JP5265169B2

JP5265169B2 - Friction body

Info

Publication number: JP5265169B2
Application number: JP2007264178A
Authority: JP
Inventors: 伸雄関根
Original assignee: Pilot Ink Co Ltd
Current assignee: Pilot Ink Co Ltd
Priority date: 2007-10-10
Filing date: 2007-10-10
Publication date: 2013-08-14
Anticipated expiration: 2027-10-10
Also published as: JP2009090566A

Description

本発明は、摩擦体に関する。詳細には、被筆記面（例えば紙面）上の熱変色性インキ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の筆跡を熱変色可能な摩擦体に関する。 The present invention relates to a friction body. More specifically, the present invention relates to a friction body capable of rubbing the handwriting of a thermochromic ink on a writing surface (for example, paper) and thermally discoloring the handwriting of the thermochromic ink with frictional heat generated at that time.

従来、特許文献１には、熱変色性インキによる筆跡を摩擦熱で熱変色させるための摩擦体において、摩擦体の形状を凸曲面とすることが記載され、さらに、前記凸曲面とすることにより、筆跡との接触角度によらず一定の接触面積が得られることが記載されている。 Conventionally, Patent Document 1 describes that in a friction body for thermally discoloring handwriting by thermochromic ink with frictional heat, the shape of the friction body is a convex curved surface. It is described that a constant contact area can be obtained regardless of the contact angle with the handwriting.

特開２００４−１４８７４４号公報JP 2004-148744 A

前記従来の凸曲面状の摩擦体は、摩擦体と筆跡との接触面積（即ち摩擦体と被筆記面との接触面積）が接触角度によらず一定である。そのため、熱変色性インキの筆跡の小面積を熱変色させたい場合や、熱変色性インキの筆跡の大面積を熱変色させたい場合、所望する熱変色面積に適した大きさの接触面積を得ることができないおそれがある。例えば、熱変色性インキの筆跡の小面積を熱変色させたい場合、前記従来の摩擦体では、熱変色性インキの筆跡の熱変色させたくない部分を熱変色させてしまうおそれがあり、一方、熱変色性インキの筆跡の大面積を熱変色させたい場合、前記従来の摩擦体では多大な摩擦回数を必要とする。 In the conventional convex curved friction body, the contact area between the friction body and the handwriting (that is, the contact area between the friction body and the writing surface) is constant regardless of the contact angle. Therefore, when you want to change the color of a small area of the handwriting of thermochromic ink or to change the color of a large area of the handwriting of thermochromic ink, obtain a contact area with a size suitable for the desired thermochromic area. There is a risk that it will not be possible. For example, when it is desired to thermally discolor a small area of the handwriting of the thermochromic ink, in the conventional friction body, there is a possibility that the portion of the thermochromic ink that is not desired to be thermally discolored may be thermally discolored, When it is desired to thermally discolor a large area of the handwriting of the thermochromic ink, the conventional friction body requires a large number of frictions.

本発明は、前記従来の問題点を解決するものであって、所望する熱変色面積に適した大きさの摩擦面積を容易に得ることができる摩擦体を提供しようとするものである。 The present invention is intended to solve the above-mentioned conventional problems, and to provide a friction body that can easily obtain a friction area having a size suitable for a desired thermochromic area.

本願の第１の発明は、被筆記面上の熱変色性インキ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の筆跡を熱変色可能な摩擦体であって、非球面状の表面を有する弾性材料からなる摩擦部２を備え、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が非円形状であること（請求項１）を要件とする。（図１乃至図１２参照） A first invention of the present application is a friction body capable of thermally changing the handwriting of the thermochromic ink by frictional heat generated by rubbing the handwriting of the thermochromic ink on the writing surface, and having an aspherical shape. The friction part 2 made of an elastic material having a surface of the surface is provided, and the shape of the contact part when the friction part 2 is brought into contact with a flat writing surface is a non-circular shape (Claim 1). . (See FIGS. 1 to 12)

前記第１の発明の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が非円形状であることにより、少なくとも、接触部分の形状が短径と長径を有する。それにより、熱変色性インキの筆跡の小面積を熱変色させたい場合には、接触部分の形状の長径方向ａに摩擦体１を移動させることによって、比較的小さい摩擦面積（即ち細幅の熱変色跡）を容易に得ることができ、一方、熱変色性インキの筆跡の大面積を熱変色させたい場合には、接触部分の形状の短径方向ｂに移動させることによって、少ない摩擦回数で比較的大きい摩擦面積（即ち太幅の熱変色跡）を容易に得ることができる。即ち、前記第１の発明の摩擦体１は、被筆記面に接触させたときの移動させる方向を選択することにより、所望する熱変色面積に応じた最適な摩擦面積を容易に得ることができる。 In the friction body 1 of the first invention, the shape of the contact portion when the friction portion 2 is brought into contact with the planar writing surface is noncircular, so that at least the shape of the contact portion has a short diameter. Has a major axis. Accordingly, when a small area of the handwriting of the thermochromic ink is desired to be thermally discolored, by moving the friction body 1 in the major axis direction a of the shape of the contact portion, a relatively small friction area (that is, a narrow thermal area) is obtained. When the large area of the handwriting of the thermochromic ink is desired to be thermally discolored, the number of frictions can be reduced by moving the contact portion in the minor axis direction b. A relatively large friction area (that is, a thermal discoloration mark having a large width) can be easily obtained. That is, the friction body 1 according to the first aspect of the invention can easily obtain an optimum friction area corresponding to a desired thermal discoloration area by selecting a direction to be moved when it is brought into contact with the writing surface. .

本願の第２の発明は、前記第１の発明において、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が細長状であること（請求項２）を要件とする。（図１乃至図１２参照） The second invention of the present application is that, in the first invention, the shape of the contact portion when the friction portion 2 is brought into contact with the planar writing surface is elongated (Claim 2). . (See FIGS. 1 to 12)

前記第２の発明の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が細長状であることにより、摩擦部２の短径と長径を外部より容易に視認することができる。それにより、摩擦変色時、摩擦体１の摩擦部２の向きを所望する摩擦面積に応じて、迅速に選択できる。尚、前記細長状の形状とは、例えば、楕円形状、長円形状、長方形形状、帯状、線状等が挙げられる。 In the friction body 1 according to the second aspect of the invention, the shape of the contact portion when the friction portion 2 is brought into contact with the planar writing surface is elongated, so that the minor axis and the major axis of the friction portion 2 are externally provided. It can be easily visually recognized. Thereby, at the time of friction discoloration, the direction of the friction part 2 of the friction body 1 can be quickly selected according to the desired friction area. Examples of the elongated shape include an elliptical shape, an oval shape, a rectangular shape, a strip shape, and a linear shape.

本願の第３の発明は、前記第２の発明において、摩擦部２の長径方向ａの縦断面において摩擦部２の頂部が凸曲面２ａを有し、摩擦部２の短径方向ｂの縦断面において摩擦部２の頂部が凸曲面２ｂを有し、長径方向の縦断面における凸曲面２ａの曲率半径Ｒ１と短径方向ｂの縦断面における凸曲面２ｂの曲率半径Ｒ２とが異なること（請求項３）を要件とする。（図１乃至図４参照） According to a third invention of the present application, in the second invention, the top of the friction part 2 has a convex curved surface 2a in the longitudinal section of the friction part 2 in the major axis direction a, and the longitudinal section of the friction part 2 in the minor axis direction b. The top of the friction part 2 has a convex curved surface 2b, and the curvature radius R1 of the convex curved surface 2a in the longitudinal section in the major axis direction is different from the curvature radius R2 of the convex curved surface 2b in the longitudinal section in the minor axis direction b. 3) is a requirement. (See FIGS. 1 to 4)

前記第３の発明の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状を細長状にできる摩擦部２を容易に得るとともに、長径方向ａ及び短径方向ｂのいずれに移動させても引っ掛かりのない滑らかな摩擦作動が可能となる。尚、前記摩擦部２の長径方向ａの縦断面とは、摩擦部２を長径方向ａに切断した縦断面をいう。前記摩擦部２の短径方向ｂの縦断面とは、摩擦部２を短径方向ｂに切断した縦断面をいう。 The friction body 1 according to the third aspect of the present invention easily obtains the friction portion 2 that can make the contact portion elongated when the friction portion 2 is brought into contact with the planar writing surface, and has a major axis direction a and a short portion. Smooth frictional operation without catching becomes possible regardless of movement in any of the radial directions b. The longitudinal section in the major axis direction a of the friction part 2 refers to a longitudinal section obtained by cutting the friction part 2 in the major axis direction a. The longitudinal section in the minor axis direction b of the friction part 2 refers to a longitudinal section obtained by cutting the friction part 2 in the minor axis direction b.

本願の第４の発明は、前記第２の発明において、摩擦部２の長径方向ａの縦断面または短径方向ｂの縦断面において、摩擦部１の頂部が直線状の稜線部２ｃを備え、前記稜線部２ｃの少なくとも一端に角部２ｄを有すること（請求項４）を要件とする。（図５乃至図１２参照） According to a fourth aspect of the present invention, in the second aspect, in the longitudinal section in the major axis direction a or the longitudinal section in the minor axis direction b of the friction section 2, the top of the friction section 1 includes a linear ridge line section 2c. It is a requirement that the corner portion 2d is provided at least at one end of the ridge line portion 2c. (See FIGS. 5 to 12)

前記第４の発明の摩擦体１は、摩擦変色時、摩擦部２の角部２ｄを用いることにより、被筆記面との接触面積を極めて小さくでき、その結果、摩擦変色時の摩擦部２に加える押圧力を小さくしても熱変色性インキの筆跡を十分に熱変色させることができ、しかも、熱変色性インキの筆跡の極めて細かい部分の熱変色が可能となる。前記角部２ｄの角度は、直角、鋭角、鈍角のいずれであてもよいが、具体的には１０度〜１６０度（好ましくは２０度〜１４０度）が好ましい。尚、前記摩擦部２の長径方向ａの縦断面とは、摩擦部２を長径方向ａに切断した縦断面をいう。前記摩擦部２の短径方向ｂの縦断面とは、摩擦部２を短径方向ｂに切断した縦断面をいう。 The friction body 1 according to the fourth aspect of the present invention can extremely reduce the contact area with the writing surface by using the corner portion 2d of the friction portion 2 at the time of friction discoloration. Even if the pressing force applied is reduced, the handwriting of the thermochromic ink can be sufficiently discolored, and furthermore, the heat discoloration of a very fine portion of the handwriting of the thermochromic ink can be performed. The angle of the corner 2d may be any of a right angle, an acute angle, and an obtuse angle. Specifically, the angle is preferably 10 degrees to 160 degrees (preferably 20 degrees to 140 degrees). The longitudinal section in the major axis direction a of the friction part 2 refers to a longitudinal section obtained by cutting the friction part 2 in the major axis direction a. The longitudinal section in the minor axis direction b of the friction part 2 refers to a longitudinal section obtained by cutting the friction part 2 in the minor axis direction b.

・摩擦体
尚、本発明で、摩擦体の摩擦部を構成する弾性材料（または摩擦体を構成する弾性材料）は、弾性を有する樹脂（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、エチレンプロピレンジエンゴム（ＥＰＤＭ）等が挙げられる。前記摩擦体の摩擦部を構成する弾性材料（または摩擦体を構成する弾性材料）は、高摩耗性の弾性材料（例えば、消しゴム等）からなるものよりも、摩擦時に消しカスが生じない低摩耗性の弾性材料からなることが好ましい。 -Friction body In the present invention, the elastic material constituting the friction part of the friction body (or the elastic material constituting the friction body) includes an elastic resin (rubber, elastomer), for example, silicone resin, SBS Resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene-ethylene-butadiene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM), etc. Can be mentioned. The elastic material constituting the friction part of the frictional body (or the elastic material constituting the frictional body) is lower in wear so that no debris is generated at the time of friction than that made of a highly wearable elastic material (for example, an eraser). It is preferable that it consists of an elastic material.

前記摩擦体の適用例としては、熱変色性インキを内蔵し且つ熱変色性インキを吐出可能なペン先を備えた筆記具の一部（例えば、筆記具本体の端部、またはキャップの端部）に取り付けられてもよいし、直接把持可能な大きさの単体であってもよいし、または把持可能なホルダーに取り付けられてもよい。 As an application example of the friction body, a part of a writing instrument (for example, an end portion of a writing instrument body or an end portion of a cap) that includes a thermochromic ink and has a pen tip capable of discharging the thermochromic ink is used. It may be attached, may be a single piece of a size that can be directly gripped, or may be attached to a holder that can be gripped.

・熱変色性インキ
尚、本発明において、前記熱変色性インキは、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 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。 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)].

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 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部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 discoloration temperature of the thermochromic ink due to frictional heat of the friction part 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 part.

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以下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 0.5 μm or less, it is difficult to show high density color development. .

前記可逆熱変色性マイクロカプセル顔料は、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充分であり、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 can be blended in an amount of 2 to 50% by weight (preferably 3 to 40% by weight, more preferably 4 to 30% by weight) based on the total amount of the ink composition. If it is less than 2% by weight, the color density is insufficient, and if it exceeds 50% by weight, the ink outflow is reduced and the writing property is impaired.

本発明の摩擦体は、所望する熱変色面積に適した大きさの摩擦面積を容易に得ることができる。 The friction body of the present invention can easily obtain a friction area having a size suitable for a desired thermal discoloration area.

＜第１の実施の形態＞
本発明の第１の実施の形態を図１乃至図４に示す。
本実施の形態の摩擦体１は、弾性材料（例えば、ＳＥＢＳ樹脂、ＳＢＳ樹脂）により構成され、直方体状の本体の一端に、表面が非球面状の凸曲面からなる摩擦部２が形成される。 <First Embodiment>
A first embodiment of the present invention is shown in FIGS.
The friction body 1 of the present embodiment is made of an elastic material (for example, SEBS resin, SBS resin), and a friction portion 2 having a convex curved surface with an aspheric surface is formed at one end of a rectangular parallelepiped body. .

前記摩擦部２は、長径方向ａの縦断面において頂部が凸曲面２ａを有するとともに、短径方向ｂの縦断面において頂部が凸曲面２ｂを有する。前記長径方向ａの縦断面における凸曲面２ａの曲率半径Ｒ１が、前記短径方向ｂの縦断面における凸曲面２ｂの曲率半径Ｒ２よりも大きく設定される。（図２、図３参照） The friction part 2 has a convex surface 2a at the top in the longitudinal section in the major axis direction a, and has a convex surface 2b at the top in the longitudinal section in the minor axis direction b. A curvature radius R1 of the convex curved surface 2a in the longitudinal section in the major axis direction a is set larger than a curvature radius R2 of the convex curve 2b in the longitudinal section in the minor axis direction b. (See Figs. 2 and 3)

本実施の形態において、摩擦体１の摩擦部２の頂部を平面状の被筆記面に一定の荷重で接触させたとき、摩擦部２が弾性変形し、その接触部分の形状は、図４に示すように、楕円形状または長円形状となる。 In the present embodiment, when the top of the friction part 2 of the friction body 1 is brought into contact with a flat writing surface with a constant load, the friction part 2 is elastically deformed, and the shape of the contact part is shown in FIG. As shown, it is elliptical or oval.

本実施の形態の摩擦体１は、熱変色性インキの筆跡の小面積を熱変色させたい場合には、接触部分の形状の長径方向ａに摩擦体１を移動させることによって、比較的小さい摩擦面積（即ち細幅の熱変色跡）を容易に得ることができ、一方、熱変色性インキの筆跡の大面積を熱変色させたい場合には、接触部分の形状の短径方向ｂに移動させることによって、少ない摩擦回数で比較的大きい摩擦面積（即ち太幅の熱変色跡）を容易に得ることができる。 The friction body 1 according to the present embodiment has a relatively small friction by moving the friction body 1 in the major axis direction a of the shape of the contact portion when a small area of the handwriting of the thermochromic ink is desired to be discolored. The area (that is, the narrow color change mark) can be easily obtained. On the other hand, when a large area of the thermochromic ink is desired to be changed in color, it is moved in the minor axis direction b of the shape of the contact portion. As a result, a relatively large friction area (that is, a wide thermal discoloration mark) can be easily obtained with a small number of frictions.

本実施の形態の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が楕円形状または長円形状（細長状）であることにより、摩擦部２の短径と長径を外部より容易に視認することができる。それにより、摩擦変色時、摩擦体１の摩擦部２の向きを所望する摩擦面積に応じて、迅速に選択できる。 In the friction body 1 of the present embodiment, the shape of the contact portion when the friction portion 2 is brought into contact with the planar writing surface is an elliptical shape or an oval shape (elongated shape). The short diameter and the long diameter can be easily visually recognized from the outside. Thereby, at the time of friction discoloration, the direction of the friction part 2 of the friction body 1 can be quickly selected according to the desired friction area.

本実施の形態の摩擦体１は、摩擦部２の長径方向の縦断面ａにおいて摩擦部２の頂部が凸曲面２ａを有し、摩擦部２の短径方向の縦断面ｂにおいて摩擦部２の頂部が凸曲面２ｂを有し、長径方向の縦断面における凸曲面２ａの曲率半径Ｒ１と短径方向ｂの縦断面における凸曲面２ｂの曲率半径Ｒ２とが異なることにより、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状を細長状にできる摩擦部２を容易に得るとともに、長径方向ａ及び短径方向ｂのいずれに移動させても引っ掛かりのない滑らかな摩擦作動が可能となる。 In the friction body 1 of the present embodiment, the top of the friction part 2 has a convex curved surface 2 a in the longitudinal section a of the friction part 2 in the major axis direction, and the friction part 2 has a convex section 2 a in the minor section of the friction part 2 in the minor axis direction. The top portion has a convex curved surface 2b, and the curvature radius R1 of the convex curved surface 2a in the longitudinal section in the major axis direction is different from the curvature radius R2 of the convex curved surface 2b in the longitudinal section in the minor axis direction b. The friction part 2 that can make the shape of the contact part slender when it is brought into contact with the writing surface is easily obtained, and smooth frictional operation without being caught even if it is moved in either the major axis direction a or the minor axis direction b Is possible.

＜第２の実施の形態＞
本発明の第２の実施の形態を図５乃至図８に示す。
本実施の形態の摩擦体１は、弾性材料（例えば、ＳＥＢＳ樹脂、ＳＢＳ樹脂）により構成され、直方体状の本体の一端に摩擦部２が形成される。 <Second Embodiment>
A second embodiment of the present invention is shown in FIGS.
The friction body 1 of the present embodiment is made of an elastic material (for example, SEBS resin, SBS resin), and the friction portion 2 is formed at one end of a rectangular parallelepiped main body.

前記摩擦部２は、長径方向ａの縦断面において直線状の稜線部２ｃ（頂部）を備え、前記稜線部２ｃの両端に角部２ｄを有する。前記角部２ｄの角度は略直角に設定される。（図６参照） The friction part 2 includes a linear ridge line part 2c (top) in a longitudinal section in the major axis direction a, and has corner parts 2d at both ends of the ridge line part 2c. The angle of the corner 2d is set to a substantially right angle. (See Figure 6)

また、前記摩擦部２は、短径方向ｂの縦断面において頂部が凸曲面２ｂを有する。（図７参照） Moreover, the friction part 2 has a convex surface 2b at the top in the longitudinal section in the minor axis direction b. (See Figure 7)

本実施の形態において、摩擦体１の摩擦部２の頂部（稜線部２ｃ）を平面状の被筆記面に一定の荷重で接触させたとき、摩擦部２が弾性変形し、その接触部分の形状は、図８に示すように、長方形状または帯状となる。 In this Embodiment, when the top part (ridgeline part 2c) of the friction part 2 of the friction body 1 is made to contact with a flat writing surface with a fixed load, the friction part 2 elastically deforms and the shape of the contact part is obtained. As shown in FIG. 8, it has a rectangular shape or a band shape.

本実施の形態の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が長方形状または帯状（細長状）であることにより、摩擦部２の短径と長径を外部より容易に視認することができる。それにより、摩擦変色時、摩擦体１の摩擦部２の向きを所望する摩擦面積に応じて、迅速に選択できる。 The friction body 1 of the present embodiment has a short diameter of the friction portion 2 when the shape of the contact portion when the friction portion 2 is brought into contact with the planar writing surface is rectangular or strip-shaped (elongated). And the major axis can be easily seen from the outside. Thereby, at the time of friction discoloration, the direction of the friction part 2 of the friction body 1 can be quickly selected according to the desired friction area.

本実施の形態の摩擦体１は、摩擦変色時、摩擦部２の角部２ｄを用いることにより、被筆記面との接触面積を極めて小さくでき、その結果、摩擦変色時の摩擦部２に加える押圧力を小さくしても熱変色性インキの筆跡を十分に熱変色させることができ、しかも、熱変色性インキの筆跡の極めて細かい部分の熱変色が可能となる。 The friction body 1 of the present embodiment can make the contact area with the writing surface extremely small by using the corner portion 2d of the friction portion 2 at the time of friction discoloration, and as a result, is added to the friction portion 2 at the time of friction discoloration. Even if the pressing force is reduced, the handwriting of the thermochromic ink can be sufficiently discolored, and furthermore, the heat discoloration of a very fine portion of the handwriting of the thermochromic ink can be performed.

＜第３の実施の形態＞
本発明の第３の実施の形態を図９乃至図１２に示す。
本実施の形態の摩擦体１は、弾性材料（例えば、ＳＥＢＳ樹脂、ＳＢＳ樹脂）により構成され、直方体状の本体の一端に摩擦部２が形成される。 <Third Embodiment>
A third embodiment of the present invention is shown in FIGS.
The friction body 1 of the present embodiment is made of an elastic material (for example, SEBS resin, SBS resin), and the friction portion 2 is formed at one end of a rectangular parallelepiped main body.

前記摩擦部２は、長径方向ａの縦断面において直線状の稜線部２ｃ（即ち頂部）を備え、前記稜線部２ｃの両端に角部２ｄを有する。前記角部２ｄの角度は略直角に設定される。（図１０参照） The friction part 2 includes a linear ridge line part 2c (that is, a top part) in a longitudinal section in the major axis direction a, and has corner parts 2d at both ends of the ridge line part 2c. The angle of the corner 2d is set to a substantially right angle. (See Figure 10)

また、前記摩擦部２は、短径方向ｂの縦断面において頂部に角部２ｅを有する。前記角部２ｅの角度は鋭角（例えば３０度〜８０度）に設定される。（図１１参照） The friction part 2 has a corner 2e at the top in the longitudinal section in the minor axis direction b. The angle of the corner 2e is set to an acute angle (for example, 30 to 80 degrees). (See Figure 11)

本実施の形態において、摩擦体１の摩擦部２の頂部（即ち稜線部２ｃ）を平面状の被筆記面に一定の荷重で接触させたとき、摩擦部２が弾性変形し、その接触部分の形状は、図１２に示すように、線状または帯状となる。 In the present embodiment, when the top portion (that is, the ridge portion 2c) of the friction portion 2 of the friction body 1 is brought into contact with the planar writing surface with a constant load, the friction portion 2 is elastically deformed, and the contact portion As shown in FIG. 12, the shape is a line or a band.

本実施の形態の摩擦体１は、摩擦部２を平面状の被筆記面に接触させたときの接触部分の形状が線状または帯状（細長状）であることにより、摩擦部２の短径と長径を外部より容易に視認することができる。それにより、摩擦変色時、摩擦体１の摩擦部２の向きを所望する摩擦面積に応じて、迅速に選択できる。 In the friction body 1 of the present embodiment, the contact portion when the friction portion 2 is brought into contact with the planar writing surface has a linear shape or a strip shape (elongated shape). And the major axis can be easily seen from the outside. Thereby, at the time of friction discoloration, the direction of the friction part 2 of the friction body 1 can be quickly selected according to the desired friction area.

本発明の摩擦体の第１実施の形態を示す要部斜視図である。It is a principal part perspective view which shows 1st Embodiment of the friction body of this invention. 図１のＸ−Ｘ線縦断面図（図１の長径方向の縦断面図）である。FIG. 2 is a longitudinal sectional view taken along line XX in FIG. 1 (longitudinal sectional view in the major axis direction of FIG. 1). 図１のＹ−Ｙ線縦断面図（図１の短径方向の縦断面図）である。FIG. 2 is a longitudinal sectional view taken along line YY of FIG. 1 (longitudinal sectional view in the minor axis direction of FIG. 1). 図１の摩擦体の摩擦部を被筆記面に接触させたときの接触部分の形状を示す図である。It is a figure which shows the shape of a contact part when the friction part of the friction body of FIG. 1 is made to contact a writing surface. 本発明の摩擦体の第２実施の形態を示す要部斜視図である。It is a principal part perspective view which shows 2nd Embodiment of the friction body of this invention. 図５の長径方向の縦断面図である。It is a longitudinal cross-sectional view of the major axis direction of FIG. 図５の短径方向の縦断面図である。It is a longitudinal cross-sectional view of the minor axis direction of FIG. 図５の摩擦体の摩擦部を被筆記面に接触させたときの接触部分の形状を示す図である。It is a figure which shows the shape of a contact part when the friction part of the friction body of FIG. 5 is made to contact a writing surface. 本発明の摩擦体の第３実施の形態を示す要部斜視図である。It is a principal part perspective view which shows 3rd Embodiment of the friction body of this invention. 図９の長径方向の縦断面図である。It is a longitudinal cross-sectional view of the major axis direction of FIG. 図９の短径方向の縦断面図である。It is a longitudinal cross-sectional view of the minor axis direction of FIG. 図９の摩擦体の摩擦部を被筆記面に接触させたときの接触部分の形状を示す図である。It is a figure which shows the shape of a contact part when the friction part of the friction body of FIG. 9 is made to contact a writing surface. 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摩擦体
２摩擦部
２ａ凸曲面
２ｂ凸曲面
２ｃ稜線部
２ｄ角部
２ｅ角部
ａ長径方向
ｂ短径方向 DESCRIPTION OF SYMBOLS 1 Friction body 2 Friction part 2a Convex curved surface 2b Convex curved surface 2c Edge line part 2d Corner | angular part 2e Corner | angular part a Major axis direction b Minor axis direction

Claims

A friction body capable of thermally changing the handwriting of the thermochromic ink by rubbing heat generated by rubbing the handwriting of the thermochromic ink on the writing surface,
A friction part made of an elastic material having an aspherical surface, the top of the friction part has a convex curved surface in the longitudinal section in the major axis direction of the friction part, and the top of the friction part in the longitudinal section in the minor axis direction of the friction part Has a convex curved surface, and the radius of curvature of the convex curved surface in the longitudinal section in the major axis direction is different from that of the convex curved surface in the longitudinal section in the minor axis direction, and the top of the friction part is elastically deformed into a flat writing surface. A frictional body characterized in that the shape of the contact portion when brought into contact with each other is non-circular and elongated .