Patent ID: 11860245
Assignee: MITSUMI ELECTRIC CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A magnetic detection device, comprising:
an amplifier circuit that amplifies a detection signal from a magnetic sensor that detects an AC magnetic field;
a timer circuit which is started in response to change in an output of the amplifier circuit and whose output changes when the timer circuit has counted a predetermined time;
a logic circuit to which the output of the timer circuit is input; and
an oscillation circuit that generates a clock signal for operation of the timer circuit,
wherein the timer circuit is reset when the output of the amplifier circuit changes in another direction before the timer circuit counts the predetermined time so that an AC magnetic field with a half cycle shorter than the predetermined time is prevented from changing an output of the logic circuit.