Patent ID: 7556393

Claim:
A direct type lighting system comprising: a plurality of light sources, a reflector, and a light control member configured to control an outgoing direction when light reflected by the reflector passes therethrough, wherein the plurality of light sources are separated from proximate light sources by a distance D in a first direction, and are disposed between the light control member and the reflector in a second direction normal to the first direction, the light control member includes an incident plane configured to primarily receive light and an exit plane configured to primarily emit light, and a plurality of convex structures are formed on the exit plane or the incident plane of the light control member, the distance between each of the light sources and the light control member is H in the second direction, and the total light transmittance of the light incident on any point on the incident plane at an angle α=Tan− 1 {(D/2)/H}, where the angle x is the incident angle when light emitted from one of the light sources is incident on the incident plane directly above the middle point between the one light source and the proximate light source of the one light source, is more than 50% of total light transmittance of the plurality of light sources and 1.05-3 times as much as the total light transmittance when the light is incident on the respective points on the incident plane from the normal direction, wherein a ratio of an area of regions U provided below a cross-section of each convex structure and above the incident plane of the light control member to the total area provided below said cross-section of each convex structure is between 0.2-0.8 where the regions U are the areas provided below the convex structures and above the incident plane of the light control member corresponding to portions of the convex structures having a slope with an absolute value of 50-70 degrees.