JP2013004119A - Disk device and clamp mechanism - Google Patents

Abstract

The present invention provides a disk device capable of suppressing intrusion of dust into the disk device.
A disk device includes a turntable that rotates while holding a disk, a clamper that holds the disk between the turntable, a clamper, and the turntable. And an optical head for recording or reproducing information on the disk 11 to be recorded. The clamper 60 has a protrusion (protrusion) 62 on the surface opposite to the surface facing the disk 11 that resists air flow from the center of the disk 11 to the outer periphery caused by the rotation of the disk 11. is doing.
[Selection] Figure 6

Description

  The present invention relates to a disk device that records or reproduces information on a disk, and more particularly to a clamp mechanism that holds a disk rotatably.

  In a disk device, in order to record or reproduce information stably, it is necessary to prevent dust from adhering to the recording surface of the disk (medium) and the optical pickup.

  Here, in recent years, with an increase in capacity of a disc, the track pitch of the disc (the interval between adjacent recording tracks) tends to become narrower. For example, a CD (Compact Disc) has a track pitch of 1.6 μm, whereas a DVD (Digital Versatile Disc) has a track pitch narrowed to 0.74 μm, and a BD (Blu-ray Disc) further has 0. It is narrowed to 32μm. Thus, the narrower the track pitch, the more easily the reproduction performance of the disk device is affected by dust.

  In the disk device, when the disk rotates, an air flow from the center of the disk toward the outer periphery is generated near the surface of the disk. Therefore, if an opening is provided near the center of the disk of the housing of the disk device, air may flow into the disk device from the opening and dust may enter along with the air. When dust enters the disk device in this way, the dust adheres to the disk or the lens of the optical pickup, which causes a reduction in reproduction performance.

  In order to prevent the dust from adhering to the disc, a technique has been proposed in which fins are provided on the outer periphery of the turntable and the dust adhering to the recording surface is removed by blowing air to the recording surface of the disc (for example, Patent Document 1). reference).

JP 2002-56663 A (paragraph 0026, FIG. 4, FIG. 5)

  However, in the conventional disk device described above, since the intrusion of dust into the disk device cannot be suppressed, even if the dust attached to the recording surface of the disk is removed by blowing, it adheres again to the recording surface of the disk, or the optical pickup. There is a possibility to adhere to.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a disk device capable of suppressing entry of dust into the disk device.

  The disc device according to the present invention is a turntable that holds and rotates a disc, a rotatable clamper that clamps the disc between the turntable, and a disc that is clamped and rotated by the clamper and the turntable. The clamper is provided with a head for recording or reproducing information, and the clamper is provided on a surface opposite to the surface facing the disk, and serves as a resistance against the air flow from the center of the disk toward the outer periphery caused by the rotation of the disk. It has the part.

  According to the present invention, the protrusion of the clamper can disturb the air flow from the center of the disk to the outer periphery, and as a result, the flow rate of air flowing into the disk device from the opening of the disk device can be reduced. This can reduce the intrusion of dust into the disk device.

It is the perspective view which looked at the disk apparatus in Embodiment 1 of this invention from upper direction. It is the perspective view which looked at the recording / reproducing unit of the disc apparatus in Embodiment 1 of this invention from the upper direction. It is the perspective view which looked at the recording / reproducing unit of the disc apparatus in Embodiment 1 of this invention from the downward direction. It is a perspective view which removes a clamp plate and shows the recording / reproducing unit of the disk apparatus in Embodiment 1 of this invention. It is a perspective view which shows the clamper in Embodiment 1 of this invention. It is sectional drawing which shows the clamp mechanism of the disc apparatus in Embodiment 1 of this invention. It is a figure which shows the flow of the air at the time of disk rotation. It is a figure which shows the other structural example of the convex part of the clamper of Embodiment 1 of this invention. It is a perspective view which shows the other structural example of the clamper of Embodiment 1 of this invention. It is sectional drawing which shows the clamp mechanism containing the clamper in Embodiment 2 of this invention. It is sectional drawing for demonstrating the curved surface of the clamper in Embodiment 2 of this invention. It is sectional drawing which shows the other structural example of the clamper in Embodiment 2 of this invention. It is a perspective view which shows the clamper in Embodiment 3 of this invention. It is a top view which shows the clamper in Embodiment 3 of this invention. It is a top view which shows the other structural example of the clamper in Embodiment 3 of this invention. It is sectional drawing which shows the modification of each embodiment of this invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of a disk device 10 according to Embodiment 1 as viewed from above. FIG. 2 is a perspective view of the recording / reproducing unit 20 of the disk device 10 as viewed from above. FIG. 3 is a perspective view of the recording / reproducing unit 20 as viewed from below. FIG. 4 is a perspective view showing the recording / reproducing unit 20 with the clamp mechanism removed.

  A disk device 10 shown in FIG. 1 includes a housing 12 and a recording / reproducing unit 20 (FIG. 2) accommodated in the housing 12. The recording / reproducing unit 20 includes an optical head 53 (FIG. 3), and records and / or reproduces information on the disk 11 (or both). Here, a case where information recorded on the disk 11 is reproduced will be described. The disk 11 is a CD, DVD, or BD, but may be another type of disk.

  In FIG. 1, the direction of the rotation axis of the disk 11 is a Z direction. On the surface (XY surface) orthogonal to the Z direction, the direction of the rotation axis of the clamp plate 58 described later is defined as the X direction. A direction orthogonal to both the X direction and the Z direction is defined as a Y direction. The direction from the optical head 53 toward the disk 11 along the Z direction is defined as + Z direction (upward), and the opposite direction is defined as -Z direction (downward). Further, the + Z direction surface (upper surface) of the disk 11 is a label surface, and the −Z direction surface (lower surface) is a recording surface.

  The recording / reproducing unit 20 has a support base 54 as shown in FIG. The support base 54 is a substantially plate-like member parallel to the XY plane. A plurality of (for example, three) damper pins 31 (FIG. 4) are press-fitted into the support base 54 from below. The damper pins 31 are held by a plurality of (for example, three) oil-filled dampers 32 attached to the bottom plate of the housing 12, whereby the support base 54 is held in the housing 12.

  As shown in FIG. 4, in the vicinity of one end portion of the support base 54 in the Y direction, a turntable 57 that holds the disk 11 as a center and rotates around the rotation axis in the Z direction is disposed. The turntable 57 is provided on a rotating shaft of a disk type motor 52a provided on the circuit board 52, and rotates in the same phase as the disk type motor 52a. The support base 54 is also provided with an optical head 53 mounted with an optical pickup 53a that moves along the recording surface (the −Z side surface) of the disk 11 and reads information on the disk 11.

  As shown in FIG. 3, in order to move the optical head 53, the support base 54 is moved from the vicinity of the turntable 57 to the base end of the support base 54 (the end opposite to the end where the turntable 57 is provided). ), And a guide shaft 42 is provided in parallel with the feed screw 41. The optical head 53 includes a nut portion 53 b that is screwed with the feed screw 41 and a guided portion 53 c that is engaged with the guide shaft 42. When the feed screw 41 is rotated by a motor 44 (described later), the optical head 53 moves along the guide shaft 42 (that is, along the recording surface of the disk 11) by screwing the feed screw 41 and the nut portion 53b.

  A motor support member 43 is attached to the support base 54 adjacent to the turntable 57. The motor support member 43 is provided with a motor 44 for rotating the feed screw 41 and a gear train 45 for transmitting the driving force of the motor 44 to the feed screw 41. Further, a cover 46 is fitted to the support member 43 to prevent the gear train 45 from coming off.

  In the support base 54, an information reading window 54 d that is an opening is formed in a portion corresponding to the movement range of the optical head 53. Further, on both sides in the X direction of the support base 54, bent pieces 54c that are bent in the + Z direction (upward) are formed. A support hole 54e for rotatably supporting a clamp plate 58 described below is formed at the end in the Y direction (the end opposite to the turntable 57) of each bent piece 54c.

  As shown in FIG. 2, a clamp plate 58 (also referred to as a clamper arm) is provided above the support base 54 (+ Z direction). Bending pieces 58b bent in the −Z direction (downward) are formed on both sides in the X direction of the clamp plate 58, and each bending piece 58b has a shaft portion that engages with the support hole 54e of the support base 54. 58a is formed. Thereby, the clamp plate 58 is supported by the support base 54 so as to be rotatable about the rotation axis in the X direction.

  Next, a clamp mechanism that holds the disk 11 rotatably in the recording / reproducing unit 20 will be described. As shown in FIG. 2, the clamp plate 58 has a rotation shaft (shaft portion 58a) at one end in the Y direction, and a clamper 60 that presses and holds the disk 11 against the turntable 57 at the other end in the Y direction. keeping. The clamper 60 is rotatably attached to the clamp plate 58 and rotates together with the disc 11 pressed against the turntable 57.

  The clamp plate 58 is attached in a direction (indicated by an arrow B in FIG. 1) in which the clamper 60 is pressed against the turntable 57 by a tension coil spring 59 (FIG. 3) provided at the end of the support base 54. It is energized.

  When releasing the clamp of the disk 11, the clamp plate 58 is rotated in the direction opposite to the arrow B around the shaft portion 58 a by a drive mechanism (not shown), and the clamper 60 is moved upward from the turntable 57 (+ Z Direction). At this time, an opening 12 a having a shape that does not interfere with the clamp plate 58 is formed in the top plate of the housing 12 so that the clamp plate 58 does not interfere with the housing 12.

  In this specification, a mechanism having the clamper 60 and the turntable 57 and holding the disk 11 so as to be rotatable is referred to as a clamp mechanism.

  FIG. 5 is a perspective view showing the shape of the clamper 60 in the first embodiment. FIG. 6 is a cross-sectional view showing a clamping mechanism including the clamper 60 in the first embodiment. As shown in FIG. 6, an annular contact portion 61 that contacts the clamp region 11 a of the disk 11 is provided in the vicinity of the outer periphery of the −Z side surface (the surface facing the disk 11) of the clamper 60.

  The clamp area 11a of the disk 11 is an area provided on the inner circumference side of the recording area of the disk 11. For example, in the case of a CD, the diameter is 26 mm to 33 mm, and in the case of a DVD, the diameter is 22 mm to 33 mm. In this case, the region has a diameter of 23.5 mm to 32.5 mm. The contact portion 61 of the clamper 60 and the turntable 57 sandwich and hold the clamp area 11a of the disk 11 up and down.

  As shown in FIG. 5, at the center of the + Z side surface of the clamper 60 (the surface opposite to the surface facing the disk 11), there is a rotation support portion 63 that is rotatably held by the clamp plate 58 described above. Is provided.

  Further, a cylindrical convex portion 62 (protruding portion) is formed near the outer periphery of the + Z side surface of the clamper 60. More specifically, a plurality (eight in this case) of cylindrical protrusions 62 are arranged at equal intervals along the circumference centering on the rotation axis A of the clamper 60 (that is, in the rotation circumferential direction). ing. The convex portion 62 is formed at a height that does not interfere with the clamp plate 58 when the disk 11 rotates.

  Here, the outer diameter of the convex part 62 is 3 mm, for example, and the height is 1.5 mm, for example. Further, a gap of about 3.5 mm is formed between the top surface of the clamper 60 (excluding the convex portion 62) and the bottom surface of the clamp plate 58.

  At the time of disk reproduction, as shown in FIG. 6, the clamper 60 and the turntable 57 sandwich the clamp area 11a of the disk 11, and the disk type motor 52a (FIG. 4) rotates in this state. The turntable 57 rotates in the same phase as the disk type motor 52a, and the disk 11 rotates in the same phase as the disk type motor 52a together with the clamper 60. The disk-type motor 52a rotates at a rotation speed corresponding to the track pitch of the disk 11, and the recording information on the disk 11 is read by the optical head 53 (FIG. 4) facing the recording surface of the disk 11.

  FIG. 7 is a schematic diagram showing an example of the air flow generated near the surface of the disk 11 as the disk 11 rotates. When the disk 11 rotates about the rotation axis A in the Z direction, an air flow from the center of the disk 11 toward the outer periphery is generated near the surface of the disk 11 as shown in FIG.

  Since the opening 12a (FIG. 1) is formed in the top plate of the housing 12 of the disk device 10, when the air flow from the center of the disk 11 to the outer periphery as shown in FIG. In the vicinity, air may flow into the housing 12 from the opening 12a, and dust may enter the housing 12 along with this.

  Therefore, in the present embodiment, the cylindrical convex portion 62 is provided on the upper surface of the clamper 60 (the surface opposite to the surface facing the disk 11). When the clamper 60 rotates, the cylindrical convex portion 62 formed on the clamper 60 also rotates, so that the convex portion 62 becomes a resistance against the air flow from the center of the disk 11 to the outer periphery (FIG. 7). The air flow is disturbed. Thereby, the flow volume of the air which flows into the inside of the housing | casing 12 from the opening part 12a can be reduced, and the penetration | invasion into the housing 12 of dust can be suppressed.

  In addition, since the peripheral speed of the clamper 60 is higher on the outer peripheral side, forming the convex portion 62 near the outer periphery of the clamper 60 increases the effect of causing disturbance in the air flow from the center of the disk 11 toward the outer periphery. Therefore, the effect of reducing the flow rate of air flowing into the housing 12 from the opening 12a is increased, and thus the effect of suppressing the intrusion of dust into the housing 12 is increased.

  In addition, since a plurality (eight in this case) of the convex portions 62 are arranged at equal intervals in the rotation circumferential direction of the clamper 60, the balance of the clamper 60 can be kept good, whereby the disk 11 is An increase in the load of the disk type motor 52a to be rotated can be suppressed.

  Moreover, since the convex part 62 is a cylinder shape which does not have an edge in a side surface (outer peripheral surface), generation | occurrence | production of the noise by air passing an edge can be suppressed.

  Furthermore, since only the protrusions 62 are provided on the clamper 60 and no other components need be added to the clamping mechanism, the effect of suppressing the intrusion of dust into the disk device 10 can be realized with a simple configuration. be able to.

  As described above, according to the first embodiment, the convex portion 62 that resists the flow of air generated by the rotation of the disk 11 is provided on the surface of the clamper 60 opposite to the surface facing the disk 11. By providing the turbulence, the flow of air from the center of the disk 11 toward the outer periphery is disturbed, and the flow rate of air flowing into the housing 12 from the hole 12a can be reduced. Therefore, the intrusion of dust into the housing 12 can be suppressed.

  In addition, although the case where the clamper 60 has the cylindrical convex portion 62 has been described here, other shapes are also possible. However, in the case of a shape having an edge on the side surface such as a quadrangular column, noise is generated due to air passing through the edge as described above. Therefore, the side surface (outer peripheral surface) is preferably a curved surface.

  Further, as shown in FIG. 8A, a curved surface (R) may be formed at the boundary portion between the side surface (outer peripheral surface) 62a and the upper surface 62b of the convex portion 62, and as shown in FIG. 8B. As described above, the upper surface 62b of the convex portion 62 may be formed in a curved shape such as a hemisphere. Thus, noise can further be suppressed by making the convex part 62 into the shape which does not have an edge.

  Moreover, as shown to FIG. 9 (A), the convex part 62 may have a taper (inclination) in the outer peripheral surface 62a so that an outer diameter may become small in + Z direction. By providing such a taper, the flow of air in the + Z direction increases, so that the effect of reducing the flow rate of air flowing into the housing 12 from the opening 12a is increased. The effect of suppressing intrusion is increased.

  Here, the eight columnar convex portions 62 are arranged at equal intervals, but the number is not limited to eight. However, in order to sufficiently reduce the flow rate of air flowing into the housing 12 from the opening 12a, it is preferable to arrange three or more convex portions 62 at equal intervals.

  Moreover, although the convex part 62 of the clamper 60 is preferably formed in the vicinity of the outer periphery of the clamper 60, it is not limited to this. Further, for example, as shown in FIG. 9B, three or more protrusions are arranged at equal intervals on the circumference centering on the rotation axis A of the clamper 60 inside the protrusions 62 in the vicinity of the outer periphery of the clamper 60. If the part is added, the effect of reducing the flow rate of the air flowing into the inside of the housing 12 is further increased.

Embodiment 2. FIG.
FIG. 10 is a cross-sectional view showing a clamp mechanism including the clamper 70 of the disk device according to the second embodiment. Constituent elements similar to those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 10, the + Z side surface (the surface opposite to the surface facing the disk 11) of the clamper 70 in the second embodiment is concave except for the rotation support portion 73 supported by the clamp plate 58. The curved surface 72 is configured. The curved surface 72 is a rotationally symmetric curved surface around the rotation axis A of the clamper 70.

  FIG. 11 is a diagram for explaining the shape of the curved surface 72 of the clamper 70. The curved surface 72 is a spherical surface centered on an arbitrary point P located on the + Z side of the clamper 70 and on the rotation axis A of the clamper 70. Here, the radius of the sphere is 120 mm, for example. Other configurations are the same as those in the first embodiment.

  At the time of disk reproduction, as shown in FIG. 10, the clamper 70 and the turntable 57 sandwich the clamp area 11a of the disk 11, and the disk type motor 52a (FIG. 4) rotates in this state. The turntable 57 rotates in the same phase as the disk type motor 52a, and the disk 11 rotates together with the clamper 70 in the same phase as the disk type motor 52a. The disk-type motor 52a rotates at a rotation speed corresponding to the track pitch of the disk 11, and the recording information on the disk 11 is read by the optical head 53 (FIG. 4) facing the recording surface of the disk 11.

  When the disk 11 rotates, an air flow from the center of the disk 11 toward the outer periphery tends to be formed as described in the first embodiment, but the clamper 70 has a concave curved surface 72, and the outer peripheral side is closer to the outer periphery side. Since the height (the amount of protrusion in the + Z direction) increases, an air flow toward the + Z direction can be generated. As a result, the air flow from the center of the disk 11 toward the outer periphery is disturbed, and the flow rate of air flowing from the hole 12a into the housing 12 can be reduced.

  As described above, according to the second embodiment, by providing the concave curved surface 72 on the surface of the clamper 70 opposite to the surface facing the disk 11, the flow of air generated by the rotation of the disk 11 can be reduced. Disturbance can be caused and the flow rate of air flowing into the housing 12 from the hole 12a can be reduced. As a result, the intrusion of dust into the housing 12 can be suppressed.

  In particular, since the curved surface 72 is a spherical surface centered at an arbitrary point P located on the rotation axis of the clamper 70 on the + Z side of the clamper 70, processing is easy and noise is not caused because there is no discontinuous portion. Can be suppressed.

  FIG. 12 is a cross-sectional view showing another configuration example of the clamper 70 according to the second embodiment. In the configuration example shown in FIG. 12, the curved surface 72 has a short axis on the Z axis, and the lower side of the rotating body surface obtained by rotating an ellipse having a long axis in a direction perpendicular to the Z axis around the Z axis. (-Z side) It consists of half. Since the curved surface 72 has such a shape, the air flow from the center of the disk 11 toward the outer periphery can be disturbed, and the flow rate of air flowing from the opening 12a of the housing 12 can be reduced. . In addition, since the moment of inertia of the clamper 70 can be reduced as compared with the spherical shape shown in FIGS. 10 and 11, the load on the disk type motor 52a can be reduced.

  The curved surface 72 of the clamper 70 is not limited to the above-described spherical shape (FIGS. 10 and 11) or a shape obtained by rotating an ellipse (FIG. 12), but may be another concave curved surface, for example, a conical surface. . However, the above-mentioned spherical shape and the like (FIGS. 10 to 12) are advantageous in that the angle (gradient) becomes steeper toward the outer peripheral side, so that the effect of generating an air flow toward the + Z direction is great.

Embodiment 3 FIG.
13 and 14 are a perspective view and a plan view showing the structure of the clamper of the disk device according to the third embodiment. The same components as those described in the first or second embodiment are denoted by the same reference numerals.

  As shown in FIG. 13, the clamper 80 according to the third embodiment has a plurality of ribs 82 (protruding portions) on the + Z side surface (the surface opposite to the surface facing the disk 11). Here, eight ribs 82 are arranged at equal intervals in the circumferential direction of the clamper 80. Each rib 82 extends (more preferably, substantially radially) so as to intersect the rotational circumferential direction of the clamper 80. More specifically, the rib 82 extends to a predetermined length from the vicinity of the outer periphery of the clamper 80 toward the inner periphery, and has end faces 82a and 82b on the inner periphery side and the outer periphery side, respectively. The rib 82 is formed at a height that does not interfere with the clamp plate 58 when the disk 11 rotates.

  As shown in the plan view of FIG. 14, the front surface 82 d of the rib 82 in the rotation direction (R direction) of the clamper 80 is formed so as to precede the rotation direction (R direction) of the clamper 80 as it approaches the outer periphery of the clamper 80. Has been. In other words, a line segment T is defined along the front surface 82d of the rib 82, and a point where an extension line of the line segment T intersects the outer periphery of the clamper 80 is defined as S, and a tangent line of the outer periphery of the clamper 80 at this point S is defined as S. Assuming Q, the rib 82 is formed so that the angle D formed by the line segment T and the tangent line Q becomes an obtuse angle (> 90 °).

  In FIG. 13, the length L of the rib 82 is, for example, 7 mm, the width W is, for example, 1.5 mm, and the height H is, for example, 1 mm. In addition, it is preferable to form a curved surface at the edge of the front surface 82d of the rotation direction of the disk 11 of the rib 82, and noise during rotation of the clamper 80 can be reduced.

  During disk reproduction, the clamper 80 and the turntable 57 sandwich the clamp area 11a of the disk 11, and the disk-type motor 52a (FIG. 4) rotates in this state. The turntable 57 rotates in the same phase as the disk type motor 52a, and the disk 11 rotates together with the clamper 80 in the same phase as the disk type motor 52a. The disk-type motor 52a rotates at a rotation speed corresponding to the track pitch of the disk 11, and the recording information on the disk 11 is read by the optical head 53 (FIG. 4) facing the recording surface of the disk 11.

  When the disk 11 rotates, an air flow from the center of the disk 11 to the outer periphery is formed as described in the first embodiment (see FIG. 7), but the rib 82 of the clamper 80 also rotates at the same time. The ribs 82 are resistant to the air flow from the center of the disk 11 toward the outer periphery, causing disturbance in the air flow. As a result, the flow rate of air flowing into the housing 12 from the hole 12a can be reduced, and the intrusion of dust accompanying the inflow of air into the housing 12 can be suppressed.

  Further, the front surface 82d of the rib 82 in the rotation direction (R direction) of the clamper 80 is formed so as to precede the rotation direction (R direction) of the clamper 80 as it approaches the outer periphery of the clamper 80 (that is, the line described above). Since the angle D formed by the minute T and the tangent line Q is an obtuse angle), the resistance to the air flow from the center of the disk 11 toward the outer periphery is large, and thus the effect of causing disturbance in the air flow is great. As a result, the flow rate of air flowing into the housing 12 from the opening 12a of the housing 12 can be further reduced, and dust can be more effectively prevented from entering.

  Further, as described in the first embodiment, the peripheral speed of the clamper 80 is faster toward the outer periphery. Therefore, the rib 82 is formed in the vicinity of the outer periphery of the clamper 80 so that the air flows from the center of the disk 11 toward the outer periphery. The effect of causing disturbance is increased.

  In addition, since a plurality of (here, eight) ribs 82 are arranged at equal intervals in the rotation circumferential direction of the clamper 80, the balance of the clamper 80 can be kept good. Therefore, an increase in the load of the disk type motor 52a that rotates the disk 11 can be suppressed. Although eight ribs 82 are provided here, the number is not limited to eight. However, in order to sufficiently reduce the flow rate of air flowing into the housing 12 from the opening 12a, it is preferable to arrange three or more ribs 82 at equal intervals.

  As described above, according to the third embodiment, the rib 82 that resists the air flow generated by the rotation of the disk 11 is provided on the surface of the clamper 80 opposite to the surface facing the disk 11. By providing, the air flow from the center of the disk 11 toward the outer periphery is disturbed, and the flow rate of air flowing from the hole 12a into the housing 12 can be reduced. As a result, the intrusion of dust into the housing 12 can be suppressed.

  FIG. 15 is a perspective view illustrating another configuration example of the rib 82 according to the third embodiment. In the modification shown in FIG. 15, the front surface 82d of the rib 82 in the rotation direction (R direction) of the clamper 80 is such that the width W of the rib 82 becomes narrower as it moves away from the clamper 80 (ie, in the + Z direction). (Tilt). By providing such a taper 85, in addition to increasing resistance to the air flow from the center of the disk 11 toward the outer periphery, it is possible to generate an air flow in the + Z direction along the taper 85. As a result, the flow rate of the air flowing into the housing 12 from the opening 12a of the housing 12 can be more effectively reduced, and dust can be prevented from entering.

The present invention is not limited to the above-described first to third embodiments, and can be modified as appropriate.
For example, in the first to third embodiments described above, the clampers 60, 70, and 80 sandwich the clamp area 11 a on the inner peripheral side of the disk 11 with the turntable 57. However, since the clampers 60, 70, and 80 are in contact with the label surface opposite to the recording surface (lower surface) of the disk 11, even if the clampers 60, 70, and 80 are in contact with the outer peripheral side of the clamp area 11a, the information There is no effect on reading.

  Therefore, the diameters of the clampers 60, 70, and 80 may be increased so that the clampers 60, 70, and 80 are also in contact with a region on the outer peripheral side of the clamp region 11a of the disk 11. FIG. 16 shows a modified example in which the diameter of the clamper 60 in the first embodiment is enlarged as an example. If the convex portion 62 is provided in the vicinity of the outer periphery of the clamper 60 having an enlarged diameter in this way, the flow rate of air flowing into the housing 12 from the opening 12a is more effectively reduced, and dust intrusion is more effective. Can be suppressed. The same applies to the clampers 70 and 80 of the second and third embodiments.

  The present invention can be applied to, for example, a disk device (for example, an in-vehicle disk device) that records and / or reproduces information on a disk.

10 disk device, 11 disk, 11a clamp area, 12 housing, 12a hole, 20 recording / reproducing unit, 31 damper pin, 32 damper, 53 optical head (head), 54 support base, 54d reading window, 54e hole, 57 turntable 58 clamp plate, 58a shaft, 58d bent piece, 59 tension coil spring, 52 circuit board, 52a disk type motor, 53 reading means, 41 feed screw shaft, 42 guide shaft, 43 support member, 44 motor, 45 gear train, 46 cover, 60 clamper, 62 convex part (projection part), 63 rotation support part, 70 clamper, 72 curved surface, 73 rotation support part, 80 clamper, 82 rib (projection part), 82d front face, 83 rotation support part, 85 taper .

Claims (17)

A turntable that rotates while holding a disc,
A rotatable clamper that sandwiches the disk with the turntable;
A head for recording or reproducing information with respect to the disk that is sandwiched and rotated by the clamper and the turntable;
The clamper has, on a surface opposite to the surface facing the disk, a protrusion that resists air flow from the center of the disk toward the outer periphery generated by the rotation of the disk. Disk unit.   The disk device according to claim 1, wherein the protruding portion is disposed near an outer periphery of the clamper.   3. The disk device according to claim 1, wherein the plurality of protrusions are arranged at equal intervals in a rotation circumferential direction of the clamper.   4. The disk device according to claim 1, wherein the protruding portion has a substantially cylindrical shape. 5.   The disk device according to claim 4, wherein the protruding portion has a curved surface at a tip in a protruding direction.   6. The disk device according to claim 1, wherein the protruding portion has a shape with an outer diameter that decreases in the protruding direction. 7.   The disk device according to claim 1, wherein a concave curved surface is formed on a surface of the clamper opposite to the surface facing the disk.   The disk device according to claim 7, wherein the concave curved surface of the clamper is a rotating body surface centered on a rotation axis of the clamper.   The disk device according to claim 8, wherein the concave curved surface of the clamper is a spherical surface having a center on a rotation axis of the clamper.   The concave curved surface of the clamper has a minor axis on the rotation axis of the clamper, and a rotating body surface obtained by rotating an ellipse having a major axis in a direction perpendicular to the rotation axis about the rotation axis of the clamper. The disk device according to claim 8, wherein   The disk apparatus according to claim 1, wherein the protrusion is a rib extending so as to intersect with a rotation circumferential direction of the clamper.   The disk apparatus according to claim 11, wherein the rib extends from the vicinity of the outer periphery of the clamper to an inner peripheral side with a predetermined length.   The disk device according to claim 11 or 12, wherein the plurality of ribs are arranged at equal intervals in a rotation circumferential direction of the clamper.   The front surface of the rib in the rotation direction of the clamper is formed so as to precede the rotation direction of the clamper as it approaches the outer periphery of the clamper. The disk device described in 1.   15. The front surface of the rib in the rotational direction of the clamper has an inclination such that the width of the rib decreases as it proceeds in the protruding direction of the rib. Disk unit.   The disk apparatus according to any one of claims 1 to 15, wherein the clamper is configured to come into contact with an area on an outer peripheral side of a clamp area of the disk. A turntable that rotates while holding a disc,
A clamp mechanism comprising: a rotatable clamper that sandwiches the disk with the turntable;
The clamper has, on a surface opposite to the surface facing the disk, a protrusion that resists air flow from the center of the disk toward the outer periphery generated by the rotation of the disk. Disk unit.

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