CN201523435U

CN201523435U - Improved micro speaker with high frequency characteristic

Info

Publication number: CN201523435U
Application number: CN2009200606196U
Authority: CN
Inventors: 蔡阳生; 张承云; 费艳锋
Original assignee: Guangzhou University
Current assignee: Guangzhou University
Priority date: 2009-07-16
Filing date: 2009-07-16
Publication date: 2010-07-07
Anticipated expiration: 2019-07-16

Abstract

The utility model discloses an improved micro speaker with high frequency characteristic, comprising a circular sound radiation panel (1) with sound radiation holes (8), and a transduction element (3 or 11) generating sound waves; and a circular sound assisting cavity is formed between the sound radiation panel (1) and the transduction element (3 or 11). The micro speaker is characterized in that except the sound radiation holes which are distributed by being symmetrical to the geometric center of the sound radiation panel, the sound radiation holes (8) take a ray passing though the geometric center of the sound radiation panel (1) as an axis and are distributed symmetrically. The micro speaker has the obvious effects of mild tone quality and fullness bass.

Description

A kind of Microspeaker of high frequency characteristics improvement

Technical field:

The utility model relates to a kind of loud speaker, is specifically related to a kind of Microspeaker and Microspeaker cavity system.

Background technology:

Microspeaker is widely used on the communication apparatus as mobile phone one class, in order to improve its low frequency (high frequency) Frequency Response, all is to rely on the design of the design of vibrating diaphragm or the signal output high band by circuit to realize usually.Also attempt in the prior art to improve its high frequency characteristics, but this measure meeting obviously reduces the output of low-frequency sound pressure by the perforated area that reduces acoustic radiation face cover.

The notable feature of the perforate mode of existing Microspeaker acoustic radiation face is the center symmetry, and the acoustic radiation hole of promptly being offered is symmetrical in the geometric center of acoustic radiation face, has only even distribution and non-uniform Distribution not.Fig. 1 in the Figure of description (a) is centrosymmetric exemplary, and Fig. 1 (b) is center symmetry and equally distributed exemplary.The inventor has carried out deep research to existing centrosymmetric perforate mode, and lot of experiment results shows that its high frequency sound curve filtering is undesirable, and low-frequency sound pressure output also can reduce in a large number when reaching the High frequency filter effect.Therefore, seek a kind of desirable mode of offering the acoustic radiation hole, for the high frequency characteristics of improving Microspeaker, the tonequality that improves Microspeaker has great importance.

Summary of the invention:

Go up deficiency in view of prior art exists, technical problem to be solved in the utility model is to improve the high frequency Frequency Response of Microspeaker.

The solution that the utility model solves the problems of the technologies described above is:

A kind of Microspeaker of high frequency characteristics improvement, it comprises the acoustic radiation panel of the circle with acoustic radiation hole and produces the inverting element of sound wave, form a circle between described acoustic radiation panel and the inverting element and help the operatic tunes, it is characterized in that, described acoustic radiation hole is that axis is symmetrically distributed with a ray through acoustic radiation panel geometric center, but does not comprise the acoustic radiation hole that is symmetrical in the distribution of acoustic radiation panel geometric center.

Microspeaker described in the utility model can be a miniature electric formula loud speaker, also passable piezoelectric ceramic loudspeaker or Microspeaker cavity and earphone cavity; Described acoustic radiation Kongzui is distributed in the edge of described acoustic radiation panel well.

Because non-centrosymmetrical perforate mode is adopted in the acoustic radiation hole on the acoustic radiation panel of Microspeaker described in the utility model, effectively filtering the high frequency acoustic pressure of frequency of sound wave at 10～20KHz, therefore have the remarkable result that tonequality is soft, bass is plentiful; In addition, this measure has reduced the designing requirement of the vibrating diaphragm and the audio frequency processing circuit of Microspeaker significantly, and the reduction amplitude of its cost also is foreseeable.

Description of drawings

Fig. 1 is the structural representation of the acoustic radiation panel of existing Microspeaker, and wherein, Fig. 1 (a) is the centrosymmetric acoustic radiation panel in acoustic radiation hole, and Fig. 1 (b) is center, acoustic radiation hole symmetry and equally distributed acoustic radiation panel.

Fig. 2 and Fig. 3 are the structural representation of a specific embodiment of this practicality, and wherein Fig. 2 is a front view, and Fig. 3 is a right view.

Fig. 4 and Fig. 5 are the structural representation of this practical another specific embodiment, and wherein Fig. 4 is a front view, and Fig. 5 is a right view.

Fig. 6 and Fig. 7 are this practicality structural representation of a specific embodiment again, and wherein Fig. 6 is a front view, and Fig. 7 is a right view.

Fig. 8 is the frequency response curve figure of an existing concrete Microspeaker (employing center symmetry perforate mode).

The frequency response curve figure of a concrete embodiment of Fig. 9 Microspeaker described in the utility model (adopting non-centrosymmetry perforate mode).

Embodiment

Referring to Fig. 2 and Fig. 3, present embodiment is the moving-coil type Microspeaker, it is by acoustic radiation panel 1 and conventional support 2, inverting element vibrating diaphragm 3, polarity sheet 4, magnet 5, voice coil loudspeaker voice coil 6, the ferromagnetic cover 7 of U is formed, wherein acoustic radiation panel 1 is circular, diameter is 14.2mm, which is provided with three circular acoustic radiation holes 8, wherein, the diameter in the acoustic radiation hole 8 that diameter is bigger is 3.52mm, the center of circle is located on the ray OX of process acoustic radiation panel 1 center O, distance apart from acoustic radiation panel 1 center O is about 3/5 of acoustic radiation panel 1 radius, the diameter in the acoustic radiation hole 8 that two diameters are less is respectively 1.2mm, be symmetrically distributed in the left and right sides in the bigger acoustic radiation hole 8 of diameter, be about 1/2 of acoustic radiation panel 1 radius respectively apart from the distance of acoustic radiation panel 1 center O.Above-mentioned radiant panel 1 is embedded in support 2, and forms the air chamber of a circle between the vibrating diaphragm 3, and promptly circle helps the chamber 9 that shakes

Referring to Fig. 4 and Fig. 5, this example is to improve on the basis of Microspeaker illustrated in figures 1 and 2, its improvements are also to comprise a discoid cavity 10, this cavity 10 contains all elements except that acoustic radiation panel 1 in it, wherein acoustic radiation panel 1 to around equidistant extension and fuse with the perisporium of cavity 10.

Referring to Fig. 6 and Fig. 7, present embodiment is a piezoelectric microspeaker, it is made up of the acoustic radiation panel 1 of circle and common piezoelectric ceramic piece 11, dish-shaped cone 12, wherein, piezoelectric ceramic piece 11 is for producing the inverting element of sound wave, it is embedded at the center of dish-shaped cone 12, and the edge of dish-shaped cone 12 sticks on the acoustic radiation panel 1, forms a circle between the piezoelectric ceramic piece 11 harmony radiant panels 1 and helps the chamber that shakes.In this example, the diameter of acoustic radiation panel 1 is 14.2mm, offer 5 acoustic radiation holes 8 on it, wherein, the diameter in the acoustic radiation hole 8 that diameter is bigger is 2.8mm, the center of circle is located on the ray OX of process acoustic radiation panel 1 center O, distance apart from acoustic radiation panel 1 center O is about 3/5 of acoustic radiation panel 1 radius, the diameter in the acoustic radiation hole 8 that 4 diameters are less is respectively 2mm, be symmetrically distributed in the left and right sides in the bigger acoustic radiation hole 8 of diameter, also be about 3/5 of acoustic radiation panel 1 radius respectively apart from the distance of acoustic radiation panel 1 center O.

For the further beneficial effect of the described Microspeaker of checking utility model, contrast experiment's method and result is briefly described below.

1, experiment material:

Sample: Fig. 2 and embodiment shown in Figure 3;

Reference substance: on the basis with Fig. 2 and embodiment shown in Figure 3, the distribution form in the acoustic radiation hole 8 on the acoustic radiation panel 1 is made into shown in Fig. 1 (a), and guarantee that its percent opening and Fig. 2 are identical with embodiment shown in Figure 3, promptly equal 11.8%.

2, test condition: test voltage is that 0.89V, measuring distance are 10cm, baffle test

3, detecting instrument: B﹠amp; K2012

4, result: the frequency response curve of reference substance as shown in Figure 8, the frequency response curve of sample is as shown in Figure 9.

5, conclusion: as seen with Fig. 8 and Fig. 9, the sound wave that Microspeaker spread out of of symmetry perforate mode (reference substance) has acoustic pressure output and a bigger peak is arranged at 10KHz～20KHz high band, exceed about 12dB than Mid Frequency, and there is the bandwidth above 10KHz at the peak, and asymmetric perforate mode (sample) though the sound wave that Microspeaker spread out of at 9KHz～10KHz high band a bigger peak is arranged also, exceed about 10dB than Mid Frequency, and its bandwidth difficulty is about 1KHz, obvious asymmetric perforate mode effectively filtering the high band sound wave of sound wave medium frequency at 10～20KHz, the high frequency characteristics of the more symmetrical perforate mode of its high frequency characteristics is significantly improved, obvious asymmetric perforate mode effectively filtering the high band sound wave of sound wave medium frequency at 10～20KHz, the high frequency characteristics of the more symmetrical perforate mode of its high frequency characteristics is significantly improved.

Claims

1. the Microspeaker of high frequency characteristics improvement, it comprises the acoustic radiation panel (1) of the circle with acoustic radiation hole (8) and produces the inverting element of sound wave, form a circle between described acoustic radiation panel (1) and the inverting element and help the operatic tunes (9), it is characterized in that, except that the acoustic radiation hole that is distributed in acoustic radiation panel geometric center, described acoustic radiation hole (8) is that axis is symmetrically distributed with a ray through acoustic radiation panel (1) geometric center.

2. the Microspeaker of a kind of high frequency characteristics improvement according to claim 1 is characterized in that described acoustic radiation hole (8) is distributed in the edge of described acoustic radiation panel (1).

3. the Microspeaker of a kind of high frequency characteristics improvement according to claim 1 and 2, it is characterized in that, it also comprises a discoid cavity (10), this cavity (10) will contain in it except that all elements the acoustic radiation panel (1), wherein acoustic radiation panel (1) to around equidistant extension and fuse with the perisporium of cavity (10).