JPH04295666A - Adjusting system of repetitive control device - Google Patents

Abstract

PURPOSE:To provide the adjusting system, of a repetitive control device, which adjusts the repetitive control device so as to restrain a cyclic target value or a cyclic disturbance by a method wherein a time delay is changed to a prescribed value according to a change in the cycle of a target value or a disturbance. CONSTITUTION:The type of an optical disk 1 as an object to be controlled is discriminated. The number of its revolutions is controlled according to the discriminated type of the optical disk 1. At this time, the tracking error of the optical disk 1 is stored in a ring buffer and read out; the length of the buffer is changed according to the type of the optical disk 1. Thereby, the repetitive control cycle of the optical disk 1 is changed.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is applicable to repetitive control in a recording/reproducing device that can use interchangeable storage media such as floppy disks or optical disks, and that needs to be rotated at different rotational speeds depending on the type of recording medium. This relates to the adjustment method of the device.

0002

2. Description of the Related Art Repetitive control is known as an effective control method for periodic target values and disturbances, and in recent years, its application to tracking servo devices in optical disk drives has been proposed.

0003

[Problems to be Solved by the Invention] However, in the above conventional example, the number of time delay sections in repetitive control is a predetermined number, so it is difficult to control a device that rotates multiple types of disks at different rotation speeds. could not be used.

The present invention has been made in view of the above conventional example, and it is possible to suppress periodic target values or disturbances by changing the time delay to a predetermined value in accordance with changes in the periodicity of the target value or disturbance. It is an object of the present invention to provide a method for adjusting a repeating control device, which adjusts the repeating control device.

[0005]

[Means for Solving the Problems] In order to achieve the above object, an adjustment system for a repeating control device according to the present invention has the following configuration. That is, it has a determining means for determining the rotating recording medium, and a changing means for changing the repetition period of the repetition control device in accordance with the rotation period of the rotating recording medium determined by the determining means.

[0006]

[Operation] In the above configuration, the repetition period of the repetition control device is operated to be changed in accordance with the rotation period of the rotation recording medium determined by determining the rotation recording medium.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. <Description of Optical Disk Device (FIG. 1)> FIG. 1 is a block diagram showing a schematic configuration of a tracking servo control device for an optical disk device according to an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a storage medium such as an optical disk or a magnetic disk, which is herein referred to as an optical disk. 2 is a motor for rotating the optical disc 1 at a constant speed, and 3 is an optical head that irradiates light onto the optical disc 1 and reads information stored on the optical disc 1 using the reflected light. A disk rotation controller 4 controls the rotation speed of the motor 2 according to the rotation speed instructed by the rotation speed setting device 6. 5 is a disc discriminator for discriminating the type of optical disc 1; 6 is a rotation speed setting device, which determines the rotation speed of the optical disc 1 according to the type of optical disc 1 discriminated by the disc discriminator 5. 7
is an A/D converter which inputs a tracking error signal from a sensor provided in the optical head 3, converts it into A/D, and outputs it. Reference numeral 8 denotes a repetition controller which inputs the tracking error signal input from the A/D converter 7 and stores it in an internal ring buffer, and outputs error information read from the ring buffer to the phase compensator 9. There is. 9 is a phase compensator, 10 is the output of the phase compensator 9 as D/
This is a D/A converter that converts the A signal into a drive signal for a tracking actuator provided in the optical head 3. <Description of Repetition Controller (FIG. 2)> FIG. 2 is a block diagram showing the configuration of the repetition controller 8 of this embodiment.

In the figure, reference numeral 21 denotes a CPU for controlling the entire repeating controller 8 of this embodiment, which is stored in a ROM 22 and executes various controls according to a control program shown in the flowchart of FIG. 22 is a ROM that stores this control program and various data. A RAM 23 is used as a work area for the CPU 21 and temporarily stores various data. This R.A.
M23 includes a start point pointer that stores the start address of the ring buffer 25, which will be described later, an end point pointer that stores the end address thereof, and an update (input/output) pointer that stores the current update position. It is equipped with

Reference numeral 24 denotes an input/output port which inputs the tracking error from the A/D converter 7 and outputs a compensation signal to the phase compensator 9. 25 is a ring buffer composed of RAM etc. 26 is a ring buffer 25
The start address is specified by the start point pointer mentioned above. Reference numeral 27 indicates an address designated by the update pointer, from which the next phase compensation data is read, and at which the next tracking error information input from the A/D converter 7 is stored. 28 is
For example, when optical disk 1 is of type A, ring buffer 2
5, and 29 indicates the final address of the ring buffer 25 when the optical disk 1 is of a type different from the A type, for example.
shows the final address.

With the above configuration, when the disk A is loaded while the disk 1 is not loaded, the disk A is rotated at a predetermined number of revolutions, and the disk discriminator 5 uses the information read from the optical head 3 to detect the disk. , determines the type of the loaded disc. Based on this determination result,
The rotation speed setting device 6 outputs data indicating a predetermined rotation speed to the disk rotation control section 4 and the repetition controller 8. Thereby, the disk rotation controller 4 controls the rotation speed of the motor 2 so that the disk 1 rotates at the rotation speed instructed by the rotation speed setting device 6. Further, the repetition controller 8 determines that the input/output address of the ring buffer 25 is a start address 26 indicated by the start point pointer and an end address 28 of the disk A indicated by the end pointer based on the output of the rotation speed setting device 6. controlled to move between.

Here, when disk A is taken out and disk B is loaded, the disk discriminator 5 similarly discriminates the type of the loaded disk, and the rotation speed setting device 6 sets a predetermined rotation speed value. Output. Further, the repetition controller 8 is controlled based on the output of the rotation speed setting device 6 so that the update pointer moves between the start address 26 and the end address 29 of the disk B.

[0013] With this configuration, it becomes possible to repeatedly control a plurality of types of disks that are rotated at different rotational speeds. <Explanation of Operation of Repetition Controller (FIG. 3)> FIG. 3 is a flowchart for explaining the operation of the repetition controller 8. A control program that executes this process is stored in the ROM 22.

This process starts when the device is powered on. First, in step S1, the start point pointer and update pointer of the RAM 23 are set to the start address 2 of the ring buffer 25.
Set to 6. Next, the process advances to step S2, and the type of the loaded disc 1 is determined. If it is disk A, proceed to step S3 and save the value of the end point pointer to ring buffer 2.
5 address (Adr A) to 28. On the other hand, if it is disk B, the process advances to step S4, and the value of the end point pointer is set to address (Adr B) 29 of the ring buffer 25.

In step S5, the process waits for the tracking error to be input from the A/D converter 7, and when the tracking error is input, the process advances to step S6. Step S
6 reads data from the address of the ring buffer 25 indicated by the update pointer and outputs it to the phase compensator 9. Thereby, tracking in the optical head 3 is adjusted by the analog signal output from the D/A converter 10.

Next, the process proceeds to step S8, and the tracking error data inputted from the A/D converter 7 is stored at the address indicated by the update pointer, and the value of the update pointer is incremented by 1 in step S9. Next, the process proceeds to step S10, and it is checked whether the value of this update pointer is equal to or greater than the value of the end pointer, and if not, the process returns to step S2 and the above-described process is executed. If the condition is satisfied in step S10, the process proceeds to step S11, where the value of the update pointer is set to the value of the starting point pointer.

[0017] As described above, by changing the number of addresses for storing and referencing error data according to the type of disk, the read cycle can be changed and it is now possible to handle disks with different rotational speeds. .

Although the embodiment described above relates to repetitive control of a tracking servo system in an optical disc device, this technique can also be used for a focus servo system. Further, the present invention can be applied not only to optical disks and magnetic disks, but also to the case where repetitive control is applied to rotating recording media such as floppy disks, position control and speed control of motors, etc.

The operation of the repeat controller is shown in FIGS. 4 and 5.
As shown in FIG. 3, steps S2 to S4 in FIG. 3 are treated as interrupt processing generated by the disk device, and step S
The portions from 5 to S11 may be executed by periodically generating an interrupt.

Further, in this embodiment, the tracking servo system is realized by digital control, but only the repetition controller may be realized by digital elements, and the rest by analog elements.

As explained above, according to this embodiment, by changing the reading cycle of the ring buffer 25 according to the type of disk with a different rotation speed, it is possible to perform repetitive control even if the cycle of the controlled object is changed. It can be carried out.

[0022]

As explained above, according to the present invention, periodic target values or disturbances can be suppressed by changing the time delay to a predetermined value in accordance with changes in the period of the target value or disturbance. There is an effect that can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a repetition control device in a tracking servo system of an optical disc device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a repetition controller of this embodiment.

FIG. 3 is a flowchart showing the processing operation of the repeat controller of this embodiment.

FIG. 4 is a flowchart showing processing operations of a repeat controller in another embodiment.

FIG. 5 is a flowchart showing processing operations of a repeat controller in another embodiment.

[Explanation of symbols]

1 Optical disc 2 Motor 3. Optical head 4 Disk rotation controller 5 Disc discriminator 6 Rotation speed setting device 7 A/D converter 8 Repetition controller 9 Phase compensator 10 D/A converter 21 CPU 22 ROM 25 Ring buffer

Claims (1)

[Claims] Claim 1: Discrimination means for discriminating a rotating recording medium;
A method for adjusting a repeat control device, comprising: changing means for changing a repeat period of the repeat control device according to the rotation period of the rotating recording medium determined by the determining means.