音膜激光辐照的表面完整性及声学特性研究

为解决高分子聚酯材料的音膜在使用过程中存在中频失真、发声性能有缺陷等问题,针对音膜在发声器件中的作用和特点,提出了一种新型高分子音膜材料激光改性工艺。采用不同功率,固定波长为975 nm的半导体连续激光辐照音膜表面,在保证其表面完整性的情况下获得不同的改性效果。结果表明,经激光辐照后,音膜试样材料表面完好,无破损、变形;音膜表面粗糙度降低,有利于提高音膜振动的一致性和均匀性;音膜失真、谐振频率等声学性能得以改善,产品的发声品质显著提高。试验所得结果对于当前采用高分子聚酯材料作为音膜的发声器件快速、高效地提升市场竞争力有着重要意义。

Acoustic characteristic and surface integrity of sound film induced by laser irradiation

In order to solve the problems of intermediate frequency(IF) distortion and acoustic performance deficiencies during the use of polymer polyester sound film, a novel laser modification technology on polymer sound film was proposed to improve the function and characteristics of sound film in sound device. Continuous semiconductor laser with the fixed-wavelength of 975 nm was applied to irradiate the surface of sound film with different laser power. Based on the assurance of the sound film surface integrity, different effects of laser irradiation on modification of sound film were obtained. The results show that after laser irradiation, the surface of sound film is intact without breakage or deformation. The surface roughness of the sample decreases, which is benefit for raising the consistency and uniformity of sound film during the vibration process. The sound film distortion, the resonant frequency and other acoustic properties are improved, moreover, the sound quality of the product is significantly improved. Results obtained in the experiment are of great significance to quickly and efficiently enhance the market competitiveness of the sound devices using polymer polyester sound film.