Bi-curvature lens for light emitting diodes and photo detectors

Abstract

A bi-curvature lens for diodes in an infrared wireless communication transceiver is disclosed. Devices having such a bi-curvature lens, such as a light emitting device, a light detecting device, and a transceiver are also disclosed. A method for designing such a lens, and a method for fabricating a device having such a lens are also disclosed. The bi-curvature lens disclosed has a bottom hemispherical portion and a top aspherical portion. Light emitting diodes and photo detectors used in conjunction with bi-curvature lenses display symmetrical radiation intensity profiles, in accordance with Infrared Data Association standards and protocols.

1 . A light detecting device comprising: 
 a photo detector; and    a bi-curvature dome lens comprising: 
 a hemispherical portion comprising a first radius; and  
 an aspherical portion comprising a second radius and a conic constant not equal to zero.  
   
   
   
       2 . The light detecting device of  claim 1  wherein said photo detector is a photo detector chip, wherein said photo detector chip is embedded in said bi-curvature dome lens.  
   
   
       3 . The light detecting device of  claim 1  wherein said photo detector is a photo detector die, wherein said photo detector chip is embedded in said bi-curvature dome lens.  
   
   
       4 . A method of detecting light comprising: 
 transmitting light through a bi-curvature lens, said lens comprising a first hemispherical portion and a second aspherical portion; and    receiving light at a photo detector.