1
Kazue Otsuka, Hiroshi Onaka, Takafumi Terahara, Takao Naito: Method and apparatus for scrambling the polarization of signal lights forming a wavelength division multiplexed signal light. Fujitsu, Staas & Halsey, November 24, 1998: US05841557 (49 worldwide citation)

A method and apparatus for scrambling the polarization of signal lights combined into a wavelength division multiplexed signal light, to suppress non-linear optical effect and thereby improve transmission quality. For example, each signal light has a different polarization before being combined into ...


2
Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda, Hideo Kuwahara, Hiroshi Onaka, Hideyuki Miyata: Polarization diversity optical receiver for coherent optical communication. Fujitsu, Staas & Halsey, October 23, 1990: US04965858 (37 worldwide citation)

A polarized wave diversity optical receiver for coherent optical communication including: an optical local oscillating circuit (7) for oscillating local oscillating light; a mixing circuit (8) for mixing signal light and the local oscillating light to obtain two polarized components; a detecting cir ...


3
Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda, Hideo Kuwahara: Receiver for coherent optical communication. Fujitsu, Staas & Halsey, May 19, 1992: US05115332 (34 worldwide citation)

A receiver for coherent optical communication in a phase diversity system. An optical hybrid circuit receives a signal beam and receives a local-oscillator beam which has a predetermined phase shift. The optical hybrid circuit branches each beam into pairs, each pair having one signal beam and one l ...


4
Takashi Mori, Shuuji Hosokawa, Takao Naito: Power-driven screwdriver with a torque control. Matsushita Electric Industrial Company, Lowe King Price & Becker, December 6, 1983: US04418765 (32 worldwide citation)

A screw tightening apparatus comprises a motor-driven screwdriver bit supported on a base for tightening a screw with a torque which is detected as a reactive force acting on the base by a torque detector. An output signal from the torque detector is amplified and delivered to a comparator in which ...


5
Takao Naito: Wavelength division multiplexing optical transmission system and optical transmitting device used in the transmission system. Fujitsu, Helfgott & Karas P C, March 2, 1999: US05877879 (31 worldwide citation)

An optical transmitting device suitable for use in a wavelength division multiplexing optical transmission system for transmitting a plurality of optical signals different in wavelength through a transmission line. The optical transmitting device includes a plurality of electro-optical converters fo ...


6
Naoichi Chikahisa, Ken Takahashi, Takao Naito, Takashi Sasaki: Automatic squeegee angle and pressure adjusting means. Matsushita Electric Industrial, Wenderoth Lind & Ponack, January 2, 1996: US05479854 (27 worldwide citation)

A screen printing machine in which a squeegee is driven to form a film of solder on a board through a screen, includes an automatic squeegeeing angle setter which includes a squeegeeing angle adjuster for adjusting a squeegeeing angle of the squeegee and a squeegeeing angle detector for detecting th ...


7
Akio Nakanishi, Ken ichi Ikegaya, Takao Naito, Yukio Sejima, Koji Matsushima: Over-discharge protection circuitry. Fujitsu, Staas & Halsey, January 5, 1993: US05177426 (26 worldwide citation)

An over-discharge protection circuit included in a charge circuit in a portable apparatus having a portable portion and a body, the portable portion and body being interconnected by two charging terminals of the body and two terminals of the portable portion when the portable portion is placed on th ...


8
Ken Takahashi, Naoichi Chikahisa, Takao Naito, Tetsuya Tanaka: Apparatus and method for centering a printing screen over an object. Matsushita Electric Industrial, Wenderoth Lind & Ponack, March 24, 1998: US05730051 (24 worldwide citation)

A screen printing apparatus includes: a positioning stage for positioning an object and a plate arranged above it; printing squeegees which are moved horizontally on the plate for printing through the plate onto the object; a driver for moving the positioning stage; a horizontal driver for moving th ...


9
Youichi Akasaka, Takao Naito, Satoshi Mizutani: System and method for communicating wireless data utilizing a passive optical network. Fujitsu, Baker Botts L, January 31, 2012: US08107815 (23 worldwide citation)

In one embodiment, a method for providing wireless communications utilizing a passive optical network (PON) is disclosed. The method includes receiving, at a PON, downstream packets from a base station destined for a mobile station, and transmitting the downstream packets to wireless transceivers as ...


10
Takao Naito, Terumi Chikama, Shigeki Watanabe, Tetsuya Kiyonaga, Yoshihito Onoda: Heterodyne receiver for coherent optical communication. Fujitsu, Staas & Halsey, September 24, 1991: US05052051 (22 worldwide citation)

After mixing the signal light and the local oscillation light with a mixing circuit, two intersecting polarization components are divided by a polarization splitter and respective components are subjected to heterodyne detection by optical receivers. Thereafter, in an electric signal stage, the inte ...