Optical stylus and passive digitizing tablet data input system
June 28, 2009. 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 ReferencesElectro-optical mouse Electronic mouse Optical cursor control device Code and reading system On-line character recognition using closed-loop detector Cursor control device Imaging array Opto-mechanical cursor positioning device Detector for electro-optical mouse Optical mouse with X and Y line patterns on separate planes InventorsApplicationNo. 373298 filed on 06/28/1989US Classes:345/180, Light pen for CRT display178/18.03, Writing digitizer pad382/315Sensing mechanism in platenExaminersPrimary: Brier, JefferyAssistant: Nguyen, Chau Attorney, Agent or FirmInternational ClassesG09G 001/28G08C 021/00 G06K 009/00 AbstractA stylus and table X-Y data input system for a video display system. The pen includes an optical styling having a suitable pickup mechanism and the tablet is passive in nature and provides direct digitized data readout. Absolute positional information is encoded in binary form in the tablet in such a fashion that the pen position upon the tablet is automatically determinable by illuminating a particular area of the tablet and reading off the digitized X-Y coordinate data stored therein. The pen and supporting hardware/software are rotationally insensitive so that the pen may be held in any desired position comfortable to a user. The system provides greatly improved resolution, sampling rate accuracy and general robustness particularly for such applications as text recognition as well as a wide variety of other graphical input uses.Other References
| |
