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Distributed mode loudspeaker electromagnetic actuator with axial and radial magnetization circuits

A technology of actuators and axes, applied in electromechanical sensors, instruments, loudspeakers, etc., can solve problems such as limited topology and reduced magnetic flux density

Pending Publication Date: 2021-12-31
GOOGLE LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Due to the reduced magnetic flux density experienced at the outer surface of the air gap as compared to the magnetic flux density experienced at the inner surface of the air gap created by the pole pieces, the topology of the actuator 100 may be affected by its force generation. time limited

Method used

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  • Distributed mode loudspeaker electromagnetic actuator with axial and radial magnetization circuits
  • Distributed mode loudspeaker electromagnetic actuator with axial and radial magnetization circuits
  • Distributed mode loudspeaker electromagnetic actuator with axial and radial magnetization circuits

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Embodiment Construction

[0027] In general, the disclosure features electromagnetic transducers incorporating axially magnetized magnets within an annular radially magnetized wall. Such transducers are believed to be capable of generating more power per physical size and mass than conventional transducers. It is believed that this increased power may be made possible by combining, for example, thin, flat axially magnetized neodymium magnets with thin walled radially magnetized magnets.

[0028] Such an actuator can have features such as figure 2 The characteristic force versus frequency behavior is shown in . Here, the vertical axis shows the force factor, and the horizontal axis shows the frequency from 100 Hz to 20 kHz. Both axes are shown on a logarithmic scale. Actuator force at resonant frequency F 0 peaks at , in this case around 200Hz. At higher frequencies, such as 500Hz to 5kHz in the example shown, the force versus frequency response is relatively constant. At higher frequencies (eg, ...

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PUM

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Abstract

The invention relates to a distributed mode loudspeaker electromagnetic actuator with axial and radial magnetization circuits. An electromagnetic actuator includes an inner magnet disposed relative to an axis; an outer magnet disposed at a radial distance from the axis, an inner radial wall of the outer magnet facing an outer radial wall of the inner magnet, the inner radial wall and the outer radial wall being separated by an air gap; a voice coil disposed in an air gap separating the inner magnet and the outer magnet; and an actuator coupling plate attached to the voice coil. The inner magnet is axially magnetized and the outer magnet is radially magnetized. During operation of the device, electrical activation of the voice coil causes axial movement of the actuator coupling plate.

Description

[0001] Case Description [0002] This application belongs to the divisional application of the Chinese invention patent application 201980023313.X with the filing date of April 5, 2019. [0003] Cross References to Related Applications [0004] This application claims U.S. Application Serial No. 62, filed April 6, 2018, entitled "DISTRIBUTED MODE LOUDSPEAKERELECTROMAGNETIC ACTUATOR WITH AXIALLY & RADIALLY MAGNETIZED CIRCUIT" 654,173, the entire contents of which are hereby incorporated by reference in their entirety. technical field [0005] The present disclosure relates generally to audio transducers, and more particularly to the design of a lightweight, miniature, high power audio transducer. Background technique [0006] Many conventional speakers produce sound by inducing piston-like movement in a diaphragm. In contrast, panel audio speakers such as Distributed Mode Loudspeakers (DML) operate by inducing evenly distributed modes of vibration in the panel via electro-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R7/04H04R9/02H04R9/06
CPCH04R7/045H04R9/025H04R7/04H04R9/06H04R2499/11H04R2499/15G06F3/016G06F1/1688G06F1/1626G06F1/1637G06F1/1684H04R2400/03H04R1/2803
Inventor 格雷厄姆·罗伯特·兰迪克
Owner GOOGLE LLC