Abstract: There is provided an acoustic element (102) for placement in a sound path (120) of a loudspeaker device (100), the acoustic element (102) comprising a container (104) and an acoustic volume increasing material (106) located in the container (104). In an embodiment, the container (104) comprises wall portions with different physical characteristics. In other embodiments, the walls of the container (104) are made of the same material.

Abstract: A loudspeaker in which a magnetic particle filter is provided in the vicinity of a sound outlet port.

Abstract: In a method of and a device for producing a membrane (1) for an electroacoustic transducer, the procedure is such that a membrane (1), which has been produced for example by deep-drawing, is at least partially coated on at least one surface with a liquid plastic (7), in particular a plastic adhesive, and this liquid plastic is cured.

Abstract: An optical joystick uses a plate to provide the suspension of the cover. The plate is mounted by the ends of radially outer spring arms, so that the desired deflection is taken up by the spring arms and not a central plate member. The spring arms can be straight or curved, but they are generally arranged around the outer periphery of the central plate member, so that the central plate member is centrally and evenly supported.

Abstract: There is provided an acoustic element (102) for placement in a sound path (120) of a loudspeaker device (100), the acoustic element (102) comprising a container(104) and an acoustic volume increasing material(106) located in the container (104). In an embodiment, the container (104) comprises wall portions with different physical characteristics. In other embodiments, the walls of the container (104) are made of the same material.

Abstract: A moving system (3) for a piezoelectric speaker (1) may include a membrane (4) and a piezoelectric layer (5) attached thereto, wherein a movement of the moving system (3) in a main direction (MD) is substantially caused by dilatation/contraction of the piezoelectric layer (5) transverse to the main direction (MD). To provide an advantageous frequency response of the moving system (3), it is built up asymmetrically with respect to the moving characteristics. Accordingly, the modes are frequency shifted on the one hand and of less influence on the other. Hence, the frequency response of an inventive speaker (1) has less elevations and depressions in the frequency response. In a preferred embodiment the local compliance and/or the shape of the moving system (3) is asymmetric with respect to any point in the plane of the moving system (3).

Abstract: An acoustic transducer assembly with a basket for receiving and electrically contacting an acoustic transducer, the basket being configured to be mounted on, and electrically connected to, a platform, such as a printed circuit board, or a support or a housing. The basket may include electrical contact areas for electrically connecting the basket to the platform, and at least one mounting structure for cooperating with a platform-sided mounting structure to form a fixed mechanical connection with the platform. An electrical contact area of the basket may be integrally formed with the mounting structure of the basket.

Abstract: A loudspeaker comprises a voice coil and a diaphragm attached to the voice coil. The diaphragm has a generally rectangular outer shape, and comprises an outer rim (A1) having an outer edge at which the diaphragm is fixed in position and an inner section (A0) within the outer rim. The inner section (A0) comprises: an outermost area (A00) which is coupled to the voice coil and having the same generally rectangular outer shape; and an inner area (A01) comprising a periodic rib structure (A01p), with the ribs running parallel to the shorter side of the rectangular outer shape, and two lateral transition areas (A01c) between the edges of the periodic rib structure (A01p) and the shorter side edges of outermost area (A00).

Abstract: An electro-acoustic transducer (1) is disclosed, comprising a substrate (2) that comprises conducting paths (3), a cover (4) attached to said substrate (2) thus forming an inner chamber (A) and a space (B) outside said chamber (A), wherein said cover (4) comprises one or more ports (5). A MEMS sensor (6) of said transducer (1) has at least one hole (7) extending from a first side (C) to a second side (D). A membrane (8) is arranged in said hole (7) transverse to the hole axis (E) thus forming a first hole space (a) and a second hole space (b). The sensor (6) furthermore has electrical connectors (9) designed to carry electrical signals representing sound acting on said membrane (8), which connectors (9) are connected to said conducting paths (3). According to the invention, said MEMS sensor (6) is arranged inside said chamber (A) in such a way that said second hole space (b) is connected to said outside space (B) via said port or ports (5) and said first hole space (a) is connected to said inner chamber (A).

Abstract: An input device for an electronic device is disclosed comprising a source of light (2) emitting a light beam in a first direction, a reflecting member (4) for reflecting said light beam, means for allowing tilting of the reflecting member (4) around at least one axis transverse to said first direction, at least one detector (6, 7, 8, 9) detecting the reflected light beam and outputting an electric signal corresponding to light intensity of the detected light beam in a second direction, in which the light beam is reflected, and an electronic circuit deriving a position signal from the at least one electric signal. Said means for allowing tilting of the reflecting member (4) comprise a first bearing (12) having at least one convex surface and at least one concave surface cooperating with each other in a sliding relationship thus enabling said tilting of said reflecting member (4).

Abstract: A loudspeaker device (200) is presented which includes a zeolite material (100) comprising zeolite particles (102) having a silicon to aluminum mass ratio of at least 200. For an increased pore fraction of pores with a diameter in a range between 0.7 micrometer and 30 micrometer shows an increased shift of the resonance frequency down to lower frequencies has been observed.

Abstract: A membrane 103 for an acoustic device 100 is provided, the membrane 103, wherein the membrane 103 comprises a central portion 212, an annular portion 105, and a corrugation 107, wherein the annular portion 105 is arranged around the central portion 212, wherein the annular portion 105 is adapted to be fixed to a coil 106, and wherein the corrugation 107 is arranged between the central portion 212 and the annular portion 105. Thus, the corrugation 107 may form an inner corrugation compared to an outer corrugation 104 which would be arranged farther away from the central portion 212 than the annular portion 105.

Abstract: A microphone comprises a sound inlet, a first MEMS microphone structure comprising a first membrane and associated backplate in the path of the sound inlet and a second MEMS microphone structure comprising a second membrane and associated backplate stacked with respect to the first microphone membrane, with an enclosed space between the first and second membranes.

Abstract: A resilient suspension member for suspending a mass element of a vibration actuator. The suspension member is configured to extend elastically, providing a tensional restoring force, when the mass is displaced. The suspension member is formed of a silicone rubber.

Abstract: A method of determining the harmonic and anharmonic portions of a response signal (RS) of a device (2), e.g. an electro-acoustic or electric device, comprises the steps of supplying an input signal (IS) to the device (2) causing the device (2) to respond with a response signal (RS), wherein the input signal (IS) is a sinusoidal signal having a continuously increasing or decreasing frequency (f), capturing the response signal (RS), transforming the captured response signal (RS) from the time space into the phase space and analyzing the phase space transformed response signal (TRS) in respect of its harmonic and/or anharmonic portions or establishing reference functions when defining the input signal (IS) and analyzing the response signal (RS) by Fourier transformations carried out by numerical integrations of the reference functions.

Abstract: A microphone is disclosed in which a housing is formed by a cap (13) sealed to a substrate (11). A MEMS die (10) is mounted on the substrate (11), the MEMS die (10) incorporating a membrane (12). The membrane (12) has a first surface facing the substrate and in fluid communication with an acoustic inlet port (14) in the cap (13) via an acoustic path (17) and a second surface facing the inner surface of the cap, which second surface along with part of the inner surface of the cap (13) defines at least part of a sealed chamber (19) within which a volume of air is trapped.

Abstract: A laser system for the marking of metallic and non-metallic materials comprising a laser oscillator (1), characterized in that said laser oscillator (1) comprises: an active optical means (13) of the crystal laser type, a laser pump (10) to provide a pump energy to said active optical means (13); a mirror (14) disposed upstream said active optical means (13); an optical switch, apt to provide a pulsed laser beam, disposed downstream said active optical means (13); a mode adaptor (18) coupled to said optical switch (16); a predetermined length single-mode optical fibre (19), coupled to said mode adapter (18); a Bragg Grating type reflector coupled to said optical fibre (19).

Abstract: A compound membrane (100) for an acoustic device (200), the compound membrane (100) comprising a first layer (101) and a second layer (102), wherein a value of Young's modulus of the second layer (102) does not vary more than essentially 30% in a temperature range between essentially ?20° C. and essentially +85° C.

Abstract: An acoustic device (500), comprising an oscillatory membrane (501) which comprises a transducing element (503) and a frame (504) adapted for accommodating the membrane (501) in an accommodation plane, wherein the membrane (501) is accommodated in the frame (504) in such a manner that a translational motion of the membrane (501) in at least one direction of the accommodation plane is made possible.

Abstract: A microphone has a membrane (20) mounted to vibrate in response to pressure fluctuations, a backplate (30) facing the membrane and being more rigid than the membrane, and circuitry (95) for sensing the vibrations relative to the backplate, the backplate being prestressed and having a geometry such that a response of the backplate to structure borne vibration matches a corresponding response of the membrane. This can help reduce or minimize relative movement between these surfaces caused by structure borne vibration and hence improve the signal-to-noise ratio of the microphone. The geometry can be a hub and spoke arrangement.