Patent ID: 8517571

Claim:
A lens member comprising: a central axis; a first lens portion including a light incident surface disposed to face a light source, and a light-refracting surface opposite to the light incident surface, the light-refracting surface including a conical surface centered at the central axis and slanted so that a distance between the conical surface and the light incident surface increases as a distance from the central axis increases outward in radial directions perpendicular to the central axis; and a second lens portion including an inner circumferential surface extending around the central axis from an outer circumferential edge of the conical surface of the first lens portion, and an outer circumferential surface centered at the central axis and positioned outward of the inner circumferential surface in the radial directions perpendicular to the central axis, wherein the inner circumferential surface of the second lens portion is a circular cylindrical surface extending substantially parallel to the central axis from the outer circumferential edge of the conical surface of the first lens portion.