JPH0356910Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a disk drive device for recording or reproducing signals using a microfloppy disk or a similar disk cartridge. This relates to the relationship between a rotary table and a leaf spring that supports a drive protrusion generally called a drive pin.

[Conventional technology]

2. Description of the Related Art Magnetic disks with a diameter of about 86 mm (about 3.5 inches) called microfloppy disks and devices for recording or reproducing data using the magnetic disks are well known. As shown in FIG. 9, a floppy disk or magnetic disk cartridge 1 is constructed by housing a recording medium disk 2 in a rigid synthetic resin case 3. The case 3 has a head insertion opening 7, which is closed by a sliding shutter 8 when not in use. The disk 2 of this disk cartridge 1 consists of a magnetic sheet 2a and a hub 2b made of a metal plate attached to the center of the magnetic sheet 2a. Disk 2 is not rotated by pressing it with a clamper, so
An opening 9 for exposing the hub 2b is provided on one surface of the case 3, and the hub 2b is exposed from this. This hub 2b has a spindle insertion hole 1.
0a and a driving protrusion insertion hole 10b are provided.

The chucking mechanism for holding and rotating the disk 2 shown in FIG. 9 is known, for example, from Japanese Utility Model Application No. 60-163547, and as shown in FIG. A drive protrusion 13, generally called a drive pin or drive button, is provided adjacent to this, and a permanent magnet 14 for attracting the magnetic metal hub 2b at the center of the disk 2 is mounted on the rotary table 11. It is constructed by fixedly arranging the In addition, drive protrusion 1
3 is supported by a leaf spring 15 so as to be elastically displaced in its axial direction, disk radial direction, and circumferential direction.

The plate spring 15 has a portion 1 attached to the lower surface of the central portion of the rotary table 11, as shown in FIG. 13, for example.
5a, a peripheral edge portion 15b extending in an arc shape along the periphery of the rotary table 11, and a portion 15c protruding toward the center of the rotary table 11 from the peripheral edge portion 15b, and the driving protrusion 13 is supported by the protruding portion 15c. ing.

When the disk 2 is mounted on the disk rotating table 11, the cartridge 1 is loaded so that the hole 10a of the hub 2b and the spindle 12 are aligned.
However, the driving protrusion 13 does not necessarily coincide with the hole 10b. If the drive protrusion 1 is located in a part other than the hole 10b,
3 is located, the hub 2b is attracted by the magnet 14, so the hub 2b presses the top surface of the drive protrusion 13. As a result, the arcuate portion 1 of the leaf spring 15
5b and the radially extending portion 15c are elastically deformed, and the drive protrusion 13 is pushed up in the direction away from the hub 2b. When the rotary table 11 rotates in the direction of the arrow 29 in FIG. 10 in this state, the position of the drive protrusion 13 moves clockwise and finally coincides with the position of the hole 10b. As a result, the leaf spring 15
The driving protrusion 13 enters into the hole 10b at the position shown by the dotted line with the restoring force. Edge 30 on the outer peripheral side of the hole 10b
That is, the lower side of the substantially rectangular hole 10b in FIG. 10 is formed so as to approach the spindle insertion hole 10a as it goes clockwise in FIG. In other words, the distance from the center of the hub 2b to the edge 30 is the lowest at D1. For this reason, the driving protrusion 13
When it is displaced clockwise in FIG. 10, it finally comes into contact with the edge 30, and the edge 30 presses the driving protrusion 13 toward the center of the hub 2b. When the drive protrusion 13 contacts point D1, it is most strongly pressed toward the center of the hub 2b. At this time, the drive protrusion 13
It also contacts point D2 and transmits rotation to the hub 2b. Note that the spindle 12 contacts points S1 and S2 of the hole 10a.

[Problem that the invention attempts to solve]

By the way, the leaf spring 1 is centered around the driving protrusion 13.
5 is formed symmetrically, that is, supported on both sides, the inclination of the drive protrusion 13 when the disk rotates is reduced. However, if the leaf spring 15 is formed in a cantilevered structure as shown in FIG. 13 or asymmetrically as shown in FIG. 14 in order to save material, the inclination of the driving projection 13 becomes large. The inclination increases when the leaf spring 15, which has a circular periphery, is in contact with the lower surface of the rotary table 11, which has a circular periphery.
Next, this will be explained.

In the disk drive state, when the side surface of the drive protrusion 13 is pressed by the hub 2b, the leaf spring 1
The protruding portion 15c of No. 5 is tilted with its left end as a fulcrum in FIG. The portion serving as this fulcrum is the edge 4 of the peripheral portion 15b of the leaf spring 15. The edge 4 of this leaf spring 15 contacts the edge 5 of the lower surface of the rotary table 11 at a point. As a result, the protruding portion 15c of the leaf spring 15
The fulcrum of tilt becomes unstable. Also, the protruding part 1
The fulcrum of 5c is the center of the spindle 12 and the drive protrusion 1
When the drive protrusion 13 drives the disk 2, the plate spring 1
5 is deformed as shown in FIG. 12, and the driving protrusion 13 is displaced from the non-driving position shown by the solid line in FIG. 11 to the driving position shown by the broken line. When the position of the drive protrusion 13 in the disk rotation direction changes, the relationship between the drive protrusion 13 and the index for detecting the predetermined angular position of the disk 2 also changes, making it possible to accurately know the predetermined angular position of the disk 2 from the index. become unable to do so.

As a method for reducing the inclination of the drive protrusion 13 described above, the applicant of the present invention has proposed a leaf spring 15 having the shape shown in FIG. This leaf spring 15 has a slit 27
, and has a folded portion 15d, so the first
This restricts the driving protrusion 13 from tilting in the direction shown by the broken line in FIG. However, even in this case, the fulcrum of the inclination of the protruding portion 15c of the leaf spring 15 is obtained by the contact between the circular periphery of the rotary table 11 and the circular periphery of the leaf spring 15, so that the fulcrum position becomes unstable. .

Note that it is possible to limit the inclination by reducing the margin between the drive protrusion 13 and the hole 11a of the turntable 11 into which the drive protrusion 13 is inserted, but the drive protrusion 13 must move up and down. First, since it is difficult to obtain this vertical movement without inclining or displacing the driving protrusion 13, the above-mentioned margin is necessary. If there is not enough room, drive protrusion 1
3 hits the hole 10a and cannot move up and down smoothly.

Therefore, an object of the present invention is to reduce the positional fluctuation of the drive protrusion (drive pin).

[Means for solving problems]

To solve the above problems and achieve the above objects, the present invention, which will be explained with reference to the reference numerals in the drawings showing the embodiments, is characterized in that a stepped portion 6 is provided on the lower surface of the rotary table 11. It is. This stepped portion 6 extends in a direction perpendicular to the direction in which a straight line connecting the center of the spindle 12 and the center of the drive protrusion 13 extends. Furthermore, the step portion 6 and the leaf spring 15 are associated with each other such that the leaf spring 15 contacts the edge 6a of the step portion 6.

[Effect]

According to the above invention, since the leaf spring 15 comes into contact with the edge 6a of the step portion 6 extending linearly, the inclination of the protruding portion 15c of the leaf spring 15 becomes stable, and the positional fluctuation of the driving protrusion 13 is reduced.

〔Example〕

Next, a floppy disk device according to the present invention will be explained with reference to FIGS. 1 to 7. However, the first
In FIGS. 8 to 7, parts common to those in FIGS. 8 to 13 are designated by the same reference numerals, and their explanations will be omitted. FIG. 1 shows the main parts of the disk device, in which a rotary table 11 is connected to an outer rotor type motor 16 by a spindle 12. As shown in FIG. 1
7 and 18 are a pair of magnetic heads, 19 is a carriage; magnetic heads 17 and 18 are a pair of magnetic heads 19;
The carriage 19 supported by the disk 2
The radially guiding rod 20 is supported by a fixing member 22 provided on the frame 21. The head moving mechanism 23 includes a stepping motor (not shown) and a lead screw (not shown), and moves the carriage 19 in the radial direction of the disk 2.

24 is a magnet as an index disposed at a predetermined angular position on the outer rotor of the motor 16, and 25 is a magnetoelectric detection element, ie, an index detection element, for detecting passage of this magnet 24. Since the drive protrusion 13 of the rotating table 11 has a fixed angular positional relationship with the magnet 24, the position of the drive protrusion 13, that is, the rotational angular position of the disk 2 can be known by detecting the position of the magnet 24.

As shown in FIG. 5, the leaf spring 15 has a portion 15a.
It consists of a circular arc-shaped peripheral portion 15b of about 60 to 90 degrees with this as a reference, and a protruding portion 15c extending from the tip of this peripheral portion 15b toward the center of the rotary table 11. The protruding portion 15c includes a folded portion 15d for mounting the driving protrusion 13. Note that one end portion 15a
A hole 26a through which the spindle 12 passes is provided, and a hole 26b for attaching the drive projection 13 is provided in the folded portion 15d. The folded portion 15d is formed by providing a slit 27 between this and the arcuate portion 15b,
It extends in a direction (circumferential direction) that intersects the radial direction of the disk. Further, a fixing hole 26c is provided at the end of the circumferential portion 15b, and the plate spring 15 is attached to the hole 26c.
A screw 26d inserted into the hole is fixed. Therefore, the peripheral portion 15b is supported in a cantilevered manner.

The driving protrusion 13 is a folded portion 15 of the leaf spring 15.
Fixed pin 13a implanted in d and this pin 13a
A roller 13b is rotatably mounted on the hub 2b, and the roller 13b is formed to be inserted into a hole 10b of the hub 2b. The roller 13b is made of oil-less metal, highly slippery synthetic resin, ball bearings, or the like.

As is clear from FIG. 2, the rotary table 11 is provided with a hole 11a for allowing the drive protrusion 13 to be displaced in the axial direction and in the radial direction. This hole 1
1a is formed larger than the drive protrusion 13 for smoothly displacing the drive protrusion 13. Therefore, the driving protrusion 13 has substantially no positioning action. The limiting member 28 is a roller 1 of the driving protrusion 13.
3b is placed on the edge of the hole 11a so as to be in contact with it at the final drive position, and is fixed to the rotary table 11. When the driving protrusion 13 is not engaged with the edge of the hole 10b of the disk 2, the roller 13b is slightly separated from the surface 28a of the limiting member 28, as shown by the solid line in FIG. Therefore, the driving protrusion 13 is connected to the limiting member 28
It can be freely displaced in the axial direction and radial direction together with the leaf spring 15 without being subject to any restrictions. However, when the drive protrusion 13 reaches the final position as shown by the broken line in FIG. 7, the drive protrusion 13 comes into contact with the surface 28a of the limiting member 28, so that further displacement in the counterclockwise direction is restricted. be done. Note that the restricting member 28 has a thickness that does not prevent the driving protrusion 13 from being inserted into the hole 10b.

A cutout step 6 according to the present invention is provided on the lower surface of the rotary table 11. As is clear from FIG. 6, the edge 6a of the stepped portion 6 extends in a direction perpendicular to the radial direction of the rotary table 11. This stepped portion 6 is a leaf spring 15
It is provided at a position opposite to the root portion 15e of the protruding portion 15c.

When the disk 2 is mounted on the rotary table 11 provided with the stepped portion 6 and the rotary table 11 is rotated, the drive protrusion 13 enters the hole 10b of the disk 2, and the drive protrusion 1
3 is pressed by the edge of the hole 10b, so the leaf spring 15
The protruding portion 15c is tilted as shown in FIG.
That is, the tip portion of the protruding portion 15c is lowered,
The base portion 15e becomes higher, contacts the edge 6a of the stepped portion 6 of the rotary table 11, and tilts using this as a fulcrum. Since the edge 6a extends in a straight line, the base portion 15e contacts the turntable 11 along a line, and the protruding portion 15c tilts stably, causing the drive protrusion 13 to move toward the limit member 28 as shown by the broken line in FIG. direction. In this embodiment, since the leaf spring 15 is provided with the slit 27 as shown in FIG. 5, the fulcrum of the inclination of the protruding portion 15c is on the left side in FIG. Therefore, although the displacement of the drive protrusion 13 in the direction shown by the broken line in FIG. 11 is restricted, this restriction can be achieved more reliably in this embodiment. As a result, variations in the positional relationship between the hole 10b of the disk 2 and the index magnet 24 are also reduced.

Next, another embodiment of the present invention is shown in FIGS. 15 to 17.
This will be explained with a diagram. In this embodiment, the turntable 11 consists of a metal bush 41, a plastic magnet 42, and a fluororesin ring 43. A plastic magnet 42 is integrally molded with the bush 41 and attracts the hub 2b of the disk 2. A step 6 according to the invention is provided on the plastic magnet 42. One end portion 15a of the leaf spring 15 is connected to the bushing 4.
1 and the peripheral portion 15
It is fixed to a plastic magnet 42 by two holes 45 provided in one end region of b. This fixation is achieved by inserting the protrusion 46 of the plastic magnet 42 into the hole 45 and caulking the head of the protrusion 46, as shown in FIG. Of course, the hole 45 may be fixed with a screw.

[Modified example]

The present invention is not limited to the above-described embodiments, but the following modifications are possible, for example.

(A) The driving protrusion 13 may be composed only of the pin 13a.

(B) Instead of using the magnet 24 as an index, an optical detection or electrical detection index may be used.

The leaf spring 15 may have the shape shown in FIG. 13 or 14.

[Effect of idea]

As is clear from the above, according to the present invention, the plate spring 15 can be stably deformed by the action of the stepped portion 6 of the rotary table 11, and the driving protrusion 1 during driving can be stably deformed.
The change in position 3 can be reduced.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing a disk drive device according to an embodiment of the present invention, Fig. 2 is an enlarged plan view showing the vicinity of the rotary table in Fig. 1, and Fig. 3 is a disk and a disk in a driven state. 2 is a cross-sectional view taken along the line 2 in FIG. 2 showing the relationship with the rotary table, FIG. 4 is a left side view showing the relationship between the rotary table in FIG. 3, the leaf spring, and the drive protrusion, and FIG. 5 is the plate in FIG. 6 is a bottom view showing a part of the turntable in FIG. 3; FIG. 7 is a plan view showing changes in the position of the drive protrusion; FIG. 8 is a part of a conventional disk device. 9 is a plan view of the disk cartridge, FIG. 10 is a bottom view of the disk cartridge of FIG. 9, and FIG.
12 is a left side view showing a part of FIG. 8; FIGS. 13 and 14 are plan views showing another leaf spring;
Fig. 15 is a sectional view of the rotating table part showing another embodiment of the present invention, Fig. 16 is a bottom view showing a part of the rotating table part of Fig. 15, and Fig. 17 is a fixed plate spring shown in Fig. 16. FIG. 1... Disk cartridge, 2... Disk, 2a... Magnetic sheet, 2b... Hub, 6...
Stepped portion, 10a...Spindle insertion hole, 10b...
Drive protrusion insertion hole, 11... Turntable, 12... Spindle, 13... Drive protrusion, 14... Magnet, 15
...Flat spring.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a hub 2b and a recording medium sheet 2a fixed to the hub 2b, a spindle insertion hole 10a is provided approximately in the center of the hub 2b, and the spindle insertion hole 10a and A driving protrusion insertion hole 10b is provided in the hub 2b with a certain positional relationship.
In order to rotationally drive the recording medium disk 2 provided with a disc-shaped rotating table 11, and a spindle 1 protruding from the center of the rotating table 11 so as to be inserted into the spindle insertion hole 10a.
2, a drive protrusion 13 inserted into the drive protrusion insertion hole 10b with a margin, and the drive protrusion 1
3 includes a plate spring 15 supporting the driving protrusion 13 so as to be displaced at least in its axial direction, and the plate spring 15 supports the rotating base 11.
a fixed portion fixed to the lower surface; a peripheral portion 15b supported in a cantilever by the fixed portion and extending along the peripheral edge of the rotary table 11; In a disk drive device having a structure in which the drive protrusion 13 is disposed on the protrusion part 15c, the lower surface of the rotary table 11 corresponds to the root part 15e of the protrusion part 15c. A cutout step 6 is provided in the
The edge 6a of the stepped portion 6 is extended linearly in a direction perpendicular to the direction in which the protruding portion 15c extends, and the drive protrusion 13 allows the disk 2 to
A disk drive device characterized in that the plate spring 15 is formed so as to be in contact with the edge 6a when the disk drive device is being driven. (2) The protruding portion 15c has a portion 15d defined by a slit 27 cut in the circumferential direction of the rotary table 11, and the drive protrusion 13 is provided in this portion 15d.
2. A disk drive device according to claim 1, wherein a disk drive device is provided with a utility model. (3) The drive protrusion 13 consists of a fixing pin 13a implanted in the leaf spring 15 and a roller 13b rotatably attached to the pin 13a.Claim 1 of the Utility Model Registration Claim. Or the disk drive device according to item 2.