JP2016141003A - Ball point pen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ball point pen that not only allows a variation in drawn line width but also has an excellent writing performance capable of smoothly varying the drawn line width without causing deterioration in a drawn line-drying property, smearing, or blurring.SOLUTION: The ball point pen is charged with ink, and capable of drawing different width lines, wherein the ink contains at least a polyvinyl alcohol and a boric acid compound.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a ballpoint pen that can change the width of a drawn line, and more particularly, to a ballpoint pen that has excellent writing performance in which the drawn line width can be smoothly changed without a reduction in drawn line dryness, bleeding, or blurring.

Conventionally, as a technique related to a ballpoint pen that can draw drawn lines having different thicknesses with one writing axis, for example, 1) The amount of ink flowing out is controlled by a pressurizing mechanism provided at the rear end portion in the shaft cylinder, and the drawn line is drawn. A ballpoint pen whose thickness and density are changed (see, for example, Patent Document 1), 2) The thickness and density of a drawn line are changed by a ballpoint pen having ballpoint pen tips with different ball diameters attached to both ends of the writing axis. A ballpoint pen (see, for example, Patent Document 2) is known.
In addition, as a technology related to a ballpoint pen that allows writing with different thicknesses at one writing tip, for example, a spring is provided inside the holder, and the writing ball is always pressed against the tip by the elasticity of the spring. In addition, a ballpoint pen (for example, Patent Document 3) is known in which lines having different thicknesses can be drawn according to the writing load. Moreover, a writing instrument (for example, Patent Document 4) in which a plurality of thin widths can be written by moving the marking surface part back and forth is also disclosed.

However, in the invention described in Patent Document 1, since the pressure mechanism is provided in the writing instrument, the structure is complicated, and it is troublesome to adjust the pressure of the pressure mechanism during writing, and excess ink flows out. There was a point. Moreover, in the invention described in the above-mentioned Patent Document 2, in addition to the annoyance that needs to reverse the writing axis, there are only two types of ballpoint pen tips, so that it is possible to simply draw a thick line and a thin line. Therefore, the thickness could not be adjusted.
Furthermore, in the invention described in Patent Document 3, the gap between the writing ball and the caulking portion of the holder changes, whereby the amount of ink outflow changes and the width and shading of the drawn line change. However, the range in which the writing ball can move within the holder is limited, and if the movable distance is increased, a large amount of ink will flow out, making it difficult to draw a good line. However, there was a problem that there was a limit.
In addition, in the invention described in Patent Document 4, it is difficult to obtain a smooth writing feeling because writing is performed on the surface of the component. In addition, when the pin that can be shifted is replaced with a ballpoint pen tip that has a writing ball in order to smooth the writing, the ink that flows out from the gap between the ballpoint tip does not reach the marking surface. It is difficult to write.
Accordingly, the present applicant has solved the above-described conventional problems and the like, and has a simple structure, and a ball-point pen that can write strokes with different thicknesses without special operation during writing (for example, Patent Document 5). And 6).

In the ballpoint pens described in Patent Documents 5 and 6, the fact that the drawn line width is variable means that the amount of ink flowing out changes. When the amount of ink flowing out is increased, the drawn line drying property is deteriorated, and the blurring and bleeding are likely to occur. Furthermore, when the outflow amount of ink decreases, blurring tends to occur. This is particularly noticeable when a Newtonian ink whose viscosity does not depend on the shear rate is used. In addition, the above-described characters become characters that are not beautiful unless the drawn line width changes smoothly.
On the other hand, the conventional ballpoint pen ink basically assumes that the amount of ink outflow does not change, but the ballpoint pen of the present invention has the characteristic that the stroke width can be varied as described above. At present, conventionally known inks cannot be applied as they are.

By the way, the present applicant has at least water and a colorant as a ball-point pen ink that can clearly write sharp and beautiful lines that are clear tomes, honey, and halves, and has a shear rate of 1-381 s. ^-1 discloses a ballpoint pen ink having a dilatant fluid characteristic (a state in which the viscosity increases as the shear rate increases) in at least a part of the region (at 25 ° C.) (for example, a patent) Reference 7).
This ink for ballpoint pens discloses the proximity technology of the ink used in the present invention, but the ink for ballpoint pens having this dilatant fluid characteristic is basically intended for ballpoint pens whose ink outflow does not change. Yes, even if it is applied to a ballpoint pen that can change the stroke width that changes the amount of ink flowing out, it does not show a decrease in stroke dryness, bleeding, or blurring, and it cannot demonstrate satisfactory writing performance. .

JP 2006-289833 A (Claims, drawings, etc.) No. 8-6551 (Utility Model Registration Request, Drawings, etc.) JP-A-8-187987 (claims, drawings, etc.) JP-T-2007-502729 (Claims, drawings, etc.) JP 2013-252654 A (Claims, drawings, etc.) JP 2013-252655 A (Claims, drawings, etc.) JP 2014-95070 A (Claims, Examples, etc.)

  The present invention intends to solve this problem in view of the above-described problems of the prior art, and even if it is a ballpoint pen whose stroke width can be changed, by using a suitable ink, An object of the present invention is to provide a ballpoint pen having excellent writing performance with no blurring and blurring and the stroke width can be changed smoothly.

  As a result of intensive studies in view of the above-described conventional problems, the inventors of the present invention are ballpoint pens equipped with ink, the ballpoint pens can write strokes with different thicknesses, and the ink has a specific composition. By using this ink, it was found that the above-mentioned ballpoint pen can be obtained, and the present invention has been completed.

That is, the present invention resides in the following (1) to (6).
(1) A ballpoint pen equipped with ink, wherein the ballpoint pen is capable of writing drawn lines having different thicknesses, and the ink contains at least polyvinyl alcohol and a boric acid compound.
(2) The degree of polymerization of the polyvinyl alcohol is 50 to 2000, and the ballpoint pen as described in (1) above.
(3) The ballpoint pen as described in (1) or (2) above, wherein the polyvinyl alcohol is a modified polyvinyl alcohol.
(4) The ballpoint pen is capable of writing strokes with different thicknesses at one writing tip, a writing ball, a holder for holding the writing ball by a crimped portion crimped at the tip, and ink on the holder An ink supply unit for supplying, a shaft cylinder for storing the ink supply unit therein, and an outer covering the outer periphery of the holder, and a holder for holding the writing ball and a part of the outer part at a tip of the shaft tube The ballpoint pen as described in any one of (1) to (3) above, wherein the writing ball and the outer tip end portion become a writing portion.
(5) The ballpoint pen is capable of writing strokes with different thicknesses depending on two writing parts, a writing ball and a first writing part that holds the writing ball by a crimped part with a crimped tip; An ink supply unit that supplies ink to the first writing unit; a shaft cylinder that houses the ink supply unit; and a second writing unit that covers an outer periphery of the first writing unit. Is a ballpoint pen in which a part of the first writing part and the second writing part that hold the part are exposed from the tip part of the shaft tube, and the second writing part and the first writing part Displacement means capable of relatively changing the positional relationship in the axial direction is provided, and the displacement means is configured such that the relative position between the second writing portion and the first writing portion is the first writing portion. The first writing section and the second writing brush. Ballpoint pen, according to any one of the preceding characterized in that it is formed so that the tip portion of the part to be able to simultaneously into contact with the writing surface (1) to (3).
(6) The displacement means is an elastic member disposed behind the first writing unit, and the relative position between the second writing unit and the first writing unit is set to the second writing unit. The immersion position of the first writing part that covers the portion until the tip part of the writing part reaches the crimped part of the writing ball, and the tip part of the second writing part is more than the immersion position of the first writing part. It can be displaced to the protruding position of the first writing section on the rear side, and the load from the tip direction is applied to the first writing section with the protruding position of the first writing section as the initial position. Thus, the elastic member is compressed and deformed, the first writing unit is moved rearward, and the first writing unit can be moved to the immersive position of the first writing unit. The ballpoint pen as described in (5) above, wherein

  ADVANTAGE OF THE INVENTION According to this invention, even if a drawn line width is variable, the ball-point pen which has the outstanding writing performance in which a drawn line width changes smoothly, without a drawn line drying fall, a blur, and a blurring is provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is 1st Embodiment of the ball-point pen of this invention, Comprising: It is drawing of the ball-point pen which can write the drawing line of different thickness with one writing tip, (A) is a front view, (B) is a longitudinal cross-sectional view. It is. It is a longitudinal cross-sectional view of the front-end | tip part of the ball-point pen of FIG. It is a longitudinal cross-sectional view of the writing tip of the ball-point pen of FIG. It is drawing which shows the state at the time of writing of the ball-point pen of FIG. 1, Comprising: (A) is the state which inclined the axis by a degree with respect to the writing surface, (B) inclines the axis by b degree with respect to the writing surface. It is each longitudinal cross-sectional view of the front-end | tip part of a ball-point pen of the state. FIG. 5 is a partially enlarged view of FIG. FIG. 5 is a partially enlarged view of FIG. It is 2nd Embodiment of the ball-point pen of this invention, Comprising: It is drawing of the ball-point pen which can write the drawing line of different thickness by two writing parts, (A) is a front view, (B) is a longitudinal cross-sectional view. It is. It is a longitudinal cross-sectional view of the front-end | tip part of the ball-point pen of FIG. It is drawing which shows the state at the time of writing of the ball-point pen of FIG. 7, Comprising: (A) is each normal view, (B) is each front view of the state which applied the writing load. FIG. 8 is an enlarged vertical cross-sectional view of a writing tip in a state where the holder of the ballpoint pen of FIG. 7 is immersed. FIG. 10 is an enlarged longitudinal sectional view of the writing tip of FIG. FIG. 10 is an enlarged vertical sectional view of the writing tip of FIG. It is drawing of the ball-point pen which concerns on 3rd Embodiment of the ball-point pen of this invention, Comprising: (A) is a front view, (B) is the front view which removed the cap of the ball-point pen and attached the cap to the rear axis | shaft, (C) is It is a longitudinal cross-sectional view of (A). It is drawing of the ball-point pen front side of FIG. 13, Comprising: (A) is an enlarged view, (B) is the whole figure of (A). It is explanatory drawing which shows an example of the drawn line of different thickness at the time of writing with the ball-point pen of this invention, for example, the ball-point pen of 1st Embodiment or 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Each embodiment of a ballpoint pen equipped with an ink of a specific composition that enables writing of different line thicknesses according to the present invention is described in the first embodiment (FIGS. 1 to 6) and the second embodiment (FIGS. 7 to 7). FIG. 12) and the third embodiment (FIGS. 13 and 14) will be described separately. In the present specification (FIGS. 1 to 14), “front” for the ballpoint pen 1 and its component parts means the front end side when the writing ball 30 is the front end of the ballpoint pen 1, and “rearward” means that The opposite side shall be said.

(First embodiment)
The ballpoint pen 1 according to the first embodiment is capable of writing strokes with different thicknesses at one writing tip, and as shown in FIGS. 1A and 1B, the writing ball 30 and the tip A ball-point pen tip 20 having a holder 21 for holding the writing ball 30 by a crimped caulking portion 23 (see FIG. 3), an ink supply portion 40 for supplying ink to the holder 21 of the ball-point pen tip 20, and an ink supply portion 40 The shaft cylinder 10 accommodated inside and the outer 50 which covers the outer periphery of the holder 21 are provided.

As shown in FIG. 1B, the shaft cylinder 10 includes a shaft main body 11 having an ink storage portion 13 and a tip shaft portion 12 provided at the tip of the shaft main body 11. 1 includes an ink supply unit 40 and a joint 14 that connects the ink supply unit 40 and the ballpoint pen tip 20. The ink container 13 is filled with ink (not shown), which will be described later.
The ink supply unit 40 includes a substantially cylindrical collector 41 having a plurality of fins formed on the outer periphery, and a tip holding unit 42 formed by reducing the diameter of the tip of the collector 41. Is in contact with the ink containing portion 13, and the tip holding portion 42 is fitted inside the front shaft portion 12.
Further, the rear end portion of the joint 14 is fitted inside the tip holding portion 42. In addition, a rod-like collector core 43 made of polyester fiber penetrates the collector 41 in the axial direction. The rear end side of the collector core 43 protrudes into the ink containing portion 13, and the front end side of the collector core 43 protrudes to the front end side from the front end holding portion 42 and is inserted into the joint 14 from the rear end portion. .

As shown in FIG. 2, the ball-point pen tip 20 includes a cylindrical holder 21 and a writing ball 30 held by the holder 21. A substantially conical tapered portion 22 that is tapered toward the distal end is formed on the distal end side of the holder 21, and a caulking portion 23 that is deformed by pressing the small end of the tapered portion 22 inward and deformed to a reduced diameter. Is formed. And the front-end | tip part of the writing ball 30 held by the ball house 24 (refer FIG. 3) formed inside the taper part 22 is exposed from the front-end edge of the crimping part 23. FIG.
The holder 21 can be formed by processing a pipe material made of metal such as stainless steel or resin such as polyacetal. In addition, a rod-shaped core 25 protruding from the rear end of the holder 21 is inserted into the holder 21. The middle core 25 is formed of polyester fiber in the same manner as the collector core 43, and its rear end is fitted into the front end of the collector core 43, and the front end reaches immediately after the writing ball 30, and the ink that has permeated the collector core 43. And the ink is supplied to the ball house 24. As shown in FIG. 2, the ball-point pen tip 20 is held by the joint 14 in a state in which about 2/3 from the rear end side is fitted into the tip of the joint 14.

The collector core 43 and the center core 25 are formed by selecting an appropriate porosity and surface shape of the polyester fiber according to properties such as the viscosity of the ink described later.
The outer 50 is a cylindrical body made of synthetic resin formed in a substantially conical shape. As shown in FIG. 2, the outer portion 50 has a tapered portion 54 that tapers toward the tip, and a tip portion of the tapered portion 54. Is an outer tip 51 that has been chamfered. The outer tip 51 may be a tapered tapered chamfer instead of the R chamfer. The rear insertion hole 52 formed on the rear side and the front insertion hole 53 having a smaller diameter than the rear insertion hole 52 communicating from the rear insertion hole 52 to the distal end side are provided. The holder 21 of the ball-point pen tip 20 protruding from the joint 14 is inserted into the front insertion hole 53. The outer 50 is fixed to the front end portion of the joint 14 in a state where the holder 21 is inserted into the front insertion hole 53 and the front end portion of the joint 14 is inserted into the rear insertion hole 52, and is exposed from the front shaft portion 12. The joint 14 and the holder 21 are covered.

Further, when the outer 50 is fixed to the joint 14, as shown in FIG. 3, the most distal end side of the outer distal end portion 51 (the distal end side edge portion of the front insertion hole 53) is the tapered portion 22 and the caulking portion of the holder 21. It is located up to a place slightly beyond the 23 boundary line. That is, the outer 50 covers the part reaching the crimping part 23 of the holder 21. As a result, as shown in FIGS. 1 and 2, about 2/3 of the distal end side of the outer 50, the crimped portion 23 of the holder 21, and a part of the writing ball 30 are exposed from the distal end of the front shaft portion 12. It will be. The outer may be fixed to the joint 14 or may be formed integrally with the front shaft portion 12.
Here, as shown in FIG. 3, the outer tip 51 of the outer 50 is located on the inner side (the writing ball 30 side) of the crimping portion 23 with respect to the tangent line L that contacts both the outer tip 51 and the writing ball 30. In order to do so, it is formed in a shape that bulges outside the caulking portion 23. In other words, the outer front end portion 51 is formed so that the caulking portion 23 does not protrude forward from the tangent line L.
Thus, when the writing ball 30 and the outer tip 51 are simultaneously brought into contact with the writing surface, the ink adhering to the surface of the writing ball 30 or the ball accompanying the rotation of the writing ball 30 The ink flowing out of the house 24 is diffused by capillary action into the space between the writing ball 30 and the writing surface contact portion and the space between the outer tip portion 51 and the writing surface contact portion. It is possible to draw a thicker line than when the part 51 is not brought into contact with the writing surface at the same time.

In the first embodiment, with the writing ball 30 and the outer tip 51 simultaneously in contact with the writing surface, the writing ball 30 and the contact portion of the writing surface, and the outer tip 51 and the contact portion of the writing surface A suitable ink is used for this embodiment that can diffuse in between.
The ink used for this type of ballpoint pen is characterized by containing at least polyvinyl alcohol and a boric acid compound. This ink does not have dilatant fluid characteristics as will be described later.

Polyvinyl alcohol (hereinafter simply abbreviated as “PVA”) that can be used in this ink is represented by the general formula: — [CH ₂ —CH (OH)] m— [CH ₂ —CH (OCOCH ₃ ] n—. The saponification degree {[m / (m + n)] × 100} is preferably 50 mol% or more, and more preferably, from the viewpoint of the stability over time of the ink and the viscosity imparting property. Is preferably 75 mol% or more.
In addition, in the saponification degree PVA, when the degree of polymerization is high, the viscosity tends to be obtained, and the ink characteristics of the present invention are exhibited (no reduction in drawn line dryness, blurring or blurring, and enhancement of beautiful character feeling). Therefore, the degree of polymerization (m + n) is preferably low, preferably 50 or more, more preferably 50 to 2000, and particularly preferably 50 to 1500.
Specific examples of PVA that can be used include commercially available A-type GOHSENOL series, G-type GOHSENOL series, and K-type GOHSENOL series (trade names manufactured by Nippon Synthetic Chemical Industry Co., Ltd.). ), Saponification degree from among the J Pobar series (trade name made by Nihon Vinegar & Poval), KURARAY Poval PVA series (product name made by Kuraray), etc. A suitable degree of polymerization is selected.
PVA which has these saponification degrees and polymerization degrees may be used individually by 1 type, and may use 2 or more types together.

Moreover, modified PVA, Preferably modified PVA which becomes the said polymerization degree range and a saponification degree can also be used for PVA to be used. As modified PVA that can be used, the hydroxyl group and acetic acid group of PVA are modified with a modifying group such as a carboxyl group, a sulfonic acid group, an acetyl group, and an ethylene oxide group, or the modified group is added to the side chain of PVA. The thing which has. A PVA / acrylic acid / methyl methacrylate copolymer obtained by copolymerizing partially saponified PVA with acrylic acid and methyl methacrylate can also be used as the modified PVA of the present invention.
Specific examples of modified PVA that can be used include the commercially available Gosennex L series manufactured by Nippon Synthetic Chemical Industry Co., Ltd., the Gosennex WO series (trade name manufactured by Nippon Synthetic Chemical Industry Co., Ltd.), and anion modified by Nihon Vineyard & Poval. A suitable saponification degree and polymerization degree are selected from PVA (A series) (trade name, manufactured by Nippon Vinegar Poval), Exeval 1713 (trade name, manufactured by Kuraray), etc. . As the PVA / acrylic acid / methyl methacrylate copolymer, a suitable one is selected from POVACOAT manufactured by Daido Kasei Kogyo Co., Ltd. (trade name manufactured by Daido Kasei Kogyo Co., Ltd.).
These modified PVA may be used individually by 1 type, and may use 2 or more types together.
The modified PVA does not directly affect the writing performance, but is effective for the temporal stability (viscosity) of the ink. In particular, carboxyl group-modified, sulfonic acid group-modified, and acetyl group-modified types are desirable because of their excellent stability.

  The total content of such PVA and modified PVA is appropriately adjusted according to the target ink viscosity value. For example, the content of PVA having a high degree of polymerization is small, and conversely, the content of PVA having a low degree of polymerization is high.

Examples of boric acid compounds to be used include boric acid, alkali metal salts of boric acid (lithium, sodium, potassium, rubidium), ammonium salts of boric acid, etc., for example, boric acid (H ₃ BO ₃ ), ditrioxide Boric acid (B ₂ O ₃ ), sodium metaborate (NaBO ₂ ), sodium diborate (Na ₄ B ₂ O ₅ ), sodium tetraborate (Na ₂ B ₄ O ₇ ), sodium pentaborate (NaB ₅ O ₈ ), sodium hexaborate (Na ₂ B ₆ O ₁₀ ), sodium octaborate (NaB ₈ O ₁₃ ), ammonium borate [(NH ₄ ) ₂ O · 5B ₂ O ₃ ], and their water Japanese products are listed. These may be used alone or in combination of two or more.
Preferably, it is desirable to use sodium tetraborate, ammonium borate, or diboric acid triborate from the viewpoint of solubility in ink components and versatility.
The total content of these boric acid compounds is appropriately adjusted according to the properties and content of the PVA so as to achieve the target ink viscosity value.

  The ink to be mounted on the ballpoint pen of the above form contains polyvinyl alcohol having the above characteristics and a boric acid compound in the above ranges of contents, and the remaining water is a solvent (tap water, purified water, distilled water, ion In addition to colorants, writing components, etc., commonly used for coloring agents, writing tools, for example, water-soluble organic solvents, viscosity modifiers other than the above PVA, dispersants, lubricants, rust inhibitors, antiseptics An agent, antibacterial agent, pH adjuster, and the like can be appropriately contained as long as the effects of the present invention are not impaired.

Colorants that can be used include acidic dyes that are dissolved or dispersed in water, direct dyes, basic dyes, conventionally known inorganic and organic pigments such as titanium oxide, resin particle pigments containing pigments, and resin emulsions. Pseudo-pigments colored with dyes, white plastic pigments, pigments with a surface layer of silica or mica and iron oxide, titanium oxide, etc. can be used as long as the effects of the present invention are not impaired. These color materials can be used alone or in admixture of two or more.
The content of these coloring materials can be appropriately adjusted within a range of 0.1 to 40% with respect to the total amount of ink.

Examples of water-soluble organic solvents that can be used include glycols such as ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, polyethylene glycol, 3-butylene glycol, thiodiethylene glycol, and glycerin, ethylene glycol monomethyl ether, and diethylene glycol monomethyl. Examples include glycol ethers such as ether, and these can be used alone or in admixture of two or more.
The content of these water-soluble organic solvents is preferably 3 to 30% with respect to the total amount of the water-based ink composition for writing instruments.

In order to produce this ink, a conventionally known method can be employed. For example, polyvinyl alcohol having the above characteristics, boric acid compound at least, and a predetermined amount of each component in water are blended, Alternatively, it can be obtained by stirring and mixing with a stirrer such as a disper. Further, if necessary, coarse particles in the ink composition may be removed by filtration or centrifugation, and may be prepared while defoaming, heating and cooling.
The ink having this composition is suitable for the ink of the ballpoint pen according to the first embodiment, in which drawn lines having different thicknesses can be written. This ink does not have dilatant fluid properties as will be described later by suitably combining the above-mentioned properties of polyvinyl alcohol species, boric acid compound species, each content, and the like.
The ink viscosity to be used is preferably at a temperature of 25 ° C. under a rotational speed of 100 rpm (383 s ⁻¹ ) measured by an E-type rotational viscometer (VISCOMETER RE215, manufactured by Toki Sangyo Co., Ltd., cone: 1 ° 34 ′ * R24). 2 to 15 mPa · s, more preferably 2 to 10 mPa · s, and particularly preferably 3 to 5 mPa · s. When the ink viscosity exceeds 15 mPa · s, the following performance may be deteriorated in the ballpoint pen, whereas when the ink viscosity is less than 2 mPa · s, the drawn line may be blurred.

A method of using the ballpoint pen 1 according to the first embodiment having the above-described configuration in which the ink having the above composition is mounted will be described with reference to FIGS.
As shown in FIG. 4A, when the ballpoint pen 1 is tilted so that the angle of the tapered portion 54 of the outer 50 with respect to the writing surface is a °, only the writing ball 30 is shown as shown in FIG. Can be in contact with the writing surface. When writing with the ballpoint pen 1 tilted at such an angle, a line of width w1 can be drawn by the ink having the above composition attached to the surface of the writing ball 30.

On the other hand, as shown in FIG. 4B, when the ballpoint pen 1 is inclined such that the angle of the tapered portion 54 of the outer 50 with respect to the writing surface is b ° smaller than the a °, as shown in FIG. In addition, the writing ball 30 and the outer tip 51 can be simultaneously brought into contact with the writing surface. In this state, the ink having the above composition adhering to the surface of the writing ball 30 diffuses to the writing surface due to the capillary phenomenon and adheres to the outer tip 51, and the writing ball 30, the writing surface, the outer tip 51, and the caulking The ink having the above composition stays in the space surrounded by the portion 23.
And when writing in such a state, the ink of the said composition flows into the above-mentioned space part with rotation of the writing ball 30, the contact part of the writing ball 30, the writing surface, the outer front-end | tip part 51, and a writing surface. A line having a width w2 larger than the width w1 can be drawn by the ink having the above composition diffusing between the contact portions. In this case, since the positional relationship between the writing ball 30 and the caulking portion 23 is maintained, the amount of ink that flows out with the rotation of the writing ball 30 can be kept constant, and ink having the above composition leaks. Nor. Further, the change in the contact portion with the writing surface can be the same not only in the angle but also in the contact state of the tip portion with the paper surface.
For example, if the writing is made with a light load with multiple papers stacked, only the writing ball will contact the writing surface, so a line of width w1 can be written, and if the writing is made with a strong load, the writing ball And the outer tip can be simultaneously brought into contact with the writing surface, so that a line having a width w2 that is significantly thicker than the width w1 can be written.

As described above, since the ballpoint pen 1 according to the first embodiment has the above-described structure, it is possible to write strokes with different thicknesses at one writing tip, and the angle with respect to the writing surface when writing or Only by changing the contact state between the writing part and the paper surface, that is, when drawing a thin line (thin line part), as shown in FIG. In the case of drawing a thick line (thick line portion), as shown in FIG. 4B, it is easy to simply draw the shaft tube 10 in an inclined state (laying down state) compared to drawing a thin line. The thickness of the drawn line can be changed, and by using the ink of the above characteristics, there is no deterioration or blurring of the drawn line even when drawing a thick drawn line. Brush with excellent continuity (smoothness) from thin to fine lines The ones that can demonstrate the performance.
Even if the ball diameter of the writing ball 30 is different by adjusting the shape of the outer tip 51 of the outer 50 (the protruding dimension to the front or the protruding dimension to the side), the writing ball 30 and the outer The line width when the tip portion 51 simultaneously contacts the writing surface can be made the same size.

(Second Embodiment)
7 to 12 show a second embodiment of the present invention. In the second embodiment, the same reference numerals as those used in the first embodiment are used for the same constituent elements as those in the first embodiment. The same applies to the following third embodiment.
The ball-point pen 1 according to the present embodiment can be drawn with different thicknesses depending on the two writing parts. As shown in FIGS. 7A and 7B, the writing ball 30 and the tip are caulked. A ballpoint pen tip 20 having a holder 21 as a first writing portion for holding the writing ball 30 by a crimping portion 23 (see FIGS. 10 and 11), and an ink supply portion for supplying ink to the holder 21 of the ballpoint pen tip 20 40, the axial cylinder 10 that houses the ink supply unit 40, the outer 50 that is the second writing unit that covers the outer periphery of the holder 21, and the relative position in the axial direction of the outer 50 and the holder 21 are changed. Displacement means 60a. Moreover, although not shown in figure, the cap which can be attached or detached at the front-end | tip and rear end of the axial cylinder 10 is also provided.

As shown in FIG. 7B, the shaft cylinder 10 includes a shaft main body 11 having an ink storage portion 13 and a tip shaft portion 12 provided at the tip of the shaft main body 11. 1 includes an ink supply unit 40 and a joint 14 that connects the ink supply unit 40 and the ballpoint pen tip 20. The ink container 13 is filled with ink having the composition used in the first embodiment.
The ink supply unit 40 includes a substantially cylindrical collector 41 having a plurality of fins formed on the outer periphery, and a tip holding unit 42 formed by reducing the diameter of the tip of the collector 41. Is in contact with the ink containing portion 13, and the tip holding portion 42 is fitted inside the front shaft portion 12. Further, the rear end portion of the joint 14 is fitted inside the tip holding portion 42. In addition, a rod-like collector core 43 made of polyester fiber penetrates the collector 41 in the axial direction. The rear end side of the collector core 43 protrudes into the ink containing portion 13, and the front end side of the collector core 43 protrudes further toward the front end side than the front end holding portion 42 and is fitted into the joint 14 from the rear end portion of the joint 14. It has been. The joint 14 is formed integrally with the collector core 43 so as to be slidable in the axial direction inside the tip holding portion 42.

As shown in FIG. 8, the ball-point pen tip 20 includes a cylindrical holder 21 and a writing ball 30 held by the holder 21. A tapered portion 22 having a substantially conical shape that tapers toward the tip is formed on the tip side of the holder 21, and a crimping portion 23 (diameter-reduced and deformed by pressing the small end of the taper portion 22 inwardly). 10) is formed. The tip of the writing ball 30 held by the ball house 24 formed inside the tapered portion 22 is exposed from the tip edge of the crimping portion 23.
The holder 21 can be formed by processing a pipe material made of metal such as stainless steel or resin such as polyacetal. In addition, a rod-shaped core 25 protruding from the rear end of the holder 21 is inserted into the holder 21. The middle core 25 is formed of polyester fiber in the same manner as the collector core 43, and its rear end is fitted into the front end portion of the collector core 43, and the front end reaches immediately after the writing ball 30, and the infiltrated into the collector core 43. The ink is absorbed and supplied to the ball house 24. As shown in FIG. 8, the ball-point pen tip 20 is held by the joint 14 in a state in which approximately 2/3 from the rear end side is fitted into the distal end portion 14 </ b> A of the joint 14.

The collector core 43 and the center core 25 are formed by selecting an appropriate porosity and surface shape of the polyester fiber according to the properties such as the viscosity of the ink having the above composition to be used. In the present embodiment, the ink is stored in the shaft cylinder 10 and the ink is supplied to the ballpoint pen tip 20 by the ink supply unit 40. An ink refill formed by press-fitting the ballpoint pen tip 20 may be provided at the tip of the ink containing tube containing the ink.
The outer 50 is a cylindrical body made of synthetic resin formed in a substantially conical shape. As shown in FIG. 8, the outer portion 50 is formed with a tapered portion 54 that tapers toward the distal end, and a distal end portion of the tapered portion 54. Is an outer tip 51 that has been chamfered. The outer tip 51 may be a tapered tapered chamfer instead of the R chamfer. The rear insertion hole 52 formed on the rear side and the front insertion hole 53 having a smaller diameter than the rear insertion hole 52 communicating from the rear insertion hole 52 to the distal end side are provided. 14A is inserted, and the holder 21 of the ball-point pen tip 20 exposed from the joint 14 is inserted into the front insertion hole 53. The tip end portion 14A of the joint 14 can slide in the axial direction in the rear insertion hole 52, and the holder 21 can slide in the front insertion hole 53 in the axial direction.

  The outer 50 is inserted from the front end side of the joint 14 and the holder 21 protruding from the front end of the front shaft portion 12 and fixed to the front shaft portion 12. In a state where the outer 50 is fixed to the front shaft portion 12, the holder 21 is inserted into the front insertion hole 53, and the distal end portion 14 </ b> A of the joint 14 is inserted into the rear insertion hole 52. Further, in this state, as shown in FIG. 9A, the most distal end side of the outer distal end portion 51 is located behind the caulking portion 23 of the holder 21, and the outer end portion of the front shaft portion 12 is 50, the taper part 22 and the crimping part 23 of the holder 21, and the writing ball 30 are exposed. Such a positional relationship between the outer 50 and the holder 21 is referred to as a holder protruding position as a protruding position of the first writing part. In the ballpoint pen 1 in the present embodiment, the holder protruding position is the initial position.

As shown in FIG. 8, the displacing means 60 a is an elastic member arranged at the tip of the tip holding portion 42 of the ink supply unit 40. The elastic member according to the present embodiment is an O-ring 61a made of silicon resin or the like, and is fitted into the tip holding portion 42 with the joint 14 being fitted from the rear end portion of the joint 14, so that the tip holding portion 42 is inserted. Is sandwiched between a conical recess 42A formed at the tip of the flange 14B and a flange 14B formed around the joint 14.
The O-ring 61a is compressed and deformed by receiving an axial load, and the relative position in the axial direction between the outer 50 and the holder 21 is accompanied by the positional movement of the joint 14 and the ballpoint pen tip 20 held by the joint 14. Is changing. Specifically, when a load is applied from the tip of the writing ball 30, a backward force is applied to the joint 14, and the O-ring 61a is pressed against the flange portion 14B and pressed against the receiving portion 42A to be crushed. The ball-point pen tip 20 moves rearward with respect to the outer 50, the front shaft portion 12, and the tip holding portion 42. When the joint 14 and the ball-point pen tip 20 are moved most rearward, as shown in FIG. 9B, the most distal end side of the outer distal end portion 51 slightly exceeds the boundary line between the tapered portion 22 and the caulking portion 23 of the holder 21. It comes to be located to the place.
As a result, approximately 2/3 of the tip end side of the outer 50, the crimping portion 23 of the holder 21, and a part of the writing ball 30 are exposed from the tip end of the front shaft portion 12. Such a positional relationship between the outer 50 and the holder 21 is referred to as a holder immersion position as an immersion position of the first writing unit. When the load applied to the writing ball 30 disappears, the O-ring 61a is elastically deformed and returns to its original shape, and the joint 14 and the ballpoint pen tip 20 move to the holder protruding position and return to the initial state.

Here, at the holder immersion position, as shown in FIG. 10, the caulking portion 23 is located on the inner side (the writing ball 30 side) with respect to the tangent line L in contact with both the outer tip 51 and the writing ball 30. . That is, the outer front end portion 51 bulges outside the caulking portion 23 so that the outer front end portion 51, the writing ball 30 and the caulking portion 23 can be in the positional relationship as described above at the holder immersion position. It is formed in the shape.
Thus, when the writing ball 30 and the outer tip 51 are simultaneously brought into contact with the writing surface, the ink adhering to the surface of the writing ball 30 or the ball accompanying the rotation of the writing ball 30 The ink flowing out of the house 24 is diffused by capillary action in the space between the writing ball 30 and the writing surface contact portion and the space between the outer tip portion 51 and the writing surface contact portion, and the writing ball 30 and the outer tip portion. It is possible to draw a thicker line than when 51 is not brought into contact with the writing surface at the same time.

  In the present embodiment, the writing ball 30 and the outer tip 51 are in contact with the writing surface at the same time, and the contact between the writing ball 30 and the writing surface, and between the outer tip 51 and the contact portion of the writing surface. A diffusible ink having the composition used in the first embodiment is used. By using such ink, even when a thick drawn line is drawn, it is not faded.

A method of using the ballpoint pen 1 according to the second embodiment having the above-described configuration in which the ink having the same composition as that of the first embodiment is mounted will be described with reference to FIGS. 9, 11, and 12.
As shown in FIG. 9A, when the outer 50 and the ballpoint pen tip 20 are in the initial position, that is, when the positional relationship between the outer 50 and the ballpoint pen tip 20 is the holder protruding position, When the writing ball 30 is brought into contact with the writing surface at a predetermined angle, the outer tip 51 is located behind the crimping portion 23 and behind the tangent line that contacts both the writing ball 30 and the crimping portion 23. Therefore, only the writing ball 30 can be brought into contact with the writing surface. At the holder protruding position, the length from the tip of the outer tip 51 to the tip of the writing ball 30 is a. When writing in this state, as shown in FIG. 11, a line having a width w <b> 1 can be drawn by the ink attached to the surface of the writing ball 30.

  On the other hand, in the state of FIG. 9A, if the writing load is increased without changing the inclination angle of the barrel 10 (the writing ball 30 is pressed against the writing surface), the load is applied to the holder 21 from the tip direction. As shown in FIG. 9 (B), the ball-point pen tip 20 and the joint 14 are pushed rearward to become the holder immersion position. At this time, the length from the tip of the outer tip 51 to the tip of the writing ball 30 is a length b shorter than the length a in the case of the holder protruding position, and the writing ball 30 and the outer tip 51 are simultaneously written on the writing surface. To touch. In this state, the ink of the above composition adhering to the surface of the writing ball 30 diffuses to the writing surface by the capillary phenomenon and adheres to the outer tip 51, and as shown in FIG. 12, the writing ball 30 and the writing surface Ink of the above composition stays in the space surrounded by the outer tip 51 and the caulking portion 23. And when writing in such a state, the ink of the said composition flows into the above-mentioned space part with rotation of the writing ball 30, the contact part of the writing ball 30, the writing surface, the outer front-end | tip part 51, and a writing surface. A line having a width w2 larger than the width w1 can be drawn with the ink having the above composition that diffuses between the contact portions by capillary action. In this case, since the positional relationship between the writing ball 30 and the caulking portion 23 is maintained, the amount of ink that flows out with the rotation of the writing ball 30 can be kept constant, and ink having the above composition leaks. Nor.

If the writing load is weakened in the state of FIG. 9B, the positional relationship between the outer 50 and the ballpoint pen tip 20 returns to the holder protruding position. Further, in the state of FIG. 9 (B), if the shaft cylinder 10 is set in a state of being substantially perpendicular to the writing surface, it is needless to say that only the writing ball 30 contacts the writing surface, so that a thick line cannot be drawn. Yes.
As described above, since the ballpoint pen 1 according to the second embodiment has the above-described structure and is equipped with the ink having the above-described composition, it is possible to write a drawn line having a different thickness depending on two writing parts. Yes, the thickness of the drawing line can be changed simply by changing the writing load when writing. That is, when a thin line (thin line portion) is drawn, the writing load is such that the ball-point pen tip 20 does not immerse, and when a thick line (thick line portion) is drawn, the writing load is high enough to immerse the ball-point pen tip 20. do it. In the present embodiment, since the thickness of the drawing line can be changed by the writing load, the line width and the line shading can be easily changed during the writing, and the above-mentioned characteristics can be obtained. By using ink, even when drawing thick lines, there is no deterioration or blurring of drawn lines. Also, when drawing thin lines, there is no blur and excellent continuity (smoothness) from thick lines to thin lines. It is suitable for use in painting and ballpoint penmanship.

Further, even if the ball diameter of the writing ball 30 is different by adjusting the shape of the outer tip 51 of the outer 50 (protruding dimension to the front or protruding dimension to the side), the writing ball 30 and the outer The line width when the tip portion 51 simultaneously contacts the writing surface can be made the same size.
The elastic member is not limited to the O-ring 61a, and a spring may be used. In the above-described embodiment, the joint 14 and the ball-point pen tip 20 are formed so as to move integrally, but only the ball-point pen tip 20 may be formed to move.

(Third embodiment)
The ballpoint pen of the third embodiment is different from the ballpoint pen of the second embodiment (FIGS. 7 to 12) in that the displacement means 61a (60a) of FIG. 8 includes another form, specifically an intervening member 14d. It is different in the shape of the joint 14 and the like, and the other is a structure in which the thickness of the drawn line can be changed only by changing the writing load when writing in the same manner as in the second embodiment. is there.
As shown in FIGS. 13A, 13B, and 13C and FIGS. 14A and 14B, the ballpoint pen 1 of the present embodiment includes a ballpoint pen tip 20 that holds a writing ball 30 at the tip. An ink supply unit 40 that supplies ink to the ball-point pen chip 20, a joint 14 that connects the ball-point pen chip 20 and the ink supply unit 40, and a shaft cylinder 10 that houses the ball-point pen chip 20, the joint 14 and the ink supply unit 40 therein. And an outer 50 that is attached to the tip of the shaft cylinder 10 and covers the outer periphery of the ball-point pen tip 20. A cap 80 having an inner cap 71 that prevents volatilization of ink from the clip 70 and the ballpoint pen tip 20 is attached to the shaft cylinder 10.

As shown in FIG. 13C, the shaft cylinder 10 has a cylindrical ink tank 13 whose rear end is closed, a cylindrical ink tank 13, and a cylindrical shape with a tapered tip. The front shaft 12 in which the front end of the ink containing portion 13 is fitted in the inner periphery and the cylindrical main body in which the rear end is closed, and the shaft main body in which the rear end of the front shaft 12 is inserted in the inner periphery of the front end. It consists of a rear shaft 11.
The outer diameter of the ink containing portion 13 is substantially the same as the inner diameter of the rear end of the front shaft 12 as shown in FIG. On the outer periphery of the ink storage portion 13, an ink tank outward projection that protrudes outward is provided at a position about 1/3 from the tip of the ink storage portion 13. In addition, the ink container 13 is filled with ink (not shown) having the composition used in the first embodiment.

  As shown in FIG. 13C, the front shaft 12 has a substantially cylindrical shape, and the tip has a tapered shape. On the outer periphery of the front shaft 12, a front shaft collar portion with an outer diameter approximately the same as the outer diameter of the rear shaft 11 and the tip of the rear shaft 11 abuts at a position about 約 from the rear end of the front shaft 12. 12a is provided. The front shaft 12 includes a rear shaft rear portion 12b having a substantially cylindrical shape at the front shaft flange portion 12a and a front shaft front portion 12c having a tapered shape on the front side. On the inner periphery of the front shaft rear portion 12 b, a front shaft inward protrusion that protrudes inward is provided immediately after the ink tank outer protrusion when the ink storage portion 13 is fitted into the front shaft 12. On the outer periphery of the front shaft rear portion 12b, a plurality of front shaft outer protrusions protruding outward are provided in front of the front shaft inner protrusion.

Further, in front of the front shaft front portion 12c, a front shaft front diameter-reduced hole that is reduced in diameter so that the tip of the joint 14 can be inserted, and an outer that is connected in front of the front shaft front portion reduced diameter hole. An outer insertion hole into which 50 is inserted is provided. On the outer periphery in the vicinity of the front end of the front shaft front portion 12c, a groove is provided so that other members can be attached, and a grip member 16 is provided so as to prevent slippage.
As shown in FIG. 13C, the inner diameter of the rear shaft 11 is substantially the same as the outer diameter of the front shaft rear portion 12b. On the inner periphery of the rear shaft 11, a rear shaft taper portion formed so that the diameter is slightly reduced at a position that covers the rear end of the front shaft 12 when the front shaft 12 is fitted into the rear shaft 11, and A rear shaft inward projection protruding inward is provided.

The ink supply unit 40 includes a collector 41 having a substantially cylindrical shape and a plurality of fins formed in a comb-like shape on the outer periphery, and a rod-like polyester fiber. The ink supply unit 40 penetrates the collector 41 in the axial direction and has a ballpoint pen tip at the tip. 20 and a collector core 43 into which the rear end is fitted. As shown in FIG. 14A, the tip of the collector 41 is provided with a tip holding portion 42 having an enlarged inner diameter.
A ring-shaped collector provided on the outer periphery of the tip holding portion 42 engages with a front shaft front inner projection 12d formed on the inner periphery of the front shaft front portion 12c, and is provided immediately before the front shaft front inner projection 12d. The flange 42a is connected to the front of the collector flange 42a, the collector step 42b having a diameter smaller than that of the collector flange 42a, and the front of the collector step 42b, and has a diameter larger than that of the collector step 42b. A small collector contact portion 42c is provided.
The front end of the collector core 43 is inserted from a position about 1/3 from the front end of the joint 14, and the rear end is disposed in the ink containing portion 13.

As shown in FIG. 14A, the ball-point pen tip 20 includes a cylindrical holder 21, a rod-shaped core 25 that is inserted into the holder 21 and protrudes from the rear end of the holder 21, and a writing held by the holder 21. A ball 30. At the tip of the holder 21 is formed a crimping portion 23 that is deformed by reducing the diameter by pressing the fore inward. The tip of the writing ball 30 is exposed from the tip edge of the crimping portion 23. The core 25 is formed of polyester fiber in the same manner as the collector core 43, the rear end of the core 25 is fitted into the tip of the collector core 43, and the tip of the core 25 reaches immediately after the writing ball 30. The ink penetrating the core 43 is absorbed and the writing ball 30 is supplied with the ink having the composition used in the first embodiment. Further, about 2/3 of the ball-point pen tip 20 is held by the joint 14 from the rear end.
The collector core 43 and the center core 25 are formed by selecting an appropriate porosity and surface shape of the polyester fiber according to the properties such as the viscosity of the ink having the composition used in the first embodiment to be used. The

As shown in FIG. 14 (A), the joint 14 has a substantially cylindrical center member 14a and a gap 14b corresponding to the thickness of the tip holding portion 42 of the collector 41 on the outer periphery behind the center member 14a. A substantially cylindrical peripheral member 14c formed from about ¼ to about ３ from the rear end of the central member 14a, and from the front end of the peripheral member 14c to a position about 1/3 from the front end of the central member 14a. 14d formed so as to cover.
The collector core 43 is inserted into the center member 14a from the rear, and the ballpoint pen tip 20 is inserted from the front. In addition, the tip holding portion 42 is fitted into a gap portion 14b formed between the center member 14a and the peripheral member 14c.

  The joint 14 is a part molded by two-color molding, and the central member 14a and the peripheral member 14c are molded by primary molding, and the interposition member 14d is integrally molded by secondary molding with respect to the central member 14a and the peripheral member 14c. doing. Further, the interposition member 14d is formed of an elastic resin material in order to bend at the connecting portion 14e. As the elastic material, a thermoplastic elastomer is desirable because it is performed at a high temperature using a mold in the molding process. The material of the central member 14a and the peripheral member 14c, which are primary molded bodies, is preferably a hard resin such as polyacetal resin.

  As shown in FIG. 14A, the outer 50 includes a cylindrical outer fixing portion 55 and a substantially conical outer taper portion 54 provided continuously to the outer fixing portion 55. A chamfered outer tip 51 is provided at the tip of the outer tapered portion 54. Further, a hole is formed in the outer 50 from the rear end to the front end, a rear insertion hole 52 is provided on the inner surface of the outer fixing portion 55, and an inner surface in the vicinity of the front end of the outer tapered portion 54 is provided on the inner surface. A front insertion hole 53 having a smaller diameter than the rear insertion hole 52 is provided. The outer fixing portion 55 is fixed to the front shaft 12 by being attached to the outer insertion hole 12d. The outer 50 covers the ballpoint pen tip 20. At this time, the joint 14 is inserted into the rear insertion hole 52, and the ball-point pen tip 20 protruding from the joint 14 is inserted into the front insertion hole 53. As shown in FIG. 14A, the outer tip 51 has the writing ball 30 and the crimping portion 23 covering the writing ball 30 exposed from the front.

  The ballpoint pen 1 configured in this way is assembled as follows. First, the tip holding part 42 of the collector 41 is fitted into the gap 14b of the joint 14, and the collector core 43 is inserted from the rear end of the collector 41 and the ball-point pen tip 20 holding the writing ball 30 from the tip of the joint 14 is inserted. Then, the middle core 25 of the ballpoint pen tip 20 is fitted into the collector core 43. The combined collector 41, collector core 43, joint 14 and ballpoint pen tip 20 are inserted from the rear end of the front shaft 12. Thereafter, the outer 50 is attached to the inner periphery of the tip shaft 12 so as to cover the ballpoint pen tip 20. Alternatively, after the outer 50 is mounted on the inner periphery of the front shaft 12, the combined collector 41, collector core 43, joint 14, and ballpoint pen tip 20 may be inserted from the rear end of the front shaft 12 and assembled.

Next, the rear end of the front shaft 12 is placed on the outer periphery of the ink containing portion 13 filled with the ink of the composition used in the first embodiment until the front end of the ink containing portion 13 contacts the rear end of the collector 41. Extrapolate.
Finally, the rear end of the front shaft 12 is inserted into the inner periphery of the front end of the rear shaft 11 so as to cover the ink containing portion 13. When the front shaft 12 is inserted into the rear shaft 11, the front shaft 12 is inserted until the tip of the rear shaft 11 comes into contact with the front shaft collar 12a. The front shaft 12, the rear shaft 11, and the ink storage portion 13 are fitted in such a manner that the front shaft 12 has a thread shape and is fixed to the rear shaft 11 by screwing.

  As described above, the ballpoint pen 1 according to the third embodiment is different from the ballpoint pen of the second embodiment (FIGS. 7 to 12) in that the displacement means 61a (60a) in FIG. As shown in FIGS. 13 and 14, this is different in that the shape of the joint 14 including the interposition member 14 d is used, and the other changes the writing load when writing in the same manner as the ballpoint pen of the second embodiment. With this structure, it is possible to change the thickness of the drawing line, so it is possible to write different thicknesses between the two writing parts, and the drawing line can be changed simply by changing the writing load. The thickness of can be changed. That is, when a thin line (thin line portion) is drawn, the writing load is such that the ball-point pen tip 20 does not immerse, and when a thick line (thick line portion) is drawn, the writing load is high enough to immerse the ball-point pen tip 20. do it. In the present embodiment, since the thickness of the drawing line can be changed by the writing load, the line width and the line shading can be easily changed during the writing, and the above-mentioned characteristics can be obtained. By using ink, even when drawing thick lines, there is no deterioration or blurring of drawn lines. Also, when drawing thin lines, there is no blur and excellent continuity (smoothness) from thick lines to thin lines. It is suitable for use in paintings and ballpoint penmanship.

The ballpoint pen of the present invention is not limited to the above embodiment, and can be variously modified within the scope of the technical idea of the present invention.
When the difference between the ballpoint pen of the present invention and the conventional ballpoint pen is further described in detail, in the conventional ballpoint pen, for example, when the ball diameter is 0.7 mm, the maximum line width is usually about 0.5 mm. On the other hand, in the ballpoint pen of the present invention capable of writing drawn lines having different thicknesses including the first to third embodiments, for example, when the ball diameter is φ0.7 mm, the maximum drawn line width is the writing angle. Or about 0.8 mm larger than the diameter of the ball by the writing load. Therefore, the drawn line can be adjusted according to the user's preference. In addition, as shown in FIG. 15, the character “U”, which is a drawn line having a different thickness, can be easily written (suitable for calligraphy).

  EXAMPLES Next, although an Example and a comparative example demonstrate this invention further in detail, this invention is not limited to the following Example etc.

[Examples 1 to 5 and Comparative Examples 1 to 3]
According to the formulation shown in Table 1 below, each ink (composition) used for a ballpoint pen having the following constitution was prepared by a conventional method. The viscosity (initial, 50 ° C., after storage for 3 months) of each ink obtained was measured by the following method. Moreover, the presence or absence of the dilatant fluid characteristic was confirmed about the ink of Example 1 among the inks of Examples 1-5.
About each obtained ink (composition, 100 mass% of total quantity), it mounts in the ball-point pen of the following structure, and the following evaluation method WHEREIN: The drawn line dryness of a thick line part, the blur of a thick line part, the blur of a fine line part, a fine line part The continuity from to the thick line portion was evaluated.
Table 1 below shows the formulation of the inks of Examples 1 to 5 and Comparative Examples 1 to 3 and the evaluation results of the ballpoint pens. Table 2 below shows the results of the presence or absence of dilatant fluid characteristics.

(Measurement of ink viscosity, etc.)
At a temperature of 25 ° C., an initial (immediately after production), 50 conditions under a rotational speed of 100 rpm (383 s ⁻¹ ) using an E-type rotational viscometer (VISCOMETER RE215, manufactured by Toki Sangyo Co., Ltd., cone: 1 ° 34 ′ * R24) The viscosity of each ink after storage at 3 ° C. for 3 months was measured.
Also, the presence or absence of dilatant fluid characteristics is confirmed by using an E-type rotational viscometer [VISCOMETER RE215 (manufactured by Toki Sangyo Co., Ltd.)], cone: 1 ° 34 ′ * R24, measurement mode: slope measurement, start rotational speed: The ink viscosity (mPa · s) at each shear rate was measured at 0 rpm, top rotation speed: 100 rpm (383 s ⁻¹ ), rising time setting: 56 sec, measurement temperature: 25 ° C.

(Used ballpoint pen)
Water-based ballpoint pen with a configuration based on FIGS.
Ballpoint pen tip: Cemented carbide ball, ball diameter 0.7mm

(Evaluation method of drawn line dryness in thick line part)
Using the above water-based ballpoint pens, write “U” as shown in FIG. 15 freehand on the writing test paper. After a certain period of time, scrape the wide stroke area with your thumb, and check if there are ink transfer marks on your fingers. It was confirmed and evaluated according to the following criteria.
Evaluation criteria:
○: No transfer mark remains even if it is rubbed after 3 seconds of writing.
Δ: No transfer marks remain after 4 to 5 seconds of writing.
X: Transfer marks do not remain unless writing exceeds 5 seconds.

(Evaluation method of bleeding in thick line part)
Using the above water-based ballpoint pens, “U” shown in FIG. 15 was written freehand on the writing test paper, and the bleeding state in the thick line portion was visually evaluated according to the following criteria.
Evaluation criteria:
○: No bleeding is observed.
Δ: Slight bleeding is observed.
X: Bleeding is conspicuous.

(Evaluation method for blur in the thin line part)
Using the above water-based ballpoint pens, “U” shown in FIG. 15 was written freehand on the writing test paper, and the state of blurring in the thin line portion was visually evaluated according to the following criteria.
Evaluation criteria:
○: Scratch is not recognized.
Δ: Scratch is slightly recognized.
X: Scratch is conspicuous.

[Evaluation method of continuity (smoothness) when changing from thin line part to thick line part]
Using the above water-based ballpoint pens, “U” shown in FIG. 15 was written freehand on the writing test paper, and the state from the thin line portion to the thick line portion was visually evaluated according to the following criteria.
Evaluation criteria:
○: The drawn line changes continuously.
(Triangle | delta): A defect | deletion is recognized by a part of drawn line.
X: The part by which a drawn line width changes discontinuously is recognized.

Considering Table 1 above, the ball-point pen using the inks of Examples 1 to 5 that are within the scope of the present invention (based on FIGS. 1 to 6) has a drawn line dryness at the thick line part even if the drawn line width is variable. It was found that continuity from the thin line part to the thick line part can be smoothly written without deterioration of the image, blurring of the thick line part, and blurring of the fine line part.
In contrast, Comparative Example 1 uses an ink having a composition not containing polyvinyl alcohol and a boric acid compound, Comparative Example 2 uses an ink containing only PVA, and Comparative Example 3 uses a polymer other than PVA (polyvinyl chloride). This is the case of inks having a composition imparted with viscosity by alcohol), and it has been confirmed that the effects of the present invention cannot be exhibited with ballpoint pens using these inks.
Moreover, when the presence or absence of the dilatant fluid characteristics was confirmed for the ink of Example 1, as is clear from the measurement results of Table 2, the dilatant fluid was found in the shear rate region of a shear rate of 1-381 s ⁻¹ (25 ° C.). It was confirmed that there was no characteristic (the state of the fluid in which the viscosity increases with increasing shear rate) and that the shear thinning was exhibited. In addition, it was confirmed that each of the inks of Examples 2 to 5 had no dilatant fluid characteristics and exhibited shear thinning in a shear rate region of a shear rate of ^{1 to} 281 s ⁻¹ (25 ° C.).
Further, as the ballpoint pen, the ink used in Examples 1 to 5 is mounted using a ballpoint pen (Mitsubishi Pencil Co., Ltd. prototype, ballpoint pen tip: cemented carbide ball, ball diameter 0.7 mm) conforming to FIGS. Then, when evaluated by the above evaluation methods, even if the stroke width can be varied, as in the case of the ballpoint pen (based on FIGS. 1 to 6) using the inks of Examples 1 to 6, the bold stroke is drawn. It was confirmed that continuity from the thin line portion to the thick line portion could be smoothly written without any decrease in drying property, blurring of the thick line portion, or blurring of the fine line portion.

  It can be used for writing instruments such as ballpoint pens.

DESCRIPTION OF SYMBOLS 1 Ball-point pen 10 Shaft cylinder 11 Shaft main body 12 Lead shaft part 13 Ink storage part 14 Joint 20 Ball-point pen tip 21 Holder 22 Taper part 23 Caulking part 24 Ball house 25 Core 30 Writing ball 40 Ink supply part 41 Collector 42 Tip holding part 43 Collector core
50 Outer 51 Outer tip 52 Rear insertion hole 53 Front insertion hole 54 Tapered part

Claims (6)

  A ballpoint pen equipped with an ink, wherein the ballpoint pen can be drawn with different thicknesses, and the ink contains at least polyvinyl alcohol and a boric acid compound.   2. The ballpoint pen according to claim 1, wherein the degree of polymerization of the polyvinyl alcohol is 50 to 2000.   The ballpoint pen according to claim 1, wherein the polyvinyl alcohol is a modified polyvinyl alcohol.   The ballpoint pen is capable of writing strokes with different thicknesses at one writing tip, a writing ball, a holder for holding the writing ball by a crimped portion crimped at the tip, and an ink for supplying ink to the holder A supply unit; a shaft cylinder that houses the ink supply unit; and an outer that covers an outer periphery of the holder; and the holder that holds the writing ball and a part of the outer part are exposed from the tip of the shaft cylinder. The ballpoint pen according to any one of claims 1 to 3, wherein the writing ball and the outer tip end portion become a writing portion.   The ball-point pen is capable of writing strokes having different thicknesses depending on two writing parts, and includes a writing ball, a first writing part that holds the writing ball by a caulking part with a crimped tip, and a first writing part An ink supply unit that supplies ink to the writing unit; a shaft cylinder that houses the ink supply unit; and a second writing unit that covers an outer periphery of the first writing unit, and holds the writing ball A ballpoint pen in which a part of the first writing unit and the second writing unit is exposed from the tip of the shaft tube, and the axial direction between the second writing unit and the first writing unit is Displacement means capable of relatively changing the positional relationship is provided, and the displacement means is configured such that the relative position between the second writing portion and the first writing portion is an immersion position of the first writing portion. The first writing part and the second writing part. Ballpoint pen according to any one of claims 1 to 3, characterized in that it is formed so that it can be contacted at the same time writing surface ends.   The displacement means is an elastic member arranged behind the first writing unit, and the relative position between the second writing unit and the first writing unit is determined by the second writing unit. An immersive position of the first writing part that covers a portion until the tip part reaches the crimped part of the writing ball, and a tip part of the second writing part is behind the immersive position of the first writing part. The first writing part can be displaced to the protruding position of the first writing part, and the load from the tip direction is applied to the first writing part with the protruding position of the first writing part as an initial position. The elastic member is compressed and deformed, the first writing unit is moved rearward, and the first writing unit can be moved to the immersive position of the first writing unit. The ballpoint pen according to claim 5.

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