G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 15/00 (2006.01) A61F 9/01 (2006.01) G02B 26/08 (2006.01) G02B 27/00 (2006.01) A61B 3/113 (2006.01) A61F 9/008 (2006.01)
Patent
CA 2426416
A zooming mechanism for use in an eye tracking system includes a pyramidal prism that has either a plurality of reflective facets or of transmissive facets meeting at an apex. An incident light beam directed onto each facet of the prism is reflected/refracted onto a planar surface substantially normal to the optical axis, to form a plurality of light spots arrayed about an optical axis. The prism is translatable along the optical axis between axial positions for altering a spacing of the light spots without substantially changing their size. Preferably the spots are directed onto a boundary defined by two adjoining surfaces of the eye having different coefficients of reflection. Reflected energy from each of the plurality of positions is detected, and a size of a pattern formed by the light spots is adjustable without substantially changing a diameter of the individual light spots.
Nguyen Phuoc Khanh
Zepkin Neil
Alcon Inc.
Kirby Eades Gale Baker
LandOfFree
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