JPH0262772A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To increase the storage capacity by obtaining head position information from a laser stripe sheet adhered to a base or a top cover or the like through the use of a laser pickup. CONSTITUTION:The device is provided with a laser stripe sheet 14 with position information of a magnetic head written thereupon and fixed to a prescribed position, a laser pickup fitted to a member 6 in interlocking with magnetic heads 2A-2Z so as to read position information and a magnetic head movement control means using the position information to apply positioning control of the magnetic head. That is, a position signal is inputted to a servo control circuit 12 via a preamplifier 16 and an AGC circuit 17. Then while as logic circuit 13 allows a servo control circuit 12 to apply drive control of a voice coil motor 11, read/write of a data is applied through the read/write heads 2A-2Z. Thus, all sides of the magnetic disk are used as data faces to increase the storage capacity.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic disk device.

(Prior Art) Magnetic disk drives have been widely used as external storage devices for information processing equipment such as computers and word processors.

FIG. 2 is a diagram showing the configuration of a conventional magnetic disk device.

In the figure, IA to IZ are disks with magnetic recording surfaces formed on both sides, 2A to 2X are read/write heads that read/write data on the data surfaces of these disks,
2Y is a servo head that reads servo data from the servo surface (in this case, the bottom surface) of the disk, 3 is a spindle that rotates the disk, and 4 is a base that holds various parts such as a spindle motor.

Further, 5 is a top cover that seals the inside of the magnetic disk device. 6 is an actuator that supports the read/write head and the servo head in an interlocking manner.

7 is a preamplifier that amplifies the data signal input/output to the read/write heads 2A to 2Y; 8 is an AGC circuit that increases/decreases the gain of the data signal; 9 is the servo head 2
Preamplifier that amplifies the servo signal output from Y, 1
0 is an AGC circuit that increases or decreases the gain of the servo signal; 11
is a voice coil motor that moves the actuator 6,
12 is a voice coil motor 1 based on a preformed servo signal.
A servo control circuit 13 controls the servo control circuit 1, and a logic circuit 13 processes the data signal and outputs various command signals to the servo control circuit 12.

In this device, servo data is recorded in advance on the servo surface of the disk, and a logic circuit 13 performs positioning control of read/write heads 2A to 2X via a servo control circuit 12 in accordance with a servo signal output from a servo head 2Y. .

(Problems to be Solved by the Invention) However, in this type of magnetic disk device, one surface of the disk is used as a dedicated servo surface, so there is a problem in that the storage capacity is reduced accordingly.

The present invention was made under these circumstances, and aims to provide a magnetic disk device that effectively uses all surfaces of the disk and has a large storage capacity.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve this object, the magnetic disk device of the present invention includes a laser stripe sheet on which position information of a magnetic head is written in advance and fixed at a predetermined position. , a laser pickup attached to a member interlocking with the magnetic head so as to read the position information, and a magnetic head movement control means for controlling the positioning of the magnetic head using the position information.

(Function) In the magnetic disk device of the present invention, head position information is
Since it is obtained from a laser stripe sheet fixed to a base or top cover, all sides of the magnetic disk can be used as data surfaces, increasing the number of data surfaces by one surface.

(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, IA to 1z are disks with magnetic recording surfaces formed on both sides, 2A to 2Z are read/write heads that read/write data on each surface of these disks, 3 is a spindle that rotates the disks, and 4 is a spindle that rotates the disks. This is a base that holds various parts such as a spindle motor.

A top cover 6 5 seals the inside of the device and is an actuator that supports the read/write head and the servo head in an interlocking manner.

7 is a preamplifier that amplifies the data signal output to the read/write heads 2A to 2Y, 8 is an AGC circuit that increases or decreases the gain of the data signal, 11 is a voice coil motor that moves the actuator 6, and 12 is a voice coil. Servo control circuit for controlling motor 11, 1
3 is a logic circuit that processes the data signal and outputs a command signal to the servo control circuit 12;

14 is a laser stripe sheet on which head position information is written and is fixed to the base 4; 15 is a laser pickup that is attached to the actuator 6 and reads out the position information from the laser stripe sheet 14.

Further, 16 is a preamplifier that amplifies the position signal output by the laser pickup 14, and 17 is an AGC circuit that increases or decreases the gain of the position signal.

In this device, data is recorded on all sides of the disk, and the positioning of the read/write heads 2A to 2Z is controlled according to a position signal output by a laser pickup 15 that is moved by a common actuator 6 with the read/write heads 2A to 2Z. is being carried out.

That is, the laser pickup 15 irradiates the laser stripe sheet 14 with laser light, the laser pickup 15 receives the reflected light, and the position signal represented by the intensity is sent to the servo control circuit 12 via the preamplifier 9 and the AGC circuit 10. Enter. The logic circuit 13 causes the servo control circuit 12 to drive and control the voice coil motor 11 while reading/writing data through the read/write heads 2A to 2Z.

Thus, according to this embodiment, a surface that has conventionally been used as a servo surface and no data read/written can be effectively used as a data surface.

The laser stripe sheet 14 only needs to be fixed to the base 4, and a servo writer, which has been indispensable in the past, becomes unnecessary.

Note that the laser stripe sheet 14 is not limited to the base 4 and may be fixed to the top cover 5, but in this case, the laser pickup 15 is arranged above the read/write head 2A.

That is, the laser pickup 15 is connected to the actuator 6
The laser stripe sheet 14 may be attached to any other position as long as the position information can be read from the laser stripe sheet 14 in conjunction with the laser stripe sheet 14.

[Effects of the Invention] As explained above, the magnetic disk drive of the present invention uses a laser pickup to obtain head position information from a laser stripe sheet fixed to the base or top cover, so that information on all surfaces of the disk can be obtained. can be used as a data surface and has a large storage capacity.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing an example of the configuration of a conventional magnetic disk device. IA~1Z...magnetic disk, 2A~2X, 2Z...
・Read/write head, 2Y... Servo head, 3
... Spindle, 4... Base, 5... Top cover 6... Actuator, 7.9.16... Preamplifier, 8.10, 17... AGC circuit, 11... Voice Coil motor, 12... Servo control circuit, 13... Logic circuit, 14... Laser stripe sheet, 15... Laser pickup. Applicant: Toshiba Corporation

Claims (1)

[Claims] (1) A laser stripe sheet on which position information of a magnetic head is written in advance and fixed at a predetermined position, a laser pickup attached to a member that interlocks with the magnetic head so as to read out the position information, and the position information 1. A magnetic disk drive comprising: magnetic head movement control means for controlling the positioning of the magnetic head using the magnetic head movement control means.