JP2006107601A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge limits of acceleration to which a disk device can endure. <P>SOLUTION: A disk 10 is held between a disk table 5 and a clamper 3, and rotated by an electric motor 6. Also, when the clamper 3 does not hold the disk 10, the clamper 3 is held by a cover body 2 by engaging a flange part 3f fomed at its peripheral part with an inner peripheral part of a holding hole 2h formed on the cover body 2. When information is read out from the disk 10, or information is recorded in the disk 10, distance t<SB>1</SB>between the clamper 3 and a case body 11, distance t<SB>2</SB>between the clamper 3 and a part at which the holding hole 2h is provided (disk holding means support part 2s), and distance t<SB>3</SB>between the disk holding means support part 2s and the disk 10 are made almost equal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk device in which devices are arranged in a housing.

  Recently, for example, disk devices for reproducing a disk such as a CD (Compact Disc) and a DVD (Digital Versatile Disc) or recording / reproducing the disk have been widely used. In such a disk reproducing apparatus, it is necessary to reproduce information recorded at a high density or record information at a high density. For this reason, the information reading unit or the information recording unit is provided with a measure for preventing the occurrence of reading or writing defects due to the acceleration applied to the disk device as much as possible.

  For example, in the disk device disclosed in Patent Document 1, a pedestal on which reproducing means for reading information from a disk is mounted is fixed to a frame body via an elastic member. The vibration transmitted from the frame due to the acceleration applied to the disk device is not directly transmitted to the reproducing means. As a result, information can be read or recorded even when a certain amount of acceleration is applied to the disk device. Further, the disk is prevented from coming into contact with the structure in the disk device during reading or writing of information.

Japanese Patent Laid-Open No. 2003-100069

  However, there is room for improvement so that the disk device can withstand greater acceleration. Therefore, the present invention solves the above-described problem as an example, and an object of the present invention is to increase the limit of acceleration that the disk device can withstand.

  According to the first aspect of the present invention, at least one of reading of information recorded on a disc and recording of information on the disc is executed, and when the disc is rotated, this is held and rotated together with the disc Disk holding means, and when the disk holding means does not hold the disk, a disk holding means support portion for supporting the disk holding means at a fixed position, the disk holding means, and the disk holding means support portion. When reading information from the disk or recording information on the disk, a distance between the disk holding means and the housing, the disk holding means, and the disk holding The distance between the means supporting portion and the distance between the disk holding means supporting portion and the disk are substantially equal. Characterized in that it is a have a disk drive.

  Hereinafter, the present invention will be described in detail with reference to the drawings. The present invention is not limited to the best mode for carrying out the invention. In addition, constituent elements in the embodiments described below include those that can be easily assumed by those skilled in the art or those that are substantially the same. The present invention can be applied to all disk devices that record information on or record information on disks, magnetic disks, magneto-optical disks, and other disks, and the type of the disk is not limited.

(Embodiment)
In the disk device according to this embodiment, when reading information from the disk or recording information on the disk, the distance t ₁ between the disk holding means and the housing, the disk holding means and the disk holding means support section, and the distance t _2, is characterized in that substantially equal to the distance t ₃ of the disk holding means support and the disc.

  FIG. 1 is an overall view showing a disk device according to this embodiment. FIG. 2 is an overall view showing a state in which the case body of the disk device according to this embodiment is removed. FIG. 3 is a schematic diagram showing the internal configuration of the disk device according to this embodiment. The disk device 100 reproduces information recorded on an optical disk (hereinafter referred to as a disk) 10 such as a CD or DVD. The disk device 100 only needs to realize at least one of reproduction of information recorded on the disk 10 and recording of information on the disk 10.

  As shown in FIG. 1, the disk device 100 has a case body 11 attached to a panel 18. The outer shape of the case body 11 is a substantially hexahedron, and a panel 18 is provided on the disk ejection side. As shown in FIG. 2, when the case body 11 is removed, the lid body 2 that supports the clamper 3 appears. As shown in FIG. 3, the apparatus main body 101 is stored in the case body 11.

  The apparatus main body 101 includes a drive unit for the disk 10, an information reading unit for reading information recorded on the disk 10, and the like, and is a core part of the disk apparatus 100. The apparatus main body 101 supports a frame body 1 to which disk drive means, information reading means, a circuit board and the like are attached, and a clamper 3 attached to the frame body 1 as a part of the disk holding means, and a rotating disk 10 and a lid body 2 that protects 10. The frame 1 is made of, for example, a resin material. The lid 2 is preferably made of a metal material that is a good conductor of heat in consideration of heat transfer, but is not limited thereto, and may be made of a resin material.

  The electric motor 6 that is a disk driving unit and the pickup 7 that is an information reading unit are attached to a base 12 made of, for example, a metal plate. The electric motor 6 is, for example, a spindle motor or the like, and rotates the disk 10 held by the disk via the disk holding means. In this embodiment, the disk holding means includes a clamper 3, a disk table 5 that holds the disk 10 by adhering to the clamper 3, and a disk holding boss 4 that protrudes from the disk table 5.

  The clamper 3 is substantially circular, and in a standby state in which information is not read from the disk 10, the flange portion that protrudes from the outer peripheral portion of the clamper 3 engages with the inner peripheral portion of the clamper support hole formed in the lid body 2. Thus, the clamper 3 is supported by the lid 2 in the standby state. The disc holding boss 4 is fitted with a shaft hole drilled in the center of the disc 10. A magnet 5M is incorporated in the disc table 5, and when the clamper 3 clamps the disc 10 by the magnet of the disc table 5 and the attractive force of the metal part of the clamper 3, the disc 10 is held by the disc holding means. .

  The pickup 7 includes a light source such as a laser diode, a lens that converges light from the light source and irradiates the disk 10, and an optical pickup that detects light reflected from the disk 10. The pickup 7 linearly moves in parallel with the radial direction of the disk 10 from the center to the outside while the disk 10 is rotating. In the process, the pickup 7 reads information recorded on the information recording surface of the disk 10.

  The pedestal 12 is attached to an attachment pedestal 14 formed integrally with the frame body 1 via a vibration isolating member 15 made of an elastic material such as rubber. As a result, external shock and vibration transmitted from the frame 1 to the pickup 7 via the pedestal 16 and the pedestal 12 are attenuated, and contact of the disk 10 with the lid 2 and the like can be suppressed. As a result, the pickup 7 can read the information recorded on the disk 10 more reliably.

  A circuit board 16 is attached to the frame 1. The circuit board 16 is an outer portion of the frame body 1 and is disposed between the pedestal 12 and the case body 11. An electric / electronic component 17 such as a CPU (Central Processing Unit) and a capacitor is attached to the circuit board 16, and the operation of the electric motor 6 and the pickup 7 is controlled and a disk read by the pickup 7. 10 pieces of information are processed.

  The apparatus main body 101 is provided with a disk tray 9 on which the disk 10 is placed. The disc tray 9 is driven by a tray drive motor 13 which is a tray drive means, and is sent out to the panel 18 side of the disc device 100. At this position, the disk 10 is placed on the disk tray 9 and the disk 10 is removed from the disk tray 9. When the disk 10 is placed on the disk tray 9, the disk tray 9 is pulled into the apparatus main body 101 by the tray drive motor 13. Then, after being held by the disk holding means, it is rotated by the electric motor 6 and information is read by the pickup 7.

  FIG. 4 is an enlarged view showing a disk holding state of the disk device according to this embodiment. FIG. 4 shows a state where information is read from the disk 10. In this state, the rotation center axis of the disk 10, the rotation center axis of the electric motor 6, the rotation center axis of the clamper 3, and the rotation center axis of the disk table 5 coincide. FIG. 4 shows a state in which the disk device 100 is placed horizontally, that is, the disk device 100 is installed so that the rotation center axis Z of the disk 10 is substantially parallel to the direction of gravity. FIG. 5 is a plan view showing the relationship between the clamper and the support hole of the lid according to this embodiment.

As shown in FIGS. 4 and 5, the clamper 3 is attached to the support hole 2h provided in the lid 2, and the flange portion 3f of the clamper 3 is engaged with the inner peripheral portion of the support hole 2h. That is, as shown in FIG. 5, the flange diameter D ₃ of the clamper 3 is greater than the inner diameter D ₂ of the support hole 2h. The portion of the lid 2 where the support hole 2h is provided is a disc holding means support portion 2s.

  A positioning recess 4h is formed on the surface of the disk holding boss 4 on the clamper 3 side. Further, on the central axis Zc of the clamper 3, there is provided a positioning convex portion 3t to be fitted with the positioning concave portion 4h provided on the disc holding boss 4 side. When the disc 10 is sandwiched between the clamper 3 and the disc table 5, the positioning convex portion 3t is guided to the positioning concave portion 4h. When the disk 10 is sandwiched between the disk table 5 and the clamper 3, the rotation axis of the electric motor 6 and the center axis of the clamper 3 coincide.

As described above, when reading information from the disk 10, the disk 10 is sandwiched between the clamper 3 and the disk table 5 and rotated by the electric motor 6. In this embodiment, when reading information from the disc 10, the distance t ₁ between the clamper 3 and the case body 11, and the distance t ₂ of the clamper 3 and the disk holding means supporting portion 2s, disc holding means supports The distance t ₃ between the portion 2s and the disk 10 is made substantially equal. That is, t ₁ ≈t ₂ ≈t ₃ . Here, “substantially equal” means that when _one of t ₁ , t ₂ , and t ₃ is used as a reference, the other two are within a range of ± 10% to 15% with respect to the reference distance. Say something. In this description, the case body 11 corresponds to a housing.

If at least one of the distances t ₁ , t ₂ , and t ₃ is significantly different from the other dimensions, when the disk device 100 is subjected to acceleration in the direction of the rotation center axis Z, the distances t ₁ , t ₂ , The acceleration resistance limit is determined by the smallest dimension among t ₃ . That is, the lid 2 or the case body 11 and the disk 10 or the clamper 3 are in contact with each other at the smallest portion among the distances t ₁ , t ₂ , and t ₃ .

However, as in this embodiment, if _{t 1 ≒ t 2 ≒ t 3} , when subjected to acceleration of the rotation direction of the center axis Z of the disc 10, the distance of contact between the clamper 3 and the case body 11, The distance at which the clamper 3 and the lid 2 are in contact with the distance at which the lid 2 and the disk 10 are in contact is substantially equal. As a result, when the acceleration in the direction of the rotation center axis Z is received, the lid 2 or the case body 11 and the disk 10 or the clamper 3 come into contact substantially at the same time, and the respective acceleration resistance limits can be made substantially equal. As a result, a sufficient acceleration resistance limit can be secured, and the height of the disk device 100 can be reduced to reduce the size thereof. When the disk device 100 is placed horizontally, for example, t ₁ ≈t ₂ ≈t ₃ can be obtained by adjusting the thickness of the clamper 3 and the dimensions of the lid 2.

  Here, the acceleration resistance limit means the magnitude of acceleration that the disk device 100 can withstand, and more specifically, information reading or information recording failure occurs, or contact with the disk 10 occurs. It represents the magnitude of acceleration up to. The height of the disk device 100 refers to the dimension of the disk device 100 in the direction of the rotation center axis of the disk 10.

Incidentally, placed so-called vertical disk device 100, i.e., in a state where the rotation center axis Z of the disc 10 is installed in disk device 100 so as to be substantially perpendicular to the direction of gravity, attempts to realize t ₁ ≒ t ₂ ≒ t ₃ Then, the following problems arise. 6 and 7 are explanatory diagrams showing the disk holding state when the disk device is placed vertically. When the disk 10 is pinched, the clamper 3 is attracted to a magnet 5M (see FIG. 3) built in the disk table 5. When the disk device 100 is placed vertically, the clamper 3 is guided to the support hole 2 h of the lid 2 by the tapered portion 3 c of the clamper 3. For this reason, if the thickness h of the clamper 3 is not sufficient, the clamper 3 is greatly displaced (difference between Z and Zc in FIG. 6) with respect to the disk table 5 when the disk 10 is held, and the disk 10 There is a problem that can not be held.

  There is also a method of reducing the inner diameter of the support hole 2h of the lid 2 in order to suppress the displacement between the clamper 3 and the disk table 5. However, as a result of the gap between the clamper 3 and the support hole 2h being reduced, a sufficient acceleration resistance limit in the direction orthogonal to the rotation center axis Z of the disk 10 cannot be secured. In addition, a method of suppressing the deviation between the clamper 3x and the disk table 5 by using a cylindrical clamper 3x except for the tapered portion 3c of the clamper 3 shown in FIG. 6 as in the clamper 3x shown in FIG. is there. However, when placed vertically, the disk 10 floats from the disk placement surface of the disk tray 9, and when the disk 10 is transported into the apparatus, it may come into contact with the clamper 3x (FIG. 7). At this time, if the tapered portion is removed as in the clamper 3x shown in FIG. 7, the clamper 3x does not move to the lid 2 side when the disk 10 is in contact, and the disk 10 and the clamper 3x are locked. There is a fear.

In order to solve these problems, the clamper is provided with a taper portion, and the taper portion can be brought into contact with the disk being transported so that the clamper can be retracted. It is sufficient to ensure that the support hole 2h is guided by the cylindrical portion of the clamper. However, if this is done, the position at which information is read from the disc 10 is moved away from the lid 2 by the thickness of the clamper, so that the distance t ₃ (see FIG. 4) between the lid 2 and the disc 10 becomes larger than necessary. End up. As a result, the height of the disk drive device becomes large. The acceleration resistance limit is restricted by the smaller one of the distance t ₁ between the clamper 3 and the case body 11 or the distance t ₂ between the clamper 3 and the lid body 2. As a result, even if the height of the disk drive device is increased, the acceleration resistance limit is not improved.

  Therefore, in this embodiment, the following configuration is adopted. The clamper support structure according to this embodiment has the following configuration. That is, the disk holding means is stored in a cylindrical disk holding means support provided on the lid. In a standby state in which information is not read from the disc, the outer peripheral portion of the disc holding means and the inner peripheral portion of the disc holding means supporting portion are brought into contact with each other to support the clamper.

  FIG. 8A to FIG. 8C and FIG. 9 are explanatory views showing a clamper support structure according to this embodiment. In any figure, the direction of arrow G is the direction of action of gravity. In this example, the lid 2 corresponds to a housing. As shown in FIG. 8B, the clamper support member 20 that is a disk holding means support portion is a cylindrical member and is attached to the lid 2. On the side opposite to the side where the clamper support member 20 is attached to the lid 2, a support hole 20 h is opened.

  As shown in FIG. 8 (b), the clamper 3 has a flange portion 3 f on the outer peripheral portion, and is stored in a cylindrical clamper support member 20. In addition, as shown in FIG.8 (c), you may comprise the clamper support member 21 with the cylindrical-shaped member of planar view. When in the standby state, that is, when the clamper 3 is not holding the disk 10, the flange outer periphery (corresponding to the outer periphery of the disk holding means) 3fo of the clamper 3 and the inner periphery 20i of the clamper support member 20 are Contact at least partly. As a result, the clamper support member 20 supports the clamper 3.

In the state shown in FIGS. 8A and 8B, the distance from the rotation center axis Z of the disk 10 to the inner peripheral portion 20i of the clamper support member 20 is l ₁ and the radius of the clamper 3 is r ₃ . In this case, the maximum size of the difference rc between the distance l ₁ and the radius r ₃ is set so that the clamper 3 is moved to the inside of the positioning recess 4 h provided on the disk holding boss 4 side when the disk 10 is held. That is, the outside of the positioning convex portion 3t is in contact. More preferably, the size of the rc is such that the positioning projection 3t smoothly enters the positioning recess 4h when the disk 10 is held.

FIG. 9 shows a state in which the disk 10 is held by the clamper support structure shown in FIGS. 8A and 8B. As described above, according to the clamper support structure shown in FIGS. 8A, 8B, etc., the clamper support member 20 and the disc table 3 can be used by the clamper support member 20, even if the thickness h of the clamper 3 is not increased. The deviation from 5 can be maintained within an allowable range. As a result, the distance t ₃ between the clamper support member 20 and the disk 10 does not become larger than necessary. As a result, the time to read the information by holding the disc 10 and the distance t ₁ between the lid 2 is the clamper 3 and the housing, and the distance t ₂ of the clamper 3 and the clamper support member 20, the clamper supporting member 20 And the distance t ₃ between the disk 10 and the disk 10 can be set to be substantially equal.

As a result, the height of the disk device can be reduced, and the acceleration resistance limit in this direction can be sufficiently secured. In addition, since the clamper 3 is supported by the clamper support member 20, the support hole 20 h provided in the clamper support member 20 is not involved in supporting the clamper 3. Then, the inner peripheral portion of the clamper 3 and the clamper support member 20, or since the clearance t ₄ between the clamper 3 and the supporting hole 20h can be sufficiently ensured, sufficient resistance to the speed limit in a direction orthogonal to the rotation axis Z is also it can.

  FIG. 10 is an explanatory view showing another clamper support structure according to this embodiment. In this example, as shown in FIG. 10, the clamper 3 a includes an inclined portion 3 s and the outer shape is a substantially truncated cone shape. As shown in FIG. 10, the clamper 3 a is disposed inside the clamper support member 20, and the inclined portion 3 s contacts the support hole 20 h of the clamper support member 20. This prevents the clamper 3a from falling out of the clamper support member 20.

  The outer peripheral portion 3ao of the clamper 3a may be supported by the inner peripheral portion 20i of the clamper support member 20. In this way, since it is not necessary to provide the flange portion on the clamper 3a, the manufacture of the clamper 3a is facilitated and the material used for manufacturing the clamper 3a can be reduced. Further, when the disk device is placed horizontally, when the clamper 3 does not support the disk 10, the clamper 3 is pressed against the support hole 20h by the weight of the clamper 3. At this time, since the inclined portion 3s is pressed against the support hole 20h, the center axis Zc of the clamper 3 coincides with the center axis Zg of the support hole 20h. As a result, when the disk table 5 holds the disk 10, the disk table 5 and the clamper 3a can be easily centered.

As described above, in this embodiment, when information is read from the disk or when information is recorded on the disk, the distance t ₁ between the disk holding means and the housing, and the distance between the disk holding means and the disk holding means support portion. t ₂ and the distance t ₃ between the disk holding means supporting portion and the disk are made substantially equal. As a result, the acceleration resistance limit when the disk comes into contact with the disk holding means support portion or when the disk holding means comes into contact with the housing can be made substantially equal. As a result, a sufficient acceleration resistance limit of the disk device can be secured, and the height of the disk device can be reduced.

Further, the disk holding means is disposed inside the cylindrical disk holding means supporting portion, and at least a part of the outer peripheral portion of the disk holding means and the inner peripheral portion of the disk holding means supporting portion are brought into contact with each other, so that the disk holding means is To support. As a result, when the disk device is placed vertically, the support hole provided in the disk holding means support portion does not participate in supporting the disk holding means. As a result, the gap t ₄ between the disk holding means and the support hole can be sufficiently secured, and therefore, the acceleration resistance limit in the direction orthogonal to the rotation center axis Z of the disk can be sufficiently secured.

1 is an overall view showing a disk device according to this embodiment. 1 is an overall view showing a state in which a case body of a disk device according to this embodiment is removed. It is the schematic which shows the internal structure of the disc apparatus concerning this embodiment. It is an enlarged view showing a disk holding state of the disk device according to this embodiment. It is a top view which shows the relationship between the clamper which concerns on this embodiment, and the support hole of a cover body. It is explanatory drawing which shows the disk holding | maintenance state at the time of placing a disk apparatus vertically. It is explanatory drawing which shows the disk holding | maintenance state at the time of placing a disk apparatus vertically. It is explanatory drawing which shows the clamper support structure which concerns on this embodiment. It is explanatory drawing which shows the clamper support structure which concerns on this embodiment. It is explanatory drawing which shows the clamper support structure which concerns on this embodiment. It is explanatory drawing which shows the clamper support structure which concerns on this embodiment. It is explanatory drawing which shows the support structure of the other clamper based on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Frame body 2 Cover body 2h Support hole 2s Disc holding means support part 3, 3a, 3x Clamper 3f Flange part 3s Inclined part 3ao Outer part 4 Disc holding boss 5 Disc table 6 Electric motor 7 Pickup 9 Disc tray 10 Disc 11 Case body 20, 21 Clamper support member 20h Support hole 20i Inner periphery 100 Disk device 101 Device body

Claims (3)

A disk holding means for holding the disk during rotation and rotating together with the disk;
When the disk holding means does not hold the disk, a disk holding means support portion for supporting the disk holding means at a fixed position;
A housing for storing the disk holding means and the disk holding means support portion;
When reading information from the disc, or when recording information on the disc,
The distance between the disk holding means and the housing, the distance between the disk holding means and the disk holding means support, and the distance between the disk holding means support and the disk are substantially equal. apparatus. The disk holding means supporting portion is a cylindrical member, and the disk holding means is provided therein,
When the disc holding means is not holding the disc, the inner peripheral portion of the disc holding means supporting portion and the outer peripheral portion of the disc holding means are at least partially in contact with each other, and the disc holding means supporting portion is The disk device according to claim 1, wherein the disk holding unit is supported.   The outer shape of the disk holding means is substantially frustoconical, and the inclined portion of the disk holding means is formed so as to contact a support hole provided in the disk holding means support portion. The disk device described.

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