CAJ | 학술논문

传统的光学式指纹辨识器,为了矫正像差与提升成像品质,会在棱镜的出射面加上一个对称非球面镜(简称传统型),本文提出一个新的指纹辨识器结构(简称改良型),此结构是在棱镜的光源出射面上,加上一片非对称非球面镜.研究过程中,我们使用点光源近似模型进行设计与模拟,并以数字的方式去呈现改良型的成像品质在各方面均优于传统型的指纹辨识器.在改良型架构下,指纹大小范围在 16平方根2 mm 以内,影像对比度皆可达到 0.5 以上,反观传统型架构,离轴两侧的影像对比度降至 0.2 以下.
전통적광학식지문변식기,위료교정상차여제승성상품질,회재릉경적출사면가상일개대칭비구면경(간칭전통형),본문제출일개신적지문변식기결구(간칭개량형),차결구시재릉경적광원출사면상,가상일편비대칭비구면경.연구과정중,아문사용점광원근사모형진행설계여모의,병이수자적방식거정현개량형적성상품질재각방면균우우전통형적지문변식기.재개량형가구하,지문대소범위재 16평방근2 mm 이내,영상대비도개가체도 0.5 이상,반관전통형가구,리축량측적영상대비도강지 0.2 이하.
The optical design of optical prism with aspheric lens for fingerprint identification is researched.We propose a new structure for optical prism of fingerprint identification, which has an asymmetrical as-pheric lens on the output plane. It is numerically shown under point approximate model that the optical properties of such prism are better than one of optical prism with aspheric lens. When the fingerprint range is 16 平方根2 mm, the results show that the image contrast of our proposed prism is above 0. 5 and the minimum image contrast for optical prism with aspheric lens is only 0.2.