Laser illuminating apparatus for illuminating a strip-shaped or linear area
US6845119B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 2002 |
| Grant date | Jan 18, 2005 |
| Priority date | — |
| Expiry date | Jul 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser illuminating apparatus that illuminates a linear or strip-shaped area (S) of sheet material (B) with high radiant power contains a diode laser (2) whose output is followed by two mutually orthogonally oriented rod lenses (4, 6) whose focal length is small in comparison to their distance. Between the two rod lenses (4, 6) a laser light beam fan (L2) is formed. Said fan is focused by the second rod lens (6) on a narrow linear area (S). Behind said area the laser beams diverge at a large angle (α) so that the power density decreases accordingly rapidly. If the light falls on the retina of an observer's eye, the laser light is not focused pointwise but only linearly, which excludes injury to the eye due to the accordingly low power density.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.