Patents by Inventor Natsuko Nobukuni
Natsuko Nobukuni has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7561502Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: January 26, 2007Date of Patent: July 14, 2009Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 7452582Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2–1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60–80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15–25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: May 18, 2000Date of Patent: November 18, 2008Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 7408852Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: January 26, 2007Date of Patent: August 5, 2008Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 7345977Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2–1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60–80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15–25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: May 19, 2005Date of Patent: March 18, 2008Assignee: Mitsubishi Kagaku Media Co., LtdInventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 7333414Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: June 10, 2004Date of Patent: February 19, 2008Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Publication number: 20070177477Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: ApplicationFiled: January 26, 2007Publication date: August 2, 2007Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Publication number: 20070127342Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an-optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: ApplicationFiled: January 26, 2007Publication date: June 7, 2007Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 7085215Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . . , ?iT, ?iT, . . .Type: GrantFiled: September 2, 2005Date of Patent: August 1, 2006Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Michikazu Horie
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Patent number: 7050377Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . .Type: GrantFiled: September 9, 2003Date of Patent: May 23, 2006Assignee: Mitsubishi Chemical CorporationInventors: Natsuko Nobukuni, Michikazu Horie
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Patent number: 7027371Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2–1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60–80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15–25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: GrantFiled: January 13, 2004Date of Patent: April 11, 2006Assignee: Mitsubishi Chemical CorporationInventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Publication number: 20060013098Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . . , ?iT, ?iT, . . .Type: ApplicationFiled: September 2, 2005Publication date: January 19, 2006Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Natsuko Nobukuni, Michikazu Horie
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Publication number: 20050207310Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: ApplicationFiled: May 19, 2005Publication date: September 22, 2005Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Publication number: 20040246835Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: ApplicationFiled: June 10, 2004Publication date: December 9, 2004Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Publication number: 20040190407Abstract: In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less.Type: ApplicationFiled: January 13, 2004Publication date: September 30, 2004Inventors: Natsuko Nobukuni, Takashi Ohno, Masae Kubo, Michikazu Horie
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Patent number: 6661760Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into &eegr;1T, &agr;1T, &bgr;1T, &agr;2T, &bgr;2T, . . . , &agr;iT, &bgr;iT, . . .Type: GrantFiled: May 10, 2002Date of Patent: December 9, 2003Assignee: Mitsubishi Chemical CorporationInventors: Natsuko Nobukuni, Michikazu Horie
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Publication number: 20020159366Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths.Type: ApplicationFiled: May 10, 2002Publication date: October 31, 2002Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Natsuko Nobukuni, Michikazu Horie
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Patent number: 6411579Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into &eegr;nT,&agr;1T, &bgr;1T, &agr;2T, &bgr;2T, . . . , &agr;1T, &bgr;1T, . . .Type: GrantFiled: June 20, 2001Date of Patent: June 25, 2002Assignee: Mitsubishi Chemical CorporationInventors: Natsuko Nobukuni, Michikazu Horie
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Publication number: 20010053115Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths.Type: ApplicationFiled: June 20, 2001Publication date: December 20, 2001Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Natsuko Nobukuni, Michikazu Horie
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Patent number: RE42786Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . . , ?iT, ?iT, . . .Type: GrantFiled: April 16, 2004Date of Patent: October 4, 2011Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Michikazu Horie
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Patent number: RE45001Abstract: An optical recording method for recording mark length-modulated information on a recording medium by using a plurality of recording mark lengths. The optical recording method comprises the steps of: when a time length of one recording mark is denoted nT (T is a reference clock period equal to or less than 25 ns, and n is a natural number equal to or more than 2), (i) dividing the time length of the recording mark nT into ?1T, ?1T, ?1T, ?2T, ?2T, . . . , ?iT, ?iT, . . .Type: GrantFiled: July 8, 2011Date of Patent: July 8, 2014Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Natsuko Nobukuni, Michikazu Horie