Structure of optical sensor having light-emitting element and light-receiving element
US11674893B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2021 |
| Grant date | Jun 13, 2023 |
| Priority date | — |
| Expiry date | Mar 8, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00616
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A housing includes a first opening and a second opening, and encloses a light-emitting element and a first light receiving unit. The first opening is provided in a first light guide path, and is arranged so that light output from the light-emitting element travels toward a target surface. The second opening is provided in a second light guide path arranged between the target surface and the first light receiving unit. The first opening is an exit opening of a through-hole provided penetrating through the housing, and a shape of the through-hole is a shape in which diffracted light of the +1st order and higher orders and diffracted light of the −1st order and higher orders produced at the target surface to be irradiated are not incident on the first light receiving unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.