Patent ID: 7628502

Claim:
A light controlling sheet having a sheet surface provided in a straight-down type surface light source device including a light source portion, the light controlling sheet comprising: an outgoing light side lens portion having multiple unit lenses arranged to project toward an outgoing light side; transparent portions provided on an incident light side; an incident light side lens portion having a lens shape which projects toward the incident light side formed in each transparent portion; and reflecting portions comprising areas other than the transparent portions on the incident light side; wherein the transparent portions transmit light coming from the light source portion, the reflecting portions reflect light coming from the light source portion, the transparent portions and the reflecting portions are arranged alternately, and the transparent portions comprise 40% to 60% of a total area of the light controlling sheet when viewed from a direction orthogonal to the sheet surface on the incident light side so that the light controlling sheet uniformalizes and/or condenses light coming from the light source portion.