Computer-generated hologram fabrication process, and hologram-recorded medium
US7046405B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 17, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jan 19, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2240/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A computer-generated hologram fabrication process which reduces loads on computation of interference fringes for an original image including micro-characters. A visually perceivable original image and a visually unperceivable original image (micro-characters) are defined, and sample point sources of light are defined at a low density on the original image and at a high density on the original image. Interference fringes of object light are found on each computation point within a first area on a recording surface, and interference fringes of object light are found on each computation point within a second area on the recording surface. The light sources that become samples are defined at a given pitch on sectional lines obtained by cutting the original images 11 and 12 by a multiplicity of sections (parallel with an XZ plane) located at a given spacing. The section-to-section spacing for the original image 12 is made narrows than that for the original image 11.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.