Laser scanning optical system and laser scanning optical apparatus
US5583342A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 7, 1995 |
| Grant date | Dec 10, 1996 |
| Priority date | — |
| Expiry date | Sep 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0972
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser scanning optical system is so arranged to comprise an optical converting unit, an optical scanning unit, and an optical converging unit. Here, the optical converting unit is composed of two axicon prisms which are arranged such that apexes thereof are opposed forward or backward to each other at a predetermined distance and optical axes thereof are coincident with each other and which are made of respective materials having a same refractive index and shaped with a same apical angle. By this, the laser beam incident into the optical converting unit becomes a cylindrical ray bundle having an annular cross-sectional intensity perpendicular to the optical axis. Therefore, the cylindrical ray bundle is changed in the traveling direction by the optical scanning unit to be scanned and is then converged by the optical converging unit to become a Bessel beam having a high energy utilization factor, a high resolution and a long focal depth.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.