JP2003109332A - Disk drive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk drive capable of suppressing the number of retrying times of a moving operation and a method for controlling optical pickup movement. SOLUTION: A nonvolatile memory 335 for storing a maximum rotational speed is mounted on the disk drive 300. The nonvolatile memory 335 stores the maximum rotational speed (e.g. maximum rotational speed V4) of a stepping motor 100 when loss of synchronism is not detected any more by retrying a seek operation. In this case, the power of the disk drive 300 is turned off after the maximum rotational speed V4 is stored in the nonvolatile memory 335, and when the power of the disk drive 300 is turned on again, a controlling part 330 of the disk drive 300 acquires the maximum rotational speed V4 of the stepping motor 100 stored in the nonvolatile memory 335, i.e., the maximum speed of rotation of the stepping motor 100 when loss of synchronism is not detected any more in a seek operation mode and sets the maximum speed as the maximum rotational speed for the stepping motor 100.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device equipped with a stepping motor for transferring an optical pickup.

[0002]

2. Description of the Related Art CD-RW (Compact Disc ReWritabl
2. Description of the Related Art Disc devices for recording information on a disc such as e) or CD-R (Compact Disc Recordable) or reproducing information already recorded on the optical disc are widely put into practical use.

Such a disk device is equipped with an optical pickup for irradiating a disk with a light beam, an optical pickup transfer mechanism for transferring the optical pickup in the radial direction of the disk, and the like. When a desired track is searched (seeked) from a plurality of tracks formed on the disk, the disk device moves the optical pickup to the vicinity of the desired track by an optical pickup transfer mechanism. In order to perform this transfer operation at high speed, it is necessary to transfer the optical pickup at high speed to the vicinity of a desired track by an optical pickup transfer mechanism.

FIG. 6 is a view showing the arrangement of an optical pickup transfer mechanism equipped with a stepping motor. The stepping motor 100 is a motor whose rotation speed and rotation speed are controlled according to the number and frequency of pulses supplied from a motor driver (not shown) or the like. The stepping motor 100 is provided with a lead screw 110 having spiral grooves formed at a constant pitch P. The lead screw 110 is attached so as to be parallel to the radial direction of a disc (not shown), and the optical pickup 20
0 is arranged so as to be movable along the groove of the lead screw 110. With this configuration, the optical pickup 200 moves in the radial direction of the disc 10 by the pitch P of one lead screw 110 each time the stepping motor 100 makes one revolution. As described above, the rotation speed and rotation speed of the stepping motor 100 are controlled according to the number and frequency of the given pulses. Therefore, the optical pickup 2 is moved by the optical pickup transfer mechanism.
In order to transfer 00 at high speed, stepping motor 1
In order to increase the rotation speed of 00, the frequency of the pulse needs to be set high.

[0005]

However, if the frequency of the pulse is set high, the stepping motor 10
The torque generated at 0 becomes small. Here, if the frequency of the pulse given to the stepping motor 100 exceeds a predetermined frequency, a phenomenon called step out occurs in which the stepping motor 100 does not rotate even if the pulse is added. When this step-out occurs, it is between the moving distance of the optical pickup 200 estimated from the number of pulses given to the stepping motor 100 and the distance actually moved by giving the pulse to the stepping motor 100. Shift occurs.
Conventionally, it is necessary to retry the transfer operation many times in order to correct the deviation and transfer the optical pickup 200 to the vicinity of a desired track. As a result, it takes a long time to obtain a stable operation. There was a problem.

The present invention has been made in view of the circumstances described above, and an object of the present invention is to provide a disk device capable of suppressing the number of retries of the transfer operation.

[0007]

In order to solve the above-mentioned problems, a disk device according to the present invention is provided with an optical pickup and a transfer means for transferring the optical pickup in a radial direction of a disk-shaped recording medium. Driving means for driving the transfer means within the range of the maximum transfer speed, storage means for holding the maximum value of the written transfer speed even when the power supply of the disk device is cut off, and the transfer means When the transfer operation is performed by the setting means, the setting means has a function of setting the maximum value of the transfer speed in the driving means and a function of changing the maximum value of the transfer speed set in the driving means, and the transfer means is set by the setting means. Writing means for writing the changed maximum value of the transfer speed to the storage means when the maximum value of the speed is changed, and the setting means,
When the transfer operation is performed for the first time after the disk device is powered on, the maximum value of the transfer speed stored in the storage means is set in the drive means.

According to this structure, the setting means sets the maximum value of the transfer speed to the drive means for driving the transfer means within the set maximum value of the transfer speed, and then, for example, the transfer by the transfer means is performed. When the transfer is not normally performed, the maximum value of the transfer speed is changed to, for example, a low value. The writing unit writes the maximum value of the changed transfer speed in the storage unit (nonvolatile memory or the like). The maximum value of the transfer speed written by the writing means is still held even after the power supply of the disk device is cut off, and when the transfer operation is executed for the first time after the power supply of the disk device is turned on again, The maximum value of the transfer speed stored in the storage means is set in the drive means, and as a result, the number of retries of the transfer operation is compared with the case where the maximum value of the transfer speed before change is set in the drive means. It becomes possible to suppress.

Further, in the disk device according to the present invention, the optical pickup, the transfer means for transferring the optical pickup in the radial direction of the disk-shaped recording medium, and the transfer within the set maximum value of the transfer speed. Drive means for driving the means, storage means for holding the maximum value of the transfer speed, and the maximum value of the transfer speed stored in the storage means when the transfer operation is executed by the transfer means. Setting means having a function of setting and a function of changing the maximum value of the transfer speed set in the driving means, and the maximum value of the transfer speed after the change when the maximum value of the transfer speed is changed by the setting means And writing means for writing the data into the storage means.

According to this structure, the setting means sets the maximum value of the transfer speed to the drive means for driving the transfer means within the set maximum value of the transfer speed, and then, for example, the transfer by the transfer means is performed. When the transfer is not normally performed, the maximum value of the transfer speed is changed to, for example, a low value. The writing means writes the maximum value of the changed transfer speed in the storage means. The maximum value of the transfer speed written by the writing unit is set to the drive unit when the transfer operation is executed in the disk device, and as a result, the maximum value of the transfer speed stored in the storage unit is set. The number of retries of the transfer operation can be suppressed as compared with the case where the maximum value of the transfer speed before the change is set in the driving unit.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. A. This Embodiment (1) Configuration of Embodiment FIG. 1 is a diagram showing the configuration of a disk device 300 according to this embodiment. Since the structure of the optical pickup transfer mechanism shown in FIG. 1 is the same as that of the optical pickup transfer mechanism shown in FIG. 6, the corresponding parts are designated by the same reference numerals and the description thereof will be omitted. The optical pickup 310 is an EFM (Eight to Fourteen) supplied from a data encoder (not shown).
Modulation) A laser beam is emitted in accordance with the modulated recording data to write the recording data to the disc 10, and the return beam of the laser beam emitted to the disc 10 is output to the decoder 320 as a return optical signal. To do.

The decoder 320 is an optical pickup 310.
The return optical signal supplied from the device is demodulated and the like, and the address information indicating the current position of the optical pickup 310 on the disk 10 (hereinafter, simply referred to as the current address) is acquired. As a method of acquiring the current address, for example, a method of acquiring the current address by using a wobble signal obtained by irradiating the guide groove (pre-groove) of the disk 10 and subcode information added to the recording data are used. There is a method of acquiring the current address by using the method, a method of acquiring the current address by using the ATIP (Absolute Time In Pre-Groove) information recorded in advance on the disk 5, and which method is to be adopted? Can be appropriately selected according to the design of the disk device 300 and the like.

The control unit 330 has a CPU (Central Process).
sing unit), ROM (Read Only Memory) and RA
RO, which is composed of M (Random Access Memory) etc.
The disk device 3 according to the program stored in M
In addition to controlling each part of 00 centrally, it also performs seek operation control. More specifically, when the control unit 330 receives a seek operation start command including a target address corresponding to the transfer destination of the optical pickup 310 from the host computer or the like, the control unit 330 accesses the non-volatile memory 335 and operates the stepping motor 100 during the seek operation. While reading the information indicating the maximum rotation speed (hereinafter simply called the maximum rotation speed),
Calculate the number of pulses to give to the stepping motor 100,
These are notified to the controller 340.

FIG. 2 is a diagram for explaining the nonvolatile memory 335. The non-volatile memory 335 is a memory for storing the above-mentioned maximum rotation speed and the like.
ROM (Electrionically Erasable and Programmable
Read Only Memory), flash memory, OUM (Ovon
ics Unified Memory), FeRAM and the like. An initial value of the maximum rotation speed (hereinafter, referred to as an initial rotation speed V0) is stored in advance in the non-volatile memory 335, and thereafter, the maximum rotation speed stored in the non-volatile memory 335 is determined by the stepping motor 100. It is sequentially updated according to the key detection result. The nonvolatile memory 3
Details of the rewriting operation of the maximum rotation speed stored in 35 will be clarified in the section of the operation description of the embodiment.

Returning to FIG. 1, the controller 340 generates a pulse based on the number of pulses and the maximum rotation speed notified from the control unit 330, and outputs this to the driver 350. The frequency of the pulse generated by the controller 340 is limited to the frequency of the pulse corresponding to the rotation speed equal to or lower than the notified maximum rotation speed.

The driver 350 is responsive to the pulses supplied from the controller 340 to drive the stepping motor 100.
The rotational speed and the rotational speed of the optical pickup are controlled to transfer the optical pickup 310 from the position corresponding to the current address to the position corresponding to the target address. The seek operation of the disk device 300 according to this embodiment will be described below with reference to FIG.

(2) Operation of Embodiment When the disk 10 is mounted on the disk device 300 and the disk device 300 is powered on, the optical pickup transfer mechanism operates the optical pickup 310 under the control of the controller 330. For example, the disc 10 is transferred to a position corresponding to the innermost circumference (referred to as a reference position for convenience). After that, the user operates the operation unit (not shown) such as the host computer.
When the user inputs an instruction to start writing the recording data, the host computer obtains a target address corresponding to the transfer destination of the optical pickup 310 from the contents of the input operation and starts a seek operation including the obtained target address. The command is sent to the disk device 300.

When the seek operation start command is received from the host computer 400, the control unit 330 of the disk device 300 activates the seek operation control program stored in the ROM and executes the seek operation control processing described below.

FIG. 3 is a diagram showing a processing flow of seek operation control processing. When the control unit 330 receives the seek operation start command from the host computer 400 (step S1), it accesses the nonvolatile memory 335 and sets the maximum rotation speed (that is, the initial maximum rotation speed) stored in advance in the nonvolatile memory 335. V0) is read, and the optical pickup 310 is read from the current address (here, the reference position) of the optical pickup 310 supplied from the decoder 320 and the target address included in the seek operation start command. The distance to be moved in the radial direction of 10 is obtained, and the number of pulses to be supplied to the stepping motor 100 is calculated from the obtained distance (step S2 → step S3). The control unit 330 notifies the controller 340 of the initial maximum rotation speed V0 and the number of pulses thus obtained (step S4).

The controller 340 generates a pulse to be supplied to the stepping motor 100 based on the number of pulses notified from the control section 330 and the initial maximum rotation speed V0, and outputs this to the driver 350. Driver 350
Controls the rotation speed and rotation speed of the stepping motor 100 according to the pulse supplied from the controller 340 in order to move the optical pickup 310 from the current position (here, the reference position) to the position corresponding to the target address.

After that, when the controller 330 detects that the transfer operation of the optical pickup 310 is completed, it turns on a tracking servo (not shown). When the tracking servo is turned on, the decoder 320 acquires the current address indicating the current position of the optical pickup 310 by demodulating the wobble signal, for example, and outputs this to the control unit 330.

When the control unit 330 receives the current address from the decoder 320 (step S5), it calculates the difference between the received current address and the target address received from the host computer or the like at the start of the seek operation (hereinafter, referred to as position shift amount). The calculated amount of positional deviation and the disk device 3 in advance
The positional deviation allowable amount Δ set to 00 is compared (step S6). The positional deviation allowable amount Δ is information for determining whether or not the stepping motor 100 is out of step, and is set in the disk device 300 at the time of factory shipment, for example.

For example, the control section 330 determines that the obtained positional deviation amount is equal to or less than the positional deviation allowable amount Δ and that the stepping motor 100 is not out of step (step S).
6; YES), the process proceeds to step S7, and it is determined whether the maximum rotation speed of the stepping motor 100 has been changed. As will be described later in detail, in the present embodiment, when the step-out is detected during the seek operation, the maximum rotation speed of the stepping motor 100 is set low and the seek operation is retried. Here, since the optical pickup 310 could be moved to the vicinity of the target track without retrying the seek operation, the control unit 330 determines “NO” and ends the seek operation control process described above.

On the other hand, the control unit 330 determines that the stepping motor 100 is out of step because, for example, the obtained positional deviation amount exceeds the positional deviation allowable amount Δ (step S).
6; NO), in order to retry the seek operation, the maximum rotation speed of the stepping motor 100 (for convenience, referred to as maximum rotation speed V1) was set at the previous seek operation.
After setting the value lower than 0) (see FIG. 4), the distance to move the optical pickup 310 at the time of retry is calculated, and the number of pulses to be supplied to the stepping motor 100 is calculated from the calculated distance (step S9).

The reason why the maximum rotation speed of the stepping motor 100 is set low during the retry of the seek operation is to suppress the occurrence of step-out of the stepping motor 100. Normally, when the frequency of the pulse given to the stepping motor 100 is set high (that is, when the maximum rotation speed of the stepping motor 100 is set high), the above-mentioned step-out easily occurs, while the pulse given to the stepping motor 100 is likely to occur. When the frequency is set low (that is, when the maximum rotation speed of the stepping motor 100 is set low), the occurrence of step-out is suppressed. In the present embodiment, such a stepping motor 1
By utilizing the characteristics of 00, the number of retries of the seek operation is suppressed.

The control unit 330 controls the maximum rotation speed V1 (<V of the stepping motor 100 as described above.
0) is set and the number of pulses to be supplied to the stepping motor 100 is calculated, the process returns to step S4,
These are notified to the controller 340. Control unit 330
After that, the processes of step S5, step S6, step S9, and the like are repeatedly executed until step out of the stepping motor 100 is no longer detected.

While the series of processes are repeatedly executed, the control unit 330 determines that the obtained positional deviation amount is less than the positional deviation allowable amount Δ and that the stepping motor 100 is not out of step ( Step S6; YES),
In step S7, it is determined whether the maximum rotation speed of the stepping motor 100 has been changed. Here, since the optical pickup 310 is moved to the vicinity of the target track by retrying the seek operation, for example, several times, the control unit 330 determines “YES” and proceeds to step S8.

The control section 330, in step S8,
The maximum rotation speed set in the stepping motor 100 at that time (for example, the maximum rotation speed V4; FIG.
(See FIG. 2) is newly written in the non-volatile memory 335 to update the maximum rotation speed stored in the non-volatile memory 335 (see FIG. 2), and the seek operation control process described above ends. The operation after executing the seek operation control process can be explained almost in the same manner as in the existing disk device, and therefore will be omitted.

When the user confirms that the writing of the record data to the disk 10 is normally completed by referring to the display unit (not shown) of the host computer, he or she operates the operation switch (not shown), The power of the disk device 300 is turned off. After that, the user uses, for example, a disc different from the disc 10 for the disc device 300.
After turning on the power supply of the disk device 300 again, the controller 330 of the disk device 300 causes the controller 330 of the disk device 300 to The seek operation control process described above is executed again.

Upon receiving the seek operation start command from the host computer or the like, the control section 330 accesses the non-volatile memory 335 and reads out the maximum rotation speed stored in the non-volatile memory 335, as in the case described above ( Step S2). In this case, the nonvolatile memory 335
Stores not the initial maximum rotation speed V0 but the maximum rotation speed V4 of the stepping motor 100 when step out is no longer detected by retrying the seek operation. When the control unit 330 acquires the maximum rotation speed V4 from the nonvolatile memory 335, the control unit 330 proceeds to step S3 and calculates the number of pulses to be supplied to the stepping motor 100.

As described above, by setting the maximum rotation speed V4 of the stepping motor 100 when the step-out is no longer detected by retrying the seek operation, the stepping motor 1 is always set.
Compared with the case where the maximum rotation speed of 00 is set to the initial maximum rotation speed V0 and the seek operation is started, retries are less likely to occur, and stable operation can be immediately obtained. The operation after this can be explained in almost the same manner as the above-mentioned case, and therefore will be omitted.

As is clear from the above description, according to the disk device 300 of the present embodiment, the non-volatile memory 3 for storing the maximum rotation speed of the stepping motor 100.
Reference numeral 35 indicates the maximum rotation speed of the stepping motor 100 when step out is no longer detected by retrying the seek operation (for example, maximum rotation speed V4; see FIG. 2).
Is stored. As is well known, the information stored in the non-volatile memory 335 is stored in the OF when the power supply of the disk device 300 is OFF.
The nonvolatile memory 335 still remains after the
Held in. Therefore, for example, after the maximum rotation speed V4 is stored in the nonvolatile memory 335, the disk device 30
0 is turned off and then turned on again, the control unit 330 of the disk device 300 causes the non-volatile memory 335 to operate.
The maximum rotation speed V4 held at is read and set as the maximum rotation speed of the stepping motor 100. Therefore, the maximum rotation speed of the stepping motor 100 is always a constant value (for example, the initial maximum rotation speed V0;
Compared with the case where the seek operation is started by setting (see), retry is less likely to occur (in other words, the number of retries can be reduced), and stable operation can be immediately obtained.

In the present embodiment described above, the optical pickup transfer mechanism including the stepping motor 100 and the lead screw 110 (for details, see the section of the prior art) has been described as an example, but the present invention is not limited to this. The present invention is not limited to this, and can be applied to a transfer mechanism or the like that drives the stepping motor 100 with gears.

(3) Modifications Although one embodiment of the present invention has been described above, the above embodiment is merely an example, and various modifications may be made to the above embodiment without departing from the spirit of the present invention. Can be added. For example, the following may be considered as modifications.

<Modification 1> In the disk device 300 according to this embodiment described above, the maximum rotation speed of the stepping motor 100 at the end of the seek operation is the nonvolatile memory 3.
When the maximum rotation speed stored in the non-volatile memory 335 is different from the maximum rotation speed stored in the non-volatile memory 335, the maximum rotation speed of the stepping motor 100 at the end of the seek operation is changed. Even if the maximum rotation speed stored in the non-volatile memory 335 is different, the maximum rotation speed stored in the non-volatile memory 335 is not updated, and the past N (≧
1) The maximum rotation speeds of the stepping motors 100 at the end of the seek operation for the number of times are compared, and it is determined whether or not the maximum rotation speed stored in the non-volatile memory 335 should be updated based on the comparison result. good.

FIG. 5 is a diagram exemplifying a storage state of the non-volatile memory 335 in which the maximum rotation speed management table TA according to the modified example 1 is stored. The non-volatile memory 335 stores a storage area (hereinafter, referred to as a storage area a) for storing the maximum rotation speed read by the control unit 330 at the start of the seek operation and a storage area for storing the maximum rotation speed management table TA (hereinafter, referred to as a storage area). , Storage area b) and the like.

In the maximum rotation speed management table TA stored in the memory area b, for example, the maximum rotation speed of the stepping motor 100 at the end of the past N (≧ 1) seek operations is registered. Controller 33 of disk device 300
As in the case of the present embodiment described above, when the seek operation is started, 0 reads out the maximum rotation speed (for example, the initial maximum rotation speed V0) stored in the storage area a of the nonvolatile memory 335 (shown in FIG. 5). , A), and notifies this to the controller 340. After that, when the control unit 330 retries the seek operation several times and finishes the seek operation, the stepping motor 100 set at that time point.
The highest rotation speed (for example, the highest rotation speed V4) is registered in the highest rotation speed management table TA stored in the storage area b (see B in FIG. 5).

Thereafter, the control section 330 repeatedly executes the above-mentioned processing every time the seek operation is performed, and when the N-th seek operation is completed, it is registered in the maximum rotation speed management table TA stored in the storage area b. By referring to each maximum rotation speed (see C in FIG. 5), it is determined whether or not to update the maximum rotation speed stored in the storage area a. For example, all the maximum rotation speeds registered in the maximum rotation speed management table TA are the same maximum rotation speed V4 (see FIG. 5).
If the maximum rotation speed stored in the storage area a is to be updated, the control unit 330
Is the initial maximum rotation speed V0 stored in the storage area a.
Is updated to the maximum rotation speed V4 (see D in FIG. 5).

Thus, the maximum rotation speeds of the stepping motor 100 at the end of the past N seek operations are compared, and the maximum rotation speed stored in the storage area a of the non-volatile memory 335 is updated based on the comparison result. By determining whether or not to do so, it is possible to suppress an adverse effect such as setting the maximum rotation speed unnecessarily low. Here, a case where the step-out occurs will be explained. In addition to the case where the stepping occurs due to the deterioration of the stepping motor 100 over time, the case where the step-out occurs suddenly due to the dust or the like adhering to the disk 10. To be If the maximum rotation speed stored in the storage area a is constantly updated in consideration of this sudden step-out, the performance of the disk device 300 will be degraded, and there is a demand for a faster seek operation. I can't answer.

Therefore, in the present modified example, as described above, for example, from the maximum rotation speed of the stepping motor 100 at the end of the past N seek operations, is there a sudden step out (for example, only one is the maximum)? If the rotation speed is different) or if step out occurs due to the deterioration of the stepping motor over time (for example, if all the maximum rotation speeds are the same), determine whether the stepping motor has deteriorated over time. The maximum rotation speed stored in the storage area a is updated only when it is determined that step-out has occurred. It should be noted that how many past seek operations at the end of the seek operation should be used to make the determination, how to set the criteria for making the determination, etc. Of the rotation speed, (N-
3) Only when the maximum rotation speeds of more than 3 are the same,
The maximum rotation speed stored in the storage area a) can be changed as appropriate according to the design of the disk device 300 and the like.

Further, in the present modified example described above, the maximum rotation speed (for example, the maximum rotation speed V4) of the stepping motor 100 set at that time is stored in the storage area b after each seek operation. Was,
The maximum rotation speed of the stepping motor 100 is, for example, the maximum rotation speed when the maximum rotation speed is set to be the lowest among the plurality of seek operations performed from the time when the power of the disk device 300 is turned on to the time when the power is turned off. N stored in the storage area b and accumulated in the storage area b when the power ON / OFF operation of the disk device 300 is performed N times
It is also possible to compare the individual maximum rotation speeds and determine whether to update the maximum rotation speed stored in the storage area a based on the comparison result.

<Modification 2> In the above-described embodiment and modification 1, the case where the maximum rotation speed of the stepping motor 100 is decreased has been described as an example. However, when the maximum rotation speed of the stepping motor 100 is increased. It is also applicable to. Taking the first modification as an example, for example, the stepping motor 100 at the end of the seek operation for the past N times is performed.
From the maximum rotation speed of the initial maximum rotation speed V0 to the maximum rotation speed V4 stored in the storage area a.
Although updated to (<V0), in a subsequent seek operation (for example, 10 * N seek operations), if no retry occurs, the control unit 330 determines the result of the seek operation. Based on this, the operation of returning the maximum rotation speed stored in the storage area a from the maximum rotation speed V4 to the initial maximum rotation speed V0 again is performed. Thus, not only when decreasing the maximum rotation speed of the stepping motor 100,
When the predetermined condition is satisfied, the maximum rotation speed of the stepping motor can be increased (for example, returned to a preset maximum rotation speed). Also in this modification, as in the case of Modification 1 described above, conditions for increasing the maximum rotation speed of the stepping motor 100, etc. (for example, the seek operation is normally completed without repeatedly generating retries). It is possible to appropriately change how to set such as) according to the design of the disk device 300 and the like.

<Modification 3> Further, in the above-described present embodiment, the stepping motor 10 at the end of the seek operation.
If the maximum rotation speed of 0 is different from the maximum rotation speed stored in the non-volatile memory 335,
Although the maximum rotation speed stored in 35 is constantly updated, for example, the maximum rotation speed of the stepping motor 100 at the end of the seek operation and the non-volatile memory 33.
The non-volatile memory 335 is obtained by obtaining the difference D of the maximum rotation speed of the stepping motor 100 stored in No. 5 and determining whether the difference D exceeds a threshold value stored in advance in the ROM or the like. It may be determined whether to update the maximum rotation speed of the stepping motor 100 stored in.

For example, when the obtained difference D exceeds the threshold value, it is considered that the step-out has suddenly occurred due to the dust accumulated on the disk 10, and the nonvolatile memory 3
If the maximum rotation speed of the stepping motor 100 stored in No. 35 is not updated and the obtained difference D is less than or equal to the threshold value, the stepping motor 100 is out of step due to deterioration over time. And the stepping motor 100 stored in the non-volatile memory 335.
The maximum rotation speed of is updated. It should be noted that what value to set the threshold value and the like can be appropriately changed according to the design of the disk device 300 and the like. Further, it goes without saying that this modification can be applied to each of the modifications described above.

<Modification 4> In Modification 3, the stepping motor 10 at the end of the seek operation is also used.
0 maximum rotation speed and non-volatile memory 3 at that time
35, the difference D of the maximum rotation speed of the stepping motor 100 stored in 35 is determined, and whether or not the maximum rotation speed of the stepping motor 100 stored in the non-volatile memory 335 is updated using the difference D. Although the case has been described, the stepping motor 100 stored in the non-volatile memory 335 is detected by detecting the usage environment of the disk device 300 and using the detection result.
It may be determined whether or not the maximum rotation speed of is updated.

For example, temperature detecting means for detecting the ambient temperature of the disk device 300 as means for detecting the use environment,
A voltage detecting means for detecting the power supply voltage of the disk device 300, a time measuring means for detecting the total usage time of the disk device 300 (for example, how many years have passed since the disk device 300 was purchased, etc.) are provided, and the detecting means etc. The non-volatile memory is only when the detection result by the CPU matches the maximum rotation speed update condition (for example, ambient temperature; a or less, power supply voltage; b or less, total usage time; c or more) stored in the ROM or the like. The maximum rotation speed stored in 335 is updated. It should be noted that how to set the maximum rotation speed updating condition can be appropriately changed according to the design of the disk device 300 and the like. Further, the temperature detecting means, the voltage detecting means, the time measuring means, and the like described above are merely examples, and any detecting means capable of detecting an environment where out-of-step is likely to occur can be used.

<Fifth Modification> Further, in the disk device 300 according to the present embodiment described above, as shown in FIG. 3 above, by repeatedly retrying the seek operation, the obtained positional deviation amount is the positional deviation allowable amount Δ. If the following occurs, the maximum rotation speed set in the stepping motor 100 at that time is written in the non-volatile memory 335 (step S6 → step S7 → step S).
8) The timing at which the maximum rotation speed is written in the non-volatile memory 335 can be arbitrarily changed. For example, each time the seek operation is retried, the maximum rotation speed set in the stepping motor 100 at that time may be sequentially written in the non-volatile memory 335. Further, the maximum rotation speed of the stepping motor 100 at the end of the seek operation is R until the command to turn off the power of the disk device 300 is input.
Store it in AM, etc.
The latest maximum rotation speed stored in AM or the like may be written in the non-volatile memory 335.

More specifically, after the power supply of the disk device 300 is turned on, until the host computer or the like issues a command to turn off the power supply to the control unit 330, a constant maximum rotation speed (for example, , Initial maximum rotation speed V0) is held in the non-volatile memory 335. After that, when the command is sent from the host computer or the like to the control unit 330, the control unit 330 reads the latest maximum rotation speed (for example, the maximum rotation speed V4) stored in the RAM or the like, and reads this out. After writing to 335, power supply to each unit of the disk device 300 is cut off. As a result, the maximum rotation speed V4 is read from the non-volatile memory 335 when the seek operation is performed for the first time after the power of the disk device 300 is turned off and then turned on again. In this way, the maximum rotation speed stored in the non-volatile memory 335 may be updated immediately before the power is turned off.

<Modification 6> Further, although the disk device 300 according to the present embodiment described above has a configuration in which the maximum rotation speed is stored in the non-volatile memory 335, a power source backup function is used instead of the non-volatile memory 335. It is also possible to use an attached volatile memory or the like. In addition, although the use is limited, a volatile memory (RAM that does not have a power backup function instead of the nonvolatile memory 335) is used.
Etc.) can also be used. For example, when the seek operation is repeatedly executed while the power is kept ON, the maximum rotation speed of the stepping motor 100 at the end of the seek operation is stored in the volatile memory, and is stored in the volatile memory at the next seek operation. Read the maximum rotation speed. As described above, in the case where the seek operation is repeatedly executed with the power source kept ON, it is possible to use a volatile memory instead of the non-volatile memory 335.

<Variation 7> In the above-described embodiment, the case where the allowable displacement amount Δ is preset in the disk device 300 at the time of factory shipment has been described as an example.
It is also possible to store the positional deviation allowance Δ in the RAM, the non-volatile memory 335, or the like and allow the user to arbitrarily set the positional deviation allowance Δ using the operation unit such as the host computer.

<Modification 8> In the above-described embodiment, the case where the recording data is written in the disk 10 has been described as an example. However, when the recording data previously written in the disk 10 is read and reproduced. Is also applicable. The operation relating to the characteristic part of the present invention at the time of reproduction can be explained almost in the same way as the case of writing the record data, and therefore the explanation is omitted.

<Modification 9> In the above-described embodiment, the moving distance of the optical pickup 310 is obtained by using the current address detected by the decoder 320, but it is formed by a photo interrupter or the like. The present invention can also be applied to a disk device or the like that obtains the moving distance of the optical pickup 310 using an encoder (not shown).

<Variation 10> Further, in the above-described embodiment, the description has been made without particularly mentioning the disk 10 as the recording / writing target of the recording data. However, the CD-RW, the CD-R and the DVD are described. -R (Digital Versa
tile Disc Recordable), DVD-RAM (Digital Vers
atile Disc Random Access Memory), PC-RW (Phas
e Change ReWritable) and other optical discs and FDs
(Floppy Disc), MO (Magneto Optical disc), etc. can be applied to any disc device that writes / reads recording data to / from a disc-shaped recording medium.

<Modification 11> Further, the various functions (for example, the seek operation control process shown in FIG. 3) related to the disk device described above can be realized by software. Specifically, it is installed in a disk device from a recording medium (for example, CD-ROM or the like) recording the software, or downloaded from a server equipped with the software via a network (for example, the Internet), and a host computer or the like. To the disk device via. In this way, it is possible to realize the above-mentioned functions by software. It goes without saying that the above-described modifications can be applied to different modifications.

[0055]

As described above, according to the present invention,
It is possible to suppress the number of retries of the transfer operation.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a disk device according to an embodiment.

FIG. 2 is a diagram for explaining the nonvolatile memory according to the same embodiment.

FIG. 3 is a flowchart showing a seek operation control processing flow according to the embodiment.

FIG. 4 is a diagram illustrating the relationship between the number of retries and the maximum rotation speed according to the embodiment.

FIG. 5 is a diagram exemplifying a maximum rotation speed management table according to Modification 5;

FIG. 6 is a diagram for explaining an optical pickup transfer mechanism.

[Explanation of reference numerals] 300 ... Disk device, 100 ... Stepping motor, 310 ... Optical pickup, 320 ... Decoder, 330 ... Control unit, 335 ... Non-volatile memory, 340 ... -Controller, 350 ... driver, 10 ... disk.

Claims (5)

[Claims] 1. An optical pickup, a transfer means for transferring the optical pickup in a radial direction of a disk-shaped recording medium, a drive means for driving the transfer means within a set maximum value of a transfer speed, Even when the power of the disk device is cut off,
Storage means for holding the written maximum value of the transfer speed, a function for setting the maximum value of the transfer speed in the drive means when the transfer operation is executed by the transfer means, and a transfer speed set in the drive means. A setting means having a function of changing the maximum value, and a writing means for writing the changed maximum value of the transfer speed in the storage means when the maximum value of the transfer speed is changed by the setting means, The setting means sets the maximum value of the transfer speed stored in the storage means to the drive means when a transfer operation is executed for the first time after the disk device is powered on. Disk device. 2. The setting means, when the transfer operation is executed by the transfer means, has a function of setting the maximum value of the transfer speed in the drive means and the transfer operation is retried without being normally performed. The disk device according to claim 1, further comprising a function of changing the maximum value of the transfer speed set in the drive means. 3. The writing means stores the changed maximum value of the transfer speed in the storage means when the maximum value of the transfer speed is changed by the setting means and the transfer operation is normally performed. The disk device according to claim 1, wherein writing is performed. 4. The storage means holds the maximum value of a plurality of written transfer speeds even when the power supply of the disk device is shut off, and the writing means holds the maximum transfer speed by the setting means. When the value is changed and the transfer operation is normally performed, the maximum value of the changed transfer speed is written in the storage unit, and the setting unit, after the power is turned on to the disk device, When the transfer operation is executed for the first time, the maximum value of the transfer speeds having the largest number of coincidences is set in the drive means from among the maximum values of the transfer speeds stored in the storage means. The disk device according to claim 1 or 2. 5. An optical pickup, a transfer means for transferring the optical pickup in a radial direction of a disk-shaped recording medium, a drive means for driving the transfer means within a set maximum value of a transfer speed, and a transfer means. Storage means for holding the maximum value of the speed, and a function for setting the maximum value of the transfer speed stored in the storage means to the drive means when the transfer operation is executed by the transfer means, and to the drive means Setting means having a function of changing the maximum value of the transfer speed, and writing means for writing the changed maximum value of the transfer speed to the storage means when the maximum value of the transfer speed is changed by the setting means. A disk device comprising: