CN216932264U - Tooth brush - Google Patents

Abstract

The object is to provide a toothbrush which is inexpensive, has excellent storage properties, can be used without excessive eye light, and can be used for removing food residues between teeth. A toothbrush (1) is provided with a handle (2) having a head (3) and a handle (4) provided at the rear end side of the head (3), wherein tufts are implanted in a plurality of implantation holes (10) formed in an implantation surface (3a), the overall length of the handle (2) is 50mm to 80mm, and the length of the head (3) is greater than or equal to the length of the handleThe ratio of the degree to the total length of the handle (2) is 5% to 25%, the height of the bristles constituting the bristle bundle, based on the bristle-setting surface (3a), is 7.0mm or less, and the hardness of the bristles of the actual length of the bristle bundle is 70N/cm²Above 140N/cm²The following.

Description

Tooth brush

Technical Field

The present invention relates to toothbrushes.

This application claims priority based on Japanese patent application No. 2020-215238, filed in Japan on 24.12.2020, hereby incorporated by reference.

Background

When food residues are stuck between teeth when people go out, a toothpick is generally used for removing the food residues. However, young people, especially women, feel unsightly when using toothpicks and are therefore reluctant to remove food debris from between the teeth when going out.

Although toothbrushes are used as tools for removing food waste, ordinary toothbrushes are large in size and poor in storage property, and therefore are difficult to carry. Portable brushes having a telescopic or folding function are also known. However, such a portable brush is complicated in structure, and therefore, the cost is liable to increase, and it is liable to remain moisture adhering thereto during use, and hence, it is not hygienic. Patent document 1 discloses an inexpensive and portable means for putting a disposable toothbrush in a cartridge and carrying it.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open publication No. 2002-262942

SUMMERY OF THE UTILITY MODEL

[ problem to be solved by the utility model ]

However, the portable toothbrush as in patent document 1 is required to be put in a cartridge, and therefore, the form is limited, the cleaning function is liable to be deteriorated, and it is difficult to remove food residues held between teeth.

The utility model aims to provide a toothbrush which is low in cost, excellent in storability, capable of being used without excessive eye light of other people, and capable of removing food residues clamped between teeth.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

The present invention has the following aspects.

[1] A toothbrush comprises a handle body having a head part having a bristle surface and a handle part provided on the rear end side of the head part,

hair bundles are implanted in the hair implanting holes formed on the hair implanting surface,

the toothbrush is characterized in that,

the total length of the handle body is more than 50mm and less than 80mm,

a ratio of the length of the head to the entire length of the stem is 5% to 25%,

the height of the bristles constituting the tufts, measured on the bristle-setting surface, is 7.0mm or less,

the actual length (actual length) of the wool bundle has a hardness of 70N/cm²Above 140N/cm²The following.

[2] The toothbrush according to [1], wherein the handle body is further provided with a neck portion connecting the head portion and the handle portion,

the length of the neck part is more than 10mm and less than 30 mm.

[3] The toothbrush according to [1] or [2], wherein a ratio of a maximum thickness of the handle to a maximum thickness of the head is 1.0 or more and 2.5 or less.

[4] The toothbrush according to [2] or [3], wherein a ratio of a maximum width of the head portion to a minimum width of the neck portion is 1.2 or more and 2.5 or less.

[5] The toothbrush according to any one of [2] to [4], wherein a ratio of a maximum width of the handle portion to a minimum width of the neck portion is 1.2 or more and 2.5 or less.

[6] The toothbrush according to any one of [2] to [5], wherein a ratio of a length of the neck portion to a maximum width of the neck portion is 5.0 or more and 8.0 or less.

[7] The toothbrush according to any one of [2] to [6], wherein the maximum width of the head portion is 5.0mm or more and 8.0mm or less, the maximum width of the handle portion is 3.0mm or more and 8.0mm or less,

the maximum width of the neck is below the minimum width of the head and below the minimum width of the handle.

[8] The toothbrush according to any one of [2] to [7], wherein a total length of the head and the neck is 25mm or more and 45mm or less, and a length of the handle is 25mm or more and 45mm or less.

[9] The toothbrush according to any one of [1] to [8], wherein a ratio of a length of the handle portion to a maximum width of the handle portion is 5.0 or more and 8.0 or less.

[ Utility model effect ]

The utility model provides a toothbrush which is inexpensive, has excellent storage properties, can be used without excessive eye light, and can be used for removing food residues between teeth.

Drawings

Fig. 1 is a front view of a handle of the toothbrush of an embodiment.

Fig. 2 is a side view of the handle of the toothbrush of an embodiment.

Fig. 3 is an enlarged side view of the head and tufts of the toothbrush of the embodiment.

[ reference numerals ]

1 … toothbrush, 2 … handle, 3 … head, 3a … hair planting surface, 3b … back, 4 … handle, 5 … neck, 10 … hair planting hole, 12 … hair bundle, 14 … hair planting part.

Detailed Description

Hereinafter, an example of the embodiment of the toothbrush according to the present invention will be described with reference to the drawings. The following embodiment is an embodiment of the present invention, and is not intended to limit the present invention, and may be arbitrarily modified within the scope of the technical idea of the present invention. In the drawings below, for the sake of easy understanding of the respective structures, the actual structures are different from the structures in scale, number, and the like.

As shown in fig. 1 and 2, the toothbrush 1 of the embodiment has a handle body 2. The shank 2 includes: a head 3 having a flocked surface 3a, a shank 4 provided on the rear end side of the head 3, and a neck 5 connecting the head 3 and the shank 4. As shown in fig. 3, the toothbrush 1 can perform tooth brushing by forming implanted parts 14 by implanting tufts 12 into a plurality of implanted holes 10 formed in an implanted surface 3a of a head 3.

In the following description, the side of the head 3 on which the bristle surface 3a is provided (bristle surface side) is referred to as the front side of the toothbrush 1, and the side opposite to the side of the head 3 facing the bristle surface 3a is referred to as the back side of the toothbrush 1. The direction in which the handle 2 extends is defined as the longitudinal direction, the direction parallel to the implanted surface 3a and perpendicular to the longitudinal direction is defined as the width direction of the toothbrush 1, and the direction perpendicular to the implanted surface 3a is defined as the thickness direction of the toothbrush 1. The side (head side) on which the head 3 is provided is the front end side, and the side (shank side) on which the shank 4 is provided is the rear end side.

The boundary between the head 3 and the neck 5 is an end point of a reduction in width of a chamfer on the neck 5 side in the shape of the head 3 in a frontal view, that is, a position where a change in width of a pair of outer edges forming the chamfer changes from reduction to fixation or enlargement. When the shape of the boundary between the head 3 and the neck 5 is unclear in a front view, a position 16% from the tip of the stem 2 in the longitudinal direction with respect to the entire length of the stem 2 is defined as the boundary between the head 3 and the neck 5.

The following inflection points are defined as boundaries between the neck portion 5 and the stem portion 4, and the inflection points change from the outer side to the inner side of the stem 2 along the center of a circle forming a curve of the outer edge of the neck portion 5 from the neck portion 5 to the stem portion 4 in a front view (the inflection points change from a curve forming the outer edge of the neck portion 5 protruding inward to a curve protruding outward). When the shape of the boundary between the neck portion 5 and the stem portion 4 in the front view is unclear, the boundary between the neck portion 5 and the stem portion 4 is defined as a position 41% from the tip of the stem portion 2 with respect to the entire length of the stem portion 2 in the longitudinal direction.

The toothbrush 1 is a miniature toothbrush (miniature size toothbrush) having a handle 2 with a total length of 50mm to 80 mm. The overall length of the shank 2 is preferably 60mm to 70 mm. When the total length of the handle 2 is equal to or greater than the lower limit of the above range, the toothbrush 1 is easily found from the storage place (bag, pouch, box, etc.) during use, and is not easily lost, and is easily taken out from the storage place by pinching, and the operability is improved. When the total length of the grip 2 is equal to or less than the upper limit of the above range, the grip is easy to use even in an outdoor place because of its good storage property and portability.

As the resin constituting the grip body 2, only a hard resin may be used, only a soft resin may be used, or both a hard resin and a soft resin may be used. In view of suppressing the amount of deflection during tooth brushing, it is preferable to use only a hard resin as the resin constituting the handle body 2. The resin constituting the stem 2 may be 1 kind or 2 or more kinds.

Examples of the hard resin include polypropylene (PP), Polyacetal (POM), polycyclohexylenedimethylene terephthalate (PCT), polyethylene terephthalate (PET), Polycarbonate (PC), acrylonitrile-butadiene-styrene resin (ABS), and polymethyl methacrylate (PMMA). In addition, biodegradable resins, plant-derived resins, paper-mixed resins, plant-mixed resins, and the like can be used. Among them, PP is preferable in terms of excellent moldability and advantageous cost. PCT and PC are preferred because of their high transparency, excellent visibility of food residues during brushing, and good appearance.

Examples of the soft resin include olefin elastomers, styrene elastomers, polyester elastomers, and polyurethane elastomers.

As shown in fig. 1, the head 3 is formed in a substantially rectangular shape in a front view.

Unlike a conventional toothbrush, the micro-sized toothbrush 1 having a total length of 50mm to 80mm is used in a manner such that the distance between the position of the hand holding the handle 4 and the position of the head 3 is short. Further, a more detailed operation is required for brushing teeth than in the case of using a general toothbrush. From these viewpoints, the ratio of the length of the head 3 to the entire length of the stem 2 is 5% or more and 25% or less, preferably 5% or more and 18% or less. When the ratio is equal to or more than the lower limit of the above range, not only can a sufficient amount of hair bundles be secured and food waste can be easily removed, but also a distance between the head 3 and the hand holding the grip 4 can be sufficiently secured and operability can be improved. When the above ratio is not more than the upper limit of the above range, the distance between the hand holding the handle 4 and the head 3 is not too long, and not only the operation can be performed easily and finely, but also food waste can be easily hidden and easily seen by the head 3 when the user brushes his/her teeth while looking at a mirror.

The length of the head 3 is preferably 3.0mm to 20mm, more preferably 8.0mm to 15 mm. When the length of the head 3 is equal to or greater than the lower limit of the above range, the cleaning function is easily ensured. When the length of the head 3 is equal to or less than the upper limit of the above range, food waste is not easily hidden by the head 3 and can be easily seen when the user brushes his/her teeth while looking at the mirror.

The maximum width of the head 3 is preferably 5.0mm or more and 8.0mm or less, and more preferably 6.0mm or more and 7.0mm or less. When the maximum width of the head 3 is equal to or greater than the lower limit of the above range, the cleaning function is easily ensured. When the maximum width of the head 3 is not more than the upper limit of the above range, food waste is not easily hidden by the head 3 and can be easily seen when the user brushes his/her teeth while looking at the mirror.

The maximum thickness of the head 3 is preferably 1.5mm or more and 3.0mm or less, and more preferably 1.5mm or more and 2.0mm or less. When the maximum thickness of the head 3 is equal to or greater than the lower limit of the above range, strength is easily ensured. When the maximum thickness of the head 3 is equal to or less than the upper limit of the above range, the operability is easily ensured.

The length of the neck portion 5 is preferably 10mm to 30mm, more preferably 10mm to 20 mm. When the length of the neck portion 5 is equal to or greater than the lower limit of the above range, the fingers holding the handle portion 4 are less likely to touch the cheeks during brushing, and operability is improved. Further, the distance between the head portion 3 and the handle portion 4 is set to a certain degree, whereby excessive force during brushing can be suppressed, and the feeling of brushing with appropriate force can be improved. When the length of the neck portion 5 is equal to or less than the upper limit of the above range, the distance between the head portion 3 and the fingers gripping the grip portion 4 is appropriately reduced, and excessive movement of the head portion 3 can be suppressed by a minute movement of the fingers, so that the operability is improved. Further, since the handle 4 is close to the head 3, a force is easily applied during brushing, and thus, the feeling of brushing teeth with an appropriate force is improved.

The total length of the head 3 and the neck 5 is preferably 25mm to 45mm, more preferably 25mm to 35 mm. When the total length is not less than the lower limit of the above range, the fingers holding the handle 4 are not easily inserted into the mouth during brushing, and the operability is excellent. When the total length is equal to or less than the upper limit of the above range, the head 3 and the neck 5 are less likely to be twisted or bent, and the strength is increased, thereby improving the cleaning performance. Further, the distance between the head 3 and the fingers gripping the grip 4 is appropriately reduced, and excessive movement of the head 3 can be suppressed by a minute movement of the fingers, so that the operability is improved.

The minimum width of the neck portion 5 is preferably 1.5mm or more and 7.0mm or less, and more preferably 1.5mm or more and 4.0mm or less. When the minimum width of the neck portion 5 is equal to or greater than the lower limit of the above range, strength can be easily secured. When the minimum width of the neck portion 5 is equal to or less than the upper limit of the above range, the neck portion 5 is less likely to touch the mouth during brushing, and operability is easily ensured.

The ratio of the length of the neck portion 5 to the maximum width of the neck portion 5 is preferably 5.0 to 8.0, and more preferably 5.5 to 7.5. In the toothbrush 1 having the above ratio satisfying the above range, the length of the neck portion is shorter than that of the normal toothbrush with respect to the minimum width of the neck portion. When the ordinary toothbrush is used for brushing teeth, the toothbrush is slightly moved in the axial direction of the toothbrush, but when the micro-sized toothbrush 1 is used for removing food waste, the toothbrush is not moved in the axial direction but moved in the width direction or in a rolling method. In this usage, when the neck portion is elongated, the amount of distortion and the amount of deflection of the neck portion increase. Therefore, in the micro-sized toothbrush 1, it is important to widen the maximum width of the neck portion 5 and shorten the length of the neck portion 5, as compared with the general toothbrush. When the above ratio is within the above range, the load applied to the neck portion 5 is reduced, and the neck portion 5 is less likely to be twisted or bent, so that the tooth brushing becomes easy.

The neck portion 5 is preferably flat in shape having a longer width direction than a thickness direction. Thus, the toothbrush is difficult to flex in the width direction during brushing, and cleaning of teeth is facilitated. The ratio of the minimum width of the neck portion 5 to the minimum thickness of the neck portion 5 is preferably 0.5 or more and 2.0 or less, and more preferably 0.9 or more and 1.4 or less.

The minimum thickness of the neck portion 5 is preferably 1.5mm or more and 3.0mm or less, and more preferably 2.0mm or more and 3.0mm or less. When the minimum thickness of the neck portion 5 is equal to or more than the lower limit of the above range, strength can be easily secured. When the minimum thickness of the neck portion 5 is not more than the upper limit of the above range, the neck portion 5 is less likely to touch the mouth during brushing, and operability is easily ensured.

In the toothbrush 1, it is preferable that the minimum thickness of the neck portion 5 is 1.5mm or more and 3.0mm or less, and the ratio of the minimum width of the neck portion 5 to the minimum thickness of the neck portion 5 is 1.0 or more and 2.0 or less.

The ratio of the maximum width of the head 3 to the minimum width of the neck 5 is preferably 1.2 or more and 2.5 or less, and more preferably 1.3 or more and 2.0 or less. In the toothbrush 1 having the above ratio satisfying the above range, the minimum width of the neck portion with respect to the maximum width of the head portion is wider than that of a general toothbrush. When a general toothbrush is used for brushing teeth, the toothbrush is slightly moved in the axial direction of the toothbrush, but when food waste is removed by the micro-sized toothbrush 1, the toothbrush is not moved in the axial direction but moved in the width direction or rotated. In such a method, when the neck width is reduced, the neck is twisted or bent, and thus, the tooth brushing becomes difficult. Therefore, in the micro-sized toothbrush 1, it is important to widen the width of the neck portion with respect to the maximum width of the head portion, rather than to be narrowed in a shape similar to that of the general toothbrush. When the above ratio is within the above range, the load applied to the neck portion 5 is reduced, and the neck portion 5 is less likely to be twisted or bent, so that the tooth brushing becomes easy. In addition, when the ratio is within the above range, it is easy to confirm the teeth and food residues by a mirror during tooth brushing, and it becomes easy to remove the food residues.

The length of the stem 4 is preferably 25mm to 45mm, more preferably 30mm to 40 mm. When the length of the handle portion 4 is equal to or greater than the lower limit of the above range, the handle portion 4 can be easily held with a finger. When the length of the handle 4 is equal to or less than the upper limit of the above range, the distance between the head 3 and the fingers gripping the handle 4 becomes appropriately short, and excessive movement of the head 3 can be suppressed by a minute movement of the fingers, so that the operability is improved.

The ratio of the length of the shank 4 to the maximum width of the shank 4 is preferably 5.0 to 8.0, more preferably 5.5 to 7.5. When the above ratio is within the above range, the toothbrush 1 can be easily finely moved by pinching the handle 4 so as to be surrounded by the tips of the thumb, index finger, and middle finger.

The maximum width of the stem 4 is preferably 3.0mm or more and 8.0mm or less, and more preferably 5.0mm or more and 8.0mm or less. When the maximum width of the shank 4 is equal to or greater than the lower limit of the above range, the shank 4 is easily held, and thus the operability is easily ensured. When the maximum width of the handle 4 is equal to or less than the upper limit of the above range, the toothbrush 1 is excellent in storage and portability.

The shank 4 is preferably flat in shape with its width direction longer than its thickness direction. It becomes easy to hold the handle 4 in a pen grip type (pen grip) or a manner of pinching with a thumb, an index finger, and a middle finger, and it is difficult for the finger holding the handle 4 to touch the face. The ratio of the maximum width of the shank 4 to the maximum thickness of the shank 4 is preferably 1.0 to 3.0, and more preferably 1.0 to 2.0.

The maximum thickness of the stem 4 is preferably 3.0mm or more and 6.0mm or less, and more preferably 3.5mm or more and 5.5mm or less. When the maximum thickness of the shank 4 is equal to or greater than the lower limit of the above range, strength is easily ensured. When the maximum thickness of the handle portion 4 is not more than the upper limit of the above range, the handle portion can be easily grasped with fingers, and the operability can be easily ensured.

In the toothbrush 1, it is preferable that the maximum thickness of the handle 4 is 3.0mm or more and 6.0mm or less, and the ratio of the minimum width of the handle 4 to the maximum thickness of the handle 4 is 1.0 or more and 3.0 or less.

The ratio of the maximum thickness of the shank 4 to the maximum thickness of the head 3 is preferably 1.0 to 2.5, and more preferably 1.3 to 2.2. In the toothbrush 1 in which the above ratio satisfies the above range, the thickness of the head portion is thicker relative to the handle portion as compared with a conventional toothbrush. In the full-length micro-sized toothbrush 1, the distance between the hand for pinching the handle portion and the face is short. In this case, if the thickness of the entire hair-planted portion or the thickness of the head portion constituting the hair-planted portion is smaller than the thickness of the stem portion, the hand is likely to hit the face, and the operability is deteriorated. Therefore, in the micro-sized toothbrush 1, it is important to make the thickness of the head portion thick relative to the handle portion. When the ratio is not less than the lower limit of the above range, the handle portion 4 can be easily held with a finger, and the cleaning property and the storage property are excellent. When the above ratio is not more than the upper limit of the above range, the fingers holding the handle 4 are less likely to touch the cheeks during brushing even if the handle 2 is short, and the operability is improved.

The ratio of the maximum width of the stem 4 to the minimum width of the neck 5 is preferably 1.2 to 2.5, and more preferably 1.3 to 2.0. In the toothbrush 1 in which the above ratio satisfies the above range, the maximum width of the handle portion is smaller than the minimum width of the neck portion as compared with a conventional toothbrush. While a general toothbrush is a pen-grip type or a palm grip type, the micro toothbrush 1 needs to be finely moved with the tip of a finger, and therefore, a grip method of surrounding the handle with the tip of a thumb, an index finger, or a middle finger is adopted. In a toothbrush having a shape similar to that of a general toothbrush and being small, the handle portion has a wide width and is difficult to grip by being surrounded by three fingers. Therefore, in the micro toothbrush 1, it is important to reduce the value of the maximum width of the handle portion with respect to the minimum width of the neck portion as compared with the general toothbrush. When the above ratio is within the above range, the load applied to the neck portion 5 is reduced, and the neck portion 5 is less likely to be twisted or bent, so that the tooth brushing becomes easy. When the above ratio is within the above range, it becomes easy to hold and finely move the handle 4 of the toothbrush 1.

In the toothbrush 1, it is preferable that the maximum width of the head 3 is 5.0mm or more and 8.0mm or less, the maximum width of the handle 4 is 3.0mm or more and 8.0mm or less, the maximum width of the neck 5 is less than the minimum width of the head 3, and the maximum width of the neck 5 is less than the minimum width of the handle 4. This makes it possible to easily hold the toothbrush 1, improve operability, ensure a sufficient cleaning function, and improve storage and portability.

In the hair-planting surface 3a of the head 3 of this example, 6 hair-planting holes 10 having a circular opening shape are formed. In the longitudinal direction of the stem 2, 2 rows of 3 implantation holes 10 are formed side by side. As shown in fig. 3, a tuft 12 formed by bundling a plurality of brush hairs is implanted into each implanted hole 10, and an implanted portion 14 is formed. For example, a plurality of bristles (monofilaments) are gathered into a bundle and folded into two, and a metal fastener (retainer) (not shown) called a flat wire (flat plate) is inserted therebetween and driven into the implantation holes 10, thereby implanting the bundle 12 into each of the implantation holes 10.

The number of implanted holes 10 is not limited to 6, but may be 5 or less, or may be 7 or more. The number of implantation holes 10 may be 1. The number of the hair-planting holes 10 is preferably 4-9 in terms of an angle for easily removing food residues between teeth.

The arrangement pattern of the implantation holes 10 is not limited to that of the present embodiment, and may be designed as appropriate.

The diameter of the implantation hole 10 is preferably 1.0mm to 1.5 mm.

The bristles constituting the bundle 12 are not particularly limited, and examples thereof include straight (straight) bristles, tapered (taper) bristles having a gradually smaller diameter toward the tip of the bristles, and tip-end branched bristles. Among them, straight bristles are preferable in terms of easy removal of food waste.

The material of the brush is not particularly limited, and examples thereof include polyamide, polybutylene terephthalate, polytrimethylene terephthalate, polyolefin (such as polypropylene), styrene elastomer, polyester elastomer, and polyurethane elastomer.

The shape of the tip portion of the bundle of bristles 12 is not particularly limited, and examples thereof include a flat (flat) shape, a mountain (mountain) shape, a dome (dome) shape, and an arch (arch) shape. Among them, a straight shape and an arch shape are preferable because the implanted part 14 is in a plane contact with the teeth and an angle from which food waste is easily removed.

The height H (FIG. 3) of the bristles constituting the bundle 12 is 7.0mm or less, preferably 3.0mm to 5.0mm, based on the flocked surface 3 a. When the bristle height H is not less than the lower limit of the above range, the fingers holding the handle 4 during brushing do not easily touch the cheeks, and thus the operability is improved. When the height H of the bristles is equal to or less than the upper limit of the above range, the bristles are less likely to deflect, so that not only the operability is improved, but also the distance between the head 3 and the tooth surface during brushing is reduced, and thus, a delicate operation is facilitated.

The bristle diameter is preferably 4.0 to 6.5 mils, more preferably 5.0 to 6.0 mils.

Since the bristle-implanted area and the bristle length of the micro toothbrush 1 are greatly different from those of a general toothbrush, when the specification of the bristle-implanted portion is set in consideration of the use feeling of the general toothbrush, the bristles become very hard, the gum is injured, and on the contrary, the cleaning feeling cannot be obtained. Therefore, in the micro toothbrush 1, it is necessary to set the specification of the implanted part 14 in a concept different from that of the general toothbrush. The specification of the bristle-implanted portion 14 of the toothbrush 1 satisfies the following conditions: the height of the brush hair is below 7mm and the actual length of the hair bundle 12The hardness of the wool is 70N/cm²Above 140N/cm²The following conditions were used. In view of the sense of reality of use of the miniature toothbrush 1, it is very important to satisfy these conditions. In the case of a normal toothbrush, the strength of the bristle is set to 70N/cm in the actual length²Above 140N/cm²In the following range, the bristles are very hard and may damage the gums. However, in the micro toothbrush 1, the bristle stiffness of the actual length of the tufts 12 is set to the above range, whereby both the prevention of the injury and the feeling of cleaning are achieved. In order to make the hardness of the hair of the actual length of the hair bundle at 70N/cm²Above 140N/cm²In the following ranges, the bristle implanting area and the bristle height must be designed densely, and the bristle stiffness of the actual length of the bristle bundle is out of the above ranges in consideration of the design concept of a general toothbrush having different use feeling.

The actual length of the bundle 12 has a stiffness of 70N/cm²Above 140N/cm²Hereinafter, more preferably 80N/cm²Above 140N/cm²Hereinafter, more preferably 80N/cm²Above, 130N/cm²The following. When the hardness of the actual length of the tufts 12 is equal to or higher than the lower limit of the above range, the tufts 12 are less likely to flex excessively and dirt is easily removed, so that the feeling of cleanliness is improved. In addition, since the feeling of cleanliness is improved, the user does not need to exert excessive force. If the stiffness of the actual length of the tufts 12 is less than the upper limit of the above range, the bristles will not feel painful when they touch the gums. Therefore, the user can be inhibited from weakening the brushing force in order to avoid pain, and the user can easily obtain a feeling of removing the tooth stain with a moderate force.

In addition, the actual-length stiffness is the following value: the value obtained by measuring a length (actual length) of a toothbrush in a bristle-implanted state as a sample without trimming the length of toothbrush bristles according to the "hardness of bristles" test of JIS S3016. The strength of the actual length of the bristles can be adjusted by adjusting the length and diameter of the bristles.

The ratio of the maximum thickness of the head 3 to the maximum distance D (fig. 3) from the back surface 3b of the head 3 to the front end of the tuft 12 is preferably 20% or more and 40% or less, and more preferably 20% or more and 30% or less. When the ratio is within the above range, the strength of the head 3 is easily ensured.

The ratio of the maximum distance D from the back surface 3b of the head 3 to the tip of the tuft 12 to the maximum thickness of the stem 4 is preferably 1.3 or more and 2.0 or less, and more preferably 1.3 or more and 1.7 or less. When the ratio is not less than the lower limit of the above range, the finger holding the handle is less likely to touch the face during brushing, and operability is easily ensured. When the above ratio is equal to or less than the upper limit of the above range, the distance between the fingers holding the handle and the teeth becomes short, and the operability is easily ensured.

The toothbrush 1 as described above is not similar in shape to a general toothbrush, can be easily held even when it is small in size, and can exhibit a sufficient cleaning function because operability and reach of the head to the teeth are ensured. The toothbrush 1 may be a reusable type toothbrush, or may be a disposable type toothbrush.

The toothbrush 1 is particularly suitable for removing food debris caught in the crevices between the front teeth. For example, food debris is removed from crevices between teeth by performing the following actions: the handle 4 is held so as to be surrounded by the tips of the thumb, index finger, and middle finger, and the head 3 is moved in the width direction while looking at the mirror, thereby brushing the teeth or rotating the head.

The method for manufacturing the toothbrush 1 is not particularly limited. For example, injection molding and blow molding can be exemplified as a molding method of the stem 2, and injection molding is preferable. As the runner (runner) for injection molding, a cold runner may be used, or a hot runner, preferably a hot runner. The gate (gate) of the injection molding is not particularly limited, and for example, a direct gate (direct gate) can be exemplified. The toothbrushes 1 after being manufactured may be in a state of being separated one by one, or may be in a state of being connected in the width direction by a flow path at the time of injection molding.

As described above, the toothbrush of the present invention is a full-length micro-sized toothbrush having a handle body. Therefore, the container can be used without being conscious of eye light, and is excellent in storability and low in cost. Further, since the head portion has a suitable size for the entire length of the handle, the brush is short in height and the stiffness of the brush is high in the actual length, a sufficient cleaning function is ensured, and food residues caught between teeth can be easily removed.

The toothbrush of the present invention is not limited to the toothbrush 1. For example, the toothbrush of the present invention may be a structure in which no neck is provided between the head and the handle.

The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following descriptions.

[ examples 1 to 9]

Toothbrush samples of examples 1 to 9 were produced in the same manner as the toothbrushes shown in FIGS. 1 to 3, according to the specifications shown in Table 1. PCT was used as a resin constituting the stem body. The diameter of the implanted hole is 1.0 to 1.5mm, and a bundle of straight hairs formed of polyamide (Ny) is implanted by flat plate type hair implantation.

[ comparative examples 1 to 3]

Toothbrush samples similar to examples 1 to 9 were produced except that the specifications shown in table 1 were changed.

[ evaluation method ]

After brushing teeth at an outgoing place with a toothbrush sample by a 10-person professional group, (1) storage property, portability, and easiness of taking, (2) toothbrush operability, and (3) feeling of cleaning (brushing with moderate force) were evaluated. In each evaluation, a score of 7 was assigned, a "very good" score of 7, a "general" score of 4, and a "very bad" score of 1. The scores of 10 persons were averaged and judged by the following criteria. The evaluation results of the examples are shown in table 1.

(criteria for determination)

A: the average score was 6.6 points or more.

B: the average score was 5.6 points or more and less than 6.6 points.

C: the average score was 4.6 points or more and less than 5.6 points.

D: the average score was 4.0 points or more and less than 4.6 points.

E: the average score was less than 4.0.

[ TABLE 1]

As shown in table 1, in examples 1 to 9 in which the total length of the handle, the ratio of the length of the head to the total length of the handle, the bristle height of the bristles, and the bristle strength of the actual length of the tufts were in appropriate ranges, good results were obtained in all of storage property, portability, easy taking-out property, operability of the toothbrush, and feeling of cleaning.

On the other hand, in comparative examples 1 to 3 in which 1 or more of the total length of the handle, the ratio of the length of the head to the total length of the handle, the height of the bristles, and the hardness strength of the actual length of the tufts were not suitable, the toothbrush was not sufficient in terms of the operability and cleaning feeling. In comparative example 2 in which the entire length of the grip body was long, the evaluation of the storage property, the portability and the easy-to-take property was also poor.

Claims (9)

1. A toothbrush comprises a handle body having a head part having a bristle surface and a handle part provided on the rear end side of the head part,

hair bundles are implanted in the hair implanting holes formed on the hair implanting surface,

it is characterized in that the preparation method is characterized in that,

the total length of the handle body is more than 50mm and less than 80mm,

the ratio of the length of the head to the entire length of the shank is 5% to 25%,

the height of the bristles constituting the tufts, measured on the bristle-setting surface, is 7.0mm or less,

the actual length of the bundle of bristles has a stiffness of 70N/cm²Above 140N/cm²The following.

2. The toothbrush of claim 1,

the handle body is further provided with a neck portion connecting the head portion and the handle portion,

the length of the neck part is more than 10mm and less than 30 mm.

3. The toothbrush according to claim 1 or 2, characterized in that the ratio of the maximum thickness of the handle to the maximum thickness of the head is from 1.0 to 2.5.

4. The toothbrush according to claim 2, wherein a ratio of a maximum width of the head portion to a minimum width of the neck portion is 1.2 or more and 2.5 or less.

5. The toothbrush of claim 2, wherein a ratio of a maximum width of the handle to a minimum width of the neck is from 1.2 to 2.5.

6. The toothbrush according to claim 2, wherein a ratio of a length of the neck portion to a maximum width of the neck portion is 5.0 or more and 8.0 or less.

7. The toothbrush of claim 2,

the maximum width of the head part is 5.0mm to 8.0mm, the maximum width of the handle part is 3.0mm to 8.0mm,

the maximum width of the neck is below the minimum width of the head and below the minimum width of the handle.

8. The toothbrush of claim 2, wherein the head and neck have a total length of from 25mm to 45mm, and the handle has a length of from 25mm to 45 mm.

9. The toothbrush according to claim 1 or 2, wherein a ratio of a length of the handle to a maximum width of the handle is 5.0 or more and 8.0 or less.

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