METHOD FOR MARKING KEY TOP MADE OF TRANSLUCENT MATERIAL, KEY TOP MARKED BY THAT METHOD, KEY UNIT, AND PROCESS FOR PRODUCING KEY UNIT

Title:

METHOD FOR MARKING KEY TOP MADE OF TRANSLUCENT MATERIAL, KEY TOP MARKED BY THAT METHOD, KEY UNIT, AND PROCESS FOR PRODUCING KEY UNIT

Document Type and Number:

WIPO Patent Application WO/2004/068519

Kind Code:

A1

Abstract:

A method for marking a key top made of a translucent material with a character, a symbol, or the like, with sufficient wear resistance at a timing free from restriction from other processes, and a process for producing an illumination key unit which can be completed in an extremely short time by determining a destination. Inside of a transparent plastic key top is irradiated intermittently with focused laser light having a wavelength belonging to near infrared region of 1064 nm or less, visible region or near ultraviolet region to form an aggregation of multiple fine carbonization black points and an aggregation of points whitened by fine cracks or bubbling representing a character, a symbol, or the like. Under a state where a process capable of being carried out without determining a destination has ended, production is interrupted temporarily or ended and marking is performed by irradiating the top surface of the key top with laser light upon determination of a character, a symbol, or the like, related with the destination.

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Inventors:

KANEKO TAKEHIRO (JP)

Application Number:

PCT/JP2003/016770

Publication Date:

August 12, 2004

Filing Date:

December 25, 2003

Export Citation:

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Assignee:

SUNARROW LTD (JP)
KANEKO TAKEHIRO (JP)

International Classes:

H01H13/705; (IPC1-7): H01H11/00

Foreign References:

JP2002270059A	2002-09-20
JPH10242340A	1998-09-11
JPH05237673A	1993-09-17
JPH05282956A	1993-10-29
JPH1166997A	1999-03-09
JP2000141902A	2000-05-23
JP2000306453A	2000-11-02
JP2000268661A	2000-09-29
JP3074287U	2000-12-26
JPH10101379A	1998-04-21
JPH11111099A	1999-04-23
JP2003321616A	2003-11-14

Other References: