ANTI-THEFT SYSTEM FOR ON-VEHICLE ELECTRONIC EQUIPMENT

摘要

PROBLEM TO BE SOLVED: To provide an anti-theft system having an excellent engine tachmeter 20. SOLUTION: A primary side coil 12 arranged in an instrument panel 40 is provided. The engine tachmeter 20 arranged on the instrument panel 40, having a secondary side coil 212 for receiving electric power from the primary side coil 12 by electromagnetic induction, and rotating and driving an indicator 25 based on the electric power received by the secondary side coil 212 is provided. When the engine tachmeter 20 is removed from the instrument panel 40, a dimension between the primary side coil 12 and the secondary side coil 212 becomes larger, and change of mutual impedance of the primary side coil 12 and the secondary side coil 212 is detected, a drive circuit gives an alarm sound from a speaker.