| 摘要 |
<p>Disclosed are a light control plate unit, an area light source device, and a transmissive image display device, which are capable of adequately uniformly diffusing light from point light sources. An area light source device (10) comprises a plurality of point light sources (22), provided with a prescribed light distribution value; and a light control plate unit (20) that includes a first and second light control plate (301, 302). In the area light source device (10), a plurality of protrusion parts (331, 332) are positioned in parallel upon the upper faces (321, 322) of the two light control plates, said protrusion parts (331, 332) extending in a single direction. The extension directions of the protrusion parts (331, 332) are approximately orthogonal. With the axis that traverses both ends of each cross-section of the protrusion parts (331, 332) designated the u-axis, and the axis that traverses the center between the ends thereof and is orthogonal to the u-axis designated the v-axis, the contour shape v(u) of the cross-section satisfies the formula 0.95v0(u) = v(u) = 1.05v0(u), wherein v0(u) satisfies formula (1), wherein wa is the length of the protrusions (331, 332) in the u-axis direction, 0.40wa = ha = 1.60wa, and -1.00 = ka = 0.25.</p> |
