G - Physics – 01 – B
Patent
G - Physics
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B
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G01B 11/26 (2006.01) G01B 9/00 (2006.01) G01M 11/02 (2006.01)
Patent
CA 1090559
ABSTRACT OF THE DISCLOSURE Apparatus for measuring the refractive proper- ties of a sphero-cylindrical lens system of the type utilizing an incident light beam scanned in at a predetermined radius about the central axis of the lens system to provide a refracted beam. A generally opaque mask having an annular transparent portion is positioned in the path of the refracted beam, to eliminate errors caused by deviations in radial height from the scanning radius of the refracted beam as it exits the-lens system due to refraction within the interior of the optical system. A position-sensitive photodetector generates a signal indicative of the instantaneous position in a given plane due to refraction of the portions of the light beam passing through the mask. The photodetector output signal is then processed to provide an indication of the refractive properties. Various embodiments of the mask are also disclosed. Also permutations of the above including pinhole aperture, input light and other detection means is discussed.
299623
Acuity Systems Inc.
Borden Ladner Gervais Llp
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