阅读说明：本技术 书写用具 (Writing implement ) 是由 吉川将史 于 2021-06-02 设计创作，主要内容包括：提供一种使用者的满意度高的书写用具。书写用具(P)具备以第1线宽(d1)进行书写的第1书写功能和以宽度比第1线宽(d1)窄的第2线宽(d2)进行书写的第2书写功能。第1书写功能用的第1墨(31)和第2书写功能用的第2墨(32)是同系色,第2墨(32)的彩度比第1墨(31)的彩度高。或者,第1书写功能用的第1墨(31)和第2书写功能用的第2墨(32)是同系色,第2墨(32)的明度比第1墨(31)的明度低。(Provided is a writing implement with high user satisfaction. The writing instrument (P) has a 1 st writing function for writing with a 1 st line width (d1) and a 2 nd writing function for writing with a 2 nd line width (d2) narrower than the 1 st line width (d 1). The 1 st ink (31) for the 1 st writing function and the 2 nd ink (32) for the 2 nd writing function are of the same color, and the chroma of the 2 nd ink (32) is higher than that of the 1 st ink (31). Alternatively, the 1 st ink (31) for the 1 st writing function and the 2 nd ink (32) for the 2 nd writing function are homologous colors, and the lightness of the 2 nd ink (32) is lower than that of the 1 st ink (31).)

1. A writing instrument having a 1 st writing function for writing with a 1 st line width and a 2 nd writing function for writing with a 2 nd line width narrower than the 1 st line width,

the writing utensil is characterized in that,

the 1 st ink for the 1 st writing function and the 2 nd ink for the 2 nd writing function are the same color,

the chroma of the 2 nd ink is higher than the chroma of the 1 st ink.

2. A writing implement according to claim 1,

the lightness of the 2 nd ink is higher than that of the 1 st ink.

3. A writing instrument having a 1 st writing function for writing with a 1 st line width and a 2 nd writing function for writing with a 2 nd line width narrower than the 1 st line width,

the writing utensil is characterized in that,

the 1 st ink for the 1 st writing function and the 2 nd ink for the 2 nd writing function are the same color,

the lightness of the 2 nd ink is lower than the lightness of the 1 st ink.

4. A writing implement according to claim 3,

the chroma of the 2 nd ink is higher than the chroma of the 1 st ink.

5. A writing implement according to claim 3,

the chroma of the 2 nd ink is lower than that of the 1 st ink.

6. A writing implement according to any one of claims 1 to 5,

the 1 st ink contains a resin pigment.

7. A writing implement according to any one of claims 1 to 5,

the 2 nd ink contains a dye.

8. A writing utensil as claimed in claim 6,

the 2 nd ink contains a dye.

9. A writing implement according to any one of claims 1 to 5,

the pen tip for the 1 st writing function is provided at one end of the barrel, and the pen tip for the 2 nd writing function is provided at the other end of the barrel.

10. A writing implement according to any one of claims 1 to 5,

the ink supply device is provided with a 1 st ink holding portion for holding the 1 st ink and a 2 nd ink holding portion for holding the 2 nd ink without contacting the 1 st ink.

11. A writing utensil as claimed in claim 10,

the 1 st ink holding amount of the 1 st ink holding portion is larger than the 2 nd ink holding amount of the 2 nd ink holding portion.

Technical Field

The present invention relates to writing instruments.

Background

There is a so-called multi-function writing instrument having a plurality of writing functions in one writing instrument. The multifunctional writing instrument has an advantage of reducing the number of the writing instruments, and is widely used mainly for people who carry many writing instruments.

As one of the multifunctional writing tools, there is a writing tool in which pen tips are provided at both ends of a shaft tube, and the writing tool is called a double-headed writing tool or the like (patent documents 1 to 3). For example, in the writing instrument of patent document 3, a thick writing pen core having a rectangular cross section is provided on one end side of a shaft tube, and a thin writing pen core having a circular cross section is provided on the other end side. In this writing instrument, these 2 types of writing cores are attached to both ends of a common ink storage body, and ink is supplied from there to each writing core, thereby enabling writing with each writing core.

When this writing instrument is used, the writing can be performed by using a thick writing pen having a rectangular cross section and performing writing so that ink is superimposed on characters on a paper surface. Further, characters can be written on a paper surface by using a refill for fine writing having a circular cross section. That is, a writing implement may be used as a marker pen or a sign pen.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 61-215095

Patent document 2: japanese patent laid-open publication No. 2017-13316

Patent document 3: japanese laid-open patent publication No. 2003-136889

Disclosure of Invention

Problems to be solved by the invention

Considering the ease of use in the case of, for example, marking (that is, the case of using the writing instrument as a marker pen) by using the refill for rough writing in the writing instrument of patent document 3, it is preferable to use an ink having a color tone such as light blue which is difficult to reduce (inhibit) the visibility of the marked characters. However, in the case of such a color ink, when characters or the like are written using the fine writing pen core of the writing instrument (that is, when the writing instrument is used as a sign pen), the visibility of the written characters is deteriorated. Poor visibility means a state in which written characters and the like cannot be clearly read. Although visibility can be improved by thickening the pen core, in this case, fine characters cannot be written any more, and the sign pen cannot function as a fine character sign pen.

Conversely, if the writing instrument of patent document 3 is used as a sign pen, the writing instrument is preferably used as a sign pen in a color tone of red or the like, which allows characters to be clearly read. However, in the case of ink having such a color tone, the visibility of the characters to be marked is reduced when the writing instrument is used as a marker. That is, the characters with the ink superimposed thereon can no longer be clearly read.

As described above, in the writing instrument disclosed in patent document 3, it is difficult to achieve both of good usability (i.e., good usability as a marker) when a thick writing pen is used for marking and good usability (i.e., good usability as a sign pen) when characters are written using a thin writing pen. Therefore, users who require both convenience of use often have a light blue writing implement for use as a marker pen and a red writing implement for use as a sign pen, and lose the meaning as a multifunctional writing implement. On the other hand, if such 2-piece writing tools are used in combination, there is a problem that "in a note or the like, a portion marked with light blue and characters written in red are mixed, and the sense of unity of color disappears, and the overall appearance is deteriorated".

The present invention has been made in view of the above circumstances, and an object thereof is to provide a writing instrument with high user satisfaction.

Means for solving the problems

The present invention adopts the following means to achieve the object.

That is, the invention according to claim 1 is a writing instrument having a 1 st writing function of writing with a 1 st line width and a 2 nd writing function of writing with a 2 nd line width narrower than the 1 st line width,

the writing utensil is characterized in that,

the 1 st ink for the 1 st writing function and the 2 nd ink for the 2 nd writing function are the same color,

the chroma of the 2 nd ink is higher than the chroma of the 1 st ink.

Further, the invention according to claim 2 is a writing instrument comprising a 1 st writing function for writing with a 1 st line width and a 2 nd writing function for writing with a 2 nd line width narrower than the 1 st line width,

the writing utensil is characterized in that,

the 1 st ink for the 1 st writing function and the 2 nd ink for the 2 nd writing function are the same color,

the lightness of the 2 nd ink is lower than the lightness of the 1 st ink.

The color can be defined from 3 attributes of "hue", "chroma", and "lightness", and in each of the above-described configurations, "homologous color" refers to a color having the same or similar hue. Here, "hue approximation" means that the angle formed by 2 hues in the hue ring is 90 degrees or less (particularly preferably 45 degrees or less).

As described above, conventionally, when inks of the same color are supplied to a refill for thick writing used as a marker pen or the like and a refill for thin writing used as a sign pen or the like, it is considered that it is impossible to avoid either "the deterioration of visibility of characters or the like when the characters or the like are superimposed on the characters or the like using the refill for thick writing" or "the deterioration of visibility of characters or the like when the characters or the like are written on a paper surface or the like using the refill for thin writing".

However, the inventors have found that even a color (for example, red) which is considered to have high visibility inhibition performance of characters and the like when ink is superimposed on the characters and the like (typically, black characters written on a white paper surface) can be reduced in visibility by lowering the chroma (see fig. 3 (a)). The inventors have also found that even if a color (for example, light blue) is considered to be low in visibility of characters or the like written on a paper surface or the like (typically, a white paper surface), the visibility can be improved by increasing the chroma (see fig. 3 (b)). That is, it was found that, regardless of the hue of the color, the visibility of the character or the like when the ink is superimposed on the character or the like can be suppressed to be low by adjusting the chroma, and that, regardless of the hue of the color, the visibility of the character or the like when the character or the like is written can be improved by adjusting the chroma.

The configuration according to claim 1 is completed based on the new findings, and by setting the 1 st ink for the 1 st writing function that writes with the 1 st line width that is relatively wide and the 2 nd ink for the 2 nd writing function that writes with the 2 nd line width that is relatively narrow to the same color, and setting the chroma of the 2 nd ink to be higher than the chroma of the 1 st ink, it is possible to make both the visibility of characters and the like on which the 1 st ink is superimposed and the visibility of characters and the like written with the 2 nd ink good, and to make a sense of unity even if a portion written with the 1 st ink and a portion written with the 2 nd ink are present in a mixture in a note or the like. Thus, a writing instrument with high user satisfaction can be obtained.

The inventors have also found that even in a color having high visibility inhibition properties of characters or the like when ink is supposed to be superimposed on the characters or the like, the visibility inhibition properties can be reduced by increasing the brightness (see fig. 4 (a)). The inventors have also found that even a color considered to have low visibility of characters or the like written thereon can improve the visibility by lowering the lightness (see fig. 4 (b)). That is, it was found that, regardless of the hue of the color, the visibility of a character or the like when the character or the like is superimposed with ink can be suppressed to be low by adjusting the lightness, and that, regardless of the hue of the color, the visibility of the character or the like when the character or the like is written can be improved by adjusting the lightness.

The configuration according to claim 2 is completed based on the new findings, and by setting the 1 st ink for the 1 st writing function that writes with the 1 st line width that is relatively wide and the 2 nd ink for the 2 nd writing function that writes with the 2 nd line width that is relatively narrow to be the same color, and setting the lightness of the 2 nd ink to be lower than that of the 1 st ink, it is possible to make both the visibility of characters and the like on which the 1 st ink is superimposed and the visibility of characters and the like written with the 2 nd ink good, and it is possible to make a sense of unity even if a portion written with the 1 st ink and a portion written with the 2 nd ink are present in a mixture in a note or the like. Thus, a writing instrument with high user satisfaction can be obtained.

In the writing instrument according to claim 1, it is also preferable that the lightness of the 2 nd ink is higher than the lightness of the 1 st ink.

With this configuration, when characters and the like are written in the 2 nd ink, visually recognizable and bright characters and the like can be written.

In the writing instrument according to claim 2, it is also preferable that the chroma of the 2 nd ink is higher than the chroma of the 1 st ink.

According to this configuration, when characters and the like are written in the 2 nd ink, characters and the like having high visibility and being clear and conspicuous can be written.

Alternatively, in the writing instrument according to claim 2, it is also preferable that the chroma of the 2 nd ink is lower than the chroma of the 1 st ink.

According to this configuration, when characters and the like are written in the 2 nd ink, characters and the like having a low tone which are not noticeable although having visibility can be written.

Preferably, in each of the writing instruments described above,

the 1 st ink contains a resin pigment.

With this configuration, colors with low chroma and colors with high lightness can be easily expressed.

Preferably, in each of the writing instruments described above,

the 2 nd ink contains a dye.

With this configuration, an arbitrary color can be easily expressed.

Preferably, in each of the writing instruments described above,

the pen tip for the 1 st writing function is provided at one end of the barrel, and the pen tip for the 2 nd writing function is provided at the other end of the barrel.

According to this configuration, the 1 st writing function and the 2 nd writing function can be incorporated into the 1 st writing instrument with a simple configuration.

Preferably, in each of the writing instruments described above,

the ink supply device is provided with a 1 st ink holding portion for holding the 1 st ink and a 2 nd ink holding portion for holding the 2 nd ink without contacting the 1 st ink.

According to this configuration, the 1 st ink and the 2 nd ink can be prevented from being mixed.

Preferably, in each of the writing instruments described above,

the 1 st ink holding amount of the 1 st ink holding portion is larger than the 2 nd ink holding amount of the 2 nd ink holding portion.

It is considered that, in the normal usage mode, the 1 st ink for writing with the 1 st line width having a relatively wide width tends to consume more than the 2 nd ink for writing with the 2 nd line width having a relatively narrow width, and according to this configuration, the time when both inks are used up can be made close to each other, and the user satisfaction can be improved.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a writing implement with high user satisfaction can be obtained.

Drawings

Fig. 1 is a diagram showing the entire configuration of a writing instrument according to an embodiment of the present invention.

Fig. 2 is a diagram for explaining approximation of hue.

Fig. 3 is a diagram for explaining a relationship between visibility of characters and the like and saturation of ink when ink is superimposed on the characters and the like, and a relationship between visibility of the characters and the like and saturation of ink when the characters and the like are written.

Fig. 4 is a diagram for explaining a relationship between visibility of characters and the like when ink is superimposed on the characters and the like and brightness of ink, and a relationship between visibility of the characters and the like when the characters and the like are written and the brightness of ink.

Fig. 5 is a diagram for explaining the relationship between the lightness and chroma of the 1 st ink and the lightness and chroma of the 2 nd ink.

Fig. 6 is a diagram for explaining a use mode of the writing instrument.

Fig. 7 is a diagram for explaining the relationship between the lightness and chroma of the 1 st ink and the lightness and chroma of the 2 nd ink in the modification.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1. construction of writing implement >

The structure of the writing instrument according to the embodiment will be described with reference to fig. 1. Fig. 1 is a diagram showing the entire configuration of a writing instrument P according to the embodiment. In fig. 1, a part of the shaft tube 10 is shown in cross section for convenience of explanation.

The writing instrument P is a so-called multi-function writing instrument, and has a 1 st writing function of writing with a 1 st line width d1 having a relatively wide width and a 2 nd writing function of writing with a 2 nd line width d2 having a relatively narrow width (see fig. 6). The 1 st writing function realizes a use mode (a use mode as a so-called marker pen) in which ink is superimposed on characters or the like to perform marking. On the other hand, the 2 nd writing function realizes a use mode (a use mode as a so-called sign pen) of writing characters and the like. That is, the writing instrument P according to the present embodiment is a multifunctional writing instrument having a function as a marker pen and a function as a sign pen.

The specific value of the 1 st line width d1 is preferably about 2mm to 10mm (particularly preferably about 3mm to 6 mm), and the specific value of the 2 nd line width d2 is preferably about 0.1mm to 1.5mm (particularly preferably about 0.2mm to 0.6 mm).

As shown in fig. 1, the writing instrument P has a so-called double-ended writing instrument in which pen tips 11 and 12 are provided at both ends of a barrel 10. Although not shown, a cap is detachably provided for each of the 2 pen tips 11 and 12 so as to cover the pen tips 11 and 12 when not in use.

The pen tip (1 st pen tip) 11 provided at one end of the barrel 10 is a pen tip for the 1 st writing function, and is formed in a shape suitable for writing with a 1 st line width d1 having a relatively wide width. Specifically, for example, the first pen tip 11 is formed in a shape in which the tip end portion of the cylinder is cut along a surface inclined in the opposite direction to the central axis and the tip edge 11a is inclined with respect to a surface orthogonal to the central axis (so-called chisel shape). The width d11a of the distal edge 11a is, for example, about 3mm to 6 mm. Using the first pen tip 11 described above, a wide line can be written with a width approximately equal to the width d11a of the distal edge 11 a. That is, by appropriately adjusting the width d11a, a pen tip capable of writing a line having a 1 st line width d1 with a relatively wide width can be obtained (fig. 6 (a)).

The pen tip (2 nd pen tip) 12 provided at the other end of the barrel 10 is a pen tip for the 2 nd writing function, is formed in a shape suitable for writing with the 2 nd line width d2 having a relatively narrow width, and is different from the shape of the 1 st pen tip 11. Specifically, for example, the 2 nd pen tip 12 includes a substantially conical portion (reduced diameter portion) 12a formed to be reduced in diameter toward the tip end, and a cylindrical portion (cylindrical portion) 12b extending from an end portion on the reduced diameter side. When the 2 nd pen tip 12 is used, a narrow line having a width not more than the diameter d12b of the tip of the cylindrical portion 12b can be written. For example, by setting the diameter d12b of the tip of the cylindrical portion 12b to about 0.4mm to 1.5mm, a line with a line width of about 0.2mm to 0.6mm can be written. That is, by appropriately adjusting the diameter d12b, a pen tip capable of writing a line having a 2 nd line width d2 with a relatively narrow width can be obtained (fig. 6(b), etc.). The cylindrical portion 12b has a substantially constant cross-sectional diameter over the entire axial direction, and the diameter of the tip (or the width of the line to be written) is less likely to change even if the tip is worn.

Specifically, the 1 st pen tip 11 and the 2 nd pen tip 12 may be formed of, for example, a resin-processed fiber body, a fiber-processed body having a capillary gap formed therein, a fusion-processed body of a hot-melt fiber, a porous member having pores communicating with a felt body, a plastic core having an ink reservoir formed in an axial direction of a plastic material, or a sintered core (porous body) obtained by sintering various plastic powders or the like. Of course, the materials for forming the 1 st pen tip 11 and the 2 nd pen tip 12 may be the same as each other or different from each other.

The shaft tube 10 is a cylindrical member, and 2 ink holding portions 21 and 22 are housed therein. The 1 st pen tip 11 is connected to one of the ink holding portions (1 st ink holding portion) 21, and the 1 st writing function ink (1 st ink) 31 is held in the 1 st ink holding portion 21. The 2 nd pen tip 12 is connected to the other ink holding portion (the 2 nd ink holding portion) 22, and the 2 nd ink holding portion 22 holds the ink (the 2 nd ink) 32 for the 2 nd writing function.

Here, a structure in which the respective inks 31, 32 are impregnated and held in a cotton material (so-called cotton type) is adopted. That is, the ink holding portions 21 and 22 are each constituted by a reservoir in which the ink 31 and 32 is immersed, and the ink 31 and 32 immersed in the ink holding portions 21 and 22 is transferred to the pen tips 11 and 12 by capillary action, so that writing can be performed by the pen tips 11 and 12.

The 1 st ink holding portion 21 and the 2 nd ink holding portion 22 are separately provided in such a manner that the respective inks 31, 32 held therein do not contact each other. Thus, the 1 st ink 32 and the 2 nd ink 32 are not mixed. As shown in the figure, a spacer 20 may be provided between the 1 st ink holding portion 21 and the 2 nd ink holding portion 22. That is, the inside of the shaft tube 10 may be divided into 2 spaces by the partition 20, and the ink holding portions 21 and 22 may be accommodated in the divided spaces.

The volume of the 1 st ink holding portion 21 is set to be larger than the volume of the 2 nd ink holding portion 22, and the amount of the 1 st ink 31 held by the 1 st ink holding portion 21 is set to be larger than the amount of the 2 nd ink 32 held by the 2 nd ink holding portion 22. Since the 1 st ink 31 is used for writing with the 1 st line width d1 having a relatively wide width, consumption tends to increase compared with the 2 nd ink 32 used for writing with the 2 nd line width d2 having a relatively narrow width, and by setting the holding amount of the 1 st ink 31 to be larger than the holding amount of the 2 nd ink 32, the time at which the two inks 31, 32 are used up can be made to approach each other.

The 1 st ink 31 and the 2 nd ink 32 are both obtained by dissolving a colorant in an aqueous solvent (for example, water). By adjusting the combination of the colors of the colorants, the density of the colorants of the combined colors, the mixing ratio of the colorants of the combined colors, and the like, an arbitrary color can be expressed. That is, a combination of an arbitrary hue, an arbitrary lightness, and an arbitrary chroma can be expressed.

In the 1 st ink 31, a resin pigment is used as a colorant. That is, the 1 st ink 31 is set as an ink containing a resin pigment. The resin pigment is excellent in expression of light color with low chroma and high lightness, and is suitable for expression of color C1 (described later) of the 1 st ink 31.

On the other hand, in the 2 nd ink 32, a dye is used as a colorant. That is, the 2 nd ink 32 is set as an ink containing a dye. The dye can express dark colors with higher chroma and lower lightness and wider color range, and has good color development. Therefore, it is suitable for expressing the color C2 (described later) of the 2 nd ink 32.

In the writing instrument P having the above configuration, the 1 st writing function of writing with the 1 st line width d1 relatively wide can be realized by the 1 st pen tip 11, the 1 st ink holding portion 21 connected thereto, the 1 st ink 31 held therein, and the barrel 10. That is, in the writing instrument P, the 1 st ink 31 is supplied to the 1 st pen tip 11, and the user can write by bringing the entire width direction of the distal edge 11a of the 1 st pen tip 11 into contact with the paper surface or the like, thereby drawing a line of the thick line width d1 corresponding to the width d11a of the distal edge 11a, and for example, by drawing a line on characters on the paper surface, the 1 st ink 31 can be superimposed on the characters to perform marking (fig. 6 (a)).

In the writing instrument P, the 2 nd writing function of writing with the 2 nd line width d2 which is relatively narrow can be realized by the 2 nd pen tip 12, the 2 nd ink holding portion 22 connected thereto, the 2 nd ink 32 held therein, and the barrel 10. That is, in the writing instrument P, the 2 nd ink 32 is supplied to the 2 nd pen tip 12, and the user can draw a line having a thin line width d2 corresponding to the diameter d12a of the tip by bringing the tip of the cylindrical portion 12b of the 2 nd pen tip 12 into contact with the paper surface or the like and write, for example, fine characters or the like on the paper surface with the 2 nd ink 32 (fig. 6(b) or the like).

<2. color of ink >

The color (1 st ink color) C1 of the 1 st ink 31 and the color (2 nd ink color) C2 of the 2 nd ink 32 will be described with reference to fig. 2 to 5.

<2-1. color phase >

The 1 st ink color C1 and the 2 nd ink color C2 are the same color. The color can be defined by 3 attributes, i.e., hue, chroma, and lightness, and the "homologous color" as used herein refers to a color having the same or similar hue.

The term "hue approximation" as used herein means that the angle formed by 2 hues in the hue ring is 90 degrees or less (particularly preferably 45 degrees or less). That is, as shown in fig. 2, the hue of the hue ring HC is arranged in a circular ring shape, and the hues continuously changing to red, orange, yellow, green, blue, and violet are arranged in the circumferential direction. In this color wheel HC, when the angle θ formed by the 2 hues H1 and H2 is 90 degrees or less (particularly preferably 45 degrees or less) as viewed from the center of the color wheel HC, the two hues H1 and H2 are defined as "approximate".

<2-2. chroma and lightness >

As described above, the color is defined from the attributes of chroma and lightness in addition to the hue. That is, even if the hues are the same, if at least one of the chroma and the lightness is different, the colors are different.

The inventors paid attention to the relationship between the visibility of characters and the like and the saturation of ink when ink is superimposed on the characters and the like. As a result, as schematically shown in fig. 3(a), the higher the chroma (i.e., as the vividness increases), the higher the visual obstruction is, and the lower the chroma is, the lower the visual obstruction is. It is also known that the hue of the pigment tends to be the same as that of the pigment.

The inventors also paid attention to the relationship between the visibility of characters or the like and the chroma of ink when the characters or the like are written on a paper surface or the like. As a result, as schematically shown in fig. 3(b), the higher the chroma is, the higher the visibility is improved, and the lower the chroma is, the lower the visibility is. It is also known that the hue of the pigment tends to be the same as that of the pigment. In fig. 3 and the figures referred to later, the chroma is represented by the thickness of lines, but this is for convenience of illustration.

Further, the inventors have focused on the relationship between the visibility of characters and the like and the brightness of ink when ink is superimposed on the characters and the like. As a result, it was found that, as schematically shown in fig. 4(a), the lower the lightness (i.e., as being closer to black), the higher the visual obstruction is, and the higher the lightness (i.e., as being closer to white), the lower the visual obstruction is. It is also known that the hue of the pigment tends to be the same as that of the pigment.

The inventors also paid attention to the relationship between visibility of characters or the like and lightness of ink when the characters or the like are written on a paper surface or the like. As a result, as schematically shown in fig. 4(b), the lower the lightness, the higher the visibility is, and the higher the lightness, the lower the visibility is. It is also known that the hue of the pigment tends to be the same as that of the pigment. Note that, although lightness is expressed by the density of lines in fig. 4 and the figures referred to later, it is obvious that this is for convenience of illustration only.

Hereinafter, a description will be given of a predetermined technique of lightness and chroma of the 1 st ink color C1 and the 2 nd ink color C2 based on the new findings.

The lightness and chroma of the 1 st ink color C1 and the lightness and chroma of the 2 nd ink color C2 are set to form a predetermined relative relationship between each. In addition, in the following, for the sake of easy understanding of the description, the lightness and chroma of the 1 st ink color C1 are determined first, and the lightness and chroma of the 2 nd ink color C2 are determined so as to have a predetermined relative relationship therewith, but it is obvious that the lightness and chroma of the 2 nd ink color C2 may be determined first, and the lightness and chroma of the 1 st ink color C1 may be determined so as to have a predetermined relative relationship therewith. Further, the lightness and chroma of the 1 st ink color C1 and the lightness and chroma of the 2 nd ink color C2 may be adjusted in parallel to each other so as to converge to values that form a predetermined relative relationship.

Here, the lightness and chroma of the 1 st ink color C1 are first determined. As described above, the visibility of characters and the like when ink is superimposed on the characters and the like depends on the saturation and lightness, and here, the lightness and saturation of the 1 st ink color C1 are set to a combination that is sufficiently low to prevent the visibility of the characters and the like when the 1 st ink 31 is superimposed on the characters and the like. As described above, since the visibility obstruction is lower as the saturation is lower, a lower brightness can be selected when the saturation is set to be low. Further, since the visibility impediment is lower as the brightness is higher, a higher chroma can be selected when the brightness is set to be higher. The range of lightness and chroma that can be selected also varies depending on the selected hue.

Then, the lightness and chroma of the 2 nd ink color C2 are determined. The lightness and chroma of the 2 nd ink color C2 are set to form a predetermined relative relationship with those of the 1 st ink color C1. That is, a plane coordinate (fig. 5) in which the ordinate represents the saturation and the abscissa represents the lightness is defined, and when a previously determined combination of the lightness and saturation of the 1 st ink color C1 is placed at the origin of the plane coordinate, a combination of the lightness and saturation of the 2 nd ink color C2 is selected from the coordinate values located in the 2 nd quadrant Q2 or the 3 rd quadrant Q3.

If a combination of lightness and chroma of the 2 nd ink color C2 is set as the coordinate value located in the 2 nd quadrant Q2, and is set as the coordinate value located in the 3 rd quadrant Q3, the former tends to have a high chroma (vividness) of the 2 nd ink color C2, and the latter tends to have a low chroma of the 2 nd ink color C2. Therefore, the former is hereinafter referred to as "high-chroma type Q2", and the latter is hereinafter referred to as "low-chroma type Q3".

(high chroma type Q2)

As described above, as the lightness becomes lower, the visibility of characters and the like when the characters and the like are written becomes higher, and in the high chroma type Q2, the lightness of the 2 nd ink color C2 is set lower than the lightness of the 1 st ink color C1. Therefore, the visibility of characters and the like written with the 2 nd ink 32 can be improved.

As described above, as the chroma increases, the visibility of characters and the like written thereon improves, and in the high chroma type Q2, the chroma of the 2 nd ink color C2 is set to be higher than the chroma of the 1 st ink color C1. Therefore, the visibility of characters and the like written with the 2 nd ink 32 can be sufficiently high.

That is, by setting the lightness of the 2 nd ink color C2 lower than the lightness of the 1 st ink color C1 and the chroma of the 2 nd ink color C2 higher than the chroma of the 1 st ink color C1, it is possible to increase the visibility of characters and the like written with the 2 nd ink 32 and decrease the visibility of characters and the like when the 1 st ink 31 is superimposed on the characters and the like (that is, increase the visibility of characters and the like superimposed with the 1 st ink 31).

Further, since the vividness of color increases as the chroma becomes higher, in the high chroma type Q2, when characters and the like are written with the 2 nd ink 32, the characters and the like are written vividly. Such a function is useful, for example, in a use case where characters which are clearer and more conspicuous than characters written with a pencil or a mechanical pencil are to be written.

(Low chroma type Q3)

As described above, as the lightness becomes lower, the visibility of characters and the like when the characters and the like are written becomes higher, and in the low chroma type Q3, the lightness of the 2 nd ink color C2 is set lower than the lightness of the 1 st ink color C1. Therefore, the visibility of characters and the like written with the 2 nd ink 32 can be improved.

That is, by setting the lightness of the 2 nd ink color C2 lower than the lightness of the 1 st ink color C1, it is possible to make the visibility of characters and the like when characters and the like are written on the 2 nd ink 32 high, and to make the visibility of characters and the like when the 1 st ink 31 is superimposed on characters and the like low.

As described above, as the chroma increases, the visibility of characters and the like written thereon improves, but in the low chroma type Q3, the chroma of the 2 nd ink color C2 is set to be lower than the chroma of the 1 st ink color C1. Since the vividness of color decreases as the chroma becomes lower, when characters and the like are written with the 2 nd ink 32 in the low chroma type Q3, the characters and the like are written with colors in which the vividness is suppressed. Such a function is useful, for example, in a use case where characters written with a pencil or a mechanical pencil are to be written while being distinguishable from characters written with a low-tone character (i.e., characters that are not excessively conspicuous).

Note that, if the chroma of the 2 nd ink color C2 is set to a low chroma, the visibility of characters and the like written in the 2 nd ink 32 is reduced, but this can be compensated for by brightness adjustment. That is, in the low chroma type Q3, the visibility of characters and the like written on the 2 nd ink 32 is ensured by adjusting the lightness of the 2 nd ink color C2.

<3 > mode of use >

Next, a description will be given of a usage mode of the writing instrument P by taking a case of taking a class note as an example.

The teacher gives lessons while writing, and the students use the pencils and the propelling pencils to write the contents of the writing in the notes. In many cases, the teacher may say "the important part", "remember the important part", or the like to emphasize a specific part in the blackboard-writing. In this case, the student who takes notes can mark the portion by writing with the 1 st pen tip 11 of the writing instrument P in such a manner as to overlap ink from the pointed portion (fig. 6 (a)). As described above, the 1 st ink 31 supplied to the 1 st pen tip 11 is set to the color C1 in which the visibility of characters is difficult to be reduced even if the 1 st ink 31 is superimposed on characters or the like. Therefore, the characters (i.e., marked characters) on which the ink is superimposed can be clearly read.

In addition, the teacher may say that an opinion such as "this part appears in the examination" is given to the emphasized part, and many students want to record the opinion in a note. In this case, the student may write the teacher's opinion using the 2 nd pen tip 12 of the writing instrument P (fig. 6 (b)). As described above, the 2 nd ink 32 supplied to the 2 nd pen tip 12 is set to the color C2 with high visibility of characters and the like written on the 2 nd ink 32. Therefore, characters and the like that can be clearly read can be written.

In such a case, it is considered that, in particular, students want to write characters clearly and conspicuously than characters written with a pencil or a mechanical pencil. In this regard, the 2 nd ink 32 of the high chroma type Q2 is preferable. That is, since the 2 nd ink 32 of the high chroma type Q2 has a high chroma, it is possible to write vivid characters and to write characters more clearly and conspicuously than characters written with a pencil or a mechanical pencil.

In addition, supplementary notes (e.g., small knowledge called "… … for going to the next break", a story for expanding the contents of a lecture, etc.) often accompany the notes of a note that a teacher often wants to record these supplementary notes that are not written as boards in notes. In this case, the student may record the supplementary explanation using the 2 nd pen tip 12 of the writing instrument P (fig. 6 (c)). As described above, the 2 nd ink 32 supplied to the 2 nd pen tip 12 is set to the color C2 with high visibility of characters and the like written on the 2 nd ink 32. Therefore, characters that can be clearly read can be written.

In such a case, it is considered that, in particular, the student wants to write characters which are not conspicuously low while being distinguishable from characters written with a pencil or a mechanical pencil. In this regard, the 2 nd ink 32 of the low chroma type Q3 is preferable. That is, since the chroma is low in the case of the 2 nd ink 32 of the low chroma type Q3, characters can be written in colors in which the vividness is suppressed, and characters which are low and inconspicuous can be written. Even in the case of colors with suppressed vividness, the portion written with the 2 nd ink 32 can be easily distinguished from the portion written with a pencil or a mechanical pencil. Therefore, for example, in the above case, when the pen is viewed from behind, it is possible to clearly distinguish between a portion where the blackboard writing is taken and a portion which is not written as the blackboard writing but is added as a complement to itself.

If a note is taken in this way, although the characters written with a pencil or a mechanical pencil, the part marked with the 1 st ink 31, the characters written with the 2 nd ink 32, and the like are mixed in the note, the 1 st ink 31 and the 2 nd ink 32 are of the same color (the same color system), and therefore, the whole note has a uniform feeling, a messy impression is less likely to be generated, and the appearance is good. In addition, there can be linkage between a portion marked with the 1 st ink 31 and characters or the like written with the 2 nd ink 32.

Furthermore, if a mark is made using the 1 st ink 31 from a character written using the 2 nd ink 32, 2 colors different in at least one of homologous color, lightness, and chroma overlap. This makes it possible to create a soft impression with a uniform and harmonious feel and to produce an eye-catching expression. In other words, a new expression that cannot be produced by the conventional writing instrument can be produced. In particular, since a resin pigment is used as the colorant of the 1 st ink 31 and a dye is used as the colorant of the 2 nd ink 32, even when the 1 st ink 31 is used for marking from characters written using the 2 nd ink 32, the two inks 31 and 32 are difficult to mix. Therefore, the written characters are difficult to infiltrate.

<4. Effect >

The writing instrument P according to the above embodiment has the 1 st writing function of writing with the 1 st line width d1 and the 2 nd writing function of writing with the 2 nd line width d2 narrower than the 1 st line width d 1. Further, the 1 st ink 31 for the 1 st writing function and the 2 nd ink 32 for the 2 nd writing function are of the same color, and the chroma of the 2 nd ink 32 is higher than that of the 1 st ink 31 (high chroma type Q2). Alternatively, the 1 st ink 31 and the 2 nd ink 32 are homologous colors, and the lightness of the 2 nd ink 32 is lower than that of the 1 st ink 31 (high chroma type Q2, low chroma type Q3). In either configuration, the visibility of the characters or the like overlaid with the 1 st ink 31 and the visibility of the characters or the like written with the 2 nd ink 32 can be made good (that is, both the usability as a marker pen and the usability as a sign pen can be achieved), and even if the portion written with the 1 st ink 31 and the portion written with the 2 nd ink 32 are mixed in the note or the like, a sense of unity can be provided. Thus, a writing instrument with high user satisfaction can be obtained.

In the writing instrument P according to the above embodiment, the lightness of the 2 nd ink 32 is lower than the lightness of the 1 st ink 31, and the chroma of the 2 nd ink 32 is higher than the chroma of the 1 st ink 31 (high chroma type Q2). With this configuration, when characters and the like are written with the 2 nd ink 32, characters and the like having high visibility and being clear and conspicuous can be written.

Alternatively, in the writing instrument P according to the above embodiment, the lightness of the 2 nd ink 32 is lower than the lightness of the 1 st ink 31, and the chroma of the 2 nd ink 32 is lower than the chroma of the 1 st ink 31 (low chroma type Q3). According to this configuration, when characters and the like are written with the 2 nd ink 32, characters and the like having a low tone which are visually recognizable and inconspicuous can be written.

In the writing instrument P according to the above embodiment, the 1 st ink 31 contains a resin pigment. With this configuration, colors with low chroma and colors with high lightness can be easily expressed.

In the writing instrument P according to the above embodiment, the 2 nd ink 32 contains a dye. With this configuration, an arbitrary color can be easily expressed.

In the writing instrument P according to the above embodiment, a resin pigment is used as the colorant of the 1 st ink 31, and a dye is used as the colorant of the 2 nd ink 32. According to this configuration, even when writing is performed by the two inks 31 and 32 being overlapped, the two inks 31 and 32 are not easily mixed. Therefore, for example, even if the 1 st ink 31 is used for marking from the characters written using the 2 nd ink 32, the written characters are difficult to penetrate.

In the writing instrument P according to the above-described embodiment, the pen tip (1 st pen tip) 11 for the 1 st writing function is provided at one end of the barrel 10, and the pen tip (2 nd pen tip) 12 for the 2 nd writing function is provided at the other end of the barrel 10. According to this configuration, the 1 st writing function and the 2 nd writing function can be incorporated into the 1 st writing instrument with a simple configuration.

The writing instrument P according to the above-described embodiment includes the 1 st ink holding portion 21 that holds the 1 st ink 31 and the 2 nd ink holding portion 22 that holds the 2 nd ink 32 so as not to contact the 1 st ink 31. According to this configuration, the 1 st ink 31 and the 2 nd ink 32 can be prevented from being mixed.

In the writing instrument P according to the above-described embodiment, the amount of the 1 st ink 31 held by the 1 st ink holding portion 21 is larger than the amount of the 2 nd ink 32 held by the 2 nd ink holding portion 22. It is considered that, in the normal use mode, the consumption amount of the 1 st ink 31 for writing with the 1 st line width d1 having a relatively wide width tends to be increased compared to the 2 nd ink 32 for writing with the 2 nd line width d2 having a relatively narrow width, and according to this configuration, the time when both inks 31, 32 are used up can be made close to each other, and the user satisfaction can be improved.

<5. modified example >

In the above embodiment, when the combination of lightness and chroma of the 1 st ink color C1 is placed at the origin of the plane coordinates in which the ordinate represents chroma and the abscissa represents lightness, the combination of lightness and chroma of the 2 nd ink color C2 is selected from the coordinate values in the 2 nd quadrant Q2 or the 3 rd quadrant, but as shown in fig. 7, the combination of lightness and chroma of the 2 nd ink color C2 may be selected from the coordinate values in the 1 st quadrant Q1. That is, the chroma of the 2 nd ink 32 may be higher than the chroma of the 1 st ink 31, and the lightness of the 2 nd ink 32 may be higher than the lightness of the 1 st ink 31.

In this case, since the chroma of the 2 nd ink color C2 is higher than the chroma of the 1 st ink color C1, the visibility of characters and the like written with the 2 nd ink 32 can be improved. That is, by setting the chroma of the 2 nd ink color C2 higher than the chroma of the 1 st ink color C1, the visibility of characters and the like when the characters and the like are written on the 2 nd ink 32 can be made high, and the visibility of the characters and the like when the 1 st ink 31 is superimposed on the characters and the like can be made low.

In this case, since the lightness of the 2 nd ink color C2 is higher than the lightness of the 1 st ink color C1, when characters and the like are written in the 2 nd ink 32, bright characters and the like can be written. Note that if the lightness of the 2 nd ink color C2 is high, the visibility of characters and the like written in the 2 nd ink 32 is reduced, but this can be supplemented by adjustment of the chroma. That is, the visibility of characters and the like written on the 2 nd ink 32 is ensured by adjusting the chroma of the 2 nd ink color C2.

By setting the chroma of the 2 nd ink 32 higher than the chroma of the 1 st ink 31 and the lightness of the 2 nd ink 32 higher than the lightness of the 1 st ink 31 in this way, when characters and the like are written with the 2 nd ink 32, it is possible to write visually recognizable and bright characters and the like.

Alternatively, when the combination of the lightness and the chroma of the 1 st ink color C1 is placed at the origin of the plane coordinates in which the vertical axis represents the chroma and the horizontal axis represents the lightness, the combination of the lightness and the chroma of the 2 nd ink color C2 may be selected from the coordinate value on the axis R1 between the 1 st quadrant Q1 and the 2 nd quadrant Q2 or the coordinate value on the axis R2 between the 2 nd quadrant Q2 and the 3 rd quadrant Q3. That is, the lightness may be the same, and only the chroma may be different (the 2 nd ink color C2 is made high), or the chroma may be the same, and only the lightness may be different (the 2 nd ink color C2 is made low).

In the former case, the chroma of the 2 nd ink color C2 is higher than the chroma of the 1 st ink color C1, and in the latter case, the lightness of the 2 nd ink color C2 is lower than the lightness of the 1 st ink color C1. Therefore, in either case, the visibility of characters and the like written with the 2 nd ink 32 can be improved. In other words, in either case, the visibility of characters or the like written with the 2 nd ink 32 can be improved, and the visibility of characters or the like when the 1 st ink 31 is superimposed on the characters or the like can be reduced.

In the above-described embodiment, although the resin pigment is used as the colorant of the 1 st ink 31, this is not an essential requirement. For example, as the colorant of the 1 st ink 31, a pigment or a dye other than a resin pigment may be used. In addition, various additives such as a thickener may be added.

In the above-described embodiment, although a dye is used as the colorant of the 2 nd ink 32, this is not an essential requirement. For example, as the colorant of the 2 nd ink 32, a resin pigment or a pigment other than a resin pigment may be used. In addition, various additives such as a thickener may be added.

In the above-described embodiment, the 1 st ink 31 and the 2 nd ink 32 are obtained by dissolving the colorant in an aqueous solvent, but the solvent in which the colorant is dissolved is not necessarily aqueous, and may be, for example, oil.

In the above-described embodiment, the volume of the 1 st ink holding portion 21 is set to be larger than the volume of the 2 nd ink holding portion 22, and the holding amount of the 1 st ink 31 in the 1 st ink holding portion 21 is set to be larger than the holding amount of the 2 nd ink 32 in the 2 nd ink holding portion 22, but the volumes of the respective ink holding portions 21 and 22 (and hence the holding amounts of the respective inks 31 and 32) may be the same.

In the above-described embodiment, the writing instrument P is a so-called double-headed writing instrument in which the pen tips 11 and 12 are provided at both ends of the barrel 10, but the form of the writing instrument P is not limited to this. For example, the first pen tip 11 and the second pen tip 12 may be selectively inserted into and withdrawn from one end of the barrel 10 by a user's pushing (knock) operation or the like.

In the above-described embodiment, the writing instrument P is provided with 1 set of the 1 st pen tip 11 for realizing the 1 st writing function and the 1 st ink holding portion 21 connected thereto, and the 2 nd pen tip 12 for realizing the 2 nd writing function and the 2 nd ink holding portion 22 connected thereto, respectively, but the number of the pen tips 11, 12 and the like is not limited to this.

For example, the writing instrument may include 1 set of the 1 st pen tip 11 for realizing the 1 st writing function and the 1 st ink holding portion 21 connected thereto, and 2 sets of the 2 nd pen tip 12 for realizing the 2 nd writing function and the 2 nd ink holding portion 22 connected thereto. In such a configuration, the 1 st ink 31 may be held by the 1 st ink holding portion 21, the 2 nd ink 32 of the high chroma type Q2 having the same color as that of the 1 st ink 31 may be held by one of the 2 nd ink holding portions 22, and the 2 nd ink 32 of the low chroma type Q3 having the same color as that of the 1 st ink 31 may be held by the other 2 nd ink holding portion 22.

For example, the writing instrument may include 2 sets of the 1 st pen tip 11 for realizing the 1 st writing function and the 1 st ink holding portion 21 connected thereto, and 2 sets of the 2 nd pen tip 12 for realizing the 2 nd writing function and the 2 nd ink holding portion 22 connected thereto. In this case, the 1 st ink holding portion 21 and the 2 nd ink holding portion 22 may hold the 1 st ink 31 and the 2 nd ink 32 of the 1 st homologous color, respectively, and the 1 st ink holding portion 21 and the 2 nd ink holding portion 22 may hold the 1 st ink 31 and the 2 nd ink 32 of the 2 nd homologous color, respectively.

The shape of each of the pen tips 11 and 12 in the above-described embodiment may be changed as appropriate. For example, the first pen tip 11 may be shaped such that the tip end portion of the cylinder is cut along a counter surface inclined in the opposite direction to the center axis and the tip edge is orthogonal to the center axis. For example, the tip portion may be formed in a shape of a column having a flat cross section and cut obliquely with respect to a plane perpendicular to the central axis. For example, the cross section may be a flat column shape, and the tip portion may be orthogonal to the central axis.

In the above-described embodiment, the so-called cotton type in which the inks 31 and 32 are impregnated and held in the cotton material is adopted, but a structure in which the inks 31 and 32 are filled and held in the ink tank (so-called direct liquid type) may be adopted. That is, each ink holding portion may be constituted by an ink tank. In this case, it is preferable that each of the ink tanks is provided so that at least the internal spaces (ink storage spaces) of the ink tanks are separated and independent from each other so that the inks 31 and 32 stored in the ink tanks do not contact each other. In this case, the capacity of the ink tank filled with the 1 st ink 31 may be set to be larger than the capacity of the ink tank filled with the 2 nd ink 32. In this case, as a method of supplying the inks 31 and 32 in the respective ink tanks to the respective pen tips 11 and 12, various conventional methods such as a so-called valve type and bellows type can be adopted.

In the writing instrument P according to the above-described embodiment, specific means for realizing the 1 st writing function and the 2 nd writing function are not limited to the above-described ones.

For example, the 1 st writing function may be realized by a so-called transfer roller. Specifically, for example, the 1 st writing function may be realized by including a pen tip in which a cylindrical roller is pivotally supported so as to be rotatable around an axis, and a mechanism for supplying the 1 st ink 31 to the surface of the roller. In this case, by sliding and rolling a roller provided at the pen tip on the paper surface, a line having a line width corresponding to the width of the roller can be written with the 1 st ink 31. In such a configuration, by appropriately setting the width of the roller, a line of an arbitrary line width can be written. That is, by appropriately setting the width of the roller, a configuration in which the line width d1 having a relatively wide width can be written can be realized.

In addition, the 1 st writing function may be realized by a so-called soft pen (Japanese: ペン), for example. Specifically, for example, it is possible to include a pen tip imitating a pen and a mechanism for supplying the 1 st ink 31 thereto, thereby realizing the 1 st writing function. In such a configuration, if the user applies a pen pressure, the pen point bends to write a line having a large line width. The line width of the line to be written varies depending on the size of the pen tip, the ease of bending, and the like. Therefore, by appropriately adjusting these parameters, a configuration can be realized in which the line width d1 having a relatively wide writing width can be written.

In addition, for example, the 2 nd writing function can be realized by a so-called ball point pen. Specifically, for example, the 2 nd writing function may be realized by including a pen tip having a ball (steel ball) that is configured to be rotatable by sliding on a paper surface and a mechanism for supplying the 2 nd ink 32 thereto. In this case, by appropriately adjusting the size of the ball, a configuration in which the line width d2 having a relatively narrow width can be written can be realized.

In addition, the specific shape, specification, other detailed configuration, and the like of each part can be variously modified within a range not departing from the gist of the present invention. It is needless to say that the configurations according to the embodiment and the modifications may be appropriately combined.

Description of the reference numerals

P: a writing implement;

10: a shaft cylinder;

11: a first pen point 1;

12: a 2 nd pen point;

20: a separator;

21: the 1 st ink holding portion;

22: the 2 nd ink holding portion;

31: 1 st ink;

32: the 2 nd ink;

c1: ink color 1;

c2: ink color 2.