Abstract: A data communication system installed in an electric machine includes a transmission terminal and a reception terminal both mounted on the electric machine, a transmission-side opposed conductive member disposed on the transmission terminal, a transmission circuit for applying voltage between the transmission-side conductive member and the conductive body, thereby changing electric field generated on the entire surface of the conductive body, the voltage being changed according to information to be transmitted, a reception-side opposed conductive member provided on the reception terminal, thereby being capable of generating potential difference according to the electric field between the conductive body and the reception-side opposed conductive member, and a reception circuit for receiving the information based on a change in the potential difference between the conductive body and the reception-side opposed conductive member.

Abstract: A tire condition monitoring system monitoring a condition of a tire attached to a tire wheel, includes a tire side communication device mounted on the tire wheel for detecting an inner pressure of the tire and transmitting a result of detection by electromagnetic waves, a vehicle-body side communication device provided on a vehicle body including a plurality of components for receiving by electromagnetic waves information transmitted by the tire side communication device, a tire side modulator provided in the tire side communication device for superimposing information including the result of detection on electromagnetic waves, thereby outputting the electromagnetic waves as surface waves of the tire wheel, and a vehicle body side demodulator provided in the vehicle-body side communication device for receiving the electromagnetic waves propagated from the tire wheel to surfaces of the components of the vehicle body.

Abstract: A data communication system includes a terminal identification information adding unit generating a unit carrier wave including a predetermined plurality of periods of carrier waves and arranging the unit carrier wave in arrangement patterns differing at every transmission terminal to generate a unit carrier row signal shorter than one bit of the digital transmission data, a transmission timing determination unit detecting a binary inversion timing of the digital transmission data and causing the terminal identification information adding unit to transmit the unit carrier row signal every time the binary is inverted, a reception timing distinguishing unit generating a reception timing signal in synchronization with reception of the unit carrier row signal and collecting the reception timing signal of the unit carrier row signal of the same type, and a digital data restoring unit inverting the binary according to the collected reception timing signal, restoring the digital transmission data.

Abstract: An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the optical bypass transmission lines bypasses the corresponding one of the slave nodes. Each slave node includes an E/O converter and an optical cutoff circuit. Each of the E/O converters is controlled to flash for generating an optical signal, which is transmitted to a network. When any one of the slave nodes fails such that the corresponding E/O converter is maintained in a turned on state, the associated optical cutoff circuit forcibly switches the E/O converter to a turned off state. This suppresses a network crash caused by the failure maintaining the E/O converter in the turned on state.

Abstract: A data communication system installed in an electric machine includes a transmission terminal and a reception terminal both mounted on the electric machine, a transmission-side opposed conductive member disposed on the transmission terminal, a transmission circuit for applying voltage between the transmission-side conductive member and the conductive body, thereby changing electric field generated on the entire surface of the conductive body, the voltage being changed according to information to be transmitted, a reception-side opposed conductive member provided on the reception terminal, thereby being capable of generating potential difference according to the electric field between the conductive body and the reception-side opposed conductive member, and a reception circuit for receiving the information based on a change in the potential difference between the conductive body and the reception-side opposed conductive member.

Abstract: A tire information communication system mounted on a vehicle includes a tire-pressure detector mounted on a tire wheel for detecting a pressure of a tire and transmitting a result of detection, a tire monitor mounted on a vehicle body for obtaining information about tire pressure from the tire-pressure detector, a tire transmission circuit provided in the tire-pressure detector for applying AC voltage containing information about tire pressure between the tire wheel and an annular conductor of the tire so that a radio wave is radiated from the annular conductor, a vehicle ground isolation provided in the tire monitor so as to receive the radio wave from the annular conductor thereby to be capable of generating AC voltage between the vehicle ground and itself, and a body-side receiving circuit provided in the tire monitor and connected to the vehicle ground and the vehicle ground isolation respectively for obtaining the information about the tire pressure from the AC voltage generated between the vehicle groun

Abstract: A tire condition monitoring apparatus comprises transmitters and a receiver. Each transmitter is provided in a tire and the receiver is provided in a body frame of a vehicle. The apparatus further comprises initiators each corresponding to one of the transmitters. Based on a trigger signal from the corresponding initiator, each transmitter wirelessly transmits a predetermined determination signal, which includes tire information, two or more times in a fixed time period from the transmission circuit. The determination signal from the transmission circuit is received by the reception circuit of the receiver and a controller determines whether there is a match between the received determination signals. When there is a match, the position of the tire is located and the tire information is processed as valid information.

Abstract: A tire information communication system mounted on a vehicle includes a tire-pressure detector mounted on a tire wheel for detecting a pressure of a tire and transmitting a result of detection, a tire monitor mounted on a vehicle body for obtaining information about tire pressure from the tire-pressure detector, a tire transmission circuit provided in the tire-pressure detector for applying AC voltage containing information about tire pressure between the tire wheel and an annular conductor of the tire so that a radio wave is radiated from the annular conductor, a vehicle ground isolation provided in the tire monitor so as to receive the radio wave from the annular conductor thereby to be capable of generating AC voltage between the vehicle ground and itself, and a body-side receiving circuit provided in the tire monitor and connected to the vehicle ground and the vehicle ground isolation respectively for obtaining the information about the tire pressure from the AC voltage generated between the vehicle groun

Abstract: A vehicle appliance control system includes a main communication device having a main modulator superimposing, on electromagnetic waves, information including an operation command for operating an electrically-driven appliance and outputting the electromagnetic waves as surface waves of components of a vehicle and a plurality of secondary communication devices having respective secondary demodulators obtaining the information from the electromagnetic waves output by the main modulator to have propagated along surfaces of the components. The secondary communication devices are connected to the electrically-driven appliances or the passive appliances, are capable of communicating with the main communication device, and operate the electrically-driven appliances based on the operation command from the main communication device.

Abstract: A tire condition monitoring system monitoring a condition of a tire attached to a tire wheel, includes a tire side communication device mounted on the tire wheel for detecting an inner pressure of the tire and transmitting a result of detection by waves, a vehicle-body side communication device provided on a vehicle body including a plurality of components for receiving by waves information transmitted by the tire side communication device, a tire side modulator provided in the tire side communication device for superimposing information including the result of detection on electromagnetic waves, thereby outputting the electromagnetic waves as surface waves of the tire wheel, and a vehicle body side demodulator provided in the vehicle-body side communication device for receiving the electromagnetic waves propagated from the tire wheel to surfaces of the components of the vehicle body.

Abstract: A transmitter of a tire condition monitoring apparatus has an acceleration sensor, a transmission circuit, an antenna and a transmission controller. The transmitter is provided in a tire of a vehicle. The acceleration sensor detects a running state of the vehicle. The transmission circuit generates a transmission signal containing data representing a condition of the tire and outputs the transmission signal. The antenna wirelessly transmits the transmission signal. The transmission controller changes a transmission power of the transmission circuit according to a detection result of the running state detection device. This is capable of transmitting signals with an appropriate transmission power.

Abstract: An optical LAN terminal device includes an optical input connected to an external optical fiber so that an optical signal is supplied via the optical fiber to the input, an optical output connected to the optical fiber so that an optical signal is delivered via the optical fiber, a signal processor receiving an optical signal and carrying out electrical signal processing for the received optical signal, thereby being capable of generating and delivering a second optical signal, a bypass normally connecting the input and output to each other optically, a receiving branch branched off from the input or the bypass to transmit the optical signal from the input toward the signal processor, and a transmission branch branched off from the output or the bypass to transmit the optical signal from the signal processor toward the output.

Abstract: In an internal memory of a reception controller such as, for example, a ROM, a correction table is stored for correcting air pressure data. The reception controller receives a signal representing vehicle speed from a speedometer of the vehicle. The reception controller obtains a correction value from the correction table on the basis of the vehicle speed signal to add and deduct the correction value obtained and the air pressure data received. For this reason, the reception controller can obtain corrected air pressure data.

Abstract: In an optical LAN system, an optical connector is provided between the input and output optical fiber cables and each of the node devices. The optical connector includes a movable body (a switch body) having a prism. The movable body is switched selectively between a first position (a first state) at which the input and output optical fiber cables are optically connected to the node device and a second position (a second state) in which the input optical fiber cable and the output optical fiber cable are optically connected to each other in such a manner as to bypass the node device. This arrangement suppresses a network crash by means of a relatively simple configuration.

Abstract: A valve device attachable to a wheel including a tire in a state where the valve device penetrates through an opening of the wheel. The valve device includes a transmitter unit for detecting a condition of the tire and generating a transmission signal indicating the detected condition of the tire, a valve stem extending from the transmitter unit and an elastic member disposed to surround the valve stem. The elastic member has an annular attaching portion having a diameter greater than the diameter of the opening. The valve stem is attached to the wheel by passing the attaching portion through the opening by compressively deforming the attaching portion. The attaching portion includes a recessed portion for facilitating compressively deforming the attaching portion.

Abstract: A pressure sensor has a diaphragm that is exposed to air in a tire of a vehicle. A transmitter wirelessly transmits data representing the air pressure of the tire. A casing accommodates the transmitter and the pressure sensor. A lid closes an opening of the casing. A metal body is provided on the lid. When the opening of the casing is closed with the lid, the diaphragm is covered with the metal body.

Abstract: A tire condition monitoring apparatus comprises transmitters and a receiver. Each transmitter is provided in a tire and the receiver is provided in a body frame of a vehicle. The apparatus further comprises initiators each corresponding to one of the transmitters. Based on a trigger signal from the corresponding initiator, each transmitter wirelessly transmits a predetermined determination signal, which includes tire information, two or more times in a fixed time period from the transmission circuit. The determination signal from the transmission circuit is received by the reception circuit of the receiver and a controller determines whether there is a match between the received determination signals. When there is a match, the position of the tire is located and the tire information is processed as valid information.

Abstract: An optical LAN includes a master node, a plurality of slave nodes, and a plurality of optical fiber cables to configure a network. Each node transmits optical signals to the network and receives optical signals from the network. Each node includes: a light transmitting portion for transmitting optical signals to the network and an abnormality detecting portion. Based on the output level of a received optical signal, the abnormality detecting portion detects decrease in the light intensity of the light transmitting portion of the node that has transmitted the optical signal. Therefore, the master node acquires occurrence of an abnormality when an abnormality occurs in a light transmitting portion of a slave node in the network.

Abstract: A compact and light semiconductor sensor for detecting pressure and acceleration. A pressure sensor is formed on a first surface of an intermediate plate. An acceleration sensor is formed on a second surface of the intermediate plate. A first plate having a diaphragm is bonded to the intermediate plate to define a hermetic chamber of the pressure sensor. A second plate is bonded to the second surface of the intermediate plate. A spring support supports the mass in a manner relatively movable with respect to the second plate.

Abstract: An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the optical bypass transmission lines bypasses the corresponding one of the slave nodes. Each slave node includes an E/O converter and an optical cutoff circuit. Each of the E/O converters is controlled to flash for generating an optical signal, which is transmitted to a network. When any one of the slave nodes fails such that the corresponding E/O converter is maintained in a turned on state, the associated optical cutoff circuit forcibly switches the E/O converter to a turned off state. This suppresses a network crash caused by the failure maintaining the E/O converter in the turned on state.