Refractive optics and projection display apparatus
US8641208B2 · kind B2 · utility
5Cited by
5References
9Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Apr 1, 2011 |
| Grant date | Feb 4, 2014 |
| Priority date | — |
| Expiry date | Apr 20, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/28
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Disclosed are a projection display apparatus and a projection optics provided in the projection display apparatus. The projection optics has a refractive optics and a reflective optics. In the refractive optics, a lens (non-circular lens) provided on a reflective optics side has a non-circular shape forming part of an imaginary circular region whose center is an optical axis center of the refractive optics. In other words, the non-circular lens has a shape of a cut-out portion of an imaginary circular lens having an optical axis center coinciding with the optical axis center of the refractive optics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.