Abstract: The invention relates to a new membrane for a loudspeaker. The membrane comprises a central portion having a sound emitting surface and a back surface. The membrane further comprises a first edge directly adjacent to the central portion and surrounding the central portion. The membrane further comprises a second edge surrounding the first edge and an intermediate portion located between the first edge and the second edge, wherein the intermediate portion comprises at least one convex shaped section with regard to the sound emitting surface area of the central portion and at least one concave shaped section with regard to the sound emitting surface area of the central portion.

Abstract: The invention relates to a new membrane for a loudspeaker. The membrane comprises a cent-ral portion having a sound emitting surface and a back surface. The membrane further compri-ses a first edge directly adjacent to the central portion and surrounding the central portion. The membrane further comprises a second edge surrounding the first edge and an intermedi-ate portion located between the first edge and the second edge, wherein the intermediate por-tion comprises at least one convex shaped section with regard to the sound emitting surface area of the central portion and at least one concave shaped section with regard to the sound emitting surface area of the central portion.

Abstract: A method of thinning a multilayer laminate material used for a membrane stiffening plate is provided to obtain a membrane stiffening plate having a thickness less than currently known in the art. The method provides for a significant reduction in the thickness of a membrane stiffening plate and provides for a mechanism to tune the cut-off frequency of a loudspeaker on which the membrane stiffening plate is used.

Abstract: An electrodynamic transducer having a coil, a membrane, and a plate is disclosed, wherein the transducer is adapted to generate a sound pressure level in the human-audible acoustic range and the ultrasonic range so that the transducer may be used as a speaker and an ultrasonic proximity sensor. The transducer may be adapted to generate a sound pressure level above about 88 dB between 20 kHz and 70 kHz. The plate may include a structural rigidity increasing feature such as a domed portion or a population of ribs, which may increase the generated sound pressure level in the ultrasonic range. The transducer may also include a front resonator which may be used to further tune and/or increase the generated sound pressure level in the ultrasonic range.

Abstract: The present invention discloses a vibration membrane assembly for a speaker, a method for producing a vibration membrane assembly and a speaker. The assembly comprises a vibration membrane and a vibration membrane carrier ring.

Abstract: A method of thinning a multilayer laminate material used for a membrane stiffening plate is provided to obtain a membrane stiffening plate having a thickness less than currently known in the art. The method provides for a significant reduction in the thickness of a membrane stiffening plate and provides for a mechanism to tune the cut-off frequency of a loudspeaker on which the membrane stiffening plate is used.

Abstract: The present invention discloses a vibration membrane assembly for a speaker, a method for producing a vibration membrane assembly and a speaker. The assembly comprises a vibration membrane and a vibration membrane carrier ring.

Abstract: A membrane for an acoustic transducer may comprise a first layer comprising a first material, a second layer disposed on the first layer, the second layer comprising a second material that is different from the first material, and a third layer disposed on the second layer, the third layer comprising a third material that is different from the first material and the second material, the third layer configured to be coupled with a moveable coil. The first material may be a polyaryletherketone (PAEK), the second material may be acrylate, and the third material may be polyetherimide (PEI), polycarbonate (PC), or another similar material.