Coordinate input device
First Claim
1. A coordinate input device, comprising:
- a pressure-sensitive sensor for detecting a coordinate position input defined by coordinates regardless of an amount of pressure imparted upon said pressure-sensitive sensor and obtaining a first input value indicative of the coordinate position input as detected by the pressure-sensitive sensor;
an electromagnetic-induction sensor for detecting the position input defined by coordinates and obtaining a second input value indicative of the position input as detected by the electromagnetic-induction sensor, the pressure-sensitive sensor and electromagnetic-induction sensor configured to permit simultaneous detection of the position input and to simultaneously obtain the first and second input values, the electromagnetic-induction sensor having a tendency to be a more accurate indication of the position input than the pressure-sensitive sensor;
a position indicator configured to simultaneously perform the position input on the pressure-sensitive sensor and the electromagnetic-induction sensor;
a determining unit configured to determine whether the position indicator performs the position input on the pressure-sensitive sensor and electromagnetic-induction sensor to simultaneously obtain coordinates of the first input value and the second input value, respectively;
a difference detecting unit to detect a difference value between the coordinates of the first input value and the second input value when the determining unit determines that the position indicator performs the position input on the pressure-sensitive sensor and electromagnetic-induction sensor to simultaneously obtain coordinates of the first input value and the second input value, respectively;
a storing unit configured to store the difference value as correction information; and
a correcting unit configured to correct the first input value using the stored correction information, the corrected first input value used as the coordinate position input when the second input value is not obtained,wherein said storing unit updates the correction information in real time to account for degradation in performance of the pressure-sensitive sensor that occurs with repeated use of the pressure-sensitive sensor.
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Accused Products
Abstract
A coordinate input device is provided. The coordinate input device includes a first input device for detecting a position input and obtaining a first input value indicate of the position, a second input device for detecting the position input and obtaining a second input value indicative of the position, the second input value having a tendency to be a more accurate indication of the position than the first input value, a determining unit configured to determine whether the first input device and the second input device simultaneously obtain the first input value and the second input value, respectively, a storing unit configured to store a relationship between the first input value from the first input device and the second input value from the second input device as correction information, and a correcting unit configured to correct the first input value on the basis of the correction information.
9 Citations
25 Claims
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1. A coordinate input device, comprising:
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a pressure-sensitive sensor for detecting a coordinate position input defined by coordinates regardless of an amount of pressure imparted upon said pressure-sensitive sensor and obtaining a first input value indicative of the coordinate position input as detected by the pressure-sensitive sensor; an electromagnetic-induction sensor for detecting the position input defined by coordinates and obtaining a second input value indicative of the position input as detected by the electromagnetic-induction sensor, the pressure-sensitive sensor and electromagnetic-induction sensor configured to permit simultaneous detection of the position input and to simultaneously obtain the first and second input values, the electromagnetic-induction sensor having a tendency to be a more accurate indication of the position input than the pressure-sensitive sensor; a position indicator configured to simultaneously perform the position input on the pressure-sensitive sensor and the electromagnetic-induction sensor; a determining unit configured to determine whether the position indicator performs the position input on the pressure-sensitive sensor and electromagnetic-induction sensor to simultaneously obtain coordinates of the first input value and the second input value, respectively; a difference detecting unit to detect a difference value between the coordinates of the first input value and the second input value when the determining unit determines that the position indicator performs the position input on the pressure-sensitive sensor and electromagnetic-induction sensor to simultaneously obtain coordinates of the first input value and the second input value, respectively; a storing unit configured to store the difference value as correction information; and a correcting unit configured to correct the first input value using the stored correction information, the corrected first input value used as the coordinate position input when the second input value is not obtained, wherein said storing unit updates the correction information in real time to account for degradation in performance of the pressure-sensitive sensor that occurs with repeated use of the pressure-sensitive sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A digitizer tablet comprising:
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a pointing device; a first input device including a pressure-sensitive sensor for sensing a first type of position input used to calculate a first input coordinate value regardless of a pressure imparted upon said pressure-sensitive sensor; a second input device including a electromagnetic-induction sensor in electromagnetic communication with the pointing device to interact with the pointing device for sensing a second type of position input used to calculate a second input coordinate value simultaneously with said first input device sensing said first type of position input, the first type of position input being different than the second type of position input; a difference detecting unit configured to detect a difference value between the first input coordinate value and the second input coordinate value when the first and second types of position input are sensed simultaneously; a storing unit configured to store the difference value as correction information; and a correction processing unit for correcting the first input coordinate value based on the stored correction information, the corrected first input coordinate value used as the coordinate position input when the second input coordinate value is not obtained, wherein said correction processing unit corrects the first input coordinate value to compensate for inaccuracies in the first input coordinate value due to wear on said pressure-sensitive sensor. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A method of detecting a coordinate input on a digitizer tablet having first and second input devices of differing degrees of accuracy, the method comprising the steps of:
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detecting a position input defined by coordinates using the first input device including a pressure-sensitive sensor for obtaining a first input value indicative of the position input regardless of a pressure imparted to said pressure-sensitive sensor; detecting the position input defined by coordinates using the second input device including an electromagnetic-induction sensor simultaneously with said step of detecting said position input using the first input device and obtaining a second input value, the second input value having a tendency to be a more accurate indication of the position than the first input value; determining whether the first input device and the second input device simultaneously obtain the first input value and the second input value, respectively; detecting a difference value between the coordinates of the first input value and second input value when it is determined that first input device and the second input device simultaneously obtain the first input value and the second input value, respectively; storing the difference value as correction information; correcting the first input value using the correction information, the corrected first input value used as the coordinate position input when the second input value is not obtained, and updating the correction information in real time to account for degradation in performance of the pressure-sensitive sensor that occurs with repeated use of the pressure-sensitive sensor. - View Dependent Claims (22, 23, 24, 25)
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Specification