CN1264110A - Digital colour multi-layer multi-order write-in/read-out method for optical disk - Google Patents
Digital colour multi-layer multi-order write-in/read-out method for optical disk Download PDFInfo
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- CN1264110A CN1264110A CN 00103501 CN00103501A CN1264110A CN 1264110 A CN1264110 A CN 1264110A CN 00103501 CN00103501 CN 00103501 CN 00103501 A CN00103501 A CN 00103501A CN 1264110 A CN1264110 A CN 1264110A
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Abstract
A write-in/read-out method of optical disk for increasing the storage capacity and write/read speed includes such steps as preparing optical disk with n record layers, rotating the optical disk to make its n record layers always in the focus depth of object lens, moving object lens to the channel of target sector, writing in n-channel data with laser device, said n laser beams pass-through chromatism-eliminating object lens and disc base and then are focused onto n record layers of optical disk, radially moving ojbect lens along optical disk, reading the format code of each sector, and reading out data of n record layers.
Description
The present invention relates to a kind of digital colour multi-layer multi-stage optical disk and write and reading method, belong to field of optical storage technology.
Optical storage is one of present main information storage means.The growth at full speed of quantity of information has proposed more and more higher requirement to optical storage on capacity and speed.The effective ways that improve optical storage capacity are the dimensions that increase storage, increase capacity as DVD-ROM by the method that increases recording layer, and its principle as shown in Figure 1.Single-surface double-layer DVD disc is made up of last recording layer 1, semi-transparent semi-reflecting layer 2, following recording layer 3, reflection horizon 4, protective seam 5 and thickness compensation dish 6, and data are recorded on recording layer 1 and the following recording layer 3, as shown in Figure 1 by the method for mold pressing.The reflectivity of semi-transparent semi-reflecting layer 2 is about 30%, and the reflectivity in reflection horizon is greater than 70%.When reading recording layer 1, light beam focuses on recording layer 1 and by semi-transparent semi-reflecting layer 2 reflection, detector is handled the light intensity of folded light beam, obtains record data and servosignal.When reading down recording layer 2, object lens are moved down, the semi-transparent semi-reflecting layer 2 of a part of light transmission focuses on down recording layer 3 and layer 4 reflection that are reflected, and the part of folded light beam is detected device through semi-transparent semi-reflecting layer 2 and receives, and is used for producing servosignal and read output signal.This method has following shortcoming:
1, disc manufacturing process complexity.Mold pressing needs recording layer 3 under the mold pressing thereon again after going up recording layer 1 well and plating semi-transparent semi-reflecting layer 2, and destroy easily and go up recording layer 1 this moment, causes the yield rate of disc low, can not increase the number of plies again.
2, this method record number of plies can not be too many.Because to each recording layer, all need to increase corresponding reflecting layers and touch the pressure layer, read output signal is sharply weakened, for example present used dual layer discs, the reflectivity in the reflection horizon on the ground floor is 30%, then signal amplitude is not as good as 1/3 of initial value.
The objective of the invention is on the basis that makes full use of existing CD storage technique and scale production technology means, provide a kind of simple in structure and can with the high capacity of existing CD compatibility and the optical storage method of high data transmission rate.
The method for writing data of the digital colour multi-layer multi-stage optical disk that the present invention proposes may further comprise the steps:
1, CD of preparation, at first make optical disk substrate with the method for mold pressing, n recording layer of plating on the dish base, each recording layer is a kind of photochromic material, at the outside of n recording layer plating total reflection layer, the gross thickness of the n of a CD recording layer has channel less than the depth of focus of object lens on the dish base, and channel is divided into a plurality of sectors, beginning of each sector is the sector format sign indicating number, be used for identifying this sector, the form type code back is the data field, is used for storing data;
2, rotary CD is adjusted the position of object lens up and down, allows n recording layer of CD be positioned within the depth of focus of object lens, and in following steps, n recording layer of CD is positioned within the depth of focus of object lens all the time;
3,, object focal point is positioned on the CD channel along the mobile slightly object lens of disc radial direction; Read the form type code of a sector on the channel, calculate this sector and the distance that writes the target sector at data place; Then along CD radially make the object lens mobile phase with distance, allow object focal point arrive the channel at above-mentioned target sector place;
4, will write data decomposition and become the n road, every circuit-switched data is write by a laser instrument, and the Wavelength of Laser that each laser instrument sends is different, is respectively λ
i(i=1,2,, n), along with the rotation of CD, read form type code through each sector of object focal point, wait for above-mentioned target sector through object focal point, when the data storage areas of above-mentioned target sector during through overfocus, according to the said n routes data, make n laser instrument send the time dependent laser beam of intensity respectively, the light intensity of each laser beam all has m value I
Il(l=1,2 ..., m), so each recording layer all is the storages of m rank;
5, focus on n the recording layer of CD behind said n Shu Jiguang process object lens, the dish base, object lens are achromatic objective, make the different n of wavelength restraint laser focusing in same point, because n recording layer all is positioned within the object lens depth of focus, rotation along with CD, the n circuit-switched data is written into n recording layer of CD respectively, and object focal point remains on the channel at above-mentioned target sector place, finishes up to data writing process
The data read method of the digital colour multi-layer multi-stage optical disk that the present invention proposes may further comprise the steps:
1, rotary CD is adjusted the position of object lens up and down, allows n recording layer of CD be positioned within the depth of focus of object lens;
2, move object lens along disc radial direction, object focal point is positioned on the CD channel; Read the form type code of a sector on the channel, calculate the distance between the target sector at this sector and sense data place; Along the object lens that move radially of CD, allow object focal point arrive the channel at above-mentioned target sector place then;
3, along with the rotation of CD, read form type code through each sector of object focal point, wait for that above-mentioned target sector is through object focal point, when above-mentioned target sector during through overfocus, light n semiconductor laser, make them send the different wavelength of laser bundle, the wavelength of laser beam is respectively λ
i(i=1,2 ..., n), each intensity of laser beam I
iDo not change in time, this intensity is less than the photochromic reactions threshold value A of any photochromic material in the n kind photochromic material on the CD
i
4, focus on n the recording layer of CD behind said n Shu Jiguang process object lens, the dish base, object lens are achromatic objective, make the different n of wavelength restraint laser focusing in same point, owing to n recording layer all is positioned within the object lens depth of focus, so the laser of n kind wavelength can be absorbed by n recording layer respectively;
5, after said n Shu Jiguang is absorbed by n recording layer respectively, reflected by total reflection layer, enter n detector through behind the object lens again, this n detector receives the laser of n kind wavelength respectively, detect the light intensity of n kind wavelength laser, change the data of reading n recording layer according to light intensity, object focal point remains at the channel at above-mentioned target sector place, finishes up to the data readout.
Method of the present invention can increase capacity of optical storage effectively.If single recording layer has C channels bits, if adopt conventional individual layer two-value storage, then the capacity of CD is the C bit; If adopt the storage of n layer m of the present invention rank, then CD capacity reaches nClog
2The m bit.
The outstanding advantage of another one of the present invention is the speed that has improved reading and writing data.Speed and capacity are two very important indexs of storage system, but general method is difficult to significantly improve simultaneously this two indexs.Adopt multilayer technique to improve the capacity of CD as dvd system, it carries out reading separately of each layer data of CD, so its reading speed and useless significantly improving.In the present invention, with an achromatic objective n is restrainted laser focusing in a focus, and n recording layer be entirely within the depth of focus of this focus, therefore the read-write to n recording layer is to walk abreast simultaneously.Under the identical situation of CD speed, read or write speed of the present invention is the nlog to individual layer two-value CD read and write speed
2M doubly.
A plurality of recording layer concurrent reading and concurrent writings not only can improve data write speed, and can carry out the interlayer coding.The interlayer coding not only can improve code rate, also can reduce redundant data, further raising dish capacity.
Brief Description Of Drawings:
Fig. 1 is the reading and writing data schematic diagram of prior art.
Fig. 2 is a reading and writing data schematic diagram of the present invention.
Below in conjunction with accompanying drawing, introduce in detail the principle of content of the present invention and institute's foundation. Among Fig. 1 and Fig. 2, the 1st, upper record Layer, the 2nd, semi-transparent semi-reflecting layer, the 3rd, lower recording layer, the 4th, total reflection layer, the 5th, protective layer, the 6th, the thickness compensation dish, 71～7n is n laser instrument, the 8th, and the laser beam merging device, the 9th, condenser, the 10th, diffraction grating, 111～11n are n detections Device, the 12nd, laser beam merging device, the 13rd, polarized light splitting device, the 14th, quarter wave plate, the 15th, achromatic objective, the 16th, dish Base, 171～17n are n recording layers, the 18th, and reflecting layer 19 is protective layers.
The n of CD of the present invention recording layer 171～17n is made up of the different photochromic material of n kind, to these records The read-write of layer is finished by n laser instrument 71～7n and n detector 111～11n. For the read-write that each recording layer is described former Reason, with these recording layers, photochromic material, laser instrument and detector serial number, in the reading and writing data process, note Record layer, photochromic material, laser instrument and detector are mutually one by one corresponding, and namely recording layer i is made up of photochromic material i, Its read-write is finished by laser instrument i and detector i. The wavelength of the laser that laser instrument i sends is λi, the absorbing wavelength of photochromic material i is λi, it is λ to wavelengthj(j ≠ i, j=1,2 ..., optical transparency n). When wavelength is λiLaser Focusing to light The dish n recording layer the time, only have recording layer i can absorb the energy of this laser, other recording layer is fully transparent to this laser. If the light intensity I of this laseriLess than certain threshold value Ai, then recording layer i only absorbs the energy of this laser, makes the strong of this laser Degree weakens, and photochromic reactions does not take place material itself. Recording layer i depends on this to the power of the absorption of this laser The amount of photochromic material i in the recording layer, photochromic material i is more many, and absorption is more strong, and photochromic material i is more few Absorption is more weak. If the light intensity I of this laseriGreater than certain threshold value Ai, then recording layer i absorbs the energy rear section photochromic material i generation photochromic reactions of this laser, and amount and this laser intensity I of the material of photochromic reactions take placeiSize relevant, IiThe more big photochromic material that reacts is more many, and remaining photochromic material is more few, IiMore little generation The photochromic material of reaction is more few, and remaining photochromic material is more many. With above-mentioned threshold value AiBe called photochromic material i The metachromasia threshold value.
Wavelength is λiLaser Focusing during to n recording layer of CD, m different laser intensity value Iil(l=1,2 ..., m) make m the distinguishable value B of measuring of remaining photochromic material among the recording layer iil, this m value BilCan be used for The storage of m rank. When reading, be λ with wavelengthiAnd intensity IiLess than the metachromasia threshold value AiLaser Focusing to n note of CD On the record layer, this laser is reflected by total reflection layer 18 through behind n recording layer. Photochromic material among the recording layer i Amount is different, and the intensity of the light beam that reflects is just different, and detector i determines among the recording layer i according to the light intensity value of folded light beam Data.
The light that the photochromic reactions product of said n kind photochromic material sends n laser instrument all is transparent, not shadow Ring the read-write to any material.
Because the central ray of the laser beam that n laser instrument sends does not overlap, before entering main optical path, the present invention is with one Laser beam merging device 8 overlaps the central ray of n bundle laser. Similarly, after Returning beam leaves main optical path, according to light The road principle of reversibility is separated into n bundle laser with a same laser beam merging device with Returning beam, enters respectively n detection Device.
The object lens 15 that the present invention uses are a kind of achromatic objectives. These object lens are for the laser dephasing of said n kind wavelength, So that the collimated laser beam of this n kind wavelength focuses on a bit.
In the data reading process, and from the 2nd step of data writing process, needs ceaselessly be adjusted up and down object lens The position allows n recording layer of CD be positioned within the depth of focus of object lens, and this task is finished by automatic focusing system. Have a lot Method can realize automatic focusing, as allowing a collimated laser beam through object lens, dish base and recording layer, by total reflection layer Reflect, return through behind the object lens again. If the focus of object lens just in time is positioned on n the recording layer of CD, then return Light beam is collimated light beam; If the focus of object lens is positioned at the top of n recording layer of CD, it then is convergent beam; If The focus of object lens is positioned at the below of n recording layer of CD, and then Returning beam is divergent beams. By the observation Returning beam Be parallel, convergence or divergent beams, can keep respectively, mobile object lens downward or upward, until that Returning beam becomes is flat The row light beam is till namely object focal point just in time is positioned on n the recording layer of CD. N the laser that automatic focusing system uses In the device one is such as laser instrument k. It should be noted that this laser instrument sends before the 5th step of data writing process Laser intensity is less than the metachromasia threshold value A of photochromic material kk。
After the 3rd step of data writing process, and after the 2nd step of data reading, need to allow object focal point remain on letter On the road, this task is finished by automatic tracking system. Automatic tracking system is used in n the laser instrument, such as laser instrument j. When object focal point departs from channel, laser that laser instrument j sends through object lens, dish base, a n recording layer after by total reflection layer Reflect, if object focal point has departed from channel, then the light intensity of Returning beam with the position mutually distribution can change, accordingly Can along the slightly mobile object lens of disc radial direction, allow object focal point get back on the channel. It should be noted that at data writing process The 5th the step before, the laser intensity that this laser instrument sends is less than the metachromasia threshold value A of photochromic material jj Automatically The laser instrument of tracking system and automatic focusing system use can be identical, also can be different.
Introduce embodiments of the invention below.
Numeral 4 wavelength 4 rank data of optical disk reading/writing methods.4 kinds of wavelength that adopt are respectively 680nm, 630nm, 550nm and 480nm.The numerical aperture of achromatic objective is 0.6, and depth of focus is 1 μ m.Optical disk substrate is made up of organic plastics, and thickness is 0.6mm, above mold pressing channel and sector format sign indicating number are arranged.Total reflection layer is the aluminium film, and its reflectivity is more than 70%.
4 kinds of photochromic materials are the different spiro-pyrans of absorption band, and absorption peak is respectively 680nm, 630nm, 550nm and 480nm, and the width of absorption band is very narrow.4 kinds of photochromic materials the photochromic reactions product all be transparent to the laser of above-mentioned 4 kinds of wavelength.Plate 4 kinds of photochromic materials successively as 4 recording layers on the dish base, every layer thickness is 50nm.Object lens are to above-mentioned 4 kinds of wavelength achromatisms, and depth of focus is 1 μ m.
4 kinds of their molecular structure difference of photochromic material are little, except that the absorption peak difference, and other photochemical properties basically identical.When photochromic reactions did not take place, reflectivity was 20%, and after all photochromic reactions taking place, reflectivity is about 60%.In the regular hour, the threshold value of photochromic reactions is about 2.5mW, when the intensity that writes laser is 0mW, 4mW, 9mW and 15mW, can make emissivity be respectively 20%, 33%, 47% and 60%, represent 4 kinds of states of 4 rank storage respectively: " 00 ", " 01 ", " 10 ", " 11 ".When reading, laser intensity is 1.5mW.
Automatic focusing system and automatic tracking system are all used the laser of 480nm, and its work light intensity is 1.5mW.In data writing process, the laser of the intensity that writes data demand laser actual use 1.5mW when being 0mW is to guarantee that automatic focusing and automatic tracking system still can operate as normal.Because 1.5mW still less than threshold value 2.5mW, writes data and is still correct.
The storage of 4 wavelength, 4 rank can be brought up to 8 times that the individual layer two-value is stored with capacity and speed.
Claims (2)
1, a kind of method for writing data of digital colour multi-layer multi-stage optical disk is characterized in that this method may further comprise the steps:
(1), CD of preparation, at first make optical disk substrate with the method for mold pressing, n recording layer of plating on the dish base, each recording layer is a kind of photochromic material, at the outside of n recording layer plating total reflection layer, the gross thickness of the n of a CD recording layer has channel less than the depth of focus of object lens on the dish base, and channel is divided into a plurality of sectors, beginning of each sector is the sector format sign indicating number, be used for identifying this sector, the form type code back is the data field, is used for storing data;
(2), rotary CD, adjust the position of object lens up and down, allow n recording layer of CD be positioned within the depth of focus of object lens, and in following steps, n recording layer of CD be positioned within the depth of focus of object lens all the time;
(3), along the mobile slightly object lens of disc radial direction, object focal point is positioned on the CD channel; Read the form type code of a sector on the channel, calculate this sector and the distance that writes the target sector at data place; Then along CD radially make the object lens mobile phase with distance, allow object focal point arrive the channel at above-mentioned target sector place;
(4), will write data decomposition and become the n road, every circuit-switched data is write by a laser instrument, the Wavelength of Laser that each laser instrument sends is different, is respectively λ
i(i=1,2,, n), along with the rotation of CD, read form type code through each sector of object focal point, wait for above-mentioned target sector through object focal point, when the data storage areas of above-mentioned target sector during through overfocus, according to the said n routes data, make n laser instrument send the time dependent laser beam of intensity respectively, the light intensity of each laser beam all has m value I
Il(l=1,2 ..., m), so each recording layer all is the storages of m rank;
(5), focus on n the recording layer of CD behind said n Shu Jiguang process object lens, the dish base, object lens are achromatic objective, make the different n of wavelength restraint laser focusing in same point, because n recording layer all is positioned within the object lens depth of focus, rotation along with CD, the n circuit-switched data is written into n recording layer of CD respectively, and object focal point remains on the channel at above-mentioned target sector place, finishes up to data writing process
2, a kind of data read method of digital colour multi-layer multi-stage optical disk is characterized in that this method may further comprise the steps:
(1), rotary CD, adjust the position of object lens up and down, allow n recording layer of CD be positioned within the depth of focus of object lens;
(2), move object lens, object focal point is positioned on the CD channel along disc radial direction; Read the form type code of a sector on the channel, calculate the distance between the target sector at this sector and sense data place; Along the object lens that move radially of CD, allow object focal point arrive the channel at above-mentioned target sector place then;
(3), along with the rotation of CD, read form type code through each sector of object focal point, wait for that above-mentioned target sector is through object focal point, when above-mentioned target sector during through overfocus, light n semiconductor laser, make them send the different wavelength of laser bundle, the wavelength of laser beam is respectively λ
i(i=1,2 ..., n), each intensity of laser beam I
iDo not change in time, this intensity is less than the photochromic reactions threshold value A of any photochromic material in the n kind photochromic material on the CD
i
(4), focus on n the recording layer of CD behind said n Shu Jiguang process object lens, the dish base, object lens are achromatic objective, make the different n of wavelength restraint laser focusing in same point, because n recording layer all is positioned within the object lens depth of focus, so the laser of n kind wavelength can be absorbed by n recording layer respectively;
(5), after said n Shu Jiguang is absorbed by n recording layer respectively, reflected by total reflection layer, enter n detector through behind the object lens again, this n detector receives the laser of n kind wavelength respectively, detect the light intensity of n kind wavelength laser, change the data of reading n recording layer according to light intensity, object focal point remains at the channel at above-mentioned target sector place, finishes up to the data readout.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00103501 CN1108605C (en) | 2000-03-24 | 2000-03-24 | Digital colour multi-layer multi-order write-in/read-out method for optical disk |
| US09/810,948 US20010038596A1 (en) | 2000-03-17 | 2001-03-16 | Multi-wavelength optical disc, apparatus and method for reading and writing signal therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00103501 CN1108605C (en) | 2000-03-24 | 2000-03-24 | Digital colour multi-layer multi-order write-in/read-out method for optical disk |
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| Publication Number | Publication Date |
|---|---|
| CN1264110A true CN1264110A (en) | 2000-08-23 |
| CN1108605C CN1108605C (en) | 2003-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00103501 Expired - Fee Related CN1108605C (en) | 2000-03-17 | 2000-03-24 | Digital colour multi-layer multi-order write-in/read-out method for optical disk |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362583C (en) * | 2004-07-16 | 2008-01-16 | 精碟科技股份有限公司 | Composite type CD-R and its manufacturing method |
| CN100452201C (en) * | 2004-07-16 | 2009-01-14 | 精碟科技股份有限公司 | Double-sided type CD-R and its manufacturing method |
| CN113380278A (en) * | 2018-11-20 | 2021-09-10 | 中国科学院上海高等研究院 | Optical disk reading method, reading device and optical disk reading and writing device based on nano photoetching |
-
2000
- 2000-03-24 CN CN 00103501 patent/CN1108605C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362583C (en) * | 2004-07-16 | 2008-01-16 | 精碟科技股份有限公司 | Composite type CD-R and its manufacturing method |
| CN100452201C (en) * | 2004-07-16 | 2009-01-14 | 精碟科技股份有限公司 | Double-sided type CD-R and its manufacturing method |
| CN113380278A (en) * | 2018-11-20 | 2021-09-10 | 中国科学院上海高等研究院 | Optical disk reading method, reading device and optical disk reading and writing device based on nano photoetching |
| CN113380278B (en) * | 2018-11-20 | 2023-03-31 | 中国科学院上海高等研究院 | Optical disk reading method, reading device and optical disk reading and writing device based on nano photoetching |
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| CN1108605C (en) | 2003-05-14 |
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