CN100354952C - Method and device for testing eccentricity degree in optical drive - Google Patents
Method and device for testing eccentricity degree in optical drive Download PDFInfo
- Publication number
- CN100354952C CN100354952C CNB2005100730861A CN200510073086A CN100354952C CN 100354952 C CN100354952 C CN 100354952C CN B2005100730861 A CNB2005100730861 A CN B2005100730861A CN 200510073086 A CN200510073086 A CN 200510073086A CN 100354952 C CN100354952 C CN 100354952C
- Authority
- CN
- China
- Prior art keywords
- rail
- count
- distance
- apart
- discs
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Abstract
The present invention relates to a method and a device for testing eccentricity degree in an optical drive. Firstly, a referential track which is M trace number far away from the existing light track is set, and the preset minimum spacing track number, the maximum spacing track number and the testing time are set. Moreover, in the testing time, the following steps are executed: when a data track crossed with the light track on an optical disc is judged to move to the referential track in relation to the light track, the spacing track number M is increased, and otherwise, the spacing track number M is decreased. When the spacing track number is less than the smallest spacing track number, the minimum spacing track number is set to the spacing track number. When the spacing track number is larger than the maximum spacing track number, the maximum spacing track number is set to the spacing track number. Hereby, the eccentric track number equals to the maximal spacing track number subtracts the minimum spacing track number.
Description
Technical field
The present invention relates to method and device that a kind of eccentric degree detects, refer to a kind of method and device that eccentric degree detects in the CD-ROM drive that be applied to especially.
Background technology
Along with the progress of Information technology, the discs that can store mass data has become the main medium of computer equipment, is equipped with and be used for the standard that the CD-ROM drive of writable disc sheet also becomes computing machine.Fig. 1 shows the synoptic diagram of a discs 11 canned datas, and wherein, it is that the center is and is close to a plurality of data-tracks 112 that concentric circles distributes with the disc center of circle 111 that discs 11 surfaces have one, in order to record information.Fig. 2 is the synoptic diagram that a CD-ROM drive reads the information on the discs 11, wherein, discs 11 places on the rotating disc 14, by 12 driven in rotation of a spindle motor, removable bare headed 13 then produce a light source, generation one drops on the luminous point on discs 11 surfaces behind this light-resource fousing, can read the information on the discs 11 after reflection.Ideally, when discs 11 during by 12 driven in rotation of spindle motor, the shaven head formed optical track marks 31 of 13 luminous points that produced (beam locus) just in time drop on the data-track 112, to read the information on the discs 11, yet, in fact because the making of discs 11 is bad, rotating disc 14 not just, and the skew of spindle motor 12, as shown in Figure 3, the center of circle 111 ' of the center of circle 111 of data-track 112 that can cause discs 11 during with rotation be not on same point, produced so-called eccentric distance (Radial runout), this causes the skew of formed optical track mark 31 of luminous point and data-track 112.
Correctly read the information of discs 11 with the adjustment CD-ROM drive for the size that detects eccentric distance, be to utilize to seek rail error signal (Tracking Error traditionally, TE), calculate during a predetermined revolution number, data-track that focal spot is crossed over 112 strides the rail number on the discs 11.Fig. 4 A is depicted as the synoptic diagram that an optical track mark 31 is crossed over several data-tracks 112, observe as can be known by figure, when eccentric rail number is about discs 11 and rotates a circle, half of data-track 112 numbers that optical track mark 31 is crossed over, based on this, Fig. 4 B calculates the process flow diagram of eccentric distance for it, and it is mainly when all numbers are scheduled in discs 11 rotations, data-track 112 numbers that calculate 31 leaps of optical track mark are counted ÷ (2 * predetermined revolution number) to obtain eccentric rail number for striding rail, learn eccentric distance in view of the above.
The known technology of aforementioned detection eccentric distance must be known predetermined revolution number, so the spindle motor that known technology adopted is necessary for three phase electric machine, wherein, three phase electric machine generally is equipped with a Hall subassembly (Hall Sensor), it is used for detecting with respect to changeing signal (FG signal) frequently, just can obtain the revolution number whereby.Yet, because the driver of three phase electric machine and collocation thereof costs an arm and a leg, in order to continue to reduce production costs, the general single-phase DC motor of a large amount of uses of the spindle motor of general slow-speed of revolution optical disk system, not having the FG signal can reference, thereby can't obtain predetermined revolution number, this causes eccentric distance can't utilize known technology to detect learning.
Summary of the invention
The purpose of this invention is to provide a kind of method and device that eccentric degree in the CD-ROM drive detects that be applied to, it can still can correctly detect eccentric distance when need not to use three phase electric machine to obtain revolution and count by reference FG signal.
According to one aspect of the present invention, the invention provides a kind of method that eccentric degree detects in the CD-ROM drive that is applied to, wherein, this CD-ROM drive produces luminous point with a shaven head and forms an optical track mark to read a plurality of data-track institute canned data on the discs on a discs, and the method comprising the steps of: (A) set one with optical track mark at present be the reference locus of M (M is a positive integer) at a distance of the rail number; (B) set predetermined minimum and count M_MIN, maximal phase at a distance of rail and count M_MAX, and detection time apart from rail, and in this detection time execution in step (C)～(E); (C) on judging discs with this optical track mark hand over data-track more with respect to this optical track mark when moving toward this reference locus direction, increase progressively and should count M at a distance of rail, otherwise successively decrease this apart rail count M; (D) count M when this at a distance of rail and count M_MIN at a distance of rail, should minimum count M_MIN and be set at apart rail and count M at a distance of rail less than this minimum; (E) count M and count M_MAX apart from rail at a distance of rail when this, this maximal phase is counted M_MAX apart from rail be set at apart rail and count M greater than this maximal phase; And (F) calculate eccentric rail number and count M_MAX for this maximal phase apart from rail and deduct this minimum and count M_MIN at a distance of rail.
According to another aspect of the present invention, the invention provides a CD-ROM drive, The built-in has the software program of the eccentric degree of the discs in the detection CD-ROM drive, this CD-ROM drive produces luminous point with a shaven head and forms an optical track mark to read a plurality of data-track institute canned data on the discs on this discs, and this program comprises following execution in step: (A) set one with optical track mark at present be the reference locus of M (M is a positive integer) at a distance of the rail number; (B) set predetermined minimum and count M_MIN, maximal phase at a distance of rail and count M_MAX, and detection time apart from rail, and in this detection time execution in step (C)～(E); (C) on judging discs with this optical track mark hand over data-track more with respect to this optical track mark when moving toward this reference locus direction, increase progressively and should count M at a distance of rail, otherwise successively decrease this apart rail count M; (D) count M when this at a distance of rail and count M_MIN at a distance of rail, should minimum count M_MIN and be set at apart rail and count M at a distance of rail less than this minimum; (E) count M and count M_MAX apart from rail at a distance of rail when this, this maximal phase is counted M_MAX apart from rail be set at apart rail and count M greater than this maximal phase; And (F) calculate eccentric rail number and count M_MAX for this maximal phase apart from rail and deduct this minimum and count M_MIN at a distance of rail.
According to one side more of the present invention, the invention provides a kind of computer-readable medium storing, it is loaded with a software program, and be applied in the CD-ROM drive to detect the eccentric degree of discs, wherein, this CD-ROM drive produces luminous point with a shaven head and forms an optical track mark to read most data-track institute canned data on the discs on this discs, and above-mentioned software program mainly comprises: first program code, be used for setting one with optical track mark at present be the reference locus of M (M is a positive integer) at a distance of the rail number; Second program code is used for setting predetermined minimum and counts M_MIN, maximal phase at a distance of rail and count M_MAX, and detection time apart from rail, and carries out third and fourth and five program codes in this detection time; The 3rd program code, on judging discs with this optical track mark hand over data-track more with respect to this optical track mark when moving toward this reference locus direction, increase progressively and should count M at a distance of rail, otherwise successively decrease this apart rail count M; Quadruple pass preface code is counted M when this at a distance of rail and is counted M_MIN less than this minimum at a distance of rail, should minimum counts M_MIN at a distance of rail and is set at apart rail and counts M; The 5th program code when this is counted M and count M_MAX greater than this maximal phase apart from rail at a distance of rail, is counted M_MAX with this maximal phase apart from rail and is set at apart rail and counts M; And the 6th program code, be used for calculating eccentric rail number and count M_MAX for this maximal phase apart from rail and deduct this minimum and count M_MIN at a distance of rail.
Description of drawings
Fig. 1 is the synoptic diagram of a discs canned data.
Fig. 2 is for reading the synoptic diagram of the information on the discs with a CD-ROM drive.
The eccentric distance of Fig. 3 for being produced on the display light disc.
Fig. 4 A crosses over the synoptic diagram of several data-tracks for the optical track mark.
Fig. 4 B is the process flow diagram of known calculating eccentric distance.
Fig. 5 is the synoptic diagram according to the eccentric degree of discs of the present invention.
Fig. 6 A is for crossing over the synoptic diagram of several data-tracks according to optical track mark of the present invention.
Fig. 6 B is for calculating the process flow diagram of eccentric distance according to the present invention.
Fig. 7 strides the judgement of rail direction for explanation.
[primary clustering symbol description]
Data-track 112 rotating discs 14
Step SS601～S609 crossover point A, B
Eccentric distance D
Embodiment
Relevant method and the device that eccentric degree detects in the CD-ROM drive that be applied to of the present invention, please be earlier with reference to the synoptic diagram of the eccentric degree of a discs 11 shown in Figure 5, wherein, solid line circle expression data-track 112, and broken circle is represented optical track mark 31, and there is an eccentric distance D in the center of circle 111 ' of the center of circle 111 of data-track 112 and optical track mark 31 (that is center of circle of CD 11 rotations) not on same point, in addition, in the present invention, define a reference locus 51, this reference locus 51 is for being positioned at any distance with the optical track mark 31 same centers of circle 111 '.
In order to detect the size of eccentric distance D, be the synoptic diagram that an optical track mark 31 is crossed over several data-tracks 112 as shown in Figure 6A, Fig. 6 B calculates the process flow diagram of eccentric distance for it, shown in process flow diagram, it at first sets reference locus 51 (step S601) in a precalculated position, this reference locus 51 produces the formed optical track mark 31 of luminous point at a distance of M rail (M is a positive integer) with present shaven head, secondly, set predetermined minimum and count M_MIN at a distance of rail, maximal phase is counted M_MAX apart from rail, and T detection time (step S602), wherein, minimum count M_MIN and maximal phase at a distance of rail and count M_MAX apart from rail and can be initialized as and equal M (or other appropriate value), and should detection time T for to rotate a circle the required time greater than discs 11.Afterwards, judge on the discs 11 and whether move (step 603) to increase progressively M value (step 604) or the M value (step 605) of successively decreasing with respect to optical track mark 31 toward reference locus 51 directions with the data-track 112 more of optical track mark 31 friendships at present, wherein, the general rail direction determining mode of striding is to utilize to seek rail error signal (Tracking Error, TE) with radio frequency ripple signal (Radio Frequency Ripple Signal, RFRP) phase relation between is judged, utilize this phase relation just can on discs 11, do the location of outgoing direction position, example for example shown in Figure 7, seek rail error zero cross signal (Tracking Error Zero Cross, TEZC) with radio frequency ripple zero cross signal (RadioFrequency Ripple Zero Cross, RFZC) be the digital signal of TE and RFRP respectively, when TEZC phase-lead RFZC, then data-track 112 is moving of forward with respect to optical track mark 31; Otherwise when TEZC phase lag RFZC, then data-track 112 is reverse moving with respect to optical track mark 31.Therefore, please refer to again shown in Fig. 6 A, because eccentric cause, optical track mark 31 will be handed over more with data-track 112, when crossover point A, data-track 112 is toward moving with reference to rail 51 directions, represent optical track mark 31 and, therefore the M value is increased progressively (M=M+1) with reference to the data-track number increase that exists between the rail 51, and when crossover point B, data-track 112 is to move away from reference rail 51 directions, represent optical track mark 31 and, therefore the M value is successively decreased (M=M-1), in view of the above with reference to the data-track decreased number that exists between the rail 51, dynamically recording disk sheet 11 when rotated, optical track mark 31 and with reference to the data-track number that exists between the rail 51.
Afterwards, with T detection time successively decrease (step S606), and when detection time, T did not finish as yet, judge that whether the M value is less than the M_MIN value, in this way, the M_MIN value is set at M value (step 607), otherwise judge that the M value whether greater than the M_MAX value, in this way, is set at M value (step 608) with the M_MAX value, in view of the above, can obtain optical track mark 31 and with reference to existing between the rail 51 at most and minimum data-track numbers.When the test duration does not finish, repeating step S603～S608, last, after the test duration finished, can calculate eccentric rail number was that the M_MAX value deducts M_MIN value (step S609).
By above explanation as can be known, the present invention seeks the quantity that relative difference that the rail error produces obtains eccentric orbit for utilizing when off-centre, this number of tracks is multiplied by the actual eccentric distance D that the orbital distance of discs can obtain to cause on the eccentric CD again.Therefore, it need not to use three phase electric machine to obtain the revolution number with reference to the FG signal, and when adopting general single-phase DC motor, still can correctly detect eccentric distance, as long as and can detect eccentric degree after finishing " focusing " action, not only make the performance of CD-ROM drive obtain preferable degree of stability, also significantly reduce the production cost of CD-ROM drive.
And the above-mentioned execution in step of the present invention can be write as so that be executed in the CD-ROM drive by computerese, and the software program that this is write as can be stored in any microprocessing unit can identification, the programmed recording medium of deciphering, or include the article and the device of this programmed recording medium.It is not limited to any form, and these article can be hard disk, floppy disk, CD, ZIP, MO, IC chip, random access memory (RAM), or any those who are familiar with this art the spendable article that include this programmed recording medium.Since of the present invention be applied to method that eccentric degree in the CD-ROM drive detects disclosed complete as before, any familiar with computers language speaker reads instructions of the present invention and promptly knows how to write software program, so relevant software program detail section is not given unnecessary details at this.
The foregoing description is only given an example for convenience of description, and the interest field that the present invention advocated should require described being as the criterion with patent certainly, but not only limits to the foregoing description.
Claims (4)
1. one kind is applied to the method that eccentric degree in the CD-ROM drive detects, and wherein, this CD-ROM drive produces luminous point with a shaven head and forms an optical track mark to read a plurality of data-track institute canned data on the discs on a discs, and the method comprising the steps of:
(A) setting one is the reference locus of M with present optical track mark at a distance of the rail number, and wherein, M is a positive integer;
(B) apart rail is counted M_MIN, maximal phase is counted M_MAX, reached detection time apart from rail to set predetermined minimum, and execution in step in this detection time (C)～(E), wherein, this minimum at a distance of rail count M_MIN and maximal phase apart from rail count M_MAX be initialized to this apart rail count M, this detection time is for to rotate a circle the required time greater than this discs;
(C) on judging discs with this optical track mark hand over data-track more with respect to this optical track mark when moving toward this reference locus direction, increase progressively and should count M at a distance of rail, otherwise successively decrease this apart rail count M;
(D) count M when this at a distance of rail and count M_MIN at a distance of rail, should minimum count M_MIN and be set at apart rail and count M at a distance of rail less than this minimum;
(E) count M and count M_MAX apart from rail at a distance of rail when this, this maximal phase is counted M_MAX apart from rail be set at apart rail and count M greater than this maximal phase; And
(F) calculating eccentric rail number counts M_MAX for this maximal phase apart from rail and deducts this minimum and count M_MIN at a distance of rail; And
(G) calculating eccentric distance is the orbital distance that eccentric rail number is multiplied by discs.
2. the method for claim 1, wherein in step (C), judge that whether this data-track moves toward this reference locus direction, is to use the phase relation of seeking between rail error zero cross signal and the radio frequency ripple zero cross signal to reach.
3. method as claimed in claim 2 wherein, when this seeks this radio frequency ripple zero cross signal of phase-lead of rail error zero cross signal, judges that this data-track is moving of forward with respect to this optical track mark.
4. method as claimed in claim 2 wherein, when this seeks this radio frequency ripple zero cross signal of phase lag of rail error zero cross signal, judges that this data-track is reverse moving with respect to this optical track mark.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100730861A CN100354952C (en) | 2005-05-30 | 2005-05-30 | Method and device for testing eccentricity degree in optical drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100730861A CN100354952C (en) | 2005-05-30 | 2005-05-30 | Method and device for testing eccentricity degree in optical drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1873796A CN1873796A (en) | 2006-12-06 |
| CN100354952C true CN100354952C (en) | 2007-12-12 |
Family
ID=37484233
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100730861A Expired - Fee Related CN100354952C (en) | 2005-05-30 | 2005-05-30 | Method and device for testing eccentricity degree in optical drive |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100354952C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115906A (en) * | 1993-09-28 | 1996-01-31 | 索尼公司 | Disc eccentricity measuring apparatus and method thereof and apparatus for recording and/or reproducing disc-shaped recording medium |
| CN1542780A (en) * | 2003-04-28 | 2004-11-03 | ���µ�����ҵ��ʽ���� | Information carrier apparatus and information carrier eccentricity correction method |
-
2005
- 2005-05-30 CN CNB2005100730861A patent/CN100354952C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1115906A (en) * | 1993-09-28 | 1996-01-31 | 索尼公司 | Disc eccentricity measuring apparatus and method thereof and apparatus for recording and/or reproducing disc-shaped recording medium |
| CN1542780A (en) * | 2003-04-28 | 2004-11-03 | ���µ�����ҵ��ʽ���� | Information carrier apparatus and information carrier eccentricity correction method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1873796A (en) | 2006-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1971714B (en) | Method of writing a reference servo signal of hard disk drive and apparatus suitable therefor | |
| US7019937B1 (en) | Method and apparatus for determining a transducer's reference position in a disk drive having a disk surface with spiral servo information written thereon | |
| US20050117240A1 (en) | Method of manufacturing and disk drive produced by measuring the read and write widths and varying the track pitch in the servo-writer | |
| US20020050814A1 (en) | Testing apparatus and method for testing magnetic head and/or magnetic disk | |
| CN101471084A (en) | Disk drive device and head positioning control method | |
| US7460330B2 (en) | Settling judgment method for positioning control device and positioning control device | |
| CN100429718C (en) | Head position control method and disc device | |
| JP3253535B2 (en) | Head positioning control device for disk device and magnetic disk device | |
| EP0463820A2 (en) | Disk drive apparatus and a seek method for spiral tracks | |
| CN1862669B (en) | Recording method for optical disc device | |
| CN100354952C (en) | Method and device for testing eccentricity degree in optical drive | |
| CN101067939B (en) | System and method for detecting the location of an optical pick-up head | |
| US7605998B2 (en) | Settling judgment method for positioning control device, positioning control device and disk apparatus | |
| US7505386B2 (en) | Radial runout detection method and device for an optical disk drive | |
| JP2008210451A (en) | Method and device for detecting eccentricity of discrete track medium | |
| JP3986870B2 (en) | Optical pickup feed control method and apparatus | |
| JPWO2009028014A1 (en) | Disk device manufacturing method, storage disk servo information writing method, and disk device | |
| US7433147B2 (en) | Position control device, disk device, and position control method | |
| US20060002265A1 (en) | Optical disc device | |
| JPS6355787A (en) | Head position control device for magnetic disk system | |
| US8189441B2 (en) | Method of recognizing track pitch of optical disk | |
| JP3670259B2 (en) | Data writing method to optical disc and optical disc apparatus | |
| KR100261078B1 (en) | Method of controlling head position of hdd servolighter | |
| JP2004127495A (en) | Hard magnetic disk or method for testing magnetic head | |
| CN101295518B (en) | Apparatus of compact disc |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071212 Termination date: 20170530 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |