JP2007229065A - Toothbrush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothbrush retaining an appropriate bristle filling density of the front ends of a head part, easily inserted into respective portions in the oral cavity and exhibiting a high toothbrushing force. <P>SOLUTION: A bristle bundle 15 filling a filling face 12 of the head part 11 is provided with large-diameter bristle bundles 15a disposed into an approximately U shape along the circumferential edge of the bristle filling face 12 near the front end 11a of the head part 11 and small-diameter bristle bundles 15b disposed near the rear end 11b of the head part 11. The six large-diameter bristle bundles 15a in total are disposed into the approximately U shape, for example, two bundles are disposed along the outer circumference of the front end side A of the bristle filling face 12 near the front end 11a, and two bristles are disposed in both sides respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a toothbrush, and more particularly, to an arrangement of hair bundles of a toothbrush.

  In order to enhance the plaque removal effect, which is the most necessary quality, in a toothbrush that is an intraoral cleaning tool, conventionally, an arrangement has been made in the arrangement of hair bundles in which the brushes are bundled in the head portion. As the most basic arrangement of toothbrush hair bundles, uniform diameter hair bundles are arranged in a regular grid pattern or staggered pattern on the flocked surface of the head portion.

On the other hand, a toothbrush in which hair bundles having different diameters are arranged in a specific pattern is known as a device for enhancing the cleaning effect in accordance with a complex shaped oral cavity.
For example, Patent Document 1 describes a toothbrush in which a hair bundle having a diameter larger than that of other portions is arranged on the rounded tip of the head portion. Patent Document 2 describes a toothbrush in which a hair bundle having a large diameter is disposed at the front end portion and the rear end portion of the head portion, and a hair bundle having a small diameter is disposed at a central portion sandwiched between the front end portion and the rear end portion. ing. Furthermore, Patent Document 3 describes a toothbrush having a plurality of bristle bundles having different hardness characteristics.
Japanese Utility Model Publication No. 3-72720 JP 2000-175744 A JP 2002-199938 A

  However, the conventional toothbrush using a plurality of bristles having different diameters as described above arranges the bristles having a large diameter in a rhombus shape or in a grid pattern. Although the actual feeling of brushing and cleaning became stronger, the flocked portion of the hair bundle having a large diameter became too hard, making it difficult for the brush tip to enter the fine irregularities of the tooth surface, leading to a reduction in the brushing force. In addition, when a hair bundle having a large diameter is arranged in a V shape on the front end side of the head portion as in Patent Document 1, the width of the hair transplantation region becomes narrow at the tip portion of the head portion, and insertion into the back teeth or the like is possible. Although it is easy, since the flocking density is increased, it is difficult for the brush tips to enter the fine irregularities of the tooth surface.

  The present invention has been made in view of the above circumstances, and provides a toothbrush that can maintain a suitable flocking density at the front end portion of the head portion, can be easily inserted into each portion of the oral cavity, and can exhibit a high brushing force. For the purpose.

  In order to achieve the above object, according to the present invention, a head portion in which a plurality of hair bundles in which a large number of brushes are bundled is arranged on a flocked surface extending between a front end and a rear end, and a rear end of the head portion. A toothbrush having a handle portion to be connected, which is arranged in a substantially U shape along the periphery of the flocked surface near the front end of the head portion, and two large-diameter hair bundles arranged at the front end; A small-diameter hair bundle disposed near the rear end of the head portion, and the flocking density of the front-end side flocking region surrounding the outer periphery of the flocking range of the large-diameter hair bundle is determined based on the flocking range of the small-diameter hair bundle. The toothbrush characterized by making it higher than the flocking density of the rear end side flocking area | region surrounding an outer periphery is provided.

  What is necessary is just to form so that the flocking area of the said front end side flocking area | region in the said flocking surface may become narrower than the flocking area of the said rear end side flocking area | region. At least one or more small-diameter hair bundles may be arranged on the inner side surrounded by the large-diameter hair bundle arranged in a substantially U shape along the periphery of the flocked surface near the front end of the head portion. A hair bundle area ratio between the large-diameter hair bundle and the small-diameter hair bundle may be 1.9 to 3.2.

  According to the toothbrush of the present invention, in addition to the powerful brushing effect due to the large-diameter bristle bundle at the front end of the flocked surface, the large-diameter bristle bundles that are arranged in a substantially U shape as a whole are closer to the front end of the flocked surface. When viewed as a whole, the flocking is not too dense, and it becomes a moderate and good feeling of use, and the hair tip easily enters fine irregularities on the tooth surface. As a result, it is possible to wipe off plaque and other dirt with the tip of the hair while wrapping the entire tooth, and it is possible to remove the occlusal surface, interdental part, tooth neck part, etc. It will surely be easy to wipe out.

  Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to the drawings. Fig.1 (a) is an external appearance perspective view which shows the toothbrush of this invention, FIG.1 (b) is the top view which looked at the head part from the top. The toothbrush 10 includes a head portion 11 having a flocked surface 12 extending between a front end 11a and a rear end 11b, and a handle portion 13 extending from the rear end 11b of the head portion 11. The handle portion 13 is a portion that grips the toothbrush 10, and may be formed in an optimal shape for a brushing operation using the toothbrush 10. The head part 11 and the handle part 13 may be formed by integral molding with, for example, a hard resin. The handle portion 13 may be further partially or entirely formed of a flexible resin such as an elastomer to improve gripping properties.

  For example, the forming material of the head part 11 and the handle part 13 is preferably a thermoplastic resin having a flexural modulus of 500 to 3000 MPa (conforming to JIS K7203 or K7171), polyolefin (polypropylene, polyethylene, etc.), polyester (polyethylene terephthalate). , Polytrimethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate (including blend with polyester), polyarylate (including blend with polyester), polyoxymethylene resin, AS resin, ABS resin, cellulose propionate, polyamide Materials such as (nylon), polyurethane, and PMMA resin can be used, but polypropylene is preferable from the viewpoint of price and workability.

  Moreover, when importance is attached to transparency, for example, PCTA resin which is a kind of polyester of Eastman Corporation in the United States is preferable from the viewpoint of cost and dentifrice resistance. In addition, these handles, thermoplastic elastomers (olefins, styrenes, polyesters, urethanes, nylons, etc.), silicone resins, etc. can be combined to make the handle part 13 or the head part 11 a multicolor molded handle. preferable.

  The head part 11 should just be formed in thickness t about 2-6 mm. A plurality of hair bundles 15 in which a number of fine brushes are bundled are arranged (planted) on the flocked surface 12 of the head portion 11. If the brush which comprises the hair | bristle bundle 15 can be used as a toothbrush, conventionally used nylon, polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), etc. can be used. When the brush cross section has a multilayer structure, commonly used polyamide (nylon 6-12, nylon 6-10, 12 nylon, etc.), polyester (polybutylene terephthalate, polyethylene terephthalate, polytrimethylene terephthalate, etc.), polypropylene It is also possible to use the same material or a composite filament combined with each other using a hard resin such as a soft resin such as a thermoplastic elastomer.

  Regarding the coloring of the brush resin, it may be used transparent (natural) as it is, and transparent colored brushes with pigments or dyes or opaque colored (including white) brushes are appropriately used in consideration of the commercial properties of the toothbrush appearance. Selected. If necessary, two or more of them may be used in combination in the hair bundle unit or in the hair bundle, and when the cross section of the same brush has a multi-core sheath structure, partially It can also be used in combination with different materials or colored ones.

  Within the range that does not impair the characteristics of the brush, heat and light stabilizers, flame retardants, fillers, surface lubricants, antistatic agents, antiseptic materials (antibacterial materials), and other hard resins and elastomers May be appropriately blended or applied. The brush thickness is 3 to 12 mil (1 mil = 1/1000 inch, 0.07 to 0.31 mm), preferably 5 to 11 mil (0.12 to 0.28 mm) in terms of usability, cleaning function and durability. good. In the case of highly-tapered hair having a thin brush tip (taper tip diameter of about 10 to 80 μm), it is preferable that the brush diameter on the side of flocking not tapered is 0.12 to 0.30 mm.

  The cross-sectional shape of the brush is usually circular, but it is oval, various polygons including triangles, quadrilaterals, pentagons, hexagons, etc., and non-uniform side lengths. A certain shape may be a combination of straight lines and curves, such as a star shape, a three-leaf or four-leaf clover shape, etc., and an arbitrary shape is selected as necessary, but the cross-section from the point of physical strength A circular shape is preferred because it is balanced.

  Usually, it is the same diameter in one brush except for the rounded end of the hair, but it may be twisted at a certain pitch toward the long axis direction of the brush, wave treatment, crimp treatment etc. In the vicinity of the base of the hair bundle, it may be in the form of highly tapered hair (for example, the diameter of the tip portion is 0.01 to 0.08 mm) having the above-mentioned brush thickness and gradually decreasing in diameter toward the brush tip. Further, the tip shape of the brush portion may be processed into a spatula shape, a scraper shape, a spherical shape, or the like.

  The brush length as the distance from the flocked surface 12 of the head portion 11 to the brush tip in the vertical direction is appropriately selected according to the hair bundle specification and the brush specification in consideration of the feeling of use, the cleaning effect, etc. 8 to 12 mm for children and 6 to 10 mm for children.

  As a method of implanting the hair bundle 15 in the head portion 11, it can be fixed to the head portion 11 by a conventional method. For example, the hair bundle is fixed with a flat wire (a retaining member such as brass, stainless steel, or hard resin). Flat wire flocking to be folded in two, flocking one end of the hair bundle by means of heat or the like, and in-mold flocking in which the head portion resin is filled and fixed in a state where the connecting portion is in the mold (for example, JP 61-268208, JP 9-512724, etc.), heat fusion flocking (for example, see JP-A-60-241404) or the like in which one end of the hair bundle and the head portion are melt-bonded by means of heat or the like. be able to.

  When fixing the brush to the head part of the toothbrush, if the packing factor is 60 to 100%, the fuzzing is good, the appearance is excellent, the opening of the hair is excellent, the tip of the hair can be used efficiently, and the brushing effect High toothbrush. Here, the packing factor is a method of fixing the brush with a flat wire in a flocked hole formed in advance on the flocked surface of the head portion, or in the case of a heat fusion method, one to a plurality of brushes to be fixed. A value obtained by dividing the sum of the cross-sectional areas by the cross-sectional area of the flock holes is multiplied by 100 and expressed in%.

  However, in the case of the method using a flat wire, the value is obtained by subtracting the area seen from the cross-sectional direction of the flock hole in the flat flock hole from the flock hole cross-sectional area. Also, in the case of the in-mold method or the heat fusion method, if there is no pre-planted hole in the head part, instead of the cross-sectional area of the flocked hole, a hair bundle (or brush) is used when fixing to the head part. Divide by using the hole cross-sectional area of the jig to hold.

  The angle of the hair bundle or brush to be planted does not necessarily have to be perpendicular to the hair surface of the head part. For example, for the purpose of enhancing the scraping effect in a specific direction, the head part in which the hair bundle is implanted In some cases, the hair is inclined at an angle of 15 ° to 20 ° with respect to the surface of the hair. About the hair cutting shape of the flocked portion, generally, it may be appropriately selected such as flat cutting with a uniform plane, mountain cutting with a top, step cutting with a plurality of flat heights, etc. Various shapes can be combined by using a cutting process, a hair-separation device, or the like. Usually, each hair end portion is rounded. Moreover, it may not go through a hair-cutting process with highly tapered hair, and in that case, it is not necessary to perform the hair rounding process.

  The hair bundle 15 to be implanted on the flocked surface 12 of the head part 11 includes a large-diameter hair bundle 15a arranged in a substantially U shape along the periphery of the flocked surface 12 near the front end 11a of the head part 11, and the head part 11 and a small-diameter bristle bundle 15b disposed near the rear end 11b. The large-diameter hair bundle 15a has, for example, a total of six large-diameter hair bundles 15a in a substantially U shape, two near the front end 11a along the outer periphery of the front end side A of the flocked surface 12 and two on each side. It only has to be arranged. In particular, the hair bundle 15 arranged facing the front end 11a of the flocked surface 12 may be the largest diameter hair bundle 15c having the largest diameter. For example, three small-diameter hair bundles 15b may be arranged on the inner side surrounded by the maximum-diameter hair bundle 15c and the large-diameter hair bundle 15a. The hair bundle 15 arranged facing the front end 11a of the flocked surface 12 may be a hair bundle having the same diameter as the large-diameter hair bundle 15a connected to both sides of the hair bundle 15c instead of the maximum diameter hair bundle 15c.

  On the other hand, the small-diameter hair bundle 15b having a smaller diameter than the large-diameter hair bundle 15a, which is arranged near the rear end 11b of the head portion 11, is regularly arranged. For example, in FIG. 1, 15 small-diameter hair bundles 15b are arranged. Thereby, the flocking density of the front end side flocking region A surrounding the outer periphery of the flocked range consisting of the maximum diameter bristles 15c and the large diameter bristles 15a arranged in a substantially U shape is the outer periphery of the flocked range of the small diameter bristles 15b. The brushing density is higher than that of the rear end side flocking region B that surrounds, and the brushing effect is particularly enhanced in the front end side flocking region A of the flocked surface 12.

  The cross-sectional shape of the hair bundle 15 is usually circular, but is not necessarily circular, and is an indeterminate shape arbitrarily combining polygons such as triangles and quadrangles, straight lines, and curves in accordance with the design of the flocked portion. It is also good. In particular, in the case of flat line flocking, these bundles of irregular shapes and thin wall hole flocking can be combined to form a linear or curved apparently continuous hair bundle group.

  The hair bundles need not all have the same brush diameter and color. For example, such as 6 mil and 7 mil, or 6 mil and 8 mil, the hair bundle should be selected appropriately in consideration of appearance, usability, brushing feeling, cleaning effect, etc. Can do. Furthermore, different brush materials can be combined, or a rubber-like brush or chip such as silicon or elastomer may be combined.

  The arrangement of the small-diameter hair bundles 15b planted in the rear-end side flocking region B of the flocked surface 12 is usually arranged in a lattice shape or a staggered shape as a hair bundle having a circular cross section, and 2 in the width direction W of the head portion 11. ~ 6 rows (maximum width of the flocked portion on the flocked surface 12 is about 3 to 13 mm), 2 to 8 rows in the length direction L of the head portion 11 (about 5 to 20 mm as the maximum length of the flocked portion on the flocked surface 12) However, the combination of the cross-sectional shapes of the hair bundles and the combination of the arrays can be appropriately selected according to the target function.

The total flocked area (JIS S 3016: flocked area) of the region where the hair bundle 15 is flocked on the flocked surface 12 is small for children and large for adults, but is generally about 0.5 cm ² to 3 cm. It is supposed to be about ² . In addition, the size of the head portion 11 is generally set to a size in which an edge width of about 0.5 to 1 mm is added around a region where the hair bundle 15 is implanted (planted area).

  In addition to scraping off dirt such as plaque at the hair tip while wrapping the whole tooth with the maximum diameter hair bundle 15c and the large diameter hair bundle 15a arranged in a substantially U-shape in the front end side flocking area A of the flocked surface 12. When brushing the buccal side or lingual side of the tooth by scrubbing or the like, in order to make the hair tip more easily reach the interdental part or the curved neck part of the tooth, the maximum diameter hair bundle 15c and the large diameter hair bundle 15a It is also preferable to form a hair-cut shape with a ridged tip or a convex tip.

  In this way, the maximum diameter hair bundle 15c and the large diameter hair bundle 15a are arranged in a substantially U shape near the front end 11a of the flocked surface 12, and in particular, the two maximum diameter hair bundles in the width direction W of the flocked surface 12 at the front end 11a. By using the toothbrush 10 in which the two 15c are juxtaposed and the small-diameter bristle bundle 15b is arranged in the other bristle portion, in addition to the powerful brushing effect by the largest bristle bundle 15c at the front end 11a of the flocked surface 12, it is connected to it. Since the large-diameter hair bundle 15a is arranged in a substantially U shape as a whole, the flocking is not too dense when viewed in the front end side flocking region A of the flocking surface 12, and a proper and good feeling of use is obtained. The tip of the hair is easy to enter even on the uneven surface. As a result, it is possible to wipe off plaque and other dirt with the tip of the hair while wrapping the entire tooth, and it is possible to remove the occlusal surface, interdental part, tooth neck part, etc. It will surely be easy to wipe out.

  With only two hair bundles of the maximum diameter hair bundle 15c at the front end 11a of the flocked surface 12, it is difficult to obtain a strong brushing effect and cannot be arranged in a substantially U shape. good. Further, if the diameter of the large-diameter hair bundle 15a is increased too much, the flocked hair becomes too dense, or it becomes a hard feel as a toothbrush, and it becomes difficult for the hair tips to enter the fine irregularities of the tooth surface. In addition, the hair bundles other than the maximum diameter hair bundle 15c and the large diameter hair bundle 15a do not necessarily have the same hair bundle diameter, and may be combined with hair bundle diameters of two or more levels. Due to the difference in use feeling and brushing effect between A and the rear end side flocked area B, the role in the flocked portion is made different, and the hair bundles other than the maximum diameter hair bundle 15c and the large diameter hair bundle 15a are the same hair bundle. The diameter should be good.

Next, the preferable structural example and its effect | action of the toothbrush of this invention are enumerated.
1. An example of a toothbrush in which the flocking density on the front end side of the flocked surface is higher than the flocked part on the rear end side.
Assuming a toothbrush with a flat-line method of flocking, which is a common flocking method, the `` flocked area '' of a specific area on the flocked surface where the bunch is arranged is shown outside the outer flocked bunch on the outer periphery in that area. Expressed as an area connected by straight lines (according to JIS 3016), and the ratio of the total area occupied by the hair bundle in the area of flocking to the “flocking density”, the flocking density on the front end side of the flocked surface is By making it higher than the flocking density on the rear end side (the flocking density ratio is larger than 1), a strong brushing effect on the front end side of the flocking surface is exhibited.

  The flocking density ratio is greater than 1. However, if the flocking density ratio is too high, the flocking density on the front end side of the flocking surface is relatively high, or conversely, the flocking density on the rear end side is low. It is too much, and the flocking balance of the whole flocked surface is lost, and a good feeling of use and a brushing effect cannot be obtained. Therefore, the ratio of flocking density on the front end side of the flocked surface and flocking density on the rear end side is 2 Hereinafter, it is preferably 1.5 or less, more preferably 1.4 or less or 1.3 or less.

  The ratio of the flocking density on the front end side of the flocked surface and the flocked density of the whole flocked surface may be the same, and the ratio of flocked density is greater than 1, but at most 2 or less, preferably 1. It should be 5 or less, more preferably 1.4 or less to 1.3 or less.

  In addition, when dealing with the area of flocked hair and the area of the hair bundle, if it is a toothbrush with a flocking method using a flat wire that is normally used, it can be measured based on the flocked hole opened on the flocked surface of the head part, If the flocking hole on the flocked surface of the head part is not clear, such as mold flocking, heat fusing flocking, or similar, and a flocking method that does not use a flat wire, the root of the hair bundle on the flocked surface of the head part Measure with reference to the shape that smoothly connects the outer circumference of the wire or use the hole cross-sectional area of the jig to hold the hair bundle when fixing to the head part in the flocking process without using a flat wire Good.

2. An example of a toothbrush in which the flocked area on the front end side of the flocked surface is smaller than the flocked area on the rear end side.
Since the front end side of the toothbrush surface of the toothbrush is able to scrape dirt such as plaque with the hair tip while wrapping the whole tooth, a certain amount of flocking area is necessary, but the rear end side of the flocking surface (or If it occupies a large area ratio with respect to the entire flocked surface), the balance of the entire flocked surface will be lost, and a good feeling of use and brushing will not be obtained. The ratio of the flocked area on the end side is less than 1, and is 0.4 or more, preferably 0.8 or more. The ratio between the flocked area on the front end side of the flocked surface and the flocked area of the whole flocked surface may be the same, and the ratio of the flocked area is less than 0.5, 0.3 or more, preferably 0.4 or more. Good.

3. An example of a toothbrush in which the flocking density on the front end side of the flocked surface is higher than that on the rear end side, and the flocked area on the front end side of the flocked surface is narrower than the flocked area on the rear end side.
By having both the features of the configuration examples 1 and 2 described above, a good feeling of use and a brushing effect can be obtained.

4). An example of a toothbrush in which at least one small-diameter bristle bundle having different bristle bundle diameters is formed inside a large-diameter bristle bundle that is substantially U-shaped along the periphery on the front end side of the flocked surface.
By arranging the large-diameter hair bundle in a substantially U shape along the peripheral edge on the front end side of the flocked surface, and arranging at least one small-diameter hair bundle having different hair bundle diameters on the inside thereof, the substantially U-shape is arranged. Wraps the whole tooth with a large-diameter hair bundle and keeps the flocking density of the large U-shaped hair bundle moderately without disturbing the removal of dirt such as plaque with the hair tip, and the front end side of the flocked surface is hard Good usability and brushing effect can be obtained without becoming too much.

5). The example of the toothbrush which made the hair | bristle bundle area ratio of a large caliber bristle bundle and a small caliber bristle bundle 1.9-3.2.
The ratio of the hair bundle area between the large-diameter bristle bundle and the small-diameter bristle bundle has a correlation with the number of brushes to be implanted on the flocked surface, and therefore affects the hardness of the hair bundle and the feeling of use. Although the feeling of use can be adjusted to some extent by the brush diameter used when planting the hair and the brush length of each hair bundle in the state of the toothbrush (distance from the planting surface to the tip of the brush), as a typical example, the same brush diameter is used. Assuming that the same brush length is used, if the hair bundle area ratio is too close to 1, there will be no difference in feeling of use between the hair bundle diameters. On the other hand, if the hair bundle area ratio is too large, the difference in the feeling of use between the diameters of the hair bundles becomes too large and the balance becomes poor, and a good feeling of use and a brushing effect cannot be obtained. Therefore, the hole area ratio is preferably 1.9 to 3.2.

  FIG. 2 shows hair bundle arrangement examples (1) to (5) on the flocked surface of the toothbrush of the present invention. In the drawing, the large-diameter hair bundle indicated by a large circle R1 was formed with a diameter of 2.4 mm, and the small-diameter hair bundle indicated by a small circle R2 was formed with a diameter of 1.6 mm. Moreover, the pitch between each hair | bristle bundle was shown in the mm unit in the figure. Moreover, about the Example of these (1)-(5), the flocked area, the flocked area ratio, and the flocked density are shown in Table 1.

  Next, four types of toothbrushes having different hair bundle diameters and hair cutting shapes as shown in Table 2 in the hair bundle arrangement shown in Example (2) were prepared. Nylon 6-12 hair made by DuPont was planted in a flat fold using a flat wire 0.4 to 0.5 mm longer than the hole diameter, and then the hair was cut into a predetermined shape and rounded. . Two types of hair cutting shapes are shown in FIG.

  Using the toothbrush samples of 2-1 to 2-4 of the present invention shown in Table 2, the usability evaluation (7-step absolute evaluation) was performed by six expert panels. In consideration of the feeling of use, an appropriate value was appropriately set as the brush length of the hair cutting. As a comparative example (conventional example), a commercial product in which a combination of a large-diameter hair bundle and a small-diameter hair bundle was planted was used. The comparative example has a tapered head shape, and has four bundles of large-diameter hair bundles (measured hole diameter = about 2.5 mm) in which about 45 nylon hairs (measured) of about 8.2 mil (actually measured) are planted. It is arranged in a rhombus shape, and 19 bundles of small-diameter hair bundles (measured hole diameter of about 1.8 mm) in which about 26 nylon hairs (measured) of about 7.5 mil (actually measured) are planted are arranged at the rear end, and the brush The length is 10 mm (1 mil = 1/1000 inch = 0.0254 mm). The results of such usability evaluation are shown in Table 3.

  According to the results shown in Table 3, the toothbrush of the present invention was within the range of 5.0 to 6.3 among all items in the 7-step evaluation, whereas the toothbrush of the comparative example (conventional example) was 4.3. Stayed in the range of ~ 5.3. The effect of the toothbrush of this invention was confirmed.

  In addition to the above-described examples, Table 4 shows preferable combinations of the diameters of the large-diameter hair bundles and the small-diameter hair bundles, and the hair bundle area ratio.

Drawing 1 is a side view (a) and a top view (b) showing one embodiment of a toothbrush of the present invention. FIG. 2 is a plan view of an essential part showing an embodiment of the bristle bundle arrangement of the toothbrush of the present invention. FIG. 3 is an explanatory view showing an example of the hair cutting shape of the hair bundle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Toothbrush 11 Head part 12 Flocked surface 15 Hair bundle 15a Large-diameter hair bundle 15b Small-diameter hair bundle 15c Maximum-diameter hair bundle

Claims (4)

A toothbrush having a head portion in which a plurality of bunches of bundling brushes are arranged on a flocked surface extending between a front end and a rear end, and a handle portion connected to the rear end of the head portion,
A large-diameter hair bundle arranged in a substantially U shape along the periphery of the flocked surface near the front end of the head portion, and a small diameter arranged near the rear end of the head portion. The hair transplantation density of the front end side flocking region surrounding the outer periphery of the flocking range of the large diameter hair bundle is greater than the flocking density of the rear end side flocking region surrounding the outer periphery of the flocking range of the small diameter hair bundle. Toothbrush characterized by being raised.   The toothbrush according to claim 1, wherein a flocked area of the front end side flocked region on the flocked surface is formed to be narrower than a flocked area of the rear end side flocked region.   It is characterized in that at least one small-diameter hair bundle is arranged on the inner side surrounded by the large-diameter hair bundle arranged in a substantially U shape along the periphery of the flocked surface near the front end of the head portion. The toothbrush according to claim 1 or 2. The toothbrush according to any one of claims 1 to 3, wherein a hair bundle area ratio between the large-diameter bristle bundle and the small-diameter bristle bundle is set to 1.9 to 3.2.

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