Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Alan James Holloway0
Date of Patent
June 28, 2011
Patent Application Number
12226972
Date Filed
April 25, 2007
Patent Primary Examiner
Patent abstract
Rotary encoder apparatus is described that comprises one or more readheads and a radial scale. Each of the one or more readheads includes a light emitting portion for illuminating the radial scale and a light detecting portion for detecting interference fringes formed at a readhead analyzer plane. The readhead analyzer plane is tilted relative to the plane containing the radial scale. In a preferred embodiment, the readhead analyzer plane is tilted towards the center of rotation of the rotary encoder apparatus by the angle.
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