JP2011046008A - Writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing implement which allows the opposite side of a pen body which serves as a pen point to be easily recognized with the eye, and also, a terminal position of line drawing to be easily checked and further, the timing of ink exhaustion to be easily confirmed. <P>SOLUTION: The writing implement A serves for writing by feeding an internal ink of the pen body 10 to the pen point 30. In addition, the pen point 30 is constituted of a porous material, and the ink indicating the difference in the refractive index of not more than 0.1 between the porous material constituting the porous body and the ink, is supplied to the porous body serving as the pen point 30. Consequently, the porous body (a pen part 31) is used as a visual recognition part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a writing instrument such as a marking pen that can be written by supplying ink in the pen body to the pen tip, and more specifically, the opposite side of the pen body that is the pen tip can be easily seen, and the end point position of the drawing It is related with the writing instrument which can recognize easily and the end time of ink can also be recognized easily.

  Conventionally, as a writing instrument that can easily recognize the opposite side of the pen body that is the pen tip and that can easily recognize the end point position of the drawing, for example, it has a pen body that can guide and hold the ink supplied from the writing instrument body In the writing instrument, the pen body includes an ink guiding portion and a writing portion that derives ink from the ink guiding portion and obtains a fixed line width, and has a writing direction on an upper side of the writing portion in the axial direction. A writing instrument having a visible part that can be visually recognized (for example, see Patent Document 1 by the present applicant) is known.

In addition, the ink end sign can be reliably displayed, the part of the writing direction that is the shadow of the shaft cylinder or writing part can be visually confirmed, and as an ink end detection type writing instrument that is visually interesting and aesthetically superior, for example, A writing instrument that supplies ink impregnated in the ink occlusion body in the shaft cylinder to a pen tip serving as a writing portion, and the ink impregnated in the ink occlusion body is supplied to the pen tip via an ink guiding portion, In the ink end detection type writing instrument for detecting the end of the ink of the occlusion body by visually recognizing the ink guiding part, the writing instrument has at least a part of the shaft tube or a visible part capable of visually recognizing the writing direction. A characteristic ink end detection type writing instrument (see, for example, Patent Document 2 by the applicant of the present application) is known.
These writing instruments have an unprecedented simple structure, the other side of the pen body that is the pen tip can be easily seen, the end point of drawing can be easily recognized, and the end time of ink can also be easily recognized. It is excellent in that it can.

However, in Patent Document 1, the pen body includes an ink guiding portion and a writing portion that derives ink from the ink guiding portion and obtains a constant line width, and is arranged on the upper side in the axial direction of the writing portion. Since it has a structure including a visible part made of a transparent member, etc., which is a separate member capable of visually recognizing the writing direction, a part of the nib is designed to be a visible part by design. There are some problems in that it must be done.
Moreover, in the said patent document 2, the completion | finish signature of an ink is what visually recognizes an ink induction | guidance | derivation member, Furthermore, the structure provided with the visible part used as another member which can visually recognize the writing direction in a part of shaft cylinder or a writing part. Therefore, in order to produce the ink guiding member, it is necessary to seal the ink, and there are some problems in that the number of parts is increased.

Japanese Patent No. 3821609 (Claims, Examples, etc.) JP-A-2005-246606 (Claims, Examples, etc.)

  The present invention is to solve this problem in view of the problems and current situation of the prior art described above, and without providing a visible part as a visible part as a separate part on a part of the conventional pen tip or shaft, An object is to provide a writing instrument that can easily recognize the opposite side of the pen body as the pen tip, easily recognize the end point of the drawing, and easily recognize the end time of the ink with a simple configuration. And

  The present inventor, in view of the above-mentioned conventional problems, etc., as a result of earnest research, in the writing instrument that can be written by supplying ink in the pen body to the pen tip, the pen tip is composed of a porous body, By making the refractive index of the porous material constituting the porous body and the ink close to a specific range, the visual recognition part can be easily formed on the pen tip, and a writing instrument provided with the visual recognition part can be obtained at low cost. The present invention has been completed.

That is, the present invention resides in the following (1) to (6).
(1) In a writing instrument that enables writing by supplying ink in the pen body to the pen tip, the pen tip is made of a porous material, and the difference in refractive index between the porous material constituting the porous material and the ink A writing instrument, wherein an ink with a water content of 0.1 or less is supplied to a porous body serving as a pen tip, whereby the porous body becomes a visual recognition part.
(2) The writing instrument as described in (1) above, wherein the refractive index of the porous material is in the range of 1.34 to 1.60.
(3) The writing instrument as described in (1) or (2) above, wherein the refractive index of the ink is in the range of 1.33 to 1.50.
(4) The writing instrument as described in any one of (1) to (3) above, wherein the thickness of the porous body serving as the visual recognition part in the visual recognition direction is 50 μm to 2 mm.
(5) The writing instrument as described in any one of (1) to (4) above, wherein the visual recognition portion to which ink is supplied transmits visible light by 40% or more.
(6) The writing instrument as described in any one of (1) to (5) above, wherein the visible part becomes opaque when the ink is used up.
The “refractive index” defined in the present invention refers to the ratio of the angle at which the light traveling straight changes the boundary traveling direction of different substances, and is associated with the light angle according to Snell's law.
Further, “the difference in refractive index between the porous body and the ink is 0.1 or less” means that the difference between the refractive index of the porous material constituting the pen tip and the refractive index of the ink component is 0.1 or less. That means.

According to the present invention, when the refractive index difference between the porous material constituting the nib and the ink is selected to be 0.1 or less, the porous body that becomes the nib in the state where the ink is supplied is transparent or translucent. Thus, a visual recognition part is formed, and a writing instrument that can easily recognize the opposite side of the pen tip via the visual recognition part and can easily recognize the end point position of the drawing is obtained.
In addition, in the writing instrument of the present invention, when the ink is used up and the supply of the ink is stopped, the visible portion is not transparent or translucent and becomes opaque (non-visible portion), so that the end of the ink can be easily confirmed. It will be a thing.

It is a longitudinal cross-sectional view of the writing instrument which shows an example of embodiment of this invention. An example of the porous body used as the pen tip in the writing instrument of FIG. 1 is shown, (a) is a front view, (b) is a side view. It is a fragmentary longitudinal cross-section in the case of becoming the use condition (a pen point is a visual recognition part) in the writing instrument which shows an example of embodiment of this invention. The other example of the nib in the writing instrument of this invention is shown, (a) is a front view, (b) is XX sectional drawing of (a).

Hereinafter, embodiments of the present invention will be described in detail.
1 to 3 show a writing instrument according to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of the writing instrument, FIG. 2 (a) is a front view of a porous body serving as a pen tip, and FIG. FIG. 3 is a partial vertical cross-sectional view of an aspect in which the pen tip, which is a use state of the writing instrument, becomes a visual recognition unit.
The writing tool A of the present embodiment is a marking pen type writing tool, and includes a shaft cylinder 10 that becomes a pen body (writing tool body), an ink occlusion body 20, a pen tip 30, and a tail plug 40, as shown in FIG. It has a structure.
The shaft tube 10 is formed of, for example, a thermoplastic resin, a thermosetting resin, glass, or the like, and includes a main body 11 that houses an ink occlusion body 20 impregnated with ink for writing instruments, and a pen made of a porous material. A tip shaft portion 12 for fixing the pen portion 31 on the front side of the tip 30 and an annular holding portion 13 for holding the relay portion 32 on the rear side of the pen tip 30 are provided.

The ink occlusion body 20 is impregnated with ink for writing instruments such as water-based ink and oil-based ink. For example, natural fibers, animal hair fibers, polyacetal resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins. Resin, polyolefin-based resin, polyvinyl-based resin, polycarbonate-based resin, polyether-based resin, polyphenylene-based resin or other fiber bundles, processed fiber bundles such as felt, and sponge , Including porous bodies such as resin particles and sintered bodies. The ink occlusion body 20 is accommodated in the main body 11 of the shaft tube 10.
The rear end opening of the shaft tube 10 is sealed with a tail plug 40 formed of the same material as that of the shaft tube 10 or another synthetic resin material.

The ink used in the present invention is not particularly limited as long as the difference in refractive index between the porous material constituting the pen tip and the ink is 0.1 or less, such as water-based ink and oil-based ink. The refractive index of the whole ink can be adjusted in the range of 1.33 to 1.50 from the point of making the porous body a good visual recognition part that is further excellent in transparency. Desirably, it can be adjusted by suitably combining a color material, a solvent, an optional component, and the like, which are ink components to be used.
As each component that can be specifically used, as a solvent, for example, water (purified water, ion exchange water, distilled water, etc.), ethanol, glycerin, ethylene glycol, propylene glycol monomethyl ether, methylcyclohexane, xylene, silicone, etc. In addition, dyes, pigments, and the like can be used as the color material used in the ink. When the dye is used, the ink is more transparent, and when the pigment is used, the transparency is lowered. Therefore, when the dye ink is used, the transparency tends to be easily imparted. Furthermore, other optional components that are usually used, for example, a fixing agent, a dispersing agent, an activator, a wetting agent, a preservative, and the like can be contained within a range not impairing the effects of the present invention.

The pen tip 30 serving as a writing part is composed of a porous material, and can efficiently supply the ink of the ink occlusion body 20 to the pen part 31 and can perform good writing with the pen part 31 and refracting the ink. Although it will not specifically limit if the difference with a rate will be 0.1 or less, Preferably, the porous material from which a refractive index will be 1.34-1.60 can be selected. When a member in this range is selected, the difference from the refractive index of the ink can be efficiently reduced to 0.1 or less, and even when the ink is supplied, the transparency of the visual recognition part becomes more sufficient, and the writing direction is changed. Further, it can be visually recognized with certainty.
Examples of the porous material that can be used include a fluorine resin, a vinyl resin, a polyolefin resin (PP, PE, etc.), a polystyrene resin (PS), a polyester resin (PET, etc.), and a polyethylene naphthalate resin. (PEN) and other various resins. Preferably, a resin having a low refractive index is desirable. In particular, examples of the low refractive index resin include fluorine-based resins such as polytetrafluoroethylene and tetrafluoroethylene / hexafluoropropylene copolymer. Moreover, as the structure of the porous body, if the difference from the refractive index of the ink is 0.1 or less, the form includes a sintered body, a sponge, a fiber core, and the like.

Also, the pen tip 30 is such that the porous body becomes a visual recognition portion when ink having a difference in refractive index between the porous body constituting the pen tip 30 and the ink of 0.1 or less is supplied to the porous body. Yes, from the viewpoint of further improving the visibility (transparency), the thickness in the viewing direction of the porous body to be the viewing portion is 50 μm to 2 mm, from the viewpoint of further visibility and the strength of the writing portion, etc. It is desirable to set it as 100 micrometers-1.5 mm.
When the thickness of the porous body is less than 50 μm, the viewing portion is highly transparent, but the ink outflow amount is small, and the writing lines are blurred. On the other hand, when the thickness of the porous body that becomes the visual recognition portion exceeds 2 mm, the amount of ink outflow is large, but the transparency of the visual recognition portion becomes insufficient and the writing direction cannot be visually recognized.
In addition, when the difference in refractive index between the porous body and the ink exceeds 0.1, the porous body does not become a visual recognition part (visualization) even if ink is supplied to the porous body, and exhibits the intended effect. Can not be.
In addition, the drawing line width of the pen part 31 used as a writing part becomes a drawing line width of a normal marking pen, and it is desirable that it is at least 2 mm or more, preferably 3 mm or more.

  Furthermore, it is preferable that the visual recognition part which becomes the pen tip to which the ink is supplied transmit visible light of 40% or more, and more preferably 60% or more. The visible light transmittance of 40% or more can be achieved by suitably combining the ink used, the porous material, and the thickness. When this transmittance is 40% or more, the opposite side that is the other side of the visual recognition part can be visually recognized, and even if the transmittance is less than 40%, the other side of the visual recognition part can be confirmed. In some cases, characters cannot be identified. The “visible light transmittance” defined in the present invention represents the visible light amount that has passed through the visual recognition part / the visible light quantity that has entered the visual recognition part as a percentage.

In the writing instrument A of the present embodiment configured as described above, as shown in FIGS. 1 to 3, the ink in the ink occlusion body 20 in the shaft cylinder 10 serving as a pen body passes through the relay portion 32 of the pen tip 30 and writes. It is possible to write by being supplied to the pen unit 31 serving as a unit. At this time, ink having a refractive index difference of 0.1 or less between the porous material constituting the nib 30 and the ink is supplied to the pen part 31 serving as the writing part of the pen nib, thereby constituting the porous body. Since the pen portion 31 that has been a non-viewing portion until now becomes a transparent viewing portion, the portion behind the writing instrument in the writing direction is surely secured through the entire pen portion 31 that becomes the viewing portion. Can be visually recognized.
In addition, since the refractive index difference with the porous material exceeds 0.1 due to the ink running out, the entire pen portion 31 that becomes the visual recognition portion becomes opaque, and an ink end sign is obtained. The end can be detected.
Note that the peripheral surface of the shaft tube 10 of the present embodiment is colored (for example, white is opaque or the material is opaque, and the inside of the shaft tube cannot be visually recognized. Only the pen tip 30 (pen portion 31) is provided.

FIG. 4 shows another example of the pen tip in the writing instrument of the present invention, where (a) is a front view and (b) is a side view.
The configuration of the writing unit other than the nib 30 of the present embodiment can be used in the same manner as the writing instrument A using the shaft tube 10 and the ink occlusion body 20 similar to those in FIG.
The pen tip 30 of the present embodiment has a front pen portion 31 and a rear relay portion 32 that are made of a porous material as in the above-described embodiment, and is different from the pen portion 31 that reinforces the pen portion 31. It is comprised from the protection member 33 which consists of members.

The pen tip 30 according to the present embodiment has a slightly poor visibility when the porous body portion in the viewing direction is thickened. Therefore, as shown in FIG. For example, the pen portion 31 of the pen tip 30 is reinforced by the protection member 33 due to a lack of strength. The protective member 33 is preferably made of a transparent resin such as an acrylic resin, and both side surfaces and rear end portions on the upper side in the axial direction of the pen portion 31 (front side portion of the relay portion 32). It is attached so as to surround.
In the writing instrument using the pen tip 30 having the structure shown in FIG. 4, the writing direction side can be visually recognized through the pen part 31 to which ink is supplied and the protective member 33 having transparency. The entire pen nib (pen part) combined with can be used as the visual recognition part.

  In the writing instrument of the present invention configured as described above, the refractive index of the porous body and the ink constituting the nib is not provided without newly providing a visual recognition part that becomes a transparent member made of a separate member on the conventional nib and shaft cylinder. By using an ink having a difference of 0.1 or less and supplying this ink to the pen part 31 or the like that becomes the pen tip, the pen part 31 or the like can be used as a visual recognition part. A writing instrument can be obtained in which the opposite side of the portion 31 can be easily recognized, the end point position of the drawing can be easily recognized, and the end time of the ink can be easily recognized.

  The writing instrument of the present invention is configured as described above, but is not limited to the above embodiments, and the difference in refractive index between the porous body constituting the pen tip and the ink is 0.1 or less. If the ink is supplied to the pen tip and the pen tip 30 can be made into a transparent visual recognition part, the configuration of other writing instrument parts, ink supply The mechanism and the like are not particularly limited, and may be a direct liquid writing instrument provided with a collector mechanism in which ink is filled in a shaft cylinder (tank) which is a direct writing instrument main body. However, the relay portion 32 may be a relay core that is a separate member, and ink may be supplied from the ink occlusion body 20 to the pen tip 30 (pen portion 31) via the relay core. Marking in form Shows the emission, but felt pen, can be suitably used as a marker for a whiteboard, or the like.

Next, the present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.
The following components were used for each writing instrument.
Moreover, the refractive index of the porous material which comprises the ink used and the nib was measured with the following method.

(Structure of writing instruments)
The used writing instrument is a writing instrument conforming to the writing instrument shown in FIGS.
Shaft cylinder: PP, 110mm x 12φmm
Ink occlusion body: PET fiber batting ", porosity 85% (Unipoint)
Nib: Examples and Comparative Examples Ink: Examples and Comparative Examples

(About measurement of refractive index)
The refractive index was measured using a digital Abbe refractometer DR-A1 (manufactured by Atago Co., Ltd.).

Example 1
A porous body serving as a nib was prepared by sintering using low density PE (refractive index 1.51). The thickness in the viewing direction was 400 μm, and the drawn line width was 5 mm.
The following blend composition was used for the ink component.
Solvent: Silicone (KF56A, manufactured by Shin-Etsu Silicone Co., Ltd., refractive index: 1.495
97% by mass
Coloring material: OIL PINK (Orient Kogyo Co., Ltd.) 1% by mass
Resin: Hitanol 1501 (manufactured by Hitachi Chemical Co., Ltd.) 2% by mass
The refractive index of the entire ink component was 1.50. Further, the difference in refractive index between the porous body and the ink was 0.01.
A writing instrument based on FIGS. 1 to 3 was prepared using the porous material, ink, and the like.

(Example 2)
A porous body serving as a pen tip was prepared by sintering using a tetrafluoroethylene / hexafluoropropylene copolymer (refractive index: 1.34). The thickness in the viewing direction was 400 μm, and the drawn line width was 5 mm.
The ink used was the fluorescent ink used in PUS102T. The refractive index of water used as the solvent is 1.33.
The refractive index of the entire ink component was 1.38. Moreover, the difference in refractive index between the porous body and the ink was 0.04.
Further, a transparent acrylic member (transmittance of 92%) was used as the protective member.
Using the porous body, ink, protective member, etc., a writing instrument conforming to FIGS. 1, 3, and 4 (pen nib) was prepared.

(Comparative Example 1)
The porous body was prepared by sintering using PE (refractive index 1.53). The thickness in the viewing direction was 200 μm, and the drawn line width was 5 mm.
The ink composition used was the composition used in Example 2 above. The difference in refractive index between the porous body and the ink was 0.04.
A writing instrument based on FIGS. 1 to 3 was prepared using the porous material, ink, and the like.

Using each of the obtained writing implements, the transparency and the strokes were evaluated by the following evaluation methods.
These evaluation results are written and shown in Table 1.
(Method for evaluating the transparency of the porous body that becomes the visual recognition part)
Sensory evaluation was performed to determine whether or not letters in the writing direction could be visually recognized through the porous body. Further, the transparency in this case was evaluated by the following evaluation criteria by measuring the transmittance of visible light.
The transparency of the visual recognition part was measured with a visibility transmittance meter / STS-4 (manufactured by Fuji Photoelectric Co., Ltd.).
Evaluation criteria:
A: Visibility is very good. Characters on the other side of the visual recognition part can be clearly seen and read. Transmittance 80% to 100%
○: Good visibility. Can read characters on the other side of the visual recognition part, but worse than ◎. Transmittance of 60% or more and less than 80% ○ ': Level that can be visually recognized. Transmittance 50% or more and less than 60% Δ: Visible, but difficult to read. Transmittance 40% or more and less than 50% ×: Not visible. Transmittance less than 40%.

Using each writing instrument, the outflow of ink from the nib (pen part) and the degree of fading were evaluated according to the following evaluation criteria.
Evaluation criteria:
A: No fading. Ink has flowed out sufficiently.
○: No fading.
○ ′: Some faintness has occurred.
Δ: Faint Insufficient flow rate.
X: The ink flow is remarkably insufficient and the ink flow rate is insufficient.

As is clear from the results of Table 1 above, Examples 1 and 2 that are within the scope of the present invention are compared with Comparative Example 1 that is outside the scope of the present invention, and when ink is supplied to the porous body that becomes the pen tip, It was found that the porous body immediately had a visual recognition part (transparency), and even if written, the ink flowed out satisfactorily without fading and good writing was possible.
In contrast, in Comparative Example 1, although the porous body became slightly translucent when ink was supplied, it was not so transparent that the other side of the viewing portion could be confirmed. It was the same as a general-purpose markin pen.

(Test example)
Transparency is confirmed by the above evaluation method using the same writing instrument and ink as in Example 1 using five types of pen nibs with the thickness of the visual recognition part of FIG. 2 being 30 μm, 50 μm, 400 μm, 2 mm, and 4 mm. Then, the blur of the drawn line was evaluated.
These results are shown in Table 2 below.

  As is clear from the results in Table 2 above, when the thickness of the visual recognition part is in the range of 50 μm to 2 mm, when the ink is supplied to the porous body serving as the pen tip, the porous body immediately exhibits a good visual recognition part (transparency). It was found that even if written, the outflow of ink was good and there was no fading and good writing was possible.

  A writing instrument suitable for a marking pen that can easily recognize the opposite side of the pen body as the pen tip, easily recognize the end point position of drawing, and easily recognize the end time of ink is obtained.

A Writing instrument 10 Shaft cylinder (pen body)
20 Ink occlusion body 30 Nib 31 Pen part (writing part)

Claims (6)

  In a writing instrument that enables writing by supplying ink in the pen body to the pen tip, the pen tip is made of a porous body, and the refractive index difference between the porous material constituting the porous body and the ink is 0.1. A writing instrument, wherein the following ink is supplied to a porous body serving as a nib, whereby the porous body becomes a visual recognition part.   The writing instrument according to claim 1, wherein the refractive index of the porous material is in the range of 1.34 to 1.60.   The writing instrument according to claim 1 or 2, wherein the refractive index of the ink is in the range of 1.33 to 1.50.   The writing instrument according to any one of claims 1 to 3, wherein a thickness of the porous body serving as the visual recognition portion in a visual recognition direction is 50 µm to 2 mm.   The writing instrument according to any one of claims 1 to 4, wherein the visible portion to which ink is supplied transmits visible light of 40% or more.   The writing instrument according to any one of claims 1 to 5, wherein the visual recognition part becomes opaque when the ink is used up.

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