Variable magnification copying device
US4420248A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 16, 1981 |
| Grant date | Dec 13, 1983 |
| Priority date | — |
| Expiry date | Mar 16, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B27/526
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A varying magnification copying device of small size and low manufacturing cost in which a region of movement of a zoom lens system for an enlargement copying operation is shared with a region of movement of a half-speed mirror for the equal magnification and reduction copying operations. The zoom lens system is moved along the optical axis thereof by a feed screw rotated by a digitally-controlled stepping motor. The zoom lens system, which includes front and rear frames varying front and rear lens systems, is adjsuted in magnification factor by a cam and cam follower mounted on the rear and front frames, respectively. The cam is rotated by a pinion gear which is engaged with a rack which extends parallel to the feed screw. Movement of the zoom lens system perpendicular to the optical axis is accomplished through a lead cam and cam follower.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.