Fresnel lens sheet and transmission type projection screen

Abstract

A Fresnel lens sheet comprises a Fresnel lens on one surface thereof, wherein respective unit surfaces constructing the Fresnel lens sheet have rough surfaces. Since it has a rough surface, it enables suppressing the occurrence of moire, when making up a screen. The other Fresnel lens sheet comprises a Fresnel lens on one surface thereof, and a fly-eye lens or prisms as a regular concavities and convexities configuration for suppressing regular reflection on the surface thereof on a side opposite to the side having the Fresnel lens formed thereon. Since it has on its rear surface a fly-eye lens or a prism, it enables suppressing the occurrence of ghost image.

What is claimed is:  
     
         1 . A Fresnel lens sheet comprising a Fresnel lens on one surface thereof, wherein respective unit surfaces constructing the Fresnel lens sheet have rough surfaces.  
     
     
         2 . A Fresnel lens sheet according to  claim 1 , wherein the arithmetic average roughness (Ra) of the rough surfaces is 0.2 μm or more.  
     
     
         3 . A Fresnel lens sheet according to  claim 1 , further comprising a regular concavities and convexities configuration for suppressing regular reflection on the surface thereof on a side opposite to the side having the Fresnel lens.  
     
     
         4 . A Fresnel lens sheet according to  claim 3 , wherein the regular concavities and convexities configuration is made up of a lenticular lens, a fly-eye lens, or prism.  
     
     
         5 . A Fresnel lens sheet comprising a Fresnel lens on one surface, thereof, and a fly-eye lens or prisms as a regular concavities and convexities configuration for suppressing regular reflection on the surface thereof on a side opposite to the side having the Fresnel lens formed thereon.  
     
     
         6 . A transmission type projection screen comprising a Fresnel lens sheet and a lenticular lens sheet, wherein the Fresnel lens sheet comprises a Fresnel lens on one surface thereof, respective unit surfaces of the Fresnel lens sheet having rough surfaces, and the lenticular lens sheet is disposed on a side having the Fresnel lens location of the Fresnel lens sheet.  
     
     
         7 . A transmission type projection screen according to  claim 6 , wherein the lenticular lens sheet has a lenticular lens on a side thereof having the location of the Fresnel lens sheet and has a light-shading layer on the surface, corresponding to a non-condensing part of the lenticular lens, located on a side thereof opposite to the side having the location of the Fresnel lens sheet.  
     
     
         8 . A transmission type projection screen according to  claim 6 , wherein the lenticular lens sheet has lenticular lenses on a side having the location of the Fresnel lens sheet; and the respective surfaces of the unit lenticular lenses is provided with a light-absorbing layer made of a transparent colored layer.  
     
     
         9 . A transmission type projection screen comprising a Fresnel lens sheet and a lenticular lens sheet, wherein the Fresnel lens sheet comprises a Fresnel lens on one surface thereof, and a fly-eye lens or prisms as a regular concavities and convexities configuration for suppressing regular reflection on the surface thereof on a side opposite to the side having the Fresnel lens formed thereon, and wherein the lenticular lens sheet is disposed on a side having the Fresnel lens location of the Fresnel lens sheet.  
     
     
         10 . A transmission type projection screen according to  claim 9 , wherein the lenticular lens sheet has a lenticular lens on a side thereof having the location of the Fresnel lens sheet and has a light-shading layer on the surface, corresponding to a non-condensing part of the lenticular lens, located on a side thereof opposite to the side having the location of the Fresnel lens sheet.  
     
     
         11 . A transmission type projection screen according to  claim 9 , wherein the lenticular lens sheet has lenticular lenses on a side having the location of the Fresnel lens sheet; and the respective surfaces of the unit lenticular lenses is provided with a light-absorbing layer made of a transparent colored layer.