手成像装置光源导光组件研究

Study of Hand Imaging Device Light Source Light Guide Assembly

为解决现有非接触式掌纹采集装置光源面积过大,实用性差的缺点,本文提出一种改进光源模型,设计摄像头与蓝光LED按3×3阵列排列,以减少光源数量及所占面积,并通过在光源上方加装导光组件,扩大光源照射范围并提高照度均匀性,从而捕捉到满足识别要求的完整全手图像。利用Lighttools软件仿真可知,导光组件对照度均匀性均有较大改善。

To solve the oversize area of non- contact palmprint colleting device and poor practicability,this paper proposed an improved light source model. Designing a camera and 8 blue LED as 3 * 3 array,to reduce the number and area of the light source. By installing light guide assembly above the light source,scope of the illuminant is expanded and the intensity of illumination uniformity is improved to capture the full hand image which satisfied with the requirement of recognition. The simulation result by Lighttools shows that the light guide assembly improves the intensity of illumination uniformity.