CN1601621A - Track locking control method after performing searching track for optical disk drive - Google Patents
Track locking control method after performing searching track for optical disk drive Download PDFInfo
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- CN1601621A CN1601621A CN 03159704 CN03159704A CN1601621A CN 1601621 A CN1601621 A CN 1601621A CN 03159704 CN03159704 CN 03159704 CN 03159704 A CN03159704 A CN 03159704A CN 1601621 A CN1601621 A CN 1601621A
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- coaster
- drive
- light signal
- frequency
- lock
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Abstract
In the invention, actual velocity of tackle is calculated out from optical signal on tackle motor. After operation of seeking track in long range and before optical read/write head carries out operation of locking track, optical disc drive must determine the said actual velocity is lower than a threshold value of velocity, then operation of locking track is possible to implement.
Description
Technical field
The present invention is relevant for the lock orbit control method in the CD drive, and particularly relevant for the lock orbit control method behind the long distance tracking in the CD drive.
Background technology
CD is the medium of random access fast (Random Access).In order to reach this requirement, CD drive is necessary can be at any time with the fastest speed, utilize rail searching servo system (Seeking Servo), after accurately coaster (Sledge) being delivered to the target location, carry out lock rail (Track On) operation of optical read/write head by tracking servo (Tracking Servo) catcher.
For instance, please refer to Fig. 1, it represents that conventional optical read/write head locks the synoptic diagram of rail operation.In general, CD drive is carried out the lock rail of optical read/write head 24 to the target location by tracking servo by rail searching servo system control coaster 26 when making long distance tracking (Long Seek).And on coaster 26, have a mobile range 27 to provide optical read/write head 24 as lock rails, tracking (Following) or the short fine setting scope of optical read/write head 24 when jumping onto the tracks (Short Seek).In general, optical read/write head is without any control the time, and flexible member 25 can be controlled the middle position that optical read/write head 24 rests on mobile range 27.And in Fig. 1, after coaster 26 moved to the target location, tracking servo was that the may command optical read/write head pins the target track 23 on the CD 22.
In general, under rail searching servo system control, stride the track number that optical read/write head 24 that on behalf of coaster, rail error (Tracking Error) signal drive had been crossed over.When optical read/write head 24 strides across a track, stride the rail error signal and can pass through zero crossing (Zero Cross Point), present a sine wave.Therefore, when long distance tracking, CD drive can be striden sinusoidal wave number in the rail error signal according to calculating and be estimated gap between optical read/write head and the target location, and locks the rail operation when optical read/write head arrives the target location.
Please refer to Fig. 2, coaster motor acting force curve synoptic diagram during its expression CD drive carries out long path orbit searching.In order to control the coaster operation, a coaster motor force signals is provided in the CD drive, and (FeedMotor Output FMO) gives the coaster motor and drives coaster.In order to reach the data on the quick access CD, when CD drive begins carries out long path orbit searching (t0-t1), coaster motor force signals must provide bigger acting force to drive coaster; When coaster arrived target location (t1) soon, coaster motor force signals must reduce acting force gradually.When coaster arrived the target location, because the speed of coaster reduces, optical read/write head just can be locked the rail operation smoothly.
In general, CD drive judges that the speed of coaster decides according to striding the rail error signal.Because optical read/write head when striding across a track, is striden the rail error signal and can be passed through zero crossing (Zero Cross Point) and present a sine wave, therefore, promptly can converse the speed of coaster according to sinusoidal wave frequency.With Fig. 2 coaster motor acting force curve, between t0 to t1, stride the rail error signal and have high-frequency sine wave; After t1, sinusoidal wave frequency can reduce gradually.Therefore, the coaster speed that can determine this moment after the frequency of striding the rail error signal is reduced to a characteristic frequency can have been carried out the operation of lock rail.
Yet aforementioned calculation is striden the method for rail error signal sine wave freuqency, in fact has error.Because only have a flexible member to be connected between optical read/write head and the coaster, when the stressed high-speed mobile of coaster, optical read/write head can rock between mobile range brokenly.Be about to carry out the operation of lock rail but coaster speed no show still can lock rail speed the time when optical read/write head, suppose that this moment optical read/write head is opposite with coaster direction of motion, it is obviously lower to cause CD drive to lock detected sine wave freuqency of striding the rail error signal.If CD drive was thought that coaster speed has been reduced to and was enough to lock rail operation and locks the rail operation this moment, because coaster still has certain speed, therefore, be subjected to the influence of coaster inertia, optical read/write head is locked on track smoothly not only, more may cause optical read/write head non-steady state of vibration back and forth between mobile range.
Because the direction of motion between coaster and the optical read/write head is uncertain, therefore, strides the coaster speed that the sine wave freuqency size is reflected in the rail error signal and can produce error, cause CD drive to carry out lock rail operation failure.
Summary of the invention
Purpose of the present invention provides the lock orbit control method after a kind of CD drive carries out long path orbit searching, make CD drive when carrying out the operation of lock rail, the speed of determining coaster is under a threshold velocity, in order to solve routine to stride the lock rail operation failure that the rail error signal judges that coaster speed is caused.
The present invention proposes the device of the lock orbit control method after a kind of CD drive carries out long path orbit searching, it is summarized as follows: when CD drive will be carried out the operation of lock rail, the light signal that utilizes rotation coaster motor to be produced obtained the actual speed of coaster in the CD drive; And, when actual coaster speed is lower than threshold velocity, carry out the operation of lock rail.
The present invention proposes the device of the lock orbit control method after a kind of CD drive carries out long path orbit searching, and it is summarized as follows: when CD drive will be carried out the operation of lock rail, the light signal that utilizes the rotation of coaster motor to be produced obtained the frequency of light signal; And, when frequency is lower than threshold frequency, carry out the operation of lock rail.
In order to enable further to understand feature of the present invention and technology contents, see also following about detailed description of the present invention and accompanying drawing, yet accompanying drawing only provide with reference to and the explanation usefulness, be not to be used for the present invention is limited.
Description of drawings
Fig. 1 represents that conventional optical read/write head locks the synoptic diagram of rail operation;
Coaster motor acting force curve synoptic diagram when Fig. 2 represents the CD drive carries out long path orbit searching;
Fig. 3 represents that the coaster motor drives the synoptic diagram of coaster;
Fig. 4 represents light signal generating device synoptic diagram; And
Fig. 5 represents the lock orbit control method after the CD drive carries out long path orbit searching of the present invention.
The figure number explanation
22 CDs, 23 target tracks
24 optical read/write heads, 25 flexible members
26 coasters, 27 mobile ranges
30 coaster motors, 32 screw rods
34 tooth bars, 36 circular gratings
40 optical transmitting sets, 42 photodetectors
46 light signals
Embodiment
Please refer to Fig. 3, its expression coaster motor drives the synoptic diagram of coaster.Wherein, there is a tooth bar 34 closely to contact on the coaster 26 with the screw rod 32 of coaster motor 30.When 30 rotations of coaster motor, can drive coaster 26 and move.When the CD drive carries out long path orbit searching, utilize the rotation of coaster motor 30 can drive coaster 26 and optical read/write head 26 moves.
Please refer to Fig. 4, its expression light signal generating device synoptic diagram.In order to detect the rotating speed of coaster motor, on coaster motor 30, insert a circular grating 36, and circular grating 36 can be done synchronous rotation with coaster motor 30.And install an optical transmitting set 40 and a photodetector 42 respectively in two sides of circular grating 36.When the light beam of optical transmitting set 40 constantly by circular grating 36 cuttings, photodetector 42 can detect the light signal (Photo signal) 46 that high-low level as shown in the figure replaces.Because the tooth bar of coaster closely contacts with screw rod, therefore, can also converse actual coaster speed according to the high-low level alternating frequency in the light signal 46.
Please refer to Fig. 5, the lock orbit control method after its represented CD drive carries out long path orbit searching of the present invention.
Step S1: when the CD drive carries out long path orbit searching is operated, calculate the number of tracks of striding that the sinusoidal wave number of striding in the rail error signal is confirmed optical read/write head;
Step S2: will carry out lock rail when operation when CD drive, utilize high-low level alternating frequency in the light signal to calculate the actual speed of coaster; And
Step S3: when the actual coaster speed of coaster is lower than a threshold velocity, carry out the operation of lock rail.
According to embodiments of the invention, the light signal that utilizes high-low level to replace can calculate the accurate actual speed of coaster.Therefore, can improve conventional the utilization and stride resultant inaccurate the getting the opportunity that coaster speed decides the operation of CD drive execution lock rail of rail error signal.And utilization the present invention, the chance that CD drive is carried out lock rail operation failure will significantly reduce.
Moreover the present invention calculates the actual speed of coaster except utilizing light signal.In fact, can also reach the present invention according to the frequency of light signal.For instance, can set a threshold frequency earlier in CD drive, when the frequency of light signal was lower than threshold frequency, CD drive also can be carried out the operation of lock rail.So, can carry out the operation of lock rail in the actual speed that need not obtain coaster.
Therefore, the present invention proposes the lock orbit control method after a kind of CD drive carries out long path orbit searching, and the light signal that utilizes high-low level to replace calculates the actual speed of coaster, makes CD drive can not judge the speed of coaster and successfully execution lock rail operation by accident.
In sum, though the present invention with preferred embodiment openly as above, right its is not in order to limit the present invention, any those skilled in the art, under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification, therefore scope of the present invention is as the criterion with the claim restricted portion that is proposed.
Claims (6)
1. the lock orbit control method after the CD drive carries out long path orbit searching comprises the following steps:
When a CD drive will be carried out a lock rail operation, a light signal that utilizes coaster motor rotation to be produced obtained an actual speed of a coaster in this CD drive; And
When this actual coaster speed is lower than a threshold velocity, carry out this lock rail operation.
2. the method for claim 1, wherein this actual speed is learnt according to the frequency that a high-low level in this light signal replaces.
3. the method for claim 1, wherein this light signal utilizes this coaster motor in a circular grating and this CD drive to rotate synchronously, and launch a light beam with an optical transmitting set in a side of this circle grating, and a photodetector produces after the opposite side of this circle grating receives this light beam.
4. the lock orbit control method after the CD drive carries out long path orbit searching comprises the following steps:
When a CD drive will be carried out a lock rail operation, a light signal that utilizes coaster motor rotation to be produced obtained the frequency of this light signal; And
When this frequency is lower than a threshold frequency, carry out this lock rail operation.
5. method as claimed in claim 4, wherein this frequency is the frequency that a high-low level replaces in this light signal.
6. method as claimed in claim 4, wherein this light signal utilizes this coaster motor in a circular grating and this CD drive to rotate synchronously, and launch a light beam with an optical transmitting set in a side of this circle grating, and a photodetector produces after the opposite side of this circle grating receives this light beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159704 CN1601621A (en) | 2003-09-23 | 2003-09-23 | Track locking control method after performing searching track for optical disk drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159704 CN1601621A (en) | 2003-09-23 | 2003-09-23 | Track locking control method after performing searching track for optical disk drive |
Publications (1)
| Publication Number | Publication Date |
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| CN1601621A true CN1601621A (en) | 2005-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03159704 Pending CN1601621A (en) | 2003-09-23 | 2003-09-23 | Track locking control method after performing searching track for optical disk drive |
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| CN (1) | CN1601621A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645288B (en) * | 2009-09-08 | 2012-01-04 | 凌阳科技股份有限公司 | Device and method for homing moving block in optical driver |
-
2003
- 2003-09-23 CN CN 03159704 patent/CN1601621A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101645288B (en) * | 2009-09-08 | 2012-01-04 | 凌阳科技股份有限公司 | Device and method for homing moving block in optical driver |
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