Electronic pen and electronic pen core body

1 . An electronic pen comprising:

a housing including an opening portion on a pen tip side of the housing on a first end in an axial direction of the housing,

wherein the opening portion has a pillar-shaped space with a predetermined length in the axial direction of the housing,

wherein the axial direction of the housing is a center line direction of the pillar-shaped space, and

wherein a hollow portion inside of the housing communicates with the pillar-shaped space of the opening portion;

a pen pressure detector arranged in the hollow portion of the housing; and

a core body including a tip portion on the first end in the axial direction of the housing, and an axial portion that extends from the tip portion toward a second end in the axial direction of the housing that is opposite the first end,

wherein part of the tip portion, in operation, protrudes outside of the housing from an opening on a pen tip side of the pillar-shaped space of the opening portion of the housing,

wherein the core body is installed such that the second end in the axial direction of the housing, in operation, transmits, to the pen pressure detector arranged in the hollow portion of the housing, pen pressure applied to the tip portion,

wherein the tip portion of the core body contains fibers bundled in the axial direction of the housing,

wherein the fibers bundled in the axial direction of the housing are exposed at a contact portion that, in operation, comes into contact with an input surface of a position detection sensor,

wherein at least part of the tip portion of the core body that faces an inner circumferential wall surface of the opening portion on the pen tip side of the housing is covered by a material harder than the fibers bundled in the axial direction of the housing, and

wherein the axial portion of the core body is not covered by the material harder than the fibers bundled in the axial direction of the housing.

2 . The electronic pen according to claim 1 , wherein

the axial portion is directly fitted to, or indirectly fitted through a pen pressure transmission member to, the pen pressure detector arranged in the hollow portion of the housing.

3 . The electronic pen according to claim 2 , wherein

the fibers bundled in the axial direction of the housing are felt.

4 . The electronic pen according to claim 3 , wherein

the axial portion contains felt integrated with the felt included in the tip portion, and

the felt of the axial portion and the felt included in the tip portion are obtained by compressing and fixing a felt material in the axial direction of the housing.

5 . The electronic pen according to claim 2 , wherein

the tip portion of the core body is thicker than the axial portion.

6 . The electronic pen according to claim 2 , wherein

the axial portion of the core body is configured to be inserted into a through hole of a magnetic core around which a coil is wound, and

an end portion of the axial portion of the core body inserted into the through hole of the magnetic core is directly fitted to, or indirectly fitted through the pen pressure transmission member to, the pen pressure detector.

7 . The electronic pen according to claim 1 , wherein

a thickness of a material at the at least part of the tip portion of the core body covered by the material harder than the fibers bundled in the axial direction of the housing is a predetermined thickness, and a pen tip side of the at least part of the tip portion of the core body becomes thinner toward the contact portion.

8 . The electronic pen according to claim 1 , wherein

the pen tip side of the housing is a tapered portion that becomes narrower toward an inner circumferential edge of the opening on the pen tip side of the pillar-shaped space of the opening portion.

9 . The electronic pen according to claim 8 , wherein

the tapered portion includes a first tapered portion that becomes thinner from a maximum diameter of the housing and a second tapered portion that becomes thinner than the first tapered portion on the pen tip side of the housing.

10 . The electronic pen according to claim 9 , wherein

a tilt angle of the second tapered portion with respect to the axial direction of the housing is larger than a tilt angle of the first tapered portion with respect to the axial direction of the housing.

11 . An electronic pen core body comprising:

a tip portion on a first end in an axial direction of the electronic pen core body; and

an axial portion that extends from the tip portion toward a second end in the axial direction of the electronic pen core body that is opposite the first end,

wherein part of the tip portion, in operation, protrudes outside of the electronic pen core body from an opening portion on a pen tip side of a housing of an electronic pen,

wherein the electronic pen core body is installed such that the second end in the axial direction of the electronic pen core body, in operation, transmits, to a pen pressure detector arranged in a hollow portion of the housing, pen pressure applied to the tip portion,

wherein the tip portion contains fibers bundled in the axial direction of the electronic pen core body,

wherein the fibers bundled in the axial direction of the electronic pen core body are exposed at a contact portion that, in operation, comes into contact with an input surface of a position detection sensor,

wherein at least part of the tip portion faces an inner circumferential wall surface of the opening portion on the pen tip side of the housing is covered by a material harder than the fibers bundled in the axial direction of the electronic pen core body, and

wherein the axial portion is not covered by the material harder than the fibers bundled in the axial direction of the electronic pen core body.

12 . The electronic pen core body according to claim 11 , wherein

the axial portion is directly fitted to, or indirectly fitted through a pen pressure transmission member to, the pen pressure detector arranged in the hollow portion of the housing.

13 . The electronic pen core body according to claim 12 , wherein

the fibers bundled in the axial direction of the electronic pen core body are felt.

14 . The electronic pen core body according to claim 13 , wherein

the axial portion contains felt integrated with the felt included in the tip portion, and

the felt of the axial portion and the felt included in the tip portion are obtained by compressing and fixing a felt material in the axial direction of the electronic pen core body.

15 . The electronic pen core body according to claim 12 , wherein

the tip portion is thicker than the axial portion.

16 . The electronic pen core body according to claim 12 , wherein

a tapered portion that becomes thicker from the axial portion toward the tip portion is formed at a boundary of the tip portion and the axial portion.