Miniature loudspeaker

Patent metadata

Field	Value
Publication number	US-10104476-B2
Application number	US-201515532066-A
Country	US
Kind code	B2
Filing date	Nov 11, 2015
Priority date	Dec 2, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

A loudspeaker module emitting sound at a lateral side comprises a loudspeaker unit and a module housing comprising a lower module housing, a middle module housing and an upper module housing. A space formed by the loudspeaker unit, the middle module housing and the lower module housing is a rear sound cavity. A space formed by the loudspeaker unit, the middle module housing and the upper module housing is a front sound cavity. The loudspeaker module further comprises a cover plate which forms a cavity together with the upper module housing. The cavity is communicated with the rear sound cavity through a conducting hole. By utilizing the loudspeaker module of the present invention, superfluous space of the upper module housing can be converted into the rear sound cavity, and therefore the size of the rear sound cavity is increased, and the acoustic performance of the loudspeaker module is improved.

First claim

What is claimed is:

1. A micro loudspeaker comprising a magnetic circuit system, a vibration system and a support system, wherein the magnetic circuit system comprises a yoke, a magnet accommodated in the yoke and a washer fixed to a surface of the magnet, the vibration system comprises a voice coil and a diaphragm, the support system comprises a housing and a front cover bonded to the housing, the magnetic circuit system and the vibration system are accommodated within a cavity formed by the housing and the front cover, and the yoke comprises a base portion extending in a horizontal direction and side portions protruding in a vertical direction, and wherein two major axis side portions are disposed symmetrically about a major axis of the base portion of the yoke, and two minor axis side portions are disposed symmetrically about a minor axis of the base portion of the yoke, sound holes to reduce the loss of magnetic induction lines of the magnetic circuit system are provided symmetrically at the two minor axis side portions of the yoke, and positions of the housing which correspond to the sound holes are provided with avoidance structures.

2. The micro loudspeaker according to claim 1 , wherein the minor axis side portions of the yoke have a rectangular structure formed by four upright edges, a bottom part of the sound hole is located at an upper portion of the upright edge at an inner side of the minor axis side portion of the yoke, a top part of the sound hole is lower than the upright edge at an outer side of the minor axis side portion of the yoke, and both ends of the sound hole are located in a space defined by two lateral sides of the minor axis side portion of the yoke.

3. The micro loudspeaker according to claim 2 , wherein both the yoke and the sound hole are rectangular.

4. The micro loudspeaker according to claim 2 , wherein the sound hole is covered with a damper.

5. The micro loudspeaker according to claim 1 , wherein a reinforcing member is bonded to an intermediate position of the diaphragm, and an inner edge of the diaphragm surrounds an outer periphery of the reinforcing member.

6. The micro loudspeaker according to claim 1 , wherein a certain distance exists between the magnet and the yoke, to form a magnetic gap, and the end parts of the voice coil close to the magnetic circuit system is suspended in the magnetic gap.

Assignees

• Goertek Inc

Inventors

• Ge Lianshan
• Dong Wenqiang
• Guo Tianli

Classifications

• H04R2400/11

  Aspects regarding the frame of loudspeaker transducers · CPC title

• H04R1/288 Primary

  for loudspeaker transducers · CPC title

• H04R9/06 Primary

  Loudspeakers · CPC title

• H04R9/025

  Magnetic circuit · CPC title

• H04R7/18

  at the periphery · CPC title