Indicator lamp having a converging lens

Abstract

It is sought to provide an indicator lamp, which is excellent not only in short distance visual recognition property but also in long distance one, as well as being further excellent in sight field angle property. An indicator lamp includes a light-emitting element 1 and a light-emitting element lens 2 having a light-emitting element mounting cavity 3 formed at the bottom, in which the light-emitting element disposed in the cavity 3 emits light to be fully reflected by the peripheral surface of the lens 1 and proceeds as emission light flux forwardly of the lens 1 . The slope angle of the peripheral surface with respect to the lens axis is reduced progressively from the bottom toward the lens front surface 5 in three stages, thus forming circumferential corners 7 and 8 as boundaries between adjacent ones of the three stages. The circumferential corners scatter light emitted from the light emitting element 2 to provide concentric emission light fluxes as viewed from the side of the lens front.

1 . An indicator lamp comprising:
 a light-emitting element;   a lens body having a cavity extending from a rear of said lens body, said cavity having a substantially cylindrical front portion, said cavity including a rear portion having a diameter greater than that of said front portion and being defined by a stepped extension surface, said stepped extension surface being tapered radially outwardly and toward a front of said lens body, a front surface of said cavity being convex and projecting toward a front surface of said lens body, said light-emitting element being arranged with said cavity; and   a full reflection lens disposed atop said light-emitting element within said cavity, said light-emitting element emitting light to be reflected by said full reflection lens and proceed forwardly of said full reflection lens, said full reflection lens including a convex lens portion being disposed atop said light-emitting element, said convex lens portion being formed by filling a transparent polymer material into a frame disposed so as to surround said light-emitting element from above said frame so as to be raised in a convex shape.   
   
   
       2 . The indicator lamp according to  claim 1 , wherein said frame is made of a transparent material.