1
Shigeru Oikawa, Yuzo Katayama, Norio Takato, Takashi Kurokawa: Coordinate input apparatus. Nippon Telegraph and Telephone Public Corporation, Charles E Pfund, March 16, 1982: US04320292 (60 worldwide citation)

A coordinate input apparatus. A pair of optical guide channel arrays each including a required number of parallel optical guide channels (11, 12) which contain optical scatterer (22) are superposed to form an input board (100) with the optical guide channels of the two arrays intersected at right an ...


2
Katsuhiko Hirabayashi, Hiroyuki Tsuda, Takashi Kurokawa: Liquid crystal Fabry-Perot etalon with glass spacer. Nippon Telegraph and Telephone Corporation, Spencer Frank & Schneider, June 14, 1994: US05321539 (55 worldwide citation)

A tunable wavelength-selective filter includes a glass substrate, a transparent electrode layer, a highly reflective mirror, an alignment layer, a liquid crystal layer, another alignment layer, a transparent material layer whose refractivity index is substantially equal to that of the liquid crystal ...


3
Takashi Kurokawa, Hiroyuki Tsuda, Katsunari Okamoto, Kazunori Naganuma, Tetsuyoshi Ishii, Hirokazu Takenouchi: Optical signal processing apparatus and optical signal processing method. Nippon Telegraph & Telephone Corporation, Workman Nydegger & Seeley, September 19, 2000: US06122419 (45 worldwide citation)

The present invention relates to an optical signal processing apparatus and optical signal processing method which enable generation, waveform shaping, waveform measurement, waveform recording, correlation processing, and the like of optical pulses of 1-10 ps. A basic construction of the optical sig ...


4
Takashi Kurokawa: Exhaust system for chemical vapor deposition apparatus. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, August 26, 1986: US04608063 (38 worldwide citation)

An exhaust system comprising an exhaust device and a collecting device incorporating a filter and positioned in front of the exhaust device, the exhaust system being adapted for use in a chemical vapor deposition apparatus, wherein at least a part of the collecting device is heated.


5
Yasushi Fujioka, Takashi Kurokawa, Masahiro Kanai, Masafumi Sano, Takehito Yoshino, Yuzo Kohda: Glow discharge apparatus for continuously manufacturing semiconductor device comprising gas gates with slotted rollers. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, November 30, 1993: US05266116 (38 worldwide citation)

An apparatus continuously manufactures a semiconductor device. A plurality of glow discharge regions are connected by gas gates. A sufficiently long belt-shaped substrate having a desired width is arranged along a path in which the substrate sequentially penetrates the glow discharge regions. The be ...


6
Hiroyuki Tsuda, Takashi Kurokawa, Koji Nonaka: All-optical switch apparatus using a nonlinear etalon. Nippon Telegraph & Telephone Corporation, Frishauf Holtz Goodman & Woodward, December 31, 1991: US05076672 (36 worldwide citation)

An all-optical swtich apparatus having an optical gate which is unitarily composed of a nonlinear etalon and a pair of GRIN lenses, or a nonlinear etalon and a GRIN lens, and having collimating GRIN lenses, each of which guides a signal beam and a control beam to the optical gate. The resonance wave ...


7
Seiji Fukushima, Takashi Kurokawa, Takashi Kozawaguchi, Shinji Matsuo: Spatial light modulator and spatial light modulating apparatus with alignment film having particular conductance. Nippon Telegraph and Telephone Corporation, Frishauf Holtz Goodman & Woodward, July 14, 1992: US05130830 (28 worldwide citation)

A spatial light modulator has a photoconductive layer deposited on one glass substrate having a transparent electrode. A first liquid crystal alignment film is formed on the photoconductive layer. A second liquid crystal alignment film is formed on another glass substrate having another transparent ...


8
Takashi Kurokawa, Norio Takato, Shigeru Oikawa, Yuzo Katayama: Polymer optical circuit with optical lead-fibers and method of fabricating the same. Nippon Telegraph and Telephone Public Corporation, Frishauf Holtz Goodman & Woodward, December 23, 1980: US04240849 (27 worldwide citation)

A polymer optical circuit with optical lead-fibers which comprise a plurality of optical fibers, each one end portion thereof being embedded in a transparent polymer film formed on a substrate, and polymer optical waveguides formed in the film between the embedded ends of the optical fibers so that ...


9
Yoshitaka Ohiso, Yoshio Itoh, Chikara Amano, Yoshitaka Kohama, Kouta Tateno, Hirokazu Takenouchi, Takashi Kurokawa: Vertical-cavity surface-emitting laser and method for manufacturing the same. Nippon Telegraph & Telephone Corporation, Frishauf Holtz Goodman Langer & Chick P C, October 3, 2000: US06127200 (17 worldwide citation)

A vertical-cavity surface-emitting semiconductor laser has first and second semiconductor multi-layered films, an active layer, and third and fourth semiconductor multi-layered films which are piled up on a GaAs substrate in that order. Furthermore, the first film is formed by piling up Al.sub.x-1 G ...


10
Chikara Amano, Shinji Matsuo, Hideki Hukano, Takashi Kurokawa, Takeshi Yamada: Optical modulator gate array including multi-quantum well photodetector. Nippon Telegraph & Telephone Corporation, Blakely Sokoloff Taylor & Zafman, September 19, 1995: US05451767 (14 worldwide citation)

An optical gate array includes a photodetector, an optical modulator, and a reflecting structure arranged therebetween. The photodetector, the optical modulator, and the reflecting structure are composed of semiconductor materials. The photodetector includes an MQW (Multi Quantum Well). The reflecti ...