JPH02236875A - Disk type information storage device - Google Patents

Abstract

PURPOSE:To use a data surface servo system together with a plural channel parallel transfer system by providing a position adjusting mechanism for each head and a driving control means for each head. CONSTITUTION:A positioning control for magnetic heads 61-6n is performed by head position control parts 181-18n with servo signals S81-8n read from the side of the magnetic heads 61-6n in synchronization with servo information input commencing timing after detecting completion of an arm position control by receiving a completion signal S7 from an arm position control part 20. Piezoelectric elements 91-9n are interposed between each magnetic head 6 and its corresponding head head arm 7, and position signals S1-Sn from the head position control parts 181-18n in a drive main body are converted into piezoelectric element control signals S41-S4n to be sent to the piezoelectric elements 91-9n. Consequently, the head position to the arm 7 can properly and automatically be adjusted in accordance with an elongation/shrinkage of the piezoelectric element 9 for each magnetic head 6. With this constitution, the disk type information storage device can be realized by using the data surface servo system together with the plural channel parallel transfer system.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Field of Application) The present invention relates to a disk-shaped information storage device that writes and reads information to and from a magnetic disk using a magnetic head, and particularly relates to a disk-shaped information storage device that writes information to and reads information from, for example, a magnetic disk using a magnetic head. This invention relates to improvement of a mechanism section that performs positioning control.

(Prior art) Disk storage devices such as magnetic disk devices and floppy disk devices are constantly optimizing performance, increasing speed, and
Miniaturization is required.

Under these circumstances, a method has been proposed in which information is read and written from and to a plurality of magnetic disks using magnetic heads corresponding to each disk, thereby achieving an increase in the capacity of disk-shaped information storage devices.

Furthermore, it has become possible to increase the transfer speed by using a multi-channel parallel transfer method that uses multiple magnetic heads simultaneously to read and write data.

However, in order to achieve larger capacity while reducing the size of disk-type information storage devices, it is necessary to increase the storage density.Also, if a more human-like appearance is achieved, the access time (especially the seek time) will need to be increased accordingly. ) is important.

In order to achieve these goals, a so-called head positioning control technique has been proposed, and generally a servo surface servo method is used in which the entire surface of the 11 disk is dedicated to positioning. In the case of this servo surface servo method, although it has the advantage that servo information can be obtained continuously, it has the disadvantage that the track density cannot be increased due to positional deviation between the servo surface and the data surface due to deformation due to temperature changes.

On the other hand, for example, as shown in FIG. 4, a data sector 2 and a servo sector 3 are provided to a magnetic disk 1, and servo information (position information) 4 is embedded in the position of the servo sector 3 to enable head positioning. In the surface servo method,
To obtain &lJ 1!11 L, for the head position during operation, the track density can be increased to increase the overall storage capacity.

<<Problems to be Solved by the Invention>> However, in the conventional case, when applying the data surface servo method to a disk-shaped information storage device, it was not possible to simultaneously employ the multiple channel parallel transfer method.

In other words, in a conventional disk-type information storage device using a multi-channel parallel transfer method, each magnetic head is fixed to a common arm, so it is inevitably impossible to apply the data surface servo method. There was a limit to how big it could be.

The present invention has been made in view of the above circumstances, and its object is to provide a disk-shaped information storage device that can use both the data surface servo method and the multi-channel parallel transfer method.

[Structure of the Invention] (Means for Solving Problem II) In order to achieve the above object, the present invention provides a system in which each head for reading and writing information to each of a plurality of disks is connected to a corresponding head. In a disk-shaped information storage device mounted on an arm, each of the heads includes a head position adjustment machine that can freely change the head position with respect to the head arm, and a drive control mechanism for this head position adjustment mechanism. The apparatus is characterized in that it comprises a head drive control means for independently controlling the positioning of each of the heads.

<<Operation>> With the disk-type information storage device according to the present invention, it is possible to automatically adjust the head position with respect to the head arm from the outside for each head. However, the data plane servo method can be applied.

Embodiment FIGS. 1A and 1B are configuration diagrams showing a disk section of a disk-shaped information storage f! according to an embodiment of the present invention.

The disk-type information storage device of this embodiment has magnetic disks 1 of a data surface servo type as shown in FIG. 4 arranged at regular intervals on a disk rotating shaft 5 connected to a spindle motor (not shown). I have multiple pieces installed.

The magnetic head 6 that reads and writes information on each magnetic disk 1 is attached to the corresponding head arm 7 as shown in FIG. 2(A). As shown in (B), a head support and a piezoelectric element 9 for a head position adjustment mechanism are interposed. In addition,
Figure 2 (A). In (B), 10.11 is a screw, and 12 is a spacer.

Further, each head arm 7 is pivotally attached to an arm rotation shaft 13, and is driven and controlled by an arm positioning mechanism section 14.

Furthermore, the control configuration of the entire system is a circuit configuration as shown in FIG. 3, and the mounting portions 15 surrounded by dotted lines in FIG. It is something that exists. In the mounting section 15, the signal driving sections 161 to 16n amplify the signals @811 to S1n regenerated by the magnetic heads 61 to 6n and send drive signals 821 to S20 to the receivers 17+ to 17n of the drive body (fixed section).
On the other hand, the head position control signals S3r~ received from the head position control units 181~18n of the drive body
S3n is converted into piezoelectric element control signals @S4+~S4n and sent to the piezoelectric elements 91~9n.

The drive body also includes an index/sector signal generation section 19, an arm position control section 20, a read/write circuit 21, and the arm positioning mechanism section 14. In each part of this drive body, the index/sector signal generation section 17 sets the servo information input start timing to {q
In order to
8n and the arm position control section 20.

The arm position control unit 20 receives a reproduction signal of a predetermined channel p, here an n channel reproduction signal S8n from the receiver 170, in synchronization with the servo information input start timing,
The control signal S6 indicating the arm position is sent to the arm positioning mechanism 1.
4, and after the arm position control is completed, the end signal S
7 is sent to the head position control sections 181 to 18n.

The read/write circuit 21 receives reproduction signals S8+ to S8n of each channel from the receivers 17 to 17n and converts them into binary signals (read data).

In addition, after receiving the end signal S7 from the arm position control unit 20 and detecting the end of arm position control, the head position control units 181 to 18n described above operate the magnetic heads 61 to 6n side in synchronization with the servo information input start timing. The magnetic heads 61 to 6n are activated by the servo signals S8+ to S8n read from the magnetic heads 61 to 6n.
performs position control.

As mentioned above, the magnetic heads 6 (61 to 6n) have piezoelectric elements 9 (91 to 9n) interposed between them and the corresponding head arms 7, and the head position control section 1 of the drive body.
Head position control signals S3+ to S received from 8+ to 18n
3n is converted into piezoelectric element control signals S4+ to S4n and sent to piezoelectric elements 91 to 9n.

Therefore, control can be performed for each magnetic head 6 to automatically adjust the head position relative to the head arm 7 according to the expansion and contraction of the piezoelectric element 9.

Therefore, according to one embodiment of the present invention, a disk-shaped information storage device can be realized by using both the data surface servo method and the multiple channel parallel transfer method.

[Effects of the Invention] As explained above, the disk-shaped information storage device of the present invention has a structure in which the head position relative to the head arm can be externally controlled for each head, and each head can be controlled independently. Since positioning is controlled, the data plane servo method and the multiple channel parallel transfer method can be used together.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a configuration diagram showing the disk section of a disk-shaped information storage device according to an example of the present invention, and FIG. 2 is a detailed view of the main parts of an example according to the present invention. FIG. 3 is a block diagram showing the circuit configuration of an embodiment of the present invention, and FIG. 4 is a diagram showing the disk configuration of the data surface servo system. 1...Magnetic disk 5...Disk rotating shaft 6
, 61-6n...Magnetic head 7...Head arm 8...Head support 9.9
1 to 9n...Piezoelectric element 14 for head position adjustment mechanism...Arm positioning mechanism section 15...Mounting section 16+ to 16n...Signal driving section 171 to 17n...Receiver 181 to 18n... Head position control section 19... Index/sector signal generation section 20... Arm position control section 21... Read/write circuit

Claims (1)

[Scope of Claims] A disk-shaped information storage device in which each head for writing and reading information on each of a plurality of disks is attached to a corresponding head arm, comprising: a head attached to the head arm for each of the heads; a head position adjustment mechanism that can freely change the position; a head drive control means that controls the drive of the head position adjustment mechanism to independently control the positioning of each head;
A disk-shaped information storage device comprising: