JP2017060620A - toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush that can inhibit damage in an oral cavity of a user.SOLUTION: The toothbrush includes: a brush part 12; and a handle body 11 where the brush part is disposed on the tip side. The handle body is formed of a soft resin.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a toothbrush, and more particularly to a toothbrush that can suppress damage to a user's oral cavity.

  Conventionally, when a toothbrush is used (specifically, when the toothbrush is held in the mouth), oral injury may occur, especially when the toothbrush user is an infant of 1 to 3 years old Many cases suffer from oral trauma.

Conventionally, there is a toothbrush disclosed in Patent Document 1 as a toothbrush that can suppress a head portion and a neck portion from being broken or broken.
Patent Document 1 discloses a toothbrush in which a coating layer made of a soft resin covering 70% or more of the total surface area of the head portion and the neck portion is formed on the surface of a base made of hard resin. ing. Patent Document 1 discloses that the total thickness of the head part and the neck part (the total thickness of the base and the coating layer covering the base) is 3 to 5 mm, It is disclosed that the thickness of the base constituting the neck portion is 2 to 4 mm, and the thickness of the coating layer is 0.5 to 2 mm (preferably 0.8 to 1.5 mm).

In Patent Document 1, by adopting the above configuration, even when an excessive load is applied to the head portion or the neck portion, it becomes possible to make the handle body difficult to break, or the head portion or the neck portion is broken. Even in such a case, it is disclosed that it is possible to suppress the exposure of the broken portion by the coating layer. In the toothbrush disclosed in Patent Document 1 having the above-described configuration, since the base constituting the distal end portion of the head portion is covered with a soft resin, the toothbrush is strongly bitten, or the distal end of the head portion hits the oral cavity strongly. When this is done, the soft resin functions as a cushioning material.
For this reason, by using the toothbrush disclosed in Patent Document 1, it is possible to suppress damage in the oral cavity caused by the tip of the head.

JP 2013-458 A

The neck part of the toothbrush disclosed in Patent Document 1 is thinner than the base and made of a soft resin so as to cover the surface of the base (thickness 2 to 4 mm) constituting the neck part. A coating layer (preferably thickness is 0.8 to 1.5 mm) is provided. The head portion of the toothbrush disclosed in Patent Document 1 is, for example, when an external force is applied in the extending direction of the toothbrush (specifically, the direction from the rear end to the front end of the toothbrush). It is difficult to bend so that the external force transmitted to the tip of the head portion is sufficiently released so that the head is not damaged.
Therefore, when a strong external force is applied in a direction from the rear end of the toothbrush to the tip in the state where the toothbrush disclosed in Patent Document 1 is held in the mouth, the user's oral cavity may be damaged.

  The present invention has been made in consideration of the above points, and an object thereof is to provide a toothbrush capable of suppressing damage in the oral cavity of a user.

  According to the first aspect of the present invention, it has a brush portion and a handle body in which the brush portion is arranged on the tip side, and the handle body is made of a soft resin. A toothbrush is provided.

  In the toothbrush according to the aspect of the present invention, the handle body includes a head portion having a brush region in which the brush portion is disposed, and a handle portion disposed on a rear end side of the head portion. The first portion having the lowest bending strength on the distal end side than the handle portion is disposed between the distal end portion of the handle portion and the brush region.

  Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: The said handle | steering-wheel part has a 2nd part which has predetermined | prescribed bending strength, and a 3rd part whose bending strength is smaller than the said 2nd part, It is characterized by the above-mentioned. .

  Moreover, the toothbrush which concerns on 1 aspect of the said invention WHEREIN: The bending strength of the said 1st part is smaller than the bending strength of the said 3rd part, It is characterized by the above-mentioned.

  In the toothbrush according to one aspect of the present invention, the third portion has a cross-sectional shape that is coaxial with the second portion and similar to the cross-sectional shape of the second portion.

  Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: As for the said 1st part, the bending strength of the 1st direction orthogonal to the said brush area | region is orthogonal to the said 1st direction and the length direction of the said handle body. It is characterized by being larger than the bending strength in the second direction.

  Further, in the toothbrush according to one aspect of the present invention, the first soft portion that is disposed from the head portion to a part of the distal end side of the handle portion and is formed of the first soft resin, and the first brush A second soft resin which is disposed on the rear end side from the portion and accommodates at least a part of the first soft portion and is formed of a second soft resin having a hardness lower than that of the first soft resin. And a portion.

  Further, in the toothbrush according to the aspect of the present invention, the first soft portion includes at least a columnar first protruding portion that protrudes and is exposed to the brush portion side in the handle portion, and the brush portion in the handle portion. And a columnar second protrusion that protrudes and is exposed to the opposite side.

  Moreover, the toothbrush which concerns on the one aspect | mode of the said invention WHEREIN: The front end surface of the said 1st protrusion part and the front end surface of the said 2nd protrusion part are flush | level with the outer surface of the said handle part, It is characterized by the above-mentioned.

  In the toothbrush according to the aspect of the present invention, at least a tip portion of the head portion is the second soft portion.

  In the toothbrush according to the aspect of the present invention, the first soft portion in the first portion has a width in a first direction orthogonal to the brush region, the width of the first direction and the handle body. It is characterized by being larger than the width in the second direction orthogonal to the length direction.

  In the toothbrush according to the aspect of the present invention, a second direction orthogonal to the brush region and a length direction of the handle portion is provided between the brush region and the handle portion. A neck portion whose width in the direction is equal to or less than the maximum width of the head portion is arranged.

  In the toothbrush according to one embodiment of the present invention, the soft resin has a hardness of A80 or less.

  According to the toothbrush of this invention, a user's oral cavity damage can be suppressed.

It is a side view of the toothbrush which concerns on 1st Embodiment of this invention. It is a front view of the toothbrush shown in FIG. It is sectional drawing which cut | disconnected the neck part by the YZ plane. It is a side view of the toothbrush which concerns on 2nd Embodiment of this invention. It is a front view of the toothbrush shown in FIG. It is a rear view of the toothbrush shown in FIG. It is the side view to which the 1st soft part shown in FIG. 4 was expanded. It is the front view which expanded the 1st soft part shown in FIG. It is the rear view which expanded the 1st soft part shown in FIG. It is sectional drawing of the AA line direction of the 1st soft part shown in FIG. It is sectional drawing of the BB line direction of the 1st soft part (specifically 1st part) shown in FIG. It is sectional drawing of the CC line direction of the 1st soft part (specifically 2nd part) shown in FIG. It is sectional drawing of the DD line direction of the 1st soft part (specifically 2nd part) shown in FIG. It is sectional drawing which shows the manufacturing process of the toothbrush of this Embodiment, and is a figure for demonstrating the process of forming a 1st soft part using a 1st metal mold | die. It is sectional drawing which shows the manufacturing process of the toothbrush of this Embodiment, and is a figure for demonstrating the process of forming a 1st soft part and a handle part main body using a 2nd metal mold | die. It is a side view which shows the modification of the toothbrush which concerns on embodiment of this invention. It is a front view of the toothbrush shown in FIG.

  Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 17. Note that the drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the size, thickness, dimensions, etc. of each part shown in the drawings may be different from the actual dimensional relationship of the toothbrush. is there. In the first embodiment, a configuration using one type of soft resin is described, and in the second embodiment, a configuration using two types of soft resins having different hardnesses is described, and between the head portion and the handle portion. A description will be given using an example in which a neck portion having a maximum width of the head portion is arranged.

(First embodiment)
FIG. 1 is a side view of a toothbrush according to a first embodiment of the present invention. FIG. 2 is a front view of the toothbrush shown in FIG. 2, illustration of the brush part 12 comprised by the several hair | bristle bundle 12-1 shown in FIG. 1 is abbreviate | omitted for convenience of explanation.

  The X direction shown in FIGS. 1 and 2 indicates the extending (length) direction of the handle body 11 (the extending direction of the neck portion 15) when the toothbrush 10 is not used. The Z direction shown in FIGS. 1 and 2 indicates a first direction (normal direction) orthogonal to the flocked surface (brush region) 21-1b when the toothbrush 10 is not used. The Y direction shown in FIG. 2 indicates the width direction of the toothbrush 10 (in other words, the second direction orthogonal to the Z direction and the X direction).

  With reference to FIGS. 1 to 2, the toothbrush 10 of the present embodiment includes a handle body 11 and a brush portion 12. The handle body 11 includes a head portion 14, a neck portion 15, and a handle portion 16. As will be described later, the handle body 11 is solidly formed of a soft resin. In the present embodiment, the neck portion between the flocked surface 21-1b and the handle portion 16 is smaller in width in the second direction (Y direction) than the width of the head portion 14 (maximum width in the Y direction). 15 is arranged.

  The head unit 14 has a brush region 12A in which the brush unit 12 is disposed. The brush region 12A includes a flocked surface 21-1b facing the + Z side. When the user brushes his / her teeth using the toothbrush 10, the distal end portion of the head portion 14 is a portion facing the user's oral cavity, and is formed in, for example, a rounded shape (round shape). .

  The length (length in the X direction) of the head portion 14 is not particularly limited, and is preferably in the range of 10 to 30 mm, and more preferably in the range of 12 to 28 mm. Moreover, the operativity of the toothbrush 10 in an intraoral area can be improved as the length of the head part 14 is 30 mm or less. The width of the head portion 14 (the maximum width in the Y direction in the head portion 14) is not particularly limited, and is preferably in the range of 7 to 13 mm, and more preferably in the range of 8 to 12 mm. Moreover, the operativity of the toothbrush 10 in oral cavity can be improved as the width | variety of the head part 14 is 13 mm or less. The thickness of the head part 14 in the Z direction is, for example, 5.0 mm. As an example, the thickness of the head portion 14 is a thickness measured at a central portion of the head portion 14 in the X direction.

  Next, the position of the boundary between the rear end of the head portion 14 and the tip of the neck portion 15 and the position of the boundary between the rear end of the neck portion 15 and the tip of the handle portion 16 will be defined with reference to FIG. In the present invention, a portion where the width in the Y direction is the same as the maximum width of the head portion 14 or smaller than the maximum width of the head portion 14 is included in the neck portion between the flocked surface 21-1 b and the handle portion 16.

  In the present embodiment, in the X direction from the front end of the head portion 14 toward the rear end of the handle portion 16, the width in the Y direction becomes narrower, the amount of change in the width increases, and the change in the width in the Y direction eventually. The position where the amount is almost eliminated is defined as the boundary position between the rear end of the head portion 14 and the tip of the neck portion 15. Further, in the X direction from the front end of the neck portion 15 toward the rear end of the handle portion 16, the width in the Y direction becomes wider, the amount of change in the width increases, and eventually the amount of change in the width in the Y direction almost disappears. Is the position of the boundary between the rear end of the neck portion 15 and the front end of the handle portion 16. In the present invention, the position of the rear end side of the handle portion 16 of the flock hole disposed at the position farthest from the front end of the head portion 14 in the X direction from the front end of the head portion 14 is defined as the rear end of the head portion 14. It is good also as a position of a boundary with the tip of neck part 15. The length of the neck portion 15 in the X direction can be set as appropriate within a range of, for example, 20 to 60 mm. In this case, the total length of the head portion and the neck portion is, for example, 40 It can set suitably within the range of -85 mm.

  The neck portion 15 is a region of the toothbrush 10 having the smallest bending strength (hereinafter simply referred to as bending strength) when an external force is applied to the head portion 10. FIG. 3 is a cross-sectional view (hereinafter simply referred to as a cross-sectional view) in which the neck portion 15 is cut along the YZ plane. The neck portion 15 has a substantially elliptical cross-sectional shape cut along the YZ plane. The width W11 in the Z direction at the neck portion 15 is larger than the width W12 in the Y direction at the neck portion 15. Therefore, when an external force is applied to the head portion 14, the neck portion 15 first bends (deforms) in the Y direction, for example, in the deformed portion (first portion) 15A in the central portion of the neck portion 15 in the X direction. .

  The handle portion 16 includes a handle portion main body 31, ring-shaped recess portions 32-1 and 32-2 (ring-shaped recess portions), a first rib portion 34, a second rib portion 35, and a third portion. Rib portion 37. The handle portion main body 31 is a portion that the user of the toothbrush 10 grasps by hand, and the cross-sectional shape cut along the YZ plane is substantially circular.

  The ring-shaped depressions 32-1 and 32-2 are annularly provided over the entire circumferential direction of the handle portion main body 31. The ring-shaped depression 32-1 is configured in a shape in which the diameter of the handle body (second portion) 31 is reduced. That is, the ring-shaped depression 32-1 has a cross-sectional shape orthogonal to the X direction that is coaxial with the handle portion main body 31, is similar, and has a continuously decreasing diameter. The ring-shaped dent portion 32-2 is arranged, for example, 20 mm to 50 mm away from the rear end side of the handle portion 16 with respect to the arrangement position of the ring-shaped dent portion 32-1. The ring-shaped depression 32-2 is configured in a shape obtained by reducing the diameter of the handle portion main body 31. That is, the ring-shaped depression 32-2 has a cross-sectional shape orthogonal to the X direction that is coaxial with the handle portion main body 31 and has a similar shape, and a diameter that continuously decreases.

  The deformed portion (third portion) 32-1A at the portion having the smallest cross-sectional area in the ring-shaped recess portion 32-1 and the deformed portion (third portion) 32 at the portion having the smallest cross-sectional area in the ring-shaped recess portion 32-2. -2A is smaller than the cross-sectional area of the handle body 31. Therefore, the deforming portions 32-1A and 32-2A are regions where the bending strength in the handle portion 16 is the smallest. Further, the bending strength of the deforming portions 32-1A and 32-2A is larger than the bending strength of the neck portion 15. In other words, the bending strength of the neck portion 15 is smaller than the bending strength of the deforming portions 32-1A and 32-2A, and the bending strength of the deforming portions 32-1A and 32-2A is larger than the bending strength of the handle portion main body 31. small.

  A plurality of the first rib portions 34 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-1. A plurality of the second rib portions 35 are arranged in a portion constituting the side surface (in other words, two side surfaces) of the handle portion main body 31 in the ring-shaped recess portion 32-2. A plurality of third rib portions 37 are arranged on the side surface (in other words, two side surfaces) of the handle portion main body 31 located on the rear end side with respect to the arrangement position of the second rib portion 35. The first to third rib portions 34, 35, and 37 can be constituted by the second soft portion 27. In this case, the first to third rib portions 34, 35, and 37 can be collectively formed when the handle portion main body 31 is formed. The first to third rib portions 34, 35, and 37 are not always necessary.

  As described above, the plurality of first ribs 34 disposed in the ring-shaped depression 32-1, the plurality of ring-shaped depressions 32-2 disposed in the ring-shaped depression 32-2, and the second rib section. Since the fingers holding the toothbrush 10 are difficult to slip by having the plurality of third rib portions 37 disposed on the side surface of the handle portion main body 31 located on the rear end side of the arrangement position of the handle portion 35, the handle portion The grip performance of the main body 31 can be improved.

  The handle body 11 is formed of, for example, a soft resin having a hardness of JIS K 7215 Shore A of 90 or less, preferably 80 or less. Examples of such soft resins include elastomer resins such as polyolefin elastomers, styrene elastomers, and polyester elastomers. Specific examples of the styrenic elastomer include, for example, Kuraray Co., Ltd. Septon (trade name), Riken Technos Co., Ltd. Rheostomer (trade name), and the like.

  The brush unit 12 includes a hair bundle 12-1. The length (hair length) of the hair bundle 12-1 can be appropriately set within a range of 6 to 13 mm, for example. The hair bundle 12-1 can be provided on the flocked surface 21-1b by, for example, a heat fusion method in which the lower end of the hair bundle 12-1 is press-fitted into a soft resin constituting the head portion 14 and fixed. In addition, as a method of providing the hair bundle 12-1, in addition to the above-described heat fusion method, the lower end of the hair bundle 12-1 is heated to form a molten mass, and then a molten resin is introduced into the mold. It is possible to adopt an in-mold method or the like, a method in which a cassette provided with the hair bundle 12-1 in advance is attached to the head unit 14, and the like.

  For example, the arrangement and number of the bristles 12-1 may be used as shown in FIG. 2, but the arrangement and number are not limited to this, and a so-called grid-like arrangement or staggered arrangement is possible. Any arrangement pattern such as an arrangement may be used, and the arrangement and number can be appropriately set according to the purpose.

  For example, when an external force is applied to the head portion 14, the deformed portion 15A of the neck portion 15 having the smallest bending strength is first bent and deformed in the Y direction, and then the deformed portion having the small bending strength. 32-1A and 32-2A are bent and deformed. Since the deformed portions 32-1A and 32-2A have a substantially circular cross section, the deformable portions 32-1A and 32-2A are deformed in a direction intersecting the X direction including the Z direction and the Y direction.

  Thus, in this embodiment, since the front-end | tip part of the toothbrush 10 is formed with soft resin, when a user uses the toothbrush 10, since the soft resin 22 functions as a cushioning material, the rear end of the toothbrush 10 When an external force is applied in a direction from the side toward the distal end side and strongly pressed against the user's oral cavity, the user's oral cavity can be prevented from being damaged.

  In addition, in the toothbrush 10 of the present embodiment, when an external force is applied to the head portion 14, the neck portion 15 having the smallest bending strength is deformed, so that the force applied to the tip of the head portion 14 can be released. Therefore, it can suppress that the oral cavity of the user of the toothbrush 10 is damaged. In particular, when the user of the toothbrush 10 is an infant of 1 to 3 years old, it may run with the toothbrush 10 held in the mouth. In such a case, even if the infant falls, the infant It is possible to prevent the oral cavity from being damaged.

  Furthermore, in the toothbrush 10 of this embodiment, since the width W11 in the Z direction is larger than the width W12 in the Y direction and the bending strength is large in the neck portion 15, when brushing teeth using the toothbrush 10, the neck portion 15 Since the tip of the brush part 12 is difficult to deform in the Z direction where force is applied when the tip of the brush part 12 is pressed against teeth or between teeth, the tip of the brush part 12 can be pressed firmly against teeth or between teeth. Is possible. Therefore, in the toothbrush 10 of this embodiment, it is possible to bend in the Y direction at the deformable portion 15A when a strong external force or a weak external force is applied to the tip of the head portion 14 without deteriorating the cleaning performance of the toothbrush 10. Become.

  In addition, as the shape in which the bending strength in the Z direction is larger than the bending strength in the Y direction in the neck portion 15, a rectangle, a rhombus, and the like can be exemplified in addition to the above-described elliptic shape. In this case, the ellipse includes an ellipse in which two semicircles having the same radius are connected by two parallel tangents in addition to a curve formed from a set of points having a constant sum of distances from two focal points. . When the neck portion 15 having an elliptical or rhombic cross-sectional shape is used, the maximum value of the width W11 may be configured to be larger than the maximum value of the width W12.

  Further, in the toothbrush 10 of the present embodiment, the ring-shaped depressions 32-1 and 32-2 are arranged so that the toothbrush 10 is held in the mouth and the rear end of the toothbrush 10 to the tip of the head unit 14. When a strong external force is applied in the direction of heading, the handle portion 16 can be easily bent at the position where the ring-shaped recess portions 32-1 and 32-2 are disposed. As a result, the external force applied in the direction from the rear end of the toothbrush 10 toward the tip of the head portion 14 can be more efficiently released in a direction different from this, so that the oral cavity of the user of the toothbrush 10 is damaged. Can be further suppressed. Moreover, in the toothbrush 10 of this embodiment, since it becomes easy to have the handle | steering-wheel part 16 when a user uses the toothbrush 10 by arrange | positioning the ring-shaped hollow parts 32-1, 32-2, Operability can be improved.

  In the above embodiment, the case where the two ring-shaped depressions 32-1 and 32-2 are provided in the handle body 31 has been described as an example. However, the ring-shaped depressions 32-1 and 32-2 The number is not limited to two. The ring-shaped depressions 32-1 and 32-2 may be provided in the handle portion main body 31 in a number of one or more and five or less as necessary. Further, the arrangement positions of the ring-shaped depressions 32-1 and 32-2 may be provided at an arbitrary position of the handle part main body 31, and the ring-shaped depressions 32-1 and 32- It is not limited to the arrangement position of 2.

(Second Embodiment)
Next, a second embodiment of the toothbrush 10 will be described with reference to FIGS. In these drawings, the same reference numerals are given to the same elements as those of the first embodiment shown in FIGS. 1 to 3, and the description thereof is omitted or simplified. In the first embodiment described above, the structure in which the handle body 11 is formed of one kind of soft resin is exemplified. In the second embodiment, an example using two kinds of soft resins having different hardness will be described.

  FIG. 4 is a side view of the toothbrush according to the second embodiment of the present invention. FIG. 5 is a front view of the toothbrush shown in FIG. In FIG. 5, illustration of the brush part 12 comprised with the several hair | bristle bundle 12-1 shown in FIG. 4 is abbreviate | omitted for convenience of explanation. 6 is a rear view of the toothbrush shown in FIG. FIG. 7 is an enlarged side view of the first soft part shown in FIG. FIG. 8 is an enlarged front view of the first soft part shown in FIG. FIG. 9 is an enlarged rear view of the first soft part shown in FIG.

  As shown in FIGS. 4 to 9, the handle body 11 of the toothbrush 10 in the second embodiment includes a first soft part 17 and a second soft part 27. The 1st soft part 17 is formed with the 1st soft resin. The 2nd soft part 27 is formed with the 2nd soft resin whose hardness is smaller than the 1st soft resin. The second soft part 27 accommodates at least a part of the first soft part 17 therein. As an example, the first soft portion 17 is made of a soft resin having a hardness of JIS K 7215 Shore A of 80 of the soft resins exemplified in the handle body 11 described in the first embodiment. The second soft portion 27 is, for example, a soft resin having a hardness of JIS K 7215 Shore A of 30 or 60 (preferably a hardness of 30) among the soft resins exemplified in the handle body 11 described in the first embodiment. It is formed with.

  The first soft part 17 has a base member 21 and a core part 25. The base member 21 is disposed in the head portion 14 and includes a base member main body 21-1 and two support portions 21-2. The base member main body 21-1 reduces the outer shape of the head part 14 by about 1 to 2 mm so that the second soft part 27 can be disposed on the side surface and the bottom surface 21-1a of the base member main body 21-1. The shape is different. The base member main body 21-1 has a tip portion 21-1A, a bottom surface 21-1a, a flocked surface 21-1b, and a flocked hole 21-1B.

  The tip portion 21-1A is a portion of the base member main body 21-1 that is located on the opposite side to the side where the head portion 14 and the neck portion 15 are connected. The tip portion 21-1 </ b> A is a portion facing the user's oral cavity when the user brushes teeth using the toothbrush 10. The shape of the tip portion 21-1A may be, for example, a rounded shape (round shape).

  FIG. 10 is a cross-sectional view of the base member 21 shown in FIG. Referring to FIG. 4, FIG. 6, FIG. 7, FIG. 9, and FIG. 10, the bottom surface 21-1a is a portion covered with the second soft part 27, and is disposed on the opposite side of the flocked surface 21-1b. ing. The bottom surface 21-1a can be, for example, a flat surface. The flocked surface 21-1b is a flat surface. The flocked surface 21-1b exposes a plurality of flocked holes 21-1B. The flocked surface 21-1b is exposed from the second soft part 27 as the first exposed part in the head part 14. As described above, the base member main body 21-1 is configured using a resin harder than the second soft portion 27, and the plurality of flocked holes 21-1 B and the flocked surface 21-1 b are exposed from the second soft portion 27. By doing it, the hair | bristle bundle 12-1 which comprises the brush part 12 can be planted (planted) with respect to the several planting hole 21-1B, for example using a flat-wire planting method. In addition, the method of planting the hair | bristle bundle 12-1 in the base member main body 21-1 is not limited to the flat wire flocking method, You may select the heat-fusion method mentioned above, an in-mold method, a cassette system, etc.

  When the second soft part 27 is resin-molded by using a second mold 51 shown in FIG. 15 to be described later, the flocked surface 21-1b and the inner surface of one mold 51-2 (see FIG. 15) It is the surface that comes into contact. In this way, when the flocked surface 21-1b is in contact with the inner surface of one mold 51-2 constituting the second mold 51, the plurality of flocked holes 21-1B and the flocked surface 21-1b are secondly connected. The formation of the soft portion 27 can be suppressed.

  A plurality of flocking holes 21-1B are provided in the base member main body 21-1 on the side constituting the flocking surface 21-1b. The flocking hole 21-1B is a hole into which the hair bundle 12-1 constituting the brush portion 12 is flocked. As the arrangement of the plurality of flock holes 21-1B, for example, an arrangement as shown in FIG. 5 can be used, but is not limited thereto, and any arrangement such as a so-called grid-like arrangement or a staggered arrangement may be used. It may be an array pattern. Moreover, the number of the plurality of flocking holes 21-1B is not limited to the number of flocking holes 21-1B shown in FIG. 5, and can be set as appropriate within a range of, for example, 10 to 60 holes. That is, the arrangement of the plurality of flocking holes 21-1B and the number of flocking holes 21-1B can be appropriately set according to the purpose. The shape of the flock hole 21-1B is not particularly limited, and for example, a perfect circle shape, a circular shape such as an ellipse, a polygonal shape such as a triangular shape or a quadrangular shape, or the like can be used. Moreover, the diameter of the flock hole 21-1B can be determined according to the thickness of the hair | bristle bundle 12-1, and can be suitably set within the range of 1-3 mm specifically, for example.

  When the thickness of the head portion 14 in the Z direction is 5.0 mm, the thickness of the base member main body 21-1 in the Z direction (in other words, the thickness between the bottom surface 21-1a and the flocked surface 21-1b) is For example, it can be set to 4.2 mm. In this case, the depth of the plurality of flocking holes 21-1B with respect to the flocking surface 21-1b can be set to, for example, 2.5 mm. As an example, the thickness of the head portion 14 is a thickness measured at a central portion of the head portion 14 in the X direction.

  The two support portions 21-2 are provided so as to protrude in the Z direction (downward in the case shown in FIG. 4) from the bottom surface 21-1a of the base member main body 21-1. One of the two support portions 21-2 is disposed on the front end side of the base member main body 21-1, and the other is disposed on the rear end side of the base member main body 21-1. The two support portions 21-2 are arranged to face each other in the X direction. The two support portions 21-2 each have a protruding surface 21-2a that is a flat surface. The two protruding surfaces 21-2 a are exposed from the outer surface of the second soft portion 27 and are flush with the outer surface of the second soft portion 27. That is, as shown in FIG. 6, the support portion 21-2 is exposed on the side opposite to the flocked surface 21-1 b as the second exposed portion in the head portion 14.

  When the first soft part 17 including the base member main body 21-1 is molded using the first mold 41 shown in FIG. 14 to be described later, the protruding surface 21-2a is formed with the first mold 41 (FIG. 14)). As described above, the protruding surface 21-2a is in contact with the inner surface of the first mold 41 (see FIG. 14), so that the second soft portion 27 is formed around the two support portions 21-2 and the bottom surface 21-1a. Can be formed. That is, the protrusion amount of the two support portions 21-2 (in other words, the distance to the protrusion surface 21-2a with respect to the bottom surface 21-1a) is the second soft portion 27 arranged on the bottom surface 21-1a. Is equal to the thickness in the Z direction. Therefore, the protrusion amounts of the two support portions 21-2 can be set as appropriate according to the thickness of the second soft portion 27 disposed on the bottom surface 21-1a. When the thickness of the head portion 14 in the Z direction is 5.0 mm and the thickness of the base member main body 21-1 in the Z direction is 4.2 mm, the protruding amount of the two support portions 21-2 is, for example, 0 .8 mm. The thickness of the head part 14 and the base member main body 21-1 is a thickness measured at the center part in the X direction in the head part 14 as an example. 4 and 6, the case where there are two support portions 21-2 has been described as an example, but the number of support portions 21-2 may be one or more and is not limited to two.

  The thickness of the second soft portion 27 disposed on the side surface and the bottom surface 21-1a of the base member main body 21-1 can be appropriately set within the range of 0.2 to 2.0 mm, for example, depending on the purpose. Although it is possible, it can be 0.8 mm, for example. 4 to 6, as an example, the case where the second soft portion 27 is provided so as to cover the side surface and the bottom surface 21-1a of the base member main body 21-1 has been described as an example. The soft part 27 should just be arrange | positioned so that the front-end | tip part 21-1A of the base member main body 21-1 may be covered at least.

  The core portion 25 extends in the X direction (the extending direction of the neck portion 15) and penetrates the neck portion 15, and extends in the X direction, with one end being a first portion. 25-1 and a second portion 25-2 disposed in a part of the handle portion 16. Here, the first portion 25-1 constituting the neck portion 15 will be described, and the second portion 25-2 will be described when describing the configuration of the handle portion 16.

  11 is a cross-sectional view of the first soft portion 17 shown in FIG. 7 in the BB line direction. One end of the first portion 25-1 is configured integrally with the rear end of the base member 21, and the other end is configured integrally with the second portion 25-2.

  The first portion 25-1 has the same thickness in the X direction. When a strong external force is applied to the tip of the head part 14, the neck part 15 is bent at a deformed part 15A shown in FIG. 5 (for example, near the center of the neck part 15) (in other words, the tip of the head part 14). The thickness and shape of the first portion 25-1 and the thickness of the soft portion 26 disposed around the first portion 25-1 may be determined so that the force applied to the first portion 25-1 is released. Specifically, the area of the cut surface of the neck portion 15 obtained by cutting the central portion in the X direction of the neck portion 15 with a surface orthogonal to the X direction (the cut surface 25 of the first portion 25-1). Area S1 of the first portion 25-1 and the area S1 of the cut surface 25-1a of the first portion 25-1. Is preferably 5% or more and less than 50%.

  As the shape of the first portion 25-1 when cut along a plane orthogonal to the X direction, for example, a circular shape, an elliptical shape, a square, a rectangular shape, a diamond shape, a star shape, or the like can be used. In consideration of the safety of the user, the corner of the first portion 25-1 is preferably rounded (round shape). As described above, when brushing teeth using the toothbrush 10, the neck portion 15 is in the Z direction (in other words, the direction in which a force is applied when the tip of the brush portion 12 is pressed against the teeth or between teeth). On the other hand, since it is preferable that it is difficult to be deformed (in other words, it is possible to firmly press the tip of the brush portion 12 against teeth, teeth or the like), the Z direction (perpendicular to the flocked surface 21-1b). The first width W1 of the first portion 25-1 in the first direction) is preferably larger than the second width W2 of the first portion in the Y direction (second direction) orthogonal to the Z direction. . The first width W1 is, for example, 1.5 mm to 3.0 mm, and the second width W2 is, for example, 1.5 mm to 2.0 mm.

  As a cross-sectional shape of the first portion 25-1 in which the first width W1 of the first portion 25-1 in the Z direction is larger than the second width W2 of the first portion in the Y direction, FIG. Examples include ellipses, rectangles, and rhombuses as shown in FIG. In this case, the ellipse includes an ellipse in which two semicircles having the same radius are connected by two parallel tangents in addition to a curve formed from a set of points having a constant sum of distances from two focal points. . When the first portion 25-1 having an elliptical or rhombic cross-sectional shape is used, the first width W1 may be configured so that the maximum value of the first width W1 is larger than the maximum value of the second width W2. Moreover, in FIG. 11, when the diameter R1 of the neck portion 15 is 3.95 mm, the first width W1 can be set to 1.975 mm, for example. At this time, the second width W2 can be set to 1.7 mm, for example.

  In the neck part 15, the 2nd soft part 27 accommodates the 1st part 25-1 inside. The second soft portion 27 prevents the first portion 25-1 from being exposed, and causes the deformable portion 15A of the neck portion 15 to bend when a strong force is applied to the tip of the head portion 14. Deform. In FIG. 11, as an example, the case where the outer shape of the cut surface of the second soft portion 27 is circular has been described as an example, but the present invention is not limited to this. For example, when using the 1st part 25-1 by which the cut surface 25-1a shown in FIG. 11 was made into the ellipse shape, as a cut surface of the 2nd soft part 27, for example, a part of long axis cut | disconnected An elliptical shape that coincides with the long axis of the surface 25-1a or the above-described elliptical shape may be used. Further, when the cut surface 25-1a is elliptical, oval, or polygonal, the diameter R1 of the neck portion 15 may be set to a value according to the circumscribed circle of the cut surface 25-1a.

  FIG. 12 is a cross-sectional view of the first soft portion 17 shown in FIG. FIG. 13 is a cross-sectional view of the first soft portion 17 shown in FIG. 7 in the DD line direction. In the X direction, the second portion 25-2 is similar in which the cross-sectional shape orthogonal to the X direction is continuously expanded from one end of the second portion 25-2 toward the plurality of columnar protrusions 29. It is configured as a shape. That is, the second portion 25-2 is configured such that the diameter of the portion provided with the plurality of protruding portions 29 is the largest. Further, the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of projecting portions 29 increases from the plurality of projecting portions 29 toward the rear end side of the handle portion 16. The cross-sectional shape orthogonal to the X direction is a similar shape whose diameter continuously decreases.

  As described above, the shape of the portion of the second portion 25-2 that is disposed on the rear end side of the handle portion 16 with respect to the plurality of protruding portions 29 has a shape that decreases in diameter toward the rear end side. Accordingly, for example, as shown in FIG. 15 to be described later, after the first soft portion 17 is arranged in the second mold 51, the second mold is formed from the rear end side of the second mold 51. When the second soft resin is introduced into 51, the second soft resin easily moves (flows) in the direction toward the tip of the head portion 14 (X direction), so the entire first soft portion 17 ( However, the flocked surface 21-1b and the plurality of flocked holes 21-1B can be accurately wrapped with the second soft resin. As will be described later, when the second soft resin is introduced into the second mold 51, the first soft portion in the second mold 51 is introduced by the introduced second soft resin. It can suppress that the position and attitude | position of 17 change.

  In the case of the present embodiment, four protrusions 29 are provided as an example. The four protruding portions 29 are arranged in the circumferential direction of the thickest portion of the second portion 25-2. An angle formed by two projecting portions 29 arranged at adjacent positions can be set to 90 degrees, for example. A space formed between two projecting portions 29 arranged at adjacent positions functions as a path for introducing a soft resin into a second mold 51 shown in FIG. 15 described later. The soft resin is supplied to the distal end side of the head portion 21 through the space and is hardened (cured) to become the second soft portion 27.

  Each of the plurality of protruding portions 29 has a protruding surface 29a. The projecting surfaces 29a of the plurality of projecting portions 29 are exposed from the outer surface of the handle portion main body 31 (in other words, the outer surface of the handle portion 16) and face the outer surface of the handle portion main body 31 (the outer surface of the handle portion 16). It is comprised so that it may become one. As shown in FIGS. 4, 5, and 13, the protruding portion 29 as the first protruding portion located on the + Z side is exposed to the flocked surface 21-1 b side through the opening 31 a of the handle portion main body 31. The protruding portion 29 as the second protruding portion located on the −Z side is exposed to the side opposite to the flocked surface 21-1b through the opening 31b of the handle portion main body 31 (second soft portion 27). The protruding portion 29 located on the + Y side is exposed to the + Y side through the opening 31 c of the handle portion main body 31. The protruding portion 29 located on the −Y side is exposed to the −Y side through the opening 31 c of the handle portion main body 31. As shown in FIGS. 4 and 5, the second soft portion 27 in the handle portion 16 has a tapered portion 31A that tapers toward the distal end side, and the openings 31a to 31d are formed in the tapered portion 31A. Is formed. In other words, the protruding portion 29 is exposed to the outside through the openings 31 a to 31 d formed in the tapered portion 31 </ b> A of the handle portion 16.

  As shown in FIG. 13, since the cross-sectional shape of the outer surface of the handle portion 16 is substantially circular, the cross-sectional shape of the protruding surface 29a is an arc shape. Accordingly, each projecting surface 29a is exposed to the outside in the radial direction and exposed to the length direction of the toothbrush 10 and the direction orthogonal to the radial direction. Specifically, for example, in FIG. 13, the protruding surface 29a of the protruding portion 29 as the first protruding portion positioned on the + Z side is exposed facing the + Z side, and exposed facing the + Y side and the −Y side. To do. Similarly, for example, in FIG. 13, the projecting surface 29 a of the projecting portion 29 as the second projecting portion located on the −Z side is exposed facing the −Z side and exposed facing the + Y side and the −Y side. To do.

  The plurality of protrusions 29 are formed by using the second mold 51 (see FIG. 15) to dispose the first soft part 17 in the space 53 of the second mold 51 and molding the handle part body 31. In doing so, the posture of the first soft portion 17 in the space is maintained together with the two support portions 21-12 constituting the base member 21 by the protruding surface 29 a coming into contact with the inner surface of the second mold 51. It has functions (details will be described later). In a state where the first soft part 17 is accommodated in the second mold 51, the four projecting parts 29 have four projecting surfaces 29 a coming into contact with the inner surface of the second mold 51 from four directions. The rear end of the first soft part 17 is supported.

  The protruding amount of the plurality of protruding portions 29 is equal to the thickness of the second soft portion 27 disposed around the plurality of protruding portions 29. Therefore, the protrusion amounts of the plurality of protrusions 29 are flush with the surface of the second soft part 27 according to the desired thickness of the second soft part 27 arranged around the plurality of protrusions 29. The value can be set as appropriate. In FIG. 13, when the diameter R2 of the second portion 25-2 is 5.6 mm, the protruding amount T1 of the plurality of protruding portions 29 can be set to 1.77 mm, for example.

Note that, as an example of the plurality of protrusions 29, the case of having four protrusions 29 has been described as an example, but the number of the plurality of protrusions 29 is not limited to four. For example, the number of the plurality of protrusions 29 may be, for example, three (in this case, the angle formed by the protrusions 29 arranged at adjacent positions is 120 degrees), or two or more 8 No more than two. Further, the shape of the plurality of protrusions 29 may be a shape having a flow path that allows the soft resin to flow from the rear end side of the plurality of protrusions 29 to the front end side of the base member 21, and is cylindrical. It is not limited to. The cross-sectional shape of the plurality of columnar protrusions 29 may be, for example, a star shape or a heart shape excellent in design.
The other structure of the handle body 11 is the same as that of the handle body 11 in the first embodiment.

  FIG. 14 is a cross-sectional view showing the manufacturing process of the toothbrush of the present embodiment, and is a diagram for explaining the process of forming the first soft part 17 using the first mold. FIG. 15 is a cross-sectional view showing the manufacturing process of the toothbrush of the present embodiment, for explaining the process of forming the second soft part 27 using the second mold and the first soft part 17. FIG. 14 indicates the direction in which the first soft resin is introduced, and the arrow illustrated in FIG. 15 indicates the direction in which the second soft resin 27 is introduced.

  Next, the manufacturing method of the toothbrush 10 of this Embodiment is demonstrated. In the process shown in FIG. 14, a pair of molds 41-1 and 41-2 is formed, and a first soft resin is introduced into the space 43 corresponding to the shape of the first soft portion 17 and the space 43. A first mold 41 having an introduction port 45 is prepared. The mold 41-2 has a protrusion (not shown) for forming a plurality of flocking holes 21-1B. Further, the introduction port 45 is disposed on the rear end side of the space 43.

  Next, the space 43 is filled with a molten first soft resin (a soft resin with a Shore A hardness of 80) serving as a base material of the first soft portion 17 through the introduction port 45, and the first When the soft resin is cured, the first soft portion 17 in which the base member 21 including the plurality of flocked holes 21-1B and the support portion 21-2, the core portion 25, and the plurality of protruding portions 29 are integrated is formed. Is done. Thereafter, the first soft part 17 is taken out from the first mold 41.

  Next, in the step shown in FIG. 15, the space 53 corresponding to the shape of the toothbrush 10 excluding the brush portion 12 shown in FIG. A second mold 55 having an inlet 55 for introducing the soft resin is prepared. The joint surfaces of the pair of molds 51-1 and 51-2 are set, for example, at an intermediate position in the Z direction of the second soft part 27 (handle part body 31) shown in FIGS. 11 to 13. The mold 51-2 is formed with protruding portions (not shown) for forming a plurality of flocking holes 21-1B. The introduction port 55 is disposed on the rear end side of the space 53. In addition, the second mold 51 is formed with ring-shaped depressions 32-1 and 32-2, a first rib 34, a second rib 35, and a third rib 37 shown in FIG. Protrusions are provided for doing so.

  Next, the first soft portion 17 is disposed at the tip of the space 53 of the second mold 51. At this time, the inner surface of the mold 51-2 and the flocked surface 21-1b are brought into contact so that the plurality of flocked holes 21-1B are covered, and the end surfaces of the two support portions 21-2 and the mold 51-1. Further, the plurality of (in the case of this embodiment, four) projecting surfaces 29a of the projecting portions 29 and the inner surface of the second mold 51 are brought into contact with each other.

  Thereby, in the space 53 of the second mold 51, the second soft resin (the hardness of Shore A is 30) which becomes the second soft portion 27 (the soft resin constituting the soft portion 26 and the handle portion main body 31). When the first soft portion 17 is introduced, the position and posture of the first soft portion 17 in the second mold 51 can be maintained.

  That is, the protruding surface 29a of the protruding portion 29 located on the + Z side is in contact with the inner surface of the mold 51-2, and the protruding surface 29a of the protruding portion 29 positioned on the −Z side is in contact with the inner surface of the mold 51-1. Thus, the first soft portion 17 is positioned in the Z direction. In addition, since both the protruding portion 29 located on the + Z side and the protruding surface 29a of the protruding portion 29 located on the −Z side face the + Y side and the −Y side, the die 51-1 and the die 51. -2 is also positioned in the Y direction by contacting the inner surface. In addition, the first soft portion 17 and the second mold 51 are configured such that the end surfaces of the two support portions 21-2 and the projecting surfaces 29 a of the plurality of projecting portions 29 come into contact with the inner surface of the second mold 51. A gap for forming the second soft part 27 can be ensured between the two.

  Next, the melted second softness is filled into the space 53 through the introduction port 55. The inner surfaces of the mold 51-1 and the mold 51-2 at a position corresponding to the tapered portion 31 </ b> A are shortened so that the inner surfaces of the mold 51-1 and the mold 51-2 taper toward the distal end side. Thus, the first soft portion 17 is prevented from moving toward the tip side. Therefore, the first soft portion 17 is positioned without moving in the X direction even when the resin pressure of the molten soft resin filled through the introduction port 55 is applied. Then, the 2nd soft part 27 is formed by hardening soft resin. Parting lines of minute protrusions are formed on the surface of the soft portion 26 at a position facing the joint surface of the mold 51-1 and the mold 51-2 (substantially intermediate position in the Z direction). As a result, the handle body 11 having the head portion 14, the neck portion 15, and the handle portion 16 is formed. Thereafter, the handle body 11 is taken out from the second mold 51.

  Next, as shown in FIG. 4, the hair bundle 12-1 is implanted in the plurality of flocking holes 21-2 of the head portion 11. Thereby, the toothbrush 10 of this embodiment shown in FIG. 4 is manufactured.

  As described above, in the toothbrush 10 of the present embodiment, since both are formed of a soft resin, the same functions and effects as those of the toothbrush 10 of the first embodiment can be obtained. Since the hardness of the first soft portion 17 is larger than the hardness of the second soft portion 27 and the bending strength in the Z direction of the first soft portion 17 in the neck portion 15 is larger than the bending strength in the Y direction, the toothbrush When the teeth are brushed using 10, the neck portion 15 is not easily deformed in the Z direction in which force is applied when the tip of the brush portion 12 is pressed against the teeth or between the teeth. Can be pressed firmly between teeth or between teeth. As described above, in the present embodiment, by appropriately selecting the hardness of the first soft part 17 and the hardness of the second soft part 27, the safety when a strong external force is applied to the toothbrush 10, and the brush part It becomes possible to make it easy to make the 12 tips firmly press against the teeth or between the teeth.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

  For example, the first soft portion 17 and the second soft portion 27 described in the above embodiment may be configured using different types of soft resins having different hardnesses, or the same type of soft resins having different hardnesses. The structure using may be sufficient. Further, the hardness of the first soft part 17 and the hardness of the second soft part 27 exemplified in the above embodiment are merely examples, and the hardness of the second soft part 27 is smaller than the hardness of the first soft part 17. You may use soft resin of other hardness.

Moreover, in the said embodiment, although the structure which the 2nd soft part 27 is arrange | positioned at the front-end | tip part of the head part 14 was illustrated, it is not limited to this, The side view of FIG. 16 and the front view of FIG. As shown in FIG. 5, the configuration may be such that the deformed portion 15A in the neck portion 15 is included and the second soft portion 27 is provided on the rear end side from the deformed portion 15A.
Further, as the toothbrush, the present invention can be widely applied to a so-called one-tuft toothbrush having a single hair bundle, a toothbrush having a tongue coating auxiliary removing portion, and the like.

  Moreover, in the said embodiment, the width | variety of the said 2nd direction (Y direction) is smaller than the width | variety of the head part 14 (maximum width of a Y direction) between the flocking surface 21-1b and the handle | steering-wheel part 16. Although the toothbrush 10 in which the neck portion 15 is disposed has been described, the present invention is not limited to this configuration. For example, the width in the Y direction between the flocked surface 21-1b and the handle portion 16 is A toothbrush in the case where the same portion as the maximum width exists is also included in the present invention. In this case, the deformed portion is disposed as the neck portion, and at least a part of the first soft portion 17 is accommodated in the rear end side from the deformed portion, and is formed of a soft resin. The second soft part 27 is arranged.

  DESCRIPTION OF SYMBOLS 10 ... Toothbrush, 11 ... Handle body, 12 ... Brush part, 14 ... Head part, 15 ... Neck part, 15A ... Deformation part (1st part), 16 ... Handle part, 17 ... 1st soft part, 21 ... Base Member, 21-1 ... base member main body, 21-1a ... bottom surface, 21-1b ... flocking surface (brush area), 21-1B ... flocking hole, 21-2 ... support part, 21-2a ... protruding surface, 25 ... Core portion, 25-1 ... first portion, 25-1a ... cut surface, 25-2 ... first portion, 27 ... second soft portion, 29 ... projection portion, 29a ... projection surface, 31 ... handle portion Main body (second part), 31A ... Tapered part, 32-1A ... Deformed part (third part), 32-2A ... Deformed part (third part), 34 ... First rib part, 35 ... Second rib Part 37 ... third rib part 41 ... first mold 41-1, 41-2, 51-1, 51-2 ... Die, 43, 53 ... Space, 45, 55 ... Inlet, 51 ... Second mold, R1, R2 ... Diameter, S1, S2 ... Area, T1 ... Projection amount, W1 ... First width, W2 ... First Width of 2

Claims (13)

Brush part,
A handle body on which the brush portion is disposed on the tip side,
The toothbrush characterized in that the handle body is made of a soft resin. The handle body includes a head portion having a brush region in which the brush portion is disposed, and a handle portion disposed on a rear end side of the head portion,
The toothbrush according to claim 1, wherein the first portion having the lowest bending strength on the distal end side than the handle portion is disposed between the distal end portion of the handle portion and the brush region.   The toothbrush according to claim 2, wherein the handle portion has a second portion having a predetermined bending strength and a third portion having a bending strength smaller than that of the second portion.   The toothbrush according to claim 3, wherein the bending strength of the first portion is smaller than the bending strength of the third portion.   The toothbrush according to claim 3 or 4, wherein the third portion has a cross-sectional shape that is coaxial with the second portion and similar to the cross-sectional shape of the second portion.   The first portion has a bending strength in a first direction orthogonal to the brush region that is greater than a bending strength in a second direction orthogonal to the first direction and the length direction of the handle body. The toothbrush according to any one of claims 2 to 5. A first soft part that is arranged from the head part to a part on the tip side of the handle part and is formed of a first soft resin;
At least a part of the first soft part disposed at the rear end side from the first part is accommodated therein, and is formed of a second soft resin having a hardness lower than that of the first soft resin. A second soft part;
The toothbrush according to any one of claims 2 to 6, wherein the toothbrush is included.   The first soft portion includes at least a columnar first protrusion that protrudes and is exposed to the brush portion side at the handle portion, and a columnar second protrusion that protrudes and is exposed to the opposite side of the brush portion at the handle portion. The toothbrush according to claim 7, further comprising a protrusion.   The toothbrush according to claim 8, wherein a distal end surface of the first projecting portion and a distal end surface of the second projecting portion are flush with an outer surface of the handle portion.   The toothbrush according to any one of claims 7 to 9, wherein at least a tip part of the head part is the second soft part.   The first soft portion in the first portion has a width in a first direction orthogonal to the brush region, as compared to a width in a second direction orthogonal to the first direction and the length direction of the handle body. The toothbrush according to claim 7, wherein the toothbrush is also large.   Between the brush region and the handle portion, a width in a first direction orthogonal to the brush region and a second direction orthogonal to the length direction of the handle portion is equal to or less than a maximum width of the head portion. The toothbrush according to any one of claims 2 to 11, wherein a neck portion is disposed.   The toothbrush according to any one of claims 1 to 14, wherein the soft resin has a hardness of A80 or less.

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