Multi-magnification short focal length imaging system
US4678311A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1986 |
| Grant date | Jul 7, 1987 |
| Priority date | — |
| Expiry date | Mar 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0043
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multi-magnification, short focal length imaging system is enabled by providing a lens assembly having a plurality of short focal length lens arrays formed within a unitary plastic or glass body. The lens arrays are composed of a plurality of lenslets formed by either a masking/radiation heat treating process when using a photosensitive glass or by plastic injection molding techniques. The lenslets are formed with the appropriate spacing parameters and lens axis tilt orientation to enable projection of a reduced or enlarged image of a document at an image plane. The lens assembly is translated and/or rotated in response to magnification reproduction values selected by an operator so as to place the appropriate lens array into an optical projection path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.