Collimated light beam scanning method including curvature of field correction
US4906061A · kind A · utility
10Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 24, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jun 24, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/0005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A laser beam from a laser beam source is applied via a collimator lens to a rotating light deflector, deflected by the light deflector, and applied via an f.theta. lens to a surface to scan the same. The f.theta. lens comprises a single-element lens with its f.theta. characteristics well corrected. To correct the curvature of field by the f.theta. lens, the collimator lens is vibrated in simple harmonic motion along the optical axis thereof, or the laser beam source is vibrated in simple harmonic motion along the optical axis of the collimator lens, in synchronism with the scanning of the surface with the laser beam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.