초록 ▼

A planar light source device includes a light source 2, a reflector shade 8, a light guide member 3 having at least one side face 1 positioned adjacent the light source for receiving light from the light source and reflected by the reflector shade, and a light output plate 4 positioned adjacent the

A planar light source device includes a light source 2, a reflector shade 8, a light guide member 3 having at least one side face 1 positioned adjacent the light source for receiving light from the light source and reflected by the reflector shade, and a light output plate 4 positioned adjacent the light guide member 3 with a first surface positioned adjacent a light exit surface of the light guide member 3. The first surface is formed with a multiplicity of projections 7 having respective tips held in tight contact with the light exit surface of the light guide member 3, at least a portion of each of the projections 7 having a curved facet. Of a function descriptive of a sectional shape of each of the projections 7 that is parallel to a direction of travel of light and also a direction normal to the light output plate 4, the maximum value of the absolute value of a linear differential of a portion representative of a facet counter to the light source is chosen to be within the range of 1 to 3.

대표청구항 ▼

1. A planar light source device which comprises:a light source; a reflector shade; a light guide member having at least one side face positioned adjacent the light source for receiving light that is emitted from the light source and reflected by the reflector shade, said light guide member having a

1. A planar light source device which comprises:a light source; a reflector shade; a light guide member having at least one side face positioned adjacent the light source for receiving light that is emitted from the light source and reflected by the reflector shade, said light guide member having a light exit surface; and a light output plate having first and second surfaces opposite to each other and positioned in face-to-face relation with the light guide member with the first surface positioned adjacent the light exit surface of the light guide member, said first surface being formed with a multiplicity of projections having respective tips held in tight contact with the light exit surface of the light guide member, at least a portion of each of the projections having a curved facet; wherein of a function descriptive of a sectional shape of each of the projections that is parallel to a direction of travel of light and also a direction normal to the light output plate, the maximum value of the absolute value of a linear differential of a portion representative of a facet counter to the light source is chosen to be within the range of 1 to 3.