JPH04345975A - Device for writing positioning signal of magnetic disk - Google Patents

Abstract

PURPOSE:To facilitate the attachment of a magnetic head and to shorten the writing time of a positioning signal by providing an encoder mounting mechanism capable of elastically deforming and engaging. CONSTITUTION:A positioning signal is written into a magnetic disk of a disk assembly 11 by a rotary encoder 17 where a reference clock signal is written. A magnetic head 12 mounts a rotary encoder 16 to a head revolution support mechanism 13 to acquire the position information and is also driven by a head drive motor 14 for positioning. When both encoders 16 and 17 are mounted the encoder mounting mechanisms 15 and 18 are engaged into the encoder mounting grooves 15a and 18a formed on the assembly 11 and the mechanism 13 respectively by means of the elastic deformation of a piezoelectric element.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for writing positioning signals onto a disk medium surface of a magnetic disk device.

0002

[Technical environment] In recent years, magnetic disk positioning signal writing devices have been designed to shorten positioning signal writing time and increase production volume, as magnetic disk devices with positioning signals have become smaller and have been mass-produced. The trend is to reduce the number of parts in order to lower prices.

0003

[Prior Art] A conventional magnetic disk positioning signal writing device includes a disk assembly in which several magnetic disks are assembled into a spindle motor, and a standard for maintaining a constant clock frequency on the circumference from the magnetic disk and satisfying phase matching conditions. A clock head that writes and reads clock signals, a magnetic head that writes positioning signals, a head rotation support mechanism that supports the rotational movement of the magnetic head, a rotary encoder that detects the position of the magnetic head, and a center that grips the head rotation support mechanism. The magnetic head is configured to include a head clamp mechanism that holds the shaft so that it coincides with the center of the rotary encoder, and a head drive motor that provides rotational motion to the magnetic head.

Next, a conventional magnetic disk positioning signal writing device will be explained in detail with reference to the drawings.

FIG. 3 is a perspective view showing a conventional example. The magnetic disk positioning signal writing device shown in FIG.
, encoder mounting groove 38 and head clamp mechanism 3
It consists of 9. The disk assembly 31 is
A magnetic disk is built into the spindle motor, and positioning signals are written to it. rotary encoder 37
A reference clock signal that has a constant clock frequency and satisfies the phase matching conditions is written in advance. The magnetic head 32 is supported in rotation by a head rotation support mechanism 33, and is positioned by position detection by a rotary encoder 36 and rotation by a head drive motor 34, and sends a positioning signal to the magnetic disk assembly 31 using the reference clock signal. Write. The head clamp mechanism 39 clamps the magnetic head 32 so that the central axes of the rotary encoder 36 and the head rotation support mechanism 33 coincide.
hold.

Next, the operation of the head clamp mechanism will be explained with reference to FIG. The head clamp mechanism 39 shown in FIG. 4 includes a magnetic head 40, a clamp A41, a clamp B42, a magnet A43, a magnet B44, a head rotation support mechanism 45, and a rotary encoder 46. Magnet A mounted on clamp A41
43 and the magnet B44 mounted on the clamp B42 are magnetized so as to generate an attractive force with each other.
5 and the magnetic head 40, the head clamp mechanism 39 can hold the magnetic head 40.

[0007]

SUMMARY OF THE INVENTION The conventional magnetic disk positioning signal writing device described above has the following drawbacks because it uses a clamping method for the head clamp mechanism.

(1) When the magnetic head is not in a specific location, the pinching operation range becomes wide, the holding force by the magnet is weak, and it becomes difficult to pinch the magnetic head.

(2) In order to compensate for the above-mentioned pinching operation, if another drive system is used to expand the pinching range, the moment of inertia of the mechanism increases, making it difficult to drive the head drive motor inside the magnetic disk. become.

0010

[Means for Solving the Problems] The present invention provides a disk assembly in which a magnetic disk is assembled into a spindle motor, a first rotary encoder in which a reference clock signal is written in advance, and a first rotary encoder that fits into a groove formed in the disk assembly. a first encoder mounting mechanism that holds the disk assembly so that its center axis coincides with the center axis of the first rotary encoder by elastically deforming the disk assembly; and a magnet that writes a positioning signal using the reference clock signal. a head, a head rotation support mechanism that supports rotation of the magnetic head, a second rotary encoder that detects the position of the magnetic head, a head rotation support mechanism that supports rotation of the head, and a position of the head. A second rotary encoder for detecting the head rotation support mechanism is fitted into a groove formed in the head rotation support mechanism and elastically deformed so that the central axis of the disk assembly is aligned with the central axis of the second rotary encoder. The head drive motor includes a second encoder mounting mechanism for holding the second rotary encoder, and a head drive motor for applying positioning motion to the head based on a position signal from the second rotary encoder.

Furthermore, the fitting portions of the first encoder mounting mechanism and the second encoder mounting mechanism may include piezoelectric elements that are elastically deformed by voltage application.

0012

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. The magnetic disk positioning signal writing device shown in FIG. 1 includes a disk assembly 11, a magnetic head 12, a head rotation support mechanism 13, a head drive motor 14,
It is composed of encoder mounting mechanisms 15 and 18, encoder mounting grooves 15a and 18a, and rotary encoders 16 and 17.

The disk assembly 11 incorporates a magnetic disk into a spindle motor, and a positioning signal is written therein. A reference clock signal having a constant clock frequency and satisfying phase matching conditions is written in advance in the rotary encoder 17. The encoder mounting mechanism 15 uses the encoder mounting groove 15a to hold the disk assembly 11 so that the central axes of the rotary encoder 17 and the disk assembly 11 are aligned.

The magnetic head 12 has a head rotation support mechanism 1.
The rotary motion is supported by rotary encoder 1.
6 and rotational movement by the head drive motor 14, and a positioning signal is written in the magnetic disk assembly 11 using the reference clock signal. Further, the encoder mounting mechanism 18 uses the encoder mounting groove 18a to hold the magnetic head 12 so that the central axes of the rotary encoder 16 and the head rotation support mechanism 13 are aligned.

Next, the operation of the encoder mounting mechanisms 15 and 18 will be explained with reference to FIG. 2. The encoder mounting mechanism shown in FIG. 2 includes a disk assembly 20, an encoder mounting mechanism 21, an encoder 22, and a clamp body 2.
3, a piezoelectric element 24, and an encoder mounting groove 25. By applying a voltage to the piezoelectric element 24 mounted on the encoder mounting mechanism 21, the clamp body 23 expands and contracts within the range of elastic deformation, and the encoder mounting groove 2
The encoder can be held by contacting the clamp body 23 at 5. Further, in a state where the clamp body 23 is not elastically deformed, the encoder 22 can be removed from the disk assembly 20.

[0017]

Effects of the Invention The magnetic disk positioning signal writing device of the present invention utilizes elastic deformation in the fitting portion of the groove portion to attach the magnetic head and the rotary encoder, and therefore has the following effects.

(1) By forming the circular groove portion and the fitting portion, the magnetic head and the rotary encoder can be easily attached even if the magnetic head is not located at a specific location.

(2) It is possible to realize a mounting mechanism with a small enough volume that the mating part can be elastically deformed, and since the groove part is formed, the moment of inertia of the mounting part is small, and it can be driven by the head drive motor inside the magnetic disk. becomes easier.

[Brief explanation of drawings]

FIGS. 1A and 1B are a configuration diagram and a sectional view taken along line A-A, showing an embodiment of the present invention.

2] Parts (a) to (c) are a perspective view, an A-plane sectional view, and a B-plane sectional view showing the encoder mounting mechanism of FIG. 1. FIG.

FIGS. 3A and 3B are a configuration diagram and a sectional view taken along the line B-B of a conventional example.

FIG. 4 is a perspective view showing a head clamp mechanism of a conventional magnetic disk positioning signal writing device.

[Explanation of symbols]

11, 20, 31 Disk assembly 12, 3
2, 40 Magnetic head 13, 33, 45 Head rotation support mechanism 14, 3
4 Head drive motor 15, 18, 21, 35
Encoder mounting mechanism 15a, 18a, 25, 3
8 Encoder mounting grooves 16, 17, 36, 37
, 46 Rotary encoder 22 Encoder 23 Clamp body 24 Piezoelectric element 39 Head clamp mechanism 41 Clamp A 42 Clamp B 43 Magnet A 44 Magnet B

Claims (2)

[Claims] 1. A disk assembly in which a magnetic disk is assembled into a spindle motor, a first rotary encoder in which a reference clock signal is written in advance, and a first rotary encoder that fits into a groove formed in the disk assembly and is elastically deformed. The central axis of the disk assembly is the first
a first encoder mounting mechanism that holds the rotary encoder so as to be aligned with the central axis of the rotary encoder; a magnetic head that writes a positioning signal using the reference clock signal; and a head rotation support mechanism that supports the rotational movement of the magnetic head. , a second rotary encoder that detects the position of the magnetic head, a head rotation support mechanism that supports rotation of the head, a second rotary encoder that detects the position of the head, and a head rotation support mechanism formed on the head rotation support mechanism. a second encoder mounting mechanism that holds the central axis of the disk assembly so as to be aligned with the central axis of the second rotary encoder by fitting into the groove portion and being elastically deformed; A magnetic disk positioning signal writing device comprising: a head drive motor that provides positioning motion to the head based on a position signal. 2. The fitting portion of the first encoder mounting mechanism and the second encoder mounting mechanism includes a piezoelectric element that is elastically deformed by voltage application.
The magnetic disk positioning signal writing device described above.