Luminous body for a watch

Details Luminous body for a watch Luminous body for a watch

1999-09-20

2001-03-27

Roskoski, Bernard (Department: 2859)

Horology: time measuring systems or devices

Displays or display device details

Dial or hand

C368S239000, C368S228000

Reexamination Certificate

active

06208593

ABSTRACT:

BACKGROUND OF THE INVENTION
The present invention relates to watches, and more specifically to a luminous body for a watch.
Various watches with luminous means have been disclosed, and have appeared on the market. These watches commonly comprise an electroluminescent layer covered over the bottom surface of a transparent dial. When electrically connected, the electroluminescent layer is energized to produce light and, to illuminate the markers at the dial. Because the electroluminescent layer covers the whole area of the bottom surface of the dial, much electric energy is consumed during its operation.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, the luminous body comprises an insulative layer sandwiched in between a first conductive layer and a second conductive layer, a light penetrable layer covered on the first conductive layers, electroluminescent means arranged on the insulative layer and energized to produce light upon electric connection of the first and second conductive layers to power source, and marks of Arabic numerals, Roman numerals, or the like marked on the electroluminescent means, wherein the electroluminescent means covers only a part of the insulative layer so that less electric energy is consumed during operation of the luminous body. According to another aspect of the present invention, the light penetrable layer has raised portions refracting light from the electroluminescent means. According to still another aspect of the present invention, the electroluminescent means is comprised of a first electroluminescent layer formed of a plurality of electroluminescent indices colored with different colors, and a second electroluminescent layer colored with a particular color. According to still another aspect of the present invention, switch means is provided for controlling power supply to the first and second conductive layers.


REFERENCES:
patent: 5346718 (1994-09-01), Thorgersen et al.
patent: 5513153 (1996-04-01), Thorgersen et al.
patent: 5838644 (1998-11-01), Yoneda et al.

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