JPH0191379A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To make the moving time of a head from an inner track to an outer track and vice versa constant by measuring the moving time of the head from one of the two arbitrary positions to the other and vice versa, and controlling to make the both times equal to each other. CONSTITUTION:When track information to move a head is inputted from an external equipment such as a microcomputer to which a magnetic disk device is connected, the servo head on a carriage 21 first reads servo data from a disk, and the data is inputted to a position detector 23, and at the same time, a sampling signal from a microprocessor 24 is also inputted to the detector 23. Thus cylinder pulse is generated every when the servo head crosses a track in order to obtain the distance from the current track to the target track to which the head should move, then a target speed signal is outputted to a D/A converter 28 from a processor 27. Also, a positioning signal from the detector 23 is supplied to a differentiating circuit 25 to obtain a detected speed, and this speed is subtracted from the target speed signal, and the result is transmitted to a switch 29a to operate a motor 22 so that the head is moved to the target track.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Application on L-Beams) The present invention relates to a magnetic disk device used in, for example, a combi coater or a word processor.

(Prior Art) Conventionally, magnetic disks have been used as external storage means in information processing apparatuses such as computers and word processors υ.

In the magnetic disk loading described above, head positioning is controlled based on servo data recorded on the magnetic disk in advance, and this head positioning control includes speed control, transient illumination, etc. and position III control.

The above-mentioned quick melon control III is a mode when moving the sharp edge having a servo head and a data head, and transient control is a mode in which the head is set on a specific cylinder at the end of the seek operation. .

Further, position control is performed by holding the head on a specific cylinder.

Some of such conventional magnetic disk devices have the following configurations.

FIG. 2 is a block diagram for explaining the structure of a conventional magnetic disk mounting device.

In the figure, 1 is a carriage equipped with a servo head and a plurality of data heads, 2G is a carriage 1 that drives a -t carriage 1 so that each head of the carriage 1 moves on a track of a magnetic disk (not shown). 3 is a position detector that inputs servo data output from the servo head of the carriage 1 to detect the position of the head; 4 is a first microb L that outputs a sample signal to the position detector 3]
It's Sessa. The above-described position detector 3 outputs a sample signal from the microprocessor 4, a head position signal from the servo data, and a cylinder pulse SP output every time the head crosses two tracks on the magnetic disk. In addition, 5 is a device signal composed of a 1d detector 3.
circuit, 6 is a position compensation circuit, 7 is a position compensation circuit, and 7 is a control circuit for moving the head from a host system such as a combination. A second microprocessor 8 outputs a target speed signal according to the difference, and 8 is a digital signal from the microprocessor 7, which transmits the target speed signal (usually a voltage signal) to the target speed. This is a D/A converter that converts signals into signals. Also 9a, 9b, 9C (
A switch for switching each mode in the side circuit; 10 is a manual control of each part in this circuit; an off-cellar 1-complementary tα circuit for making adjustments to eliminate differences and output errors; 11 is each switch 98 N 9b , 9C.

In the magnetic disk drive configured as described above, when information about the track to be moved is manually inputted from the outside, the blade 1 is driven by the Tanabata 2. As a result, each head (not shown) of the carriage 1 is moved C above the magnetic disk (not shown), and the servo head is moved to the 2nd position of the magnetic disk.
Every time the track is crossed, a cylinder pulse SP is outputted from the position detector 3 to the microphone [1 blocker 7]. As a result, the microprocessor "7 calculates the distance difference with the target track (1) and converts the corresponding I'1 target speed information to the D/A
A predetermined current is outputted to the converter 8, whereby a predetermined current is outputted to the motor 2 by the power amplifier 11, and the -1 spear 1 is moved at a predetermined speed. Speed control is performed in this manner.

Furthermore, when the head of 1st track 1 is moved above the 1st track before the target track on the magnetic disk, the switch 9b is turned on, and the position compensation circuit 6 An output signal obtained by reducing the signal output from the power amplifier 11 is output to the power amplifier 11. At this time, the switches 9a and 9c are in the OFF state. Transient control is performed by the closed loop at this time.

Next, the head of F Kill Ridge 1 is fl on the magnetic γ disk.
When moving onto the 1fAt-rack, switch 9C is set to O.
The N state is entered, and the switches 9a and 9b are set to the 0" state. As a result, a closed loop consisting of the position compensation circuit 6, the power amplifier 2!111, and the position detector 3 is formed, and position control is thereby performed.

However, in such a magnetic disk drive J3, the movement of the head toward the inner circumference of the magnetic disk occurs due to mechanical external forces generated by parts around the carriage 1 and electrical input/output errors in each circuit, for example. When the head moves toward the outer circumference, there is a problem in that the time it takes for the head to move toward the inner circumference and the outer circumference with respect to the magnetic disk differs significantly due to the above-mentioned mechanical external force and electrical error. . Therefore, in order to cancel the above-mentioned error in the 'a degree control, the transfer I O! An offset compensation circuit 10 for adjusting the amount is provided as r1. This offset compensation circuit 10 is configured to compensate for the operating condition r of the magnetic disk device.
5, it is necessary to operate an adjustment mechanism such as a polycomb, which causes problems in that these adjustment operations are tedious and difficult to achieve good adjustment.

(Problems to be solved by the invention) The present invention is intended to solve the above-mentioned conventional problems.
(In any range of the disk, the amount of time the head moves from the inner circumference to the outer circumference and from the outer circumference to the inner circumference within that range can be made almost constant, and these shifts f)+times are automatically adjusted. The first objective is to provide a magnetic disk device r'l that can perform the following steps.

[Structure 1 of the Invention (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a servo head for reading the i-nervo data of a magnetic disk and a data head for reading the data. head moving means for moving the head on the disk; head position detection means for detecting the position of each head on the disk from servo data read by the servo head; and positional information of the position to which the head should be moved and the current head. The head moving means is installed in a magnetic disk device J3 equipped with a control means for controlling the movement of the head 11 by determining the position to be moved based on the current position information of the head moving means. The movement of the head between the positions of trQ due to the first
and the second movement 11. when moving from the other position '1 to the -/'J position. j interval lI41
Measure h1 using the distance J1 measuring means, and move the head to any range in J3 using these 11 measurement results as a reference.
The present invention is characterized in that the control stage controls the movement of the head moving means so that the distances are the same.

(Function) The present invention provides a first moving time when moving a head from one position to another position between arbitrary positions, and a first movement time when moving the head from one position to another position. The head moving means is controlled by the control means so that the moving time of the head in the range of (f breath) is the same, using these measurement results as a reference. Since the movement of the head is controlled in any range of the magnetic disk, the amount of time the head moves from the inner circumference to the outer circumference and from the outer circumference to the inner circumference can be kept almost constant, and these movement times can be adjusted automatically.

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

FIG. 1 is a block diagram for explaining the configuration of a magnetic disk device according to an embodiment of the present invention.

In the same figure, C121 is called Seabo Head J3? ! 4-shilling with two data heads, 22 each head of carriage 21 moves over one rack of magnetic disks (not shown)! A key (7) is used to drive the carriage 21. 23 is a position detector that inputs the servo radar output from the servo head of the carriage 21 to detect the position of the head. 24 is a position detector 23. This is a first microprocessor that outputs a sample signal.The above-mentioned position detector 23 detects the sample signal from the microprocessor 24, the head position signal from the main body data, and the two tracks of the Ia disk. It outputs a shilling pulse SP that is output every time it crosses.
25 is a differentiation circuit that differentiates the position signal formed by the position detector 23 and outputs a detected stray signal; 26 is a position compensation circuit; 27 is a small system such as a computer, etc., where the head is to be moved. ] Upon receiving the Muku track address, it determines the distance between this and the current track 11JI*:', and 28 is a microprocessor that determines the distance between this and the current track. Eye P which is a digital signal from 27! :, It is a /Δ converter that converts the speed signal into the target stray signal No. 11 of the Ab [1 signal (normally the electric signal - signal)]. Also 29a
, 29b, 29cs, t switches for switching each L-do in this circuit; 30 indicates each switch 29a, 29
b. It is a gravitational amplifier that outputs a driving current corresponding to the 13th month outputted from '29C. Further, 31 is a timer for measuring the moving time of the head of the Killer Ridge 21 over a given range on the magnetic disk. Output.

Next, the operation of the magnetic disk device configured as described above will be explained.

To use this magnetic disk device, first turn on the power and move the head between any tracks on the magnetic disk. For 71 hours, the microprocessor 27 uses the timer 31 to measure the first moving time of the head from the inner track to the outer track and the second moving time of the head from the outer track to the inner track between the tracks. . Then, the time difference between the first travel time and the second travel time is determined, and the speed information of the microprocessor 27 is corrected so that this time difference is eliminated.

Next, the movement of the head will be explained.

First, when information about a track to be moved is input from an external device such as a computer to which this magnetic disk device is connected, the servo head of the carriage 21 reads servo data from the magnetic disk. This servo data is then output to the position detector 23. Then, the position detector 23 is manually inputted with a microphone (a linsol signal outputted from the brochusher 24), and thereby the head position 7 (signal and servo head traverses 21~ easy) is transmitted from the position detector 23 based on the servo data. A cylinder pulse SP is generated and outputted to the microprocessor 27.The microprocessor 27 calculates the distance difference between the target track to which the head should move and the current track. , furthermore, the microbe 27 outputs E-I +?; The target stray electricity is converted into an analog signal.The position signal output from the position detector 23 is output to the differentiating circuit 25 to find the detected stray electricity, and the detected stray electricity is reduced or stopped from the target stray electricity. The speed control signal is output to the switch 29a.The signal output from the switch 29a, which is turned ON during speed control 1, is amplified by the power amplifier ?J30 and output to the motor 22, thereby driving the carriage 21. The head is moved to the /fi[1 track.

Therefore, in this embodiment, for example, between arbitrary tracks, the first moving time J3 of the head from the inner track to the outer track and the second moving time J3 of the head from the outer track to the inner track are determined in advance. The microprocessor 27 measures the amount using the timer 31 and sends it to J3.
The microprocessor 27 determines the time difference between the first travel time and the second travel time, and calculates the time difference between the first travel time and the second travel time.
Since the speed information has been corrected, it is possible to keep the head movement time approximately constant from the inner circumference to the outer circumference and from the outer circumference to the inner circumference within any one rack of the magnetic disk. Furthermore, these travel times can be automatically adjusted by the microprocessor 27 and timer 31.

Note that in the embodiment described above, the microprocessor 2
Measurement of head movement time using 7 and σ timer 31 is as follows:
The measurement may be performed in advance, for example, when the power is turned on, or may be measured at an arbitrary period.

[Effects of the Invention Song 1 As explained above, in the magnetic disk device of the present invention, the amount of time the head moves from the inner circumference to the outer circumference and from the outer circumference to the inner circumference within a predetermined range of the magnetic disk is almost constant. These travel times can be set automatically.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the configuration of a magnetic disk device according to an embodiment of the present invention, and FIG. be. 21... Carriage, 22... Motor, 23...
Position detector, 24.27...Microprocessor, 3
1... Tine. Applicant Toshiba Corporation Representative Patent Attorney Sasa Suyama −

Claims (1)

[Claims] (1) Head moving means that includes a servo head that reads servo data on a magnetic disk and a data head that reads data, and that moves these heads on the disk, and a head moving means that moves these heads on the disk from the servo data read by the servo head on the disk of each of the heads. head position detection means for detecting the position at , and controlling the movement of the head by the head moving means by determining the amount to be moved from the positional information of the position to which the head should move and the current positional information of the current position of the head. In a magnetic disk drive comprising a control means, in advance, the movement of the head by the head moving means is determined between arbitrary positions and a first movement time when moving the head from one position to the other position. and a second moving time when moving to the one position by a time measuring means,
The magnetic disk device is characterized in that the movement of the head moving means is controlled by the control means so that the movement time of the head in any range is the same, with reference to these measurement results.