X-Y Position input device for display system
Patent 4559532 Issued on December 17, 1985. Estimated Expiration Date: 
August 8, 2003. 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.
August 8, 2003. 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.InventorApplicationNo. 06/521324 filed on 08/08/1983US Classes:345/164, Rotatable ball detector345/162, Positional storage means74/471XYControl moves in two planesExaminersPrimary: Curtis, Marshall M.Attorney, Agent or FirmInternational ClassG06F 3/033 (20060101)Foreign Application Priority Data1982-08-07 JPAbstractAn X-Y input device comprises a rotatable ball, a first driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, a second driven roller held in contact with the rotatable ball and rotatable in response to rotation of the rotatable ball, the second driven roller having an axis of rotation extending perpendicularly to that of the first driven roller, first angle detector means for detecting an angle of rotation of the first driven roller, second angle detector means for detecting an angle of rotation of the second driven roller, and a casing housing the rotatable ball, the first and second driven rollers, and the first and second angle detector means. The casing has a lower opening with the rotatable ball partly projecting downwardly therethrough for rolling movement on a base. The casing has at least one annular projection on a lower surface thereof for rejecting foreign matter. | |
