CN1658312A - Method for distinguishing optical disk form - Google Patents
Method for distinguishing optical disk form Download PDFInfo
- Publication number
- CN1658312A CN1658312A CN 200410005239 CN200410005239A CN1658312A CN 1658312 A CN1658312 A CN 1658312A CN 200410005239 CN200410005239 CN 200410005239 CN 200410005239 A CN200410005239 A CN 200410005239A CN 1658312 A CN1658312 A CN 1658312A
- Authority
- CN
- China
- Prior art keywords
- pull signal
- beam push
- signal
- push
- light beam
- 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
This invention discloses a method for distinguishing CD's format, and is applied to the optical storage device with three-beam read head. Overlap the main beam push-pull signal received by the optical sensor of the read head and the sub-beam push-pull signal to get the push-pull adding signal, subtract the main beam push-pull signal and the sub-beam push-pull signal to get the push-pull discrepancy signal. If the peak-to-peak voltage of the push-pull discrepancy signal is more than that of the push-pull add signal, assure the optical point formed by the sub beam of the three beams to fall on the border-upon smooth areas of the internal CD of the optical storage device, and the main beam on the furrow of the internal CD. If the peak-to-peak voltage of the push-pull discrepancy signal is less than that of the push-pull add signal, judge that the optical points formed by the sub and the main beams to fall in the three furrows of the CD separately.
Description
Technical field
The invention relates to a kind of method of discriminating disk mode, particularly about utilizing optical storage read head (Pick-Up Head; PUH) relativeness after push-pull signal (push-pull signal) is synthetic is come discriminating disk mode.
Background technology
Along with improving constantly of Information technology technology, the mode of storage data is also increasing, and wherein optical storage has just like become the main tool of storage data on the market.The working method of optical storage is to drive read head by drive of motor device (electromechanical actuator), laser spots is suitably focused on the CD, judge according to the light power that reflexes to optical sensor (photo-detector) then and read the binary data of being stored.This reflected light is simultaneously also as the servo-control signal that drives read head, for example: tracking error (Tracking Error; TE) signal and focusing error (Focus Error; FE) signal.That is utilize these optical signallings to drive read head, laser spots can correctly be focused on the predetermined groove.
Fig. 1 is the synoptic diagram of the optical system of read head in the optical storage.One laser beam 16 is by a laser diode (Laser Diode; LD) 11 produce, and be divided into leading time light beam (sub-beam) 16b, main beam (main beam) 16a and fall behind time light beam 16c totally three road light beams through phase grating (phase grating) 12.This three roads light beam can penetrate a spectroscope 13 and a condenser lens (objective lens) 14 again and arrive the inside of CD 80, and forms time luminous points 162, main spot 161 and time luminous point 163 at groove (groove) 81, flat region (land) 82 respectively.
One folded light beam of this three each self-formings of luminous point place, and through spectroscope 13 guiding one optical sensor 15, respectively by the main acceptance division 151 of optical sensor 15, the data that inferior acceptance division 152 and 153 receives different folded light beams.As shown in Figure 1.Each acceptance division is divided into two parts again, and wherein main acceptance division 151 comprises A and B two districts, and inferior acceptance division 152 comprises C and D district, and inferior acceptance division 153 comprises E and F district, therefore can obtain the composite signal of following definition:
MPP＝A-B；
SPP＝(C+E)-(D+F)；
Wherein MPP represents the main beam push-pull signal, SPP representative time light beam push-pull signal, the optical signalling that on behalf of each light receiving area, A～F read respectively.
Whether existing optical storage discriminating disk mode is that the mode of DVD-RAM (digital video disk-random access memory) is to utilize to recommend the method for differing (Differential Push-Pull; DPP), also soon the main beam push-pull signal deducts time light beam push-pull signal and obtains recommending phase difference signal, shown in the following column count formula:
DPP＝MPP-SPP＝(A-B)-{(C+E)-(D+F)}。
When the peak-to-peak value voltage of DPP signal during greater than a predetermined threshold value, just conclude that the disk format that is read at present is DVD-RAM, otherwise just classify as the DVD CD of other kind form, for example: DVD-ROM (ROM (read-only memory)), DVD-R (repeatable read is got) and DVD-RW (rewritable) etc.Yet, therefore set the form not a duck soup of single threshold value, even be difficult to guarantee judge accuracy of action at every turn to distinguish that DVD coils because the DVD CD of different-format can cause the conditioned reflex of light beam widely different.
Summary of the invention
The method that the purpose of this invention is to provide a kind of discriminating disk mode, the relative size according to main beam push-pull signal and time light beam push-pull signal after synthetic concerns to come discriminating disk mode, and that can effectively improve optical storage declares the sheet accuracy.
For achieving the above object, the present invention discloses a kind of method of discriminating disk mode, and it is applied to an optical storage with read head of three light beams.The resulting main beam push-pull signal of the optical sensor of this read head is obtained one with the stack of time light beam push-pull signal recommend sum signal, and this main beam push-pull signal and this time light beam push-pull signal subtracted each other obtain one and recommend phase difference signal.If this peak-to-peak value voltage of recommending phase difference signal is recommended the peak-to-peak value voltage of sum signal greater than this, then the inferior light beam of this three light beam of decidable and luminous point that main beam forms can drop on adjacent flat district and groove on the interior CD of this optical storage.If this peak-to-peak value voltage of recommending phase difference signal recommends the peak-to-peak value voltage of sum signal less than this, then this time of decidable light beam and luminous point that main beam forms can drop on respectively on this CD in three continuous grooves.
If this disk format is to be DVD-RAM, because the spacing of main spot and time luminous point can equal the spacing of its adjacent flat district and groove along the component of this disc radial direction, so this main spot and time luminous point can drop on adjacent flat district and groove central authorities on this CD, make this peak-to-peak value voltage of recommending phase difference signal recommend the peak-to-peak value voltage of sum signal greater than this.On the contrary, if the CD of other DVD form, because the spacing of this main spot and time luminous point can equal the spacing of its adjacent trenches along the component of this disc radial direction, so this main spot and time luminous point can drop on three continuous groove central authorities on this CD respectively, make this peak-to-peak value voltage of recommending phase difference signal recommend the peak-to-peak value voltage of sum signal less than this.
Description of drawings
Fig. 1 is the synoptic diagram of the optical system of read head in the optical storage;
Fig. 2 (a) is the oscillogram of the optical signalling of the present invention's DVD CD of handling non-RAM form;
Fig. 2 (b) is the oscillogram of the optical signalling of the present invention's DVD CD of handling the RAM form;
Fig. 3 is the process flow diagram of discriminating disk mode of the present invention.
Element numbers explanation among the figure:
| 11 laser diodes | 12 phase gratings |
| 13 spectroscopes | 14 focusing objective lens |
| 15 optical sensors | 151 main acceptance divisions |
| 152,153 acceptance divisions | 16 laser beam |
| The 16a main beam | The leading time light beam of 16b |
| 16c falls behind | 161 main spot |
| 162,163 | |
| 80 CDs | 80 ' DVD- |
| 81,81 | 82,82 ' |
| 83,83 record pits |
Embodiment
Fig. 2 (a) is the oscillogram of the optical signalling of the present invention's DVD CD of handling non-RAM form.CD 80 is DVD CDs of a non-RAM form, for example: DVD ± R, DVD ± RW and DVD-ROM, the record pit (pit) 83 of therefore storing data exists only in the groove 81, and the spacing d1 of adjacent two grooves 81 is approximately 0.74 μ m.Main spot 161 after the three light beam line focuses can drop on groove 81 central authorities, and the inferior luminous point of following 162 and 163 also drops on both sides adjacent grooves 81 central authorities respectively.This moment, the current potential of main beam push-pull signal MPP was at its cut-off level (slice level), and the current potential of inferior light beam push-pull signal SPP also can be in its cut-off level.
When read head was mobile slightly to the right, the current potential of this main beam push-pull signal and time light beam push-pull signal can be simultaneously cumulative; But if when mobile slightly left, then the current potential of main beam push-pull signal and time light beam push-pull signal also can successively decrease simultaneously.That is main beam push-pull signal and time light beam push-pull signal can have identical potential change along with the striding the rail action of read head.This main beam push-pull signal and this time light beam push-pull signal subtract each other and obtain one and recommend phase difference signal MPP-SPP.Clearly, main beam push-pull signal and time light beam push-pull signal are cancelled out each other because of the same-phase amplitude, therefore recommend the peak-to-peak value voltage V of phase difference signal
P-P D1Relatively diminish.Review, the main beam push-pull signal can obtain one with time light beam push-pull signal stack and recommend sum signal MPP+SPP, and this recommends the peak-to-peak value voltage V of sum signal shown in Fig. 2 (a)
P-P A1But can relatively become big.
Fig. 2 (b) is the oscillogram of the optical signalling of the present invention's DVD CD of handling the RAM form.CD 80 ' be the CD of a DVD-RAM form, therefore store the record pit 83 of data ' do not exist only in groove 81 ' interior also be present in simultaneously flat region 82 ', and adjacent trenches 81 ' and flat region 82 ' spacing d2 be approximately 0.714 μ m.Main spot 161 after the three identical light beam line focuses can drop on groove 81 ' central authorities, and the inferior luminous point of following 162 and 163 also drops on flat region 82 ' central authorities of both sides next-door neighbour respectively.This moment, the current potential of main beam push-pull signal MPP was at its cut-off level (slice level), and the current potential of inferior light beam push-pull signal SPP also can be in its cut-off level.
When read head was mobile slightly to the right, the current potential of this main beam push-pull signal and time light beam push-pull signal is umklapp transformationization simultaneously, that is the main beam push-pull signal can increase progressively, and inferior light beam push-pull signal can successively decrease.But if when mobile slightly left, the current potential of main beam push-pull signal and time light beam push-pull signal also is to present anti-phase variation, that is the main beam push-pull signal can successively decrease, and inferior light beam push-pull signal can increase progressively.
This main beam push-pull signal and this time light beam push-pull signal subtract each other and obtain one and recommend phase difference signal MPP-SPP.Clearly, main beam push-pull signal and time light beam push-pull signal are because of phase place amplitude mutual superposition on the contrary mutually, and the peak-to-peak value voltage of therefore recommending phase difference signal relatively becomes big.Otherwise, the main beam push-pull signal can obtain one with time light beam push-pull signal addition and recommend sum signal MPP+SPP, because these two signal phases cause amplitude to cancel out each other on the contrary, therefore this peak-to-peak value voltage of recommending sum signal can relatively diminish, shown in Fig. 2 (b).
Can obtain the relational expression of following discriminating disk mode by the detailed description of above-mentioned Fig. 2 (a) and Fig. 2 (b):
(1) if satisfy the relation of (MPP-SPP)＞(MPP+SPP), can judge that then CD is the CD of DVD-RAM form;
(2) if satisfy (MPP+SPP)＞(MPP-SPP), can judge that then CD is the DVD CD of non-RAM form.In fact, if this dynamic range (dynamic range) of recommending phase difference signal is recommended the dynamic range of sum signal greater than this, then the inferior light beam of this three light beam of decidable and luminous point that main beam forms can drop on adjacent flat district and groove on this CD.Again, if this peak-to-peak value voltage of recommending phase difference signal recommends the peak-to-peak value voltage of sum signal less than this, then this time of decidable light beam and luminous point that main beam forms can drop on this CD in three continuous grooves jointly.In sum, phase difference signal and the peak-to-peak value voltage of recommending sum signal are relatively recommended in utilization of the present invention, just can obtain main spot and time luminous point geometric relationship, just can judge the form of CD by this geometric relationship with respect to groove on the CD and flat region.
On the other hand, the form that also can distinguish this CD by this main beam push-pull signal relatively and the phase place of the waveform of time light beam push-pull signal why.That is this main beam push-pull signal is the opposite waveform of two phase place with time light beam push-pull signal, and then this this CD of decidable is a DVD-RAM format disc; Otherwise if this main beam push-pull signal is the identical waveform of two phase place with time light beam push-pull signal, then this this CD of decidable is the DVD CD of a non-RAM form.
Fig. 3 is the process flow diagram of discriminating disk mode of the present invention.As step 31, read head can move up and down earlier to finish and focus on action, promptly utilizes focus error signal correctly to find focus.Then according to the optical signalling of step 32 by the relevant discriminating disk mode of optical sensor acquisition.Again through step 33 the two peak-to-peak value voltage of MPP-SPP and MPP+SPP relatively.If step 33 comparative result is what negate, then shown in step 35, judge that the form of CD is the group of DVD-R, DVD-RW and DVD-ROM.Otherwise,, then shown in step 34, judge that the form of CD is DVD-RAM if step 33 comparative result is sure.After the form of CD is determined, just read or store data, shown in step 36 with the disk format of being judged.
Technology contents of the present invention and technical characterstic disclose as above, yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and done all replacement and modifications that does not deviate from spirit of the present invention.Therefore, protection scope of the present invention should be not limited to the content that embodiment discloses, and should comprise various do not deviate from replacement of the present invention and modifications, and is contained by the present patent application protection domain.
Claims (16)
1. the method for a discriminating disk mode is applied to an optical storage with read head of three light beams, it is characterized in that comprising the following step:
The resulting main beam push-pull signal of this read head is obtained one with time light beam push-pull signal stack recommend sum signal;
This main beam push-pull signal and this time light beam push-pull signal subtracted each other obtain one and recommend phase difference signal;
If this peak-to-peak value voltage of recommending phase difference signal greater than this peak-to-peak value voltage of recommending sum signal, judges that then this CD is the random access memory form.
2. the method for discriminating disk mode as claimed in claim 1 is characterized in that if this peak-to-peak value voltage of recommending phase difference signal less than this peak-to-peak value voltage of recommending sum signal, is then judged the non-random access memory form of this CD.
3. the method for discriminating disk mode as claimed in claim 1, the CD that it is characterized in that described random access memory form is a random access memory format digital video CD (DVD-RAM).
4. the method for discriminating disk mode as claimed in claim 3 is characterized in that described main beam push-pull signal is the opposite waveform of two phase place with time light beam push-pull signal.
5. the method for discriminating disk mode as claimed in claim 2 is characterized in that described main beam push-pull signal is the identical waveform of two phase place with time light beam push-pull signal.
6. the method for discriminating disk mode as claimed in claim 2, the CD that it is characterized in that described non-random access memory form comprise the digital video disk (DVD-ROM) of ROM (read-only memory) form, the digital video disk that repeatable read the is got form (digital video disk of DVD ± R), rewritable form (DVD ± RW).
7. the method for discriminating disk mode as claimed in claim 1 is characterized in that described three light beams form a main spot and twice luminous point on this CD.
8. the method for a discriminating disk mode is applied to an optical storage with read head of three light beams, it is characterized in that it comprises the following step:
Confirm the phase place of the waveform of resulting main beam push-pull signal of this read head and time light beam push-pull signal;
If this main beam push-pull signal is opposite with the phase place of time light beam push-pull signal, judge that then this CD is a random access memory form.
9. the method for discriminating disk mode as claimed in claim 8 is characterized in that judging that then this CD is the CD of a non-DVD-RAM form if this main beam push-pull signal is identical with the phase place of time light beam push-pull signal.
10. the method for discriminating disk mode as claimed in claim 9 is characterized in that the CD of described non-DVD-RAM form comprises the CD of DVD-ROM form, the CD of DVD ± R form, the CD of DVD ± RW form.
11. the method for a discriminating disk mode is applied to an optical storage with read head of three light beams, it is characterized in that comprising the following step:
Carry out the focusing action of this read head;
By this read head acquisition optical signalling;
The resulting main beam push-pull signal of this read head is obtained one with time light beam push-pull signal stack recommend sum signal;
This main beam push-pull signal and this time light beam push-pull signal subtracted each other obtain one and recommend phase difference signal;
If this peak-to-peak value voltage of recommending phase difference signal greater than this peak-to-peak value voltage of recommending sum signal, is judged that promptly this CD is a random access memory form, otherwise just is judged to be the non-random access memory form;
With the form of being judged this CD is read or stores data.
12. the method for discriminating disk mode as claimed in claim 11, the CD that it is characterized in that described random access memory form are random access memory format digital video CD.
13. the method for discriminating disk mode as claimed in claim 12 is characterized in that described main beam push-pull signal is the opposite waveform of two phase place with time light beam push-pull signal.
14. the method for discriminating disk mode as claimed in claim 11 is characterized in that if judge that this CD is the non-random access memory form, represents that then this main beam push-pull signal is the identical waveform of two phase place with time light beam push-pull signal.
15. the method for discriminating disk mode as claimed in claim 11, the CD that it is characterized in that described non-random access memory form comprise that the digital video disk of the form of ROM (read-only memory), numeral that repeatable read is got form is characterized in that the digital video disk of CD, rewritable form.
16. the method for discriminating disk mode as claimed in claim 11 is characterized in that described three light beams form a main spot and twice luminous point on this CD.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100052394A CN100337280C (en) | 2004-02-17 | 2004-02-17 | Method for distinguishing optical disk form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100052394A CN100337280C (en) | 2004-02-17 | 2004-02-17 | Method for distinguishing optical disk form |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710086243 Division CN101030422A (en) | 2004-02-17 | 2004-02-17 | Method for discriminating disk mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1658312A true CN1658312A (en) | 2005-08-24 |
| CN100337280C CN100337280C (en) | 2007-09-12 |
Family
ID=35007722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100052394A Expired - Fee Related CN100337280C (en) | 2004-02-17 | 2004-02-17 | Method for distinguishing optical disk form |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100337280C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100367367C (en) * | 2004-05-25 | 2008-02-06 | 威盛电子股份有限公司 | Method for determining type of digital versatile disc |
| US7570561B2 (en) | 2004-05-25 | 2009-08-04 | Bryan Tai | Method for determining type of digital versatile discs |
| US7602684B2 (en) | 2003-09-15 | 2009-10-13 | Chun-Ta Chen | Discriminating method of an optical disc device for ascertaining the format of a loaded optical disc |
| US7626907B2 (en) | 2004-05-25 | 2009-12-01 | Ricky Chang | Method and apparatus for determining type of digital versatile disc |
| US7746745B2 (en) | 2004-05-25 | 2010-06-29 | Ricky Chang | Method for determining the type of digital versatile disc |
| US7843786B2 (en) | 2002-10-24 | 2010-11-30 | Yi-Chung Chan | Discrimination method of optical storage medium |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11144255A (en) * | 1997-11-04 | 1999-05-28 | Sony Corp | Device and method for reproducing optical information |
| US6088308A (en) * | 1998-02-13 | 2000-07-11 | International Business Machines Corporation | System for creating, reading and writing on rotatable information storage media, a tracking circuit for providing positioning information |
-
2004
- 2004-02-17 CN CNB2004100052394A patent/CN100337280C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7843786B2 (en) | 2002-10-24 | 2010-11-30 | Yi-Chung Chan | Discrimination method of optical storage medium |
| US7602684B2 (en) | 2003-09-15 | 2009-10-13 | Chun-Ta Chen | Discriminating method of an optical disc device for ascertaining the format of a loaded optical disc |
| CN100367367C (en) * | 2004-05-25 | 2008-02-06 | 威盛电子股份有限公司 | Method for determining type of digital versatile disc |
| US7570561B2 (en) | 2004-05-25 | 2009-08-04 | Bryan Tai | Method for determining type of digital versatile discs |
| US7626907B2 (en) | 2004-05-25 | 2009-12-01 | Ricky Chang | Method and apparatus for determining type of digital versatile disc |
| US7746745B2 (en) | 2004-05-25 | 2010-06-29 | Ricky Chang | Method for determining the type of digital versatile disc |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100337280C (en) | 2007-09-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1177318C (en) | Optical pick-up device and detecting method of tilt | |
| CN1805035A (en) | Method and apparatus of identifying disc types | |
| CN100337280C (en) | Method for distinguishing optical disk form | |
| JP4444977B2 (en) | Optical pickup device | |
| US20100315932A1 (en) | Optical storage medium, mastering method and apparatus for reading of respective data | |
| US20080151722A1 (en) | Optical disc device and method for discriminating different kinds of optical discs | |
| EP2009627B1 (en) | Apparatus comprising a pickup providing three beams for reading data from or writing data to an optical storage medium, and respective optical storage medium | |
| EP1755116A2 (en) | Optical pickup apparatus capable of detecting and compensating for spherical aberration caused by thickness variation of recording layer | |
| US20080181062A1 (en) | Method and apparatus for controlling focus of an optical information storage medium | |
| US8036092B2 (en) | Optical head device for detecting an error signal and an optical information recording/reproducing device | |
| CN101030422A (en) | Method for discriminating disk mode | |
| JP4083761B2 (en) | Recording power value determination method and optical disc apparatus | |
| TWI236003B (en) | Method of disc discrimination | |
| CN1180407C (en) | Device for producing search direction detection signal by optical reading | |
| CN1659636A (en) | Optical scanning device | |
| US8213278B2 (en) | System comprising an optical disc and an apparatus for reading of respective data | |
| US8203915B2 (en) | Optical disc reader | |
| EP2425429B1 (en) | Optical storage medium comprising tracks with modified mark dimensions, and respective apparatus for reading of data | |
| JP5062240B2 (en) | Optical drive device | |
| CN101040330A (en) | An optical record carrier | |
| CN100353424C (en) | Method and system for forming optical main beam and side beam for multi-disk format | |
| EP2287838A1 (en) | Optical storage medium comprising tracks with modified mark dimensions, and respective apparatus for reading of data | |
| KR100647946B1 (en) | Apparatus for optical pick-up | |
| JP2011040143A (en) | Optical drive device | |
| JP2006172694A (en) | Optical disk apparatus |
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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070912 Termination date: 20160217 |