Document scanner
US4346984A · kind A · utility
6Cited by
14References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 20, 1980 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Oct 20, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/526
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lead screw is provided to move two or more document scanning elements at separate and differing rates of speed. In a preferred embodiment the lead screw consists of two threaded segments, each segment having a length and pitch which provides a 2:1 ratio of travel to a scan element threadingly engaged therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.