• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a single piece spiral (1) comprising a single blade (3) wound on itself between an inner turn (SI) and an outer turn (SE), the blade (3) comprising a geometry allowing the spiral, when in contraction at a value of 360 degrees, has a constant distance between each turn of the inner coil to the penultimate coil (SP)
    公开号:CH711675A2
    申请号:CH01542/15
    申请日:2015-10-22
    公开日:2017-04-28
    发明作者:Helfer Jean-Luc；Cosandier Yves-Alain
    申请人:Eta Sa Mft Horlogère Suisse；
    IPC主号:
    专利说明:

    Description
    FIELD OF THE INVENTION [0001] The invention relates to a spiral with reduced overall dimensions and, more particularly, such a spiral intended to cooperate with a balance to form a resonator.
    BACKGROUND OF THE INVENTION [0002] The price of a silicon balance spring is substantially proportional to its surface, ie the more it is possible to engrave spirals on the same wafer, the lower the price of a spiral to the 'unit.
    It is however not possible to reduce the clutter at random because the turns of a spiral must not be touching as well in contraction and expansion. SUMMARY OF THE INVENTION [0004] The object of the present invention is to overcome all or part of the aforementioned drawbacks by proposing a reduced bulk spiral while ensuring that its turns do not touch as well in contraction as in expansion.
    For this purpose, the invention relates to a monobloc spring comprising a single blade wound on itself between an inner coil and an outer coil, the blade at rest comprising between the end of the inner coil and the second turn, a first zone in which the pitch decreases, a second zone, in extension of the first zone, in which the pitch between each turn increases continuously so that the spiral, when it is in contraction at a value of 360 degrees, has a constant distance between each turn of the inner turn to the penultimate turn.
    Advantageously according to the invention, it is understood that the bulk of the spiral is reduced to the maximum while ensuring a minimum constant distance between the contraction turns and, optionally, also expanding. We can therefore try to minimize the size of the hairspring, without losing in chronometric properties. Such a spiral optimizes the number of spirals that will be engraved on the same plate to reduce the unit cost.
    According to other advantageous variants of the invention: in the second zone, the pitch between each turn increases continuously according to a constant value; the second zone comprises a constant section; the first zone comprises a section which decreases between the end of the inner coil and its junction with the second zone; - The spiral has a third zone, an extension of the second zone and between the beginning of the penultième turn and the end of the outer turn, in which the pitch increases continuously so that the spiral, when expanding to a value of 360 degrees, has a minimum distance between the penultimate turn and the outer turn to avoid contact; in the third zone, the pitch increases continuously according to a constant value; - The third zone comprises a first portion whose section is substantially identical to that of the second zone and a second portion, an extension of the first portion, the section increases in approaching the end of the outer coil; the spiral is based on silicon; In addition, the invention relates to a resonator characterized in that it comprises a balance cooperating with a hairspring according to one of the preceding variants.
    BRIEF DESCRIPTION OF THE DRAWINGS [0009] Other features and advantages will clearly be described in the following description, by way of indication and in no way limitative, with reference to the accompanying drawings, in which: FIG. 1 is a top view in contraction of a hairspring according to the invention; fig. 2 is a top view at rest of a hairspring according to the invention; fig. 3 is an expanding top view of a hairspring according to the invention; fig. 4 is a graph showing the evolution of the pitch between the turns as a function of the number of turns of the spiral; fig. 5 is a graph showing the evolution of the thickness of the turns as a function of the number of turns of the spiral; fig. 6 is a graph showing the evolution of the distance between turns as a function of the number of turns of the spiral and the movement of the spiral.
    DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [0010] The invention relates to a reduced bulk spiral intended to cooperate with a balance to form a resonator-type of balance-balance for a timepiece.
    The development of the present invention was initiated to manufacture a maximum of spirals on the same silicon-based wafer while ensuring that the turns of each spiral do not touch as well in contraction as expansion. However, it is understood that the spiral can not be limited to a silicon-based material. Without limitation, it is understood that the same logic is applicable to a spiral formed from a LIGA process, that is to say based on an electrically conductive material.
    The terms based on silicon mean a material comprising monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica, silicon nitride or silicon carbide. Of course, when the silicon-based material is in crystalline phase, any crystalline orientation can be used.
    As illustrated in FIG. 2, the invention thus relates to a spiral 1 monobloc having a single blade 3 wound on itself between an inner coil Si and an outer turn SE. According to the invention, the blade 3 of the hairspring 1, in its rest position of FIG. 2, comprises between the end 5 of the inner coil Si and the second turn S2, a first zone A in which the pitch between the inner coil Si and the second turn S2 decreases.
    Advantageously, the hairspring 1 comprises, as an extension of the first zone A, a second zone B, in which the pitch between each turn increases continuously so that the hairspring 1, when it is in contraction, is that is, when the end 5 of the inner coil Si has rotated substantially at -360 degrees to the center of the hairspring 1, as seen in FIG. 1, has a substantially constant distance between each turn of the inner turn Si at the penultimate turn SP.
    [0015] Preferably, as illustrated in FIG. 4, the pitch between each turn increases continuously according to a constant value in the second zone B. In addition, preferably according to the invention, the second zone B has a constant section. Thus, by way of example, the constant section may comprise a constant thickness of between 10 and 50 μm and a constant height of between 50 μm and 250 μm.
    According to an additional optional feature, the spiral comprises, advantageously according to the invention, a third zone C, extending from the second zone B and between the beginning of the penultimate turn SP and the end 7 of the outer coil. SE, in which the pitch, between the penultimate turn SP and the outer turn SE, increases continuously so that the hairspring 1, when expanding, that is to say when the end 5 of the inner turn Si has rotated substantially +360 degrees from the center of the hairspring 1, as shown in FIG. 3, has a minimal distance between the penultième a turn SP and the external turn SE to avoid the contact in particular between the penultième a turn SP and the external turn SE.
    [0017] Preferably, as illustrated in FIG. 4, the pitch between each turn increases continuously according to a second constant value in the third zone C. As shown in FIG. 4, the second constant value is preferably greater than the first constant value of the second zone B. In addition, preferably according to the invention, the third zone C comprises a first portion C1 with a thickness substantially identical to that of the second zone B then a second part C2 in which the thickness increases continuously.
    A first graph showing the evolution of the pitch between the turns as a function of the number of turns of the spiral is illustrated in FIG. 4. It can be seen that in the first zone A of the hairspring 1, the pitch decreases substantially substantially until the beginning of the second zone B. In FIG. 4, it can be seen that the second zone B comprises a constant increase of the pitch to the third zone C. The latter C comprises a constant increase of the pitch to the end 7 of the outer turn SE. As shown in fig. 4, the constant increase of the pitch of the third zone C is much more pronounced than that of the zone B.
    In a complementary manner, a second graph showing the change in the thickness of the turns as a function of the number of turns of the spiral is illustrated in FIG. 5. It can be seen that in the first zone A of the hairspring 1, the thickness decreases to the beginning of the second zone B. In FIG. 5, it can be seen that the second zone B has a constant thickness up to the third zone C. The latter zone C comprises a first part Ο whose thickness remains constant and a second part C2, an extension of the first part C · ,, whose thickness increases as it approaches the end 7 of the outer turn SE.
    Finally, a graph showing the evolution ΔΡ of the distance between turns as a function of the number of turns of the spiral is illustrated in FIG. 6. More precisely, the spacing ΔΡ of the turns is illustrated for the hairspring in its contracted state of FIG. 1 (curve annotated in square P), in its rest state of FIG. 2 (triangle annotated curve Δ) and, in its expanded state of FIG. 3 (annotated curve in circle O).
    Therefore, in the state of expansion annotated in a circle (O), it can be seen that, in the first zone A of the spiral 1, the distance ΔΡ between the turns decreases to the beginning of the second zone B. It will be noted, then, that the second and third zones B and C comprise a distance ΔΡ between the turns which increases continuously until the fixed point of pitting of the end 7 reduces the distance between the turns to a minimum value .
    权利要求:
    Claims (9)
    [1]
    1. Spiral (1) monobloc comprising a single blade (3) wound on itself between an inner turn (Si) and an outer turn (SE), the blade (3) resting between the end of the inner turn (Si) and the second turn (S2), a first zone (A) in which the pitch decreases, a second zone (B), in extension of the first zone (A), in which the pitch between each turn increases continuously in order to that the hairspring (1), when in contraction at a value of 360 degrees, has a constant distance between each turn of the inner turn (Si) to the penultimate turn (SP).
    [2]
    2. Spiral (1) according to the preceding claim, characterized in that, in the second zone (B), the pitch between each turn increases continuously in a constant value.
    [3]
    3. Spiral (1) according to claim 1 or 2, characterized in that the second zone (B) has a constant section.
    [4]
    4. Spiral (1) according to one of the preceding claims, characterized in that the first zone (A) comprises a section which decreases between the end (5) of the inner coil (Si) and its junction with the second zone (B).
    [5]
    5. Spiral (1) according to one of the preceding claims, characterized in that the spiral (1) comprises a third zone (C), an extension of the second zone (B) and between the beginning of the penultième turn ( Sp) and the end (7) of the outer coil (SE), in which the pitch increases continuously so that the spiral (1), when expanding to a value of 360 degrees, has a minimum distance between the penultimate spire (SP) and outer coil (SE) to avoid contact.
    [6]
    6. Spiral (1) according to the preceding claim, characterized in that, in the third zone (C), the pitch increases continuously according to a constant value.
    [7]
    7. Spiral (1) according to the preceding claim, characterized in that the third zone (C) comprises a first portion (C-ι) whose section is substantially identical to that of the second zone (B) and a second part ( C2), an extension of the first part (C-ι), the section increases in approaching the end (7) of the outer coil (SE).
    [8]
    8. Spiral (1) according to one of the preceding claims, characterized in that the spiral (1) is based on silicon.
    [9]
    9. Resonator characterized in that the resonator comprises a rocker cooperating with a hairspring (1) according to one of the preceding claims.
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    同族专利:
    公开号 | 公开日
    CH711675B1|2019-07-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2021-05-31| PL| Patent ceased|
    优先权:
    申请号 | 申请日 | 专利标题
    CH01542/15A|CH711675B1|2015-10-22|2015-10-22|Small space spiral with constant section.|CH01542/15A| CH711675B1|2015-10-22|2015-10-22|Small space spiral with constant section.|
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