Prism, particularly for optical data communication

Abstract

The prism, which is used particularly for optical data communication by means of a modulated light beam, is furnished with a transmissive prism body ( 60 ) which has two triangular first side faces ( 69 ) on its outer side and a base surface ( 77 ) therebetween, and two second side faces rising up from the base surface and inclined toward one another as light incidence and light exit faces ( 74, 76 ). The two second side faces ( 74, 76 ) are inclined oppositely, relative to an axis ( 79 ) running parallel to the base surface ( 77 ) and penetrating the planes in which the first side faces ( 69 ) lie, and each run at an acute angle ( 78, 80 ) to the axis ( 79 ) such that reflection radiation is reflected to the side.

1 . A prism, particularly for optical data communication by means of a modulated light beam, comprising
 a transmissive prism body which has two triangular first side faces on its outer side and, between said first side faces, a base surface and two second side faces rising up from the base surface and inclined toward one another as light incidence and light exit faces,   said second side faces being inclined oppositely, relative to an axis running parallel to the base surface and penetrating the planes in which the first side faces lie, and each running at an acute angle to the axis in such a manner that reflection radiation is reflected to the side.   
     
     
         2 . The prism according to  claim 1 , characterized in that wherein the second side faces are anti-reflective. 
     
     
         3 . The prism according to  claim 1 , wherein the respective acute angle of inclination is in the range from a few 1/10 angular degrees to a few tens of angular degrees. 
     
     
         4 . The prism according to  claim 1 , wherein the second side faces, when viewed in the projection onto one of the first side faces, extend at an angle of 90°. 
     
     
         5 . The prism according to  claim 1 , wherein the respective acute angle of inclination is in the range from an angular degree of 0.1 to 15 angular degrees 
     
     
         6 . The prism according to  claim 1 , wherein the respective acute angle of inclination is in the range from 2 angular degrees to 5 angular degrees. 
     
     
         7 . The prism according to  claim 4 , wherein the second side faces, when viewed in the projection onto one of the first side faces, have the same length.