JP7502382B2 - Writing implements - Google Patents

Description

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

Conventionally, as shown in Patent Documents 1 and 2, there have been disclosed writing instruments that are easy for users to use by providing a writing part at the tip of a visible holder, allowing the writing direction to be visually confirmed through the holder when writing.

However, there is a risk that the ink passage in the holder may hinder visibility. Therefore, the applicant has disclosed a writing instrument in which the writing part is a visible part by adjusting the refractive index (for example,
See Patent Document 3.

However, the writing implement disclosed in Patent Document 3 has problems such as the difficulty in matching the refractive index 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 consideration of the above-mentioned conventional problems, and aims to provide a writing instrument that has excellent design and stability, and allows writing with writing ink such that the visible part is not obstructed by the writing part or writing ink.

The inventors sought to solve the above-mentioned problems and other issues in the conventional art, and discovered that in a writing instrument having a barrel containing writing ink and a writing part attached to one end of the barrel, the writing part guides the writing ink from the barrel and has a writing body that can be written with and a holder that holds the writing body, the holder being formed from a hard material that is visible, the writing body being attached to the holder, and the visible portion of the writing body within the surface area of the holder when viewed at a specific angle being no greater than a specific value, thereby obtaining the above-mentioned intended writing instrument, and thus completing the present invention.

In other words, the writing instrument of the present invention is a writing instrument having a barrel containing writing ink and a writing part attached to one end of the barrel, the writing part guides the writing ink from the barrel and has a writing body that can be written with and a holder that holds the writing body, the holder is formed of a hard material that is visible, the writing body is attached to the holder, and when viewed at a specific angle, the visible portion of the writing body within the surface area of the holder is 50% or less.

It is also preferable that the thickness of the holding body in a cross section perpendicular to the axial direction is 1 mm or more at its thickest part, or that the ratio of the outer diameter of the writing element to the outer diameter of the holding body is 1:3 or more.
It is also preferable that the holder has a writing portion or an ink supply portion provided at the center and outer periphery in the radial direction.

According to the writing instrument of the present invention, the writing part guides the writing ink from the barrel and includes a writing body capable of writing and a holder for holding the writing body, the holder being made of a hard material having visibility,
Furthermore, since the visible portion of the writing object can be seen in fine detail, the excellent effect of being able to make the writing portion clearer while viewing the area to be written on when holding the writing instrument and writing due to the visibility of the holder can be obtained.

1A and 1B are explanatory diagrams of a writing instrument according to a first embodiment of the present invention, in which (a) is a front view, (b) is a central longitudinal cross-sectional view in the longitudinal direction of (a), (c) is a front view rotated 90° from (a), and (d) is a central longitudinal cross-sectional view in the longitudinal direction of (c). FIG. 2 is a perspective view of the writing instrument of FIG. 1 . 2A is a perspective view of the writing lead of the writing instrument of FIG. 1; FIG. 2C is a plan view of the writing lead; FIG. 2A to 2C are explanatory diagrams of each part of the pointer member (holding body) of the writing instrument in Figure 1, where (a) is an oblique view seen from the front, (b) is a view seen from the front, (c) is a front view, (d) is a central vertical cross-sectional view in the longitudinal direction of (c), (e) is a view from above, (f) is a central vertical cross-sectional view in the longitudinal direction of (e), (g) is an oblique view seen from the rear, and (h) is a view seen from the rear. 5A to 5C are explanatory diagrams of a writing implement according to a second embodiment of the present invention, where (a) is a perspective view from the front, (b) is a front view, and (c) is a vertical cross-sectional view taken along line CC of (b). 6 is a parts diagram of the support member (holding body) of the writing instrument in FIG. 5, where (a) is an oblique view from the front, (b) is a view from the front, (c) is a front view, (d) is a longitudinal sectional view along line D-D of (b), (e) is a front view of (c) rotated 90 degrees, (f) is a longitudinal sectional view along line F-F of (b), (g) is an oblique view from the rear, and (h) is a view from the rear. 11A and 11B are explanatory diagrams of a writing instrument according to a third embodiment of the present invention, where (a) is a view from the front, (b) is a perspective view from the front, (c) is a front view, and (d) is a longitudinal cross-sectional view along line CC of (a). 8 is a parts diagram of the support member (holding body) of the writing instrument in Figure 7, where (a) is an oblique view from the front, (b) is a view from the front, (c) is a front view, (d) is a longitudinal sectional view along line D-D of (b), (e) is a front view of (c) rotated 90 degrees, (f) is a longitudinal sectional view along line F-F of (b), (g) is an oblique view from the rear, and (h) is a view from the rear. 10A and 10B are explanatory diagrams of a writing instrument according to a fourth embodiment of the present invention, in which (a) is a view from the front, (b) is a perspective view from the front, (c) is a front view, and (d) is a longitudinal cross-sectional view along line D-D of (a). 10A and 10B are component diagrams of the support member (holding body) of the writing instrument in FIG. 9, in which (a) is an oblique view from the front, (b) is a view from the front, (c) is a plan view, (d) is a front view, (e) is a longitudinal sectional view along line F-F in (b), (f) is an oblique view from the rear, and (g) is a view from the rear. 13A shows the light path of the support member (holding body), where (a) is a cross-sectional view of the support member of the fourth embodiment, (b) is a cross-sectional view of the support member of the fourth embodiment having no internal streaks (recesses), (c) is an explanatory diagram of the light path of the support member of (b), (d) is a cross-sectional view of the support member of the fourth embodiment having streaks, and (e) is a see-through oblique view of the support member of (d). 11A and 11B are explanatory diagrams of a writing instrument according to a fifth embodiment of the present invention, where (a) is a view from the front, (b) is a perspective view from the front, (c) is a front view, and (d) is a longitudinal cross-sectional view along line D-D of (a). 13 is a component diagram of the support member (holding body) of the writing instrument in Figure 12, where (a) is an oblique view from the front, (b) is a view from the front, (c) is a cross-sectional view along line D-D of (e), (d) is a plan view, (e) is a front view, (f) is a vertical cross-sectional view along line F-F of (b), (g) is an oblique view from the rear, (h) is a view from the rear, (i) is a cross-sectional view along line I-I of (e), and (j) is a cross-sectional view along line J-J of (e). 14 is an explanatory diagram of a modified example of the writing implement of FIG. 13, and is an explanatory diagram of the light path in the support member as viewed in a cross-section at the same location as line CC in FIG. 13(c). 13A to 13C are explanatory diagrams of a writing implement according to a sixth embodiment of the present invention, where (a) is a front perspective view, (b) is a side view, and (c) is a vertical cross-sectional view taken along line CC of (b). 16A to 16D are part views of the barrel of the writing implement of FIG. 15, in which (a) is a front view, (b) is a perspective view, (c) is a side view, and (d) is a vertical cross-sectional view taken along line DD of (a). 17 is a parts diagram of the support member (holding body) of the writing instrument in Figure 16, where (a) is an oblique view from the front, (b) is a view from the front, (c) is a side view, (d) is a vertical cross-sectional view along line D-D of (b), (e) is an oblique view from the rear, and (f) is a vertical cross-sectional view along line C-C of (c). FIG. 17 is an explanatory diagram of the transparency of the support member of the writing instrument of FIG. 16 .

Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In each embodiment, a cap (not shown) for protecting the writing part is removably attached to the tip of the barrel.

[Writing Instrument of First Embodiment]
1 to 4 show a writing instrument according to a first embodiment of the present invention, and FIGS. 1(a) to 1(d) are explanatory views of the writing instrument according to the first embodiment of the present invention.
1(b) and (d), the writing instrument A of the first embodiment is a type in which an ink occlusion body 12 is housed in a barrel 10 which is the main body of the writing instrument, and ink for the writing instrument is absorbed in the ink occlusion body 12. The barrel 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 10a for supporting the ink occlusion body 12 is formed inside the rear part of the barrel 10 and protrudes inward.
The writing instrument A has an ink occlusion body 12 connected to the rear end of a writing portion 14 so that ink for the writing instrument is supplied from the ink occlusion body 12 to the writing portion 14 .
In addition, the symbol LD in FIG. 1( a ) indicates the longitudinal direction (axial direction) of the barrel 10 .

FIG. 2 is a perspective view of the writing instrument A, FIGS. 3(a)-(c) are diagrams of the writing body 16, and FIGS. 4(a)-(h) are diagrams of parts of a holder 18 to which the writing body 16 is attached.
2, the writing unit 14 of the first embodiment has a structure in which the writing body 16 is disposed on the outer periphery of a holding body 18, and the holding body 18 holds the writing body 16. The writing unit 14 in a state in which the writing body 16 is held by the holding body 18 is attached to the tip of the barrel 10 by a cylindrical front barrel 20.

In the attached state, the writing part 14 is arranged in a state where about half of the writing body 16 and the holder 18 protrude and are exposed from the tip of the front barrel 20. The front barrel 20 is cylindrical, and is attached to the tip of the barrel 10 with the tip of the ink occlusion body 12 housed inside.
In addition, between the tip opening of the front barrel 20 and the writing part 14 is a flange part 18 of the holder 18 (to be described later).
The writing part 14 is prevented from coming off by fitting the main body part 18a into the tip opening of the front barrel 20. The writing part 14 is prevented from coming off by fitting the main body part 18a into the tip opening of the front barrel 20.
c) is transparent or semi-transparent, so that the writing target portion can be seen.

The ink occlusion body 12 is impregnated with writing ink such as water-based ink or oil-based ink, and includes, for example, fiber bundles made of one or a combination of two or more of natural fibers, animal hair fibers, polyacetal resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc., processed fiber bundles such as felt, and porous bodies such as sponges, resin particles, and sintered bodies. This ink occlusion body 12 is housed within the main body of the barrel 10. The rear end of the barrel 10 is closed, but
It may be sealed with a tail plug molded from the same material as the barrel 10 or from a different synthetic resin material.
The composition of the ink for a writing instrument used is not particularly limited, and a suitable blending recipe can be used depending on the application of the writing instrument, etc. It is preferable to use the ink composition for a writing instrument described below.

As shown in FIG. 1B and FIG. 2, the writing body 16 has a substantially U-shape so as to surround the substantially rectangular holding body 18 .
In the first embodiment, as shown in FIG. 3A, the writing body 16 has an ink guide portion 16a.
The writing element 16 has a bent portion 16a and a bent portion 16b, and a writing surface portion 16c. The writing element 16 has a shape obtained by bending a strip having a substantially circular cross section, and is made of a sintered body having ink conductivity.
The writing body 16 is composed of bent portions 16b, 16b formed by bending the tip side of the ink guide portions 16a, 16a at an angle of approximately 45 degrees, and a writing surface portion 16c formed by combining the bent portions 16b, 16b and cutting the tip.

The holder 18 according to the first embodiment will now be described in detail with reference to the component diagrams of FIGS.
As shown in Figs. 1(b) and (d), the holder 18 fixes the writing body 16 to the periphery.
It is fixed to the tip opening of the front barrel 20 of the barrel tube 10.
As shown in FIGS. 4A to 4H, the holder 18 is made up of a generally bulging main body 18a, a flange 18b that is annularly enlarged at the front side of the main body 18a, and a planar visible portion 18c that extends from both sides of the flange 18b toward the front in a generally plate-like shape, allowing the writing direction to be visually confirmed.
, 18c, and inclined cut surfaces 18d, 18d on the upper and lower sides and on the inner side of the front of the visible portion 18c, 18c.
The holder 18 also includes a rear holder 18e connected to the main body 18a at the rear side of the main body 18a.
A holding groove 18f into which the U-shaped writing element 16 is fitted and held is formed on the entire outer circumferential surface in the longitudinal direction.

Furthermore, a concave or convex fitting portion 18h for fitting into the inner circumference of the front barrel 20 is formed on the outer circumferential surface of the main body portion 18a in the width direction, and air circulation grooves 18i, 18j for air replacement with a concave cross section are formed on the outer circumferential surface from the flange portion 18b to the rear holding portion 18e on the outer circumferential surface in the longitudinal direction. The structure allows air to circulate with the outside air inside the barrel 10 via the air circulation grooves 18i, 18j. This structure allows air to replace the writing instrument ink stored in the ink occlusion body 12 when writing with the writing portion 14.
Furthermore, in this first embodiment, an ink supply body accommodating hole 18k is provided in the longitudinal (radial) center of the main body 18a of the holder 18, and the ink supply body 15 is accommodated in the ink supply body 15. The ink supply body 15 is an integrated large diameter portion 15a and a small diameter portion 15b made of the same material as the ink absorbing body 12. The large diameter portion 15a and the small diameter portion 15b are connected to each other.

The holder 18 according to the first embodiment is molded from a hard material, and is preferably made of a hard material that allows the writing direction to be visually confirmed, such as metal, glass, or resin that does not have rubber elasticity. The holder 18 has a visible portion 18c in the front that is a wide, smooth surface, and a main body portion 18 in the rear.
Examples of resins that do not have rubber elasticity and are visible include styrene-isoprene resin, ionomer resin, SBR-PP blend resin, acrylic resin,
Examples of the hard material include nylon resin, polymethylpentene, PC (polycarbonate), transparent ABS resin, etc. The hard material may have a visible light transmittance that allows the writing direction to be visually recognized, and is preferably made of a material with a visible light transmittance of 50% or more.
In addition, if a material with a visible light transmittance of less than 50% is used, it may be difficult to effectively view the target part in the writing direction, which is not preferable. In order to achieve better visibility, a material with a visible light transmittance of 50% or more is preferable, and if the visible light transmittance is 80% or more, it will be possible to achieve even better visibility.

The writing body 16 is made of a porous material such as a polymer foam such as sponge, a porous rubber body used in ink stamps, nonwoven fabric, felt, fiber bundles solidified with resin, or a metal, ceramic, or polymer sintered body, and these porous materials (hereinafter the same) are covered on the outer periphery of the holder 18 by fitting, bonding with an adhesive, welding, etc. Note that a fitting groove or the like may be provided on the outer periphery of the holder 18 to further securely cover the writing body 16.

In the writing instrument A of the first embodiment, the ink supply mechanism from the ink occlusion body 12 to the writing body 16 is configured such that the ink guide portions 16a, 16a of the writing body 16 and the rear portion of the ink supply body 15 are fitted into the tip side of the ink occlusion body 12, and thus the writing instrument ink impregnated in the ink occlusion body 12 is supplied by capillary force to the writing surface 16c via two routes, the ink guide portions 16a, 16a and the ink supply body 15. By suitably setting the capillary forces of the ink occlusion body 12, writing body 16 and ink supply body 15, it is possible to suitably set the amount of ink supplied from the ink occlusion body 12 to the writing surface 16c of the writing body 16 via the two routes.
Furthermore, the writing surface portion 16c on which the drawn line is drawn can be adjusted in width in the width direction to an appropriate length to set a suitable line width, and it is preferable that the drawn line width be 1 mm or more, and more preferably 3 mm or more.

In the first embodiment, when viewed at a specific angle, the visible portion of the writing body 16 is set to 50% or less of the surface area of the holder 18. In other words, the visible portion of the writing body 16 is set to at least 50% or less of the surface area of the holder 18, and the visible portion of the writing body 16 is minimized, so that when holding the writing instrument and writing, due to the visibility of the holder 18,
This provides the excellent effect of making the writing portion clearer while viewing the area to be written on.
Furthermore, by making the thickness of the holding body 18 in a cross section perpendicular to the axial direction, at its thickest point, 1 mm or more, or by making the ratio of the outer diameter of the writing body 16 to the outer diameter of the holding body 18 1:3 or more, it becomes possible to make the writing portion clearer while still being able to see the area to be written on.
Furthermore, in the first embodiment, the holder 18 is provided with a writing portion and an ink supply portion at the center and outer periphery in the radial direction, so that the ink occlusion body 12 is easily transferred to the writing surface 16 of the writing element 16.
Since the ink supply to c is a mechanism that supplies ink from two directions, the ink supply does not run out and the amount of ink supplied is optimal.

[Writing Instrument of Second Embodiment]
Next, a writing instrument according to a second embodiment of the present invention will be described.
5(a)-(c) are diagrams showing a writing instrument according to a second embodiment of the present invention, where (a) is a perspective view, (b) is a
5(a) to 5(c) are part drawings showing a support member (corresponding to a "holding body") 18B of this writing implement.

As shown in Fig. 5(c), the rear end of the barrel 10 constituting the outer part of the writing implement is closed, and the internal space of the barrel 10 contains a writing ink occluder 12 soaked in a fluid. A front barrel 20 is attached to the tip of the barrel 10, and the front barrel 20 is a cylindrical body whose interior tapers into a stepped space. A brush-shaped writing part 14B protrudes from the tip of the holding member 18B into the tip of the front barrel 20. The rear end of the writing part 14B is inserted into the writing ink occluder 12 to connect them, and the writing part 14B passes through the axis of the support member 18B.
For the writing part 14B, in the case of a brush, a material made of bundled polybutylene terephthalate fibers with a sharpened tip can be used, and in the case of a pen core, a material made of nylon, polyester, or acrylic can be used.
As shown in FIG. 5, a support member 18B is fitted into the barrel 10 at the tip end side of the inner wall of the space for filling the writing ink occluding body 12.

6(a) to (h) are explanatory diagrams of the support member 18B.
The support member 18B in this embodiment is made of a transparent or semi-transparent material having visibility, for example, styrene-isoprene resin, ionomer resin, SBR-P, etc.
It is made of materials such as P blend resin, acrylic resin, nylon resin, polymethylpentene, PC (polycarbonate), transparent ABS resin, etc., and it is sufficient if the visible light transmittance allows the writing direction to be visually confirmed, and as with the first embodiment above, it is preferable that the pen is made of a material with a visible light transmittance of 50% or more.

As shown in Fig. 6(f), grooves 32 are formed on the left and right sides of the rear part of support member 18B. By press-fitting the rear half of support member 18B into the tip of front barrel 20, air replacement holes are formed between grooves 32 and the inner wall of the tip of front barrel 20 (see Fig. 7(c)).
(See reference.) Therefore, the air displacement holes open on both the left and right sides of the writing implement.

The tip of the support member 18B has a tapered outer circumferential surface with ribs extending in the front-rear direction (longitudinal direction LD) (see FIG. 5), and has a star-shaped or flower-shaped cross section. Of course, this is just one example, and various shapes are possible.
Since the support member 18B is transparent, the color of the writing portion 14B can be easily seen, and since the outer surface of the support member 18B is uneven, the writing portion 14B appears larger due to a lens effect, and the appearance design is improved by matching it with the support member 18B.

The writing instrument according to the second embodiment functions as follows.
That is, the fluid immersed in the writing ink occlusion body 12 (FIG. 5C) is guided toward the tip of the writing part 14B by the capillary force, and reaches and immerses the tip of the writing part 14B,
It becomes possible to write at the desired location. Also, the air flowing in from the air replacement hole of the groove 32 reaches the internal space of the barrel 10 in which the writing ink occlusion body 12 exists. This allows air replacement of the fluid to be carried out without hindrance.

Here, if a sudden impact is given to the writing implement in the direction of the tip, most of the fluid is blocked by the inner step of the barrel 10, but some passes through the air replacement hole (groove 32). However, the air replacement hole has a 90° bend on the tip side (32a: see Figure 6(f)), and the fluid must turn 90° to both the left and right, so it does not leak directly into the outside world. The fluid temporarily held on the tip side inside the air replacement hole is pushed back toward the writing ink occluder 12 by the outside air flowing in from the air replacement hole during that time.

[Description of Writing Ink Composition]
Next, the writing ink compositions used in writing instruments will be described in the above first and second embodiments, and in the third and subsequent embodiments described below.
The ink composition for a writing instrument that can be used is not particularly limited, but is preferably an ink composition that improves the ink supply mechanism, prevents the writing part (pen tip) from drying out while allowing the writing line to dry quickly,
From the viewpoints of providing an ink with excellent low-temperature stability and exhibiting a function of preventing bleeding or show-through of drawn lines, it is preferable to use a composition containing a colorant, trimethylglycine, pentaerythritol, and 10% by mass of
It is preferable to use an ink composition for a writing instrument that contains at least the following water-soluble organic solvent and water.

Usable colorants include dyes that dissolve or disperse in water, conventionally known inorganic and organic pigments such as titanium oxide, resin particle pigments containing pigments, pseudopigments in which resin emulsions are colored with dyes, fluorescent pigments, white plastic pigments, pigments having a silica or mica base and a surface layer coated with a multilayer of iron oxide, titanium oxide, etc., and the like, which can be used within a range that does not impair the effects of the present invention.
Examples of dyes include acid dyes such as Eosin, Fuxin, Water Yellow #6-C, Acid Red, Water Blue #105, Brilliant Blue FCF, and Nigrosine NB; Direct Black 154, Direct Sky Blue 5B, and Violet B0.
0B and other direct dyes; basic dyes such as rhodamine and methyl violet; and fluorescent dyes.

Examples of inorganic pigments include azo lake, insoluble azo pigment, chelate azo pigment, phthalocyanine pigment, perylene and perinone pigment, nitroso pigment, etc. More specifically, inorganic pigments such as carbon black, titanium black, zinc white, red iron oxide, aluminum, chromium oxide, iron black, cobalt blue, iron oxide yellow, viridian, zinc sulfide, lithopone, cadmium yellow, vermilion, cadmium red, yellow lead, molybdate orange, zinc chromate, strontium chromate, white carbon, clay, talc, ultramarine, precipitated barium sulfate, baryte powder, calcium carbonate, white lead, dark blue, dark blue, manganese violet, aluminum powder, brass powder, etc., C.I. Pigment Blue 17, C.I. Pigment Blue 15, C.I. Pigment Blue 17, C.I. Pigment Blue 27, C.I. Pigment Red 5, C.I. Pigment Red 22, C.I. Pigment Red 38, C.I.
C.I. Pigment Red 48, C.I. Pigment Red 49, C.I. Pigment Red 53, C.I. Pigment Red 57, C.I. Pigment Red 81, C.I. Pigment Red 104, C.I. Pigment Red 146, C.I. Pigment Red 245
, C.I. Pigment Yellow 1, C.I. Pigment Yellow 3, C.I. Pigment Yellow 12, C.I. Pigment Yellow 13, C.I. Pigment Yellow 14, C
.I. Pigment Yellow 17, C.I. Pigment Yellow 34, C.I. Pigment Yellow 55, C.I. Pigment Yellow 74, C.I. Pigment Yellow 95, C
.I. Pigment Yellow 166, C.I. Pigment Yellow 167, C.I. Pigment Orange 5, C.I. Pigment Orange 13, C.I. Pigment Orange 16,
C. I. Pigment Violet 1, C. I. Pigment Violet 3, C. I. Pigment Violet 19, C. I. Pigment Violet 23, C. I. Pigment Violet 50, C. I. Pigment Green 7, and the like.
As the fluorescent pigment, a conventionally known one can be appropriately used, for example, zinc sulfide, zinc silicate,
Examples of the fluorescent pigments include inorganic fluorescent pigments such as cadmium sulfide, strontium sulfide, and calcium tungstate, and organic fluorescent pigments obtained by dyeing polymer compounds.
Specific examples of organic fluorescent pigments include the NKW series (manufactured by Nippon Fluorescent Chemical Co., Ltd.), Shinroihi Color Base SW series, SF series (manufactured by Shinroihi Co., Ltd.), and Victoria Yellow G.
-20 and the Victoria series (manufactured by Mikuni Color Co., Ltd.).

These colorants can be used alone or in combination of two or more.
The content of these colorants is 0.1 to 60% by mass (hereinafter,
"% by mass" is simply referred to as "%" (as opposed to "% by mass").

The trimethylglycine used (also known as glycine betaine, (CH ₃ ) ₂ N ⁺ (CH ₃ ) C
H ₂ COO ⁻ ) is used to act as a humectant, etc., and when incorporated into an aqueous ink composition for a writing instrument, it does not cause a decrease in the ink performance, etc., and it exhibits drying resistance of the pen tip, drying properties of the drawn lines, and low-temperature stability of the ink.

The content of trimethylglycine is desirably 0.5 to 50%, preferably 1 to 15%, and more preferably 2 to 10%, based on the total amount of the ink composition.
If the content is less than 0.5%, the effect of preventing the pen tip from drying out is insufficient.
If the content exceeds 50%, the effect will not change significantly, but rather the writing performance and storage stability will be deteriorated due to the increased viscosity.

The pentaerythritol [C(CH ₂ OH) ₄ ] used is used to act as a moisturizing agent, etc., and when used in combination with the above-mentioned trimethylglycine, it has a stronger effect than when each of them is used alone.
The synergistic effect suppresses drying of the pen tip, while providing unprecedented drying of drawn lines, excellent low-temperature stability of the ink, and excellent performance without bleeding or show-through of drawn lines.

The content of pentaerythritol is desirably 0.5 to 8%, and preferably 2 to 5%, based on the total amount of the ink composition.
If the content is less than 0.5%, the effect of suppressing drying of the pen tip is insufficient, and the synergistic effect with trimethylglycine cannot be exerted. On the other hand, if the content exceeds 8%, the effect of the synergistic effect with trimethylglycine is not so different, and precipitation at low temperatures and
This leads to a decrease in storage stability.

Examples of the water-soluble organic solvent that can be used include ethanol, isopropyl alcohol, n-
Alcohols such as butyl alcohol, ethylene glycol, diethylene glycol, amides such as formamide and its derivatives, sulfoxides such as dimethyl sulfoxide, ethylene glycol monomethyl ether, ethylene glycol monobutyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether,
Diethylene glycol monoethyl ether, diethylene glycol monobutyl ether,
Examples of ethers include 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, propylene glycol ethyl ether, and propylene glycol tertiary butyl ether. These may be used alone or in combination of two or more.
The content of these water-soluble organic solvents is desirably 10% or less, preferably 7% or less, and more preferably 5% or less, based on the total amount of the ink composition.
By controlling the content of these water-soluble organic solvents to 10% or less, excellent function of line drying property can be exhibited.

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

Examples of usable surfactants include sorbitan fatty acid esters, glycerin fatty acid esters, decaglycerin fatty acid esters, polyglycerin fatty acid esters,
Nonionic surfactants such as polyoxyethylene sorbitan fatty acid esters, polyoxyethylene sorbit fatty acid esters, polyoxyethylene glycerin fatty acid esters, polyethylene glycol fatty acid esters, polyoxyethylene alkyl ethers, polyoxyethylene polyoxypropylene alkyl ethers, polyoxyethylene alkylphenyl ethers, polyoxyethylene castor oil, polyoxyethylene lanolin, lanolin alcohol, beeswax derivatives, polyoxyethylene alkylamines, fatty acid amides, alkyl sulfates, polyoxyethylene alkyl ether sulfates, N-acyl amino acid salts, N
anionic surfactants such as α-acylmethyl taurine salts, polyoxyethylene alkyl ether acetates, α-olefin sulfonates, alkyl phosphates, and polyoxyethylene alkyl ether phosphates; and fluorine-based surfactants such as perfluoroalkyl ethylene oxide adducts, perfluoroalkyl trimethyl ammonium salts, perfluoroalkyl carboxylates, fluorinated alkyl esters, perfluoroalkyl sulfonates, perfluoroalkyl hydrophilic group-containing oligomers, perfluoroalkyl hydrophilic group-containing urethanes, perfluoroalkyl phosphates, perfluoroalkyl betaines, perfluoroalkyl amine oxides, perfluoroalkyl ammonium salts, perfluoroalkyl alkoxylates, and perfluoroalkyl polyoxyethylene ethanols. These surfactants can be used alone or in combination of two or more.
Examples of preservatives or antibacterial agents include phenol, sodium omadine, sodium benzoate, and benzimidazole compounds.
Examples of the pH adjuster include alkali metal hydroxides such as sodium hydroxide, potassium hydroxide, and lithium hydroxide; amine compounds such as triethanolamine, diethanolamine, monoethanolamine, dimethylethanolamine, morpholine, and triethylamine; and ammonia.
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, polyvinylpyrrolidone, polyvinyl alcohol, water-soluble ester-acrylic resin, ethylene-maleic acid copolymer, polyethylene oxide, water-soluble urethane resin, and the like.
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.

To produce this ink composition for writing instruments, a conventionally known method can be employed, and for example, the ink composition contains at least a colorant, trimethylglycine, pentaerythritol, 10% by mass or less of a water-soluble organic solvent, and water, and is obtained by blending predetermined amounts of each aqueous component, stirring and mixing them with a stirrer such as a homomixer or a disperser, etc. Furthermore, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation, and the ink composition may be prepared while being degassed, heated, and cooled.

The reason why the ink composition for a writing instrument used in the writing instrument of the present invention, which is configured as described above, exhibits excellent drying properties for drawn lines and low-temperature stability of the ink while suppressing drying of the pen tip, and does not cause bleeding or show-through in drawn lines, can be inferred as follows.
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, 10% by mass or less of a water-soluble organic solvent, and water, and trimethylglycine and pentaerythritol are both components that suppress the drying resistance of the pen tip, and it is clear that the combined use of these in the aqueous ink composition for a writing instrument acts synergistically rather than using each of them alone. The reason for this is not necessarily clear, but it is presumed that the synergistic effect suppresses the drying of the pen tip, while providing excellent drying properties of the drawn lines and low-temperature stability of the ink, and excellent performance without bleeding or show-through of the drawn lines.
The ink composition for a writing instrument used in the present invention has an extremely excellent sustained effect in exhibiting the above-mentioned effects, and the period during which the effects are exhibited and the duration of the effects are long. Furthermore, since trimethylglycine and pentaerythritol are water-soluble, the ink composition also has excellent stability over time.
Therefore, by using the writing ink composition of the above composition in the writing instrument of the present invention, it is possible to obtain a writing instrument that not only has the excellent effect of allowing the user to see the area to be written on more clearly while holding the writing instrument and writing due to the visibility of the holder, but also has excellent drying properties for the drawn lines and low-temperature stability of the ink while suppressing drying of the writing part (pen tip), and can exhibit the function of preventing bleeding or show-through of drawn lines.

[Writing Instrument of Third Embodiment]
Next, a drawing for explaining a writing instrument according to a third embodiment of the present invention will be described.
7(a)-(d) show a writing instrument according to a third embodiment of the present invention, in which (a) is a view seen from the front, (b) is a perspective view, (c) is a front view, and (d) is a vertical cross-sectional view.
10(a)-10(h) are part drawings showing the support member (corresponding to the "holding body") 18C of this writing implement. Note that the barrel 10, the writing ink occlusion body 12, and the front barrel 20 are denoted by the same reference numerals as in the second embodiment.

In this writing instrument, as shown in Figures 7(a) to 7(d), a brush-shaped writing part 14C protrudes from the tip of the holding member 18C into the tip of the front barrel 20.
The rear end of the writing part 14C is inserted into and connected to the support member 18C, and the writing part 14C passes through 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 made of bundled polybutylene terephthalate fibers with a sharpened tip can be used, and in the case of a pen core, a material made of nylon, polyester, or acrylic can be used.

As shown in Figures 8(a)-(h), holding member 18C is made of transparent resin and has an outer surface shape made up of a large number of combined triangular faces. As shown in Figure 8(a), when viewed from the front, it has a symmetrical oval shape. In addition, grooves 32 are formed on the left and right sides of the rear part of holding member 18C. By press-fitting the rear half of this support member 18C into the tip of front barrel 20, this groove 32 forms an air replacement hole between it and the inner wall of the tip of front barrel 20 (Figure 7(d)).
)reference)

The resin 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), transparent A
It is preferably made of a BS resin, and is preferably made of a material having a visible light transmittance of 50% or more.
In addition, in order to enhance the impression of surface reflection in the support member 18C, it is preferable that the shining surface be switched intermittently as the angle is changed.

The support member 18C can effectively create a shining impression, particularly when it is diamond cut with many triangular faces, with many faces shining one after another with small angle changes.
In order to enhance the impression of the surface reflection of the support member 18C, it is better to have a clearly defined edge (ridge line). For example, it is preferable for the edge radius to be 0.5 mm or less.

In addition, the support member 18C can enhance both the surface reflection and the internal total reflection by making the transparent part (transparent resin part) thick and making the pen core thin.
In addition, for the support member 18C, a material with a high Abbe number (small dispersion) produces a cool light and a luxurious shine like that of a diamond. In this case, a material with a high refractive index has a high surface reflection,
Both total and internal reflection are likely to occur.

[Writing Instrument of Fourth Embodiment]
Next, a drawing for explaining a writing instrument according to a fourth embodiment of the present invention will be described.
9(a)-(d) show a writing instrument according to a fourth embodiment of the present invention, in which (a) is a view seen from the front, (b) is a perspective view, (c) is a front view, and (d) is a vertical cross-sectional view.
11(a)-(g) are part drawings showing the support member (corresponding to the "holding body") 18D of this writing implement. Figures 11(a)-(e) are explanatory diagrams of the refraction state of light rays through the support member 18D.
9 and 10, the barrel 10, the writing ink occluder 12, and the front barrel 20 are designated by the same reference numerals as in the third embodiment.

As shown in FIG. 10B, a support member 18D according to the fourth embodiment has a generally pentagonal shape when viewed from the front, and is asymmetrical vertically.
The contribution of the support member 18D having a generally pentagonal cross section to the refraction of light will be described with reference to FIG.

11A to 11E show the support member 18C according to the third embodiment, and its cross section is vertically and horizontally symmetrical. The support member 18C has a generally elliptical cross section with an outer edge formed by a combination of straight lines, and has parallel surfaces such as the upper and lower surfaces.
11A, parallel light L1 incident from one upper surface is refracted from the surface and enters the interior, travels parallel inside to the other lower surface, and is refracted and emitted from the other surface (the traveling path of light L1 is shown by a broken line). Even if light L1 enters, it passes through the support member 18C, so it is difficult to produce a sparkling shine.

In contrast, in the support member 18D according to the fourth embodiment, as shown in FIGS.
As shown in FIG. 11(c), the support member 18D has a pentagonal cross section, and has no parallel faces.
Parallel light L2 incident on one of the upper surfaces 18D1 is refracted from the surface 18D1 and enters the interior, is further reflected and refracted by the lower surfaces 18D3 and 18D4 and scattered upward, and is reflected and refracted by the various other surfaces 18D1 to 18D5 before being emitted (the travel path of light L2 is shown by the dashed lines).

Therefore, by making the outer shape of the support member 18D a pentagon or the like and eliminating parallel surfaces, the frequency of total internal reflection can be increased. As a result, light L2 incident on the support member 18D is reflected by each surface and emitted, resulting in a sparkling shine. When the writing instrument is in use, the reflected light changes and shines as the angle of incidence of light from the light source changes.

As shown in FIG. 11B, the support member 18D has a cylindrical passage through which the writing part 14D passes, but the outer shape can be made pentagonal or the like to eliminate parallel surfaces.
As shown in FIG. 11(d) and (e), a concave streak (concave) 18D is formed in the core such as a cross core.
By forming the concave streaks 18Da, the frequency of total internal reflection can be further increased, thereby further increasing the brightness.

As shown in FIGS. 9 to 11, the support member 18D can enhance both the surface reflection and the internal total reflection by making the transparent part thick and the pen core thin.
Furthermore, for the support member 18D, a material with a high Abbe number (small dispersion) produces a cooler light and a luxurious shine like that of a diamond. In this case, a material with a high refractive index is more likely to cause both surface reflection and internal total reflection.

[Writing Instrument of Fifth Embodiment]
Next, a drawing for explaining a writing instrument according to a fifth embodiment of the present invention will be described.
Figures 12(a)-(d) show a writing implement according to a fifth embodiment of the present invention, with (a) being a view from the front, (b) being a perspective view, (c) being a front view, and (d) being a vertical cross-sectional view. Figures 13(a)-(j) are component diagrams showing a support member (corresponding to a "holding body") 18E of this writing implement. Figure 14 is an explanatory diagram of the refraction state of light rays of the support member 18D.
12 to 14, the barrel 10, the writing ink occluder 12, and the front barrel 20 are designated by the same reference numerals as in the third and fourth embodiments.

As shown in Figures 12 and 13, the support member 18E of the fifth embodiment has an hourglass shape with recesses formed on both sides when viewed from the front, making the pen tip of the writing portion 14E inside the support member 18E invisible from a certain angle (stealth tip).

As shown in Figure 13, the support member 18E has a core shape (i.e., internal passage shape) of the internal passage 18Ea through which the writing portion 14E passes, which has a square cross-section, thereby causing light to be totally reflected internally within the support member 18E, making the pen tip of the writing portion 14E invisible.

In addition, the support member 18E has an outer concave side surface 18Eb that is concave in an arc shape.
The support member 18E has a shape that refracts light entering the support member 18E and makes it easy for the light to be totally internally reflected on the internal passage 18Ea side.

Furthermore, as shown in FIG. 14, by passing a metal pipe 34 between the support member 18E and the writing portion 14E, even at angles where the pen tip of the writing portion 14E would normally be visible, the reflective function of the outer surface of the metal pipe 34 (reflective function due to surface properties such as total reflection and specular reflection) produces a shine similar to internal total reflection, making it possible to make the writing portion 14E (pen tip) inside the support member 18E invisible from 360-degree directions.

Furthermore, if the support member 18E is made of a high refractive index material, total internal reflection is more likely to occur, and the area of the pen tip in the writing portion 14E that is not visible becomes wider.
14, in a specific embodiment of the support member 18E, the concave side surface 18Eb exhibits the effect of a concave lens, and as shown in the cross section, incident light L3 (shown by a two-dot chain line L3) is totally reflected internally at an angle of ±12 degrees with respect to the direction of incidence of the incident light L3 (reflected at point P), thereby exhibiting stealth properties that make the pen core of the writing part 14E invisible. In other words, the angle of incidence becomes large at point P, making it easier for total reflection to occur.

In this case, a structure can be provided in which a reflective pipe 34 is passed through the internal passage 18Ea, the writing part 14E is passed through the pipe 34, and the pen core of the writing part 14E is covered by the pipe 34.

As a result, the incident light L3 is reflected on the wall surface of the internal passage 18Ea (internal reflection at the support member 18E).
At the same time, light is diffusely reflected by the pipe 34, making it difficult or impossible to see the entire periphery of the writing part 14E. The pipe 34 is preferably made of a reflective material such as metal, and stainless steel, aluminum, or a nickel-chrome plated product is preferable.

As described above, in the writing instrument of the fifth embodiment, the light incident within the support member 18E is totally reflected internally, so that the internal writing portion 14E becomes invisible, thereby improving stealth properties.
Therefore, the user can see only the reflected light and not the writing part 14E inside, which gives a dazzling impression. Also, the provision of a pipe 34 can further enhance stealth.

[Writing Instrument of Sixth Embodiment]
Next, a writing instrument according to a sixth embodiment of the present invention will be described.
The writing instrument of the sixth embodiment of the present invention has the same shape and external structure as the writing instrument of the fifth embodiment shown in Figures 12 to 14, and although not shown in the figures, the material of the support member is different, making better use of light scattering to improve the texture.

The support member can be made of a transparent resin to which fine particles (of the order of several tens of nm) have been added, so that the support member can be colored blue by Rayleigh scattering.
When viewed at a specific angle, it is appropriate that the visible portion of the liquid guide portion (writing element such as the pen core of the writing part) of the surface area of the support member, which is a transparent member of a hard pen tip, is 50% or less.
It is also preferable that the hard pen tip, that is, the thickest part of 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 ratio of the diameter of the flow guide portion (writing portion pen core) 14E to the outer diameter of the transparent member which is the support member is 1 to 3 or more. In other words, it is preferable that the outer diameter of the transparent member is 3 times or more the diameter of the flow guide portion 14E.

[Writing Instrument of Seventh Embodiment]
Next, a writing instrument according to a seventh embodiment of the present invention will be described.
Figures 15(a)-(c) show a writing implement according to a seventh embodiment of the present invention, where (a) is a perspective view from the front, (b) is a side view, and (c) is a vertical cross-sectional view taken along line CC of (b). Figures 16(a)-(d) are component diagrams of the barrel of this writing implement. Figures 17(a)-(f)
FIG. 15 is a component diagram of the support member (corresponding to the "holding body") 18F of this writing implement. Also, FIG. 18 is an explanatory diagram of the transparency of the support member 18F.
The writing ink occluding body 12 and the front barrel 20 are denoted by the same reference numerals as those in the fifth embodiment shown in FIGS.

In the writing implement according to the seventh embodiment, a support member 18F, which supports the writing part (pen core) 14F by inserting it therein, is made of a transparent material. As shown in Figs. 15 and 17, the support member 18F has both side surfaces (front surface as seen by the user) cut into flat surfaces when viewed from the front, the overall axial cross section is roughly elliptical, and the outer surface is formed in a shape of a roughly emerald cut. The support member 18F also has an internal passage 18Fa formed in a hexagonal or diamond-shaped cross section that penetrates the inside of the support member 18F in the axial direction, and the writing part 14F is inserted into the internal passage 18Fa. The tip of the internal passage 18Fa has a circular cross section, and the writing part 14F is inserted into the internal passage 18Fa.
The cross section of the 4th floor is circular.

In this case, the support member 18F is made of the same material as in the first embodiment, and the outer surface 18F
b is formed on a flat surface and has a generally elliptical cross section, and the internal passage 1
When the writing portion 14F is passed through the pen 8Fa, it is made difficult or impossible to see from the direction of the substantially flat outer surface 18Fb (stealth tip).
This support member 18F has a shape with a large flat surface disposed on the front side, so that it can have a shape that can appeal and assert a sense of transparency and solidity.

The configuration of the support member 18F refracts light entering the support member 18F, and the internal passage 1
The shape is such that total internal reflection is easily achieved on the 8Fa side. The cross section is approximately hexagonal.

In this case, the writing area 14F can be made less visible or invisible.
As shown in FIG. 8, in the core shape of the internal passage 18Fa through which the writing part 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 (
The acute angle (angle θ<90°) facilitates total internal reflection. The length perpendicular to the outer surface 18Fb is W2, and the length W2 is longer than the width W1 (W2>W1).
Preferably, 1/2 of the length is longer than the width W1 ((1/2)W2>W1).

In this way, the two outer surfaces 18Fb of the concrete cross-sectional hexagonal shape (or gentle diamond shape) are
By making the angle θ between the sides an acute angle, it is possible to cause total internal reflection of light within the support member 18F, thereby making it possible to make the pen core of the writing part 14F invisible.
Specifically, as shown in FIG. 18, the internal passage 1
The reflected light L2 from 8Fa can be deflected to the side without heading toward the other outer surface 18Fb, so that the back side of the writing part 14F is visible and conversely the writing part 14F becomes difficult to see or cannot be seen at all.

As shown in FIG. 18, by making the core shape of the internal passage 18Fa sharp (making the angle θ an acute angle), the support member 18F is more likely to be totally internally reflected by the side surface of the internal passage 18Fa.
The internal total reflection makes it difficult to see the writing part 14F inside the internal passage 18Fa, which has the secondary effect of increasing transparency and improving the design.

In the writing instrument of the seventh embodiment, the writing ink occluder 12 is supported by ribs 10a inside the barrel 10. By forming the ribs 10a, the thin-walled portion and its surface area are reduced compared to when the inside of the barrel 10 is simply made smooth, so that the permeation of moisture from the barrel 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 flat, and an interference fringe pattern can be formed on the outer surface 18Fb to improve the appearance design.
It is expensive to create this pattern by applying interference fringe patterns to mold parts. Therefore, we succeeded in creating an interference fringe pattern inexpensively by simple processing using only the feed control of an NC processing machine. In the mold, it is installed as a nest for the flat surface (outer surface). In addition, a mold structure that is easy to apply filling pressure is required to improve the transferability of the interference fringe pattern.

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

Example 1
The following writing implement and ink were used, and the dimensions of the writing core, holder, etc. were as shown below.

(Configuration of the ink supply body 15)
PET fiber core, porosity 65%, small diameter part: φ2×7mm + large diameter part: φ4×15mm
(Configuration of writing tip 16)
PE sintered core, porosity 60%, writing part 16c line width: 4 mm, ink guide part: diameter φ
2mm
(Configuration of holding body 18)
Hard material: acrylic resin, visible light transmittance 80% (reflectance was measured with a multi-light source spectrophotometer (MSC-5N) manufactured by Suga Test Instruments Co., Ltd., and the visible light transmittance was determined.)
When viewed from the side of the holding member 18C at a specific angle, the portion of the surface area of the holding body where the handwriting is visible was 48%.

(Configuration of Writing Instrument Components Other than Writing Core 16 and Holder 18)
Ink occlusion body: PET fiber core, porosity 85%, φ10×85mm
Writing instrument body, cap: Made of polypropylene (PP)

(Ink Composition)
As the ink, ink having the following composition (total 100% by mass) was used.
Moisturizing agent: Trimethylglycine (glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Colorant: NKW-4805 Yellow (manufactured by Nippon Fluorescent Co., Ltd.) 40.0% by mass
Preservative: Bioace (Keikai Chemical Co., Ltd.) 0.3% by mass
pH adjuster: triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (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 Example 1, the writing part guides writing ink from the barrel and consists of a writing body that can be written with and a holder that holds the writing body.The holder is formed from a hard material that is visible and further allows the visible part of the writing body to be seen in fine detail.It was confirmed that when holding the writing instrument and writing, the visibility of the holder allows the writing part to be made clearer while looking at the area to be written on.
It was also found that by making the thickness of the holding body in a cross section perpendicular to the axial direction, at its thickest point, 1 mm or more, or by making the ratio of the outer diameter of the writing body to the outer diameter of the holding body 1:3, it is possible to make the writing portion clearer while still being able to see the area to be written on.
Furthermore, in the first embodiment, the holder has a writing section and an ink supply section at the center and outer periphery in the radial direction, so that the ink supply from the ink occlusion body to the writing surface of the writing body is
Since the ink is supplied from two directions, the ink supply does not run out and the amount of ink supplied is optimal.
Furthermore, this writing implement was set in an automatic writing device, and a straight line was written on a wood-free paper surface at a writing angle of 65°, a writing load of 1N, a speed of 7cm/s, and a distance of 100m in accordance with JIS S6037.
When the condition of the drawn lines was visually inspected, it was found that, because the ink used had the above-mentioned preferable ink composition, the ink flow rate was good, and while the drying of the pen tip was suppressed, the ink dried well and had excellent low-temperature stability, resulting in no bleeding or show-through of the drawn lines.

The writing instrument of the present invention can be used to write with writing ink on the writing part.

10 barrel 10a rib 12 writing ink storage body 14 writing part (first embodiment)
14B Writing part (second embodiment)
14E Writing part (fifth embodiment)
14F Writing part (seventh embodiment)
16 Writing ink guide section (cursive)
16A Writing ink guide part (cursive writing)
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 tip barrel 22 writing porous body 36 inner plug 36A inner plug

Claims (1)

1. A writing instrument having a barrel containing writing ink and a writing part attached to one end of the barrel, the writing part having a writing body capable of guiding writing ink from the barrel and writing with the writing ink, and a holder for holding the writing body, the holder having an elliptical radial cross section and formed of a hard material having a visible light transmittance of 50% or more , the writing body being attached to the holder, when viewed from a specific angle, the portion of the surface area of the holder from which the writing body is visible is 50% or less, the outer peripheral surface of the tip of the holder is tapered and has unevenness in the circumferential direction, the unevenness being ribbed and formed along the longitudinal direction, and a linear groove having a 90° bend on the tip side is formed on the outer peripheral surface of the rear part of the holder , and the writing ink contains at least trimethylglycine, pentaerythritol, 10% by mass or less of a water-soluble organic solvent, and water .

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