Retro-reflective photoelectric sensor
US6946643B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 17, 2003 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Mar 20, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V8/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A retroreflective sensor apparatus which includes a light source with a collimating lens and a photoelement with a condensing lens. The light source and the photoelement are positioned adjacent to and offset from each other. A mask is placed between the light source and the collimating lens on a side away from the photoelement to block a portion of the light from the light source from reaching the collimating lens. A method of constructing a retroreflective optical sensor including providing a light source with a collimating lens and a photoelement with a condensing lens. The light source and the photoelement are positioned adjacent to and offset from each other. An opaque mask is placed between the light source and the collimating lens on a side away from the photoelement to block a portion of the light from the light source from reaching the collimating lens. A reflector is positioned to receive light from the light source and reflect it to the photoelement. A retroreflective sensor apparatus in which a mask is placed between the photoelement and the condensing lens on a side away from the light source to block a portion of the light from the light source reflected by the reflect…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.