| 摘要 |
A trunk section 11 constituted by a rigid member and a thin film section 12 having infrared permeability can be obtained by integral moulding using the same resin material, and the outer peripheral surface of the trunk section 11 and the outer peripheral surface of the thin film section 12 are formed such that the outer peripheral surfaces are smoothly connected to each other. The connection portion therebetween is free from a step or a seam.
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