JP2003100040A - Optical disk driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk driving device whose power consumption is suppressed by changing over the power source voltage of a motor driver from a high voltage to a low voltage. SOLUTION: This optical disk driving device is constituted of a selection circuit 1 selecting either of two kinds of power source voltages 12 V, 5 V and a motor driver 2 driving a load 3 consisting of a spindle motor and an optical pickup. In this device, a command signal 3 is connected to the selection circuit 1 and a command signal 1 and a command signal 2 are connected to the motor driver 2. Moreover, the output line 15 of the circuit 1 is connected to the motor driver 2. Here, although explanation is performed as to the case where power source voltages are of two kinds, it is not objectionable to provide many kinds of power source voltages in the disk driving device without being limited by this example. Furthermore, the selection circuit 1 constitutes mainly a power source voltage selecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk drive device, and more particularly, to an optical disk drive device provided with a motor driver that suppresses power consumption.

[0002]

2. Description of the Related Art Conventional optical disk devices are provided with power saving functions such as a low rotation mode and a standby mode from the viewpoint of enhancing the power saving effect. This is a function of suppressing the power consumption by reducing the rotational speed of the disk motor or stopping the disk motor according to the judgment of the CPU when an access command such as a read command or a seek command is not issued from the host computer for a predetermined time. . In addition, JP-A-11
JP-A-96649 discloses a disk drive device that applies a reverse voltage to a disk motor for rotating a disk to forcibly stop the disk motor, and in a power saving mode, suppresses the application of the reverse voltage to coast the disk motor. It is disclosed to let it stop. Also, if the disk is not accessed for a certain period of time, even if the disk drive shifts from normal mode to sleep mode to stop the disk motor, the disk motor should be allowed to coast in sleep mode. Discloses a method of further enhancing the power saving effect without consuming a large current each time the sleep mode is entered. Further, Japanese Patent Application Laid-Open No. 11-306572 discloses a technique capable of realizing high-speed and stable skew servo operation and reducing power consumption. according to this,
Skew control for ensuring that the laser optical axis is tilted properly with respect to the disc-shaped recording medium is performed once every n rotations of the disc-shaped recording medium, and the rotation angle position of the disc-shaped recording medium is a specific position. It should be executed at the timing. That is, the surface wobbling of the disk influences the skew error signal as a signal of one rotation cycle, but the interval is once every n rotations and the rotation angle position of the disk-shaped recording medium becomes the specific position. When the skew servo operation is executed in, the skew servo operation is not affected by the surface wobbling (does not follow the surface wobbling). Further, not following the surface wobbling also leads to elimination of unnecessary operation of the skew mechanism.

Further, in Japanese Patent Laid-Open No. 2001-155417, a deceleration method with low power consumption can be selected when rapid deceleration is not required, and the disk is stopped while the disk is being decelerated with the method with low power consumption. A disk device and a disk deceleration stop method for a disk device that can stop the disk quickly and surely even when a need arises are disclosed. According to this, in a disk device having a function of decelerating or stopping a rotating disk, a reverse voltage is applied to a disk motor that rotates the disk, depending on the type of command when decelerating or stopping. Then, the forced deceleration stop operation of forcibly decelerating or stopping is performed, or the deceleration or stop is performed by the power saving deceleration stop operation which consumes less power than the forced operation.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention CD-ROM, CD-
Disk drive devices such as R / RW and DVD drives generally include a spindle motor that rotates a disk,
It has a seek motor for moving the carriage and a driver circuit for supplying an electric current to each motor. As the disk drive device has become faster, more current has been required to flow through the motor, resulting in an increase in current consumption. However, users have demanded lower drive power consumption. When the power saving function of the low rotation mode and the standby mode is provided, the portable computer frequently shifts to the low rotation mode or the sleep mode, but a large current is consumed by decelerating the disk motor each time. There is. In addition, JP-A-11-96
According to Japanese Patent Laid-Open No. 649, the application of the reverse voltage is suppressed in the power saving mode to stop the disk motor by inertial rotation. However, in the normal mode, the reverse voltage is applied and thus a large current is consumed. Further, Japanese Patent Application Laid-Open No. 11-306572 is intended to eliminate unnecessary operation of the skew mechanism and thereby reduce power consumption, which is different from the gist of the present invention.
Further, in Japanese Patent Laid-Open No. 2001-155417, deceleration or stop is performed by the power saving deceleration stop operation, but a large current is consumed in the forced deceleration stop operation. In view of the above problems, it is an object of the present invention to provide an optical disk drive device that suppresses power consumption by switching the power supply voltage of a motor driver from high voltage to low voltage.

[0005]

In order to solve the above problems, the present invention provides a rotation control of an information recording medium and a seek operation for moving an optical pickup in the radial direction of the information recording medium. In addition, in an optical disk drive device having a motor driver for performing a tracking operation for searching a track position and recording or reproducing information by a laser beam, any one of a plurality of different power supply voltages supplied to the motor driver is selected. It further comprises a power supply voltage selecting means for controlling the rotation control, the seek operation and the tracking operation by the power supply voltage selected by the power supply voltage selecting means. The number of rotations of the recording medium changes depending on the writing method of the optical disk, for example, ZCLV (Zone Constant Linear).
Velocity: constant linear velocity between zones)
The number of revolutions increases at a certain zone. Further, in the seek operation, the speed of the motor is gradually reduced when the optical pickup approaches a predetermined position. At a constant power supply voltage, the current is increased to increase the speed of the motor, and the current is decreased to decrease the rotation speed of the motor. Since power consumption is determined by the product of current and voltage, the lower the voltage, the lower the power consumption if the current value is the same. According to this invention, since the rotation control, the seek operation, and the tracking operation are controlled by the power supply voltage selected by the power supply voltage selection means, wasteful power consumption is suppressed,
An appropriate power supply voltage can be supplied according to the rotation speed. Further, the invention of claim 2 is an effective means of the present invention, wherein the power supply voltage selecting means selects the power supply voltage by a selection signal from the outside. The operations of the spindle motor and the optical pickup are controlled by an external CPU. Therefore, the control can be performed arbitrarily from the outside. According to such a technical means, since the power supply voltage is selected by the selection signal from the outside, fine control can be freely performed.

Further, the invention of claim 3 further comprises current detecting means for detecting a current flowing through the motor driver,
It is also an effective means of the present invention to select any one of the power supply voltages by the power supply voltage selection means when the current detection means detects a predetermined current value. When the voltage is constant, the current flowing through the load is proportional to its rotation speed. Therefore, when the change in the current flowing from the power supply to the motor driver is detected, the timing for switching to the proper power supply voltage is known. According to such a technical means, when the current detection means detects a predetermined current value, the power supply voltage selection means selects any one of the power supply voltages, so that an accurate current value from the power supply can be detected. It is possible to automatically supply an appropriate power supply voltage according to the rotation speed. Further, the invention of claim 4 further comprises voltage detection means for detecting a voltage of a current control signal for controlling a current flowing through the motor driver by a voltage value,
It is also an effective means of the present invention to select any one of the power supply voltages by the power supply voltage selection means when the voltage detection means detects a predetermined voltage value. The signal that controls the current flowing through the motor driver changes according to the voltage of the signal. For example, when the current value is increased / decreased in proportion to the voltage and if the signal value is monitored, it can be determined whether the current value exceeds a certain specified value or becomes less than the specified value. According to such a technical means, when the voltage detecting means detects a predetermined voltage value, the power supply voltage selecting means selects any one of the power supply voltages. Therefore, the current can be detected by a relatively simple circuit configuration. The cost of the circuit can be reduced.

According to a fifth aspect of the present invention, there is further provided an inter-terminal voltage detecting means for detecting a voltage between the output terminals of the motor driver, and when the inter-terminal voltage detecting means detects a predetermined voltage value, Selecting any one of the power supply voltages by the power supply voltage selecting means is also an effective means of the present invention. A way to detect the exact current in the load is to directly detect the current flowing into the load. If that is difficult
If the impedance of the load is known in advance as a substitute characteristic, the current value can be indirectly detected from the terminal voltage. According to this technical means, when the inter-terminal voltage detection means detects a predetermined voltage value, the power supply voltage selection means selects any one of the power supply voltages, so that a more accurate current value can be detected. It is possible to automatically supply an appropriate power supply voltage according to the rotation speed. According to a sixth aspect of the invention, there is further provided a rotation speed detecting means for detecting a rotation speed of a rotating means for controlling the rotation of the recording medium by the motor driver, and the rotation speed detecting means detects a predetermined rotation speed. It is also an effective means of the present invention to select any one of the power supply voltages by the power supply voltage selection means. The motor rotation speed and the current value are in a proportional relationship. If the load is constant, it is proportional to the applied voltage. Therefore, a means for detecting the rotation speed of the motor is provided on the motor side and the motor driver side, and the power supply voltage can be switched by detecting the rotation speed. According to such a technical means, when the rotation speed detecting means detects a predetermined rotation speed, the power supply voltage selecting means selects any one of the power supply voltages, so that the operation of the motor itself can be confirmed and further reliable. It is possible to automatically supply a proper power supply voltage according to the number of revolutions.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the constituent elements, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely explanatory examples, not the gist of limiting the scope of the present invention thereto, unless specifically stated. .. FIG. 1A is a block diagram of a motor driver and its relation according to a first embodiment of the present invention. Figure 1 (b) shows
It is a timing chart for explaining it. First, this configuration is composed of a selection circuit 1 for selecting one of two types of power supply voltages 12V and 5V, and a motor driver 2 for driving a load 3 composed of a spindle motor and an optical pickup. The command signal 3 is connected, and the command signal 1 and the command signal 2 are connected to the motor driver 2. The output line 15 of the selection circuit 1 is connected to the motor driver 2. Here, a case where the power supply voltage is two kinds will be described, but the power supply voltage is not limited to this and may be many. The selection circuit 1 mainly constitutes the power supply voltage selection means.

Next, this operation will be described. It is assumed that the selection circuit 1 selects the 12V power supply when the command signal 3 is at the high level, and selects the 5V power supply when at the low level. First, the command signal 3 becomes high level, and the selection circuit 1
Selects a 12V power supply. Then, 12V power is supplied to the motor driver 2 from the output line 15 of the selection circuit 1. In that state, the command signal 1 and the command signal 2 simultaneously rise, and when the command signal 1 becomes high level, the output of the motor driver 2 becomes valid. The command signal 2 is a signal for instructing a current value to be applied to the load 3. A large amount of current flows up to the point A to rotate the motor at high speed, and the current gradually decreases from the point A to the point B. The signal 3 is set to the low level, and the selection circuit 1 selects the power supply of 5V. in this way,
The rotation speed of the recording medium changes depending on the writing method of the optical disc. For example, ZCLV (Zone Constant Linear Vel)
ocity: constant linear velocity between zones), etc., the number of revolutions increases when a certain zone is used as a boundary. Further, in the seek operation, the speed of the motor is gradually reduced when the optical pickup approaches a predetermined position. At a constant power supply voltage, the current is increased to increase the speed of the motor, and the current is decreased to decrease the rotation speed of the motor. Since power consumption is determined by the product of current and voltage, the lower the voltage, the lower the power consumption if the current value is the same. As a result, the power supply voltage selected by the selection circuit 1 controls the rotation control, the seek operation, and the tracking operation of the spindle motor of the load 3, so that wasteful power consumption is suppressed and an appropriate power supply voltage according to the rotation speed is obtained. Can be supplied. Further, since the power supply voltage is selected by the command signal 3 from the outside, fine control can be freely performed.

FIG. 2A is a block diagram of a motor driver according to the second embodiment of the present invention and its relation. Figure 2
(B) is a timing chart for explaining it. Since the same components are designated by the same reference numerals, duplicate description will be omitted. 2 is different from FIG. 1 in that a current detector 5 is added instead of the command signal 3. This is connected between the selection circuit 4 and the motor driver 2 so that the current detector 5 enters from the power supply line 21 and exits from the power supply line 16. Further, the switching signal 20 generated when a predetermined current is detected by the current detector 5 is input to the selection circuit 4. The selection circuit 4 mainly forms the power supply voltage selection means, and the current detector 5 mainly forms the current detection means.

Next, this operation will be described. It is assumed that the selection circuit 1 selects the 12V power supply when the switching signal 20 is at the high level, and selects the 5V power supply when at the low level. First, the switching signal 20 becomes high level, and the selection circuit 4 selects the 12V power source. Then the selection circuit 4
Power of 12V is supplied to the motor driver 2 from the output line 21 through the current detector 5. In this state, the command signal 1 and the command signal 2 simultaneously rise, and when the command signal 5 goes high, the output of the motor driver 2 becomes valid.
The command signal 4 is a signal for instructing a current value to be passed through the load 3. When a large amount of current is supplied up to the point A to rotate the motor at high speed and the current is gradually reduced from the point A, the command signal 4 crosses the threshold value Ith. Come to point C. Then, when the current detector 5 detects it and sets the switching signal 20 to the low level, the selection circuit 4 selects the power supply of 5V. Thus, when the voltage is constant, the current flowing through the load is proportional to its rotation speed. Therefore, when the change in the current flowing from the power supply to the motor driver 2 is detected, the timing for switching to the proper power supply voltage is known. With this, when the current detector 5 detects a predetermined current value, the selection circuit 4 selects any one of the power supply voltages, so that an accurate current value from the power supply can be detected, and an appropriate current value according to the rotation speed can be detected. The power supply voltage can be automatically supplied.

FIG. 3A is a block diagram of a motor driver according to a third embodiment of the present invention and its relation. Figure 3
(B) is a timing chart for explaining it. Since the same components are designated by the same reference numerals, duplicate description will be omitted. 3 is different from FIG. 2 in that a voltage detector 7 is added instead of the current detector 5. This detects the voltage of the command signal 6 and is input to the selection circuit 6 as the switching signal 10. The selection circuit 6 mainly constitutes a power supply voltage selection means, and the voltage detector 7
Mainly constitutes the voltage detecting means. Next, this operation will be described. When the switching signal 10 is at the high level, the selection circuit 1 selects the 12V power source, and when it is at the low level, the selection circuit 1 selects 5V.
The V power source shall be selected. First, the switching signal 10
Becomes high level, and the selection circuit 6 selects the 12V power source. Then, 12V power is supplied to the motor driver 2 from the output line 17 of the selection circuit 6. In this state, the command signal 6 and the command signal 7 simultaneously rise, and when the command signal 7 goes high, the output of the motor driver 2 becomes valid. The command signal 6 is a signal for instructing a current value to be passed through the load 3. When a large amount of current is supplied up to the point A to rotate the motor at high speed, the current is gradually decreased from the point A to the point B. , C point which intersects the threshold value Vth. Then, the voltage detector 7 detects it and sets the switching signal 10 to the low level, and the selection circuit 6 selects the power supply of 5V. In this way, the signal that controls the current flowing through the motor driver 2 changes according to the voltage of the signal. For example, when the current value is increased / decreased in proportion to the voltage, if the voltage value is monitored, it can be determined whether it exceeds a certain specified value or becomes less than the specified value. Accordingly, when the voltage detector 7 detects a predetermined voltage value, the selection circuit 6 selects any one of the power supply voltages.
The current can be detected with a relatively simple circuit configuration, and the cost of the circuit can be reduced.

FIG. 4A is a block diagram of a motor driver according to a fourth embodiment of the present invention and its relation. Figure 4
(B) is a timing chart for explaining it. Since the same components are designated by the same reference numerals, duplicate description will be omitted. 4 is different from FIG. 3 in that an inter-terminal voltage detector 9 is added instead of the voltage detector 7. This detects the voltage between the terminals of the motor driver 2 and is input to the selection circuit 8 as the switching signal 11. The selection circuit 8 mainly constitutes the power supply voltage selection means, and the inter-terminal voltage detector 9 mainly constitutes the inter-terminal voltage detection means. Next, this operation will be described. It is assumed that the selection circuit 8 selects the 12V power supply when the switching signal 11 is at the high level, and selects the 5V power supply when at the low level. First, the switching signal 11 becomes high level, and the selection circuit 8 selects the 12V power source. Then, 12V power is supplied from the output line 18 of the selection circuit 8 to the motor driver 2. In that state, the command signal 8 and the command signal 9
Are simultaneously raised and the command signal 9 becomes high level, the output of the motor driver 2 becomes effective. The command signal 8 is a signal for instructing the current value to be passed through the load 3. When a large amount of current is supplied up to the point A to rotate the motor at high speed, the current is gradually reduced from the point A to the point B. , Threshold V
Come to point C where th intersects. Then the inter-terminal voltage detector 9
Detects this and sets the switching signal 11 to the low level, and the selection circuit 8 selects the power supply of 5V. Thus, load 3
The method of detecting the accurate current of is to directly detect the current flowing into the load 3. If that is difficult, if the impedance of the load 3 is known in advance as a substitute characteristic, the current value can be indirectly detected from the terminal voltage. As a result, when the inter-terminal voltage detector 9 detects a predetermined voltage value, the selection circuit 8 selects any one of the power supply voltages, so that a more accurate current value can be detected and an appropriate value depending on the number of revolutions. The power supply voltage can be automatically supplied.

FIG. 5A is a block diagram of a motor driver according to a fifth embodiment of the present invention and its relation. Figure 5
(B) is a figure showing the relationship between the rotation speed of a motor, and a voltage. Since the same components are designated by the same reference numerals, duplicate description will be omitted. 5 is different from FIG. 4 in that the rotation speed detector 13 is used instead of the terminal voltage detector 9.
Is the point that was added. This indirectly detects the rotation speed of the spindle motor from the motor driver 2 through a signal line 22 by a hall element or the like, and inputs it to the selection circuit 12 as a switching signal 14. The selection circuit 12 mainly constitutes the power supply voltage selection means, and the rotation speed detector 13 mainly constitutes the rotation speed detection means. Next, this operation will be described. When the switching signal 14 is at the high level, the selection circuit 12 selects the 12V power source, and when the switching signal 14 is at the low level, the selection circuit 5
The V power source shall be selected. First, the switching signal 14
Becomes a low level, and the selection circuit 12 selects the power supply of 5V. Then, the power of 5V is supplied to the motor driver 2 from the output line 19 of the selection circuit 12. In that state, the command signal 10 and the command signal 11 simultaneously rise, and the command signal 1
When 1 goes high, the output of the motor driver 2 becomes valid. The command signal 10 is a signal for instructing the value of the current flowing through the load 3, and the motor gradually increases in rotation speed from point A,
At the point B, the rotation speed detector 13 sets the switching signal 14 to the high level and the selection circuit 12 selects the 12V power source. In this way, the rotation speed of the motor and the current value are in a proportional relationship. If the load is constant, it is proportional to the applied voltage. Therefore, it is possible to switch the power supply voltage by providing a means for detecting the number of rotations of the motor on the motor and the motor driver side and detecting the number of rotations. As a result, when the rotation speed detector 13 detects a predetermined rotation speed, the selection circuit 12 selects any one of the power supply voltages, so that the operation of the motor itself can be confirmed and the rotation speed can be more reliably determined. A proper power supply voltage can be automatically supplied.

[0015]

As described above, according to the present invention, in claim 1, the rotation control, the seek operation, and the tracking operation are controlled by the power supply voltage selected by the power supply voltage selecting means. Power consumption can be suppressed and an appropriate power supply voltage can be supplied according to the rotation speed. According to the second aspect, since the power supply voltage is selected by the selection signal from the outside, fine control can be freely performed. According to a third aspect of the present invention, when the current detection means detects a predetermined current value, the power supply voltage selection means selects any one of the power supply voltages. Therefore, an accurate current value from the power supply can be detected, and the number of revolutions can be increased. It is possible to automatically supply the appropriate power supply voltage according to. According to a fourth aspect of the present invention, when the voltage detecting means detects a predetermined voltage value, the power supply voltage selecting means selects any one of the power supply voltages. Therefore, the current can be detected by a relatively simple circuit configuration, The cost can be reduced. According to a fifth aspect of the present invention, when the inter-terminal voltage detection means detects a predetermined voltage value, the power supply voltage selection means selects any one of the power supply voltages, so that a more accurate current value can be detected and the number of revolutions can be increased. It is possible to automatically supply the appropriate power supply voltage according to. According to a sixth aspect of the present invention, when the rotation speed detecting means detects a predetermined rotation speed, the power supply voltage selecting means selects any one of the power supply voltages. It can automatically supply the appropriate power supply voltage according to the number.

[Brief description of drawings]

FIG. 1A is a block diagram of a motor driver according to a first embodiment of the present invention and its associated block diagram, and FIG. 1B is a timing chart for explaining it.

FIG. 2A is a block diagram of a motor driver according to the second embodiment of the present invention and its related block diagram, and FIG. 2B is a timing chart for explaining it.

FIG. 3A is a block diagram of a motor driver according to a third embodiment of the present invention and its related block diagram, and FIG. 3B is a timing chart for explaining it.

FIG. 4A is a block diagram of a motor driver according to a fourth embodiment of the present invention and its related block diagram, and FIG. 4B is a timing chart for explaining it.

FIG. 5A is a block diagram of a motor driver according to a fifth embodiment of the present invention and its associated block diagram, and FIG. 5B is a diagram showing a relationship between a motor rotation speed and a voltage.

[Explanation of symbols]

1 selection circuit, 2 motor driver, 3 load

Claims (6)

[Claims] 1. A motor driver for controlling the rotation of an information recording medium, performing a seek operation of moving an optical pickup in a radial direction of the information recording medium, and a tracking operation of searching a track position, and reading information by a laser beam. The optical disk drive device for recording or reproducing further comprises a power supply voltage selection means for selecting one of a plurality of different power supply voltages to be supplied to the motor driver, and the power supply voltage selected by the power supply voltage selection means. An optical disk drive device characterized by controlling the rotation control, the seek operation, and the tracking operation. 2. The optical disk drive device according to claim 1, wherein the power supply voltage selecting means selects the power supply voltage according to a selection signal from the outside. 3. A current detection means for detecting a current flowing through the motor driver is further provided, and when the current detection means detects a predetermined current value, the power supply voltage selection means selects one of the power supply voltages. The optical disk drive device according to claim 1, wherein the optical disk drive device is selected. 4. The power supply voltage selection means further comprising voltage detection means for detecting a voltage of a current control signal for controlling a current flowing through the motor driver with a voltage value, and the voltage detection means detects a predetermined voltage value. 2. The optical disk drive device according to claim 1, wherein any one of the power supply voltages is selected by means. 5. An inter-terminal voltage detecting means for detecting a voltage between the output terminals of the motor driver is further provided, and when the inter-terminal voltage detecting means detects a predetermined voltage value, the power supply voltage selecting means causes the power supply to operate. 2. The optical disk drive device according to claim 1, wherein any one of the voltages is selected. 6. The motor driver further comprises rotation speed detection means for detecting the rotation speed of rotation means for controlling the rotation of the recording medium, and when the rotation speed detection means detects a predetermined rotation speed, the power supply voltage is increased. 2. The optical disk drive device according to claim 1, wherein any one of the power supply voltages is selected by the selection means.