CN1447313A - Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle - Google Patents
Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle Download PDFInfo
- Publication number
- CN1447313A CN1447313A CN03121945A CN03121945A CN1447313A CN 1447313 A CN1447313 A CN 1447313A CN 03121945 A CN03121945 A CN 03121945A CN 03121945 A CN03121945 A CN 03121945A CN 1447313 A CN1447313 A CN 1447313A
- Authority
- CN
- China
- Prior art keywords
- recording layer
- multistage
- different
- depth
- optical disk
- 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)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
A multistage optical storage method and multistage read-only optical disk structure characterizes in that the said storage method is that after the line polarized incident light passess through a recording layer, its polarized state changes, utilizing record pool dots of different depths on the recording layer to make the incident light to pass through the routes in different lengths on the recording layer and get different reflecting light polarized states to be detected to get multistage signals expressing different depth of the dots to operate on the multistage disk storage and get storage effect over 16 stages by interference detection method.
Description
Technical field
The present invention relates to a kind of multistage optical storage method and multistep read-only optical disk structure, belong to optical disc storage based on the birefringence principle
Technical field.
Background technology
It is present that CD storage technique adopted is the two-value storage mode, as in CD-ROM, according to the height of reflected light light intensity judge current pairing position be " hole " (Pit) or " bank " (Land), can write down two status numbers on each record cell, just the information of just in time corresponding 1 (bit).Different with traditional two-value storage mode is, in multistage storage, the status number that can write down on each record cell is more than two, and just the information that can write down is more than 1 (bit), thereby under the constant situation of record cell number, improve storage density and memory capacity significantly.
Under the prerequisite that adopts identical LASER Light Source, numerical aperture of objective and recording medium, compare with common two-value storage mode, if can write down the information on n rank on the onesize record cell, the total volume C of n rank storage roughly can calculate as follows so:
C＝C
n·log
2n(n＞2)
C in the formula
nIt is the storage total volume when adopting common two-value storage mode.Illustrate, if n=8, i.e. 8 rank storage, its capacity will be 3 times of common two-value storage.
The example of the most basic multistep read-only optical disk storage is the multistage scheme of the dark modulation in hole, is called PDM (Pit-DepthModulation) again.Its principle is, CD for read-only class, according to scalar diffraction theory, the record pit point degree of depth of catoptrical light intensity and CD has corresponding relation: from cheating is 0 deeply, along with the dark increase in hole, catoptrical light intensity weakens thereupon, is 1/4 place of optical maser wavelength deeply in the hole, and the reflected light light intensity reaches minimal value.Utilize this relation of the record pit point degree of depth and reflective light intensity, different holes has been set changes deeply, can realize the multi-stage optical disk storage.Yet because the resolution limit problem of the hole point degree of depth, the multistage storage effect that this scheme can reach is very limited.
Summary of the invention
The object of the present invention is to provide a kind of storage capacity big, store effective multistage optical storage method and read-only optical disc structure based on the birefringence principle, this CD uses birefringent material as recording medium, on CD, form the different hole point of the degree of depth, the characteristic of utilizing polarized light to change by birefringent material rear polarizer state realizes the high density compact disc storage.
A kind of multistage optical storage method that the present invention proposes based on the birefringence principle, it is characterized in that, described storage means is after the incident light of linear polarization passes through recording layer, its polarization state changes, and utilizes the record pit point of different depth on the recording layer, makes the path difference of incident light process in recording layer, obtain different reflected light polarization states, the different polarization state of detection of reflected light obtains reflecting and the multistage signal of the different recording hole point degree of depth can carry out the multi-stage optical disk storage.
In multistage optical storage method of the present invention, described reflected light is in the some degree of depth 1 mu m range of hole, and the variation range of the phase differential of two orthogonal polarization components is 0～pi/2.
The multistep read-only optical disk structure that the present invention proposes based on the birefringence principle, it contains dish base, recording layer, reflection horizon, protective seam, it is characterized in that, and described compact disk structure contains closely folded mutually successively following each layer:
(1) dish base: whole disc is played support and protective effect, also is the plane of incidence of laser;
(2) recording layer: be positioned on the dish base, the different hole point of the degree of depth is arranged on the recording layer, be used to store multistage data;
(3) reflection horizon: be positioned on the recording layer, be used to reflect incident optical signal;
(4) protective seam: be positioned on the reflection horizon, be used to protect reflection horizon and recording layer.
In above-mentioned multistep read-only optical disk structure, described recording layer is the recording layer that is formed by birefringent material.
A kind of multistage optical storage method and read-only optical disc structure proposed by the invention based on the birefringence principle, the characteristic of utilizing polarized light to change by birefringent material rear polarizer state, can realize surpassing the multistage storage on 8 rank, improve capacity of optical storage greatly.Experiment showed, that the phase differential of catoptrical two orthogonal polarization components approximately can reach the variation range of 0～pi/2 within the hole point change in depth scope of about 1 μ m.Utilize and interfere the method that detects, can obtain the above storage effect in 16 rank.Compare with the traditional two-value storage mode under the same terms, its memory capacity improves greatly, can reach 3～4 times of similar CD.
Description of drawings
Fig. 1 is a birefringence principle schematic of the present invention.
Fig. 2 is the multistep read-only optical disk synoptic diagram that the present invention is based on the birefringence principle.
Fig. 3 is the 4 rank read-only optical disc synoptic diagram based on the birefringence principle of the embodiment of the invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples:
The present invention has utilized birefringence principle and polarization effect.Any two orthogonal components phase places of a branch of polarized light are correlated with, and its phase differential has determined this polarized state of light.If a branch of incident polarized light is by one deck birefringent material, will along former direction propagate two bundle quadratures linearly polarized light---o light and e light, its refractive index is respectively n
oAnd n
e, as shown in Figure 1.Because o light is different with the refractive index of e light, be the birefringent material of d by thickness after, will produce certain phase difference , and
λ is the wavelength of incident polarized light in the formula.So incident polarized light 1 is by behind the birefringent material 2, owing to added a phase differential between two polarized components of its quadrature, the outgoing polarized state of light will change.For example, be changed to elliptically polarized light 3 from linearly polarized light 1, as shown in Figure 1.
In multistage optical storage method proposed by the invention, the incident laser that is used for reading of data is a linearly polarized light, behind incident light the record pit point and reflection different by the degree of depth, because record pit point is formed by birefringent material, the polarization of reflected light attitude will change, and the linear ratio of the degree of depth of variable quantity and record pit point.By the different polarization state of detection of reflected light, can obtain reflecting the multistage signal of the different recording hole point degree of depth, thereby realize the multi-stage optical disk storage.
The detailed structure of multistep read-only optical disk proposed by the invention as shown in Figure 2.
Multi-stage optical disk based on the birefringence principle proposed by the invention is a read-only.Its method for making can be continued to use traditional mould pressing method: utilize the multistage mother CD burning technology of high precision, the employing press moulding mode produces the record pit point on this multi-stage optical disk, thereby obtains multistep read-only optical disk.
Multistep read-only optical disk for the present invention's proposition based on the birefringence principle, when reading CD institute canned data, the linearly polarized light 4 of incident vertically enters CD from coiling basic 5 directions, after entering recording layer 6, the polarization of incident light state begins to change, become elliptically polarized light, produce phase differential between the linear polarization component of its pairwise orthogonal, and phase differential is directly proportional with incident light path of process in recording layer.And the record pit point degree of depth has directly determined the path of incident light process in recording layer.Incident light becomes reflected light arriving 180 ° of directions of reflection horizon 7 back changes.Reflected light returns and penetrates from recording layer along former travel path of incident light.The phase differential of two orthogonal polarization components by detection of reflected light can obtain the information of the record pit point degree of depth.
Among Fig. 28 is the protective seam of read-only optical disc, and 9 is multistage record pit point.
Embodiment
Specifically introduce content of the present invention by embodiment, but that content of the present invention is not subject to embodiment is described:
As shown in Figure 3 be 4 rank read-only optical discs based on the birefringence principle.Wherein 10 is incident laser, and 11 is reflector laser.12 are the dish base, and 13 is recording layer, and 14 is the reflection horizon, and 15 is protective seam.
Have 4 kinds of hole points that the degree of depth is different in this 4 rank read-only optical disc, use ' 0 ', ' 1 ', ' 2 ' respectively, ' 3 ' represents.Wherein the degree of depth of ' 0 ' expression hole point is 0, does not promptly cheat the place of point; And the different hole dot information of ' 1 ', ' 2 ', ' 3 ' the corresponding depth of difference.The memory capacity of this 4 rank read-only optical disc is about the twice of common two-value stored CD under the similarity condition.
Claims (4)
1, based on the multistage optical storage method of birefringence principle, it is characterized in that, described storage means is after the incident light of linear polarization passes through recording layer, its polarization state changes, and utilizes the record pit point of different depth on the recording layer, makes the path difference of incident light process in recording layer, obtain different reflected light polarization states, the different polarization state of detection of reflected light obtains reflecting and the multistage signal of the different recording hole point degree of depth can carry out the multi-stage optical disk storage.
2, the multistage optical storage method based on the birefringence principle according to claim 1 is characterized in that, described reflected light is in the some degree of depth 1 mu m range of hole, and the variation range of the phase differential of two orthogonal polarization components is 0～pi/2.
3, the multistep read-only optical disk structure based on the birefringence principle according to claim 1, it contains dish base, recording layer, reflection horizon, protective seam, it is characterized in that, and described compact disk structure contains closely folded mutually successively following each layer:
(1) dish base: whole disc is played support and protective effect, also is the plane of incidence of laser;
(2) recording layer: be positioned on the dish base, the different hole point of the degree of depth is arranged on the recording layer, be used to store multistage data;
(3) reflection horizon: be positioned on the recording layer, be used to reflect incident optical signal;
(4) protective seam: be positioned on the reflection horizon, be used to protect reflection horizon and recording layer.
4, the multistep read-only optical disk structure based on the birefringence principle according to claim 3 is characterized in that, described recording layer is the recording layer that is formed by birefringent material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031219454A CN1212614C (en) | 2003-04-18 | 2003-04-18 | Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031219454A CN1212614C (en) | 2003-04-18 | 2003-04-18 | Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1447313A true CN1447313A (en) | 2003-10-08 |
| CN1212614C CN1212614C (en) | 2005-07-27 |
Family
ID=28050553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031219454A Expired - Fee Related CN1212614C (en) | 2003-04-18 | 2003-04-18 | Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1212614C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543110A (en) * | 2012-02-24 | 2012-07-04 | 华中科技大学 | Multi-dimensional optical storage disc and data read-out method thereof |
| CN111199753A (en) * | 2018-11-20 | 2020-05-26 | 中国科学院上海高等研究院 | Optical disk read-write method based on nano photoetching and write control information coding and decoding method |
| CN111508534A (en) * | 2019-01-30 | 2020-08-07 | 中国科学院上海高等研究院 | Polarization balance measurement reading method and device based on nano photoetching optical disk |
| CN111696588A (en) * | 2020-05-08 | 2020-09-22 | 华中科技大学 | Optical storage method and system based on fused quartz fluorescent signal |
-
2003
- 2003-04-18 CN CNB031219454A patent/CN1212614C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102543110A (en) * | 2012-02-24 | 2012-07-04 | 华中科技大学 | Multi-dimensional optical storage disc and data read-out method thereof |
| CN102543110B (en) * | 2012-02-24 | 2015-07-08 | 华中科技大学 | Multi-dimensional optical storage disc and data read-out method thereof |
| CN111199753A (en) * | 2018-11-20 | 2020-05-26 | 中国科学院上海高等研究院 | Optical disk read-write method based on nano photoetching and write control information coding and decoding method |
| CN111508534A (en) * | 2019-01-30 | 2020-08-07 | 中国科学院上海高等研究院 | Polarization balance measurement reading method and device based on nano photoetching optical disk |
| CN111696588A (en) * | 2020-05-08 | 2020-09-22 | 华中科技大学 | Optical storage method and system based on fused quartz fluorescent signal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1212614C (en) | 2005-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR20000064459A (en) | Double layer optical media with partial reflecting alloy layer | |
| CA2375620C (en) | Protecting film for optical recording medium and optical recording medium | |
| US8503279B2 (en) | Six-dimensional optical storage method and apparatus | |
| MY104845A (en) | Optical recorded medium | |
| TW200501106A (en) | Optical recording medium and record reproduction method and manufacturing method thereof | |
| CN1632868A (en) | Device for reading from or writing to an optical recording | |
| US5121376A (en) | Optical disk memory using multi-level data recording | |
| CN1212614C (en) | Method of multi module optical storage and structure of multi module read-only optical disk based on birfringence principle | |
| CN102543110B (en) | Multi-dimensional optical storage disc and data read-out method thereof | |
| JP2001517351A (en) | Two-layer optical storage medium having a partially reflective layer containing amorphous selenium | |
| CN1855254B (en) | Optical pickup apparatus | |
| JPS63107589A (en) | Optical recording medium | |
| CN100543847C (en) | Holographic memory device with homodyne detection | |
| CN1319060C (en) | Pick-up apparatus for digital storage medium | |
| CN1647167A (en) | Optical data storage medium and use of such medium | |
| CN111508533A (en) | Nano photoetching-based optical disk and physical storage medium structure and writing and reading method thereof | |
| US6078558A (en) | Optical recording medium having two superimposed recording levels and corresponding recording device and reading process | |
| CN1107945C (en) | 3D multi-colour storing optical head | |
| JPH04142981A (en) | Optical recording medium | |
| JPH05120727A (en) | Optical recording medium and method for recording or reproducing information to or from this medium | |
| US20090046559A1 (en) | Holographic information storage medium, and method and apparatus for recording/reproducing holographic information using the same | |
| JP2007527080A (en) | Recordable optical record carrier | |
| US20030161256A1 (en) | Optical disk | |
| Kobayashi et al. | Multi-Layered Optical Storage with Nonlinear Read/Write | |
| CA2804676A1 (en) | Six-dimensional multilayer optical storage device |
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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050727 Termination date: 20100418 |