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1. 发明申请

US20080298650A1 Optical finger print acquisition apparatus using a prism 审中-公开
标题翻译：光学指纹采集装置采用棱镜
公开(公告)号：US20080298650A1
公开(公告)日：2008-12-04
申请号：US11826055
申请日：2007-07-12
申请人： Dong Hyuk Jang , Kum Yong Hwang , Seok Joon Yoon
发明人： Dong Hyuk Jang , Kum Yong Hwang , Seok Joon Yoon
IPC分类号： G06K9/00
CPC分类号： G06K9/00046
摘要： An optical fingerprint acquisition apparatus using a prism, which can improve the quality of a fingerprint image acquired by an image sensor, is provided. The optical fingerprint acquisition apparatus using the prism includes a pentagon prism including an input face 11 which receives a beam, a first support face 12 which is extended from one end of the input face 11, a contact face 13 which is obliquely extended from one end of the first support face 12 at a first tilt angle a1 and is horizontal to the input face 11, a second support face 14 which is extended from one end of the contact face 13, and an output face 15 which is vertically extended from one end of the second support face 14 and extended from another end of the input face 11, wherein, when the beam illuminated to the input face 11 is illuminated to the contact face 13 with which a finger F contacts, the beam is scattered in ridges F1 of fingerprint and is reflected in valleys F2 of fingerprint and thereby illuminated to the output face 15, a light source 20, an imaging lens 30, and an image sensing unit 60 including a lens unit 40 which is provided to receive the beam illuminated to the imaging lens 30 so as to correct a distortion of the beam and prevent an undesired beam, and a sensor unit 50 which includes an image sensor 53 to receive the illuminated beam and thereby acquire a fingerprint image at a second tilt angle a2.
摘要翻译：提供一种使用棱镜的光学指纹获取装置，其可以提高由图像传感器获取的指纹图像的质量。使用棱镜的光学指纹获取装置包括：五边形棱镜，其包括接收光束的输入面11，从输入面11的一端延伸的第一支撑面12，从一端倾斜延伸的接触面13 第一支撑面12处于第一倾斜角度a1并且与输入面11水平，从接触面13的一端延伸的第二支撑面14和从一端垂直延伸的输出面15 的第二支撑面14的延伸并且从输入面11的另一端延伸，其中，当照射到输入面11的光束被照射到与手指F接触的接触面13时，光束被散射在脊部F1 指纹，并被反射在指纹的谷F2中，从而照射到输出面15，光源20，成像透镜30和图像感测单元60，该透镜单元40被设置成接收光束相对于成像透镜30，以校正光束的失真并防止不期望的光束，以及包括图像传感器53的传感器单元50接收照射光束，从而以第二倾斜角度a2获取指纹图像。

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