CN102930885A - Label surface positioning method of optical disc - Google Patents
Label surface positioning method of optical disc Download PDFInfo
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- CN102930885A CN102930885A CN2011102308579A CN201110230857A CN102930885A CN 102930885 A CN102930885 A CN 102930885A CN 2011102308579 A CN2011102308579 A CN 2011102308579A CN 201110230857 A CN201110230857 A CN 201110230857A CN 102930885 A CN102930885 A CN 102930885A
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- disc
- radius
- label surface
- read head
- optical read
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Abstract
The invention discloses a label surface positioning method of an optical disc. The label surface positioning method of the optical disc comprises the steps of: moving an optical read head on a data surface from a mechanical original point to a preset moving radius; reading an address serial number of address information, and substituting a positioning formula and calculating the actual moving radius; subtracting the preset moving radius by the actual moving radius, and calculating the moving error; comparing the actual moving radius with the preset moving radius, and determining the compensation direction of a moving optical read head; moving the optical read head from the mechanism original point to the preset moving radius on the label surface of the optical disc; and compensating the moving error according to the determined compensation direction so as to complete the label surface positioning.
Description
Technical field
The present invention relates to a kind of CD player, particularly relate to the optical read head in the CD player, at the localization method of disc label surface.
Background technology
Because the label surface of disc does not arrange track bar or address etc., guide optical read head running fix, optical read head must by other running fix modes, could be drawn correct pattern in label surface.
As shown in Figure 1, be the synoptic diagram of prior art disc label surface.The label surface 11 of disc 10, specification according to label surface, at center setting operation characteristic area (Control Feature Zone) 12, the interior ring (Inner Ring) 14 that comprises outer shroud (Outer Ring) 13 and be provided with 400 width of cloth silks (Spoke).Outer shroud 13 provides the relevant information pattern of disc label surface 10, such as: the mark sections such as media ID (Media ID Field), sawtooth pattern (saw-tooth) and index marker (index mark).Wherein the sawtooth pattern information pattern provides the radial location of label surface that the angle orientation reference of label surface then is provided with reference to the width of cloth silk of interior ring 14.
As shown in Figure 2, be the synoptic diagram of the radial location of sawtooth pattern information pattern.When optical read head read the sawtooth pattern information pattern, disc was with rotation direction R rotation, and the optical read head light beam is incident upon on arbitrary line L of operation characteristic zone.Because the light reflectivity of information pattern is higher, when the light beam F of optical read head projection touched the sawtooth pattern information pattern, the high signal that can occur reading was until the leave message pattern will produce the low signal that reads.According to the specifications regulation of disc label surface, the benchmark first rail position I of label surface is 23.8 μ m apart from the center of circle, and the vertex distance center of circle of sawtooth pattern information pattern is 21.8 μ m, and the height of sawtooth pattern information pattern is 0.65 μ m, and end length is b.By the high signal length a that reads, can utilize following formula (1) to calculate optical read head by the position movement of the present line L length X that moves radially to the benchmark first rail position I of label surface:
X＝(23.8-21.8)+0.65*[a/b] (1)
Move the distance that moves a step by optical read head again, calculate that optical read head moves required step number, make optical read head move to the location of benchmark the first rail position I, with correct drafting label.
Yet, optical read head must move to ability reading information pattern signal in the operation characteristic zone, the signal of disc label surface is relatively poor, and the sawtooth pattern information pattern is vulnerable to scratch, and cause the mistake that reads high signal length or low signal length, add that optical read head moves the distance that moves a step error is also arranged, all can affect optical read head in the degree of accuracy that disc label surface radial direction moves, cause accurately to arrive benchmark the first rail position and draw label.Therefore the prior art optical read head still has problem to need to be resolved hurrily on the method that the disc label surface is located.
Summary of the invention
Purpose of the present invention is providing a kind of disc label surface localization method, utilizes the location general formula to convert the address sequence number of track bar to apart from the disc center of circle radius, replaces the sawtooth pattern information pattern, with the displacement error of calibrating optical read head.
Another object of the present invention is in that a kind of disc label surface localization method is provided, and by compensation quotient and the remainder of displacement error, mobile optical read head and fine setting object lens are with the quality of improving optical read head in disc label surface location.
In order to reach the purpose of aforementioned invention, disc label surface localization method of the present invention moves to a predetermined mobile radius with optical read head by mechanism's initial point at the data surface of disc; Reading address information, wherein address sequence number substitution one location general formula calculates actual mobile radius; Subtract predetermined mobile radius by the mobile radius of reality, calculate displacement error, and with displacement error divided by default step pitch, obtain to compensate quotient and remainder; Actual mobile radius and predetermined mobile radius, the compensation direction of decision mobile optical read head; In the disc label surface, optical read head is moved to predetermined mobile radius by mechanism's initial point; According to the compensation direction that determines, the mobile optical read head should compensate the step number of quotient, finely tuned this compensation remainder step of object lens, to finish the location again.
The mobile radius R of reality of the present invention, by this address sequence number A that reads, substitution utilizes the reference point of a known proportion constant f, known distance disc center of circle radius R s and address sequence number As, the width w of known optical disc sheet track bar, formed location general formula R=[Rs
2-(As-A) * w * f/ π]
1/2Calculate gained.For the radius of reference point during not greater than predetermined mobile radius one preset distance, this address sequence number A that need will read and the address sequence number As of this reference point are relatively, address sequence number A is during less than base address sequence number As, select aforementioned location general formula, and address sequence number A is during greater than base address sequence number As, then regioselective general formula R=[Rs
2+ (A-As) * w * f/ π]
1/2, calculate the mobile radius R of this reality.
Description of drawings
Fig. 1 is the synoptic diagram of prior art disc label surface.
Fig. 2 is the synoptic diagram of sawtooth pattern information pattern radial location.
Fig. 3 is the synoptic diagram that the present invention calculates proportionality constant f.
Fig. 4 is that the present invention is at disc data surface positioning correcting synoptic diagram.
Fig. 5 is regioselective general formula synoptic diagram.
Fig. 6 is that the present invention is at the location of label surface synoptic diagram.
Fig. 7 is the process flow diagram of disc label surface localization method of the present invention.
The reference numeral explanation
10 discs
11 label surface
12 operation characteristic zone
13 outer shrouds
14 interior rings
20 optical read heads
21 data surfaces
22 track bars
23 Spindle Motors
24 mechanism's initial points
25 label surface
Embodiment
Relevant the present invention for achieving the above object, the technological means that adopts and effect thereof hereby lift preferred embodiment, and accompanying drawings are as follows.
Please refer to Fig. 3 and Fig. 4, Fig. 3 is the synoptic diagram that the present invention calculates proportionality constant f, and Fig. 4 is that optical read head of the present invention is at disc data surface positioning correcting synoptic diagram.Because the disc label surface there is no track bar for optical read head 20 location, so the present invention positions correction at 21 pairs of optical read heads 20 of disc data surface first.Specification according to disc, data surface 21 centers on the track bar 22 of fixed width w to the outer ring from inner ring, divide a plurality of block along track bar 22, each block indicates address (Address), the address includes block place track bar 22 address sequence number sequentially, but only indicates the radius apart from disc center of circle O in special several addresses.Take the DVD-ROM disc as example, the width w of track bar is 0.74 μ m, the address sequence number A1 of some B1 address 0x2A480 track bar is 173184, corresponding position is 23400 μ m far from the radius R 1 of center of circle O, and the address sequence number A2 of some B2 address 0x30000 track bar is 196608, and corresponding position is 24000 μ m far from the radius R 2 of center of circle O.Because data surface 21 is not each address all indicates radius apart from disc center of circle O, the address information that can't indicate according to data surface 21, the directly distance of calibrating optical read head 20 walkings.
As shown in Figure 3, therefore the present invention at first allows optical read head 20 known wantonly 2 movements apart from center of circle O radius on disc data surface 21, be that the B1 point of R1 moves to apart from disc center of circle O by distance disc center of circle O for example be the B2 point of R2, annular area inswept on disc data surface 21 can be considered: π * (R2
2-R1
2); To surround around disc center of circle O with track bar 22 because of disc data surface 21 in addition, be considered as representative data rail length such as the address address sequence number that track bar is sequentially indicated, optical read head 20 is ordered the area that surrounds from the B1 point of track bar address sequence number A1 to the B2 of address sequence number A2, also can be considered by a track bar width w and the formed strip area of address sequence number (A2-A1); Therefore there is a proportionality constant f between annular area and the strip area, such as following formula (2),
π×(R2
2-R1
2)＝(A2-A1)×w×f (2)
Can obtain proportionality constant
f＝[π×(R2
2-R1
2)]/[(A2-A1)×w] (3)
For example utilize R1, R2, A1, A2 and the w substitution formula (3) of aforementioned DVD-ROM disc point B1 and B2 known address information, but then address acquisition sequence number conversion apart from the proportionality constant f=5154.5017 of center of circle O radius.The CD disc also can be according to obtaining proportionality constant f.
As shown in Figure 4, the reference point Bs of proportion of utilization constant f and a known distance center of circle O radius R s and address sequence number As.Move to the some B of any position for optical read head 20 at data surface 21, by its address sequence number A substitution formula (2), just can obtain a B apart from the first location general formula (4) of center of circle O radius R,
R＝[Rs
2-(As-A)×w×f/π]
1/2 (4)
And can by the contained address sequence number A in transfer point B location, calculate fast the radius R of relative distance center of circle O.
Therefore, to optical read head 20 at data surface 21 running fix timings, because the periphery of the radius R 0 of Spindle Motor 23 is end points that restriction optical read head 20 moves at the disc inner ring, and mechanism's initial point 24 that formation optical read head 20 moves, when optical read head 20 moves preset distance D from mechanism's initial point 24 to the disc outer ring, divided by the step pitch d that optical read head 20 is preset, be exactly the step number N=D/d that optical read head 20 should be walked.After preset distance D adds the radius R 0 of Spindle Motor 23, equal optical read head 20 predetermined mobile radius D+R0.Behind optical read head 20 walking step number N, read the address sequence number A of loca B, general formula (4) is located in substitution first, can obtain the actual mobile radius R of a B.Actual mobile radius R and predetermined mobile radius D+R0, just can be regarded as out the displacement error Δ D of optical read head 20, actual mobile radius R is greater than predetermined mobile radius D+R0, optical read head 20 needs to compensate correction to disc inner ring displacement error Δ D, and actual mobile radius R is less than predetermined mobile radius D+R0, and optical read head 20 is continuous to compensate correction to disc outer ring displacement error Δ D.
As shown in Figure 5, be regioselective general formula synoptic diagram.The point B that aforementioned optical read head 20 moves is less than reference point Bs, and is identical with the relative position of derive the first location general formula (4) used some B1, B2, from applicable the first location general formula (4).But the some B ' that moves when optical read head 20 is opposite with the relative position of derive the first location general formula (4) used some B1, B2 greater than reference point Bs, and the first location general formula (4) is from being suitable for.First sign symbol of locating general formula (4) of should considering to derive changes, and locates general formula (5) to derive second,
R＝[Rs
2+(A-As)×w×f/π]
1/2 (5)
Therefore for simplifying correction program, answer the radius of selection reference point Bs greater than predetermined mobile radius one preset distance, what for example proofread and correct is that benchmark the first gauge that optical read head 20 moves to label surface is 23.8 μ m from the center of circle, just should select greater than the reference point Bs of benchmark the first gauge from center of circle preset distance.Otherwise the reference point Bs that selects near benchmark first rail of label surface apart from the time, just need will read the address sequence number A of loca B and the address sequence number As of reference point Bs compares, address sequence number A is during less than base address sequence number As, select the first location general formula (4), and address sequence number A is during greater than base address sequence number As, then select the second location general formula (5), to calculate the radius R of relative distance center of circle O.
As shown in Figure 6, for the present invention at the location of label surface synoptic diagram.The present invention moves preset distance D with optical read head 20 and adds that it is 23.8 μ m apart from the center of circle that Spindle Motor 23 radius Rs 0 are made as benchmark the first rail I that moves to label surface when label surface 25 location.Preset distance D is divided by the default step pitch d of optical read head 20, and optical read head 20 moves to benchmark the first rail I N=D/d step number of need walking from mechanism's initial point 24.According to the correction at data surface, mobile preset distance D produces displacement error Δ D, divided by the default step pitch d of optical read head 20, obtain compensation quotient K1 and a remainder K2, and according to comparing in the size of the actual mobile radius of data surface with predetermined mobile radius D+R0, determine that optical read head 20 needs to compensate to disc inner ring or outer ring displacement error Δ D.After arriving actual mobile radius R 0+N * d, move the 20 compensation quotient K1 steps of optical read head during compensation, then to the less than compensation remainder K2 in one step, finely tune mobile object lens 25 remainder K2 step pitches from, benchmark the first rail I that makes optical read head 20 move to label surface is 23.8 μ m apart from the center of circle, reaches origin reference location.
Please refer to Fig. 7, be the process flow diagram of disc label surface localization method of the present invention.At first at step S1, begin to carry out correction program at the data surface of disc; Then enter step S2, optical read head moves to predetermined mobile radius by mechanism's initial point; At step S3, reading address information, wherein address sequence number substitution location general formula calculates actual mobile radius; In step S4, the mobile radius of reality is subtracted predetermined mobile radius, calculate displacement error, and with displacement error divided by default step pitch, obtain to compensate quotient and remainder; Then enter step S5, is actual mobile radius greater than predetermined mobile radius? to determine optical read head compensation moving direction, if actual mobile radius is greater than predetermined mobile radius, then determine to disc inner ring mobile optical read head compensation direction to step S6, if actual mobile radius is not more than predetermined mobile radius, then determine to disc outer ring mobile optical read head compensation direction to step S7.After determining compensation direction, enter again step S8, in the disc label surface, optical read head is moved to predetermined mobile radius by mechanism's initial point; In step S9, according to entering at last step S10, make the radius of optical read head arrival label surface, to finish the location.
The flow process of aforementioned disc label surface localization method of the present invention can will be scheduled to benchmark the first gauge that mobile radius is made as label surface from 23.8 μ m, and benchmark first rail that then can make optical read head correctly move to label surface arrives the origin reference location of drawing label design.The present invention also can will be scheduled to mobile radius and be made as the distance of label surface sawtooth pattern information pattern mid point, optical read head is moved to the center of information pattern on the disc label surface, to promote the correctness of reading information.
Therefore, by aforementioned disc label surface localization method of the present invention, can convert the address sequence number of track bar to apart from the disc center of circle radius by the location general formula, first at the displacement error of data surface calibrating optical read head, reach the purpose that replaces the sawtooth pattern information pattern.In addition, the present invention also can utilize displacement error divided by the step pitch of optical read head, the compensation quotient and the remainder that obtain, at the optical read head of label surface to mobile predetermined mobile radius, with mobile optical read head and fine setting object lens, carry out direct compensation, reach the improving optical read head in disc label surface location and the quality that draws a design.
The above person, only in order to convenient explanation preferred embodiment of the present invention, scope of the present invention is not limited to described preferred embodiment, and all any changes of doing according to the present invention without departing from the spirit of the present invention, all belong to the scope of claim of the present invention.
Claims (7)
1. disc label surface localization method, its step comprises:
(1) data surface at disc moves to a predetermined mobile radius with optical read head by mechanism's initial point;
(2) reading address information, wherein address sequence number substitution one location general formula calculates actual mobile radius;
(3) the mobile radius of reality is subtracted predetermined mobile radius, calculates displacement error, and with displacement error divided by default step pitch, obtain to compensate quotient and remainder;
(4) actual mobile radius determines to disc inner ring mobile optical read head compensation direction greater than predetermined mobile radius, when actual mobile radius is not more than predetermined mobile radius, then determines to disc outer ring mobile optical read head compensation direction;
(5) in the disc label surface, optical read head is moved to this predetermined mobile radius by mechanism's initial point; And
(6) according to the compensation direction of this decision, the mobile optical read head should compensate the step number of quotient, finely tuned this compensation remainder step of object lens, to finish the location again.
2. disc label surface localization method as claimed in claim 1, wherein should the mobile radius R of reality, by this address sequence number A that reads, substitution utilizes the reference point of a known proportion constant f, known distance disc center of circle radius R s and address sequence number As, and the formed following general formula of should locating calculates gained: by
R＝[Rs
2-(As-A)×w×f/π]
1/2
Wherein w is the width of disc track bar.
3. disc label surface localization method as claimed in claim 2, wherein this proportionality constant f utilizes known wantonly 2 points apart from disc center of circle radius R 1 and R2, address sequence number A1 and A2 on the disc data surface, and mobile ring-type and the following relationship of track bar area are tried to achieve therebetween:
f＝[π×(R2
2-R1
2)]/[(A2-A1)×w]。
4. disc label surface localization method as claimed in claim 3, wherein this proportionality constant f of DVD-ROM disc is 5154.5017.
5. disc label surface localization method as claimed in claim 2, when wherein the radius of this reference point is not greater than predetermined mobile radius one preset distance, with the address sequence number As of this address sequence number A of reading and this reference point relatively, address sequence number A is during less than base address sequence number As, select this location general formula, and address sequence number A is during greater than base address sequence number As, then the regioselective general formula:
R＝[Rs
2+(A-As)×w×f/π]
1/2
Calculate the mobile radius R of this reality.
6. disc label surface localization method as claimed in claim 1, benchmark the first gauge that wherein should predetermined mobile radius be made as label surface from, make optical read head move to label surface benchmark the first rail.
7. disc label surface localization method as claimed in claim 1 wherein should be scheduled to the distance that mobile radius is made as label surface sawtooth pattern information pattern mid point.
Priority Applications (1)
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|---|---|---|---|
| CN2011102308579A CN102930885A (en) | 2011-08-12 | 2011-08-12 | Label surface positioning method of optical disc |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102308579A CN102930885A (en) | 2011-08-12 | 2011-08-12 | Label surface positioning method of optical disc |
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| CN102930885A true CN102930885A (en) | 2013-02-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108272354A (en) * | 2018-01-26 | 2018-07-13 | 武汉智味来创新科技股份有限公司 | A kind of method that pot body is automatically positioned in automatic dish cooking machine |
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| JP2006123583A (en) * | 2004-10-26 | 2006-05-18 | Mazda Motor Corp | Seat device for vehicle |
| CN1855241A (en) * | 2005-04-26 | 2006-11-01 | 日立-Lg数据存储韩国公司 | Method for reading media information from optical recording media |
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Application publication date: 20130213 |