JP2519581Y2 - Disk unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a disk device for recording or reproducing a signal using a micro-floppy disk or a disk cartridge similar thereto, and more specifically, The present invention relates to a drive pin support mechanism.

[Prior Art] Diameter 86mm called Micro Floppy Disk
A (about 3.5 inch) magnetic disk and an apparatus for recording or reproducing data using the magnetic disk are known. As shown in FIGS. 6 and 7, the floppy disk or magnetic disk cartridge 1 is constructed by housing a recording medium disk 2 in a synthetic resin case 3 having rigidity. The case 3 has head insertion openings 6 and 7 on both the front surface 4 and the back surface 5, and the openings 6 and 7 when not in use.
The slide shutter 7 is closed.
The shutter 8 is biased to the right in FIG. 6 by a spring (not shown), and when used, the shutter 8 is moved to the left against this biasing force. This Disc Cartridge 1
The disk 2 comprises a magnetic sheet 2a and a hub 2b made of a metal disk mounted in the center thereof. Since the disk 2 is not rotated by pressing with a clamper, an opening 9 for exposing the hub 2b is provided only on the back surface 5 of the case 3, and the hub 2b is exposed from here. The hub 2b is provided with a spindle insertion hole 10a and a drive pin insertion hole 10b.

The drive pin to be inserted into the drive pin insertion hole 10a is attached to the tip of a cantilever-supported leaf spring and is directed toward the center of the disc, as disclosed in Japanese Utility Model Laid-Open No. 62-168152. It can be slightly displaced in the direction (disk radial direction) and can be displaced in the axial direction.
The radial displacement of the drive pin has a meaning for keeping the positional relationship between the disk and this rotating mechanism in a desired state, and the axial displacement of the drive pin is the insertion of the drive pin into the drive pin insertion hole 10a of the hub 2b. To enable.

As another support mechanism for the drive pin, a mechanism in which a drive pin is attached to the tip of a rotatable lever and a biasing force in the radial direction of the disk and in the axial direction of the drive pin is applied to the lever by a spring is used. It is disclosed in the official gazette.

[Problems to be solved by the invention] By the way, the former has a problem that it is difficult to surely obtain a desired amount of displacement of a drive pin by a leaf spring, and the latter has a problem of giving an appropriate biasing force to a lever. It is difficult to attach the spring to the disk, and it is difficult to arrange the spring only on the same plane as the lever, and it is inevitably arranged so as to overlap the lever, which makes it difficult to reduce the thickness of the disk device. In addition, the cost of using the spring is high, and the spring may be disengaged from the lever and the required biasing force may not be obtained.

Therefore, an object of the present invention is to provide a disk device capable of reducing cost and improving reliability.

[Means for Solving the Problems] The present invention for achieving the above object will be described with reference to the reference numerals of the drawings showing an embodiment. The hub 2b and the recording medium sheet 2a fixed to the hub 2b will be described below. Consists and said hub 2b
A spindle insertion hole 10a is provided substantially in the center of the hub 2 and has a fixed positional relationship with the spindle insertion hole 10a.
In order to rotationally drive the recording medium disc 2 in which the drive pin insertion hole 10a is provided in b, the rotary table 11 and the spindle 23 protruding from the center of the rotary table 11 to be inserted into the spindle insertion hole 10a. And the drive pin insertion hole 10b
Drive pin 25 that is inserted with a margin in the
In a disk device comprising a support body supporting the drive pin 25 so that the drive pin 25 can be displaced at least in the axial direction, at least a portion of the support body 24 near the coupling of the drive pin 25 is made of a magnetic material. A magnetic member 24a is formed or is coupled to the lower portion of the drive pin 25, and a rotor of a motor having a magnet 29 is integrally formed on the rotary table 11 and faces the magnet 29 of the rotor. The stator windings are arranged in such a manner that the attraction force of the magnet 29 allows the axial biasing force for inserting the drive pin 25 into the drive pin insertion hole 10b to be obtained in the vicinity of the coupling or The present invention relates to a disk device characterized in that the magnetic member 24a and the magnet 29 are associated with each other.

[Operation and Effect of the Invention] In the present invention, the magnet 29 of the rotor of the motor imparts an axial biasing force to the drive pin 25. Therefore,
The axial biasing force of the drive pin 25 can be easily obtained,
The cost can be reduced.

[Embodiment] Next, a floppy disk device according to an embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the main part of the floppy disk device is provided with a rotary base 11 composed of a combination of a disk suction base and a motor rotor, a stator winding 12 of the motor, a winding 12 and the like. It has a disk drive portion including a circuit board 13.

The signal converting magnetic heads 14 and 15 contacting the disk 2 are attached to a carriage 16 and a head supporting arm 17. The arm 17 is rotatably supported by the carriage 16 by a leaf spring 18, and is biased clockwise by a spring 19. When the cartridge 1 is mounted on the disk drive portion, the arm 17 is forcibly rotated counterclockwise so that a space is created between the pair of magnetic heads 14 and 15.
The heads 14 and 15 are moved by the moving mechanism 20 in the radial direction of the disk 2.

As is apparent from FIGS. 2 and 3, the disk rotary table 11 is a flat ring formed of a magnetic attraction table 21 made of a plastic magnet for attracting the hub 2b and a magnetic material fixed to the magnetic attraction table 21. And a yoke 22.
The rotary table 11 has a spindle 23 that is planted in the center of the suction table 21 and a drive pin 25 that is supported by a lever 24 that is arranged on the back surface side of the yoke 22. Supported by.

The yoke 22 is formed with a hole 27 for projecting the drive pin 25. As is apparent from FIG. 2, the hole 27 has a margin with respect to the drive pin 25 so that the drive pin 25 can be displaced in the spindle 23 direction (disk radial direction). The drive pin 25 comprises a shaft 25a and a roller 25b as shown in FIG. 4, and the shaft 25a is a lever 24 which functions as a drive pin support.
The roller 25b is rotatably supported by the shaft 25a. A washer (washer) 24a made of a magnetic material is coupled to the lower portion of the shaft 25a of the drive pin 25 as a magnetic member for attraction. Lever made of slightly elastically deformable metal plate
24 is rotatably supported by a shaft 28. Further, the lever 24 has a shaft so that it can be slightly displaced in the axial direction of the drive pin 25.
Backed by 28. The shaft 28 is fixed to the yoke 22, and the lever 24 extends in an arc shape along the circumferential direction of the yoke 22.

A magnet 29 as a rotor of the motor is fixed to the back surface of the yoke 22. The magnet 29 is formed in an annular shape as shown in FIG. 5, is divided into 20 equal parts in the circumferential direction, and is magnetized to the N pole and the S pole.

The magnetic washer 24a, which is arranged on the lower surface side of the tip of the lever 24, is arranged inside the magnet 29 of the motor rotor, and as is apparent from FIG. Is arranged on the lower side in the extending direction), the upper right suction force as indicated by the arrow in FIG. 3 is received. The attraction force of the washer 24a by the magnet 29 has a biasing force component in the axial direction (upward direction) of the drive pin 25 and a biasing force component in the radial direction (outer peripheral direction) of the disk 2.

The motor is a well-known flat type motor of the three-phase 18-pole axial gap type, and 18 windings 12 are arranged to face a magnet 29. Although not shown, three Hall elements necessary for controlling the motor are arranged facing the magnet 29, and a winding for detecting the rotation speed of the motor is further provided on the circuit board 13.
It is provided above.

[Operation] When recording or reproducing, the hub 2b of the disk 2 is placed on the rotary table 11, the spindle 23 is inserted into the spindle insertion hole 10a of the hub 2b, and the drive pin 25 is inserted into the drive pin insertion hole. Insert in 10b. When the drive pin 25 does not engage with the hole 10b, the hub 2b pushes the lever downward,
24 and the drive pin 25 are displaced downward against the upward biasing force of the magnet 29 of the motor. Motor is driven, turntable
When 11 rotates and the positions of the drive pin 25 and the drive pin insertion hole 10b coincide with each other, the pressing of the drive pin 25 by the hub 2b is released, and the drive pin 25 is provided based on the magnet 29 of the motor and the washer 24a. The driving pin insertion hole 10b is inserted by the upward biasing force.

The drive pin 25 is at the position indicated by the chain line in FIG. 8 immediately after it is inserted into the hole 10b of the hub 2b. The outer peripheral edge 31 of the hole 10b is not formed in an arc shape, becomes shorter as the distance from the spindle 23 advances in the clockwise direction, and becomes the minimum at point D1.

Therefore, when the drive pin 25 is displaced clockwise in FIG. 8, it comes into contact with the edge 31 and the edge 31 causes the drive pin 25 to move to the hub 2b.
Is pressed toward the center. Then, when the drive pin 25 comes into contact with the point D1, it is pressed most strongly in the center direction of the hub 2b. At this time, the drive pin 25 also contacts the point D2 and transmits the rotation to the hub 2b.

The displacement of the drive pin 25 toward the center of the disk is achieved by the rotation of the lever 24 about the shaft 28. Drive pin 25
The lever 24 for supporting the motor is biased in the counterclockwise direction in FIGS. 2 and 5 by the magnet 29 of the rotor of the motor, the magnetic washer 24a and the attraction action, so that it is resisted against this bias when the disc is mounted. The lever 24 rotates clockwise. Therefore, in FIG. 8, a biasing force for pressing the drive pin 25 to the point D1 is applied to the drive pin 25,
Accurate positioning of 25 with respect to hole 10b is achieved.

Since the biasing force having the two directional components of the drive pin 25 is given by the magnet 29 of the motor, a special member for obtaining the biasing force is not required, cost reduction is achieved, and a special biasing force is required. Since no space is required, thinning is achieved. Also, since no spring is used, it is highly reliable.

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

(1) The drive pin 25 can be composed of only the shaft 25a.

(2) The part or the whole of the lever 24 near the drive pin coupling is made of a magnetic material, and this magnetic material part is arranged below the magnet 29, and the attraction force of the magnet 29 against this creates a biasing force in two directions. You may get it.

(3) Although the drive pin 25 is arranged in the hole 27 of the yoke 22, the diameter of the suction table 21 is increased so that the drive pin 25 is attached to the suction table 21.
You may form the hole for making 25 project.

(4) The attraction table 21 can be configured not with a plastic magnet but with an ordinary magnet or a combination with a magnet support table. At this time, the support base can be an extension of the yoke 22.

(5) Instead of the lever 24, a support body that is slidable in the radial direction of the disk 2 is provided, and the drive pin 25 is supported by this support body, and the support body is a magnetic body or a magnetic member is integrated. By attracting this with the magnet 29, a biasing force in the axial direction of the drive pin 25 and the radial direction of the disk 2 can be magnetically applied to the drive pin 25.

[Brief description of drawings]

FIG. 1 is a front view showing a main part of a floppy disk device according to an embodiment of the present invention, FIG. 2 is an enlarged plan view showing a rotary drive portion of FIG. 1, and FIG. Fig. 4 is a right side view showing the drive pin and its supporting mechanism of Fig. 2, and Fig. 5 shows the relationship between the magnet of the motor of Fig. 2 and the drive pin and its supporting mechanism. 6 is a plan view of the disk cartridge, FIG. 7 is a bottom view of the disk cartridge of FIG. 6, and FIG. 8 is an enlarged plan view showing the relationship between the hub and the drive pin. 11 …… Disk turntable, 12 …… Winding, 21 …… Suction stand, 22
...... Yoke, 23 ...... spindle, 24 ...... lever, 24a ...
… Magnetic washer, 25 …… Drive pin, 29 …… Magnet.

Claims (1)

(57) [Scope of utility model registration request] 1. A spindle (2a) comprising a hub (2b) and a recording medium sheet (2a) fixed to the hub (2b), and a spindle insertion hole (10a) provided at substantially the center of the hub (2b) and the spindle. A rotary table (11) for rotationally driving a recording medium disk (2) having a drive pin insertion hole (10a) in the hub (2b) in a fixed positional relationship with the insertion hole (10a). A spindle (23) protruding from the center of the rotary table (11) so as to be inserted into the spindle insertion hole (10a), and a drive inserted with a margin in the drive pin insertion hole (10b). The pin (25) and the drive pin (2) so that the drive pin can be displaced at least in the axial direction thereof.
5) A disk device comprising a support body (24) supporting the drive member, wherein at least a portion of the support body (24) near the coupling of the drive pin (25) is formed of a magnetic material or the drive A magnetic member (24a) is coupled to a lower portion of the pin (25), a rotor of a motor having a magnet (29) is integrally formed on the rotary base (11), and the magnet (29) of the rotor is formed. The stator winding is disposed so as to face the magnet, and the axial biasing force for inserting the drive pin (25) into the drive pin insertion hole (10b) is obtained by the attractive force of the magnet (29). As described above, the disk device, wherein the coupling vicinity portion or the magnetic member (24a) and the magnet (29) are associated with each other.