Digitizer tablet with pressure stylus
First Claim
1. In a digitizer tablet comprising an electrode array, a pointing device whose position is to be located with respect to the array and whose applied pressure is to be determined with respect to the tablet, and means for energizing the array and tablet to generate position and pressure signals representative, respectively, of the pointing device position and pressure, said pointing device having a linear transducer for converting applied pointing device pressure into electrical signals linearly related to the applied pressure, the improvement comprising:
- (a) means for processing the transducer electrical signals to convert their linear relation to pointing device pressure to a substantially logarithmic relation.
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Accused Products
Abstract
A digitizer tablet using a pressure-sensitive pointing device preferably containing a linear transducer is provided with the means to convert linear pressure signals to logarithmically-related output counts. The conversion means is programmable to allow outputting of a logarithmically or a linearly related count for use by an application program.
38 Citations
22 Claims
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1. In a digitizer tablet comprising an electrode array, a pointing device whose position is to be located with respect to the array and whose applied pressure is to be determined with respect to the tablet, and means for energizing the array and tablet to generate position and pressure signals representative, respectively, of the pointing device position and pressure, said pointing device having a linear transducer for converting applied pointing device pressure into electrical signals linearly related to the applied pressure, the improvement comprising:
(a) means for processing the transducer electrical signals to convert their linear relation to pointing device pressure to a substantially logarithmic relation. - View Dependent Claims (2)
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3. In a digitizer tablet comprising an electrode array, a pointing device whose position is to be located with respect to the array and whose applied pressure is to be determined with respect to the tablet, and means for energizing the array and tablet to generate position and pressure signals representative, respectively, of the pointing device position and pressure, said pointing device having a linear transducer for converting applied pointing device pressure into electrical signals linearly related to the applied pressure, the improvement comprising:
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(a) means for digitizing the transducer electrical signals, (b) means for processing the digitized transducer signal value to convert their linear relation to applied pointing device pressure to a logarithmic relation, (c) means for storing the logarithmically converted digitized transducer signals. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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10. In a digitizer tablet comprising an electrode array, a pointing device whose position is to be located with respect to the array and whose applied pressure is to be determined with respect to the tablet, and means for energizing the array and tablet to generate position and pressure signals representative, respectively, of the pointing device position and pressure, said pointing device having a linear transducer for converting applied pointing device pressure into electrical signals linearly related to the applied pressure, the improvement comprising:
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(a) means for digitizing the transducer electrical signals, (b) means for processing the digitized transducer signal values, to convert their linear relation to a substantially logarithmic relation, (c) means for enabling and disabling the logarithmic conversion processing means to output a logarithmically related value when enabled and a linearly related value when disabled. - View Dependent Claims (11)
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12. A method for operating a digitizer tablet having a pointing device containing a transducer for converting pointing device pressure into an electrical signal, comprising the steps:
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(a) converting the transducer signal into a count logarithmically related to the pointing device pressure, (b) storing the logarithmically related count.
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13. A method for operating a digitizer tablet having a pointing device containing a linear transducer for converting pointing device pressure into an output signal linearly related to the applied pointing device pressure, comprising the steps:
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(a) providing means for converting the transducer output signal to a count linearly related to the pressure, (b) providing processing means for converting the linearly related count to a logarithmically-related count, said means being capable of being enabled and disabled, (c) enabling the processing means of step(b) to obtain a logarithmically related count, (d) disabling the processing means of step(b) to obtain a linearly related count. - View Dependent Claims (14)
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15. A method for operating a digitizer tablet having a pointing device containing a linear transducer for converting pointing device pressure into an output signal linearly related to the applied pointing device pressure, comprising the steps:
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(a) converting the linearly related output signal to a logarithmically-related count, (b) storing the count obtained in step(a). - View Dependent Claims (16, 17, 18, 19, 20)
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21. In a digitizer tablet comprising an electrode array, a pointing device whose position is to be located with respect to the array and whose applied pressure is to be determined with respect to the tablet, and means for energizing the array and tablet to generate position and pressure signals representative, respectively, of the pointing device position and pressure, the improvement comprising:
(a) means in the tablet for receiving and converting the pressure signals generated by the pointing device into output data values which are substantially logarithmically related to the applied pointing device pressure. - View Dependent Claims (22)
Specification