Abstract: A loop antenna device has a first antenna generating a first magnetic field and a second antenna generating a second magnetic field such that the first magnetic field and the second magnetic field each have a different axis. A series resonant circuit and a parallel resonant circuit are provided for the first antenna and the second antenna, respectively. The series resonant circuit has at least a second coil, a link coil wound around a ferrite core, and a capacitor in series. The parallel resonant circuit has a first coil and a capacitor. When one of the first and second antennas are disposed in the vicinity of a conductor, an electromagnetic wave absorbing member is disposed between a conductor and one of the first and second antennas.

Abstract: A control method for a door lock device performs an unlocking operation of a lock mechanism of a vehicle door by energizing and actuating an actuator in response to an unlocking command from a vehicle user. The method has: a first time period (T1) for energizing the actuator in accordance with the unlocking command by the user; a second time period (T2) for returning an operation portion provided on a vehicle from an operated position to a normal position; and a third time period (T3) during which the actuator starts the unlocking operation and complete the unlocking of the lock mechanism. The first time period is determined to be equal to or longer than a sum of the second time period and the third time period.

Abstract: A human body detecting device for detecting an approach of a human body includes a sensor electrode provided in a housing and having detecting portions for detecting the approach of the human body to the housing. The detecting portions of the sensor electrode detect at least two different surfaces of the housing, and each of the detecting portions is provided at each surface side in the housing.

Abstract: An antenna device includes a door handle provided inside of a vehicle door for opening the vehicle door, and an antenna provided inside of the door handle and generating a magnetic field component in a direction different from a perpendicular direction to an outer surface of the vehicle door.

Abstract: A sensor electrode which detects an approach of a person to a vehicle can be housed in a door handle body for vehicle and is prevented from giving an adverse influence to transmission signals outputted from a transmission antenna. Slits are formed in a bottom portion of the body. The sensor electrode covered with a resin mold is pushed into the inside of the slit.

Abstract: A bar antenna includes a single body ferromagnetic substance core, a bobbin which accommodates the core in a hollow space and has a plurality of coil windings, a case in which is positioned the core and the bobbin, and a potting material in the case and/or the bobbin. The potting material isolates the core from temperature changes, humidity changes and vibration.

Abstract: A vehicle door lock system has a lock mechanism for locking or unlocking the vehicle door. A control mechanism for controlling an operation of the lock mechanism includes first and second resonators. The first resonator resonates at a predetermined first value Q for transmitting a first signal to the outside of the vehicle. The second resonator is connected in series with the first resonator and resonates at a second value Q which is greater than the first value Q, and changing a resonant condition in accordance with a change of a capacitance. A single actuator is provided for actuating the first and second resonators. A switching mechanism is provided which utilizes the actuator for alternatively switching actuation between the first and the second resonators. The control mechanism controls the switching operation of the switching mechanism and the operation of the door lock mechanism in accordance with the resonant condition of the second resonator.

Abstract: A bar antenna includes a single body ferromagnetic substance core, a bobbin which accommodates the core in a hollow space and has a plurality of coil windings, a case in which is positioned the core and the bobbin, and a potting material in the case and/or the bobbin. The potting material isolates the core from temperature changes, humidity changes and vibration.

Abstract: In a human body detector, a wave-detection circuit for detecting waves of a resonance voltage is connected to a sensor resonance circuit that modifies a constant frequency voltage in accordance with a change in the capacitance of a sensor electrode. The wave-detection circuit is connected to a differentiator that acquires a changing rate by differentiating the wave-detection voltage with respect to time, and allows a voltage to pass if the changing rate of the voltage is greater than or equal to a predetermined value. The differentiator is connected to a high-pass filter that allows passage of a voltage whose changing rate is greater than or equal to a second predetermined value. The high-pass filter is connected to a comparator whose non-inversion input terminal is connected to a power source that applies thereto a reference voltage.

Abstract: A loop antenna device has a first antenna generating a first magnetic field and a second antenna generating a second magnetic field such that the first magnetic field and the second magnetic field each have a different axis. A series resonant circuit and a parallel resonant circuit are provided for the first antenna and the second antenna, respectively. The series resonant circuit has at least a second coil, a link coil wound around a ferrite core, and a capacitor in series. The parallel resonant circuit has a first coil and a capacitor. When one of the first and second antennas are disposed in the vicinity of a conductor, an electromagnetic wave absorbing member is disposed between a conductor and one of the first and second antennas.

Abstract: A loop antenna has a first antenna generating a first magnetic field and a second antenna generating a second magnetic field such that the first magnetic field and the second magnetic field each have a different axis. A serial resonant circuit and a parallel resonant circuit are provided for the first antenna and the second antenna, respectively. The serial resonant circuit has a ferrite member, a first coil wound around the ferrite member, a resonant capacitor, and a power source connected thereto in series. The in-series connection of the resonant capacitor and the power source are connected across the first coil. The parallel resonant circuit has a link coil wound around the ferrite member, a second coil connected to the link coil in series and wound around a member outside the ferrite member, and a resonant capacitor connected in parallel to the series connection of the second coil and the link coil.