Light source device

Abstract

The present invention provides a light source device which is safe for human eyes and whose switching is performed at high speed. The light source device comprising one or more laser light source 1 for monochromatically or polychromatically emitting, a diffuser 3 (transmissive, reflective or mixture) for diffusing the light bundle injected directly from the laser light source 1 or via the optical focusing system 2 , and the optical system 4 which is referred to as a collimator for collimating the diffused light bundle emitted from the diffuser 3.

1 . A light source device comprising: 
 a laser light source;    diffuser for diffusing a light emitted from said laser light source; and    a collimator for collimating a light diffused by said diffuser and emitting the light.    
   
   
       2 . The light source device according to  claim 1 , including an optical focusing system for focusing a light emitted from said laser light and making said diffuser inject the light.  
   
   
       3 . The light source device according to  claim 1 , wherein said diffuser is any one of a transmissive diffuser for transmitting and diffusing an incident light, a reflective diffuser for reflecting and diffusing an incident light, or a mixture diffuser which combines said transmissive diffuser and said reflective diffuser.  
   
   
       4 . The light source device according to  claim 1 , wherein said diffuser is situated on a plane having normal having an incident light direction and an optional angle from said laser light source.  
   
   
       5 . The light source device according to  claim 2 , wherein said diffuser, said collimator and said optical focusing system are constituted in an integrated manner.  
   
   
       6 . The light source device according to  claim 5 , wherein one portion of one surface is coated by a mirror surface, and said diffuser is mounted on one portion of other surface.  
   
   
       7 . The light source device according to  claim 1 , wherein said optical focusing system includes at least one optical system using a polyhedral body reflecting or refracting.  
   
   
       8 . The light source device according to  claim 1 , including multiple laser light sources, wherein a light emitted from said multiple laser light source is injected into said diffuser.  
   
   
       9 . The light source device according to  claim 1 , including a diaphragm for determining an acceptable emission limit of said collimator.  
   
   
       10 . The light source device according to  claim 9 , wherein an aperture of said diaphragm is variable.  
   
   
       11 . The light source device according to  claim 1 , wherein an incident surface of said diffuser is a concave surface.  
   
   
       12 . The light source device according to  claim 1 , wherein a set of microlenses or micromirrors is used instead of said diffuser.  
   
   
       13 . The light source device according to  claim 12 , wherein said microlens or micromirror attenuates a fraction of power which does not exceed 10% of a light emitted from said laser light source.