Enhanced optical reflective encoder

Abstract

An optical encoder and optical encoding system are disclosed. Specifically, an encoder having a light detector elevated relative to a light source is described. The relative height difference between the light source and the light detector enables the optical encoder to minimize noise at the light detector without requiring a separate light baffle between the light source and light detector. Methods of manufacturing and operating such an encoder are also described.

Description

technical field [0001] The present disclosure relates generally to encoders, and more particularly to optical encoders. Background technique [0002] Encoders are motion detectors that provide closed-loop feedback to a motor control system. A typical optical encoder design includes an emitter / detector module, which can be designed in a transmissive, reflective, or imaging configuration. When operating in conjunction with a code wheel or code tape, the encoder converts rotary or linear motion into two or three channel digital outputs as appropriate. [0003] Figure 1A A transmissive encoder is depicted. In this transmissive configuration, the encoder includes a light source 108 that transmits light through a code wheel or code strip 104 , and the light that passes through the code wheel or code strip 104 is detected at a light detector 112 . [0004] Figure 1B A reflective encoder is depicted. In this reflective configuration, light source 108 emits light toward codewh...

AI Technical Summary

Problems solved by technology

[0009] It would be desirable to provide an encoder, in particular a reflective encoder, which also solves the stray light / noise problems of prior art reflective encoders without the need for additional bezel components

In particular, the inclusion of light shielding components into the encoder requires specialized machinery that is very expensive and adds an extra step to the manufacturing process, which adds time and expense to the manufacturing process

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