JP7803553B2 - Pen structure, ballpoint pen, and touch pen - Google Patents

Description

The present invention relates to a pen structure, a ballpoint pen, and a touch pen that have multiple pen tips.

Multicolor ballpoint pens have been known for some time. These ballpoint pens use a knock mechanism or a rotary mechanism to select and extend each color. There have also been proposals for pens that combine multiple pens, leaving the pen tips exposed at all times and eliminating the need for knocking or rotary extension, but most of these have straight pen shafts arranged parallel to each other (see, for example, Patent Document 1, for a rotary extension mechanism).

Jitszen Showa 60-120886 Publication

The majority of conventional multi-color ballpoint pens use a knock mechanism to push out the required color from a multi-colored ballpoint pen refill, or a twist mechanism to advance the refill. Of these, most knock mechanism pens tend to have thick pen barrels. Furthermore, because you have to change hands and knock or twist the pen every time you want to change colors, operation is cumbersome when frequently switching colors, such as for schedule management or study purposes. Furthermore, knock mechanisms often make noise 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.

In addition, there were also pens with multiple exposed nibs that did not use 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.

Other proposals have included a system in which multiple pen barrels are pushed out simultaneously and fixed together at one point, but this means that the nibs are hidden behind the body when writing and are difficult to see, and the nibs of each color are close together at a small angle, meaning that different colors interfere with each other when writing. Even with the knock mechanism, some designs use rubber or similar to reduce switching noise, but the effort of knocking and changing grip when switching still remains.

The present invention aims to provide a pen structure that allows for easy switching of colors and functions, and is easy to write with without interference.

To achieve the above objective, the pen structure of the present invention comprises a pen barrel that is held by hand, and a plurality of pen tips that are arranged at one end of the pen barrel and are oriented so that they open outward from a direction along the axial line of the pen barrel.

The ballpoint pen of the present invention also has the above-described pen structure, and includes 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 that are inserted into the core holes, respectively.

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 touch pen tips oriented so as to open outward from a direction along the axial line of the pen barrel.

As such, the pen structure of the present invention comprises a pen barrel that is held in the hand, and multiple pen tips that are arranged at one end of the pen barrel and are oriented so that they open outward from the direction along the axial line of the pen barrel. This configuration results in a pen structure that makes it easy to switch colors and functions and allows for easy writing without interference.

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

Furthermore, the touch pen of the present invention has the above-described pen structure and includes multiple touch pen tips arranged at one end of the pen barrel, which are oriented so that they open outward from the direction along the axial line of the pen barrel. This configuration results in a touch pen that is easy to switch colors and functions and is easy to write with without interference.

1 is a plan view illustrating the overall configuration of a ballpoint pen according to a first embodiment. FIG. 1 is a side view of a ballpoint pen according to a first embodiment. FIG. 1 is a front view of a ballpoint pen according to a first embodiment. 1A is a cross-sectional view 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. 1. 3 is an enlarged cross-sectional view illustrating the configuration of the vicinity of the tip of the ballpoint pen of Example 1. FIG. FIG. 10 is a side view illustrating the overall configuration of the touch pen of Example 2. 10A and 10B are perspective views illustrating the structure of a pen according to a third embodiment, in which (a) is a perspective view and (b) is a front view. 10A to 10C are diagrams illustrating the operation of the pen structure of the third embodiment. 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. 10A to 10C are diagrams illustrating the operation of the pen structure of the fourth embodiment. 10A and 10B are explanatory diagrams illustrating the shape of the pen structure of Example 5. FIG. 10 is a front view illustrating the structure of the pen of Example 5.

Embodiments of the present invention will be described below 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 to those alone.

(composition)
First, the configuration of a multi-color 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 that is held by hand, and a plurality of pen tips 11a to 11c, each of which is a color core 22a to 22c, disposed at one end of the pen barrel 10. The pen tips 11a to 11c are oriented so as to open outward from the direction along the axial line of the pen barrel 10. As will be described later, these pen tips 11a to 11c are oriented so as to be spaced apart from each other toward their respective tips. The color cores 22a to 22c are different colors, and may be, for example, light blue, blue, red, or black.

For example, the first pen tip 11a at the tip side bends outward from the base end toward the tip side (from right to left in Figure 2) in a direction parallel to (or 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 third pen tip 11c have a similar configuration. As a result, the first to third pen tips 11a to 11c are oriented so that they are spaced apart from each other.

Furthermore, the pen structure S of this embodiment further includes one (or more) color cores 24 as nibs 12 located at the other end of the pen barrel 10. This fourth nib 12, like the first to third nibs, is also oriented so that it opens outward from the direction along the axial line of the pen barrel 10.

In other words, the fourth pen tip 12 on the base end side bends outward from the tip end side toward the base end side (from left to right in Figure 2) in a direction parallel to the axial line of the pen barrel 10 (the straight line connecting the centers of the circular cross sections).

The pen structure S of this embodiment also includes an eraser 13 located at the other end of the pen shaft 10. This eraser 13 can be a regular sand eraser, or, if using ink that fades when heated, a material that generates frictional heat can also be used.

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

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 be approximately half the length of the pen barrel 10. The outer diameter of each color lead 22a (22b, 22c, 24) is set to be approximately the same as (actually slightly smaller than) the inner diameter of the corresponding lead hole 21a. Furthermore, because the color leads 22a-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.

More specifically, as shown in Figures 4(a) and (b), three core holes 21a to 21c are formed at the tip of the pen barrel 10, and each core hole 21a (21b, 21c) is formed so that it curves from a position closer to the center of the cross section to a position further away as it moves toward the tip.

When viewed in cross section along the axial line, as shown in Figure 5, it curves outward from the direction along the central axis toward the tip. 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-11c from one another so that they open outward (a "wedge-shaped support mechanism").

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 that it curves from a position closer to the center of the cross section to a position further away as it moves toward the base end. When viewed in a cross section cut along the axial line, it curves outward from the direction along the central axis (not shown) toward the base end.

As a result, the color lead 22a inserted into the core hole 21a is bent to fit the shape of the core hole 21a, and is pressed against the inner surface of the core hole 21a by the elastic force of the color lead 22a itself. As a result, the friction between the color lead 22a and the core hole 21a prevents it from slipping out of the core hole 21a even without a special fastener. Of course, you can pull the color lead 22a out of the core hole 21a with a strong force.

As shown in the front view of Figure 3, these multiple pen tips, each consisting of multiple colored leads 22a-22c, have three lead holes 21a-21c and three colored leads 22a-22c, which are arranged circumferentially at intervals of 120 degrees. In other words, the three colored leads 22a-22c are arranged so that their tips are rotationally symmetrical (120 degrees apart) relative to the axial line.

Therefore, when actually using the ballpoint pen 2, the color cores 22a-22c can be changed to a different color by the extremely simple operation of holding the pen barrel 10 with your fingers and rotating it 120 degrees forward or backward. For example, you can change the color from light blue color core 22a to red color core 22c by rotating it forward (clockwise when viewed from the front), and you can change the color from light blue color core 22a to blue color core 22b by rotating it in the opposite direction.

Furthermore, because the colored lead 22a (22b, 22c) is pressed against the lead hole 21a (21b, 21c) over a wide area, rather than just near the exit, the writing point at the tip of the colored lead 22a (22b, 22c) is stable, resulting in less wobble and making the ballpoint pen 2 extremely easy to write with. In addition, when actually writing, the writing lead 22a is placed downwards, 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 easier.

Furthermore, although not limited to this, it is also preferable for the core hole 21a (21b, 21c) to have a curved shape that curves more sharply toward the tip exit (like a clothoid curve). By making the curvature gradually increase as you approach the opening of the core hole 21a in this way, the colored core 22a (22b, 22c) is pressed against the core hole 21a (21b, 21c) over a wide area, but is pressed most strongly near the exit. As a result, the colored core 22a (22b, 22c) is even more firmly fixed near the exit. This stabilizes the writing point of the pen tip (i.e., the length of the free end is shortened), resulting in less wobble and making the ballpoint pen extremely easy to write with.

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

(1) As described above, the pen structure S of this embodiment comprises a pen body 10 that is held in the hand, and multiple pen tips 11a-11c that are arranged at one end of the pen body 10 and are oriented so that they open outward from the direction along the axial line of the pen body 10. This configuration results in a pen structure that makes it easy to switch colors and functions and writes easily without interference. In other words, the pen structure S of this embodiment allows different colors to be exposed and allows writing with each color without interference.

(2) Furthermore, by further providing one or more pen tips 12 at the other end of the pen body 10, a greater number of pen tips 12 can be used to provide a greater variety of colors and functions. 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.

(3) Furthermore, by further providing an eraser 13 placed at the other end of the pen holder 10, if a mistake is made, the mistake can be quickly erased by turning the pen holder 10 over.

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

This configuration allows for easy switching between the colored leads 22a-22c, and results in a ballpoint pen 2 that is easy to write with without interference. In other words, with the ballpoint pen 2 of this embodiment, different colors can be written with one at a time without interference, while still leaving the different colors exposed. Furthermore, this simple configuration with the lead hole 21a and colored lead 22a simplifies the structure, which also has the effect of allowing the pen barrel 10 to be made thinner. Therefore, the multi-colored ballpoint pen 2 of the present invention is extremely easy to hold and write with.

Furthermore, the ballpoint pen 2 is designed for use on a desk or carried in a notebook or diary. Even if the pen tip is always exposed and fixed, the angle of each color tip 22a-22c of the beveled ballpoint pen 2 according to the present invention is slight from the center of the pen barrel, so the paper will not be soiled when carried around. Furthermore, the slightly widened pen tip provides a snag when carried in a notebook or diary, making it less likely to slip off, and the multi-color ballpoint pen is less likely to roll when placed on a desk.

Furthermore, unlike conventional multi-color ballpoint pens with a knock mechanism for each color, the ballpoint pen 2 of the present invention is a multi-color ballpoint pen that does not produce any knocking noise or component interference noise or vibration when changing colors. Even if a retraction mechanism is installed in the future to expose all colors with a single knock and retract them back into the main body, no knocking noise will be generated when changing colors (although a knocking noise will be generated when moving the pen forward and backward).

(5) Furthermore, the pen has three core holes 21a-21c and three colored cores 22a-22c, which are spaced apart by 120 degrees in the circumferential direction. This means that 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 nibs are less likely to overlap when writing, making it easier to write. Conversely, with four or more cores, the nibs overlap, making it difficult to write.

(6) Furthermore, it is preferable that the multiple color cores 22a-22c are inserted into the multiple core holes 21a-21c so that they can be freely advanced and retreated, and that a movement mechanism be provided to simultaneously move all of the multiple color cores 22a-22c forward and retreated. Specifically, such a movement mechanism can be a so-called "knock cam mechanism" consisting of a "cam body (external cam)," a "knock rod," and a "rotor."

The touch pen 3 having the pen structure S of the present invention will be described below using Figure 6. Note that parts that are the same as or equivalent to those described in Example 1 will be denoted by the same reference numerals.

(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 shaft 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 shaft 10 and are oriented so as to open outward from a direction along the axial line of the pen shaft 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.

Specifically, as shown in Figure 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, which are oriented so as to open outward from the direction along the axial line of the pen barrel 10, and a plurality of touch pen tips 32a-32c as pen tips (11a-11c) that are inserted into the core holes 31a-31c, respectively. Of these, the outer diameter of the shaft of the touch pen tip 32a is set to be approximately the same as (actually slightly smaller than) the inner diameter of the corresponding core hole 31a.

(effect)

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

(2) Furthermore, the pen is equipped with three touch pen tips 32a-32c, which are spaced apart by 120 degrees in the circumferential direction. Therefore, simply by rotating the pen shaft 10 forward or backward by 120 degrees, it is possible to easily switch to a different color, line type, or function.

Note that other configurations and effects are substantially the same as those in Example 1, so explanations will be omitted.

Below, we will explain the pen structure S, which has a different form from Examples 1 and 2, using Figures 7 and 8. Note that parts that are the same or equivalent to those described in Examples 1 and 2 will be explained using the same reference numerals.

(composition)
First, we will explain the configuration of a ballpoint pen (2) that has the pen structure S of this embodiment. Although not shown, the ballpoint pen (2) is similar to embodiments 1 and 2 in that it has 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 the direction along the axial line of the pen barrel 10, and three colored cores (22a to 22c) that serve as three pen tips (11a to 11c) that are inserted into the three core holes 21a to 21c, respectively.

In the pen structure S of this embodiment, as shown in Figures 7(a) and (b), the cross section of the pen barrel 10 is circular, and the circumferential portions adjacent to each of the multiple pen tips (color cores; 22a-22c) are chamfered to form multiple flat surfaces 25a-25c. In other words, 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 center 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.

More specifically, as shown in Figure 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.

(Actions and Effects)
Next, the operation of a ballpoint pen (2) equipped with the pen structure S of this embodiment will be described using Figures 8(a) to 8(c). As shown in Figure 8(a), when writing with the color lead 22a (e.g., red), the pen structure S has one flat surface 25a facing directly downward (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.

Next, as shown in Figure 8(b), when writing with the colored lead 22b (e.g., blue), from the state shown in Figure 8(a), rotate the pen clockwise while placing your 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 colored lead 22b, you can hold the pen body 10 stably at three points by pressing the flat surface 25b with your middle finger and the flat surfaces 25a and 25c with your index finger and thumb, respectively.

Similarly, as shown in Figure 8(c), when writing with the colored lead 22c (e.g., black), from the state shown in Figure 8(b), the pen is rotated clockwise while placing fingers on the flat surfaces 25a-25c. This causes one flat surface 25c to face directly downward (the 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 the colored lead 22c, the pen body 10 can be held stably at three points by pressing the flat surface 25c with the middle finger and the flat surfaces 25b and 25a with the index finger and thumb, respectively.

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

As described above, in the pen structure S of this embodiment, the cross section of the pen body 10 is circular, and the circumferential portion adjacent to each of the multiple pen tips (11a-11c) is chamfered to form one or more flat surfaces 25a-25c. This configuration makes it easy to rotate the pen body 10 while holding it with your fingers, and allows for stable positioning.

Note that other configurations and effects are substantially the same as those in Example 1, so explanations will be omitted.

Next, we will explain the pen structure S, which has a different configuration from Examples 1 to 3, using Figures 9 and 10. Note that parts that are the same or equivalent to those described in Examples 1 to 3 will be described using the same reference numerals.

(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 general 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.

Furthermore, the multiple pen tips 11a-11c are positioned at at least one of the following locations: 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 positioned 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, for example, as 240 degrees (P3; third quadrant; 22b) and 300 degrees (P3'; fourth quadrant; 22c) from the center of the ellipse.

(Actions and Effects)
Thus, the pen structure S of this embodiment is a pen structure S with a slightly elliptical cross section, with the three pen tips 22a-22c adjusted to be in predetermined positions. This ellipse touches 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 provides a state in which the fixation of the inscribed ellipse is high at the positions where the bisectors of each angle of the triangle and the major axis L1 of the ellipse overlap. That is, the 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)).

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

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 that provides a higher degree of fixation.

Furthermore, the multiple pen tips 22a-22c are positioned at at least one of the following locations: one vertex P1 on the major axis L1 side of the ellipse; and two midpoints 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-22c in a highly fixed position, it is possible to instantly stop rotation at a stable angle where the selected pen tip 22a-22c faces the paper surface.

Note that other configurations and effects are substantially the same as those in Example 1, so explanations will be omitted.

Next, we will explain the pen structure S, which has a different configuration from Examples 1 to 4, using Figures 11 and 12. Note that parts that are the same or equivalent to those described in Examples 1 to 4 will be explained using the same reference numerals.

(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 outer shape 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 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.

In other words, 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 Figure 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 vertical, and an ellipse 103 whose major axis L1 is tilted +60 degrees from vertical. The resulting shape is relatively flat, with its centers 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 positioned at these three positions.

As such, in the pen structure S of this embodiment, the cross-sectional shape of the pen body 10 resembles a triangular rice ball, with three slightly flattened ellipses rotated 120 degrees each and stacked on top of each other. The three pen tips 22a-22c are positioned in a balanced manner, with the three nibs positioned close to where the outlines of the ellipses overlap on the major axis L1 of each ellipse 101-103.

(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.

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 standard-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 simple 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.

As described above, in the pen structure S of this embodiment, the cross section of the pen shaft 10 is formed to have an outer shape formed by rotating three identical ellipses 101-103 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 101-103 intersect, making it easy to rotate the pen shaft 10 and keep it in the appropriate position.

Note that other configurations and effects are substantially the same as those in Example 1, so explanations will be omitted.

(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.

The three types of cross-sectional shapes (grip shapes) of the pen body 10 in Examples 3 to 5 can be used depending on the pen model lineup, allowing for shapes that suit each design and function. For example, if a pen body is also placed at the rear end of the pen body, using the oval shape of Example 4 makes it possible to comfortably fit a large number of pen nibs inside the pen body. Example 3 is suitable for pens with a thinner body, such as those used in 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.

By adhering to these principles for the cross-sectional shape (grip shape) of the pen body 10, pens with multiple nibs can be made easy to handle. In particular, compared to the typical circular shape of the pen body 10, the sides are carved or recessed, which makes it possible to achieve an easy-to-use shape while also reducing the amount of material used.

The above describes in detail an embodiment of the present invention with reference to the drawings, but 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.

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 a touch pen tip, or two at one end may be colored tips and one may be a touch pen.

In addition, in Example 1, the color cores 21a-21c, 24 were described as being formed to a length approximately half the length of the pen barrel 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 barrel 10 as long as they do not interfere with the structure at the other end.

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

Furthermore, while the examples have been described with a standard pen grip, the present invention is not limited to this. For example, it is possible to hold the pen with the thumb extended straight. In such a case, the triangle formed by the three fingers will become an inverted triangle relative to the paper surface. To address this, the chamfering position described above can be rotated by 60 degrees, so that the chamfered areas in the original model become convex, and the non-chamfered areas become concave (chamfered).

S Pen structure P1 First vertex P2 Second vertex P3 Midpoint L1 Long axis L2 Short axis 10 Pen shaft 101-103 Ellipses 11a, 11b, 11c Pen tip (tip side)
12 Pen tip (base end side)
13 Eraser 2 Ballpoint pen 21a, 21b, 21c Core hole 22a, 22b, 22c Color core 23 Core hole (base end side)
24 Color core (base end side)
25a-25c Flat surface 3 Touch pen 31a, 31b, 31c Core hole 32a, 32b, 32c Touch pen core 33 Core hole (base end side)
34 Touch pen core (base end side)
35 Eraser

Claims (14)

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. 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. 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. 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. A ballpoint pen as described in claim 4, comprising the three core holes and the three colored cores, the colored cores being arranged at 120-degree intervals in the circumferential direction. A ballpoint pen as described in claim 3 or 4, wherein the three colored leads are inserted into the three lead holes so as to be freely retractable, and further comprising a movement mechanism that moves all three colored leads back and forth simultaneously. 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. 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. A touch pen as described in claim 8, wherein the three touch pen tips are arranged at 120-degree intervals in the circumferential direction. A ballpoint pen as described in claim 3 or 4, further comprising one or more nibs disposed at the other end of the pen barrel. A ballpoint pen as described in claim 3 or 4, further comprising an eraser disposed at the other end of the pen barrel. 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. The touch pen described in claim 7 or 8, further comprising one or more pen tips disposed at the other end of the pen barrel. The touch pen described in claim 7 or 8, further comprising an eraser disposed at the other end of the pen shaft.