公开(公告)号：US09903049B2

公开(公告)日：2018-02-27

申请号：US15045159

申请日：2016-02-16

Applicant: Master Dynamic Limited

Inventor： Ho Ching ,  Pui Hang Ko

IPC: G04B17/22 ,  C30B29/06 ,  G04B17/06 ,  C30B33/12 ,  G04B1/14

CPC classification number: C30B29/06 ,  C30B33/12 ,  G04B1/145 ,  G04B17/066 ,  G04B17/227

Abstract: A torque-restoring element for an oscillator for a mechanical timepiece and having an oscillator frequency, said torque restoring element comprising a spiral spring body having a number N turnings with an inner terminal end for engagement with a rotational inertial element via a collet, and an outer terminal for engagement with a stationary cock element, and having a width, a height and a total arc length; wherein the spiral spring body includes a core formed from mono-crystalline silicon wafer oriented along the crystallographic axis ; and wherein the spiral spring body includes at least one peripheral coating of a material having a thermal elastic constant different from that of the core of the spiral spring body so as to maintain the oscillator frequency an oscillator including the torque-restoring element substantially insensitive to variations of ambient temperature.

公开(公告)号：US09658598B2

公开(公告)日：2017-05-23

申请号：US13944554

申请日：2013-07-17

Applicant: Master Dynamic Limited

Inventor： Ho Ching

IPC: G04B17/06

CPC classification number: G04B17/066 ,  G04B17/06 ,  Y10T29/49581

Abstract: A method of increasing concentricity in use of a spiral hairspring mechanical timepiece; the hairspring having an inner terminal end portion for engagement with a collet, an outer terminal end portion for engagement with a stud, a first limb portion extending from the inner terminal end portion towards the outer terminal end portion, and a stiffening portion positioned at the outer turn of the hairspring and having a cross-sectional second moment of area different to that of the first limb portion such that bending stiffness of the stiffening portion has a greater bending stiffness than the single limb portion. The method includes modifying cross-sectional second moments of an area of the first limb portion and the stiffening portion by minimizing a cost function throughout the amplitude of the rotation of hairspring in use, the cost function being correlated to the net concentricity of the hairspring.

公开(公告)号：US10475355B2

公开(公告)日：2019-11-12

申请号：US14286306

申请日：2014-05-23

Applicant: Master Dynamic Limited

Inventor： Koon Chung Hui ,  Wing Chi Tang ,  Ho Ching

IPC: G09F3/00 ,  A44C17/00 ,  B41M5/24 ,  G02B5/18 ,  B23K26/00 ,  B23K26/352 ,  G01J1/08 ,  G09F23/00 ,  G01N21/87 ,  B23K103/00

Abstract: An identifiable mark on a portion of a polished facet of a surface of an article and being identifiable by an optical magnifying viewing device, the identifiable mark comprising a nano-structure formed by a two-dimensional or a three-dimensional lattice of a plurality of discrete nanometer sized recessed or protruded entities, wherein the entities are arranged within a predefined region of the polished facet in a predetermined arrangement in relation to each other. The predetermined arrangement of the entities is non-uniform and non-periodic arrangement, and wherein the entities are sized and shaped so as to cause optical scattering upon reflection of incident light having one or more predetermined wavelengths by the lattice at a predetermined angle of incidence to the lattice and the distance from the inner interface surface to the outer interface surface is greater than the amplitude of the non-marked portion of the polished face.

公开(公告)号：US09411312B2

公开(公告)日：2016-08-09

申请号：US14444918

申请日：2014-07-28

Applicant: Master Dynamic Limited

Inventor： Ying Nan Wang ,  Ho Ching

IPC: G04B17/06 ,  G04B17/32 ,  G04D3/00

CPC classification number: G04B17/066 ,  G04B17/32 ,  G04B17/325 ,  G04D3/0041 ,  Y10T29/49579

Abstract: A method of producing unitary formed silicon balance spring having an overcoil portion for regulation of a mechanical timepiece, said method including the steps of providing a silicon balance spring having a main body portion, and an outer portion for formation as an overcoil portion, wherein the outer portion extends radially outward from an outermost turn of the main body portion, and wherein said main body portion and said outer portion are integrally formed from a silicon based material and are formed in a co-planar configuration; moving said outer portion in a direction relative to and out of the plane of said main body portion, and in a direction towards over said main body portion and towards the plane of the main body portion; and providing a stress relaxation process to the balance spring so as to relieve internal stresses induced within the balance spring from step (ii); wherein upon movement of said outer portion into the plane of said main body portion, the outer portion is located in an overcoil configuration relative to said main body portion.

Abstract translation: 一种制造具有用于调节机械钟表的上线圈部分的单一成形硅平衡弹簧的方法，所述方法包括以下步骤：提供具有主体部分的硅平衡弹簧和用于形成外壳线圈部分的外部部分，其中， 外部部分从主体部分的最外圈径向向外延伸，并且其中所述主体部分和所述外部部分由硅基材料一体地形成并且形成为共面构造; 在相对于所述主体部分的平面的方向上移动所述外部部分，并沿着朝向所述主体部分的方向朝向主体部分的平面移动; 以及向所述平衡弹簧提供应力松弛过程，以便缓解来自步骤（ii）的所述平衡弹簧内引起的内部应力; 其中，当所述外部部分移动到所述主体部分的平面中时，所述外部部分相对于所述主体部分位于线圈结构中。

公开(公告)号：US08882341B2

公开(公告)日：2014-11-11

申请号：US14154055

申请日：2014-01-13

Applicant: Master Dynamic Limited

Inventor： Siu Kay Chu ,  Ho Ching ,  Pui Hang Ko

IPC: G04B17/04 ,  G04B17/34

CPC classification number: G04B17/345

Abstract: A hairspring collet for a hairspring for interference engagement and an interference fit with the cylindrical outer surface of the staff of a balance wheel for a timepiece movement, the hairspring collet portion comprising a plurality of circumferentially extending elastically deformable interconnected arm portions, the arm portions forming an annulus having a central axis and providing an aperture therebetween, wherein each arm portion including a curved concave engagement portion for engagement with the outer surface of a staff of a balance wheel, wherein each engagement portion has substantially the same radius of curvature as each other and are equally spaced from the central axis at a first distance and wherein the first distance is less than the radius of the staff of the balance wheel; the engagement portions have a radius of curvature such that upon deformation of the arm portions and engagement with the outer surface of the staff the engagement portions substantially conform with the outer surface of the staff and an interference fit is formed therebetween, wherein stress induced from said interference fit is transferred and distributed from along the engagement portions to the arm portions adjacent the engagement portions and distributed therein; and wherein the interference fit of the engagement portions with the staff substantially prevents relative movement between the hairspring collet and the staff of the balance wheel upon application of load from a hairspring in use in a timepiece movement.

Abstract translation: 用于干涉接合的游丝的游丝夹头和与用于钟表运动的摆轮的工作人员的圆柱形外表面的过盈配合，游丝夹头部分包括多个周向延伸的可弹性变形的互连臂部分，臂部形成 具有中心轴线并在其间提供孔的环形空间，其中每个臂部分包括用于与摆轮的工作人员的外表面接合的弯曲凹形接合部分，其中每个接合部分具有彼此基本相同的曲率半径 并且在第一距离处与中心轴线等距地间隔开，并且其中第一距离小于摆轮的工作人员的半径; 接合部分具有曲率半径，使得当臂部分变形并且与工作人员的外表面接合时，接合部分基本上与工作人员的外表面一致，并且在它们之间形成过盈配合，其中由所述 过盈配合从接合部分转移并分配到邻近接合部分的臂部分并分布在其中; 并且其中，当在手表运动中施加来自使用中的游丝的负载时，接合部分与工作人员的过盈配合基本上防止了游丝夹头和摆轮的工作人员之间的相对运动。