A piezoelectric sounding structure and mobile terminal

Abstract

The invention discloses a piezoelectric sounding structure and a mobile terminal, and relates to the technical field of loudspeakers. The piezoelectric sounding structure includes a PCB board and at least one piezoelectric ceramic tightly bonded to the PCB board. The piezoelectric ceramic is used to generate mechanical deformation through the inverse piezoelectric effect under the drive of the drive circuit. The tightly bonded PCB generates controlled mechanical vibration; and the vibration is transmitted by the PCB or the outer shell of the terminal device tightly bonded with the PCB and further pushes the air to generate sound. The present invention also proposes a mobile terminal having the above-mentioned piezoelectric sounding structure, the inner side of the housing of which is closely combined with the piezoelectric sounding structure mentioned in the present invention. The piezoelectric sounding structure provided by the present invention can greatly improve the sound radiation efficiency because the entire PCB board or the outer casing of the terminal structure can radiate sound waves, and can reduce the volume of the sounding structure while ensuring the volume and sound effect.

Description

Technical field [0001] The present invention relates to the technical field of loudspeakers, and in particular to a piezoelectric sound generating structure and a mobile terminal having the piezoelectric sound generating structure. Background technique [0002] With the development of portable consumer electronics, people’s requirements for small and thin portable electronic devices are getting higher and higher. Piezoelectric ceramic speakers are gradually being used by many portable consumer electronic products due to their ultra-light, ultra-thin, high-efficiency, and no need for large sound chambers. Favored. Portable consumer products are developing in the direction of ultra-thin, light-weight and small. Such system requirements put forward requirements for thinner, smaller, and more power-saving single electronic components. Piezoelectric ceramic speakers are used in more and more places because of their small, thin, light, and compact packaging. [0003] The basic principl...

AI Technical Summary

Problems solved by technology

The following problems usually occur when piezoelectric ceramics and their metal substrates are combined with the housing: when the piezoelectric ceramics and its metal substrates are combined with the housing, the bonding will not be firm when the piezoelectric ceramics and its metal substrates are bonded with the housing, and the metal diaphragm will vibrate locally unbalanced And other problems, which lead to the reduction of the sound pressure sensitivity of the entire sound system; the positive and negative signal lines are directly welded on the piezoelectric ceramic sheet, and there are often phenomena such as poor welding and excessive solder joint volume, which will short-circuit or open the piezoelectric ceramic speaker. and unable to work; or unreliable welding leads to damage to the piezoelectric ceramic speaker, etc.

[0004] On the other hand, in many existing designs of piezoelectric speakers, a single piece of piezoelectric ceramic is generally used to directly push the air through deformation to produce sound; since the deformation of piezoelectric ceramic is generally small, if the ceramic area is small, the sound will It is extremely weak and cannot be compared with traditional speakers; if the ceramic area is large, it is difficult to apply in batches because of the complex process, low yield and high cost

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