CN103199782A - Stepping motor control method for laser pickup unit of disc player - Google Patents
Stepping motor control method for laser pickup unit of disc player Download PDFInfo
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- CN103199782A CN103199782A CN2013101017310A CN201310101731A CN103199782A CN 103199782 A CN103199782 A CN 103199782A CN 2013101017310 A CN2013101017310 A CN 2013101017310A CN 201310101731 A CN201310101731 A CN 201310101731A CN 103199782 A CN103199782 A CN 103199782A
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- pickup unit
- stepping motor
- laser
- laser pickup
- disc player
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Abstract
The invention compact discloses a stepping motor control method for a laser pickup unit of a compact disc player. The stepping motor control method comprises the following steps of (1) enabling a stepping motor to drive the laser pickup unit to move towards a set position of a compact disc along a lead screw of the stepping motor, (2) judging whether the laser pickup unit can reach the set position, (3) enlarging driving current of the stepping motor if the laser pickup unit can not reach the set position, and repeating step (1). The stepping motor control method for the laser pickup unit of the compact disc player can effectively overcome the shortcoming that the compact disc cannot be read due to the fact that friction force of the lead screw of the compact disc player is increased.
Description
Technical field
The present invention relates to area information storage, be specifically related to the method for controlling stepping motor of optical disc player laser pickup unit.
Background technology
The laser pickup unit of optical disc player servo system (shaven head), the screw mandrel along stepping motor in reading the process of laser disc moves forward and backward the driving that needs stepping motor (feeding motor).But, the situation that laser pickup unit can't arrive some position of laser disc appears through regular meeting.
Summary of the invention
Through discovering, no matter whether the framework of optical disc player assembling shaven head seals, the capital has pollutants such as dust and oil smoke to enter on the screw mandrel that is bonded at this stepping motor, for the framework that does not have sealing, the pollution that is bonded on the screw mandrel is even more serious, for the user of smoking, screw mandrel is subjected to the fume pollution especially severe.Have and the drive current of feeding motor can not be designed into maximum rating during the initial stage in the software design, this does not meet the design concept that reduces power consumption.
(plastic cement) threaded joints that is fixed on the laser pickup unit is enclosed within on the screw mandrel, under the driving of stepping motor, the rotation of the screw mandrel of stepping motor is converted into laser pickup unit along the rectilinear motion of screw mandrel, through further discovering, just because of existing these to pollute, the frictional force between screw mandrel and the laser pickup unit increases, thereby causes the screw mandrel of stepping motor can't rotational motion, thereby laser pickup unit can not be driven some position, and then can not read dish.
Through further discovering, because the quantity of the pollutant that distributes on the screw mandrel of stepping motor is normally unequal, for example the amount of pollutants at the front portion of screw mandrel, middle part and rear portion is normally different, and therefore, these different parts are also different with the frictional force of laser pickup unit.
For present stepping motor, under the situation of non-overload, frequency and the umber of pulse of pulse signal only depended in rotating speed of motor, the position that stops, control speed and the acceleration that motor rotates by the control impuls frequency, thereby reach the purpose of speed governing, if and the overload, under the very big situation of above-mentioned frictional force, stepping motor can't rotate.
In order to solve the problems of the technologies described above respectively, the invention provides the method for controlling stepping motor of optical disc player laser pickup unit, comprise the steps:
(1) desired location of stepping motor driving laser pickup unit along the screw mandrel of stepping motor towards laser disc moves;
(2) judge that can described laser pickup unit arrive described desired location;
(3) if can not arrive the drive current that described desired location then increases stepping motor, and execution in step (1) again.
In step (1), stepping motor driving laser pickup unit from the position, boot section of laser disc towards the desired location motion of laser disc.
Described desired location is the position of laser disc storage system file.
Described desired location is the outmost position that stores data of laser disc.
Also comprise the steps:
After described optical disc player powered on, stepping motor drove described laser pickup unit towards position, the boot section motion (the laser pickup unit resets) of laser disc;
Judge that can described laser pickup unit arrive the position, boot section, if can not then increase the drive current of stepping motor.
After step (3), the drive current after stepping motor keeps finally increasing in reading the process of laser disc.
In order to solve above-mentioned one of them technical problem, the present invention also provides the method for controlling stepping motor of optical disc player laser pickup unit, comprises the steps:
A. after optical disc player powered on, stepping motor driving laser pickup unit moved towards the position, boot section of laser disc along the screw mandrel of stepping motor;
B. judge that can described laser pickup unit arrive the position, boot section;
C. if described laser pickup unit can not arrive the drive current that the position, boot section then increases stepping motor, and execution in step a again.
The invention has the beneficial effects as follows: can be driven to the position of setting by judging laser pickup unit, thereby judge whether the frictional force that the screw mandrel of stepping motor is subjected to is excessive, and make screw mandrel freely to rotate by the increase drive current; By judging that can laser pickup unit arrive the position of the system file address of laser disc, adjust the drive current of stepping motor when thereby the frictional force that can be subjected at screw mandrel is big, make laser pickup unit to the motion of system file address simultaneously, thereby saved the time of reading dish; Can arrive the position that optical disc storage has the maximum address of data by the judgement laser pickup unit, thereby adjust drive current, guarantee that laser pickup unit can move freely at whole section screw mandrel.The present invention can effectively overcome the defective that can't read dish because screw mandrel frictional force increases.
Description of drawings
Fig. 1 is the flow chart of method for controlling stepping motor of the optical disc player laser pickup unit of an embodiment of the present invention;
Fig. 2 is the flow chart of method for controlling stepping motor of the optical disc player laser pickup unit of the another kind of embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, specific embodiments of the invention are described in further detail.
As shown in Figure 1, the method for controlling stepping motor of the optical disc player laser pickup unit of a kind of embodiment comprises the steps:
(1) the desired location motion of stepping motor driving laser pickup unit from some original positions towards laser disc, in the process of motion, laser pickup unit can be noted the orbital distance of process on laser disc, for example, 10 ten thousand orbital motions of stepping motor driving laser pickup unit from 50,000 tracks of laser disc to laser disc, make the screw mandrel of stepping motor to rotate if the frictional force between screw mandrel and the laser pickup unit is big, the some positions in the middle of thereby laser pickup unit has been parked in, 70,000 tracks of laser disc for example illustrate then that instantly the frictional force between screw mandrel and laser pickup unit is very big and screw mandrel can't be rotated further.
(2) judge that can described laser pickup unit arrive described desired location, if laser pickup unit can't arrive 100,000 tracks of laser disc, laser pickup unit can read the orbital distance of process this moment, thereby determines whether laser pickup unit has arrived desired location.
(3) if laser pickup unit can not arrive described desired location, then increase the drive current of stepping motor, thereby increase the screw mandrel rotatory force with overcome friction, if this moment, screw mandrel can be rotated further, and can arrive desired location smoothly by the driving laser pickup unit, then not need further to increase drive current; Otherwise, if screw mandrel still can not rotate, perhaps after turning an angle, stopping again, laser pickup unit still can't arrive desired location, thereby needs further to increase the drive current of stepping motor, can arrive desired location until laser pickup unit.
In another embodiment, in step (1), stepping motor driving laser pickup unit from the position, boot section of laser disc towards the desired location motion of laser disc.Because optical disc player usually can be driven into laser pickup unit the position, boot section of laser disc earlier in reading the process of laser disc, and then be that relative position is demarcated the position of laser disc zero point with the position, boot section.
Optical disc player is in the process of rom read, usually at first need to arrive the position of laser disc storage system file, this system file records the data of laser disc storage and the mapping relations of corresponding address, when reading certain data, can find corresponding address rapidly, read data thereby the driving laser pickup unit arrives this corresponding address.This system file is usually near 100,000 tracks of laser disc, like this, laser pickup unit just can be finished the adjustment to the drive current of stepping motor in the process of reading system file, saved the time, can guarantee that again laser pickup unit can move in a big way.
But because the quantity of the pollutant that distributes on the screw mandrel is different, the screw mandrel position of position correspondence of outermost end that stores data at laser disc is may pollutant more, therefore, have only the laser pickup unit can unimpeded movement on whole section screw mandrel, could guarantee the normal of rom read, therefore, the position that desired location is set at outermost end is the most reliable, but whole process time can be longer.
In some cases, for example optical disc player power down suddenly in the course of the work, laser pickup unit can rest on certain centre position of laser disc, when powering on etc. next optical disc player, stepping motor needs the driving laser pickup unit towards position, the boot section motion of laser disc, if the position pollutant that screw mandrel or screw mandrel contact with laser pickup unit in power down and next time powering on during this period of time increases to some extent, and the frictional force that is subjected to when causing screw mandrel to rotate increases, and laser pickup unit also might can't arrive the position, boot section of laser disc.Therefore, need also in this process to judge that can described laser pickup unit arrive the position, boot section, if can not then increase the drive current of stepping motor, concrete steps are similar to the step of previous embodiment, can arrive the position, boot section until laser pickup unit.
After by the increase drive current, laser pickup unit can be free under the situation that screw mandrel moves freely, after this drive current after stepping motor all keeps increasing in reading the process of laser disc, can adopt the drive current after this increase next time when optical disc player powers on, perhaps do not adopt this drive current.
Claims (7)
1. the method for controlling stepping motor of optical disc player laser pickup unit is characterized in that, comprises the steps:
(1) desired location of stepping motor driving laser pickup unit along the screw mandrel of stepping motor towards laser disc moves;
(2) judge that can described laser pickup unit arrive described desired location;
(3) if described laser pickup unit can not arrive the drive current that described desired location then increases stepping motor, and execution in step (1) again.
2. the method for controlling stepping motor of optical disc player laser pickup unit as claimed in claim 1 is characterized in that:
In step (1), stepping motor driving laser pickup unit from the position, boot section of laser disc towards the desired location motion of laser disc.
3. the method for controlling stepping motor of optical disc player laser pickup unit as claimed in claim 1 or 2, it is characterized in that: described desired location is the position of the storage system file of laser disc.
4. the method for controlling stepping motor of optical disc player laser pickup unit as claimed in claim 1, it is characterized in that: described desired location is the outmost position that stores data of laser disc.
5. the method for controlling stepping motor of optical disc player laser pickup unit as claimed in claim 2 is characterized in that, also comprises the steps:
After optical disc player powered on, stepping motor drove described laser pickup unit towards position, the boot section motion of laser disc;
Judge that can described laser pickup unit arrive the position, boot section, if can not then increase the drive current of stepping motor.
6. the method for controlling stepping motor of optical disc player laser pickup unit as claimed in claim 1 is characterized in that, after step (3), and the drive current after stepping motor keeps finally increasing in reading the process of laser disc.
7. the method for controlling stepping motor of optical disc player laser pickup unit is characterized in that, comprises the steps:
A. after optical disc player powered on, stepping motor driving laser pickup unit moved towards the position, boot section of laser disc along the screw mandrel of stepping motor;
B. judge that can described laser pickup unit arrive the position, boot section;
C. if described laser pickup unit can not arrive the drive current that the position, boot section then increases stepping motor, and execution in step a again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101017310A CN103199782A (en) | 2013-03-27 | 2013-03-27 | Stepping motor control method for laser pickup unit of disc player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101017310A CN103199782A (en) | 2013-03-27 | 2013-03-27 | Stepping motor control method for laser pickup unit of disc player |
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| Publication Number | Publication Date |
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| CN103199782A true CN103199782A (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013101017310A Pending CN103199782A (en) | 2013-03-27 | 2013-03-27 | Stepping motor control method for laser pickup unit of disc player |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003515A (en) * | 2020-07-21 | 2020-11-27 | 珠海格力电器股份有限公司 | Air conditioner and control method of air conditioner stepping motor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6154424A (en) * | 1998-02-27 | 2000-11-28 | Mediatek, Inc. | Control device of a pickup head for locating the track position |
| US20040257947A1 (en) * | 2003-06-20 | 2004-12-23 | Motorola, Inc. | Decoupling technique for optical disk drive optical pickup units |
| TW200606820A (en) * | 2004-05-04 | 2006-02-16 | Koninkl Philips Electronics Nv | Rail friction calibration |
| JP2007521596A (en) * | 2003-06-30 | 2007-08-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Disk drive with improved tray control |
-
2013
- 2013-03-27 CN CN2013101017310A patent/CN103199782A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6154424A (en) * | 1998-02-27 | 2000-11-28 | Mediatek, Inc. | Control device of a pickup head for locating the track position |
| US20040257947A1 (en) * | 2003-06-20 | 2004-12-23 | Motorola, Inc. | Decoupling technique for optical disk drive optical pickup units |
| JP2007521596A (en) * | 2003-06-30 | 2007-08-02 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Disk drive with improved tray control |
| TW200606820A (en) * | 2004-05-04 | 2006-02-16 | Koninkl Philips Electronics Nv | Rail friction calibration |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112003515A (en) * | 2020-07-21 | 2020-11-27 | 珠海格力电器股份有限公司 | Air conditioner and control method of air conditioner stepping motor |
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Application publication date: 20130710 |