Uniform illumination optical device with a concave lens
US6400510B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 30, 2001 |
| Grant date | Jun 4, 2002 |
| Priority date | — |
| Expiry date | Aug 30, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A uniform illumination device satisfies the demands of having a short optic path, a smaller beam size, and desired parallel beams. The uniform illumination device has a beam splitting device for converting light from a light source into a plurality of parallel beams, and a beam condenser for condensing the parallel beams to form a more uniform condensed light. The beam condenser has a first condensing lens made of a convex lens, and a second condensing lens made of a concave lens. When the parallel beams transmitted from the beam splitting device pass through the first condensing lens of the beam condenser, the parallel beams converge to the central axis. When the parallel beams pass through the second condensing lens, the parallel beams converge towards axes that are parallel with the central axis. The parallel beams transmitted from the beam splitting device are mixed to form the more uniform condensed light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.