SPEAKER BOX

[0001] The present invention relates to the technical field of electroacoustic conversion, and particularly, to a speaker box.

[0002] In recent years, with the rapid development of mobile communication technologies, consumers are increasingly using mobile communication devices having a voice function, such as portable phones, handheld game consoles, laptop computers and the like. When the speaker box is used as a voice playing device, the design thereof directly affects voice performance of mobile communication devices. In order to meet the market demand for thinning and high tone quality, higher requirements are raised on the design of the speaker box.

[0003] In the related art, a speaker box includes an upper shell, a lower shell and a speaker unit. The speaker unit includes a diaphragm. The diaphragm and the upper shell are spaced apart to define a front acoustic cavity. A sound transmitting channel is molded with a side wall of the upper shell. The front acoustic cavity and the sound transmitting channel constitute a front cavity. Such a structure may generate a resonance peak at a high frequency response. With popularity of stereo application of the mobile terminal, the higher frequency response of the speaker is no longer pursued. Moreover, the excessively high frequency response (especially 4000-6000 Hz) may cause problems of non-ideal tone quality such as a harsh sound and a sharp labiodental.

[0004] Therefore, it is urgent to provide a new speaker box to solve the above drawbacks.

[0012] The above described embodiments are merely intended to illustrate the present invention, and it should be noted that, without departing from the inventive concept of the present invention, the improvements made by those skilled in the related art shall fall within the protection scope of the present invention.

[0013] As shown in FIG. 1 to FIG. 5, the present invention provides a speaker box 100. The speaker box 100 includes an upper shell 1, a lower shell 2, a speaker unit 3 having a diaphragm 31, a partition wall 4, a cover plate 5, a resonant cavity 10, a front acoustic cavity 20, a sound transmitting channel 30, a front cavity 40, and a rear cavity 50.

[0014] The upper shell 1 is configured to support and protect the speaker unit 3. The lower shell 2 covers the upper shell 1 and defines a receiving space together with the upper shell 1. The speaker unit 3 is received in the receiving space which is divided into the front cavity 40 and the rear cavity 50 by the speaker unit 3. The diaphragm 31 is configured to vibrate and emit sound. The upper shell 1 and the diaphragm 31 are spaced apart to define the front acoustic cavity 20. The upper shell 1, the speaker unit 3 and the lower shell 2 together define the rear cavity 50.

[0015] The partition wall 4 is formed by extending from a top wall 11 towards the lower shell 2. The cover plate 5 extends from the partition wall 4 towards a support wall 13. The partition wall 4, the cover plate 5 and the support wall 13 define at least two resonant cavities 10 spaced apart from each other, and the resonant cavities 10 are in communication with the front cavity 40.

[0016] The upper shell 1 includes a top wall 11, a side wall 12 and a support wall 13. The top wall 11 faces right the diaphragm 31. The side wall 12 extends from the top wall 11 towards the lower shell 2 and is fixed to the lower shell 2. The support wall 13 extends from the top wall 11 towards the lower shell 2 and is fixed to the support wall 13 of the speaker unit 3. The support wall 13 surrounds an outer circumference of the speaker unit 3.

[0017] The sounding channel 30 is formed at the upper shell 1 and communicates the front acoustic cavity 20 with the outside. The front acoustic cavity 20 and the sounding channel 30 together define the front cavity 40 for transmitting sound to the outside.

[0018] Further, the side wall 12 is provided with a sound transmitting hole 120 at a position corresponding to the sounding channel 30. The upper shell 1 further includes a baffle 14. One end of the baffle 14 abuts against the speaker unit 3, and the other end of the baffle 14 extends to the sound transmitting hole 120. The sound transmitting channel 30 is formed between the baffle 14 and the top wall 11. The resonant cavity 10 and the sound transmitting channel 30 are arranged at two opposite sides of the speaker unit 3.

[0019] The support wall 13, corresponding to the resonant cavity 10, is provided with a through-hole 130 communicating the resonant cavity 10 with the front cavity 40. The resonant cavity 10 communicates with the front cavity 10 only via the through-hole 130.

[0020] In this embodiment, two resonant cavities 10 are provided. In other embodiments, other number of the resonant cavities 10 may be provided. The resonant cavity 10 includes a first resonant cavity 101 and a second resonant cavity 102 that are spaced apart from each other. The partition wall 4 includes a first blocking wall 41, a second blocking wall 42, and a third blocking wall 43. The first blocking wall 41 extends from a side of the supporting wall 13 facing away from the sound transmitting channel 30 towards the interior of the rear cavity 50. The second blocking wall 42 and the third blocking wall 43 extend from an end of the first blocking wall 41 facing away from the support wall 13 towards the support wall 13, respectively. The first blocking wall 41 and the third blocking wall 43 are located at two opposite sides of the second blocking wall 42.

[0021] The first resonant cavity 101 is formed between the first blocking wall 41 and the second blocking wall 42. The second resonant cavity 102 is formed between the third blocking wall 43 and the first blocking wall 41.

[0022] Further, the through-hole 130 and the resonant cavity 10 are provided is in one-to-one correspondence. The through-hole 130 includes a first through-hole 1301 in communication with the first resonant cavity 101, and a second through-hole 1302 in communication with the second resonant cavity 102. A size of the first through-hole 1301 is smaller than or equal to a width of an end of the first resonant cavity 101 close to the support wall 13. A size of the second through-hole 1302 is smaller than or equal to a width of an end of the second resonant cavity 102 close to the support wall 13.

[0023] The cover plate 5 includes a first steel sheet 51 and a second steel sheet 52. The first steel sheet 51 covers the first blocking wall 41 and the second blocking wall 42. The second steel sheet 52 covers the first blocking wall 41 and the third blocking wall 43. The first steel sheet 51 and the second steel sheet 52 are each ultrasonically sealed from the partition wall 4 and the support wall 13. The first steel sheet 51 and the second steel sheet 52 are each in a thin sheet shape. The first steel sheet 51 and the first resonant cavity 101 match in shape. The second steel sheet 52 and the first resonant cavity 101 match in shape. The cover plate 5 is a plastic cover plate, a PET cover plate, or a steel sheet.

[0024] Based on the Helmholtz resonance principle, the first resonant cavity 10 and the second resonant cavity 20 can form anti-resonance at a resonance peak position of the front cavity 40 per se, so that a flatness of a high frequency response of the speaker box 100 can be improved, and resonant amplification effect of noise of the front cavity 40 can also be effectively reduced, thereby effectively improving the acoustic performance of the speaker box 100. As shown in FIG. 6, curve I is a frequency response graph of a speaker known in the related art; curve II is a frequency response graph of a speaker box having a first resonant cavity and a second resonant cavity that have one size provided by the present invention; and curve III is a frequency response graph of a speaker box having a first resonant cavity and a second resonant cavity that have another size provided by the present invention. Is can be seen from FIG. 6 that the frequency responses of the speaker boxes provided by the present invention are significantly reduced in a frequency range of 4000-6000 Hz.

[0025] By adjusting the size and shape of the partition wall 4, the sizes of the first resonant cavity 101 and the second resonant cavity 102 can be changed, so that the resonance peak value can be effectively lowered, thereby achieving the optimal sounding effect.

[0026] Compared with the related art, in the speaker box 100 provided by the present invention, by providing the first resonant cavity 101 and the second resonant cavity 102 that are in communication with the front cavity 40, the high frequency resonance peak and sensitivity can be effectively reduced; meanwhile, the partition wall 4 defining the first resonant cavity 101 and the second resonant cavity 102 is received in the receiving space of the speaker box 100 and is located at a side of the supporting wall 13 without occupying the space in height of the speaker box 100, so that the requirements for thinning and lighting design of the speaker box 100 can be achieved.

[0027] The above described embodiments are merely intended to illustrate the present invention, and it should be noted that, without departing from the inventive concept of the present invention, the improvements made by those skilled in the related art shall fall within the protection scope of the present invention.