US 10,382,858 B1Granted

System and method for reducing speaker vibration

AssigneeGM Global Technology Operations LLC

InventorsIan R. Singer, Dargham Alyassiry, Runhong Deng

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Abstract

A vibration reduction assembly includes a mass and an actuator. The mass is configured to be attached to a rear plate or a frame of a speaker in a manner that allows the mass to move along a longitudinal axis of a pole of the rear plate. The mass is sized to yield a force that is equal in magnitude and opposite in direction relative to a force generated by moving components in the speaker and acoustic pressure of the speaker. In one example, the actuator is configured to move the mass in phase with movement of a voice coil of the speaker along the longitudinal axis of the pole and in an opposite direction than the voice coil movement. In another example, the actuator is configured to move the mass out of phase with the voice coil movement and in the same direction as the voice coil movement.

Claims20

Dependent claims

An assembly for reducing vibration generated by a speaker, the vibration reduction assembly comprising:

a first rear plate including a base and a pole projecting from the base in a first direction, the pole having an outer radial surface;
a first front plate having an inner radial surface defining a hole through which the pole of the first rear plate extends, the outer radial surface of the pole opposing the inner radial surface of the first front plate;
a first magnet disposed between the first rear plate and the first front plate and surrounding the pole;
a first voice coil disposed between the outer radial surface of the pole and the inner radial surface of the first front plate and configured to move in the first direction or in a second direction opposite of the first direction when a voltage is applied to the first voice coil;
and
a mass attached to the first voice coil and sized to yield a first force that is equal in magnitude and opposite in direction relative to a second force generated by moving components in the speaker and acoustic pressure of the speaker.

3 more elements

A speaker assembly comprising:

a speaker including:
a first rear plate including a base and a pole projecting from the base in a first direction, the pole of the first rear plate having an outer radial surface;
a first front plate having an inner radial surface defining a hole through which the pole of the first rear plate extends, the outer radial surface of the pole opposing the inner radial surface of the first front plate;
a first magnet disposed between the first rear plate and the first front plate and surrounding the pole of the first rear plate;
a first voice coil disposed between the outer radial surface of the pole of the first rear plate and the inner radial surface of the first front plate and configured to move in the first direction or in a second direction opposite of the first direction when a voltage is applied to the first voice coil;
a frame within which the first front plate is mounted;
and
a diaphragm extending between the first voice coil and the frame and configured to generate noise in response to movement of the first voice coil;
and
a vibration reduction assembly including:
a mass attached to at least one of the first rear plate and the frame in a manner that allows the mass to move relative to the first rear plate in the first or second direction, wherein the mass is sized to yield a first force that is equal in magnitude and opposite in direction relative to a second force generated by moving components in the speaker and acoustic pressure of the speaker;
and
an actuator configured to:
move the mass in the second direction in phase with movement of the first voice coil in the first direction;
and
move the mass in the first direction in phase with movement of the first voice coil in the second direction.

13 more elements

A speaker assembly including:

a first rear plate including a base and a pole projecting from the base in a first direction, the pole of the first rear plate having an outer radial surface;
a first front plate having an inner radial surface defining a hole through which the pole of the first rear plate extends, the outer radial surface of the pole opposing the inner radial surface of the first front plate;
a first magnet disposed between the first rear plate and the first front plate and surrounding the pole of the first rear plate;
a first voice coil disposed between the outer radial surface of the pole of the first rear plate and the inner radial surface of the first front plate and configured to move in the first direction or in a second direction opposite of the first direction when a voltage is applied to the first voice coil;
a frame within which the first front plate is mounted;
a diaphragm extending between the first voice coil and the frame and configured to generate noise in response to movement of the first voice coil;
a mass attached to at least one of the first rear plate and the frame in a manner that allows the mass to move relative to the first rear plate in the first or second direction;
and
an actuator configured to:
move the mass in the first direction out of phase with movement of the first voice coil in the first direction;
and
move the mass in the second direction out of phase with movement of the first voice coil in the second direction.

9 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/904,628Filed 26 Feb 2018
Published: US 2019/0268690 A129 Aug 2019
Granted: 13 Aug 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04R 1/28
For obtaining desired frequency characteristic only: transducer mountings or enclosures modified by provision of mechanical or acoustic…
H04R 1/2873
Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself: for loudspeaker…
H04R 1/025
Casings; Cabinets ; Supports therefor; Mountings therein: arrangements for fixing loudspeaker transducers, e.g. in a box, furniture
H04R 1/028
Casings; Cabinets ; Supports therefor; Mountings therein: associated with devices performing functions other than acoustics, e.g. electric candles