Ebauches S.a.

Eta Sa Fabriques D'ebauches

Remy Grandjean

Ali Schneiter

Pierre Hersberger

Yves Guerin

Jacques Ziegler

The invention concerns a method for controlling a bidirectional stepping motor having two windings and three pole faces. The invention comprises applying current pulses alternately to only one of the motor windings to cause it to rotate in one direction and to only the other of the motor windings to cause it to rotate in the other direction. The invention is used for controlling bidirectional motors which are employed in particular in timepieces.

Method and device for controlling a bidirectional stepping motor

A touch sensitive device for controlling a function of a timepiece is formed with a condenser having a capacity independent of the area of the device touched. A conductive stem is fixed in a timepiece case and is electrically insulated from the case by a mounting member. A head is fixed on an end of the stem adjacent the outside of the timepiece to form one of the condenser electrodes. A thin layer of insulating material covers the outside of the head and forms the condenser dielectric. A layer of conductive material is fixed on a side of the dielectric material opposite the head and forms the second condenser electrode. When the second electrode is energized by the touch of the user, the entire second electrode is energized independent of the area touched by the user, giving the condenser a capacity independent of the area of the second electrode touched.

Touch sensitive device for a timepiece

A control device for controlling the display of an electronic watch capable of providing two different types of information. The control device enables selection of the information to be displayed and differentiation between the two types of display available.

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Fontainemelon, Switzerland

Remy Grandjean