Light beam detection utilizing hologram
US5220409A · kind A · utility
56Cited by
11References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Dec 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0421
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Light beam detection is taught in method and apparatus where a light source of coherent light is directed toward a reflecting hologram made to simulate a parabolic mirror to generate light beams detected by photoreceptors along one side of an opto-frame, such receptors being scanned in a manner to preclude false detection of an object within the field of light. An an alternative, multiple light sources are used with a single receptor and an appropriate hologram.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.