CN100373463C - Light disk driver and method for judging disk type - Google Patents
Light disk driver and method for judging disk type Download PDFInfo
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- CN100373463C CN100373463C CNB2005100895120A CN200510089512A CN100373463C CN 100373463 C CN100373463 C CN 100373463C CN B2005100895120 A CNB2005100895120 A CN B2005100895120A CN 200510089512 A CN200510089512 A CN 200510089512A CN 100373463 C CN100373463 C CN 100373463C
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Abstract
The invention relates to CD driver and its method used to judge disk type. It includes the following steps using DVD laser beam to irradiate indicator; optics reading the first numerical value of the SBAD signal; judging whether the disk is DVD or CD disk sheet according to the first numerical value; if it is CD disk sheet, judging whether it is read only or not; using CD laser beam to irradiate indicator; optics reading the second numerical value; calculating different absolute value of the fist and second numerical value; if it is the read only, judging whether it is CD-R or CD-ROM according to the absolute value; if it is the non read only, judging whether it is the CD-RW or not according to the second numerical value.
Description
[technical field]
The invention relates to a kind of CD-ROM drive and detect the device of the method for disc specification, and particularly relevant for a kind of DVD-ROM CD-ROM drive and detect the device of the method for disc specification.
[prior art]
Digital multi DVD multidisc (Digital Versatile Disc, application DVD), the life that oneself is quite deeply human.For the application that makes DVD drive wider, the disc (comprise DVD-ROM, DVD-R/RW, DVD+R/RW, DVD-ROM DL (Dual Layer), DVD+RDL and DVD-R DL etc.) of DVD drive then except supporting the DVD form, more want to support other disc specification, as CD-ROM (Compact DiscRead-Onlv Memory, CD-ROM), CD-R (Compact Disc Recordable, CD-R), (Compact Disc Rewritable CD-RW) reaches or the like can to repeat to write CD.And after the judgement disk types of CD-ROM drive after disc is inserted, just can determine access action to the disc of different size.And in the servosignal of CD-ROM drive, one of the purposes of SBAD signal (Side Beam Added Signal) is in order to differentiate disk types.
In order to judge whether disc is CD-ROM, then threshold value must be arranged to judge whether disc is CD-ROM to the numerical value D1 that produces.Please refer to Figure 1A, it illustrates is the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the DVD laser light.It illustrates is with all kinds of discs, and the value and the number of times record that can produce the SBAD signal in the irradiation of DVD laser light down form.For example get the disc of 20 CD-ROM,, note with the number of times that produces with the value of disc corresponding SBAD signal that produces under the irradiation of DVD laser light.For example the value of SBAD signal is 0.5 to have 1 time, and the value of SBAD signal is 0.6 to have 2 times, and the value of SBAD signal is 1.0 to have 3 times or the like, its corresponding relation is drawn shown in Figure 1A again.After, the corresponding relation of the disc of CD-R and CD-RW is also drawn shown in Figure 1A, then can learn the distribution situation of all kinds of discs.
Because of the disc of same specification, its characteristic can't be absolutely close, but the SBAD signal that produces still can be concentrated the numerical value that is distributed in a certain district band.In Figure 1A, the disc of CD-ROM is under the irradiation of DVD laser light, and the curve C roml of the SBAD signal value that it is corresponding promptly falls between the numerical value V11 to V12.The disc of CD-R is under the irradiation of DVD laser light, and the curve C rl of the SBAD signal value that it is corresponding promptly falls between the numerical value V13 to V14.The disc of CD-RW is under the irradiation of DVD laser light, and the curve C rwl of the SBAD signal value that it is corresponding promptly falls between the numerical value V15 to V16.Then but mat learns as with being set between the numerical value V11 to V14 of threshold value among Figure 1A whether disc is CD-ROM.
By Figure 1A as can be known, because the scope of CD-R and CD-RW is too close, if the non-CD-ROM of disc then needs to declare again down with the irradiation of CD laser light again.Please refer to Figure 1B, it illustrates is the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the CD laser light.The disc of CD-ROM is under the irradiation of CD laser light, and the curve C rom2 of the SBAD signal value that it is corresponding promptly falls between the numerical value V21 to V22; The disc of CD-R is under the irradiation of CD laser light, and the curve C r2 of the SBAD signal value that it is corresponding promptly falls between the numerical value V23 to V24; The disc of CD-RW is under the irradiation of CD laser light, and the curve C rw2 of the SBAD signal value that it is corresponding promptly falls between the numerical value V25 to V26.As can be known, the scope of CD-RW and CD-R correspondence has obviously to separate among Figure 1B.Then district's band that value fell of visual disc is CD-RW or CD-R with the decision disc.
Yet above-mentioned 1A and 1B figure are the numeric distribution figure of the SBAD signal under the ideal state.Please refer to Fig. 1 C, it illustrates is under the non-ideal conditions, the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the DVD laser light.For the very different disc of quality, if the characteristic reflectivity of CD-R disc is higher, the scope of corresponding SBAD signal may cause the situation of curve C r3 under the irradiation of DVD laser light, makes curve C r3 and curve C rom3 between numerical value V31 to V34 overlapping be arranged.If the numerical value of the SBAD signal of disc correspondence falls between the numerical value V31 to V34, then can cause erroneous judgement.Declare even re-use the radium-shine recovery of CD, still can't remedy.
And when testing the threshold value of CD-R disc,, also can cause error because of the big or small intensity that directly influences the SBAD signal of laser light intensity.The situation of Fig. 1 C for example, when setting the threshold value of CD-R, DVD laser light power is bigger, and causes the situation as curve C r3, also makes the setting of threshold value more add difficulty.
[summary of the invention]
In view of this, purpose of the present invention is exactly in the method that a kind of CD-ROM drive and judgement disk types thereof are provided.Can decrease in the uncertain factor when judging disk types, and make the accuracy rate of judging improve.
According to purpose of the present invention, a kind of method of judging disk types is proposed, be used for optical read head system and can produce in order to read one first laser beam of DVD disc, reach in order to read one second laser beam of CD disc.At first, after record disc reflects first laser beam, first numerical value of the SBAD signal that optical read head produces.Then, judge that according to first numerical value disc is DVD disc or CD disc.After, if disc is the CD disc, then carry out following steps.At first, judge that according to first numerical value disc is a read-only type disc or a non-read-only type disc.Then, after record disc reflects second laser beam, the second value of the SBAD signal that optical read head produces.After, calculate an absolute value of the difference of first numerical value and second value.Then, if disc is read-only type disc, judge that with absolute value disc is CD-R or CD-ROM.If disc is non-read-only type disc, judges with second value whether disc is CD-RW, otherwise judge that with absolute value disc is CD-R or CD-ROM.
According to another object of the present invention, a kind of CD-ROM drive is proposed, in order to read disc.CD-ROM drive comprises: optical read head and processing unit.Optical read head comprises the first radium-shine light source, second radium-shine light source and the photodetector, and first laser beam is in order to read the DVD disc, and second laser beam is in order to read the CD disc.Disc reflects the first radium-shine light source emitted light beams and produces one first folded light beam.Disc reflects the second radium-shine light source emitted light beams and produces one second folded light beam.Photodetector receives one first numerical value of first folded light beam with generation SBAD signal, and receives second folded light beam to produce a second value of SBAD signal.Processing unit judges that according to first numerical value whether disc is DVD disc or CD disc, calculates the absolute value of the difference of first numerical value and second value.If disc is the CD disc, judge that according to first numerical value disc is a read-only type disc or a non-read-only type disc.If disc is read-only type disc, judge that with absolute value disc is CD-R or CD-ROM.If disc is non-read-only type disc, judge with second value whether disc is CD-RW.If the non-CD-RW of disc judges that with absolute value disc is CD-R or CD-ROM.Wherein, the first radium-shine light source and the second radium-shine light source can be laser diode.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below:
[description of drawings]
It is the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the DVD laser light that Figure 1A illustrates.
It is the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the CD laser light that Figure 1B illustrates.
It is under the non-ideal conditions that Fig. 1 C illustrates, the numeric distribution figure of all kinds of discs corresponding SBAD signal that produces under the DVD laser light.
Fig. 2 illustrates the CD-ROM drive Organization Chart according to a preferred embodiment of the present invention.
It is the method flow diagram that proposes the judgement disc specification of preferred embodiment according to the present invention that Fig. 3 illustrates.
Fig. 4 is the absolute value distribution plan of all kinds of discs difference of the corresponding SBAD signal numerical value that produces under first laser light and the irradiation of second laser light.
[embodiment]
Please refer to Fig. 2, it illustrates the CD-ROM drive Organization Chart according to a preferred embodiment of the present invention.CD-ROM drive 300 is in order to read disc 350.CD-ROM drive 300 comprises optical read head 310 and processing unit 320.
Optical read head 310 (Pick-Up Head) can produce in order to read first laser beam of DVD disc, and in order to read second laser beam of CD disc, optical read head 310 comprises DVD laser diode 311, CD laser diode 312 and photodetector 315 (Photo detector).DVD laser diode 311 is in order to launch first laser beam to disc 350.CD laser diode 312 is in order to launch second laser beam to disc 350.Photodetector 315 is in order to receive the reflection lasering beam that disc produces respectively for first laser beam and second laser beam, to produce the SBAD signal.
Please refer to Fig. 3, it illustrates is method flow diagram according to the judgement disc specification of a preferred embodiment of the present invention.At first, shown in step 401, record disc under first laser beam irradiation, the numerical value S1 of the SBAD signal that optical read head produces.After, shown in step 402, judge that according to numerical value S1 disc is DVD disc or CD disc.After, if disc is judged as the DVD disc then as step 403.Shown in step 404,, whether greater than the first setting value SV1, whether be read-only type and write down to judge disc according to numerical value S1 if disc is the CD disc.If numerical value S1 is greater than the first setting value SV1, then disc is read-only type.Anti-, the non-read-only type of disc then.
Afterwards, shown in step 405, record disc 350 under second laser beam irradiation, the numerical value S2 of the SBAD signal that optical read head produces.After, shown in step 406, the absolute value A1 of the difference of evaluation S1 and numerical value S2.
Then, shown in step 407, according to the record of step 403 to learn whether disc 350 is read-only type.If disc 350 is not read-only type, then shown in step 411, judge that whether numerical value S2 is greater than the second setting value SV2.If numerical value S2 is not more than the second setting value SV2, then shown in step 412, determine that disc 350 is CD-RW.
If in the step 411, numerical value S2 then shown in step 413, judges that whether absolute value A1 is less than the 3rd setting value SV3 greater than the second setting value SV2.If absolute value A1 is not less than the 3rd setting value SV3, then, determine that disc is CD-R as described in the step 414.If absolute value A1 is less than the 3rd setting value SV3, then, determine that disc is CD-ROM as described in the step 415.
If in the step 407, be to learn that disc 350 is read-only type, then shown in step 421, judge that whether absolute value A1 is less than the 4th setting value SV4.If absolute value A1 is not less than the 4th setting value SV4, then shown in step 422, determine that disc is CD-R.If absolute value A1 less than the 4th setting value SV4, then shown in step 423, determines that disc is CD-ROM.
To 405, it is not certain in proper order in step 403.Can be earlier with the test of second laser beam, again with the test of first laser beam, for example carry out the flow process of step 403 to 405 with step 403,405 and 404 order.
In the step 405, be the absolute value A1 of the difference of evaluation S1 and numerical value S2, but when the mat difference makes disc face the laser diode of varying strength, the SBAD signal eliminated in response to the difference that the varying strength laser beam is produced, and then judged disk types more accurately.Also the influence with disc of stronger or more weak reflectivity can be reduced.
Because the characteristic of optical read head, can learn that the power of second laser beam also can be along with increase when the power of first laser beam greatly the time; Otherwise, when the power of first laser beam hour, the power of second laser beam also can be along with minimizing.Then under notion of the present invention, can utilize this characteristic, set its threshold value for the disc of same specification, no matter the power of first or second laser light is bigger than normal or less than normal at this moment, the numerical value of SBAD of numeric distribution and the reflection second laser beam gained that same disc is reflected the SBAD of the first laser beam gained subtracts each other, and can make to reduce because of the laser light power variability that causes bigger than normal or less than normal.
And the stronger disc of reflectivity, no matter under the irradiation of first laser beam or second laser beam, the SBAD numerical value that obtains also can be bigger.So subtract each other, can make to reduce because of the stronger variability that causes of reflectivity with numerical value with same disc SBAD of gained under the numeric distribution of the SBAD of gained under first laser beam irradiation and second laser beam irradiation.In like manner, reflectivity more weak also by this method variability is reduced.
Fig. 4 is the absolute value distribution plan of all kinds of discs difference of the corresponding SBAD signal numerical value that produces under first laser beam and second laser beam irradiation.It is with each disc in the corresponding down SBAD signal that produces of laser beam and laser beam irradiation, the absolute value of getting its difference and drafting pattern 4 under number of times is corresponding.
Curve C d1 is the SBAD difference value distribution curve of CD-ROM and CD-RW disc, and scope is between numerical value V51 and the V52.Curve C d2 is the SBAD difference value distribution curve of CD-R disc, and scope is between numerical value V53 and the V54.The curve distribution of Fig. 4 is because of the absolute value of the difference of the numerical value of the SBAD signal that utilizes first laser beam and the second laser beam correspondence gets the size of the numerical value of the laser light power influences of can forgoing SBAD signal.
Please be simultaneously with reference to Figure 1A, 1B, 3 and Fig. 4, the first setting value SV1 in step 403 for example can be numerical value V14, V11 among Figure 1A or the numerical value between it.The second setting value SV2 of step 411 for example can be numerical value V23, V26 among Figure 1B or the numerical value between it.The 3rd setting value SV3 of step 413 and the 4th setting value SV4 of step 42 1 for example can be V52, V53 among Fig. 4 or the numerical value between it.
The method of disclosed CD-ROM drive of the above embodiment of the present invention and detection disc specification thereof, utilize the absolute value of difference of the numerical value of the SBAD under first and second laser light, minimizing is because of the different uncertain factors that cause of sheet sub-feature difference or laser light power, and significantly promotes the accuracy rate of declaring sheet.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (8)
1. a method of judging disk types is used for an optical read head, is can produce in order to read one first laser beam of DVD disc, reaches in order to read one second laser beam of CD disc, and this method comprises:
After writing down a disc and reflecting this first laser beam, one first numerical value of the SBAD signal that this optical read head produces;
Judge that according to this first numerical value this disc is DVD disc or CD disc;
If this disc is the CD disc, then carry out following steps:
Judge that according to this first numerical value this disc is a read-only type disc or a non-read-only type disc;
After writing down this disc and reflecting this second laser beam, a second value of the SBAD signal that this optical read head produces;
Calculate an absolute value of the difference of this first numerical value and this second value;
If this disc is through being judged as this read-only type disc, declaring this disc again with this absolute value is CD-R or CD-ROM; And
If this disc through being judged as this non-read-only type disc, judges with this second value whether this disc is CD-RW, is CD-R or CD-ROM otherwise declare this disc again with this absolute value.
2. method according to claim 1 is characterized in that, judges that according to this first numerical value this disc is in the step of a read-only type disc or a non-read-only type disc, comprising:
Judge that whether this first numerical value is greater than a setting value;
If this first numerical value is greater than a setting value, this disc is this read-only type disc; And
If this first numerical value is not more than this setting value, this this non-read-only type disc of disc system.
3. method according to claim 1 is characterized in that, judges that with this absolute value this disc is in the step of CD-R or CD-ROM, comprising:
Judge that whether this absolute value is less than a setting value;
If this absolute value is not less than a setting value, this disc is the CD-R disc; And
If this absolute value is less than this setting value, this disc is a CD-ROM disks.
4. method according to claim 1 is characterized in that, judges that with this second value whether this disc is in the step of CD-RW, comprising:
Judge that whether this second value is greater than a setting value;
If this second value is not more than this setting value, this disc is the CD-RW disc;
If this second value greater than this setting value, is then carried out following steps:
Judge that whether this absolute value is less than one second setting value;
If this absolute value is less than this setting value, this disc is a CD-ROM disks; And
If this absolute value is not less than this setting value, this disc is the CD-R disc.
5. CD-ROM drive, in order to read a disc, this CD-ROM drive comprises:
One optical read head comprises:
One first radium-shine light source is to produce one first laser beam in order to read the DVD disc, and this disc system reflects this first laser beam and produces one first folded light beam;
One second radium-shine light source is to produce one first laser beam in order to read the CD disc, and this disc system reflects this CD laser diode emitted light beams and produces one second folded light beam; And
One photodetector receives this first folded light beam and receives this second folded light beam to produce a second value of SBAD signal to produce one first numerical value of SBAD signal, to reach; And
One processing unit, judge according to this first numerical value whether this disc is DVD disc or CD disc, calculate an absolute value of the difference of this first numerical value and this second value, if this disc is the CD disc, judge that according to this first numerical value this disc is a read-only type disc or a non-read-only type disc, if this this read-only type disc of disc system, declaring this disc again with this absolute value is CD-R or CD-ROM, if this this non-read-only type disc of disc system, judge with this second value whether this disc is CD-RW, if the non-CD-RW of this disc, declaring this disc again with this absolute value is CD-R or CD-ROM.
6. CD-ROM drive according to claim 5 is characterized in that, when this processing unit judges that with this first numerical value this disc is a read-only type disc or a non-read-only type disc, is to judge that whether this first numerical value is greater than a setting value;
Wherein, greater than a setting value, this disc is the disc of this read-only type as if this first numerical value;
Wherein, if this first numerical value is not more than this setting value, this disc is the disc of this non-read-only type.
7. CD-ROM drive according to claim 5 is characterized in that, when this processing unit judges that with this absolute value this disc is CD-R or CD-ROM, is to judge that whether this absolute value is less than a setting value;
Wherein, if this absolute value is not less than a setting value, this disc is the CD-R disc;
Wherein, less than this setting value, this disc is a CD-ROM disks as if this absolute value.
8. CD-ROM drive according to claim 5 is characterized in that, when this processing unit judges with this second value whether this disc is CD-RW, is to judge that whether this second value is greater than a setting value;
Wherein, if this second value is not more than this setting value, this disc is the CD-RW disc;
Wherein, greater than this setting value, whether this processing unit judges this absolute value less than one second setting value as if this second value, and less than this setting value, this disc is a CD-ROM disks as if this absolute value, otherwise this disc is the CD-R disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100895120A CN100373463C (en) | 2005-07-28 | 2005-07-28 | Light disk driver and method for judging disk type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100895120A CN100373463C (en) | 2005-07-28 | 2005-07-28 | Light disk driver and method for judging disk type |
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| Publication Number | Publication Date |
|---|---|
| CN1905017A CN1905017A (en) | 2007-01-31 |
| CN100373463C true CN100373463C (en) | 2008-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100895120A Expired - Fee Related CN100373463C (en) | 2005-07-28 | 2005-07-28 | Light disk driver and method for judging disk type |
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| CN (1) | CN100373463C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392554A (en) * | 2001-05-15 | 2003-01-22 | 三星电子株式会社 | Method for identifying optic disc type |
| JP2003217119A (en) * | 2001-11-16 | 2003-07-31 | Victor Co Of Japan Ltd | Type distinction method of optical disk and optical disk apparatus using the method |
| CN1581335A (en) * | 2003-08-08 | 2005-02-16 | 联发科技股份有限公司 | Optical disk type identifying method |
-
2005
- 2005-07-28 CN CNB2005100895120A patent/CN100373463C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1392554A (en) * | 2001-05-15 | 2003-01-22 | 三星电子株式会社 | Method for identifying optic disc type |
| JP2003217119A (en) * | 2001-11-16 | 2003-07-31 | Victor Co Of Japan Ltd | Type distinction method of optical disk and optical disk apparatus using the method |
| CN1581335A (en) * | 2003-08-08 | 2005-02-16 | 联发科技股份有限公司 | Optical disk type identifying method |
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| Publication number | Publication date |
|---|---|
| CN1905017A (en) | 2007-01-31 |
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