JP3589145B2 - Spindle motor and method of ejecting removable disk - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a mechanism for ejecting a removable disk of a spindle motor for a removable disk device, and more particularly to a mechanism for smoothly removing a media hub from a spindle hub when ejecting a removable disk.
[0002]
[Prior art]
A conventional spindle motor for a removable disk device will be described with reference to FIG. The conventional spindle motor for a removable disk device is provided at the center of the media hub 41 by an outer diameter wall 5b of a protruding portion 5a (having a substantially cylindrical shape and seen as a circle when viewed from above) on the upper surface of the spindle hub 5. It has a structure that directly restricts the inner diameter of the hole. That is, the position of the inner diameter wall surface 411 is regulated by the protrusion 5 a of the spindle motor 5.
[0003]
Therefore, if the clearance between the outer diameter of the spindle hub 5 and the inner diameter of the media hub 41 is reduced in order to reduce the eccentricity of the magnetic storage medium, inconvenience occurs when the removable disk 4 is ejected. That is, in FIG. 9, when the shell 43 moves rightward, the round hole edge 44 hits the tapered portion 412. As a result, when the media hub 41 is pushed upward, "scoring" described below easily occurs.
[0004]
Here, FIG. 10 is a diagram illustrating a positional relationship between the inner diameter wall surface 411 and the spindle hub 5 (the outer diameter wall surface 5b) when the media hub 41 is pushed up to generate “scoring”. B and C are the ends of the center cross section of the spindle hub 5, and the length BC indicates the outer diameter, that is, the length of the cylindrical diameter. A and D are points at the corners of the inner diameter wall surface 411, and the length AD indicates the inner diameter of the hollow portion of the media hub 41.
[0005]
Then, as shown in FIG. 10, there is a relation AD <BC between the inner diameter AD of the hole and the outer diameter BC of the protruding portion 5a, and when the direction of AB is parallel to the vertical direction of the inner diameter wall surface 411, the length is longer. AD-BC is the sum of the clearances on both sides. Therefore, if the inner wall surface 411 and the AB on the outer wall surface of the spindle hub 5 are parallel, and the spindle hub 5 is fixed, and the media hub 41 is lifted in parallel with the AB of the spindle hub 5, the lifting is performed without any problem. However, if the inner wall surface 411 is inclined with respect to the spindle hub 5 (AB direction) as shown in FIG. 10, a phenomenon occurs in which the point C enters the inner surface of the inner wall surface 411 and does not move, and this phenomenon will be described below. , Will be referred to as "kaziri".
[0006]
This phenomenon occurs when the inner wall surface is tilted to such an extent that AD <AC. In other words, when the media hub 41 is lifted, this phenomenon occurs when the timing at which the corner D crosses the corner C is late.
[0007]
If the galling occurs, the friction occurs between the spindle hub 5 and the media hub 41 so that the media hub 41 cannot be pulled out and pulled out, so that the media hub 41 does not come off the spindle hub 5 and the removable disk 4 cannot be ejected. There is also a problem that the inner wall surface 411 of the media hub 41 is damaged.
[0008]
[Problems to be solved by the invention]
The first problem is that when ejecting a removable disk, the media hub 41 does not come off the spindle hub 5 and does not move. The reason is that, when the inner wall surface 411 is inclined with respect to the spindle hub 5 (AB direction), there occurs a phenomenon that the point C bites into the inside of the inner wall surface 411 and does not move.
[0009]
The second problem is that if the removable disk is forcibly ejected in a state where a galling has occurred, the inner wall surface 411 of the media hub 41 is damaged.
[0010]
The reason is that, when the inner diameter wall surface 411 is inclined with respect to the spindle hub 5 (AB direction), the point C penetrates into the inner diameter wall surface 411 to cause further plastic deformation.
[0011]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a spindle motor in which a media hub can be smoothly removed from a spindle hub when the removable disk is ejected without causing galling.
[0012]
[Means for Solving the Problems]
The spindle motor according to the present invention is mounted with a removable disk including a disk-shaped rotary recording medium, a substantially donut-shaped media hub fixed to the recording medium, and a shell accommodating these and having a hole in the center. In a spindle motor that rotates the recording medium, the cross-sectional shape has a U-shaped media hub holding unit, and a suction unit that suctions the media hub downward, and the media hub is provided with a tapered portion, When the removable disk is mounted, the suction means sucks the media hub downward, and the media hub holding means has one end pressed by the media hub and the other end. Is located between the cylindrical protrusion of the spindle motor and the inner diameter wall of the hole at the center of the media hub. Restrain horizontal movement of the serial inner diameter wall, wherein the time of ejection of the removable disk, along with moving the media hub upward by the edges of holes in the shell presses the tapered portion of the media hub, the media hub Is moved toward the center of the cylindrical protrusion of the spindle motor, and the media hub holding means rotates around a base of one side of the U-shape to which the other end belongs as a fulcrum. The other end moves toward a center of a cylindrical protrusion of the spindle motor.
[0013]
A removable disk ejecting method according to the present invention is directed to a removable disk including a disk-shaped rotary recording medium, a substantially donut-shaped media hub fixed to the recording medium, and a shell accommodating these and having a hole in the center. Wherein the spindle motor rotates the recording medium and ejects the removable disk, wherein the spindle motor sucks the media hub downward in a U-shape in cross section. And a taper portion is provided on the media hub, and when the removable disk is mounted, the suction device sucks the media hub downward, and one of the media hub holding devices. The end is pressed against the media hub, and the other end of the media hub holding means is One end is located between the cylindrical protrusion of the spindle motor and the inner wall surface of the hole at the center of the media hub to restrain the inner wall surface from moving in the horizontal direction. The edge of the hole of the shell pushes the tapered portion of the media hub to move the media hub upward, and a part of the media hub moves toward the center of the cylindrical protrusion of the spindle motor. Moving, and the media hub holding means rotates around the base of one side of the U-shape to which the other end belongs as a fulcrum, so that the other end has a cylindrical shape of the spindle motor. Moving toward the center of the protrusion.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the first embodiment of the present invention will be described in detail.
[0017]
With reference to FIG. 1, the configuration of a spindle motor for a removable disk device according to the present invention will be described. FIG. 1B shows the positions of main parts such as the claws 2 when the spindle hub 1 is viewed from above, and only the upper half is shown. Although the lower half is not shown, it has a symmetrical shape with respect to BB 'with the upper half. Therefore, the claw 2 exists in three places. As can be seen from this figure, the claws 2 are arranged in such a manner that the claws 2 are fitted in a part of the spindle hub 1. FIG. 1A shows a cross section taken along the line BB ′ in FIG.
[0018]
The spindle motor for a removable disk according to the present invention has a spindle hub 1 and a rectangular shape when viewed from above, and a pair of parallel two sides thereof are arranged substantially in the center direction from near the outer peripheral end of the spindle hub 1. The spindle hub 1 includes a plurality of claws 2 equally arranged on a concentric circle of the spindle hub 1 and a donut-shaped magnet 3 corresponding to the claws 2 and arranged concentrically with the spindle hub 1. The claw 2 has a U-shaped cross section when viewed from the direction of A in FIG. 1B (see FIG. 1A), and the spindle hub 1 is rotatable about a fulcrum 21. And has one end 22 and the other end 23.
[0019]
When a removable device such as a read / write device operates, the spindle motor rotates, and at this time, the spindle hub 1, the claw 2, the media hub 41, the magnetic recording medium 42, and the magnet 3 rotate integrally. The spindle motor also includes a bearing 6 for rotating the spindle hub 1, a fixed base 7 for holding the bearing, and the like. These are well known to those skilled in the art, and are not the core of the present invention. I do.
[0020]
Next, the operation of the embodiment of the present invention will be described.
[0021]
1A and 1B are a cross-sectional view and a plan view, respectively, showing a state in which a removable disk 4 is inserted into a spindle motor for a removable disk device according to the present invention. The removable disk 4 is provided with a double-sided adhesive tape 46 on a media hub 41 (made of stainless steel, for example) and a central region of the media hub 41 (a portion surrounded by two concentric circles; see FIG. 1A). A disk-shaped magnetic storage medium 42 is affixed, and a shell 43 for accommodating the magnetic storage medium 42 is provided. A round hole 44a through which the media hub 41 is exposed is provided at the center of the lower surface of the shell 43. I have.
[0022]
The magnetic recording medium 42 is fixed to the media hub 41 via a double-sided adhesive tape 46. When the removable disk 4 is not mounted on the spindle motor, the media hub 41 can move in the round hole 44a. I have.
[0023]
In the media hub 41, the inner wall surface 411 of the hole provided at the center is restrained in the horizontal direction by the other end 23 of the claw 2, and the magnetic force of the magnet 3 causes the media hub 41 to move vertically (in FIG. It is sucked in the downward direction) and positioned and fixed. At this time, one end 22 of the claw 2 is pressed by the media hub 41, so that the other end 23 of the claw 2 does not move.
[0024]
Next, as shown in FIG. 2, when the removable disk 4 moves rightward in the drawing for ejection, the round hole edge portion 44 comes into contact with the tapered portion 412 of the media hub 41.
[0025]
Further, as shown in FIG. 3, when the removable disk 4 is moved rightward in the drawing for ejection, the media hub 41 is pushed together with the magnetic recording medium 42 because the tapered portion 412 is pushed by the round hole edge 44. . At this time, a gap is generated between the media hub 41 and one end 22 of the claw 2. However, because of the small gap, it does not appear in FIG.
[0026]
Next, FIG. 4 shows that the other end 23 of the claw 2 is pushed against the inner wall surface 411 of the media hub 41, and the claw 2 is about to rotate about the fulcrum 21. When the rotation starts, the other end 23 of the claw 2 falls down in the direction toward the center of the spindle hub 1, and the media hub 41 relaxes the restraining force of the other end 23 of the claw 2 in the horizontal direction. The hub 41 also moves upward while slightly moving to the right (discharge direction) in the drawing, so that the hub 41 can be smoothly separated from the spindle hub 1 without causing galling. Here, the reason for smooth removal without occurrence of galling is that the length corresponding to BC in FIG. 10 becomes smaller due to the rotation of the claw 2, and as a result, the length of AC becomes smaller. This is because they are no longer satisfied.
[0027]
Then, as shown in FIG. 5, the media hub 41 is further lifted to a range where the attraction by the magnetic force of the magnet 3 does not reach.
[0028]
Subsequently, as shown in FIGS. 6 and 7, the removable disk 4 is discharged while the media hub 41 and the spindle hub 1 are rubbed smoothly.
[0029]
Advantageous Effects of Invention The spindle motor for a removable disk device according to the present invention has an operation and effect that a media hub can be smoothly detached from the spindle hub without causing galling when the removable disk is ejected.
[0030]
In the embodiment of the present invention, three U-shaped rotatable claws are provided. However, four or six equally-spaced nails may be provided, for example, to suppress eccentricity of the magnetic storage medium. Any arrangement is acceptable. In addition, the operation of the present invention is possible even in the case of two places.
[0031]
Also, the claw that restrains the inner diameter wall surface of the media hub may not be in a U-shape as long as it is linked with the ejection operation of the removable disk.
[Explanation of effects]
In the spindle motor for a removable disk device according to the present invention, the reliability of the removable disk device is improved because the media hub is smoothly separated from the spindle hub when the removable disk is ejected without causing galling.
[0032]
In addition, there is also an effect of preventing a phenomenon in which the inner diameter wall surface 411 of the media hub 41 is damaged by trying to forcibly eject the removable disk in a state where a galling has occurred.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view and a top view showing a configuration of an embodiment of the present invention.
FIG. 2 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 4 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 5 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 6 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 7 is a diagram illustrating an operation of ejecting a removable disk according to the embodiment of the present invention.
FIG. 8 is a sectional view showing a configuration of a conventional removable spindle.
FIG. 9 is a diagram showing an operation of ejecting a removable disk of a conventional removable spindle motor.
FIG. 10 is a view showing a state in which galling occurs in a discharging operation of a removable disk of a conventional removable spindle motor.
[Explanation of symbols]
Reference Signs List 1 spindle hub 2 claw 21 fulcrum 22 one end 23 other end 3 magnet 4 removable disk 41 media hub 411 inner diameter wall surface 42 magnetic recording medium 43 shell 44 round hole edge 45 center pin 46 double-sided adhesive tape 5 spindle hub 5a projecting portion 5b Outer diameter wall 6 Bearing 7 Base plate

Claims (2)

A removable disk including a disk-shaped rotary recording medium, a substantially donut-shaped media hub fixed to the recording medium, and a shell containing these and having a hole in the center is mounted to rotate the recording medium. The spindle motor
The media hub has a U-shaped cross section and suction means for sucking the media hub downward, and the media hub is provided with a tapered portion,
When the removable disk is mounted, the suction means sucks the media hub downward, and the media hub holding means has one end pressed by the media hub and the other end. Is located between the cylindrical protrusion of the spindle motor and the inner diameter wall of the hole at the center of the media hub to restrain the horizontal movement of the inner diameter wall,
When the removable disk is ejected, the edge of the hole of the shell pushes the tapered portion of the media hub to move the media hub upward, and a part of the media hub forms a cylindrical protrusion of the spindle motor. The media hub holding means moves around the root of one side of the U-shape to which the other end belongs, so that the other end is rotated by the center of the spindle motor. A spindle motor that moves toward the center of a protrusion of the shape. A removable disk including a disk-shaped rotary recording medium, a substantially donut-shaped media hub fixed to the recording medium, and a shell containing these and having a hole in the center is mounted to rotate the recording medium. Ejecting said removable disk from a spindle motor to be driven,
The spindle motor has a media hub holding means having a U-shaped cross section and suction means for sucking the media hub downward, and the media hub is provided with a tapered portion,
When the removable disk is mounted, the suction unit sucks the media hub downward, and one end of the media hub holding unit is pressed by the media hub, and the other end of the media hub holding unit is pressed. Has one end between a cylindrical protrusion of the spindle motor and an inner diameter wall of a hole at the center of the media hub to restrain horizontal movement of the inner diameter wall,
When ejecting the removable disk,
The edge of the hole of the shell pushes the tapered portion of the media hub to move the media hub upward, and a part of the media hub moves toward the center of the cylindrical protrusion of the spindle motor. Steps and
By rotating the media hub holding means around a base of one side of the U-shape to which the other end belongs as a fulcrum, the other end is directed toward a center of a cylindrical protrusion of the spindle motor. Moving to a removable disk.

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