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Miniature loudspeaker and magnetic circuit having integrated air flow passage

A technology of airflow channel and magnetic circuit, which is applied in the directions of loudspeakers, circuits, sensors, etc.

Inactive Publication Date: 2007-11-14
SONION HORSENS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this longer and complicated ventilation path, the air in the area under the diaphragm may not necessarily be thoroughly ventilated

Method used

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  • Miniature loudspeaker and magnetic circuit having integrated air flow passage
  • Miniature loudspeaker and magnetic circuit having integrated air flow passage
  • Miniature loudspeaker and magnetic circuit having integrated air flow passage

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Embodiment Construction

[0062] The broadest aspects of the invention relate to a small loudspeaker and a magnetic system (motor) for such a small loudspeaker optimized for maximum motor power and enhanced thermal and acoustic ventilation. Thermal ventilation is required due to the very high temperature of the voice coil, and the temperature of the voice coil will reach 170°C when the amplifier or loudspeaker is operating at maximum power. Such high temperatures will cause "thermal stress", which reduces the electro-acoustic conversion efficiency of the loudspeaker. Worse case, the loudspeaker will be completely destroyed as the coils completely melt or disintegrate, the diaphragm is damaged and / or the coil and diaphragm disintegrate. The airflow channels of the magnetic circuit according to the invention provide fluid communication between the air surrounding the voice coil and the air outside the magnetic circuit, thereby providing optimal cooling of the voice coil. Furthermore, acoustic ventilatio...

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PUM

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Abstract

The present invention relates to a miniature electro-acoustic transducer comprising a magnetic circuit comprising a permanent magnet assembly adapted to generate a magnetic flux in an air gap, the magnetic circuit comprising a magnetically permeable yoke having one or more air flow passages arranged therein, the one or more air flow passages being in fluidic communication with the air gap to allow pressurised and / or heated air trapped blow a diaphragm of the transducer to be guided to the exterior of the magnetic circuit via said one or more air flow passages. The transducer further comprises a voice coil positioned in the air gap, the voice coil being operatively connected to the diaphragm. The one or more air flow passages are arranged in the yoke so as to guide pressurised and / or heated air in a plane being substantially perpendicular to the direction of movement of the diaphragm.

Description

technical field [0001] The present invention relates to a compact electro-acoustic transducer and magnetic circuit with one or more integrated airflow channels, thereby allowing pressurized and heated air to pass outside the magnetic circuit, thereby creating effective cooling of internal components such as voice coils . Background technique [0002] Future mobile phones are expected to be more compact, yet able to generate higher sound pressure levels than current mobile phones. Therefore, in order to meet the above requirements, loudspeakers designed for use in mobile phones are pushed toward smaller sizes, higher power operation, and higher maximum sound pressure capabilities. Therefore, outlets such as thermal and acoustic ventilation in small loudspeakers or loudspeakers are becoming more and more important. [0003] US2002 / 0131612 discloses a multifunctional exciter, including a housing, a diaphragm whose outer end is fixed on the upper end of the housing, a cylindri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R9/02
CPCH04R9/025H04R9/022H04R2499/11H04R2400/00H01L29/84H04R1/02H04R9/02
Inventor M·K·安德森L·约翰森C·劳尔森
Owner SONION HORSENS