Writing instruments and pen components

Abstract

To provide a pen member having appropriate flexibility and hardness, and a writing instrument including the same.SOLUTION: The pen member 13 is constituted of a Co-Ni alloy in which a plurality of thin plate materials are stacked to form ink channels shaped like fine gaps between the plurality of thin plate materials, and the writing instrument 10 including the same; a part or all of the thin plate materials includes 30.9 to 37.2% of Co, 31.4 to 33.4% of Ni, 19.5 to 20.5% of Cr, 9.5 to 10.5% of Mo, 0.1 to 0.5% of Mn, 0.3 to 0.7 of Ti, 1.1.to 2.1 of Fe, 0.8 to 1.2% of Nb, 0.01 to 0.02% of rare earth metals in terms of mass%, and inevitable impurities, and has a Vickers hardness of 450 to 800 Hv.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to writing instruments. More specifically, it relates to a writing instrument comprising a pen member formed by stacking a plurality of thin plate materials made of an alloy having a specific composition and having a specific hardness, and to the pen member thereof.

Background Art

[0002] Conventionally, writing instruments comprising a pen member formed by stacking a plurality of thin plate materials have been known. Such writing instruments utilize the capillary force generated in the gaps between the thin plate materials to guide ink from the ink tank to the pen tip, enabling writing.

[0003] Various characteristics are required for the pen member used in such writing instruments. Specifically, it is required to have high corrosion resistance so as not to deteriorate even when in contact with ink or the like, and also to have appropriate flexibility and hardness in order to obtain a good writing feeling. Since the capillary force in the gaps between the thin plate materials is utilized, flexibility and hardness are also important characteristics for stabilizing the supply of ink. Furthermore, since the thin plate material comes into direct contact with a writing target such as paper, it is also required to have high wear resistance.

[0004] Few materials satisfy all of these characteristics at a high level, and until now, stainless steel has often been used as the material for thin sheets. However, it is extremely difficult to balance flexibility and hardness in pen components made of stainless steel sheets. In other words, if the thickness of the sheet is reduced to ensure flexibility and increase the flex of the pen component, strength and durability deteriorate at the expense of writing feel. Furthermore, if this flex becomes too great, the width of the gaps in the sheet becomes unstable, and the ink supply also becomes unstable. To improve such problems, it becomes necessary to shorten the length of the pen component (length from the pen shaft to the writing tip), which tends to make the tip of the pen component difficult to see while writing and makes it difficult to write. Writing instruments equipped with pen components made by layering multiple thin sheets have the characteristic of being able to easily form thick lines, but even when creating pen components with different writing widths, there were many limitations on the shape design. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 08-052976 [Patent Document 2] Patent No. 3041585 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] To address the aforementioned challenges, there was a need for a writing instrument that possessed a pen component with appropriate flexibility and hardness, capable of forming various handwriting patterns, and easy to use. [Means for solving the problem]

[0007] A writing instrument according to an embodiment of the present invention comprises a pen member in which a plurality of thin plates are stacked, and a minute gap-like ink channel is formed between the plurality of thin plates along its entire length from the tip to the rear end, A pen core having a storage groove for housing the aforementioned pen member formed along its entire length, The pen member is fitted into the storage groove with its tip protruding forward, A writing instrument in which the ink channel is connected to an ink tank provided at the rear end of the pen nib, Some or all of the aforementioned thin plate material is by mass ratio Co 30.9~37.2%, Ni 31.4~33.4%, Cr 19.5~20.5%, Mo 9.5~10.5%, Mn 0.1~0.5%, Ti 0.3~0.7%, Fe 1.1~2.1%, Nb 0.8~1.2%, Rare earth metals 0.01-0.02%, and Inevitable impurities It is characterized by being composed of a Co-Ni-based alloy having a Vickers hardness of 450 to 800 Hv.

[0008] A fountain pen according to a second embodiment of the present invention comprises a metal nib, wherein part or all of the nib is, by mass ratio Co 30.9~37.2%, Ni 31.4~33.4%, Cr 19.5~20.5%, Mo 9.5~10.5%, Mn 0.1~0.5%, Ti 0.3~0.7%, Fe 1.1~2.1%, Nb 0.8~1.2%, Rare earth metals 0.01-0.02%, and Inevitable impurities It is made of a Co-Ni-based alloy and is characterized by having a portion with a Vickers hardness of 450 to 800 Hv on or near the center line of the pen tip.

[0009] Also, the pen member for a writing instrument according to the present invention is a pen member for a writing instrument in which a plurality of thin plate materials are stacked, and a minute gap-like ink flow path is formed between the plurality of thin plate materials over the entire length from the tip end portion to the rear end portion, part or all of the thin plate material is, by mass ratio Co 30.9 to 37.2%, Ni 31.4 to 33.4%, Cr 19.5 to 20.5%, Mo 9.5 to 10.5%, Mn 0.1 to 0.5%, Ti 0.3 to 0.7%, Fe 1.1 to 2.1%, Nb 0.8 to 1.2%, rare earth metal 0.01 to 0.02%, and inevitable impurities and is composed of a Co-Ni-based alloy having a Vickers hardness of 450 to 800 Hv, and a part of the rear end portion is fixed to each other in a state where the plurality of thin plate materials form the ink flow path, and the unfixed portions of the plurality of thin plate materials elastically deform so as to cause relative sliding displacement by the writing pressure applied to the tip end portion of the plurality of thin plate materials.

Advantages of the Invention

[0010] According to the present invention, there are provided a pen member having an excellent balance between flexibility and hardness and capable of realizing a good writing feeling, and a writing instrument including the same. The pen member used here uses an alloy having a specific composition, maintains corrosion resistance equal to or higher than that of a conventional pen member, and has an excellent balance between flexibility and hardness. Therefore, the degree of freedom in its shape design is high, and while realizing excellent writing performance, it can be a pen member capable of forming more diverse handwriting.

Brief Description of the Drawings

[0011] [Figure 1] A cross-sectional view showing the writing instrument according to the present invention in a cross-sectional state in the horizontal direction. [Figure 2] A longitudinal sectional view showing the writing instrument according to the present invention in a cross-sectional state in the vertical direction. [Figure 3] Cross-sectional view taken along line A-A of FIG. 2. [Figure 4] Cross-sectional view taken along line B-B of FIG. 2. [Figure 5] Cross-sectional view taken along line C-C of FIG. 2. [Figure 6] Front view showing the pen member used in the writing instrument according to the present invention. [Figure 7] Plan view showing the pen member used in the writing instrument according to the present invention. [Figure 8] Enlarged view of the main part of the pen member used in the writing instrument according to the present invention, enlarged in the state seen from the front. [Figure 9] Enlarged view of the main part of the pen member used in the writing instrument according to the present invention, enlarged in the state seen from the side. [Figure 10] Enlarged view of the main part of another embodiment of the pen member used in the writing instrument according to the present invention, enlarged in the state seen from the front. [Figure 11] Enlarged view of the main part of another embodiment of the pen member used in the writing instrument according to the present invention, enlarged in the state seen from the side. [Figure 12] Front view showing another embodiment of the pen member used in the writing instrument according to the present invention. [Figure 13] Front view showing another embodiment of the pen member used in the writing instrument according to the present invention. [Figure 14] Plan view showing another embodiment of the pen member used in the writing instrument according to the present invention. [Figure 15] Perspective view explaining the usage state of the writing instrument according to the present invention. [Figure 16] Perspective view explaining the usage state of the writing instrument according to the present invention. [Figure 17] Perspective view explaining the usage state of another embodiment of the writing instrument according to the present invention. [Figure 18] Perspective view explaining the usage state of another embodiment of the writing instrument according to the present invention. [Figure 19] Front view showing another embodiment of the pen member used in the writing instrument according to the present invention. [Figure 20]A front view showing another embodiment of the pen member used in the writing instrument according to the present invention. [Figure 21] A front view showing the shape of the tip portion of the thin sheet material used in the examples and comparative examples. [Figure 22] A front view showing the shape of the tip of the thin sheet material used in the embodiment. [Modes for carrying out the invention]

[0012] The embodiments of the present invention will be described in detail below.

[0013] <Writing implements> An embodiment of the writing instrument according to the present invention will be described below with reference to the drawings. In Figure 1, the writing instrument, which is shown as a whole by reference numeral 10, comprises a neck tube 11, a pen tip 12, and a pen member 13, and the neck tube 11 is formed in a cylindrical shape. The rear end 11a of the neck tube 11 has a small outer diameter, and an ink tank 14 is detachably fitted into the rear end 11a. Furthermore, a screw 11b is formed on the circumferential surface of the neck tube 11 near the rear end 11a, and the tip of the main body 15 is screw-connected to the screw 11b. The main body 15 is formed in a cylindrical shape, and the ink tank 14 is fitted inside the main body 15.

[0014] A pen tip 12 is fitted inside the neck barrel 11. The pen tip 12 has tapered surfaces 12a, 12a formed at its tip and a stepped portion 12b formed at its rear end. A storage groove 16 is formed on the axis of the pen tip 12, and the storage groove 16 opens at the front and rear ends of the pen tip 12. The storage groove 16 is formed in a rectangular cross-section (see Figures 3, 4, and 5) and is tapered at the front end of the pen tip 12 (see Figure 2). The storage groove 16 communicates with the ink tank 14 at its rear end (see Figure 1).

[0015] An air groove 16a is formed at the rear end of the pen nib 12, parallel to the storage groove 16, and the air groove 16a communicates with the inside of the ink tank 14. An air groove 16b is connected to the front end of the air groove 16a, and the air groove 16b communicates with the storage groove 16. Therefore, the air groove 16c (see Figure 2), which is formed when the pen member 13 (described later) is fitted into the storage groove 16, communicates with the air groove 16b. Since the tip of the air groove 16c is in contact with the outside air, the ink tank 14 is in contact with the outside air via the air grooves 16a, 16b, and 16c. In addition, the cross-sectional areas of the air grooves 16b and 16c are set to be larger than the cross-sectional area of ​​the air groove 16a.

[0016] In this way, by setting the cross-sectional area of ​​the air grooves 16b and 16c to be relatively large, the ink suction speed and suction efficiency can be improved. That is, when an ink suction mechanism type ink tank is used for the ink tank 14, when ink is drawn in from the pen member 13 side via the ink flow path 20 (described later), ink is drawn into the ink tank 14 not only via the ink flow path 20 but also via the air grooves 16c and 16b, thus improving the ink suction speed and suction efficiency. On the other hand, the air groove 16a adjusts the amount of ink that flows out of the ink tank 14 during writing. In addition to the ink suction mechanism type ink tank, there is also a spare ink tank for the ink tank 14.

[0017] A collector space 17 is formed in the center of the pen nib 12. The collector space 17 is formed between adjacent fins 17a by forming multiple fins 17a at predetermined intervals. The collector space 17 is connected to the storage groove 16 via multiple collector inlets 17b (see Figure 4). Therefore, the collector space 17 is connected to the inside of the ink tank 14 via the storage groove 16.

[0018] The gaps between the multiple collector inlets 17b are set to be narrow, for example, 0.1 mm or less, and an ink film is always formed on the multiple collector inlets 17b due to surface tension. As a result, the multiple collector inlets 17b act as water packing. Therefore, when the ink tank 14 is used with an ink tank with an ink suction mechanism to draw ink from the pen member 13 side, even if the pressure inside the ink tank 14 is reduced, the ink film on the multiple collector inlets 17b is not broken, thus preventing air from entering the ink flow path 20 from the multiple collector spaces 17 via the multiple collector inlets 17b.

[0019] As a result, when ink is drawn in from the pen member 13 side, as described later, ink is not drawn into the multiple collector spaces 17, improving the ink drawing efficiency. Therefore, ink can be drawn into the ink tank 14 by immersing the pen nib 12 up to the center of the sloped surface 12a, without immersing the multiple collector spaces 17 in the ink liquid surface in the ink fountain.

[0020] Furthermore, as shown in Figure 2, an air vent groove 17c extends axially from the lower center of the pen tip 12, and the air vent groove 17c communicates with the collector space 17. The air vent groove 17c is covered by the neck barrel 11 except for its tip. Therefore, the collector space 17 is in communication with the outside air via the tip of the air vent groove 17c. In this way, the collector space 17 communicates with the inside of the ink tank 14 via the storage groove 16 and is also in communication with the outside air via the tip of the air vent groove 17c.

[0021] Figures 6 and 7 show one embodiment of a pen member 13 that can be used in a writing instrument according to the present invention. These figures show an example of a pen member 13 composed of two thin plates. The pen member 13 shown in these figures consists of two identical thin plates 13a and 13b, which are elastic and formed in a substantially rectangular shape. Here, the thin plates 13a and 13b are formed from a specific material, which will be described later.

[0022] In the writing instrument according to the present invention, part or all of the thin plate material by mass ratio Co 30.9~37.2%, Ni 31.4~33.4%, Cr 19.5~20.5%, Mo 9.5~10.5%, Mn 0.1~0.5%, Ti 0.3~0.7%, Fe 1.1~2.1%, Nb 0.8~1.2%, Rare earth metals 0.01-0.02%, and Inevitable impurities It is composed of a Co-Ni-based alloy consisting of the above. According to the inventors' studies, although various Co-Ni-based alloys are known, the Co-Ni-based alloy satisfying the above composition contains components suitable for ink and, in some cases, exhibits excellent corrosion resistance to ink compositions with low pH values, compared to other alloys containing high proportions of Co and Ni. Furthermore, it is excellent not only in corrosion resistance but also in mechanical properties such as hardness and durability, and by combining it with the pen member having a structure of stacking multiple thin plates and the writing instrument equipped therewith according to the present invention, excellent properties can be realized. Such a Co-Ni-based alloy that combines corrosion resistance, high strength, and high durability is also described in Patent Document 2, for example. It is also marketed under the trade name SPRON510 (manufactured by Seiko Instruments Inc.).

[0023] According to the inventors' research, it has been found that using an alloy with such plasticity makes it possible to create a pen tip with high corrosion resistance to ink compositions. Furthermore, by rolling a thin sheet of the above alloy to an appropriate thickness, it is possible to achieve a writing feel equivalent to or better than that of writing instruments that use thin sheets made of stainless steel or other materials that are commonly used. Normally, while reducing the thickness of a thin sheet can improve the writing feel, it can result in insufficient strength and durability. However, this thin sheet made of Co-Ni alloy has sufficient strength and flexibility, thus achieving excellent properties as a writing instrument equipped with a thin sheet. Moreover, by using a material that has been heat-treated under specific processing conditions as the material for the thin sheet, it is possible to achieve a soft writing feel while simultaneously realizing superior mechanical durability.

[0024] Specifically, in some or all of the thin sheet materials used in the pen components of the present invention, the Vickers hardness is 450 to 800 Hv, preferably 500 to 600 Hv, and more preferably 550 to 600 Hv. Thin sheet materials made of Co-Ni alloy having such hardness can achieve a soft writing feel by adjusting the thickness of the sheet material constituting the thin sheet material, while exhibiting superior strength and durability compared to thin sheet materials with lower hardness than the range specified by the present invention, such as stainless steel thin sheet material. On the other hand, writing instruments using thin sheet materials made of alloys with higher hardness than the range specified by the present invention generally have superior strength and durability in proportion to the hardness, but not only do they fail to provide a soft writing feel, but it is also difficult to achieve a satisfactory writing feel.

[0025] Furthermore, the Vickers hardness of sheet metal can vary depending on the part of the material. That is, sheet metal can be subjected to processes such as molding, rolling, or heating as needed. These processes can change the hardness of the sheet metal in different parts. For example, as will be described later, a part of the sheet metal is housed in the pen nib of a writing instrument, and the hardness of that part has little effect on the writing feel. On the other hand, the hardness and flexibility of the writing tip side of the sheet metal, for example, the tip of the nib, greatly affect the writing feel. For this reason, it is preferable to have appropriate hardness in different parts.

[0026] Specifically, by imparting appropriate hardness to the tip portion, the thin sheet material can be given appropriate flexibility, thereby achieving an excellent brush feel. More specifically, it is preferable that the tip portion has a Vickers hardness of 450 to 800 Hv, more preferably 500 to 600 Hv, and particularly preferably 550 to 600 Hv.

[0027] In this invention, Vickers hardness can be measured in accordance with the Vickers hardness test specified in JIS Z 2244.

[0028] Furthermore, the thin sheet material used in this invention has excellent corrosion resistance. Metal materials generally tend to have low corrosion resistance; for example, when immersed in acid, they dissolve in the acid and lose weight. However, the Co-Ni alloy used in this invention has high corrosion resistance and is resistant to alteration even when in contact with ink. The corrosion resistance of an alloy can be evaluated by a corrosion resistance test. Specifically, when a sample of 20 mm in diameter and 0.25 g in mass is immersed in 36% hydrochloric acid for 72 hours at 60°C, the mass reduction of the sample after immersion, relative to the sample mass before immersion, is preferably 30% or less, more preferably 20% or less, and more preferably 10% or less. Stainless steel (SUS301, SUS304, SUS316L, etc.), which is generally a highly corrosion-resistant metal material, shows a mass reduction rate of over 90% when evaluated under such conditions; therefore, the pen tip according to this invention has extremely high corrosion resistance.

[0029] Furthermore, the thin sheet material used in the present invention preferably has a Young's modulus of 210 to 230 GPa, and more preferably 215 to 225 GPa. The thin sheet material used in the present invention has a Young's modulus higher than that of stainless steel, enabling a satisfying writing feel with excellent responsiveness to variations in writing pressure. In this invention, the Young's modulus can be measured, for example, by the free resonance method.

[0030] The thin sheet material used in the present invention may be entirely composed of the aforementioned Co-Ni-based alloy, or only a part of it may be composed of the aforementioned Co-Ni-based alloy. That is, in order to achieve a soft writing feel, it is sufficient that the part that adjusts the pressure during writing is composed of the aforementioned Co-Ni-based alloy. More specifically, it is sufficient that the tip of the writing instrument is composed of the aforementioned Co-Ni-based alloy. In such cases, other alloys can be joined to the remaining part of the thin sheet material. However, even in such cases, it is desirable that the metal part constituting the thin sheet material has corrosion resistance, so it is preferable that the alloy constituting the remaining part of the pen tip also has the composition of the aforementioned Co-Ni-based alloy. By forming the part corresponding to the tip of the thin sheet material with the Co-Ni-based alloy, performing a specific heat treatment, and then joining other alloys to the remaining part of the thin sheet material, it becomes possible to manufacture a pen component without excessively impairing formability while using a material with high hardness.

[0031] The manufacturing process for thin sheet materials basically includes (a) punching out a sheet material made of a Co-Ni-based alloy having the above composition into the shape of a pen tip body to form a metal piece, (b) shaping the resulting metal piece as needed, and (c) further heat treatment as needed.

[0032] The plate-like material made of alloy used in the present invention is manufactured by mixing raw metals in a predetermined ratio, melting them by vacuum melting, and then rolling them. The rolled plate-like material may have a uniform thickness, or it may have a thickness that changes continuously in one direction, for example. Using the latter plate-like material, by adjusting the orientation of the metal piece punched out during punching, it is possible to obtain, for example, a metal piece with a relatively thick thickness from a thin plate (step (a)).

[0033] The resulting metal pieces are shaped as needed (step (b)). Generally, slits are made in the paper-joint portion of the thin sheet material, or grooves are formed on the surface of the thin sheet material by pressing.

[0034] In the present invention, a further specific (c) heat treatment may be performed. Specifically, this further includes a step of heat-treating part or all of the metal piece at 400 to 620°C, preferably 500 to 550°C, for 1 to 3 hours, preferably 1.5 to 2.5 hours, before step (a), between step (a) and step (b), or after step (b). The heating is preferably carried out in a vacuum or in an inert gas atmosphere. This heat treatment can appropriately improve the hardness of the thin sheet material and simultaneously impart durability. The heating means are not particularly limited, and in addition to heating in a heating furnace, heating by high-frequency induction, microwave, or infrared irradiation can also be employed.

[0035] Furthermore, to achieve both moldability and durability, different heat treatments can be applied to the tip portion of the thin sheet material and the rest of the material, such as the part housed in the pen nib. Such heat treatments can be easily achieved by heating using high-frequency induction, microwaves, or infrared irradiation, or by employing a direct current heating method in which electricity is directly applied to the part to be heated to generate Joule heat.

[0036] In addition to the processes described above, any known method for processing metal components can be used to process the thin sheet material used in the pen component according to the present invention. For example, the thin sheet material can be engraved for decorative purposes, or coated with rhodium or gold plating. Furthermore, hard chrome plating or diamond-like carbon coating can also be applied.

[0037] The thin sheet materials 13a and 13b, composed of the specific materials described above, are excellent in flexibility, hardness, corrosion resistance, wear resistance, processability, and cost-effectiveness. Furthermore, these specific materials achieve both excellent hardness and excellent flexibility, making it possible to make them thinner than the thin sheet materials made of stainless steel or the like that were commonly used for such pen components in the past. Specifically, the thickness of the thin sheet material according to the present invention is preferably 0.18 mm or less, and more preferably 0.15 mm or less.

[0038] A projection 19a is formed at the leading edge of the thin plate material 13b. Additionally, projections 19b and 19b are formed at the rear end of the thin plate material 13b. The height of projection 19a is set such that, when the thin plate material 13a and thin plate material 13b are stacked, the gap between the leading edges of the thin plate materials is, for example, approximately 0.01 mm to 0.05 mm. The height of projection 19b is set such that, when the thin plate material 13a and thin plate material 13b are stacked, the gap between them is, for example, approximately 0.07 mm to 0.15 mm. As a result, an ink flow path 20 is formed by stacking the thin plate material 13a and thin plate material 13b.

[0039] Here, we will explain how to stack thin sheet materials 13a and 13b. First, thin sheet materials 13a and 13b are stacked on top of each other, and the multiple protrusions 19b, 19b of thin sheet material 13b are brought into contact with thin sheet material 13a. In this state, thin sheet materials 13a and 13b are welded together by spot welding or laser welding. In this case, the welding is performed at several locations or over the entire rear end (fixing part s) of thin sheet materials 13a and 13b to the minimum extent possible so as not to narrow the ink flow path dimensions, and the leading ends of thin sheet materials 13a and 13b are left as free ends. Therefore, when a pressing force is applied to the leading ends of thin sheet materials 13a and 13b, elastic deformation occurs in the elastic parts m other than the fixing part s, causing sliding displacement between thin sheet materials 13a and 13b.

[0040] In the above embodiment, the case in which the thin sheet material 13a and the thin sheet material 13b are welded together using the multiple protrusions 19b of the thin sheet material 13b has been described. However, the invention is not limited to this, and it is also possible to weld the outer circumferences of the thin sheet material 13a and the thin sheet material 13b at several points by laser welding or the like while the thin sheet material 13a and the thin sheet material 13b are stacked on top of each other. In this case, the multiple protrusions 19b of the thin sheet material 13b serve only as spacers to form an ink channel 20 between the thin sheet material 13a and the thin sheet material 13b.

[0041] Furthermore, the fixing part s can also be fixed by methods other than welding as described above. For example, by forming recesses and protrusions that engage with each other in the thin plate material 13a and thin plate material 13b, the thin plate material 13a and thin plate material 13b can be stacked by engaging the recesses and protrusions. Moreover, in addition to welding, they can also be fixed with members such as screws or by bonding with adhesive. By stacking multiple thin plate materials and fixing them to each other using any of these methods, a pen member according to the present invention can be obtained. Furthermore, by stacking thin sheet materials 13a and 13b without fixing them to each other and fitting them into the storage groove 16 of the pen nib 12, the fixing parts s of the stacked thin sheet materials 13a and 13b can be fixed, thereby creating the writing instrument according to the present invention. This method eliminates the need for welding or other fixing processes during manufacturing.

[0042] In the above embodiment, the case in which protrusions 19a and 19b are formed between thin sheet material 13a and thin sheet material 13b to form the ink channel 20 has been described, but the invention is not limited to this, and the ink channel 20 may be formed between thin sheet material 13a and thin sheet material 13b by other methods. For example, it is also possible to form the ink channel 20 by sandwiching a spacer between thin sheet material 13a and thin sheet material 13b. Furthermore, it is also possible to form the ink channel 20 by forming grooves in thin sheet material 13a and 13b by etching, or by forming steps in thin sheet material 13a and 13b by coining during presswork.

[0043] In this way, the tips of the overlapping thin plates 13a and 13b have a tapered enlarged section, and the tapered surface of this enlarged section is formed to be parallel to the tapered surface of the pen tip 12 at a predetermined distance. Multiple slits 21 with a width of 0.01 mm to 0.05 mm are formed at the tips of the thin plates 13a and 13b, for example, five slits each (see Figures 8 and 9). As a result, the ink guided to the tips of the thin plates 13a and 13b via the ink flow path 20 is guided to the outside of the thin plates 13a and 13b through the multiple slits 21.

[0044] Therefore, ink can be transferred onto the paper even when the pen member 13 is inclined with respect to the paper surface (not shown) during writing. In contrast, if slits 21 are not formed at the tips of the thin plate materials 13a and 13b, ink may not be transferred onto the paper unless the pen member 13 is held approximately perpendicular to the paper surface (not shown) during writing.

[0045] The length of the slit 21 is set to, for example, about 0.5 mm to 1.0 mm, and does not require the length of a typical fountain pen, for example, 5.0 mm. Therefore, the strength of the tip of the pen member 13 (strength to withstand external forces that cause the tip of the pen member 13 to vibrate due to contact with the writing paper) can be made stronger compared to conventional writing instruments. This slit 21 can be formed by shearing with a press or cutting by grinding. Although the slit 21 in Figures 8 and 9 is shown without a pinhole at the end, it is not limited to this, and a pinhole 21a may be formed at the end of the slit 21 as shown in Figures 10 and 11.

[0046] Furthermore, the tips of the thin plates 13a and 13b are preferably rounded at a radius of, for example, 0.02 mm or more, similar to the conventional pen contact portion, in order to improve the glide with the writing paper when they come into contact with the writing paper. The pen member 13 has the corners of the thin plates 13a and 13b as the first contact portion a1 and the second contact portion a2, respectively (see Figure 6), and the first contact portion a1 and the second contact portion a2 are used as the writing surface in the state shown in Figure 15. When the writing instrument 10 is used in a state that is slightly twisted (rotated) from the state shown in Figure 15, the thin plates 13a and 13b displace in a way that causes them to rub against each other in the vertical direction during the writing motion, so that the ink flows smoothly through the ink channel 20. The stroke widths A and A' of the first contact portion a1 and the second contact portion a2 are the same, but the stroke widths A and A' can be changed depending on how the angles of each are rounded. Furthermore, it is possible to form a wide stroke by making contact with the entire edge between the first contact portion a1 and the second contact portion a2. However, when this type of writing is intended, the edge between the first contact portion a1 and the second contact portion a2 does not need to be perpendicular to the longitudinal direction of the pen member. Rather, it may be appropriate to make it less than 90° (so that the inclination angle θ, described later, exceeds 0°).

[0047] As shown in Figure 7, the pen member 13 has an outer width corner of the thin plate material 13a that becomes the third paper contact portion a3, and an outer width corner of the thin plate material 13b that becomes the fourth paper contact portion a4. The third paper contact portion a3 and the fourth paper contact portion a4 are used as the writing surface in the state shown in Figure 16. When the writing instrument 10 is used in the state shown in Figure 16, the thin plate materials 13a and 13b are displaced in a way that causes them to rub against each other in the left-right and length directions during the writing motion. Therefore, even if ink residue is generated in the ink, the ink residue in the ink channel 20 is easily detached from the thin plate material 13a or 13b and discharged from the ink channel 20. This makes it easier for the ink to flow smoothly within the ink channel 20. Furthermore, when the writing instrument 10 is used in the state shown in Figure 16, the writing pressure applied to the thin plate materials 13a and 13b changes, causing the thin plate materials 13a and 13b to undergo continuous elastic deformation. In this case, since the curvature of the thin plates 13a and 13b are different, the relative position of the thin plates 13a and 13b changes. Therefore, even if ink residue is generated, it is easily detached from the thin plates 13a or 13b and discharged from within the ink flow path 20. This allows the ink to flow smoothly within the ink flow path 20. The writing widths B and B' of the third paper contact portion a3 and the fourth paper contact portion a4 are the same. In the writing instrument of the present invention, since the pen member is made of a material with excellent hardness and flexibility, the length of the part of the pen member that protrudes from the pen nib (sometimes called the tip) can be made longer than that of conventional pen members made of stainless steel or the like. This part of the pen member that protrudes from the pen nib is represented by L in Figure 2 or Figure 15. In the writing instrument of the present invention, it is preferable that the length of L be 7 mm or more, and more preferably 8 mm or more. The shape of the tip can be selected according to the purpose, for example, a rectangle, parallelogram, trapezoid, or semicircle.

[0048] The pen member 13 formed in this manner is fitted into the storage groove 16 from the tip of the pen nib 12, and the ink flow path 20 communicates with the ink tank 14. Therefore, ink from the ink tank 14 is drawn into the ink flow path 20 by capillary force, and the ink drawn into the ink flow path 20 is guided to the tip of the pen member 13. As a result, when writing, ink is transferred to the writing paper through the multiple slits 21 at the tip of the pen member 13.

[0049] Furthermore, steps 19d and 19e are formed near the fixing portions s of the thin plate materials 13a and 13b, and when the pen member 13 is fitted into the storage groove 16, a space is formed between the pen member 13 and the storage groove 16. As a result, when writing force is applied to the tip of the pen member 13 in the writing state shown in Figure 15, the pen member 13 is displaced in the width direction (direction of arrow A in Figure 6). In this case, since the section modulus of the pen member 13 is extremely large, the amount of displacement in the direction of arrow A in Figure 6 is minute, but a displacement of about the thickness of the thin plate materials 13a and 13b is possible. Therefore, when writing with the first paper contact portion a1 and the second paper contact portion a2 of the pen member 13, both the thin plate materials 13a and 13b can be brought into contact with the writing paper. Furthermore, by forming steps 19d and 19e on the thin plate materials 13a and 13b, when pressure is applied to the second paper contact portion a2 of the pen member 13 and the pen member 13 is displaced, the pen member 13 can easily return to its original position after the pressure is removed. In addition, by forming steps 19d on the thin plate materials 13a and 13b, when the pen member 13 is fitted into the storage groove 16, the aforementioned air groove 16c is formed between the thin plate materials 13a and 13b and the storage groove 16. Although steps 19d and 19e are formed asymmetrically in the width direction of the thin plate material 13b in Figure 6, the design is not limited to this, and steps 19d and 19e may be formed symmetrically in the width direction of the thin plate material 13b. Multiple protrusions 19c are formed on the outer surfaces of the thin plate materials 13a and 13b (the surfaces opposite to the surface where the ink flow path is formed). The protrusions 19c fix the pen member 13 when it is fitted into the storage groove 16 and prevent the formation of unnecessary gaps. The same effect can be obtained by forming the protrusions 19c on the inner surface of the storage groove 16 instead of on the thin plate materials.

[0050] Figure 12 shows another embodiment of the pen member 13. The pen member 13 shown in Figure 12 has narrowed writing widths for the third paper contact portion a3 and the fourth paper contact portion a4 of the pen member 13 shown in Figure 6. In this way, the writing widths for the third paper contact portion a3 and the fourth paper contact portion a4 can be arbitrarily set by changing the width of the pen member 13. In this case, the first paper contact portion a1 and the second paper contact portion a2 of the pen member 13 are set and kept constant by the thickness of the thin plate material 13a and the thin plate material 13b and the ink flow path 20, as shown in Figure 7, so there is no need to change the shape of the storage groove 16 of the pen nib 12. Figures 13 and 14 also show other embodiments of the pen member. The pen member 22 shown in Figures 13 and 14 is formed substantially the same as the pen member 13 shown in Figures 6 and 7. The difference between the pen member 22 and the pen member 13 is that the pen member 22 has a number of protrusions compared to the pen member 13. The pen member 22 will be described below in reference to Figures 13 and 14. Note that in Figures 13 and 14, components identical or similar to the pen component 13 shown in Figures 6 and 7 are denoted by the same reference numerals, and their descriptions are omitted.

[0051] Furthermore, the pen member according to the present invention offers a high degree of freedom in its shape design due to the use of a material with excellent physical properties. In other words, compared to conventional pen members made of stainless steel or other materials, sufficient hardness can be achieved with less material, thus reducing restrictions on shape. For this reason, for example, as shown in Figure 19, an opening 29 can be provided in the thin plate material 13a, or as shown in Figure 20, the width can be increased only near the paper contact area. These shapes reduce blind spots caused by the pen member during writing, improving the visibility of the paper surface and enabling a superior writing experience. Moreover, as shown in Figures 21 and 22, by making the width near the paper contact area narrower, a structure that is more flexible and bendable towards the tip can be created, thereby achieving a superior writing experience. In addition, the pen member shown in Figure 22 has a structure in which the paper contact area at the tip is not parallel to the width direction of the pen member. Generally, when writing or drawing with a writing instrument, the writing instrument is rarely held perpendicular to the paper surface, but is often tilted when writing or drawing. Therefore, it is preferable that the paper-contacting portion of the pen member has an inclination angle θ of 0 to 60° with respect to the width direction of the pen member. More preferably, the inclination angle θ is 10 to 45°, and particularly preferably 15 to 40°. With this shape, the tip of the pen member is more flexible, which also improves the writing feel.

[0052] The dimensions of the pen tip, as shown in Figures 19-22, are adjusted appropriately according to the intended writing instrument, except for the inclination angle θ. For example, in Figure 21 or 22, the width W1 of the paper contact area is adjusted according to the line width of the writing intended to be formed by the writing instrument. Specifically, a length of 0.5 to 30 mm is used. The ratio of W1 to W2, W1 / W2, is determined by the thickness of the shaft portion of the writing instrument (the part held by the fingers), i.e., the thickness of the part where the fixing part s of the pen member is housed, and the line width of the writing, and is usually around 0.1 to 5. If W1 / W2 is less than 1, the shape of the pen member will be as shown in Figure 21, for example, and if W1 / W2 is greater than 1, the shape of the pen member will be as shown in Figure 19. Furthermore, in the pen component shown in Figure 21, the length D1 of the narrow part near the tip and the length D2 of the part near the rear end are appropriately adjusted according to the intended writing instrument, but generally, D1 is 0.3 to 10 mm and D2 is 10 to 30 mm. In the pen component shown in Figure 22, for example, D1' is 0.3 to 10 mm and D2' is 10 to 30 mm. Here, D1' and D1, and D2' and D2 do not need to be the same.

[0053] The pen member 22 consists of two thin plates 22a and 22b of the same shape, with multiple protrusions 23a formed on the tip of the thin plate 22b. In addition, multiple protrusions 23b and multiple protrusions 23c are formed on the central and rear ends of the thin plate 13b. The height of the protrusions 23a is set so that the gap between the tips of the thin plates 22a and 22b when they are stacked together is, for example, about 0.01 mm to 0.05 mm. The height of the multiple protrusions 23b and multiple protrusions 23c is set so that the gap between the thin plates 22a and 22b when they are stacked together is, for example, about 0.07 mm to 0.15 mm. As a result, an ink flow path 20 is formed by stacking the thin plates 22a and 22b.

[0054] Here, the stacked thin sheets 22a and 22b are described. By stacking the thin sheets 22a and 22b, multiple protrusions 23c on the thin sheet 22b come into contact with the thin sheet 22a. In this state, the thin sheets 22a and 22b are welded together by spot welding or laser welding. In this case, the welding is performed at several locations or over the entire rear end (fixing part s) of the thin sheets 22a and 22b to the minimum extent possible so as not to narrow the ink flow path dimensions, and the leading ends of the thin sheets 22a and 22b are left as free ends. Therefore, when a pressing force is applied to the leading ends of the thin sheets 22a and 22b, elastic deformation occurs in the elastic parts m other than the fixing part s, causing sliding displacement between the thin sheets 22a and 22b.

[0055] The operation of the writing instrument configured as described above will now be explained. First, the flow of ink when inserted into the writing instrument will be explained using Figure 1. The pen member 13 has an ink channel 20 formed between the thin plate materials 13a and 13b, and the ink channel 20 is in communication with the ink tank 14. With this structure, the ink in the ink tank 14 can be transferred to the paper contact part of the pen member 13 using the capillary force of the ink channel 20. Therefore, the ink in the ink tank 14 can be smoothly transferred to the paper contact part of the pen member 13.

[0056] Furthermore, the air grooves 16a, 16b, and 16c formed in the pen nib 12 guide outside air into the ink tank 14 as ink is consumed, similar to conventional air grooves. In addition, ink that overflows from the ink tank 14 due to air expansion is stored in the collector space 17, and at the same time, the air stored in the collector space 17 is pushed out to the outside. This prevents a phenomenon known as ink dripping. Thus, when ink overflows from the ink tank 14 due to air expansion, ink fills the air grooves 16b and 16c to prevent ink dripping. However, when writing with the writing instrument 10, the ink stored in the air grooves 16b and 16c and the collector space 17 is first consumed from the paper contact portion of the pen member.

[0057] Then, after all the ink in the air channels 16b and 16c and the collector space 17 has been consumed, air is introduced from the outside into the ink tank 14 via the air channels 16a, 16b, and 16c, and the ink in the ink tank 14 is supplied to the paper contact portion of the pen member 13 or 22 via the ink flow path 20. On the other hand, when the air in the ink tank 14 contracts, the ink stored in the air channels 16b and 16c and the collector space 17 is drawn into the ink tank 14.

[0058] Next, we will describe the case when the writing instrument 10 is used in the state shown in Figure 15. When writing is done on the paper in this state and writing force is applied to the tip of the pen member 13, the paper-contacting portion of the pen member 13 is displaced in the width direction (direction of arrow A in Figure 15). In this case, the section modulus of the pen member 13 is extremely large, so the amount of displacement in the direction of arrow A is minute, but if a displacement of about the thickness of the thin plate material is possible, both the thin plate material 13a and 13b will come into contact with the writing paper. Also, since steps 19d and 19e (see Figure 6) are formed on the thin plate material 13a and 13b, even if the pen member 13 is displaced by the application of writing pressure, the pen member 13 will return to its pre-displacement state when the writing pressure is removed from the pen member 13. When the writing instrument 10 is used in the state shown in Figure 15, the stroke width will be A or A'. Note that stroke width A and stroke width A' are the same width.

[0059] On the other hand, when the writing instrument 10 is used in a state that is slightly twisted (rotated) from the state shown in Figure 15, the thin plate materials 13a and 13b are displaced in a way that causes them to rub against each other in the vertical direction during the writing action. As a result, any ink residue generated in the ink channel 20 is easily discharged, and the ink flows smoothly through the ink channel 20. Next, the case in which the writing instrument 10 is used in the state shown in Figure 16 will be described. In the case of Figure 16, writing is done with the third paper contact part a3 or the fourth paper contact part a4 of the pen member 13, so the stroke widths B and B' are wider than the stroke widths A and A' shown in Figure 15. In this case, the paper contact part of the pen member 13 is displaced in the direction of arrow B, but since a projection 19a (see Figure 6) is formed at the tip of the pen member 13, even when the paper contact part of the pen member 13 is displaced in the direction of arrow B, the gap between the tips of the thin plate materials 13a and 13b can be maintained at the aforementioned 0.01 mm to 0.05 mm.

[0060] Furthermore, when pressure is applied to the third paper contact portion a3 or the fourth paper contact portion a4 of the pen member 13, the thin plate materials 13a and 13b undergo elastic deformation with different curvatures. However, since the tip of the thin plate material is not fixed, the thin plate materials 13a and 13b can move. Therefore, ink residue in the ink channel 20 is easily detached from the thin plate material and discharged from the ink channel 20. This allows the ink to flow more smoothly through the ink channel 20. In the above embodiment, the case in which the pen member 13 is composed of two thin plate materials 13a and 13b has been described, but it is not limited to this, and as shown in Figure 17, the pen member 25 may be composed of three thin plate materials 25a, 25b, and 25c. This makes it possible to widen the stroke widths A and A' of the pen member 25. Note that the stroke widths B and B' of the pen member 25 are the same as the stroke widths B and B' of the pen member 13 shown in Figure 16.

[0061] Furthermore, as shown in Figure 18, notches 28 may be formed at the corners of the outer thin plate material 25b. By adopting such a structure, the stroke width A of the pen member 25 shown in Figure 18 can be made narrower than the stroke width A of the pen member 25 shown in Figure 17. Although Figures 17 and 18 show the case where multiple slits 26 are formed only in the outer thin plate materials 25a and 25b, the design is not limited to this, and slits may also be formed at the tip of the intermediate thin plate material 25c. In this case, the ink flow path 27 is connected through the slit formed at the tip of the intermediate thin plate material 25c. Therefore, the same amount of ink can be transferred to the writing paper from each of the multiple ink flow paths 27. Incidentally, according to the writing instrument 10 of the present invention, the ink tank 14 and the paper contact portion of the pen member 13 are connected by only one ink flow path 20, and the ink in the ink tank 14 can be transferred to the paper contact portion of the pen member 13 by utilizing the capillary action of the ink flow path 20. Therefore, by keeping the writing instrument 10 in a nearly horizontal position and supplying ink to the paper contact part of the writing instrument 10 using a dropper or the like, or by directly contacting the paper contact part (ink discharge part) of another writing instrument, ink of a different color from the ink in the ink tank 14 can be easily drawn into the ink channel 20. In this case, the ink supplied from the ink tank and present in the ink channel 20 is pushed back towards the ink tank 14 by the hydrostatic pressure of the other colored ink drawn in from the outside, and the other colored ink drawn in from the outside is drawn into the ink channel 20 without mixing with the ink that was previously filled in the ink channel 20. Therefore, in this state, the writing instrument 10 can be used to express a continuous change in color called a gradation, as shown below.

[0062] In other words, when writing is performed with another colored ink drawn into the ink channel 20 from an external source, the writing is first done with the color of the ink drawn in from the external source, and then the color resulting from the mixture of the ink drawn in from the external source and the ink that was pre-filled in the ink channel 20 is gradually written on the writing paper (this state is called gradation). Finally, when the ink drawn in from the external source is used up, the writing is done with only the color of the ink that was pre-filled in the ink channel 20.

[0063] Furthermore, as shown in Figure 16, when writing with the writing instrument 10 to produce a thick stroke width B (or B'), if ink of another color is drawn in only from one corner of the thin plate material 13a and 13b of the pen member 13, the ink of the other color will be transferred to the writing paper only from that corner of the thin plate material of the pen member 13. Therefore, the gradation will only appear in the portion drawn by one corner of the pen member 13. That is, first, only one side of the stroke width drawn by the pen member 13 will change color to the color of the drawn other ink, gradually creating a gradation, and then the entire stroke width will return to the color of the original ink that was previously filled in the ink channel 20.

[0064] Furthermore, as shown in Figure 16, when writing with a thick stroke width B (or B'), if the time spent drawing in ink of a different color from only one corner of the thin plate material 13a and 13b of the pen member 13 is extended, the ink drawn in from the outside will gradually widen as it approaches the ink tank 14 within the ink channel 20. In other words, the ink drawn in from the outside enters the ink channel 20 in a widening manner toward the ink tank 14. Therefore, when writing with the thick stroke widths B and B' shown in Figure 16 in this state, at the beginning of the stroke, only one side will change color to the color of the ink drawn in from the outside, while the other side will be the color of the ink in the ink tank 14. Then, the entire width of the stroke will quickly change color to the color of the ink drawn in from the outside, then gradually become a gradation, and finally return to the color of the ink in the ink tank 14. [Examples]

[0065] The present invention will be explained below using various examples.

[0066] [Examples 1-2 and Comparative Examples 1-2] A 0.15 mm thick plate-like material A, made of a Co-Ni-based alloy (product name SPRON510, manufactured by Seiko Instruments Inc.), was prepared. For comparison, plate-like materials B and C, made of stainless steel (SUS304) with thicknesses of 0.20 mm or 0.15 mm, were also prepared. The hardness of these plate-like materials is shown in Table 1.

[0067] [Table 1]

[0068] Each sheet material was punched out to obtain thin sheets for use in the writing instruments of Examples 1 and 2 and Comparative Examples 1 and 2. The shape of the tip of these thin sheets was as shown in Figure 21, and their dimensions were as shown in Table 2. For example, the thin sheet used in the writing instrument of Example 1 had a tip width W1 of 3.8 mm, a length D1 of the uniform width portion from the tip to the rear end in the longitudinal direction of 1.7 mm, a tapered portion length D2 of 5.5 mm from the uniform portion to the rear end, and a width W2 of 4.8 mm at the rear end of the tapered portion.

[0069] Two thin sheets of the thin plate material from Example 1 were stacked to form a pen member in which a minute gap-like ink channel was formed between them, extending along its entire length from the tip to the rear end. Furthermore, a pen nib with a storage groove formed along its entire length was combined with this pen member to form the writing instrument of Example 1. In this writing instrument, the tip of the pen member is fitted into the storage groove with the tip protruding forward, and the ink channel communicates with an ink tank provided at the rear end of the pen nib. The writing instruments of Example 2 and Comparative Examples 1 and 2 were manufactured in the same manner.

[0070] [Evaluation of load-bearing capacity tests] These writing instruments were evaluated using load-bearing tests. The test method was as follows: (1) The tip of the writing instrument is brought into contact with the paper at a 60° angle in the direction that will create a thick line width. While maintaining that angle, the entire writing instrument is moved in the direction of the paper at a speed of 5 mm / min to apply load to the tip of the pen. Once the predetermined load is reached, it is left still for 5 seconds to release the load. (2) Visually check the condition of the pen tip. The initial load was set to 500 gf, and the load was increased in 100 gf increments until deformation was observed. The operation (1) to (2) was repeated, and when deformation was observed, the load at the previous stage was set as the maximum load capacity of the sample. This series of measurements was performed for each of the three samples, and the average value of the measured values ​​was calculated. The results obtained are shown in Table 2. [Evaluation of deflection amount] Next, the amount of deflection (displacement of the pen tip) was measured for each example of writing instrument. The pen tip was brought into contact with the paper surface at a 10° angle, and a load of 100gf was applied to measure the amount of displacement. This series of measurements was performed for each of the three samples, and the average value of the measured values ​​was calculated. The results obtained are shown in Table 2. Note that for Comparative Example 1, the load-bearing test results showed that it was not practical, so the amount of deflection was not measured.

[0071] [Table 2]

[0072] [Example 3] Thin sheets were prepared by cutting the plate-like material A used in Example 1 into the shape shown in Figure 22. At this time, W1 = 3.8 mm, D1 = 1.7 mm, D2 = 5.5 mm, W2 = 4.8 mm. θ = 23°.

[0073] [Evaluation of deflection amount] A writing instrument was prepared in the same manner as in Example 1 using the prepared thin sheet material. The amount of deflection (displacement of the pen tip) was measured for this writing instrument. The paper contact portion a1 on the long side of the pen tip or the paper contact portion a2 on the short side was brought into contact with the paper surface at an angle of 10°, and a load of 100gf was applied to measure the amount of displacement. This series of measurements was performed three times for each paper contact portion a1 and paper contact portion a2, and the average value of the measured values ​​was calculated. The amount of deflection at paper contact portion a1 was 0.682 mm, and the amount of deflection at paper contact portion a2 was 0.428 mm. By using a pen tip with parts that have different amounts of deflection in this way, it is possible to increase the variations in the width of the lines that can be formed, and also to improve the writing performance.

Claims

1. A pen member comprising multiple thin plates stacked on top of each other, with minute gap-like ink channels formed between the multiple thin plates along its entire length from the tip to the rear end, A pen core having a storage groove for housing the aforementioned pen member formed along its entire length, The pen member is fitted into the storage groove with its tip protruding forward, A writing instrument in which the ink channel is connected to an ink tank provided at the rear end of the pen nib, Some or all of the aforementioned thin plate material is by mass ratio Co 30.9-37.2%, Ni 31.4-33.4%, Cr 19.5-20.5%, Mo 9.5-10.5%, Mn 0.1-0.5%, Ti 0.3-0.7%, Fe 1.1-2.1%, Nb 0.8-1.2%, Rare earth metals 0.01-0.02%, and Inevitable impurities A writing instrument characterized by being composed of a Co-Ni-based alloy having a Vickers hardness of 450 to 800 Hv.

2. The writing instrument according to claim 1, wherein when a sample made of the Co-Ni alloy, with a diameter of 20 mm and a mass of 0.025 g, is immersed in 36% hydrochloric acid at 60°C for 72 hours, the mass reduction of the sample after immersion, relative to the mass of the sample before immersion, is 30% or less.

3. The writing instrument according to claim 1 or 2, wherein the Young's modulus of the thin plate material is 210 to 230 GPa.

4. The writing instrument according to claim 1 or 2, wherein the thickness of the thin plate material is 0.18 mm or less.

5. The writing instrument according to claim 1 or 2, wherein the length of the portion of the pen member that protrudes from the pen tip is 7 mm or more.

6. The writing instrument according to claim 1 or 2, wherein the plurality of thin plates are fixed in the storage groove at positions where they are close together on the wall surface of the storage groove, thereby forming the ink flow path.

7. The writing instrument according to claim 1 or 2, wherein a slit communicating with the ink channel is formed at the tip of the pen member.

8. The writing instrument according to claim 1 or 2, wherein the rear end of the pen nib is formed with a collector space capable of storing ink and an air groove that guides external air into the ink tank.

9. A pen component for a writing instrument, wherein multiple thin plates are stacked on top of each other, and a minute gap-like ink channel is formed between the multiple thin plates along its entire length from the tip to the rear end, Some or all of the aforementioned thin plate material is by mass ratio Co 30.9-37.2%, Ni 31.4-33.4%, Cr 19.5-20.5%, Mo 9.5-10.5%, Mn 0.1-0.5%, Ti 0.3-0.7%, Fe 1.1-2.1%, Nb 0.8-1.2%, Rare earth metals 0.01-0.02%, and Inevitable impurities It is composed of a Co-Ni alloy having a Vickers hardness of 450 to 800 Hv, and A pen member for a writing instrument, characterized in that a portion of the rear end of the plurality of thin plates is fixed to each other while the plurality of thin plates form the ink channel, and the unfixed portions of the plurality of thin plates are elastically deformed so as to slide and displace relative to each other due to the writing pressure applied to the front ends of the plurality of thin plates.

10. The writing instrument pen member according to claim 9, wherein at least one of the outer thin sheet materials among the plurality of thin sheet materials has a slit formed at its tip that communicates with the ink channel.

11. The writing instrument pen member according to claim 9 or 10, wherein at least one of the outer thin sheet materials among the plurality of thin sheet materials has a smaller width dimension at its tip than the adjacent thin sheet material.

Images