• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    In the optical information recording medium of the present invention, a first recording layer having a translucent film and a second recording layer having a reflective film are stacked. At least one first recording layer is provided, and the translucent film reversibly changes its reflectance and transmittance in response to a temperature change caused by a difference in the condensed state of the reproduction light. As a result, the reproduced light reflected from the first and second recording layers can be obtained with a sufficient light amount.
    公开号:KR20020087868A
    申请号:KR1020020026209
    申请日:2002-05-13
    公开日:2002-11-23
    发明作者:타카모리노부유키；타카하시아키라；타지마히데하루
    申请人:샤프 가부시키가이샤；
    IPC主号:
    专利说明:

    Optical information recording medium {OPTICAL INFORMATION RECORDING MEDIUM}
    [6] The present invention relates to an optical information recording medium such as an optical disc for optically recording and reproducing information by, for example, a laser beam.
    [7] An optical disk such as a DVD (Digital Versatile Disk) is formed by joining two transparent plastic substrates each having a thickness of 0.6 mm, for example. On the bonding surface of these transparent plastic substrates (hereinafter referred to as substrates), a recording layer made of uneven pits is formed.
    [8] In this type of optical disc, there are a plurality of types of DVDs for reproduction, which are called two-layer discs, each having a recording layer on the two substrates. In this two-layer disc, for example, as disclosed in Japanese Laid-Open Patent Publication No. 2000-285517 (published date: October 13, 2000), each recording layer is provided on the opposite side of each of the two substrates. Are provided, and the surfaces on the side of these recording layers are bonded by a transparent resin layer.
    [9] In this two-layer disc, reproduction light enters through one disc surface at the time of reproduction to access two different recording layers. Therefore, there is an advantage that the both recording layers can be accessed in a short time.
    [10] The first recording layer, which is the recording layer on the reproduction light incident side, has a translucent film, and the translucent film is designed to reflect a part of the incident reproduction light and to transmit the rest.
    [11] Therefore, the reproduction light can also reach the second recording layer located far from the incident side of the reproduction light. The reflected light in the second recording layer is again extracted after passing through the first recording layer, whereby the second recording layer can be reproduced.
    [12] In the two-layer disc, the first recording layer and the second recording layer are spaced apart by a distance at which the reproduction signals of each other do not interfere with each other by the spacer which is the transparent resin layer. Therefore, by adjusting the focal position of the objective lens to a position corresponding to each recording layer, the information of each recording layer can be reproduced with high quality.
    [13] In such a reproduction method, the reproduction signal characteristics vary greatly by the design of the translucent film of the first recording layer.
    [14] Conventionally, Au or Ag alloys are generally used as materials for semitransparent films because they satisfy optical characteristics such as desired reflectance and transmittance and can be easily formed into thin films by sputtering or the like.
    [15] In addition, the alloy has the advantage of obtaining stable coating property against the fine concavo-convex pits formed in the recording layer and excellent in weather resistance as an optical information recording medium.
    [16] Also, Japanese Patent Application Laid-Open No. 2000-285517 proposes an optical information recording medium having a translucent film made of AgPdCu alloy thin film containing Pd and Cu, in order to reduce the cost and improve weather resistance of the translucent film.
    [17] However, in the above conventional technique, for example, in any of the reproduction of the first recording layer and the reproduction of the second recording layer, a sufficient amount of reproduction light is obtained, thereby obtaining a high signal strength to enable stable reproduction. The structure to make is not examined enough.
    [18] The same applies to the configuration suitable for the optical information recording medium having a plurality of first recording layers. In view of the above, for example, the translucent film made of Au or the translucent film made of the Ag alloy described in the above publication has optical limits in reflectance and transmittance.
    [19] For this reason, a reproduction signal is used when the translucent films are used for a disk composed of a plurality of recording layers or a recording / playable recording film (a magneto-optical recording film, a phase change recording film, etc.) requiring a large amount of reflected light. Problems with lack of strength arise.
    [20] SUMMARY OF THE INVENTION An object of the present invention is to provide an optical information recording medium in which a sufficient reproduction signal strength can be obtained in a configuration having a plurality of recording layers, thereby enabling stable reproduction.
    [21] In order to achieve the above object, the optical information recording medium of the present invention is an optical information recording medium in which a first recording layer having a translucent film and a second recording layer having a reflective film are stacked, wherein at least one first recording layer is provided. The semitransparent film is provided with a reversible change in reflectance and transmittance in response to a temperature change caused by a difference in the condensed state of the irradiated light.
    [22] According to the optical information recording medium, the translucent film of the first recording layer has a temperature change due to a difference in the condensed state of the irradiated light, that is, a temperature rise when the irradiated light (for example, the laser beam) is condensed, and the non-condensed state. In accordance with the temperature decrease in the case, the reflectance and transmittance reversibly change.
    [23] Accordingly, the semitransparent film is in a light transmissive state, for example, in a discolored state, in which the reflectance is low and the transmittance is high in a relatively low temperature in which irradiated light is not condensed. On the other hand, in the state where the temperature where irradiation light is condensed is high, it becomes a color development state with high reflectance and low transmittance, for example.
    [24] For example, in the case of reproducing the first recording layer, the reproduction light is brought into a state of condensing on the first recording layer (which is in focus) and irradiated as a reproduction light spot. In this case, the temperature of the spot irradiated portion in the translucent film, especially the central portion with strong light energy, rises locally.
    [25] And this temperature rise part develops, for example, color, and a reflectance becomes high (transmittance falls). Therefore, the reproduced light is surely reflected by the translucent film, so that the reflected light having a sufficient amount of light to be the reproduced signal can be obtained.
    [26] On the other hand, for example, in the case of reproducing the second recording layer, the reproduction light is irradiated in a state of condensing on the second recording layer. In this case, since the reproduction light is not collected in the first recording layer, the temperature becomes relatively low.
    [27] As a result, the translucent film becomes, for example, a discolored state, and the light transmittance is high (the reflectance is lowered). As a result, the reproduction light can pass through the first recording layer and reach the second recording layer.
    [28] The reproduction light which has reached the second recording layer is reflected by the reflection film of the second recording layer, becomes a reproduction signal, and is again taken out through the first recording layer. Therefore, even in this case, it is possible to obtain reflected light having a sufficient amount of light to be a reproduction signal.
    [29] The above operation is performed in the same manner even when a plurality of first recording layers are provided, and as a result, the recording information can be read out while keeping the signal quality above a certain level from all the recording layers.
    [30] Still other objects, features, and advantages of the present invention will be fully understood by the following description. Further advantages of the present invention will become apparent from the following description with reference to the accompanying drawings.
    [1] 1 is a side view showing an optical information recording medium according to an embodiment of the present invention.
    [2] Fig. 2 is a side view showing a first recording layer of the optical information recording medium.
    [3] 3 is a side view showing a second recording layer of the optical information recording medium.
    [4] 4A is an explanatory diagram showing a mechanism of reproduction of the first recording layer of the optical information recording medium according to an embodiment of the present invention, and FIG. 4B is an explanatory diagram showing a mechanism of reproduction of the second recording layer. .
    [5] FIG. 5 is an explanatory diagram for explaining an example of the method for creating the optical information recording medium shown in FIG.
    [31] An embodiment of the present invention will be described with reference to FIGS. 1 to 5 as follows.
    [32] The optical information recording medium in this embodiment has a multilayer structure as shown in FIG. One of the outermost layers of the optical information recording medium is a transparent substrate 20 and the other is a transparent or opaque protective layer 22.
    [33] The transparent substrate 20 and the protective layer 22 are made of, for example, plastic such as polycarbonate, amorphous polyolefin, or ultraviolet curable acrylic resin.
    [34] The first recording layer 1 for recording information is provided on the inner layer side of the transparent substrate 20, and the second recording for recording information similarly on the inner layer side of the protective layer 22. Layer 2 is provided.
    [35] A transparent resin layer 21 having a predetermined thickness is provided between the first recording layer 1 and the second recording layer 2. That is, the transparent substrate 20 and the protective layer 22 are bonded by the transparent resin layer 21 through the first and second recording layers 1 and 2, thereby forming the optical information recording medium 3. It is.
    [36] As shown in Fig. 2, the first recording layer 1 is composed of a dielectric film 5, a recording film 6 and a translucent film 7.
    [37] The dielectric film 5 is made of a material such as SiN. As the recording film 6, a photomagnetic recording material made of TbFeCo or the like, a phase change recording material such as GeTeSb or AgInSb that can be optically recorded, or an organic dye material such as cyanine or phthalocyanine is used.
    [38] In addition, the semi-transparent film 7 (detailed later) is formed by the sputtering method, generally the magnetron sputtering method, for the reason of ease of manufacture, etc. In the first recording layer 1, as an information pit, for example, an uneven pattern and a guide groove corresponding to the information are formed.
    [39] As shown in Fig. 3, the second recording layer 2 is composed of the dielectric film 10, the recording film 11, and the reflective film 12.
    [40] The dielectric film 10 and the recording film 11 are each formed of the same material as the dielectric film 5 and the recording film 6 of the first recording layer 1.
    [41] The reflective film 12 is made of Al, Au, Ag, or an alloy thereof having a high reflectance, and is formed by the above-described sputtering method. In the second recording layer 2, like the first recording layer 1, for example, an uneven pattern and a guide groove according to the information are formed as information pits.
    [42] In the reproduction of the optical information recording medium 3, the reproduction light 26 (laser beam) is guided to the information pits of the unevenness of the first recording layer 1 or the second recording layer 2, and the reflected light is reflected. The playback signal is used.
    [43] Therefore, in order to reproduce information accurately, it is preferable that the reproduction signal intensity obtained from the first recording layer 1 and the second recording layer 2 is high (one having a large amount of reflected light).
    [44] In detail, the reproduction of the information pits formed in the first recording layer 1 is performed by the objective lens 25 whose focal position is adjusted so that the reproduction light 26 incident from the transparent substrate 20 side is incident. Focusing (condensing) on the first recording layer 1 is performed.
    [45] On the other hand, reproduction of the second recording layer 2 is performed by focusing the reproduction light 26 on the second recording layer 2 by the objective lens 25. For this reason, the following two functions are required for the translucent film 7.
    [46] (1) Reflect as much of the reproduction light as possible on the first recording layer 1 (recording film 6).
    [47] (2) To reach the second recording layer 2 (recording film 11) without blocking the reproduction light to the second recording layer 2 as much as possible.
    [48] In order to obtain the above function, the translucent film 7 of the optical information recording medium has the following configuration.
    [49] The translucent film 7 is a structure containing the material whose reflectance and transmittance change with temperature. That is, when the temperature rises, the translucent film 7 rises in reflectance and decreases in transmittance (high reflectance state), resulting in a colored state in which light is reflected.
    [50] On the other hand, when the temperature decreases, the reflectance decreases, and the transmittance increases (high transmittance state), resulting in a light transmissive discoloration state.
    [51] The temperature range of the said high reflectance state can be 60 degreeC-180 degreeC, for example, and the temperature range of the said high transmittance state can be 20 degreeC-60 degreeC, for example.
    [52] Specific materials used for the translucent membrane 7 include spiro pyrane, spironaphthooxazine, azobenzene, fulgide, or diallylethene as main components. A photochromic substance consisting of a compound to be used can be used.
    [53] The photochromic material is a material whose refractive index changes because a change in the compound structure occurs by absorbing photons (photons).
    [54] Moreover, you may use the thermochromism substance which added alkali to lactone or fluorene, and the thermochromism substance which added organic acid to the leuco pigment.
    [55] The thermochromic material is a material whose structural change occurs chemically by absorbing heat, and the refractive index changes.
    [56] Also, there is no correlation with the Sb, Ge, or an inorganic compound, a metal oxide composite composed mainly of Bi 2 O 3 -Cr 2 O 3 as a main component Si.
    [57] In addition, a heavy metal iodide containing Ag 2 HgI 4 or Cu 2 HgI 4 as a main component can be used.
    [58] The material of the semi-transparent film 7, such as a photochromic material or a thermochromic material, changes the refractive index in accordance with the condensed state of the regenerated light, that is, the state of temperature change generated by the collection of the light energy, thereby improving the reflectance and transmittance. It is a material to change.
    [59] Specifically, in the material of the semi-transparent film, the refractive index changes due to condensation of regenerated light, that is, the temperature of light energy, and the reflectance increases (colored state).
    [60] On the other hand, in the state where the regenerated light does not collect and the temperature is relatively low, the transmittance of the light increases (the reflectance decreases). Therefore, it is suitable as a material of the said translucent film.
    [61] However, the translucent film 7 generally has a high reflectance and a high transmissivity at the same time as the film thickness increases. For this reason, it is necessary to set the film thickness necessary for sufficiently reflecting the reproduction light. In this embodiment, the semitransparent film is preferably 2 to 100 nm.
    [62] When the film thickness of the semitransparent film is 2 to 100 nm, it is difficult to form a uniform thin film when it is thinner than 2 nm, and when it is thicker than 100 nm, light cannot be absorbed and sufficient amount of reflected light cannot be secured. Because.
    [63] Next, referring to Figs. 4A and 4B, the mechanism of reproduction of the optical information recording medium having the translucent film 7 will be described.
    [64] 4A shows a case of reproducing the first recording layer 1. In this case, the reproduction light 26 is focused on the first recording layer 1, and spot irradiation is performed.
    [65] As a result, the spot irradiated portion of the translucent film 7, in particular, the central portion having strong light energy, locally rises in temperature, and the portion below the spot radius of the reproduced light 26 is colored, thereby increasing the reflectance.
    [66] Therefore, the function of ① is satisfied. That is, the translucent film 7 can reflect the reproduction light 26 and generate the reflected light which becomes a reproduction signal.
    [67] 4B shows a case of reproducing the second recording layer 2. In this case, the reproduction light 26 is focused on the second recording layer 2, and spot irradiation is performed. Therefore, the reproduction light 26 is in a defocused state (non-condensing state) in the first recording layer 1, and no light energy is collected in the first recording layer 1. Thereby, the temperature rise by this light energy does not generate | occur | produce, ie, it is a state where the temperature is relatively low.
    [68] As a result, the translucent film in the first recording layer 1 becomes discolored, and the light transmittance increases. This satisfies the above function ②. That is, the reproduction light 26 can pass through the first recording layer 1 and reach the second recording layer 2.
    [69] Thereafter, the regenerated light reaching the second recording layer 2 is reflected by the reflective film 12 in the second recording layer 2, and the reflected light is again the first recording layer having the translucent film 7. Through (1), it is used as a reproduction signal.
    [70] As described above, when the reproduction light 26 is focused on the first recording layer 1 which is a layer near the incident side of the reproduction light 26, the translucent film 7 of the first recording layer 1 The temperature rises and the reflectance increases (transmittance decreases). Therefore, the reproduction light 26 reflected by the translucent film 7 is in a state with a sufficient amount of light, and the reproduction signal using this reproduction light 26 becomes good.
    [71] In addition, when the reproduction light 26 is focused on the second recording layer 2 which is a layer far from the incident side of the reproduction light 26, the translucent film 7 of the first recording layer 1 has a high temperature. Since it does not rise, the transmittance increases (reflectance decreases). Therefore, the reproduction light 26 can penetrate the first recording layer 1 and reach the second recording layer 2, is reflected by the reflection film 12, and again passes through the semi-transparent film 7. It is taken out in a state having light quantity. As a result, the reproduction signal using this reproduction light 26 becomes favorable.
    [72] As described above, in the optical information recording medium, even when one of the first recording layer 1 and the second recording layer 2 is reproduced, the reduction in the amount of reflected light of the reproduction light 26 can be suppressed. Therefore, sufficient reproduction signal strength can be secured.
    [73] That is, in the optical information recording medium having a plurality of recording layers, it is possible to read the recording information from all of the recording layers while maintaining the signal quality at a certain level or more.
    [74] The optical information recording medium of this embodiment can be manufactured, for example, by the method shown in FIG. At the time of manufacture, the disk 30 which has the information pit and the surface (information recording surface) in which the information pit of the 2nd recording layer was engraved is prepared.
    [75] First, a laminate in which the first recording layer 1 is laminated on the transparent substrate 20 is formed. Next, the laminate and the master 30 are bonded to each other in a state where the surface on the first layer recording layer 1 side of the laminate and the information recording surface of the master 30 face each other, for example, by ultraviolet curing acrylic resin. Let's do it.
    [76] The ultraviolet curable acrylic resin is cured by ultraviolet irradiation to form a transparent resin layer 21. The thickness of the transparent resin layer 21 is preferably 5 to 100 µm in order to ensure a distance from which the reproduction signals from the first recording layer 1 and the second recording layer 2 do not interfere with each other.
    [77] Next, the disk 30 is peeled off from the transparent resin layer 21. Thereby, the information recording surface (information pits and grooves) of the master 30 can be transferred to the transparent resin layer 21.
    [78] Thereafter, the dielectric film 10, the recording film 11, and the reflective film 12 are sequentially stacked on the information recording surface of the transparent resin layer 21 to form the second recording layer 2.
    [79] In addition, a protective layer 22 is provided on the second recording layer 2 to form an information recording medium. The protective layer 22 is formed by applying an ultraviolet curable resin by spin coating and then irradiating and curing ultraviolet rays. As for the thickness of such a protective layer, about 1-30 micrometers is preferable.
    [80] In the disc having two recording layers in the embodiment of the present invention, for example, MD (Mini Disk), CD (Compact Disk), CD-R (Compact Disk-Recordable), CD-RW (CompactDisk-ReWritable), CD-R0M (Compact Disk-Read 0nly Memory), DVD, DVD-R, DVD-RW, DVD-ROM, Digital Versatile Disk-Random Access Memory (DVD-RAM), DVD + RW, Magnet-0ptical (MO), etc. Disk type optical disks, but are not limited to these.
    [81] In addition, although two recording layers are shown in the embodiment of the present invention, for example, an optical disc, a magneto-optical disc, a phase change type optical disc, other card type or sheet type recording medium, etc. having one or three or more recording layers, It can be applied to various optical information recording media having a metal thin film in the recording layer.
    [82] As an optical information recording medium having only one recording layer, for example, a structure having the recording film 6 above the reflective film made of the translucent film 7 (light incidence side), for example, the first recording layer 1 It can be set as the structure which has).
    [83] In this optical information recording medium, a portion corresponding to the reflective film is a material which causes a change in refractive index by temperature. For this reason, the reflectance and transmittance of the reflection film change reversibly only in the central portion where the temperature rises due to the concentration of irradiation light. As a result, only the center portion smaller than the spot radius of the irradiation light can be reproduced.
    [84] This is a reflection type super resolution reproducing method which is fundamentally different from the super resolution reproducing method in which the transmittance is changed on the conventional light incidence side.
    [85] In addition, in the above description, the mechanism of reproduction of the optical information recording medium has been described. However, when the optical information recording medium uses recording light for recording information in the first recording layer 1 and the second recording layer 2, that is, the optical information recording medium is also applied to the recording mechanism using the recording light. Needless to say.
    [86] Therefore, it is also possible to apply the information to an optical information recording medium such as CD-R, CD-RW, DVD-R, DVD-RW, and the like.
    [87] In addition, the structure of the optical information recording medium is not limited to the above structure. For example, an optical information recording medium formed by forming two or more recording layers on each of two transparent substrates, joining the transparent substrates with the surfaces having the recording layers to face each other, and irradiating light on both transparent substrate sides. It doesn't matter. As such, the optical information recording medium may have various structures.
    [88] In addition, this invention is not limited to the above-mentioned embodiment, It is clear that various other structures can be employ | adopted without deviating from the summary of this invention.
    [89] In the optical information recording medium of the present invention, the translucent film may be made of a material in which the refractive index of light changes with temperature change.
    [90] According to the above structure, since the refractive index of the light changes in accordance with the temperature change of the translucent film of the first recording layer, the reflectance and the transmittance can be appropriately changed according to the temperature change caused by the difference in the condensed state of the irradiated light.
    [91] In the optical information recording medium of the present invention, at least one compound selected from the group consisting of spiropyrane, spironaphthooxazine, azobenzene, fulgid, or diallylethene as a main component of the semitransparent film material is used. It may be comprised from the containing photochromic substance.
    [92] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [93] In the optical information recording medium of the present invention, the semi-transparent film may be made of a thermochromic material in which alkali is added to a compound containing lactone or fluorine as a main component.
    [94] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [95] In the optical information recording medium of the present invention, the semitransparent film may be made of a thermochromic material in which an organic acid is added to a leuco dye.
    [96] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [97] In the optical information recording medium of the present invention, the semi-transparent film may be made of at least one inorganic compound selected from the group consisting of inorganic compounds containing Sb, Ge, or Si as main components.
    [98] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [99] In the optical information recording medium of the present invention, the semitransparent film may be made of a metal oxide composite containing Bi 2 O 3 -Cr 2 O 3 as a main component.
    [100] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [101] In the optical information recording medium of the present invention, the semi-transparent film may be made of heavy metal iodide containing Ag 2 HgI 4 or Cu 2 HgI 4 as a main component.
    [102] According to the above configuration, the refractive index of the light can be changed according to the condensed state of the regenerated light, that is, the temperature change state caused by the light energy, so that the reflectance and the transmittance can be appropriately changed.
    [103] In the optical information recording medium of the present invention, the translucent film may have a thickness of 2 to 100 nm.
    [104] In general, the translucent film is known to have a high reflectance and a high transmittance at the same time as the film thickness increases. Therefore, as the preferable film thickness of the translucent film in the first recording layer, the film thickness was obtained.
    [105] By the film thickness, when the reproduced light is focused on the first recording layer, the reproduced light can be reflected. On the other hand, when the reproduced light is not focused, the reproduced light can be transmitted. Therefore, sufficient reproduction signal (reflected light) can be ensured from the first recording layer. The reproduction light passing through the first recording layer reaches the second recording layer and is then reflected by the reflective film of the second recording layer, thereby becoming a sufficient reproduction signal (reflected light).
    [106] Therefore, in the optical information recording medium having a plurality of recording layers, it is possible to read the recording information from all of the recording layers while maintaining the signal quality above a certain level.
    [107] Further, the optical information recording medium of the present invention may be a single film or a plurality of two or more films, and the recording layer can record information only once, not only for the function of reproduction. It may be a recordable type or a rewritable recording / reproducing type capable of recording information any number of times.
    [108] In the optical information recording medium of the present invention, in the optical information recording medium in which the first recording layer having a translucent film and the second recording layer having a reflective film are stacked as described above, at least one first recording layer is provided, In the translucent film, reflectance and transmittance reversibly change with temperature change due to a difference in the condensed state of irradiated light.
    [109] Therefore, in a configuration having a plurality of recording layers, sufficient reproduction signal strength can be obtained, whereby an optical information recording medium capable of stable reproduction can be provided.
    [110] The specific examples in the detailed description of the invention are intended to clarify the technical details of the present invention to the last, and are not to be construed as limited to such specific examples only, but within the spirit of the present invention and the claims set forth below. You can do this in a variety of ways.
    权利要求:
    Claims (13)
    [1" claim-type="Currently amended] An optical information recording medium in which a first recording layer having a translucent film and a second recording layer having a reflective film are laminated,
    At least one first recording layer is provided,
    The translucent film is an optical information recording medium in which the reflectance and transmittance reversibly change according to a temperature change caused by a difference in the condensed state of irradiated light.
    [2" claim-type="Currently amended] The optical information recording medium according to claim 1, wherein the translucent film comprises a material whose refractive index changes with temperature.
    [3" claim-type="Currently amended] The material of the translucent membrane according to claim 2, wherein the material of the semi-transparent membrane is a photochromium containing at least one compound selected from the group consisting of spiropyran, spironaphthooxazine, azobenzene, fulgid, or diallylethene as a main component. Optical information recording medium, which is a substance.
    [4" claim-type="Currently amended] The optical information recording medium according to claim 2, wherein the semitransparent film material is a thermochromic material in which alkali is added to a compound containing lactone or fluorene as a main component.
    [5" claim-type="Currently amended] The optical information recording medium according to claim 2, wherein the semitransparent film is made of a thermochromic material to which an organic acid is added to a leuco dye.
    [6" claim-type="Currently amended] The optical information recording medium according to claim 2, wherein the semitransparent film is made of at least one inorganic compound selected from the group consisting of inorganic compounds containing Sb, Ge, or Si as main components.
    [7" claim-type="Currently amended] The optical information recording medium according to claim 2, wherein the semitransparent film is made of a metal oxide composite containing Bi 2 O 3 -Cr 2 O 3 as a main component.
    [8" claim-type="Currently amended] The optical information recording medium according to claim 2, wherein the semitransparent film is made of heavy metal iodide having Ag 2 HgI 4 or Cu 2 HgI 4 as a main component.
    [9" claim-type="Currently amended] The optical information recording medium according to claim 1, wherein the semitransparent film has a film thickness of 2 to 100 nm.
    [10" claim-type="Currently amended] The optical information recording medium according to claim 1, wherein the recording layer is formed from a single film or a plurality of two or more films, and has a function of any one of a read-only type, a write-once type, and a record / play type.
    [11" claim-type="Currently amended] The optical information recording medium according to claim 1, wherein the translucent film has a high reflectance when the high temperature state is low, a low transmittance while a low reflectance when the low temperature state is low, and a high transmittance rate.
    [12" claim-type="Currently amended] The optical information recording medium according to claim 1, wherein a transparent resin layer is provided between the first recording layer and the second recording layer, and the film thickness of the transparent resin layer is 5 to 100 nm.
    [13" claim-type="Currently amended] An optical information recording medium comprising a translucent film whose reflectance and transmittance reversibly change in accordance with a temperature change caused by a difference in the condensed state of the irradiated light, and a recording layer having a recording film provided on the incident side of the irradiated light in the translucent film. .
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    同族专利:
    公开号 | 公开日
    KR100509621B1|2005-08-22|
    JP2002342980A|2002-11-29|
    US20020168588A1|2002-11-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2001-05-14|Priority to JPJP-P-2001-00143861
    2001-05-14|Priority to JP2001143861A
    2002-05-13|Application filed by 샤프 가부시키가이샤
    2002-11-23|Publication of KR20020087868A
    2005-08-22|Application granted
    2005-08-22|Publication of KR100509621B1
    优先权:
    申请号 | 申请日 | 专利标题
    JPJP-P-2001-00143861|2001-05-14|
    JP2001143861A|JP2002342980A|2001-05-14|2001-05-14|Optical information recording medium|
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