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:
Sep. 04, 2007
Filed:
Dec. 01, 2003
Toshiya Hataguchi, Bessho Hachiouji, JP;
Yee Loong Chin, Taman Pinji Mewah, MY;
Kok Hing Fo, Kampung Benggali, MY;
Srinivasan Lakshmanan, Greenlane, MY;
Lai Hing Chua, Persiaran Batu Uban, MY;
Toshiya Hataguchi, Bessho Hachiouji, JP;
Yee Loong Chin, Taman Pinji Mewah, MY;
Kok Hing Fo, Kampung Benggali, MY;
Srinivasan Lakshmanan, Greenlane, MY;
Lai Hing Chua, Persiaran Batu Uban, MY;
Avago Technologies ECBU IP (Singapore) Pte. Ltd., Singapore, SG;
Abstract
An encoder for measuring the position of a rotating shaft is disclosed. The encoder includes a drum having an encoding track thereon and a detector module having a light source and a photodetector. The drum includes a cylindrical surface characterized by an axis, the drum having a surface with a normal perpendicular to the axis. The encoding track includes a plurality of alternating reflective and non-reflective stripes arranged on the cylindrical surface. The first light source illuminates the stripes at an opaque angle relative to the normal. The first photodetector is positioned to receive light from the light source that is reflected from the reflective stripes when the drum moves relative to the photodetector. In one embodiment, the drum rotates about the axis when the shaft rotates. The encoding track can be either on the inside or outside of the drum.