CN102930876B - Optical disc apparatus and shaven head jump control method and device thereof - Google Patents
Optical disc apparatus and shaven head jump control method and device thereof Download PDFInfo
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Abstract
A kind of optical disc apparatus and shaven head jump control method thereof and device, described shaven head jump control method includes: drive CD with fixing linear velocity；After receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；Jump; when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to jump to the protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region；Repeat the above steps is until jumping successfully.The technical program simplifies the structure of optical disc apparatus when saving Hall element and controlling loop, reduce cost, and can prevent shaven head from flying out outside CD, solve because in jump process, shaven head flies out data of optical disk region and the jump failure that causes, it is ensured that jump successfully.
Description
Technical field
The present invention relates to disc drives field, particularly to a kind of optical disc apparatus and shaven head jump control method thereof and device.
Background technology
CD storage technique is the new and high technology starting the beginning of the seventies to grow up.Optical disc storage have memory density height, capacity big, can random access memory, preserve life-span length, other record unrivaled advantages of media a series of such as portable stable and reliable in work, light, be particularly suitable for storage and the exchange of big data quantity information.CD storage technique can not only meet the needs of informationized society ultrahigh-density data storage, and can store the information of the medias such as sound, word, figure, image, so that traditional information storage, transmission, management and occupation mode there occurs the change of essence simultaneously.
On CD, the data of storage are read by optical disc apparatus (being commonly referred to CD-ROM drive).Fig. 1 is the structural representation of optical disc apparatus in prior art.As it is shown in figure 1, described optical disc apparatus includes: detection records the light picker (PU, PickUp) 11 of signal on the optical disc 10, and light picker 11 is specially laser beam modulation head assembly, it is commonly abbreviated as shaven head 11；Spindle motor (SPDL, SpindleMotor) 12 with high speed rotating CD 10；By the stepper motor 13 moving radially shaven head 11 of CD 10；The motor driving chip 14 of drive shaft motor 12 and stepper motor 13 work；Master chip 15 with the whole operation controlling optical disc apparatus.
Spindle motor 12 has frequency generator (FG, FrequencyGenerator) sensor 121 (being also called Hall element), it produces train of pulse (being commonly referred to as FG signal) during spindle motor 12 rotates, and uses the operating controlling spindle motor 12.Therefore, functionally, FG sensor 121 here can be described as again the rotation speed monitoring device of spindle motor 14.This rotation speed monitoring device is a Magnetosensing element, its characteristic is exactly particularly that the more big voltage of magnetic field intensity is more big, vice versa, so for a Magnetosensing element, its voltage is in sine wave change, because spindle motor 12 magnetic field intensity of its internal certain point when rotating is in periodically variable.Although this Magnetosensing element is inside spindle motor 12, but its voltage change signal (FG signal) can send master chip 15 to by measure loop.One rotating speed determining program can be set inside master chip 15, it is through the voltage change signal (FG signal) that Magnetosensing element monitors in simple terms and judges its cycle size, and then judge the rotating speed size (the rotating speed size of CD) of spindle motor 12.
The spindle motor installing Hall element is generally without (electricity) brush motor, and brush motors then and is not provided with Hall element.Brushless motor, its operation principle is essentially identical with brush motors, is all carry out pushing motor by change alternating magnetic field to rotate.The difference is that brush motors be realize the brushless motor of machinery commutation by the contact of brush and commutator then to require over special driving chip and go to realize electronics commutation.Brushless motor to realize electronics commutation, it is necessary to can accurately detect the phase place of rotor.Detection phase place mainly has two kinds of methods, and one is Hall element method, and another kind is reverse electromotive force method.Owing to reverse electromotive force method only has superiority under high rotating speed and constant rotational speed state, so, what detect phase place use in the spindle motor field of the movements such as CD/DVD is nearly all Hall element method.Therefore, this kind of brushless motor is otherwise known as Hall motor.
But, have employed the spindle motor of FG sensor relatively costly, and along with spindle motor size becomes more and more less, FG sensor be installed and also become more and more difficult.But without the FG signal that FG sensor sends, it is difficult to again monitor in real time the rotating speed of spindle motor.If additionally, FG sensor is damaged, the rotating speed also resulting in spindle motor cannot be monitored.
When reading the data of CD, the rotary speed of CD needs to control, if rotating speed is too fast, the shaven head being likely to result in reading signal can fly out outside data of optical disk region, time particularly in jump (Search, namely shaven head moves to assigned I D), such as to jump to the position of CD outer ring, close to data end, easily fly out data of optical disk region, causes jumping unsuccessfully, and even (fly out CD) damages shaven head.Fig. 2 is the shaven head jump schematic diagram of optical disc apparatus, in conjunction with Fig. 1 and Fig. 2, the data storage method of CD 10 deposits data with continuous print spiral path, point a is the start position (00:00:00) of CD 10, point b is the final position (readout of CD 10, i.e. data end), shaven head 11 moves horizontally along radius along with CD 10 rotates, read the data on spiral path, from inside to outside or from outside to inside can, can certainly assign instruction allows shaven head 11 directly a bit jump to another point from track, here it is jump (Search).In jump process, if CD 10 rotates too fast, shaven head 11 has quickly been arrived the start position (some a) of track or final position (some b), and will fly out data of optical disk region.
Owing to brushless motor is provided with FG sensor, the rotating speed of CD can be monitored in real time, the rotating speed of spindle motor can be optionally changed according to the rotating speed of the CD monitored, such as to monitor rotating speed very fast, when may result in jumping, shaven head 11 will fly out outside data of optical disk region, then master chip 15 reduces rotating speed by controlling motor driving chip 14 drive shaft motor 12, or master chip 15 sets the amount of movement of shaven head 11 according to currently detected rotary speed, drive stepper motor 13 to realize shaven head 11 by control motor driving chip 14 to move in right amount, thus preventing shaven head 11 from flying out data of optical disk region.But, when using the brush motors of low cost, owing to CD speed cannot be monitored in real time, so needing to take measures to solve shaven head 11 to fly out data of optical disk region and the jump failure that causes.
Application number be 200580014502.9 Chinese patent application disclose the equipment controlling to jump of a kind of head range, but the problems referred to above are not directed to.
Summary of the invention
The problem that this invention address that is to provide a kind of optical disc apparatus and shaven head jump control method thereof and device, reduce the cost of optical disc apparatus, and solve because in jump process, shaven head flies out data of optical disk region and the jump failure that causes, it is ensured that jump successfully.
For solving the problems referred to above, the present invention provides the shaven head jump control method of a kind of optical disc apparatus, including:
CD is driven with fixing linear velocity；
After receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；
Jump; when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region；
Repeat the above steps is until jumping successfully.
Optionally, described judge whether shaven head will jump to deathtrap and include based on current linear velocity:
The track number of movement needed for calculating from current location to target location based on current linear velocity；
The start position from current location to CD or the track number of movement needed for final position is calculated based on safety line velometer；
If described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position, it is determined that shaven head will jump to deathtrap.
Optionally, after receiving skip instruction, before judging whether shaven head will jump to deathtrap based on current linear velocity, also include judging whether current linear velocity is described safety line speed, it is be made directly jump, otherwise judges whether shaven head will jump to deathtrap based on current linear velocity.
Optionally, described shaven head jump control method also includes arranging dangerous alarming sign, when determining that shaven head will jump to deathtrap, described dangerous alarming sign is set on state；The failure and judge that described dangerous alarming sign is in opening if jumping, then reduce current linear velocity, and described dangerous alarming sign be set to off closed state.
Optionally; described shaven head jump control method also includes arranging the linear velocity protection counting that initial value is 0; when judging that described dangerous alarming sign is in opening, then the value of described linear velocity protection counting is added 1, gradually reduce current linear velocity according to the value of described linear velocity protection counting.
Optionally, gradually reduce current linear velocity according to the value of described linear velocity protection counting to include:
The linear velocity of multiple class is set gradually by the size of linear velocity；
Identify the value of described linear velocity protection counting; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduces the linear velocity of a class.
Optionally; the linear velocity of three class is set gradually by the size of linear velocity; respectively First Line speed, the second linear velocity, described safety line speed; first drive CD with described First Line speed; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity, if the value of described linear velocity protection counting is 2, then drive CD with described second linear velocity; if the value of described linear velocity protection counting is 3, then drive CD with described safety line speed.
Optionally, described First Line speed is 1.2m/s, and described second linear velocity is 1.1m/s, and described safety line speed is 1.0m/s.
For solving the problems referred to above, additionally provide a kind of shaven head jump and control device, including:
Driver element, for driving CD with fixing linear velocity；
Judging unit, for, after receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；
Control unit; for when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region.
Optionally, described judging unit includes deathtrap judging unit, and described deathtrap judging unit includes:
First computing unit, for the track number of movement needed for calculating from current location to target location based on current linear velocity；
Second computing unit, for calculating the start position from current location to CD or the track number of movement needed for final position based on safety line velometer；
Determine unit, for when described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position time, it is determined that shaven head will jump to deathtrap.
Optionally, described judging unit also includes present speed judging unit, for after receiving skip instruction, before judging whether shaven head will jump to deathtrap based on current linear velocity, judge whether current linear velocity is described safety line speed, it is be made directly jump, is otherwise judged whether shaven head will jump to deathtrap by described deathtrap judging unit based on current linear velocity.
Optionally, the mark that described judging unit also includes being suitable to arrange dangerous alarming sign arranges unit, when determining that shaven head will jump to deathtrap, described dangerous alarming sign is set on state；The failure and judge that described dangerous alarming sign is in opening if jumping, then reduce current linear velocity, and described dangerous alarming sign be set to off closed state.
Optionally, described control unit includes:
Counting arranges unit, for arranging the linear velocity protection counting that initial value is 0, when described judging unit judges that described dangerous alarming sign is in opening, then adds 1 by the value of described linear velocity protection counting；
Wire velocity control unit, for gradually reducing current linear velocity according to the value of described linear velocity protection counting.
Optionally, described wire velocity control unit gradually reduces current linear velocity include according to the value of described linear velocity protection counting:
The linear velocity of multiple class is set gradually by the size of linear velocity；
Identify the value of described linear velocity protection counting; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduces the linear velocity of a class.
For solving the problems referred to above, additionally provide a kind of optical disc apparatus including above-mentioned shaven head jump control device.
Compared with prior art, the technical program has the advantage that
By adopting fixing linear velocity to drive CD, and after receiving skip instruction, judge whether shaven head will jump to deathtrap based on current linear velocity, when jump failure and judge that shaven head will jump to deathtrap, then reduce current linear velocity and again jump, it is thus possible to while preventing shaven head from flying out outside CD, effectively solve shaven head in jump process and fly out data of optical disk region and the jump failure that causes, it is ensured that jump successfully.
The linear velocity of multiple class is set; first drive CD with linear velocity faster; after receiving skip instruction; by described dangerous alarming sign and linear velocity protection counting; thus convenient, realize neatly to jump to the number of times of deathtrap and gradually reducing the linear velocity that drives CD according to identifying shaven head after unsuccessfully jumping; both can guarantee that and completed within a short period of time to jump, the jump failure caused outside the data of optical disk region that can solve again to fly out in jump process.
Optical disc apparatus have employed brush motors, guaranteeing that shaven head jumps successfully simultaneously, simplifies structure, reduces cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical disc apparatus in prior art；
Fig. 2 is the shaven head jump schematic diagram of optical disc apparatus；
Fig. 3 is the shaven head jump control method schematic flow sheet of the optical disc apparatus that embodiment of the present invention provides；
Fig. 4 is the structural representation of the optical disc apparatus that the embodiment of the present invention provides；
Fig. 5 is an embodiment schematic flow sheet of shaven head jump control method provided by the invention；
Fig. 6 is another embodiment schematic flow sheet of shaven head jump control method provided by the invention；
Fig. 7 is the structural representation that the shaven head jump that embodiment of the present invention provides controls device.
Detailed description of the invention
In prior art, optical disc apparatus generally adopts the brushless motor being provided with FG sensor, but it is relatively costly, and adopt the brush motors of low cost owing to CD speed cannot be monitored in real time, thus being difficult to prevent shaven head from flying out outside CD, it is also difficult to solve shaven head in jump process and fly out data of optical disk region and the jump failure problem that causes.In the technical program, optical disc apparatus adopts brush motors, CD is driven with fixing linear velocity, and after receiving skip instruction, judge whether shaven head will jump to deathtrap based on current linear velocity, when jump failure and judge that shaven head will jump to deathtrap, then reduce current linear velocity, it is thus possible to while preventing shaven head from flying out outside CD, effectively solve shaven head in jump process and fly out data of optical disk region and the jump failure that causes, it is ensured that jump successfully.
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.
Elaborate detail in the following description so that fully understanding the present invention.But the present invention can be different from alternate manner described here implement with multiple, and those skilled in the art can do similar popularization when without prejudice to intension of the present invention.Therefore the present invention is not by the restriction of following public detailed description of the invention.
Fig. 3 is the shaven head jump control method schematic flow sheet of the optical disc apparatus that embodiment of the present invention provides.Consulting Fig. 3, described shaven head jump control method includes:
Step S101, drives CD with fixing linear velocity；
Based on current linear velocity, step S102, after receiving skip instruction, judges whether shaven head will jump to deathtrap, described deathtrap refers to the region beyond data of optical disk region；
Step S103; jump; when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region；
Step S104, repeat the above steps is until jumping successfully.
It should be noted that; in embodiment of the present invention; shaven head is when performing skip operation; region beyond data of optical disk region is defined as deathtrap; described deathtrap had both included a part of protection zone (detailed description being referred in example below) being respectively arranged with before and after the part of data of optical disk region, also included the region outside CD.
With specific embodiment, the shaven head jump control method of above-mentioned optical disc apparatus is elaborated below.
Fig. 4 is the structural representation of the optical disc apparatus that the embodiment of the present invention provides.As shown in Figure 4, in the present embodiment, described optical disc apparatus includes: detection (reading) records the shaven head 11 of signal on the optical disc 10；Spindle motor 22 with high speed rotating CD 10；By the stepper motor 13 moving radially shaven head 11 of CD 10；The motor driving chip 14 of drive shaft motor 22 and stepper motor 13 work；Master chip 25 with the whole operation controlling optical disc apparatus, its function specifically includes that for sending SPDL driving signal to motor driving chip 14 in the present embodiment, controlling spindle motor 22 by motor driving chip 14 drives CD 10 to rotate, and described SPDL drives signal to be control, according to the linear velocity (fixing linear velocity) set, the signal that spindle motor rotates；Being additionally operable to send PU to motor driving chip 14 and drive signal, control stepper motor 13 by motor driving chip 14 and drive shaven head 11 to move to realize jumping, described PU drives signal to be the signal allowing shaven head 11 move that master chip 25 is computed sending.In specific embodiment, described master chip 25 incorporates the controller of the whole operation of digital signal processor and control optical disc apparatus.
It should be noted that, in the present embodiment, spindle motor 22 is distinctive in that with spindle motor 12 shown in Fig. 1, spindle motor 12 is brushless motor, FG sensor 121 is installed, it is possible to monitor the rotating speed of CD in real time, and spindle motor 22 is brush motors, not there is FG sensor, therefore, it is difficult to monitor the rotating speed of CD in real time.Spindle motor 22, relative to spindle motor 12, owing to eliminating FG sensor and relevant control loop, therefore simplifies structure, reduces cost.But, spindle motor 22 is not limited to brush motors, in other embodiments, spindle motor 22 can also be brushless motor (having FG sensor), and the shaven head jump control method of the optical disc apparatus that embodiment of the present invention provides can be suitable for equally.
In prior art, optical disc apparatus mainly has constant linear velocity (CLV, ConstantLinearVelocity), Constant Angular Velocity (CAV, ConstantAngularVelocity) and 3 kinds of disk-read modes of Partial Constant Angular Velocity (PCAV, PartialCAV).Constant linear velocity CLV technology refers to that the orbital arc line length read in the unit interval is equal from the inner ring of CD to outer ring moving process.It is to keep data transmission rate constant, and changes the speed rotating CD at any time.Owing to the inner radii of CD is less than outer radii, therefore shaven head rotary speed when inner ring natural than near outer ring time fast, the rotary speed reading CD inner ring data is natural fast more many than outer ring, also only in this way could meet message transmission rate and remain unchanged this requirement.The feature of Constant Angular Velocity CAV technology is that its message transmission rate is variable in order to keep rotation speed constant, and namely shaven head is when reading the data of CD inner ring and outer ring, and message transmission rate can change therewith, more more can embody the speed of CD-ROM drive toward CD outer ring.It is then merged a kind of technology that both CLV and CAV elite is formed as Partial Constant Angular Velocity PCAV technology.When shaven head reads the inner ring data of CD, rotary speed remains unchanged, and makes message transmission rate be increased；And when shaven head reads outer ring data, then rotary speed is promoted.
Present CD-ROM drive generally adopts Partial Constant Angular Velocity PCAV technology, and it combines the advantage of CLV and CAV technology, adopts CLV technology when random reading CD inner ring, transfers CAV mode to and read when reading CD outer ring.PCAV technology is adopted to carry out disk-read, owing to rotary speed is often change, it is necessary to the rotating speed of CD is monitored in real time.But, owing to optical disc apparatus described in the present embodiment cannot monitor the rotating speed of CD in real time, it is therefore desirable to take certain measure to prevent from making because of jump shaven head 11 to fly out data of optical disk region.Inventor considers; since the rotary speed that CD is continually changing cannot be measured; the rotary speed of spindle motor 22 so can be set as the linear velocity fixed, again through taking certain protection mechanism to prevent shaven head from flying out outside CD and to solve because in jump process, shaven head flies out the jump failure caused outside data of optical disk region.The specific embodiment of the shaven head jump control method of described optical disc apparatus is as follows:
Fig. 5 is an embodiment schematic flow sheet of shaven head jump control method provided by the invention.In the present embodiment, for the ease of to judging that the bare headed result that whether will jump to deathtrap stores, therefore a dangerous alarming sign it is provided with, when judging that shaven head will jump to deathtrap based on current linear velocity, then this danger alarming sign is set on state, otherwise this danger alarming sign is then set to off closed state, and the follow-up result having only to according to storage takes corresponding step.Described dangerous alarming sign initial default value is closed mode.In specific implementation process, can adopting, for described shaven head jump control method, the realization that programs, described dangerous alarming sign is specially parameter set in program, and its opening or closed mode can represent with this parameter value for 1 or 0 respectively.
The flow process that is embodied as of described shaven head jump control method consults Fig. 5, step S201 is first carried out, drives CD with fixing linear velocity；Then step S202, receives skip instruction, performs step S203, judge whether shaven head will jump to deathtrap based on current linear velocity after step S202, and described deathtrap refers to the region beyond data of optical disk region；Otherwise directly perform step S205 to jump, be then perform step S204, danger alarming sign be set on state, perform step S205 afterwards again and jump；
After step S205, perform step S206, it is judged that whether successful jump, be then perform step S208, danger alarming sign be set to off closed state, and perform step S209, terminate to jump；It should be noted that, step S206 judges jump whether successfully refer to whether shaven head jumps to target location exactly, owing to shaven head is when jumping, likely there will be the deviation of jump, produce to jump situation (detailed description seen below) that is not enough or that skip head, so it is accomplished by one or many again to jump, till jumping to target location, therefore, in the embodiment of the present invention, indication jumps successfully both to have included once jumping and just reaches the situation of target location, also the Multiple hop because carrying out again after jumping deficiency or skipping head (being still within data of optical disk region) the situation finally successfully jumping to target location are included；And the jump of indication unsuccessfully refers to that shaven head is skipped head and jumps out the situation in data of optical disk region in the embodiment of the present invention, now judge that jump is unsuccessful；
Otherwise perform step S207, it is judged that whether dangerous alarming sign is opening, otherwise forwards step S203 to, be then perform step S210, danger alarming sign be set to off closed state, and perform step S211, reduce current linear velocity；It should be noted that, even if owing to judging that shaven head will not jump to deathtrap it can also happen that the failed situation of jumping, now then do not reduce current linear velocity, and be based on current linear velocity and rejudge after whether shaven head will jump to deathtrap and jump, namely step S207 judges that dangerous alarming sign is not in opening, then forward step S203 to.
Step S203 is forwarded to, so until jumping successfully after step S211.
Wherein, step S203, judge whether shaven head will jump to deathtrap based on current linear velocity, specifically comprise the steps that
The track number A of movement needed for calculating from current location to target location based on current linear velocity；
The start position from current location to CD or the track number B of movement needed for final position is calculated based on safety line velometer；
If described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position, namely as A > B, it is determined that shaven head will jump to deathtrap.
Described safety line speed refers to that guaranteeing jumps and in no case can occur that shaven head flies out the linear speed angle value of situation in data of optical disk region or scope.Owing to the track number of movement and current linear velocity are directly proportional needed for from current location to target location, say, that current linear velocity is excessive easily makes shaven head fly out data of optical disk region, adopts slower linear velocity then to compare safety.Under safety line speed, linear velocity is relatively low, and when jumping, shaven head will not fly out outside data of optical disk region, it is taken as that it is safe for jumping.But, if driving CD with safety line speed all the time, although shaven head can compare safety when jumping, but owing to this linear velocity is relatively low, the time of time and shaven head jump that shaven head reads data of optical disk (abbreviation disk-read) all can be long, in order to improve the efficiency of disk-read and jump, can adopt at the beginning and go to drive CD than safety line speed linear velocity faster.
It should be noted that, needed for described start position from current location to CD or final position, the track number B of movement is divided into two kinds of situations, that is: if jumping from current location to the inner ring of CD, then the track number B1 of movement needed for the start position from current location to CD is calculated based on safety line velometer；If jumping from current location to the outer ring of CD, then calculate the track number B2 of movement needed for the final position from current location to CD based on safety line velometer.Therefore, the comparison carried out between A and B, it is actually not coexisting between A and B1 or comparing between A and B2 according to the direction jumped, namely as A > B1 or A > B2, it is determined that shaven head will jump to deathtrap.
In addition; judging whether shaven head will jump to deathtrap is protection mechanism during a kind of shaven head jump; judge that shaven head will jump to deathtrap and be not meant to jump under current linear velocity and just inherently make shaven head fly out data of optical disk region based on current linear velocity; and simply system for prompting has soon flown out; counter-measure should be taked in time, it is ensured that jump efficiency.It is true that because stepper motor drives shaven head to move error, sometimes judge after calculating that shaven head will jump to deathtrap, but the result of actual jump be likely to and less than that position.If it is judged that simply slightly into deathtrap, and the error that stepper motor moves makes the actually this jump will not be failed, and that just need not slow down.Jump and have two kinds of modes not reaching target location: skip head and jump deficiency.Wherein, skip head and refer to that jump has exceeded target location; if being still within data of optical disk region after jumping; only occur in that the precision problem of jump; then only need to continue in current location back to jump till target location; and (even jump out CD) if having jumped out beyond data of optical disk region; here it is the problem to solve; because head of skipping in this case easily makes shaven head fly out and the ratio relatively hazardous (being likely to shaven head is caused damage) that seems, therefore in this case need to protect；And jump deficiency, then can continue in current location to jump forward till target location, although spend more some time, but do not have danger, so need not protect.Usually; in embodiment of the present invention, jumping of indication unsuccessfully only refers to skip head and jump out the situation beyond data of optical disk region; specifically; jump to the situation of protection zone (ingress area of CD or export area) beyond data of optical disk region including shaven head, also include based on judging that shaven head will jump out outside CD and makes the shaven head of jump stop at the situation on border in described data of optical disk region.
One skilled in the art will appreciate that the data storage method of CD, deposit data with continuous print spiral path that the size of the regional of its track and what density was just as so can ensure that the memory allocation of data is more reasonable.Consult Fig. 2, postulated point c is the current location (track at current read data place) of shaven head 11, as previously mentioned, point a is the start position of CD 10, point b is the final position of CD 10, shaven head 11 along with CD 10 rotate along radius move horizontally the data read on spiral path time, displacement calculates with through several tracks (track), namely laterally cuts through the bar number of track.
Mathematical expression π R can be utilized2=KVQX, wherein, R is radius (distance of cd centre to certain track), X is CD (mark, i.e. SectorAddress: sevtor address), K reads the time needed for a sector when constant linear velocity (CLV), and Q is track space, V is CD linear velocity, tries to achieve cd centre respectively to the distance of current orbit and cd centre to the distance of target track.It addition, because disc tracks number (number) N=R/Q, further according to π R2=KVQX, thus N withIt is directly proportional, is inversely proportional to Q.Utilize above-mentioned mathematical expression it is known that current orbit and target track, thus the track number that also just can calculate between current orbit and target track, the track number of movement needed for namely from current orbit to target track.It is fixing linear velocity due to what adopt, therefore CD current location can be calculated to the track number A of movement needed for target location according to current linear velocity, again owing to described safety line speed is also set in advance, the start position from current location to CD or the track number B of movement needed for final position therefore can also be calculated according to described safety line velometer.More than simply simply describe the principle of the track number calculating required movement of jumping, when reality is implemented, calculating for jumping relevant more specifically, can calculate the track number of jump and some other parameter according to the current location jumped and the ID (such as: current location aa:bb:cc, target location dd:ee:ff) of target location.The track number that jumps is calculated as in prior art conventional means, do not repeat them here.
It should be noted that, in a particular embodiment, not only need to judge whether shaven head will jump to deathtrap based on current linear velocity, also need to after judging that shaven head will jump to deathtrap, identify its degree of danger being in deathtrap, namely identify whether shaven head can depart from the region of CD.Actually; some protection zone each before and after data area portion on CD (width of each own about 500 tracks), the respectively export area (Leadout) of the protection zone of the protection zone of inner ring and the ingress area (Leadin) of CD and outer ring and CD.When inner ring is with 0,0 point 0 second (00:00:00) is boundary, and outer ring boundary is exactly data endpoint.Before jump action, it is necessary to first pass through calculating, if the described protection zone of entrance will be jumped under current linear velocity, namely it is judged to jump to deathtrap；If will jump out under current linear velocity protection zone (beyond CD), also it is judged to jump to deathtrap.If the jump identifying shaven head will exceed described protection zone (such as, the value of A-B is more than 500), so automatically the boundary that shaven head arrives described data area (with protection zone) is allowed just to stop, then again jump after being returned to jump front position and reducing current linear velocity, namely perform step S211 and reduce current linear velocity, step S203 is forwarded to after step S211, repeat flow process shown in Fig. 5 until jumping successfully, because being now certain to jump unsuccessfully (skipping head and the data of optical disk region that flies out), so no matter how far to jump, within can guaranteeing that shaven head can be parked in data of optical disk region, will not fly out and break.If first do not calculated before carrying out jump action, then be likely to and cause that shaven head flies out and break.
By jump every time failure and judge shaven head will jump to deathtrap (the present embodiment by judge danger alarming sign whether be opening), just current linear velocity is reduced, CD is driven to carry out the jump of shaven head with the linear velocity after reducing again, until jumping successfully, thus both having can guarantee that jump efficiency, can ensure that again and jumping successfully.In the present embodiment, it is possible to set gradually the linear velocity of multiple class by the size of linear velocity, the linear velocity (minimum linear velocity) of minimum class is described safety line speed.Go to drive CD to jump with the most high-grade linear velocity (maximum linear velocity) at the beginning, along with each jump failure and judge that shaven head will jump to deathtrap, the class of linear velocity can gradually reduce (being down at most safety line speed), until jumping successfully, so both can guarantee that and completed within a short period of time to jump, the jump failure caused outside the data of optical disk region that can solve again to fly out in jump process.
Fig. 6 is another embodiment schematic flow sheet of shaven head jump control method provided by the invention.Consult Fig. 6, in the present embodiment, set gradually into the linear velocity of three class by the size of linear velocity, respectively First Line speed, the second linear velocity, safety line speed.Described First Line speed is the most high-grade linear velocity, optical disc apparatus is drive CD with fixing First Line speed at first, described safety line speed, it it is the linear velocity of minimum class, as it was previously stated, shaven head in no case can be occurred when being able to ensure that jump under this linear velocity to fly out the situation in data of optical disk region.Because CDs different on the market has error, so there is dividing of speed in various CDs linear velocity when playing, it is reported, the linear velocity scope when playing of the CD on the market is 1.068～1.476m/s at present, so, safety line speed is set to 1.0m/s, then can ensure that CD on the market is all within specification, therefore in a particular embodiment, described safety line speed can specifically be set as 1.0m/s.Actual value as described First Line speed, excessive linear speed angle value can not be set, otherwise can judge whether shaven head will jump to deathtrap and affect the efficiency of jump continually, too small linear speed angle value can not be set, otherwise can because of the relatively slow efficiency affecting disk-read and jump equally of disk-read and hopping time.Because the chances are about the 1.272m/s of average linear velocity when dvd playback on the market.Inventor is found by great many of experiments and calculating, and linear velocity constant carries out the jump of ultimate range on various CDs when being 1.2m/s, the existing situation skipping head occurs, and also has and jumps not enough situation generation.Maximum shaven heads probably can skip 2462 tracks, and minimum having is jumped less than 3735.Linear velocity and skip head and be directly proportional, and jump deficiency and be inversely proportional to, it seems that comparatively balance both when comprehensive 1.2m/s.Therefore, described First Line speed is set as that 1.2m/s is proper value, now can will be located in described second linear velocity of the second class linear velocity in the present embodiment and be set as 1.1m/s.
In the present embodiment, for coordinating described dangerous alarming sign, it is also provided with the linear velocity protection counting that initial value is 0, every time judge after unsuccessfully that described danger alarming sign is in opening jumping, then counting is protected to add 1 described linear velocity, then the value according to described linear velocity protection counting gradually reduces current linear velocity, specifically can pass through to identify the value of described linear velocity protection counting, if the value of described linear velocity protection counting is 0 or 1, still CD is driven again to jump with current linear velocity, if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduce the linear velocity of a class.Consider the error that foregoing stepper motor moves; even if judging that shaven head will jump to deathtrap; jump and also have successful possibility; therefore jump after unsuccessfully when first time; keep dangerous alarming sign in the on state; entering the protection flow process that linear velocity sets, linear velocity protection counting adds 1.If once jumping in safety range ensuing, then just need not carry out slowing down, such control is more reasonable and efficient.
Idiographic flow the following detailed description of this embodiment.As shown in Figure 6, first, perform step S301, drive CD with fixing First Line speed；Then step S302, receives skip instruction；
After receiving skip instruction, before judging whether shaven head will jump to deathtrap based on current linear velocity, also include step S303, judge whether current linear velocity is safety line speed, be, perform step S306 and be made directly jump, otherwise perform step S304, judge whether shaven head will jump to deathtrap based on current linear velocity, otherwise forward step S306 to jump, be then perform step S305, danger alarming sign is set on state；Judge that whether shaven head is embodied as step as above described in an embodiment by what jump to deathtrap based on current linear velocity, do not repeat them here.
After step S305, perform step S306, jump；
Step S307, it is judged that whether successful jump, is then perform step S308, danger alarming sign is set to off closed state, then carries out step S309, terminate to jump.As above described in an embodiment; step S307 judges whether success refers to whether shaven head jumps to target location exactly equally in jump; jump unsuccessful or jump and unsuccessfully then refer to that shaven head is skipped head and jumps out the situation in data of optical disk region; specifically include shaven head and jump to the situation of the protection zone (ingress area of CD or export area) beyond data of optical disk region, also include based on judging that shaven head will jump out outside CD and makes the shaven head of jump stop at the situation on border in described data of optical disk region.
If judging that jump is unsuccessful by step S307, then performing step S310, it is judged that whether dangerous alarming sign is opening, otherwise performing step S314, still driving CD with current linear velocity, forward step S303 afterwards to；If step S310 judges that dangerous alarming sign is in opening, perform step S311, protect counting to add 1 linear velocity, then step S312, danger alarming sign is set to off closed state.It should be noted that step S312 can also be arranged in after step S310 judges that dangerous alarming sign is in opening, go before step S311 to perform.
After step S312, perform step S313, identify the value of linear velocity protection counting, if the value identifying described linear velocity protection counting is 0 or 1, performs step S314, still drive CD with current linear velocity；If the value identifying described linear velocity protection counting is 2, then perform step S315, current linear velocity is reduced to the second linear velocity and drives CD；If the value identifying described linear velocity protection counting is 3, then perform step S316, current linear velocity is reduced to safety line speed and drives CD；After performing step S314 or step S315 or step S316, then forwarding step S303 to, repeat above-mentioned correlation step, terminating until jumping.It should be noted that; after the value of linear velocity reaches 1.0m/s just constant; described linear velocity protection counting no longer adds 1; each CD from turning not to start rotate in (namely CD entrance playing flow time; before setting described First Line speed driving CD), by described linear velocity protection counting zero.
It should be noted that, although described safety line speed refers to that guaranteeing jumps and in no case can occur that shaven head flies out the linear speed angle value of situation in data of optical disk region or scope in theory, but in actual implementation process, difference due to ray Disc specifications, even if current linear velocity being down to safety line speed 1.0m/s default in the present embodiment, also it is also possible that there is failed situation (although very little with regard to its probability of CD on the market) of jumping, now shaven head does not return to jump front position and again reduces linear velocity, but be parked in current location and continue to attempt to read target location ID, (count from that time read after having jumped if continuous several times reads unsuccessfully, it it is such as 5 times), then stop playing (disk-read), shaven head retracts the default initial position after CD enters, all restart, namely it is configured resetting (setuprecovery), after reset, current linear velocity also will change back First Line speed 1.2m/s, jump before being no longer attempt to.
In addition, in the present embodiment, consider for safety and timesaving, avoid because being repeatedly confirmed whether that needing deceleration to jump with realization successfully loses time, so current linear velocity is just play (disk-read) by this speed after dropping to 1.0m/s and jumps always, unless arranged the situation (this action is not necessarily to jump and unsuccessfully causes, and other faults cause and cannot continue to play also can reset) of reset or changed the situation of CD.
In the present embodiment; by increasing on the basis of described dangerous alarming sign, described linear velocity protection counting is set; can realize more flexible, easily judging that shaven head will jump to the number of times of deathtrap and gradually reduce the linear velocity of driving CD in basis of jumping after unsuccessfully; both ensure that and completed within a short period of time to jump, the jump failure caused outside the bare headed data of optical disk region that flies out in jump process can have been solved again.
Based on above-mentioned shaven head jump control method, embodiment of the present invention also provides for a kind of shaven head jump and controls device.Fig. 7 is that bare headed jump that embodiment of the present invention provides controls the structural representation of device, as it is shown in fig. 7, described shaven head jumps, control device includes: driver element 31, for driving CD with fixing linear velocity；Judging unit 32, for, after receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；The control unit 33 being connected with described driver element 31 and judging unit 32; for when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region.Specifically, described driver element 31 is by setting fixing linear speed angle value to drive CD, after judging unit 32 receives skip instruction, control judging unit 33 and judge whether shaven head will jump to deathtrap based on current linear velocity, judging unit 32 will determine that after result feed back to control unit 33, then controlled driver element 31 by control unit 33 and adjust current linear speed angle value (for reducing current linear velocity in the present embodiment), set new linear speed angle value to drive CD.
Consult Fig. 7, in the present embodiment, described judging unit 32 includes deathtrap judging unit 322, and described deathtrap judging unit 322 includes: the first computing unit 322a, for the track number of movement needed for calculating from current location to target location based on current linear velocity；Second computing unit 322b, for calculating the start position from current location to CD or the track number of movement needed for final position based on safety line velometer；Determine unit 322c, for when described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position time, it is determined that shaven head will jump to deathtrap.Described judging unit 32 may also include present speed judging unit 321, for after receiving skip instruction, based on current linear velocity, described deathtrap judging unit 322 judges whether shaven head will jump to deathtrap before, judge whether current linear velocity is described safety line speed, it is be made directly jump, is otherwise judged whether shaven head will jump to deathtrap by described deathtrap judging unit 322 based on current linear velocity.In addition, the mark that described judging unit 32 also includes being suitable to arrange dangerous alarming sign arranges unit 323, when based on current linear velocity, described deathtrap judging unit 322 judges that shaven head will jump to deathtrap, described dangerous alarming sign is set on state；The failure and judge that described dangerous alarming sign is in opening if jumping, then reduce current linear velocity, and described dangerous alarming sign be set to off closed state.Described control unit 33 comprises the steps that counting arranges unit 331, for arranging the linear velocity protection counting that initial value is 0, when described judging unit 32 judges that described dangerous alarming sign is in opening, then adds 1 by the value of described linear velocity protection counting；Wire velocity control unit 332, for gradually reducing current linear velocity according to the value of described linear velocity protection counting, specifically comprises the steps that the linear velocity setting gradually multiple class by the size of linear velocity；Identify the value of described linear velocity protection counting; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduces the linear velocity of a class.In a particular embodiment, the described control device that jumps can be integrated among master chip 25 shown in Fig. 4, and master chip 25 is included in optical disc apparatus illustrated in fig. 4.
Jump about described shaven head and control the embodiment being embodied as being referred to above-mentioned shaven head jump control method of device and optical disc apparatus, do not repeat them here.
To sum up, optical disc apparatus that embodiment of the present invention provides and shaven head jump control method and device thereof, at least have the advantages that
By adopting fixing linear velocity to drive CD, and after receiving skip instruction, judge whether shaven head will jump to deathtrap based on current linear velocity, when jump failure and judge that shaven head will jump to deathtrap, then reduce current linear velocity and again jump, it is thus possible to prevent shaven head from flying out cause damage outside CD, effectively solve shaven head in jump process and fly out data of optical disk region and the jump failure that causes, it is ensured that jump successfully.
The linear velocity of multiple class is set; first drive CD with linear velocity faster; after receiving skip instruction; by described dangerous alarming sign and linear velocity protection counting; thus convenient, realize neatly to jump to the number of times of deathtrap and gradually reducing the linear velocity that drives CD according to identifying shaven head after unsuccessfully jumping; both can guarantee that and completed within a short period of time to jump, the jump failure that solving again flies out in shaven head jump process causes outside data of optical disk region.
Optical disc apparatus have employed brush motors, guaranteeing that shaven head jumps successfully simultaneously, simplifies structure, reduces cost.
Although the present invention is with preferred embodiment openly as above; but it is not for limiting the present invention; any those skilled in the art are without departing from the spirit and scope of the present invention; may be by the method for the disclosure above and technology contents and technical solution of the present invention is made possible variation and amendment; therefore; every content without departing from technical solution of the present invention; according to any simple modification, equivalent variations and modification that above example is made by the technical spirit of the present invention, belong to the protection domain of technical solution of the present invention.
Claims (15)
1. the shaven head jump control method of an optical disc apparatus, it is characterised in that including:
CD is driven with fixing linear velocity；
After receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；
Jump; when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region；
Repeat the above steps is until jumping successfully.
2. shaven head jump control method according to claim 1, it is characterised in that described judge whether shaven head will jump to deathtrap and include based on current linear velocity:
The track number of movement needed for calculating from current location to target location based on current linear velocity；
The start position from current location to CD or the track number of movement needed for final position is calculated based on safety line velometer；
If described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position, it is determined that shaven head will jump to deathtrap.
3. shaven head jump control method according to claim 2, it is characterized in that, after receiving skip instruction, before judging whether shaven head will jump to deathtrap based on current linear velocity, also include judging whether current linear velocity is described safety line speed, it is be made directly jump, otherwise judges whether shaven head will jump to deathtrap based on current linear velocity.
4. shaven head jump control method according to claim 2, it is characterised in that also include arranging dangerous alarming sign, when determining that shaven head will jump to deathtrap, is set on state by described dangerous alarming sign；The failure and judge that described dangerous alarming sign is in opening if jumping, then reduce current linear velocity, and described dangerous alarming sign be set to off closed state.
5. shaven head jump control method according to claim 4; it is characterized in that; also include arranging the linear velocity protection counting that initial value is 0; when judging that described dangerous alarming sign is in opening; then the value of described linear velocity protection counting is added 1, gradually reduce current linear velocity according to the value of described linear velocity protection counting.
6. shaven head jump control method according to claim 5, it is characterised in that gradually reduce current linear velocity according to the value of described linear velocity protection counting and include:
The linear velocity of multiple class is set gradually by the size of linear velocity；
Identify the value of described linear velocity protection counting; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduces the linear velocity of a class.
7. shaven head jump control method according to claim 6; it is characterized in that; the linear velocity of three class is set gradually by the size of linear velocity; respectively First Line speed, the second linear velocity, described safety line speed; first drive CD with described First Line speed; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is 2; then drive CD with described second linear velocity; if the value of described linear velocity protection counting is 3, then drive CD with described safety line speed.
8. shaven head jump control method according to claim 7, it is characterised in that described First Line speed is 1.2m/s, and described second linear velocity is 1.1m/s, and described safety line speed is 1.0m/s.
9. a shaven head jumps and controls device, it is characterised in that including:
Driver element, for driving CD with fixing linear velocity；
Judging unit, for, after receiving skip instruction, judging whether shaven head will jump to deathtrap based on current linear velocity, described deathtrap refers to the region beyond data of optical disk region；
Control unit; for when jump failure and judge that shaven head will jump to deathtrap; then reducing current linear velocity, described jump unsuccessfully refers to and jumps to protection zone beyond described data of optical disk region or based on outside CD of judging to jump out and the border making the shaven head of jump stop at described data of optical disk region.
10. shaven head according to claim 9 jumps and controls device, it is characterised in that described judging unit includes deathtrap judging unit, and described deathtrap judging unit includes:
First computing unit, for the track number of movement needed for calculating from current location to target location based on current linear velocity；
Second computing unit, for calculating the start position from current location to CD or the track number of movement needed for final position based on safety line velometer；
Determine unit, for when described from current location to target location needed for the track number of movement more than described start position from current location to CD or the track number of movement needed for final position time, it is determined that shaven head will jump to deathtrap.
11. shaven head according to claim 10 jumps and controls device, it is characterized in that, described judging unit also includes present speed judging unit, for after receiving skip instruction, before judging whether shaven head will jump to deathtrap based on current linear velocity, judge whether current linear velocity is described safety line speed, be made directly jump, otherwise judged whether shaven head will jump to deathtrap by described deathtrap judging unit based on current linear velocity.
12. shaven head according to claim 10 jumps and controls device, it is characterized in that, the mark that described judging unit also includes being suitable to arrange dangerous alarming sign arranges unit, when determining that shaven head will jump to deathtrap, described dangerous alarming sign is set on state；The failure and judge that described dangerous alarming sign is in opening if jumping, then reduce current linear velocity, and described dangerous alarming sign be set to off closed state.
13. shaven head according to claim 12 jumps and controls device, it is characterised in that described control unit includes:
Counting arranges unit, for arranging the linear velocity protection counting that initial value is 0, when described judging unit judges that described dangerous alarming sign is in opening, then adds 1 by the value of described linear velocity protection counting；
Wire velocity control unit, for gradually reducing current linear velocity according to the value of described linear velocity protection counting.
14. shaven head according to claim 13 jumps and controls device, it is characterised in that described wire velocity control unit gradually reduces current linear velocity according to the value of described linear velocity protection counting and includes:
The linear velocity of multiple class is set gradually by the size of linear velocity；
Identify the value of described linear velocity protection counting; if the value of described linear velocity protection counting is 0 or 1, still drive CD with current linear velocity; if the value of described linear velocity protection counting is more than 1, then the value of described linear velocity protection counting often increases by 1, reduces the linear velocity of a class.
15. one kind includes shaven head jump described in any one of claim 9 to 14 and controls the optical disc apparatus of device.
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| WO2005106861A1 (en) * | 2004-05-04 | 2005-11-10 | Koninklijke Philips Electronics N.V. | Head range controlled jumping |
| CN1825444A (en) * | 2004-12-15 | 2006-08-30 | 株式会社日立制作所 | Information recording apparatus, information reproducing apparatus, information recording method, and information reproducing method |
| CN1950894A (en) * | 2004-05-04 | 2007-04-18 | 皇家飞利浦电子股份有限公司 | Motor transfer rate calibrated jumping |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005106861A1 (en) * | 2004-05-04 | 2005-11-10 | Koninklijke Philips Electronics N.V. | Head range controlled jumping |
| CN1950894A (en) * | 2004-05-04 | 2007-04-18 | 皇家飞利浦电子股份有限公司 | Motor transfer rate calibrated jumping |
| CN1825444A (en) * | 2004-12-15 | 2006-08-30 | 株式会社日立制作所 | Information recording apparatus, information reproducing apparatus, information recording method, and information reproducing method |
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