Wireless surveillance system
First Claim
1. A method for supplying power in a wireless surveillance system that comprises a base station and at least one surveillance device, such as a camera, the base station comprising a radio frequency transceiver for establishing a telecommunications connection to said at least one surveillance device, a power transmitter that comprises a first light source and means for directing the light emitted from the first light source in a desired direction, and a second light source;
- and the surveillance device, such as camera, comprising means for generating surveillance data and a radio frequency transceiver for transmitting the surveillance data wirelessly to said base station, a power receiver that comprises a first photo-detector for receiving emitted light and transforming it into electric current, and a second photo detector;
the method comprising transmitting by means of the second light source in the power transmitter a substantially parallel light arranged around the light emitted by said first light source, the power of the light being substantially lower than the power of the light emitted by said first light source, detecting by means of the second photo-detector of the power receiver the light emitted by said second light source, transmitting a control signal from the surveillance device to the base station by means of said radio frequency transceiver in response to receiving the light emitted by said second light source, and switching on the first light source of the power transmitter in response to receiving from the power receiver the control signal on the reception of the light emitted from the second light source.
1 Assignment
0 Petitions
Accused Products
Abstract
A wireless surveillance system that comprises a base station and surveillance devices, such as cameras. The base station comprises a radio frequency transceiver and a power transmitter including a first and second light source and means for directing the first light source in a desired direction. The power of the second light source is substantially lower than that of the first, and it is transmitted parallel around the light emitted by the first light source. The surveillance device comprises a radio frequency transceiver and a power receiver including a first photo-detector for receiving emitted light and a second photo-detector for detecting the light emitted by the second light source. The surveillance device transmits a control signal to the base station, which first switches on the second light source and, in response to the control signal received from the surveillance device, switches on the first light source.
11 Citations
16 Claims
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1. A method for supplying power in a wireless surveillance system that comprises a base station and at least one surveillance device, such as a camera,
the base station comprising a radio frequency transceiver for establishing a telecommunications connection to said at least one surveillance device, a power transmitter that comprises a first light source and means for directing the light emitted from the first light source in a desired direction, and a second light source; - and
the surveillance device, such as camera, comprising means for generating surveillance data and a radio frequency transceiver for transmitting the surveillance data wirelessly to said base station, a power receiver that comprises a first photo-detector for receiving emitted light and transforming it into electric current, and a second photo detector;
the method comprisingtransmitting by means of the second light source in the power transmitter a substantially parallel light arranged around the light emitted by said first light source, the power of the light being substantially lower than the power of the light emitted by said first light source, detecting by means of the second photo-detector of the power receiver the light emitted by said second light source, transmitting a control signal from the surveillance device to the base station by means of said radio frequency transceiver in response to receiving the light emitted by said second light source, and switching on the first light source of the power transmitter in response to receiving from the power receiver the control signal on the reception of the light emitted from the second light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A wireless surveillance system that that comprises a base station and at least one surveillance device, such as a camera,
the base station comprising a radio frequency transceiver for establishing a telecommunications connection to said at least one surveillance device, a power transmitter that comprises a first light source and means for directing the light emitted by the first light source in a desired direction, a second light source, the light emitted by which is substantially lower in power than the light emitted by the first light source, and which emitted light is arranged to be transmitted substantially parallel around the light emitted by the first light source, the surveillance device, such as camera, comprising means for generating surveillance data and a radio frequency transceiver for transmitting the surveillance data wirelessly to said base station, a power receiver that comprises a first photo-detector for receiving emitted light and transforming it into electric current, and a second photo-detector for detecting the light emitted by the second light source, and, in response to the detection, the surveillance device is arranged to transmit a control signal to the base station by means of the radio frequency transceiver, whereby the base station is arranged to first switch on the second light source of the power transmitter and, in response to receiving said control signal on the reception of the light emitted by the second light source, the base station is arranged to switch on the first light source of the power transmitter.
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15. A wireless base station in a surveillance system, which comprises a radio frequency transceiver for establishing a telecommunications connection to at least one surveillance device, wherein
the base station comprises a power transmitter that comprises a first light source and means for directing the light emitted by the first light source in a desired direction, a second light source, the light emitted by which is substantially lower in power than the light emitted by the first light source, and which emitted light is arranged to be transmitted substantially parallel around the light emitted by the first light source, and the base station is arranged first to switch on the second light source of the power transmitter and, in response to receiving from the surveillance device through the radio frequency transceiver a control signal on the reception of the light emitted by the second light source, the base station is arranged to switch on the first light source of the power transmitter.
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16. A wireless surveillance device, such as camera, in a surveillance system, which comprises means for generating surveillance data and a radio frequency transceiver for transmitting the surveillance data wirelessly to a base station of the surveillance system, wherein
the surveillance device comprises a power receiver that comprises a first photo-detector for receiving the light emitted by a first light source of a power transmitter in the base station and transforming it into electric current, and a second photo detector for detecting the light emitted by a second light source of the power transmitter in the base station, whereby, in response to the detection, the surveillance device is arranged to transmit a control signal to the base station by means of the radio frequency transceiver.
Specification