Optical holographic scanner
US4747646A · kind A · utility
15Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1987 |
| Grant date | May 31, 1988 |
| Priority date | — |
| Expiry date | Mar 20, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A holographic disc for use in a spot scanning system is formed with diffractive gratings having optical power incorporated therein, thereby eliminating the need for an f-theta lens between the disc and the scanning plane. The disc is formed by rotating it at high speeds to achieve gyroscopic stability and then exposing a recording medium to short pulse superimposed wavefronts, one of which imparts optical power to the grating being formed. The gyroscopic stabilization insures that each grating is located exactly the same radial distance from the disc axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.