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:
Feb. 21, 2006
Filed:
Aug. 13, 2002
William G. Thorburn, Whitinsville, MA (US);
Norman J. Tobey, Bedford, MA (US);
Melvin J. J. Teare, Ashland, MA (US);
Douglas A. Klingbeil, Niwot, CO (US);
Ralph A. Kelliher, Newton, MA (US);
William G. Thorburn, Whitinsville, MA (US);
Norman J. Tobey, Bedford, MA (US);
Melvin J. J. Teare, Ashland, MA (US);
Douglas A. Klingbeil, Niwot, CO (US);
Ralph A. Kelliher, Newton, MA (US);
GSI Lumonics Corporation, Northville, MI (US);
Abstract
The disclosed optical encoder includes a scale and a sensor head. The scale includes an optical grating and an optical element. The sensor head includes a light source, a detector array, and an index detector all of which are disposed on a substrate. The scale is disposed opposite the sensor head and is disposed for movement relative to the sensor head. The distance between the scale and the sensor head is selected so that the detector array lies near a talbot imaging plane. The light source emits a diverging beam of light, which is directed towards the scale. Light from the diverging beam of light is diffracted by the grating towards the detector array. Light from the diverging beam of light is diffracted by the optical element towards the index detector. The detector array provides a measurement of the position of the sensor head relative to the scale. The index detector provides a reference measurement of the position of the sensor head relative to the scale.