JP2006323916A - Objective lens driving apparatus, method for forming elastic support member of objective lens driving apparatus, optical pickup device, and optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce thickness in an objective lens driving apparatus of triaxial drive. <P>SOLUTION: Six wire springs 7 are arranged and respective three pieces each of the wire springs 7 are arranged on a first plane P1 perpendicular to a focusing direction and on a second plane P2, with their approximate tangential directions set as a longitudinal direction. The two pieces of the wire springs 7 on the first plane P1 are arranged on the first side face S1 side in the tracking direction of a movable object including an objective lens holding member 2 and the one piece is arranged on the second side face S2 side on the side opposite to the first side face S1 side. Also, the one piece of the wire springs 7 on the second plane P2 is arranged on the first side plane S1 side, and the two pieces are arranged on the second side plane S2 side. Thereby, the centers (centroid and center of inertia) of the movable parts can be easily aligned to the driving center and the supporting center and therefore, the accurate operation is made possoble. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an objective lens driving device for driving an objective lens for condensing a light beam for recording / reproducing with respect to an optical disk, which is an optical recording medium, in a focusing direction and a tracking direction, and the objective lens driving device. The present invention relates to a method for forming an elastic support member used in the above, and an optical pickup device and an optical disc device equipped with the objective lens driving device.

  In an optical disk device, information is read by irradiating an optical disk with a light beam emitted from a laser and identifying the reflected light. Here, in the objective lens driving device mounted on the optical disc device, by controlling the objective lens to follow the movement of the optical disc such as surface deflection and eccentricity using a control signal obtained from the reflected light, It is configured to drive in the focusing direction and the tracking direction to appropriately form spots on the recording surface of the optical disc.

  In order to cope with the recent increase in density of optical discs, it is necessary to form a small spot. For this purpose, it is necessary to increase the NA of the objective lens or shorten the wavelength of the laser.

  However, when the NA is increased or the wavelength of the laser is shortened, coma aberration is likely to occur due to the deviation of the optical axis of the objective lens from the perpendicularity of the optical disc, and the spot quality is deteriorated. This causes a problem that the recording / reproduction quality deteriorates. Therefore, it is necessary to improve the tilt accuracy of the optical disk and the objective lens.

  Therefore, it is desirable for the objective lens driving device to prevent the movable part (objective lens) from being tilted when focusing or tracking (see Patent Documents 1 and 2).

  Recently, the accuracy with respect to tilt has become particularly strict, and the tilt (tilt) of the optical disk and the objective lens is tilted, and the movable part of the objective lens driving device including the objective lens is tilt-driven (tilt operation) according to the tilt of the optical disk. A system equipped with a driving objective lens driving device has also been proposed (see Patent Documents 3 to 5).

  On the other hand, since the optical disk apparatus is also in demand for mobile applications such as notebook computers, it is desired to make the apparatus thin.

  A conventional objective lens driving device will be described below with reference to the drawings.

  FIG. 15 is a perspective view showing a conventional example of an objective lens driving device capable of tilt driving.

  In FIG. 15, the objective lens 1 is held by the objective lens holding member 2, and focusing and tracking drive coils 3 are provided on both side surfaces in the tangential direction of the objective lens holding member 2. A relay substrate 4 is provided on both side surfaces in the tracking direction of the objective lens holding member 2 to form a movable portion. A terminal (not shown) of the drive coil 3 is connected to the land portion of the relay substrate 4.

  A bent portion of the base 5 formed by bending a magnetic metal plate is a yoke portion 5a. A driving magnet 6 is provided on the yoke portion 5a so as to be opposed to the driving coil 3 at a predetermined gap. A magnetic circuit is configured.

  Furthermore, with the tangential direction as the longitudinal direction, three straight wire springs 7-1 are arranged on both sides in the tracking direction of the movable portion, respectively, and aligned in the focusing direction, and one end of the wire spring 7-1 is The other end of the wire spring 7-1 is fixed to a fixing member 8 provided on the base 5 and fixed to the land portion of the relay substrate 4 on the movable portion.

  The wire spring 7-1 is electrically conductive, and both ends thereof are also electrically connected. By supplying current to the drive coil 3 from the fixed member 8 side, the magnetic circuit is operated to focus the movable part. / Tracking drive can be performed.

  FIG. 16 is a perspective view showing another conventional example of an objective lens driving apparatus capable of tilt driving. Members corresponding to those described in FIG.

  The focusing / tracking biaxially driven objective lens driving device shown in FIG. 16 has a leaf spring 7-2 as a wire spring protruding from the side of the resin objective lens holding member 2 and a fixed member 8. This is an insert-molded structure.

In such a configuration, as shown in FIG. 17, three thin plate members 9 can be punched out to form a rod-shaped plate spring 7-2 with high accuracy, and the resin portion (the protruding portion of the objective lens holding member 2) , The fixing member 8) is used to fix the insert, so that the assembly accuracy of the support system can be made higher than the solder fixing of the wire spring 7-1 as shown in FIG.
JP 2004-13997 A JP 2004-95133 A JP 2000-149292 A JP 2001-118269 A Japanese Patent No. 3583074

  However, when the wire spring 7-1 is arranged as in the objective lens driving device as shown in FIG. 15, the outer shape in the focusing direction becomes large on the relay substrate 4 in order to secure the land space of the solder connection portion. Therefore, it is difficult to reduce the thickness, and there is a risk of shorting between lands.

  In order to reduce the thickness, two wire springs are added to the four wire springs, and in Patent Documents 3 and 4 in which the wire springs are arranged on two planes, two wires springs are added to the four wire springs. In order to extremely reduce the rigidity of the wire spring, it is necessary to make it difficult to manufacture such as a coil shape.

  Further, in Patent Document 3, since the support center is too close to the optical disc installation side, the spindle motor that drives the optical disc can be disposed only in the upper part of the movable portion made of an objective lens holding member or the like. There was a problem of shortage.

  In the objective lens driving device having the three-axis driving structure as shown in FIG. 16, as shown in FIG. 17, three plate members 9 are required to secure six leaf springs 7-2. For this reason, leaf spring molding becomes very difficult and the cost increases. Further, since the assembly position shift of the three plate members 9 accumulates, there is a problem that tilt is likely to occur during the focusing / tracking operation.

  An object of the present invention is to solve the above-described problems of the prior art and make it possible to reduce the thickness of a three-axis driving objective lens driving device, and to simplify the structure of integral molding and reduce the cost.

  In order to achieve the above object, an invention according to claim 1 is directed to an objective lens for condensing a light beam on an optical disc, an objective lens holding member for holding the objective lens, and the objective lens holding member in a focusing direction. In an objective lens driving device including an electromagnetic drive member that drives in a tracking direction and a rod-like elastic support member that supports the objective lens holding member so as to be movable with respect to a fixed portion, the rod-like elastic support member is perpendicular to the focusing direction. Three each on the first plane and on the second plane are arranged with the substantially tangential direction as the longitudinal direction, and the rod-like elastic support members on the first plane are arranged in the tracking direction of the objective lens holding member. Are arranged on the first side surface side, and on the second side surface side opposite to the first side surface, and on the second flat surface side. One of the above rod-like elastic support members is arranged on the first side surface side and two on the second side surface side, and this configuration makes it possible to drive a three-axis driving objective lens driving device. The support center is arranged at the approximate center in the focusing direction of the movable portion made of an objective lens holding member or the like. For example, the arrangement area of the motor for driving the optical disk can be increased and the thrust can be increased.

  According to a second aspect of the present invention, in the objective lens driving device according to the first aspect, the two rod-like elastic support members are formed thinner than the one rod-like elastic support member. The two rod-like elastic support members are set to have substantially the same spring constant as that of one rod-like elastic support member. With this configuration, the movable part made up of an objective lens holding member or the like is supported 4. By making the spring constants of the portions substantially equal, the tilt of the objective lens generated during the focusing / tracking operation can be reduced.

  According to a third aspect of the present invention, in the objective lens driving device according to the first aspect, the two rod-shaped elastic support members are formed longer than the one rod-shaped elastic support member. The two rod-like elastic support members are set so as to have a spring constant substantially equivalent to one, and with this configuration, four spring constants for supporting the movable portion made of the objective lens holding member and the like are provided. By making these substantially equal, it is possible to reduce the tilt of the objective lens that occurs during the focusing / tracking operation.

  According to a fourth aspect of the present invention, in the objective lens driving device according to any one of the first to third aspects, the end on the objective lens holding member side of the rod-shaped elastic support member in the portion where the two are disposed, The objective lens holding member is fixed to both sides with a relay substrate attached to the first side surface and the second side surface of the objective lens holding member. With this configuration, the rod-like elastic support member is fixed to the relay substrate. However, the number of parts can be reduced, the configuration can be simplified, and the cost can be reduced. Moreover, it is possible to prevent adjacent wires from interfering with each other.

  According to a fifth aspect of the present invention, in the objective lens driving device according to any one of the first to fourth aspects, the distance between the ends on the fixed portion side of the two rod-shaped elastic support members in the portion arranged is determined by the objective. It is characterized by being arranged so as to be wider than the interval between the end portions on the lens holding member side, and this structure secures a space such as a solder land at the end portion on the fixed portion side of the rod-like elastic support member. be able to.

  According to a sixth aspect of the present invention, in the objective lens driving device according to any one of the first to fifth aspects, the rod-like elastic support member is a plate-like body, and the end of the plate-like body is fixed to the objective lens holding member. It is characterized in that it is embedded in at least one of the parts integrally, and this structure simplifies the support structure of the rod-like elastic support member.

  The invention according to claim 7 is a method of forming the rod-like elastic support member according to claim 6, wherein two wide leaf spring members perpendicular to the focusing direction are connected to the objective lens holding member and the fixing portion. It is formed integrally with at least one, and unnecessary portions are removed to form a plurality of narrow plate-like bodies, which are used as the rod-like elastic support member. A three-axis driving objective lens driving device including six support members can be configured.

  According to an eighth aspect of the present invention, in the optical pickup device, the light source that emits irradiation light to the optical disc, the light receiving optical system that receives the reflected light from the optical disc, and the optical pickup device according to any one of the first to sixth aspects An objective lens driving device is provided. With this configuration, a good signal can be obtained by reducing the tilt deviation between the optical disk and the objective lens, and a thin objective lens driving device is mounted. This makes it possible to reduce the thickness.

  According to a ninth aspect of the present invention, in the optical pickup device, the optical pickup device includes a light source that emits irradiation light to the optical disc and a light receiving optical system that receives the reflected light from the optical disc, and is perpendicular to the focusing direction according to the first aspect. In the first plane and the second plane, the first plane is set closer to the optical disc side than the second plane in the focusing direction, and at a position overlapping the second plane in the focusing direction. A light beam is incident from the light source on the objective lens driving device according to claim 3 from the direction of the first side surface according to claim 1, and with this configuration, the tilt deviation between the optical disk and the objective lens is reduced. As a result, a good signal can be obtained and the objective lens driving device and the optical system are laid out in a position overlapping in the focusing direction. By a, it is possible to further thinner.

  According to a tenth aspect of the present invention, in the optical disc apparatus, the apparatus includes a rotation driving member that rotationally drives the optical disc, and the optical pickup device according to the eighth or ninth aspect that is provided so as to be movable in a radial direction of the optical disc. With this configuration, it is possible to read and write data satisfactorily by using an optical pickup capable of obtaining a good signal.

  According to an eleventh aspect of the present invention, in the optical disc apparatus, the optical disc apparatus includes a rotation driving member that rotationally drives the optical disc, and an optical pickup device that is provided so as to be movable in a radial direction of the optical disc. The first side and the second plane perpendicular to each other are set such that the first plane is closer to the optical disc side than the second plane in the focusing direction, and the second side surface according to claim 1 is the inner side of the optical disc. The objective lens driving device according to claim 3 is arranged so as to be on the circumferential side. With this configuration, it is possible to read and write data satisfactorily by using an optical pickup device that can obtain a good signal. For example, when the optical pickup device moves to the innermost circumference of the disc, the turntable and objective lens of the optical disc A rod-shaped elastic support members of the dynamic apparatus is hardly interfere.

  According to the present invention, it is possible to arrange the support center of the triaxially driven objective lens driving device at the approximate center in the focusing direction of the movable portion made of the objective lens holding member and the like, and to make it thin. become.

  In addition, the rod-like elastic support member in the three-axis drive objective lens driving device can be integrally molded to simplify the configuration and reduce the cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of an objective lens driving device for explaining the first embodiment of the present invention, and FIG. 2 is a partial sectional view of the objective lens driving device of the first embodiment.

  In FIG. 1, an objective lens 1 is held by an objective lens holding member 2, and focusing, tracking, and tilt control of the objective lens holding member 2 are performed on both side surfaces in the tangential direction of the objective lens holding member 2. A drive coil 3 is provided, and relay boards 4 are provided on both side surfaces in the tracking direction of the objective lens holding member 2 to constitute a movable portion. A terminal (not shown) of the drive coil 3 is connected to the land portion of the relay substrate 4.

  A bent portion of the base 5 formed by bending a magnetic metal plate is a yoke portion 5a. A drive magnet 6 is provided on the yoke portion 5a so as to be opposed to the drive coil 3 at a predetermined gap. A magnetic circuit is configured.

  Further, with the tangential direction as the longitudinal direction, two straight wire springs 7 that are rod-like elastic support members are provided at one diagonal portion of the four corners of the movable portion and the other diagonal when viewed from the tangential direction. A total of six are arranged in each part.

  One end of the wire spring 7 is fixed to the land portion of the relay substrate 4 on the movable portion, and the other end of the wire spring 7 is fixed to the fixing member 8 of the base 5. In this embodiment, a space is provided on the back surface (movable part side) of the relay board 4, and one end of the adjacent two wire springs 7 on the movable part side is fixed on both sides of the relay board 4. Can be done.

  FIG. 2 is a diagram of the positional relationship among the movable portions such as the objective lens holding member 2 and the drive coil 3, the wire spring 7, and the relay substrate 4 as seen from the tangential direction. However, solder is omitted in FIG.

  The wire spring 7 is conductive, and both ends thereof are electrically connected to each part. The drive coil 3 attached to the movable part is a focusing coil 3a, a tracking coil 3b, and a radial tilt coil 3c, and operates the magnetic circuit by flowing a current from the fixed member 8 to each drive coil 3. Thus, the movable part is driven for each control of focusing, tracking, and tilt.

  In the first embodiment, as shown in FIG. 2, six wire springs 7 are arranged, and the wire springs 7 are respectively on the first plane P1 and the second plane P2 perpendicular to the focusing direction. Three wire springs 7 on the first plane P1 are disposed on the first side surface S1 side in the tracking direction of the movable body including the objective lens holding member 2, and three wire springs 7 are disposed on the first plane P1. One wire spring 7 on the second plane P2 is disposed on the first side surface S1 side, and one wire spring 7 on the second plane P2 is disposed on the first side surface S1 side. Two of the two side surfaces S2 are arranged.

  For this reason, in Embodiment 1, since the center (center of gravity, center of inertia) of the movable part, the drive center, and the support center can be easily matched, it is possible to perform a highly accurate operation.

  FIG. 3 is a perspective view showing a first modification of the first embodiment. In the configuration shown in FIGS. 1 and 2, the land space for fixing the end of the wire spring 7 on the fixing member 8 side is narrow. Therefore, in the first modification, one of the two adjacent wire springs 7 is inclined so that the gap G between the ends on the fixed member 8 side is wider than the gap between the ends on the relay substrate 4 of the movable part. It is.

  4 is a perspective view showing a second modification of the first embodiment. As shown in FIGS. 1 and 2, the wire spring 7 has two adjacent portions (the wire spring of A portion in FIG. 4). If the same wire diameter is used for one part (the wire spring of the B part in FIG. 4), the movable part may be tilted about the diagonal line as viewed from the tangential direction. In the second modification, in order to prevent this, the wire diameter of the wire spring 7 in the portion A adjacent to each other is made thinner than that in the single portion B so as to achieve a balance.

  FIG. 5 is a perspective view of an objective lens driving device for explaining the second embodiment of the present invention, and FIG. 6 is a partial sectional view of the objective lens driving device of the second embodiment. In addition, in the following description, the same code | symbol is attached | subjected to the member corresponding to the member demonstrated in FIGS. 1-4, and detailed description is abbreviate | omitted.

  The second embodiment is different from the first embodiment in the configuration of the rod-like elastic support member that supports the movable portion.

  In FIG. 5, a protruding portion 10 is formed on the side surface of the objective lens holding member 2 in the tracking direction, and the protruding portion 10 and the fixing member 8 are rod-like elastic support members whose longitudinal direction is the tangential direction. A rod-shaped leaf spring 11 is insert-molded. The arrangement of the six bar-shaped leaf springs 11 is the same as that of the first embodiment as shown in FIG.

  Note that the end of the bar-shaped plate spring 11 (or the wire spring 7) may be integrated by insert molding into either the protruding portion 10 or the fixing member 8 instead of the both ends.

  FIG. 7 is a perspective view for explaining a manufacturing method of the bar-shaped plate spring 11 of the second embodiment. The six bar-shaped plate springs 11 are originally formed by punching a thin plate material 12 having wide elasticity. The plate material 12 is positioned on the molding die at a predetermined interval, and then the resin is poured into the formation portion of the protrusion 10 and the fixing member 8 of the objective lens holding member 2 and molded. The components are as shown in FIG.

  The objective lens driving device according to the second embodiment is assembled using an object obtained by removing unnecessary portions (frame portions) in the plate 12. As shown in FIG. 6, the remaining part of the bar-shaped leaf spring 11 that is not removed is two in one diagonal portion of the four corners of the movable portion and the other diagonal portion in the tangential direction. A total of six are arranged one by one.

  Although not shown, the portion that does not perform the spring function of the bar-shaped plate spring 11 is slightly protruded from the inserted resin portion, and is connected to the terminal of the drive coil 3 at this protruding portion, thereby fixing member 8. It is also possible to adopt a configuration in which current is supplied to the drive coil 3.

  FIG. 8 is a perspective view showing a first modification of the second embodiment, and, as shown in FIGS. 5 to 7, a portion where two bar-shaped leaf springs 11 are adjacent to each other (in FIG. 8, a portion A-shaped leaf spring). If the length in the longitudinal direction of the bar-shaped leaf spring 11 is the same in one portion (the bar-shaped leaf spring in B portion in FIG. 8), the diagonal line as viewed from the tangential direction is taken as the axis. In some cases, the movable part is inclined in the direction of rotation. In order to prevent this, in the first modification example, the length of the wire spring 11 of the portion A adjacent to each other is made longer than that of the single portion B so as to achieve a balance.

  At this time, the fixed end of the rod-shaped leaf spring 11 on the movable portion side is fixed to a pair of projecting portions 10a and 10b that project from the side surface in the tracking direction of the objective lens holding member 2 while being offset in the tangential direction. As a result, the lengths of the end portions of the bar-shaped plate springs 11 on the fixing member 8 side coincide with each other, so that the objective lens driving device can be made compact.

  FIG. 9 is a schematic configuration diagram of Embodiment 1 of an optical pickup device equipped with an objective lens driving device according to the present invention.

  In FIG. 9, reference numeral 21 denotes an objective lens driving device provided with the objective lens 1 so as to face the optical disk D, 22 denotes an optical pickup device, and the optical pickup device 22 includes a light source 23, a collimating lens 24, a beam splitter. 25, an optical system 30 including a rising mirror 26, a condenser lens 27, a cylindrical lens 28, and a light receiving element 29 is provided.

  The diffused light emitted from the light source 23 mounted on the optical pickup device 22 is made into substantially parallel light by the collimating lens 24, and then passes through the beam splitter 25 and is deflected by the rising mirror 26. The parallel light deflected by the rising mirror 26 is incident on the objective lens 1 of the objective lens driving device 21 mounted on the optical pickup device 22 and condensed to form a spot S on the optical disc D. The reflected light of the spot S is changed in direction and direction by the beam splitter 25, passes through the condenser lens 27 and the cylindrical lens 28, and then enters the light receiving element 29.

  The optical system is configured such that the reflected light of the spot S on the optical disc D is incident on the light receiving element 29, and based on the signal obtained by photoelectric conversion by the light receiving element 29, the focusing coil of the objective lens driving device 21, By driving the tracking coil to cause the objective lens 1 to follow the optical disc D, proper recording / reproduction with respect to the optical disc D is performed.

  Since the objective lens driving device 21 mounted on the optical pickup device 22 includes the objective lens driving device capable of tilt correction described in the first and second embodiments of the objective lens driving device, a good signal is output. The obtained optical pickup device can be provided.

  In addition, since the objective lens driving device has a small dimension in the focusing direction as in the configuration described in the first and second embodiments of the objective lens driving device, the entire optical pickup device can be configured to be thin. .

  FIG. 10 is a perspective view showing a second embodiment of an optical pickup device equipped with an objective lens driving device in which a rod-like elastic support member (wire spring 7, rod-like plate spring 11) is offset as shown in FIG. The objective lens driving device 21 and the optical system 30 as shown in FIG. 9 are installed at a position overlapping in the focusing direction by causing the light beam L emitted from the light source 23 to enter from the side surface in the tracking direction of the unit. This makes it possible to provide an optical pickup device that can be further reduced in thickness.

  However, in the configuration of Embodiment 2 shown in FIG. 10, the base 5 of the objective lens driving device 21 is installed upside down from the configuration of the objective lens driving device shown in FIG. 8 so as not to block the light beam L. Yes.

  11 is a plan view showing a schematic configuration of Embodiment 1 of the optical disk apparatus capable of mounting the optical pickup apparatus shown in FIGS. 9 and 10 according to the present invention, and FIG. 12 is a side view of the optical disk apparatus of FIG. In the following description, members corresponding to those of the optical pickup device described with reference to FIG.

  In FIG. 11, 31 is an optical disk device, 32 is an anti-vibration rubber installed between a base 33 that supports the optical pickup device 22 and the lower surface of the housing of the optical disk device 31, and 34 is a spindle motor that rotationally drives the optical disk D. , 35 are seek rails for guiding the optical pickup device 22 in the seek direction by driving a seek motor (not shown).

  The optical pickup device 22 mounted on the optical disk device of the first embodiment shown in FIGS. 11 and 12 maintains a good spot S and is good as described in the embodiments shown in FIGS. Since the optical pickup device can obtain a signal, an optical disc device having excellent recording / reproducing performance can be provided. In addition, since the optical pickup apparatus described with reference to FIGS. 9 and 10 has a small dimension in the focusing direction, the entire optical disk apparatus can be configured to be thin.

  FIG. 13 is a perspective view showing Embodiment 2 of the optical disk device on which the objective lens driving device 21 having a configuration in which the rod-like elastic support members (wire spring 7 and rod-like plate spring 11) are offset as shown in FIG. 8, and FIG. It is a perspective view which shows the principal part of the optical disk apparatus of FIG.

  13 and 14, the structure is such that the bar-shaped leaf spring 11 disposed near the optical disk in the focusing direction and disposed on the inner peripheral side of the movable part is short, so that the optical pickup device 22 is positioned at the innermost inner periphery of the disk. In this case, it is possible to prevent the spindle motor 34 from interfering with the turntable 36 (the portion A in FIG. 14 is a portion where interference is likely to occur in a normal configuration).

  It should be noted that the configurations of the above-described embodiments of the objective lens driving device, the optical pickup device, and the optical disc device can be implemented in appropriate combination.

  The present invention is applied to a three-axis driving objective lens driving device used in a recording / reproducing apparatus for various optical disks which are optical recording media such as CDs and DVDs, and an optical pickup device and optical disk equipped with the objective lens driving device. It is effective to implement on the device.

The perspective view of the objective lens drive device for demonstrating Embodiment 1 of this invention Partial sectional view of the objective lens driving device of Embodiment 1 The perspective view which shows the modification 1 of Embodiment 1. FIG. The perspective view which shows the modification 2 of Embodiment 1. FIG. The perspective view of the objective-lens drive device for describing Embodiment 2 of this invention Partial sectional drawing of the objective lens drive device of Embodiment 2 The perspective view for demonstrating the manufacturing method of the rod-shaped leaf | plate spring of Embodiment 2. FIG. The perspective view which shows the modification 1 of Embodiment 2. FIG. 1 is a schematic configuration diagram of Embodiment 1 of an optical pickup device equipped with an objective lens driving device according to the present invention. Embodiment 2 of an optical pickup device equipped with an objective lens driving device having a configuration in which a rod-like elastic support member is offset as shown in FIG. 9 is a plan view showing a schematic configuration of Embodiment 1 of an optical disc apparatus capable of mounting the optical pickup device shown in FIGS. 9 and 10 according to the present invention. FIG. Side view of the optical disk apparatus of FIG. FIG. 8 is a perspective view showing a second embodiment of an optical disc apparatus equipped with an objective lens driving device having a configuration in which a rod-like elastic support member is offset as shown in FIG. The perspective view which shows the principal part of the optical disk apparatus of FIG. A perspective view showing a conventional example of an objective lens driving device capable of tilt driving The perspective view which shows the other conventional example of the objective lens drive device in which a tilt drive is possible The perspective view for demonstrating the manufacturing method of a rod-shaped leaf | plate spring

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Objective lens 2 Objective lens holding member 3 Drive coil 4 Relay board 5 Base 6 Drive magnet 7 Wire spring 8 Fixing member 10 Protruding part 11 Bar-shaped leaf spring 12 Plate material 21 Objective lens drive device 22 Optical pickup device 23 Light source 24 Collimating lens 25 Beam Splitter 26 Rising mirror 27 Condensing lens 28 Cylindrical lens 29 Light receiving element 30 Optical system 31 Optical disk device 32 Anti-vibration rubber 33 Base 34 Spindle motor 35 Seek rail 36 Turntable P1 First plane P2 Second plane S1 First Side S2 Second side

Claims (11)

An objective lens for condensing a light beam on an optical disc, an objective lens holding member for holding the objective lens, an electromagnetic drive member for driving the objective lens holding member in a focusing direction and a tracking direction, and the objective lens holding member. In the objective lens driving device composed of a rod-like elastic support member that is movably supported with respect to the fixed portion,
Three rod-like elastic support members are arranged on the first plane and the second plane perpendicular to the focusing direction, each having a substantially tangential direction as a longitudinal direction, and the rod-like elastic support members on the first plane are arranged. Two support members are disposed on the first side surface side in the tracking direction of the objective lens holding member, and one support member is disposed on the second side surface opposite to the first side surface, and the second side member is disposed. 1. The objective lens driving device according to claim 1, wherein one rod-like elastic support member on a plane is arranged on the first side surface side and two on the second side surface side.   The two bar-shaped elastic support members are formed to be narrower than the one bar-shaped elastic support member, and the two bar-shaped elastic support members are substantially the same as one bar-shaped elastic support member. 2. The objective lens driving device according to claim 1, wherein the objective lens driving device is set to have an equivalent spring constant.   The two rod-like elastic support members are formed longer than the one rod-like elastic support member, and the two rod-like elastic support members are substantially equivalent to one spring constant. The objective lens driving apparatus according to claim 1, wherein the objective lens driving apparatus is configured to have   A relay substrate attached to the first side surface and the second side surface of the objective lens holding member at the end portion on the objective lens holding member side of the two rod-shaped elastic support members arranged. The objective lens driving device according to claim 1, wherein the objective lens driving device is fixed on both sides by being sandwiched.   The rod-like elastic support members of the two arranged portions are arranged so as to be inclined so that the interval between the end portions on the fixed portion side is wider than the interval between the end portions on the objective lens holding member side. The objective lens driving device according to any one of claims 1 to 4.   The rod-shaped elastic support member is a plate-like body, and an end portion of the plate-like body is integrally embedded in at least one of the objective lens holding member and the fixed portion. The objective lens driving device according to Item.   7. A method for forming a rod-like elastic support member according to claim 6, wherein two wide leaf spring members perpendicular to the focusing direction are integrally formed on at least one of the objective lens holding member and the fixed portion, and unnecessary portions are formed. A method for forming an elastic support member for an objective lens driving device, wherein a plurality of narrow plate-like bodies are formed to remove the slab, thereby forming the rod-like elastic support member.   A light comprising: a light source that emits irradiation light to an optical disk; a light receiving optical system that receives reflected light from the optical disk; and the objective lens driving device according to claim 1. Pickup device.   2. A first plane and a second plane perpendicular to the focusing direction according to claim 1, comprising: a light source that emits irradiation light to the optical disc; and a light receiving optical system that receives reflected light from the optical disc. 4. The first side surface according to claim 1, wherein the first plane is set closer to the optical disc side than the second plane in the focusing direction and overlaps with the second plane in the focusing direction. An optical pickup device in which a light beam is incident on the objective lens driving device from the light source.   An optical disc apparatus comprising: a rotary drive member that rotationally drives the optical disc; and the optical pickup device according to claim 8, which is provided so as to be movable in a radial direction of the optical disc.   The first and second planes perpendicular to the focusing direction according to claim 1, comprising: a rotation driving member that rotationally drives the optical disk; and an optical pickup device that is movably provided in a radial direction of the optical disk. The objective lens according to claim 3, wherein the first plane is set closer to the optical disc side than the second plane in the focusing direction, and the second side surface according to claim 1 is an inner peripheral side of the optical disc. An optical disc apparatus comprising a drive device.

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