Electronic timepiece with analog display comprising a seconds in

Details Electronic timepiece with analog display comprising a seconds in Electronic timepiece with analog display comprising a seconds in

1986-09-09

1987-08-04

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368160, 368187, 318696, G04F 500, H02K 2904

Patent

active

046842624

ABSTRACT:
The timepiece comprises a first motor for driving a second hand and a second motor for driving minute and hour hands.
When the timepiece is operating normally, the first motor, which comprises at least two coils, is controlled continuously by variable voltages in such a way that its rotor is subjected to a rotating magnetic field and that the second hand moves forward by effecting at least five jumps per second. Furthermore, these voltages are preferably such that the rotor effects one revolution per minute, it therefore being possible to fix the second hand directly to the rotor shaft.
The second motor is a conventional, preferably bidirectional stepping motor.

REFERENCES:
patent: 3958167 (1976-05-01), Nakajima et al.
patent: 4371821 (1983-02-01), Laesser et al.
patent: 4433918 (1984-02-01), Nishimura et al.
patent: 4440502 (1984-04-01), Kanno
patent: 4471284 (1984-09-01), Guerin
patent: 4514676 (1985-04-01), Grandjean et al.
Bulletin Annuel de la Societe Suisse de Chronometrie, vol. 11, No. 1, 1982, pp. 147-151, Neuchatel, CH: R., Grandjean: "Moteurs Biphase pour Montre a Quartz"*Figures*.
Elektronik, vol. 29, No. 26, Dec. 1980, pp. 43-46, Munich, DE; H. Grugg et al.: "Schrittmotoren Optimal Angesteuert", p. 44, paragraphs 2,3; Figures*.
Elektronik, vol. 33, No. 1, Jan. 1983, pp. 37-39, Munich, DE, T. Wittchen: "Minischritt-Steuerung fur 2-Phasenschrittmotoren mit Geschalteten Stromreglern".

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