CN101246711B - Disc kind discrimination method - Google Patents
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- CN101246711B CN101246711B CN2007100798219A CN200710079821A CN101246711B CN 101246711 B CN101246711 B CN 101246711B CN 2007100798219 A CN2007100798219 A CN 2007100798219A CN 200710079821 A CN200710079821 A CN 200710079821A CN 101246711 B CN101246711 B CN 101246711B
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Abstract
The invention is a disc type judging method, comprising the steps that: a DVD driver read-write head is moved to the blank area having no record data; after the disc stops rotating, laser light is irradiated to the blank area; reflecting signals from the surface layer and the reflecting layer of the disc are measured; and the type of the disc arranged in the DVD driver is judged according to the time difference between the two reflecting signal. According to the invention, the reflecting signals are free from being affected by data pits on the disc, thus improving the accuracy of judging disc type.
Description
Technical field
The invention relates to a kind of disc kind discrimination method, and particularly relevant for a kind of utilize video disc not the white space of record data carry out the method for disc kind discrimination.
Background technology
Arriving along with the information age, in the face of and numerical data that form differ huge the time from various number of tubes, the light memory medium that have simultaneously that storage volume is big, access speed is fast, is easy to carry about with one and is beneficial to advantages such as preservation has just like become modern's one of indispensable application tool when storage data.
DVD (Digital Versatile Disk, DVD) be the media for storing optical information of a new generation, its packing density and capacity are compared to CD (Compact Disk, CD) significant progress is all arranged, the main flow that the DVD drive that therefore can read this class CD also replaces traditional CD-ROM drive gradually to be become in the market is equipped with.Yet,, still have many data to be preserved, so DVD drive also must can read general CD with CD owing to use in the epoch of CD-ROM drive in the past.In addition, the form of DVD is also divided into specifications such as DVD-ROM, DVD-R, DVD-RW, DVD-RAM, DVD+R, DVD+RW because of the difference of its purposes and each support manufacturer of family, the form of CD also can be divided into specifications such as CD-ROM, CD-R and CD-RW, therefore when the design DVD drive, also compatible problem must be considered, user's demand can be satisfied.
Though be to use same read/write head to read CD and DVD in DVD drive, these two kinds of CDs structurally still exist many differences.Fig. 1 is the longitudinal sectional drawing of general CD, see also Fig. 1, the thickness of general CD 100 is about 1.2mm, and it is to constitute by form recording layer 120, reflection horizon 130 and printed layers 140 in regular turn on the surface of the substrate 110 with pre-rail groove at quarter (pre-grooved).Fig. 2 is the longitudinal sectional drawing of digital versatile disc, see also Fig. 2, digital versatile disc 200 is, and to be blank substrate (the Dummy substrate) 250 of 0.6mm and thickness by thickness constituted by the data substrate of 0.6mm, then being to utilize a knitting layer 240 to fit between these two kinds of substrates, is the CD body of 1.2mm and form thickness.Wherein, the data substrate is to be the end with a substrate 210 with rail groove at pre-quarter, then forms recording layer 220 and reflection horizon 230 on it in regular turn.
Just because of the structure of two kinds of CDs is very not identical, the read/write head of CD-ROM drive also must adopt the radium-shine of different capacity to shine when reading of data, and being used for the mode of interpretation data also can be different, therefore CD-ROM drive also must be differentiated the kind of video disc earlier before reading of data, and apply mechanically the suitable mode that reads, reading and recording data wherein that could be correct.
In the known practice, distinguish that the disc kind that places CD-ROM drive mainly is to utilize finish the reflection interval of calculating laser light.At first, utilize read/write head that laser light is sent in the data field of video disc, when touching video disc surperficial, laser light can produce a reflected signal (noting that the reflection horizon surface distributed has hole, many holes), and when touching the reflection horizon of video disc, laser light also can produce a reflected signal, time difference between above-mentioned two reflected signals and a default critical value are compared, judge the kind of video disc according to this.As Fig. 1 and shown in Figure 2, because the substrate of CD 100 110 its thickness are greater than the substrate 210 of DVD 200, therefore when laser light irradiation CD 100, the time difference of reflected signal can be greater than the time difference that is produced with laser light irradiation DVD 200, in view of the above, CD-ROM drive just can judge that video disc is CD or DVD.
Yet, above-mentioned traditional disc kind discrimination method is that laser light is radiated in the data field that record data are arranged in the video disc, have through the hole, hole (pits) of burning or etching caused and on the video disc substrate of this data field, distributing, these holes, hole can make reflected light produce scattering or diffraction, and there is a depth difference flat region with interval, hole, hole on the video disc, and this depth difference will make the time difference of reflected signal produce error.Therefore, CD-ROM drive might be judged disc kind by accident because of these errors, and can't correctly read the data that are stored in the video disc.
Summary of the invention
In view of this, purpose of the present invention is providing a kind of disc kind discrimination method exactly, by read/write head being moved to the not white space of record data, carry out the differentiation action of disc kind again, and can avoid causing the situation of erroneous judgement because laser light touches hole, the hole district of video disc.
Based on above-mentioned and other purpose, the present invention proposes a kind of disc kind discrimination method, is applicable to DVD drive.Wherein this DVD drive has comprised read/write head, Spindle Motor and step motor, and is suitable for placing video disc.This disc kind discrimination method comprises the following steps: that at first mobile read/write head is to the white space of the not storage data of video disc.After the video disc that stops the rotation, the laser light that shines first wavelength is in white space, and measure laser light from the surface reflection of white space first o'clock distance to read/write head, and the reflective layer reflects of laser light in white space is to second o'clock distance of read/write head.Calculate the difference of first o'clock distance and second o'clock distance, and this difference and reference value are compared, to judge the kind of video disc.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein to the white space of the not storage data of video disc, more comprise the rotating spindle motor and the lasting very first time at mobile read/write head, whether placed appropriate to measure video disc.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein mobile read/write head to the white space of the not storage data of video disc more comprises: move read/write head towards center of circle direction, till read/write head reaches the dead-centre position.Rotate video disc with first speed, and open read/write head to shine laser light to video disc.Follow rail action, make read/write head follow track and move toward anti-center of circle direction with second speed.Receive and handle high frequency reflection signal, and identification high frequency reflection signal is high levels or low level by the video disc reflection.Calculate the very first time point of the initial generation of low level institute, count by very first time point the 3rd o'clock apart from after, stop to move this read/write head, and with second speed move read/write head and towards center of circle direction move the 4th o'clock apart from after, stop to move above-mentioned read/write head, wherein the 4th o'clock distance was greater than the 3rd o'clock distance.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein identification high frequency reflection signal is that high levels or low level more comprise when shining laser light in the flat region, and high frequency reflection signal is a high levels; And when shining laser light in hole district, hole, high frequency reflection signal is a low level.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein the dead-centre position is the position that read/write head can arrive the most close video disc center of circle.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein following rail action makes read/write head follow track and more comprises toward the step that anti-center of circle direction moves with second speed: use spectroscope, and laser light is shone be divided into a main spot and two secondary luminous points when video disc.A plurality of reflected light of above-mentioned luminous point throw the optical detector into read/write head, and the planned orbit that read/write head makes main spot follow video disc according to its its result of calculation of volume reflection of secondary luminous point advances or retreats.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein identification high frequency reflection signal is that the step of high levels or low level more comprises more catoptrical volume reflection and default value.If it is high levels that volume reflection is higher than default value; If it then is low level that volume reflection is lower than default value.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein count through the 3rd o'clock distance by very first time point, the step that stops mobile read/write head more comprises the frenquency signal that produces according to frequency circuit, and wherein this frenquency signal is to be made of a plurality of same units frequencies.Than higher-frequency reflection signal and frenquency signal, calculate at the 3rd o'clock apart from the relation of cell frequency.
According to the described disc kind discrimination method of preferred embodiment of the present invention, wherein the test section is near the center of circle, and the data field is positioned at the periphery of test section.The program internal memory district is positioned at the outer peripheral areas of test section, and white space is positioned at enclosing of program internal memory district.Track is to extend to the data field by the test section according to helical curve.
The present invention is then just shone laser light surface and reflection horizon in white space because of earlier read/write head being moved to the white space that does not have storage data in the video disc, and the lead time of calculating laser light reflection is judged disc kind.Avoid in view of the above influencing because of the hole, hole that radium-shine reflection of light is subjected on the data area, and the generation of minimizing erroneous judgement situation.
Beneficial effect of the present invention:
Disc kind discrimination method of the present invention mainly is that the read/write head with DVD drive moves to the white space that does not have record data on the video disc, and the top layer and the needed time of reflective layer reflects laser light of calculating white space respectively, judge the disc kind that is placed in the DVD drive according to this.Can avoid hole, the hole influence reflection signal in the disk data district thus, and make that differentiating the result makes a mistake, and can't read disk data.
For above-mentioned and other purpose of the present invention, feature and advantage can be become apparent, preferred embodiment of the present invention cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the longitudinal sectional drawing in the partial data district of CD.
Fig. 2 is the longitudinal sectional drawing in the partial data district of DVD.
Fig. 3 is the process flow diagram of the disc kind discrimination method shown in the preferred embodiment of the present invention.
Fig. 4 is the process flow diagram of the mobile read/write head shown in the preferred embodiment of the present invention to the video disc white space.
Fig. 5 is the transverse cross-sectional view of video disc.
Fig. 6 is the longitudinal sectional drawing of the sub-program region of memory of video disc.
Embodiment
When utilizing laser light irradiation video disc and differentiating disc kind according to the length of its reflection interval, if laser light is shone the zone that records data, the hole, hole that is subjected to possibly its reflection interval on the video disc influences, and judges by accident and produce.In order to avoid such situation, utilization of the present invention moves to the white space that does not have record data on the video disc with read/write head, carry out the differentiation action of disc kind again, and the situation that can avoid effectively judging by accident takes place.In order to make content of the present invention more clear, below the example that can implement according to this really as the present invention especially exemplified by embodiment.
Fig. 3 is the process flow diagram of the disc kind discrimination method shown in the preferred embodiment of the present invention.Present embodiment is to utilize a DVD drive that is suitable for placing video disc that the detailed process of the method for differentiating disc kind is described.Wherein, in DVD drive, include devices such as read/write head, Spindle Motor and step motor, and via this method, it is CD or DVD that DVD drive can be differentiated the video disc that is placed on wherein.
Before the differentiation of carrying out disc kind, can guarantee appropriate being placed in the DVD drive of video disc by the Spindle Motor a period of time (for example 2 seconds) of for example rotating in the DVD drive.Then the read/write head of DVD drive can be moved on the white space that does not have storage data on the video disc (step 310).
Fig. 4 is the transverse cross-sectional view of video disc, sees also Fig. 4, comprises white space, program internal memory (Program Memory Area, PMA) zone, and data field, and white space and program internal memory zone can merge the test section that is of title in video disc 400.Wherein, white space is suitable for receiving the laser light of trial fire (Trial Writing) near the center of circle 410 when carrying out calibration of power action (Power Calibration); The program internal memory zone is the periphery that is positioned at white space, mainly be the catalogue listing that is used for writing down video disc (Table Of Content, TOC); The data field then is to be positioned at outermost, desires to be stored in data on the video disc in order to the record user.In the present embodiment, read/write head is exactly to move to above-mentioned white space, and in order to be illustrated more clearly in the detailed step that read/write head is moved to this white space, below does further explanation for an embodiment in addition.
Fig. 5 please consults Fig. 4 and Fig. 5 simultaneously for the process flow diagram of the mobile read/write head shown in the preferred embodiment of the present invention to the video disc white space.At first, shown in step 510, move read/write head towards the direction in the center of circle 410 of video disc 400, till read/write head reaches the dead-centre position.In the present embodiment, the dead-centre position for example can be by step motor traction read/write head, can arrive the position in the center of circle 410 of the most close video disc 400.
Next, rotate video disc 400 (step 520) with first speed.And open read/write head with laser light irradiation video disc 400 (step 530).Then, in step 540, follow the rail action by step motor traction read/write head, 410 opposite direction moves towards the center of circle with second speed to make track that read/write head following video disc 400.Wherein, the track of video disc 400 is to extend to the data field by the test section according to helical curve, and first speed and second speed are all uniform velocity.
In the present embodiment, the purpose of following the rail action is to be to guarantee read/write head when moving, and the radium-shine luminous energy of being launched correctly drops on the track of video disc 400.And this to follow rail action be the technology of utilizing industry known, for example use three-beam method (Three Beam Method), be to use a spectroscope, make the laser light that is radiated at video disc 400 can divide into a main spot and two secondary luminous points, and receive the reflected light of above-mentioned luminous point by the optical detector on the read/write head, the track that impels main spot following video disc 400 according to the volume reflection and the result of calculation thereof of above-mentioned two secondary luminous points advances or retreats.
Please get back to Fig. 4, next DVD drive will receive and handle the high frequency reflection signal (step 550) that is reflected by video disc 400, and the position accurate (step 560) of this high frequency reflection signal of identification.In general, the position standard of high frequency reflection signal is different high levels and the low level divided in zone that shine according to laser light.Fig. 6 is the longitudinal sectional drawing in the program internal memory zone of video disc, sees also Fig. 6, comprises flat region 610, flat region 630, flat region 650 in program internal memory zone 600, and hole district, hole 620 and hole district 640, hole.When laser light shines flat region (for example the flat region 610) on the program internal memory zone 600, reflection and the signal of high frequency reflection signal stronger, therefore be regarded as high levels; Otherwise, if laser light is when being hole, the hole district (for example cheating hole district 620) that shines on the program internal memory zone 600, the signal of the high frequency of reflection reflection signal a little less than, and be regarded as low level.
In another embodiment, a more catoptrical volume reflection and a default value can be compared, then high frequency be reflected signal and be considered as high levels if volume reflection is higher than default value; If volume reflection is lower than default value and then high frequency is reflected signal and be considered as low level.Wherein, this default value for example can be recorded in advance DVD drive ROM (read-only memory) (Read Only Memory, ROM) in.
Then, calculate that to pick out high frequency reflection signal for the first time be the time point (step 570) of low level.In the present embodiment, the time point that recognizes for the first time the high frequency reflection signal of low level is when occurring in read/write head and moving to first hole 420, hole of the inner ring of disk 400, for convenience of description, below puts with the very first time and to represent.
Next step then thus very first time point count, through the 3rd o'clock apart from after stopping mobile read/write head (step 580).Wherein, the mode that present embodiment calculates this 3rd o'clock distance comprises the frenquency signal that utilizes frequency circuit to produce, and this frenquency signal is made up of a plurality of identical cell frequencies.By of the comparison of high frequency reflection signal with frenquency signal, can calculate this 3rd o'clock apart from and cell frequency between relation (that is what cell frequencies were distance be equivalent in, the 3rd o'clock).What deserves to be mentioned is, the translational speed of read/write head (being second speed) is a uniform velocity in the present embodiment, therefore put from the very first time and stop time institute's elapsed time (having passed through what cell frequencies) as long as calculate read/write head, just can calculate read/write head and move how many distances altogether.
At last then by step motor traction read/write head, 410 direction moves towards the center of circle with second speed equally, move the 4th o'clock apart from after stop mobile read/write head (step 590).Present embodiment also comprises the frenquency signal that utilizes frequency circuit to produce, and in mobile read/write head, continues the cell frequency that adds up, up to the sum of cell frequency equal the 4th o'clock apart from the time, just stop mobile read/write head.And in the present embodiment, this the 4th o'clock apart from need greater than the 3rd o'clock distance, read/write head is moved to outside the data field of video disc guaranteeing, the 4th o'clock apart from need greater than the 3rd o'clock apart from one second to five seconds, usually can adjust the 4th o'clock distance according to the step motor form, that is to say that read/write head will rest on the white space that does not have storage data in the video disc 400, and can avoid being subjected to the interference in Zhong Keng hole, data field.In another embodiment, can be according to the output signal of known measurement step motor, the calculated step motor is put first number of turns of being rotated when stopping from the very first time, order step motor to turn round second number of turns again, second number of turns needs greater than the white space of first number of turns to guarantee that read/write head will rest on does not have storage data in the video disc 400.
Please get back to Fig. 3, after read/write head is moved to the white space of video disc, stop the action (step 320) of Spindle Motor rotating compact disc, and the laser light of first wavelength is shone on white space (step 330).
Then, measure laser light from the surface reflection of white space first o'clock distance to read/write head, and laser light from the reflective layer reflects of white space second o'clock to read/write head apart from (step 340), calculate first o'clock apart from the difference (step 350) of second o'clock distance, and this difference and reference value made comparisons, judge the kind (step 360) of video disc according to this, wherein this reference value for example is to be recorded in advance in the internal memory of DVD drive.
Video disc structure according to CD and DVD, when laser light shines white space in CD, first o'clock of reflecting in surface and reflection horizon apart from the difference of second o'clock distance will be greater than the white space that shines when laser light in DVD time the, the first o'clock distance that the surface of digital versatile disc and reflection horizon are reflected and the difference of second o'clock distance.Therefore, this difference is compared with reference value two, just can determine the video disc that places DVD drive at present is CD or DVD.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limiting the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (9)
1. a disc kind discrimination method is applicable to a DVD drive, and above-mentioned DVD drive comprises a read/write head, a Spindle Motor and a step motor, and is suitable for placing a video disc, it is characterized in that, above-mentioned disc kind discrimination method comprises the following steps:
A. move above-mentioned read/write head white space of storage data not to the above-mentioned video disc;
B. above-mentioned video disc stops the rotation;
C. a laser light that shines one first wavelength is in above-mentioned white space;
D. measure above-mentioned laser light from a surface reflection of above-mentioned white space one first o'clock distance to above-mentioned read/write head, and above-mentioned laser light from a reflective layer reflects of above-mentioned white space one second o'clock distance to above-mentioned read/write head;
E. calculate a time difference of above-mentioned first o'clock distance and above-mentioned second o'clock distance; And
F. relatively, judge the kind of above-mentioned video disc with above-mentioned time difference and a reference value.
2. according to 1 described disc kind discrimination method of claim the, it is characterized in that, wherein before above-mentioned steps a, more comprise:
Rotate above-mentioned Spindle Motor and continue a very first time, whether placed appropriate to measure above-mentioned video disc.
3. according to 1 described disc kind discrimination method of claim the, it is characterized in that wherein above-mentioned steps a comprises:
The center of circle direction of above-mentioned read/write head towards above-mentioned video disc moved, till above-mentioned read/write head reaches a dead-centre position;
Rotate above-mentioned video disc with one first speed;
Open above-mentioned read/write head to shine above-mentioned laser light to above-mentioned video disc;
Carry out following rail action, make above-mentioned read/write head follow a track and move toward an anti-center of circle direction with a second speed;
Receive and handle high frequency reflection signal by above-mentioned video disc reflection;
The above-mentioned high frequency reflection of identification signal is a high levels or a low level;
Calculate above-mentioned low level the initial very first time point that takes place;
By above-mentioned very first time point count through one the 3rd o'clock apart from after, stop to move above-mentioned read/write head; And
With above-mentioned second speed move above-mentioned read/write head and towards above-mentioned center of circle direction move one the 4th o'clock apart from after, stop to move above-mentioned read/write head, and above-mentioned the 4th o'clock apart from greater than above-mentioned the 3rd o'clock distance.
4. according to 3 described disc kind discrimination methods of claim the, it is characterized in that wherein the above-mentioned high frequency of identification reflection signal is that the mode of above-mentioned high levels or above-mentioned low level more comprises:
When shining above-mentioned laser light in a flat region, above-mentioned high frequency reflection signal is above-mentioned high levels, but when shining above-mentioned laser light in hole district, a hole, above-mentioned high frequency reflection signal is above-mentioned low level.
5. according to 3 described disc kind discrimination methods of claim the, it is characterized in that wherein above-mentioned dead-centre position is that above-mentioned read/write head can arrive the position in the center of circle of close above-mentioned video disc.
6. according to 3 described disc kind discrimination methods of claim the, it is characterized in that, wherein carry out the above-mentioned rail action of following, make above-mentioned read/write head follow above-mentioned track and more comprise toward the step that above-mentioned anti-center of circle direction moves with above-mentioned second speed:
Use a spectroscope, and above-mentioned laser light is shone when above-mentioned video disc, be divided into a main spot and two secondary luminous points, a plurality of reflected light of above-mentioned main spot and above-mentioned secondary luminous point throw the optical detector into above-mentioned read/write head, and the planned orbit that above-mentioned read/write head makes main spot follow above-mentioned video disc according to the volume reflection and the result of calculation thereof of above-mentioned secondary luminous point advances or retreats.
7. according to 6 described disc kind discrimination methods of claim the, it is characterized in that wherein the above-mentioned high frequency of identification reflection signal is that the mode of above-mentioned high levels or above-mentioned low level more comprises:
Comparing according to an above-mentioned catoptrical above-mentioned volume reflection and a default value, is above-mentioned high levels if above-mentioned volume reflection is higher than above-mentioned default value, is above-mentioned low level if above-mentioned volume reflection is lower than above-mentioned default value.
8. according to 3 described disc kind discrimination methods of claim the, it is characterized in that, wherein by above-mentioned very first time point count through above-mentioned the 3rd o'clock apart from after, the step that stops to move above-mentioned read/write head more comprises:
According to the frenquency signal that a frequency circuit produces, wherein the said frequencies signal comprises a plurality of same units frequencies, by the comparison of above-mentioned high frequency reflection signal with the said frequencies signal, calculates the relation of above-mentioned the 3rd o'clock distance and above-mentioned cell frequency.
9. according to 1 described disc kind discrimination method of claim the, it is characterized in that, the center of circle of approaching above-mentioned video disc, a test section of above-mentioned video disc wherein, one data field of above-mentioned video disc is positioned at the periphery of above-mentioned test section, one program internal memory zone of above-mentioned video disc is positioned at an outer peripheral areas of above-mentioned test section, above-mentioned white space is positioned at enclosing of said procedure region of memory, and a track of above-mentioned video disc extends to above-mentioned data field by above-mentioned test section according to a helical curve.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195857A (en) * | 1996-10-24 | 1998-10-14 | 三星电子株式会社 | Method for discriminating type of disc and digital versatile disc system adopting the same |
| CN1364292A (en) * | 2000-03-17 | 2002-08-14 | 松下电器产业株式会社 | Optical disc drive |
| CN1455405A (en) * | 2002-04-30 | 2003-11-12 | 三星电子株式会社 | Method and apparatus for identifying optical record medium type |
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2007
- 2007-02-14 CN CN2007100798219A patent/CN101246711B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1195857A (en) * | 1996-10-24 | 1998-10-14 | 三星电子株式会社 | Method for discriminating type of disc and digital versatile disc system adopting the same |
| CN1364292A (en) * | 2000-03-17 | 2002-08-14 | 松下电器产业株式会社 | Optical disc drive |
| CN1455405A (en) * | 2002-04-30 | 2003-11-12 | 三星电子株式会社 | Method and apparatus for identifying optical record medium type |
Non-Patent Citations (1)
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