230results about "Diaphragm damping" patented technology

A diaphragm for acoustic converter includes a base and a damping layer formed on one surface or both surfaces of the base. The damping layer includes a particle having a heat dissipating function, and has detachability with respect to the base.

A display apparatus includes: a display panel configured to display an image; a housing module including a roller configured to have the display panel wound or unwound in the housing module; a rolling module including a structure connected to an upper portion of the display panel, and configured to wind or unwind the display panel according to a folding or unfolding of the structure; a plurality of beams on one surface of display panel that extends in a first direction, and arranged in a second direction vertical to the first direction; and a vibration generating device in a portion of each of the plurality of beams, wherein the vibration generating device includes a plurality of sound generating modules configured to vibrate the display panel when the display panel is unwound from the roller and the structure is unfolded.

An audio speaker having a suspension system including a surround to support a diaphragm within a frame and to reduce non-pistonic motion of the diaphragm at several resonant frequencies is disclosed. More particularly, embodiments of the surround include a film that undulates in a peripheral direction around the diaphragm and includes several undulations above and below a radial gap between the diaphragm and the frame. Other embodiments are also described and claimed.

An edge (29) for supporting a diaphragm assembly (100) with respect to a frame (26) is bonded to the frame (26) along the outer periphery thereof and joined to a diaphragm (27) in a position more peripherally inward than a voice coil (28) along the inner periphery thereof. The edge (29) partly overlaps diaphragm (27). This structure allows downsizing of the speaker, without reducing the sizes of a permanent magnet (21) and the edge (29).

Microelectromechanical systems (MEMS) include critical devices for various highly sensitive applications. However, MEMS operation may be impaired by vibration. A modular vibration control pedestal for integration with a MEMS is provided according to embodiments of the present invention which includes a piezoelectric perovskite oxide disposed on a substrate and a shape memory alloy component component disposed on the piezoelectric perovskite oxide. In particular embodiments of a MEMS device including a modular VCP, vibration is reduced by at least 50%.

A magnetic circuit having a dual magnet, a speaker and a vibration generating apparatus using the same are provided. The magnetic circuit includes a magnetic gap having a small magnetic loss and an increasing magnetic flux density, in which a uniform distribution of a line of magnetic force can be realized on yoke surfaces facing each other. The speaker includes lower and upper magnets which are disposed at a predetermine distance so that mutually identical polarities oppose each other; a first yoke integrally having a loop-type circulating circuit portion extended from the lower magnet to the upper magnet and an extension portion which is extended perpendicularly upwards from the lower magnet; a second yoke which connects between the lower and upper magnets and forms a magnetic gap between the second yoke and the extension portion of the first yoke; a coil dispose in the magnetic gap and wound around a bobbin; a frame which is extended from the first yoke; a vibrating diaphragm generating an acoustic sound in correspondence to a drive signal; a damper limiting a vibration range of the bobbin; and a center cap covering the bobbin.

Provided is an acoustic generator which has a high sound pressure at ultrahigh frequencies and which can suppress occurrence of large peak dips. An acoustic generator includes a film, a frame member disposed on an outer peripheral edge of the film, a piezoelectric element disposed on the film and inside the frame member, and a resin layer filled inside the frame member so as to cover the piezoelectric element.

The objective of the invention is to provide a bone conduction device, in particularly employed in the receiver of a bone conduction telephone, which is capable of obtaining sufficient sound quantities as to not only bone conduction sound but also aerial vibration sound to ensure clear reception of sound. The bone conduction device comprises a bone conduction device unit and a case receiving the same to serve as a vibration section, and is characterized in that a compliance increasing mechanism, such as corrugations, is disposed along the peripheral edge of the vibrating surface of the case having the bone conduction device unit fixed thereto.

A speaker has a diaphragm (16) and a suspension holder (19) supporting the diaphragm from the back surface of the diaphragm. The diaphragm has a bent section (21) disposed between its outer periphery and its inner periphery, with the portion to the outer periphery having a conical shape. The diaphragm is coupled to the suspension holder at the bent section. This configuration can omit a damper that causes nonlinearity and asymmetry of suspension, to reduce the harmonic distortion of the speaker and improve the power linearity and the performance of the speaker. The diaphragm can have a flat configuration at its inner peripheral portion, can be secured with sufficient rigidity, and can be rigidly secured to a frame of the sneaker. This can reduce the thickness of the diaphragm and enable formation of a smaller, low profile sneaker can be realized.