JPH05274833A - Device for writing magnetic disk positioning signal - Google Patents

Abstract

PURPOSE:To position a magnetic head without touching when the signal for positioning the magnetic disk is written. CONSTITUTION:A reference clock signal is written in a disk assemly 11 incorporating the magnetic disk in a spindle motor for satisfying a phase correction condition with a constant clock frequency using a clock head 17 and the magnetic disk positioning signal by a magnetic head 12 using the reference clock signal is written. The magnetic head 12 follws up a rotary encoder 16 by an optical disk plate 151 on a magnnetic head rotation supporting mechanism 13, an optical head 152 on the rotary encoder 16, a servo system 18 and a head driving motor 14. By positioning the rotary enconder using an encoder driving motor, the magnetic head 12 is positioned without touching and the positioning signal is written in the magnetic disk device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk positioning signal writing device.

[0002]

2. Description of the Related Art In recent years, a magnetic disk positioning signal writing device is subject to device distortion due to mechanical stress at the time of writing the positioning signal and at the end of assembly of the magnetic disk device, as the density of magnetic disk devices having positioning signals tends to increase. In order to minimize the position signal, the opening portion of the disk device at the time of writing the position signal is minimized, so to speak, the positioning signal tends to be written in a state where the cover of the disk device is attached to the disk plate.

A conventional magnetic disk positioning signal writing device will be described in detail with reference to the drawings. Figure 3
(A), (b) is a side view which shows an example of the prior art, and its A.
FIG.

The magnetic disk positioning signal writing device shown in FIGS.
A magnetic head 12, a head rotation support mechanism 13, a head drive motor 14, a head clamp mechanism 35,
The rotary encoder 16 and the clock head 17 are included.

The disk assembly 11 incorporates a magnetic disk in a spindle motor, and a reference clock signal and a positioning signal described later are written therein. The magnetic head 12 is rotatably supported by the head rotation support mechanism 13, and positioned by the position detection by the rotary encoder 16 and the rotational motion by the head drive motor 14, and the positioning signal is sent to the magnetic disk assembly 11 by using the reference clock signal. Write. The head clamp mechanism 35 holds the magnetic head 12 so that the central axes of the rotary encoder 16 and the head rotation support mechanism 13 are aligned with each other.

FIG. 4 is a perspective view showing the operation of the head clamp mechanism 13. The magnetic head clamp mechanism shown in FIG. 4 includes a magnetic head 40, a clamp A41, and a clamp B.
42, the magnet A 43, the magnet B 44, the head rotation support mechanism 13, and the rotary encoder 16.

The magnet A43 mounted on the clamp A41 and the magnet B44 mounted on the clamp B42 are magnetized so that an attractive force is generated between them.
The head clamp mechanism 13 can hold the magnetic head 12 by the clamp B44 sandwiching the protrusion-shaped body formed by the head rotation support mechanism 13 and the magnetic head 12. The clock head 17 writes a reference clock signal having a constant clock frequency and satisfying the phase matching condition on the disk circumference.

[0008]

Since the above-mentioned conventional magnetic disk positioning signal writing device uses the pinching method for the head clamp mechanism, there are the following drawbacks in minimizing the disk opening. It was (1) Since the sandwiching mechanism holds the magnetic head, the operating range becomes large and the opening cannot be made small. (2) Due to the pinching operation, a contact operation occurs in the disk device, and dust is generated.

[0009]

A magnetic disk positioning signal writing device of the present invention is a disk assembly in which several magnetic disks are incorporated in a spindle motor, and a constant clock frequency and phase matching on the circumference from the magnetic disk. A clock head that writes and reads a reference clock signal that satisfies the conditions, a magnetic head that writes a positioning signal using the reference clock signal, a rotary encoder that detects the position of the magnetic head by a servo system described later, and a positioning of the rotary encoder An encoder drive motor, a head rotation support mechanism that supports the rotational movement of the magnetic head and is positioned on the rotation axis of the rotary encoder, an optical disk plate formed on the head rotation support mechanism, and the rotary encoder. With a light head A relative angle detection mechanism for detecting a rotation angle deviation between the head rotation support mechanism and the rotary encoder, and a deviation correction motion is given to the magnetic head based on a relative angle deviation signal of the relative angle detection mechanism. It is configured to include a head drive motor, and a servo system that corrects the deviation using the relative angle detection mechanism and the head drive motor.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings. 1 (a) and 1 (b) are a side view and an AA sectional view showing an embodiment of the present invention.

The magnetic disk positioning signal writing device shown in FIGS.
, Magnetic head 12, head rotation support mechanism 13, head drive motor 14, relative angle detection mechanism 15, rotary encoder 16, and encoder drive motor 161.
And a clock head 17 and a servo system 18.

The disk assembly 11 incorporates a magnetic disk in a spindle motor, and a clock signal and a positioning signal described later are written therein. Magnetic head 1
The head 2 is rotatably supported by the head rotation support mechanism 13, and is positioned by the relative angle detection mechanism 15, the servo system 18, and the head drive motor 14 so that the relative angle deviation of the rotary encoder 16 is minimized. Track pitch 1 using position resolution
A minute position such as 0 μm is detected, and a positioning signal is written in the magnetic disk assembly 11. At this time, the rotary encoder 16 is positioned by the encoder drive motor. Further, the head rotation support mechanism 13 is held so that its central axis coincides with the rotation center of the rotary encoder 16.

2A to 2C show a relative angle detecting mechanism 1
5 is a perspective view, an optical path diagram, and a graph showing the operation of FIG. The relative angle detecting mechanism shown in FIG. 2A is composed of an optical head 152 mounted on the rotary encoder 16 and an optical disk plate 151 on the head rotation supporting mechanism 13.

A cross section of the optical head 152 and the optical disc 151 is shown in FIG. The optical disc 152 includes an objective lens 20, a beam splitter 21, a two-divided sensor 22, and a laser diode 23. Guide grooves 24, 25, and 26 are formed in the optical disk plate 151. The laser light emitted from the laser diode 23 passes through the beam splitter 21 and the objective lens 20, is reflected by the guide groove, and enters the two-divided sensor 22 as diffracted light. When the optical head 152 is positioned by the rotary encoder 16 and the encoder motor 161, the optical disc plate 151 causes a relative angular displacement movement with the optical head 152 by the movement of the head rotation support mechanism 13.

FIG. 2 (c) is a graph showing the relationship between the relative angle and the amount of diffracted light. When the laser light is interlinked with the guide grooves 24, 25 and 26 in order due to the displacement motion, the guide grooves 24 to A signal is generated above 26 and between the guide grooves 24-26.
In the vicinity of this signal, there is a linearity in the change of the angular shift and the change of the diffracted light amount, so that it is possible to construct a servo system in which the relative angle is constant, which is realized by the positioning of the optical disk device of 0.1 μm. The following position deviations can be achieved.

[0016]

The magnetic disk positioning signal writing device of the present invention has the following effects because the magnetic head and the rotary encoder are mounted in a non-contact manner. (1) It is only necessary to form an opening or a transparent portion through which laser light can pass, and a significantly smaller opening than the pin clamp method is required. (2) No dust is generated in the magnetic disk.

[Brief description of drawings]

1A and 1B are a side view and an AA sectional view showing an embodiment of the present invention.

2A to 2C are a perspective view, an optical path diagram, and a graph showing the operation of the relative angle detection mechanism 15.

3 (a) and 3 (b) are a side view and an AA cross-sectional view showing an example of a conventional example.

FIG. 4 is a perspective view showing the operation of the head clamp mechanism 13.

[Explanation of symbols]

 11 Disk Assembly 12 Magnetic Head 13 Head Rotation Support Mechanism 14 Head Drive Motor 15 Relative Angle Detection Mechanism 16 Rotary Encoder 17 Clock Head 18 Servo System 20 Objective Lens 21 Beam Splitter 22 Two-Division Sensor 23 Laser Diode 24-26 Guide Groove 35 Head Clamp Mechanism 41 Clamp A 42 Clamp B 43 Magnet A 44 Magnet B 151 Optical Disc Plate 152 Optical Head 161 Encoder Drive Motor

Claims (1)

[Claims] 1. A disk assembly in which several magnetic disks are incorporated in a spindle motor, and a clock head for writing and reading a reference clock signal having a constant clock frequency and satisfying a phase matching condition on the circumference from the magnetic disk. A magnetic head for writing a positioning signal using the reference clock signal, a rotary encoder for detecting a position of the magnetic head by a servo system described later, an encoder drive motor for positioning the rotary encoder, and a rotary motion of the magnetic head for supporting the rotary motion. A head rotation support mechanism positioned on the rotary shaft of the rotary encoder, an optical disc plate formed on the head rotation support mechanism, and an optical head attached to the rotary encoder, and the head rotation support mechanism and the rotary encoder. Between A relative angle detection mechanism for detecting a turning angle deviation, a head drive motor for giving a deviation correction motion to the magnetic head based on a relative angle deviation signal of the relative angle detection mechanism, the relative angle detection mechanism and the head drive A magnetic disk positioning signal writing device, comprising: a servo system that corrects the deviation using a motor.