WO2013080879A1 - Optical pickup device - Google Patents

Optical pickup device Download PDF

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Publication number
WO2013080879A1
WO2013080879A1 PCT/JP2012/080285 JP2012080285W WO2013080879A1 WO 2013080879 A1 WO2013080879 A1 WO 2013080879A1 JP 2012080285 W JP2012080285 W JP 2012080285W WO 2013080879 A1 WO2013080879 A1 WO 2013080879A1
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WO
WIPO (PCT)
Prior art keywords
axis
objective lens
pickup device
optical pickup
reflecting member
Prior art date
Application number
PCT/JP2012/080285
Other languages
French (fr)
Japanese (ja)
Inventor
幸一 竹沢
Original Assignee
三洋電機株式会社
三洋オプテックデザイン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社, 三洋オプテックデザイン株式会社 filed Critical 三洋電機株式会社
Publication of WO2013080879A1 publication Critical patent/WO2013080879A1/en

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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
    • G11B7/1362—Mirrors
    • 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
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B2007/0003—Recording, reproducing or erasing systems characterised by the structure or type of the carrier
    • G11B2007/0006—Recording, reproducing or erasing systems characterised by the structure or type of the carrier adapted for scanning different types of carrier, e.g. CD & DVD
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—Objective lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1376—Collimator lenses
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1392—Means for controlling the beam wavefront, e.g. for correction of aberration
    • G11B7/13925—Means for controlling the beam wavefront, e.g. for correction of aberration active, e.g. controlled by electrical or mechanical means

Definitions

  • the present invention relates to a compatible optical pickup device using a plurality of objective lenses.
  • an optical pickup device that can handle different types of optical disks.
  • compatible optical pickup devices that are compatible with CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray Disc) have been developed.
  • two objective lenses can be arranged in order to realize different numerical apertures.
  • the optical pickup device is equipped with two optical systems (for example, Patent Document 1).
  • Each of the two optical systems includes a laser light source, a rising mirror, and an objective lens. Laser beams emitted from the two laser light sources are respectively guided to corresponding objective lenses by corresponding rising mirrors.
  • the present invention has been made in view of such a problem, and an object of the present invention is to provide an optical pickup device capable of realizing miniaturization of the optical pickup device while properly accommodating different optical systems.
  • the first aspect of the present invention relates to an optical pickup device.
  • An optical pickup device includes a first laser light source that emits a first laser light, a second laser light source that emits a second laser light, and the first laser light to a first disk.
  • a first objective lens that converges on the second disk, and a second laser beam that converges the second laser light on the second disk and that is disposed closer to the inner periphery of the second disk than the first objective lens.
  • Objective plate and a plate-like first reflection that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens.
  • the second laser light incident along the second incident axis and along the second incident axis inclined from the first incident axis in an in-plane direction of a plane perpendicular to the member and the first emission axis A plate-like second reflecting member that reflects in the direction and enters the second objective lens; Provided.
  • the first reflecting member has a shape in which an edge adjacent to the second reflecting member is separated from the second emission axis.
  • the second reflecting member is formed.
  • the second laser light reflected along the emission axis is less likely to be blocked by the first reflecting member.
  • the 1st reflective member can be made to approach the 2nd reflective member, and an optical system can be installed so that the 1st and 2nd outgoing axis may be brought close to each other. Thereby, size reduction of an optical pick-up apparatus is realizable.
  • the first reflecting member may have a shape in which a side surface adjacent to the second reflecting member of a rectangular parallelepiped having a predetermined thickness is cut into a flat shape.
  • the first reflecting member has a parallelogram outline. If it carries out like this, a 1st reflective member can be acquired by cutting out easily from a raw plate without waste, and the cost of a 1st reflective member can be held down.
  • the first reflecting member is rotated in such a manner that an edge of the first reflecting member placed on the installation surface of the housing accommodating the optical system is separated from the second emission axis. It can be set as the structure installed in the said installation surface. If it carries out like this, the 2nd laser beam reflected along the 2nd output axis will become still more difficult to be interrupted by the 1st reflective member. As a result, the optical system can be installed so that the first and second emission axes can be brought closer to each other.
  • the optical pickup device advances along the second incident axis.
  • the first reflecting member may be installed on the installation surface so as to enter a gap between the light beam portion of the second laser beam and the installation surface. If it carries out like this, the 1st and 2nd reflection member can be installed, without the edge part of a 1st reflection member interrupting
  • a recess having a thin side wall is formed on a side wall that forms a boundary on the inner peripheral side of the first and second disks of the housing that houses the optical system.
  • the second reflecting member may be installed in the housing so as to be accommodated in the recess.
  • the first disc may be a Blu-ray disc
  • the second disc may be a digital bar sail disc.
  • the first objective lens is positioned at a position in accordance with the Blu-ray Disc standard.
  • the second reflecting member can be installed in a limited installation space on the inner circumference side of the disc from the first objective lens.
  • the second aspect of the present invention relates to an optical pickup device.
  • An optical pickup device includes a first laser light source that emits a first laser light, a second laser light source that emits a second laser light, and the first laser light to a first disk.
  • a first objective lens that converges on the second disk, and a second laser beam that converges the second laser light on the second disk and that is disposed closer to the inner periphery of the second disk than the first objective lens.
  • Objective plate and a plate-like first reflection that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens.
  • the second laser light incident along the second incident axis and along the second incident axis inclined from the first incident axis in an in-plane direction of a plane perpendicular to the member and the first emission axis A plate-like second reflecting member that reflects in the direction and enters the second objective lens; Provided.
  • the first reflecting member is rotated in such a manner that an edge of the first reflecting member placed on the installation surface of the housing that houses the optical system is separated from the second emission axis. , Installed on the installation surface.
  • the second laser light reflected along the second emission axis is less likely to be blocked by the first reflecting member.
  • the 1st reflective member can be made to approach the 2nd reflective member, and an optical system can be installed so that the 1st and 2nd outgoing axis may be brought close to each other. Thereby, size reduction of an optical pick-up apparatus is realizable.
  • an optical pickup device capable of realizing downsizing of the optical pickup device while appropriately accommodating different optical systems.
  • FIG. 1 is a diagram schematically illustrating an optical pickup device according to a first embodiment.
  • 1 is a diagram schematically illustrating an optical pickup device according to a first embodiment and a diagram illustrating the vicinity of a rising mirror. It is a figure explaining the shape of the raising mirror which concerns on Example 1, and a side view of the raising mirror installed in the housing. It is a figure which shows the positional relationship of a raising mirror and a light beam when a raising mirror which concerns on a comparative example is used, and a figure which shows the positional relationship of a raising mirror and a housing.
  • FIG. 10 is a diagram illustrating a rotation state of a rising mirror according to a second embodiment and a diagram illustrating the vicinity of the rising mirror. It is a side view of the raising mirror installed in the housing which concerns on Example 2.
  • FIG. FIG. 6 is a diagram illustrating a specific configuration example of an optical pickup device according to a second embodiment. It is the figure which expanded the part of the housing in which the raising mirror which concerns on Example 2 is installed. It is a figure which shows the shape of the raising mirror which concerns on the example of a change.
  • the present invention is applied to an optical pickup device that irradiates a CD (Compact Disc), a DVD (Digital Versatile Disc), and a BD (Blu-ray Disc) with laser light.
  • a CD Compact Disc
  • DVD Digital Versatile Disc
  • BD Blu-ray Disc
  • the BD objective lens is an objective lens that appropriately converges a laser beam having a wavelength of about 400 nm (hereinafter referred to as “BD light”) guided from a BD optical system corresponding to the BD onto a BD recording layer. It is.
  • the CD / DVD objective lens is a laser beam having a wavelength of about 780 nm (hereinafter referred to as “CD light”) derived from a CD / DVD optical system compatible with both CD and DVD, and a laser having a wavelength of about 650 nm. It is an objective lens that properly converges light (hereinafter referred to as “DVD light”) onto the recording layers of CD and DVD, respectively.
  • a BD objective lens and a CD / DVD objective lens are arranged in order from the center of the turntable toward the outside.
  • the center of the turntable, the BD objective lens, and the CD / DVD objective lens are aligned on the same straight line when viewed from a direction perpendicular to the disc.
  • the innermost circumferential position of the track is determined by the standard. For this reason, when the optical pickup device is positioned at the position closest to the turntable, each objective lens needs to be positioned at the innermost track position of the corresponding disk or at the inner side thereof.
  • the innermost track position of the track is the innermost side of BD among BD, DVD and CD. Therefore, the distance from the center of the turntable to the BD objective lens when the optical pickup device is positioned in the innermost direction is the distance from the center of the BD to the innermost track position of the BD (“predetermined value r”). ) It is necessary to do the following.
  • the BD objective lens is arranged so that the distance from the center of the turntable to the BD objective lens is smaller than a predetermined value r, and the BD optical system is adapted to the position of the BD objective lens.
  • the CD / DVD objective lens and the CD / DVD optical system are arranged outside the space occupied by the BD objective lens and the BD optical system.
  • the BD optical system requires a mechanism for correcting aberrations, the occupied space tends to be large. For this reason, it is difficult to secure an arrangement space for the BD optical system on the inner side than the CD / DVD optical system. If the arrangement space for the BD optical system is secured on the inner side than the CD / DVD optical system, FIG. As shown to (a), the distance from the center of a turntable to the objective lens for CD / DVD becomes large, and an optical pick-up apparatus will become large sized as a result.
  • FIG. 1B a layout in which the BD objective lens is arranged outside the CD / DVD objective lens is conceivable.
  • the BD optical system that occupies a large space can be arranged outward while the distance from the center of the turntable to the BD objective lens is set to the predetermined value r, so that the optical pickup device can be downsized. It becomes possible.
  • Examples 1 and 2 below when the BD objective lens is disposed outside the CD / DVD objective lens, the BD objective lens is disposed within a distance of a predetermined value r from the center of the turntable, An optical pickup device is shown in which a CD / DVD objective lens can be arranged between the center of a turntable and a BD objective lens.
  • FIG. 2 and 3 (a) are diagrams schematically showing an optical pickup device according to the embodiment.
  • FIG. 2 is a plan view when the optical system is viewed from the back side
  • FIG. 3A is a partial perspective view when the peripheral portion of the objective lens actuator 302 is viewed from the side surface side.
  • the optical system of the optical pickup device is divided into an optical system for BD and an optical system for CD / DVD.
  • the BD optical system and the CD / DVD optical system are housed in a housing H.
  • the optical system for BD includes a semiconductor laser 101, a diffraction grating 102, a polarizing beam splitter 103, a quarter wavelength plate 104, a collimator lens 105, a lens actuator 106, a rising mirror R1, and an objective lens for BD. 107 and a photodetector 108.
  • the semiconductor laser 101 emits BD light in the positive Y-axis direction.
  • the diffraction grating 102 splits the BD light emitted from the semiconductor laser 101 into a main beam and two sub beams.
  • the polarization beam splitter 103 reflects the laser light incident from the diffraction grating 102 side.
  • the polarizing beam splitter 103 is a thin parallel plate, and a polarizing film is formed on the incident surface thereof.
  • the semiconductor laser 101 is arranged so that the polarization direction of the BD light is S-polarized with respect to the polarization beam splitter 103.
  • the quarter wavelength plate 104 converts the BD light reflected by the polarization beam splitter 103 into circularly polarized light, and converts the reflected light from the BD into linearly polarized light that is orthogonal to the polarization direction when traveling toward the BD. As a result, the BD light reflected by the BD passes through the polarization beam splitter 103 and is guided to the photodetector 108.
  • the collimator lens 105 converts the laser light reflected by the polarization beam splitter 103 into parallel light.
  • the lens actuator 106 drives the collimator lens 105 in the optical axis direction of the collimator lens 105.
  • the lens actuator 106 includes a moving member 106a, a shaft 106b, a gear 106c, and a motor 106d.
  • the moving member 106 a holds the collimator lens 105.
  • the moving member 106 a is supported by the shaft 106 b so as to be movable in the optical axis direction of the collimator lens 105.
  • the gear 106c is connected to the drive shaft of the motor 106d and meshes with a gear (not shown) formed on the moving member 106a.
  • the collimator lens 105 held by the moving member 106a moves in the optical axis direction.
  • the aberration generated in the BD light is corrected by moving the collimator lens 105 according to the control signal.
  • the rising mirror R1 reflects the BD light incident from the collimator lens 105 side in a direction toward the BD objective lens 107.
  • the reflection region of the BD light is indicated by a broken line, and the center of the reflection region is indicated by a black circle.
  • the optical axis A11 of the BD light incident on the rising mirror R1 from the collimator lens 105 side is the X-axis direction and is indicated by a one-dot chain line.
  • the optical axis A12 of the BD light reflected by the rising mirror R1 and directed to the BD objective lens 107 is the Z-axis direction and is indicated by a one-dot chain line.
  • the BD objective lens 107 is designed so that the BD light can be properly converged on the recording layer of the BD.
  • the BD objective lens 107 is installed so that the optical axis of the BD objective lens 107 is positioned on a straight line extending in the positive direction of the Z axis from the center of the reflection region of the rising mirror R1.
  • the BD objective lens 107 is held by a holder 301, and the holder 301 is driven in a focus direction and a tracking direction by an objective lens actuator 302. By driving the holder 301 in this way, the BD objective lens 107 is driven in the focus direction and the tracking direction.
  • the reflected light from the BD is converted by the quarter wavelength plate 104 into linearly polarized light that becomes P-polarized light with respect to the polarizing beam splitter 103. Thereby, the reflected light from the BD passes through the polarization beam splitter 103.
  • the polarization beam splitter 103 is disposed so as to be inclined by 45 degrees with respect to the optical axis of the BD light. For this reason, astigmatism is introduced into the BD light transmitted through the polarization beam splitter 103 in a converged state.
  • the photodetector 108 is provided with a four-divided sensor at a position where the main beam of BD light and two sub beams are irradiated.
  • the sensor layout of the photodetector 108 is set so that a reproduction RF signal, a focus error signal, and a tracking error signal are generated by the output from each sensor.
  • the CD / DVD optical system includes a semiconductor laser 201, a half mirror 202, a rising mirror R2, a CD / DVD objective lens 203, and a photodetector 204.
  • the semiconductor laser 201 includes a laser element that outputs CD light and DVD light in one CAN, and emits CD light and DVD light in the negative X-axis direction.
  • the luminous fluxes of the CD light and the DVD light are indicated by a one-dot chain line.
  • the half mirror 202 reflects half of the laser light incident from the semiconductor laser 201 side, guides it to the rising mirror R2, and transmits half of the laser light incident from the rising mirror R2 side. To the photodetector 204.
  • the rising mirror R2 reflects the CD light and DVD light incident from the half mirror 202 side in a direction toward the CD / DVD objective lens 203.
  • the reflection area of the CD light and the DVD light is indicated by a broken line, and the center of the reflection area is indicated by a black circle.
  • the optical axis A21 of the CD light and DVD light incident on the rising mirror R2 from the half mirror 202 side is the Y-axis direction and is indicated by a one-dot chain line. Further, it is reflected by the rising mirror R2 and shown toward the CD / DVD objective lens 203.
  • the CD / DVD objective lens 203 is designed so that the CD light and the DVD light can be properly converged on the recording layers of the CD and the DVD, respectively.
  • the CD / DVD objective lens 203 is installed so that the optical axis of the CD / DVD objective lens 203 is positioned on a straight line extending in the positive direction of the Z axis from the center of the reflection region of the rising mirror R2.
  • the CD / DVD objective lens 203 is held by the holder 301.
  • the holder 301 is driven, the CD / DVD objective lens 203 is driven in the focus direction and the tracking direction. Is done.
  • the photodetector 204 is provided with a four-divided sensor at a position where CD light and DVD light are irradiated.
  • the sensor layout of the photodetector 204 is set so that a reproduction RF signal, a focus error signal, and a tracking error signal are generated by the output from each sensor.
  • the peripheral portion of the housing H (the portion indicated by hatching) is one step higher than the central portion of the housing H (higher in the Z-axis negative direction side). That is, the housing H has a so-called box shape in which the negative Z-axis direction is opened and a wall is provided around the housing H.
  • a mounting area for each member constituting the optical system is formed inside the housing H, including a partition wall extending from the bottom surface or the side wall of the housing H.
  • the BD optical system and the CD / DVD optical system are accommodated in a region surrounded by the wall of the housing H.
  • Each member constituting the optical system for BD and the optical system for CD / DVD is installed so that the bottom part is placed on the installation surface in each installation area provided in the area surrounded by the wall of the housing H. Is done.
  • the center of the turntable, the center of the reflection area of the BD light of the rising mirror R1 (the optical axis of the BD objective lens 107), and the startup The center of the reflection area of the CD light and the DVD light of the mirror R2 (the center of the optical axis of the CD / DVD objective lens 203) is positioned on the same straight line when viewed in the Z-axis direction.
  • the housing H has bearings H1 and H2. With the bearings H1 and H2 supported by a shaft (not shown), the housing H is moved inward and outward. As a result, the BD objective lens 107 and the CD / DVD objective lens 203 are moved in the radial direction of the disc.
  • the housing H has a wall on the center side of the turntable that is curved in an arc shape, and an outer wall portion H3 and an inner wall portion H4 are formed in the curved portion.
  • the outer wall portion H3 is formed in accordance with the outer peripheral shape of the turntable. That is, when the optical pickup device is positioned at the position closest to the turntable (the position in the innermost direction), the outer wall portion H3 faces the outer periphery of the turntable with a predetermined gap.
  • the rising mirror R1 and the BD objective lens 107 have a distance from the center of the turntable on the XY plane to the BD objective lens 107 in FIG.
  • the housing H is arranged so as to have a predetermined value r. For this reason, the raising mirror R2 needs to be disposed in a slight gap between the outer wall portion H3 and the raising mirror R1.
  • a concave portion H4a is formed in the inner wall portion H4 in order to arrange the rising mirror R2. That is, the thickness of the wall formed in the arc shape is reduced in accordance with the shape of the end portion in the inner direction of the rising mirror R2, thereby forming the concave portion H4a recessed in the inner direction in the inner wall portion H4. .
  • the end of the rising mirror R2 in the inner direction is positioned at the concave portion H4a.
  • the inner end of the rising mirror R2 has a shape as shown below.
  • 4 (a) and 4 (b) are diagrams for explaining the shapes of the rising mirrors R1 and R2.
  • the rising mirror R1 is made of a plate-like member having eight vertices V11 to V18.
  • the contour of the rising mirror R1 is a parallelogram. That is, the rising mirror R1 has a shape in which the vertices V11 and V12 are cut off from the rectangular parallelepiped shape indicated by the dotted line by a plane passing through the vertices V13 and V14, and further the vertices V17 and V18 are cut off by a plane passing through the vertices V15 and V16. .
  • the plane consisting of the vertices V11a, V12a, V13 and V14 and the plane consisting of the vertices V15, V16, V17a and V18a are parallel.
  • the vertex V11a is located at a position approaching the vertex V15 from the vertex V11
  • the vertex V12a is located at a position approaching the vertex V16 from the vertex V12
  • the vertex V17a is located at a position approaching the vertex V13 from the vertex V17.
  • the vertex V18a is located close to the vertex V14 from the vertex V18.
  • the reflecting surface (the surface formed by the vertices V12a, V13, V17a, and V16) and the opposite surface are parallelograms.
  • the contour of the reflecting surface and the contour of the opposite surface completely coincide.
  • the reflective surface and the opposite surface are parallel to each other.
  • the rising mirror R1 is disposed in the housing H in a state where the reflecting surface is tilted 45 degrees so that the reflecting surface faces the positive direction of the Z axis with the Y axis as the rotation axis so that the reflecting surface can sufficiently receive the light beam of BD light.
  • the rising mirror R2 is made of a plate-like member having eight vertices V21 to V28.
  • the contour of the rising mirror R2 is a parallelogram. That is, the rising mirror R2 has a shape in which the vertices V23 and V24 are cut off from a rectangular parallelepiped shape indicated by a dotted line by a plane passing through the vertices V21 and V22, and further, the vertices V25 and V26 are cut off by a plane passing through the vertices V27 and V28. .
  • the plane composed of the vertices V21, V22, V23a and V24a and the plane composed of the vertices V25a, V26a, V27 and V28 are parallel.
  • the vertex V23a is located at a position approaching the vertex V27 from the vertex V23
  • the vertex V24a is located at a position approaching the vertex V28 from the vertex V24
  • the vertex V25a is located at a position approaching the vertex V21 from the vertex V25
  • the vertex V26a is located close to the vertex V22 from the vertex V26.
  • the reflecting surface (the surface composed of the vertices V22, V23a, V27, V26a) and the opposite surface are parallelograms.
  • the contour of the reflecting surface and the contour of the opposite surface completely coincide.
  • the reflective surface and the opposite surface are parallel to each other.
  • the rising mirror R2 has a housing H in a state where the reflecting surface is tilted 45 degrees so that the reflecting surface is directed in the positive direction of the Z-axis with the X axis as a rotation axis so that the reflecting surface can sufficiently receive the light beams of CD light and DVD light Placed inside.
  • FIG. 4C is a side view when the rising mirror R1 installed in the housing H is viewed in the positive direction of the X axis.
  • the vertices V21, V22, V23a, and V24a are positioned on the X axis positive direction side of the vertices V25a, V26a, V27, and V28 of the rising mirror R2, respectively.
  • the rising mirror R1 is inclined 45 degrees so that the reflecting surface faces the positive direction of the Z axis.
  • the rising mirror R1 tilted in this way is installed on an installation surface H11 formed in the housing H. That is, the surface composed of the vertices V13, V14, V18a, and V17a of the rising mirror R1 is supported by the installation surface H11.
  • the rising mirror R1 When the rising mirror R1 is installed in this way, the BD light traveling in the positive direction of the X axis from the collimator lens 105 side is irradiated on the reflection area indicated by the thick broken line on the reflecting surface of the rising mirror R1, and the Z axis Reflected in the positive direction.
  • the upper part of the rising mirror R2 (the end on the negative side of the Z axis) is the side of the rising mirror R1 (the positive side of the Y axis). (Over the edge).
  • the raising mirror R1 is located in front of the raising mirror R2 (X-axis negative side)
  • the raising mirror R1 is raised.
  • the light beam of the BD light reflected by the reflecting surface of the mirror R1 is blocked by the rising mirror R2.
  • FIG. 4D is a side view when the rising mirror R2 installed in the housing H is viewed in the positive direction of the Y axis.
  • the vertices V15, V16, V17a, and V18a are positioned on the Y axis positive direction side of the vertices V11a, V12a, V13, and V14 of the rising mirror R1, respectively.
  • the rising mirror R2 is inclined 45 degrees so that the reflecting surface faces the positive direction of the Z axis.
  • the rising mirror R2 tilted in this way is installed on an installation surface H21 formed in the housing H. That is, the surface composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is supported by the installation surface H21.
  • the rising mirror R2 When the rising mirror R2 is installed in this way, the CD light and the DVD light traveling in the Y-axis positive direction from the half mirror 202 side are irradiated on the reflection area indicated by the thick broken line on the reflecting surface of the rising mirror R2. , Reflected in the positive direction of the Z axis.
  • the vertices V14 and V18a of the rising mirror R1 are closer to the Z-axis positive direction side (downward in FIG. 4D) than the luminous fluxes of the CD light and DVD light incident on the rising mirror R2 in the Y-axis positive direction. Is positioned. Therefore, the light fluxes of the CD light and the DVD light incident on the rising mirror R2 are not blocked by the rising mirror R1.
  • the raising mirror R1 when viewed in the positive direction of the Y axis, the lower part of the rising mirror R1 (the end on the positive side of the Z axis) is the lower part of the reflecting surface of the rising mirror R2 (the positive axis of the Z axis On the side edge). Since the raising mirror R1 is in front of the raising mirror R2 (Y-axis negative side), if the lower part of the raising mirror R1 overlaps the lower part of the reflecting surface of the raising mirror R2, the raising mirror R1 is raised. There is a possibility that CD light and DVD light reflected by the reflecting surface of the mirror R2 are blocked by the rising mirror R1. However, in the present embodiment, since the outline of the rising mirror R1 is a parallelogram as described above, CD light and DVD light reflected by the reflecting surface of the rising mirror R2 are raised as follows. It is not blocked by the mirror R1.
  • FIG. 5A is a diagram showing the positional relationship between the rising mirror R3 and the luminous fluxes of the CD light and the DVD light when the rising mirror R3 is used instead of the rising mirror R1.
  • the rising mirror R3 has a rectangular shape, and has a square outline in plan view. Further, the distance between the center of the CD light and the DVD light reflected in the Z-axis positive direction and the center of the BD light reflected in the Z-axis positive direction is the same as the distance d when the rising mirror R1 is used. It is.
  • the end on the Z-axis positive direction side of the rising mirror R3 is positioned closer to the Z-axis positive direction side than the CD light and DVD light traveling in the Y-axis positive direction, like the rising mirror R1 shown in FIG. is doing. For this reason, as in the case where the rising mirror R1 is used, the CD and DVD light traveling in the positive Y-axis direction is not blocked by the rising mirror R3. However, CD light and DVD light reflected in the positive direction of the Z-axis by the rising mirror R2 are applied to the inner end of the rising mirror R3 as shown in FIG. As a result, part of the CD light and DVD light reflected in the positive direction of the Z axis is blocked by the rising mirror R3.
  • the rising mirror R1 of this embodiment when used, the portion corresponding to the inner end of the rising mirror R3, that is, the vertices V15, V18, V18a, V16, V17 in FIG. Since there is no triangular prism portion made of V17a, CD light and DVD light reflected in the positive Z-axis direction by the rising mirror R2 are not blocked by this triangular prism portion.
  • the distance between the center position of the BD light reflected in the positive Z-axis direction and the center position of the CD light and the DVD light reflected in the positive Z-axis direction is a width d.
  • FIG. 5B is a diagram showing a positional relationship among the rising mirror R4, the outer wall portion H3, and the inner wall portion H4 when the rising mirror R4 is used instead of the rising mirror R2.
  • the rising mirror R4 has a rectangular shape, and has a square-shaped outline in plan view. Further, the distance between the center of the CD light and DVD light reflected in the positive direction of the Z axis and the outer wall H3 is the same as that when the rising mirror R2 is used.
  • the end portion of the rising mirror R4 in the inner direction protrudes inward from the outer wall portion H3 formed in accordance with the outer peripheral shape of the turntable. For this reason, as shown in FIG. 2, the recessed mirror H4a cannot be formed in the inner wall H4 and the rising mirror R4 cannot be accommodated inside the housing H.
  • the rising mirror R2 of this embodiment when used, the portion corresponding to the inner end of the rising mirror R3, that is, the vertices V21, V24, V24a, V22, V23, V23a in FIG. Since there is no triangular prism portion made of, end portions (vertices V23a, V24a) of the rising mirror R2 in the inner direction do not protrude inward from the outer wall portion H3.
  • the rising mirror R ⁇ b> 2 can be housed inside the housing H by forming a recess H ⁇ b> 4 a that is recessed inward in the inner wall portion H ⁇ b> 4.
  • the rising mirror R1 has a parallelogram shape
  • the inner end of the rising mirror R1 is moved in the positive direction of the Z axis by the rising mirror R2.
  • the reflected CD light and DVD light are separated from the optical axis A22. Therefore, compared to the case where the rising mirror R3 as shown in FIG. 5A is used, the rising mirrors R1 and R2 can be brought closer to each other, whereby the BD optical system and the CD / DVD are used.
  • the optical system can be brought close to each other. Therefore, the arrangement space of the entire optical system including the BD optical system and the CD / DVD optical system can be made compact, and as a result, the optical pickup device can be miniaturized.
  • the BD objective lens 107 is positioned outward from the CD / DVD objective lens 203 as shown in FIG. In this case, a space for arranging the inner rising mirror R2 can be widened. Thereby, as shown in FIG. 2, it is possible to secure a space for disposing the rising mirror R2 between the outer wall portion H3 and the rising mirror R1.
  • the rising mirror R2 since the rising mirror R2 has a parallelogram shape, in the installed state, the end on the turntable side of the rising mirror R2 is located more in the housing H than the outer wall H3. Can be positioned inside. That is, as compared with the case where the rising mirror R4 as shown in FIG. 5B is used, the end of the rising mirror R2 on the turntable side can be shifted in the direction away from the turntable. For this reason, this end portion of the rising mirror R2 is easily accommodated in the housing H. Furthermore, since the recess H4a is formed in the inner wall H4 of the housing H, the rising mirror R2 can be housed inside the housing H.
  • the raising mirrors R1 and R2 have a parallelogram outline, the raising mirrors R1 and R2 can be easily cut out from the original plate without waste. Thereby, it is possible to keep the production cost of the rising mirrors R1 and R2 low.
  • the raising mirrors R1 and R2 have a shape as shown in FIGS. 4A and 4B, and are arranged in the housing H so that the reflection surface is inclined by 45 degrees.
  • the rising mirrors R1 and R2 are further disposed on the housing H in a state rotated from the state of the first embodiment by a predetermined angle about the direction perpendicular to the reflecting surface as the central axis.
  • the raising mirrors R1 and R2 are rotated by a predetermined angle from the state shown in FIG. Specifically, as shown in FIG. 6A, the rising mirror R1 is rotated by a predetermined angle around a straight line that passes through the center of the reflecting surface and is perpendicular to the reflecting surface. This rotation direction is counterclockwise when the rising mirror R1 is viewed from the surface opposite to the reflecting surface. As shown in FIG. 6B, the rising mirror R2 passes through the center of the reflecting surface and is rotated by a predetermined angle around a straight line perpendicular to the reflecting surface. This rotation direction is clockwise when the rising mirror R2 is viewed from the surface opposite to the reflecting surface.
  • FIG. 6C is a view showing the vicinity of the rising mirrors R1 and R2 of the present embodiment.
  • FIG. 6C shows the housing in the inner direction of the rising mirror R2 together with the rising mirrors R1 and R2 rotated as shown in FIGS. 6A and 6B from the state of the first embodiment. H is shown.
  • the raising mirror R1 When the raising mirror R1 is rotated in this way, the apex angles V17a and V18a of the raising mirror R1 are further reflected in the Z-axis positive direction as compared with the case of the first embodiment. Will leave. Therefore, the CD / DVD light reflected by the rising mirror R2 is less likely to be blocked by the end portions (vertical angles V17a and V18a) of the rising mirror R1 than in the case of the first embodiment. As a result, the CD / DVD optical system can be positioned outward by the width ⁇ d as compared with the first embodiment.
  • the apex angles V23a and V24a of the raising mirror R2 are further away from the outer wall H3 as compared with the case of the first embodiment.
  • the thickness of the part of the wall in which the recessed part H4a was formed in the inner wall part H4 can be enlarged, and the intensity
  • FIG. 7A is a side view of the rising mirror R1 installed in the housing H when viewed in the positive direction of the X axis.
  • the rising mirror R1 passes through the center of the reflecting surface and is rotated by a predetermined angle around a straight line perpendicular to the reflecting surface.
  • the rising mirror R1 thus rotated is installed on an installation surface H12 formed in the housing H. That is, the surface composed of the vertices V13, V14, V18a, and V17a of the rising mirror R1 is supported by the installation surface H12.
  • FIG. 7B is a side view of the rising mirror R2 installed in the housing H when viewed in the positive direction of the Y axis.
  • the rising mirror R2 passes through the center of the reflecting surface and is rotated around a straight line that is absorbed by the reflecting surface.
  • the rising mirror R2 thus rotated is installed on an installation surface H22 formed in the housing H. That is, the surface composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is supported by the installation surface H22.
  • the vertex V18a of the rising mirror R1 is closer to the Z-axis positive direction side (downward in FIG. 7D) than the luminous fluxes of the CD light and the DVD light incident on the rising mirror R2 in the Y-axis positive direction. It is positioned.
  • FIG. 8 is a diagram showing a specific configuration example of the optical pickup device in the present embodiment.
  • FIG. 8 is a perspective view of the optical pickup device as viewed from the back side.
  • the optical pickup device shown in FIG. 8 is substantially the same as the configuration shown in FIG. 2 except for the vicinity of the rising mirrors R1 and R2 as shown in FIG.
  • the diffraction grating 102 is fixed in the housing H by the holder 102a.
  • a cover is installed in the housing H.
  • the BD objective lens 107, the CD / DVD objective lens 203, the holder 301, and the objective lens actuator 302 are mounted on the front side of the housing H.
  • the traveling direction of the BD light incident on the rising mirror R1 from the collimator lens 105 side is slightly shifted in the XY plane from the positive X-axis direction shown in FIG.
  • the traveling directions of the CD light and the DVD light incident on the rising mirror R2 from the half mirror 202 side are slightly shifted in the XY plane from the Y axis positive direction shown in FIG.
  • FIGS. 9A and 9B are enlarged views of a portion of the housing H where the rising mirrors R1 and R2 are installed.
  • the installation surface H12 shown in FIG. 7A is formed with a protruding surface H12a which is parallel to the installation surface H12 and slightly raised.
  • the housing H is provided with installation surfaces H13 and H14 for supporting the reflecting surface of the rising mirror R1.
  • On the installation surfaces H13 and H14 there are formed projecting surfaces H13a and H14a that are parallel to the installation surfaces H13 and H14 and are slightly raised.
  • the plane composed of the vertices V13, V14, V18a and V17a of the rising mirror R1 is fixed to the housing H so as to be supported by the projection surface H12a, and the plane (reflection surface) composed of the vertices V12a, V13, V17a and V16 is a projection.
  • the rising mirror R1 is fixed to the housing H so as to be supported by the surfaces H13a and H14a.
  • the installation surface H22 shown in FIG. 7B is formed with a protruding surface H22a which is parallel to the installation surface H22 and slightly raised.
  • the housing H is provided with installation surfaces H23 and H24 for supporting the reflecting surface of the rising mirror R2.
  • On the installation surfaces H23 and H24 there are formed projecting surfaces H23a and H24a that are parallel to the installation surfaces H23 and H24 and are slightly raised.
  • the plane composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is fixed to the housing H so as to be supported by the projection surface H22a, and the plane (reflection surface) composed of the vertices V22, V23a, V27, V26a is a projection.
  • the rising mirror R2 is fixed to the housing H so as to be supported by the surfaces H23a and H24a.
  • a wall surface H4b parallel to a plane formed by the vertices V21, V22, V23a, V24a of the rising mirror R2 is formed on the bottom surface of the recess H4a.
  • the rising mirror R2 is installed in the housing H so that the plane composed of the vertices V21, V22, V23a, and V24a is in contact with the wall surface H4b.
  • the projecting surfaces H12a to H14a and H22a to H24a are formed on the installation surfaces H12 to H14 and H22 to H24, but these projecting surfaces are formed.
  • the raising mirrors R1 and R2 may be fixed to the housing H so that the raising mirrors R1 and R2 are supported on the installation surface.
  • the position of the rising mirror R2 can be positioned further outward (in the direction away from the turntable) by the width ⁇ d than in the first embodiment, the space between the outer wall portion H3 and the rising mirror R1 is increased. It can be further expanded. For this reason, it becomes easier to arrange the raising mirror R2 than in the first embodiment.
  • the outer wall H3 and the apex angles V23a and V24a of the rising mirror R2 can be positioned further outward (in a direction away from the turntable) as compared with the first embodiment, the outer wall H3 and the apex angles V23a and V24a The interval can be increased.
  • the wall thickness of the portion where the concave portion H4a is formed in the inner wall portion H4 is compared with the first embodiment. Become bigger. Thereby, compared with the said Example 1, the intensity
  • the traveling direction of the BD light incident on the rising mirror R1 from the collimator lens 105 side is slightly shifted from the state shown in FIG. 2, and the rising mirror R2 from the half mirror 202 side.
  • the traveling directions of the CD light and the DVD light incident on the light are slightly shifted from the state shown in FIG.
  • the same effects as those of the first and second embodiments can be obtained.
  • the BD objective lens 107 is positioned outward from the CD / DVD objective lens 203.
  • the present invention is not limited to this.
  • the BD objective lens 107 may be positioned inward of the CD / DVD objective lens 203.
  • the optical pickup device becomes larger than the case where it is arranged as shown in FIG.
  • the rising mirror of the optical system for BD and the rising mirror of the optical system for CD / DVD are the same as in the first and second embodiments, and the other rising mirror reflects the laser beam reflected by one of the rising mirrors.
  • BD optical system and CD / DVD optical system can be brought close to each other by forming a parallelogram outline so as not to block, and the BD optical system and CD / DVD optical system are combined.
  • the arrangement space of the entire optical system can be reduced.
  • the arrangement space of the entire optical system including the BD optical system and the CD / DVD optical system can be further reduced by rotating each raising mirror by a predetermined angle. Can do.
  • the recessed part H4a is formed in the inner wall part H4, the optical system can be shifted in a direction approaching the turntable. Therefore, the optical pickup device can be made compact.
  • the rising mirrors R1 and R2 are formed to have a parallelogram outline in plan view.
  • the present invention is not limited to this, and if the vicinity of the vertices V17 and V18 is removed, the rising mirrors R1 and R2
  • the outline of the raising mirror R1 may be another outline, and the raising mirror R2 may have another outline as long as the vicinity of the vertices V23 and V24 is removed.
  • the rising mirror R1 has only a triangular prism portion composed of vertices V15, V18, V18a, V16, V17, and V17a as shown in FIG. 10A from the shape of a rectangular parallelepiped indicated by a dotted line in FIG. The portion that is removed and includes the vertices V11a and V12a may have a remaining shape.
  • the rising mirror R2 has only a triangular prism portion composed of vertices V21, V24, V24a, V22, V23, and V23a as shown in FIG. 10B from the rectangular parallelepiped shape shown in FIG. 4B. May be removed, and the portion including the vertices V25a and V26a may be a remaining contour.
  • the vertices V11, V14, V14a, V12 From the shape of the rectangular parallelepiped indicated by the dotted line in FIG. 4A, the vertices V11, V14, V14a, V12, The shape from which the triangular prism part which consists of V13 and V13a was removed may be sufficient.
  • the vertices V25, V28, V28a, V26 are formed from the rectangular parallelepiped shape shown in FIG. 4 (b) so that the outline of the rising mirror R2 in a plan view becomes a trapezoid. , V27, V27a may be removed.
  • the rising mirror R1 has a triangular prism composed of vertices V18, V18a, V19a, V17, V17a, and V19b removed from the rectangular parallelepiped shape shown in FIG. 4 (a).
  • the shape may be different.
  • the rising mirror R2 removes the triangular prism composed of vertices V23, V23a, V29a, V24, V24a, and V29b from the rectangular parallelepiped shape shown in FIG. 4 (b).
  • the shape may be different.
  • the rising mirror R1 When the rising mirror R1 is configured as shown in FIGS. 10A, 10C, and 10E, the rising mirror R1 is cut out from the original plate as compared with the rising mirror R1 shown in FIG. Although the number of cutting steps increases, the triangular prism portion in the vicinity of the vertices V17 and V18 is removed as in the above-described embodiment, so that this portion is not affected by the CD light and DVD light reflected in the positive Z-axis direction. Further, when the rising mirror R2 is configured as shown in FIGS. 10B, 10D, and 10F, the rising mirror R2 is cut out from the original plate as compared with the rising mirror R2 shown in FIG. However, since the triangular prism portion in the vicinity of the vertices V23 and V24 is removed as in the above-described embodiment, this portion is positioned outside the outer wall portion H3 (inside the housing H). It is done.
  • the opposing side surfaces of the rising mirrors R1 and R2 are parallel to each other.
  • the shape of the rising mirror R1 in a plan view may be a shape that is horizontally reversed from the state shown in FIG. That is, the vertex V11a is at a position approaching the vertex V14 from the vertex V11, the vertex V12a is at a position approaching the vertex V13 from the vertex V12, the vertex V17a is at a position approaching the vertex V16 from the vertex V17, The vertex V18a may be at a position close to the vertex V15 from the vertex V18.
  • the shape of the rising mirror R2 in a plan view may be a shape that is horizontally reversed from the state shown in FIG. That is, the vertex V23a is located at a position approaching the vertex V22 from the vertex V23, the vertex V24a is located at a position approaching the vertex V21 from the vertex V24, the vertex V25a is located at a position approaching the vertex V28 from the vertex V25, The vertex V26a may be at a position close to the vertex V27 from the vertex V26.
  • an optical pickup device that can handle BD, DVD, and CD has been exemplified.
  • the present invention is not limited to this, and there are two objective lenses and two objective lenses corresponding to each objective lens.
  • the present invention can be applied to an optical pickup device having a rising mirror.
  • the present invention can be applied to an optical pickup device that can handle two of BD, DVD, and CD.
  • the optical axis A21 is inclined by approximately 90 in the in-plane direction of the XY plane with respect to the optical axis A11.
  • the inclination angle of the optical axis A21 with respect to the optical axis A11 is not limited to this, and optical Various modifications are possible depending on the layout of the system.
  • the parts constituting each optical system are not limited to the above, and some members may be omitted or some members may be added.
  • Example 1 the inner peripheral side of the rising mirror R1 was cut away from the optical axis A22 as shown in FIG. Further, in the second embodiment, the raising mirror R1 is rotated as shown in FIG.
  • the method of cutting the raising mirror R1 and the method of rotating the raising mirror R1 can be used alone or in combination as a method for separating the raising mirror R1 from the optical axis A22.

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Abstract

In the present invention, a housing that houses an optical system is provided with: a plate-shaped rising mirror (R1) that reflects BD light towards a BD objective lens (107); and a plate-shaped rising mirror (R2) that reflects CD light and DVD light towards a CD/DVD objective lens (203). The optical axes of the laser light reflected by the rising mirrors (R1, R2) and headed for a disc are respectively optical axis (A12) and (A22). At such a time, the edge (in the vicinity of the tip (V17a, V18a)) of rising mirror (R1) adjacent to rising mirror (R2) is formed in a manner so as to separate from optical axis (A22). As a result, it becomes difficult for CD/DVD light reflected by rising mirror (R2) to impinge on the edge of rising mirror (R1), and it is possible to reduce the gap between the rising mirrors (R1, R2).

Description

光ピックアップ装置Optical pickup device
　本発明は、複数の対物レンズを用いた互換型の光ピックアップ装置に関する。 The present invention relates to a compatible optical pickup device using a plurality of objective lenses.
　従来、異なる種類の光ディスクに対応可能な光ピックアップ装置が知られている。たとえば、ＣＤ（Ｃｏｍｐａｃｔ　Ｄｉｓｃ）、ＤＶＤ（Ｄｉｇｉｔａｌ　Ｖｅｒｓａｔｉｌｅ　Ｄｉｓｃ）およびＢＤ（Ｂｌｕ－ｒａｙ　Ｄｉｓｃ）に対応可能な互換型の光ピックアップ装置が開発されている。この種の光ピックアップ装置では、異なる開口数を実現するために、２つの対物レンズが配置され得る。この場合、光ピックアップ装置には、２つの光学系が装備される（たとえば、特許文献１）。２つの光学系は、それぞれ、レーザ光源と、立ち上げミラーと、対物レンズを有する。２つのレーザ光源から出射されたレーザ光は、それぞれ、対応する立ち上げミラーにより、対応する対物レンズへと導かれる。 Conventionally, an optical pickup device that can handle different types of optical disks is known. For example, compatible optical pickup devices that are compatible with CD (Compact Disc), DVD (Digital Versatile Disc), and BD (Blu-ray Disc) have been developed. In this type of optical pickup device, two objective lenses can be arranged in order to realize different numerical apertures. In this case, the optical pickup device is equipped with two optical systems (for example, Patent Document 1). Each of the two optical systems includes a laser light source, a rising mirror, and an objective lens. Laser beams emitted from the two laser light sources are respectively guided to corresponding objective lenses by corresponding rising mirrors.
特開２００８－１２３６０５号公報JP 2008-123605 A
　上記光ピックアップ装置では、２つの光学系をハウジングにコンパクトに収める必要がある。この場合、２つの対物レンズの距離を短縮して、２つの光学系を接近させるのが望ましい。 In the above optical pickup device, it is necessary to store two optical systems in a compact housing. In this case, it is desirable to shorten the distance between the two objective lenses and bring the two optical systems closer.
　本発明は、かかる課題に鑑みてなされたものであり、異なる光学系を適正に収容しながら光ピックアップ装置の小型化を実現することが可能な光ピックアップ装置を提供することを目的とする。 The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical pickup device capable of realizing miniaturization of the optical pickup device while properly accommodating different optical systems.
　本発明の第１の態様は、光ピックアップ装置に関する。この態様に係る光ピックアップ装置は、第１のレーザ光を出射する第１のレーザ光源と、第２のレーザ光を出射する第２のレーザ光源と、前記第１のレーザ光を第１のディスクに収束させる第１の対物レンズと、前記第２のレーザ光を第２のディスクに収束させ、且つ、前記第１の対物レンズよりも前記第２のディスクの内周側に配置された第２の対物レンズと、第１の入射軸に沿って入射した前記第１のレーザ光を第１の出射軸に沿う方向へ反射させて前記第１の対物レンズに入射させる板状の第１の反射部材と、前記第１の出射軸に垂直な平面の面内方向に前記第１の入射軸から傾く第２の入射軸に沿って入射した前記第２のレーザ光を第２の出射軸に沿う方向へ反射させて前記第２の対物レンズに入射させる板状の第２の反射部材と、を備える。ここで、前記第１の反射部材は、前記第２の反射部材に隣接する端縁が前記第２の出射軸から離れる形状を有する。 The first aspect of the present invention relates to an optical pickup device. An optical pickup device according to this aspect includes a first laser light source that emits a first laser light, a second laser light source that emits a second laser light, and the first laser light to a first disk. A first objective lens that converges on the second disk, and a second laser beam that converges the second laser light on the second disk and that is disposed closer to the inner periphery of the second disk than the first objective lens. Objective plate and a plate-like first reflection that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens. The second laser light incident along the second incident axis and along the second incident axis inclined from the first incident axis in an in-plane direction of a plane perpendicular to the member and the first emission axis A plate-like second reflecting member that reflects in the direction and enters the second objective lens; Provided. Here, the first reflecting member has a shape in which an edge adjacent to the second reflecting member is separated from the second emission axis.
　本態様に係る光ピックアップ装置によれば、第２の反射部材に隣接する第１の反射部材の端縁が第２の出射軸から離れるよう第１の反射部材が形成されているため、第２の出射軸に沿って反射された第２のレーザ光が、第１の反射部材によって遮られにくくなる。このため、第１の反射部材を第２の反射部材に接近させることができ、第１および第２の出射軸が互いに近づけられるよう光学系を設置することができる。これにより、光ピックアップ装置の小型化を実現することができる。 In the optical pickup device according to this aspect, since the first reflecting member is formed so that the edge of the first reflecting member adjacent to the second reflecting member is separated from the second emission axis, the second reflecting member is formed. The second laser light reflected along the emission axis is less likely to be blocked by the first reflecting member. For this reason, the 1st reflective member can be made to approach the 2nd reflective member, and an optical system can be installed so that the 1st and 2nd outgoing axis may be brought close to each other. Thereby, size reduction of an optical pick-up apparatus is realizable.
　また、本態様に係る光ピックアップ装置において、前記第１の反射部材は、所定の厚みを有する直方体の前記第２の反射部材に隣接する側面が平面状にカットされた形状を有する構成とされ得る。 In the optical pickup device according to this aspect, the first reflecting member may have a shape in which a side surface adjacent to the second reflecting member of a rectangular parallelepiped having a predetermined thickness is cut into a flat shape. .
　この場合、前記第１の反射部材は、平行四辺形の輪郭を有する構成とされるのが望ましい。こうすると、第１反射部材を、原板から無駄なく簡易に切り出すことにより取得することができ、第１反射部材のコストを抑えることができる。 In this case, it is desirable that the first reflecting member has a parallelogram outline. If it carries out like this, a 1st reflective member can be acquired by cutting out easily from a raw plate without waste, and the cost of a 1st reflective member can be held down.
　また、前記第１の反射部材は、光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁が、前記第２の出射軸から離れるように回転した状態で、前記設置面に設置される構成とされ得る。こうすると、第２の出射軸に沿って反射された第２のレーザ光が、第１の反射部材によって、さらに遮られにくくなる。これにより、第１および第２の出射軸がさらに近づけられるよう光学系を設置することができる。 Further, the first reflecting member is rotated in such a manner that an edge of the first reflecting member placed on the installation surface of the housing accommodating the optical system is separated from the second emission axis. It can be set as the structure installed in the said installation surface. If it carries out like this, the 2nd laser beam reflected along the 2nd output axis will become still more difficult to be interrupted by the 1st reflective member. As a result, the optical system can be installed so that the first and second emission axes can be brought closer to each other.
　また、本態様に係る光ピックアップ装置において、光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁の少なくとも一部が、前記第２の入射軸に沿って進む前記第２のレーザ光の光束部分と前記設置面との間の隙間に入り込むように、前記第１の反射部材が前記設置面に設置される構成とされ得る。こうすると、第２の入射軸に沿って進む第２のレーザ光の光束部分を、第１の反射部材の端縁が遮ることなく、第１および第２の反射部材を設置することができる。これにより、第２のレーザ光が遮られないようにしながら、第１および第２の出射軸が近づけられるように光学系を設置することができる。 In the optical pickup device according to this aspect, at least a part of the edge of the first reflecting member placed on the installation surface of the housing that houses the optical system advances along the second incident axis. The first reflecting member may be installed on the installation surface so as to enter a gap between the light beam portion of the second laser beam and the installation surface. If it carries out like this, the 1st and 2nd reflection member can be installed, without the edge part of a 1st reflection member interrupting | blocking the light beam part of the 2nd laser beam which advances along a 2nd incident axis. Accordingly, the optical system can be installed so that the first and second emission axes can be brought close to each other while the second laser light is not blocked.
　また、本態様に係る光ピックアップ装置において、光学系を収容するハウジングの、前記第１および第２のディスクの内周側の境界を形成する側壁に、当該側壁が肉薄となった凹部が形成され、前記第２の反射部材は、前記凹部に収容されるように前記ハウジングに設置される構成とされ得る。こうすると、第２の反射部材を設置するスペースが限られている場合でも、第２の反射部材を凹部に収容させることにより、第２の反射部材をハウジング内に設置することが可能となる。 Further, in the optical pickup device according to this aspect, a recess having a thin side wall is formed on a side wall that forms a boundary on the inner peripheral side of the first and second disks of the housing that houses the optical system. The second reflecting member may be installed in the housing so as to be accommodated in the recess. Thus, even when the space for installing the second reflecting member is limited, it is possible to install the second reflecting member in the housing by accommodating the second reflecting member in the recess.
　また、本態様に係る光ピックアップ装置において、前記第１のディスクは、ブルーレイディスクであり、前記第２のディスクは、デジタルバータサイルディスクであるよう構成され得る。本態様に係る光ピックアップ装置によれば、上記のように第１反射部材と第２反射部材との間の距離を縮めることができるため、ブルーレイディスクの規格に従った位置に第１の対物レンズを配置しても、第１の対物レンズよりディスク内周側の限られた設置スペースに第２の反射部材を設置することができる。 Also, in the optical pickup device according to this aspect, the first disc may be a Blu-ray disc, and the second disc may be a digital bar sail disc. According to the optical pickup device of this aspect, since the distance between the first reflecting member and the second reflecting member can be reduced as described above, the first objective lens is positioned at a position in accordance with the Blu-ray Disc standard. The second reflecting member can be installed in a limited installation space on the inner circumference side of the disc from the first objective lens.
　本発明の第２の態様は、光ピックアップ装置に関する。この態様に係る光ピックアップ装置は、第１のレーザ光を出射する第１のレーザ光源と、第２のレーザ光を出射する第２のレーザ光源と、前記第１のレーザ光を第１のディスクに収束させる第１の対物レンズと、前記第２のレーザ光を第２のディスクに収束させ、且つ、前記第１の対物レンズよりも前記第２のディスクの内周側に配置された第２の対物レンズと、第１の入射軸に沿って入射した前記第１のレーザ光を第１の出射軸に沿う方向へ反射させて前記第１の対物レンズに入射させる板状の第１の反射部材と、前記第１の出射軸に垂直な平面の面内方向に前記第１の入射軸から傾く第２の入射軸に沿って入射した前記第２のレーザ光を第２の出射軸に沿う方向へ反射させて前記第２の対物レンズに入射させる板状の第２の反射部材と、を備える。ここで、前記第１の反射部材は、光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁が、前記第２の出射軸から離れるように回転した状態で、前記設置面に設置される。 The second aspect of the present invention relates to an optical pickup device. An optical pickup device according to this aspect includes a first laser light source that emits a first laser light, a second laser light source that emits a second laser light, and the first laser light to a first disk. A first objective lens that converges on the second disk, and a second laser beam that converges the second laser light on the second disk and that is disposed closer to the inner periphery of the second disk than the first objective lens. Objective plate and a plate-like first reflection that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens. The second laser light incident along the second incident axis and along the second incident axis inclined from the first incident axis in an in-plane direction of a plane perpendicular to the member and the first emission axis A plate-like second reflecting member that reflects in the direction and enters the second objective lens; Provided. Here, the first reflecting member is rotated in such a manner that an edge of the first reflecting member placed on the installation surface of the housing that houses the optical system is separated from the second emission axis. , Installed on the installation surface.
　本態様に係る光ピックアップ装置によれば、第２の出射軸に沿って反射された第２のレーザ光が、第１の反射部材によって遮られにくくなる。このため、第１の反射部材を第２の反射部材に接近させることができ、第１および第２の出射軸が互いに近づけられるよう光学系を設置することができる。これにより、光ピックアップ装置の小型化を実現することができる。 According to the optical pickup device according to this aspect, the second laser light reflected along the second emission axis is less likely to be blocked by the first reflecting member. For this reason, the 1st reflective member can be made to approach the 2nd reflective member, and an optical system can be installed so that the 1st and 2nd outgoing axis may be brought close to each other. Thereby, size reduction of an optical pick-up apparatus is realizable.
　以上のとおり、本発明によれば、異なる光学系を適正に収容しながら光ピックアップ装置の小型化を実現することが可能な光ピックアップ装置を提供することができる。 As described above, according to the present invention, it is possible to provide an optical pickup device capable of realizing downsizing of the optical pickup device while appropriately accommodating different optical systems.
　本発明の特徴は、以下に示す実施の形態により更に明らかとなろう。ただし、以下の実施の形態は、あくまでも本発明の一つの実施形態であって、本発明ないし各構成要件の用語の意義は、以下の実施の形態により何ら制限されるものではない。 The characteristics of the present invention will be further clarified by the following embodiments. However, the following embodiment is merely one embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited at all by the following embodiment.
実施の形態に係るターンテーブルの中心、ＢＤ用対物レンズおよびＣＤ／ＤＶＤ用対物レンズの位置関係について説明する図である。It is a figure explaining the positional relationship of the center of the turntable which concerns on embodiment, the objective lens for BD, and the objective lens for CD / DVD. 実施例１に係る光ピックアップ装置を模式的に示す図である。1 is a diagram schematically illustrating an optical pickup device according to a first embodiment. 実施例１に係る光ピックアップ装置を模式的に示す図および立ち上げミラーの近傍を示す図である。1 is a diagram schematically illustrating an optical pickup device according to a first embodiment and a diagram illustrating the vicinity of a rising mirror. 実施例１に係る立ち上げミラーの形状を説明する図およびハウジング内に設置された立ち上げミラーの側面図である。It is a figure explaining the shape of the raising mirror which concerns on Example 1, and a side view of the raising mirror installed in the housing. 比較例に係る立ち上げミラーが用いられた場合の、立ち上げミラーと光束との位置関係を示す図および立ち上げミラーとハウジングとの位置関係を示す図である。It is a figure which shows the positional relationship of a raising mirror and a light beam when a raising mirror which concerns on a comparative example is used, and a figure which shows the positional relationship of a raising mirror and a housing. 実施例２に係る立ち上げミラーの回転状態を示す図および立ち上げミラーの近傍を示す図である。FIG. 10 is a diagram illustrating a rotation state of a rising mirror according to a second embodiment and a diagram illustrating the vicinity of the rising mirror. 実施例２に係るハウジング内に設置された立ち上げミラーの側面図である。It is a side view of the raising mirror installed in the housing which concerns on Example 2. FIG. 実施例２に係る光ピックアップ装置の具体的構成例を示す図である。FIG. 6 is a diagram illustrating a specific configuration example of an optical pickup device according to a second embodiment. 実施例２に係る立ち上げミラーが設置されるハウジングの部分を拡大した図である。It is the figure which expanded the part of the housing in which the raising mirror which concerns on Example 2 is installed. 変更例に係る立ち上げミラーの形状を示す図である。It is a figure which shows the shape of the raising mirror which concerns on the example of a change.
　本実施の形態は、ＣＤ（Ｃｏｍｐａｃｔ　Ｄｉｓｃ）、ＤＶＤ（Ｄｉｇｉｔａｌ　Ｖｅｒｓａｔｉｌｅ　Ｄｉｓｃ）およびＢＤ（Ｂｌｕ－ｒａｙ　Ｄｉｓｃ）にレーザ光を照射する光ピックアップ装置に本発明を適用したものである。 In the present embodiment, the present invention is applied to an optical pickup device that irradiates a CD (Compact Disc), a DVD (Digital Versatile Disc), and a BD (Blu-ray Disc) with laser light.
　まず、図１（ａ）、（ｂ）を参照して、光ピックアップ装置における、ターンテーブルの中心と、ＢＤ用対物レンズと、ＣＤ／ＤＶＤ用対物レンズの位置関係について説明する。 First, the positional relationship among the center of the turntable, the BD objective lens, and the CD / DVD objective lens in the optical pickup device will be described with reference to FIGS.
　なお、ＢＤ用対物レンズとは、ＢＤに対応するＢＤ用光学系から導かれる波長４００ｎｍ程度のレーザ光（以下、「ＢＤ光」という）を、ＢＤの記録層に適正に収束させる対物レンズのことである。また、ＣＤ／ＤＶＤ用対物レンズとは、ＣＤとＤＶＤの両方に対応するＣＤ／ＤＶＤ用光学系から導かれる波長７８０ｎｍ程度のレーザ光（以下、「ＣＤ光」という）と、波長６５０ｎｍ程度のレーザ光（以下、「ＤＶＤ光」という）を、それぞれ、ＣＤとＤＶＤの記録層に適正に収束させる対物レンズのことである。 The BD objective lens is an objective lens that appropriately converges a laser beam having a wavelength of about 400 nm (hereinafter referred to as “BD light”) guided from a BD optical system corresponding to the BD onto a BD recording layer. It is. The CD / DVD objective lens is a laser beam having a wavelength of about 780 nm (hereinafter referred to as “CD light”) derived from a CD / DVD optical system compatible with both CD and DVD, and a laser having a wavelength of about 650 nm. It is an objective lens that properly converges light (hereinafter referred to as “DVD light”) onto the recording layers of CD and DVD, respectively.
　図１（ａ）の構成では、ターンテーブルの中心から外側方向に向かって、順に、ＢＤ用対物レンズとＣＤ／ＤＶＤ用対物レンズが配置されている。ターンテーブルの中心と、ＢＤ用対物レンズと、ＣＤ／ＤＶＤ用対物レンズは、ディスクに垂直な方向から見た場合に同一直線上に並んでいる。 In the configuration of FIG. 1A, a BD objective lens and a CD / DVD objective lens are arranged in order from the center of the turntable toward the outside. The center of the turntable, the BD objective lens, and the CD / DVD objective lens are aligned on the same straight line when viewed from a direction perpendicular to the disc.
　ここで、ＢＤ、ＤＶＤおよびＣＤは、トラックの最内周位置が規格によって定められている。このため、光ピックアップ装置が最もターンテーブルに近づく位置に位置付けられたときに、それぞれの対物レンズが、対応するディスクのトラック最内周位置またはそれよりも内側に位置付けられる必要がある。トラック最内周位置は、ＢＤ、ＤＶＤおよびＣＤのうち、ＢＤが最も内側である。したがって、光ピックアップ装置が最も内側方向に位置付けられた場合の、ターンテーブルの中心からＢＤ用対物レンズまでの距離は、ＢＤの中心からＢＤのトラック最内周位置までの距離（“所定値ｒ”）以下とする必要がある。 Here, for BD, DVD, and CD, the innermost circumferential position of the track is determined by the standard. For this reason, when the optical pickup device is positioned at the position closest to the turntable, each objective lens needs to be positioned at the innermost track position of the corresponding disk or at the inner side thereof. The innermost track position of the track is the innermost side of BD among BD, DVD and CD. Therefore, the distance from the center of the turntable to the BD objective lens when the optical pickup device is positioned in the innermost direction is the distance from the center of the BD to the innermost track position of the BD (“predetermined value r”). ) It is necessary to do the following.
　図１（ａ）では、ターンテーブルの中心からＢＤ用対物レンズまでの距離が所定値ｒよりも小さくなるようＢＤ用対物レンズが配置され、ＢＤ用対物レンズの位置に合わせてＢＤ用光学系が配置されている。そして、ＢＤ用対物レンズとＢＤ用光学系が占有するスペースの外側に、ＣＤ／ＤＶＤ用対物レンズおよびＣＤ／ＤＶＤ用光学系が配される。しかしながら、ＢＤ用光学系は、収差補正のための機構が必要となるため、占有スペースが大きくなり易い。このため、ＣＤ／ＤＶＤ用光学系よりも内側にＢＤ用光学系の配置スペースを確保することが難しく、ＣＤ／ＤＶＤ用光学系よりも内側にＢＤ用光学系の配置スペースを確保すると、図１（ａ）に示すように、ターンテーブルの中心からＣＤ／ＤＶＤ用対物レンズまでの距離が大きくなり、結果、光ピックアップ装置が大型になってしまう。 In FIG. 1A, the BD objective lens is arranged so that the distance from the center of the turntable to the BD objective lens is smaller than a predetermined value r, and the BD optical system is adapted to the position of the BD objective lens. Has been placed. The CD / DVD objective lens and the CD / DVD optical system are arranged outside the space occupied by the BD objective lens and the BD optical system. However, since the BD optical system requires a mechanism for correcting aberrations, the occupied space tends to be large. For this reason, it is difficult to secure an arrangement space for the BD optical system on the inner side than the CD / DVD optical system. If the arrangement space for the BD optical system is secured on the inner side than the CD / DVD optical system, FIG. As shown to (a), the distance from the center of a turntable to the objective lens for CD / DVD becomes large, and an optical pick-up apparatus will become large sized as a result.
　そこで、図１（ｂ）に示すように、ＢＤ用対物レンズをＣＤ／ＤＶＤ用対物レンズよりも外側に配するレイアウトが考えられる。こうすると、ターンテーブルの中心からＢＤ用対物レンズまでの距離を所定値ｒとしながら、占有するスペースが大きいＢＤ用光学系を、外側方向に配することができるため、光ピックアップ装置の小型化が可能となる。しかしながら、この場合には、ＢＤ用対物レンズの内側の限られたスペースに、ＣＤ／ＤＶＤ用光学系の配置スペースを確保する必要がある。 Therefore, as shown in FIG. 1B, a layout in which the BD objective lens is arranged outside the CD / DVD objective lens is conceivable. In this way, the BD optical system that occupies a large space can be arranged outward while the distance from the center of the turntable to the BD objective lens is set to the predetermined value r, so that the optical pickup device can be downsized. It becomes possible. However, in this case, it is necessary to secure an arrangement space for the optical system for CD / DVD in a limited space inside the objective lens for BD.
　以下の実施例１、２では、ＢＤ用対物レンズがＣＤ／ＤＶＤ用対物レンズよりも外側に配された場合に、ＢＤ対物レンズをターンテーブルの中心から所定値ｒの距離内に配置すると共に、ＣＤ／ＤＶＤ用対物レンズをターンテーブルの中心とＢＤ用対物レンズとの間に配置することが可能な光ピックアップ装置が示されている。 In Examples 1 and 2 below, when the BD objective lens is disposed outside the CD / DVD objective lens, the BD objective lens is disposed within a distance of a predetermined value r from the center of the turntable, An optical pickup device is shown in which a CD / DVD objective lens can be arranged between the center of a turntable and a BD objective lens.
　＜実施例１＞
　図２と図３（ａ）は、実施の形態に係る光ピックアップ装置を模式的に示す図である。図２は、光学系を裏側から見た場合の平面図であり、図３（ａ）は、対物レンズアクチュエータ３０２の周辺部分を側面側から見た場合の一部透視図である。光ピックアップ装置の光学系は、ＢＤ用の光学系とＣＤ／ＤＶＤ用の光学系に区分される。また、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系は、ハウジングＨに収容されている。 <Example 1>
2 and 3 (a) are diagrams schematically showing an optical pickup device according to the embodiment. FIG. 2 is a plan view when the optical system is viewed from the back side, and FIG. 3A is a partial perspective view when the peripheral portion of the objective lens actuator 302 is viewed from the side surface side. The optical system of the optical pickup device is divided into an optical system for BD and an optical system for CD / DVD. The BD optical system and the CD / DVD optical system are housed in a housing H.
　ＢＤ用光学系は、半導体レーザ１０１と、回折格子１０２と、偏光ビームスプリッタ１０３と、１／４波長板１０４と、コリメータレンズ１０５と、レンズアクチュエータ１０６と、立ち上げミラーＲ１と、ＢＤ用対物レンズ１０７と、光検出器１０８から構成されている。 The optical system for BD includes a semiconductor laser 101, a diffraction grating 102, a polarizing beam splitter 103, a quarter wavelength plate 104, a collimator lens 105, a lens actuator 106, a rising mirror R1, and an objective lens for BD. 107 and a photodetector 108.
　半導体レーザ１０１は、ＢＤ光をＹ軸正方向に出射する。回折格子１０２は、半導体レーザ１０１から出射されたＢＤ光をメインビームと２つのサブビームに分割する。偏光ビームスプリッタ１０３は、回折格子１０２側から入射されたレーザ光を反射する。偏光ビームスプリッタ１０３は、薄板状の平行平板となっており、その入射面に、偏光膜が形成されている。半導体レーザ１０１は、ＢＤ光の偏光方向が偏光ビームスプリッタ１０３に対してＳ偏光となるように配置されている。 The semiconductor laser 101 emits BD light in the positive Y-axis direction. The diffraction grating 102 splits the BD light emitted from the semiconductor laser 101 into a main beam and two sub beams. The polarization beam splitter 103 reflects the laser light incident from the diffraction grating 102 side. The polarizing beam splitter 103 is a thin parallel plate, and a polarizing film is formed on the incident surface thereof. The semiconductor laser 101 is arranged so that the polarization direction of the BD light is S-polarized with respect to the polarization beam splitter 103.
　１／４波長板１０４は、偏光ビームスプリッタ１０３によって反射されたＢＤ光を円偏光に変換するとともに、ＢＤからの反射光を、ＢＤへ向かうときの偏光方向に直交する直線偏光に変換する。これにより、ＢＤによって反射されたＢＤ光は、偏光ビームスプリッタ１０３を透過して光検出器１０８へと導かれる。 The quarter wavelength plate 104 converts the BD light reflected by the polarization beam splitter 103 into circularly polarized light, and converts the reflected light from the BD into linearly polarized light that is orthogonal to the polarization direction when traveling toward the BD. As a result, the BD light reflected by the BD passes through the polarization beam splitter 103 and is guided to the photodetector 108.
　コリメータレンズ１０５は、偏光ビームスプリッタ１０３によって反射されたレーザ光を平行光に変換する。レンズアクチュエータ１０６は、コリメータレンズ１０５を、コリメータレンズ１０５の光軸方向に駆動する。 The collimator lens 105 converts the laser light reflected by the polarization beam splitter 103 into parallel light. The lens actuator 106 drives the collimator lens 105 in the optical axis direction of the collimator lens 105.
　レンズアクチュエータ１０６は、移動部材１０６ａと、シャフト１０６ｂと、ギア１０６ｃと、モータ１０６ｄを備える。移動部材１０６ａは、コリメータレンズ１０５を保持している。移動部材１０６ａは、コリメータレンズ１０５の光軸方向に移動可能にシャフト１０６ｂに支持されている。ギア１０６ｃは、モータ１０６ｄの駆動軸に連結され、移動部材１０６ａに形成されたギア（図示せず）と噛み合っている。モータ１０６ｄが駆動されることにより、移動部材１０６ａに保持されたコリメータレンズ１０５が光軸方向に移動する。こうして、コリメータレンズ１０５が制御信号に応じて移動されることにより、ＢＤ光に生じる収差が補正される。 The lens actuator 106 includes a moving member 106a, a shaft 106b, a gear 106c, and a motor 106d. The moving member 106 a holds the collimator lens 105. The moving member 106 a is supported by the shaft 106 b so as to be movable in the optical axis direction of the collimator lens 105. The gear 106c is connected to the drive shaft of the motor 106d and meshes with a gear (not shown) formed on the moving member 106a. By driving the motor 106d, the collimator lens 105 held by the moving member 106a moves in the optical axis direction. Thus, the aberration generated in the BD light is corrected by moving the collimator lens 105 according to the control signal.
　立ち上げミラーＲ１は、コリメータレンズ１０５側から入射されたＢＤ光を、ＢＤ用対物レンズ１０７に向かう方向に反射する。なお、図２と図３（ａ）に示すように、立ち上げミラーＲ１には、ＢＤ光の反射領域が破線で示されており、反射領域の中心が黒丸で示されている。また、コリメータレンズ１０５側から立ち上げミラーＲ１に入射するＢＤ光の光軸Ａ１１は、Ｘ軸方向であり、一点鎖線で示されている。また、立ち上げミラーＲ１により反射されＢＤ用対物レンズ１０７に向かうＢＤ光の光軸Ａ１２は、Ｚ軸方向であり、一点鎖線で示されている。 The rising mirror R1 reflects the BD light incident from the collimator lens 105 side in a direction toward the BD objective lens 107. As shown in FIGS. 2 and 3A, in the rising mirror R1, the reflection region of the BD light is indicated by a broken line, and the center of the reflection region is indicated by a black circle. Further, the optical axis A11 of the BD light incident on the rising mirror R1 from the collimator lens 105 side is the X-axis direction and is indicated by a one-dot chain line. Further, the optical axis A12 of the BD light reflected by the rising mirror R1 and directed to the BD objective lens 107 is the Z-axis direction and is indicated by a one-dot chain line.
　ＢＤ用対物レンズ１０７は、ＢＤ光をＢＤの記録層上に適正に収束できるように設計されている。ＢＤ用対物レンズ１０７は、ＢＤ用対物レンズ１０７の光軸が、立ち上げミラーＲ１の反射領域の中心からＺ軸正方向に延びる直線上に位置付けられるよう設置される。また、ＢＤ用対物レンズ１０７は、ホルダ３０１に保持され、ホルダ３０１は、対物レンズアクチュエータ３０２によって、フォーカス方向およびトラッキング方向に駆動される。このようにホルダ３０１が駆動されることにより、ＢＤ用対物レンズ１０７が、フォーカス方向およびトラッキング方向に駆動される。 The BD objective lens 107 is designed so that the BD light can be properly converged on the recording layer of the BD. The BD objective lens 107 is installed so that the optical axis of the BD objective lens 107 is positioned on a straight line extending in the positive direction of the Z axis from the center of the reflection region of the rising mirror R1. The BD objective lens 107 is held by a holder 301, and the holder 301 is driven in a focus direction and a tracking direction by an objective lens actuator 302. By driving the holder 301 in this way, the BD objective lens 107 is driven in the focus direction and the tracking direction.
　ＢＤからの反射光は、１／４波長板１０４により偏光ビームスプリッタ１０３に対してＰ偏光となる直線偏光に変換される。これにより、ＢＤからの反射光は、偏光ビームスプリッタ１０３を透過する。偏光ビームスプリッタ１０３は、ＢＤ光の光軸に対して４５度傾くように配置されている。このため、収束状態で偏光ビームスプリッタ１０３を透過するＢＤ光に、非点収差が導入される。 The reflected light from the BD is converted by the quarter wavelength plate 104 into linearly polarized light that becomes P-polarized light with respect to the polarizing beam splitter 103. Thereby, the reflected light from the BD passes through the polarization beam splitter 103. The polarization beam splitter 103 is disposed so as to be inclined by 45 degrees with respect to the optical axis of the BD light. For this reason, astigmatism is introduced into the BD light transmitted through the polarization beam splitter 103 in a converged state.
　光検出器１０８には、ＢＤ光のメインビームと２つのサブビームが照射される位置に４分割センサが配置されている。光検出器１０８のセンサレイアウトは、各センサからの出力により、再生ＲＦ信号、フォーカスエラー信号、トラッキングエラー信号が生成されるよう設定されている。 The photodetector 108 is provided with a four-divided sensor at a position where the main beam of BD light and two sub beams are irradiated. The sensor layout of the photodetector 108 is set so that a reproduction RF signal, a focus error signal, and a tracking error signal are generated by the output from each sensor.
　ＣＤ／ＤＶＤ用光学系は、半導体レーザ２０１と、ハーフミラー２０２と、立ち上げミラーＲ２と、ＣＤ／ＤＶＤ用対物レンズ２０３と、光検出器２０４から構成されている。 The CD / DVD optical system includes a semiconductor laser 201, a half mirror 202, a rising mirror R2, a CD / DVD objective lens 203, and a photodetector 204.
　半導体レーザ２０１は、１つのＣＡＮ内にＣＤ光とＤＶＤ光を出力するレーザ素子を備え、ＣＤ光とＤＶＤ光をＸ軸負方向に出射する。ＣＤ光とＤＶＤ光の光束は、一点鎖線で表示されている。ハーフミラー２０２は、半導体レーザ２０１側から入射されたレーザ光のうち半分を反射して、立ち上げミラーＲ２へと導くと共に、立ち上げミラーＲ２側から入射されたレーザ光のうち半分を透過して、光検出器２０４へと導く。 The semiconductor laser 201 includes a laser element that outputs CD light and DVD light in one CAN, and emits CD light and DVD light in the negative X-axis direction. The luminous fluxes of the CD light and the DVD light are indicated by a one-dot chain line. The half mirror 202 reflects half of the laser light incident from the semiconductor laser 201 side, guides it to the rising mirror R2, and transmits half of the laser light incident from the rising mirror R2 side. To the photodetector 204.
　立ち上げミラーＲ２は、ハーフミラー２０２側から入射されたＣＤ光とＤＶＤ光を、ＣＤ／ＤＶＤ用対物レンズ２０３に向かう方向に反射する。なお、図２と図３（ａ）に示すように、立ち上げミラーＲ２には、ＣＤ光とＤＶＤ光の反射領域が破線で示されており、反射領域の中心が黒丸で示されている。また、ハーフミラー２０２側から立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の光軸Ａ２１は、Ｙ軸方向であり、一点鎖線で示されている。また、立ち上げミラーＲ２により反射されＣＤ／ＤＶＤ用対物レンズ２０３に向か示されている。 The rising mirror R2 reflects the CD light and DVD light incident from the half mirror 202 side in a direction toward the CD / DVD objective lens 203. As shown in FIGS. 2 and 3A, in the rising mirror R2, the reflection area of the CD light and the DVD light is indicated by a broken line, and the center of the reflection area is indicated by a black circle. Further, the optical axis A21 of the CD light and DVD light incident on the rising mirror R2 from the half mirror 202 side is the Y-axis direction and is indicated by a one-dot chain line. Further, it is reflected by the rising mirror R2 and shown toward the CD / DVD objective lens 203.
　ＣＤ／ＤＶＤ用対物レンズ２０３は、ＣＤ光とＤＶＤ光をそれぞれ、ＣＤとＤＶＤの記録層上に適正に収束できるように設計されている。ＣＤ／ＤＶＤ用対物レンズ２０３は、ＣＤ／ＤＶＤ用対物レンズ２０３の光軸が、立ち上げミラーＲ２の反射領域の中心からＺ軸正方向に延びる直線上に位置付けられるよう設置される。また、ＣＤ／ＤＶＤ用対物レンズ２０３は、ＢＤ用対物レンズ１０７と同様、ホルダ３０１に保持され、ホルダ３０１が駆動されることにより、ＣＤ／ＤＶＤ用対物レンズ２０３が、フォーカス方向およびトラッキング方向に駆動される。 The CD / DVD objective lens 203 is designed so that the CD light and the DVD light can be properly converged on the recording layers of the CD and the DVD, respectively. The CD / DVD objective lens 203 is installed so that the optical axis of the CD / DVD objective lens 203 is positioned on a straight line extending in the positive direction of the Z axis from the center of the reflection region of the rising mirror R2. Similarly to the BD objective lens 107, the CD / DVD objective lens 203 is held by the holder 301. When the holder 301 is driven, the CD / DVD objective lens 203 is driven in the focus direction and the tracking direction. Is done.
　ＣＤ／ＤＶＤによって反射されたＣＤ光とＤＶＤ光は、立ち上げミラーＲ２により反射され、収束状態でハーフミラー２０２に入射する。ハーフミラー２０２は、ＣＤ光とＤＶＤ光の光軸に対して４５度傾くように配置されている。このため、収束状態でハーフミラー２０２を透過するＣＤ光とＤＶＤ光に、非点収差が導入される。光検出器２０４には、ＣＤ光とＤＶＤ光が照射される位置に４分割センサが配置されている。光検出器２０４のセンサレイアウトは、各センサからの出力により、再生ＲＦ信号、フォーカスエラー信号、トラッキングエラー信号が生成されるよう設定されている。 CD light and DVD light reflected by the CD / DVD are reflected by the rising mirror R2 and enter the half mirror 202 in a converged state. The half mirror 202 is disposed so as to be inclined by 45 degrees with respect to the optical axes of the CD light and the DVD light. For this reason, astigmatism is introduced into the CD light and the DVD light transmitted through the half mirror 202 in a converged state. The photodetector 204 is provided with a four-divided sensor at a position where CD light and DVD light are irradiated. The sensor layout of the photodetector 204 is set so that a reproduction RF signal, a focus error signal, and a tracking error signal are generated by the output from each sensor.
　ハウジングＨの周辺部（斜線で示す部分）は、ハウジングＨの中央部よりも一段高く（Ｚ軸負方向側に高く）なっている。すなわち、ハウジングＨは、Ｚ軸負方向が開放され、周囲に壁を有する、いわゆる箱形状となっている。また、ハウジングＨの内部には、ハウジングＨの底面または側壁から延びた区画壁も含めて、光学系を構成する各部材の実装領域が形成される。ＢＤ用光学系とＣＤ／ＤＶＤ用光学系は、ハウジングＨの壁で囲まれた領域内に収容されている。ＢＤ用光学系とＣＤ／ＤＶＤ用光学系を構成する各部材は、ハウジングＨの壁で囲まれた領域内に設けられたそれぞれの設置領域に、底部が設置面に載せられるようにして、設置される。こうしてＢＤ用光学系とＣＤ／ＤＶＤ用光学系が設置されると、ターンテーブルの中心と、立ち上げミラーＲ１のＢＤ光の反射領域の中心（ＢＤ用対物レンズ１０７の光軸）と、立ち上げミラーＲ２のＣＤ光とＤＶＤ光の反射領域の中心（ＣＤ／ＤＶＤ用対物レンズ２０３の光軸の中心）が、Ｚ軸方向に見て同一直線上に位置付けられる。 The peripheral portion of the housing H (the portion indicated by hatching) is one step higher than the central portion of the housing H (higher in the Z-axis negative direction side). That is, the housing H has a so-called box shape in which the negative Z-axis direction is opened and a wall is provided around the housing H. In addition, a mounting area for each member constituting the optical system is formed inside the housing H, including a partition wall extending from the bottom surface or the side wall of the housing H. The BD optical system and the CD / DVD optical system are accommodated in a region surrounded by the wall of the housing H. Each member constituting the optical system for BD and the optical system for CD / DVD is installed so that the bottom part is placed on the installation surface in each installation area provided in the area surrounded by the wall of the housing H. Is done. When the BD optical system and the CD / DVD optical system are thus installed, the center of the turntable, the center of the reflection area of the BD light of the rising mirror R1 (the optical axis of the BD objective lens 107), and the startup The center of the reflection area of the CD light and the DVD light of the mirror R2 (the center of the optical axis of the CD / DVD objective lens 203) is positioned on the same straight line when viewed in the Z-axis direction.
　ハウジングＨには、軸受けＨ１、Ｈ２が形成されている。軸受けＨ１、Ｈ２がシャフト（図示せず）に支持された状態で、ハウジングＨが内側方向と外側方向に移動される。これにより、ＢＤ用対物レンズ１０７と、ＣＤ／ＤＶＤ用対物レンズ２０３が、ディスクの径方向に移動される。 The housing H has bearings H1 and H2. With the bearings H1 and H2 supported by a shaft (not shown), the housing H is moved inward and outward. As a result, the BD objective lens 107 and the CD / DVD objective lens 203 are moved in the radial direction of the disc.
　また、ハウジングＨは、ターンテーブル中心側の壁が円弧状に湾曲しており、この湾曲部に外壁部Ｈ３と内壁部Ｈ４が形成されている。ここで、外壁部Ｈ３は、ターンテーブルの外周形状に合わせて形成される。すなわち、光ピックアップ装置がターンテーブルに最も接近した位置（最も内側方向の位置）に位置付けられると、外壁部Ｈ３が、所定の隙間をおいて、ターンテーブルの外周に対向する。また、立ち上げミラーＲ１とＢＤ用対物レンズ１０７は、光ピックアップ装置が最も内側方向に位置付けられた場合に、ＸＹ平面上におけるターンテーブルの中心からＢＤ用対物レンズ１０７までの距離が、図１（ｂ）と同様、所定値ｒとなるようハウジングＨに配置されている。このため、立ち上げミラーＲ２は、外壁部Ｈ３と立ち上げミラーＲ１との間の僅かな隙間に配置される必要がある。 Further, the housing H has a wall on the center side of the turntable that is curved in an arc shape, and an outer wall portion H3 and an inner wall portion H4 are formed in the curved portion. Here, the outer wall portion H3 is formed in accordance with the outer peripheral shape of the turntable. That is, when the optical pickup device is positioned at the position closest to the turntable (the position in the innermost direction), the outer wall portion H3 faces the outer periphery of the turntable with a predetermined gap. In addition, when the optical pickup device is positioned in the innermost direction, the rising mirror R1 and the BD objective lens 107 have a distance from the center of the turntable on the XY plane to the BD objective lens 107 in FIG. As in b), the housing H is arranged so as to have a predetermined value r. For this reason, the raising mirror R2 needs to be disposed in a slight gap between the outer wall portion H3 and the raising mirror R1.
　そこで、本実施例では、立ち上げミラーＲ２を配置するために、内壁部Ｈ４に凹部Ｈ４ａが形成される。すなわち、円弧状に形成された壁の厚みが、立ち上げミラーＲ２の内側方向の端部の形状に合わせて薄くされ、これにより、内壁部Ｈ４に、内側方向に窪んだ凹部Ｈ４ａが形成される。この凹部Ｈ４ａの部分に、立ち上げミラーＲ２の内側方向の端部が位置付けられる。 Therefore, in this embodiment, a concave portion H4a is formed in the inner wall portion H4 in order to arrange the rising mirror R2. That is, the thickness of the wall formed in the arc shape is reduced in accordance with the shape of the end portion in the inner direction of the rising mirror R2, thereby forming the concave portion H4a recessed in the inner direction in the inner wall portion H4. . The end of the rising mirror R2 in the inner direction is positioned at the concave portion H4a.
　さらに、本実施例では、立ち上げミラーＲ２を配置するために、立ち上げミラーＲ２の内側方向の端部が、以下に示すような形状とされる。 Furthermore, in this embodiment, in order to arrange the rising mirror R2, the inner end of the rising mirror R2 has a shape as shown below.
　図４（ａ）、（ｂ）は、立ち上げミラーＲ１、Ｒ２の形状を説明する図である。 4 (a) and 4 (b) are diagrams for explaining the shapes of the rising mirrors R1 and R2.
　図４（ａ）を参照して、立ち上げミラーＲ１は、８つの頂点Ｖ１１～Ｖ１８を有する板状の部材からなっている。平面視において、立ち上げミラーＲ１の輪郭は、平行四辺形である。すなわち、立ち上げミラーＲ１は、点線で示す直方体形状から、頂点Ｖ１３、Ｖ１４を通る平面によって頂点Ｖ１１、Ｖ１２を切り落とし、さらに、頂点Ｖ１５、Ｖ１６を通る平面によって頂点Ｖ１７、Ｖ１８を切り落とした形状を有する。 Referring to FIG. 4A, the rising mirror R1 is made of a plate-like member having eight vertices V11 to V18. In plan view, the contour of the rising mirror R1 is a parallelogram. That is, the rising mirror R1 has a shape in which the vertices V11 and V12 are cut off from the rectangular parallelepiped shape indicated by the dotted line by a plane passing through the vertices V13 and V14, and further the vertices V17 and V18 are cut off by a plane passing through the vertices V15 and V16. .
　頂点Ｖ１１ａ、Ｖ１２ａ、Ｖ１３、Ｖ１４からなる平面と、頂点Ｖ１５、Ｖ１６、Ｖ１７ａ、Ｖ１８ａからなる平面は平行である。また、頂点Ｖ１１ａは、頂点Ｖ１１から頂点Ｖ１５に接近した位置にあり、頂点Ｖ１２ａは、頂点Ｖ１２から頂点Ｖ１６に接近した位置にあり、頂点Ｖ１７ａは、頂点Ｖ１７から頂点Ｖ１３に接近した位置にあり、頂点Ｖ１８ａは、頂点Ｖ１８から頂点Ｖ１４に接近した位置にある。 The plane consisting of the vertices V11a, V12a, V13 and V14 and the plane consisting of the vertices V15, V16, V17a and V18a are parallel. The vertex V11a is located at a position approaching the vertex V15 from the vertex V11, the vertex V12a is located at a position approaching the vertex V16 from the vertex V12, and the vertex V17a is located at a position approaching the vertex V13 from the vertex V17. The vertex V18a is located close to the vertex V14 from the vertex V18.
　こうして、立ち上げミラーＲ１は、反射面（頂点Ｖ１２ａ、Ｖ１３、Ｖ１７ａ、Ｖ１６からなる面）とその反対側の面が平行四辺形となっている。平面視において、反射面の輪郭とその反対側の面の輪郭は、完全に一致する。また、反射面とその反対側の面は互いに平行である。立ち上げミラーＲ１は、反射面がＢＤ光の光束を十分受光できるよう、Ｙ軸を回転軸として、反射面がＺ軸正方向を向くように４５度傾けられ状態で、ハウジングＨ内に配置される。 Thus, in the rising mirror R1, the reflecting surface (the surface formed by the vertices V12a, V13, V17a, and V16) and the opposite surface are parallelograms. In plan view, the contour of the reflecting surface and the contour of the opposite surface completely coincide. The reflective surface and the opposite surface are parallel to each other. The rising mirror R1 is disposed in the housing H in a state where the reflecting surface is tilted 45 degrees so that the reflecting surface faces the positive direction of the Z axis with the Y axis as the rotation axis so that the reflecting surface can sufficiently receive the light beam of BD light. The
　図４（ｂ）を参照して、立ち上げミラーＲ２は、８つの頂点Ｖ２１～Ｖ２８を有する板状の部材からなっている。平面視において、立ち上げミラーＲ２の輪郭は、平行四辺形である。すなわち、立ち上げミラーＲ２は、点線で示す直方体形状から、頂点Ｖ２１、Ｖ２２を通る平面によって頂点Ｖ２３、Ｖ２４を切り落とし、さらに、頂点Ｖ２７、Ｖ２８を通る平面によって頂点Ｖ２５、Ｖ２６が切り落とした形状を有する。 Referring to FIG. 4B, the rising mirror R2 is made of a plate-like member having eight vertices V21 to V28. In plan view, the contour of the rising mirror R2 is a parallelogram. That is, the rising mirror R2 has a shape in which the vertices V23 and V24 are cut off from a rectangular parallelepiped shape indicated by a dotted line by a plane passing through the vertices V21 and V22, and further, the vertices V25 and V26 are cut off by a plane passing through the vertices V27 and V28. .
　頂点Ｖ２１、Ｖ２２、Ｖ２３ａ、Ｖ２４ａからなる平面と、頂点Ｖ２５ａ、Ｖ２６ａ、Ｖ２７、Ｖ２８からなる平面は平行である。また、頂点Ｖ２３ａは、頂点Ｖ２３から頂点Ｖ２７に接近した位置にあり、頂点Ｖ２４ａは、頂点Ｖ２４から頂点Ｖ２８に接近した位置にあり、頂点Ｖ２５ａは、頂点Ｖ２５から頂点Ｖ２１に接近した位置にあり、頂点Ｖ２６ａは、頂点Ｖ２６から頂点Ｖ２２に接近した位置にある。 The plane composed of the vertices V21, V22, V23a and V24a and the plane composed of the vertices V25a, V26a, V27 and V28 are parallel. The vertex V23a is located at a position approaching the vertex V27 from the vertex V23, the vertex V24a is located at a position approaching the vertex V28 from the vertex V24, the vertex V25a is located at a position approaching the vertex V21 from the vertex V25, The vertex V26a is located close to the vertex V22 from the vertex V26.
　こうして、立ち上げミラーＲ２は、反射面（頂点Ｖ２２、Ｖ２３ａ、Ｖ２７、Ｖ２６ａからなる面）とその反対側の面が平行四辺形となっている。平面視において、反射面の輪郭とその反対側の面の輪郭は、完全に一致する。また、反射面とその反対側の面は互いに平行である。立ち上げミラーＲ２は、反射面がＣＤ光とＤＶＤ光の光束を十分受光できるよう、Ｘ軸を回転軸として、反射面がＺ軸正方向を向くように４５度傾けられた状態で、ハウジングＨ内に配置される。 Thus, in the rising mirror R2, the reflecting surface (the surface composed of the vertices V22, V23a, V27, V26a) and the opposite surface are parallelograms. In plan view, the contour of the reflecting surface and the contour of the opposite surface completely coincide. The reflective surface and the opposite surface are parallel to each other. The rising mirror R2 has a housing H in a state where the reflecting surface is tilted 45 degrees so that the reflecting surface is directed in the positive direction of the Z-axis with the X axis as a rotation axis so that the reflecting surface can sufficiently receive the light beams of CD light and DVD light Placed inside.
　図４（ｃ）は、ハウジングＨ内に設置された立ち上げミラーＲ１を、Ｘ軸正方向に見た場合の側面図である。なお、立ち上げミラーＲ２の頂点Ｖ２５ａ、Ｖ２６ａ、Ｖ２７、Ｖ２８のＸ軸正方向側に、それぞれ、頂点Ｖ２１、Ｖ２２、Ｖ２３ａ、Ｖ２４ａが位置付けられている。 FIG. 4C is a side view when the rising mirror R1 installed in the housing H is viewed in the positive direction of the X axis. The vertices V21, V22, V23a, and V24a are positioned on the X axis positive direction side of the vertices V25a, V26a, V27, and V28 of the rising mirror R2, respectively.
　立ち上げミラーＲ１は、上述したように、反射面がＺ軸正方向を向くように４５度傾けられている。このように傾けられた立ち上げミラーＲ１は、ハウジングＨに形成された設置面Ｈ１１に設置される。すなわち、立ち上げミラーＲ１の頂点Ｖ１３、Ｖ１４、Ｖ１８ａ、Ｖ１７ａからなる面は、設置面Ｈ１１によって支持される。 As described above, the rising mirror R1 is inclined 45 degrees so that the reflecting surface faces the positive direction of the Z axis. The rising mirror R1 tilted in this way is installed on an installation surface H11 formed in the housing H. That is, the surface composed of the vertices V13, V14, V18a, and V17a of the rising mirror R1 is supported by the installation surface H11.
　このように立ち上げミラーＲ１が設置されると、コリメータレンズ１０５側からＸ軸正方向に進むＢＤ光は、立ち上げミラーＲ１の反射面上において、太い破線で示す反射領域に照射され、Ｚ軸正方向に反射される。 When the rising mirror R1 is installed in this way, the BD light traveling in the positive direction of the X axis from the collimator lens 105 side is irradiated on the reflection area indicated by the thick broken line on the reflecting surface of the rising mirror R1, and the Z axis Reflected in the positive direction.
　なお、図４（ｃ）に示すように、Ｘ軸正方向に見たとき、立ち上げミラーＲ２の上部（Ｚ軸負側の端部）が立ち上げミラーＲ１の側部（Ｙ軸正側の端部）に重なっている。しかし、立ち上げミラーＲ１は、立ち上げミラーＲ２よりも手前（Ｘ軸負側）にあるため、このように立ち上げミラーＲ２の上部が立ち上げミラーＲ１の側部に重なっていても、立ち上げミラーＲ１の反射面によって反射されたＢＤ光の光束が立ち上げミラーＲ２によって遮られる惧れはない。 As shown in FIG. 4C, when viewed in the positive direction of the X axis, the upper part of the rising mirror R2 (the end on the negative side of the Z axis) is the side of the rising mirror R1 (the positive side of the Y axis). (Over the edge). However, since the raising mirror R1 is located in front of the raising mirror R2 (X-axis negative side), even if the upper part of the raising mirror R2 overlaps the side of the raising mirror R1, the raising mirror R1 is raised. There is no possibility that the light beam of the BD light reflected by the reflecting surface of the mirror R1 is blocked by the rising mirror R2.
　図４（ｄ）は、ハウジングＨ内に設置された立ち上げミラーＲ２を、Ｙ軸正方向に見た場合の側面図である。なお、立ち上げミラーＲ１の頂点Ｖ１１ａ、Ｖ１２ａ、Ｖ１３、Ｖ１４のＹ軸正方向側に、それぞれ、頂点Ｖ１５、Ｖ１６、Ｖ１７ａ、Ｖ１８ａが位置付けられている。 FIG. 4D is a side view when the rising mirror R2 installed in the housing H is viewed in the positive direction of the Y axis. The vertices V15, V16, V17a, and V18a are positioned on the Y axis positive direction side of the vertices V11a, V12a, V13, and V14 of the rising mirror R1, respectively.
　立ち上げミラーＲ２は、上述したように、反射面がＺ軸正方向を向くように４５度傾けられている。このように傾けられた立ち上げミラーＲ２は、ハウジングＨに形成された設置面Ｈ２１に設置される。すなわち、立ち上げミラーＲ２の頂点Ｖ２３ａ、Ｖ２４ａ、Ｖ２８、Ｖ２７からなる面は、設置面Ｈ２１によって支持される。 As described above, the rising mirror R2 is inclined 45 degrees so that the reflecting surface faces the positive direction of the Z axis. The rising mirror R2 tilted in this way is installed on an installation surface H21 formed in the housing H. That is, the surface composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is supported by the installation surface H21.
　このように立ち上げミラーＲ２が設置されると、ハーフミラー２０２側からＹ軸正方向に進むＣＤ光とＤＶＤ光は、立ち上げミラーＲ２の反射面上において、太い破線で示す反射領域に照射され、Ｚ軸正方向に反射される。 When the rising mirror R2 is installed in this way, the CD light and the DVD light traveling in the Y-axis positive direction from the half mirror 202 side are irradiated on the reflection area indicated by the thick broken line on the reflecting surface of the rising mirror R2. , Reflected in the positive direction of the Z axis.
　このとき、Ｙ軸正方向に立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の光束よりもＺ軸正方向側（図４（ｄ）の下方向）に、立ち上げミラーＲ１の頂点Ｖ１４、Ｖ１８ａが位置付けられている。したがって、立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の光束が立ち上げミラーＲ１によって遮られることは無い。 At this time, the vertices V14 and V18a of the rising mirror R1 are closer to the Z-axis positive direction side (downward in FIG. 4D) than the luminous fluxes of the CD light and DVD light incident on the rising mirror R2 in the Y-axis positive direction. Is positioned. Therefore, the light fluxes of the CD light and the DVD light incident on the rising mirror R2 are not blocked by the rising mirror R1.
　なお、図４（ｃ）に示すように、Ｙ軸正方向に見たとき、立ち上げミラーＲ１の下部（Ｚ軸正側の端部）が立ち上げミラーＲ２の反射面の下部（Ｚ軸正側の端部）に重なっている。立ち上げミラーＲ１は、立ち上げミラーＲ２よりも手前（Ｙ軸負側）にあるため、このように立ち上げミラーＲ１の下部が立ち上げミラーＲ２の反射面の下部に重なっていると、立ち上げミラーＲ２の反射面によって反射されたＣＤ光とＤＶＤ光が立ち上げミラーＲ１によって遮られる惧れがある。しかし、本実施の形態では、上記のように立ち上げミラーＲ１の輪郭が平行四辺形であるため、以下のように、立ち上げミラーＲ２の反射面によって反射されたＣＤ光とＤＶＤ光が立ち上げミラーＲ１によって遮られることは無い。 As shown in FIG. 4C, when viewed in the positive direction of the Y axis, the lower part of the rising mirror R1 (the end on the positive side of the Z axis) is the lower part of the reflecting surface of the rising mirror R2 (the positive axis of the Z axis On the side edge). Since the raising mirror R1 is in front of the raising mirror R2 (Y-axis negative side), if the lower part of the raising mirror R1 overlaps the lower part of the reflecting surface of the raising mirror R2, the raising mirror R1 is raised. There is a possibility that CD light and DVD light reflected by the reflecting surface of the mirror R2 are blocked by the rising mirror R1. However, in the present embodiment, since the outline of the rising mirror R1 is a parallelogram as described above, CD light and DVD light reflected by the reflecting surface of the rising mirror R2 are raised as follows. It is not blocked by the mirror R1.
　図５（ａ）は、立ち上げミラーＲ１の替わりに、立ち上げミラーＲ３が用いられた場合の、立ち上げミラーＲ３と、ＣＤ光とＤＶＤ光の光束との位置関係を示す図である。 FIG. 5A is a diagram showing the positional relationship between the rising mirror R3 and the luminous fluxes of the CD light and the DVD light when the rising mirror R3 is used instead of the rising mirror R1.
　ここで、立ち上げミラーＲ３は、直方形形状を有しており、平面視において正方形形状の輪郭を有している。また、Ｚ軸正方向に反射されるＣＤ光とＤＶＤ光の中心と、Ｚ軸正方向に反射されるＢＤ光の中心との間隔は、上記立ち上げミラーＲ１が用いられる場合の間隔ｄと同様である。 Here, the rising mirror R3 has a rectangular shape, and has a square outline in plan view. Further, the distance between the center of the CD light and the DVD light reflected in the Z-axis positive direction and the center of the BD light reflected in the Z-axis positive direction is the same as the distance d when the rising mirror R1 is used. It is.
　立ち上げミラーＲ３のＺ軸正方向側の端部は、図４（ｃ）に示した立ち上げミラーＲ１と同様、Ｙ軸正方向に進むＣＤ光とＤＶＤ光よりもＺ軸正方向側に位置している。このため、立ち上げミラーＲ１が用いられる場合と同様、Ｙ軸正方向に進むＣＤとＤＶＤ光が立ち上げミラーＲ３によって遮られることはない。しかしながら、立ち上げミラーＲ２によってＺ軸正方向に反射されるＣＤ光とＤＶＤ光は、図５（ａ）に示すように、立ち上げミラーＲ３の内側方向の端部に掛かっている。これにより、Ｚ軸正方向に反射されたＣＤ光とＤＶＤ光の一部が、立ち上げミラーＲ３により遮られてしまう。 The end on the Z-axis positive direction side of the rising mirror R3 is positioned closer to the Z-axis positive direction side than the CD light and DVD light traveling in the Y-axis positive direction, like the rising mirror R1 shown in FIG. is doing. For this reason, as in the case where the rising mirror R1 is used, the CD and DVD light traveling in the positive Y-axis direction is not blocked by the rising mirror R3. However, CD light and DVD light reflected in the positive direction of the Z-axis by the rising mirror R2 are applied to the inner end of the rising mirror R3 as shown in FIG. As a result, part of the CD light and DVD light reflected in the positive direction of the Z axis is blocked by the rising mirror R3.
　これに対し、本実施例の立ち上げミラーＲ１が用いられる場合、立ち上げミラーＲ３の内側方向の端部に対応する部分、すなわち、図４（ａ）の頂点Ｖ１５、Ｖ１８、Ｖ１８ａ、Ｖ１６、Ｖ１７、Ｖ１７ａからなる三角柱部分が無いため、立ち上げミラーＲ２によってＺ軸正方向に反射されたＣＤ光とＤＶＤ光が、この三角柱部分によって遮られることがない。これにより、図３（ｂ）に示すように、Ｚ軸正方向に反射されるＢＤ光の中心位置と、Ｚ軸正方向に反射されるＣＤ光とＤＶＤ光の中心位置との間隔が幅ｄとなるよう、これら２つの中心位置を近づけても、Ｚ軸正方向に反射されるＣＤ光とＤＶＤ光が、立ち上げミラーＲ１の端部によって遮られることがない。 On the other hand, when the rising mirror R1 of this embodiment is used, the portion corresponding to the inner end of the rising mirror R3, that is, the vertices V15, V18, V18a, V16, V17 in FIG. Since there is no triangular prism portion made of V17a, CD light and DVD light reflected in the positive Z-axis direction by the rising mirror R2 are not blocked by this triangular prism portion. As a result, as shown in FIG. 3B, the distance between the center position of the BD light reflected in the positive Z-axis direction and the center position of the CD light and the DVD light reflected in the positive Z-axis direction is a width d. Thus, even if these two center positions are brought close to each other, the CD light and DVD light reflected in the positive Z-axis direction are not blocked by the end of the rising mirror R1.
　図５（ｂ）は、立ち上げミラーＲ２の替わりに、立ち上げミラーＲ４が用いられた場合の、立ち上げミラーＲ４と、外壁部Ｈ３と、内壁部Ｈ４との位置関係を示す図である。 FIG. 5B is a diagram showing a positional relationship among the rising mirror R4, the outer wall portion H3, and the inner wall portion H4 when the rising mirror R4 is used instead of the rising mirror R2.
　ここで、立ち上げミラーＲ４は、直方形形状を有しており、平面視において、正方形形状の輪郭を有している。また、Ｚ軸正方向に反射されるＣＤ光とＤＶＤ光の中心と、外壁部Ｈ３との間隔は、上記立ち上げミラーＲ２が用いられる場合と同様である。 Here, the rising mirror R4 has a rectangular shape, and has a square-shaped outline in plan view. Further, the distance between the center of the CD light and DVD light reflected in the positive direction of the Z axis and the outer wall H3 is the same as that when the rising mirror R2 is used.
　この場合、立ち上げミラーＲ４の内側方向の端部は、ターンテーブルの外周の形状に合わせて形成される外壁部Ｈ３よりも内側に突出している。このため、図２に示すように、内壁部Ｈ４に凹部Ｈ４ａを形成して、ハウジングＨの内部に立ち上げミラーＲ４を収めることができない。 In this case, the end portion of the rising mirror R4 in the inner direction protrudes inward from the outer wall portion H3 formed in accordance with the outer peripheral shape of the turntable. For this reason, as shown in FIG. 2, the recessed mirror H4a cannot be formed in the inner wall H4 and the rising mirror R4 cannot be accommodated inside the housing H.
　しかしながら、本実施例の立ち上げミラーＲ２が用いられる場合、立ち上げミラーＲ３の内側方向の端部に対応する部分、すなわち、図４（ｂ）の頂点Ｖ２１、Ｖ２４、Ｖ２４ａ、Ｖ２２、Ｖ２３、Ｖ２３ａからなる三角柱部分が無いため、立ち上げミラーＲ２の内側方向の端部（頂点Ｖ２３ａ、Ｖ２４ａ）が、外壁部Ｈ３よりも内側に突出することがない。これにより、図２に示すように、内壁部Ｈ４に内側方向に窪んだ凹部Ｈ４ａを形成することにより、ハウジングＨの内部に立ち上げミラーＲ２を収めることができる。 However, when the rising mirror R2 of this embodiment is used, the portion corresponding to the inner end of the rising mirror R3, that is, the vertices V21, V24, V24a, V22, V23, V23a in FIG. Since there is no triangular prism portion made of, end portions (vertices V23a, V24a) of the rising mirror R2 in the inner direction do not protrude inward from the outer wall portion H3. As a result, as shown in FIG. 2, the rising mirror R <b> 2 can be housed inside the housing H by forming a recess H <b> 4 a that is recessed inward in the inner wall portion H <b> 4.
　＜実施例１の効果＞
　以上、本実施例によれば、以下の効果が奏され得る。 <Effect of Example 1>
As described above, according to this embodiment, the following effects can be obtained.
　図４（ａ）に示すように、立ち上げミラーＲ１が平行四辺形の形状を有するため、設置状態において、立ち上げミラーＲ１の内側方向の端部が、立ち上げミラーＲ２によってＺ軸正方向に反射されたＣＤ光とＤＶＤ光の光束の光軸Ａ２２から離れる。このため、図５（ａ）に示すような立ち上げミラーＲ３が用いられる場合に比べて、立ち上げミラーＲ１、Ｒ２を互いに接近させることができ、これにより、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系とを互いに接近させることができる。よって、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系とを合わせた光学系全体の配置スペースをコンパクトにすることができ、結果、光ピックアップ装置の小型化が可能となる。 As shown in FIG. 4A, since the rising mirror R1 has a parallelogram shape, in the installed state, the inner end of the rising mirror R1 is moved in the positive direction of the Z axis by the rising mirror R2. The reflected CD light and DVD light are separated from the optical axis A22. Therefore, compared to the case where the rising mirror R3 as shown in FIG. 5A is used, the rising mirrors R1 and R2 can be brought closer to each other, whereby the BD optical system and the CD / DVD are used. The optical system can be brought close to each other. Therefore, the arrangement space of the entire optical system including the BD optical system and the CD / DVD optical system can be made compact, and as a result, the optical pickup device can be miniaturized.
　また、このように立ち上げミラーＲ１、Ｒ２を互いに接近させることができるため、図１（ｂ）のように、ＢＤ用対物レンズ１０７が、ＣＤ／ＤＶＤ用対物レンズ２０３よりも外側方向に位置付けられる場合に、内側の立ち上げミラーＲ２を配置するためのスペースを広げることができる。これにより、図２に示すように、外壁部Ｈ３と立ち上げミラーＲ１との間に立ち上げミラーＲ２を配置するためのスペースを確保することが可能となる。 Further, since the rising mirrors R1 and R2 can be brought close to each other in this way, the BD objective lens 107 is positioned outward from the CD / DVD objective lens 203 as shown in FIG. In this case, a space for arranging the inner rising mirror R2 can be widened. Thereby, as shown in FIG. 2, it is possible to secure a space for disposing the rising mirror R2 between the outer wall portion H3 and the rising mirror R1.
　また、図４（ｂ）に示すように、立ち上げミラーＲ２が平行四辺形の形状を有するため、設置状態において、立ち上げミラーＲ２のターンテーブル側の端部を、外壁部Ｈ３よりもハウジングＨの内側に位置付けることができる。すなわち、図５（ｂ）に示すような立ち上げミラーＲ４が用いられる場合に比べて、立ち上げミラーＲ２のターンテーブル側の端部を、ターンテーブルから離れる方向にシフトさせることができる。このため、立ち上げミラーＲ２のこの端部を、ハウジングＨ内に収め易くなる。さらに、ハウジングＨの内壁部Ｈ４に凹部Ｈ４ａが形成されているため、ハウジングＨの内部に立ち上げミラーＲ２を収めることが可能となる。 Further, as shown in FIG. 4B, since the rising mirror R2 has a parallelogram shape, in the installed state, the end on the turntable side of the rising mirror R2 is located more in the housing H than the outer wall H3. Can be positioned inside. That is, as compared with the case where the rising mirror R4 as shown in FIG. 5B is used, the end of the rising mirror R2 on the turntable side can be shifted in the direction away from the turntable. For this reason, this end portion of the rising mirror R2 is easily accommodated in the housing H. Furthermore, since the recess H4a is formed in the inner wall H4 of the housing H, the rising mirror R2 can be housed inside the housing H.
　また、立ち上げミラーＲ１、Ｒ２は、平行四辺形の輪郭を有するため、立ち上げミラーＲ１、Ｒ２を、原板から無駄なく簡易に切り出すことができる。これにより、立ち上げミラーＲ１、Ｒ２の生産コストを低く抑えることが可能となる。 Further, since the raising mirrors R1 and R2 have a parallelogram outline, the raising mirrors R1 and R2 can be easily cut out from the original plate without waste. Thereby, it is possible to keep the production cost of the rising mirrors R1 and R2 low.
　＜実施例２＞
　上記実施例１では、立ち上げミラーＲ１、Ｒ２が、図４（ａ）、（ｂ）に示すような形状とされ、反射面が４５度傾くようにして、ハウジングＨに配置された。本実施例では、さらに立ち上げミラーＲ１、Ｒ２が、上記実施例１の状態から、反射面に垂直な方向を中心軸として所定角度だけ回転された状態で、ハウジングＨに配置される。 <Example 2>
In the first embodiment, the raising mirrors R1 and R2 have a shape as shown in FIGS. 4A and 4B, and are arranged in the housing H so that the reflection surface is inclined by 45 degrees. In the present embodiment, the rising mirrors R1 and R2 are further disposed on the housing H in a state rotated from the state of the first embodiment by a predetermined angle about the direction perpendicular to the reflecting surface as the central axis.
　本実施例では、図２に示す状態から、立ち上げミラーＲ１、Ｒ２が所定角度だけ回転されている。具体的には、立ち上げミラーＲ１は、図６（ａ）に示すように、反射面の中心を通り、反射面に垂直な直線を中心として所定の角度だけ回転される。この回転方向は、反射面と反対側の面から立ち上げミラーＲ１を見た場合に、反時計回りである。立ち上げミラーＲ２は、図６（ｂ）に示すように、反射面の中心を通り、反射面に垂直な直線を中心として所定角度だけ回転される。この回転方向は、反射面と反対側の面から立ち上げミラーＲ２を見た場合に、時計回りである。 In this embodiment, the raising mirrors R1 and R2 are rotated by a predetermined angle from the state shown in FIG. Specifically, as shown in FIG. 6A, the rising mirror R1 is rotated by a predetermined angle around a straight line that passes through the center of the reflecting surface and is perpendicular to the reflecting surface. This rotation direction is counterclockwise when the rising mirror R1 is viewed from the surface opposite to the reflecting surface. As shown in FIG. 6B, the rising mirror R2 passes through the center of the reflecting surface and is rotated by a predetermined angle around a straight line perpendicular to the reflecting surface. This rotation direction is clockwise when the rising mirror R2 is viewed from the surface opposite to the reflecting surface.
　図６（ｃ）は、本実施例の立ち上げミラーＲ１、Ｒ２の近傍を示す図である。図６（ｃ）には、上記実施例１の状態から、図６（ａ）、（ｂ）に示すように回転させられた立ち上げミラーＲ１、Ｒ２と共に、立ち上げミラーＲ２の内側方向のハウジングＨが示されている。
FIG. 6C is a view showing the vicinity of the rising mirrors R1 and R2 of the present embodiment. FIG. 6C shows the housing in the inner direction of the rising mirror R2 together with the rising mirrors R1 and R2 rotated as shown in FIGS. 6A and 6B from the state of the first embodiment. H is shown.
　このように立ち上げミラーＲ１が回転されると、立ち上げミラーＲ１の頂角Ｖ１７ａ、Ｖ１８ａは、上記実施例１の場合に比べて、さらにＺ軸正方向に反射するＣＤ光とＤＶＤ光の光束から離れることになる。このため、上記実施例１の場合よりも、立ち上げミラーＲ２により反射されたＣＤ／ＤＶＤ光が、立ち上げミラーＲ１の端部（頂角Ｖ１７ａ、Ｖ１８ａの部分）により遮られにくくなる。これにより、上記実施例１に比べて、ＣＤ／ＤＶＤ用光学系を幅Δｄだけ外側方向に位置付けることができる。 When the raising mirror R1 is rotated in this way, the apex angles V17a and V18a of the raising mirror R1 are further reflected in the Z-axis positive direction as compared with the case of the first embodiment. Will leave. Therefore, the CD / DVD light reflected by the rising mirror R2 is less likely to be blocked by the end portions (vertical angles V17a and V18a) of the rising mirror R1 than in the case of the first embodiment. As a result, the CD / DVD optical system can be positioned outward by the width Δd as compared with the first embodiment.
　また、上記のように立ち上げミラーＲ２が回転されると、立ち上げミラーＲ２の頂角Ｖ２３ａ、Ｖ２４ａは、上記実施例１の場合に比べて、さらに外壁部Ｈ３から離れることになる。これにより、上記実施例１に比べて、内壁部Ｈ４に凹部Ｈ４ａが形成された壁の部分の厚みを大きくすることができ、この部分の強度を高めることができる。 Further, when the raising mirror R2 is rotated as described above, the apex angles V23a and V24a of the raising mirror R2 are further away from the outer wall H3 as compared with the case of the first embodiment. Thereby, compared with the said Example 1, the thickness of the part of the wall in which the recessed part H4a was formed in the inner wall part H4 can be enlarged, and the intensity | strength of this part can be raised.
　図７（ａ）は、ハウジングＨ内に設置された立ち上げミラーＲ１を、Ｘ軸正方向に見た場合の側面図である。 FIG. 7A is a side view of the rising mirror R1 installed in the housing H when viewed in the positive direction of the X axis.
　立ち上げミラーＲ１は、上述したように、反射面の中心を通り、反射面に垂直な直線を中心として所定角度だけ回転されている。このように回転された立ち上げミラーＲ１は、ハウジングＨに形成された設置面Ｈ１２に設置される。すなわち、立ち上げミラーＲ１の頂点Ｖ１３、Ｖ１４、Ｖ１８ａ、Ｖ１７ａからなる面は、設置面Ｈ１２によって支持される。 As described above, the rising mirror R1 passes through the center of the reflecting surface and is rotated by a predetermined angle around a straight line perpendicular to the reflecting surface. The rising mirror R1 thus rotated is installed on an installation surface H12 formed in the housing H. That is, the surface composed of the vertices V13, V14, V18a, and V17a of the rising mirror R1 is supported by the installation surface H12.
　図７（ｂ）は、ハウジングＨ内に設置された立ち上げミラーＲ２を、Ｙ軸正方向に見た場合の側面図である。 FIG. 7B is a side view of the rising mirror R2 installed in the housing H when viewed in the positive direction of the Y axis.
　立ち上げミラーＲ２は、上述したように、反射面の中心を通り、反射面に吸い超ｋな直線を中心として回転されている。このように回転された立ち上げミラーＲ２は、ハウジングＨに形成された設置面Ｈ２２に設置される。すなわち、立ち上げミラーＲ２の頂点Ｖ２３ａ、Ｖ２４ａ、Ｖ２８、Ｖ２７からなる面は、設置面Ｈ２２によって支持される。 As described above, the rising mirror R2 passes through the center of the reflecting surface and is rotated around a straight line that is absorbed by the reflecting surface. The rising mirror R2 thus rotated is installed on an installation surface H22 formed in the housing H. That is, the surface composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is supported by the installation surface H22.
　この場合も、Ｙ軸正方向に立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の光束よりもＺ軸正方向側（図７（ｄ）の下方向）に、立ち上げミラーＲ１の頂点Ｖ１８ａが位置付けられている。 Also in this case, the vertex V18a of the rising mirror R1 is closer to the Z-axis positive direction side (downward in FIG. 7D) than the luminous fluxes of the CD light and the DVD light incident on the rising mirror R2 in the Y-axis positive direction. It is positioned.
　図８は、本実施例における光ピックアップ装置の具体的構成例を示す図である。図８には、光ピックアップ装置を裏側から見たときの斜視図が示されている。図８に示す光ピックアップ装置は、図６（ｂ）に示すように立ち上げミラーＲ１、Ｒ２の近傍を除き、図２に示した構成と略同じであるため、説明を省略する。 FIG. 8 is a diagram showing a specific configuration example of the optical pickup device in the present embodiment. FIG. 8 is a perspective view of the optical pickup device as viewed from the back side. The optical pickup device shown in FIG. 8 is substantially the same as the configuration shown in FIG. 2 except for the vicinity of the rising mirrors R1 and R2 as shown in FIG.
　なお、図８に示す具体的構成例では、回折格子１０２は、ホルダ１０２ａによってハウジングＨ内に固定されている。このようにハウジングＨ内に、図７に示す光学部品が設置された後、ハウジングＨにカバーが設置される。また、ＢＤ用対物レンズ１０７と、ＣＤ／ＤＶＤ用対物レンズ２０３と、ホルダ３０１と、対物レンズアクチュエータ３０２は、ハウジングＨの表側に装着される。 In the specific configuration example shown in FIG. 8, the diffraction grating 102 is fixed in the housing H by the holder 102a. Thus, after the optical component shown in FIG. 7 is installed in the housing H, a cover is installed in the housing H. Further, the BD objective lens 107, the CD / DVD objective lens 203, the holder 301, and the objective lens actuator 302 are mounted on the front side of the housing H.
　また、この具体的構成例では、コリメータレンズ１０５側から立ち上げミラーＲ１に入射するＢＤ光の進行方向は、図２に示すＸ軸正方向からＸＹ平面内において僅かにずれている。また、ハーフミラー２０２側から立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の進行方向は、図２に示すＹ軸正方向からＸＹ平面内において僅かにずれている。 In this specific configuration example, the traveling direction of the BD light incident on the rising mirror R1 from the collimator lens 105 side is slightly shifted in the XY plane from the positive X-axis direction shown in FIG. Further, the traveling directions of the CD light and the DVD light incident on the rising mirror R2 from the half mirror 202 side are slightly shifted in the XY plane from the Y axis positive direction shown in FIG.
　図９（ａ）、（ｂ）は、立ち上げミラーＲ１、Ｒ２が設置されるハウジングＨの部分を拡大した図である。 FIGS. 9A and 9B are enlarged views of a portion of the housing H where the rising mirrors R1 and R2 are installed.
　本実施例の具体的構成例では、図７（ａ）に示した設置面Ｈ１２には、設置面Ｈ１２に平行で僅かに盛り上がった突起面Ｈ１２ａが形成されている。また、ハウジングＨには、立ち上げミラーＲ１の反射面を支持するための設置面Ｈ１３、Ｈ１４が設けられている。設置面Ｈ１３、Ｈ１４には、それぞれ、設置面Ｈ１３、Ｈ１４に平行で僅かに盛り上がった突起面Ｈ１３ａ、Ｈ１４ａが形成されている。立ち上げミラーＲ１の頂点Ｖ１３、Ｖ１４、Ｖ１８ａ、Ｖ１７ａからなる平面は、突起面Ｈ１２ａに支持されるようハウジングＨに固定され、頂点Ｖ１２ａ、Ｖ１３、Ｖ１７ａ、Ｖ１６からなる平面（反射面）は、突起面Ｈ１３ａ、Ｈ１４ａによって支持されるよう、立ち上げミラーＲ１がハウジングＨに固定される。 In the specific configuration example of the present embodiment, the installation surface H12 shown in FIG. 7A is formed with a protruding surface H12a which is parallel to the installation surface H12 and slightly raised. The housing H is provided with installation surfaces H13 and H14 for supporting the reflecting surface of the rising mirror R1. On the installation surfaces H13 and H14, there are formed projecting surfaces H13a and H14a that are parallel to the installation surfaces H13 and H14 and are slightly raised. The plane composed of the vertices V13, V14, V18a and V17a of the rising mirror R1 is fixed to the housing H so as to be supported by the projection surface H12a, and the plane (reflection surface) composed of the vertices V12a, V13, V17a and V16 is a projection. The rising mirror R1 is fixed to the housing H so as to be supported by the surfaces H13a and H14a.
　本実施例の具体的構成例では、図７（ｂ）に示した設置面Ｈ２２には、設置面Ｈ２２に平行で僅かに盛り上がった突起面Ｈ２２ａが形成されている。また、ハウジングＨには、立ち上げミラーＲ２の反射面を支持するための設置面Ｈ２３、Ｈ２４が設けられている。設置面Ｈ２３、Ｈ２４には、それぞれ、設置面Ｈ２３、Ｈ２４に平行で僅かに盛り上がった突起面Ｈ２３ａ、Ｈ２４ａが形成されている。立ち上げミラーＲ２の頂点Ｖ２３ａ、Ｖ２４ａ、Ｖ２８、Ｖ２７からなる平面は、突起面Ｈ２２ａに支持されるようハウジングＨに固定され、頂点Ｖ２２、Ｖ２３ａ、Ｖ２７、Ｖ２６ａからなる平面（反射面）は、突起面Ｈ２３ａ、Ｈ２４ａによって支持されるよう、立ち上げミラーＲ２がハウジングＨに固定される。 In the specific configuration example of the present embodiment, the installation surface H22 shown in FIG. 7B is formed with a protruding surface H22a which is parallel to the installation surface H22 and slightly raised. The housing H is provided with installation surfaces H23 and H24 for supporting the reflecting surface of the rising mirror R2. On the installation surfaces H23 and H24, there are formed projecting surfaces H23a and H24a that are parallel to the installation surfaces H23 and H24 and are slightly raised. The plane composed of the vertices V23a, V24a, V28, V27 of the rising mirror R2 is fixed to the housing H so as to be supported by the projection surface H22a, and the plane (reflection surface) composed of the vertices V22, V23a, V27, V26a is a projection. The rising mirror R2 is fixed to the housing H so as to be supported by the surfaces H23a and H24a.
　また、凹部Ｈ４ａの底面には、立ち上げミラーＲ２の頂点Ｖ２１、Ｖ２２、Ｖ２３ａ、Ｖ２４ａからなる平面に平行な壁面Ｈ４ｂが形成されている。壁面Ｈ４ｂに、頂点Ｖ２１、Ｖ２２、Ｖ２３ａ、Ｖ２４ａからなる平面が接するように、立ち上げミラーＲ２がハウジングＨに設置される。 Further, on the bottom surface of the recess H4a, a wall surface H4b parallel to a plane formed by the vertices V21, V22, V23a, V24a of the rising mirror R2 is formed. The rising mirror R2 is installed in the housing H so that the plane composed of the vertices V21, V22, V23a, and V24a is in contact with the wall surface H4b.
　なお、図９（ａ）、（ｂ）に示す具体的構成例では、設置面Ｈ１２～Ｈ１４、Ｈ２２～Ｈ２４に、突起面Ｈ１２ａ～Ｈ１４ａ、Ｈ２２ａ～Ｈ２４ａが形成されたが、これら突起面は形成されずに、設置面に立ち上げミラーＲ１、Ｒ２が支持されるよう、立ち上げミラーＲ１、Ｒ２がハウジングＨに固定されても良い。 In the specific configuration example shown in FIGS. 9A and 9B, the projecting surfaces H12a to H14a and H22a to H24a are formed on the installation surfaces H12 to H14 and H22 to H24, but these projecting surfaces are formed. Instead, the raising mirrors R1 and R2 may be fixed to the housing H so that the raising mirrors R1 and R2 are supported on the installation surface.
　＜実施例２の効果＞
　以上、本実施例によれば、以下の効果が奏され得る。 <Effect of Example 2>
As described above, according to this embodiment, the following effects can be obtained.
　立ち上げミラーＲ２の位置を、上記実施例１に比べて、幅Δｄだけさらに外側方向（ターンテーブルから離れる方向）に位置付けることができるため、外壁部Ｈ３と立ち上げミラーＲ１との間のスペースをさらに広げることができる。このため、上記実施例１よりも、立ち上げミラーＲ２を配置し易くなる。 Since the position of the rising mirror R2 can be positioned further outward (in the direction away from the turntable) by the width Δd than in the first embodiment, the space between the outer wall portion H3 and the rising mirror R1 is increased. It can be further expanded. For this reason, it becomes easier to arrange the raising mirror R2 than in the first embodiment.
　また、立ち上げミラーＲ２の頂角Ｖ２３ａ、Ｖ２４ａを、上記実施例１に比べて、さらに外側方向（ターンテーブルから離れる方向）に位置付けることができるため、外壁部Ｈ３と頂角Ｖ２３ａ、Ｖ２４ａとの間隔を大きくできる。これにより、内壁部Ｈ４に凹部Ｈ４ａが形成された部分の壁の厚み（ターンテーブル側に最も入り込んだ部分の凹部Ｈ４ａの壁面と外壁部Ｈ３の壁面との距離）が、上記実施例１に比べて大きくなる。これにより、上記実施例１に比べて、凹部Ｈ４ａにおけるハウジングＨの強度を上げることができる。 Further, since the apex angles V23a and V24a of the rising mirror R2 can be positioned further outward (in a direction away from the turntable) as compared with the first embodiment, the outer wall H3 and the apex angles V23a and V24a The interval can be increased. Thereby, the wall thickness of the portion where the concave portion H4a is formed in the inner wall portion H4 (distance between the wall surface of the concave portion H4a and the wall surface of the outer wall portion H3 of the portion that has entered most into the turntable side) is compared with the first embodiment. Become bigger. Thereby, compared with the said Example 1, the intensity | strength of the housing H in the recessed part H4a can be raised.
　なお、図８の具体的構成例では、コリメータレンズ１０５側から立ち上げミラーＲ１に入射するＢＤ光の進行方向は、図２に示す状態から僅かにずれおり、ハーフミラー２０２側から立ち上げミラーＲ２に入射するＣＤ光とＤＶＤ光の進行方向は、図２に示す状態から僅かにずれている。しかしながら、この場合も、上述したような実施例１、２と同様の効果が奏され得る。 In the specific configuration example of FIG. 8, the traveling direction of the BD light incident on the rising mirror R1 from the collimator lens 105 side is slightly shifted from the state shown in FIG. 2, and the rising mirror R2 from the half mirror 202 side. The traveling directions of the CD light and the DVD light incident on the light are slightly shifted from the state shown in FIG. However, in this case, the same effects as those of the first and second embodiments can be obtained.
　以上、本発明の実施の形態について説明したが、本発明は、上記実施の形態に何ら制限されるものではなく、また、本発明の実施の形態も上記以外に種々の変更が可能である。 Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications other than the above can be made to the embodiment of the present invention.
　たとえば、上記実施の形態では、図１（ｂ）に示すように、ＢＤ用対物レンズ１０７が、ＣＤ／ＤＶＤ用対物レンズ２０３よりも外側方向に位置付けられたが、これに限らず、図１（ａ）に示すように、ＢＤ用対物レンズ１０７が、ＣＤ／ＤＶＤ用対物レンズ２０３よりも内側方向に位置付けられても良い。この場合、上述したように、図１（ｂ）のように配置する場合に比べて光ピックアップ装置が大型になってしまう。 For example, in the above embodiment, as shown in FIG. 1B, the BD objective lens 107 is positioned outward from the CD / DVD objective lens 203. However, the present invention is not limited to this. As shown in a), the BD objective lens 107 may be positioned inward of the CD / DVD objective lens 203. In this case, as described above, the optical pickup device becomes larger than the case where it is arranged as shown in FIG.
　しかしながら、ＢＤ用光学系の立ち上げミラーとＣＤ／ＤＶＤ用光学系の立ち上げミラーを、上記実施例１、２と同様、一方の立ち上げミラーによって反射されたレーザ光を他方の立ち上げミラーが遮らないように、平行四辺形の輪郭に形成することにより、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系とを互いに接近させることができ、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系とを合わせた全体の光学系の配置スペースを縮小することができる。また、上記実施例２と同様、それぞれの立ち上げミラーを所定角度だけ回転させることにより、ＢＤ用光学系とＣＤ／ＤＶＤ用光学系とを合わせた全体の光学系の配置スペースをさらに縮小することができる。さらに、内壁部Ｈ４に凹部Ｈ４ａが形成されれば、光学系をターンテーブルに接近する方向にシフトさせることができる。よって、光ピックアップ装置をコンパクトにすることができる。 However, the rising mirror of the optical system for BD and the rising mirror of the optical system for CD / DVD are the same as in the first and second embodiments, and the other rising mirror reflects the laser beam reflected by one of the rising mirrors. BD optical system and CD / DVD optical system can be brought close to each other by forming a parallelogram outline so as not to block, and the BD optical system and CD / DVD optical system are combined. Moreover, the arrangement space of the entire optical system can be reduced. Further, as in the second embodiment, the arrangement space of the entire optical system including the BD optical system and the CD / DVD optical system can be further reduced by rotating each raising mirror by a predetermined angle. Can do. Furthermore, if the recessed part H4a is formed in the inner wall part H4, the optical system can be shifted in a direction approaching the turntable. Therefore, the optical pickup device can be made compact.
　また、上記実施の形態では、立ち上げミラーＲ１、Ｒ２は、平面視において平行四辺形の輪郭となるように形成されたが、これに限らず、頂点Ｖ１７、Ｖ１８の近傍が取り除かれれば、立ち上げミラーＲ１の輪郭は他の輪郭であっても良く、また、頂点Ｖ２３、Ｖ２４の近傍が取り除かれれば、立ち上げミラーＲ２は他の輪郭であっても良い。 In the above embodiment, the rising mirrors R1 and R2 are formed to have a parallelogram outline in plan view. However, the present invention is not limited to this, and if the vicinity of the vertices V17 and V18 is removed, the rising mirrors R1 and R2 The outline of the raising mirror R1 may be another outline, and the raising mirror R2 may have another outline as long as the vicinity of the vertices V23 and V24 is removed.
　たとえば、立ち上げミラーＲ１は、図４（ａ）に点線で示す直方体の形状から、図１０（ａ）に示すように、頂点Ｖ１５、Ｖ１８、Ｖ１８ａ、Ｖ１６、Ｖ１７、Ｖ１７ａからなる三角柱部分のみが取り除かれ、頂点Ｖ１１ａ、Ｖ１２ａを含む部分は残っている形状であっても良い。同様に、立ち上げミラーＲ２は、図４（ｂ）に点線で示す直方体の形状から、図１０（ｂ）に示すように、頂点Ｖ２１、Ｖ２４、Ｖ２４ａ、Ｖ２２、Ｖ２３、Ｖ２３ａからなる三角柱部分のみが取り除かれ、頂点Ｖ２５ａ、Ｖ２６ａを含む部分は残っている輪郭であっても良い。 For example, the rising mirror R1 has only a triangular prism portion composed of vertices V15, V18, V18a, V16, V17, and V17a as shown in FIG. 10A from the shape of a rectangular parallelepiped indicated by a dotted line in FIG. The portion that is removed and includes the vertices V11a and V12a may have a remaining shape. Similarly, the rising mirror R2 has only a triangular prism portion composed of vertices V21, V24, V24a, V22, V23, and V23a as shown in FIG. 10B from the rectangular parallelepiped shape shown in FIG. 4B. May be removed, and the portion including the vertices V25a and V26a may be a remaining contour.
　また、図１０（ｃ）に示すように、平面視における立ち上げミラーＲ１の輪郭が台形となるよう、図４（ａ）に点線で示す直方体の形状から、頂点Ｖ１１、Ｖ１４、Ｖ１４ａ、Ｖ１２、Ｖ１３、Ｖ１３ａからなる三角柱部分が取り除かれた形状であっても良い。同様に、図１０（ｄ）に示すように、平面視における立ち上げミラーＲ２の輪郭が台形となるよう、図４（ｂ）に点線で示す直方体の形状から、頂点Ｖ２５、Ｖ２８、Ｖ２８ａ、Ｖ２６、Ｖ２７、Ｖ２７ａからなる三角柱部分が取り除かれても良い。 Further, as shown in FIG. 10C, from the shape of the rectangular parallelepiped indicated by the dotted line in FIG. 4A, the vertices V11, V14, V14a, V12, The shape from which the triangular prism part which consists of V13 and V13a was removed may be sufficient. Similarly, as shown in FIG. 10 (d), the vertices V25, V28, V28a, V26 are formed from the rectangular parallelepiped shape shown in FIG. 4 (b) so that the outline of the rising mirror R2 in a plan view becomes a trapezoid. , V27, V27a may be removed.
　また、図１０（ｅ）に示すように、立ち上げミラーＲ１は、図４（ａ）に点線で示す直方体の形状から、頂点Ｖ１８、Ｖ１８ａ、Ｖ１９ａ、Ｖ１７、Ｖ１７ａ、Ｖ１９ｂからなる三角柱が取り除かれた形状であっても良い。同様に、図１０（ｆ）に示すように、立ち上げミラーＲ２は、図４（ｂ）に点線で示す直方体の形状から、頂点Ｖ２３、Ｖ２３ａ、Ｖ２９ａ、Ｖ２４、Ｖ２４ａ、Ｖ２９ｂからなる三角柱が取り除かれた形状であっても良い。 Further, as shown in FIG. 10 (e), the rising mirror R1 has a triangular prism composed of vertices V18, V18a, V19a, V17, V17a, and V19b removed from the rectangular parallelepiped shape shown in FIG. 4 (a). The shape may be different. Similarly, as shown in FIG. 10 (f), the rising mirror R2 removes the triangular prism composed of vertices V23, V23a, V29a, V24, V24a, and V29b from the rectangular parallelepiped shape shown in FIG. 4 (b). The shape may be different.
　図１０（ａ）、（ｃ）、（ｅ）のように立ち上げミラーＲ１が構成される場合、図４（ａ）の立ち上げミラーＲ１に比べて、原板から立ち上げミラーＲ１を切り出す際の切出工程が多くなるものの、上記実施の形態と同様、頂点Ｖ１７、Ｖ１８の近傍の三角柱部分が取り除かれるため、この部分が、Ｚ軸正方向に反射されたＣＤ光とＤＶＤ光に掛からなくなる。また、図１０（ｂ）、（ｄ）、（ｆ）のように立ち上げミラーＲ２が構成される場合、図４（ｂ）の立ち上げミラーＲ２に比べて、原板から立ち上げミラーＲ２を切り出す際の切出工程が多くなるものの、上記実施の形態と同様、頂点Ｖ２３、Ｖ２４の近傍の三角柱部分が取り除かれるため、この部分が、外壁部Ｈ３よりも外側（ハウジングＨの内部側）に位置付けられる。 When the rising mirror R1 is configured as shown in FIGS. 10A, 10C, and 10E, the rising mirror R1 is cut out from the original plate as compared with the rising mirror R1 shown in FIG. Although the number of cutting steps increases, the triangular prism portion in the vicinity of the vertices V17 and V18 is removed as in the above-described embodiment, so that this portion is not affected by the CD light and DVD light reflected in the positive Z-axis direction. Further, when the rising mirror R2 is configured as shown in FIGS. 10B, 10D, and 10F, the rising mirror R2 is cut out from the original plate as compared with the rising mirror R2 shown in FIG. However, since the triangular prism portion in the vicinity of the vertices V23 and V24 is removed as in the above-described embodiment, this portion is positioned outside the outer wall portion H3 (inside the housing H). It is done.
　また、上記実施の形態では、立ち上げミラーＲ１、Ｒ２の対向する側面は、互いに平行であったが、これに限らず、平行でなくても良い。また、平面視における立ち上げミラーＲ１の形状は、図４（ａ）に示す状態から左右反転した形状であっても良い。すなわち、頂点Ｖ１１ａは、頂点Ｖ１１から頂点Ｖ１４に接近した位置にあり、頂点Ｖ１２ａは、頂点Ｖ１２から頂点Ｖ１３に接近した位置にあり、頂点Ｖ１７ａは、頂点Ｖ１７から頂点Ｖ１６に接近した位置にあり、頂点Ｖ１８ａは、頂点Ｖ１８から頂点Ｖ１５に接近した位置にあっても良い。また、平面視における立ち上げミラーＲ２の形状は、図４（ｂ）に示す状態から左右反転した形状であっても良い。すなわち、頂点Ｖ２３ａは、頂点Ｖ２３から頂点Ｖ２２に接近した位置にあり、頂点Ｖ２４ａは、頂点Ｖ２４から頂点Ｖ２１に接近した位置にあり、頂点Ｖ２５ａは、頂点Ｖ２５から頂点Ｖ２８に接近した位置にあり、頂点Ｖ２６ａは、頂点Ｖ２６から頂点Ｖ２７に接近した位置にあっても良い。 In the above embodiment, the opposing side surfaces of the rising mirrors R1 and R2 are parallel to each other. However, the present invention is not limited to this and may not be parallel. Further, the shape of the rising mirror R1 in a plan view may be a shape that is horizontally reversed from the state shown in FIG. That is, the vertex V11a is at a position approaching the vertex V14 from the vertex V11, the vertex V12a is at a position approaching the vertex V13 from the vertex V12, the vertex V17a is at a position approaching the vertex V16 from the vertex V17, The vertex V18a may be at a position close to the vertex V15 from the vertex V18. Further, the shape of the rising mirror R2 in a plan view may be a shape that is horizontally reversed from the state shown in FIG. That is, the vertex V23a is located at a position approaching the vertex V22 from the vertex V23, the vertex V24a is located at a position approaching the vertex V21 from the vertex V24, the vertex V25a is located at a position approaching the vertex V28 from the vertex V25, The vertex V26a may be at a position close to the vertex V27 from the vertex V26.
　さらに、上記実施の形態では、ＢＤ、ＤＶＤ、ＣＤに対応可能な光ピックアップ装置が例示されたが、本発明は、これに限らず、２つの対物レンズと、各対物レンズにそれぞれ対応する２つの立ち上げミラーを有する光ピックアップ装置に適用可能である。たとえば、本発明は、ＢＤ、ＤＶＤ、ＣＤのうち２つに対応可能な光ピックアップ装置にも適用可能である。 Furthermore, in the above embodiment, an optical pickup device that can handle BD, DVD, and CD has been exemplified. However, the present invention is not limited to this, and there are two objective lenses and two objective lenses corresponding to each objective lens. The present invention can be applied to an optical pickup device having a rising mirror. For example, the present invention can be applied to an optical pickup device that can handle two of BD, DVD, and CD.
　また、上記実施の形態では、光軸Ａ２１が光軸Ａ１１に対してＸＹ平面の面内方向において略９０傾いていたが、光軸Ａ１１に対する光軸Ａ２１の傾き角は、これに限らず、光学系のレイアウトに応じて、種々の変更が可能である。また、各光学系を構成する部品も、上記に限られず、一部の部材を省略し、あるいは、一部の部材を追加しても良い。 In the above-described embodiment, the optical axis A21 is inclined by approximately 90 in the in-plane direction of the XY plane with respect to the optical axis A11. However, the inclination angle of the optical axis A21 with respect to the optical axis A11 is not limited to this, and optical Various modifications are possible depending on the layout of the system. Also, the parts constituting each optical system are not limited to the above, and some members may be omitted or some members may be added.
　なお、上記実施例１では、立ち上げミラーＲ１の内周側が図４（ａ）に示すように光軸Ａ２２から離れる方向にカットされた。さらに、上記実施例２では、立ち上げミラーＲ１が、図６（ａ）に示すように回転された。しかしながら、立ち上げミラーＲ１をカットする方法と、立ち上げミラーＲ１を回転させる方法は、立ち上げミラーＲ１を光軸Ａ２２から離すための方法として、単独または組み合わせて用いられ得るものである。 In Example 1, the inner peripheral side of the rising mirror R1 was cut away from the optical axis A22 as shown in FIG. Further, in the second embodiment, the raising mirror R1 is rotated as shown in FIG. However, the method of cutting the raising mirror R1 and the method of rotating the raising mirror R1 can be used alone or in combination as a method for separating the raising mirror R1 from the optical axis A22.
　この他、本発明の実施の形態は、特許請求の範囲に示された技術的思想の範囲内において、適宜、種々の変更が可能である。 In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.
　　１０１　…　半導体レーザ（第１のレーザ光源）
　　１０７　…　ＢＤ用対物レンズ（第１の対物レンズ）
　　２０１　…　半導体レーザ（第２のレーザ光源）
　　２０３　…　ＣＤ／ＤＶＤ用対物レンズ（第２の対物レンズ）
　　Ａ１１　…　光軸（第１の入射軸）
　　Ａ１２　…　光軸（第１の出射軸）
　　Ａ２１　…　光軸（第２の入射軸）
　　Ａ２２　…　光軸（第２の出射軸）
　　Ｈ　…　ハウジング
　　Ｈ１１、Ｈ１２、Ｈ２１、Ｈ２２　…　設置面
　　Ｈ４　…　内壁部（側壁）
　　Ｈ４ａ　…　凹部
　　Ｒ１　…　立ち上げミラー（第１の反射部材）
　　Ｒ２　…　立ち上げミラー（第２の反射部材） 101: Semiconductor laser (first laser light source)
107 ... BD objective lens (first objective lens)
201 ... Semiconductor laser (second laser light source)
203 ... Objective lens for CD / DVD (second objective lens)
A11: Optical axis (first incident axis)
A12: Optical axis (first emission axis)
A21 ... Optical axis (second incident axis)
A22: Optical axis (second emission axis)
H ... Housing H11, H12, H21, H22 ... Installation surface H4 ... Inner wall (side wall)
H4a: Recessed portion R1: Raising mirror (first reflecting member)
R2 ... Rising mirror (second reflecting member)

Claims (8)

  1. 　第１のレーザ光を出射する第１のレーザ光源と、
    　第２のレーザ光を出射する第２のレーザ光源と、
    　前記第１のレーザ光を第１のディスクに収束させる第１の対物レンズと、
    　前記第２のレーザ光を第２のディスクに収束させ、且つ、前記第１の対物レンズよりも前記第２のディスクの内周側に配置された第２の対物レンズと、
    　第１の入射軸に沿って入射した前記第１のレーザ光を第１の出射軸に沿う方向へ反射させて前記第１の対物レンズに入射させる板状の第１の反射部材と、
    　前記第１の出射軸に垂直な平面の面内方向に前記第１の入射軸から傾く第２の入射軸に沿って入射した前記第２のレーザ光を第２の出射軸に沿う方向へ反射させて前記第２の対物レンズに入射させる板状の第２の反射部材と、を備え、
    　前記第１の反射部材は、前記第２の反射部材に隣接する端縁が前記第２の出射軸から離れる形状を有する、
    ことを特徴とする光ピックアップ装置。     A first laser light source that emits a first laser beam;
    A second laser light source that emits a second laser light;
    A first objective lens for focusing the first laser beam on a first disk;
    A second objective lens that converges the second laser light on a second disk and is disposed on an inner peripheral side of the second disk with respect to the first objective lens;
    A plate-like first reflecting member that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens;
    Reflecting the second laser light incident along a second incident axis inclined from the first incident axis in an in-plane direction of a plane perpendicular to the first outgoing axis in a direction along the second outgoing axis. And a plate-like second reflecting member that is incident on the second objective lens,
    The first reflecting member has a shape in which an edge adjacent to the second reflecting member is separated from the second emission axis.
    An optical pickup device characterized by that.
  2. 　請求項１に記載の光ピックアップ装置において、
    　前記第１の反射部材は、所定の厚みを有する直方体の前記第２の反射部材に隣接する側面が平面状にカットされた形状を有する、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to claim 1,
    The first reflecting member has a shape in which a side surface adjacent to the second reflecting member of a rectangular parallelepiped having a predetermined thickness is cut into a flat shape.
    An optical pickup device characterized by that.
  3. 　請求項２に記載の光ピックアップ装置において、
    　前記第１の反射部材は、平行四辺形の輪郭を有する、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to claim 2,
    The first reflecting member has a parallelogram outline,
    An optical pickup device characterized by that.
  4. 　請求項２または３に記載の光ピックアップ装置において、
    　前記第１の反射部材は、光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁が、前記第２の出射軸から離れるように回転した状態で、前記設置面に設置される、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to claim 2 or 3,
    The first reflecting member is installed in a state in which an edge of the first reflecting member placed on an installation surface of a housing accommodating an optical system is rotated so as to be separated from the second emission axis. Installed on the surface,
    An optical pickup device characterized by that.
  5. 　請求項１ないし４の何れか一項に記載の光ピックアップ装置において、
    　光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁の少なくとも一部が、前記第２の入射軸に沿って進む前記第２のレーザ光の光束部分と前記設置面との間の隙間に入り込むように、前記第１の反射部材が前記設置面に設置される、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to any one of claims 1 to 4,
    At least a part of the edge of the first reflecting member placed on the installation surface of the housing that houses the optical system has a light beam portion of the second laser light that travels along the second incident axis, and The first reflecting member is installed on the installation surface so as to enter the gap between the installation surface,
    An optical pickup device characterized by that.
  6. 　請求項１ないし５の何れか一項に記載の光ピックアップ装置において、
    　光学系を収容するハウジングの、前記第１および第２のディスクの内周側の境界を形成する側壁に、当該側壁が肉薄となった凹部が形成され、
    　前記第２の反射部材は、前記凹部に収容されるように前記ハウジングに設置される、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to any one of claims 1 to 5,
    On the side wall forming the boundary on the inner peripheral side of the first and second discs of the housing that houses the optical system, a concave portion with the thin side wall is formed,
    The second reflecting member is installed in the housing so as to be received in the recess.
    An optical pickup device characterized by that.
  7. 　請求項１ないし６の何れか一項に記載の光ピックアップ装置において、
    　前記第１のディスクは、ブルーレイディスクであり、
    　前記第２のディスクは、デジタルバータサイルディスクである、
    ことを特徴とする光ピックアップ装置。     The optical pickup device according to any one of claims 1 to 6,
    The first disc is a Blu-ray disc;
    The second disc is a digital bar sail disc;
    An optical pickup device characterized by that.
  8. 　第１のレーザ光を出射する第１のレーザ光源と、
    　第２のレーザ光を出射する第２のレーザ光源と、
    　前記第１のレーザ光を第１のディスクに収束させる第１の対物レンズと、
    　前記第２のレーザ光を第２のディスクに収束させ、且つ、前記第１の対物レンズよりも前記第２のディスクの内周側に配置された第２の対物レンズと、
    　第１の入射軸に沿って入射した前記第１のレーザ光を第１の出射軸に沿う方向へ反射させて前記第１の対物レンズに入射させる板状の第１の反射部材と、
    　前記第１の出射軸に垂直な平面の面内方向に前記第１の入射軸から傾く第２の入射軸に沿って入射した前記第２のレーザ光を第２の出射軸に沿う方向へ反射させて前記第２の対物レンズに入射させる板状の第２の反射部材と、を備え、
    　前記第１の反射部材は、光学系を収容するハウジングの設置面に載置される前記第１の反射部材の端縁が、前記第２の出射軸から離れるように回転した状態で、前記設置面に設置される、
    ことを特徴とする光ピックアップ装置。     A first laser light source that emits a first laser beam;
    A second laser light source that emits a second laser light;
    A first objective lens for focusing the first laser beam on a first disk;
    A second objective lens that converges the second laser light on a second disk and is disposed on an inner peripheral side of the second disk with respect to the first objective lens;
    A plate-like first reflecting member that reflects the first laser beam incident along the first incident axis in a direction along the first emission axis and enters the first objective lens;
    Reflecting the second laser beam incident along the second incident axis inclined from the first incident axis in the in-plane direction of the plane perpendicular to the first outgoing axis in the direction along the second outgoing axis. And a plate-like second reflecting member that is incident on the second objective lens,
    The first reflecting member is installed in a state in which an edge of the first reflecting member placed on an installation surface of a housing accommodating an optical system is rotated so as to be separated from the second emission axis. Installed on the surface,
    An optical pickup device characterized by that.
PCT/JP2012/080285 2011-12-01 2012-11-22 Optical pickup device WO2013080879A1 (en)

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PCT/JP2012/080285 WO2013080879A1 (en) 2011-12-01 2012-11-22 Optical pickup device

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WO (1) WO2013080879A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6329234U (en) * 1986-08-06 1988-02-26
JP2009026385A (en) * 2007-07-19 2009-02-05 Sony Corp Optical pickup device and optical disk device using the same
JP2009116966A (en) * 2007-11-07 2009-05-28 Hitachi Media Electoronics Co Ltd Optical pickup device
JP2010205377A (en) * 2009-03-06 2010-09-16 Funai Electric Co Ltd Optical pickup device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6329234U (en) * 1986-08-06 1988-02-26
JP2009026385A (en) * 2007-07-19 2009-02-05 Sony Corp Optical pickup device and optical disk device using the same
JP2009116966A (en) * 2007-11-07 2009-05-28 Hitachi Media Electoronics Co Ltd Optical pickup device
JP2010205377A (en) * 2009-03-06 2010-09-16 Funai Electric Co Ltd Optical pickup device

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