KR101786155B1 - Toothbrush - Google Patents

Abstract

According to the present invention, there is provided, on the wicking surface, at least two centers located at the approximate center of the wicking surface
A first outer group consisting of a central group consisting of a parent group and two or more outer parent groups intermingled with the central group and a second group of outer groups, Wherein a region enclosed by a ring-shaped line connecting outer edges of the knife-in hole formed by the central knot is defined as a central knot region, and a total number of the knots constituting the central knot group divided by an area of the central knot region Wherein the first outside facade region is a first outer facade region, the second outside facade group region is a second outside facade region, and the first and second outside facies A value obtained by dividing the total number of the features constituting the seed group by the sum of the area of the first outer flocking area and the area of the second outer flocking area is taken as the outer flocking density, All density / middle flocking flocking density represented by the density ratio, to a 1.6 to 6.0 of the toothbrush. INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a toothbrush capable of achieving both a feeling of soft touch on the gum and a high cleaning property of the cervical portion.

Description

Toothbrush {TOOTHBRUSH}

The present invention relates to a toothbrush.

The present application claims priority based on Japanese Patent Application No. 2010-177779 filed on August 6, 2010, the contents of which are incorporated herein by reference.

In toothbrushes, which are cleaning devices in the oral cavity, research has been conducted on the arrangement of hair bundles that are bound with hair to improve the effect of removing plaque, which is the most necessary function. It is known that a basic toothbrush is arranged in a checkered pattern or a zigzag pattern as a pattern of a hair of uniform diameter.

In recent years, due to the heightened awareness of hygiene, the toothbrush has been required to further improve the effect of removing plaque. To such a demand, there has been proposed a toothbrush which combines the hair speeds of different diameters, Has been proposed.

For example, Patent Document 1 discloses a structure in which a front end side flocking area in which a large diameter pattern is arranged in a substantially U shape along the periphery of a mold opening near the front end of the head part, A toothbrush has been proposed in which the implanting hair density of the fore-end side implantation area is made higher than the implantation density of the rear-end side implantation area. According to this toothbrush, a high knitting force (brushing force) can be obtained at each part in the mouth, particularly at the occlusal surface of the molar.

Patent Document 2 discloses a hair dryer comprising a central hair bundle in which a hair bundle is formed in a hair-removal hole having an inner diameter of 2.0 to 2.8 mm at the center along the longitudinal direction of the head portion and a hair bundle having an inner diameter of 1.2 to 1.6 mm on both outer sides of the center hair bundle. A ratio of a total area of the hair-removing holes of the central hair row to a total area of the hair-removing holes of the outer hair row is 1: 0.6 to 1: 2.8. According to this toothbrush, the plaque can be crushed efficiently in a fine portion such as a tooth surface, a cervical portion, and a tooth portion.

Patent Literature 3 discloses that a central tuft and an intermediate tuft having a thinner inner diameter than the bundle diameter of the outer tuft of the outermost row and having a higher rim than the outer tuft have a larger diameter than that of the outer tuft The center filaments of the central tufts are the highest and the filaments of the tufts are sequentially lowered toward the outer row of tufts and the central tufts, the intermediate tufts, and the outer tufts are arranged in this order, A toothbrush has been proposed. According to this toothbrush, excellent cleaning sensation and insertion feeling in a gap in the mouth can be obtained.

Patent Document 4 discloses a method for dividing a central wrist region of a central band-like region into a central band-like region having a width of 3 mm parallel to the axial direction of the toothbrush and a pair of outer regions on both sides thereof, the height of the bristle is set to be higher than the height of the outer main bristle of the outer region and the hardness of the central main bristle is made larger than the hardness of the entire outer main bristle. According to this toothbrush, the interdental portion can be effectively crushed.

A toothbrush using a so-called tapered tooth has been proposed, in which a bristle of a hair is sharpened.

For example, Patent Document 5 proposes a toothbrush in which a tapered needle-shaped protrusion is formed to have a height of 1 mm to 10 mm higher than the simulation height of the needle-shaped surface of the other portion. According to this toothbrush, when the need arises, the nip of the bed can locally and intensively penetrate into the peripheral portions of the gears such as the gap portion of the teeth or the periodontal pocket, and the food residue can be smoothly removed.

Further, Patent Documents 6 to 7 propose toothbrushes in which a hair core having a different pattern is formed, and the distal end portion of the bristles constituting the hair core is tapered. According to this toothbrush, it is possible to obtain a good brush feel feeling and a sense of insertion into a gap in the mouth.

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-229065 Patent Document 2: JP-A-2008-154808 Patent Document 3: Japanese Patent No. 3583346 Patent Document 4: Japanese Patent No. 4076403 Patent Document 5: JP-A-2002-85159 Patent Document 6: Japanese Patent No. 3585811 Patent Document 7: JP-A-2001-346632

However, when it is caught by periodontal disease, there is a tendency to like toothbrushes that feel as if they do not irritate gums (teeth) as much as possible in order to avoid pain and bleeding during toothpaste. In order to prevent irritation to the gums, a soft appearance with thinner horseshoe, a so-called lower hairs of hairs, or a higher density of horseshoe hairs is used to disperse the swath pressure .

On the other hand, if the appearance of the hairs having a low rigidity of the hairs is used, the removal of the plaques tends to be insufficient, and if the density of the hairs is increased, the movement of each hairs necessary for putting the busbars in the gap between the teeth and the gums is limited . A toothbrush such as a tooth can not satisfy the " cleanliness of the cervical portion " which is a fundamental problem of the periodontal disease countermeasure. In a periodontal disease patient, a toothbrush capable of adequately cleaning the cervical portion while giving a feeling of relief not giving burden to the gum is required.

In addition, the toothbrushes of Patent Documents 1 to 7 described above are inventions made from the viewpoint of efficient removal of plaque, so that consideration for a periodontal disease patient is insufficient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a toothbrush capable of satisfying both the feeling of gentle contact with the gum and the high cleaning property of the cervical portion.

As a result of intensive studies, the inventors of the present invention have found that since the hair located on the outer side in the widthwise direction of the food wedge tends to contact the gums, a feeling of soft touch to the gums can be realized by relieving the pressure on the gums caused by this hair ≪ / RTI > In addition, it is confirmed that the uniformity of the hair density of the hair located in the approximate center of the hair shaft and the hair shaft density of the hair located outside the hair shaft are both within a certain range, And the present invention has been accomplished.

In other words, the toothbrush of the present invention is provided with a handle provided with a head portion at a tip end, and two or more bristles formed on the wedge-shaped surface of the head portion,

And a central hair group (hair bundle group) formed of two or more central hair bundles arranged in the axial direction of the handle body and located at the approximate center of the hair styling surface, A pair of outer hair groups consisting of at least two outer hair groups interspersed with the central hair group,

Wherein a region surrounded by a ring-shaped line connecting outer edges of the knife-forming holes formed at the outermost periphery of the central knot group is formed as a central knife-forming region, Of the outer hair group is divided by the area of the central hair-knee region, and a value obtained by dividing the total number of the outer hair-knee regions by the circumferential line And a region enclosed by a ring-shaped line connecting outer edges of the outer bristles provided with the outer bristles located at the outermost periphery of the other outer bristle group as a first outer bristle region, And the total number of the features constituting the pair of outer patterns is set to be equal to the area of the first outer covering area and the outer covering area of the second outer covering area And an area ratio of the outer bristle density / the center bristle bristle density is 1.6 to 6.0.

Wherein the central core has a cross-sectional area perpendicular to the longitudinal direction of 1.0 to 1.6 mm and a cross-sectional area of the outer core perpendicular to the longitudinal direction of the outer core, Sectional shape of the central hair is 1.8 or more and it is more preferable that the length of the central hair is longer than the length of the hair-like surface of the outer hair, and the center hair speed and the outer hair It is more preferable that both of the inner and outer sides of the inner portion include features that gradually decrease in diameter toward the busbars.

According to the toothbrush of the present invention, on the wicking surface of the head portion, there are provided a central wing group formed by two or more central wing spans which are arranged side by side in the axial direction of the handle body and which are located at the approximate center of the wing body, And a pair of outer hair groups made up of at least two outer hair groups interspersed with the central hair group in a direction in which the outer hair group is arranged,

Wherein a region enclosed by a ring-shaped line connecting the outer edges of the knockout holes formed at the outermost periphery of the central knot group is formed as a central knit area, and the total number of the features constituting the central knot group A region divided by the area of the central flocking region is defined as a central flocking density and a region surrounded by a ring-shaped line connecting the outer edges of the flocking holes, which are located at the outermost periphery of the one outer- And a region enclosed by a ring-shaped line connecting the outer edges of the knockout holes provided with the outer knots located at the outermost periphery of the other outer knot group as a second outer knocked area, Wherein the total number of features constituting the pair of outer patterns is greater than the area of the first outer flocking area and the area of the second outer flocking area Because of being a value obtained by dividing by the outer flocking density sum, and the flocking density ratio of 1.6 to 6.0 represented by the outer flocking density / middle flocking density, it is possible to achieve both soft hit feeling and a high cleaning capability of the cervical area of the gum.

According to the toothbrush of the present invention, the central hairline has a cross-sectional area perpendicular to the longitudinal direction of the outer hairline of 1.0 to 1.6 mm and a cross-sectional area of the outer hairline perpendicular to the longitudinal direction of the outer hairline, Sectional area of the central hair orthogonal to the longitudinal direction of the center hair is 1.8 or more, the feeling of contact with the gum can be better and the cleaning property of the cervical portion can be further improved.

According to the toothbrush of the present invention, since the length of the central hair on the bristles is longer than the length on the bristles of the outer bristles, the distal end of the central bristles is likely to enter the periodontal pocket or the teeth. , The cleaning property of the cervical portion can be further improved.

Since either or both of the central hair shaft and the outer hair shaft include features that gradually decrease in diameter toward the bus bar, the tip of the hair constituting the center hair shaft or the outer hair shaft is inserted into the periodontal pocket or the teeth It is easy to enter, and the cleaning property of the cervical portion can be further improved.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 A and B are a top view and a side view of a head portion of a toothbrush showing one embodiment of the present invention.
2 is a side view of the features used in the toothbrush of FIG. 1A and FIG. 1B.

The toothbrush of the present invention will be described below with reference to the drawings. Fig. 1 (A) is a plan view showing a head portion of a toothbrush 1 according to an embodiment of the present invention, and Fig. 1 (B) is a side view of a head portion of a toothbrush 1 according to an embodiment of the present invention.

1 (A) and 1 (B), the toothbrush 1 has a handle 2, and the handle 2 has a long grip portion (not shown) And a head portion 4 provided at the tip of the grip portion. 1, reference symbol O denotes a line passing through the axis of the handle body 2, that is, the longitudinal direction of the handle body 2, and also passing through the center of the handle body 2. [

The head portion 4 has an approximately rectangular shape in plan view in which the direction of the axis O is a long side and an arbitrary surface is a wicking surface 5 on which a mother line is formed. 23 central opening holes 10 in a cylindrical shape with a bottom are formed in a zigzag shape along the axis O and on the axial line O in the wedge opening 5, , And a central hair bundle (12) in which two or more central features (13) are bundled in a substantially cylindrical shape is formed to form a central hair bundle (14).

The central molding hole 10 is sandwiched in the widthwise direction, that is, the direction orthogonal to the axial line O and twelve outer cylindrical molding holes 20 is formed on the outer side face of the outer blade 20. An outer blade 22 having two or more outer blades 23 in a substantially cylindrical shape is stitched on the outer blade hole 20. The first external side group 24a is constituted by the six external side blades 22 provided along the side edge 6 of the head part 4 and the head part 4 is formed by the six external side blades 22, And the second outside hair group 24b is constituted by the six outer hair blades 22 provided along the side edge 7 of the first outer hair group 22.

The stator t1 which is the length on the corrugated surface 5 of the central corrugate 12 is longer than the streak t2 which is the length on the corrugated surface 5 of the outer corrugate 22.

The center hair covering region 11 is formed at the center of the center hair group 14 in the center of the center hair group 14, Is a region surrounded by a ring-shaped line connecting the outer edge of the center hair-knife hole (10) with the hair ring (12). Further, these annular lines constitute a common tangent line between the adjacent center hair-removal holes 10.

A first outer side plate portion 21a is formed on the wicking surface 5 to indicate a region where the first outer side group 24a is provided. The first outer side plate portion 21a is formed with a first outer side Is an area surrounded by a ring-shaped line connecting the outer edge of the outer bristle hole (20) formed with the outer bristle (22) constituting the bristle group (24a).

The annular line constitutes a common tangent line between adjacent outer brick holes 20 in the first outer brick group 24a.

The second outer brassiere region 21b is formed on the second brassiere 5 and the second brassiere brassiere 21b is formed on the second brassiere brassiere 21b. Is an area surrounded by a ring-shaped line connecting the outer edge of the outer bristle hole 20 in which the outer bristle 22 constituting the outer bristle group 24b of the bristle ring 24 is formed. The annular line constitutes a common tangent line between the adjacent outer brick holes 20 in the second outer brick group 24b.

The material of the handle 2 can be determined in consideration of the stiffness and mechanical characteristics required of the toothbrush 1. For example, a high hardness resin having a flexural modulus (JIS K7203) in the range of 500 to 3000 MPa By use, the mechanical characteristics required for the toothbrush 1 can be obtained. Examples of such high hardness resins include polypropylene (PP), polyethylene terephthalate (PET), polycyclohexylenedimethylene terephthalate (PCT), polystyrene (PS), acrylonitrile butadiene styrene (ABS) Cellulose acetate propionate (CP), polyarylate, polycarbonate, and acrylonitrile styrene (AS). One or more of these may be used.

The size of the head portion 4 can be determined in consideration of the operability into the oral cavity and the like. For example, the width W is 10 to 15 mm and the thickness T is 4 to 8 mm.

The diameter R1 of the center hair removal hole 10 can be determined in accordance with the diameter of the central hair bundle 12, that is, the diameter of the cross section perpendicular to the longitudinal direction of the central hair bundle 12, Mm. In the present embodiment, the diameters R1 of all the center hair-removal holes 10 are approximately equal. Roughly equivalent means that all diameters (R1) are included in the range of ± 5%.

The diameter R2 of the outer brim 20 can be determined according to the diameter of the outer brim 22 and is, for example, 1.8 to 2.4 mm. In the present embodiment, the diameters R2 of all the outer brick holes 20 are approximately equal. Roughly equivalent means that all diameters (R2) are included in the range of ± 5%.

In Fig. 1A, the number of the center hair-removal holes 10 is 23. However, the present invention is not limited to this. The number of the center hair-removal holes 10 can be determined in accordance with the shape of the wicking surface, and is preferably 18 to 28 pieces.

In Fig. 1 (A), the number of the outer flap holes 20 is 12. However, the present invention is not limited to this. The number of the outer flap holes 20 can be determined according to the shape of the mold surface, and is preferably 8 to 16.

The target t1 of the central blades 12 can be determined in consideration of the material and the thickness of the central appearance 13 and is, for example, 6 to 15 mm.

Although the diameter of the cross-section r1 of the central comb tooth 12, that is, the cross-section perpendicular to the longitudinal direction of the central comb tooth 12 is not particularly limited, preferably 1.0 to 1.6 mm, more preferably 1.2 to 1.4 mm Do. When the peripheral hair r1 of the central hair bundle 12 is 1.0 mm or more, the rigidity of the hair as the center hair bundle 12 is increased and the cleaning property of the cervical portion is improved. When the peripheral hair r1 is 1.6 mm or less, It is easy to infiltrate into fine parts such as periodontal pockets and teeth, and the cleaning property is improved.

In the present embodiment, the inherent radius r1 of all the central macros 12 is approximately equal. Roughly equivalent means that all diameters (r1) are included in the range of ± 5%.

The number of the central appearance pieces 13 per single central woofer 12 can be determined in consideration of the appearance of the central appearance 13, for example, 10 to 30 pieces.

The inherent radius r1 of the center hub 12 is a diameter at the boundary with the molding surface 5 and is substantially equal to the diameter R1 of the center hair removal hole 10. The rough equivalent means the difference within ± 5%.

The value obtained by dividing the total number of the central features 13 constituting the central feature group 14 by the area of the central feature region 11 (center wear density) of the central feature group 14 is particularly limited For example, 4 to 11 / mm 2 is preferable, and 6 to 9 / mm 2 is preferable. When the center hair dye density is less than 4 pieces / mm 2, the central hair bundles 14 are not mutually supported at the time of brushing, and the lower hair becomes rigid and the cleaning property of the cervical portion is lowered. When the density of the center hair knit hair exceeds 11 pieces / mm < 2 >, interference between adjacent central hair bundles 14 becomes large at the time of knitting, so that the movement of the central hair bundle 14 is excessively restrained, (13) is prevented.

As shown in Fig. 2, the central figure 13 has a substantially cylindrical shape, and its tip portion is a so-called tapered hair whose diameter gradually decreases from the base portion 13b toward the tip end 13a.

The material of the central appearance 13 is not particularly limited, and examples thereof include polyamides such as 6-12 nylon and 6-10 nylon; Polyesters such as PET, polybutylene terephthalate (PBT), and polytrimethylene terephthalate (PTT); Polyolefins such as PP; And synthetic resin materials such as an olefinic elastomer and a styrene-based elastomer can be used. Further, two or more of these resin materials may be used in combination, and other resin materials may be used in the core portion and the sheath portion, such as a core sheath structure.

The apparent radius of the central figure 13 can be determined in consideration of the material of the central figure 13 or the like and becomes, for example, 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm). If it is 6 mils or more, the rigidity of the fur which can clean the cervical portion satisfactorily is secured, and if it is 9 mils or less, the flexibility to mitigate the irritation to the gums and the like is secured. The diameter of the tapered portion in the tapered sidewall is the diameter at the base portion 13b of the tip end portion immediately before the diameter gradually decreases toward the tip end 13a.

The length of the outer blade 22 on the blade surface 5, that is, the blade length t2 can be determined in consideration of the material and the thickness of the outer workpiece 23 and is, for example, 6 to 13 mm.

The parent tangent t3 of the stamina t1 of the central parent sheath 12 and the parent tangent t2 of the outer parent sheath 22 represented by the following formula (1) is preferably 0.3 mm or more and 2.0 mm or less, more preferably 0.5 to 1.5 Mm is more preferable. If t1 > t2, the cleaning property of the cervical portion and the feeling of contact with the gum can be further improved.

(Mm) t1 (mm) -matrix t2 (mm) (One)

The inner diameter r2 of the outer blades 22, that is, the diameter of the cross section perpendicular to the longitudinal direction of the outer blades 22 is preferably 1.8 to 2.4 mm, more preferably 2.0 to 2.2 mm. When the inherent diameter r2 of the outside hair 22 is less than 1.8 mm, the pressure applied to the gums at the distal end of the outside hair 22 can not be dispersed at the time of brushing, The feeling of touch of the user is deteriorated. If the inner diameter r2 of the outer blind spiral 22 exceeds 2.4 mm, the outer appearance of the outer blind 23 is too large to interfere with the other outer blinds 23 constituting the same outer blind 22, And the soft touch feeling is lowered.

In the present embodiment, the inherent radius r2 of all the outer bladders 22 is approximately equal. Roughly equivalent means that all diameters (r2) are included in the range of ± 5%.

The number of the outer appearance eyes 23 per one outer appearance hair 22 can be determined in consideration of the appearance of the outer appearance eyes 23 and the like, and is, for example, 50 to 200.

The inner diameter r2 of the outer blades 22 is the diameter at the boundary with the molding surface 5 and is substantially equal to the diameter R2 of the outer blade hole 20.

As the ratio of the cross sectional area (outer hatching cross sectional area) perpendicular to the longitudinal direction of the outer hatching 22 to the cross sectional area (central hatching cross sectional area) orthogonal to the longitudinal direction of the central hatching 12, Sectional area ratio] is preferably 1.8 or more, more preferably 1.8 to 5.0, still more preferably 2.5 to 4.0. If the ratio is 1.8 or more, the inner diameter of the outer wedge 22 is not too small, and the pressure applied to the gum at the distal end of the outer wedge 22 can be sufficiently dispersed to improve the feeling of contact. In addition, there is no too large a diameter of the center hair 12, and the distal end of the center hair 12 is easily inserted into the periodontal pocket and the teeth, and the cleaning property of the cervical portion is improved. If it is 5.0 or less, there is no excessively small blast velocity of the central blast flux 12 compared to the peripheral blast flux 22 of the outer blast flux 22, and the rigidity of the bristles of the central blast flux 12 is high, In addition, the outer blades 22 are not too large, and the operability by amplification of the head portion and the strength of the head portion are improved.

The cross sectional area of the central impeller is approximately the same as the cross sectional area of the boundary between the central impeller 12 and the molding surface 5, The outer sheath cross sectional area is approximately equal to the sectional area of the boundary portion between the outer sheath 22 and the food mold surface and is equal to the opening area of the outer sheath hole 20.

A value obtained by dividing the total number of outer appearance figures 23 constituting the first outside facial group 24a by the area of the first external facial covering area 21a Is preferably at least 10 / mm 2, more preferably at least 15 / mm 2. If the kneading density of the first outside hair group 24a is less than 10 pieces / mm < 2 >, it becomes difficult to disperse the pressure applied to the gums at the distal end of the outside hair bundle 22 at the time of brushing.

A value obtained by dividing the total thickness of the second outside mold group 24b, that is, the total number of the outside molds 23 constituting the second outside mold group 24b, by the area of the second outside mold covering area 21b is And the first outer circumference group 24a.

The dent density of the first outside dam group 24a and the dent density of the second outside dam group 24b may be the same or different. However, from the viewpoint of securing a soft touch to the upper, lower, left, and right gums in the oral cavity at the time of scarfing, the relationship between the hair dye density of the first outer hair group 24a and the hair dye density of the second outer hair group 24b Are preferably roughly equivalent. Furthermore, the term roughly means that the ratio expressed by [the first hair outer coat group density] / [the second outer hair core group hair coat density] is 0.95 to 1.05.

The total number of outer appearance figures 23 constituting the second outer appearance group 24b is the same as the total number of outer appearance figures 23 constituting the first outer appearance group 24a.

The total number of the outer appearance pieces 23 constituting the first outer case group 24a and the total number of the outer appearance pieces 23 constituting the second outer case group 24b may be the same or different. However, from the viewpoint of securing a soft touch feeling on any of upper, lower, right, and left gums in the oral cavity during the scarfing, the total number of the outer appearance pieces 23 constituting the first outer group 24a, It is preferable that the total number of the outer appearance foils 23 constituting the outer periphery group 24b is approximately equal.

The term roughly means that the ratio expressed by [the total number of outer appearances constituting the first outer circumference group] / [the total number of the outer appearance constituting the second outer normally group] is from 0.95 to 1.05 do.

The sum of the total number of the outer appearance pieces 23 constituting the first outer case group 24a and the total number of the outer appearance pieces 23 constituting the second outer case group 24b, The value (outer covering density) divided by the sum of the area of the flocking area 21a and the area of the second outer flocking area 21b is preferably 10 pieces / mm2 or more, more preferably 15 pieces / mm2 or more Is more preferable. When the outer covering density is less than 10 pieces / mm < 2 >, it becomes difficult to disperse the pressure applied to the gums at the distal end of the outside hair 22 in the case of the tooth closure.

The ratio of the stocking density expressed by [outer stocking density] / [centering stock density] is 1.6 to 6.0, preferably 1.8 to 4.0, and more preferably 2.0 to 3.5. When the filling density ratio is 1.6 or more, the feeling of soft touch improves by lowering the pressure dispersion of the outer mold group, and the durability of the central mold increases the cleaning property of the cervical portion. When the hair density ratio is 6.0 or less, the rigidity of the hair of the central hair group 14 is increased, and the cleaning property of the cervical portion is improved. That is, within the above-mentioned range, both a feeling of soft touch on the gum and a good cleaning performance of the cervical portion can be achieved.

As in the case of the central appearance 13, the outer appearance 23 is a tapered portion whose tip gradually becomes smaller in diameter toward the front end.

The material of the outer appearance 23 is the same as that of the central appearance 13. [

The material of the central figure 13 and the material of the outer figure 23 may be the same or different.

The outer appearance of the outer appearance 23 can be determined in consideration of the material of the outer appearance 23 or the like, and is, for example, 4 to 7 mil. If it is 4 mil or more, sufficient self-supportability can be obtained. If it is 7 mil or less, irritation to the gum can be sufficiently mitigated.

In addition, it is preferable that the outer appearance of the outer appearance 23 is smaller than the outer appearance of the middle appearance. With such a constitution, the cleaning ability of the cervical portion can be improved by the central appearance 13 while relieving the irritation to the gum by the outer appearance 23 which is likely to come into contact with the gum in the fastener.

The method of manufacturing the toothbrush 1 of the present invention can be performed by a conventionally known method. For example, a method of folding two pieces of appearance and fitting a flat line between the two pieces, A wire-type monolithic method, a heat fusion method in which the lower end of the hair is pressed into and fixed in a molten resin to be a forming part, an inmold method in which a bottom part of the hair is heated to form a molten mass, .

According to the present embodiment, since the central seed group is provided at the approximate center of the mold core, a pair of outer seed groups are provided at both sides of the central seed group, and the filling density ratio is 1.6 to 6.0, , The outer hair group with high hair density has contact with the gum to give a soft touch, and the cervical portion can be cleaned well by the central features constituting the central hair group having a low hair density. This is because the outer hair group, which is likely to come into contact with the gum during the scaling, has a high hair density, so that the pressure applied to the gums at the tip of the outer hair is dispersed and the stimulation to the gums is alleviated.

In addition, since the central dense group has a lower filling density than the outer dense group, the degree of freedom of movement of each central feature is secured, and the central feature easily enters the periodontal pocket or the interdental region, . In addition, since the movement of the center figure is appropriately controlled by the pair of outer hair groups, the central appearance secures the rigidity of the hair necessary for removing the plaque, so that the cervical portion can be cleaned satisfactorily.

According to the present embodiment, since the central hair is longer than the outer hair, it is easy to enter the periodontal pocket and the teeth, and the cleaning ability of the cervical portion can be further improved.

According to the present embodiment, since the central appearance and the outer appearance are tapered, the central or outer appearance is easily penetrated deeply into the periodontal pocket and the teeth, and the cleaning property of the cervical portion can be further improved.

The present invention is not limited to the above-described embodiment. In the above-described embodiment, the central shape is a substantially cylindrical shape. For example, it may be an elliptical elliptical shape in plan view, or a polygonal shape such as a triangular shape, a quadrangle shape, and a pentagon shape in plan view. Further, when the shape of the central hair is set to a shape other than the shape of the circumference, the diameter of the hair is the diameter of the circular circle circumscribing the flat shape.

Further, the outer sheath may be an elliptical oval shape as viewed from a plane, or a polygonal shape such as a triangular shape, a quadrangle, and a pentagon as viewed from a plane, as in the case of a center coarse speed.

In the above-described embodiment, the center flap hole is a cylindrical shape with a bottom. However, the shape of the central flap hole can be determined in accordance with the shape of the central hair flap. For example, Or may be a polygonal tubular shape having a bottom such as a triangular shape, a square shape and a pentagon shape in plan view.

In addition, the outer side flap hole may be a tubular shape having an elliptical bottom as viewed from a plane, or a polygonal tubular shape having a bottom such as a triangular shape, a quadrangular shape and a pentagonal shape in plan view.

In the above-described embodiment, the diameters of all the center hair-removal holes are substantially equal, but the present invention is not limited to this. The diameters of all the center hair-removal holes may be different from each other, The diameter of the flock hole may be different.

In the above-described embodiment, the diameters of all the outer siphon holes are approximately equal, but the present invention is not limited thereto. The diameters of all the outer siphon holes may be different from each other, The diameters of the other outer bristle holes may be different.

In the above-described embodiment, the central appearance is tapered, but the present invention is not limited to this. For example, the central appearance may have a uniform diameter in the longitudinal direction, And may be a plane parallel to the mother face. However, from the viewpoint of easy entry into the periodontal pocket or the toothed portion, it is preferable that the central appearance of a part of the central hair is tapered, and it is more preferable that all central features of the central hair are tapered.

The outer appearance may have a uniform diameter in the longitudinal direction as in the case of the central appearance, or may be a surface whose tip is parallel to the hemispherical surface or the wedge-shaped surface. However, it is preferable that the outer appearance of a part of the outer hair is tapered and that all outer appearances of the outer hair are tapered from the viewpoint of making the touch to the gums smooth.

In addition, one of the central appearance or the outer appearance may be constituted by a tapered ridge.

In the above-described embodiment, the central appearance and the outer appearance are tapered corners of a substantially cylindrical shape. However, the central appearance and the outer appearance are not limited to the shape of an oval-shaped oval in plan view and a polygonal shape such as a triangle, Shape or the like. Further, in the case where the central appearance or outer appearance has a shape other than the shape of the substantially cylindrical shape, the diameter of the visual circle is the diameter of the circular arc which circumscribes the shape of the shape in the plane.

In the above-described embodiment, the stitch of the central stitch is longer than the stitch of the outer stitch. For example, the stitch of the central stitch and the stitch of the outer stitch may be the same, May be shorter than that of the outer hair. It is also possible to set the motions of the center and outer coats so that the shape of the end of the core is an uneven surface in which the crests and valleys are repeated in the axial direction of the handle.

However, from the viewpoint of satisfactorily cleaning the cervical portion, it is preferable that the central cochlea is longer than the outer cochlea.

In the above-described embodiment, the central hair group is formed by arranging the central hair in a zigzag shape. For example, the central hair group may be formed in a checkered pattern. In addition, although the central group consists of 23 central groups, the number of central groups constituting the central group may be 22 or less, or may be 24 or more.

In the above-described embodiment, the first or second outer group is composed of six outer groups, but for example, the outer group constituting the first or second outer group includes no more than five Good, seven or more is good.

In addition, the number of outer hair constituting the first outer hair group and the number of outer hair constituting the second outer hair group may be the same or different.

In the above-described embodiment, the first and second outer hair groups include the outer hair bundles juxtaposed in one line in the axial direction of the handle body, but the present invention is not limited to this. For example, May be formed by arranging the outer core in a checkered pattern or a zigzag pattern. However, from the viewpoint of increasing the size of the outer hair constituting the first and second outer hair groups as much as possible and improving the feeling of contact with the gums, the first and second outer hair groups include the outer mother hair It is preferable to be juxtaposed in one line in the axial direction of the handle body.

In the above-described embodiment, the outer hair is provided on the outer side of the central hair-knee area, but the outer hair may be stuck with the center hair bundle, for example, a part thereof may be located in the center hair-knife area.

In the above-described embodiment, the mother-daughter wings of all the central wings are roughly equal, but the mother wings of the central wing may be different from each other, for example. However, from the viewpoint of appropriately controlling the rigidity of the hair in the central hair, it is preferable that the hair diameter of all the central hair is approximately equal.

Further, in the above-described embodiment, the mother-daughter wings of all the outer mother are roughly equal, but the mother-daughter wings of the outer mother may be different from each other, for example. However, from the viewpoint that the pressure applied to the gum at the distal end of the outer hair is made uniform at the outer hair axis and the impression reached by the entire outer hair group is made soft, it is preferable that the hair velocity of all outer hair is substantially equal.

Example

(Assessment Methods)

With respect to the toothbrushes of the respective examples, the feeling of touch and the cleaning property of the cervical portion were evaluated by the following method. In addition, the cleaning property of the cervical portion was evaluated by " cervical portion insertion feeling " and " cervical portion cleaning feeling ".

<Evaluation of touch feeling>

The touched feeling was evaluated by using 10 toothbrushes of each example on a monitor and evaluating the feeling of touching the gums. A "," B ", and" D "were defined as" A "," C ", and" D ", respectively.

«Evaluation Criteria»

3 points: There is no pain in the gums, and the feeling of touch is very good.

2 points: There is no pain in the gums, and the feeling of touch is good.

1 point: I feel weak pain on my gums.

0 point: I feel a strong pain in my gums.

<Evaluation of cervical insertion feeling>

The cervical portion insertion sensation was evaluated by using 10 toothbrushes of each example on a monitor, and the sensation of insertion into the cervical portion was evaluated as an evaluation standard. A "," B ", and" D "were defined as" A "," C ", and" D ", respectively.

«Evaluation Criteria»

3 point: I feel very much the texture that the bosom reaches the gap between the teeth and the gums.

2 points: I feel the feeling that the mother line reaches the gap between the tooth and the gum.

1 point: I do not feel much of the texture that the mothers reach the gap between teeth and gums.

0 point: I do not feel the touch of the mother line to the gap between the teeth and gums.

<Evaluation of the cervical part cleaning feeling>

The cervical area cleaning sensation was evaluated by using a toothbrush of each example for 10 monitors and evaluating sensation of cleaning the cervical area as an evaluation standard. A "," B ", and" D "were defined as" A "," C ", and" D ", respectively.

«Evaluation Criteria»

3 point: I feel the texture of the gap between the tooth and the gum.

2 points: I feel the texture of the gap between the teeth and the gums.

1 point: I do not feel the texture of the gap between the tooth and the gum.

0 point: I do not feel the texture of the gap between the tooth and the gum.

(Examples 1 to 5 and Comparative Examples 1 and 2)

According to the specifications shown in Table 1, a toothbrush having a tapered (PBT-made) shape was manufactured in the same manner as the toothbrushes 1 of Figs. 1A and 1B. The toothbrush includes a central hair group consisting of a central hair bundle woven in a staggered shape, and a pair of outer hair groups made up of an outer hair bundle with a central hair group interposed therebetween. The first outermost group and the second outermost group consist of the same number of outer domes.

In the table, the &quot; central appearance count per central blind spots &quot; is the number of central appearances constituting one central blind spots, and the &quot; outer appearance count per outer blind spots &quot; is the outer appearance counts constituting one outer blind spots. The specification of the outer hair group is described as the combination of the first outer hair group and the second outer hair group.

The touched feeling, the cervical portion insertion sensation, and the cervical portion sensation were evaluated with respect to each of the obtained toothbrushes, and the results are shown in Table 1.

[Table 1]

As shown in Table 1, in Examples 1 to 5 in which the present invention was applied, "A" or "B" were all evaluated as tactile sensation, cervical portion insertion sensation, and cervical portion sensation. On the other hand, in Comparative Example 1 in which the filling density ratio was 1.2, the evaluation of touch feeling, cervical portion insertion feeling, and cervical portion sensation was "C". Further, in Comparative Example 2 in which the filling density ratio was 6.1, the evaluation of the touch feeling was "A", but the evaluation of the cervical portion insertion feeling and the cervical portion cleaning actual feeling was "C".

From these results, it was found that, by applying the present invention, both a feeling of soft touch on the gum and a cleanliness of the cervical portion can be achieved.

[Industrial Availability]

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a toothbrush that combines a feeling of soft touch on a gum and a high cleaning property of a cervical portion.

1: toothbrush 2: handle body
4: head part 5:
10: center flap hole 11: central flap area
12: Central blind 13: Central appearance
14: Central group 20: Outer opening
21a: first outer-side hair-knee area 21b: second outer-side hair-knee area
22: Outer spool 23: Outer appearance
24a: first outer group 24b: second outer group
O: Axis

Claims (6)

A toothbrush comprising a handle body provided with a head portion at its tip end and having a shape of a figure formed in two or more knife-inholes formed on the wedge-shaped surface of the head portion,
Wherein the central axis of the handle body is formed with two or more central axis coaxially arranged in the axial direction of the steering wheel body and located at the approximate center of the steering wheel body, And a pair of outer hair groups made up of at least two outer hair blades,
Wherein a region enclosed by a ring-shaped line connecting the outer edges of the knockout holes formed at the outermost periphery of the central knot group is formed as a central knit area, and the total number of the features constituting the central knot group The value obtained by dividing the area by the area of the center flocking area is defined as the center flocking density,
A region enclosed by a ring-shaped line connecting the outer edges of the knockout holes formed in the outermost periphery of the outer solitary group on one side is referred to as a first outer knitted region and the region surrounded by the ring- A region enclosed by a ring-shaped line connecting outer edges of the outer bristles provided with the outer bristles located at the outermost periphery is defined as a second outer bristle region, and the total number of the appearances constituting the pair of outer bristles is A value obtained by dividing the area by the sum of the area of the first outer flocking area and the area of the second outer flocking area is taken as the outer flocking density,
Wherein the ratio of the filling density expressed by the outer bristle density / the center bristle density is 1.6-6.0, the number of the central bristle is 14-29, and the number of the outer bristle is 8-18. The method according to claim 1,
Wherein the center coat density is 4 to 11 / mm &lt; 2 &gt;
Wherein the outer covering density is 10 / mm &lt; 2 &gt; or more. 3. The method according to claim 1 or 2,
Wherein the central core has a diameter of a cross section perpendicular to the longitudinal direction of 1.0 to 1.6 mm,
Wherein a value obtained by dividing the cross-sectional area of the outer hair perpendicular to the longitudinal direction of the outer hair by the cross-sectional area of the central hair perpendicular to the longitudinal direction of the middle hair is 1.8 or more. 3. The method according to claim 1 or 2,
Wherein the value obtained by dividing the cross-sectional area of the outer hair perpendicular to the longitudinal direction of the outer hair by the cross-sectional area of the central hair perpendicular to the longitudinal direction of the middle hair is 1.8 to 5.0. 3. The method according to claim 1 or 2,
Wherein the central hair is longer on the flossing surface than on the flossing surface of the outer hair. 3. The method according to claim 1 or 2,
Wherein either or both of said central hairline and said outer hairline include features that gradually decrease in diameter towards the busbars.

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