Diffraction grating and laser television using the same
US7633462B2 · kind B2 · utility
0Cited by
4References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Apr 1, 2005 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Jun 6, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3129
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A diffraction grating including a substrate, and a grating member formed on the substrate, the grating member having a stepped structure including steps, the number of which corresponds to an odd number greater than or equal to three to provide an odd phase structure. The heights of the steps of the grating member are determined such that the light beams diffracted by their corresponding steps substantially have a phase difference of π with reference to a diffracted light beam of a reference wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.