Abstract

Apparatus for radiating an audio signal comprises an elongate metal rail (6), mounted relative to a structural surface on mountings (5, 26) adapted to minimise transmission of vibration from the rail to the surface, the rail having an audiofrequency actuator (8) coupled thereto so as to induce vibrations in the rail in a direction normal to the said surface, and means for supplying audiofrequency driving signals to the actuator.

IPC Classes  ?

• H04R 27/00 - Public address systems
• H04R 7/04 - Plane diaphragms

Abstract

An audio device, comprising a casing containing the following components: a. An audiofrequency actuator; b. power supply means; and c. driver means for supplying a driving signal to the actuator; d. a foot extending outside the casing beneath the casing so as to be engageable with a surface into which audiofrequency vibrations generated by the actuator can be coupled, whereby the surface radiates sound, characterised in that the foot is located adjacent to one end of the casing, and a support is located on the underside of the casing adjacent to the end thereof opposite to the said one end, whereby the mass of the device has a moment around said support acting through the foot.

IPC Classes  ?

• H04R 15/00 - Magnetostrictive transducers
• H04R 7/04 - Plane diaphragms
• H04R 25/00 - Deaf-aid sets

Abstract

A hermetically sealed actuator design for absorbing and reducing the effect of sound or vibration energy from a vibrating surface. The device comprises a body (1) containing a magnetostrictive core (2-6) a reaction mass (7) for energizing the actuator by compression, and a bearing or lever system to control the movement of the reaction mass. The actuator has a foot (11) for receiving the vibration from the structure into the device and a sensor (13) for monitoring vibration levels. The device can also function as an audio transmitter whereby it vibrates the surface onto which it is mounted and can be used for audio trans-10 mission through the structure or noise and vibration reduction by driving the surface out of phase with the vibration received from the structure.

IPC Classes  ?

• H04R 25/00 - Deaf-aid sets

Abstract

A magnetostrictive actuator comprises an assembly of at least two GMM rods (8, 9) spaced apart from each other on the same longitudinal axis, each rod being surrounded by a respective energising electromagnetic coil (10,11) 5 and being mounted between respective biasing permanent magnets (12, 13, 14), the assembly being mounted between mechanical pre-stressing means (20, 21) and a foot (3) adapted to couple the forces produced by the actuator into a surface.

IPC Classes  ?

• H04R 15/00 - Magnetostrictive transducers
• H01L 41/00 - SEMICONDUCTOR DEVICES; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR - Details thereof

Abstract

A hermetically sealed actuator design for absorbing and reducing the ef- fect of sound or vibration energy from a vibrating surface. The device comprises a body (1) containing a magnetostrictive core (2-6) a reaction mass (7) for en-5 ergising the actuator by compression, and a bearing or lever system to control the movement of the reaction mass. The actuator has a foot (11) for receiving the vibration from the structure into the device and a sensor (13) for monitoring vibration levels. The device can also function as an audio transmitter whereby it vibrates the surface onto which it is mounted and can be used for audio trans-10 mission through the structure or noise and vibration reduction by driving the sur- face out of phase with the vibration received from the structure.

IPC Classes  ?

• H01L 41/12 - Magnetostrictive elements
• F16F 15/00 - Suppression of vibrations in systemsMeans or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
• H04R 15/00 - Magnetostrictive transducers

Abstract

A magnetostrictive actuator comprises an assembly of at least two GMM rods (8, 9) spaced apart from each other on the same longitudinal axis, each rod being surrounded by a respective energising electromagnetic coil (10,11) 5 and being mounted between respective biasing permanent magnets (12, 13, 14), the assembly being mounted between mechanical pre-stressing means (20, 21) and a foot (3) adapted to couple the forces produced by the actuator into a surface.

IPC Classes  ?

• H01L 41/12 - Magnetostrictive elements
• H04R 15/00 - Magnetostrictive transducers

Goods & Services

Sound reproducing apparatus, namely, loudspeakers, equipment containing loud speakers, namely, stereos, CD, radio, MP3, TV, minidisk, phonograph, and cassette players, and equipment containing actuators which create sound, namely, amplifiers, audio speakers, acoustic conduits, transducers, acoustical transducers, audio outputs, headphones, and microphones; personal audio devices, namely, portable equipment which contains loudspeakers and portable equipment which contains actuators which create sound; personal audio devices, namely CD, radio, MP3, TV, phonographs, and cassette players; telephones; cordless telephones and cellular telephones; office communications systems, namely, telephone conferencing, public address and office intercoms; hands-free attachments for cellular telephones, namely, loudspeakers, audio speakers, earphones, microphones, and headphones attached by wire and wireless means; protective helmets incorporating communication devices, namely, communication devices attached by wire and wireless means that contain actuators which create sound; acoustic output devices, namely, amplifiers, audio speakers, acoustic conduits, transducers, acoustical transducers, audio outputs, headphones, and microphones for use with personal audio devices, namely telephones, CD, radio, MP3, TV and cassette players attached by wire and wireless means; magnetostrictive drive units for sound reproduction devices attached by wire and wireless means, namely, loudspeakers and equipment containing loudspeakers that create sound, namely, audio speakers, loud speakers, acoustic conduits, transducers, and acoustic transducers

Goods & Services

Sound reproducing apparatus; personal audio devices; telephones; cordless telephones and cellular telephones; office communications systems; hands-free attachments for cellular telephones; protective helmets incorporating communication devices; acoustic output devices for use with personal audio devices; magnetostrictive drive units for sound reproduction devices.