Optical device for semiconductor based lamp

Abstract

This invention discloses an optical device for a semiconductor based lamp, the optical device comprising a base for mounting a semiconductor based light-emitting device thereon, a transparent body encapsulating the semiconductor based light-emitting device, and a reflective surface covering a predetermined region on a top of the transparent body, the reflective surface having an opening exposing the transparent body, wherein light emitted from the semiconductor based light-emitting device transmits through the opening of the reflective surface.

1 . An optical device for a semiconductor based lamp, the optical device comprising:
 a base for mounting a semiconductor based light-emitting device thereon;   a transparent body encapsulating the semiconductor based light-emitting device; and   a reflective surface covering a predetermined region on a top of the transparent body, the reflective surface having an opening exposing the transparent body,   wherein light emitted from the semiconductor based light-emitting device transmits through the opening of the reflective surface.   
     
     
         2 . The optical device of  claim 1 , wherein the semiconductor based light-emitting device comprises at least one light-emitting diode (LED). 
     
     
         3 . The optical device of  claim 1 , wherein the opening is located at approximately a center area of the transparent body. 
     
     
         4 . The optical device of  claim 1 , wherein the transparent body has one or more concave boundaries at the area exposed by the opening. 
     
     
         5 . The optical device of  claim 1 , wherein the transparent body has one or more convex boundaries at the area exposed by the opening. 
     
     
         6 . The optical device of  claim 1 , wherein the transparent body is secured to the base. 
     
     
         7 . The optical device of  claim 1 , wherein the transparent body is made of a material selected from the group consisted of glass and polymer. 
     
     
         8 . The optical device of  claim 1 , wherein the reflective surface further comprises a slanted region that redirects light emitted from the semiconductor based light-emitting device downward. 
     
     
         9 . The optical device of  claim 1 , wherein the reflective surface is formed by plating a reflective material on the surface of the transparent body. 
     
     
         10 . The optical device of  claim 1  further comprising a frosted semi-transparent cover enclosing the base and the transparent body. 
     
     
         11 . An optical device for a semiconductor based lamp, the optical device comprising:
 a base for mounting one or more light-emitting diodes (LEDs) thereon;   a transparent body encapsulating the LEDs; and   a reflective surface covering a predetermined region on a top of the transparent body, the reflective surface having an opening exposing the transparent body,   wherein light emitted from the LEDs transmits through the opening of the reflective surface.   
     
     
         12 . The optical device of  claim 11 , wherein the opening is located at approximately a center area of the transparent body. 
     
     
         13 . The optical device of  claim 11 , wherein the transparent body has one or more concave boundaries at the area exposed by the opening. 
     
     
         14 . The optical device of  claim 11 , wherein the transparent body has one or more convex boundaries at the area exposed by the opening. 
     
     
         15 . The optical device of  claim 11 , wherein the transparent body is secured to the base. 
     
     
         16 . The optical device of  claim 11 , wherein the transparent body is made of a material selected from the group consisting of glass and polymer. 
     
     
         17 . The optical device of  claim 11 , wherein the reflective surface further comprises a slanted region that redirects light emitted from the LEDs downward. 
     
     
         18 . The optical device of  claim 11 , wherein the reflective surface is formed by plating a reflective material on the surface of the transparent body. 
     
     
         19 . The optical device of  claim 11  further comprising a frosted semi-transparent cover enclosing the base and the transparent body.