Process of producing key units wherein marking on their tops...

Details Process of producing key units wherein marking on their tops... Process of producing key units wherein marking on their tops...

2003-12-25

2009-11-10

Goff, John L (Department: 1791)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

C029S592100, C156S230000, C156S272200, C156S277000, C347S171000, C216S052000

Reexamination Certificate

active

07616224

ABSTRACT:
A method is provided for marking a key top made of a translucent material with a character, a symbol, or the like, and a process is provided for quickly producing an illumination key unit. The 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. After 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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Machine Translation of JP11191333A, Date Unavaliable.

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