JP2004103156A - Disk chucking mechanism and recording and reproducing device provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably hold a disk by preventing the drop out of a magnet for attracting a clamper and a disk loading section. <P>SOLUTION: The disk clamper 32 is provided with an aperture 47 provided with an eaves section 46 for shielding part of a clamper side yoke 44. The magnetic force to prevent the drop out of the magnet and to stably hold a disk-like recording medium between the disk clamper and the disk loading section is maintained. Also, a step of bonding the magnet to the disk loading side yoke is simplified, manufacturing efficiency is enhanced, and the manufacturing cost required for adhesives is reduced. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a disc chucking mechanism and a recording / reproducing apparatus provided with the mechanism, and more particularly, to a disc chucking mechanism and a recording / reproducing apparatus for preventing a magnet from dropping off with a clamper for holding a disc placed on a turntable. Equipment related.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. H11-306629 discloses a conventional technique for a recording / reproducing apparatus capable of recording and reproducing information on and from an optically readable disc such as a compact disc (CD) and a phase change disc.
[0003]
A conventional disk chucking mechanism 60 is shown in FIGS. FIG. 4A is a plan view of a turntable 61 of the disc chucking mechanism 60, and FIG. 4B is a plan view of a disc clamper 62 of the disc chucking mechanism 60. FIG. 5 is a cross-sectional view of the disk chucking mechanism 60 during disk chucking.
[0004]
The disc chucking mechanism 60 mainly includes a turntable 61, a disc clamper 62, and a center portion 63, and a motor shaft 66 is press-fitted into a central cylindrical portion 65 so as to be rotated by a spindle motor 64. In addition, the turntable 61 includes a disk mounting portion 67 on which the disk 68 is mounted.
[0005]
An annular magnet 71 is adsorbed and fixed to a metal mounting yoke 70 provided inside the center axis outer peripheral portion of the center portion 63, and further adhered by an adhesive 77.
[0006]
The disk 68 is moved between the disk mounting portion 67 of the turntable 61 and the disk clamper 62 by the metal annular clamper-side yoke 75 of the disk clamper 62 being attracted to the annular magnet 71 of the center portion 63. It is designed to be pinched.
[0007]
[Problems to be solved by the invention]
However, if the adhesive applied between the mounting yoke 70 and the annular magnet 71 deteriorates over time, when a strong impact is applied to the recording / reproducing apparatus itself, as shown in FIG. In some cases, a problem may occur in which the metal 71 is dropped and is attracted to the metal annular yoke 75 on the disk clamper side.
[0008]
The present invention has been made in view of the above-described problems, and provides a disk chucking mechanism capable of preventing a magnet from falling off and stably holding a disk, and a recording / reproducing apparatus including the disk chucking mechanism. The purpose is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a disc chucking mechanism according to the present invention includes a turntable having a mounting portion for mounting a disc-shaped recording medium, and a center portion for positioning the disc-shaped recording medium on the turntable. A ring-shaped magnet that is attracted and fixed to a metal yoke provided near the outer periphery of the rotation center shaft of the center portion, and a metal ring-shaped yoke that is attracted to the magnet is fixed at a position substantially opposed to the center portion. A disk clamper having an opening provided with an eave portion for partially shielding the metal annular yoke.
Here, the metal yoke and the magnet can be simply magnetically attracted without using an adhesive or the like.
[0011]
In order to achieve the above object, a recording / reproducing apparatus according to the present invention includes a turntable having a mounting portion for mounting a disk-shaped recording medium, and a center portion for positioning the disk-shaped recording medium on the turntable. And a ring-shaped magnet that is attracted and fixed to a metal yoke provided near the outer periphery of the center axis of rotation of the center portion, and a metal ring-shaped yoke that is attracted to the magnet at a position substantially opposed to the center portion. A disk chucking mechanism having a disk clamper fixed and provided with an opening provided with an eave portion for partially shielding a metal annular yoke, and for recording and / or reproducing information on a disk-shaped recording medium An optical system including a lens system, a light detecting unit for detecting return light from a disk-shaped recording medium, and a lens for performing focus and tracking control of the lens system. Characterized in that it comprises a chromatography Kas tracking mechanism.
[0012]
Here, the metal yoke and the magnet in the chucking mechanism can be simply magnetically attracted without using self-adhesion.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific examples of the present invention will be described in detail with reference to the drawings. FIG. 1 schematically shows the configuration of the recording / reproducing apparatus 1. The recording / reproducing apparatus 1 includes a disk chucking mechanism 3 for a disk 2 and an optical head device 4.
[0014]
Examples of the disk 2 include an optically readable disk such as a compact disk (CD) and a phase change disk. The present invention is applicable to all disc-shaped recording media having a center hole formed in the center of the disc. The recording / reproducing device 1 includes a device capable of both reproduction and recording, in addition to a device dedicated to recording or reproduction, and may be used in any form such as a stationary type and a portable type.
[0015]
The disk chucking mechanism 3 includes a turntable as a rotary mounting member for mounting the disk 2 and rotating the disk 2 with the power of a driving source, and holds the disk between the disk chuck and a disk clamper as described later. ing.
[0016]
The optical disk device 4 is used for reproducing information recorded on the disk 2 and recording information on the disk 2, and includes a lens system including an objective lens 4a, an optical system, and a photodetector (photodetector, etc.). And a focus and tracking control mechanism.
[0017]
2 and 3 show the basic configuration of the disk chucking mechanism 3. FIG. FIG. 2A is a plan view of the disc chucking mechanism 3 on the turntable side, and FIG. 2B is a plan view of a disc clamper of the disc chucking mechanism 3. FIG. 3 is a cross-sectional view of the disk chucking mechanism 3 during disk chucking.
[0018]
The disc chucking mechanism 3 mainly includes a turntable 31, a disc clamper 32, and a center portion 33.
[0019]
The turntable 31 has a motor shaft 36 pressed into a central cylindrical portion 35 so as to be rotated by a spindle motor 34. In addition, the turntable 31 includes a disk mounting portion 37 on which the disk 2 is mounted. The spindle motor 34 is attached to and supported by the chassis 5.
[0020]
An annular magnet 40 is adsorbed and fixed to a metallic mounting side yoke 39 on the outer periphery of the center axis of the center portion 33, and further adhered by an adhesive. The magnet 40 attracts a metal annular yoke 44 provided at a position facing the disk clamper 32 described later.
[0021]
The disk clamper 32 is provided with an opening 47 provided with an eave portion 46 (FIGS. 2B and 3) for partially shielding the annular metal clamper-side yoke 44. The disc 2 is sandwiched between the disc mounting portion 37 of the turntable 31 by the disc clamper 32, and is held so as not to be displaced by an impact or the like.
[0022]
With the disk chucking mechanism 3 as described above, when the disk 2 is mounted on the disk mounting portion 37, the magnet and the yoke provided at the positions facing each other attract each other, so that the disk 2 is moved. The disc 2 is sandwiched between the disc clamper 32 and the disc mounting portion 37 to prevent the center of the mounted disc 2 from shifting.
[0023]
In particular, in this specific example, since a part of the magnet 40 is shielded by the eave portion 46, the magnetic flux on the magnet surface is regulated, and the attraction force of the magnet 40 to the clamper-side yoke 44 is reduced by the attraction of the magnet 40 to the mounting-side yoke 40. Weaker than power.
[0024]
As a result, even if the strength of the adhesive bonding the magnet 40 to the mounting side yoke 40 may decrease due to aging, the magnetic flux density generated between the magnet surfaces A and B and each yoke may be reduced. Due to the difference, it is possible to prevent a problem that the magnet 40 separates from the mounting side yoke 39 and is attracted to the clamper side yoke 44 of the disk clamper 32.
[0025]
Further, if the degree of shielding of the clamper-side yoke 44 is adjusted by the eaves portion 46, the magnetic attraction of the magnet 40 to the clamper-side yoke 44 can be controlled, so that the disk between the disk clamper 32 and the disk mounting portion 37 can be controlled. A state in which the magnet 40 and the mounting side yoke 39 do not need to be bonded and fixed can be realized while maintaining the magnetic force for stably holding the magnet 2. This simplifies the process of bonding the magnet 40 to the mounting side yoke 39, increases the manufacturing efficiency, and reduces the manufacturing cost of the adhesive.
[0026]
【The invention's effect】
As described in detail above, the disk chucking mechanism according to the present invention has a turntable having a mounting portion for mounting a disk-shaped recording medium, a center portion for positioning the disk-shaped recording medium on the turntable, It has an annular magnet adsorbed and fixed to a metal yoke provided near the outer periphery of the center axis of rotation of the center portion, and a metal annular yoke that adsorbs the magnet is fixed at a position substantially opposed to the center portion, Since a disk clamper having an opening provided with an eave portion for partially shielding the metal annular yoke is provided, the degree of shielding of the magnet and the metal annular yoke on the disk clamper side can be adjusted by the eave portion. Therefore, the magnetic attraction of the magnet to the clamper-side yoke can be controlled. Thus, the magnet can be prevented from falling off, and the magnetic force for stably holding the disk-shaped recording medium between the disk clamper and the disk mounting portion can be maintained.
[0027]
Further, since the magnetic attraction force of the magnet to the metal annular yoke on the disk clamper side can be controlled by the eaves, the metal mounting yoke and the magnet do not have to be bonded and fixed with an adhesive or the like. . This simplifies the process of bonding the magnet to the mounting yoke, increases the manufacturing efficiency, and reduces the manufacturing cost of the adhesive.
[0028]
Further, the recording / reproducing apparatus according to the present invention includes the characteristic disk clamper having the eaves portion, so that the degree of shielding between the magnet and the clamper-side yoke can be adjusted. The suction power can be controlled. Thus, the magnet can be prevented from falling off, and the magnetic force for stably holding the disk-shaped recording medium between the disk clamper and the disk mounting portion can be maintained.
[0029]
Also, since the magnetic attraction of the magnet to the clamper-side yoke can be controlled by the eaves, the mounting-side yoke and the magnet do not have to be bonded and fixed with an adhesive or the like. This simplifies the process of bonding the magnet to the metal yoke, increases manufacturing efficiency, and reduces the manufacturing cost of the adhesive.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of a configuration of a recording / reproducing apparatus shown as a specific example of the present invention.
FIG. 2A is a plan view of a disc chucking mechanism of the recording / reproducing apparatus on a turntable side, and FIG. 2B is a plan view of a disc clamper of the disc chucking mechanism.
FIG. 3 is a cross-sectional view of the disk chucking mechanism in the recording / reproducing apparatus during disk chucking.
FIG. 4A is a plan view of a disc chucking mechanism of a conventional recording / reproducing apparatus on a turntable side, and FIG. 4B is a plan view of a disc clamper of the disc chucking mechanism.
FIG. 5 is a transverse cross-sectional view of a conventional recording / reproducing apparatus when a disk chucking mechanism performs disk chucking.
FIG. 6 is a cross-sectional view illustrating a state in which a magnet is dropped during disk chucking in a conventional recording / reproducing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Recording / reproducing apparatus 2 Disk 3 Disk chucking mechanism 4 Optical head device 31 Turntable 32 Disk clamper 33 Center part 34 Spindle motor 35 Central cylindrical part 36 Motor shaft 37 Disk mounting part 39 Mounting yoke 40 Magnet 44 Clamper yoke 46 Eaves

Claims (4)

Turntable having a mounting portion for mounting a disk-shaped recording medium,
A center portion for positioning the disk-shaped recording medium on a turntable,
An annular magnet adsorbed and fixed to a metal yoke provided near the outer periphery of the rotation center shaft of the center portion,
A disk clamp having a metal ring-shaped yoke adsorbing the magnet is fixed at a position substantially opposed to the center portion, and a disk clamper having an opening provided with an eave portion for partially shielding the metal ring-shaped yoke. A disk chucking mechanism comprising: 2. The recording / reproducing apparatus according to claim 1, wherein the metal yoke and the magnet are only magnetically attracted. A turntable having a mounting portion for mounting the disk-shaped recording medium, a center portion for positioning the disk-shaped recording medium on the turntable, and a metal yoke provided near the outer periphery of the center axis of rotation of the center portion A metal annular yoke that is attracted to and fixed to the magnet is fixed at a position substantially opposite to the center portion, and an eave for partially shielding the metal annular yoke A disk chucking mechanism including a disk clamper having an opening provided with a portion,
An optical system including a lens system that records and / or reproduces information with respect to the disc-shaped recording medium;
A light detection unit for detecting return light from the disk-shaped recording medium,
A recording and reproducing apparatus comprising: a focus tracking mechanism that performs focus and tracking control of the lens system. 4. The recording / reproducing apparatus according to claim 3, wherein the metal yoke and the magnet in the chucking mechanism are only magnetically attracted.

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