Electromagnet venturi pump/transducer systems and methods to make and use same. The membrane is made from a material that can be, for example, a steel membrane, having a ferrite disk that is pulled by the electromagnet to a set point and then the stiff membrane is oscillated about that set point.

Electromagnet venturi pump/transducer systems and methods to make and use same. The membrane is made from a material that can be, for example, a steel membrane, having a ferrite disk that is pulled by the electromagnet to a set point and then the stiff membrane is oscillated about that set point.

An apparatus includes a surface arranged to be mechanically displaced, first permanent magnet coupled with the surface, at least one supporting member for supporting the surface, base, second permanent magnet, coil coupled with the second magnet, and signal port electrically coupled with the coil. An electrical signal is configured to travel between the signal port and the coil. The electrical signal in the coil is proportional to mechanic displacement of the surface when a force equilibrium state of the surface is broken by the electrical signal in the coil or the mechanic displacement of the surface from a position of the force equilibrium state. The coil is arranged at least partially between the first magnet and the second magnet or around one of the first magnet, the second magnet. Either the same or different polarities of the first and second magnets are arranged to directly face each other at a distance.

An apparatus includes a surface arranged to be mechanically displaced, first permanent magnet coupled with the surface, at least one supporting member for supporting the surface, base, second permanent magnet, coil coupled with the second magnet, and signal port electrically coupled with the coil. An electrical signal is configured to travel between the signal port and the coil. The electrical signal in the coil is proportional to mechanic displacement of the surface when a force equilibrium state of the surface is broken by the electrical signal in the coil or the mechanic displacement of the surface from a position of the force equilibrium state. The coil is arranged at least partially between the first magnet and the second magnet or around one of the first magnet, the second magnet. Either the same or different polarities of the first and second magnets are arranged to directly face each other at a distance.

Loudspeaker unit with a membrane (2) and a plurality of drive units (5) driving the membrane (2). Each of the plurality of drive units (5) has n voice coils (3) and at least n+1 magnets (4), n being an integer larger than or equal to 1. The magnets (4) have an axial magnetization and are stacked in axial direction with similar pole parts of adjacent ones of the at least n+1 magnets facing each other. The at least n+1 magnets (4) are separated in the stack over a magnet separation distance (d.sub.m), the magnet separation distance (d.sub.m) being substantially equal to a width (w.sub.s) in the stack direction of the at least n voice coils (3).

Disclosed is a magnetic circuit structure of a transducer comprising a static magnetic field generating device which comprises magnet sets, the magnet sets comprise a first magnet set magnetized in a moving direction of the transducer, a second magnet set and a third magnet set located in a direction orthogonal to a static magnetic field generated by the first magnet set, a magnetization direction of the second magnet set is orthogonal to that of the first magnet set, a magnetization direction of the third magnet set is orthogonal to that of the second and first magnet sets, the second and third magnet sets increase a magnetic induction intensity of the static magnetic field. The magnetic circuit structure of the transducer in the present disclosure can effectively solve the problem that a driving force of the transducer applying thereof is not sufficient, thus increasing the efficiency of electric-to-mechanical conversion.

An apparatus includes a surface arranged to be mechanically displaced, first permanent magnet coupled with the surface, at least one supporting member for supporting the surface, base, second permanent magnet, coil coupled with the second magnet, and signal port electrically coupled with the coil. An electrical signal is configured to travel between the signal port and the coil. The electrical signal in the coil is proportional to mechanic displacement of the surface when a force equilibrium state of the surface is broken by the electrical signal in the coil or the mechanic displacement of the surface from a position of the force equilibrium state. The coil is arranged at least partially between the first magnet and the second magnet or around one of the first magnet, the second magnet. Either the same or different polarities of the first and second magnets are arranged to directly face each other at a distance.

An apparatus includes a surface arranged to be mechanically displaced, first permanent magnet coupled with the surface, at least one supporting member for supporting the surface, base, second permanent magnet, coil coupled with the second magnet, and signal port electrically coupled with the coil. An electrical signal is configured to travel between the signal port and the coil. The electrical signal in the coil is proportional to mechanic displacement of the surface when a force equilibrium state of the surface is broken by the electrical signal in the coil or the mechanic displacement of the surface from a position of the force equilibrium state. The coil is arranged at least partially between the first magnet and the second magnet or around one of the first magnet, the second magnet. Either the same or different polarities of the first and second magnets are arranged to directly face each other at a distance.

The present invention provides for an electroacoustic driver for use within an explosion proof loudspeaker or sounder and comprising a housing enclosing a coil of an electromagnet, the coil operatively coupled to an electromagnet core, a diaphragm located outside the housing for generating audible sound waves, a magnetic element located outside the housing and coupled to the diaphragm, wherein the electromagnet core extends through a wall of the housing from inside to outside of the housing to interact with the said magnetic element to cause movement of the diaphragm.

The present invention provides for an electroacoustic driver for use within an explosion proof loudspeaker or sounder and comprising a housing enclosing a coil of an electromagnet, the coil operatively coupled to an electromagnet core, a diaphragm located outside the housing for generating audible sound waves, a magnetic element located outside the housing and coupled to the diaphragm, wherein the electromagnet core extends through a wall of the housing from inside to outside of the housing to interact with the said magnetic element to cause movement of the diaphragm.