US 7,320,535 B2
Light control film
Hideki Etori, Saitama (Japan)
Assigned to Kimoto Co., Ltd., Tokyo (Japan)
Appl. No. 10/525,722
PCT Filed Aug. 28, 2003, PCT No. PCT/JP03/10927
§ 371(c)(1), (2), (4) Date Feb. 28, 2005,
PCT Pub. No. WO2004/021052, PCT Pub. Date Mar. 11, 2004.
Claims priority of application No. 2002-254144 (JP), filed on Aug. 30, 2002; application No. 2003-049533 (JP), filed on Feb. 26, 2003; and application No. 2003-286160 (JP), filed on Aug. 04, 2003.
Prior Publication US 2005/0243561 A1, Nov. 03, 2005
Int. Cl. F21V 5/04 (2006.01)
U.S. Cl. 362—335  [362/606; 362/607; 362/618; 362/619] 6 Claims
OG exemplary drawing
 
1. A light control film having a rough surface pattern defining, for each cross-section perpendicular to a base plane of the film, a profile curve along an edge contoured by the rough surface pattern, wherein for substantially all cross-sections perpendicular to a base plane of the film the profile curve has an average of absolute values of slope to said base plane θave and has a ratio Lr=L2/L1 of the length L2 of said profile curve to the length L1 of a straight line defined by intersection of said base plane and the cross-section satisfy the following:
θave÷Lr≧20 and
25≤θave×Lr≤60.