| 摘要 |
A method for printing a letter, character or a figure on an inner ear type headphone, which is a molded body of a thermoplastic synthetic resin, by irradiating the surface with a laser light, and a headphone housing on which the letter etc. has been printed by the above method. The printing is performed by irradiating the surface of the synthetic resin molded body with a laser light for expanding any moisture or air contained in the molded body for foaming the surface. Printing is achieved in the form of foamed regions of the synthetic resin and hence is clear and superior in abrasion resistance and durability.
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