WO2023127309A1 - Brosse à dents électrique - Google Patents

Brosse à dents électrique Download PDF

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Publication number
WO2023127309A1
WO2023127309A1 PCT/JP2022/041335 JP2022041335W WO2023127309A1 WO 2023127309 A1 WO2023127309 A1 WO 2023127309A1 JP 2022041335 W JP2022041335 W JP 2022041335W WO 2023127309 A1 WO2023127309 A1 WO 2023127309A1
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WO
WIPO (PCT)
Prior art keywords
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brush body
tip
rear end
base portion
Prior art date
Application number
PCT/JP2022/041335
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English (en)
Japanese (ja)
Inventor
アンナ タスキナ
玲央奈 野田
Original Assignee
ライオン株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ライオン株式会社 filed Critical ライオン株式会社
Publication of WO2023127309A1 publication Critical patent/WO2023127309A1/fr

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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B13/00—Brushes with driven brush bodies or carriers
    • A46B13/02—Brushes with driven brush bodies or carriers power-driven carriers
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C17/00—Devices for cleaning, polishing, rinsing or drying teeth, teeth cavities or prostheses; Saliva removers; Dental appliances for receiving spittle
    • A61C17/16—Power-driven cleaning or polishing devices
    • A61C17/22—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like
    • A61C17/32—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating
    • A61C17/34—Power-driven cleaning or polishing devices with brushes, cushions, cups, or the like reciprocating or oscillating driven by electric motor

Definitions

  • the present invention relates to electric toothbrushes.
  • This application claims priority based on Japanese Patent Application No. 2021-214802 filed in Japan on December 28, 2021, and the contents thereof are incorporated herein.
  • an electric toothbrush has a main body and a replaceable brush body, and a motor incorporated in the main body vibrates a shaft (shaft) to vibrate a replaceable brush body fitted to the shaft.
  • the replacement brush body has a head portion positioned at the tip, a neck portion extending from the head portion toward the main body, and a brush portion provided on the head portion.
  • an invention has been proposed that controls the vibration of the brush portion in order to enhance the feeling of cleaning the oral cavity and the cleaning power.
  • US Pat. No. 5,400,000 it is proposed to select the spring rate of the spring member in accordance with the frequency dependent amplitude of the workpiece in an instrument having a workpiece that vibrates due to the action of the spring member.
  • Patent Document 2 proposes an electric toothbrush in which the width in front view is larger than the thickness in side view at the position of the minimum diameter in the neck portion. According to the invention described in Patent Document 2, the cleaning power is improved by increasing the amplitude of the vibration of the hair bundle in the height direction.
  • the thickness of the head part is made thinner in order to make it easier to handle in the oral cavity (higher operability) and to increase the cleaning power on the interdental and cervical areas.
  • the vibration transmitted from the brush portion to the object to be cleaned is weakened, and there is a problem that the feeling of cleaning is lowered.
  • the present invention has the following aspects. ⁇ 1> having a main body and a replacement brush body,
  • the main body has a drive section provided inside, and a shaft connected to the drive section and having a protruding tip
  • the replaceable brush body has a base portion including a neck portion and a head portion provided at the tip of the neck portion, and a brush portion provided on one surface of the head portion
  • the replaceable brush body is detachably connected to the shaft by receiving the tip of the shaft inside the base portion
  • the head portion has a thickness of 2.5 mm or more and 3.5 mm or less
  • the mass of the replaceable brush body is 3.0 g or more and 7.0 g or less
  • the electric toothbrush wherein the center of gravity of the replaceable brush body is located at 35.3% or more and 70.0% or less from the front end of the replaceable brush body toward the rear end.
  • ⁇ 2> The electric toothbrush according to ⁇ 1>, wherein the frequency of the head portion measured with a stroboscope is 15000 rpm or more and 50000 rpm or less.
  • a hollow portion extending from the rear end to the front end is formed in the base portion, The electric toothbrush according to ⁇ 1> or ⁇ 2>, wherein the length of the hollow portion is 35% or more of the distance from the rear end of the base portion to the tip of the neck portion.
  • a hollow portion extending from the rear end to the front end is formed in the base portion,
  • ⁇ 5> The electric toothbrush according to any one of ⁇ 1> to ⁇ 4>, wherein the tip of the shaft is positioned at 15.8% or more and 30.8% or less from the rear end of the replaceable brush body toward the tip. .
  • the base portion tapers from the rear end toward the tip of the neck portion, The electric toothbrush according to any one of ⁇ 1> to ⁇ 5>, wherein the cross-sectional area of the tip of the neck portion is 2% or more and 43% or less of the cross-sectional area of the rear end of the base portion.
  • ⁇ 7> The electric toothbrush according to any one of ⁇ 1> to ⁇ 6>, wherein the width of the head portion when viewed from the front is 1.2 times or more and 5.0 times or less than the minimum width of the neck portion when viewed from the front.
  • the base includes polyacetal.
  • the electric toothbrush of the present invention has excellent operability and excellent cleaning experience.
  • FIG. 1(a) is a front view of an electric toothbrush according to one embodiment of the present invention.
  • FIG.1(b) is a side view of the electric toothbrush which concerns on one Embodiment of this invention.
  • FIG. 1B is a cross-sectional view taken along the line II-II shown in FIG.
  • FIGS. 3(a) to 3(c) are process diagrams for explaining the method of measuring the center of gravity of the replaceable brush body.
  • 4(a) and 4(b) are process diagrams for explaining a method for measuring the swing angle of the head.
  • the electric toothbrush of the present invention has a main body and a replaceable brush body detachable from the main body.
  • a replaceable brush body detachable from the main body.
  • the electric toothbrush 1 shown in FIGS. 1(a) and 1(b) has a cylindrical main body 10 and a replaceable brush body 30 provided at the tip of the main body 10 in the longitudinal direction.
  • the main body 10 and the replacement brush body 30 are elongated as a whole.
  • the direction in which the replaceable brush body 30 is positioned in the longitudinal direction is defined as the front end side
  • the direction in which the main body 10 is positioned is defined as the rear end side.
  • the main body 10 constitutes at least part of the grip.
  • a switch 20 is provided on the outer surface of the main body 10 .
  • the main body 10 has a housing 11, a driving section 12, a power supply 14, a circuit section 15, and a shaft 18.
  • the drive unit 12 , the power supply 14 and the circuit unit 15 are housed inside the housing 11 .
  • the drive unit 12 is housed near the tip of the housing 11 .
  • the power supply 14 is housed near the rear end of the housing 11 .
  • the shaft 18 is connected with the driving part 12 .
  • the tip of the shaft 18 protrudes from the tip of the housing 11 .
  • the rear end of the housing 11 has a detachable cover, which enables replacement of the internal power source 14 .
  • the shape of the housing 11 is not particularly limited as long as it can be gripped by a user and the inside can be liquid-tightly sealed, and for example, a cylindrical shape or a rectangular tubular shape can be selected.
  • the material of the housing 11 is not particularly limited, and examples thereof include resin and metal. Examples of resins include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polyacetal, and acrylonitrile-butadiene-styrene polymer (ABS).
  • the longitudinal length L11 of the housing 11 is preferably, for example, 150 mm or more and 180 mm or less.
  • the circuit section 15 is connected to the driving section 12, the power supply 14 and the switch 20.
  • the electric toothbrush 1 starts supplying power from the power supply 14 to the drive unit 12 and the circuit unit 15 or stops supplying power from the power supply 14 to the drive unit 12 and the circuit unit 15 by operating the switch 20 .
  • the drive unit 12 applies vibration to the shaft 18 by power supply from the power supply 14 connected via the circuit unit 15 .
  • Examples of the drive unit 12 include a motor that vibrates the shaft 18 in a rotational direction about an axis extending in the longitudinal direction (see, for example, Patent Documents 1 and 2 described above).
  • the drive unit 12 may be an eccentric motor. When using an eccentric motor, the direction of vibration transmitted to the replacement brush body 30 is not controlled.
  • the drive unit 12 is preferably a motor that vibrates the shaft 18 in the rotational direction. The present invention is suitable for transmitting directionally controlled vibrations to an object to be cleaned.
  • the power supply 14 of this embodiment is a DC power supply.
  • a dry battery, a button battery, a rechargeable battery, or the like can be selected.
  • the power source of the present invention is not limited to this, and a DC power source outside the housing 11 may be used as the power source.
  • the replacement brush body 30 has a base portion 31 and a brush portion 38 .
  • Symbol P in the drawing indicates the center of gravity of the replacement brush body 30 .
  • the base portion 31 is a molded body in which a base rear end portion 32, a neck portion 34, and a head portion 36 are integrally formed. From the main body 10 side, the base rear end portion 32, the neck portion 34, and the head portion 36 are formed in this order.
  • the brush portion 38 is composed of one or more hair tufts 39 provided on the head portion 36 .
  • the rear end portion 32 of the base body is a portion close to the main body 10 .
  • the rear end portion 32 of the base body has a substantially truncated cone whose diameter is gradually reduced so as to narrow from the rear end toward the tip.
  • the neck portion 34 extends from the tip of the base rear end portion 32 toward the tip of the base portion 31 .
  • the neck portion 34 is gradually tapered and narrowed from the rear end to the front end.
  • the boundary between the base rear end portion 32 and the neck portion 34 is an inflection point of the curve extending from the base rear end portion 32 to the neck portion 34 .
  • the head portion 36 is connected to the tip of the neck portion 34 .
  • the head portion 36 When viewed from the front, the head portion 36 has a substantially rectangular shape that is wider than the tip of the neck portion 34 .
  • the head portion 36 is a quadrangle whose longitudinal direction is the direction from the rear end to the front end, but the shape of the head portion 36 is not limited to this.
  • a boundary between the neck portion 34 and the head portion 36 is an inflection point of the curve extending from the neck portion 34 to the head portion 36 .
  • a hollow portion 40 is formed inside the base portion 31 .
  • the hollow portion 40 is open at the rear end of the base portion 31 . This opening is the rear end of the cavity 40 .
  • the hollow portion 40 extends from the rear end of the base portion 31 (that is, the rear end of the replaceable brush body) to the vicinity of the head portion 36 .
  • a fitting portion 42 is formed in the hollow portion 40 . Cavity 40 receives shaft 18 and fits shaft 18 into fitting 42 .
  • the fitting portion 42 may be a member that is fitted with the shaft 18 , and may be, for example, a projection projecting into the hollow portion 40 or a reduced diameter portion of the hollow portion 40 .
  • the lower limit of the length from the rear end to the tip of the base portion 31 (that is, the length of the replaceable brush body) L31 is, for example, preferably 60 mm or more, more preferably 65 mm or more, and even more preferably 70 mm or more.
  • the upper limit of the length L31 of the base portion 31 is preferably 100 mm or less, more preferably 95 mm or less, and even more preferably 90 mm or less. If the length L31 of the base portion 31 is within the above range, the replacement brush body 30 can be vibrated more efficiently, and the feeling of cleaning can be enhanced.
  • the lower limit of the width W36 of the head portion 36 in front view is preferably 7.5 mm or more, more preferably 8.5 mm or more, and even more preferably 10.0 mm or more.
  • the upper limit of the width W36 of the head portion 36 is preferably 15.0 mm or less, for example. If the width W36 of the head portion 36 is equal to or greater than the lower limit value, the mass of the head portion 36 is increased, and vibration is more stable. If the width W36 of the head portion 36 is equal to or less than the upper limit value, the mass of the head portion 36 is moderately suppressed, the vibration of the head portion 36 is not attenuated, and the replacement brush body 30 can vibrate more efficiently. Cleaning experience can be enhanced.
  • the width W36 is the length of the widest part of the head portion 36 when viewed from the front.
  • the thickness T36 of the head portion 36 is 2.5 mm or more, preferably 2.8 mm or more.
  • the upper limit of the thickness T36 of the head portion 36 is, for example, 3.5 mm or less, preferably 3.3 mm or less. If the thickness T36 of the head portion 36 is equal to or greater than the above lower limit value, the strength of the head portion 36 can be increased. If the thickness T36 of the head portion 36 is equal to or less than the above upper limit value, operability can be enhanced.
  • the lower limit of the length L36 of the head portion 36 is preferably 18 mm or longer, more preferably 20 mm or longer, and even more preferably 24 mm or longer.
  • the upper limit of the length L36 of the head portion 36 is preferably 38 mm or less, more preferably 35 mm or less, and even more preferably 32 mm or less. If the length L36 of the head portion 36 is equal to or greater than the above lower limit value, the mass of the head portion 36 increases, and vibration becomes more stable. If the length L36 of the head portion 36 is equal to or less than the upper limit value, the mass of the head portion 36 is moderately suppressed, and the center of gravity P does not come too close to the tip. Cleaning experience can be enhanced.
  • the lower limit of the length L34 from the tip of the base rear end portion 32 (base end of the neck portion 34) to the tip of the neck portion 34 is preferably 30 mm or more, more preferably 35 mm or more. , more preferably 40 mm or more.
  • the upper limit of the length L34 of the neck portion 34 is preferably 65 mm or less, more preferably 60 mm or less, and even more preferably 55 mm or less. If the length L34 of the neck portion 34 is equal to or greater than the above lower limit value, the back side of the neck portion 34 can be cleaned without being inserted into the oral cavity, thereby further enhancing operability. If the length L34 of the neck portion 34 is equal to or less than the above upper limit value, the distance between the position where the main body 10 is gripped and the head portion 36 becomes closer, and the operability can be further enhanced.
  • the lower limit of the length L32 from the rear end of the base portion 31 to the boundary between the neck portion 34 and the head portion 36 is, for example, 40 mm or more is preferable, 45 mm or more is more preferable, and 50 mm or more is even more preferable.
  • the upper limit of the length L32 is preferably 65 mm or less, more preferably 60 mm or less. If the length L32 is equal to or greater than the lower limit, the back side of the neck portion 34 will not be inserted into the oral cavity during cleaning, thereby enhancing operability. If the length L34 is equal to or less than the upper limit, the distance between the position where the main body 10 is gripped and the head portion 36 becomes short, and operability can be further enhanced.
  • a minimum width (minimum width) W34 of the neck portion 34 in a front view is, for example, preferably 3.0 mm or more, more preferably 3.5 mm or more, and even more preferably 3.8 mm or more.
  • the upper limit of the minimum width W34 of the neck portion 34 is, for example, preferably 6.5 mm, more preferably 5.0 mm or less, and even more preferably 4.5 mm or less. If the minimum width W34 of the neck portion 34 is equal to or greater than the above lower limit, the strength of the neck portion 34 can be further enhanced. If the minimum width W34 of the neck portion 34 is equal to or less than the upper limit value, operability can be further enhanced.
  • the position of the minimum width W34 in the neck portion 34 is the boundary between the neck portion 34 and the head portion 36. As shown in FIG.
  • the cross section of the neck portion 34 may be circular, elliptical, or polygonal.
  • the minimum thickness T34 of the neck portion 34 is the same as the width W34.
  • the minimum thickness T34 of neck portion 34 may be the same as or different from width W34.
  • the lower limit of the ratio of the width W36 of the head portion 36 to the minimum width W34 of the neck portion 34 is, for example, preferably 1.2 times or more, more preferably 1.4 times or more, and 1.7. More preferably twice or more.
  • the upper limit of the W36/W34 ratio is preferably 5.0 times or less, more preferably 4.3 times or less. If the W36/W34 ratio is equal to or higher than the lower limit, the mass of the head portion 36 increases, and vibration becomes more stable. If the W36/W34 ratio is equal to or less than the upper limit, the vibration is stably transmitted from the neck portion 34 to the head portion 36, and the replacement brush body 30 can vibrate more efficiently.
  • the lower limit of the distance between the position of the width W36 of the head portion 36 and the position of the minimum width W34 of the neck portion 34 is, for example, preferably 3.5 mm or more, more preferably 3.8 mm or more, and further preferably 4.0 mm or more. preferable.
  • the upper limit of the distance between the position of the width W36 and the position of the width W34 is, for example, preferably 30.0 mm or less, more preferably 25.0 mm or less, and even more preferably 20.0 mm or less. If the distance between the position of the width W36 and the position of the width W34 is equal to or greater than the lower limit, the center of gravity P can be more easily positioned on the tip side, and the replacement brush body 30 can vibrate more efficiently.
  • the replacement brush body 30 can be vibrated effectively.
  • the position of the width W36 of the head portion 36 is the position closest to the rear end among the widest points in the front view.
  • the position of the minimum width W34 of the neck portion 34 is the position closest to the tip among the narrowest points in front view.
  • the distance between the position of the width W36 and the position of the width W34 is the distance in the major axis direction of the replacement brush body 30 .
  • the lower limit value of the width W31 of the rear end of the base portion 31 in front view is, for example, preferably 8 mm or more, more preferably 10 mm or more, and even more preferably 12 mm or more.
  • the upper limit of the width W31 is preferably 20 mm or less, for example. If the width W31 of the rear end of the base portion 31 is equal to or greater than the above lower limit value, the shaft 18 and the replaceable brush body 30 are connected more firmly, and the vibration can be efficiently transmitted by the replaceable brush body 30 . If the width W31 of the rear end of the base portion 31 is equal to or less than the upper limit, the center of gravity P of the replaceable brush body 30 can be more easily positioned toward the tip side, and the replaceable brush body 30 can vibrate more efficiently. Cleaning experience can be enhanced.
  • the ratio of the width W36 of the head portion 36 to the width W31 of the rear end of the base portion 31 is, for example, preferably 39% or more, more preferably 43% or more, and even more preferably 50% or more.
  • the upper limit of the W36/W31 ratio is, for example, preferably 200% or less, more preferably 150% or less, and even more preferably 100% or less. If the W36/W31 ratio is equal to or higher than the lower limit, the mass of the head portion 36 increases, and vibration becomes more stable.
  • the W36/W31 ratio is equal to or less than the upper limit, the fitting force between the replaceable brush body 30 and the shaft 18 is improved, and the mass of the head portion 36 is not excessively increased, so that vibration is not damped. , the replacement brush body 30 vibrates more efficiently, and the feeling of cleaning can be enhanced. Note that the ratios described in this specification are percentages.
  • the ratio of the minimum width W34 of the neck portion 34 to the width W31 of the rear end of the base portion 31 is, for example, preferably 15% or more, more preferably 17.5% or more.
  • the upper limit of the W34/W31 ratio is, for example, preferably 65% or less, more preferably 50% or less, and even more preferably 45% or less. If the W34/W31 ratio is equal to or greater than the lower limit, the center of gravity P is positioned closer to the tip, and vibration is more stable. If the W34/W31 ratio is equal to or less than the upper limit, the fitting force between the replaceable brush body 30 and the shaft 18 is improved, and the mass of the tip of the head portion 36 and the neck portion 34 is not excessively increased. The vibration is not attenuated, the replacement brush body 30 vibrates more efficiently, and the feeling of cleaning can be enhanced.
  • the ratio (S34/S31 ratio) of the cross-sectional area S34 (cross section perpendicular to the long axis direction) of the tip of the neck portion 34 to the cross-sectional area S31 (cross section perpendicular to the long axis direction) of the rear end of the base portion 31 is 2. % or more is preferable, and 3% or more is more preferable.
  • the upper limit of the S34/S31 ratio is preferably 43% or less, more preferably 25% or less, and even more preferably 22% or less. If the S34/S31 ratio is equal to or greater than the lower limit, the center of gravity P is positioned closer to the tip, and vibration is more stable.
  • the fitting force between the replaceable brush body 30 and the shaft 18 is improved, and the mass of the tip of the head portion 36 and the neck portion 34 is not excessively increased.
  • the vibration is not attenuated, the replacement brush body 30 vibrates more efficiently, and the feeling of cleaning can be enhanced.
  • the length L40 of the hollow portion 40 is preferably 20 mm or more, for example.
  • the upper limit of the length L40 of the hollow portion 40 is more preferably 45 mm or less, for example. If the length L40 of the hollow portion 40 is equal to or greater than the above lower limit, the weight of the base portion 31 near the rear end can be reduced, and the center of gravity of the replaceable brush body 30 can be easily adjusted toward the front end. If the length L40 of the hollow portion 40 is equal to or less than the above upper limit, a dense portion (a portion in which no hollow is formed) is appropriately secured, and the weight of the replaceable brush body 30 near the tip is made heavier than that near the rear end. Therefore, the center of gravity of the replacement brush body 30 can be easily adjusted toward the tip.
  • the tip of the hollow portion 40 is preferably located in a region of 10 mm or more and 65 mm or less from the tip of the neck portion 34 toward the rear end.
  • the ratio of the length L40 of the hollow portion 40 to the length L32 from the rear end of the base portion 31 to the boundary between the neck portion 34 and the head portion 36 is, for example, preferably 35% or more, and 40%. 46% or more is more preferable.
  • the upper limit of the L40/L32 ratio is preferably 95% or less, more preferably 85% or less. If the L40/L32 ratio is equal to or higher than the lower limit, the weight of the base portion 31 near the rear end can be reduced, and the center of gravity of the replaceable brush body 30 can be easily adjusted toward the front end. If the L40/L32 ratio is equal to or less than the upper limit, the center of gravity of the replaceable brush body 30 can be easily adjusted toward the tip by making the base portion 31 closer to the tip the weight.
  • the ratio of the length L40 of the hollow portion 40 to the length L31 of the base portion 31 is, for example, preferably 20% or more, more preferably 23.5% or more, and even more preferably 35% or more.
  • the upper limit of the L40/L31 ratio is preferably 73% or less, more preferably 65% or less. If the L40/L31 ratio is equal to or greater than the lower limit, the weight of the base portion 31 near the rear end can be reduced, and the center of gravity of the replaceable brush body 30 can be easily adjusted toward the front end. If the L40/L31 ratio is equal to or less than the upper limit, the center of gravity of the replaceable brush body 30 can be easily adjusted toward the tip by making the base portion 31 closer to the tip the weight.
  • the thickness T40 of the base portion 31 in the hollow portion 40 can be appropriately determined in consideration of the position of the center of gravity P.
  • the thickness T40 of the base portion 31 in the hollow portion 40 is preferably, for example, 1.4 mm or more and 2.7 mm or less in a region extending from the rear end to the front end of the base portion 31 up to 25 mm. If the thickness T40 is equal to or greater than the lower limit, the strength of the base portion 31 is increased. If the thickness T40 is equal to or less than the upper limit value, the weight of the region near the rear end of the base portion 31 can be reduced, and the center of gravity P can be easily adjusted toward the front end.
  • the density of the base portion 31 is preferably, for example, 1.0 g/cm 3 or more and 1.6 g/cm 3 or less.
  • the replacement brush body 30 has a desired mass, vibrates more efficiently, and the feeling of cleaning can be enhanced.
  • the material of the base portion 31 is not particularly limited, and examples thereof include polyolefins such as polyethylene (PE) and polypropylene (PP), polyesters such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), polyacetal (POM), acrylonitrile- Examples include resins such as butadiene-styrene polymer (ABS). Among them, it is preferable to use POM for the base portion 31 . Since POM has a high density, the mass of the replaceable brush body 30 can be easily increased. As a result, the vibration of the replaceable brush body 30 can be further increased, and the feeling of cleaning can be further improved.
  • POM polyolefins
  • PP polypropylene
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • POM polyacetal
  • ABS butadiene-styrene polymer
  • ABS butadiene-styrene polymer
  • the position of the tip of the shaft 18 is preferably located in an arbitrary region of the base portion 31 from the rear end to the tip.
  • the lower limit of the ratio of the length L18 from the rear end of the replaceable brush body 30 to the tip of the shaft 18 to the length L31 of the base portion 31 is preferably 15.8% or more, for example. 17.0% or more is more preferable, and 20.0% or more is even more preferable.
  • the upper limit of the L18/L31 ratio is preferably 30.8% or less, more preferably 28.5% or less, and even more preferably 26.7% or less.
  • the L18/L31 ratio is equal to or greater than the lower limit, a sufficient amount of insertion of the shaft 18 into the base portion 31 can be ensured, and the shaft 18 and the replacement brush body 30 can be connected more firmly. It is stably transmitted to the replacement brush body 30, and the feeling of cleaning can be further enhanced. If the L18/L31 ratio is equal to or less than the upper limit, the mass of the rear end side of the base portion 31 is reduced, the center of gravity P can be more easily positioned on the front end side, and the replacement brush body 30 can be moved more efficiently. It vibrates and enhances the feeling of cleaning.
  • the lower limit of the length L18 from the rear end of the replacement brush body 30 to the tip of the shaft 18 is, for example, preferably 10 mm or more, more preferably 15 mm or more, and even more preferably 17 mm or more.
  • the upper limit of the length L18 is preferably 20 mm or less, for example. If the length L18 is equal to or greater than the lower limit, the shaft 18 and the replaceable brush body 30 can be connected more firmly, so that the vibration generated in the driving section 12 is stably transmitted to the replaceable brush body 30. If the length L18 is equal to or less than the upper limit, the center of gravity P can be more easily positioned on the tip side, the replacement brush body 30 can vibrate more efficiently, and the feeling of cleaning can be enhanced.
  • the lower limit of the distance L18a from the tip of the shaft 18 to the tip of the hollow portion 40 is preferably 5 mm or more, more preferably 10 mm or more.
  • the upper limit of the distance L18a is preferably 45 mm or less, more preferably 35 mm or less. If the distance L18a is equal to or greater than the lower limit, a sufficient amount of insertion of the shaft 18 into the base portion 31 can be ensured, and the shaft 18 and the replacement brush body 30 can be connected more firmly. The vibration is stably transmitted to the replacement brush body 30, and the feeling of cleaning can be enhanced.
  • the dense portion of the neck portion 34 (the portion where the hollow portion 40 is not formed) is appropriately long, and the mass of the tip region of the replaceable brush body 30 is ensured.
  • the replacement brush body 30 can be vibrated more efficiently.
  • the length L31 is 65 mm or more and 95 mm or less (length L36 : 20 mm or more and 30 mm or less, length L32: 45 mm or more and 65 mm or less), length L18 is preferably 15 mm or more and 20 mm or less, and length L31 is 70 mm or more and 85 mm or less (length L36: 20 mm, length L32 : 50 mm or more and 65 mm or less), the length L18 is more preferably 15 mm or more and 20 mm or less, and the length L31 is 75 mm or more and 85 mm or less (length L36: 20 mm, length L32: 55 mm or more and 65 mm or less), More preferably, the length L18 is 17 mm or more and 20 mm or less.
  • the thickness T36 of the head portion 36 is 2.8 mm or more and 3.2 mm or less
  • the mass of the replacement brush body 30 is 4 g or more and 5 g or less
  • the width W36 of the head portion 36 is 11.5 mm or more. 12.5 mm or less.
  • the brush part 38 is an assembly of one or more hair bundles 39 .
  • the tufts 39 rise from one surface (flocking surface) 37 of the head portion 36 .
  • the number of hair bundles 39 in the brush part 38 is not particularly limited, and is set to 1 or more and 90 or less, for example.
  • the hair bundle 39 is a bundle of a plurality of hairs.
  • the number of hairs constituting the hair bundle 39 is not particularly limited, and is set to 10 or more and 350 or less, for example.
  • the thickness (width) of the proximal end of the hair bundle 39 is preferably 1.0 mm or more and 3.0 mm or less, for example.
  • bristles common bristles used for toothbrushes can be used.
  • bristles include straight bristles having substantially the same thickness from the base end to the tip, tapered bristles with sharpened bristles, and branched bristles with branched bristles at the tip.
  • Materials for the bristles include polyolefin, polyamide, polyester and the like.
  • the length of the bristles is not particularly limited, and is preferably 5 mm or more and 20 mm or less, for example.
  • the thickness of the bristles is not particularly limited, and is preferably 4 mil or more and 10 mil or less. Note that 1 mil is 0.0254 mm.
  • a columnar object that is an injection-molded body of soft resin may be used instead of the hair bundles 39.
  • the soft resin include elastomer resins such as polyolefin-based elastomers, styrene-based elastomers, polyester-based elastomers, polyurethane-based elastomers, and silicone resins.
  • the lower limit of the mass of the replacement brush body 30 is 3.0 g or more, preferably 3.5 g or more.
  • the upper limit of the mass of the replacement brush body 30 is 7.0 g or less, preferably 5.5 g or less. If the mass of the replaceable brush body 30 is within the above range, the replaceable brush body 30 vibrates more efficiently.
  • the center of gravity P is preferably located at the neck portion 34 and located near the head portion 36 .
  • a distance LP1 from the tip of the replacement brush body 30 to the center of gravity P of the replacement brush body 30 is preferably 20 mm or more and 50 mm or less. If the distance LP1 is within the above range, the replacement brush body 30 vibrates more efficiently.
  • the upper limit of the ratio of the distance LP1 from the tip of the replacement brush body 30 to the center of gravity P of the replacement brush body 30 to the length L31 of the replacement brush body 30 is 70.0% or less. 58.8% or less is preferable, and 55.0% or less is more preferable.
  • the lower limit of the LP1/L31 ratio is preferably 35.3% or more, more preferably 38.0% or more.
  • the center of gravity P can be brought closer to a desired position.
  • the position of the center of gravity P can be adjusted by a combination of the mass of the replaceable brush body 30, the length of the hollow portion 40, the size of the head portion 36, the material of the base portion 31, T34 of the wall of the hollow portion 40, and the like.
  • the center of gravity P is preferably positioned near the tip of the hollow portion 40 . More preferably, the center of gravity P is positioned closer to the head section 36 than the tip of the hollow section 40 . That is, the lower limit value of the ratio of the distance LP2 from the rear end of the base portion 31 to the center of gravity P (LP2/L40 ratio) with respect to the length L40 of the hollow portion 40 is preferably 85% or more, and more preferably 100% or more. Preferably, more than 100% is more preferable, and 120% or more is particularly preferable. For example, the upper limit of the LP2/L40 ratio is preferably 155% or less, more preferably 140% or less.
  • the center of gravity P is brought closer to the head portion 36, and the replaceable brush body 30 vibrates efficiently. If the LP2/L40 ratio is equal to or less than the upper limit, the center of gravity P is not located on the tip side of the cavity 40 more than necessary, and the vibration is not attenuated on the tip side of the cavity 40. The replacement brush body 30 vibrates to enhance the feeling of cleaning.
  • the center of gravity P suspends the replacement brush body 30 at any two points, obtains each image, and draws a perpendicular line on the obtained image. Then, by image processing, the replacement brush bodies 30 of the two images are overlapped, and the intersection point of the two perpendicular lines is set as the center of gravity P. Description will be made below with reference to FIGS. 3(a) to 3(c).
  • a string 50 is attached to an arbitrary point, and the replacement brush body 30 is suspended by the string 50 .
  • a string 50 is attached to the rear end of the replacement brush body 30 to suspend the replacement brush body 30 .
  • a perpendicular line Q1 passing through the point of contact between the string 50 and the replaceable brush body 30 is drawn (step 1).
  • a string 50 is attached to another arbitrary point, and the replacement brush body 30 is suspended by the string 50.
  • a string 50 is attached to the tip of the replaceable brush body 30 to suspend the replaceable brush body 30 .
  • a perpendicular line Q2 passing through the point of contact between the cord 50 and the replaceable brush body 30 is drawn (step 2).
  • the images obtained in steps 1 and 2 are superimposed.
  • the replacement brush body 30 is stacked. Let the center of gravity P be the intersection of the perpendicular line Q1 and the perpendicular line Q2 in a state where the replacement brush bodies 30 are superimposed.
  • the action mechanism of the electric toothbrush 1 will be described.
  • the switch 20 is pressed to supply power to the circuit section 15 and the drive section 12 .
  • the motion of the drive portion 12 is transmitted to the base portion 31 via the shaft 18, causing the base portion 31 to vibrate.
  • the center of gravity P is at a specific position (closer to the tip)
  • the head portion 36 positioned at the tip vibrates more.
  • the vibration of the head portion 36 is transmitted from the hair bundles 39 of the brush portion 38 to the oral cavity. Since the vibration transmitted from the hair tufts 39 is large, the cleaning power for teeth, gums, etc. is enhanced, and the feeling of cleaning is enhanced.
  • the lower limit of the frequency of the head portion 36 during use of the electric toothbrush 1 is preferably 15000 rpm or higher, more preferably 18000 rpm or higher, and even more preferably 20000 rpm or higher.
  • the upper limit of the vibration frequency of the head portion 36 is preferably 50000 rpm or less, more preferably 48000 rpm or less, and even more preferably 45000 rpm or less. If the vibration frequency of the head portion 36 is equal to or higher than the lower limit value, the feeling of cleaning can be enhanced. If the frequency is equal to or less than the above upper limit, excessive stimulation can be reduced.
  • the frequency of the head section 36 can be adjusted by combining the design of the circuit section 15 and the specification of the driving section 12 .
  • the frequencies of the head portion 36 described herein are values measured using a stroboscope.
  • a stroboscope is a device that emits flashes of light at regular intervals.
  • the vibrating head portion 36 is irradiated with flashing light from a stroboscope.
  • the flashing speed (times/minute) of the light emitted from the stroboscope is increased.
  • the flickering speed when the vibrating head portion 36 appears to stop is defined as the frequency.
  • the mass of the replacement brush body 30 is preferably 3.0 g or more and 4.0 g or less.
  • the mass of the replacement brush body 30 is preferably 3.5 g or more and 5.5 g or less.
  • the mass of the replacement brush body 30 is preferably 5.0 g or more and 7.0 g or less.
  • the electric toothbrush of the present embodiment since it has a replacement brush body having a specific mass and a center of gravity at a specific position, it has excellent operability and a good feeling of cleaning.
  • the base portion has the base rear end portion
  • the base portion may have a neck portion and a head portion.
  • the rear end of the housing has a detachable lid
  • the present invention is not limited to this, and the lid at the rear end of the housing The body does not have to be removable.
  • a base portion (POM or ABS) of a replaceable brush body was produced according to the specifications shown in Tables 1 and 2 below.
  • the tip of the neck portion (minimum width position) of the obtained base portion was a perfect circle.
  • the rear end of the obtained base portion was a perfect circle with a diameter of 20 mm.
  • tufts (thickness: 1.2 mm) consisting of 30 bristles (polyamide, bristle length: 10 mm, thickness: 6 mil) are provided in 4 columns x 7 rows, and the replacement brushes for each example are provided.
  • FIG. 4(a) is a photograph of the head section observed from the tip direction in a state (static state) in which the driving section is not operated. In a stationary state, the flocked surface 37 maintained a constant surface. Next, the head portion was observed from the tip direction while the driving portion was operated (vibrating state) (FIG. 4(b)). As shown in FIG.
  • the flocked surface 37 in the vibrating state, is alternately inclined in the front direction and the back direction on both sides in the width direction of the head part 36 with the longitudinal direction of the replaceable brush body as the axis O. . That is, in the vibrating state, the flocked surface 37 alternately repeats the state of the flocked surface 37a inclined in one direction in the width direction and the state of the flocked surface 37b inclined in the other direction.
  • the angle ⁇ formed by the flocked surface 37a and the flocked surface 37b was defined as the swing angle of the head portion.
  • Examples 1 to 12, to which the present invention was applied scored 4.3 points or more for actual cleaning and 4.1 points or more for operability.
  • Comparative Example 1 in which the mass of the replaceable brush body was 7.3 g, and Comparative Example 2, in which the mass of the replaceable brush body was 2.8 g, received 3.0 points or less in cleaning feeling and 3.6 points in operability. rice field.
  • Comparative Example 3 with an LP1/L31 ratio of 77.0% and Comparative Example 4 with an LP1/L31 ratio of 33.0% scored 4.5 points or less for actual cleaning and 3.5 points or less for operability. rice field. From these results, it was confirmed that the application of the present invention can enhance the feeling of cleaning and the operability.

Landscapes

  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Epidemiology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Brushes (AREA)

Abstract

Une brosse à dents selon la présente invention comprend un corps principal (10) et un corps de brosse remplaçable (30). Le corps principal (10) comprend : une unité d'entraînement (12) qui est placée à l'intérieur de celui-ci ; et un arbre (18) qui est raccordé à l'unité d'entraînement (12) et dont l'extrémité avant fait saillie à partir de celle-ci. Le corps de brosse remplaçable (30) présente une partie col (34), une partie tête (36) qui est placée sur une extrémité avant de la partie col (34), et une partie brosse qui est placée sur une surface de la partie tête (36). Le corps de brosse remplaçable (30) est conçu pour recevoir l'extrémité avant de l'arbre (18) à l'intérieur de celui-ci de façon à être raccordé amovible à l'arbre (18). La partie tête (36) a une épaisseur de 2,5 à 3,5 mm. Le corps de brosse remplaçable (30) a une masse de 3,0 à 7,0 g. Le corps de brosse remplaçable (30) est conçu pour que son centre de gravité P se situe à l'intérieur d'une section de 35,3 à 70,0 % de la distance entre l'extrémité avant du corps de brosse remplaçable (30) et l'extrémité arrière de celui-ci.
PCT/JP2022/041335 2021-12-28 2022-11-07 Brosse à dents électrique WO2023127309A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-214802 2021-12-28
JP2021214802 2021-12-28

Publications (1)

Publication Number Publication Date
WO2023127309A1 true WO2023127309A1 (fr) 2023-07-06

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0570331U (ja) * 1992-03-02 1993-09-24 株式会社フリセッタジャパン 歯ブラシ
JP2009106355A (ja) * 2007-10-26 2009-05-21 Lion Corp 電動歯ブラシ
JP2016104231A (ja) * 2016-02-17 2016-06-09 パナソニックＩｐマネジメント株式会社 口腔衛生装置
JP2018118169A (ja) * 2016-10-28 2018-08-02 ライオン株式会社 歯ブラシ
CN111012537A (zh) * 2020-01-08 2020-04-17 深圳市莱孚实业有限公司 一种具有rfid感应功能的可智能识别牙刷头电动牙刷
CN112472344A (zh) * 2020-12-17 2021-03-12 中山智选科技有限公司 电动牙刷

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0570331U (ja) * 1992-03-02 1993-09-24 株式会社フリセッタジャパン 歯ブラシ
JP2009106355A (ja) * 2007-10-26 2009-05-21 Lion Corp 電動歯ブラシ
JP2016104231A (ja) * 2016-02-17 2016-06-09 パナソニックＩｐマネジメント株式会社 口腔衛生装置
JP2018118169A (ja) * 2016-10-28 2018-08-02 ライオン株式会社 歯ブラシ
CN111012537A (zh) * 2020-01-08 2020-04-17 深圳市莱孚实业有限公司 一种具有rfid感应功能的可智能识别牙刷头电动牙刷
CN112472344A (zh) * 2020-12-17 2021-03-12 中山智选科技有限公司 电动牙刷

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