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US 12,768,505 B2Granted
LED filament
AssigneeSignify Holding B.V.
InventorsTies Van Bommel, Robert Jacob Pet
Life of this patent
Estimating the term…
Abstract
The present invention relates to an LED filament (10) for providing LED filament light (12), comprising: an elongated carrier (14); and a plurality of light emitting diodes (16) arranged on the elongated carrier, wherein the LED filament is arranged in a coiled-coil configuration.
Claims16
An LED filament for providing LED filament light, comprising:
- an elongated carrier having a first major surface and an opposite second major surface;
- a plurality of light emitting diodes arranged on the first major surface of the elongated carrier;
- and
- a ductile element arranged on the second major surface of the elongated carrier and along at least a major portion of a length of the elongated carrier, the ductile element being configured to allow the LED filament to be shaped from a basic shape into a first coiled shape corresponding to the primary coil and a second coiled shape corresponding to the secondary coil, the first coiled shape and the second coiled shape being dimensionally stable,
- wherein the LED filament is arranged in a coiled-coil configuration, the coiled-coil configuration comprises a primary coil having a primary diameter D1, which primary coil is coiled into a secondary coil having a secondary diameter D2, and
- wherein the plurality of light emitting diodes comprises blue and/or UV light emitting diodes, the plurality of light emitting diodes are covered by an elongated encapsulant, and the elongated encapsulant comprises luminescent material configured to at least partly convert LED light emitted by the blue and/or UV light emitting diodes into converted light.
3 more elements
A method of manufacturing an LED filament, comprising:
- providing a flexible carrier having a first major surface and an opposite second major surface, a ductile element being arranged on the second major surface of the flexible carrier and along at least a major portion of a length of the flexible carrier, a plurality of light emitting diodes being arranged on the first major surface of the flexible carrier, the plurality of light emitting diodes having blue and/or UV light emitting diodes, the plurality of light emitting diodes being covered by an elongated encapsulant, and the elongated encapsulant having luminescent material configured to at least partly convert LED light emitted by the blue and/or UV light emitting diodes into converted light;
- coiling the provided flexible carrier around a rod to provide an LED filament having a primary coil with a primary diameter D1, the ductile element shaping the LED filament into a first coiled shape corresponding to the primary coil that is dimensionally stable;
- and
- coiling the LED filament having the primary coil into a secondary coil having a secondary diameter D2 to provide an LED filament having a coiled-coil configuration, the ductile element shaping the LED filament into a second coiled shape corresponding to the secondary coil that is dimensionally stable.
1 more element
Dependencies are inferred from the claim text.