WO2013073445A1 - Structure de montage d'élément optique et dispositif de lecture optique - Google Patents

Structure de montage d'élément optique et dispositif de lecture optique Download PDF

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Publication number
WO2013073445A1
WO2013073445A1 PCT/JP2012/078973 JP2012078973W WO2013073445A1 WO 2013073445 A1 WO2013073445 A1 WO 2013073445A1 JP 2012078973 W JP2012078973 W JP 2012078973W WO 2013073445 A1 WO2013073445 A1 WO 2013073445A1
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WO
WIPO (PCT)
Prior art keywords
optical element
mounting structure
slope
pbs
wall surface
Prior art date
Application number
PCT/JP2012/078973
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English (en)
Japanese (ja)
Inventor
康文 山岸
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
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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 WO2013073445A1 publication Critical patent/WO2013073445A1/fr

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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
    • G11B7/1365—Separate or integrated refractive elements, e.g. wave plates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1372—Lenses
    • G11B7/1374—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
    • G11B7/13922—Means for controlling the beam wavefront, e.g. for correction of aberration passive
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • 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 an optical element mounting structure and an optical pickup device using the same.
  • various optical elements such as a half mirror and a polarization beam splitter are installed in an optical pickup device. These optical elements need to be accurately attached to the housing of the optical pickup device.
  • the optical element is installed such that the bottom surface is placed on the housing.
  • a method of adhering and fixing the half mirror to the housing while pressing one side surface of the half mirror against the installation surface of the housing is used (for example, Patent Document 1).
  • the present invention has been made to solve such a problem, and provides an optical element mounting structure capable of simply and appropriately mounting an optical element to an installation member, and an optical pickup device using the same. Objective.
  • a first aspect of the present invention relates to an attachment structure for attaching an optical element to an installation member.
  • the mounting structure includes an elastic member interposed between the optical element and the installation member.
  • the installation member includes two slopes that are inclined by a predetermined angle so that the outside is displaced in the same direction with respect to one horizontal plane, a first wall surface that is formed behind the slope and is perpendicular to the slope, A second wall surface formed in front of the slope and facing the first wall surface.
  • the optical element includes two lower surfaces that are respectively placed on the two inclined surfaces.
  • the elastic member is inserted between the second wall surface and the front surface of the optical element in a state where the two lower surfaces are placed on the two inclined surfaces, and the optical element is elastically generated by the elastic member. Is pressed against the first wall surface.
  • the optical element is positioned in the in-plane direction perpendicular to the front-rear direction only by placing the lower surface of the optical element on the slope. Further, the optical element is positioned in the front-rear direction by inserting an elastic member between the second wall surface and the front surface of the optical element. Therefore, the optical element can be easily and properly attached to the installation member.
  • the elastic member may be a plate-like spring that is bent so that two plate-like portions face each other at a predetermined interval. In this case, the interval between the two plate-like portions is reduced from a predetermined interval, and the two plate-like portions are inserted between the second wall surface and the front surface of the optical element.
  • one plate-like portion of the spring has a curved convex surface that comes into contact with the front surface of the optical element when the two plate-like portions are interposed between the second wall surface and the front surface of the optical element. It is desirable to be done. In this way, the spring can be smoothly pushed between the second wall surface and the front surface of the optical element.
  • an engaging portion extending in a direction away from the one plate-like portion is extended on the upper portion of the other plate-like portion of the spring, and an abutting surface that comes into contact with this engaging portion is on the upper side of the second wall portion.
  • the spring is attached to the installation member by pushing the two plate-like portions between the second wall surface and the front surface of the optical element until the locking portion comes into contact with the contact surface. If it carries out like this, a spring can be attached to an installation member only by pushing in between two plate-shaped parts between a 2nd wall surface and the front surface of an optical element.
  • gap generating portions are formed for securing a gap between both ends in the width direction of the lower surface when the lower surface of the optical element is placed on the slope. Is desirable. This prevents the burr from coming into contact with the installation member and tilting the optical element even when a burr is attached to the lower surface of the optical element when the optical element is cut out. Therefore, the positioning accuracy of the optical element can be increased.
  • the installation member when the two slopes are formed so as to face each other, the installation member has a clearance surface on the first wall surface side of the slope that is one step lower than the slope and parallel to the slope.
  • the elastic member is provided between the second wall surface and the front surface of the optical element so that an elastic force is applied to the center of gravity of the triangle whose apex is the contact position between the three wall surface portions and the back surface of the optical element. It is desirable to be inserted in. If it carries out like this, the back surface of an optical element can be equally pressed on three wall surface parts.
  • the installation member is formed with a relief portion that prevents the corner portion of the boundary between the two lower surfaces from coming into contact with the installation member when the lower surface of the optical element is placed on the slope.
  • the corner portion abuts on the installation member, and the optical element can be prevented from being inclined, and the positional accuracy of the optical element can be improved.
  • An optical pickup device includes an optical element mounting structure according to the first aspect, an optical system for irradiating a disk with laser light emitted from a laser light source, and the optical system installed therein. And a housing as an installation member. And at least 1 optical element which comprises an optical system is attached to a housing by the said attachment structure.
  • an optical element mounting structure capable of simply and appropriately mounting an optical element on an installation member, and an optical pickup device using the same.
  • the present invention is applied to an optical pickup device that irradiates a BD (Blu-ray Disc), a CD (Compact Disc), and a DVD (Digital Versatile Disc) with laser light.
  • BD Blu-ray Disc
  • CD Compact Disc
  • DVD Digital Versatile Disc
  • FIGS. 1A and 1B show an optical system of an optical pickup device 1 according to the embodiment.
  • 1A is a top view of the optical system
  • FIG. 1B is an internal perspective view of the peripheral portion of the objective lens actuator viewed from the side
  • FIG. 1C shows the arrangement of laser elements in the semiconductor laser 101.
  • an optical pickup device 1 includes a semiconductor laser 101, a diffraction grating 102, a flat polarizing beam splitter (PBS) 103, a ⁇ / 4 plate 104, a collimator lens 105, A lens actuator 106, a rising mirror 107, an objective lens 108, a diffractive optical element 109, and a photodetector 110 are provided.
  • PBS flat polarizing beam splitter
  • the semiconductor laser 101 includes a laser beam with a wavelength of about 400 nm (hereinafter referred to as “BD light”), a laser beam with a wavelength of about 650 nm (hereinafter referred to as “DVD light”), and a laser beam with a wavelength of about 780 nm (hereinafter referred to as “CD light”). Light)) in the same direction.
  • BD light laser beam with a wavelength of about 400 nm
  • DVD light laser beam with a wavelength of about 650 nm
  • CD light laser beam with a wavelength of about 780 nm
  • the semiconductor laser 101 includes laser elements 101a, 101b, and 101c that emit BD light, DVD light, and CD light, respectively, in one CAN.
  • the laser elements 101b and 101c are integrally formed so that the interval between the light emitting points is w2, and the laser element 101a has an interval between the light emitting point and the light emitting point of the laser element 101b as w1 (w1> w2). It is formed as follows.
  • the laser elements 101a, 101b, and 101c are formed so that the light emitting points are aligned on a straight line.
  • the optical system after the semiconductor laser 101 is adjusted so that its optical axis matches the optical axis of the DVD light.
  • the diffraction grating 102 splits only the BD light out of the BD light, DVD light, and CD light emitted from the semiconductor laser 101 into a main beam and two sub beams. DVD light and CD light are also diffracted by the diffraction grating 102, but the intensity of sub-beams of these lights is extremely small.
  • the PBS 103 reflects the laser light incident from the diffraction grating 102 side.
  • the PBS 103 is a thin plate-like parallel flat plate, and a polarizing film is formed on the incident surface thereof.
  • the semiconductor laser 101 is arranged so that the polarization directions of the BD light, DVD light, and CD light are S-polarized with respect to the PBS 103.
  • the ⁇ / 4 plate 104 converts the laser light reflected by the PBS 103 into circularly polarized light, and converts the reflected light from the disk into linearly polarized light that is orthogonal to the polarization direction when traveling toward the disk. As a result, the laser light reflected by the disk passes through the PBS 103 and is guided to the photodetector 110.
  • the collimator lens 105 converts the laser light reflected by the PBS 103 into parallel light.
  • the lens actuator 106 drives the ⁇ / 4 plate 104 and 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 ⁇ / 4 plate 104 and 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.
  • a gear (not shown) is disposed on the moving member 106a, and this gear meshes with the gear 106c.
  • the gear 106c is connected to the drive shaft of the motor 106d.
  • the rising mirror 107 reflects the laser beam incident through the collimator lens 105 in the direction toward the objective lens 108.
  • the objective lens 108 is held by a holder 121, and the holder 121 is driven in a focus direction and a tracking direction by an objective lens actuator 122. By driving the holder 121 in this way, the objective lens 108 is driven in the focus direction and the tracking direction.
  • the reflected light from the disc is converted by the ⁇ / 4 plate 104 into linearly polarized light that becomes P-polarized light with respect to the PBS 103.
  • the reflected light from the disk passes through the PBS 103.
  • the PBS 103 is disposed so as to be inclined by 45 degrees with respect to the optical axes of the BD light, DVD light, and CD light. For this reason, when BD light, DVD light, and CD light are transmitted through the PBS 103 in a converged state, astigmatism is introduced into these lights.
  • the diffractive optical element 109 diffracts BD light, DVD light, and CD light.
  • the diffractive optical element 109 is designed so that the + 1st order diffraction efficiency is high for BD light and the 0th order diffraction efficiency is high for DVD light and CD light.
  • the + 1st order diffracted light of the BD light is bent in a direction approaching the optical axis of the DVD light by the diffractive optical element 109 and is irradiated on the light receiving surface of the photodetector 110 at the irradiation position of the DVD light.
  • the photodetector 110 is provided with a four-divided sensor at a position where the 0th-order diffracted light of DVD light and CD light is irradiated.
  • the main beam of BD light (+ 1st order diffracted light) is diffracted by the diffractive optical element 109 as described above, and is irradiated to the quadrant sensor that receives the DVD light.
  • the photodetector 110 is provided with a four-divided sensor at a position where two sub beams (+ 1st order diffracted light) of BD light are irradiated.
  • the sensor layout of the photodetector 110 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.
  • FIG. 2 is a perspective view of the optical pickup device 1 as viewed from above.
  • FIG. 2 shows the objective lens 108, the holder 121, and the objective lens actuator 122 among the configurations shown in FIGS. 1 (a) and 1 (b).
  • Other optical systems are mounted on the back surface of the housing H.
  • FIG. 2 shows an opening H41 and a leaf spring P described later.
  • the housing H is made of PPS (polyphenylene sulfide).
  • FIG. 3 is a perspective view when the optical pickup device 1 is viewed from the back side.
  • FIG. 3 shows a semiconductor laser 101, a diffraction grating 102, a PBS 103, a ⁇ / 4 plate 104, a moving member 106a, a shaft 106b, a gear 106c, a motor 106d, A raising mirror 107 is shown.
  • a receiving portion for installing each member of the optical system is formed on the rear surface of the housing H.
  • Each member of the optical system is installed in a corresponding receiving portion directly or in a state of being accommodated in a holder.
  • FIG. 4A is a diagram showing the housing H in the vicinity of the installation position of the PBS 103.
  • FIG. 4A shows the same coordinates as those shown in FIG.
  • FIG. 4A also shows the x axis and the y axis that form an angle of 45 degrees with respect to the X axis and the Z axis in the XZ plane (horizontal plane).
  • the x axis and the y axis are perpendicular to each other.
  • a recess H1 is formed in the vicinity of the installation position of the PBS 103 in the housing H.
  • slopes H11 and H12 and wall surfaces H13 are formed on the y-axis positive direction (left rear) side, and slopes H21, H22 and wall surface H23 are formed on the y-axis negative direction (right front) side.
  • a plane H31 is formed on the x-axis negative direction (left front) side, and an opening H41 and wall surfaces H42 and H43 are formed on the center X-axis positive direction (downward) side.
  • the hollow for a laser beam to pass is formed in the back of the hollow H1, the right direction, and the left direction, and the hollow H1 is connected with these hollows.
  • the inclined surfaces H11 and H21 are inclined so that the opening H41 side is lowered from a state parallel to the XZ plane (horizontal plane).
  • slopes H12 that are one step lower than the slope H11 and parallel to the slope H11 are formed.
  • slopes H22 that are one step lower than the slope H21 and parallel to the slope H21 are formed on both sides of the slope H21.
  • wall surfaces H13 and H23 perpendicular to the x-axis direction are extended upward from the inclined surfaces H12 and H22 on the positive side of the x-axis (Y-axis positive direction).
  • the inclined surfaces H12 and H22 are connected to the opening H41, and the inclined surfaces H12 and H22 on the positive side of the x-axis are connected to the wall surface H43 perpendicular to the x-axis direction.
  • the wall surface H43 is one inner surface of the opening H41.
  • the opening H41 has a substantially rectangular outline in a top view, and the long side and the short side of the rectangle are parallel to the x-axis direction and the y-axis direction, respectively.
  • the opening H41 extends further to the x-axis negative side than the x-axis negative side edge of the slopes H12 and H22 on the x-axis negative side.
  • the surface on the negative side of the x-axis of the opening H41 is perpendicular to the x-axis and is connected to the wall surface H42 that is also perpendicular to the x-axis in the same plane.
  • the upper end of the wall surface H42 is connected to the plane H31.
  • the boundary portion between the wall surface H42 and the plane H31 is chamfered.
  • the depression H1 is configured to have a symmetrical shape with respect to a plane that passes through the center of the opening H41 and is perpendicular to the y-axis direction.
  • the slopes H11, H12, H21, and H22 are surfaces that form an angle of 45 degrees with the XZ plane (horizontal plane), and the slopes H11 and H21 are on the Y axis positive direction (upward) side of the slopes H12 and H22, respectively. It protrudes.
  • the plane H31 is a plane parallel to the horizontal plane, and the opening H41 is a hole that penetrates the housing H in the vertical direction.
  • Wall surfaces H13, H23, H42, and H43 are surfaces perpendicular to the x-axis.
  • the wall surfaces H13, H23, and H43 are positioned on the same plane. Further, the surface accuracy of the wall surfaces H13, H23, and H43 is enhanced by applying mirror finish to the regions corresponding to the wall surfaces H13, H23, and H43 of the mold forming the housing H.
  • the PBS 103 is fitted into the depression H1 from the upper side to the lower side in FIG.
  • FIG. 4B is a diagram showing the PBS 103.
  • FIG. 4 (b) coordinates similar to the coordinates shown in FIG. 4 (a) are also shown.
  • the PBS 103 has a rectangular parallelepiped shape, and has an incident surface 103a, a transmission surface 103b, upper surfaces 103c and 103d, and lower surfaces 103e and 103f on the surface.
  • the incident surface 103a and the transmission surface 103b have a square shape.
  • the PBS 103 has an upper surface 103c and a lower surface 103f that are parallel to a horizontal plane (XZ plane), and the incident surface 103a and the transmission surface 103b are perpendicular to the x axis. As shown in FIG.
  • the PBS 103 tilted as shown in FIG. 4 (b) is fitted from above into the recess H1 shown in FIG. 4 (a).
  • the lower surface 103e is in contact with the inclined surface H11
  • the lower surface 103f is in contact with the inclined surface H21
  • the corner 103g at the boundary between the lower surfaces 103e and 103f is positioned in the opening H41 so as not to contact the housing H.
  • the PBS 103 is fitted into the recess H1 so that the incident surface 103a contacts the wall surfaces H13, H23, and H43.
  • the slopes H11 and H21 are surfaces that form an angle of 45 degrees with the XZ plane (horizontal plane), and the angles formed by the slopes H11 and H21 are 90 degrees. Further, since the PBS 103 is a rectangular parallelepiped, the angle formed by the lower surfaces 103e and 103f is 90 degrees. Therefore, when the PBS 103 is inserted into the recess H1, if the lower surfaces 103e and 103f of the PBS 103 are placed on the inclined surfaces H11 and H21, both the lower surfaces 103e and 103f are brought into contact with the corresponding inclined surfaces H11 and H21 by the weight of the PBS 103, respectively. It moves to the position where it contacts, and the PBS 103 is positioned at that position. Further, even if the PBS 103 is moved in the x-axis direction in this state, the position of the PBS 103 in the in-plane direction of the plane perpendicular to the x-axis is maintained.
  • FIG. 5A is a view showing a state in which the PBS 103 shown in FIG. 4B is fitted in the recess H1 shown in FIG. 4A and the incident surface 103a is in contact with the wall surfaces H13, H23, and H43. is there. At this time, a gap is formed between the transmission surface 103b and the wall surface H42, and a later-described leaf spring P is inserted into the gap.
  • FIG. 4C is a view showing the leaf spring P.
  • coordinate axes similar to the Y-axis, x-axis, and y-axis shown in FIG. 4A are also shown.
  • the leaf spring P is made of a metal material and has an intermediate part P10, a bent part P20, a flange part P30, and a flat part P40.
  • the bent part P20 is connected to the lower end of the intermediate part P10.
  • a support surface P21 made of a curved projection is formed at the upper end of the bent portion P20.
  • the collar part P30 is connected to the upper end of the intermediate part P10 via the plane part P40.
  • the lower surface of the plane part P40 is parallel to the horizontal plane.
  • the flat surface portion P40 is connected so as to be bent approximately 90 degrees in a curved shape from the end in the Y axis positive direction of the intermediate portion P10, and further, approximately 90 in a curved shape from the end in the x axis negative direction of the intermediate portion P10.
  • the buttocks P30 are connected so as to be bent each time.
  • the bent portion P20 is connected so as to be bent at an acute angle in a curved shape from the end portion in the Y-axis negative direction of the intermediate portion P10.
  • the bent part P20 is bent in a direction away from the intermediate part P10 at a slightly higher position (first bent position) from the bottom.
  • the bent portion P20 has a width that gradually decreases in the y-axis direction as it goes in the positive direction of the Y-axis, but a portion having substantially the same width in the y-axis direction is provided at the tip.
  • the bent portion P20 is bent again in a curved shape in a direction approaching the intermediate portion P10, and the tip of the bent portion P20 is turned to the intermediate portion P10. It is close to a parallel state.
  • a support surface P21 is provided at a portion where the width of the tip of the bent portion P20 is the same.
  • the support surface P21 When the leaf spring P is viewed in the negative x-axis direction, the support surface P21 has a contour obtained by rounding all apex angles of an isosceles triangle whose base is parallel to the y-axis direction.
  • the support surface P21 becomes narrower as the width in the y-axis direction goes in the Y-axis direction.
  • the support surface P21 is disposed such that the upper portion thereof is engaged with the second bending position.
  • the support surface P21 is curved so that the center portion thereof is higher, and the highest portion of the support surface P21 is slightly below the second folding position (Y-axis negative side). Further, the corner of the bent portion P20 in the y-axis direction at the tip is chamfered into a curved surface.
  • FIG. 5B is a diagram showing a state in which the leaf spring P is inserted between the transmission surface 103b and the wall surface H42 in the state shown in FIG. 5A.
  • the intermediate portion P10 is in contact with the wall surface H42
  • the support surface P21 of the bent portion P20 is in contact with the transmission surface 103b of the PBS 103
  • the lower surface of the flat surface portion P40 is in contact with the flat surface H31 of the housing H.
  • the width of the leaf spring P in the y-axis direction is substantially the same as the width of the plane H31 and the wall surface H42 in the y-axis direction.
  • FIG. 6A is a side view showing the state of FIG. In FIG. 6A, coordinate axes similar to the Y-axis, x-axis, and y-axis shown in FIG. 5B are also shown.
  • the intermediate portion P10 contacts the wall surface H42, and the support surface P21 of the bent portion P20 contacts the transmission surface 103b.
  • the bent portion P20 is bent in the direction indicated by the dashed arrow.
  • the leaf spring P is inserted downward (Y-axis negative direction) until the lower surface of the flat portion P40 contacts the flat surface H31.
  • the PBS 103 is urged in the positive x-axis direction by the leaf spring P by the restoring force of the leaf spring P.
  • the incident surface 103a is supported in the negative x-axis direction by the wall surfaces H13, H23, and H43, and the transmissive surface 103b is pressed in the positive x-axis direction by the support surface P21.
  • an adhesive is applied to the boundary between the upper surface 103c and the inclined surface H11 and the boundary between the upper surface 103d and the inclined surface H21.
  • FIG. 6B is a diagram when the state of FIG. 6A is viewed in the negative x-axis direction.
  • the wall surfaces H13, H23, and H43 support the positions p1 to p3 on the incident surface 103a, respectively, and the support surface P21 is in contact with the position p4 on the transmission surface 103b.
  • the width in the y-axis direction of the leaf spring P is substantially the same as the width of the plane H31 and the wall surface H42, and as shown in FIG. A leaf spring P is inserted so that the lower surface of the plate abuts against the plane H31.
  • the position p4 where the support surface P21 of the leaf spring P abuts the transmission surface 103b is substantially the same position on the transmission surface 103b.
  • the position p4 is positioned at the center of gravity of a triangle having apexes at the positions p1, p2, and p3, as shown in FIG. 6B.
  • the PBS 103 is evenly pressed against the wall surfaces H13, H23, and H43. Further, the laser light incident on the PBS 103 from the diffraction grating 102 side and the ⁇ / 4 plate 104 side is irradiated on the position of the broken circle on the incident surface 103a. Therefore, even if the position p4 is set in this way, the leaf spring P is not applied to the laser beam.
  • FIG. 6C is a diagram showing a state in which the lower surface 103e of the PBS 103 is in contact with the slope H11.
  • the thickness of the PBS 103 (the width in the thickness direction of the lower surface 103e) is smaller than the width from the left end of the left slope H12 to the right end of the right slope H12.
  • the bottom surface 103e may have a burr as shown in FIG. 6C when the PBS 103 is cut out.
  • the slopes H11 and H12 are formed so that the height difference w3 between the slope H11 and the slope H12 is larger than the assumed burr height. Accordingly, when the PBS 103 is fitted into the recess H1, the burr does not hit the slope H12, and the lower surface 103e can be reliably placed on the slope H11. Therefore, the PBS 103 is prevented from being tilted by the burr, and the PBS 103 can be installed with high accuracy.
  • the slopes H21 and H22 are the same as the slopes H11 and H12.
  • the plate spring P is inserted as shown in FIGS. 5B and 6A, so that the PBS 103 is attached to the housing H. Therefore, a complicated operation of applying an adhesive while pressing the PBS 103 against the surface is not necessary, and the PBS 103 can be easily attached to the housing H.
  • the PBS 103 By simply placing the lower surfaces 103e and 103f of the PBS 103 on the inclined surfaces H11 and H21, the PBS 103 is positioned in the in-plane direction perpendicular to the x-axis direction, and the leaf spring P is pushed between the transmission surface 103b and the wall surface H42. As a result, the PBS 103 is positioned in the x-axis direction. Therefore, the PBS 103 can be easily and properly attached to the recess H1 on the installation member.
  • the leaf spring P is connected to the wall surface H42 until the plane portion P40 abuts against the plane H31.
  • the leaf spring P can be attached to the housing H simply by pushing between the transmitting surface 103b.
  • the slopes H11 and H12 are formed so that the width from the left end of the left slope H12 to the right end of the right slope H12 is larger than the thickness of the PBS 103. Even if there is variation, the PBS 103 can be properly placed on the slope H11. Further, as shown in FIG. 6C, a slope H12 that is one step lower than the slope H11 is formed, and the height difference w3 between the slope H11 and the slope H12 is larger than the expected burr height. Even when the burrs are attached to the PBS 103, the burrs abut against the housing H to prevent the PBS 103 from tilting. Therefore, the positioning accuracy of the PBS 103 can be increased.
  • the opening H41 is formed in the recess H1
  • the corner 103g of the boundary between the lower surfaces 103e and 103f does not hit the housing H by the opening H41
  • the lower surfaces 103e and 103f of the PBS 103 are moved to the inclined surfaces H11, 103f.
  • the corner 103g of the PBS 103 contacts the housing H and the PBS 103 is inclined. Therefore, the PBS 103 can be accurately attached to the housing H.
  • the wall surfaces H13 and H23 are formed so as to extend upward from the inclined surfaces H12 and H22. Therefore, when the housing H is formed by a mold, the wall surfaces H13 and H23 are molds. It will not get caught in.
  • FIG. 6 (d) is a diagram showing a formation state of the wall surfaces H51 to H53 in the comparative example.
  • the bottom surface of the PBS 130 is placed on the installation surface on the housing H.
  • lower surfaces H51a and H52a are formed on the wall surfaces H51 and H52 as shown in FIG. 6 (d). For this reason, when the mold is pulled upward from the housing H, the lower surfaces H51a and H52a may be caught by the mold and the wall surfaces H51 and H52 may be damaged.
  • the wall surfaces H13 and H23 are continuously formed from the slopes H12 and H22, the bottom surfaces are not generated on the wall surfaces H13 and H23. For this reason, the mold can be smoothly pulled out from the housing H in the upward direction. Accordingly, the wall surfaces H13 and H23 can be appropriately formed without causing defects or the like on the wall surfaces H13 and H23.
  • the leaf spring P is provided with an elastic force at the center of gravity of the triangle whose apex is the contact position between the three wall surfaces H13, H23, H43 and the incident surface 103a of the PBS 103.
  • the transmission surface 103b of the PBS 103 can be pressed evenly against the three wall surfaces H13, H23, and H43.
  • the adhesive can be omitted as appropriate, and even when the adhesive is used, the displacement of the PBS 103 due to the deterioration of the adhesive is suppressed.
  • the present invention is not limited to the PBS 103, and other optical elements (half mirror, diffraction grating 102) in the optical pickup device.
  • the diffractive optical element 109 and the like can also be applied as appropriate.
  • the incident surface 103a and the transmission surface 103b of the PBS 103 are square, but the shape is not limited to this and may be other shapes.
  • the entrance surface 103a and the transmission surface 103b of the PBS 103 may be rectangular, or may be a pentagon as shown in FIG. 7A or a shape partially including an arc as shown in FIG. 7B. There may be.
  • the angle formed by the lower surfaces 103e and 103f is 90 degrees.
  • the angle is not limited to this, and the angle formed by the lower surfaces 103e and 103f is other than 90 degrees. May be.
  • the angle ⁇ formed by the lower surfaces 103e and 103f and the angle ⁇ formed by the slopes H11 and H21 may exceed 90 degrees as shown in FIG. 7C, or less than 90 degrees as shown in FIG. 7D. It may be.
  • the slopes H11 and H21 are formed in a V shape with the outer side displaced upward, that is, so as to face each other, but in an inverted V shape with the outer side displaced downward,
  • the slopes H11 and H21 may be formed so as not to face each other.
  • the lower surface of the PBS 103 also needs to be formed to be an inverted V-shaped slope so as to be placed on the slopes H11 and H21.
  • the inclined surfaces H11 and H21 may have any shape as long as the PBS 103 is positioned in the in-plane direction of the PBS 103 by placing the PBS 103 thereon.
  • the incident surface 103a of the PBS 103 is supported by the three wall surfaces H13, H23, and H43.
  • the present invention is not limited to this, and may be supported by one wall surface.
  • the present invention is not limited to this, and the slope H11 and the slope H12 may be connected to the slope H21 and the slope H22 by a plane or a curved surface that gradually approaches the slope H12 and the slope H22 from the boundary between the slope H11 and the slope H21. .
  • the shapes on both sides of the slope H11 and the slope H21 may be shapes other than those in the above-described embodiment, and instead of the slopes H12 and H22, a plane parallel to the horizontal plane. It may be.
  • the slopes H12 and H22 are provided on the side of the wall surfaces H13 and H23 of the slopes H11 and H21 in order to easily remove the mold. It is desirable to extend the wall surfaces H13 and H23 from these slopes H12 and H22.
  • the slopes H12 and H22 may be omitted.
  • the opening H41 does not have to be formed on the housing H side, and the slopes H11 and H21 are extended until the slopes H11 and H21 intersect. good.
  • the opening H41 is formed in order to allow the corner 103g of the PBS 103 to escape, but a recess may be formed instead of the opening H41 to allow the corner 103g of the PBS 103 to escape. Further, instead of forming an opening or a recess on the housing H side, the corner 103g may be cut out so that the corner 103g of the PBS 103 does not hit the housing H.
  • Optical pick-up apparatus 103 PBS (optical element) 103a: Incident surface (rear surface) 103b ... Transmission surface (front surface) 103e, 103f ... lower surface 103g ... corner H ... housing (installation member) H11, H21 ... slope H12 ... slope (gap generation part, relief surface) H22 ... Slope (gap generating part, relief surface) H13, H23, H43 ... Wall surface (first wall surface, wall surface portion) H31 ... Flat surface (contact surface) H42 ... Wall surface (second wall surface) P ...
  • leaf spring (elastic member) P10 Intermediate part (plate-like part, other plate-like part) P20 ... Bent part (plate-like part, one plate-like part) P21 ... Support surface (convex surface) P40 ... Flat part (locking part) P41 ... Opening (relief part)

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

[Problème] Fournir une structure de montage d'élément optique permettant de monter facilement un élément optique sur un organe d'installation d'une manière appropriée, et un dispositif de lecture optique utilisant la structure de montage. [Solution] Un boîtier (H) présente deux surfaces inclinées (H11, H21), et des surfaces de parois (H13, H23, H42, H43) qui sont perpendiculaires à l'axe x. Une séparatrice PBS (103) est insérée par le haut dans un creux (H1), et un ressort à lames (P) est inséré entre une surface transparente (103b) de la séparatrice PBS (103) et la surface d'une paroi (H42). Par conséquent, les deux surfaces inférieures (103e, 103f) de la séparatrice PBS (103) sont supportées dans la direction positive de l'axe Y par les surfaces inclinées (H11, H21), la surface d'incidence (103a) de la séparatrice PBS (103) est supportée dans la direction négative de l'axe x par les surfaces des parois (H13, H23, H43), et la surface transparente (103b) de la séparatrice PBS (103) est repoussée dans la direction positive de l'axe x par le ressort à lame (P).
PCT/JP2012/078973 2011-11-16 2012-11-08 Structure de montage d'élément optique et dispositif de lecture optique WO2013073445A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011251131A JP2015026400A (ja) 2011-11-16 2011-11-16 光学素子の取付構造および光ピックアップ装置
JP2011-251131 2011-11-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05323178A (ja) * 1992-05-22 1993-12-07 Sony Corp 平行平板型光学部品の支持構造
JPH10199005A (ja) * 1996-12-26 1998-07-31 Sony Corp 光学ピックアップ装置
JP2002197718A (ja) * 2000-12-27 2002-07-12 Olympus Optical Co Ltd 光ピックアップ
JP2009266264A (ja) * 2008-04-22 2009-11-12 Audio Technica Corp 光ピックアップ
JP2011146080A (ja) * 2010-01-12 2011-07-28 Sanyo Electric Co Ltd ハーフミラー固定装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05323178A (ja) * 1992-05-22 1993-12-07 Sony Corp 平行平板型光学部品の支持構造
JPH10199005A (ja) * 1996-12-26 1998-07-31 Sony Corp 光学ピックアップ装置
JP2002197718A (ja) * 2000-12-27 2002-07-12 Olympus Optical Co Ltd 光ピックアップ
JP2009266264A (ja) * 2008-04-22 2009-11-12 Audio Technica Corp 光ピックアップ
JP2011146080A (ja) * 2010-01-12 2011-07-28 Sanyo Electric Co Ltd ハーフミラー固定装置

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