Patent ID: 9535513
Date: 2017-01-03
CPC Classifications: G06F,H01F

Claim:
1. A thin electromagnetic handwriting pen, comprising: a casing of a thin pen-shaped casing structure including a first hollow outer tube, a second hollow outer tube, and a pen tail cover, the second hollow outer tube having two opposite lateral portions respectively mated with the first hollow outer tube and the pen tail cover, the second hollow outer tube having a stop portion disposed on the inner surface thereof; circuitry including a circuit substrate disposed inside the thin pen-shaped casing structure, the circuit substrate having an abutting portion abutted against the stop portion of the second hollow outer tube, the circuit substrate having at least two positioning holes and at least one positioning groove; an electromagnetic unit including a hollow holder and an electromagnetic coil wound around the hollow holder, wherein the electromagnetic unit is received in the thin pen-shaped casing structure, the hollow holder includes two coil guiding grooves extending along an axis of the thin pen-shaped casing structure, and the electromagnetic coil is fixed between the thin pen-shaped casing structure and the hollow holder and electrically connected to the circuit substrate with two end portions of the electromagnetic coil guided through the two coil guiding grooves, respectively, and connected to the circuit substrate; a pen core including a metal pen core structure, which is movably disposed inside the thin pen-shaped casing structure and passing through the hollow holder, and a plastic pen head connected to a distal end of the metal pen core structure, wherein a distal portion of the plastic pen head is exposed outside the first hollow outer tube of the thin pen-shaped casing structure; a connector including a connection structure disposed inside the thin pen-shaped casing structure and positioned on the circuit substrate, wherein a radial footprint of the connection structure, transverse to the axis of the thin pen-shaped casing structure, is substantially equal to a radial footprint of the pen core, the connection structure has at least two positioning posts respectively passing through the at least two positioning holes of the circuit substrate and at least one positioning block received in the at least one positioning groove of the circuit substrate, the connection structure has a convex post extending along the axis; and an elastic structure disposed inside the thin pen-shaped casing structure and disposed between the metal pen core structure and the convex post of the connection structure, wherein a radial footprint of the elastic structure is substantially equal to the radial footprint of the pen core, the elastic structure including a first elastic element disposed around the convex post and a second elastic element disposed in contact with the first elastic element and between the convex post and the metal pen structure.