The present disclosure includes a case body configured to accommodate a movement, and a rotating bezel attached to the case body. The rotating bezel includes a bezel body having an annular shape, and a display plate detachably attached to the bezel body. An engagement protrusion protruding toward the bezel body and being continuous in a circumferential direction is provided at the display plate. A plastic gasket having an annular shape is disposed between the bezel body and the engagement protrusion. A first recessed portion is provided in an outer circumference of the display plate. A second recessed portion is provided in the engagement protrusion of the display plate so as to correspond to a position of the first recessed portion.

The invention concerns a timepiece member including a first axis and a first threading intended to cooperate with 5 a second threading provided on a second timepiece member. The first threading is configured so that a zone of contact between the first threading and the second threading extends over less than 50% of the height of the threads of the second threading or is configured so that the zone of contact between the first 10 threading and the second threading extends over less than 0.3 times the pitch of the threading.

Disclosed is a decorative object including an upper glass, a lower glass, a recessed pattern formed in the lower glass and facing the upper glass, a liquid filling the recessed pattern, the refractive index of the liquid being equal to that of the lower glass or differing from that of the lower glass by at most 10 %, and solid elements which can move in the liquid.

A method for cutting watch crystals along a plurality of contours in a plate of transparent material includes forming a first cut line or kerf to form a first chamfer for each of the crystals of the plate and marking at least one machined recess on a first side of the plate, turning the plate over and marking at least one of the position of the first chamfer and the position of the at least one machined recess, forming a second cut line or kerf to form a second chamfer for each of the crystals on a second side of the plate, and separating the crystals by machining through the plate at each of the contours to form edges of the crystals.

The invention concerns an apparatus including a crystal or a screen in which the crystal or the screen is arranged to ensure sealing and an anti-scratch protection of said apparatus which is intended to display an information visible to a user through the crystal or the screen. The apparatus includes a first material layer (1) made of an unbreakable transparent plastic polymer fastened on the apparatus in a tight manner, and a second material layer (2) made of a transparent glass, superimposed on the first layer (1) and constituting the outer portion of the crystal or the screen of the apparatus. The second material layer (2) made of a transparent glass includes, carried by its inner face, a transparent repositionable glue film (4), this repositionable glue film (4) ensuring the repositionable adherence of the second material layer (2) on the first material layer (1), whereas the second material layer (2) with its repositionable glue film (4) can be removed so as to be able to be replaced by another second material layer (2) provided with a transparent repositionable glue film (4), without breaking the sealing of said apparatus ensured by the first material layer (1) which remains permanently fastened on said apparatus.

A crystal/glass or screen of an apparatus intended to display an information visible to a user includes on its outer surface a transparent protective film with a convex outer surface, constituting a lens in order to facilitate reading. The transparent protective film constituting a lens is a layer (2) of transparent sapphire glass material having an anti-scratch surface. This layer (2) includes a convex outer surface forming a lens and an inner surface carrying a transparent repositionable glue film (4) by which said layer (2) can be removably glued to the outer surface of the crystal or of the screen (1).

A method for marking a product (1) with a photoluminescent mark, said mark comprising a photoluminescent portion (10) which is transparent under normal light conditions and revealed by photoluminescence under UV illumination, said mark further comprising a non photoluminescent portion (9) which is transparent under normal light conditions as well s under UV illumination, said method comprising: deposing on said product a stack, said stack comprising alternatively layers (2,4) such as AIN, with a thickness of less than 1 micron and layers (3) of a second material, such as GaN with a thickness of less than 10 nm; raising the transparency of said non photoluminescent portion (10) with a deposition of transparent material (6) or incorporation of ions into said non photoluminescent portions.

A method hardens an anti-reflection treatment deposited on a transparent substrate that includes a top surface and a bottom surface which extends remotely from the top surface. The anti-reflection treatment includes depositing at least one anti-reflection layer of at least one material on at least one of the top and bottom surfaces of the transparent substrate, bombarding the at least one top or bottom surface on which the at least one anti-reflection layer has been deposited using a singly-charged and/or multi-charged ion beam produced by a singly-charged and/or multi-charged ECR electron cyclotron resonance ion source. The method produces a transparent substrate having undergone an anti-reflection treatment such that at least one of the top and bottom surfaces of the transparent substrate is coated with at least one anti-reflection layer of at least one material, whereby ions are implanted in the at least one anti-reflection layer.

The invention relates to an anodic bonding method for bonding two elements with an intermediate layer. The invention especially, but not exclusively, relates to an anodic bonding method for between a metallic element and a heterogeneous element, for example a glass, artificial sapphire or ceramic element. The specificity and aim of the present invention is to produce an assembly that is gas-tight and fluid-tight, solderless, brazing- or welder-free and without organic compound (glue). The present method has multiple industrial applications, including making it possible to attach a watch-glass, typically made of mineral glass, sapphire or transparent or translucent ceramics, to a bezel or case middle of a watch case using the anodic bonding technique.

A method for marking a sapphire watch crystal, through the interaction between a laser beam and the sapphire. The beam is focused on a point inside the crystal and the interaction is such that it produces a rectilinear opaque area, which is parallel to the upper surface of the crystal or perpendicular to the surface. The orientation of the opaque area depends on the mode of operation applied. According to the hatching mode of operation, the beam is scanned along one or more linear paths, producing opaque lines inside the crystal, which are parallel to the upper surface. The perforation mode of operation produces distinct opaque areas, obtained by discontinuous operation of the beam on a number of juxtaposed points. According to this latter mode of operation, the opaque areas extend in the direction perpendicular to the upper surface of the crystal.