JP2531107Y2 - Chuck table - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive chuck table of a recording apparatus for reading and writing data on a magnetic disk or an optical disk.

[0002]

2. Description of the Related Art In a recording apparatus for writing and reading data to and from a magnetic disk or an optical disk, a disk is mounted on a chuck table attached to an outer rotor motor and the disk is rotated.

In such a recording apparatus, an index magnet is provided on a rotor yoke of a motor in order to determine a recording start reference position of a disk, and a magnetic detecting element such as a Hall element for detecting the index magnet is provided on a printed circuit board. .

In a conventional recording apparatus, as shown in FIGS. 3 and 4 , an index magnet 4 is composed of a drive pin 6 provided on a chuck base 1 around a spindle 5 which is a rotating shaft on the outer periphery of a rotor yoke 9 of a motor 10 and an arrow in the drawing. The magnetic detecting element 7 is fixed on the printed board 8 outside the rotor yoke 9 so as to be fixed at a certain angle in the rotation direction of the disk indicated by A.

The drive pin 6 engages with a reference hole formed in the hub of the disk, rotates the disk by driving a motor, and also determines the recording start reference position of the disk.

[0006]

As described above, in the recording apparatus having the conventional motor, the index magnet is provided on the outer periphery of the rotor yoke of the motor, so that the index magnet and the chuck table provided on the rotor yoke at the time of assembly are used. It is necessary to accurately set the positional relationship with the provided drive pins, and there has been a problem that if the positional relationship is displaced due to assembly, the magnetic recording characteristics become unstable.

[0007] The index magnet projects outward from the outer periphery of the rotor yoke of the motor.
Since the magnetic detecting element for detecting this is further provided on the printed circuit board outside the rotor yoke of the motor, it is practically impossible to provide other parts on the printed circuit board around the rotor yoke. The space has not been effectively used, and the demand for further downsizing of the recording apparatus has not been met.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a chuck base according to the present invention has a hub base having a hole at the center for firmly fitting with a rotating shaft of a motor, and a chuck base around the hub base. A chucking magnet for mounting a disc is provided, and an index magnet is attached to the chucking magnet of the chuck base having a drive pin that is projected from a hole of the hub mount or the chucking magnet by a leaf spring provided on one surface of the chucking magnet. Provided by integral molding and index magnet
In the right place on the printed circuit board near the circular orbit,
Magnetic detection element to detect the arrival of
The ratio of the height L to the cross-sectional area A of the index magnet is L /
The structure is such that A ≧ 1.0 .

[0009]

1 and 2 are partial longitudinal plan views showing an example of an outer rotor motor having a chuck base according to the present invention.

In the drawing, reference numeral 1 denotes a chuck table, and a center has a hub table 2 fixedly fitted to a spindle 5 of an outer rotor motor 10, around which a chuck magnet 3 for mounting a disk is provided. On the lower surface of the king magnet 3, a round shaft-shaped index magnet 4 molded integrally with the king magnet 3 is projected.

A hole 1a for projecting the drive pin 6 from the upper surface of the chuck table is formed at a position at an angle of 87 ° from the index magnet 4 of the chuck table in the disk rotation direction indicated by the arrow A with the spindle 5 as a center. ing.

The drive pin 6 is provided at the free end of a leaf spring 11 attached to the lower surface of the hub base. The drive pin 6 is projected from the hole 1a to the upper surface of the chuck base by the elasticity of the leaf spring 11, and is connected to the hub of the disk. The disk is rotationally driven by engaging with the opened reference hole.

A magnetic detecting element 7 for detecting the magnetic force of the index magnet 4 and capturing the recording start reference position of the disk is provided on a printed circuit board 8 immediately below a circular orbit on which the index magnet 4 rotates together with the chuck table 1. I have. The index magnet 4 has, for example, a round shaft shape.
And the ratio of the height L to the cross-sectional area A is L /
A ≧ 1.0.

An outer rotor motor 10 serving as a rotary power source of the chuck base 7 is provided on the opposite side of the chuck base of the spindle 5 serving as a rotation axis and the printed board 8.

The outer rotor motor 10 has a structure in which a rotor yoke 9 having a rotor magnet 14 on an outer peripheral flange is provided at a lower end of the spindle 5 and is composed of a soft magnetic disk. The outer ring 13a is fixedly fitted to the outer periphery of a stator 15 in which a coil 16 is wound on a soft magnetic pole plate and fixedly attached to the outer periphery of the stator 12 inserted into a printed circuit board. I have.

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026] Incidentally, chucking magnet 3 and hub seat 2 can also be formed integrally.

[0027]

[Effect of the Invention] Since the present invention has the above-described structure, the position of the index magnet with respect to the drive pin does not shift during assembly, and the recording start reference position of the disc can be detected with high accuracy. And exhibit more stable magnetic recording characteristics.

Further, there is no need to provide a magnetic detecting element outside the rotor yoke on the printed circuit board, so that the space on the printed circuit board can be used effectively, the mounting of components can be centralized, and the recording apparatus can be further miniaturized. There is.
Furthermore, the index magnet has a height L and a cross-sectional area A.
Since the ratio is set so that L / A ≧ 1.0, the magnetic resistance
Low resistance and low demagnetization at low temperature
it can.

[Brief description of the drawings]

FIG. 1 is a partially broken plan view showing an example of an outer rotor motor including a chuck base according to the present invention.

FIG. 2 is a partially longitudinal front view of the same.

FIG. 3 is a partially broken plan view of a conventional recording apparatus.

FIG. 4 is a partially longitudinal front view of the same.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 chuck base 1a hole 2 hub base 3 chucking magnet 4 index magnet 5 spindle 6 drive pin 7 magnetic detection element 8 printed board 9 rotor yoke 10 outer rotor motor 11 leaf spring 12 housing 13 bearing 13a inner ring 13b outer ring 14 rotor magnet 15 stator 16 coil 17 Notch hole A Disk rotation direction

Claims (1)

(57) [Scope of request for utility model registration] 1. A hub base having a hole at the center for firmly fitting with a rotating shaft of a motor, a chucking magnet for mounting a disk around the hub base, and provided on one surface of the chucking magnet. A magnetic detecting element for integrally providing an index magnet to the chucking magnet of the chuck base having a drive pin projected from a hole of the hub mount or the chucking magnet by a leaf spring and detecting the arrival of an index set .
The index magnet has a height L and a cross-sectional area A.
A chuck table having a ratio of L / A ≧ 1.0 .