Reflecting screen, method of manufacturing the same, and reflection-type projection system

Abstract

A reflecting screen 10 comprises a base portion 11 , light transmitting portions 12 provided on the base portion 11 , and light absorbing portions 14 . Each of the light transmitting portions 12 comprises a unit prism shape 12 which has a generally wedge-like shape with a larger width on the image source side than its width on the rear face side and is arranged along a screen face 10 a . A reflecting layer 13 adapted to reflect the image light, which has been transmitted through the unit prism shapes 12 , is provided on the rear face side of each unit prism shape 12 . Each unit prism shape 12 extends linearly, and each light absorbing portion 14 is arranged between each adjacent pair of the unit prism shapes 12.

1 . A method of manufacturing a reflecting screen adapted to reflect image light projected from an image source and including a screen face; the reflecting screen including light transmitting portions which can transmit light, and light absorbing portions adapted to absorb light, wherein the light transmitting portions and the light absorbing portions are formed to alternately extend along the screen face, and wherein a reflecting layer adapted to reflect the image light, which has been transmitted through the light transmitting portions, is provided at least on a rear face side of each light transmitting portion, and each light transmitting portion comprises a unit prism shaped portion which in a cross section orthogonal to the screen face has a generally wedge-like shape with a larger width on an image source side than its width on the rear face side and is arranged along the screen face; and the method comprising the steps of:
 shaping the unit prism shaped portions with a resin;   forming the reflecting layer at portions each corresponding to each apex portion of the generally wedge-like shapes of the formed unit prism shaped portions; and   forming the light absorbing portions after forming the reflecting layer.   
     
     
         2 . The method according to  claim 1 , wherein
 the reflecting layer is formed only on an apex portion of each wedge-like shape of the unit prism shaped portions.   
     
     
         3 . The method according to  claim 1 , wherein
 each of the unit prism shaped portions has a first prism face and a second prism face, which are unsymmetrical to each other.   
     
     
         4 . The method according to  claim 3 , wherein
 the first prism face is formed of a single face; and   the second prism face is formed of two types of faces.   
     
     
         5 . The method according to  claim 4 , wherein
 the first prism face is formed of a single plane;   the second prism face is formed of two types of planes comprising a first plane formed near to the rear face, and a second plane formed nearer to the image source than the first plane;   the first plane of the second prism face is formed of a plane symmetrical to the first prism face; and   the angle defined by the second plane of the second prism face and the normal line to the screen face is larger than the angle defined by the first plane of the second prism face and the normal line to the screen face.   
     
     
         6 . The method according to  claim 1 , further including:
 a combined body comprising:
 a plurality of additional unit prism shaped portions extending along the direction orthogonal to the direction along which the unit prism shaped portions extend; and 
 additional light absorbing portions each arranged between each adjacent pair of the additional unit prism shaped portions is laminated on the combined body comprising the plurality of unit prism shaped portions and the light absorbing portions each arranged between each adjacent pair of the unit prism shaped portions. 
   
     
     
         7 . The method according to  claim 1 , wherein
 the step of forming the light absorbing portions comprises:
 filling a material for forming the light absorbing portions between each adjacent pair of the unit prism shaped portions by wiping. 
   
     
     
         8 . A method of manufacturing a reflecting screen adapted to reflect image light projected from an image source and including a screen face; the reflecting screen including light transmitting portions which can transmit light, and light absorbing portions adapted to absorb light, wherein the light transmitting portions and the light absorbing portions are formed to alternately extend along the screen face, and wherein a reflecting layer adapted to reflect the image light, which has been transmitted through the light transmitting portions, is provided at least on a rear face side of each light transmitting portion, and each light transmitting portion comprises a unit prism shaped portion which in a cross section orthogonal to the screen face has a generally wedge-like shape with a larger width on an image source side than its width on the rear face side and is arranged along the screen face; and the method comprising the steps of:
 shaping the unit prism shaped portions with a resin;   forming the light absorbing portions between each adjacent pair of the formed unit prism shaped portions; and   forming the reflecting layer after forming the light absorbing portions.