Robert Boschgmbh

Alan J Babb

Andrew M Grunloh

David Edward Carlson

David E Carlson

A voice coil for use with a loudspeaker. The voice coil includes a bobbin that has a first layer of a non-conductive material infused with a high-temperature adhesive, a second layer of a non-conductive material infused with a high-temperature adhesive, and a layer of thermally-conductive material located in between the first layer of a non-conductive material and the second layer of a non-conductive substance, and a conductive wire wrapped around the bobbin.

High power voice coil

A multi-stage mechanical suspension system extends a linear operating range for a loudspeaker and prevents mechanical damage on explosive peaks. The system includes a pair of spaced contact receivers that limit the travel of a contactor. The system provides a flat linear response at low frequencies as the contact receivers are intermittently or occasionally contacted by the contactor during operation of the loudspeaker. The system enables creation of different regions of non-linearity within a total stiffness versus deflection curve of a loudspeaker suspension system. The non-linearity in each region can be controlled individually, so long as the non-linearity by region increases moving away from the rest position. Thus, a plateau of substantially linear stiffness may extend for a large portion of the total displacement allowed for a voice coil and suspension components before a region of non-linear stiffness occurs only at the ends of an allowable excursion to limit the motion. More than two regions of stiffness also can be created to achieve maximum performance and stability.

Loudspeaker with multiple stage suspension system

A low frequency transducer arrangement includes a substantially cylindrical structure surrounding a pole piece. The pole piece and the substantially cylindrical structure define a substantially cylindrical air gap therebetween. Two opposite ends of the air gap are both open and separated from each other in an axial direction. A first magnet is disposed in either the pole piece or the substantially cylindrical structure. A second magnet is separated in the axial direction from the first magnet by a middle magnetic gap. The second magnet is disposed in either the pole piece or the substantially cylindrical structure. The first and second magnets provide flux in a same direction in the middle magnetic gap. A top magnetic gap is disposed axially adjacent the first magnet and opposite the middle magnetic gap. A bottom magnetic gap is disposed axially adjacent the second magnet and opposite the middle magnetic gap. A voice coil is at least partially disposed in the air gap and operates in the middle magnetic gap.

Multiple magnetic air gap motor

A low frequency transducer arrangement includes at least one substantially annular magnet. A voice coil is disposed within and concentric with the magnet. A pole is disposed within and concentric with the voice coil. An air gap is defined between the magnet and the pole. The pole includes a bottom half having a downwardly facing axial recess. A plurality of first air passages extend laterally from the axial recess and fluidly interconnect the recess and the air gap. A top half has an upwardly facing axial recess. A plurality of second air passages extend laterally from the upwardly facing axial recess and fluidly interconnect the upwardly facing recess and the air gap. The first air passages and/or the second air passages are non-radially oriented.

Growing community of inventors

Burnsville, MN, United States of America

Alan J Babb