Projection board

Abstract

A projection board provides an acrylic transparent base material with a flat facial side thereof uniformly adhered with a metal grain layer made of aluminum powder to show an image projected from a projector brightly by means of refection of the metal grain layer. Further, another flat facial side of the transparent base material is uniformly adhered with a frosted layer, which has light penetration rate between 40 to 95% and thickness between 1 to 4 micrometers for obtaining much better effect of image display.

1 . A projection board, which is suitable of showing an image projected by a projector, comprising:
 a transparent base material being a flat plate with a first flat facial side and a second flat facial side opposite to each other; and   a metal grain layer being uniformly adhered onto the first flat facial side to reflect and show the image.   
   
   
       2 . The projection board as defined in  claim 1 , wherein the transparent base is made of such as glass, plastics, thin film or acrylic. 
   
   
       3 . The projection board as defined in  claim 1 , wherein the metal grain layer is made of silver powder or aluminum powder. 
   
   
       4 . The projection board as defined in  claim 1 , wherein the metal grain layer is adhered to the first flat facial side with adhesive. 
   
   
       5 . The projection board as defined in  claim 1 , wherein the metal grain layer is attached to a first plastic film and the first plastic film is adhered to the first flat facial side. 
   
   
       6 . The projection board as defined in  claim 1 , further comprises a frosted layer, which is uniformly adhered to the second flat facial side and provides a specific light penetration rate. 
   
   
       7 . The projection board as defined in  claim 6 , wherein the light penetration rate is between 40 to 95%. 
   
   
       8 . The projection board as defined in  claim 6 , wherein the thickness of frosted layer is between 1 to 4 micrometers. 
   
   
       9 . The projection board as defined in  claim 6 , wherein frosted layer is a thin layer made of glass powder, mica powder, quartz powder or wax. 
   
   
       10 . The projection board as defined in  claim 6 , further comprises a yarn net adhered onto the frosted layer. 
   
   
       11 . The projection board as defined in  claim 10 , wherein the yarn net is made of nylon or polyester fiber. 
   
   
       12 . The projection board as defined in  claim 6 , further comprises:
 a yarn net adhered onto the metal grain layer; and   a second plastic film adhered onto the yarn net.   
   
   
       13 . The projection board as defined in  claim 12 , wherein the yarn net is made of nylon or polyester fiber. 
   
   
       14 . The projection board as defined in  claim 6  further comprises:
 a second plastic film adhered onto the metal grain layer; and   a yarn net adhered onto the second plastic film.   
   
   
       15 . The projection board as defined in  claim 14 , wherein the yarn net is made of nylon or polyester. 
   
   
       16 . The projection board as defined in  claim 1 , wherein the metal grain layer provides 100% light shielding rate. 
   
   
       17 . The projection board as defined in  claim 1 , wherein the metal grain layer contains anti-friction powder and provides hardness over 1 H.