Optical system for providing visual aid for proper magnification selection
US4244649A · kind A · utility
13Cited by
4References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 24, 1979 |
| Grant date | Jan 13, 1981 |
| Priority date | — |
| Expiry date | May 24, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/6214
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a full-frame, copying system, translucent registration guides along the edges of a platen area provide an operator with an indication of which portion of a document overlying the platen will be copied onto selected copy paper at the particular magnification ratio selected. Illumination sources located on the image side of a projection lens create line images which are projected through the lens to illuminate appropriate registration guides corresponding with the particular magnification ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.