Remotely illuminated transparent holographic stoplight for automobiles
US4916593A · kind A · utility
20Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 4, 1989 |
| Grant date | Apr 10, 1990 |
| Priority date | — |
| Expiry date | Jan 4, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2270/21
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A holographic stoplight assembly including a volume hologram having a recorded stoplight image secured adjacent to the inside surface of an automobile window. The volume hologram is selectively illuminated by an illumination source located out of the driver's rearward field of vision and forward of the hologram. Also disclosed is a method for recording a hologram for use in a holographic automobile stoplight system which includes the steps of recording the image of a stoplight in a first hologram, and then recording in a second hologram the playback image of the first hologram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.