toothbrush

Abstract

To provide a toothbrush that allows for smooth brushing and thorough cleaning of the back teeth. [Solution] The connecting body is located between a first brush body and a gripping portion and a first brush body, and comprises a second brush body positioned away from the first brush body and a third brush body positioned between the first brush body and the second brush body. The first brush body has a first support formed in a U shape along the circumferential direction and a first brush portion extending from the first support body. The second brush body has a second support formed in a U shape and a second brush portion extending from the second support body. The third brush body is formed in a U shape and comprises a connecting portion that connects the first support body and the second support body in the depth direction, and a third brush portion extending from the connecting portion. The first support body and the second support body are elastically deformable in the depth direction and can move relative to each other in deformation regions located at both ends in the circumferential direction, and at least one of the first brush portion, the second brush portion and the third brush portion is provided in the deformation region.

Description

【Technical Field】 【0001】 The present invention relates to a toothbrush. 【Background Art】 【0002】 As a toothbrush for sweeping the entire dentition collectively, Patent Document 1 discloses a mouthpiece-type and electrically driven toothbrush. The electric toothbrush disclosed in Patent Document 1 includes a mouthpiece disposed on a support so that a cleaning element, which is a brush part, engages with substantially all teeth on at least one of the upper and lower jaws of a user at the same time, and an electric drive unit that is detachably fixed to the mouthpiece and has at least one vibration element for performing a vibration motion and serves as a grip part. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Translation of PCT International Publication No. 2019-520919 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 The mouthpiece has a brush part provided on a support. By moving the mouthpiece left and right while holding it in the mouth, the back teeth can be polished. However, due to the difference between the curvature of the support of the mouthpiece and the curvature of the dentition, the support may collide with the back teeth and the brushing operation may be hindered. In this case, there arises a problem that the back teeth cannot be sufficiently cleaned. 【0005】 Also, when the support is strongly pushed in to polish the back teeth, the brush part is excessively bent and the tips of the bristles cannot be used for polishing, so there also arises a problem that the back teeth cannot be sufficiently cleaned. 【0006】 This invention has been made in consideration of the above points, and aims to provide a toothbrush that allows for smooth brushing and can thoroughly clean the back teeth. [Means for solving the problem] 【0007】 The present invention has the following aspects. [1] The gripping part, A connecting body is connected to one side of the gripping portion in the depth direction perpendicular to the meshing direction, It has, The aforementioned connecting body, A first brush body located on one side in the depth direction from the gripping portion, A second brush body is positioned between the gripping portion and the first brush body in the depth direction, and is positioned away from the first brush body, A third brush body is positioned between the first brush body and the second brush body in the depth direction, It has, The first brush body is A first support is formed in a U-shape along the circumferential direction centered on the axis extending in the meshing direction, A first brush portion extending from the first support to the other side in the depth direction, It has, The second brush body is A second support formed in a U-shape along the circumferential direction, A second brush portion extending from the second support to one side in the depth direction, It has, The third brush body is A U-shaped structure formed along the circumferential direction, with at least a portion of it being a connecting portion that connects the first support and the second support in the depth direction, A third brush portion extending from the connecting portion to both sides in the meshing direction, It has, The first support and the second support are elastically deformable in the depth direction and can move relative to each other in the deformation regions located at both ends in the circumferential direction. A toothbrush in which at least one of the first brush portion, the second brush portion, and the third brush portion is provided in the deformation region. [2] The connecting portion has a recess in the deformation region that is located closer to at least one of the first support and the second support than to the center in the depth direction. The toothbrush described in [1] above. [3] The recess opens outward at both ends in the circumferential direction. The toothbrush described in [2] above. [4] The second support in the deformation region is elastically deformable and movable in the depth direction. The second side surface of the second support on the other side in the depth direction has a first inflection point that occurs with elastic deformation in the depth direction, The first inflection point is located in the range from the second end to 50% of the second circumference, with respect to the second circumference length from the circumferential center of the second support to the second end in the circumferential direction. A toothbrush as described in any one of the above items [1] to [3]. [5] When a predetermined load is applied to the second end of the second support on the other side in the depth direction, Let H01 be the displacement of the second end on the second side surface. If H02 is the displacement amount at a position moved from the inflection point toward the center in the circumferential direction by the circumference from the first inflection point to the second end, H01>H02 Satisfying the relationship, The toothbrush described in [4] above. [6] The first support in the deformation region is elastically deformable and movable in the depth direction. The first side surface of the first support on one side in the depth direction has a second inflection point that occurs with elastic deformation in the depth direction, When a predetermined load is applied to one side in the depth direction at the first end portion in the circumferential direction on the first support, the first side surface from the second inflection point to the first end portion has an arc shape in which the center of curvature is located on one side in the depth direction rather than the first side surface. The toothbrush according to any one of [1] to [5] above. [7] When a predetermined load is applied to the third end portion in the circumferential direction in the meshing direction, the third end portion in the circumferential direction in the connecting portion is elastically deformed and movable in the meshing direction independently of the first support and the second support. The toothbrush according to any one of [1] to [6] above. 【Effect of the Invention】 【0008】 In the present invention, it is possible to provide a toothbrush capable of sufficiently cleaning the back teeth. 【Brief Description of the Drawings】 【0009】 [Figure 1] It is a front view of the toothbrush 1 of the present invention. [Figure 2] It is an external perspective view in the first embodiment of the mouthpiece portion 20. [Figure 3] It is a cross-sectional view taken along line B-B in FIG. 2. [[ID=3l]] [Figure 4] It is a cross-sectional view taken along line C-C in FIG. 1. [Figure 5] It is a front view excluding the connection locations of the first brush portion 41, the second brush portion 71, and the gripping portion 10 from the first brush body 30, the second brush body 60, and the third brush body 80. [Figure 6] It is a partially enlarged view showing the operation of the mouthpiece portion 20. [Figure 7] It is a partially enlarged view showing the operation of the mouthpiece portion 20. [Figure 8] It is a partially enlarged view showing the operation of the mouthpiece portion 20. [Figure 9] It is a partially enlarged view showing the operation of the mouthpiece portion 20. [Figure 10A]This figure shows a schematic configuration of a measuring device for measuring the mouthpiece portion 20. [Figure 10B] This figure shows a schematic configuration of a measuring device for measuring the mouthpiece portion 20. [Figure 10C] This figure shows a schematic configuration of a measuring device for measuring the mouthpiece portion 20. [Figure 11] This is a cross-sectional view AA in Figure 5. [Figure 12] This is a magnified view illustrating the deformation characteristics of the mouthpiece section 20. [Figure 13] This is a magnified view illustrating the deformation characteristics of the mouthpiece section 20. [Figure 14] This is a partially enlarged view of the mouthpiece portion 20 according to the second embodiment of the present invention. [Figure 15] This is a partially enlarged view of the mouthpiece portion 20 according to the second embodiment of the present invention. [Figure 16] Figure 14 is a cross-sectional view of the DD. [Figure 17] This is a front view of the mouthpiece portion 20 according to the third embodiment of the present invention. [Figure 18] This is a front view of the mouthpiece portion 20 according to the third embodiment of the present invention. [Modes for carrying out the invention] 【0010】 Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to Figures 1 to 18. The following embodiments represent one aspect of the present invention and are not intended to limit it. They can be modified at will within the scope of the technical idea of ​​the present invention. Furthermore, in the following drawings, the scale and number of components in each structure differ from the actual structure in order to make the components easier to understand. 【0011】 In the coordinate systems shown in each figure, the Z-axis direction is the occlusal direction and is the vertical direction parallel to the direction in which axis J extends. The θ-direction is the circumferential direction centered on axis J and is the direction along the dentition. In this embodiment, the circumferential direction includes not only the direction along the arc centered on axis J, but also the direction along the tangent to the arc. The Y-axis direction is the direction perpendicular to the θ-direction and the Z-axis direction and is the depth direction within the oral cavity. In the following explanation, the direction parallel to the Z-axis direction will be called the "occlusal direction". The maxillary side, which is the positive side in the Z-axis direction, will be called the "upper side", and the mandibular side, which is the negative side in the Z-axis direction, will be called the "lower side". The positive side in the θ-direction will be called the "left side", and the negative side in the θ-direction will be called the "right side". The lingual side, which is the positive side in the depth direction, will be called the "inner side", and the buccal side, which is the negative side in the depth direction, will be called the "outer side". The "inner side" corresponds to "one side in the depth direction". The "outer side" corresponds to "the other side in the depth direction". 【0012】 Figure 1 is a front view of toothbrush 1. As shown in Figure 1, the toothbrush 1 is a mouthpiece-type toothbrush and has a gripping part 10 and a connecting part 20. Hereinafter, the connecting part 20 will be referred to as the mouthpiece part 20. The mouthpiece portion 20 is subjected to vibration via the gripping portion 10. A shaft 14 protrudes from the gripping portion 10 and is connected to the mouthpiece portion 20. Alternatively, the shaft 14 protruding from the mouthpiece portion 20 may be connected to the grip portion 10. The mouthpiece portion 20 is subjected to vibration from the gripping portion 10 via the shaft 14. 【0013】 The present invention is applicable to any configuration in which a brushing motion is manually applied from the gripping part 10 to the mouthpiece part 20 in the up-and-down, left-and-right, front-and-back, and combinations thereof; a configuration in which vibration is manually applied; or a configuration in which vibration is electrically applied from the gripping part 10 to the mouthpiece part 20. In this embodiment, an electric drive unit is provided on the gripping portion 10, and a configuration is described in which vibrations generated by the operation of the electric drive unit are applied to the mouthpiece portion 20. 【0014】 The electric drive unit comprises a power supply unit 11, a vibration element 12, and a control unit 13. The control unit 13 drives the vibration element 12 using power from the power supply unit 11. The power supply unit 11 is composed of, for example, a rechargeable battery or a battery. The vibration element 12 is composed of, for example, a piezoelectric element, an electromagnetic acoustic transducer, an unbalanced motor, etc. The vibration generated by the vibration element 12 is a vibration that rotates around an axis extending in the depth direction, and repeatedly reverses the direction of rotation at a constant predetermined rotation angle. In the gripping section 10, the shaft 14 connected to the electric drive unit vibrates by repeatedly reversing its direction of rotation. As the shaft 14 vibrates due to the drive of the vibrating element 12, the mouthpiece section 20 vibrates by repeatedly reversing its direction of rotation. 【0015】 [First embodiment of the mouthpiece portion 20] The mouthpiece section 20 includes a first brush body 30, a second brush body 60, and a third brush body 80. The first brush body 30 is located inward in the depth direction from the gripping section 10. The second brush body 60 is located between the gripping section 10 and the first brush body 30 in the depth direction, and is positioned away from the first brush body 30. The second brush body 60 is connected to the gripping section 10. 【0016】 When the mouthpiece portion 20 is placed in the oral cavity, the first brush body 30 is positioned on the lingual side, which is inside the dental arch. When the mouthpiece portion 20 is placed in the oral cavity, the second brush body 60 is positioned on the buccal side, which is outside the dental arch. 【0017】 The first brush body 30 includes a first support 31 and a first brush portion 41. The first support 31 supports the base end of the first brush portion 41. When viewed from above, the first support 31 is formed in a U-shape (horseshoe shape) along the circumferential direction centered on the axis J. The first support 31 is U-shaped with an opening on the inside. 【0018】 The second brush body 60 includes a second support 61 and a second brush portion 71. The second support 61 supports the base end of the second brush portion 71. When viewed from above, the second support 61 is formed in a U-shape (horseshoe shape) along the circumferential direction centered on the axis J. The second support 61 is U-shaped with an opening on the inside. 【0019】 The range in which the first brush body 30 and the second brush body 60 face the dentition is not limited to the entire dentition, but may be configured so that only a portion of the anterior teeth (central incisors, lateral incisors), canines, and posterior teeth (first premolars, second premolars, first molars, second molars) face each other. 【0020】 Figure 2 is an external perspective view of the mouthpiece section 20, seen from the inside in the depth direction. Figure 3 is a cross-sectional view of BB in Figure 2. As shown in Figures 2 and 3, the dimensions of the first support 31 in the meshing direction are largest on the outer side in the depth direction and gradually decrease towards the inside. The upper end of the first support 31 is located at its highest point on the outer side in the depth direction and gradually slopes downward towards the inside. The lower end of the first support 31 is located at its lowest point on the outer side in the depth direction and gradually slopes upward towards the inside. 【0021】 The dimensions of the second support 61 in the meshing direction are largest on the outer side in the depth direction and gradually decrease towards the inside. The upper end of the second support 61 is located at its highest point on the outer side in the depth direction and gradually slopes downward towards the inside. The lower end of the second support 61 is located at its lowest point on the outer side in the depth direction and gradually slopes upward towards the inside. 【0022】 The maximum meshing dimension of the second support 61 on the outside in the depth direction is greater than the maximum meshing dimension of the first support 31 on the outside in the depth direction. The minimum meshing dimension of the second support 61 on the inside in the depth direction is greater than or equal to the minimum meshing dimension of the first support 31 on the inside in the depth direction. The meshing dimension of the second support 61 is larger overall in the depth direction than the meshing dimension of the first support 31. 【0023】 Figure 4 is a cross-sectional view of CC in Figure 1. As shown in Figure 4, the first brush portion 41 is provided on the first support 31 with vertical spacing between them. The first brush portion 41 is provided on the upper end and lower end of the first support 31, respectively. The first brush portion 41 extends outward in the depth direction from the outer brush surface 31a in the depth direction of the first support 31. When viewed from above, the brush surface 31a has portions that are curved along the circumferential direction in a convex direction outward. 【0024】 This embodiment is a toothbrush 1 that uses a first brush section 41 arranged along the dental arch and is intended to be moved manually or electrically. Because the brush surface 31a is curved, the first brush section 41 can be positioned along the lingual side of the dental arch, improving cleaning performance and fit. In addition, it is possible to maximize the contact area of ​​the first brush section 41, which contributes to improved vibration efficiency and cleaning power in the case of an electric toothbrush. 【0025】 The first brush section 41 includes first brush sections 41A, 41B, and 41C, and first brush sections 41D, 41E, and 41F. The first brush sections 41A, 41B, and 41C, and the first brush sections 41D, 41E, and 41F extend outward in the depth direction from the brush surface 31a. The first brush section 41A extends outward from the upper end of the brush surface 31a. The first brush section 41B extends outward from a position lower than the first brush section 41A. The first brush section 41C extends outward from a position lower than the first brush section 41B. The first brush section 41D extends outward from the lower end of the brush surface 31a. The first brush section 41E extends outward from a position higher than the first brush section 41D. The first brush section 41F extends outward from a position above the first brush section 41E. The first brush sections 41, including the first brush sections 41A, 41B, 41C and the first brush sections 41D, 41E, 41F, are provided in multiples at intervals along the entire circumferential direction, as shown in Figures 1 and 2. 【0026】 If the occlusal surface K is defined as the position where the upper and lower teeth meet in the occlusal direction, then in a side view parallel to the occlusal surface K, the inclination angle of the first brush portion 41 with respect to the occlusal surface K is smaller the closer it is to the occlusal surface K and larger the further it is from the occlusal surface K. Specifically, the inclination angles of the first brush portions 41A and 41D, which are closest to the gums and furthest from the occlusal surface K, are larger than the inclination angles of the first brush portions 41B, 41E and 41C and 41F. The inclination angles of the first brush portions 41C and 41F, which are closest to the occlusal surface K, are smaller than the inclination angles of the first brush portions 41A, 41D and 41B and 41E. 【0027】 When the mouthpiece portion 20 is held in the mouth, the mouth tends to be slightly open. Also, the dimensions of the tooth surface in the occlusal direction are often larger than the occlusal direction arrangement pitch at the roots of the first brush portion 41A and the first brush portion 41C, and the occlusal direction arrangement pitch at the roots of the first brush portion 41D and the first brush portion 41F. Therefore, if the inclination angles of the first brush portions 41A-41C and 41D-41F are the same, the tips of the first brush portions 41A-41C and 41D-41F will have difficulty covering the entire tooth surface in the occlusal direction. 【0028】 In this embodiment, the inclination angle increases sequentially from the first brush section 41C to the first brush section 41A, and from the first brush section 41F to the first brush section 41D. Therefore, even when the mouth is slightly open, the first brush sections 41C and 41F can be fitted to the lingual tooth tip side, and the first brush sections 41A and 41D can be fitted to the lingual gum side. 【0029】 The first brush portions 41A and 41B, 41B and 41C, 41D and 41E, and 41E and 41F that are adjacent in the occlusal direction have their circumferential arrangement pitches offset by, for example, half a pitch. That is, when viewed in the direction opposite to the brush surface 31a, the first brush portions 41A, 41B, 41C and 41D, 41E, 41F are arranged in a staggered pattern. By arranging the first brush portions 41A, 41B, 41C and 41D, 41E, 41F in a staggered pattern, the gaps between the first brush portions 41 can be reduced, improving the fit to the tooth surface and cleaning performance. 【0030】 The second brush portion 71 is provided on the second support 61 with vertical spacing between them. The second brush portion 71 is provided on the upper end and lower end of the second support 61, respectively. The second brush portion 71 extends inward in the depth direction from the inner brush surface 61a in the depth direction of the second support 61. When viewed from above, the brush surface 61a has portions that are curved along the circumferential direction in a direction that is convex outward. 【0031】 This embodiment is a toothbrush 1 that uses a second brush section 71 arranged along the dental arch and is intended to be moved manually or electrically. Because the brush surface 61a is curved, the second brush section 71 can be positioned along the buccal side of the dental arch, improving cleaning performance and fit. Furthermore, it is possible to maximize the contact area of ​​the second brush section 71, which contributes to improved vibration efficiency and cleaning power in the case of an electrically operated toothbrush. 【0032】 The second brush section 71 includes second brush sections 71A, 71B, 71C, and 71D, and second brush sections 71E, 71F, 71G, and 71H. The second brush sections 71A, 71B, 71C, and 71D, and the second brush sections 71E, 71F, 71G, and 71H extend inward in the depth direction from the brush surface 61a. The second brush section 71A extends outward from the upper end of the brush surface 61a. The second brush section 71B extends inward from a position lower than the second brush section 71A. The second brush section 71C extends inward from a position lower than the second brush section 71B. The second brush section 71D extends inward from a position lower than the second brush section 71C. 【0033】 The second brush section 71E extends inward from the lower end of the brush surface 61a. The second brush section 71F extends inward from a position above the second brush section 71E. The second brush section 71G extends inward from a position above the second brush section 71F. The second brush section 71H extends inward from a position above the second brush section 71G. The second brush section 71, including the second brush sections 71A, 71B, 71C, 71D and the second brush sections 71E, 71F, 71G, 71H, is provided in multiples with spacing between them throughout the entire circumferential direction, as shown in Figures 1 and 2. 【0034】 In a side view parallel to the occlusal surface K, the inclination angle of the second brush portion 71 is smaller the closer it is to the occlusal surface K and larger the further it is from the occlusal surface K. Specifically, the inclination angles of the second brush portions 71A and 71E, which are closest to the gums and furthest from the occlusal surface K, are larger than the inclination angles of the second brush portions 71B-71D and 71F-71H. The inclination angles of the second brush portions 71C, 71D, 71G, and 71H, which are closer to the occlusal surface K, are smaller than the inclination angles of the second brush portions 71A, 71B and 71E, 71F. For example, the inclination angles of the second brush portions 71C and 71D are the same, and the inclination angles of the second brush portions 71G and 71H are the same. The inclination angle of the second brush section 71D may be smaller than the inclination angle of the second brush section 71C, and the inclination angle of the second brush section 71H may be smaller than the inclination angle of the second brush section 71G. 【0035】 When the mouthpiece portion 20 is held in the mouth, the mouth tends to be slightly open. Also, the dimensions of the tooth surface in the occlusal direction are often larger than the occlusal direction arrangement pitch at the roots of the second brush portion 71A and the second brush portion 71D, and the occlusal direction arrangement pitch at the roots of the second brush portion 71E and the second brush portion 71H. Therefore, if the inclination angles of the second brush portions 71A-71D and 71E-71H are the same, the tips of the second brush portions 71A-71D and 71E-71H will have difficulty covering the entire tooth surface in the occlusal direction. 【0036】 In this embodiment, the inclination angle increases sequentially from the second brush section 71C to the second brush section 71A, and from the second brush section 71G to the second brush section 71E. Therefore, even when the mouth is slightly open, the second brush sections 71C, 71D, 71G, and 71H can be fitted to the lingual tooth tip side, and the second brush sections 71A and 71E can be fitted to the lingual gum side. 【0037】 The second brush sections 71A and 71B, 71B and 71C, 71C and 71D, 71E and 71F, 71F and 71G, and 71G and 71H that are adjacent to each other in the meshing direction have their circumferential arrangement pitches offset by, for example, half a pitch. That is, when viewed in the direction opposite to the brush surface 61a, the second brush sections 71A, 71B, 71C, 71D and 71E, 71F, 71G, and 71H are arranged in a staggered pattern. The arrangement of the second brush sections 71A, 71B, 71C, 71D and 71E, 71F, 71G, 71H in a staggered pattern reduces the gaps between the second brush sections 71, improving the fit to the tooth surface and cleaning performance. 【0038】 The third brush body 80 is positioned between the first brush body 30 and the second brush body 60 in the depth direction. The third brush body 80 has a connecting portion 81 and a third brush portion 91. The connecting portion 81 is positioned between the first brush body 30 and the second brush body 60 in the depth direction and is formed in a U-shape along the circumferential direction. The connecting portion 81 is plate-shaped and perpendicular to the meshing direction. At least a portion of the connecting portion 81 connects the first support 31 and the second support 61 in the depth direction. 【0039】 Figure 5 is a front view of the mouthpiece section 20, excluding the first brush section 41, the second brush section 71, and the third brush section 91. In subsequent drawings, the first brush section 41, the second brush section 71, and the third brush section 91 may also be omitted as appropriate. 【0040】 As shown in Figure 5, the connecting portion 81 of this embodiment has deformation regions S1 located at both ends in the circumferential direction. The first recess 82 is located closer to the first support 31 than to the center in the depth direction of the connecting portion 81. The first recess 82 is linear in shape and extends in the circumferential direction. The first recess 82 opens outward at both ends in the circumferential direction. The first recess 82 penetrates the connecting portion 81 in the occlusal direction. By providing the first recess 82 in the connecting portion 81, the constraint on the first support 31 by the connecting portion 81 is reduced in the deformation region S1, and the first support 31 elastically deforms in the depth direction starting from the circumferential center side (anterior tooth side) of the first recess 82. The first support 31 becomes movable in the depth direction by elastically deforming inward in the depth direction. In other words, by providing the first recess 82 in the connecting portion 81, the first support 31 and the second support 61 can move relative to each other by elastically deforming in the depth direction in the deformation region S1. 【0041】 The connecting portion 81 of this embodiment has second recesses 83 in the deformation regions S2 located at both ends in the circumferential direction. The second recesses 83 are positioned closer to the second support 61 than to the center in the depth direction of the connecting portion 81. The second recesses 83 are linear in shape and extend in the circumferential direction. The second recesses 83 open outward at both ends in the circumferential direction. The second recesses 83 penetrate the connecting portion 81 in the occlusal direction. By providing the second recesses 83 in the connecting portion 81, the constraint on the second support 61 by the connecting portion 81 in the deformation region S2 is reduced, and the second support 61 elastically deforms in the depth direction starting from the circumferential center side (anterior tooth side) of the second recesses 83. The second support 61 becomes movable in the depth direction by elastically deforming in the depth direction. In other words, by providing the second recesses 83 in the connecting portion 81, the first support 31 and the second support 61 can elastically deform and move relative to each other in the deformation region S2. In the following explanation, the first recess 82 and the second recess 83 may be collectively referred to as recess 84. 【0042】 In this embodiment, the connecting portion 81 is connected to the first support 31 in the depth direction in the region excluding the deformation regions S1 located at both ends of the first support 31 in the circumferential direction. The connecting portion 81 is connected to the second support 61 in the depth direction in the region excluding the deformation regions S2 located at both ends of the second support 61 in the circumferential direction. In other words, the connecting portion 81 connects the first support 31 and the second support 61 in the depth direction in the region excluding the deformation regions S1 and S2 located at both ends of the circumferential direction. The connecting portion 81 connects the first support 31 and the second support 61 in the region excluding the deformation regions S1 and S2, and at the central position in the meshing direction. 【0043】 The connecting portion 81 may be a molded body integrally molded with the first support 31 and the second support 61, or it may be resin-molded independently and then connected to the first support 31 and the second support 61, or it may be integrally molded with either the first support 31 or the second support 61 and then connected to the other of the first support 31 or the second support 61. 【0044】 As shown in Figures 2 and 4, the third brush portion 91 extends from the connecting portion 81 to both sides in the occlusal direction. The third brush portion 91 has a mountain-shaped bristle length profile with a peak at the midpoint in the depth direction. The mountain-shaped bristle length profile of the third brush portion 91 provides a profile that fits the occlusal surfaces of teeth, improving cleaning power. The third brush portion 91 is preferably positioned, for example, opposite the molars. Because the third brush portion 91 is positioned opposite the molars and protrudes upward and downward, it can effectively clean the occlusal surfaces of the molars, which are difficult for the first brush portion 41 and the second brush portion 71 to reach. 【0045】 Figures 6 and 7 are enlarged views showing the operation of the mouthpiece section 20. In Figures 6 and 7, a enlarged view of the second support 61 located on the left side is shown. In the toothbrush 1 with the above configuration, since the first support 31 and the second support 61 are relatively movable in the depth direction, the molars can be brushed by moving the mouthpiece 20 from side to side in the circumferential direction along the teeth while it is held in the mouth. When the mouthpiece 20 is moved from side to side, for example, as shown by the white arrow in Figure 6, the second end 61b in the circumferential direction of the second support 61 interferes with (collides with) the molars T from the front teeth. 【0046】 In the deformation region S2, the second support 61 is elastically deformable in the depth direction. Therefore, when the second end portion 61b interferes with the molar T from the anterior tooth side, the pressure transmitted via the second brush portion 71 causes the support to elastically deform outward in the depth direction, starting from a first inflection point P1 that occurs on the second side surface 61c on the outer side in the depth direction, as shown in Figure 7. The first inflection point P1 occurs near the circumferential central end of the second recess 83. Examples of the elastic deformation of the second support 61 outward in the depth direction starting from the first inflection point P1 include deformation to a shape with a larger radius of curvature (Pattern A), deformation in which the support bends outward in the depth direction with the first inflection point P1 as the center while maintaining the same radius of curvature (Pattern B), or deformation to a shape with a radius of curvature in which the center of curvature is located on the outer side in the depth direction opposite to the center of curvature of the second support 61 which is located circumferentially closer to the center than the first inflection point P1 (Pattern C). Of these deformations, elastic deformation in pattern C is preferred. This allows for smooth brushing without interference or obstruction from the molars T when the mouthpiece 20 is moved from side to side. 【0047】 Furthermore, when the second support 61 interferes with the molars T, it elastically deforms and moves outward in the depth direction, which prevents the second brush portion 71 from bending excessively, allowing the bristles to be used to thoroughly clean the molars T. 【0048】 The second support 61, which is elastically deformed due to interference with the molar T, presses against the molar T from the outside in the depth direction via the second brush portion 71 with its elastic restoring force. As a result, the second brush body 60 can thoroughly clean the molar T from the outside in the depth direction with the second brush portion 71. Furthermore, when the second support 61 is separated from the molar T, it returns to its position (posture) before it was elastically deformed due to interference with the anterior teeth, due to its elastic restoring force. 【0049】 Therefore, even if the molars T are in a position and shape that interferes with the second support 61, when the mouthpiece portion 20 is moved from side to side, the second support 61 alternately repeats a position in which it does not interfere with the molars T, depending on the relative position of the molars T in the circumferential direction, and a position in which it presses against the molars T from the outside in the depth direction via the second brush portion 71 with elastic restoring force. As a result, the second brush body 60 can perform a smooth brushing motion while intermittently and thoroughly cleaning the molars T from the outside in the depth direction with the second brush portion 71. 【0050】 Figures 8 and 9 are enlarged partial views showing the operation of the mouthpiece section 20. In Figures 8 and 9, an enlarged partial view of the first support 31 located on the right side is shown. In the toothbrush 1 with the above configuration, when the mouthpiece portion 20 is moved from side to side, for example, as shown by the white arrow in Figure 8, the first end portion 31b in the circumferential direction of the first support 31 interferes with (collides with) the molars T from the anterior side. 【0051】 In the deformation region S1, the first support 31 is elastically deformable in the depth direction. Therefore, when the first end portion 31b interferes with the molar T from the anterior tooth side, the pressure transmitted via the first brush portion 41 causes the support to elastically deform inward in the depth direction, starting from a second inflection point P2 that occurs on the first side surface 31c on the inner side in the depth direction, as shown in Figure 9. The second inflection point P2 occurs near the circumferential central end of the first recess 82. The first support 31, which has elastically deformed inward in the depth direction starting from the second inflection point P2, has its center of curvature on the same side as the curve of the first support 31 that is circumferentially closer to the center of the second inflection point P2. Preferably, it deforms into a shape with a smaller radius of curvature. This allows for smooth brushing without interference or obstruction from the molars T when the mouthpiece 20 is moved from side to side. 【0052】 Furthermore, when the first support 31 interferes with the molars T, it elastically deforms and moves inward in the depth direction, which prevents the first brush portion 41 from bending excessively, allowing the bristles to be used to thoroughly clean the molars T. 【0053】 The first support 31, which is elastically deformed by interference with the molar T, presses against the molar T from the inside in the depth direction via the first brush portion 41 with its elastic restoring force. As a result, the first brush body 30 can thoroughly clean the molar T from the inside in the depth direction with the first brush portion 41. Furthermore, when the first support 31 is separated from the molar T, it returns to its position (posture) before it was elastically deformed by interference with the anterior teeth due to its elastic restoring force. 【0054】 Therefore, even if the molars T are in a position and shape that interferes with the first support 31, when the mouthpiece portion 20 is moved from side to side, the first support 31 alternately repeats a position in which it does not interfere with the molars T, depending on the relative position of the molars T in the circumferential direction, and a position in which it presses against the molars T from the inside in the depth direction via the first brush portion 41 with elastic restoring force. As a result, the first brush body 30 can perform a smooth brushing motion while the first brush portion 41 intermittently and thoroughly cleans the molars T from the inside in the depth direction. 【0055】 The first inflection point P1 that occurs on the second side surface 61c of the second support 61 is located in a range L21 from the second end 61b to 50% of the second circumference L2, as shown in Figure 7, with respect to the second circumference L2 from the center of the second support 61 in the circumferential direction to the second end 61b, as shown in Figure 5. If the first inflection point P1 occurs outside the range L21, which is up to 50% of the second circumference L2, the second side surface 61c will bend significantly in the occlusal direction and depth direction, making it difficult for the second brush portion 71 to contact the tooth and reducing cleaning power. The first inflection point P1 is located in the range L21, which is up to 50% of the second circumference L2, allowing the bristles of the second brush section 71 to thoroughly clean the molars T. 【0056】 Figure 10A shows a schematic configuration of the measuring device 100 for measuring the mouthpiece portion 20. The measuring device 100 includes a support device 110, a height measuring device 120 such as a height gauge, and an imaging device 130. The support device 110 has a support member 111 that extends horizontally. The support member 111 supports the mouthpiece portion 20. The mouthpiece portion 20 has a horizontal depth direction at its circumferential center, and is supported and fixed by the support member 111 in a position where the first support member 31 and the second support member 61 are aligned vertically. The mouthpiece portion 20 supported by the support member 111 has a constant load applied to its outer side in the depth direction by suspending a 200g weight 112 from the second end 61b (for example, in the procedure, the weight is suspended 1 mm away from the second end 61b towards the circumferential center). 【0057】 When measuring the position of the first inflection point P1 using the measuring device 100, the second support 61 around the second end portion 61b is imaged by the imaging device 130 before applying a constant load with the weight 112 at room temperature (for example, 23°C) and again 10 seconds after applying the constant load. The position of the first inflection point P1 can then be determined by measuring and comparing the captured images using an optical microscope. 【0058】 The second inflection point P2 that occurs on the first side surface 31c of the first support 31 is located in a range L11 from the first end 31b to 50% of the first circumference L1, as shown in Figure 7, with respect to the first circumference L1 from the center of the first support 31 in the circumferential direction to the first end 31b, as shown in Figure 5. The second inflection point P2 is located in the range L11, which is up to 50% of the first circumference L1, allowing the bristles of the first brush part 41 to be used to thoroughly clean the molars T. 【0059】 When measuring the position of the second inflection point P2 using the measuring device 100, as shown in Figure 10B, a constant load is applied by, for example, suspending a 200g weight 113 from the first end portion 31b at room temperature (for example, 23°C) (for procedural reasons, for example, suspending the weight 1 mm away from the first end portion 31b towards the circumferential center). The first support 31 around the first end portion 31b is then imaged by the imaging device 130 before the constant load is applied by the weight 113 and again 10 seconds after the constant load is applied. The position of the second inflection point P2 can then be determined by measuring and comparing the captured images using an optical microscope. 【0060】 Figure 11 is a cross-sectional view of AA in Figure 5. As shown by the dashed line in Figure 11, the recess 84 allows the third circumferential end portion 81a of the connecting portion 81 to move independently of the first support 31 and the second support 61 by elastically deforming in the meshing direction, starting from a third inflection point P3, when a predetermined load (for example, an upper load) is applied in the meshing direction. The third inflection point P3 occurs near the circumferential central end portion of the recess 84. When a predetermined load is applied to the third end portion 81a in the occlusal direction, it elastically deforms in the occlusal direction independently of the first support 31 and the second support 61. As a result, when the mouthpiece 20 is moved from side to side, the connecting portion 81 can flex in the occlusal direction relative to the occlusal surface in accordance with the irregularities of the occlusal surface of the teeth. Therefore, interference of the connecting portion 81 with the occlusal surface of the molars can be suppressed, and smooth brushing can be performed. Furthermore, the bristles of the third brush section 91 can be used to polish the occlusal surface of the teeth, allowing for thorough cleaning of the molars T. 【0061】 As shown in Figure 5, the third inflection point P3 that occurs in the connecting portion 81 is located in a range L31 from the third end 81a to 50% of the third circumference L3, as shown in Figure 11, with respect to the third circumference L3 from the center of the circumferential direction of the connecting portion 81 to the third end 81a. If the third inflection point P3 occurs outside the range L31 up to 50% of the third circumference L3, the connecting portion 81 will bend significantly in the occlusal direction and depth direction, making it difficult for the third brush portion 91 to contact the teeth, thus reducing the cleaning power on the molar side. The third inflection point P3 is located in the range L31, which is up to 50% of the third circumference L3, allowing the bristles of the third brush section 91 to thoroughly clean the molars T. 【0062】 When measuring the position of the third inflection point P3 using the measuring device 100, first, the mouthpiece portion 20 is supported by the support 111 in the measuring device 100 so that the first support 31 and the second support 61 are aligned horizontally and the connecting portion 81 is horizontal. Then, as shown by the dashed line in Figure 11, a constant load is applied by suspending, for example, a 200g weight 114 from the third end portion 81a (for procedural purposes, for example, the weight is suspended 1 mm away from the third end portion 81a towards the circumferential center). After that, the connecting portion 81 around the third end portion 81a is imaged by the imaging device 130 before the constant load is applied by the weight 114 and 10 seconds after the constant load is applied. The position of the third inflection point P3 can then be determined by measuring and comparing the captured images using an optical microscope. 【0063】 Figure 12 is a magnified view illustrating the deformation characteristics of the mouthpiece portion 20. As shown in Figure 12, when a predetermined load G is applied to the second end portion 61b of the second support 61 outward in the depth direction, the displacement of the second end portion 61b is defined as H1. A position P4 is determined by moving from the first inflection point P1 to the center in the circumferential direction by the circumference from the first inflection point P1 to the second end portion 61b as measured as described above. When the predetermined load G is applied to the determined position P4 outward in the depth direction, the displacement of position P4 is defined as H2. The displacement amounts H1 and H2 satisfy the relationship H1 > H2. 【0064】 When the displacement amounts H1 and H2 are H1 ≤ H2, the center of the circumferential direction flexes significantly when the mouthpiece 20 is moved from side to side, and the left-right brushing motion is absorbed only by the center of the circumferential direction. In this case, the mouthpiece 20 does not move from side to side all the way to the end on the molar side, so the force with which the second brush portion 71 scrapes away dirt from the molars, i.e., the cleaning force on the molar side, is reduced. Therefore, when the displacement amounts H1 and H2 satisfy the relationship H1 > H2, the mouthpiece portion 20 can be moved from side to side, allowing for smooth brushing including the molars, and the second brush portion 71 can thoroughly clean the molars T. 【0065】 As a method for measuring the displacement H1, the measuring device 100 shown in Figure 10A is used, and the height of the second end 61b of the second support 61 is measured by the height measuring device 120 before applying a predetermined load G to the second end 61b of the second support 61 at room temperature. Then, a constant load is applied to the outside in the depth direction by suspending a 200g weight 112 from the second end 61b (for example, suspending the weight 1 mm away from the center in the circumferential direction from the second end 61b), and the height of the second end 61b is measured by the height measuring device 120 after 10 seconds. By determining the height of the second end 61b before applying the constant load with the weight 112 and 10 seconds after applying the constant load, the displacement H1 of the second end 61b can be measured from the difference in height of the second end 61b. 【0066】 As a method for measuring the displacement H2, the measuring device 100 shown in Figure 10C is used, and the height of position P4 is measured by the height measuring device 120 before applying a predetermined load G to the second end 61b of the second support 61 at room temperature (for example, 23°C). Then, a constant load is applied to the outside in the depth direction by suspending a 200g weight 115 at position P4, and the height of position P4 is measured by the height measuring device 120 after 10 seconds. By determining the height of position P4 before applying the constant load with the weight 115 and 10 seconds after applying the constant load, the displacement H2 of position P4 can be measured from the difference between the heights of position P4. 【0067】 Furthermore, when a predetermined load G1 (not shown) is applied to the second end portion 61b of the second support 61 in the outward direction in the depth direction, the displacement of the second end portion 61b is defined as H01, and the displacement of position P4 is defined as H02. The displacement amounts H01 and H02 satisfy the relationship H01 > H02. If the displacement amounts H01 and H02 satisfy the condition H01 ≤ H02, then, as described above, the center of the circumferential direction will bend significantly when the mouthpiece 20 is moved from side to side, and the left-right brushing motion will be absorbed only by the center of the circumferential direction. In this case, the mouthpiece 20 will not move from side to side all the way to the end on the molar side, so the force with which the second brush portion 71 scrapes away dirt from the molars, i.e., the cleaning force on the molar side, will decrease. Therefore, by satisfying the relationship H01 > H02 between the displacement amounts H01 and H02, when the mouthpiece portion 20 is moved from side to side, a smooth brushing motion including the molars can be performed, and the molars T can be thoroughly cleaned by the second brush portion 71. Note that the predetermined load G1 may be the same as or different from the predetermined load G described above. 【0068】 The method for measuring displacement H01 is the same as the method for measuring displacement H1. As a method for measuring the displacement H02, the height of position P4, which was determined as described above, is measured using the height measuring device 120 before applying a constant load to the outside in the depth direction. Then, at room temperature, a constant load is applied to the outside in the depth direction by suspending a 200g weight 112 from the second end 61b (for example, suspending the weight 1 mm away from the second end 61b towards the center in the circumferential direction) as shown in Figure 10A, and the height of position P4 is measured using the height measuring device 120 after 10 seconds. By determining the height of position P4 before applying a constant load with weight 112 and 10 seconds after applying the constant load, the displacement H2 of position P4 can be measured from the difference in heights of position P4. 【0069】 Figure 13 is a magnified view illustrating the deformation characteristics of the mouthpiece portion 20. As shown in Figure 13, when a predetermined load G2 is applied inward in the depth direction to the first end portion 31b of the first support 31, the first side surface 31c from the second inflection point P2 to the first end portion 31b elastically deforms into an arc shape in which the center of curvature C2 is located inward in the depth direction compared to the first side surface 31c. More specifically, the first side surface 31c of the first support 31, which has elastically deformed inward in the depth direction starting from the second inflection point P2, has the same center of curvature as the curve of the first support 31 on the circumferential side of the second inflection point P2. Preferably, it deforms into a shape in which the radius of curvature becomes smaller. The first support 31 in the deformation region S1, where the first side surface 31c is arc-shaped, does not move in conjunction with the first support 31 on the circumferentially central side of the deformation region S1. 【0070】 When the mouthpiece portion 20 is moved from side to side and the first brush portion 41 reaches the molars, the curvature of the teeth and the curvature of the mouthpiece 20 are different, causing the inner surface of the molars to come into contact with the first support 31 and applying a load to the inside in the depth direction. This load causes the first support 31 to elastically deform so that the first side surface 31c becomes an arc shape, allowing for smooth brushing including the molars when the mouthpiece portion 20 is moved from side to side, and enabling the molars T to be thoroughly cleaned by the second brush portion 71. 【0071】 As shown in Figure 10B, a predetermined load G2 can be applied to the first end portion 31b inward in the depth direction by, for example, suspending a 200g weight 113 from the first end portion 31b at room temperature (technically, for example, suspending the weight 1mm away from the first end portion 31b towards the circumferential center). 【0072】 In this embodiment, the first support 31 and the second support 61 can, for example, be configured with different hardnesses as material properties. It is preferable that the hardness of the first support 31 is greater than that of the second support 61. It is more preferable that the first support 31 is made of a soft resin with a Shore A hardness of 50 or higher and a Shore D hardness of 75 or lower. It is more preferable that the second support 61 is made of a soft resin with a Shore A hardness of 40 or higher and a Shore D hardness of 70 or lower. "Shore A hardness" refers to the Durometer A hardness of plastics measured according to JIS K 7215 or JIS K 6253. "Shore D hardness" refers to the hardness of Durometer Type D as defined in JIS K 6253. 【0073】 On the outer side of the dental arch in the depth direction, the gap between the curvature of the mouthpiece 20 and the curvature of the dental arch is larger on the outer side when the mouthpiece 20 is moved from side to side, and there is also 3D obstruction due to the buccal mucosa. Therefore, by making the second support 61 located on the outer side softer than the first support 31, and making it easier to move relative to the first support 31 in the depth direction, the second support 61 can be deformed, thereby improving the conformability of the second brush portion 71 to the dental arch. On the other hand, on the inner side of the dental arch in the depth direction, the change in curvature is small and there is less 3D obstruction. Therefore, by making the first support 31 located on the inner side harder than the second support 61, the conformability of the first brush portion 41 of the first support 31 to the dental arch can be improved. 【0074】 Furthermore, depending on the presence or absence of the above-mentioned steric obstruction and the amount of change in curvature, there will also be a difference in the resistance associated with the circumferential movement of the first support 31 and the second support 61. In this embodiment, by making the second support 61, which is located on the outside and has greater resistance associated with movement, softer than the first support 31, the second support 61 can easily move relative to the first support 31 in the circumferential direction and deform, thereby improving the conformability of the second brush portion 71 to the dental arch. 【0075】 Furthermore, it is more preferable that the hardness of the first brush portion 41 and the second brush portion 71 is within the above range. If the hardness of the soft resin is below the above lower limit, insufficient scraping force and, if the mouthpiece portion 20 is electric, insufficient vibration transmission will occur, resulting in a decrease in cleaning function. If the hardness of the soft resin exceeds the above upper limit, the first brush section 41 and the second brush section 71 become less flexible, reducing their fit and impairing their cleaning function. 【0076】 Various elastomers can be used as the soft resin constituting the first material that makes up the first brush body 30 and the second brush body 60, but polyurethane and silicone are examples. Polyurethane tends to have higher tensile strength and mechanical abrasion resistance compared to other elastomers such as styrene-based and polyester-based materials. Therefore, using polyurethane in soft resins makes it less prone to breakage even when thin-walled, enabling increased mechanical strength and long-term use. Silicone, in particular, possesses high heat and chemical resistance, minimizing quality degradation during boiling sterilization and in the presence of toothpaste. 【0077】 As described above, in the mouthpiece portion 20 of this embodiment, the first support 31 and the second support 61 are elastically deformed in the depth direction in the deformation regions S1 and S2 located at both ends in the circumferential direction, allowing for relative movement. Therefore, when the mouthpiece portion 20 is moved from side to side, smooth brushing is possible, including the molars, and the molars T can be thoroughly cleaned by the second brush portion 71. 【0078】 [Second embodiment of the mouthpiece portion 20] Next, a second embodiment of the mouthpiece portion 20 will be described with reference to Figures 14 and 15. In these figures, elements identical to those in the first embodiment shown in Figures 1 to 13 are denoted by the same reference numerals, and their descriptions are omitted. 【0079】 Figure 14 is a partially enlarged view of the mouthpiece portion 20 according to the second embodiment. As shown in Figure 14, in this embodiment, the outer ends of the first recess 82 and the second recess 83 are positioned circumferentially towards the center of the third end 81a of the connecting portion 81. In other words, the first recess 82 and the second recess 83 in this embodiment do not open outward at both ends in the circumferential direction. 【0080】 Therefore, as shown in Figure 8, when the first support 31 interferes with the molar T, the pressure transmitted through the first brush portion 41 causes the connecting portion 81, which is located circumferentially inward of the first recess 82 and connects to the first support 31, to expand and contract in the depth direction, as shown in Figure 14. As the connecting portion 81 connected to the first support 31 expands and contracts elastically in the depth direction, the first support 31 becomes elastically deformable in the depth direction. 【0081】 Similarly, as shown in Figure 6, when the second support 61 interferes with the molar T, the pressure transmitted through the second brush portion 71 causes the connecting portion 81, which is located circumferentially outside the second recess 83 and connects to the second support 61, to expand and contract in the depth direction, as shown in Figure 14. As the connecting portion 81 connected to the second support 61 expands and contracts elastically in the depth direction, the second support 61 becomes elastically deformable in the depth direction. The other configurations are the same as those of the first embodiment described above. 【0082】 In the mouthpiece portion 20 of this embodiment, in addition to obtaining the same functions and effects as in the first embodiment, the first recess 82 and the second recess 83 do not open in the circumferential direction, but are closed when viewed in the biting direction. Therefore, compared to a configuration in which the first recess 82 and the second recess 83 open in the circumferential direction, it is possible to alleviate stress concentration when the first support 31 and the second support 61 undergo elastic deformation, thereby improving durability. 【0083】 In addition to the configuration shown in Figure 14 in which the first recess 82 and the second recess 83 extend linearly (for example, in a straight line) along the circumferential direction, a configuration in which multiple recesses are arranged at intervals along the circumferential direction, as shown in Figure 15, is also possible, in which case the first recess 82 and the second recess 83 do not open outward at both ends in the circumferential direction. Even with this configuration, the same effects and advantages as the configuration in which the first recess 82 and the second recess 83 extend linearly along the circumferential direction can be obtained. 【0084】 Furthermore, the recess 84 does not necessarily have to penetrate the connecting portion 81. Figure 16 is a cross-sectional view of Figure 14. As shown in Figure 16, the recess 84 may be, for example, a depression with a bottom on the lower side. A thin wall thickness at the bottom of the recess 84 makes the connecting portion 81 more susceptible to expansion and contraction in the depth direction in the deformation regions S1 and S2. From a molding standpoint, the wall thickness at the bottom is preferably 0.3 mm or more. 【0085】 When the recess 84 penetrates the connecting portion 81, there is a possibility that molding defects called burrs may occur on the outer surface of the recess 84 during injection molding of the connecting portion 81 (mouthpiece portion 20). However, having a bottom in the recess 84 can suppress the above-mentioned molding defects. 【0086】 [Third embodiment of the mouthpiece portion 20] Next, a third embodiment of the mouthpiece portion 20 will be described with reference to Figures 17 to 18. In these figures, elements identical to those in the first embodiment shown in Figures 1 to 13 are denoted by the same reference numerals, and their descriptions are omitted. 【0087】 As shown in Figure 17, in this embodiment, the connecting portion 81 does not have a recess 84. The connecting portion 81 in this embodiment has a first soft portion 81B formed of the first soft resin material described above, and a second soft portion 81C formed of a second material that is softer and has lower hardness than the first material. The second soft portion 81C is formed in a specific range on the circumferential side from the third end portion 81a towards the center. In this embodiment, the region in the circumferential direction where the second soft portion 81C is located is defined as the deformation region S3. Examples of the second material include materials with lower hardness than the first material, such as polyurethane, silicone, various elastomers, and butadiene rubber systems. 【0088】 In the mouthpiece portion 20 with the above configuration, when the first support 31 interferes with the molars T, or when the second support 61 interferes with the molars T, the second soft portion 81C, which is made of a second material that is softer and less hard than the first material constituting the first soft portion 81B, expands and contracts elastically in the depth direction due to the pressure transmitted through the first brush portion 41 or the second brush portion 71, thereby allowing the first support 31 or the second support 61 to be elastically deformed in the depth direction. Therefore, the mouthpiece portion 20 of this embodiment provides the same functions and effects as the first embodiment described above. 【0089】 In the third embodiment, in addition to the configuration in which the connecting portion 81 is formed of a second material that is softer and less hard than the first material, as shown in Figure 18, the first soft portion 30B, which is made of the first soft resin material described above, is positioned circumferentially towards the center of the deformation region S3, and the second soft portion 30C, which is made of the second material, is positioned in the deformation region S3. 【0090】 Similarly, in the second brush body 60, which includes the second support 61 and the second brush portion 71, the first soft portion 60B, formed of the first soft resin material described above, may be positioned circumferentially towards the center of the deformation region S3, while the second soft portion 60C, formed of the second material, may be positioned in the deformation region S3. Even with the configurations shown in Figure 18, the same effects and benefits as those of the first embodiment described above can be obtained. 【0091】 Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. The shapes and combinations of the constituent members shown in the above examples are merely examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention. 【0092】 For example, in the first embodiment described above, a configuration in which a first recess 82 is provided in the deformation region S1 and a second recess 83 is provided in the deformation region S2 was illustrated, but the configuration is not limited to this, and the first recess 82 The configuration may also consist of only one of the two recesses 83. 【0093】 For example, consider a configuration in which the first recess 82 is not provided, and only the second recess 83 is provided. In this case, when the first support 31 interferes with the molar T, the first support 31 does not elastically deform, but the inward pressure in the depth direction transmitted via the first brush portion 41 is transmitted to the second support 61 via the connecting portion 81. The second support 61 presses against the molar T via the second brush portion 71 due to the inward pressure in the depth direction, and elastically deforms outward in the depth direction due to the reaction force. As the second support 61 elastically deforms outward in the depth direction, the first support 31 becomes relatively movable inward in the depth direction relative to the second support 61. 【0094】 Furthermore, although the above embodiment illustrates a configuration in which the first brush portion 41 and the second brush portion 71 are provided over the entire circumferential direction with respect to the first support 31 and the second support 61, the configuration is not limited to this, and for example, the first brush portion 41 and the second brush portion 71 may be arranged intermittently in the θ direction. Furthermore, the mouthpiece portion 20 may be provided not only over the entire circumference, but also, for example, in only one of the left or right regions. 【0095】 Furthermore, while the above embodiment illustrates a configuration in which the first brush portion 41, the second brush portion 71, and the third brush portion 91 are provided in each of the deformation regions S1, S2, and S3, the configuration is not limited to this. Any configuration in which at least one of the first brush portion 41, the second brush portion 71, and the third brush portion 91 is provided in each of the deformation regions S1, S2, and S3 is acceptable. 【0096】 Furthermore, the first brush portion 41 and the second brush portion 71 described in the above embodiment may be filaments integrally molded with the first support 31 and the second support 61, respectively, or they may be bundles of bristles provided on the first support 31 and the second support 61, respectively. 【0097】 Furthermore, although the above embodiment illustrates a configuration in which the toothbrush 1 has an electric drive unit in the gripping portion 10, it is not limited to this configuration. The toothbrush 1 may also be configured in which the gripping portion 10 does not have an electric drive unit, and the user manually applies vibration to the mouthpiece portion 20 via the gripping portion 10. [Explanation of Symbols] 【0098】 1...Toothbrush, 10...Holding part, 20...Mouthpiece part (connecting body), 30...First brush body, 31...First support, 41...First brush part, 60...Second brush body, 61...Second support, 61b...Second end, 71...Second brush part, 80...Third brush body, 81...Connecting part, 81a...Third end, 84...Recess, 91...Third brush part, C2...Center of curvature, L1...First circumference, L2...Second circumference, L11, L21, L31...Range, P1...First inflection point, P2...Second inflection point, P3...Third inflection point, S1, S2, S3...Deformation region

Claims

[Claim 1] The gripping part, A connecting body is connected to one side of the gripping portion in the depth direction perpendicular to the meshing direction, It has, The aforementioned connecting body, A first brush body located on one side in the depth direction of the gripping portion, A second brush body is positioned between the gripping portion and the first brush body in the depth direction, and is positioned away from the first brush body. A third brush body is positioned between the first brush body and the second brush body in the depth direction, It has, The first brush body is A first support is formed in a U-shape along the circumferential direction centered on the axis extending in the meshing direction, A first brush portion extending from the first support to the other side in the depth direction, It has, The second brush body is A second support formed in a U-shape along the circumferential direction, A second brush portion extending from the second support to one side in the depth direction, It has, The third brush body is A U-shaped structure formed along the circumferential direction, with at least a portion of which is a connecting portion connecting the first support and the second support in the depth direction, A third brush portion extending from the connecting portion to both sides in the meshing direction, It has, The first support and the second support are elastically deformable in the depth direction in the deformation regions located at both ends in the circumferential direction, and are able to move relative to each other. A toothbrush in which at least one of the first brush portion, the second brush portion, and the third brush portion is provided in the deformation region. [Claim 2] The connecting portion has a recess in the deformation region that is located closer to at least one of the first support and the second support than to the center in the depth direction. The toothbrush according to claim 1. [Claim 3] The recess opens outward at both ends in the circumferential direction. The toothbrush according to claim 2. [Claim 4] The second support in the deformation region is elastically deformable and movable in the depth direction. The second side surface of the second support on the other side in the depth direction has a first inflection point that occurs with elastic deformation in the depth direction, The first inflection point is located in the range from the second end to 50% of the second circumference, with respect to the second circumference length from the center of the second support in the circumferential direction to the second end in the circumferential direction. The toothbrush according to any one of claims 1 to 3. [Claim 5] When a predetermined load is applied to the second end of the second support on the other side in the depth direction, Let H01 be the displacement of the second end on the second side surface. If H02 is the displacement amount at a position moved from the first inflection point toward the center in the circumferential direction by the circumference from the first inflection point to the second end, H01 > H02 Satisfying the relationship, The toothbrush according to claim 4. [Claim 6] The first support in the deformation region is elastically deformable and movable in the depth direction. The first side surface of the first support on one side in the depth direction has a second inflection point that occurs with elastic deformation in the depth direction, When a predetermined load is applied to the first end in the circumferential direction of the first support on one side in the depth direction, the first side surface from the second inflection point to the first end has an arc shape in which the center of curvature is located on one side in the depth direction relative to the first side surface. The toothbrush according to any one of claims 1 to 3. [Claim 7] The third end portion in the circumferential direction of the connecting portion is elastically deformable and movable in the meshing direction independently of the first support and the second support when a predetermined load is applied in the meshing direction. The toothbrush according to any one of claims 1 to 3.

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