JPH02214074A - Head positioning controller for data recording and reproducing device - Google Patents

Abstract

PURPOSE:To always surely perform head positioning control by providing an acceleration sensor, detecting the acceleration of disturbance, and blocking the occurrence of an error at the time of performing a control operation. CONSTITUTION:The acceleration sensor 17 outputs an acceleration signal corresponding to shock and oscillation due to detected disturbance to a positioning control circuit 15. The control circuit 15 performs control so as to block a positioning error generated at a data head 21 based on an acceleration value. Here, a voice coil motor 14 is driven by a driving current from a driving circuit 16, and a carriage 11 is moved in the radius direction of a recording medium 10, and the head 12 is sought to a decided targeted track on the medium 10. The control circuit 15 detects a position error for the targeted track of the head 12 based on servo data from a head 13 sought with the head 12. The motor 14 is controlled so as to dissolve the error, thereby, the positioning can surely be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a head positioning control device for a data recording/reproducing device used, for example, in a node disk device.

(Prior Art) Conventionally, for example, in a hard disk drive, servo information is pre-recorded on the servo surface of a recording medium, and magnetic and horizontal positioning control is performed based on this servo information. The magnetic head is mounted on a carriage, and by controlling the movement of this carriage, it is positioned on a target track on a recording medium.

By the way, when disturbances such as vibrations and shocks are applied to the device from the outside, it affects the positioning operation of the magnetic head.
Positioning errors may occur. In order to eliminate such problems, there is a method in which a vibration isolating material is provided in the head positioning mechanism (carriage drive mechanism) and the disturbance is absorbed by this vibration isolating material. There is also a method of reducing the mass of the head positioning mechanism to reduce the force generated by disturbance. Furthermore, there is a method of increasing the servo band when performing positioning control based on servo information to reduce positioning errors.

(Problems to be Solved by the Invention) Conventionally, for example, in a hard disk drive, if a disturbance is applied while positioning control of a magnetic head is being executed based on servo information, a head positioning error may occur. Therefore, positioning errors due to disturbances are suppressed.
11, various methods can be considered. However, the method using vibration isolating material requires a space for providing the vibration isolating material, which has the disadvantage of hindering miniaturization of the device. Furthermore, there is a limit to reducing the mass of the positioning mechanism due to the structure of the mechanism. Furthermore, in the method of increasing the servo band, it is practically impossible to increase the servo band due to the resonance characteristics of the positioning mechanism and limitations on the sampling frequency when sampling servo information.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head positioning control device for a data recording/reproducing apparatus that can suppress the occurrence of positioning errors due to disturbances during head positioning control operations and always perform reliable positioning control operations.

Arrangement of the Invention j (Means and Effects for Solving the Problems) The present invention provides a head positioning control device for a data recording/reproducing device, in which a disturbance acting on a head that seeks to a target position on a recording medium by driving a carriage is provided. and an acceleration sensor means for detecting acceleration in response to vibrations caused by vibration, etc., and for positioning the head to a target position of the recording medium, and suppressing positioning errors of the head due to disturbance based on the acceleration value detected by the acceleration sensor means. The apparatus is equipped with a positioning control means for driving and controlling a carriage drive means.

With such a configuration, it is possible to suppress the occurrence of head positioning errors due to disturbances without being significantly affected by restrictions such as miniaturization of the apparatus.

(Example) The present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing the configuration when the head positioning control device of the same embodiment is applied to a hard disk drive. 1st
As shown in the figure, in a hard disk device, a recording medium I
A carriage 11 is provided that is movable in the radial direction of O (arrow A). The recording medium 10 consists of a data surface 10a on which normal data is recorded and a servo surface 101) on which servo data is prerecorded. The carriage 11 has a data head that reads/writes data on the data surface 10a.
2 and a servo head 13 for reading servo data from the servo surface lOb are mounted.

The carriage 11 is moved by the driving force of the voice coil motor 14, causing each head 12, 13 to seek in the radial direction of the recording medium 10.

The servo head 13 outputs the servo data read from the servo surface 10b to the positioning control circuit (servo system) 15. The positioning control circuit 15 moves the data head 12 to the data surface 10 based on servo data from the servo head 13.
Positioning control is performed to position the target track a. The positioning control circuit 15 controls the drive current supplied to the voice coil motor I4 through the drive circuit IG,
The movement of the carriage 11 is controlled.

Further, in the present invention, the data head 12 (
That is, an acceleration sensor 17 is provided that detects acceleration according to impact and vibration generated in the servo head 13). The acceleration sensor 17 sends an acceleration signal (voltage signal) corresponding to the shock or vibration caused by the detected disturbance to the positioning control circuit 15.
Output to. The positioning control circuit 15 includes an acceleration sensor 17
data head 1 due to disturbance based on the acceleration value from
Control is performed to suppress positioning errors occurring in step 2.

Next, the operation of this embodiment will be explained. First, the drive circuit 16
The voice coil motor 14 is driven by the drive current from the carriage l.
l moves in the radial direction of the recording medium lO. By this movement of the carriage 11, the data head 12 seeks to the determined target track on the recording medium 10. The positioning control circuit 15 detects a position error of the data head 12 with respect to the target track based on servo data from the servo head 13 that seeks together with the data head 12, and drives the voice coil motor 14 to eliminate this position error. Control.

Here, the servo system of the positioning control circuit 15 is, for example, the second
The concept is as shown in the figure. That is, in the servo system, the target human power R and the output (
An amplifier circuit 20 is provided which multiplies the error E with respect to the value C corresponding to the movement position of the data head 12 by a gain K. Furthermore, a series compensation circuit 21 with a transfer function Gc (s) is provided to stabilize the servo loop. Here, when the force constant of the carriage 11 is Kf and the gain of the current amplification circuit that converts voltage into current is Ki, a drive system 22 is provided that generates a force [N] of "Ki-Kf". There is. The force of this drive system 22 is transferred to the data head 1
There is a position conversion system 23 that converts the movement position C into the second movement position.

In the position conversion system 23, m is the mass of the carriage 11,
S is a differential operator.

In such a servo system, the data head 1 is
2, a force of r9.8XmXDJ is applied to the output point B of the drive system 22. Therefore, a positional deviation Cd as shown in the following equation (1) occurs in the output C.

On the other hand, the acceleration sensor 17 has an amplifier circuit with a gain Ks, and r (9,8XmXD)/(Ki
XKf)J(') Outputs the detection signal (voltage signal) to point A. As a result, the output point B of the drive system 22 is “−9,8
The power of XmxDJ is generated. Therefore, at point B, this r-9,8XmXDJ and the r9.8X crystal xDJ due to disturbance cancel each other out and become "0". That is, when a disturbance affects the data head 12, the impact caused by the disturbance,
The vibration force (force in the theta direction) is canceled out and becomes "0", which is equivalent to a state in which no disturbance occurs.

In this way, by providing the acceleration sensor 17, it is possible to detect the acceleration of the disturbance (force in the theta direction) applied to the data head 12, and perform positioning control that cancels out the disturbance force based on this detection result. becomes. Therefore, the data head 12 can be reliably positioned on the target track without positioning errors caused by disturbances. In this case, there are no restrictions such as the conventional methods of using vibration-proofing materials, reducing the mass of the head positioning mechanism, or increasing the servo band, and it can be applied relatively easily to the device to be controlled. It is possible.

[Effects of the Invention] As detailed above, according to the present invention, by providing an acceleration sensor that detects the acceleration of disturbance, it is possible to suppress the occurrence of positioning errors due to disturbance during head positioning control operation. becomes. Therefore, it is possible to always perform reliable head positioning control operations without being subject to restrictions such as increasing the size of the apparatus.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a conceptual diagram of a servo system for explaining the operation of the embodiment. lO...recording medium, 11...carriage, 12...
・Data head, 13... Servo head, 15...
Positioning control circuit, 17... acceleration sensor. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Scope of Claims] A carriage equipped with a head for recording and reproducing data on a recording medium; a carriage driving means for moving the carriage in a radial direction of the recording medium; and a carriage driving means for moving the carriage in a radial direction of the recording medium; When a disturbance acts on the head seeking to the target position of the medium,
an acceleration sensor means for detecting acceleration according to vibrations caused by the disturbance, and positioning the head to a target position on the recording medium;
and positioning control means for driving and controlling the carriage driving means based on the acceleration value detected by the acceleration sensor means so as to suppress positioning errors of the head due to the disturbance. Equipment head positioning control device.