Patent ID: 7142762

Claim:
An injection mold for a light guide body, comprising: a cavity defined inside the injection mold to provide a contour of the light guide body; and a plurality of through holes each of which communicates with the cavity and allows an optical fiber to be inserted in the through hole, wherein each through hole includes a columnar space provided in at least a portion contiguous to the cavity, the columnar space having a predetermined length and a cross section similar to that of the optical fiber and a clearance left between the columnar space and the optical fiber when the optical fiber is inserted in the through hole is 30 μm or less, wherein the cavity is comprised of a main body portion, and a plurality of tapered portions corresponding to the through holes, each of the tapered portions having a thinner end contiguous to the through hole and a thicker end contiguous to the main body, wherein a taper angle of at least one of the tapered portions is substantially equal to an angle of divergence of light traveling through a portion of the light guide body corresponding to the main body portion of the cavity.