JP2586295B2 - Head seek device for disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head seek apparatus for a disk, and more particularly to a head seek control apparatus in a coarse seek mode for seeking a head near a target track on a disk.

[0002]

2. Description of the Related Art In a conventional disk drive, particularly in a coarse seek mode, a head seek area 51, a constant velocity area 52 (maximum speed), and a deceleration during a coarse seek are shown in FIG. A head seek control method has been proposed in which a region 53 is controlled so as to trace a trapezoidal speed profile 50 in which the region 53 is determined in advance (for example, Japanese Patent Application Laid-Open Nos. 03-080476 and 03-025).
765).

On the other hand, a head seek control method has been proposed which does not use a speed profile but captures the movement of the head in order of acceleration, constant speed (maximum speed), deceleration, and stop (for example, Japanese Patent Laid-Open No. 02-195581). Reference).

In the seek control of the head by the conventional head seek control method, the present head moving speed is calculated based on the distance the head has moved in the radial direction of the disk and the time required for the head movement, and the head moving speed is determined in advance. This is performed by adjusting the applied voltage to the head drive mechanism by comparing and calculating the target speed.

[0005]

In the head seek control method of the conventional disk drive, when the head is moved in the coarse seek mode in which the head is moved in the radial direction of the disk, the head is driven at a constant speed (the maximum speed at a constant speed or a constant speed). , For example, there is an area indicated by reference numeral 52 in FIG.

Therefore, there is a problem that the seek time cannot be sufficiently reduced in the coarse seek mode of the head.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a disk head seek apparatus capable of shortening a head seek time during a coarse seek of a disk apparatus.

[0008]

According to the present invention, there is provided a head seek apparatus for a disk drive in which a head for reading and writing information on a disk is moved in a radial direction of the disk by a head drive mechanism. A control device for controlling the operation of the head driving mechanism so that the head always has acceleration when the head is moved in a coarse seek mode for seeking near a target track on a disk; The controller moves the head at a speed corresponding to the applied voltage, and the control device moves the head to the current position when a seek command is issued in the coarse seek mode .
Track to the target track that the head should reach
And the value of the acceleration at the time of the predetermined acceleration
And the acceleration value during deceleration and the preset head
From the time distribution ratio of the speed time and the deceleration time, the acceleration time and
A head seek device for a disk is obtained in which a deceleration time is calculated and a voltage applied to the head drive mechanism is controlled in accordance with the calculated value .

[0009]

[0010]

[0011]

According to the present invention, the ratio of the acceleration time to the deceleration time of the head is calculated in advance to control the voltage application to the head driving mechanism. , The seek time can be reduced.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the configuration of a disk drive according to an embodiment of the present invention. As shown in FIG. 1, a disk drive 1 according to an embodiment of the present invention includes a disk 2 for storing information, and a spindle motor unit 3 for rotating the disk 2.
A head 4 for reading and writing information on the surface of the rotating disk 2, a guide 5 made of a rod material slidably inserted into through holes 4 a on both sides of the head 4, and guiding the head 4; A head drive mechanism 7 provided at the lower end of the head 4 for moving the head 4 in the radial direction 6 of the disk 2;
And a control device 8.

[0014] head seek device for a disk comprises a disk 2 of the disk device, the portion excluding the spindle motor unit 3, i.e., a head 4, a guide 5, a head driving mechanism 7, and a control device 8 It is configured. The moving speed of the head 4 is controlled by the magnitude of the voltage applied to the head drive mechanism 7 from the control device 8. The head driving mechanism 7 includes a linear motor or a voice coil motor, and its driving is controlled by applying a voltage in which positive and negative step-like voltages are temporally paralleled from a control device 8.

Next, referring to explain FIG operation of the disk for f <br/> Ddoshiku apparatus according to an embodiment of the present invention. As shown in FIG. 2A, a head seek device for a disk drive according to an embodiment of the present invention has a head 4 having a triangular velocity profile 1 including an acceleration region 11 and a deceleration region 12.
0 is configured as depicted, when there is a seek command to the target track of the disk 2 to the head 4, the head 4 is present
Target track that the head 4 should reach from the track at which it is located
And the acceleration at a preset acceleration
Value and acceleration value at the time of deceleration, and a preset head
Time distribution ratio of acceleration time t ₁ and deceleration time t ₂
Calculate the acceleration time t ₁ and deceleration time t ₂
The voltage application state to the head drive mechanism 7 is controlled in accordance with the calculated value .

FIG. 2B shows the read / write operation of the disk 2.
A full-stroke seek in which the head 4 seeks from the innermost track to the outermost track in the writing area as a target track, and a one-third in which the head 4 seeks with a track in which the rotation speed of the disk 2 is the average rotation speed as a target track.
The case of a stroke seek is shown. The time required to reach near the target track, that is, the coarse seek time is indicated by t 'and t ", respectively, and the acceleration time is respectively
t ₁ ′, t ₁ ″ and deceleration time are indicated by t ₂ ′, t ₂ ″, respectively.

In the case of the embodiment of the present invention, the time distribution ratio between the acceleration time t ₁ ′, t ₁ ″ and the deceleration time t ₂ ′ , t ₂ ″ of the head 4 is predetermined, and t ₁ + t ₂ = t. , T ₁ '+
t ₂ ′ = t ′, t ₁ ″ + t ₂ ″ = t ″, t ₁ / t ₂ = t
Has become _{1 '/ t 2' = t} 1 "/ t 2" = to control as k (a constant).

As described above, in order to realize the control method of the head driving mechanism, the controller 8 sets the remaining distance from the track where the head 4 is currently located to the target track to which the head 4 should reach, and the preset distance . Average value of acceleration during acceleration
And the acceleration value at the time of deceleration and the preset head 4
Acceleration time ( eg, t ₁ , t ₁ ′, t ₁ ″) and deceleration time
(For example, t ₂ , t ₂ ′, t ₂ ″)
Then , the acceleration time (t ₁ , t ₁ ′, t ₁ ″) and the deceleration time (t ₂ , t ₂ ′, t ₂ ″) are calculated. During the acceleration time, the voltage is continuously applied to the head drive mechanism to decelerate. During the time, control is performed by applying a voltage having the opposite sign to the applied voltage.

[0019] As described above, obviously according to the head seek device for a disk according to an embodiment of the present invention, the moving speed of the head 4 as in the prior art is in no region is a constant speed, thus referring to FIG. 3 In this way, the coarse seek time can be reduced.

[0020]

As described above, according to the present invention, in the coarse seek mode in which the head seeks to the vicinity of the target track on the disk, when the head moves to all the target tracks, the acceleration (decrease) speed is always applied to the head. By controlling the head drive mechanism in such a manner, the coarse seek time of the head can be shortened.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a disk device according to an embodiment of the present invention.

[Figure 2] in which the control state of the head seek speed of the disk head seek device of FIG. 1 were graphed, (A) is a schematic of a control state, (B) a full stroke seek of the head, 1/3 stroke seek Respectively show the control states.

FIG. 3 is a graph illustrating a comparison between an example of the present invention and a conventional example.

FIG. 4 is a graph showing a control state of a head seek speed according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk device 2 Disk 3 Spindle motor 4 Head 5 Guide 7 Head drive mechanism 8 Control device

Claims (1)

(57) [Claims] 1. A head seek apparatus for a disk drive for moving a head for reading and writing information on a disk in a radial direction of the disk by a head driving mechanism, wherein the head seeks to a position near a target track on the disk. A control device for controlling the operation of the head driving mechanism so that the head always has an acceleration when the head is moved in a seek mode, wherein the head driving mechanism operates the head at a speed corresponding to an applied voltage; In the coarse seek mode, when a seek command is issued, the control device controls the track on which the head is currently located.
From the target track to which the head should reach
Release, predetermined acceleration value during acceleration and during deceleration
Of the head acceleration and the preset head acceleration time and
The acceleration time and the deceleration time are calculated from the time distribution ratio of the speed time.
A head seek apparatus for a disk, wherein the head seek mechanism for a disk calculates a voltage applied to the head drive mechanism in accordance with the calculated value .