Accelerometer with reduced extraneous vibrations owing to improved electrode shape

An accelerometer with moveable mass (5) and fixed part (2) using variations in capacitance (3, 4) to detect the movement of the mass (5), in which a first series of electrodes (4) solidly connected to the mass (5) is interdigitated with a series of electrodes (3, 7) solidly connected to the fixed part (2), each moveable electrode (4) forming, together with an adjacent fixed electrode (3), a variable capacitance varying as a function of the position of the moveable mass (5), the accelerometer furthermore comprising an electronic circuit that detects the variation in at least one capacitance between moveable mass (5) and fixed part (2), said electronic circuit acting as an indicator of the displacement of the moveable mass characterized in that at least one electrode (3, 4) of the moveable mass (5) and/or of the fixed part (2) each exhibit a finger shape with a wide base and with a profile narrowing in the direction of their free end, and the electronic circuit generates a repetitive electrostatic restoring force and in that the repetitive electrostatic force is specifically chosen so that a mechanical power frequency spectrum (10, 201) of said repetitive electrostatic force exhibits a zone with substantially zero power at a mechanical resonant frequency of the electrodes (4) of the moveable mass (5) and/or of the fixed part (2).