Patents by Inventor Etsuro Ikeda
Etsuro Ikeda 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: 8119215Abstract: A write-once type optical recording medium 10 has an inorganic recording film 2. The inorganic recording film 2 has an oxide film 2a containing an oxide of germanium (Ge) and an adjacent film 2b which contains titanium (Ti) and manganese (Mn) and is adjacent to the oxide film 2a.Type: GrantFiled: January 24, 2008Date of Patent: February 21, 2012Assignee: Sony CorporationInventors: Takemitsu Sakai, Yuichi Sabi, Etsuro Ikeda
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Patent number: 8075975Abstract: An optical recording medium is an optical recording medium having an inorganic recording film and has a transparent conductive film on the inorganic recording film. The inorganic recording film has a first recording film containing titanium (Ti) and a second recording film containing an oxide of germanium (Ge). The transparent conductive film is provided on the side of the second recording film. The transparent conductive film contains an oxide of tin (Sn).Type: GrantFiled: March 21, 2008Date of Patent: December 13, 2011Assignee: Sony CorporationInventors: Takemitsu Sakai, Etsuro Ikeda, Yuichi Sabi
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Patent number: 7924694Abstract: To accomplish write-once type optical recording mediums that have excellent recording and reproducing characteristics and producibility and that are capable of being fabricated at low cost. A write-once type optical recording medium 10 has the structure of which an inorganic recording film 6, a dielectric film 4, and a light transmission layer 5 have been successively formed on a substrate 1. The inorganic recording film 6 is composed of a metal film 2 and an oxide film 3 successively formed on the substrate 1. When light is radiated to the inorganic recording film 6, oxygen is separated from the oxide film 3 due to the light catalyst effect, resulting in increasing the oxygen concentration on the metal film 2 side and largely varying the optical constant.Type: GrantFiled: November 16, 2006Date of Patent: April 12, 2011Assignee: Sony CorporationInventors: Yuichi Sabi, Etsuro Ikeda, Fuminori Takase
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Publication number: 20100233413Abstract: A write-once type optical recording medium 10 has an inorganic recording film 2. The inorganic recording film 2 has an oxide film 2a containing an oxide of germanium (Ge) and an adjacent film 2b which contains titanium (Ti) and manganese (Mn) and is adjacent to the oxide film 2a.Type: ApplicationFiled: January 24, 2008Publication date: September 16, 2010Applicant: Sony CorporationInventors: Takemitsu Sakai, Yuichi Sabi, Etsuro Ikeda
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Patent number: 7787353Abstract: In an optical recording medium 1 having a configuration in which on one main surface of a substrate 2, a reflective layer 3, a lower dielectrics layer 4, a recording layer 5, an upper dielectrics layer 6 and a light transmissive layer 7 are sequentially laminated, the lower dielectrics layer 4 is formed of a first lower dielectrics layer and a second lower dielectrics layer that inhibits a material that constitutes the first lower dielectrics layer and a material that constitutes the reflective layer 3 from reacting, and the upper dielectrics layer 6 is formed of a first upper dielectrics layer and a second upper dielectrics layer that inhibits a material that constitutes the first upper dielectrics layer and a material that constitutes the light transmissive layer 7 from reacting.Type: GrantFiled: January 22, 2004Date of Patent: August 31, 2010Assignee: Sony CorporationInventors: Toru Abiko, Etsuro Ikeda, Nobuaki Furuichi, Fuminori Takase
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Publication number: 20100047503Abstract: An optical recording medium is an optical recording medium having an inorganic recording film and has a transparent conductive film on the inorganic recording film. The inorganic recording film has a first recording film containing titanium (Ti) and a second recording film containing an oxide of germanium (Ge). The transparent conductive film is provided on the side of the second recording film. The transparent conductive film contains an oxide of tin (Sn).Type: ApplicationFiled: March 21, 2008Publication date: February 25, 2010Applicant: SONY CORPORATIONInventors: Takemitsu Sakai, Etsuro Ikeda, Yuichi Sabi
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Publication number: 20090130461Abstract: To obtain high durability even when a recording material which causes big cubical expansion is used for a recording film of an information recording medium. An information recording medium 10 comprises a substrate, a recording film provided on the substrate, and a dielectric film provided on the substrate. The recording film is made of recording material configured to cause cubical expansion by light energy irradiation. The dielectric film is made of ZrO2 and Cr2O3. This prevents the generation of cracks in the dielectric film 4 and the immersion of moisture to the recording film 6 even when the recording material causes cubical expansion due to light energy irradiation.Type: ApplicationFiled: January 11, 2007Publication date: May 21, 2009Applicant: SONY CORPORATIONInventors: Yuichi Sabi, Etsuro Ikeda
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Publication number: 20090097387Abstract: To accomplish write-once type optical recording mediums that have excellent recording and reproducing characteristics and producibility and that are capable of being fabricated at low cost. A write-once type optical recording medium 10 has the structure of which an inorganic recording film 6, a dielectric film 4, and a light transmission layer 5 have been successively formed on a substrate 1. The inorganic recording film 6 is composed of a metal film 2 and an oxide film 3 successively formed on the substrate 1. When light is radiated to the inorganic recording film 6, oxygen is separated from the oxide film 3 due to the light catalyst effect, resulting in increasing the oxygen concentration on the metal film 2 side and largely varying the optical constant.Type: ApplicationFiled: November 16, 2006Publication date: April 16, 2009Applicant: SONY CORPORATIONInventors: Yuichi Sabi, Etsuro Ikeda, Fuminori Takase
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Patent number: 7468200Abstract: A write once optical recording medium has an inorganic recording film which includes an oxide film having germanium oxide (GeO) as a principal component, and a metal film adjacent to the oxide film, the metal film having a titanium/silicon alloy (TiSi) as a principal component. According to this arrangement, it is possible to construct an inexpensive write once optical recording medium with large strength capable of high density recording by using a short wavelength light source and an optical system with a high numerical aperture having excellent characteristics.Type: GrantFiled: March 10, 2006Date of Patent: December 23, 2008Assignee: Sony CorporationInventors: Yuichi Sabi, Etsuro Ikeda, Mitsuaki Oyamada
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Publication number: 20080233389Abstract: An optical recording medium having an inorganic recording film, wherein the inorganic recording film has: a first recording film containing titanium Ti; and a second recording film containing oxides of germanium Ge and tin Sn.Type: ApplicationFiled: March 17, 2008Publication date: September 25, 2008Applicant: SONY CORPORATIONInventors: Takemitsu Sakai, Yuichi Sabi, Etsuro Ikeda
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Publication number: 20060246249Abstract: A write once optical recording medium has an inorganic recording film which includes an oxide film having germanium oxide (GeO) as a principal component, and a metal film adjacent to the oxide film, the metal film having a titanium/silicon alloy (TiSi) as a principal component. According to this arrangement, it is possible to construct an inexpensive write once optical recording medium with large strength capable of high density recording by using a short wavelength light source and an optical system with a high numerical aperture having excellent characteristics.Type: ApplicationFiled: March 10, 2006Publication date: November 2, 2006Applicant: Sony CorporationInventors: Yuichi Sabi, Etsuro Ikeda, Mitsuaki Oyamada
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Publication number: 20050129899Abstract: In an optical recording medium 1 having a configuration in which on one main surface of a substrate 2, a reflective layer 3, a lower dielectrics layer 4, a recording layer 5, an upper dielectrics layer 6 and a light transmissive layer 7 are sequentially laminated, the lower dielectrics layer 4 is formed of a first lower dielectrics layer and a second lower dielectrics layer that inhibits a material that constitutes the first lower dielectrics layer and a material that constitutes the reflective layer 3 from reacting, and the upper dielectrics layer 6 is formed of a first upper dielectrics layer and a second upper dielectrics layer that inhibits a material that constitutes the first upper dielectrics layer and a material that constitutes the light transmissive layer 7 from reacting.Type: ApplicationFiled: January 22, 2004Publication date: June 16, 2005Inventors: Toru Abiko, Etsuro Ikeda, Nobuaki Furuichi, Fuminori Takase
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Patent number: 6654337Abstract: A recording medium and a recoding medium master, and a method of manufacturing the recording medium which comply with the standard of recording/reproducing characteristic established in the MD standard while enabling precise discrimination of the pit track and groove track and optical detection of the pits by optical pickup and the like are provided. Pits and grooves are arranged on a surface of a disc-shaped substrate so as to form a grooves and the ratio is from 1.00 exclusive to 1.13 inclusive. It is preferable that the track pitch of the grooves is from 1.50 &mgr;m inclusive to 1.70 &mgr;m exclusive. The width of the pits and grooves in the radial direction of the substrate is the same.Type: GrantFiled: August 7, 2001Date of Patent: November 25, 2003Assignee: Sony CorporationInventors: Sohmei Endoh, Manabu Satoh, Mitsuo Arima, Jun Shimizu, Etsuro Ikeda, Hirotaka Ozawa, Akitoshi Suzuki, Masayuki Takakuwa
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Publication number: 20020024924Abstract: A recording medium and a recoding medium master, and a method of manufacturing the recording medium which comply with the standard of recording/reproducing characteristic established in the MD standard while enabling precise discrimination of the pit track and groove track and optical detection of the pits by optical pickup and the like are provided. Pits and grooves are arranged on a surface of a disc-shaped substrate so as to form a grooves and the ratio is from 1.00 exclusive to 1.13 inclusive. It is preferable that the track pitch of the grooves is from 1.50 &mgr;m inclusive to 1.70 &mgr;m exclusive. The width of the pits and grooves in the radial direction of the substrate is the same.Type: ApplicationFiled: August 7, 2001Publication date: February 28, 2002Applicant: SONY CORPORATIONInventors: Sohmei Endoh, Manabu Satoh, Mitsuo Arima, Jun Shimizu, Etsuro Ikeda, Hirotaka Ozawa, Akitoshi Suzuki, Masayuki Takakuwa
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Patent number: 6319623Abstract: A magneto-optical recording medium is disclosed with which magneto-optical recording is performed by a magnetic-field modulation method and which enables stable recording characteristics to be realized even if the intensity of the recording magnetic field is somewhat changed. When a magneto-optical recording medium incorporating a signal recording layer made of TbFeCoCr and arranged such that a magneto-optical recording operation is performed with respect to the signal recording layer by the magnetic-field modulation method is manufactured, the signal recording layer is formed such that the total quantity of Tb and Cr contained in the signal recording layer is 24±1 at %. After the signal recording layer has been formed, exposure to stem by 30×10−6 Torr·sec to 10000×10−6 Torr·sec or exposure to oxygen by 10×10−6 Torr·sec to 50×10−6 Torr·sec is performed to oxidize the surface of the signal recording layer.Type: GrantFiled: February 4, 2000Date of Patent: November 20, 2001Assignee: Sony CorporationInventors: Etsuro Ikeda, Hiroshi Miura
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Patent number: 6048597Abstract: An optical disc in which a desired exchange reciprocal action is displayed between two sorts of the rare earth-transition metal alloy films to realize optimum recording/reproducing characteristics, and a manufacturing method for the optical disc. To this end, an optical disc 1 includes a first rare earth-transition metal alloy film containing rare earth elements and transition elements and a second rare earth-transition metal alloy film layered on the first rare earth-transition metal alloy film. The second rare earth-transition metal alloy film has a composition different from that of the first rare earth-transition metal alloy film and contains rare earth elements and transition elements. An oxidized area defined between the first rare earth-transition metal alloy film and the second rare earth-transition metal alloy film has an oxygen content not higher than 2.5 atom % and a thickness not larger than 7 nm.Type: GrantFiled: October 13, 1998Date of Patent: April 11, 2000Assignee: Sony CorporationInventors: Hiroshi Nakayama, Etsuro Ikeda
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Patent number: 6022462Abstract: A DC sputtering system improved in prevention of fusion of a substrate and electric corrosion of a pallet revolving shaft due to the flow of negative electric charges at the time of production of an optical disk. The system includes a pair of electrodes, a negative electrode and a positive electrode, wherein the negative electrode is composed of a target plate made from a target material such as Si and a backing plate on which the target plate is fixedly placed, and the positive electrode is composed of a pallet disposed opposite to the negative electrode. A substrate of an optical disk is mounted on the positive electrode side through a disk base using an inner peripheral mask and an outer peripheral mask. Each of the inner peripheral mask and the outer peripheral mask is made from or covered with an electrically insulating material such as teflon or ceramic.Type: GrantFiled: June 26, 1997Date of Patent: February 8, 2000Assignee: Sony CorporationInventors: Etsuro Ikeda, Itaru Suzuki, Yuji Kawana
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Patent number: 5745443Abstract: A magneto-optic disc comprised of a substrate on which are formed a recording layer and a protective film and on which information is recorded by a magnetic head floating above the magneto-optic disc by a predetermined floating distance at least at the time of recording the information, wherein the height of the projections on the surface of the protective film of the magneto-optic disc is smaller than the floating distance of the magnetic head.Type: GrantFiled: June 19, 1996Date of Patent: April 28, 1998Assignee: Sony CorporationInventors: Mikio Yoshida, Etsuro Ikeda
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Patent number: 5741541Abstract: In a magneto-optical recording medium having a substrate, a recording layer having at least a rare earth-transition metal alloy film formed on the substrate, and a dielectric layer formed on the recording layer, a depth of penetration in the recording layer for an element derived from the dielectric layer is set to 70 .ANG. or less from an interface between the recording layer and the dielectric layer in a depth-directional film structure analysis by an Auger electron spectroscopy. Accordingly, mixing of impurities into the recording layer can be suppressed to thereby lower the value of the required recording magnetic field.Type: GrantFiled: November 15, 1996Date of Patent: April 21, 1998Assignee: Sony CorporationInventors: Etsuro Ikeda, Masahiro Kikkawa, Takashi Kishi
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Patent number: 5585197Abstract: In a magneto-optical recording medium having a substrate, a recording layer having at least a rare earth-transition metal alloy film formed on the substrate, and a dielectric layer formed on the recording layer, a depth of penetration in the recording layer for an element derived from the dielectric layer is set to 70.ANG. or less from an interface between the recording layer and the dielectric layer in a depth-directional film structure analysis by an Auger electron spectroscopy. Accordingly, mixing of impurities into the recording layer can be suppressed to thereby lower the value of the required recording magnetic field.Type: GrantFiled: August 11, 1994Date of Patent: December 17, 1996Assignee: Sony CorporationInventors: Etsuro Ikeda, Masahiro Kikkawa, Takashi Kishi