Patents by Inventor Masae Kubo
Masae Kubo 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: 8114496Abstract: Provided is an extremely high-density optical recording medium with excellent jitter characteristics and good recording/reproducing characteristics. An optical recording medium 20 comprises a substrate 21 with a guide groove formed therein, a layer 23 with a light reflection function, a recording layer 22 comprising a dye as a main component with a light absorption function for a wavelength of recording/reproducing light in an unrecorded state, and a cover layer 24 capable of transmitting the recording/reproducing light incident to the recording layer 22, in the order mentioned; an interlayer 30 containing at least one element selected from the group consisting of Ta, Nb, V, W, Mo, Cr and Ti, is provided between the layer 23 with the light reflection function and the recording layer 22.Type: GrantFiled: January 11, 2007Date of Patent: February 14, 2012Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Michikazu Horie, Kenjirou Kiyono, Masae Kubo
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Patent number: 8018823Abstract: An information recording medium having a recording track wherein the recording track includes a first recording region R1, a second recording region R2 and a recording region transition section Sx arranged between regions R1 and R2; a track pitch tp1, a groove width w1 and a groove depth d1 in region R1, and a track pitch tp2, a groove width w2and a groove depth d2 in region R2 satisfy formula (1), (2) and/or (3); the recording region transition section Sx includes a track pitch transition section Stp in which the track pitch changes from tp1 to tp2 and a groove shape transition section Sg in which the groove width changes from w1 to w2 and/or the groove depth changes from d1 to d2; and the track pitch transition section Stp and the groove shape transition section Sg at least partially overlap to share a region SL.Type: GrantFiled: November 28, 2007Date of Patent: September 13, 2011Assignee: Mitsubishi Kagaku Media Co., LtdInventors: Hidehiro Sasaki, Masae Kubo, Kenjirou Kiyono
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Patent number: 7858167Abstract: A rewritable optical recording medium including: a substrate having a guide groove formed thereon, a phase-change type recording layer, a portion in a crystalline state of the phase-change type recording layer corresponds to an unrecorded or erased state, and a portion in an amorphous state of the phase-change type recording layer corresponds to a recorded state, so that an amorphous mark corresponding to the recorded state is formed upon irradiation with a recording laser beam. The phase-change type recording layer contains Sb as a main component, and further contains Ge and/or Te, a content of Ge is from 1 atomic % to 30 atomic %, and a content of Te is from 10 atomic % to 30 atomic %, and in the phase-change type recording layer, Sb/Te is at least 4.5, and the atomic ratio of Ge to Te is from 1:3 to 1:20.Type: GrantFiled: March 12, 2007Date of Patent: December 28, 2010Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Takashi Ohno, Masae Kubo, Michikazu Horie, Masaaki Mizuno, Hiroyuki Hoshino, Akio Okamuro
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Publication number: 20100035013Abstract: An optical recording medium is provided which has excellent jitter characteristics and satisfactory recording/reproducing characteristics and is capable of extremely high-density recording. The optical recording medium 20 comprises a substrate 21 having a guide groove and the following layers formed on the substrate 21 in the following order: a layer 23 having a light-reflecting function, a recording layer 22 containing a specific porphyrin compound as a main component, and a cover layer 24 capable of transmitting a recording/reproducing light entering the recording layer 22, wherein when a portion of the guide groove at a side far from a surface where a recording/reproducing light beam enters the cover layer 24, is represented as a recording groove portion, then a recording pit portion formed in the recording groove portion, has a higher reflective optical intensity than the recording groove portion in an unrecorded state.Type: ApplicationFiled: September 5, 2007Publication date: February 11, 2010Applicant: Mitsubishi Kagaku Media Co., Ltd.Inventors: Masae Kubo, Kenjirou Kiyono, Takeshi Nakamura
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Publication number: 20100034074Abstract: Stable focus servo and tracking servo are realized in an information recording medium having a plurality of recording regions having different track pitches and groove shapes.Type: ApplicationFiled: November 28, 2007Publication date: February 11, 2010Applicant: Mitsubishi Kagaku Media Co., Ltd.Inventors: Hidehiro Sasaki, Masae Kubo, Kenjirou Kiyono
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Publication number: 20090269540Abstract: Provided is an extremely high-density optical recording medium with excellent jitter characteristics and good recording/reproducing characteristics. An optical recording medium 20 comprises a substrate 21 with a guide groove formed therein, a layer 23 with a light reflection function, a recording layer 22 comprising a dye as a main component with a light absorption function for a wavelength of recording/reproducing light in an unrecorded state, and a cover layer 24 capable of transmitting the recording/reproducing light incident to the recording layer 22, in the order mentioned; an interlayer 30 containing at least one element selected from the group consisting of Ta, Nb, V, W, Mo, Cr and Ti, is provided between the layer 23 with the light reflection function and the recording layer 22.Type: ApplicationFiled: January 11, 2007Publication date: October 29, 2009Applicant: Mitsubishi Kagaku Media Co.Ltd.Inventors: Michikazu Horie, Kenjirou Kiyono, Masae Kubo
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Patent number: 7609603Abstract: A rewritable optical recording medium includes a substrate and a phase-change type recording layer. A portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and the recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.55, at 24-times velocity or 32-times velocity of the reference velocity.Type: GrantFiled: March 12, 2007Date of Patent: October 27, 2009Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Takashi Ohno, Masae Kubo, Michikazu Horie, Masaaki Mizuno, Hiroyuki Hoshino, Akio Okamuro
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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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Patent number: 7313070Abstract: The present invention provides CD-RW which makes high velocity recording at a level of at least 24-times velocity possible, rewritable DVD which makes high velocity recording at a level of at least 6-times velocity possible, and a recording method therefor, while maintaining interchangeability with conventional CD-RW standards and rewritable DVD standards. A rewritable optical recording medium comprising a substrate and a phase-change type recording layer, wherein a portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and wherein recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.Type: GrantFiled: July 14, 2004Date of Patent: December 25, 2007Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Takashi Ohno, Masae Kubo, Michikazu Horie, Masaaki Mizuno, Hiroyuki Hoshino, Akio Okamuro
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Publication number: 20070237060Abstract: A rewritable optical recording medium including: a substrate having a guide groove formed thereon, a phase-change type recording layer, a portion in a crystalline state of the phase-change type recording layer corresponds to an unrecorded or erased state, and a portion in an amorphous state of the phase-change type recording layer corresponds to a recorded state, so that an amorphous mark corresponding to the recorded state is formed upon irradiation with a recording laser beam. The phase-change type recording layer contains Sb as a main component, and further contains Ge and/or Te, a content of Ge is from 1 atomic % to 30 atomic %, and a content of Te is from 10 atomic % to 30 atomic %, and in the phase-change type recording layer, Sb/Te is at least 4.5, and the atomic ratio of Ge to Te is from 1:3 to 1:20.Type: ApplicationFiled: March 12, 2007Publication date: October 11, 2007Applicant: Mitsubishi Kagaku Media Company Ltd.Inventors: Takashi Ohno, Masae Kubo, Michikazu Horie, Masaaki Mizuno, Hiroyuki Hoshino, Akio Okamuro
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Patent number: 7277376Abstract: An optical recording method to be used for recording at a high data transfer rate length-modulated marks on a recording medium by applying a recording laser beam locally to the recording medium. The recording laser beam has a writing power Pwi, is and a bias power Pbi. A record mark has a length of nT. With respect to at least two record marks, a pulse dividing number m is at least 2, and with respect to all record marks with m being at least 2, 2.5 is smaller than or equal to n/m, in a case where plural different record mark lengths are to be respectively formed by the same pulse dividing number m.Type: GrantFiled: October 18, 2005Date of Patent: October 2, 2007Assignee: Mitsubishi Kagaku Media Co., Ltd.Inventors: Michikazu Horie, Takashi Ohno, Kenjirou Kiyono, Masae Kubo
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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: 20070159945Abstract: A rewritable optical recording medium includes a substrate and a phase-change type recording layer. A portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and the recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.55, at 24-times velocity or 32-times velocity of the reference velocity.Type: ApplicationFiled: March 12, 2007Publication date: July 12, 2007Applicant: Mitsubishi Kagaku Media Co., Ltd.Inventors: Takashi OHNO, Masae KUBO, Michikazu HORIE, Masaaki MIZUNO, Hiroyuki HOSHINO, Akio OKAMURO
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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: 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: 20060062125Abstract: To provide an optical recording method to be used for recording at a high data transfer rate where the reference clock frequency is at least about 200 MHz and a linear velocity is about 40 m/sec. When recording mark length-modulated information is to be recorded on a recording medium by applying a recording laser beam locally to the recording medium, in order to form one record mark length of nT, m pieces of recording pulses ?iT (1?i?m) and m pieces of off-pulses ?iT (1?i?m), represented by: ?1T, ?1T, ?2T, ?2T, . . . , ?1T, ?1T, . . .Type: ApplicationFiled: October 18, 2005Publication date: March 23, 2006Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Michikazu Horie, Takashi Ohno, Kenjirou Kiyono, Masae Kubo