JP2005141801A - Initial position determining method of stepping motor and disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine the initial position of a stepping motor without providing an extra sensor, and moreover to also reduce the number of times for determining the initial position. <P>SOLUTION: A disk device is provided with a pickup head 12 which is used to write or to read information to and from a disk 11, a stepping motor 13 which is used to drive the pickup head 12 to a prescribed position on the disk 11, a storage device 16 which stores the positional information of the pickup head 12, immediately prior to the exchange operation of the disk 11 is caused, or immediately before turning off the power supply of the disk device, and a controller 14 which controls the stepping motor 12, on the basis of the positional information of the pickup head 12 stored in the storage device 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stepping motor initial position determination method and a disk device.

Optical disc media are CD, CD-R, CD-RW, CD-RAM, DVD, DVD
In recent years, a large number of standards such as -R, DVD-RW, and DVD-RAM have been defined.
Furthermore, it is expected that new standards such as blue DVD will be established in the future.

A reproduction apparatus for reproducing optical disk media uses a stepping motor for moving an optical head to a desired position on the optical disk medium.

A major problem in using a stepping motor is determining the initial position of the stepping motor. Conventional stepping motors do not use Hall elements to determine whether the motor is driving, in order to reduce costs. Therefore, there is no means for detecting whether the stepping motor is driven or locked, and in some cases, the stepping motor is operated for a few seconds while being locked, and abnormal noise is generated from the mechanical system. There are things to do.

In order to avoid the locking of the stepping motor, a method to detect the position before locking by providing a sensor that monitors the driving state of the stepping motor can be considered, but the cost increases by providing this sensor. There is a problem of doing.
Japanese Patent Laid-Open No. 7-105642

Thus, conventionally, in order to grasp the driving state of the stepping motor, providing the sensor has a problem that the cost of the apparatus increases.

The present invention has been made to solve the above-described problem, and determines the initial position of the stepping motor that can determine the initial position of the stepping motor and reduce the number of times to determine the initial position without providing an extra sensor. It aims to provide a method.

In order to achieve the above object, the present invention includes a step of storing position information of a pickup head in a storage device immediately before a disk replacement operation occurs, and the stored position information of the pickup head after the disk is replaced. And a step of controlling the stepping motor based on the stepping motor initial position determination method.

The present invention also provides a pickup head for reading information from a disk or writing information on a disk,
A stepping motor for moving the pickup head to a predetermined position of the disk;
A storage device for storing position information of the pickup head immediately before the disk replacement operation occurs;
And a control device for controlling the stepping motor based on positional information of the pickup head stored in the storage device after the disk is replaced.

The present invention also includes a step of storing the position information of the pickup head in the storage device immediately before the apparatus is turned off, and the position information of the pickup head stored after the apparatus is turned on. And a stepping motor control step. A stepping motor initial position determination method is provided.

The present invention also provides a pickup head for reading information from a disk or writing information on a disk,
A stepping motor for moving the pickup head to a predetermined position of the disk;
A storage device for storing position information of the pickup head immediately before the device is turned off;
And a controller that controls the stepping motor based on positional information of the pickup head stored in the storage device after the power of the device is turned on.

By storing the position information of the pickup head immediately before changing the disk or immediately before turning off the power, the position of the pickup head can be known without moving the pickup head to the initial position after changing the disk or after turning on the power. Therefore, it is possible to follow the position of the subsequent pickup head.

  Hereinafter, this embodiment will be described with reference to the drawings.

  FIG. 1 is a schematic diagram of a disk device according to an embodiment of the present invention.

As shown in FIG. 1, this disk apparatus includes a pickup head (PUH) 12 and a stepping motor 1 for aligning the pickup head 12 on the optical disk.
3, a drive device 14 for driving the stepping motor 13, a control device 15 for controlling the drive device 14, and a storage device 16 for storing information on the initial position of the pickup head 12. .

Using this disk device, the position information of the pickup head 12 is stored in the storage device 16 immediately before the replacement work of the optical disk 11 occurs or immediately before the power of the disk device is turned off. After the optical disk 11 is replaced or the power supply of the disk device is turned on, the stepping motor 13 is controlled by the control device 15 based on the position information of the pickup head 12 stored in the storage device 16 and driven by the drive device 14. To do.

Based on the initial position of the pickup head 12, the position of the pickup head 12 being driven is calculated by the control device 15.

The pickup head 12 can read information from the optical disk 11. Information can be written in the optical disk 11. Read information read from the pickup head 12 is sent to the control device 15, and write information to be written using the pickup head 12 is sent from the control device 15.

  Next, the operation of the present invention will be described using a flowchart with reference to FIG.

First, in the disk device, the control device 15 receives a disk replacement signal by pressing a switch for opening a tray in order to replace the disk by a user operation (S11). Then, the control device 15 performs control to read the current position information of the pickup head 12 (S12).
).

Next, the control device 15 writes the position information of the pickup head 12 in the storage device 16 (S13). Then, the tray is opened and the disk is exchanged (S14).

Next, when the disk is exchanged by the user's operation and the tray is closed, the tray is closed and the control device 15 receives a signal for accessing the disk (S15).

Next, the control device 15 accesses the storage device 16 and reads the position information of the pickup head 12 written therein (S16).

Next, the control device 15 calculates the position information of the destination of the pickup head 12 based on the position information of the pickup head 12 and the address information of the destination to access the disk (S17).

Next, the control device 15 sends a signal indicating the destination of the pickup head 12 to the drive device 14 (S18). Next, the drive unit 14 has this signal to generate the stepping motor 13.
Is driven (S19).

  Next, the operation of the present invention will be described using a flowchart with reference to FIG.

First, in the disk device, the control device 15 receives a power-off signal by pressing an off switch to turn off the device by a user's operation (S21). Then, the control device 15 performs control to read the current position information of the pickup head 12 (S22).

Next, the control device 15 writes the position information of the pickup head 12 in the storage device 16 (S23). Then, the power is turned off (S24).

Next, the user turns on the power and receives a signal to access the disk (
S25).

Next, the control device 15 accesses the storage device 16 and reads the position information of the pickup head 12 written therein (S26).

Next, the control device 15 calculates the position information of the movement destination of the pickup head 12 based on the position information of the pickup head 12 and the address information of the destination to access the disk (S27).

Next, the control device 15 sends a signal indicating the destination of the pickup head 12 to the drive device 14 (S28). Next, the drive unit 14 has this signal to generate the stepping motor 13.
Is driven (S29).

In this way, the control device 15 is given the position of the previous pickup, and can determine the position to be accessed next from this position with this position as an initial state.

In the present invention, a central processing unit such as a CPU can be used as the control device 15.
As the storage device 16, various semiconductor memories or magnetic disks can be used.

In this way, the position information of the pickup head 12 can be determined immediately after the disk is replaced or after the power is turned on regardless of the position of the pickup head 12 on the disk. No drive is required.

1 is a conceptual diagram of a disk device for explaining an embodiment of the present invention. 4 is a flowchart for explaining a stepping motor initial position determining method according to the present invention. 4 is a flowchart for explaining a stepping motor initial position determining method according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Optical disk, 12 ... Pick-up head, 13 ... Stepping motor, 14 ... Drive apparatus, 15 ... Control apparatus, 16 ... Memory | storage device

Claims (4)

Storing the pickup head position information in a storage device immediately before the disk replacement operation occurs, and controlling the stepping motor based on the stored pickup head position information after the disk replacement. A stepping motor initial position determination method characterized by: A pickup head for reading information from a disk or writing information to a disk;
A stepping motor for moving the pickup head to a predetermined position of the disk;
A storage device for storing position information of the pickup head immediately before the disk replacement operation occurs;
And a controller that controls the stepping motor based on positional information of the pickup head stored in the storage device after the disk is replaced. The step of storing the position information of the pickup head in the storage device immediately before the device is turned off, and the step of controlling the stepping motor based on the position information of the stored pickup head after the device is turned on. And a stepping motor initial position determining method. A pickup head for reading information from a disk or writing information to a disk;
A stepping motor for moving the pickup head to a predetermined position of the disk;
A storage device for storing position information of the pickup head immediately before the device is turned off;
And a control device that controls the stepping motor based on positional information of the pickup head stored in the storage device after the power of the device is turned on.

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