JP2010165396A - Guide shaft supporting device of optical disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide shaft supporting device provided for guiding movement operation of an optical pickup device. <P>SOLUTION: In the guide shaft supporting device, bearings 25, 26 rotatably supporting the rotary shaft 21 of a spindle motor 3 rotating a turntable 20 are fixed, and a first supporting member 14 and a second supporting member 18 regulating fixing positions of a main guide shaft 13 and a sub-guide shaft 17 which are provided for moving the optical pickup device in the radial direction of an optical device are integrally formed at a motor base plate 2 constituting the spindle motor 3. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a support device for a guide shaft that guides a reading operation of a signal recorded on an optical disc by a laser beam and a moving operation of an optical pickup device that performs a signal recording operation on the optical disc.

  2. Description of the Related Art Optical disk apparatuses that can perform signal reading operation and signal recording operation by irradiating a signal recording layer of an optical disk with laser light emitted from an optical pickup device have become widespread.

  As an optical disk apparatus, an apparatus using an optical disk called a CD or a DVD is generally popular. Recently, an apparatus using an optical disk called a Blu-ray standard with improved recording density has been developed.

  The optical pickup device incorporated in the optical disk apparatus is configured to be moved in the radial direction of the optical disk by the rotational driving force of the pickup feeding motor. Such an optical pickup device needs to accurately read a signal recorded on the optical disc, and therefore needs to accurately move the optical disc in the radial direction, and is generally fixed to a fixed substrate. The moving operation is guided by a pair of guide shafts.

Japanese Patent Laid-Open No. 11-66767

  As described above, there are optical disc apparatuses in which an optical pickup device is incorporated that use various optical discs such as a CD standard, a DVD standard, and a Blu-ray standard. There are various types of such optical disk devices such as a stationary type and those incorporated in a computer device.

  Personal computers, particularly notebook computers, have been reduced in thickness, and optical disk devices incorporated in such computers have also been reduced in thickness. When the optical disk device is made thinner, the optical pickup device incorporated therein is also required to be made thinner.

  Recently, a Blu-ray standard optical disc apparatus capable of performing a high-density recording operation is spreading. However, an optical pickup device incorporated in such an optical disc apparatus is not only required to have its own accuracy. The movement accuracy of the drive mechanism that performs the displacement operation in the radial direction is required.

The optical pickup device described in the above-mentioned patent document is configured so that the movement operation in the radial direction of the optical disk is guided by the main shaft and the sub shaft. However, since the shaft described in the prior art is fixed to the mechanical chassis, that is, it is fixed to a chassis different from the base of the spindle motor that rotationally drives the turntable on which the optical disk is placed. In order to perform a high movement operation, it is necessary to make adjustments to obtain the best positional relationship between the spindle motor that rotates the turntable and the shaft, and there is a problem in that the number of assembly work steps increases.

  The present invention seeks to provide a guide shaft support device that can solve such problems.

  According to the present invention, a turntable is mounted on a turntable by a main guide shaft having a circular cross section and a sub guide shaft inserted in a U-shaped groove provided in the optical pickup device. The optical pickup device is configured to move in the radial direction of the optical disk placed on the optical disk, and the spindle motor is configured while the bearing for rotatably supporting the rotation shaft of the spindle motor that rotationally drives the turntable is fixed. A first support member and a second support member that support one ends of the main guide shaft and the sub guide shaft are integrally formed on the motor substrate.

  Further, the present invention is characterized in that the first support member and the second support member are respectively provided with a side surface position restricting portion that contacts the side surfaces of the main guide shaft and the sub guide shaft and a lower surface position restricting portion that contacts the lower surface. Is.

  The present invention is characterized in that the first support member and the second support member are each formed with two side surface position restricting portions that come into contact with both side surfaces of the main guide shaft and the sub guide shaft.

  Furthermore, the present invention is characterized in that a lower surface position restricting portion that contacts the lower surfaces of the main guide shaft and the sub guide shaft is formed on the first support member and the second support member, respectively.

  The present invention is characterized in that circular holes into which the main guide shaft and the sub guide shaft are inserted are formed in the first support member and the second support member, respectively.

  The present invention is characterized in that the first support member and the second support member are formed by pressing the motor substrate.

  The guide shaft support device according to the present invention is inserted into a guide hole provided in the optical pickup device, and is inserted into a main guide shaft having a circular cross section and a U-shaped groove provided in the optical pickup device. The optical pickup device is configured to move in the radial direction of the optical disk placed on the turntable by a shaft, and a bearing that rotatably supports a rotating shaft of a spindle motor that rotationally drives the turntable is fixed. In addition, since the first support member and the second support member that support one ends of the main guide shaft and the sub guide shaft are integrally formed on the motor board that constitutes the spindle motor, that is, the spindle motor that is the rotation shaft of the turntable. The movement of the optical pickup device is guided by the motor board to which the bearing that supports the rotating shaft is fixed. Since so as to regulate the position of the main guide shaft and the sub guide shaft determining the position of the optical pickup device as well as, it is possible to accurately set the positional relationship between the turntable and the optical pickup device.

  The guide shaft support device of the present invention can accurately set the inclination of the main guide shaft and the sub guide shaft for guiding the moving operation of the optical pickup device with respect to the turntable, so that it is placed on the turntable and driven to rotate. There is an advantage that the positional relationship between the optical disc and the optical pickup device whose displacement position is regulated by the both guide shafts, particularly the positional relationship in the tangential direction, can be set accurately.

  According to the guide shaft support device of the present invention, the position of the turntable and the optical pickup device can be obtained by a simple configuration in which the first support member and the second support member for restricting the positions of the main guide shaft and the sub guide shaft are provided on the motor board. Since the positional relationship can be in the best state, adjustment work during assembly work is not necessary, and the present invention has a great effect in reducing the manufacturing cost.

  In the guide shaft support device of the present invention, since the first support member and the second support member are formed on the motor substrate by pressing the motor substrate, the turntable is improved by increasing the accuracy of the press processing. It is possible to accurately set the positional relationship between the main guide shaft and the sub guide shaft.

  In the guide shaft support device of the present invention, the motor substrate is fixed because the motor substrate constituting the spindle motor is provided with the first support member and the second support member that support one end of the main guide shaft and the sub guide shaft. As compared with the case where the support member is formed on a substrate or the like, there is an advantage that it is easy to reduce the thickness.

It is principal part sectional drawing which concerns on Example 1 of the guide shaft support apparatus of this invention. It is a perspective view of the principal part which concerns on Example 1 of the guide shaft support apparatus of this invention. It is a perspective view of the principal part which concerns on Example 1 of the guide shaft support apparatus of this invention. It is a front view of the principal part which concerns on Example 2 of the guide shaft support apparatus of this invention. It is a front view of the principal part which concerns on Example 3 of the guide shaft support apparatus of this invention. It is a front view of the principal part which concerns on Example 4 of the guide shaft support apparatus of this invention.

  Hereinafter, a guide shaft support device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In FIG. 2, reference numeral 1 denotes a fixed substrate constituting the optical disk apparatus, and 2 denotes a motor substrate constituting a spindle motor 3 described later, which is fixed to the fixed substrate 1 by screws 4, 5, 6 (see FIG. 3). It is configured.

  7 is an optical pickup device incorporating an objective lens 8 for condensing laser light on the signal surface of the optical disk and an optical component for guiding the laser light emitted from the laser diode to the objective lens 8, and has a circular guide hole. A main support arm 10 in which 9 is formed and a sub-support arm 12 in which a U-shaped groove 11 is formed are provided.

  Reference numeral 13 denotes a main guide shaft which is inserted into a guide hole 9 formed in the main support arm 10 of the optical pickup device and has a circular cross section, and one end 13A is formed integrally with the motor substrate 2. The position is regulated by the first support member 14, and the other end 13 </ b> B is fixed by a fixing member (not shown) formed on the fixed substrate 1. Reference numeral 15 denotes a main guide shaft fixing member fixed to the fixed substrate 1 by screws 16, and a plate spring 15 </ b> A for pressing and urging one end 13 </ b> A of the main guide shaft 13 is formed.

Reference numeral 17 denotes a sub guide shaft that is inserted into the U-shaped groove 11 formed in the sub support arm 12 of the optical pickup device, and one end 17A is a second support member 18 that is formed integrally with the motor substrate 2. The other end 13 </ b> B is fixed by a fixing member (not shown) formed on the fixed substrate 1. Reference numeral 19 denotes a sub guide shaft fixing member fixed to the fixed substrate 1 by screws 20, and one end 17 of the sub guide shaft 17.
A leaf spring 19A that presses and biases A is formed.

  Reference numeral 20 denotes a turntable fitted to a rotary shaft 21 constituting the spindle motor 3, and is configured to rotate with the rotary shaft 21 and to place an optical disc. Reference numeral 22 denotes a centering member that is fitted and fixed to the upper end of the rotary shaft 21, and has a function of fitting the center hole formed in the center portion of the optical disc to position the optical disc.

  As described above, the optical disc apparatus according to the present invention is configured, and in such a configuration, the optical pickup device 7 has a diameter of an optical disc placed on the turntable 20 by the main guide shaft 13 and the sub guide shaft 17. It is configured to move in the direction, that is, in the directions of arrows A and B. Further, the movement operation in the radial direction of the optical pickup device 7 is performed by rotating the driving arm portion 10A provided by extending the main support arm 10 by the rotational driving force of an optical pickup driving motor (not shown). It is configured to perform by driving.

  As a driving method of the driving arm portion 10A, a rack gear is formed on the driving arm portion 10A, and a gear that meshes with the rack gear is rotated by an optical pickup driving motor, or a feed groove is formed on the periphery. It is well known that the driving arm 10A is formed with an engaging portion that rotationally drives the feeding shaft and engages with the feeding groove, and the rotational force of the feeding shaft is transmitted to the driving arm portion 10A. Therefore, the description thereof is omitted.

  As described above, the guide shaft support device according to the present invention is configured. Next, the gist of the present invention will be described with reference to FIG.

  In FIG. 1, reference numeral 23 denotes a rotation shaft support member fixed to a rotation support recess 2A formed on the motor substrate 2, and a drive coil 24 to which a drive current is supplied when the rotation shaft 21 is rotated is fixed. Has been. Reference numerals 25 and 26 denote bearings fixed to the rotary shaft support member 23 and have a function of rotatably supporting the rotary shaft 21 of the spindle motor 3.

  Reference numeral 27 denotes a rotor fitted and fixed to the rotary shaft 21 so as to rotate integrally with the rotary shaft 21, and a ring-shaped magnet 28 is bonded and fixed to the side wall of the inner surface. As described above, the spindle motor 3 includes the motor board 2, the rotary shaft 21, the rotary shaft support member 23, the drive coil 24, the bearings 25 and 26, the rotor 27, and the magnet 28.

  In the spindle motor 3 having such a configuration, when a drive signal is supplied to the drive coil 24 from a motor drive circuit incorporated in the motor board 2 or the like, a magnetic force induced from the drive coil 24 and a magnet 28 are generated. Since the rotational force with respect to the rotor 27 is generated by the generated magnetic force, the rotor 27 rotates about the rotation shaft 21.

  When the rotating shaft 21 is rotated by the rotational driving force generated in the rotor 27, the turntable 20 fitted and fixed to the rotating shaft 21 is rotated, so that the optical disk placed on the turntable 20 is rotated. I can do it. The rotational speed of the optical disk can be controlled to a desired rotational speed by controlling the magnitude of the drive signal supplied to the drive coil 24, the interval between drive pulses, and the like.

According to such a configuration, the position of the turntable 20 is determined by the bearings 25 and 26 fixed to the rotation support member 23 fixed to the rotation support recess 2 </ b> A formed on the motor substrate 2. On the other hand, the main guide shaft 13 and the sub guide shaft 17 that position the optical pickup device 7 are positioned by the first support member 14 and the second support member 18 that are integrally formed on the motor substrate 2 as described above. It is configured to be regulated.

  As shown in FIG. 1, the first support member 14 includes a side surface position restricting portion 14 </ b> A that contacts the side surface of the main guide shaft 13 and a lower surface position restricting portion 14 </ b> B that contacts the lower surface of the main guide shaft 13. . One end 13A of the main guide shaft 13 is pressed and urged in the direction of arrow C by the leaf spring 15A formed on the main guide shaft fixing member 15 as described above.

  Accordingly, the horizontal position of the main guide shaft 13 in the direction of the rotation shaft 21 of the spindle motor 3 is restricted by the side surface position restricting portion 14A of the first support member 14, and the axial direction of the rotation shaft 21, that is, the vertical position is The lower surface position restricting portion 14B of the first support member 14 is restricted. Thus, the horizontal position and the vertical position of the main guide shaft 13 are determined by the first support member 14.

  Since the first support member 14 that regulates the horizontal and vertical positions of the main guide shaft 13 is formed integrally with the motor substrate 2 constituting the spindle motor 3, the first support member 14 is formed with respect to the rotation shaft 21 of the spindle motor 3. The positional relationship of the main guide shaft 13 can be set with high accuracy. That is, the optical pickup device 7 whose movement position is regulated by the main guide shaft 13 and the optical disk placed on the turntable 20 that is rotationally driven by the rotary shaft 21 are configured to be in the best state. I can do it.

  As described above, positioning of the main guide shaft 13 by the first support member 14 is performed. Next, positioning of the sub guide shaft 17 will be described. As shown in FIG. 1, the second support member 18 that positions the sub guide shaft 17 includes a side surface position restricting portion 18 </ b> A that contacts the side surface of the sub guide shaft 17 and a lower surface position control that contacts the lower surface of the sub guide shaft 17. It is comprised from the part 18B. One end 17A of the sub guide shaft 17 is pressed and urged in the direction of arrow D by the leaf spring 19A formed on the sub guide shaft fixing member 19 as described above.

  Accordingly, the horizontal position of the auxiliary guide shaft 17 in the direction of the rotation axis 21 of the spindle motor 3 is restricted by the side surface position restricting portion 18A of the second support member 18, and the axial direction of the rotation shaft 21, that is, the vertical position is The lower surface position restricting portion 18B of the second support member 18 is restricted. Thus, the horizontal position and the vertical position of the sub guide shaft 17 are determined by the second support member 18.

  Since the second support member 18 that regulates the horizontal and vertical positions of the sub guide shaft 17 is formed integrally with the motor substrate 2 constituting the spindle motor 3, the second support member 18 is formed with respect to the rotation shaft 21 of the spindle motor 3. The positional relationship of the sub guide shaft 17 can be set with high accuracy. That is, the optical pickup device 7 whose movement position is regulated by the sub guide shaft 17 and the optical disk placed on the turntable 20 that is rotationally driven by the rotary shaft 21 are configured to be in the best state. I can do it.

  As described above, the position of the main guide shaft 13 and the sub guide shaft 17 that are provided to guide the optical pickup device 7 that reads the signal recorded on the optical disc in the radial direction of the optical disc is regulated. Since the first support member 14 and the second support member 18 are formed integrally with the motor substrate 2 to which the bearings 25 and 26 for rotatably supporting the rotation shaft 21 of the spindle motor 3 are fixed, The positional relationship between the fixed turntable 20 and the optical pickup device 7 can be set accurately.

  The bearings 25 and 26 that support the first support member 14 and the second support member 18 that restrict the positions of the main guide shaft 13 and the sub guide shaft 17 so that the rotary shaft 21 of the spindle motor 3 can rotate are fixed. Since the first support member 14 and the second support member 18 are integrally formed on the same substrate because they are formed integrally with the motor substrate 2, the positional relationship between the main guide shaft 13 and the sub guide shaft 17 is determined. It can be set accurately.

  Therefore, since the horizontal inclination of the main guide shaft 13 and the sub guide shaft 17 can be set to an optimum state, the positional relationship in the tangential direction of the optical pickup device 7 with respect to the optical disc is best. It can be set to be in a state.

  In the first embodiment described above, the first support member 14 that supports the main guide shaft 13 is provided with the side surface position restricting portion 14A that restricts the horizontal position and the lower surface position restricting portion 14B that restricts the position in the vertical direction. A second embodiment of the first support member 14 shown in FIG. 4 will be described.

  As shown in FIG. 4, the first support member 14 according to the second embodiment includes first and second side surface position restricting portions 14 </ b> C and 14 </ b> D that restrict the positions in both directions that are horizontal directions, and a lower surface position restriction that restricts the lower surface position. A portion 14E is formed. According to such a configuration, since the horizontal position restriction is performed by the first support member 14, a large horizontal displacement of the main guide shaft 13 can be prevented when subjected to an impact.

  Although Example 2 of the first support member 14 is configured as shown in FIG. 4, the second support member 18 that supports the sub guide shaft 17 can be configured in the same manner, and the description thereof is omitted.

  Next, Example 3 of the first support member 14 shown in FIG. 5 will be described. As shown in FIG. 5, the first support member 14 according to the third embodiment has a circular hole 14 </ b> F into which the main guide shaft 13 is inserted. According to such a configuration, since the first support member 14 regulates the position in all directions, up, down, left, and right, large displacements in all directions of the main guide shaft 13 can be prevented when an impact is received.

  Although the third embodiment of the first support member 14 is configured as shown in FIG. 5, the second support member 18 that supports the sub guide shaft 17 can be configured in the same manner, and the description thereof is omitted.

  Next, a fourth embodiment of the first support member 14 shown in FIG. 6 will be described. As shown in FIG. 6, the support member according to the third embodiment regulates the first horizontal position regulating support member 14 </ b> G and the second horizontal position regulating support member 14 </ b> H that regulate the horizontal position, and the vertical position. It is comprised from three members of the support member 14I for an up-down direction position regulation.

  Although Example 4 of the first support member 14 is configured as shown in FIG. 6, the second support member 18 that supports the sub guide shaft 17 can also be configured in the same manner, and the description thereof is omitted.

  As described above, the first support member 14 and the second support member 18 of the present invention are integrally formed on the motor substrate 2, and a method of forming the first support member 14 and the second support member 18 will be described.

The rotation support recess 2A provided in the motor substrate 2 constituting the spindle motor 3 is formed by pressing the motor substrate 2, and the first support member 14 and the first support member 14 are formed when the press processing is performed. If the two support members 18 are simultaneously formed by pressing, the work process is simplified, and the positional relationship between the first support member 14 and the second support member 18 and the rotational shaft 21 is accurately determined. It can be set.

  The present invention can be used for an optical disk apparatus using an optical disk called CD or DVD, or an optical disk apparatus using a Blu-ray standard optical disk.

DESCRIPTION OF SYMBOLS 1 Fixed substrate 2 Motor substrate 3 Spindle motor 7 Optical pick-up apparatus 9 Guide hole 11 U-shaped groove 13 Main guide shaft 14 First support member 15 Main guide shaft fixing member 15A Leaf spring 17 Sub guide shaft 18 Second support member 19 Sub guide Shaft fixing member 20 Turntable 21 Rotating shaft 23 Rotating shaft support member 24 Drive coil 25, 26 Bearing 27 Rotor 28 Magnet

Claims (6)

It is placed on the turntable by a main guide shaft having a circular cross section and a sub guide shaft inserted through a U-shaped groove provided in the optical pickup device. An optical disk device configured to move the optical pickup device in a radial direction of the optical disk, wherein a bearing that rotatably supports a rotation shaft of a spindle motor that rotationally drives the turntable is fixed, and the spindle motor is 1. A guide shaft support device for an optical disc apparatus, wherein a first support member and a second support member that support one ends of the main guide shaft and the sub guide shaft are integrally formed on a motor substrate that constitutes the motor substrate. The first support member and the second support member are formed with a side surface position restricting portion that contacts the side surfaces of the main guide shaft and the sub guide shaft and a lower surface position restricting portion that contacts the lower surface, respectively. Guide shaft support device. 2. The guide shaft support device according to claim 1, wherein the first support member and the second support member are each formed with two side surface position restricting portions that come into contact with both side surfaces of the main guide shaft and the sub guide shaft. The guide shaft support device according to claim 3, wherein lower surface position restricting portions that contact the lower surfaces of the main guide shaft and the sub guide shaft are formed on the first support member and the second support member, respectively. The guide shaft support device according to claim 1, wherein the first support member and the second support member are formed with circular holes into which the main guide shaft and the sub guide shaft are respectively inserted. The guide shaft support device according to claim 1, wherein the first support member and the second support member are formed by pressing the motor substrate.

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