Fingerprint identification system is increasingly used in various confidential systems because of the uniqueness for human fingerprint.Meanwhile,the fingerprint system tends to be more small-sized and more portable with the fast development of embedded fingerprint identification systems.Hence,a fingerprint identification system with smaller size and better resolution has become the trend.Through dividing focal power,double Gauss,as well as Scheimpflug condition,a new product with 50％ size reduction compared with other existing products on the market is designed,which can be embedded into other systems such as attendance instrument,safety box,ID card and so on.In addition,the resolution and processing are also improved.With such merits,the fingerprint identification enjoys a higher practical value.%利用人体指纹具有的唯一性,指纹识别系统越来越多地用于各种机密系统,同时,随着嵌入式指纹识别系统的快速发展,其正倾向于变得更小巧、轻便.因此,研制体积小、识别率高的指纹识别系统已经成为了嵌入式指纹识别领域的趋势.通过分解光焦度的设计方法、采用双高斯的对称光学成像结构、利用Scheimpflug条件设计指纹识别系统,其体积是在市面上现有产品体积的基础上减小了50％,且可以嵌入到考勤机,保险柜,二代身份证等等系统当中.在缩小体积的同时也提高了指纹识别系统的识别率.由于这种指纹识别系统体积小、识别率高、易加工等各种优点,很有普及价值.
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