Shielded RFID transceiver with illuminated sensing surface
A transceiver for reading RFID tags has a ferrite core antenna substantially circular in cross-section having a transmitting and receiving face producing substantially no RF energy below a plane of the transmitting and receiving face outside a peripheral surface of the ferrite core. A portion of the transceiver enclosure which passes through a mounting panel opening functions as light pipe for conducting LED indicator light in a substantially radially symmetrical manner to illuminate a sensing surface of the transceiver.
1. A transceiver for reading RFID tags comprising
an enclosure for mounting through an opening of a panel, the enclosure including a sensing surface for conducting both light and RF energy therethrough,
an antenna for transmitting and receiving RF energy including a ferrite core inductor substantially circular in cross-section having a transmitting and receiving face aligned with and adjacent to the sensing surface,
a multi-color LED means located on an opposite side of the antenna from the sensing surface for indicating at least the functional status of the transceiver,
a light pipe for conveying LED light around the antenna in substantially a radially symmetrical relationship to the sensing surface, and
a light diffusing means for scattering the LED light passing through the sensing surface.
2. The transceiver for reading RFID tags according to claim 1 wherein a portion of the enclosure that passes through the panel to the sensing surface functions as at least part of the light pipe for conducting light produced by the LED means around the antenna to the sensing surface.
3. The transceiver for reading RFID tags according to claim 1 wherein the ferrite core is a half pot core.
4. The transceiver for reading RFID tags according to claim 1 wherein the ferrite core is substantially disk shaped having a center post.
5. A transceiver for reading RFID tags comprising
an enclosure for mounting through an opening of a panel, the enclosure including a sensing surface for conducting both light and RF energy therethrough,
an antenna for transmitting and receiving RF energy including a ferrite core inductor substantially circular in cross-section with a central hole and having a transmitting and receiving face aligned with and adjacent to the sensing surface,
a multi-color LED means for enabling the transmission of LED light through the central hole of the ferrite core inductor to the sensing surface for indicating at least the functional status of the transceiver, and
a light diffusing means for scattering the LED light passing through the sensing surface.
6. The transceiver for reading RFID tags according to claim 5 wherein the LED means is located within the central hole.
7. The transceiver for reading RFID tags according to claim 5 wherein the LED means is located on an opposite side of the antenna from the sensing surface and a light pipe conveys the LED light through the central hole to the sensing surface.
8. The transceiver for reading RFID tags according to claim 5 wherein the light diffusing means includes a radially symmetrical depression on an inside face of the sensing surface axially aligned with the central hole of the ferrite core for preferentially directing light away from the axis of the central hole.
9. A transceiver for reading RFID tags comprising
an enclosure for mounting through an opening of a panel, the enclosure including a sensing surface for conducting both light and RF energy therethrough,
an antenna for transmitting and receiving RF energy including a ferrite core inductor substantially circular in cross-section with a central hole and having a transmitting and receiving face aligned with and adjacent to the sensing surface,
a multi-color LED means located on an opposite side of the antenna from the sensing surface for indicating at least the functional status of the transceiver,
a light pipe for conveying a portion of the LED light through the antenna and a portion of the LED light around the antenna in a substantially radially symmetrical manner to the sensing surface, and
a light diffusing means for scattering the LED light passing through the sensing surface.
10. The transceiver for reading RFID tags according to claim 9 wherein a portion of the enclosure that passes through the panel to the sensing surface functions as at least part of the light pipe for conducting light produced by the LED means around the antenna to the sensing surface.
11. A transceiver for reading RFID tags comprising
an enclosure for mounting through an opening of a panel, the enclosure including a sensing surface for conducting both light and RF energy therethrough,
an antenna for transmitting and receiving RF energy including a ferrite core inductor substantially circular in cross-section having a transmitting and receiving face aligned with and adjacent to the sensing surface, the antenna producing substantially no RF energy below a plane of the transmitting and receiving face outside a peripheral surface of the ferrite core,
a multi-color illumination means encircling the ferrite core below the plane of the transmitting and receiving face of the antenna for indicating at least the functional status of the transceiver, and
a light diffusing means for scattering light produced by the multi-color illumination means passing through the sensing surface.
12. The transceiver for reading RFID tags according to claim 11 wherein the multi-color illumination means includes a plurality of LEDs disposed in a substantially radially symmetrical pattern to provide substantially radially symmetrical illumination of the sensing surface.
13. The transceiver for reading RFID tags according to claim 12 wherein the light diffusing means includes an annular depression on an inside face of the sensing surface concentrically aligned over the plurality of LEDs for preferentially directing light radially inward and radially outward from the annular depression.
14. A method of reading an RFID tag comprising the steps of
mounting a sensing surface of an RFID transceiver through a panel,
providing an RFID transceiver antenna, the antenna including a ferrite core inductor substantially circular in cross-section having a transmitting and receiving face aligned with and adjacent to the sensing surface wherein substantially no RF energy radiates from the antenna below a plane of the transmitting and receiving face outside a peripheral surface of the ferrite core,
modulating RF energy with information for transmission through the sensing surface to an RFID tag,
demodulating RF energy into information received in reply from the RFID tag,
evaluating the received information and the state of the RFID transceiver to determine which of a plurality of colors of light an LED indicator will produce,
conveying indicator light to the sensing surface in a substantially radially symmetrical manner, and
scattering the indicator light passing through the sensing surface.
15. The method of reading an RFID tag according to claim 14 wherein the step of conveying indicator light to the sensing surface further includes the step of conveying indicator light around the antenna to the sensing surface through a portion of an enclosure acting as a light pipe.
16. The method of reading an RFID tag according to claim 14 further including the step of preferentially directing indicator light away from the axis of the central hole as it passes through a radially symmetrical depression on the inside face of the sensing surface axially aligned with the central hole.