DIGITAL PENS AND A METHOD FOR DIGITAL RECORDING OF INFORMATION
1 Assignment
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Accused Products
Abstract
A digital pen is provided with an optical system with at least one sensor for capturing images of a patterned surface and at least one light source for illuminating the patterned surface when images are captured by the at least one sensor. In order to solve the problem that the sensor is sometimes blinded by specularly reflected light when the digital pen is used on a glossy surface, the optical system is adjustable between at least two image capturing states in which images are captured with a different geometrical arrangement of the at least one sensor and the at least one light source. As a supplement or alternative, the digital pen may illuminate the patterned surface with linearly polarized light having a first polarization direction and further be provided with a linear polarizer in front of the image sensor, which polarizer has a second different polarization direction, preventing specularly reflected light from reaching the sensor.
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Citations
32 Claims
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1-16. -16. (canceled)
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17. A digital pen for digital recording of information using a patterned surface, comprising an optical system with at least one sensor for capturing images of the patterned surface while the digital pen is operated on the patterned surface and at least one light source for illuminating the patterned surface when images are captured by the at least one sensor;
- wherein the optical system is adjustable between at least two image capturing states in which images are captured with a different geometrical arrangement of the at least one sensor and the at least one light source.
- View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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25. A digital pen for digital recording of information using a patterned surface, comprising an optical system with at least one sensor for capturing images of the patterned surface while the digital pen is operated on the patterned surface and at least one light source for illuminating the patterned surface when images are captured by the at least one sensor;
- wherein the digital pen is configured to illuminate the patterned surface with linearly polarized light having a first polarization direction and wherein a linear polarizer having a second different polarization direction is provided in front of the at least one image sensor.
- View Dependent Claims (26, 27)
- 28. A method for digital recording of information using a patterned surface and a digital pen which comprises an optical system with at least one sensor for capturing images of the patterned surface while the digital pen is operated on the patterned surface and at least one light source for illuminating the patterned surface when images are captured by the at least one sensor, the method comprising capturing a first image in a first image capturing state using a first geometrical arrangement of the at least one light sensor and the at least one sensor and capturing a second image in a second image capturing state using a second geometrical arrangement of the at least one light sensor and the at least one sensor.
Specification