JPH10144022A - Information recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head capable of dealing with disks having various diameters. SOLUTION: A disk D is held by a clamper 25a and controlled to a specified rotational speed by a spindle motor 21 to be rotated. A magnetic head 32 is rotated and moved in a diameter direction in the surface and the backside of the disk D by an encoder unit via a head assembly 33 and a head arm 31. When the diameter of the disk D is changed, this disk D is dealt with by making variable a distance between the rotational center of a motor 27 equipped with an encoder for rotating the magnetic head 32 and that of the spindle motor 21 for rotating the disk D.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing apparatus used for a hard disk inspection apparatus, a servo signal recording apparatus, an optical disk test apparatus, and the like.

[0002]

2. Description of the Related Art FIG. 11 is a plan view of a conventional information recording / reproducing apparatus, and FIG. 12 is a side view thereof. A spindle motor 2 is fixed on a base 1, and the spindle motor 2 is attached to one end of an air bearing 3. A motor 4 is provided, and an encoder 5 is attached to one end of the motor 4. On the other hand, a clamper 6 for fixing the disk D is provided at the other end of the air bearing 3 so that the disk D is removably mounted. A linear motion stage 7 is provided on the base 1, and a lead screw 8 is provided at the center of the linear motion stage 7. The lead screw 8 is connected to a motor 10 via a coupling 9. I have. A movable stage 11 is engaged with the lead screw 8, and one end of an arm 12 is fixed on the movable stage 11.
A head 13 is held at the other end of 2.

The rotation speed of the spindle motor 2 is controlled by a drive circuit (not shown) based on the angle signal of the encoder 5, and rotates the disk D at a constant speed. Motor 1
By controlling the amount of rotation of 0, the movable stage 11 moves on the translation stage 7 via the lead screw 8 and moves the head 13 held at the tip of the arm 12 to an arbitrary position.

[0004]

However, in this conventional information recording / reproducing apparatus, the lead screw 8 is not used.
Because the coupling 9 is interposed between the motor and the motor 10,
The rigidity of the mechanical system cannot be increased, and the high-speed movement of the head 13 is limited, and the positioning accuracy of the motor 10 for driving the lead screw 8 to rotate and the coupling 9
Since there are many structural errors such as deformation of the lead screw 8 and backlash of the lead screw 8, a problem also arises in the positioning accuracy of the head 13.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an information recording / reproducing apparatus capable of accurately positioning a head corresponding to disks of various diameters.

[0006]

According to the present invention, there is provided an information recording / reproducing apparatus comprising: a spindle motor for rotating a disk-shaped disk for recording and reproducing information magnetically; An information recording / reproducing apparatus having a head driving unit for rotating a head for recording / reproducing
A drive motor for driving the head to rotate, a first scale having a disk-shaped angle scale provided at a spindle end of the drive motor, and a first scale for optically measuring an angle by the scale of the first scale. And a head holding portion provided at the other end of the support shaft of the drive motor, wherein the head is rotated and positioned on a recording area of the disk.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a plan view of the information recording / reproducing apparatus of the first embodiment, and FIG. 2 is a side view. A spindle motor 21 is fixed on the base 20. The spindle motor 21 is integrally formed with a rotor of an electromagnetic motor 23 at a lower end of a shaft of an air bearing 22, and an encoder for measuring an angle is provided at the other end of the motor 23. 24 are provided. A clamper 25 is provided at the upper end of the shaft of the air bearing 22.
Is provided, and the disk D is removably mounted thereon. The spindle motor 21 is connected to a spindle motor drive unit (not shown) and is controlled at an arbitrary rotation speed.

A stage 26 is fixed to the base 20, and a movable portion of the stage 26 which moves in a linear direction has
An encoder unit 29 including a motor 27 and an encoder 28 is attached. Here, the movable direction of the stage 26 is parallel to a straight line A connecting the rotation center of the spindle motor 21 and the rotation center of the encoder unit 29. The scale of the encoder 28 is fixed to the lower end of the support shaft 30 of the motor 27, and two head arms 31 are fixed to the upper end of the support shaft 30. A head assembly 33 having a magnetic head 32 fixed to each of the head arms 31 is fixed.
1, the magnetic head 32 and the head assembly 33 are arranged on the front and back of the disk D in pairs.

FIG. 3 shows the configuration of the encoder unit 29. The support shaft 30 is fixed to a pair of ball bearings 40 and is rotatably supported. Further, a plurality of magnets 41 are fixed to the support shaft 30, a coil 42 having an appropriate gap is provided around the magnet 41, and a yoke 43 is formed by laminating thin plates around the coil 42. Ball bearing 4
0 is pressurized by a spring 44. Support shaft 30
The disk-shaped scale 45 of the encoder 28 is integrally provided at an end of the rotary shaft, so that the angle of the rotating portion including the support shaft 30 can be measured.

FIG. 4 is a side view of the spindle motor 21 and FIG. 5 is a side view of a rotating part thereof. The air bearing 22 is composed of a rotor 50, a stator 51 and a plate 52. That is, the rotor 50, the stator 51, and the plate 52
The stator 51 and the stator 51 are arranged with a small gap at the boundary. As a result, air supplied from the outside flows into each boundary from the stator 51 to form an air film. 22 operates. A support shaft 53 of the electromagnetic motor 23 is integrally formed on the plate 52, and the support yoke 53 includes a rotor yoke 5 made of a magnetic material.
Four and a plurality of magnets 55 are fixed. A disk-shaped scale 56 of the encoder 24 is integrally provided at an end of the support shaft 53 so that an angle of a rotating portion including the support shaft 53 can be measured.

1 and 2, a disk D is held by a clamper 25, and is rotated at a predetermined rotational speed by a spindle motor 21. The magnetic head 32 is rotationally moved in the diameter direction on the front and back of the disk D by the encoder unit 29 via the head assembly 33 and the head arm 31. The encoder unit 29 is positioned by a control unit (not shown).
Is a sine wave of 81,000 cycles, which is divided into 1,024 by a multiplier inside the control unit, so that the minimum resolution is 156 / 36,000,000.
00 degrees. Accordingly, the distance from the center of rotation of the encoder unit 29 to the tip of the head assembly 33 is set to 1
When it is set to 00 mm, the minimum resolution of the tip is 7.6n.
m.

FIG. 6 is a plan view when the diameter of the disk D is smaller, and FIG. 7 is a side view. The stage 26 is driven to determine the distance between the rotation center of the spindle motor 21 and the rotation center of the encoder unit 29. This shows the case where the size is reduced. As a driving means for changing the moving distance, a bearing and a stepping motor or a servomotor are used to change the moving distance by a coupling and a lead screw as in the conventional example, or a bearing and a linear motor are used. Then, a method of controlling the moving distance by an encoder may be adopted.

FIG. 8 is a view for explaining the operation of the magnetic head 32. At the position A, the magnetic head 32 is substantially horizontal with respect to the rotation direction of the disk D. OD or ID from this position A
When the head driving unit is moved in the direction, the magnetic head 32 has a predetermined angle with respect to the rotation direction of the disk D. Therefore, in order to adjust this, the head driving unit is moved linearly by the movable unit of the stage 26 so that the magnetic head 32 is substantially horizontal with respect to the rotation direction of the disk D. In this way, the magnetic head 32 can be positioned at any position on the disk D by the polar coordinate system, and the angle between the magnetic head 32 and the disk D can be set arbitrarily.

FIG. 9 is a plan view of an information recording / reproducing apparatus according to a second embodiment, and FIG. 10 is a side view thereof. A spindle motor 21 is fixed substantially at the center of a base 60. As in the first embodiment, the spindle motor 21 has a rotor of an electromagnetic motor 23 integrally formed at the lower end of the shaft of the air bearing 22 and an encoder 24 at the lower end of the electromagnetic motor 23. . A disk D is removably mounted on the upper end of the shaft of the air bearing 22, and the spindle motor 21 is controlled at an arbitrary rotational speed via a spindle motor drive unit. At least two encoder units 6 using ultrasonic motors as drive motors are provided on both sides of the spindle motor 21.
0a and 60b are provided.

A magnetic head 6 is provided at the tip of the head assemblies 61a and 61b of the encoder units 60a and 60b.
2a and 62b are attached, and head assemblies 61a and 61b are head arms 63a and 63b, respectively.
b, the head assemblies 61a, 61
b, magnetic heads 62a, 62b, head arm 63a,
63b are arranged on the front and back of the disk D in pairs.
The two head arms 63a and 63b are fixed to the support shafts of the ultrasonic motors 64a and 64b, respectively.
The other ends of the support shafts 4a and 64b have encoders 65 respectively.
The scales a and 65b are fixed, and the ultrasonic motors 64a and 64b and the encoders 65a and 65b are integrated.

The encoder units 61a and 61b are mounted on movable portions of stages 66a and 66b which are driven in a linear direction.
It is fixed to 0. Here, the stages 66a, 66b
Is parallel to a straight line connecting the rotation center of the spindle motor 21 and the rotation center of the encoder unit, and the encoder units 60a and 60b can be positioned by a control unit (not shown).

As described above, one spindle motor 21
By providing a plurality of encoder units 60, these encoder units 60 can be selectively used, and the recording and reproducing time for the disk D by the magnetic head 62 can be shortened.

[0018]

As described above, the information recording / reproducing apparatus according to the present invention can move with high accuracy and high speed by positioning the recording area of the disk using the motor having the rotary positioning means. This makes it possible to adjust the relative angle between the head and the disk at the same time, so that a wider operating environment can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a side view.

FIG. 3 is a sectional view of an encoder unit.

FIG. 4 is a side view of the spindle motor.

FIG. 5 is a side view of the spindle motor.

FIG. 6 is a plan view showing a state in which a small-diameter disk is placed.

FIG. 7 is a side view.

FIG. 8 is an explanatory diagram of the operation of the head.

FIG. 9 is a plan view of the second embodiment.

FIG. 10 is a side view.

FIG. 11 is a conventional plan view.

FIG. 12 is a side view.

[Explanation of symbols]

 20, 60 Base 21 Spindle motor 23 Electromagnetic motor 24, 28, 65 Rotary encoder 29, 60 Encoder unit 26, 66 Stage 31, 63 Head arm 32, 62 Magnetic head 64 Ultrasonic motor D disk

Claims (6)

[Claims] 1. An information recording / reproducing apparatus comprising: a spindle motor that rotationally drives a disk-shaped disk that magnetically records and reproduces information; and a head drive unit that rotates a head that magnetically records and reproduces information. A drive motor for driving the head to rotate, a first scale having a disk-shaped angle scale provided at a spindle end of the drive motor, and a first scale for optically measuring an angle by the scale of the first scale. An information recording / reproducing apparatus, comprising: an encoder described above; and a head holding unit provided at the other end of the support shaft of the drive motor, wherein the head is rotated and positioned on a recording area of the disk. . 2. The method according to claim 1, wherein the spindle motor and one or more of the head driving units are mounted on a same base plate, and a distance between a rotation center of the spindle motor and a rotation center of the head driving unit is linearly changed. The information recording / reproducing apparatus according to claim 1, further comprising a moving unit that moves. 3. The spindle motor according to claim 1, wherein the spindle motor includes an electromagnetic driving unit mainly including a magnet or a coil, a fluid bearing or a ball bearing mainly using air as a medium, and a disk provided at an end of a support shaft of the electromagnetic driving unit. 2. The information recording / reproducing apparatus according to claim 1, wherein the information recording / reproducing apparatus is constituted by a second scale having an angled scale and a second encoder that optically measures an angle using the scale of the second scale. 4. The head drive section calculates a target position based on angle information from a first encoder by a position control device, and drives the drive motor at an arbitrary speed.
An information recording / reproducing apparatus according to claim 1. 5. The moving means according to claim 2, wherein the moving means uses a stepping motor or a servo motor as a power source, and drives the movable stage linearly by rotating a lead screw via a coupling. Information recording and reproducing device. 6. The moving means uses a linear motor as a power source, has an encoder for measuring a moving distance of the movable stage, and performs position control by the encoder to linearly drive the movable stage. 3. The information recording / reproducing device according to 2.