Csem Centre Suisse D'electronique Et De Microtechnique Sa

Centre Electronique Horloger S. A.

André Perret

Raymond Vuilleumier

Claude Bourgeois

Arnold Christiaan Hoogerwerf

The invention relates mainly to a hairspring intended to equip the balance wheel of a mechanical timepiece. It is in the form of a spiraled rod () cut from an {001} single-crystal silicon plate. Its structure and its dimensions are calculated so as to minimize the thermal drift of the hairspring/balance-wheel assembly by means of the first and second thermal coefficients of its spring constant.

Watch hairspring and method for making same

A method for manufacturing a device with micro-shutters, e.g., a light modulating device, includes the following steps: producing a first grid presenting cells; providing a plane support by depositing a layer of organic material on the grid filling the cells; producing a second grid on the layer of organic material; depositing a fine metallic layer on the second grid; cutting shutters and shutter attachments in the fine metallic layer; and removing the organic material layer in the cells to free the shutters.

Growing community of inventors

Les Geneveys-sur-Coffrane, Switzerland

André Perret