JP5681856B2 - Thermochromic writing instrument - Google Patents

Description

The present invention relates to a thermochromic writing instrument.

In Patent Document 1, a writing body is accommodated in a shaft cylinder so as to be movable in the front-rear direction, an operation portion is provided on an outer surface of the shaft tube, and the pen tip of the writing body is attached to the shaft tube by operating the operation portion. It is configured to be able to protrude and retract from a front end hole, and contains a thermochromic ink inside the cursive body, a pen tip capable of discharging the thermochromic ink is provided at the front end of the cursive body, and an outer surface of the shaft cylinder (for example, A thermochromic writing instrument provided with a friction part capable of thermally discoloring the handwriting of the thermochromic ink on the front end part of the shaft cylinder or the rear end part of the shaft cylinder by rubbing the handwriting of the thermochromic ink. It is disclosed.

In the conventional thermochromic writing instrument, when the friction portion is provided at the front end portion of the shaft tube, an operation for immersing the pen tip (that is, an operation for releasing the pen tip protruding state) is required to use the friction portion. is there. For this reason, there is a possibility that it is not possible to quickly shift from the written state to the frictional discoloration work. Further, in the conventional thermochromic writing instrument, when the friction part is provided at the rear end part of the shaft tube, in order to use the friction part, it is necessary to change the writing instrument body from the gripping state at the time of writing, There is a possibility that it is not possible to quickly shift from the written state to the friction discoloration work.

International Publication No. 2008/105227 Pamphlet

The present invention is intended to solve the above-described conventional problems and to provide a thermochromic writing instrument that can quickly shift from a writing state to a frictional discoloration work.
In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

[1] In the first invention of the present application, a thermochromic ink is accommodated in the cursive body 6, and a nib 61 capable of discharging the thermochromic ink is provided at the front end of the cursive body 6. 6 is a thermochromic writing instrument that accommodates in the shaft cylinder 2 and allows writing with the pen tip 61 protruding from the front end hole 31 of the shaft cylinder 2, A friction body 7 made of an elastic material capable of thermally discoloring the thermochromic ink handwriting by frictional heat generated by rubbing the handwriting of the discoloration ink is provided, and an operation portion 72 of the friction body 7 is provided on the shaft cylinder 2. Provided on the outer surface of the front end portion, and configured to move the friction body 7 back and forth by operating the operation portion 72, the front end portion of the shaft tube 2 is provided with an inner tube portion 3 provided with a front end hole 31 at the front end; An outer cylindrical portion 4 that surrounds the outer periphery of the inner cylindrical portion 3 and protrudes forward, and extends radially through the outer cylindrical portion 4 And a slide hole 41 extending in the front-rear direction and an annular recess 5 formed between the inner cylinder part 3 and the outer cylinder part 4 and opening forward, and the friction body 7 has an inner hole 71a in the front-rear direction. A tubular portion 71 provided in a penetrating manner and an operating portion 72 projecting from the outer surface of the tubular portion 71 are provided, and the rear portion of the tubular portion 71 of the friction body 7 is provided in the annular recess 5 so as to be accommodated. The operation part 72 is projected from the slide hole 41 in the radial direction, and the operation part 72 is configured to be movable back and forth along the slide hole 41 .

The thermochromic writing instrument 1 according to the first aspect of the present invention can rub the thermochromic ink with the frictional heat generated by rubbing the thermochromic ink on the front end portion of the shaft tube 2. The friction body 7 made of an elastic material is provided, the operation portion 72 of the friction body 7 is provided on the outer surface of the front end portion of the shaft cylinder 2, and the friction body 7 can be moved back and forth by operating the operation portion 72. Thus, when the friction part is used, the operation unit 72 can be operated from the state of gripping the writing instrument main body during writing, and it is not necessary to change the writing instrument main body, and the transition from the writing state to the frictional discoloration work can be made quickly. The thermochromic writing instrument 1 of the first invention obtains a simple structure that can quickly shift from a written state to a frictional discoloration work.

[2] In the second invention of the present application, in the thermochromic writing instrument 1 of the first invention, when the pen tip 61 is in a protruding state from the front end hole 31 of the shaft cylinder 2, the operation unit 72 is operated. Therefore, it is required that the front end of the friction body 7 is positioned in front of the pen tip 61.

In the thermochromic writing instrument 1 according to the second aspect of the present invention, when the pen tip 61 is in a protruding state from the front end hole 31 of the shaft tube 2, the front end of the friction body 7 is moved to the pen by operating the operation portion 72. By being positioned in front of the tip 61, stable friction discoloration work can be performed.

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

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

In the present embodiment, as shown in FIG. 5, the shape of the curve plotting the change in the color density due to the temperature change is higher than the color change temperature range, contrary 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 route from the case of descending from the side, and the color develops in a low temperature region below the complete color development temperature (t ₁ ), or the color erases in a high temperature region above the complete color erase temperature (t ₄ ). A color memory retention type thermochromic ink whose state can be stored and retained in a specific temperature range [temperature range between t _{2 and} t ₃ (substantially two-phase retention temperature range)] is applied. In FIG. 5, 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 embodiment, the color change temperature of the thermochromic ink due to the frictional heat of the friction body 7 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.). 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 7.

Friction body In the present invention, it is preferable that the friction body 7 is made of an elastic resin (rubber or elastomer). Examples of the resin having elasticity include silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, Examples thereof include polyester resins and ethylene propylene diene rubber (EPDM). The elastic material constituting the friction body 7 is preferably made of a low-abrasion elastic material that does not generate wear debris during friction, rather than a high-abrasion elastic material (for example, an eraser).

The present invention can provide a thermochromic writing instrument that can quickly shift from a writing state to a frictional discoloration operation.

It is a principal part longitudinal cross-sectional view which shows the writable state (friction body immersion state) of embodiment of this invention. It is a principal part longitudinal cross-sectional view which shows the non-writing state (friction body protrusion state) of FIG. It is a side view of FIG. FIG. 3 is a side view of FIG. 2. It is explanatory drawing which shows the color change behavior of a thermochromic ink.

An embodiment of the present invention is shown in FIGS.
The thermochromic writing instrument 1 of the present embodiment includes a shaft cylinder 2 and a writing body 6 accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction. A pen point 61 of the writing body 6 is provided so as to be able to protrude and retract from the front end hole 31 of the shaft cylinder 2. In the present invention, the pen tip 61 does not have to be freely movable, and the pen tip 61 may always protrude from the front end hole 31 of the shaft tube 2. That is, at least the pen tip 61 only has to protrude from the front end hole 31 during writing.

-Shaft tube The shaft tube 2 is made of synthetic resin or metal. An inner tube portion 3 having a front end hole 31 at the front end is provided at the front end portion of the shaft tube 2. A resilient body 8 (for example, a compression coil sling) that biases the writing body 6 backward is held on the inner wall of the inner cylindrical portion 3. The inner cylindrical portion 3 has a tapered front end portion. The inner cylinder portion 3 surrounds the front end portion of the cursive body 6.

Further, an outer cylinder portion 4 is formed at the front end portion of the shaft cylinder 2 so as to surround the outer periphery of the inner cylinder portion 3 and protrude forward. A slide hole 41 extending in the axial direction is provided in the outer cylinder portion 4 in the radial direction.

Between the inner cylinder part 3 and the outer cylinder part 4, an annular recess 5 that opens forward is formed.

Friction body The friction body 7 includes a cylindrical portion 71 in which front and rear inner holes 71 a are provided, and an operation portion 72 that protrudes radially outward from the outer surface of the cylindrical portion 71. The friction body 7 is integrally formed of an elastic material.

The front part of the cylindrical part 71 bulges outward in the radial direction and becomes a friction part. The rear part of the cylindrical part 71 is accommodated in the annular recess 5 at the time of writing. The rear portion of the cylindrical portion 71 is exposed forward of the annular recess 5 when the friction body 7 is used.

The operation portion 72 protrudes radially outward from the slide hole 41. The operation part 72 is movable in the front-rear direction along the slide hole 41. By operating the operating portion 72 in the front-rear direction, the friction body 7 can move in the front-rear direction with respect to the shaft tube 2. On the surface of the operation portion 72, an uneven portion for preventing slipping is formed.

The axial length of the outer cylindrical portion 4 is set to be smaller than the axial length of the inner cylindrical portion 3. That is, the front end of the inner cylinder portion 3 protrudes forward from the front end of the outer cylinder portion 4. Thereby, the front end part of the friction body 7 can be largely exposed to the outside, and the friction operation is facilitated.

The axial length of the inner cylindrical portion 3 is set to be longer than the axial length of the friction body 7 or is set substantially equal to the axial length of the friction body 7. Thereby, when the friction part is retracted at the time of writing, it can be avoided that the front end part of the friction part hinders writing.

Cursive body The cursive body 6 includes a pen tip 61 (for example, a ballpoint pen tip), an ink storage tube in which the pen tip 61 is press-fitted and fixed to the front end opening, and a thermochromic ink filled in the ink storage tube. And a follower (for example, a high-viscosity fluid) that fills the rear end of the thermochromic ink and moves forward as the thermochromic ink is consumed.

The thermochromic writing instrument 1 of the present embodiment can rub the thermochromic ink with the frictional heat generated by rubbing the handwriting of the thermochromic ink on the front end portion of the shaft tube 2. The friction body 7 made of an elastic material is provided, the operation portion 72 of the friction body 7 is provided on the outer surface of the front end portion of the shaft cylinder 2, and the friction body 7 can be moved back and forth by operating the operation portion 72. Thus, when the friction part is used, the operation unit 72 can be operated from the state where the writing instrument main body is gripped at the time of writing, and it is not necessary to change the writing instrument main body.

In the thermochromic writing instrument 1 according to the present embodiment, the front end of the friction body 7 is moved to the pen tip by operating the operation unit 72 when the pen tip 61 protrudes from the front end hole 31 of the shaft tube 2. By being positioned in front of 61, stable discoloration work can be performed.

In the thermochromic writing instrument 1 of the present embodiment, the front end portion of the shaft tube 2 surrounds the inner tube portion 3 provided with the front end hole 31 at the front end and the outer periphery of the inner tube portion 3 and protrudes forward. An outer cylindrical portion 4, a slide hole 41 extending in the radial direction in the outer cylindrical portion 4 and extending in the front-rear direction, and an annular recess formed between the inner cylindrical portion 3 and the outer cylindrical portion 4 and opening forward. 5, the friction body 7 includes a cylindrical portion 71 having an inner hole 71 a extending through the front and rear, and an operation portion 72 projecting from the outer surface of the cylindrical portion 71. A rear portion of the cylindrical portion 71 of the friction body 7 is provided so as to be accommodated, and the operation portion 72 protrudes in the radial direction from the slide hole 41, and the operation portion 72 can be moved back and forth along the slide hole 41. By being configured in this way, a simple structure capable of quickly shifting from the written state to the frictional discoloration work is obtained.

DESCRIPTION OF SYMBOLS 1 Thermochromic writing instrument 2 Shaft cylinder 3 Inner cylinder part 31 Front end hole 4 Outer cylinder part 41 Slide hole 5 Annular recessed part 6 Writing body 61 Pen tip 7 Friction body 71 Cylindrical part 71a Inner hole 72 Operation part 8 Elastic body

Claims (2)

A thermochromic ink is accommodated in the cursive body, a pen tip capable of ejecting the thermochromic ink is provided at the front end of the cursive body, the cursive body is accommodated in the shaft cylinder, and a front end hole of the shaft cylinder A thermochromic writing instrument that enables writing with a pen tip protruding from the front end of the shaft tube, and the thermochromic ink is rubbed with the frictional heat generated by rubbing the handwriting of the thermochromic ink on the front end of the shaft cylinder A friction body made of an elastic material capable of thermally discoloring the handwriting is provided, an operation portion of the friction body is provided on an outer surface of a front end portion of the shaft cylinder, and the friction body can be moved back and forth by operating the operation portion. The front end portion of the shaft tube includes an inner tube portion having a front end hole at the front end, an outer tube portion surrounding the outer periphery of the inner tube portion and protruding forward, and penetrating radially through the outer tube portion. Is formed between the inner cylindrical portion and the outer cylindrical portion, and is formed in the forward direction. An annular recess that opens, and the friction body includes a cylindrical portion having inner holes penetrating in the front-rear direction and an operation portion that protrudes from an outer surface of the cylindrical portion, and the friction portion is provided in the annular recess. A cylindrical portion of a body is provided so as to be accommodated, the operation portion is protruded in a radial direction from the slide hole, and the operation portion is configured to be movable back and forth along the slide hole. A thermochromic writing instrument. 2. The thermochromic writing instrument according to claim 1, wherein the front end of the friction body is positioned in front of the pen tip by operating the operation portion when the pen tip is protruding from the front end hole of the shaft tube.

Images