JPH03280274A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain magnetic head positioning control capable of reducing the load of a CPU by generating a speed correcting signal by the integration of VCM driving currents. CONSTITUTION:A burst data for generating a position signal indicating the current position of a magnetic head 32 is detected by a detection circuit 34 and inputted to the CPU 36 through an A/D converter 35. The CPU 36 generates the position signal, calculates a position correcting signal S based upon the position signal and outputs the signal S to an adder 42 through a D/A converter 37. On the other hand, an integration circuit 41 integrates a driving current (a) outputted from a VCM driving circuit 38 at the time of a position control mode, generates a speed correction signal V and outputs the signal V to the adder 42. The adder 42 adds the signal V to the signal S to generate a correction signal G and outputs the signal G to the circuit 38. The driving current (a) corresponding to the signal G is supplied from the circuit 38 to the VCM 39 and the head 32 is positioned on an objective track through a carriage 40.

Description

Detailed Description of the Invention [Object of the Invention] (Industrial Application Field) The present invention relates to a data surface servo type magnetic recording and reproducing device.

(Prior Art) Conventionally, in hard disk drives, there is a data surface servo method in which servo information is recorded on the data surface.

In this data surface servo method, for example, servo information consisting of track identification information unique to each track and burst data as magnetic head position information is recorded for each sector. In a servo type hard disk drive, a position signal is created based on this servo information, and the positioning of the magnetic head is controlled using this position signal.

This positioning control can be roughly divided into a speed control mode and a position control mode. In the speed control mode, a speed signal is created by differentiating a device signal made up of servo information, and speed control is performed in which an error between this speed signal and a target speed signal is corrected.

In the position control mode, after the magnetic head has moved to the target track in the speed control mode, a position control operation is performed to correct an error between the current position based on the position signal and the center of the target track.

By the way, in the closed loop servo system, generally, when switching from speed control mode to position control mode, position control using a speed correction component and a position correction component is executed. The outline will be described below with reference to FIG.

FIG. 2 is a block diagram showing the configuration of a conventional sector servo type hard disk device. Servo information consisting of track identification information and burst data is recorded on the recording medium 11 for each sector. The magnetic head 12 seeks on this recording medium 11 and records/reproduces data. Here, burst data for each sector is detected from the read signal of the magnetic head 12 by the sector detection circuit 13 and the burst data detection circuit 14 . This burst data is converted into a digital signal through the A/D converter 15, and is sent to the CPU 1 as a sample position signal.
It is manually operated by B.

The CPU 1B determines the current position and moving speed of the magnetic head 11 from this sample position signal, calculates a correction signal by combining the position correction component and the speed correction component, and adjusts the position of the magnetic head 12 based on this correction signal. Execute control. The above calculated correction signal is given to the VCM drive circuit 18 through the D/A converter 17. The VCM drive circuit 18 controls the VCM based on the input correction signal.
(Voice coil motor) 19 is driven. This VCM1
9 is a motor for driving the carriage 20 on which the magnetic head 12 is mounted. As a result, the magnetic head 12
will be positioned on the target track via the carriage 20.

(Problem to be Solved by the Invention) As described above, conventionally, the CPU 1B calculates the position correction signal and speed correction signal of the magnetic head 12 based on servo information, and processes the position correction signal and speed correction signal. This required complicated arithmetic processing for calculating the combined correction signal. This places a burden on the CPU 1B, posing problems such as requiring a DSP (digital signal processor) 21, for example.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a magnetic recording/reproducing apparatus that can perform positioning control of a magnetic head while reducing the burden on the CPU in a data surface servo system.

[Configuration of the Invention (Means and Effects for Solving the Problems) In other words, the present invention provides a magnetic recording/reproducing device using a data plane servo system, in which a position correction signal generated based on servo information and a voice coil motor are driven. Based on the correction signal obtained by adding the speed correction signal generated by integrating the current,
This drives the voice coil motor to position the magnetic head on the target track.

According to such a configuration, only the position correction signal needs to be calculated based on the servo information within the CPU;
It is possible to perform positioning control of the magnetic head with a reduced burden on the U.

(Embodiment) Hereinafter, a magnetic recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of, for example, a sector servo type hard disk device. In the sector servo method, servo information consisting of track identification information and burst data is recorded in advance for each sector of the recording medium (data surface) 31. The magnetic head 32 is connected to this recording medium 31.
Seek in the radial direction to record/reproduce data.

The sector detection circuit 33 detects the sector of the read signal of the magnetic head 32 and outputs a detection timing signal.

The burst data detection circuit 34 detects burst data, which is servo information, based on the detection timing signal from the sector detection circuit 33. The A/D converter 35 converts the analog burst data detected by the burst data detection circuit 34 into a digital signal.

The CPU 3B creates a position signal for the magnetic head 32 based on the burst data from the A/D converter 35, and calculates a position correction signal. The D/A converter 37 converts the digital position correction signal from the CPU 3B into an analog signal. The VCM drive circuit 38 supplies a drive current a to a VCM (voice coil motor) 39 based on the correction signal G from the adder 42 .

VCM 39 is a motor for driving carriage 40. The carriage 40 is equipped with a magnetic head 32,
This magnetic head 82 is caused to seek in the radial direction of the recording medium 31. The integrating circuit 41 integrates the drive current a of the VCM 39 and generates a speed correction signal V. The adder 42 is D/
The position correction signal S from the A converter 37 and the speed correction signal V from the integrating circuit 41 are added to generate a correction signal G.

Next, the operation of this embodiment will be explained.

Servo information is recorded in advance on the recording medium 31 for each sector. In the same embodiment, the servo information consists of track identification information and burst data. The track identification information is information unique to each track. The burst data is data for generating a position signal indicating the current position of the magnetic head 32. This burst data is detected by the burst data detection circuit 34 and provided to the CPU 3B through the A/D converter 35. The CPU 38 generates a position signal for the magnetic head 32 based on this burst data, and uses the position signal to calculate only a position correction signal. This position correction signal is a signal for correcting an error with the target position, and is outputted to the adder 42 through the D/A converter 37.

Here, this embodiment is characterized in that when the speed control mode is switched to the position control mode, the drive current a of the VCM 39 is used to generate the speed correction signal V of the magnetic head 32. That is, in the position control mode, V
A drive current a output from the CM drive circuit 38 is given to an integration circuit 41.

The integrating circuit 41 generates a speed correction signal (■) by integrating this drive current a, and outputs this to the adder 42. The adder 42 adds the speed correction signal V and the position correction signal S from the D/A converter 37 at a predetermined ratio to generate a correction signal G for positioning the magnetic head 32 on the target track. and outputs it to the VCM drive circuit 38. As a result, a drive current a corresponding to the correction signal G is supplied from the VCM drive circuit 38 to the VCM 39, and the magnetic head 32 is positioned on the target track via the carriage 40.

In this way, position correction signals S and VC based on servo information
The magnetic head 32 is positioned by the speed correction signal V based on the M drive current. In this case, the CPU 3B only needs to calculate the position correction signal S based on the servo information (burst data).

Therefore, the burden on the CPU 3B is reduced, and unlike the conventional SP, it is not necessary, and the mounting area of components can be reduced.

Furthermore, although speed detection based on position information is usually done in the form of differentiation, since the speed is detected based on the VCM drive current base, which corresponds to acceleration, it is resistant to high-frequency noise. This results in
It becomes less susceptible to the roughness of the S/N ratio of the recording medium.

Furthermore, since velocity detection can be obtained continuously, followability is improved compared to the conventional case where servo information is used as a sample position signal.

[Effects of the Invention] As described above, according to the present invention, since the speed correction signal is generated by integrating the VCM drive current, the positioning control of the magnetic head is performed in a data surface servo system with a reduced burden on the CPU. It is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a configuration according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional configuration. 31... Recording medium, 32... Magnetic head, 33...
- Sector detection circuit, 34... Burst data detection circuit, 35... A/D converter, 3B... CPU. 37...D/A converter, 88...VCM drive circuit, 39-VCM. 40...Kyarin O

Claims (1)

[Claims] In a data surface servo-type magnetic recording/reproducing device that records/reproduces data by seeking a magnetic head in the radial direction of a recording medium by driving a voice coil motor, the servo control is performed based on a read signal of the magnetic head. a servo information detection means for detecting information; a signal generation means for generating a position correction signal for the magnetic head based on the servo information detected by the servo information detection means; and a signal generation means for integrating the drive current of the voice coil motor. , integrating means for generating a speed correction signal for the magnetic head; and adding the position correction signal generated by the signal generating means and the speed correction signal generated by the integrating means to move the magnetic head to a target track. A magnetic recording and reproducing apparatus comprising: an adding means for generating a correction signal for positioning; and a motor driving means for driving the voice coil motor based on the correction signal generated by the adding means. .