Resin-cemented optical element, mold therefor, fabrication process thereof, and optical article

Abstract

NK1717 The present invention provides a resin-cemented optical element comprising a base member 10 and a resin layer 11 formed on the surface of the base member; the resin layer 11 being in a thickness of 300 μm or smaller at least at some part of a peripheral portion (i.e., a region within 1 mm from the peripheral edge face 17 of the resin layer 11, or a region outside an effective-diameter region), and being in a thickness 12 of 850 μm or larger at a position which is thickest in the resin layer; a mold therefore; a manufacturing method thereof; and an optical article having this optical element.

We claim:  
     
         1 . A resin-cemented optical element comprising a base member and a resin layer formed on a surface of the base member, wherein: 
 said resin layer is in a thickness of 300 μm or smaller at least at a part of a region within 1 mm from the peripheral edge face of the resin layer; and    said resin layer is in a thickness of 850 μm or larger at a position which is thickest in said resin layer.    
     
     
         2 . The resin-cemented optical element comprising a base member and a resin layer formed on a surface of the base member, wherein: 
 said resin layer is in a thickness of 300 μm or smaller at least at a part of a region outside an effective-diameter region; and    said resin layer is in a thickness of 850 μm or larger at a position which is thickest in that layer.    
     
     
         3 . The resin-cemented optical element according to  claim 2 , wherein: 
 at least at a part of the region outside an effective-diameter region,    said resin layer has a thickness which becomes gradually smaller toward the periphery.    
     
     
         4 . A mold for molding a resin layer of a resin-cemented optical element having a base member and said resin layer formed on the surface of the base member, wherein 
 said mold has, on the outer periphery on the outside of a molding surface, a concavely curved surface which has a curvature larger than the molding surface.    
     
     
         5 . An optical article comprising the resin-cemented optical element according to  claim 1 .  
     
     
         6 . An optical article comprising the resin-cemented optical element according to  claim 2 .  
     
     
         7 . An optical article comprising the resin-cemented optical element according to  claim 3 .  
     
     
         8 . A fabrication process for a resin-cemented optical element having a base member and a resin layer formed on the surface of the base member, comprising, 
 a step of molding said resin layer with a mold having, on the outer periphery on the outside of a molding surface, a concavely curved surface which has a curvature larger than the molding surface.