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Temperature-compensate-type hair-spring balance wheel, movement, and timepiece

A technology of hairspring balance wheel and temperature compensation, which is used in clocks, clocks, mechanically driven clocks, and frequency-stabilizing mechanisms to achieve excellent temperature compensation performance.

Active Publication Date: 2018-08-07
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, in the conventional balance with hairspring including a bimetallic piece, the temperature coefficient (inclination of the temperature characteristic) of the moment of inertia I can only be adjusted to either positive or negative.

Method used

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  • Temperature-compensate-type hair-spring balance wheel, movement, and timepiece
  • Temperature-compensate-type hair-spring balance wheel, movement, and timepiece
  • Temperature-compensate-type hair-spring balance wheel, movement, and timepiece

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0079] [clock]

[0080] figure 1 It is an external view of the clock 1. In addition, in each of the figures shown below, in order to make the drawings easier to see, the illustration of some of the timepiece components is omitted, and each of the timepiece components is shown in simplified form.

[0081] Such as figure 1 As shown, the timepiece 1 of this embodiment is constituted by incorporating the movement 2 or the dial 3 , various hands 4 to 6 , etc. into the timepiece case 7 .

[0082] The timepiece case 7 includes a case body 11 , a case cover (not shown), and a cover glass 12 . 3 o'clock position on the side of the housing main body 11 ( figure 1 The right side of ) is provided with crown 15. The crown 15 is used to operate the movement 2 from the outside of the case main body 11 . The crown 15 is fixed to an arbor 19 , and the arbor 19 is inserted into the case main body 11 .

[0083] [movement]

[0084] figure 2 It is a plan view of the movement 2 viewed fro...

no. 2 Embodiment approach

[0156] Next, a second embodiment of the present invention will be described. Figure 16 It is a perspective view of the balance with hairspring 201 of the second embodiment. This embodiment differs from the above-described embodiment in that the support portion 202 protrudes from the rim portion 73 in the first axis direction. In the following description, the same components as those in the above-mentioned embodiment are denoted by the same reference numerals and descriptions thereof are omitted.

[0157] exist Figure 16 In the illustrated balance with hairspring 201 , support portions 202 are formed at rotationally symmetrical positions of the rim portion 73 . The support portion 202 protrudes from the rim portion 73 toward the back side in the first axial direction, and protrudes inward in the first radial direction. A mounting hole 205 penetrating through the support portion 202 in the second axial direction is formed in a portion of the support portion 202 protruding ...

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PUM

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Abstract

The invention provides a temperature-compensate-type hair-spring balance wheel, a movement, and a timepiece. The hair-spring balance wheel is provided with: a hair-spring balance wheel body, which hasa swing shaft (61) extending along a first axis (O1) and rotating around the first axis (O1) by means of power from a balance spring (63); and an adjusting unit (100), which extends along a second axis (O2) at a position which is rotationally symmetric to the first axis (O1) on the hair-spring balance wheel body and is configured to adjust the position around the second axis (O2); herein, the adjusting unit includes double metal sheets (121), which are formed by stacking materials having different thermo-expansion rates in a direction being crossed to the second axis (O2).

Description

technical field [0001] The invention relates to a temperature-compensated balance with hairspring, a movement and a timepiece. Background technique [0002] A balance with hairspring that functions as a governor of a mechanical timepiece includes: a balance shaft extending along an axis; a balance wheel fixed to the balance shaft; and a hairspring. The balance shaft and the balance wheel periodically rotate (vibrate) forward and backward around the axis as the balance spring expands and contracts. [0003] For the above-mentioned balance with hairspring, it is important to set the vibration period within a predetermined value. If the vibration period deviates from the specified value, the rate of the mechanical timepiece (the speed of the timepiece) will change. [0004] The vibration period T of the balance with hairspring is expressed by the following equation (1). In formula (1), I represents the "moment of inertia" of the balance with hairspring, and K represents the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G04B17/06G04B17/22
CPCG04B17/222G04B17/06
Inventor 中岛正洋川内谷卓磨幸田雅行藤枝久
Owner SEIKO INSTR INC
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