JP5694706B2 - Thermochromic writing instrument - Google Patents

Description

The present invention relates to a thermochromic writing instrument.

Conventionally, in Patent Document 1, thermochromic ink is accommodated inside the writing instrument body, a pen tip capable of discharging thermochromic ink is provided at the front end of the writing instrument body, and thermochromic is provided on the outer surface of the writing instrument body. A thermochromic writing instrument provided with a friction part capable of thermally discoloring the handwriting by rubbing the handwriting of the ink and the frictional heat generated at that time, provided with an elastic member on the front outer surface of the writing instrument body, There is described a thermochromic writing instrument characterized in that it becomes a gripping part that can be gripped with fingers or the like during writing, and becomes a gripping part and a friction part when rubbing the handwriting of thermochromic ink.

JP 2009-208313 A

The thermochromic writing instrument of Patent Document 1 has a large outer diameter of the gripping part, is not easy to grip properly, and is bulky and inconvenient to carry.

The present invention solves the above-mentioned conventional problems, can properly grip the writing instrument body during writing, eliminates the need to make the entire gripping part large diameter, and is a thermochromic writing instrument that is convenient to carry Is to provide.
In the present invention, “front” refers to the pen tip side of the writing instrument body. “Back” refers to the side of the writing instrument body opposite the pen tip.

1st invention of this application is equipped with the pen tip 6 in which the thermochromic ink is accommodated in the inside of the writing instrument main body 2, and the said thermochromic ink can be discharged in the end of the said writing instrument main body 2, The said thermochromic ink is used. A thermochromic property in which the thermochromic handwriting formed on the writing surface is rubbed and the frictional part 31 capable of thermally discoloring the thermochromic handwriting by the frictional heat generated at that time is provided in the writing instrument body 2. A writing instrument,
Projecting to the rear outer surface of the writing instrument body 2, provided with a clip 4 projecting radially outward, a portion of the outer peripheral surface of the grip portion 3 of the writing instrument body 2, the clip 4 identical radially outwardly and It is a requirement that the friction part 31 formed of a non-annular protrusion is formed and the friction part 31 can be clamped with a finger during writing.

The thermochromic writing instrument 1 according to the first aspect of the present invention forms a friction part 31 formed of a non-annular protrusion projecting radially outward on a part of the outer peripheral surface of the grip part 3 of the writing instrument body 2 during writing. Since the friction part 31 can be clamped with a finger, the writing instrument body 2 can be properly gripped at the time of writing, and the entire gripping part 3 does not need to have a large diameter. Become. The grip portion 3 is a portion provided at the front portion of the writing instrument body 2 and gripped during writing. The non-annular protrusion is provided on a part of an arbitrary outer peripheral surface of the grip portion 3 (for example, the outer peripheral surface of the front portion of the grip portion, the outer peripheral surface of the intermediate portion of the grip portion, or the outer peripheral surface of the rear portion of the grip portion). Is not an annular projection provided on the entire circumference of an arbitrary outer peripheral surface of the grip portion 3.

According to a second invention of the present application, in the thermochromic writing instrument 1 of the first invention, the friction portion 31 is made of an elastic material , and the friction portion 31 is radially outward compared to the rear portion. It is a requirement to protrude significantly .

The thermochromic writing instrument 1 according to the second aspect of the invention can easily discolor the thermochromic handwriting using the friction portion 31.

The third invention of the present application requires that, in the first or second thermochromic writing instrument 1, the grip portion 3 and the friction portion 31 are integrally formed of an elastic material.

In the thermochromic writing instrument 1 of the third invention, the friction part 31 can be easily formed in the grip part 3 of the writing instrument body 2.

In the present invention, examples of the elastic material include elastic synthetic resins (rubbers and elastomers), such as silicone resins, SBS resins (styrene-butadiene-styrene copolymers), SEBS resins (styrene-ethylene-). Butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, olefin resin, ethylene propylene diene rubber (EPDM), and the like.

The elastic material is preferably made of a low-abrasion elastic material that hardly generates wear debris during friction rather than a high-abrasion elastic material (for example, an eraser).

-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 is decolored by heating from a colored state, a color memory retaining type that reversibly stores 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.

In the present invention, as shown in FIG. 7, the shape of the curve in which the change in color density due to temperature change is plotted, the temperature is raised from the lower temperature side than the color change temperature range, as opposed to the case where the temperature is raised from the lower temperature side than the color change temperature range. The color changes by following a different path from the case of lowering, 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. 7, 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.

The substantial two-phase holding temperature range can be set according to the purpose, but in the present invention, the high temperature side discoloration point [complete decoloring temperature (t ₄ )] is 25 ° C. to 95 ° C. (preferably 36 ° C. ˜90 ° C.), and the low temperature side discoloration point [complete color development temperature (t ₁ )] may be set in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). It is valid. Accordingly, 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 thermochromic writing instrument of the present invention can properly hold the writing instrument body at the time of writing, eliminates the need to make the entire gripping portion have a large diameter, makes the whole slim and convenient for carrying.

It is a side view which shows 1st Embodiment of the thermochromic writing instrument of this invention. It is a front view of FIG. It is explanatory drawing which shows the state (state which clamped the friction part with the finger | toe) which hold | gripped the thermochromic writing instrument of FIG. It is a side view which shows 2nd Embodiment of the thermochromic writing instrument of this invention. FIG. 5 is a front view of FIG. 4. It is explanatory drawing which shows the state (state which clamped the friction part with the finger | toe) which hold | gripped the thermochromic writing instrument of FIG. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

<First Embodiment>
A first embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 according to the present embodiment includes a writing instrument body 2, a grip portion 3 provided on the front outer surface of the writing tool body 2, a friction portion 31 provided on the outer surface of the grip portion 3, and the writing instrument body. 2 is provided with a clip 4 that can be held in a pocket or the like provided on the outer surface of the rear part, and an operation part 5 provided on the rear end part of the writing instrument body 2. A writing body is accommodated in the writing instrument body 2 so as to be movable in the front-rear direction. A thermochromic ink is accommodated in the cursive body, and a nib 6 capable of discharging the thermochromic ink is attached to the front end of the cursive body. The thermochromic writing instrument 1 according to the present embodiment is a rear end knock type thermochromic writing instrument in which the pen tip 6 protrudes from the front end of the writing instrument body 2 by pressing the operation part 5 at the rear end forward.

The grip portion 3 is made of an elastic material. Examples of the elastic material include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, and polyester resin. Resin, olefin resin, ethylene propylene diene rubber (EPDM), etc. are mentioned. The grip portion 3 is provided in a cylindrical shape at the front portion of the writing instrument body 2. The grip portion 3 is provided on the front outer surface of the writing instrument body 2 by means such as two-color molding or attachment of another member.

A plate-like (non-annular) projection extending in the front-rear direction protruding radially outward is integrally formed on the outer surface of the grip portion 3. That is, the friction part 31 made of a plate-like protrusion is integrally formed on the outer surface of the grip part 3. As for the said friction part 31, the front part protrudes largely radially outward compared with a rear part. Thereby, at the time of writing, when the grip part 3 of the writing instrument body 2 is gripped, the friction part 31 can be easily held in the circumferential direction by a finger. Further, since the friction portion 31 is partially protruded from the outer surface of the grip portion 3, it is possible to easily discolor the thermochromic handwriting using the friction portion 31.

Examples of the pen tip 6 include a ballpoint pen tip, a marking tip made of a fiber processed body, or a porous body.

In the thermochromic ink, the low temperature side color change point (complete color development temperature t ₁ ) is set to an arbitrary temperature in the range of −30 ° C. to −10 ° C., and the high temperature side color change point (complete color disappearance temperature t ₄ ) is 60. A reversible thermochromic ink that is set at an arbitrary temperature in the range of from 80 ° C. to 80 ° C. and has a hysteresis width ΔH in the range of from 40 ° C. to 60 ° C. is employed.

A grip portion 3 is provided on the front outer surface of the writing instrument body 2, a clip 4 is provided on the rear portion of the writing instrument body 2, and an operation section 5 is provided on the rear end portion of the writing instrument body 2.

The thermochromic writing instrument 1 of the present embodiment forms a friction part 31 made of a plate-like protrusion extending in the front-rear direction and protruding outward in the radial direction on a part of the outer peripheral surface of the grip part 3 of the writing instrument body 2. Since the friction part 31 can be clamped with a finger at the time of writing, the writing instrument body 2 can be properly gripped at the time of writing, and the entire gripping part 3 does not need to have a large diameter, and the whole becomes slim and portable. It becomes convenient.

In the thermochromic writing instrument 1 of the present embodiment, the frictional portion 31 is made of an elastic material, so that the thermochromic handwriting can be easily frictionally discolored using the frictional portion 31.

In the thermochromic writing instrument 1 of the present embodiment, the grip part 3 and the friction part 31 are integrally formed from an elastic material, whereby the friction part 31 is easily formed in the grip part 3 of the writing tool body 2. Can do.

<Second Embodiment>
A second embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 according to the present embodiment includes a writing instrument body 2, a grip portion 3 provided on the front outer surface of the writing tool body 2, a friction portion 31 provided on the outer surface of the grip portion 3, and the writing instrument body. 2 is provided with a clip 4 that can be held in a pocket or the like provided on the outer surface of the rear part, and an operation part 5 provided on the rear end part of the writing instrument body 2. A writing body is accommodated in the writing instrument body 2 so as to be movable in the front-rear direction. A thermochromic ink is accommodated in the cursive body, and a nib 6 capable of discharging the thermochromic ink is attached to the front end of the cursive body. The thermochromic writing instrument 1 according to the present embodiment is a rear end knock type thermochromic writing instrument in which the pen tip 6 protrudes from the front end of the writing instrument body 2 by pressing the operation part 5 at the rear end forward.

The grip portion 3 is made of an elastic material. Examples of the elastic material include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, and polyester resin. Resin, olefin resin, ethylene propylene diene rubber (EPDM), etc. are mentioned. The grip portion 3 is provided in a cylindrical shape at the front portion of the writing instrument body 2. The grip portion 3 is provided on the front outer surface of the writing instrument body 2 by means such as two-color molding or attachment of another member.

A point-like (non-annular) protrusion projecting radially outward is integrally formed on the front portion of the outer peripheral surface of the grip portion 3. That is, the friction part 31 formed of a dot-like protrusion is integrally formed on the front outer surface of the grip part 3. Thereby, at the time of writing, when the grip part 3 of the writing instrument body 2 is gripped, the friction part 31 can be easily held in the circumferential direction by a finger. Further, since the friction portion 31 is partially protruded from the outer surface of the grip portion 3, it is possible to easily discolor the thermochromic handwriting using the friction portion 31.

Examples of the pen tip 6 include a ballpoint pen tip, a marking tip made of a fiber processed body, or a porous body.

In the thermochromic ink, the low temperature side color change point (complete color development temperature t ₁ ) is set to an arbitrary temperature in the range of −30 ° C. to −10 ° C., and the high temperature side color change point (complete color disappearance temperature t ₄ ) is 60. A reversible thermochromic ink that is set at an arbitrary temperature in the range of from 80 ° C. to 80 ° C. and has a hysteresis width ΔH in the range of from 40 ° C. to 60 ° C. is employed.

A grip portion 3 is provided on the front outer surface of the writing instrument body 2, a clip 4 is provided on the rear portion of the writing instrument body 2, and an operation section 5 is provided on the rear end portion of the writing instrument body 2.

The thermochromic writing instrument 1 of the present embodiment forms a friction part 31 formed of a dot-like protrusion protruding radially outward on a part of the outer peripheral surface of the grip part 3 of the writing instrument body 2, and during writing, Since the friction part 31 can be held between fingers, the writing instrument main body 2 can be properly held at the time of writing, and the entire holding part 3 does not need to have a large diameter, and the whole becomes slim and convenient for carrying. .

In the thermochromic writing instrument 1 of the present embodiment, the frictional portion 31 is made of an elastic material, so that the thermochromic handwriting can be easily frictionally discolored using the frictional portion 31.

In the thermochromic writing instrument 1 of the present embodiment, the grip part 3 and the friction part 31 are integrally formed from an elastic material, whereby the friction part 31 is easily formed in the grip part 3 of the writing tool body 2. Can do.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Writing instrument main body 3 Holding part 31 Friction part 4 Clip 5 Operation part 6 Pen point F Finger

Claims (3)

Thermal discoloration formed on a writing surface using the thermochromic ink, the thermochromic ink being accommodated inside the writing instrument body, and provided with a pen tip capable of discharging the thermochromic ink at one end of the writing instrument body The thermochromic writing instrument provided with a friction part in the writing instrument body, which can thermally discolor the thermochromic handwriting with frictional heat generated by rubbing the sexual handwriting,
Provided with a clip projecting radially outward on the rear outer surface of the writing instrument body, and a friction comprising an annular projection projecting radially outward same as the clip on the outer peripheral surface of the gripping part of the writing instrument body A thermochromic writing instrument, characterized in that a part is formed and the friction part can be held between fingers during writing. 2. The thermochromic writing instrument according to claim 1, wherein the friction part is made of an elastic material , and the friction part protrudes largely outward in the radial direction compared to the rear part . The thermochromic writing instrument according to claim 1 or 2, wherein the grip portion and the friction portion are integrally formed of an elastic material.

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