PROBLEM TO BE SOLVED: To provide a push button switch which enables communication with a portable device even if a coil antenna having a coil conductor wound around a magnetic material core is attached to a lower surface of a wiring board.SOLUTION: A push button switch 100 for an immobilizer system includes a wiring board 3, in which an electronic component 8 is mounted on one surface, and electric power is supplied to a portable device from the one surface of the wiring board 3. A coil antenna 1 composed of a magnetic material core 1b and a coil conductor 1a wound around the magnetic material core 1b is attached to the other surface of the wiring board 3. The wiring board 3 has a wiring layer on its inner layer. A conductor pattern 5 is formed in the wiring layer on the inner layer so as to enclose the coil conductor 1a when viewed in a plan view. A direction of a current flowing through the coil conductor 1a is set to the same direction as a current flowing through the conductor pattern 5.
【課題】磁性体コアに回巻されたコイル導体を有するコイルアンテナを配線基板の下面に取り付けた場合においても、携帯機との間の通信が可能な押ボタンスイッチを提供する。【解決手段】一方の面に電子部品8が実装された配線基板3を有し、配線基板3の一方の面側から携帯機に電力を供給するイモビライザーシステム用の押ボタンスイッチ100であって、配線基板3の他方の面には、磁性体コア1bと磁性体コア1bに巻回されたコイル導体1aとからなるコイルアンテナ1が取り付けられ、配線基板3がその内層にも配線層を有し、内層における配線層に平面視コイル導体1aを取り囲むように導体パターン5を形成させ、コイル導体1aに流れる電流の方向と導体パターン5に流れる電流の方向とを同一方向とした。【選択図】図6
PUSH BUTTON SWITCH
押ボタンスイッチ
2015-08-03
Patent
Electronic Resource
Japanese