Abstract: A force sensing method, applied to a force sensing system comprising a plurality of force sensors and a touch sensing surface, comprising: (a) determining a first location of a first object on the touch sensing surface; (b) defining a first force sensing region according to the first location; and (c) computing a first system sensing force which the first object causes to the touch sensing surface according to the first location, and according to at least one sensor sensing force of a first part of the force sensors corresponding to the first force sensing region. The present invention also discloses a force sensing system which uses the above-mentioned force sensing method, and an efficient force sensor calibration method. Noises can be reduced and power consumption can be decreased, since only sensor sensing forces of force sensors near the object are used for computing the system sensing force.

Abstract: A magnetic device includes a core received in a housing and having three or more outer peripheral surfaces and having one end received in the housing and the other end facing out of the housing. Three or more magnetic members are attached onto the outer peripheral surfaces of the core and secured to the core and the housing with fasteners. The magnetic members include one pole arranged closer to the core and the other pole distal to the core, in order to increase the magnetic field intensity, and to form a unidirectional magnetic line of force, and for allowing the magnetic device to be strongly attracted onto various objects.