JP2006139867A - Optical disk device and disk clamping structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk clamping structure capable of easily setting optical disk clamping force at the time of optical disk clamping in an optical disk device. <P>SOLUTION: This disk clamping structure is includes a first clamper 2 arranged coaxially to a metallic plate 1, a second clamper 3 positioned on a side opposite to the metallic plate with respect to the first clamper to hold the metal plate with the first clamper, a magnet 6 for magnetically attracting the metallic plate, and a table 4 for housing the magnet in a predetermined position related to a rotary shaft to attract the metallic plate along the axis line of the rotary shaft by magnetism from the magnet thereby supporting the optical disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical disc apparatus for reproducing information from an optical disc as an information recording medium or recording information on an optical disc, and a disc clamp structure used for the optical disc device.

  In an optical disk apparatus that reproduces information from an optical disk or records information on an optical disk, the motor that rotates the optical disk rotates at a high speed, so that the disk holding force of the disk clamp structure that holds the disk must be sufficiently ensured. I must.

  In the disc clamp structure, the mounted optical disc is pressed against the turntable (motor) side so that the distance between the optical head of the optical disc apparatus and the information recording surface of the optical disc does not fluctuate, or when the motor is started There is also a need to be able to prevent the optical disk from slipping when stopped.

  However, if the disc holding force in the disc clamp structure, for example, the pressing force of the claw in the structure holding the optical disc by the claw structure is too strong, a large force is required when removing the optical disc (during unclamping).

From such a background, a clamper yoke (metal plate) is disposed on the side opposite to the turntable side of the optical disk set on the turntable, and the clamper yoke is magnetically attracted to thereby place the optical disk on the predetermined turntable. A magnetic attraction type disk clamp structure that is fixed at the position of (2) has been put into practical use (for example, see Patent Document 1).
JP 2003-228900 A (paragraph 0022, FIG. 3)

  The clamp device described in Patent Document 1 describes a configuration that increases the accuracy of the interval between a permanent magnet that forms a magnetic path and a clamper yoke in order to maintain a predetermined magnetic attractive force.

  However, the speed at which the optical disk is rotated, particularly called N-times speed, and when the clamping force is reconsidered by changing the multiple of the basic reproduction linear speed, or the magnetic force and shape of the permanent magnet provided on the turntable of the disk motor. Is changed, the clamping force, that is, the magnetic attraction force acting on the clamper yoke must be changed.

  By the way, changing the magnetic force acting on the clamper yoke, that is, the magnetic attraction force, is changing the distance between the permanent magnet and the clamper (clamper plate). It is necessary to change the shape, for example, the thickness of the clamper.

  This not only requires changing the mold used for molding the clamper, but also has the problem that fine adjustment is difficult. Further, when the thickness of the clamper is changed, there is a possibility that a new problem such as short mold or sink marks may occur, and there is a limit to adjustment.

  The clamping force by the magnetic attraction force balances the slip torque required when rotating (starting) and stopping the optical disk and the load acting on the structural elements such as the chuck during the unclamping (release) operation of the optical disk. Subtle settings are an essential requirement because they are determined in consideration.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic clamp type disk clamp structure and a disk clamp structure in which an optical disk clamping force at the time of optical disk clamping can be easily set in an optical disk apparatus using the same.

  The present invention relates to a metal plate member capable of acting with a magnetic attraction force, a first resin clamper member disposed coaxially with the metal plate member, and the first resin clamper member. A second resin clamper member positioned on the opposite side of the metal plate member and sandwiching the metal plate member together with the first resin clamper member; and the metal together with the first and second resin clamper members A magnet for attracting the plate member by magnetism; and a rotating shaft; the magnet is accommodated in a predetermined position associated with the rotating shaft so as to be rotatable about the rotating shaft; Accordingly, the first and second resin clamper members and the metal plate member are sucked along the axis of the rotary shaft to rotatably support the object to be held. And the member, the disc clamp structure of a motor member for rotating the table member consists of an optical disk apparatus, there is provided a.

  The metal clamper member has a protrusion whose protrusion is defined along the axis of the rotation shaft, and the size of the protrusion is associated with at least one of the shape and height of the magnet accommodated in the table member. And can be changed.

  The size of the convex portion of the metal clamper member is defined by half punching or drawing.

  According to the present invention, in a magnetic attraction type disk clamp structure and an optical disk apparatus using the same, a disk clamp structure capable of easily setting an optical disk clamping force at the time of optical disk clamping can be easily obtained. In particular, the distance from the permanent magnet can be adjusted only by adjusting the height of the convex part of the metal clamper plate without being affected by the thickness of the resin clamper. It becomes possible to easily and flexibly cope with the adjustment of the clamping force when the magnetic force of the permanent magnet changes due to a change or the like.

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

  1 to 3 show an example of an optical disk apparatus to which an embodiment of the present invention is applied and a disk clamp structure incorporated in the optical disk apparatus.

  An optical disk device 101 shown in FIG. 1 has a mechanical chassis 11 that holds a disk clamp mechanism 10 described in detail later with reference to FIG. FIG. 1 shows a state in which an exterior cover, a control circuit board, and the like are removed in order to explain with the mechanical chassis 11 exposed.

  The mechanical chassis 11 is provided with an optical pickup 12 that writes information on the optical disk D (see FIG. 3) by laser light or reads information from the optical disk D.

  The optical pickup 12 is supported on the two shafts 14 and is moved on the shaft 14 by the feed motor 13. That is, the rotation of the feed motor 13 fixed to the mechanical chassis 11 is transmitted to the rack gear 15 attached to the optical pickup 12 via the lead screw integrated with the motor 13 to move the optical pickup 12.

  One end of the shaft 14 (on the motor 13 side) that supports the optical pickup 12 is fixed to a fixing portion 16 that is fixed to the mechanical chassis 11. The other end of the shaft 14 on the motor 13 side and both ends of the remaining shaft 14 are placed on the peripheral surface of the spiral cam 17 rotatably attached to the mechanical chassis 11 and are also mounted on the spiral cam 17 by a spring (not shown). It is pressed up. By rotating the spiral cam 17, the height of the end of the shaft 14 from the mechanical chassis 11 can be adjusted. With this configuration, adjustment is made so that the laser light emitted from the optical pickup 12 enters the optical disc D correctly.

  On the mechanical chassis 11, a disk motor 9 is fixed, which is integrally provided with a disk clamp mechanism 10 shown in FIGS. The disc motor 9 is provided with a disc table 4 to which, for example, a ring-shaped rubber (elastic body) is attached to prevent the optical disc D from slipping, and a disc chuck portion 5 for centering the optical disc D. Yes.

  A ring-shaped permanent magnet 6 is fixed inside the disc chuck portion 5. A guide hole 7 for centering a clamper structure (1, 2, 3) described below with reference to FIG.

  FIG. 2 shows an example of an embodiment of a clamper structure incorporated in the disc clamp structure of the optical disc apparatus shown in FIG. FIG. 2 shows a state in which the clamper structure is disassembled into a clamper plate and a pair of resin clampers.

  The disc clamp structure 10 of the optical disc apparatus 101 includes a resin-made first clamper (clamper A) 2 and a resin-made second clamper (clamper B) 3 into which a metal clamper plate 1 is inserted. The optical disk D can be held on the disk table 4 with a predetermined force by being attracted by the magnetic force provided by the permanent magnet 6 attached to the 9 side.

  The clamper plate 1 is inserted into a predetermined position inside the first clamper 2 and the second clamper 3. The second clamper 3 is provided with a ring-shaped hole 3a that allows the clamper plate 1 to be exposed. In addition, a ring-shaped hole 1 a through which the guide shaft 2 a of the first clamper 2 passes is formed at the approximate center of the clamper plate 1. The clamper plate 1 is further provided with a stepped portion 1b which is a circular half punch or a diaphragm having a smaller diameter than the hole 3a of the second clamper 3.

  FIG. 3 shows a schematic cross section of the disc clamp structure shown in FIGS. 1 and 2 with the optical disc clamped.

  The optical disk D is held between the disk table 4 and the clamper structure (1, 2, 3) and pressed against the disk table 4 on the disk motor 9 with a predetermined pressure.

  In the clamping operation of the optical disk D, the optical disk D is first placed on the disk table 4 and centering is performed by fitting with the disk chuck portion 5.

  Subsequently, the clamper structure (1, 2, 3) is attracted by the magnetic force from the permanent magnet 6.

  The clamper structure is centered when the guide shaft 2 a of the first clamper 2 is fitted into the guide hole 7 of the disk motor 9 and is attracted to the motor 9 side by the magnetic force from the permanent magnet 6.

  As a result, the optical disk D is pressed against the disk table 4 with a predetermined pressing force, and the optical disk D is clamped.

  FIG. 4 shows the relationship between the clamper plate and the permanent magnet of the disk clamp structure shown in FIG.

  The height [a] of the stepped portion 1b of the clamper plate 1 contributes to the adjustment of the holding force of the optical disc D at the time of clamping, that is, the clamping force. The height [a] of the stepped portion 1b is formed in a state in which there is almost no variation (deviation) for each part by half punching or drawing, so that the clamper plate receiving surface 1c of the second clamper 3 (see FIG. 2) The distance [b] between the permanent magnet 6 and the permanent magnet 6 can be defined to be substantially constant by setting the height [a] from the distance to the optimum size.

  This is because, for example, the height [a] of the stepped portion 1b of the clamper plate 1 and the permanent magnet 6 at the time of clamping due to the height of the permanent magnet 6 itself, the size of the disk table 4 or the specification change of the disk motor 9, etc. When it is necessary to change the relationship with the distance [b], the force acting on the clamper structure, that is, the clamper plate 1 is adsorbed only by changing the height [a] of the stepped portion 1b of the clamper plate 1. Therefore, the magnetic force can be easily and appropriately changed little by little. Note that the height [a] of the stepped portion 1b of the clamper plate 1 can be changed little by little with a very high degree of accuracy by only changing the degree of drawing or half punching of the clamper plate 1. Further, since the height [a] of the stepped portion 1b is defined by drawing or half punching, its shape error is very high as compared with resin molding, and individual variations are small.

  5 to 8 illustrate that the clamping force can be adjusted by setting the distance between the stepped portion of the clamper plate shown in FIG. 4 and the permanent magnet. FIG. 5 shows the amount by which the height of the convex portion of the clamper plate is changed, and FIG. 6 shows the change in the interval between the height of each convex portion shown in FIG. 5 and the permanent magnet. FIG. 7 shows changes in the magnetic force of the permanent magnets of the disk motor, and FIG. 8 shows the intervals generated between the heights of the individual protrusions of the clamper plate shown in FIG. 6 and the permanent magnets shown in FIG. This indicates that the final magnetic attraction force is set to a certain level even when the change occurs.

  For example, as shown in FIGS. 6 and 7, when a disk motor [2] having a strong magnetic force of a permanent magnet is used for the reference disk motor [1], the height of the convex portion [a ( As shown in FIG. 8, the distance [b] between the permanent magnet 6 and the clamper plate 1 at the time of clamping is increased to “b + Δa1” as shown in FIG. Thus, the same clamping force can be obtained.

  Further, when the disk motor [3] having a weak magnetic force is used, the height [a (see FIG. 5)] of the clamper plate 1 is increased by “Δa2”, and the interval [b] is as shown in FIG. By reducing to “b−Δa2”, the same clamping force can be obtained as shown in FIG.

  As a result, when changing to a different type of disk motor or when using a plurality of disk motors together, a uniform clamping force can be obtained simply by changing the clamper plate 1.

  As described above, according to the present invention, the distance from the permanent magnet can be adjusted only by adjusting the height of the convex portion of the metal clamper plate without being influenced by the thickness of the resin clamper. It is possible to easily and flexibly cope with the adjustment of the clamping force when the magnetic force of the permanent magnet changes due to the change of the clamping force or the change of the manufacturer of the disk motor.

  Note that the present invention is not limited to the above-described embodiment, and various modifications or changes can be made without departing from the scope of the invention at the stage of implementation. Further, the individual embodiments may be appropriately combined as much as possible, and in that case, the effect of the combination can be obtained.

1 is a schematic diagram for explaining an example of an optical disc apparatus to which an embodiment of the present invention is applied. Schematic which shows an example of the disk clamp structure integrated in the optical disk apparatus shown in FIG. FIG. 2 is a schematic cross-sectional view showing an example of a disc clamp structure incorporated in the optical disc apparatus shown in FIG. 1. Schematic which shows the relationship between the clamper plate of a disc clamp structure shown in FIG. 3, and a permanent magnet. Schematic explaining the principle which can adjust a clamping force by setting the distance between the magnitude | size of the level | step-difference part of the clamper plate shown in FIG. 4, and a permanent magnet. Schematic explaining the principle which can adjust a clamping force by setting the distance between the magnitude | size of the level | step-difference part of the clamper plate shown in FIG. 4, and a permanent magnet. Schematic explaining the principle which can adjust a clamping force by setting the distance between the magnitude | size of the level | step-difference part of the clamper plate shown in FIG. 4, and a permanent magnet. Schematic explaining the principle which can adjust a clamping force by setting the distance between the magnitude | size of the level | step-difference part of the clamper plate shown in FIG. 4, and a permanent magnet.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Clamper plate, 1a ... Hole (guide shaft penetration part), 1b ... Step part, 1c ... Clamper plate receiving surface, 2 ... 1st clamper (clamper A), 2a ... Guide shaft, 3 ... 2nd clamper ( (Clamper B), 4 ... disc table, 5 ... disc chuck, 6 ... permanent magnet, 7 ... clamper guide hole, 8 ... disc motor, D: optical disc.

Claims (9)

A metal plate member capable of acting on the magnetic adsorption force;
A first resin clamper member disposed coaxially with the metal plate member;
A second resin clamper member positioned on the opposite side of the metal plate member with respect to the first resin clamper member and sandwiching the metal plate member together with the first resin clamper member;
A magnet for magnetically attracting the metal plate member together with the first and second resin clamper members;
The first and second resin clamper members have a rotation shaft, accommodate the magnet at a predetermined position associated with the rotation shaft so as to be rotatable about the rotation shaft, and the magnet from the magnet. And a table member that sucks the metal plate member along the axis of the rotation shaft and rotatably supports the object to be held,
A motor member for rotating the table member;
A disk clamp structure for an optical disk apparatus comprising:   The metal clamper member has a convex portion whose projection amount is defined along the axis of the rotation shaft, and the size of the convex portion is the shape and height of the magnet accommodated in the table member. 2. The disc clamp structure for an optical disc apparatus according to claim 1, wherein the disc clamp structure can be changed in association with at least one of the two.   The metal clamper member has a convex portion whose protrusion amount is defined along the axis of the rotating shaft, and the size of the convex portion is associated with the shape of the structure that houses the magnet of the motor member. 2. The disc clamp structure for an optical disc apparatus according to claim 1, wherein the disc clamp structure can be changed.   The metal clamper member has a convex portion whose protrusion amount is defined along the axis of the rotating shaft, and the size of the convex portion can be changed according to the number of rotations of the motor member. 2. The disc clamp structure for an optical disc apparatus according to claim 1, wherein A metal plate member capable of acting on a magnetic attraction force, a first resin clamper member arranged coaxially with the metal plate member, and the metal plate member with respect to the first resin clamper member And a second resin clamper member sandwiching the metal plate member together with the first resin clamper member, and a clamper structure,
A magnet for magnetically attracting the metal plate member of the clamper structure together with the clamper structure and a rotation shaft, and the magnet is associated with the rotation shaft so as to be rotatable around the rotation shaft A table member that is housed in a predetermined position, sucks the metal plate member of the clamper structure along the axis of the rotation shaft by the magnetism from the magnet, and rotatably supports a holding object; A motor member for rotating the table member;
An optical head device for irradiating the holding object with light to record information on the holding object or reproducing information from the holding object;
An optical disc apparatus comprising:   The metal clamper member of the clamper structure has a convex portion whose protrusion amount is defined along the axis of the rotating shaft of the motor member, and the size of the convex portion is the number of rotations of the motor member. 12. The optical disk apparatus according to claim 11, wherein the optical disk apparatus can be changed according to the conditions.   The metal clamper member of the clamper structure has a convex portion whose projection amount is defined along the axis of the rotation shaft of the motor member, and the size of the convex portion is accommodated in the table member. 12. The optical disk apparatus according to claim 11, wherein the optical disk apparatus is changeable in association with at least one of a shape and a height of the magnet.   The metal clamper member of the clamper structure has a convex portion whose projection amount is defined along the axis of the rotating shaft of the motor member, and the size of the convex portion is the magnet of the motor member. 12. The optical disk apparatus according to claim 11, wherein the optical disk apparatus can be changed in association with a shape of a structure that accommodates the disk. A metal plate member on which a magnetic attractive force can act is arranged on the metal plate member coaxially with the first resin clamper member and the opposite side of the metal plate member with respect to the first resin clamper member A clamper structure comprising a second resin clamper member positioned between and a second resin clamper member sandwiching the metal plate member together with the first resin clamper member,
A holding member is rotatably supported by attracting the metal plate member by the magnetism from the magnet to a table member containing a magnet for attracting the metal plate member by magnetism at a predetermined position. When
A magnetic force for holding the optical disk on the disk table with a predetermined pressing force by a magnetic attraction force, wherein the size of the convex portion of the metal clamper member is set in association with the shape of the structure housing the magnet. How to set the suction force.

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