JP2007149166A - Motor drive controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor drive controller capable of appropriately shortening movement time in accordance with moving distance of a pickup unit. <P>SOLUTION: A control part 10 in a disk reader 100 acquires the moving distance of an optical pickup 40. Further, as the moving distance of the optical pickup 40 is long, the control part 10 makes the highest value of a pulse speed input to the stepping motor 50 larger, on the other hand, decreases acceleration and deceleration of the pulse, and generates a pulse on the basis of the highest value of the pulse speed and the acceleration and deceleration of the pulse to output the pulse to the stepping motor 50. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides motor drive control for controlling a stepping motor that moves a pickup unit that performs at least one of reading and writing of data with respect to a disk-shaped recording medium by driving at a rotational speed corresponding to an input pulse speed. Relates to the device.

  In various types of disc reproducing apparatuses such as a CD (Compact Disc) player and a DVD (Digital Versatile Disc) player, the optical pickup moves to the reading position on the data recording surface of the disc-shaped recording medium, and is recorded at the reading position. Can read the data. For the movement of the optical pickup, a stepping motor that is driven at a rotational speed corresponding to the speed of the input pulse, in other words, the number of pulses input per unit time is often used.

In order to read the data recorded on the disk-shaped recording medium at a high speed, it is necessary to shorten the moving time of the optical pickup by increasing the rotation speed of the stepping motor. However, due to the characteristics of the stepping motor, a step-out occurs, the optical pickup cannot reach the reading position, and it is necessary to control the movement of the optical pickup again, resulting in a long movement time. There is a case. For this reason, there has been proposed a technique that shortens the movement time of the optical pickup while preventing the step-out (for example, Patent Document 1).
JP 2002-329334 A

  Incidentally, the step-out in the stepping motor is caused by the relationship between the maximum rotational speed of the stepping motor and the rotational acceleration until the maximum value is reached. However, in the technique described in Patent Document 1 described above, the maximum value of the rotation speed of the stepping motor and the rotation acceleration are constant regardless of the moving distance of the optical pickup. However, it cannot be said that the movement time of the optical pickup is shortened.

  An object of the present invention is to solve the above-described problems, and to provide a motor drive control device capable of appropriately shortening the movement time according to the movement distance of the pickup unit.

  The motor drive control device of the present invention is a stepping that moves a pickup unit that performs at least one of reading and writing of data with respect to a disk-shaped recording medium by driving at a rotational speed corresponding to the speed of an input pulse. A motor that controls a motor, and a movement distance acquisition unit that acquires a movement distance that the pickup unit should move; and a maximum value of the speed of the input pulse based on the movement distance acquired by the movement distance acquisition unit A speed of the input pulse of the stepping motor based on the maximum value of the speed of the input pulse and the acceleration of the input pulse determined by the determining means; And input pulse control means for controlling.

  With this configuration, since the maximum value of the input pulse speed and the acceleration of the input pulse are determined based on the moving distance of the pickup unit, the moving time can be appropriately shortened according to the moving distance of the pickup unit. It becomes possible. Here, the speed of the input pulse indicates the number of pulses input to the stepping motor per unit time, and the acceleration of the input pulse indicates the degree of increase in the speed of the input pulse per unit time.

  Further, in the motor drive control device of the present invention, as the moving distance acquired by the moving distance acquiring means increases, the determining means increases the maximum value of the speed of the input pulse and increases the acceleration of the input pulse. You may make it reduce.

  With this configuration, when the movement distance of the pickup unit is long, the maximum value of the input pulse speed is increased, while by decreasing the acceleration of the input pulse, or when the movement distance of the pickup unit is short, While decreasing the maximum value of the input pulse speed and increasing the input pulse acceleration, it is possible to shorten the moving time of the pickup unit while preventing the step-out.

  In the motor drive control device of the present invention, the determination unit may further determine the deceleration of the input pulse based on the movement distance acquired by the movement distance acquisition unit.

  With this configuration, since the deceleration of the input pulse is also determined based on the moving distance of the pickup unit, the moving time can be appropriately shortened according to the moving distance of the pickup unit. Here, the deceleration of the input pulse indicates the degree of decrease in the speed of the input pulse per unit time.

  In the motor drive control device of the present invention, the determination unit may decrease the deceleration of the input pulse as the movement distance acquired by the movement distance acquisition unit is longer.

  By this configuration, when the moving distance of the pickup unit is long, by decreasing the deceleration of the input pulse, or when the moving distance of the pickup unit is short, by increasing the deceleration of the input pulse, The movement time of the pickup unit can be shortened while preventing the step-out.

  In the motor drive control device of the present invention, the movement distance acquisition means should perform at least one of the current position of the pickup unit on the data recording surface of the disc-shaped recording medium and the reading and writing of data. The movement distance of the pickup unit may be calculated based on the position.

  According to the present invention, the maximum value of the speed of the input pulse to the stepping motor and the acceleration and deceleration of the input pulse are determined based on the moving distance of the pickup unit. It is possible to appropriately shorten the travel time.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

  FIG. 1 is a diagram showing a configuration of a disk reader according to an embodiment of the present invention. A disk reader 100 shown in FIG. 1 reads data recorded on a disk-shaped recording medium 200, and includes a control unit 10 that controls the entire disk reader 100, and an operation unit 20 that receives an operation instruction from a user. The spindle motor 30 that rotates the disk-shaped recording medium 200, the optical pickup 40 that reads the data recorded on the recording surface of the disk-shaped recording medium 200, and the light that is driven at a rotational speed proportional to the speed of the input pulse. And a stepping motor 50 for moving the pickup 40. Among these, the control unit 10 has a movement distance calculation function 12, a speed / acceleration / deceleration determination function 14, and a stepping motor control function 16.

  The control unit 10 controls the entire disk reading device 100. When an instruction to read the disc-shaped recording medium 200 is given by the operation of the operation unit 20 by the user, the control unit 10 rotates the spindle motor 20 according to the instruction. Further, the control unit 10 drives the stepping motor 50 by the movement distance calculation function 12, the speed / acceleration / deceleration determination function 14 and the stepping motor control function 16, and the optical pickup 40 stores the data on the recording surface of the disk-shaped recording medium 200. Move to the position to be read. After moving, the optical pickup 40 reads the data recorded on the disk-shaped recording medium 200 and outputs the data to the control unit 10.

  The disk reader 100 has the above-described configuration, and next, drive control of the stepping motor 50 by the control unit 10 will be described. FIG. 2 is a flowchart showing drive control of the stepping motor 50 by the control unit 10.

  The control unit 10 determines whether reading of the disc-shaped recording medium 200 is instructed by the operation of the operation unit 20 by the user (S101). When reading of the disc-shaped recording medium 200 is instructed, the control unit 10 calculates the distance (hereinafter referred to as “movement distance”) to which the optical pickup 40 should move by the movement distance calculation function 12 (S102).

  Specifically, the control unit 10 first acquires the current position of the optical pickup 40 on the data recording surface of the disc-shaped recording medium 200. For example, information on the position of the optical pickup 40 in the initial state on the data recording surface of the disk-shaped recording medium 200 is recorded as an initial value in a memory (not shown) in the control unit 10. This initial value is updated to information on the position after the movement every time the optical pickup 40 is moved by driving the stepping motor 50, and the current position of the optical pickup 40 on the recording surface of the disc-shaped recording medium 200 is updated. As shown.

  Next, the control unit 10 acquires the recording position of data instructed to be read on the data recording surface of the disc-shaped recording medium 200 based on the operation of the operation unit 20 by the user. Then, the control unit 10 calculates the difference between the current position of the optical pickup 40 on the data recording surface of the disc-shaped recording medium 200 and the recording position of the data instructed to be read as the movement distance.

  After calculating the moving distance of the optical pickup 40, the control unit 10 next determines the maximum value of the pulse speed input to the stepping motor 50 and the acceleration / deceleration of the pulse by the speed / acceleration / deceleration determination function 14. (S103, S104).

  Specifically, the control unit 10 does not cause the stepping motor 50 to step out, and the optical pickup 40 moves from the current position on the data recording surface of the disk-shaped recording medium 200 to the recording position of the data instructed to be read. The maximum value of the pulse speed and the acceleration / deceleration are determined so that the robot can move in the shortest time.

  FIG. 3 is a diagram illustrating the time lapse of the speed of the pulse input to the stepping motor 50 when the optical pickup 40 is moved. As shown in FIG. 3, the pulse speed initially becomes a predetermined activation PPS value, and the optical pickup 40 starts moving. The pulse speed gradually increases and maintains its value when it reaches the maximum PPS. Thereafter, the speed of the pulse gradually decreases and becomes the value of the starting PPS again. At this time, the optical pickup 40 reaches the data recording position instructed to read the data on the recording surface of the disk-shaped recording medium 200.

  The shaded area shown in FIG. 3 corresponds to the moving distance of the optical pickup 40. The hatched portion shown in FIG. 3 indicates that the optical pickup 40 can move from the current position on the data recording surface of the disc-shaped recording medium 200 to the recording position of the data instructed to be read in the shortest time. In this area, the length in the horizontal axis direction (time direction) is made as small as possible, and the area of the area is made to correspond to the moving distance of the optical pickup.

  However, the step out in the stepping motor 50 is the relationship between the maximum value of the rotational speed and the rotational acceleration and rotational deceleration, in other words, the maximum value of the pulse speed and the pulse speed from the initial value to the maximum value. It is caused by the relationship between the acceleration to reach and the deceleration from the maximum value to the initial value again, and in order not to cause step-out, the maximum value of the pulse speed is large. It is necessary to reduce the acceleration and deceleration, or to reduce the maximum speed when the pulse acceleration and deceleration are large. Therefore, the controller 10 does not simply increase both the pulse speed and acceleration / deceleration, but the stepping motor 50 does not step out, and the area of the shaded area shown in FIG. Therefore, it is necessary to determine the maximum value of the pulse speed and the acceleration / deceleration so as to have a magnitude corresponding to the moving distance.

  FIG. 4 shows a case where the movement distance of the optical pickup 40 is a radial distance on the data recording surface of the disk-shaped recording medium 200 (at the time of full seek), and a movement distance of the optical pickup 40 is that of the data of the disk-shaped recording medium 200. It is a figure which shows the time passage of the speed of the optimal pulse input into the stepping motor 50 when it is the distance of 1/3 of the radial direction in a recording surface (at the time of 1/3 seek). FIG. 5 is a diagram showing the correspondence between the acceleration time of the pulse at the time of full seek and the movement time of the optical pickup 40. FIG. 6 shows the optimum acceleration time of the pulse at the time of 1/3 seek and the optical pickup 40. It is a figure which shows a corresponding relationship with the movement time.

  In the case of full seek, as indicated by a solid line 301 in FIG. 4, the control unit 10 increases the maximum value of the pulse speed (maximum PPS1) while decreasing the acceleration / deceleration. In this case, if the pulse acceleration time (the time from starting PPS to reaching the maximum PPS1) is 35 ms, the moving time of the optical pickup 40 can be minimized as shown in FIG. Further, if the pulse deceleration time (time from the highest PPS1 to the start PPS) is also 35 ms, the movement time of the optical pickup 40 is the shortest.

  On the other hand, in the case of 1/3 seek, as indicated by the solid line 302 in FIG. 4, the control unit 10 reduces the maximum value of the pulse speed (maximum PPS2) to be lower than the maximum PPS1, while the acceleration / deceleration is a full seek. Larger than. In this case, if the pulse acceleration time (time from starting PPS to reaching the maximum PPS1) is 20 ms, the moving time of the optical pickup 40 can be minimized as shown in FIG. Furthermore, if the pulse deceleration time (time from the highest PPS2 to the start PPS) is also 20 ms, the movement time of the optical pickup 40 is the shortest.

  After determining the maximum value of the speed of the pulse input to the stepping motor 50 and the acceleration / deceleration speed of the pulse, the control unit 10 uses the stepping motor control function 16 to determine the maximum value of the determined pulse speed. A pulse is generated based on the acceleration / deceleration and is output to the stepping motor 50 (S105). The stepping motor 50 is driven at a rotational speed proportional to the speed of the input pulse, and moves the optical pickup 40 from the current position on the data recording surface of the disk-shaped recording medium 200 to the data recording position instructed to be read. .

  As described above, in the disk reading device 100, the control unit 10 acquires the moving distance of the optical pickup 40, and increases the maximum value of the speed of the pulse input to the stepping motor 50 as the moving distance increases. The acceleration / deceleration of the pulse is reduced, and a pulse is generated based on the maximum value of the pulse and the acceleration / deceleration of the pulse, and is output to the stepping motor 50. Therefore, the maximum value and acceleration / deceleration of the pulse speed can be controlled so that the stepping motor 50 does not step out, and the moving time of the optical pickup 40 can be minimized.

  In the above-described embodiment, the pulse acceleration and the deceleration are the same, but the deceleration may be set to a value larger than the acceleration. In this case, there is a possibility that step-out occurs when the rotation of the stepping motor 50 is decelerated. At this time, the optical pickup 40 is close to the recording position of the data instructed to read the data on the recording surface of the disk-shaped recording medium 200. Since it exists in the position, even if it is necessary to control the movement of the optical pickup 40 again, the drive control can be completed in a short time.

  As described above, the motor drive control device according to the present invention can appropriately shorten the movement time according to the movement distance of the pickup unit, and is useful as a motor drive control device.

It is a figure which shows the structure of the disc reader concerning embodiment of this invention. It is a flowchart which shows drive control of the stepping motor by a control part. It is a figure which shows the time passage of the speed of the pulse input into a stepping motor at the time of movement of an optical pick-up. It is a figure which shows the time passage of the speed of the optimal pulse input into a stepping motor at the time of a full seek and 1/3 seek. It is a figure which shows the correspondence of the acceleration time of the pulse at the time of a full seek, and the movement time of an optical pick-up. It is a figure which shows the correspondence of the acceleration time of the pulse at the time of 1/3 seek, and the movement time of an optical pick-up.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control part 12 Movement distance calculation function 14 Speed / acceleration / deceleration determination function 16 Stepping motor control function 20 Operation part 30 Spindle motor 40 Optical pick-up 50 Stepping motor 100 Motor drive control apparatus 200 Disc-shaped recording medium

Claims (5)

A motor drive control device that controls a stepping motor that moves a pickup unit that performs at least one of reading and writing of data with respect to a disk-shaped recording medium by driving at a rotational speed according to the speed of an input pulse. There,
A moving distance acquisition means for acquiring a moving distance that the pickup unit should move;
A determination means for determining a maximum value of the speed of the input pulse and an acceleration of the input pulse based on the movement distance acquired by the movement distance acquisition means;
Input pulse control means for controlling the speed of the input pulse of the stepping motor based on the maximum value of the speed of the input pulse determined by the determining means and the acceleration of the input pulse. Motor drive control device. The determination unit increases the maximum value of the speed of the input pulse and decreases the acceleration of the input pulse as the movement distance acquired by the movement distance acquisition unit is longer. The motor drive control device described. 3. The motor drive control device according to claim 1, wherein the determination unit further determines a deceleration of the input pulse based on the movement distance acquired by the movement distance acquisition unit. The motor drive control device according to claim 3, wherein the determination unit decreases the deceleration of the input pulse as the movement distance acquired by the movement distance acquisition unit is longer. The movement distance acquisition means moves the pickup unit based on a current position of the pickup unit on a data recording surface of the disc-shaped recording medium and a position where at least one of data reading and writing is to be performed. The motor drive control device according to claim 1, wherein the distance is calculated.

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