IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0367766
(2006-03-03)
|
등록번호 |
US-7432680
(2008-10-07)
|
우선권정보 |
JP-2005-060580(2005-03-04) |
발명자
/ 주소 |
- Kamiya,Tomonori
- Kura,Takeshi
- Shigeoka,Yukihiko
- Nishiwaki,Naohiro
|
출원인 / 주소 |
|
대리인 / 주소 |
Occhiuti Rohlicek & Tsao LLP
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined am
A motor control circuit for reducing current consumption. A stepping motor control circuit includes an A/B phase current setting signal generation circuit for generating an A/B phase current signal setting signals provided to a stepping motor driver to supply a stepping motor with a predetermined amount of drive current. Based on a switch signal, first and second switches selectively output an A/B phase current setting signal and an A/B phase reference signal, for reducing the drive current of the stepping motor more than the A/B phase current setting signal. An intermittent drive control circuit generates the switch signal. The stepping motor control circuit provides the motor driver with the A/B phase reference signal in accordance with the switch signal.
대표청구항
▼
What is claimed is: 1. A circuit for controlling a motor, the circuit comprising: a motor control unit for controlling the motor for moving an optical pickup unit along a radial direction of an optical disc, wherein the optical pickup unit records data to the optical disc and/or reproduces the data
What is claimed is: 1. A circuit for controlling a motor, the circuit comprising: a motor control unit for controlling the motor for moving an optical pickup unit along a radial direction of an optical disc, wherein the optical pickup unit records data to the optical disc and/or reproduces the data recorded on the optical disc, wherein the motor control unit selectively supplies the motor with a first drive current, for driving the motor, and a second drive current, having a current amount reduced from the first drive current. 2. The circuit according to claim 1, wherein the motor is driven by a motor driver, and the motor control unit includes: a current setting signal generation circuit for generating a current setting signal corresponding to the first drive current; a switch circuit, connected to the current setting signal generation circuit, for providing, in accordance with a switching signal, the motor driver with either one of the current setting signal and a current reducing signal corresponding to the second drive current; and an intermittent drive control circuit, connected to the switch circuit, for generating the switching signal. 3. The circuit according to claim 2, wherein the current setting signal generation circuit generates the current setting signal in correspondence with a microstep drive technique based on a step number, corresponding to a rotation angle of the motor, and an excitation current setting value, indicating excitation current flowing through the motor. 4. The circuit according to claim 2, wherein the intermittent driving control circuit generates the switching signal based on a ratio of an ON period, during which the motor is supplied with a predetermined amount of current, to an OFF period, during which the motor is supplied with an amount of current reduced from the predetermined amount. 5. The circuit according to claim 4, wherein the intermittent drive control circuit includes: a clock generation circuit for generating a clock signal; and a timing generation circuit, connected to the clock generation circuit, for generating the switching signal, with a pulse width corresponding to the ratio of the ON period and the OFF period, based on the clock signal and the ratio of the ON period and the OFF period. 6. The circuit according to claim 4, further comprising a tracking servo mode for having the motor perform a plurality of requested operations, wherein the intermittent drive control circuit varies the ratio of the ON period and the OFF period in accordance with a selected one of the requested operations during the tracking servo mode. 7. The circuit according to claim 6, wherein: the plurality of requested operations includes an operation for having the pickup unit perform a long jump; and the intermittent drive control circuit sets the ratio of the OFF period relative to the ON period to a small value when the long jump is requested. 8. The circuit according to claim 6, wherein: the plurality of requested operations includes an operation for having the pickup unit perform a short jump; and the intermittent drive control circuit sets the ratio of the OFF period relative to the ON period to a large value when the short jump is requested. 9. The circuit according to claim 6, wherein: the plurality of requested operations includes a pause state for holding the pickup unit at a constant position; and the intermittent drive control circuit sets the ratio of the OFF period relative to the ON period to a large value or sets the ON period to zero when the pause state is requested. 10. The circuit according to claim 6, wherein: the pickup unit includes a sled, moved along the radial direction of the optical disc when the motor is driven, and an optical pickup, movably attached to the sled; and the intermittent drive control circuit sets the ratio of the OFF period relative to the ON period to a large value when moving the optical pickup on the sled within a movable range, and sets the ratio of the OFF period relative to the ON period to a small value when moving the sled. 11. A method for controlling a motor, the method comprising: generating a current setting signal for driving the motor so as to control the motor in a tracking servo mode, including a plurality of requested operations, to move an optical pickup unit along a radial direction of an optical disc, wherein the optical pickup unit is used to record data to the optical disc and/or reproduce the data recorded on the optical disc, and the motor is driven by a motor driver; setting a ratio of an ON period, during which the motor is supplied with a predetermined amount of current, to an OFF period, during which the motor is supplied with an amount of current reduced from the predetermined amount; selectively providing the motor driver with the current setting signal and a current reducing signal for reducing current for driving the motor based on the set ratio; and varying the ratio of the ON period and the OFF period in accordance with a selected one of the requested operations during the tracking servo mode. 12. A method for controlling a motor, the method comprising: generating a current setting signal for driving the motor so as to control the motor for moving an optical pickup unit along a radial direction of an optical disc, wherein the optical pickup unit is used to record data to the optical disc and/or reproduce the data recorded on the optical disc, and the motor is driven by a motor driver; setting a ratio of an ON period, during which the motor is supplied with a predetermined amount of current, to an OFF period, during which the motor is supplied with an amount of current reduced from the predetermined amount; selectively providing the motor driver with the current setting signal and a current reducing signal for reducing current for driving the motor based on the set ratio.
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