JPH11250598A - Recording and reproducing device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording/reproducing device which can return a magnetic head positioned at a region having no position information to a desired position. SOLUTION: A control section 9 has a position detecting function obtaining a sine wave signal of one period in accordance with movement quantity of 1 data track of a magnetic head 10, a detecting function detecting significant top value and bottom value out of top values and bottom values accumulated in a storage section 25, an absolute position detecting function detecting an absolute position of a magnetic head 10 at the prescribed position when the magnetic head 10 is moved over a whole range including a data track region. And the magnetic head 10 is moved over a whole range including a data track region, and significant top value and bottom value being nearest to the present position of the magnetic head are detected based on an absolute position obtained by the absolute position detecting function of the control section 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a recording / reproducing apparatus and method for recording / reproducing an information signal on / from a recording medium.

[0002]

2. Description of the Related Art Conventionally, a recording medium such as a flexible disk has a recording capacity of about 1.
A medium of 44 megabytes (hereinafter referred to as a lower-order recording medium) is widely used. As a recording / reproducing apparatus for recording / reproducing an information signal to / from this lower recording medium, a specification for performing recording / reproduction by rotating the recording medium at a rotation speed of about 300 to 600 rpm (hereinafter, referred to as a lower recording medium) A recording / reproducing apparatus of the specification).

In the recording / reproducing apparatus of the lower specification, conventionally, the magnetic head is moved to a desired data track by moving means driven by a stepping motor. The lower specification recording / reproducing device, specifically,
The magnetic head is moved stepwise in the radial direction of the recording medium by a stepping motor to position the magnetic head on each data track, and recording / reproducing of information signals is performed on the data track on which the magnetic head is moved. I was This lower specification recording / reproducing apparatus detects the position of the data track where the magnetic head is located, for example, by the number of pulses or the rotation angle supplied to the stepping motor.

On the other hand, in recent years, the recording density has been made higher than that of the above-described lower recording medium by narrowing the track and the like, and the recording capacity at the time of formatting is 150 to 650 megabytes (hereinafter referred to as the upper recording medium). .) Has been proposed. As a recording / reproducing apparatus for recording / reproducing an information signal with respect to this upper recording medium, about 1200
There is a specification in which recording / reproduction is performed by rotating a recording medium at a rotation speed of about 3600 rpm to improve the recording density and the data transfer rate (hereinafter, referred to as a higher specification recording / reproduction device).

[0005]

Incidentally, position information indicating the position of each data track is stored in the above-mentioned upper recording medium. Then, the recording / reproducing apparatus of the upper specification detects the position information and positions the magnetic head on each data track. In a recording / reproducing apparatus of a higher specification, a magnetic head is continuously moved in a radial direction of a recording medium by using a voice coil motor which is a linear motor. For example, the voice coil motor is superior to the above-described stepping motor in that the driving power is reduced and the magnetic head is fed at a high speed. In the recording / reproducing apparatus of the higher specification, the recording / reproduction is performed by detecting the position information stored in the higher recording medium and positioning the magnetic head on the target data track by the voice coil motor.

However, some recording media do not have positional information on data tracks, for example, the lower-order recording media described above. In this case, as described above, an attempt is made to track the magnetic head by the voice coil motor as described above. However, since the current position of the magnetic head cannot be confirmed, the magnetic head cannot be moved to a desired data track. For example, in recent years, a recording / reproducing apparatus capable of recording / reproducing information signals on both a lower recording medium and an upper recording medium has been developed.
Therefore, when recording / reproducing an information signal on both the upper recording medium and the lower recording medium by the recording / reproducing apparatus in which the drive unit of the magnetic head is constituted by the voice coil motor as described above, the lower recording medium is used. However, there arises a problem that the magnetic head cannot be sent to a desired data track.

Here, when a recording medium which does not store the data track position information is mounted, information indicating the position of the magnetic head may be generated in advance in correspondence with the data track of the recording medium. ing. For example, in this case, it is conceivable to scan the magnetic head in advance over the entire data track area and create position information corresponding to each data track. In such a case, after the position information is created, that is, after the magnetic head scans the data track area, the magnetic head is positioned outside the data track area. However, since the purpose is to create position information corresponding to the data tracks in the data track area, no position information outside the data track area is originally created. Therefore, when the magnetic head is located outside the data track area, the magnetic head may not be able to operate normally because there is no position information corresponding to the current position. For example, it may not be possible to start track servo. This makes it impossible to perform subsequent processing such as recording / reproduction by the magnetic head.

Therefore, the present invention has been proposed in view of the above-described circumstances, and even when a magnetic head is located in an area where there is no positional information, the magnetic head is moved to a desired position. It is an object of the present invention to provide a recording / reproducing apparatus and method capable of returning.

[0009]

In order to solve the above-mentioned problems, a recording bond difference apparatus according to the present invention has a position detecting means for obtaining a signal corresponding to a track movement amount of a recording / reproducing head, and a position detecting means. Means for storing the top value and the bottom value in one cycle of the sine wave signal obtained by the means.
Storage means for accumulating each top value and bottom value in the track movement detection signal obtained by the reproduction head passing through the data track area by the head driving means; and among the top value and bottom value accumulated in the storage means, Detecting means for detecting a significant top value and bottom value; and detecting an absolute position of the recording / reproducing head at a predetermined position when the recording / reproducing head is moved over the entire range including the data track area by the head driving means. An absolute position detecting means. Then, the recording / reproducing apparatus moves the recording / reproducing head over the entire range including the data track area, and based on the absolute position obtained by the absolute position detecting means, the significant top closest to the current position of the recording / reproducing head. Value and bottom value are detected.

That is, the recording / reproducing apparatus obtains the track movement detection signal generated by passing the data track area by the position detection means, and stores the top value and the bottom value in the track movement detection signal. And the detecting means detects a significant top value and a bottom value among the top values and the bottom values accumulated in the storing means. Then, the recording / reproducing apparatus detects a significant top value and a bottom value closest to the current position of the recording / reproducing head by the absolute position detecting means.

Thus, the recording / reproducing apparatus can start track servo and the like even when the recording / reproducing head is positioned outside the data track area.

In order to solve the above-mentioned problems, the recording / reproducing method according to the present invention obtains a signal corresponding to a track movement of a recording / reproducing head and stores a top value and a bottom value in the signal. Storing a top value and a bottom value in a track movement detection signal obtained when the recording / reproducing head passes through the data track area; and storing the top value and the bottom value stored in the storage step. Detecting a significant top value and a bottom value among the values, and detecting an absolute position of the recording / reproducing head at a predetermined position when the recording / reproducing head is moved over the entire range. And In the recording / reproducing method, the recording / reproducing head is moved over the entire range including the data track area,
Recording based on the absolute position obtained in the absolute position detection process /
The significant top value and bottom value closest to the current position of the reproducing head are detected.

Thus, in the recording / reproducing method, even when the recording / reproducing head is positioned outside the data track area, track servo or the like can be started.

[0014]

Embodiments of a recording / reproducing apparatus according to the present invention will be described below with reference to the drawings.
In this embodiment, a flexible disk (hereinafter referred to as a lower disk) having a predetermined track pitch and a recording capacity at the time of formatting of about 1.44 megabytes, and a track narrower than the predetermined track pitch of the lower disk The recording / reproduction of information signals is performed on both a flexible disk (hereinafter, referred to as an upper disk) having a higher recording density than that of the lower disk and a recording capacity of 150 to 650 megabytes at the time of formatting. It is a recording / reproducing device that can be performed. Then, this recording / reproducing apparatus, for the lower disk described above,
It is driven to rotate at a rotation speed of about 300 to 600 rpm, and about 1200 to 36
The information signal is recorded / reproduced by being rotationally driven at a rotational speed of about 00 rpm. In the following description, when both the lower disk and the upper disk are collectively referred to, they are simply referred to as magnetic disks.

As shown in FIGS. 1 and 2, the recording / reproducing apparatus is a magnetic disk 20 having a plurality of data tracks formed concentrically so that each data track is substantially parallel.
0 for recording / reproducing information signals
0, a magnetic head driving unit 6 for moving the magnetic head 10 in a direction perpendicular to a plurality of data tracks of the magnetic disk 200, that is, a disk radial direction, and one cycle obtained by a position detecting function of a control unit 9 described later. The top value and the bottom value in the minute sine wave signal are stored, and each top value in the continuous sine wave signal obtained by passing the magnetic head 10 through the data track area by the magnetic head driving unit 6 is stored. And a storage unit 25 as storage means for storing the bottom value. And the recording / reproducing device 1
Has a control unit 9 for controlling each unit and each circuit.

The control unit 9 specifically has a position detecting function of obtaining a sine wave signal for one cycle in accordance with the movement amount of one data track of the magnetic head 10, and the control unit 9 stores the signal in the storage unit 25. A top and bottom value detection function for detecting significant top and bottom values among the top and bottom values, and when the magnetic head 10 is moved by the magnetic head driving unit 6 over the entire range including the data track area. And has an absolute position detecting function of detecting the absolute position of the magnetic head 10 at a predetermined position in.

The recording / reproducing apparatus 1 moves the magnetic head 10 over the entire range including the data track area, and based on the absolute position obtained by the absolute position detecting function of the control section 9, the current position of the magnetic head 10 , The significant top value and bottom value closest to are detected.

As shown in FIG. 1, the recording / reproducing apparatus 1 includes a disk support 3 for rotatably supporting a magnetic disk 200, a disk drive 4 for driving the disk support 3, and a magnetic disk. A magnetic head unit 5 for positioning the magnetic head 10 on a predetermined data track 200, a tracking control unit 7 for controlling the tracking of the magnetic head unit 5 with respect to the magnetic disk 200, and recording on the magnetic disk 200 by the magnetic head unit 5. A recording / reproducing unit 8 for performing / reproducing, a discriminating unit 2 for controlling the disk support unit 3 according to the type of the magnetic disk 200 mounted on the disk support unit 3, and an interface with an external computer (not shown). An external computer interface 100 is provided.

Hereinafter, each unit and each circuit of the recording / reproducing apparatus 1 will be described in detail.

The disk support 3 comprises, for example, a spindle motor or the like, and is a magnetic disk 2 which is detachably mounted.
00 is rotatably supported. The disk support unit 3 drives the magnetic disk 200 to rotate at different rotational speeds in accordance with a drive signal from the disk drive unit 4.

The disk drive unit 4 outputs to the disk support unit 3 a drive signal for rotationally driving the magnetic disk 200 mounted on the disk support unit 3. Here, the disk support unit 3 is connected to a discrimination unit 2 that outputs a rotation control signal according to the magnetic disk 200 mounted on the disk support unit 3, and responds to the rotation control signal from the discrimination unit 2. The rotation is controlled. That is, the discriminating unit 2 discriminates the magnetic disk 200 mounted on the disk support unit 3 from the control signal output from the control unit 9, and sets the disk support unit 3 according to the rotation control signal corresponding to the magnetic disk 200. The rotation speed of the support 3 is controlled.

More specifically, when the discriminating unit 2 determines that the magnetic disk 200 mounted on the disk support unit 3 is a lower disk, it generates a rotation control signal so as to rotate at a rotation speed for the lower disk. When the discrimination unit 2 determines that the magnetic disk 200 mounted on the disk support unit 3 is the upper disk, it generates a rotation control signal so that the magnetic disk 200 is driven to rotate at the rotation speed for the upper disk. That is, when the upper disk is mounted on the disk support unit 3, the determination unit 2 drives the upper disk to rotate at a higher rotation speed than the lower disk.

As shown in FIG. 2, the magnetic head section 5 includes moving mechanisms 16A and 16B constituting a magnetic head driving section 6 for driving the magnetic head 10, and the moving mechanisms 16A and 16B.
Carriage 1 driven in the disk radial direction by the
2, a gauge holder 13 mounted on the head carriage 12, and a track gauge 14 mounted on the head carriage 12 via the gauge holder 13.
And an optical encoder 15 fixedly attached to a fixing mechanism (not shown), and an arm unit 1 composed of arms 11A and 11B whose base ends are supported by the head carriage 12.
1 and heads 10A and 10B attached to the free ends of the arms 11A and 11B of the arm unit 11 and recording / reproducing information signals to / from the magnetic disk 200, respectively.

Although not shown, the heads 10A and 10B have a lower gap for recording / reproducing information signals on a lower disc and an upper gap for recording / reproducing information signals on an upper disc. . Magnetic head 10
When recording on the magnetic disk 200,
The recording signal from the reproducing unit 8 is input, and the information signal is recorded on the lower disk or the upper disk. The magnetic head 10 outputs a reproduction signal based on the information signal to the recording / reproduction unit 8 to the recording / reproduction unit 8 when reproducing the information signal recorded on the magnetic disk 200.

The arms 11A and 11B of the arm section 11
Are formed in a substantially thin plate shape, and are attached to the head carriage 12 so as to be movable in a direction A facing each other, that is, in a direction in which the magnetic disk 200 approaches and separates from the signal recording surface. And arm 1
1A and 11B support the heads 10A and 10B by positioning them on the magnetic disk 200.
10B is attached to the head carriage 12 so as to apply a predetermined pressing load to the magnetic disk 200. Specifically, when recording / reproducing on the lower disk by the magnetic heads 10A and 10B, a load is applied so as to contact the lower disk and record / reproduce the information signal, and when recording / reproducing on the upper disk, A load is applied so as to fly from the upper disk and record / reproduce information signals.

The moving mechanism 16A is constituted by a voice coil motor which is a so-called linear motor.
8, yokes 19 and 20. This moving mechanism 16A,
16B constitutes a magnetic head driving unit 6 for driving the magnetic head 10. Specifically, the moving mechanism 16A has yokes 19 and 20 fixed to, for example, a chassis of a disk drive device.
8 is attached. And the moving mechanism 16A
The voice coil motor coil 17 is moved so that the voice coil motor coil 17 is movable with respect to the yoke 20.
Is inserted through the yoke 20. A magnet 18 is provided on the inner surface of the yoke 19 and facing the yoke 20.
Is attached. When a voltage is applied to the voice coil motor coil 17 of the moving mechanism 16 </ b> A configured as described above, the voice coil motor coil 17 is driven with respect to the yoke 20. The voice coil motor coil 17 of the moving mechanism 16A is attached to the side surface of the head carriage 12. This moving mechanism 16A
The moving mechanism 16B that faces the head carriage 12 with respect to the moving mechanism 16A is configured similarly to the moving mechanism 16A.

When a driving voltage is applied to the voice coil motor coil 20, the moving mechanisms 16A and 16B drive the voice coil motor coil 20 to drive the head carriage 12 in the radial direction B of the magnetic disk 200. . That is, the arms 11A and 11B are moved in the radial direction B by the moving mechanisms 16A and 16B,
0 is moved in the radial direction B of the magnetic disk 200.

Specifically, the moving mechanisms 16A, 16B
The head drive signal and the tracking signal are input from the control unit 9 and the tracking control unit 7 and driven. The moving mechanisms 16A and 16B drive the magnetic head 10 to move in the radial direction B of the magnetic disk 200 according to the head drive signal. The moving mechanism 16 drives the magnetic head 10 in the radial direction B of the magnetic disk 200 in accordance with the tracking signal. In addition,
The movement of the data tracks of the magnetic head 10 by the moving mechanisms 16A and 16B is executed in response to a track sending request signal sent from an external computer.

The track gauge 14 is formed in a substantially thin plate shape, and is mounted on the head carriage 12 via the gauge holder 13 as described above. Then, the track gauge 14 is used for the magnetic disk 20.
0 so as to be parallel to the radial direction B of the head carriage 1.
2 are arranged.

The track gauge 14 is provided in FIG.
As shown in FIG. 3A and FIG. 3B, the plurality of first openings 21 arranged in the radial direction B and the magnetic disk 10
A second opening 22 is provided on the side.

As shown in FIG. 4, each of the plurality of first openings 21 has substantially the same shape, and has a substantially rectangular shape. Each first opening 21 is formed in the track gauge 14 so as to have a pitch equal to the track pitch of the lower disk. Between each first opening 21, as described later, the light source 2
The light-shielding portion 21a shields light from the light source 3. And
In the track gauge, the area where the first opening 21 is formed in the radial direction B is set to be slightly larger than the width of the data track area formed on the magnetic disk 200. That is, the first openings 21 are formed in a number sufficient to correspond to each data track in the data track area.

The second opening 22 is provided adjacent to the first opening 21 arranged and positioned at the edge of the first opening 21 arranged. I have. More specifically, the second opening 22 is moved to the outermost data track in the data track area of the magnetic disk 200 by the movement of the head carriage 12.
The track gauge 14 is provided so that the second opening 22 is located in the optical encoder 15 when 0 is arranged. That is, the second opening 22 is provided to obtain information for knowing that the magnetic head 10 has been positioned on the outermost data track.

Since the track gauge 14 is mounted on the head carriage 12, the track gauge 14 moves in the radial direction B together with the head carriage 12 according to a head drive signal and a tracking signal from the control section 9 and the tracking control section 7.

As shown in FIG. 5, the optical encoder 15 is composed of a light source 23 and an optical sensor 24 opposed to both side surfaces of the track gauge 14 so as to sandwich the track gauge 14. The optical encoder 15 is fixed by a fixing mechanism (not shown), that is, the optical encoder 15 is positioned relative to the movement of the track gauge 14.

The light source 23 is, for example, a light emitting diode (LED).
a. The optical sensor 24 is, for example, a phototransistor, and is disposed on the inner surface 15b facing the inner surface 15a. By causing the light source 23 provided in the optical encoder 15 to emit light in this manner, the first opening 21 or the second opening provided in the track gauge 14 facing the light source 23 in the optical sensor 24. Light reception via the unit 22 is performed.

This optical sensor 24 is specifically shown in FIG.
As shown in FIG. 6, the first light source 23 that is located at a portion where light from the light source 23 that has passed through the first opening 21
And the second opening 22
And a second phototransistor 24b located at a portion where the light from the light source 23 that has passed therethrough is incident.

Such an optical encoder 15 is, for example,
When the head carriage 12 moves in the radial direction B, the light source 2
The light from 3 generates a sinusoidal optical signal via the track gauge 14.

Here, when the head carriage 12 moves, that is, when the track gauge 14 is moved to the optical encoder 1
Light reception from the light source 23 in the optical sensor 24 in the case where the optical sensor 24 is moved with respect to 5 will be described.

The light sensor 24 receives light from the light source 23 by driving the head carriage 12. That is, the moving mechanisms 16A and 16B are driven according to the head drive signal from the control unit 9, and the head carriage 12 is also driven. When the magnetic head 10 and the track gauge 14 are moved in the radial direction B of the magnetic disk 200, the optical encoder 15
Then, the light from the light source 23 is received by the optical sensor 24 while the track gauge 14 is moving.

In this movement, the track gauge 14
In FIG. 4, the first openings 21 and the shields 21 a shown in FIG. 4 pass between the light source 23 and the optical sensor 24 alternately. As a result, in the first phototransistor 24a,
By receiving the intensity of light from the light source 23 due to the passage of the first opening 21 and the shielding part 21a, as shown in FIG.
A substantially sinusoidal first optical signal _Sa is generated.

In the second phototransistor 24b, when the magnetic head 10 is driven in the outer peripheral direction of the disk, the second opening 22 of the track gauge 14 passes through the second phototransistor 24b, as shown in FIG. as such, the second optical signal S _b that varies substantially step wave shape is generated. Here, the second optical signal S _b is the rise of the step wave shape, the magnetic head 10 will indicate that it has been positioned on the data track of the outermost periphery of the data track area.

[0042] Thus, the second optical signal S _b is identified data tracks are located at the outermost periphery of the data track region, and further a result, formed by the first optical signal S _a to the data track region The position of each data track can be specified.

[0043] Here, a so-called absolute position detection when the second optical signal S _b mentioned above has risen a step wave shape is performed by the absolute position detection function described above by the control unit 9.

Based on each optical signal thus obtained,
Position information corresponding to each data track of the lower disk is generated. Specifically, the first optical signal S _a, the top and bottom values shown in FIG. 8 for each period of the sine wave is stored in the storage unit 25. For example, the storage unit 25 is provided with two storage areas for storing the top value and the bottom value, and the top value and the bottom value correspond to each data track in each storage area. Recorded in order. And the top and bottom values are
The position of the magnetic head 10 in the data track area,
And data for knowing the position of the magnetic head 10 between data tracks at the time of track feed.

[0045] In the following, in the present embodiment, the zero-cross point of the first optical signal S _a and the data track center, and the track pitch for one cycle from the zero-cross point. Therefore, one top value and one bottom value are associated with each data track.

[0046] Further, the position in the data track area of the magnetic head 10, specifically, by counting the top value or bottom value of the first optical signal S _a from the optical encoder 15, the current magnetic head 10 Has detected the data track number where is located. Note that a procedure for obtaining position information from the top value and the bottom value stored in the storage unit 25 during the track feeding process will be described later.

The storage area of the storage unit 25 is described in detail below.
As shown in FIG. 9, a memory unit 25 a for storing a top value, so as to store a top value and a bottom value, respectively.
And a memory unit 25b for storing the bottom value. The top value memory section 25a and the bottom value memory section 25b have a larger number of, for example, 94 top and bottom values than the number of the first openings 21a in which the track gauges 4 are formed. Is configured to be able to accumulate. In this embodiment, the data track area of the lower disk is composed of 80 data tracks. Therefore, an area for storing the top value and the bottom value not corresponding to the data track is secured in the memory units 25a and 25b. Further, specifically, the number of the first openings 21 described above depends on the memory units 25a and 25a.
The number is smaller than the number b, for example, 90, so that the memory units 25a and 25b also have an area for storing a top value and a bottom value not corresponding to the first opening 21. Will be. As a result, since the number of data tracks of the lower disk is 80, extra top values and bottom values that do not correspond to the data tracks are accumulated in the memory units 25a and 25b. Then, the recording / reproducing apparatus 1 uses the memory unit 25
Based on the top value and the bottom value that are additionally stored in a and 25b, control is performed to return the magnetic head 10 to a predetermined data track when the magnetic head 10 is positioned outside the data track area, as described later.

The operation for obtaining the optical signal is performed only when the lower disk is mounted. This is because the lower disk itself does not have so-called position information indicating the position of the data track.

The recording / reproducing apparatus 1 performs tracking of the magnetic head 10 by causing the magnetic head 10 to reach a predetermined data track based on the position information. Tracking is performed by the tracking control unit 7.

As shown in FIG. 1, the tracking control unit 7 controls the tracking when the upper disk is mounted on the disk support unit 3, and the lower disk is mounted on the disk support unit 3 when the lower disk is mounted on the disk support unit 3. And a lower tracking control circuit 7b for controlling the tracking when the tracking error occurs.

The upper tracking control circuit 7a is a circuit for performing tracking based on a position information signal such as a tracking signal recorded in advance on a data track of an upper disk. For example, a tracking signal is recorded on a data track of the upper disk, and the upper tracking control circuit 7a performs tracking in accordance with the tracking signal.

Further, the lower tracking control circuit 7b
As shown in FIG. 10, is performed based on the first optical signal S _a and the set reference line O so as to intersect to the above is obtained by moving the magnetic head 10. Here, the first
, A _n-1 , a _n ,... Correspond to the center of each data track of the lower disk.

That is, the lower tracking control circuit 7b
Controls the magnetic head 10 so that it converges on the desired data track when the magnetic head 10 is moved, that is, when the magnetic head 10 reaches the zero cross point corresponding to the predetermined data track. Tracking (hereinafter, this tracking operation is referred to as track following).

The control unit 9 includes the disk drive unit 4 described above,
It has a function of outputting control signals to the recording / reproducing unit 8, the magnetic head driving unit 6, and the tracking control unit 7 to control each component. The storage unit 25 described above is connected to the control unit 9.

For example, when the magnetic disk 200 is mounted, the control unit 9 outputs each control signal to the disk drive unit 4, the magnetic head drive unit 6, and the tracking control unit 7. Further, the determination unit 2 outputs a rotation control signal applied to the magnetic disk 200 to the disk support unit 3 based on a control signal output from the control unit 9.

That is, when the magnetic disk 200 is mounted, the disk drive unit 4 drives the disk support unit 3 to rotate based on the control signal. Then, the tracking control unit 7 sets a state where a tracking signal can be generated by either the upper tracking control circuit 7a or the lower tracking control circuit 7b based on the control signal. The recording / reproducing unit 8 performs the recording / reproducing process by changing the data transfer rate or the like according to the upper disk and the lower disk based on the control signal from the control unit 9.

An external computer interface 100 is connected to the control unit 9. The external computer interface 100 is an interface with an external computer (not shown), and transmits control signals and the like transmitted from the external computer to the control unit 9. For example, at the time of recording / reproduction, a track feed request signal sent from an external computer is transmitted to the control unit 9. As described above, the recording / reproducing apparatus 1
Each section and each circuit are configured. The operation of the recording / reproducing apparatus 1 when a lower disk is mounted on the recording / reproducing apparatus 1 configured as described above will be described below.

When the lower disk is mounted on the disk support 3, the recording / reproducing apparatus 1 moves the magnetic disk 10 once in the inner circumferential direction of the lower disk, and then moves the magnetic head 10 in the outer circumferential direction of the lower disk. The head carriage 12 is driven so as to move to. At this time, the drive of the magnetic head 10 is performed by the recording / reproducing apparatus 1 using a predetermined drive signal.

When the head carriage 12 is driven to move the magnetic head 10 in the outer peripheral direction of the lower disk, as described above, the first carriage as shown in FIG.
Retraction of the optical signal S _a takes place. Then, the recording / reproducing device 1 stores the above-described top value and bottom value in the received first optical signal Sa in _a predetermined storage area of the storage unit 25. Here, each top value and each bottom value are stored in the storage area in association with each data track.

Then, the recording / reproducing apparatus 1 waits until a track feed request signal is sent from an external computer. The recording / reproducing apparatus 1 detects that the track feed request signal has arrived from the external computer via the external computer interface 100 by the control unit 9, and the control unit 9 outputs a control signal corresponding to the track feed request signal. Output to the magnetic head drive unit 6.

Here, for example, when the magnetic head 10 is sent to an adjacent data track when a one-track feed request is made, specifically, when the magnetic head 10 is sent in a track direction on the magnetic disk in the outer circumferential direction. explain.

As shown in FIG. 11, the control unit 9 roughly divides the magnetic head 10 into movement start control in a movement start control section (positions X _{0 to} X ₁ in FIG. 11).
Control section after the start of movement (positions X _{1 to} X ₂ shown in FIG. 11)
In this case, different control is performed between the magnetic head 10 and the magnetic head 10 in the adjacent data track.

First, the control unit 9 causes the magnetic head driving unit 6 to unconditionally output a head driving signal of the maximum driving force in the direction according to the track feed request signal arriving via the external computer interface 100. As
The magnetic head driving unit 6 is controlled. That is, FIG.
As shown in, the head drive signal S _H to be a kick pulse for applying a maximum driving force for starting moving the magnetic head 10 is outputted.

[0064] Then, the control unit 9, to the magnetic head 10 reaches the predetermined position X _1, and controls the magnetic head driver 6 to hold the head driving signal S _H. The predetermined distance that holds the head drive signal S _H for applying the maximum driving force is determined as a necessary and sufficient value to reach the data tracks adjacent. That is, the control unit 9 controls the speed of the magnetic head 10 so that the magnetic head 10 performs speed control by a predetermined driving force between a data track of a transmission source and a data track of a transmission destination by a predetermined driving force in a post-movement start control section described later. The driving of the magnetic head 10 is started unconditionally without performing the above operation. Thereby, the position and the initial moving speed of the magnetic head 10 reach the respective predetermined values.

Here, the + value of the head drive signal S _H moves the magnetic head 10 toward the outer periphery of the disk (forward drive).
The negative value is a signal for applying a driving force for moving the magnetic head 10 in the disk inner circumferential direction (reverse driving). Therefore, as in this example, when the track circumferentially perform track feed, change to + value of the head driving signal S _H represents the acceleration of the magnetic head 10, the head drive signal S _H
A change in the-direction indicates that the magnetic head 10 is decelerated.

Also, due to this movement of the magnetic head 10,
From the optical encoder 15, (change in position X ₀ and subsequent head drive signal S _H) the first optical signal S _a1 indicating that the magnetic head 10 is driven is output. Then, in the post-movement control section after the movement start control section, the control section 9 controls the moving speed of the magnetic head 10 based on the first optical signal _Sa1 output from the optical encoder 15. . That is, in the control section after the start of movement, the control unit 9
The kick pulse for applying the maximum driving force described above falls, and subsequently, the servo of the moving speed of the magnetic head 10 is performed based on the first optical signal _Sa1 . And the control part 9
In the section after the start of the movement control, the speed of the magnetic head 10 is controlled while monitoring the position of the magnetic head 10 at regular time intervals.

For example, the control unit 9 monitors the position of the magnetic head 10 at a constant value of 0.24 msec and controls the speed.

More specifically, the driving of the magnetic head 10 in the control section after the start of the movement is performed based on a comparison between a preset speed profile and the actual moving speed of the magnetic head 10. The speed is controlled.

For example, as shown in FIG. 12, the speed profile is constituted by a so-called expected speed table including a current position and an expected speed corresponding to the current position. Here, the current position is the current position of the magnetic head 10 between the source data track and the destination data track. The expected speed is a so-called ideal speed at the current position. If the magnetic head 10 has the expected speed at the current position corresponding to the expected speed, the arrival of the magnetic head 10 is scheduled. This indicates that the speed is sufficient and sufficient to reach the adjacent data track. For example, the speed profile is stored in the storage unit 25. The kick pulse falls at a position "8" of positions "0" to "39" when the distance between the data tracks is divided into 40 as described later. The servo of the moving speed of the magnetic head 10 is performed based on the optical signal _Sa1 .

The controller 9 controls the moving speed of the magnetic head 10 with reference to the speed profile so that the magnetic head 10 at the current position is at the expected speed. ing. That is, the control unit 9
Selects the ideal moving speed of the magnetic head 10 based on the current position with reference to the speed profile, and controls the movement of the magnetic head 10 so as to reach the selected moving speed.

Specifically, the control unit 9 obtains the current position of the magnetic head 10 between the data track of the transmission source and the data track of the transmission destination from the position information table, and determines the current position obtained from the position information table. The movement of the magnetic head 10 is controlled with reference to the speed profile. Here, the position information table reads the top value and the bottom value corresponding to the position between the data tracks of the magnetic head 10 from the storage unit 25, and as shown in FIG. Is a table generated to form. That is, a sine wave signal substantially similar to that obtained by the first pull-in is generated from the top value and the bottom value stored in the storage unit 25 after the first pull-in. Specifically, this waveform is shown as a quantized table, and FIG.
In the graph, the horizontal axis indicates the position in the data track, and the vertical axis indicates the quantized Band value. The Band value and the position direction are each equally divided. In the present embodiment, the Band value has 30 steps from 0 to 29 and the position direction has 0 to 29.
It is divided into 40 steps up to 39. In other words, this corresponds to a position obtained by dividing the width of one data track by 40 corresponding to each Band value. As described above, in the embodiment of the present invention, the zero-cross point is set as the center of the data track, and one cycle of the zero-cross point corresponds to the position in the source data track and the destination data track. That is, the position information table shown in FIG. 13 indicates the position between the data tracks.

[0072] Note that the first optical signal S _a which is output from the optical encoder 15, may be offset to the DC component, for example, in some cases so obtained is shown in Figure 14. Then, by generating the position information table as a normalized sine wave based on the top value and the bottom value, it is possible to eliminate the influence of the offset of the sine wave signal corresponding to each data track.

As described above, the position between the data tracks is determined by the Band value and the first optical signal S _a obtained by actually moving the magnetic head 10 on the data track.
By comparing with the value of Here, the first optical signal S _a, as shown in FIG. 15, is monitored for each fixed time, the magnetic head 10 is detected by a voltage value such as a position within the data track being currently located . Therefore, the actually obtained first optical signal _Sa is converted into a digital value by a D / A converter (not shown).
The comparison is made in the position information table shown in FIG. The first optical signal S _a is monitored by the 0.24msec intervals.

Specifically, as shown in FIG.
When obtaining the digital numbers D _B in the optical signal S _a,
According to equation (1), _B is calculated based on the digital value DB.
An and number is calculated.

Band number = D _B −bottom value / ((top value−bottom value) / 30) (1) Then, the Band signal obtained from the above equation (1), that is, the actual position of the magnetic head 10. The position corresponding to the Band value can be obtained by referring to the already obtained position information table shown in FIG.

[0076] Thus, based actually on the top and bottom values have been stored in the first optical signal S _a and the storage unit 25 obtained by moving the magnetic head 10, the magnetic head 10 in the data track The position can be accurately detected.

Then, the control section 9 calculates the actual moving speed of the magnetic head 10 (hereinafter referred to as a measured speed) from the detected position, and compares it with the expected speed in the speed profile. Measurement speed, the first optical signal S _a which is output from the optical encoder 15 that monitors at regular time intervals is calculated by the difference. That is,
Monitoring the first optical signal S _a as shown in FIG. 15 at every predetermined time, detects a position of the magnetic head 10 from the position information table as described above, determined by dividing in the predetermined time interval Calculate the speed. That is, measurement speed = (position of current time−1 position before time) / Δt. Here, Δt is the constant time interval for monitoring and is 0.24 msec.

Then, the measured speed is compared with the expected speed to control the magnetic head 10 to be surely moved to the adjacent data track. The moving speed of the magnetic head 10 at each position is specifically controlled according to a flowchart shown in FIG.

First, in step S1, a digital value (quantized first optical signal S _a ) from the optical encoder 15 is read. Subsequently, as shown in step S2, the top value and the bottom value are read from the storage unit 25,
As described above, the position information (0 to 39) on the sine wave for one cycle normalized is generated.

Then, in step S3, a measurement speed is calculated. That is, the measured speed V _M = (current position−Δ
t) / Δt is calculated. Further, in the following step S4, searches the expected speed V _E corresponding to the current position from the table (speed profile).

[0081] Then, step S5, in step S6 and step S7, selects the coefficients K from the relationship of the measurement speed V _M and values expected speed V _E. Here, the coefficient K is a gain and is a parameter for determining the control strength. Therefore, in the present embodiment, the coefficient K is
Since it is determined by the determination in steps S5, S6 and S7, it is determined depending on the speed.

After the coefficient K is determined, step S8
In the control signal output from the control unit 9 to the magnetic head driving portion 6 is calculated by the control signal _{C = K × (V E -V} M). Here, the control signal C is a signal having a code, that is, in the case of V _E <V _M (if better measurement than the expected speed rate is excessive), a negative value, When V _E > V _M (when the measured speed is smaller than the expected speed), the value becomes a positive value.

The control signal C obtained in step S8 is output to the magnetic head driving section 6 in step S9. The magnetic head driving unit 6 controls driving of the magnetic head 10 by a head driving signal based on a control signal C from the control unit 9. If the control signal C is negative, that is, if the measured speed is higher than the expected speed, the magnetic head driving unit 6 moves the magnetic head 10 in the reverse direction to the control signal C. Drive according to the value of. On the other hand, when the control signal C is positive, that is, when the measured speed is smaller than the expected speed,
The magnetic head driving section 6 drives the magnetic head 10 in the positive direction according to the value of the control signal C. Note that V _E = V _M
In this case, the magnetic head driving unit 6 sets the driving force applied to the magnetic head 10 to zero. By the drive control by the magnetic head drive unit 6, the magnetic head 10 is smoothly decelerated toward a predetermined data track.

In step S10, it is determined whether the current position of the magnetic head 10 has exceeded the adjacent data track arrival point. Here, when it is determined that the current position has exceeded the position of the adjacent data track, the control for sending to the adjacent data track is terminated, and the above-described track follow control is performed. If the current position does not exceed the adjacent data track arrival position, the process ends.

As described above, after the magnetic head 10 reaches the predetermined speed by the kick pulse, the magnetic head 1
In this example, since the movement speed is controlled to 0, FIG.
As shown in 1, the head driving signal S _H of the movement start after it control section (X ₁ to X ₂₎ is changed. For example, in this example,
The value of the head drive signal S _H is + than the value - the value and has been towards many, which in movement start after your control section (X ₁ ~X _2), the magnetic head 10 head drive signal S _H is mainly It can be seen that the vehicle is controlled to decelerate.

As described above, in response to the track feed request signal, the magnetic head 10 is started to be driven by the kick head driving force for driving the magnetic head. By monitoring the position and moving speed of the magnetic head 10 and appropriately controlling the moving speed, the magnetic head 10 can reach a predetermined data track. Then, the recording / reproducing apparatus 1 controls the track following of the magnetic head 10 sent to a predetermined data track by the lower tracking control circuit 7b with respect to the sent data track. That is, as shown in FIG. 10, the recording / reproducing apparatus 1 positions the magnetic head 10 sent by the seek track to the adjacent data track at a desired position in the data track by the track following. Note that the lower tracking control circuit 7b is inactive when the track feed control is being performed as described above.

As described above, the recording / reproducing apparatus 1 applies the maximum driving force, which is a kick pulse sufficient to reach the data track of the track destination requested by the external computer, to the magnetic head 10 at the predetermined position. Until it reaches. And after that, record /
The reproducing apparatus 1 controls the moving speed of the magnetic head 10 at each moving position based on the speed profile, and sends the magnetic head 10 to the requested data track.

Therefore, the magnetic head 10 is guaranteed to move in one direction and to a predetermined position, and thereafter, is moved by the driving force applied at the start of the movement, and can be driven only by speed control such as acceleration or deceleration. Is moved to the adjacent data track. That is, the recording / reproducing apparatus 1 can complete the transmission to the destination data track without determining the moving direction of the magnetic head 10 during the movement between the data tracks for the track transmission. Thus, the recording / reproducing apparatus 1 can complete the track feed of the magnetic head 10 within a predetermined time.

Here, the recording / reproducing apparatus 1 controls the magnetic head 1 over the entire range of the data track area of the lower disk.
0 by scanning, operation for acquiring the position information of the lower disc, i.e., the operation of accumulating the top and bottom values of the first optical signal S _a in the storage unit 25 will be described.

The memory units 25a and 25b in which the top value and the bottom value are stored in the storage unit 25 store the top value and the bottom value which are equal to or more than the number of data tracks as described above with reference to FIG. Is set to the storage area. As a result, due to the operation for acquiring the position information of the lower disk, the top values and the bottom values that do not correspond to the data tracks are stored in the memory units 25a and 25b, respectively.

That is, the recording / reproducing apparatus 1 needs to accumulate at least the top value and the bottom value corresponding to the data track in order to generate the position information of the lower disk. For this purpose, the entire range including the data track area is scanned by the magnetic head 10, it is necessary to perform the pull-in operation of the first optical signal S _a, as a result, the magnetic head 10 in the area outside of the data track region , A top value and a bottom value are obtained, and are stored in the memory units 25a and 25b without corresponding to data tracks.
That is, the memory section 25 is not supported by the data track.
The values stored in the a and 25b are the values corresponding to the first opening 21 formed outside the data track area but not corresponding to the data track, and the first
There is a value that does not correspond to the opening 21 of FIG.

The recording / reproducing apparatus 1 according to the embodiment of the present invention uses the top value and the bottom value stored in the memory units 25a and 25b by moving the magnetic head 10 out of the data track area. A significant value closest to the current position of the magnetic head 10 is detected, for example, the magnetic head 10 is returned to a predetermined data track.

When the magnetic head 10 is positioned outside the data track area, significant top and bottom values stored in the memory sections 25a and 25b are detected, and the magnetic head 10 is returned to a desired data track. Is conducted as follows.

First, as described above, the first optical signal S _a
In the pull-in operation, the recording / reproducing apparatus 1 detects that the lower disk is attached to the recording / reproducing apparatus 1, and moves the magnetic head 10 to the inner peripheral side of the lower disk once. By this movement, the magnetic head 10 is positioned at a predetermined position in the data track area. And record /
The reproducing apparatus 1 moves the magnetic head 10 in the outer peripheral direction of the disk. Thus, the recording / reproducing apparatus 1 performs the retraction of the first optical signal S _a by the optical encoder 15. The retraction of the first optical signal S _a, the magnetic head 10 is performed until the position outside the data track area. Such drawing operation, to obtain the first optical signal S _a as shown in FIG. 17, the first top and bottom values of the optical signal S _a is the memory 25a of the recording unit 25,
25b.

For example, points S _T79 and S _B79 shown in FIG. 17 are points at which the top value and the bottom value corresponding to the innermost data track in the data track area are obtained. Further, the points S _T00 and S
_B00 is a point at which a top value and a bottom value corresponding to the outermost data track in the data track area are obtained. As shown in FIG. 17, the outermost data track of the data track area (the point _ST00
And also in the data tracks) thereafter being corresponding to the point S _B00, the first optical signal S _a is obtained, it is respectively stored in the memory 25a and the memory 25b as a top and bottom values.

[0096] Here, the magnetic head 10 is positioned outside the data track region, and the first optical signal S _a which the first opening 21 is output from the optical encoder 15 which is positioned in a portion not formed , And a noise signal that is invalidated. Then, even in such a case, the noise signal portion of the first optical signal S _a, as shown in FIG. 18,
It may be read as a top value and a bottom value.

As a result, the top value and the bottom value in the noise signal are accumulated in the memory unit 25a and the memory unit 25b as well as the top value and the bottom value output corresponding to the first opening 21. Would. That is, invalid top values and bottom values for which the position information table cannot be created are accumulated.

The recording / reproducing apparatus 1 calculates a significant top value and a bottom value closest to the current position of the magnetic head 10 from the top value and the bottom value including the invalid values obtained outside the data track area. , And the track feed control is started when the significant top value and bottom value are detected, and the magnetic head 10 is returned to the data track area. Hereinafter, a procedure for searching for the significant top value and bottom value from the top value and bottom value including the invalid value will be specifically described with reference to FIG.

First, in step S31, the control unit 9
Stores the value of the top pointer located in the top value memory 25a, and the value of the top pointer located in the bottom value memory 25b.

Then, in step S32, the control section 9 makes a determination by the following equation (2).

(Top value in the memory unit 25a indicated by the top pointer)-(Bottom value in the memory unit 25b indicated by the bottom pointer)> 3/4 (top value corresponding to track number 0)-(Track number 0) (2) Note that the track number 0 is detected by the absolute position detection function of the control unit 9, and accordingly, the top value and the bottom value corresponding to the track number 0 are detected. _{Are the} top value and the bottom value corresponding to the absolute position (the top value and the bottom value corresponding to the points _ST00 and _SB00 ).

That is, the control section 9 controls whether or not there is a certain difference between the top value in the memory section 25a indicated by the top pointer and the bottom value in the memory section 25b indicated by the bottom pointer. The determination is made based on the top value and the bottom value corresponding to the absolute position detected by the absolute position detecting function of the unit 9. Here, when it is confirmed that the above equation (2) holds, the control unit 9 proceeds to step S38.
If the control section 9 confirms that the equation (2) does not hold, the control section 9 proceeds to step S33.

In step S38, the control unit 9
Processes the value indicated by the top pointer and the value indicated by the bottom value as valid values, reports that valid top and bottom values have been detected in the subsequent step S39, and ends the search processing.

On the other hand, in step S32, the above (2)
Step S to proceed when it is confirmed that the formula does not hold
At 33, the control unit 9 stores the top pointer in the memory unit 25.
a to the next top value store in a,
In step S34, the bottom pointer is stored in the memory unit 2
Move to the next bottom value storage in 5b. Then, in step S35, the control unit 9 adds 1 to the counter.

The control section 9 determines in step S36 the value of the counter to which step S35 has been added. That is, the control unit 9 determines whether or not the counter value> the predetermined value. Here, when it is confirmed that the counter value> the predetermined value is satisfied, in step S37, the controller 9
Reports that no valid top and bottom values have been detected, and terminates the search process. On the other hand, if it is confirmed that the counter value> the predetermined value is satisfied, the control unit 9
Performs a process of restarting the process from step S32. That is, if the pointer cannot move the storage portion of the top value and the bottom value by a predetermined number to confirm the valid top value and bottom value,
The search process ends without setting the top value and the bottom value as valid values. For example, the predetermined value is 20
To

When the magnetic head 10 is positioned outside the data track area, the recording / reproducing apparatus 1 detects significant top and bottom values stored in the memory sections 25a and 25b, and performs the detection. Track feed control by the magnetic head 10 is started at a position corresponding to the top value and the bottom value, and the magnetic head 10 is returned to a predetermined data track. Regarding the movement of the magnetic head 10 to a position corresponding to the significant top value and bottom value, the magnetic head 10 is driven in the inner circumferential direction of the disk by a predetermined drive signal, and the significant top value and bottom value are moved. Is moved to the position corresponding to.

A predetermined position in the data track area from a position corresponding to the significant top value and bottom value,
For example, for the operation of returning to track number 0, see FIG.
As shown in FIG. 7, the magnetic head 1 is temporarily controlled by the above-described track follow control in the data track corresponding to the significant top value (the top value at the position ST _Tnp ) and the bottom value (the bottom value at the position SB _Tnp ).
After 0 is stopped at the track center position C _tnp , the magnetic head 10 is moved based on the position information table.

That is, as shown in FIG. 17, the top value and the bottom value satisfying the condition of 3/4 of the top value and the bottom value of the corresponding position S _T00 and the position S _B00 of the track number 0 are set to (position ST _{Tnp And} the top value and the bottom value of the position SB _Tnp ) are found from the memory units 25a and 25b, respectively. Then, the movement of the magnetic head 10 in the inner circumferential direction of the disk is started, and the data track center position C _Tnp corresponding to the top value and the bottom value satisfying the condition of 3/4 of the top value and the bottom value of the track number 0 described above. When the vehicle reaches the vicinity, the track follow control is performed. With this track follow control, the magnetic head 10 is once stopped at the data track center position C _Tnp . Then, from the data track center position C _Tnp , the data track center position C _{00 of the} track number 0 is obtained.
The magnetic head 10 performs track feed control of one track toward the stops in the data track center position C _00.

[0109] Thus, the recording / reproducing apparatus 1 will after retraction of the end of the first optical signal S _a, moves the magnetic head 10 to a prescribed data tracks in the data area, to be able to wait .

[0110] As described above, the recording / reproducing apparatus 1 performs pull-in operation of the first optical signal S _a which stores top and bottom values in the storage unit 25.

As described above, the recording / reproducing apparatus 1 scans the entire data track area by the magnetic head 10 in advance, and creates position information corresponding to each data track. Therefore, after the position information is created, that is, after the magnetic head 10 scans the data track area, the recording / reproducing apparatus 1 positions the magnetic head 10 outside the data track area. Then, as the next operation, the recording / reproducing device 1
Detects a significant value from the top value and the bottom value obtained outside the data track area, starts the track feed control from a position corresponding to the significant value, and moves the magnetic head 10 to a predetermined data track. It is moving.

That is, the recording / reproducing apparatus 1 detects a significant top value and bottom value outside the data track area, and based on the significant top value and bottom value, detects the significant top value and bottom value. The track feed control of the magnetic head 10 can be started from the position corresponding to. Thereby, the recording / reproducing apparatus 1
Thus, the magnetic head 10 can move a predetermined data track to a predetermined data track.

[0113] Thus, the recording / reproducing apparatus 1, in the first optical signal S _a of pull-in operation after the completion, it is possible to move the magnetic head 10 to a predetermined data track, for example, thereby, the magnetic head 10 Processing such as writing of an information signal to a desired data track can be executed without any problem.

[0114] In this embodiment, when the magnetic head 10 by the retraction of the first optical signal S _a is located outside the data track, for carrying out the detection of the significant top and bottom values Explain. However, the recording / reproducing apparatus 1 is not limited to this.
Even when 0 is located, the significant top value and bottom value described above can be detected. Thus, even when the magnetic head 10 is positioned outside the data track area for some reason during the recording / reproducing processing, the magnetic head 10 can be returned to the data track area.

[0115]

The recording / reproducing apparatus according to the present invention obtains a track movement detection signal generated by passing the data track area by the position detecting means, and obtains the top value and the bottom value in the track movement detection signal. The value is stored in the storage means, and the significant top value and bottom value of the top value and the bottom value accumulated in the storage means can be detected by the detection means. Then, the recording / reproducing apparatus can detect the significant top value and the bottom value closest to the current position of the recording / reproducing head by the absolute position detecting means.

Thus, the recording / reproducing apparatus can start control such as track feed even when the recording / reproducing head is positioned outside the data track area.
It can be moved to a predetermined data track.

Further, in order to solve the above-mentioned problem, the recording / reproducing method according to the present invention obtains a signal corresponding to the track movement of the recording / reproducing head and stores the top value and the bottom value in the signal. Storing a top value and a bottom value in a track movement detection signal obtained by a recording / reproducing head passing through a data track area; and storing the top value and the bottom value stored in the storage step. Detecting a significant top value and a bottom value among the bottom values; and detecting an absolute position of the recording / reproducing head at a predetermined position when the recording / reproducing head is moved over the entire range. And a process. Then, the recording / reproducing method includes moving the recording / reproducing head over the entire range including the data track area, and based on the absolute position obtained in the absolute position detecting step, the significant / closest position closest to the current position of the recording / reproducing head. Detect top and bottom values.

As a result, according to the recording / reproducing method, even when the recording / reproducing head is positioned outside the data track area, control such as track feed can be started.
It can be moved to a predetermined data track.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a magnetic head provided in the recording / reproducing apparatus.

FIGS. 3A and 3B are diagrams showing an example of a track gauge provided in the recording / reproducing apparatus, wherein FIG. 3A is a side view, and FIG. 3B is an enlarged view of a first opening and a second opening. FIG.

FIG. 4 is an enlarged plan view of the second opening.

FIG. 5 is a front view showing a structure of an optical encoder included in the recording / reproducing apparatus.

FIG. 6 is a side view showing a case where the optical encoder is viewed from an inner side surface 15b.

FIG. 7 is a diagram showing a first optical signal and a change in the first optical signal obtained when the magnetic head provided in the recording / reproducing apparatus is moved from the inner peripheral side to the outer peripheral side of the magnetic disk.

FIG. 8 is a diagram showing a top value and a bottom value of the first optical signal stored in a storage unit of the recording / reproducing apparatus.

FIG. 9 shows a storage unit provided in the recording / reproducing apparatus.
FIG. 3 is a diagram illustrating a storage area for storing a top value and a bottom value.

FIG. 10 is a diagram used to explain that the recording / reproducing apparatus performs track following on a data track based on a first optical signal.

FIG. 11 is a diagram showing an example of controlling the moving speed of a magnetic head based on a first optical signal obtained from the optical encoder when the magnetic head is track-fed between data tracks, and FIG. 7 is a diagram showing the history of a head drive signal and a first optical signal when the head is moved to a data track that has been moved.

FIG. 12 is a diagram showing a speed profile used for controlling a moving speed of a magnetic head to be track-fed.

FIG. 13 is a diagram showing a position information table obtained as a normalized sine wave signal obtained based on the top value and the bottom value stored in the storage unit.

FIG. 14 is a diagram showing _a first optical signal Sa obtained near the outer periphery of a data track area.

FIG. 15 is a diagram illustrating an example of sampling of a first optical signal output from an optical encoder.

FIG. 16 is a flowchart for controlling the moving speed of the magnetic head to send the magnetic head to an adjacent data track.

FIG. 17 is a diagram used for explaining a top value and a bottom value obtained in _a first optical signal Sa to be drawn.

FIG. 18 shows a first example obtained outside the data track area.
A of the optical signal S _a, shows that it contains the top and bottom values in the signal rising.

FIG. 19 is a flowchart showing steps of a process for detecting a significant top value and a bottom value.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 recording / reproducing device, 6 magnetic head drive unit, 9 control unit, 10 magnetic head, 25 storage unit

Claims (7)

[Claims] 1. A recording / reproducing apparatus for recording / reproducing an information signal on / from a data track of a recording medium having a data track area in which a plurality of data tracks are formed substantially in parallel. A recording / reproducing head for recording / reproducing an information signal; a head driving means for moving the recording / reproducing head in a direction perpendicular to a plurality of data tracks on the recording medium; A position detecting means for obtaining a signal corresponding to the track movement of the above, and a top value and a bottom value in the sine wave signal for one cycle obtained by the position detecting means are stored. Each top value and bottom value in a track movement detection signal obtained by passing through the data track area by the head driving means is accumulated. Storage means; detection means for detecting a significant top value and bottom value among the top value and bottom value stored in the storage means; and the recording / reproducing head uses the head drive means to control the data track area. An absolute position detecting means for detecting an absolute position of the recording / reproducing head at a predetermined position when the recording / reproducing head is moved over the entire range. A recording / reproducing apparatus for detecting the significant top value and bottom value closest to the current position of the recording / reproducing head based on the absolute position information obtained by the method. 2. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing head is stopped based on the detected top value and bottom value. 3. The signal obtained by the position detecting means is 1
2. The recording / reproducing apparatus according to claim 1, wherein the signal is a sine wave signal for one cycle corresponding to the movement amount of the data track. 4. After the recording / reproducing head is positioned outside the data track area, based on the significant top value and bottom value closest to the current position obtained by the detection means, the data is recorded in the data track area. 2. The recording / reproducing apparatus according to claim 1, wherein the recording / reproducing head is returned. 5. An apparatus for recording / reproducing an information signal on / from a first recording medium having a first recording density and a second recording medium having a second recording density higher than the first recording density. When the first recording medium is mounted, the recording / reproducing head moves over the entire range including the data track area, and the detecting means detects the significant top value closest to the current position and 2. The recording / reproducing apparatus according to claim 1, wherein a bottom value is detected. 6. The head drive unit includes: a support unit that supports the recording / reproducing head on the recording medium; and the plurality of data tracks of the recording medium that supports the recording / reproducing head supported by the support unit. 2. The recording / reproducing apparatus according to claim 1, further comprising a linear motor that moves in a direction perpendicular to the recording medium. 7. A recording / reproducing method for recording / reproducing an information signal on / from the data track of a recording medium having a data track area in which a plurality of data tracks are formed substantially in parallel. Obtaining a signal corresponding to a track movement of the reproducing head and storing a top value and a bottom value in the signal, wherein a track movement detection obtained by the recording / reproducing head passing through the data track area is obtained. A storage step of storing each top value and bottom value in the signal; a detection step of detecting a significant top value and bottom value of the top value and bottom value stored in the storage step; Detecting an absolute position of the recording / reproducing head at a predetermined position when the head is moved over the entire range, The recording / reproducing head is moved over the entire range including the data track area, and based on the absolute position obtained in the absolute position detecting step, the significant top value and the bottom closest to the current position of the recording / reproducing head. A recording / reproducing method characterized by detecting a value.