JP2519582Y2 - 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 is slightly displaceable in the direction, and also displaceable in the axial direction. The displacement of the drive pin has a meaning for keeping the positional relationship between the disc and the rotating mechanism in a desired state.

As another drive pin support mechanism, a drive pin is attached to the tip of a rotatable lever, and a mechanism that gives a biasing force to the lever from the center of the disk toward the outer periphery by a spring is disclosed in Japanese Utility Model Publication No. 62-106347. It is disclosed.

FIG. 9 shows a conventional device in which the drive pin 25 is supported by the lever 24a. The spindle 23 is inserted into the spindle insertion hole 10a of the hub 2b, the drive pin 25 is inserted into the drive pin insertion hole 10b, and the lever 24a is perpendicular to the straight line connecting the spindle 23 and the drive pin 25. A fulcrum 28a of the lever 24a is provided near a virtual straight line passing through the spindle 23.

[Problems to be solved by the invention] By the way, since the floppy disk 2 is manufactured by a plurality of manufacturing companies, the drive pin insertion hole 10 in the hub 2b is
There is variation in the position of b. If the drive pin insertion hole 10b changes from the position shown by the solid line to the position shown by the dotted line in FIG. D occurs. As a result, a difference (index timing error) corresponding to the error D also occurs between the index (index) provided on the disk rotation device and indicating the reference angular position and the angular position on the track of the disk. There is a possibility that it will be impossible to record or reproduce the disk having the hole 10a in the first and the disk having the hole 10a at the position shown by the dotted line under the same conditions.

Further, in the conventional device shown in FIG. 9, the position of the drive pin 25 also changes when the drive pin insertion hole 10b is displaced to the right of the position shown by the solid line in FIG. In FIG. 9, the direction of the displacement of the drive pin 25 in the circumferential direction of the hub 2b is opposite when the drive pin insertion hole 10b is displaced leftward as shown by the dotted line and when it is displaced rightward. And the difference between the position of the drive pin 25 when the drive pin insertion hole 10b is displaced to the left and the position of the drive pin 25 when displaced to the right is when the displacement is only to the left or to the right. It doubles. In short, in the conventional device in which the lever 24a shown in FIG. 9 is obliquely arranged, the change range of the position of the drive pin 25 due to the change of the position of the drive pin insertion hole 10b becomes large. The positional deviation of the drive pin 25 in the circumferential direction of the hub 2b of the drive pin insertion hole 10b shown by the solid line in FIG. 9 causes an index timing error.

Therefore, an object of the present invention is to provide a disk device capable of reducing the range of variation of the position of the drive pin 25 due to the variation in the position of the drive pin insertion hole.

[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 that includes a support 24 that supports 25 and is rotatably supported by the rotary table 11, with respect to a straight line passing through the center of the spindle 23 and the center of the drive pin 25. The present invention relates to a disk device, wherein a rotation center of the support body 24 is set on or near an imaginary straight line which is orthogonal and passes through the center of the drive pin 25.

Incidentally, it is desirable to provide a means for biasing the support 24 in the outer peripheral direction of the disk 2.

[Operation and Effect of the Invention] In the present invention, the fulcrum of the support 24 is located on a virtual line that is orthogonal to the straight line passing through both the spindle 23 and the drive pin 25 and passes through the center of the drive pin 25. Since the drive pin insertion hole 10b is displaced from the standard position to the center side of the hub 2b and the outer peripheral side of the hub 2b, the drive pin 25 in the circumferential direction of the hub 2b is disposed. The direction of positional deviation of is the same. Therefore, the range of displacement of the drive pin 25 in the circumferential direction due to the variation in the position of the drive pin insertion hole 10b becomes smaller than that of the conventional device shown in FIG.
The change range of the index timing is also small.

[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 composed of an attraction table 21 made of a plastic magnet for attracting the hub 2b and an iron plate which is a magnetic body fixed to the attraction table 21. The ring-shaped yoke 22 has a plane shape. 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 lever 24 made of a magnetic metal and made of a metal plate which is slightly elastically deformable is rotatably supported by a shaft 28. The shaft 28 is fixed to the yoke 22, and the lever 24 extends along a straight line connecting the shaft 28 and the drive pin 25. A shaft 28 or a fulcrum supporting the lever 24 is arranged on an imaginary straight line that is orthogonal to a straight line passing through the center of the spindle 23 and the center of the drive pin 25 and that passes through the center of the drive pin 25.

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. Since the lever 24 is arranged so as to extend along the inner peripheral edge of the magnet 29, it is attracted by the magnet 29 in the direction indicated by the arrow 30 in FIG. 5 and is biased in this direction.

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, it is pressed downward by the hub 2b. At this time, the supporting end of the drive pin 25 of the lever 24 is slightly displaced in the direction in which the shaft 25a of the drive pin 25 extends due to elastic deformation.
After that, the motor is driven and the turntable 11 rotates, and the hole 10b
The drive pin 25 is inserted into.

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
Since 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 lever 24 rotates in the clockwise direction against this bias when the disc is mounted. Move. Therefore, in FIG. 8, a biasing force is applied to the drive pin 25 in the direction of pressing the drive pin 25 to the point D1, and the accurate positioning of the drive pin 25 with respect to the hole 10b is achieved.

The position of the drive pin 25 during driving is substantially constant regardless of the variation in the position of the drive pin insertion hole 10b. Therefore, the index timing error can be suppressed.

Since the biasing force of the lever 24 is given by the magnet 29 of the motor, a special member for obtaining the biasing force is unnecessary,
A low cost is achieved, and a special space for biasing is not required, so that a low profile is achieved.

[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) A magnetic material such as an iron piece is arranged only on the surface of the lever 24 facing the magnet 29, and the lever 24 can be configured by a combination of a non-magnetic material and a magnetic material. Also, the shaft 25 of the drive pin 25
By disposing a magnetic washer in the lower part of a and attracting this with a magnet 29, a biasing force in the direction of arrow 30 in FIG. 5 and a biasing force in the protruding direction (upward direction) of the drive pin 25 are obtained. Good.

(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 using the magnet 29 of the motor, a dedicated magnet for giving a biasing force to the lever 24 can be arranged. A biasing force in the counterclockwise direction in FIG. 2 can be applied to the lever 24 by a spring.

[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 disc cartridge, FIG. 7 is a bottom view of the disc cartridge of FIG. 6, FIG. 8 is an enlarged plan view showing the relationship between the hub and the drive pin, and FIG. 9 is a conventional plan view. It is a top view which shows the relationship between a drive pin support mechanism and a hub. 11 …… Disk turntable, 12 …… Winding, 21 …… Suction stand, 22
...... Yoke, 23 ...... Spindle, 24 ...... Lever, 25 ......
Drive pin, 28 …… axis, 29 …… magnet.

Claims (2)

(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). Pin (25) and the drive pin (25)
And a support body (24) rotatably supported by the rotary table (11), the center of the spindle (23) and the center of the drive pin (25). The rotation center of the support (24) is set on or near an imaginary straight line that is orthogonal to a straight line passing through and passes through the center of the drive pin (25). Disk device. 2. A support body (24) at least a portion near the drive pin connection is formed of a magnetic material, and a biasing force in a direction from the center of the disk (2) to the outer periphery is applied to the drive pin connection vicinity portion. 2. The disk device according to claim 1, wherein a magnet (29) for giving is arranged.