Light source device and optical engine

Abstract

A light source device includes a plurality of laser modules and a beam combiner. Each laser module includes a first laser diode configured to emit a first laser beam and a second laser diode configured to emit a second laser beam. The beam combiner has a first dichroic mirror region and a second dichroic mirror region. The first dichroic mirror region is configured to transmit the first laser beam going out from the first laser module, and to reflect the second laser beam going out from the second laser module. The second dichroic mirror region configured to transmit the second laser beam going out from the first laser module, and to reflect the first laser beam going out from the second laser module.

What is claimed is: 
     
         1 . An optical engine, comprising:
 at least one light source device configured to emit a plurality of laser beams, each of the laser beams having an elliptical beam shape having a minor axis and a major axis;   a converging lens configured such that the laser beams are incident thereto;   an array toroidal lens configured such that the laser beams passed through the converging lens are incident thereto and including a plurality of toroidal lens regions, each of the toroidal lens regions has a first curvature in a plane that contains a propagation direction of the laser beam and the minor axis and a second curvature in a plane that contains the propagation direction and the major axis, the first curvature being greater than the second curvature; and   an integrator configured such that the laser beams passed through the array toroidal lens are incident thereto.   
     
     
         2 . The optical engine of  claim 1 , wherein a number of toroidal lens region is three or more. 
     
     
         3 . The optical engine of  claim 1 , wherein the integrator comprises a rod integrator or a light tunnel. 
     
     
         4 . The optical engine of  claim 1 , further comprising:
 a spatial light modulator configured to be irradiated with the laser beam having passed through the integrator; and   projection optics configured to project the laser beam having been modulated by the spatial light modulator.   
     
     
         5 . The optical engine of  claim 1 , wherein the light source device includes:
 at least one first laser diode configured to emit a first laser beam; and   at least one second laser diode configured to emit a second laser beam having a wavelength which is longer than a wavelength of the first laser beam.   
     
     
         6 . The optical engine of  claim 5 , wherein the light source device includes a hermetic package housing the first laser diode and the second laser diode. 
     
     
         7 . The optical engine of  claim 5 , wherein the light source device includes a plurality of collimating lenses including at least one first collimating lens configured to be passed through by the first laser beam and at least one second collimating lens configured to be passed through by the second laser beam. 
     
     
         8 . The optical engine of  claim 5 , wherein the light source device includes wiring for connecting the first laser diode and the second laser diode respectively to a plurality of terminals that are electrically independent of each other. 
     
     
         9 . The optical engine of  claim 5 , wherein the light source device includes:
 a plurality of the first laser diodes which are arranged in at least one row; and   a plurality of the second laser diodes which are arranged in at least one row.   
     
     
         10 . The light source device of  claim 5 , wherein the light source device includes at least one third laser diode configured to emit a third laser beam having a wavelength which is between the wavelength of the first laser beam and the wavelength of the second laser beam. 
     
     
         11 . The light source device of  claim 10 , wherein
 the first laser beam comprises a blue laser beam;   the second laser beam comprises a red laser beam; and   the third laser beam comprises a green laser beam.