JP4929071B2 - Optical element feeding device, optical pickup device, and optical disk device including the same - Google Patents

Optical element feeding device, optical pickup device, and optical disk device including the same Download PDF

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Publication number
JP4929071B2
JP4929071B2 JP2007162825A JP2007162825A JP4929071B2 JP 4929071 B2 JP4929071 B2 JP 4929071B2 JP 2007162825 A JP2007162825 A JP 2007162825A JP 2007162825 A JP2007162825 A JP 2007162825A JP 4929071 B2 JP4929071 B2 JP 4929071B2
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optical
drive shaft
movable
lens
feeding
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JP2009004013A (en
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保夫 北田
栄治 大久保
義郎 小西
正治 小野
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株式会社日立メディアエレクトロニクス
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Description

  The present invention relates to an optical pickup device used in an optical disk device, and more particularly to a microfeed device for an optical element such as a movable lens for correcting spherical aberration.
  In order to improve the recording density of the optical disk apparatus, it is effective to shorten the wavelength of the light source and increase the numerical aperture of the objective lens. One of the high-density optical disks using a blue-violet laser having a laser wavelength of about 400 nm. In addition, there is a Blu-ray Disc (hereinafter referred to as BD) using a high NA objective lens having a numerical aperture (NA) of 0.85 and an optical disc having a recording layer protective film thickness of 0.1 mm.
  In this BD, since the first recording layer and the second recording layer are arranged at a predetermined interval in the thickness direction of the disc in one optical disc, the recording layer from one recording layer to the other recording layer When switching to, spherical aberration occurs. In order to correct this spherical aberration, a movable lens is provided in front of the objective lens of the optical pickup device, and the spherical aberration is corrected by finely adjusting the position of the movable lens in the optical axis direction with a lens feeding device.
Conventionally, the driving of the lens feeding device is described in, for example, Japanese Patent Application Laid-Open No. 2004-56951.
JP 2004-56951 A
  However, in the above-described conventional technology, no particular consideration is given to minute movement in the in-plane direction of the lens when moving the lens position. When the lens is driven, a displacement occurs in the in-plane direction of the lens, and when the displacement is large, a tracking error occurs. Further, when the displacement is minute, it can be absorbed by the characteristics of the actuator to which the objective lens is attached. The characteristics of the actuator of the objective lens can suppress a larger fluctuation amount as the frequency is lower. Therefore, it is important to reduce the lens displacement amount of the aberration correction apparatus and to reduce the lens fluctuation frequency.
  An object of the present invention is to provide an optical element feeding device, an optical pickup device, and an optical disk device including the same, which can suppress vibration during driving and have high reliability.
In order to achieve the above object, the first means of the present invention is an optical element feeding apparatus for moving an optical element such as a lens along the optical axis direction, for example,
A movable member for fixing and holding the optical element;
A drive shaft that supports the movable member and guides the movement in the optical axis direction;
A piezoelectric element that is joined to one end of the drive shaft to slightly displace the drive shaft in the axial direction of the drive shaft;
A crimping member for crimping a part of the movable member to a part of the outer peripheral portion of the drive shaft;
A crimping spring member that applies a crimping force to the crimping member to such an extent that the movable member can slide on the driving shaft via the drive shaft by driving the piezoelectric element;
A base member that holds the drive shaft so as to be minutely displaceable, and a groove extending in the axial direction of the drive shaft is formed on a surface of the movable member facing the drive shaft,
The groove is provided in a direction in which the crimping force of the crimping spring member is applied via a crimping member,
A part of the groove is in contact with the outer peripheral portion of the drive shaft, and a relief portion that does not contact with the outer peripheral portion of the drive shaft is provided in an intermediate portion in the longitudinal direction of the groove,
In addition, the end of the drive shaft on the side to be joined to the piezoelectric element is supported by the base member, and the opposite end not to be joined to the piezoelectric element has a cantilever structure that is a free end. It is what.
The second means of the present invention is characterized in that, in the first means, a retaining portion for preventing the movable member from coming off from the free end of the drive shaft is provided.
According to a third means of the present invention, in the first or second means, the piezoelectric element is provided with a weight and a driving spring member that elastically biases the weight in a vibration direction of the piezoelectric element. It is characterized by.
According to a fourth means of the present invention, in any one of the first to third means, the optical element is a movable lens, and a plurality of movable lenses compatible with different types of optical disks are arranged in parallel with the movable member. It is characterized by being fixedly held.
The fifth means of the present invention comprises a light source that emits light,
An objective lens for focusing the light emitted from the light source at a predetermined position of the optical disc;
A movable lens for spherical aberration correction provided on the light source side from the objective lens;
In an optical pickup device comprising an optical element feeding device for moving the movable lens along its optical axis direction,
The optical element feeding device is an optical element feeding device of the first to fourth means.
A sixth means of the present invention includes a circuit processing unit having a system controller,
A driver circuit that outputs a drive signal in response to a command signal from the system controller;
A drive unit that rotates the motor by a motor drive signal from the driver circuit;
An optical pickup device that emits light for recording / reproducing information according to an optical pickup driving signal from the driver circuit;
In an optical disc apparatus comprising an optical disc driven to rotate by a motor of the drive unit,
The optical pickup device is the optical pickup device of the fifth means.
According to a seventh means of the present invention, in the sixth means, the first recording layer and the second recording layer are arranged in the thickness direction of the optical disc in one optical disc, such as a BD. The optical disc is arranged at a predetermined interval and generates spherical aberration when switching from one recording layer to the other recording layer.
  The present invention is configured as described above, and can suppress vibration during driving, and can provide a highly reliable optical element feeding device, an optical pickup device, and an optical disk device including the same.
  Next, a first embodiment of the present invention will be described with reference to FIGS. In this embodiment, a lens feeding device used for spherical aberration correction provided in an optical pickup device that requires high feeding accuracy will be described.
  FIG. 1 is a schematic diagram illustrating an arrangement example of various optical elements in the optical pickup device. Laser light emitted from the laser diode 1 enters the collimator lens 2, passes through the diffraction grating 3, enters the deflecting beam splitter 4, enters the fixed lens 6 through the movable lens 5, and changes its direction by 90 degrees with the mirror 7. The focal point is formed at a predetermined position on the optical disk 9 through the objective lens 8.
  When the thickness of the cover glass (substrate) of the optical disk 9 changes as in the case of the BD, spherical aberration occurs, so that the light that enters the objective lens 8 is weakly divergent light or weakly convergent light so as to cancel it. Need to be adjusted.
  In the present embodiment, the spherical aberration is corrected by moving the movable lens 5. In the BD, when the thickness change of the cover glass of the optical disk 9 changes by 1 μm, the spherical aberration changes by about 10 mλ. Here, mλ is a unit of aberration, and λ is the wavelength of light to be used. Since the distance between the first recording layer and the second recording layer in the optical disc 9 is 25 μm, the spherical aberration is 250 mλ. In the present embodiment, a case will be described where a lens capable of correcting spherical aberration of 10 mλ is used when the movable lens 5 is moved by 20 μm.
  In order to correct the spherical aberration more accurately, it is necessary to reduce the feed amount of the movable lens 5.
  FIG. 2 is a perspective view showing a lens feeding device that moves the movable lens 5. As shown in the figure, the movable lens 5 is fixedly held on the distal end side of the movable member 10 made of a synthetic resin molded body having wear resistance and a small friction coefficient. A frame body portion 11 that is hollow toward the optical axis direction of the movable lens 5 is integrally provided at an intermediate position of the movable member 10, and a base end of the frame body portion 11 opposite to the movable lens 5 is provided. On the part side, a fitting portion 12 having a substantially U-shaped side surface is integrally formed.
  The drive shaft 13 is inserted inside the frame body portion 11 so as to penetrate therethrough, and the fitting portion 12 is slidably fitted to the outer peripheral portion of the auxiliary shaft 14. The drive shaft 13 and the auxiliary shaft 14 are installed in parallel, and the movable member 10 (movable lens 5) is guided by the drive shaft 13 and the auxiliary shaft 14 in the optical axis direction of the movable lens 5.
  In addition to the drive shaft 13, a crimping member 15 that is crimped to the drive shaft 13 and a crimping spring member 16 that is interposed between the crimping member 15 and the side wall of the frame body 11 are provided inside the frame body 11. Is pressed and the crimping member 15 is crimped to the drive shaft 13 by the spring force of the crimping spring member 16, and as a result, the frame body portion 11 is pressed with an appropriate pressure that can slide on the drive shaft 13. Has been.
  On the base member 17, a pair of drive shaft support walls 18a, 18b and a pair of sub shaft support walls 19a, 19b are provided so as to face each other at a predetermined interval. Both end portions of the drive shaft 13 are supported by guide holes 20a and 20b formed in the drive shaft support walls 18a and 18b so as to be slidable in the axial direction with a slight clearance. On the other hand, both ends of the countershaft 14 are fixed to the countershaft support walls 19a and 19b.
  A laminated piezoelectric element 21 is bonded and fixed to one end face of the drive shaft 13, and the laminated piezoelectric element 21 is connected to a base member 17 via a weight 22 made of a metal having a large specific gravity such as tungsten and a driving spring member 23 made of a leaf spring. It is fixed to. The movable member 10 (movable lens 5) is driven in the order of nm along the axial direction of the drive shaft 13 by driving the laminated piezoelectric element 21 at different speeds V1 and V2 when contracted (V1 ≠ V2). It is the structure which carries out a minute displacement (minute movement) by. The weight 22 and the driving spring member 23 are used to effectively move the movable member 10 (movable lens 5) by the laminated piezoelectric element 21, and the driving spring member 23 includes the weight 22. The laminated piezoelectric element 21 is elastically biased in the vibration direction.
  The fluctuation that causes a problem when the movable lens 5 moves is, for example, a fluctuation component in the direction of the arrow T (in-plane direction) shown in FIG. This variation in the T direction must be suppressed to a value smaller than 1 μm.
  If the movable member 10 does not slide along the drive shaft 13, fluctuations in the lens surface direction occur. The waviness of the contact surface of the movable member 10 in contact with the drive shaft 13 is also about 1 μm. In the present invention, in order to eliminate this influence, by providing a concave portion (escape portion) in the contact portion between the movable member 10 and the drive shaft 13, contact can be made near both ends, and the contact can be made in a more stable state. it can.
  As described above, the drive shaft 13 is elastically sandwiched between the movable member 10 and the crimping member 15. The movable member 10 and the crimping member 15 are in contact with the drive shaft 13 in the shape of a Gothic arch groove, and ideally they are in contact with four lines. However, even in the Gothic arch shape, the contact portion does not necessarily become a straight line, but comes into contact with the curved portion, so that the movable member 10 swings like a seesaw with respect to the drive shaft 13, but is movable by making the central portion concave. The movement operation of the member 10 is stabilized.
  FIG. 5 is an enlarged cross-sectional view along the lines 3a-a and cc in FIG. 3, and the cross-sectional structures at both locations are the same. FIG. 6 is an enlarged cross-sectional view taken along line 3b-b.
  As shown in these drawings, a V-shaped groove 24 is formed on the inner surface of the frame body portion 11 facing the drive shaft 13, and a V-shaped groove 25 is formed on the inner surface of the crimping member 15 facing the drive shaft 13. A part of the outer periphery of the drive shaft 13 is inserted into the V-shaped grooves 24 and 25, respectively, and is in partial contact. In this embodiment, the opening angle of the V-shaped grooves 24 and 25 is set to 90 degrees.
  As shown in FIG. 5, in the frame 11 of the movable member 10, the vicinity of both ends of the drive shaft 13 (near the line aa and the line cc in FIG. 3) In contact with the Gothic arch groove shape, four locations of A, B, C and D shown in the figure are in contact.
  On the other hand, a hole-like relief portion 26 penetrating from the outside toward the inside is formed at the intermediate portion of the frame body portion 11 facing the vicinity of the intermediate portion of the drive shaft 13 (near the line b-b in FIG. 3). The intermediate portion of the frame body portion 11 is not in contact with the drive shaft 13 due to the formation of the escape portion 26.
  With such a structure, even if the shape of the groove 24 varies, the portions near the both ends of the frame 11 always come into contact with the drive shaft 13, so that the movable member 10 is connected to the drive shaft. The movement of the seesaw with respect to 13 is suppressed.
  FIG. 7 is a perspective view of a lens feeding device according to the second embodiment of the present invention. In this embodiment, the difference from the first embodiment is that in the first embodiment, both ends of the drive shaft 13 are supported by drive shaft support walls 18a and 18b (both-end support structure). In the present embodiment, the end of the drive shaft 13 on the laminated piezoelectric element 21 side is supported by a drive shaft support wall 18 a (cantilever structure), and the movable member 10 is disposed on the free end side of the drive shaft 13. This is the point that a retaining portion 27 is provided.
  Thus, by making the drive shaft 13 a cantilever structure, the frequency at which the drive shaft 13 sways can be lowered, whereby the movable member 10 (movable lens 5) that slides in a state of being pressed against the drive shaft 13. The frequency of shaking can be kept low.
  In the embodiment shown in FIG. 7, the pin-shaped retaining portion 27 is provided, but the retaining portion 27 may have another shape such as a block shape, or the base member 17 may be cut and raised to form the retaining portion 27. You can also.
  In the embodiment shown in FIG. 7, one drive shaft support wall 18a is provided. However, two or more drive shaft support walls 18a can be arranged in parallel with a gap.
  FIG. 8 shows the result of measuring the variation frequency in the T direction (in-plane direction) in the lens feeding device X (solid line) shown in FIG. 2 and the lens feeding device Y (dotted line) shown in FIG. FIG.
  As is clear from this figure, the lens feed device X (solid line) shown in FIG. 2 has a variation frequency of 2 kHz and an amplitude of 0.45 μmp-p, whereas the cantilever structure shown in FIG. In the lens feeding device Y (dotted line), the fluctuation frequency is 1 kHz and the amplitude is 0.7 μmp-p, and the cantilever structure can keep the fluctuation frequency lower.
  FIG. 9 is a perspective view of a lens feeding device according to the third embodiment of the present invention. This embodiment is different from the first embodiment in that the first movable lens 5 a and the second movable lens 5 b are held in parallel on the movable member 10.
  In recent years, HD DVD (hereinafter referred to as HD) as a next-generation DVD and BD have different substrate thicknesses of optical disks, and different numerical apertures of objective lenses. In such a situation, in order to support not only HD and BD but also standards such as CD or DVD, a plurality of movable lenses for correcting spherical aberration are required.
  This embodiment corresponds to this. For example, a first movable lens 5a for correcting spherical aberration corresponding to BD and a second movable lens 5b for correcting spherical aberration corresponding to HD are arranged in parallel with the movable member 10. Is fixedly held.
  In the present embodiment, the case where two types of optical disks of BD and HD are supported has been described, but it is also possible to correspond to four types of optical disks of CD, DVD, BD, and HD.
  FIG. 10 is a schematic diagram of an optical system of an optical pickup device that can handle the four types of optical disks of CD, DVD, BD, and HD. FIG. 11 is a schematic diagram of the optical system when the optical pickup device of FIG.
  First, the CD system will be described. CD light 62 emitted from the CD laser 61 passes through the half-wave plate 63, the lens 64, and the diffraction grating 65 and is reflected by the deflection beam splitter 66. Then, the CD light 62 passes through the lens 67, is reflected by the composite upright prism 68, passes through the lens 69 and the quarter wavelength plate 70, and enters the HD / DVD / CD compatible objective lens 71. Then, the CD light 62 emitted from the HD / DVD / CD compatible objective lens 71 is condensed on the CD disk 72.
  The CD light 62 reflected by the CD disk 72 sequentially passes through the HD / DVD / CD compatible objective lens 71, the quarter wavelength plate 70, and the lens 69, and is reflected by the composite upright prism 68. Then, the light passes through the lens 67, the deflection beam splitter 66, and the wavelength selective half-wave plate 73, is reflected by the deflection beam splitter 74, passes through the lens 75, and enters the photodetector 76.
  Next, the DVD system will be described. The DVD light 78 emitted from the DVD laser 77 passes through the half-wave plate 79 and the diffraction grating 80 and is reflected by the deflection beam splitter 81. Then, the DVD light 78 passes through the deflection beam splitter 74 and the wavelength selective half-wave plate 73, is reflected by the composite upright prism 68, and then passes through the lens 69 and the quarter-wave plate 70, and the HD / The light enters the DVD / CD compatible objective lens 71. Then, the DVD light 78 emitted from the HD / DVD / CD compatible objective lens 71 is condensed on the DVD disk 82.
  The DVD light 78 reflected by the DVD disk 82 passes through the HD / DVD / CD compatible objective lens 71, the quarter wavelength plate 70, and the lens 69, and is reflected by the composite upright prism 68. Then, the light passes through the lens 67, the deflecting beam splitter 66, the wavelength selective half-wave plate 73, the deflecting beam splitter 74, the deflecting beam splitter 81, and the lens 83 and enters the photodetector 84.
  Next, the HD / BD system will be described. The HD / BD light 86 emitted from the HD / BD laser 85 passes through a beam shaping element 87 and a variable deflection switching element 88 with a diffraction grating, and is divided into an HD light 90 and a BD light 91 by the deflection beam splitter 89 according to the direction of polarization. Is done. In the present embodiment, the light beam emitted from one laser light source (HD / BD laser 85) is switched to two optical paths by the optical path switching means 92. The optical path switching means 92 includes a variable deflection switching element 88, a deflection beam splitter 89, and a triangular prism 93.
  The HD light 90 transmitted through the deflecting beam splitter 89 is reflected by the triangular prism 93, transmitted through the movable lens 5b, reflected by the composite upright prism 68, transmitted through the lens 69 and the quarter wavelength plate 70, The light enters the HD / DVD / CD compatible objective lens 71. The HD light 90 exiting the HD / DVD / CD compatible objective lens 71 is condensed on the HD disk 94.
  The HD light 90 reflected by the HD disk 94 passes through the HD / DVD / CD compatible objective lens 71, the quarter wavelength plate 70, and the lens 69, and is reflected by the composite upright prism 68. Then, the light passes through the movable lens 5 b, is reflected by the triangular prism 93, is reflected by the deflecting beam splitter 89, passes through the lens 95, and enters the photodetector 96.
  On the other hand, the BD light 91 reflected by the deflecting beam splitter 89 passes through the movable lens 5a, is reflected by the mirror 97, passes through the quarter-wave plate 98 and the BD objective lens 99, and passes through the BD disc 100. Focused on top.
  The BD light 91 reflected by the BD disc 100 passes through the BD objective lens 99 and the quarter-wave plate 98, is reflected by the mirror 97, and passes through the movable lens 5a, the deflection beam splitter 89, and the lens 95 to detect light. It enters the device 96.
  FIG. 12 is a block diagram of the entire optical disc apparatus using the optical pickup device according to the embodiment of the present invention. As shown in the figure, the optical disk device 51 is driven and controlled by a circuit processing unit 52 having a front-end processor and a system controller, an optical pickup device 53, a driver circuit 54 controlled by the system controller, and the driver circuit 54. A drive unit 55 having a spindle motor and a sled motor and an optical disk 56 such as a BD are provided, and are connected to an external host computer 57.
  The command signal from the system controller is input to the driver circuit 54, and based on this, a motor drive signal is output from the driver circuit 54 to the drive unit 55, and the optical disk 56 is rotated.
  In addition, an optical pickup driving signal is output from the driver circuit 54 to the optical pickup device 53 based on a command signal from the system controller, thereby recording / reproducing information on the optical disk 56.
  In the above embodiment, the feeding device in the case where a lens is used as the optical element has been described. However, the present invention is not limited to this, and the present invention is also applied to a feeding device for an optical element other than a lens such as a mirror. It is possible.
It is the schematic which shows the example of arrangement | positioning of the various optical elements in the optical pick-up apparatus which concerns on embodiment of this invention. 1 is a perspective view of a lens feeding device according to a first embodiment of the present invention. It is the perspective view which looked at the lens feeding device from other directions. It is the perspective view which excised a part of the lens feeder. It is an expanded sectional view on the aa line and cc line of FIG. It is an expanded sectional view on the bb line of FIG. It is a perspective view of the lens feeder which concerns on 2nd Embodiment of this invention. It is a frequency characteristic figure which shows the result of having measured the fluctuation frequency of the in-plane direction in the lens feeder which concerns on 1st and 2nd embodiment of this invention. It is a perspective view of the lens feeder which concerns on 3rd Embodiment of this invention. 1 is a schematic diagram of an optical system of an optical pickup device that can handle four types of optical disks of CD, DVD, BD, and HD according to an embodiment of the present invention. It is the optical system schematic diagram which looked at the optical pick-up apparatus of FIG. 10 from the paper surface left side. 1 is a block diagram of an optical disc device including an optical pickup device according to an embodiment of the present invention.
Explanation of symbols
  1: laser diode, 2: collimator lens, 3: diffraction grating, 4: deflection beam splitter, 5: movable lens, 5a: first movable lens, 5b: second movable lens, 6: fixed lens, 7: mirror , 8: objective lens, 9: optical disk, 10: movable member, 11: frame body part, 12: fitting part, 13: drive shaft, 14: countershaft, 15: crimping member, 16: spring member for crimping, 17 : Base member, 18a, 18b: drive shaft support wall, 19a, 19b: auxiliary shaft support wall, 20a, 20b: guide hole, 21: laminated piezoelectric element, 22: weight, 23: spring member for drive, 24, 25: V-shaped groove, 26: escape portion, 27: retaining portion, 51: optical disc device, 52: circuit processing portion, 53: optical pickup device, 54: driver circuit, 55: drive portion, 56: optical disc, 57: host Computer.

Claims (7)

  1. An optical element feeding device for moving an optical element along its optical axis direction,
    A movable member for fixing and holding the optical element;
    A drive shaft that supports the movable member and guides the movement in the optical axis direction;
    A piezoelectric element that is joined to one end of the drive shaft to slightly displace the drive shaft in the axial direction of the drive shaft;
    A crimping member for crimping a part of the movable member to a part of the outer peripheral portion of the drive shaft;
    A crimping spring member that applies a crimping force to the crimping member to such an extent that the movable member can slide on the driving shaft via the drive shaft by driving the piezoelectric element;
    A base member that holds the drive shaft so as to be minutely displaceable, and a groove extending in the axial direction of the drive shaft is formed on a surface of the movable member facing the drive shaft,
    The groove is provided in a direction in which the crimping force of the crimping spring member is applied via a crimping member,
    A part of the groove is in contact with the outer peripheral portion of the drive shaft, and a relief portion that does not contact the outer peripheral portion of the drive shaft is provided in the middle portion in the longitudinal direction of the groove,
    In addition, the end of the drive shaft on the side to be joined to the piezoelectric element is supported by the base member, and the opposite end not to be joined to the piezoelectric element has a cantilever structure that is a free end. An optical element feeding device.
  2. 2. The optical element feeding device according to claim 1, further comprising a retaining portion for preventing the movable member from coming off from a free end of the drive shaft .
  3. 3. The optical element feeding device according to claim 1 , wherein the piezoelectric element is provided with a weight and a driving spring member that elastically biases the weight in a vibration direction of the piezoelectric element. Optical element feeder.
  4. 4. The optical element feeding device according to claim 1, wherein the optical element is a movable lens, and a plurality of movable lenses compatible with different types of optical disks are fixedly held in parallel with the movable member. An optical element feeder characterized by being made .
  5. A light source that emits light;
    An objective lens for focusing the light emitted from the light source at a predetermined position of the optical disc;
    A movable lens for spherical aberration correction provided on the light source side from the objective lens;
    In an optical pickup device comprising an optical element feeding device for moving the movable lens along its optical axis direction,
    An optical pickup device, wherein the optical element feeding device is the optical element feeding device according to any one of claims 1 to 4 .
  6. A circuit processing unit having a system controller;
    A driver circuit that outputs a drive signal in response to a command signal from the system controller;
    A drive unit that rotates the motor by a motor drive signal from the driver circuit;
    An optical pickup device that emits light for recording / reproducing information according to an optical pickup driving signal from the driver circuit;
    In an optical disc apparatus comprising an optical disc driven to rotate by a motor of the drive unit,
    6. An optical disc apparatus, wherein the optical pickup apparatus is the optical pickup apparatus according to claim 5 .
  7. 7. The optical disc device according to claim 6, wherein the optical disc includes a first recording layer and a second recording layer arranged in a thickness direction of the disc in a single optical disc at a predetermined interval. An optical disc apparatus characterized by being an optical disc in which spherical aberration occurs when switching from one recording layer to the other recording layer .
JP2007162825A 2007-06-20 2007-06-20 Optical element feeding device, optical pickup device, and optical disk device including the same Expired - Fee Related JP4929071B2 (en)

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