incorporates the detection lens 400 into the lens holder 500, high mechanical strength between the detection lens 400 and the lens holder 500 is ensured.
- FIG. 6 is a schematic plan view of the lens holder 500.
- the lens holder 500 will be described with reference to FIGS. 1, 2A and 6.
- the lens holder 500 may be designed as an optical base on which various optical elements described with reference to FIG. 1 are attached. That is, in the present embodiment, the lens holder 500 is integrated with the optical base.
- the optical pickup device 100 includes a shaft 102 that supports a lens holder 500 designed as an optical base.
- the various optical elements described with reference to FIG. 1 are mounted on an optical base supported by a shaft 102.
- a lens chamber 510 and a flange chamber 520 are formed on the optical base.
- the lens unit 410 described with reference to FIG. 2A is accommodated in the lens chamber 510. Further, the flange portion 420 is accommodated in the flange chamber 520. Thereafter, the detection lens 400 is fixed to the optical base using an adhesive.
- the lens holder 500 is designed as an optical base, the number of parts of the optical pickup device 100 is reduced. Therefore, the optical pickup device 100 is manufactured at a low cost. In addition, the optical pickup device 100 is designed to be small.
- the optical pickup device may include an optical base formed separately from the lens holder.
- the detection lens may be incorporated into the lens holder after the lens holder is placed and fixed on the optical base.
- a lens holder in which a detection lens is incorporated may be placed and fixed on the optical base.
- the detection lens 400 includes a substantially cylindrical lens portion 410 and a substantially cross-shaped flange portion 420. Compared to the detection lens of the prior art, the detection lens 400 has a simple shape. Therefore, the detection lens 400 is easily molded by a resin molding technique.
- the detection lens 400 (labeled with “300” in FIG. 1) is disposed near the light receiving element 200. Since the convergent light passes through the detection lens 400, the light density is increased on the detection lens 400. Therefore, an olefin resin is preferably used as a material for the detection lens 400. If the detection lens 400 is molded from an olefin-based resin, characteristics such as transmittance and transmitted wavefront aberration of the detection lens 400 are deteriorated even in an environment where the blue-violet light beam emitted from the first light source 110 is irradiated for a long period of time. Is less likely to occur.
- the detection lens 400 if the detection lens 400 is molded from an olefin resin, the detection lens 400 has high blue light resistance.
- the olefin resin used in the detection lens 400 include “340R” and “350R” of the ZEONEX (registered trademark) (manufactured by Nippon Zeon) series. If these resin materials are used, the detection lens 400 can have high blue light resistance.
- FIG. 7A is a schematic plan view of a lens unit 600A of the second embodiment.
- FIG. 7B is a schematic front view of the lens unit 600A.
- the lens unit 600A will be described with reference to FIGS. 7A and 7B.
- symbol is attached
- the description relevant to 1st Embodiment is used with respect to the element to which the same code
- the lens unit 600A includes a detection lens 400.
- the lens unit 600A further includes a lens holder 500A that holds the detection lens 400.
- the lens holder 500A includes a holding wall 530A.
- the holding wall 530A defines a lens chamber 510A in which the lens portion 410 is accommodated and a flange chamber 520A in which the flange portion 420 is accommodated.
- the lens chamber 510A may have the same width dimension as the first embodiment (that is, the dimension in the x-axis direction).
- the lens chamber 510A may have the same thickness dimension as the first embodiment (that is, the dimension in the z-axis direction). However, the lens chamber 510A has a depth dimension smaller than the depth dimension (that is, the dimension in the y-axis direction) of the first embodiment.
- the flange chamber 520A may have the same width dimension as that of the first embodiment.
- the flange chamber 520A may have the same thickness dimension as that of the first embodiment. However, the flange chamber 520A has a depth dimension smaller than the depth dimension of the first embodiment.
- the holding wall 530A includes an upper surface 535. Unlike the first embodiment, the upper surface 535 is located below the horizontal planes 471 and 474. Accordingly, the horizontal planes 471, 474, a part of the right intersection plane 453 and a part of the left intersection plane 454 protrude from the upper surface 535.
- FIG. 8A is a schematic cross-sectional view of the lens unit 600A along the line BB shown in FIG. 7B.
- FIG. 8B is a schematic cross-sectional view of the lens unit 600A along the line AA shown in FIG. 7A.
- the lens unit 600A will be further described with reference to FIGS. 1 and 7A to 8B.
- the lens unit 600A further includes a first adhesive portion 611A and a second adhesive portion 612A.
- the first adhesive portion 611A is an adhesive applied so as to cover the horizontal surface 471 and the right intersection surface 453 protruding from the upper surface 535.
- the second adhesive portion 612 ⁇ / b> A is an adhesive applied so as to cover the horizontal plane 474 and the left intersection plane 454 that protrude from the upper surface 535.
- the positional stability of the detection lens 400 is maintained at a high level as compared with a general detection lens having no depression shape. For example, even if the detection lens 400 is thermally expanded or contracted according to the temperature change of the temperature of the optical pickup device 100 described with reference to FIG. 1, the detection lens 400 is hardly displaced in the lens holder 500A. .
- the horizontal planes 471, 474, a part of the right intersection surface 453 and a part of the left intersection surface 454 are covered with the adhesive, for example, even if a drop impact is applied to the lens holder 500A, the detection lens 400 Becomes difficult to displace. Alternatively, the detection lens 400 is difficult to drop off from the lens holder 500A.
- the horizontal planes 471 and 474 are located above the upper surface 535.
- the horizontal planes 471 and 474 may be flush with the upper surface of the lens holder.
- FIG. 9A is a schematic front view of the detection lens 400B of the third embodiment.
- FIG. 9B is a schematic cross-sectional view of the detection lens 400B along the line CC shown in FIG. 9A.
- FIG. 9C is a schematic rear view of the detection lens 400B.
- the detection lens 400B is described with reference to FIGS. 1 and 9A to 9C.
- symbol is attached
- the description relevant to 1st Embodiment is used with respect to the element to which the same code
- the detection lens 400B can be used as the detection lens 300 described with reference to FIG.
- the detection lens 400B includes a lens unit 410.
- the detection lens 400B further includes a flange part 420B on which the lens part 410 is formed. Similar to the first embodiment, the flange portion 420B includes a first surface 421 to which the lens portion 410 is connected. The flange portion 420B further includes a second surface 422B opposite to the first surface 421.
- the detection lens 400B is different from the first embodiment on the second surface 422B. The description of the first embodiment is used for other features of the detection lens 400B.
- the second surface 422B includes a concave region 423 opposite to the lens surface 411 and a surrounding region 429 surrounding the concave region 420.
- the recessed area 423 is recessed with respect to the surrounding area 429.
- the depth of the depression of the concave area 423 may be determined. Since the flange portion 420B has a cross shape according to the dimensional relationship described in relation to the first embodiment, the advantageous effects described in relation to the first embodiment are provided.
- the piece forming the base 430 and the piece forming the concave region 423 may be created independently. As a result, the surface accuracy of the recessed area 423 is increased.
- a lens may be formed in the concave region 423 so that a portion protruding beyond the second surface 422B of the base portion 430 is not generated.
- the lens formed in the concave region 423 may function as a concave lens or a convex lens.
- the recessed area 423 may be planar.
- Various structures and surface shapes may be formed in the recessed region 423 as long as a portion protruding beyond the second surface 422B of the base 430 does not occur.
- FIG. 10A is a schematic front view of a detection lens 400C of the fourth embodiment.
- FIG. 10B is a schematic cross-sectional view of the detection lens 400C along the line CC shown in FIG. 10A.
- the detection lens 400C will be described with reference to FIGS. 1, 10A, and 10B.
- symbol is attached
- the description relevant to 3rd Embodiment is used with respect to the element to which the same code
- the detection lens 400C can be used as the detection lens 300 described with reference to FIG.
- the detection lens 400C includes a lens unit 410.
- the detection lens 400C further includes a flange portion 420C on which the lens portion 410 is formed.
- the flange portion 420C includes a first surface 421 to which the lens portion 410 is connected and a second surface 422B in which a lens region 423 is formed.
- the flange portion 420C includes a base portion 430, an upper protruding portion 441, a lower protruding portion 442, a right protruding portion 443, and a left protruding portion 444.
- the flange portion 420C further includes a gate portion 435 protruding from the upper intersection surface 451.
- the detection lens 400C includes a substantially cylindrical lens portion 410 and a substantially cross-shaped flange portion 420C. Compared with the detection lens of the prior art, the detection lens 400C has a simple shape. Therefore, the detection lens 400C is easily molded by a resin molding technique.
- the gate portion 435 is formed corresponding to a gate of a mold apparatus for feeding molten resin into a cavity formed by a mold used for resin molding.
- the principle of the present embodiment enables an operator to use the detection lens 400C without requiring complete removal of the remaining portion of the gate portion 435. Therefore, the principle of this embodiment makes the optical pickup device 100 described with reference to FIG. 1 inexpensive.
- the flange portion 420C has a point-symmetric shape around the optical axis OA. Therefore, the gate portion may protrude from the lower intersection surface 452.
- the width (that is, the dimension in the x-axis direction) of the gate portion 435 is expressed using the symbol “De”.
- the amount of protrusion of the gate portion 435 from the upper intersection plane 451 is represented using the symbol “Dh”.
- FIG. 11A is a schematic plan view of a lens holder 500C designed to hold the detection lens 400C described above.
- FIG. 11B is a schematic front view of the lens holder 500C. The lens holder 500C will be described with reference to FIGS. 10A to 11B.
- the lens holder 500 includes a holding wall 530C to which the detection lens 400C is attached. Similar to the first embodiment, the holding wall 530C defines a lens chamber 510 into which the lens unit 410 is inserted. The holding wall 530C further defines a flange chamber 520C into which the flange portion 420C is inserted. In the present embodiment, the flange chamber 520C is exemplified as the first insertion space. The holding wall 530C is exemplified as a wall portion.
- the holding wall 530C includes a lower adjacent surface 522, a right adjacent surface 523, a left adjacent surface 524, a first adjacent surface 531, a second adjacent surface 532, an outer surface 533, and an upper surface. 535.
- the holding wall 530C further includes a right pedestal portion 536 that protrudes upward from the lower adjacent surface 522, and a left pedestal portion 537 that protrudes upward from the lower adjacent surface 522 on the left side of the right pedestal portion 536.
- the holding wall 530C is different from the first embodiment in the right pedestal portion 536 and the left pedestal portion 537. Regarding other features of the holding wall 530C, the description of the first embodiment is incorporated.
- FIG. 12 is a schematic front view of the lens unit 600C.
- the lens unit 600C will be described with reference to FIGS. 10A and 12.
- the lens unit 600C includes a detection lens 400C and a lens holder 500C.
- the detection lens 400C shown in FIG. 12 is incorporated in the lens holder 500C at a normal rotational position.
- the right pedestal portion 536 and the left pedestal portion 537 protrude toward the flange portion 420C.
- the protruding amounts of the right pedestal portion 536 and the left pedestal portion 537 from the lower adjacent surface 522 are represented using the symbol “Wh”.
- one of the right pedestal 536 and the left pedestal 537 is exemplified as the first pedestal.
- the other of the right pedestal 536 and the left pedestal 537 is exemplified as the second pedestal.
- the lens holder 500C is designed so that the protrusion amount “Wh” of the right pedestal portion 536 and the left pedestal portion 537 from the lower adjacent surface 522 is larger than the protrusion amount “Dh” of the gate portion 435 from the upper intersection surface 451.
- the relationship between the protrusion amount “Wh” of the right pedestal portion 536 and the left pedestal portion 537 and the protrusion amount “Dh” of the gate portion 435 is expressed by the following inequality.
- the right pedestal portion 536 includes a left surface 538 that faces the left pedestal portion 537.
- the left pedestal portion 537 includes a right surface 539 that faces the left surface 538 of the right pedestal portion 536.
- the distance between the left surface 538 and the right surface 539 is represented using the symbol “We”.
- the lens holder 500C is designed such that the distance “We” between the left surface 538 and the right surface 539 is longer than the width “De” of the gate portion 435.
- the relationship between the distance “We” between the left surface 538 and the right surface 539 and the width “De” of the gate portion 435 is expressed by the following inequality.
- the gate portion 435 is exposed from the lens holder 500C. Since interference between the gate part 435 and the lens holder 500C does not occur, the gate part 435 may not be removed.
- FIG. 13 is a front view of the lens unit 600C.
- the lens unit 600C will be further described with reference to FIGS. 10A, 12 and 13.
- the detection lens 400C shown in FIG. 13 is rotated by 180 ° from the normal rotation position and incorporated in the lens holder 500C. Accordingly, the gate portion 435 is disposed near the lower adjacent surface 522. Since the protrusion amount “Wh” of the right pedestal portion 536 and the left pedestal portion 537 from the lower adjacent surface 522 is set to a value larger than the protrusion amount “Dh” of the gate portion 435 from the upper intersection surface 451, the gate portion 435 does not interfere with the lower adjacent surface 522.
- the right pedestal 536 and the left pedestal 537 are A space into which the gate portion 435 of the detection lens 400C rotated by 180 ° from the rotation position (the rotation position of the detection lens 400C shown in FIG. 12) is inserted can be defined.
- the detection lens 400C is rotated by 180 ° from the normal rotation position and is inserted into the lens holder 500C, the left surface 538 and the right surface 539 face the gate portion 435.
- the detection lens 400C is appropriately supported by the lens holder 500C.
- one of the left surface 538 and the right surface 539 is exemplified as the first facing surface.
- the other of the left surface 538 and the right surface 539 is exemplified as the second facing surface.
- a gate that protrudes from the right or left intersection is not preferred. If the gate portion protrudes from the right intersection surface or the left intersection surface, the lens holder requires an avoidance structure for avoiding interference with the gate portion.
- the avoidance structure makes it difficult to position the detection lens in the x-axis direction. Since the distance between the right intersection surface and the right adjacent wall or the distance between the left intersection surface and the left adjacent wall is increased, the amount of adhesive applied to fix the detection lens to the lens holder is also increased. As a result, the amount of displacement of the detection lens due to a change in the temperature of the detection lens also increases.
- the gate portion 435 protrudes from the upper intersection surface 451 or the lower intersection surface 452 as described above, the above-described problem is less likely to occur.
- the detection lens 400C is mounted on the lens holder 500C without causing interference between the gate portion 435 and the lens holder 500C at the normal rotation position or the rotation position rotated 180 ° from the normal rotation position. Therefore, the operator does not have to pay excessive attention to the direction of the detection lens 400C. For example, the operator can accurately incorporate the detection lens 400C into the lens holder 500C without observing a magnified image using a microscope.
- the flange portion 420 ⁇ / b> C has a substantially cross shape similar to the first to third embodiments. Therefore, the detection lens 400C is fixed to the lens holder 500C according to the same adhesion technique as in the first to third embodiments. Therefore, even in an environment where temperature changes occur, the detection lens 400C is less likely to be displaced with respect to the lens holder 500C. In addition, the detection lens 400C is unlikely to fall off the lens holder 500C even in an environment where an impact is applied.
- FIGS. 14A to 14D are schematic plan views of the lens holder 500C. 14A to 14D, various designs relating to the pedestal portions (the right pedestal portion 536 and the left pedestal portion 537) will be described.
- FIG. 14A shows a first design pattern related to the pedestal portion.
- the right pedestal portion 536 and the left pedestal portion 537 may be a cylinder protruding from the lower adjacent surface 522.
- FIG. 14B shows a second design pattern related to the pedestal portion.
- the right pedestal 536 and the left pedestal 537 may be rectangular columns protruding from the lower adjacent surface 522.
- FIG. 14C shows a third design pattern related to the pedestal portion.
- the right pedestal 536 and the left pedestal 537 may be oblong cylinders protruding from the lower adjacent surface 522.
- FIG. 14D shows a fourth design pattern related to the pedestal portion.
- the right pedestal 536 and the left pedestal 537 may be ribs extending from the lower adjacent surface 522 to the inner bottom surface 512.
- the right pedestal portion 536 and the left pedestal portion 537 are designed so that the inequality relationship of Expression 6 and Expression 7 is satisfied.
- the right pedestal 536 and the left pedestal 537 may be formed integrally with the lower adjacent surface 522 (and the inner bottom surface 512).
- the right pedestal 536 and the left pedestal 537 may be members different from the lower adjacent surface 522 (and the inner bottom surface 512).
- the right pedestal portion 536 and the left pedestal portion 537 are fixed to the lower adjacent surface 522 (and the inner bottom surface 512) by an adhesive or other appropriate technique.
- FIG. 15 is a schematic front view of a detection lens 400D of the fifth embodiment.
- the detection lens 400D will be described with reference to FIG.
- symbol is attached
- the description relevant to 4th Embodiment is used with respect to the element to which the same code
- the detection lens 400D includes a lens unit 410.
- the detection lens 400D further includes a flange portion 420D to which the lens portion 410 is connected.
- the flange portion 420D includes a gate portion 435 as in the fourth embodiment.
- the flange portion 420D includes a base portion 430D, an upper protrusion portion 441D protruding upward from the base portion 430D, a lower protrusion portion 442D protruding downward from the base portion 430D, a right protrusion portion 443D protruding rightward from the base portion 430D, and a base portion A left protrusion 444D protruding leftward from 430D.
- the base 430D includes a curved first concave corner 431D between the upper projection 441D and the right projection 443D, a curved second concave corner 432D between the right projection 443D and the lower projection 442D, and a lower projection.
- the upper projecting portion 441D includes an upper intersecting surface 451 and vertical surfaces 461 and 464. Unlike the fourth embodiment, the upper projecting portion 441D includes a curved corner portion 481D between the upper intersecting surface 451 and the vertical surface 461. The upper protruding portion 441D includes a curved corner portion 484D between the upper intersecting surface 451 and the vertical surface 464.
- the right protrusion 443D includes a right intersection surface 453.
- the right protruding portion 443D includes a curved corner portion 491D at the upper end of the right intersection surface 453 and a curved corner portion 492D at the lower end of the right intersection surface 453.
- the right protruding portion 443D has a contour curved in a substantially S shape from the first recessed corner portion 431D to the corner corner portion 491D. Further, the right protruding portion 443D has a contour curved in a substantially S shape from the second recessed corner portion 432D to the corner corner portion 492D.
- the lower protrusion 442D includes a lower intersection surface 452 and vertical surfaces 462 and 463. Unlike the fourth embodiment, the lower protrusion 442D includes a curved corner 482D between the lower intersection surface 452 and the vertical surface 462. The lower protrusion 442D includes a curved corner 483D between the lower intersection surface 452 and the vertical surface 463.
- the left protrusion 444D includes a left intersection surface 454.
- the left protrusion 444D includes a curved corner 493D at the lower end of the left intersection plane 454 and a curved corner 494D at the upper end of the left intersection plane 454.
- the left protruding portion 444D has a contour curved in a substantially S shape from the third concave corner portion 433D to the corner corner portion 493D. Further, the left protruding portion 444D has a contour curved in a substantially S shape from the fourth concave corner portion 434D to the corner corner portion 494D.
- the corner portions 481D, 482D, 483D, 484D, 491D, 492D, 493D, and 494D are curved. Therefore, the detection lens 400D is less likely to cause chipping defects such as chipping. Further, the first concave corner portion 431D, the second concave corner portion 432D, the third concave corner portion 433D, and the fourth concave corner portion 434D are also curved. Therefore, the detection lens 400D is less prone to cracking defects such as cracks.
- all corners of the flange portion 420D are curved.
- a bending process may be performed on some corners.
- Formulas related to the dimension value “D1” and the dimension value “D3” described in relation to the first embodiment can also be applied to the flange portion 420D. If the dimension values “X1”, “Y1”, “X2”, “Y2” used in the mathematical formulas for the dimension value “D1” and the dimension value “D3” are reduced by the curving process at the corners, the dimension The value “D1” and the dimension value “D3” are appropriately calculated. Therefore, the detection lens 400D is less likely to be inserted into the lens holder at an incorrect angle according to the principle described in relation to the first embodiment.
- the corners of the flange 420D are curved.
- the C surface treatment may be applied to the corners of the flange portion.
- FIG. 16 is a schematic front view of a detection lens 400E according to the sixth embodiment.
- the detection lens 400E is described with reference to FIG. 1, FIG. 3A, and FIG.
- symbol is attached
- the description relevant to 1st Embodiment, 3rd Embodiment, and 5th Embodiment is used with respect to the element to which the same code
- the detection lens 400E includes a lens portion 410E and a flange portion 420E to which the lens portion 410E is connected.
- the lens portion 410E includes a distal end surface 412 on which the lens surface described with reference to the first embodiment is formed, a proximal end portion 413 connected to the flange portion 420E, and a distal end surface 412 and a proximal end portion 413. And a peripheral surface 414 therebetween.
- the peripheral surface 414 is narrowed from the base end portion 413 toward the distal end surface 412.
- the taper angle of the peripheral surface 414 is represented by using the symbol “ ⁇ 2”.
- the flange portion 420E includes a first surface 421 and a second surface 422B. Similar to the fifth embodiment, the flange portion 420E further includes a gate portion 435.
- the flange portion 420E includes an upper intersection surface 451E on which the gate portion 435 is formed, and a lower intersection surface 452E on the opposite side of the upper intersection surface 451E.
- the upper intersection surface 451E and the lower intersection surface 452E create a tapered shape that narrows toward the lens portion 410E. In FIG. 16, the taper angle created by the upper intersection surface 451E and the lower intersection surface 452E is represented by using the symbol “ ⁇ 3”.
- the detection lens 400E may be inserted into the lens holder 500 described with reference to FIG. 3A.
- the taper angle “ ⁇ 2” and the taper angle “ ⁇ 3” may be set in a range of 1 ° to 6 °. If the detection lens 400E has the taper angles “ ⁇ 2” and “ ⁇ 3” within this angular range, the detection lens 400E is easily molded using a known resin molding technique.
- the distance between the first surface 421 and the second surface 422B (that is, the thickness dimension of the flange portion 420E in the z-axis direction) is represented using the symbol “Z1”.
- the thickness dimension “Z1” of the flange portion 420E and the thickness dimension “W3” of the flange chamber 520 take into account the positional variation of the flange portion 420E in the flange chamber 520 and the rotation of the flange portion 420E around the y-axis.
- It may be appropriately set (for example, a range in which the position variation of the flange portion 420E in the flange chamber 520 and the rotation of the flange portion 420E around the y axis do not significantly deteriorate the performance of the detection lens 400E). If these dimension values “Z1” and “W3” are set to appropriate values, the inclination of the detection lens 400E is within an allowable range.
- the dimension value “Y2” described with reference to FIG. 2 may be set in the range of 3.5 mm to 4.5 mm.
- the dimension values “Z1” and “W3” may be set so that the relationship represented by the following inequality is established.
- the rotation of the detection lens 400E around the y-axis is roughly within the range of 1 ° to 2 °. If the rotation of the detection lens 400E around the y-axis falls within this rotation range, the performance of the optical pickup device 100 is maintained at a high level.
- the various lens units described above are suitably mounted on the optical pickup device 100 described with reference to FIG.
- the various lens units described above may be mounted on other optical pickup devices. If a lens unit constructed according to the principles of the various embodiments described above is mounted for focus control according to the astigmatism method, the information processing (recording and / or recording) can be performed under the various advantageous effects described above. (Or reproduction) is performed.
- the optical pickup device 100 described with reference to FIG. 1 includes an optical disk (BD) 210, an optical disk (DVD) 220, and an optical disk (CD) 230. These optical pickup devices 100 can perform optical information processing on all of them.
- BD optical disk
- DVD optical disk
- CD optical disk
- These optical pickup devices 100 can perform optical information processing on all of them.
- the principles of the various embodiments described above can be applied to other optical pickup devices that support BDs that require high accuracy for the detection lens and that selectively support DVDs and CDs.
- the principle may be applied.
- the above-described principle can be suitably used for an optical pickup device compatible with BD and DVD.
- the detection lens described in connection with the various embodiments described above has a substantially point-symmetric shape. Therefore, the detection lens is simply molded by the resin molding technique. In addition, the resulting detection lens can have a high level of performance. The operator can correctly incorporate the detection lens into the optical pickup device without excessive caution. Since the detection lens has sufficient robustness even in an environment in which a temperature change occurs or an environment in which an impact is applied, the position of the detection lens can maintain high accuracy. Therefore, the principle of the various embodiments described above contributes to inexpensive manufacturing of the optical pickup device and can improve the performance of the optical pickup device.
- FIG. 17 is a schematic diagram of an optical disc apparatus 700 according to the seventh embodiment.
- An optical disc apparatus 700 will be described with reference to FIGS.
- symbol is attached
- the description relevant to 1st Embodiment is used with respect to the element to which the same code
- the optical disc device 700 includes an optical pickup device 100, a drive unit 710 that drives the optical disc (BD) 210, and a control unit 720 that controls the optical pickup device 100 and the drive unit 710.
- the optical disk (BD) 210 shown in FIG. 17 may be replaced with an optical disk (DVD) 220 or an optical disk (CD) 230.
- the drive unit 710 may be a motor that rotates the optical disc (BD) 210.
- the control unit 720 processes a control signal generated by the optical pickup device 100 and an information signal including information that is an information processing target using the optical pickup device 100.
- the control unit 720 also functions as an interface for communicating information signals between the external device and the optical disc device 700.
- the optical pickup device 100 mounted on the optical disc device 700 has a light source that can handle a plurality of optical discs, so that the optical disc device 700 suitably reproduces information from each optical disc. be able to.
- the optical disc device 700 can suitably record information on each optical disc.
- FIG. 18 is a schematic diagram of a computer 750 according to the eighth embodiment.
- the computer 750 is described with reference to FIGS. 17 and 18.
- symbol is attached
- the description relevant to 7th Embodiment is used with respect to the element to which the same code
- the computer 750 includes an optical disk device 700, an input device 760, an arithmetic device 770, and an output device 780.
- FIG. 18 illustrates a keyboard as the input device 760.
- a mouse or touch panel may be used as the input device 760.
- a user can input information into the computer 750 using the input device 760.
- the input device 760 may output information input to the arithmetic device 770.
- the input device 760 is exemplified as the input unit.
- the arithmetic device 770 performs arithmetic processing on the information input through the input device 760.
- the optical disk device 700 performs arithmetic processing on the reproduction information reproduced from the optical disk.
- the arithmetic device 770 outputs the calculation result obtained from the arithmetic processing to the output device 780.
- arithmetic unit 770 a central arithmetic unit (CPU) provided in a general computer is exemplified.
- the arithmetic device 770 is exemplified as the arithmetic unit.
- the output device 780 displays information input through the input device 760, playback information reproduced from the optical disc by the optical disc device 700, and computation results output from the computation device 770.
- Examples of the output device 780 include various devices such as a cathode ray tube, a liquid crystal display device, a display device using an organic EL element, a plasma display device, and a printer. In the present embodiment, the output device 780 is exemplified as the output unit.
- the computer 750 includes the optical disc device 700 described in relation to the seventh embodiment, the computer 750 can suitably perform recording processing and / or playback processing on different types of optical discs. Therefore, the computer 750 can be used for various purposes.
- FIG. 19 is a schematic diagram of an optical disc player 800 according to the ninth embodiment.
- the optical disc player 800 will be described with reference to FIGS. 17 and 19.
- symbol is attached
- the description relevant to 7th Embodiment is used with respect to the element to which the same code
- the optical disc player 800 includes an optical disc device 700 and a conversion device 810.
- the optical disc device 700 may reproduce information from the optical disc and output it to the conversion device 810.
- the conversion device 810 converts the information signal output from the optical disc device 700 into an image signal. That is, the information stored on the optical disk is converted into image information by the conversion device 810.
- a general decoder may be used as the conversion device 810.
- the conversion device 810 is exemplified as an image information generation unit.
- the optical disc player 800 may be provided with a position sensor (not shown) such as GPS and a central processing unit (CPU: not shown). If the optical disc player 800 includes a position sensor and a central processing unit, the optical disc player 800 can also be used as a car navigation system.
- a position sensor such as GPS and a central processing unit (CPU: not shown).
- CPU central processing unit
- the optical disc player 800 may include a display device 820 such as a liquid crystal monitor.
- the display device 820 may display reproduction information and other information reproduced from the optical disc by the optical disc device 700.
- the optical disc player 800 includes the optical disc device 700 described in relation to the seventh embodiment, the optical disc player 800 can suitably perform recording processing and / or playback processing on different types of optical discs. Therefore, the optical disc player 800 can be used for various purposes.
- FIG. 20 is a schematic diagram of an optical disc recorder 850 according to the tenth embodiment.
- the optical disk recorder 850 will be described with reference to FIGS. 17 and 20.
- symbol is attached
- the description relevant to 7th Embodiment is used with respect to the element to which the same code
- the optical disc recorder 850 includes an optical disc device 700, a first conversion device 860, a second conversion device 870, and an output device 880.
- the first conversion device 860 converts the image information into an information signal.
- the optical disc device 700 records the information signal output from the first conversion device 860 on the optical disc.
- a general encoder may be used as the first conversion device 860.
- the first conversion device 860 is exemplified as the information signal generation unit.
- the optical disc device 700 may perform a reproduction process on the optical disc and output a reproduction signal to the second conversion device 870.
- the second conversion device 870 converts the reproduction signal into image information and outputs the image information to the output device 880. As a result, the image information recorded on the optical disc is appropriately reproduced.
- the second conversion device 870 may be a general decoder.
- Examples of the output device 880 include various devices such as a cathode ray tube, a liquid crystal display device, a display device using an organic EL element, a plasma display device, and a printer.
- the optical disc recorder 850 includes the optical disc apparatus 700 described in relation to the seventh embodiment, the optical disc recorder 850 can suitably perform recording processing and / or playback processing on different types of optical discs. Therefore, the optical disk recorder 850 can be used for various purposes.
- the detection lens includes a flange portion including a lens portion, a first surface to which the lens portion is connected, and a second surface opposite to the first surface.
- the flange portion includes a base portion disposed along the optical axis of the lens portion, a first projecting portion projecting along a first axis orthogonal to the optical axis, and the first projecting portion A second projecting portion projecting from the base portion under a point-symmetrical relationship around the optical axis, a third projecting portion projecting along the second axis perpendicular to the optical axis and the first axis,
- the third protrusion includes a fourth protrusion that protrudes from the base under a point-symmetrical relationship around the optical axis.
- the flange portion does not have a portion protruding beyond the second surface.
- the first protrusion includes a first intersecting surface that intersects the first axis.
- the second protrusion includes a second intersecting surface that intersects the first axis.
- the third protrusion includes a third intersecting surface that intersects the second axis.
- the fourth protrusion includes a fourth intersecting surface that intersects the second axis. The first distance between the first intersection plane and the second intersection plane is longer than the second distance between the third intersection plane and the fourth intersection plane.
- the lens portion since the lens portion is connected to the first surface, the lens portion protrudes from the first surface.
- the flange portion does not have a portion protruding beyond the second surface. Therefore, the operator can correctly install the detection lens with respect to the direction in the direction along the optical axis.
- the second protrusion protrudes from the base under a point-symmetric relationship with the first protrusion around the optical axis.
- the fourth protruding portion protrudes from the base portion under point symmetry around the optical axis with respect to the third protruding portion. Since the first distance between the first crossing surface and the second crossing surface is longer than the second distance between the third crossing surface and the fourth crossing surface, the operator can determine the rotational position around the optical axis.
- the detection lens can be correctly installed.
- the flange portion may include a gate portion protruding from the first intersecting surface or the second intersecting surface.
- the flange portion since the flange portion includes the gate portion protruding from the first intersecting surface or the second intersecting surface, it is not necessary to completely remove the gate portion generated in the molding process of the detection lens. Therefore, the manufacturing process of the detection lens is simplified.
- the lens unit may include a first lens surface that provides astigmatism.
- the lens unit since the lens unit includes the first lens surface that gives astigmatism, various optical data are acquired using the astigmatism of the first lens surface.
- the first lens surface has a first curvature in a direction along the generatrix of the first lens surface, and has a second curvature different from the first curvature in a direction orthogonal to the generatrix. May be.
- the base portion may include an opposite surface opposite to the first lens surface.
- the opposite surface may include a second lens surface having the same optical axis as the lens unit.
- a lens unit includes the above-described detection lens and a lens holder that holds the detection lens.
- the lens holder includes a wall portion that defines a first insertion space into which the flange portion is inserted and a second insertion space into which the lens portion is inserted.
- the first distance is Y1
- the second distance is X1
- the width of the lens portion on the first axis is Da
- the width of the second insertion space on the first axis is W1. If the width of the second insertion space on the first axis is W2, the relationship represented by the inequality Y1> W1> X1> W2> Da is satisfied.
- a lens unit includes the above-described detection lens and a lens holder that holds the detection lens.
- the lens holder includes a wall portion that defines a first insertion space into which the flange portion is inserted and a second insertion space into which the lens portion is inserted, and the flange portion in the first insertion space.
- a first pedestal portion projecting toward the first pedestal portion, and a second pedestal portion defining a space in which the gate portion is inserted in cooperation with the first pedestal portion.
- the first distance is Y1
- the second distance is X1
- the width of the lens portion on the first axis is Da
- the width of the second insertion space on the first axis is W1.
- the first pedestal portion includes a first facing surface facing the gate portion.
- the second pedestal portion includes a second facing surface facing the gate portion.
- the distance between the first facing surface and the second facing surface is We, the protruding amount of the first pedestal portion and the second pedestal portion in the first insertion period is Wh, and the first If the amount of protrusion of the gate portion from the intersecting surface or the second intersecting surface is Dh, the relationship represented by the inequality We> De and the relationship inequality represented by Wh> Dh are satisfied.
- the first projecting portion extends from the third projecting portion toward the first intersecting surface, and cooperates with the first intersecting surface to define a first projecting surface that defines a first corner portion.
- the second projecting portion may include a second projecting surface that extends from the fourth projecting portion toward the second intersecting surface and defines a second corner in cooperation with the second intersecting surface. If the distance between the first corner and the second corner is represented by D1, the inequality relationship of D1> W1 may be satisfied.
- the third projecting portion extends from the first projecting portion toward the third intersecting surface, and cooperates with the third intersecting surface to define a third projecting surface that defines a third corner portion. May be included. If the distance between the second corner and the third corner is represented by D2, the inequality relationship of D2> W1 may be satisfied.
- the lens unit is surrounded by the first bonding space, the first protruding portion, the fourth protruding portion, and the wall portion surrounded by the first protruding portion, the third protruding portion, and the wall portion.
- An adhesive applied in at least one of the two bonding spaces may be further included.
- the lens unit since the adhesive is applied in at least one of the first adhesive space and the second adhesive space, the lens unit has high mechanical strength.
- the flange portion may include at least one of a curved corner portion and a corner portion subjected to C-surface treatment.
- the flange portion includes at least one of the curved corner portion and the C-surface treated corner portion, so that damage such as chipping at the corner portion is less likely to occur.
- the flange portion may have a tapered shape that narrows toward the lens portion. If the thickness dimension of the flange portion in the direction along the optical axis is represented by Z1, and the thickness dimension of the first insertion space in the direction along the optical axis is represented by W3, 0 ⁇ W3. The relationship represented by the inequality ⁇ Z1 ⁇ 0.1 mm may be satisfied.
- the flange portion since the flange portion has a tapered shape that narrows toward the lens portion, the flange portion is easily resin-molded. Since the relationship represented by the inequality of 0 ⁇ W3-Z1 ⁇ 0.1 mm is satisfied, the operator can insert the detection lens into the lens holder with high accuracy.
- An optical pickup device includes the above-described lens unit and an optical base that supports the lens unit.
- the lens unit is placed on the optical base.
- the optical pickup device since the optical pickup device includes the above-described lens unit placed on the optical base, the optical pickup device can accurately perform information processing.
- the lens unit may be formed integrally with the optical base.
- the optical pickup device can accurately perform information processing.
- An optical disc apparatus includes the above-described optical pickup device, a drive unit that rotationally drives an information recording medium, and a control unit that controls the optical pickup device and the drive unit. Prepare.
- the optical disc apparatus since the optical disc apparatus includes the above-described optical pickup device, the optical disc apparatus can accurately perform information processing.
- a computer includes at least one of the above-described optical disc device, an input unit to which information is input, reproduction information reproduced from the optical disc device, and input information input through the input unit.
- a calculation unit that performs a calculation based on the one information and outputs a calculation result; and an output unit that outputs at least one of the reproduction information, the input information, and the calculation result.
- the computer since the computer includes the above-described optical disc device, the computer can accurately perform information processing.
- An optical disc player includes the above-described optical disc device and an image information generation unit that converts an information signal output from the optical disc device into image information.
- the image information generation unit can appropriately convert the information signal output from the optical disc device into image information.
- An optical disc recorder includes the above-described optical disc device and an information signal generation unit that converts the image information into an information signal for recording image information using the optical disc device.
- the information signal generation unit can appropriately convert the information signal into an information signal for recording image information.
- the principles of the various embodiments described above are particularly preferably applied to an optical disc such as a BD.
- the principle described above can contribute to good recording and good reproduction.
- the structure of the optical pickup device is greatly simplified. Therefore, the productivity of the optical pickup device is improved. This results in an inexpensive optical disc device.
- the optical disc apparatus based on the principles of the various embodiments described above can be mounted on various apparatuses such as a computer, an optical disc player, and an optical disc recorder. These apparatuses can also perform a recording process and / or a reproduction process for each of different types of optical disks. Accordingly, the principles of the various embodiments described above are applicable to a wide range of applications.
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Abstract
Description
(光ピックアップ装置)
図1は、光ピックアップ装置100の概略的な斜視図である。図1を参照して、光ピックアップ装置100が説明される。
図1を参照して、検出レンズ300が説明される。
図3Aは、上述の検出レンズ400を保持するレンズホルダ500の概略的な平面図である。図3Bは、レンズホルダ500の概略的な正面図である。図2A乃至図3Bを参照して、レンズホルダ500が説明される。
図4Aは、レンズユニット600の概略的な平面図である。図4Bは、レンズユニット600の概略的な正面図である。図5Aは、図4Bに示されるB-B線に沿うレンズユニット600の概略的な断面図である。図5Bは、図4Aに示されるA-A線に沿うレンズユニット600の概略的な断面図である。図2A、図3A、図4A乃至図5Bを参照して、レンズユニット600が説明される。
図2A及び図3Aを参照して、フランジ室520の幅寸法「W1」とフランジ部420の対角寸法との関係が説明される。
図1、図2A及び図5Bを参照して、レンズホルダ500への検出レンズ400の固定が説明される。
図1及び図2Aを参照して、検出レンズ400の材質が説明される。
図7Aは、第2実施形態のレンズユニット600Aの概略的な平面図である。図7Bは、レンズユニット600Aの概略的な正面図である。図7A及び図7Bを参照して、レンズユニット600Aが説明される。尚、第1実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第1実施形態に関連する説明が援用される。
図9Aは、第3実施形態の検出レンズ400Bの概略的な正面図である。図9Bは、図9Aに示されるC-C線に沿う検出レンズ400Bの概略的な断面図である。図9Cは、検出レンズ400Bの概略的な背面図である。図1、図9A乃至図9Cを参照して、検出レンズ400Bが説明される。尚、第1実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第1実施形態に関連する説明が援用される。
(検出レンズ)
図10Aは、第4実施形態の検出レンズ400Cの概略的な正面図である。図10Bは、図10Aに示されるC-C線に沿う検出レンズ400Cの概略的な断面図である。図1、図10A及び図10Bを参照して、検出レンズ400Cが説明される。尚、第1実施形態及び第3実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第3実施形態に関連する説明が援用される。
図11Aは、上述の検出レンズ400Cを保持するように設計されたレンズホルダ500Cの概略的な平面図である。図11Bは、レンズホルダ500Cの概略的な正面図である。図10A乃至図11Bを参照して、レンズホルダ500Cが説明される。
図12は、レンズユニット600Cの概略的な正面図である。図10A及び図12を参照して、レンズユニット600Cが説明される。
図14A乃至図14Dは、レンズホルダ500Cの概略的な平面図である。図14A乃至図14Dを参照して、台座部(右台座部536及び左台座部537)に関する様々な設計が説明される。
図14Aは、台座部に関する第1設計パターンを表す。右台座部536及び左台座部537は、下隣接面522から突出する円柱であってもよい。
図14Bは、台座部に関する第2設計パターンを表す。右台座部536及び左台座部537は、下隣接面522から突出する矩形柱であってもよい。
図14Cは、台座部に関する第3設計パターンを表す。右台座部536及び左台座部537は、下隣接面522から突出する長円柱であってもよい。
図14Dは、台座部に関する第4設計パターンを表す。右台座部536及び左台座部537は、下隣接面522から内底面512まで延びるリブであってもよい。
図15は、第5実施形態の検出レンズ400Dの概略的な正面図である。図15を参照して、検出レンズ400Dが説明される。尚、第4実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第4実施形態に関連する説明が援用される。
図16は、第6実施形態の検出レンズ400Eの概略的な正面図である。図1、図3A及び図16を参照して、検出レンズ400Eが説明される。尚、第1実施形態、第3実施形態及び第5実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第1実施形態、第3実施形態及び第5実施形態に関連する説明が援用される。
(光ディスク装置)
図17は、第7実施形態の光ディスク装置700の概略図である。図1及び図17を参照して、光ディスク装置700が説明される。尚、第1実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第1実施形態に関連する説明が援用される。
(コンピュータ)
図18は、第8実施形態のコンピュータ750の概略図である。図17及び図18を参照して、コンピュータ750が説明される。尚、第7実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第7実施形態に関連する説明が援用される。
(光ディスクプレーヤ)
図19は、第9実施形態の光ディスクプレーヤ800の概略図である。図17及び図19を参照して、光ディスクプレーヤ800が説明される。尚、第7実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第7実施形態に関連する説明が援用される。
(光ディスクレコーダ)
図20は、第10実施形態の光ディスクレコーダ850の概略図である。図17及び図20を参照して、光ディスクレコーダ850が説明される。尚、第7実施形態と同一の要素に対して、同一の符号が付されている。同一の符号が付された要素に対して、第7実施形態に関連する説明が援用される。
Claims (18)
- レンズ部と、
該レンズ部が接続される第1面と、該第1面とは反対側の第2面と、を含むフランジ部と、を備え、
該フランジ部は、前記レンズ部の光軸に沿って配置された基部と、前記光軸に対して直交する第1軸に沿って突出する第1突出部と、該第1突出部とは前記光軸周りに点対称の関係の下、前記基部から突出する第2突出部と、前記光軸及び前記第1軸に対して直交する第2軸に沿って突出する第3突出部と、該第3突出部とは前記光軸周りに点対称の関係の下、前記基部から突出する第4突出部と、を含み、
前記フランジ部は、前記第2面を超えて突出する部分を有さず、
前記第1突出部は、前記第1軸に交差する第1交差面を含み、
前記第2突出部は、前記第1軸に交差する第2交差面を含み、
前記第3突出部は、前記第2軸に交差する第3交差面を含み、
前記第4突出部は、前記第2軸に交差する第4交差面を含み、
前記第1交差面と前記第2交差面との間の第1距離は、前記第3交差面と前記第4交差面との間の第2距離よりも長いことを特徴とする検出レンズ。 - 前記フランジ部は、前記第1交差面又は前記第2交差面から突出するゲート部を含むことを特徴とする請求項1に記載の検出レンズ。
- 前記レンズ部は、非点収差を与える第1レンズ面を含むことを特徴とする請求項1又は2に記載の検出レンズ。
- 前記第1レンズ面は、該第1レンズ面の母線に沿う方向において、第1曲率を有し、前記母線と直交する方向において、前記第1曲率とは異なる第2曲率を有することを特徴とする請求項3に記載の検出レンズ。
- 前記基部は、前記第1レンズ面とは反対側の反対面を含み、
該反対面は、前記レンズ部と同一の光軸を有する第2レンズ面を含むことを特徴とする請求項4に記載の検出レンズ。 - 請求項1に記載の検出レンズと、
該検出レンズを保持するレンズホルダと、を備え、
該レンズホルダは、前記フランジ部が挿入される第1挿入空間と、前記レンズ部が挿入される第2挿入空間と、を規定する壁部を含み、
前記第1距離がY1であり、前記第2距離がX1であり、前記第1軸における前記レンズ部の幅寸法がDaであり、前記第1軸における前記第2挿入空間の幅がW1であり、前記第1軸における前記第2挿入空間の幅がW2であるならば、Y1>W1>X1>W2>Daの不等式で表される関係が満たされることを特徴とするレンズユニット。 - 請求項2に記載の検出レンズと、
該検出レンズを保持するレンズホルダと、を備え、
該レンズホルダは、前記フランジ部が挿入される第1挿入空間と、前記レンズ部が挿入される第2挿入空間と、を規定する壁部と、前記第1挿入空間内において、前記フランジ部に向けて突出する第1台座部、該第1台座部と協働して前記ゲート部が挿入される空間を規定する第2台座部と、を含み、
前記第1距離がY1であり、前記第2距離がX1であり、前記第1軸における前記レンズ部の幅寸法がDaであり、前記第1軸における前記第2挿入空間の幅がW1であり、前記第1軸における前記第2挿入空間の幅がW2であるならば、Y1>W1>X1>W2>Daの不等式で表される関係が満たされ、
前記第1台座部は、前記ゲート部に対向する第1対向面を含み、
前記第2台座部は、前記ゲート部に対向する第2対向面を含み、
前記第1対向面と前記第2対向面との間の距離がWeであり、前記第1挿入間内における前記第1台座部及び前記第2台座部の突出量がWhであり、前記第1交差面又は前記第2交差面からの前記ゲート部の突出量がDhであるならば、We>Deの不等式で表される関係及びWh>Dhで表される不等式の関係が満たされることを特徴とするレンズユニット。 - 前記第1突出部は、前記第3突出部から前記第1交差面に向けて延び、前記第1交差面と協働して第1角隅部を規定する第1突出面を含み、
前記第2突出部は、前記第4突出部から前記第2交差面に向けて延び、前記第2交差面と協働して第2角隅部を規定する第2突出面を含み、
前記第1角隅部と前記第2角隅部との間の距離がD1で表されるならば、D1>W1の不等式の関係が満たされることを特徴とする請求項7に記載のレンズユニット。 - 前記第3突出部は、前記第1突出部から前記第3交差面に向けて延び、前記第3交差面と協働して第3角隅部を規定する第3突出面を含み、
前記第2角隅部と前記第3角隅部との間の距離がD2で表されるならば、D2>W1の不等式の関係が満たされることを特徴とする請求項8に記載のレンズユニット。 - 前記第1突出部、前記第3突出部及び前記壁部によって囲まれる第1接着空間及び前記第1突出部、前記第4突出部及び前記壁部によって囲まれる第2接着空間のうち少なくとも一方内に塗布された接着剤を更に含むことを特徴とする請求項6又は7に記載のレンズユニット。
- 前記フランジ部は、湾曲した角隅部及びC面処理された角隅部のうち少なくとも一方を含むことを特徴とする請求項6又は7に記載のレンズユニット。
- 前記フランジ部は、前記レンズ部に向かって狭まるテーパ形状をなし、
前記光軸に沿う方向における前記フランジ部の厚さ寸法がZ1で表され、且つ、前記光軸に沿う方向における前記第1挿入空間の厚さ寸法がW3で表されるならば、0≦W3-Z1<0.1mmの不等式で表される関係が満たされることを特徴とする請求項6又は7に記載のレンズユニット。 - 請求項6乃至12のいずれか1項に記載のレンズユニットと、
該レンズユニットを支持する光学基台と、を備え、
前記レンズユニットは、前記光学基台上に載置されることを特徴とする光ピックアップ装置。 - 前記レンズユニットは、前記光学基台に一体的に形成されることを特徴とする請求項13に記載の光ピックアップ装置。
- 請求項13又は14に記載の光ピックアップ装置と、
情報記録媒体を回転駆動する駆動部と、
前記光ピックアップ装置と前記駆動部と、を制御する制御部と、を備えることを特徴とする光ディスク装置。 - 請求項15に記載の光ディスク装置と、
情報が入力される入力部と、
前記光ディスク装置から再生された再生情報及び前記入力部を通じて入力された入力情報のうち少なくとも一方の情報に基づいて、演算を行い、演算結果を出力する演算部と、
前記再生情報、前記入力情報及び前記演算結果のうち少なくとも1つを出力する出力部と、を備えることを特徴とするコンピュータ。 - 請求項15に記載の光ディスク装置と、
該光ディスク装置が出力した情報信号を画像情報に変換する画像情報生成部と、を備えることを特徴とする光ディスクプレーヤ。 - 請求項15に記載の光ディスク装置と、
該光ディスク装置を用いて画像情報を記録するための情報信号に変換する情報信号生成部と、を備えることを特徴とする光ディスクレコーダ。
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