JP2572395B2 - Disk drive device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device for recording or reproducing information by bringing a recording or reproducing head into sliding contact with a disk-shaped rotary recording medium.

2. Description of the Related Art As a disk drive of this type, for example, a floppy disk drive for recording or reproducing information on a magnetic sheet as a flexible rotating magnetic recording medium, a so-called floppy disk, by a magnetic head as a recording or reproducing head. (Hereinafter referred to as FDD) is widely used as an external storage device of a computer system.

The FDD has a rotation drive mechanism composed of a media drive motor that rotates a magnetic sheet (hereinafter referred to as a medium) as a rotary recording medium, and a magnetic head moving mechanism that moves the magnetic head close to and into contact with the medium. A head loading mechanism for performing so-called unloading, ie, separating from the so-called load and the medium, and a head seek mechanism for moving the magnetic head in both directions along the radial direction of the medium are provided.

Then, the medium is rotated by the drive of the medium drive motor, the magnetic head is loaded on the medium by the drive of the head loading mechanism, brought into sliding contact, and the magnetic head is moved to an arbitrary track position on the medium by the drive of the head seek mechanism. Then, information is recorded and reproduced on the track.

[Problems to be Solved by the Invention] The medium sliding surface of the magnetic head is formed as a very smooth mirror surface. Therefore, if the medium is not driven to rotate and is brought into contact with the magnetic head, the magnetic head and the medium may be adsorbed via a lubricant for smoothing the rotation of the medium. And when this adsorption occurs, the rotation of the media becomes impossible,
The recording / reproducing operation of the FDD is disabled, and the operation of the host using the FDD is also disabled. Further, if the motor is continuously excited to drive the medium in the suction state, an excessive force may be applied to the medium and the magnetic head may be damaged.

In the conventional FDD, as a method of eliminating this adsorption, for example, the medium drive motor is rotated forward and reverse, thereby
A method has been proposed in which the suction is eliminated by the impact generated in the media holding unit in the area D. However, this method is not particularly effective.

[Means for Solving the Problems] In the present invention, in order to solve the above-mentioned problems, in a disk drive device for recording or reproducing information by sliding a recording or reproducing head on a disk-shaped rotary recording medium, A motor that operates according to a motor rotation command to rotate the medium, a head that performs recording or reproduction by sliding on the medium that is rotated by the motor, and performs recording or reproduction by moving the head with respect to the medium A head moving mechanism for displacing the position, a loading detection unit for detecting the filling of the medium, a rotation detection unit for detecting a rotation state of the medium, and a rotation detection unit based on detection results of the loading detection unit and the rotation detection unit. Suction detection means for detecting suction between a medium and the head, and the medium and the head by the suction detection means. When the suction is detected, the head moving mechanism is operated to cause the head to vibrate or move with respect to the medium. Or control means for ending the movement and stopping the driving of the motor or discharging the medium.

[Operation] According to such a configuration, when the suction detection unit detects suction between the medium and the head based on the detection result of the loading of the medium by the loading detection unit and the detection result of the rotation state of the medium by the rotation detection unit, Since the control means operates the head moving mechanism and causes the head to vibrate or move with respect to the medium,
Adsorption is reliably eliminated. In addition, if the suction is not eliminated even after the vibration or movement of the head, the vibration or movement of the head is terminated, the driving of the motor for rotating the medium is stopped, or the medium is discharged. Unreasonable force is not applied, and damage to both by the unreasonable force can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 illustrates the overall configuration of an FDD according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a control circuit for controlling the entire FDD. The control circuit 1 includes a microprocessor 2 serving as a main control unit, a ROM 3 storing a control program and fixed data necessary for the control, a RAM 4 used for data processing, and an input / output port 5 serving as an interface with the outside. It is composed of The microprocessor 2 is connected to the input / output port 5 via a driver group (not shown).
Various sensors and detection units of the FDD are connected to each mechanism, and are controlled by the microprocessor 2.

As the FDD detection unit, a rotation detection unit 6 that detects whether the medium is rotating or not and generates a medium rotation detection signal is provided. The rotation detector 6 is configured as, for example, an index detector that detects an index hole with a photocoupler, or as a frequency signal generator attached to a medium drive motor 11 that drives the medium to rotate.

In addition, a media detection unit 7 that detects whether or not the media is loaded with the FDD and generates a media detection signal is provided as a detection unit. Illustration and description of other detection units and various sensors are omitted.

On the other hand, as each mechanism of the FDD, first, as described above, the magnetic head is moved in both directions along the radial direction of the medium (the outer circumferential direction,
A head seek mechanism 9 that moves in the inner circumferential direction) is provided. Further, a head loading mechanism 10 for loading and unloading the magnetic head onto and from the medium is provided. Further, a rotation drive mechanism that is configured by the medium drive motor 11 and that rotates the medium is provided.

Further, in this embodiment, a media ejection mechanism 12 is provided for automatically ejecting the media from the FDD under the control of the microprocessor 2 instead of manually. In addition to this, the FDD of the present embodiment is provided with other mechanisms provided in a normal FDD, but illustration and description thereof are omitted.

By the way, in this embodiment, when the magnetic head and the medium are attracted as described later, an operation for eliminating the attracting is performed. If the suction is not canceled even after performing the operation for canceling the predetermined amount, the operation for protecting the magnetic head and the medium is selected and performed from a plurality of types. In order to select this protection operation, in this embodiment, a protection operation selection unit 8 is provided in addition to the above configuration, and is connected to the microprocessor 2 via the input / output port 5. The selector 8 is composed of, for example, a group of changeover switches that are manually operated, and the type of protection operation is selected by the microprocessor 2 in accordance with ON / OFF of individual switches set in advance.

Based on the above-described configuration, the microprocessor 2 responds to commands and data input from a host system (not shown), according to a control program stored in the ROM 3, and responds to inputs from each sensor and detection unit. To 12 and so on to perform the recording / reproducing operation as a whole. That is,
The medium drive motor 11 is driven by a motor rotation command to rotate the medium, the head load command causes the head load mechanism 10 to load the magnetic head onto the medium, and further issues a head seek command to the head seek mechanism 9. To move the magnetic head to a target track position on the medium, and to record and reproduce information on the track. Further, after the recording and the reproduction are completed, a media ejection command is issued to the media ejection mechanism 12 as necessary, so that the media is ejected.

In this embodiment, as a point related to the present invention, the microprocessor 2 detects whether or not the magnetic head and the medium have been attracted at an appropriate timing during a normal processing operation. A process for causing an operation for cancellation is performed. If the suction is not canceled even after performing the operation for canceling the suction by a predetermined amount, a process for protecting the medium and the magnetic head is performed.

The details of this processing are performed as follows in the procedure shown in FIG.

That is, the microprocessor 2 performs the steps shown in FIG.
At an appropriate timing during the normal processing operation shown in S1, the process shifts to step S2 to detect whether or not the magnetic head and the medium are attracted. Here, for example, when a media detection signal is input from the media detection unit 7 in FIG. 1 and a media rotation detection signal is not input from the rotation detection unit 6 even though a motor rotation command is issued to the media drive motor 11 Is detected as having caused the above-mentioned adsorption. Then, when the suction is not detected, the process returns to the normal processing operation of step S1, and when the suction is detected, the process proceeds to step S3.

In step S3, the magnetic head is vibrated by driving the head seek mechanism 9 to alternately move the magnetic head by a small amount in both the radially inner and outer circumferential directions of the medium. This is performed for a predetermined time.

Next, in step S4, it is detected whether or not the magnetic head and the medium are attracted. That is, it is checked whether or not the adsorption has been canceled. If the suction has been eliminated, the operation returns to the normal processing operation of the switch S1.
Proceed to S5.

In step S5, the head loading mechanism 10 is driven, and the magnetic head is unloaded once and then loaded again. This is performed once or a predetermined number of times.

Next, in step S6, it is checked whether or not the suction between the head and the medium has been eliminated. If it has been resolved, the process returns to the normal processing operation in step S1, and if it has not been resolved, the process proceeds to step S7 and subsequent steps.

In steps S7 to S12, the microprocessor 2 selects one of the operation of stopping the drive of the medium drive motor 11, the unloading of the magnetic head, and the ejection of the medium as operations for protecting the magnetic head and the medium. This selection is made according to the setting made in advance by the protection operation selection unit 8 as described above. That is, the microprocessor 2 refers to the input from the protection operation selection unit 8, checks in step S7 whether or not to stop the media drive motor, and if it is designated, stops the motor 11 in step S8. Do. In step S9, it is checked whether or not unloading of the magnetic head is specified. If so, the head is unloaded in step S10. In step S11, it is checked whether or not the ejection of the medium has been designated. If the ejection has been designated, the medium is ejected by the medium ejection mechanism 12 in step S12.

Next, the microprocessor 2 checks in step S13 whether or not the medium has been replaced. If not, the microprocessor 2 waits for replacement. That is, the operation of the FDD is prohibited until the medium is replaced. Although not shown in FIG. 2, an alarm for urging the user of the FDD to replace the medium is output by a buzzer (not shown) or the like. And when the media is changed, step
It returns to the normal processing operation of S1.

As described above, in the present embodiment, if the magnetic head and the medium are attracted, it is immediately detected, and the vibration or unloading / loading operation of the magnetic head almost completely eliminates the attracting. Immediately restored to a possible state. In particular, according to the unloading and loading operations of the magnetic head, the magnetic head is always separated from the medium at least once, so that the suction can be eliminated quite certainly.
Thus, the adsorption can be almost certainly eliminated, and the reliability and work efficiency of the FDD can be improved.

Further, according to the present embodiment, if the suction is not canceled even after performing the operation for canceling the suction by a predetermined amount, one of the stop of the medium drive motor 11, the unloading of the magnetic head, and the ejection of the medium is performed. Since both operations are performed, the magnetic head and the medium can be reliably protected from damage without applying excessive force.

In the above-described embodiment, the vibration of the magnetic head by the head seek mechanism 9 and the unloading and loading of the magnetic head by the head loading mechanism 10 are performed in order to eliminate the suction between the magnetic head and the medium. It may be just.

As another method for eliminating the above-mentioned suction, an automatic loading mechanism for automatically mounting (loading) the medium at the mounting position and releasing (unloading) the medium in the FDD is provided, and the mechanism is used to unload the medium. It is possible to realize a configuration in which the adsorption is eliminated by performing the loading.

Further, in the configuration of the control system of the above embodiment shown in FIG. 1, the control circuit 1 may be composed of a discrete element.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a disk drive device for recording or reproducing information by sliding a recording or reproducing head on a disk-shaped rotary recording medium, loading of the medium is performed. Then, the suction between the medium and the head is detected based on the detection result of the rotation state, and when the suction is detected, the head is vibrated or moved with respect to the medium, so that if the suction occurs, the suction is quickly and reliably eliminated. be able to. Also, if the suction is not eliminated even after the head is vibrated or moved, the head is vibrated or moved, the motor for rotating the medium is stopped, or the medium is ejected. No excessive force is applied, and damage to both can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the structure of the entire control system of the FDD according to the embodiment of the present invention, and FIG. 2 is a flow chart showing the procedure of a suction elimination process performed by the microprocessor in FIG. DESCRIPTION OF SYMBOLS 1 ... Control circuit, 2 ... Microprocessor 3 ... ROM, 4 ... RAM 5 ... I / O port, 6 ... Rotation detection part 7 ... Media detection part, 8 ... Protection operation selection part 9 ... Head seek mechanism 10 Head loading mechanism 11 Media drive motor 12 Media ejection mechanism

Claims (1)

(57) [Claims] 1. A disk drive device for recording or reproducing information by bringing a recording or reproducing head into sliding contact with a disk-shaped rotary recording medium, comprising: a motor that operates according to a motor rotation command to rotate the medium; A head that performs recording or reproduction by slidingly contacting the medium to be rotated; a head moving mechanism that displaces a recording or reproduction position by moving the head with respect to the medium; and a loading detection that detects filling of the medium. Means, rotation detection means for detecting a rotation state of the medium, suction detection means for detecting suction between the medium and the head based on detection results of the loading detection means and the rotation detection means, and the suction detection If the suction of the medium and the head is detected by the means, the head moving mechanism is operated to operate the head. When the head is vibrated or moved with respect to the medium, and the vibration or movement does not eliminate the suction, the vibration or movement is terminated and the drive of the motor is stopped or the medium is discharged. A disk drive device, comprising: control means.