COSMETIC PRODUCT APPLICATOR

Abstract

We offer a cosmetic product applicator with which eyelashes can be increased in volume and curled.[Means of solution] The cosmetic product applicator includes an application portion (8) consisting of a linear core wire portion (18) formed with a pair of metal core wires (18a) twisted helically together, and a number of bristles (20) pinched by a twisted portion of the core wires (18a) and continuing helically in an axial direction of the core wire portion while extending radially, wherein the application portion (8) has an external shape that is a substantially predetermined polygonal shape, all of whose internal angles are within the range of 180 degrees in cross-section at any position in an axis direction (X) of the core wire portion and which continues in a circumferential direction while rotating around the axis (X) of the core wire portion as it advances in the direction of the axis (X) of the part of the soul thread.

Description

[0019] First embodiment The preferred embodiments of a cosmetic product applicator and a method for manufacturing the latter according to the present invention are described below with reference to the drawings.

[0020] As shown in Figure 1, a cosmetic mascara product 1 comprises a liquid mascara container 10 which contains a liquid mascara 16 and a cosmetic product applicator 2 which can be mounted on a reduced diameter part 12 of the liquid mascara container 10.

[0021] The cosmetic product applicator 2 comprises a cap 4, a base stem 6, and a cosmetic product brush 19. The cosmetic product brush 19 comprises a core wire portion 18 and an application portion 8. In the application portion 8, from a twisted portion of the twisted core wires 18a (hereinafter referred to as the core wire portion 18), the bristles 20, pinched by the core wire portion 18, extend radially at regular intervals in a circumferential direction around the core wire portion 18, and extend regularly in a helical fashion in an axial direction of the core wire portion 18. A base stem portion 18b of the core wire portion 18 is mounted in a hole 6b provided in the base stem 6, and the base stem 6 and the cosmetic brush 19 are joined together. The cap 4 of the cosmetic applicator 2, which is screwed onto the liquid mascara container 10, is joined to a cylindrical base end portion 6a having an increased diameter of the base stem 6.

[0022] The liquid mascara container 10 is a cylinder with a bottom, its upper end portion being reduced in diameter, and an opening is formed at one upper end of this reduced-diameter portion 12. A wiper 14 is fitted by clamping and fixed onto an inner circumference. A male thread is provided on an external circumferential surface of the reduced-diameter portion 12, and a female thread is provided on an inner circumference of the lower portion of the cap 4 to allow the cap 4 to be screwed onto the reduced-diameter portion 12 of the liquid mascara container 10.A wiper 14, arranged on an inner circumference of the reduced-diameter portion 12, is formed with a cylindrical body made of rubber or plastic, and its lower wall is open. When the cosmetic applicator 2 is removed from the liquid mascara container 10, the base 6 and the cosmetic brush 19 are removed, and the application portion 8 is pushed out, scraping off any excess liquid mascara 16 adhering to the application portion 8. The cosmetic applicator 2 can freely move in and out of the liquid mascara container 10, and a user grasps the cap 4 and applies the liquid mascara 16 to the eyelashes. In a state where the liquid mascara container 10 and the cap 4 are screwed together, the application portion 8 is positioned slightly higher than the lower part of the liquid mascara container 10.

[0023] Shape of the application part As shown in Figures 2, an external form of the application part 8 consists of a surface 34 on one side of the base stem, a surface 36 on one side of the tip end, and five surfaces (22, 24, 26, 28, and 30). The five surfaces (22, 24, 26, 28, and 30) are helical surfaces that extend along a central axis X of the core wire part 18 while rotating about the central axis X, and the surfaces from surface 34, as the surface on the side of the base end of the application part 8, to surface 36 on the side of the tip end, have the same angle of rotation (180 degrees).

[0024] The surface 34 has a pentagonal shape formed with five straight lines (22a, 24a, 26a, 28a, and 30a) as tangents to the five surfaces (22, 24, 26, 28, and 30). A vertex 38a has a longer overlap distance from the central point X' of a section of the core wire than the other vertices, and an internal angle P is smaller than the other internal angles. The straight lines 28a, 30a, and 22a constituting the surface 34 have equal lengths, and their perpendiculars (28d, 30d, and 22d) to the central point X' are also equal in length. The two remaining straight lines (24a and 26a) also have equal lengths, and their perpendiculars to the central point X' are also equal in length. Surface 34 has a symmetrical shape.

[0025] The application portion 8 has an external shape that continues while rotating 180 degrees in a circumferential direction around the central axis X as the surface 34 advances along the central axis X towards the surface 36. Therefore, as shown in Figures 2(e) to 2(i), a transverse shape of the application portion 8, formed with profile lines (22b, 24b, 26, 28, 30b and 32b) of the five surfaces (22, 24, 26, 28 and 30), adopts the same pentagonal shape than that of surface 34 in any cutting position, and is different only from the point of view of orientation with respect to surface 34.

[0026] Effect of the first embodiment The application section 8 comprises 20 bristles extending evenly radially in a circumferential direction around the core section 18. The application section 8 has a pentagonal cross-section, with the distances from the core section 18 (as the center) to the tips of the bristles 20 (i.e., the bristles 20 are short) and the bristles 20 being long, arranged in a circumferential direction. In the section with the long bristles 20, the bristles penetrate between the eyelashes, curling and lifting them. The section with the short bristles 20 holds the liquid mascara 16, readily contacting the roots of the eyelashes and increasing their volume.These two parts are arranged circumferentially, so that when applying liquid mascara 16 to the eyelashes, by slightly rotating the cap 4 which serves as a grip, both parts can be made to contact the eyelashes in a single action. Volume and curl of the eyelashes can be achieved in one application, making it efficient and convenient to use. Furthermore, the part with long bristles 20 and the part with short bristles 20 are continuously formed in a helical fashion around the central axis X, around the core wire part 18 in the direction of the central axis X, and both twist easily into the eyelashes during use. The rotation of the cap 4 provides excellent application control.

[0027] The pentagonal shape, which is the transverse shape of the application part 8, has internal angles, all within the range of 180 degrees, and has no indentation. That is to say, the application part 8 has no groove in the circumferential direction. If a groove were present in the circumferential direction, the lashes would have difficulty entering the groove, making application difficult. Since the application part 8 has no groove in the circumferential direction, the hairs easily make contact with the lashes and twist easily within them, as described above. The same shape also continues in the direction of the central axis X while rotating, so the maximum external diameter is the same in any position, and by using the applicator while rotating it, the lashes can be curled evenly.

[0028] Eyelashes can be curled and volumized with a single application using a cosmetic product applicator 2, eliminating the need for separate curling and volumizing. Therefore, liquid mascara 16 can be applied efficiently and the eyelashes can be set. Volume and curling are easily achieved, and the application is highly practical.

[0029] The perpendiculars of straight line 28a, straight line 30a, and straight line 22a with respect to the central point X' are equal, and a line connecting them is similar to an arc around the central point X'. Straight lines 26a and 24a are connected to the endpoints of this arc, and the surface 34 has substantially a teardrop shape as it connects the arc and a triangle. The central point X' is not at the center of the surface 34 but is positioned eccentrically near the side of the arc, and with respect to the hairs 20 on the side of the triangle and the hairs 20 on the side of the arc, the hairs on the side of the triangle are relatively longer and the hairs on the side of the arc are relatively shorter. That is to say, the surface 26 and the surface 24 define a A pointed, ridged section with 20 long bristles is located on the application section 8. This ridged section easily penetrates between the lashes and combs them like a comb, curling them more effectively. This shape makes applying lashes easier compared to a cross-section with an equilateral pentagonal shape. Surfaces 28, 30, and 22 have 20 relatively short, uniformly sized bristles that easily contact the lashes and are ideal for holding liquid mascara 16 and increasing lash volume. The section with 20 long bristles and the section with 20 short bristles are positioned on opposite sides of each other in the circumferential direction, allowing for balanced use while delivering their individual high performance, thus providing excellent usability.

[0030] Second embodimentThe second embodiment is then described. As shown in Figure 3, the second embodiment differs from the first embodiment only in the shape of the cosmetic product brush. A cosmetic product brush 119 according to the second embodiment is formed integrally with a base stem 6 on a pointed end of the cosmetic product applicator 2, as in the case of the first embodiment, and comprises a core wire portion 118 and an application portion 108, and the application portion 108 comprises a main portion 102 provided on the side of the base stem and a reduced diameter portion 104 provided on the side of the pointed end.As in the case of the first embodiment, in the application part 108, the hairs 120 pinched by the core wire part 118 extend regularly radially in a circumferential direction of the core wire part 118 from a twisted part of the twisted core wires 118a (hereinafter referred to as . under the term part of core wire 118), and extend regularly in a helical manner in an axial direction of the part of core wire 118.

[0031] A surface 64 on the side of the base rod of the application part 108 is substantially hexagonal in shape, formed with an arc 62a around a central point X' of a section of the core wire part and five straight lines (52a, 54a, 56a, 58a and 60a). The perpendiculars (52d, 54d, 56d, 58d and 60d) from the central point X' to the five straight lines (52a, 54a, 56a, 58a and 60a) are all equal in length with respect to each other, and are shorter than a distance from the arc 62a to the central point X', as the central point of the arc 62a.

[0032] The main part 102 has a shape formed by continuing this substantially hexagonal shape to the reduced diameter part 104 along the central axis X while rotating 150 degrees in the circumferential direction around the central axis of the core wire part 118. As shown in Figures 3(f) to 3(k), the substantially hexagonal shape formed with cut lines (52b, 54b, 56b, 58b, 60b and 62b) of six surfaces (52, 54, 56, 58, 60 and 62) constituting the main part 102 has the same shape as that of the surface 64 in any cutting position and is different only in orientation.

[0033] The reduced diameter portion 104 has a substantially frustoconical shape, reduced in diameter towards a pointed end, and a surface 66 on the pointed end side is circular. The five surfaces (52, 54, 56, 58, and 60) are respectively helical surfaces extending along the central axis X while rotating about the central axis X of the core wire portion 118, and have the same angle of rotation (150 degrees) from the surface 64 as the end face of the main portion 102 to the reduced diameter portion 104, and further extend to the center of the reduced diameter portion 104.

[0034] Effect of the second embodiment In surface 64, the distances of the straight lines 54a, 56a, and 58a to the central point X' are equal, and among the constituent sides, arc 62a has the longest distance to the central point X', and straight lines 52a and 60a taper towards arc 62a. Surface 64 has substantially a teardrop shape obtained by rounding the corners of a triangle with arc 62a. As in the first embodiment, surfaces 52, 62, and 60 define a ridge portion with long bristles 120, and when the cosmetic applicator 2, including the cosmetic brush 119, is used while being rotated, the ridge portion easily penetrates between the eyelashes and twists easily, lifting the eyelashes.The crest portion is rounded by surface 62, so that it has a predetermined width and an increased area in contact with the eyelashes, easily penetrating between the eyelashes and the comb, and easily entwining with the eyelashes. Furthermore, the crest portion deforms easily due to repeated passage of the wiper 14; however, this deformation can be reduced by rounding it with surface 62.

[0035] The lengths of the perpendiculars from the five straight lines (52a, 54a, 56a, 58a, and 60a) constituting the surface 64 to the central point X' of the core wire portion 118 are all equal. This reduces the steps required to form the application portion 108 during the manufacture of the cosmetic product brush 119 by the manufacturing process described below. This shape is preferable for efficient manufacturing with a short forming time. The application portion 108 is provided with the reduced-diameter portion 104 on the tip. When the cosmetic brush 119 is inserted into and placed in the liquid mascara container 10, since the tip portion is reduced in diameter, the insertion is Easy. Deformation of the tip due to repeated use can be reduced.

[0036] Method for manufacturing a brush for cosmetic products 19 We then describe a manufacturing process for the cosmetic product brush 19 according to the first embodiment with reference to the flowchart in Figure 4.

[0037] First, as a step (S1) prior to the main machining, as shown in Figure 5, the bristles 20 are cut to the same length and sandwiched between the pair of core wires 18a. The core wires 18a are twisted to secure the bristles 20, and consequently, the application portion 8 is formed.

[0038] Then, as a cutting step (S2), as shown in Figure 6, the bristles 20 constituting the application portion 8 are cut uniformly so that the application portion takes on a columnar shape. Up to this point, the steps are the same as those of a known machining process. Therefore, the cosmetic brush 39 is finished before the main machining.

[0039] By shearing the bristles 20 of the cosmetic brush 39 before the main machining by the machining device 40, the application portion 8 is formed into a predetermined shape. As shown in Figure 7, the machining device 40 comprises a rotating blade 48 which includes cutting blades 46 extending in a longitudinal direction from a columnar body portion 44, and a receiving blade 42 having the same width as the cutting blades. The receiving blade 42 and the cutting blades 46 are arranged so as to be parallel to each other over a very small space between them when the rotating blade 48 rotates at high speed around a central shaft Y. Four cutting blades 46 are fixed at regular intervals in a circumferential direction to the body portion 44 in a slightly inclined position in a direction of rotation. All the cutting blades 46 have the same The blade length and height are the same. The machining device 40 shears the bristles 20 entering the space between the cutting blade 46 and the receiving blade 42. Hereinafter, the space between the rotating cutting blade 46 and the receiving blade 42, i.e., a shear line of the bristles 20, is designated as a shear line Z. The machining device 40 is movable in a forward direction DR orthogonal to the body part 44 while rotating the rotating blades 48 at high speed.

[0040] Next, as a position adjustment step (S3), the positions of the cosmetic brush 39 prior to the main machining operation, and of the machining device 40, are adjusted. The cosmetic brush 39 prior to the main machining operation is positioned opposite the machining device 40 such that the central axis X of the core wire portion 18 becomes orthogonal to the shear line Z in a top view, and the central axis X becomes parallel to the forward direction DR in a side view. The position adjustments in the top-down and circumferential directions are made based on the surface 34 and the shear line Z.As shown in the table in Figure 12, first, to form the surface 22 on the application part 8, an adjustment is made such that a distance D in the top-down direction, from the central point X' to the shear line Z, is equal to a distance 22h from the central point X' to the straight line 22a (see cell (a) in the machining frequency column: 1 in the table in Figure 12). As described below, in the first forming step, the position arranged in the circumferential direction can be set to any position; however, during and after the second forming step, the arrangement must be made in a desired shape.

[0041] Next, as a forming step (S4), the machining device 40 is moved in the forward direction DR towards the cosmetic brush 39 prior to the main machining while rotating the rotary blade 48 at high speed so that the shear line Z passes from a rear end to a tip end of the application part 8 and consequently, the tip end parts of the bristles 22c are sheared. By rotating the cosmetic brush 39 prior to the main machining 180 degrees around the central axis X while the shear line Z passes from the rear end to the tip end of the application part 8, the helical surface 22 is formed around the central axis X on the application part 8 (see cell (b) in the machining frequency column: 1 in the table in Figure 12).

[0042] In order to form the surface 24 (S5), the position adjustment step (S3) is performed again. The machining device 40 is moved rearward, and the cosmetic brush 39, which is in front of the main machining operation, is returned by the same amount of rotation (180 degrees) in the circumferential direction to its original position before the forming step. Then, the cosmetic brush 39, which is in front of the main machining operation, is positioned in a rotational drive at an angle al from the returned position in the circumferential direction, such that the distance D in the top-down direction is equal to the distance 24h between the straight line 24a and the central point X' (length of the perpendicular 24d) (see cell (a) in the machining frequency column: 2 in the table in Figure 12). The angle al is between the perpendicular 22d and the perpendicular 24d.

[0043] Next, the forming step (S4) is performed again. In the same way as described above, the machining device 40 is moved towards the cosmetic product brush 39 in front of the main machining positioned in front, while rotating the rotary blade 48, and consequently, the parts The tips of the bristles 24c are sheared. By rotating the cosmetic brush 39 before the main machining at a fixed speed in the circumferential direction at the same angle of 180 degrees in the same direction as the first forming step, while the shear line Z is moved from the rear end to the tip end of the application part 8, the helical surface 24 around the central axis X can be formed on the application part 8.

[0044] The residual surfaces (26, 28 and 30) are also formed by repeating the position adjustment step and the forming step, in the same way (see table in Figure 12) and consequently, the application part 8 having five surfaces (22, 24, 26, 28 and 30) formed in a helical manner around the central axis X is formed.

[0045] As described above, through a position adjustment step (S3) and a forming step (S4), a helical surface can be formed on the application part 8, and the position adjustment step and the forming step are repeated until there is no more surface to be machined.

[0046] Thanks to the manufacturing process described above, helical surfaces extending along the central axis X while rotating about the axis X can be formed on the application portion 8. During the forming of the plurality of surfaces, position adjustments can be made, and by rotating through the same predetermined angle (180 degrees) each time, the application portion 8 has a complex shape in which the surface 34 continues along the central axis X to the surface 36 on the end-tip side while rotating 180 degrees in the circumferential direction about the central axis X of the core wire portion 18, and which has the same pentagonal shape in cross-section as that of the surface 34 in any cross-sectional position, and is different only from the point of view of the orientation of surface 34, can be formed.

[0047] Method for manufacturing a brush for cosmetic products 119 A method for manufacturing a cosmetic product brush 119 according to a second embodiment is then described.

[0048] First, as in the case of the first embodiment, as a step (SI) before the main machining, the bristles 120 are cut to the same length and sandwiched between a pair of core wires 118a, the core wires 118a are twisted to fix the bristles 120, and consequently, an application part 108 is formed.

[0049] Next, as a cutting step (S2), the tip ends of the bristles 120 are cut uniformly, and at the same time, the application part 108 is formed into a ball shape (see cell (b) in the machining frequency column: 0 in the table in Figure 13) which is reduced in diameter towards the tip end, and consequently, a cosmetic product brush 139 is formed before the main machining.

[0050] Next, as a position adjustment step (S3), the cosmetic brush 139, prior to the main machining operation, is positioned opposite the machining device 40 so that a central axis X of the core wire portion becomes orthogonal to a shear line Z in a top view, and the central axis X becomes parallel to the forward direction DR in a side view. An adjustment is made so that a distance D in the top-down direction becomes equal to a distance 52h from a central point X' to the straight line 52a (length of the perpendicular 52d) (see cell (a) in the machining frequency column: 1 in the table in Figure 13).

[0051] Next, as a forming step (S4), the machining device 40 is moved in the forward direction DR while rotating the rotary blade 48 at high speed, and by Consequently, the tip ends of the bristles 52c are sheared. As the machining device 40 moves from a rear end to a tip end of the application part 108, the cosmetic brush 139, prior to the main machining, is driven into rotation 180 degrees around the central axis X. The rotating blade 48 shears the bristles 120 at a central point of the main part 102 and the reduced diameter part 104, and the surface 52 around the central axis X is formed on the application part 108 (see cell (b) in the machining frequency column: 1 in the table in Figure 12).

[0052] Next, in order to form the surface 54 (S5), the position adjustment step (S3) is performed again. The machining device 40 is moved backward, and the cosmetic brush 139, prior to the main machining operation, is also returned by the same amount of rotation (180 degrees) in the circumferential direction to its original position prior to the forming step. In the circumferential direction, the cosmetic brush 139, prior to the main machining operation, is arranged in a position rotated at an angle α5 from its return position. The angle α5 is an angle between the perpendicular 52d and the perpendicular 54d.It is not necessary to readjust the distance D in the top-down direction since the lengths of the perpendiculars (52d, 52d, 56d, 58d and 60d) from all the machining surfaces (52, 54, 56, 58 and 60) to the central point X' are the same (all 52h) (see cell (a) in the machining frequency column: 2 in the table in Figure 13).

[0053] Next, the forming step (S4) is performed again. In the same way as described below, the machining device 40 is moved towards the cosmetic brush 139, positioned in front of the main machining operation, while rotating the rotary blade 48, and consequently, the bristle end parts 54c are sheared. By doing rotate the cosmetic product brush 139 before the main machining in the circumferential direction at a fixed speed at the same angle of 180 degrees in the same direction as the first forming step while the shear line Z is moved from the rear end to the tip end of the application part 108, the helical surface 54 around the central axis X is formed on the application part 108.

[0054] The residual surfaces (56, 58 and 60) are formed in the same way. The position adjustment step and the forming step are repeated until no surface (S5) remains to be machined. A portion left unsheared from the main part 102 is surface 62.

[0055] Thanks to the manufacturing process described above, the cosmetic brush 119, having a complex shape including the reduced-diameter portion 104, can be manufactured. The distance D in the top-to-bottom direction is the same on all machined surfaces, so that after a position adjustment, readjustment in the top-to-bottom direction is unnecessary. Therefore, after fixing the position of the cosmetic brush 139 before the main machining operation, it is only necessary to control the rotation of the cosmetic brush 139 before the main machining and the movement of the machining device 40 in the front-to-back direction, thus simple control and easy machining.

[0056] Modification The embodiments of the present invention are described above, and the present invention is not limited to the embodiments described above, and may be modified and realized differently.

[0057] Without being limited to the application part 8 having the transverse shape described above, an application part 8 having a transverse shape, for example, (a) to (i) represented on Figure 10 can also provide the same effect. The helical surfaces of the application part 8 can rotate in all directions of rotation as long as the directions are the same.

[0058] During the cutting step, the application portion 108 can be formed into a spherical shape. In this case, helical surfaces are formed on a central part of the application portion. The reduced-diameter portion 104 can have a columnar shape with a radius smaller than that of the main portion 102.

[0059] At the position adjustment stage, it is possible that the orientation of the cosmetic product brush 39 before the main machining is reversed so that the side of the tip end is oriented towards the machining device 40, and the application part 108 is sheared from the side of the tip end to the side of the base end.

[0060] In the forming stage, the cosmetic product brush 30, before the main machining, is rotated 180 degrees; however, this angle of rotation can be represented by other angles, for example, 90 degrees, 135 degrees, 270 degrees, 360 degrees, 540 degrees, 720 degrees, and 900 degrees, etc. The bristles 20 are sheared by moving the machining device 40 towards the cosmetic product brush 39 before the main machining; however, it is also possible that the cosmetic product brush 39, before machining, is moved towards the machining device 40 while rotating.

[0061] As shown in Figure 11, in the cosmetic brush 119, the application portion 8 can be deformed after being formed to improve usability. A cosmetic brush 119a curved with respect to the center line of the cosmetic applicator 2 follows the shape of the eyelashes and easily makes contact with them. A cosmetic brush 119b inclined with respect to the center line of the applicator cosmetic product 2 maintains an angle relative to the eyelashes and easily applies liquid mascara to them. List of reference numbers

[0062] 1 Cosmetic product mascara 2. Cosmetic product applicator 4 Cap 6 Base stem 6a Base end part (of the base stem) 6b Hole (of the base stem) 8, 108 Application section 10 Liquid mascara container 12 Reduced diameter part 14 Wiper 16 Liquid Mascara 18, 118 Part of soul thread 18a, 118a Soul Thread 18b Base stem portion (of the core wire portion) 19, 119, 119a, 119b Brush for cosmetic product 20, 120 Hairs 22, 24, 26, 28, 30, 34, 36 Area 22a, 24a, 26a, 28a, 30a Straight line (constituting surface 34) 22b, 24b, 26b, 28b, 30b Straight line (constituting the cutting surface of the application part 8) 22c, 24c, 26c, 28c, 30c 30d Hair tip tip part Perpendicular (to the central point X') 22d, 24d, 26d, 28d, 22h, 24h, 26h, 28h, 30h Distance (to the central point X') 38a Summit 39, 139 Brush for cosmetic product before main machining 40 Machining device 42 Receiving blade 44 Body part 46 Cutting blade 48 Rotating blade 52, 54, 56, 58, 60, 62, 64, 66 Area 52a, 54a, 56a, 58a, 60a Straight line (constituting surface 64) 62a Arc 52b, 54b, 56b, 58b, 60b Straight line (constituting the surface of section 5 of application part 108) 62b Arc 52c, 54c, 56c, 58c, 60c Hair tip part 52d, 54d, 56d, 58d, 60d Perpendicular (to the central point X') 52h Distance (to the central point X') 10 102 Main part (of application part 108) 104 Reduced diameter part (of the application part 108) D Distance (in the top-down direction) X Central axis (of the core wire section) X' Central point 15 Y Central shaft (of the 48 rotating blades)

Claims

DEMANDS 1. Cosmetic product applicator (2) comprising: an application part (8) consisting of: a portion of linear core wire (18) formed with a pair of metallic core wires (18a) twisted helically together; and a number of hairs (20) pinched by a twisted portion of the core wires (18a) and continuing helically in an axial direction of the core wire portion (18) while extending radially, in which: the application portion (8) has an external shape which is a substantially predetermined polygonal shape, all of whose internal angles are within the range of 180 degrees in section at any position in the axial direction of the web portion, and which continues while rotating in a circumferential direction around an axis (X) of the web portion (18) as it advances in the axial direction of the web portion (18), characterized in that, the substantially predetermined polygonal shape being a pentagonal shape formed with five straight lines, presents a vertex (38a) whose distance to the central point (X') of a section of the core wire part is longer than that of other vertices, and whose internal angle (p) is smaller than the other internal angles, the substantially predetermined polygonal shape has a symmetrical form in which three straight lines (28a, 30a and 22a) constituting the substantially predetermined polygonal shape have equal lengths, and have perpendiculars (28d, 30d and 22d) to the central point (X') of equal lengths, the other two straight lines (24a and 26a) having equal lengths, the essentially predetermined polygonal shape essentially has a teardrop shape by joining a triangle and a arc, and the central point (X') of the section of the core wire part (18) is positioned, eccentrically, near the side of the arc and not at the center of the substantially predetermined polygonal shape.

2. Cosmetic product applicator (2) according to claim 1, wherein: The cosmetic product applicator (2) has a transverse shape formed only with straight lines, and the perpendiculars of the straight lines to the center of the core wire part (18) are all equal in length to each other.

3. Cosmetic product applicator (2) according to any one of claims 1 to 2, wherein: a reduced diameter part (12) is provided on a pointed end of the application part (8).

4. Cosmetic product applicator (2) according to any one of claims 1 to 2, wherein: the application part (8) is entirely curved or inclined with respect to a central axis of the cosmetic product applicator (2).

5. A method for manufacturing a cosmetic product applicator (2) according to any one of claims 1 to 4, comprising: a pre-machining step consisting of forming a cosmetic product brush (19) before the main machining which includes a linear core wire portion (18) formed with a pair of core wires (18a) by pinching a number of bristles (20) with predetermined lengths arranged in parallel in the form of a belt by the pair of metallic core wires (18a) and twisting the core wires (18a) helically, and an application portion (8) consisting of bristles (20) which extend radially from a twisted portion of core wires (18a) and continue in a helically manner; a cutting step consisting of forming an external shape of the application part (8) into a substantially columnar shape by uniformly cutting the tip ends of the hairs (20) constituting the application part (8); a position adjustment step consisting of adjusting a position relationship between a machining device (40) comprising a cutting blade (46) and a receiving blade (42) which have a predetermined width for shearing the bristles (20) constituting the application part (8), and the cosmetic product brush (19) before the main machining; and a forming step consisting of forming a shearing surface extending helically over the external shape of the application part (8) by shearing the tip ends of the bristles (20) of the application part (8) by moving the machining device (40) parallel and relative to the axial direction of the core wire part (18) while rotating the cosmetic brush (19) prior to the main machining around the core wire part (18).

6. Method for manufacturing the cosmetic product applicator (2) according to claim 5, wherein: In the forming stage, the cosmetic product brush (19), prior to the main machining, is rotated at a predetermined angle around the core wire portion (18), and By repeating the position adjustment step and the forming step a predetermined number of times, an application part (8) is formed with a desired shape.

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