The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 2011
Filed:
Apr. 25, 2007
Applicant:
Alan James Holloway, Wotton-under-Edge, GB;
Inventor:
Alan James Holloway, Wotton-under-Edge, GB;
Assignee:
Renishaw plc, Wotton-under-Edge, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01B 11/02 (2006.01);
U.S. Cl.
CPC ...
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.