Glass reflector for projector and manufacturing method for the same

Abstract

For example, the reflector according to the present invention is a reflector made of glass for a projector which is composed of amorphous glass whose thermal expansion coefficient is 30 to 45×10 −7 /° C. and includes a reflective surface for reflecting light emitted from a light source and an opening for inserting a light source bulb or a conductor to the light source bulb, in which the opening is smoothed by heat-treating the surface thereof after opening-drilling, thus mechanical damage is removed from the processed part.

1 - 9 . (canceled)  
   
   
       10 . A manufacturing method for a reflector made of glass for a projector having a reflective surface for reflecting light emitted from a light source and an opening for inserting a light source bulb or a conductor to said light source bulb, comprising: 
 the press-molding step of press-molding molten glass in a predetermined reflector shape by a mold having a bottom mold and a plunger,    the opening forming step of forming said opening by removing glass at the part touching said opening of said reflector formed at said press-molding step, and    the surface smoothing step of heat-treating said opening formed at said opening forming step to smooth the surface thereof, thereby removing mechanical damage from the processed part.    
   
   
       11 . A manufacturing method for a reflector made of glass for a projector according to  claim 10 , wherein said opening forming step heats said part touching said opening and then forms said opening by punching from the side of said reflective surface.  
   
   
       12 . A manufacturing method for a reflector made of glass for a projector according to  claim 10 , wherein said opening forming step forms said opening by a drill from the side of said reflective surface.  
   
   
       13 . A manufacturing method for a reflector made of glass for a projector according to  claim 10 , wherein said opening forming step forms said opening by cutting said part touching said opening.  
   
   
       14 . A manufacturing method for a reflector made of glass for a projector according to  claim 10 , wherein said surface smoothing step smoothes said surface by applying a flame to said opening so that the mean roughness of said surface becomes 0.03 μm or less.  
   
   
       15 . A manufacturing method for a reflector made of glass for a projector according to  claim 10 , wherein said surface smoothing step smoothes said surface by radiating a laser beam to said opening.