Single dome lens reflective optical encoder

US7795576B2 · kind B2 · utility

Assignee

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

Inventors

• Yee Loong Chin · Batu Gajah, MY
• Weng Fei Wong · Bukit Mertajam, MY
• Wee Jin Yeap · Bukit Mertajam, MY
• Cheng Kwong Cheang · Bukit Mertajam, MY

Key dates

• Filing date: Dec 23, 2008
• Grant date: Sep 14, 2010
• Expiry date: Dec 23, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B19/0085
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Disclosed are various embodiments of high-speed, high-performance, low-noise optical encoders having various means for preventing undesired stray light from reaching light detectors incorporated therein. Structures employed to block stray light in the optical encoders include light barriers, air gap trenches, and coatings disposed between first and second sides of a substrate of the encoder. Also disclosed are compact single track optical encoders having a single dome lens disposed thereover, and dual track triple dome lens optical encoders. Methods of making such optical encoders are also disclosed.