Patent ID: 9632596
Date: 2017-04-25
CPC Classifications: G06F

Claim:
1. A micro touch pen structure, comprising: a casing unit including a pen-shaped casing structure; a circuit unit disposed inside the pen-shaped casing structure; a first electromagnetic unit fixed inside the pen-shaped casing structure and electrically connected to the circuit unit, wherein the first electromagnetic unit includes a first hollow electromagnetic body fixed inside the pen-shaped casing structure and at least one electromagnetic coil wound around the first hollow electromagnetic body and electrically connected to the circuit unit; a pen core unit movably disposed inside the pen-shaped casing structure, wherein the pen core unit includes a first movable portion passing through the first hollow electromagnetic body, a second movable portion partially exposed from the pen-shaped casing structure, and a stop portion disposed between the first movable portion and the second movable portion; a second electromagnetic unit including a second hollow electromagnetic body fixed inside the pen-shaped casing structure and disposed around the first movable portion, wherein the second hollow electromagnetic body is fixed to the first movable portion and the stop portion, and is disposed between the first electromagnetic unit and the stop portion; and an elastic unit disposed inside the pen-shaped casing structure and between the first movable portion and a fixed structure that is disposed inside the pen-shaped casing structure, wherein the circuit unit includes at least one capacitor electrically connected to the circuit unit, and the first hollow electromagnetic body is larger than the second hollow electromagnetic body, wherein the first movable portion has a stop structure disposed between the first electromagnetic unit and the elastic unit, the stop structure is detachably disposed on an end portion of the first movable portion, the first hollow electromagnetic body has a through hole, and a diameter of the stop structure is large than a hole diameter of the through hole, and wherein the second movable portion includes a replaceable pen head cap partially enclosed within the pen-shaped casing structure and abutted against the stop portion, the replaceable pen head cap has an exposed annular concave portion disposed on an outer surface of the replaceable pen head cap, the replaceable pen head cap has at least two first retaining portions disposed on an inner surface of the replaceable pen head cap, and the second movable portion has at least two second retaining portions respectively mated with the at least two first retaining portions.