CN117453053A

CN117453053A - Electronic pen and electronic pen main body

Info

Publication number: CN117453053A
Application number: CN202310671647.6A
Authority: CN
Inventors: 神山良二
Original assignee: Wacom Co Ltd
Current assignee: Wacom Co Ltd
Priority date: 2022-07-25
Filing date: 2023-06-07
Publication date: 2024-01-26

Abstract

The present invention relates to an electronic pen and an electronic pen body, which prevent a member that is not intended to be in contact with an inner wall surface of a pen housing at a pen tip side of the electronic pen body from being in contact with the inner wall surface of the pen housing. The device is provided with: a tubular pen housing; and an electronic pen body part having a tubular body part housing which can be accommodated in the hollow part of the pen housing, wherein a core is mounted on one end side of the body part housing in the axial direction, and the other end side of the body part housing in the axial direction is locked in the pen housing. An extension portion protruding in a direction intersecting the axial direction of the main body housing is formed at a predetermined position in the axial direction of the outer peripheral portion of the main body housing of the electronic pen main body. A stopper is formed on an inner wall surface of the hollow portion of the pen housing, and engages with the protruding portion of the body housing in a state in which the tip end side of the core is exposed to the outside from the opening of the pen housing, thereby preventing the movement of the electronic pen body to the pen tip side in the pen housing.

Description

Electronic pen and electronic pen main body

Technical Field

The present invention relates to an electronic pen having an electronic pen body accommodated in a pen case, and to the electronic pen body.

Background

In recent years, electronic pens have become so-called pen cores due to diversification of the overall shape (outer case) (design importance). In order to realize a cartridge-type electronic pen, an electronic pen has been proposed in which an electronic pen body having a position indication function with respect to a position detection sensor, a pen pressure detection function, and the like, which are main functions of the electronic pen, is housed in a pen case as a cartridge for the electronic pen (see patent document 1 (WO 2016/158418), and the like).

Since such an electronic pen can be configured by simply housing and assembling the electronic pen body portion in the hollow portion of the tubular pen case, the electronic pen body portion can be easily replaced, and the electronic pen can be made very convenient in terms of a knock-type structure, as in the refill of a ball-point pen.

Prior art literature

Patent literature

Patent document 1: WO2016/158418

Disclosure of Invention

Problems to be solved by the invention

In the electronic pen as described above, the electronic pen body is configured to be held in the pen housing by being fitted to a fitting portion provided in the pen housing at a rear end side of the electronic pen body opposite to the pen point side in the axial direction. Therefore, the pen tip side of the electronic pen body is freely movable, and a member that does not want to contact the pen inner wall surface of the pen case at the pen tip side of the electronic pen body may contact the pen inner wall surface.

In addition, a core is mounted on the pen tip side of the electronic pen main body, and the tip end of the mounted core protrudes from the opening on the pen tip side of the pen housing when the electronic pen is in use. In this case, in the electronic pen as described above, the length of the portion of the electronic pen body portion to which the core is attached, which protrudes from the opening on the pen tip side of the pen housing, is a length corresponding to the fitting amount of the rear end portion of the electronic pen body portion into the fitting portion in the pen housing, and there is a variation. Due to this deviation, a member that does not want to be brought into contact with the inner wall surface of the pen housing at the pen tip side of the electronic pen main body part may also be brought into contact with the inner wall surface of the pen housing.

In the case of a knock-type electronic pen, when the pen point is pushed out by a knock operation and when the pen point is in a reset state stored in the pen housing, in the structure of the conventional knock-type cam mechanism using a rotating cam, the pen point side of the electronic pen main body portion is operated to temporarily protrude more than the amount of the pen point protruding from the opening of the pen housing at the pen point side at the time of use of the electronic pen, and therefore, there is a possibility that a member which does not want to be brought into contact with the inner wall surface of the pen housing at the pen point side of the electronic pen main body portion is brought into contact with the inner wall surface of the pen housing.

As an example of a member which is not intended to be brought into contact with the inner wall surface of the pen case at the pen tip side of the electronic pen main body portion, for example, a coil wound around a magnetic core in the case of an electromagnetic induction type electronic pen is given. That is, in the case of an electromagnetic induction type electronic pen, a coil wound around a magnetic core is disposed near the pen tip side, but if the coil is in contact with the inner wall surface of the pen housing, a load is applied to the coil at the contact portion, and the magnetic flux for coupling with the position detection sensor by electromagnetic induction becomes unstable, which may adversely affect the interaction characteristics between the electronic pen and the position detection sensor.

The present invention aims to provide an electronic pen capable of solving the above problems.

Means for solving the problems

In order to solve the above-described problems, there is provided an electronic pen comprising:

a tubular pen housing having an opening at a pen tip side and a hollow portion inside; and

An electronic pen main body part having a tubular main body part housing which can be accommodated in the hollow part of the pen housing, a core body being mounted on one end side in an axial direction of the main body part housing, the other end side in the axial direction of the main body part housing being locked in the pen housing,

An extension portion extending in a direction intersecting the axial direction of the main body housing is formed at a predetermined position in the axial direction of the outer peripheral portion of the main body housing of the electronic pen main body,

a stopper portion is formed on an inner wall surface of the hollow portion of the pen housing, and is engaged with the protruding portion of the body housing in a state where a tip end side of the core is exposed to the outside from the opening of the pen housing, thereby preventing movement of the electronic pen body toward the pen tip side in the pen housing.

In the electronic pen having the above-described configuration, the protruding portion provided on the outer peripheral portion of the body portion case of the electronic pen body portion is engaged with the stopper portion provided on the inner wall surface of the pen case, and movement of the electronic pen body portion to the pen point side is prevented. Therefore, according to the electronic pen having the above-described structure, the member which is not intended to be brought into contact with the inner wall surface of the pen housing at the pen tip side of the electronic pen main body portion can be prevented from being brought into contact with the inner wall surface of the pen housing of the electronic pen.

Drawings

Fig. 1 is a diagram for explaining an embodiment of an electronic pen and an embodiment of an electronic pen body according to the present invention.

Fig. 2 is a diagram for explaining a structural example of the pen tip side of the embodiment of the electronic pen and the embodiment of the electronic pen main body.

Fig. 3 is a diagram for explaining a configuration example of the pen tip side of the embodiment of the electronic pen body.

Fig. 4 is a diagram for explaining the operation of the pen tip side at the time of the tapping operation of the conventional tapping type electronic pen as a comparative example of the embodiment of the electronic pen of the present invention.

Fig. 5 is a diagram for explaining the pen-tip-side operation at the time of the tapping operation in the electronic pen according to the embodiment of the present invention.

Fig. 6 is a cross-sectional view for explaining another embodiment of the electronic pen of the present invention.

Fig. 7 is a view for explaining another embodiment of the electronic pen body part of the present invention.

Detailed Description

Hereinafter, an embodiment of the electronic pen of the present invention will be described with reference to the drawings together with an embodiment of the electronic pen body.

Fig. 1 is a diagram showing a structural example of an embodiment of an electronic pen according to the present invention, which is an electromagnetic induction type electronic pen. In the electronic pen 1 of this embodiment, the main functions of the electronic pen such as a position indication function and a pen pressure detection function with respect to the position detection sensor are housed in the electronic pen body 3 as a pen refill for the electronic pen, and the electronic pen 1 has a knock-type structure in which the pen tip side of the electronic pen body 3 is moved in and out from the opening 2b side of one end in the longitudinal direction of the pen housing 2. In this embodiment, the electronic pen body 3 is detachable from the pen housing 2.

Fig. 1 (a) shows a state in which the entire electronic pen body 3 is housed in the hollow portion 2a of the pen housing 2, and fig. 1 (B) shows a state in which the pen tip side of the electronic pen body 3 is pushed out from the opening 2B of the pen housing 2 by a tapping cam mechanism 10 described later. In fig. 1 (a) and (B), a pen case 2 as an electronic pen 1 is made of a transparent synthetic resin, and the inside thereof is shown in a transparent state. Fig. 1 (C) is a diagram showing a configuration example of the electronic pen body 3 according to this embodiment.

As shown in fig. 1 (a) and (B), the pen case 2 of the electronic pen 1 of this embodiment has a cylindrical (in this example, cylindrical) shape. The pen housing 2 has a hollow portion 2a therein, and one end side in the axial direction thereof is a nib side which becomes gradually thinner, and an opening 2b is provided at a front end portion thereof. As shown in fig. 1 a and B, in the electronic pen 1 of this embodiment, the electronic pen body 3 is housed in the hollow portion 2a of the tubular pen housing 2, and the pen tip side of the electronic pen body 3 is moved in and out from the opening 2B side of one end in the longitudinal direction of the pen housing 2 by the tapping cam mechanism 10 provided on the other end side (hereinafter referred to as the rear end side) in the axial direction of the pen housing 2.

In this example, as shown in fig. 1 (a) and (B), the pen housing 2 is configured by joining a pen tip housing portion 21 on one end side in the axial direction and a rear end housing portion 22 on the other end side in the axial direction at a joining portion 23. In this example, the joint portion 23 is formed by screwing the pen-tip-side housing portion 21 into the rear-end-side housing portion 22.

Note that, the coupling between the pen tip side housing portion 21 and the rear end side housing portion 22 may be not a coupling by screwing as in this example, but may be a structure as follows: an annular convex portion is formed in one of the pen tip side housing portion 21 and the rear end side housing portion 22, and an annular concave portion is formed in the other, and the other is press-fitted to one of the pen tip side housing portion 21 and the rear end side housing portion 22, and the annular concave portion is fitted to the annular convex portion to be coupled thereto.

In this example, as shown in fig. 1 (a) and (B), the tapping cam mechanism portion 10 is provided in the rear end side housing portion 22 of the pen housing 2. The tapping cam mechanism 10 has the same structure as a known commercially available tapping cam function of a ball-point pen. That is, as shown in fig. 1 (a) and (B), the tapping cam mechanism 10 has a known structure in which a cam body 11, a tapping rod 12, and a rotating member 13 are combined. The cam body 11 is formed on the inner wall surface of the rear end side housing 22. The tapping rod 12 is configured such that the end portion 12a protrudes from the rear end side opening 2c of the pen housing 2, which is an opening on the opposite side of the pen tip side of the rear end side housing portion 22, so as to be able to receive a tapping operation by a user.

In fig. 1 a and B, the coil spring 5 is a return spring (hereinafter referred to as return spring 5) for returning the pen tip side of the electronic pen body 3 from the pushed-out state protruding as shown in fig. 1B to the non-pushed-out state shown in fig. 1 a by a tap operation.

The rotator 13 includes an electronic pen body portion holding portion 13a, and the electronic pen body portion holding portion 13a includes a fitting recess portion 13J into which a fitting protrusion 3P (see the broken line of fig. 1 (a) and (B) and fig. 1 (C)) provided on the rear end side of the electronic pen body portion 3 fits.

In this embodiment, the fitting protrusion 3P at the rear end of the electronic pen body 3 is fitted into the fitting recess 13J of the electronic pen body holding portion 13a of the rotating member 13 of the tapping cam mechanism portion 10 provided in the rear end side housing portion 22, and the electronic pen body 3 is locked to the rear end side housing portion 22. Then, the electronic pen 1 is configured by inserting the electronic pen body 3 into the pen-tip-side housing 21 from the rear end side of the pen-tip-side housing 21, and coupling the pen-tip-side housing 21 to the rear-end-side housing 22. The electronic pen body 3 is detachable from the electronic pen body holding portion 13a of the rotator 13 of the tapping cam mechanism 10.

As shown in fig. 1 (C), the electronic pen body 3 of this embodiment is constituted by a core 30, a signal transmission member 40, a body housing 50, and an elastic displacement portion 60 provided between the body housing 50 and the fitting protrusion 3P in this example. The main body case 50 is composed of a holder portion 51 and a protection cover portion 52, the holder portion 51 holds the pen pressure detecting portion 71 and the circuit board 72 on which the electronic circuit is disposed, and the protection cover portion 52 has a function of accommodating and protecting the pen pressure detecting portion 71 and the circuit board 72 held by the holder portion 51.

The core 30 is made of a relatively hard and elastic resin material, for example, POM (Polyoxymethylene), and in this example, a tip portion 30a having a larger diameter than the shaft center portion is formed on the tip side of the rod-like shaft center portion.

The signal transmission member 40 is composed of a coil 41 constituting a resonance circuit for transmitting and receiving signals to and from the position detection device by electromagnetic induction, and a magnetic core (ferrite core 42 in this example) around which the coil 41 is wound. A through hole 42a is formed in the ferrite core 42 in the axial direction.

The diameter of the through hole 42a of the ferrite core 42 is larger than the diameter of the axial center portion of the core 30, and the axial center portion of the core 30 is inserted into the through hole 42a and fitted into the pen pressure detecting portion 71. In this case, the tip end 30a of the core 30 protrudes as a pen point from the ferrite core 42, and the end 30b on the rear end side of the shaft portion of the core 30 is fitted into the pen pressure detecting portion 71. Thus, the pressure (pen pressure) applied to the tip end portion 30a of the core 30 is applied to the pen pressure detecting portion 71. The core 30 is detachable from the pen pressure detecting portion 71.

The pen pressure detection unit 71 is configured by using a mechanism for changing the capacitance of the capacitance variable capacitor according to the applied pressure (pen pressure), for example (see, for example, patent document (japanese patent application laid-open No. 2011-186803)). The pen pressure detecting unit 71 may be configured by using a semiconductor chip including a MEMS (Micro Electro Mechanical Systems: microelectromechanical system) element as the capacity variable capacitor (for example, refer to patent document (japanese patent application laid-open No. 2013-161307)). The structure of the pen pressure detecting portion 71 is not limited to the structure of this example.

An electronic component such as a capacitor that constitutes a resonant circuit together with the coil 41 is mounted on the circuit board 72, and in this example, a conductor pattern for connecting the voltage detection unit 71 of the capacitance variable capacitor to the resonant circuit is formed.

The holder portion 51 of the main body case 50 is made of, for example, a resin material, and includes a cylindrical portion (not shown) that fits into the ferrite core 42 of the signal transmission member 40 and holds the pen pressure detecting portion 71, and a circuit board mounting table portion (not shown) that mounts and holds the circuit board 72.

The protective cover 52 of the main body case 50 is made of a tube-shaped member made of a hard material (in this example, a tube-shaped member made of metal), and is a circuit portion protective member for protecting the circuit components of the pen pressure detecting portion 71 and the circuit board 72 held by the holder 51.

That is, the main body case 50 is configured by coupling the bracket portion 51 and the protective cover portion 52 in the axial direction in a state where a part of the cylindrical portion of the bracket portion 51 holding the pen pressure detecting portion 71 and the circuit board mounting table portion are housed in the hollow portion of the protective cover portion 52. In this case, as shown in fig. 1 (C), the diameter of the cylindrical portion of the holder portion 51 and the diameter of the pipe-shaped member constituting the protection cover portion 52 are equal to each other, R0.

As shown in fig. 1 (C), the elastic displacement portion 60 is configured by loosely fitting a rod-like member 61 made of, for example, resin, which is smaller than the inner diameter of the protection cover portion 52 of the main body portion case 50 in a state in which the coil spring 62 is stretchable in this example, and is provided on the rear end side of the protection cover portion 52 of the main body portion case 50 in this example.

In this case, one end portion 61a of the rod-like member 61 in the axial direction has a diameter slightly larger than the intermediate portion 61m of the rod-like member 61 in which the coil spring 62 is loosely fitted, and the inner diameter of the opening 52a on the rear end side of the protection cover portion 52 is slightly smaller than the diameter of one end portion 61a of the rod-like member 61 in the axial direction. The rod-like member 61 is attached to the cover 52 such that one end 61a is located on the opening 52a side of the rear end in the hollow portion of the cover 52, and the intermediate portion 61m and the other end 61b in the axial direction are exposed to the outside of the cover 52.

The relationship between the one end portion 61a of the rod-shaped member 61 and the inner diameter of the opening 52a on the rear end side of the protection cover 52 prevents the rod-shaped member 61 from being separated from the opening 52a on the rear end side of the protection cover 52 in a state where it is attached to the rear end side of the protection cover 52. However, since the diameter of the rod-shaped member 61 is smaller than the inner diameter of the protective cover portion 52, one end portion 61a side of the rod-shaped member 61 is movable toward the pen tip side in the hollow portion of the protective cover portion 52.

The other end portion 61b of the rod-shaped member 61 in the axial direction is configured to have a larger diameter than the intermediate portion 61m of the rod-shaped member 61 into which the coil spring 62 is loosely fitted, and in this example, the diameter of the end portion 61b is selected to be equal to the diameter R0 of the main body housing 50. In this example, a fitting protrusion 3P on the rear end side of the electronic pen body 3 is formed in the center of the circular end surface of the other end 61b of the rod-shaped member 61.

The diameter of the coil spring 62 is selected to be larger than the diameter of the intermediate portion 61m of the rod-like member 61 and smaller than the diameter R0 of the protective cover portion 52 and the other end portion 61b of the rod-like member 61. Accordingly, the coil spring 62 is held in the intermediate portion 61m between the end portion of the main body housing 50 on the rear end side of the protection cover portion 52 and the other end portion 61b of the rod-like member 61. In this holding state, the coil spring 62 is in a state of elastically biasing the end portion on the rear end side of the protection cover portion 52 of the main body portion case 50 and the other end portion 61b of the rod-like member 61 by its elastic restoring force.

In this embodiment, as described above, the elastic displacement portion 60 is attached to the rear end side of the body portion case 50, thereby forming the electronic pen body portion 3 as shown in fig. 1 (C). When a load of a predetermined value or more is applied to the electronic pen body 3 so that the axial length thereof is contracted against the elastic displacement force of the elastic displacement portion 60, the coil spring 62 of the elastic displacement portion 60 is elastically contracted, and one end portion 61a side of the rod-like member 61 is displaced toward the pen tip side within the guard portion 52. When such a load is removed, the coil spring 62 elastically returns to its extended state, and the axial length of the electronic pen body 3 returns to its original state shown in fig. 1 (C).

In this case, the elastic characteristic of the coil spring 62 is insensitive to the load in the range of the pen pressure applied to the tip end portion 30a of the core 30 at the time of use of the electronic pen 1. That is, the elastic characteristic of the coil spring 62 is insensitive to the load of the range of the pen pressure value detected by the pen pressure detecting portion 71. The coil spring 62 is elastic in the expansion and contraction described above when a load by a user's tapping operation is applied to the electronic pen 1 or when an impact load is applied to the electronic pen 1 that is greater than a load in the range of the pen pressure applied to the tip end portion 30a of the core 30 during use of the electronic pen 1.

The elastic displacement portion 60 is detachable from the protective cover portion 52 of the electronic pen main body portion 3.

The spring characteristic of the return spring 5 in the above-described knock cam mechanism is similar to that of a return spring used in a general knock ball point pen or the like, and the spring characteristic is smaller than the coil spring 62 of the elastic displacement portion 60.

As shown in fig. 1 (a), (B), and (C), in the electronic pen body 3 of this embodiment, a protruding portion 80 that protrudes from the outer peripheral side of the body housing 50 in a direction intersecting the axial direction (in this example, a direction orthogonal to the axial direction) is provided at a predetermined position between one end side of the axial direction of the body housing 50 and the other end side of the axial direction. The protruding portion 80 has an end surface in a direction intersecting the axial direction (in this example, a direction orthogonal to the axial direction) as an end surface on the pen tip side of the protruding portion. In this embodiment, the extension portion 80 is provided in the holder portion 51 of the main body portion housing 50 on the pen tip side. The extension 80 may be integrally formed with the housing of the holder portion 51, or may be formed separately from the holder portion 51.

In this case, the extension portion 80 may be formed to extend in a direction perpendicular to the axial direction over the entire circumference of the outer peripheral portion of the holder portion 51, but in this embodiment, as shown in fig. 2, it is formed to extend in a direction perpendicular to the axial direction in a portion where the diameters of the holder portion 51 are 180 degrees apart from each other. The tip end portion of the protruding portion 80 in the axial direction has a circular arc shape so as to be shaped along the inner wall surface of the pen case 2. The constitution is as follows: the contact portion between the tip portion of the protruding portion 80 in the axial direction and the inner wall surface of the pen case 2 is reduced as much as possible, so that the electronic pen main body 3 is easily moved in the axial direction in the pen case 2 when receiving an impact load during the tapping operation.

In this embodiment, since the extension 80 is formed on the outer periphery of the main body case 50 so as to extend from the portions having an angular range different from each other by 180 degrees, the wire portion connecting the coil 41 constituting the resonant circuit and the capacitor on the circuit board 72 can pass through the portion other than the extension 80, and does not rub against the inner wall surface of the pen case 2. In this regard, too, the trouble in the knock-type electronic pen 1 can be reduced.

In this embodiment, as shown in fig. 1 (a) and (B), the inner wall surface of the pen housing 2 (in this embodiment, the inner wall surface of the pen-tip-side housing portion 21) is formed with a stepped portion 2d as an example of a stopper portion for engaging with an end surface of the pen-tip side of the extension portion 80 of the main body housing 50 provided in the electronic pen main body 3, which is orthogonal to the axial direction in this example, to prevent the movement of the electronic pen main body 3 to the pen-tip side of the pen housing 2.

In the electronic pen 1, the length (predetermined protruding length) of the pen tip side of the electronic pen body 3 in the axial direction protruding outward from the opening 2b of the pen housing 2 at the time of writing on the input surface of the position detection sensor should be predetermined in consideration of the ease of input operation by the user, and the like.

In this embodiment, the protruding portion 80 provided in the main body portion case 50 of the electronic pen main body portion 3 and the stepped portion 2d formed on the inner wall surface of the pen case 2 are formed to engage when the protruding length of the pen tip side of the electronic pen main body portion 3 from the opening 2b of the pen case 2 becomes the predetermined protruding length Lp described above.

The relationship between the formation position of the protruding portion 80 provided in the body portion case 50 of the electronic pen body portion 3 and the formation position of the step portion 2d formed on the inner wall surface of the pen case 2 in this embodiment will be further described with reference to fig. 3.

Fig. 3 (a) is a cross-sectional view of the pen tip side of the pen housing 2 at the pen tip side housing portion 21, and fig. 3 (B) is a view showing the pen tip side of the electronic pen main body portion 3.

As shown in fig. 3 (B), the electronic pen body 3 is configured such that the signal transmission member 40 including the ferrite core 42 around which the coil 41 is wound is attached to the holder 51 on the pen tip side of the body housing 50 having the outer diameter R0, and the core 30 is inserted through the through hole 42a of the ferrite core 42, and fitted into the pen pressure detecting portion 71 disposed on the holder 51.

In this example, as shown in fig. 3 (B), the outer diameter R1 of the ferrite core 42 is smaller than the outer diameter R0 of the main body case 50. The outer diameter R2 of the portion of the ferrite core 42 around which the coil 41 is wound is equal to or smaller than the outer diameter R0 of the main body case 50. That is, R1< R2.ltoreq.R0.

As shown in fig. 3 (a), the diameter R3 of the opening 2B on the pen tip side of the pen housing 2 (pen tip side housing portion 21) is slightly larger than the outer diameter R1 of the ferrite core 42 of the electronic pen main body portion 3, and as shown in fig. 1 ((B), the electronic pen is configured such that, in this example, not only the core 30 but also a part of the ferrite core 42 is exposed to the outside from the opening 2B at the time of use of the electronic pen 1.

As shown in fig. 3 (B), the length from the tip end of the tip end portion 30a of the core 30 to a part of the ferrite core 42 on the pen tip side in the axial direction is determined so as to be the predetermined protruding length Lp. As shown in fig. 3 (B), the length from the tip end of the tip end portion 30a of the core 30 to the end face of the pen point side of the extension portion 80 of the holder portion 51 of the electronic pen main body portion 3 in the axial direction is Lz.

On the other hand, as shown in fig. 3 (a), the inner diameter R4 of the hollow portion of the pen tip portion of the pen housing 2 communicating with the opening 2b is slightly larger than the outer diameter R0 of the electronic pen main body 3, and the signal transmitting member 40 is configured not to contact the inner wall surface of the pen tip housing 21 in the hollow portion of the inner diameter R4. In this example, as shown in fig. 3 (a), the hollow portion of the pen tip side housing portion 21 has a taper in which the diameter gradually decreases from the portion of the inner diameter R4 to the opening 2b of the diameter R3. Therefore, if the portion of the coil 41 of the electronic pen body 3 is located at the tapered portion, the coil 41 may contact the inner wall surface of the tapered portion.

Therefore, in this example, as shown in fig. 3 (a) and (B), the length from the position separated from the front end of the core 30 of the electronic pen main body 3 by the predetermined protruding length Lp on the rear end side to the end of the tip side of the winding portion of the coil 41 in the axial direction is equal to the length L2 from the front end of the opening 2B of the tip side case portion 21 of the pen case 2 to the tip side end of the inner diameter R4 via the taper portion.

As shown in fig. 3 (a) and (B), the inner diameter of the hollow portion of the pen tip housing portion 21 on the rear end side of the front end of the opening 2B of the pen tip housing portion 21 of the pen housing 2 is set to be larger than the inner diameter R4 and the outer diameter R0 by a distance L1 (=lz-Lp) equal to Lz-Lp. Thus, the stepped portion 2d is formed at a position separated from the front end of the opening 2b of the pen tip side housing portion 21 of the pen housing 2 by a length L1 (=lz-Lp) equal to Lz-Lp.

Therefore, as shown in fig. 3 (a), in the pen housing 2 of the electronic pen 1 of this embodiment, the length of the portion on the pen tip side which becomes the diameter R4 becomes the length L3 (=l1—l2). In a state where the pen tip side of the electronic pen body 3 protrudes by a predetermined protruding length Lp, the coil 41 of the electronic pen body 3 shown in fig. 3 (B) is located at a portion of the hollow portion 2a having a length L3 of the diameter R4. Therefore, the coil 41 does not contact the inner wall of the hollow portion 2a of the pen housing 2. Therefore, the signal transmission member 40 can be coupled to the position detection sensor with stable magnetic flux without applying an unnecessary load due to contact to the coil 41.

The diameter of the arc portion at the tip of the projecting portion 80 in the projecting direction formed in the holder portion 51 of the main body portion housing 50 of the electronic pen main body portion 3 is a diameter R6 which is larger than the inner diameter R4 of the hollow portion of the pen-side housing portion 21 of the pen housing 2 on the pen-side than the step portion 2d and is substantially equal to or slightly smaller than the inner diameter R5 of the pen-side housing portion 21 of the pen housing 2. That is, R4< R6.ltoreq.R5.

With the above configuration, as shown in fig. 1 (B), the protruding portion 80 of the electronic pen body 3 engages with the stepped portion 2d of the inner wall surface of the pen-tip-side housing portion 21 of the pen housing 2, so that the electronic pen body 3 is prevented from moving to the pen tip side in the hollow portion 2a of the pen housing 2. In this state, the core body 30 and a part of the ferrite core 42 on the pen tip side of the electronic pen body 3 can protrude to the outside by a predetermined protruding length Lp from the opening 2b of the pen case 2.

Therefore, the electronic pen 1 is always kept in a state in which the pen tip side thereof protrudes outward from the opening 2b by the predetermined protruding length Lp, and it is possible to avoid the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2 at the pen tip side of the electronic pen body 3, from being brought into contact with the inner wall surface of the pen housing 2.

In this embodiment, the diameter of the arc-shaped portion provided at the tip of the protruding portion 80 of the electronic pen body 3 in the protruding direction is substantially equal to or slightly smaller than the diameter R6 of the inner diameter R5 of the pen tip-side housing portion 21 of the pen housing 2, so that the electronic pen body 3 is also prevented from being displaced in the direction orthogonal to the axial direction. Therefore, the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2 at the pen tip side of the electronic pen main body section 3, can also be prevented from being brought into contact with the inner wall surface of the pen housing 2.

In the electronic pen 1 of this embodiment, the protruding portion 80 of the electronic pen body 3 is engaged with the stepped portion 2d of the inner wall surface of the pen-tip-side housing portion 21 of the pen housing 2, so that the pen-tip side of the electronic pen body 3 does not protrude outward from the opening 2b of the pen housing 2 by the predetermined protruding length Lp or more, and therefore, even in the case of a tapping operation, it is possible to prevent the protruding by the predetermined protruding length or more, and in this point, it is also possible to avoid the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2 at the pen-tip side of the electronic pen body 3, from being brought into contact with the inner wall surface of the pen housing 2.

The operation of the electronic pen 1 of this embodiment at the pen tip side during the tapping operation will be described in comparison with the operation of the conventional electronic pen 1PR at the pen tip side.

Fig. 4 is a diagram for explaining the pen tip-side operation of the electronic pen body 3PR at the time of the tapping operation of the conventional tapping electronic pen 1 PR. Fig. 4 (a) shows a non-pushed-out state in which the pen tip side of the electronic pen main body section 3PR is housed in the pen housing 2 PR. Fig. 4 (B) shows a state in which the user of the electronic pen 1PR presses the tapping rod 12PR of the tapping cam mechanism portion 10PR from the state of fig. 4 (a) to protrude the pen tip side of the electronic pen main body portion 3PR by a predetermined protruding length Lp from the opening of the pen housing 2 PR.

In the conventional knock-type electronic pen 1PR, in the state of fig. 4B, the pushing operation of the pen tip portion of the electronic pen main body portion 3PR is not completed, and when the pushing operation of the knock bar 12PR is stopped, the electronic pen main body portion 3PR returns to the non-pushed state of fig. 4 a by the elastic displacement force of the return spring (not shown in fig. 4) of the knock cam mechanism portion 10 PR.

From the state shown in fig. 4 (B), the user further pushes in the tapping rod 12PR, and as shown in fig. 4 (C), the pen tip of the electronic pen main body portion 3PR is projected from the opening of the pen housing 2PR by a predetermined projection length Lp or more. Then, the rotary member of the tapping cam mechanism portion 10PR rotates, and as shown in fig. 4 (D), the tapping cam mechanism portion 10PR is locked in a state in which the pen tip portion of the electronic pen main body portion 3PR protrudes from the opening of the pen housing 22PR by a predetermined protruding length Lp, and the operation is completed.

Then, when the tapping rod 12PR is further pressed from the use state of the electronic pen 1PR in which the pen tip is pushed out by the predetermined protruding length Lp in fig. 4D, and the pen tip of the electronic pen main body 3PR is again protruded from the opening of the pen housing 2PR by the predetermined protruding length Lp or more as shown in fig. 4E, the rotating member of the tapping cam mechanism 10PR is rotated, the locked state by the pressing is released, and the electronic pen main body 3PR is restored to the non-pressed state in which the pen tip of the electronic pen main body 3PR is housed in the pen housing 2PR as shown in fig. 4 a by the elastic displacement force of the return spring (not shown in fig. 4) of the tapping cam mechanism 10 PR.

As described above, in the case of the conventional knock-and-click type electronic pen 1PR, as shown in fig. 4 (C) and (E), it is necessary to move the electronic pen body 3PR toward the opening side of the pen case 2PR so that the pen tip of the electronic pen body 3PR protrudes by a protruding length larger than the predetermined protruding length Lp, and in these states, the coil of the signal transmission member, which is an example of a member that does not want to be in contact with the inner wall surface of the pen case 2PR at the pen tip side of the electronic pen body 3PR, may be in contact with the inner wall surface of the pen case 2PR due to long-term use.

Next, the operation of the electronic pen body 3 at the pen tip side in the tapping operation of the tapping electronic pen 1 according to this embodiment will be described with reference to fig. 5. Fig. 5 (a) shows a non-pushed-out state in which the pen tip side of the electronic pen main body section 3 is housed in the pen case 2. In this state, the step portion 2d of the pen housing 2 and the extension portion 80 of the electronic pen main body portion 3 are separated from each other, and are not engaged with each other.

When the user of the electronic pen 1 presses down the tapping rod 12 of the tapping cam mechanism 10 against the elastic force of the return spring 5 from the state shown in fig. 5 (a), the pen tip side of the electronic pen body 3 is projected by the predetermined projection length Lp from the opening of the pen housing 2 as shown in fig. 5 (B), the step portion 2d of the pen housing 2 engages with the projecting portion 80 of the electronic pen body 3, and the pen tip side of the writing input electronic pen body 3 is not further moved in the direction projecting from the opening in the pen tip side housing 21.

However, in the state of fig. 5B, the pressing operation of the pen tip portion of the electronic pen main body portion 3 is not completed, and when the pressing operation of the tapping rod 12 is stopped, the electronic pen main body portion 3 returns to the non-pressed state of fig. 5 a by the elastic displacement force of the return spring 5 (not shown in fig. 5) of the tapping cam mechanism portion 10.

When the user presses the tapping rod 12 toward the pen tip with a pressure (load) smaller than the elastic displacement force of the coil spring 62 of the elastic displacement portion 60 although the pressure (load) is against the elastic displacement force of the return spring 5 from the state shown in fig. 5 (B), the stepped portion 2d of the pen housing 2 and the protruding portion 80 of the electronic pen main body 3 engage with each other, and therefore the rotator portion 13 cannot be moved toward the pen tip.

When the user presses the tapping rod 12 by applying a large pressure (load) against the elastic displacement force of the coil spring 62 of the elastic displacement portion 60 from the state shown in fig. 5 (B), the step portion 2d of the pen housing 2 engages with the protruding portion 80 of the electronic pen body 3, so that the protruding length of the pen tip side of the electronic pen body 3 is still a predetermined protruding length Lp, but as shown in fig. 5 (C), the coil spring 62 of the elastic displacement portion 60 of the electronic pen body 3 is contracted, and the elastic displacement portion 60 is contracted in the axial direction. Then, according to this, the rotary member 13 of the tapping cam mechanism portion 10 moves in the axial direction and rotates, and the tapping cam mechanism portion 10 is locked in a state in which the pen tip portion of the electronic pen main body portion 3 protrudes from the opening of the pen housing 2 by the prescribed protruding length Lp. Then, as shown in fig. 5 (D), the coil spring 62 of the elastic displacement portion 60 of the contracted electronic pen main body portion 3 is restored to the original state, and the contracted elastic displacement portion 60 is restored to the original length state. Then, the electronic pen 1 is in a use state in which the pen tip portion is pushed out by a predetermined protruding length Lp, and the pushing-out of the pen tip portion by the tapping operation is completed.

As is apparent from the above description, the length of the electronic pen body 3 in the axial direction in which the pen tip side moves during the tapping operation is smaller than the length of the stroke of the tapping cam mechanism portion in the axial direction in which the pen tip side of the electronic pen body 3 protrudes from the opening of the pen housing 2. That is, the pen tip side of the electronic pen main body portion 3 moves by the same amount as the press-in amount of the tapping rod 12 until the projecting portion 80 abuts against the step portion 2d of the pen housing 2, but does not move any further. When a pressure (load) is applied to the tapping rod 12 against the coil spring 62 of the elastic displacement portion 60 of the electronic pen body 3, the elastic displacement portion 60 of the electronic pen body 3 changes the length in the axial direction. The displacement amount of the length of the elastic displacement portion 60 of the electronic pen body 3 becomes a part of the stroke required for the tapping operation.

When the user applies a pen pressure by bringing the tip of the core 30 of the pen tip of the electronic pen 1 into contact with the input surface of the position detection sensor in the use state of fig. 5 (D), the elastic displacement portion 60 is insensitive to the pen pressure, and therefore the pen pressure applied to the tip of the core 30 is accurately detected by the pen pressure detection portion 71.

When an impact load is applied to the pen tip side, for example, by erroneously dropping the electronic pen 1 in a state where the pen tip of the electronic pen body 3 is pushed out from the opening of the pen housing 2, the impact load is absorbed by the elastic displacement of the elastic displacement portion 60, and damage to the electronic pen 1 can be avoided. That is, the elastic displacement portion 60 functions as a so-called impact absorber. The same applies when an impact load is applied to the tapping rod 12 side of the tapping cam mechanism 10.

Next, when the tapping rod 12 is pushed further from the use state in which the pen tip portion is pushed by the predetermined protruding length Lp in fig. 5 (D), the step portion 2D of the pen housing 2 is engaged with the protruding portion 80 of the electronic pen body 3, so that the protruding length of the pen tip side of the electronic pen body 3 is still the predetermined protruding length Lp, but as shown in fig. 5 (E), the elastic displacement portion 60 of the electronic pen body 3 is contracted in the axial direction, and accordingly, the rotating member 13 of the tapping cam mechanism 10 is rotated, and the locked state by the push is released, and the electronic pen body 3 is restored to the non-pushed state in which the pen tip side of the electronic pen body 3 is housed in the pen housing 2 as shown in fig. 5 (F) by the elastic displacement force of the return spring 5 (not shown in fig. 5) of the tapping cam mechanism 10.

As described above, in the electronic pen 1 of this embodiment, in the tapping operation of the electronic pen 1, the stepped portion 2d of the pen housing 2 and the projecting portion 80 of the electronic pen main body portion 3 are engaged, the pen tip side of the electronic pen main body portion 3 is maintained in a state of projecting by not more than the predetermined projecting length Lp, and the pressing and resetting operation of the tap cam mechanism portion 10 to the pen tip portion of the electronic pen main body portion 3 can be realized by the elastic displacement of the elastic displacement portion 60.

Therefore, even at the time of the tapping operation, the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2 at the pen tip side of the electronic pen body section 3, can be prevented from being brought into contact with the inner wall surface of the pen housing 2. Further, as described above, the displacement of the electronic pen body 3 in the direction orthogonal to the axial direction is also suppressed by the presence of the protruding portion 80 after being pushed out by the tap operation, and thus it is also possible to avoid the state where the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen case 2 at the pen tip side of the electronic pen body 3, is brought into contact with the inner wall surface of the pen case 2.

Other embodiments

The electronic pen of the above embodiment has a knock-type structure, but the electronic pen of the present invention is not limited to the knock-type structure. Fig. 6 is a diagram showing a configuration example of the electronic pen 1A having a non-knock type configuration.

In the electronic pen 1A of this embodiment, as shown in fig. 6, the electronic pen body 3 of the above-described embodiment is used as it is. The electronic pen body 3 is housed in a hollow portion 2Aa of a tubular pen case 2A made of, for example, resin, and the rear end side of the pen case 2A is closed with a cover 20A made of, for example, resin, so that the electronic pen body 3 is not movable in the axial direction.

In this case, the pen case 2A of the electronic pen 1A of this embodiment has, on one end side in the axial direction, an opening 2Ab for projecting the tip end portion 30a of the core 30 on the pen tip side of the electronic pen body 3 and a part of the ferrite core 42 around which the coil 41 is wound, to the outside, similarly to the pen tip side case portion 21 of the pen case 2 of the electronic pen 1 described above. As shown in fig. 6, the inner wall surface of the pen housing 2A is selected to have an inner diameter R4 on the pen tip side and an inner diameter R5 on the rear end side, so that a stepped portion 2Ad is formed at a position separated from the front end portion of the opening 2Ab on the pen tip side by a length L1 in the axial direction of the pen housing 2A.

Therefore, when the electronic pen body 3 is inserted into the hollow portion 2Aa from the opening on the rear end side of the pen housing 2A, the electronic pen body 3 is in a state in which the pen tip side is projected by the predetermined projection length Lp, and the projecting portion 80 abuts against the step portion 2Ad of the pen housing 2A, so that the electronic pen body is not moved further toward the pen tip side in the axial direction, as shown in fig. 6.

In this state, the lid 20A is coupled to the rear end side of the pen case 2A, and the rear end side opening is closed, so that the electronic pen main body 3 is housed in the hollow portion 2Aa of the pen case 2A in a state of not moving in the axial direction in the hollow portion 2Aa of the pen case 2A. In this case, the cover 20A includes an engagement recess 20Aa for engaging with the engagement protrusion 3P at the rear end of the electronic pen body 3.

In the electronic pen 1A of this embodiment, the cap 20A is coupled to the pen housing 2A in a state in which the elastic displacement portion 60 of the electronic pen body 3 is slightly contracted to elastically displace the length of the electronic pen body 3 in the axial direction. Thus, the cover 20A is coupled to the pen housing 2A in a state in which the protruding portion 80 of the electronic pen body 3 always elastically biases the stepped portion 2Ad of the inner wall surface of the pen housing 2A toward the pen tip.

Although not shown, the joint 23A between the pen case 2A and the cap 20A is a screw-fit by screwing. The joint 23A between the pen case 2A and the cap 20A may be not a screw joint by screwing, but may be the following structure: an annular convex portion is formed on one of the pen case 2A and the cap 20A, and an annular concave portion is formed on the other, and the other is press-fitted to one of the pen case 2A and the cap 20A, and the annular concave portion is fitted to the annular convex portion to be coupled thereto.

In the electronic pen 1A of this embodiment, the pen body 3 is engaged with the stepped portion 2Ad of the pen housing 2A by the projecting portion 80, and the pen tip side of the electronic pen body 3 is always maintained in a state of projecting by the predetermined projecting length Lp. Thus, in the electronic pen 1A of this embodiment, the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2A at the pen tip side of the electronic pen body 3, can be prevented from being brought into contact with the inner wall surface of the pen housing 2A.

In the electronic pen 1A of this embodiment, the diameter of the arcuate portion provided at the tip of the projecting portion 80 of the electronic pen body 3 in the projecting direction is substantially equal to or slightly smaller than the diameter R6 of the pen housing 2A, so that the electronic pen body 3 is also prevented from being displaced in the direction orthogonal to the axial direction. Therefore, the coil 41, which is an example of a member that is not intended to be brought into contact with the inner wall surface of the pen housing 2A at the pen tip side of the electronic pen main body section 3, can also be prevented from being brought into contact with the inner wall surface of the pen housing 2A.

In the use state of the electronic pen 1A of this example, as in the electronic pen 1 of the above-described embodiment, when the user applies a pen pressure by bringing the tip of the pen tip 30 into contact with the input surface of the position detection sensor, the elastic displacement portion 60 is insensitive to the pen pressure, so that the pen pressure applied to the tip of the core 30 is accurately detected by the pen pressure detection portion 71.

When an impact load is applied to the pen tip side by, for example, erroneously dropping the electronic pen 1A, the impact load is absorbed by the elastic displacement of the elastic displacement portion 60, and damage to the electronic pen 1A can be avoided.

In the electronic pen 1A of the embodiment of fig. 6, the electronic pen body 3 having the elastic displacement portion 60 is used as it is, but the electronic pen body 3 may have a structure without the elastic displacement portion 60. In this case, the cover 20A can be configured by using an elastic resin member such as hard rubber, for example, which has elasticity: the cover 20A is coupled to the pen housing 2A so as to always elastically urge the electronic pen body 3 toward the pen tip side in the hollow portion 2Aa of the pen housing 2A in a state where the protruding portion 80 of the electronic pen body 3 is engaged with the stepped portion 2Ad of the inner wall surface of the pen housing 2A.

Other embodiments or modifications

In the above-described embodiment, the stopper portion of the inner wall surface of the pen housing 2 for engaging with the protruding portion 80 to prevent the movement of the electronic pen body 3 to the pen tip side is a stepped portion 2d formed by changing the diameter of the hollow portion of the pen housing 2, but the stopper portion is not limited to such a stepped portion 2d, and any structure is possible as long as the stopper portion can engage with the protruding portion 80 to prevent the movement of the electronic pen body 3 to the pen tip side. For example, the stopper may be formed as a protrusion on the inner wall surface of the pen housing 2, which engages with all or a part of the extension 80 to prevent the electronic pen body 3 from moving to the pen tip side.

In the above-described embodiment, the protruding portion 80 provided in the electronic pen main body 3 protrudes in the direction orthogonal to the axial direction of the main body case 50, but the protruding portion is not limited to the orthogonal direction, and may be engaged with a stopper portion formed of the stepped portions 2d, 2Ad, or the like in the direction intersecting the axial direction. In consideration of this, when determining the formation position of the stopper portions such as the stepped portions 2d and 2Ad and the formation position of the protruding portion 80, the engagement position of the stopper portions such as the stepped portions 2d and 2Ad with the protruding portion 80 is selected based on the determination.

In the above-described embodiment, the elastic displacement portion 60 is provided on the rear end side of the main body portion case 50 of the electronic pen main body portion 3, but may be provided in the middle of the main body portion case 50. For example, the protective cover 52 of the main body case 50 may be divided into two parts, and provided in the middle of the divided protective cover 52.

In the above-described embodiment, the extension 80 is formed to extend from the outer periphery of the main body housing 50 from the angular range portions that are 180 degrees apart from each other, but the present invention is not limited to this, and may be formed to extend from the angular range portions that are 120 degrees apart from each other to three sides, or may be formed over the entire periphery of the main body housing 50. Further, 1 protruding portion may be formed over a predetermined angular range of the outer periphery of the main body portion case 50 of the electronic pen main body portion 3.

Fig. 7 shows an example in which the protruding portion is formed over the entire circumference of the main body portion case 50 of the electronic pen main body portion 3, and this example is an example in which the protruding portion is formed by modifying the shape of the holder portion 51 of the main body portion case 50.

Fig. 7 (a) is an enlarged view of the coupling side of the bracket portion 51A of the main body portion case 50A and the signal transmission member 40 constituted by the coil 41 wound around the ferrite core 42 in this example. Fig. 7 (B) is an enlarged perspective view of a portion of the signal transmission member 40 and the holder portion 51A of the main body housing 50A, which is formed of the coil 41 wound around the ferrite core 42.

In the example of fig. 7, the holder portion 51A of the main body portion case 50A has an outer diameter equal to the outer diameter R0 of the protection cap portion 52 at a joint position with the pen-tip-side end portion of the protection cap portion 52. The outer diameter of the holder portion 51A gradually increases from the outer diameter R0 at the joint position with the protective cover portion 52 toward the pen tip side, and the holder portion 51A has an extension-shaped portion 80A having a maximum outer diameter of R6 substantially equal to or slightly smaller than the inner diameter R5 of the hollow portion of the pen housing 2. The protruding shape portion 80A constitutes a protruding portion. In the example of fig. 7, a distal end portion 51Aa having an outer diameter equal to the outer diameter R0 of the protection cover portion 52 is formed further toward the pen point side than the projecting shape portion 80A.

In this example, therefore, as shown in fig. 7 (a) and (B), a step is formed at the boundary between the tip end portion of the protruding portion 80A and the tip end portion 51Aa, and the end face 80Aa of the protruding portion 80A constituting the step engages with the step 2d of the pen case 2. The holder portion 51A may be formed so as to have only the projecting shape portion 80A without providing the distal end portion 51Aa, and the end face 80Aa of the projecting shape portion 80A may be configured to engage with the step portion 2d, which is an example of a stopper portion of the inner wall surface of the pen case 2.

In this embodiment, as shown in fig. 7 (a) and (B), concave portions 80Ab are provided at predetermined angular positions in the circumferential direction in the protruding shape portion 80A of the holder portion 51A. On the other hand, in this example, a projection that engages with the recess 80Ab is formed at a predetermined angular position in the circumferential direction of the inner wall surface in the vicinity of the stepped portion 2d of the pen case 2, and the projection of the pen case 2 engages with the recess 80Ab, so that the electronic pen body 3A does not rotate about the axial direction. That is, the concave portion 80Ab serves to prevent rotation of the electronic pen main body portion 3A.

In this example, as shown in fig. 7 (B), a groove 80Ac is formed in the outer peripheral surface of the protruding shape portion 80A of the holder portion 51A at a predetermined angular position in the circumferential direction along the axial direction. In this example, as shown in fig. 7 (B), the lead portions 41a and 41B at both ends of the coil 41 are housed in the recess 80Ac, and guided into the protective cover 52. The circuit board held by the holder 51A is present in the protective cover 52, and the lead portions 41A and 41b of the coil 41 are connected to a capacitor disposed on the circuit board, thereby forming a resonant circuit.

The above-described embodiment has been described with respect to the case of an electromagnetic induction type electronic pen, but is not limited to the electromagnetic induction type, and can be similarly applied to the case of a capacitance type electronic pen such as an active capacitance type electronic pen.

Description of the reference numerals

1. 1A … electronic pen, 2A … pen housing, 2a, 2Aa … hollow portion, 2b, 2Ab … opening, 2d, 2Ad … step portion, 3 … electronic pen body portion, 5 … return spring, 10 … tap cam mechanism portion, 12 … tap stick, 40 … signal transmission member, 50 … body portion housing, 60 … elastic displacement portion, 71 … pen pressure detection portion, 72 … circuit substrate, 80 … extension portion.

Claims

1. An electronic pen, comprising:

2. The electronic pen of claim 1, wherein the pen comprises a pen body,

the protruding portion is arranged on the outer peripheral portion of the main body portion housing in the following manner: the length in the axial direction of the main body housing from the tip end position of the core body attached to the main body housing to the portion of the protruding portion engaged with the stopper is set to be equal to the length in the axial direction of the main body housing, which is determined by adding the length of the tip end position of the pen housing to the stopper to the length of the main body housing in the axial direction of the main body housing, which is to be exposed to the outside from the opening of the pen housing in use of the electronic pen.

3. The electronic pen of claim 1, wherein the pen comprises a pen body,

the electronic pen body is elastically biased toward the pen tip side in the pen housing in a state where the core body attached to the electronic pen body is exposed to the outside from the opening of the pen housing and the protruding portion of the body housing is engaged with the stopper portion.

4. The electronic pen of claim 1, wherein the pen comprises a pen body,

The electronic pen body includes an elastic displacement portion that, when a load in an axial direction of the body housing is applied, elastically contracts and displaces a length of the electronic pen body in the axial direction according to the applied load.

5. The electronic pen of claim 4, wherein the pen comprises a pen body,

the electronic pen body part is provided with a pen pressure detection part in the body part shell for detecting the pen pressure applied to the core body,

the elastic displacement portion is insensitive to the load of the range of the pen pressure values detected by the pen pressure detection portion, and performs the elastic displacement so as to absorb a load larger than the load of the range of the pen pressure values.

6. The electronic pen of claim 4, wherein the pen comprises a pen body,

the elastic displacement portion is provided on a side opposite to a side on which the core is mounted with respect to the main body portion housing in an axial direction of the main body portion housing.

7. The electronic pen of claim 4, wherein the pen comprises a pen body,

the electronic pen body is elastically biased toward the pen tip side in the pen housing by the elastic displacement portion in a state where the core body attached to the electronic pen body is exposed to the outside from the opening of the pen housing and the protruding portion of the body housing is engaged with the stopper portion.

8. The electronic pen of claim 4, wherein the pen comprises a pen body,

a knock cam mechanism is provided at the other end side of the pen housing in the axial direction, and holds the other end side of the main body housing in the axial direction, so that the core of the main body housing attached to the electronic pen main body is moved out and into the opening of the pen housing at the pen tip side by a knock operation of a user.

9. The electronic pen of claim 8, wherein the pen is further configured to,

the structure is as follows: when the tapping operation is performed, the elastic displacement portion performs the elastic displacement in a state where the protruding portion of the body portion case of the electronic pen body portion is engaged with the stopper portion of the inner wall surface of the pen case.

10. The electronic pen of claim 1, wherein the pen comprises a pen body,

the protruding portion is configured to: the center line position of the body portion case is maintained at the same position as the center line position of the hollow portion of the pen case by abutting the protruding end surface of the body portion case in a direction intersecting the axial direction of the body portion case against the inner wall surface of the hollow portion of the pen case.

11. The electronic pen of claim 1, wherein the pen comprises a pen body,

a coil wound around a magnetic core is provided on a pen tip side of the electronic pen body, and a position of the projecting portion of the electronic pen body in the axial direction of the body housing and a position of the stopper portion of the inner wall surface of the pen housing in the axial direction of the pen housing are determined so that an end of the coil on the pen tip side does not contact the inner wall surface of the pen housing when the core projects from the opening of the pen housing.

12. The electronic pen of claim 1, wherein the pen comprises a pen body,

the stopper is formed in a stepped portion formed on an inner wall surface of the pen housing.

13. An electronic pen body having a tubular body housing which can be accommodated in a hollow portion of a tubular pen housing having an opening at a pen tip side, a core being attached to one end side of the body housing in an axial direction, the other end side of the body housing in the axial direction being locked in the pen housing, the electronic pen body being characterized in that,

an extension portion protruding in a direction intersecting the axial direction is formed at a predetermined position in the axial direction of the outer peripheral portion of the main body case,

The electronic pen main body part is formed as follows: the protruding portion of the main body portion case is engaged with a stopper portion provided on an inner wall surface of the hollow portion of the pen case in a state where a tip end side of the core is exposed to the outside from the opening of the pen case, and movement of the electronic pen main body portion toward the pen tip in the axial direction is prevented.

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

the protruding portion is arranged on the outer peripheral portion of the main body portion housing in the following manner: the length in the axial direction of the main body housing from the tip end position of the core body attached to the main body housing to the portion of the protruding portion engaged with the stopper is set to be equal to the length in the axial direction of the main body housing set to the length in the axial direction of the main body housing from the tip end position of the pen tip side of the pen housing to the stopper, added to the length in the axial direction of the main body housing set to the length of the pen tip side of the electronic pen main body to which the core body is attached, the length being the length that the pen tip side of the electronic pen main body should protrude from the opening of the pen housing at the time of use of the electronic pen.

15. The electronic pen body according to claim 13, wherein,

The electronic pen is provided with an elastic displacement portion which, when a load in the axial direction of the main body housing is applied, elastically contracts and displaces the length of the electronic pen main body in the axial direction according to the applied load.

16. The electronic pen body according to claim 15, wherein,

a pen pressure detecting part for detecting the pen pressure applied to the core body is arranged in the main body part shell,

17. The electronic pen body according to claim 15, wherein,