JP5525696B2

JP5525696B2 - Thermochromic writing instrument

Info

Publication number: JP5525696B2
Application number: JP2008085618A
Authority: JP
Inventors: 喜博伊藤
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 2008-03-28
Filing date: 2008-03-28
Publication date: 2014-06-18
Anticipated expiration: 2028-03-28
Also published as: JP2009234154A

Description

本発明は、熱変色性筆記具及び熱変色性筆記具用レフィルに関する。 The present invention relates to a thermochromic writing instrument and a refill for a thermochromic writing instrument.

従来、熱変色性筆記具において、例えば、特許文献１、特許文献２には、内部に水性の熱変色性インキを充填したボールペンレフィルを、軸胴に収容した構成、及び、熱変色性インキによる筆跡を摩擦しその際に生じる摩擦熱で該筆跡を熱変色可能な摩擦体を、軸胴の後端やキャップの頂部に設ける構成が開示されている。 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.

特開２００６−１２３３２４号公報JP 2006-123324 A 特開２００７−２２３３０２号公報JP 2007-223302 A

従来の熱変色性筆記具は、インキ残量を確認できるように、レフィル及び軸筒を透明性材料により形成した場合、太陽光等の光に晒されると、熱変色性インキが光劣化し、熱変色性インキの筆跡の濃度が低下するおそれがある。 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.

また、従来の熱変色性筆記具において、水性の熱変色性インキは水性媒体中に熱変色性顔料（熱変色性マイクロカプセル顔料）が分散されてなり、レフィルのインキ収容部及び軸筒が、ポリプロピレンやポリカーボネイト等の一般的な合成樹脂からなる場合、高温環境下での長期の保管で、インキ中の水分が気化し、それがレフィルの側壁及び軸筒の側壁を透過しやすい。その結果、熱変色性インキの粘度が増加し、ペン先からのインキ流出性が低下したり、筆記不能となったりするおそれがある。 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.

また、従来の熱変色性筆記具は、摩擦体を使用して熱変色性インキ７５の筆跡を摩擦する際、筆記時の力に比べ比較的大きな力を被筆記面に対して加える必要があり、比較的大面積の筆跡を熱変色させる際には、手に疲労感を感じさせるおそれがある。 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.

本発明は、前記従来の問題点を解決するものであって、熱変色性インキの光劣化を回避でき、且つ、長期の保管で水性の熱変色性インキの水分が筆記体及び軸筒を透過することを抑止でき、しかも、比較的大面積の筆跡を熱変色させる際の手に与える疲労感を軽減できる熱変色性筆記具を提供しようとするものである。尚、本発明で「前」とはペン先側を指し、「後」とはその反対側を指す。また、本発明において、「キャップの頂部」とは、キャップの閉塞端側（即ちキャップ開口端の反対側）を指す。 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］本願の第１の発明は、内部に水性の熱変色性インキ７５が収容され且つ前端に前記熱変色性インキ７５が吐出可能なペン先７１を備えたレフィル７を軸筒２内に交換可能に収容し、軸筒２の前端よりペン先７１を突出させてなる熱変色性筆記具であって、前記軸筒２が遮光性且つガス非透過性の材料からなることを要件とする。 [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.

前記第１の発明の熱変色性筆記具１は、軸筒２が遮光性且つガス非透過性の材料からなることにより、太陽光等の光に晒されても、熱変色性インキ７５が光劣化することを回避でき、しかも、高温環境下での長期の保管で熱変色性インキ７５の水分が軸筒２を透過することを抑止でき、熱変色性インキ７５の筆跡の濃度低下を防止できる。 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.

尚、本発明で、軸筒２が遮光性且つガス非透過性の材料からなるとは、例えば、軸筒２の基材が遮光性且つガス非透過性の材料からなる構成、または、軸筒２の基材が透光性またはガス透過性の材料からなる場合に前記軸筒２の基材の外面または内面に、遮光性且つガス非透過性の材料からなる層を形成する構成等が挙げられる。前記遮光性且つガス非透過性の材料は、例えば、ステンレス鋼、アルミニウム、アルミニウム合金、銅、銅合金、亜鉛、亜鉛合金、チタン、チタン合金、錫、鈴合金、ニッケル、ニッケル合金、鉄、鉄合金等の金属材料が挙げられる。前記透光性の材料は、例えば、合成樹脂、ガラス等が挙げられる。前記ガス透過性の材料は、例えば、合成樹脂、セラミック、木材、紙、皮革等が挙げられる。 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］本願の第２の発明は、前記第１の発明において、軸筒２が、ペン先７１が突出される前端孔３４を備えた前軸３と、該前軸３と着脱自在に螺着される後軸４とからなり、少なくとも前記後軸４が遮光性且つガス非透過性の材料からなり、軸筒２のペン先７１側に着脱自在のキャップ５を設け、前記キャップ５が遮光性且つガス非透過性の材料からなり、前記キャップ５を前軸３に装着した際、ペン先７１が密封されるとともにレフィル７が外部より視認不能に隠蔽されることを要件とする。 [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.

前記第２の発明の熱変色性筆記具１は、非使用時（保管時）、キャップ５を前軸３外面に装着することによって、ペン先７１が密封されるとともにレフィル７が外部より視認不能に隠蔽され、それによって、熱変色性インキ７５の光劣化を防止できるとともに、高温環境下での長期の保管で熱変色性インキ７５の水分が軸筒２及びキャップ５を透過することを十分に防止できる。尚、第２の発明において、前軸３を、遮光性且つガス非透過性の材料から構成する必要はなく、前軸３がキャップ５によって完全に隠蔽可能であるなら、例えば、前軸３を、透光性且つガス透過性を有するポリプロピレン等の合成樹脂により構成してもよい。 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.

尚、本発明で、キャップ５が遮光性且つガス非透過性の材料からなるとは、例えば、キャップ５２の基材が遮光性且つガス非透過性の材料からなる構成、または、キャップ５の基材が透光性またはガス透過性の材料からなる場合に前記キャップ５の基材の外面または内面に、遮光性且つガス非透過性の材料からなる層を形成する構成等が挙げられる。前記遮光性且つガス非透過性の材料は、例えば、ステンレス鋼、アルミニウム、アルミニウム合金、銅、銅合金、亜鉛、亜鉛合金、チタン、チタン合金、錫、鈴合金、ニッケル、ニッケル合金、鉄、鉄合金等の金属材料が挙げられる。前記透光性の材料は、例えば、合成樹脂、ガラス等が挙げられる。前記ガス透過性の材料は、例えば、合成樹脂、セラミック、木材、紙、皮革等が挙げられる。 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］本願の第３の発明は、前記第２の発明において、熱変色性インキ７５の筆跡を摩擦しその際に生じる摩擦熱で前記熱変色性インキ７５の筆跡が熱変色可能な摩擦体６を、前記後軸４の後端部に設けたことを要件とする。 [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.

前記第３の発明の熱変色性筆記具１は、後軸４の後端に摩擦体６を設けたことにより、キャップ５をペン先７１側に装着した状態及びキャップ５を軸筒２から取り外した状態で、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦することができる。しかも、前記第３の発明の熱変色性筆記具１は、透光性且つガス透過性を有する材料に比べ、筆記具全体の高重量を得ることができ、それにより、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦する際、筆跡に加える力を軽減でき、手に与える疲労感を緩和できる。 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］本願の第４の発明は、前記第２の発明において、熱変色性インキ７５の筆跡を摩擦しその際に生じる摩擦熱で前記熱変色性インキ７５の筆跡が熱変色可能な摩擦体６を、前記キャップ５の頂部に設けたことを要件とする。 [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.

前記第４の発明の熱変色性筆記具１は、キャップ５の頂部に摩擦体６を設けたことにより、キャップ５をペン先７１側に装着した状態及びキャップ５を軸筒２の後端部に装着した状態で、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦することができる。しかも、前記第４の発明の熱変色性筆記具１は、透光性且つガス透過性を有する材料に比べ、筆記具全体の高重量を得ることができ、それにより、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦する際、筆跡に加える力を軽減でき、手に与える疲労感を緩和できる。 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］本願の第５の発明は、前記第３または第４の発明において、筆記具全体の重量を、１２グラム〜４０グラムの範囲に設定したことを要件とする。 [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.

前記第５の発明の熱変色性筆記具１は、筆記具全体の重量が、１２グラム〜４０グラムの範囲にあることにより、熱変色性インキ７５の筆跡を摩擦する際の筆跡に加える力を軽減でき、手に与える疲労感を緩和できるとともに、筆記時の熱変色性筆記具の動きを阻害するおそれがない。尚、筆記具全体の重量とは、キャップ５を軸筒２に装着した状態の全重量（即ち、キャップ５、軸筒２、摩擦体６及びレフィル７の総重量）をいう。 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］本願の第６の発明は、内部に水性の熱変色性インキ７５が収容され且つ前端に前記熱変色性インキ７５が吐出可能なペン先７１を備えたレフィル７を軸筒２内に交換可能に収容し、軸筒２の前端よりペン先７１を突出させてなる熱変色性筆記具であって、前記レフィル７のインキ収容部が遮光性且つガス非透過性の材料からなることを要件とする。 [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

前記第６の発明の熱変色性筆記具１は、レフィル７のインキ収容部が遮光性且つガス非透過性の材料からなることにより、太陽光等の光に晒されても、熱変色性インキ７５が光劣化することを回避でき、しかも、高温環境下での長期の保管で熱変色性インキ７５の水分がレフィル７のインキ収容部を透過することを抑止でき、熱変色性インキ７５の筆跡の濃度低下を防止できる。 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.

尚、本発明で、レフィル７のインキ収容部が遮光性且つガス非透過性の材料からなるとは、例えば、レフィル７のインキ収容部の基材が遮光性且つガス非透過性の材料からなる構成、または、レフィル７のインキ収容部の基材が透光性またはガス透過性の材料からなる場合に前記インキ収容部の基材の外面または内面に、遮光性且つガス非透過性の材料からなる層を形成する構成等が挙げられる。前記遮光性且つガス非透過性の材料は、例えば、ステンレス鋼、アルミニウム、アルミニウム合金、銅、銅合金、亜鉛、亜鉛合金、チタン、チタン合金、錫、鈴合金、ニッケル、ニッケル合金、鉄、鉄合金等の金属材料が挙げられる。前記透光性の材料は、例えば、合成樹脂、ガラス等が挙げられる。前記ガス透過性の材料は、例えば、合成樹脂、セラミック、木材、紙、皮革等が挙げられる。 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］本願の第７の発明は、内部に水性の熱変色性インキ７５が収容され且つ前端に前記熱変色性インキ７５が吐出可能なペン先７１を備え、熱変色性筆記具の軸筒２内に交換可能に収容される熱変色性筆記具用レフィルであって、前記レフィル７のインキ収容部が遮光性且つガス非透過性の材料からなることを要件とする。 [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.

前記第７の発明の熱変色性筆記用レフィル７は、インキ収容部が遮光性且つガス非透過性の材料からなることにより、軸筒２内に収容された状態において、太陽光等の光に晒されても、熱変色性インキ７５が光劣化することを回避でき、しかも、高温環境下での長期の保管で熱変色性インキ７５の水分がレフィル７のインキ収容部を透過することを抑止でき、熱変色性インキ７５の筆跡の濃度低下を防止できる。 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.

・熱変色性インキ
尚、本発明において、前記熱変色性インキ７５は、可逆熱変色性インキが好ましい。前記可逆熱変色性インキは、発色状態から加熱により消色する加熱消色型、発色状態または消色状態を互変的に特定温度域で記憶保持する色彩記憶保持型、または、消色状態から加熱により発色し、発色状態からの冷却により消色状態に復する加熱発色型等、種々のタイプを単独または併用して構成することができる。 -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.

また、前記可逆熱変色性インキに含有される色材は、従来より公知の（イ）電子供与性呈色性有機化合物、（ロ）電子受容性化合物、及び（ハ）前記両者の呈色反応の生起温度を決める反応媒体、の必須三成分を少なくとも含む可逆熱変色性組成物をマイクロカプセル中に内包させた可逆熱変色性マイクロカプセル顔料が好適に用いられる。 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.

本発明では、図１３に示すように、温度変化による着色濃度の変化をプロットした曲線の形状が、温度を変色温度域より低温側から上昇させていく場合と逆に変色温度域より高温側から下降させていく場合とで異なる経路を辿って変色し、完全発色温度（ｔ_１）以下の低温域での発色状態、または完全消色温度（ｔ_４）以上の高温域での消色状態が、特定温度域〔ｔ_２〜ｔ_３の間の温度域（実質的二相保持温度域）〕で記憶保持できる色彩記憶保持型熱変色性インキが適用されることが好ましい。図１３において、ΔＨは、ヒステリシスの程度を示す温度幅（即ちヒステリシス幅）を示す。ΔＨの値が小さいと、変色前後の両状態のうち一方の状態しか存在しえない。ΔＨの値が大きいと、変色前後の各状態の保持が容易となる。 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.

本発明では、前記熱変色性インキの摩擦部の摩擦熱による変色温度は、２５℃〜９５℃（好ましくは３６℃〜９５℃）に設定される。即ち、本発明では、前記高温側変色点〔完全消色温度（ｔ_４）〕を、２５℃〜９５℃（好ましくは、３６℃〜９０℃）の範囲に設定し、前記低温側変色点〔完全発色温度（ｔ_１）〕を、−３０℃〜＋２０℃（好ましくは、−３０℃〜＋１０℃）の範囲に設定することが有効である。それにより、常態（日常の生活温度域）で呈する色彩の保持を有効に機能させることができるとともに、可逆熱変色性インキによる筆跡を摩擦体による摩擦熱で容易に変色することができる。 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.

前記可逆熱変色性マイクロカプセル顔料は、粒子径の平均値が０．５〜５．０μｍ、好ましくは１〜４μｍの範囲にあることが好ましい。平均粒子径が５．０μｍを越える系では、ボールペンチップや多孔質ペン体の毛細間隙からの流出性が低下し、平均粒子径が０．５μｍ未満の系では高濃度の発色性を示し難くなる。 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. .

前記可逆熱変色性マイクロカプセル顔料は、水性媒体中に分散され、インキ組成物全量に対し、２〜５０重量％（好ましくは３〜４０重量％、更に好ましくは、４〜３０重量％）配合することができる。２重量％未満では発色濃度が不十分であり、５０重量％を越えるとインキ流出性が低下し、筆記性が阻害される。 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.

・摩擦体
前記摩擦体６を構成する弾性材料は、弾性を有する合成樹脂（ゴム、エラストマー）が挙げられ、例えば、シリコーン樹脂、ＳＢＳ樹脂（スチレン−ブタジエン−スチレン共重合体）、ＳＥＢＳ樹脂（スチレン−エチレン−ブタジエン−スチレン共重合体）、フッ素系樹脂、クロロプレン樹脂、ニトリル樹脂、ポリエステル系樹脂、オレフィン系樹脂、エチレンプロピレンジエンゴム（ＥＰＤＭ）等が挙げられる。 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), and 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.

本発明は，太陽光等の光に晒されても、熱変色性インキが光劣化することを回避でき、しかも、高温環境下での長期の保管で熱変色性インキの水分が軸筒を透過することを抑止でき、熱変色性インキの筆跡の濃度低下を防止できる。 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.

＜第１の実施の形態＞
本発明の熱変色性筆記具の第１の実施の形態を図１乃至図４に示す。
本実施の形態の熱変色性筆記具１は、前軸３及び後軸４とからなる軸筒２と、前記軸筒２内に交換可能に収容され、内部に熱変色性インキ７５が収容されたレフィル７と、前記軸筒２のペン先７１側に着脱自在に装着されるキャップ５と、前記軸筒２の後端部に設けられる摩擦体６とからなる。 <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.

・軸筒
軸筒２は、前軸３と後軸４とが螺合により着脱自在に構成される。前記前軸３は、基材が金属からなる先口３１と、該先口３１の後端に固着される基材が金属または合成樹脂からなる筒状の前軸本体３２と、該前軸本体３２の後端に固着される基材が金属からなる筒状の接続筒３３とからなる。前記先口３１の前端には、前端孔３４が設けられ、該前端孔３４より外部にペン先７１が突出される。前記前軸３の後端の接続筒３３の外面には、雄ネジが形成される。 The shaft cylinder 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.

前記後軸４は、基材が金属からなる後軸４本体４１と、該後軸本体４１の後端に取り付けられる金属製または合成樹脂製の筒状の支持筒４２とからなる。前記後軸４の前端開口部内面には、雌ネジが形成される。前記雌ネジは、前記前軸３の後端に固着された接続筒３３の外面の雄ネジと着脱自在に螺合される。 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.

・摩擦体
前記後軸４の後端に固着された支持筒４２の後端に、弾性材料よりなる摩擦体６が固着される。具体的には、支持筒４２の後端開口部に、弾性材料よりなる摩擦体６が嵌入により固着される。前記摩擦体６により、熱変色性インキ７５による筆跡を摩擦し、その際に生じる摩擦熱で該筆跡が熱変色可能である。尚、前記摩擦体６及び支持筒４２を後軸４（軸筒２）に対して着脱自在に設けてもよい。 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).

・キャップ
キャップ５は、基材が金属からなるキャップ本体５１と、該キャップ本体５１内に収容される合成樹脂製の内キャップ５２と、該内キャップ５２内に収容される弾性材料よりなるペン先シール部材５３と、内キャップ５２の頂部とキャップ本体５１の頂部と連結する、基材が金属からなる頭冠５４と、キャップ本体５１の外面に設けられる、基材が金属からなるクリップ５５とからなる。 The cap cap 5 includes a cap body 51 made of a metal base material, 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.

前記内キャップ５２の内面が、前軸３の外面及び後軸４の外面に嵌合可能である。前記ペン先シール部材５３は、キャップ５を軸筒２のペン先７１側に装着した際、ペン先７１前端と密接し、該ペン先７１を密封する。前記頭冠５４は、キャップ本体５１の頂部に固着される。 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.

・レフィル
前記レフィル７は、ペン先７１と、該ペン先７１の後端部を保持する合成樹脂製のホルダー７２と、該ホルダー７２が前端部に固着される合成樹脂製のインキ収容管７３と、該インキ収容管７３の後端部に固着される合成樹脂製の尾栓７４とからなる。 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.

前記ペン先７１は、前端にボールを回転可能に抱持した、基材が金属からなるチップ本体（ボールペンチップ）よりなる。前記ペン先７１、ホルダー７２、及びインキ収容管７３の内部（即ちインキ収容部）には、水性ゲルからなる熱変色性インキ７５と、該熱変色性インキ７５の後端に配置され、熱変色性インキ７５の消費により前進する高粘度流体からなる追従体７６とが充填される。 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.

前記尾栓７４には通気孔７４ａが貫設される。さらに、前記尾栓７４の後端部には、径方向に弾性変形可能な複数の弾性脚片７４ｂが形成される。前記弾性脚片７４ｂの相互間には、前記通気孔７４ａと連通する切り欠き状の通気溝が形成される。前記弾性脚片７４ｂが、後軸４の後端の支持筒４２（即ち支持筒４２の前端）に圧接される。 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).

前記チップ本体内にスプリングが収容される。前記スプリングにより、ボールが前方に押圧され、ボールが内向きの前端縁部に密接される。 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.

・作用
本実施の形態の熱変色性筆記具１は、少なくともキャップ５をペン先７１側に装着した状態において、ペン先７１がペン先シール部材５３により密封されるとともに、基材が金属からなるキャップ本体５１、基材が金属からなる接続筒３３、及び基材が金属からなる後軸本体４１により、軸筒２の内部に収容されたレフィル７が外部より完全に視認不能に隠蔽される。それにより、本実施の形態の熱変色性筆記具１は、非使用時（保管時）、キャップ５を前軸３に装着することによって、熱変色性インキ７５の光劣化を防止できるとともに、高温環境下での長期の保管で熱変色性インキ７５の水分が軸筒２及びキャップ５を透過することを十分に防止できる。 In the thermochromic writing instrument 1 according to the present embodiment, the pen tip 71 is sealed by the pen tip seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the pen tip 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.

本実施の形態の熱変色性筆記具１は、後軸４の後端に摩擦体６を設けたことにより、キャップ５をペン先７１側に装着した状態及びキャップ５を軸筒２から取り外した状態で、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦することができる。また、本実施の形態の熱変色性筆記具１は、軸筒２（少なくとも後軸本体４１）及びキャップ５（少なくともキャップ本体５１）が金属材料からなるため、透光性且つガス透過性を有する材料に比べ、筆記具全体の高重量を得ることができ、それにより、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦する際、筆跡に加える力を軽減でき、手に与える疲労感を緩和できる。 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.

本実施の形態の熱変色性筆記具１の全重量は、１２グラム〜４０グラムの範囲に設定される。それにより、熱変色性インキ７５の筆跡を摩擦する際の筆跡に加える力を軽減でき、手に与える疲労感を緩和できるとともに、筆記時の熱変色性筆記具１の動きを阻害するおそれがない。 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.

＜第２の実施の形態＞
本発明の熱変色性筆記具１の第２の実施の形態を図５乃至図８に示す。
本実施の形態の熱変色性筆記具１は、前軸３及び後軸４とからなる軸筒２と、前記軸筒２内に交換可能に収容され、内部に熱変色性インキ７５が収容されたレフィル７と、前記軸筒２のペン先７１側に着脱自在に装着されるキャップ５と、前記キャップ５の頂部に設けられる摩擦体６とからなる。 <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.

・軸筒
軸筒２は、前軸３と後軸４とが螺合により着脱自在に構成される。前記前軸３は、基材が金属からなる先口３１と、該先口３１の後端に固着される金属製または合成樹脂の筒状の前軸本体３２と、該前軸本体３２の後端に固着される基材が金属からなる筒状の接続筒３３からなる。前記先口３１の前端には、前端孔３４が設けられ、該前端孔３４より外部にペン先７１が突出される。前記前軸３の後端の接続筒３３の外面には、雄ネジが形成される。 The shaft cylinder 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.

前記後軸４は、基材が金属からなる後軸本体４１と、該後軸本体４１の後端に取り付けられる金属製または合成樹脂製の筒状の支持筒４２とからなる。前記後軸４の前端開口部内面には、雌ネジが形成される。前記雌ネジは、前記前軸３の後端に固着された接続筒３３の外面の雄ネジと着脱自在に螺合される。 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.

・キャップ
キャップ５は、基材が金属からなるキャップ本体５１と、前記キャップ本体５１内に一端が収容され且つ他端がキャップ本体５１頂部より外部に突出する合成樹脂製の内キャップ５２と、前記内キャップ５２内に収容される弾性材料よりなるペン先シール部材５３と、前記キャップ本体５１の外面に設けられる、基材が金属からなるクリップ５５とからなる。 The cap cap 5 includes a cap body 51 made of metal as a base material, 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.

・摩擦体
前記内キャップ５２の頂部には、弾性材料よりなる摩擦体６が固着される。具体的には、前記内キャップ５２の頂部の開口部に、弾性材料よりなる摩擦体６が嵌入により固着される。前記摩擦体６により、熱変色性インキ７５による筆跡を摩擦し、その際に生じる摩擦熱で該筆跡が熱変色可能である。 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.

前記ペン先７１は、前端にボールを回転可能に抱持した基材が金属からなるチップ本体（ボールペンチップ）よりなる。前記ペン先７１、ホルダー７２、及びインキ収容管７３の内部（即ちインキ収容部）には、水性ゲルからなる熱変色性インキ７５と、該熱変色性インキ７５の後端に配置され、熱変色性インキ７５の消費により前進する高粘度流体からなる追従体７６とが充填される。 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.

前記ペン先７１内部には、チップ本体内にスプリングが収容される。前記スプリングにより、ボールが前方に押圧され、ボールが内向きの前端縁部に密接される。 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.

本実施の形態の熱変色性筆記具１は、キャップ５の頂部に摩擦体６を設けたことにより、キャップ５をペン先７１側に装着した状態及びキャップ５を軸筒２の後端部に装着した状態で、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦することができる。また、本実施の形態の熱変色性筆記具１は、軸筒２（少なくとも後軸本体４１）及びキャップ５（少なくともキャップ本体５１）が金属材料からなるため、透光性且つガス透過性を有する材料に比べ、筆記具全体の高重量を得ることができ、それにより、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦する際、筆跡に加える力を軽減でき、手に与える疲労感を緩和できる。 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.

＜第３の実施の形態＞
本発明の熱変色性筆記具１の第３の実施の形態（本発明の熱変色性筆記具用レフィル７の実施の形態）を図９乃至図１２に示す。
本実施の形態の熱変色性筆記具１は、前軸３及び後軸４とからなる軸筒２と、前記軸筒２内に交換可能に収容され、内部に熱変色性インキ７５が収容されたレフィル７と、前記軸筒２のペン先７１側に着脱自在に装着されるキャップ５と、前記軸筒２の後端部に設けられる摩擦体６とからなる。 <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.

・軸筒
軸筒２は、前軸３と後軸４とが螺合により着脱自在に構成される。前記前軸３は、基材が金属からなる先口３１と、該先口３１の後端に固着される基材が金属または合成樹脂からなる筒状の前軸本体３２と、該前軸本体３２の後端に固着される基材が金属からなる筒状の接続筒３３からなる。前記先口３１の前端には、前端孔３４が設けられ、該前端孔３４より外部にペン先７１が突出される。前記前軸３の後端の接続筒３３の外面には、雄ネジが形成される。 The shaft cylinder 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.

・キャップ
キャップ５は、基材が金属からなるキャップ本体５１と、該キャップ本体５１内に収容される合成樹脂製の内キャップ５２と、該内キャップ５２内に収容される弾性材料よりなるペン先シール部材５３と、内キャップ５２の頂部とキャップ本体５１の頂部と連結する基材が金属からなる頭冠５４と、キャップ本体５１の外面に設けられる、基材が金属からなるクリップ５５とからなる。 The cap cap 5 includes a cap body 51 made of a metal base material, 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. .

・レフィル
本実施の形態の熱変色性筆記具用レフィル７は、ペン先７１と、該ペン先７１の後端部を保持する合成樹脂製のホルダー７２と、該ホルダー７２が前端部に固着される基材が金属からなるインキ収容管７３と、該インキ収容管７３の後端部に固着される合成樹脂製の尾栓７４とからなる。 Refill A thermochromic writing instrument refill 7 according to 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 is 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.

前記ペン先７１は、前端にボールを回転可能に抱持した基材が金属からなるチップ本体（ボールペンチップ）よりなる。前記ペン先７１、ホルダー７２、及びインキ収容管７３の内部には、水性ゲルからなる熱変色性インキ７５と、該熱変色性インキ７５の後端に配置され、熱変色性インキ７５の消費により前進する高粘度流体からなる追従体７６とが充填される。 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.

前記尾栓７４には通気孔７４ａが貫設される。さらに、前記尾栓７４の後端部には、径方向に弾性変形可能な複数の弾性脚片７４ｂが形成される。前記弾性脚片７４ｂの相互間には、前記通気孔７４ａと連通する切り欠き状の通気溝が形成される。前記弾性脚片７４ｂが、後軸４の後端の支持筒４２（支持筒４２の前端）に圧接される。 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).

・作用
本実施の形態の熱変色性筆記具１は、少なくともキャップ５をペン先７１側に装着した状態において、ペン先７１がペン先シール部材５３により密封されるとともに、基材が金属からなるキャップ本体５１、基材が金属からなる接続筒３３、及び基材が金属からなる後軸本体４１により、軸筒２の内部に収容されたレフィル７が外部より完全に視認不能に隠蔽される。さらに、本実施の形態の熱変色性筆記具１は、レフィル７のインキ収容部（即ち少なくともインキ収容管７３）を金属により形成した。それにより、本実施の形態の熱変色性筆記具１は、非使用時（保管時）、キャップ５を前軸３に装着することによって、熱変色性インキ７５の光劣化を防止できるとともに、高温環境下での長期の保管で熱変色性インキ７５の水分が、インキ収容部、軸筒２及びキャップ５を透過することを十分に防止できる。 In the thermochromic writing instrument 1 according to the present embodiment, the pen tip 71 is sealed by the pen tip seal member 53 and the base is made of metal in a state where at least the cap 5 is mounted on the pen tip 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.

本実施の形態の熱変色性筆記具１は、後軸４の後端に摩擦体６を設けたことにより、キャップ５をペン先７１側に装着した状態及びキャップ５を軸筒２から取り外した状態で、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦することができる。また、本実施の形態の熱変色性筆記具１は、軸筒２（少なくとも後軸本体４１）、キャップ５（少なくともキャップ本体５１）、レフィル７のインキ収容部（少なくともインキ収容管７３）が金属材料からなるため、透光性且つガス透過性を有する材料に比べ、筆記具全体の高重量を得ることができ、それにより、摩擦体６を使用して熱変色性インキ７５の筆跡を摩擦する際、筆跡に加える力を軽減でき、手に与える疲労感を緩和できる。 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.

本実施の形態の熱変色性筆記具用レフィル７は、レフィル７のインキ収容部（少なくともインキ収容管７３）が金属材料からなることにより、軸筒２内に収容された状態において、太陽光等の光に晒されても、熱変色性インキ７５が光劣化することを回避でき、しかも、高温環境下での長期の保管で熱変色性インキ７５の水分がレフィル７のインキ収容部を透過することを抑止でき、熱変色性インキ７５の筆跡の濃度低下を防止できる。 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.

本発明の第１の実施の形態におけるキャップをペン先側に装着した状態を示す縦断面図である。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. 図１のキャップを取り外した状態の軸筒を示す縦断面図である。It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. 図１のキャップを示す縦断面図である。It is a longitudinal cross-sectional view which shows the cap of FIG. 図１のレフィルを示す縦断面図である。It is a longitudinal cross-sectional view which shows the refill of FIG. 本発明の第２の実施の形態におけるキャップをペン先側に装着した状態を示す縦断面図である。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. 図５のキャップを取り外した状態の軸筒を示す縦断面図である。It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. 図５のキャップを示す縦断面図である。It is a longitudinal cross-sectional view which shows the cap of FIG. 図５のレフィルを示す縦断面図である。It is a longitudinal cross-sectional view which shows the refill of FIG. 本発明の第３の実施の形態におけるキャップをペン先側に装着した状態を示す縦断面図である。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. 図９のキャップを取り外した状態の軸筒を示す縦断面図である。It is a longitudinal cross-sectional view which shows the axial cylinder of the state which removed the cap of FIG. 図９のキャップを示す縦断面図である。It is a longitudinal cross-sectional view which shows the cap of FIG. 図９のレフィルを示す縦断面図である。It is a longitudinal cross-sectional view which shows the refill of FIG. 熱変色性インキの変色挙動を示す説明図である。It is explanatory drawing which shows the color change behavior of a thermochromic ink.

Explanation of symbols

１熱変色性筆記具
２軸筒
３前軸
３１先口
３２前軸本体
３３接続筒
３４前端孔
４後軸
４１後軸本体
４２支持筒
５キャップ
５１キャップ本体
５２内キャップ
５３ペン先シール部材
５４頭冠
５５クリップ
６摩擦体
７レフィル
７１ペン先
７２ホルダー
７３インキ収容管
７４尾栓
７４ａ通気孔
７４ｂ弾性脚片
７５熱変色性インキ
７６追従体 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

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 metal material, and rubs the handwriting of the thermochromic ink to produce frictional heat generated at that time. A thermal discoloration characterized in that a friction body capable of thermal discoloration of handwriting is provided at a rear end portion of the shaft tube, and the friction body is provided on a support tube detachable from the rear end portion of the shaft tube. Sex writing instrument.

The barrel has a shaft before having a front end hole in which the nib is projected consists of a shaft after being freely screwed detachably with said front shaft, said rear shaft is light-blocking property and gas-impermeable The front shaft is made of a light-transmitting and gas-permeable material, and a cap made of a light-shielding and gas-impermeable metal material that seals the pen tip is detachably provided on the front shaft. The thermochromic writing instrument according to claim 1 .

The thermochromic writing instrument according to claim 1 or 2, wherein the weight of the entire writing instrument is set in a range of 12 to 40 grams.

The refill ink storage portion is made of a light-shielding and gas-impermeable material, and a synthetic resin tail plug is fixed to the rear end portion of the ink storage portion, and the rear end portion of the tail plug is radially arranged. The thermochromic writing instrument according to any one of claims 1 to 3, further comprising a plurality of elastic leg pieces that can be elastically deformed.