| 摘要 |
PROBLEM TO BE SOLVED: To improve accuracy of the form and uniformity of the density without time-consuming cutting by molding a lens body with an injection compression molding method by using a composite dielectric material including a thermoplastic resin. SOLUTION: A mold 41 comprises an upper mold 41a and a lower mold 41b. The upper mold 41a and the lower mold 41b form a sprue bore 32, a runner groove 44, a side gate 45, and a cavity 46 which are to be a passage of a molding material. It is constructed such that the compression of all the back surface of a lens body by raising a compression core 47 results in the compression molding of the molding material injected into the cavity 46. The molding material for the lens body is a composite dielectric material prepared by compounding ceramic and polyprophylene, and a lens body 1 having a partial spherical-surface shape on the surface side and planar spherical shape on the back surface is formed by means of the mold 41.
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