Perpetual Pen

Abstract

To provide a fountain pen which can provide visual pleasure.SOLUTION: A fountain pen 2 includes: a pen core 10; a cylindrical barrel 20 having a neck part 22 which fits in a member including at least the pen core 10; an ink groove 12 formed at the pen core 10 and extending in an anteroposterior direction; and a comb groove 16 which is formed at the pen core 10 and in which multiple comb members 16A are arranged in the anteroposterior direction at intervals and an ink is temporarily retained in each space between the adjacent comb members 16A. In a circumferential direction of the pen core 10, an area formed with the comb groove 16 and an area formed with no comb groove 16 are provided. The ink groove 12 is disposed at a substantially center of the area formed with no comb groove 16. A portion, which covers at least the area formed with no comb groove 16, of the neck part 22 has translucency.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to a fountain pen in which ink flows through ink grooves by capillary action. [Background technology]

[0002] Some writing instruments have barrels made of transparent materials so that the ink inside can be seen from the outside. Among such writing instruments, barrels made of syndiotactic polypropylene have been proposed (see, for example, Patent Document 1). Since syndiotactic polypropylene has high transparency, the ink inside can be seen more clearly, enhancing the design effect. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-193868 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case where the writing instrument described in Patent Document 1 is a ballpoint pen, if the barrel is transparent, the ink flowing inside the ballpoint pen core can be seen from the outside. However, in the case where the writing instrument is a fountain pen, the ink in the ink storage area flows through the ink grooves by capillary action, and further flows into the comb grooves and accumulates there. For this reason, even if the barrel is transparent, there is a risk that the ink that has accumulated in the comb grooves will adhere to the inner surface of the barrel, making it difficult to clearly see the inside of the barrel. Therefore, in the case where the writing instrument is a fountain pen, the user cannot enjoy the visual pleasure.

[0005] SUMMARY OF THE PRESENT EMBODIMENTS Accordingly, an object of the present invention is to solve the above problems and to provide a fountain pen that can provide visual enjoyment. [Means for solving the problem]

[0006] A fountain pen according to one embodiment of the present invention comprises: A pen core, a cylindrical barrel having a neck portion that fits with at least a member including the pen core; an ink groove extending in the front-rear direction formed in the pen core; a comb groove formed in the pen core, the comb members being spaced apart from one another and arranged in a front-rear direction, the comb groove being capable of temporarily storing ink in a space between adjacent comb members; Equipped with a region in which the comb grooves are formed and a region in which the comb grooves are not formed in a circumferential direction of the pen core, the ink groove being disposed approximately in the center of the region in which the comb grooves are not formed, At least a portion of the neck portion that covers an area where the comb grooves are not formed has light transmittance. Effect of the Invention

[0007] The present invention provides a fountain pen that is visually pleasing. [Brief description of the drawings]

[0008] [Figure 1A] FIG. 2 is a plan view of the front area of ​​a fountain pen according to one embodiment of the present invention, seen from the rear side. [Figure 1B] FIG. 1B is a side view of the front region of the fountain pen shown in FIG. 1A. [Figure 1C] 1B is a plan view of the front region of the fountain pen shown in FIG. 1A as viewed from the abdominal side. FIG. [Diagram 2] FIG. 1B is a cross-sectional view showing section AA of FIG. 1A. [Diagram 3] FIG. 1B is a cross-sectional view showing section BB of FIG. 1A. [Figure 4] FIG. 1B is a cross-sectional view showing section CC of FIG. 1A. [Diagram 5] FIG. 11 is a plan view showing a schematic example of a case where a normal pen tip is used. [Figure 6] FIG. 13 is a plan view showing a schematic example of a pen tip having a slit extending all the way to the rear. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment for carrying out the present invention will be described with reference to the drawings. The fountain pen described below is for embodying the technical idea of ​​the present invention, and the present invention is not limited to the following unless otherwise specified. In each drawing, the same reference numerals may be used for components having the same function. In consideration of the explanation or ease of understanding of the main points, the embodiments and examples may be shown separately for convenience, but partial replacement or combination of the configurations shown in different embodiments and examples is possible. The size and positional relationship of the components shown in each drawing may be exaggerated to clarify the explanation. In this specification, "front" refers to the tip side of the fountain pen, and "rear" refers to the opposite side. The side of the pen core that is covered by the nib is called the back, and the opposite side where the comb grooves are exposed and not covered by the nib is called the abdomen. In the drawings, the back is drawn at the top and the abdomen is drawn at the bottom.

[0010] (Fountain pen according to the first embodiment of the present invention) First, a fountain pen according to one embodiment of the present invention will be described with reference to Figs. 1 to 4. Fig. 1A is a plan view of the front region of a fountain pen according to one embodiment of the present invention, seen from the rear side. Fig. 1B is a side view of the front region of the fountain pen shown in Fig. 1A. Fig. 1C is a plan view of the front region of the fountain pen shown in Fig. 1A, seen from the abdomen side. Fig. 2 is a cross-sectional view showing the section AA of Fig. 1A. Fig. 3 is a cross-sectional view showing the section BB of Fig. 1A. Fig. 4 is a cross-sectional view showing the section CC of Fig. 1A. Fig. 2 shows a cross-section at a position where a through-hole 18, which will be described later, does not exist, and Fig. 3 shows a cross-section at a position where a through-hole 18 exists.

[0011] The fountain pen 2 according to this embodiment includes a nib 4, a pen core 10 overlapped with the nib 4, and a cylindrical barrel 20 having a neck 22 that fits with a member including at least the pen core 10. In Figures 1 and 2, only the pen core 10 is shown as fitting with the neck 22, but there may also be cases where the overlapped nib 4 and pen core 10 fit with the neck 22. The pen core 10 is provided with ink grooves 12 (12A, 12B, 12C) through which ink flows by capillary action, comb grooves 16 in which multiple comb members 16A are arranged in a front-to-back arrangement with spaces between them, allowing ink to be temporarily stored in the space between adjacent comb members 16A, and an air groove 14 that supplies outside air to the ink storage area 40.

[0012] <Pen tip> The pen tip 4 has a pen point P, which is the front end that comes into contact with the paper when writing, a slit 6 that extends rearward a specified distance from the pen point P, and a hole H provided approximately in the center of the pen tip 4. The area near the pen point P is the writing area. Since the pen tip 4 requires elasticity and corrosion resistance, the body is made of a gold alloy or special steel, and a wear-resistant alloy is used for the pen point P, which comes into contact with the paper.

[0013] <Pen core> A front groove portion 12A of the ink groove 12 is formed in the back of the pen core 10, extending from the front end to the rear region. FIGS. 2 and 3 show the cross-sectional shape of the front groove portion 12A. In addition, in the rear region of the pen core 10, a connecting groove portion 12B of the ink groove 12 connected to the front groove portion 12A extends in the circumferential direction so as to connect between the back side and the abdominal side. Furthermore, a rear groove portion 12C of the ink groove 12 connected to the ink groove 12B extending in the circumferential direction extends further rearward on the abdominal side of the pen core 10. FIG. 4 shows the cross-sectional shape of the rear groove portion 12C. The rear groove portion 12C extending further rearward on the abdominal side of the pen core 10 communicates with the ink storage region 40. The ink groove 12 is formed by the front groove portion 12A, the connecting groove portion 12B, and the rear groove portion 12C, which are connected to each other.

[0014] As a result, as shown by the dotted arrows in Figures 1A to 1C, capillary action causes the ink in ink storage area 40 to flow forward through rear groove portion 12C, then from connecting groove portion 12B to front groove portion 12A, and then forward through front groove portion 12A, allowing it to flow to the writing area at the front end of the pen tip 4. A front groove portion 12A of the ink groove 12 extending in the front-rear direction provided on the back of the pen core 10 is formed at a position corresponding to a slit 6 extending in the front-rear direction provided on the pen tip 4. The ink that flows in the front groove portion 12A also flows into the slit 6 by capillary action and flows out from the pen point P at the front end onto the surface of the paper that it comes into contact with. However, the extension direction of the ink groove 12 is not limited to this. For example, the ink groove 12 may extend forward and backward along the rear side of the pen core 10 and communicate with the ink storage area 40 at the rear end.

[0015] On the abdominal side of the pen core 10, a plurality of comb members 16A are arranged in the front-rear direction at intervals, and a comb groove 16 capable of temporarily storing ink is formed in the space between adjacent comb members 16A. In this embodiment, the comb groove 16 is formed in the front-rear direction from a position overlapping with the rear end region of the pen tip 4 to just before the region in which the connecting groove portion 12B of the ink groove 12 extending in the circumferential direction is formed. In addition, the comb groove 16 is formed in about half the circumference on the abdominal side in the circumferential direction. However, this is not limited to this, and the comb groove 16 may be formed further in the circumferential direction to the back side. The range in which the comb groove 16 is formed in the circumferential direction will be described in detail later.

[0016] In addition, an air groove 14A extending in the front-rear direction is formed on the front side of the comb groove 16 on the abdominal side of the pen core 10. The air groove 14A is connected to an air groove 14B formed around the comb member 16A in the area of ​​the comb groove 16. In other words, the space between the outer circumferential surface of the comb member 16A and the inner surface of the neck portion 22 functions as the air groove 14B. The air groove 14B is connected to an air groove 14C formed on the rear side of the comb groove 16. The air groove 14C extends in the circumferential direction and connects the abdominal side and the back side. The air groove 14C is connected to an air groove 14D extending in the front-rear direction on the back side. The air groove 14D is connected to the ink storage area 40 on the rear end side. The air grooves 14A, 14B, 14C, and 14D constitute the air groove 14.

[0017] When ink in ink storage area 40 flows through ink groove 12 and flows out from pen point P of pen tip 4 to the outside, air groove 14 has the function of preventing the inside from becoming negative pressure by taking in external air and supplying it to ink storage area 40. By performing gas-liquid exchange that takes in air in an amount equivalent to the amount of ink that has flowed out, it is possible to prevent negative pressure from becoming inside ink storage area 40 and to continuously supply ink in ink storage area 40 to the writing area.

[0018] The pen core 10 can be made of a resin material, which allows the pen core 10 having the ink grooves 12, the air grooves 14 and the comb grooves 16 to be integrally molded.

[0019] <Shaft cylinder> The barrel 20 can be composed of, for example, a neck 22 located at the front and a barrel 24 located behind it. Furthermore, a separate tail plug may be provided behind the barrel 24. The neck 22 and the barrel 24 can be detachably connected by screwing or the like. An ink storage area 40 that stores ink is disposed inside the barrel 20, mainly in the barrel 24 area. In the case of a cartridge-type fountain pen, the ink storage area 40 corresponds to an ink cartridge, and in the case of a converter-type fountain pen, it corresponds to a storage section that stores bottled ink sucked by the converter. The barrel 20 can be formed, for example, from a resin material.

[0020] The pen tip 4 and the pen core 10 are overlapped and fitted into the tubular neck 22. At this time, the pen tip 4 is arranged to extend forward from the overlapping area with the pen core 10, and they are fixed to each other. The pen core 10 extends rearward from the overlapping area with the pen tip 4, and fits into the neck 22. In this case, the pen tip 4 and the pen core 10 are engaged at an engagement portion. The overlapping area of ​​the pen tip 4 and the pen core 10 can also be engaged with the neck 22. This results in a structure in which the pen tip 4 and the pen core 10 are firmly fixed to the front end of the barrel 20.

[0021] (Ink visualization) In this embodiment, the neck portion 22 has translucency. Examples of the resin material forming the neck portion 22 include polycarbonate and acrylic. From the viewpoint of increasing the transparency of the neck portion 22, it is preferable to use acrylic. Note that "having translucency" does not only mean transparent, but also means that the neck portion 22 is slightly colored to match the color of the ink, for example. Furthermore, in the circumferential direction of the pen core 10, there are areas where the comb grooves 16 are formed and areas where the comb grooves 16 are not formed, and the ink groove (front groove portion) 12A is located approximately in the center of the area where the comb grooves 16 are not formed (see Figures 2 and 3).

[0022] This allows the ink flowing in the ink groove (front groove portion) 12A to be visually observed from the outside. In particular, since the comb grooves 16 are not formed in predetermined areas on both sides of the ink groove (front groove portion) 12A, the ink stored in the comb grooves 16 does not adhere to the inner surface of the neck portion 22 and obstruct visibility, and the ink flowing in the ink groove (front groove portion) 12A can be clearly seen. This makes it possible to provide a fountain pen that provides visual enjoyment.

[0023] From the viewpoint of making the ink flowing in the ink groove (front groove portion) 12A clearly visible from the outside, it is better for the area in the circumferential direction in which the comb groove 16 is formed to be small. On the other hand, if the area in which the comb groove 16 is formed is too small, there is a risk that the comb groove 16 will not be able to store a sufficient amount of ink, and therefore it will not be possible to supply enough ink for writing. If the area where the comb grooves 16 are not formed is 180 degrees in the circumferential direction, the comb grooves 16 side will basically not be visible when visually checking the ink flowing in the ink groove (front groove portion) 12A. Therefore, it is considered that it is not necessary to make the area where the comb grooves 16 are not formed larger than 180 degrees in the circumferential direction.

[0024] On the other hand, if the comb groove 16 is located close to the ink groove (front groove portion) 12A in the circumferential direction, the ink stored in the comb groove 16 may flow along the inner surface of the neck portion 22 to above the ink groove (front groove portion) 12A, which may make it difficult to see the ink flowing in the ink groove (front groove portion) 12A. Taking these factors into consideration, it is preferable that the area in which the comb grooves 16 are not formed be an area in the circumferential direction ranging from 120 degrees to 180 degrees, more preferably an area in the range of from 135 degrees to 180 degrees, and even more preferably an area in the range of from 150 degrees to 180 degrees.

[0025] When the area where the comb grooves 16 are not formed is within the range described above, there is no risk of the ink stored in the comb grooves 16 adhering to the inner surface of the neck portion 22 and interfering with the visibility of the ink flowing through the ink grooves 12A, and sufficient ink can be supplied for writing.

[0026] 2, in this embodiment, the inner surface of the neck 22 and the outer surfaces of the pen core 10 on both sides of the ink groove (front groove portion) 12A are separated by a predetermined distance L1. In this state, the neck 22 is fitted with the pen core 10. Note that in addition to the pen core 10, the pen tip 4 may also be fitted with the neck 22, so including these, it can be said that the neck 22 is fitted with a member including at least the pen core 10. Being spaced from neck portion 22 by a predetermined distance L1 makes it possible to prevent ink flowing in ink groove (front groove portion) 12A from flowing due to capillary action onto the inner surface of neck portion 22. Here, from the viewpoint of preventing capillary action, the predetermined distance L1 is preferably 0.2 mm or more, and more preferably 0.5 mm or more.

[0027] In this way, the inner surface of the neck 22 and the outer surfaces of the pen core 10 on both sides of the ink groove (front groove portion) 12A are separated by a specified distance L1, which prevents the ink flowing in the ink groove (front groove portion) 12A from flowing due to capillary action onto the inner surface of the neck 22. Therefore, the ink flowing in the ink groove (front groove portion) 12A can be clearly seen from the outside.

[0028] As described above, the ink groove 12 is composed of the front groove portion 12A extending in the front-rear direction in the front region of the pen core 10, the rear groove portion 12C extending in the front-rear direction in a position substantially opposite the front groove portion 12A in the circumferential direction in the rear region of the pen core, and the connecting groove portion 12B extending in the circumferential direction to connect the front groove portion 12A and the rear groove portion 12C. The comb grooves 16 are formed in the region where the front groove portion 12A is formed in the front-rear direction, but the comb grooves 16 are not formed in predetermined ranges on both sides of the front groove portion 12A in the circumferential direction.

[0029] Therefore, because neck 22 is translucent, it is possible to visually observe from the outside the ink flowing from rear groove 12C, through connecting groove 12B, and into front groove 12A. Since it is possible to visually observe the ink flowing not only in the front-to-rear direction but also in the circumferential direction, further visual enjoyment can be provided.

[0030] At this time, as shown in Fig. 4, the inner surface of the neck 22 and the outer surfaces of the pen core 10 on both sides of the ink groove (rear groove portion) 12C are separated by a predetermined distance L2. In this state, the neck 22 is fitted into the pen core 10. By separating the neck 22 by the predetermined distance L2, it is possible to prevent the ink flowing in the ink groove (rear groove portion) 12C from flowing to the inner surface of the neck 22 due to capillary action. Here, the predetermined distance L2 is preferably 0.2 mm or more, and more preferably 0.5 mm or more, from the viewpoint of preventing capillary action.

[0031] The inner surface of the neck 22 and the outer surfaces of the pen core 10 on both sides of the connecting groove portion 12B of the ink groove 12 are also spaced apart by a distance similar to L2. This makes it possible to prevent the ink flowing through the connecting groove portion 12B and rear groove portion 12C of the ink groove 12 from flowing onto the inner surface of the neck 22 due to capillary action.

[0032] In the above description, the entire neck portion 22 is translucent, but this is not limiting. For example, if the ink flowing in the front groove portion 12A of the ink groove 12 is to be visible from the outside, only the region of the neck portion 22 covering the front groove portion 12A may be translucent. Similarly, if the ink flowing in the front groove portion 12A, the connecting groove portion 12B, and the rear groove portion 12C of the ink groove 12 is to be visible from the outside, only the region of the neck portion 22 covering the front groove portion 12A, the connecting groove portion 12B, and the rear groove portion 12C may be translucent.

[0033] The neck portion 22 having a portion that is translucent can be formed, for example, by forming a non-translucent region on the translucent neck portion 22 by coating, or can be molded in two colors using a translucent material and a non-translucent material.

[0034] (Through hole) In this embodiment, the ink groove 12 has a through hole 18 extending from the bottom of the front groove portion 12A to the comb groove 16 side, and the ink groove (front groove portion) 12A and the comb groove 16 communicate with each other through the through hole 18 (see FIG. 3). The ink in the ink groove 12 flows into the through hole 18 by capillary action, flows inside the through hole 18, and further flows into the space between the comb members 16A of the comb groove 16 by capillary action. In this way, the ink groove (front groove portion) 12A and the comb groove 16 communicate with each other through the through hole 18, so there is no risk of the ink flowing through the ink groove (front groove portion) 12A overflowing and adhering to the inner surface of the neck portion 22 to obstruct visibility. The ink temporarily stored in the comb groove 16 is returned to the ink groove (front groove portion) 12A through the through hole 18, so that sufficient ink can be supplied for writing.

[0035] 1A and 1C, through holes 18 are formed in each region between adjacent comb members 16A. Since through holes 18 are thus formed in each region between adjacent comb members 16A, it is possible to reliably prevent ink flowing through the ink groove (front groove portion) 12A from overflowing and adhering to the inner surface of the neck portion 22.

[0036] Furthermore, the comb member 16A may have a cutout portion that connects the spaces between the adjacent comb members 16A. The cutout portions formed in each comb member 16A may be formed at the same position in the circumferential direction and arranged linearly in the front-rear direction. However, this is not limited to this, and the cutout portions formed in each comb member 16A may be formed at different positions in the circumferential direction. In this way, when the comb member 16A has a cutout portion that connects the spaces between the adjacent comb members 16A, the ink that flows into one space between the adjacent comb members 16A flows into the space between the other comb members 16A through the cutout portion. This allows a sufficient amount of ink to be reserved in the entire comb groove 16.

[0037] When a notch is formed connecting the spaces between adjacent comb members 16A, even if through holes 18 are not formed in each region between adjacent comb members 16A, ink flows into the spaces between other comb members 16A through the notch, and it is possible to prevent the ink flowing in the ink groove (front groove portion) 12A from overflowing and adhering to the inner surface of the neck portion 22. Considering that the ink from the through holes 18 flows into the spaces between the comb members 16A by capillary action, it is preferable to form the notch at a position away from the opening of the through holes 18 in the circumferential direction.

[0038] (Fountain pens with different nib shapes) Next, a fountain pen 2 using pen tips 4, 4' of different shapes will be described with reference to Figs. <In the case of the pen tip shown in Figure 5> Fig. 5 is a plan view showing a typical example of a case where a normal pen tip is used. Fig. 5 shows a fountain pen 2 using a normal pen tip 4 having a pen point P, a slit 6 extending a predetermined length backward from the pen point P, and a hole H provided at approximately the center of the pen tip 4, similar to the above embodiment. In the case shown in Figure 5, the pen tip 4 is overlapped with the area near the pen point P protruding forward beyond the pen core 10, and the overlapped pen tip 4 and pen core 10 are fitted into the neck portion 22 and fixed to the barrel 20.

[0039] <In the case of the pen tip shown in Figure 6> Fig. 6 is a plan view showing a typical example of a pen tip with a slit extending all the way to the rear. Fig. 6 shows a fountain pen 2 using a pen tip 4' that is composed of a first region 4a and a second region 4b that are spaced apart from each other, and a connecting region 4c that connects the first region 4a and the second region 4b at the rear end. As a result, the slit 6 has a front region 6A whose width is narrowed within a predetermined range from the pen point P, and a rear region 6B whose width is wider and located behind the front region 6A. Note that the front region 6A whose width is narrowed may extend continuously from the front end of the pen tip 4' to a position reaching the connecting region 4c.

[0040] With the area of ​​the pen tip 4' near the pen point P protruding forward from the pen core 10, the pen tip 4' and the pen core 10 are overlapped, and the overlapped pen tip 4' and the pen core 10 are fitted into the hollow pen tip holding member 30 to form an assembly of the pen tip 4', the pen core 10, and the pen tip holding member 30 that are fixed to each other. The pen tip 4' (mainly the connecting area 4c) and the pen core 10 extend rearward from the pen tip holding member 30, and the area of ​​the pen tip 4' and the pen core 10 that extends rearward from the pen tip holding member 30 is fitted into the neck portion 22 of the cylindrical barrel 20. This allows the assembly of the pen tip 4', the pen core 10, and the pen tip holding member 30 to be securely attached to the neck portion 22 of the barrel 20.

[0041] 6, the pen tip pressing member 30 that fits with the superimposed pen tip 4' and pen core 10 is translucent. Therefore, since the slit 6 extends continuously long to the rear of the pen tip 4, the ink flowing in the ink groove (front groove portion) 12A can be seen through the slit 6 even in the area of ​​the pen core 10 covered by the pen tip 4. This provides visual enjoyment not only in the area of ​​the neck portion 22 but also in the area of ​​the pen tip 4.

[0042] As described above, the fountain pen 2 according to the embodiment includes the pen core 10, the cylindrical barrel 20 having the neck 22 that fits with at least the member including the pen core 10, the ink groove 12 extending in the front-rear direction formed in the pen core 10, and the comb groove 16 formed in the pen core 10, in which a plurality of comb members 16A are arranged in the front-rear direction at intervals, and in which ink can be temporarily stored in the space between adjacent comb members 16A, and in the circumferential direction of the pen core 10, there are areas where the comb grooves 16 are formed and areas where the comb grooves 16 are not formed, the ink groove 12 is located approximately in the center of the area where the comb grooves 16 are not formed, and at least the part of the neck 22 that covers the area where the comb grooves 16 are not formed is translucent. This makes it possible to provide a fountain pen that provides visual enjoyment.

[0043] The fountain pen according to the present invention is not limited to the above embodiment, and includes any other writing instrument having a hollow barrel. Although the embodiment and the mode of implementation of the present invention have been described, the disclosed contents may be changed in the details of the configuration, and the combination and order of elements in the embodiment and the mode of implementation may be changed without departing from the scope and idea of ​​the claimed invention. [Explanation of symbols]

[0044] 2 fountain pen 4, 4' nib 4a First Area 4b The second area 4c Connecting Area 6 Slit 6A Anterior area 6B Posterior area 10 Pen nibs 12 Ink fountain 12A Front groove 12B Connection groove 12C Posterior groove 14 Air Groove 14A, 14B, 14C, 14D Air groove 16 Comb groove 16A Comb component 20 shaft cylinder 22 Neck 24 Torso axis 30 Pen tip holder 40 Ink storage area P Pen Point H hole

Claims

1. A pen core, a cylindrical barrel having a neck portion that fits with at least a member including the pen core; an ink groove extending in the front-rear direction formed in the pen core; a comb groove formed in the pen core, the comb members being spaced apart from one another and arranged in a front-rear direction, the comb groove being capable of temporarily storing ink in a space between adjacent comb members; Equipped with a region in which the comb grooves are formed and a region in which the comb grooves are not formed in a circumferential direction of the pen core, the ink grooves being disposed approximately in the center of the region in which the comb grooves are not formed, A fountain pen characterized in that at least a portion of the neck covering an area where the comb grooves are not formed is translucent.

2. 2. The fountain pen according to claim 1, wherein the region where the comb grooves are not formed is a region in a range of 150 degrees or more and 180 degrees or less in the circumferential direction.

3. a through hole extending from a bottom of the ink groove toward the comb groove, 3. The fountain pen according to claim 1, wherein the ink groove and the comb groove communicate with each other via the through hole.

4. 4. The fountain pen according to claim 3, wherein the through holes are formed in each area between adjacent comb members.

5. 4. The fountain pen according to claim 3, wherein the comb members are formed with cutouts that connect the spaces between the adjacent comb members.

6. A fountain pen as described in any one of claims 1 to 5, characterized in that the neck is fitted with a member including at least the pen core, with the inner surface of the neck and the outer surfaces of the pen core on both sides of the ink groove being spaced apart by a predetermined distance.

7. the ink groove is composed of a front groove portion extending in the front-rear direction in a front region of the pen core, a rear groove portion extending in the front-rear direction in a rear region of the pen core at a position substantially opposite to the front groove portion in the circumferential direction, and a connecting groove portion extending in the circumferential direction so as to connect the front groove portion and the rear groove portion, The comb groove is formed in a region in which the front groove portion is formed in the front-rear direction, 7. The fountain pen according to claim 1, wherein an area of ​​the neck covering the front groove, the connecting groove and the rear groove is translucent.

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