JP2020062779A - Writing utensil - Google Patents

Abstract

To provide a writing utensil having a capability of flowing out ink and having a pen point in which an effective area of a visual recognition part that allows a writing direction with respect to whole of the pen point to be visually recognized is maximized.SOLUTION: A writing utensil A comprises a pen point 20 having a visual recognition part 25 that guides an ink supplied from a writing utensil main body 10 and allows a writing direction to be visually recognized. The pen point 20 is formed of at least transparent members. In the pen point 20 is formed a slit part 30 having capillary force for guiding an ink and is provided an air replacement part separately from the slit part 30. A tip side of the slit part 30 serves as a writing part 40.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a writing instrument having a pen tip capable of visually recognizing a writing direction, and more specifically, a pen having a maximum effective area of an ink bleeding property and a visual recognition part capable of visually recognizing the writing direction with respect to the entire pen tip. The present invention relates to a writing instrument having a tip.

Conventionally, the pen tip of a writing instrument called a paint marker, an underline marker, etc., has a wide pen core to enable wide drawing, and is excellent in visibility and workability of marking. Therefore, it is widely used.
The pen tip of a writing instrument such as a line marker generally has a rod-like bundle of synthetic resin fibers or a porous member such as a polymer sintered body, which has a capillary action, thereby forming a writing instrument main body. Writing is made possible by drawing out the ink supplied from the pen tip.

  In addition, with the spread of writing instruments that house fluorescent ink in the shaft of the writing instrument body, many types of writing instruments that enable wide line drawing, and writing instruments that use a nib with a shape have been marketed A wide selection of writing instruments can be selected according to the requirements, and the workability is also comfortable.

The applicant of the present invention has a writing instrument having a writing core that can guide and retain ink supplied from a shaft that serves as a writing instrument main body, and a writing instrument that includes a visible portion (visible portion) that can visually recognize a writing direction at a pen tip. It is disclosed (for example, refer to Patent Document 1).
With the pen tip of this type of writing instrument, the writing portion can be visually recognized, so it can be stopped quickly at the portion where the pulling end should be stopped, and excessive pulling or protrusion can be prevented. The specific configuration of the pen tip is composed of a sintered core including an ink guide portion for guiding ink and a writing portion, and a holder for holding the sintered core.

  However, since this nib has a complicated shape, a sintered core obtained by sintering thermoplastic resin particles is used. However, since the ink flow path of the sintered core is meandering, the porosity is low. However, there is a problem that the ink outflow is slightly low. Further, there is a problem that the visible portion is obstructed by the ink guiding portion on the side surface of the holder, and the effective area of the visible portion with respect to the entire pen tip is low. Further, although FIG. 13 also discloses the form of the direct liquid of the ink guiding portion, there is no air displacement action, and when air enters the ink guiding portion, there is a problem that the ink will not come out and will be blurred.

On the other hand, as a prior art such as a pen tip having a visible portion capable of visually recognizing a writing direction other than the above structure and a writing instrument using this pen tip, and a pen tip disclosing the proximity technology of the present invention, for example,
1) The ink impregnated in the ink occlusion body in the barrel is supplied to the pen tip which is a writing part via the ink guide tube, and the ink end sign of the ink occlusion body is visually recognized by the ink guide tube. In the writing instrument of an ink end detection type, the ink guiding tube has a flat plate-shaped ink guiding portion provided with a slit-shaped ink flow path having a thickness of 0.01 to 1.0 mm. In addition, the writing instrument is characterized in that the visible light transmittance of the ink guiding portion when filled with ink is 50% or more, and the writing direction immediately below the axial direction of the ink guiding portion can be visually recognized through the ink guiding portion. (For example, see Patent Document 2),
2) Ink contained in the writing instrument main body, wherein the pen tip includes a porous body that serves as a writing portion, and a holding body that holds the porous body and has at least one ink guiding portion for supplying ink to the writing portion. Is a writing tool that has a relay porous body for supplying to the ink guiding portion provided on the holding body, and the holding body is a visible portion that can be visually recognized in the writing direction, and the area ratio of the visible portion is Is 40% or more of the pen tip protruding from the tip of the writing instrument body (see Patent Document 3, for example),

3) A plurality of thin plate materials provided with at least one slit at the tip end are overlapped, and a pen member formed over the entire length as a minute gap-shaped ink flow path between the plurality of thin plate materials is used as an axis. In the pen tip attached to the cylinder, the width of the slit has a notch portion formed by a first notch process for forming a notch width equal to or larger than the plate thickness of the thin plate material, and the notch portion formed to be less than the plate thickness. A nib, which is formed by a rolling portion provided by a second rolling process (see, for example, Patent Document 4),
4) A pen tip formed by superposing two pen members facing each other and fixing their rear parts to a neck cylinder, a pen core, etc., over the entire length of the inner surface of one or both of the two pen members, or A thin film-shaped groove for forming a minute gap between the pen members, and one or a plurality of linear grooves formed along the groove and / or in communication with the groove in the thin film-shaped groove. By providing an ink flow path that communicates over the entire length from the front end to the rear end on the overlapping surface of the pen tip, the tip end portion of the pen tip has the widest paper contact portion that contacts the paper. A slit that communicates with the ink flow path that crosses the ridge portion is provided so that non-fixed portions other than at least the rear portions of the two pen members cause mutual sliding displacement due to writing pressure on the tip of the pen tip during writing. A pen tip characterized by being formed elastically (for example, Patent Document 5),
5) A thin plate having a [thickness / width] value of 0.5 or less is sandwiched between metal plates or resin plates, and both ends of the thin plate protrude from the metal plate or resin plate. A writing instrument nib (see, for example, Patent Document 6),
6) A synthetic resin nib in which two synthetic resin nibs are superposed and an ink outflow portion is integrally or separately formed at the center (for example, see Patent Document 7),
Are known.

However, the writing instrument using the pen tip described in Patent Document 2 does not have an air displacing function, and when air enters the ink guiding portion, the ink is not ejected and there is a problem such as blurring.
Further, the writing instrument using the pen tip described in Patent Document 3 does not describe that the ink guiding portion corresponding to the direct liquid portion is also transmitted, and the technical idea is different from that of the present invention.
On the other hand, although Patent Documents 4 to 7 disclose the proximity technology of the present invention, Patent Documents 4 to 6 have a common point in that the pen tip is composed of two parts. There is no description or suggestion that it has visibility. Further, in the above-mentioned Patent Document 7, the ink outflow portion is formed at the center of the two pen tip pieces, but the ink outflow portion is a relay core and does not directly eject the ink. Is different.

Japanese Patent Laid-Open No. 2000-52682 (Claims, FIG. 13, etc.) Japanese Patent Laid-Open No. 2007-69427 (Claims, FIG. 1, etc.) Japanese Unexamined Patent Application Publication No. 2012-20575 (claims, FIG. 1, etc.) Japanese Patent Laid-Open No. 2000-335165 (Claims, FIG. 25, etc.) Japanese Unexamined Patent Publication No. 9-58172 (claims, FIG. 7, etc.) JP2012-125979A (Claims, FIG. 1, etc.) Japanese Utility Model Laid-Open No. 57-149170 (claims, FIG. 1, etc.)

  The present invention, in view of the above-mentioned problems of the prior art, is intended to solve this, in a writing instrument having a pen tip that can visually recognize the writing direction, the ink outflow, and the writing direction to the entire pen tip An object of the present invention is to provide a writing instrument having a pen tip that maximizes the effective area of a visually recognizable portion.

  As a result of intensive studies to solve the above-mentioned conventional problems, the inventors of the present invention provided a pen tip having a visual recognition portion that guides the ink supplied from the writing instrument main body and can visually recognize the writing direction. A writing instrument, wherein the pen tip is formed of at least a transparent member, and the inside of the pen tip has a specific structure, etc., it was found that the above-mentioned writing instrument can be obtained, and the present invention has been completed. is there.

That is, the writing instrument of the present invention is a writing instrument that includes a pen tip having a visible portion that guides ink supplied from the writing instrument main body and that can visually recognize the writing direction, and the pen tip is at least transparent. A slit portion having a capillary force that guides ink is formed in the pen tip, and an air replacement portion is provided separately from the slit portion, and the tip side of the slit portion is a writing portion. And
The pen tip is preferably composed of at least two parts.
The slit portion is preferably formed by a protrusion provided on the surface of at least one plate member.
It is preferable that the tip end surface of the writing section has a finer slit surface or a fine textured surface having a satin finish.
The pen tip is preferably visible through the ink passing through the slit portion.

  ADVANTAGE OF THE INVENTION According to this invention, the writing instrument which maximized the ink outflow property and the effective area of the visual recognition part which can visually recognize the writing direction with respect to the whole pen point is provided.

It is drawing which shows an example of embodiment of the twin type writing instrument of this invention, (a) is a longitudinal cross-sectional view of a front view, (b) is a longitudinal cross-sectional view of a plane view, (c) is the front with one cap removed. Drawing (d) is a top view of (c). 3A and 3B are drawings showing an example of a pen nib used in the writing instrument of the present invention, in which FIG. 1A is a plan view, FIG. 1B is a left side view, FIG. 3C is a front view, FIG. Is a perspective view seen from the front side, (f) is a sectional view taken along line XX of (b), a perspective view seen from the rear side of (g), (h) is a bottom view, (i) is (c). 3 is an enlarged cross-sectional view taken along line YY of FIG. 3A and 3B are drawings showing one of the two components forming the pen tip of FIG. 2, where FIG. 3A is a plan view, FIG. 2B is a front view, FIG. 3C is a bottom view, and FIG. (E) is a perspective view seen from the rear side front, (f) is a perspective view seen from the rear side rear, (g) is a left side view, (h) is a right side view, (i) is a front side front A perspective view seen, (j) is a perspective view seen from the front side front. It is each drawing which shows the other component which comprises the pen point of FIG. 2, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a rear view, (e). Is a perspective view seen from the back side front side, (f) is a perspective view seen from the back side rear, (g) is a right side view, (h) is a left side view, (i) is a perspective view seen from the front side front Drawing (j) is a perspective view seen from the front side front. It is drawing which shows an example of the molded article of 2 parts which comprises the pen point before assembling the pen point of FIG. 2, (a) is a front view, (b) is a top view, (c) is a rear view. It is each drawing which shows the other example of the pen point used for the writing instrument of this invention, (a) is a top view, (b) is a left side view, (c) is a front view, (d) is a right side view, (e) ) Is a perspective view seen from the front side, (f) is a vertical cross section of (c), perspective view seen from the rear side of (g), (h) is a bottom view, (i) is (c) of (c). ) Is a cross-sectional view taken along line YY of FIG. It is each drawing which shows one component which comprises the pen point of FIG. 6, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a rear view, (e). Is a perspective view seen from the back side front, (f) is a perspective view seen from the back side rear, (g) is a left side view, (h) is a right side view, (i) is a perspective view seen from the front side front Drawing (j) is a perspective view seen from the front side back. It is each drawing which shows the other component which comprises the pen point of FIG. 6, (a) is a top view, (b) is a front view, (c) is a bottom view, (d) is a rear view, (e). Is a perspective view seen from the back side front side, (f) is a perspective view seen from the back side rear, (g) is a right side view, (h) is a left side view, (i) is a perspective view seen from the front side front Drawing (j) is a perspective view seen from the front side front. It is drawing which shows an example of the nib before assembling the nib of FIG. 6, (a) is the perspective view seen from the front side, (b) is the perspective view top view seen from the rear side, (c) is the left side A plan view, (d) is a plan view, and (e) is a right side view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 is a drawing showing an example of an embodiment of a twin type writing instrument of the present invention, FIG. 2 is a drawing showing an example of a pen tip used in the writing instrument of FIG. 1, and FIGS. 3 and 4 are pen tips. FIGS. 5A and 5B are drawings showing two parts constituting the above, and FIG. 5 is a drawing showing an example of a molded product of two parts forming the pen tip before assembling the pen tip of FIG.
As shown in FIGS. 1A to 1D, the writing instrument A according to the present embodiment has a pen tip having a visual recognition portion 25 that guides the ink supplied from the writing instrument body 10 and can visually recognize the writing direction. It is a twin-type writing instrument that is provided with 20 and a rod-shaped pen tip 50 on the opposite side of the pen tip 20. Further, on both sides of the writing instrument main body 10, a cap 60 having a clip portion 60a that protects the pen tip 20 that is removable and a cap 70 that protects the pen tip 50 are attached.

The writing instrument main body 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, or the like, and is made of a cylindrical body that accommodates the ink occlusion body 15 impregnated with the writing instrument ink. The holding portion 11 has a fitting portion for fixing the holding tool 55 for holding the fine pen-shaped pen tip 50 by fitting, and at the other end on the left side, the writing direction can be visually recognized. A tip shaft 16 for fixing the pen tip 20 having a visible portion 25 that can be attached is attached.
The writing instrument main body 10 is formed into a cylindrical shape using a resin such as polypropylene, and functions as a writing instrument body (shaft). The writing instrument body 10 is molded opaquely or transparently (and semi-transparently), but either may be adopted from the viewpoint of appearance and practical use.

  The ink occlusion body 15 is impregnated with ink for writing instruments such as water-based ink and oil-based ink, and is, for example, natural fiber, animal fiber, polyacetal resin, acrylic resin, polyester resin, polyamide resin, polyurethane resin. Resin, polyolefin resin, polyvinyl resin, polycarbonate resin, polyether resin, polyphenylene resin, etc. Fiber bundles made of one kind or a combination of two or more kinds, processed fiber bundles such as felt, and sponge , A resin particle, a sintered body, or other porous body. The ink occlusion body 15 is housed and held in the writing instrument body 10.

The composition of the writing instrument ink to be used is not particularly limited, and depending on the application of the writing instrument and the like, it may be a suitable formulation of water-based ink, oil-based ink, thermochromic ink, and the like. The ink may contain a fluorescent dye such as Basic Violet 11, Basic Yellow 40, and thermochromic microcapsule pigment.
These inks have an ink viscosity (25 ° C .: complate type viscometer) of 1 to 5 mPa · s, a surface tension of 30 to 60 mN / m, a pen tip 20 and It is preferable to set the ink outflow amount from the pen tip 50 to 30 to 60 mg / m.
When the writing instrument ink is a thermochromic ink, a thermoplastic elastomer can be formed on the top of the cap 60 to provide a friction body that easily generates frictional heat by a rubbing operation.

The nib 20 is entirely made of a transparent member, and as shown in FIGS. 2A to 2I, a slit having a capillary force for guiding ink from the writing instrument body 10 in the nib 20. The portion 30 is formed, and the air replacement portion 35 is provided separately from the slit portion 30, the tip end side of the slit portion 30 becomes the writing portion 40, and the rear side of the ink storage body 15 absorbs ink by capillary force. Is the ink introduction slit portion 31 to be taken in.
In the present embodiment, as shown in FIGS. 3 and 4, the pen tip 20 is configured by integrating at least two components 21, 22 by welding, bonding, fitting, etc. The projecting main body portion 23 has a flange portion 24 and a rectangular-shaped visual recognition portion (window portion) 25 mainly for visually recognizing the writing direction on the front side of the main body portion 23. The outer edge of the visual recognition portion (window portion) 25 is a curved surface with the outer periphery rounded.
The rear side of the main body 23 has a substantially triangular shape that is inserted into the rear body portion 26 fitted to the rear end side of the front shaft 16 and the front end side of the ink occlusion body 15 housed in the writing instrument main body 10. And an insertion portion 27.
Further, a concave fitting portion 23a is formed on the outer peripheral surface in the width direction of the main body portion 23, and a curved air circulation groove 23b, which is an air circulation groove, is formed on each of both surfaces to be the outer peripheral surface in the longitudinal direction. -Shaped air circulation groove 23c is formed.

The slit portion 30 formed in the pen tip 20 has a capillary force that guides the ink from the writing instrument body 10, and serves as an ink introduction port formed in the insertion portion 27 of the pen tip 20 on the rear end side. The ink introduction slit portion 31, the slit main body portion 32 that supplies the ink introduced into the ink introduction slit portion 31 to the writing portion 40 formed on the tip end side of the pen tip 20 by capillary force, and the slit portion 30 The tip side (exit) is configured by a writing section 40 having a slit formed on the writing ridgeline.
Further, in the nib 20, air replacement portions 35, 35, which are air escape grooves, are formed on the upper and lower sides of the slit body 32 in addition to the slit body 32 on the rear side of the writing portion 40. This is to solve the problem that ink does not come out of the writing section 40 when air enters the slit main body section 32 inside and the ink is blown out, and when the ink runs out, air is provided separately from the slit main body section 32. The air replacement portion 35 allows the pen tip 20 to escape toward the main body portion 23.

As shown in FIGS. 3 and 4, the slit 30 is made by integrating the two parts 21 and 22 by welding, bonding or the like to manufacture the pen tip 20, and the slit 30 is formed in the pen tip 20. Will be formed.
The two parts 21 and 22 are made of a transparent member because the entire pen tip 20 is made of a transparent member, and therefore these parts are also made of a transparent member. For example, one of the components 21 has a plate member 21a for forming the visible portion 25 on one side and a body member 21b for forming the body portion 23 on one side of the pen tip 20. The other component 22 has a plate member 22a for forming the visible portion 25 on one side and a main body member 22b for forming the main body portion 23 on one side of the pen tip 20. Has an end face of the projection portion 34, 34 forming the outer edge of the visual recognition portion (window portion) 25, and concave air replacement portions 35, 35 are formed on the lower side and the upper side thereof. Of the ink introduction slit section 31 and the writing section 40 of The outer edges other than the above are integrated by adhering or welding, and the writing tip 40, the visual recognition portion 25, the flange portion 24, the main body portion 23, and the like shown in FIG. The slit 30 having the ink introduction slit portion 31, the slit body portion 32, the air displacement portion 35, etc. will be formed.

  As shown in FIG. 2F and the like, the pen tip 20 configured in this way has a slit portion 30 formed in the entire length of the pen tip 20 in the longitudinal direction. It is to be visible through. Therefore, in order to provide visibility (transparency) while imparting a capillary force to secure a sufficient ink flow rate, the slit width of the slit main body 32 (gap, the same applies below) is a slit width that can impart the capillary force. From the viewpoint of ensuring the visibility of the written portion through the ink (light transmittance of 50% or more), the thickness is preferably 10 to 200 μm, and more preferably 30 to 70 μm.

Further, the slit width (gap) of the ink introducing slit portion 31 may be a width that allows the ink occluded in the ink occluding body 15 to be efficiently introduced into the slit body portion 32 of the pen tip 20, and preferably 5 to 500 μm. , And more preferably 10 to 40 μm.
The ink introducing slit portion 31 is formed in the central portion of the substantially triangular insertion portion 27 when the components 21 and 22 are integrated, as shown in FIGS. By changing the shape of the insertion portion, the slit length (ink introduction length) also changes.
The length in the width direction and the length in the longitudinal direction of the slit body 32 vary depending on the type of writing instrument, the shape and size of the pen tip, etc. It may be a (area), preferably, the per area of the slit portion 30, 0.2~2.0cm ^2, it is desirable to 0.1～1.0Cm ² in the area of the visible portion.

Further, the slit width (gap) of the writing portion (writing ridgeline) 40 is preferably 5 to 500 μm from the viewpoint of ink outflow, ensuring a good writing line, and the like. The writing part (writing ridge) slit is formed in the central portion of the tip side of the pen tip 20 when the parts 21 and 22 are integrated, as shown in FIGS. 2 (b) and 2 (e). It is desirable that the length (drawing line width) H is set to at least 1 mm or more, preferably 2 to 5 mm.
As a more preferable writing portion (writing ridgeline) 40, it is desirable to use a fine slit surface with a slit width (gap) of 10 to 40 μm, and a satin-like fine uneven surface on the slit periphery, for example, 20 to 1000 μm. It is desirable to form the fine uneven surface.

  In the present embodiment, the slit of the writing portion (writing ridgeline) 40 is formed by the length (drawing line width) H, and no other portion is formed, and the pen tip side surface is formed. It is not exposed and is dented from the side of the pen tip. Furthermore, the slit side surface may be partially sealed.

The pen tip 20 configured in this way is formed of, for example, a transparent member, and is formed of, for example, glass, a transparent resin material, or preferably a transparent resin material having no rubber elasticity. Is. For example, visible light transmittance of PP, PE, PET, PEN, nylon (including amorphous nylon in addition to general nylon such as 6 nylon and 12 nylon), acrylic, polymethylpentene, polystyrene, ABS, etc. As described above, the slits 30, 31, the writing part 40, etc. are formed by using at least two parts 21, 22 using 50% or more of the material, as shown in FIGS. 3 and 4. It can be configured by integration by welding, adhesion, fitting, etc., and in the present embodiment, it is integrated by welding or adhesion, and the pen tip 20 shown in FIGS. A slit portion 30 having a capillary force that guides ink from the writing instrument body 10 is formed therein, and an air replacement portion 35 is provided separately from the slit portion 30, and the writing portion is provided on the tip side of the slit portion 30. And parts 40, so that the pen tip having such an ink introducing slit portion 31 on the rear side is manufactured. The visible light transmittance can be determined by measuring the reflectance with a multi-light source spectrocolorimeter (manufactured by Suga Test Instruments Co., Ltd. (MSC-5N)).
5A to 5C show an example of a molded product of the above-mentioned two components 21 and 22. This molded product is obtained by integrally molding a product in which the parts 21 and 22 are connected by the connecting piece x in the central part using a mold or the like, and then cutting (removing) the connecting piece x in the central part. Two parts 21 and 22 having the configurations shown in FIGS. 3 and 4 are manufactured.

As shown in FIGS. 1A and 1B, the pen tip 50 is a rod-shaped pen tip of a fine character type, has a circular cross section, and has a rear end portion (on the ink storage side). ) Is inserted in the ink occlusion body 15, and the ink of the ink occlusion body is supplied to the pen tip 50 by the capillary force.
The pen tip 50 is made of a porous member, and includes, for example, natural fibers, animal hair fibers, polyacetal resins, polyethylene resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins, Parallel fiber bundles made of one or a combination of two or more of polyolefin-based resins, polyvinyl-based resins, polycarbonate-based resins, polyether-based resins, polyphenylene-based resins, etc., processed fiber bundles such as felt, or resin of these fiber bundles It consists of a processed fiber core or a porous body (sintered core) obtained by sintering plastic powder such as thermoplastic resin such as polyolefin resin, acrylic resin, polyester resin, polyamide resin and polyurethane resin. It is a thing.
The preferable nib 50 is a fiber bundle core, a fiber core, a sintered core, a felt core, a sponge core, an inorganic porous core, and particularly preferably a fiber core from the viewpoint of deformation moldability and productivity. desirable. Further, the porosity, size, hardness, etc. of the pen tip 50 used vary depending on the ink type, writing instrument type, etc. For example, the porosity is preferably 30 to 60%. The porosity is calculated as follows. First, a writing core having a known mass and an apparent volume is dipped in water, sufficiently soaked in water, and then the mass is measured in a state of being taken out from the water. The volume of water soaked in the writing core is derived from the measured mass. The porosity is calculated from the following equation, assuming that the volume of this water is the same as the pore volume of the writing core.
Porosity (unit:%) = (volume of water) / (apparent volume of pen tip 50) × 100

  In the writing instrument A configured as described above, the ink occluding body 15 occluding the ink for the writing instrument is inserted and held in the writing instrument body 10 of the writing instrument, and the tip end side of the pen tip 20 having the above configuration is inserted through the tip shaft 16. The twin type writing instrument A can be easily manufactured by fixing the ink absorbing body 15 by sequentially fitting and then fixing the holding tool 55 having the other end side to which the pen tip 50 is fixed by fitting. The occluded ink is efficiently supplied to the writing section 40 of the pen tip 20 and the pen tip 50 by capillary force, and is used for writing.

In this writing instrument A, the pen tip 50 is the same as a conventional general-purpose pen tip, so the function and the like of the pen tip 20 will be described below.
As shown in FIGS. 1 and 2, the pen tip 20 of the writing instrument A has a visual recognition portion (window portion) 25 that allows visual recognition of the writing direction, and the ink of the ink occlusion body 15 has a capillary force. From the ink introduction slit portion 31 of the slit portion 30 having a slit, passes through the slit main body portion 32, reaches the writing portion 40 in which the slit on the tip side of the pen tip 20 is formed, and is used for writing. It will be one. When writing, if you look at the viewing side with the viewing part (window) 25, it will be easier to align the starting position of the pulling, and you can stop at the part you want to stop pulling, preventing excessive pulling or sticking out. You will be able to.
In the present invention, as shown in FIG. 2 (f), the pen tip 20 has the slit portion 30 having the above-described suitable slit width (gap) formed in the entire pen tip 20, and the inside of the slit portion 30 has a capillary force. By virtue of the ink passing therethrough, the entire visible portion (window portion) 25 can be visually recognized. Therefore, the capillary force is imparted to secure a sufficient ink flow rate and the visibility (transparency) is provided. . With the writing instrument A having the pen tip 20 having this configuration, it is possible to obtain a writing instrument that maximizes the ink outflow property and the effective area of the visible portion 25 where the writing direction with respect to the entire pen tip 20 can be visually confirmed.
Further, in the present invention, since the writing can be performed directly with the slit of the writing portion (writing ridgeline) 40, the entire nib 20 can be visually recognized (window portion) without using a pen core such as a sintered core or a fiber core. ), The assembly can be simplified, and the quality stability can be improved.
Furthermore, since the air replacement portion 35 is formed in the pen tip 20, when air enters the slit body portion 32 in the pen tip 20, the ink does not come out of the writing portion 40, and there is a problem such as blurring. When the ink runs out, the air displacing portion 35 allows the air to escape toward the main body portion 23 of the pen tip 20, so that the problem such as blurring is solved.

Since the writing instrument of the present invention is characterized by including the pen tip 20 having the above-described configuration, the configuration other than the pen tip 20 is not particularly limited.
6 to 9 are drawings showing other examples of the writing instrument according to the present invention. In addition, when it has the same structure and function as the writing instrument A of the said embodiment, the same code | symbol is attached and the description is abbreviate | omitted.
The writing instrument of the present embodiment is different from the writing instrument A of the above embodiment in that the manufacturing means of the pen tip 20 having the above-described configuration is different.
In the writing instrument A of the above-described embodiment, the two components 21 and 22 are integrated by welding, bonding, or the like to form the slits 31 and 32 and the slit of the writing section 40. As shown in FIGS. 6 to 9, the writing instrument of FIG. 6 has slits at four positions at the upper, lower, front and rear ends of the plate member 21a (22a) of one of the two components 21, 22 that constitutes the slit body 32. Protrusions 34 for adjusting the width (gap) are provided. Further, by providing the protrusions 36, 36 ... And the recesses 37, 37 ... Which are fitted to the respective protrusions 36, 36 ... In the other part 22, and are integrated by press fitting or the like, the writing instrument A of the above embodiment. Thus, the pen tip 20 having the same slits 31 and 32 and the slit of the writing unit 40 is obtained. In addition, as another integration means, for example, an adhesive or the like may be used on the surfaces of the protrusions 36, 36 ...

In the writing instrument of this embodiment, the slit width (gap) is adjusted to 40 μm.
As shown in FIGS. 6 and 7, the pen tip 20 of this writing instrument also has a visual recognition portion (window portion) 25 that allows visual recognition of the writing direction, and the slit width ( The gap) is appropriately adjusted, and the ink in the ink occlusion body 15 flows into the pen tip 20 from the ink introduction slit portion 31 of the slit portion 30 having a capillary force, passes through the slit body portion 32, and the tip of the pen tip 20. It reaches the writing section 40 in which the side slit is formed and is used for writing. When writing, if you look at the viewing side with the viewing part (window) 25, it will be easier to align the starting position of the pulling, and you can stop at the part you want to stop pulling, preventing excessive pulling or sticking out. You will be able to. The slits 31 and the writing portion 40 may have slit widths (gap) widened by post-processing such as laser processing and cutting processing to the above-described suitable slit width range. It is also possible to adjust the slit width (gap) of each of the slits 31, 32 and the writing portion 40 by adjusting the height of the protrusions 36, 36, the depth of the recesses 37, 37, and the like.

Like the above-described writing instrument A, the pen tip 20 is visible through the entire visual recognition portion (window portion) 25. Therefore, the capillary force is applied to ensure sufficient ink flow rate and visibility (transparency). ), It is possible to obtain a writing instrument that maximizes the ink outflow property and the effective area of the visible portion 25 that allows the writing direction with respect to the entire pen tip 20 to be visually recognized.
Further, also in this writing instrument B, since the writing can be performed directly with the slit of the writing portion (writing ridgeline) 40, the assembly can be further simplified and the quality stability can be improved. Further, as shown in FIG. 6 (f) and FIG. 6 (i), the air replacement portion 35 is arranged so that the air is moved from the protrusions 34, 34 ... To the openings 38, 38. It will be configured to escape. When air enters the slit body portion 32, the ink does not come out of the writing portion 40 and is smeared. When the ink runs out, the air is released to the air replacement portion 35 in the openings 38, 38 direction. Since it has a configuration, it is a configuration that solves the problems such as blurring described above.

The writing instrument of the present invention is not limited to the above-described embodiment and the like, and can be variously modified without departing from the technical idea of the present invention.
In the above-described embodiment, the twin type writing instrument is shown, but the pen tip 50 may be omitted (the shaft body is a cylindrical body with a bottom), and a single type writing tool provided with the pen tip 20 may be used. There is also a writing instrument in which the pen tip 20 appears and disappears by a knock method.
In the writing instrument of each of the above-described embodiments, the cross-section of the shaft body of the writing instrument main body is formed into a circular axis, but it may have an irregular shape such as a triangular shape, a square shape of a square or more, or an elliptical shape. Further, although the case where the entire pen tip 20 is made of a transparent member is shown, at least the visual recognition part 25 is made of a transparent member, and the main body 23 side to be mounted in the writing instrument main body is made of a resin member other than the transparent member. The pen tip 20 may be configured by using a two-color molded product.

Furthermore, in each of the above-described embodiments, the ink for writing instruments (water-based ink, oil-based ink, thermochromic ink) has been described, but it may be a liquid such as liquid cosmetics, liquid medicines, coating liquids, and correction liquids. is there.
Furthermore, in the above embodiment, the nib 20 is integrated by welding, adhering, fitting or the like of at least two parts 21 and 22, but the nib 20 may be manufactured using a 3D printer. The slits 30 and 31, the air replacement portion 35, and the writing portion 40 may be manufactured by molding the nib 20 other than the slits 30 and 31 and the writing portion 40 and then performing laser processing or the like.

  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 having the following constitution and a pen tip conforming to FIGS. 1 to 5 and an ink for a writing instrument having the following composition were used. The size of the pen tip used was the size shown below.

(Structure of the pen tip 20)
Visible light transmittance 85% made of acrylic resin [manufactured by Suga Test Instruments Co., Ltd., reflectance was measured with a multi-light source spectrocolorimeter (MSC-5N) to obtain visible light transmittance. ]
Size of visual recognition part (window part) 25 (square): 6 mm x 6 mm x 7 mm x 6 mm
Slit width of the ink introduction slit portion 31: 30 μm, total length: 20 mm
Slit width of the slit body 32: 30 μm, width direction length: 6 mm, longitudinal direction length:
6 mm, area 0.4 cm ²
Air displacement parts 35, 35: groove depth 200 μm, width 200 mm, length 6 mm
A slit of the writing part (writing ridgeline) 40: slit width: 25 μm, length: 6 mm, and a minute slit of about 100 μm was formed on the tip surface of the writing part 40.

Ink storage material: PET fiber bundle, porosity 85%, φ6 × 77mm
Writing instrument body 10, caps 60, 70: made of polypropylene (PP) Pen tip 50: polyester fiber bundle core, porosity 60%, φ2.0 × 40.0 mm

(Ink composition for writing instruments: Ink color: Fluorescent yellow)
An ink having the following composition (total 100% by mass) was used as the ink for writing instruments.
Moisturizer: Trimethylglycine (glycine betaine) 7.5% by mass
Pentaerythritol 4.5% by mass
Coloring agent: NKW-4805 yellow (manufactured by Nippon Fluorescent Co., Ltd.) 40.0% by mass
Preservative: Bio Ace (Kai Kasei Co., Ltd.) 0.3% by mass
pH adjuster: triethanolamine 1.0% by mass
Fluorosurfactant: Surflon 8111N (manufactured by AGC Seimi Chemical Co.) 0.2 mass%
Water-soluble organic solvent: Ethylene glycol 3.0 mass%
Water (solvent): Ion-exchanged water 43.5% by mass
Viscosity (25 ° C): 3.0 mPa · s (complate type viscometer, TOKIMEC TV-20)
Surface tension (25 ° C.): 33 mN / m (Automatic surface tensiometer, Kyowa Interface Science Co., Ltd., DY-300)

  In the writing instrument A using the pen tip 20 of Example 1 according to FIGS. 1 to 5, since the tip end side of the slit portion 30 in the pen tip 20 is the writing portion 40, the inside of the slit portion 30 has a capillary force. Since it can be visually recognized through the ink passing therethrough by the entire visual recognition portion (window portion) 25, it has visibility (transparency) while ensuring a sufficient ink flow rate, ink outflow property, and the entire pen tip 20. It was confirmed that a writing instrument in which the effective area of the visual recognition portion 25 capable of visually recognizing the writing direction was maximized was obtained. Also, it was confirmed that writing was possible without falling even after dropping from a height of 1 mm.

  Further, this writing instrument was set in an automatic writing device, and a writing angle of 65 °, a writing load of 1 N, a speed of 7 cm / s, and a distance of 100 m were applied on a high-quality paper surface in accordance with the test method according to JIS S6037, and then the drawn line was drawn. When the state was visually confirmed, the ink flow rate (15 mg / m) of the pen tip 20 was good because the ink composition used had the above preferable ink composition, and the drying characteristics of the drawn line were suppressed while suppressing the drying of the pen tip. It was found that the ink has excellent low-temperature stability and exhibits a function without blurring or strike-through in the drawn line.

  INDUSTRIAL APPLICABILITY The nib of the present invention can be suitably applied as a nib used for a writing instrument of a type called an underline pen, a paint marker, an oil-based marker, or a water-based marker.

10 Writing Instrument Main Body 20 Pen Tip 30 Slit Section 35 Air Replacement Section 40 Writing Section

Claims (5)

  A writing instrument provided with a pen tip having a visible portion capable of guiding ink supplied from the writing instrument body and visually recognizing the writing direction, wherein the pen tip is formed of at least a transparent member, and A writing instrument characterized in that a slit portion having a capillary force for inducing ink is formed in the ink, an air displacement portion is provided separately from the slit portion, and the tip side of the slit portion serves as a writing portion.   The writing instrument according to claim 1, wherein the pen tip is composed of at least two parts.   The writing instrument according to claim 1 or 2, wherein the slit portion is formed by a protrusion provided on the surface of at least one plate member.   The writing instrument according to any one of claims 1 to 3, wherein the writing portion has a fine slit surface or a fine textured surface having a satin finish.   The writing instrument according to any one of claims 1 to 4, wherein the pen tip is visible through the ink passing through the slit portion.

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