To provide a composite light control plate which uniformly disperses light from a light source.
In the composite light control plate having first and second light control plates having protrusions which are arranged in parallel in a direction orthogonal to an extending direction arranged in this order, the extending directions of the first and second protrusions are parallel with one another, and a cross-sectional shape orthogonal to the extending directions of the respective protrusions of the first and second light control plates are as follows: in the first protrusion, when an axis line in a parallel direction of the protrusion is represented by a uI axis, an axis line orthogonal to the uI axis is represented by a vI axis, a length in a uI axis direction of the protrusion is represented by wIa, a base angle formed by the uI axis and the protrusion is represented by α, a length in a vI axis direction of the protrusion is represented by hIa, and a tip curvature radius of the protrusion is represented by R, the first protrusion satisfies the following formulae (1) to (3); in the second protrusion, when an axis line in a parallel direction of the protrusion is represented by a uII axis, an axis line orthogonal to the uII axis is represented by a vII axis, and a length in a uII axis direction of the protrusion is represented by wIIa, the second protrusion satisfies a predetermined relation in a range of -0.475wIIa≤uII≤0.475wIIa.
Yoshinori Shimizu
Takashi Mikami
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