JPH10261260A - Disk clamping mechanism of optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk clamping mechanism whose end surface of a rotor does not come into contact with the upper surface of a stator substrate when the disk is not being placed on a turntable in the state a motor is incorporated in the disk clamping member for driving the rotation. SOLUTION: A gap A' is secured between the end surface 50a of the rotor 50 and the upper surface 64a of the stator substrate 64 providing a protrusion 50c between the lower surface 50b of the rotor 50 and an iron core 63 as a rotor position set means for setting the position of the rotor to the direction of height. In this case, the end surface 50a of the rotor 50 does not bring into contact with the upper surface 64a of the stator substrate 64, even though the disk is repeatedly clamped by loading/unloading the disk 4 in the state when the disk 4 is not placed on the turntable 7. The disk clamping mechanism such as the peeling and disconnection of a printed circuit pattern formed on the upper surface 64a of the stator substrate 64 are eliminated, is provided accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk clamp mechanism of an optical disk reproducing apparatus for recording and reproducing information by rotating a disk medium such as a so-called DVD (digital video disk) at a high speed, and more particularly to a disk clamp mechanism. And the clearance between the rotor and the stator substrate in the rotary drive motor that constitutes the above.

[0002]

2. Description of the Related Art In recent years, such a recording / reproducing apparatus has been used as a CD-RO as a disk medium as a computer auxiliary storage device.
As the demand for M increases, it is required to rotate a CD-ROM at a high speed in order to cope with high-density recording and reproduction of information. The commercial value of CD-ROMs is supported by the speeding up of disk drives, and CD-ROM drives with faster data transfer speeds and access times than ever have been awarded.

In a CD-ROM drive, the rotational speed of the disk is about 200 rpm at the standard speed with respect to the outermost circumference of the disk, and at most about 530 rpm with respect to the innermost circumference of the disk.
pm, and the difference between the inner and outer circumferences of the disk is only about 330 rpm. However, the rotational drive of the disk is one of the standard speed.
At 12x speed, which is doubled, the number of revolutions is at least about 2400
From rpm to a maximum of about 6360 rpm, the difference between the inner and outer circumferences of the disc also increases 12 times.

Further, since the moment of inertia due to the rotation of the disk is the same irrespective of the rotation speed of the disk, if the drive torque of the disk rotation drive motor is constant regardless of the rotation speed of the disk, the adjustment time of the rotation speed, that is, The access time from when the pickup moves between the inner and outer circumferences of the disk and when the rotation speed is set to an appropriate value for reproducing the disk at a predetermined position is 12 times.

However, at a 12-times speed at which the rotational drive of the disk is 12 times the standard speed, the rotation speed is at least about 240
From 0 rpm to a maximum of about 6360 rpm, the difference between the inner and outer circumferences of the disk also increases 12 times.

Further, since the moment of inertia due to the rotation of the disk is the same irrespective of the rotation speed of the disk, if the drive torque of the disk rotation drive motor is constant regardless of the rotation speed of the disk, the adjustment time of the rotation speed, that is, The access time from when the pickup moves between the inner and outer circumferences of the disk and when the rotation speed is set to an appropriate value for reproducing the disk at a predetermined position is 12 times.

However, in general, the drive torque of the disk rotation drive motor decreases as it rotates in a high rotation range, so that the actual access time becomes a value 12 times or more.
Therefore, in order to shorten the access time of the CD-ROM drive, it is necessary to increase the drive torque of the rotary drive motor.

On the other hand, as shown in FIG. 4, a disk 4 is placed on a turntable 7 for recording and reproduction of the disk.
The turntable 7 is driven to rotate by the motor 2 and pressed by the clamper 5 from above. Generally, a laser beam is irradiated from the lower side of the disk by the pickup 3, and information is read by the reflected beam.

As described above, in order to rotate the disk 4 at a high speed and shorten the access time, it is necessary to increase the diameter of the motor 2 and improve the driving torque. In this case, the motor 2 hinders the movement of the pickup 3 and cannot have such a large diameter.

Therefore, a motor 6 is provided on the side of the clamper mechanism for rotatably holding the disk 4, and a mechanism for pressing and holding the disk with the clamp mechanism and the turntable to rotate (see Japanese Patent Application Laid-Open No. 63-004642). Has been proposed, for example, as shown in FIG.

In this mechanism, a disk 4 having a hole formed in the center is rotatably mounted, and a turntable 7 made of a magnetic material is opposed to the upper surface of the disk 4. A clamper 5 for pressing is provided. The clamper 5 is attached to a lower surface of a lid 16 provided to be freely openable and closable with respect to the turntable 7.

The turntable 7 is press-fitted on a rotating shaft 22 rotatably provided on a chassis 20. The turntable 7 has a cone 70 that becomes thinner toward the tip, and a hole in the center of the disc 4 fits into the cone 70.

The clamper 5 includes a projecting piece 55 supported by supporting pieces 15, 15 projecting from the lower surface of the lid 16, and a supporting piece 1.
A shaft 51 penetrating through the opening 11 between 5 and 15;
And a motor magnet 61 provided at the lower end of the disk 4 and facing the upper surface of the disk 4. At the center of the shaft 51 and the motor magnet 61, a hole 56 that fits into the rotary shaft 22 is formed. At the periphery of the opening 11, a drive coil 60 is provided to face the motor magnet 61.

When the disk 4 is placed on the turntable 7 and recording and reproduction are performed, the lid 16 is lowered and the hole 56 of the clamper 5 is fitted to the rotary shaft 22. The turntable 7 and the motor magnet 61 attract and hold the disk 4. When the motor magnet 61 comes into contact with the cone 70, the clamper 5 is slightly lifted, and a gap is formed between the projection 55 and the drive coil 60. In this state, when the drive coil 60 is energized, the clamper 5 rotates while pressing the disk 4 by the electromagnetic force generated between the drive coil 60 and the motor magnet 61. That is, the motor magnet 61 is attracted to the turntable 7 and presses and holds the disk 4.
The face-to-face brushless motor 6 is configured together with the drive coil 60.

The applicant has previously proposed a clamper mechanism shown in FIG. 6 (see Japanese Patent Application Laid-Open No. 3-286466).

The clamper mechanism has a support plate 10 provided so as to be able to approach and separate from the disk 4.
The support plate 10 is fitted in the opening 11. A drive coil 60 is attached to the periphery of the opening 11. The clamper 5 integrally includes a motor magnet 61 facing the upper surface of the drive coil 60, a shaft 51 penetrating through the opening 11, and a pressing piece 52 provided at a lower end of the shaft and in contact with the upper surface of the disk 4. The holding piece 52 is provided with a yoke 62 facing the lower surface of the drive coil 60. A sphere 90 is provided on the upper surface of the shaft 51, and the sphere 90 is in contact with the lower surface of the elastic piece 9 that covers the clamper 5.

Disc 4 placed on turntable 7
On the other hand, when the support plate 10 is lowered, the clamper 5 slightly lifts due to the contact between the pressing piece 52 of the clamper 5 and the disk 4. A gap is created between the drive coil 60 and the motor magnet 61, and the ball 90 contacts the lower surface of the elastic piece 9. The clamper 5 is urged toward the disk 4 by the urging force from the elastic piece 9, and the clamper 5 presses and clamps the disk 4 with the turntable 7. Drive coil 6
0, the yoke 62 and the motor magnet 61
Since the drive coil 60 is located in the magnetic field therebetween, the clamper 5 rotates together with the disk 4.

Further, the applicant has filed Japanese Patent Application No. 8-13817.
No. 0 proposes a clamper mechanism that constitutes the surface-facing brushless motor shown in FIGS. 7 and 8 or the circumferentially-facing brushless motor shown in FIGS. 9 and 10.

FIG. 7 is a partially cutaway view of the clamper 5 and the turntable 7 in a state where the disk 4 is not inserted into the apparatus main body. A rotating shaft 22 is rotatably fitted in a bearing 21 provided on the sub-chassis 20, and a tip end of the rotating shaft 22 is press-fitted into a through hole 71 formed in a central portion of the turntable 7. . A cone 70 that fits into the center hole of the disk 4 protrudes from the upper surface of the turntable 7, and a disk crimping magnet 8 that attracts an iron plate 80 described later is embedded in the upper surface of the cone 70.

The support plate 10 has an opening 11 in which the clamper 5 fits, and a drive coil 60 is attached to the periphery of the opening.

The clamper 5 includes a rotor 50 facing the upper surface of the drive coil 60, a shaft 51 attached to the center of the rotor 50 and passing through the opening 11, and a presser attached to the lower end of the shaft 51. Piece 52. The tip of the shaft body 51 projects below the holding piece 52 and can be fitted into the through hole 71 of the turntable 7. A motor gnet 61 is provided on the lower surface of the rotor 50 so as to face the drive coil 60. When the disk 4 is not inserted into the apparatus main body, the motor magnet 61 and the drive coil 60 are in contact with each other.

First, the drive coil 6 is assembled.
The rotor 50 is placed on the top of the rotor 50, the shaft body 51 and the holding piece 52 are attached from below the rotor 50, and the holding piece 52 is screwed from above the rotor 50 with screws 58, 58.

The lower surface of the holding piece 52 is in contact with the upper surface of the disk 4, and the yoke 6 made of an iron plate is
2 is mounted opposite the lower surface of the drive coil 60.

The drive coil 60 is located in a magnetic field formed between the motor magnet 61 and the yoke 62, and the clamper 5 and the drive coil 60 constitute a brushless motor 6 as described later.

At the center of the holding piece 52, the turntable 7
In the position facing the disk crimping magnet 8 inside,
An iron plate 80 made of a magnetic material that is attracted to the disk pressing magnet 8 is embedded. The disk pressing magnet 8 and the iron plate 80 include the clamper 5 and the driving coil 6.
0 is magnetically independent of the motor 6 and does not affect the characteristics of the motor 6 at all.
The reason why the disk pressing magnet 8 and the iron plate 80 are provided at positions corresponding to the center of the disk is to reduce the size of these components.

FIG. 8 is a view showing a state where the disk 4 is inserted into the apparatus main body. The sub-chassis 20 rotates upward, and the turntable 7 and the clamper 5 are brought together. The clamper 5 is lifted slightly with the lower surface of the holding piece 52 in contact with the upper surface of the disk 4, and a gap is formed between the drive coil 60 and the motor magnet 61. The friction between the drive coil 60 and the motor magnet 61 is released, and the magnet 61 becomes rotatable. Since the vertical gap between the motor magnet 61 and the yoke 62 is constant, the driving torque of the motor 6 is constant even if the gap between the drive coil 60 and the motor magnet 61 changes.

When the disk pressing magnet 8 approaches the iron plate 80, the disk pressing magnet 8 and the iron plate 8
0 attracts. The clamper 5 urges the disc 4 against the turntable 7 by the suction force.

In this state, when the drive coil 60 is energized, the clamper 5 and the turntable 7 attracting the clamper 5 rotate. The disc 4 pressed and held between the clamper 5 and the turntable 7 also rotates. Pickup 3
Slides in the radial direction of the disc to perform recording and reproduction.
If the lower surface of the pressing piece 52 is pressed against the turntable 7 at a position away from the center of the disk 4, the surface runout of the disk 4 can be reduced.

As described above, the magnetic characteristics of the motor 6 are affected by clamping the disk 4 by attracting the disk pressing magnet 8 provided separately from the motor 6 and the iron plate 80 as a magnetic material. Without changing the clamping force. Further, since the disk pressing magnet 8 and the iron plate 80 are provided at positions corresponding to the holes at the center of the disk, the diameter is small. Accordingly, the rotational inertia moment generated by providing the disk pressing magnet 8 and the iron plate 80 is small, and does not affect the recording / reproducing. The disk pressing magnet 8 may be provided on the clamper 5 side, and the iron plate 80 may be provided on the turntable 7 side.

FIG. 9 and FIG. 10 show a disk clamping mechanism when a circumferentially opposed brushless motor is employed.

The structure of the turntable 7 is the same as that in the case where a surface-facing brushless motor is employed. Support plate 10
An opening 11 into which the clamper 5 fits is opened, and a stator substrate 64 is attached so as to cover the periphery of the opening 11. An iron core 63 is provided on the stator substrate 64, and a drive coil 60 is wound around the iron core 63.

The clamper 5 has a cylindrical rotor 50 with an opening directed toward the disk 4, and is attached to the center of the rotor 50, penetrates through the opening 11 of the support plate 10, and has a lower surface in contact with the upper surface of the disk 4. The holding piece 52 is integrally provided. A motor magnet 61 is provided on the inner peripheral surface of the rotor 50 so as to face the drive coil 60.

The pressing piece 52 has a concave portion 53 formed in the center of the lower surface, and the shaft 51 projects downward from the center of the upper surface of the concave portion 53. The shaft 51 is provided with a through hole 71 of the turntable 7.
To prevent the clamper 5 and the turntable 7 from being displaced on a horizontal plane. In the upper surface of the concave portion 53, an iron plate 80 to be attracted to the disk crimping magnet 8 is embedded at a position facing the disk crimping magnet 8 in the turntable 7.

Therefore, when recording and reproducing the disk 4, the turntable 7 rises and the disk pressing magnet 8 approaches the iron plate 80. The disk pressing magnet 8 and the iron plate 80 are attracted to each other.
The clamper 5 urges the disc 4 against the turntable 7.

In the above description, it goes without saying that the motor magnet is replaced with a rotor magnet.

By the way, the motor for rotational driving as described above does not constitute a motor by itself, but only when a disk is inserted, mounted on a turntable and crimped by a clamper. Function as That is, the rotor 50 which is not fixed but floats
When the disk 4 is placed and the turntable 7 is lifted and the disk 4 on the turntable 7 is crimped, a predetermined amount of the stator substrate 64 is coaxial with the turntable 7 and fixed to the support plate 10. It is positioned with a gap.

When the disk 4 is not mounted on the turntable 7 as shown in FIG.
The rotor 50 is located closer to the stator substrate 64 than when the disk 4 is mounted on the turntable 7. That is, the end surface 50a of the cylindrical rotor 50 at the opening side of the rotor 50 is in contact with the upper surface 64a of the stator substrate 64 facing the end surface 50a. In other words, the gap between the motor 50 for rotational drive as described above and the stator substrate 64 becomes zero each time the disk 4 is removed from the turntable 7 and the operation of turning off the power of the apparatus is performed. And
Due to the rotation of the rotor 50, the end face 50a of the rotor 50 faces the upper face 64a of the stator substrate 64 facing the end face 50a.
The printed circuit pattern (not shown) is slid in contact with the printed circuit board.

Therefore, the above-described motor for rotational driving has a drawback that the circuit pattern is peeled off on the stator substrate 64 or the circuit pattern is broken by the rotation of the rotor 50 when the disk 4 is attached or detached. there were.

[0039]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and is intended for a case in which a disk is not mounted on a turntable in a state where the disk is mounted on a disk clamp mechanism as a rotation driving motor. It is another object of the present invention to provide a disk clamp mechanism in which an end surface of a rotor does not contact an upper surface of a stator substrate.

[0040]

According to the present invention, in order to solve the above-described problems, the gap between the end surface 50a of the rotor 50 and the upper surface 64a of the stator substrate 64 when the disk 4 is not mounted on the turntable 7 is described. In order to secure the position, the rotor position setting means for setting the position of the rotor 50 in the height direction is provided between the lower surface 50b of the rotor 50 and the iron core 63.

Further, the rotor position setting means comprises:
Alternatively, three or more plural parts are formed on the concentric circle of the iron core 63. When the rotor position setting means is formed on the rotor 50, they are arranged at equal intervals.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is applied to a disk clamp mechanism of an optical disk reproducing apparatus described in the section of the prior art, and is used as a motor for rotating an optical disk, in particular, a circumferentially opposed motor. When the disk is not mounted on the turntable with the disk mounted on the disk clamp mechanism, a gap with the upper surface of the stator substrate is ensured so that the end surface of the lower portion of the rotor on the opening side does not contact the stator substrate. It is like that.

Hereinafter, an embodiment in which the disk clamp mechanism of the present invention is applied to a circumferentially opposed motor will be described with reference to the drawings. In addition, about the structure same as a prior art, detailed description is abbreviate | omitted using the same code | symbol.

First, FIG. 1 is a diagram showing the positional relationship between the rotor and the stator substrate in the first embodiment of the present invention.
FIG. 1A shows a state when the disk is mounted on the turntable, and FIG. 1B shows a state when the disk is not mounted on the turntable.

In FIG. 1A, reference numeral 64 denotes a stator substrate provided on the support plate 10. A circuit pattern is printed on the stator substrate 64. Reference numeral 63 denotes an iron core provided on the stator substrate 64, and a drive coil 60 is wound around the iron core 63. Also,
The iron core 63 is fixed on the stator substrate 64 by screws 65. The screw 65 is connected to the core 50 from the rotor 50.
Does not protrude to the lower surface 50b side of.

Reference numeral 50 is a rotor formed in a cylindrical shape with the opening facing the disk 4 side. The end surface 50 a of the rotor 50 on the opening side is opposed to the upper surface 64 a of the stator substrate 64. Also, three protrusions 50c are formed on the lower surface 50b of the rotor 50 so as to protrude toward the stator substrate 64. These projections 50c are formed concentrically and at equal intervals of 120 degrees at positions facing the iron core 63. Protrusion 50c
Is 3 if they are arranged concentrically with respect to the shaft body 51 at equal intervals.
More than two places may be formed. This is because it is necessary to maintain a balance during rotation (rotational dynamic balance) such as noise when the rotor 50 rotates, and to secure motor performance.

A drive coil 60 is provided on the inner peripheral surface of the rotor 50.
The rotor magnet 61 is inserted facing the peripheral surface of the rotor.
The rotor magnet 61 does not protrude from the end surface 50 a of the rotor 50 toward the stator substrate 64.

In the relationship between the rotor and the stator substrate configured as described above, when the disk shown in FIG. 1A is mounted on the turntable, the end face 50a of the rotor 50 depends on the thickness of the disk 4. And stator substrate 64
The rotor 50 rotates in a state where a gap A is secured between the upper surface 64a and the lower surface 50b of the rotor 50 and the drive coil 60.

When the disk shown in FIG. 1B is not placed on the turntable, the protrusion 50c of the rotor 50 is connected to the iron core so that the end surface 50a of the rotor 50 does not contact the upper surface 64a of the stator substrate 64. It contacts core 63.
The protrusion 50 c has a height slightly smaller than the thickness of the disk 4, and has a lower surface 50 b of the rotor 50 and the drive coil 60.
Is slightly higher than the gap B '. That is, the height of the projection 50c is set between the thickness of the disk 4 and the gap B ', and the projection 50c sets the position of the rotor 50 in the height direction as rotor position setting means.

Therefore, the protrusion 50c is connected to the lower surface 5 of the rotor 50.
0b, the protrusion 50c is
The end surface 50a of the rotor 50 and the stator substrate 64
A gap A 'is secured between the upper surface 64a and the upper surface 64a. Therefore,
The printed circuit pattern on the upper surface 64a of the stator substrate 64 does not peel off or the circuit pattern is not broken.

Next, FIG. 2 is a diagram showing a positional relationship between a rotor and a stator substrate according to a second embodiment of the present invention.
2A shows a state when the disk is mounted on the turntable, and FIG. 2B shows a state when the disk is not mounted on the turntable.

In FIG. 2A, as in the first embodiment, the rotor position setting means includes the lower surface 50b of the rotor 50 and the iron core 63.
It is provided between.

Reference numeral 63 denotes an iron core provided on the stator substrate 64, and a drive coil 60 is wound around the iron core 63. The iron core 63 is fixed on the stator substrate 64 by screws 65. Screw 65 is
It does not protrude from the iron core 63 toward the lower surface 50 b of the rotor 50.

Reference numeral 50 denotes a rotor formed in a cylindrical shape with the opening facing the disk 4 side. The end surface 50 a of the rotor 50 on the opening side is opposed to the upper surface 64 a of the stator substrate 64. In this case, as the rotor position setting means, a protrusion 63a protruding toward the lower surface 50b of the rotor 50 is attached to the iron core 63 by three.
Are provided at different locations. These convex portions 63a are formed concentrically and at equal intervals of 120 degrees at positions facing the iron core 63. As long as the protrusions 63a are arranged at equal intervals on a concentric circle with respect to the shaft body 51, three or more protrusions 63a may be formed.

A drive coil 60 is provided on the inner peripheral surface of the rotor 50.
The rotor magnet 61 is inserted facing the peripheral surface of the rotor.
The rotor magnet 61 does not protrude from the end surface 50 a of the rotor 50 toward the stator substrate 64.

Then, as shown in FIG.
When the disk is not placed on the turntable, the end surface 50a of the rotor 50
A gap A 'is secured between the upper surface 64a of the stator substrate 64 and the upper surface 64a of the stator substrate 64. The height of the protrusion 63a is set between the thickness of the disk 4 and the gap B 'between the lower surface 50b of the rotor 50 and the drive coil 60, and the protrusion 63a serves as a rotor position setting means.
Is set in the height direction.

FIG. 3 is a diagram showing a positional relationship between a rotor and a stator substrate according to a third embodiment of the present invention.
3A shows a state when the disk is mounted on the turntable, and FIG. 3B shows a state when the disk is not mounted on the turntable.

In FIG. 3A, as in the first embodiment, the rotor position setting means comprises the lower surface 50b of the rotor 50 and the iron core 63.
It is provided between.

Reference numeral 63 denotes an iron core provided on the stator substrate 64, and a driving coil 60 is wound around the iron core 63. The iron core 63 is fixed on the stator substrate 64 by screws 65. In this case, a screw 65 for screwing the iron core 63 to the stator substrate 64 is used.
Is a lower surface 50b of the rotor 50 as rotor position setting means.
It is also used to protrude to the side and is provided at three locations. These screws 65 are formed concentrically and at equal intervals of 120 degrees at a position facing the iron core 63. As long as the screws 65 are arranged at equal intervals on a concentric circle with respect to the shaft body 51, three or more screws 65 may be formed.

Numeral 50 is a rotor formed in a cylindrical shape with the opening facing the disk 4 side. The end surface 50 a of the rotor 50 on the opening side is opposed to the upper surface 64 a of the stator substrate 64.

Then, as shown in FIG. 3B, the end face 50a of the rotor 50 when the disk is not mounted on the turntable is fixed to the stator substrate 64 by the screw 65.
A gap A 'is ensured between the upper surface 64a of the stator substrate 64 and the upper surface 64a of the stator substrate 64. In addition, screw 6
The height is determined by the thickness of the disk 4 and the lower surface 5 of the rotor 50.
0b and the gap B 'between the drive coil 60, and the screw 65 sets the position of the rotor 50 in the height direction as a rotor position setting means.

The description of the above embodiments is for the purpose of illustrating the present invention and should not be construed as limiting the invention described in the appended claims or reducing the scope thereof. In addition, the configuration of each part of the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made within the technical scope described in the claims.

[0063]

As described above, according to the present invention, since the rotor position setting means for setting the position of the rotor 50 in the height direction is provided between the lower surface 50b of the rotor 50 and the iron core 63, the end face 50a of the rotor 50 is provided. A gap between the disk 50 and the upper surface 64a of the stator substrate 64 can be ensured. Even if the disk 4 is not mounted on the turntable 7 and the disk 4 is attached / detached and the disk clamp is repeated, the end surface 50a of the rotor 50 can be secured. Can be provided without contact with the upper surface 64a of the stator substrate 64.
Thus, it is possible to provide a disk clamp mechanism without peeling and disconnection of the circuit pattern printed on the upper surface 64a of the stator substrate 64.

Further, the rotor position setting means comprises:
Alternatively, since three or more places are formed on the concentric circle of the iron core 63, the end face 50 a of the rotor 50 extends over almost the entire circumference.
And a gap between the upper surface 64a of the stator substrate 64 and the upper surface 64a. Further, the rotor position setting means is connected to the rotor 50.
In this case, the rotor position setting means are arranged at regular intervals, so that the rotational dynamic balance of the rotor 50 is taken into consideration as a rotational driving motor. There is a specific effect that rotation can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a positional relationship between a rotor and a stator substrate according to a first embodiment of the present invention. FIG. 1A shows a state in which a disk is mounted on a turntable, and FIG. Each state when not placed on the top is shown.

FIG. 2 is a view showing a positional relationship between a rotor and a stator substrate according to a second embodiment of the present invention. FIG. 2A shows a state in which a disk is mounted on a turntable, and FIG. Each state when not placed on the top is shown.

3A and 3B are diagrams showing a positional relationship between a rotor and a stator substrate according to a third embodiment of the present invention, wherein FIG. 3A shows a state in which a disk is mounted on a turntable, and FIG. Each state when not placed on the top is shown.

FIG. 4 is a side view of a disk recording / reproducing apparatus in which a normal motor is arranged on a pickup side.

FIG. 5 is a sectional view of a conventional clamper and a turntable.

FIG. 6 is a sectional view of a clamper and a turntable in another conventional example.

FIG. 7 is a diagram showing a positional relationship between a clamper and a turntable in a disk insertion standby state in another conventional surface-facing motor.

FIG. 8 is a diagram showing a positional relationship between a clamper and a turntable at the time of recording / reproducing a disc in another conventional surface-facing motor.

FIG. 9 is a diagram showing the positional relationship between a clamper and a turntable in a disk insertion standby state in another conventional circumferentially opposed motor.

FIG. 10 is a diagram showing a positional relationship between a clamper and a turntable at the time of disk recording / reproduction in another conventional circumferentially opposed motor.

FIG. 11 is a diagram showing a positional relationship between a rotor and a stator substrate in a circumferentially opposed motor of another conventional example, showing a state in which a disk is not placed on a turntable.

[Explanation of symbols]

 4 Disc 6 Motor 7 Turntable 50 Rotor 50a End face (of rotor 50) End face 50b (of rotor 50) Lower surface 50c (of rotor 50) Projection 51 Shaft body 60 Drive coil 61 Rotor magnet 63 Iron core 63a (of iron core) 64 Stator substrate 64a Upper surface (of stator substrate 64) 65 Screw

Claims (7)

[Claims] 1. A turntable 7 on which a recording / reproducing disk 4 is rotatably mounted, and the turntable 7
The disk 4
And a clamper 5 for pressing and holding the clamper between the turntable 7 and the clamper 5. The clamper 5 is a disk clamp mechanism having a motor 6 for rotating the disk 4, wherein the iron core 63 is mounted on a support member on which the clamper 5 is mounted. A stator substrate 64 having a drive coil 60 wound and formed on the iron core 63; a rotor 50 provided in a tubular shape with an opening facing the disk 4; A motor is formed by inserting a rotor magnet 61 into the inner peripheral surface to be formed. When the disk 4 is not mounted on the turntable 7, the end surface 50 a of the rotor 50 is placed on the upper surface 64 a of the stator substrate 64. An optical disc reproducing apparatus provided with a rotor position setting means for setting a position of the rotor 50 in a height direction so as not to come into contact with the disc; Disk clamp mechanism. 2. The rotor position setting device according to claim 1, wherein the rotor position setting means is a projection formed on a lower surface of the rotor and protruding toward the stator substrate. A disc clamping mechanism for an optical disc reproducing device, wherein 3. The disk clamp mechanism of an optical disk reproducing apparatus according to claim 2, wherein at least three or more projections 50c are formed on a concentric circle and are arranged at equal intervals. 4. The rotor position setting means according to claim 1, wherein the rotor position setting means is a protrusion 63a formed on the iron core 63 and protruding toward the lower surface 50b of the rotor 50.
A disc clamp mechanism for an optical disc reproducing apparatus, wherein 3a is in contact with the lower surface 50b of the rotor 50. 5. A disc clamping mechanism for an optical disc reproducing apparatus, wherein a plurality of the protrusions 63a according to claim 4 are provided on at least three places on a concentric circle and are arranged at equal intervals. 6. The rotor position setting means according to claim 1, wherein the core core 63 is screwed to a stator substrate 64, and the screw 6 protrudes toward the lower surface 50b of the rotor 50.
5, the screw 65 is provided on the lower surface 50b of the rotor 50.
A disc clamping mechanism for an optical disc reproducing device, wherein 7. A disk clamp mechanism for an optical disk reproducing apparatus, wherein a plurality of the screws 65 according to claim 6 are provided at a plurality of concentric circles at three or more places and are arranged at equal intervals.