Illumination apparatus and image pickup apparatus
US8147078B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 4, 2009 |
| Grant date | Apr 3, 2012 |
| Priority date | — |
| Expiry date | Jul 13, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2215/0592
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The illumination apparatus includes a light source, an optical member configured to at least transmit therethrough light from the light source, and a reflective member configured to include a reflective portion which extends closer to the optical member than the light source and reflects the light from the light source to cause the light to enter the optical member. A concave portion is formed, on a light entrance side surface of the optical member, in an outside area located outside a light entrance area where the light reflected by the reflective portion reaches. The concave portion includes a refractive surface refracting light, which is part of the light from the light source and enters the concave portion without being reflected by the reflective portion, toward an exit surface of the optical member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.