Optical reception apparatus using prism having caldera-shaped concave portion
US5159188A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1991 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Aug 13, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/60
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An optical reception apparatus comprises of a prism made by forming in a member of substantially the frustum of a circular cone made of a transparent material a concave portion of a substantially circular cone or substantially the frustum of circular cone whose diameter is gradually reduced in the direction from a small diameter circular outer side surface to a large diameter circular outer side surface of the frustum of the circular cone, and a light receiving element mounted on the prism at its position along a center line of a circle of the large diameter circular outer side surface and also in the vicinity of the large diameter circular outer side surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.