Optocoupler apparatus with reflective overcoat
US5150438A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 29, 1991 |
| Grant date | Sep 22, 1992 |
| Priority date | — |
| Expiry date | Jul 29, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4295
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A technique for encapsulating an optocoupler apparatus to improve light coupling efficiency, reliability and cost. An optocoupler apparatus comprises a light emitting device (10) and a light detecting device (11) mounted to conductors (12A,12B). A light coupling material (14) surrounds the optocoupler apparatus. The light coupling material (14) is an electrical dielectric which is transparent to light. A portion of the light coupling material (14) is coated with a light reflective material (16). The light reflective material (16) is a mixture of the light coupling material (14) and titanium dioxide. The benefit of coating the light coupling material (14) with the light reflective material (16) is the two materials have similar chemical properties, and the reflective property of the light reflective material (16) arises from the titanium dioxide; the second most reflective material available. An encapsulating material (17 or 19) further envelops the encased optocoupler apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.