Optical device for printing planar objects
US4353616A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 13, 1980 |
| Grant date | Oct 12, 1982 |
| Priority date | — |
| Expiry date | Feb 13, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/54
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention relates to an optical printing device with unity magnification using coherent light and making it possible to significantly reduce speckle on the print. It relates to a printing device comprising a device for illuminating the object, a device receiving the object wave and in real time restoring a wave phase conjugate with the object wave to form a real image of the object. The printing device also comprises a photosensitive support placed in the image plane. The object illuminating device forms on the object to be reprinted a lighting spot which is of small size compared with the object, and the printing device also comprises scanning means for completely scanning the object a number of times by the lighting spot so as to superimpose a large number of images of the same zone having uncorrelated noises on the photosensitive support. The invention, more particularly, finds application in the printing of high resolution masks and large surface areas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.