JP2007257724A - Disk driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-speed and compact disk device by facilitating heat emission from a spindle motor and effectively cooling down electronic components being signal writing/reading means. <P>SOLUTION: The device is provided with: a box type case body; a mechanical base 11 installed inside the case body; a mechanical chassis 12 mounted inside the mechanical base 11; a spindle motor 13 for disk rotation driving and pick-up 14 for data recording/reproducing provided for the mechanical chassis 12; a disk tray 17 for moving on a guide provided for the mechanical base 11 by motor operation; and a circuit substrate 19 positioned at a lower part of the mechanical base 11. The spindle motor 13 is fixed to the mechanical chassis 12 via an installation plate 27 and, for the installation plate 27, a heat emission material having high heat emission rate and excellent in heat emission is used. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a disk drive device.

  A storage device (hereinafter referred to as a disk device) having a structure for rotationally driving a disk-shaped disk writes (records) data on the disk surface of the disk while rotating the disk-shaped disk as a data recording medium. At the same time, the data recorded on the disk surface of the disk is read (reproduced).

The disk device is equipped with electronic components including a laser light source and a laser light receiving unit as signal writing and reading means for recording and reproducing data. When this disk device is, for example, an optical disk device, the electronic component is generally called an optical pickup or simply a pickup. When the disk device is a magnetic disk device, for example, the electronic component is generally called a header. As a disk that is a data recording medium, in the case of an optical disk device, for example, a CD-ROM, a CD-R, a CD-RW,
DVD-ROM, DVD-R, DVD-RW, DVD-RAM, DVD + R, DVD +
RW etc. are mentioned. As shown in FIG. 9, the disk device is generally an electronic device 71 having a central processing unit (CPU) for controlling access to the disk device 72 and performing arithmetic processing.
(For example, a personal computer).

  Currently, such disk devices tend to increase the recording and reproduction speed. As the speed is increased, the rotational speed of the spindle motor for driving the disk rotation increases, so the amount of heat generated from the spindle motor further increases, and the air temperature inside the disk device increases significantly. As a result, the temperature of electronic components such as pickups also becomes high, and the problem that the performance of the disk device deteriorates has become apparent.

  As a countermeasure, for example, in Japanese Patent Laid-Open No. 2002-15547, a blade is provided in the rotor and a groove is formed in the turntable to induce an air flow due to disk rotation. A method for suppressing the temperature increase of the spindle motor has been proposed.

JP 2002-15547 A

  In the future, in such a disk device, further miniaturization is demanded as well as high speed, and as a result, heat generated from the spindle motor is easily transferred to the pickup by heat conduction through components such as a mechanical chassis, Equipment performance will be significantly reduced.

  In general, in a spindle motor such as a brushless motor, the most heat generating portion is a motor coil. However, since a magnet is provided in the vicinity of the motor coil, the rotation characteristics of the spindle motor are not deteriorated in achieving downsizing of the apparatus. Therefore, it is necessary to prevent the heat generated from the motor coil from being transmitted to the magnet side as much as possible.

  However, as disclosed in Japanese Patent Application Laid-Open No. 2002-15547, the rotor is provided with blades and grooves are formed in the turntable to induce an air flow by rotating the disk, and the air flow is a recording medium. Although there is a means for suppressing the temperature rise of the disk and the spindle motor, this means does not necessarily satisfy the temperature rise suppression of the spindle motor.

  An object of the present invention is to provide a disk drive device that suppresses a temperature increase of a spindle motor.

  The purpose is to provide a mechanical base installed inside a box-shaped housing, a mechanical chassis mounted in the mechanical base, a spindle motor for driving the disk rotation provided in the mechanical chassis, and a pickup for recording and reproducing data. And a disk tray that moves by driving a motor on a guide provided on the mechanical base, and a circuit board that is positioned below the mechanical base, the spindle motor being fixed to the mechanical chassis by a mounting plate, This is achieved by applying a treatment for increasing the emissivity to the surface of the mounting plate.

  The above object is achieved by applying a heat radiation paint having a high emissivity to the mounting plate of the spindle motor.

  The above object is achieved by attaching a heat radiation sheet having a high emissivity to the mounting plate of the spindle motor.

  The above object is achieved by the fact that the spindle motor mounting plate is a heat radiating member having a high emissivity.

  ADVANTAGE OF THE INVENTION According to this invention, the disk drive device which suppressed the temperature rise of a spindle motor can be provided.

First, a typical structure of the disk device will be described with reference to FIGS.
FIG. 6 is a perspective view showing a schematic internal configuration of the apparatus.
FIG. 7 is a cross-sectional view showing a schematic internal configuration of the apparatus.
6 and 7, a mechanical chassis 52 is mounted in a mechanical base 51 installed in a box-shaped housing. The mechanical chassis 52 has a spindle motor 53 for driving a disk and light for data recording and reproduction. A moving means (not shown) for moving the pickup 54 and the optical pickup along the two bar-shaped guide bars 55 is provided. For example, a brushless motor is often used as the spindle motor 53, and the spindle motor 53 is fixed to the mechanical chassis 52 via a mounting plate 67.

A disk tray 57 for storing the optical disk 56 in the disk apparatus and taking out the optical disk 56 from the disk apparatus moves on a guide (not shown) provided on the mechanical base 51 by driving a motor (not shown). .

  A circuit board 59 is located below the mechanical base 51, and the entire mechanical base 51 is surrounded by a top cover 60, a bottom cover 61, and a front panel 58 to form a box-shaped casing. Here, the circuit board 59 is fixed substantially parallel to the bottom cover 61 with an interval of a certain size, and the main heating element 62 mounted on the circuit board 59 has a high thermal conductivity. The heat conduction member 63 is attached, and heat generated from the heating element 62 is transmitted to the bottom cover 61 through the heat conduction member 63 and is radiated from the bottom cover 61 to the outside air.

Further, a rotor 64 for fixing the optical disk 56 to the turntable 66 on the spindle motor 53 is provided at a location facing the spindle motor 53 of the top cover 60 by a support member 65 for supporting the rotor 64. Yes. The turntable 66 incorporates a permanent magnet for fixing the rotor 64 to the turntable 66. When the apparatus is driven, the optical disk 56 is sandwiched between the turntable 66 and the rotor 64, and the optical disk 56 is rotated by rotating the spindle motor 53 at a high speed in this state.

  In this way, the turntable 66, the spindle motor 53 for rotating the turntable 66, and the rotor 64 for magnetically fixing the optical disk 56 on the turntable 66 constitute a disk rotation driving means. .

  In the future, such disk devices are required to be further miniaturized with higher speeds. As a result, as shown by the arrows in FIG. 8, the heat generated from the spindle motor is conducted through the components such as the mechanical chassis. As a result, it is easily transmitted to the pickup and the performance of the apparatus is remarkably deteriorated.

  Accordingly, the inventors of the present invention have made various studies on the suppression of the temperature rise of the spindle motor and, as a result, obtained the following examples.

A case where the present invention is applied to an optical disc apparatus as an embodiment of the present invention will be described below.
FIG. 1 is a cross-sectional view showing a schematic internal configuration of an optical disk apparatus to which the first embodiment is applied.
FIG. 2 is a cross-sectional view showing a schematic internal configuration of an optical disc apparatus to which the second embodiment is applied.
FIG. 3 is a schematic sectional view of a spindle motor for driving the disk rotation of the optical disk apparatus to which the first embodiment is applied.
FIG. 4 is a schematic sectional view of a spindle motor for driving the disk rotation of the optical disk apparatus to which the second embodiment is applied.
FIG. 5 is a schematic explanatory view showing a heat radiation path of a disk rotation driving spindle motor of an optical disk apparatus to which an embodiment of the present invention is applied.
In FIG. 1, FIG. 3, and FIG. 5, a mechanical chassis 12 is mounted in a mechanical base 11 housed in a box-shaped housing. The mechanical chassis 12 includes a spindle motor 13 for rotationally driving a disk-shaped optical disk 16, an optical pickup 14 for writing data on the disk surface of the optical disk 16, or reading data written on the disk surface, and two optical pickups 14. And a moving means (not shown) for moving along the bar-shaped guide bar. The spindle motor 13 is fixed to the mechanical chassis 12 via a mounting plate 27.

  A disc tray 17 for storing the optical disc 16 in the disc device and taking out the optical disc 16 from the disc device moves on a guide provided on the mechanical base 11 by driving a motor (not shown).

  A circuit board 19 is positioned below the mechanical base 11, and the entire mechanical base 11 is surrounded by a top cover 20, a bottom cover 21, and a front panel 18 to form a box-shaped housing.

  The circuit board 19 is fixed substantially parallel to the bottom cover 21 with an interval of a certain size, and the main heating element 22 mounted on the circuit board 19 has high thermal conductivity. A heat conductive member 23 is attached, and heat generated from the heating element 22 is transmitted to the bottom cover 21 through the heat conductive member 23.

Further, a rotor 24 for fixing the optical disk 16 to the turntable 26 on the spindle motor 13 is provided at a position facing the spindle motor 13 of the top cover 20 by a support member 25 for supporting the rotor 24. ing. The turntable 26 incorporates a permanent magnet 34 (shown in FIG. 3) for fixing the rotor 24. When the apparatus is driven, the optical disk 16 is sandwiched between the turntable 26 and the rotor 24. In this state, the optical disk 16 is rotated by driving the spindle motor 13 to rotate at a high speed. Thus, the disk rotation driving means is constituted by the turntable 26, the spindle motor 13 for rotationally driving the turntable 26, and the rotor 24 for magnetically fixing the optical disk 16 on the turntable 26. Is done.

  Here, the surface of the mounting plate 27 of the spindle motor 13 for driving the disk rotation is subjected to a process for increasing the emissivity of the surface. In the first embodiment, the treatment may be application of a heat radiation paint 28 having a high emissivity, application of a heat radiation sheet 28 having a high emissivity, and blackening 28 of the surface.

  By doing so, it is possible to suppress the heat generated from the motor coil 33 inside the spindle motor 13 from being transmitted to the magnet 30 side when the spindle motor 13 is driven to rotate at high speed, thereby preventing the rotation characteristics of the spindle motor 13 from deteriorating. In addition, the heat can be effectively radiated from the mounting plate 27 to the bottom cover 21 which is a part of the apparatus housing by radiant heat transfer (indicated by an arrow in FIG. 5). That is, since the heat from the spindle motor 13 can be radiated to the lower side (bottom cover 21 side) of the spindle motor 13 without transferring it to the optical pickup 14 side, the temperature of the electronic components such as the optical pickup 14 is greatly increased. Can be lowered.

  2 and 4, the optical disk apparatus of the first embodiment uses a member 36 having a high emissivity and excellent radiation heat dissipation for the mounting plate itself of the spindle motor 13 for driving the disk rotation. By doing so, it is possible to suppress the heat generated from the motor coil 33 inside the spindle motor 13 from being transmitted to the magnet 30 side when the spindle motor 13 is driven to rotate at a high speed, so that the rotational characteristics of the spindle motor 13 are deteriorated. In addition to being able to prevent, heat can be effectively radiated from the mounting plate (heat radiating member) 36 to the bottom cover 21 which is a part of the apparatus housing by radiant heat transfer.

  That is, since the heat from the spindle motor 13 can be radiated to the lower side (bottom cover 21 side) of the spindle motor 13 without transferring it to the optical pickup 14 side, the temperature of the electronic components such as the optical pickup 14 is greatly increased. Can be lowered.

  The optical disk apparatus has been described above as the disk apparatus to which the present invention is applied. However, the disk apparatus is not limited to the optical disk apparatus, and may be a magnetic disk apparatus. Furthermore, the electronic device on which the disk device to which the present invention is applied is not limited to a personal computer, but may be an in-vehicle computer such as a hard disk recorder or a car navigation system, a game computer, or the like.

  FIG. 9 is a schematic configuration diagram when the disk device is mounted on an electronic device.

  As described above, according to the present invention, by radiating and radiating the spindle motor for driving the disk rotation, it is possible to effectively cool electronic components such as the signal writing and reading means such as the pickup, and as a result, the disk device. Recording / reproducing speed and device size can be reduced.

1 is a cross-sectional view showing a schematic internal configuration of a disk device to which a first embodiment of the present invention is applied. It is the cross-sectional view which showed schematic internal structure of the disc apparatus formed by applying the 2nd Example of this invention. 1 is a schematic sectional view of a spindle motor for driving disk rotation in a disk device to which a first embodiment of the present invention is applied. FIG. 5 is a schematic cross-sectional view of a spindle motor for driving disk rotation in a disk device to which a second embodiment of the present invention is applied. 1 is a schematic explanatory diagram showing a heat dissipation path of a spindle motor for driving a disk rotation in a disk device to which an embodiment of the present invention is applied. FIG. It is the perspective view which showed the schematic internal structure of the conventional disk apparatus. It is a cross-sectional view showing a schematic internal configuration of a conventional disk device. It is the schematic explanatory drawing which showed the thermal radiation path | route of the spindle motor of the conventional disc apparatus. It is explanatory drawing which showed schematic structure at the time of mounting a disc apparatus in an electronic device.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11, 51 ... Mechanical base, 12, 52 ... Mechanical chassis, 13, 53 ... Spindle motor, 14, 54 ... Optical pick-up, 16, 56 ... Optical disc, 17, 57 ... Disc tray, 18, 58 ... Front panel, 19, 29 , 59 ... Circuit board, 20, 60 ... Top cover, 21, 61 ... Bottom cover, 22, 62 ... Heat generating element, 23, 63 ... Heat conduction member, 24, 64 ... Rotor, 25, 65 ... Support member, 26 , 66 ... Turntable, 27, 67 ... Mounting plate, 28 ... Heat dissipation material, 30, 34 ... Magnet, 31 ... Stator core, 32 ... Rotor, 33 ... Motor coil, 35 ... Shaft, 36 ... Heat dissipation member, 55 ... Guide bar 71 ... Electronic equipment, 72 ... Disk device.

Claims (5)

A mechanical base installed in a box-shaped housing, a mechanical chassis mounted in the mechanical base, a spindle motor for driving a disk rotation and a pickup for data recording / reproduction provided in the mechanical chassis, and the mechanical base A disc tray that is moved by a motor drive on a guide provided on the circuit board, and a circuit board that is positioned below the mechanical base,
The disk drive device according to claim 1, wherein the spindle motor is fixed to the mechanical chassis by a mounting plate, and the surface of the mounting plate is subjected to a process for increasing the emissivity. The disk drive apparatus according to claim 1, wherein
A disk drive device characterized in that a heat radiation paint having a high emissivity is applied to a mounting plate of the spindle motor. The disk drive apparatus according to claim 1, wherein
A disk drive device, wherein a heat radiation sheet having a high emissivity is attached to a mounting plate of the spindle motor. The disk drive apparatus according to claim 1, wherein
The disk drive apparatus according to claim 1, wherein the spindle motor mounting plate is a heat radiating member having a high emissivity. An electronic apparatus equipped with the disk drive device according to any one of claims 1 to 4.

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