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CN-112770232-B - Miniature loudspeaker

CN112770232BCN 112770232 BCN112770232 BCN 112770232BCN-112770232-B

Abstract

The invention discloses a miniature loudspeaker, which comprises an upper shell, a lower shell covered on the upper shell and a loudspeaker unit fixed between the upper shell and the lower shell, wherein the upper shell is divided into a front sound cavity and a rear sound cavity by a vibrating diaphragm of the loudspeaker unit, a first sound outlet communicated with the front sound cavity is formed in the upper shell, a second sound outlet is also formed in the upper shell, a phase inversion sound channel is arranged between the upper shell and the lower shell, one end of the phase inversion sound channel is communicated with the rear sound cavity, the other end of the phase inversion sound channel is communicated with the second sound outlet, sound waves generated by a vibrating diaphragm forced to vibrate in the front sound cavity are radiated to the outside through the front sound cavity and the first sound outlet, and sound waves generated by the vibrating diaphragm in the rear sound cavity are radiated to the outside through the rear sound cavity, the phase inversion sound channel and the second sound outlet or radiated to the outside through the first sound outlet. The micro-speaker provided by the invention has the advantages that through the design of the phase inversion sound structure, the loudness of the micro-speaker is effectively improved under the condition that other acoustic performances are not influenced.

Inventors

  • JIANG CHAO

Assignees

  • 苏州智集芯科技有限公司

Dates

Publication Date
20260505
Application Date
20210129

Claims (8)

  1. 1. The miniature loudspeaker comprises an upper shell, a lower shell covered on the upper shell and a loudspeaker unit fixed between the upper shell and the lower shell, wherein the loudspeaker unit comprises a vibrating diaphragm which divides the upper shell into a front sound cavity and a rear sound cavity, a first sound outlet hole communicated with the front sound cavity is formed on the upper shell, The upper shell is also provided with a second sound outlet; an inverted sound channel is arranged between the upper shell and the lower shell, one end of the inverted sound channel is communicated with the rear sound cavity, the other end of the inverted sound channel is communicated with the second sound outlet, and the distance between the center points of the first sound outlet and the second sound outlet is less than 100mm; A first communication channel is formed between the second sound outlet and the first sound outlet, sound waves generated by the forced vibration diaphragm in the front sound cavity are radiated to the outside through the front sound cavity and the first sound outlet, and sound waves generated by the forced vibration diaphragm in the rear sound cavity are radiated to the outside through the first sound outlet after passing through the rear sound cavity, the phase-inversion sound channel, the second sound outlet and the first communication channel, and the sound waves do not pass through the front sound cavity; the diameter of the loudspeaker unit is less than or equal to 40mm; The first sound outlet and the second sound outlet are arranged on the same side of the upper shell at intervals, and a sealing side wall is arranged between the second sound outlet and the first sound outlet so as to completely isolate sound waves generated in the front sound cavity and the rear sound cavity.
  2. 2. The micro-speaker of claim 1, wherein the second sound outlet is provided on the same side of the housing as the first sound outlet in communication, and sound waves generated in the front and rear sound chambers radiate from the same sound outlet to the outside.
  3. 3. The micro-speaker of claim 1, wherein the upper case has a receiving groove formed therein, the diaphragm of the speaker unit is fitted into the receiving groove to separate sound waves generated from front and rear sides of the diaphragm, the receiving groove and the front side of the diaphragm of the speaker unit together form the front sound chamber, and the upper case, the lower case, and the rear side of the diaphragm of the speaker unit excluding the receiving groove portion together form the rear sound chamber.
  4. 4. A micro-speaker according to claim 3, wherein one or more sound outlets are provided at the corners or the middle of the speaker unit, and the side of the diaphragm of the speaker unit facing away from the front sound cavity communicates with the rear sound cavity through the sound outlets.
  5. 5. The micro-speaker of claim 3, wherein the receiving groove has a first outer side wall, the upper housing has a second outer side wall and a top wall connected between the first and second outer side walls, and the first, second, top wall and lower housing collectively surround to form the inverted acoustic channel.
  6. 6. The micro-speaker of claim 1, wherein the port portion of the first sound outlet near the front sound cavity and the port portion of the second sound outlet near the inverted sound channel are each provided with a sealing member in surrounding relation, and the sealing member is attached to the outer side wall of the port portion.
  7. 7. The micro-speaker of claim 1, wherein dust screens are disposed outside the first and second sound outlet holes.
  8. 8. The micro-speaker of claim 1, wherein the rear acoustic chamber includes a plurality of sub-rear acoustic chambers having different sizes, and passages are provided between adjacent sub-rear acoustic chambers to communicate with each other.

Description

Miniature loudspeaker Technical Field The invention relates to the technical field of electroacoustic products, in particular to a miniature loudspeaker. Background The loudspeaker design currently in common use is based on a basic principle that a plane-like vibration system radiates sound both forward and backward. The term "forward" as used herein refers to a normal direction of a normal plane of the vibration system defined by man, and the term "backward" refers to a direction opposite to the normal direction. Because the low-frequency sound waves have larger volatility, the backward radiated sound can bypass the vibration system to interfere with the forward radiated sound, so that the sound field is fluctuated and the phase is disordered, and the heard sound is negligent. In order to avoid the phenomenon, a closed box type loudspeaker is designed, namely, the sound radiated backward is enclosed in a small space, and the sound radiated forward is not interfered by the sound radiated forward and mutually strengthened by algorithm control; In order to fully utilize the sound radiated backward, the existing speaker design with the phase-inverted sound structure is based on the closed box type speaker design, and a channel is opened up from the closed back cavity so that the sound radiated backward can still be transmitted to interfere with the sound radiated forward. However, since the opened channel is designed artificially, the degree of interference of the forward and backward radiated sounds can be strictly controlled so that the interference is developed in a low frequency range toward the benefit of the increase in loudness. The technology of using phase inversion sound in the field of micro-loudspeakers is difficult, namely, the technology is firstly required to control sound waves radiated by phase inversion sound control through an algorithm, the algorithm is complex, secondly, the application occasion is complex, the matching of a device and an external system structure is required to be considered, thirdly, the size is small, the conventional phase inversion design cannot be directly applied, fourthly, the design is compact, the phase inversion design is easy to cause performance loss in other aspects, and the whole body is pulled to be moved. Thus none of the art has been successful in the micro-speaker field. Disclosure of Invention The invention aims to provide a micro-speaker, which can effectively improve the loudness of the micro-speaker under the condition of not affecting other acoustic performances. In order to solve the technical problems, the technical scheme of the invention is as follows: The miniature loudspeaker comprises an upper shell, a lower shell covered on the upper shell and a loudspeaker unit fixed between the upper shell and the lower shell, wherein the loudspeaker unit comprises a vibrating diaphragm, the vibrating diaphragm divides the upper shell into a front sound cavity and a rear sound cavity, and a first sound outlet hole communicated with the front sound cavity is formed in the upper shell; The upper shell is also provided with a second sound outlet; an inverted sound channel is arranged between the upper shell and the lower shell, one end of the inverted sound channel is communicated with the rear sound cavity, the other end of the inverted sound channel is communicated with the second sound outlet, and the distance between the center points of the first sound outlet and the second sound outlet is less than 100mm; the sound wave generated by the forced vibration vibrating diaphragm in the front sound cavity radiates to the outside through the front sound cavity and the first sound outlet, and the sound wave generated by the forced vibration vibrating diaphragm in the rear sound cavity radiates to the outside through the rear sound cavity, the phase-inversion sound channel and the second sound outlet or radiates to the outside through the first sound outlet. Preferably, the first sound outlet and the second sound outlet are arranged on the same side of the upper shell at intervals, and a sealing side wall is arranged between the second sound outlet and the first sound outlet so as to completely isolate sound waves generated in the front sound cavity and the rear sound cavity. Preferably, the second sound outlet is disposed on the same side of the housing as the first sound outlet, and sound waves generated in the front sound chamber and the rear sound chamber radiate from the same sound outlet to the outside. Preferably, the upper housing is provided with a receiving groove, the diaphragm of the speaker unit is embedded in the receiving groove to separate sound waves generated on the front side and the rear side of the diaphragm, the receiving groove and the front side of the diaphragm of the speaker unit form the front sound cavity together, and the upper housing, the lower housing and the rear side of the diaphragm of the speaker unit form the rear sound cavity