JP3162814U - Thermochromic writing instrument - Google Patents

Abstract

An object of the present invention is to enable thermal discoloration of a thermochromic ink by friction immediately after writing in any case where the cap is in a reverse or separated state, and is suitable for a desired thermochromic area. A thermochromic writing instrument capable of using a friction part having a shape is provided. A thermochromic writing instrument (1) includes a shaft cylinder (2) containing a thermochromic ink therein and a pen tip (21) capable of discharging the thermochromic ink at a front end, and the nib of the shaft cylinder (2). The cap 3 is attachable to the 21 side. A first friction portion 5 is provided at the rear end of the shaft cylinder 2. A second friction portion 6 is provided on the top of the cap 3. Either the first friction part 5 or the second friction part 6 rubs the handwriting of the thermochromic ink, and the handwriting of the thermochromic ink can be discolored by frictional heat generated at that time. [Selection] Figure 1

Description

The present invention relates to a thermochromic writing instrument. In detail, it is related with the thermochromic writing instrument which incorporated the thermochromic ink.

Conventionally, in a thermochromic writing instrument incorporating a thermochromic ink, Patent Document 1 discloses a configuration in which a friction body for thermally discoloring a handwriting by a thermochromic ink by frictional heat is provided on the top of the cap. The structure provided at the rear end of the (shaft tube of the present invention) is described.

JP 2004-148744 A

The conventional thermochromic writing instrument has a configuration in which a friction body is provided only at the rear end of the shaft cylinder, and the friction body cannot be used in a state where the cap is attached to the rear end of the shaft cylinder, and is inconvenient. In the case of a configuration in which a friction body is provided only on the top of the cap, when using the friction body with the cap separated from the shaft cylinder, it takes time to move the shaft cylinder to the cap after writing, and it is immediately possible to perform thermochromic work. Cannot migrate.

Further, conventionally, this type of thermochromic writing instrument may want to thermally discolor a small area of the handwriting of the thermochromic ink, or may want to discolor a large area of the handwriting of the thermochromic ink. Since the conventional thermochromic writing instrument has only one type of friction body, there is a possibility that a friction body having an outer shape suitable for a desired thermochromic area cannot be used.

The present invention solves the above-mentioned conventional problems, and immediately changes the handwriting of thermochromic ink by friction after writing in any case such as when the cap is in a reverse or separated state. In addition, an object of the present invention is to provide a thermochromic writing instrument capable of using a friction portion having an outer shape suitable for a desired thermochromic area. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side. In the present invention, the top of the cap refers to the closed side of the cap.

The first device of the present application includes a shaft cylinder 2 that contains a thermochromic ink inside and a pen tip 21 that can discharge the thermochromic ink at the front end, and a pen tip 21 side of the shaft cylinder 2. A thermochromic writing instrument comprising an attachable cap 3, wherein a first friction portion 5 is provided at a rear end of the shaft tube 2, a second friction portion 6 is provided at a top portion of the cap 3, and the first 1 rubs the handwriting of the thermochromic ink by the frictional part 5 and the handwriting of the thermochromic ink can be thermally discolored by frictional heat generated at that time, and the second frictional part 6 The handwriting of the thermochromic ink can be thermally discolored by frictional heat generated by rubbing the handwriting of the thermochromic ink (claim 1).

The thermochromic writing instrument 1 of the first device can thermally change the handwriting of the thermochromic ink by friction, regardless of which of the first friction part 5 and the second friction part 6 is used. Therefore, in a state where the cap 3 is attached to the rear end portion of the shaft tube 2, the second friction portion 6 at the top of the cap 3 can be used, and the cap 3 is separated from the shaft tube 2 or the cap 3 is connected to the shaft tube 2. In the state of being mounted on the pen tip 21 side, the first friction portion 5 at the rear end portion of the shaft tube 2 can be used. As a result, the thermochromic writing instrument 1 of the first invention causes the handwriting of the thermochromic ink to be thermally discolored by friction immediately after use, regardless of the state of the cap 3 relative to the shaft tube 2. be able to.

The second device of the present application requires that the outer shape of the first friction portion 5 and the outer shape of the second friction portion 6 are different from those of the first device (Claim 2).

In the thermochromic writing instrument 1 of the second device, the outer shape of the first friction part 5 and the outer shape of the second friction part 6 are different (that is, the writing surface when pressed with a constant load). When the handwriting of a small area thermochromic ink is thermally discolored due to the difference in contact area between the first friction part 5 and the second friction part 6, the contact area with the writing surface at a constant load A small friction part (for example, a friction part having an outer shape with a small outer diameter) can be selected and used. On the other hand, when the handwriting of a large area thermochromic ink is thermally discolored, A friction portion having a large contact area (for example, a friction portion having an outer shape and a large outer diameter) can be selected and used. Thereby, the thermochromic writing instrument 1 of the said 2nd invention can use the friction part which has an outer shape suitable for the desired thermochromic area.

According to a third device of the present application, in the second device, the first friction portion 5 includes a convex-curved top portion 5a, and the second friction portion 6 includes a convex-curved top portion 6a. It is a requirement that the curvature radius r1 of the convex-curved top portion 5a of the first friction portion 5 is different from the curvature radius r2 of the convex-curved top portion 6a of the second friction portion 6 (Claim 3). To do.

The thermochromic writing instrument 1 of the third invention has a small radius of curvature in the first friction part 5 or the second friction part 6 when the handwriting of the thermochromic ink having a small area is thermally discolored. When using a friction part having a convex-curved top (ie, a friction part having a small contact area with the writing surface at a constant load) and thermally changing the handwriting of a large-area thermochromic ink, the radius of curvature is A friction part having a large convex curved top (ie, a friction part having a large contact area with the writing surface under a constant load) can be used. Thereby, the thermochromic writing instrument 1 of the third device can use a friction part having an outer shape suitable for a desired thermochromic area. Furthermore, in the thermochromic writing instrument 1 of the third device, since both the first friction part 5 and the second friction part 6 have a convex curved top part, the friction part is provided with respect to the writing surface. Even if they are brought into contact with each other, an appropriate contact area can be easily obtained by either the first friction part 5 or the second friction part 6.

A fourth device of the present application is the first, second, or third device, wherein the first friction portion 5 or the second friction portion 6 includes a small-diameter portion 61a having a convex-curved top portion 6a; It is a requirement that it comprises a large-diameter portion 61b integrally connected to the rear end of the small-diameter portion 61a.

In the thermochromic writing instrument 1 of the fourth device, the first friction portion 5 or the second friction portion 6 is integrated with a small diameter portion 61a having a convex curved top 6a and a rear end of the small diameter portion 61a. The convex portion 6a having a small curvature radius can be easily formed, and the friction portion including the small diameter portion 61a is formed on the shaft cylinder 2. Attachment or attachment to the cap 3 is facilitated.

The fifth device of the present application requires that, in the fourth device, a constricted portion 61c is formed at a connection portion between the small diameter portion 61a and the large diameter portion 61b (Claim 5).

In the thermochromic writing instrument 1 of the fifth device, the constricted portion 61c is formed at the connecting portion (continuous portion) between the small diameter portion 61a and the large diameter portion 61b, so that the small diameter portion 61a is formed with respect to the writing surface. Even if it contacts diagonally, the top part 6a of the small diameter part 61a and a writing surface can be made to contact appropriately. In the configuration in which the constricted portion 61c is not provided, there is a possibility that proper contact between the top portion 6a of the small diameter portion 61a and the writing surface cannot be obtained.

The sixth device of the present application is the same as that of the third, fourth or fifth device, wherein the radius of curvature r2 of the convex-curved top portion 6a of the second friction portion 6 is set to the convex curved surface shape of the first friction portion 5. It is a requirement that the radius of curvature r1 of the top 5a is set to be smaller than the curvature radius r1.

In the thermochromic writing instrument 1 of the sixth device, the curvature radius r2 of the convex-curved top portion 6a of the second friction portion 6 is larger than the curvature radius r1 of the convex-curved top portion 5a of the first friction portion. By setting it small, the diameter-reduced design of the top of the cap 3 can be easily obtained. In particular, in the case of the pen point 21 having a relatively sharp shape such as a ballpoint pen or a sign pen, the type of the pen point is easily identified by the outer shape having a relatively small radius of curvature at the top of the cap 3.

The sixth device of the present application is the same as that of the third, fourth or fifth device, wherein the radius of curvature r2 of the convex-curved top portion 6a of the second friction portion 6 is set to the convex curved surface shape of the first friction portion 5. It is a requirement that it is set to be larger than the radius of curvature r1 of the top 5a.

In the thermochromic writing instrument 1 of the sixth device, the curvature radius r2 of the convex-curved top portion 6a of the second friction portion 6 is larger than the curvature radius r1 of the convex-curved top portion 5a of the first friction portion. By setting it large, a design in which the diameter of the top of the cap 3 is increased can be easily obtained. In particular, in the case of a relatively thick pen tip 21 such as a marking pen, the pen tip type is easily identified by the outer shape having a relatively large radius of curvature at the top of the cap 3.

-Friction part In the present invention, the first friction part 5 and the second friction part 6 are preferably made of a soft material. Examples of the soft material constituting the first friction part 5 and the second friction part 6 include an elastic resin (rubber, elastomer). For example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer weight) Coalesce), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The soft material constituting the first friction part 5 and the second friction part 6 is less wearable than the one made of a highly wearable elastic material (for example, an eraser), so that no debris is generated during friction. It is preferably made of an elastic material. The means for attaching the first friction part 5 to the rear end of the shaft cylinder 2 and the means for attaching the second friction part 6 to the top of the cap 3 are, for example, press-fit, fitting, engaging, screwing, Means such as adhesion or integral molding by two-color molding can be used.

In the present invention, the pen tip 21 has, for example, a ball-point pen chip, a fiber bundle resin processed body, a fiber bundle heat-bonded processed body, a felt processed body, a pipe-shaped pen body, and a slit at the tip. Examples thereof include a fountain pen type plate pen body, a brush pen body, a porous foam body of a synthetic resin, and an extruded body of a synthetic resin having an axial ink guide path.

In addition, in the present invention, the shaft tube 2 includes a pen tip holding member that holds the pen tip 21 and a tail plug attached to the rear end opening of the shaft tube 2. Examples of the configuration in which the thermochromic ink is accommodated in the shaft cylinder 2 include a direct liquid type in which the thermochromic ink is directly accommodated in the inside, or a batting type in which the ink occlusion body is impregnated with the thermochromic ink.

-Thermochromic ink In the present invention, the thermochromic ink is preferably a reversible thermochromic ink. The reversible thermochromic ink is a heat decoloring type that decolors by heating from a colored state, a color memory retaining type that reversibly stores and retains a colored state or a decolored state in a specific temperature range, or from a decolored state Various types such as a heating coloring type that develops color by heating and returns to a decolored state by cooling from the colored state can be used alone or in combination.

The coloring material contained in the reversible thermochromic ink includes conventionally known (a) electron donating color-forming organic compounds, (b) electron-accepting compounds, and (c) color reactions of both. A reversible thermochromic microcapsule pigment in which a reversible thermochromic composition containing at least three essential components of a reaction medium for determining the occurrence temperature of the microcapsule is preferably used.

In the present invention, as shown in FIG. 11, the shape of the curve plotting the change in color density due to the temperature change is opposite to the case where the temperature is raised from the lower temperature side than the color change temperature range, and from the higher temperature side than the color change temperature range. The color changes by following a different path depending on the descending state, and the color development state in the low temperature range below the complete color development temperature (t ₁ ) or the color erase state in the high temperature range above the complete color erase temperature (t ₄ ) It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)]. In FIG. 11, ΔH indicates a temperature width (ie, hysteresis width) indicating the degree of hysteresis. When the value of ΔH is small, only one of the two states before and after the color change can exist. When the value of ΔH is large, it is easy to maintain each state before and after the color change.

In the present invention, the color change temperature due to frictional heat of the friction portion of the thermochromic ink is set to 25 ° C. to 95 ° C. (preferably 36 ° C. to 95 ° C.). That is, in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), It is effective to set the complete color development temperature (t ₁ )] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Thereby, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction part.

The reversible thermochromic microcapsule pigment preferably has an average particle diameter in the range of 0.5 to 5.0 μm, preferably 1 to 4 μm. When the average particle diameter exceeds 5.0 μm, the outflow from the capillary gap of the ballpoint pen tip or the porous pen body decreases, and when the average particle diameter is 0.5 μm or less, it is difficult to show high density color development. .

The reversible thermochromic microcapsule pigment can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

The thermochromic writing instrument of the present invention can thermally change the handwriting of the thermochromic ink by friction immediately after writing, regardless of whether the cap is in the back-inserted state or the separated state.

<First Embodiment>
An embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2 and a cap 3 that can be mounted on the pen tip 21 side of the shaft tube 2.

A pen tip 21 made of a ballpoint pen tip is provided at the front end of the shaft tube shaft 2, and thermochromic ink is accommodated in the shaft tube 2, and the thermochromic ink is received from the pen tip 21 during writing. It is discharged outside. Specifically, a cursive body made of a ballpoint pen refill is accommodated in the shaft cylinder 2 in a replaceable manner. A thermochromic ink is accommodated in the cursive body, and a ballpoint pen tip (pen nib 21) is attached to the front end of the cursive body.

A first friction portion 5 made of a molded body of a low-wearing elastic material (for example, SBS resin, SEBS resin) that does not generate debris at the time of friction is provided at the rear end portion of the first friction portion shaft cylinder 2. Provided. The first friction portion 5 is attached to the attachment hole 22 at the rear end portion of the shaft tube 2 by fitting.

The first friction portion 5 is integrally connected to a cylindrical insertion portion 52 to be inserted into the mounting hole 22 and a rear end of the insertion portion 52, and protrudes to the outside from the rear end of the shaft tube 2. It consists of a protrusion 51. The top portion 5a (the rear end portion of the protruding portion 51) of the first friction portion 5 is formed in a convex curved surface shape.

- thermochromic ink the thermochromic ink is, the low-temperature side color change point (complete coloring temperature t ₁₎ is set to any temperature in the range of -30 ℃ ~-10 ℃, the high temperature side color change point (complete decoloring temperature A reversible thermochromic ink in which t ₄ ) is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and the hysteresis width ΔH is in the range of 40 ° C. to 60 ° C. is employed.

A pen point seal member 32 made of an elastic material is accommodated in the cap cap 3. When the cap 3 is mounted on the pen tip 21 side of the shaft tube 2, the pen tip 21 (the tip of the ballpoint pen tip) is sealed by the pen tip seal member 32. A clip 34 is provided on the outer surface of the side wall of the cap 3.

The top of the cap 3 is provided with a second friction portion 6 made of a low-abrasion elastic material (for example, SBS resin or SEBS resin) that does not generate a debris during friction. The second friction part 6 is attached to the attachment hole 31 at the top of the cap 3 by fitting.

The second friction part 6 is integrally connected to a cylindrical insertion part 62 that is inserted into the mounting hole 31 and a front end of the insertion part 62, and protrudes outward from the top of the cap 3. It consists of. The protrusion 61 includes a small-diameter portion 61a having a convex-curved top portion 6a and a large-diameter portion 61b integrally connected to the rear end of the small-diameter portion 61a. An annular constriction 61c is formed at the connecting portion between the small diameter portion 61a and the large diameter portion 61b. Even when the second friction portion 6 is used obliquely with respect to the writing surface, the constricted portion 61c can provide proper contact between the top portion 6a of the second friction portion 6 and the writing surface.

The radius of curvature r2 of the convex curved top 6a of the second friction portion 6 (the radius of curvature r2 of the convex curved top 6a of the small diameter portion 61a) is the convex curved top 5a of the first friction portion 5. Is set smaller than the radius of curvature r1.

As shown in FIG. 1, when the cap 3 is mounted on the pen tip 21 side of the shaft tube 2, the first friction portion 5 and the second friction portion 6 at the rear end portion of the shaft tube 2 can be used. .

As shown in FIG. 4, when the cap 3 is separated from the shaft tube 2, the first friction portion 5 at the rear end of the shaft tube 2 can be used immediately after writing.

As shown in FIG. 5, when the cap 3 is mounted on the rear end portion of the shaft cylinder 2, the second friction portion 6 at the top of the cap 3 is used even if the first friction portion 5 is covered with the cap 3. can do.

<Second Embodiment>
An embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a shaft tube 2 and a cap 3 that can be mounted on the pen tip 21 side of the shaft tube 2.

A pen tip 21 made of a marking pen tip made of a porous material (fiber processed body or open cell body) is provided at the front end of the shaft tube 2, and thermochromic ink is accommodated in the shaft tube 2. When writing, the thermochromic ink is ejected from the nib 21 to the outside.

A first friction portion 5 made of a molded body of a low-wearing elastic material (for example, SBS resin, SEBS resin) that does not generate debris at the time of friction is provided at the rear end portion of the first friction portion shaft cylinder 2. Provided. The first friction portion 5 is attached to the attachment hole 22 at the rear end portion of the shaft tube 2 by fitting.

The first friction portion 5 is integrally connected to a cylindrical insertion portion 52 to be inserted into the mounting hole 22 and a rear end of the insertion portion 52, and protrudes to the outside from the rear end of the shaft tube 2. It consists of a protrusion 51. The top part 5a of the first friction part 5 (the top part of the protruding part 51) is formed in a convex curved surface shape.

- thermochromic ink the thermochromic ink is, the low-temperature side color change point (complete coloring temperature t ₁₎ is set to any temperature in the range of -30 ℃ ~-10 ℃, the high temperature side color change point (complete decoloring temperature A reversible thermochromic ink in which t ₄ ) is set to an arbitrary temperature in the range of 60 ° C. to 80 ° C. and the hysteresis width ΔH is in the range of 40 ° C. to 60 ° C. is employed.

・ Cap 3
Inside the cap 3, a sealing cylinder 33 made of a synthetic resin bottomed cylinder is accommodated. When the cap 3 is attached to the pen tip 21 side of the shaft tube 2, the pen tip 21 is sealed by the seal tube 33. A clip 34 is provided on the outer surface of the side wall of the cap 3.

The top of the cap 3 is provided with a second friction portion 6 made of a low-abrasion elastic material (for example, SBS resin or SEBS resin) that does not generate a debris during friction. The second friction part 6 is attached to the attachment hole 31 at the top of the cap 3 by fitting.

The second friction part 6 is integrally connected to a cylindrical insertion part 62 that is inserted into the mounting hole 31 and a front end of the insertion part 62, and protrudes outward from the top of the cap 3. It consists of. The top portion 6a of the second friction portion 6 (the top portion of the protruding portion 61) is formed in a convex curved shape.

The radius of curvature r2 of the convex curved top 6a of the second friction portion 6 (the radius of curvature r2 of the convex curved top 6a of the small diameter portion 61a) is the convex curved top 5a of the first friction portion 5. Is set larger than the radius of curvature r1.

As shown in FIG. 6, when the cap 3 is mounted on the pen tip 21 side of the shaft tube 2, the first friction portion 5 and the second friction portion 6 at the rear end portion of the shaft tube 2 can be used. .

As shown in FIG. 9, when the cap 3 is separated from the shaft tube 2, the first friction portion 5 at the rear end of the shaft tube 2 can be used immediately after writing.

As shown in FIG. 10, when the cap 3 is attached to the rear end portion of the shaft cylinder 2, the second friction portion 6 at the top of the cap 3 is used even if the first friction portion 5 is covered with the cap 3. can do.

In 1st Embodiment of this invention, it is a partially notched longitudinal cross-sectional view which shows the state which mounted | wore the pen point side of the axial cylinder with the cap. It is a principal part expanded longitudinal sectional view which shows the cap top part (2nd friction part) of FIG. FIG. 3 is an enlarged vertical cross-sectional view of a main part showing a rear end portion (first friction portion) of the shaft cylinder of FIG. 1. It is a front view which shows the state which isolate | separated the cap of FIG. 1 from the axial cylinder. It is a front view which shows the state which mounted | wore with the rear-end part of the axial cylinder of the cap of FIG. In the 2nd Embodiment of this invention, it is a partially notched longitudinal cross-sectional view which shows the state which mounted | wore the pen point side of the axial cylinder with the cap. FIG. 7 is an enlarged vertical cross-sectional view of a main part showing a cap top (second friction part) in FIG. 6. FIG. 7 is an enlarged vertical cross-sectional view of a main part showing a rear end portion (first friction portion) of the shaft cylinder of FIG. 6. It is a front view which shows the state which isolate | separated the cap of FIG. 6 from the axial cylinder. It is a front view which shows the state which mounted | wore the rear-end part of the axial cylinder with the cap of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 21 Pen tip 22 Attachment hole 3 Cap 31 Attachment hole 32 Pen tip seal member 33 Seal cylinder 34 Clip 5 First friction part 5a Convex-curved top part 51 Projection part 52 Insertion part 6 Second Friction portion 6a Convex-curved top portion 61 Projection portion 61a Small-diameter portion 61b Large-diameter portion 61c Constriction portion 62 Fit-in portion r1 Curvature radius r2 of convex-curved top portion of first friction portion Convex-curved shape of second friction portion Radius of curvature of the top of

Claims (7)

A thermochromic writing instrument comprising a shaft cylinder containing a thermochromic ink inside and a pen tip provided with a pen tip capable of discharging the thermochromic ink at the front end, and a cap attachable to the pen tip side of the shaft cylinder. A first friction part is provided at the rear end of the shaft cylinder, a second friction part is provided at the top of the cap, and the first friction part rubs the handwriting of the thermochromic ink. The handwriting of the thermochromic ink can be thermally discolored by frictional heat generated at the time, and the thermal discoloration is generated by frictional heat generated by rubbing the handwriting of the thermochromic ink by the second friction part. A thermochromic writing instrument characterized in that the handwriting of the photochromic ink can be thermochromic. 2. The thermochromic writing instrument according to claim 1, wherein an outer shape of the first friction portion is different from an outer shape of the second friction portion. The first friction part has a convex curved top, the second friction part has a convex curved top, the curvature radius of the convex curved top of the first friction part, The thermochromic writing instrument according to claim 2, wherein the curvature radius of the top of the convex curved surface of the friction part 2 is different. The said 1st friction part or the 2nd friction part consists of a small diameter part provided with the convex-curved top part, and a large diameter part integrally connected with the rear end of this small diameter part, 3. The thermochromic writing instrument according to 3. The thermochromic writing instrument according to claim 4, wherein a constricted portion is formed at a connecting portion between the small diameter portion and the large diameter portion. The thermochromic writing instrument according to claim 3, 4 or 5, wherein the radius of curvature of the top of the convex surface of the second friction portion is set smaller than the radius of curvature of the top of the convex surface of the first friction portion. The thermochromic writing instrument according to claim 3, 4 or 5, wherein the radius of curvature of the top of the convex surface of the second friction part is set larger than the radius of curvature of the top of the convex surface of the first friction part.

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