Patent ID: 11966117
Assignee: KEIWA INCORPORATED
Field: Optics (Instruments)
Classification: CPC G  F | IPC G

Claim 0:
1. An optical sheet, wherein at least a first surface of the optical sheet has unevenness, the optical sheet comprising:
a base layer; and
a light diffusion layer provided on the base layer and having the first surface,
wherein:
the unevenness is formed by dispersing resin beads in a resin matrix, which constitutes the light diffusion layer,
an arithmetic average roughness Ra of the first surface is 0.6 μm or less, where the arithmetic average roughness Ra is measured in conformity with JIS B 0601: 2001 (with an assessment length set to 290 μm), and
a peak count RPc of the first surface is 16 or more, where the peak count RPc is measured in conformity with JIS B 0601: 2001 (with an assessment length set to 290 μm).