| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for applying inexpensive indication to the outer circumferential part of a cylinder member without increasing an outer diameter of the cylinder member, with respect to the identification indication method of the resin-made cylindrical member used in a manufacture process or the like for an antenna used for a mobile radio unit. SOLUTION: A cover 22, that is the resin-made cylindrical member is molded from a resin with which a filler is mixed, whose color tone is changed differently through the emission of an energy ray 27, and a color indication 24 in a ring form is made by emitting the energy ray 27 to the outer circumference of the cylindrical member, while turning the cylindrical member around its center axis. Thus, the identification indication method for the resin-made cylindrical member can be obtained, in which an inexpensive indication is applied to the outer circumference of the cylindrical member, without the need for increasing the outer diameter of the cylindrical member.
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