• 专利附录
  • 专利说明
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    • 专利摘要:
    The present invention relates to an optical recording medium based on the Fabry-Perot principle, a method for manufacturing the same, and an apparatus for manufacturing the same, wherein the optical recording medium according to the present invention has a recording layer including a partial reflective film, a buffer layer, a thick reflective layer, and optionally a protective coating thereon. With a transparent substrate having grooves positioned therein, Fabry-Perot is formed by the partial reflection film, the buffer layer and the thick reflection film, and the information can be recorded by the deformation of any one of the partial reflection film, the buffer layer, the thick reflection layer or the substrate. Deformation alters or destroys Fabry-Perot, reflectance is reduced, and deformation effects are used for deformation, so non-liquid high molecular weight materials can be used in the buffer layer, and reflected amplitudes of substrate interfaces / partial reflective films inside and outside the grooves Or tracking may occur by using the difference of phases (while keeping the recording laser inside the groove) It is characterized by.
    公开号:KR19990071730A
    申请号:KR1019980704008
    申请日:1996-11-28
    公开日:1999-09-27
    发明作者:게리트 코르넬리스 두벨담；뷔크 프레디 게르하르트 헨드릭쿠스 반；니코 마스칸트；민경선；허영재；김종성
    申请人:윤종용；삼성전자 주식회사；샬크비즈크 피이터 코르넬리스 ; 페트 귄터；아크조 노벨 엔. 브이.；
    IPC主号:
    专利说明:

    Optical recording media based on the Fabry-Perot principle
    The present invention relates to compact discs (CDs) and digital tapes or cards, in particular so-called write-once-read-many-times (WORM) write-once compact discs or tapes capable of recording only once, and rewritable CDs and tapes. It is about. In this type of media, information can be recorded by a customer.
    In a conventional read-only CD, information is stored in a pit embossed on a disc. The reading is based on diffraction for regular pit-edge structures. The interference of the diffracted array depends on the position of the laser spot. This causes the modulation of the reflected light used to read the information. Conventional read-only CDs are only suitable for large scale production because the production steps (to obtain recorded discs) are rather complicated, and therefore the production costs can only be effectively matched through mass production. Accordingly, there is a need for CDs and digital tapes or cards that can be produced in smaller capacities or that can be written by customers themselves. EP 0,353,391 includes a light transmitting substrate having a deformable surface, a light absorbing layer covering the deformable surface, and a light reflecting layer covering the light absorbing layer, wherein the deformable surface is formed by the light absorbing layer to form an optically readable pit. An optical recording medium is described which is deformable by energy generated when absorbing a recording laser beam. The readout is again based on the interference of the diffracted array. While the readout laser is emitting light, it is reflected by the reflective layer past the light absorbing layer. The optical wavelength in the pit is different from the land because the coefficient of refraction within one pit is different from that of the outside (land). Laser light directed into the pit interferes with light directed to diffraction causing land. The interference of the diffracted array depends on the exact location of the read spot. The resulting reflection modulation is used to read the information.
    Until now, there has been a continuing need for improvement in reflectance and contrast in the proposed WORM and rewritable media. PCT patent application WO 96/16402, filed with the applicant, also includes a substrate 1, a partially transparent thin reflective layer 2, a layer 3 comprising a liquid crystal material having a thickness d between 100 and 1200 nm and An optical recording medium having a thick reflective layer 4 having a reflectance of 50% or more is described.
    Thus, a very thin reflective layer is presented in comparison with the above optical recording medium, wherein the liquid crystal material layer 3 is sandwiched between two reflective layers. In this way, Fabri-Perot etalon is formed. The Fabry-Perot phenomenon is used to obtain the difference in reflection between the recorded and unrecorded states of the digital storage medium. Although a satisfactory contrast can be obtained with the concept described in the international application WO 96/16402, some problems still have to be solved. First of all, the use of a liquid crystal material for the recording layer increases the cost of the above concept. Since the liquid crystal material must satisfy several conditions (Tg, Tc directionality, etc.), the selection is somewhat limited. As a result, the solubility of the liquid crystal material selected in the spin-coating solution is often insufficient. Another disadvantage of the optical recording medium is that the recording principle is based on the phase change of the liquid crystal material. As a result, the liquid crystal material must be arranged after being applied to the substrate, thus requiring additional manufacturing steps. According to the optical recording medium according to the present invention, the above problems are reduced or all solved.
    Optical recording medium according to the present invention
    a) a transparent substrate 1 having grooves,
    b) located on the transparent substrate and within the pentagons defined by the vertices of 7.15-i3.93, 7.15-i5.85, 8.96-i6.28, 9.56-i5.90 and 8.14-i3.77 in the n, k plane A partial mirror 2 composed of a material having a large complex refractive index that does not exist, a buffer layer 3 comprising a non-liquid high molecular weight material and optionally dyes, and A thick reflective layer (4) located on the buffer layer and forming a Fabry-Perot together with the buffer layer, wherein the thickness (d) of the buffer layer inside the groove is set such that the reflection of the medium is in a highly reflective state Floor and
    c) optionally a protective coating (5) located on said layer.
    The recording layer has a high complex refractive index that does not exist within a hexagon defined by vertices 1-i0, 2-i0, 2-i0.8, 10-i2, 10-i8 and 2-i1.5 in the n, k plane. It is preferable to include the partial reflecting film which consists of a material which has a.
    The Fabry-Perot Etalon is formed by the partial reflection film 2. The information can be recorded by modifying one or more of the partial reflection film, the buffer layer, the thick reflection layer or the substrate. This modifying effect alters or destroys Fabri-Perot etalons, and reduced reflection occurs. Since the deformation effect is used for recording, a high molecular weight material other than liquid crystal can be used for the buffer layer. Tracking (keeping the recording laser inside the groove) may occur by using the difference in reflected amplitude and / or phase of the substrate interface / partial reflective film inside and outside the groove, and the diffraction described further below occurs.
    For convenience, the term CD will be used to refer to all optical recording media according to the present invention.
    Fabry-Perot etalons typically consist of two parallel reflective layers located some distance d from each other. The reflectance dependence of Fabry-Perot Etalon on the specific buffer layer thickness is shown in FIG. 1, which is the substrate 1 having a refractive index of 1.58 and a thickness of 1.2 mm, and a refractive index of 0.08-i4.60 (gold). And a CD having a partially reflective film 2 having a thickness of 30 nm, a buffer layer 3 having a refractive index of 1.67, and a thick reflecting layer 4 having a refractive index of 0.08-i4.60 (gold) and a thickness of 200 nm. Provide a rough description of the For the sake of clarity the protective coating 5 is not shown here.
    The reflection dependence of the Fabry-Perot Etalon on the specific buffer layer thickness is shown in FIG. 2, which is a substrate 1 having a refractive index of 1.57 and a thickness of 1.2 mm, a refractive index of 2-i4 (11 nm thick aluminum). Provides a schematic depiction of a partially reflective film 2 with), a CD with a thick reflective layer 4 having a refractive index (100 nm thick aluminum) of 2-i7.5. For the sake of clarity the protective coating 5 is not shown here. The specific buffer layer thickness is defined as n.d / λ.
    The partial reflecting film made of gold has a high reflectance. Reflectance changes at regular intervals. The minimum reflectance is then called the reflectance strong. This minimum occurs when there is a destructive interaction of light circulating back and forth in the mirror. This is the case where the condition of Equation 1 is satisfied. If the condition of Equation 1 is satisfied, the reflectance is low.
    φ + (4π.n.d) / λ = 2π (m + ½)
    here,
    φ represents the phase change of the laser light with respect to reflection by the mirror,
    n represents the refraction coefficient in the unrecorded state,
    d represents the layer thickness of the buffer layer,
    λ represents the wavelength of the laser light used for recording,
    m is an integer of 0-5.
    The phase shift φ depends on the wavelength of the laser light, the mirror thickness and the refractive index of the adjacent medium and the mirror. In the CD according to the present invention, since the information is recorded inside the groove, the thickness d is the thickness inside the groove.
    In the recording medium according to the present invention, since the conventional CD player requires about 20% background reflection in the state recorded for tracking, and since the CD standard requires 60% recording contrast, the read spot of the laser is placed on the groove. Highly reflective Fabry-Perot with at least 50% reflectivity when not positioned and at least 60% reflectance for read spots on land is preferred. It has been found that CD can be formed in accordance with the CD standard with a partially reflective film material that meets the complex refractive index requirements described above. However, reflectance lower than 50% can be used when using a CD player that requires smaller background reflection. In the high density recording medium, a reflectance of 20% or more in the unrecorded state is preferable. In recording, Fabry-Perot is disassembled or broken by deformation of any of the partially reflective film, the buffer layer, the thick reflective layer or the substrate, resulting in at least 40% reflection reduction of the unrecorded state.
    As will be described later, the position of the reflection drop is determined by the equation (1). The width and depth of the reflectance drop are affected by the optical parameters (refractive coefficient, absorption coefficient and thickness) of the partial reflection film 2 and the absorption coefficient of the buffer layer 3. This effect is the 2x2 matrix format for wavelength propagation in isotropic stratified media developed by Abeles, such as the fourth edition of M. Born, E. Wolf's Principles of Optics, page 51 of Pergamon Press (1970). Can be determined with the aid of a computer program. In a thickness digital storage medium having a substrate having a refractive index n s and a thickness d s , a buffer layer having a thickness d and a refractive index n u , and a thick reflective layer having a thickness d m and a refractive index n m , tuned in an unrecorded state. It can be calculated how the thickness of the insulating layer and / or the absorption of the buffer layer can be adapted to obtain a digital storage medium that satisfies the conditions for the high reflective region of Fabry-Perot. Such calculations are well known to those skilled in the art, and no further explanation is required here.
    In well-known read-only CDs, recorded information is stored in a spiral track in which a region having a low reflectance (recorded groove region) is replaced with a region having a background reflectance (unrecorded groove region) higher than 65%. For conventional CDs, the pit length varies from 0.9 to 0.3 μm in 0.3 μm steps. At the longest pit (which generates the 11T signal), the reflectance should drop below 40% of the reflectivity in the unrecorded state. In conventional CD players the readout laser has a wavelength between 780 and 830 nm, generally 780 ± 10 nm. In order to be compatible with read-only CDs, the CD according to the invention should have a reflectivity of 65% unrecorded when using a read laser for a conventional CD player, and at the longest pitch the reflectance at the unrecorded state The reflectance should be lower than 40%.
    The present invention provides a CD having a variable (hereinafter referred to as the CD standard) that can be set to constitute a CD compatible with a conventional read-only CD.
    The optical recording medium according to the present invention includes a substrate 1 having a groove. This medium is read through the substrate. Thus, the substrate must be optically transparent to the laser light used for reading and writing. In a conventional CD player, laser light having a wavelength of 780 nm is used. Polycarbonates, amorphous polyolefins (APO) and glass that are optically transparent at this wavelength and have sufficient thermal stability and sufficient resistance to moisture are suitable as substrates. Polycarbonates are preferred in terms of cost and ease of adjustment. In addition, the properties of polycarbonate substrates meet CD standards. APO also has properties that meet the CD standard, but these substrates are more expensive than polycarbonate. However, polycarbonates are susceptible to chemical invasion by almost all solvents normally used to add buffer layer materials. This problem is reduced in two ways using the CD according to the invention. First, the partially reflective film can protect the substrate from the intrusion of the solvent. Secondly, since the non-liquid crystal material is used in the buffer layer, great freedom of solvent selection is generated. Thus, relatively mild solvents can be used. Thus, in the case of the CD according to the present invention, polycarbonate can be easily used as the substrate. For high density CDs the substrate should have a transmission in the wavelength range of 610 to 700 nm or less.
    As described above, a substrate having grooves for the CD according to the present invention is used. The groove is a spiral track printed on the substrate. This track is used to control the laser spot position during reading and writing. Since the partial reflecting film has a high refractive index, tracking can be done through the difference in reflected amplitude or phase of the partial reflecting film / substrate interface inside and outside the groove.
    The width and depth of the grooves are important for tracking. Usually a track width of 0.1-1.2 μm is used. Track depth is an important parameter that should be chosen with regard to the thickness of the buffer layer and the partially reflective film, and is usually in the range of 30-450 nm. The inventors have found that the relatively deep groove depth of 200-250 nm in combination with a buffer layer thickness of 230-260 nm and an aluminum partial reflecting film of 6-12 nm or a buffer layer thickness of 220 nm and a silicon partial reflecting film of 50 nm maintains reflection characteristics. It has been found that it produces optimal tracking contrast. In addition, an optimal tracking condition can be obtained with a track depth of 50-90 nm.
    In order to reduce the loss of laser light due to reflection at the air / substrate interface, the substrate may have a thin reflective layer and a semi-reflective structure on the uncovered side.
    As for the partially reflective film 2, both metal and non-metallic materials satisfying the above-mentioned refraction coefficient conditions can be used as long as the layer can be made thin enough to be partially transmissive to the laser light. This is usually in the range of 0.3-50 nm, corresponding to a conductivity of about 20-80%. The complex refraction coefficients for various materials are edited by Palik in 1985 and published in Parts 1 and 2 of the Handbook of Optical Constants of Solids, published by Press. The thin metal film exhibits a reaction similar to the reduced metal, and a person skilled in the art can easily select a suitable material. It is not possible to find a combination of layer thickness and track depth where an optical medium having satisfactory reflection characteristics and tracking contrast can be obtained with a material having a complex refractive index present in the above-described pentagon. It is preferable that materials having a complex refractive index existing outside of the above-described hexagon are selected. This will be described in more detail in the embodiments.
    The refractive index of metals usually has a high imaginary part. This means that assuming that the product nk is also high, it has high reflectivity and absorbency when used in transparent environments (such as air and polycarbonate). Absorption α per μm is expressed as −2πnk / λ (unit of lambda is μm). Thus, when recording with a laser, the laser light is reflected (tracked) by the Fabry-Perot system and absorbed by the metal partial reflecting film. The absorbed laser light is converted into heat, and deformation of any of the partial reflecting film, the buffer layer, the thick reflecting layer, or the substrate occurs. Suitable absorbing metals for the partially reflective film 2 include aluminum, nickel, vanadium, chromium, tantalum, iron, nickel-gold, nickel-vanadium, nickel-chromium, aluminum-gold and Is another alloy. The metal used to preserve pit integrity preferably has a relatively low thermal conductivity.
    Suitable nonabsorbable metals are, for example, gold, silver, tellurium, copper or alloys thereof or silicon, silicon nitride, silicon-germanium, silica, SiO, SiO-germanium and the like. This type of material usually has one high part (real or imaginary part) in the refractive index. This means that the material is reflective but hardly absorbent. When laser recording to a CD having this type of partially reflective film, the laser light is reflected by the Fabry-Perot system, but the absorption of the laser light will mainly have to occur in the buffer layer. Therefore, it is preferable to use a high absorbing buffer layer when using a non-metallic partial reflecting film for the CD according to the present invention. Particularly preferred are germanium, silicon-germanium alloys, silicon nitride and silicon having a low imaginary part of the refractive index, and gold, copper, tellurium and alloys having a low real part of the refractive index. The partially reflective film may be formed on the substrate by conventional methods commonly used in the art, such as vacuum deposition, electron beam deposition and sputtering.
    Non-liquid crystal high molecular weight (500-250,000) materials with suitable Tg function as a stable matrix for dyes and can be applied with satisfactory accuracy in thickness. The thickness of the buffer layer present in the groove may vary from 0.2 μm to 1 μm. As for Tg of a material, 70 degreeC or more is preferable. Examples of suitable non-liquid high molecular weight materials include polymers such as PMMA, styrene acrylonitrile or sulfonyl dianiline, and cyanobiphenyl and o-biphenyl. Glass such as epoxide glass and sulfonyl dianiline and p-biphenyl glass. The dye present in the buffer layer functions to convert the recording laser light into heat, so that any one of the partial reflecting film, the buffer layer, the thick reflecting layer or the substrate is deformed. If a metal partial reflecting film is used, the dye concentration may be reduced or even the dye may be removed because the laser light is absorbed by the partial reflecting film and the reflecting layer 4. Suitable dyes therefore have to absorb in the wavelength range of the recording laser used. Near-infrared absorbing dyes are used which absorb in the wavelength range of 780 to 850 nm for CD according to the CD standard recorded with a laser of 780 nm. For example, anthraquinone dyes (IR-700 from Nippon Kayaku Co., squailium dyes (NK-2772 from Nippon Kankoshikiso Genkyusho Co., Ltd., bis- [3- (7-isopropyl-1-) Methyl) -azulen-4-yl-2-ethyl-propionic acid n-butyl ester] squaric acid dyes (EP 0,310,080, Example 16), dyes disclosed in EP 0,310,080 and croconium dyes (Syntec ST 172, ST 9/3, ST 9/1, phthalocyanine dyes (copper (II) -1,4,8,11,15,18,22,25-octa of Aldrich) Butoxy-29H, 31H-phthalocyanine, zinc-1,4,8,11, 15,18,22,25-octabutoxy-29H, 31H-phthalocyanine).
    For high density CDs, dyes are required that absorb in the wavelength range of 400 to 700 nm. Examples of such dyes are azo dyes (SI-361 from Mitsui Doatsu Chemicals GmbH, and anthraquinone dyes (LCD 116 and LCD 118 from Nippon Kayaku Co., Ltd., M-137, M from Mitsui Doatsu Chemicals GmbH). -483, M-83 and M-497, squarylium dyes (ST 6/2 and ST 5/3 from Syntec) and triphenylmethane dyes (Fast Green FCF and Solvent Blue from Aldrich) .
    The buffer layer may comprise dye up to 90 wt%. However, it is desirable to use amounts up to 30 wt% to avoid segregation problems. The buffer layer may also include a stabilizer and / or a 10 2 -quencher to improve the stability of the layer. In applying the buffer layer, it is preferred that the high molecular weight material and optionally dyes and other additives are dissolved in a suitable solvent and spin coated. Other conventional means of applying the coating to the correct thickness may also be used.
    As mentioned above, the absorption coefficient of the buffer layer affects the reflection and absorption of the Fabry-Perot in combination with the optical parameters of the partial reflection film. The absorption coefficient is determined by the dye concentration and the absorption coefficient of the buffer layer. This can be used to determine the parameters of the CD according to the invention that are consistent with the CD standard.
    For example, the thick reflective layer formed on the buffer layer by chemical vapor deposition (CVD) or sputtering may be formed of gold, aluminum, silver, copper, chromium, nickel, platinum, aluminum-titanium, copper-aluminum, or the like. It is preferable that it is a metal layer. This thick layer should not be transparent to laser light. Since aluminum is cheaper than gold and the reflectance of the aluminum layer having a thickness of 50 nm or more is sufficiently high, aluminum or an alloy thereof is preferable as the thick reflective layer. In the conventional CD, an optical transmission rate of 0-5% is preferable. For high density CDs, a transfer rate of less than 55% is desirable.
    The protective coating 5 may be a resin that is highly resistant to impact. Usually UV curable resins are used, which are cured by UV radiation after spin coating is applied. Other materials suitable for protective coatings are epoxy resins, acrylate resins, silicone hard coat resins and urethane resins. Although the thickness of the protective coating is not critical, it is usually within 3 to 30 μm, preferably within 5 to 15 μm.
    The invention also relates to a method of manufacturing the optical recording medium according to the invention. This method includes the following steps.
    Applying a partially reflective film onto the grooved substrate,
    Applying a buffer layer on the partially reflective film,
    Applying a thick reflective layer onto the buffer layer.
    As mentioned above, the partial reflecting film and the thick reflecting layer may be applied by, for example, vacuum deposition, electron beam deposition or sputtering. The buffer layer may be applied by spin coating, for example.
    This manufacturing method can be easily configured in a continuous process. The apparatus for manufacturing a conventional read-only CD can be easily changed in the manufacture of the optical recording medium according to the present invention by inserting a means for applying a partial reflection film and a means for applying a buffer layer to a conventional production line. The invention also relates to an apparatus for the continuous manufacture of an optical record carrier according to the invention, comprising the following means.
    Means for transporting the substrate with grooves,
    Means for applying a partially reflective film on the substrate,
    Means for applying a buffer layer on the partially reflective film,
    Means for applying a thick reflective layer on the buffer layer.
    The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
    Example 1
    It has been calculated by computer program whether the combination of the layer thicknesses of the buffer layer and the partial reflecting film can be found in the partially reflecting film material having various complex refractive indices when the following requirements for reflectance and tracking are required. In the unrecorded state the reflectance of the land must be higher than 0.65, in the unrecorded state the reflectivity of the track is higher than 0.5, and the tracking contrast divided by the reflectivity of the track by the reflectivity of the land (not all recorded) must be lower than 0.95. Partial reflective film material with complex refraction coefficients present in pentagons defined as vertices 7.15 + i3.93, 7.15 + i5.85, 8.96 + i6.28, 9.56 + i5.90, and 8.14 + i3.77 in n, k plane It was calculated that no suitable combination of layer thicknesses satisfying the reflectance and tracking conditions could be found. The result of this calculation is shown in FIG. 3, which shows the ratio of the total amount of solution that satisfies the reflectance and tracking conditions for all combinations of n and k. In zone 1 no solution was found. In Region 2, about 10% of the solutions were found. In region 3 a solution of 10% to 80% was found. In Zone 4, over 90% of the solutions were found. Compact discs were designed according to a solution provided by a computer program.
    Example 2
    Synthesis of non-LC glass (common method):
    A mixture of 1eq of a compound containing two amine groups (diamine) and 4eq of a compound containing one oxirane group (epoxide) was used at 130 ° C. in a nitrogen atmosphere. Heated for 5-20 hours. When two or more different diamines or epoxides were used, 40 wt% of chlorobenzene was added to obtain a uniform melt. After 1 hour at 130 ° C., chlorobenzene was distilled off. The lysate was cooled and dissolved in tetrahydrofuran, and about 20% (m / M) of solution precipitated out more than 10 times of ethanol. Yield ranged from 75 to 90%.
    Example 3
    Epoxide Synthesis of Cyanobiphenyl (Epoxide 1)
    A mixture of 39.0 g (0.20 mole) hydroxycyanobiphenyl, 100 ml (1.25 moles) of epichlorohydrin and 0.44 g (2.4 mmoles) of benzyl trimethylammonium chloride was heated to 70 ° C. It was. Next, a solution of 17 g (0.42 mole) of sodium hydroxide in 100 ml of water was dispersed for 3 hours. This addition is followed by agitation again at 70 ° C. for 1 hour. The reaction compound was cooled to 20 ° C. and 200 ml of dichloromethane were added. The organic layer is separated and washed successively with sodium chloride and water. After drying over magnesium sulfate and concentration by evaporation, the crude product was converted to crystalline form from 450 ml of methanol. The yield was 38.3 g (76%).
    Example 4
    Epoxide Synthesis of p-Biphenyl (Epoxide 2)
    The epoxide of p-biphenyl (epoxide 2) was prepared in a similar manner to the epoxide synthesis of cyanobiphenyl.
    Example 5
    Glass using Aldrich's 3,3'-sulfonyl dianiline as a general method of synthesizing the non-LC glass described above when using 10% o-biphenyl epoxide of Janssen and 90% epoxide 1 (glass 1 ) Was prepared. Tg 99-104 ° C., MW 1706 (GPC).
    Example 6
    Glass (glass 2) was prepared with 3,3'-sulfonyl dianiline of Aldrich by the general method of synthesizing the above non-LC glass when using epoxide 2. Tg 84-87 ° C., MW 1232 (GPC).
    Example 7
    A 10 nm thick thin aluminum film was deposited on a 1.2 mm thick polycarbonate substrate having a pregroove of 170 nm deep, 0.5 μm wide and 1.6 μm track pitch. On this thin layer of aluminum a layer of glass 1 was spin coated from a solution of diacetone alcohol (0.9 g in 10 ml). The thickness of the buffer layer was 250 nm. A 100 nm thick aluminum layer was vacuum deposited on the buffer layer. After drying in a vacuum oven at 40 ° C., a protective layer of UV curable epoxyacrylate resin is spin coated on it and cured. The CD thus produced is evaluated using an evaluation facility using a laser beam of 780 nm. A signal-to-noise ratio (CNR) of 51 dB is achieved by 8 mW recording conditions of 1.3 m / sec, 720 mW and 0.7 mW recording power, with 72% reflectivity in the land and approximately 50% reflectance in the track. Lose. This disc appeared to be playable on a compact disc player.
    权利要求:
    Claims (8)
    [1" claim-type="Currently amended] a) a transparent substrate having grooves,
    b) located on the transparent substrate and within the pentagons defined by the vertices of 7.15-i3.93, 7.15-i5.85, 8.96-i6.28, 9.56-i5.90 and 8.14-i3.77 in the n, k plane A partial reflection film 2 composed of a material having a large complex refractive index that does not exist, a buffer layer 3 comprising a high molecular weight material and optionally dyes, which is not a liquid crystal located on the partial reflection film, and positioned on the buffer layer And a thick reflective layer 4 forming Fabry-Perot together with the buffer layer, wherein the thickness d of the buffer layer inside the groove is set so that the reflection of the medium is in a highly reflective state; and
    c) an optical recording medium, optionally comprising a protective coating (5) positioned on said layer.
    [2" claim-type="Currently amended] The method of claim 1,
    The reflectance inside the groove of the medium is greater than 50% in the unrecorded state, less than 40% in the recorded state, and in the high density optical recording medium the reflectance is greater than 20% in the unrecorded state. media.
    [3" claim-type="Currently amended] The method according to claim 1 or 2,
    The partial reflecting film (2) comprises aluminum, nickel, vanadium, chromium, tantalum or an alloy thereof.
    [4" claim-type="Currently amended] The method according to claim 1 or 2,
    The partial reflecting film (2) comprises gold, silver, copper, tellurium or alloys thereof or silicon nitride, silicon or silicon-germanium.
    [5" claim-type="Currently amended] The method according to any one of claims 1 to 4,
    The substrate is an optical recording medium, characterized in that consisting of polycarbonate or amorphous polyolefin.
    [6" claim-type="Currently amended] The method according to any one of claims 1 to 5,
    The buffer layer is an optical recording medium, characterized in that it comprises a dye absorbing in the wavelength range of 400 to 700 nm or 780 to 850 nm.
    [7" claim-type="Currently amended] Applying a partially reflective film on the grooved substrate,
    Applying a buffer layer on the partially reflective film; and
    The method of manufacturing an optical recording medium according to any one of claims 1 to 6, comprising applying a thick reflective layer on the buffer layer.
    [8" claim-type="Currently amended] Means for transporting the substrate with grooves,
    Means for applying a partially reflective film onto the substrate,
    Means for applying a buffer layer on the partially reflective film;
    A continuous manufacturing apparatus of an optical recording medium according to any one of claims 1 to 6, comprising means for applying a thick reflective layer on the buffer layer.
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    同族专利:
    公开号 | 公开日
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    JP2000516007A|2000-11-28|
    CZ168398A3|1998-12-16|
    EA199800501A1|1998-12-24|
    EA000524B1|1999-10-28|
    CA2239067A1|1997-06-12|
    HK1016317A1|2001-05-04|
    DE69605685T2|2000-06-21|
    NZ323928A|1999-08-30|
    WO1997021216A1|1997-06-12|
    CZ289559B6|2002-02-13|
    PL327081A1|1998-11-23|
    AU1097597A|1997-06-27|
    DE69605685D1|2000-01-20|
    IL124700D0|1998-12-06|
    NO982484L|1998-07-29|
    US5925433A|1999-07-20|
    EP0868721A1|1998-10-07|
    AU717242B2|2000-03-23|
    ES2143246T3|2000-05-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1995-12-01|Priority to EP95203301.7
    1995-12-01|Priority to EP95203301
    1995-12-15|Priority to US60/008,711
    1995-12-15|Priority to US871195P
    1995-12-15|Priority to KR101995050705
    1995-12-15|Priority to EP95203502
    1995-12-15|Priority to KR19950050705
    1995-12-15|Priority to KR95/50705
    1995-12-15|Priority to EP95203502.0
    1996-11-28|Application filed by 윤종용, 삼성전자 주식회사, 샬크비즈크 피이터 코르넬리스 ; 페트 귄터, 아크조 노벨 엔. 브이.
    1996-11-28|Priority to PCT/EP1996/005373
    1999-09-27|Publication of KR19990071730A
    优先权:
    申请号 | 申请日 | 专利标题
    EP95203301.7|1995-12-01|
    EP95203301|1995-12-01|
    US871195P| true| 1995-12-15|1995-12-15|
    KR101995050705|1995-12-15|
    EP95203502|1995-12-15|
    US60/008,711|1995-12-15|
    KR19950050705|1995-12-15|
    KR95/50705|1995-12-15|
    EP95203502.0|1995-12-15|
    PCT/EP1996/005373|WO1997021216A1|1995-12-01|1996-11-28|Optical recording medium based on fabry-perot principle|
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