Patent ID: 8569636

Claim:
An angle correcting method for a position pointer inducted by a handwritten input device, comprising: providing an inclined angle table; inducing a first inducted voltage amplitude generated in a first position, where the position pointer touches, of the handwritten input device; inducing a second inducted voltage amplitude in a second position where is at a predetermined distance from the first position; calculating the ratio of the first inducted voltage amplitude to the second inducted voltage amplitude to generate an amplitude ratio; and determining whether the first position is located within a central area or not, wherein the handwritten input device has a writing area, which is divided into at least two parts, the central area and a border area, looking up the inclined angle table to find a corresponding inclined angle according to the amplitude ratio; whereby, the first position will be adjusted adaptively according to the inclined angle found, or the first inducted voltage amplitude inducted will be compensated adaptively, wherein the more difference of intensity between the first and the second inducted voltage amplitudes is, the bigger the inclined angle and the less difference of the intensity between the first and the second inducted voltage amplitudes is, the smaller the inclined angle found by looking up the inclined angle table is.