JP2679584B2 - Disk device head retractor - 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 withdrawal device for a hard disk device, and more particularly to a head withdrawal device for preventing the destruction of the disk disk of a hard disk device used by connecting to a personal computer, a portable computer or the like.

[0002]

2. Description of the Related Art A conventional head retracting device of this type has a structure shown in FIG. This retractor was disclosed in an article entitled "Lamp Loading Method" of Nikkei Electronics No. 2-17, 1992. (B) is a perspective view thereof, and (A) is an example of its operation (side view). ) Is shown.

Heads 81 are provided so as to face the recording surfaces (upper and lower) of the recording disk board 83, respectively.
1 is supported by a head arm 85. And
A rod 82 is attached to the head arm 85, and the tip end portion of the rod protruding from the arm is engageable with the ramp surface (inclined surface) of the cam 84.

When the disk device becomes inoperative, the head arm 85 moves in the outer peripheral direction of the disk 83, and along with this movement, the protruding tip end portion of the rod 82 engages with the ramp surface of the cam 84, and the ramp surface thereof is engaged. Move along. Since the ramp surface is shaped so that the head 81 is separated from the recording surface as the rod 82 moves, the head 8 moves as the head arm 85 moves to the outer circumference of the disk.
1 is withdrawn from the disk 83.

As described above, when the hard disk device shifts from the operating state to the non-operating state, the head 81 is lifted from the disk recording surface and retracted to the outside of the disk, so that the head 81 hits the disk plate 83 to destroy data. Is preventing.

[0006]

In such a conventional head retracting device for a hard disk device, the head is retracted only when the disk device is not operating, so it is possible to drop the disk device during operation. If a large external force (impact force) is applied to the disk device, the data destruction due to the head hitting the disk disk cannot be avoided.

An object of the present invention is to provide a head retraction device for a disk device which prevents data destruction due to collision of the head with the disk when a large impact force is applied during a write operation or a read operation. .

[0008]

A head retractor for a disk device according to the present invention comprises a sensor for detecting an impact force in a direction perpendicular to a recording surface of the recording disk, and the head in response to a detection output of the sensor. A retracting control means for retracting the recording surface from the recording surface, and the retracting control means.
Position of the head on the recording surface when the head is retracted.
Head position storage means for storing the position, and a single unit on the recording surface.
Memory means for temporarily storing the write data and the head
If the detection output from the sensor is absent after avoiding
The head to the position at the time of retraction with reference to the head position storage means.
Unit writing temporarily stored in the memory means
Control means for controlling to write only data .

Further, the head retracting device according to the present invention is as described above.
The control means further returns the head to the retracted position.
At the same time, the unit read data is stored in the memory means.
It is characterized in that it is controlled so as to be remembered at a time .

[0010]

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 shows a specific example of a head floating / lowering device,
(A) is a side view and (B) is a plan view.

Data read / write from / to the recording disk 21 is always performed via the memory circuit 4. It is assumed that the capacity of this memory is one sector which is the minimum read / write unit, and the write data from the system (not shown) is first written to the memory circuit 4 for one sector, and then the head 6 is written to the disk 21. Written through.

Further, even when reading, the disk 21
The read data from the head 6 is written to the memory circuit 4 for one sector and then delivered to the system side as read data.

By doing so, it is possible to prevent data destruction even if the head is retracted during reading or writing.

The head position recording circuit 3 always manages the position on the recording surface of the head 6 and stores the head position information, which is stored by the controller 1 when the head retraction is released. It is referred to and is used to return the head to the position on the recording surface immediately before the head is retracted.

The vibration detecting sensor 2 detects an impact force in a direction perpendicular to the recording surface of the disc 21.
When a large acceleration is applied such that the head 6 hits the disk 21 and destroys the data on the disk, this is detected and transmitted to the controller 1. Therefore, as the sensor 2, a semiconductor acceleration sensor or the like is used, and the sensor 2 is mounted near the disk board or in the head arm portion.

The head floating / lowering device 5 is shown in FIG.
As shown in (B), it comprises a head floating plate 24 and a drive motor 28 for rotationally driving the head floating plate 24 (in the direction of arrow a in FIG. 2B). The head levitation plate 24 is provided with a ramp portion that engages with the protruding tip portion of the load 23 attached to the head, as shown in FIG.
As shown in (C), when the head floating plate 24 moves in the direction of arrow a, the protruding tip end of the load 23 engages with the ramp portion, and when the head floating plate 24 moves further, the head 6 is separated from the recording surface. Will be done. This allows the head to be retracted.

The head withdrawal is released by driving the head floating plate 24 in the direction opposite to the direction a to return the head 6 onto the disk board 21.

The controller 1 has a function of controlling the operation of each of the above parts, and performs control in accordance with the operation flows of FIGS.

The operation during data write is shown in FIGS.
This will be described with reference to FIG. When writing data, write data for one sector is written to the memory circuit 4 (step). Then, the data for one sector in this memory circuit is written to the disk via the head 6 (step).

When all the write data for one sector is written, the next data for one sector is stepped.
Performs the same processing as.

In any of the above procedures,
When a detection signal is generated from the vibration sensor 2, the process immediately shifts to the process of FIG. 5 and the head is retracted. If the head is retracted when the data is written to the disk in the middle of one sector (state of step in FIG. 4), after confirming that there is no detection signal from the sensor 2, the head is not being written. Return to the start position of the sector, and write from that sector is started.

Since this sector position is temporarily stored in the head position recording circuit 3, the controller 1 refers to this recording circuit 3 to perform head recovery. Since the write data for the sector is stored in the memory circuit 4, this stored data is used.

When the head is retracted in a state other than the step shown in FIG. 4, processing can be performed up to at least the retract release position α shown in the flow chart of FIG. 4 (because the head does not contact the disk). Processing proceeds to that point. Then, the head position recording circuit 3 is referred to, the head is returned to the original position, and the process is started again from the step of FIG.

In the flow chart of FIG. 5, it is possible to judge whether the state before the saving is or not, by the controller 1 monitoring the read address of the memory circuit 4.

The operation during data read is shown in FIGS.
This will be described with reference to FIG. When reading data, the head 6 reads and writes one sector of data from the disk to the memory circuit 4 (step). Then, the data for one sector in the memory circuit 41 is passed to the system as read data (step).

When all the read data for one sector has been read out and passed to the system, the same process as step is performed for the next data for one sector.

In any of the above procedures,
When a detection signal is generated from the vibration sensor 2, the process immediately shifts to the process of FIG. 7 and the head is retracted. A state in which data is read from the disc to the middle of one sector (see FIG. 6).
If there is a head retreat in step 1), after confirming that there is no detection signal from the sensor 2, return the head to the head position of the sector that was in the middle of reading, and start reading from that sector. To do.

Since this sensor position is temporarily stored in the head position recording circuit 3, the controller 1 refers to the recording circuit 3 to perform head return. At this time, the data in the middle of reading stored in the memory circuit 4 is erased by overwriting.

When the head is retracted in a state other than the step of FIG. 6, at least the retract release position β in the flow of FIG. 6 can be processed (because the head does not contact the disk). Processing proceeds to that point. Then, the head is returned to the original position by referring to the head position recording circuit 3, and the process is started again from the step of FIG.

In the flow of FIG. 6 in this case, the control 1 can judge whether the state before the saving is other than that by monitoring the write address of the memory circuit 4.

As described above, during the operation of the disk, the sensor 2 constantly detects the acceleration in the direction perpendicular to the recording surface of the hard disk board 21.
The data is prevented from being destroyed due to contact with the head caused by vibration or the like by separating the head from the disk surface when a large acceleration is applied.

[0034]

As described above, according to the present invention, when a shock is applied to the disk device during the disk operation, the shock is detected and the head is retracted away from the recording surface. There is an effect that it is possible to prevent the data destruction caused by hitting the disc board and improve the reliability against the vibration of the disc.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2A is a side view of a head flying / lowering device of an embodiment of the present invention, and FIG. 2B is a plan view thereof.

FIG. 3 is a diagram showing an operation example of the head flying / lowering device of FIG.

FIG. 4 is an operation flow chart at the time of data writing according to the embodiment of this invention.

5 is an operation flow chart at the time of releasing the head retraction during the data write of FIG. 4;

FIG. 6 is an operation flow chart at the time of reading data according to the embodiment of this invention.

FIG. 7 is an operation flow chart at the time of releasing the head retract during the data read of FIG. 6;

FIG. 8 is a diagram showing a conventional head retractor, (A)
Is a side view and (B) is a perspective view.

[Explanation of symbols]

 1 Controller 2 Vibration Sensing Sensor 3 Head Position Recording Circuit 4 Memory Circuit 5 Head Ascending / Descent Device 6 Head 21 Disk Board 23 Rod 24 Head Floating Plate 25, 26 Stopper 27 Disk Disk Rotating Motor 28 Head Floating Plate Driving Motor

Claims (2)

(57) [Claims] 1. A head retracting device in a recording disk device, comprising: a sensor for detecting an impact force in a direction perpendicular to a recording surface of the recording disk; and a head for moving the recording surface in response to a detection output of the sensor. And a head retreat by the retreat control means.
Stores the position of the head on the recording surface when retracting
Head position storage means and unit writing data on the recording surface.
Memory means for temporarily storing the data, and
When there is no detection output from the sensor
Refer to the memory and return the head to the retracted position.
The unit write data temporarily stored in the memory means
A head retracting device for a disk device, comprising: a control unit for controlling writing . 2. The control means further comprises a position for the evacuation.
The head is returned to the storage unit and at the
2. The head retraction device for a disk device according to claim 1, wherein the head retraction device is controlled to temporarily store the read data .