Electronic equipment with vibration alarm

Details Electronic equipment with vibration alarm Electronic equipment with vibration alarm

1997-06-17

1999-03-02

Roskoski, Bernard

Horology: time measuring systems or devices

Displays or display device details

Dial or hand

368250, 368255, G04B 1906

Patent

active

058780041

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 (1) is rotated by a rotary drive system including a drive pulse generating means (112, 113, 114), a drive circuit (110), a flat stator (6), a counter electromotive voltage detection coil (306), and a magnetic pole position detection means (107, 115, 116), so that an eccentric weight (2) 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 (305) 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 (1). 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 (1), which is rotating, with respect to the flat stator (6) 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 (114).

REFERENCES:
patent: 4150536 (1979-04-01), Nakajima et al.
patent: 4208868 (1980-06-01), Regnier et al.
patent: 4637732 (1987-01-01), Jones et al.
patent: 4920525 (1990-04-01), Meister
patent: 5023853 (1991-06-01), Kawata et al.
patent: 5027025 (1991-06-01), Saneshige
patent: 5089998 (1992-02-01), Rund

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