TWI238123B - Ballpoint pen tip and ballpoint pen - Google Patents

Abstract

A ballpoint pen tip using a ball with a diameter smaller than 0.3 mm, in which an amount of ball-sinking is made to be as small as possible and ball-dropping is made to occur hardly. Either in a ballpoint pen tip 10 comprising a holder 20 with inward protrusions 22 formed by a plurality of adjacent positions to an end of a fine metal tube, every one of which locates at an equal distance from an end of a fine metal tube and is adjacent to the end, being so pressed and deformed inwardly that the inward protrusions 22 may have an inscribed circle with a diameter of F (mm), and a ball 30 with a diameter (D) smaller than 0.3 mm supported by the inward protrusions 22; or in a ballpoint pen tip comprising a ball house 23 formed by an inner space of an end of a columnar material being curved, an ink-inducting hole 27 formed to penetrate from another end of the columnar material to an adjacent position to the ball house 2, an ink-flowing hole 28 with a diameter of F (mm) formed to penetrate between the ball house 23 and the ink-inducting hole 21, and the ball 30 with a diameter (D) smaller than 0.3 mm inserted into the ball house 23; a following relationship is fulfilled; 0.4 <= F/D <= 0.6.

Description

1238123 发明 Description of the invention (The description of the invention should state: the technical field to which the invention belongs, the prior art, the content, the embodiments, and the drawings briefly) C. The technical field to which the invention belongs] The technical field to which the invention belongs The present invention relates to a Ballpoint pen tip and ballpoint pen, the ballpoint pen 5 tip is a small diameter ball with a ball diameter of less than 0.3mm, especially a ball with a ball diameter of 0.39mm or less, and the aforementioned ballpoint pen has a metal The shape of a ballpoint pen tip formed by a thin tube and the ballpoint pen tip, and the present invention relates to the shape of a ballpoint pen tip formed by cutting a cylindrical material. 10 [] Know-how There are various ballpoint pen tips for processing metal thin tubes into holders. Such a ballpoint pen nib uses the inner protrusion formed by pressing and deforming a plurality of places near the front end of the thin metal tube inward as a socket for the ball. 15 Then, insert the ball into the receiving seat, and press and deform the front end of the thin metal tube to form a convergent portion. And the support ball is surrounded by the receiving seat and the convergence portion so that it cannot be lifted off and can rotate freely. In addition, the material of the metal thin tube is generally SUS304 having a nickel content of 7 to 9% by weight. Furthermore, in order to improve the plastic workability 20 of the thin metal tube, an annealing treatment is performed to reduce the Vickers hardness to about 180 to 200, and then the holder is processed. In addition, conventionally, various cylindrical materials have been cut to be processed into ballpoint pen nibs. Such a ballpoint pen tip is formed by cutting the outer periphery of the cylindrical material near the front end of the cylindrical material into a thin tapered portion and cutting the inner periphery to form a ball chamber. In addition, 'the rear end of the cylindrical material is perforated to the vicinity of the bead chamber to form an ink guide hole, and a circulation hole is provided through the bottom surface of the bead chamber and the ink guide hole, and the circle is directed toward the rear end, such as radially. The bottom surface of the bead chamber is grooved to form an ink guide groove, and the remaining bottom surface is used as a receiving seat. Then, a bead is inserted into the bead chamber, and the front end of the tapered portion is pressed and deformed inward to form a convergent portion. That is, the supporting ball is surrounded by the receiving seat and the convergence portion so as not to fall off and can rotate freely. In addition, the tip of a ballpoint pen with a small diameter of less than 0e3mm and a ballpoint pen of 10 is used, especially when the ball diameter is less than 0.29mm. Once the diameter of the ball is reduced, the diameter of the ink guide hole connected to the ink circulation hole is also With the shrinkage of J, the ink cannot be smoothly supplied, and the phenomenon of blurred characters or broken lines occurs. In particular, ball-point pens using pseudoplastic water-based inks or low-viscosity oil-based inks that consider DC performance viscosity are clearly inclined. 15 Problems to be Solved by the Invention One of the characteristics that a ballpoint pen tip should avoid is the so-called "ball sinking". Here, the so-called ball subsidence refers to the fact that the socket gradually wears out due to the friction between the rotating ball and the socket, which is the phenomenon that the gap of the ball rotation increases. When the ball sinks severely, the gap between the ball and the opening at the front port edge of the holder increases. Therefore, the supply amount of ink increases, which is a cause of the so-called "ink leakage." Since the tip of a ball-point pen with a thin metal tube is used, the socket is formed by an inner protrusion as described in sodium, so the contact area with the ball is small. Therefore, the problem of bead sinking due to wear is very serious. 1238123 Rose and description of the invention In particular, the use of a ballpoint pen tip with a small-diameter ball having a ball diameter of less than 0.3mm, especially if the ball diameter is less than 0.29mm, the problem of ball sinking is prone to occur, and its countermeasures have become important issues. However, if the product of the contact surface 5 between the receiving seat and the ball in the receiving seat is simply increased, the deformation amount due to the pressing deformation of the inner protrusion has to be increased. Therefore, the bead chamber in the space for accommodating the beads is deformed, and the inner protrusion is easily broken. 10 15 In this regard, the first problem of the present invention is to reduce the problem of ball subsidence as much as possible by using the proper amount of deformation required to form the inner protrusions in the tip of a ball-point pen using a small-diameter ball. In addition, it is necessary for the ballpoint pen tip to minimize the friction between the tip of the ball and the paper surface during writing. In addition, "In order to prevent the ball from leaping from the front end of the holding seat ', it is necessary to ensure the holding of the coupling portion. When using a ballpoint pen tip with a small ball diameter of less than 0.3mm (especially a diameter of less than 29.29), the size of the projection protruding from the holder is smaller than that of a ball with a large diameter ball. During writing, the front end of the holding base is easy to contact the paper surface, so it is not easy to write, and there is a problem that the ball is detached due to the wear of the front end of the holding base. In addition, using a ballpoint pen tip with a small-diameter ball with a ball diameter smaller than Q.3mm (especially a diameter of less than 0 ^ 29mm), the inner diameter of the front port edge of the convergence portion is smaller than that of a large-diameter ball. Small, therefore, the holding force applied by the convergence portion has to be small. Therefore, the subject of the flute q _ of the present invention is to effectively prevent the ball from jumping off by using the tip of a ball-point pen with a small diameter to make the deformation amount required for the convergence portion ^ y appropriate. Furthermore, the third object of the present invention is to provide a ballpoint pen nib, and by using the ballpoint pen nib with a small diameter ball, the amount of deformation required for the formation of the inner protrusion is appropriate, and the formation of the convergence portion is required. The amount of deformation is just 5 to reduce the degree of sinking of the beads as much as possible and prevent the ball from falling off. As mentioned above, the hardness of the metal thin tube is reduced by annealing, so that the plastic workability of the metal thin tube is good. However, in the ballpoint pen tip using a small-diameter ball, the diameter of the holder is also reduced in accordance with it. Therefore, it is easy to cause bending due to a decrease in hardness, and the problem of sinking the ball is also easy to occur. However, in order to avoid a decrease in hardness, when the annealing step is omitted alone, cracks are liable to occur when the inner protrusions are formed due to poor plastic workability. That is, these disadvantages cannot be resolved without careful investigation of the material of the metal thin tube. 15 Therefore, the fourth problem of the present invention is to solve the problem of bending or ball sinking caused by the material of a thin metal tube in a ballpoint pen tip using a small diameter ball and holding the ball with an inner protrusion. Furthermore, the fifth subject of the present invention is to provide a ball-point pen which can realize a smooth writing feeling. The ball-point pen has a ball-point pen tip, and is formed by using a ball-point pen tip with a small diameter of 20 balls to form an inner protrusion. Those who need to be appropriate and appropriate, and make the amount of deformation required to form the convergence part is appropriate, and as far as possible to reduce the degree of ball subsidence and the ball is not easy to escape. In addition, the sixth subject of the present invention is to provide a ball-point pen, which is a book that realizes smoother use of limited-use ink in addition to the fifth subject described above. 1238123 发明, description of the invention. 5 10 In addition, a ballpoint pen tip manufactured to cut a cylindrical material has the aforementioned problems, and when the A ink guide hole is added, it may interfere with the portion of the holder. In order to avoid this problem, there is also a method of shortening the connection portion between the ink guide hole and the ink flow hole. However, the ink flow hole is relatively long, which hinders the supply of ink.

Further, in order to solve the aforementioned problem, there is a method of providing a tapered diameter reduction portion at the connection portion between the ink guide hole and the ink circulation hole. However, the angle of the outer cone of the conventional ballpoint pen tip is about 30 degrees, which makes the connection portion When the taper angle is increased, the layer thickness of @ 持 锋 部 is reduced. When the ink guide hole is formed by grooving, processing defects may occur due to the slackness of the thin layer portion. In addition, when the taper angle of the connecting portion is reduced, the distance between the ink guide hole and the ink circulation hole is necessarily increased, and therefore, the supply of ink is likely to be hindered, and the high-speed writing performance is not good.

The seventh subject of the present invention is to provide a ballpoint pen nib, which is used to solve the aforementioned problem, and even if it is a small-diameter ball with a ball diameter smaller than 0.3, especially a ballpoint pen tip with a diameter of 0 to 29mm, It also has excellent fast writing performance and is easy to process. In addition, for the ballpoint pen tip, one of the characteristics that should be avoided is the problem of “20 Mingyuan Balls”. Here, the so-called ball subsidence refers to the phenomenon that the socket gradually wears out due to the friction between the rotating ball and the socket, and the size of the ball protruding from the front end of the convergence portion decreases. When the ball sinks heavily, the ball will block the ink guide hole, prevent the ink from flowing out, and make writing impossible. When the size of the ball protrusion is reduced. When writing, the convergence part is easier than the ball. 10 1238123 发明, description of the invention Touch the paper surface, therefore, the smoothness of writing is impaired. In particular, the use of small-diameter ball with a ball diameter less than 0.3mm, especially] Ball-point pens with a ball diameter of 0.29mm or less are lost, compared with the ballpoint pen tip with six large-diameter ball-point pens. The friction speed with the retaining seat is 5 degrees. It is not 'worrying'. However, because the contact area of the ball is small, the wearer of the contact part is strongly 'resulting in it. As a result, the ball sinks easily, and its solution becomes an important issue. . However, when simply increasing the contact area between the receiving seat and the ball located therein, the deformation amount due to the pressing deformation of the inner protrusion has to be increased by 10%. Therefore, when the contact area between the ball and the holder is increased, the ink circulation hole and the ink guide groove will inevitably be reduced, so that the black water supply is insufficient during high-speed writing. Therefore, the eighth subject of the present invention is to use a small-diameter ballpoint pen tip, and by using the cutting amount for forming the ink circulation hole as appropriate, it is possible to reduce the ball sinking condition and ensure sufficient ink supply. In addition, in the ballpoint pen tip, it is necessary to suppress the friction between the front end portion of the holder and the paper surface as much as possible when writing. Furthermore, in order to prevent the ball from escaping from the front end of the holder, it is also necessary to hold the holding portion by the convergence portion. indeed. Use a ballpoint pen tip with a ball diameter of less than 0.3mm (especially a diameter of less than 〇29 and a diameter of 20 small diameter balls). Compared with a large diameter ball, the size of the ball protruding from the holder is smaller. Therefore, When writing, the front end of the holder is prone to contact with the paper surface, so it is often difficult to write, and there will be problems of ball jumping due to the wear of the front of the holder. In addition, the diameter of the ball is less than 0.3mm (especially the diameter The ballpoint pen tip of a small diameter ball smaller than 1238123 (introduction of the invention, 0.29mm) has a smaller size than the one using a large diameter ball to hold the ball. Therefore, The force has to be small. Therefore, the problem of abrasion mentioned above is added, and ball jumping is easy to occur. K 5 Therefore, the ninth problem of the present invention is to use a ballpoint pen tip with a small diameter ball to make the convergence part The amount of deformation required for the formation is appropriate, and the problem of ball jumping is effectively prevented. Furthermore, the subject of the present invention is to provide a ballpoint pen tip, which is used in a ballpoint pen tip using a small diameter ball, and is used to form The cut amount of the ink 10 flow hole is appropriate, and the amount of deformation required to form the convergence portion is appropriate, so as to reduce the sinking of the ball as much as possible and ensure sufficient ink supply, and it is not easy for the ball to escape [Summary of the Invention] Means for Solving the Problem 15 In order to achieve the foregoing object, the present invention has the following structure. In addition, the reference numerals are used in the embodiments of the invention, and φ does not limit the technical scope of the present invention. (No. 1 Invention) «Rong Yuzhe describes the first problem. The ballpoint pen tip of the first invention in the present invention has a holder 20 and a ball 30. The holder 20 is located near the metal thinner ^ ^ One end is pressed inward at a plurality of equidistant positions = the inner protrusion 22 is formed, and the ball 30 is inserted between the inner protrusion and the one end and the diameter is less than 0.33, and it is preferably 0.9 to be- In addition, by converging the edge of the one end inward 12 1238123, the invention description is formed with a converging portion 21, and the diameter of the ball 3G is 0 and the inner protrusion 22 is inside. When the diameter of the circle is F ' It is enough to refer to the relationship of d $ 0.6. The material of the metal thin tube in the invention of Di 1 should be Vostian iron-based non-recording steel. In particular, its carbon content should be less than 0.03% (for example, susm6l and so on. The material of the ball 30 is preferably such as cemented carbide, single steel, pottery, etc. The formation of the inner dog 22 can be performed by using, for example, a tapping tool with a spherical tip. Also, the inner protrusion 22 The number should be 3. 10 Convergence processing 'For example, the rotation processing of the roller can be used to perform the 〇15 According to the foregoing, the metal fine control of the ball 30 containing a diameter of less than 0.3_, preferably 〇29mm or less In the ballpoint pen tip 10, the amount of deformation required to form the inner big rise 22 is appropriate, which can prevent the ball chamber 23 from being deformed or protruded from the inner side due to the processing shadow. Ruptured and less likely to sink. (Second invention) 20 In view of the second problem described above, the ballpoint pen tip 10 'of the second invention of the present invention includes a holder 20 and a ball 30, and the holder 20 is located near one end of a thin metal tube. The inner protrusions 22 are formed by pressing inwardly at a plurality of places equidistant from the one end to form an inner protrusion 22, and the ball is inserted between the inner protrusion 22 and the one end with a diameter smaller than 0.3, and the most It is better for those below the noodle surface, and by converging the edge of the aforementioned one end inward to process y into a convergent σ a 21 ′, so that the diameter of the aforementioned ball 30 is d and 13 1238123 It is explained that when the protruding size of the ball 30 protruding from the front end of the convergence portion 21 is g and the inner diameter of the convergence portion 21 is η, the relationship of G / D-0.25 and 0.005mmSD — H ^ O.OlOmm is satisfied. . The material of the thin metal tube and the beads 30 in the second invention, and the formation and convergence processing of the inner protrusions 5 and 22 are the same as those of the first invention. According to the foregoing, in the ballpoint pen tip 10 of the metal fine-regulated ball-point pen 10 containing the ball 30 smaller than 0.3 mm and preferably 0.29 mm or less, the amount of deformation required to form the convergence portion 21 is appropriate and effectively Prevents obstructions and ball-jumping when writing. 10 (Third invention) In view of the third invention, the ballpoint pen tip 10 'of the third invention of the present invention includes a holder 20 and a ball 30, and the holder 20 is located near one end of the thin metal tube, and is distanced from the one end. The inner protrusions 22 are formed by pressing and deforming at a plurality of equidistant positions inward. The diameter of the ball 30 is inserted between the inner protrusion 22 of the 15 and the one end. The diameter is less than 0.3 mm, and preferably less than 0.29 mm. Further, the convergence portion 21 is formed by converging the edge of the one end inward, and the diameter of the ball 30 is D and the diameter F of the circle inscribed in the inner protrusion 22 is formed. When the protruding size of the ball 30 from the front end of the convergence portion 21 is G and the inner diameter of the convergence portion 20 21 is η, 0.4SF / D $ 0.6 and G / D20.25 and 〇 are satisfied. 〇〇5mm $ D — H $ 0.010mm relationship. The material of the thin metal tube and the bead 30 in the third invention, and the formation and convergence processing of the inner protrusion 22 are the same as those in the first invention. In accordance with the foregoing, in the ballpoint pen tip 1 () of the direct control containing less than 0.3mm, preferably 0.229mm or less, preferably 0.39mm, the ball-point pen 3G of the invention described in detail, the inner protrusion 22 and the convergence portion 21 are used. The amount of deformation required for the formation is appropriate, to prevent deformation of the bead chamber 23 or breakage of the inner protrusions 22 due to the effects of processing, and it is not easy to hairy balls / babies (½ ') and at the same time effectively prevent obstructions or beads during writing 5 In addition, in each of the foregoing inventions from the i-th invention to the third invention, the aforementioned metal thin tube is preferably formed of non-recorded steel having a nickel content of 10% by weight or more and a Vickers hardness of 350 or more. It can solve the bending or bead subsidence caused by the material of the metal thin tube. Furthermore, the non-recording steel should be a non-recording steel with a carbon content of less than 10% by weight. The socket generates frictional heat, and it is not easy to form chromium carbides. Therefore, lifting and abrasion will result in hardly bead sinking. (Fourth invention) ^ In addition to the fourth invention, the fourth invention Invention Ballpoint Pen Tip 15 10 &amp; a Holder And ball, the aforementioned retaining seat is attached to one end of the thin metal tube, and k P is pressed and deformed inwardly at a plurality of equidistant distances from one end to form an inner protrusion. 'The aforementioned ball is inserted into the inner protrusion and the aforementioned. The direct control between one end is less than 0.3mm ', and it is preferably 0.29mm or less, and the convergence end is formed by converging the aforementioned edge of the end toward the time and adding U. 20 Also, the aforementioned metal thin tube is 1 a 丄 θ &amp; is formed of stainless steel with nickel containing 10% by weight or more and having a Vickers hardness of 350 or more. The material of the metal thin tube and the ball 30 in the fourth invention, and the formation and convergence of the inner protrusion 22 The Jiawei system is the same as the i-th invention mentioned above. For example, stainless steel with a weight of more than 5% by weight, such as Vostian Iron System 15 1238123 @, invention description SUS316, SUS316L, SUS305 in uncast steel, etc. In other words, the ballpoint pen tip is formed by thin metal parts made of stainless steel with the aforementioned hardness, which can solve the problems of bending and ball sinking. In addition, the aforementioned stainless steel has a nickel content of 10% by weight or more. More ductile than No cracking occurs when the inner protrusion is formed. In addition, the aforementioned stainless steel should preferably be a Wastian iron-based stainless steel with a carbon content of 0 03% by weight or less. Therefore, even if frictional heat is generated between the ball and the ball bearing seat, As chromium carbides are formed, wear resistance is improved, and as a result, ball sinking is less likely to occur. 10 (Fifth Invention) In view of the aforementioned fifth problem, the ballpoint pen 40 of the fifth invention of the present invention also has a ballpoint pen tip. The ballpoint pen tip contains a containing tube 44 for holding ink, a holder 20 and a ball 30. The holder 20 is located near one end of a thin metal tube, and a plurality of equidistant distances from the end are pressed inward. 15 I-shaped and formed with an inner protrusion 22, the ball 30 is inserted between the inner protrusion 22 and the one end of the diameter is less than 0.3 mm, and preferably 0.29 mm or less, and by the aforementioned end Converging portions 21 are formed with the edges facing inward, and the diameter of the ball 30 is D, and the diameter of the inscribed circle of the inner protrusion 22 is F, and the ball 30 is formed. 20 of which protrudes from the front end of the aforementioned convergence portion 21 When the protruding size is G and the inner diameter of the convergence portion 21 is η, the relationship of 0.4 $ F / D $ 0.6, G / D-0.25 and 0.0005mm $ D—H $ 0.010mm is satisfied. According to Gil's, in the ball-point pen 40, the ball-point pen tip 10 of the metal fine-regulated ball-point pen tip 10 containing a ball diameter less than 0.3 nm, preferably 0.29 mm or less, 16 1238123 玖, the amount of deformation required to form the description of the invention is appropriate, 23 deformation and inner protrusions 22 can effectively prevent writing at the same time by using the inner protrusions 22 and the convergence portion 21 to prevent the ball chamber from rupturing due to the influence of processing ', and it is not easy for the ball to sink, and the current obstacles and obstacles The ball jumps off, and as a result, a smooth writing feeling can be achieved (sixth invention) 'The circle related to the sixth invention of the present invention

In view of the aforementioned sixth problem, the term "water-based ink" herein refers to ink that uses water as a basic material and has a thickening component or a coloring component dispersed therein. According to the foregoing, the ballpoint pen 15 of the ballpoint pen 40 related to the sixth invention has a nib 10 and a so-called pseudoplastic water-based ink having the aforementioned physical properties. Furthermore, the writing feel of the ball-point pen 40 containing such a pseudo-plastic water-based ink is smoother. (Seventh invention) In view of the seventh problem, the ballpoint pen tip 20 of the seventh invention of the present invention includes a ball 30 and a holder 20 for holding the ball 30. The holder 20 has a ball chamber 23 and ink. The hole 40A, the bead chamber 23 is used for receiving and enclosing the bead at one end so that it can rotate freely, and the ink hole 40A is penetrated by the bead chamber 23 at the other end of the opposite side of the bead to supply ink In the aforementioned ball 30, the ink hole 40a 17 1238123 玖, the description of the invention has at least an ink circulation hole 28A and an ink guide hole 27, and the ink circulation hole 28A is directed from the ball chamber 23 to the opposite side of the ball It is set so that the ink flows toward the bead chamber 23, and the ink guide hole 27 is provided on the ink, and the ball is opposite to the ball of the circulation hole 28A, and the * 5 ink is introduced into the ink circulation hole 28A, and is held in the holding seat. The outer periphery of the ball side of 20 is formed with a tapered portion 25 having a reduced diameter toward the ball side. The outer diameter of the ball 30 is less than 0.3 mm, and the ink guide hole 27 is connected to the ink circulation hole 28. Department Reduced diameter tapered shape of the reduced diameter bore · 42A, the maximum diameter of the reduced diameter p of the square hole 42A 4mm or more, and 10, Li said reduced diameter bore 42A taper angle of less than Q 3〇 ° 9〇 degrees lower. The ball 30 is used to apply ink to the writing surface, and may be formed using super hard alloy, hardened steel, ceramics, or the like. In the present invention, the outer diameter is less than 0.3 mm, and it is preferably formed to be ≦ 29ππη or less. 15 Lishu holding base 20 is used to hold the aforementioned ball 30. That is, in the cylindrical groove-shaped bead chamber 23 provided at the end of the holding seat 20 on the square side, the supporting ball 30 is received, received, and surrounded so that a part of the bead protrudes from the holding seat 20 to the outside and can be Free spin. · The retaining base 20 is formed by forming a tapered portion 25 with a small diameter of r 20 toward the bead side on the outer periphery of the bead side. In addition, the holding base 20 has an ink hole 40A penetrating from the aforementioned bead chamber 23 toward the opposite side of the bead to the other-side end. The ink hole 40a is used to supply ink to the ball 30. However, in accordance with the outer diameter of the ball 30, the aforementioned ball chamber 23 is also small in diameter. Therefore, the ink hole 40a is formed to be larger than the ink hole 40a 18 1238123. (2) The ink guide hole 27 and the ink circulation hole 28A ′ having a smaller diameter on the opposite side of the ball according to the invention to allow ink to flow smoothly in the ball chamber 23. The aforementioned ink circulation hole 28A is provided from the aforementioned bead chamber 23 toward the opposite side of the bead, and is a hole for supplying ink into the bead chamber 23, and is formed to have a diameter smaller than that of the bead 30. The ink guide hole 27 is provided on the opposite side of the ball of the ink circulation hole 28A, and is a hole for introducing ink toward the ink circulation hole 28A. The hole is formed to have a larger diameter than the ink circulation hole 28A. The diameter of the opposite end of the ball of OA is still small. Further, the portion of the ink guiding hole 27 connected to the ink circulation hole 28 'is a diameter-reducing hole 42A that is reduced in diameter toward the ball side and tapered. That is, in order to connect two holes with different inner diameters, the ball side of the ink guide hole 27 is reduced in diameter and tapered, and the smallest diameter of the reduced-diameter hole 42A is equal to the inner diameter F of the ink circulation hole 28A. The maximum diameter P of the reduced-diameter 15 hole 42A is equal to the minimum diameter of the ink guide hole 27. Further, a plurality of ink guide grooves 22A may be formed radially around the ink circulation hole 28A from the center of the ink circulation hole 28A. The ink guide groove 22A is a slit for allowing ink to fully circulate from the ink circulation hole 28A to the bead chamber 23, and may also pass from the bead chamber 23 to the ink guide holes 27, 20 and may also be provided in the bead chamber. 23 to the middle of the length of the ink circulation hole 28a. In the present invention, the maximum diameter p of the diameter-reducing hole 42A is formed to be 0.4 mm or more. By forming in this way, the introduction of ink from the ink guide groove 27 to the ink circulation hole 28a can be performed smoothly. As a result, 1238123 is not easy to produce. The invention explains that due to poor ink supply, the characters are blurred and the lines are broken. Situation. Further, in the present invention, the diameter-reducing hole taper angle Q of the diameter-reducing hole 42A is formed to be 30 degrees or more and 90 degrees or less. By doing this, when the ink flow to the bead chamber 23 is not hindered 'and the ink guide grooves 22A are formed by grooving processing, it is possible to make the thin layer portion less prone to churn processing defects. In addition, the taper angle R of the taper portion 25 of the holding base 20 is preferably equal to or more than one degree. By forming in this way, the surface can be made to ensure that the maximum diameter P ′ of the aforementioned reduced-diameter hole 42A, that is, the minimum diameter of the ink guide hole 27 is large, and the surface can be formed as thick as possible to make the thin layer portion 10, which can be performed. The relatively stable ink supply can make processing defects less likely to occur. (Eighth invention) 15

In view of the aforementioned eighth problem, the ballpoint pen tip of the eighth invention of the present invention includes a tapered portion 25, a ball chamber 23, an ink guide hole 27, an ink circulation hole 28A, and a ball 30. The tapered portion 25 is a cylindrical material The outer periphery of one end is cut into a thin head, and the ball chamber 23 is formed by cutting the inner periphery of the tapered portion M. The ink guide hole 27 is perforated from the other end of the cylindrical material to the vicinity of the ball chamber 23. In the former, the ink circulation hole 28A is formed between the ball chamber 23 and the ink guide hole 27, and the ball 30 is inserted into the ball chamber 23 with a diameter smaller than 0.3 mm, and It is preferable that the diameter is 0.29mm or less, and the edge of the _ end is converged inward to form a convergent portion, and the diameter of the BI beads 30 is D and the diameter of the ink circulation hole 28A is set. Is F 胄 and satisfies 0.6. 20 1238123 发明 Description of the invention The material of the cylindrical material in the eighth invention is preferably stainless steel, and particularly preferably ferritic magnetic system ballast steel. "Also, the material f of the ball 3G should be, for example, cemented carbide, hardened steel, non-scale steel, ceramics, etc. 5 The formation of the tapered portion 25 can be performed, for example, using a tapered cutter. Ball 23 The formation of the ink guide hole 27 can be performed using, for example, a drill type tool. The formation of the ink guide hole 27 can be performed using, for example, a reamer type 10 tool. The formation of the ink circulation hole 28A can be performed, for example. Auger drill is used. Here, the diameter of the ink circulation hole 28A must be smaller than the inner diameter of the ball to 23 from the foregoing relationship, but it must be smaller than the diameter of the ink guide hole. In addition, it is suitable for ink circulation Around the hole 28A, it is best to form 15 ink guide grooves 22A at three places to ensure the ink circulation. Convergence processing, for example, can be performed using a tapered roller. According to the foregoing, the diameter of the accommodation is less than 0.3mm In addition, it is preferable that the ballpoint pen tip 10 made of a cylindrical material of a ball 30 with a diameter of less than 29 cm is used to form an ink circulation hole 28A with a suitable cutting amount to prevent the ball chamber from being caused by the processing shadow of 20 sounds. 23 deformation and cracking, (Ninth invention) In view of the ninth problem, the ballpoint pen tip 10 of the ninth invention of the present invention includes a tapered portion 25, a ball chamber 23, an ink guide hole 27, an ink circulation hole 28A, And ball 30, the tapered portion 25 is formed by cutting the outside of one end of a cylindrical material 21 1238123, the description of the invention is formed by cutting the circumference into a thin head, and the ball chamber 23 is formed by cutting the inner circumference of the tapered portion 25, the ink The guide hole 27 is formed by perforating the other end of the cylindrical material to the vicinity of the aforementioned bead chamber 23. The ink circulation hole 28A is formed between the aforementioned bead chamber 23 and the aforementioned ink guide hole 27. And the above-mentioned ball 30 is inserted into the above-mentioned bead chamber 23 with a diameter of less than 0.33mm, and preferably 0.29mm or less, and the edge of the one end is converged inward to form a convergent portion. When the diameter of the ball 30 is D, and the protruding size of the ball 30 protruding from the front end of the convergence portion is G and the inner diameter of the convergence portion is η, g / D- 0.25 and 10 〇005mm $ D-HS0.01〇mm. The cylindrical material in the ninth invention And the material of the ball 30, and the formation and convergence processing of the tapered portion 25, the bead chamber 23, the ink guide hole 27, and the ink circulation hole 28A are the same as the aforementioned eighth invention. According to the foregoing, the containing diameter is less than 0. 3 mm, and preferably a ball-point pen tip 10 made of a cylindrical material with a diameter of 30 mm or less and a ball diameter of 30 or less, uses the appropriate amount of deformation required to form the convergence portion 21 to effectively prevent obstruction and roundness during writing (10th invention)-In view of the 10th problem just described, the ballpoint pen according to the 10th invention of the present invention, the "20 tip" system includes a tapered portion 25, a ball chamber 23, an ink guide hole 27, and ink circulation. The hole 28A and the bead 30. The tapered portion 25 is formed by thinning one end of a cylindrical material at one end. The aforementioned ball chamber 23 is formed by cutting the inner periphery of the tapered portion 25. The ink guide hole 27 is formed by perforating the other end of the cylindrical material to the vicinity of the aforementioned bead chamber 23. The ink circulation hole 22 1238123 发明, description of the invention

28A is formed through the space between the bead chamber 23 and the ink guide hole 27, and the diameter of the bead 30 inserted into the bead chamber 23 is less than 0.3mm, and preferably 0.29mm or less. The edge of the one end is converged inward to form a convergent portion, and the diameter 5 of the ball 30 is D, and the diameter of the ink circulation hole 28 A is F, and the reason of the ball 30 is When the protruding size of the front end of the convergence portion is G and the inner diameter of the convergence portion is Η, the relationship of 0.4SF / DS0.6, G / D-0.25, and 0.005mm $ D—HS 0.010mm is satisfied. The materials of the cylindrical material and the bead 30 in the tenth invention, and the formation and convergence processing of the tapered portion 25 10, the bead chamber 23, the ink guide hole 27 and the ink circulation hole 28A are the same as those of the eighth invention.

According to the foregoing, in the ballpoint pen tip 10 made of a cylindrical material containing a ball 30 having a diameter of less than 0.3 mm and preferably 0.29 mm or less, the deformation amount required to form the ink circulation hole 28A and the convergence portion 21 is used. Appropriate, and 15 can prevent the deformation and cracking of the bead chamber 23 due to the influence of processing, and it is not easy for the bead to sink, and at the same time, it can effectively prevent the obstruction and the ball from jumping off during writing. In addition, the technical features of the foregoing inventions can be arbitrarily combined as required. [Embodiment] Embodiments of the invention (1) First embodiment Hereinafter, a first embodiment of a ballpoint pen tip and a method for manufacturing the same according to the present invention will be described together with an example in the drawings. 23 1238123 (1) Figures 1 and 2 of the invention are front views of the ballpoint pen tip 10 of this embodiment, and FIG. 3 is a front view (A) and a top view (B) of the front end portion of the ballpoint pen tip 10. 4 to 10 are front views showing the manufacturing steps of the ballpoint pen tip 10, and FIGS. 11 to 13 are front sectional views showing a ballpoint pen 40 incorporating the 5 ballpoint pen tip 10. (1-1) Ballpoint pen tip 10 As shown in FIG. 1 and FIG. 2, the ballpoint pen tip 10 of this embodiment includes a holder 20 and a ball 30. (1-1-1) Holding base 20 10 The aforementioned holding base 20 is a structure for holding the ball 30. The holder 20 is formed of a thin metal tube made of Vosstian iron-based stainless steel having a carbon content of 0.03% or less. The Vostian iron-based stainless steel is made of SUS316, SUS316L or SUS305 with a nickel content of 10% or more. In addition, in the manufacturing process of the holder 20, processing steps such as annealing are added, so that the hardness of 15% is more than 350 Vickers hardness. The holding base 20 includes a cylindrical base portion 28 and a cylindrical reduction portion 29 '. The cylindrical base portion 28 is located at the rear end side when the cylindrical base portion 28 is combined with the ballpoint pen 40. The portion 29 is located on the front side when combined with a ballpoint pen, and the outer diameter is smaller than the base portion 28. 20

Then, the front end of the small part 29 becomes conical and converges 21 °. In the reduced part 29, when the distance from the convergence part 2i to the predetermined distance from the slave is formed, three inwardly crossing mountains are formed. Protrusions 22. The inner space of the reduced size 29 is a bead chamber 23 for containing the bead 30. 24 1238123 Rose, description of the invention The aforementioned reduced portion 29 has a conical tapered portion 25 on the outer periphery near the convergent portion 21. 0-1-2) Converging section 21 The 'converging section 21' is a structure for supporting the ball 30 accommodated in the bead chamber 23 5 from the front end side. The convergence portion 21 is provided at a front end portion of the reduction portion 29. The converging portion 21 is formed in a conical shape, and its inner diameter is smaller than the diameter (D) of the ball 30 (see Fig. 3A). (1-1-3) Inner side protrusion 22 The inner side dog 22 is a structure for supporting the bead 30 accommodated in the bead chamber 23 from the rear end side. The inner protrusions 22 are provided at a predetermined position of the reduction portion 29, that is, a total of three are provided at a predetermined distance from the coupling portion. The three inner protrusions 22 are provided in a radial shape by the center 20 of the holding seat 20 (see FIG. 3B). Each of the inner protrusions 22 protrudes toward the inner side of the holding seat 20. As a result, the inscribed circle radius (F) of the inner protrusion 22 is formed to be smaller than the diameter (D) of the ball 30. In addition, each of the inner protrusions 22 has a ball receiving seat 24 on a surface on the side of the ball chamber 23 connected to the ball 20 and 30. (11-4) Bead Chamber 23 The aforementioned bead chamber 23 is a structure for accommodating balls 30. The bead chamber 23 means an internal space between the convergence portion 21 and each of the inner protrusions 22. 1238123 (ii) Description of the invention The inner diameter of the ball chamber 23 is slightly larger than the diameter (d) of the ball 30. (M-5) Conical section 25. The conical section 25 described above is used to prevent the holder 20 from contacting the writing 5 surface when writing. The tapered portion 25 is formed on the outer periphery near the converged portion 21 of the reduced portion 29, and is provided in contact with the converged portion 21, and is formed in a conical surface shape that gradually increases in outer diameter from the front end side toward the rear end side.

(1-1-6) Ink guide hole 27 10 The ink guide hole 27 is a structure for supplying ink to the beads 30 housed in the bead chamber 23. «Hai ink guide hole 27 is formed as an inner space of a metal thin tube as a material 'and is connected to the rear end of the holder 20 to the bead chamber 23. (1-1-7) Ball 30 15 The aforementioned ball 30 is a structure for applying ink to a writing surface.

The ball 30 is formed of a cemented carbide. The diameter (D) of the ball 30 is 0.29 mm or less. The bead 30 is housed in the bead chamber 23, and only a portion (G) of a predetermined ball is protruded from the convergence portion 21 to the outside of the holding seat 20 (the spring 20 according to FIG. 3A) ). Then, the convergence portion 21 and the inner protrusions 22 are supported and held so that they can rotate freely on the front end side of the holding base 20. A minute gap called a gap is provided between the ball 30 and the convergence portion 21. The slit 26 is a passage for ink when writing. And, as the bead 30 rotates, the black water adhering to the surface of the bead 30 spreads. 12 1238123 发明, description of the invention Draw on the writing surface 'This draws lines on the writing surface. (1-2) Manufacturing method of ballpoint pen tip Next, a manufacturing method of the ballpoint pen tip 10 of this embodiment will be described. The manufacturing method of the ballpoint pen tip 10 of this embodiment includes a small step of shrinking, a cutting step, a pressing step, a completion step, and a convergence step. Figure 4 shows the front end side of the holder 20 before processing. The holding base 20 has an inner diameter (E) of a predetermined size. (1-2-1) Reduction step The aforementioned reduction step is a step of providing a reduction portion 29 on the front end side of the holder 20. Specifically, as shown in FIG. 5, a reduction process is performed by a roller 50 at a predetermined distance 前端 from the front end of the holding base 20, thereby forming a reduced portion 29 on the front end side of the holding base 20. Further, a portion other than the reduced portion 29 of the holding seat 20 forms the base portion 28. 15 U-1-2) Cutting step Description The cutting step is a step of unblocking the inner peripheral surface of the reduced portion 29 by cutting. Specifically, as shown in FIG. The inner diameter (κ, then * K &lt; E) constituting a predetermined size is made so as to sparse the inner peripheral surface of the through-reduction portion 29. (1-2-3) Pressing step ^ The step of pressing [Step 'is to perform pressing processing at a predetermined position of the reduction section 29' to set three inner protrusions 22 at predetermined positions of the reduction section 29. 1238123 发明 Description of the invention Specifically, as shown in FIG. 7, the outer peripheral surface is at a predetermined distance (L, but L &lt; J) at a predetermined distance (L, but L &lt; J) from the front end of the holding seat 20 of the reduction portion 29, and the end is spherical The slamming guard implements pressurization, thereby providing three inner protrusions 22 protruding toward the inner side of the holding base 20. The three inner protrusions 22 5 are arranged radially from the center of the holding base 20 (see item 3B). In addition, the deformation amount of the inner protrusion 22 in the pressing step is formed as such

The diameter F of the inscribed circle (however F &lt; K) and the aforementioned ball diameter D satisfy the degree of 0.4 ^ F / D $ 0.6. The other person, as shown in FIG. 8, uses a tapered cutter to cut the outer periphery of the front end 20 of the holding seat 20 into a cone shape, and a tapered portion 25 is provided. (1-2-4) Completion steps The aforementioned completion steps are shown in FIG. 9 by using a drill 80 to cut the surface on the inner side of the large outer side 邛 22 刖 and the inner peripheral surface from the inner protrusion to the front end, so that Μ The step of becoming the inner diameter of the pre-diameter size (however, larger than κ, and larger).

The interior of the reduced portion 29 on the front end side from each inner protrusion 22 becomes a bead chamber 23, and the front end surface of each inner protrusion 22 constitutes a bead receiving seat 24. In addition, an ink guide hole 27 is formed inside the holding seat 20 at the rear end side from the projection 22 at each time. (^ -2-5) Convergent Step 4 Convergent Step 'is a step of inserting convergent portion 21 on the end of the reduced portion 29 side of the mouth holder 20 after inserting the bead% into the bead chamber M . First, as shown in FIG. 10, the ball 30 is inserted at the front end of the tapered portion 25, and the ball is converged to form a mouthpiece 2b to form the ballpoint pen tip 10 shown in FIG. I. However, 28 1238123 发明, the description of the invention 'the deformation amount of the coincidence processing is formed as the aforementioned ball protruding size G, the aforementioned ball direct control D, and the aforementioned inner diameter of the front end of the convergence portion Η satisfies G / D-0.25 and 0.0. 〇5mm $ D — H $ 0.01mm. (1-3) The shape of the ball-point pen 40. The ball-point pen tip 10 formed in the foregoing steps is coupled to the ball-point pen 40 as shown in Fig. U. The ball-point pen 40 includes an ink containing tube 44, a shaft barrel 43, a connector 41, a ball-point pen tip 10, a sealing member ", and a tail plug 47. The ink containing tube 44 contains an aqueous gel-like ink 45 and an oily gel-like Ink follower 46. The connector 41 is a ballpoint pen tip mounted on the front end side, and a rear end side is mounted on the front end of the ink receiving tube 44 to connect the ballpoint pen tip 10 to the ink receiving tube 44. The outer part of the ballpoint pen tip 10 is formed, and the ink receiving tube 44 is contained inside. Furthermore, a sealing member 42 covering the connector 41 is tightened at the front end of the shaft barrel 43. A tail bolt 47 is installed at the rear end of the shaft barrel 43 That is, the 15 ballpoint pen 40 shown in the u figure is a so-called medium viscosity water-based gel ink ballpoint pen. In addition, the ballpoint pen tip 10 formed according to the foregoing steps is also combined with the ballpoint pen 4 shown in FIG. 12 The ball-point pen 40 includes a shaft barrel 43, a collector 49, a connector 41, a ball-point pen tip 10, a replacement core material, a rubber handle 43a, and a tail bolt 47. The shaft barrel 43 directly contains water-rich fluidity. Ink. Ink in shaft 43 penetrates The fibrous replacement core 48 is moved toward the connector 4! Of the ballpoint pen tip 10 by a capillary phenomenon. Furthermore, a plurality of straight tail fins are provided around the replacement core 48 to buffer the change in the internal and external force difference of the shaft cylinder 43. Collector 49. The front end of the shaft cylinder 43 has a thinner head, 29 1238123 123, the description of the invention can also cover the connector 41, and at the same time, there is a non-slip on the handle part of the shaft cylinder 43. The rubber handle 43a. That is, the ball-point pen 40 shown in FIG. 12 is a so-called straight liquid water-based ball-point pen. In addition, the ball-point pen tip 10 formed in the foregoing steps is also combined with the ball-point pen 40 shown in FIG. 13 The ball-point pen 40 includes a cotton pad 4 such as a connector 41, a ball-point pen tip 10, replacement cores, shaft cylinders, and a tail bolt 47. That is, the inside of the shaft cylinder 43 directly contains the cotton impregnated with water-based ink. The ink impregnated in the core passes through the fibrous replacement core 48 and moves toward the front end of the ballpoint pen tip 10 by the capillary phenomenon. The front end of the replacement core 48 is inserted into the ball chamber 23 from the rear end of the ballpoint pen tip. That is, as shown in FIG. 13 The ball-point pen 40 is a so-called mid-cotton water-based ball-point pen. (2) Second Embodiment Hereinafter, the second embodiment of the ball-point pen tip of the present invention and the method for manufacturing the ball-point pen will be described together with an example of the figure. 15 (2-1) Figure The illustration is a front view of the tip portion of the ballpoint pen tip of this embodiment. Figures 15 and 16 are front views of the ballpoint pen tip of this embodiment. Figure π is a front view of the 1G tip portion of the ballpoint pen tip. Top sectional view. Figures 18 to 24 are 20 views showing the manufacturing process of the ballpoint pen tip 10. (2-2) Ballpoint pen tip 10 The ballpoint pen tip 10 is shown in Figures 14 to 16 and includes There are a ballpoint pen 30 and a holder 2 () for holding the ballpoint pen 3 (). In addition, the above-mentioned holding seat 20 has at least a bead chamber 23 for accommodating the bead 30, a convergence part 2 for receiving 30 1238123 发明, and a description of the invention. The bead 30 accommodated in the bead chamber 23 does not jump out to the outside. And an ink hole 40A for supplying ink to the ball 30. (2-2-1) Holder 20 The aforementioned holder 20 is a slightly cylindrical member 5 for holding a ball 30. The aforementioned holder 20 is formed by using cylindrical materials such as brass, silver, stainless steel, etc. There is a bead chamber 23 for accommodating the beads 30, a convergence part 21 for preventing the bead 30 accommodated in the bead chamber 23 from jumping out, and an ink hole 40A for supplying ink to the bead 30. 10 Further, a thin tapered portion having a reduced diameter toward the ball side is formed on the ball side of the holding base 20 (that is, the outer periphery of the front end of the holding base 20). The inner space of the front end portion of the tapered portion is a bead chamber accommodating the ball 30, and the outer periphery of the front end portion of the tapered portion 25 is a conical convergent portion 21. The taper angle (outer taper angle R) of the taper portion 25 is preferably set to be greater than or equal to degrees. The relationship between the U㈣ shape taper angle R and the inner diameter of the ink guide hole 27 (the largest diameter of the reduced diameter hole 42A) described later is to 'allow the supply of ink to be performed well, and to prevent the occurrence of aberrations etc. during processing. The angle is based on the following. The outer diameter of the rear end portion of the mouthpiece holder 2G is a small diameter, and becomes a connecting portion 29A for connecting the ink 20 filler (refer to FIGS. 15 and 16). Further, as shown in Fig. 15, the internal space from the rear end to the front end of the holder 20 is an ink guide hole π having a stepped inner diameter. The ink guide hole 27 and the bead chamber 23 are penetrated by an ink circulation hole 28A. In addition, radial ink 31 1238123 is formed at four places around the ink circulation hole 28A. The invention describes a guide groove 22A, so that the ink 5 and the guide hole 27 can communicate with the bead chamber 23. (2-2- 3) Bead chamber 23 The bead chamber 23 is a space provided at one end of the holding seat 20 for accommodating the beads 5 30, and has a cylindrical side wall with an inner diameter larger than the diameter of the bead 30 and a cylindrical side wall of Judah. 51. A conical bottom surface portion 52 having a vertex side opposite to the ball. (Refer to FIG. 14) In addition, an ink circulation hole 28A having a predetermined diameter (F) is provided on the rear end surface of the cymbal bead chamber 23, thereby communicating with the ink guide hole 27. In addition, four ink guide grooves 22A (refer to FIG. 17) communicating with the ink guide holes 27 are radially perforated around the ink flow holes 28A. In addition, on the bottom surface portion 52, a ball receiving seat 24 having a concave spherical shape having a curvature almost the same as the curvature of the ball 30 is formed. The ball receiving seat 24 supports the ball 30 by a rear end. In addition, the angle of the bottom surface portion 52 can be appropriately selected between 90 degrees and 170 degrees. (2-2-3) Converging portion 21 The converging portion 21 is formed by forming one end of the bead chamber 23 side of the holder 20 into a conical shape. 'The bead 3 is supported and stored in the bead chamber 23 by the front end side. And also used to prevent the ball 30 from jumping out of the ball room 23. The convergence portion 21 20 is provided at a front end portion of the tapered portion 25. The converging portion 21 is formed in a conical shape, and its inner diameter (H) is smaller than the diameter (D) of the ball 30 (see Fig. 14). The convergence portion 21 is formed after the ball 30 is accommodated in the bead chamber 23, and is formed by performing rolling processing at the end of the holding seat 20. The inner diameter η 32 of the convergence portion 21 is 1238123. The bead diameter D of the bead 30 is still small. Furthermore, a gate of the inner part of the π joint 21 is provided, and a minute gap is provided between the ball 30 and the inner part 51. Make one of the balls 30 / eight jj ^, 1,, stab wounds from the other-mentioned ball room 23 to the outside, and at the same time borrow the converging section 21 sentences 产 * 出外 门 * 丨 Big out 'Achi can be free The r furnace turns 〇η ^ ^?, 々 疋 at the front end of the holder 20, so that the adhered ink is drawn on the writing surface to draw a line. The gap (gap) becomes the path for the ink. Second smallest (2-2-4) cone 25 10

The aforementioned tapered portion 25 is used to prevent the holder 2 () from contacting the surface when writing. Said "a" The tapered portion 25 is provided on the outer periphery near the convergence portion 21, is connected to the joint portion 21 ', and is formed into a conical surface shape in which the outer diameter gradually increases from the front end side to the rear end side.

(2-2-5) Ink hole 40A The ink hole 40A is penetrated from the bottom surface portion 52 of the bead chamber 23 to the solid portion.

The hole at the other end of the holder 20 is used to supply ink to the bead 30 stored in the bead chamber u. More specifically, the ink hole 40A is formed with an ink guide hole 27, an ink circulation hole 28A, and an ink guide groove 22A as shown in Fig. 15. The ink guide hole 27 is provided on the bead side of the ink hole 40A, and is a hole having a smaller diameter than the opposite side of the ball of the ink hole 40A. It is used to introduce and supply ink to the bead 30 stored in the bead chamber 23. . The ink guide hole 27 forms the internal space of the holding seat 20. As described above, the inner diameter is gradually reduced toward the front end side, and simultaneously passes through the ink circulation hole 28A and the ink 33 1238123. The invention description guide groove 22A and the ball. The chamber 23 communicates. That is, in order to supply ink from the large-diameter portion of the ink hole 40a to the small-diameter bead chamber 23, the inner diameter is gradually reduced, so that the ink is not easily clogged in the hole. -In addition, the ink guide hole 27 is connected to the ink flow hole 28A to be described later, and is cut into a diameter-reducing hole 42A that is reduced toward the ball side and is pinched and tapered. That is, the minimum diameter of the reduced diameter hole 42A is the same as the inner diameter of the ink circulation hole 28A, and the maximum diameter is the same as the minimum diameter of the ink guide hole 27. The maximum diameter ρ of the reduced-diameter hole 42A is formed to be 0.4 mm or more. When the size is less than 0.4 mm, the ink is prevented from flowing from the ink guide hole 27 10 to the ink circulation hole 28A, which may cause the characters to be blurred when writing. Therefore, the maximum diameter p of the diameter-reducing hole 42A is preferably set to be 0.4 mm or more. This basis is described later. In addition, the taper angle (taper angle Q of the reduced-diameter hole) of the reduced-diameter hole 42A is formed to be 30 degrees or more and less than 90 degrees. This is in the relationship between the diameter reduction hole 15 42A and the maximum diameter P. When the cone diameter Q of the diameter reduction hole is less than 30 degrees, it is necessary to increase the length of the diameter reduction hole 42A or the length of the ink circulation hole 28α φ, which is easy. Impede the flow of ink. In addition, when the taper angle Q of the diameter-reduced hole J is more than 90 degrees, the diameter-reduced hole "A" must be shortened. Therefore, it is necessary to increase the length of the ink circulation hole 28A or the ink bow I guide hole 27. The end is extended toward the bead side. In the former case, it is easy to hinder the flow of ink. In the latter case, the layer thickness of the 25 part of the cone portion of the holding seat 20 is reduced, and it is easy to cause processing due to buckling during processing. Defective opening The taper angle Q of the reduced-diameter hole should be formed to be 30 degrees or more and less than 90 degrees, and this will be described later. 34 1238123 玖 Description of the invention The ink circulation hole 28A is provided in the bottom surface portion 52 of the aforementioned ball chamber 23 and the aforementioned The hole between the bead-side ends of the reduced-diameter hole 42A is used to supply the ink introduced through the ink guide hole 27 into the bead chamber 23. The ink guide groove 22A is set to 5 radiation from the center of the aforementioned ink circulation hole 28A. The slits are used to sufficiently supply the ink introduced through the ink guide holes 27 into the bead chamber 23. The ink guide grooves 22A can be provided with three or even six according to the characteristics of the ink (four in this embodiment) The groove width can be less than 0.03 In addition, in the illustrated embodiment, the ink guide groove 22A is formed from the bottom surface portion 52 of the bead chamber 23 to the ink guide groove 27. However, it is based on the characteristics of the ink and the like. It can also be installed without penetrating. (2-2-6) Ball 30 Ball 30 is used to apply ink to the writing surface. The ball 3G is made of super hard alloy, non-recorded steel, hardened steel, and ballast 15 steel. Or shouts are formed into a spherical shape. In this embodiment, the straight ID system of the Bead River is formed below 0.29 mm. The bead 30 is stored in the bead chamber toward the holding seat 20 from the convergence portion. The projected size is only projected from the outside ⑼ (see page 20)

(Picture) ° 'It's converging portion 21 and the ball receiving seat 24 are pivoted to be held on the front end side of the holding seat 20 and can rotate freely. In addition, if the ball 30 is formed to have a rough surface with moderate friction resistance against the paper surface, it can be applied to the paper surface by rotating the ink in the ball chamber 23 by 40A during writing. In addition, between the ball 30 and the converging portion 21, there is a gap 12 35123 38123, which is a small gap (see FIG. 14). The slit 26 is a passage for black water during writing. And, as the ball 30 rotates, ink is ejected between the ball 30 and the convergence portion 21, and at the same time, the ink adhered to the surface of the ball 30 is drawn on the writing surface, 5 thereby drawing a line on the writing surface. (2-3) Manufacturing method of ballpoint pen tip 10 Next, a manufacturing method of the ballpoint pen tip 10 of this embodiment will be described. First, the outer periphery of the cylindrical retaining seat 20 before machining is cut to a small diameter by a cutter to form a continuous portion 29A (see FIG. 18). Then, perform the following steps in order. (2-3-1) Forming step of ink guide hole 27 From the rear end of the holder 20, it is initially cut to half with an offset of a large diameter. Then, toward the front end, the diameter of the drill bit 15 is sequentially reduced in several steps and cut to the vicinity of the front end to form an ink guide hole 27 (see FIG. 18). (2-3-2) Step of forming the tapered portion 25 The tapered portion 25 is formed by cutting from the front end of the holder 20 to a predetermined distance using a tapered cutter to form a tapered portion (see FIG. 19). (2-3-3) Step 28a of the center hole "The mouthpiece holder 20 is at the end" In order to guide the drill for processing the ink circulation hole% a to the center, use the center hole tool to process the conical center hole 28 &lt; Figure 20). (2-3-4) Step of forming ink circulation hole 28A: The center of the center hole 28a is described as a target, and a drill is used to pass through a predetermined size between the ink 1238123 and the water guide hole 27 of the invention, but Jingan 0-6) ink circulation hole 28A (refer to Figure 21). (2-3-5) Completion steps-Use a drill to cut the inner peripheral surface of the front end of the tapered portion 25 within a predetermined size. 5 diameter (M, but μ &gt; D). By this step, the internal space at the front end of the tapered portion 25 becomes a ball chamber ^, and the rear end surface thereof becomes a ball receiving seat 24 (see FIG. 22). (2-3-6) Grooving step g Insert the grooving tool through the ink guide hole 27 from the front end of the aforementioned ball receiving base 24 toward the ink circulation hole 28A to cut four radial grooves. These grooves become ink guide grooves 22A (see FIG. 23). (2-3-7) After the ball 30 is inserted into the ball chamber 23 in the tapping step, the ball receiving seat 24 is deformed along the shape of the ball 30 by pressing the ball toward the rear end as the upper part (see 15 for reference) (Figure 24). This step is performed to improve the abrasion resistance of the ball receiving seat 24 and to increase the contact area between the ball 30 and the ball receiving seat 24 at the same time. (2-3-8) Convergent Step The convergent step is a step of inserting the ball 30 into the bead chamber 23, and then providing the convergent portion 21 at the end of the cone portion 25 · 20. Specifically, after the aforementioned tapping step, a converging portion 21 is provided at the front end of the conical portion 25 using a conical roller to form a converging portion 21 to form a ballpoint pen tip 10 (see Figs. 14 and 15). However, the deformation amount of the convergence processing is formed so that the aforementioned ball protrudes to a size of 0, the aforementioned diameter of the ball D and the front 37 1238123 玖, the description of the front end inner diameter 敛 of the convergence section satisfies G / D-0.25 and 0.005 SD —HS is about 0.010mm. [Examples] Hereinafter, examples of the present invention will be described in comparison with comparative examples, but the present invention is not limited thereto. (1) The relationship between the diameter of the ball and the diameter of the inscribed circle of the inner protrusion, the protruding size of the ball, and the inner diameter of the front end of the convergence part (Part 1)

(1-1) Examples and Comparative Examples The balls 30 used in the examples and comparative examples are made of cemented carbide, and the diameter (D) of the 10 balls is 0.28 mm. The holder 20 is a thin metal tube made of SUS316L with an outer diameter of 0.6mm, an inner diameter of 0.3mm and a length of 8mm. The following Table 1 shows D, F / D, G / D, and (D-H) in each of the examples and comparative examples (however, F is the straight 15 diameter of the inscribed circle of the inner protrusion 22 ( mm), G series ball protruding size (mm), and Η is the inner diameter of the front end of the convergence part

(mm)). [Table 1] DF / DG / D DH (mm) (mm) Example 1 0.28 0.43 0.43 0.003 Example 2 0.28 0.43 0.23 0.013 Example 3 0.28 0.29 0.35 0.005 Example 4 0.28 0.64 0.35 0.005 Example 5 0.28 0.43 0.35 0.005 38 1238123 发明 Description of the invention Example 6 0.28 0.50 0.35 0.005 ^ Example 7 0.28 0.57 0.35 0.005 _ Example 8 0.28 0.43 0.32 0.008 ^ Example 9 0.28 0.50 0.32 0.008 ^ Example 10 0.28 0.57 0.32 0.008 _ Example 11 0.28 0.43 0.28 0.010 Comparative Example 1 0.28 0.29 0.43 0.003 ^ Comparative Example 2 0.28 0.64 0.43 0.003 ^ Comparative Example 3 0.28 0.29 0.23 0.013 Comparative Example 4 0.28 0.64 0.23 0.013 In addition, in the following description, the values in Table 1 above, The F / D value displayed in the second column is 0.4 or more and 0.6 or less is referred to as "the first condition". Also, among the values in the same table, the G / D value shown in the third column is 0.25 or more, and the (D-H) value shown in the fourth column is not less than 0.0005 and not more than 0.001. Make "the second condition". That is, conditions i, 2 and 5 to ^ satisfy the i-th condition. In addition, the second condition is satisfied from Examples 3 to Π. However, none of Comparative Examples i to 4 satisfies either the first condition or the second condition. The ballpoint pen tip 10 of each embodiment and each comparative example, as shown in Fig. U, is incorporated into the same pen body used in the commercially available ballpoint pen 40 (UM-151, Mitsubishi Oblique Pen Co., Ltd.) And for writing. The ink containing tube 44 of the ball-point pen 40 is filled with a pseudoplastic water-based ink having a composition shown in Table 2 below for writing. [Table 2] 39 1238123 发明,% by weight of the ingredients of the invention, soot powder 7.0 _ stupid vinyl acrylamine 3.0 _ ethylene glycol 20.0 potassium soap (lubricant) 0.4 — 1: 2-benzisothiazolonic acid (benzisothiazolonic acid) (Preservative) 0.2 Aminomethylpropanol (Ph regulator) 0.3 Benzotriazole (rust inhibitor) 0.2 Polyacrylate (propylene-based synthetic polymer) 0.1 Ion exchange water 68.8 (1-2) test project

For each of the foregoing examples and comparative examples, the following tests ① to ④ were performed, and the evaluations were performed as described below. ① Unsmoothness 5 A ball-point pen 40 incorporating a ball-point pen tip 10 of an example and a comparative example was used to evaluate the unsmoothness accompanying the writing by a functional test of the examiner's actual writing. Specifically, the examiners were evaluated as "AA" if they did not feel any sense of inconvenience, and "A" was evaluated as "A" when they felt that they did not constitute a degree of obstacles when writing. A person with a degree of difficulty in the degree of difficulty is evaluated as "b", and a person with a degree of difficulty in noting a significant degree of difficulty in writing the Japanese is evaluated as "c.", 40 1238123 玖, Description of the invention ② The deformation of the holder is based on ISO The writing tester of specification 14145-1 recognizes the deformation of the holder 20 after writing at 600m under the conditions of a writing speed of 4.5m / min, a writing angle of 60 °, and a writing load of 098N (100g weight). According to the commentary, 40% of the deformation of the holder is written. Specifically, the person who is hardly deformed is evaluated as "A", the person who is slightly deformed is observed as "B", and the person who notices significant deformation is rc " . ③ Ball holding force

10 The change in the holding force of the ball caused by writing is evaluated as "A", where the loosening of the convergence portion 21 is hardly visible, and the looseness of the convergence portion 21 is still "," and the person holding the ball 30 in the mouth is "B." ", And the case where the ball 30 falls off due to the loosening of the convergence portion 21 is" 0 ". ④Bead subsidence 15 _ _ ---, Yu Yushu ② After writing the same &lt; It ’s evaluated that the reduction in the protruding size of the beads is less than μ㈣, which is “A”, 25 um u μ π 1 # μπι or more and less than 35 μιη is “B”, and stone ≥ 35 μηι is rc ”.

20 In addition, in fact, none of the foregoing evaluation items to 11 and Comparative Examples 1 to 4 were evaluated as (1-3) the first condition, and those in the foregoing example "C". In the following, the effect that the ballpoint pen tip 1G meets the first condition will be reviewed separately from the case where the second condition is not satisfied and the case where it is satisfied. (1-3-1) Cases where the second condition is not satisfied 41 1238123 玖 The description of the invention is shown in Table 3 below. The G / D values of Example 1 and Comparative Example 1 and Comparative Example 2 are common, but they are not satisfied The second condition. In addition, with respect to the first example, the first condition was satisfied, and neither of the comparative example 1 and the second example satisfied the first condition. 5 [Table 3]

F / D G / D D-H ① ② ③ ④ Example 1 0.43 0.43 0.003 A A B A Comparative Example 1 0.29 0.43 0.003 A B B A Comparative Example 2 0.64 0.43 0.003 A A B B

From the results of the foregoing Table 3, Example 1 which did not satisfy the second condition and fulfilled the first condition was evaluated in the item of deformation of the holder (②), as compared with Comparative Example 1 where neither of the conditions 丨 and 2 was satisfied. As excellent. Moreover, compared with Comparative Example 2 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of the round 10-bead subsidence (④).

In addition, as shown in Table 4 below, the G / D values of Example 2 and Comparative Example 3 and Comparative Example 4 are common, but none of them satisfies the second condition, and, compared with Example 2, the first condition is satisfied, and Comparative Example 3 And Comparative Example * does not satisfy the first condition. 15 [Table 4] F / DG / D DH ① (2) ③ ④ J Example 2 0.43 0.23 0.013 BAAA Comparative Example 3 0.29 0.23 0.013 BBAA Comparative Example 4 0.64 0.23 0.013 BAAB According to the results in Table 4 above, it does not satisfy the second Conditions that satisfy Article 1 42 1238123 (ii) Example 2 of the invention description. Compared to Comparative Example 3, which did not satisfy both the first and second conditions, it was evaluated as excellent in the item of deformation of the holder (②). In addition, compared with Comparative Example 4 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of the ball subsidence (④). 5 10 That is, if the conditions of the G / D value and the (D-H) value of the ballpoint pen tip 10 are the same, and the second condition is not satisfied, the first condition can be clearly seen when the first condition is not satisfied. To performance improvement.

(1-3-2) When the second condition is satisfied, as shown in Table 5 below, the G / D values and (D-H) values of Example 5, Example 6 and Example 7 and Example 3 and Example 4 It is common, and both satisfy the second condition. In addition, with respect to Example 5, Example 6, and Example 7 all satisfy the first condition, and Examples 3 and 4 do not satisfy the first condition. 【table 5】

From the results of the foregoing Table 5, the fifth, sixth, and seventh examples satisfying the second condition and satisfying the first condition are in contrast to satisfying the second condition.

Example 3, which did not satisfy the first condition, was evaluated as excellent in the item of deformation of the retaining seat (②), and the evaluation of the item with a sense of unsmoothness (①) was also mentioned 43 15 1238123 发明, description of the invention. In addition, the examples $, 6 and 7 which satisfy the second condition and satisfy the first condition are more important than the second condition which is not satisfied! Example 4 of the condition was evaluated as excellent in the items where the bead subsided (④), and the evaluation was also improved in the items with a sense of instability (①). 5 That is, the conditions of G / D value and ①-H) value are the same, and when the second condition is satisfied, the performance of the ballpoint pen tip 10 can be clearly seen when the first condition is satisfied when the first condition is not satisfied. Promotion. In addition, as shown in Table 6 below, even if the G / D value and the (D-H) value are changed within the range satisfying the second condition, the evaluations of Example 8 to Example 10 within the range of the first condition are also satisfied. Just as good. [Table 6]

F / DG / D DH ① ② ③ ④ Example 8 0.43 0.32 0.008 AAAA Example 9 0.50 0.32 0.008 AAAA Example 10 0.57 0.32 0.008 AAAA (1-1-3) The effect of the first condition is as described above (1-3- The results of 1) and (1-3-2) are clear. Regardless of the second condition, when the F / D value is lower than the lower limit (0.4) of the first condition (Comparative Example of Table 3, Comparative Example of Table 4) 3. As in Example 3) of Table 5, the deformation of the holder is increased. When the F / D value of the second condition is higher than the upper limit (0 · 6) of the first condition (Comparative Example 2 in Table 3, Comparative Example 4 in Table 4, and Example 4 in Table 5), the ball sinks. Increase. That is, the first condition can be said to be an appropriate range of F / D values from the viewpoints of deformation of the holder and sinking of the beads. 20

(1-4) Review of the second condition 44 1238123 发明. Description of the invention In the following, the effect when the ballpoint pen tip 10 satisfies the second condition is divided into whether the first condition is not satisfied and the i condition is satisfied for review. (1-4-1) When the first condition is not satisfied As shown in Table 7 below, the F / D values of Example 3 and Comparative Example 丨 and Comparative Example 3 are equal, but none of them satisfy the first condition. In addition, the second condition is satisfied with respect to Example 3, a comparative example! And Comparative Example 3 did not satisfy the second condition.

[Table 7]

F / D G / D D— Η ① ② ③ ④ Example 3 0.29 0.35 0.005 A B A A Comparative Example 1 0.29 0.43 0.003 A B B A Comparative Example 3 0.29 0.23 0.013 B B A A

From the results in Table 7 above, Example 3 which did not satisfy the first condition and 10 of Article 2 was compared with Comparative Example 1 where neither of the first condition and the second condition was satisfied. It was evaluated as excellent in the project. In addition, Comparative Example 3, which neither satisfied the first condition and the second condition, was evaluated as excellent in the item with a sense of unsmoothness (①). In addition, as shown in Table 8 below, the F / D values of Example 4 are the same as those of Comparative Example 2 and Comparative Example 4, but neither of them satisfies the first condition. In addition, compared with Example 4, the second condition was satisfied, and Comparative Example 2 and Comparative Example 4 did not satisfy the second condition. [Table 8]

F / D G / D D— H ① ② ③ Example 4 0.64 0.35 0.005 A A A B 45 1238123

Example 4 of the present invention was evaluated as excellent in the item of the bead holding force (③), as compared with Comparative Example 2 in which neither the first condition nor the second condition was satisfied. Moreover, compared with Comparative Example 4 in which neither of the first condition and the second condition was satisfied, it was evaluated as excellent in the items that did not feel smooth (①). That is, the condition of the F / D value of the ballpoint pen tip 10 is the same, and if the first condition is not satisfied, the performance improvement can be clearly seen when the second condition is satisfied when the second condition is not satisfied. (1-4-2) When the first condition is satisfied 10

As shown in Table 9 below, the F / D values of Example 5, Example 8 and Example i i are the same as those of Example 1 and Example 2 and all satisfy the first condition. In addition, with respect to Example 5, Example 8, and Example U, all satisfy the second condition, and both Example 1 and Example 2 do not satisfy the second condition. [Table 9] ^ F / DG / DD— Η ① (?) ③ ④ 5 0.43 0.35 0.005 ΑΑ AAA 8 0.43 0.32 0.008 AAAA 11 0.43 0.28 0.010 AAAA .__ Left Example 1 0.43 0.43 0.003 AABA 2 0.43 0.23 0.013 BAAA From the results of the aforementioned Table 9, Example 5, Example 8 and Example 11 satisfying the first condition and satisfying the second condition are compared with satisfying Article 丨

46 15 1238123 (ii) Example i of the invention which does not satisfy the second condition is evaluated as excellent in the item of the ball holding force (③). In addition, Example 5, Example 8, and Example u that satisfy the second working condition and meet the second condition are relatively uncomfortable compared to Example 2 that satisfies the first condition but does not satisfy the second condition. (①) of · 5 The project was evaluated as excellent. That is, the conditions of F / D are the same, and when the i-th condition is satisfied, when the second condition is satisfied, the performance of the ballpoint pen tip 10 can be seen clearly when the second condition is not satisfied. The effect of the second condition of spring (1-4-3) ίο From the results of (1-4-1) and d-4-2) above, it is clear that regardless of the first condition, when the G / D value is lower than the second When the lower limit of the condition is (0 · 25), and the value of (D-1) is higher than the upper limit of the second condition (0.01〇111111) (Comparative Example 3 of Table 7, Comparative Example 4 of Table 8, and Implementation of Table 9) Example 2), the uncomfortable feeling increases. Regardless of the first condition, when the G / D value satisfies the second condition but (D-print value 15 is lower than the lower limit of the second condition (0.005mm) (Comparative Example i in Table 7, Comparative Example 2 in Table 8, As in Example 1 of Table 9, the ball holding force is reduced. That is, the second condition can be said to be the value of the G / D value and the (D-H) value from the viewpoint of the feeling of irregularity and the ball holding force. Appropriate range. (1-5) Evaluation summary '20 As mentioned above, even when only one of the first and second conditions is satisfied, the performance of the ball-point pen tip can be clearly seen when these conditions are less satisfied ( Table 3, Table 4, Table 7, Table 8) In addition, when both of the first and second conditions are satisfied, of course, when neither of these conditions are satisfied, and when either of these conditions is satisfied, 47 1238123 发明, the description of the invention clearly sees the improvement of the performance of the ballpoint pen tip 10 (Table 5, Table 9). That is, the appropriateness of the foregoing F / D value range and the appropriateness of the G / D value and (D-H) value range, It can help to improve the performance of the ballpoint pen tip 10 from the side, and at the same time, when these complement and complement each other, the performance of the round 5-point pen tip 10 can be further improved. 2) The relationship between the diameter of the ball and the diameter of the inscribed circle of the inner protrusion, the protruding size of the ball, and the inner diameter of the front end of the convergence portion (the second)

(2-1) Examples and Comparative Examples The balls 30 used in the examples and comparative examples are all made of cemented carbide 10, and the ball diameter (D) is 0.18 mm. The holder 20 is a thin metal tube made of SUS316L, with an outer diameter of 0.6 mm, an inner diameter of 0.22 mm, and a length of 8 mm.

The following Table 10 shows D, F / D, G / D, and (D-H) in each of the examples and comparative examples (however, the inside diameter of the F-type inner protrusion 22 and the diameter of the circle (mm) ), G is the value of the protruding size (mm) of the ball and the diameter (mm) of the front end of the convergence portion. [Table 10] DF / DG / D DH (mm) (mm) Example 12 0.18 0.44 0.36 0.003 Example 13 0.18 0.44 0.22 0.013 Example 14 0. 18 0.36 0.31 0.005 Example 15 0.18 0.660 0.31 0.005 Example 16 0.18 0.44 0.31 0.005 48 1238123 Description ___Example 17 0.18 0.50 0.31 0.005 __ ^ Example 18 0.18 0.55 0.31 0.005 __Example 19 0.18 0.44 0.28 0.008 Example 20 0.18 0.50 0.28 0.008 Acoustic Example 21 0.18 0.55 0.28 0.008 __ ^ Example 22 0.18 0.44 0.25 0.010 __Comparative Example 5 0.18 0.36 0.36 0.003 ___Comparative Example 6 0.18 0.66 0.36 0.003 ___Comparative Example 7 0.18 0.36 ^ 0.22 0.014 __Comparative Example 8 ~ ------- 0.18 0.66 ----------- _0.22 0.014 In the following description, among the values in the aforementioned table 10, the F / D value shown in the second column is 0.4 or more and 0.6 or less , Called "the first condition". Also, among the values in the above table, when the G / D value shown in the third column is 0.25 or more, and when (D to H) shown in the fourth column is not less than 0.0005 and not more than 50.010, This is called "the second condition". That is, the twelfth condition is satisfied by the examples 12, 13, and 16 to 22. It is to be noted that the second condition is satisfied from Examples 14 to 22. However, none of Comparative Examples 5 to 8 satisfies either the i-th condition or the second condition. The ballpoint pen tip 10 of each example and each comparative example, as shown in FIG. 10, is incorporated into the same pen body used in the commercially available ballpoint pen 40 (View) 51, Mitsubishi New Pen Co., Ltd., And for writing. In addition, the ink containing tube 44 of the ball-point pen 40 is filled with a pseudoplastic water-based ink having the composition shown in Table 2 for writing 49 1238123 玖, invention description (2-2) The test items are implemented for the foregoing Examples and comparative examples were applied in the same manner as in (1-2) above except for ① a feeling of blame, ② deformation of the holder, ③ ball holding force, and ④ the test of the ball &gt; daughter-in-law. . In addition, in fact, none of the above-mentioned evaluation items was evaluated as "rc" in Examples 12 to 22 and Comparative Examples 5 to 8.

(2-3) Review of the first condition In the following, the effect that the ballpoint pen tip 10 satisfies the first condition will be divided into whether the second condition is not satisfied and the second condition is satisfied. (2-3-1) When the second condition is not satisfied, as shown in Table 11 below, the G / D values and (D-H) values of Example 12 and Comparative Examples 5 and 6 are the same, but neither of them meets the 2 conditions. And ′ satisfies the first condition with respect to Example 12, Comparative Example 5 and Comparative Example 6

The first condition is not satisfied. [Table 11]

F / DG / DD— Η ① (2) ③ ④ Example 12 0.44 0.36 0.003 AABA Comparative Example 5 0.36 0.36 0.003 ABBA Comparative Example 6 0.66 0.36 0.003 AABB According to the results in Table 11 above, the second condition is not satisfied but the first condition is satisfied. Example 12 of the condition was evaluated as excellent in the item of deformation of the retaining seat (②), as compared with Comparative Example 5 in which neither the first condition nor the second condition was satisfied. Moreover, compared with Comparative Example 6 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of 50 20 1238123 玖, description of the invention (④). 5 In addition, as shown in Table 12 below, the G / D values of Example 13 and Comparative Examples 7 and 8 are the same, and the (D-H) values are almost the same, but neither of the two conditions is satisfied. In addition, compared with Example 13, the first condition was satisfied; Comparative Example 7 and Comparative Example 8 did not satisfy the first condition. [Table 12]

From the results in Table 12 above, the second condition is not satisfied but the

Example 13 with 10 15 conditions was evaluated as excellent in the item of deformation of the retaining seat (②) compared to Comparative Example 7 where neither of the conditions 丨 and 2 was satisfied. In addition, compared with Comparative Example 8 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of the bead subsidence (④).

That is, the ballpoint pen tip 10 has almost the same G / D value and (D-H) value conditions, and if the second condition is not satisfied, it can be clearly seen that the first condition is satisfied when the first condition is satisfied Improved performance. (2-3-2) When the second condition is satisfied, as shown in Table 13 below, the G / D values of Example 16, Example 17 and Example 18 and Example 14 and Example 15 are the same as each other. And all meet the second condition. In addition, with respect to Example 16, Example 17, and Example 18, all satisfy the first condition, and Example 14 and Example 15 do not satisfy the first condition. 51 20 1238123 发明, Description of the invention [Table 13]

From the results of the foregoing Table 13, Examples 16, 17 and 18 meeting the second condition and meeting the 丨 condition, compared to the embodiment 14 meeting the second condition but not the i condition, are all in the holding seat. Distorted items (②) were evaluated as excellent, and unsmooth items (①) were improved. Furthermore, Example 16, Example Π, and Example 18 meeting the second condition and satisfying the 丨 condition are all subsided to the ball as compared to Example 15, which satisfies the second condition but does not satisfy the first condition (④) Item 10 was evaluated as excellent, and the evaluation of the item (1) was not smooth. That is, when the conditions of the G / D value and the (D-H) value are the same, and when the second condition is satisfied, the performance of the ballpoint pen tip 10 can be clearly seen when the condition 丨 is satisfied when the condition 丨 is not satisfied. Promotion. In addition, as shown in Table 14 below, even if the G / D value and the (D-H) value are changed within a range that satisfies the second condition, the evaluation of Examples 19 to 21 within the range that satisfies the first condition is Just as good. [Table 14] F / DG / DD — Η ① ② ③ ④ 52 15 1238123 Rose, Invention Description Example 19 0.44 0.28 0.008 AAAA Example 20 0.50 0.28 0.008 AAAA Example 21 0.55 0.28 0.008 AAAA (2-3-3) The effect of the first condition can be clearly understood from the results of (2-3-1) and (2-3-2). Regardless of the second condition, when the F / D value is lower than the lower limit of the first condition (0.4 ) (Comparative Example 5 of Table η, Comparative Example 7 of Table 12, and Example 14 of Table 13), the deformation of the holder increases. Regardless of the second condition, when the F / D value is higher than the upper limit (0.6) of the first condition (Comparative Example 6 in Table 11, Comparative Example 8 in Table 12, and Example 15 in Table 13, the ball subsidence increases. That is, from the viewpoint of the deformation of the holder and the sinking of the ball, the first condition can be said to be an appropriate range of F / D value. (2-4) The review of the second condition is as follows. When the ballpoint pen tip 10 satisfies the second condition The effect is reviewed when the first condition is not satisfied and when the first condition is satisfied. (2-4-1) When the first condition is not satisfied, as shown in Table 15 below, Example 14 and Comparative Example 5 and Comparative Examples The F / D values of 7 are common, but none of them satisfy the first condition. In addition, compared with Example 14 which satisfies the second condition, Comparative Example 5 and Comparative Example 7 do not satisfy the second condition. [Table 15] F / DG / DD— H ① ② ③ ④ 53 1238123 发明, description of the invention

Example 14 0.36 0.31 0.005 A B A A Comparative Example 5 0.36 0.36 0.003 A B B A Comparative Example 7 0.36 0.22 0.014 B B A A

From the results described in Table 15, Example 14 which does not satisfy the first condition and satisfies the second condition, is compared with the item 5 in which neither the first condition nor the second condition is satisfied in Comparative Example 5. The evaluation was excellent. Moreover, compared with Comparative Example 7 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of feeling of unsmoothness (①). In addition, as shown in Table 16 below, the F / D values of Example 15 are the same as those of Comparative Example 6 and Comparative Example 8, but neither of them satisfies the first condition. Furthermore, Comparative Example 6 and Comparative Example 8 did not satisfy the second condition with respect to Example 15 satisfying the second condition.

[Table 16] F / D G / D d-h ① ② ③ ④ Example 15 0.66 0.31 0.005 A A A B Comparative Example 6 0.66 0.36 0.003 A A B B Comparative Example 8 0.66 0.22 0.014 B A A B 10

Based on the results in Table 16 above, the item 15 of the Example 15 'which does not satisfy the first condition and satisfies the second condition is compared to the item 6 which does not satisfy the condition i and the condition 2 of Comparative Example 6'. The evaluation was excellent. In comparison with Comparative Example 8, which did not satisfy both the i-th condition and the second condition, it was evaluated as excellent in the item of feeling of unsmoothness (①). That is, the conditions that do not satisfy the F / D value of the ballpoint pen tip H) are the same, and in the case of condition 1, when the second condition is satisfied, it is less satisfied 54 54 1238123 玖, the second condition of the invention description can be clearly seen To performance improvement. (2-4-2) When the first condition is satisfied, as shown in Table 17 below, the F / D values of Example 6, Example 19, and Example 22 are the same as those of Embodiment 12 and Example 13, and all meet the F / D values. 5 1 condition. In addition, with respect to Example 16, Example 19, and Example 22, the second condition is satisfied, and neither Example 12 nor Example 13 satisfies the second condition. [Table 17]

F / DG / DD—Η ① (2) ③ ④ Example 16 0.44 0.31 0.005 ΑΑ AAA Example 19 0.44 0.28 0.008 AAAA Example 22 0.44 0.25 0.010 AAAA Example 12 0.44 0.36 0.003 AABA Example 13 0.44 0.22 0.013 BAA — -A From the results of the foregoing Table 17, the 16th embodiment, 19th embodiment, and 22nd embodiment that meet the condition 丨 and meet the 10th condition of Article 2 are compared to the embodiment 12 that satisfies the first condition but does not meet the second condition , All were evaluated as excellent in the items of ball holding force (③). In addition, Embodiment 16, Embodiment 19, and Embodiment 22 that satisfy the i-th condition and the second condition are all less smooth than those that satisfy the first condition but do not satisfy the second condition. 15 ( ①) The items were evaluated as excellent. That is, the conditions of the F / D value are the same, and if the condition i is satisfied, # 2 is satisfied when the second condition is not satisfied, and the aunt sees the performance improvement of the ballpoint pen tip 10. 55 1238123 发明, Description of the invention (2-4-3) Effect of the second condition

From the results of (2-4-1) and (2-4-2), it is clear that regardless of the first condition, when the G / D value is lower than the lower limit of the second condition (0.25), and (D — H When the value) is higher than the upper limit (0.010 mm) of the second condition (Comparative Example 7 5 in Table 15, Comparative Example 8 in Table 16, and Example 13 in Table 17), the feeling of unsmoothness increases. Regardless of the first condition, when the G / D value satisfies the second condition but the (D-H) value is lower than the lower limit of the second condition (0.005mm) (Comparative Example 5 in Table 15, Comparative Example 6 in Table 16, In Example 12 of Table 17, the ball holding force was decreased. That is, the second condition is considered to be an appropriate range of the G / D value and the (D-H) value from the viewpoint of the feeling of irregularity and the holding power of the ball. (2-5) The summary of the evaluation is as described above. Even when only one of the first condition and the second condition is satisfied, the improvement of the performance of the ballpoint pen tip 10 can be clearly seen when these conditions are not satisfied (Table 11, Table 12 , Table 15, Table 16). 15 Furthermore, when both the first condition and the second condition are satisfied, of course, neither of them

When these conditions are met, and when only one of these conditions is met, the performance improvement of the ballpoint pen tip 10 can be clearly seen (Table 13, Table 17). gp, the appropriateness of the aforementioned F / D value range, and the appropriateness of the G / D value and (D-H) value range can be improved from the side to help the ballpoint pen tip 10 performance of 20, and at the same time, when these complement each other and appropriate , The performance of the ballpoint pen tip 10 can be further improved. (3) Review of the holder material (3-1) Examples and Comparative Examples The balls 30 used in the examples and comparative examples are made of cemented carbide 56 1238123 玖, description of the invention, and the diameter of the balls (D) It is 0_28mm.

The holding seat 20 is formed by using either a metal thin tube made of SUS316L with a nickel content of 11.8% by weight or a metal thin tube made of SUS304 with a nickel content of 8.3% by weight. Any metal thin tube is 0.6mm in outer diameter, 0.3mm in inner diameter and 8mm in length. The Vickers hardness is adjusted by the presence or absence of annealing. In addition, Vickers hardness is measured by a micro hardness tester ((Shares) Akashi Corporation, MVK-E). The materials and Vickers hardness of each of the examples and comparative examples are shown in Table 18 below. [Table 18] Material Vickers hardness (Hv) Example 23 SUS316L 370 Comparative example 9 SUS316L 190 Comparative example 10 SUS304 355 Comparative example 11 SUS304 180

10 The ballpoint pen tip 10 of each embodiment and each comparative example, as shown in FIG. 11, is incorporated into the same pen body used in the commercially available ballpoint pen 40 (UM-151, Mitsubishi Pencil Co., Ltd.) for writing . The ink containing tube 44 of the ball-point pen 40 is filled with so-called pseudoplastic water-based ink having the composition shown in Table 2 for writing. (3-2) Test items For each of the foregoing examples and comparative examples, the following tests ⑤ to ⑦ were performed, and the evaluations were performed according to the following. ⑤ Workability 57 1238123 玖, description of the invention &gt; When the inner protrusion 22 is formed, it is caused by cracks, deformation, or presence or absence: An evaluation was performed. Specifically, 'respectively the case where none of the foregoing conditions are present is A', and the evaluation of any of these conditions is evaluated as% 〇 * ⑥ The ball is sinking, and a writing tester according to the auxiliary specification ⑷⑹ is used to write at a speed 4.5m / min, writing angle 60. And writing load 〇 _ (repetition weight) conditions, after the _m spiral writing, to measure the reduction in the size of the ball for evaluation. Specifically, "A" is evaluated as the reduction in ball protrusion size of less than 20 mm, "B" is greater than 20 mm and less than π⑽, and rc is greater than 27 #m. ⑦ Bending deformation 15 Using a writing tester according to the ISO standard, measure at a writing speed of 4.5 m / min and a writing angle of 60. Under the conditions, the amount of bending of the tip of the ballpoint pen tip 10 after the 嶋 m spiral writing with a writing load of 0.1 side (50 g weight) or 0.98 N (100 g weight) was evaluated. Those with a uranium end curvature of less than 0.1 mm were evaluated as "specifically, eight", exceeding 0.1 mm

If it is less than 0.2mm, it is "B", and (3-3) Test result 0.2mm or more is rc ". 20 The evaluations of the foregoing examples and comparative examples in the foregoing tests are shown in Table 19 below. [Table 19]

------ ------- Ni (%) ------- ------ Exempt --- Example 23 11.8 --------- 370 AAAA 58 1238123 玖, Invention description

Comparative Example 9 11.8 190 A B B B Comparative Example 10 8.3 355 C A A A Comparative Example 11 8.3 180 A C B C

First, Example 23 with a nickel content of 10% by weight or more and a Vickers hardness of 350 or more is compared to Comparative Example 9 with a nickel content of 10% or more but a Vickers hardness of less than 350. It is found in ball subsidence (⑤) and bending deformation (⑦) The evaluation of the project is excellent. That is, the nickel content of 10% by weight or more makes the processability good, and the Vickers hardness is 350 or more, which effectively prevents the ball from sinking and bending. In addition, the foregoing Example 23 is 350 or more than the Vickers hardness but the nickel content is less than Comparative example 10 of 10% was evaluated excellent in the item of workability (⑤). That is, the Vickers hardness is 350 or more to effectively prevent the sinker 10 from sinking and bending, and the workability is improved when the nickel content is 10% by weight or more. Incidentally, in Comparative Example 11 in which the nickel content is less than 10% by weight and the Vickers hardness is less than 350, the workability (⑤) is good because of the low hardness, but the evaluation of ball subsidence (⑥) and bending deformation (⑦) is relatively Comparative Example 9 is even worse, and 15 cannot be practically used after all. (4) Evaluation of the maximum diameter p of the direct reduction hole, the taper angle 直径 of the diameter reduction hole, and the external taper angle R The ballpoint pen tip 10 of the present invention and the ballpoint pen tip of the comparative example were respectively tried and evaluated using these. 20 That is, the ball-point pen tip 59 used in the holder 20 has a diameter reduction hole maximum diameter P, a diameter reduction hole taper angle Q, and an external taper angle R, respectively. 59 1238123 Rose, description of the invention, (4-1) high-speed writing And (4_2) workability evaluation test. The ball diameter D of the ball 30 is 0.25 mm, and the material is made of cemented carbide. The holder 20 is formed of non-recorded steel. -Also, the ink is used at 25 ° C and a shear speed of 38.4sec- 丨. 5 For a viscosity of 100mPa. Sec, the composition is as shown in Table 2 above. (4-1) High-speed writing performance The South-speed writing performance is spiral writing at a writing speed of 9 m / min, and the evaluation characters are not ambiguous. The evaluation is as follows. · AA: No word ambiguity occurred. 10 A · Fuzziness hardly occurs. B: The words are a bit vague but not very serious. C: The words are very vague. (4-2) Workability The workability is when the ink guide groove M is formed by grooving, and it is adjusted to check whether there is a machining defect due to the huff. That is, the ballpoint pen tip 10 of each structure shown in Table 20 below was processed. At the time of 0.00, the percentage of the entire process was investigated. The evaluation is as follows. · ΑΑ: No processing defects occurred (0%). · 20 A · Machining defects occurred, but very few (0 to 0.02%). B: Some processing occurred; j; Good, but it did not pose a problem in terms of production efficiency (0.02 to 1%). C: serious processing defects occur). [Table 20] 60 1238123 玖, description of the invention

D (mm) P (mm) Q (degree) R (degree) High-speed writing processability Example 24 0.25 0.4 30 30 B AA Example 25 0.25 0.4 60 30 AA Example 26 0.25 0.4 90 30 AA B Example 27 0.25 0.5 30 35 A AA Example 28 0.25 0.5 60 35 AA A Example 29 0.25 0.5 90 35 AA B Comparative Example 12 0.25 0.4 25 30 C AA Comparative Example 13 0.25 0.4 95 30 AA C Comparative Example 14 0.25 0.35 60 30 CA Comparative Example 15 0.25 0.35 90 30 CB

The results of the foregoing experiments are, first of all, from the viewpoint of high-speed writing, the characters of Comparative Example 12, Comparative Examples 14 and 15 are rather ambiguous. That is, Comparative Example 12 is a case where the values of P and R are the same as those in Examples 24 to 26 but the Q value is less than 30 degrees. In Comparative Example 14 and Comparative Example 15, the angles of Q and R are the same as those in Example 5 and 25 and 26, but P When the value is less than 0.4mm. In Comparative Example 12, the Q value, that is, the taper angle of the diameter reduction hole is small, so the distance between the ink guide hole 27 and the ink circulation hole 28A is long, which hinders the ink supply. In Comparative Example 14 and Comparative Example 15, the P value, which is the largest diameter of the reduced-diameter hole, is small. Therefore, ink clogging occurs between the ink guide hole 10 27 and the ink circulation hole 28A. In addition, in Example 24, the words were slightly ambiguous but not very serious. It can be thought that when the Q value is 30 degrees, the ink guide hole 27 61 1238123 玖, the distance between the ink guide hole 28A and the ink flow hole 28A is increased, which slightly hinders the supply of ink. In addition, in Examples 25 to 29, there was no or almost no illegibility. These systems are all formed with a p-value of 0.4 mm or more and a q-value of 5 30 degrees or more and 90 degrees or less. Here, the q value of Example 27 where the word ambiguity hardly occurs is the same as that of Example 24 where the word ambiguity slightly occurs, but the P value is 0.5 mm, which is larger than that of Example 24. Therefore, the supply of ink to Lu is smooth, and almost no ambiguity occurs. In addition, the Q value of Example 28 in which the illegibility of word form 10 did not occur at all was 60 degrees as in Example 25 in which word ambiguity was hardly occurred, but for the same reason as above, no word ambiguity occurred. . Next, from the viewpoint of processability, severe machining failure occurred in Comparative Example 丨 3. That is, the values of P and R are the same as those in Examples 24 to 26, 15 but the Q value is 90 degrees or more. This is because increasing the Q value shortens the length of the direct-control reduction hole 42A, and it is necessary to extend the ink guide hole 27 toward the ball side, resulting in a reduction in the thickness of a part of the tapered portion 25, which easily causes processing defects. Further, in Examples 26 and 29 and Comparative Example 15, there were some cases where a poor force was caused because the Q value was 90 degrees, and for a reason similar to that described above, there was a possibility that a small amount of processing failure occurred. In addition, in other examples and comparative examples, machining defects did not occur at all, or were slight even if they occurred. That is, Comparative Example 12 with a Q value of 25 degrees, Examples 24 and 27 with a Q value of 30 degrees, and a Q value of 60 degrees 62 1238123 玖, description of the invention, known examples 25 and 28, and comparative example 14: Man. 'Compared with Examples 25 and 28 with a Q value of 60 degrees, the value of 0 is 30 ulcers, and Comparative Example 12, Examples 24 and 27 at V and L are processability, and are not due to Q The smaller the value, the part of the conical part 25 can be formed as 5 and 5 P moves both in the mountains and in the same way, so it is not easy to cause aberration. However, as shown in Comparative Example 12

When the Q value is too small, it will hinder the flow of ink and cause the word to be ambiguous. X However, when comparing Example 24 to Example 26 with Examples 27 or% to 29, although the Q value is the same, in terms of high-speed writing, Example 27 to 29 are superior. This is because the R value has been formed to 35 degrees, so even if the P value is formed to 0.5 mm, the thickness of the tapered portion 25 will not be reduced when it is larger than that in Example 24 or 26. The ink flow is smoother. When the above evaluations are combined and taken into consideration, first of all, the comparative example 13 is superior in high-speed writing performance but poor in processability, and Comparative Examples 2 and 14 and 15 have acceptable processability but poor high-speed writing performance. Therefore, the% thermal method achieves the object of the present invention to provide a ballpoint pen tip that is excellent in high-speed writing and easy to process. In addition, Example 24 to 29 series can provide a ball-point pen tip. The 20 ^ 5 Hai ball-point pen tip has no bad evaluation in terms of two-speed writing performance and processability. It has excellent high-speed writing performance and is easy to process. In addition, it can be said that Examples 27 to 29 can provide a ball-point pen tip with more excellent high-speed writing. Moreover, in view of the evaluation of the foregoing Examples 24 to 26, the p value should be 63 1238123 玖, the description of the invention should be 0.4 mm or more, the Q value should be 30 degrees or more and 90 degrees or less, and the R value should be 30 degrees or more. Evaluation of Examples 27 to 29 shows that the R value is particularly preferably 35 degrees or more. (5) Evaluation of the diameter D of the ball, the diameter F of the ink flow hole, the size G of the ball protrusion 5 and the inner diameter Η of the front end of the convergence portion. (5-1) Examples and Comparative Examples

The beads 30 used in the examples and comparative examples are made of cemented carbide, and the ball diameter (D) is 0.25 mm. The holder 20 is made of SUS430 and uses a cylindrical material with an outer diameter of 2.3mm as the material. D, F / D, G / D, and (D-H) in the examples and comparative examples are shown in Table 21 below (however, F is the diameter (mm) of the ink circulation hole 28A, G is a circle The bead protrusion size (mm) and Η are values of the inner diameter (mm) of the front end of the convergence portion.

15 [Table 21] D (mm) F / DG / D DH (mm) Example 30 0.25 0.40 0.35 0.003 Example 31 0.25 0.40 0.23 0.013 Example 32 0.25 0.32 0.32 0.005 Example 33 0.25 0.64 0.32 0.005 Example 34 0.25 0.40 0.32 0.005 Example 35 0.25 0.50 0.32 0.005 Example 36 0.25 0.60 0.32 0.005 64 1238123

发明 Description of invention

In the following description, among the values in the aforementioned Table 21, the F / D value shown in the second column is 0.4 or more and Q.6 or below is referred to as "i-th condition_." Among the values, the ㈣ value shown in the 帛 3 column is 0.25 mm or more, and the (d-h) value shown in the 4th column is 5 or more and ο · 〇10 hereinafter is referred to as "second condition". That is, Example 30, Example 31, and Implementation &lt; Column 34 to Example 39 satisfy the i-th condition. It should be noted that the second condition is satisfied from the thirty-second embodiment to the thirty-ninth embodiment. However, none of Comparative Examples 16 to 19 satisfies the first condition and the second condition.

10 The ballpoint pen tip 10 of each example and each comparative example, as shown in figure n, is incorporated into the same pen body used in the commercially available ballpoint pen 40 (UM_151, Mitsubishi Pencil Co., Ltd.) for writing. The ink containing tube 44 of the ball-point pen 40 is filled with so-called pseudoplastic water-based ink having a composition shown in Table 2 for writing. (5-2) Test items For each of the foregoing examples and comparative examples, the following tests ① to ④ were carried out, and the evaluations were performed as follows. 65 1238123 发明. Description of the invention ① Feeling of irregularity Use a ballpoint pen combined with the examples and comparative examples, a ballpoint pen of 10, to evaluate the feeling of irregularity accompanying the writing by using the functional test of the examiner's actual writing. Specifically, ‘respective reviewers do n’t feel 5 to feel uncomfortable at all, or those who feel that the material does not constitute a degree of impediment are rated as“ A ”, which is a bit difficult in the book« ❹ 丨

Those who have a sense of degree of irregularity are evaluated as "B", and those who feel a significant degree of disturbance at the time of writing are evaluated as "C". ② High-speed writing performance 10 High-speed writing performance uses a writing tester according to ISO standard 14145-1 to write at a speed of 4.5m / min, a writing angle of 60, and a writing load of 0.98N (100g weight). Identify the degree of line breaks

^ Price of materials. Specifically, those who can hardly see the line interruption are evaluated as A ", those who see a slight line interruption are evaluated as rB", and those who can see the line interruption are marked as "C". ③ The change in the bead holding force caused by writing is based on the use of a writing tester in accordance with 〇14145 ”, at a writing speed of 4.5 m / min, a writing angle of 60, and a writing load of 0.98 N (1〇〇 g weight), the evaluation is performed by observing the looseness of the convergence part by writing y 炱. Specifically, the two evaluated the person who could hardly see the loosening of the convergence portion 21 as "eight", the one with looseness in the gradation portion 21 but still holding the ball 30 as "B", and the ball caused by the loosening of the convergence opening 21 30 is rc ". ④Bead subsidence 66 1238123 发明, description of the invention, the subsidence of the bead 30 caused by writing, after writing under the same conditions mentioned above ③, the measurement is made by measuring the reduction of the protruding size of the beads. Specifically, ′ is evaluated as “Α” for those with a reduction in ball protruding size of less than 25_, “b” for those with a size of 25 μίη and less than 35, and rc for those with a size of 35 μm or more. In addition, "in fact, from the foregoing Examples 30 to 39 and from Comparative Examples 16 to 19", the above evaluation items were not evaluated as "%".

(5-3) Review of the first condition 10 The following will review the effect of satisfying the first condition of the "ball tip" 1G, and the case where the second condition is not satisfied and the case where it is satisfied. (5-3-1) Case where the second condition is not satisfied

As shown in Table 22 below, the G / D value and the (D-H) value of Example 30 are the same as those of Comparative Example 16 and Comparative Example 17, but none of them satisfies the condition 2-15. Moreover, compared with Example 30, the first condition was satisfied, and Comparative Example 16 and Comparative Example 17 did not satisfy the first condition. [Table 22]

F / DG / D DH ① (2) ③ ④ Example 30 0.40 0.35 0.003 AABA Comparative Example 16 032 0.35 0.003 ABBA Comparative Example 17 0.64 0.35 0.003 AABB According to the results in Table 22 above, the second condition is not satisfied and the jth condition is satisfied. Example 30 was evaluated as excellent in the comparative example 16 ′ which failed to satisfy the first condition and the second condition in the item of high-speed writing (②). 67 20 1238123 发明 、 Explanation of the invention In comparison with Comparative Example 17, which did not satisfy the first condition and the second condition, it was evaluated as excellent in the item of ball subsidence (④). In addition, as shown in Table 23 below, the G / D value and the (D-H) value of Example 31 are the same as those of Comparative Example 18 and Comparative Example 19. However, neither of them satisfies the second condition. The first condition, Comparative Examples 18 and 19 do not satisfy the first condition. [Table 23] F / DG / DD— Η ① ② ③ ④ Example 31 0.40 0.23 0.013 Β AAA Comparative Example 18 0.32 0.23 0.013 Β BAA Comparative Example 19 _ 0.64 0.23 0.013 Β AA --------- According to the table As a result of Example 23, Example 31, which does not satisfy the second condition and satisfies the first working condition, does not satisfy the i-th condition and the n-th condition.

Comparative example 18 of 10 was evaluated as excellent in the item of high-speed writing (②). Also, compared to Comparative Example 19, in which neither the i-th condition nor the second condition was satisfied, it was evaluated as excellent in the item of the bead subsidence (④). That is, if the conditions of the G / D value and the (D-H) value of the ballpoint pen tip 10 are the same, and when the second condition is not satisfied, 15 lx when the i condition is satisfied can be clearly seen when the first condition is not satisfied. To performance improvement. (5-3-2) When the second condition is satisfied, as shown in Table 24 below, Example 34, Example%, and Example 36 and Example 32 and Example 33 "G / D value and (D-H) value It is common, and both satisfy the second condition. And, with respect to Example 34, Example 35, 20, and Example 36, all satisfy the first! Conditions, Examples% and Examples are all 68 1238123 发明, Description of the Invention The first condition is not satisfied. [Table 24]

------ Example 34 F / D ----- 0.40 G / D 0.32 0.32 DH 0.005 0.005 See Λ-Exempt Example 35 ------. 0.50 AAAAAA Example 3 6 0.60 0.32 0.005 --- --- AAAAA Example 32 0.32 0.32 0.005 A --- BA ------- AAA Example 33 0.64 0.32 0.005 AAAA ----- 1 AB Street is the result of 24, meeting the second condition and meeting the The conditions of Example 34, Example 35, and Example 36 satisfy the second condition but not the second! Condition Example 32 was evaluated as excellent in the items of high-speed writing (②). Furthermore, Example 34, Example 35, and Example 36, which satisfy the second condition and satisfy the first condition, are all subsided with respect to the example 33 which satisfies the second condition but does not satisfy the condition 丨 (④) The items were evaluated as excellent.

That is, the conditions of the G / D value and the (D-H) value are the same, and when the second condition is met, the ballpoint pen tip 10 can be clearly seen when the first condition is met and the second condition is not met. Of promotion. In addition, as shown in Table 25 below, even if the G / D value and the (D-H) value were changed within the range satisfying the second condition, the evaluations of Examples 37 to 39 within the first condition range were equally good. . [Table 25]

F / D G / D D-H ① ② ③ ④ 1 Example 37 0.40 0.25 0.010 A A A A 69! 238123

(5-3-3) Effect of condition l

It can be clearly seen from the results of (5-3-1) and (5-3-2) that regardless of the second condition, when the F / D value is lower than the lower limit (i · 4) of the i condition (Table 22) In Comparative Example 16, Comparative Example 18 in Table 23, and Example 32 in Table 24), the writing performance at a high speed of 5 was reduced. Regardless of the second condition, when the #age value is higher than the upper limit (0.6) of the i-th condition (Comparative Example 17 in Table 22, Comparative Example 19 in Table 23, and Example 33 in Table 24), the ball subsidence increases. That is, the first condition can be said to be an appropriate range of F / D values from the standpoint of deformation of the holder and sinking of the beads. 1〇 (5 · 4) Review of the second condition The effect of the ballpoint pen tip 10 meeting the second condition will be categorized into failure to meet the first condition and the first condition. (5-4-1) When the first condition is not satisfied

As shown in Table 26 below, the F / D values of Example 32 are the same as those of Comparative Example 16 and Comparative Example 18, but none of them satisfies the first condition. Furthermore, Comparative Example 16 and Comparative Example 18 did not satisfy the second condition with respect to Example 32 satisfying the second condition. [Table 26]

F / DG / DD — Η ① ② ③ ④ Implementation Example 3 2 0.32 0.32 0.005 ABAA Comparative Example 16 0.32 0.35 0.003 ABBA Comparative Example 18 0.32 0.23 0.013 BBAA 70 1238123 (2) The results in Table 26 are described in the table. Example 32 which satisfies the condition i and satisfies the 2nd and the 2nd conditions, is relatively excellent in the item of the ball holding force (③), as compared with the case that the conditions 1 and 2 are not satisfied. Compared with Comparative Example 8 in which White condition i and Condition 2 were not satisfied, it was evaluated as excellent in the item with a sense of unsmoothness (①). In addition, as shown in Table 27 below, the F / D values of Example 33 are the same as those of Comparative Example 17 and Comparative Example 19, but they do not satisfy the first working condition. In addition, compared with the known example 33, the second condition is satisfied, Comparative Example 17 and Comparative Example ΐ9 φ 10 [Table 27]

The second condition is not satisfied. F / DG / DD— Η ① ② ③ ④ Example 33 0.64 0.32 0.005 AAAB Comparative Example 17 0.64 0.35 0.003 AABB Comparative Example 19 0.64 0.23 0.013 BAAB According to the results in Table 27 above, the conditions of the first condition are not satisfied but the second condition is satisfied. Example 33 was evaluated as excellent in the item of the bead holding force (③), as compared to Comparative Example 17, which neither satisfied the first condition and the second condition. Moreover, compared with Comparative Examples 19 and 15 in which neither the first condition nor the second condition was satisfied, it was evaluated as excellent in the item of feeling of unsmoothness (①). That is, the conditions of the F / D value of the ballpoint pen tip 10 are the same, and if the first condition is not satisfied, the performance improvement can be clearly seen when the second condition is satisfied than when the second condition is not satisfied. (5-4-2) When the first condition is satisfied, as shown in Table 28 below, Example 34 and Example 37 and Example 71 20 1238123 玖, Invention Description Example 30 and Example 31, F / D values are common and all The i-th condition is satisfied. And, with respect to Example 34 and Example 37, the second condition is satisfied, and

F / DG / D DH ① (2) ③ ④ Example 34 0.40 0.32 0.005 AAAA Example 37 0.40 0.25 0.010 AAAA Example 30 0.40 0.35 0.003 AABA Example 31 0.40 0.23 0.013 BAAA Example 30 and Example 31 did not meet the requirements 2 conditions. [Table 28] _ 5 From the results of the foregoing Table 28, Example 34 and Example 37, which satisfy the first condition and the second condition, are compared to Example 30, which satisfies the first condition and does not satisfy the second condition. It was evaluated as excellent in the item of ball holding force (③). In addition, Example 34 and Example 37 that satisfy the i-th condition and the second condition are all in the item of feeling unsatisfactory (①) compared to the example 31 that satisfies the i-th condition but not the second condition Evaluation was excellent. That is, the conditions of F / D are the same, and when the condition i is satisfied, when the condition 2 is satisfied, the performance of the ballpoint pen tip 10 is clearly seen when the condition 2 is not satisfied. '15 (5-4-3) The effect of the second condition can be clearly seen from the results of the aforementioned (5-4-1) and (5-4 · 2), regardless of the first condition' when the G / D value is lower than Lower limit of the second condition (0 25), and ① HM is higher than the upper limit of the second condition (0.010_hour (Comparative Example 18 of Table%, Comparative Example 19 of Table 27, Example 31 of Table 28) Feeling of unsmoothness 72 1238123 玖, the description of the invention increases. Also, regardless of the first condition, when the G / D value meets the second condition but the value of φ-Η) is lower than the lower limit of the second condition (0.005mm) (Table%) In Comparative Example 16, Comparative Example 17 in Table 27, and Example 30 in Table 28), the ball holding force was reduced. That is, the second condition is considered to be an appropriate range of the G / D value and the (D-H) value from the viewpoint of the feeling of irregularity and the holding power of the ball. (1-5) Summary of evaluation As mentioned above, even when only one of the first condition and the second condition is satisfied, these conditions are less satisfied, and the performance improvement of the ballpoint pen tip 10 can be clearly seen (Table 22, Table 23, Table 26, Table 27). 10 Furthermore, when both the first and second conditions are satisfied, of course, when these conditions are less satisfied, and when only one of these conditions is satisfied, the performance improvement of the ballpoint pen tip 10 can be clearly seen (Table 24, Table 28). That is, the appropriateness of the F / D value range and the appropriateness of the (D-H) value range can be improved from the side of the ballpoint pen tip, respectively, and the performance is improved, and at the same time, when these complement each other and are appropriate, The performance of the ballpoint pen tip 10 can be further improved. EFFECTS OF THE INVENTION Ben Sheming has the structure as described above, so it can exert the effects described below. 20 That is, according to the description of the first invention of the present invention, in a ballpoint pen tip using a small-diameter ball, the amount of deformation required for the formation of the inner protrusion is appropriate ', so as to reduce the ball sinking as much as possible. In addition, according to the description of the second invention of the present invention, in a ballpoint pen tip using a small diameter ball, the amount of deformation required to form the convergence portion is exactly 73 1238123 发明, the description of the invention when 'can effectively prevent the ball Get out. Furthermore, according to the description of the third invention of the present invention, a ballpoint pen tip can be provided, which is a ballpoint pen tip using a small-diameter ball, so that the amount of deformation required for the formation of a large inner side is appropriate, and the convergence is achieved. The amount of deformation required for the shape of the part to be 50% is appropriate, which can reduce the sinking of the ball as much as possible and not easily cause the ball to escape. In addition, according to the description of the fourth invention of the present invention, in a ballpoint pen tip using a small diameter ball and supporting the ball with an inner protrusion, it can solve the bending and ball subsidence caused by the material of the metal thin tube. 10 Also, according to the description of the fifth invention of the present invention, a ball-point pen capable of realizing a smooth writing feeling can be provided. The ball-point pen has a ball-point pen a using a small-diameter ball, and is used for the ball-point pen using a small-diameter ball. ▲ The amount of deformation required to form the inner protrusion is appropriate, and the amount of deformation required to form the convergence portion 21 is appropriate, which can reduce the sinking of the ball as much as possible, and it is not easy to cause the ball to jump. Take off. Furthermore, according to the description of the sixth invention of the present invention, a ball-point pen can be provided. In addition to the effects of the fifth invention, the ball-point pen can be used to limit the ink used to a so-called pseudoplastic water-based ink, which can realize smoother. Writing sense. In addition, a description of the seventh invention of the present invention can provide a ball-point pen nib. When the ball-point pen nib has a small-diameter ball with a ball diameter less than 0.3 mm, especially a ball with a diameter of 0.29 mm or less, the high-speed writing performance is also Excellent 'and easy to process. Furthermore, according to the description of the eighth invention in the present invention, in the ballpoint pen tip with a small diameter of 74 1238123 玖, the ballast pen of the invention description, the cutting amount for forming the ink circulation hole is appropriate, and the ball can be sunk as much as possible The situation is reduced and at the same time sufficient ink supply is ensured. Furthermore, according to the description of the ninth invention of the present invention, in the ballpoint pen center using a small-diameter ball, if the deformation amount required for forming the convergence portion is appropriate, the ball can be effectively prevented from jumping off. In addition, according to the description of the tenth invention of the present invention, a ballpoint pen tip can be provided, which is used in the ballpoint pen tip with a small diameter ball, and the cutting amount for forming the ink circulation hole by using is appropriate, and the convergence part is formed The required amount of deformation is appropriate, which can reduce the sinking of the ball as much as possible, and at the same time ensure sufficient ink supply, and it is not easy to cause the ball to jump off. [Brief Description of the Drawings] FIG. 1 is a front view of a ballpoint pen tip of an i-th embodiment of the present invention. In addition, a holding seat is shown on the wearing surface. Fig. 2 is a front view of the ballpoint pen nib of the first embodiment of the present invention. Fig. 3 is a front view (A) and a cross-sectional view (B) of the front end portion of the ballpoint pen nib of the first embodiment of the present invention. And, the holding seat is shown in cross section at A. Also, "B" shows the state where the beads are removed. Fig. 4 is a front view showing the manufacturing steps of the ballpoint pen nib according to the first embodiment of the present invention. The holding seat is shown in a cross section. Fig. 5 is a front view showing the steps of forming a purple ballpoint pen tip according to the first embodiment of the present invention. The holding seat is shown in a cross section. 1238123 发明 Description of the invention Fig. 6 is a front view showing the manufacturing steps of the ballpoint pen tip according to the first embodiment of the present invention. In addition, the holding seat is displayed on the face. Fig. 7 is a front view showing the manufacturing steps of the ballpoint pen tip according to the first embodiment of the present invention. The holding seat is shown in a cross section. 5 FIG. 8 is a front view showing the manufacturing steps of the ballpoint pen tip according to the first embodiment of the present invention. The holding seat is shown in a cross section. Fig. 9 is a front view showing the manufacturing steps of the ballpoint pen tip according to the first embodiment of the present invention. The holding seat is shown in a cross section. Fig. 10 is a front view showing the manufacturing steps of the ballpoint pen tip according to the first embodiment of the present invention. The holding seat is shown in a cross section. Fig. 11 is a front sectional view of a ballpoint pen incorporating a ballpoint pen tip according to a first embodiment of the present invention. Fig. 12 is a front sectional view of a ballpoint pen incorporating a ballpoint pen tip according to another embodiment of the present invention. 15 FIG. 13 is a front sectional view of a ballpoint pen incorporating a ballpoint pen tip according to another embodiment of the present invention. Fig. 14 is an enlarged front view of a front end portion of a ballpoint pen nib according to a second embodiment of the present invention. The holding seat is shown in a cross section. Fig. 15 is a front view 20 of a ballpoint pen tip according to a second embodiment of the present invention. And ', the holding seat is displayed on the face. The ink guide groove on the inner side is omitted. FIG. 16 is a front view of the ballpoint pen tip of the second embodiment of the present invention. FIG. 17 is a plan view of the front end of the ballpoint pen tip of the second embodiment of the present invention. However, it shows the state where the beads were removed. 76 1238123 发明 Description of the invention Fig. 18 is a front view showing the manufacturing steps of the ballpoint pen tip according to the second embodiment of the present invention. The holding seat is shown in a cross section. Fig. 19 is a front view showing a manufacturing process of a ballpoint pen tip according to a second embodiment of the present invention. The holding seat is shown in a cross section. 5 Fig. 20 is a front view showing the manufacturing steps of the ballpoint pen tip according to the second embodiment of the present invention. The holding seat is shown in a cross section. Fig. 21 is a front view showing a manufacturing process of a ballpoint pen tip according to a second embodiment of the present invention. The holding seat is shown in a cross section. Fig. 22 is an enlarged front view showing a front end portion of the ballpoint pen tip 10 in the manufacturing step of the second embodiment of the present invention. The holder is shown in cross section. Fig. 23 is an enlarged front view showing a front end portion in a manufacturing step of a ballpoint pen tip according to a second embodiment of the present invention. The holder is shown in cross section. 15 FIG. 24 is an enlarged front view showing a front end portion in a manufacturing step of a ballpoint pen tip according to a second embodiment of the present invention. The holder is shown in cross section. [Character table of the main components of the figure] 10. ·· ball-point pen tip 24 ... ball-receiving base 20 ... retaining base 25 ... cone part 21 ... convergence 26 ... Gap 22 ... inner protrusion 27. .. Ink guide hole 22A ... Ink guide groove 28 ... Base 23 ... Bead chamber 28a ... Center hole 1238123 玖, Description of the invention 28A ... Ink circulation hole 29 ... Reduced portion 29A ... Connecting portion 30. .Ball ball 40..ball pen 40A ... ink hole 41 ... connector 42..seal 42A ... diameter reduction hole 43..shaft barrel 43a ... rubber handle 44..ink storage Tube 44a ... Cotton 45 ... Ink 46 ... Ink follower 47 ... Tail plug 48 ... Replacement core 49..Collector 50 ... Xing Kun 51 ... Side wall 52..Bottom surface 70, 80. ..Drill bit… Ball diameter E. ·· Inner diameter of the predetermined size of the holder F. .. Inner diameter of the ink circulation hole G. .. Ball projection size H. .. Inner diameter of the convergence part J, L ... Distance The predetermined distance of the front end of the holder K. The inner diameter of the predetermined size of the reduced portion M ... The inner diameter of the inner peripheral surface of the front end of the tapered portion P ... The maximum diameter of the reduced diameter hole Q ... ... cone angle

78

Claims (1)

1238123 Patent application scope 1. A ballpoint pen nib, which includes: a holder, which is attached to a portion of a thin metal tube near one end, and is deformed by pressing a plurality of equidistant distances from the end inward to form an inner protrusion; The ball is inserted between the inner protrusion and the one end with a diameter of less than 0.3 mm, and the convergence portion is formed by converging the edge of the one end inward, and the diameter of the ball is When D and the diameter of the inscribed circle of the aforementioned inner protrusion is F, the relationship of 0.4SF / DS0.6 is satisfied. 2 · — A kind of ballpoint pen tip, including: a holder, which is near the end of a thin metal tube, and presses and deforms a plurality of equidistant distances from the end to form an inner protrusion: and a ball, which is inserted The diameter between the inner protrusion and the one end is less than 0.2mm, and 5 is formed by converging the edge of the -end inward to form a joint portion, and the diameter of the ball is D and When the direct control of the inscribed circle of the aforementioned inner protrusion is F, the relationship of 0.4 sF / DgG.6 is satisfied. 3. —A kind of ballpoint pen tip, which includes the near part of the tip, and will form the inner protrusion from the shape. The retaining seat is pressed at one end of the thin metal tube at a plurality of distances inward; and 79 1238123, the patent-pending fan ball is inserted between the aforementioned inner protrusion and the aforementioned end with a diameter less than 0.3mm, Furthermore, a joint portion is formed by converging the edge of the one end inward, and the diameter of the ball is D, and the size of the ball protruding from the front end of the convergence portion is G and When the inner diameter of the convergence portion is Η, the relationship of G / Dg 0.25 and 0.005mn ^ Dm0 10mm is satisfied. 4 · A ballpoint pen tip includes: ® Holder is attached to the end of a thin metal tube, and the inner protrusions are formed by pressing and deforming a plurality of equidistant distances from the end toward the inside, and a ball, Insert a diameter of 0.2 mm or less between the inner protrusion and the one end, and form a 15-converged portion by converging the edge of the one end inward, and make the diameter of the ball D D, When the size of the ball protruding from the front end of the joint portion is G and the inner diameter of the convergence portion is η, 0/0 ^ 0.25 and 0.0005111111 $ 0—11 幺 〇〇1〇— The relationship of υ · 〇1〇Ώιη. 5. —A kind of ballpoint pen tip, including: a holder, which is attached to the end of a thin metal tube, and is deformed by pressing a plurality of equidistant distances from the end toward the inside to form a shape with an inner protrusion; and the end Interval diameter The ball is inserted between the inner protrusion and the _ smaller than 0.3mm, 80 20, the scope of patent application, and 'converging part is formed by convergence processing of the edge of the one end inward, and the circle is formed. When the diameter of the bead is D, and the diameter of the inscribed circle of the inner protrusion is F, and the size of the ball protruding from the front end of the convergence portion is G and the inner diameter of the convergence portion is H, Meet the relationship of 0.4 'F / D ^ O.6, G / D-0.25, and HgG side bandit. 6 · — A kind of ballpoint pen tip, including: a holder, which is near the end of a thin metal tube, and presses and deforms a plurality of equidistant distances from the end toward the inside to form an inner protrusion: and a ball, which is inserted The diameter between the inner protrusion and the one end is 0.2 mm or less, and the convergence portion is formed by processing the edge of the one end toward the inside, and the diameter of the two ball seats is D ′ and When the diameter of the inscribed circle of the inner protrusion is F, and the size of the ball from the front end of the convergence portion is G, and the inner diameter of the convergence portion is η, 0.4 $ is satisfied. -6, G / D- 025 and 005mmS D- 001 blood relationship. • The ballpoint pen tip of item 1, 2, 3, 4, 5, or 6 as claimed in the patent application, wherein the thin metal tube is made of stainless steel with a nickel content of 10% by weight or more and a Vickers hardness of 350 or more. • If the ballpoint pen tip of item 7 of the scope of patent application, among which the aforementioned 1238123 does not apply, the scope of the patent application scope is stainless steel with a carbon content of 0.03% by weight or less. 9. _ Vostian iron series stainless steel ballpoint pen tip, Contains a retainer, attached to one end of a thin metal tube ° 'Pressing and deforming a number of places equidistant from the ancient female end inward to form °: and the inner protruding ball is inserted into the aforementioned inner protruding And the above is less than 0.3mm, the diameter between the ends 10 In addition, the aforementioned one has a converging portion, and the end edge is formed by inward converging and processing. The metal thin tube is made of stainless steel with a content of 1G% by weight or more and a Vickers hardness of 350 or more. ί. If the ballpoint pen nib of item 9 of the patent application scope, wherein the aforementioned stainless steel hinders Vostian iron-based non-recording steel with a content of 0.03% by weight or less. 15 11 ’ballpoint pens also have a ballpoint pen tip’ The ballpoint pen tip pack Contains: an ink containing tube for containing ink; a holding seat, which is adjacent to one end of a thin metal tube, presses and deforms a plurality of equidistant distances from the end toward the inside to form an inner protrusion 20; and a ball 'It is inserted between the inner protrusion and the one end whose diameter is less than 0.3mm, and' converging part is formed by agglomerating the edge of the one end inward, 82 1238123 The diameter of the ball seat is D, and the diameter of the inscribed circle of the inner protrusion is F, and the size of the ball protruding from the front end of the convergence portion is G, and the inner diameter of the convergence portion is] In this case, the relationship of 0.4 ^ * F / 1 ^ 0.6, G / D ^ 25 and 005 inm $ D-^ ^ 〇〇〇〇 should be satisfied). 12 &gt; The ballpoint pen also has a ballpoint pen tip, which includes: an ink containing tube for containing ink; and a holding seat, which is located near one end of the thin metal tube and will be equidistant from the 10 end. Those with inner protrusions formed by pressing and deforming inwardly; and beads, which are inserted between the inner protrusion and the one end with a diameter of 0.2 mm or less, and are processed by converging the edge of the one end inward. 15 has a convergence portion, and the diameter of the ball seat is D, and the diameter of the inscribed circle of the inner protrusion · is F, and the size of the ball protruding from the front end of the convergence portion When G is G and the inner diameter of the convergence portion is η, the relationship of 0.4 F / DS 0.6, G / D-0.25, and 0.005 mmg D—Hg 0.001 mm2 2 is satisfied. . 13. The ball-point pen according to item 11 or 2 of the scope of patent application, wherein the ink contained in the aforementioned ink containing tube is a water-based ink, and the viscosity of the water-based ink at a shear rate of 25 ° C MJsec · 1 is 2 〇mPa · sec or more and 600Pa · sec or less, and a shear rate of 83 1238123 at 25 ℃ to pick up 14. 5 10 15 20 15. 16. The viscosity in the patent application range of 384sec is 105 mPa · sec or more and 120 Pa · sec or less. A ballpoint pen nib includes: a ball; and a holder for holding the ball. The holder includes: a ball chamber for receiving and enclosing the ball at one end so as to be able to rotate freely. ·, And Lu ink hole 'is the one through the ball room through the other end of the opposite side of the ball to supply ink to the ball, such as the ink hole, at least: The ink flow hole' is from the ball room to the circle The opposite side of the beads is provided so that the ink flows toward the bead chamber; and the ink guide hole is provided on the opposite side of the beads of the ink circulation hole to introduce the ink toward the ink circulation hole, which is on the side of the ball of the holding seat. In the outer periphery, a ballpoint pen tip with a tapered portion facing the ball side and a small diameter is formed, the outer diameter of the ball is less than 0.3 mm, and the connection between the ink guide hole and the ink circulation hole is a ball. The diameter-reduced hole having a tapered shape on the side is reduced in diameter, the maximum diameter of the diameter-reduced hole is 0.4 mm or more, and the cone angle of the diameter-reduced hole is 30 ° or more and 90 ° or less. For example, the ballpoint pen tip of item 14 of the scope of patent application, the cone angle of the cone part of the aforementioned ball seat in # is more than 35 degrees. A ballpoint pen nib includes: 84 1238123 The patent application fg surrounding cone is formed by cutting the outer periphery of one end of a cylindrical material into a thin head; the ball chamber is formed by cutting the inner periphery of the aforementioned cone 'Ink guide holes are formed by perforating the other end of the cylindrical material to the aforementioned circle. 5 In the vicinity of the bead chamber; Ink circulation holes' are formed by penetrating between the aforementioned bead chamber and the aforementioned ink guide hole, and The ball is smaller than the diameter inserted into the bead chamber. · Three faces, and ······························································································ 借In this case, the 0.4gF / Dg062 relationship is satisfied. 17. —A kind of ballpoint pen tip, including: a cone, which is formed by cutting the outer circumference of one end of a cylindrical material into a thin head to form 15; a ball to 'is formed by cutting the inner periphery of the aforementioned cone; · an ink guide hole, which is formed by The other end of the cylindrical material is perforated to the vicinity of the aforementioned bead chamber; the ink circulation hole is formed by penetrating between the aforementioned bead chamber and the aforementioned ink guide 20 hole; and the bead 'is inserted into the aforementioned bead chamber If the diameter is less than 0.3mm, and the 'joint part is formed by converging the edge of the one end inward, and the diameter of the ball is D, and the ball is made from the converging 85 1238123 When the size of the front end of the joint portion of the patent application range is G and the inner diameter of the convergence portion is Η, the relationship of G / _. 25_05mn ^ Dm0i0mm is satisfied. 18 · A ballpoint pen tip containing: · ♦ The tapered portion is formed by cutting the outer periphery of one end of a cylindrical material into a thin and thin head &amp; &quot; The ball chamber is formed by cutting the inner periphery of the aforementioned tapered portion, and the ink guide The hole is formed by perforating the other end of the cylindrical material to the vicinity of the aforementioned bead chamber; the ink circulation hole is formed by penetrating between the aforementioned bead chamber and the aforementioned ink guide hole; and the ball is inserted into the aforementioned circle If the diameter in the bead chamber is less than 0.3mm, and a convergence portion is formed by converging the edge of the one end inward, and the diameter of the ball is D, and the ball is converged by the aforesaid When the size of the front end of the joint portion is 0 and the inner diameter of the convergence portion is Η, the relationship of 0.4SF / Dg0.6, G / D ^ 25, and 0.05mm $ D_H $ 0.010mm is satisfied. Pan 钃 86