Patents by Inventor Toshihiko Baba
Toshihiko Baba 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: 7525726Abstract: To provide a photonic crystal semiconductor device which enables various kinds of optical devices having a photonic crystal structure which is readily formed using a semiconductor and a semiconductor manufacturing process, and a manufacturing method thereof. The object can be achieved by a photonic crystal structure, including a lower DBR layer 1, a core layer 2, an upper DBR layer 3, and a dielectric multilayer film 6 which are sequentially laminated from an n-InP substrate 11 side, a plurality of holes 9 formed in the direction of a film thickness in the core layer 2 and the upper DBR layer 3, and a line defect portion 10 with none of the plurality of holes formed therein and disposed between the plurality of holes 9, wherein the line defect portion 10 serves as an optical waveguide.Type: GrantFiled: August 17, 2006Date of Patent: April 28, 2009Assignees: The Furukawa Electric Co., Ltd., Toshihiko BABAInventors: Tomofumi Kise, Tatsuya Kimoto, Noriyuki Yokouchi, Toshihiko Baba
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Patent number: 7489717Abstract: A surface-emitting semiconductor laser (VCSEL) having a structure in which the single horizontal mode of high power is stably maintained, and an optical device including a light-source device having this surface-emitting semiconductor laser are provided. A scattering-loss-structure portion composed of a low refractive-index region is disposed around a main current path in a surface-emitting semiconductor laser, namely around a cavity structure portion; the low refractive-index region is disposed at intervals; and the shape of the tip portion opposing to the center portion is set to be a tapered shape, for example, at an acute angle. Accordingly, in the cavity structure portion, the loss of light-emitting laser of a high-order mode localized in the outer circumferential portion becomes large, so that a surface-emitting semiconductor laser that oscillates the single-mode laser with favorable performance is constructed.Type: GrantFiled: October 28, 2004Date of Patent: February 10, 2009Assignees: Sony Corporation, Toshihiko BabaInventors: Toshihiko Baba, Atsushi Matsuzono, Akio Furukawa, Satoshi Sasaki, Mitsunari Hoshi
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Publication number: 20080273832Abstract: An active area includes a photonic-crystal optical waveguide formed by periodically arranging a plurality of holes in a primary plane direction of an active-area core layer in an active-area growth portion. A passive area includes a passive optical waveguide formed in a passive-area growth portion. An effective refractive index of a growth structure of the active-area growth portion is larger than an effective refractive index of a growth structure of the passive-area growth portion, and an active layer has a gain at a zero group-velocity point positioned on a high-frequency side of a dispersion curve of the photonic-crystal optical waveguide.Type: ApplicationFiled: July 10, 2008Publication date: November 6, 2008Applicants: THE FURUKAWA ELECTRIC CO., LTD, National University CorporationInventors: Kazuaki Kiyota, Toshihiko Baba
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Patent number: 7433641Abstract: A fixing member heat bonds a toner on a recording material. The fixing member includes a releasing layer, a layer of elastic material, below the releasing layer, and a layer of adiabatic and hygroscopic material, below the layer of elastic material. The layer of elastic material includes a layer of electrically conducting material to pass electric currents, an adiabatic, elastic, and hydrophobic material, and a porous material to the release of the moisture absorbed by the layer of adiabatic and hygroscopic material.Type: GrantFiled: August 9, 2005Date of Patent: October 7, 2008Assignee: Ricoh Company, LimitedInventors: Hisashi Kikuchi, Toshihiko Baba, Shigeo Kurotaka, Atsushi Nakafuji, Hiroyuki Kunii, Yukimichi Someya, Katsuhiro Echigo, Takashi Fujita
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Publication number: 20080173887Abstract: A self-luminous device 1 is one embodiment which has an increased light extraction efficiency by optimizing the distribution of refractive index in semiconductor layers. The self-luminous device 1 includes a first layer (semiconductor layer 2), a light emitting layer 3 overlaying the first layer (semiconductor layer 2), and a second layer (semiconductor layer 4) overlaying the light emitting layer 3. The first layer (semiconductor layer 2) and the second layer (semiconductor layer 4) have different refractive indices so that the refractive indices of the two layers (semiconductor layers 2 and 4) are asymmetric with respect to the light emitting layer interposed therebetween. In the refractive index distribution of asymmetric layers (semiconductor layers), the refractive index of the second layer (semiconductor layer 4) is higher than that of the first layer (semiconductor layer 2).Type: ApplicationFiled: September 28, 2007Publication date: July 24, 2008Applicant: Stanley Electric Co., Ltd.Inventors: Toshihiko Baba, Kosuke Morito
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Publication number: 20080149916Abstract: A light emitting device with an increased light extraction efficiency includes a two-dimensional periodic structure in a surface thereof and has two layers that together form an asymmetric refractive index distribution with respect to the active layer, which is in between the two layers. The light emitting device includes a substrate layer, a first layer, an active layer and a second layer that are stacked sequentially. The first layer includes at least one layer, including a semiconductor cladding layer of a first conductivity type. At least one layer of the first layer has a refractive index that is lower than a refractive index of the active layer and lower than a refractive index of a layer of the second layer that is adjacent to the active layer. Each constituent layer of the second layer has a refractive index that is lower than the refractive index of the active layer.Type: ApplicationFiled: September 26, 2007Publication date: June 26, 2008Applicant: Stanley Electric Co., Ltd.Inventors: Toshihiko Baba, Takuya Kazama, Junichi Sonoda
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Publication number: 20080138124Abstract: A fixing apparatus includes a fixing member to be heated and a pressure-contacting member for pressure contacting the fixing member. The fixing apparatus directs and conveys a recording member through a nip formed between the fixing member and pressure applying member in such a manner that a toner image carried on a recording member contacts the fixing member in order to be fixed thereto with heat and pressure. The fixing apparatus is configured to direct a tip margin of the recording member toward the pressure applying member across a virtual linear extension line drawn from a downstream end to upstream end of the nip when only the tip margin exits from the nip. A fixing member side separation device may be separately provided from the surface of the fixing apparatus so as to separate the recording member exiting from the nip. A gap formed between the downstream end of the nip and the tip of the fixing member side separation device is set smaller than the width of the tip margin.Type: ApplicationFiled: February 5, 2008Publication date: June 12, 2008Inventors: Hisashi Kikuchi, Shigeo Kurotaka, Kiyoshi Ohshima, Takashi Fujita, Toshihiko Baba, Atsushi Nakafuji, Hirokazu Ikenoue, Jun Yura, Echigo Katsuhiro, Hideki Kosugi
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Patent number: 7369734Abstract: An optical control device includes a photonic crystal and a line-defect waveguide formed in the photonic crystal wherein the optical control device is capable of guiding, through the line-defect waveguide, a light having a wavenumber larger than a wavenumber corresponding to an anti-intersection of an even-mode band and an odd-mode band, the even-mode band and odd-mode band being a waveguide band of the line-defect waveguide, wherein the even-mode band of the line-defect waveguide includes two or more inflection points in a wavenumber region larger than a wavenumber corresponding to an intersection of the even-mode band and said odd-mode band, the optical control device guiding a light having a frequency in the vicinity of the inflection point.Type: GrantFiled: March 19, 2007Date of Patent: May 6, 2008Assignees: Ricoh Company, Ltd., National University Corporation Yokohama National UniversityInventors: Atsushi Sakai, Ikuo Katoh, Toshihiko Baba
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Patent number: 7369803Abstract: A fixing device for fixing image information on a recording medium passing a nip of the present invention includes a rotatable member for transferring and conveying a non-fixed image, a first heating means for heating an image present on the rotatable member and a rotatable pressing member forming a nip in combination with the rotatable member. A heat pipe extends in parallel to the axis of the rotatable member. A radiating member is positioned at one end of the heat pipe while a heating member is positioned at the other end of the heat pipe.Type: GrantFiled: December 1, 2005Date of Patent: May 6, 2008Assignee: Ricoh Company, Ltd.Inventors: Katsuhiro Echigo, Takashi Fujita, Shigeo Kurotaka, Hisashi Kikuchi, Yukimichi Someya, Toshihiko Baba, Hiroyuki Kunii, Atsushi Nakafuji, Kohji Ue
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Patent number: 7346305Abstract: A fixing apparatus includes a fixing member to be heated and a pressure-contacting member for pressure contacting the fixing member. The fixing apparatus directs and conveys a recording member through a nip formed between the fixing member and pressure applying member in such a manner that a toner image carried on a recording member contacts the fixing member in order to be fixed thereto with heat and pressure. The fixing apparatus is configured to direct a tip margin of the recording member toward the pressure applying member across a virtual linear extension line drawn from a downstream end to upstream end of the nip when only the tip margin exits from the nip. A fixing member side separation device may be separately provided from the surface of the fixing apparatus so as to separate the recording member exiting from the nip. A gap formed between the downstream end of the nip and the tip of the fixing member side separation device is set smaller than the width of the tip margin.Type: GrantFiled: November 7, 2006Date of Patent: March 18, 2008Assignee: Ricoh Company, LtdInventors: Hisashi Kikuchi, Shigeo Kurotaka, Kiyoshi Ohshima, Takashi Fujita, Toshihiko Baba, Atsushi Nakafuji, Hirokazu Ikenoue, Jun Yura, Katsuhiro Echigo, Hideki Kosugi
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Patent number: 7333760Abstract: A fixing device including a magnetic field generating device to generate a magnetic field, a fixing member to heat a recording material by heat generated in a first recording material passing area having a first width on the fixing member by electromagnetic induction heat generation by the magnetic field formed by the magnetic field generating device, a pressing member to form a nip portion where the pressing member and the fixing member press against each other to fix an unfixed image on the recording material, and at least one radiation heating device configured to heat a second recording material passing area having a second width.Type: GrantFiled: June 24, 2005Date of Patent: February 19, 2008Assignee: Ricoh Company, Ltd.Inventors: Toshihiko Baba, Shigeo Kurotaka, Katsuhiro Echigo, Takashi Fujita, Hisashi Kikuchi, Yukimichi Someya, Hiroyuki Kunii, Atsushi Nakafuji, Kohji Ue
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Patent number: 7299003Abstract: A fixing belt is heated by electromagnetic induction. The fixing belt has a heat generating layer that has a thickness not greater than 40 ?m and a releasing layer that has a thickness not less than 10 ?m. A toner that includes at least a binder resin, a colorant, and a mold releasing agent, and has a glass transition temperature in a range of 35° C. to 50° C. and an outflow-start temperature in a range of 80° C. to 110° C., is used.Type: GrantFiled: January 28, 2005Date of Patent: November 20, 2007Assignee: Ricoh Company, LimitedInventors: Shigeo Kurotaka, Masami Tomita, Katsuhiro Echigo, Takashi Fujita, Toshihiko Baba, Hisashi Kikuchi, Hiroyuki Kunii, Atsushi Nakafuji, Yukimichi Someya, Kohji Ue
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Patent number: 7269384Abstract: A transfer-fixing unit for use in an image forming apparatus having an intermediate transfer member and a transfer-fixing unit, which includes a pressure member and a transfer-fixing member. The intermediate transfer member receives a toner image thereon. The transfer-fixing member has a deformable surface layer thereon, and directly receives the toner image from the intermediate transfer member, and transfers and fixes the toner image to a recording medium while deforming the surface layer in response to surface irregularities of the recording medium. The transfer-fixing member forms a nip portion with the pressure member and presses the recording medium at the nip portion when the recording medium passes through the nip portion with a nip time.Type: GrantFiled: July 11, 2005Date of Patent: September 11, 2007Assignee: Ricoh Company, Ltd.Inventors: Yukimichi Someya, Takashi Fujita, Atsushi Nakafuji, Katsuhiro Echigo, Hiroyuki Kunii, Shigeo Kurotaka, Hisashi Kikuchi, Toshihiko Baba, Kohji Ue, Hiromitsu Takagaki, Hirohmi Tamura
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Publication number: 20070202622Abstract: A method for manufacturing a surface-emitting semiconductor laser having a structure in which the single horizontal mode of high power is stably maintained is provided. A scattering-loss-structure portion composed of a low refractive-index region is disposed around a main current path in a surface-emitting semiconductor laser, namely around a cavity structure portion; the low refractive-index region is disposed at intervals; and the shape of the tip portion opposing to the center portion is set to be a tapered shape, for example, at an acute angle. Accordingly, in the cavity structure portion, the loss of light-emitting laser of a high-order mode localized in the outer circumferential portion becomes large, so that a surface-emitting semiconductor laser that oscillates the single-mode laser with favorable performance is constructed.Type: ApplicationFiled: November 3, 2006Publication date: August 30, 2007Applicants: Sony CorporationInventors: Toshihiko Baba, Atsushi Matsuzono, Akio Furukawa, Satoshi Sasaki, Mitsunari Hoshi
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Patent number: 7251429Abstract: An image forming apparatus of the present invention includes a fixing device for fixing a toner image formed on a recording medium. A heat source is applied with power for generating heat to thereby heating the heating device. A drive circuit includes a storage capable of being selectively charged or discharged and a charger for charging the storage by being supplied with power from a commercial power supply. A discharging device discharges the storage in a non-use mode in which the apparatus is not used.Type: GrantFiled: May 22, 2006Date of Patent: July 31, 2007Assignee: Ricoh Company, Ltd.Inventors: Atsushi Nakafuji, Shigeo Kurotaka, Katsuhiro Echigo, Takashi Fujita, Hisashi Kikuchi, Jun Yura, Toshihiko Baba, Hirokazu Ikenoue
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Publication number: 20070160336Abstract: An optical control device includes a photonic crystal and a line-defect waveguide formed in the photonic crystal wherein the optical control device is capable of guiding, through the line-defect waveguide, a light having a wavenumber larger than a wavenumber corresponding to an anti-intersection of an even-mode band and an odd-mode band, the even-mode band and odd-mode band being a waveguide band of the line-defect waveguide, wherein the even-mode band of the line-defect waveguide includes two or more inflection points in a wavenumber region larger than a wavenumber corresponding to an intersection of the even-mode band and said odd-mode band, the optical control device guiding a light having a frequency in the vicinity of the inflection point.Type: ApplicationFiled: March 19, 2007Publication date: July 12, 2007Inventors: ATSUSHI SAKAI, Ikuo Katoh, Toshihiko Baba
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Patent number: 7242839Abstract: An optical delay element including a photonic crystal line defect optical waveguide is disclosed that has a large group refractive index and has small or nearly constant wavelength dispersion of the group refractive index in a wide wavelength region for practical use. The optical delay element includes a line defect optical waveguide formed in a photonic crystal structure, and the volume of the line defect optical waveguide is less than the volume of a single line defect optical waveguide. Thereby, the waveguide band of the line defect optical waveguide has two zero points in the third order dispersion curve of the line defect optical waveguide, and the sign of the third order dispersion curve is inverted near the zero points.Type: GrantFiled: March 23, 2005Date of Patent: July 10, 2007Assignees: Ricoh Company, Ltd., Toshihiko BabaInventors: Atsushi Sakai, Ikuo Katoh, Hiroyoshi Funato, Toshihiko Baba
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Patent number: 7233762Abstract: An unfixed toner image on a transferring and fixing belt is passed through a pair of toner integrating rollers. A surface side of the toner integrated that is in contact with a paper, is heated by a halogen heater to impart a tackiness required for fixing. As a result of this, a temperature of a surface side of the toner that is in contact with the transferring and fixing belt is not as high as a temperature of the surface side of the toner that is in contact with the paper. Therefore, even if the toner is pressurized, and transferred and fixed at a fixing nip, a difference in an area of the toner is small. This enables to achieve a good image quality.Type: GrantFiled: March 18, 2005Date of Patent: June 19, 2007Assignee: Ricoh Company, Ltd.Inventors: Hiroyuki Kunii, Katsuhiro Echigo, Hisashi Kikuchi, Atsushi Nakafuji, Yukimichi Someya, Shigeo Kurotaka, Toshihiko Baba, Kohji Ue, Takashi Fujita
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Patent number: 7224928Abstract: A fixing apparatus includes a fixing member to be heated and a pressure-contacting member for pressure contacting the fixing member. The fixing apparatus directs and conveys a recording member through a nip formed between the fixing member and pressure applying member in such a manner that a toner image carried on a recording member contacts the fixing member in order to be fixed thereto with heat and pressure. The fixing apparatus is configured to direct a tip margin of the recording member toward the pressure applying member across a virtual linear extension line drawn from a downstream end to upstream end of the nip when only the tip margin exits from the nip. A fixing member side separation device may be separately provided from the surface of the fixing apparatus so as to separate the recording member exiting from the nip. A gap formed between the downstream end of the nip and the tip of the fixing member side separation device is set smaller than the width of the tip margin.Type: GrantFiled: July 29, 2004Date of Patent: May 29, 2007Assignee: Ricoh Company, Ltd.Inventors: Hisashi Kikuchi, Shigeo Kurotaka, Kiyoshi Ohshima, Takashi Fujita, Toshihiko Baba, Atsushi Nakafuji, Hirokazu Ikenoue, Jun Yura, Katsuhiro Echigo, Hideki Kosugi
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Publication number: 20070104520Abstract: An image forming apparatus, includes an image forming mechanism configured to form an image, and a fixing unit configured to fix a toner image formed on a recording medium. The fixing unit includes a fixing device having a first endless moving member configured to rotate, and a second endless moving member configured to rotate to form a nip area together with the first endless moving member to fix, at the nip area, a toner image disposed on the recording medium onto the recording medium with heat and pressure, the second endless moving member including a surface layer having a universal hardness HU and a maximum nip surface pressure P each within a predetermined range.Type: ApplicationFiled: December 28, 2006Publication date: May 10, 2007Inventors: Atsushi Nakafuji, Hiroyuki Kunii, Yukimichi Someya, Katsuhiro Echigo, Takashi Fujita, Hisashi Kikuchi, Toshihiko Baba, Shigeo Kurotaka