Patent Publication Number: US-2022219481-A1

Title: Pen

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is the United States national phase of International Application No. PCT/JP2020/020730 filed May 26, 2020, and claims priority to Japanese Patent Application No. 2019-101377 filed May 30, 2019, the disclosure of which are hereby incorporated by reference in their entirety. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a pen used as a writing instrument or a makeup instrument. 
     Description of Related Art 
     A conventional pen used as a writing instrument or a makeup instrument includes an ink reservoir that stores an ink, and a pen tip section, to which the ink is supplied from the ink reservoir, for applying the ink to an ink application object. 
     There are various types of the ink reservoir. One of the various types of the ink reservoir includes a tubular casing member having liquid blocking properties and a cotton body having liquid absorption properties filled in the casing member (see, for example, Patent Literature 1). 
     In this type of ink reservoir, the casing member has a first opening end and a second opening end opposite to the first opening end in a direction in which the center axis of the casing member (its center axis) extends (this direction will be hereinafter referred to as the axial direction of the pen). The casing member is disposed with the first opening end facing the pen tip section. 
     The cotton body includes multiple fibers each having a length shorter than the entire length of the casing member in the axial direction of the pen. The multiple fibers are entangled with each other in the casing member to form minute spaces among the fibers. With this configuration, the ink is held among the fibers (in the minute spaces) and supplied to the pen tip section by the capillary action. 
     Thereby, this type of pen that causes the pen tip section to be brought into contact with the ink application target can continuously apply the ink to the ink application target. 
     Meanwhile, some of this type of pen include an ink reservoir that stores an ink including decorative particles having reflectivity or glossiness. According to such a pen, the decorative particles included in the ink are together applied to the application target when the ink is applied to the application target. Accordingly, decorativeness of the application target applied with the ink is enhanced. 
     However, the amount of supply of decorative particles to the pen tip section in this type of pen is reduced as the pen is being used. Specifically, since the multiple fibers forming the cotton body of the ink reservoir have a length shorter than the entire length of the casing member, this type of pen has ends (end faces) of the fibers at multiple locations. 
     Therefore, the decorative particles included in the ink caught by the end faces of the fibers in the casing member when the ink is supplied to the pen tip section cannot reach the pen tip section. 
     Accordingly, this type of pen has a problem in that the number of decorative particles applied to the application target is reduced compared with the beginning of the use since the amount of supply of the decorative particles to the pen tip section is reduced as the pen is being used. 
     CITATION LIST 
     Patent Literature 
     
         
         Patent Literature 1: JP 2005-342950 A 
       
    
     SUMMARY OF THE INVENTION 
     Technical Problem 
     It is therefore an object of the present invention to provide a pen capable of enabling, even for an ink including decorative particles, a stable supply of the ink together with the decorative particles to a pen tip section. 
     Solution to Problem 
     The pen as an embodiment of the present invention includes: an ink reservoir that stores an ink including decorative particles; and a pen tip section to which the ink is supplied from the ink reservoir; the ink reservoir including a tubular casing member having liquid blocking properties, and an ink occlusion material disposed inside the casing member; the casing member having a first opening end and a second opening end opposite to the first opening end in a direction in which a center axis of the casing member extends, in which the first opening end is disposed to face the pen tip section; the ink occlusion material including multiple fibers disposed inside the casing member; the multiple fibers respectively having one ends disposed at a position corresponding to the first opening end or the second opening end of the casing member; and the multiple fibers respectively having other ends disposed at a position corresponding to the first opening end or the second opening end of the casing member. 
     As one form of the present invention, it may be configured such that the multiple fibers extend in the same direction as that of the center axis of the casing member, the one ends of the multiple fibers are disposed at the position corresponding to the first opening end, and the other end of the multiple fibers are disposed at the position corresponding to the second opening end. 
     Specifically, since the multiple fibers extend in the same direction as that of the center axis of the casing member, minute spaces formed among the fibers extend in the same direction as that of the center axis of the casing member. That is, the minute spaces formed among the fibers extend along the fibers. 
     Effect 
     As described above, the present invention can produce an excellent effect of enabling, even for an ink including decorative particles, a stable supply of the ink together with the decorative particles to the pen tip section. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an appearance view of a pen according to an embodiment of the present invention. 
         FIG. 2  is a cross-sectional view of the pen according to the embodiment taken along a line II-II in  FIG. 1 . 
         FIG. 3  is a cross-sectional view of the pen according to the embodiment taken along a line II-II in  FIG. 1 , in which a cap is removed from a pen body. 
         FIG. 4  is a cross-sectional view of an ink reservoir included in the pen according to the embodiment as viewed from a direction orthogonal to a direction in which a center axis of a casing member extends. 
         FIG. 5  is a partial enlarged cross-sectional view of the ink reservoir included in the pen according to the embodiment as viewed from the direction in which the center axis of the casing member extends. 
         FIG. 6  is a partial enlarged view of the pen according to the embodiment, specifically an enlarged view of a VI area in  FIG. 3 . 
         FIG. 7  is a partial enlarged cross-sectional view of the ink reservoir included in the pen according to the embodiment taken along a line VII-VII in  FIG. 5  with a schematic illustration of flow of ink. 
         FIG. 8  is a cross-sectional view of the ink reservoir included in a pen according to another embodiment as viewed from a direction orthogonal to a direction in which a center axis of a casing member extends. 
         FIG. 9  is a cross-sectional view of the ink reservoir included in a pen according to still another embodiment as viewed from a direction orthogonal to a direction in which a center axis of a casing member extends. 
     
    
    
     DESCRIPTION OF THE INVENTION 
     Hereinafter, an embodiment of the present invention will be described with reference to the attached drawings. 
     As shown in  FIG. 1  to  FIG. 3 , the pen according to this embodiment includes a pen body  2  that includes a pen tip section  21  that applies an ink to an ink application target (see  FIG. 2  and  FIG. 3 ) and a cap  3  that covers the pen tip section  21  of the pen body  2 . 
     As shown in  FIG. 2  and  FIG. 3 , the pen body  2  includes an ink reservoir  20  that stores an ink including decorative particles (hereinafter simply referred to as the ink) and the pen tip section  21  to which the ink is supplied from the ink reservoir  20 . 
     More specifically, the pen body  2  includes the ink reservoir  20  that stores the ink, the pen tip section  21  to which the ink is supplied from the ink reservoir  20 , an ink guide part  22  that guides the ink from the ink reservoir  20  to the pen tip section  21 , an outer covering  23  forming an outer shell of the pen body  2 , and a holder  24  that holds the pen tip section  21 . The outer covering  23  is configured to house the ink reservoir  20  and the ink guide part  22 . The holder  24  is attached to the outer covering  23 . In this embodiment, the ink includes a montmorillonite-based thickener. The decorative particles included in the ink employed herein are composed of, for example, glass, mineral, metal, fiber, or resin in fine powder form, fine particulate form, or fine flake form. In this embodiment, the decorative particles included in the ink have reflectiveness or glossiness. More specifically, glass formed into a scale form (so-called glass flakes) is employed as the decorative particles included in the ink. With this configuration, the decorative particles reflect the light like a glittering material to enhance the decorativeness, and thus the ink according to this embodiment is also referred to as an ink with glitter. 
     As shown in  FIG. 4 , the ink reservoir  20  includes a tubular casing member  200  having liquid blocking properties and an ink occlusion material  201  disposed inside the casing member  200 . 
     The casing member  200  has a first opening end OP 1  disposed on one end side in a direction in which a center axis CL of the casing member  200  (hereinafter referred to as the axial direction of the pen) extends, and a second opening end OP 2  disposed on the other end side opposite to the first opening end OP 1 . The casing member  200  is disposed to have the first opening end OP 1  facing the pen tip section  21  (see  FIG. 3 ). As the casing member  200 , a resin material molded into a tubular shape or a resin film material formed into a tubular shape can be employed. In this embodiment, a resin film material formed into a tubular shape is employed as the casing member  200 . 
     The ink occlusion material  201  includes multiple fibers  202  disposed inside the casing member  200 . Chemical fibers such as polyester fibers or acetate fibers, and natural fibers can be employed as the fibers  202 . In this embodiment, polyester fibers subjected to crimping process are employed as the fibers  202 . Note that the crimping process herein means a process to impart a crimp (a twist) to the fibers. 
     The multiple fibers  202  respectively have one ends disposed at a position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 . Also, the multiple fibers  202  respectively have other ends disposed at a position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 . 
     In this embodiment, the multiple fibers  202  are set to have a length equal to or substantially equal to the entire length of the casing member  200  (i.e., the length of the casing member  200  in the axial direction of the pen) and extend in the same direction as the center axis CL of the casing member  200 . In this embodiment, the multiple fibers  202  extend straight or substantially straight in the axial direction of the pen. With this configuration, one ends of the multiple fibers  202  are disposed at the position corresponding to the first opening end OP 1 , and the other ends of the multiple fibers  202  are disposed at the position corresponding to the second opening end OP 2 . 
     The multiple fibers  202  are held in a bundle form and densely disposed inside the casing member  200 . With this configuration, minute spaces  203  which the ink enters are formed among the fibers  202 , as shown in  FIG. 5 . That is, the minute spaces  203  are formed by a plurality of fibers  202  present around the minute spaces  203 . With this configuration, the minute spaces  203  are formed along the fibers  202 . That is, the minute spaces  203  are formed along the entire length of the ink reservoir  20  in the axial direction of the pen. 
     A size of the minute spaces  203  as viewed from the axial direction of the pen is set to be larger than a maximum particle size d of the decorative particles P included in the ink. The size of the minute spaces  203  formed among the fibers  202  is determined according to an outer diameter D of the fibers  202  that forms the ink occlusion material  201 . 
     Specifically, in a state where the multiple fibers are bundled in a dense state, adjacent fibers  202 ,  202  are held in line contact with each other so that the fibers  202  in line contact with each other define the minute spaces  203 . That is, the plurality of fibers  202  are present around the minute spaces  203 . At the same time, there are a plurality of contact lines L through which each adjacent fibers  202 ,  202  among the plurality of fibers  202  are in contact with each other. The distance between each adjacent ones of the contact lines L around the minute spaces  203  is determined according to the outer diameter D of the fibers  202 . 
     That is, there is such a relationship that the larger the diameter D of the fibers  202 , the wider the distance between the contact lines L, L adjacent to each other around the minute spaces  203 , and the smaller the diameter D of the fibers  202 , the smaller the distance between the contact lines L, L adjacent to each other around the minute spaces  203 . 
     The distance between each adjacent ones of the contact lines L, L is a width W of planes or curves that form peripheries to define the minute spaces  203 . Accordingly, the larger the diameter D of the fibers  202 , the larger the size of the minute spaces  203 , and the smaller the diameter D of the fibers  202 , the smaller the size of the minute spaces  203 . 
     Accordingly, the diameter D of the fibers  202  is determined according to the particle size d of the decorative particles P included in the ink. Note that the actual shape of the cross section of the fibers  202  may not be a circle, but the cross section of the fibers  202  is herein schematically illustrated as a perfect circle. 
     As shown in  FIG. 6 , the pen tip section  21  has a proximal end to which the ink of the ink reservoir  20  is supplied, and a distal end opposite to the proximal end and configured to be brought into contact with the ink application target. The pen tip section  21  according to this embodiment includes an ink through hole  210  penetrating from the proximal end to the distal end. 
     More specifically, the pen tip section  21  has a rod shaped appearance. Accordingly, one end in an axial direction of the pen tip section  21  is the proximal end to which the ink of the ink reservoir  20  is supplied, and the other end in the axial direction of the pen tip section  21  is the distal end that is brought into contact with the ink application target. 
     The pen tip section  21  of this embodiment is formed by subjecting a resin material (plastic in this embodiment) to an injection molding to thereby mold the resin material into a hollow rod shape (i.e., tubular shape) having the ink through hole  210  extending through the center of the pen tip section  21 . 
     The ink through hole  210  of the pen tip section  21  extends in the axial direction of the pen tip section  21  (i.e., the axial direction of the pen). The ink through hole  210  of the pen tip section  21  is set to have such a size as to enable the decorative particles P included in the ink to move therethrough in the axial direction of the pen. That is, the ink through hole  210  of the pen tip section  21  is set to be larger than the maximum particle size d of the decorative particles P included in the ink and formed along the entire length in the axial direction of the pen of the pen tip section  21 . Accordingly, the ink through hole  210  of the pen tip section  21  is opened at one end face and the other end face in the axial direction of the pen. 
     A plurality of protrusions (not shown) protruding toward the center from an inner peripheral wall defining the ink through hole  210  are located at intervals in a circumferential direction in the pen tip section  21 . Thereby, spaces are formed between the protrusions to serve as minute gaps so that the ink is supplied to the pen tip section  21  (i.e., the pen tip) by the capillary action of the gaps. 
     The ink guide part  22  has a proximal end to which the ink is supplied from the ink reservoir  20 , and a distal end opposite to the proximal end. The ink guide part  22  according to this embodiment includes an ink through hole  220  penetrating from the proximal end to the distal end. 
     More specifically, the ink guide part  22  has a rod shaped appearance. Accordingly, one end in an axial direction of the ink guide part  22  is the proximal end to which the ink of the ink reservoir  20  is supplied, and the other end in the axial direction of the ink guide part  22  is the distal end that is connected to the pen tip section  21 . 
     The ink through hole  220  of the ink guide part  22  extends in the axial direction of the ink guide part  22  (i.e., the axial direction of the pen). The ink through hole  220  of the ink guide part  22  is set to have such a size as to enable the decorative particles P included in the ink to move therethrough in the axial direction of the pen. That is, the ink through hole  220  of the ink guide part  22  is set to be larger than the maximum particle size d of the decorative particles P included in the ink and formed along the entire length in the axial direction of the pen of the ink guide part  22 . Accordingly, the ink through hole  220  of the ink guide part  22  is opened at one end face and the other end face in the axial direction of the pen. 
     In this embodiment, the ink guide part  22  includes a plurality of slits  221  disposed at intervals in the peripheral direction in a given area including the one end. The plurality of slits  221  extend in the axial direction of the pen and extend through the ink guide part  22  in a radial direction to be in communication between the inside and the outside of the ink guide part  22 . The ink guide part  22  is thereby configured to enable the ink to flow into the ink through hole  220  not only from the opening at the one end face but also from the plurality of slits  221 . 
     A plurality of protrusions (not shown) protruding toward the center from an inner peripheral wall defining the ink through hole  220  are located at intervals in a circumferential direction in the ink guide part  22 . Thereby, spaces are formed between the protrusions to serve as minute gaps so that the ink is supplied to the ink guide part (i.e., the pen tip) by the capillary action of the gaps. 
     In this embodiment, the ink guide part  22  is formed continuously and integrally with the pen tip section  21 . That is, the outer shape of the ink guide part  22  and the hole shape of the ink through hole  220  are respectively set to be the same as the outer shape of the pen tip section  21  and the hole shape of the ink through hole  210 , and the distal end of the ink guide part  22  is connected to the proximal end of the pen tip section  21 . Thereby, the ink through hole  210  of the pen tip section  21  and the ink through hole  220  of the ink guide part  22  are continuous with each other. The proximal end side of the ink guide part  22  is inserted into the ink occlusion material  201  of the ink reservoir  20 . 
     Returning to  FIG. 3 , the outer covering  23  includes a tubular barrel  230  having one end and the other end opposite to the one end, and a tail part  231  that closes the one end of the barrel  230 . The ink reservoir  20  is housed in the barrel  230  with its center axis coaxially or substantially coaxially with the center axis CL of the casing member  200 . 
     As shown in  FIG. 6 , the holder  24  includes a through hole  240  through which the pen tip section  21  is inserted, that is, through which the pen tip section  21  is inserted to have a tip side extending to the outside. In this embodiment, the pen tip section  21  and the ink guide part  22  are integrally molded so that the pen tip section  21  and the ink guide part  22  are inserted through the through hole  240  of the holder  24 . 
     More specifically, the holder  24  includes a large diameter tubular part  241  and a small diameter tubular part  242  that has an outer diameter smaller than that of the large diameter tubular part  241  and is continuous with the large diameter tubular part  241 . 
     The large diameter tubular part  241  has a circular truncated cone shaped appearance and has a large diameter end face and a small diameter end face at the positions at which they face each other in the axial direction of the pen. The small diameter tubular part  242  is coaxially connected to the large diameter end face of the large diameter tubular part  241 . 
     The large diameter end face of the large diameter tubular part  241  is set to have a diameter larger than the other end opening of the barrel  230  of the outer covering  23 . The outer diameter of the small diameter tubular part  242  is set to be substantially equal to the other end opening of the barrel  230  of the outer covering  23 . Accordingly, the small diameter tubular part  242  is pressed into the other end opening of the barrel  230  of the outer covering  23 , thereby the holder  24  is attached to the outer covering  23  with the large diameter end face of the large diameter tubular part  241  contacting the other end of the barrel  230 . 
     The diameter of an inner hole of the large diameter tubular part  241  corresponds to an outer diameter of the pen tip section  21 . In contrast, the diameter of an inner hole of the small diameter tubular part  242  corresponds to an outer diameter of the ink guide part  22 . The inner hole of the large diameter tubular part  241  and the inner hole of the small diameter tubular part  242  are coaxially continuous with each other. 
     That is, the inner hole of the large diameter tubular part  241  and the inner hole of the small diameter tubular part  242  that are continuous with each other thus form the through hole  240  into which the pen tip section  21  and the ink guide part  22  that are integrally molded are inserted. Thereby, the pen tip section  21  and the ink guide part  22  are held by the holder  24  while being inserted through the through hole  240 . 
     As described above, the pen  1  according to this embodiment includes the ink reservoir  20  that stores the ink including the decorative particles P, and the pen tip section  21  to which the ink is supplied from the ink reservoir  20 . The ink reservoir  20  includes the tubular casing member  200  having liquid blocking properties, and the ink occlusion material  201  disposed inside the casing member  200 . The casing member  200  has the first opening end OP 1  on one end side in the axial direction of the pen, and the second opening end OP 2  on the other end side opposite to the first opening end OP 1 . The casing member  200  is disposed to have the first opening end OP 1  facing the pen tip section  21 . The ink occlusion material  201  includes the multiple fibers  202  disposed inside the casing member  200 . The multiple fibers  202  respectively have one ends disposed at a position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 . The multiple fibers  202  respectively have the other ends disposed at the position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 . 
     According to the pen  1  having the aforementioned configuration, the ink including the decorative particles P is occluded (stored) by the ink occlusion material  201  without leaking to the outside since the ink reservoir  20  includes the tubular casing member  200  having liquid blocking properties and the ink occlusion material  201  disposed inside the casing member  200 . 
     The ink occluded by the ink occlusion material  201  is supplied to the pen tip section  21  as the ink at the pen tip section is being consumed. That is, the ink at the pen tip section  21  is consumed due to the application of the ink to the ink application target, but the ink including the decorative particles P occluded by the ink occlusion material  201  is supplied to the pen tip section  21 . 
     In the ink occlusion material  201  of the pen having the aforementioned configuration, there is no end face of the fibers  202  in a middle portion inside the casing member  200  in the axial direction of the pen, that is, in a portion between the first opening end OP 1  and the second opening end OP 2  since the one ends of the multiple fibers  202  are disposed at the position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 , and the other ends of the multiple fibers  202  included in the ink occlusion material  201  are disposed at the position corresponding to the first opening end OP 1  or the second opening end OP 2  of the casing member  200 . 
     Therefore, when the ink is supplied to the pen tip section  21 , the entire ink including the decorative particles P can move from the second opening end OP 2  side toward the first opening end OP 1  side of the casing member  200 , while the decorative particles P included in the ink are not caught by end faces of the fibers  202  in a middle portion of the casing member as shown in  FIG. 7 . Accordingly, the entire ink including the decorative particles P is supplied to the pen tip section  21 . That is, the reduction in the amount of the decorative particles P supplied to the pen tip section  21  can be suppressed during the supply of the ink to the pen tip section  21 . 
     Thereby, the decorative particles P included in the ink can be stably applied to the ink application target during the use of the pen  1  (i.e., when the ink is applied to the ink application target). 
     Further, the entire ink including the decorative particles P smoothly moves (flows) toward the pen tip section  21  since, in this embodiment, the multiple fibers  202  extend in the same direction as that of the center axis CL of the casing member  200 , the one ends of the multiple fibers  202  are disposed at the position corresponding to the first opening end OP 1 , and the other ends of the multiple fibers are disposed at the position corresponding to the second opening end OP 2 . 
     Specifically, since the multiple fibers  202  extend in the same direction as that of the center axis CL of the casing member  200 , the minute spaces formed among the fibers  202  extend in the same direction as that of the center axis CL of the casing member  200 . That is, the minute spaces  203  formed among the fibers  202  extend along the fibers  202 . 
     Thereby, the entire ink including the decorative particles P smoothly moves (flows) from the second opening end OP 2  side toward the first opening end OP 1  side of the casing member  200 . Accordingly, the stable supply of the ink to the pen tip section  21  is enabled so that the decorative particles P included in the ink are stably applied to the ink application target during the use of the pen  1  (i.e., when the ink is applied to the ink application target). 
     The present invention is not limited to the aforementioned embodiment and appropriate modifications can be made without departing from the gist of the present invention. 
     Although not specifically mentioned in the aforementioned embodiment, the pen  1  having the aforementioned configuration may be a pen as a makeup instrument used for makeup or may be a pen as a writing instrument (stationery) for writing. 
     In the aforementioned embodiment, the multiple fibers  202  are set to have a length corresponding to the entire length of the casing member  200  in the axial direction of the pen, and respectively disposed to have the one ends corresponding to the first opening end OP 1  and the other ends corresponding to the second opening end OP 2 , but the present invention is not limited thereto. For example, it can be configured such that the fibers  202  are turned back at least at one place, and the fibers  202  respectively have both ends located at the positons respectively corresponding to the first opening end OP 1  or the second opening end OP 2 . In this case, there is no need to arrange the multiple fibers  202  in the same form. For example, the fibers  202  turned back at least at one place and the fibers  202  extending straight without being turned back can be mixed in the multiple fibers  202  forming the ink occlusion material  201 . That is, any forms can be employed as long as both ends (i.e., the end faces) of the fibers  202  are not located in a middle portion of the casing member  200 . 
     Also in this case, it is a matter of course that, in order to enable the smooth flow of the ink, the fibers  202  extend in the axial direction of the pen between the first opening end OP 1  and the second opening end OP 2  of the casing member  200  (i.e., the length direction of the fibers is parallel to the axial direction of the pen) in the same manner as the aforementioned embodiment. 
     In the case where the fibers  202  are turned back at least at one place, it is preferable that each of the folded portions at which the fibers  202  are turned back be disposed at the position corresponding to the opening end (the first opening end OP 1  or the second opening end OP 2 ) of the casing member  200 . 
     In particular, in a case where the fibers  202  are folded into two (turned back at one place), it is preferable that the both ends of the fibers  202  be disposed at the position corresponding to the first opening end OP 1  on the pen tip section  21  side, and the folded portion formed at one place be disposed at the position corresponding to the second opening end OP 2 . 
     In the aforementioned embodiment, the multiple fibers  202  extend straight or substantially straight in the axial direction of the pen and are respectively disposed to have the one ends corresponding to the first opening end OP 1  and the other ends corresponding to the second opening end OP 2 , but the present invention is not limited thereto. For example, as shown in  FIG. 8 , it can be configured such that the multiple fibers  202  extend in the axial direction of the pen, and all the multiple fibers  202  are bundled into a group and twisted into a spiral shape about a reference line extending in the axial direction of the pen. Also in this case, the one ends of the multiple fibers  202  are disposed at the position corresponding to the first opening end OP 1 , and the other ends of the multiple fibers  202  are disposed at the position corresponding to the second opening end OP 2 . 
     As shown in  FIG. 9 , it also can be configured that the multiple fibers  202  extend in the axial direction of the pen and are bundled into groups, each of which includes a certain number of fibers, and each of the groups of fibers is twisted into a spiral shape about a reference line extending in the axial direction of the pen. Also in this case, the one ends of the multiple fibers  202  are disposed at the position corresponding to the first opening end OP 1 , and the other ends of the multiple fibers  202  are disposed at the position corresponding to the second opening end OP 2 . 
     According to these configurations, the minute spaces  203  among the fibers  202  are formed in a spiral shape extending in the axial direction of the pen. That is, the minute spaces  203  among the fibers  202  are formed in a spiral shape along the entire length of the casing member  200  in the axial direction of the pen. Thereby, the entire ink smoothly moves (flows) from the second opening end OP 2  side toward the first opening end OP 1  side of the casing member  200  through spiral passages. Accordingly, the stable supply of the ink to the pen tip section  21  is enabled so that the decorative particles P included in the ink can be stably applied to the ink application target during the use of the pen  1  (i.e., when the ink is applied to the ink application target). 
     In the aforementioned embodiment, the pen tip section  21  and the ink guide part  22  are integrally formed with each other, and thereby the ink through holes  210 ,  220  thereof are formed in a continuous tubular shape, but the present invention is not limited thereto. For example, in the case where the pen tip section  21  and the ink guide part  22  are integrally formed with each other, at least one ink through groove extending in the axial direction of the pen can be formed on the outer circumference instead of the ink through holes  210 ,  220 . This configuration enables the ink including the decorative particles P to be guided by the ink through groove and supplied to the pen tip of the pen tip section  21 . 
     In this case, the ink through groove can be widened from the center side toward the circumferential side or can be formed with the same width from the center side toward the circumferential side. Further, in a case where a plurality of ink through grooves are disposed in the pen tip section  21  and the ink guide part  22 , the plurality of ink through grooves can be located at uniform intervals around the pen tip section  21  and the ink guide part  22 , or can be located at non-uniform intervals around the pen tip section  21  and the ink guide part  22 . 
     In the aforementioned embodiment, the pen tip section  21  and the ink guide part  22  are integrally formed with each other, but the present invention is not limited thereto. For example, the pen tip section  21  and the ink guide part  22  can be formed as separate parts. Needless to say, however, it is configured such that the ink from the ink guide part  22  can be transferred to the pen tip section  21 . 
     The pen according to one embodiment of the present invention includes an ink reservoir that stores an ink including decorative particles; and a pen tip section to which the ink is supplied from the ink reservoir; the ink reservoir including a tubular casing member having liquid blocking properties, and an ink occlusion material disposed inside the casing member; the casing member having a first opening end and a second opening end opposite to the first opening end in a direction in which a center axis of the casing member extends, in which the first opening end is disposed to face the pen tip section; the ink occlusion material including multiple fibers disposed inside the casing member; the multiple fibers respectively having one ends disposed at a position corresponding to the first opening end or the second opening end of the casing member; and the multiple fibers respectively having other ends disposed at a position corresponding to the first opening end or the second opening end of the casing member. 
     According to the aforementioned configuration, the ink including the decorative particles is occluded (stored) by the ink occlusion material without leaking to the outside since the ink reservoir includes the tubular casing member having liquid blocking properties and the ink occlusion material disposed inside the casing member. 
     The ink occluded by the ink occlusion material is supplied to the pen tip section as the ink at the pen tip section is being consumed. That is, the ink at the pen tip section is consumed due to the application of the ink to the ink application target, but the ink including the decorative particles occluded by the ink occlusion material is supplied to the pen tip section. 
     In the ink occlusion material of the pen having the aforementioned configuration, there is no ends (i.e., no end faces) of the fibers in a middle portion inside the casing member in a direction in which the center axis of the casing member extends, since the one ends of the multiple fibers are disposed at the position corresponding to the first opening end or the second opening end of the casing member, and the other ends of the multiple fibers are disposed at the position corresponding to the first opening end or the second opening end of the casing member. 
     Therefore, when the ink is supplied to the pen tip section, the entire ink including the decorative particles can move from the second opening end side toward the first opening end side of the casing member, while the decorative particles included in the ink are not caught by end faces of the fibers in a middle portion of the casing member. That is, the reduction in the amount of the decorative particles supplied to the pen tip section can be suppressed during the supply of the ink to the pen tip section. 
     Thereby, the decorative particles included in the ink can be stably applied to the ink application target during the use of the pen (i.e., when the ink is applied to the ink application target). 
     As one form of the present invention, it can be configured such that the multiple fibers extend in the same direction as that of the center axis of the casing member, the one ends of the multiple fibers are disposed at the position corresponding to the first opening end, and the other ends of the multiple fibers are disposed at the position corresponding to the second opening end. 
     This configuration enables the entire ink including the decorative particles to smoothly move (flow) toward the pen tip section. 
     Specifically, since the multiple fibers extend in the same direction as that of the center axis of the casing member, the minute spaces formed among the fibers extend in the same direction as that of the center axis of the casing member. That is, the minute spaces among the fibers are formed along the fibers. 
     Thereby, the entire ink smoothly moves (flows) from the second opening end side toward the first opening end side of the casing member. Accordingly, the stable supply of the ink to the pen tip section is enabled so that the decorative particles included in the ink are stably applied to the ink application target during the use of the pen (i.e., when the ink is applied to the ink application target). 
     As described above, the pen according to one form of the present invention can produce an excellent effect of enabling, even for the ink including the decorative particles, the stable supply of the ink including the decorative particles. 
     REFERENCE SIGNS LIST 
     
         
           1 : Pen 
           2 : Pen body 
           3 : Cap 
           20 : Ink reservoir 
           21 : Pen tip section 
           22 : Ink guide part 
           23 : Outer covering 
           24 : Holder 
           200 : Casing member 
           201 : Ink occlusion material 
           202 : Fiber 
           203 : Minute space 
           210 : Ink through hole 
           220 : Ink through hole 
           221 : Slit 
           230 : Barrel 
           231 : Tail part 
           240 : Through hole 
           241 : Large diameter tubular part 
           242 : Small diameter tubular part 
         D: Outer diameter 
         d: Particle size 
         L: Contact line 
         OP 1 : First opening end 
         OP 2 : Second opening end 
         P: Decorative particles 
         W: Width