DEVICE FOR SHORT-DISTANCE PROJECTION AT A REASONABLY LARGE ANGLE WITH ZOOM AND FOCUSING,申请号US201113574658-传众专利搜索

DEVICE FOR SHORT-DISTANCE PROJECTION AT A REASONABLY LARGE ANGLE WITH ZOOM AND FOCUSING

申请公布号：US2012327508(A1)

申请号：US201113574658

申请日期：2011.01.11

申请公布日期：2012.12.27

申请人：

BENOIT PASCAL;DUBROCA GUILHEM;SARAYEDDINE KHALED

发明人：BENOIT PASCAL;DUBROCA GUILHEM;SARAYEDDINE KHALED

分类号：G02B17/08

主分类号：G02B17/08

摘要：The invention proposes a short-distance front projection system, that is to say with a wide angle, occupying a small volume and offering a possibility of focusing as well a zoom function. It makes it possible to obtain images with a diagonal greater than 2 metres, the whole of the optical system being at least 50 cm from the plane of the image. This projector is constructed on the basis of three optical elements: an ocular, an afocal lens system and a final group forming an objective intended to form the intermediate image in front of the mirror.