Variable magnification copying apparatus
US5337121A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1993 |
| Grant date | Aug 9, 1994 |
| Priority date | — |
| Expiry date | Mar 12, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable magnification copier apparatus includes an optical system which incorporates two pairs of moving mirror assemblies which are moved to maintain object and image conjugate requirements following magnification changes. Also included is a constant focal length lens movable between two segments of a folded optical path. The optical system provides a magnification range of between 0.45X and 2.0X, while positioning the optical elements in a compact design. The lens does not move along the optical path, but rather remains fixed in position along one path segment so long as magnification values are selected within a certain range. When the magnification value is selected outside the predetermined range, the lens moves to an adjacent segment of the optical path and remains in a second, fixed position so long as further magnification values are selected within a second range. When a range is selected outside the second range, the lens is moved back to the first position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.