Patent ID: 7719516

Claim:
An actuator having an input function, comprising: a magnetic field generator that has different magnetic poles alternately arranged in a plane, with a predetermined position being the center of the magnetic poles; a coil holder that holds a plurality of coils that are radially arranged and face the magnetic field generator, relative motion in a planar direction being caused between the magnetic field generator and the coil holder; and an electromagnetic conversion unit that detects the relative motion and generates input planar coordinate data, and is mounted on one of the magnetic field generator and the coil holder, wherein: when the coil holder and the magnetic field generator are located in initial positions, the electromagnetic conversion unit is located in such a position as to face boundaries between the magnetic poles, or in such a position as not to face the magnetic poles of the magnetic field generator, the magnetic field generator further comprises: an opening located in the predetermined position, an upper yoke and a lower yoke, and the lower yoke comprises the opening, the coil holder has the electromagnetic conversion unit placed in such a position as to face the opening, and a size of the opening is within 80% to 120% of a size of a region in which the electromagnetic conversion unit moves.