Lighting device with a wireless communication antenna
There is provided a lighting device comprising an exhaust tube and a wireless communication antenna arranged inside the exhaust tube. There is also provided a method for producing such a lighting device.
1. A lighting device comprising:
a light source carrier having one or more solid state light sources, the light source carrier being a heat sink for the one or more solid state light sources;
a light transmissive envelope to contain the light source carrier;
a connector for mechanically and electrically connecting the lighting device to a lamp socket;
an exhaust tube being arranged inside the light transmissive envelope for introducing a gas into the light transmissive envelope during production and then being sealed to keep the light transmissive envelope airtight, wherein at least a portion of the exhaust tube is surrounded by the light source carrier such that the exhaust tube is partly arranged in an interior space of the light source carrier;
a wireless communication antenna arranged inside the exhaust tube, wherein the antenna is galvanically isolated from the light source carrier, further wherein an outer portion of the wireless communication antenna protrudes from an open top end of the exhaust tube;
a support structure attached to the exhaust tube, wherein the support structure is configured to support the outer portion of the wireless communication antenna at a first distance from the exhaust tube and a second distance from the light source carrier; and
a control circuit electrically connected to the wireless communication antenna and configured to control the one or more solid state light sources.
2. The lighting device according to claim 1 , wherein:
the light source carrier includes a tubular light source carrier attached to the exhaust tube, the exhaust tube being arranged partly inside the tubular light source carrier.
3. The lighting device according to claim 2 , wherein an open end of the exhaust tube is situated inside the tubular light source carrier.
4. The lighting device according to claim 2 , wherein the tubular light source carrier is adapted to act as a radiator, an electrical resonance frequency of the tubular light source carrier being approximately equal to a receiving frequency of the antenna.
5. The lighting device according to claim 2 , further comprising: a driver configured to power the one or more solid state light sources.
6. The lighting device according to claim 5 , wherein the control circuit is positioned completely inside the envelope.
7. The lighting device according to claim 5 , further comprising at least one of a light scattering layer and a wavelength converting layer.
8. The lighting device according to claim 5 , wherein the lighting device is a gas filled light bulb.
9. The lighting device according to claim 1 , wherein the outer portion of the antenna has a loop-like shape.
10. The lighting device according to claim 1 , wherein the light source carrier is attached to the exhaust tube via a carrier support, wherein the carrier support extends upwards from the connector.
11. A method for producing a lighting device, comprising
arranging an antenna inside an exhaust tube of the lighting device;
forming an airtight connection between the exhaust tube and a stem element;
sealing the stem element together with the exhaust tube and the antenna in a light-transmissive envelope;
connecting a connector containing a control circuit with the envelope and the stem element via contact wires such that the control circuit is electrically connected to the antenna; and
mounting a light source carrier with solid state light sources on the exhaust tube, wherein the antenna arranged in the exhaust tube is galvanically isolated from the light source carrier, wherein an outer portion of the antenna protrudes from an open top end of the exhaust tube, wherein a support structure is configured to support the outer portion of the antenna at a first distance from the exhaust tube and a second distance from the light source carrier, and wherein the light source carrier surrounds at least a portion of the exhaust tube such that the exhaust tube is partly arranged in an interior space of the light source carrier.
12. The method according to claim 11 , further comprising
filling an inert gas in the light-transmissive envelope through the exhaust tube such that the gas-filled light-transmissive envelope protects one or more solid state light sources of the lighting device inside the light-transmissive envelope.