Abstract: [Problem] To provide a server monitoring device capable of grasping the state of a server more rapidly than conventional ones, and a server monitoring system. [Solution] This server monitoring device has a configuration in which a plurality of optical fibers are optically coupled to a plurality of light-emitting elements each showing the operating state of a server by a lighting mode, and the end surfaces of the plurality of optical fibers on the opposite side to the light-emitting elements are secured in a predetermined arrangement. An image of a light emission pattern of the end surfaces of the optical fibers is captured by a camera, and the image is transmitted to a monitoring person.

Abstract: [Problem] To provide a server monitoring device capable of grasping the state of a server more rapidly than conventional ones, and a server monitoring system. [Solution] This server monitoring device has a configuration in which a plurality of optical fibers are optically coupled to a plurality of light-emitting elements each showing the operating state of a server by a lighting mode, and the end surfaces of the plurality of optical fibers on the opposite side to the light-emitting elements are secured in a predetermined arrangement. An image of a light emission pattern of the end surfaces of the optical fibers is captured by a camera, and the image is transmitted to a monitoring person.

Abstract: A vehicle includes an ABS, which controls braking force on wheels, and a tire condition monitoring apparatus, which detects the internal air pressure of tires. The dynamic rolling radius of the tires is computed based on signals from rotation sensor units of the ABS. The weight of a load carried by the vehicle is computed based on the dynamic rolling radius of the tires and the internal air pressure of the tires detected by the tire condition monitoring apparatus. When computing the load weight, a load weight determination map, which previously sets the relationship among the internal air pressure of the tires, the dynamic rolling radius of the tires, and the weight of the load carried by the vehicle, is used.

Abstract: A tire wear detection device includes a wear detector embedded in a tread of a tire, a sensor unit arranged on a wheel, and a receiver unit arranged on a vehicle body. The wear detector includes a piezoelectric element and a resonance circuit, which generates a radio wave signal from a voltage signal generated by the piezoelectric element. The sensor unit transmits through wireless communication a pressure data signal indicating an internal air pressure of the tire, generates a wear data signal indicating a wear state of the tire based on the received radio wave signal, and transmits through wireless communication the wear data signal. The receiver unit receives the pressure data signal and the wear data signal from the sensor unit.

Abstract: A tire condition monitoring apparatus including a keyless entry portable communication device capable of transmitting and receiving RF signals, sensor units, each of which is attached to a wheel and transmits, as an RF signal, a tire condition data signal, out-of-cabin antennas each corresponding to the wheel, and a control unit mounted on a vehicle body. The control unit executes a keyless entry function based on transmission and reception of RF signals with the portable communication device via the out-of-cabin antennas, and sends a command signal, which is an RF signal, to the sensor units through the out-of-cabin antennas. Upon receiving the command signal, the sensor unit executes an operation that corresponds to the command content of the command signal.

Abstract: A valve-integrated transponder includes an air valve and a casing that are integrated with each other, and is disposed within a tire. The air valve is press-fitted to a valve hole in a wheel rim. The casing houses a substrate having a detecting element mounted thereon, an inverse F antenna element, a supporting member, and the like, and is provided with a partition-like reinforcement rib. The reinforcement rib extends along an extension of an axis of the air valve and is loosely fitted in a recessed slot of the supporting member. The antenna element supported by the supporting member has a substantially line symmetrical shape where a pair of radiation conductors symmetrically extend away from each other.

Abstract: A valve-integrated transponder includes an air valve and a casing that are integrated with each other, and is disposed within a tire. The casing houses a substrate having a detecting element mounted thereon, an inverse F antenna element, and a supporting member. The antenna element has a substantially line symmetrical shape where a pair of radiation conductors extend away from each other. A longitudinal direction of the substrate is substantially perpendicular to an axial direction of the air valve, and a lateral direction of the substrate is inclined relative to a well of a wheel rim. The two radiation conductors of the antenna element disposed on the substrate are inclined at a predetermined angle with respect to the substrate, so as to be disposed substantially in parallel to the well that extends at the inner side of the transponder as viewed in the radial direction of the tire.

Abstract: A vehicle includes an ABS, which controls braking force on wheels, and a tire condition monitoring apparatus, which detects the internal air pressure of tires. The dynamic rolling radius of the tires is computed based on signals from rotation sensor units of the ABS. The weight of a load carried by the vehicle is computed based on the dynamic rolling radius of the tires and the internal air pressure of the tires detected by the tire condition monitoring apparatus. When computing the load weight, a load weight determination map, which previously sets the relationship among the internal air pressure of the tires, the dynamic rolling radius of the tires, and the weight of the load carried by the vehicle, is used.

Abstract: A tire pressure detecting device fixed to a wheel with a tire includes a pressure sensor detecting an internal pressure of the tire and transmits data of detection by the pressure sensor to a vehicle body by radio. The tire pressure detecting device further includes a compensation data storage storing compensation data for detection error specific to the pressure sensor and a compensation data transmitter obtaining the compensation data from the compensation data storage, transmitting the obtained compensation data to the vehicle body by radio.

Abstract: A tire valve unit is secured to a securing hole provided in a rim of a wheel of a vehicle. The tire valve unit includes a tire valve and a tire sensor. The tire valve includes a valve stem and an elastic cylindrical member encompassing the valve stem. The elastic cylindrical member has an annular securing groove in an outer circumferential surface of the elastic cylindrical member. A portion of the rim around the securing groove is fitted in the securing groove when the elastic cylindrical member is passed through the securing hole. The tire sensor is fixed to the valve stem. The tire sensor is arranged in the interior of a tire attached to the rim and capable of detecting the condition of the tire when the tire valve unit is secured to the rim. The elastic cylindrical member defines an annular space around the valve stem. The annular space extends from a position corresponding to the securing groove in an axial direction of the valve stem to communicate with the interior of the tire.

Abstract: A valve-integrated transponder includes an air valve and a casing that are integrated with each other, and is disposed within a tire. The air valve is press-fitted to a valve hole in a wheel rim. The casing houses a substrate having a detecting element mounted thereon, an inverse F antenna element, a supporting member, and the like, and is provided with a partition-like reinforcement rib. The reinforcement rib extends along an extension of an axis of the air valve and is loosely fitted in a recessed slot of the supporting member. The antenna element supported by the supporting member has a substantially line symmetrical shape where a pair of radiation conductors symmetrically extend away from each other.

Abstract: A valve-integrated transponder includes an air valve and a casing that are integrated with each other, and is disposed within a tire. The casing houses a substrate having a detecting element mounted thereon, an inverse F antenna element, and a supporting member. The antenna element has a substantially line symmetrical shape where a pair of radiation conductors extend away from each other. A longitudinal direction of the substrate is substantially perpendicular to an axial direction of the air valve, and a lateral direction of the substrate is inclined relative to a well of a wheel rim. The two radiation conductors of the antenna element disposed on the substrate are inclined at a predetermined angle with respect to the substrate, so as to be disposed substantially in parallel to the well that extends at the inner side of the transponder as viewed in the radial direction of the tire.

Abstract: A tire condition monitoring apparatus having a transmitter and a receiver is disclosed. The transmitter incorporates a battery having a positive electrode and a negative electrode. The transmitter wirelessly transmits a signal including data representing the condition of a tire of a vehicle using electromotive force produced by the battery. The receiver receives the signal from the transmitter and processes the signal. The transmitter includes a refresh circuit that performs refresh by forcibly supplying an electric current to the positive and negative electrodes of the battery. The transmitter measures the electromotive force of the battery after such refresh. If the electromotive force of the battery has not been recovered, the transmitter sends a notification signal indicating insufficiency of the electromotive force of the battery to the receiver. In response to the notification signal, the receiver announces insufficient capacity of the battery to the driver of the vehicle by means of a warning device.

Abstract: A tire monitor radio circuit includes a control circuit delivering a binary digital baseband signal, a modulation circuit having an oscillation circuit generating a carrier wave and switched between an oscillatory and a non-oscillatory states, an antenna resonance circuit having a coil and a capacitor both connected together, a resistance damping circuit having a switching element and a resistance and connected to the antenna resonance circuit, the resistance damping circuit being switchable between an operative and an inoperative states, and a compensation circuit putting the resistance damping circuit into the operative state when the modulation circuit is switched to the non-oscillatory state, the compensation circuit returning the resistance damping circuit to the non-operative state when or before the modulation circuit has been or is switched to the oscillatory state.

Abstract: A tire valve unit is secured to a securing hole provided in a rim of a wheel of a vehicle. The tire valve unit includes a tire valve and a tire sensor. The tire valve includes a valve stem and an elastic cylindrical member encompassing the valve stem. The elastic cylindrical member has an annular securing groove in an outer circumferential surface of the elastic cylindrical member. A portion of the rim around the securing groove is fitted in the securing groove when the elastic cylindrical member is passed through the securing hole. The tire sensor is fixed to the valve stem. The tire sensor is arranged in the interior of a tire attached to the rim and capable of detecting the condition of the tire when the tire valve unit is secured to the rim. The elastic cylindrical member defines an annular space around the valve stem. The annular space extends from a position corresponding to the securing groove in an axial direction of the valve stem to communicate with the interior of the tire.

Abstract: A transmitter in an apparatus for monitoring a condition of a tire of a vehicle includes a circuit portion and a casing that accommodates the circuit portion. The casing has a first pressure transmitting portion that transmits the pressure in the tire to the circuit portion so that the circuit portion can detect the pressure in the tire. The pressure transmitted to the circuit portion through the first pressure transmitting portion produces force that presses the circuit portion. The casing further has a second pressure transmitting portion that transmits the pressure in the tire to the circuit portion to apply force that acts against the pressing force to the circuit portion. Therefore, the transmitter prevents a substrate from flexing.

Abstract: A tire pressure detection side receiving circuit includes an antenna resonance circuit having an antenna, a capacitor and a coil, a capacitance changing circuit for changing a capacitance of the capacitor, an oscillation circuit capable of imparting a test wave to the antenna resonance circuit, a resonance level detector capable of detecting a resonance level of the antenna resonance circuit, a memory storing preset reference frequency, a resonance frequency detector changing a frequency of the test wave to be imparted to the antenna resonance circuit while the capacitor of the antenna resonance circuit is maintained at a constant capacitance, thereby detecting, as a measured resonance frequency, a frequency in a case where an amplitude level of the test wave has reached a peak, and a tuning control controlling the capacitance changing circuit and changing the capacitor capacitance so that the measured resonance frequency is approximated to a reference frequency.

Abstract: A tire monitor radio circuit includes a control circuit delivering a binary digital baseband signal, a modulation circuit having an oscillation circuit generating a carrier wave and switched between an oscillatory and a non-oscillatory states, an antenna resonance circuit having a coil and a capacitor both connected together, a resistance damping circuit having a switching element and a resistance and connected to the antenna resonance circuit, the resistance damping circuit being switchable between an operative and an inoperative states, and a compensation circuit putting the resistance damping circuit into the operative state when the modulation circuit is switched to the non-oscillatory state, the compensation circuit returning the resistance damping circuit to the non-operative state when or before the modulation circuit has been or is switched to the oscillatory state.

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 tire pressure detection side receiving circuit includes an antenna resonance circuit having an antenna, a capacitor and a coil, a capacitance changing circuit for changing a capacitance of the capacitor, an oscillation circuit capable of imparting a test wave to the antenna resonance circuit, a resonance level detector capable of detecting a resonance level of the antenna resonance circuit, a memory storing preset reference frequency, a resonance frequency detector changing a frequency of the test wave to be imparted to the antenna resonance circuit while the capacitor of the antenna resonance circuit is maintained at a constant capacitance, thereby detecting, as a measured resonance frequency, a frequency in a case where an amplitude level of the test wave has reached a peak, and a tuning control controlling the capacitance changing circuit and changing the capacitor capacitance so that the measured resonance frequency is approximated to a reference frequency.