Patents by Inventor Shinya Sasaki
Shinya Sasaki 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).
-
Patent number: 6850663Abstract: A transponder which may form part of communication device such as an optical transmitters device includes an optical receiver for receiving a high speed optical information signal and for converting the high speed optical information signal to an electrical signal, a demultiplexing circuit for separating the electrical signal into a plurality of low speed information signals, a plurality of optical transmitters each of which converts one of the low speed electrical signals into an optical signal of mutually different wavelengths, and a propagation delay difference compensating circuit. The propagation delay difference compensating circuit is provided between the demultiplexing circuit and the plurality of optical transmitters and compensates mutual propagation delay differences of each of the optical signals outputted from the optical transmitters.Type: GrantFiled: March 7, 2003Date of Patent: February 1, 2005Assignee: Hitachi, Ltd.Inventors: Nobuhiko Kikuchi, Shinya Sasaki
-
Patent number: 6810160Abstract: An optical wiring substrate provides a slab optical waveguide having a refractive index different from a refractive index of other surrounding portions and a planar convex lens being provided continuously to a tip portion of an optical path of an optical wave guide including a core and cladding and formed on a substrate. The optical path of light passing through the planar convex lens is converted approximately by 90° with a mirror. The light reflected with the mirror is made as parallel light rays by use of a cylindrical lens.Type: GrantFiled: February 28, 2002Date of Patent: October 26, 2004Assignee: Fujitsu LimitedInventors: Akio Sugama, Masayuki Kato, Masatoshi Ishii, Shinya Sasaki, Tsuyoshi Aoki
-
Publication number: 20040161189Abstract: An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-toelectric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: ApplicationFiled: February 13, 2004Publication date: August 19, 2004Applicant: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano
-
Patent number: 6728489Abstract: An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: GrantFiled: July 19, 2001Date of Patent: April 27, 2004Assignee: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano
-
Patent number: 6700910Abstract: In order to form a wavelength tunable laser capable of tuning a wave over a wide range by simple control means, a thin film heater is mounted either over an upper electrode of a ridge waveguide semiconductor laser having ridge waveguides on a semiconductor substrate or over the semiconductor substrate and on both sides of the ridge waveguide with a gap of a few &mgr;m. By controlling a current passed to the thin film heater, the oscillation wavelength of the semiconductor laser is tuned. In the case where the thin film heater is mounted over an upper electrode of a ridge waveguide, a nonconductor is formed on both sides of the ridge conductor to more efficiently enable heat from the heater to reach an active layer of the ridge waveguide more efficiently.Type: GrantFiled: February 15, 2000Date of Patent: March 2, 2004Assignee: Hitachi, Ltd.Inventors: Masahiro Aoki, Shinya Sasaki, Tomonobu Tsuchiya, Hiroyuki Gomyo
-
Publication number: 20030147585Abstract: A transponder which may form part of communication device such as an optical transmitters device includes an optical receiver for receiving a high speed optical information signal and for converting the high speed optical information signal to an electrical signal, a demultiplexing circuit for separating the electrical signal into a plurality of low speed information signals, a plurality of optical transmitters each of which converts one of the low speed electrical signals into an optical signal of mutually different wavelengths, and a propagation delay difference compensating circuit. The propagation delay difference compensating circuit is provided between the demultiplexing circuit and the plurality of optical transmitters and compensates mutual propagation delay differences of each of the optical signals outputted from the optical transmitters.Type: ApplicationFiled: March 7, 2003Publication date: August 7, 2003Inventors: Nobuhiko Kikuchi, Shinya Sasaki
-
Patent number: 6532320Abstract: The technical problem disclosed concerns increase of transmission distance between inter-site transmission parts when a circuit speed is increased, and simplification of an intra-site circuit. The means to resolve the problem is as follows. An intra-site circuit connecting an intra-site information communications device 140-1 and a wavelength division multiplexing optical transmission device 147 is demultiplexed into plural low speed wavelength division multiplexing signals by a transponder 100 according to this invention, and transmitted to an inter-site optical fiber circuit 144. The signals are again multiplexed into a high-speed optical signal by a transponder 110 in a wavelength division multiplexing optical transmission device 148 on the receiving side, and transmitted to an intra-site optical fiber circuit 143-1.Type: GrantFiled: September 12, 2000Date of Patent: March 11, 2003Assignee: Hitachi, Ltd.Inventors: Nobuhiko Kikuchi, Shinya Sasaki
-
Publication number: 20030035632Abstract: A coupling structure is disclosed. An optical device includes a core layer for guiding a light beam exiting a core layer of an optical fiber. The core layer of the optical device avoids a power loss of a light beam and establishes an adiabatic coupling. The core layer of the optical device may have a tapered surface.Type: ApplicationFiled: April 15, 2002Publication date: February 20, 2003Inventors: Alexei Glebov, Shinya Sasaki, Michael Lee
-
Patent number: 6472639Abstract: Uniformity of temperature is established within a wafer, and a higher throughput is achieved while the wafer heating time is dramatically reduced by combining lamp heating with hot-wall heating. Lamps 10 are provided outside the furnace body 3 of a hot-wall CVD apparatus. The hot-wall reactor furnace body 3 is preheated to a prescribed temperature. Wafers W are loaded into the furnace body 3, and these wafers W are rapidly heated mediately thereafter to the desired temperature by light emitted by the lamps 10. The lamps 10 are switched off following heating, and the wafer temperature is allowed to reach a uniform state as a result of heat diffusion in the wafers in the hot-wall reactor furnace body 3. It is also possible to adopt an arrangement in which preheating commensurate with the cooling occurring during the transport period is performed before the wafers W are loaded into the furnace body 3. the wafers W are then loaded into the reactor furnace body 3.Type: GrantFiled: March 29, 2002Date of Patent: October 29, 2002Assignee: Kokusai Electric Co., Ltd.Inventors: Eisuke Nishitani, Katsuhisa Kasanami, Naoko Matsuyama, Shinya Sasaki
-
Publication number: 20020118907Abstract: An optical wiring substrate provides a slab optical waveguide having a refractive index different from a refractive index of other surrounding portions and a planar convex lens being provided continuously to a tip portion of an optical path of an optical wave guide including a core and cladding and formed on a substrate. The optical path of light passing through the planar convex lens is converted approximately by 90° with a mirror. The light reflected with the mirror is made as parallel light rays by use of a cylindrical lens.Type: ApplicationFiled: February 28, 2002Publication date: August 29, 2002Inventors: Akio Sugama, Masayuki Kato, Masatoshi Ishii, Shinya Sasaki, Tsuyoshi Aoki
-
Publication number: 20020096507Abstract: Uniformity of temperature is established within a wafer, and a higher throughput is achieved while the wafer heating time is dramatically reduced by combining lamp heating with hot-wall heating. Lamps 10 are provided outside the furnace body 3 of a hot-wall CVD apparatus. The hot-wall reactor furnace body 3 is preheated to a prescribed temperature. Wafers W are loaded into the furnace body 3, and these wafers W are rapidly heated immediately thereafter to the desired temperature by light emitted by the lamps 10. The lamps 10 are switched off following heating, and the wafer temperature is allowed to reach a uniform state as a result of heat diffusion in the wafers in the hot-wall reactor furnace body 3. It is also possible to adopt an arrangement in which preheating commensurate with the cooling occurring during the transport period is performed before the wafers W are loaded into the furnace body 3, the wafers W are then loaded Into the reactor furnace body 3.Type: ApplicationFiled: March 29, 2002Publication date: July 25, 2002Applicant: Kokusai Electric Co., Ltd.Inventors: Eisuke Nishitani, Katsuhisa Kasanami, Naoko Matsuyama, Shinya Sasaki
-
Patent number: 6414280Abstract: Uniformity of temperature is established within a wafer, and a higher throughput is achieved while the wafer heating time is dramatically reduced by combining lamp heating with hot-wall heating. Lamps 10 are provided outside the furnace body 3 of a hot-wall CVD apparatus. The hot-wall reactor furnace body 3 is preheated to a prescribed temperature. Wafers W are loaded into the furnace body 3, and these wafers W are rapidly heated immediately thereafter to the desired temperature by light emitted by the lamps 10. The lamps 10 are switched off following heating, and the wafer temperature is allowed to reach a uniform state as a result of heat diffusion in the wafers in the hot-wall reactor furnace body 3.Type: GrantFiled: March 30, 2000Date of Patent: July 2, 2002Assignee: Kokusai Electric Co., Ltd.Inventors: Eisuke Nishitani, Katsuhisa Kasanami, Naoko Matsuyama, Shinya Sasaki
-
Patent number: 6397667Abstract: A surface property measuring device includes a detector having a stylus, and a driving mechanism for causing the detector to advance and retreat along a surface to be measured. The measuring device further comprises a main shaft fixed to a frame of the driving mechanism in parallel with an advancing and retreating direction of the detector, and a slide block which is shaped like a rectangle in the advancing and retreating direction of the detector, sliding on the main shaft, the main shaft being inserted through two of a fore and a rear portion of the slide block. This results in improvement of the straightness accuracy in the movement of the detector, and reduces the cost while stabilizing the measurement accuracy.Type: GrantFiled: December 15, 1998Date of Patent: June 4, 2002Assignee: Mitutoyo CorporationInventors: Nobuyoshi Fujii, Satoshi Ueda, Tamenori Shirai, Shinya Sasaki
-
Publication number: 20020024699Abstract: An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: ApplicationFiled: July 19, 2001Publication date: February 28, 2002Applicant: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano
-
Publication number: 20010027033Abstract: A compact receptacle for mating connection with a complementary coaxial plug connector. The receptacle is in use to be mounted on a mobile phone for switching a signal line from an internal antenna to a vehicle's external antenna when placed on a cradle in a vehicle in mating connection with the plug connector on the cradle. The receptacle has a dielectric mold carrying an outer conductor shield fitted on top of the mold, a single spring member, and a single fixed contact member. The conductor shield includes an electrode socket for connection with an outer conductor tube of the plug. The spring member integrally carries a center electrode for connection with a center conductor post of the plug, and a movable contact which forms a normally-closed switch with a fixed contact on the fixed contact member for the above signal switching.Type: ApplicationFiled: March 30, 2001Publication date: October 4, 2001Applicant: Matsushita Electric Works, Ltd.Inventors: Masaki Fujimoto, Shuji Kato, Kenji Okura, Yoshihisa Inaba, Takeshi Hashimoto, Narutoshi Hoshino, Hiroyuki Tominaga, Shinya Sasaki
-
Patent number: 6296492Abstract: A compact receptacle for mating connection with a complementary coaxial plug connector. The receptacle is in use to be mounted on a mobile phone for switching a signal line from an internal antenna to a vehicle's external antenna when placed on a cradle in a vehicle in mating connection with the plug connector on the cradle. The receptacle has a dielectric mold carrying an outer conductor shield fitted on top of the mold, a single spring member, and a single fixed contact member. The conductor shield includes an electrode socket for connection with an outer conductor tube of the plug. The spring member integrally carries a center electrode for connection with a center conductor post of the plug, and a movable contact which forms a normally-closed switch with a fixed contact on the fixed contact member for the above signal switching.Type: GrantFiled: March 30, 2001Date of Patent: October 2, 2001Assignee: Matsushita Electric Works, Ltd.Inventors: Masaki Fujimoto, Shuji Kato, Kenji Okura, Yoshihisa Inaba, Takeshi Hashimoto, Narutoshi Hoshino, Hiroyuki Tominaga, Shinya Sasaki
-
Patent number: 6266169Abstract: An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: GrantFiled: October 1, 1999Date of Patent: July 24, 2001Assignee: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano
-
Patent number: 6265721Abstract: This invention provides an EDS detector in which even if connecting pipes vibrate due to gas flow, such vibration will not be transferred to a cryostat side and in which a small-sized gas-circulation-type refrigerator is provided in the cryostat sliding in a given direction, helium gas is supplied through the connecting pipes to the refrigerator, and an x-ray detecting element is cooled by means of the refrigerator. In connecting pipes, a connecting pipe body portion is connected to a pressure-converting value unit which is fixedly held in a vibration-proofing stand. Additionally, weights can be selectively applied to a flexible connecting pipe to further dampen vibrations.Type: GrantFiled: May 8, 1998Date of Patent: July 24, 2001Assignee: Horiba, Ltd.Inventors: Shigetoshi Arai, Shinya Sasaki
-
Patent number: 6018405Abstract: An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission over a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-toelectric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, and with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: GrantFiled: February 5, 1999Date of Patent: January 25, 2000Assignee: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano
-
Patent number: 6005699Abstract: An optical transmission system accomplishes optical transmission to a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accomplishes the optical transmission to a short distance by directly connecting the linear terminals therebetween, with an electric-to-optic converter replaced by an electric-to-optic converter having a semiconductor amplifier, with an optic-to-electric converter by an optic-to-electric converter having an avalanche photodiode as light receiver, an with no use of any optical booster amplifier and optical preamplifier in the multiplexing line terminal. With these, the optical transmission system can be easily constructed depending on the transmission distance required.Type: GrantFiled: September 11, 1997Date of Patent: December 21, 1999Assignee: Hitachi, Ltd.Inventors: Keiji Tomooka, Naohiro Sakakida, Shin Nishimura, Yoshihiro Ashi, Hironari Matsuda, Satoshi Aoki, Yukio Nakano, Masahiro Takatori, Toru Kazawa, Shinya Sasaki, Ryoji Takeyari, Hiroyuki Nakano