Patent · US Active

High performance reflectivity optical encoder with a protrusion between lenses

US7317183B2 · kind B2 · utility

4Cited by

1References

10Claims

0Family size

Assignee

Avago Technologies ECBU IP Pte. Ltd. · SG

Inventors

Weng Fei Wong · Bukit Mertajam, MY
Yee Loong Chin · Batu Gajah, MY
Siang Leong Foo · Bukit Mertajam, MY

Key dates

Filing date	Apr 21, 2006
Grant date	Jan 8, 2008
Priority date	—
Expiry date	Aug 24, 2026

Classification

Technology area (CPC G)Physics
CPC primaryG01D5/34707
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An optical encoder includes an emitter, a first lens, a detector, a second lens, and a protrusion. The emitter emits light which is directed by the first lens to a code scale for reflection. The reflected light is directed by the second lens to the detector. The detector detects the reflected light from the code scale. The protrusion is between the first lens and the second lens. The protrusion defines at least one surface that refracts stray light from the emitter away from the detector. Accordingly, the stray light does not reach the detector; thus the detector can operate more effectively.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.