CN1292416C - Method of real time controlling motor voltage of sheave pully when jumping rail - Google Patents
Method of real time controlling motor voltage of sheave pully when jumping rail Download PDFInfo
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- CN1292416C CN1292416C CN 03159703 CN03159703A CN1292416C CN 1292416 C CN1292416 C CN 1292416C CN 03159703 CN03159703 CN 03159703 CN 03159703 A CN03159703 A CN 03159703A CN 1292416 C CN1292416 C CN 1292416C
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- coaster
- write head
- optical read
- tracks
- motor voltage
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Abstract
The present invention relates to a method of controlling the motor voltage of a sheave pulley at the time of jumping a rail in real time. Firstly, a certain motor voltage of the sheave pulley is provided for making the sheave pulley to slide, and grating signals are monitored. When the grating signals have a waveform with the predetermined frequency, the motor voltage of the sheave pulley is cut off. The position of an optical read-write head is trimmed so that the optical read-write head can move in a central position after jumping the rail.
Description
Technical field
The present invention is the method for control coaster motor voltage in real time when jumping onto the tracks in a kind of CD drive.And particularly provide a kind of method the feasible center of back optical read/write head of jumping onto the tracks at its mobile range.
Background technology
General CD drive receive that main frame (host) sends read (or writing) order the time, the operation that its rail searching servo system (seeking servo) can seek rail (seeking) earlier, also soon optical read/write head moves on the target rail (target track) of servo-drive system indication.Usually jumping onto the tracks is divided into long jumping onto the tracks (the thick jumping) and short jumping onto the tracks (the thin jumping), and the distance of hundreds of rail all is considered as short jumping onto the tracks, and the above distance of several thousand rails is then looked long jump onto the tracks.To jump 10000 rails is example, and the rail searching servo system can jump 9500 rail (promptly long jumping onto the tracks) earlier, and then utilizes short mechanism of jumping onto the tracks to come accurate control optical read/write head to arrive the target rail.Because of the present invention only involves short jumping onto the tracks, following mechanism explanation all is to jump onto the tracks at short.
Please refer to Fig. 1, it is the schematic diagram of optical head module.Optical head module 1 comprises mechanisms such as optical read/write head 3, spring 5 and coaster 7 and laser diode (not shown).When not far, (for example have only 100 rails at the target gauge with the distance of optical read/write head 3; Promptly lack and jump onto the tracks), servo-drive system only can be carried out slight position adjustment to optical read/write head 3.This position adjustment promptly is to be finished by spring 5.Spring 5 is followed acting force that track servo system gives, and mobile optical read/write head 3 is as shown in Figure 1 slightly.Servo-drive system detects target rail position, and then acting force is added to spring 5 and makes its pulling optical read/write head 3 arrival target rails.
After jumping onto the tracks, the position of optical read/write head 3 can be adjusted at the center of coaster 7 usually shown in Fig. 2 (a).Because of the operation of promptly locking rail (track on) after jumping onto the tracks.If the position of optical read/write head 3 is far away apart from the center of coaster 7, the time of then required lock rail just more for a long time.Severe patient even lock rail failure cause servo-drive system can't judge the position of optical read/write head 3 (so time optical read/write head 3 outside supratrochlear mobile range).So servo-drive system can be utilized a coaster motor voltage (sled motor control signal:FMO) movable block 7 when weak point is jumped onto the tracks and followed rail usually, makes optical read/write head 3 remain in its mobile range.
The coaster motor voltage be movable block 7 apply acting force voltage, by the mobile change optical read/write head 3 of coaster 7 and the relative position of coaster 7, make the position of optical read/write head 3 in mobile range.How below will describe the coaster motor voltage in detail adjusts the position of optical read/write head and makes it not exceed mobile range.
Please refer to Fig. 2 (a), optical read/write head 3 is in the center of coaster 7 at this moment.When optical read/write head 3 is lacked when jumping onto the tracks, the servo-drive system acting force is added to spring 5 and optical read/write head 3 is moved toward directions 11 jump onto the tracks.Stressed because of optical read/write head 3, so also beginning acting force, the coaster motor voltage is added to coaster 7 shown in Fig. 2 (b).Yet this moment, the acting force of coaster motor voltage was not sufficient to movable block (weight of coaster and the relation of friction force).Optical read/write head 3 continues to jump onto the tracks toward direction 11, and the position of optical read/write head 3 also more is offset the center of coaster 7 shown in Fig. 2 (c).This moment, optical read/write head 3 surpassed its mobile range soon, and the acting force of coaster motor voltage be also greatly to promoting coaster 7, so coaster 7 stressed past directions 11 slips, optical read/write head 3 is got back to the center of coaster 7 again shown in Fig. 3 (d).Then repeat above-mentioned mechanism mobile optical read/write head 3 if continue again to jump onto the tracks.
Yet, when jumping onto the tracks,, make that its position was not in supratrochlear mobile range when optical read/write head arrived the target rail usually because of the difference of kinetic force of friction and stiction.
Please refer to Fig. 3 (a), optical read/write head 3 is in the center of coaster 7 at this moment.Because of jumping onto the tracks (is example with 200 rails), so optical read/write head 3 moves toward direction 11.The power curve of coaster motor voltage is shown in Fig. 3 (d).After optical read/write head moved 100 rails, during the fast mobile range that breaks away from the coasters 7 of optical read/write head 3 (shown in Fig. 3 (b)), the coaster motor voltage was applied to coaster 7 one acting forces, and coaster 7 is slided toward directions 11.Yet,, make optical read/write head 3 still not in the center of coaster 7 so coaster 7 slips over head because the stiction of coaster 7 is greater than its kinetic force of friction.Severe patient optical read/write head 3 even exceed its mobile range (shown in Fig. 3 (c)).
The lock rail operation that above-mentioned situation is carried out for the back of jumping onto the tracks is very unfavorable.Often will spend the more time locks rail or causes locking rail failure.So need a kind of method of more effective control coaster motor voltage when conventional as can be known CD drive weak point is jumped onto the tracks, the position of the feasible back optical read/write head of jumping onto the tracks is in the center of coaster.
Summary of the invention
The method of control coaster motor voltage in real time when the purpose of this invention is to provide a kind of CD drive and jumping onto the tracks.Solve the not problem in its mobile range of back optical read/write head of jumping onto the tracks with this.
When proposing to jump onto the tracks in a kind of CD drive, the present invention controls the method for coaster motor voltage in real time.It is summarized as follows: provide a definite value coaster motor voltage that is used to drive coaster that one coaster is slided, and monitor a grating signal that produces based on circular grating.When waveform by the number of times of the length decision of jumping onto the tracks appears in grating signal, promptly turn-off the coaster motor voltage.Finely tune the position of optical read/write head again, the feasible center of back optical read/write head of jumping onto the tracks at mobile range.
In order 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 the schematic diagram of optical head module;
Fig. 2 when jumping onto the tracks, the synoptic diagram of optical read/write head and coaster relative position;
When Fig. 3 jumps onto the tracks for conventional CD drive, the synoptic diagram of optical read/write head and coaster relative position;
Fig. 4 is circular grating and grating signal synoptic diagram;
Fig. 5 is coaster motor voltage of the present invention and grating signal synoptic diagram; And
When Fig. 6 jumps onto the tracks for the present invention, the synoptic diagram of coaster and optical read/write head relative position.
Label declaration
1 optical head module, 17 circular grating printing opacity places
The light tight place of 3 optical read/write heads, 19 circular gratings
5 springs 21 direction of jumping onto the tracks
7 coasters, 23 coaster working direction
The 11 direction 25 coaster motor voltages of jumping onto the tracks
13 circular grating 27 grating signals
15 circular grating sense of rotation
Embodiment
In general, CD drive utilizes the coaster motor voltage to come the movable block position to make optical read/write head in its mobile range short when jumping onto the tracks.It is right because stiction that coaster is suffered and kinetic force of friction differ the too big feasible back optical read/write head of jumping onto the tracks not in its mobile range.In order to overcome the problems referred to above, the present invention proposes a method of control coaster motor voltage in real time when jumping onto the tracks.
The present invention utilizes a grating signal (photo signal) to come the auxiliary method of finishing real-time control coaster motor voltage.The generation of following first brief introduction grating signal and the physical significance of representative thereof.
Please refer to Fig. 4, it is a circular grating.When CD drive started, this circular grating 13 can be toward direction 15 rotations.Grating signal has a waveform generation when the laser of returning by CD reflection passes through the printing opacity place 17 of this circular grating 13; If instead then do not have any waveform generation during the light tight place 19 by circular grating 13.Because of the rotational speed of this circle grating is fixed, 50 rails have just in time been jumped as shown in Figure 4 so work as coaster interval time of each waveform generation of grating signal.Generally be used for calculating several rail error signals (tracking error signal) of seeking of jumping onto the tracks, just represent optical read/write head to jump 1 rail through the cycle of a waveform.Represent coaster to jump 50 rails with the cycle of a waveform of grating signal very big difference is arranged.The number of jumping onto the tracks when so the normal light gate signal can be used for calculating long jumping onto the tracks, but weak point then is to calculate the number of jumping onto the tracks with seeking the rail error signal when jumping onto the tracks.
The present invention promptly is the reference light gate signal, the coaster motor voltage when control adjustment is jumped onto the tracks in real time.Please refer to Fig. 5, it is expression the present invention controls the coaster motor voltage in real time when short jumping onto the tracks a synoptic diagram.Suppose that servo-drive system sends the order of jumping 200 rails,,, make the coaster slip so make coaster motor voltage 25 be certain value (as Fig. 5 (shown in the b)) because on behalf of coaster, the one-period of grating signal waveform 27 passed through 50 rails.Monitor grating signal 27 this moment, when the waveform in 3 cycles appears in grating signal 27, coaster motor voltage 25 is turn-offed at once.Coaster 7 speed can slack-offly gradually stop at last.This moment calculating optical read/write head 3 distance objective rails track number, and then utilize optical read/write head mobilely finish the remaining track number of not finishing, make optical read/write head 3 just in time be positioned at the center of coaster 7 when arriving the target rails.
Why when 3 cycles only appear in last routine grating signal, just coaster motor 25 is turned off? that is because coaster 7 begins to slide in time that 4 cycles turn off again appears in grating signal 27, coaster 7 has moved 200 rails, even if mobile optical read/write head 3 also is difficult for making it to place the center of coaster 7 thus.So when usually 3 cycles appear in grating (coaster slided 150 rails), the remaining track number of not covering then utilizes fine setting optical read/write head 3 to make it arrive the target rail.
Please refer to Fig. 6, the optical head module diagram when it jumps 200 rails for the present invention.When servo-drive system send jump the order of 200 rails toward direction 21 at the beginning of, 3 of optical read/write heads are in the center of coaster 7, shown in Fig. 6 (a).Servo-drive system impels coaster 7 to slide toward direction 23 directly for coaster motor voltage one bias value, thus the center that this moment, optical read/write head 3 can more and more depart from coaster 7 because of the relation of inertia, shown in Fig. 6 (b).Observe the grating signal appearance during three cycles (coaster has been walked 150 rails), the coaster motor voltage is switched off at once, so coaster 7 is not subjected to any acting force.Coaster 7 speed can slack-offly gradually stop at last.Being adjusted by spring 5 more afterwards makes optical read/write head 3 finish remaining track number.Thus, when optical read/write head 3 was finished jumping onto the tracks of 200 rails, its position was just in time in the center of coaster 7.
Therefore, advantage of the present invention is to be to utilize existing hardware device, can reach in the correction of back position of optical read write head of jumping onto the tracks.Effectively improve conventional jump onto the tracks the back because of kinetic force of friction and stiction differ cause too much jump onto the tracks after the optical read/write head problem in its mobile range not.
Another advantage of the present invention is effectively to improve the time that the lock rail is operated required cost.Make coaster move the most number (coarse adjustment) of jumping onto the tracks because of the present invention at first controls the coaster motor voltage, utilize spring to go to finely tune the position of optical read/write head again.It is more accurate to utilize the spring fine tuning that optical read/write head is lacked when jumping onto the tracks as compared with the past.Make optical read/write head promptly be positioned at the center of coaster having jumped onto the tracks, be very beneficial for ensuing lock rail operation, effectively shorten lock rail required time.
Certainly the present invention does not limit to and can only be applied to short jumping onto the tracks because original when jumping onto the tracks basically be exactly long jump onto the tracks and short jumping onto the tracks used with, long again jumping onto the tracks and the firmware identification of short definition of jumping onto the tracks by servo-drive system.So foregoing invention is not limited to jump the application of jumping onto the tracks of the weak point of hundreds of rail.
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 (8)
1. the coaster motor voltage method of control in real time when jumping onto the tracks in the CD drive includes the following step:
Provide a definite value coaster motor voltage that is used to drive coaster that one coaster is slided, and monitor a grating signal that produces based on circular grating;
When this grating signal occurs one during by the waveform of the number of times of the length decision of jumping onto the tracks, turn-off this coaster motor voltage, and calculate the distance of an optical read/write head from a target rail; And
Move this optical read/write head and arrive this target rail, make this optical read/write head in a precalculated position.
2. the method for claim 1, wherein the waveform of this grating signal occurs once representing coaster to move a plurality of fixing track numbers.
3. the method for claim 1, wherein this precalculated position promptly is the middle position of this optical read/write head mobile range on this coaster.
4. the method for claim 1, wherein this coaster motor voltage applies acting force voltage for this coaster.
5. the method for claim 1, wherein this method also comprises:
Calculate a track number of optical read/write head distance one target rail; With
Determine a grating signal waveform of a pre-determined number should occur according to this track number.
6. method as claimed in claim 5, wherein the waveform of this grating signal occurs once representing coaster to move a plurality of fixing track numbers.
7. method as claimed in claim 5, wherein this precalculated position promptly is the middle position of this optical read/write head mobile range on this coaster.
8. method as claimed in claim 5, wherein this coaster motor voltage applies acting force voltage for this coaster.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159703 CN1292416C (en) | 2003-09-23 | 2003-09-23 | Method of real time controlling motor voltage of sheave pully when jumping rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159703 CN1292416C (en) | 2003-09-23 | 2003-09-23 | Method of real time controlling motor voltage of sheave pully when jumping rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1601619A CN1601619A (en) | 2005-03-30 |
| CN1292416C true CN1292416C (en) | 2006-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03159703 Expired - Fee Related CN1292416C (en) | 2003-09-23 | 2003-09-23 | Method of real time controlling motor voltage of sheave pully when jumping rail |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1292416C (en) |
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2003
- 2003-09-23 CN CN 03159703 patent/CN1292416C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1601619A (en) | 2005-03-30 |
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