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US 6,487,143 B1Granted
Electroluminescent lighting device for a dial
AssigneeEta SA Fabriques d' Ebauches
InventorLaurent Kaelin
Life of this patent
Estimating the term…
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AssigneeEta SA Fabriques d' Ebauches
InventorLaurent Kaelin
Estimating the term…
Peripheral lighting device for the scale of a dial (11) of an apparatus of small dimensions including a case (1) in which are housed a movement (14) driving at least one hand (12a, 12b, 12c) with respect to the scale, a power source (6) and an electronic circuit (15) able to supply a pulsed voltage, said case being closed by crystal (4) extended on the dial side by an annular extension forming a flange (17), characterized in that a circular recess (19) is provided inside the base (18) of the flange (17) to accommodate on the one hand, an electroluminescent ring (20) formed of a strip having a border (21) extending beyond the base and a connecting lug (22), and on the other hand a ring (30) made of translucent plastic material forced into the annular recess (19) to hold the electroluminescent ring (20) at the bottom thereof.
A peripheral lighting device for illuminating the whole surface of a dial of a timepiece including a case in which are housed a movement driving at least one hand with respect to a scale, a power source and an electronic circuit able to supply a pulsed voltage, said case being closed by a crystal extended on the dial side by an annular extension forming a flange, wherein a circular recess having an open bottom and a wall is provided inside the flange to accommodate on the one hand, an electro luminescent ring formed of a strip having a connecting lug, and on the other hand a holding ring made of translucent plastic material forced into the annular recess to hold the electro luminescent ring at the bottom of the recess.
Dependencies are inferred from the claim text.