JP2010262710A - Device, and method for controlling motor drive, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive control device, a motor drive control method, and a program by which appropriate control is performed when step-out of a stepping motor is detected. <P>SOLUTION: In a motor drive control device including a stepping motor for driving an actuator, the actuator is drive-controlled by driving the stepping motor based on a predetermined profile, step-out of the driven stepping motor is detected, switching of the profile is not performed when step-out is detected, amplitude is made the maximum by improving a drive current value, control is performed to seek. Also, when step-out is detected again, seek is completed by switching to the latest profile, when seek is performed next, control is performed to seek by switching to profile being later by one than profile set when step-out is detected, and control is performed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a motor drive control device, a motor drive control method, and a program.

  2. Description of the Related Art Conventionally, for example, a disk reproducing device is known as a device (motor drive control device) that performs motor drive control with pulses. This disk reproducing apparatus is an optical pickup that irradiates a recording surface of an optical disk such as a CD (Compact Disk), a DVD (Digital Versatile Disk), an HDDVD (High Definition DVD), and a Blu-ray Disc, and obtains the reflected light. And information recorded on the optical disc is acquired based on the output from the optical pickup.

  Tracks are formed along the circumferential direction on the recording surface of the optical disc described above, and the disc reproducing apparatus irradiates the recording surface of the optical disc with a quadrant photo detector (QPD) provided in the optical pickup. The reflected light of the light beam is detected.

  The optical pickup detects the step-out of the motor that controls the driving of the optical pickup by detecting the address of the landing point during the jump operation of the optical pickup and looking at the difference from the target address.

  When a stepping motor is used as a seek motor for driving the optical pickup described above in the radial direction of the optical disc, control based on the profile is performed. When stepping motor step-out occurs while performing drive control based on a specific profile, it has been dealt with by switching to a profile with slower operation and performing seek control. This will be described with reference to FIG.

FIG. 5 is a flowchart showing an example of seek control processing performed in the disk reproducing apparatus according to the prior art.
As shown in FIG. 5, in step S201, the profile A is activated and seek control is started. A profile is a drive pattern represented by the relationship between the time required for one seek control performed in the disk reproducing apparatus and the pulse rate. Here, there are five types of profiles, A (fastest) to E (slowest), and the time required for seek control increases from A in order.
In step S202, it is determined whether or not the stepping motor has stepped out. When the stepping motor has stepped out, the process proceeds to the next step S203, and when the stepping motor has not stepped out, the process proceeds to step S206.

In step S203, the amplitude is increased by increasing the drive current value. Increasing the amplitude increases the motor torque, making it difficult to step out.
In step S204, it is determined whether or not the stepping motor has stepped out. When the stepping motor has stepped out, the process proceeds to the next step S205, and when the stepping motor has not stepped out, the process proceeds to step S206.

In step S205, the profile E is activated. When the profile E is activated, the process proceeds to step S204.
In step S206, seek control is completed. When the seek control is completed, the process proceeds to step S201.

  For example, the techniques described in Patent Documents 1 and 2 disclose techniques that make it possible to speed up and stabilize a seek in an optical pickup by switching the time required for seek control as in the method described above.

JP 2002-329334 A Japanese Patent Laid-Open No. 8-190771

  However, even if the above-described method is used, when the stepping motor steps out, the slowest profile (seek time) is activated and seek control is resumed, so seek control is performed based on a profile that is slower than necessary each time. Will be deceived.

  It is an object of the present invention to provide a motor drive control device, a motor drive control method, and a program that perform appropriate control when a stepping motor step-out is detected.

  The invention described in claim 1 is made to achieve the above object, and in a motor drive control device including a stepping motor for driving an actuator, the stepping motor is controlled based on a preset profile. A drive control means for driving and controlling the actuator by driving, a step-out detection means for detecting a step-out of the stepping motor driven by the drive control means, and a step-out detection by the step-out detection means. In this case, seek control means is provided for controlling the seek so that the amplitude is maximized by increasing the drive current value without switching the profile.

  According to a second aspect of the present invention, in the motor drive control device according to the first aspect, the actuator is an actuator of an optical pickup.

  According to a third aspect of the present invention, in the motor drive control device according to the first or second aspect, the seek control means switches to the latest profile when the step-out detecting means detects the step-out again. And control to seek.

  According to a fourth aspect of the present invention, in the motor drive control device according to the first or second aspect, the seek control means switches to the latest profile when the out-of-step detection is detected again by the out-of-step detection means. When the seek operation is completed, and the next seek operation is performed, control is performed so that the seek operation is switched to a profile that is one slower than the profile that was set when the step-out was detected.

  According to a fifth aspect of the present invention, there is provided a motor drive control method in a motor drive control device including a stepping motor for driving an actuator, wherein the stepping motor is driven by a drive control means based on a preset profile. The step of driving the actuator, the step of detecting the step-out of the driven stepping motor by the step-out detecting means, and the profile when the step-out is detected by the seek control means. And controlling to seek by maximizing the amplitude by increasing the drive current value without switching the above, and a motor drive control method.

  According to a sixth aspect of the invention, a computer of a motor drive control device including a stepping motor for driving an actuator drives and controls the actuator by driving the stepping motor based on a preset profile. Drive control means, step-out detection means for detecting step-out of a stepping motor driven by the drive control means, and drive current value without switching the profile when step-out detection is detected by the step-out detection means Is a program for functioning as seek control means for controlling so as to maximize the amplitude by increasing the frequency.

  According to the present invention, it is possible to provide a motor drive control device, a motor drive control method, and a program that perform appropriate control when a stepping motor step-out is detected.

1 is a block diagram showing a schematic configuration of a disc playback apparatus 1 according to the present embodiment. 5 is a flowchart showing an example of seek control processing performed in the disc playback apparatus 1 according to the present embodiment. It is the table figure shown about the correspondence of a counter value and the profile to be started. It is the figure shown about the switching of the profile according to a temperature change. It is the flowchart shown about an example of the seek control process performed within the disc reproducing | regenerating apparatus based on a prior art.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, the case where the motor drive control device according to the present invention is applied to a disk reproducing device will be exemplified.

FIG. 1 is a block diagram showing a schematic configuration of a disc playback apparatus 1 according to the present embodiment.
As shown in FIG. 1, the disc reproducing apparatus 1 includes an optical pickup drive control unit 10, an optical pickup unit 20, a control unit 30, a storage unit 40, a stepping motor MP, and a disk drive unit MD. Configured.
Under the control of the control unit 30, the disk reproducing apparatus 1 rotates the optical disk 50 with a disk drive unit MD such as a spindle motor, and the optical pickup unit 20 irradiates the recording surface of the optical disk 50 with a light beam such as laser light. Then, the reflected light is received to obtain a recording signal.

  The optical disc 50 is a storage medium having a recording surface such as a CD, a DVD, or a next-generation high-density information storage medium (such as an HDDVD or a Blu-ray disc) recorded with an optically readable recording signal. The recording signal is a signal modulated by EFM (Eight to Fourteen Modulation) or the like, and on the recording surface of the optical disc 50, concave and convex pits and holes are formed on tracks formed in a spiral shape along the circumferential direction of the optical disc 50. Recording is performed by utilizing the fact that the scattering, polarization, and reflectance of the reflected light with respect to the irradiation light differ depending on the presence / absence of opening, the difference in magnetization direction, the difference in crystal state, and the like.

  In any of the above-described storage media, there is no substitute for reading the recording signal by irradiating the track with a light beam and receiving the reflected light. Therefore, the operation processing described later can be similarly performed on any storage medium.

  The optical pickup unit 20 that acquires a recording signal from the optical disk 50 records on the basis of the reading optical system that irradiates the recording surface of the optical disk 50 with laser light or the like and receives the reflected light, and the amount of light received by the reading optical system. A signal generation unit that generates and outputs a signal, a track error signal indicating the amount of relative position deviation between the track formed on the optical disc 50 and the reading optical system, or a focus error signal indicating the focus state of the reading optical system, and the like. .

  The reading optical system in the optical pickup unit 20 includes a light source such as a laser diode that irradiates the optical disk 50 with a light beam, a quadrant light receiving element (QPD) that receives reflected light from the optical disk 50, and transmits light from the light source to the optical disk 50 side. A beam splitter that reflects the light reflected from the optical disk 50 to the QPD side, and a focusing lens that converges the light beam, an objective lens, an optical lens such as a cylindrical lens for detecting a focus state by an astigmatism method, It is configured with.

  Further, the optical pickup unit 20 includes an actuator A for driving and controlling the reading optical system, and the optical pickup unit 20 includes a drive signal output from the optical pickup drive control unit 10 and a control instruction from the control unit 30. A fine movement actuator capable of fine position adjustment of the reading optical system, a coarse movement actuator that performs a seek operation to select an arbitrary track of the optical disk 50 by driving the entire optical pickup unit 20 and performing wide position adjustment; Is provided.

  The optical pickup drive control unit 10 is a circuit having an IC (Integrated Circuit) (not shown), a buffer that temporarily stores various data, an amplifier that amplifies signals, and the like. The optical pickup drive control unit 10 drives the stepping motor MP under the control of the control unit 30 based on the track error signal and the focus error signal input when the recording signal is read by the optical pickup unit 20. Focusing (focus adjustment) and tracking (track following adjustment) are performed in the pickup unit 20.

  Further, the optical pickup drive control unit 10 drives a stepping motor MP, which will be described later, based on a preset profile, and causes the optical pickup unit 20 to seek. Further, the optical pickup drive control unit 10 has a function as a step-out detection unit that detects a step-out of the driven stepping motor MP.

  The stepping motor MP moves the optical pickup unit 20 via the moving mechanism, and seeks the optical pickup unit 20 in the radial direction of the optical disc 50.

The control unit 30 includes, for example, a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like, and controls each unit of the disc playback apparatus 1.
The CPU reads the processing program stored in the ROM, develops it in the RAM, and executes it, thereby controlling the entire disk reproducing apparatus 1.
The RAM expands a processing program executed by the CPU in a program storage area in the RAM, and stores input data and a processing result generated when the processing program is executed in the data storage area.
The ROM is composed of, for example, a semiconductor memory, and stores a processing program, data, and the like in advance. The ROM stores, for example, a seek control program for controlling the stepped motor that has stepped out so as not to step out again.

  Further, the control unit 30 does not switch the profile when the step-out is detected, maximizes the amplitude by increasing the drive current value, and switches to the latest profile when the step-out is detected again. When the seek is completed and the next seek is performed, control is performed so as to switch to a profile that is one slower than the profile that was set when the step-out was detected.

  The storage unit 40 is a nonvolatile memory such as a semiconductor memory, and stores various control programs executed by the control unit 30 and setting data. Specifically, the storage unit 40 stores program data relating to processing performed by the control unit 30 described later.

  As described above, the disc reproducing apparatus 1 according to the present embodiment drives the stepping motor MP based on a preset profile, thereby controlling the drive of the actuator (optical pickup drive control unit 10). Step-out detection means for detecting step-out of the stepping motor driven by the drive control means, and switching of the profile when step-out is detected, the amplitude is maximized by increasing the drive current value, and again When the out-of-step is detected, switch to the latest profile to complete the seek, and next seek, switch to the profile that is one slower than the profile that was set when the out-of-step was detected. Seek control means (control unit 30) for controlling to seek.

  Thereby, the disc reproducing apparatus 1 can perform seek control based on the fastest profile that can be activated at that time. Therefore, it is possible to prolong the life of an apparatus such as an optical pickup as a drive, and it is possible to prevent the occurrence of problems.

  FIG. 2 is a flowchart showing an example of seek control processing performed in the disc playback apparatus 1 according to the present embodiment. This seek control process is realized by the CPU executing a seek control program stored in the ROM when a seek control request is received from the user.

As shown in FIG. 2, in step S101, 1 is set to the counter i (i = 1).
In step S102, the profile corresponding to the counter value is activated with reference to the table. Here, FIG. 3 shows an example of a table showing the correspondence between the counter value and the profile to be activated.

  As shown in FIG. 3, for example, when the counter value i = 1, the profile A is activated. Here, as in the prior art, there are five types of profiles, A (fastest) to E (slowest), and the time required for seek control increases in order from A.

In step S103, it is determined whether or not the stepping motor has stepped out. When the stepping motor has stepped out, the process proceeds to step S105, and when the stepping motor has not stepped out, the process proceeds to the next step S104.
In step S104, seek control is completed. When the seek control is completed, the process proceeds to step S102.

In step S105, the amplitude is increased by increasing the drive current value.
In step S106, it is determined whether or not the stepping motor has stepped out. If the stepping motor has stepped out, the process proceeds to the next step S107. If the stepping motor has not stepped out, the process proceeds to step S108.
In step S107, profile E is activated. When the profile E is activated, the process proceeds to step S106.

In step S108, seek control is completed.
In step S109, 1 is added to the counter i (i = i + 1). When 1 is added to the counter i, the process proceeds to step S102.

As described above, when the step-out is detected, the control unit 30 in the disc reproducing apparatus 1 according to the present embodiment does not switch the profile at the first step-out and does not switch the profile at the second step-out. Switch to the latest profile. Further, after the seek is completed after switching to the latest profile, the control unit 30 switches to a profile that is one slower than the profile that was set when the step-out was detected when seeking again. Control as follows.
As a result, seek control in the disc playback apparatus 1 is not performed based on a profile that is slower than necessary each time, and seek control can be performed based on the fastest profile possible.

  As mentioned above, although concretely demonstrated based on embodiment which concerns on this invention, this invention is not limited to the said embodiment, It can change in the range which does not deviate from the summary.

  For example, in the above-described embodiment, five types of profiles A (fastest) to E (slowest) are described, but the number of profiles is not particularly limited.

  Further, for example, a condition such as a temperature change may be given, and the seek control as shown in FIG. 2 may be reset to return the control to the fastest profile (profile A). In this case, for example, as shown in FIG. 4, the relationship between the temperature and the seek time changes stepwise.

  In this way, by switching the profile according to the temperature change, it is possible to perform seek control based on the fastest possible profile.

  In the above embodiment, the optical pickup control of the disk reproducing apparatus is exemplified as an object to which the present invention is applied. However, the present invention is applicable to any drive system using a stepping motor. As a drive system using a stepping motor, for example, head control of a printer device and the like can be mentioned.

  In addition, the detailed configuration and detailed operation of each device constituting the disk reproducing device 1 can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Disc reproducing apparatus 10 Optical pick-up drive control part 20 Optical pick-up part A Actuator 30 Control part 40 Memory | storage part MP Stepping motor MD Disk drive part 50 Optical disk

Claims (6)

In a motor drive control device including a stepping motor for driving an actuator,
Drive control means for driving and controlling the actuator by driving the stepping motor based on a preset profile;
Step-out detection means for detecting step-out of the stepping motor driven by the drive control means;
Seek control means for performing control so as to maximize the amplitude by increasing the drive current value without switching the profile when the step out detection is detected by the step out detection means;
A motor drive control device comprising: The actuator is
The motor drive control device according to claim 1, wherein the motor drive control device is an actuator of an optical pickup. The seek control means includes
3. The motor drive control device according to claim 1, wherein when a step-out is detected again by the step-out detection unit, control is performed so as to switch to the latest profile and seek. The seek control means includes
When step-out detection is detected again by the step-out detection means, the profile is switched to the latest profile to complete the seek, and the next seek is performed in accordance with the profile set when the step-out is detected. The motor drive control device according to claim 1, wherein control is performed so that the seek is switched to a slower profile. A motor drive control method in a motor drive control device including a stepping motor for driving an actuator,
A step of driving and controlling the actuator by driving the stepping motor based on a preset profile by a drive control means;
A step of detecting step out of the driven stepping motor by step out detection means;
A step of controlling the seek control means so as to maximize the amplitude by increasing the drive current value without switching the profile when the step-out is detected; and
A motor drive control method including: A motor drive control device computer comprising a stepping motor for driving an actuator;
Drive control means for driving and controlling the actuator by driving the stepping motor based on a preset profile;
Step-out detection means for detecting step-out of the stepping motor driven by the drive control means;
Seek control means for performing control so that the amplitude is maximized by increasing the drive current value without switching the profile when the step-out detection means is detected;
Program to function as.

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