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    • 4. 发明授权
    • Elliptical finger press scanner with rotating light source
    • 带旋转光源的椭圆形手指按压扫描仪
    • US4684802A
    • 1987-08-04
    • US830650
    • 1986-02-18
    • Paul A. HakenewerthAspi B. WadiaJames R. WalkerJames M. White
    • Paul A. HakenewerthAspi B. WadiaJames R. WalkerJames M. White
    • A61B5/117G02B26/10G06T1/00H01J3/14G06K9/00
    • A61B5/1172
    • A scanner for scanning an increased area of a finger held or pressed on a concave elliptically cylindrical surface having two focal axes includes a linear light source positioned at one focal axis of a first reflective cylindrical elliptical surface, the other focal axis coinciding with one focal axis of the concave elliptical surface in contact with the finger. A second reflective, cylindrical elliptical surface has two focal axes where one of the axes coincides with the position of a linear array combination of photosensitive elements and charged coupled devices and the other coincides with the other focal axis of the concave elliptical surface in contact with the finger. The linear light source resides within a scanning drum having a longitudinal opening or slit and suitable rotated whereby a line of light is projected along the cylindrical elliptical surface of the first reflective surface whereby light rays are reflected to the finger contact surface to scan a finger held thereon and then totally internally reflected to the second reflective surface and then reflected therefrom as an image on the linear array.
    • 用于扫描保持或按压在具有两个焦轴的凹形椭圆柱形表面上的手指的增加区域的扫描仪包括位于第一反射圆柱形椭圆表面的一个焦点轴线处的线性光源,另一个焦点轴线与一个焦点轴线重合 的凹形椭圆表面与手指接触。 第二反射圆柱形椭圆表面具有两个焦点轴,其中一个轴与感光元件和带电耦合器件的线性阵列组合的位置重合,另一个与凹形椭圆表面的另一个焦点轴线接触, 手指。 线性光源位于具有纵向开口或狭缝的扫描鼓中,并适当地旋转,由此一线光沿着第一反射表面的圆柱形椭圆表面突出,由此光线被反射到手指接触表面以扫描手指保持 然后全部内反射到第二反射表面,然后作为在线性阵列上的图像反射。