User navigation device with a code wheel and an encoder

US7732756B2 · kind B2 · utility

Assignee

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

Inventors

• Chee Foo Lum · Bukit Mertajam, MY
• Weng Fei Wong · Bukit Mertajam, MY
• Siang Leong Foo · Bukit Mertajam, MY

Key dates

• Filing date: Nov 1, 2006
• Grant date: Jun 8, 2010
• Expiry date: Jan 23, 2027

Classification

• Technology area (CPC G): Physics
• CPC primary: G01D5/3473
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A user navigational apparatus. The user navigational apparatus includes a code wheel and an encoder. The code wheel is coupled to a dial. The code wheel includes a track of alternating reflective and non-reflective sections. The optical reflective encoder includes an emitter and a detector. The emitter generates a light signal incident on the track of the code wheel. The detector detects a reflected light signal. The reflected light signal corresponds to a portion of the incident light signal that is reflected off of the reflective sections of the track. The detector also generates a channel signal corresponding to the reflected light signal. Embodiments of this type of user navigational apparatus achieve reduced thickness compared to conventional implementations of jog wheels.