JPS6139273A - Head position initial set system of disc device - Google Patents

Abstract

PURPOSE:To eliminate a need for a stopper by discriminating presence of a detection signal of a sensor by a discriminating means and allowing a control means to move a magnetic head toward the inner circumference when it is at the outermost peripheral track of a disc or more and then moving the head from the inner circumference to the outermost peripheral track. CONSTITUTION:Whether or not a photo sensor 27 outputs a detection signal is discriminated. When a detecting plate 24 shuts the light of the photo sensor 27 to generate a detection signal, that is, when a magnetic head at a position in broken lines 21 of carriages 11, 13 is at a position corresponding to the autermost track of the disc or outward, a step motor 20 is turned by one step toward the arrow M2 and the carriages 11, 13 are moved by one step toward the inner circumference of the disc. Then the magnetic head is moved toward the disc inner circumference from a track 00 once and the magnetic head is moved toward the disc outerward at each step unitl the detection signal of the photo sensor 27 is generated. Thus, no stopper is required and the adjustment of the mounting position of the stopper is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a head position initial setting method for a disk device, and more particularly to a head position initial setting method for a disk device that initializes the head position of a magnetic head.

Conventional technologyFlexible disks (hereinafter simply referred to as ``disks'')
There is a disk device that records and reproduces information on concentric tracks of a rotating disk by placing a magnetic head in contact with the surface of the rotating disk.

In such a disk device, for example, when the power is turned on, a carriage with a magnetic head attached thereto is moved toward the outer circumference of the disk, and the magnetic head is initially set at a position corresponding to the outermost track (track 00) of the disk. Thereafter, the magnetic head is moved toward the inner circumference of the disk one track at a time by rotating the step motor that drives the carriage one step at a time.

In conventional disk drives, in order to initialize the head position, a sensor detects the end of the carriage in the moving direction when the magnetic head is set at a position corresponding to track O0.

Problems to be Solved by the Invention Conventionally, if a sensor detection signal is not obtained when the power is turned on, the carriage is moved toward the outer circumference of the disk to seek track OO until the sensor generates a detection signal. However, if a sensor detection signal is obtained when the power is turned on, the initial setting of the head position is completed in that state without moving the carriage. For this,
A conventional disk device is provided with a stopper that restricts the carriage from moving toward the outer circumference of the disk from a position corresponding to track 00. Incidentally, the track pitch on the disk is extremely small, for example, 264 μm, and the carriage moves 264 μm for each step of the step motor. Therefore, there is a problem in that it is very time consuming to adjust the mounting position of the stopper so that the carriage comes into contact with it at a position corresponding to track 00.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a head position initial setting method for a disk device that solves the above-mentioned problems by providing a determination means and a control means.

Means for Solving the Problems As shown in FIG. 1, the present invention uses sensors 24 and 27 to generate a detection signal when the magnetic head is on the outermost track of the disk and on the outer (or inner) side of the outermost track. occurs. The determining means X determines whether there is a detection signal from the sensor 24 or 27 and supplies the determination result to the control means Y. The control means Y moves the magnetic head toward the inner circumference when there is a detection signal from the sensor 27, and moves the magnetic head to the outermost track when the detection signal from the sensor 27 disappears.

Operation In the method of the present invention, the sensor 24,
The presence or absence of a detection signal from 27 is determined.

The control means Y moves the magnetic head to the inner circumference side if the magnetic head is on the outermost track of the disk or on the outer circumference side thereof, according to the determination result of the discrimination means X.

Thereafter, the magnetic head is moved from the inner circumferential side to the outermost circumferential track.

Embodiment First, a disk device to which the method of the present invention is applied will be explained with reference to FIG. The disk device shown in FIG. 2 was previously proposed by the present applicant in Japanese Patent Application No. 58-209645 1 titled "Flexible Disk Device" and others. In the figure, the disk is inserted into the plane between the spindle hub 1 and the collet 2 in the direction of arrow C. The front edge of the inserted disk (indicated by a two-dot chain line in the figure) comes into contact with the disk receiving portion 3a of the eject slider 3, and pushes the eject slider 3 in the direction of arrow C. When the head shift lever 4 engages with the notch 3b, the disk sensor 5 issues a signal, the solenoid plunger 6 is driven for a predetermined period of time, and the plunger 6a is attracted in the direction of arrow C. As a result, the solenoid lever 7 and the clamp slider 8 slide in the direction of arrow C, and the clamp slider 8 moves toward the lock lever.
9 is locked. At this time, the shift lever 10 is rotated by the roller 8a in the direction of the arrow E, the collet 2 is moved in the direction of the arrow B, and the disk is clamped to the collet 2 and the spindle hub 1.

The carriage 11 is guided by the guide bar 12 and moves in the direction of arrow C.
The carriage 11 is capable of sliding in the 2D direction, and a magnetic head 11a is attached to the carriage 11. Further, a carriage 13 is disposed above the carriage 11 in the figure, and a magnetic head is mounted on the carriage 13.
It is attached opposite to 1a. Before inserting the disk, the carriage 13 has its engaging portion 13a resting and abutting on the head shift lever 4, and the head shift lever
4 engages with the notch 3b, it moves in the direction of arrow B and approaches the disk inserted between the carriages 11 and 13.

This carriage 13 is moved along with the carriage 11 by arrows C and D.
sliding displacement in the direction.

Furthermore, when the carriage 13 receives a head load signal from the host computer, it is further displaced and driven in the direction of arrow B, and the magnetic heads attached to each of the carriages 11 and 13 come into contact with both sides of the disk, recording information on the disk. - Playback is performed.

When the eject button (not shown) is operated after recording and playback to the disc is completed, the solenoid plunger 6 is driven for a predetermined period of time, and the solenoid lever 7, which had been returned in the direction of the arrow C by the coil spring 14, is moved in the direction of the arrow C. slide into the
The protrusion 7a of the solenoid lever 7 is the eject lever 15
It collides with the protrusion 15a. As a result, the eject lever 15 rotates in the direction of arrow F and pushes down the lock lever 9, and the clamp slider 8 is released from the lock lever 9, and together with this, the protrusion 4a of the head shift lever 4
is pushed up by the eject lever 15, the engagement between the head shift lever 4 and the notch 3b of the eject slider 3 is released, and the carriage 13 moves in the six directions of the arrow. After that, when the drive of the solenoid plunger 6 is stopped, the eject slider 3. The solenoid lever 7 and the clamp slider 8 are slid in the direction indicated by the arrow by the coil springs 16, 14, 17, respectively, the collet 2 is moved in the direction indicated by the arrow 6, and the clamp on the disk is released.
Also, the disk is inserted into the disk receiving part 3 of the eject slider 3.
8 and is ejected from this disk device.

The above carriage 11.13 is shown in FIG. 3(A).

It is driven by a step motor 2o shown in (B). 3(A>, , (B), the carriage 13 is mounted on the carriage 11, and the dashed line 21 in FIG. 3(A>)
Magnetic heads (11a, etc.) are attached to the carriages 11 and 13, facing each other, at the positions shown in FIG.

The step motor 20 is of a four-phase drive type, and is fixedly attached to a mounting plate 22 provided on the frame of the disk device. The rotation shaft 23 of the step motor 2o is attached to the mounting plate 22.
It is inserted through and protrudes from an opening window (not shown) bored in the. A detection plate 24 and a pulley 2 are provided at the tip of the rotating shaft 23.
5 are fixed, and these rotate together with the rotating shaft 23. A steel belt 26 is wound around the outer periphery of the pulley 25.

A substantially central portion of the steel belt 26 is screwed to the pulley 25, one end 26a of the steel belt 26 is screwed to one end of the drive section 11b of the carriage 11, and the other end 26a is screwed to one end of the drive section 11b of the carriage 11.
b is screwed to the other end of the drive section 11b of the carriage 11. A guide bar 12 is inserted into a through hole 11c provided in the drive portion 11b of the carriage 11 described above. As a result, when the rotating shaft 23 of the step motor 20 rotates in the direction of arrow M1, the drive section 11b is pulled by the other end 26b of the steel belt 26, and the carriage 11.13 is moved in the direction of arrow C, that is, in the direction of the outer circumference of the disk.
When the rotating shaft 23 rotates in the direction of the arrow M2, the driving portion 11b is pulled by one end 26a of the steel belt 26, and the carriage 11.13 is moved in the direction of the arrow, that is, in the direction of the inner circumference of the disk. The distance traveled by the carriage 11, 13 is therefore equal to the rotational distance traveled by the outer periphery of the pulley 25 around which the steel belt 26 is wound.

The detection plate 24 is substantially fan-shaped, and its radius is, for example, twice the outer radius of the pulley 25. Carriage 11.1
3 in the direction of arrow C to a position where the detection plate 24 rotates when the magnetic head is at a position corresponding to track 00.
A photosensor 27 is provided, and this photosensor 27 is fixed to the mounting plate 22. The photosensor 27 emits a detection signal when the detection plate 24 blocks light.

FIG. 4 shows a block system diagram of an embodiment of a device using the method of the present invention. In the figure, 30 is CP, U, and this C
The PU 30 controls, for example, rotation control of a step motor, load/unload control of a magnetic head, disk write control, and solenoid plunger 6 in response to commands from a host computer (for example, a personal computer, a word processor, etc.) inputted through a terminal 31. It controls the entire disk drive, including drive control. Moreover, the detection signal of the photosensor 27 shown in FIGS. 3(A) and 3(B) is C
It is supplied to PU30. As will be described later, the CPLI 30 generates a drive control signal in response to a detection signal from the photosensor 27, and in response to this drive control signal, the drive circuit 32 supplies four-phase drive current to the step motor 20 to rotate it.

FIG. 5 shows a flowchart of one embodiment of the processing executed by the CPU 30. The process shown in FIG. 5 is executed when the power of the disk device is turned on and when initial setting of the head position is necessary.

First, in step 40, it is determined whether or not the 7-point sensor 27 is outputting a detection signal.

When the detection plate 24 blocks the light from the photosensor 27 and generates a detection signal, that is, the magnetic head located at the dashed line 2'1 of the carriage 11.13 corresponds to the outermost track (track 00) of the disk. When the step motor 20 is at the position where the carriage 11.
13 is moved by one step toward the inner circumference of the disk (step 41). These steps 40 and 41 are repeatedly executed until the generation of the detection signal from the photosensor 27 stops, that is, until the magnetic head moves to the inner circumferential side from the track OO of the disk. When the detection signal from the photosensor 27 disappears, step 40 Then, the process moves to step 42.

In step 42, the step motor 20 is rotated by one step in the direction of arrow M+force, and the carriages 11, 13 are moved in the direction of the inner circumference of the disk. After this, it is determined whether there is a detection signal from the photosensor 27 (step 43),
If the detection signal is generated, the process shown in FIG. 5 is ended.

Furthermore, when the power is turned on, if the magnetic head is located on the inner circumferential side of the disk than track 00, steps 42 and 43 are repeatedly executed through step 40, and the photosensor 27
The process shown in FIG. 5 ends when the detection signal is generated.

In this way, for example, even if the magnetic head is located on the outer side of the disk from track 00 when the power is turned on, the magnetic head is temporarily moved from track 00 to the inner side of the disk.
After this, the magnetic head is moved one step at a time in the direction of the outer circumference of the disk until a detection signal from the photosensor 27 is generated, so the stopper that was previously required can be removed, eliminating the need to adjust the mounting position of the stopper. .

Note that the photosensor 27 generates a detection signal only when the magnetic head is located closer to the inner circumference of the disk than track 00.
However, the present invention is not limited to the above embodiments.

Effects of the Invention As described above, in the head position initial setting method of the disk device according to the present invention, the determination means determines the presence or absence of a detection signal from the sensor, and the control means moves the magnetic head to the outermost periphery of the disk according to the determination result. Since the track and the outermost tracks are moved to the inner circumferential side and then moved from the inner circumferential side to the outermost track, there is no need for a stopper to restrict the movement of the carriage with the magnetic disk attached. It has the advantage that there is no need to adjust the mounting position of the stopper, which is a time-consuming process.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of the method of the present invention, FIG. 2 is a perspective view of an embodiment of a disk device to which the method of the present invention is applied, and FIG. 3 is a diagram of an embodiment of the mechanism used in the method of the present invention. A plan view, a sectional view, and FIG. 4 are block diagrams of an embodiment of an apparatus using the system of the present invention, and FIG. 5 is a flowchart of an embodiment of processing executed by the CPU shown in FIG. 11.13... Carriage, 11a... Magnetic head, 20... Step motor, 22... Mounting plate, 23
...Rotating shaft, 24...Detection plate, 25...Pulley,
26... Steel belt, 27... Photo sensor,
30... CPU131... Terminal, 32... Drive circuit, 40-43... Step.

Claims (1)

[Claims] In a head position initialization method for a disk device, in which a carriage is driven by a step motor to move in the radial direction of the disk, and a magnetic head attached to the carriage records and reproduces information on the disk, the magnetic head is located at the top of the disk. A sensor that detects a position corresponding to the outer circumferential track and a position on the outer circumferential side (or inner circumferential side) from the outer circumferential track, a discriminating means for discriminating the presence or absence of a detection signal from the sensor, and a discriminating result of the discriminating means. The outer circumferential track and the magnetic head on the outer circumferential side thereof are moved to the inner circumferential side, and the magnetic head on the inner circumferential side is moved to the outermost circumferential track. A head position initial setting method for a disk device characterized by: