CN201657307U - Piezoelectric speaker - Google Patents

Abstract

The utility model relates to the field of speakers, in particular to a miniature ceramic piezoelectric speaker, which comprises a frame, a substrate and ceramic piezoelectric sheets, the substrate is arranged on the frame, the ceramic piezoelectric sheets, the plane areas of which are less than the area of the substrate, are attached on the substrate, wherein the parts of the substrate, which are exposed from the edges of the ceramic piezoelectric sheets, are alar parts, which are provided with corrugated rims, and the corrugated rims press the alar parts and movably fix the alar parts. Consequently, the vibrating ceramic piezoelectric sheets can drive the substrate to vibrate in the same frequency; since the edges of the substrate are movably fixed, the edges of the substrate are not limited by the rigid fixation of the boundary frame, consequently, the resonant frequency of the ceramic piezoelectric sheets can be reduced, and the performance of the speaker can be optimized.

Description

Piezoelectric speaker

[technical field]

The utility model relates to the loud speaker field, specifically refers to a kind of miniature potsherd piezoelectric speaker.

[background technology]

Development along with wireless telecommunications, Global Mobile Phone Users is more and more, the user not only is satisfied with conversation to the requirement of mobile phone, and want high-quality communication effect can be provided, especially at present the development of mobile multimedia technology, the speech quality of mobile phone becomes more important, and the microphone of mobile phone is as the voice pick device of mobile phone, and its design quality directly influences speech quality.

Potsherd has inverse piezoelectric effect, promptly under the effect of extra electric field, mechanical deformation takes place.Utilize this characteristic, potsherd can be used for making piezoelectric type vibration sounding devices such as piezo-electric loudspeaker, piezoelectric vibrator.

The structure of the piezo-electric acoustic generator of relevant existing structure comprises substrate, be embedded at on-chip power connection end, stick on on-chip piezoelectric ceramics sheet and lid is received on-chip cover plate, and described substrate edge is bonded on the framework of fixed substrate by elargol.When power connection end fed the signal of telecommunication, piezoelectric ceramics sheet generation inverse piezoelectric effect produced vibration, sounds.Yet this type of piezo-electric acoustic generator causes piezoelectric patches resonance frequency when vibration sounding higher because substrate is rigidly fixed between framework and the cover plate, has influenced the performance of product; And the problem that elargol is thrown off takes place in product easily, causes separating between press box frame and the substrate, makes the rate of finished products of product reduce.

[utility model content]

The purpose of this utility model is to solve the higher problem of piezoelectric ceramics harmonic frequency of loudspeakers, and a kind of piezoelectric speaker is provided.

In order to achieve the above object, the technical solution of the utility model is as follows:

A kind of piezoelectric speaker, a kind of piezoelectric speaker, comprise framework, be arranged on substrate on the framework, the piezoelectric ceramics sheet of the area of plane less than chip area is sticked on the substrate, the lateral section that wherein said substrate exposes at the piezoelectric ceramics sheet is an alar part, described alar part is provided with ring, and ring is pressed and put on alar part and active fixed substrate.

Preferably, the lateral edges minor face of described substrate is rigidly fixed on the framework, is provided with the gap between long limit and the framework.

The part that described ring is pressed on alar part is the location division of hollow boss.

Described location division is provided with groove towards the substrate direction, the lateral section of the active ccontaining alar part of described groove.

Described ring top is provided with the cover plate that combines with framework.

The utility model piezoelectric speaker, comprise framework, be arranged on substrate on the framework, the piezoelectric ceramics sheet of the area of plane less than chip area is sticked on the substrate, the lateral section that wherein said substrate exposes at the piezoelectric ceramics sheet is an alar part, described alar part is provided with ring, and ring is pressed and put on alar part and active fixedly alar part.The piezoelectric ceramics sheet of vibration drives substrate and does once per revolution vibration like this, because the side of substrate is active fixing, is not subjected to the restriction that rigidly fixes of side framework, helps reducing the resonance frequency of piezoelectric ceramics sheet, optimizes speaker performance.

[description of drawings]

Fig. 1 is the utility model perspective view;

Fig. 2 is the utility model blast structural representation;

Fig. 3 is the blast structural representation of another angle of the utility model.

[embodiment]

Below in conjunction with accompanying drawing, the utility model is elaborated.

Join shown in Figure 1ly, be the utility model piezoelectric speaker, the piezoelectric ceramics sheet 30 of involving vibrations sounding, described piezoelectric ceramics sheet 30 has inverse piezoelectric effect, promptly under the effect of extra electric field, mechanical deformation takes place.Piezoelectric ceramics sheet 30 and substrate (not shown) constitute vibration unit jointly, vibration unit is provided with ring 41,42, ring 41,42 by cover plate 50 press put fixing, behind power connection end (indicating) the feeding signal of telecommunication that cover plate 50 is provided with, promptly give 30 one field effects of piezoelectric ceramics sheet, inverse piezoelectric effect takes place in piezoelectric ceramics sheet 30, thereby vibration unit produces vibration, sounds.

As Fig. 2, shown in 3, be blast structural representation of the present utility model, it comprises framework 10, be arranged on the substrate 20 on the framework 10, the area of plane that is sticked respectively on the top and bottom of substrate 20 is less than the last piezoelectric patches 31 and the lower piezoelectric sheet 32 of substrate 20 areas, the lateral edges minor face 21A of wherein said substrate 20,21B is rigidly fixed on the framework 10, long limit 22A, be provided with gap 11A between 22B and the framework 10,11B, long limit 22A, 22B and minor face 21A, it is that length is long comparatively speaking that 21B compares, and substrate 20 has two minor face 21A like this, 21B is rigidly fixed on the framework 10; The lateral section that other described substrate 20 exposes at last piezoelectric patches 31 and lower piezoelectric sheet 32 is alar part (indicating), long limit 22A, 22B just are the part of alar part, be respectively equipped with ring 41,43 on the described alar part homonymy, ring 41,42 covers alar part and gap 11A, 11B, described ring 41,42 is pressed and is put on alar part and active fixedly alar part, just active fixed substrate 20.

For substrate 20 can actively be fixed, the part that described ring 41,43 is pressed on alar part is the location division 411,421 of hollow boss, and the bossing of location division 411,421 is in order better to be convenient to cover plate 50 location on the framework 10.Since location division 411,421 is a hollow boss, location division 411,421 just constitutes groove 412,422 towards substrate 20 directions so, the lateral section of described groove 412,422 active ccontaining alar parts, just long limit 22A, the 22B side edge portions of substrate 20.Must drive substrate 20 when 30 vibrations of the piezoelectric ceramics sheet on the substrate 20 also vibrates, because minor face 21A, the 21B of substrate 20 are rigidly fixed on the framework 10, then long limit 22A, 22B will be subjected to displacement by the high frequency microspur, then groove 412,422 lucky ccontaining parts are grown limit 22A, 22B, substrate 20 reaches active fixing purpose, be not subjected to the 10 totally-enclosed restrictions that rigidly fix of side framework, help reducing the resonance frequency of piezoelectric ceramics sheet 30, optimize the utility model piezoelectric speaker performance.

The above only is a better embodiment of the present utility model; protection range of the present utility model does not exceed with above-mentioned execution mode; as long as the equivalence that those of ordinary skills do according to the utility model institute disclosure is modified or changed, all should include in the protection range of putting down in writing in claims.

Claims (5)

1. piezoelectric speaker, comprise framework, be arranged on substrate on the framework, the piezoelectric ceramics sheet of the area of plane less than chip area is sticked on the substrate, it is characterized in that: the lateral section that described substrate exposes at the piezoelectric ceramics sheet is an alar part, described alar part is provided with ring, and ring is pressed and put on alar part and active fixed substrate.

2. according to the described piezoelectric speaker of claim 1, it is characterized in that: the lateral edges minor face of described substrate is rigidly fixed on the framework, is provided with the gap between long limit and the framework.

3. according to claim 1 or 2 described piezoelectric speakers, it is characterized in that: the part that described ring is pressed on alar part is the location division of hollow boss.

4. according to the described piezoelectric speaker of claim 3, it is characterized in that: described location division is provided with groove towards the substrate direction, the lateral section of the active ccontaining alar part of described groove.

5. according to claim 1 or 4 described piezoelectric speakers, it is characterized in that: described ring top is provided with the cover plate that combines with framework.

Images