Patents by Inventor Tatsuo Ohta
Tatsuo Ohta 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: 7803455Abstract: The present invention provides an optical element including: a substrate; and an antireflection film formed on a surface of the substrate. The antireflection film includes a plurality of lower refractive index layers, and a plurality of higher refractive index layers which are layered alternately. Each of at least two of the plurality of lower refractive index layers comprises a same main component each other and comprises a side component with a different content ratio independently.Type: GrantFiled: July 31, 2006Date of Patent: September 28, 2010Assignee: Konica Minolta Opto, Inc.Inventors: Kunihiko Taka, Tatsuo Ohta, Katsuya Nakamura
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Patent number: 7715302Abstract: An optical element for use in an optical pickup apparatus includes a substrate made of resin; an antireflection layer coating the substrate and having a low refractive index layer and a high refractive index layer, wherein the resin includes a polymer with an alicyclic structure, the low refractive index layer is formed of a material selected from the group consisting of silicon oxide; aluminum fluoride; yttrium fluoride; magnesium fluoride; a mixture of silicon oxide and aluminum oxide; and a mixture thereof, the high refractive index layer is formed of a material selected from the group consisting of scandium oxide; niobium oxide; lanthanum oxide; praseodymium titanate; lanthanum titanate; lanthanum aluminate; yttrium oxide; hafnium oxide; zirconium oxide; tantalum oxide; a mixture of tantalum oxide and titanium; silicon nitride; and a mixture thereof.Type: GrantFiled: February 11, 2005Date of Patent: May 11, 2010Assignee: Konica Minolta Opto, Inc.Inventors: Tatsuo Ohta, Takashi Nozaki, Yayoi Eguro, Takeshi Kojima
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Patent number: 7682676Abstract: An optical element irradiated with a light flux having a wavelength of 350 nm to 450 nm, is provided with a synthetic resin base material; and an antireflection film provided on the synthetic resin base material and including a contact layer being in contact with the synthetic resin base material, wherein the contact layer is a film made of a material containing no oxygen atom or a film made of a mixed material or a material containing no oxygen atom and a material containing an oxygen atom in which the mixed material contains the material containing an oxygen atom less than 10%.Type: GrantFiled: February 4, 2005Date of Patent: March 23, 2010Assignee: Konica Minolta Opto, Inc.Inventors: Setsuo Tokuhiro, Tatsuo Ohta
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Patent number: 7602679Abstract: An optical lens to be arranged in an optical information recording and/or reproducing apparatus includes at least one lens main body; an antireflective film arranged on a first lens surface which has the largest surface angle on an outer peripheral portion in an effective radius of lens surfaces on the lens main body; wherein for a light entering perpendicularly to a central portion of the first lens surface whose central portion has a surface angle of 0 degree, a spectral reflectance of the antireflective film has one or more regions in which the spectral reflectance is continuously 4% or below and the wavelength includes at least a part of a wavelength region of 300 to 1000 nm, the broadest wavelength region of the one or more wavelength regions extends from wavelength ?1 to wavelength ?2 and the wavelength ?1 is in a range of 348-460 nm.Type: GrantFiled: July 7, 2004Date of Patent: October 13, 2009Assignee: Konica Minolta Opto, Inc.Inventors: Tatsuo Ohta, Kunihiko Taka
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Patent number: 7599119Abstract: An antireflection coating provided on an optical element which passes through at least two wavelengths of light in the wavelength range of 1300-1600 nm, wherein the antireflection coating comprises: a high refractive index layer; a low refractive index layer having a refractive index lower than a refractive index of the high refractive index layer; and a supplementary layer having a composition different from a composition of the high refractive index layer or from a composition of the low refractive index layer, and being provided adjacent to the high refractive index layer or to the low refractive index layer.Type: GrantFiled: January 13, 2006Date of Patent: October 6, 2009Assignee: Konica Minolta Opto, Inc.Inventors: Katsuya Nakamura, Tatsuo Ohta, Setsuo Tokuhiro, Kunihiko Taka, Shingo Nakamura
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Patent number: 7554736Abstract: An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.Type: GrantFiled: March 30, 2005Date of Patent: June 30, 2009Assignee: Konica Minolta Opto, Inc.Inventors: Tatsuo Ohta, Takashi Nozaki
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Publication number: 20070035840Abstract: The present invention provides an optical element including: a substrate; and an antireflection film formed on a surface of the substrate. The antireflection film includes a plurality of lower refractive index layers, and a plurality of higher refractive index layers which are layered alternately. Each of at least two of the plurality of lower refractive index layers comprises a same main component each other and comprises a side component with a different content ratio independently.Type: ApplicationFiled: July 31, 2006Publication date: February 15, 2007Inventors: Kunihiko Taka, Tatsuo Ohta, Katsuya Nakamura
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Patent number: 7161744Abstract: An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; a first film having a refractive index of less than 1.7 for light having a wavelength of 405 nm; a second film having a refractive index of 1.7 or more for the light having the wavelength of 405 nm; and a third film having a refractive index of 1.55 or less for the light having the wavelength of 405 nm, wherein: the first film, the second film and the third film are provided on the lens body; the first film is provided between the lens body and the second film; the second film is provided between the first film and the third film; and a thickness of the first film is in a range of 50 to 15000 nm.Type: GrantFiled: April 4, 2005Date of Patent: January 9, 2007Assignee: Konica Minolta Opto, Inc.Inventors: Tatsuo Ohta, Takashi Nozaki
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Patent number: 7085219Abstract: An optical lens for condensing a light emitted from a laser light source on an optical recording medium, the light having a wavelength ?1 within a wavelength range from 400 nm to 440 nm, comprises: a light incident side lens surface disposed on a side which the light emitted from the laser light source enters, the light incident side lens surface comprising a peripheral part having an angle ? of 45 degrees or more, where the ? is an angle formed by a normal line at a position on each lens surface and an optical axis; and a first anti-reflection film formed on the light incident side lens surface, the first anti-reflection film having a film thickness which is set so that a wavelength ?2 at which a reflectance of the light entering a central part having the angle ? of zero degrees, of the light incident side lens surface at an angle of zero degrees has a local minimum value, satisfies ?1<?2 and 420 nm??2?680 nm.Type: GrantFiled: June 18, 2003Date of Patent: August 1, 2006Assignee: Konica Opto CorporationInventor: Tatsuo Ohta
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Publication number: 20060158738Abstract: An antireflection coating provided on an optical element which passes through at least two wavelengths of light in the wavelength range of 1300-1600 nm, wherein the antireflection coating comprises: a high refractive index layer; a low refractive index layer having a refractive index lower than a refractive index of the high refractive index layer; and a supplementary layer having a composition different from a composition of the high refractive index layer or from a composition of the low refractive index layer, and being provided adjacent to the high refractive index layer or to the low refractive index layer.Type: ApplicationFiled: January 13, 2006Publication date: July 20, 2006Inventors: Katsuya Nakamura, Tatsuo Ohta, Setsuo Tokuhiro, Kunihiko Taka, Shingo Nakamura
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Patent number: 7079323Abstract: A surface treating method of forming a coating layer on a base material, comprising conducting a plasma processing under an atmospheric pressure for the base material so as to form a coating layer on the base material having at least one of a curved surface and an uneven surface.Type: GrantFiled: June 9, 2003Date of Patent: July 18, 2006Assignee: Konica CorporationInventors: Tatsuo Ohta, Satoshi Nakano, Hiroshi Hirayama
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Publication number: 20050248864Abstract: An optical element irradiated with a light flux having a wavelength of 350 nm to 450 nm, is provided with a synthetic resin base material; and an antireflection film provided on the synthetic resin base material and including a contact layer being in contact with the synthetic resin base material, wherein the contact layer is a film made of a material containing no oxygen atom or a film made of a mixed material or a material containing no oxygen atom and a material containing an oxygen atom in which the mixed material contains the material containing an oxygen atom less than 10%.Type: ApplicationFiled: February 4, 2005Publication date: November 10, 2005Inventors: Setsuo Tokuhiro, Tatsuo Ohta
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Publication number: 20050225879Abstract: An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; a first film having a refractive index of less than 1.7 for light having a wavelength of 405 nm; a second film having a refractive index of 1.7 or more for the light having the wavelength of 405 nm; and a third film having a refractive index of 1.55 or less for the light having the wavelength of 405 nm, wherein: the first film, the second film and the third film are provided on the lens body; the first film is provided between the lens body and the second film; the second film is provided between the first film and the third film; and a thickness of the first film is in a range of 50 to 15000 nm.Type: ApplicationFiled: April 4, 2005Publication date: October 13, 2005Inventors: Tatsuo Ohta, Takashi Nozaki
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Publication number: 20050219683Abstract: An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens containing a lens body made of a polymer resin having an alicyclic structure; and an antireflection film including one or more layers provided on a surface of the lens body facing to the optical information recording medium, wherein a refractive index of the antireflection film for a light flux having a wavelength of 405 nm is less than 1.7.Type: ApplicationFiled: March 30, 2005Publication date: October 6, 2005Inventors: Tatsuo Ohta, Takashi Nozaki
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Publication number: 20050201422Abstract: An optical element for use in an optical pickup apparatus includes a substrate made of resin; an antireflection layer coating the substrate and having a low refractive index layer and a high refractive index layer, wherein the resin includes a polymer with an alicyclic structure, the low refractive index layer is formed of a material selected from the group consisting of silicon oxide; aluminum fluoride; yttrium fluoride; magnesium fluoride; a mixture of silicon oxide and aluminum oxide; and a mixture thereof, the high refractive index layer is formed of a material selected from the group consisting of scandium oxide; niobium oxide; lanthanum oxide; praseodymium titanate; lanthanum titanate; lanthanum aluminate; yttrium oxide; hafnium oxide; zirconium oxide; tantalum oxide; a mixture of tantalum oxide and titanium; silicon nitride; and a mixture thereof.Type: ApplicationFiled: February 11, 2005Publication date: September 15, 2005Inventors: Tatsuo Ohta, Takashi Nozaki, Yayoi Eguro, Takeshi Kojima
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Patent number: 6903512Abstract: A method of producing a half mirror film on a substrate having a light transmissive property, comprising steps of: electrically discharging between electrodes facing each other under an atmospheric pressure or an approximate atmospheric pressure so as to make an reactive gas on a plasma state; and exposing a substrate to the reactive gas on the plasma state so as to form a half mirror film on the substrate.Type: GrantFiled: July 29, 2002Date of Patent: June 7, 2005Assignee: Konica CorporationInventors: Tatsuo Ohta, Satoshi Nakano, Yumi Muramatsu
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Publication number: 20050109616Abstract: A sputtering apparatus for applying a thin film coating to a substrate containing, in a vacuum chamber, at least two cylindrical targets and at least two magnets each juxtaposed to one of the targets so as to generate a magnetic field in a vicinity of an outer surface of the target, wherein, the following relationship is satisfied d1?3d2, provided that d1 is a distance between the outer surfaces of the two targets and d2 is any one of distances between the outer surfaces of the targets and the substrate.Type: ApplicationFiled: October 25, 2004Publication date: May 26, 2005Inventors: Tatsuo Ohta, Satoshi Nakano, Setsuo Tokuhiro
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Publication number: 20050068456Abstract: An image pickup device includes: an image pickup lens; an image sensor mounted on a substrate; and a holding member having an infrared cut-off filter thereon, the infrared cut-off filter is formed by laminating a plurality of films in order to cut off an infrared wavelength range of an incident light, wherein the holding member is arranged between the image pickup lens and the image sensor.Type: ApplicationFiled: September 8, 2004Publication date: March 31, 2005Applicant: Konica Minolta Opto, Inc.Inventors: Tatsuo Ohta, Satoshi Nakano, Susumu Yamaguchi
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Publication number: 20050018297Abstract: This invention provides an optical component which can keep the light transmittance high while ensuring good wiping resistance characteristics, and can also realize intended optical characteristics based on a fine structure, and an optical pickup apparatus including the optical component. An optical component according to this invention includes a first optical surface on which a fine structure is formed and a second optical surface on which no fine structure is formed. The number of layers of an antireflection film on the first optical surface is set to be smaller than the number of layers of an antireflection film on the second optical surface.Type: ApplicationFiled: July 9, 2004Publication date: January 27, 2005Inventors: Tatsuo Ohta, Norikazu Arai, Shin-ichiro Saito
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Publication number: 20040233823Abstract: An optical lens for condensing a light emitted from a laser light source on an optical recording medium, the light having a wavelength &lgr;1 within a wavelength range from 400 nm to 440 nm, comprises: a light incident side lens surface disposed on a side which the light emitted from the laser light source enters, the light incident side lens surface comprising a peripheral part having an angle &thgr; of 45 degrees or more, where the &thgr; is an angle formed by a normal line at a position on each lens surface and an optical axis; and a first anti-reflection film formed on the light incident side lens surface, the first anti-reflection film having a film thickness which is set so that a wavelength &lgr;2 at which a reflectance of the light entering a central part having the angle &thgr; of zero degrees, of the light incident side lens surface at an angle of zero degrees has a local minimum value, satisfies &lgr;1<&lgr;2 and 420 nm≦&lgr;2≦680 nm.Type: ApplicationFiled: June 18, 2003Publication date: November 25, 2004Applicant: Konica Opto CorporationInventor: Tatsuo Ohta