Proximity sensing device and light guiding method thereof
US10982996B2 · kind B2 · utility
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5Claims
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Key dates
| Filing date | Jan 17, 2020 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Jan 17, 2040 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49016
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A proximity sensing device includes: a light source, a sensing unit, a light guide unit, and a window. The light source emits light, which is guided by the light guide unit to the window. The emitted light reflected by an object is received by the same window. The light guide unit includes a partial-transmissive-partial-reflective (PTPR) optical element, whereby the light emitted from the light source is reflected by the PTPR optical element, while the light reflected by the object passes through the PTPR optical element. There is only one window required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.