Writing utensils

Abstract

Provided is a writing utensil with high user satisfaction. The writing utensil (P) has a first writing function for writing with a first line width (d1) and a second writing function for writing with a second line width (d2) narrower than the first line width (d1). A first ink (31) for the first writing function and a second ink (32) for the second writing function are of the same color family, and the chroma of the second ink (32) is higher than the chroma of the first ink (31). Alternatively, the first ink (31) for the first writing function and the second ink (32) for the second writing function are of the same color family, and the lightness of the second ink (32) is lower than the lightness of the first ink (31).

Description

Technical Field

[0001] The present invention relates to writing utensils. Background Art

[0002] Among writing utensils, there are so-called multifunctional writing utensils that have multiple writing functions. Multifunctional writing utensils have the advantage of reducing the number of writing utensils one needs to carry, and are widely used, especially by people who carry a lot of writing utensils with them.

[0003] One type of multifunctional writing instrument has pen tips at both ends of a barrel, known as a double-ended writing instrument (Patent Documents 1-3). For example, the writing instrument of Patent Document 3 has a thick, rectangular-shaped refill for writing on one end of the barrel, and a thin, circular-shaped refill for writing on the other end. In this writing instrument, these two refills are attached to either end of a shared ink reservoir, from which ink is supplied to each refill, allowing writing with each refill.

[0004] This writing utensil allows you to mark text on paper by overlapping the ink with the thick, rectangular-shaped writing refill. Alternatively, you can use the thin, circular-shaped writing refill to write on paper. This means you can use the writing utensil as both a marker and a felt pen.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 61-215095

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2017-13316

[0009] Patent Document 3: Japanese Patent Application Laid-Open No. 2003-136889 Summary of the Invention

[0010] Problems to be solved by the invention

[0011] If the ease of use of the thick writing refill in the writing utensil of Patent Document 3 is considered, for example, in the case of marking (i.e., when the writing utensil is used as a marker), it is preferred to use ink of a light blue hue or the like that is difficult to reduce (hinder) the visibility of the marked text. However, if it is ink of such a hue, then when writing text, etc. using the thin writing refill in the writing utensil (i.e., when the writing utensil is used as a signature pen), the visibility of the written text will deteriorate. Poor visibility refers to a state in which the written text, etc. cannot be clearly read. Although visibility can be improved by making the refill thicker, if this is done, small text can no longer be written, and the function of a signature pen for fine characters cannot be fulfilled.

[0012] Conversely, considering the ease of use of the writing instrument disclosed in Patent Document 3 as a signature pen, it is preferable to use ink with a hue such as red, which allows for clear legibility of the written text. However, using ink with such a hue reduces the visibility of the written text when the writing instrument is used as a marker. In other words, text that is superimposed with ink cannot be clearly read.

[0013] Like this, if it is the writing utensil disclosed in patent document 3, it is actually difficult to take into account the good usability when using a thick writing refill for marking (that is, the good usability as a marker) and the good usability when using a thin writing refill for writing text, etc. (that is, the good usability as a signature pen). Therefore, users who require the usability of both parties often hold a light blue writing utensil for use as a marker and a red writing utensil for use as a signature pen, which loses its meaning as a multifunctional writing utensil. In addition, on the one hand, if such two writing utensils are used together, there will also be the problem that "in notes, etc., the part marked with light blue and the text written in red are mixed, the sense of color unity disappears, and the overall aesthetics also deteriorates."

[0014] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a writing implement having high user satisfaction.

[0015] Technical solutions to problems

[0016] In order to achieve the object, the present invention adopts the following means.

[0017] That is, a first technical solution of the present invention is a writing implement having a first writing function of writing with a first line width and a second writing function of writing with a second line width narrower than the first line width.

[0018] The writing utensil is characterized in that

[0019] The first ink for the first writing function and the second ink for the second writing function are of the same color.

[0020] The second ink has a higher chroma than the first ink.

[0021] A second aspect of the present invention is a writing implement having a first writing function for writing with a first line width and a second writing function for writing with a second line width narrower than the first line width.

[0022] The writing utensil is characterized in that

[0023] The first ink for the first writing function and the second ink for the second writing function are of the same color.

[0024] The second ink has a lower lightness than the first ink.

[0025] Color can be defined based on three attributes: hue, chroma, and lightness. In the above-mentioned structures, "analogous colors" refer to colors with the same or similar hues. Here, "similar hues" means that the angle between two hues on the color wheel is less than 90 degrees (especially preferably less than 45 degrees).

[0026] As described above, it is believed that in the past, when supplying ink of the same color to a thick writing refill used as a marker pen, etc. and a thin writing refill used as a signature pen, etc., it was unavoidable that either "the visibility of the text, etc. was reduced when ink was overlapped on the text, etc. using the thick writing refill" or "the visibility of the text, etc. was reduced when the text, etc. was written on a paper surface, etc. using the thin writing refill."

[0027] However, the inventors have discovered that even for a color (e.g., red) that is considered to have a high degree of obstruction to the visibility of text (typically, black text written on a white paper) when ink is superimposed on the text, the obstruction can be reduced by lowering the chroma (see Figure 3 (a)). In addition, the inventors have discovered that even when a text or the like is written on a paper surface (typically, a white paper surface) and the visibility of the text or the like is low (for example, light blue), the visibility can be improved by increasing the saturation (see Figure 3 (b)). In other words, it was discovered that, regardless of the hue, by adjusting the saturation, the visibility obstruction of text etc. when ink is superimposed on the text etc. can be suppressed to a low level, and that, regardless of the hue, by adjusting the saturation, the visibility of the text etc. when the text etc. is written can be improved.

[0028] The structure of the first technical solution is completed based on this new insight. The first ink used for the first writing function (writing with a relatively wide first line width) and the second ink used for the second writing function (writing with a relatively narrow second line width) are set to the same color. At the same time, the saturation of the second ink is set to be higher than the saturation of the first ink. This can improve the visibility of the text, etc. superimposed with the first ink and the text, etc. written with the second ink. Even if the parts written with the first ink and the parts written with the second ink are mixed in the notes, a sense of unity can be achieved. As a result, a writing instrument with high user satisfaction can be obtained.

[0029] Furthermore, the inventors have discovered that even for a color that is considered to have a high degree of obstruction to the visibility of a character or the like when ink is superimposed on the character or the like, the obstruction to the visibility can be reduced by increasing the brightness (see Figure 4 (a)). In addition, the inventors have found that even when a color is considered to be written text, the visibility of the text can be improved by lowering the brightness (see Figure 4 (b)). In other words, it was discovered that, regardless of the hue, by adjusting the brightness, the visibility of text or the like when ink is superimposed on the text or the like can be suppressed to a low level, and that, regardless of the hue, by adjusting the brightness, the visibility of the text or the like when the text or the like is written can be improved.

[0030] The second technical solution is based on this new insight. The first ink used for the first writing function (writing with a relatively wide first line width) and the second ink used for the second writing function (writing with a relatively narrow second line width) are of the same color, and the second ink has a lower brightness than the first ink. This allows for good visibility of both text, etc., superimposed with the first ink, and text, etc. written with the second ink. Furthermore, even when portions written with the first ink and portions written with the second ink are mixed in a note, a sense of unity is maintained. Consequently, a writing utensil with high user satisfaction can be obtained.

[0031] In the writing instrument according to the first aspect, it is also preferable that the second ink has a higher lightness than the first ink.

[0032] According to this configuration, when characters and the like are written with the second ink, characters and the like that are easily visible and bright can be written.

[0033] Furthermore, in the writing instrument according to the second aspect, it is also preferable that the chroma of the second ink is higher than the chroma of the first ink.

[0034] According to this configuration, when characters and the like are written with the second ink, characters and the like can be written with high visibility, clearly, and conspicuously.

[0035] Alternatively, in the writing instrument according to the second aspect, it is also preferable that the chroma of the second ink is lower than the chroma of the first ink.

[0036] According to this configuration, when characters or the like are written with the second ink, low-key characters or the like that are visible but inconspicuous can be written.

[0037] Preferably, in each of the above-mentioned writing utensils, it is characterized in that:

[0038] The first ink contains a resin pigment.

[0039] According to this configuration, it is possible to easily express colors with low saturation and colors with high lightness.

[0040] Preferably, in each of the above-mentioned writing utensils, it is characterized in that:

[0041] The second ink contains a dye.

[0042] According to this configuration, any color can be easily expressed.

[0043] Preferably, in each of the above-mentioned writing utensils, it is characterized in that:

[0044] The pen tip for the first writing function is arranged at one end of the barrel, and the pen tip for the second writing function is arranged at the other end of the barrel.

[0045] According to this configuration, the first writing function and the second writing function can be incorporated into one writing implement with a simple configuration.

[0046] Preferably, in each of the above-mentioned writing utensils, it is characterized in that:

[0047] The ink retaining portion includes a first ink retaining portion that retains the first ink and a second ink retaining portion that retains the second ink without contacting the first ink.

[0048] According to this configuration, it is possible to avoid mixing of the first ink and the second ink.

[0049] Preferably, in each of the above-mentioned writing utensils, it is characterized in that:

[0050] The first ink retaining portion retains a larger amount of the first ink than the second ink retaining portion retains a larger amount of the second ink.

[0051] It is believed that under normal usage, the first ink used for writing with a relatively wide line width tends to be consumed more than the second ink used for writing with a relatively narrow line width. According to this structure, the time it takes for the two inks to run out can be close, which can improve user satisfaction.

[0052] Effects of the Invention

[0053] According to the present invention, a writing instrument with high user satisfaction can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a diagram showing the overall structure of a writing instrument according to an embodiment of the present invention.

[0055] Figure 2 This is a diagram for explaining the approximation of hue.

[0056] Figure 3 The diagram is used to explain the relationship between the visibility obstruction of characters etc. and the chroma of ink when ink is superimposed on the characters etc., and the relationship between the visibility of characters etc. and the chroma of ink when characters etc. are written.

[0057] Figure 4 This diagram explains the relationship between the visibility obstruction of characters and the lightness of ink when ink is superimposed on them, and the relationship between the visibility of characters and the lightness of ink when characters are written.

[0058] Figure 5 This is a diagram for explaining the relationship between the lightness and chroma of the first ink and the lightness and chroma of the second ink.

[0059] Figure 6 This is a diagram used to explain how to use writing utensils.

[0060] Figure 7 This is a diagram for explaining the relationship between the lightness and chroma of the first ink and the lightness and chroma of the second ink in a modified example. DETAILED DESCRIPTION

[0061] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0062] <1. Composition of Writing Utensils>

[0063] Reference Figure 1 The configuration of the writing instrument according to the embodiment will be described. Figure 1 : is a diagram showing the overall structure of the writing instrument P involved in the embodiment. Figure 1 In the figure, for the convenience of explanation, a portion of the barrel 10 is shown in cross section.

[0064] The writing implement P is a so-called multifunctional writing implement having a first writing function of writing with a relatively wide first line width d1 and a second writing function of writing with a relatively narrow second line width d2 (see Figure 6The first writing function enables a method of marking characters by overlapping ink on them (using it as a so-called permanent marker). On the other hand, the second writing function enables a method of writing characters (using it as a so-called signature pen). In other words, the writing implement P according to this embodiment is a multifunctional writing implement having both the function of a permanent marker and the function of a signature pen.

[0065] The specific value of the first line width d1 is preferably about 2 mm to 10 mm (particularly preferably about 3 mm to 6 mm), and the specific value of the second line width d2 is preferably about 0.1 mm to 1.5 mm (particularly preferably about 0.2 mm to 0.6 mm).

[0066] like Figure 1 As shown, the writing instrument P has a so-called double-headed writing instrument structure in which pen tips 11 and 12 are provided at both ends of a barrel 10. Although not shown, each of the two pen tips 11 and 12 is provided with a detachable cap for covering the pen tips 11 and 12 when not in use.

[0067] The pen tip (first pen tip) 11 provided at the end of one side of the barrel 10 is a pen tip for the first writing function, and is formed into a shape suitable for writing with a first line width d1 having a relatively wide width. Specifically, for example, the first pen tip 11 is set to a shape in which the top portion of the cylinder is cut along a relative surface inclined in the opposite direction relative to the center axis, and the top edge 11a is inclined relative to a surface orthogonal to the center axis (a so-called chisel shape). The width d11a of the top edge 11a is set to, for example, about 3 mm to 6 mm. If such a first pen tip 11 is used, a line having a width as wide as the width d11a of the top edge 11a can be written. That is, by appropriately adjusting the width d11a, a pen tip ( Figure 6 (a)).

[0068] The pen tip (second pen tip) 12 provided at the other end of the barrel 10 is a pen tip for the second writing function, and is formed into a shape suitable for writing with a second line width d2 having a relatively narrow width, and presents a shape different from the first pen tip 11. Specifically, for example, the second pen tip 12 is constructed to include a portion (reduced diameter portion) 12a formed into a substantially conical shape that decreases in diameter as it approaches the top, and a cylindrical portion (cylindrical portion) 12b extending from the end of the reduced diameter side. If such a second pen tip 12 is used, it is possible to write a line having a width that is less than or equal to the diameter d12b of the top of the cylindrical portion 12b. For example, by setting the diameter d12b of the top of the cylindrical portion 12b to approximately 0.4mm to 1.5mm, it is possible to write a line having a line width of approximately 0.2mm to 0.6mm. That is, by appropriately adjusting the diameter d12b, it is possible to obtain a pen tip ( Figure 6 (b) etc.) The cylindrical portion 12b is formed to have a substantially constant cross-sectional diameter throughout the entire axial direction, and even if the tip is worn, the tip diameter (and thus the width of the written line) is unlikely to change.

[0069] Specifically, the first and second nibs 11 and 12 can be formed from, for example, a resin-processed fiber body, a fiber body with capillary gaps formed therein, a fusion-processed heat-melting fiber body, a porous member with interconnected pores such as a felt body, a plastic core with ink grooves formed in the axial direction of the plastic material, or a sintered core (porous body) formed by sintering various plastic powders. The materials forming the first and second nibs 11 and 12 can be the same or different.

[0070] The barrel 10 is a cylindrical member that houses two ink retaining portions 21 and 22. The first nib 11 is connected to one ink retaining portion (first ink retaining portion) 21, which holds ink 31 for a first writing function. The second nib 12 is connected to the other ink retaining portion (second ink retaining portion) 22, which holds ink 32 for a second writing function.

[0071] Here, a structure is adopted in which each ink 31, 32 is impregnated and retained in a cotton material (so-called cotton type). That is, each ink holding portion 21, 22 is composed of a reservoir impregnated with each ink 31, 32. The ink 31, 32 impregnated in each ink holding portion 21, 22 is transferred to each pen tip 11, 12 by capillary action, thereby enabling writing with each pen tip 11, 12.

[0072] The first ink retaining portion 21 and the second ink retaining portion 22 are separated so that the inks 31 and 32 retained therein do not contact each other. This prevents the first ink 32 and the second ink 32 from mixing. As shown in the figure, a separator 20 may be provided between the first ink retaining portion 21 and the second ink retaining portion 22. In other words, the interior of the barrel 10 may be divided into two spaces by the separator 20, with each ink retaining portion 21 and 22 being accommodated in each of the divided spaces.

[0073] Furthermore, the volume of the first ink retaining portion 21 is set to be larger than the volume of the second ink retaining portion 22, and the amount of the first ink 31 held in the first ink retaining portion 21 is set to be larger than the amount of the second ink 32 held in the second ink retaining portion 22. Since the first ink 31 is used for writing with a relatively wide first line width d1 and tends to be consumed more than the second ink 32, which is used for writing with a relatively narrow second line width d2, by holding a larger amount of the first ink 31 than the second ink 32, the time at which the two inks 31 and 32 are exhausted can be shortened.

[0074] Both the first ink 31 and the second ink 32 are made by dissolving a colorant in an aqueous solvent (e.g., water). Any color can be expressed by adjusting the color combination of the colorants, the concentration of each colorant after the combination, and the mixing ratio of each colorant after the combination. In other words, any combination of hue, lightness, and chroma can be expressed.

[0075] A resin pigment is used as a colorant in the first ink 31. Specifically, the first ink 31 is an ink containing a resin pigment. Resin pigments excel at expressing pale colors with low chroma and high lightness, and are therefore suitable for expressing the color C1 (described later) of the first ink 31.

[0076] On the other hand, a dye is used as a colorant in the second ink 32. Specifically, the second ink 32 is an ink containing a dye. Dyes can produce a wide range of deep colors, including high chroma and low lightness, and also provide good color rendering. Therefore, they are suitable for expressing the color C2 (described later) of the second ink 32.

[0077] In the writing implement P having the above structure, the first writing function of writing with a relatively wide first line width d1 can be realized by the first pen tip 11, the first ink holding portion 21 connected thereto, the first ink 31 held therein, and the barrel 10. That is, in the writing implement P, the first ink 31 is supplied to the first pen tip 11, and the user can write by contacting the entire width direction of the top edge 11a of the first pen tip 11 with the paper surface, etc., and thus draw a line with a thick line width d1 corresponding to the width d11a of the top edge 11a. For example, by drawing a line on a text on the paper surface, the first ink 31 can be overlapped on the text to mark it ( Figure 6(a)).

[0078] Furthermore, in the writing implement P, a second writing function of writing with a relatively narrow second line width d2 can be realized by the second pen tip 12, the second ink holding portion 22 connected thereto, the second ink 32 held therein, and the barrel 10. That is, in the writing implement P, the second pen tip 12 is supplied with the second ink 32, and the user writes by contacting the tip of the cylindrical portion 12b of the second pen tip 12 with a paper surface, etc., thereby drawing a line with a thin line width d2 corresponding to the diameter d12a of the tip. For example, fine text, etc. can be written on the paper surface with the second ink 32 ( Figure 6 (b) etc.).

[0079] <2. Ink Color>

[0080] Reference Figures 2 to 5 The color (first ink color) C1 of the first ink 31 and the color (second ink color) C2 of the second ink 32 will be described.

[0081] <2-1. Hue>

[0082] The first ink color C1 and the second ink color C2 are set to be colors of the same family. Colors can be defined by three attributes, for example, hue, saturation, and lightness. Here, "similar colors" refer to colors with the same or similar hue.

[0083] In addition, the "hue similarity" mentioned here means that the angle between the two hues in the hue circle is less than 90 degrees (especially preferably less than 45 degrees). Figure 2 As shown, the hue ring HC arranges hues in a circular ring shape, continuously changing through red, orange, yellow, green, blue, and purple along the circumference. In this hue ring HC, two hues H1 and H2 are considered "similar" if the angle θ formed by them, as viewed from the center of the hue ring HC, is less than or equal to 90 degrees (particularly preferably less than or equal to 45 degrees).

[0084] <2-2. Chroma and Brightness>

[0085] As mentioned above, color is defined not only by hue but also by saturation and lightness. That is, even if the hue is the same, if at least one of saturation and lightness is different, the color will be different.

[0086] The inventors focused on the relationship between the visual obstruction of text etc. when ink is superimposed on the text etc. and the chroma of the ink. Figure 3As schematically shown in (a), the higher the chroma (i.e., as the vividness increases), the greater the visibility obstruction, and the lower the chroma, the lower the visibility obstruction. Furthermore, it is also known that the same tendency exists regardless of hue.

[0087] In addition, the inventors also focused on the relationship between the visibility of text etc. and the color saturation of ink when the text etc. is written on paper etc. Figure 3 As schematically shown in (b), the higher the saturation, the better the visibility, and the lower the saturation, the lower the visibility. It is also known that the same tendency exists regardless of the hue. Figure 3 In the figures referenced later, chroma is expressed as line thickness, but this is obviously only for ease of illustration.

[0088] Furthermore, the inventors also focused on the relationship between the visual obstruction of the text etc. when the ink is superimposed on the text etc. and the brightness of the ink. Figure 4 As schematically shown in (a), the lower the lightness (i.e., as it approaches black), the higher the visibility obstruction, and the higher the lightness (i.e., as it approaches white), the lower the visibility obstruction. Furthermore, it is also known that the same tendency exists regardless of hue.

[0089] In addition, the inventors also focused on the relationship between the visibility of text etc. and the brightness of ink when writing text etc. on paper etc. Figure 4 As schematically shown in (b), the lower the brightness, the better the visibility, and the higher the brightness, the lower the visibility. It is also known that no matter what the hue is, it has the same tendency. In addition, although Figure 4 In the figures referenced later, brightness is expressed as line density, but this is obviously only for ease of illustration.

[0090] Hereinafter, a technical solution for defining the lightness and chroma of the first ink color C1 and the second ink color C2 based on such new knowledge will be described.

[0091] The lightness and chroma of the first ink color C1 and the lightness and chroma of the second ink color C2 are set to form a predetermined relative relationship. In the following, for easier understanding, the lightness and chroma of the first ink color C1 are determined first, and then the lightness and chroma of the second ink color C2 are determined so as to form a predetermined relative relationship therewith. However, it is also possible to first determine the lightness and chroma of the second ink color C2, and then determine the lightness and chroma of the first ink color C1 so as to form a predetermined relative relationship therewith. Furthermore, the lightness and chroma of the first ink color C1 and the lightness and chroma of the second ink color C2 can also be adjusted in parallel, and ultimately converge to values ​​that form a predetermined relative relationship.

[0092] Here, first determine the lightness and chroma of the first ink color C1. As described above, the visual obstruction of the text etc. when ink is superimposed on the text etc. depends on the chroma and lightness. Here, the lightness and chroma of the first ink color C1 are set to a combination that makes the visual obstruction of the text etc. when the first ink 31 is superimposed on the text etc. sufficiently low. As described above, since the lower the chroma, the lower the visual obstruction, when the chroma is set to a lower value, a lower lightness can be selected. In addition, since the higher the lightness, the lower the visual obstruction, when the lightness is set to a higher value, a higher chroma can be selected. In addition, the range of selectable lightness and chroma also varies according to the selected hue.

[0093] Next, the lightness and chroma of the second ink color C2 are determined. The lightness and chroma of the second ink color C2 are set to form a predetermined relative relationship with the lightness and chroma of the first ink color C1. That is, a plane coordinate ( Figure 5 ), when the lightness and chroma combination of the first ink color C1 determined previously is placed at the origin of the plane coordinates, the lightness and chroma combination of the second ink color C2 is selected from the coordinate values ​​located in the second quadrant Q2 or the third quadrant Q3.

[0094] Comparing the case where the lightness and chroma combination of the second ink color C2 is set to coordinate values ​​located in the second quadrant Q2 with the case where it is set to coordinate values ​​located in the third quadrant Q3, the former tends to result in a higher (brighter) chroma of the second ink color C2, while the latter tends to result in a lower chroma of the second ink color C2. Therefore, hereinafter, the former is referred to as "high chroma type Q2," and the latter is referred to as "low chroma type Q3."

[0095] (High chroma type Q2)

[0096] As described above, as the lightness decreases, the visibility of written characters improves. In the high-saturation type Q2, the lightness of the second ink color C2 is set lower than that of the first ink color C1. Therefore, the visibility of written characters can be improved when written with the second ink 32.

[0097] As described above, as the saturation increases, the visibility of written characters improves. In the high-saturation type Q2, the saturation of the second ink color C2 is set higher than the saturation of the first ink color C1. Therefore, the visibility of written characters can be sufficiently high when written with the second ink 32.

[0098] That is, by setting the brightness of the second ink color C2 to be lower than the brightness of the first ink color C1, and setting the chroma of the second ink color C2 to be higher than the chroma of the first ink color C1, the visibility of the text, etc. written with the second ink 32 can be increased, and at the same time, the visibility obstruction of the text, etc. when the first ink 31 is overlapped on the text, etc. can be reduced (that is, the visibility of the text, etc. overlapped with the first ink 31 can be increased).

[0099] Furthermore, since the vividness of the color increases with increasing saturation, in the high-saturation type Q2, when writing text or the like with the second ink 32, the text or the like appears vivid. This function is useful, for example, when writing text that is clearer and more conspicuous than with a pencil or mechanical pencil.

[0100] (Low saturation type Q3)

[0101] As described above, as the lightness decreases, the visibility of written characters improves. In the low-saturation type Q3, the lightness of the second ink color C2 is set lower than the lightness of the first ink color C1. Therefore, the visibility of written characters can be improved when written with the second ink 32.

[0102] That is, by setting the brightness of the second ink color C2 lower than the brightness of the first ink color C1, the visibility of the text, etc. written with the second ink 32 can be increased, while the visibility of the text, etc. when the first ink 31 is overlapped on the text, etc. can be reduced.

[0103] As mentioned above, the visibility of written text improves with increasing saturation. However, in the low-saturation type Q3, the saturation of the second ink color C2 is set lower than that of the first ink color C1. Because color vividness decreases with decreasing saturation, in the low-saturation type Q3, when writing text with the second ink 32, the text appears in a color with subdued vividness. This function is useful, for example, when writing text that is discreet (i.e., less conspicuous) while being distinguishable from text written with a pencil or mechanical pencil.

[0104] Furthermore, while setting the chroma of the second ink color C2 to a low saturation reduces the visibility of text, etc., when written with the second ink 32, this can be compensated for by adjusting the brightness. In other words, in the low-saturation type Q3, the visibility of text, etc., when written with the second ink 32, is ensured by adjusting the brightness of the second ink color C2.

[0105] <3. Usage>

[0106] Next, the usage of the writing implement P will be described using the case of taking class notes as an example.

[0107] The teacher teaches while writing on the blackboard, and the students write down the contents of the blackboard in their notes using pencils or mechanical pencils. The teacher often emphasizes a specific part of the blackboard writing by saying "this part is important" or "remember this part". In this case, the student taking notes can mark the part by writing with the first pen tip 11 of the writing tool P in a manner of overlapping ink from the indicated part ( Figure 6 (a) As described above, the first ink 31 supplied to the first pen tip 11 is set to the color C1 that does not reduce the visibility of text even if the first ink 31 overlaps text. Therefore, the text overlapped with ink (i.e., the marked text) can be clearly read.

[0108] In addition, the teacher sometimes says "this part will appear in the exam" about the emphasized part, and many students want to record the opinion in their notes. In this case, the student can use the second pen tip 12 of the writing tool P to write the teacher's opinion ( Figure 6 (b) As described above, the second ink 32 supplied to the second pen tip 12 is set to the color C2, which is highly visible for characters and the like written with the second ink 32. Therefore, clearly readable characters and the like can be written.

[0109] It is believed that, especially in such situations, students want to write text more clearly and prominently than with pencil or mechanical pencil. In this regard, the high-saturation Q2 second ink 32 is preferred. Specifically, the high-saturation Q2 second ink 32 has a high saturation, allowing for the writing of vibrant text, which is clearer and more prominent than with pencil or mechanical pencil.

[0110] In addition, teachers often insert supplementary explanations (for example, small knowledge given as "By the way...", stories used to expand the content of the lecture, etc.) between the main explanations of the lecture, and many students want to record these supplementary explanations that are not written on the blackboard in their notes. In such cases, students can use the second pen tip 12 of the writing tool P to record the supplementary explanations ( Figure 6 (c) As described above, the second ink 32 supplied to the second pen tip 12 is set to the color C2, which is highly visible for characters and the like written with the second ink 32. Therefore, clearly readable characters can be written.

[0111] It is believed that, especially in such a case, students want to write inconspicuous and low-key text while being able to distinguish it from the text written with a pencil or a mechanical pencil. In this regard, the second ink 32 of low-chroma type Q3 is preferably used. That is, if the second ink 32 of low-chroma type Q3 has a low chroma, it is possible to write text with a color that has suppressed vividness, and to write low-key and inconspicuous text. In addition, even if it is a color that has suppressed vividness, it is possible to easily distinguish the part written with the second ink 32 and the part written with a pencil or a mechanical pencil. Therefore, for example, in the above-mentioned case, when looking back at the notes later, it is possible to clearly distinguish the part copied on the blackboard and the part that is not written on the blackboard but supplemented by oneself.

[0112] If you take notes in this way, the notes will contain a mixture of text written with a pencil or mechanical pencil, portions marked with the first ink 31, and text written with the second ink 32. However, since the first ink 31 and the second ink 32 are of the same color (same color family), the notes appear unified when viewed as a whole, creating a less cluttered impression and resulting in a more aesthetically pleasing appearance. Furthermore, the portions marked with the first ink 31 and the text written with the second ink 32 can be linked.

[0113] Furthermore, if the first ink 31 is used to mark text written with the second ink 32, two colors that are of the same color, lightness, or chroma but differ in at least one aspect will overlap. This creates a unified and harmonious soft impression while also producing a striking expression. In other words, it is possible to create a new expression that cannot be produced using existing writing utensils. In particular, since a resin pigment is used as the colorant for the first ink 31 and a dye is used as the colorant for the second ink 32, even if the first ink 31 is used to mark text written with the second ink 32, the two inks 31 and 32 are difficult to mix. Therefore, the written text is difficult to penetrate.

[0114] <4. Effect>

[0115] The writing instrument P according to the above-described embodiment has a first writing function for writing with a first line width d1 and a second writing function for writing with a second line width d2 that is narrower than the first line width d1. Furthermore, the first ink 31 used for the first writing function and the second ink 32 used for the second writing function are of the same color family, and the chroma of the second ink 32 is higher than that of the first ink 31 (high chroma type Q2). Alternatively, the first ink 31 and the second ink 32 are of the same color family, and the lightness of the second ink 32 is lower than that of the first ink 31 (high chroma type Q2, low chroma type Q3). In either configuration, the visibility of characters, etc., superimposed with the first ink 31, and the visibility of characters, etc., written with the second ink 32, etc., can be improved (i.e., the usability as a marker pen and the usability as a felt pen are both achieved). Furthermore, even if the portion written with the first ink 31 and the portion written with the second ink 32 are mixed in a note, a sense of unity can be achieved. Thus, a writing instrument with high user satisfaction can be obtained.

[0116] Furthermore, in the writing instrument P according to the above-described embodiment, the second ink 32 has a lower lightness than the first ink 31, and a higher chroma than the first ink 31 (high chroma type Q2). With this configuration, when writing text, etc., with the second ink 32, the text can be written clearly and conspicuously with high visibility.

[0117] Alternatively, in the writing instrument P according to the above-described embodiment, the second ink 32 has a lower lightness than the first ink 31, and the second ink 32 has a lower chroma than the first ink 31 (low-chroma type Q3). With this configuration, when writing text or the like with the second ink 32, it is possible to write low-key text or the like that is both easily visible and inconspicuous.

[0118] In the writing instrument P according to the above embodiment, the first ink 31 contains a resin pigment. This configuration makes it possible to easily express a color with a low saturation or a color with a high lightness.

[0119] In the writing instrument P according to the above embodiment, the second ink 32 contains a dye. This configuration makes it possible to easily express an arbitrary color.

[0120] Furthermore, in the writing instrument P according to the above-described embodiment, a resin pigment is used as the colorant for the first ink 31, and a dye is used as the colorant for the second ink 32. This configuration prevents the two inks 31 and 32 from intermingling even when writing overlaps. Therefore, for example, even if the first ink 31 is used to mark text already written with the second ink 32, the text will not easily bleed through.

[0121] Furthermore, in the writing instrument P according to the above-described embodiment, the pen tip (first pen tip) 11 for the first writing function is provided at one end of the barrel 10, and the pen tip (second pen tip) 12 for the second writing function is provided at the other end of the barrel 10. With this configuration, the first and second writing functions can be incorporated into a single writing instrument with a simple configuration.

[0122] Furthermore, the writing instrument P according to the above embodiment includes the first ink retaining portion 21 for retaining the first ink 31 and the second ink retaining portion 22 for retaining the second ink 32 without contacting the first ink 31. This configuration prevents the first ink 31 and the second ink 32 from mixing.

[0123] Furthermore, in the writing instrument P according to the above-described embodiment, the first ink retaining portion 21 holds a larger amount of first ink 31 than the second ink 32 in the second ink retaining portion 22. It is believed that, under normal usage, the first ink 31 used for writing with the relatively wide first line width d1 tends to be consumed more than the second ink 32 used for writing with the relatively narrow second line width d2. This configuration allows the two inks 31 and 32 to be used up at a similar time, thereby improving user satisfaction.

[0124] <5. Modifications>

[0125] In the above embodiment, when the combination of lightness and chroma of the first ink color C1 is placed at the origin of the plane coordinates with the vertical axis representing chroma and the horizontal axis representing lightness, the combination of lightness and chroma of the second ink color C2 is selected from the coordinate values ​​located in the second quadrant Q2 or the third quadrant. However, it may also be as follows: Figure 7 As shown, the lightness and chroma combination of the second ink color C2 is selected from the coordinate values ​​located in the first quadrant Q1. In other words, the chroma of the second ink 32 may be higher than the chroma of the first ink 31, and the lightness of the second ink 32 may be higher than the lightness of the first ink 31.

[0126] In this case, since the chroma of the second ink color C2 is higher than that of the first ink color C1, the visibility of the text etc. written with the second ink 32 can be improved. In other words, by setting the chroma of the second ink color C2 higher than that of the first ink color C1, the visibility of the text etc. written with the second ink 32 can be improved, and the visibility of the text etc. can be reduced when the first ink 31 overlaps the text etc.

[0127] Furthermore, in this case, since the lightness of the second ink color C2 is set higher than that of the first ink color C1, bright text can be written using the second ink 32. Furthermore, while the visibility of text written using the second ink 32 may be reduced if the lightness of the second ink color C2 is set higher, this can be compensated for by adjusting the saturation. In other words, the visibility of text written using the second ink 32 is ensured by adjusting the saturation of the second ink color C2.

[0128] In this way, by setting the chroma of the second ink 32 higher than the chroma of the first ink 31 and setting the brightness of the second ink 32 higher than the brightness of the first ink 31, when characters are written with the second ink 32, they can be written with visibility and brightness.

[0129] Alternatively, when the lightness and chroma combination of the first ink color C1 is placed at the origin of a plane coordinate system with chroma on the vertical axis and lightness on the horizontal axis, the lightness and chroma combination of the second ink color C2 can also be selected from the coordinate values ​​on the axis R1 between the first quadrant Q1 and the second quadrant Q2, or the coordinate values ​​on the axis R2 between the second quadrant Q2 and the third quadrant Q3. In other words, the lightness can be made the same while only the chroma is made different (making the second ink color C2 higher), or the chroma can be made the same while only the lightness is made different (making the second ink color C2 lower).

[0130] In the former case, the chroma of the second ink color C2 is higher than that of the first ink color C1. In the latter case, the lightness of the second ink color C2 is lower than that of the first ink color C1. Therefore, in either case, the visibility of text, etc. written with the second ink 32 can be improved. In other words, in either case, the visibility of text, etc. written with the second ink 32 can be improved, while the obstruction to the visibility of the text, etc. when the first ink 31 overlaps the text, etc. can be reduced.

[0131] In the above embodiment, a resin pigment is used as the colorant for the first ink 31, but this is not a necessary requirement. For example, a pigment or dye other than a resin pigment may be used as the colorant for the first ink 31. Furthermore, various additives such as a thickener may be added.

[0132] In the above embodiment, a dye is used as the colorant for the second ink 32. However, this is not a necessary requirement. For example, a resin pigment or a pigment other than a resin pigment may be used as the colorant for the second ink 32. Furthermore, various additives such as a thickener may be added.

[0133] In the above embodiment, the first ink 31 and the second ink 32 are formed by dissolving a colorant in an aqueous solvent. However, the solvent in which the colorant is dissolved does not necessarily have to be aqueous, and may be, for example, oily.

[0134] In the above-mentioned embodiment, although the volume of the first ink retaining portion 21 is set to be larger than the volume of the second ink retaining portion 22, and the retention amount of the first ink 31 of the first ink retaining portion 21 is set to be greater than the retention amount of the second ink 32 of the second ink retaining portion 22, the volumes of each ink retaining portion 21, 22 (and even the retention amounts of each ink 31, 32) may also be the same.

[0135] In the above embodiment, the writing instrument P is a so-called double-ended writing instrument having pen tips 11 and 12 provided at both ends of the barrel 10. However, 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 retracted from one end of the barrel 10 in response to a user's knock operation.

[0136] In the above-mentioned embodiment, although the writing tool P is provided with one set each of the first pen tip 11 for realizing the first writing function and the first ink holding portion 21 connected thereto, and one set each of the second pen tip 12 for realizing the second writing function and the second ink holding portion 22 connected thereto, the number of each pen tip 11, 12, etc. is not limited to this.

[0137] For example, the writing instrument may include a first pen tip 11 for performing a first writing function and a first ink retaining portion 21 connected thereto, and two second pen tips 12 for performing a second writing function and second ink retaining portions 22 connected thereto. Furthermore, in such a configuration, the first ink retaining portion 21 may retain the first ink 31, one second ink retaining portion 22 may retain the second ink 32 of the same color family as the first ink 31, which is a high-saturation Q2 ink, and the other second ink retaining portion 22 may retain the second ink 32 of the same color family as the first ink 31, which is a low-saturation Q3 ink.

[0138] Alternatively, for example, the writing instrument may include two sets of first nibs 11 for performing a first writing function and first ink retaining portions 21 connected thereto, and two sets of second nibs 12 for performing a second writing function and second ink retaining portions 22 connected thereto. In this case, the first ink retaining portion 21 and the second ink retaining portion 22 may each retain a first ink 31 and a second ink 32 of a first, similar color, while the first ink retaining portion 21 and the second ink retaining portion 22 may each retain a first ink 31 and a second ink 32 of a second, similar color.

[0139] The shapes of the nibs 11 and 12 in the above-described embodiments may be modified as appropriate. For example, the first nib 11 may be configured such that the top portion of the cylinder is cut along opposite surfaces inclined in the opposite directions relative to the central axis, and the top edge is perpendicular to the central axis. Alternatively, for example, the nib may be configured such that the cross section is flattened and the top portion is cut obliquely relative to a surface perpendicular to the central axis. Alternatively, for example, the nib may be configured such that the cross section is flattened and the top portion is cut obliquely relative to a surface perpendicular to the central axis.

[0140] In the above-mentioned embodiment, although the so-called cotton type is adopted in which each ink 31, 32 is impregnated and retained in a cotton material, a structure (so-called straight liquid type) in which each ink 31, 32 is filled and retained in an ink tank may also be adopted. That is, each ink holding portion may also be composed of an ink tank. In this case, it is preferable that, with respect to each ink tank, in order to prevent the inks 31, 32 stored in each ink tank from contacting each other, at least the respective internal spaces (ink storage spaces) are separated and independently arranged. In addition, in this case, the capacity of the ink tank filled with the first ink 31 may be set to be larger than the capacity of the ink tank filled with the second ink 32. In addition, in this case, as a method of supplying the ink 31, 32 in each ink tank to each pen tip 11, 12, various existing methods such as the so-called valve type and accordion type may be adopted.

[0141] In the writing instrument P according to the above-described embodiment, specific technical means for realizing the first writing function and the second writing function are not limited to those described above.

[0142] For example, the first writing function can also be achieved by a so-called transfer roller. Specifically, for example, it can be a pen tip including a cylindrical roller supported by an axis so as to be rotatable around the axis, and a mechanism for supplying the first ink 31 to the surface of the roller, thereby achieving the first writing function. In this case, by sliding and rolling the roller provided on the pen tip on the paper, a line having a line width corresponding to the width of the roller can be written with the first ink 31. In such a structure, by appropriately setting the width of the roller, a line of arbitrary line width can be written. That is, by appropriately setting the width of the roller, a structure in which a line width d1 having a relatively wide width can be written can be achieved.

[0143] In addition, for example, the first writing function can also be implemented by a so-called soft pen (Japanese: 筆ペン). Specifically, for example, it can include a nib that mimics a pen and a mechanism for supplying the first ink 31 thereto, thereby implementing the first writing function. In such a configuration, if the user applies pen pressure, the nib bends to write a line with a relatively thick line width. The line width of the written line varies according to the size of the nib, the ease of bending, etc. Therefore, by appropriately adjusting these parameters, a configuration capable of writing a line width d1 with a relatively wide width can be achieved.

[0144] In addition, for example, the second writing function can also be implemented by a so-called ballpoint pen. Specifically, for example, it can include a nib with a ball (steel ball) built in and configured to rotate by sliding on the paper surface and a mechanism for supplying the second ink 32 thereto, thereby implementing the second writing function. In this case, by appropriately adjusting the size of the ball, a configuration capable of writing a line width d2 with a relatively narrow width can be achieved.

[0145] In addition, regarding the specific shapes, specifications, other detailed configurations, etc. of each part, various modifications can be made without departing from the gist of the present invention. In addition, of course, the configurations according to the embodiments and the various modification examples can be appropriately combined.

[0146] Explanation of Reference Numerals

[0147] P: Writing implement;

[0148] 10: Shaft tube;

[0149] 11: First nib;

[0150] 12: Second nib;

[0151] 20: Separator;

[0152] 21: First ink holding part;

[0153] 22: Second ink holding part;

[0154] 31: First ink;

[0155] 32: Second ink;

[0156] C1: First ink color;

[0157] C2: Second ink color.

Claims

1. A writing implement having a first writing function for writing with a first line width and a second writing function for writing with a second line width narrower than the first line width, The writing utensil is characterized in that The writing instrument includes a first ink holding portion for holding a first ink for the first writing function and a second ink holding portion for holding a second ink for the second writing function without contacting the first ink. The first ink held by the first ink holding portion and the second ink held by the second ink holding portion are of the same color. The chroma of the second ink held by the second ink holding portion is higher than the chroma of the first ink held by the first ink holding portion, and the lightness of the second ink is higher than the lightness of the first ink.

2. A writing implement having a first writing function for writing with a first line width and a second writing function for writing with a second line width narrower than the first line width, The writing utensil is characterized in that The writing instrument includes a first ink holding portion for holding a first ink for the first writing function and a second ink holding portion for holding a second ink for the second writing function without contacting the first ink. The first ink held by the first ink holding portion and the second ink held by the second ink holding portion are of the same color. The second ink held by the second ink holding portion has a lower lightness than the first ink held by the first ink holding portion, and the second ink has a lower chroma than the first ink.

3. The writing implement according to claim 1 or 2, wherein: The first ink contains a resin pigment.

4. The writing implement according to claim 1 or 2, wherein: The second ink contains a dye.

5. The writing implement according to claim 3, wherein The second ink contains a dye.

6. The writing implement according to claim 1 or 2, wherein: The pen tip for the first writing function is arranged at one end of the barrel, and the pen tip for the second writing function is arranged at the other end of the barrel.

7. The writing implement according to claim 1 or 2, wherein: The first ink retaining portion retains a larger amount of the first ink than the second ink retaining portion retains a larger amount of the second ink.

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