A collet elastically mounted on a staff whose geometry produces fewer internal stresses in particular on the contact points and the vertices of its polygonal shape.

A holding member for fixing a timepiece component on support elements of different cross section includes an opening into which each support element can be inserted, the holding member having structural elements together forming a body configured to ensure mounting of each support element in the opening. Each of the structural elements includes a first structural sub-element and a second structural sub-element, the first structural sub-element including a volume of material greater than a volume of material constituting the second structural sub-element. The holding member includes a connecting portion ensuring the mounting of each of the support elements in the holding member, the portion being defined on an inner face of the first structural sub-element.

A method for manufacturing a resonator in a substrate, including: a) modifying a structure of at least one region of the substrate to make the at least one region more selective; b) etching the at least one region to selectively manufacture the resonator.

Timepiece collet comprising a point of attachment to a balance spring and a passage intended to receive a balance staff. According to the invention, the passage is substantially cylindrical and is configured to deform elastically in a plane perpendicular to the axis of the passage and to elastically clamp the balance staff by at least two lines of contact extending over the height of the inner wall of the passage when the balance staff is inserted in the passage.

The invention relates to a one-piece balance spring comprising a single strip wound on itself between an inner coil and an outer coil, the strip having a geometry such that when the angle of contraction of the balance spring has a value of 360 degrees, there is a constant distance between each coil from the second coil to the penultimate coil.

A balance spring, in particular for a horological regulating member, the balance spring (100) including a flexible strip (2) wound about itself in several turns, the strip (2) having a predefined stiffness, the balance spring (100) having a stiffener for adjusting its stiffness, the balance spring (1) also including an actuator (10) for actuating the adjustment means, depending on the ambient temperature. Also, a horological regulating member including such a balance spring.

A method produces an assembly of an elastic holding member-timepiece component assembly with a support element. The elastic holding member is made of an electrically insulating material and the support element is made of an electrically conductive material. The method includes mounting the assembly with the support element aiming to define at least one zone for receiving at least one element for blocking a movement of the holding member relative to the support element, and producing by galvanic metal growth the at least one blocking element on at least one of the reception zones.

A balance includes a balance staff rotatably supported by a main plate, a collet fixed to the balance staff, and a hairspring fixed to the collet, the hairspring including a Grossmann curve disposed at a side of the collet and an Archimedes curve coupled to the Grossmann curve, and an impact-resistant member configured to suppress displacement of a shape of the Grossmann curve at least at the side of the collet.