Patent ID: 7209630

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 injection mold is comprised of a first mold and a second mold having a first groove and a second groove for each through hole, respectively, which first and second grooves are adapted to mate and form the through hole when the first and second molds are joined together for injection molding with the optical fiber clamped at a portion of the through hole between the first and second grooves, and at least one of opposed portions in the first and second grooves corresponding to the portion of at least one of the through holes at which the optical fiber is clamped is made of an elastic material.