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  Recording medium and information recording and reproducing method using the sameUSPTO Application #: 20060194151Title: Recording medium and information recording and reproducing method using the same Abstract: A recording medium comprises a substrate and a recording layer overlaid on the substrate. The recording layer comprises a material, which has properties such that, when recording light having a predetermined wavelength λ1 is irradiated to the material, the material is capable of being caused to change into a fluorescent material and such that, when excitation light having a wavelength λ2 is then irradiated to the thus formed fluorescent material, the fluorescent material is capable of being caused to produce fluorescence. The wavelength λ1 of the recording light and the wavelength λ2 of the excitation light may be identical or different. The substrate may be constituted of a material having properties such that, when the excitation light is irradiated to the material, the material does not produce fluorescence having a wavelength identical with the wavelength of the fluorescence produced by the fluorescent material. (end of abstract)
Agent: Sughrue Mion, PLLC - Washington, DC, US Inventors: Yoshio Inagaki, Masayuki Naya USPTO Applicaton #: 20060194151 - Class: 430270110 (USPTO) Related Patent Categories: Radiation Imagery Chemistry: Process, Composition, Or Product Thereof, Imaging Affecting Physical Property Of Radiation Sensitive Material, Or Producing Nonplanar Or Printing Surface - Process, Composition, Or Product, Radiation Sensitive Composition Or Product Or Process Of Making, Optical Recording Nonstructural Layered Product Having A Radiation Sensitive Composition Layer Claimed Or Solely Disclosed As Optically Reorderable And Optically Machine Readable The Patent Description & Claims data below is from USPTO Patent Application 20060194151. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] This is a divisional of application Ser. No. 09/793,721 filed Feb. 27, 2001. The entire disclosure of the prior application, application Ser. No. 09/793,721 is hereby incorporated by reference. FIELD OF THE INVENTION [0002] This invention relates to a recording medium. This invention particularly relates to a recording medium provided with a recording layer comprising a material, which has properties such that, when light having a predetermined wavelength is irradiated to the material, the material is capable of being caused to change into a fluorescent material. This invention also relates to a method and apparatus for recording information, in which the recording medium is utilized. This invention further relates to a method and apparatus for reproducing information, in which the recording medium is utilized. DESCRIPTION OF THE RELATED ART [0003] There have heretofore been proposed various recording media, each of which is provided with a recording layer having properties such that, when light, such as a laser beam having been converged into a small beam diameter, is irradiated to the recording layer, a change in characteristics is caused to occur at a local area limited site of a material constituting the recording layer. By the utilization of the properties of the recording layers of the recording media, information, such as image information or computer data, is capable of being recorded on the recording media. As the recording media described above, recording media, such as CD-R disks, wherein only one piece of information is capable of being recorded at a single point on the recording layer, were popular in the past. Recently, recording media enabling multiple recording, wherein multiple pieces of information are capable of being recorded at a single point on the recording layer and the information is thus capable of being recorded at a high density, have been proposed. [0004] As the recording media described above, recording media provided with recording layers constituted of fluorescent materials have been proposed. With the conventional recording media of the types described above, ordinarily, recording and reproduction of information are performed by the utilization of the characteristics such that, when recording light is irradiated to the recording layer constituted of the fluorescent material and excitation light acting as reproducing light is then irradiated to the site on the recording layer, which site has been exposed to the recording light, the intensity of the fluorescence, which is produced from the site having been exposed to the recording light, becomes lower than the intensity of the fluorescence, which is produced from the site having not been exposed to the recording light, or the wavelength of the fluorescence, which is produced from the site having been exposed to the recording light, varies from the wavelength of the fluorescence, which is produced from the site having not been exposed to the recording light. [0005] However, with the conventional techniques for performing the recording and the reproduction of the information in the manner described above, in cases where the excitation light is irradiated to the site having not been exposed to the recording light, as in cases where the excitation light is irradiated to the site having been exposed to the recording light, the fluorescence is produced from the site having not been exposed to the recording light, though the intensity or the wavelength of the fluorescence varies from the intensity or the wavelength of the fluorescence produced from the site having been exposed to the recording light. Therefore, the problems occur in that the fluorescence produced from the site having not been exposed to the recording light acts as a background, and a reproduced signal having a high signal-to-noise ratio cannot always be obtained. SUMMARY OF THE INVENTION [0006] The primary object of the present invention is to provide a recording medium, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained by the utilization of production of fluorescence. [0007] Another object of the present invention is to provide an information recording method, wherein information is capable of being recorded on the recording medium. [0008] A further object of the present invention is to provide an apparatus for carrying out the information recording method. [0009] A still further object of the present invention is to provide an information reproducing method, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained from the recording medium. [0010] Another object of the present invention is to provide an apparatus for carrying out the information reproducing method. [0011] A further object of the present invention is to provide a recording medium, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained by the utilization of production of fluorescence, and wherein multi-valued information is capable of being recorded at a recording unit, such as a single pit. [0012] A still further object of the present invention is to provide a multi-valued information recording method, wherein multi-valued information is capable of being recorded on the recording medium. [0013] Another object of the present invention is to provide an apparatus for carrying out the multi-valued information recording method. [0014] A further object of the present invention is to provide a multi-valued information reproducing method, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained from the recording medium. [0015] A still further object of the present invention is to provide an apparatus for carrying out the multi-valued information reproducing method. [0016] Another object of the present invention is to provide a recording medium, wherein multiple recording is capable of being performed, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained, and wherein the recording medium is capable of being produced with a high producibility. [0017] A further object of the present invention is to provide an information recording method, wherein multiple recording of information is capable of being performed at a high density on the recording medium. [0018] A still further object of the present invention is to provide an apparatus for carrying out the information recording method for the multiple recording. [0019] Another object of the present invention is to provide an information reproducing method, wherein a reproduced signal having a high signal-to-noise ratio is capable of being obtained from the recording medium, on which the multiple recording has been performed. [0020] A further object of the present invention is to provide an apparatus for carrying out the information reproducing method, wherein the reproduced signal is capable of being obtained from the recording medium, on which the multiple recording has been performed. Continue reading... Full patent description for Recording medium and information recording and reproducing method using the same Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Recording medium and information recording and reproducing method using the same patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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