CN101236759A - Ultra-high visualization degree optic recording medium - Google Patents

Ultra-high visualization degree optic recording medium Download PDF

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Publication number
CN101236759A
CN101236759A CNA2007100369976A CN200710036997A CN101236759A CN 101236759 A CN101236759 A CN 101236759A CN A2007100369976 A CNA2007100369976 A CN A2007100369976A CN 200710036997 A CN200710036997 A CN 200710036997A CN 101236759 A CN101236759 A CN 101236759A
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ultra
recording medium
layer
visualization degree
optic recording
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李昌浩
金正宏
郭金哲
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Shanghai LG Electronics Co Ltd
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Shanghai LG Electronics Co Ltd
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Abstract

The invention relates to an ultrahigh imaging degree optical reading medium, in particular to an ultrahigh imaging degree optical recording medium for storage and reading by illuminating a marker generated under the optical diffractive limit on a substrate with multilayer overlaid; the invention is characterized by comprising two following parts: a recording layer formed by tellurium (Te), oxygen (O) and a third metal and a playing layer which is formed by any substance of a nonlinear optical substance, a thermochromic substance and a phase transition substance and can carry out ultrahigh imaging when light radiates on the recording layer. The ultrahigh imaging degree optical reading medium has the following advantages: as the invention can not generate a large bubble marker and can generate an even marker shape, the invention has high signal playing quality and can store the recorded content in the recording layer for a long time.

Description

Ultra-high visualization degree optic recording medium
Technical field
The present invention relates to a kind of ultra-high visualization degree optic recording medium, relate in particular to below the diffraction of light boundary and generate mark, and the ultra-high visualization degree optic recording medium that utilizes this mark of rayed to store and read.
Background technology
The typical example of now having developed or produced the optical recording media of product comprises DVD (the digital versatile disc that utilizes the red laser record and read; To call DVD in the following text) and use BD (the Blu-ray disc of blue laser; To call BD in the following text).The memory capacity DVD level of above-mentioned optical recording media is 4.7 lucky gal byte (Giga byte; Hereinafter referred to as GB), the BD level that puts goods on the market recently is about 25GB.According to conjecture, after 2005, the size of a CD of optical recording media can reach more than the 100GB.After 2010, the size of a CD can reach terabyte (Tera byte; TB) more than.But,,, just need to store the above capacity of 20GB, the information storage medium that is used for canned data of the data rate that 25Mbps is above for store high-density digital video (High Density Digital Video) as the information of signal flow.
Now, under various multimedia environments, the multifunctional information memory technology presents multiple development form.Wherein, optical recording media not only can be put into playing device or therefrom take out, and can store high capacity information.Simultaneously, when reading, can carry out at random (random access) to the content of storage and read, can keep the reliability of stored data, because expense is cheap, so in multiple information storage means, be concerned by people most.
Optical recording media must reduce the size of recording pit (pit), can increase recording density.Record must reduce the size of incident laser light beam in order to reduce the size of concave point, and (λ) is in direct ratio for the size of laser beam and Wavelength of Laser, and to thing lens openings number (Numerical Aperture; NA) inversely proportional (d ∝ λ/NA, wherein, d is the size of laser beam, λ is a wavelength, NA is the opening number of lens).Therefore, in order to reduce the size of laser beam, just must reduce the wavelength of laser beam or increase opening number.In order to obtain the high density medium, just should use the short laser of wavelength to store and play.But, use short wavelength laser (blue laser (405nm)) and many opening numbers (NA=0.85) to realize that the high density storage has almost arrived desirable boundary, in order to obtain bigger memory capacity, must need new technology.Therefore, as exchanging with existing C D and DVD playback equipment, and a scheme of the optical recording media that is used for store high-density information that the memory capacity of the 650MB that volume ratio initial stage CD is had is high hundreds of times is to use ultra-high imaging degree (super-resolution) phenomenon that optical recording media is carried out new research.
This ultra-high visualization degree optic recording medium is expected to use existing laser light pick-up system, simultaneously, greatly reduces the size of record mark, thereby increases storage density.(Write onceread many, WORM) ultra-high visualization degree optic recording medium forms the record mark of bubble (bubble) shape to existing once record property on recording layer.The record mark of above-mentioned bubble shape is that the metallics of nanometer size (for example, Pt) separates the nano particle that generates with the combination of oxygen element or nitrogen element etc. under certain high temperature.Simultaneously, utilize non-linearity optics rerum natura or hot activity nature material, below diffraction limit, form very little hole (aperture), generate the little mark that reads.
Below, with reference to Fig. 1 the structure of existing ultra-high visualization degree optic recording medium is described.
Fig. 1 is existing optical recording media constitute and cross-sectional configuration figure.Existing ultra-high visualization degree optic recording medium is made of following each several part: substrate 10, reflection horizon 20, dielectric layer 30a, 30b, 30c), photic zone 40, recording layer 50 and broadcast layer 60.Laser beam incides optical recording media by photic zone 40, and is reflected away after arriving reflection horizon 20.
Existing recorded is PtOx (oxide of Pt) with recording layer 50 materials useds of ultra-high visualization degree optic recording medium.But, if comprise on the existing optical recording media of above-mentioned constitute and shone laser beam, just can form very big air bubble-shaped mark.Simultaneously, the shape of above-mentioned air bubble-shaped mark is inhomogeneous, and signal quality (jitter) is also bad.
Summary of the invention
The objective of the invention is to be to provide a kind of ultra-high visualization degree optic recording medium that generates uniform mark shape than atmosphere blister mark and have the higher signal play quality that can not generate.
Another object of the present invention provides and a kind ofly can have a kind of material on ultra-high visualization degree optic recording medium and can make the long-time ultra-high visualization degree optic recording medium of preserving of content of record.
For achieving the above object, ultra-high visualization degree optic recording medium of the present invention, be characterized in: multilayer superposes on the substrate, below the diffraction of light boundary, generate mark, and the ultra-high visualization degree optic recording medium that utilizes this mark of rayed to store and read, it comprises following two parts: the recording layer that is formed by tellurium (Te), oxygen (O) and the 3rd metal; Form by any one material in non-linear optical material, hot chrome yellow (thermochromic) material and the phase change material, when illumination is mapped on the recording layer, just can carry out the broadcast layer of ultra-high imaging.
According to above-mentioned conception of the present invention, be preferably, the 3rd metallic element of above-mentioned recording layer is from silver (Ag), gold (Au), tungsten (W), manganese (Mn), platinum (Pt), titanium (Ti), zirconium (Zr), boron (B), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), antimony (Sb), tantalum (Ta), aluminium (Al), indium (ln), copper (Cu), tin (Sn), zinc (Zn) is selected more than one in the bismuth elements such as (Bi).If added the 3rd metallic element in tellurium on the above-mentioned recording layer (Te) and the oxygen (O),, can obtain good recording characteristic because the record mark of air pocket state can not occur.
According to above-mentioned conception of the present invention, be preferably, it is more than 25%, below 60% that the O atom that comprises in the above-mentioned recording layer contains proportional.
According to above-mentioned conception of the present invention, be preferably, the 3rd metallic element atom that adds among Te and the O in the above-mentioned recording layer is more than 1%, below 35%.
According to above-mentioned conception of the present invention, be preferably, the thickness of above-mentioned recording layer is more than the 1nm, below the 30nm.
According to above-mentioned conception of the present invention, be preferably, above-mentioned broadcast layer selects more than one elements to form by from germanium (Ge) in the antimony (Sb), tellurium (Te).
According to above-mentioned conception of the present invention, be preferably, above-mentioned broadcast layer is to be benchmark with the recording layer, is superimposed upon the position of substrate or in the far position of substrate on the position, any place.
According to above-mentioned conception of the present invention, be preferably, broadcast layer thickness is more than the 3nm, below the 200nm.
According to above-mentioned conception of the present invention, be preferably, dielectric layer superposes on above-mentioned recording layer two surface of contact.
According to above-mentioned conception of the present invention, be preferably, above-mentioned optical recording media is a storage-type (WORM) optical recording media.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is existing optical recording media constitute and cross-sectional configuration figure;
Fig. 2 is constitute and the cross-sectional configuration figure of optical recording media one embodiment of the present invention;
Fig. 3 is constitute and the cross-sectional configuration figure of another embodiment of optical recording media of the present invention;
Fig. 4 is constitute and the cross-sectional configuration figure of the another embodiment of optical recording media of the present invention.
Embodiment
Below, with reference to Fig. 2 one embodiment of ultra-high visualization degree optic recording medium of the present invention is described.One embodiment of ultra-high visualization degree optic recording medium of the present invention is the circle of the about 120mm of external diameter, the about 1.2mm of thickness, the reflection horizon 20 that superposeed successively on substrate 10, dielectric layer 30a, recording layer 50, dielectric layer 30b, broadcast layer 60, dielectric layer 30c and photic zone 40.The wavelength of the laser beam that uses in the ultra-high visualization degree optic recording medium is between the 380-450nm, preferably use the laser beam (laserbeam) of about 405nm, from the photic zone surface, promptly shine recording layer and carry out data (data) and store and read from light entrance face.If read or store data on optical recording media, using opening number is 0.7 above lens, preferably use opening number be about 0.85 to the thing lens, thus, about the big or small about 0.4 μ m of the laser beam point on the recording layer.
In order to guarantee the thickness of optical recording media, the substrate 10 general disks that use thick about 0.6-1.1mm.Substrate 10 faces are the mind-set periphery therefrom, perhaps forms spiral concave point (groove) and salient point (land) according to its reverse direction, is used for guided laser.The constitute of substrate 10 can use multiple applying materials such as glass, pottery or resin, simultaneously, uses the injection moulding performance, and birefringence when laser is injected (birefringence) is little, signal to noise ratio (S/N ratio) (Carrier-to Noise Ratio; CNR) polycarbonate (Polycarbonate) of characteristic such as big.Make substrate and use the injection molded method better, still, also can use other methods such as photosensitive polymerization method.
Reflection horizon 20 will reflect back from the laser beam that photic zone 40 is injected, and makes above-mentioned laser beam inject photic zone 40 again.Magnesium can be used in reflection horizon 20, aluminium, and titanium, chromium, iron, cobalt, nickel, copper, zinc, germanium, silver, elements such as platinum constitute.Wherein,, use aluminium in order to obtain higher reflectivity, gold, silver, metal materials such as copper or its alloy are better.In ultra-high visualization degree optic recording medium of the present invention, be not that portion is provided with reflection horizon 20 within it, but, if reflection horizon 20 is set, the reflectance of the laser beam of injecting must guarantee, when playing after the optical recording, utilize multiple interference effect just can obtain the higher play signal of quality (C/N ratio).The thickness in reflection horizon 20 is that 5-300nm is better.If 20-200nm is then better.During the thickness in reflection horizon 20 is not enough 5nm, can not fully obtain above effect, and when reflection horizon 20 thickness surpass 300nm, not only the superficiality in reflection horizon 20 can variation, and film formation time understands elongatedly, makes production efficiency low.
Dielectric layer 30a, 30b, 30c have following effect: recording layer between dielectric layer 30a, 30b, 30c 50 and broadcast layer 60 are carried out physics or chemoproection, and can prevent the information quality variation that writes down in the optical recording media.The constitute of dielectric layer 30a, 30b, 30c is not limited to make laser beam to see through the transparent dielectric in laser beam wavelength zone.For example, can use oxide, sulfide, nitride or its combination ingredient.But, thermal deformation and the angle of protecting recording layer 50 do not take place from protective substrate 10, preferably use Al 2O 3, AlN, ZnO, ZnS, GeN, GeCrN, CeO 2, SiO, SiO 2, Si 3N 4, SiC, La 2O 3, TaO, TiO 2In aluminium, silicon, cerium, titanium, zinc, the oxide of tantalum etc., sulfide or its compounding substances.Preferably use ZnS and SiO 2Compounding substances.If use ZnS and SiO 2Potpourri, ZnS and SiO 2Ratio be preferably about 80: 20 especially desirable.The constitute of each dielectric layer (30a or 30b or 30c) can be identical, also can be different.The thickness of each dielectric layer 30a, 30b, 30c does not need special qualification, and it is better to be generally 3-200nm.During the thickness of above-mentioned dielectric layer 30a, 30b, 30c is not enough 3nm, just can be difficult to obtain the effect of above-mentioned dielectric layer, if the thickness of dielectric layer surpasses 200nm, film formation time just can be elongated, production performance just can variation, simultaneously, the stress that has of dielectric layer just is easy to generate crack (crack).
Recording layer 50 is the layers that form record mark, if a storage-type (WORM) optical recording media just forms irreversible record mark.Shine on the recording layer 50 if having the laser of certain power,, on above-mentioned recording layer 50, form record mark just two kinds of constitute a part or whole part are mixed.Simultaneously, above-mentioned record mark and laser beam do not have the difference of reflectivity between the illuminated portion, just can write down and read.
In the optical recording media of the present invention, recording layer 50 can comprise tellurium (Te) and oxygen (O).If with the main composition of TeOx (oxide of Te), even recording layer 50 does not carry out initialization procedure, after film forming, if make laser intensity change the irradiation amorphous state, just can form the mark (mark) of crystal habit as recording layer.Because said process is irreversible, so it is the emphasis characteristic of a recordable type recording medium can't revising or eliminate.Above-mentioned recording film has moisture-proof, so when environment changes, still can keep higher record confidence level.If use above-mentioned recorded matter, just can utilize monofilm to carry out record, so consider comparatively desirable from producing cost (cost) angle.But, if use TeOx in the recording layer, before laser radiation recording layer 50 makes the recording film sufficient crystallising, need some time a little, so as the recording medium that requires high-speed responsive, just some is improper.Therefore, in order to overcome above shortcoming, just must in TeOx, add element (M).Element (M) from silver (Ag), the gold (Au), tungsten (W), manganese (Mn), platinum (Pt), titanium (Ti), zirconium (Zr), boron (B), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), antimony (Sb), tantalum (Ta), aluminium (Al), indium (ln), copper (Cu), tin (Sn) selects an above element better in the zinc (Zn), bismuth (Bi).The above-mentioned element that is added (M) promotes the Te crystallization, can generate the crystal grain of Te-M at a high speed.Therefore, the material energy high speed crystallization that comprises in the recording layer 50, the line item of going forward side by side, and can access high-speed responsive.Advance together, the element that adds among Te that comprises in the above-mentioned recording layer 50 and the O is a metallics, can not form the record mark than air pocket, and above-mentioned record mark can be preserved for a long time.
In order fully to obtain above-mentioned effect, it is more than 25% that the O atom that comprises in the above-mentioned recording layer contains proportional, better below 60%.The 3rd metallic element atom that adds among Te and the O in the above-mentioned recording layer is more than 1%, and is better below 35%.
Recording layer 50 thickness are not had particular restriction, still, in order fully to suppress the noise rank of play signal, guarantee sufficient record effect, make the reflectance varies of record front and back more abundant, the thickness of each layer is all better in the scope of 1-30nm.
Broadcast layer 60 comprises the material that can guarantee ultra-high imaging degree, and the constitute that uses in the broadcast layer 60 also can be non-linear optical material or hot chrome yellow (thermochromic) material that changes by the Temperature Distribution optical characteristics and phase change material etc.The material of broadcast layer uses Ge, Sb, and any one is better above among the Te.Observe from the direction that substrate is injected to laser beam, the overlay order of broadcast layer 60 can be on recording layer 50, also can be in its lower section.The thickness of broadcast layer 60 is not particularly limited, and still, in order fully to guarantee the ultra-high imaging degree phenomenon, also in order to obtain sufficient optical change rate when reading, thickness is that 3-200nm is better.
In order to form above-mentioned reflection horizon 20, dielectric layer 30a, 30b, 30c, recording layer 50 and broadcast layer 60 can use optical spectroscopy, also can use the vacuum lamination method.
Photic zone 40 is forming the light path that forms laser beam when laser beam is injected face, and its thickness is that 100 μ m-0.6mm are better.The constitute of photic zone 40 is not limited at the high material of laser beam wavelength zone iuuminting, better with uv-hardening resins such as oleic series or epoxide as the constitute of photic zone 40, perhaps also can use translucent sheet and various sticker or the adhesive made by the permeability resin.
Below, with reference to Fig. 3, another embodiment of ultra-high visualization degree optic recording medium of the present invention is described.Fig. 3 seems similar to Fig. 2, also is the cross section structure figure of ultra-high visualization degree optic recording medium, and still, its recording layer 50 and broadcast layer 60 have changed the position.
As mentioned above, observe from the direction that substrate 10 is injected to laser beam, recording layer 50 is compared with broadcast layer 60, and recording layer 50 can be nearer from substrate 10 than broadcast layer 60, also can be that broadcast layer 60 is nearer from substrate 10 than recording layer 50.
Fig. 4 is constitute and the cross-sectional configuration figure of the another embodiment of optical recording media of the present invention.In Fig. 4,50 to one broadcast layer 60a are nearer from photic zone 40 for recording layer, and 60b is nearer from substrate 10 than another broadcast layer.Simultaneously, can superpose respectively dielectric layer 30a, 30b, 30c, 30d of each recording layer 50 and broadcast layer 60a, 60b two sides.
Below, will the effect of ultra-high visualization degree optic recording medium of the present invention be described:
The first, what ultra-high visualization degree optic recording medium of the present invention generated is uniform mark shape, and can not generate than atmosphere blister mark, and has the higher signal play quality;
The second, ultra-high visualization degree optic recording medium of the present invention can make the content of record be kept on the recording layer for a long time.
Though the present invention describes with reference to current specific embodiment, but those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, under the situation that does not break away from spirit of the present invention, also can make the variation or the replacement of various equivalences, therefore, as long as in connotation scope of the present invention in the scope to the variation of the foregoing description, claims that modification all will drop on the application.

Claims (11)

1. ultra-high visualization degree optic recording medium is characterized in that: the multilayer that superposes on the substrate, below the diffraction of light boundary, generate mark, and the ultra-high visualization degree optic recording medium that utilizes this mark of rayed to store and read, it comprises following two parts:
The recording layer that forms by tellurium, oxygen and the 3rd metal;
Form by any one material in non-linear optical material, hot chrome yellow material and the phase change material, when illumination is mapped on the recording layer, just can carry out the broadcast layer of ultra-high imaging.
2. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: the 3rd metallic element of described recording layer is to select more than one from elements such as silver, gold, tungsten, manganese, platinum, titanium, zirconium, boron, chromium, iron, cobalt, nickel, palladium, antimony, tantalum, aluminium, indium, copper, tin, zinc, bismuth.
3. ultra-high visualization degree optic recording medium as claimed in claim 2 is characterized in that: the 3rd metallic element atom that adds in tellurium and the oxygen in the above-mentioned recording layer is more than 1%, below 35%.
4. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: it is more than 25%, below 60% that the oxygen atom that comprises in the above-mentioned recording layer contains proportional.
5. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: described broadcast layer is formed by more than one elements of selecting from germanium, antimony, tellurium.
6. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: the thickness of described recording layer is more than the 1nm, below the 30nm.
7. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: described broadcast layer is a benchmark with the recording layer, is superimposed upon the position of described substrate or in the far position of substrate on the position, any place.
8. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: described broadcast layer thickness is more than the 3nm, below the 200nm.
9. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that, also comprises: above-mentioned ultra-high visualization degree optic recording medium and substrate contacts, the reflection horizon that the laser beam that is injected into ultra-high visualization degree optic recording medium is reflected.
10. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: dielectric layer superposes on described recording layer two surface of contact.
11. ultra-high visualization degree optic recording medium as claimed in claim 1 is characterized in that: above-mentioned optical recording media is a storage-type optical recording media.
CNA2007100369976A 2007-01-31 2007-01-31 Ultra-high visualization degree optic recording medium Pending CN101236759A (en)

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CNA2007100369976A CN101236759A (en) 2007-01-31 2007-01-31 Ultra-high visualization degree optic recording medium

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CN101236759A true CN101236759A (en) 2008-08-06

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