Optical position detecting unit, optical coordinate input unit and optical position detecting method employing a pattern having a sequence of 1's and 0's
July 28, 2014. 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 ReferencesDirection-sensing virtual aperture radiation detector Optical sensors System for monitoring the movements of one or more point sources of luminous radiation Cordless digital graphics input device Electro-optical position determining system System for locating a body in motion Touch screen input system Opto-electronic device for detecting and locating a radiant source Brightpen/pad II Optical coordinate input apparatus and position indicator thereof InventorsAssigneeApplicationNo. 281129 filed on 07/28/1994US Classes:356/620, Special mark or target on object250/222.1, Inanimate article345/175, Including optical detection345/179StylusExaminersPrimary: Gonzalez, FrankAssistant: Eisenberg, Jason D. Attorney, Agent or FirmForeign Patent References
International ClassesG01B 011/14H01J 040/14 G03B 019/10 Foreign Application Priority Data1993-03-23 JPAbstractAn optical position detecting unit is configured by an image pickup unit for detecting the intensity of light, a pattern member disposed in the front of the image pickup unit and on a light path of the light and having a specific pattern, and a signal processing unit for extracting information with respect to the distance in the direction of a normal line of a pixel array region of the image pickup unit between a light-emitting source and the image pickup unit on the basis of signals with respect to the specific pattern projected to the pixel array. A distance between the pattern member and the pixel array of the image pickup unit is required to be known in advance in order to extract the information with respect to the distance. By using only one image pickup unit, the distance to the light-emitting source can be calculated.Other References
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