CN101645288B - Device and method for homing moving block in optical driver - Google Patents
Device and method for homing moving block in optical driver Download PDFInfo
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- CN101645288B CN101645288B CN2009101705259A CN200910170525A CN101645288B CN 101645288 B CN101645288 B CN 101645288B CN 2009101705259 A CN2009101705259 A CN 2009101705259A CN 200910170525 A CN200910170525 A CN 200910170525A CN 101645288 B CN101645288 B CN 101645288B
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Abstract
The invention provides a device and a method for homing a moving block in an optical driver. The device for homing the moving block comprises a processing unit, a motor driver, a block, a block motor and a current detection device, wherein, the processing unit is capable of outputting a control signal; the motor driver can generate a driving voltage according to the control signal; the block motor can generate a drive current according to the driving voltage and drive the block to move; the current detection device can receive the drive current and transform the drive current into an index signal and output to the processing unit; and when the processing unit performs a block homing action, the processing unit can be informed of the level of the drive current according to the index signal to judge whether the block homing is completed or not. The invention is applicable to the optical driver without a limit switch, can effectively reduce the time spent on block homing action, and can effectively prevent the damage of a spiral guide rod or the block.
Description
Technical field
The present invention relates to control device and method in a kind of CD drive, relate in particular to the apparatus and method of movable block playback in a kind of CD drive.
Background technology
In general, when CD was written into CD drive, CD drive must be carried out start-up routine (start-up procedure).When carrying out start-up routine, CD drive can begin rotary CD and control optical read/write head (optical pick-up head) some light laser, and laser spot is focused on the CD of rotation, in order to kind and the relevant controlled variable of judging CD.And the kind of CD can be read-only type (read only), writable disposable type (write once), can manifolding type (rewritable) CD, DVD or Blu-ray Disc.
Moreover in being written into CD before carry out start-up routine, CD drive must be carried out spindle drive motor (spindle motor) shut down procedure and coaster playback (move-sled-home) action in regular turn.After confirming that spindle drive motor does not rotate and coaster playbacks, CD drive can begin to carry out start-up routine.
Please with reference to Figure 1A, it is shown to be known CD drive internal mechanism synoptic diagram.Comprise a spindle drive motor 20, a guide rail 30, a coaster 40, a limit switch (limit switch) 50, spiral guide rod 60, coaster motor (sled motor) 70 in the CD drive.Wherein, comprise an optical read/write head 42 on the coaster 40, it can be launched laser light and focus on the CD (shown in the dotted line).
It promptly is that CD is placed spindle drive motor 20 tops that CD is written into CD drive, and drives and rotary CD via spindle drive motor 20.Moreover, coaster motor 70 rotatable spiral guide rods 60.And coaster 40 is by guide rail 30 and 60 supports of spiral guide rod, and is may command coaster 40 radially moving forward and backward in CD via coaster motor 70 different sense of rotation.
Shown like Figure 1B, for known CD drive is carried out coaster playback (move-sled-home) action synoptic diagram.When known CD drive was carried out coaster playback action, coaster motor 70 can move with the inner ring of control coaster 40 toward CD in rotation.When coaster 40 arrived the CD inner rings, coaster 40 can touch limit switch 50, made limit switch 50 actions, and therefore, whether CD drive can move according to limit switch 50 and decide coaster 40 completion of whether playbacking.
Moreover in order to reduce the cost of CD drive, some CD drive design manufacturer can omit limit switch.After limit switch omitted, clearly, whether CD drive can't the limit of utilization switch motion decides the coaster completion of whether playbacking.
In order to let the CD drive that does not possess limit switch still can carry out coaster playback action; When known CD drive is carried out coaster playback action each time, can within the playback time, provide a fixed voltage (constant voltage) to the coaster motor.Because when CD drive was carried out coaster playback action, CD drive can't be confirmed the physical location of coaster, above-mentioned fixed voltage and playback time must be able to guarantee that coaster can move to the inner ring of CD by the CD outmost turns.And, therefore, when coaster moves to inner ring of CD, will touch spindle drive motor because CD drive has not possessed limit switch.
Yet CD drive is carried out coaster when action playback at every turn, and coaster is not each all in the outmost turns of CD.Therefore, most of when carrying out coaster playback action, all can cause the collision of coaster and spindle drive motor.When supposing that CD drive is carried out coaster playback action, therefore coaster very near the inner ring of CD, still must just can lose time through the wait of above-mentioned playback time very much.Moreover behind coaster bump spindle drive motor, the coaster motor still continues to receive fixed voltage, is easy to cause the damage of spiral guide rod or coaster.
Summary of the invention
The object of the invention proposes the apparatus and method of movable block playback in a kind of CD drive.The present invention is applied to not possess the CD drive of limit switch, and its drive current that can detect the coaster motor is learnt the coaster completion of whether having playbacked, and in confirming that the coaster playback stops the running of coaster motor when accomplishing.
Therefore, the present invention proposes the device of movable block playback in a kind of CD drive, comprising: a processing unit, export a control signal; One motor driver produces a driving voltage according to this control signal; One coaster; One coaster motor produces a drive current and drives this coaster according to this driving voltage and moves; And a current sensing means comprises: one detects resistance, receive this drive current and produce an analog detection voltage, and a converting unit, receive this analog detection voltage and convert an indicator signal into; Wherein, After this processing unit is carried out coaster playback one cycle time of action; This processing unit is learnt the size of this drive current according to this indicator signal, and when this drive current during greater than a threshold current, confirms that this coaster playback accomplishes and stop to export this control signal.
Moreover the present invention also proposes the device of movable block playback in a kind of CD drive, comprising: a processing unit, and export a control signal and and select signal; One first driver element produces first driving voltage according to this control signal; One second driver element produces second driving voltage according to this control signal; One coaster; One coaster motor produces a coaster motor drive current and drives this coaster according to this first driving voltage and moves; One spindle drive motor produces a spindle drive motor drive current according to this second driving voltage; And a current sensing means comprises: one first detects resistance, receives this coaster motor drive current and produces one first analog detection voltage; One second detects resistance, receives this spindle drive motor drive current and produces one second analog detection voltage; One multiplexed unit receives this first analog detection voltage and this second analog detection voltage and exports this first analog detection voltage or this second analog detection voltage according to this selection signal; And a converting unit, receive this first analog detection voltage or this second analog detection voltage and convert an indicator signal into; Wherein, After this processing unit is carried out coaster playback one cycle time of action; This processing unit can be learnt the size of this coaster motor drive current according to this indicator signal, and when this drive current during greater than a threshold current, confirms that this coaster playback accomplishes and stop to export this control signal; When this processing unit was carried out a spindle drive motor shut down procedure, this processing unit can learn that whether the size of this spindle drive motor drive current stops in order to judging this spindle drive motor according to this indicator signal.
Moreover the present invention also proposes the method for movable block playback in a kind of CD drive, comprises the following steps: to provide a coaster motor one driving voltage in order to produce a drive current and to drive a coaster; After cycle time, when this drive current is not less than a threshold current, confirm that this coaster has playbacked to accomplish and stop to provide this driving voltage to make this coaster motor shut down; And, after this time cycle and this drive current during, then when this drive current rises to greater than this threshold current, confirm that this coaster has playbacked to accomplish and stop to provide this driving voltage to make this coaster motor shut down less than a threshold current.
The present invention is applied to not possess the CD drive of limit switch; Its drive current that can detect the coaster motor is learnt the coaster completion of whether having playbacked; And in confirming that the coaster playback stops the running of coaster motor immediately when accomplishing; Make the spended time of coaster playback action reduce effectively, and can prevent the damage of spiral guide rod or coaster effectively.
In order further to understand characteristic of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provides reference and explanation, is not to be used for the present invention is limited.
Description of drawings
Figure 1A is shown to be known CD drive internal mechanism synoptic diagram.
Figure 1B is shown to be that known CD drive is carried out coaster playback action synoptic diagram.
Shown in Figure 2ly go out to be the direct current motor schematic equivalent circuit.
The movable block homing device that goes out for first embodiment of the invention shown in Figure 3.
Fig. 4 A and Fig. 4 B are shown to be the signal schematic representation among first embodiment.
The process flow diagram that goes out for Fig. 4 A and Fig. 4 B movable block method for homing shown in Figure 5.
Fig. 6 A and Fig. 6 B are shown to be the signal schematic representation among first embodiment.
The process flow diagram that goes out for Fig. 6 A and Fig. 6 B movable block method for homing shown in Figure 7.
The movable block homing device that goes out for second embodiment of the invention shown in Figure 8.
Description of reference numerals in the above-mentioned accompanying drawing is following:
20 spindle drive motors, 30 guide rails
40 coasters, 42 optical read/write heads
50 limit switches, 60 spiral guide rods
70 coaster motor
120 processing units, 130 motor drivers
140 current sensing meanss, 142 converting units
220 processing units, 230 motor drivers
232 first driver elements, 234 second driver elements
240 current sensing meanss, 242 converting units
246 multiplexed unit
Embodiment
Please with reference to Fig. 2, it is shown to be the direct current motor schematic equivalent circuit.Wherein, Ra is an armature resistance, and La is an armature inductance, and Ea is a back electromotive force, and Ia is a drive current, and Va is a driving voltage, and ω is an angular velocity.Wherein, driving voltage can be expressed as:
(s domain) can get through deriving in the s territory:
Wherein, EA=Kb ω, Kb are back electromotive force constant.
Can know by (2) formula, when direct current motor does not rotate, ω=0, Ea=0.At this moment, drive current Ia rises to a saturation drive current Ia_sat, and saturation drive current can be expressed as:
Because the coaster motor in the CD drive is a direct current motor, so the present invention is that (3) formula capable of using is used as judging the coaster completion of whether playbacking.
Please with reference to Fig. 3, it is shown to be the movable block homing device of first embodiment of the invention.The movable block homing device comprises a processing unit 120, a motor driver 130, a coaster motor M1, a current sensing means 140.Current sensing means 140 comprises that also one detects a resistance R 1 and a converting unit 142.Wherein, processing unit 120 is a digital signal processing unit (DSP), and converting unit 142 is an analog-to word cell (ADC).
As shown in Figure 3; When processing unit 120 was carried out coaster playback action, processing unit 120 outputs one controlled signal to motor driver 130, therefore; Motor driver 130 output one driving voltage Va, and produce a drive current Ia and make coaster motor M1 rotation and then drive coaster.Moreover one in the current sensing means 140 detects resistance R 1 and produces detection voltage to the converting unit 142 of a simulation according to drive current Ia, and the detection voltage transitions that converting unit 142 then will be simulated becomes indicator signal to the processing unit 120 of numeral.
Clearly, proportional relation between the size of indicator signal and the drive current Ia, processing unit 120 can be learnt the size of drive current Ia according to indicator signal.Moreover, can know that by the drive current Ia characteristic of coaster motor M1 when the coaster playback is accomplished, can touch spindle drive motor and make coaster motor M1 no longer rotate, the drive current Ia of this moment can rapidly increase to saturation drive current Ia_sat.Therefore, can set a threshold current Ith in the processing unit 120, and as the foundation of judging whether coaster playbacks and accomplish.
Also promptly, as drive current Ia during less than threshold current Ith, judge coaster as yet playback accomplish, and processing unit 120 continues to produce and controls signal to motor driver 130 and make coaster motor M1 continue rotation; Otherwise, when drive current Ia rises to threshold current Ith, judge coaster completions of having playbacked, and processing unit 120 stops generation and controls signal to motor driver 130 and make coaster motor M1 stop the rotation.
Please with reference to Fig. 4 A and Fig. 4 B, it is shown to be the signal schematic representation among first embodiment.Because when carrying out coaster playback action, CD drive can't be learnt the tram of coaster, so Fig. 4 A is depicted as the not signal schematic representation when inner ring of CD circle of coaster, and the signal schematic representation of Fig. 4 B when being depicted as coaster and being positioned at the inner ring of CD circle.
Shown in Fig. 4 A, when time point t0, CD drive begins to carry out coaster playback action, so motor driver 130 produces driving voltage Va.When time point t0, though coaster motor M1 receives driving voltage Va, because the effect of the stiction of coaster motor M1 itself, coaster motor M1 can not rotate at once.At this moment, drive current Ia is saturation drive current Ia_sat.
Behind the stiction that overcomes coaster motor M1, coaster motor M1 begins rotation makes coaster move toward the CD inner ring, and the drive current Ia of this moment begins to descend.Therefore, processing unit 120 needs a preset time cycle T, and the time point t1 after this time cycle T just begins to detect the drive current Ia of coaster motor M1.
Between time point t1 to t2, the coaster motor continues in the rotation, and drive current Ia is less than preset threshold current Ith.
When time point t2, the collision of coaster and spindle drive motor causes coaster to stop and the coaster motor can't rotate, drive current Ia fast rise.When time point t3, drive current Ia rises to preset threshold current Ith, and processing unit 120 confirms that the coasters playback accomplishes, and stops to produce control signal, so driving voltage Va and drive current Ia make zero.
Shown in Fig. 4 B, when time point t0, CD drive begins to carry out coaster playback action, so motor driver 130 produces driving voltage Va.When time point t0, coaster motor M1 has been positioned at the inner ring position of CD and has contacted with spindle drive motor, though coaster motor M1 receives driving voltage Va, because coaster motor M1 can not rotate.At this moment, drive current Ia can maintain saturation drive current Ia_sat always.
During time point t1 after period of time T, processing unit 120 detects the drive current Ia of coaster motor M1 still greater than preset threshold current Ith.This moment, processing unit 120 confirmed that the coasters playback accomplishes, and stopped to produce control signal, so driving voltage Va and drive current Ia make zero.
Please with reference to Fig. 5, it is shown to be the process flow diagram of above-mentioned movable block method for homing.When CD drive began to carry out coaster playback action, processing unit 120 promptly produced and controls signal to motor driver 130 with outputting drive voltage Va, like step S10.
After through preset period of time T, processing unit 120 can be learnt the drive current Ia of coaster motor M1 according to the indicator signal of current sensing means 140 outputs.
As drive current Ia during greater than the preset threshold current Ith of processing unit 120, like step S12, processing unit 120 confirms that the coasters playback accomplishes, like step S16.Otherwise as drive current Ia during less than the preset threshold current Ith of processing unit 120, like step S12, processing unit 120 confirms that the coaster motor continue in the rotation, and processing unit 120 continues to detect drive current Ia.
Then, when drive current Ia continued to be less than or equal to the preset threshold current Ith of processing unit 120, like step S14, processing unit 120 confirmed that the coaster motor continue in the rotation, and gets back to step S14.Otherwise as drive current Ia during greater than the preset threshold current Ith of processing unit 120, like step S14, processing unit 120 confirms that the coasters playback accomplishes, like step S16.
Please with reference to Fig. 6 A and Fig. 6 B, it is shown to be the signal schematic representation among first embodiment.Wherein, processing unit 120 obtains threshold current Ith after between the period of time T saturation drive current I_sat being deducted a preset deviate Δ i.In like manner, because when carrying out coaster playback action, CD drive can't be learnt the tram of coaster, so Fig. 6 A is depicted as the not signal schematic representation when inner ring of CD circle of coaster, and the signal schematic representation of Fig. 6 B when being depicted as coaster and being positioned at the inner ring of CD circle.
Shown in Fig. 6 A, when time point t0, CD drive begins to carry out coaster playback action, so motor driver 130 produces driving voltage Va.When time point t0, though coaster motor M1 receives driving voltage Va, because the effect of the stiction of coaster motor M1 itself, coaster motor M1 can not rotate at once.At this moment, drive current Ia is saturation drive current Ia_sat.At this moment, processing unit 120 can be learnt the size of saturation drive current Ia_sat according to the indicator signal of current sensing means 140 output, and deducts preset deviate Δ i and obtain a threshold current Ith.
Behind the stiction that overcomes coaster motor M1, coaster motor M1 begins rotation makes coaster move toward the CD inner ring, and the drive current Ia of this moment begins to descend.Therefore, processing unit 120 needs a preset time cycle T, and the time point t1 after this time cycle T just begins to detect the drive current Ia of coaster motor M1.
Between time point t1 to t2, the coaster motor continues in the rotation, and drive current Ia is less than threshold current Ith.
When time point t2, the collision of coaster and spindle drive motor causes coaster to stop and the coaster motor can't rotate, drive current Ia fast rise.When time point t3, drive current Ia rises to threshold current Ith, and processing unit 120 confirms that the coasters playback accomplishes, and stops to produce control signal, so driving voltage Va and drive current Ia make zero.
Shown in Fig. 6 B, when time point t0, CD drive begins to carry out coaster playback action, so motor driver 130 produces driving voltage Va.When time point t0, coaster motor M1 has been positioned at the inner ring position of CD and has contacted with spindle drive motor, though coaster motor M1 receives driving voltage Va, because coaster motor M1 can not rotate.At this moment, drive current Ia can maintain saturation drive current Ia_sat always.
During time point t1 after period of time T, processing unit 120 detects the drive current Ia of coaster motor M1 still greater than threshold current Ith.This moment, processing unit 120 confirmed that the coasters playback accomplishes, and stopped to produce control signal, so driving voltage Va and drive current Ia make zero.
Please with reference to Fig. 7, it is shown to be the process flow diagram of above-mentioned movable block method for homing.When CD drive began to carry out coaster playback action, processing unit 120 promptly produced and controls signal to motor driver 130 with outputting drive voltage Va, like step S20.
Between the period of time T that processing unit 120 is preset; Processing unit 120 can be learnt the saturation drive current Ia_sat of coaster motor M1 according to the indicator signal of current sensing means 140 outputs; And and then saturation drive current Ia_sat deducted preset deviate Δ i and obtains a threshold current Ith, like step S22.
After the period of time T that processing unit 120 is preset, processing unit 120 can be learnt the drive current Ia of coaster motor M1 according to the indicator signal of current sensing means 140 outputs.
As drive current Ia during greater than threshold current Ith, like step S24, processing unit 120 confirms that the coasters playback accomplishes, like step S28.Otherwise as drive current Ia during less than threshold current Ith, like step S24, processing unit 120 confirms that the coaster motor continue in the rotation, and processing unit 120 continues to detect drive current Ia.
Then, when drive current Ia continued to be less than or equal to threshold current Ith, like step S26, processing unit 120 confirmed that the coaster motor continues in the rotation, and gets back to step S26.Otherwise as drive current Ia during greater than threshold current Ith, like step S26, processing unit 120 confirms that the coasters playback accomplishes, like step S28.
Because carry out before the coaster playback action, CD drive must be carried out the spindle drive motor shut down procedure earlier.Because spindle drive motor also is a direct current motor, therefore, the present invention can apply to spindle drive motor stopped process and coaster playback action simultaneously.
Please with reference to Fig. 8, it is shown to be the movable block homing device of second embodiment of the invention.The movable block homing device comprises a processing unit 220, a motor driver 230, a coaster motor M1, a spindle drive motor M2, a current sensing means 240.Current sensing means 240 comprises that also one first detects resistance R 1, one second detection resistance R 2, one a multiplexed unit 246 and a converting unit 242.Motor driver 230 also comprises one first driver element 232 and one second driver element 234.Wherein, processing unit 220 is a digital signal processing unit (DSP), and converting unit 242 is an analog-to word cell (ADC).
As shown in Figure 8, control signal may command first driver element, the 232 output first driving voltage Va1 of processing unit 220 outputs and then control coaster motor M1 rotation are with movable block; Simultaneously, the control signal of processing unit 220 output also may command second driver element, the 234 output second driving voltage Va2 and then control spindle drive motor M2 rotation to drive the CD rotation.And the multiplexed unit 246 in the current sensing means 240 receives the selection signal that processing unit 220 is exported, and the second analog detection voltage that the first analog detection voltage or second that the detection resistance R 1 of winning is produced detects resistance R 2 generations may be output to converting unit 242.And the indicator signal of converting unit 242 outputs can be represented the first drive current Ia1 of coaster motor M1 or the second drive current Ia2 of spindle drive motor M2.
Also be; When CD drive is carried out the spindle drive motor shut down procedure; Select signal controlling multiplexed unit 246 outputs second to detect the second analog detection voltage that resistance R 2 produces, the indicator signal that makes converting unit 242 export is represented the second drive current Ia2 of spindle drive motor M2.When the second drive current Ia2 of spindle drive motor M2 was zero, processing unit 220 can confirm that spindle drive motor M2 stops.
Then, when processing unit 220 is carried out coaster playback action, select signal controlling multiplexed unit 246 outputs first to detect the first analog detection voltage that resistance R 1 produces.And processing unit 220 outputs control signals to first driver element 232, therefore, and first driver element 232 output, one first driving voltage Va1, and produce one first drive current Ia1 and make coaster motor M1 rotation.Moreover; In the current sensing means 240 first detects resistance R 1 and produces first analog detection voltage to the converting unit 242 according to the first drive current Ia1, and converting unit 242 then becomes the first analog detection voltage transitions indicator signal to the processing unit 220 of numeral.And processing unit 220 can be confirmed the coaster completion of whether playbacking according to the flow process of Fig. 5 or Fig. 7.
Can know that by second embodiment the present invention can only utilize single current sensing means promptly can detect the action situation of coaster motor and spindle drive motor, therefore, can save the number of current sensing means.
Moreover advantage of the present invention is the apparatus and method that propose movable block playback in a kind of CD drive.The present invention is applied to not possess the CD drive of limit switch; Its drive current that can detect the coaster motor is learnt the coaster completion of whether having playbacked; And in confirming that the coaster playback stops the running of coaster motor immediately when accomplishing; Make the spended time of coaster playback action reduce effectively, and can prevent the damage of spiral guide rod or coaster effectively.
In sum; Though the present invention discloses as above with preferred embodiment; Right its is not that any those of ordinary skills are not breaking away from the spirit and scope of the present invention in order to qualification the present invention; When can doing various changes and retouching, so protection scope of the present invention is as the criterion when looking appended the scope that claim defined.
Claims (13)
1. the device of movable block playback in the CD drive comprises:
One processing unit is exported a control signal;
One motor driver produces a driving voltage according to this control signal;
One coaster;
One coaster motor produces a drive current and drives this coaster according to this driving voltage and moves; And
One current sensing means comprises: one detects resistance, and receive this drive current and produce an analog detection voltage, and a converting unit, receive this analog detection voltage and convert an indicator signal into;
Wherein, After this processing unit is carried out coaster playback one cycle time of action; This processing unit is learnt the size of this drive current according to this indicator signal, and when this drive current during greater than a threshold current, confirms that this coaster playback accomplishes and stop to export this control signal.
2. device as claimed in claim 1, wherein in this time cycle, this threshold current obtains after deducting a preset deviate through a saturation drive current that when this coaster motor does not rotate as yet, is received.
3. device as claimed in claim 1, wherein this threshold current is preset in this processing unit.
4. device as claimed in claim 1, wherein this processing unit is a digital signal processing unit, and this converting unit is an analog-to word cell.
5. the device of movable block playback in the CD drive comprises:
One processing unit is exported a control signal and and is selected signal;
One first driver element produces one first driving voltage according to this control signal;
One second driver element produces one second driving voltage according to this control signal;
One coaster;
One coaster motor produces a coaster motor drive current and drives this coaster according to this first driving voltage and moves;
One spindle drive motor produces a spindle drive motor drive current according to this second driving voltage; And
One current sensing means comprises: one first detects resistance, receives this coaster motor drive current and produces one first analog detection voltage; One second detects resistance, receives this spindle drive motor drive current and produces one second analog detection voltage; One multiplexed unit receives this first analog detection voltage and this second analog detection voltage and exports this first analog detection voltage or this second analog detection voltage according to this selection signal; And a converting unit, receive this first analog detection voltage or this second analog detection voltage and convert an indicator signal into;
Wherein, After this processing unit is carried out coaster playback one cycle time of action; This processing unit is learnt the size of this coaster motor drive current according to this indicator signal, and when this drive current during greater than a threshold current, confirms that this coaster playback accomplishes and stop to export this control signal; When this processing unit was carried out a spindle drive motor shut down procedure, this processing unit was learnt according to this indicator signal and the size of this spindle drive motor drive current whether is stopped judging this spindle drive motor.
6. device as claimed in claim 5 wherein should be in the time cycle, and this threshold current obtains after deducting a preset deviate through a saturation drive current that when this coaster motor does not rotate as yet, is received.
7. device as claimed in claim 5, wherein this threshold current is preset in this processing unit.
8. device as claimed in claim 5, wherein this processing unit is a digital signal processing unit, and this converting unit is an analog-to word cell.
9. device as claimed in claim 5 when wherein this spindle drive motor drive current is zero, confirms that this spindle drive motor stops.
10. the method for movable block playback in the CD drive comprises the following steps:
Provide a coaster motor one driving voltage in order to produce a drive current and to drive a coaster;
After cycle time, when this drive current is not less than a threshold current, confirm that this coaster has playbacked to accomplish and stop to provide this driving voltage to make this coaster motor shut down; And
After this time cycle and this drive current during, then when this drive current rises to greater than this threshold current, confirm that this coaster has playbacked to accomplish and stop to provide this driving voltage to make this coaster motor shut down less than a threshold current.
11. method as claimed in claim 10 also comprises: when this coaster motor does not rotate as yet in this time cycle, obtain this threshold current after a saturation drive current that receives deducted a preset deviate.
12. method as claimed in claim 10 also comprises: before this this driving voltage of coaster motor is provided, carry out a spindle drive motor shut down procedure.
13. method as claimed in claim 10, wherein this threshold current is preset in the processing unit in this CD drive.
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| CN2009101705259A CN101645288B (en) | 2009-09-08 | 2009-09-08 | Device and method for homing moving block in optical driver |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101705259A CN101645288B (en) | 2009-09-08 | 2009-09-08 | Device and method for homing moving block in optical driver |
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| CN101645288A CN101645288A (en) | 2010-02-10 |
| CN101645288B true CN101645288B (en) | 2012-01-04 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601621A (en) * | 2003-09-23 | 2005-03-30 | 建兴电子科技股份有限公司 | Track locking control method after performing searching track for optical disk drive |
| CN1649015A (en) * | 2004-01-20 | 2005-08-03 | 建兴电子科技股份有限公司 | Method for controlling pulley homing in optic disc machine |
| CN1755807A (en) * | 2004-09-27 | 2006-04-05 | 联发科技股份有限公司 | Method and apparatus for detecting reset of optical pickup head of CD-ROM driver |
| CN1959826A (en) * | 2006-11-09 | 2007-05-09 | 凌阳科技股份有限公司 | Control circuit of limit switch in optical disk drive, and control method |
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2009
- 2009-09-08 CN CN2009101705259A patent/CN101645288B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1601621A (en) * | 2003-09-23 | 2005-03-30 | 建兴电子科技股份有限公司 | Track locking control method after performing searching track for optical disk drive |
| CN1649015A (en) * | 2004-01-20 | 2005-08-03 | 建兴电子科技股份有限公司 | Method for controlling pulley homing in optic disc machine |
| CN1755807A (en) * | 2004-09-27 | 2006-04-05 | 联发科技股份有限公司 | Method and apparatus for detecting reset of optical pickup head of CD-ROM driver |
| CN1959826A (en) * | 2006-11-09 | 2007-05-09 | 凌阳科技股份有限公司 | Control circuit of limit switch in optical disk drive, and control method |
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