Fine grating and mold therefor
US8649096B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 22, 2006 |
| Grant date | Feb 11, 2014 |
| Priority date | — |
| Expiry date | Oct 30, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB81B2201/047
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention provides a mold with which a two-dimensional subwavelength grating can be produced with a higher percentage transfer by injection molding and a two-dimensional subwavelength grating having a high aspect ratio produced with such a mold. The mold for a fine grating according to the present invention has protrusion parts (107) arranged at an interval on the bottom face (103) of a cavity, wherein the interval is a distance between centers of the protrusion parts and a period of the fine grating smaller than wavelengths of visible lights. In one embodiment, a cross-section of the protrusion parts, parallel to the bottom face of the cavity decreases with height along the protrusion parts and a decreasing rate of the cross-section increases with height along the protrusions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.