JP2018030293A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument which is excellent in design property and stable, and capable of writing with ink for writing so that a visible part is not disturbed by a writing part or the ink for writing.SOLUTION: A writing instrument A includes: a barrel 10 storing ink for writing; and a writing part 14 mounted on one end of the barrel. The writing part includes: a writing body 16 for guiding the ink for writing from the barrel 10 and capable of writing with the ink for writing; and a holding body 18 for holding the writing body. The holding body is formed by rigid material having visibility. The holding body is disposed with the writing body. When viewing at a specific angle, a part in which the writing body can be viewed is 50% or less of surface area of the holding body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument that enables writing from a container containing liquid writing ink through a writing unit.

  Conventionally, as shown in Patent Document 1 and Patent Document 2, a writing tool is disclosed that is easy to use for a user by providing a writing portion at the tip of a holding body having visibility so that the writing direction can be visually recognized through the holding body during writing. Has been.

  However, the presence of the ink passage in the holding body may hinder visual recognition. Therefore, the present applicant has disclosed a writing instrument in which the writing portion is a visual recognition portion by adjusting the refractive index (see, for example, Patent Document 3).

  However, the writing instrument disclosed in Patent Document 3 has a problem that it is difficult to combine the refractive indexes of the ink and the writing core.

JP 2012-20575 A JP 2014-50970 A JP 2011-46008 A

  The present invention has been made in view of the above-described conventional problems, and is capable of writing writing ink that is excellent and stable in design and in which the visual recognition portion is not obstructed by the writing portion or the writing ink. The purpose is to provide writing instruments.

  The present inventors intend to solve the above-mentioned conventional problems and the like, and in a writing instrument having a shaft cylinder containing writing ink and a writing part attached to one end of the shaft cylinder, The writing unit has a writing body capable of guiding writing ink from the shaft tube and capable of writing, and a holding body for holding the writing body, and the holding body is formed of a hard material having visibility, and the holding It is found that the above-mentioned writing instrument can be obtained by providing the cursive body on a body and making the visible portion of the cursive body below a specific value in the surface area of the holding body when viewed from a specific angle. The present invention has been completed.

  That is, the writing instrument of the present invention is a writing instrument having a shaft tube containing writing ink and a writing unit attached to one end of the shaft tube, the writing unit guiding the writing ink from the shaft tube. The writing body has a writing body and a holding body for holding the writing body, the holding body is made of a hard material having visibility, and the holding body is provided with the writing body. The portion where the cursive body can be seen in the surface area of the holder when viewed from a specific angle is 50% or less.

Further, the thickness of the holder in the cross section perpendicular to the axial direction is such that the thickest part is 1 mm or more, or the ratio of the outer diameter of the writing body to the outer diameter of the holder is 1 to 3 or more. Is preferred.
Further, it is preferable that the holding body is provided with a writing part or an ink supply part at a central part and an outer peripheral part in a radial direction.

  According to the writing instrument of the present invention, the writing unit is composed of a writing body capable of writing the writing ink from the shaft tube and capable of writing, and a holding body for holding the writing body, and the holding body is formed of a hard material having visibility. In addition, since the portion where the writing body can be seen can be visually confirmed, it is possible to make the writing portion clearer while looking at the writing target portion when writing with the writing tool from the visibility of the holding body. An excellent effect can be achieved.

It is explanatory drawing of the writing instrument which concerns on 1st Embodiment of this invention, (a) is a front view, (b) is a center longitudinal cross-sectional view of the longitudinal direction of (a), (c) is rotated 90 degrees from (a). (D) is a central longitudinal sectional view in the longitudinal direction of (c). It is a perspective view of the writing instrument of FIG. It is component drawing of the writing core of the writing instrument of FIG. 1, (a) is a perspective view, (b) is a front view, (c) is a top view. It is explanatory drawing of each part of the instruction | indication member (holding body) of the writing instrument of FIG. 1, (a) is the perspective view seen from the front, (b) is the figure seen from the front, (c) is a front view, (d ) Is a longitudinal longitudinal sectional view of (c), (e) is a view from above, (f) is a longitudinal longitudinal sectional view of (e), and (g) is a perspective view seen from the rear. (H) is the figure seen from back. It is explanatory drawing of the writing instrument which concerns on 2nd Embodiment of this invention, (a) is a perspective view from the front, (b) is a front view, (c) is a longitudinal cross-sectional view which follows the CC line of (b). It is. FIG. 6 is a part view of the supporting member (holding body) of the writing instrument in FIG. 5, (a) is a perspective view from the front, (b) is a view from the front, (c) is a front view, and (d) is (b). ) Is a longitudinal sectional view taken along the line DD, (e) is a front view rotated by 90 ° of (c), (f) is a longitudinal sectional view taken along the line FF of (b), (g) is The perspective view from back, (h) is the figure seen from back. It is explanatory drawing of the writing instrument which concerns on 3rd Embodiment of this invention, (a) is the figure seen from the front, (b) is the perspective view from the front, (c) is a front view, (d) is (a). It is a longitudinal cross-sectional view which follows the CC line. It is a component figure of the supporting member (holding body) of the writing instrument of FIG. 7, (a) is a perspective view from the front, (b) is a view seen from the front, (c) is a front view, (d) is (b) ) Is a longitudinal sectional view taken along the line DD, (e) is a front view rotated by 90 ° of (c), (f) is a longitudinal sectional view taken along the line FF of (b), (g) is The perspective view from back, (h) is the figure seen from back. It is explanatory drawing of the writing instrument which concerns on 4th Embodiment of this invention, (a) is the figure seen from the front, (b) is the perspective view from the front, (c) is a front view, (d) is (a). It is a longitudinal cross-sectional view which follows the DD line. It is a component figure of the supporting member (holding body) of the writing instrument of FIG. 9, (a) is a perspective view from the front, (b) is a view seen from the front, (c) is a plan view, and (d) is a front view. (E) is the longitudinal cross-sectional view which follows the FF line | wire of (b), (f) is the perspective view from back, (g) is the figure seen from back. The optical path of a support member (holding body) is shown, (a) is a cross-sectional view of the support member according to the fourth embodiment, (b) is the support member according to the fourth embodiment, and the streaks (concave portions) are inside. (C) is an explanatory view of the optical path of the support member of (b), (d) is a cross-sectional view of the support member according to the fourth embodiment, and (e) is (d). It is the perspective view which saw through the support member. It is explanatory drawing of the writing instrument which concerns on 5th Embodiment of this invention, (a) is the figure seen from the front, (b) is the perspective view from the front, (c) is a front view, (d) is (a). It is a longitudinal cross-sectional view which follows the DD line. It is component drawing of the supporting member (holding body) of the writing instrument of FIG. 12, (a) is a perspective view from the front, (b) is a view seen from the front, (c) is a DD line of (e). (D) is a plan view, (e) is a front view, (f) is a longitudinal sectional view taken along line FF in (b), (g) is a perspective view from the rear, (h) FIG. 4 is a rear view, (i) is a cross-sectional view taken along line II of (e), and (j) is a cross-sectional view taken along line JJ of (e). It is explanatory drawing of the modification of the writing instrument of FIG. 13, and is explanatory drawing of the optical path | route in the supporting member looked at across the same place as CC line of FIG.13 (c). It is explanatory drawing of the writing instrument which concerns on 6th Embodiment of this invention, (a) is a perspective view from the front, (b) is a side view, (c) is a longitudinal cross-sectional view which follows the CC line of (b) It is. It is component drawing of the axial cylinder of the writing instrument of FIG. 15, (a) is a front view, (b) is a perspective view, (c) is a side view, (d) is a longitudinal section which follows the DD line of (a). FIG. It is a component figure of the supporting member (holding body) of the writing instrument of FIG. 16, (a) is a perspective view from the front, (b) is a view seen from the front, (c) is a side view, (d) is (b) The longitudinal cross-sectional view which follows the DD line | wire of (), (e) is a perspective view from back, (f) is a longitudinal cross-sectional view which follows the CC line of (c). It is explanatory drawing of the transparency of the support member of the writing instrument of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In any of the embodiments, a cap (not shown) for protecting the writing unit is detachably attached to the tip of the shaft tube.

[Writing instrument of the first embodiment]
FIGS. 1-4 is a writing instrument which concerns on 1st Embodiment of this invention, and FIG.1 (a)-(d) is explanatory drawing of the writing instrument which concerns on 1st Embodiment of this invention.
As shown in FIGS. 1B and 1D, in the writing instrument A of the first embodiment, an ink occlusion body 12 is accommodated in a shaft cylinder 10 which is a writing utensil body, and ink for the writing utensil is stored in the ink occlusion body 12. Is the type that is occluded. The shaft cylinder 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, or the like, and has a cylindrical shape with a closed rear end. A rib 10 a that supports the ink occlusion body 12 is formed in the rear portion of the shaft tube 10 so as to protrude inward.
The writing instrument A is configured to connect the ink storage body 12 to the rear end of the writing section 14 and supply the writing instrument ink of the ink storage body 12 to the writing section 14.
In addition, the code | symbol LD of Fig.1 (a) has shown the longitudinal direction (axial direction) of the axial cylinder 10. FIG.

2 is a perspective view of the writing instrument A, FIGS. 3A to 3C are writing bodies 16, and FIGS. 4A to 4 H are component diagrams of the holding body 18 on which the writing body 16 is mounted.
As shown in FIG. 2, the writing unit 14 according to the first embodiment has a structure in which a writing body 16 is disposed on the outer periphery of the holding body 18 and the holding body 18 holds the writing body 16. The writing part 14 in a state where the writing body 16 is held by the holding body 18 is attached to the tip end portion of the shaft tube 10 by a cylindrical tip shaft 20.

  In the mounted state, the writing unit 14 is disposed in a state in which about half of the writing body 16 and the holding body 18 protrude from the tip end portion of the tip shaft 20 and are exposed. The tip shaft 20 has a cylindrical shape, and a tip portion of the ink storage body 12 is housed therein and is attached to the tip portion of the shaft tube 10. The space between the front end opening of the front shaft 20 and the writing portion 14 is closed by a flange portion 18b described later of the holding body 18, and the main body portion 18a is fitted into the front end opening of the front shaft 20 so that the writing portion 14 is removed. It has been stopped. The portion (visible portion 18c) where the writing body 16 is installed around the main body portion 18a of the holding body 18 is transparent or translucent, and the writing target portion is visible.

The ink occlusion body 12 is impregnated with ink for writing instruments such as water-based ink and oil-based ink. For example, natural fibers, animal hair fibers, polyacetal resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins. Resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin or other fiber bundles, processed fiber bundles such as felt, and sponge , Including porous bodies such as resin particles and sintered bodies. The ink storage body 12 is accommodated in the main body of the shaft tube 10. Although the rear end side of the shaft tube 10 is closed, it may be sealed with a tail plug formed of the same material as the shaft tube 10 or another synthetic resin material.
The composition of the ink for a writing instrument to be used is not particularly limited, and can be a suitable formulation according to the application of the writing instrument. Preferably, the ink composition for writing instruments described later is used.

Moreover, the said writing body 16 is exhibiting the general | schematic U-shape so that the substantially rectangular holding body 18 may be surrounded as shown in FIG.1 (b) and FIG.
In the first embodiment, as shown in FIG. 3A, the writing body 16 includes ink guiding portions 16a and 16a, bending portions 16b and 16b, and a writing surface portion 16c. The writing body 16 has a shape obtained by bending a belt-like body having a substantially circular cross section, and is formed of a sintered body having ink inductivity.
The writing body 16 is composed of bent portions 16b and 16b in which the leading ends of the ink guiding portions 16a and 16a are bent by approximately 45 °, and a writing surface portion 16c in which the bent portions 16b and 16b are combined and the tip is cut. ing.

The holding body 18 according to the first embodiment will be described in detail with reference to the component diagrams of FIGS.
As shown in FIGS. 1 (b) and 1 (d), the holding body 18 is fixed to the front end opening of the front shaft 20 of the shaft tube 10 by fixing the writing body 16 to the periphery.
As shown in FIGS. 4A to 4H, the holding body 18 includes a substantially bulging main body portion 18a, a flange portion 18b having an annularly enlarged diameter on the front side of the main body portion 18a, and a flange portion. The flat visible portions 18c, 18c, which have a structure extending from both sides of 18b to a substantially plate-like front, and in which the writing direction can be visually recognized, and the inclined cut surfaces 18d, 18d on the upper and lower sides of the visible portions 18c, 18c and inside the front. Have In addition, the holding body 18 includes a rear holding portion 18e that is connected to the main body portion 18a on the rear side of the main body portion 18a. Further, a holding groove 18f for fitting and holding the U-shaped writing body 16 is formed on the entire outer circumferential surface in the longitudinal direction of the holding body 18 constituted by these parts.

Further, a concave or convex fitting portion 18h for fitting to the inner periphery of the front shaft 20 is formed on the outer peripheral surface in the width direction of the main body portion 18a, and a flange portion 18b is formed on the outer peripheral surface in the longitudinal direction. From the rear to the rear holding portion 18e, air circulation grooves 18i, 18j for air replacement having a concave cross section are formed on the outer peripheral surface. The structure is such that air flows with the outside air in the shaft cylinder 10 through the air circulation grooves 18i and 18j. Due to the structure, the ink storage body 12 can be replaced with air from the ink for the writing instrument when the writing unit 14 writes.
Furthermore, in the first embodiment, the large-diameter portion 15a and the small-diameter portion 15b made of the same material as that of the ink storage body 12 are integrally formed in the central portion of the main body portion 18a of the holding body 18 in the longitudinal (radial direction) direction. An ink supply body accommodation hole 18k in which the large diameter portion and the small diameter portion in which the ink supply body 15 is accommodated communicates therethrough.

The holding body 18 according to the first embodiment is formed from a hard material, and is preferably made of a hard material that can visually recognize the writing direction, such as a metal, glass, or a resin that does not have rubber elasticity. The visible part 18c which becomes a wide smooth surface ahead, and the main-body part 18a are formed in the back. Examples of the resin having no rubber elasticity that can be visually recognized include styrene-isoprene resin, ionomer resin, SBR-PP blend resin, acrylic resin, nylon resin, polymethylpentene, PC (polycarbonate), and transparent ABS resin. Can be mentioned. The hard material only needs to have a visible light transmittance capable of visually recognizing the writing direction, and is preferably composed of a material that is 50% or more.
Note that when a material having a visible light transmittance of less than 50% is used, the target portion in the writing direction may not be effectively visually recognized, which is not preferable. In order to be able to exhibit a further good visual recognition function, a material that transmits 50% or more is preferable, and when the visible light transmittance is 80% or more, the material can be further visually recognized.

  The writing body 16 is a polymer foam such as sponge, a porous rubber body used for infiltration marks, a non-woven cloth, felt, a fiber bundle solidified with a resin, or a sintered body of metal, ceramic, or polymer. These porous members (hereinafter also the same) are covered on the outer periphery of the holding body 18 by fitting, bonding with an adhesive, or welding. ing. Note that a fitting groove or the like may be provided on the outer peripheral surface of the holding body 18 in order to further ensure the covering of the writing body 16.

In the writing instrument A according to the first embodiment, the ink supply mechanism from the ink occluding body 12 to the writing body 16 has the ink guiding portions 16 a and 16 a of the writing body 16 at the front end side of the ink occluding body 12 and the back of the ink supplying body 15. The ink for the writing instrument impregnated in the ink occlusion body 12 is supplied to the writing surface portion 16c by the capillary force through the two routes of the ink guiding portions 16a and 16a and the ink supply body 15. It has a structure. By suitably setting the capillary forces of the ink occluding body 12, the writing body 16, and the ink supply body 15, the ink supply amount by two routes from the ink occluding body 12 to the writing surface portion 16c of the writing body 16 is preferably set. Will be able to.
In addition, the writing surface portion 16c for writing a drawn line can set a suitable drawn line width by setting the width in the width direction to an appropriate length, preferably a drawn line width of 1 mm or more, more preferably The drawn line width is preferably 3 mm or more.

In this 1st Embodiment, when it sees at a specific angle, in the surface area of the holding body 18, the part which can see the said writing body 16 shall be 50% or less. That is, in the surface area of the holding body 18, the visible portion of the writing body 16 is set to be at least 50% or less, and the visible portion of the writing body 16 is reduced as much as possible. In doing so, an excellent effect is achieved that the writing portion can be made clearer while looking at the portion to be written.
Further, in the holding body 18, the thickness in the cross section perpendicular to the axial direction, the thickest part is 1 mm or more, or the ratio of the outer diameter of the writing body 16 to the outer diameter of the holding body 18 is 1 to 3 or more. By doing so, the writing portion can be further clarified while looking at the portion to be written.
Furthermore, in the first embodiment, since the holding body 18 is provided with a writing portion and an ink supply portion at the center portion and the outer peripheral portion in the radial direction, the writing surface portion 16 c of the writing body 16 from the ink storage body 12. Since the ink is supplied from two directions, the ink supply amount is suitable without causing ink supply interruption.

[Writing instrument of the second embodiment]
Next, a writing instrument according to a second embodiment of the present invention will be described.
FIGS. 5A to 5C show a writing instrument according to the second embodiment of the present invention, where FIG. 5A is a perspective view, FIG. 5B is a front view, and FIG. 5C is a cross-sectional view. FIGS. 5A to 5C are component diagrams showing a supporting member (corresponding to a “holding body”) 18B of the writing instrument.

As shown in FIG. 5 (c), the rear end of the shaft cylinder 10 that constitutes the outer portion of the writing instrument is closed, and a writing ink occlusion body 12 in which a fluid is immersed in the internal space of the shaft cylinder 10 is provided. Contained. A tip shaft 20 is attached to the tip of the shaft tube 10, and the tip shaft 20 is a cylindrical body whose inside is a stepped and tapered space. A brush-like writing portion 14B protrudes from the tip of the holding member 18B in the tip of the tip shaft 20. And the rear end of the writing part 14B is inserted and connected to the writing ink occlusion body 12, and the writing part 14B penetrates the axis of the support member 18B.
As the writing part 14B, in the case of a brush, a material in which polybutylene terephthalate fibers are bundled as a material in a bundled state so that the tip is sharpened can be used. In the case of a pen core, nylon, polyester, or acrylic is used as a material. Can be used.
Further, as shown in FIG. 5, a support member 18 </ b> B is fitted into the shaft tube 10 on the front end side of the space inner wall for filling the writing ink storage body 12.

6A to 6H are explanatory views of the support member 18B.
The support member 18B is made of a transparent body or a translucent body. The support member 18B of the present embodiment is a material having visibility, such as styrene-isoprene resin, ionomer resin, SBR-PP blend resin, acrylic resin, nylon resin, polymethylpentene, PC (polycarbonate), transparent ABS resin. The visible light transmittance is visible so that the writing direction can be visually recognized. Like the first embodiment, the material is preferably made of a material that is 50% or more. .

  As shown in FIG. 6F, grooves 32 are formed on the left and right sides of the rear portion of the support member 18B. By press-fitting the latter half portion of the support member 18B into the tip of the tip shaft 20, the groove 32 forms an air replacement hole with the tip inner wall of the tip shaft 20 (FIG. 7C). reference). Therefore, the air replacement holes are respectively opened on the left and right sides of the writing instrument.

  Further, the support member 18B tip has an outer peripheral surface that is tapered and has irregularities in the circumferential direction, and the irregularities are formed in a rib shape along the front-rear direction (longitudinal direction LD) (see FIG. 5). Presents a star shape or flower shape. Of course, this is only an example, and various shapes can be used. Since the support member 18B is transparent, the color of the writing part 14B can be easily visually confirmed, and since the outer peripheral surface of the support member 18B is uneven, the writing part 14B looks large due to the lens effect, and matching with the support member 18B is achieved. The appearance design is improved by trying to achieve this.

The writing instrument according to the second embodiment functions as follows.
That is, the fluid immersed in the writing ink occlusion body 12 (FIG. 5 (c)) is guided toward the tip by the capillary force of the writing portion 14B, reaches the tip of the writing portion 14B, and is immersed therein. It becomes possible to write to the target part. Further, the air flowing in from the air replacement hole of the groove 32 reaches the internal space of the shaft cylinder 10 where the writing ink storage body 12 exists. Thereby, the air exchange of a fluid will be performed without hindrance.

  Here, when an impact in the tip direction is suddenly applied to the writing instrument, most of the fluid is blocked by the inner step portion of the shaft tube 10, but a part thereof passes through the air replacement hole (groove 32). Become. However, since the air replacement hole has a 90 ° bent portion (32a: see FIG. 6 (f)) on the tip side and needs to go around 90 ° to the left and right sides, it does not leak directly to the outside. Then, the fluid temporarily held on the tip side in the air replacement hole is pushed back toward the writing ink occlusion body 12 again by the outside air flowing in from the air replacement hole.

[Description of ink composition for writing]
Next, the writing ink composition used for the writing instrument in the first embodiment, the second embodiment, and the third embodiment to be described later will be described.
The ink composition for writing instruments that can be used is not particularly limited. However, the ink supply mechanism is good, the drying of the writing part (pen tip) is suppressed, and the dryness of the drawn lines and the low temperature of the ink are reduced. From the standpoints of excellent stability and development of a function that does not cause bleeding or streaking in drawn lines, preferably, a coloring agent, trimethylglycine, pentaerythritol, 10% by mass or less of a water-soluble organic solvent, and water It is desirable to use an ink composition for a writing instrument containing at least

Colorants that can be used include dyes that dissolve or disperse in water, conventionally known inorganic and organic pigments such as titanium oxide, resin particle pigments containing pigments, pseudo-pigments obtained by coloring resin emulsions with dyes, fluorescence Pigments, white plastic pigments, pigments having a base layer of silica or mica and a multilayer coating of iron oxide, titanium oxide or the like on the surface layer can be used as long as the effects of the present invention are not impaired.
Examples of the dye include acid dyes such as eosin, fuoxin, water yellow # 6-C, acid red, water blue # 105, brilliant blue FCF, and nigrosine NB; direct black 154, direct sky blue 5B, violet B00B, and the like. Dyes; basic dyes such as rhodamine and methyl violet, and fluorescent dyes.

Examples of inorganic pigments include azo lakes, insoluble azo pigments, chelate azo pigments, phthalocyanine pigments, perylene and perinone pigments, and nitroso pigments. More specifically, carbon black, titanium black, zinc white, red pepper, aluminum, chromium oxide, iron black, cobalt blue, iron oxide yellow, viridian, zinc sulfide, lithopone, cadmium yellow, vermilion, cadmium red, yellow lead, Inorganic pigments such as molybdate orange, zinc chromate, strontium chromate, white carbon, clay, talc, ultramarine, precipitated barium sulfate, barite powder, calcium carbonate, lead white, pale white, bituminous, manganese violet, aluminum powder, brass powder , C.I. I. Pigment blue 17, C.I. I. Pigment blue 15, C.I. I. Pigment blue 17, C.I. I. Pigment blue 27, C.I. I. Pigment red 5, C.I. I. Pigment red 22, C.I. I. Pigment red 38, C.I. I. Pigment red 48, C.I. I. Pigment red 49, C.I. I. Pigment red 53, C.I. I. Pigment red 57, C.I. I. Pigment red 81, C.I. I. Pigment red 104, C.I. I. Pigment red 146, C.I. I. Pigment red 245, C.I. I. Pigment yellow 1, C.I. I. Pigment yellow 3, C.I. I. Pigment yellow 12, C.I. I. Pigment yellow 13, C.I. I. Pigment yellow 14, C.I. I. Pigment yellow 17, C.I. I. Pigment yellow 34, C.I. I. Pigment yellow 55, C.I. I. Pigment yellow 74, C.I. I. Pigment yellow 95, C.I. I. Pigment yellow 166, C.I. I. Pigment yellow 167, C.I. I. Pigment orange 5, C.I. I. Pigment orange 13, C.I. I. Pigment orange 16, C.I. I. Pigment violet 1, C.I. I. Pigment violet 3, C.I. I. Pigment violet 19, C.I. I. Pigment violet 23, C.I. I. Pigment violet 50, C.I. I. And CI Pigment Green 7.
As the fluorescent pigment, conventionally known ones can be used as appropriate, and examples thereof include inorganic fluorescent pigments such as zinc sulfide, zinc silicate, cadmium sulfide, strontium sulfide, calcium tungstate, and organic fluorescent pigments dyed with polymer compounds. .
Specific examples of organic fluorescent pigments include NKW series (manufactured by Nippon Fluorochemicals), Sinloi color base SW series, SF series (manufactured by Sinloihi), Victoria series such as Victoria Yellow G-20 (manufactured by Mikuni Dye) Etc.

These colorants can be used alone or in combination of two or more.
The content of these colorants can be appropriately adjusted from 0.1 to 60% by mass (hereinafter, “mass%” is simply referred to as “%”) with respect to the total amount of the ink composition.

The trimethylglycine to be used [alias: glycine betaine, (CH ₃ ) ₂ N ⁺ (CH ₃ ) CH ₂ COO ⁻ ] is used to act as a humectant and the like, and is incorporated in the aqueous ink composition for writing instruments. In this case, the ink performance is not deteriorated, and the drying resistance of the pen tip, the drying property of the drawn line, and the low temperature stability of the ink are exhibited.

The content of trimethylglycine is 0.5 to 50%, preferably 1 to 15%, more preferably 2 to 10% with respect to the total amount of the ink composition.
If this content is less than 0.5%, the effect of inhibiting the drying of the pen tip is not sufficient. On the other hand, if it exceeds 50%, the effect does not change so much, but rather the writing performance and storage stability due to increased viscosity. Will result in a decline.

Pentaerythritol [C (CH ₂ OH) ₄ ] to be used is used to act as a moisturizing agent and the like. While suppressing the drying of the ink, it is excellent in the dryness of the drawn line and the low-temperature stability of the ink, and exhibits excellent performance without bleeding and back-through in the drawn line.

The content of pentaerythritol is 0.5 to 8%, preferably 2 to 5%, based on the total amount of the ink composition.
When the content of this content is less than 0.5%, the effect of inhibiting the drying of the nib is not sufficient, and a synergistic effect with trimethylglycine cannot be exhibited, whereas it exceeds 8%. And the effect of synergism with trimethylglycine does not change so much, leading to precipitation at low temperatures and a decrease in storage stability.

Examples of the water-soluble organic solvent to be used include ethylene glycol monomethyl ether such as ethanol, isopropyl alcohol, n-butyl alcohol, alcohols such as ethylene glycol and diethylene glycol, amides such as formamide and derivatives thereof, and sulfoxides such as dimethyl sulfoxide. , Ethylene glycol monobutyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, propylene glycol methyl ether, dipropylene glycol methyl ether, tripropylene glycol methyl ether Propylene glycol butyl ether, dipropylene glycol n-butyl ether, tripropylene glycol n-butyl ether, propylene glycol phenyl ether, ethylene glycol monoethyl ether, ethylene glycol monohexyl ether, ethylene glycol monophenyl ether, ethylene glycol mono-2-ethylbutyl ether, Examples include ethers such as propylene glycol ethyl ether and propylene glycol tertiary butyl ether, and these may be used alone or in combination of two or more.
The content of these water-soluble organic solvents is 10% or less, preferably 7% or less, more preferably 5% or less, based on the total amount of the ink composition.
By setting the content of these water-soluble organic solvents to 10% or less, a function excellent in drawn line drying properties is exhibited.

  The ink composition for writing instruments used in the writing instrument of the present invention is prepared with water (purified water, distilled water, ion-exchanged water, pure water, etc.) as the balance (solvent) in addition to the above-mentioned components. For example, optional components such as surfactants, preservatives and antibacterial agents, pH adjusters, water-soluble resins, and resin emulsions can be appropriately contained within a range not impairing the effects of the present invention.

Examples of the surfactant that can be used include sorbitan fatty acid ester, glycerin fatty acid ester, decaglycerin fatty acid ester, polyglycerin fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbit fatty acid ester, polyoxyethylene glycerin fatty acid ester. , Polyethylene glycol fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene polyoxypropylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene castor oil, polyoxyethylene lanolin, lanolin, alcohol, beeswax derivative, polyoxyethylene alkyl Nonionic surfactants such as amines and fatty acid amides; alkyl sulfates, polyoxyethylenes Such as alkyl ether sulfate, N-acyl amino acid salt, N-acyl methyl taurate, polyoxyethylene alkyl ether acetate, α-olefin sulfonate, alkyl phosphate, polyoxyethylene alkyl ether phosphate Ionic surfactants; Perfluoroalkyl ethylene oxide adducts, perfluoroalkyl trimethyl ammonium salts, perfluoroalkyl carboxylates, fluorinated alkyl esters, perfluoroalkyl sulfonates, perfluoroalkyl group hydrophilic group-containing oligomers Perfluoroalkyl group hydrophilic group-containing urethane, perfluoroalkyl phosphate ester, perfluoroalkyl betaine, perfluoroalkylamine oxide, perfluoroalkylammonium salt, perfluoroa Kill alkoxylates include a fluorine-based surfactant such as perfluoroalkyl polyoxyethylene ethanol. These surfactants can be used singly or in combination of two or more.
Examples of the antiseptic or antibacterial agent include phenol, sodium omadin, sodium benzoate, and benzimidazole compounds.
Examples of pH adjusters include hydroxides of alkali metals such as sodium hydroxide, potassium hydroxide and lithium hydroxide, amine compounds such as triethanolamine, diethanolamine, monoethanolamine, dimethylethanolamine, morpholine and triethylamine, ammonia, etc. Is mentioned.
Examples of the water-soluble resin include polyacrylic acid, water-soluble styrene-acrylic resin, water-soluble styrene / maleic acid resin, water-soluble maleic acid resin, water-soluble styrene resin, polyvinyl pyrrolidone, polyvinyl alcohol, and water-soluble ester. An acrylic resin, an ethylene-maleic acid copolymer, polyethylene oxide, a water-soluble urethane resin, etc. are mentioned.
Examples of the resin emulsion include acrylic emulsion, vinyl acetate emulsion, urethane emulsion, styrene-butadiene emulsion, and styrene acrylonitrile emulsion.
These water-soluble resins and resin emulsions can be used alone or in combination of two or more.

  In order to produce the ink composition for a writing instrument, a conventionally known method can be employed. For example, a colorant, trimethylglycine, pentaerythritol, 10% by mass or less of a water-soluble organic solvent, It is obtained by mixing a predetermined amount of each component in water, including at least water, and stirring and mixing with a stirrer such as a homomixer or a disper. Further, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation, and may be prepared while defoaming, heating and cooling.

The ink composition for a writing instrument used in the writing instrument of the present invention configured as described above is excellent in dryness of drawn lines and low-temperature stability of the ink while suppressing drying of the nib, and blurs and strikethroughs in drawn lines. It can be inferred as follows whether the function that is not present is expressed.
That is, the ink composition for a writing instrument used in the writing instrument of the present invention contains at least a colorant, trimethylglycine, pentaerythritol, a water-soluble organic solvent of 10% by mass or less, and water. Glycine and pentaerythritol are components that suppress the drying resistance of the nib, and they act synergistically by using them together in a water-based ink composition for writing instruments rather than using each of these alone. Is clear. The reason for this is not necessarily clear, but it has excellent dryness of the drawn lines and low-temperature stability of the ink while suppressing the drying of the pen tip due to a synergistic effect, and demonstrates excellent performance without bleeding and back-through in the drawn lines. Guessed.
The ink composition for writing instruments used in the present invention has an extremely long-lasting effect that exerts the above effects, and has a long onset period and duration, and trimethylglycine and pentaerythritol are water-soluble. The stability over time is also excellent.
Therefore, by using the writing ink composition of the above composition for the writing tool of the present invention, when writing with the writing tool from the visibility of the holder, the writing part is made clearer while looking at the writing target part. A writing instrument that has the excellent effect that it can be used, and has excellent dryness of drawn lines and low-temperature stability of ink while suppressing dryness of the writing part (pen nib), and can exhibit functions that do not cause bleeding or show-through in drawn lines. Will be obtained.

[Writing instrument of the third embodiment]
Next, it is explanatory drawing about the writing instrument which concerns on 3rd Embodiment of this invention.
7A to 7D show a writing instrument according to a third embodiment of the present invention, in which FIG. 7A is a front view, FIG. 7B is a perspective view, FIG. 7C is a front view, and FIG. Shows a longitudinal sectional view. FIGS. 8A to 8H are component diagrams showing a support member (corresponding to a “holding body”) 18C of the writing instrument. The shaft cylinder 10, the writing ink occlusion body 12, and the front shaft 20 are assigned the same reference numerals as in the second embodiment.

  In this writing instrument, as shown in FIGS. 7A to 7D, a brush-like writing portion 14 </ b> C protrudes from the tip of the holding member 18 </ b> C into the tip of the tip shaft 20. And the rear end of the writing part 14C is inserted and connected to the writing ink occlusion body 12, and the writing part 14C penetrates the axis of the support member 18C.

  As for the writing part 14C, as in the second embodiment, in the case of a brush, a material in which the tip is sharpened in a state where polybutylene terephthalate fibers are bundled as a material can be used. As nylon, polyester, acrylic can be used.

  As shown in FIGS. 8A to 8H, the holding member 18C is made of a transparent resin and has an outer surface shape in which a large number of triangular surfaces are combined. As shown to Fig.8 (a), when it sees from the front, the symmetrical elliptical shape is exhibited. Grooves 32 are formed on the left and right sides of the rear portion of the holding member 18C. The groove 32 forms an air replacement hole with the inner wall of the front end of the front shaft 20 by press-fitting the rear half of the support member 18C into the front end of the front shaft 20 (FIG. 7D). reference)

The material of the holding member 18C may be the same as that of the first embodiment. For example, styrene-isoprene resin, ionomer resin, SBR-PP blend resin, acrylic resin, nylon resin, polymethylpentene , PC (polycarbonate) and transparent ABS resin, and preferably made of a material having a visible light transmittance of 50% or more.
Further, in order to strengthen the impression of surface reflection in the support member 18C, it is preferable that the surface that shines intermittently when the angle is changed.

The support member 18 </ b> C can make an effective shining impression when many surfaces shine one after another with a small change in angle, such as a diamond cut having many triangular surfaces.
Further, in order to strengthen the impression of the surface reflection of the support member 18C, it is better that the edge (ridge line) is firmly projected. For example, the edge radius is preferably 0.5 mm or less.

The support member 18C can emphasize both surface reflection and total internal reflection by making the transparent part (transparent resin part) thick and making the pen core thin.
Further, the support member 18C is made of a material having a high Abbe number (with a small dispersion), so that the support member 18C has a cooler light and has a high-grade shine like diamond. In this case, the high refractive index material is more likely to cause both surface reflection and total internal reflection.

[Writing instrument of the fourth embodiment]
Next, the writing instrument which concerns on 4th Embodiment of this invention is explanatory drawing.
FIGS. 9A to 9D are views of the writing instrument according to the fourth embodiment of the present invention, wherein FIG. 9A is a front view, FIG. 9B is a perspective view, FIG. 9C is a front view, and FIG. Is shown in a longitudinal sectional view. FIGS. 10A to 10G are component diagrams showing a supporting member (corresponding to a “holding body”) 18D of the writing instrument. FIGS. 11A to 11E are explanatory views of the light beam refraction state of the support member 18D.
9 to 10, the shaft cylinder 10, the writing ink occlusion body 12, and the front shaft 20 are denoted by the same reference numerals as in the third embodiment.

As shown in FIG. 10B, the support member 18D according to the fourth embodiment has a substantially pentagonal shape when viewed from the front, and has an asymmetric shape in the vertical direction.
The point that the support member 18D can contribute to light refraction when the support member 18D has a substantially pentagonal cross-sectional shape will be described with reference to FIG.

  (A)-(e) of Drawing 11 shows support member 18C concerning the 3rd embodiment, and the cross section is symmetrical at the upper and lower sides and right and left. The support member 18C has a substantially oval shape with an outer edge formed by combining straight lines when viewed in a cross section, and forms parallel surfaces such as an upper surface and a lower surface. As shown in FIG. 11A, the parallel light L1 incident from one upper surface is refracted from the surface and enters the inside, reaches the other lower surface in parallel inside, and is refracted and emitted from the other surface ( The traveling path of the light L1 is indicated by a broken line). Even if the light L1 is incident, it passes through the support member 18C, so that it is difficult for the sparkle to come out.

  On the other hand, in the support member 18D according to the fourth embodiment, as shown in FIGS. 11B, 11C, and 11D, the horizontal cross section is a pentagon that is asymmetrical in the vertical direction, and is a parallel surface. Is lost. As shown in FIG. 11C, a support member 18D having a pentagonal cross section has surfaces 18D1 to 18D5. The parallel light L2 incident from one upper surface 18D1 enters the inside after being refracted from the surface 18D1, further reflected and refracted by the lower surfaces 18D3 and 18D4, scattered upward, and reflected and refracted by other various surfaces 18D1 to 18D5. (The traveling path of the light L2 is indicated by a broken line).

  Therefore, the frequency of total internal reflection can be increased by making the outer shape of the support member 18D a pentagon or the like and eliminating the parallel plane (parallel plane). Therefore, the light L2 incident on the support member 18D is reflected by each surface and emitted so as to be emitted. When the writing instrument is used, the reflected light changes as the incident angle of light from the light source changes and shines.

  As shown in FIG. 11B, the support member 18D is a cylindrical passage through which the writing portion 14D passes. However, the outer shape can be a pentagon or the like, and parallel surfaces (parallel surfaces) can be eliminated. Then, not only the parallel plane is eliminated, but also a path 18Db that passes through the writing portion 14D in the support member 18D, as shown in FIGS. The concave portion 18Da can be formed, and the frequency of total internal reflection can be further increased by the concave stripe 18Da to further increase the brightness.

As shown in FIGS. 9 to 11, the support member 18D can emphasize both surface reflection and total internal reflection by making the transparent part thick and making the pen core thin.
Further, the support member 18D has a higher Abbe number (small dispersion) material, which is colder light and has a high-grade shine like diamond. In this case, the high refractive index material is more likely to cause both surface reflection and total internal reflection.

[Writing instrument of the fifth embodiment]
Next, the writing instrument which concerns on 5th Embodiment of this invention is explanatory drawing.
12A to 12D show a writing instrument according to a fifth embodiment of the present invention, in which FIG. 12A is a view seen from the front, FIG. 12B is a perspective view, FIG. 12C is a front view, and FIG. ) Is a longitudinal sectional view. FIGS. 13A to 13J are component diagrams showing a supporting member (corresponding to a “holding body”) 18E of the writing instrument. FIG. 14 is an explanatory diagram of the light refraction state of the support member 18D.
In FIGS. 12 to 14, the shaft cylinder 10, the writing ink occlusion body 12, and the front shaft 20 are assigned the same reference numerals as in the third embodiment and the fourth embodiment.

  As shown in FIGS. 12 and 13, the support member 18 </ b> E according to the fifth embodiment has an hourglass shape in which recesses are formed on both sides when viewed from the front, and the writing portion 14 </ b> E in the support member 18 </ b> E is formed. The pen core is made invisible from a predetermined angle (steel stipula).

  As shown in FIG. 13, the support member 18 </ b> E causes total internal reflection of light within the support member 18 </ b> E by making the core shape (that is, the internal passage shape) of the internal passage 18 </ b> Ea through which the writing portion 14 </ b> E passes square. This makes the pen core of the writing unit 14E invisible.

  Further, the support member 18E has a concave side surface 18Eb that is recessed in an outer arc shape, so that the light entering the support member 18E is refracted, and the internal passage 18Ea side is likely to be totally internally reflected.

  Further, as shown in FIG. 14, the metal pipe 34 is passed between the support member 18E and the writing portion 14E, so that the reflection function of the outer surface of the metal pipe 34 can be achieved even at an angle at which the pen core of the writing portion 14E can be seen. (Reflecting function based on surface properties such as total reflection and specular reflection) gives a shine like total internal reflection, so that the writing part 14E (pen core) in the support member 18E cannot be seen from a direction of 360 degrees. .

Further, when the support member 18E is a high refractive index material, total internal reflection is more likely to occur, and the range in which the pen core of the writing portion 14E cannot be seen becomes wider.
In a specific product of the support member 18E, as shown in FIG. 14, the concave side surface 18Eb has the effect of a concave lens, and the incident direction of incident light L3 (indicated by a two-dot chain line L3) as shown in a cross section. In contrast, the incident light L3 (reflected at the point P) is totally reflected within ± 12 degrees, so that the writing part 14E pen core becomes invisible and the stealth property is developed. That is, the incident angle becomes large at the point P and total reflection is easy.

  In this case, it is possible to provide a structure in which the reflective pipe 34 is passed through the internal passage 18Ea, the writing portion 14E is passed through the pipe 34, and the pen core of the writing portion 14E is covered with the pipe 34.

  Thereby, the incident light L3 is reflected by the wall surface of the internal passage 18Ea (internal reflection by the support member 18E) and is diffusely reflected by the pipe 34 so that the entire circumference of the writing portion 14E is difficult to see or cannot be seen. The pipe 34 is preferably made of a reflective material such as metal, and is preferably made of stainless steel, aluminum, or a nickel-chromium plated product.

As described above, in the writing instrument of the fifth embodiment, since the light incident in the support member 18E is totally reflected internally, the internal writing portion 14E cannot be seen, and the stealth property can be improved.
Therefore, the user can make a glittering impression because the internal writing portion 14E is not visible and only the reflected light of the light appears to shine. Further, the stealth can be further improved by providing the pipe 34.

[Writing instrument of the sixth embodiment]
Next, a writing instrument according to a sixth embodiment of the present invention will be described.
The writing instrument according to the sixth embodiment of the present invention is the same shape and appearance structure as the writing instrument of the fifth embodiment shown in FIGS. 12 to 14, and is omitted from illustration, but the material of the support member is different, The texture is improved by using light scattering.

The support member can be colored blue by Rayleigh scattering by adding fine particles (about several tens of nm) to the transparent resin as the material.
When viewed from a specific angle, the portion where the content liquid conduction part (writing body such as a pen core of the writing part) is visible is 50% or less in the surface area of the support member which is a transparent member of the hard pen point. Is appropriate.
Further, the thickness of the hard pen tip, that is, the transparent member in the cross section perpendicular to the axial direction LD of the support member, which is a transparent member, is 1 mm or more, or the diameter of the flow guide portion (writing portion pen core) 14E and the support member. The ratio of the outer diameter of the transparent member is preferably 1 to 3 or more. That is, the outer diameter of the transparent member is preferably at least three times the diameter of the flow guide portion 14E.

[Writing instrument of the seventh embodiment]
Next, a writing instrument according to a seventh embodiment of the present invention will be described.
15 (a)-(c) shows a writing instrument according to a seventh embodiment of the present invention, wherein (a) is a perspective view from the front, (b) is a side view, and (c) is C- in (b). It is a longitudinal cross-sectional view which follows a C line. Moreover, Fig.16 (a)-(d) is component drawing of the axial cylinder of this writing instrument. FIGS. 17A to 17F are component diagrams of a supporting member (corresponding to a “holding body”) 18F of the writing instrument. Moreover, FIG. 18 is explanatory drawing of the transparency of the supporting member 18F. 15 to 18, the shaft cylinder 10, the writing ink occlusion body 12, and the front shaft 20 are denoted by the same reference numerals as in the fifth embodiment of FIGS. 12 to 14.

  In the writing instrument according to the seventh embodiment, the support member 18F that supports the writing part (pen core) 14F inserted therein is formed of a transparent member. As shown in FIGS. 15 and 17, the support member 18F is formed by cutting substantially both side surfaces (front surface viewed from the user) into a flat surface when viewed from the front, and the entire axial cross section is approximately elliptical. Is formed in an almost emerald cut shape. Further, the support member 18F has an internal passage 18Fa formed in a hexagonal shape or a rhombus in a cross section through the inside in the axial direction, and the writing portion 14F is inserted through the internal passage 18Fa. In addition, the front-end | tip part of internal channel | path 18Fa has a circular cross section, and the cross section of the writing part 14F is match | combined with the circle.

In this case, the support member 18F is made of the same material as that of the first embodiment, the outer surface 18Fb is formed as a flat surface, and the cross section has a substantially oval shape, and the writing is made in the internal passage 18Fa. It is made difficult to see or disappear from the direction of the substantially flat outer surface 18Fb in a state where the portion 14F is passed (steel stipula).
Since the support member 18F has a shape in which a flat surface is largely arranged on the front surface, the support member 18F can have a shape capable of appealing and asserting a sense of transparency and mass.

  The structure of the support member 18F refracts the light entering the support member 18F and makes it easy to totally reflect internally on the internal passage 18Fa side. The cross section is generally hexagonal.

  In this case, it will be described that the writing unit 14F is made invisible or invisible. As shown in FIG. 18, in the core shape of the internal passage 18Fa through which the writing portion 14F passes (the shape of the internal passage 18Fa), the width W1 in the direction along the visible outer surface 18Fb is narrowed, and the angle θ is sharpened (acute angle: angle θ <90 °) to facilitate internal total reflection. The length W2 in the direction perpendicular to the outer surface 18Fb is W2, and the length W2 is longer than the width W1 (W2> W1). Preferably, half of the length is longer than the width W1 ((1/2) W2> W1).

  Thus, by making the angle θ sandwiched between the two sides on the outer surface 18Fb side having a specific hexagonal cross section (or a gentle rhombus shape) into an acute angle, the light can be totally internally reflected in the support member 18F. . Thus, the pen core of the writing unit 14F can be made invisible. Specifically, as shown in FIG. 18, the reflected light L2 from the internal passage 18Fa can be deflected in the lateral direction without going to the other outer surface 18Fb with respect to the incident light L1 to the one outer surface 18Fb. It is possible to see the back side of the writing unit 14F, and conversely, the writing unit 14F is difficult or invisible.

  As shown in FIG. 18, by sharpening the core shape of the internal passage 18Fa (the angle θ is an acute angle), the support member 18F is likely to undergo total internal reflection on the side surface of the internal passage 18Fa. The writing part 14F in the internal passage 18Fa becomes difficult to see, and there is also a secondary effect that transparency is increased and design properties are improved.

  In the writing instrument of the seventh embodiment, the writing ink occlusion body 12 is supported by the rib 10 a in the shaft tube 10. By forming the rib 10a, the thin wall portion and the surface area thereof are reduced as compared with a case where the inside of the shaft tube 10 is simply made smooth, so that the permeation of moisture from the shaft tube 10 can be reduced.

As a modification of the seventh embodiment, interference fringes can be formed on the peripheral surface of the support member 18F. In particular, the outer surface 18Fb is a flat surface, and an appearance pattern can be improved by forming an interference fringe pattern on the outer surface 18Fb.
This pattern is expensive to apply an interference fringe pattern to a mold part. Therefore, we succeeded in producing an interference fringe pattern at a low cost by simple machining with only NC machine feed control. In the mold, it was mounted as a nesting for the flat part (outer side). Further, in order to improve the transferability of the interference fringe pattern, a mold structure that is easily subjected to filling pressure is required.

  Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples.

[Example 1]
A writing instrument and ink conforming to the following configuration and FIGS. 1 to 4 were used. The size of the writing core, the holding body, etc. was as shown below.

(Configuration of Ink Supply Body 15)
PET fiber core, porosity 65%, small diameter part: φ2 × 7 mm + large diameter part: φ4 × 15 mm
(Configuration of the writing core 16)
PE sintered core, porosity 60%, stroke width of writing part 16c: 4 mm, ink guiding part: diameter φ
2mm
(Configuration of holding body 18)
Hard material: Made of acrylic resin, visible light transmittance of 80% [manufactured by Suga Test Instruments Co., Ltd., reflectance was measured with a multi-light source spectrocolorimeter (MSC-5N) to obtain visible light transmittance. ]
When viewed from the holding member 18C side at a specific angle, the portion of the holding body where the writing body was visible was 48% in the surface area of the holding body.

(Configuration of writing instrument members other than the writing core 16 and the holding body 18)
Ink occlusion body: PET fiber core, porosity 85%, φ10 × 85 mm
Writing instrument body, cap: made of polypropylene (PP)

(Ink composition)
As the ink, ink having the following composition (total 100% by mass) was used.
Moisturizer: Trimethylglycine (Glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 yellow (manufactured by Nippon Fluorescence) 40.0 mass%
Preservative: Bioace (Kai Kasei Co., Ltd.) 0.3% by mass
pH adjuster: Triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co., Ltd.) 0.2% by mass
Water-soluble organic solvent: ethylene glycol 3.0% by mass
Water (solvent): ion-exchanged water 43.5% by mass

In the writing instrument of the first embodiment, the writing unit is composed of a writing body that can write and guide the writing ink from the shaft tube, and a holding body that holds the writing body, and the holding body is formed of a hard material having visibility. In addition, since the visible part of the cursive body can be visually confirmed, it is possible to make the writing part clearer while looking at the writing target part when writing with the writing instrument from the visibility of the holding body. confirmed.
Further, in the holding body, the thickness in the cross section perpendicular to the axial direction, the thickest part is 1 mm or more, or the ratio of the outer diameter of the writing body to the outer diameter of the holding body is 1: 3. As a result, it was found that the writing portion can be further clarified while looking at the portion to be written.
Further, in the first embodiment, since the holding body is provided with the writing portion and the ink supply portion at the central portion and the outer peripheral portion in the radial direction, the ink supply from the ink occlusion body to the writing surface portion of the writing body. Since the mechanism is supplied from two directions, the ink supply amount is suitable without causing ink supply interruption.
Furthermore, this writing instrument is set in an automatic writing device, and after writing straight lines at a writing angle of 65 °, a writing load of 1 N, a speed of 7 cm / s, and a distance of 100 m on a high-quality paper surface in accordance with JIS S6037, the written drawing state is visually observed. As a result of using the above-mentioned preferred ink composition, the ink flow rate is good, and the drying of the pen tip is suppressed, while the dryness of the drawn line and the low temperature stability of the ink are excellent. It was found that the function without any strikethrough was expressed.

  The writing instrument of the present invention can be used for writing writing ink in a writing section.

DESCRIPTION OF SYMBOLS 10 Shaft cylinder 10a Rib 12 Writing ink occlusion body 14 Writing part (1st Embodiment)
14B Writing part (2nd Embodiment)
14E Writing part (5th embodiment)
14F writing part (seventh embodiment)
16 Ink guide for writing (cursive)
16A Writing ink guide (writing body)
18 Support member (holding body according to the first embodiment)
18B Support member (holding body according to the second embodiment)
18C Support member (holding body according to the third embodiment)
18D Support member (holding body according to the fourth embodiment)
18E Support member (holding body according to the fifth embodiment)
18F support member (holding body according to the seventh embodiment)
20 Lead shaft 22 Written porous body 36 Inner plug 36A Inner plug

Claims (3)

  A writing instrument having a shaft tube containing writing ink and a writing unit mounted on one end of the shaft tube, wherein the writing unit guides the writing ink from the shaft tube, and the writing ink A holding body that holds the writing body, the holding body is made of a hard material having visibility, and the writing body is provided on the holding body, A writing instrument characterized in that, when viewed at an angle, the portion of the holding body visible in the surface area of the holding body is 50% or less.   The thickness of the holder in a cross section perpendicular to the axial direction is such that the thickest part is 1 mm or more, or the ratio of the outer diameter of the writing body to the outer diameter of the holder is 1 to 3 or more. The writing instrument according to claim 1.   The writing instrument according to claim 1, wherein the holding body is provided with a writing part or an ink supply part at a central part and an outer peripheral part in a radial direction.

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