KEY UNIT, METHOD FOR MARKING KEY TOP, AND METHOD FOR MANUFACTURING KEY UNIT USING THE SAME

As a marking laser beam, a laser beam of wavelength 532nm obtained by extracting by extracting second higher harmonic of the Nd:YAG laser or a laser beam of wavelength 355 nm obtained by extracting third higher harmonic of the Nd:YAG laser is used on a metal film formed on a plastic key top of a mob...

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Bibliographic Details
Main Author KANEKO, TAKEHIRO
Format Patent
LanguageEnglish
French
German
Published 20.07.2005
Edition7
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC SWITCHES
ELECTRICITY
EMERGENCY PROTECTIVE DEVICES
RELAYS
SELECTORS
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Summary:As a marking laser beam, a laser beam of wavelength 532nm obtained by extracting by extracting second higher harmonic of the Nd:YAG laser or a laser beam of wavelength 355 nm obtained by extracting third higher harmonic of the Nd:YAG laser is used on a metal film formed on a plastic key top of a mobile telephone or the like, so that the metal film portion subjected to the beam is completely removed or only the surface portion of the metal film subjected to the beam is removed, thereby forming a planar set of very small concave points. Thus, it is possible to obtain a key unit having a metal film on which a character or symbol is directly marked.
Bibliography:Application Number: EP20030756733