CN1133161C - High-density read-only optical disk - Google Patents
High-density read-only optical disk Download PDFInfo
- Publication number
- CN1133161C CN1133161C CN98106232A CN98106232A CN1133161C CN 1133161 C CN1133161 C CN 1133161C CN 98106232 A CN98106232 A CN 98106232A CN 98106232 A CN98106232 A CN 98106232A CN 1133161 C CN1133161 C CN 1133161C
- Authority
- CN
- China
- Prior art keywords
- dvd
- data
- groove
- session
- track
- 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.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24076—Cross sectional shape in the radial direction of a disc, e.g. asymmetrical cross sectional shape
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0938—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following servo format, e.g. guide tracks, pilot signals
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24073—Tracks
- G11B7/24079—Width or depth
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
- G11B7/261—Preparing a master, e.g. exposing photoresist, electroforming
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B2007/00709—Dimensions of grooves or tracks, e.g. groove depth, track pitch
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B2007/00754—Track shape, e.g. address or synchronisation information in wobbled track or sidewall
Abstract
A high-density read-only optical disk. In the optical disk, plural grooves continuously forms a waveform manner along each track, providing plural information pits to the grooves and making possible to reproduce the information from the track pits which are narrower than the track pits of the optical disk having only information pits for every track.
Description
Technical field
The present invention relates to a kind of be used on CD reads the optical disk system of these data with pit mode recording digital audio and video data and with laser beam, in particular to a kind of read-only optical disc with the substrate surface structure that is used to improve data recording density.
Background technology
Optical recording with read in the technology, data reading from the CD utilizes a laser beam to finish according to the difference of intensity of reflected light.Catoptrical intensity changes, and that is to say that the record of data on CD with regard to general CD (CD) or DVD (digital video disk), is by utilizing the optical interference between pit and the reference planes to finish; With regard to magneto-optic disk, this record is to finish by the yawing moment that changes the magneto-optical recorder material; With regard to phase change disc, be to finish, or with regard to CD-R (read/writable compact disk system), be to finish by the variation of organic pigment by the difference of the catoptrical intensity relevant with the recording materials state.Whether can write data and writeable number of times according to CD, that CD is divided into is read-only, single writes and repeat to write and read type.
The pick-up head of such optical disk system should be able to follow the tracks of a series of continuous datas so that the data of reading and recording on CD.The principle of following the tracks of is when a laser beam is positioned a pit, utilizes the diffraction of light effect to make the unlikely session that departs from objectives of pick-up head.Fig. 1 shows generation like this, and the angle θ of the first-order diffraction light that is provided by following formula (1), and the reference number 2 and 4 among Fig. 1 is represented optical disc substrate and pit respectively.
sinθ＝λ/p……(1)
Wherein λ is an optical maser wavelength, and p is a track pitch.
In optical disk system, the tracking of data utilizes the signal that interference effect produced between zero order diffracted light and the first-order diffraction light to finish.As formula (1), at track pitch p during less than wavelength X, sin θ will be greater than 1, and zero order diffracted light will not exist, and so then can not carry out the tracking based on interference effect.The limitation of this diffraction method has constituted restriction to track pitch p and has therefore also limited the recording density of existing optical disk system.
Fig. 2 shows the exemplary session structure among the existing DVD.This DVD generally includes and is positioned on the polycarbonate substrate 2, has the flute profile pit 4 of 0.74 μ m track pitch, and the diameter of substrate 2 is 120mm, and thickness is 0.6mm, and an aluminium mirror coating that is covered on the pit 4.The data recording capacity of this kind DVD is for example 4.7GB/ face.The pick-up head that is used for existing DVD player has the wavelength of 650nm and 0.6 NA (numerical aperture), because according to shown in Fig. 1 and the formula (1), p is limited to 0.74 μ m, so the data recording capacity of DVD as shown in Figure 2 is no more than 4.7GB.The development trend of current optical disc reads the image of HDTV (high-definition television) for development high density recording and high speed.
This purpose can realize by increasing CD area and revolution at an easy rate, yet this method is in fact infeasible, because so the size of CD and fetch equipment also will increase, so a kind of solution effectively and preferably is to improve the recording density of unit area.For improving recording density, can be by developing the purpose that a kind of practical laser with shorter wavelength is realized dwindling track pitch and improved the line-spacing recording density.
A kind of on the CD of the 120mm diameter as the DVD among Fig. 2 the method for record more data be: track pitch p is reduced to 0.6 μ m or 0.5 μ m from the existing value of 0.74 μ m, the result cause the angle θ of first order diffraction light and have first order diffraction light than the big angle in pick-up head the object lens light receiving area depart from increase.Therefore, can not utilize the first generation DVD player track record with predetermined λ and NA value is data on the high-capacity CD-ROM of 0.6 or 0.5 μ m in the p value.
Even can realize following the tracks of, but data are to read from adjacent track, can produce noise and the data read errors that is called cross-talk thus.Therefore, need a kind of CD, so that can be with existing DVD player (to call DVD in the following text) reading of data from have the wide high-capacity CD-ROM in 0.6 or 0.5 μ m road with new structure.
Summary of the invention
One object of the present invention is to provide a kind of high density compact disc, and the track structure that this CD has allows the digital versatile disc-ROM player of prior art that the data on the CD are read.
Another object of the present invention is to provide a kind of high density compact disc, the track structure that this CD has can overcome the restriction of the limitation of optical diffraction to the session track pitch.
For achieving the above object, a kind of high-density read-only type CD is provided here, comprising: substrate; The a plurality of sessions that on described substrate, form; The a plurality of grooves that in each session, form, the xsect of described groove forms waveform continuously along each session; Be formed at a plurality of data pits in the groove; And be covered in reflectance coating on the described pit.Like this, even for the also narrow track pitch situation of track pitch of the CD that data pits is only arranged than those each sessions, the data in the session also can be read out.
Description of drawings
The detailed description that preferred embodiment is done in conjunction with the drawings, above-mentioned purpose of the present invention and advantage can obtain clearer understanding:
Fig. 1 is used to illustrate the optical diffraction on the CD;
Figure 2 shows that the exemplary session structure of a prior art DVD;
Figure 3 shows that the track structure of high density compact disc according to an embodiment of the invention;
Figure 4 shows that under the present invention tracking error signal is with respect to the variation relation figure of the waveform groove degree of depth;
Figure 5 shows that in the DVD that has 0.5 μ m track pitch according to an embodiment of the invention, be shown in high frequency (HF) eye pattern (eye pattern) and 3T-11T and the long graph of a relation of 14T channel bit on the oscillograph screen.
Embodiment
Below with reference to accompanying drawings the preferred embodiments of the present invention are described.Should be noted that identity element is represented with identical reference number in each figure, and, unless it can cause misunderstanding to material circumstance of the present invention, otherwise to repeating no more about general known function and structure of the present invention.
Fig. 3 shows the schematic track structure of DVD according to an embodiment of the invention.As shown in Figure 3, the data recording capacity of described DVD improves by the session track pitch is reduced to 0.5 μ m from 0.74 μ m.The tracking servo problem and the crosstalk problem that are run into when using the prior art DVD player to read the DVD with 0.5 narrower μ m track pitch in order to solve be formed with corrugated groove 6 in each session of described DVD, and data pits 4 form in the groove 6.Waveform groove 6 constitutes continuously along session, so that reduce the angle θ of first order diffraction light.Because the light with less angle diffraction enters into the light receiving area of pick-up head camera lens, thereby tracking servo becomes possibility.
Be used for the value that will preferably be set to carry out data-signal at utmost scattering from the depth d of the waveform groove 6 of the data-signal scattering in adjacent light road.Below this is done detailed description.Because narrowing down of optical channel distance, for the plane surface in the existing CD, the data-signal that reads from adjacent session will become very big, and this will cause data read errors.But the pit 4 that is positioned in embodiments of the present invention, waveform groove 6 will be from the data-signal scattering in adjacent light road.Also promptly, interfere by the waveform groove 6 that forms in each session to each other from the signal of a corresponding session and adjacent track, and this interference can be offset by the degree of depth of controlling described groove 6.Like this, just eliminated arrow path apart from caused crosstalk problem.The degree of depth of described groove 6 can be set at a value in experiment, to prevent the generation of crosstalk problem, this will be described with reference to figure 4 in the back.
Usually, the CD that comprises DVD is to make through stamper, and pressing mold, injection molding, plated film and other subsequent handlings are manufactured and formed.In stamper manufacturing process, utilize photoetching process that meticulous pit is made on the photoresists; Pressing mold is made and to be meant and to utilize the mould (be mould) of electrochemical plating in will cheating pirate recordings is to the electrodeposited coating with 0.3mm thickness, so that injection molding; Annotating film refers to utilize mould to read the technology of optical disc substrate en bloc; By coating process, can form reflectance coating.
In an embodiment of the present invention, described pit 4 and described waveform groove 6 are that the imprinting by laser beam forms in stamper manufacturing process, existing DVD finishes imprinting with beam of laser, and two laser beam have been used in an embodiment of the present invention, a branch ofly be used to construct the master data pit, and another bundle is used to construct the waveform groove.For forming described master data pit, a lasing light emitter is accepted the modulation signal from DVD formatter (formatter), and generation and the corresponding laser beam of pit size.In order to form continuous waveform groove, another lasing light emitter is controlled to produce than the bigger laser beam of laser beam spot size that forms data pits, accepts a predetermined DC (direct current) signal, and produces the laser beam of a constant dimension.
By also reduce the angles of first order diffraction light thus along a series of session structure waveform grooves that contain pit, both having made is that tracking servo also can be realized under the very narrow situation of session.Tracking error signal is by the decision of d value, and d depends on p.
Illustrated according to experimental observation among Fig. 4, tracking error signal should be noted that from Fig. 4 as p=0.5 μ m with respect to the situation of change of d value, and d=25nm and p=0.6 μ m during d=20nm, can obtain optimum tracking error signal.
The track pitch that Fig. 5 shows according to the embodiment of the invention is the DVD of 0.5 μ m, HF eye pattern that shows on the oscillograph screen and the relation of 3T-11T and 14T.From eye pattern, as can be seen, in the DVD player of prior art, can obtain enough signals that reads.
Shown in being compared as follows of the DVD of prior art and embodiment of the invention CD
Table 1
| Road wide (μ m) | The waveform groove degree of depth (nm) | Tracking error signal | Capacity (GB) | Time for reading (min) | |
| Prior art DVD | 0.74 | 0 | 3.0 | 4.7 | 120 |
| Embodiment 1 | 0.60 | 20 | 3.5 | 6.0 | 150 |
| | 0.50 | 25 | 3.2 | 7.0 | 180 |
As shown in table 1, for example, embodiment 2 accommodates 180 minutes readable data, for 120 minutes readable data of prior art DVD, this means that embodiment 2 approximately is on capacity
1.5 times of prior art.
As mentioned above, DVD structure of the present invention can be implemented on the DVD player of prior art and read long-time and high-resolution view data.Have in LASER Light Source under short wavelength's the situation (for example having the green ripple of 532nm or the blue ripple of 450nm), the application of the invention DVD structure, the prior art DVD player in addition can be under the situation of 0.4 or 0.3 μ m session track pitch reading of data.That is to say, tracking error or crosstalk problem can not take place.When the pick-up head that is used for DVD player is designed to have under the condition of short-wavelength light, can also obtain than the foregoing description DVD of high power capacity more.
Though describe the present invention in conjunction with the specific embodiments with describe, should be understood that under situation about not departing from the scope of the present invention with spirit, those skilled in the art can also make various variations.Scope described here is meant the relevant claim that proposes subsequently.
Claims (5)
1. DVD-ROM comprises:
Substrate;
The a plurality of sessions that on described substrate, form;
The a plurality of grooves that in each session, form, the xsect of described groove forms waveform continuously along each session;
A plurality of data pits that in groove, constitute; And
Be covered in the reflectance coating on the described pit.
2. DVD-ROM as claimed in claim 1, wherein, the degree of depth of described groove is set 20-30nm for, with the data-signal of scattering farthest from adjacent session.
3. DVD-ROM as claimed in claim 2, wherein, when track pitch was 0.5 μ m, the degree of depth of groove was 25nm.
4. DVD-ROM as claimed in claim 2, wherein, when track pitch was 0.6 μ m, the degree of depth of groove was 20nm.
5. as one of them described DVD-ROM of claim 1 to 4, wherein said pit and waveform groove are formed with the laser beam photoetching in the mother CD burning process by laser beam.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970016072A KR19980078521A (en) | 1997-04-29 | 1997-04-29 | High-density playback-only optical disc |
| KR16072/97 | 1997-04-29 | ||
| KR16072/1997 | 1997-04-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1208920A CN1208920A (en) | 1999-02-24 |
| CN1133161C true CN1133161C (en) | 2003-12-31 |
Family
ID=19504229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98106232A Expired - Fee Related CN1133161C (en) | 1997-04-29 | 1998-04-07 | High-density read-only optical disk |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH10320834A (en) |
| KR (1) | KR19980078521A (en) |
| CN (1) | CN1133161C (en) |
| GB (1) | GB2324903B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7907180A (en) * | 1979-09-27 | 1981-03-31 | Philips Nv | RECORD CONTAINER IN WHICH INFORMATION HAS BEEN INCLUDED IN AN OPTICALLY READABLE INFORMATION STRUCTURE AND EQUIPMENT FOR READING IT. |
| EP0100995A3 (en) * | 1982-08-10 | 1985-10-16 | Kabushiki Kaisha Toshiba | Optical disk |
| US4674070A (en) * | 1984-08-11 | 1987-06-16 | Victor Company Of Japan, Ltd. | Optical type disc with V-shaped groove and optical type reproducing apparatus therefor |
| JPS6163930A (en) * | 1984-09-04 | 1986-04-02 | Matsushita Electric Ind Co Ltd | Disk recording carrier |
| JP2869147B2 (en) * | 1990-06-15 | 1999-03-10 | パイオニア株式会社 | Optical information recording medium |
-
1997
- 1997-04-29 KR KR1019970016072A patent/KR19980078521A/en not_active Application Discontinuation
-
1998
- 1998-03-12 GB GB9805177A patent/GB2324903B/en not_active Expired - Fee Related
- 1998-04-07 CN CN98106232A patent/CN1133161C/en not_active Expired - Fee Related
- 1998-04-15 JP JP10105042A patent/JPH10320834A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| CN1208920A (en) | 1999-02-24 |
| JPH10320834A (en) | 1998-12-04 |
| KR19980078521A (en) | 1998-11-16 |
| GB2324903B (en) | 1999-05-19 |
| GB2324903A (en) | 1998-11-04 |
| GB9805177D0 (en) | 1998-05-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| 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: 20031231 |