Disclosed is an electronic timepiece including: a first light detector and a second light detector that detect external light; a first mechanism that limits an amount of the external light detected by the first light detector; and a second mechanism that limits an amount of the external light detected by the second light detector and has a different structure from a structure of the first mechanism.

A device for measuring the humidity in the internal volume of a case of a watch, which device includes a watch including a case housing an optical system, the optical system including a transmitter transmitting a light beam, a multi-pass cell through which the light beam is intended to pass, and a receiver intended to receive the light beam once it has passed through the multi-pass cell; a management module external to the case, including a processing unit configured to communicate with the optical system and to process data transmitted thereby in order to determine the humidity present in the internal volume of the case on the basis of the absorption of the light beam by the water vapour that may be present in the internal volume of the case.

The invention relates to a method implemented by a computer terminal for assisting the setting of a mechanism of a mechanical timepiece (10). The method comprises the following steps: i) capturing an image or a sequence of images of the mechanical timepiece (10) by means of a computer equipment (20) comprising an image acquisition device (22) and a display area (24); determining the setting to be made according to said image or sequence of images, and displaying on the display area (24) of the computer device (20) a sequence of instructions for said setting of the mechanism.

Method of measuring at least one dimension (L) of an object (1) having a first axis (2), the method including the use of a first optical system (11) including an optical sensor (111) and having a second optical axis (113), the measuring method including (i) obtaining at least one series of data from the optical sensor when the object is in movement relative to the first optical system, notably an angular movement of the first axis relative to the second axis and/or a movement of the object in rotation about the first axis and/or a movement of the object in translation along the second axis and (ii) processing the at least one series of data to quantify said at least one dimension.

The invention relates to a spiral spring (100), suitable for use in an optical measuring method according to any one of the preceding claims, with several turns (110) which extend along respective circular paths forming a spiral course, wherein the spiral spring (100) can be stimulated to an oscillatory movement, in particular for clocking a mechanical movement, with adjacent turns (110) being deflected relative to each other along their respective circular paths by an angular displacement (), It is the object of the present invention to determine the oscillation behavior of spiral springs based on characteristic geometries, and, in particular, to provide a non-invasive, non-contact measuring method which can be used in automated assembly lines in line assembly in movement production. The object is achieved in that the spacing (x) between the adjacent turns (110) varies at least along a measuring section corresponding to the angular displacement ().

A portable modular unit for inspecting in a timepiece the presence of a lubricating agent, or of an epilame, having fluorescent markers, from an excitation luminous flux of white light. The modular unit includes an optical housing forming a first module, a portable white light source (200) emitting an excitation luminous flux forming a second module, and a portable magnifying device forming a third module. The optical housing includes a first mounting interface for removably mounting the portable white light source on the optical housing, the first mounting interface being configured so that the excitation luminous flux emitted by the portable white light source is directed in the direction of the excitation filter; and a second mounting interface for removably mounting the portable magnifying device on the optical housing, the second mounting interface being configured so that the magnifying device is opposite the inspection opening.

A dial (2a, 2b) of a watch (1) including a device (3) for determining the position of at least one hand (24a, 24b) of this watch (1), such a dial (2a, 2b) having a visible face (20a) and a hidden face (20b), the dial (2a, 2b) being formed by a stack (9a, 9b) of thin layers (10, 11, 12, 13, 14) of material extending between these two faces (20a, 20b), each of the layers (10, 11, 12, 13, 14) comprising one or more of the functional elements included in the determination device (3): at least one light-detecting element (23), at least a first light source (4a) and at least a second light source (4b), a stand-alone power supply unit (21) comprising a photovoltaic module (5), and a control unit (7) for managing the operation of each light source (4a, 4b) and of the at least one light-detecting element (23).

A device for measuring the humidity in the internal volume of a case of a watch, which device includes a watch including a case housing an optical system, the optical system including a transmitter transmitting a light beam, a multi-pass cell through which the light beam is intended to pass, and a receiver intended to receive the light beam once it has passed through the multi-pass cell; a management module external to the case, including a processing unit configured to communicate with the optical system and to process data transmitted thereby in order to determine the humidity present in the internal volume of the case on the basis of the absorption of the light beam by the water vapour that may be present in the internal volume of the case.