Magnetic calibration array
First Claim
1. A calibration system for determining calibration data for a host device having an X-Y digitiser, the system comprising:
- an alignment head comprising;
i) an array of magnetic field generators in which the relative position of each magnetic field generator is known; and
ii) a selector operable to select a magnetic field generator of the array;
a calibration controller operable to control the selector to control the selection of said magnetic field generator;
a drive circuit operable to energise the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser; and
a calibration data generator operable;
i) to receive digitiser signal values from said X-Y digitiser in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
ii) to generate calibration data for the X-Y digitiser using the digitiser signal values for the selected magnetic field generator and the known position of the selected magnetic field generator.
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Accused Products
Abstract
A calibration system is provided for use in generating calibration data for calibrating an X-Y digitiser. The calibration system uses an alignment head having an array of magnetic field generators which are for alignment with the X-Y digitiser. Each of the magnetic field generators is individually drivable so that calibration data can be obtained for different positions on the X-Y digitiser corresponding to the positions of the magnetic field generators in the array. The resulting calibration data is then used to generate a correction map which is stored in the X-Y digitiser
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Citations
68 Claims
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1. A calibration system for determining calibration data for a host device having an X-Y digitiser, the system comprising:
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an alignment head comprising;
i) an array of magnetic field generators in which the relative position of each magnetic field generator is known; and
ii) a selector operable to select a magnetic field generator of the array;
a calibration controller operable to control the selector to control the selection of said magnetic field generator;
a drive circuit operable to energise the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser; and
a calibration data generator operable;
i) to receive digitiser signal values from said X-Y digitiser in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
ii) to generate calibration data for the X-Y digitiser using the digitiser signal values for the selected magnetic field generator and the known position of the selected magnetic field generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A method of determining calibration data for a host device having an X-Y digitiser, the method comprising:
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placing an array of magnetic field generators in which the relative position of each magnetic field generator is known, over the host device;
selecting a magnetic field generator of the array;
energising the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser;
receiving digitiser signal values from the X-Y digitiser in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
generating calibration data for the X-Y digitiser using the digitiser signal values for the selected magnetic field generator and the known relative position of the selected magnetic field generator.
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44. A method of manufacturing a host device having an X-Y digitiser, the method comprising:
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mounting the X-Y digitiser in the host device;
positioning an array of magnetic field generators in which the relative position of each magnetic field generator is known adjacent the host device;
selecting a magnetic field generator of the array;
energising the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser;
receiving digitiser signal values from said X-Y digitiser in response to the interaction with the magnetic field generated by the selected magnetic field generator;
generating calibration data for the X-Y digitiser using the digitiser signal values for the selected magnetic field generator and the known relative position of the selected magnetic field generator; and
storing the generated calibration data in the host device for use by said X-Y digitiser.
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45. A method of manufacturing a host device having an X-Y digitiser, the method comprising:
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providing one or more test host devices, each having an X-Y digitiser, determining first calibration data for the or each test host device by;
i) placing an array of magnetic field generators, in which the relative position of each magnetic field generator is known, adjacent to the X-Y digitiser of the test host device;
ii) selecting a magnetic field generator of the array;
iii) energising the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser of the test host device;
iv) receiving digitiser signal values from the X-Y digitiser of the test host device, in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
v) generating first calibration data for the test host device using the digitiser signal values for the selected magnetic field generator and the known position of the selected magnetic field generator;
determining second calibration data representative of the or each first calibration data generated for the or each test host device;
mounting an X-Y digitiser in a non-test host device; and
storing the second calibration data into the non-test host device.
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46. A host device comprising:
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an X-Y digitiser for sensing X-Y positions of a position indicator relative to a work surface of the host device; and
a memory storing calibration data generated by;
placing an array of magnetic field generators, in which the relative position of each magnetic field generator is known, over the host device;
selecting a magnetic field generator of the array;
energising the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser;
receiving digitiser signal values from the X-Y digitiser in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
generating calibration data for the X-Y digitiser using the digitiser signal values for the selected magnetic field generator and the known relative position of the selected magnetic field generator. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68)
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47. A host device comprising:
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an X-Y digitiser for sensing X-Y positions of a position indicator relative to a work surface of the host device; and
a memory storing calibration data generated by;
providing one or more test host devices, each having an X-Y digitiser, determining first calibration data for the or each test host device by;
i) placing an array of magnetic field generators, in which the relative position of each magnetic field generator is known, adjacent to the X-Y digitiser of the test host device;
ii) selecting a magnetic field generator of the array;
iii) energising the selected magnetic field generator to cause the selected magnetic field generator to generate a magnetic field for interaction with the X-Y digitiser of the test host device;
iv) receiving digitiser signal values from the X-Y digitiser of the test host device, in response to the interaction with the magnetic field generated by the selected magnetic field generator; and
v) generating first calibration data for the test host device using the digitiser signal values for the selected magnetic field generator and the known position of the selected magnetic field generator;
determining second calibration data representative of the or each first calibration data generated for the or each test host device; and
wherein said second calibration data is the calibration data stored in said memory.
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Specification