Pen structure, ballpoint pen, and touch pen

Abstract

To provide a pen structure which is easy to switch colors and functions, and makes it easy to write without interfering when writing.SOLUTION: A pen structure S of the present invention comprises: a pen holder 10 held by the hand; and a plurality of pen nibs 11a-11c arranged at one end of the pen holder 10, the plurality of pen nibs 11a-11c being oriented to open outward from a direction along axes of the pen holder 10. Moreover, it is preferable to further have one or more pen nibs 12 or erasers 13 arranged at the other end of the pen holder 10.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a pen structure, a ballpoint pen, and a touch pen having multiple pen tips. [Background technology]

[0002] Multicolor ballpoint pens have been known for some time. These ballpoint pens use a knock mechanism or a rotary mechanism to select and project each color one by one. While some proposals have been made to combine multiple pens so that the pen tip is always exposed and no knocking or rotary projection is required, most of these have straight pen shafts arranged parallel to each other (see, for example, Patent Document 1 for a rotary projection mechanism). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Publication No. 60-120886 Summary of the Invention [Problem to be solved by the invention]

[0004] Most of these conventional multi-color ballpoint pens use a knock mechanism to push out the required color from the multi-colored ballpoint pen refills, or a twist mechanism to advance the color. Of these, most knock mechanism pens tend to have thick pen barrels. Furthermore, because you have to change the pen and knock or twist it every time you want to change colors, operation is cumbersome when frequently using different colors for purposes such as schedule management or study. Furthermore, the knock mechanism frequently generates a switching sound when changing colors, which can be a source of frustration for those around you, especially in the workplace, at a client's office, or in a meeting.

[0005] In addition, there were some pens that had multiple exposed nibs without using a knock mechanism, but these only had two nibs and the two pen shafts were parallel, which meant that the nibs could only be spaced apart slightly, causing problems such as interference with nibs of other colors when writing or making the pen shaft thicker.

[0006] Other proposals have included a system in which multiple pen barrels are pushed out simultaneously and fixed together at one point, but the nibs are hidden behind the body when writing, making them difficult to see, and the nibs of each color are close together at small angles, causing interference between colors when writing. Even with the knock mechanism, there are also designs that use rubber or similar to reduce switching noise, but the effort of knocking and changing hands when switching still remains.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a pen structure that allows for easy switching of colors and functions and allows for easy writing without interference when writing. [Means for solving the problem]

[0008] In order to achieve the above object, the pen structure of the present invention comprises a pen body that is held by hand, and a plurality of pen tips that are arranged at one end of the pen body and are oriented so as to open outward from a direction along the axial line of the pen body.

[0009] In addition, the ballpoint pen of the present invention has the pen structure described above, and is equipped with a plurality of core holes formed at one end of the pen barrel, which are oriented so as to open outward from a direction along the axial line of the pen barrel, and a plurality of colored cores as pen tips which are inserted into the plurality of core holes, respectively.

[0010] Furthermore, the touch pen of the present invention has the above-mentioned pen structure and includes a plurality of touch pen tips arranged at one end of the pen shaft, and oriented so as to open outward from a direction along the axial line of the pen shaft. [Effects of the Invention]

[0011] Thus, the pen structure of the present invention comprises a pen barrel that is held by hand, and a plurality of pen tips disposed at one end of the pen barrel, the plurality of pen tips being oriented so as to open outward from the direction along the axial line of the pen barrel. This configuration allows for easy operation of switching colors and functions, and provides a pen structure that is easy to write with without interference.

[0012] The ballpoint pen of the present invention has the above-described pen structure, and includes a plurality of core holes formed at one end of the pen barrel, the core holes being oriented so as to open outward from the direction along the axial line of the pen barrel, and a plurality of colored cores as a plurality of pen tips inserted into the core holes, respectively. With this configuration, the ballpoint pen is easy to switch colors and functions, and is easy to write with without interference when writing.

[0013] Furthermore, the touch pen of the present invention has the above-described pen structure and includes a plurality of touch pen tips arranged at one end of the pen barrel, the plurality of touch pen tips being oriented so as to open outward from the direction along the axial line of the pen barrel. With this configuration, the touch pen can be easily switched between colors and functions, and can be easily written without interference. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a plan view illustrating the overall configuration of a ballpoint pen according to a first embodiment. [Figure 2] FIG. 1 is a side view of a ballpoint pen according to a first embodiment. [Figure 3] FIG. 1 is a front view of a ballpoint pen according to a first embodiment. [Figure 4] 1A and 1B are cross-sectional views of the ballpoint pen of Example 1. (a) is a cross-sectional view taken along line AA in FIG. 1, (b) is a cross-sectional view taken along line BB in FIG. 1, and (c) is a cross-sectional view taken along line CC in FIG. [Figure 5] FIG. 2 is an enlarged cross-sectional view illustrating the configuration of the vicinity of the tip of the ballpoint pen of Example 1. [Figure 6] FIG. 10 is a side view illustrating the overall configuration of the touch pen of Example 2. [Figure 7] 10A and 10B are perspective views illustrating the structure of a pen according to Example 3. (a) is a perspective view, and (b) is a front view. [Figure 8] 10A to 10C are diagrams illustrating the operation of the pen structure of the third embodiment. [Figure 9] 10A and 10B are explanatory diagrams illustrating the structure of the pen of Example 4. (a) is a front view, and (b) is a conceptual diagram illustrating the position of the pen tip. [Figure 10] 10A and 10B are diagrams illustrating the operation of the pen structure of the fourth embodiment. [Figure 11] FIG. 10 is an explanatory diagram illustrating the shape of the pen structure of the fifth embodiment. [Figure 12] FIG. 10 is a front view illustrating the structure of the pen of the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the components described in the following embodiments and examples are merely examples, and are not intended to limit the technical scope of the present invention. [Example]

[0016] (composition) First, the configuration of a multicolor ballpoint pen 2 equipped with a pen structure S of the present invention will be described using Figures 1 and 2. As shown in Figures 1 and 2, the pen structure S included in the ballpoint pen 2 of this embodiment includes a pen barrel 10 held by hand and a plurality of pen tips 11a-11c disposed at one end of the pen barrel 10, each of which includes color cores 22a-22c as the pen tips 11a-11c, which are oriented so as to open outward from a direction along the axial line of the pen barrel 10. As will be described later, these pen tips 11a-11c are oriented so as to be spaced apart from each other toward their respective tips. These color cores 22a-22c are of different colors, and may be, for example, light blue, blue, red, or black.

[0017] For example, the first pen tip 11a at the tip side is bent from the base end side toward the tip side (from right to left in FIG. 2) so as to open outward from the direction along (parallel to) the axial line of the pen barrel 10 (the straight line connecting the centers of the circular cross sections). The second pen tip 11b and the third pen tip 11c have a similar configuration. As a result, the first to third pen tips 11a to 11c are oriented so as to be spaced apart from each other.

[0018] Furthermore, the pen structure S of this embodiment further includes a color core 24 as one (or more) pen tips 12 arranged at the other end of the pen barrel 10. The fourth pen tip 12 is also oriented so as to open outward from the direction along the axial line of the pen barrel 10, similar to the first to third pen tips.

[0019] In other words, the fourth pen tip 12 on the base end side is bent so as to open outward from the direction along (parallel to) the axial line of the pen body 10 (the straight line connecting the centers of the circular cross sections) from the tip end side to the base end side (from left to right in Figure 2).

[0020] The pen structure S of this embodiment further includes an eraser 13 located at the other end of the pen shaft 10. Here, the eraser 13 can be a normal so-called sand eraser, or, if using ink that fades when heated, a member that generates frictional heat can also be used.

[0021] Specifically, as shown in Figures 4 and 5, the multi-color (four-color) ballpoint pen 2 having the pen structure S of this embodiment comprises three core holes 21a-21c formed at one end of the pen barrel 10, the three core holes 21a-21c being oriented so as to open outward from the direction along the axial line of the pen barrel 10, and three color cores 22a-22c as three pen tips (11a-11c) inserted into the three core holes 21a-21c, respectively. The three color cores 22a-22c are formed to have a length approximately half that of the pen barrel 10.

[0022] In addition, the ballpoint pen 2 further includes a color lead 24 as a pen tip 12 located at the other end of the pen barrel 10. This color lead 24 is formed to have a length that is approximately half the length of the pen barrel 10. The outer diameter of each color lead 22a (22b, 22c, 24) is determined to be approximately the same as (actually slightly smaller than) the inner diameter of the corresponding core hole 21a. Furthermore, because the color leads 22a to 22c of the ballpoint pen 2 are stored compactly near the center of the pen barrel 10, the pen barrel 10 can be made slim and easy to hold.

[0023] More specifically, as shown in Figures 4(a) and (b), three core holes 21a to 21c are formed at the tip side of the pen body 10, and each core hole 21a (21b, 21c) is formed so as to curve from a position closer to the center of the cross section to a position farther away as it moves toward the tip side.

[0024] When viewed in a cross section cut along the axial line, it curves outward from the direction along the central axis toward the tip, as shown in Figure 5. Looking at it from another perspective, a conical (wedge-shaped; cone-shaped) region remains near the end of the pen body 10, and this remaining conical region separates the pen tips 11a to 11c from one another so that they open outward (a "wedge-shaped support mechanism").

[0025] On the other hand, as shown in Figure 4(c), a single core hole 23 is formed at the base end of the pen barrel 10, and the core hole 23 is formed so as to curve from a position closer to the center of the cross section to a position farther away as it approaches the base end. When viewed in a cross section cut along the axial line, it curves outward from the direction along the central axis toward the base end (not shown).

[0026] Therefore, the color lead 22a inserted into the lead hole 21a is bent to fit the shape of the lead hole 21a, and is pressed against the inner surface of the lead hole 21a by the elastic force of the color lead 22a itself. Therefore, the frictional force between the color lead 22a and the lead hole 21a prevents the color lead 22a from slipping out of the lead hole 21a even without a special fastener. Of course, the color lead 22a can be pulled out of the lead hole 21a by pulling it with a strong force.

[0027] As shown in the front view of Fig. 3, the color leads 22a-22c serving as the pen tips each have three lead holes 21a-21c and three (three) color leads 22a-22c, and the color leads 22a-22c are arranged at angular intervals of 120 degrees in the circumferential direction. In other words, the three color leads 22a-22c are arranged at positions where the positions of their tips are rotationally symmetrical (shifted by 120 degrees) with respect to the axial line.

[0028] Therefore, when actually using the ballpoint pen 2, the color cores 22a to 22c can be changed to a different color by an extremely simple operation of holding the pen barrel 10 with one's fingers and rotating it forward or backward by 120 degrees. For example, a color change can be made from light blue color core 22a to red color core 22c by rotating it forward (clockwise when viewed from the front), and a color change can be made from light blue color core 22a to blue color core 22b by rotating it backward.

[0029] Furthermore, the colored lead 22a (22b, 22c) is pressed against the lead hole 21a (21b, 21c) over a wide area, not just near the outlet, so the writing point at the tip of the colored lead 22a (22b, 22c) is stable, resulting in little shaking and an extremely easy-to-write ballpoint pen 2. In addition, when actually writing, the writing lead 22a is placed downward, but in this state the tips of the remaining two colored leads 22b, 22c do not overlap, making the writing point extremely easy to see and making writing easy.

[0030] Furthermore, although not limited to this, it is also a preferred embodiment that the core hole 21a (21b, 21c) has a curved shape that curves more sharply toward the tip exit (such as a clothoid curve). By gradually increasing the curvature toward the opening of the core hole 21a in this way, the colored lead 22a (22b, 22c) is pressed against the core hole 21a (21b, 21c) over a wide area, but is pressed most strongly near the exit. This further increases the fixation of the colored lead 22a (22b, 22c) near the exit. This stabilizes the writing point of the pen tip (i.e., shortens the length of the free end), resulting in less wobble and an extremely easy-to-write ballpoint pen.

[0031] (effect) Next, the effects of the ballpoint pen 2 having the pen structure S of this embodiment will be listed and explained.

[0032] (1) As described above, the pen structure S of this embodiment includes a pen body 10 that is held by hand, and a plurality of pen tips 11a-11c that are disposed at one end of the pen body 10 and are oriented so as to open outward from a direction along the axial line of the pen body 10. This configuration results in a pen structure that allows for easy switching of colors and functions and facilitates writing without interference. In other words, the pen structure S of this embodiment allows writing with different colors exposed, one by one, without interference.

[0033] (2) Furthermore, by further providing one or more pen tips 12 at the other end of the pen body 10, it is possible to provide a greater variety of colors and functions using a greater number of pen tips 12. The ability to use both ends of the pen body 10 in this way is due to the extremely simple configuration of the pen structure S of the present invention.

[0034] (3) Furthermore, by providing an eraser 13 at the other end of the pen holder 10, if you make a mistake, you can quickly erase the mistake by turning the pen holder 10 over.

[0035] (4) The ballpoint pen 2 of this embodiment is a ballpoint pen 2 having any of the pen structures S described above, and is provided with a plurality of core holes 21a to 21c formed at one end of the pen barrel 10, the core holes 21a to 21c being oriented so as to open outward from a direction along the axial line of the pen barrel 10, and a plurality of color cores 22a to 22c as a plurality of pen tips inserted into the plurality of core holes 21a to 21c, respectively.

[0036] With this configuration, the ballpoint pen 2 can be easily switched between the color leads 22a to 22c and can be written easily without interference. In other words, with the ballpoint pen 2 of this embodiment, different colors can be written one by one without interference while keeping the different colors exposed. Furthermore, this simple configuration with the lead hole 21a and the color lead 22a simplifies the structure, which has the effect of allowing the pen body 10 to be made thinner. Therefore, the multi-color ballpoint pen 2 of the present invention is extremely easy to hold and write with.

[0037] In addition, the ballpoint pen 2 is intended for use on a desk or carried in a notebook or diary, but even if the pen tip is always exposed and fixed, the angle of each color tip 22a to 22c of the beveled ballpoint pen 2 according to the present invention is slight from the center of the pen shaft, so the paper will not be soiled when carried around. Furthermore, the pen tip is slightly widened when carried in a notebook or diary, so it does not slip off and is less likely to roll when placed on a desk.

[0038] Furthermore, unlike conventional multicolor ballpoint pens with a knock mechanism for each color, the ballpoint pen 2 of the present invention is a multicolor ballpoint pen that does not generate any knocking noise or interference noise or vibration between parts when changing colors. Even if a mechanism is provided in the future that exposes all colors with a single knock and retracts them back into the main body, no knocking noise will be generated when changing colors (although a knocking noise will be generated when moving forward and backward).

[0039] (5) Furthermore, the pen has three core holes 21a-21c and three color cores 22a-22c, and the color cores 22a-22c are arranged at 120-degree intervals in the circumferential direction. Therefore, you can easily switch to a different color by simply rotating the pen body 10 forward or backward by 120 degrees. Furthermore, with three cores, the pen tips are less likely to overlap when writing, making it easier to write. Conversely, with four or more cores, the pen tips overlap, making it difficult to write.

[0040] (6) Furthermore, it is preferable that the color leads 22a to 22c are inserted into the core holes 21a to 21c so as to be able to move back and forth, and that a moving mechanism be further provided for simultaneously moving all of the color leads 22a to 22c forward and backward. Specifically, a so-called "knock cam mechanism" consisting of a "cam body (external cam)," a "knock rod," and a "rotor" can be used as such a moving mechanism. [Example]

[0041] A touch pen 3 having the pen structure S of the present invention will be described below with reference to Fig. 6. Note that parts that are the same as or equivalent to those described in the first embodiment will be described with the same reference numerals.

[0042] (composition) First, the configuration of a touch pen 3 having a pen structure S of the present invention will be described using Figure 6. As shown in Figure 6, the pen structure S included in the touch pen 3 of this embodiment comprises a pen body 10 that is held in the hand, and a plurality of touch pen tips 32a-32c that are arranged at one end of the pen body 10 and are oriented so as to open outward from a direction along the axial line of the pen body 10. As will be described later, these touch pen tips 32a-32c are oriented so as to be spaced apart from each other toward their respective tips.

[0043] Specifically, as shown in Fig. 6, the touch pen 3 having the pen structure S of this embodiment comprises a plurality of core holes 31a-31c formed at one end of the pen barrel 10, the core holes 31a-31c being oriented so as to open outward from a direction along the axial line of the pen barrel 10, and a plurality of touch pen tips 32a-32c as a plurality of pen tips (11a-11c) to be inserted into the core holes 31a-31c, respectively. Of these, the outer diameter of the shaft of the touch pen tip 32a is determined to be substantially the same as (actually, slightly smaller than) the inner diameter of the corresponding core hole 31a.

[0044] (effect)

[0045] (1) As described above, the touch pen 3 of this embodiment is a touch pen 3 having the above-described pen structure S, and is provided with a plurality of touch pen tips 32a to 32c arranged at one end of the pen shaft 10, and oriented so as to open outward from the direction along the axial line of the pen shaft 10. With this configuration, it is possible to change the color and Line types and The touch pen 3 allows for easy function switching and is easy to write with without interference. In other words, with the touch pen 3 of this embodiment, it is possible to write with each color (for each line type or function) without interference while leaving different colors (line types or functions) exposed.

[0046] (2) Furthermore, the pen is provided with three touch pen tips 32a to 32c, which are arranged at 120-degree intervals in the circumferential direction, so that by simply rotating the pen shaft 10 120 degrees forward or backward, it is possible to easily switch to a different color, line type, or function.

[0047] The other configurations and effects are substantially the same as those in the first embodiment, and therefore the description thereof will be omitted. [Example]

[0048] 7 and 8, a pen structure S different from those in Examples 1 and 2 will be described below. Note that the same or equivalent parts as those in Examples 1 and 2 will be denoted by the same reference numerals.

[0049] (composition) First, we will explain the configuration of a ballpoint pen (2) having the pen structure S of this embodiment. Although not shown, the ballpoint pen (2) is similar to embodiments 1 and 2, and includes three core holes 21a to 21c formed at one end of a pen barrel 10, the three core holes 21a to 21c oriented so as to open outward from a direction along the axial line of the pen barrel 10, and three color cores (22a to 22c) as three pen tips (11a to 11c) inserted into the three core holes 21a to 21c, respectively.

[0050] In the pen structure S of this embodiment, as shown in Figures 7(a) and 7(b), the cross section of the pen barrel 10 is circular, and the circumferential portions adjacent to the positions of the multiple pen tips (color cores; 22a-22c) are chamfered to form multiple flat surfaces 25a-25c. That is, in this pen structure S, the flat surfaces 25a-25c are formed with their centers at the same circumferential angle as the circumferential angle of the centers of the core holes 21a-21c of the ballpoint pen (2). In cross section, the radius passing through the centers of the core holes 21a-21c passes through the midpoints of the chords that make up the flat surfaces 25a-25c. However, only two or one of the three flat surfaces 25a-25c may be chamfered.

[0051] 7(b), the midpoint (center line) of flat surface 25a has the same circumferential angle as core hole 21a. Similarly, the midpoints (center lines) of flat surfaces 25b and 25c have the same circumferential angle as core holes 25b and 25c.

[0052] (Actions and Effects) Next, the operation of a ballpoint pen (2) equipped with the pen structure S of this embodiment will be described with reference to Figures 8(a) to 8(c). As shown in Figure 8(a), when writing with the color lead 22a (for example, red), the pen structure S has one flat surface 25a facing directly downward (at the 6 o'clock position), while the other two flat surfaces 25c and 25b are positioned at the 10 o'clock and 2 o'clock positions, facing diagonally upward. Therefore, when writing with the color lead 22a, the pen body 10 can be stably held by pressing the flat surface 25a with the middle finger and the flat surfaces 25c and 25b with the index finger and thumb, respectively.

[0053] Next, as shown in Fig. 8(b), when writing with the color lead 22b (e.g., blue), the pen is rotated clockwise from the state shown in Fig. 8(a) while placing fingers on the flat surfaces 25a-25c. This causes one flat surface 25b to face directly downward (the 6 o'clock position), while the other two flat surfaces 25a and 25c are positioned at the 10 o'clock and 2 o'clock positions, facing diagonally upward. Therefore, when writing with the color lead 22b, the pen body 10 can be stably held at three points by pressing the flat surface 25b with the middle finger and the flat surfaces 25a and 25c with the index finger and thumb, respectively.

[0054] Similarly, as shown in Figure 8(c), when writing with color lead 22c (e.g., black), from the state shown in Figure 8(b), the pen is rotated clockwise while placing fingers on flat surfaces 25a-25c. This causes one flat surface 25c to face directly downward (6 o'clock position), while the other two flat surfaces 25b and 25a are positioned at the 10 o'clock and 2 o'clock positions, facing diagonally upward. Therefore, when writing with color lead 22c, the pen body 10 can be stably held at three points by pressing flat surface 25c with the middle finger and flat surfaces 25b and 25a with the index finger and thumb, respectively.

[0055] In this way, when the pen barrel 10 has three color cores 22a-22c, forming three flat surfaces 25a-25c makes it easy to rotate the pen barrel 10 while holding it with your fingers, and allows for stable positioning. In particular, when the pen barrel 10 is thin, it is difficult to make delicate angle adjustments with your fingertips, but by chamfering the edges, it becomes possible to actively guide the pen angle to a predetermined position (angle).

[0056] As described above, in the pen structure S of this embodiment, the cross section of the pen body 10 is formed into a circle, and one or more chamfers are formed on the circumferential portion adjacent to each of the multiple pen tips (11a-11c) to form one or more flat surfaces 25a-25c. With this configuration, the pen body 10 can be easily rotated while being held with the fingers, and can be stably positioned.

[0057] The other configurations and effects are substantially the same as those in the first embodiment, and therefore the description thereof will be omitted. [Example]

[0058] Next, a pen structure S different from those in Examples 1 to 3 will be described with reference to Figures 9 and 10. Note that parts that are the same as or equivalent to those in Examples 1 to 3 will be described with the same reference numerals.

[0059] (composition) First, the configuration of the pen structure S of this embodiment will be described using Figures 9(a) and (b). In the pen structure S of this embodiment, as shown in Figure 9(a), the cross section of the pen body 10 is formed into an ellipse. In other words, unlike ordinary pens and ballpoint pens, it is not circular (perfectly circular), but is elliptical with a major axis L1 and a minor axis L2. Specifically, it is preferable that the ratio of major axis L1:minor axis L2 = (1.04 to 1.20):1.00. More preferably, it is preferable that the ratio of major axis L1:minor axis L2 = (1.05 to 1.10):1.00.

[0060] Furthermore, the multiple pen tips 11a-11c are arranged at at least one of the positions of one vertex P1 on the major axis L1 side of the ellipse and two intermediate points P3, P3' between the two vertices P2, P2' on the minor axis L2 side of the ellipse and the other vertex P1' on the major axis L1 side. In this embodiment, pen tips 22a, 22b, and 22c are arranged at all three points: one vertex P1 and intermediate points P3, P3'. In the case of Figure 9(a), these intermediate points P3 and P3' can be determined as positions 240 degrees (P3; third quadrant; 22b) and 300 degrees (P3'; fourth quadrant; 22c) from the center of the ellipse, for example.

[0061] (Actions and Effects) Thus, the pen structure S of this embodiment is a pen structure S with a slightly elliptical cross section, adjusted so that the three pen tips 22a-22c are positioned in predetermined positions. This ellipse contacts the gap between the triangle formed by the fingertip at three points, just like a circle. However, as shown in Figures 10(a)-10(c), the ellipse allows the inscribed ellipse to be highly fixed at positions where the bisectors of each angle of the triangle and the major axis L1 of the ellipse overlap. That is, the degree of fixation of the inscribed ellipse by the fingertip is high when the major axis L1 of the ellipse is tilted 60 degrees from the vertical with the pen tip 22b facing downward (see Figure 10(a)), when the major axis L1 of the ellipse is vertical with the pen tip 22a facing downward (see Figure 10(b)), or when the major axis L1 of the ellipse is tilted 60 degrees from the vertical with the pen tip 22c facing downward (see Figure 10(c)).

[0062] In each of these highly fixed states, by positioning the pen tips 22a-22c so that they face the paper, it is possible to instantly stop rotation at a stable angle where the selected pen tip 22a (22b, 22c) faces the paper. This shape is particularly suitable for standard-sized or thick pen barrels. The large outer diameter makes it easier to rotate, making it suitable for long periods of writing, such as design work on a desk, and is less tiring than the pen structure S of Example 3 (shape with a flat surface; chamfered shape).

[0063] As described above, the pen structure S of this embodiment has an elliptical cross section of the pen shaft 10, which allows the pen shaft 10 to be held more stably than if it were circular, and allows the pen shaft 10 to be held in a position with a higher degree of fixation.

[0064] Furthermore, the multiple pen tips 22a to 22c are positioned at at least one of the positions of one vertex P1 on the major axis L1 side of the ellipse and two intermediate points P3, P3' between the two vertices P2, P2' on the minor axis L2 side of the ellipse and the other vertex P1' on the major axis L1 side. Therefore, by positioning the pen tips 22a to 22c at positions with a high degree of fixation, it is possible to instantly stop the rotation of the selected pen tip 22a to 22c at a stable angle facing the paper surface.

[0065] The other configurations and effects are substantially the same as those in the first embodiment, and therefore the description thereof will be omitted. [Example]

[0066] Next, a pen structure S different from those of Examples 1 to 4 will be described with reference to Figures 11 and 12. Note that the same or equivalent parts as those described in Examples 1 to 4 will be denoted by the same reference numerals.

[0067] (composition) First, the configuration of the pen structure S of this embodiment will be described using Figures 11 and 12. In the pen structure S of this embodiment, as shown in Figures 11 and 12, the cross-sectional shape of the pen shaft 10 is formed to have an outline formed by rotating three identical ellipses 101 to 103 by 120 degrees and superimposing them, and the pen tips 22a, 22b, and 22c are located at three positions Pa, Pb, and Pc where the ellipses intersect. Note that the centers of these three ellipses 101 to 103 may be shifted from one another so that they form the vertices of an equilateral triangle.

[0068] That is, the cross-sectional shape of this embodiment, which is made up of three overlapping ellipses, can also be called a "rice ball shape" or a "rounded equilateral triangle." Specifically, as shown in Fig. 11, the outer shape of the pen body 10 is defined by overlapping an ellipse 102 whose major axis L1 is vertical, an ellipse 101 whose major axis L1 is tilted -60 degrees from the vertical, and an ellipse 103 whose major axis L1 is tilted +60 degrees from the vertical. The shape is relatively flat, centered at the 8 o'clock (-120 degrees), 0 o'clock (0 degrees), and 4 o'clock (+120 degrees) positions, and the pen tips 22b, 22a, and 22c are located at these three positions.

[0069] Thus, in the pen structure S of this embodiment, the cross-sectional shape of the pen body 10 is a triangular rice ball shape formed by stacking three slightly flattened ellipses rotated 120 degrees each. The three pen tips 22a-22c are positioned in a balanced manner so that the outlines of the ellipses 101-103 overlap on the major axis L1 of each ellipse.

[0070] (Actions and Effects) This makes it easier to stop the pen when the indentation on the paper side of the pen reaches the position of your middle finger. At this time, your thumb and index finger will also stop, hooking into the indentations at the shoulders of the rice ball shape. The next time you rotate the pen, there are bulges on either side of the thumb and index finger, so by hooking your fingers there, it is easier to start the rotation on either side.

[0071] There are only slight bulges and depressions, and the entire outer circumference of the pen body 10 is smoothly rounded, so rotation is not hindered. This shape is also suitable for normal-sized or thick pen bodies, and its large outer diameter makes it easier to rotate, and since it is closer to a circle than a single oval, it can be handled without any discomfort as a pen body 10. This shape is particularly less tiring when writing for long periods of time, such as when designing at a desk.

[0072] As described above, the pen structure S of this embodiment is formed so that the cross section of the pen body 10 has an outline formed by rotating three identical ellipses 101 to 103 by 120 degrees and superimposing them on top of each other, and the pen tips 22a, 22b, and 22c are positioned at three positions Pa, Pb, and Pc where the ellipses 101 to 103 intersect, making it easy to rotate the pen body 10 and keep it in the appropriate position.

[0073] The other configurations and effects are substantially the same as those in the first embodiment, and therefore the description thereof will be omitted.

[0074] (summary) According to the pen structure S of Examples 3 to 5, the selected pen tip (22a, 22b, 22c) can be instantly and steadily pointed toward the paper surface without impairing the ease of rotation of the pen shaft 10.

[0075] The three types of cross-sectional shapes (grip shapes) of the pen body 10 of Examples 3 to 5 can be used depending on the pen model lineup, allowing for shapes suited to each design and function. For example, if a pen body is also placed at the rear end of the pen body, the oval shape of Example 4 can be used to comfortably accommodate a large number of pen cores within the pen body. Example 3 is suitable for pens with a thinner body, such as those used for notebooks, while Example 5 is suitable for pens with a thicker body that are less tiring to use when working at a desk for longer periods of time.

[0076] By adhering to this principle of the cross-sectional shape (grip shape) of the pen body 10, it is possible to make a pen with multiple nibs easy to handle. In particular, compared to the typical circular shape of the pen body 10, the side is carved or recessed, which makes it possible to reduce the amount of material used while realizing an easy-to-use shape.

[0077] Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes that do not deviate from the gist of the present invention are included in the present invention.

[0078] For example, in Example 1, we have described a ballpoint pen 2 in which all pen tips are colored tips, and in Example 2, we have described a touch pen 3 in which all pen tips are touch pen tips, but this is not limited to this.For example, one end may be a colored tip and the other end may be a touch pen tip, or two at one end may be colored tips and one may be a touch pen.

[0079] In addition, in Example 1, the color cores 21a to 21c, 24 are described as being formed to a length of approximately half the length of the pen body 10, but this is not limited to this, and they can also be formed to the same length as the entire length of the pen body 10 as long as they do not interfere with the structure of the other end.

[0080] Furthermore, by arranging the three pen core holes 21a to 21c on the tip side (left side) and the core hole 23 on the base side (right side) so that they overlap in the cross section (for example, by forming a right-handed core hole 23 in the center), it is possible to construct a four-color pen with a short overall length of the pen shaft 10.

[0081] Furthermore, while the embodiments have been described with reference to a standard pen grip, this is not limiting. For example, a pen may be held with the thumb extended straight. In such a case, the triangle formed by the three fingers will be an inverted triangle relative to the paper surface. To address this, the chamfered portion of the original model can be rotated by 60 degrees, so that the chamfered portion becomes convex and the non-chamfered portion becomes concave (chamfered). [Explanation of symbols]

[0082] S Pen structure P1 First vertex P2 Second vertex P3 midpoint L1 long axis L2 short axis 10 Pen holder 101-103 oval 11a, 11b, 11c Pen tip (tip side) 12 Pen tip (base end) 13 Eraser 2 ballpoint pens 21a, 21b, 21c core hole 22a, 22b, 22c color core 23 Core hole (base end side) 24 Color core (base end) 25a-25c flat surface 3 Touch pen 31a, 31b, 31c core hole 32a, 32b, 32c Touch pen nibs 33 Core hole (base end side) 34 Touch pen tip (base end) 35 Eraser

Claims

1. a pen holder held by hand; a plurality of pen tips disposed at one end of the pen barrel, the three pen tips being oriented so as to open outward from a direction along an axial line of the pen barrel; Equipped with The cross section of the pen barrel is formed in an elliptical shape, A pen structure in which the three pen tips are arranged at one vertex on the long axis side of the ellipse, and at two midpoints between the two vertices on the short axis side of the ellipse and the other vertex on the long axis side.

2. a pen holder held by hand; a plurality of pen tips disposed at one end of the pen barrel, the plurality of pen tips being oriented so as to open outward from a direction along an axial line of the pen barrel; The cross section of the pen shaft is formed to have an outline formed by overlapping three identical ellipses rotated 120 degrees each, and the pen tip is located at the three positions where the ellipses intersect.

3. A ballpoint pen comprising the pen structure of claim 1, The ballpoint pen comprises three core holes formed at one end of the pen shaft, the three core holes being oriented so as to open outward from a direction along the axial line of the pen shaft, and three colored cores as three pen tips inserted into the three core holes, respectively.

4. A ballpoint pen comprising the pen structure of claim 2, The ballpoint pen comprises three core holes formed at one end of the pen shaft, the three core holes being oriented so as to open outward from a direction along the axial line of the pen shaft, and three colored cores as three pen tips inserted into the three core holes, respectively.

5. 5. The ballpoint pen according to claim 4, comprising the three core holes and the three colored cores, the colored cores being arranged at angular intervals of 120 degrees in the circumferential direction.

6. 5. The ballpoint pen according to claim 3, further comprising a moving mechanism for simultaneously moving all three colored leads forward and backward, the three colored leads being inserted into the three lead holes so as to be freely retractable.

7. A touch pen having the pen structure according to claim 1, A touch pen comprising a plurality of touch pen tips arranged at one end of the pen shaft, the touch pen having three touch pen tips oriented so as to open outward from a direction along the axial line of the pen shaft.

8. A touch pen having the pen structure according to claim 2, A touch pen comprising a plurality of touch pen tips arranged at one end of the pen shaft, the touch pen having three touch pen tips oriented so as to open outward from a direction along the axial line of the pen shaft.

9. 9. The touch pen according to claim 8, wherein the three touch pen tips are arranged at angular intervals of 120 degrees in the circumferential direction.

10. 5. The ballpoint pen according to claim 3, further comprising one or more pen tips disposed at the other end of the pen barrel.

11. 5. The ballpoint pen according to claim 3, further comprising an eraser disposed at the other end of the pen barrel.

12. The pen has three core holes and three touch pen tips inserted into the core holes, respectively; The touch pen according to claim 7 or 8, wherein the three touch pen tips are inserted into the three core holes so as to be freely movable forward and backward, and further comprising a movement mechanism that moves all three touch pen tips forward and backward simultaneously.

13. The touch pen according to claim 7 or 8, further comprising one or more pen tips disposed at the other end of the pen shaft.

14. The touch pen according to claim 7 or 8, further comprising an eraser disposed at the other end of the pen shaft.

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