JP2014100919A - Friction body and thermochromic writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermochromic writing instrument which prevents optical deterioration of a thermochromic ink and which suppresses permeation of moisture of the water-based thermochromic ink through the writing instrument and a shaft tube due to storage for a long period.SOLUTION: A refill 7 is housed in a shaft tube 2 in an exchangeable manner, the refill 7 storing water-based thermochromic ink 75 and having a pen nib 71 at a front end thereof through which the thermochromic ink 75 can be discharged. The pen nib 71 is made to protrude from a front end of the shaft tube 2. The shaft tube 2 comprises: a front shaft 3 having a front end hole 34 from which the pin nib 71 is protruded; and a rear shaft 4 which is freely attachably/detachably screwed on the front shaft 3. At least the rear shaft 4 is made of material having a light-shielding property and a gas nonpermeation property. To the pen nib 71 side of the shaft tube 2, a freely attachably/detachable cap 5 is attached. The cap 5 is made of the material having the light-shielding property and the gas nonpermeation property. When the cap 5 is attached to the front shaft 3, the pen nib 71 is hermetically sealed and, simultaneously, the refill 7 is concealed so as not to be visibly recognized from the outside.

Description

  The present invention relates to a thermochromic writing instrument and a refill for a thermochromic writing instrument.

  2. Description of the Related Art Conventionally, in thermochromic writing instruments, for example, Patent Document 1 and Patent Document 2 include a configuration in which a ballpoint refill filled with aqueous thermochromic ink is housed in a shaft cylinder, and handwriting with thermochromic ink. A configuration is disclosed in which a friction body capable of thermally discoloring the handwriting with frictional heat generated at the time of friction is provided at the rear end of the shaft cylinder or the top of the cap.

JP 2006-123324 A JP 2007-223302 A

  In the conventional thermochromic writing instrument, when the refill and the shaft tube are formed of a transparent material so that the remaining amount of ink can be confirmed, when exposed to light such as sunlight, the thermochromic ink is photodegraded and heated. There is a possibility that the density of the handwriting of the color-changing ink is lowered.

  In the conventional thermochromic writing instrument, the water-based thermochromic ink is obtained by dispersing a thermochromic pigment (thermochromic microcapsule pigment) in an aqueous medium. In the case of a general synthetic resin such as polycarbonate or polycarbonate, moisture in the ink is vaporized by long-term storage in a high-temperature environment, which easily passes through the side wall of the refill and the side wall of the shaft tube. As a result, the viscosity of the thermochromic ink increases, and there is a possibility that ink outflow from the pen tip may be reduced or writing may become impossible.

  In addition, when the conventional thermochromic writing instrument rubs the handwriting of the thermochromic ink 75 using a friction body, it is necessary to apply a relatively large force to the writing surface as compared to the writing force. When a handwriting of a relatively large area is thermally discolored, there is a risk that the hand feels tired.

  The present invention solves the above-mentioned conventional problems, can avoid photodegradation of thermochromic ink, and allows moisture of water-based thermochromic ink to permeate the cursive body and the barrel after long-term storage. It is an object of the present invention to provide a thermochromic writing instrument that can suppress the fatigue, and can reduce the feeling of fatigue given to the hand when the handwriting of a relatively large area is thermally discolored. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side. In the present invention, the “top portion of the cap” refers to the closed end side of the cap (that is, the side opposite to the cap opening end).

[1] In the first invention of the present application, the refill 7 having a nib 71 in which water-based thermochromic ink 75 is accommodated and which can discharge the thermochromic ink 75 at the front end is disposed in the shaft cylinder 2. It is a thermochromic writing instrument which is accommodated in a replaceable manner and has a nib 71 protruding from the front end of the shaft tube 2, and the shaft tube 2 is made of a light-shielding and gas-impermeable material.

  In the thermochromic writing instrument 1 of the first invention, since the shaft tube 2 is made of a light-shielding and gas-impermeable material, the thermochromic ink 75 is photodegraded even when exposed to light such as sunlight. In addition, the moisture of the thermochromic ink 75 can be prevented from passing through the shaft cylinder 2 during long-term storage in a high-temperature environment, and a reduction in handwriting density of the thermochromic ink 75 can be prevented.

  In the present invention, the shaft tube 2 is made of a light-shielding and gas-impermeable material. For example, the base material of the shaft tube 2 is made of a light-shielding and gas-impermeable material, or the shaft tube 2. In the case where the base material is made of a light-transmitting or gas-permeable material, a light-shielding and gas-impermeable material layer is formed on the outer surface or the inner surface of the base material of the shaft cylinder 2. . Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[2] According to a second invention of the present application, in the first invention, the shaft cylinder 2 includes a front shaft 3 provided with a front end hole 34 through which a pen tip 71 projects, and a screw detachably attached to the front shaft 3. And at least the rear shaft 4 is made of a light-shielding and gas-impermeable material, and a detachable cap 5 is provided on the pen tip 71 side of the shaft tube 2 so that the cap 5 is shielded from light. When the cap 5 is attached to the front shaft 3, the nib 71 is sealed and the refill 7 is concealed so as to be invisible from the outside.

  When the thermochromic writing instrument 1 of the second invention is not in use (during storage), the cap 5 is attached to the outer surface of the front shaft 3 to seal the pen tip 71 and make the refill 7 invisible from the outside. Concealed, thereby preventing photodegradation of the thermochromic ink 75 and sufficiently preventing moisture from the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 during long-term storage in a high temperature environment. it can. In the second invention, the front shaft 3 need not be made of a light-shielding and gas-impermeable material. If the front shaft 3 can be completely hidden by the cap 5, for example, the front shaft 3 is Alternatively, it may be made of a synthetic resin such as polypropylene having translucency and gas permeability.

  In the present invention, the cap 5 is made of a light-shielding and gas-impermeable material, for example, the structure in which the base material of the cap 52 is made of a light-shielding and gas-impermeable material, or the base material of the cap 5 In the case where is made of a light-transmitting or gas-permeable material, a structure in which a layer made of a light-shielding and gas-impermeable material is formed on the outer surface or the inner surface of the base material of the cap 5 can be mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[3] A third invention of the present application is the friction body according to the second invention, wherein the handwriting of the thermochromic ink 75 is rubbed and the handwriting of the thermochromic ink 75 is thermally discolored by frictional heat generated at that time. 6 is provided at the rear end of the rear shaft 4 as a requirement.

  In the thermochromic writing instrument 1 of the third invention, the friction body 6 is provided at the rear end of the rear shaft 4, so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is removed from the shaft cylinder 2. In the state, the friction body 6 can be used to rub the handwriting of the thermochromic ink 75. Moreover, the thermochromic writing instrument 1 of the third invention can obtain a high weight of the entire writing instrument as compared with a light-transmitting and gas-permeable material. When rubbing the handwriting of the discolorable ink 75, the force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

[4] The fourth invention of the present application is the friction body according to the second invention, wherein the handwriting of the thermochromic ink 75 is rubbed by the frictional heat generated by rubbing the handwriting of the thermochromic ink 75. 6 is provided on the top of the cap 5 as a requirement.

  In the thermochromic writing instrument 1 of the fourth invention, the friction body 6 is provided on the top of the cap 5 so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is attached to the rear end of the shaft tube 2. In the mounted state, it is possible to rub the handwriting of the thermochromic ink 75 using the friction body 6. Moreover, the thermochromic writing instrument 1 of the fourth invention can obtain a high weight of the entire writing instrument as compared with a light-transmitting and gas-permeable material. When rubbing the handwriting of the discolorable ink 75, the force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

[5] The fifth invention of the present application is that, in the third or fourth invention, the weight of the entire writing instrument is set in a range of 12 grams to 40 grams.

  The thermochromic writing instrument 1 of the fifth invention can reduce the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 because the weight of the entire writing instrument is in the range of 12 grams to 40 grams. It can alleviate the feeling of fatigue given to the hand and does not hinder the movement of the thermochromic writing instrument during writing. The weight of the entire writing instrument refers to the total weight when the cap 5 is attached to the shaft cylinder 2 (that is, the total weight of the cap 5, the shaft cylinder 2, the friction body 6, and the refill 7).

[6] In the sixth invention of the present application, a refill 7 having a nib 71 in which a water-based thermochromic ink 75 is accommodated and which can discharge the thermochromic ink 75 at the front end is provided in the shaft tube 2. A thermochromic writing instrument which is accommodated in a replaceable manner and has a nib 71 protruding from the front end of the shaft tube 2, and the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. And

  In the thermochromic writing instrument 1 according to the sixth aspect of the present invention, since the ink storage portion of the refill 7 is made of a light-shielding and gas-impermeable material, the thermochromic ink 75 can be used even when exposed to light such as sunlight. Can be prevented from being photodegraded, and the moisture of the thermochromic ink 75 can be prevented from permeating through the ink containing portion of the refill 7 during long-term storage in a high temperature environment. It is possible to prevent a decrease in concentration.

  In the present invention, the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. For example, the base material of the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. Alternatively, when the base material of the ink storage portion of the refill 7 is made of a light-transmitting or gas-permeable material, the outer surface or the inner surface of the base material of the ink storage portion is made of a light-shielding and gas-impermeable material. The structure etc. which form a layer are mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[7] The seventh invention of the present application is provided with a pen tip 71 in which a water-based thermochromic ink 75 is housed and which can discharge the thermochromic ink 75 at the front end, and the shaft cylinder 2 of the thermochromic writing instrument. It is a refill for a thermochromic writing instrument that is exchangeably accommodated therein, and it is a requirement that the ink accommodating portion of the refill 7 is made of a light-shielding and gas-impermeable material.

  The thermochromic writing refill 7 according to the seventh aspect of the present invention is such that the ink containing portion is made of a light-shielding and gas-impermeable material so that it can be exposed to light such as sunlight in the state of being accommodated in the shaft tube 2. Even if exposed, the thermochromic ink 75 can be prevented from photodegrading, and the moisture of the thermochromic ink 75 can be prevented from permeating through the ink containing portion of the refill 7 during long-term storage in a high temperature environment. In addition, it is possible to prevent a reduction in handwriting density of the thermochromic ink 75.

  In the present invention, the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. For example, the base material of the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. Alternatively, when the base material of the ink storage portion of the refill 7 is made of a light-transmitting or gas-permeable material, the outer surface or the inner surface of the base material of the ink storage portion is made of a light-shielding and gas-impermeable material. The structure etc. which form a layer are mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

-Thermochromic ink In the present invention, the thermochromic ink 75 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. 13, the shape of the curve plotting the change in the color density due to the temperature change is contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range, 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. 13, 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 part 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.), and the low temperature side discoloration point [ 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 body.

  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 less than 0.5 μm, it is difficult to show high color development. .

  The reversible thermochromic microcapsule pigment is dispersed in an aqueous medium and 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. be able to. 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.

Friction body Examples of the elastic material constituting the friction body 6 include elastic synthetic resins (rubber and elastomer), such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene). -Ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM) and the like.

  The present invention can avoid photodegradation of thermochromic ink even when exposed to light such as sunlight, and the moisture of thermochromic ink permeates through the shaft tube during long-term storage in a high temperature environment. Can be suppressed, and the reduction in the density of the handwriting of the thermochromic ink can be prevented.

It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

<First Embodiment>
A first embodiment of the thermochromic writing instrument of the present invention is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably mounted on the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided at the rear end of the shaft cylinder 2.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front port 31 whose base material is made of metal, a cylindrical front shaft main body 32 whose base material fixed to the rear end of the front port 31 is made of metal or synthetic resin, and the front shaft main body. The base material fixed to the rear end of 32 consists of the cylindrical connection cylinder 33 which consists of metals. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft 4 main body 41 whose base material is made of metal and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Friction body The friction body 6 made of an elastic material is fixed to the rear end of the support cylinder 42 fixed to the rear end of the rear shaft 4. Specifically, the friction body 6 made of an elastic material is fixed to the rear end opening of the support cylinder 42 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time. The friction body 6 and the support cylinder 42 may be provided detachably with respect to the rear shaft 4 (shaft cylinder 2).

Cap The cap 5 is composed of a cap body 51 whose base material is made of metal, an inner cap 52 made of a synthetic resin housed in the cap body 51, and a pen tip made of an elastic material housed in the inner cap 52 A seal member 53, a crown 54 connected to the top of the inner cap 52 and the top of the cap body 51, the base material made of metal, and a clip 55 provided on the outer surface of the cap body 51, the base material made of metal. Become.

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The refill 7 includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and a synthetic resin ink containing tube 73 to which the holder 72 is fixed to the front end portion. , And a synthetic resin tail plug 74 fixed to the rear end portion of the ink containing tube 73.

  The nib 71 is composed of a tip body (ballpoint tip) having a base made of metal and holding a ball rotatably at the front end. Inside the nib 71, the holder 72, and the ink containing tube 73 (that is, the ink containing portion), a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are arranged, and the thermochromic color is changed. The follower 76 made of a high-viscosity fluid that moves forward by the consumption of the reactive ink 75 is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is pressed against the support cylinder 42 at the rear end of the rear shaft 4 (that is, the front end of the support cylinder 42).

  A spring is received in the tip body. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 by long-term storage below.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided at the rear end of the rear shaft 4 so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is removed from the shaft cylinder 2. Thus, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. Further, the thermochromic writing instrument 1 of the present embodiment has a light-transmitting and gas-permeable material because the shaft tube 2 (at least the rear shaft main body 41) and the cap 5 (at least the cap main body 51) are made of a metal material. Compared to the above, it is possible to obtain a high weight of the entire writing instrument, thereby reducing the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 using the friction body 6 and giving the hand a feeling of fatigue. Can be relaxed.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

<Second Embodiment>
A second embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably attached to the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided on the top of the cap 5.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front end 31 made of metal as a base material, a metal or synthetic resin cylindrical front shaft main body 32 fixed to the rear end of the front end 31, and a rear of the front shaft main body 32. The base material fixed to the end is formed of a cylindrical connecting tube 33 made of metal. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft main body 41 whose base material is made of metal, and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Cap The cap 5 has a cap body 51 made of a metal base, an inner cap 52 made of a synthetic resin, one end of which is housed in the cap body 51 and the other end protruding outside from the top of the cap body 51, A pen tip seal member 53 made of an elastic material housed in the inner cap 52 and a clip 55 provided on the outer surface of the cap main body 51 and made of a metal base.

Friction body A friction body 6 made of an elastic material is fixed to the top of the inner cap 52. Specifically, the friction body 6 made of an elastic material is fixed to the opening at the top of the inner cap 52 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time.

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The refill 7 includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and a synthetic resin ink containing tube 73 to which the holder 72 is fixed to the front end portion. , And a synthetic resin tail plug 74 fixed to the rear end portion of the ink containing tube 73.

  The pen tip 71 is composed of a chip body (ballpoint pen tip) in which a base material having a ball rotatably held at a front end is made of metal. Inside the nib 71, the holder 72, and the ink containing tube 73 (that is, the ink containing portion), a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are arranged, and the thermochromic color is changed. The follower 76 made of a high-viscosity fluid that moves forward by the consumption of the reactive ink 75 is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is pressed against the support cylinder 42 at the rear end of the rear shaft 4 (that is, the front end of the support cylinder 42).

  A spring is accommodated in the tip body inside the nib 71. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 by long-term storage below.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided on the top of the cap 5, so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is mounted on the rear end of the shaft tube 2. In this state, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. Further, the thermochromic writing instrument 1 of the present embodiment has a light-transmitting and gas-permeable material because the shaft tube 2 (at least the rear shaft main body 41) and the cap 5 (at least the cap main body 51) are made of a metal material. Compared to the above, it is possible to obtain a high weight of the entire writing instrument, thereby reducing the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 using the friction body 6 and giving the hand a feeling of fatigue. Can be relaxed.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

<Third Embodiment>
A third embodiment of the thermochromic writing instrument 1 of the present invention (embodiment of the refill 7 for thermochromic writing instrument of the present invention) is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably mounted on the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided at the rear end of the shaft cylinder 2.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front port 31 whose base material is made of metal, a cylindrical front shaft main body 32 whose base material fixed to the rear end of the front port 31 is made of metal or synthetic resin, and the front shaft main body. The base material fixed to the rear end of 32 consists of the cylindrical connection cylinder 33 which consists of metals. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft main body 41 whose base material is made of metal, and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Friction body The friction body 6 made of an elastic material is fixed to the rear end of the support cylinder 42 fixed to the rear end of the rear shaft 4. Specifically, the friction body 6 made of an elastic material is fixed to the rear end opening of the support cylinder 42 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time. The friction body 6 and the support cylinder 42 may be provided detachably with respect to the rear shaft 4 (shaft cylinder 2).

Cap The cap 5 is composed of a cap body 51 whose base material is made of metal, an inner cap 52 made of a synthetic resin housed in the cap body 51, and a pen tip made of an elastic material housed in the inner cap 52 The seal member 53, a crown 54 made of metal for the base material connected to the top of the inner cap 52 and the top of the cap body 51, and a clip 55 made of metal for the base material provided on the outer surface of the cap body 51. .

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The thermochromic writing instrument refill 7 of the present embodiment includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and the holder 72 fixed to the front end portion. The base material includes an ink containing tube 73 made of metal and a synthetic resin tail plug 74 fixed to the rear end of the ink containing tube 73.

  The pen tip 71 is composed of a chip body (ballpoint pen tip) in which a base material having a ball rotatably held at a front end is made of metal. Inside the nib 71, the holder 72, and the ink storage tube 73, a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are disposed. A follower 76 made of a high-viscosity fluid that moves forward is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is in pressure contact with the support cylinder 42 at the rear end of the rear shaft 4 (the front end of the support cylinder 42).

  A spring is received in the tip body. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Furthermore, in the thermochromic writing instrument 1 of the present embodiment, the ink containing portion (that is, at least the ink containing tube 73) of the refill 7 is formed of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from permeating through the ink container, the shaft cylinder 2 and the cap 5 by long-term storage.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided at the rear end of the rear shaft 4 so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is removed from the shaft cylinder 2. Thus, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. In addition, the thermochromic writing instrument 1 of the present embodiment has a shaft cylinder 2 (at least the rear shaft main body 41), a cap 5 (at least the cap main body 51), and an ink storage portion (at least the ink storage tube 73) of the refill 7 as a metal material. Therefore, compared to a material having translucency and gas permeability, it is possible to obtain a high weight of the entire writing instrument, and thus when rubbing the handwriting of the thermochromic ink 75 using the friction body 6, The force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

  The thermochromic writing instrument refill 7 according to the present embodiment is configured such that the ink storage portion (at least the ink storage tube 73) of the refill 7 is made of a metal material, so that the refill 7 can receive sunlight, etc. Even when exposed to light, the thermochromic ink 75 can be prevented from photodegrading, and the moisture of the thermochromic ink 75 can permeate through the ink container of the refill 7 during long-term storage in a high temperature environment. Can be suppressed, and a reduction in handwriting density of the thermochromic ink 75 can be prevented.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 3 Front shaft 31 Front port 32 Front shaft main body 33 Connection cylinder 34 Front end hole 4 Rear shaft 41 Rear shaft main body 42 Support cylinder 5 Cap 51 Cap main body 52 Inner cap 53 Nib seal member 54 Head crown 55 Clip 6 Friction body 7 Refill 71 Nib 72 Holder 73 Ink receiving tube 74 Tail plug 74a Vent hole 74b Elastic leg piece 75 Thermochromic ink 76 Follower

The present invention relates to a friction body and a thermochromic writing instrument .

  2. Description of the Related Art Conventionally, in thermochromic writing instruments, for example, Patent Document 1 and Patent Document 2 include a configuration in which a ballpoint refill filled with aqueous thermochromic ink is housed in a shaft cylinder, and handwriting with thermochromic ink. A configuration is disclosed in which a friction body capable of thermally discoloring the handwriting with frictional heat generated at the time of friction is provided at the rear end of the shaft cylinder or the top of the cap.

JP 2006-123324 A JP 2007-223302 A

  In the conventional thermochromic writing instrument, when the refill and the shaft tube are formed of a transparent material so that the remaining amount of ink can be confirmed, when exposed to light such as sunlight, the thermochromic ink is photodegraded and heated. There is a possibility that the density of the handwriting of the color-changing ink is lowered.

  In the conventional thermochromic writing instrument, the water-based thermochromic ink is obtained by dispersing a thermochromic pigment (thermochromic microcapsule pigment) in an aqueous medium. In the case of a general synthetic resin such as polycarbonate or polycarbonate, moisture in the ink is vaporized by long-term storage in a high-temperature environment, which easily passes through the side wall of the refill and the side wall of the shaft tube. As a result, the viscosity of the thermochromic ink increases, and there is a possibility that ink outflow from the pen tip may be reduced or writing may become impossible.

  In addition, when the conventional thermochromic writing instrument rubs the handwriting of the thermochromic ink 75 using a friction body, it is necessary to apply a relatively large force to the writing surface as compared to the writing force. When a handwriting of a relatively large area is thermally discolored, there is a risk that the hand feels tired.

  The present invention solves the above-mentioned conventional problems, can avoid photodegradation of thermochromic ink, and allows moisture of water-based thermochromic ink to permeate the cursive body and the barrel after long-term storage. It is an object of the present invention to provide a thermochromic writing instrument that can suppress the fatigue, and can reduce the feeling of fatigue given to the hand when the handwriting of a relatively large area is thermally discolored. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side. In the present invention, the “top portion of the cap” refers to the closed end side of the cap (that is, the side opposite to the cap opening end).

A first invention of the present application is a friction body capable of thermally changing the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink and the heat of friction generated at that time, and the shaft of the thermochromic writing instrument. The friction body is required to be fixed to a support cylinder that is detachable from the rear end.

2nd invention of this application is a friction body which requires that the said support cylinder in said 1st invention consists of a metal or a synthetic resin.

The third invention of the present application is a thermochromic writing instrument which requires that the friction body in the first or second invention is provided detachably on the rear end portion of the shaft cylinder via the support cylinder. is there.

[1] As an embodiment of the invention of the present application, a refill 7 in which a water-based thermochromic ink 75 is housed and a nib 71 capable of discharging the thermochromic ink 75 at the front end is provided in the shaft tube 2. replaceably accommodated, a thermochromic writing instrument comprising by projecting nib 71 from the front end of the barrel 2 may be configured to the barrel 2 is made of a light-shielding property and gas-impermeable material.

Since the shaft tube 2 is made of a light-shielding and gas-impermeable material, the thermochromic ink 75 can be prevented from light deterioration even when exposed to light such as sunlight, and in a high temperature environment. It is possible to prevent moisture in the thermochromic ink 75 from passing through the shaft cylinder 2 during long-term storage, and to prevent a reduction in handwriting density of the thermochromic ink 75.

  In the present invention, the shaft tube 2 is made of a light-shielding and gas-impermeable material. For example, the base material of the shaft tube 2 is made of a light-shielding and gas-impermeable material, or the shaft tube 2. In the case where the base material is made of a light-transmitting or gas-permeable material, a light-shielding and gas-impermeable material layer is formed on the outer surface or the inner surface of the base material of the shaft cylinder 2. . Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[2] As an embodiment of the invention of the present application , the shaft cylinder 2 includes a front shaft 3 provided with a front end hole 34 from which a pen tip 71 protrudes, and a rear shaft 4 detachably screwed to the front shaft 3. And at least the rear shaft 4 is made of a light-shielding and gas-impermeable material, and a detachable cap 5 is provided on the pen tip 71 side of the shaft tube 2 so that the cap 5 is light-shielding and gas-impermeable. It is good also as a structure which consists of material and when the said cap 5 is mounted | worn with the front axis | shaft 3, the nib 71 is sealed and the refill 7 is concealed invisible from the outside.

When not in use (during storage) , the cap 5 is attached to the outer surface of the front shaft 3 so that the pen tip 71 is sealed and the refill 7 is concealed from the outside so as to be invisible from the outside. In addition to preventing deterioration, it is possible to sufficiently prevent moisture of the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 during long-term storage in a high temperature environment. In the second invention, the front shaft 3 need not be made of a light-shielding and gas-impermeable material. If the front shaft 3 can be completely hidden by the cap 5, for example, the front shaft 3 is Alternatively, it may be made of a synthetic resin such as polypropylene having translucency and gas permeability.

  In the present invention, the cap 5 is made of a light-shielding and gas-impermeable material, for example, the structure in which the base material of the cap 52 is made of a light-shielding and gas-impermeable material, or the base material of the cap 5 In the case where is made of a light-transmitting or gas-permeable material, a structure in which a layer made of a light-shielding and gas-impermeable material is formed on the outer surface or the inner surface of the base material of the cap 5 can be mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[3] As an embodiment of the invention of the present application, the friction body 6 capable of thermally discoloring the handwriting of the thermochromic ink 75 by frictional heat generated by rubbing the handwriting of the thermochromic ink 75, and the rear shaft 4 It is good also as a structure provided in the rear-end part.

By providing the friction body 6 at the rear end of the rear shaft 4, the discoloration is performed using the friction body 6 in a state where the cap 5 is mounted on the pen tip 71 side and a state where the cap 5 is removed from the shaft cylinder 2. The handwriting of the ink 75 can be rubbed. Moreover, the thermochromic writing instrument 1 of the third invention can obtain a high weight of the entire writing instrument as compared with a light-transmitting and gas-permeable material. When rubbing the handwriting of the discolorable ink 75, the force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

[4] As an embodiment of the invention of the present application, the friction body 6 capable of thermally changing the handwriting of the thermochromic ink 75 by frictional heat generated by rubbing the handwriting of the thermochromic ink 75, It is good also as a structure provided in the top part.

By the friction member 6 provided at the top of the cap 5, the state and the cap 5 fitted with a cap 5 to the pen tip 71 side in a state of being mounted on the rear end of the barrel 2, by using the friction body 6 heat The handwriting of the color changing ink 75 can be rubbed. Moreover, the thermochromic writing instrument 1 of the fourth invention can obtain a high weight of the entire writing instrument as compared with a light-transmitting and gas-permeable material. When rubbing the handwriting of the discolorable ink 75, the force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

[5] As an embodiment of the invention of the present application, the weight of the entire writing instrument may be set in the range of 12 grams to 40 grams.

When the weight of the entire writing instrument is in the range of 12 grams to 40 grams, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, and the feeling of fatigue given to the hand can be reduced, and at the time of writing There is no risk of obstructing the movement of the thermochromic writing instrument. The weight of the entire writing instrument refers to the total weight when the cap 5 is attached to the shaft cylinder 2 (that is, the total weight of the cap 5, the shaft cylinder 2, the friction body 6, and the refill 7).

[6] As an embodiment of the invention of the present application, a refill 7 in which a water-based thermochromic ink 75 is accommodated in the interior and provided with a nib 71 capable of ejecting the thermochromic ink 75 at the front end is provided in the shaft tube 2. interchangeably accommodated, a thermochromic writing instrument comprising by projecting nib 71 from the front end of the barrel 2, have a structure in which an ink containing portion of the refill 7 is made of a light-shielding property and gas impermeable material Good .

Since the ink storage portion of the refill 7 is made of a light-shielding and gas-impermeable material, the thermochromic ink 75 can be prevented from light deterioration even when exposed to light such as sunlight. It is possible to prevent the moisture of the thermochromic ink 75 from permeating through the ink containing portion of the refill 7 by long-term storage, and to prevent the handwriting density of the thermochromic ink 75 from decreasing.

  In the present invention, the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. For example, the base material of the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. Alternatively, when the base material of the ink storage portion of the refill 7 is made of a light-transmitting or gas-permeable material, the outer surface or the inner surface of the base material of the ink storage portion is made of a light-shielding and gas-impermeable material. The structure etc. which form a layer are mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

[7] As an embodiment of the invention of the present application, a water-based thermochromic ink 75 is housed inside and a pen tip 71 capable of discharging the thermochromic ink 75 is provided at the front end, and the shaft cylinder 2 of the thermochromic writing instrument. The refill for a thermochromic writing instrument that is accommodated in the refill may be configured so that the ink accommodating portion of the refill 7 is made of a light-shielding and gas-impermeable material.

The ink storage portion of the thermochromic writing refill 7 is made of a light-shielding and gas-impermeable material, so that even if it is exposed to light such as sunlight in the state of being accommodated in the shaft tube 2, it is thermally discolored. The photochromic ink 75 can be prevented from being photodegraded, and the moisture of the thermochromic ink 75 can be prevented from passing through the ink containing portion of the refill 7 during long-term storage in a high temperature environment. Can prevent the handwriting density from decreasing.

  In the present invention, the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. For example, the base material of the ink containing portion of the refill 7 is made of a light-shielding and gas-impermeable material. Alternatively, when the base material of the ink storage portion of the refill 7 is made of a light-transmitting or gas-permeable material, the outer surface or the inner surface of the base material of the ink storage portion is made of a light-shielding and gas-impermeable material. The structure etc. which form a layer are mentioned. Examples of the light-shielding and gas-impermeable material include stainless steel, aluminum, aluminum alloy, copper, copper alloy, zinc, zinc alloy, titanium, titanium alloy, tin, bell alloy, nickel, nickel alloy, iron, iron Examples include metal materials such as alloys. Examples of the translucent material include synthetic resin and glass. Examples of the gas permeable material include synthetic resin, ceramic, wood, paper, and leather.

-Thermochromic ink In the present invention, the thermochromic ink 75 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. 13, the shape of the curve plotting the change in the color density due to the temperature change is contrary to the case where the temperature is raised from the lower temperature side than the color change temperature range, from the higher temperature side than the color change temperature range. The color changes by following different paths depending on the downward movement, and the color development state in the low temperature range below the complete color development temperature (t1) or the color disappearance state in the high temperature range above the complete color erase temperature (t4) is specified. It is preferable to apply a color memory retention type thermochromic ink that can be stored and retained in a temperature range [temperature range between t2 and t3 (substantially two-phase retention temperature range)]. In FIG. 13, 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 part 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 decoloration temperature (t4)] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point [complete It is effective to set the color development temperature (t1)] within a 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 body.

  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 less than 0.5 μm, it is difficult to show high color development. .

  The reversible thermochromic microcapsule pigment is dispersed in an aqueous medium and 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. be able to. 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.

Friction body Examples of the elastic material constituting the friction body 6 include elastic synthetic resins (rubber and elastomer), such as silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene). -Ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM) and the like.

  The present invention can avoid photodegradation of thermochromic ink even when exposed to light such as sunlight, and the moisture of thermochromic ink permeates through the shaft tube during long-term storage in a high temperature environment. Can be suppressed, and the reduction in the density of the handwriting of the thermochromic ink can be prevented.

It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is a longitudinal cross-sectional view which shows the state which mounted | wore the pen-tip side with the cap in the 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. It is a longitudinal cross-sectional view which shows the cap of FIG. It is a longitudinal cross-sectional view which shows the refill of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

<First Embodiment>
A first embodiment of the thermochromic writing instrument of the present invention is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably mounted on the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided at the rear end of the shaft cylinder 2.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front port 31 whose base material is made of metal, a cylindrical front shaft main body 32 whose base material fixed to the rear end of the front port 31 is made of metal or synthetic resin, and the front shaft main body. The base material fixed to the rear end of 32 consists of the cylindrical connection cylinder 33 which consists of metals. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft 4 main body 41 whose base material is made of metal and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Friction body The friction body 6 made of an elastic material is fixed to the rear end of the support cylinder 42 fixed to the rear end of the rear shaft 4. Specifically, the friction body 6 made of an elastic material is fixed to the rear end opening of the support cylinder 42 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time. The friction body 6 and the support cylinder 42 may be provided detachably with respect to the rear shaft 4 (shaft cylinder 2).

Cap The cap 5 is composed of a cap body 51 whose base material is made of metal, an inner cap 52 made of a synthetic resin housed in the cap body 51, and a pen tip made of an elastic material housed in the inner cap 52 A seal member 53, a crown 54 connected to the top of the inner cap 52 and the top of the cap body 51, the base material made of metal, and a clip 55 provided on the outer surface of the cap body 51, the base material made of metal. Become.

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The refill 7 includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and a synthetic resin ink containing tube 73 to which the holder 72 is fixed to the front end portion. , And a synthetic resin tail plug 74 fixed to the rear end portion of the ink containing tube 73.

  The nib 71 is composed of a tip body (ballpoint tip) having a base made of metal and holding a ball rotatably at the front end. Inside the nib 71, the holder 72, and the ink containing tube 73 (that is, the ink containing portion), a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are arranged, and the thermochromic color is changed. The follower 76 made of a high-viscosity fluid that moves forward by the consumption of the reactive ink 75 is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is pressed against the support cylinder 42 at the rear end of the rear shaft 4 (that is, the front end of the support cylinder 42).

  A spring is received in the tip body. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 by long-term storage below.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided at the rear end of the rear shaft 4 so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is removed from the shaft cylinder 2. Thus, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. Further, the thermochromic writing instrument 1 of the present embodiment has a light-transmitting and gas-permeable material because the shaft tube 2 (at least the rear shaft main body 41) and the cap 5 (at least the cap main body 51) are made of a metal material. Compared to the above, it is possible to obtain a high weight of the entire writing instrument, thereby reducing the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 using the friction body 6 and giving the hand a feeling of fatigue. Can be relaxed.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

<Second Embodiment>
A second embodiment of the thermochromic writing instrument 1 of the present invention is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably attached to the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided on the top of the cap 5.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front end 31 made of metal as a base material, a metal or synthetic resin cylindrical front shaft main body 32 fixed to the rear end of the front end 31, and a rear of the front shaft main body 32. The base material fixed to the end is formed of a cylindrical connecting tube 33 made of metal. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft main body 41 whose base material is made of metal, and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Cap The cap 5 has a cap body 51 made of a metal base, an inner cap 52 made of a synthetic resin, one end of which is housed in the cap body 51 and the other end protruding outside from the top of the cap body 51, A pen tip seal member 53 made of an elastic material housed in the inner cap 52 and a clip 55 provided on the outer surface of the cap main body 51 and made of a metal base.

Friction body A friction body 6 made of an elastic material is fixed to the top of the inner cap 52. Specifically, the friction body 6 made of an elastic material is fixed to the opening at the top of the inner cap 52 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time.

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The refill 7 includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and a synthetic resin ink containing tube 73 to which the holder 72 is fixed to the front end portion. , And a synthetic resin tail plug 74 fixed to the rear end portion of the ink containing tube 73.

  The pen tip 71 is composed of a chip body (ballpoint pen tip) in which a base material having a ball rotatably held at a front end is made of metal. Inside the nib 71, the holder 72, and the ink containing tube 73 (that is, the ink containing portion), a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are arranged, and the thermochromic color is changed. The follower 76 made of a high-viscosity fluid that moves forward by the consumption of the reactive ink 75 is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is pressed against the support cylinder 42 at the rear end of the rear shaft 4 (that is, the front end of the support cylinder 42).

  A spring is accommodated in the tip body inside the nib 71. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from passing through the shaft tube 2 and the cap 5 by long-term storage below.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided on the top of the cap 5, so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is mounted on the rear end of the shaft tube 2. In this state, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. Further, the thermochromic writing instrument 1 of the present embodiment has a light-transmitting and gas-permeable material because the shaft tube 2 (at least the rear shaft main body 41) and the cap 5 (at least the cap main body 51) are made of a metal material. Compared to the above, it is possible to obtain a high weight of the entire writing instrument, thereby reducing the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 using the friction body 6 and giving the hand a feeling of fatigue. Can be relaxed.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

<Third Embodiment>
A third embodiment of the thermochromic writing instrument 1 of the present invention (embodiment of the refill 7 for thermochromic writing instrument of the present invention) is shown in FIGS. The thermochromic writing instrument 1 of the present embodiment is accommodated in a shaft cylinder 2 composed of a front shaft 3 and a rear shaft 4 in an exchangeable manner in the shaft cylinder 2, and a thermochromic ink 75 is accommodated therein. The refill 7 includes a cap 5 that is detachably mounted on the pen tip 71 side of the shaft cylinder 2, and a friction body 6 that is provided at the rear end of the shaft cylinder 2.

-Shaft tube The shaft tube 2 is configured such that the front shaft 3 and the rear shaft 4 are detachable by screwing. The front shaft 3 includes a front port 31 whose base material is made of metal, a cylindrical front shaft main body 32 whose base material fixed to the rear end of the front port 31 is made of metal or synthetic resin, and the front shaft main body. The base material fixed to the rear end of 32 consists of the cylindrical connection cylinder 33 which consists of metals. A front end hole 34 is provided at the front end of the front end 31, and a pen tip 71 projects from the front end hole 34 to the outside. A male screw is formed on the outer surface of the connecting tube 33 at the rear end of the front shaft 3.

  The rear shaft 4 includes a rear shaft main body 41 whose base material is made of metal, and a cylindrical support tube 42 made of metal or synthetic resin attached to the rear end of the rear shaft main body 41. A female screw is formed on the inner surface of the front end opening of the rear shaft 4. The female screw is detachably screwed with a male screw on the outer surface of the connection tube 33 fixed to the rear end of the front shaft 3.

Friction body The friction body 6 made of an elastic material is fixed to the rear end of the support cylinder 42 fixed to the rear end of the rear shaft 4. Specifically, the friction body 6 made of an elastic material is fixed to the rear end opening of the support cylinder 42 by fitting. The friction body 6 rubs the handwriting by the thermochromic ink 75, and the handwriting can be thermally discolored by frictional heat generated at that time. The friction body 6 and the support cylinder 42 may be provided detachably with respect to the rear shaft 4 (shaft cylinder 2).

Cap The cap 5 is composed of a cap body 51 whose base material is made of metal, an inner cap 52 made of a synthetic resin housed in the cap body 51, and a pen tip made of an elastic material housed in the inner cap 52 The seal member 53, a crown 54 made of metal for the base material connected to the top of the inner cap 52 and the top of the cap body 51, and a clip 55 made of metal for the base material provided on the outer surface of the cap body 51. .

  The inner surface of the inner cap 52 can be fitted to the outer surface of the front shaft 3 and the outer surface of the rear shaft 4. When the cap 5 is attached to the pen tip 71 side of the barrel 2, the pen tip seal member 53 is in close contact with the front end of the pen tip 71 and seals the pen tip 71. The head crown 54 is fixed to the top of the cap body 51.

Refill The thermochromic writing instrument refill 7 of the present embodiment includes a pen tip 71, a synthetic resin holder 72 that holds the rear end portion of the pen tip 71, and the holder 72 fixed to the front end portion. The base material includes an ink containing tube 73 made of metal and a synthetic resin tail plug 74 fixed to the rear end of the ink containing tube 73.

  The pen tip 71 is composed of a chip body (ballpoint pen tip) in which a base material having a ball rotatably held at a front end is made of metal. Inside the nib 71, the holder 72, and the ink storage tube 73, a thermochromic ink 75 made of water-based gel and a rear end of the thermochromic ink 75 are disposed. A follower 76 made of a high-viscosity fluid moving forward is filled.

  The tail plug 74 is provided with a vent hole 74a. Furthermore, a plurality of elastic leg pieces 74b that are elastically deformable in the radial direction are formed at the rear end of the tail plug 74. A notch-shaped vent groove communicating with the vent hole 74a is formed between the elastic leg pieces 74b. The elastic leg piece 74b is in pressure contact with the support cylinder 42 at the rear end of the rear shaft 4 (the front end of the support cylinder 42).

  A spring is received in the tip body. The spring pushes the ball forward, bringing the ball into intimate contact with the inward front edge.

-Action The thermochromic writing instrument 1 of the present embodiment is a cap in which the nib 71 is sealed by the nib seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the nib 71 side. The refill 7 accommodated in the shaft cylinder 2 is completely hidden from the outside by the main body 51, the connecting cylinder 33 whose base material is made of metal, and the rear shaft main body 41 whose base material is made of metal. Furthermore, in the thermochromic writing instrument 1 of the present embodiment, the ink containing portion (that is, at least the ink containing tube 73) of the refill 7 is formed of metal. Thereby, the thermochromic writing instrument 1 of the present embodiment can prevent light degradation of the thermochromic ink 75 by attaching the cap 5 to the front shaft 3 when not in use (during storage), and at a high temperature environment. It is possible to sufficiently prevent moisture of the thermochromic ink 75 from permeating through the ink container, the shaft cylinder 2 and the cap 5 by long-term storage.

  In the thermochromic writing instrument 1 of the present embodiment, the friction body 6 is provided at the rear end of the rear shaft 4 so that the cap 5 is mounted on the pen tip 71 side and the cap 5 is removed from the shaft cylinder 2. Thus, the handwriting of the thermochromic ink 75 can be rubbed using the friction body 6. In addition, the thermochromic writing instrument 1 of the present embodiment has a shaft cylinder 2 (at least the rear shaft main body 41), a cap 5 (at least the cap main body 51), and an ink storage portion (at least the ink storage tube 73) of the refill 7 as a metal material. Therefore, compared to a material having translucency and gas permeability, it is possible to obtain a high weight of the entire writing instrument, and thus when rubbing the handwriting of the thermochromic ink 75 using the friction body 6, The force applied to the handwriting can be reduced, and the feeling of fatigue given to the hand can be reduced.

  The total weight of the thermochromic writing instrument 1 of the present embodiment is set in the range of 12 grams to 40 grams. Thereby, the force applied to the handwriting when rubbing the handwriting of the thermochromic ink 75 can be reduced, the feeling of fatigue given to the hand can be alleviated, and the movement of the thermochromic writing instrument 1 during writing can be prevented.

  The thermochromic writing instrument refill 7 according to the present embodiment is configured such that the ink storage portion (at least the ink storage tube 73) of the refill 7 is made of a metal material, so that the refill 7 can receive sunlight, etc. Even when exposed to light, the thermochromic ink 75 can be prevented from photodegrading, and the moisture of the thermochromic ink 75 can permeate through the ink container of the refill 7 during long-term storage in a high temperature environment. Can be suppressed, and a reduction in handwriting density of the thermochromic ink 75 can be prevented.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 3 Front shaft 31 Front port 32 Front shaft main body 33 Connection cylinder 34 Front end hole 4 Rear shaft 41 Rear shaft main body 42 Support cylinder 5 Cap 51 Cap main body 52 Inner cap 53 Nib seal member 54 Head crown 55 Clip 6 Friction body 7 Refill 71 Nib 72 Holder 73 Ink receiving tube 74 Tail plug 74a Vent hole 74b Elastic leg piece 75 Thermochromic ink 76 Follower

Claims (7)

  A refill with a pen tip that contains water-based thermochromic ink inside and a pen tip that can eject the thermochromic ink at the front end is stored in the shaft tube in a replaceable manner, and the pen tip protrudes from the front end of the shaft tube. A thermochromic writing instrument, wherein the shaft tube is made of a light-shielding and gas-impermeable material.   The shaft cylinder includes a front shaft having a front end hole through which a pen tip projects, and a rear shaft that is detachably screwed to the front shaft, and at least the rear shaft is a light-shielding and gas-impermeable material. Provided with a detachable cap on the nib side of the shaft cylinder, the cap is made of a light-shielding and gas-impermeable material, and when the cap is mounted on the front shaft, the nib is sealed and refilled The thermochromic writing instrument according to claim 1, which is concealed invisible from the outside.   The thermal discoloration according to claim 2, wherein a friction body capable of thermally discoloring the handwriting of the thermochromic ink by rubbing the handwriting of the thermochromic ink and causing the heat discoloration by the frictional heat generated at that time is provided at a rear end portion of the rear shaft. Sex writing instrument.   The thermochromic writing instrument according to claim 2, wherein a friction body capable of thermally changing the thermochromic ink handwriting by frictional heat generated by rubbing the handwriting of the thermochromic ink is provided on the top of the cap.   The thermochromic writing instrument according to claim 3 or 4, wherein the weight of the entire writing instrument is set in a range of 12 to 40 grams.   A refill with a pen tip that contains water-based thermochromic ink inside and a pen tip that can eject the thermochromic ink at the front end is stored in the shaft tube in a replaceable manner, and the pen tip protrudes from the front end of the shaft tube. A thermochromic writing instrument, wherein the ink storage part of the refill is made of a light-shielding and gas-impermeable material.   A refill for a thermochromic writing instrument that contains a water-based thermochromic ink inside and a pen tip that can eject the thermochromic ink at the front end, and is exchangeably contained in the shaft of the thermochromic writing instrument. A refill for a thermochromic writing instrument, wherein the ink storage portion of the refill is made of a light-shielding and gas-impermeable material.

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