JP2005346771A - Optical pickup device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device in which the size of the optical pickup device section is not increased while providing a tilt correction mechanism for the warpage of an optical disk recording medium and a high density/large capacity optical information disk device is facilitated. <P>SOLUTION: An optical pickup device 20 is provided with a movable section 2 having an objective lens 1, at least a pair of elastic supporting members 6 which support the movable section 2 by one end tips, a supporting section 13 which supports the other end tips of the elastic supporting members 6 and a tilt correcting means that drives the movable section 2 to the direction in which tilt of the objective lens 1 with respect to an optical disk recording medium is corrected. The tilt correcting means comprises a tilt correction coil 10 which is arranged on the movable section 2 between the objective lens 1 and the supporting section 13 and a tilt correction magnet 9 which is arranged on the portion sandwiched between the supporting section 13 and the elastic supporting members 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup device that reads and writes information from and on an optical disk recording medium. In particular, the present invention relates to an optical pickup device for an optical information disk device having a high density / large capacity using an objective lens having a numerical aperture (NA) = 0.6 or more and a wave laser beam having a wavelength of λ = 660 nm or less.

  As a conventionally known optical pickup device, for example, those shown in FIGS. 5 to 7 are known. 5 is a top view of a conventionally known optical pickup device, FIG. 6 is a side view of the optical pickup device, and FIG. 7 is a cross-sectional view taken along line a-a ′ of FIG.

  In the conventionally known optical pickup device 21, the movable portion 2 that holds the objective lens 1 is moved in the optical axis direction (hereinafter referred to as the focus direction) of the light beam emitted from the objective lens 1 by four substantially parallel elastic support members 6. And cantilevered so that the posture of the objective lens 1 does not change even if it is driven in the radial direction of the disc (hereinafter referred to as the tracking direction) of an optical disc recording medium (not shown).

  At this time, the elastic support member 6 that cantilever-supports the movable portion 2 is usually composed of a metal wire, a leaf spring material, or the like, and is used for driving in the focus direction and for driving in the tracking direction (hereinafter referred to as “coils”). , Each of which also serves as a conductive member to a focusing coil and a tracking coil).

  A pair of magnets 3a and 3b are arranged on the base member 8 that supports the entire objective lens actuator portion so as to constitute a magnetic circuit with a polarity that attracts each other. On the other hand, a focusing coil 5 is disposed on the movable part 2 side so as to cross the magnetic field of the magnetic circuit, and a tracking coil 4 is disposed on the side of the focusing coil 5. At this time, if each coil is energized, the objective lens 1 is driven in the two directions orthogonal to the focus direction and the tracking direction while maintaining the posture of the objective lens 1.

  However, in recent optical information disk apparatuses, recording data has been increased in density. In order to cope with such higher recording data density, an objective lens having a larger numerical aperture (NA) has been used in an optical information disk device.

  However, coma is proportional to the third power of the numerical aperture of the objective lens, and astigmatism is proportional to the second power of the numerical aperture of the objective lens. When the optical axis of the light beam emitted from the lens and the disk surface of the optical disk recording medium are tilted from the vertical, the convergent light spot tends to cause coma and astigmatism. In other words, the greater the numerical aperture of the objective lens, the less margin for the tilt.

  Therefore, it is indispensable to correct the light emitted from the objective lens so as to be perpendicular to the disk surface of the optical disk recording medium (hereinafter referred to as tilt correction) even for the bowl-shaped warp deformation of the optical disk recording medium. It has become.

Thus, an optical pickup device capable of performing such tilt correction has been developed (see, for example, Patent Documents 1, 2, and 3).
Japanese Patent Laid-Open No. 10-320804 (Publication date: December 4, 1998) JP 2004-5910 A (publication date: January 8, 2004) JP 2000-149292 A (publication date: May 30, 2000)

  The optical pickup device disclosed in Patent Document 1 has an actuator structure for tilt correction, but performs tilt correction by mounting a tilt correction magnet on a movable part.

  However, since the magnet is mounted on the movable part, an increase in the weight of the movable part becomes a problem, and it becomes difficult to balance the movable part. In addition, when a magnet is mounted on the movable part, it is easily affected by surrounding magnetic metal, and there is a restriction that a non-magnetic material must be used around to avoid the influence.

  On the other hand, recent optical information disk devices have been required to drive an objective lens with high speed and high sensitivity since reading and writing of information has been speeded up. Therefore, in order to cope with this, the movable part is required to be as light as possible and have a resonance frequency as high as possible, that is, as simple as possible and as rigid as possible.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a tilt correction mechanism for warping of an optical disk recording medium and to increase the density / density without increasing the size of the optical pickup device. An object of the present invention is to provide an optical pickup device capable of supporting a large-capacity optical information disk device, and an electric / electronic device equipped with the optical pickup device.

  In order to solve the above problems, an optical pickup device according to the present invention includes at least a movable part having an objective lens, at least a pair of elastic support members that support the movable part at one end thereof, and other than the elastic support members. An optical pickup apparatus comprising: a support unit that supports an end; and a tilt correction unit that drives the movable unit in a direction for correcting the tilt of the objective lens with respect to the optical disc recording medium. It is characterized by comprising a tilt correction coil provided in a movable part between the support part and a tilt correction magnet provided in a portion sandwiched between elastic support members of the support part.

  According to the above configuration, when the tilt correction coil is energized, the tilt correction coil is driven against the magnetic field in the magnetic field of the tilt correction magnet, thereby performing tilt correction in the warp direction of the optical disc. be able to.

  Furthermore, since the tilt correction magnet that is heavier than the tilt correction coil is present in the support portion instead of the movable portion, and the tilt correction coil is present at a position closer to the fulcrum of the movable portion, The weight of the movable part, particularly the tip of the movable part, which is the point of action, becomes lighter, and even when the same driving force is applied, the objective lens can be driven at high speed and with high sensitivity. In addition, since it is difficult to be influenced by the surrounding magnetic metal, it can be said that the restriction that a non-magnetic material must be used in the surrounding area hardly occurs.

  In order to solve the above problems, the optical pickup device according to the present invention further includes, in addition to the above configuration, a focusing coil that is a focusing unit that drives the movable part in the focus direction, and the movable part in the tracking direction. A tracking coil, which is a tracking means for driving, is provided in the movable part, and a magnet, which is the focus means and the tracking means, is provided in the support part or a base member to which the support part is fixed. It is characterized by that.

  According to the said structure, the magnet which is a heavy article exists in a support part instead of a movable part. Therefore, the weight of the movable part, in particular, the distal end of the movable part, which is the action point, is further reduced, and the objective lens can be driven at a higher speed and with higher sensitivity. In addition, since it is difficult to be influenced by the surrounding magnetic metal, it can be said that the restriction that a non-magnetic material must be used in the surrounding area hardly occurs.

  In order to solve the above problems, an optical pickup device according to the present invention is characterized by further comprising a yoke connected to the tilt correction magnet in addition to the above-described configuration.

  According to the above configuration, the magnetic flux from the tilt correction magnet can be collected in the tilt correction coil, and a closed circuit of the magnetic field is formed compared to the case without the yoke, and the sensitivity of tilt correction can be increased. . Therefore, the tilt correction coil mounted on the movable portion can be made smaller, and the increase in the weight of the movable portion can be minimized.

  In order to solve the above problems, the optical pickup device according to the present invention includes a magnetic circuit in which the tilt correction magnet and the yoke are connected, and the tilt correction coil arranged in the track direction. The S and N poles of the tilt correction magnet are arranged in a direction perpendicular to the track direction on a plane substantially parallel to the disk surface of the optical disk recording medium, and the tilt correction coil is connected to the objective lens. It is characterized by being wound around an axis parallel to the optical axis of the light beam emitted through the.

  According to the above configuration, the tilt correction coil and the tilt correction magnet even when the movable portion is movable in the focus direction and the track direction and is offset from the reference position (the initial position where the movable portion is not movable). Since a sufficient size is secured, tilt correction can be performed. In addition, since there is no tilt correction magnet installed on the movable part, it reacts with surrounding metal and prevents an unintentional force from being applied to the elastic support member supporting the movable part. It becomes possible to prevent a force in the buckling direction from acting on the elastic support member that supports the movable portion.

  In order to solve the above problems, the optical pickup device according to the present invention is configured such that the tilt correction magnet includes at least two magnets having opposite directions of the magnetic field, and the direction of the magnetic field from the magnet is the track direction. It is characterized by being juxtaposed so as to be substantially parallel to each other.

  According to the said structure, the magnetic field of a different direction can be generated on the fixing | fixed part side. At this time, if the coil for tilt correction provided on the movable part side is energized, the magnetic field formed by the magnet acts to generate a rotational moment and perform tilt correction.

  In order to solve the above problems, the optical pickup device according to the present invention uses, as the tilt correction magnet, a multipolar magnet formed by integrally forming at least two magnets having opposite magnetic field directions. It is a feature.

  According to the said structure, the magnetic field of a different direction can be generated on the fixed part side using a single magnet. Therefore, it is possible to prevent an increase in the number of parts of the magnet accompanying an increase in the direction of the magnetic field. Furthermore, since it is a single magnet, the positional relationship between different magnetic fields can be accurately controlled, and the sensitivity of tilt correction can be further improved.

  The optical pickup device according to the present invention is characterized in that the elastic support member is a conductor in order to solve the above problems.

  According to the above configuration, the elastic support member can be used as a means for energizing the focus coil, the tracking coil, or the tilt correction coil. Therefore, it is not necessary to separately provide wiring for supplying current to the focus coil, tracking coil, or tilt correction coil, and the structure of the movable part can be simplified and lightened, and tilt correction can be performed. It is possible to improve the sensitivity.

  The optical pickup apparatus according to the present invention is characterized in that, in order to solve the above-described problems, the elastic support member is an energization means for the tilt correction coil.

  According to the above configuration, there is no need to separately provide wiring for supplying current to the tilt correction coil, the structure of the movable part can be simplified and lightened, and the sensitivity of tilt correction can be improved. It becomes possible.

  The optical pickup device according to the present invention is characterized by comprising at least six elastic support members in order to solve the above-mentioned problems.

  According to the above configuration, the elastic support member can be used as a means for energizing the focus coil, the tracking coil, and the tilt correction coil. Therefore, there is no need to separately provide wiring for supplying current to the focus coil, tracking coil, and tilt correction coil, and the structure of the movable part can be simplified and lightened, and the tilt can be reduced. It becomes possible to improve the sensitivity of correction.

  On the other hand, in order to solve the above-mentioned problems, an electronic apparatus according to the present invention includes any one of the optical pickup devices described above.

  According to the above configuration, it is possible to provide an electronic apparatus capable of recording an enormous amount of data on an optical disc recording medium at high density and high speed. Therefore, it is possible to reduce the size of the electronic device body and increase the speed of data access.

  The optical pickup device according to the present invention has a tilt correction mechanism for warping of the optical disk recording medium, and supports a high-density / large-capacity optical information disk device without increasing the size of the optical pickup device. There is an effect that an optical pickup device can be provided.

  Furthermore, it is possible to provide an electronic device having a large data capacity and capable of accessing data at high speed while suppressing an increase in the size of the device body.

  The embodiment of the present invention will be described as follows. Note that the present invention is not limited to this.

  Here, in the present invention, the “movable part” is a member for fixing the objective lens, and is cantilevered by the support part by the elastic support member. Further, it is a member that can move according to the action of each driving means such as focus driving, tracking driving, and tilt correction.

  The “support portion” is a member to which an elastic support member is fixed and cantilever-supports the movable portion via the elastic support member. In particular, it is different from the “base member” in which the elastic support member is not directly fixed and the support portion is fixed.

  Hereinafter, the configuration of an aspect of the optical pickup device according to the present invention will be described with reference to FIGS. 1, 2, 3, and 4. Here, FIG. 1 is a top view of the optical pickup device according to the present invention, FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1, FIG. 3 is a partially enlarged view of FIG. It is a perspective view of a correction magnet.

  In FIG. 1, the solid arrow indicates the tracking direction, and the broken arrow indicates the rotation direction in tilt correction.

  A solid line arrow in FIG. 2 indicates a focus direction.

  An optical pickup device 20 according to the present invention includes a movable part 2 used for fixing the objective lens 1, a support part 13 used for supporting the movable part 2, and a base member for fixing the support part 13. 8, an elastic support member 6 used for supporting the movable part 2 on the support part 13, and a focus driving means for driving the objective lens 2 in the optical axis direction of the light beam emitted from the objective lens 1. Tracking drive means for driving the objective lens 1 in the radial direction of an optical disk recording medium (not shown) arranged for reading or writing information, and a light beam emitted from the objective lens 1 It is used as tilt correction means for driving the objective lens 1 so that the optical axis is perpendicular to the disk surface of an optical disk recording medium (not shown). And a tilt correction coil 10 and the tilt correction magnet 9.

  The focusing means and tracking means used in the optical pickup apparatus according to the present invention are not particularly limited, and conventionally known focusing means and tracking means may be appropriately selected and used. Here, the focus driving means in the present embodiment includes a magnetic circuit formed by the magnets 3 a and 3 b and the focusing coil 5. The tracking drive means in the present embodiment is constituted by a magnetic circuit formed by the magnets 3 a and 3 b and the tracking coil 4. At this time, the magnets 3 a and 3 b are provided on the base member 8, and the focusing coil 5 and the tracking coil 4 are provided on the movable portion 2.

  The installation locations of the magnet 3a, the magnet 3b, the focus coil 5 and the tracking coil 4 are not limited to the above, and the magnets 3a and 3b are provided in the movable portion 2, and the focus coil 5 and the tracking coil 4 are provided. The aspect provided in the base member 8 may be sufficient. Further, the focusing coil 5 and the tracking coil 4 may be provided on the support portion 13.

  However, as in the optical pickup device 20 according to the present embodiment, a mode in which the magnets 3a and 3b are provided on the base member 8 and the focusing coil 5 and the tracking coil 4 are provided on the movable portion 2 is more preferable. It can be said. This means that the heavy magnets 3a and 3b are not in the movable part 2 but in the support part 13 (or the base member 8), and the tilt correction coil is in a position closer to the fulcrum of the movable part. Therefore, the weight of the movable part, particularly the tip of the movable part, which is the point of action, becomes lighter, and even when the same driving force is applied, it is possible to drive the objective lens with high speed and high sensitivity. . Further, since it is difficult to be influenced by the surrounding magnetic metal, there is an advantage that it is difficult to generate a restriction that a non-magnetic material must be used in the surrounding area.

  The magnetic circuit constituting the focus driving means / tracking driving means is also used as the magnetic circuit formed by the magnet 3a and the magnet 3b. However, the magnetic circuit constituting the focus driving means, that is, the focus driving means. The magnetic circuit which comprises a magnet and the tracking drive means, ie, the structure provided with the tracking drive magnet separately may be sufficient. However, from the viewpoint of simplification of the structure, reduction in the number of parts, and the like, it can be said that the configuration shown in this embodiment is preferable.

  The driving mechanism in the focus direction and the tracking direction of the optical pickup device according to the present embodiment is the same as that described in the “Background Art” section, and therefore, the description thereof is omitted here.

  By the way, in the optical pickup device 20 according to the present embodiment, the tilt correction coil 10 is a part of the movable part 2 that is closer to the support part 13 than the part to which the objective lens 1 is fixed. Is provided. In other words, the tilt correction coil 1 is provided in the movable portion 2 between the objective lens 1 and the support portion 13.

  Further, the tilt correcting magnet 9 is provided in a portion sandwiched between the elastic support members 6 of the support portion 13. The movable part 2 is cantilevered on the support part 13 by an elastic support member 6 facing the at least two disk surfaces in a substantially horizontal direction. In the optical pickup device according to the present invention, the tilt correcting magnet 9 is located on a portion on the support portion 13 and between the portions to which the elastic support member 6 is fixed. That is, the positional relationship between the elastic support member 6 and the tilt correction magnet 9 on the support portion 13 is as follows: elastic support member 6 → tilt correction magnet 9 → elastic support member 6 in a direction horizontal to the disk surface.

  Furthermore, in the optical pickup device 20 according to the present embodiment, the tilt correction coil 10 and the tilt correction magnet 9 are arranged at positions facing each other. At this time, by energizing the tilt correction coil 10, a rotational moment is generated in the movable portion 2, and tilt correction in the warp direction of the optical disk recording medium can be performed. The details of the tilt correction operation will be described later.

  Further, the optical pickup device 20 according to the present embodiment includes a yoke 12 connected to the tilt correction magnet 9.

  Here, the “yoke” is a fixed magnetic body that functions to guide a magnetic flux generated from a magnet (magnet, coil, etc.) to an arbitrary place, and is also called “a yoke”.

  Therefore, in this embodiment, the yoke 12 is arranged so that the magnetic flux generated from the tilt correction magnet 9 is collected in the tilt correction coil 10. In other words, one end of the yoke 12 magnetically connected to the tilt correction magnet 9 is disposed so as to be inserted inside the tilt correction coil 10.

  By installing the yoke 12 in this way, a closed circuit of the magnetic field is formed, and the sensitivity of tilt correction can be further increased. This means that the tilt correction coil 10 mounted on the movable part 2 can be made smaller, and the weight increase of the movable part 2 can be minimized.

  The yoke is not particularly limited as long as it is a magnetic material, and a known material conventionally used as the yoke may be appropriately selected and applied. For example, iron, nickel, cobalt, ferrite and the like can be suitably used.

  Further, in the optical pickup device 20 according to the present embodiment, a magnetic circuit in which the tilt correction magnet 9 and the yoke 12 are connected, and the tilt correction coil 10 are arranged in the track direction, and further the tilt correction magnet. 9 S poles and N poles are arranged in a direction perpendicular to the track direction on a plane substantially parallel to the disk surface of the optical disk recording medium (not shown), and the tilt correction coil 10 includes an objective lens. 1 is wound around an axis parallel to the optical axis of the light beam emitted from 1.

  Since the movable portion 2 is movable in the focus direction and the track direction, it is necessary to work effectively even when the tilt correction is moved in the focus and track directions. For this purpose, the tilt correction coil 10 is wound around the same way as the focus 5 coil, that is, around an axis parallel to the optical axis of the light beam emitted from the objective lens 1. Further, the magnetic circuit formed by the tilt correction magnet 9 and the tilt correction yoke 12 provided on the support portion 3 side and the tilt correction coil 10 are arranged in the track direction, and the S pole of the tilt correction magnet 9 is further provided. And N poles are arranged in a direction perpendicular to the track direction on a plane substantially parallel to the disk surface of the optical disk recording medium (not shown). Thereby, even when the movable part 2 is movable in the focus direction and the track direction and is offset from the reference position (the initial position where the movable part 2 is not movable), the tilt correction coil 10 and the tilt correction magnet are used. Since 9 has a sufficient size, tilt correction can be performed.

  In order for the optical pickup device 20 according to the present embodiment to perform tilt correction, the movable portion 2 needs to have a rotational moment that drives the optical disc recording medium at an angular deviation in the radial direction. Therefore, in the optical pickup device 20 according to the present embodiment, the tilt correction magnet 9 includes at least two magnets having opposite magnetic field directions, and the magnetic field direction from the magnets is substantially parallel to the track direction. It is assumed that they are juxtaposed.

  By making the tilt correction magnet 9 as described above, as shown in FIG. 3, a rotational moment is generated in the movable part 2 to drive the optical disk recording medium at an angular deviation in the radial direction. The details of the rotational moment generation mechanism are as follows. In addition, the dashed-dotted line in FIG. 3 has shown the rotation center line of the movable part 2 at the time of performing tilt correction.

  A tilt correction coil 10 is provided in the movable portion 2 so as to cross a magnetic field from a magnetic circuit formed by the tilt correction magnet 9 and the yoke 12. At this time, the tilt correcting coil 10 is wound in a single direction, like the focusing coil 5. In order to give a rotational moment to the tilt correction coil 10 (movable part 2), the direction of the magnetic field acting on the tilt correction coil 10 may be reversed with the approximate rotation center of the movable part 2 as a boundary. Thus, even when the tilt correction coil 10 wound in a single direction is used, the direction of the force applied to the tilt correction coil 10 is movable as shown by the arrow in FIG. 2 is reversed with the approximate center of rotation as a boundary, and a rotational moment is generated. Therefore, tilt correction can be performed in the optical pickup device 20 according to the present embodiment.

  In the optical pickup device 20 according to the present embodiment, a multipolar magnet formed by integrally forming at least two magnets having opposite magnetic field directions may be used as the tilt correction magnet 9. An example of such a multipolar magnet is shown in FIG. The multipolar magnet shown in FIG. 4 is formed by integrally molding two magnets having opposite magnetic field directions. In this case, the two S poles (shaded portions in FIG. 4) and the two N poles (outlined portions in FIG. 4) of the multipolar magnet are aligned on the diagonal line.

  Such multipolar magnets have the above-mentioned multipolarity from the time of manufacture even if they are manufactured separately using an adhesive or the like so that the magnetic field directions are arranged opposite to each other. It may be manufactured.

  If such a multipolar magnet is used as a tilt correction magnet and the optical pickup device 20 is arranged so that the direction of the magnetic field is substantially parallel to the track direction, a rotational moment is generated in the tilt correction coil 10 (movable part 2) as described above. Therefore, tilt correction can be performed in the optical pickup device 20 according to the present embodiment.

  Furthermore, by setting it as this aspect, the increase in the number of parts of the magnet accompanying increase in the direction of a magnetic field can be prevented. Furthermore, since it is a single magnet, the positional relationship between different magnetic fields can be accurately controlled, and the sensitivity of tilt correction can be further improved.

  In the optical pickup device 20 according to the present embodiment, it is preferable that the elastic support member 6 is an elastic body (substance having a spring property) and a conductor. The material of the elastic support member 6 is not particularly limited as long as it is a substance having the above physical properties. For example, copper alloys such as phosphor bronze, white and titanium copper, and stainless steel (SUS type) are preferable. Is available.

  Further, the shape is not particularly limited, and may be a leaf spring shape or a wire shape.

  According to the above configuration, the elastic support member 6 can be used as a means for energizing the focus coil 5, the tracking coil 4, or the tilt correction coil 10. Therefore, there is no need to separately provide a lead-in wire or the like for supplying a current to the focus coil 5, the tracking coil 4, or the tilt correction coil 10, and the structure of the movable portion 2 can be simplified and reduced in weight. In addition, the sensitivity of tilt correction can be improved.

  Further, the optical pickup device 20 according to the present embodiment preferably includes at least six elastic support members 6 made of a conductor. However, it is preferable that the number of elastic support members is six for reasons such as simplification of the structure to prevent an increase in the number of parts.

  According to the above configuration, the elastic support member 6 can be used as a means for energizing the focusing coil 5, the tracking coil 4, and the tilt correction coil 10.

  The means for connecting the elastic support member 6 to each coil (the focus coil 5, the tracking coil 4, and the tilt correction coil 10) is not particularly limited, but may be performed as follows, for example. it can. First, the elastic support member 6 that supports the movable portion 2 is connected to the elastic support member mounting substrates 15 and 16. The elastic support member mounting substrate 16 and the current supply means are electrically connected, and the elastic support member mounting substrate 15 and each of the coils are electrically connected. Thereafter, if a current is supplied from the current supply means, a current can be supplied to each coil.

  Therefore, with the above configuration, there is no need to separately provide wiring for supplying current to the focusing coil 5, the tracking coil 4, and the tilt correction coil 10, and the structure of the movable portion is simplified and lightweight. It is possible to improve the sensitivity of tilt correction.

  On the other hand, an electronic apparatus according to the present invention includes the optical pickup device described above. The electronic device according to the present invention is not particularly limited as long as it is an electronic device capable of reproducing or recording an optical disk recording medium. For example, an information recording unit of a personal computer, an audio device such as a CD / MD, a video device such as a DVD player / DVD recorder / laser disk player, and a recording medium other than the above-mentioned disk standards may be reproduced or recorded. It can be used for possible devices.

  According to the above configuration, it is possible to provide an electronic apparatus capable of recording an enormous amount of data on an optical disc recording medium at high density and high speed. Therefore, it is possible to reduce the size of the electronic device body and increase the speed of data access.

  The optical pickup device according to the present invention may have the following modes.

  (1) Focus (optical axis direction), tracking (radial direction of the optical information disk medium), and tilt correction (radius due to the wrinkle-like warpage of the optical information disk medium) In an optical pickup apparatus having an actuator mechanism for an objective lens that is driven in three directions (an angular deviation in direction), the lens holder that holds the objective lens is elastically cantilevered at one end of six or more elastic support members. The other end of the elastic support spring material is supported by a fixed holder, and the lens holder is provided with an objective lens, each coil for focus drive and tracking drive, and at least one coil for tilt correction. Focus and tracking magnets on the fixed holder side, and the tilt compensation The magnet for tilt correction is driven by the tilt coil when the coil is energized, and the tilt correction coil is provided on the side opposite to the side where the objective lens is disposed in the lens holder. An optical pickup device, wherein the optical pickup device is disposed at a portion sandwiched between the elastic support member, the lens holder, and a fixed side holding portion of the elastic member.

  (2) In the optical pickup device configured as described in (1) above, at least two of the six or more elastic support members supporting the lens holder supply current to the tilt correction coil provided in the lens holder. An optical pickup device characterized by being able to be used.

  (3) The optical pickup device having the above-described configuration (1) includes a yoke material magnetically connected to the tilt correction magnet on the fixed holder side, and the yoke material rectifies a magnetic field formed by the tilt correction magnet. An optical pickup device characterized by that.

  (4) In the optical pickup device configured as described in (1) and (3) above, a magnetic circuit and an optical system formed by a tilt correction magnet and a yoke material provided on the fixed holder side are connected to an optical information disk medium. Arranged in the track direction, the S and N poles of the tilt correction magnet are arranged in a plane substantially parallel to the optical information disk medium and perpendicular to the track direction, and the tilt correction coil is located in the objective lens in the same manner as the focus coil. An optical pickup device wound around an axis parallel to the optical axis.

  (5) In the optical pickup device configured as described in (1) above, the tilt correction magnet has a magnetic field formed by the magnet substantially parallel to the track direction of the optical information disk medium, and is formed by the magnet and the yoke material. An optical pickup device comprising magnets arranged in such a manner that the directions of magnetic fields are opposite to each other.

  (6) In the optical pickup device having the configuration of (5), the tilt correction magnet has multiple polarities and is formed as a single body.

  On the other hand, the present invention also includes an electronic apparatus comprising the optical pickup device according to any one of (1) to (6) above.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The optical pickup device according to the present invention has a tilt correction mechanism for warping of the optical disk recording medium, and supports a high-density / large-capacity optical information disk device without increasing the size of the optical pickup device. There is an effect that an optical pickup device can be provided. Furthermore, it is possible to provide an electronic device having a large data capacity and capable of accessing data at high speed while suppressing an increase in the size of the device body.

  Therefore, the present invention can be applied to the entire electronic / electric equipment industry including computers, audio equipment, and video equipment using an optical disk recording medium.

1 is a top view of an optical pickup device according to an embodiment of the present invention. 1 is a cross-sectional view of an optical pickup device according to an embodiment of the present invention. 1 is a partial enlarged view of an optical pickup device according to an embodiment of the present invention. It is a perspective view of the magnet for tilt correction (multipolar magnet) used in one embodiment of the present invention. It is a top view of the optical pick-up apparatus concerning a prior art example. It is a side view of the optical pick-up apparatus concerning a prior art example. It is a sectional side view of the optical pick-up apparatus concerning a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Objective lens 2 Movable part 3a Magnet 3b Magnet 4 Tracking coil 5 Focusing coil 6 Elastic support member 9 Tilt correction magnet 10 Tilt correction coil 12 Tilt correction yoke 13 Support part 15 Elastic support member mounting board 16 Elastic support member Mounting substrate 20 Optical pickup device 21 Optical pickup device

Claims (10)

A movable part having an objective lens;
At least a pair of elastic support members for supporting the movable portion at one end thereof;
A support portion for supporting the other end of the elastic support member;
In an optical pickup device comprising tilt correction means for driving the movable part in a direction for correcting the tilt of the objective lens relative to the optical disk recording medium
A tilt correction coil provided in a movable part between the objective lens and the support part;
An optical pickup device comprising a tilt correction magnet provided in a portion sandwiched between elastic support members of the support portion. A focusing coil, which is a focusing means for driving the movable part in the focusing direction, and a tracking coil, which is a tracking means for driving the movable part in the tracking direction, are provided in the movable part,
The optical pickup device according to claim 1, wherein the focusing unit and the magnet serving as the tracking unit are provided on the support part or a base member to which the support part is fixed.   The optical pickup device according to claim 1, further comprising a yoke connected to the tilt correction magnet. The magnetic circuit in which the tilt correction magnet and the yoke are connected, and the tilt correction coil are arranged in the track direction,
S poles and N poles of the tilt correction magnet are arranged in a direction perpendicular to the track direction on a plane substantially parallel to the disk surface of the optical disk recording medium,
4. The tilt correction coil according to claim 1, wherein the tilt correction coil is wound around an axis parallel to an optical axis of a light beam emitted through the objective lens. 5. Optical pickup device. The tilt correction magnet is
5. The magnet according to claim 1, wherein at least two magnets having opposite magnetic field directions are juxtaposed so that the direction of the magnetic field from the magnets is substantially parallel to the track direction. 2. An optical pickup device according to item 1. As the tilt correction magnet,
6. The optical pickup device according to claim 1, wherein a multipolar magnet formed by integrally molding at least two magnets having opposite magnetic field directions is used.   The optical pickup device according to claim 1, wherein the elastic support member is a conductor.   8. The optical pickup device according to claim 7, wherein the elastic support member is an energization unit for the tilt correction coil.   The optical pickup device according to claim 8, comprising at least six elastic support members. An electronic apparatus comprising the optical pickup device according to claim 1.

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