Koninklijke Philips Corporation N.v.

Mathias Hubertus Johannes Van Rijswick

Wijnand Evert Jacobus Van Kooten

Erik Paul Boonekamp

Denis Joseph Carel Van Oers

Hendrik Adrianus Van Sprang

Gerhard Hebbinghaus

Andreas Martinus Theodorus Paulus Van Der Putten

The invention relates to a lighting device () comprising an envelope (), a base (), a solid-state light source () and optical means () provided with a light-outcoupling surface, the solid-state light source () being optically coupled to said optical means (). The use of a spirally wound optical fiber as optical means () and a transparent envelope () shaped as a conventional light bulb provides a lighting device () which is a good look -alike of the conventional incandescent lamp, such as, for instance, the carbon filament lamp. The long lifetime and high efficiency of LEDs as a solid-state light source () will make this lighting device () a very attractive alternative for the conventional incandescent lamp. The lighting device () according to the present invention has the further advantage that a large gamut of colors can be chosen and adjusted by using, for instance, red green and blue LEDs in said lighting device (). The electronics for driving and controlling the intensity and color settings can be incorporated in the lighting device ().

Lighting device

The invention relates to a lighting device () comprising an envelope (), a base (), a solid-state light source () and optical means () provided with a light-outcoupling surface, the solid-state light source () being optically coupled to said optical means (). The use of a spirally wound optical fiber as optical means () and a transparant envelope () shaped as a conventional light bulb provides a lighting device () which is a good look-alike of the conventional incandescent lamp, such as, for instance, the carbon filament lamp. The long life-time and high efficiency of LEDs as a solid-state light source () will make this lighting device () a very attractive alternative for the conventional incandescent lamp. The lighting device () according to the present invention has the further advantage that a large gamut of colors can be chosen and adjusted by using, for instance, red green and blue LEDs in said lighting device (). The electronics for driving and controlling the intensity and color settings can be incorporated in the lighting device ().

The invention relates to a lamp-reflector unit () provided with a first () and a second light source () axially disposed on a lamp axis (), and a reflector () with a reflecting part (). A modification of the reflecting part of the reflector to a shape somewhere in between a parabolic shape and a shape of a straight cone achieves that light of a narrow beam, i.e. a beam with a beam angle less than 15&#xb0;, is obtained from the first light source, while the light beam as obtained from the second light source does not show any 'optical hole' in its center.

Halogen dual-beam lamp

The electric lamp comprises a lamp vessel ( ) which transmits visible light and which accommodates a light source ( ). The electric lamp comprises a light-absorbing medium ( ). The lamp vessel ( ) is covered with an optical interference film ( ) which comprises layers composed of a first layer of silica and a second layer of a material having a relatively high refractive index which alternate with each other. According to the invention, light from the light source ( ) travels through the light-absorbing medium ( ) before reaching the interference film ( ). Preferably, the light-absorbing layer ( ) is disposed between the lamp vessel ( ) and the interference film ( ). Alternatively, the light-absorbing layer is contained in a wall of the lamp vessel. Preferably, the interference film ( ) reflects substantially in the same wavelength range as that wherein the light-absorbing medium ( ) absorbs, preferably in the range from 570 to 620 nm. Preferably, the electric lamp emits, in operation, colored light but has a color-neutral appearance when the lamp is in the off-state. The light-absorbing layer ( ) preferably predominantly comprises Nd O , CoAl O , Fe O , ZnFe O , ZnO.Fe O or BiVO .

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Eindhoven, Netherlands

Mathias Hubertus Johannes Van Rijswick