Pen-shaped handwriting input apparatus using accelerometers and gyroscopes and an associated operational device for determining pen movement
Patent 5981884 Issued on November 9, 1999. Estimated Expiration Date: 
December 23, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 23, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAutonomous computer input device and marking instrument Multidimensional signal input device Gyroscopic pointer Input apparatus Cordless position detection apparatus Spatial motion pattern input system and input method Patent #: 5598187 Inventors
AssigneeApplicationNo. 219765 filed on 12/23/1998US Classes:178/19.01, Writing digitizer stylus178/19.03, Capacitive or inductive stylus178/19.05Light penExaminersPrimary: Shankar, VijayAttorney, Agent or FirmForeign Patent References
International ClassG08C 021/00Foreign Application Priority Data1996-02-20 JPAbstractA small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.Field of SearchWriting digitizer stylusCapacitive or inductive stylus Pressure stylus Light pen DISPLAY PERIPHERAL INTERFACE INPUT DEVICE Including orientation sensors (e.g., infrared, ultrasonic, remotely controlled) Portable (i.e., handheld, calculator, remote controller) Stylus Using a signature Sensing pressure together with speed or acceleration PATTERN RECOGNITION On-line recognition of handwritten characters With a display | |
