Lighting unit
US4355349A · kind A · utility
2Cited by
1References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1980 |
| Grant date | Oct 19, 1982 |
| Priority date | — |
| Expiry date | Jul 10, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB64F1/18
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A lighting unit for a glide path lighting system comprises a light source, a lens, and a colored interference filter part way across the light path between the light source and the lens, arranged so as to produce a light beam having a white part, a colored part and a transition region. The filter is inclined at an angle of approximately 6.degree. to a plane normal to the optical axis of the unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.