Watch hairspring and method for making same

Details Watch hairspring and method for making same Watch hairspring and method for making same

2006-07-18

2006-07-18

Miska, Vit. W. (Department: 2841)

Horology: time measuring systems or devices

Oscillating or reciprocating means

Balance wheel type

C267S166000

Reexamination Certificate

active

07077562

ABSTRACT:
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 (10) 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.

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