Abstract: A vehicle communication apparatus has a main battery, and the main battery is switched to a supplemental battery when voltage of the main battery falls to a second threshold. Further, prior to voltage fall of the main battery to the second threshold, vehicle information at least including position of a vehicle is prepared for transmission from a report unit. By adapting the above voltage monitoring scheme, the removal of the main battery is appropriately detected, and the position information of the vehicle is appropriately reported wirelessly to an information center by the report unit, and working time of the report unit that is operated by the supplemental battery is extended without increasing the capacity of the supplemental battery.

Abstract: A vehicle communication apparatus has a main battery, and the main battery is switched to a supplemental battery when voltage of the main battery falls to a second threshold. Further, prior to voltage fall of the main battery to the second threshold, vehicle information at least including position of a vehicle is prepared for transmission from a report unit. By adapting the above voltage monitoring scheme, the removal of the main battery is appropriately detected, and the position information of the vehicle is appropriately reported wirelessly to an information center by the report unit, and working time of the report unit that is operated by the supplemental battery is extended without increasing the capacity of the supplemental battery.

Abstract: When a radio communication module for electronic license plates is installed on a license plate, the following procedure is taken: an attaching portion and an enclosure integrated with it are fixed on a license plate with a bolt. Further, a protruded portion fixed on the attaching portion is engaged into the license plate, and the rotation of the radio communication module for electronic license plates on the bolt is thereby suppressed.

Abstract: With a capacitor C inserted in an interstage portion of multiple stages of amplifier circuits, a high pass filter is generated by the capacitor C and an input impedance |Z| of an amplifier circuit in the next stage. Accordingly, frequency components lower than a cutoff frequency fc are cut off, and therefore are not transferred to the subsequent stage. However, radio frequency components higher than or equal to a fundamental wave component determined by an envelope of a radio frequency signal intermittently transmitted can be transferred. Consequently, transfer of DC offset potentials can be cut off, and noise, such as flicker noise, having great power in a DC or near-DC zone can be effectively cut off. Thereby, the S/N ratio, detection sensitivity, and detection accuracy can be improved.

Abstract: A radio communication module to be installed on a license plate of a vehicle has a module body and a removal protector. The module body is provided with a memory device, which stores a vehicle information, and a radio communication portion, which transmits and receives an electromagnetic wave to exchange the vehicle information with an outer apparatus. The removal protector is for protecting the module body from a detachment from the license plate to prevent the vehicle information from being used by a third person.

Abstract: A wireless communication module, which is to be installed on a license plate of a vehicle, has a memory device, a wireless communication circuit, a battery and a housing. The memory device stores vehicle information such as a registration number of the vehicle. The wireless communication circuit performs wireless communication with an outer apparatus to exchange the vehicle information. The battery supplies electric power to the memory device and to the wireless communication circuit. The housing receives the memory device, the wireless communication circuit and the battery therein and is to be fixed to the license plate.

Abstract: An installation construction of a radio communication module on a license plate of a vehicle includes the followings: the radio communication module provided with a housing having an engaging portion and a fixing hole; an engagement of the engaging portion with a rim of the license plate; and a screw-fastening of a bolt inserted in the fixing hole to screw-fasten the radio communication module together with the license plate to the vehicle.

Abstract: When a radio communication module for electronic license plates is installed on a license plate, the following procedure is taken: an attaching portion and an enclosure integrated with it are fixed on a license plate with a bolt. Further, a protruded portion fixed on the attaching portion is engaged into the license plate, and the rotation of the radio communication module for electronic license plates on the bolt is thereby suppressed.

Abstract: A start signal output circuit having an RF/DC conversion circuit to which radio frequency power (RF) of specified frequency is inputted and from which a direct current potential (DC) is outputted, comprises a detection/amplification circuit 210 which includes a voltage doubler wave-detector circuit 10 configured including a sensing diode Q1 (Tr34) for sensing the RF power, a differential amplifier including differential pair transistors Tr31 and Tr32, and a current mirror circuit. A base current of one Tr31 of the differential pair transistors is brought into substantial agreement with a DC component of a current flowing through the sensing diode Q1 (Tr34). A total of currents flowing through the differential pair transistors Tr31 and Tr32 is regulated to a substantially constant value by the current mirror circuit. Thus, the start signal output circuit which is small in size, high in sensitivity and low in power consumption can be realized.

Abstract: A wireless device to be mounted on a license plate of an automobile is composed of a casing, components contained in the casing and an operating member inserted into the casing. A battery for supplying power to the components is selectively turned on or off by controlling an insertion depth of the operating member into the casing. At an initial depth, the power supply is turned on for testing the wireless device at a manufacturing plant. At an intermediate depth, the power supply is turned off to save energy consumption in periods of transportation or storage. At a final depth, the power supply is finally turned on for actual use of the wireless device, and the casing is hermetically closed by the operating member.

Abstract: With a capacitor C inserted in an interstage portion of multiple stages of amplifier circuits, a high pass filter is generated by the capacitor C and an input impedance |Z| of an amplifier circuit in the next stage. Accordingly, frequency components lower than a cutoff frequency fc are cut off, and therefore are not transferred to the subsequent stage. However, radio frequency components higher than or equal to a fundamental wave component determined by an envelope of a radio frequency signal intermittently transmitted can be transferred. Consequently, transfer of DC offset potentials can be cut off, and noise, such as flicker noise, having great power in a DC or near-DC zone can be effectively cut off. Thereby, the S/N ratio, detection sensitivity, and detection accuracy can be improved.

Abstract: A wireless communication module, which is to be installed on a license plate of a vehicle, has a memory device, a wireless communication circuit, a battery and a housing. The memory device stores a vehicle information such as a registration number of the vehicle. The wireless communication circuit performs a wireless communication with an outer apparatus to exchange the vehicle information. The battery supplies electric power to the memory device and to the wireless communication circuit. The housing receives the memory device, the wireless communication circuit and the battery therein and is to be fixed to the license plate.

Abstract: A wireless device to be mounted on a license plate of an automobile is composed of a casing, components contained in the casing and an operating member inserted into the casing. A battery for supplying power to the components is selectively turned on or off by controlling an insertion depth of the operating member into the casing. At an initial depth, the power supply is turned on for testing the wireless device at a manufacturing plant. At an intermediate depth, the power supply is turned off to save energy consumption in periods of transportation or storage. At a final depth, the power supply is finally turned on for actual use of the wireless device, and the casing is hermetically closed by the operating member.

Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it comprises one or more compounds of the general formula I in which R, A1, Z1, Y and L are as defined in claim 1.

Abstract: A start signal output circuit having an RF/DC conversion circuit to which radio frequency power (RF) of specified frequency is inputted and from which a direct current potential (DC) is outputted, comprises a detection/amplification circuit 210 which includes a voltage doubler wave-detector circuit 10 configured including a sensing diode Q1 (Tr34) for sensing the RF power, a differential amplifier including differential pair transistors Tr31 and Tr32, and a current mirror circuit. A base current of one Tr31 of the differential pair transistors is brought into substantial agreement with a DC component of a current flowing through the sensing diode Q1 (Tr34). A total of currents flowing through the differential pair transistors Tr31 and Tr32 is regulated to a substantially constant value by the current mirror circuit. Thus, the start signal output circuit which is small in size, high in sensitivity and low in power consumption can be realized.

Abstract: A radio communication module to be installed on a license plate of a vehicle has a module body and a removal protector. The module body is provided with a memory device, which stores a vehicle information, and a radio communication portion, which transmits and receives an electromagnetic wave to exchange the vehicle information with an outer apparatus. The removal protector is for protecting the module body from a detachment from the license plate to prevent the vehicle information from being used by a third person.

Abstract: An installation construction of a radio communication module on a license plate of a vehicle includes the followings: the radio communication module provided with a housing having an engaging portion and a fixing hole; an engagement of the engaging portion with a rim of the license plate; and a screw-fastening of a bolt inserted in the fixing hole to screw-fasten the radio communication module together with the license plate to the vehicle.

Abstract: Liquid-crystalline mediums based on a mixture of polar compounds having positive dielectric aniostropy, characterized in that they comprise one or more compounds of the general formula I in which R, A1, Z1, Y and L are as defined herein, are suitable for use in MLC, TN and STN dispalys.

Abstract: Liquid crystalline media comprising a dielectrically positive component A, comprising compounds of formula I wherein the parameters have the meanings given herein, are suitable for use in liquid crystal displays, especially to active matrix displays and in particular IPS displays.

Abstract: The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having negative dielectric anisotropy, which contains at least one compound of formula I wherein R1 and R2 are independently of each other an alkyl, alkoxy or alkenyl group with 1 to 12 C atoms, it also being possible for one or more CH2 groups in these radicals to be replaced, in each case independently of one another, by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a manner that oxygen atoms are not linked directly to one another, Z is OCH2 or CH2O, and m is 0 or 1.