Electron equipment

Abstract

A small electronic equipment with a vibration alarm has, as a drive source, a flat stator type bipolar stepping motor, which has a rotor having high durability, can be assembled easily, requires low power consumption, is started constantly stably, and can be rotated at a high speed. In this electronic equipment with the vibration alarm, a rotor ( ) is rotated by a rotary drive system including a drive pulse generating means ( ), a drive circuit ( ), a flat stator ( ), a counter electromotive voltage detection coil ( ), and a magnetic pole position detection means ( ), so that an eccentric weight ( ) fixed to the rotor is rotated, thereby generating vibration. The drive pulse generating means outputs a pulse signal for driving the stepping motor on the basis of an alarm signal output at alarm time. The drive circuit supplies a drive current to a drive coil ( ) on the basis of the pulse signal from the drive pulse generating means. The flat stator transmits the magnetomotive force generated in the drive coil to the rotor ( ). The counter electromotive voltage detection coil detects a counter electromotive voltage generated by rotation of the rotor. The magnetic pole position detection means detects the magnetic pole position of the rotor ( ), which is rotating, with respect to the flat stator ( ) on the basis of the counter electromotive voltage generated in the counter electromotive voltage detection coil, and outputs, to the drive pulse generating means, a detection signal for controlling the output timing of the pulse signal supplied from the drive pulse generating means ( ).