提出了一种采用波导全息元件和CMOS图像传感器的指纹采集器。通过分析消失场和全息光栅在波导全息指纹采集中的作用,设计了新型结构的波导全息指纹采集器。实验结果表明,设计的指纹采集器具有更高的图像分辨率和对比度,由于省去了传统光路中的透镜,大大减小了采集器的体积和重量。

An optical fingerprint entry device based on waveguide hologram and CMOS image sensing was proposed. The new waveguide-hologram fingerprint entry device was designed by analysis of the effects of evanescent wave and hologram grating during fingerprint capturing process. Experimental results show that the image captured by the device has higher resolution and contrast. The size and weight of the fingerprint entry device are minimized greatly by omitting the lens in the traditional optical path.