Abstract: The electronic pen comprises a lead equipped with a tip, an ink container and a three-dimensional force sensor for measuring the forces applied on the lead by a user. The three-dimensional force sensor, placed for example at a distance of less than 15 mm from the tip of the lead, comprises a sensitive detection element placed in the axis of the tip of the lead The pen comprises a first element made of flexible material arranged between the ink container and the three-dimensional force sensor to transmit the forces applied on the lead to the three-dimensional force sensor. The pen can comprise a second element made of flexible material for securing the ink container inside the lead.

Abstract: A connection system, particularly an electrical system, comprises inextensible wires to connect two elements, the wires being associated with an elastic support such that, when elastic deformation of the support occurs, wires remain fixed to the support. Therefore, the invention enables an elastic connection without shearing being caused between the support and the wires. Various embodiments and related manufacturing methods are described.

Abstract: A microdevice is provided for measuring the electromagnetic characteristics of a medium in a borehole. The microdevice includes at least one emitting or transmitting coil (31), and at least one receiving coil (41,51). The microdevice generates an A.C. voltage at the terminals of the transmitting coil and measures a signal at the terminals of the receiving coil. The microdevice also includes an E-shaped electrically insulating, soft magnetic material circuit serving as a support for each of the coils and which is positioned adjacent to the medium in the borehole.

Abstract: A physical quantity such as temperature, infrared radiation or smoke is detected by means of a conversion device for emitting an alarm signal whose amplitude is representative of the intensity of the physical quantity. The detector comprises a unit for measuring relative variations of the signal in time, for comparing them with a preset threshold level and for actuating the alarm when they exceed the threshold level.

Abstract: A physical quantity such as temperature, infrared radiation or smoke is detected by means of a conversion device for emitting an alarm signal whose amplitude is representative of the intensity of the physical quantity. The detector comprises a unit for measuring relative variations of the signal in time, for comparing them with a preset threshold level and for actuating the alarm when they exceed the threshold level.

Abstract: The connections between the two inputs of an amplifier and the two outputs of a signal source as well as between the outputs of the amplifier and the inputs of a downstream output element into which the amplifier delivers a signal are inverted periodically and simultaneously and integration is carried out between the outputs of the amplifier and the inputs of the output element. In addition, the inputs of the amplifier are short-circuited periodically, the frequencies of inversion and of short-circuiting being multiples of each other.