Light diffusing laminated plate

• US 6,917,469 B2
• Filed: 06/24/2004
• Issued: 07/12/2005
• Est. Priority Date: 06/27/2003
• Status: Expired due to Fees

• Current Assignee: Japan Acryace Co., Ltd.
• Original Assignee: Japan Acryace Co., Ltd.
• Inventors: Akiyama, Mitsuhiro, Momose, Yoshiaki, Hanne, Takashi, Itou, Kimio
• Primary Examiner(s): MAHONEY, CHRISTOPHER E
• Application Number:
  US10/874,323
• Publication Number:
  US 20040263966A1
• Time in Patent Office: 383 Days
• Field of Search: 359/452, 359/453, 359455-457, 359/615
• US Class Current: 359/453
• CPC Class Codes: G03B 21/625 Lenticular translucent screens

Abstract

A light diffusing laminated plate including a first light diffusing layer containing particles of a transparent light diffusing material dispersed therein and having a concave cross-section, and a second light diffusing layer containing particles of an opaque light diffusing material dispersed therein and having a convex cross-section. The first and second light diffusing layers are laminated together such that the convex and concave surfaces are face to face contact with each other to form a curved interface therebetween. The first and second light diffusing layers have a substantially uniform cross-section in one direction. A transmissive screen for a rear projection display device having a light image source, including the above light diffusing laminated plate and a lens system disposed such that a light image from the source is projected through the light diffusing laminated plate and the lens system and displayed on the screen.

Claims

1. A light diffusing laminated plate, comprising:

a first light diffusing layer of a light transmissive resin containing particles of a transparent light diffusing material dispersed therein, said first light diffusing layer having a substantially uniform cross-section in one direction and a first surface concave in said cross-section; and

a second light diffusing layer of a light transmissive resin containing particles of an opaque light diffusing material dispersed therein, said second light diffusing layer having a substantially uniform cross-section in one direction and a first surface convex in said cross-section and coinciding with said first surface of said first light diffusing layer,

wherein said first and second light diffusing layers are laminated together such that said first surface of said first light diffusing layer is in face to face contact with said first surface of said second light diffusing layer to form a curved interface therebetween.

2. A light diffusing laminated plate as claimed in claim 1, wherein said transparent light diffusing material is at least one substance selected from the group consisting of glass, acrylic resins, styrene resins and silicone resins, and said opaque light diffusing material is at least one substance selected from the group consisting of barium sulfate, calcium carbonate, silica, and aluminum hydroxide.

3. A light diffusing laminated plate as claimed in claim 1, further comprising a third light diffusing layer of a light transmissive resin containing particles of a transparent light diffusing material dispersed therein, said third light diffusing layer having a substantially uniform cross-section in one direction and a first surface concave in cross-section;

wherein said second light diffusing layer has a second surface opposite to said first surface thereof, said second surface of said second light diffusing layer being convex in cross-section and coinciding with said first surface of said third light diffusing layer; and

wherein said third and second light diffusing layers are laminated together such that said first surface of said third light diffusing layer is in face to face contact with said second surface of said second light diffusing layer to form a curved interface therebetween.

4. A light diffusing laminated plate as claimed in claim 3, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said third light diffusing layer has a second surface opposite to said first surface thereof, and wherein at least one of said second surfaces of said first and third light diffusing layers has a lenticular lens.

5. A light diffusing laminated plate as claimed in claim 3, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said third light diffusing layer has a second surface opposite to said first surface thereof, and wherein at least one of said second surfaces of said first and third light diffusing layers has a Fresnel lens.

6. A light diffusing laminated plate as claimed in claim 3, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said third light diffusing layer has a second surface opposite to said first surface thereof, and wherein one of said second surfaces of said first and third light diffusing layers has a Fresnel lens and the other second surface has a lenticular lens.

7. A transmissive screen for a rear projection display device having a light image source, comprising a light diffusing laminated plate according to claim 3 and a lens system disposed such that a light image from said source is projected through said light diffusing laminated plate and said lens system and displayed on said screen.

8. A light diffusing laminated plate as claimed in claim 1, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said second light diffusing layer has a second surface opposite to said first surface thereof, and wherein at least one of said second surfaces of said first and second light diffusing layers has a lenticular lens.

9. A light diffusing laminated plate as claimed in claim 1, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said second light diffusing layer has a second surface opposite to said first surface thereof, and wherein at least one of said second surfaces of said first and second light diffusing layers has a Fresnel lens.

10. A light diffusing laminated plate as claimed in claim 1, wherein said first light diffusing layer has a second surface opposite to said first surface thereof, wherein said second light diffusing layer has a second surface opposite to said first surface thereof, and wherein one of said second surfaces of said first and second light diffusing layers has a Fresnel lens and the other second surface has a lenticular lens.

11. A transmissive screen for a rear projection display device having a light image source, comprising a light diffusing laminated plate according to claim 1 and a lens system disposed such that a light image from said source is projected through said light diffusing laminated plate and said lens system and displayed on said screen.