JP2005174373A - Disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk drive which can write and/or read at higher speed than when turning the disk. <P>SOLUTION: This disk drive has a disk mount section 21 to load a disk A, an optical head 3 to write and/or read the data on the disk A, and a support 4 to support this optical head 3. The support 4 can turn around the axis orthogonal to the disk mount section 21, and an electric motor 5 is provided to turn the support 4. Further, the optical head 3 can move in the direction crossing the center line of the revolution of the support 4, and a moving mechanism 6 is provided at the support 4 to move the optical head 3. Thus the optical head 3 are made to turn relative to the disk A. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a disk device such as a compact disk (CD), a digital versatile disk (DVD), a DVD writer, and a mini disk (MD).

  A disk device such as a DVD writer has an electric motor having a disk mounting portion at the end of a motor shaft, an optical head for writing and / or reading data on the disk, and a traverse operation of the optical head in the radial direction of the disk A traverse mechanism, and a support body that supports the traverse mechanism and the electric motor. The disk A is rotated by driving the electric motor, and the optical head is moved in the radial direction of the disk relative to the disk. (For example, patent document 1).

  In the disk apparatus configured as described above, a concentric recording formed on the disk surface is formed by passing a light beam modulated in accordance with data to be recorded, through an objective lens of an optical head, and condensing the light beam on a light spot. Recording is performed by projecting onto a track and forming a recording mark, which is a reverse magnetic domain, on the recording track, and collecting the reflected light from the disk surface with an objective lens and converting it to data It is playing by doing.

The disk used in the disk unit is made of a plastic plate as thin as 1.2 mm with concentric recording tracks. The center of this disk is mounted on the disk mounting part of the electric motor, and is integrated with the motor shaft. Rotate.
JP-A-4-61059

  By the way, in the disk apparatus that writes and / or reads data by rotating the disk as described above, it is necessary to rotate the disk at high speed in order to increase the writing speed. However, the disk is made of a plastic plate, and since this disk rotates, there is a problem that the disk vibrates due to warpage of the disk itself, non-uniformity due to the eccentricity of the recording track, etc. Further, since the centrifugal force applied to the disk increases as the rotational speed of the disk increases, and this centrifugal force causes the disk to self-destruct, there is a limit to increasing the writing speed.

  The present invention has been made in view of such circumstances, and a main object thereof is to make the disk mounting portion non-rotating and to rotate the support that supports the optical head, so that the speed of the disk is higher than that of rotating the disk. It is an object of the present invention to provide a disk device capable of writing and / or reading.

  Another object of the present invention is to make the rotation center of the support and the recording track center of the disk easily coincide with each other by moving the disk mounting portion in a direction crossing the rotation center line of the support. It is to provide a disk device that can be used.

  Another object of the present invention is to provide a disk device that can reduce the size of the entire disk device by moving the optical head in a direction crossing the rotation center line of the support.

  Another object is to provide a disk device that can reduce vibration during writing and / or reading by providing the moving mechanism with a weight that moves in the opposite direction to the optical head in conjunction with the movement of the optical head. There is.

  Another purpose is to mount the optical head to one screw part of a screw shaft having screw parts whose spiral directions are opposite at both ends so that the optical head can be relatively rotated and to allow the weight to be relatively rotated to the other screw part. An object of the present invention is to provide a disk device that can reduce the load on the driving means for rotating the support by being screwed.

  Another object of the present invention is to provide a disk device that can further increase the writing and / or reading speed by the optical head by rotating the disk mounting portion in the direction opposite to the rotation direction of the support. It is in.

  A disk apparatus according to the present invention is a disk apparatus comprising: a disk mounting unit on which a disk is mounted; an optical head that writes and / or reads data on the disk; and a support that supports the optical head. The support is rotatable about an axis orthogonal to the disk mounting portion, and includes a driving means for rotating the support.

  In this invention, in order to rotate the support of the optical head that can increase the rigidity and processing accuracy than the disk, the optical head can be rotated at a rotational speed higher than the self-destructive rotational speed of the disk, Writing and / or reading can be performed at a higher speed than when the disk is rotated.

  Further, the disk device according to the present invention is characterized in that the disk mounting part is movable in a direction intersecting with the rotation center line of the support, and has a moving means for moving the disk mounting part. .

  In this invention, since the center position of the recording track of the disk can be adjusted by moving the disk mounting portion, the center of rotation of the support and the center of the recording track can be easily matched. The writing performance and / or the reading performance of the optical head can be improved.

  In the disk device according to the present invention, the optical head is movable in a direction intersecting with the rotation center line of the support, and the support includes a moving mechanism for moving the optical head. And

  In the present invention, since the support for rotating the optical head includes the moving mechanism, the entire disk device is compared with the case where a moving mechanism for moving the optical head is provided separately from the electric motor for rotating the disk. Can be miniaturized.

  In the disk device according to the present invention, the moving mechanism includes a weight that moves in a direction opposite to the optical head in conjunction with the movement of the optical head.

  In the present invention, since the weight moves in the opposite direction to the optical head in conjunction with the movement of the optical head, the mass balance at the time of writing and / or reading can be maintained, and at the time of writing and / or reading Vibration can be reduced.

  In the disk device according to the present invention, the moving mechanism is capable of rotating, and has screw shafts having screw portions with opposite spiral directions at both ends thereof, and one screw portion of the screw shaft. The optical head is screwed to be relatively rotatable, and the weight is screwed to the other screw portion so as to be relatively rotatable.

  In this invention, since the optical head and the weight can be moved in the reverse direction by one screw shaft, the number of parts of the moving mechanism can be reduced, the weight of the support can be reduced, and the load of the driving means can be reduced. Can be reduced.

  Further, the disk device according to the present invention is characterized in that the disk mounting portion is rotatable in a direction opposite to the rotation direction of the support, and includes a rotating means for rotating the disk mounting portion.

  In the present invention, since the disk can be rotated in the opposite direction to the optical head while rotating the optical head, the writing and / or reading speed by the optical head can be further increased.

  According to the present invention, the optical head can be rotated at a rotational speed higher than the self-destructive rotational speed of the disk, and writing and / or reading can be performed at a higher speed than when the disk is rotated.

  Further, according to the present invention, the center of rotation of the support and the center of the recording track can be easily matched, and the writing and / or reading performance of the optical head can be improved.

  Further, according to the present invention, the overall size of the disk device can be reduced as compared with the case where a moving mechanism for moving the optical head is provided separately from the electric motor for rotating the disk.

  Furthermore, according to the present invention, the mass balance during writing and / or reading can be maintained, and vibration during writing and / or reading can be reduced.

  In addition, according to the present invention, the number of parts of the moving mechanism can be reduced, the support body can be reduced in weight, and the load on the driving means can be reduced.

  In addition, according to the present invention, the writing and / or reading speed by the optical head can be further increased.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1
FIG. 1 is a partially cutaway schematic front view showing the structure of a disk device according to the present invention, FIG. 2 is a schematic side view, and FIG. 3 is a schematic perspective view showing the structure of a main part.
The disk device is movably mounted on a stationary member 1 serving as a base, and a flat stage 2 having a disk mounting portion 21 on which a disk A is mounted, and writing and / or reading of data on the disk A. An optical head 3 to be performed, a support 4 that supports the optical head 3 so as to be movable in parallel with the disk mounting portion 21, and is rotatably disposed at a position facing the disk mounting portion 21, and rotates the support 4. An electric motor 5 as a driving means for moving, a moving mechanism 6 for moving the optical head 3 in a direction crossing the rotation center line of the support 4, and a moving direction of the optical head 3 and a direction crossing the moving direction. And moving means 7 for moving to.

  The stage 2 is formed of a rectangular plate, and is provided with a flat circular disk mounting portion 21 on the upper surface portion. Two moving means 7 are provided between the one side surface and the other side surface adjacent to the one side surface and the stationary member 1. , 7 are provided.

  The moving means 7, 7 are attached to the rack teeth 71, 71 provided on the one side surface 2 a and the other side surface 2 b of the stage 2, the pinions 72, 72 meshing with the rack teeth 71, 71, and the stationary member 1. And the electric motors 73 and 74 for rotating the pinions 72 and 72, the stage 2 is moved in the moving direction of the optical head 3 by driving the electric motor 73, and the stage 2 is optically driven by driving the electric motor 74. The head 3 is configured to move in a direction that intersects the moving direction of the head 3.

  The support body 4 is formed of a rectangular box member, the lower surface faces the disk mounting portion 21 in parallel, and the motor shaft 51 of the electric motor 5 is coupled to the center portion of the upper surface and is supported by the stationary member 1. The electric motor 5 is driven to rotate around an axis orthogonal to the disk mounting portion 21, and the optical head 3 and the moving mechanism 6 are accommodated in the support 4. A guide strip 41 for guiding the movement and a guide strip 42 for guiding the movement of the weight 8 to be described later are provided inside the support 4. The electric motor 5 is supported on the stationary member 1 by a gantry (not shown).

  The moving mechanism 6 includes a screw shaft 61 that is rotatably supported at a position parallel to the moving direction of the optical head 3, and an electric motor 62 that rotates the screw shaft 61. The screw shaft 61 has screw portions 61a and 61b whose spiral directions are opposite at both ends, and has a pinion 61c at the center, and a drive gear 63 provided on the motor shaft 62a of the electric motor 62 is a pinion 61c. The screw shaft 61 is rotated by the drive of the electric motor 62. The optical head 3 having the engaging portion 3a that engages with the guide strip portion 41 is screwed to one screw portion 61a, and the engaging portion 8a that engages the guide strip portion 42 to the other screw portion 61b. The optical head 3 and the weight 8 are moved in the reverse direction along the guide strips 41 and 42 by the rotation of the screw shaft 61. The weight 8 has the same mass as the optical head 3 and is screwed at a position equal to the distance from the rotation center of the support 4 to the optical head 3.

  The optical head 3 passes a light beam modulated in accordance with the data to be written, through an objective lens 31 arranged so that its optical axis is parallel to the rotation center of the support 4, and collects it on a small-sized light spot. Then, projection is performed on a recording track formed on the surface of the disk A, and recording is performed by forming a recording mark which is a reversed magnetic domain on the recording track, and reflected light from the surface of the disk A is used as an objective. The lens 31 collects and takes out, and converts the data into data to perform reading. The objective lens 31 condenses the light beam into a light spot, and holds and engages the objective lens 31. Position control hand that finely moves the objective lens 31 in the radial direction and the focal length direction of the disc A in order to align the focal position of the holding member 32 having the portion 3a and the objective lens 31 on the recording track. It is equipped with a door. The holding member 32 of the optical head 3 is screwed to the screw portion 61a, and the engaging portion 3a of the holding member 32 engages with the guide strip 41, whereby the holding member 32 is prevented from rotating, and the screw shaft With the rotation of 61, the screw shaft 61 moves in the axial direction.

  The disk device configured as described above is placed on the disk mounting portion 21 so that the disk A does not rotate, and the support 4 is rotated by the drive of the electric motor 5, and the light supported by the support 4. The head 3 rotates with respect to the disk A, and the light beam modulated in accordance with the data to be recorded is condensed on the light spot by the objective lens 31 of the optical head 3, and the recording track on the surface of the disk A from the objective lens 31. Writing can be performed by projecting upward. With this writing, the electric motor 62 is driven so that the optical head 3 changes its position in the radial direction of the disk A, and the screw shaft 61 is rotated by the electric motor 62 and is screwed to the screw portion 61a. 3 moves, the position of the optical head 3 with respect to the disk A changes, and the weight 8 screwed to the screw portion 61b moves in the direction opposite to the moving direction of the optical head 3, so that the position of the optical head 3 changes. The change in mass balance caused by the above can be canceled out, and the occurrence of vibration can be prevented. Further, along with the above writing, the objective lens 31 is finely moved in the radial direction and the focal length direction of the disk A by the position control means of the optical head 3 to control the focal position on the recording track. In the process of controlling the focal position, the positional deviation between the center of rotation of the support 4 and the center of the recording track is detected by the detecting means, and the amount of positional deviation is calculated by a control unit comprising a microprocessor based on the detection result, The electric motors 73 and 74 are driven by a control signal output from the control unit, and the stage 2 moves in a direction crossing the moving direction of the optical head 3 and the moving direction of the optical head 3, and the rotation center position of the support 4. The center position of the recording track can be matched.

  As described above, since the disk A is non-rotating, the disk is not self-destructed due to centrifugal force, and the support 4 supporting the optical head 3 can be freely selected in comparison with the disk. In addition, since the thickness dimension can be freely set, the disk can be formed to withstand a rotational load higher than the rotational speed at which the disk self-destructs by centrifugal force. Further, since the disk mounting portion 21 is moved by the moving means 7 and the rotation center position of the support 4 and the center position of the recording track can be matched, the burden of adjusting the objective lens by the position control means can be reduced. It is possible to control the focal position on the recording track corresponding to the high speed rotation.

Embodiment 2
The disk device according to the second embodiment is configured such that the stage 2 having the disk mounting portion 21 can be rotated in the direction opposite to the rotation direction of the support 4 and includes a rotating means for rotating the stage 2. A is rotated in opposite directions.

  In the second embodiment, one of the stage 2 and the stationary member 1 is provided with a shaft portion concentrically with the center of the disk mounting portion 21, and the shaft portion is fitted in the other of the stage 2 and the stationary member 1. A fitting hole is provided, and the stage 2 can be rotated with respect to the stationary member 1. The rotating means includes an electric motor and a transmission mechanism that transmits the rotation of the electric motor to the stage 2. For example, the transmission mechanism may be configured such that the shaft portion is rotatable and the rotation of the electric motor 5 is transmitted to the shaft portion, or a tooth portion is provided around the circular peripheral surface of the stage 2 and the tooth portion is provided. The rotation of the electric motor is transmitted to the stage 2 through a transmission gear that meshes with the stage 2.

In the second embodiment, the stage 2 on which the disk A is mounted can be rotated in the opposite direction to the support 4 while rotating the support 4 that supports the optical head 3. Since A can be rotated in the opposite direction to the optical head 3, the writing and / or reading speed by the optical head 3 can be further increased.
Since other configurations and operations are the same as those of the first embodiment, the same components are denoted by the same reference numerals, and detailed description thereof and description of operations and effects are omitted.

In the embodiment described above, the stage 2 is configured to be movable in the moving direction of the optical head 3 and in a direction intersecting with the moving direction. However, instead of moving the stage 2, the optical head 3 and the moving mechanism are used. 6 may be configured as a unit, and the unit may be configured to be movable in the moving direction of the optical head 3 and in the direction intersecting with the moving direction.
Further, the disk device according to the present invention may be configured with an optical head for writing and reading data in addition to an optical head for writing and reading data on the disk.

It is the schematic front view which fractured | ruptured a part which shows the structure of the disc apparatus based on this invention. 1 is a schematic side view showing a configuration of a disk device according to the present invention. It is a schematic perspective view which shows the structure of the principal part of the disc apparatus based on this invention.

Explanation of symbols

3 optical head 4 support 5 electric motor (drive means)
6 Moving mechanism 61 Screw shaft 61a, 61b Screw part 7 Moving means 8 Weight 21 Disk mounting part A Disk

Claims (6)

  A disk apparatus comprising: a disk mounting unit on which a disk is mounted; an optical head that writes and / or reads data on the disk; and a support that supports the optical head, wherein the support is the disk mounting unit And a drive means for rotating the support, wherein the disk device is rotatable about an axis perpendicular to the disk.   2. The disk apparatus according to claim 1, wherein the disk mounting portion is movable in a direction intersecting with a rotation center line of the support, and has a moving means for moving the disk mounting portion.   3. The disk apparatus according to claim 1, wherein the optical head is movable in a direction intersecting with a rotation center line of the support, and the support includes a moving mechanism for moving the optical head.   4. The disk device according to claim 1, wherein the moving mechanism includes a weight that moves in a direction opposite to the optical head in conjunction with the movement of the optical head. 5.   The moving mechanism is rotatable, and has a screw shaft having screw portions with opposite spiral directions at both ends thereof, and the optical head is screwed so as to be relatively rotatable on one screw portion of the screw shaft. The disk device according to claim 4, wherein the weight is attached to the other screw portion so as to be relatively rotatable. 6. The disk device according to claim 1, wherein the disk mounting unit is rotatable in a direction opposite to a rotation direction of the support, and includes a rotating unit that rotates the disk mounting unit.

Images