Rotating mirror optical scanner with flat scan and linear scan rate
US4155620A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1977 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Sep 15, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B26/0816
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical scanning system in which a focused light beam is scanned across an image plane by a rotating or reciprocating scan mirror and wherein the field curvature of the focused light beam is substantially reduced by moving the point of intersection between the optic axis of the scanning light beam and the scan mirror as a function of the rotation or reciprocation of the scan mirror and wherein movement of that point of intersection is controlled by having the distance R between the mirror and its point of rotation or reciprocation and the distance h between the image plane and the point of intersection of the optic axis of the scanning beam and the scan mirror approximate the relationship R=2.sqroot.2h. In the case of the scan mirror having a reciprocating movement, the optical scanning system compensates for non-linearity in the sweep of the scanning light beam across the image plane by utilizing a non-linear lever system to reciprocate the scan mirror.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.