Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1993-12-17
1996-07-02
Sikes, William L.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351205, 359205, A61B 310, G02B 2608
Patent
active
055327710
ABSTRACT:
An optical scanner (100) includes a rotating scanner disk (116) that integrates a multifocal Fresnel fixation lens (114), a Fresnel optical scanner (122, 124), and an angular position encoder (140) into a unitary, inherently aligned, compression-molded component. An individual being identified views through the multifocal Fresnel fixation lens an image of a pinhole (108) illuminated by a light source (104). The multifocal lens is centered on the disk and creates multiple in- and out-of-focus images (180, 182, 184, 186) of the pinhole image. The combined image appears to the individual as a set of circular images (190, 192, 194, 196), one of which is in focus. The images appear concentric when the individual is properly aligned with the disk and associated optics. The Fresnel optical scanner receives IR light from the light source and creates an IR scanning beam (126) when the disk is rotated. IR light reflected by the fundus (12) of the individual returns via a reciprocal path, by way of a beam splitter (112), and into a detector (134) to generate image data. The disk integrates and inherently aligns multiple optical elements, resulting in a 60 percent reduction of optical components relative to prior scanners.
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Hill Robert B.
Johnson Joel C.
Dang Hung Xuan
EDI of Louisiana, Inc.
Sikes William L.
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