US 7,320,823 B2
Light diffusing body and a transmission type screen
Keiichi Kitahara, Kounosu (Japan); Hideki Etori, Saitama (Japan); and Yoshihisa Kimura, Tokyo (Japan)
Assigned to Kimoto Co., Ltd., (Japan)
Filed on Feb. 12, 2007, as Appl. No. 11/704,998.
Claims priority of application No. 2006-036262 (JP), filed on Feb. 14, 2006.
Prior Publication US 2007/0190291 A1, Aug. 16, 2007
Int. Cl. B32B 7/02 (2006.01); B32B 5/14 (2006.01); G02B 5/02 (2006.01); G02B 13/20 (2006.01)
U.S. Cl. 428—212  [428/323; 359/599; 359/615; 349/64; 349/112; 349/122] 18 Claims
OG exemplary drawing
 
1. A light diffusing body comprising a transparent resin and spherical micro-particles having a refractive index which is different from that of the transparent resin,
wherein when the value obtained by dividing the sum of scattering cross-sections of all spherical micro-particles contained in the unit area of the light diffusing body by the sum of geometrical cross-sections of all these spherical micro-particles for each of multiple wavelengths, the minimum value of all of values obtained for each wavelength is 90% or higher of the maximum value.