Omron Corporation

Omron Automotive Electronics Co., Ltd.

Akitomo Tanaka

Hidemitsu Kawashima

Shuji Yamashita

Yasushi Hatakeyama

A radio transmitter for modulating a carrier wave in a predetermined frequency with given information to transmit the modulation signal through an antenna having a predetermined resonance frequency fhas a frequency changing section that changes the frequency of the carrier wave. The frequency changing section changes the frequency of the carrier wave to one of the resonance frequency fand a frequency f&#xd7;1/n, (wherein n is a given integer of at least 2, to change transmission output power.

Radio transmitter for modulating a carrier wave

A tire monitor device for a vehicle has a first antenna and a second antenna, a sensor unit attached to each of a front left tire, a front right tire, a back left tire, and a back right tire, and a determining unit. The tire monitor device is operable to transmit a response request signal from the first and second antennas with respect to at least one of the sensor units, and to monitor information of at least one of the tires based on a response signal returned from the at least one sensor unit in response to the response request signal. The first antenna is arranged at a position shifted by a predetermined amount in a left or right direction from an intermediate position between the front left and the front right tires. The second antenna is arranged at a position shifted by a predetermined amount in a left or right direction from an intermediate position between the back left and the back right tires. The sensor unit measures a reception level of the response request signal, and returns a measurement result in the response signal. The determining unit is operable to determine a position of each sensor unit based on information of the reception level of the response request signal contained in the response signal returned from each of the sensor units.

Tire monitor device

In a tire monitoring system for sufficiently reducing the possibility of cross talk generation of a request signal individually transmitted from a vehicle body side controller to each sensor unit, a vehicle body side antenna for transmitting the request signal and a tire side antenna for receiving the request signal are set to a coil antenna. The vehicle body side antenna is arranged above each tire such that a coil axis of the tire side antenna is set to be parallel to a rotating axis of each of tires, and a coil axis of the vehicle body side antenna is inclined with respect to the rotating axis. An inclination direction of the coil axis of the vehicle body side antenna is set so as to incline the coil axis of the vehicle body side antenna on a transversal outside of the vehicle toward a downward direction.

Tire monitoring system

A wireless terminal position detecting device for a portable device includes a plural n-number of transmission antennas disposed such that a portion of their reachable areas overlap, a signal dividing device for dividing a request signal into the plural n-number of divided parts, and a signal distributing device for causing the divided parts of the request signal to be transmitted sequentially from these transmission antennas. The position of the portable device is detected based on an answer signal returned from the portable device in response to the request signal.

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Kasugai, Japan

Akitomo Tanaka