Optical scanning apparatus
US5831749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1996 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Dec 2, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/193
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical scanning apparatus including a first optical unit and a second optical unit used to illuminate a document and direct the reflected light via a lens unit to the light sensing device; a movement mechanism used to move the first and second optical units in such a way that the optical path from the light source to the lens unit is always a fixed length. The movement mechanism includes a first driving unit having a first driving wheel, a first passive wheel, and a first transmission member coupling the first driving and passive wheels and affixed to the first optical unit; a second driving unit having a second driving wheel, a second passive wheel, and a second transmission member coupling the second driving and passive wheels and affixed to the second optical unit; and a driving motor. The diameter of the first driving wheel is of a predetermined multiple of that of the second driving wheel such that the optical path from the light source to the lens unit is always a fixed length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.