Lens plate, method for manufacturing the same and image transfer device

Abstract

Spherical convex micro-lenses are arranged between rectangular grooves adjacent to each other of a lens plate. The arrangement of convex micro-lenses is made to be in parallel with the short-side direction of the lens plate, namely, the direction of the rectangular grooves. Since stray light appears mainly on the convex micro-lenses arranged in the long-side direction of the lens plate, the stray light to appear in the long-side direction of the lens plate is removed by forming grooves at regular intervals in the long-side direction of the lens plate and forming a light absorbing film in each of the rectangular grooves. Or the stray light to appear in the long-side direction of the lens plate is removed by making the direction of arrangement of convex micro-lenses different from the long-side direction of the lens plate.

1 . A method for manufacturing a lens plate, comprising the steps of; 
 molding a rectangular plate having a plurality of grooves formed to a specified depth at specified intervals in parallel with one another in the short-side direction of the plate,    forming a plurality of lens rows of convex micro-lenses, said lens rows being formed with said grooves between them at specific intervals in parallel with one another in the short-side direction of the plate on said plate, and    forming light absorbing films in said grooves.    
   
   
       2 . A method for manufacturing a lens plate according to  claim 1 , said method molding said plate by means of an extrusion molding process.  
   
   
       3 . A method for manufacturing a lens plate according to  claim 1 , said method molding said plate by means of an injection molding process.  
   
   
       4 . A method for manufacturing a lens plate according to one of  claims 1  to  3 , said method forming said convex micro-lenses on said plate by transfer-molding from a metal mold.  
   
   
       5 . A method for manufacturing a lens plate according to one of  claims 1  to  3 , said method forming said convex micro-lenses on said plate by means of a hot-embossing method.