JP2019214216A - Writing instrument - Google Patents

Abstract

To provide a writing instrument that allows a user to visually recognize a writing direction widely at a viewing portion of a pen tip and can reliably write until the end of writing.SOLUTION: A writing instrument is characterized in that: a pen tip includes a porous body serving as a writing portion, and a holding body that holds the porous body and has at least one ink guiding portion for supplying ink to the writing portion; the ink contained in a writing instrument body is supplied to the writing portion through the ink guiding portion of the holding body, and the holding body serves as a viewing portion in which a writing direction can be viewed; a flange is integrally formed on an outer periphery of the ink guiding portion of the holding body with the same material as the holding body; the ink guiding portion is formed in a longitudinal direction of the holding body; an area ratio of the viewing portion is 40% or more of the pen tip protruding from a tip of the writing instrument body; the ink is directly supplied to the ink guiding portion; and the total cross-sectional area of the ink guiding portion inside the holding body is 0.01 to 7 mm.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument of a type called an underline marker or the like that supplies ink in the writing instrument main body to a writing section of a pen tip, and more specifically, a writing direction can be visually recognized widely by a viewing section of the pen tip, The present invention relates to a writing instrument that can reliably write until the end.

  DESCRIPTION OF RELATED ART Conventionally, the writing implement of each structure (for example, refer patent document 1-5 by this applicant) is known as a writing implement which can visually recognize the writing direction in the visual recognition part of a pen tip. In each of these patent documents, as an example of a proximity technique of the present invention, as shown in FIG. 9, a writing implement 1 having a pen body 1b capable of guiding and retaining ink supplied from a writing implement main body 1a. In the above, the pen body 1b includes an ink guiding portion 1c and a writing portion 1d for leading out ink from the ink guiding portion 1c, and a visible portion 1e in which the writing direction can be visually recognized directly above the writing portion 1d in the axial direction. A writing instrument (for example, refer to Patent Document 1 by the present applicant) is known, and each pen body shown in FIGS. 10 and 11 discloses a proximity technology closest to the present invention. Is what you do.

FIGS. 10A and 10B are drawings of a sixth embodiment of a pen body in a writing instrument described in Patent Document 1. FIG. The pen body 2 of this embodiment is provided with a writing portion 2c fixed at a front end of a transparent support member 2a with a leg portion 2b, and communicates with a rear end of the leg portion 2b of the writing portion 2c to connect the inside of the support member 2a. The ink guiding portion 2d is formed in a required portion by an ink guiding groove for guiding the ink by capillary action. Since the supporting member 2a is made of a transparent resin or the like, 2e is a visible portion. Thus, the writing direction is visually recognized through the flowing ink in the visible portion 2a.
FIGS. 11A and 11B show an eighth embodiment of the pen body of the pen body in the writing instrument described in Patent Document 1. The pen body 3 of this embodiment has substantially the same configuration as that of the pen body of the sixth embodiment shown in FIG. 10 described above. The guide groove 3c is formed so as to bypass the window 3b, so that ink can be supplied to the writing portion 3d by capillary action.

However, in the writing implement described in Patent Document 1, in FIGS. 9 and 11, ink guides 1c and 3c are provided on both sides of the visible parts 1e and 3b, and writing parts 1d and 3d are provided below. Therefore, the area ratio of the visible portion 1e having visibility is actually in the order of 30% of the pen point (pen body) protruding from the tip end of the writing instrument main body, so that sufficient visibility can be secured. However, there is a problem in that the writing direction is slightly difficult to see. If the visible part is enlarged, the visibility in the writing direction is widened, but the writing part is also enlarged, which impairs the writing performance as a line marker.
Further, in the pen body 2 shown in FIG. 10, the writing direction is visually recognized through the ink flowing in the visible portion 2a. Therefore, when the ink color is dark, the writing direction is difficult to see. Further, since the leg 2b portion fixed in the visible portion 2a has no visibility, the area ratio of the visible portion 2a having visibility is actually a pen point (pen body) protruding from the tip of the writing instrument body. Therefore, a pen having a structure in which sufficient visibility cannot be ensured and the writing direction can be visually recognized in a wider range is desired at present.

On the other hand, as a writing instrument of an ink end detection type that can visually recognize a portion in the writing direction behind the writing section and can detect the end sign of the ink, for example, as shown in FIGS. As shown, the ink impregnated in the ink occlusion body 4b in the barrel 4a is supplied to the pen tip 4e serving as a writing part via the relay core 4c and the ink guiding part 4d, and the ink occlusion body 4b An ink end detection type writing instrument that detects the end sign of ink by visually recognizing the ink guide section 4d, wherein the ink guide section 4d includes a visible portion 4f capable of visually recognizing a writing direction, and a side of the visible portion 4f. A writing implement 4 (for example, see Patent Document 6 by the present applicant) having an ink guide tube 4g in its portion, and an ink occluding body 5b in a barrel 5a as shown in FIGS. 13 (a) and 13 (b). Was done The ink is supplied to the pen tip 5e serving as a writing portion via the relay core 5c and the ink guide tube 5d, and is detected by visually recognizing the ink end sign of the ink occluding body 5b with the ink guide tube 5d. An ink end detection type writing instrument, wherein the ink guide tube 5d has a flat ink guide portion 5g provided with a slit-shaped ink flow path 5e having a thickness of 0.01 to 1.0 mm inside. A writing instrument 5 (for example, the visible light transmittance of the ink guide portion 5g at the time of ink filling becomes 50% or more, and the writing direction directly below the ink guide portion 5g in the axial direction of the ink guide portion 5g can be visually recognized via the ink guide portion 5g. And Patent Document 7 by the present applicant) are known.

However, in the writing implement 4 shown in FIGS. 12A and 12B, in order to reliably detect the end sign, the ink guide tube 4g becomes thick (large), so that sufficient visibility must be ensured. There is some problem in that it cannot be done. In addition, since the shape of the ink guide tube 4g is complicated, it is difficult and difficult to ensure the sealing performance of the pen tip and to use a structure in which the ink can be used up to the end.
Further, in the writing implement 5 shown in FIGS. 13A and 13B, if the ink guiding portion is made thin enough to ensure sufficient visibility, the ink flow rate cannot be ensured, and If an attempt is made to secure the ink flow rate, it is not possible to secure sufficient visibility, and therefore, there are few effective visible portions and it is difficult to see.

Japanese Patent Application Laid-Open No. 2000-52682 (Claims, embodiments, FIG. 1, FIG. 11, FIG. 12, etc.) JP 2001-253193 A (claims, embodiments, FIG. 1, etc.) JP-A-2002-19370 (claims, embodiments, FIG. 1, etc.) JP 2005-246606 A (Claims, embodiments, FIG. 1, etc.) Japanese Patent Application Laid-Open No. 2006-256045 (Claims, embodiments, FIG. 1, etc.) Japanese Patent Application Laid-Open No. 2007-69426 (Claims, Embodiments, FIG. 1, etc.) Japanese Patent Application Laid-Open No. 2007-69427 (Claims, Embodiments, FIG. 1, etc.)

  The present invention has been made in view of the above-described problems of the related art, and has been made to solve the problem. In a writing instrument having a viewing portion and an ink guiding portion, a sufficient visual recognition that can reliably read characters written in the writing direction is provided. The purpose of the present invention is to provide a writing implement that can be used until the end of the writing, and that can provide sufficient writing flow to the end of the writing pen without losing visibility, and is easy to write and durable. The purpose is to provide.

The present inventors have conducted intensive studies in order to solve the above-described conventional problems and the like.As a result, the pen tip has a porous body serving as a writing unit, and a pen for holding the porous body and supplying ink to the writing unit. And a holder having an ink guiding portion, wherein the ink contained in the writing instrument main body is supplied to the writing portion through the ink guiding portion of the holding member, and the holding member is capable of visually recognizing a writing direction. In the writing implement, the area ratio of the visual recognition portion is determined to be a pen point structure having a specific value or more, and also the structure of the ink guide portion, and the boundary surface structure between the porous body and the holding body serving as the writing portion are specified. The inventors have found that a writing instrument with the above object can be obtained by adopting the structure, and have completed the present invention.

That is, the present invention resides in the following (1) to (3).
(1) The pen tip includes a porous body serving as a writing section, and a holding body that holds the porous body and has at least one ink guide section for supplying ink to the writing section, and is included in the writing implement body. Ink is supplied to the writing section through the ink guide section of the holding body, and the holding body is a writing instrument serving as a visual recognition section in which the writing direction can be viewed. The flange is integrally formed of the same material as the holding member, the ink guide portion is formed in the longitudinal direction of the holding member, and the area ratio of the visual recognition portion is such that the area ratio of the pen tip protrudes from the tip of the writing implement body. 40% or more, and the ink is supplied directly to the ink guide portion, and the total cross-sectional area of the ink guide portion inside the holding member is 0.01 to 7 mm ² . (2) The writing instrument according to the above (1), wherein the writing section is inclined with respect to a major axis direction of the main body axis.
(3) The resin constituting the holding body enters from the holding body into the unevenness of the porous body pores at the portion where the writing body and the holding body are in contact with each other, and the holding body resin layer is formed. The writing instrument according to the above (1) or (2), wherein the body and the holding body are fixed.

ADVANTAGE OF THE INVENTION According to this invention, while sufficient visibility which can read the character written in the writing direction more reliably than before is provided, and ink is directly supplied to an ink guide part, without impairing visibility. Since the writing instrument is efficiently supplied to the writing section, a writing implement which can use a sufficient writing flow rate until the end of the writing operation is provided.
According to the invention of claims 2 and 3, further, without impairing visibility, a sufficient writing flow rate can be ensured until the end of writing, easy to write, and a holding body having a porous body serving as a writing part and an ink guide part. There is provided a writing instrument capable of firmly fixing a writing instrument.

It is a longitudinal section of a writing implement which shows an example of an embodiment of the present invention. (A) is a longitudinal sectional view showing an example of a pen tip used in the writing instrument of the present invention, (b) is a sectional view taken along line AA of (a), and (c) is a sectional view taken along line BB of (a). is there. (A) is a front view showing a state in which a relay porous body, a porous body serving as a writing section, a holder having an ink guide section, and the like are set, (b) is a longitudinal sectional view of (a), (c) and (D) is the top view and perspective view of a holding body. (A) is a plan view of a state in which a porous body serving as a writing unit and a holder having an ink guide are set, (b) is a side view thereof, and (c) and (d) are a porous body and a holder. FIGS. 4A and 4B are a front view and a side view showing a holder resin layer at a boundary surface of FIG. (A) is an enlarged longitudinal sectional view showing an example of a state in which a holding body having an ink guide portion and a relay porous body are set, and (b) is a longitudinal sectional view showing another example of (a). (A)-(d) is a front view which shows each shape of the ink guide part of a pen tip other than linear shape with respect to a long axis direction. FIGS. 7A and 7B are continuations of FIG. 6 and are front views showing the shape of the ink guide portion of the pen tip other than the linear shape in the long axis direction. It is a front view which shows each dimension of the pen tip used for the writing implement of the Example of this invention, and a comparative example. It is a longitudinal section of a writing implement which shows an example of the conventional writing implement. (A) and (b) are a front view and a cross-sectional view showing an example of a pen tip in the conventional writing instrument of FIG. 7A and 7B are a front view and a cross-sectional view showing another example of the pen tip in the conventional writing instrument of FIG. (A) and (b) are a longitudinal sectional view of a writing implement showing an example of a conventional writing implement, and a cross-sectional view showing an example of a pen tip in the writing implement. (A) and (b) are a longitudinal sectional view of a writing implement showing an example of a conventional writing implement, and a cross-sectional view showing an example of a pen tip in the writing implement.

Hereinafter, embodiments of the present invention will be described in detail.
1 is a longitudinal sectional view showing an example of an embodiment of a writing instrument of the present invention, FIG. 2 is a drawing showing a pen tip, (a) is a longitudinal sectional view, and (b) is a line AA of (a). FIG. 3C is a cross-sectional view taken along line BB of FIG.
The writing implement A of the present embodiment is a marking pen type writing implement, and as shown in FIG. 1, includes a shaft cylinder 10 serving as a writing implement main body, an ink occlusion body 20, a relay porous body 30, a pen tip 40, and a tail plug 60. Have.
The barrel 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and fixes the pen tip 40 to the main body 11 that houses the ink occluding body 20 impregnated with writing implement ink. It has a front shaft portion 12.

The ink occluding body 20 is impregnated with a writing implement ink such as an aqueous ink or an oil-based ink, and includes, for example, natural fiber, animal hair fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin. Fiber bundles made of one or a combination of two or more of resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., processed fiber bundles such as felts, and sponges , Resin particles, and porous bodies such as sintered bodies. The ink occluding body 20 is housed in the main body 11 of the barrel 10.
The rear end opening of the barrel 10 is sealed with a tail plug 60 formed of the same material as the barrel 10 or another synthetic resin material.
The ink composition to be used is not particularly limited. In an underline pen or the like, a fluorescent dye, for example, Basic Violet 11, Basic Yellow 40, or the like can be contained in the ink.

  The relay porous body 30 serves as a relay core for supplying the ink of the ink occlusion body 20 to an ink guide section 50 provided on a holding body 55 described later, and like the ink occlusion body 20, a fiber bundle, a fiber or the like. It is a fiber bundle core obtained by processing a bundle, or has a continuous pore (flow path) such as a resin sponge, a resin particle porous body made of a resin particle sintered body, or a sliver core, and is impregnated in the ink occlusion body 20. The shape, structure, and the like are not particularly limited as long as the ink can be supplied to the ink guide portion 50 of the holding body 55 via the relay porous body 30. Examples of the cross-sectional shape of the relay porous body include, for example, a circle, an ellipse, a square, a rectangle, a trapezoid, a parallelogram, a rhombus, a kamaboko shape, and a half-moon shape.In the present embodiment, the cross-sectional shape is a circular shape. Has become. In addition, as shown in FIG. 1, the relay porous body 30 of the present embodiment is structured to be held by a support member 35 fitted into the front shaft 12.

As shown in FIGS. 1 and 2, the pen tip 40 includes a porous body (pen core) 45 serving as a writing unit and an ink guide unit 50 for holding the porous body 45 and supplying ink to the writing unit. And a holding body 55 having the same.
The porous body 45 serving as a writing portion of the present embodiment is fixed to the tip of the holder 55, and is, for example, a natural fiber, an animal hair fiber, a polyacetal resin, a polyethylene resin, an acrylic resin, or a polyester resin. Fibers such as parallel fiber bundles and felts made of one or a combination of two or more of resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, and polyphenylene resins. It is made of a fiber core obtained by processing a bundle or processing these fiber bundles with a resin, or a porous body (sintered core) obtained by sintering various kinds of plastic powder and the like.

Examples of the shape of the porous body 45 serving as a writing portion include an external shape such as a chisel shape, a shell shape, a cylinder, an elliptic cylinder, a cube, and a rectangular parallelepiped, and the cross-sectional shape thereof is trapezoidal, parallelogram, or the like. , A rhombus, a kamaboko shape, a half-moon shape, and the like. In the present embodiment, the shape is a chisel shape. The chisel shape is a shape in which the tip forms an inclined surface with respect to the center line of the pen shaft, and the inclined surface is flat.
In addition, the porous body 45 serving as a writing portion is preferably inclined at an angle of 40 to 90 ° with respect to the major axis direction of the main body axis so as to have an inclination that facilitates writing. In this case, the inclination is 75 °.
The shape, inclination, and the like of the porous body 45 serving as the writing portion are appropriately set in accordance with the convenience of writing or the like. The porous body 45 serving as a writing part has a large drawing line width, and is preferably a writing part having a drawing line width of 2 mm or more, more preferably a drawing line width of 3 mm or more.

The holder 55 of the present embodiment is made of a material having visibility, for example, PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic , Polymethylpentene, polystyrene, ABS and the like, and is preferably made of a material having a visible light transmittance of 50% or more.
If a material having a visible light transmittance of less than 50% is used, characters written in the writing direction cannot be effectively visually recognized, which is not preferable. In order to achieve a further excellent visual recognition function, a material that transmits 50% or more is preferable. If the visible light transmittance is 80% or more, the material can be more visually recognized.
The visible light transmittance can be determined by measuring the reflectance using a multiple light source colorimeter.

  The holder 55 can be made of one or more of the above materials, or two or more of them from the viewpoint of further improving durability and visibility. In this case, it is preferable that at least one of them is made of a material having a visible light transmittance of 50% or more, and can be molded by various molding methods such as injection molding and blow molding.

The holding member 55 has at least one ink guiding section 50 for supplying ink to the writing section. In the present embodiment, the area ratio of the viewing section is maximized. As shown in FIGS. 2A and 2C, one ink guide 50 is provided at the center in the longitudinal direction so as to penetrate the porous body efficiently.
The shape, size, and the like of the ink guide portion 50 are not limited as long as the ink impregnated in the ink occluding body 20 included in the writing instrument main body has a structure or the like that can be directly supplied to the ink guide portion via the relay porous body 30. The shape, structure, size, number and the like can be appropriately selected.
Preferably, in order to maximize the effects of the present invention, the length W in the cross-sectional width of the ink guiding portion 50 is less than 40% of the major axis length X of the pen tip, and more preferably 1 to 30. %, And the cross-sectional area of the ink guide portion 50 is preferably smaller than the cross-sectional area of the writing portion on the holder side or smaller than the cross-sectional area of the relay porous body 30 on the holder side.

In particular, from the viewpoint of ensuring a sufficient writing flow rate and ensuring a sufficient writing flow rate without impairing the visibility of the holder, the length of the ink guide section 50 in the width direction is 3 mm or less, preferably 0.1 to The diameter is desirably 2.5 mm, and the diameter is 0.1 to 3.0 mm, preferably 0.2 to 3.0 mm.
It is desirably a tube having a diameter of 2.5 mm, more preferably a diameter of 0.2 to 2.0 mm.
Further, it is desirable that the total cross-sectional area of the ink guide portion 50 in the holder 55 is 0.01 to 7 mm ² , preferably 0.03 to ⁵ mm ² , and more preferably 0.03 to ⁴ mm ^2. .
Further, it is preferable that the ink guiding section 50 is tapered toward the writing section 45, and two or more ink guiding sections 50 are arranged at 0 to 30 ° with respect to the major axis direction of the main body axis. However, it is desirable that only one is provided.
The shape of the ink guiding portion 50 is desirably a straight line with respect to the long axis direction. However, as described later, a V shape, an X shape, a Y shape, a spiral shape, an inverted V shape, and an inverted Y shape are provided. In this way, the shape can be made easily visible.
In this embodiment, the flange 51 is integrally formed of the same material as the holding body on the side of the relay porous body 30 of the holding body 55 from the viewpoint of securing the protection and the sealing performance of the writing portion porous body, and the ink guiding section 50. At the rear end, an opening 52 larger than the ink guide 50 is formed concentrically.

  As a method of forming the ink guide portion 50 having the above-described structure, for example, a resin is poured into a mold having a rod-shaped body or the like for forming the ink guide portion, and injection molding is performed. A method of forming the ink guide portion 50 on the holder 55 by cutting the mold, a method of forming the ink guide portion 50 by drilling, laser processing or the like after the formation of the holder 55, and a method of forming the holder 55 into two members, each having an ink After forming the grooves for forming the guiding portion, a method of forming the ink guiding portion 50 on the holding member 55 by integrating these by bonding, welding, or the like, may be used, for example, by a method similar to that described in the prior art document. can do.

In the present invention, preferably, the ink guide section 50 provided inside the holding body 55 has a visible light transmittance of less than 50% in a state where the ink for a writing instrument described later is contained, and does not function as a visual recognition section. It is desirable that the writing direction cannot be visually recognized effectively. If the ink guide portion 50 is in a state where the ink can be visually recognized in a state where the ink is contained, the use of the coloring components of the ink is limited, and an ink color corresponding to the needs cannot be obtained, which is not preferable. In such a case, a pipe colored with substantially the same color as the ink for the writing implement may be inserted into the ink guide section 50 so that the ink color can be easily determined.
In addition, a portion other than the ink guide portion 50 of the holding member 55 is a surface that forms a visible portion, and is preferably a substantially parallel surface in order to effectively recognize the writing direction. It should be noted that the viewing portion can be enlarged and viewed as a lens surface.

In the present invention, the adhesion between the porous body 45 serving as the writing section and the holding body 55 having the ink guide section 50 is performed because the porous body 45 is firmly fixed in a state where sealing performance is imparted. The resin forming the holder from the holder 55 enters the unevenness of the pores of the porous body 45 at the portion where the holder 45 and the holder 55 are in contact with each other, thereby forming a holder resin layer. Preferably, 55 is fixed.
The material forming the porous body 45 and the holding body 55 is preferably selected from resins having different solubility in a solvent. For example, the porous body 45 may be made of a polyethylene sintered core, and the holding body may be made of acrylic. For example, as a solvent, the difference between the solubility parameter (SP value) of the porous resin and the support resin can be 0.5 or more, so that alcohol, ester (butyl acetate), ether, ketone (acetone), glycol ether By using an organic solvent such as an alicyclic hydrocarbon, an aliphatic hydrocarbon, a chlorinated aliphatic hydrocarbon (dichloromethane), an aromatic hydrocarbon, or a chlorinated aromatic hydrocarbon, The holding body 55 having the ink guiding portion 50 can be fixed.

Preferably, an end surface of the ink guiding portion 50 on the writing portion porous body 45 side is provided on a boundary surface between the porous body 45 and the holding member 55 by a holding resin layer (hereinafter referred to as a “bonding surface of the holding resin layer on the boundary surface”). Is formed, and the bonding surface has a length of 0.5 mm or more, more preferably 0 mm, in all directions of the end surface.
. It is desirable that the thickness be 8 to 3 mm.
The adhesive surface can be formed of any one of a flat surface, a curved surface, and a bent portion. The adhesive surface is formed on the end surface of the ink guide portion 50 on the writing portion porous body 45 side at least 0.5 mm over the entire circumference of the end surface. It is more preferable that the thickness is 0.8 to 3 mm.
Further, it is desirable that the holding body resin layer on the bonding surface is formed to 1 to 1000 μm, more preferably 10 to 800 μm toward the inside of the porous body 45, and the holding body in contact with the writing portion porous body 45. It is desirable that the surface of the local peak at the contact portion 55 is in a matte state by graining or the like.

FIGS. 3 and 4 show an embodiment of an adhesive structure of a porous body 45 serving as a writing portion and a holding member 55 having an ink guiding portion 50.
FIGS. 3A and 3B are front views showing a state where the relay porous body 30, the support member 35, the porous body 45 serving as a writing part, and the holding body 55 having the ink guiding part 50 are set, and a longitudinal section. FIGS. 4C and 4D are a plan view and a perspective view of the holder 55, and FIG. 4A is a holder 55 having a porous body 45 serving as a writing unit and an ink guide unit 50. (B) is a side view thereof, (c) and (d) are a front view and a side view showing the holding body resin layer 46 at the boundary surface between the porous body 45 and the holding body 55. .

In this embodiment, as shown in FIG. 3D, a rib body is provided above the holding body 55 in order to firmly fix the porous body 45 serving as a writing portion and the holding body 55 having the ink guiding section 50. 56 are provided on two or more side surfaces of the writing portion porous body 45, and two are provided in this embodiment.
Further, as shown in FIG. 3D, the bonding surface between the porous body 45 serving as the writing portion and the holding member 55 having the ink guiding portion 50 is formed by two inner surfaces of the side surfaces of the rib body 56 and the ink guiding portion. The bottom surface excluding the opening 50 is an adhesive surface, is a flat surface, and the surface of the local top of the contact portion of the holder 55 that contacts the writing portion porous body 45 is subjected to graining or the like. It is in a satin state.
In this embodiment, the porous body 45 and the holder 55 can be fixed by two-color molding or the like.

  In the present embodiment configured as described above, the bonding between the porous body 45 serving as the writing portion and the holding body 55 having the ink guiding section 50 is performed by bonding the porous body 45 with the holding body 55 where the porous body 45 is in contact. The resin forming the holding body from the holding body 55 enters the unevenness of the pores of the body 45, and the holding body resin layer 46 is formed on the bottom surface. Thus, a writing instrument having excellent durability can be obtained, which can be reliably fixed to the holding member 55 having a sufficient writing flow rate until the end of writing.

Further, in the present invention, the bonding between the relay porous body 30 and the holding body 55 can be performed by forming a holding body resin layer in the same manner as in the above-described embodiment.
Specifically, as shown in FIG. 5A, the bonding surface of the relay porous body 30 is formed on any one of a flat surface, a curved surface, and a bent portion, and the end surface of the ink guiding portion 50 on the relay porous body 30 side is formed. A resin resin layer (hereinafter, referred to as an “adhesive surface on the relay porous body side”) is provided on the boundary surface between the retainer 55 and the relay porous body 30 inserted into the support member 35 of the holder 55 over the entire circumference of the relay porous body 30. The cross-section thickness is 0.5 mm or more, and the circumferential retainer resin layer 31 on the adhesive surface on the relay porous body 30 side is 1 to 1000 μm toward the inside of the porous body, and the retainer 55 that comes into contact with the relay porous body 30. The surface of the local peak at the contacting part is made matte by graining or the like.

In the present embodiment configured as described above, the bonding between the relay porous body 30 and the holder 55 having the ink guiding portion 50 is performed by bonding the relay porous body 30 to the portion where the relay porous body 30 is in contact with the holder 55. The resin forming the holding body from the holding body 55 enters the unevenness of the fine pores, and the holding body resin layer 31 is formed to fix the relay porous body 30 and the holding body 55 having the ink guide portion 50. As a result, a sufficient writing flow rate can be supplied to the ink guide unit 50, and the durability is excellent. Further, as shown in FIG. 5B, the holding body resin layer 31 may be formed on the entire portion where the relay porous body 30 is press-fitted and the support member 35 and the relay porous body 30 are in contact with each other. .

In the writing instrument of the present invention, as described above, the pen tip 40 has the porous body 45 serving as a writing unit, and at least one ink guiding unit 50 for holding the porous body 45 and supplying ink to the writing unit. This is provided with the holding body 55, and has the relay porous body 30 for supplying the ink contained in the writing instrument main body 10 to the ink guide portion 50 provided on the holding body 55, and the holding body 55 has visibility. Therefore, the entire surface (entire) of the holding member 55 other than the ink guide portion 50 becomes a visible portion in which the writing direction can be visually recognized. Area ratio of the pen tip protruding from the tip of the writing implement body 10 can be 40% or more, preferably, the visible portion of the pen tip holder 55 on the side surface is also 40% or more. By forming the center portion 50 of the holding member 55 in the longitudinal direction and setting the length, diameter, cross-sectional area, and the like of the ink guide portion 50 in the width direction in the above-described preferable ranges, the area ratio of the visual recognition portion is further improved. The writing implement can be provided with sufficient visibility that can reliably read characters written in the writing direction more than before, and a writing implement that can be used until the end is provided. You. In particular, since the ink guiding portion 50 is formed at the central portion in the longitudinal direction of the holding member 55, the ink can be efficiently supplied to the porous body 45 serving as the writing portion without any force. Writing implements will be provided.
Further, by forming the ink guide portion 50 at the central portion in the longitudinal direction of the holder 55, the writing direction can be easily determined, and the shape becomes very easy to write.
Further, by providing the rib body 56 on the upper part of the holder 55, when writing with a ruler, a straight line can be drawn without soiling the ruler.
Furthermore, by using a mechanism in which the liquid is directly supplied to the ink guide section 50, the ink can be efficiently supplied to the porous body 45 serving as a writing section. When a porous body is used as the ink guide section 50, a suitable ink flow rate may not be obtained.

The writing implement of the present invention is not limited to the above-described embodiment and the like, and can be variously changed without changing the gist of the present invention.
For example, in the above embodiment, the shape of the ink guide portion 50 formed linearly with respect to the long axis direction has been described in detail, but the shape of the ink guide portion 50 of the pen tip 40 is shown in FIGS. Each of the shapes shown in FIG. 7 (d) and FIGS. 7 (a) and 7 (b) can be made easily visible. 6 and 7, the same components as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.
FIG. 6A shows the shape of the ink guiding section 50 in a V-shape, FIG. 6B shows an X-shape, FIG. 6C shows a Y-shape, and FIG. The spiral shape, FIG. 7A shows an inverted V-shape, and FIG. 7B shows an inverted X-shape.
In the above embodiment, two rib bodies 56 are provided, but three rib bodies 56 may be provided. Further, it can be provided on the entire circumference (four directions) of the porous body.

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.
[Test Example 1: Examples 1 to 4 and Comparative Examples 1 to 6]
A writing implement and an ink having a pen tip having the following configuration were used. The dimensions of the porous body serving as a writing portion, the holder, and the ink guide portion, etc., constituting each pen tip were as shown in Table 1 below and FIG. 8. A common writing implement member and ink other than the pen tip were used.

(Configuration of pen tip)
Writing part porous body: PE sintered core, porosity 60%
Holder: Acrylic, visible light transmittance 85% [Reflectance was measured with a multi-source spectrophotometer (MSC-5N, manufactured by Suga Test Instruments Co., Ltd.), and the result was regarded as visible light transmittance. same as below. ]
Calculation of the visual area (area ratio) of each pen tip was performed by measuring the actual dimensions of the molded product. The visible area (area ratio) of each pen tip is shown in Table 1 below.
Ink guiding portion: cylindrical shape, each diameter shown in Table 1 below, visible light transmittance of 27% with ink (common)
(Structure of writing implement other than pen tip)
Relay porous body: PET fiber bundle, porosity 65%, φ4 × 25 mm
Ink occlusion body: PET fiber bundle, porosity 85%, φ14 × 55 mm
Writing instrument body, tail plug, cap: Adhesion of the relay porous body, writing section porous body, and holder made of polypropylene (PP) was performed as follows.
The relay porous body and the writing portion porous body were adhered by impregnating an organic solvent (ethyl acetate) with the respective porous bodies temporarily inserted in the holder and drying.

As the porous body of the ink guide part of Comparative Example 3, a PET fiber bundle having a porosity of 65% and a diameter of 1.5 × 8 mm was used.
Comparative Example 5 is based on FIG. 1 (FIG. 12 of the present application) of Patent Document 6 (Japanese Unexamined Patent Application Publication No. 2007-69426), which is a conventional technique, and Comparative Example 6 is Patent Document 7 (Japanese Unexamined Patent Application Publication No. Japanese Unexamined Patent Publication (Kokai) No.-69427) is based on FIG. 1 (FIG. 13 of the present application), and the materials and sizes of the nibs described in Example 1 of each patent document are used.

(Ink composition, common)
A fluorescent pink ink having the following composition was used as the ink.
Coloring material: VC toner peach (manufactured by Mikuni Pigment Co.) 30 parts by mass Wetting agent: glycerin 25 parts by mass Preservative: Bioace (manufactured by KI Kasei Co., Ltd.) 0.7 parts by mass Ion-exchanged water 44.3 parts by mass

The visibility and ink flow rate were evaluated by the following evaluation methods using each of the pen tips having the above-described configuration.
The evaluation results are shown in Table 1 below.

(Visibility evaluation method)
The handwriting was written on the character, and the appearance of the other side was visually confirmed via the visual recognition part during writing, and the visibility was evaluated according to the following evaluation criteria.
Evaluation criteria for visibility:
：: Visibility is sufficient. It is very easy to read and you can write while reading characters written in the writing direction.
Δ: Insufficient visibility. Although it has a certain degree of visibility, it is necessary to watch it carefully to read characters written in the writing direction.
X: Insufficient visibility. Partly visible, but not visible during normal use.

(Evaluation method of ink flow rate)
The pen body was set on the automatic writing device, and in accordance with JIS S6037, the writing angle was 65 °, the writing power was 1N, the writing speed was 7cm / s, the distance was 20m, and the written line was written. The ink flow rate was evaluated according to the following evaluation criteria.
Evaluation criteria for ink flow rate:
：: Writability is good. There is no fading.
Δ: Insufficient writability. There is a faint stroke.
×: Insufficient writability. There are remarkable drawing lines.

As is evident from the results of Table 1 above, Examples 1 to 4 which are included in the scope of the present invention are compared with Comparative Examples 1 to 6 which are out of the scope of the present invention, in which the characters written in the writing direction are more conventional. It has been found that a sufficient visibility that can be read reliably can be provided, and that the writing instrument can be used until the end of writing.
In Comparative Examples 5 and 6 (Japanese Patent Application Laid-Open No. 2007-69426, FIG. 12 of the present application, Japanese Patent Application Laid-Open No. 2007-69427, and FIG. 13 of the present application), the writing direction can be visually recognized through the direct liquid portion. Was difficult to visually recognize during normal use, and it could not be said that sufficient visibility was imparted.

[Test Example 2: Examples 5 to 7 and Comparative Examples 7 to 8]
In Test Example 2, the bonding strength and sealing performance were evaluated by changing the bonding surface shape, bonding surface size, and bonding surface shortest length for bonding to the writing portion porous body and the holder by the following evaluation methods. The results are shown in Table 2 below.
A writing implement provided with the pen tip of Example 1 and manufactured by the following method was used.
Adhesion to the writing portion porous body and the holder was performed by the following method.
The relay porous body and the writing portion porous body were bonded by impregnating an organic solvent with the respective porous bodies temporarily inserted in the holding body and drying.

(Evaluation method of adhesive strength)
The adhered porous writing portion was peeled off with a rubber gloved hand and evaluated according to the following evaluation criteria.
Evaluation criteria for adhesive strength:
：: Adhesive strength is sufficient. When trying to peel off the porous writing portion, the porous writing portion is broken before the adhesive portion is peeled off.
Δ: Adhesive strength at a level that can withstand normal use. Insufficient adhesive strength. If the porous writing part is to be peeled off, the porous writing part will peel off. It cannot be peeled off by writing or the like.
X: Insufficient adhesive strength. The porous body of the writing portion is peeled off from the holder by writing or the like.

(Evaluation method of sealing performance)
The sealing performance was evaluated according to the following evaluation criteria to determine whether the seal was broken at the time of writing and whether the seal was broken when the pen tip was freely dropped on concrete from 150 cm upward. When the seal is broken, air (bubbles) enters the direct liquid portion and can be visually confirmed.
Evaluation criteria for sealing performance:
：: No problem in sealing performance.
Δ: The seal is broken by a drop impact or the like, and minute bubbles enter the ink guide portion.
X: Seal breakage occurs due to a drop impact or the like, and large bubbles enter the ink guide portion.

  As is clear from the results in Table 2 above, Examples 5 to 7, which fall within the scope of the present invention, are superior in adhesive strength and sealing performance as compared with Comparative Examples 7 to 8, which fall outside the scope of the present invention. found.

[Test Example 3: Examples 8 to 10 and Comparative Examples 9 to 10]
In Test Example 3, the adhesive strength and the sealing performance depending on the thickness of the resin layer of the holder were evaluated by the above-described evaluation methods. The results are shown in Table 3 below.
A writing instrument provided with the pen tip of Example 1 was used in the same manner as in Test Example 2 except that the thickness of the holder resin layer was changed.

  As is evident from the results of Table 3, Examples 8 to 10 that are within the scope of the present invention are superior in adhesive strength and sealing performance as compared with Comparative Examples 9 to 10 that are outside the scope of the present invention. found. When the thickness of the holding resin layer was less than 1 μm, the holding resin layer could not be confirmed and no adhesion was achieved. When the thickness of the support resin layer in Comparative Example 9 was 1500 μm, the ink guide portion was blocked, and the ink flow rate was extremely low.

The writing implement of the present invention can be suitably used for a writing implement of a type called an underline pen, a paint marker, an oil-based marker, or a water-based marker.

A Writing implement 10 Writing implement main body 20 Ink occlusion body 30 Intermediate porous body 40 Nib 50 Ink guide part 55 Holder

According to the present invention, with sufficient visibility can be conventionally read reliably the character is written in the writing direction is applied, without compromising visibility, the ink induction part, Lee ink supply Since it is efficiently supplied to the writing section, a sufficient writing flow rate can be used until the end of writing , and a writing instrument that can firmly fix the porous body serving as the writing section and the holding body having the ink guide section is provided. Provided.
According to the invention of claims 2 and 3, further, without impairing visibility, a sufficient writing flow rate can be ensured until the end of writing, easy to write, and a holding body having a porous body serving as a writing part and an ink guide part. Can be firmly fixed, and the fixing of the intermediary porous body and the holding member having the ink guiding portion can be surely performed, and a writing instrument excellent in durability is provided.

Claims (3)

The pen tip has a porous body serving as a writing unit, and a holding body that holds the porous body and has at least one ink guiding unit for supplying ink to the writing unit. Supplying the writing portion through the ink guide portion of the holding body, and, the holding body is a writing instrument serving as a visual recognition portion that can visually recognize the writing direction, a flange on the outer periphery of the ink guide portion of the holding body. The ink guiding portion is formed integrally with the holding member in the same material, the ink guide portion is formed in the longitudinal direction of the holding member, and the area ratio of the visual recognition portion is 40% or more of the pen tip protruding from the tip end of the writing instrument main body. A writing instrument, wherein ink is supplied directly to the ink guide section, and the total cross-sectional area of the ink guide section inside the holder is 0.01 to 7 mm ² .   The writing instrument according to claim 1, wherein the writing section is inclined with respect to a major axis direction of the main body axis.   The resin constituting the holding body enters from the holding body into the unevenness of the pores of the porous body where the writing body and the holding body are in contact with each other, and the holding body resin layer is formed to hold the holding body and the porous body. The writing instrument according to claim 1, wherein the body is fixed.

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