Photo coupler
US7492025B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2007 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Mar 22, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/183
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photo coupler includes a semiconductor laser, a semiconductor light-receiver, a resin protector, a reflective film, a light pipe, and electrodes. The light pipe is made of resin, has a rectangular parallelepiped shape, and is provided so as to surround an outer circumferential portion of the semiconductor light-receiver. On a center portion of an upper surface of the light pipe, a recessed portion shaped in a frustum of quadrangular pyramid tapered toward the semiconductor light-receiver is formed. The reflective film is shaped in a frustum surface of pyramid tapered toward the semiconductor light-receiver, and is formed on side surfaces of the recessed portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.