公开(公告)号：US3501234A

公开(公告)日：1970-03-17

申请号：US3501234D

申请日：1967-12-19

申请人： BRAUN AG

发明人： JOHANNSEN HANS WERNER ,  HOFMANN ERICH

IPC分类号： G03B23/04 ,  G03B23/00

CPC分类号： G03B23/046

公开(公告)号：US3669534A

公开(公告)日：1972-06-13

申请号：US3669534D

申请日：1969-06-27

申请人： BRAUN AG

发明人： HOFMANN ERICH ,  KRULL ERNST ,  JOHANNSEN WERNER HANS ,  OBERHEIM ROBERT ,  SCHEIBEL JOSEF

IPC分类号： G03B23/00 ,  G03B21/00

CPC分类号： G03B23/00

摘要： A SLIDE PROJECTOR AND VIEWER WHEREIN THE HOUSING SUPPORTS A PIVOTABLE INSERT PROVIDED WITH A GATE FOR SLIDES AND CARRYING AN OPTICAL ELEMENT WHICH ACTS AS A MAGNIFYING LENS IN ONE ANGULAR POSITION AND AS A COMPONENT OF A CONDENSING LENS IN ANOTHER ANGULAR POSITION OF THE INSERT. THE PROJECTION LAMP DIRECTS LIGHT THROUGH THE CONDENSING LENS IN THE ONE POSITION OF THE INSERT WHEREBY SUCH LIGHT PASSES THROUGH THE SLIDE IN THE GATE AND THROUGH A PROJECTION LENS SO THAT THE IMAGE OF THE SLIDE IS PROJECTED ONTO A SCREEN. IN THE OTHER POSITION OF THE INSERT, THE OPERATOR CAN LOOK THROUGH THE MAGNIFYING LENS OF THE INSERT AND A SLIDE IN THE GATE TO SEE AN ENLARGED IMAGE BECAUSE THE GATE THAN EXTENDS ACROSS THE PATH OF A SECOND LIGHT SOURCE, EITHER A SEPARATE LAMP OR A REFLECTOR WHICH DIRECTS SOME LIGHT ISSUING FROM THE PROJECTION LAMP AGAINST THE UNDERSIDE OF THE SLIDE.