Toothbrush

Abstract

The present application provides a toothbrush which is smooth in brushing action and can sufficiently clean the molar teeth. The connecting body has a first brush body, a second brush body which is disposed between the holding portion and the first brush body and is separately disposed relative to the first brush body, and a third brush body which is disposed between the first brush body and the second brush body. The first brush body has a first support body which is formed in a U shape along the circumferential direction and a first brush portion which extends from the first support body. The second brush body has a second support body which is formed in a U shape and a second brush portion which extends from the second support body. The third brush body has a connecting portion which is formed in a U shape and at least a part of which connects the first support body and the second support body in the depth direction, and a third brush portion which extends from the connecting portion. The first support body and the second support body can be elastically deformed in the depth direction and relatively moved in a deformation region which is located at both end sides in the circumferential direction. In the deformation region, at least one of the first brush portion, the second brush portion and the third brush portion is provided.

Description

Technical Field

[0001] This invention relates to a toothbrush. Background Technology

[0002] As a toothbrush that cleans the entire row of teeth at once, Patent Document 1 discloses a toothbrush that is electrically driven in the form of a dental arch. The electric toothbrush disclosed in Patent Document 1 includes: a dental arch that is disposed on a support body in such a way that it engages with substantially all the teeth of at least one of the user's upper and lower jaws simultaneously as a cleaning element of the brush head; and an electric drive unit that is detachably fixed to the dental arch and has at least one vibrating element as a handle for vibrating motion.

[0003] Prior art literature Patent documents Patent Document 1: Japanese Patent Publication No. 2019-520919 Summary of the Invention The problem that the invention aims to solve The braces have brush sections on their support structure. By moving the brush from side to side while biting down on the braces, the molars can be brushed. However, because the curvature of the braces' support structure differs from the curvature of the tooth row, the support structure sometimes collides with the molars, hindering the brushing action. In this case, the molars cannot be thoroughly cleaned.

[0004] In addition, when the support is pressed in forcefully to brush the molars, the brush head is bent too much, making it impossible to use the tip of the brush, which still results in the molars not being cleaned thoroughly.

[0005] The present invention was made with the above considerations in mind, and its purpose is to provide a toothbrush that provides a smooth brushing motion and can thoroughly clean the molars.

[0006] Technical solutions for solving technical problems The present invention has the following aspects. [1] A toothbrush having: Controlling Department; and A connecting body, which is connected to the gripping part on one side in the depth direction orthogonal to the meshing direction. The connector has: The first brush body is located on the side further in the depth direction than the holding part; A second brush body, located between the holding portion and the first brush body in the depth direction, and disposed separately relative to the first brush body; and A third brush body is disposed between the first brush body and the second brush body in the depth direction. The first brush body has: The first support body is formed in a U-shape circumferentially along an axis extending in the meshing direction; and The first brush portion extends from the first support body to the other side in the depth direction. The second brush body has: A second support body, which is formed in a U-shape along the circumferential direction; and The second brush portion extends from the second support body to one side in the depth direction. The third brush body has: A connecting portion, which is U-shaped along the circumferential direction, and at least a portion thereof connects the first support body and the second support body in the depth direction; and The third brush portion extends from the connecting portion to both sides in the meshing direction. The first support and the second support are capable of elastically deforming and moving relative to each other in the depth direction at the deformation regions located at both ends in the circumferential direction. In the deformed region, at least one of the first brush portion, the second brush portion, and the third brush portion is provided. [2] According to the toothbrush described in [1], the connecting portion has a recess in the deformed area, the recess being disposed on a side of the connecting portion closer to at least one of the first support and the second support than the center in the depth direction. [3] According to the toothbrush described in [2], the recess opens outward at both ends in the circumferential direction. [4] According to any one of [1] to [3], the second support body of the deformable region is capable of elastically deforming and moving in the depth direction. The second side surface of the second support body on the other side of the depth direction has a first inflection point generated by elastic deformation accompanying the depth direction. The first inflection point is located within 50% of the second circumference from the second end to the second circumference relative to the second circumference of the second support. [5] According to the toothbrush described in [4], when a given load is applied to the second end of the second support body on the other side of the depth direction, if the displacement of the second end in the second side is set as H01, and the displacement of the position of the circumference from the first inflection point to the central side of the circumference is set as H02, then the displacement of the second end in the second side is set as H02. Then the relationship H01 > H02 is satisfied. [6] According to any one of [1] to [5], the first support body of the deformable region is capable of elastically deforming and moving in the depth direction. The first side surface of the first support body on one side of the depth direction has a second inflection point generated by elastic deformation in the depth direction. When a given load is applied to the first end of the first support in the circumferential direction toward one side of the depth direction, the first side from the second inflection point to the first end is an arc shape with the center of curvature located on the side of the depth direction further away than the first side. [7] According to any one of [1] to [6], the third end of the circumferential direction of the connecting portion is able to move independently of the first support and the second support in the meshing direction when a given load is applied in the meshing direction.

[0014] Invention Effects In this invention, a toothbrush that can thoroughly clean molars is provided. Attached Figure Description

[0015] Figure 1 This is a front view of the toothbrush 1 of the present invention.

[0016] Figure 2 This is a perspective view of the appearance of the braces part 20 in the first embodiment.

[0017] Figure 3 yes Figure 2 BB section view in the middle.

[0018] Figure 4 yes Figure 1 CC section view in the image.

[0019] Figure 5 This is a front view of the first brush body 30, the second brush body 60, and the third brush body 80 after removing the first brush part 41, the second brush part 71, and the connection part with the holding part 10.

[0020] Figure 6 This is a magnified view showing the movement of the braces section 20.

[0021] Figure 7 This is a magnified view showing the movement of the braces section 20.

[0022] Figure 8 This is a magnified view showing the movement of the braces section 20.

[0023] Figure 9 This is a magnified view showing the movement of the braces section 20.

[0024] Figure 10A This is a diagram showing the schematic structure of the measuring device used to measure the brace part 20.

[0025] Figure 10B This is a diagram showing the schematic structure of the measuring device used to measure the brace part 20.

[0026] Figure 10C This is a diagram showing the schematic structure of the measuring device used to measure the brace part 20.

[0027] Figure 11 yes Figure 5 AA sectional view.

[0028] Figure 12 This is a magnified view illustrating the deformation characteristics of the brace section 20.

[0029] Figure 13 This is a magnified view illustrating the deformation characteristics of the brace section 20.

[0030] Figure 14 This is a partially enlarged view of the dental brace portion 20 according to the second embodiment of the present invention.

[0031] Figure 15 This is a partially enlarged view of the dental brace portion 20 according to the second embodiment of the present invention.

[0032] Figure 16 yes Figure 14 DD sectional view.

[0033] Figure 17 This is a front view of the dental brace portion 20 according to the third embodiment of the present invention.

[0034] Figure 18 This is a front view of the dental brace portion 20 according to the third embodiment of the present invention. Detailed Implementation

[0035] The following is for reference Figures 1 to 18 An embodiment of the toothbrush of the present invention will be described.

[0036] Furthermore, the following embodiments are intended to illustrate one aspect of the present invention and are not intended to limit the invention; modifications can be made freely within the scope of the technical concept of the present invention. Additionally, in the following drawings, for ease of understanding of the structures, the scale, quantities, etc., of each construction differ from the actual construction.

[0037] In the coordinate system shown in the figures, the Z-axis direction is the meshing direction, defined as an up-down direction parallel to the direction extending from axis J. The θ-direction is the circumferential direction centered on axis J, along the tooth row. 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 of that arc. The Y-axis direction is the direction orthogonal to the θ-direction and the Z-axis direction, serving as the depth direction within the oral cavity. In the following description, the direction parallel to the Z-axis direction is referred to as the "meshing direction." Furthermore, the positive side of the Z-axis direction, i.e., the maxillary side, is referred to as the "upper side," and the negative side of the Z-axis direction, i.e., the mandibular side, is referred to as the "lower side." The positive side of the θ-direction is referred to as the "left side," and the negative side of the θ-direction is referred to as the "right side." The positive side of the depth direction, i.e., the lingual side, is referred to as the "medial side," and the negative side of the depth direction, i.e., the buccal side, is referred to as the "lateral side." "Medial side" corresponds to "one side of the depth direction." "lateral side" corresponds to "the other side of the depth direction."

[0038] Figure 1 This is the main view of toothbrush 1.

[0039] like Figure 1 As shown, toothbrush 1 is a toothbrush with a handle 10 and a connecting body 20. Hereinafter, the connecting body 20 will be referred to as the toothbrush handle 20.

[0040] The brace part 20 is vibrated via the holding part 10.

[0041] Shaft 14 protrudes from the holding part 10 and is connected to the dental crown part 20.

[0042] Alternatively, it can be a structure in which the shaft 14 protruding from the brace part 20 is connected to the holding part 10.

[0043] The brace part 20 is vibrated from the holding part 10 via the shaft 14.

[0044] The present invention can be applied to any one of the following structures: a structure that manually imparts brushing action to the dental brace part 20 from the holding part 10 in the up-down, left-right, front-back and their combination directions; a structure that manually imparts vibration; and a structure that electrically imparts vibration to the dental brace part 20 from the holding part 10.

[0045] In this embodiment, an electric drive unit is provided in the holding part 10, and the vibration generated by the drive of the electric drive unit is imparted to the dental brace part 20.

[0046] The electric drive unit includes a power supply unit 11, a vibrating element 12, and a control unit 13. The control unit 13 drives the vibrating element 12 using electricity from the power supply unit 11. The power supply unit 11 is, for example, composed of a rechargeable battery or a regular battery. The vibrating element 12 is, for example, composed of a piezoelectric element, an electromagnetic acoustic transducer, or an unbalanced motor. The vibration generated by the vibrating element 12 is a vibration that repeatedly reverses the direction of rotation at a constant given rotation angle in a rotational direction centered on an axis extending in the depth direction.

[0047] The shaft 14 in the holding part 10, which is connected to the electric drive unit, vibrates by repeatedly reversing the direction of rotation. By driving the vibration element 12 to vibrate the shaft 14, the dental brace part 20 vibrates by repeatedly reversing the direction of rotation.

[0048] [First Embodiment of Braces 20] The brace part 20 has a first brush body 30, a second brush body 60, and a third brush body 80. The first brush body 30 is located inside the holding part 10 in the depth direction. The second brush body 60 is located between the holding part 10 and the first brush body 30 in the depth direction and is separately disposed relative to the first brush body 30. The second brush body 60 is connected to the holding part 10.

[0049] When the brace part 20 is installed in the oral cavity, the first brush body 30 is located on the lingual side, which is more medial to the teeth. When the brace part 20 is installed in the oral cavity, the second brush body 60 is located on the buccal side, which is more lateral to the teeth.

[0050] The first brush body 30 has a first support body 31 and a first brush portion 41. The first support body 31 supports the base end side of the first brush portion 41. Viewed from above, the first support body 31 is formed in a U-shape (horseshoe shape) along the circumferential direction centered on axis J. The first support body 31 is an U-shape with an inner opening.

[0051] The second brush body 60 has a second support body 61 and a second brush portion 71. The second support body 61 supports the base end side of the second brush portion 71. Viewed from above, the second support body 61 is formed in a U-shape (horseshoe shape) along the circumferential direction centered on axis J. The second support body 61 is an U-shape with an inner opening.

[0052] The range of the first brush body 30 and the second brush body 60 relative to the tooth row is not limited to the entire tooth row, but can also be a structure relative to only a part of the incisors (central incisors, lateral incisors), canines, and molars (first molars, second molars, first molars, second molars).

[0053] Figure 2 This is a three-dimensional view of the appearance of the brace section 20 as viewed from the inside in the depth direction.

[0054] Figure 3yes Figure 2 BB section view in the middle.

[0055] like Figure 2 and Figure 3 As shown, the dimension of the first support 31 in the engagement direction is largest on the outer side in the depth direction and gradually decreases towards the inner side. Regarding the upper end of the first support 31, the outer side in the depth direction is at the uppermost position and gradually slopes downwards towards the inner side. Regarding the lower end of the first support 31, the outer side in the depth direction is at the lowermost position and gradually slopes upwards towards the inner side.

[0056] The dimension of the second support 61 in the meshing direction is largest on the outer side in the depth direction and gradually decreases towards the inner side. Regarding the upper end of the second support 61, the outer side in the depth direction is at the uppermost position and gradually slopes downwards towards the inner side. Regarding the lower end of the second support 61, the outer side in the depth direction is at the lowermost position and gradually slopes upwards towards the inner side.

[0057] The maximum dimension of the second support 61 on the outer side of the depth direction in the meshing direction is greater than the maximum dimension of the first support 31 on the outer side of the depth direction in the meshing direction. The minimum dimension of the second support 61 on the inner side of the depth direction in the meshing direction is greater than or equal to the minimum dimension of the first support 31 on the inner side of the depth direction in the meshing direction. The dimension of the second support 61 in the meshing direction is greater than the dimension of the first support 31 in the meshing direction throughout the entire depth direction.

[0058] Figure 4 yes Figure 1 CC section view in the image.

[0059] like Figure 4 As shown, the first brush portion 41 is disposed on the first support body 31 at intervals. The first brush portion 41 is respectively disposed on the upper end side and the lower end side of the first support body 31. The first brush portion 41 extends outward from the brush surface 31a on the outer side of the first support body 31 in the depth direction. The brush surface 31a has a portion that bulges outward and bends circumferentially when viewed from above.

[0060] This embodiment uses a toothbrush 1 with a first brush portion 41 arranged along the teeth and designed to be moved manually or electrically. Therefore, by bending the brush surface 31a, the first brush portion 41 can be moved along the lingual side of the teeth, improving cleaning performance and conformity. Furthermore, the area of ​​the first brush portion 41 can be maximized, which, in the case of electric operation, helps to improve vibration efficiency and cleaning force.

[0061] The first brush portion 41 includes first brush portions 41A, 41B, 41C, and first brush portions 41D, 41E, and 41F. First brush portions 41A, 41B, 41C, and first brush portions 41D, 41E, and 41F extend outward from the brush surface 31a in the depth direction. First brush portion 41A extends outward from the upper end of the brush surface 31a. First brush portion 41B extends outward from a position lower than first brush portion 41A. First brush portion 41C extends outward from a position lower than first brush portion 41B. First brush portion 41D extends outward from the lower end of the brush surface 31a. First brush portion 41E extends outward from a position higher than first brush portion 41D. First brush portion 41F extends outward from a position higher than first brush portion 41E. Figure 1 and Figure 2 As shown, multiple first brush sections 41, including first brush sections 41A, 41B, 41C, 41D, 41E, and 41F, are provided at intervals throughout the entire circumference.

[0062] If the position of tooth engagement in the occlusal direction is defined as the occlusal surface K, then when viewed from the side parallel to the occlusal surface K, the inclination angle of the first brush portion 41 relative to the occlusal surface K is smaller the closer it is to the occlusal surface K, and larger the farther it is from the occlusal surface K. Specifically, the inclination angles of the first brush portions 41A and 41D, which are closest to the gingiva and furthest from the occlusal surface K, are greater than the inclination angles of the first brush portions 41B and 41E and the first brush portions 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 the first brush portions 41B and 41E.

[0063] When biting the brace part 20, the mouth is slightly open. In addition, the size of the tooth surface in the meshing direction is mostly larger than the meshing direction arrangement spacing of the roots of the first brush part 41A and the first brush part 41C, and the meshing direction arrangement spacing of the roots of the first brush part 41D and the first brush part 41F. Therefore, if the tilt angles of the first brush parts 41A to 41C and 41D to 41F are the same, the front end of the first brush parts 41A to 41C and 41D to 41F will be difficult to cover the entire tooth surface in the meshing direction.

[0064] In this embodiment, since the tilt angle increases sequentially from the first brush portion 41C to the first brush portion 41A and from the first brush portion 41F to the first brush portion 41D, even when the mouth is slightly open, the first brush portions 41C and 41F can be made to fit against the lingual tooth cusp side, and the first brush portions 41A and 41D can be made to fit against the lingual gingival side.

[0065] The circumferential arrangement pitches between the first brush portions 41A and 41B adjacent in the meshing direction, between the first brush portions 41B and 41C, between the first brush portions 41D and 41E, and between the first brush portions 41E and 41F are each错开 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 the first brush portions 41D, 41E, 41F are arranged in a staggered pattern (Japanese: 千鳥状). By arranging the first brush portions 41A, 41B, 41C and the first brush portions 41D, 41E, 41F in a staggered pattern, the gaps between the first brush portions 41 can be reduced, and the adhesion to the tooth surface and the cleaning performance can be improved.

[0066] The second brush portions 71 are provided on the second support 61 with an interval therebetween in the vertical direction. The second brush portions 71 are provided on the upper end side and the lower end side of the second support 61, respectively. The second brush portions 71 extend from the brush surface 61a on the inner side in the depth direction of the second support 61 toward the inner side in the depth direction. The brush surface 61a has a portion that is curved in the circumferential direction with a convex shape toward the outside when viewed from above.

[0067] In the present embodiment, the toothbrush 1 uses the second brush portions 71 arranged along the tooth row and is intended to move the second brush portions 71 manually or electrically. Therefore, by curving the brush surface 61a, the second brush portions 71 can be made to follow the buccal side of the tooth row, and the cleaning performance and the adhesion can be improved. In addition, the installation area of the second brush portions 71 can be maximized, and in the case of electric operation, it can contribute to improving the vibration efficiency and the cleaning power.

[0068] The second brush portions 71 include second brush portions 71A, 71B, 71C, 71D and second brush portions 71E, 71F, 71G, 71H. The second brush portions 71A, 71B, 71C, 71D and the second brush portions 71E, 71F, 71G, 71H extend from the brush surface 61a toward the inner side in the depth direction. The second brush portion 71A extends outward from the upper end portion of the brush surface 61a. The second brush portion 71B extends inward from a position lower than the second brush portion 71A. The second brush portion 71C extends inward from a position lower than the second brush portion 71B. The second brush portion 71D extends inward from a position lower than the second brush portion 71C.

[0069] The second brush portion 71E extends inward from the lower end portion of the brush surface 61a. The second brush portion 71F extends inward from a position higher than the second brush portion 71E. The second brush portion 71G extends inward from a position higher than the second brush portion 71F. The second brush portion 71H extends inward from a position higher than the second brush portion 71G.

[0070] As Figure 1 and Figure 2As shown, multiple second brush sections 71, including second brush sections 71A, 71B, 71C, 71D and second brush sections 71E, 71F, 71G, 71H, are provided at intervals throughout the entire circumference.

[0071] When viewed from the side parallel to the occlusal surface K, the inclination angle of the second brush portion 71 relative to the occlusal surface K is smaller the closer it is to K and larger the farther it is from K. Specifically, the inclination angles of the second brush portions 71A and 71E, which are closest to the gingiva and furthest from the occlusal surface K, are greater than those of the second brush portions 71B-7D and 71F-71H. The inclination angles of the second brush portions 71C, 71D, 71G, and 71H, which are closest to the occlusal surface K, are smaller than those of the second brush portions 71A and 71B and the second brush portions 71E and 71F. As an 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. Alternatively, the inclination angle of the second brush portion 71D may be smaller than that of the second brush portion 71C, and the inclination angle of the second brush portion 71H may be smaller than that of the second brush portion 71G.

[0072] When biting the brace part 20, the mouth is slightly open. In addition, the size of the tooth surface in the meshing direction is mostly larger than the meshing direction arrangement spacing of the roots of the second brush part 71A and the second brush part 71D, and the meshing direction arrangement spacing of the roots of the second brush part 71E and the second brush part 71H. Therefore, if the tilt angles of the second brush parts 71A to 71D and 71E to 71H are the same, the front end of the second brush parts 71A to 71D and 71E to 71H will be difficult to cover the entire tooth surface in the meshing direction.

[0073] In this embodiment, since the tilt angle increases sequentially from the second brush portion 71C to the second brush portion 71A and from the second brush portion 71G to the second brush portion 71E, even when the mouth is slightly open, the second brush portions 71C, 71D, 71G, and 71H can be made to fit against the lingual tooth cusp side, and the second brush portions 71A and 71E can be made to fit against the lingual gingival side.

[0074] The circumferential spacing of adjacent second brush portions 71A and 71B, 71B and 71C, 71C and 71D, 71E and 71F, 71F and 71G, and 71G and 71H in the meshing direction is staggered by, for example, half a spacing. That is, when viewed from the direction opposite to the brush surface 61a, the second brush portions 71A, 71B, 71C, 71D and the second brush portions 71E, 71F, 71G, 71H are respectively arranged in a staggered pattern. By arranging the second brush portions 71A, 71B, 71C, 71D and the second brush portions 71E, 71F, 71G, 71H in a staggered pattern, the gap between the second brush portions 71 can be reduced, and the contact with the tooth surface and the cleaning performance can be improved.

[0075] A third brush body 80 is disposed 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 disposed between the first brush body 30 and the second brush body 60 in the depth direction and is formed in a U-shape in the circumferential direction. The connecting portion 81 is plate-shaped and orthogonal to the meshing direction. At least a portion of the connecting portion 81 is connected to the first support body 31 and the second support body 61 in the depth direction.

[0076] Figure 5 This is a front view of the dental crown section 20 after removing the first brush section 41, the second brush section 71, and the third brush section 91. Figure 5 In subsequent accompanying drawings, it is sometimes appropriate to draw drawings with the first brush part 41, the second brush part 71, and the third brush part 91 removed.

[0077] like Figure 5 As shown, the connecting portion 81 of this embodiment has deformation regions S1 located at both ends in the circumferential direction. A first recess 82 is disposed on a side closer to the first support 31 than the center of the connecting portion 81 in the depth direction. The first recess 82 is a linear portion extending circumferentially. The first recess 82 opens outwards at both ends in the circumferential direction. The first recess 82 penetrates the connecting portion 81 in the meshing direction. By providing the first recess 82 in the connecting portion 81, the constraint generated by the connecting portion 81 in the deformation region S1 is reduced, and elastic deformation occurs in the depth direction starting from the circumferential center side (incisor side) of the first recess 82. The first support 31 can move in the depth direction by elastically deforming inwards in the depth direction. That is, 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 in the depth direction by elastic deformation in the deformation region S1.

[0078] In this embodiment, the connecting portion 81 has a second recess 83 in the deformation region S2 located at both circumferential ends. The second recess 83 is disposed on a side closer to the second support 61 than the center of the connecting portion 81 in the depth direction. The second recess 83 is a line extending circumferentially. The second recess 83 opens outward at both circumferential ends. The second recess 83 penetrates the connecting portion 81 in the meshing direction. By providing the second recess 83 in the connecting portion 81, the constraint generated by the connecting portion 81 in the deformation region S2 is reduced, and elastic deformation occurs in the depth direction starting from the circumferential center side (incisor side) of the second recess 83. The second support 61 can move in the depth direction by elastic deformation in the depth direction. That is, by providing the second recess 83 in the connecting portion 81, the first support 31 and the second support 61 can move relative to each other in the deformation region S2 by elastic deformation. In addition, in the following description, the first recess 82 and the second recess 83 are sometimes collectively referred to as recess 84.

[0079] In this embodiment, the connecting portion 81 is connected to the first support body 31 in the depth direction, except for the deformation regions S1 located at both circumferential ends of the first support body 31. The connecting portion 81 is also connected to the second support body 61 in the depth direction, except for the deformation regions S2 located at both circumferential ends of the second support body 61. In other words, the connecting portion 81 is connected to both the first support body 31 and the second support body 61 in the depth direction, except for the deformation regions S1 and S2 located at both circumferential ends. Furthermore, the connecting portion 81 connects the first support body 31 and the second support body 61 at a central position in the engagement direction, excluding the deformation regions S1 and S2.

[0080] The connecting part 81 can be a molded body integrally formed with the first support body 31 and the second support body 61, or it can be connected to the first support body 31 and the second support body 61 after being molded separately with resin, or it can be integrally formed with either the first support body 31 or the second support body 61 and then connected to the other of the first support body 31 and the second support body 61.

[0081] like Figure 2 and Figure 4 As shown, the third brush portion 91 extends from the connecting portion 81 to both sides in the meshing direction. The third brush portion 91 has a mountain-shaped bristle profile with a peak at the midpoint in the depth direction. Because the third brush portion 91 has a mountain-shaped bristle profile, it achieves a distribution that closely conforms to the meshing surfaces of the teeth, thus improving cleaning force. The third brush portion 91 is preferably positioned opposite the molars, for example. Since the third brush portion 91 is positioned opposite the molars and protrudes upwards and downwards, it can effectively clean the meshing surfaces of the molars that are difficult for the first brush portion 41 and the second brush portion 7 to reach.

[0082] Figure 6 and Figure 7 This is a magnified view showing the movement of the braces section 20. Figure 6 and Figure 7 The image shows a partially enlarged view of the second support 61 located on the left side.

[0083] In the toothbrush 1 with the above-described structure, since the first support 31 and the second support 61 can move relative to each other in the depth direction, the molars can be brushed by moving the toothbrush left and right along the tooth row in the depth direction while the toothbrush is biting the brace portion 20. When the brace portion 20 is moved left and right, for example, as... Figure 6 As shown by the hollow arrow, the second end 61b of the second support 61 in the circumferential direction interferes (collides) with the molar T from the incisor side.

[0084] In the deformation region S2, the second support 61 can elastically deform in the depth direction. Therefore, when the second end 61b interferes with the molar T from the incisor side, under the pressure transmitted through the second brush portion 71, such as... Figure 7 As shown, in the deformation region S2, the second support 61 moves outward in the depth direction by elastic deformation, starting from a first inflection point P1 generated on the second side 61c on the outer side in the depth direction. The first inflection point P1 is generated near the circumferential central end of the second recess 83. Examples of elastic deformation of the second support 61 outward in the depth direction starting from the first inflection point P1 include: deformation towards a shape with a larger radius of curvature (Mode A); deformation bending outward in the depth direction with the first inflection point P1 as the center while maintaining the same radius of curvature (Mode B); or deformation towards a shape with a radius of curvature located on the outer side of the depth direction opposite to the center of curvature of the second support 61, wherein the center of curvature of the second support 61 is located more circumferentially centrally than the first inflection point P1 (Mode C). Of these deformations, Mode C elastic deformation is preferred.

[0085] Therefore, when the braces are moved about 20 degrees, they can interact with the molars T without obstruction, allowing for smooth brushing.

[0086] Furthermore, by moving the second support 61 outward in the depth direction through elastic deformation when interfering with the molar T, excessive bending of the second brush portion 71 can be suppressed, thus enabling reliable brushing of the molar T with the bristles.

[0087] The second support 61, which elastically deforms 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 using an elastic restoring force. Thus, the second brush body 60 can reliably brush the molar T from the outside in the depth direction via the second brush portion 71. Furthermore, when the second support 61 leaves the molar T, it returns to its position (posture) before elastic deformation due to interference with the incisor using an elastic restoring force.

[0088] Therefore, even if the position and shape of the molar T interfere with the second support body 61, when the dental brace 20 is moved left and right, the second support body 61 alternately repeats the following postures: a posture that corresponds to the circumferential relative position of the molar T without interfering with the molar T, and a posture that presses the molar T from the outside in the depth direction with elastic restoring force via the second brush part 71. Thus, the second brush body 60 can smoothly perform the brushing action while intermittently and reliably brushing the molar T from the outside in the depth direction using the second brush part 71.

[0089] Figure 8 and Figure 9 This is a magnified view showing the movement of the braces section 20. Figure 8 and Figure 9 The image shows a partially enlarged view of the first support 31 located on the right side.

[0090] In the toothbrush 1 with the above-described structure, when the toothbrush head 20 is moved approximately, for example, as... Figure 8 As shown by the hollow arrow, the first circumferential end 31b of the first support 31 interferes (collides) with the molar T from the incisor side.

[0091] In the deformation region S1, the first support 31 can elastically deform in the depth direction. Therefore, when the first end 31b interferes with the molar T from the incisor side, under the pressure transmitted through the first brush part 41, such as Figure 9 As shown, in the deformation region S1, the first support 31 moves inward in the depth direction by elastic deformation, starting from a second inflection point P2 generated on the first side surface 31c in the depth direction. The second inflection point P2 is generated near the circumferential central end of the first recess 82. The center of curvature of the first support 31, which elastically deforms inward in the depth direction starting from the second inflection point P2, exists on the same side as the center of curvature of the curve of the first support 31 located further circumferentially central than the second inflection point P2. Furthermore, it is preferable to deform towards a shape with a smaller radius of curvature.

[0092] Therefore, when the braces are moved about 20 degrees, they can interact with the molars T without obstruction, allowing for smooth brushing.

[0093] Furthermore, by elastically deforming the first support 31 inward in the depth direction when interfering with the molar T, excessive bending of the first brush portion 41 can be suppressed, thus enabling reliable brushing of the molar T with the bristles.

[0094] The first support 31, which elastically deforms due to interference with the molar T, presses against the molar T from the inside in the depth direction via the first brush portion 41 using an elastic restoring force. Thus, the first brush body 30 can reliably brush the molar T from the inside in the depth direction via the first brush portion 41. Furthermore, when the first support 31 leaves the molar T, it returns to its position (posture) before elastic deformation due to interference with the incisor using an elastic restoring force.

[0095] Therefore, even if the position and shape of the molar T interfere with the first support body 31, when the dental brace 20 is moved left and right, the first support body 31 alternately repeats the following postures: a posture that corresponds to the circumferential relative position of the molar T without interfering with the molar T, and a posture that presses the molar T from the inside in the depth direction with elastic restoring force via the first brush part 41. Thus, the first brush body 30 can smoothly perform the brushing action while intermittently and reliably brushing the molar T from the inside in the depth direction using the first brush part 41.

[0096] like Figure 5 As shown, the second circumference L2 of the second support 61, from the center of the circumference to the second end 61b, is as follows: Figure 7 As shown, the first inflection point P1 generated on the second side 61c of the second support body 61 is located within the range L21 from the second end 61b to 50% of the second circumference L2.

[0097] When the first inflection point P1 deviates from the range L21 up to 50% of the second circumference L2, the second side 61c deflects significantly in the occlusal and depth directions, making it difficult for the second brush part 71 to contact the teeth, thus reducing the cleaning force.

[0098] By positioning the first inflection point P1 within the range L21 up to 50% of the second circumference L2, the tip of the second brush 71 can reliably brush the molar T.

[0099] Figure 10A This is a diagram showing the schematic structure of the measuring device 100 for measuring the brace part 20.

[0100] The measuring device 100 includes a support device 110, a height measuring device 120 such as an altimeter, and a camera device 130. The support device 110 has a support member 111 extending in the horizontal direction. The support member 111 supports the brace portion 20. The depth direction of the circumferential central portion of the brace portion 20 is horizontal, and it is supported and fixed by the support member 111 in a posture in which the first support body 31 and the second support body 61 are arranged vertically. The brace portion 20 supported by the support member 111 is subjected to a constant load in the depth direction by suspending a 200g weight 112 at the second end 61b (technically, for example, the weight is suspended at a position 1mm away from the circumferential central side from the second end 61b).

[0101] When measuring the position of the first inflection point P1 using the measuring device 100, the second support body 61 around the second end 61b is photographed by the camera device 130 before a constant load is applied using the weight 112 at room temperature (e.g., 23°C) and 10 seconds after the constant load is applied.

[0102] Furthermore, by using an optical microscope to measure and compare the photographs taken, the position of the first inflection point P1 can be determined.

[0103] like Figure 5 As shown, relative to the first circumference L1 from the center of the first support 31 to the first end 31b, as Figure 7 As shown, the second inflection point P2 generated on the first side 31c of the first support 31 is located within the range L11 from the first end 31b to 50% of the first circumference L1.

[0104] By positioning the second inflection point P2 within the range L11 up to 50% of the first circumference L1, the tip of the first brush portion 41 can reliably brush the molar T.

[0105] When measuring the position of the second inflection point P2 using the measuring device 100, such as Figure 10B As shown, for example, at room temperature (e.g., 23°C), a 200g weight 113 is suspended from the first end 31b (technically, for example, the weight is suspended 1mm away from the center of the circumference from the first end 31b), and a constant load is applied. Then, the first support 31 around the first end 31b is photographed using the imaging device 130 before the constant load is applied using the weight 113 and 10 seconds after the constant load is applied. Furthermore, by measuring and comparing the photographs using an optical microscope, the position of the second inflection point P2 can be determined.

[0106] Figure 11 yes Figure 5 AA sectional view.

[0107] like Figure 11 As shown by the double-dotted line, by providing the recess 84, the third circumferential end 81a of the connecting portion 81 can move independently of the first support 31 and the second support 61 in the meshing direction by elastic deformation starting from the third inflection point P3 when a given load (e.g., an upper load) is applied in the meshing direction. The third inflection point P3 is generated near the circumferential central end of the recess 84.

[0108] When a given load is applied in the meshing direction, the third end 81a elastically deforms independently of the first support 31 and the second support 61 in the meshing direction. Therefore, when the dental brace 20 is moved left and right, the connecting portion 81 can flex relative to the occlusal surface in the meshing direction according to the unevenness of the occlusal surface of the teeth. Thus, interference between the connecting portion 81 and the occlusal surface of the molars can be suppressed, allowing for smooth brushing.

[0109] In addition, since the occlusal surfaces of the teeth can be brushed with the bristles of the third brush section 91, the molars T can be brushed reliably.

[0110] like Figure 5 As shown, relative to the third circumference L3 from the center of the connecting portion 81 to the third end portion 81a, as Figure 11 As shown, the third inflection point P3 generated at the connecting part 81 is located in the range L31 from the third end 81a to 50% of the third circumference L3.

[0111] When the third inflection point P3 deviates from the range L31 up to 50% of the third circumference L3, the third brush part 91 becomes difficult to contact the teeth due to the large deflection of the connecting part 81 in the meshing direction and the depth direction, and the cleaning force on the molar side is reduced.

[0112] By positioning the third inflection point P3 within the range L31 up to 50% of the third circumference L3, the tip of the third brush section 91 can reliably brush the molar T.

[0113] When measuring the position of the third inflection point P3 using the measuring device 100, firstly, in the measuring device 100, the first support body 31 and the second support body 61 are arranged horizontally, and the brace part 20 is supported by the support member 111 so that the connecting part 81 is in a horizontal position. Furthermore, as... Figure 11As shown by the double-dotted line, for example, a 200g weight 114 is suspended at the third end 81a (technically, for example, the weight is suspended at a position 1mm away from the center of the circumference from the third end 81a), and a constant load is applied. Then, before applying the constant load using the weight 114 and 10 seconds after applying the constant load, the connecting portion 81 around the third end 81a is photographed using the imaging device 130. Furthermore, by measuring and comparing the photographs using an optical microscope, the position of the third inflection point P3 can be determined.

[0114] Figure 12 This is a magnified view illustrating the deformation characteristics of the brace section 20.

[0115] like Figure 12 As shown, when a given load G is applied to the second end 61b of the second support body 61 in the depth direction outward, the displacement of the second end 61b is set as H1. The position P4, which moves only the circumference from the first inflection point P1 to the second end 61b as measured above, is determined. When the given load G is applied to the determined position P4 in the depth direction outward, the displacement of position P4 is set as H2. The displacements H1 and H2 satisfy the relationship H1 > H2.

[0116] When the displacement amounts H1 and H2 are both less than or equal to H1, the central part of the circumferential axis deflects significantly when the brace portion 20 is moved left and right, and the left and right brushing action is only absorbed in the central part of the circumferential axis. In this case, since the ends of the brace portion 20 that do not move to the molar side are not affected by the left and right movements, the force of the second brush portion 71 in removing molar dirt, i.e., the cleaning force on the molar side, is reduced. Therefore, by ensuring that the displacement amounts H1 and H2 satisfy the relationship H1 > H2, a smooth brushing action, including the molars, can be performed when the brace portion 20 is moved left and right, and the molars T can be reliably brushed using the second brush portion 71.

[0117] As a method for determining displacement H1, the following is used Figure 10A The measuring device 100 shown measures the height of the second end 61b of the second support 61 using a height measuring device 120 before applying a given load G to the second end 61b at room temperature. Then, by suspending a 200g weight 112 from the second end 61b (technically, for example, suspending the weight 1mm away from the center of the second end 61b in the circumferential direction), a constant load is applied to the outer side in the depth direction, and the height of the second end 61b is measured using the height measuring device 120 after 10 seconds. By determining the height of the second end 61b before applying the constant load using the weight 112 and 10 seconds after applying the constant load, the displacement H1 of the second end 61b can be determined based on the height differences of the second end 61b.

[0118] As a method for determining displacement H2, using Figure 10C The measuring device 100 shown measures the height of position P4 using a height measuring device 120 before applying a given load G to the second end 61b of the second support 61 at room temperature (e.g., 23°C). Then, by suspending a 200g weight 115 at position P4 and applying a constant load outward in the depth direction, the height of position P4 is measured again using the height measuring device 120 after 10 seconds. By determining the heights of position P4 before applying the constant load using the weight 115 and 10 seconds after applying the constant load, the displacement H2 of position P4 can be determined based on the height differences between positions P4.

[0119] Furthermore, when a given load G1 (not shown) is applied only to the outer side of the second end 61b of the second support body 61 in the depth direction, the displacement of the second end 61b is set as H01, and the displacement of position P4 is set as H02. The displacements H01 and H02 satisfy the relationship H01 > H02.

[0120] When the displacements H01 and H02 are both H01 ≤ H02, similarly to the above, when the brace portion 20 is moved left and right, the central part in the circumferential direction deflects significantly, and the left and right brushing action is only absorbed in the central part in the circumferential direction. In this case, since the ends of the brace portion 20 that do not move to the molar side are not affected by the left and right movements, the force of the second brush portion 71 in removing molar dirt, i.e., the cleaning force on the molar side, is reduced. Therefore, by ensuring that the displacements H01 and H02 satisfy the relationship H01 > H02, a smooth brushing action, including the molars, can be performed when the brace portion 20 is moved left and right, and the molars T can be reliably brushed using the second brush portion 71. In addition, the given load G1 can be the same as or different from the given load G described above.

[0121] The method for measuring displacement H01 is the same as the method for measuring displacement H1.

[0122] As a method for measuring displacement H02, the height of position P4, as determined above, is measured using a height measuring device 120 before applying a constant load to the outer side in the depth direction. Then, at room temperature, as... Figure 10A As shown, a 200g weight 112 is suspended at the second end 61b (technically, for example, the weight is suspended at a position 1mm away from the center side in the circumferential direction from the second end 61b), thereby applying a constant load to the outer side in the depth direction, and the height of position P4 is measured by the height measuring device 120 after 10 seconds.

[0123] By determining the height of position P4 before applying a constant load using weight 112 and 10 seconds after applying the constant load, the displacement H2 of position P4 can be determined based on the height differences of position P4.

[0124] Figure 13 This is a magnified view illustrating the deformation characteristics of the brace section 20.

[0125] like Figure 13 As shown, when a given load G2 is applied to the inner side of the first end 31b of the first support 31 in the depth direction, the first side surface 31c from the second inflection point P2 to the first end 31b elastically deforms into an arc shape with the center of curvature C2 located further inward in the depth direction than the first side surface 31c. More specifically, the center of curvature of the first side surface 31c of the first support 31, which elastically deforms inward in the depth direction starting from the second inflection point P2, exists on the same side as the center of curvature of the curve of the first support 31 located further inward in the circumferential direction than the second inflection point P2. Furthermore, it is preferable to deform into a shape with a smaller radius of curvature.

[0126] The first support body 31 of the first side 31c, which is an arc-shaped deformation region S1, is not linked with the first support body 31 that is closer to the circumferential center than the deformation region S1.

[0127] When the brace portion 20 is moved left and right and the first brush portion 41 reaches the molar, because the curvature of the tooth row is different from that of the brace portion 20, the inner surface of the molar contacts the first support body 31, applying a load in the inward direction of depth. Through this load, the first support body 31 elastically deforms in such a way that the first side surface 31c becomes an arc shape. As a result, when the brace portion 20 is moved left and right, a smooth brushing action can be performed, including on the molar, and the second brush portion 71 can reliably brush the molar T.

[0128] like Figure 10B As shown, the method of applying a given load G2 to the inner side of the first end 31b in the depth direction can be achieved by suspending a 200g weight 113 at room temperature, for example, at a position 1mm away from the central side in the circumferential direction from the first end 31b.

[0129] As an example, in this embodiment, the first support 31 and the second support 61 can be made of materials with different hardness characteristics. The hardness of the first support 31 is preferably greater than that of the second support 61. For the first support 31, it is more preferable to be formed of a soft resin with a Shore A hardness of 50 or higher and a Shore D hardness of 75 or lower. For the second support 61, it is more preferable to be formed of a soft resin with a Shore A hardness of 40 or higher and a Shore D hardness of 70 or lower.

[0130] "Shore A hardness" refers to the A hardness of plastics measured according to JIS K 7215 or JIS K 6253. "Shore D hardness" refers to the hardness of type D hardness tester as specified in JIS K 6253.

[0131] Regarding the outer side of the tooth row in the depth direction, since the gap between the curvature of the brace portion 20 and the curvature of the tooth row is larger on the outer side when the brace portion 20 is moved left and right, and there is also a three-dimensional obstacle caused by the buccal mucosa, the second support 61 located on the outer side is made softer than the first support 31, and can move relatively easily relative to the first support 31 in the depth direction. This allows the second support 61 to deform and improves the following ability of the second brush portion 71 to the tooth row. On the other hand, since the curvature change is smaller on the inner side of the tooth row in the depth direction and there are fewer three-dimensional obstacles, by making the first support 31 located on the inner side harder than the second support 61, the following ability of the first brush portion 41 of the first support 31 to the tooth row can be improved.

[0132] Furthermore, depending on the presence or absence of the aforementioned three-dimensional obstacle and the amount of curvature change, the resistance to circumferential movement of the first support 31 and the second support 61 also differs. In this embodiment, by making the second support 61 more flexible than the first support 31, the second support 61 can easily deform relative to the first support 31 in the circumferential direction, thereby improving the following ability of the second brush portion 71 to the tooth row. This second support 61 is located on the outer side where the resistance to movement is greater.

[0133] Furthermore, regarding the first brush part 41 and the second brush part 71, it is even more preferable that the hardness is within the above-mentioned range. When the hardness of the soft resin is lower than the above-mentioned lower limit value, insufficient scraping force occurs, and when the dental brace part 20 is electrically powered, insufficient vibration transmission also occurs, resulting in reduced cleaning function.

[0134] When the hardness of the soft resin exceeds the above-mentioned upper limit, the first brush part 41 and the second brush part 71 become difficult to bend, the adhesion decreases, and the cleaning function is reduced.

[0135] The soft resin used as the first material constituting the first brush body 30 and the second brush body 60 can be a variety of elastomers, such as polyurethane and silicone.

[0136] Compared to other elastomers such as styrene-based and polyester-based elastomers, polyurethane tends to have higher tensile strength and mechanical wear resistance. Therefore, by using polyurethane in soft resins, even thin-walled resins are difficult to break, thus achieving mechanical strength and long-term use.

[0137] Silicone has exceptionally high heat and chemical resistance, which can reduce quality degradation in the presence of boiling sterilization or dental powder.

[0138] As described above, in the dental brace portion 20 of this embodiment, since the first support body 31 and the second support body 61 can move relative to each other in the depth direction by elastic deformation in the deformation regions S1 and S2 located at both ends in the circumferential direction, when the dental brace portion 20 is moved left and right, a smooth brushing action can be performed on the molars, and the molars T can be reliably brushed using the second brush portion 71.

[0139] [Second Embodiment of Braces 20] Next, refer to Figures 14-15 The second embodiment of the brace part 20 will be described.

[0140] In these diagrams, for and Figures 1-13 Elements that are identical to those in the first embodiment shown are labeled with the same symbols, and their descriptions are omitted.

[0141] Figure 14 This is a partial enlarged view of the dental brace portion 20 of the second embodiment.

[0142] like Figure 14 As shown, in this embodiment, the outer circumferential ends of the first recess 82 and the second recess 83 are disposed on the central circumferential side, which is closer to the third end 81a of the connecting portion 81.

[0143] That is, in this embodiment, the first recess 82 and the second recess 83 do not open outward at both ends in the circumferential direction.

[0144] Therefore, as Figure 8 As shown, when the first support 31 interferes with the molar T, under the pressure transmitted through the first brush part 41, as... Figure 14 As shown, the connecting portion 81, located further outward in the depth direction than the first recess 82 and connected to the first support body 31, extends and retracts in the depth direction. By elastically extending and retracting the connecting portion 81 connected to the first support body 31 in the depth direction, the first support body 31 can elastically deform in the depth direction.

[0145] Similarly, as Figure 6 As shown, when the second support 61 interferes with the molar T, under the pressure transmitted through the second brush portion 71, as... Figure 14 As shown, the connecting portion 81, located further inside the second recess 83 in the depth direction and connected to the second support 61, extends and retracts in the depth direction. Because the connecting portion 81 connected to the second support 61 elastically extends and retracts in the depth direction, the second support 61 can elastically deform in the depth direction.

[0146] The other structures are the same as those in the first embodiment described above.

[0147] In the dental brace portion 20 of this embodiment, in addition to obtaining the same function and effect as the first embodiment described above, since the first recess 82 and the second recess 83 are not opened in the circumferential direction but are formed into a closed shape when viewed from the meshing direction, compared with the structure in which the first recess 82 and the second recess 83 are opened in the circumferential direction, the stress concentration during the elastic deformation of the first support body 31 and the second support body 61 can be mitigated, and the durability can be improved.

[0148] Furthermore, as a structure in which the first recess 82 and the second recess 83 do not open outwards at both ends in the circumferential direction, except... Figure 14 In addition to structures extending in a circumferential linear (e.g., straight) manner as shown, such as Figure 15 As shown, multiple recesses can also be arranged at intervals along the circumference. When this structure is adopted, the same function and effect as the structure in which the first recess 82 and the second recess 83 extend in a linear manner along the circumference can be obtained.

[0149] Furthermore, as a recess 84, it is not necessary for it to extend through the connecting portion 81. Figure 16 yes Figure 14 DD sectional view. For example... Figure 16 As shown, the recess 84 may, for example, be a depression with a bottom on the lower side. Since the wall thickness of the bottom of the recess 84 is relatively thin, the connecting portion 81 can easily expand and contract in the depth direction in the deformation regions S1 and S2. From a molding point of view, the wall thickness of the bottom is preferably 0.3 mm or more.

[0150] When the recess 84 extends through the connecting portion 81, during injection molding of the connecting portion 81 (dental brace portion 20), a molding defect known as burrs may occur on the outer surface of the recess 84. In contrast, by having a bottom in the recess 84, the aforementioned molding defect can be suppressed.

[0151] [Third embodiment of braces 20] Next, refer to Figures 17-18 The third embodiment of the dental brace 20 will be described.

[0152] In these diagrams, for and Figures 1-13 Elements that are identical to those in the first embodiment shown are labeled with the same symbols, and their descriptions are omitted.

[0153] like Figure 17As shown, in this embodiment, the recess 84 is not provided in the connecting portion 81. The connecting portion 81 in this embodiment has a first soft portion 81B formed of the aforementioned soft resin first material, and a second soft portion 81C formed of a second material that is softer and less hard than the first material. The second soft portion 81C is formed from the third end 81a to a specific range extending circumferentially to the central side. In this embodiment, the area where the second soft portion 81C is disposed circumferentially is defined as the deformation region S3. Examples of the second material include materials with a lower hardness than the first material, such as polyurethane, silicone, various elastomers, and butadiene rubber.

[0154] In the above-described brace portion 20, when the first support 31 interferes with the molar T, or when the second support 61 interferes with the molar T, under the pressure transmitted via the first brush portion 41 or the second brush portion 71, the second soft portion 81C, formed of a second material that is softer and less hard than the first material constituting the first soft portion 81B, elastically expands and contracts in the depth direction. As a result, the first support 31 or the second support 61 can elastically deform in the depth direction.

[0155] Therefore, the dental brace portion 20 of this embodiment can achieve the same function and effect as the first embodiment described above.

[0156] Furthermore, in the third embodiment, besides making the connecting portion 81 a structure formed of a second material that is softer and less hard than the first material, such as... Figure 18 As shown, the structure can also be as follows: the first soft part 30B, which is formed of the first material of the soft resin in the first brush body 30 including the first support body 31 and the first brush part 41, is disposed on the central side further circumferentially than the deformation region S3, and the second soft part 30C, which is formed of the second material, is disposed in the deformation region S3.

[0157] Similarly, the structure can also be as follows: the first soft part 60B formed of the first material of the soft resin in the second brush body 60, which includes the second support body 61 and the second brush part 71, is disposed on the central side further circumferentially than the deformation region S3, and the second soft part 60C formed of the second material is disposed in the deformation region S3.

[0158] These Figure 18 The structure shown can also achieve the same function and effect as the first embodiment described above.

[0159] The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but it is self-evident that the present invention is not limited to the above examples. The shapes, combinations, etc. of the structural components shown in the above examples are just examples, and various modifications can be made according to design requirements, etc., without departing from the spirit of the present invention.

[0160] For example, in the first embodiment described above, a structure is shown 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. However, this structure is not limited to this structure, and it may also be a structure in which only one of the first recess 82 and the second recess 83 is provided.

[0161] For example, consider a structure where only the second recess 83 is provided, without the first recess 82. In this case, when the first support 31 interferes with the molar T, the first support 31 does not elastically deform, but the pressure transmitted inward in the depth direction via the first brush portion 41 is transmitted to the second support 61 via the connecting portion 81. Under the action of the pressure inward in the depth direction, the second support 61 presses against the molar T via the second brush portion 71, and elastically deforms outward in the depth direction under the action of its reaction force. Through the elastic deformation of the second support 61 outward in the depth direction, the first support 31 can move relative to the second support 61 inward in the depth direction.

[0162] Furthermore, in the above embodiment, a structure in which the first brush portion 41 and the second brush portion 71 are arranged in the entire circumferential direction relative to the first support body 31 and the second support body 61 is exemplified, but it is not limited to this structure. For example, it may also be a structure in which the first brush portion 41 and the second brush portion 71 are intermittently arranged in the θ direction.

[0163] In addition, besides the braces 20 being a structure that is set in the entire circumference, it could also be a structure that is set in only one area on the left or right.

[0164] Furthermore, in the above embodiment, a structure is illustrated in which a first brush portion 41, a second brush portion 71, and a third brush portion 91 are provided in each of the deformation regions S1, S2, and S3, but the embodiment is not limited to this structure. Any structure 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 the deformation regions S1, S2, and S3 is acceptable.

[0165] In addition, the first brush portion 41 and the second brush portion 71 described in the above embodiments may be filaments integrally formed with the first support body 31 and the second support body 61, or they may be bristle bundles disposed on the first support body 31 and the second support body 61, respectively.

[0166] Furthermore, in the above embodiment, a structure in which the toothbrush 1 has an electrically driven unit in the handle 10 is illustrated, but it is not limited to this structure. The toothbrush 1 may also be structured such that the handle 10 does not have an electrically driven unit, and the user manually applies vibration to the dental brace 20 via the handle 10.

[0167] Explanation of reference numerals in the attached figures 1…toothbrush, 10…handle, 20…tooth brace (connector), 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…connector, 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 area.

Claims

1. A toothbrush, comprising: Controlling Department; and A connecting body, which is connected to the gripping part on one side in the depth direction orthogonal to the meshing direction. The connector has: The first brush body is located on the side further in the depth direction than the holding part; The second brush body is located between the holding portion and the first brush body in the depth direction and is disposed separately from the first brush body; as well as A third brush body is disposed between the first brush body and the second brush body in the depth direction. The first brush body has: The first support body is formed in a U-shape along the circumference centered on an axis extending in the meshing direction; as well as The first brush portion extends from the first support body to the other side in the depth direction. The second brush body has: A second support body, which is formed in a U-shape along the circumferential direction; and The second brush portion extends from the second support body to one side in the depth direction. The third brush body has: The connecting portion is formed in a U-shape along the circumferential direction, and at least a portion of it connects the first support body and the second support body in the depth direction; as well as The third brush portion extends from the connecting portion to both sides in the meshing direction. The first support and the second support are capable of elastically deforming and moving relative to each other in the depth direction at the deformation regions located at both ends in the circumferential direction. In the deformed region, at least one of the first brush portion, the second brush portion, and the third brush portion is provided.

2. The toothbrush according to claim 1, wherein, The connecting portion has a recess in the deformed region, the recess being disposed on a side of the connecting portion closer to at least one of the first support and the second support than the center in the depth direction.

3. The toothbrush according to claim 2, wherein, The recess opens outward at both ends in the circumferential direction.

4. The toothbrush according to any one of claims 1 to 3, wherein, The second support body in the deformation region can move by elastic deformation in the depth direction. The second side surface of the second support body on the other side of the depth direction has a first inflection point generated by elastic deformation accompanying the depth direction. The first inflection point is located within 50% of the second circumference from the second end to the second circumference relative to the second circumference of the second support.

5. The toothbrush according to claim 4, wherein, When a given load is applied to the second end of the second support body on the other side of the depth direction, if the displacement of the second end in the second side is set as H01, and the displacement of the second end from the first inflection point to the circumferential center along the circumferential distance from the first inflection point to the second end is set as H02, then... Then the relationship H01 > H02 is satisfied.

6. The toothbrush according to any one of claims 1 to 3, wherein, The first support body in the deformation region can move by elastic deformation in the depth direction. The first side surface of the first support body on one side of the depth direction has a second inflection point generated by elastic deformation in the depth direction. When a given load is applied to the first end of the first support in the circumferential direction toward one side of the depth direction, the first side from the second inflection point to the first end is an arc shape with the center of curvature located on the side of the depth direction further away than the first side.

7. The toothbrush according to any one of claims 1 to 3, wherein, When a given load is applied to the third circumferential end of the connecting portion in the meshing direction, it can move independently of the first support and the second support in the meshing direction by elastic deformation.

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