JP2900352B2 - Magnetizing method of motor for driving information recording disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of magnetizing an FG magnetic pole of a motor for driving an information recording disk such as a magnetic or magneto-optical disk.

[0002]

2. Description of the Related Art An index magnetic pole is provided in a part of a multi-pole FG magnetic pole provided on a rotor of a motor for driving an information recording disk, and the index magnetic pole is used as a reference indicating a rotational position of the motor. Therefore, it was necessary to accurately position the index magnetic pole.

FIG. 10 is a plan view when a rotor is attached to a conventional box (hereinafter, referred to as a magnetized yoke), and FIG. 11 is a longitudinal sectional view of the same. The conventional FG magnetic pole has been performed using, for example, a magnetized yoke as shown in FIG. That is, the magnetized yoke is a so-called "jig" for magnetizing.

The magnetized yoke 100 is a cylindrical box having an open upper surface, and includes a center pin 101 fitted in a center hole 111 of a rotor 110 and a positioning pin 102 fitted in a positioning hole 112 of the rotor 110. The magnetized yoke 100 respectively
And the rotor 110 is supported substantially horizontally by an edge 100b of the side wall of the box 100. Further, the positioning hole 112 of the rotor 110 is provided at a position where the driving pin mounting hole 113 is rotated by 180 degrees around the center pin 101 as an axis.

[0005] As described above, the rotor 110 is connected to the magnetized yoke 10.
In the state of being mounted at 0, index magnetization was performed at a position K which is turned counterclockwise by a predetermined angle C from the drive pin mounting hole 113. The precision required for the magnetization is the angle C when the drive pin 114 attached to the drive pin attachment hole 113 contacts the side wall 110a of the rotor 110 facing the attachment hole 113 or a cut-and-raised portion 110b described later. .

[0006]

However, while the index magnetizing accuracy (angle C) is required to be C ± 0.1 degrees, the conventional magnetizing yoke has an F dimension (the diameter of the drive pin 114 is cut off). Accuracy, E dimension (positioning hole 112)
And the positioning pin 102).
The angle deviation D of the positioning hole 112 and the like are added, and it is difficult to increase the accuracy. For this reason, it has been necessary to provide a circuit for delaying the index signal after the motor is completed, to perform fine adjustment electrically, or to finely adjust the rotor 110 mechanically.

It is an object of the present invention to provide an information recording disk drive motor which can be magnetized accurately without being influenced by the F-dimension accuracy, the E-dimension variation, the angular deviation D of the positioning hole 112, and the like. It is to provide a magnetic method.

[0008]

In order to solve the above-mentioned problems, the present invention, according to claim 1, has a center pin which fits into a center hole of a rotor, a drive pin mounting hole of the rotor and a certain play. The center pin is fitted in the center hole of the rotor, the positioning pin is fitted in the drive pin mounting hole of the rotor with a certain play, and the center pin is The invention is characterized in that the rotor is rotated as an axis and the positioning pin is magnetized with reference to the position where the positioning pin abuts on the side wall of the rotor facing the drive pin mounting hole.

According to a second aspect of the present invention, there is provided a box having a concave portion which fits with a rotating shaft fixed to a center hole of a rotor, and a positioning pin which fits with a drive pin mounting hole of the rotor with a certain play. The rotating shaft is fitted into the recess of the box body, the positioning pin is fitted with a certain play in the driving pin mounting hole of the rotor, and the rotor is rotated around the rotating shaft. I do.

According to a third aspect of the present invention, a cut-and-raised portion is provided on a side wall of the rotor facing the drive pin mounting hole, and the positioning pin is magnetized based on a position in contact with the cut-and-raised portion. I do.

[0011]

Instead of using the positioning hole of the rotor as a reference, the side wall of the rotor facing the drive pin mounting hole or the cut-and-raised portion provided on the side wall of the rotor abuts the positioning pin provided on the magnetized yoke side. Since the magnetization is performed based on the set position, variations in the diameter of the drive pin, variations in the clearance between the positioning holes and the positioning pins, and variations in the accuracy due to the angular deviation of the positioning holes can be reduced. Therefore, there is almost no need to finely adjust the motor after completion of the motor.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. First, the main part of the information recording disk drive motor will be described. FIG.
Is a longitudinal sectional view of an example of an information recording disk drive motor, and FIG. 6 is a plan view of the same. The information disk drive motor 1 is
An iron substrate 2, a disk-shaped rotor 110 fixed to the rotating shaft 3 supported on the substrate 2, and a driving pin 114 attached to a driving hole 113 provided at a position deviated from the rotating shaft 3. And an annular permanent magnet 4 on the lower surface side of the rotor 110, and a coil 5 provided on the substrate 2 so as to face the permanent magnet 4.

Then, the rotary shaft 3 is fitted into the center hole 13 of the hub 12 of the magnetic disk 11 housed in the cartridge 10, and the drive shaft 14 is formed at a position deviated from the center hole 13 of the hub 12. The magnetic disk 11 is configured to rotate by fitting the drive pin 114.

A multi-pole FG is provided on the outer periphery of the rotor 110.
A magnetic pole (not shown) is magnetized, an FG signal of a timing corresponding to the FG magnetic pole is generated by an FG (frequency generator) 121 via a Hall element 120, and an index signal generating means 122 specifies the rotor 110. An index signal is generated at the timing of the rotation angle position.

FIG. 7 is a plan view of the rotor, and FIG. 8 is a vertical sectional view of the vicinity of the drive pin taken along line MM. The driving pin 114 is the rotating shaft 3
It is attached to a drive pin attachment hole 113 provided at a position deviated from. That is, the other end 115b of the support plate 115 having one end 115a attached to the lower surface of the rotor 110.
Is folded twice to protrude into the drive pin mounting hole 113, and the drive pin 114 is mounted on the other end 115b. Further, a sliding mechanism (not shown) is provided between the support plate 115 and the drive pin 114 so that the drive pin 114 has a play of about 0.1 mm to 0.2 mm in the rotation direction of the rotor 110 (the vertical direction in FIG. 7). A cut-and-raised portion 110 b is provided on a side wall 110 a of the rotor 110 facing the drive pin mounting hole 113 as a stopper of the drive pin 114. The reason why the play is provided in the drive pin 114 is that there is a variation in the F dimension of the cut-and-raised portion 110b.

FIG. 9 is a schematic plan view of the disk hub.
The center hole 13 and the drive hole 14 are provided in a disk hub 12 constituting the center of the magnetic disk 11 housed in the cartridge 10. And this center hole 13
The drive shaft 114 of the rotor 110 fits into the drive shaft 14 and the drive shaft 114 fits into the drive hole 14, respectively. Then, the position where the hub 12 rotates in the G direction (counterclockwise) and the drive pin 114 contacts the cut-and-raised portion 110b for positioning corresponds to the position of the drive pin 4 shown in FIG. Therefore, the position where the drive pin 114 is turned counterclockwise by the angle C with respect to the position where the drive pin 114 contacts the cut-and-raised portion 110b is the magnetized position K of the index magnetic pole.

FIG. 1 is a plan view of a first embodiment in which a rotor is attached to a box (magnetized yoke) according to the present invention, and FIG. The magnetizing yoke 20 is a cylindrical box having an open upper surface, and includes a center pin 21 fitted into a center hole 111 of the rotor 110 and a drive pin mounting hole 1 of the rotor 110.
13 and a positioning pin 22 fitted with play, respectively, are erected on the bottom surface 20 a of the magnetized yoke 20, and the center pin 21 is fitted into a center hole 111 of the rotor 110. Are fitted into the drive pin mounting holes 113 of the rotor 110, and the edge of the side wall of the box 20 supports the rotor 110 substantially horizontally.
It is preferable that the diameter of the positioning pin 22 be equal to the diameter of the drive pin 114. However, even if they do not match, the diameter of the positioning pin 22 is constant as long as the same magnetized yoke 20 is used.

Next, when the rotor 110 is rotated clockwise about the center pin 21, the positioning pin 22 comes into contact with the cut-and-raised portion 110 b facing the drive pin mounting hole 110, and the rotation of the rotor 110 is started. Stops.
The angle C measured counterclockwise from the position where the positioning pin 22 contacts the cut-and-raised portion 110b is substantially constant.
This is because the diameter of the positioning pin 22 is constant as long as the same magnetized yoke 20 is used, and since the positioning pin 22 is in contact with the cut-and-raised portion 110b, the position of the positioning pin 22 is also substantially constant.

That is, like the conventional magnetized yoke, the rotor 1
The cut-and-raised portion 1 provided on the side wall 110 a of the rotor 110 instead of using the positioning holes 112
10b is magnetized with reference to the position where it abuts the positioning pin 22 of the magnetized yoke 20, so that the variation in the diameter F of the drive pin 114, the positioning hole 112 and the positioning pin 1
02 and the positioning hole 1
Variations in accuracy due to the 12 angular deviations D and the like can be reduced. Therefore, there is almost no need to finely adjust the motor after completion of the motor.

On the other hand, although not shown, the cut-and-raised portion 110
b is not provided, and the positioning pin 22 is
It is clear from FIG. 1 that the same magnetizing effect can be obtained even when the rotor 110 is configured to contact the side wall 110a of the rotor 110 facing the above.

FIG. 3 is a longitudinal sectional view of the second embodiment when a rotor is mounted on a box (magnetized yoke). The magnetized yoke 30 is a cylindrical box instead of a cylinder, and has a center pin 31 and a positioning pin 32 provided on an upper surface 30a.
Then, the center pin 31 is inserted into the center hole 11 of the rotor 110.
1 and the positioning pin 32 is inserted into the drive pin mounting hole 11.
3 is fitted. The other points are the same as the magnetized yoke 20 including the usage.

FIG. 4 is a longitudinal sectional view of a third embodiment in which a rotor is mounted on a box (magnetized yoke). The magnetized yoke 40 is also a cylindrical box, and the rotor 110 is mounted on the upper surface 40a.
And a positioning pin 41 to be fitted in the drive shaft mounting hole 113 of the rotor 110. That is, the magnetized yoke 40 is magnetized with the rotating shaft 3 fixed to the center hole 111 of the rotor 110. The other points are the same as the magnetized yoke 20 including the usage.

[0023]

According to the present invention, instead of using the positioning hole of the rotor as a reference, the side wall of the rotor facing the drive pin mounting hole or the cut-and-raised portion provided on the side wall of the rotor is formed on the positioning pin provided on the magnetization yoke side. Since the magnetization is performed based on the contact position, variations in the diameter of the drive pin, variations in the clearance between the positioning holes and the positioning pins, and variations in accuracy due to an angular deviation of the positioning holes can be reduced. . Therefore, there is almost no need to finely adjust the motor after completion of the motor.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment in which a rotor is mounted on a box (magnetized yoke) according to the present invention.

FIG. 2 is a longitudinal sectional view of the first embodiment.

FIG. 3 is a longitudinal sectional view of the second embodiment.

FIG. 4 is a longitudinal sectional view of the third embodiment.

FIG. 5 is a longitudinal sectional view of an example of an information recording disk drive motor according to the present invention.

FIG. 6 is a plan view of an example of the information recording disk drive motor.

FIG. 7 is a plan view of a rotor of the information recording disk drive motor.

FIG. 8 is an MM longitudinal sectional view around a drive pin of the information recording disk drive motor.

FIG. 9 is a schematic plan view of a disk hub of the information recording disk drive motor.

FIG. 10 is a plan view when a rotor is attached to a conventional box (magnetized yoke).

FIG. 11 is a longitudinal sectional view of the same.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Information disk drive motor, 3 ... Rotation axis, 10 ... Information recording disk 21, 31 ... Center pin of box, 22,
32, 41: positioning pins, 20, 30, 40: box (magnetized yoke), 40b: recess, 110: rotor, 11
0a: Side wall of rotor, 110b: Cut-and-raised portion of rotor, 111: Center hole of rotor, 113: Drive pin mounting hole, 114: Drive pin, 121: FG (frequency generator), 122: Index signal generating means.

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 15/03 H02K 29/00-29/14 G11B 19/06 G11B 19/20

Claims (3)

(57) [Claims] 1. A rotary shaft fixed to a center hole of a disk-shaped rotor, and a driving pin mounting hole provided at a position deviated from the center hole to transmit a rotational driving force of the rotor to an information recording disk. A drive pin for transmitting a signal, an FG (frequency generator) for generating an FG signal at a timing corresponding to a multi-pole FG magnetic pole provided on the rotor, and an index signal for generating an index signal at a timing of a specific rotation angle position of the rotor Generating means for generating an effective edge of the index signal in accordance with the timing of the FG signal. And a center pin fitted with a positioning pin that fits with a certain play with the drive pin mounting hole of the rotor. The center pin of the rotor is fitted, the positioning pin is fitted with a certain play in the drive pin mounting hole of the rotor, and the rotor is rotated about the center pin as an axis. A magnetizing method for a motor for driving an information recording disk, wherein the magnetizing is performed with reference to a position abutting on a side wall of the rotor facing the drive pin mounting hole. 2. A box body provided with a concave portion fitted with a rotating shaft fixed to a center hole of the rotor and a positioning pin fitted with a drive pin mounting hole of the rotor with a certain play. The rotating shaft was fitted into the recess of the box, the positioning pin was fitted into the driving pin mounting hole of the rotor with a certain play, and the rotor was rotated about the rotating shaft. 2. The method for magnetizing an information recording disk drive motor according to claim 1, wherein: 3. A cut-and-raised portion is provided on a side wall of the rotor facing the drive pin mounting hole, and the positioning pin is magnetized based on a position where the positioning pin contacts the cut-and-raised portion. 3. The method for magnetizing an information recording disk drive motor according to claim 1 or 2, wherein: