Electronic watch with means for detecting the movement of a hand

Details Electronic watch with means for detecting the movement of a hand Electronic watch with means for detecting the movement of a hand

1982-12-15

1983-12-13

Truhe, J. V.

Horology: time measuring systems or devices

Chronological

With mechanical or electromechanical driven display

368157, 368187, G04C 300, G04C 900, G04B 2302

Patent

active

044202636

ABSTRACT:
For performing a very precise detection of the position of at least one hand, the watch is provided with an electro-optical detection device.
The detection device comprises a wheel 8 carrying a mirror 26. The wheel 8 is intermittently driven by the driving member 6 for defining n angular positions of the mirror 26. The member 6 is meshing with the gear train 12 of the watch. It further comprises a light emitter 30 and a light receiver 32 which receives a light beam when the mirror 26 is in an angular position corresponding to the reference position of the hand. The number n is inferior to the number of steps performed by the hand during a complete revolution of said hand.

REFERENCES:
patent: 4091612 (1978-05-01), Meisner et al.
patent: 4119892 (1978-10-01), Saito et al.
patent: 4253173 (1981-02-01), Jaunin
patent: 4276626 (1981-06-01), Satoh et al.
patent: 4352172 (1982-09-01), Ueda et al.

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