JP5736734B2 - toothbrush - Google Patents

Description

  The present invention relates to a toothbrush.

  Normally, the handle portion of the toothbrush is made of a thermoplastic resin, but in the case of a thermoplastic resin, there is a problem that it is slippery when gripped. For this reason, various types of toothbrushes have been proposed and put to practical use in which a non-slip portion made of a synthetic rubber or a thermoplastic elastomer is provided on the handle portion to prevent slipping when gripped and the operability is improved. For example, a toothbrush provided with a front side anti-skid part and a back side anti-skid part near the tip of the handle part on the neck side, and an annular non-slip part connected over the entire outer periphery of the handle part near the base end opposite to the neck part Has been proposed (for example, Patent Document 1). In addition, a toothbrush has been proposed in which a thermoplastic elastomer material covering portion is provided along the handle near the boundary between the neck portion and the grip portion and on the tail end side over the entire outer periphery of the handle portion (for example, Patent Document 2). .

Japanese Patent No. 3162573 JP 2000-4944 A

  However, the thickness of the handle portion is set in consideration of the operability of the toothbrush and cannot be made too thick. As described above, the handle portion is made of synthetic rubber or thermoplastic elastomer over the entire area on the front and back sides. The formation of the non-slip portion has a problem that the thickness and the rigidity of the handle portion are lowered because the thickness of the thermoplastic resin as the core material has to be reduced.

  In general, as a method of gripping the handle portion of the toothbrush in toothbrushing, a pen grip method in which the neck portion of the toothbrush handle portion is held with a pencil with the thumb, index finger and middle finger, and the neck portion of the toothbrush handle portion. There are two methods, the palm grip method, in which the thumb is attached to the side and the remaining fingers and palm hold the entire handle portion. A firm grip with the palm grip method requires a relatively flat handle cross-sectional shape and an improved thumb grip, and a relatively thick handle cross-section for fine angle adjustment with the pen grip method. It is necessary to improve the shape and grip of the thumb, forefinger, and middle fingertips. The palm grip method and the pen grip method differ in the position where the toothbrush is gripped, and it is necessary to improve the usability of each method, but it is difficult to make them compatible, especially the usability of the pen grip method has been improved. The device is hardly made in the conventional toothbrush. Therefore, a toothbrush with good operability is desired regardless of which method is used.

  Therefore, the object of the present invention is to ensure a sufficient anti-slip effect during brushing operation without lowering the strength and rigidity against bending of the handle part, and to improve the operability of the toothbrush in both the palm grip method and the pen grip method. It is providing the toothbrush which can be made to do.

The toothbrush which concerns on a 1st aspect is a toothbrush which has a flocking part, a neck part, and a handle part, Comprising: The said handle part is substantially level | step difference on the handle base made from a synthetic resin material, and the surface of the said handle base The left and right sides of the front end side abdominal part and the front end side back part located on the neck side of the handle part are provided with a front end side abdominal side surface and a front end side back side surface, which are configured with an elastomer part smoothly connected to each other, On the left and right sides of the base end side abdomen and the base end side back located on the base end side opposite to the neck side of the handle part, a base end side abdomen side surface and a base end side back side surface which are inclined surfaces are provided, The elastomer portion includes the distal side abdomen, the distal side abdominal side , the distal side abdominal side , the proximal side abdomen, the proximal side back, the proximal side abdominal side, the proximal side back side, and the Communication connecting the distal side abdomen and the proximal side abdomen Provided, the elastomeric portion convex portion is formed on the distal flank and the distal-side back of the handle base is provided is the distal-side ventral side the elastomeric portion is provided, the distal-side back side The base end side ventral surface and the base end side dorsal side surface are formed with a plurality of recesses extending in the longitudinal direction of the handle portion .

Toothbrush according to the second aspect is a toothbrush according to the first embodiment, the thickness of the elastomeric portion is Ru 0.8~1.5mm der.

  The toothbrush which concerns on a 3rd aspect is a toothbrush which concerns on a 1st aspect or a 2nd aspect, Comprising: The cross section of radial direction is formed in the substantially hexagonal shape in the said handle | steering-wheel part.

  The toothbrush which concerns on a 4th aspect is a toothbrush which concerns on the aspect in any one of a 1st aspect to a 3rd aspect, Comprising: The said synthetic resin material is transparent.

  According to the toothbrush which concerns on a 1st aspect, the convex part is formed in the front end side abdominal part provided with the elastomer part, and the front end side back part of the handle base, and the front end side abdominal side surface provided with the elastomer part, the front end side back A plurality of concave ridges extending in the longitudinal direction of the handle base are formed on the side surface and proximal side of the abdomen, so that the handle portion can be securely gripped according to how to hold the pen grip method, palm grip method, etc. Thus, the operability of the toothbrush can be further improved. In addition, since the elastomer part is provided around the part where the fingers touch the handle part, the amount of thermoplastic elastomer used is reduced as much as possible, so the ratio of the handle base made of synthetic resin material can be increased. It is possible to suppress a decrease in strength and rigidity of the handle portion.

  According to the toothbrush according to the second aspect, in the pen grip method, the distal end side of the handle portion is gripped by the thumb, forefinger and middle finger, so that the base end side of the handle portion is placed between the thumb and the index finger by brushing operation (brushing operation). However, the proximal end side of the handle portion is formed by the elastomer portion provided on the proximal end side of the handle portion and the plurality of concave strips formed on the proximal side abdominal side surface and the proximal side back side surface. Since it fits between the thumb and the index finger, it is possible to perform the brushing operation in a stable state. In addition, the concave strips formed on the tip side ventral side and tip side dorsal side surface prevent the thumb and index finger from slipping when the handle part is gripped by the pen grip method. It becomes possible to improve. In addition, since the convex part is formed on the tip side abdomen and tip side back, it plays the role of preventing slipping of the middle finger in the pen grip method and sliding of the thumb and index finger in the palm grip method, so that the operation of the toothbrush It becomes possible to improve the property.

  According to the toothbrush which concerns on a 3rd aspect, since the cross section of the radial direction of a handle | steering-wheel part is formed in a substantially hexagon, it becomes possible to improve ease of holding.

  According to the toothbrush which concerns on a 4th aspect, the external appearance of a toothbrush can be improved.

It is a figure which shows the structure of the toothbrush which is embodiment of this invention. It is a figure which shows the structure of the toothbrush which is embodiment of this invention. It is a figure which shows the structure of the toothbrush which is embodiment of this invention. It is a figure which shows the structure of the toothbrush which is embodiment of this invention. It is sectional drawing which looked at the handle | steering-wheel part from the cut surface line VV of FIG. It is sectional drawing which looked at the handle | steering-wheel part from the cut surface line VI-VI of FIG. It is sectional drawing which looked at the handle | steering-wheel part from the cut surface line VII-VII of FIG. It is a figure for demonstrating the external shape of the cross section of the radial direction of a handle | steering-wheel part. It is a figure for demonstrating the state which hold | gripped the toothbrush which is embodiment of this invention by the pen grip method. It is a figure for demonstrating the state which hold | gripped the toothbrush which is embodiment of this invention by the palm grip method.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  1-4 is a figure which shows the structure of the toothbrush 1 which is embodiment of this invention. 1 is a perspective view of the toothbrush 1, FIG. 2A is a front view of the toothbrush 1, FIG. 2B is a side view of the toothbrush 1, FIG. 3 is a rear view of the toothbrush 1, and FIG. 1 is a longitudinal (longitudinal) cross-sectional view of a toothbrush 1. As illustrated in FIGS. 1 to 4, the toothbrush 1 includes a flocked portion 4, a neck portion 3, and a handle portion 2. The flocking unit 4 includes a flocking table 7 and a hair bundle 8. The handle part 2 includes a handle base 5 and an elastomer part 6.

  The flocking table 7, the neck 3 and the handle base 5 are integrally formed of a synthetic resin material. Examples of synthetic resin materials include polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyoxymethylene, styrene / acrylonitrile resin, acrylonitrile / butadiene / styrene resin, cellulose propionate, polyamide, polymethyl methacrylate, and polyarylate. It is possible to use a hard synthetic resin material such as.

  The appearance of the toothbrush can be further improved by making the synthetic resin material transparent. “Transparent” means that visible light can be permeated in a state where the handle is molded. Further, even a resin in which a small amount of a substance that does not transmit visible light (for example, lame or pigment) is mixed can be transparent if it can transmit visible light. As the transparent synthetic resin, a resin having a value measured by the test method of JIS K 7105 of 80% or more is particularly preferable. As transparent synthetic resin materials, synthetic resin materials such as polyethylene terephthalate, polycarbonate, styrene / acrylonitrile resin, acrylonitrile / butadiene / styrene resin, cellulose propionate, polyamide, polymethyl methacrylate, and polyarylate can be used. It is.

  The flocking table 7 of the flocking part 4 can be formed in a known shape such as a general substantially rectangular shape or a substantially egg shape. A plurality of flock holes are formed in a predetermined arrangement on the flocking table 7, and a hair bundle 8 is implanted in the flock hole.

  The handle portion 2 is composed of a handle base 5 made of a synthetic resin material and an elastomer portion 6 that is smoothly connected to the surface of the handle base 5 without a substantial step, and a moderate curve that protrudes toward the ventral side. It is formed in a shape. The handle portion 2 is provided with a through hole 40 for hooking the toothbrush 1 on a hook or the like.

5-8 is a figure for demonstrating the cross-sectional shape of the radial direction of the handle | steering-wheel part 2. As shown in FIG. 5 is a cross-sectional view of the handle portion 2 as viewed from the cutting plane line V-V of FIG. 2, FIG. 6 is a cross-sectional view of the handle portion 2 as viewed from the cutting plane line VI-VI, and FIG. It is sectional drawing seen from the cut surface line VII-VII. FIG. 8 is a schematic view showing the outer shape of a cross section of the handle portion 2 as viewed from the cutting plane line VV in FIG. The handle portion 2 has a substantially hexagonal cross section in the radial direction. Specifically, distal side abdominal side surfaces 22 and 23 that are inclined surfaces are provided on the left and right sides of the distal side abdominal part 20 located on the neck side and the flocked surface side of the handle part 2. On the other hand, tip side dorsal side surfaces 26 and 27 that are inclined surfaces are provided on the left and right sides of the tip side back portion 30 located on the neck side of the handle portion 2 and on the back side of the tip side abdomen 20. Therefore, on the distal end side of the handle portion 2, the radial cross section has a substantially hexagonal shape due to the six surfaces of the distal end side abdominal portion 20, the distal end side abdominal side surfaces 22 and 23, the distal end side back portion 30, and the distal end side dorsal side surfaces 26 and 27. Is formed. Further, on the left and right sides of the proximal side abdominal portion 21 and the proximal end side back portion 31 that are located on the proximal side opposite to the neck side of the handle portion 2, proximal side abdominal side surfaces 24 and 25 that are inclined surfaces and the proximal end are provided. Side-back surfaces 28 and 29 are provided. Therefore, on the proximal end side of the handle portion 2, the radial cross section is defined by the six surfaces of the distal end side abdominal portion 20, the proximal end side abdominal side surfaces 24 and 25, the proximal end side back portion 31, and the proximal end side back side surfaces 28 and 29. It is formed in a substantially hexagonal shape. Since the toothbrush 1 is provided with six surfaces around the handle portion 2, the finger holding the handle portion 2 can be stably held without rotating. Therefore, it is possible to improve the ease of holding the handle portion 2 by forming the handle portion 2 in a substantially hexagonal cross section. In particular, when gripping by the pen grip method, the thumb, the index finger, and the middle finger are gripped, but the thumb, the index finger, and the middle finger may be supported by the surfaces provided around the handle portion 2 respectively. it can.

  As shown in FIG. 8, on the cross section, a point where the distal side abdominal side 22 and the distal side dorsal side 27 are in contact is a vertex 35, and a point where the distal side abdominal side 23 and the distal side dorsal side 26 are in contact is a vertex 36. To do. A vertex on the distal side abdomen 20 is a vertex 37 and a vertex on the distal side back portion 30 is a vertex 38. A straight line connecting the vertexes 35 and 36 is a straight line 33, and a straight line connecting the vertex 37 and the vertex 38 is a straight line 34. When the length of the straight line 34 is a and the length of the straight line 33 is b, the ratio of a: b, that is, the aspect ratio of the cross section in the radial direction of the handle portion 2 is 1: 1.310 to 1: 1.375. A range is preferable. In the palm grip method, when the shape of the cross section in the radial direction is a regular hexagon (regular hexagonal aspect ratio 1: 1.155), the handle portion 2 is easy to rotate and it is difficult to stably place the thumb and index finger, The operability is improved with a slightly flat shape rather than a regular hexagon. Therefore, in the ratio of a: b, it is preferable that a is 1 and b is 1.310 or more. On the other hand, in the pen grip method, it is possible to stably arrange the thumb and index finger when the tip side ventral surfaces 22 and 23 are wide while maintaining a certain height in the vertical direction, and the operability is improved. : B ratio, it is preferable that a is 1 and b is 1.375 or less. Further, in the straight line 34, the length from the intersection of the straight line 33 and the straight line 34 to the vertex 37 of the tip side abdomen 20 is c, and the length from the intersection of the straight line 33 and the straight line 34 to the vertex 38 of the tip side back part 30. When d is d, the ratio of c: d is preferably in the range of 1: 1 to 1: 0.7 in order to improve operability. Furthermore, the cross section in the radial direction of the handle portion 2 has an equal shape on the left and right with respect to the straight line 34 connecting the apex 37 and the apex 38. The shapes of the vertices 35 and 36, which are the left and right ends of the radial section of the handle portion 2, are curved by R processing so that minute angle adjustment can be easily performed, especially in the rotation operation when brushing with the pen grip method. It is desirable to have a shape. A desirable range of the radius of the R-treated surface is 3.5 mm or more and 2.5 mm or less.

  The elastomer part 6 is integrally formed of a thermoplastic elastomer material. The elastomer portion 6 includes a distal side abdominal portion 20, distal end side abdominal side surfaces 22, 23, distal end side rear side surfaces 26, 27, a proximal end side abdominal portion 21, a proximal end side back portion 31, a proximal end side abdominal side surface 24.25, and a proximal end side. The back side surfaces 28 and 29 and the communication portion 15 that connects the distal end side abdominal portion 20 and the proximal end side abdominal portion 21 are provided.

  The elastomer portion 6 includes a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer, a polyester-based thermoplastic elastomer, a polyamide-based thermoplastic elastomer, a 1,2-polybutadiene-based thermoplastic elastomer, and an ethylene-vinyl acetate system. It is possible to use an elastomer material such as a thermoplastic elastomer, a polyvinyl chloride thermoplastic elastomer, a natural elastomer thermoplastic elastomer, a fluorine elastomer thermoplastic elastomer, a trans-polyisoprene thermoplastic elastomer, a chlorinated polyethylene thermoplastic elastomer, etc. Is possible. Further, the hardness of the elastomer portion 6 is preferably in the range of 40 to 90 in terms of the durometer A, and if it is in the range of 40 to 90, the fit to the fingertips is good when gripped by the pen grip method. . A more preferable range is 45 or more and 85 or less, and a further preferable range is 45 or more and 65 or less.

  In the state where the handle base 5 is set in a mold (not shown), the elastomer portion 6 is pressurized and injected with a thermoplastic elastomer material melted into the annular recess 14 from the back side, and the above-described distal end side abdominal portion 20 and distal end side Abdominal side surfaces 22, 23, distal side back side surfaces 26, 27, proximal side abdominal portion 21, proximal side back side portion 31, proximal side abdominal side surface 24.25, proximal end side back side surfaces 28, 29, and distal side abdominal portion 20; The communicating portion 15 that communicates with the proximal end abdominal portion 21 is filled with a thermoplastic elastomer material and solidified to be integrated with the handle base 5. The thickness of the elastomer portion 6 is set in the range of 0.5 to 2.0 mm, preferably about 0.8 to 1.5 mm, and the amount of the thermoplastic elastomer material is reduced as much as possible while It is configured to prevent filling failure. As shown in FIGS. 1 to 4, the elastomer portion 6 formed by filling a thermoplastic elastomer material is smoothly connected to the surface of the handle base 5 without any step. Moreover, it is preferable to provide the front end side abdominal part 20 in the position of 75-110 mm from the front-end | tip of the hair transplant part 4, and it is still more preferable to provide in the position of 80-105 mm.

  Furthermore, for the purpose of preventing finger slipping during tooth brushing operation, a convex portion 17 is formed on the distal end side abdomen 20 provided with the elastomer portion 6, and a convex portion 18 is formed on the distal end side back portion 30 of the handle base 5. The The convex portions 18 are arranged in the handle longitudinal direction. The shape of the projections 17 and 18 may be any shape such as a circle, a square shape, or a character, and these shapes are formed in a protruding shape. The height of the protrusion is preferably 0.05 to 1.0 mm, and more preferably 0.1 to 0.5 mm.

  Further, the distal side abdominal side surfaces 22 and 23 provided with the elastomer portion 6, the distal end side rear side surfaces 26 and 27, the proximal end side abdominal side surfaces 24 and 25, and the proximal end side rear side surfaces 28 and 29 are arranged in the longitudinal direction of the handle portion 2. A plurality of concave strips 22a, 23a, 24a, 25a, 26a, 27a, 28a, and 29a extending substantially in parallel to is formed.

  Next, the operation of the toothbrush 1 will be described. 9 and 10 are diagrams for explaining a pen grip method and a palm grip method, which are general methods for gripping a handle portion of a toothbrush in tooth brushing. FIG. 9 shows a state where the toothbrush 1 is gripped by the pen grip method, and FIG. 10 shows a state where the toothbrush 1 is gripped by the palm grip method.

  As shown in FIG. 9, the pen grip method is a method in which the neck portion of the handle portion 2 of the toothbrush 1 is gripped with a thumb, an index finger, and a middle finger so as to hold a pencil. As shown in FIG. 10, the palm grip method is a method in which a thumb is attached to the neck portion of the handle portion 2 of the toothbrush 1 and the handle portion 2 is gripped by the remaining fingers and palm.

  As shown in FIG. 9, when the handle portion 2 is gripped with a pen grip, the thumb and the index finger are disposed on the distal side abdominal side surfaces 22 and 23, and the middle finger is disposed on the distal end side back portion 30. Then, the thumb and the index finger come into contact with the concave strips 22a and 23a, and the middle finger comes into contact with the convex portion 18 at the tip side back portion 30. Further, in the operation of slightly rotating the bristles when performing the brushing operation while holding the handle portion 2 with the pen grip, specifically, in the operation of adjusting the angle of the bristles of the toothbrush with respect to the tooth surface, The concave stripe 26 a on the distal side dorsal side surface 26, the convex part 18 on the distal end side dorsal portion 30, and the concave line 27 a on the leading end side dorsal side surface 27 come into contact. An operation for slightly rotating the hair tip when a brushing operation is performed by gripping the handle portion 2 with a pen grip by a plurality of concave strips 22a, 23a, 26a, 27a extending substantially parallel to the longitudinal direction of the handle portion 2. In this case, it is possible to easily stop the finger at a desired position, and it is possible to improve the operability when grasped by the pen grip method. In the pen grip method, concave portions are provided on the side portions of the distal side abdominal side surfaces 22 and 23, the distal end side rear side surfaces 26 and 27, the proximal side abdominal side surfaces 24 and 25, the proximal side rear side surfaces 28 and 29, and the like. This is because these side parts are gripped by the thumb, index finger, and middle finger with a relatively weak force, and if convex parts are installed on these side parts, only the protruding parts of the convex parts will come into contact with the fingers. This is because it is difficult to rotate the hair tip.

  Also, as shown in FIG. 10, when the handle portion 2 is gripped with a palm grip, the thumb is disposed on the distal side abdomen 20, and the index finger is disposed on the distal side back portion 30 and the distal side dorsal side surfaces 26, 27. The little finger and the ring finger are arranged on the proximal side abdominal portion 21, the proximal side back portion 31, the proximal side abdominal side surface 24.25, and the proximal side back side surfaces 28 and 29. Then, the thumb comes into contact with the convex portion 17, the index finger comes into contact with the convex portion 18 and the concave stripes 26a and 27a, and the little finger and ring finger come into contact with the concave stripes 24a, 25a, 28a and 29a. By forming the convex portions 17 and 18, when the handle portion 2 is gripped by the palm grip, the convex portion 17 plays a role of preventing the thumb from slipping, and the convex portion 18 plays a role of preventing the middle finger from slipping. Therefore, the operability can be improved. In the palm grip method, a thumb is pressed against the tip side abdomen 20 with a relatively strong force to grip the tip side abdomen 20 and the tip side back portion 30 in a wrapping manner, but the tip side abdomen 20 and the tip side back portion 30 are convex. By providing the portion, the convex portion fits to the finger, and it becomes possible to exert a strong grip force during the tooth brushing operation.

  According to the toothbrush 1 of the present invention, on the distal side abdomen 20 provided with the elastomer portion 6 and the distal side 30 on the distal end side of the handle base 5, the convex portions 17 and 18 are formed, and the distal side where the elastomer portion 6 is provided. A plurality of concave strips 22a, 23a extending in the longitudinal direction of the handle base are formed on the ventral side surfaces 22, 23, the distal side dorsal side surfaces 26, 27, the proximal end side abdominal sides 24, 25, and the proximal end side dorsal side surfaces 28, 29. Since 24a, 25a, 26a, 27a, 28a, and 29a are formed, the handle portion 2 can be securely held in accordance with how to hold the palm grip method, the pen grip method, or the like, and the operability of the toothbrush 1 is achieved. Can be further improved.

  Further, as described above, since the elastomer portion 6 is formed only in a necessary portion, the ratio of the thermoplastic elastomer material used for the handle portion 2 can be reduced, and the production cost of the toothbrush 1 can be reduced. Since the ratio of the elastomer portion 6 in the handle portion 2 is reduced, it is possible to suppress a decrease in strength and rigidity of the handle portion 2. Furthermore, since the thermoplastic elastomer material whose temperature drop is gradual can be reduced, the molding time of the toothbrush 1 can be shortened.

  Next, the paneler test performed with respect to the toothbrush 1 of this invention is demonstrated. The sensory evaluation when the Example which is the toothbrush 1 actually performed a toothbrushing action by the palm grip method and the pen grip method was performed. Evaluation was performed on 24 persons (15 males, 9 females; average age 40.6 years old), and an absolute evaluation of 7 levels (1 to 7 points) was made. In the evaluation, (1) ease of holding, (2) ease of brushing the teeth on the opposite side of the handle in the palm grip method, (3) ease of brushing teeth on the same side as the handle in the palm grip method, (4) Easiness of brushing teeth on the opposite side of the handle with the pen grip method, (5) Ease of brushing teeth on the same side as the handle with the pen grip method, (6) Handle depending on the site of brushing The average value of points for each item of ease of change when changing. In the paneler test, results as shown in Table 1 were obtained.

  From the test results shown in Table 1, the product is: (1) ease of holding, (2) ease of brushing teeth on the opposite side of the handle in the palm grip method, and (3) handle in the palm grip method. Ease of brushing teeth on the same side, (4) Ease of brushing teeth opposite the handle with the pen grip method, (5) Ease of brushing teeth on the same side as the handle with the pen grip method, ( 6) Good results are obtained for all items of ease of holding when changing the handle according to the toothbrushing site, particularly good results for easy brushing and holding of teeth by the pen grip method. It was.

  Note that the configurations described in the above embodiments and modifications may be replaced as appropriate as long as no contradiction arises. These modifications can also achieve the same effects as in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Toothbrush 2 Handle part 3 Neck part 4 Flocked part 5 Handle base 6 Elastomer part 7 Flocked table 6 Elastomer part 8 Hair bundle 15 Communication part 17, 18 Convex part 20 Front end side abdomen 21 Base end side abdomen 22, 23 End side abdominal side 24, 25 Base end side ventral surface 26, 27 Tip side dorsal side surface 28, 29 Base end side dorsal side surface 22a, 23a, 24a, 25a, 26a, 27a, 28a, 29a Groove 30 Tip side back portion 31 Base end side back portion

Claims (4)

A toothbrush having a flocked portion, a neck portion, and a handle portion,
The handle portion is composed of a handle base made of a synthetic resin material and an elastomer portion that is smoothly connected to the surface of the handle base without a substantial step,
On the left and right of the tip side abdomen and the tip side back part located on the neck side of the handle part, a tip side belly side surface and a tip side back side surface which are inclined surfaces are provided,
On the left and right sides of the base end side abdomen and the base end side back located on the base end side opposite to the neck side of the handle part, a base end side abdomen side surface and a base end side back side surface which are inclined surfaces are provided,
The elastomer portion includes the distal side abdomen, the distal side abdominal side , the distal side abdominal side , the proximal side abdomen, the proximal side back, the proximal side abdominal side, the proximal side back side, and the Provided in the communication portion that communicates the distal side abdomen and the proximal side abdomen ,
Convex portions are formed on the tip side abdomen provided with the elastomer portion and the tip side back portion of the handle base,
A plurality of recesses extending in the longitudinal direction of the handle portion are formed on the distal side ventral surface, the distal end side lateral surface, the proximal end lateral side surface and the proximal end lateral side surface provided with the elastomer portion. A toothbrush characterized by that. Toothbrush according thickness of the elastomeric portion to claim 1 Ru 0.8~1.5mm der.   The toothbrush according to claim 1, wherein the handle portion has a substantially hexagonal cross section in the radial direction. The toothbrush according to any one of claims 1 to 3, wherein the synthetic resin material is transparent.

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