JPH02148473A - Disk drive device - Google Patents

Abstract

PURPOSE:To execute the stable and satisfactory recording and reproducing of data by using an arm position sensor, seeking a track, using a servo signal on a disk, executing position servo and simultaneously separating seek operation. CONSTITUTION:An arm position sensor 10 generates a period signal with the move of a head arm 4. The servo signal is arranged in a sector shape on a disk 1. Then, a track pulse is obtained from a generating circuit 28 according to the signal of the arm position sensor 10 and a head arm moving speed signal is obtained from a converting circuit 25. By these signals, operation is executed to seek a head 3 to a track, which is a purpose. After that, the position servo is executed by using the servo signal and at the time of this position servo, the seek operation is separated by a switch 33. Thus, the stable and satisfactory recording and reproducing of the data can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk drive device such as a hard disk used as an external storage device for a computer.

[Summary of the invention]

The present invention relates to a disk drive device that is capable of extremely good data recording and reproduction by using an arm position sensor and a servo signal on the disk.

[Conventional technology]

Disk drive devices such as hard disks are used as external storage devices for computers.

[Inventiveness C: Problem to be solved] In such a device, data is recorded on tracks drawn in concentric circles on the disk, and a predetermined number of sectors are defined on these tracks, and recording is performed for each sector.・Playback is now started. When recording/reproducing data, a track designated by the computer is sought, and recording/reproduction is performed in the designated sector within the track.

However, when performing this track seek, conventionally, for example, when multiple disks are stacked, one side of any disk is designated as a signal surface exclusively for the servo, and the playback signal from this surface is used for track seek. method was being implemented. Therefore, in this method, one side of the disk is not used for recording and reproducing data, and the storage capacity is reduced by that amount, resulting in a total I! The amount of accommodation will be reduced.

On the other hand, in the conventional structure of tracks and sectors on a disk, for example, as shown in FIG.
Furthermore, the recording positions of sectors are arranged radially. Therefore, when performing the above-mentioned track seek, for example, 4-bit
Servo addresses of points (00 to 15) are repeatedly provided in sequence, and by making sure that the moving speed of the head during seek does not exceed 16 tracks per rotation angle of one sector, the servo addresses read intermittently It has been considered to detect a desired track from the position of movement of the head.

However, in the above-mentioned device, the recording surface of the disk is divided into a plurality of zones according to the radial position of the track, and the number of sectors provided on each track for each zone is determined so that the number of sectors is larger on the outer side and smaller on the inner side. Zone recording has been proposed to increase capacity, but if such zone recording were performed, the boundary positions of sectors in each zone would be uneven, making it impossible to perform the track seek using the servo address described above. .

This application was filed in view of these points.

[Means for Solving the Problem] The present invention has an arm position sensor (optical sensor θ0)) that generates a periodic signal as the head arm moves, and servo signals ( A) is provided at the arm position, and the track pulse (generation circuit (2B)) and head arm movement speed signal (conversion circuit (25)) are obtained from the signal of one sensor at the arm position, and these signals are used to determine the purpose of the head. This disk drive device performs a seek operation to a track, and then performs position servo using the servo signal, and disconnects the seek operation (switch (33)) during position servo.

[Effect]

According to this, the arm position sensor is used to seek the track, and the servo signal on the disk is used to perform position servo, and the seek operation is separated at this time, so that stable and good data can always be recorded. Can be played.

〔Example〕

In Fig. 1, (1) is a hard disk, and the recording surface of this disk (1) is divided into a plurality of zones depending on the radial position of the track, and the number of sectors provided on each track for each zone is determined by the outside. It is provided in such a way that the number of parts is large, and the number of parts is reduced on the inside.

Further, the disk (1) is rotated at high speed by a spindle (2). A head (3) is provided facing the recording surface of this disk (1), and this head (3) is attached to a helad arm (4), and the middle of this head arm (4) is a rotating shaft ( 5), and the other end is driven by a voice coil motor (6) to drive the head (
3) is moved to a desired position in the radial direction of the disk (1). Note that the voice coil motor (6) is attached to the case (shown - U).
It is composed of a stator portion (6a) such as a permanent magnet and a yoke fixedly arranged on the head arm (4), and a drive coil (6b) provided at the other end of the head arm (4).

Further, a second arm (7) is provided which is driven integrally with the Herad arm (4), and a scaler (8) for position detection is provided at the other end of this arm (7). Further, a circuit board (9) is provided which is fixedly arranged in a case etc., and this board (9) is provided.
9) Optical sensor θ0 at the position corresponding to the upper scaler (8)
will be provided. Sensor 00) and scaler (8)
As a result, a periodic signal, which will be described later, is formed as the head arm (4) moves.

A signal from the sensor 00) is then supplied to the control circuit (11) on the board (9). Further, a signal indicating the target track position from an external computer (not shown) or the like is supplied to the control circuit (11) on the circuit board (9) through the input/output cable (02). And this control port IP1 (11
) are supplied to the drive coil (6b) through the flexible cable plane.

Further, the signal reproduced by the head (3) is supplied to the circuit board (9) via the flexible cable.

In addition, an external computer, etc. is connected to the input/output cable 02).

The circuit board (9) is connected to the head (3) via a flexible cable 071), and signals from a computer or the like are recorded and reproduced on the hard disk (1).

In this device, from the optical sensor 00), the second
Corresponding to the position of the head (3) with respect to the track on the disk (as shown in the upper side of the figure), two systems of periodic signals as shown in A and B in the figure are independently taken out.Therefore, the head (3) By detecting the frequencies of these signals when the head (3) is moving, the speed of movement of the head (3) can be known, and by detecting the intersection between these signals and the center (0) level of the signal, the speed of the head (3) can be known. ) track crossings.

Therefore, Fig. 3 shows the control circuit (
11) shows an example configuration in which signals A and B from the optical sensor 00) are supplied to the terminals (21) and (22), respectively,
Signals from these terminals (21) and (22) pass through amplifiers (23) and (24), respectively, to a frequency-voltage conversion circuit (25) consisting of a capacitor, an amplifier, a multiplexer, etc.
). Furthermore, the signals from the amplifiers (23) and (24) are respectively shaped by comparators (26 and 27) and supplied to the multiplexer of the conversion circuit (25), and the signals from the comparator (27) are adjusted to the above-mentioned center level. is fed to a forming circuit (28) which detects the intersection of the lines and forms a track pulse indicative of track crossing.

Track pulses from this forming circuit (28) are supplied to a microcomputer (29), and by counting these pulses, the position of the track that the head (3) is in contact with is measured.

Therefore, in this configuration, when the control device (3o) instructs the microcomputer (29) to move the head (3) to an arbitrary track, the microcomputer (29) tells the microcomputer (29) that the head (3) is currently facing the track. A control signal (speed control signal) for moving the head (3) between the current track and the target track is formed,
The value is output as a digital value.

This signal is supplied to the summing amplifier (32) through the DA conversion circuit (31). - A voltage value corresponding to the frequency of the signals A and B, that is, the moving speed of the head (3) is taken out from the force conversion circuit (25), and this signal is supplied to the summing amplifier (32). And this summing amplifier (
32) is supplied to the drive amplifier (34) of the voice coil motor (6) via the switch (33),
The head (3) is moved to the designated track.

That is, the microcomputer (29) outputs a speed control signal as shown by the broken line a in FIG. 4A, for example.
In contrast, the speed of the actual head (3) is changed as shown by the curve in the figure, and the head (3) is moved to the designated track. Note that FIG. 1B shows the state of the track pulse during that time.

In this way, a so-called seek operation is performed.

Furthermore, in the above configuration, position servo control is performed after the seek operation.

That is, in the above configuration, the switch (33) is switched after the seek operation. On the other hand, a reproduced signal from the head (3) is supplied to a terminal (35), and a signal from this terminal (35) is supplied to a head amplifier (36). If a plurality of disks (1) are stacked and used, the amplifier (36) is switched by a signal corresponding to the desired recording surface from the microcomputer (29) and the corresponding head (3) is used. ) is selected. A signal from this amplifier (36) is supplied to a servo signal reproducing circuit (3B) through an AGC amplifier (37), and is also supplied to a servo signal detection and sample-and-hold signal starting circuit (39).

In this apparatus, a so-called tri-bit servo signal pattern as shown in FIG. 5A is recorded for each sector on the disk (1). Therefore, for example, when the head (3) is located at position
The circuit (39) sends a detection signal as shown in Fig.
), this signal is supplied to a reproducing circuit (38), the level of the upward pulse is detected, and the difference is extracted. As a result, a differential output is extracted as shown in the figure according to the position of the head (3), and the deviation of the head (3) from the track is detected. Note that this detection signal is intermittently extracted for each sector, for example. This signal is then supplied to a sample and hold circuit (MBC40), for example at the position of the third downward pulse, by supplying a sample and hold signal from the circuit (39) to form a continuous position signal.

This signal is fed directly and via impark (41) to switch (42). This switch (42) is controlled by a signal from the microcomputer (29) so that the polarity of the position signal for each track is constant. A signal from this switch (42) is supplied to a summing amplifier (43). Further, a signal corresponding to an arbitrary center level is transmitted from the microcomputer (29) through the DA conversion circuit (31) to the summing amplifier (43).
) to form a position servo control signal for the displacement of the head (3).

This signal is supplied to the changeover switch (47) through an integrator circuit (44a), a secondary filter (45a) that lowers the gain of the mechanical resonance frequency, and a phase compensation circuit (46a).
This switch (47) is the microphone 17 computer (29)
), and the extracted signal is sent to the switch (33).
is supplied to

When zone recording is performed as described above, and the number of sectors is different for each zone and the signal transmission rate is different, in order to optimize the phase characteristics etc. for each zone, Correspondingly, a plurality of integrating circuits (14b), secondary filters (45b), phase compensation circuits (46b), etc. are provided, and a switch (47) is used to adjust the zone corresponding to the zone containing the target tone. A characteristic circuit is selected.

As a result, a seek operation of the head (3) and subsequent servoing of the head position are performed toward an arbitrary track instructed by the control device (30).

In this way, according to the above-mentioned device, the arm position sensor is used to seek the track, and the servo signal on the disk is used to perform position servo, and at this time, the seek operation is turned off and on, so that it is always stable. Moreover, it is possible to perform good data recording and reproduction.

In the above-mentioned apparatus, an optical means using a scaler (8) and an optical sensor 00) is used as an external position sensor, but this may be an electromagnetic means using a so-called [fi scale magnetic sensor].

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an example of the present invention, FIGS. 2 to 5 are diagrams for explaining the same, and FIG. 6 is a diagram for explaining a conventional technique. (+) is the disk, (2) is the spindle, (3) is the head, (4) is the helad arm, (5) is the rotation axis, (6) is the voice coil motor, (the force is from the second arm, ( 8) is a scaler, (9) is a circuit board, 00) is an optical sensor, (11)
) is a control circuit, 02) is an input/output cable, and θ3) is a flexible cable. [Effects of the Invention] According to the present invention, the arm position sensor is used to seek l/rack, the servo signal on the disk is used to perform position servo, and the seek operation is separated at this time, so that the Stable and good data recording
Playback is now possible.

Claims (1)

[Claims] The head arm has an arm position sensor that generates a periodic signal as the head arm moves, and servo signals arranged in sectors on the disk are provided, and track pulses and track pulses are generated from the signal of the arm position sensor. A disk drive that obtains a head arm movement speed signal, uses these signals to perform a seek operation of the head to a target track, and then performs position servo using the above servo signal, and separates the above seek operation when position servo is performed. Device.