Reflective photosensor and semiconductor light emitting apparatus each using micro Fresnel lens
US5130531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1990 |
| Grant date | Jul 14, 1992 |
| Priority date | — |
| Expiry date | Jun 6, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/02325
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a reflective photosensor in which a light emitting element and a light receiving element are disposed in a mold resin, a planar optical element (micro Fresnel lens) including a first lens section for projecting a light emitted from the light emitting element toward a sense object in an external space and a second lens section for introducing a reflection light reflected from the sense object to the light receiving element is arranged in the mold resin. Favorably, the light emitting element is a light emitting diode of an edge emitting type and is set in a posture in which the element lies on its side. A reflection mirror is disposed in the model resin to introduce a light emitted from the light emitting diode to the first lens section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.