Optical encoder

US7449677B2 · kind B2 · utility

Assignee

• Avago Technologies ECBU IP (Singapore) Pte. Ltd. · SG

Inventors

• Kean Foong Ng · Bukit Mertajam, MY
• Sze Kuang Lee · Bayan Lepas, MY
• Hock Aun Tan · Jeniang, MY
• Weng Fei Wong · Bukit Mertajam, MY
• Wee Jin Yeap · Bukit Mertajam, MY
• Chee Foo Lum · Bukit Mertajam, MY
• Kok Fo · Bukit Mertajam, MY
• Toshiya Hataguchi · Yamato, JP
• Randeep Singh A/L Amarjit · Bukit Mertajam, MY

Key dates

• Filing date: Jun 4, 2007
• Grant date: Nov 11, 2008
• Expiry date: Jun 4, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/34707
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An optical encoder includes a code strip having a first side, a second side, a first track comprising indicia thereon, and a second track comprising indicia thereon. The code strip is moveable along a displacement path with respect to the optical encoder. A light source positioned on the first side of the code strip directs light toward the code strip. A first detector element is positioned on the second side of the code strip and is generally aligned with the first track of the code strip. A second detector element is positioned on the second side of the code strip and is generally aligned with the second track of the code strip. The second detector element is also positioned so that the second detector element is located a spaced distance along the displacement path from the first detector element.