JP3294483B2 - Disk mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk mounting device for rotating a disk (magnetic storage medium) such as a floppy disk.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing a conventional disk mounting device. In FIG. 6, a cartridge case and the like made of synthetic resin for protecting the disk are not shown.

As shown in FIG. 6, a plurality of drive coils 2 are provided on a substrate 201 which is a stator member of a spindle motor.
Numerals 02 are arranged on the same circumference, and a rotor magnet 203 is rotatably arranged facing the drive coil 202. This rotor magnet 203 is press-fitted and fixed to a rotating shaft 204 supported on a substrate 201,
When power is supplied to the drive coil 202 at a predetermined phase, the drive coil 202 rotates in the direction indicated by the arrow. A disk-shaped rotor yoke 205 is press-fitted and fixed to the rotation shaft 204, and the rotor magnet 203, the rotation shaft 204 and the rotor yoke 20 are fixed.
5 and the like constitute a rotation drive unit of the spindle motor. A chuck magnet 206 is mounted on the upper surface of the rotor yoke 205, and a support plate 207 is fixed below the rotor yoke 205.
The drive pin 210 erected on the upper surface protrudes from the upper surface of the rotor yoke 205.

[0004] On the other hand, a disk 209 as a magnetic recording medium is housed inside a disk cartridge (all not shown) loaded in the disk mounting device, and a hub 208 is mounted at the center of the disk 209. I have. The hub 208 is made of a metal material such as iron that is attracted to the chuck magnet 206 when the hub 208 is loaded in the disk mounting device. Also, as shown in FIG.
At the center of the hub 208, a chucking hole 211, which is a rectangular opening into which the rotating shaft 204 can be inserted, is provided, and at the periphery thereof, a rectangular positioning hole 212 for inserting the drive pin 210 is provided. .

FIG. 7A shows a state immediately after the disk cartridge is loaded in the disk loading device. In this case, the drive pin 210 and the positioning hole 212 often do not coincide with each other. ,
The drive pin 210 needs to be fitted in the positioning hole 212. Therefore, when the rotation drive unit of the motor such as the rotor magnet 203 and the rotor yoke 205 is rotated with the disk cartridge stopped, the drive pin 210 rotates in the direction of the arrow, as shown in FIG. Positioning hole 2 during one rotation of drive pin 210
12. When the drive pin 210 further rotates,
As shown in FIG. 7C, the drive pin 210 comes into contact with the side wall of the positioning hole 212 to complete the positioning. In this state, the hub 208 is attached to the chuck magnet 2
06 is attracted by magnetic force, and the hub 208 is held in close contact with the chuck magnet 206.

[0006]

However, in the above-described conventional disk mounting apparatus, the drive pin 21 is attached to the hub 208 immediately after the disk cartridge is loaded.
When 0 is not fitted, since the drive pin 210 remains protruding from the upper surface of the rotor yoke 205, the drive pin 210 pushes up a part of the periphery of the hub 208, and the positioning is performed while rotating the drive pin 210 in this state. It will fit into the hole 212. Therefore, the driving pin 2
In the process of fitting the disk 10 into the positioning hole 212, the disk 209 is rotated while being tilted, and there is a possibility that the subsequent writing or reading of data may be abnormal.

As another conventional example, a through hole is provided in a rotor yoke, and an arm having driving pins provided on the back surface of the rotor yoke is attached in a cantilever manner, and this arm is attracted by magnetic force from a chuck magnet. There has been proposed a disk mounting apparatus which performs the above operation (Japanese Patent Laid-Open No. 2-1996).
No. 61). According to such a disk mounting device, when the drive pin is not fitted in the positioning hole of the hub, the drive pin protruding from the upper surface of the rotor yoke is pressed by the hub to sink, and the chuck magnet provided through the through hole is provided. By returning the arm with a magnetic force from the drive pin, the drive pin can be fitted into the positioning hole. However, since the magnetic force from the chuck magnet provided on the upper surface of the rotor yoke is applied to the arm provided on the back surface of the rotor yoke through the through hole, the magnetic force from the chuck magnet is applied to the arm. And the drive pin cannot be fitted into the positioning hole due to the poor return of the arm.

SUMMARY OF THE INVENTION The present invention has been made in view of such a situation of the prior art, and has as its object to provide a disk mounting apparatus in which a drive pin can be securely inserted into a positioning hole of a disk and does not malfunction. It is an object.

[0009]

In order to achieve the above-mentioned object, the present invention provides a disk rotation drive unit for a motor using a rotating shaft, a rotor yoke, and the like, and a disk is driven by a chuck magnet fixed on a flat surface of the rotor yoke. A disk mounting device for sucking a hub and rotating a disk by locking a drive pin in a positioning hole provided in the hub, wherein the movable arm is bored in the flat surface.
Together with fitted in the opening it is loosely fitted in between said chuck magnet rotor yoke is arranged to be swingable at least vertically, with the driving pin is exposed through the front Symbol chuck magnet, the chuck is provided with a suction member which is magnetically attracted to the back surface of the magnet, Ru der which the chuck magnet is disposed so as to cover at least a portion of said movable arm.

In the above configuration, the movable arm is
It includes the drive pin, a positioning portion for the rotor yoke, and a mounting portion for mounting the suction member, and these can be integrally formed of a synthetic resin. Further, the suction member and the movable arm can be integrated by outsert.

[0011]

[0012]

[0013]

According to the above-mentioned means, the opening formed in the flat surface is provided.
The movable arm that fits in the mouth and is loosely fitted between the chuck magnet and the rotor yoke does not apply an urging force against the pressing force to the hub, unlike the interposition of an elastic member. When the disc is loaded, the drive pin can be pushed down by the hub without applying excessive force to the disc.When the drive pin is inserted into the positioning hole of the hub, the suction member of the movable arm is attached to the chuck magnet. Since the drive pins can be reliably attracted by the magnetic attraction force and the drive pins can be exposed to the maximum extent, the tilt of the disc due to the drive pins does not occur, and the disc can be driven to rotate stably.

Here, if the movable arm is integrally formed of synthetic resin in a state including the drive pin, the positioning portion, the mounting portion, and the like, the drive pin does not damage the hub, so that generation of abnormal noise and foreign matter can be reduced. In addition, the number of parts can be reduced, and the cost can be reduced. In particular, when the suction member and the movable arm are integrated by outsert,
These can be handled as one part, and the cost can be significantly reduced.

[0015]

[0016]

[0017]

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

FIG. 1 is an exploded perspective view showing a main part of a disk mounting apparatus according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the disk mounting apparatus, and FIG. 3 is a diagram showing a chuck magnet and a swing arm shown in FIG. It is a top view showing an engagement state. FIGS. 4A, 4B, and 4C are a plan view, a front view, and a rear view, respectively, showing a detailed configuration of the swing arm of FIG.

As shown in FIG. 1, a rotor yoke 101, which is a rotary drive unit of a spindle motor, has a disk shape, and a rotor magnet is disposed inside thereof so as to face a coil (not shown) on a stator side. Have been. Rotor yoke 1
Reference numeral 01 denotes a turntable unit 1 which is press-fitted and fixed to the rotating shaft 102, and which is circular and flat around the rotating shaft 102.
03 is formed by press working or the like. A ring-shaped chuck magnet 104 is fixed to the upper surface of the turntable unit 103 using an adhesive, a screw, or the like.
Upper surface of turntable 103 and chuck magnet 1
Swing arm 10 as a movable arm
5 are interposed.

As shown in FIG. 4, the swing arm 105 is made of an integrally processed synthetic resin having a U-shaped projecting portion and horizontally extending portions on both sides thereof.
The portion protruding in a letter shape forms the suction member mounting portion 105b, one of the horizontally extending portions forms the drive pin 106a, and the other forms the positioning pin 106b. A metal plate 1 as a suction member is provided on the suction member mounting portion 105b.
07 is mounted, and the metal plate 107 is made of a magnetic material such as iron or an alloy containing iron that can be attracted by the chuck magnet 104. The metal plate 107 is provided with claw claws 107a on both ends, and after penetrating the claws 107a through the suction member mounting portion 105b, as shown in FIG.
Bend the ends outward and secure. Further, a protruding piece 105c is provided at an end of the positioning pin 106b,
The projecting piece 105c fits into the opening 110 on the turntable unit 103. A hole 105a is formed in the center of the positioning pin 106b, and the pin 109 of the turntable 103 is fitted into the hole 105a.

In order to position the swing arm 105, an elliptical opening 108 and a pin 1 located near one end of the opening 108 are formed in the turntable 103.
09 and a square opening 110 adjacent the pin 109
Are provided. Similarly, the drive pin 10 of the swing arm 105 is provided on the chuck magnet 104 side.
6a and the positioning pin 10
An elliptical opening 112 into which 6b is fitted is provided. In addition, a pin (not shown) for preventing idling with the turntable unit 103 is provided on the lower surface of the chuck magnet 104, and a hole 11 for fitting the pin is provided.
3a and 113b are provided on the turntable unit 103.

Here, the procedure for assembling the chuck magnet 104 and the swing arm 105 to the disk mounting device will be described. First, as shown in FIG. 1, the swing arm 105 is placed on the turntable 103 with the metal plate 107 on the upper side. Take it and insert pin 109 into hole 1
The swing arm 105 is positioned on the turntable 103 by fitting the suction member mounting portion 105b into the opening 108. Next, the adhesive is applied in several spots so as not to touch the swing arm 105, and then the chuck magnet 104 is brought above the turntable 3, and the rotary shaft 102 is passed through the center hole 104a, and the drive is performed. The chuck magnet 104 is bonded and fixed on the turntable 3 with the pin 106a passed through the opening 111 and the positioning pin 106b passed through the opening 112. At this time, the chuck magnet 10
The two pins on the lower surface of the turntable 4
3a, 113b.

As shown in FIGS. 2 and 3, when the chuck magnet 104 and the swing arm 105 are engaged, the swing arm 105
06a is exposed in the opening 111 and the positioning pin 1
06b is exposed in the opening 112 and the pin 109
Are fitted in holes 105a provided in the positioning pins 106b. When the chuck magnet 104 attracts the metal plate 107, the swing arm 105
Are held on the back surface of the chuck magnet 104.

Therefore, as shown in FIG. 7A, when the drive pin 106a does not coincide with the positioning hole of the hub, the drive pin 106a is pressed by the hub, and the entire swing arm 105 is chucked. The drive pin 106 a is separated from the turntable 103 by being pulled away against the magnetic attraction force of the magnet 104. Then, as shown in FIG. 7B, the drive pins 106a
Is aligned with the positioning hole, the chuck magnet 1
04, the metal plate 107 is attracted to the back surface of the chuck magnet 104 by the magnetic attraction force of the drive pin 106a.
Project from the turntable section 103 and fit into the positioning holes. As described above, since the swing arm 105 is swingably disposed between the upper surface of the turntable portion 103 and the chuck magnet 104, the drive pin 106a is in contact with the lower surface of the hub immediately after loading the disk cartridge. In this case, the drive pin 106a does not forcibly push up the disk, and there is no danger that data writing or reading will be abnormal unlike the related art.
Further, since the magnetic attraction force from the chuck magnet 104 directly acts on the metal plate 107 of the swing arm 105, when the drive pin 106a is aligned with the positioning hole, the swing arm 105 moves
4 can be reliably restored by the magnetic attraction force, and it is possible to prevent a malfunction in which the drive pin 106a is not fitted into the positioning hole. Further, since the swing arm 105 including the drive pin 106a is integrally formed of a synthetic resin, the hub is hardly damaged, and not only can abnormal noise and foreign substances be significantly reduced, but also the number of parts can be reduced.

FIG. 5 is a sectional view of a main part of a disk mounting device according to a reference example of the present invention.

The swing arm 105 according to the embodiment described above is used.
To the chuck magnet 104 and the turntable unit 103
In contrast to the structure in which the structure is simply loosely fitted therebetween, in the present reference example, one end is fixed to the rotor yoke 101 in a cantilever manner. That is, as shown in FIG. 5, the swing arm 114 has a long plate shape, one end of which is swingably supported by a fixed pin 115 attached to the rotor yoke 101, and the other end of which is provided with a drive pin 116. Have been. The drive pin 116 is made of a synthetic resin molded product so as not to generate burrs and the like, and its tip is exposed from the chuck magnet 104. Further, on the upper surface of the swing arm 114, a suction member 117 made of an iron plate (or an alloy containing iron) or a magnet is fixed.
It is attached so as to be hidden on the back of the 04.

[0027] In the reference example of FIG. 5, since the one end of the swing arm 114 is fixed in a cantilever on the back surface of the rotor yoke 101, assembled only by mounting the chuck magnet 104 on turntable 103 of the rotor yoke 101 Is completed. Also in this case, the chuck magnet 104 is fixed using an adhesive, a screw, or the like.

In the reference example of FIG. 5, when the positioning hole of the hub is not aligned with the drive pin 116 when the disk cartridge is loaded in the disk loading device, the drive pin 116 is pushed down by the hub, forcing the hub. Without pushing up, the chuck magnet 104
During rotation, the drive pin 116 is
To fit. This state is shown in FIG. 5, and since the drive pin 116 is not restrained by the hub, the suction member 11
7 is attracted to the chuck magnet 104 and closely adheres to the lower surface. As a result, the swing arm 114 is fixed to the chuck magnet 104, and the drive pin 116 is in the most exposed state.

Also in this reference example, since the magnetic attraction force from the chuck magnet 104 directly acts on the attraction member 117 fixed to the swing arm 114, when the drive pin 116 coincides with the positioning hole, the swing arm 114 is moved. The magnetic chucking force from the chuck magnet 104 makes it possible to surely return, and stable rotation can be obtained. Further, since the drive pin 116 is formed of a synthetic resin, the hub is hardly damaged, and noise and foreign matters can be significantly reduced. Furthermore, since only the drive pin 116 is exposed from the chuck magnet 104, the opening in the chuck magnet 104 can be minimized, and the entry of dust and the like from the outside into the motor can be reduced.

[0030] It should be noted that, in the real施例and reference the above example,
Although the description has been given of the case where the metal suction member is attached to the synthetic resin swing arm using caulking or the like, it is also possible to integrate these swing arm and the suction member by outsert molding, in which case, The swing arm and the suction member can be handled as one component.

[0031]

As described above, according to the present invention,
Movable arm is arranged closer to be swingable at least vertically and is loosely fitted between the then fitted into an opening drilled into a flat surface Chi <br/> catcher click magnet and b Tayoku, Ji catcher click magnet A drive pin that penetrates and is exposed, and an attracting member that is magnetically attracted to the back surface of the chuck magnet are provided, and the chuck magnet is disposed so as to cover at least a part of the movable arm,
Unlike the elastic arm, the movable arm loosely fitted between the chuck magnet and the rotor yoke does not apply an urging force against the pressing force to the hub, and does not exert an excessive force on the disc. When the disc is loaded, the drive pin can be pushed down by the hub when the disc is loaded, and when the drive pin is inserted into the positioning hole of the hub, the suction member of the movable arm is securely held by the magnetic attraction of the chuck magnet. , And the drive pins can be exposed to the maximum, so that the tilt of the disk due to the drive pins does not occur and the disk can be driven to rotate stably.

Further, if the movable arm is integrally formed of synthetic resin in a state including the drive pin, the positioning portion, the mounting portion and the like, the drive pin does not damage the hub, so that generation of abnormal noise and foreign matter can be reduced. At the same time, the number of parts is reduced, and the cost can be reduced. In particular, when the suction member and the movable arm are integrated by outsert, they can be handled as one component, and the cost can be significantly reduced.

[0033]

[0034]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main part of a disk mounting device according to an embodiment of the present invention.

FIG. 2 is a sectional view of the disk mounting device.

FIG. 3 is a plan view showing an engagement state between a chuck magnet and a swing arm shown in FIG. 2;

FIG. 4 shows the details of the swing arm of FIG. 2;
Is a plan view, (b) is a front view, and (c) is a back view.

FIG. 5 is a sectional view of a main part of a disk mounting device according to a reference example of the present invention.

FIG. 6 is a front view showing a conventional disk mounting device.

FIG. 7 is an explanatory view showing a process up to completion of positioning by a drive pin of the disk mounting device of FIG. 6;

[Explanation of symbols]

 Reference Signs List 101 Rotor yoke 102 Rotating shaft 103 Turntable part (flat surface) 104 Chuck magnet 105 Swing arm (movable arm) 105a Hole 105b Suction member mounting part 105c Projecting piece 106a Drive pin 106b Positioning pin 107 Metal plate (suction member) 109 Pin 108, 110, 111, 112 Opening 114 Swing arm (movable arm) 115 Fixed pin 116 Drive pin 117 Suction member

Claims (3)

(57) [Claims] A rotating shaft, a rotor yoke, and the like are used as a disk rotation driving unit of a motor. A chuck of a disk is attracted by a chuck magnet fixed on a flat surface of the rotor yoke, and a driving pin is inserted into a positioning hole provided in the hub. Wherein the movable arm is fitted into an opening formed in the flat surface.
Together are arranged swingably at least said movable arm in the vertical direction is loosely fitted between the input and to the said chuck magnet and the rotor yoke, and the driving pin is exposed through the front Symbol chuck magnet, wherein A disk mounting device, comprising: a chuck member that is magnetically attracted to a back surface of the chuck magnet; and the chuck magnet is disposed so as to cover at least a part of the movable arm. 2. The device according to claim 1, wherein the movable arm includes the driving pin, a positioning portion for the rotor yoke, and a mounting portion for mounting the suction member.
A disk mounting device, wherein these are integrally formed of synthetic resin. 3. The disk mounting device according to claim 2, wherein the suction member is integrated with the movable arm by outsert.