Backlit keypad assembly

Details Backlit keypad assembly Backlit keypad assembly

1996-09-30

1998-01-27

Sember, Thomas M.

Illumination

Illuminated scale or dial

Internal light source

362 24, 362 27, 200313, 200314, H04M 122

Patent

active

057115885

ABSTRACT:
Light-reflecting structures are provided on the lower surface of a cover mounted over the keys of a keypad assembly. The light-reflecting structures reflect light from a vertical-emitting source, such as an LED, to the side surfaces of the individual keys of the keypad assembly. The keypad assembly embodying the present invention provides an efficient and low-cost structure for illuminating the keys of a keypad without the use of lightguides or separate sources of light for each key, thereby also providing a desirable low profile keypad assembly.

REFERENCES:
patent: 4670633 (1987-06-01), Kaiwa et al.
patent: 5053928 (1991-10-01), Pasco
patent: 5083240 (1992-01-01), Pasco
patent: 5097396 (1992-03-01), Myers
patent: 5130897 (1992-07-01), Kuzma
patent: 5149923 (1992-09-01), Demeo
patent: 5384459 (1995-01-01), Patino et al.
patent: 5397867 (1995-03-01), Demeo
patent: 5510782 (1996-04-01), Norris et al.

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