CN1482607A - Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude - Google Patents
Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude Download PDFInfo
- Publication number
- CN1482607A CN1482607A CNA021320519A CN02132051A CN1482607A CN 1482607 A CN1482607 A CN 1482607A CN A021320519 A CNA021320519 A CN A021320519A CN 02132051 A CN02132051 A CN 02132051A CN 1482607 A CN1482607 A CN 1482607A
- Authority
- CN
- China
- Prior art keywords
- disc
- fluctuation
- non equilibrium
- differentiate
- equilibrium disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
The invention discloses a process for determining the unbalanced disc in the computer's CD-ROM drive system through amplitude of fluctuation, which comprises, moving the focusing object lens towards the disc direction, detecting the forestage signal produced by the falling of focal spot on the discs, calculating the time generated by the backing stage signal continuously, which is used to produce reflected signal to the photo-sensor, and performing non-identity operation to the signal on the photo-sensor by means of the prime amplifier, thus enabling the prime amplifier to generate multiple signals.
Description
Technical field
The present invention relates to a kind of method of differentiating the non equilibrium disk in the computer CD ROM system, particularly about a kind of when utilizing the rotation of different discs the difference of its beat amount judge disc for non equilibrium disk or be the method for general disc.
Background technology
The purpose of CD-ROM drive servo-control system (servo control system), be to control accurately the position of focusing objective len (objective lens), disc is reached up and down when deflecting producing because of rotation, still laser focus point can be maintained on the disc data layer, thereby produce the optical reflection signal, this signal comprises the source signal of digital signal, and the feedback signal of servo-control system (feedback signal).
Yet for a perfectly positive circular disc, its physical characteristics can not change along with the difference of the position on the disc, therefore rotates the situation that disc can not cause beat in theory.But the density of each point is not quite similar on the disc because the error of making makes, even has non-circular disc etc. special formed, causes the barycenter of disc and rotation center can not drop on the same point, and will make disc because of uneven (unbalance) generation beat.Under general situation, the beat up and down that the disc rotation is caused, the focusing error amount that can utilize the optical reflection signal to be reflected, by servo feedback control system, the focusing error amount is produced a control voltage by the compensator processing, drive focusing objective len by power amplifier again, be locked in tightly on the disc data layer to keep focus point.
In the ordinary course of things, the disc that amount of unbalance is big more will produce big more feedback error signal, thereby the compensator driving force that corresponding generation is big more, to read the data on the disc.Simultaneously, the beat amount also changes along with the rotating speed of Spindle Motor, and principal axis motor rotation speed is big more, the beat amount is big more, when disc beat amount arrives certain degree, for the compensator that has designed in advance, may cause CD-ROM system to produce phenomenons such as slide rail and mistake Jiao, and cause the failure of data read; And owing in the present CD-ROM drive, all as much as possible improve the rotating speed of Spindle Motor, this moment non equilibrium disk because of the noise that high speed rotating and windage are produced, then be not to use person and deviser receptible.Therefore correctly and apace determine the beat amount of disc, and according to this maximum speed of Spindle Motor is made suitable adjustment, so that can be more smooth in the data access process, unlikely generation slide rail and defocusing phenomenon, and the vibrating noise of CD-ROM drive dropped to endurable scope.
The method that tradition is differentiated non equilibrium disk is under the servo-control system effect, error signal (as focus on, tracking error) will periodically generate along with the rotational frequency of Spindle Motor, when error signal during, then assert this disc unbalance disc greater than default value.But the method needs continuous detection of error signals state, and error signal produces periodically variable reason, does not have only non equilibrium disk to cause, and just may cause the situation of judging by accident as the scratch on the disc.
As from the foregoing, the method for above-mentioned differentiation non equilibrium disk on reality is used, obviously has inconvenience and exists with defective, remains further to be improved.
Summary of the invention
Fundamental purpose of the present invention, be to provide a kind of method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, the beat up and down that utilizes disc to cause because of rotation, only near focus point, just can make pre-amplifier that the characteristic of signal output is arranged by focusing objective len, whether the beat amplitude of estimation disc is non equilibrium disk with the differentiation disc indirectly.
To achieve these goals, the invention provides a kind of method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, drive Spindle Motor earlier and make disc rotate to selected fixed rotating speed, also comprise the following step:
(a) focusing objective len is moved toward the disc direction;
(b) detect the prime signal that focus point falls within on the disc to be generated; And
Whether (c) calculate the time that this prime signal continues generation, be non equilibrium disk to judge disc.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the principal axis motor rotation speed of described CD-ROM drive is selected according to the mechanism characteristics of this CD-ROM drive, and the gap of beat amplitude about general disc and the non equilibrium disk can be widened.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, described step (b) is to generate this prime signal when this focus point falls within the reflection horizon of this disc.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, described step (a) further comprises the step that this focusing objective len is sunk to the bottom before.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the speed of the focusing objective len rate travel of described step (b) needs to adjust according to the timer resolution of internal system.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, described focusing objective len rate travel is a constant speed.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the prime signal of described step (b) is RF, FE, TE and the SBAD signal in the optical disk system.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the prime signal of described step (b) is that pre-amplifier produces.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the moment that the prime signal of described step (b) generates is promptly represented the position of beat bottom of this focus point contact disc of this moment, and described beat bottom position is the reflection horizon of disc.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the moment that the prime signal of described step (b) stops to produce is promptly represented the beat position, the top of the focus point contact disc of this moment, and beat position, described the top is the reflection horizon of disc.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, the time that the prime signal continues to produce in the described step (c) is greater than a setting value, then representing disc is non equilibrium disk, and the prime signal continues the time of generation less than this setting value, and then representing disc is general disc.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system, wherein, described setting value is by the firmware definition of CD-ROM system inside.
The aforesaid method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system wherein, after described disc is judged to be non equilibrium disk, then can reduce principal axis motor rotation speed, to reduce non equilibrium disk because of noise that high speed rotating was produced.
The invention has the beneficial effects as follows, only need suitably choose the rate travel of focusing objective len, and set the threshold of judging the non equilibrium disk signal rise time, can belong to balance or imbalance is made fast and right judgement disc; Whether utilizing the length of judging prime signal generation time, is the method for amount of unbalance disc to assert this disc, can effectively avoid prior art to utilize the error in judgement signal greater than prior setting value, the erroneous judgement that is caused easily (as the scratch on the disc).
The invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the synoptic diagram that inner pre-amplifier signal generates in the CD-ROM system;
Fig. 2 is the synoptic diagram of disc beat amount and focusing objective len relevant position;
Fig. 3 is a process flow diagram of differentiating non equilibrium disk for the present invention.
Embodiment
As shown in Figure 1, because servosignal and RF (Radio Frequency) signal in CD-ROM system, the focus point that all comes from focusing objective len 2, and be reflected back on the optical sensor 3 (photo detector) by the reflection horizon 11 of disc 1, in the time of promptly near focus point falls within reflection horizon 11, (pre-amp) does nonidentity operation with the signal on the optical sensor 3 by pre-amplifier 4, and generate other multiple signal for utilization, as RF, FE (Focus Error), TE (Track Error) and SBAD (Sub Beam Add) etc.
If so method of the present invention promptly is that then pre-amplifier 4 will produce signal (as RF, FE, TE and SBAD etc.), thereby judge the position of disc 11 when utilizing the reflection horizon 11 of disc 1 to be positioned near the focus point.
As shown in Figure 2, when 1 rotation of different discs, its beat amount will increase along with the increase of amount of unbalance thereupon, that is to say that on behalf of focus point, this characteristic can produce the scope of reflected signal for bigger on disc 1.
Therefore under the rotating speed of selected Spindle Motor, promote focusing objective len 2 by constant speed, make focus point fall within the reflection horizon 11 of disc 1, and the output signal (signal of RF as shown in Figure 1, FE, TE and SBAD) of detection pre-amplifier 4, promote the reflection horizon 11 that focusing objective len 2 draws near focus point and passes through disc 1 by CD-ROM drive servo-control system constant speed, then can detect the beat discharge amplitude size that disc 1 rotation is caused according to the length of signal output time.That is to say if time of signal output when surpassing a certain setting value, this disc 1 can be regarded as non equilibrium disk, otherwise promptly regard as general disc, and this setting value can be defined by the program curing in firmware (the firmware)-hardware of CD-ROM system.
And the rotating speed of above-mentioned Spindle Motor is to select according to the mechanism characteristics of CD-ROM drive, the rotating speed that is to say disc 1 needs much larger than the optical read head ascending velocity, and selected criterion is principle for the gap of beat amplitude about general disc and the non equilibrium disk being widened; The speed of focusing objective len 2 rate travels then needs to do suitable adjustment according to the timer resolution of internal system.
As shown in Figure 3, for the present invention judges the process flow diagram of non equilibrium disk, the action that non equilibrium disk is differentiated is to be carried out by firmware (program curing in the hardware), includes the following step:
Step 51: behind the operating of optical drive, promptly rotate disc 1 to selected rotating speed, and the selected of rotating speed is according to above-mentioned criterion, so that being widened the gap of beat amplitude about general disc and the non equilibrium disk, principal axis motor rotation speed is principle, and the speed of the rate travel of focusing objective len needs to do suitable adjustment according to the timer resolution of internal system;
Step 52: focusing objective len 2 is sunk to the bottom, open the laser diode preparation is begun to seek disc 1 by lowermost end opposite position;
Step 53: the flutter rate (slew rate) of selected focusing coil control voltage, move to drive focusing objective len 2 by power amplifier;
Step 54: with focusing objective len 2 past disc 1 direction constant speed movement, so that make the focus point of focusing objective len 2 can be locked in the reflection horizon 11 of disc 1;
Whether step 55: detecting has the prime signal to produce, promptly when focusing objective len 2 moves toward disc 1 direction, when focus point fell near the reflection horizon 11 of disc 1, the signal that optical sensor 3 is sensed will be by the signal of pre-amplifier 4 generations as RF, FE, TE and SBAD;
Then skip to step 56 if produce signal;
If do not produce signal, then return step 55 and continue to judge;
Step 56: after producing signal, timing begins, and the time that is continued after producing for the prime signal is calculated;
Step 57: detect because of whether the prime signal that generates by focus point continues to produce, promptly judge in the beat amplitude when whether focus point still falls within disc 1 rotation;
If focus point still falls within the beat amplitude, then return step 57 and continue to do to detect to judge;
If focus point outside the beat amplitude, then skips to step 58, promptly represent outside the beat amplitude when focus point has fallen within disc 1 rotation;
Step 58: timing finishes.
Step 59: whether the time that the prime signal continues to produce has surpassed setting value;
If then skip to step 60;
If not, then skip to step 61;
Step 60 is judged to be non equilibrium disk.
Step 61: be judged to be general disc.
According to above-mentioned determination methods, when CD-ROM drive activates running, different discs 1 (as non equilibrium disk and balance disc) will produce reaching up and down and deflect in various degree because of rotation, event will produce the prime signal near falling within disc 1 reflection horizon 11 by focus point, and time of continuing of the signal that has that it's too late of further judging the prime signal, represent when promptly the prime signal occurs that focus point falls near the reflection horizon 11 of disc 1.And the time that the prime signal continues is promptly represented the beat amount size of disc 1, that is to say that focusing objective len 2 is under the flutter rate (slew rate) of fixing control voltage, by the zone of beat up and down that disc 1 amount of unbalance is caused, its duration will be directly proportional with the beat amount.So when focusing objective len 2 sinks to the bottom the back when disc 1 direction moves, the moment of the generation of prime signal is promptly represented the position of beat bottom (as shown in Figure 2) in focus point contact disc 1 reflection horizon 11 of this moment, whether and focusing objective len 2 continues toward the tops of disc 1 beat directions when mobile, and detect the prime signal and still continue to produce.
Promptly represent the beat position, the top (equally as shown in Figure 2) in focus point contact disc 1 reflection horizon 11 of this moment when the moment that the prime signal stops to produce, utilize these characteristics whether to surpass selected in advance setting value, and can calculate time that the prime signal continues and make comparisons with a setting value according to the time interval.Can assert then that greater than setting value this disc 1 is non equilibrium disk, can assert then that less than setting value this disc is the balance disc when the time that the prime signal continues when the time that the prime signal continues.
In view of the above, after judging disc 1 and belonging to non equilibrium disk, can reduce the rotating speed of Spindle Motor, the vibrating noise that makes us ear-piercing that produced when avoiding Spindle Motor to rotate because of high-velocity zone Moving plate sheet.
So, by the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system of the present invention, have characteristics described as follows:
(1) only need suitably choose the rate travel of focusing objective len, and set the threshold of judging the non equilibrium disk signal rise time, can belong to balance or imbalance is made fast and right judgement disc.
Whether (2) utilizing the length of judging prime signal generation time, is the method for amount of unbalance disc to assert this disc, can effectively avoid prior art to utilize the error in judgement signal greater than prior setting value, the erroneous judgement that is caused easily (as the scratch on the disc).
The above only is the detailed description and the accompanying drawing of the specific embodiment of one of the best of the present invention, and all spirit of claim of the present invention and embodiment that its equivalence changes of meeting all should be included in the category of the present invention.
Claims (15)
1, a kind of method of utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system is characterized in that, comprises the following step:
(a) focusing objective len is moved toward the disc direction;
(b) detect the prime signal that focus point falls within on the disc to be generated; And
Whether (c) calculate the time that this prime signal continues generation, be non equilibrium disk to judge disc.
2, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1, it is characterized in that, the principal axis motor rotation speed of described CD-ROM drive is selected according to the mechanism characteristics of this CD-ROM drive, and the gap of beat amplitude about general disc and the non equilibrium disk can be widened.
3, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that described step (b) is to generate this prime signal when this focus point falls within the reflection horizon of this disc.
4, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that described step (a) further comprises the step that this focusing objective len is sunk to the bottom before.
5, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that, the speed of the focusing objective len rate travel of described step (b) needs to adjust according to the timer resolution of internal system.
6, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that described focusing objective len rate travel is a constant speed.
7, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that the prime signal of described step (b) is RF, FE, TE and the SBAD signal in the optical disk system.
8, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that the prime signal of described step (b) is that pre-amplifier produces.
9, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1 is characterized in that, the moment that the prime signal of described step (b) generates is promptly represented the position of beat bottom of this focus point contact disc of this moment.
10, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 9 is characterized in that described beat bottom position is the reflection horizon of disc.
11, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 10, it is characterized in that the moment that the prime signal of described step (b) stops to produce is promptly represented the beat position, the top of the focus point contact disc of this moment.
12, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 11 is characterized in that beat position, described the top is the reflection horizon of disc.
13, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 1, it is characterized in that, the time that the prime signal continues to produce in the described step (c) is greater than a setting value, then representing disc is non equilibrium disk, and the prime signal continues the time of generation less than this setting value, and then representing disc is general disc.
14, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 13 is characterized in that, described setting value is by the firmware definition of CD-ROM system inside.
15, the method for utilizing amplitude of fluctuation to differentiate the non equilibrium disk in the CD-ROM system as claimed in claim 13, it is characterized in that, after described disc is judged to be non equilibrium disk, then can reduce principal axis motor rotation speed, to reduce non equilibrium disk because of noise that high speed rotating was produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02132051 CN1224016C (en) | 2002-09-09 | 2002-09-09 | Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02132051 CN1224016C (en) | 2002-09-09 | 2002-09-09 | Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1482607A true CN1482607A (en) | 2004-03-17 |
| CN1224016C CN1224016C (en) | 2005-10-19 |
Family
ID=34145091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02132051 Expired - Fee Related CN1224016C (en) | 2002-09-09 | 2002-09-09 | Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1224016C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452177C (en) * | 2004-07-28 | 2009-01-14 | 建兴电子科技股份有限公司 | Method for examining tunbalanced disk |
| CN114001676A (en) * | 2021-10-11 | 2022-02-01 | 中国科学院上海光学精密机械研究所 | Optical axis automatic alignment method for detecting optical element by knife edge instrument |
-
2002
- 2002-09-09 CN CN 02132051 patent/CN1224016C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100452177C (en) * | 2004-07-28 | 2009-01-14 | 建兴电子科技股份有限公司 | Method for examining tunbalanced disk |
| CN114001676A (en) * | 2021-10-11 | 2022-02-01 | 中国科学院上海光学精密机械研究所 | Optical axis automatic alignment method for detecting optical element by knife edge instrument |
| CN114001676B (en) * | 2021-10-11 | 2023-11-03 | 中国科学院上海光学精密机械研究所 | Optical axis automatic alignment method for knife edge instrument detection optical element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1224016C (en) | 2005-10-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1140898C (en) | Optical-disk discrimination device | |
| CN1246845C (en) | Servo error detecting method and equipment, method for control disk recording/playback equipment servo | |
| CN1186774C (en) | CD driver and mehtod for distinguishing the CD mounted on the same | |
| JP2911823B2 (en) | Method for minimizing lead-in time in an optical disk recording / reproducing apparatus capable of reproducing multiple disks | |
| JP2002222522A (en) | Information disk recording/reproducing device and vibration detecting method of information disk recording /reproducing device | |
| CN100347759C (en) | Optical disc apparatus | |
| CN1224016C (en) | Method for distinguishing unbalanced disc of CD-ROM system using swing amplitude | |
| CN1729516A (en) | Disc drive with improved resistance against mechanical shocks | |
| CN1499490A (en) | Device and method for distinguishing recording medium type, and medium including readable code | |
| CN1542786A (en) | Optical head and information recording and reproducing including the optical head | |
| CN1211789C (en) | Optical head and optical disc device | |
| CN1551147A (en) | Optical disc system and method for controlling movement of an optical pickup to an innermost perimeter of an optical disc | |
| US6934232B2 (en) | Method for detecting an unbalanced disk in an optical disk reading device | |
| CN1293543C (en) | Optic disc device | |
| CN1862676A (en) | Optical disk device and method for performing focus draw-in operation thereon | |
| KR20040025256A (en) | Method for discriminating tilt between optical pickup and optical disc | |
| US8027229B2 (en) | Focus control device, and optical disc device | |
| CN1256723C (en) | Placement detecting method for optical storage device | |
| JP2003016678A (en) | Tilt detector | |
| CN1294572C (en) | Optical disc device | |
| CN1206637C (en) | Regulating method of reference electrical level | |
| CN1881427A (en) | Optical disc signal processing apparatus and optical disc reproduction apparatus | |
| JP2004118912A (en) | Optical disk drive and control method thereof | |
| CN1975884A (en) | Optical disk recording, reproducing device and its seek control method | |
| CN1458647A (en) | Bias chip detection method for thin optical disc machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20051019 Termination date: 20090909 |