Furuno Electric Company Limited

Super Wave Corporation

Aquafusion, Ltd.

Ntt Docomo, Inc.

Matsumura Oil Research Corp.

Shionoya Yasuo

Miyaken Co., Ltd.

Toyoki Sasakura

Kenichi Miyamoto

Ikuo Matsuo

Mitsuru Murata

Hironori Ishikawa

Hideharu Morimatsu

Hiroshi Iino

Yasuhiko Endo

Genzi Mori

Shinichi Sakuta

Yukio Morimoto

An underwater information visualization device, which is installed on a moving body such as a ship traveling near a water surface and visualizes and displays information about fish in the water and the seabed using an ultrasonic wave, includes circuitry that generates a pseudo noise sequence signal and a modulation circuit that modulates a carrier signal to form a transmission signal, emits a transmission signal as an ultrasonic wave into the water, receives an echo of an ultrasonic wave, determines an echo corresponding to a transmission signal by subjecting the echo to correlation processing with a pseudo noise sequence signal, displays an output signal. The display simultaneously displays multiple reception signals on a screen, and a period of transmission signals is (2D/Vu) or less when an underwater sonic wave speed is Vu and a distance to the seabed is D.

Underwater information visualizing device

An echo measuring apparatus has: a transmission signal forming unit for forming a transmission signal by a pseudo noise sequence signal; a transmitting unit for transmitting the transmission signal as an ultrasonic wave into the water; a receiving unit for receiving an echo of the ultrasonic wave; and a correlator for discriminating the echo corresponding to the transmission signal by executing a correlating process to the echo by the pseudo noise sequence signal and measuring a distance to a measurement target on the basis of a time difference between the transmission signal and the echo, wherein assuming that a velocity of a sound wave in the water is equal to Vu and the distance to the measurement target is equal to D, a period of the transmission signal includes a case where it is equal to or less than (2D/Vu).

Echo measuring apparatus, echo sounding apparatus, multibeam echo measuring apparatus, multibeam echo sounding apparatus and aperture synthetic sonar

A first communication device performs a first, a second, and a third authentication processing for a second communication device, a authentication station sends to the first communication device a confirmation signal indicating that a person's identity is confirmed, when the authentication station succeeds the authentication of the second communication device, so that the authentication station validates the cancellation of a usage restrictions of the controlled device imposed by the first communication device based on the cancellation permission signal.

Wireless authentication method and wireless authentication system

A security system capable of safely performing home device state check or operation. In the security system, a mobile telephone module of a mobile telephone transmits M-series data (call signal) to home device modules provided in home devices such as a door lock and home electric appliances. In response to this call, the home device module returns a home device ID to the mobile telephone module. The mobile telephone module authenticates the home device module according to the home device ID and after authentication, returns a mobile telephone ID and state check or operation command to the home device module. The home device module authenticates the mobile telephone module according to the mobile telephone ID. When this mutual authentication is complete, the home device module performs the home device state check or operation according to the command and returns the result to the mobile telephone module. Thus, the state check or operation is performed after mutual authentication and it is possible to prevent an unauthorized access of a third person.

Home security system

The present invention provides an authentication card inserted to a portable device. The authentication cardis inserted (installed) in a cellular phoneand the authentication cardis inserted (installed) in a PDA. The authentication cardcomprises an identification code transmission unitand the authentication cardcomprises a usage restriction cancellation unit. The unitsandexchange the identification code by means of wireless signal and mutually authenticate the identification code mutually. In case that the PDAis moved more than the predetermined distance from the cellular phoneand the reception level of signal from the unitreceived by the unitis smaller than the predetermined value, or the unitcan not authenticate the identification code of the unit, the unitstops transmission of the usage restriction cancellation signal to the PDA

Authentication card and wireless authentication system performing mutual authentication by means of the authentication card

Non-reception-controlled area information is stored in the non-reception-controlled area storage section of the reception control device for each mobile device ID. When the reception control device receives the disconnection signal and position information from the mobile device in accordance with the mobile device moving away from the key terminal, the presence/absence determination section determines whether or not the mobile device is within the aforementioned area. As a result of the determination, if the current position of the mobile device is within the aforementioned area, control for enabling reception for the mobile device is performed, and if the current position is outside the aforementioned area, control for disabling reception for the mobile device is performed.

Function-limiting device and function-limiting method

A use prohibition system which can disable a cellular phone or any other device if it separates more than a predetermined distance from the user, and at the same time give a warning to the user. It includes an identification signal transmission unit and a use prohibition mode canceling unit attached or mounted to the cellphone. Each unit has a transmitter and a receiver. The receiver of the canceling unit receives an ID code signal from the transmission unit and produces, based on the ID signal received, a use prohibition canceling signal. The canceling unit returns a confirmation signal to the transmission unit. If the two units separate more than a predetermined distance from each other, the levels of the ID signal and the confirmation signal received by the respective units drop below a predetermined value. Thus, the canceling unit stops producing the canceling signal to disable the cellphone, while the transmission unit sounds an alarm.

Device for prohibiting unauthorized use of electronic devices

The present invention provides flexibility in the shape and material of the cleaning vessel, enables high-power transmission of ultrasonic waves, and reduces audible noise generation. An ultrasonic cleaning machine according to the invention comprises an acoustic lens mounted above an ultrasonic transducer which is immersed in oil held within an external tank as well as a cleaning vessel holding a cleaning liquid further above the acoustic lens so that ultrasonic waves produced by the ultrasonic transducer converge at a point within the cleaning liquid. In one form of the invention, the cleaning vessel is eliminated and the cleaning liquid is held directly in the external tank.

Ultrasonic cleaning machine

High resolution measuring method and apparatus

The present invention relates to a beam forming device for forming a uniform radiation beam and/or a reception beam. In radiation, the transducer is vibrated in such a way that the pressure of a sound wave produced from each point of the vibrating surface of the transducer is determined based on a weight function, thereby forming a radiation beam. In reception, electric signals are derived based on the sound energy received in a manner that the amplitude level of an electric signal produced based on the sound energy received by each point of the vibrating surface of the transducer is determined based on a weight function, and the derived signals are combined with one another to form a reception beam.

Beam forming device

The present invention is directed to a detection system which forms reception beams successively in a series of angular directions. The detection system comprises receiving means for receiving incoming signals in such a manner that the frequency of the incoming signals is varied in accordance with the Doppler effect, and a matched filter for pulse-compressing output signals from said receiving means, with output signals from said matched filter being displayed in an indicator.

Growing community of inventors

Tokyo, Japan

Toyoki Sasakura