Method for printing on synthetic resin molded body and headphone

Details Method for printing on synthetic resin molded body and headphone Method for printing on synthetic resin molded body and headphone

1992-04-23

1993-06-29

Ng, Jin F.

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

381187, 381 686, 264 50, H04R 2500

Patent

active

052241718

ABSTRACT:
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.

REFERENCES:
patent: 2930856 (1956-01-01), Toht
patent: 4407768 (1983-10-01), Garcia et al.
patent: 4507346 (1985-03-01), Maurer et al.
patent: 4956838 (1990-10-01), Kamon et al.
patent: 4981194 (1991-01-01), Kamon et al.
patent: 5048092 (1991-09-01), Yamagishi et al.
"Digital Ready In-Ear Stereo Phones", Lightweight Headphones and In-Ear Stereo Phones, Sep. 30, 1989.

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