Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
January 6, 2009
Patent Application Number
11206974
Date Filed
August 19, 2005
Patent Primary Examiner
Patent abstract
A position measurement system includes a photographing unit and an arithmetic processing unit. The photographing unit has a lens and a light-receiving element. The lens forms an optical ring image from light from a light source through spherical aberration. The light-receiving element detects the optical ring image formed by the lens. The arithmetic processing unit measures a distance to the light source on the basis of the quantity of light of the optical ring image detected by the light-receiving element.
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