Key top and key top lighting device in an electronic apparatus

Details Key top and key top lighting device in an electronic apparatus Key top and key top lighting device in an electronic apparatus

2005-07-12

2005-07-12

Lee, K. Richard (Department: 2832)

Electricity: circuit makers and breakers

Electric switch details

Indicators

C200S310000, C400S479000, C345S168000

Reexamination Certificate

active

06917005

ABSTRACT:
A key top, a key top lighting device and an electronic apparatus with improved operability for use in the dark is provided wherein the key top can be illuminated at a low power consumption rate and without disturbing the people nearby. Specifically, a transparent fluorescent ink that emits fluorescent light upon being irradiated by black light having a wavelength within a range of 300 nm to 450 nm is printed on the key top, and a black light lamp irradiates the black light on this key top, so that the operability of the key top can be improved when used in the dark.

REFERENCES:
patent: 4250242 (1981-02-01), Doering
patent: 5507661 (1996-04-01), Honda et al.
patent: 6036326 (2000-03-01), Yoshikawa et al.
patent: 6196738 (2001-03-01), Shimizu et al.
patent: 722425 (1995-04-01), None
patent: 1092258 (1998-04-01), None
Patent Abstracts of Japan 10092258 A, Apr. 1998.

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