Side-illuminated target structure having uniform ring illumination
US6802131B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2002 |
| Grant date | Oct 12, 2004 |
| Priority date | — |
| Expiry date | Sep 5, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An illuminated target structure for viewing a scene includes a transparent medium having a transparent-medium peripheral rim and a light-reflective target within a transparent-medium central region. A circumferentially uniform ring illumination source is in contact with the transparent-medium peripheral rim. The ring illumination source projects a substantially uniform illumination into the transparent-medium peripheral rim and thence onto the light-reflective target. The ring illumination source preferably is a modified optical fiber structure having a modified lateral surface in facing relation to the transparent-medium peripheral rim and having a light leakage through the modified lateral surface. An image intensifier may be positioned in facing relation to a transparent-medium front face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.