Image sensor having inner lens

Abstract

An image sensor includes an inner lens to enable incident light to reach a condensing lens, so that the incident light may further reach photodiodes. Light loss can be reduced and photosensitivity can be improved. The image sensor includes at least one microlens that focuses incident light onto at least one photosensor that receives a light signal transmitted from the at least one microlens. The image sensor also includes at least one inner lens, disposed between the at least one microlens and the at least one photosensor, having an upper surface of a predetermined curvature to compensate photosensitivity of light received from the at least one microlens.

1 . An image sensor, comprising:
 at least one microlens that focuses incident light onto at least one photosensor that receives a light signal transmitted from said at least one microlens; and   at least one inner lens, disposed between said at least one microlens and said at least one photosensor, having an upper surface of a predetermined curvature to increase photosensitivity to light received from said at least one microlens.   
   
   
       2 . The image sensor of  claim 1 , further comprising:
 a protective oxide layer formed on said at least one inner lens.   
   
   
       3 . The image sensor of  claim 1 , further comprising:
 a color filter portion, disposed between said at least one microlens and said at least one inner lens, that enables a color separation in the transmitted light signal.   
   
   
       4 . The image sensor of  claim 3 , further comprising:
 a protective oxide layer formed between said at least one inner lens and said color filter portion.   
   
   
       5 . The image sensor of  claim 3 , wherein said at least one inner lens is disposed between said color filter portion and the at least one photosensor. 
   
   
       6 . The image sensor of  claim 3 , wherein said color filter portion is part of a color filter array including different color filters that filters transmitted light according to wavelength. 
   
   
       7 - 18 . (canceled)