Abstract: A wireless device wherein a first reception block carries out carrier sensing operation to check a condition of interfering wave before a first transmission block transmits a signal, and the first reception block halts operation thereof and makes the first transmission block transmit the signal when the first reception block confirms that the condition of interfering wave is within a predetermined range, or executes retry operation for carrying out the career sensing operation again when it confirms that the condition of interfering wave is outside of the predetermined range as a result of the career sensing operation.

Abstract: A power supply controller includes a power supply section, a power supply controlling section connected to the power supply section, a starter switch being switched selectively to a first status and a second status, a o power switch being switched selectively to a first status and a second status, a controlling section connected to the power switch, and a function section operable to execute a predetermined operation. The power supply controlling section causes a power to be supplied from the power supply section to the controlling section when at least one of the power switch and the starter switch is in the first status. This power supply controller does not malfunction even when the starter switch malfunctions, thus preventing wasteful consumption of the power supply section.

Abstract: A present locking device is a locking device for locking/unlocking a lock of a door of a closed space, including: a first transmission antenna for transmitting a first signal to a range including an outside of the closed space; a second transmission antenna for transmitting a second signal to an inside of the closed space as a target; a key which transmits a first response signal when receiving the first signal and not receiving the second signal, and which transmits a second response signal when receiving the first signal and also receiving the second signal; a reception antenna for receiving at least the first response signal from the key; and a control unit for controlling whether locking or unlocking can be performed on the lock or not, based at least on whether the reception antenna receives the first response signal or not.

Abstract: A wireless sensor system includes a wireless sensor, a wireless device, and a magnetic field generator connected to the wireless device. The wireless sensor includes an ambience sensor that detects status of an ambient environment to output ambient data depending on the detected status of the ambient environment, a magnetic sensor that senses a magnetic field, a radio-frequency (RF) transmitter that sends the ambient data to the wireless device using a radio wave, and a first controller that is connected to the ambience sensor, the magnetic sensor, and the RF transmitter. The wireless device includes an RF receiver that receives the radio wave sent from the RF transmitter; and a second controller that is connected to the RF receiver and that outputs a control signal for controlling the first controller. The magnetic field generator includes a coil for sending the control signal to the magnetic sensor using a magnetic field.

Abstract: A vehicle antitheft system includes an immobilizer unit and a portable unit. Each of the units includes an antenna, a communication part, a data processor, and storages. The immobilizer unit and the portable unit authenticate each other, based on a highly encrypted authentication method, using at least first data for mutual authentication. Thereafter, the first data for mutual authentication or second data for mutual authentication different from the first data for mutual authentication is stored in the storages of the immobilizer unit and the portable unit.

Abstract: A present locking device is a locking device for locking/unlocking a lock of a door of a closed space, including: a first transmission antenna for transmitting a first signal to a range including an outside of the closed space; a second transmission antenna for transmitting a second signal to an inside of the closed space as a target; a key which transmits a first response signal when receiving the first signal and not receiving the second signal, and which transmits a second response signal when receiving the first signal and also receiving the second signal; a reception antenna for receiving at least the first response signal from the key; and a control unit for controlling whether locking or unlocking can be performed on the lock or not, based at least on whether the reception antenna receives the first response signal or not.

Abstract: The authentication apparatus disclosed here is formed of a unit to be controlled and a plurality of portable devices having communication with the unit via radio waves. The unit has a first controller, a first transmitter controlled by the first controller and a first receiver. Each of the portable devices has a second controller, a storage section that stores the replying order of the portable devices and is controlled by the second controller, a second transmitter and a second receiver. In response to communication signals sent from the first transmitter of the unit to each of the second receivers, each portable device replies with a first communication signal according to the replying order stored in the storage section. The first communication signal is sent back to the unit from each device with a predetermined time difference so as not to produce an overlapped period in the replying time.

Abstract: A vehicle antitheft system includes an immobilizer unit and a portable unit. Each of the units includes an antenna, a communication part, a data processor, and storages. The immobilizer unit and the portable unit authenticate each other, based on a highly encrypted authentication method, using at least first data for mutual authentication. Thereafter, the first data for mutual authentication or second data for mutual authentication different from the first data for mutual authentication is stored in the storages of the immobilizer unit and the portable unit.