High-resolution position encoder with image sensor and encoded target pattern
US11061338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Mar 29, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2201/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A position encoder for monitoring position of an object includes a target pattern, an illumination system, an image sensor, and a control system. The illumination system generates (i) a first illumination beam that is directed toward and impinges on the target pattern, the first illumination beam having a first beam characteristic; and (ii) a second illumination beam that is directed toward and impinges on the target pattern, the second illumination beam having a second beam characteristic that is different than the first beam characteristic. The image sensor is coupled to the object and is spaced apart from the target pattern. The image sensor senses a first set of information from the first illumination beam impinging on the target pattern and senses a second set of information from the second illumination beam impinging on the target pattern. The control system analyzes the first set of information and the second set of information to monitor the position of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.