Toothbrush

Abstract

To provide a toothbrush which can obtain a high brushing effect in brushing teeth with light force.SOLUTION: A toothbrush 2A includes a long handle 4, a bristle implanting part 6 formed on a tip end of the handle 4, and a brush part 8 formed of a plurality of bristle bundles implanted in the bristle implanting part 6. The handle 4 is constituted of a grip part 10 held by a hand and a neck part 12 which is positioned between the grip part 10 and the bristle implanting part 6 for supporting the bristle implanting part 6 and has a diameter smaller than that of the grip part 10. the brush part 8 is formed into a chevron shape in which a center of the bristle implanting part 6 in a longitudinal direction of the handle 4 is an apex.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a toothbrush used to remove food particles, plaque, and other stains from teeth. [Background technology]

[0002] In conventional toothbrushes, as disclosed in Patent Document 1, for example, the height of the bristle bundles in the brush part is uniform, and the bristle tips are aligned in a plane.

[0003] As described in Patent Document 1, if the bristles of a toothbrush are aligned in a plane, when you try to insert the corresponding bristles into the gaps between your teeth to scrape out dirt, the other bristles may hit the sides of the teeth and prevent them from entering. For this reason, when inserting the bristles into the gaps between your teeth, you need to press the brush head of the toothbrush firmly.

[0004] Incidentally, a survey conducted by an oral care product manufacturer found that people who are conscious of removing stains from their teeth tend to brush with greater force. Because dental professionals provide practical instruction on brushing with appropriate force, most people understand that it is best to brush with appropriate force. While appropriate brushing pressure (how hard the brush presses against the teeth) is said to be approximately 150-200g, few people actually consciously practice this. As mentioned above, when people are conscious of removing stains from their teeth, they naturally brush with greater force. Repeated overbrushing, which involves pressing the brush too hard against the teeth, can damage the gums and result in ineffective removal of stains.

[0005] Furthermore, there are generally two ways to hold a toothbrush: the "pen grip," which is like holding a pencil, and the "palm grip," which is held in the palm of your hand. It has been proven that brushing with light pressure is best for effectively removing dirt, and the pen grip method, which prevents you from applying too much pressure while brushing, is considered particularly desirable.

[0006] Patent Document 2 discloses a toothbrush with a handle that has a circular cross section to make it easier to grip when using the pen grip method. Because the toothbrush is held with only the thumb, index finger, and middle finger when using the pen grip method, a circular shape makes it easier to grip and to rotate the handle to change the brush position. Patent Document 3 also discloses a toothbrush with an oval handle cross section that is thin at the part that is held between the thumb and index finger to prevent users from gripping it too tightly. Conversely, toothbrushes with an oval or elliptical cross section that are thicker at the part that is held between the thumb and index finger are also commercially available.

[0007] As mentioned above, the pen grip method is suitable for brushing with light force. However, because it is held lightly, if the cross section is round, as described in Patent Document 2, the handle tends to rotate around its axis during brushing, causing the intended brushing position (brush position) to shift slightly, and the overall brushing effect of toothbrushing is not necessarily high. Furthermore, as described in Patent Document 3, if the part held between the thumb and index finger is thin and has parallel surfaces, it is tiring to use, and the handle rotates up and down like a seesaw, with the grip as the fulcrum, making it prone to shifting position. This tendency to shift position is similar even for brushes with an oval cross section.

[0008] Furthermore, toothbrushes are generally consumable items and are replaced periodically for hygiene reasons, or when the bristles become loose and the brushing experience becomes less comfortable. However, in recent years, due to environmental concerns and the growing demand for luxury goods, toothbrushes, especially handles, are being sought that allow users to use their own dedicated products for a long time and replace only the worn-out bristles with new ones. In light of this trend, there is a need for toothbrush handles that have designs that suit one's taste or are luxury products. To meet such needs, it is necessary to improve the design of toothbrush handles and make them more luxurious. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2024-054020 [Patent Document 2] Japanese Utility Model Application Publication No. 6-84926 [Patent Document 3] Japanese Patent Application Laid-Open No. 2011-11014 Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in consideration of the above points, and its object is to provide a toothbrush that is easy to hold and provides high brushing effectiveness (efficiency) even when brushing with light pressure. Another object of the present invention is to provide a toothbrush that can effectively enhance design. [Means for solving the problem]

[0011] In order to achieve the above object, the toothbrush (2A) of the present invention comprises a long handle (4), a bristle section (6) formed at the tip of the handle (4), and a brush section (8) consisting of a plurality of bristle bundles (20a, 20b) implanted in the bristle section (6), and is used to clean teeth (30) with the brush section (8). The handle (4) comprises a gripping section (10) to be held by hand, and a neck section (12) positioned between the gripping section (10) and the bristle section (6) to support the bristle section (6) and having a smaller diameter than the gripping section (10), and the brush section (8) is formed in a mountain shape with its apex located at the center of the bristle section (6) in the longitudinal direction of the handle (4).

[0012] With the toothbrush of the present invention, when you brush your teeth by placing the peak of the bristles of the brush part against the gaps between your teeth (gaps between your teeth) or the gaps between your teeth and gums, the other bristles of the brush part do not interfere (hinder) the penetration of the peak bristles, so the bristles can easily penetrate into the gaps between your teeth or the gaps between your teeth and gums (including periodontal pockets), making it easier to scrape out dirt and improving the effectiveness of brushing your teeth.

[0013] Furthermore, in the toothbrush 2A described above, the grip portion 10 may be configured so that the cross section perpendicular to the longitudinal direction of the handle 4 has a triangular shape with the tip of the bristle bundles 20a, 20b at the apex. This allows for highly accurate prevention of the handle from shifting even when held lightly with a pen grip, allowing for effective tooth brushing with an appropriate brushing pressure.

[0014] Furthermore, in the toothbrush 2A, the grip portion 10 may be configured so that its cross-sectional area gradually decreases toward the neck portion 12. This allows for both ease of handling due to the appropriate thickness and ease of holding in a pen-grip position.

[0015] Furthermore, the toothbrushes (2B, 2C) may be configured such that at least a portion of the surface of the grip (10) is decorated with decorations (16, 18). This provides a sense of luxury and allows users greater freedom of product selection when selecting their favorite toothbrush through differentiation.

[0016] Furthermore, the toothbrushes (2B, 2C) may be decorated with lacquerware (16), carved patterns, or textured patterns. This can impart a sense of luxury to the user's taste, further increasing the user's freedom of product selection when selecting their own favorite toothbrush.

[0017] Furthermore, in the toothbrushes (2B, 2C) described above, the neck portion (12) and the bristle portion (6) may be integrally formed, and the neck portion (12) may be detachably attached to the grip portion (10). This configuration eliminates the need to simultaneously replace the grip portion, which has a luxurious feel, when the brush portion deteriorates, which is economical.

[0018] Furthermore, the toothbrushes (2B, 2C) may be configured so that the bristle portion (6) is detachable from the neck portion (12). This configuration allows for minimal replacement of the brush portion when it deteriorates, making it even more economical.

[0019] Furthermore, in the toothbrushes (2A, 2B, 2C) described above, the brush section (8) may include a central bristle bundle group (22) in which a plurality of bristle bundles (20a) are arranged longitudinally in the center of the bristle implantation section (6), and a peripheral bristle bundle group (24) in which a plurality of bristle bundles (20b) are arranged in the bristle implantation section (6) to surround the central bristle bundle group (22), wherein the central bristle bundle group (22) is taller than the peripheral bristle bundle group (24), and the central bristle bundle group (22) and the peripheral bristle bundle group (24) may be configured to have a mountain-like shape with an upward slope from the front end to the rear end and a downward slope from the neck side (12) to the rear end, with the center of the bristle implantation section (6) as the boundary in the longitudinal direction. This allows the bristle to easily reach gaps between teeth and between the teeth and gums, thereby improving the effectiveness of dirt removal.

[0020] Furthermore, in the toothbrushes (2A, 2B, 2C) described above, the number of bristle bundles (20b) at the tip end of the peripheral bristle bundle group (24) may be configured to be less than the number of bristle bundles (20b) at the neck portion (12) side, thereby enabling effective brushing of narrow areas deep inside.

[0021] Furthermore, in the toothbrushes (2A, 2B, 2C) described above, the bristles (h) of at least the central bristle group (22) out of the central bristle group (22) and the peripheral bristle group (24) may be configured to have a conical tapered shape toward the tip. This allows for effective scraping of dirt even in narrow spaces such as between teeth, improving tooth brushing performance.

[0022] Furthermore, the toothbrushes (2A, 2B, 2C) described above may be configured so that the hardness of the central bristle bundle group (22) and the peripheral bristle bundle group (24) differs by varying the thickness or quantity of the bristles of the bristle bundles (20a, 20b). This allows for selectively varying the hardness of the central bristle bundle group and the peripheral bristle bundle group depending on conditions such as the degree of tooth staining and the condition of the gums, thereby achieving both further improved tooth brushing effectiveness and ensuring oral health through an appropriate massaging effect. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a toothbrush that can achieve a high brushing effect even when brushing with light pressure, and also to provide a toothbrush that can effectively enhance design. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a side view of a toothbrush according to a first embodiment of the present invention. [Figure 2] 2A and 2B are diagrams for explaining the configuration of the toothbrush handle shown in FIG. 1, in which (a) is a plan view, (b) is a cross-sectional view taken along line XX in (a), (c) is a bottom view, and (d) is an end view showing the cross-section at positions A to F in (a). [Figure 3] 2 is a cross-sectional end view of the toothbrush shown in FIG. 1 when held in a pen grip style, as viewed from the tip side. [Figure 4] FIG. 10 is an exploded side view of a toothbrush according to a second embodiment. [Figure 5] FIG. 10 is an exploded side view of another example of the toothbrush according to the second embodiment. [Figure 6] FIG. 2 is a perspective view of a brush part of the toothbrush shown in FIG. [Figure 7] 10A and 10B are detailed views of a brush part of a toothbrush according to a third embodiment, in which (a) is a plan view of a tuft of bristles seen from the tip side, and (b) is a side view. [Figure 8] These are enlarged views showing the shape of each individual bristles in the brush part, where (a) is a view of the brush part of the toothbrush shown in Figure 7, and (b) is a view of the brush part of a conventional toothbrush. [Figure 9] 8A and 8B are diagrams illustrating tooth brushing actions, where (a) is a diagram of the brush part of the toothbrush shown in FIG. 7, and (b) is a diagram of the brush part of a conventional toothbrush. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] [First embodiment] As shown in FIG. 1, the toothbrush 2A according to this embodiment includes a long handle 4, a bristle section 6 formed at the tip of the handle 4, and a brush section 8 consisting of multiple bristle bundles attached to the bristle section 6, and is a toothbrush that cleans teeth using the brush section 8. The handle 4 includes a grip 10 that is held by hand, and a neck 12 that is positioned between the grip 10 and the bristle section 6 to support the bristle section 6 and has a smaller diameter than the grip 10. The brush section 8 is formed in a mountain shape with its apex located at the center of the bristle section 6 in the longitudinal direction of the handle 4 (direction of arrow Y) (i.e., the shape of the tip of a group of multiple bristle bundles viewed from the side is a mountain shape). The detailed configuration of the mountain-shaped brush section 8 will be described later.

[0027] The present embodiment aims to provide a toothbrush that can accurately prevent misalignment of the handle 4 (and thus misalignment of the brush head 8 relative to the teeth) even when the handle 4 is held lightly to brush with an appropriate brushing pressure, thereby achieving a high brushing effect. For this reason, the cross section of the gripping portion 10 in the direction (arrow Z direction) perpendicular to the longitudinal direction (arrow Y direction) of the handle 4 has a triangular shape with the apex facing the tip of the bristle bundle (arrow Z1 direction).

[0028] The shape of the toothbrush 2A excluding the brush head 8 will be described in detail with reference to Figure 2. Figure 2(a) is a plan view, (b) is a cross-sectional view of (a) taken along the X-X line, (c) is a bottom view, and (d) is an end view showing the cross sections at positions A, B, C, D, E, and F in (a). As is clear from Figure 2(d), the handle 10 has a shape in which the cross-sectional area gradually decreases toward the neck 12.

[0029] The grip portion 10 of the toothbrush 2A according to this embodiment has a shape particularly suited to being held in a pen grip style. The position for holding the grip portion 10 in a pen grip style is the area D near the neck portion 12 of the grip portion 10 in FIG. 2, and its cross-sectional shape has a triangular shape T with the apex S1 on the side toward the tip of the bristle bundle (the direction of the arrow Z1). The triangular shape T has hypotenuses T1 and T2 formed by arcs with small curvatures, and a base T3. The symbols S2 and S3 indicate the apex on the base T3 side. Each of the apexes S1, S2, and S3 is rounded rather than pointed, and the curvature of the apex S1 is greater than that of the apexes S2 and S3. The cross-sectional area of ​​the triangular shape T gradually decreases toward the neck portion 12, and the sharpness of the apex S1 increases accordingly. When viewed from the neck 12 side, the base T3 of the triangle T is the part supported by the middle finger, the hypotenuse T1 by the thumb, and the hypotenuse T2 by the index finger. In Figure 2(a), the two-dot chain line L1 indicates the change in width of the ridge line of the apex S1. In Figures 2(b) and 2(d), the dot chain line L2 indicates the reference position in the direction of the tip of the hair bundle (direction of arrow Z1).

[0030] As is clear from FIG. 2(d), the neck portion 12 is formed in a rectangular shape with a cross-sectional area that gradually decreases toward the bristle portion 6. The neck portion 12 has a smaller diameter than the grip portion 10 so that it can flex (elastically deform) when the brush portion 8 is placed against teeth. This allows the brush portion 8 to flex (elastically deform) when placed against teeth. As shown in FIG. 2(a), the bristle portion 6 has multiple pores 14 for implanting bristle bundles. Specifically, the pores 14 are composed of six central holes 14a, indicated by black circles, arranged at equal intervals along the longitudinal direction of the grip portion 10 in the widthwise center of the bristle portion 6, and seventeen peripheral holes 14b, indicated by white circles, arranged to surround the central holes 14a. In this embodiment, the grip portion 10, neck portion 12, and bristle portion 6 are integrally molded (formed) from polyethylene terephthalate resin (synthetic resin).

[0031] FIG. 3 shows the toothbrush 2A held in a pen-grip style at position D in FIG. 2(a) on the gripping portion 10, a cross-sectional end view seen from the bristle portion 6 side. The base T3 of the triangular shape T is supported by the middle finger F3, the hypotenuse T1 by the thumb F1, and the hypotenuse T2 by the index finger F2. Even when the gripping portion 10 is lightly held in a pen-grip style, the triangular cross-section prevents it from rotating around its axis and shifting out of position. Even if the gripping portion 10 attempts to shift upward, the thumb F1 and index finger F2 are in contact with it at an angle downward, preventing it from shifting out of position. In other words, the gripping portion 10 is held in a fixed position within the gripping space surrounded by the thumb F1, index finger F2, and middle finger F3, and can only be repositioned by the user's willful hand movements. This allows for highly accurate prevention of shifting of the brush head 8 relative to the teeth during brushing, regardless of the user's will, resulting in a high level of brushing effectiveness. Moreover, the grip portion 10 is not thin and flat as in Patent Document 3, but has a thickness similar to that of a round bar overall, making it easy to hold and reducing fatigue.

[0032] [Second embodiment] The second embodiment will be described with reference to Figures 4 and 5. Parts that are the same as or can be considered the same as those in the first embodiment are designated by the same reference numerals, and the explanations of the configuration and function already given will be omitted as appropriate. This also applies to the other embodiments described below.

[0033] In this embodiment, at least a portion of the surface of the grip portion 10 is decorated. As shown in FIG. 4 , the toothbrush 2B has a neck portion 12 and a bristle portion 6 integrally molded (formed), and the neck portion 12 is detachably attached to the grip portion 10. The entire surface of the grip portion 10 is decorated with lacquer 16 to impart a luxurious feel. The pattern of the lacquer 16 may be selected appropriately according to the user's preferences or may be customized specifically for the user. This allows the toothbrush to be differentiated from conventional disposable toothbrushes, allowing the user to select a toothbrush that best suits their preferences (a so-called favorite toothbrush). The color and pattern of the lacquer 16 can be selected appropriately. The lacquer 16 may also be formed as a seal or sticker attached to the grip portion 10.

[0034] Furthermore, replacing the handle 10, which is finished to give a luxurious feel, along with the brush head 8 every time it deteriorates would be economically wasteful and would place a significant burden on the environment. For this reason, the toothbrush 2B of this embodiment is designed to be detachable so that only the parts other than the handle 10 can be replaced. A male thread 12a is integrally formed at the rear end of the neck 12, and a female thread 10a that screws into the male thread 12a is integrally formed at the tip of the handle 10. The arrangement of the male thread 12a and the female thread 10a between the neck 12 and the handle 10 may be reversed.

[0035] As shown in FIG. 5, toothbrush 2C has a handle 10 and a neck 12 integrally molded (formed), and a bristle unit 6 detachably attached to the neck 12. A decorative geometric pattern 18 is formed on the entire surface of the handle 10 to impart a luxurious feel. The design of the geometric pattern 18 can be selected according to the user's preferences, allowing differentiation from conventional toothbrushes and increasing the user's freedom of product selection when selecting their favorite toothbrush. Because it would be economically wasteful to also replace the handle 10, which is finished to impart a luxurious feel, every time the brush head 8 deteriorates, the bristle unit 6 is detachably configured so that only the bristle unit 6 can be replaced. A male thread 6a is integrally molded at the rear end of the bristle unit 6, and a female thread 12b that threads onto the male thread 6a is integrally molded at the tip of the neck 12. The arrangement of the male thread 6a and the female thread 12b between the bristle unit 6 and the neck 12 may be reversed. The geometric pattern 18 may be formed by a seal or sticker. In this embodiment, the geometric pattern 18 is formed only on the grip portion 10, but it may also be formed continuously on the entire surface of the neck portion 12.

[0036] The decoration applied to the surface of the grip 10 may be a carved or textured pattern. The grip 10 may be made of wood or bamboo, which makes it easy to form a carved or textured pattern.

[0037] Also, although not shown in the figures, if a cover is provided to cover the bristle portion 6 of the toothbrush 2C, the surface of the cover may be decorated with lacquer 16, geometric patterns 18, etc., and if a case is provided to store the toothbrush 2C, the surface of the case may be decorated with lacquer 16, geometric patterns 18, etc.

[0038] [Third embodiment] A third embodiment (details of the brush unit 8 common to toothbrushes 2A, 2B, and 2C) will be described with reference to Figures 6 to 9. The brush unit 8 is designed to more effectively clean between teeth and gaps between the teeth and gums by brushing for a short time with light force. Figure 6 is a perspective view of the brush unit 8. The brush unit 8 includes a central bristle bundle group 22 in which a plurality of bristle bundles 20a (six in this case) are arranged along the longitudinal direction (direction of arrow Y) in the central part of the width direction (direction of arrow W) of the bristle implantation unit 6, and a peripheral bristle bundle group 24 in which a plurality of bristle bundles 20b (17 in this case) are arranged in the bristle implantation unit 6 so as to surround the central bristle bundle group 22. The central hair bundle group 22 has a greater height in the tip direction (arrow Z1 direction) of the hair bundles than the peripheral hair bundle group 24, and the central hair bundle group 22 and the peripheral hair bundle group 24 are formed in a mountain shape (pyramid shape) with the tip side sloping upward toward the rear end and the neck portion 12 side sloping downward toward the rear end, with the center of the tufted portion 6 in the longitudinal direction (arrow Y direction) as the boundary (see Figure 7(b)). The heights of the hair bundles 20a in the central hair bundle group 22 differ depending on the mountain shape, but no distinction is made between them by reference symbols. The same is true for the hair bundles 20b in the peripheral hair bundle group 24.

[0039] FIG. 7(a) is a plan view of the bristle bundles 20a, 20b as viewed from the tip side. The number of bristle bundles on the tip side (arrow Y1 side) of the peripheral bristle bundle group 24 is fewer than the number of bristle bundles on the neck 12 side (arrow Y2 side). That is, there are three bristle bundles 20b on the neck 12 side, while there are two bristle bundles 20b on the tip side. This narrows the width of the tip side of the brush part 8, making it easier to brush the inner part. As shown in FIG. 7(b), both the central bristle bundle group 22 and the peripheral bristle bundle group 24 are formed with a step t while maintaining a mountain-shaped configuration, and the step t is approximately 3 mm. The slope of the mountain-shaped configuration of the central bristle bundle group 22 and the peripheral bristle bundle group 24 is the same.

[0040] Each bristle h constituting the bristle bundles 20a of the central bristle bundle group 22 and the bristle bundles 20b of the peripheral bristle bundle group 24 is made of nylon and has normal hardness. As shown in FIG. 8(a), the bristles h have a conical shape that tapers toward the tip. In this embodiment, the bristles are tapered. FIG. 8(b) shows the shape of the bristles h1 in a conventional toothbrush, and reference numeral 26 indicates the bristle attachment portion of the conventional toothbrush. In this conventional toothbrush, the bristles are uniform in thickness all the way to the tip. In contrast, in the brush head 8 of this embodiment, as shown in FIG. 8(a), the tips of the bristles h are tapered, allowing the tips of the bristles h to penetrate deeper into the gaps between teeth, improving the function of scraping out food debris and removing plaque.

[0041] The advantages of the mountain-shaped brush head 8 (common to the first and second embodiments) will be described with reference to FIG. 9 . In FIG. 9 , reference numeral 28 denotes gums, and reference numeral 30 denotes teeth. Reference numeral 32 denotes the brush head of a conventional toothbrush. As shown in FIG. 9( b), the bristles of the conventional brush head 32 are all the same height, so the tip of the brush head 32 hits the teeth 30 and cannot penetrate into the interdental gaps Tg. This is because the bristles surrounding the bristles prevent the bristles from penetrating the interdental gaps Tg. Therefore, a strong pressure is required to penetrate the interdental gaps Tg, which causes the other parts of the teeth that do not correspond to the interdental gaps Tg to strongly hit the sides of the teeth 30. This results in brushing pressure that far exceeds the appropriate level, damaging the gums and preventing effective tooth removal.

[0042] In contrast, the brush head 8 of the toothbrushes 2A, 2B, and 2C according to the present invention is formed in a mountain-shaped configuration. As shown in FIG. 9(a), the bristles located at the peaks of the mountain-shaped central bristle bundle group 22 can easily penetrate the interdental gaps Tg, scraping out dirt from the interdental gaps Tg with light brushing. Because there is a step between the central bristle bundle group 22 and the peripheral bristle bundle group 24, the peripheral bristle bundle group 24 does not obstruct the peaks of the central bristle bundle group 22 from penetrating the interdental gaps Tg. As tooth brushing with the central bristle bundle group 22 progresses, the bristles of the peripheral bristle bundle group 24 only come into contact with the surfaces of the teeth 30 once the central bristle bundle group 22 is slightly bent. This mountain-shaped configuration allows for two-stage bristle contact for effective tooth brushing. Combined with the tapered shape of the bristles (h) described in FIG. 8, appropriate brushing pressure effectively removes dirt.

[0043] The hardness of the central bristle group 22 and the peripheral bristle group 24 may be different by varying the thickness or volume (number of bristles) of the bristles. For example, the hardness of the central bristle group 22 may be increased when teeth are heavily soiled, and the hardness of the peripheral bristle group 24 may be decreased when gingivitis is present. The hardness of the central bristle group 22 and the peripheral bristle group 24 may also be different depending on the material of the bristles. It is also possible to make the central bristle group 22 and the peripheral bristle group 24 different colors. By making the central bristle group 22 and the peripheral bristle group 24 different colors, the design of the brush part 8 can be improved.

[0044] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments and various modifications are possible within the scope of the claims and the technical concept described in the specification and drawings. For example, the materials of the handle 4 and the brush part 8 are not limited to those described above. Furthermore, the arrangement pattern of the central hole 14a and peripheral holes 14b of the pores 14 in the bristle part 6 (arrangement pattern of the bristle bundles) is also not limited to those described above. Furthermore, the attachment / detachment mechanism in the second embodiment is not limited to screws, but may be snap engagement or the like. [Explanation of symbols]

[0045] 2A, 2B, 2C toothbrushes 4 patterns 6 Hair transplantation area 8 Brush section 10 Gripping part 12 Neck 6a, 12a male thread 10a, 12b female thread 14 pores 14a center hole 14b Peripheral hole 16 Maki-e (decoration) 18 Geometric Patterns (Decorative) 20a, 20b hair bundles 22 Central hair bundle 24 Peripheral hair bundles 28 Gums 30 teeth h hair Tg gap between teeth

Claims

1. A toothbrush comprising a long handle, a bristle section formed at the tip of the handle, and a brush section consisting of a plurality of bristle bundles attached to the bristle section, for cleaning teeth with the brush section, The handle comprises a grip portion to be held by hand, and a neck portion positioned between the grip portion and the bristle portion to support the bristle portion, the neck portion having a smaller diameter than the grip portion; The brush part is formed in a mountain shape with the bristle part having a peak at the center in the longitudinal direction of the handle, The toothbrush is characterized in that the cross section of the gripping portion in a direction perpendicular to the longitudinal direction of the handle has a triangular shape with the tip of the bristle bundle at the apex.

2. 2. The toothbrush according to claim 1, wherein the grip portion has a shape in which the cross-sectional area gradually decreases toward the neck portion.

3. 2. The toothbrush according to claim 1, wherein at least a part of the surface of the grip portion is decorated.

4. 4. The toothbrush according to claim 3, wherein the decoration is a lacquer design, a carved pattern, or a embossed pattern.

5. 5. The toothbrush according to claim 3, wherein the neck portion and the bristle portion are integrally formed, and the neck portion is detachably attached to the grip portion.

6. 5. The toothbrush according to claim 3, wherein the bristle portion is detachably attached to the neck portion.

7. The brush section includes a central bristle bundle group in which a plurality of bristle bundles are arranged along the longitudinal direction in the central part of the bristle implantation section, and a peripheral bristle bundle group in which a plurality of bristle bundles are arranged in the bristle implantation section so as to surround the central bristle bundle group, The toothbrush of claim 1, characterized in that the central group of bristle bundles is taller than the peripheral group of bristle bundles, and the central group of bristle bundles and the peripheral group of bristle bundles are formed in a mountain shape, with the tip side sloping upward toward the rear end and the neck side sloping downward toward the rear end, with the center of the bristle implantation section in the longitudinal direction as the boundary.

8. The toothbrush according to claim 7, wherein the number of bristle bundles on the tip side of the peripheral bristle bundle group is smaller than the number of bristle bundles on the neck side.

9. The toothbrush according to claim 7, wherein, of the central bristle bundle group and the peripheral bristle bundle group, at least each bristles of the central bristle bundle group have a shape that tapers conically toward the tip.

10. 8. The toothbrush according to claim 7, wherein the hardness of the central group of bristle bundles and the peripheral group of bristle bundles is made different by varying the thickness or amount of bristles in the bristle bundles.

Images