JPH01307049A - Disk driving device - Google Patents

Abstract

PURPOSE:To improve a receiving disk in its magnetic attracting balance and to securely set a disk on the receiving disk by providing equally such a number of nonmagnetized parts more than a prescribed number including a through hole part for inserting a driving pin as a divisor of a number of magnetized poles to the receiving disk. CONSTITUTION:A floppy disk 24 is placed on a receiving surface 17a in the receiving disk 16, and when the receiving disk 16 under this state is rotated by rotating a rotational shaft 13a of a brushless motor 15, a sliding plate 17 is slid to the floppy disk 24. Then, the floppy disk 24 is slightly moved without being strongly attracted to fix an upper surface 16a before a fitting hole 25a of the disk 24 coincides with the rotational shaft 13a in its position, and when the driving pin 23 reaches the position to coincide with the engaging hole 25b of the floppy disk 24, they are engaged together, and the floppy disk 24 is set on the receiving disk 16. Now, since hole parts 20 and 21 are regarded as the nonmagnetized parts, the receiving disk 16 is formed with nonmagnetized parts to the number of >=3 as the divisor for the number of magnetized poles including the through hole 19 without using a particular magnetizing device for forming nonmagnetized parts.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a disk drive device that improves the magnetic attraction balance of a receiving plate on which a disk is placed.

(Prior art) Conventionally, for example, as a floppy disk drive device, the third
As shown in the figure, a magnetic receiving plate 1 is attached to the rotating shaft 2 of the motor, and the magnetic force of the receiving plate 1 attracts the center part of the floppy disk 3, and the floppy disk 3 is transferred to the receiving surface 1a of the receiving plate 1. While holding it in close contact with the receiving plate 1,
The drive pin 4 provided in the floppy disk 3 is inserted into the engagement hole 3 of the floppy disk 3
a1: A configuration is provided in which the floppy disk is driven by engagement. In this case, the drive pin 4 is
The spring member 5 is fixed to one end of a spring member 5 attached to the receiving plate 1, and is held in a state where it is inserted into an insertion hole 6 provided in the receiving plate 1.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional configuration, since there is no magnetic attraction force in the insertion hole 6 of the receiver 1, the magnetic attraction balance of the receiver 1 as a whole is disrupted, which causes the floppy When sucking the disk 3, for example, as shown by the two-dot chain line in FIG. There was a problem in that the device could be attracted to the part with a large suction force on the opposite side of 6 and be set in an inclined position.

The present invention has been made in view of the above circumstances, and is a disk drive device that can improve the magnetic attraction balance of the receiver and reliably set and attract the disk even if the receiver has an insertion hole for the drive pin. is to provide.

[Structure of the Invention] (Means for Solving the Problems) A disk drive device of the present invention has a magnetic receiving plate on a rotating shaft having an insertion hole and on which a disk is placed, and a spring member is attached to the receiving plate. a drive pin for transmitting rotational force to the disk by being inserted into the insertion hole is provided in the spring member, and the number of magnetized poles of the receiving plate including the insertion hole portion is provided in the receiving plate. It is characterized by a structure in which a number of non-magnetized parts, which is a divisor of 3 or more, are equally distributed.

Preferably, the celadon-free portion is constructed by forming a hole similar to the insertion hole in the receiving plate.

(Function) According to the disk drive device of the present invention, since the non-magnetized portions including the insertion hole portion are formed in the receiving plate at equal intervals,
The magnetic attraction balance of the receiving plate is improved, and the disk can be set and attracted securely.

If a hole similar to the insertion hole is provided in the receiving plate, the hole will be formed as a non-magnetized part when the receiving plate is magnetized, and the receiving plate will have a good structural weight balance. It is.

(Embodiment) An embodiment in which the present invention is applied to a floppy disk drive will be described below with reference to FIGS. 1 and 2.

Reference numeral 11 denotes a base having a cylindrical shaft portion 11a in the center, and a stator 12 having an excitation coil 12a is attached to the lower surface of the base. 13 is a rotor, which has a rotating shaft 13a erected in the center and a rotor magnet 13b corresponding to the excitation coil 12a. And rotor 1
The rotating shaft 13a of No. 3 has a bearing 14 on the shaft cylinder portion 11a of the base 11.
．． The motor 1 is rotatably supported via the motor 14, and as a result of the above, the motor 1
5 are configured. Reference numeral 16 denotes a circular receiving plate made of, for example, a plastic magnet, and its central portion is attached to the upper end of the rotating shaft 13a. 20 Receiver 16
A sliding plate 17 made of a non-magnetic material is buried therein, and its upper surface, ie, a receiving surface 17a, protrudes slightly above the upper surface 16a of the receiving plate 16. Then, the upper surface 1'6a of the receiving plate 16
As shown in FIG.
8a to 18f are magnetized so that north poles and south poles are alternately arranged along the circumferential direction. Furthermore, a circular insertion hole 19 is formed on the outer circumferential side of the receiving plate 16 at the boundary between the magnetic poles 18a and 18b.
Circular holes 20 and 21 similar to the insertion hole 19, which is a non-magnetized portion, are formed at the boundary between the magnetic poles 18e and 18f, and the receiving plate 16 has approximately the same number of magnetized poles. Three celadon-free parts, the number of which is three or more, are equally spaced. Reference numeral 22 denotes a spring member made of a leaf spring attached to the lower surface of the receiving plate 16, and a drive pin 23 is fixed to the tip of the spring member 22 so as to be inserted into the insertion hole 19. The drive pin 23 is set such that its upper portion protrudes upward from the receiving surface 17a of the sliding plate 17.

Note that 24 is, for example, a 3.5-inch type floppy disk, and has a hub 25 made of a magnetic material in the center. The hub 25 is formed with a fitting hole 2.5a into which the rotation shaft 13a is fitted and an engagement hole 25b into which the drive pin 23 is fitted.

Now, in the case of the configuration as described above, when the floppy disk 24 is placed on the receiving surface 17a of the receiving plate 16 and the receiving plate 16 is rotated by the rotating shaft 13a of the brushless motor 15 in this state, the sliding The moving plate 17 slides on the floppy disk 24, and the floppy disk 24 moves slightly without being strongly suctioned and fixed to the upper surface 16a until its fitting hole 25a matches the position of the rotating shaft 13g, and the drive pin When the floppy disk 23 reaches a position matching the engagement hole 25b of the floppy disk 24, it is engaged with it as shown in FIG. 2, and the floppy disk 24 is set on the receiving plate 16. As a result, the rotational force of the receiving plate 16 is transmitted to the floppy disk 24, and the floppy disk 24 is driven to rotate. Further, in this state, the plastic magnetic receiving plate 16 attracts the hub 25 of the floppy disk 24, so that the floppy disk 24 is stably held on the receiving plate 16.

According to this embodiment, the following effects can be obtained. That is, the insertion hole 19 through which the drive pin 23 is inserted.
Holes 20 and 21 similar to the above are formed at equal intervals on the receiving plate 16, and the non-magnetized portions of the upper surface 16a of the receiving plate 16 are evenly distributed, so that the upper surface 16a of the receiving plate 16 is free from magnetic attraction. The balance is improved, and there is no possibility of the floppy disk 24 being suctioned and fixed in an inclined state, and the floppy disk 24 is suctioned and fixed after being set securely. Even in this case, the non-magnetized portion is the hole 20.2.
1, the receiving plate 16 can be easily manufactured without using a special magnetizing device to form a non-magnetized portion, and positioning when magnetizing can be done using the insertion hole 19. This can be easily done using the holes 20, 21. In addition, the receiving plate 16 has a good weight balance with respect to rotation by providing the hole portion 20.21 together with the insertion hole 19. Moreover, since it has such a structure, there is a good swirl flow during molding, and the assembly is not complicated. There is nothing you can do.

In addition, in the above embodiment, the insertion hole 19 of the receiving plate 16 and the hole 2
0.21 magnetic poles 18a to 18f, but the present invention is not limited to this.
Any configuration may be used as long as it is provided equidistantly, such as in a portion corresponding to the central portion of each of the sections 18f to 18f.

Further, although the holes 20 and 21 are formed in the receiving plate 16 as non-magnetized parts, instead, for example, four parts may be formed, and furthermore, they may be formed as literally non-magnetized parts. You may do so.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be applied with appropriate modifications within the scope of the gist, for example, the number of magnetized poles of the receiving plate may be set appropriately. It is possible.

[Effects of the Invention] As explained above, according to the present invention, the following effects can be obtained.

According to the disk drive device according to claim 1, the receiving plate on which the disk is placed has three or more non-magnetized portions, which is a divisor of the number of magnetized poles, including the insertion hole portion for the drive pin insertion. Since they are arranged evenly, the balance of magnetic attraction of the receiver is good, and as a result, the disk is reliably set on the receiver, which is an excellent effect.

According to the disk drive device according to the second aspect, since the non-magnetized portion is formed by forming a hole similar to the insertion hole in the receiving plate, a special magnetizing device for forming the non-magnetized portion is required. It can be easily formed without using a mold, the assembly for molding is not complicated, and furthermore, such a structure has excellent effects in that the weight balance with respect to rotation is also good.

[Brief explanation of the drawing]

FIG. 1 is a top view of a receiving plate showing an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the overall configuration, and FIG. 3 is a vertical cross-sectional view of a receiving plate portion showing a conventional example. In the drawing, 12 is a stator, 13 is a rotor, 13a is a rotating shaft, 15 is an akinal gap type brushless motor,
16 is a receiving plate, 19 is an insertion hole, 20 and 21 are hole portions (non-magnetized portions), 22 is a spring member, 23 is a drive pin, and 24 is a floppy disk (disk). Applicant: Toshiba Corporation

Claims (1)

[Scope of Claims] 1. A magnetic receiving plate having an insertion hole and attached to a rotating shaft on which a disk is placed, a spring member attached to the receiving plate, and a receiving plate having the insertion hole in the spring member. and a drive pin for transmitting rotational force to the disk, the receiving plate including the insertion hole portion having a divisor of 3 or more of the number of magnetized poles of the receiving plate. A disk drive device characterized in that a number of non-magnetized portions are equally distributed. 2. The disk drive device according to claim 1, wherein the non-magnetized portion is formed by providing a hole similar to an insertion hole in the receiving plate.