Light reflector, planar light source and illumination device using the same

A light reflector comprising:

• a resin film,
• wherein the resin film comprises a bright line preventing layer (B),
• the bright line preventing layer (B) contains a filler in a concentration of at most 20% by weight,
• the light reflector has a reflection angle peak ratio P of from 1.3 to 10, in which the reflection angle peak ratio P is obtained from a reflection peak value P1 and a reflection peak value P2, as measured on a surface of the bright line preventing layer (B), according to the formula (1):
• Reflection Angle Peak Ratio P=P2/P1 (1)
• wherein P1 represents a reflection peak value of the light reflector when a light ray is applied at an angle of 15° to a perpendicular line of the surface of the bright line preventing layer (B) of the light reflector;
• P2 represents a reflection peak value of the light reflector when a light ray is applied at an angle of 45° to the perpendicular line of the surface of the bright line preventing layer (B) of the light reflector,
• the light reflector has a specular reflectance R2 of from 1.4% to 10%, in which the specular reflectance R2 is obtained from a reflectance R1 and a diffuse reflectance R3, as measured on the surface of the bright line preventing layer (B), according to formula (2):
• Specular Reflectance R2=R1−R3 (2)
• wherein R1 represents a reflectance on the surface of the bright line preventing layer (B) of the light reflector;
• R3 represents a diffuse reflectance on the surface of the bright line preventing layer (B) of the light reflector,
• the surface of the bright line preventing layer (B) has projections and recesses, and a density by number of the projections and recesses of the surface of the bright line preventing layer (B) is from 0.1×10−4 to 3.5×10−4/μm2.