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Temperature compensated balance wheel/hairspring oscillator

A hairspring and mechanical oscillation technology, applied to springs/shock absorbers, instruments, mechanically driven clocks, etc., can solve problems such as unbalanced balance wheels, inability to correct isochronous defects, and center of mass of hairsprings off-center.

Active Publication Date: 2007-06-20
CSEM CENT SUISSE DELECTRONIQUE & DE MICROTECHNIQUE SA RECH & DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is also complex and, just other more traditional methods, is not capable of correcting other isochronous defects, such as, because of, for example, various frictional effects on the oscillator, unbalance of the balance wheel, center of mass of the hairspring off-centre, etc. resulting defect

Method used

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  • Temperature compensated balance wheel/hairspring oscillator
  • Temperature compensated balance wheel/hairspring oscillator
  • Temperature compensated balance wheel/hairspring oscillator

Examples

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Embodiment Construction

[0039] [37] As indicated above, the thermal behavior of a quartz hairspring depends essentially on the slice of the plate on which it is manufactured. In this way, for a ZY / φ / θ double-rotating slice, as shown in Figure 1, the first-level thermal conductivity α, the second-level thermal conductivity β, and the third-level thermal conductivity γ of the rigidity of the hairspring are shown in Fig. In 2.a to 2.c, the temperature is 25°C. The vertical axis indicates α, β and γ respectively in ppm / ℃, ppb / ℃ 2 and ppt / °C 3represented value. Figures 3.a to 3.c show the horizontal lines of the graph in Figure 2 . Considering in particular Figure 3.a, which concerns the first thermal conductivity α, it should be noted that the value of the latter is practically independent of the angle φ, but varies with the angle θ. Since, moreover, the contribution of the second and third order thermal conductivity proves to be negligible, it follows that a single rotation slice, such as an X / θ sli...

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Abstract

The invention relates to mechanical watch oscillators comprising an assembly consisting of a spiral and a temperature compensated balance. Said spiral is embodied in a quartz substrate whose section is selected in such a way that the drifts of the spiral and of the balance associated therewith are thermally compensated. The substrate section can be embodied in the form of a section of single or double rotation. Said invention is used for horology.

Description

technical field [0001] [01] The present invention relates generally to mechanical oscillators and in particular to mechanical oscillators for watches comprising a temperature compensating assembly formed by a hairspring (thin spring) and a balance wheel. Background technique [0002] [02] The clock's mechanical oscillator, also called a governor, consists of a flywheel called a balance wheel and a helical spring called a balance spring, which is fixed on the one hand to the balance shaft (staff ), and on the other hand, is fixed to a pawl bridge on which the balance shaft of the balance wheel pivots. The balance wheel / hairspring oscillates around its equilibrium position at a frequency that must be kept as constant as possible because it determines the movement of the clock. For a homogeneous and uniform hairspring, the period of oscillation of this oscillator is given by the expression: [0003] T = 2 π ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16F1/10G04B17/06
CPCG04B17/066
Inventor C·布儒瓦
Owner CSEM CENT SUISSE DELECTRONIQUE & DE MICROTECHNIQUE SA RECH & DEV
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