Light diffraction method and diffraction device, diffraction grating used for them, and position encoder device
US7466487B2 · kind B2 · utility
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15Claims
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Key dates
| Filing date | Jul 1, 2004 |
| Grant date | Dec 16, 2008 |
| Priority date | — |
| Expiry date | Mar 16, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/4277
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A principle of blazing that is effective even in the resonance domain. Light (51) is made incident on a diffraction grating so that specular resonance can occur in two or more light scattering units including, for example, bispheres (11a, 21a; 12a,22a), and by the specular resonance, a fraction of diffracted light 52 that is diffracted by the first layer (1) and the second layer (2) is selectively enhanced. It also becomes possible to tune a blazing condition by a control signal from outside.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.