JP3794108B2 - toothbrush - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a toothbrush for brushing human teeth.
[0002]
[Prior art]
Currently, a wide variety of toothbrushes are produced and sold by many manufacturers, but the cross-sectional shape of the bristle is almost circular. Other transverse cross-sectional shapes that can be seen in a small number are also concentric shapes having no direction such as polygons.
[0003]
Moreover, in the manufacturing technique which is conventionally performed on the brush base, the degree of freedom in arranging the hair bundle is small and almost uniform.
[0004]
[Problems to be solved by the invention]
By the way, it is generally said that to remove plaque, it is necessary that the tip of the toothbrush hits the plaque on the tooth surface and that the tip of the toothbrush follows the movement of the toothbrush. However, in a conventional toothbrush having circular bristles with a non-directional cross-sectional shape in the conventional manner, in the oral cavity with many irregularities, bias occurs in the part where the bristles are easy to reach, and thus soft gums. The hard tip cannot reach the part in the oral cavity where the hard teeth are next to each other, and the circular hair has no direction, so there is no change in the deflection of the hair, and the tip of the tip in the mouth is not changed. It has been difficult to adjust the strength of hitting, and there have been problems such as insufficient removal of dental plaque and the tendency for hair settling to occur.
[0005]
The present invention has been made in view of the above-described conventional example. By changing the degree of bending of the hair, the reach of the hair tip to a necessary part in the oral cavity is improved and the movement of the toothbrush in a specific direction is achieved. A toothbrush that can improve not only the movement of the toothbrush but also the movement of the toothbrush in an unspecified direction, can improve the plaque removal effect, and can reduce hair sag. It is an issue to provide.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the toothbrush according to the present invention projects a large number of bristles 3 from the brush base 2, and the plurality of bristles 3 includes a plurality of bristles 3A having at least an elliptical cross-sectional shape, The bristle 3A includes a first bristle group 12 arranged such that the elliptical major axis direction D is substantially parallel to the major axis direction Y of the toothbrush 1, and the elliptical major axis direction D is the major axis direction of the toothbrush 1. Y and the second bristle group 13 arranged in a substantially vertical direction, and the elliptical hair 3A is arranged in the substantially central region 2a of the brush base 2 and has a cross-sectional shape other than the elliptical shape on both sides thereof. It has the feature that the hair which has is arrange | positioned, and when the toothbrush 1 is moved to the major axis direction Y of the toothbrush 1 like bath polishing by comprising in this way, the 1st bristle group 12 is comprised. The major axis direction D of the elliptical bristles 3A is parallel to the movement direction of the toothbrush 1. Thus, the elliptical bristles 3A are difficult to bend and the tip of the bristles can follow the movement of the toothbrush 1 well. On the other hand, when rotating the toothbrush 1 like rolling brushing, the first bristle group The long diameter direction D of the elliptical bristles 3A constituting the tooth 12 is parallel to the movement direction of the toothbrush 1, or the long diameter direction D of the elliptical bristles 3A constituting the second bristle group 13 is the movement direction of the toothbrush 1. Since they become parallel, the hair tip can follow the movement of the toothbrush 1 well, and plaque removal effect and hair sag reduction effect can be obtained. In addition, since the elliptical hair 3A is disposed in the substantially central region 2a of the brush base 2, the elliptical hair 3A having rigidity in a portion that is likely to hit the teeth may be applied to the most important part of the oral cavity. This makes it easier to remove plaque. Furthermore, since the hair having a cross-sectional shape other than the elliptical shape is arranged on both sides of the elliptical hair 3 </ b> A (hair group 12, 13), the tip of the elliptical hair 3 </ b> A in the substantially central region 2 a is the toothbrush 1. While following the movement well, the hair having a cross-sectional shape other than an ellipse on both sides of the hair has a low followability, so that it softly hits the oral cavity.
[0007]
In addition, it is preferable that the cross-sectional shape of the hair other than the ellipse is circular, and in this case, the circular hair 3B comes to be located in the peripheral portion that becomes the front row when the toothbrush 1 is applied to the tooth 4, It can also cope with toothbrush movement in an unspecified direction.
[0008]
Moreover, it is preferable to form the shape of the whole arrangement | positioning part of the said bristle in the substantially bowl shape along the major axis direction of a toothbrush seeing from the protrusion direction of a bristle, In this case, the bristles 3 of the toothbrush 1 are applied with respect to teeth. In this case, the hair tips of the second hair group 13 often enter between the teeth, which are points for removing plaque.
[0009]
In addition, it is preferable that the second bristle group in which the major axis direction of the ellipse is arranged in a direction substantially perpendicular to the major axis direction of the toothbrush is arranged in a substantially central region of the two large diameter parts of the bowl shape, In this case, the direction in which the tips of the second bristle group 13 enter and the elliptical major axis direction D of the second bristle group 13 are substantially parallel, so that the bristle of the large-diameter portion 14 is good for toothbrush movement. You can follow.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
A reference example of the present invention will be described below with reference to FIGS.
[0011]
As shown in FIG. 1, the toothbrush 1 is configured such that a large number of hairs 3 are implanted on the upper surface of a brush base 2. The many bristles 3 are not necessarily separate from the brush base 2 and may be formed integrally with the brush base 2 by molding. In the figure, 10 is a handle and 11 is a neck.
[0012]
In the reference example , the plurality of bristles 3 are arranged such that the cross-sectional shape of the bristles 3A arranged in three rows and fifteen rows is elliptical, and the crossing arranged in one column between the columns of the elliptical bristles 3A. The surface shape is composed of circular hairs 3B. Here, the elliptical bristles 3A arranged in three vertical rows and fifteen horizontal rows are the first bristle group 12 arranged such that the major axis direction D of the ellipse is substantially parallel to the major axis direction Y of the toothbrush 1. And the second bristle group 13 in which the major axis direction D of the ellipse is arranged in a direction substantially perpendicular to the major axis direction Y of the toothbrush 1. And the elliptical hair 3A which comprises the 1st hair group 12, and the elliptical hair 3A which comprises the 2nd hair group 13 are alternately arrange | positioned every other in the column direction, and, thereby, the 1st hair group 12 The first hair group 12 and the second hair group 13 are arranged in a mixed state. That is, in the longitudinal direction, the elliptical hair 3A constituting the first hair group 12 and the elliptical hair 3A constituting the second hair group 13 are alternately arranged regularly one by one, In the row direction, the elliptical hair 3A and the circular hair 3B constituting the first hair group 12 are alternately arranged regularly one by one. In addition, arrangement | positioning of the 1st hair group 12 and the 2nd hair group 13 is not limited to the reference example shown in FIG. 1, It can change arbitrarily.
[0013]
Further, the elliptical hair 3A constituting the first hair group 12 and the elliptical hair 3A constituting the second hair group 13 have the same ratio (B / A) of the major axis A to the minor axis B. Of course, it is possible to use ones having different elliptical ratios (B / A). In order to make a difference in rigidity between the major axis direction D and the minor axis direction E of the ellipse, for example, it is desirable that the major axis of the ellipse is 1.1 times or more the minor axis. Furthermore, in order to obtain a soft hit in the oral cavity, it is desirable that the hair 3B having a circular cross-sectional shape is composed of hair having a rigidity lower than that of the elliptical hair 3A. Is preferably 10% or more of the total number of hairs.
[0014]
Thus, the first bristle group 12 arranged such that the major axis direction D of the ellipse is substantially parallel to the major axis direction Y of the toothbrush 1 is connected to the bristles 3 planted on the brush base 2. The elliptical major axis direction D is constituted by the second bristle group 13 arranged in a direction substantially perpendicular to the major axis direction Y of the toothbrush 1, and the first bristle group 12 and the second bristle group 13 are formed. By arranging them in a mixed manner, it is possible to change the degree of deflection of the hair 3. That is, when the toothbrush 1 is moved in the major axis direction Y of the toothbrush 1 like bath brushing, the major axis direction D of the elliptical bristles 3A constituting the first bristle group 12 is the movement direction of the toothbrush 1. Therefore, the elliptical bristles 3 </ b> A are difficult to bend and the bristles can follow the movement of the toothbrush 1 well. On the other hand, when the toothbrush 1 is rotated like rolling brushing, the major axis direction D of the elliptical bristles 3A constituting the first bristle group 12 is parallel to the movement direction of the toothbrush 1, or the second Since the major axis direction D of the elliptical bristles 3A constituting the bristles 13 is parallel to the movement direction of the toothbrush 1, the first bristles 12 or the second bristles 13 also in this rolling brushing. Since any one of the elliptical hairs 3A becomes difficult to bend, the hair tips can follow the movement of the toothbrush 1 well. That is, in both the Y direction and the X direction, which is a general way of moving the toothbrush 1, the hair tips move well corresponding to each, so the plaque removal effect and the hair sag reduction effect And will be obtained. Moreover, since the elliptical hair 3A constituting the first hair group 12 is arranged in the central region of the brush base 2, the hair having rigidity is located in a portion that is likely to hit the tooth, and the plaque is more It becomes easy to be removed.
[0015]
In addition, when the hair 3 is obliquely applied to the tooth 4 as shown in FIG. 2, the tip of the elliptical hair 3A hits the boundary between the hard tooth 4 and the soft gum 5 which are the points of plaque removal, The tip of the hair can be surely reached in the dirt. At this time, the short diameter direction E of the elliptical bristles 3A is the same as the force in the direction in which the toothbrush 1 is applied to the teeth 4, and the elliptical bristles 3A tend to bend in the short diameter direction E. Fits well.
[0016]
As a result, it is possible to change the deflection of the bristles 3 in both cases of bath polishing and rolling polishing, so that the bristles fit firmly on the tooth surface and the bristles 3A are not easily bent, and follow the movement of the toothbrush 1 well. As a result, the effect of removing plaque can be improved and the settling of the hair 3 can be reduced.
[0017]
In this reference example , circular hairs 3B are arranged on both sides of the first bristle group 12 arranged so that the major axis direction D of the ellipse is substantially parallel to the major axis direction Y of the toothbrush 1. Therefore, when the toothbrush 1 is moved in the long axis direction Y or the short axis direction X, the bristles of the elliptical bristles 3A follow the movement of the toothbrush 1 well, while the circular bristles 3B on both sides thereof. Will softly hit the oral cavity. In addition, when the toothbrush 1 is moved in an unspecified direction, the direction of the bristles 3A and 3C can be changed by changing the direction of the toothbrush 1 by arranging the bristles 3C with little followability on both sides. The degree of contact can be adjusted. Therefore, not only the movement of the toothbrush 1 in a specific direction but also the movement of the toothbrush 1 in an unspecified direction can be sufficiently handled, and the plaque removal effect can be further enhanced. In addition, by setting the total number of bristles 3B having a circular cross-sectional shape to 10% or more of the total number of bristles, the bristles 3B can be accommodated by a toothbrush movement in an unspecified direction so that the buccals 3B are softer in the oral cavity. can do.
[0018]
In the reference example shown in FIG. 1, a plurality of elliptical hairs 3A constituting the first hair group 12 and a plurality of elliptical hairs 3A constituting the second hair group 13 are arranged in the vertical direction. Although the case where they are regularly arranged alternately has been described, the arrangement of the elliptical hairs 3A is not limited to this, and may be a random arrangement. In short, the first hair group 12 and the second hair The hair group 13 may be mixed and arranged. Moreover, although the cross-sectional shape of the hair which comprises the 1st hair group 12 and the hair which comprises the 2nd hair group 13 was made into the ellipse whose ratio (B / A) of the major axis A and the minor axis B is equal, A plurality of types of ellipses having different sizes and shapes may be used. Moreover, although the case where the circular hair 3B was arrange | positioned on the both sides of the 1st hair group 12 was demonstrated, you may arrange | position the hair (for example, cross-sectional square hair) other than circular shape. Of course, the circular hair 3B may be omitted. Moreover, you may make it give the roundness to the hair | bristle tip including 3A of elliptical hairs. The same applies to the following .
[0019]
FIG. 3 shows another reference example , in which the first bristle group 12 arranged so that the major axis direction D of the ellipse is substantially parallel to the major axis direction Y of the toothbrush 1 is arranged at the approximate center of the brush base 2. A second bristle group 13 which is arranged in the region 2a and on both sides of the first bristle group 12 and whose elliptical major axis direction D is arranged in a direction substantially perpendicular to the major axis direction Y of the toothbrush 1; Are arranged with non-elliptical hairs. Other configurations are the same as those of the reference example of FIG. In this reference example , circular hairs 3B are used as hairs having a cross-sectional shape other than elliptical, and the circular hairs 3B and the elliptical hairs 3A are alternately arranged in a vertical row one by one. . Thus, the peripheral part used as the foremost row when the toothbrush 1 is applied to the tooth | gear 4 by arrange | positioning the circular hair | bristle 3B with less followability than the 1st bristle group 12 on both sides of the 1st bristle group 12, respectively. The circular hair 3B comes to be located in the middle. That is, when the toothbrush 1 is moved in the major axis direction Y as shown in FIG. 4, elliptical hairs 3A having directionality are arranged in the central region, and circular hairs 3B having no directionality are arranged on both sides. Therefore, it is possible to adjust the contact condition of the hair depending on the part, and it becomes possible to cope with not only the movement of the toothbrush in a specific direction but also the movement of the toothbrush in an unspecified direction, thereby further enhancing the plaque removal effect. it can.
[0020]
FIG. 5 shows still another reference example . In this reference example , a plurality of elliptical bristles 3A are raised in a mountain shape so that the bristles and bristles located in the center in the minor axis direction X of the toothbrush 1 protrude. Other configuration is similar to reference example of FIG. As shown in FIG. 6, the hair tip shape of the elliptical bristles 3 </ b> A arranged in the substantially central region 2 a of the brush base 2 is raised in a mountain shape when viewed from the short axis direction X of the toothbrush 1. In addition, when the hair 3 is obliquely applied to the tooth 4, the tip of the elliptical hair 3 </ b> A in the substantially central region 2 a raised in the mountain shape is more likely to hit the boundary between the tooth 4 and the gum 5. Therefore, the tip of the elliptical hair 3A in the substantially central area 2a efficiently hits a wide area of the tooth 4, fits well and moves well, thereby improving the plaque removal effect and reducing the hair 3 sag. Effect. The inclination angle θ of the chevron of the tip of the elliptical bristles 3A in the substantially central region 2a is 25 ° to 45 ° in consideration of the angle when the bristles 3 of the toothbrush 1 are applied to the tooth surface. desirable.
[0021]
FIG. 7 shows an embodiment of the present invention . In this embodiment, the first bristle group 12 is disposed in a substantially central region 2 a of the brush base 2 so that the elliptical major axis direction D is substantially parallel to the major axis direction Y of the toothbrush 1. At the same time, at least the bristles 3B having a circular cross-sectional shape are arranged on both side areas 2b. In the present embodiment, the hair 3B having a circular cross section and the hair 3A having an elliptical shape are disposed in both side regions 2b. The elliptical hair 3A and the elliptical hair 3A arranged in the substantially central region 2a have different sizes of the elliptical shape. That is, as shown in FIG. 7B, the elliptical hair 3A in the substantially central region 2a has an elliptical shape in which the ratio (B / A) of the major axis A to the minor axis B is sufficiently large. The peripheral elliptical hair 3A has an elliptical shape with a small ratio (B ′ / A ′) between the major axis A ′ and the minor axis B ′. Furthermore, the elliptical bristles 3 </ b> A in the peripheral part include the elliptical bristles 3 </ b> A arranged such that the major axis direction D of the ellipse is parallel to the major axis direction Y of the toothbrush 1, and the major axis direction D of the ellipse is the toothbrush 1. And the elliptical hairs 3A arranged in a substantially vertical direction. Other configurations are the same as those of the reference example of FIG. In this embodiment, the circular hair 3B is slightly rounder than the circular hair 3B and the elliptical hair 3A in the substantially central area 2a in the peripheral portion of the entire arrangement portion of the bristles 3 (the portion that becomes the front row when the toothbrush 1 is applied to the teeth). Since the elliptical bristles 3A close to are arranged, the toothbrush movement in an unspecified direction can be sufficiently dealt with and can be softly applied to the oral cavity.
[0022]
In addition, as shown in FIG. 8, you may make it arrange | position only the circular hair 3B in the circumference | surroundings of the whole arrangement | positioning part of the hair 3. As shown in FIG. In this embodiment, since the bristles 3B having a circular cross-sectional shape are arranged on the periphery of the brush base 2 so as to surround the first bristle group 12 and the second bristle group 13, an unspecified direction Even when the toothbrush 1 is moved, the circular bristles 3B are positioned only in the peripheral portion, which is the front row when the toothbrush 1 is applied to the teeth 4, so that it is possible to cope with the toothbrush movement in an unspecified direction.
[0023]
FIG. 9 shows another embodiment of the present invention . In this embodiment, the shape of the entire arrangement portion of the bristles 3 is formed in a substantially bowl shape along the major axis direction Y of the toothbrush 1 when viewed from the protruding direction of the bristles 3, and the elliptical major axis direction D is the shape of the toothbrush 1. The second bristle group 13 arranged in a direction substantially perpendicular to the major axis direction Y is arranged at least in the substantially central region of the two large-diameter portions 14 of the hook shape. In this embodiment, the first bristle group 12 arranged so that the major axis direction D of the ellipse is substantially parallel to the major axis direction Y of the toothbrush 1 is arranged in the bowl-shaped constricted portion 15. Circular hairs 3B are arranged on the periphery of the hair group 12 and the periphery of the second hair group 13, respectively.
[0024]
Thus, the shape of the entire arrangement portion of the bristles 3 is formed in a bowl shape when viewed from the protruding direction of the bristles 3, so that when the bristles 3 of the toothbrush 1 are obliquely applied to the teeth as shown in FIG. Since the second bristle group 13 in which the major axis direction D of the shape is arranged in a direction substantially perpendicular to the major axis direction Y of the toothbrush 1 is arranged in the substantially central region of the two large-diameter portions 14 of the bowl shape. The hair ends of the second hair group 13 often enter between the teeth, which is a point for removing plaque. Therefore, the bristles of the large-diameter portion 14 can follow the rotational movement of the toothbrush 1 well, for example, when rolling. That is, since the direction in which the bristles enter and the elliptical long diameter direction D of the bristles of the second bristles 13 are substantially parallel, the bristles of the bristles of the large diameter portion 14 can follow the toothbrush movement well. Moreover, since the bristles can invade with the short width of the elliptical bristles 3A, the bristles are more likely to enter the interdental portion. Therefore, since the hair tip enters the interdental portion and moves well, the effect of removing plaque can be further enhanced.
[0025]
FIG. 10 shows an electric toothbrush 6 having at least a reciprocating linear motion function and a reciprocating rotational motion function. As the hair implanted on the brush base 2, the hair 3 including the elliptical hair 3 </ b> A shown in any of the embodiments of FIGS . 7 to 9 is used. Although FIG. 10 shows the case where the hair 3 of the embodiment of FIG. 9 is used, it is not necessarily limited to this. In this embodiment, a drive shaft 8 protrudes from the tip of a main body 7 incorporating a mechanism for performing reciprocating linear motion and reciprocating rotational motion, and a replacement brush 9 integral with the brush base 2 is attached to the drive shaft 8. . Then, the motor built in the main body 7 is rotated in one direction to cause the drive shaft 8 to perform reciprocating linear motion (bus polishing) and reciprocating rotational motion (bus polishing) via the eccentric shaft and cam. During the reciprocating linear movement, the major axis direction D of the elliptical bristles 3A is parallel to the movement direction of the electric toothbrush 6, so that the elliptical bristles 3A are difficult to bend and the bristles can follow the movement of the electric toothbrush 6 well. become. Further, during the reciprocating rotational movement, since the major axis direction D of any of the elliptical bristles 3A is parallel to the movement direction of the electric toothbrush 6, the file elliptical bristles 3A are difficult to bend and the tip of the electric toothbrush 6 You will be able to follow the exercise well. Furthermore, even with the electric toothbrush 16 that is said to be less likely to fit on the tooth surface than the hand toothbrush due to vibration, the use of the bristles 3 including the elliptical hair A provides a good fit with the tooth surface. A feeling can be obtained. Here , in the arrangement structure of the bristles 3 of the embodiment of FIG. 8, it is desirable to use, for example, a so-called automatic bath rolling mode in which bath polishing and rolling polishing are automatically repeated, and the bristles of FIG. 3, FIG. 5, and FIG. In the arrangement structure 3, it is desirable to use in the bath polishing mode, and in the arrangement structure of the hair 3 in FIG. 9, it is desirable to use it in the rolling polishing mode. Of course, it is not limited to this method of use, and it goes without saying that it can be arbitrarily selected and used according to the user's preference.
[0026]
FIG. 11 shows a case where the bristles 3 protruding from the brush base 2 are formed integrally with the brush base 2 or the brush base 2 with the handle 10. As the hair to be planted on the brush base 2, the hair 3 including the elliptical hair 3A shown in the embodiment of FIG. 7 is used. In this embodiment, the hair 3 and the brush base are used. 2 and the handle portion 10 are integrally formed through the neck portion 11. Therefore, in changing the cross-sectional shape of the hair 3 and its arrangement, it becomes easier than the conventional method of flocking, and even when the hair tip is rounded, the tip of the hair is more than the conventional polishing method. Processing can be performed smoothly and reliably. In addition, for example, in the case of a mountain-shaped brush, the rounding process of the hair tip tends to be incomplete in the conventional technique, but the hair tip becomes smooth and soft by integral molding, and the contact in the oral cavity is further improved. There is an advantage that a toothbrush with high safety of use can be easily produced.
[0027]
【The invention's effect】
As described above, the invention according to claim 1 of the present invention has a large number of hairs protruding from the brush base, and the plurality of hairs includes at least a plurality of hairs having an elliptical cross-sectional shape. The bristles are arranged such that the major axis direction of the ellipse is substantially parallel to the major axis direction of the toothbrush, and the major axis direction of the ellipse is arranged in a direction substantially perpendicular to the major axis direction of the toothbrush. It is composed of a second hair group, and the above-mentioned elliptical hair is arranged in the substantially central region of the brush base, and the hair having a cross-sectional shape other than the elliptical shape is arranged on both sides thereof. When the toothbrush is moved in the longitudinal direction of the toothbrush, the major axis direction of the elliptical hair constituting the first bristle group is parallel to the direction of movement of the toothbrush, so that the elliptical hair becomes difficult to bend and the tip of the hair Can better follow the movement of the toothbrush, while rolling When the toothbrush is rotated as in the above, the major axis direction of the elliptical hair constituting the first bristle group is parallel to the movement direction of the toothbrush, or the elliptical hair constituting the second bristle group Since the major axis direction of the bristles is parallel to the movement direction of the toothbrush, the bristles can follow the movement of the toothbrush well. As a result, not only the movement of the toothbrush in a specific direction but also the movement of the toothbrush in an unspecified direction can change the deflection of the hair, so that the bristles fit firmly on the tooth surface and are good for the movement of the toothbrush. It can move following, can improve the effect of removing plaque, and can reduce hair settling. In addition, since the above-mentioned elliptical hair is arranged in the substantially central region of the brush base, the hair having rigidity in the portion that is likely to hit the tooth can be applied to the most important part of the oral cavity, and plaque Is more easily removed. Further, since the bristles having a cross-sectional shape other than the elliptical shape are arranged on both sides of the elliptical hairs (the first hair group and the second hair group), the elliptical hair ends in the substantially central region are toothbrushes. On the other hand, the hair having a cross-sectional shape other than the elliptical shape on both sides thereof has a low followability, so that it softly hits the oral cavity. In other words, by arranging the bristles that do not choose the directionality on both sides of the elliptical bristles, you can adjust the contact condition of the bristles by changing the direction of the toothbrush, depending on the movement of the toothbrush in an unspecified direction It becomes possible to respond, and the plaque removal effect can be further enhanced.
[0028]
In addition to the effect of claim 1, the invention described in claim 2 has a circular cross-sectional shape of the bristles other than an ellipse, so that a circular portion is formed in the front portion when the toothbrush is applied to the teeth. The bristles come to be positioned and can sufficiently cope with the toothbrush movement in an unspecified direction.
[0029]
In addition to the effect of claim 1 , the invention according to claim 3 is formed in a substantially bowl shape along the long axis direction of the toothbrush as seen from the protruding direction of the hair , in addition to the effect of claim 1 . When the toothbrush bristles are applied to the teeth, the bristles of the second bristles often enter between the teeth, which is the point of plaque removal.
[0030]
According to a fourth aspect of the invention, in addition to the effect of the third aspect , the second bristle group in which the major axis direction of the ellipse is arranged in a direction substantially perpendicular to the major axis direction of the toothbrush Since it arrange | positions in the approximate center area | region of two large diameter parts, respectively, since the direction in which the hair | bristle tip of a 2nd hair group enters, and the elliptical long diameter direction of the hair of a 2nd hair group become substantially parallel, The bristles of the large diameter part can follow the toothbrush movement well, and the plaque removal effect is further enhanced.
[Brief description of the drawings]
FIG. 1A is a front view of a reference example of the present invention, and FIG. 1B is an explanatory view of a cross-sectional shape of hair.
FIG. 2 is an explanatory view showing a state in which the bristles of the toothbrush are applied to the tooth surface in an oblique direction.
FIG. 3 is a front view showing another reference example .
FIG. 4 is an explanatory diagram of the movement direction of the toothbrush of FIG. 3;
FIGS. 5A and 5B are a front view and a side view showing still another reference example , respectively.
6 is an explanatory view showing a state in which the hair of the toothbrush in FIG. 5 is applied to the boundary between a tooth and a gum. FIG.
7A is a front view of an embodiment of the present invention, and FIG. 7B is an explanatory diagram of the cross-sectional shape of two types of elliptical hairs.
FIG. 8 is a front view of another embodiment of the present invention .
FIG. 9 is an explanatory diagram of still another embodiment of the present invention .
FIG. 10 is an explanatory diagram of an electric toothbrush according to still another embodiment of the present invention .
FIG. 11 is a side view of still another embodiment of the present invention .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Toothbrush 2 Brush base 2a Approximate center area 3 Bristle 3A Oval bristle 3B Circular bristle 6 Electric toothbrush 12 1st bristle group 13 2nd bristle group 14 Large diameter part D Elliptical long diameter direction E Elliptical Minor axis direction Y Long axis direction of toothbrush X Minor axis direction of toothbrush

Claims (4)

A plurality of bristles protrude from the brush base, and the plurality of bristles include a plurality of bristles having at least a cross-sectional shape of an ellipse, and the ellipse bristles have the major axis direction of the ellipse substantially parallel to the major axis direction of the toothbrush. A first bristle group arranged in such a manner and a second bristle group in which the major axis direction of the ellipse is arranged substantially perpendicular to the major axis direction of the toothbrush, and the ellipse bristle is a brush base A toothbrush characterized in that bristles having a cross-sectional shape other than an elliptical shape are arranged on both sides of the bristles. The toothbrush according to claim 1, wherein the cross-sectional shape of the bristles other than the ellipse is circular . 2. The toothbrush according to claim 1, wherein the shape of the entire bristle arrangement portion is formed in a substantially bowl shape along the long axis direction of the toothbrush as viewed from the protruding direction of the hair . The second bristle group in which the major axis direction of the ellipse is arranged in a direction substantially perpendicular to the major axis direction of the toothbrush is arranged in a substantially central region of the two large diameter parts of the bowl shape, respectively. The toothbrush according to claim 3.

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