CN1278315C - Track locking method for CD-ROM drive and optical read-write head of CD-ROM drive - Google Patents
Track locking method for CD-ROM drive and optical read-write head of CD-ROM drive Download PDFInfo
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- CN1278315C CN1278315C CN 200410001196 CN200410001196A CN1278315C CN 1278315 C CN1278315 C CN 1278315C CN 200410001196 CN200410001196 CN 200410001196 CN 200410001196 A CN200410001196 A CN 200410001196A CN 1278315 C CN1278315 C CN 1278315C
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- write head
- optical read
- tracks
- frequency
- rom drive
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000009471 action Effects 0.000 claims description 35
- 230000009191 jumping Effects 0.000 claims description 30
- 238000013016 damping Methods 0.000 claims description 17
- 238000010586 diagram Methods 0.000 description 5
- 230000033001 locomotion Effects 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
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- 238000012545 processing Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000015654 memory Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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- 238000012360 testing method Methods 0.000 description 1
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Abstract
The present invention relates to a track locking method for a CD-ROM drive and an optical read-write head of the CD-ROM drive, which can avoid the deviation phenomenon of the optical read-write head. After the CD-ROM drive finishes the track seeking operation, if the relative speed of the optical read-write head and an optical disc is not just in the condition that the track locking operation can be executed, deflecting force or braking force is provided for an optical lens of an actuator in advance to serve as the initial state of the subsequent track locking operation.
Description
Technical field
The present invention relates to the track locking method of the optical read/write head of a kind of CD-ROM drive and CD-ROM drive, be particularly related to a kind of reference detected frequency signal of jumping onto the tracks of optical read/write head at that time, before the action of lock rail, control the optical lens of actuator (actuator), so that the laser of optical read/write head (pickup head) can be followed the data-track of (follow) discs effectively in advance.
Background technology
Ask for an interview Fig. 1, Fig. 1 is a traditional CD-ROM system, discs 10 is driven by Spindle Motor (spindlemotor) 12 and rotates, haulage gear (sled mechanism) 14 drive optical read/write heads (pickuphead, PUH) 16, actuator 18 is arranged on the PUH 16, actuator 18 is provided with optical lens 20, in order to laser focusing on discs 10, and central processing unit (central processing unit, CPU) 22 coordinations of being responsible between all components.
Have actuator (actuator) track 24 in the discs 10, utilize the relative position that optical read/write head 16 is moved to purpose track 24a, the data read of purpose track 24a is come out.And optical read/write head 16 moves to the action of purpose track 24a from current track, is called to seek rail action (track seeking), drives optical read/write heads 16 by haulage gear 14 and finishes.But; because the heterogeneity of discs 10 and stick up phenomenon in the wrong; eccentric phenomena is a little arranged when adding discs 10 rotations; so; when Spindle Motor 12 drove discs 10 rotations, overall optical disc 10 usually can periodicity and among a small circle radial (radial) vibrations and axially (axial) vibrations.Radial vibrations can cause the problem of jumping onto the tracks, and can cause that axially optical read/write head institute emitted laser focuses on wrong problem.In order to make laser focus point can follow purpose track 24a closely, institute is so that need carry out what is called lock rail action (tracking).
The action of lock rail is a kind of micro-adjusting mechanism in reading by control, just actuator (actuator) 18.Briefly, control the position of optical lens 20 in the fine actuator 18 exactly, wish to make the relative motion of the data-track of focus point behind the laser penetration lens and discs to equal zero.So, optical lens in the actuator 18 20 be exactly design come can be slightly but high frequency ground is radial and axial cyclic moves.General actuator 18 is with the radial of electromagnetic mode control optical lens 20 and moves axially that radial control signal can be described as lock rail (track) signal, and axially movable control signal can be described as focusing (focus) signal, shown on Fig. 1.
Before carrying out the action of lock rail as yet, CD-ROM drive can be known the generation of the incident of jumping onto the tracks, and learns by optical read/write head detected a frequency (per second has been jumped several rails) of jumping onto the tracks.For convenience, in this definition: the frequency of jumping onto the tracks is timing, and the expression laser focus point width of cloth is peripheral mobile towards discs 10 to ground; When the frequency of jumping onto the tracks was negative, the expression laser focus point width of cloth moved towards discs 10 centers of circle to ground.Because the vibrations of discs 10 are periodic, the frequency of jumping onto the tracks also can periodic positive and negative change, as shown in Figure 2.When the frequency of jumping onto the tracks by just changeing negative, or when turning negative number to positive number, represent that just seeking signal is later.
When the absolute value of the frequency of jumping onto the tracks is too big, mean that laser focus point is very big to the relative moving speed of discs, the action of lock rail also has no way of carrying out.Have only when laser focus point little in certain limit the time to the relative moving speed of discs, or the absolute value of the frequency of jumping onto the tracks just can be locked the rail action during less than certain value.Behind the lock rail, actuator 18 just can accept to lock the control of rail signal and focusing signal, makes wherein optical lens 20 do radial and move axially, so that laser focus point is followed purpose track 24a.In Fig. 2, just can carry out the action of lock rail in a time and c time, but just not all right in b and d time.
At present, before locking the rail action, all be actuator 18 not to be carried out any control.In other words, before locking the rail action, lock rail signal and focusing signal all are zero, mean that the optical lens 20 of actuator 18 is positioned under the state that does not stress.Yet, in the laboratory, often find that after the action of lock rail, being used for controlling radial mobile lock rail signal is not average changing between positive negative value, but as Fig. 3 a, general full deflection on the occasion of, or as Fig. 3 b, general full deflection negative value.This means that optical read/write head 16 is not the top, middle that is in the purpose track, and some skews are arranged, so that mostly being in stress, the optical lens 20 of actuator 18 remedies this skew, this phenomenon is called inclined to one side head (runout) phenomenon, can be respectively interior (inward) partially and outer (outward) the two kinds of situations partially of being divided into haply.In case CD-ROM drive is subjected to accidental vibrations, this inclined to one side phenomenon is easy to make purpose track 24a to break away from the scope that actuator 18 can be followed, and makes the reading of data process interrupt, and must seek rail and lock rail again.
According to the method for conventional art, a so inclined to one side phenomenon, can lock the rail signal by identification after, control haulage gear 14 revised.Yet this corrective action needs extra logic control, will cause the uncertainty of extra burden of system and signal.
Summary of the invention
In view of this, the invention provides the track locking method of the optical read/write head of a kind of CD-ROM drive and CD-ROM drive, to avoid CD ROM reading-writing head that inclined to one side phenomenon takes place, at first make read/write head move to a precalculated position, then when read/write head is positioned at the precalculated position, detect the frequency of jumping onto the tracks, then, confirm to jump onto the tracks the standard that whether frequency meets is enough to lock the rail action.
When if frequency is jumped onto the tracks in identification for the first time, the frequency of jumping onto the tracks has just met lock rail standard, then carries out this lock rail action at once, so that laser focus point is followed the purpose track on the discs.
When if frequency is jumped onto the tracks in identification for the first time, the frequency of jumping onto the tracks does not also meet lock rail standard, then provide a damping force to give the optical lens of actuator, and continue to distinguish whether the frequency of jumping onto the tracks meets lock rail standard, after waiting until that always the frequency of jumping onto the tracks meets lock rail standard, just in damping force as under the initial state, carry out the action of lock rail.
Description of drawings
For above-mentioned purpose of the present invention, feature or advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described below in detail:
Fig. 1 is the block schematic diagram of a traditional CD-ROM system;
Fig. 2 seeks jump onto the tracks in the rail process frequency and time relation figure for being presented at;
Fig. 3 a and Fig. 3 b show respectively when the optical lens of actuator produces outer (outward) partially and interior (inward) phenomenon partially, the variation synoptic diagram of lock rail signal;
Fig. 4 is the block schematic diagram of a CD-ROM system of enforcement the inventive method;
Fig. 5 is the track locking method process flow diagram of optical read/write head of the present invention;
Fig. 6 is after implementing optical read/write head track locking method of the present invention, the variation of lock rail signal.
Description of symbols:
Embodiment
The present invention is a kind of track locking method of optical read/write head of CD-ROM drive, after CD-ROM drive is being sought the rail action, if the relative velocity of optical read/write head and discs, not when just being in the condition that to carry out the action of lock rail, provide a biasing force or a damping force optical lens, as the initial state of follow-up lock rail action to actuator in advance.So, the similar idea of skew (offset) in advance, just can make the lock rail after, optical read/write head is in the middle top of purpose track, lock rail signal also can near balanced shaking zero point.
Fig. 4 is a utilization CD-ROM system of the present invention, discs 10 is driven by Spindle Motor 12 and rotates, haulage gear 14 drives optical read/write head 16 and does the width of cloth to moving, actuator 18 is arranged on the PUH 16, be equiped with optical lens 20 on the actuator 18, actuator 18 utilize solenoid make optical lens 20 do the width of cloth to move axially.Central processing unit (CPU) 22 is responsible for the coordination between all components, and internal memory 32 stores and provide the action that CPU 22 will carry out or the program code of computing.A preferred embodiment of the present invention, the optical read/write head track locking method is the form with program code, is stored among the internal memory 32.
See also Fig. 5, Fig. 5 is a method flow diagram of the present invention.
Step 60:, calculate purpose track 24a according to user's demand.
Step 62: control haulage gear 14 makes optical read/write head 16 move to the top of purpose track 24a generally. Step 60 and 62 can be referred to as seeks rail action (track seeking).At this moment, Spindle Motor 12 is under CPU 22 control and rotate.Because of various reasons, the eccentric phenomena of discs 10 for example, the center of circle of discs 10 and optical read/write head 16 can produce relative motions, and the phenomenon of may jumping onto the tracks.
Step 64: whether the state of checking discs can directly lock the rail action.This can reach by the inspection frequency of jumping onto the tracks.If the absolute value of the frequency of jumping onto the tracks is enough low, for example less than 3000 rail/seconds, the expression discs is very little to optical read/write head 16 speed of related movements, just can directly enter step 70; The absolute value of frequency is excessive if jump onto the tracks, and for example greater than 3000 rail/seconds, the expression discs is very big to optical read/write head 16 speed of related movements, can not lock rail, enters step 66.In a preferred embodiment of the present invention, utilize the absolute value of the frequency of jumping onto the tracks to be used as checking the condition that whether can lock rail less than certain certain value, the setting of this certain value is not to be a fixed value, must look the actual design of CD-ROM system and sets.
Step 66: actuator 18 applies a biasing force or a damping force to optical lens 20, so that optical lens 20 can be offset in advance.The direction of skew can be different along with the positive and negative difference of the frequency of jumping onto the tracks.For example: if in the prior art, the discovery frequency of jumping onto the tracks is just (optical read/write head 16 is towards taking exercises away from the direction in discs 10 axle center), later lock rail action all can cause outer (outward) situation partially of the optical lens 20 of actuator 18, so when this step, just should be by input one lock rail signal to actuator 18, drive optical lens 20 by actuator 18, make optical lens 20 inclined to one side in can going ahead of the rest.Vice versa.If in the prior art, discovery is jumped onto the tracks frequency for bearing (optical read/write head 16 is towards taking exercises near the direction in discs 10 axle center), later lock rail action all can cause interior (inward) situation partially of the optical lens 20 of actuator 18, so when this step, just should be by input one lock rail signal to actuator 18, make in advance outer polarisations of actuator 18 lens 20, can be considered and apply a damping force to optical lens 20.Size as for this damping force can be selected according to the actual design of result of experiment or CD-ROM system.
Step 68: continue to check whether the state of discs can lock rail.Whether in other words, seek discs exactly turns one's head.The similar step 64 of step 68, different is, only meet the state of locking rail bar spare after, just break away from step 68, enter step 70; If after carrying out this step 68, the relative velocity absolute value of 16 pairs of discs 10 of optical read/write head is still excessive, then continue to carry out the test of lock rail bar spare, stride after the rail frequency meets lock rail bar spare up to meeting, just enter step 70.Among the process of execution in step 68, the damping force that is applied when implementation step 66 continuingly acts on the optical lens 20.
Step 70: lock the rail action, store the controlled variable of optical read/write head 16, and export suitable lock rail signal, so that the laser focus point that optical read/write head 16 is sent is followed this purpose track.What need pay special attention to is, can provide different initial state to step 70 from step 68 and step 64, particularly locks the rail signal.When advancing to step 70 by step 64, the value of lock rail signal is 0; When advancing to step 70 by step 64, the value of lock rail signal then is not 0, but the damping force that corresponding step 66 provided.
See also Fig. 2, suppose after following rail action, it is enough little that CD-ROM drive just detects the frequency of jumping onto the tracks, and CD-ROM drive falls within the interval of a or c, and so, CD-ROM drive just under lock rail signal is 0 initial state, is directly locked the rail action.
If, seek rail action after, CD-ROM drive detects the interval that the frequency of jumping onto the tracks falls within b, then will lock the rail signal at once and be preset to first definite value, gives optical lens one damping force of actuator.By the time after CD-ROM drive enters the c interval, be the initial state of first definite value of corresponding damping force, lock the rail action at lock rail signal.
If, seek rail action after, CD-ROM drive detects the interval that oneself falls within d, then will lock at once the rail signal be preset to second definite value (should with first definite value positive and negative on the contrary), give optical lens one damping force of actuator.By the time after CD-ROM drive enters a interval, be the initial state of second definite value of corresponding damping force, lock the rail action at lock rail signal.
As shown in Figure 2, in fact, after seeking the rail action, the state that the CD-ROM drive maximum possible drops on all is the interval (as the interval of d and b) that can not directly lock rail, also be in the prior art, the outer inclined to one side or reason of interior inclined to one side phenomenon of the optical lens of the most normal generation actuator.So the present invention we can say inclined to one side problem of the optical lens that has solved actuator significantly.
Fig. 6 controls radial mobile lock rail signal and just changes between positive negative value fifty-fifty after showing utilization method of the present invention, does not have inclined to one side the phenomenon that takes place in the prior art.
The present invention as the initial state of lock rail action, just can prevent the outer inclined to one side or interior inclined to one side situation of recurrent optical lens in the prior art by a default damping force.In prior art, need complicated logic control circuit, after hair is given birth to partially, just remedy or correct inclined to one side head, as seen, prevention method of the present invention both can be described as and achieved the goal, again cost of idleness not.
Though the present invention with a preferred embodiment openly as above; right its is not in order to limiting the present invention, anyly is familiar with those of ordinary skills, without departing from the spirit and scope of the present invention; change and modification when making, so protection scope of the present invention is as the criterion with claim.
Claims (4)
1. the track locking method of an optical read/write head is characterized in that, this track locking method comprises at least:
When this optical read/write head is positioned at a precalculated position, detect the frequency of jumping onto the tracks of this optical read/write head;
Distinguish whether this frequency of jumping onto the tracks meets a lock rail standard;
When this frequency of jumping onto the tracks does not meet this lock rail standard, the optical lens of a damping force to this actuator is provided, revise inclined to one side phenomenon of this optical lens; And
When this frequency of jumping onto the tracks meets this lock rail standard, to carry out the action of lock rail corresponding to the lock rail signal of this damping force.
2. track locking method as claimed in claim 1 is characterized in that, this lock rail standard for the absolute value of this frequency of jumping onto the tracks less than a definite value.
3. track locking method as claimed in claim 1 is characterized in that, this lock rail standard for the absolute value of this frequency of jumping onto the tracks less than 3000 rail/seconds.
4. track locking method as claimed in claim 1 is characterized in that, when optical read/write head when taking exercises away from the direction in disc axle center, this damping force is one first definite value; When optical read/write head when taking exercises near the direction in discs axle center, this damping force is one second definite value, and this first definite value is opposite with the action direction of this second definite value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001196 CN1278315C (en) | 2004-02-04 | 2004-02-04 | Track locking method for CD-ROM drive and optical read-write head of CD-ROM drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410001196 CN1278315C (en) | 2004-02-04 | 2004-02-04 | Track locking method for CD-ROM drive and optical read-write head of CD-ROM drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558404A CN1558404A (en) | 2004-12-29 |
| CN1278315C true CN1278315C (en) | 2006-10-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410001196 Expired - Fee Related CN1278315C (en) | 2004-02-04 | 2004-02-04 | Track locking method for CD-ROM drive and optical read-write head of CD-ROM drive |
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| Country | Link |
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| CN (1) | CN1278315C (en) |
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- 2004-02-04 CN CN 200410001196 patent/CN1278315C/en not_active Expired - Fee Related
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| CN1558404A (en) | 2004-12-29 |
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Owner name: YUTIAN STOCK CO., LTD. Free format text: FORMER OWNER: WEISHENG ELECTRONICS CO., LTD. Effective date: 20080125 |
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Effective date of registration: 20080125 Address after: Delaware Patentee after: VIA Technologies, Inc. Address before: Taipei County of Taiwan Province Patentee before: VIA TECHNOLOGIES, Inc. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20061004 |