JP2002142407A - Motor, disk turning gear, and disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the side-runout accuracy of a turntable and simplify the structure thereof. SOLUTION: A motor comprises a stator assembly 6 having a stator coil 7a, a rotor case 11 that is made of a metal plate and formed in the shape of a cylinder with the short axial length thereof, rotor magnets 20 that are fixed on the inner circumferential surface of the rotor case and are opposed to the stator coil, the turntable 14 that is made of synthetic resin and integrally coupled with one end of the rotor case and has a disk placement face 17 on which a disk body 2 is to be placed, and a rotating shaft 21 that is fixed on the turntable and is rotatably supported on the stator assembly. The rotor case and the turntable are coupled together by integral molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel motor, a disk rotating device and a disk drive. More specifically, the present invention relates to a technique for improving surface runout accuracy.

[0002]

2. Description of the Related Art Disc bodies, for example, CD-Rs (Compac
2. Description of the Related Art A disk rotating device in a disk drive device that records and / or reproduces a signal on a disk-shaped recording medium such as a disk recordable has a structure in which a turntable on which a disk body is mounted is rotated by a motor.

The above-mentioned conventional disk rotating device has a structure as shown in FIGS. 13 and 14, for example.

The disk rotating device a comprises a motor section b and a turntable c, and the motor section b comprises a stator section d and a rotor section e.

The stator portion d has a bearing boss g fixed to the center of the stator substrate f, a thrust bearing h provided at a lower end of the bearing boss g, and a thrust bearing h located around the bearing boss g. And the stator coil f 'is fixed.

[0006] The rotor part b is made of a magnetic metal and has a rotor case i formed in a deep dish shape, a rotor magnet j fixed to the inner peripheral surface of the rotor case i, and a metal part fixed to the center of the rotor case i. And a rotary shaft 1 press-fitted into the bush k. The rotor case i
A spacer n is provided between the disk portion m and the rotor magnet j.
, Which defines the position of the rotor magnet j. Then, the rotating shaft 1 is rotatably inserted into a bearing boss g of the stator portion d, the end of the rotating shaft 1 abuts on the thrust bearing h, and the rotor magnet j is connected to a stator coil f ′ (not shown). Faced. Then, the magnetic center of the rotor magnet j and the magnetic center of the stator coil f 'are shifted in the axial direction of the rotating shaft l, whereby the rotor portion e is urged in the direction of the stator portion d. It is kept in contact with the bearing h.

The turntable c is made of a synthetic resin,
It is almost disk-shaped. A positioning projection o is formed at the center of the upper surface of the turntable c.
Is formed as an inclined surface p. A shallow concave portion q is formed on the upper surface of the positioning protrusion o, and a suction plate r made of a magnetic metal plate is fixed in the concave portion q.
Further, a buffer sheet s made of rubber is fixed to a peripheral portion of the upper surface of the turntable c.

Then, a portion of the rotary shaft 1 projecting upward from the bush k is press-fitted into the center of the turntable c.

Therefore, when a current is applied to the stator coil f 'of the stator section d, the rotor section e is rotated, and the turntable c fixed to the same rotation shaft l as the rotor section e is rotated. The disc body (not shown) mounted on the table c is rotated.

[0010]

However, the above-mentioned conventional disk rotating device a has a problem in surface runout accuracy.

That is, since the turntable c is press-fitted into the rotary shaft l, the coaxiality between the two, that is, the degree of coincidence between the axis of the rotary shaft l and the axis of the turntable c is maintained. There is a problem that it is difficult to drip. And the rotation axis l
If the axis of the turntable c does not coincide with the axis of the turntable c, the perpendicularity between the axis lC of the rotary shaft 1 and the disk mounting surface cP of the turntable c is incorrect (see the broken line in FIG. 15), As a result, the disk mounting surface cP undulates up and down, that is, the disk oscillates.

FIG. 13 shows a turntable c having a diameter of 30 mm.
And ten disk rotating devices a having the structure shown in FIG. 14 are prepared as samples (sample numbers are 1, 2,
3, 4, 5, 6, 7, 8, 9, 10), and eight measurement points at 45 ° intervals in the circumferential direction on a circumference 1 mm inward from the outer circumference of the disc mounting surface cP. (Set each measurement point to p1, p2, p3, p4, p5, p6,
p7 and p8. FIG. 16), three revolutions per minute (3 rp)
m) The reference position at each measurement point when rotated below (the position of the lowest point among all the measurement points of all the above-mentioned samples) is defined as 0 (zero), and Table 1 and FIG. 17 show the results of measuring the distance in mm (millimeter) units.

[0013]

[Table 1]

The number "pp" at the right end in Table 1 indicates the difference between the minimum value and the maximum value, and the larger the value, the greater the surface run-out, as can be seen from Table 1 and FIG. As described above, the average value of the surface runout is 0.0486 mm, which is considerably large.

Further, since the rotary shaft 1 is press-fitted into the turntable c, the amount of press-fit of the rotary shaft l into the turntable c is not constant, and therefore, the height H of the entire apparatus (FIG. 1)
3) is not constant.

Further, the rotor case i and the turntable c are fixed to the rotating shaft l in the axial direction in a stacked state, and the rotor case i is fixed via the bush k. There is also a problem that the size becomes large and it is difficult to reduce the thickness of the device.

Furthermore, there is also a problem that the number of components constituting the whole is large and causes an increase in cost.

Further, as described above, the attractive force acting between the stator coil and the rotor magnet j causes
The rotation shaft 1 is prevented from coming off the bearing boss g,
In a normal use state, the rotor portion e does not fall out of the stator portion d. However, if a strong impact acts, the rotor portion e may fall out of the stator portion d. There is also a problem that it is necessary to separately provide a retaining means for e.

Accordingly, an object of the present invention is to improve the accuracy of the runout of the turntable and to simplify the structure.

[0020]

According to the present invention, there is provided a motor in which a rotor case and a turntable are connected by integral molding to solve the above-mentioned problems.

Therefore, in the motor of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the accuracy of the runout can be improved.

Further, since the turntable forms a part of the motor, the number of parts can be reduced and the size in the axial direction can be reduced.

In order to solve the above-mentioned problems, the disk rotating device according to the present invention is such that a rotor case and a turntable are connected by integral molding.

Therefore, in the disk rotating device of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the surface runout accuracy can be improved.

Further, since the turntable forms a part of the motor, the number of parts can be reduced and the size in the axial direction can be reduced.

In order to solve the above-mentioned problems, the disk drive of the present invention is one in which a rotor case and a turntable are connected by integral molding.

Therefore, in the disk drive device of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the surface runout accuracy can be improved.

Further, since the turntable forms a part of the motor, the number of components can be reduced and the size in the axial direction can be reduced.

[0029]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 schematically shows an embodiment of the disk drive 1. The disk drive 1 performs recording and / or reproduction of signals on the disk-shaped recording medium 2, and includes a disk rotating device 3 and an optical head device 4.

The disc-shaped recording medium 2 includes C
Various types such as an optically readable disk such as D (Compact Disk), a magneto-optical disk, and a phase-change disk can be used, and the present invention does not matter the recording method or size.

The disk drive device 1 includes a device capable of both reproduction and recording in addition to a device dedicated to reproduction or recording, and does not ask whether it is stationary or portable in its usage form. .

In the disk drive device 1, the disk-shaped recording medium 2 is rotated by the disk rotating device 3, and is moved by the optical head device 4 moving in the radial direction of the rotating disk-shaped recording medium 2. Recording and / or reproduction of a signal with respect to the recording medium 2 are performed.

The above-mentioned disk rotating device 3 comprises a turntable on which the disk body (disk-shaped recording medium) 2 is mounted and a motor for rotating the turntable.

2 to 5 show an embodiment of the motor of the present invention.

The motor 5 has a stator part and a rotor part.

The stator portion 6 has a bearing boss 8 fixed to a center portion of a stator substrate 7, a thrust bearing 9 is provided at a lower end portion of the bearing boss 8, and a bearing boss 8 is provided around the bearing boss 8. The stator coil 7a is fixed so as to be located.

The rotor section 10 has a substantially cylindrical rotor case 11 having a short axial length. Rotor case 1
Reference numeral 1 denotes a metal plate having magnetism, and a flange-shaped reference projection 12 protruding outward at an upper end is formed in a ring shape over the entire circumference. Also, at the portion near the upper end of the rotor case 11, a small circular coupling hole 1 is provided at an appropriate interval in the circumferential direction, for example, at three places at 120 ° intervals.
3, 13, 13 are formed.

A turntable 14 is fixed to the upper end of the rotor case 11. The turntable 14 is formed as a synthetic resin molded product, and is formed in a substantially disk shape. The outer periphery of the turntable 14 is located above the reference protrusion 12 of the rotor case 11, and the reference protrusion 12 protrudes outward from the outer peripheral surface of the turntable 14. The turntable 14 has a spacer portion 15 located inside the upper end portion of the rotor case 11, and coupling holes 13, 13, 13 of the rotor case 11 have coupling protrusions projecting from the spacer portion 15. 16, 16, 16 are fitted.

A large circular recess 18 is formed in the upper surface 17 of the turntable 14, that is, in the center of the disk mounting surface 17, and a center boss 19 projects upward from the center of the recess 18. , The center boss 1
The base end portion 19a of 9 has a slightly larger diameter.

Further, a rotor magnet 20 is fixed to a portion of the inner peripheral surface of the rotor case 11 below the lower end of the spacer portion 15 of the turntable 14. The mounting position of the rotor magnet 20 is
Defined by

The upper end of the rotating shaft 21 is fixed to the center of the center boss 19 of the turntable 14.

The connection of the rotor case 11, the turntable 14, and the rotating shaft 21 in the rotor section 10 is performed by so-called integral molding. The method of integral molding will be described with reference to FIGS.

The mold 22 for integral molding includes a fixed mold 23 and a movable mold 24.

FIG. 4 shows a state in which the fixed mold 23 and the movable mold 24 are clamped, and the synthetic resin for the turntable 14 is injected between the two molds 23 and 24. A cavity 25 is formed. Gates 26, 26 are formed in the fixed mold 23, and the synthetic resin melted into the cavity 25 is injected through the gates 26, 26.

The movable mold 24 has a cavity lower half 2
A support groove 27 dug down along the periphery of 5a and a support hole 28 dug down in the center of the lower cavity half 25a
The rotor case 1 is formed in the support groove 27.
The lower half of the rotary shaft 21 is fitted and supported in the support hole 28. A notch 29 is formed along the entire periphery of the lower half 25a of the cavity of the movable mold 24 along the periphery of the opening.
One reference projection 12 is located in the notch 29.

When the mold is clamped in the above state, the cavity 25 is formed by the upper cavity 25b of the fixed mold 23 and the lower cavity 25a of the movable mold 24, and the rotor case 11 is closed. The upper surface of the reference projection 12 is pressed by the parting surface 30 of the fixed mold 23, and the upper end of the rotating shaft 21 is a shallow support recess formed at the center of the upper cavity 25 b of the fixed mold 23. 31 (see FIG. 4).

As shown in FIG. 4, the molten synthetic resin 32 (portion shown in FIG. 5) is injected into the cavity 25 through the gates 26, 26 while the mold is clamped. Although the injection pressure of the synthetic resin material 32 is considerably high, the rotor case 11 has a substantially lower half located in the support groove 27 of the movable mold 24 and the reference projection 1.
2 is sandwiched between the fixed mold 23 and the movable mold 24, and the lower half of the rotating shaft 21 has a movable mold 2.
4 and the upper end thereof is pressed by the support recess 31 of the fixed mold 23, so that the injection pressure of the synthetic resin material 32 causes the positions of the rotor case 11 and the rotary shaft 21 to shift. Never. Then, as the molten synthetic resin 32 injected into the cavity 25 is cooled and solidified, the rotor case 11, the turntable 14, and the rotating shaft 21 are integrated as described above.

Then, the rotating shaft 21 of the rotor section 10 is rotatably supported by the bearing boss 8 of the stator section 6, and the stator coil 7 a of the stator section 6 faces the rotor magnet 20, thereby constituting the motor 5. Note that the magnetic center of the stator coil 7a, specifically, the core (not shown) of the stator coil 7a and the magnetic center of the rotor magnet 20 are shifted vertically, that is, in the axial direction of the rotating shaft 21, and as a result, the core of the stator coil 7a is shifted. The rotor part 10 is urged downward by the attraction force acting between the rotor magnet 20 and the
The state in which the lower end of the rotating shaft 21 is in contact with the thrust bearing 9 disposed in the bearing boss 8, that is, in a pre-pressed state, prevents rattling during rotation of the rotor section 10 and prevents the rotor section 10 from rotating. Of the rotating shaft 21 from the bearing boss 8 is prevented.

In the motor 5, the rotor case 1
1 and the turntable 14 are integrated by integral molding, so that the rotor case 11 and the turntable 14 are integrated.
Is easy to maintain, and surface runout accuracy can be improved.

The turntable 14 is connected to the rotor 10
Therefore, the number of parts can be reduced, which contributes to cost reduction and can reduce the size in the axial direction.

Further, since the rotor case 11, the turntable 14, and the rotary shaft 21 are integrated by integral molding, the coaxiality between these three members is determined by the precision of the integral molding die 22, so that Mold 22 for integral molding
By increasing the accuracy of the above, it is possible to increase the coaxiality between the three members, and to increase the surface runout accuracy.

Further, since the reference projection 12 which is bent outward is formed at one end of the rotor case 11 having a substantially cylindrical shape, the rigidity of the rotor case 11 is increased. , And eventually the rotor portion 10 is hardly deformed, the dimensional accuracy is improved, and the surface runout accuracy is improved.

Further, the reference projection 12 is clamped by the two dies 23 and 24 at the time of clamping during molding, so that the position of the rotor case 11 in the dies 22 can be stabilized. Contribute. The reference projection for this purpose does not need to be formed in a ring shape over the entire circumference of the rotor case 11.

FIGS. 6 and 7 show a first embodiment of the disk rotating device using the motor 5 described above. FIG. 6 shows a state before the disc body (disk-shaped recording medium) 2 is mounted on the turntable 14 in the left half from the axis of the rotating shaft 21, and a turntable in the right half. 14 shows a state where the disk body 2 is mounted on the disk 14.

The disk rotating device 33 includes a center ring 34 and a center yoke 3 at the center of the turntable 14.
5 are arranged.

The center ring 34 is formed of a synthetic resin and has a substantially cylindrical shape with a short axial length. The upper end 34a of the outer peripheral surface of the center ring 34 is an inclined surface that is displaced toward the center as it goes upward. Further, a flange portion 34 protruding inward from a position slightly below the upper end.
b is formed. Then, the center ring 34
Are vertically slidably disposed in the concave portion 18 of the turntable 14 (see FIG. 6).

The center yoke 35 is made of a magnetic metal, and is integrally formed with a cylindrical portion 35a and a flange portion 35b projecting outward from the upper end of the cylindrical portion 35a.
Then, the cylindrical portion 35a is externally press-fitted into the center boss 19 of the turntable 14 (see FIG. 6).

A compression coil spring 36 is inserted between the center ring 34 and the recess 18 of the turntable 14. As a result, the center ring 34 is urged upward, and when the flange portion 34b contacts the flange portion 35b of the center yoke 35, further upward movement is prevented (see FIG. 6).

An annular rubber sheet 37 is fixed to the outer periphery of the upper surface of the turntable 14 as a cushioning material (see FIGS. 6 and 7).

When the disk 2 is placed on the turntable 14, that is, when the periphery of the center hole 2a of the disk 2 is placed on the inclined surface 34a of the center ring 34, the right half of FIG. The state shown in FIG. Then, a chucking member (not shown) located above the turntable 14 moves so as to approach the turntable 14 and contacts the upper surface of a portion near the center hole 2a of the disk 2. Then, the chucking member further approaches the turntable 14 by the attraction force acting between the magnet provided on the chucking member and the center yoke 35, and presses the disk 2 toward the turntable 14. As a result, the compression coil spring 36 is further compressed, whereby the center ring 34 moves so as to be retracted into the concave portion 18 of the turntable 14, so that the lower surface of the disk 2 is pressed against the rubber sheet 37 and the disk 2 is pressed. Is sandwiched between the turntable 14 and a chucking member (not shown), and the center hole 2a is
Center ring by contacting the inclined surface 34a of
That is, the center of the disk body 2 matches the center of the turntable 14 (see the right half of FIG. 6).

The above-described disk rotating device 33 is fixed to the chassis 38, for example, so that most of the disk rotating device 33 is located below the chassis 38, and most of the turntable 14 is moved upward from the opening 38a provided in the chassis 38. It is made to protrude. The reference projection 12 provided on the rotor case 11 is located immediately below the chassis 38, and the opening diameter of the opening 38 a of the chassis 38 is slightly smaller than the outer diameter of the reference projection 12. The rotor portion 10 does not fall off from the stator portion 6 in a normal use mode, but when a large impact is applied due to a drop or the like, the rotating shaft 21 of the rotor portion 10 comes out of the bearing boss 8 of the stator portion 6. There is a fear. However, by adopting the above-described mounting structure, when the rotor unit 10 attempts to move in a direction away from the stator unit 6, the reference projection 12 comes into contact with the lower opening edge of the opening 38 a of the chassis 38, and any further Since the movement in the direction away from the stator portion 6 is prevented, the rotor portion 10 is prevented from falling off from the stator portion 6. Note that the stator portion 6 of the rotor portion 10
In order to prevent the reference projection 12 from falling off, it is not necessary that the reference projection 12 be formed in a ring shape over the entire circumference.

In the disk rotating device 33 described above, the turntable 14 on which the disk 2 is mounted is integrated with the rotor case 11 and the rotating shaft 21 by integral molding as one of the components of the rotor unit 10 of the motor 5. Because of this, the number of parts is reduced, which contributes to cost reduction and the size in the axial direction can be reduced.
Surface runout accuracy is improved.

Eight disk rotating devices 33 having a diameter of the turntable c of 30 mm and having the structure shown in FIGS. 6 and 7 were prepared as samples (sample numbers 1, 2, 3, and 4 respectively).
4, 5, 6, 7, and 8), and 12 measurement points are set at 30-degree intervals in the circumferential direction on the circumference 1 mm inward from the outer circumference of the disk mounting surface dS (each measurement point). To p1, p2, p3, p4, p5, p6, p7, p8,
These are p9, p10, p11, and p12. 9), and the distance in the vertical direction from the reference plane (the height at the measurement point p1) at each measurement point to the reference (0 point) when rotating at 3 revolutions per minute (3 rpm) or less.
Table 2 and FIG. 10 show the results measured in units of m (millimeters).

[0065]

[Table 2]

The number "pp" at the right end in Table 2 indicates the difference between the minimum value and the maximum value, and the larger the numerical value, the greater the surface deflection. Indicates that it has fallen below the reference. As can be seen from Table 2 and FIG. 10, the average value of the surface runout is 0.016 mm, which is considerably smaller than the surface runout in the conventional disk rotating device a described above.

FIGS. 11 and 12 show a second embodiment of the disk rotating apparatus according to the present invention. Note that FIG.
In order to make the operation of chucking the disk 2 easy to understand, the left half with respect to the axis of the rotating shaft 21 shows the state before the disk 2 is mounted, and the right half Indicates a state where the disk body 2 is chucked.

The disk rotating device 39 according to the second embodiment includes the turntable 14 of the motor 5 described above.
A chucking mechanism for holding the disk body 2 on the disk mounting surface is provided thereon.

The chucking mechanism has three disk holding members 40, 40, 40. Disc holding member 4
The reference numerals 0, 40, and 40 are arranged at equal intervals in the circumferential direction in the concave portion 18 of the turntable 14. Disc holding member 4
0, 40, and 40 are support portions 41 provided at the bottom of the concave portion 18 so that the lower end thereof can rotate between the position shown in the left half portion and the position shown in the right half portion of FIG. It is rotatably supported by 41, 41 (refer FIG. 11, FIG. 12).

The disk holding member 40 is formed of synthetic resin and is long in the vertical direction, and has a pressing claw 42 formed at the upper end thereof so as to protrude in the outer peripheral direction of the turntable 14. A regulated protrusion 43 is provided at an intermediate portion in the vertical direction of a surface opposite to the direction in which the holding claw 42 protrudes, and the lower surface 43a of the regulated protrusion 43 moves upward toward the tip. The rear surface 43b is a stopper surface extending substantially in the vertical direction. Further, a restricting piece 44 projecting obliquely downward is formed on the opposite side of the upper end of the disc pressing member 40 from which the pressing claw 42 is provided (see FIG. 11).

A centering member 45 is vertically movably disposed in the concave portion 18 at the center of the turntable 14 (see FIGS. 11 and 12). Centering member 4
Reference numeral 5 is formed of a synthetic resin and has a substantially cylindrical shape with a short axial length. Upper end 4 of outer peripheral surface of centering member 45
5a is an inclined surface which is displaced toward the center as it goes upward. In addition, a flange portion 45b protruding inward from a position slightly below the upper end is formed (see FIG. 11). Three notches 46, 46, 46 are formed in the flange 45 b at equal intervals in the circumferential direction.
The inner edges of 6, 46, 46 are cam edges 47, 47, 47. The cam edge 47 has two stabilizers 47a and 47b which are circumferentially separated from each other and extend in the circumferential direction, and an inclined portion 47c is provided between the two stabilizers 47a and 47b.
Is continued by Then, the above two stable parts 4
7a and 47b are counterclockwise directions of the inclined portion 47c (FIG. 1).
The chucking stabilizing portion 47a located on the side of the arrow CCW in FIG.
On the other hand, the non-chucking stabilizing portion is located on the side of the reference).

Centering member 45 and turntable 1
A compression coil spring 48 is interposed between the bottom of the concave portion 18 and the compression coil spring 48. Thus, the centering member 45 is urged upward, that is, in a direction away from the turntable 14. When the centering member 45 is at the upper end of the moving range, that is, at the position shown in the left half of FIG. 11, the non-chucking stabilizing portions 47b, 47b, 47b of the cam edges 47, 47, 47 are disc holding members. 4
The disc holding members 40, 40, and 40 are located at positions corresponding to 0, 40, and 40, and are in a state of being inclined toward the rotation shaft 21 (see the left half of FIG. 11). The centering member 45 moves downward against the urging force of the compression coil spring 48, that is,
When moving in the direction approaching the turntable 14 (FIG. 11)
, The centering member 45 is simultaneously rotated in the clockwise direction (arrow CW direction) in FIG.
The chucking stabilizing portions 47a of the cam edges 47, 47, 47,
47a, 47a come to a position corresponding to the disk holding members 40, 40, 40, whereby the disk holding members 40, 40, 40 move away from the rotating shaft 21 as shown in the right half of FIG. Will be able to fall.

As described above, the centering member 45
Moves in the vertical direction while rotating around the rotation axis 21, that is, makes a helical movement. As a configuration for this, a projection or a spiral groove is formed on the outer peripheral surface of the centering member 45. Recess 1 of turntable 14
A helical groove or projection that engages with these may be formed on the inner peripheral surface of 8. The movement range of the centering member 45 is defined by the engagement range between the spiral groove and the projection.

The regulating member 49 is provided movably in the vertical direction with the regulating member 49 fitted on the center boss 19 of the turntable 14. The regulating member 49 is formed by integrally forming a substantially thick cylindrical main portion 49a and a flange portion 49b projecting laterally from an upper end of the main portion 49a. Three notches 49c, 49c, 49c are formed at equal intervals in the direction. The main part 4
A groove 49d opened at the lower end is formed in 9a up to near the upper end. Notch 49 in the outer peripheral surface at the lower end of main portion 49a
c, 49c, and 49b at the positions corresponding to 49c.
e, 49e, and 49e are notches 49c, 49c, and 49c of a substantially intermediate portion in the vertical direction of the outer peripheral surface.
Are located at positions corresponding to.
However, each is protruded. Then, the compression coil spring 50 is inserted between the upper end of the groove 49d and the upper surface of the base end portion 19a of the center boss 19 of the turntable 14, whereby the regulating member 49 moves upward, that is, separates from the turntable 14. (See FIG. 11).
reference). Then, the disk holding members 40, 40, 4
Numeral 0 indicates a state in which it can be tilted in the cutouts 49c, 49c, 49c of the regulating member 49.

With the regulating member 49 positioned at the lower end of the movement range, the regulated projections 43, 43, 43 of the disk holding members 40, 40, 40 are adjusted to the regulating projections 49e, 49.
e, 49e, and the regulating protrusions 49e, 49
11e and 49e abut against the inclined surfaces 43a, 43a, 43a of the regulated projections 43, 43, 43, whereby the regulating member 49 cannot move further upward (FIG. 11, left). See half).

When the chucking mechanism is in the state shown in the left half of FIG. 11, the disk 2 is inserted into the center hole 2a.
Is placed on the inclined surface 45a of the centering member 45. Then, the centering member 45 becomes the disk 2
Due to the weight of the disk unit 2 or by being pushed downward through the disk body 2, that is, by being pushed toward the turntable 14, it moves downward while rotating clockwise in FIG. 12 (see arrow CW). The rotation of the centering member 45 in the clockwise direction in FIG.
7, 47, 47 are contacted with the disc holding members 40, 40, 40.
Moving from 47b to chucking stabilizing portions 47a, 47a, 47a via inclined portions 47c, 47c, 47c,
As shown in the right half of FIG. 11, the disk holding members 40, 40, 40 are in a state in which the upper end can fall in a direction away from the rotation shaft 21. Then, the regulating member 49 is moved upward by the urging force of the compression coil spring 50, and at this time, the regulating protrusions 49e, 49e, 49e are inclined surfaces of the regulated projections 43, 43, 43 of the disk holding members 40, 40, 40. 43a, 43a, 43a, the disc holding members 40, 40, 40 fall down in the direction away from the rotating shaft 21 so that their holding claws 42, 42, 42 are opened above the center hole 2a of the disc body 2. The edge portion is pressed down from above, so that the disc body 2 has the opening edge portion of the center hole 2a in the inclined surface 4 of the centering member 45.
5a and the pressing claw 4 of the disk holding members 40, 40, 40
2, 42, and 42 sandwiched from above and below (see the right half of FIG. 11). At this time, the opening edge of the center hole 2a of the disk body 2 is pressed by the resilient force of the compression coil spring 48 via the inclined surface 45a of the centering member 45, and the pressing claws 42, 42 of the disk holding members 40, 40, 40.
42 is pressed down from below. And
The upward movement of the regulating member 49, that is, the movement in the direction away from the turntable, is caused by the restricted protrusion 49
f, 49f, 49f are disk holding members 40, 40, 4
0, and stops when it comes into contact with the control pieces 44, 44, 44 of the control member 49. In this state, the control projections 49e, 49
e, 49e are the disk holding members 40, 40, 4
0 abuts against the stopper surfaces 43b, 43b, 43b (see the right half of FIG. 11).
As shown in the right half of FIG.
As shown in the left half of FIG.
Is prevented from falling down in the direction approaching. In this state, the resilient force of the compression coil spring 50 is applied to the regulating pieces 44 of the disc holding members 40, 40, 40 via the regulating member 49.
Acts to press the upper portions 44, 44 upward, whereby the disk holding members 40, 40, 40 are urged in a direction of falling away from the rotating shaft 21, and therefore, the elastic force of the compression coil spring 50 is Disk holding members 40, 4
The pressing claws 42, 42, 42 of 0, 40 act so as to press the opening edge of the center hole 2 a of the disk body 2 from above.

As described above, the disk 2 is chucked, that is, held in a state of being placed on the turntable 14.

When the disk 2 chucked on the turntable 14 is to be removed from the turntable 14, the regulating member 49 is moved downward against the urging force of the compression coil spring 50 from the state shown in the right half of FIG. To, ie
It is moved in a direction approaching the turntable 14. Then, the regulating protrusions 49e, 49e, 49e of the regulating member 49 are moved to the stopper surfaces 43 of the disc holding members 40, 40, 40.
Since the disk holding members 40, 40, and 40 are displaced downward from the b, 43b, and 43b, the disk holding members 40, 40, and 40 can fall in a direction approaching the rotating shaft 21. As a result, there is no object against the urging force of the compression coil spring 48, so that the centering member 45 moves upward by the urging force of the compression coil spring 48 in the counterclockwise direction in FIG.
(See CW). When the spring force of the compression coil spring 48 is small, the centering member 45 does not move upward unless the disk body 2 is removed, but the spring force of the compression coil spring 48 can be reduced by the centering member 45 only by the weight of the disk body 2. If the regulating member 49 is not moved downward, the centering member 45 is automatically moved upward by pushing the regulating member 49 downward, so that the operability is improved.

Since the centering member 45 rotates counterclockwise in FIG. 12 while moving upward,
Cam edges 47, 47 formed on the centering member 45;
The portion of 47 corresponding to the disc holding members 40, 40, 40 changes from the chucking stabilizing portions 47a, 47a, 47a to the non-chucking stabilizing portions 47b, 47b, 47b via the inclined portions 47c, 47c, 47c. Therefore, the disk holding members 40, 40, 40
The disc 2 is pushed down by the discs 7 and 47 so as to approach the rotary shaft 21, and the pressing of the disc body 2 by the press claws 42, 42, 42 is released (see the right half of FIG. 11). Therefore, the disk 2 can be removed from the turntable 14.

In the disk rotating device 39 according to the second embodiment, similarly to the disk rotating device 33 according to the above-described first embodiment, the turntable 14 on which the disk body 2 is mounted uses the motor 5. As one of the constituent members of the rotor section 10, it is integrated with the rotor case 11 and the rotating shaft 21 by integral molding, so that the number of parts is reduced, which contributes to cost reduction and reduces the size in the axial direction. And the runout accuracy is further improved.

It should be noted that the shapes and structures of the respective parts shown in the above embodiments are merely examples of the embodiment to be carried out when carrying out the present invention, and the technical and technical features of the present invention will be described below. The scope should not be construed as limiting.

[0082]

As is apparent from the above description, the motor of the present invention comprises a stator having a stator coil,
A rotor case formed of a metal plate in a cylindrical shape having a short axial length, a rotor magnet fixed to an inner peripheral surface of the rotor case and facing the stator coil, and one end of the rotor case formed of a synthetic resin; A turntable fixedly attached to the turntable and rotatably supported by the stator, the turntable having a disk mounting surface for mounting the disk body integrally with the rotor case, The turntable and the turntable are combined by integral molding.

Therefore, in the motor of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the surface runout accuracy can be improved.

Since the turntable forms a part of the motor, the number of parts can be reduced and the size in the axial direction can be reduced.

According to the second aspect of the present invention, since the rotary shaft is fixed to the turntable by integral molding, the coaxiality between the rotary shaft and the turntable is improved, and the runout accuracy is improved. Can be improved.

According to the third aspect of the present invention, the reference projection protruding further outward from the outer peripheral surface of the turntable is formed at the end of the rotor case to which the turntable is connected. At the time of integral molding, the reference projection is pressed by the mold, and the position of the rotor case can be stabilized so as not to move due to the injection pressure of the resin material of the turntable.

Further, when mounted on a device such as a disk drive device, the reference projection is opposed to the retaining means provided on the device to prevent the rotor from falling off the stator due to impact or the like. Can be done.

According to the fourth aspect of the present invention, since the reference projection is formed in a ring shape over the entire circumference of the rotor case, the rigidity of the rotor case increases, thereby increasing the rotor case. , And eventually the deformation of the rotor portion becomes difficult, and the dimensional accuracy is improved, contributing to the improvement of the surface runout accuracy.

According to the fifth aspect of the present invention, since the rotor case is formed with a coupling hole and the synthetic resin for the turntable is filled in the coupling hole, the rotor case and the turntable are connected to each other. The coupling force between them is strengthened, and the strength of the rotor part can be improved.

According to the invention described in claim 6, since the concave portion is formed at the center of the disk mounting surface of the turntable, the concave portion is used to hold the disk body on the turntable. By incorporating the chucking mechanism described above, it is possible to configure a disk rotating device having a small size in the rotation axis direction.

The disk rotating device of the present invention is a disk rotating device for rotating a disk body, which is made of a synthetic resin and has a disk mounting surface on which the disk body is mounted, and a metal plate in an axial direction. A rotor case formed into a cylindrical shape having a short length and having the turntable coupled to one end thereof, a rotor magnet fixed to an inner peripheral surface of the rotor case, a rotating shaft fixed to the turntable, A stator having a stator coil rotatably supported and having a stator coil facing the rotor magnet, wherein the rotor case and the turntable are combined by integral molding.

Therefore, in the disk rotating device of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the surface runout accuracy can be improved.

Since the turntable forms a part of the motor, the number of parts can be reduced and the size in the axial direction can be reduced.

According to the invention described in claim 8, since the rotary shaft is fixed to the turntable by integral molding, the coaxiality between the rotary shaft and the turntable is improved, and the runout accuracy is improved. Can be improved.

According to the ninth aspect of the present invention, the reference projection protruding further outward from the outer peripheral surface of the turntable is formed at the end of the rotor case to which the turntable is connected. At the time of integral molding, the reference projection is pressed by the mold, and the position of the rotor case can be stabilized so as not to move due to the injection pressure of the resin material of the turntable.

Also, when mounted on a device such as a disk drive device, the reference projection is opposed to the retaining means provided on the device to prevent the rotor from falling off the stator due to impact or the like. Can be done.

In the invention according to claim 10,
Since the reference projection is formed in a ring shape over the entire circumference of the rotor case, the rigidity of the rotor case is increased, thereby making it difficult for the rotor case to be deformed and, consequently, the rotor portion to be deformed. And contributes to the improvement of surface runout accuracy.

In the invention described in claim 11,
A coupling hole is formed in the rotor case, and the coupling hole is filled with a synthetic resin of a turntable, so that the coupling force between the rotor case and the turntable is enhanced,
The strength of the rotor can be improved.

According to the twelfth aspect of the present invention,
Since a concave portion is formed at the center of the disk mounting surface of the turntable, a chucking mechanism for holding the disk body on the turntable using the concave portion is used to reduce the size in the rotation axis direction. It becomes possible to make it smaller.

The disk drive of the present invention is a disk drive for recording and / or reproducing information on the disk-shaped recording medium while rotating the disk-shaped recording medium. A turntable having a disk mounting surface to be mounted, a rotor case formed of a metal plate into a cylindrical shape having a short axial length and having one end coupled to the turntable, and fixed to an inner peripheral surface of the rotor case; Rotor magnet, a rotating shaft fixed to the turntable, and a stator portion rotatably supporting the rotating shaft and having a stator coil facing the rotor magnet, the rotor case and the turntable, Are combined by integral molding.

Therefore, in the disk drive device of the present invention, the relative accuracy between the rotor case and the turntable can be easily maintained, and the surface runout accuracy can be improved.

Further, since the turntable forms a part of the motor, the number of parts can be reduced and the size in the axial direction can be reduced.

In the invention according to claim 14,
Since the rotating shaft is fixed to the turntable by integral molding, the coaxiality between the rotating shaft and the turntable is improved, and the surface runout accuracy can be improved.

In the invention according to claim 15,
At the end of the rotor case where the turntable is joined, a reference projection projecting further outward from the outer peripheral surface of the turntable is formed, so that the reference projection is pressed by the mold during integral molding, The position of the rotor case can be stabilized so as not to move due to the injection pressure of the resin material of the turntable.

Further, by making the reference projection face the retaining means provided on the apparatus, it is possible to prevent the rotor from falling off the stator due to an impact or the like.

In the invention according to claim 16,
Since the reference projection is formed in a ring shape over the entire circumference of the rotor case, the rigidity of the rotor case is increased, thereby making it difficult for the rotor case to be deformed and, consequently, the rotor portion to be deformed. And contributes to the improvement of surface runout accuracy.

In the invention according to claim 17,
A coupling hole is formed in the rotor case, and the coupling hole is filled with a synthetic resin of a turntable, so that the coupling force between the rotor case and the turntable is enhanced,
The strength of the rotor can be improved.

In the invention according to claim 18,
Since a concave portion is formed at the center of the disk mounting surface of the turntable, a chucking mechanism for holding the disk body on the turntable using the concave portion is provided, whereby the rotation axis direction of the disk rotating device can be improved. Can be reduced in size.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an outline of an embodiment of a disk drive device of the present invention.

FIG. 2 shows an embodiment of the motor of the present invention together with FIGS. 3 to 5, which is a schematic longitudinal sectional view.

FIG. 3 is a plan view.

FIG. 4 is a sectional view showing a manufacturing process of the rotor part together with FIG. 5, and this figure shows a state immediately before clamping of a molding die.

FIG. 5 shows a state in which the molding die has been clamped and a synthetic resin has been injected into the molding die.

FIG. 6 shows a first embodiment of the disk rotating device of the present invention together with FIGS. 7 to 10; FIG. 6 shows a state in which a disk body is mounted on the left half, and FIG. It is a longitudinal cross-sectional view which shows the state which chucked the disk body.

FIG. 7 is a plan view.

8 shows a measurement method relating to surface runout together with FIG. 9, and is a diagram showing a relationship between a rotating shaft and a disk mounting surface. FIG.

FIG. 9 is a diagram showing measurement points.

FIG. 10 is a graph showing a measurement result of surface runout;

11 shows a second embodiment of the disk rotating apparatus according to the present invention, together with FIG.
This figure is a longitudinal sectional view showing a state where a disk is mounted on the left half and a state where the disk is chucked on the right half.

FIG. 12 is a plan view.

13 shows an example of a conventional disk rotating device together with FIG. 14 to FIG. 17, and this figure is a longitudinal sectional view.

FIG. 14 is a plan view.

FIG. 15 is a diagram showing a measurement method relating to surface runout of a conventional disk rotating device together with FIG. 16, and is a diagram showing a relationship between a rotating shaft and a disk mounting surface.

FIG. 16 is a diagram showing measurement points.

FIG. 17 is a graph showing measurement results of surface runout in a conventional disk rotating device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Disk drive device, 2 ... Disk-shaped recording medium (disk body), 3 ... Disk rotating device, 5 ... Motor, 6 ... Stator part, 7a ... Stator coil, 11 ... Rotor case, 12 ... Reference protrusion, 13 ... Coupling hole, 14: turntable, 16: coupling protrusion (portion filled in the coupling hole 13 of the synthetic resin), 17: disk mounting surface, 18: concave portion,
21: rotating shaft, 32: synthetic resin, 33: disk rotating device, 39: disk rotating device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H02K 21/22 H02K 21/22 MF term (Reference) 5D038 BA04 BA10 CA03 5D109 BA03 BA14 BA17 BA20 BA28 BA34 CA01 5H605 AA04 BB05 BB10 BB14 BB19 CC05 CC10 DD09 GG04 GG05 GG18 5H607 AA04 AA12 BB01 BB07 BB09 BB14 BB17 BB25 CC01 CC03 CC09 DD02 DD03 DD14 FF01 5H621 JK13

Claims (18)

[Claims] 1. A stator having a stator coil, a rotor case formed of a metal plate into a cylindrical shape having a short axial length, and a rotor magnet fixed to an inner peripheral surface of the rotor case and facing the stator coil. A turntable formed of a synthetic resin and integrally connected to one end of the rotor case and having a disk mounting surface for mounting a disk body, fixed to the turntable and rotatable by the stator; A motor comprising a supported rotating shaft, wherein the rotor case and the turntable are joined by integral molding. 2. The motor according to claim 1, wherein a rotation shaft is fixed to the turntable by integral molding. 3. The motor according to claim 1, wherein a reference projection is formed at an end of the rotor case to which the turntable is coupled, the reference projection protruding further from an outer peripheral surface of the turntable. 4. The motor according to claim 3, wherein the reference projection is formed in a ring shape over the entire circumference of the rotor case. 5. The motor according to claim 1, wherein a coupling hole is formed in the rotor case, and the coupling hole is filled with a synthetic resin for a turntable. 6. The motor according to claim 1, wherein a recess is formed in a center portion of the disk mounting surface of the turntable. 7. A disk rotating device for rotating a disk, comprising: a turntable made of synthetic resin and having a disk mounting surface on which the disk is mounted; and a metal plate having a short axial length. A rotor case formed in a shape and having the turntable coupled to one end thereof, a rotor magnet fixed to the inner peripheral surface of the rotor case, a rotating shaft fixed to the turntable, and a rotatable rotating shaft. And a stator portion having a stator coil opposed to the rotor magnet and wherein the rotor case and the turntable are combined by integral molding. 8. The disk rotation device according to claim 7, wherein a rotation shaft is fixed to the turntable by integral molding. 9. The disk rotation according to claim 7, wherein a reference projection protruding further outward from an outer peripheral surface of the turntable is formed at an end of the rotor case to which the turntable is connected. apparatus. 10. The rotor according to claim 9, wherein the reference projection is formed in a ring shape over the entire circumference of the rotor case.
A disk rotating device according to claim 1. 11. The disk rotating device according to claim 7, wherein a coupling hole is formed in the rotor case, and the coupling hole is filled with a synthetic resin for a turntable. 12. The turntable according to claim 7, wherein a concave portion is formed in a central portion of the disk mounting surface of the turntable.
A disk rotating device according to claim 1. 13. A disk drive device for recording and / or reproducing information on a disk-shaped recording medium while rotating the disk-shaped recording medium, the disk driving device being made of synthetic resin and mounting the disk-shaped recording medium. A turntable having a mounting surface, a rotor case formed of a metal plate in a cylindrical shape having a short axial length, and having the one end coupled to the turntable; A rotating shaft fixed to the turntable; and a stator portion rotatably supporting the rotating shaft and having a stator coil facing the rotor magnet, wherein the rotor case and the turntable are integrally formed and joined together. A disk drive device characterized by being performed. 14. The disk drive according to claim 13, wherein a rotary shaft is fixed to the turntable by integral molding. 15. The disk drive according to claim 13, wherein a reference projection protruding further from an outer peripheral surface of the turntable is formed at an end of the rotor case to which the turntable is connected. apparatus. 16. The device according to claim 1, wherein the reference projection is formed in a ring shape over the entire circumference of the rotor case.
6. The disk drive according to 5. 17. The disk rotation device according to claim 13, wherein a coupling hole is formed in the rotor case, and the coupling hole is filled with a synthetic resin for a turntable. 18. The turntable according to claim 1, wherein a concave portion is formed in a central portion of a disk mounting surface of the turntable.
4. The disk drive according to 3.