Electronic pen including core structure, and electronic device including same
An electronic device is provided. The electronic device includes a housing and an electronic pen detachable from the housing, wherein the electronic pen includes a case, a pen tip disposed at one end of the case and protruded from the one end to an outside of the case, a rod extending from the pen tip into an inside of the case, a core including a first portion facing the one end of the case and including a first material, a second portion contacting the first portion and including a second material, and a through-hole penetrating the first and second portions and accommodating at least a portion of the rod, and a conductive coil surrounding at least a portion of the second portion, wherein a magnetic flux density of the first material is greater than a magnetic flux density of the second material.
1 . An electronic pen comprising:
a pen tip;
a core supporting the pen tip, the core including:
a first portion comprising a first material, and
a second portion comprising a second material, wherein the first portion of the core is closer to the pen tip than the second portion of the core; and
a conductive coil winding an exterior of the core,
wherein a saturation flux density of the first material is greater than a saturation flux density of the second material.
2 . The electronic pen of claim 1 ,
wherein magnetic permeability of the first material is smaller than magnetic permeability of the second material.
3 . The electronic pen of claim 1 ,
wherein the first material comprises metal powders, and
wherein the second material comprises ferrite.
4 . The electronic pen of claim 1 , further comprising:
a case defining an exterior of the electronic pen,
wherein the case includes:
a flat region extending in a longitudinal direction of the electronic pen, and
a curved region, extending from the flat region, defining an inside of the case together with the flat region.
5 . The electronic pen of claim 4 , wherein one cross section of the case has a track shape of which a length of a major axis is longer than a length of a minor axis.
6 . The electronic pen of claim 5 , wherein the length of the minor axis of the one cross section is smaller than a length corresponding to a thickness of a lateral side of an electronic device.
7 . The electronic pen of claim 5 , wherein the core has a track shape corresponding to the one cross section of the case to be disposed within the case.
8 . The electronic pen of claim 1 , further comprising:
a case defining an exterior of the electronic pen, and
a rod extending from the pen tip into an inside of the case.
9 . The electronic pen of claim 8 ,
wherein the core defines a through hole, penetrating the first portion of the core, and the second portion of the core, accommodating a portion of the rod.
10 . The electronic pen of claim 9 , further comprising:
a printed circuit board, and
a resonance circuit, disposed on the printed circuit board, including a variable capacitor,
wherein the variable capacitor is configured to change capacitance of the resonance circuit when the rod moves in a first direction as the pen tip is pressed or when the rod moves in a second direction opposite to the first direction as pressure is released.
11 . The electronic pen of claim 10 ,
wherein the first portion of the core includes a first region protruded in the second direction with respect to the conductive coil, and
wherein the second portion of the core includes a second region protruded in the first direction with respect to the conductive coil.
12 . The electronic pen of claim 8 , wherein the pen tip and the rod comprise a conductive material.
13 . The electronic pen of claim 1 ,
wherein the electronic pen interacts with an electromagnetic induction panel of a display of an electronic device.
14 . The electronic pen of claim 1 , wherein the conductive coil further surrounds at least a portion of the first portion.
15 . An electronic device comprising:
a housing; and
an electronic pen configured to be detachable from the housing, the electronic pen including:
a pen tip,
a core supporting the pen tip, the core including:
a first portion comprising a first material, and
a second portion comprising a second material, wherein the first portion of the core is closer to the pen tip than the second portion of the core, and
a conductive coil surrounding winding an exterior of the core,
wherein a saturation flux density of the first material is greater than a saturation flux density of the second material.
16 . The electronic device of claim 15 , further comprising:
a display including an electromagnetic induction panel electrically interacting with the electronic pen; and
a processor configured to obtain input information from an electronic interaction between the electronic pen and the electromagnetic induction panel.
17 . The electronic device of claim 16 ,
further comprising:
a magnet, disposed between the display and the housing, facing a lateral side of the housing.
18 . The electronic device of claim 15 ,
wherein the housing includes:
a first housing including a first surface and a second surface opposite to the first surface, and
a second housing including a third surface and a fourth surface opposite to the third surface, and
wherein the electronic device further comprises:
a hinge structure configured to provide a folded state in which the first surface and the third surface are facing each other or an unfolded state in which a direction toward which the first surface faces is corresponding to a direction toward which the third surface faces by rotatably coupling the first housing and the second housing, and
a flexible display, across the hinge structure, disposed on the first surface and the third surface.
19 . The electronic device of claim 18 , further comprising:
a first magnet disposed between the first surface and the second surface; and
a second magnet, disposed between the third surface and the fourth surface, facing the first magnet in the folded state,
wherein the first magnet is configured to maintain the folded state by having different polarity from the second magnet.
20 . A set of electronic devices comprising:
an electronic device including a housing; and
an electronic pen configured to be detachable from the housing of the electronic device, the electronic pen including:
a pen tip,
a core supporting the pen tip, the core including:
a first portion comprising a first material, and
a second portion comprising a second material, wherein the first portion of the core is closer to the pen tip than the second portion of the core, and
a conductive coil winding an exterior of the core, and
wherein a saturation flux density of the first material is greater than a saturation flux density of the second material.