CN216603155U - Pressure sensing module and electric toothbrush - Google Patents

Abstract

The utility model provides a pressure sensing module and an electric toothbrush, wherein the pressure sensing module comprises a substrate, a pressure sensor and a reinforcing part, a gap structure is arranged on the reinforcing part, and after the pressure sensing module is attached to a target object, the gap structure can transmit stress generated by deformation of the target object to the pressure sensor so as to detect deformation of the target object. The pressure sensing module provided by the utility model can be used for mounting on any target object, and is simple and convenient and high in detection precision.

Description

Pressure sensing module and electric toothbrush

Technical Field

The utility model relates to the technical field of household appliances, in particular to a pressure sensing module and an electric toothbrush with the same.

Background

Electric toothbrushes are increasingly accepted by the general public as having good teeth cleaning effects. The electric toothbrush has the working principle that: the linear motor is used for driving the toothbrush head to vibrate back and forth to clean teeth. When the electric toothbrush is used, the bristles which vibrate at high frequency can cause a certain degree of abrasion to gums and teeth due to overlarge pressure, and meanwhile, the toothpaste falls off or toothpaste foam splashes everywhere due to the vibration of the motor at high frequency. Therefore, the pressure of the brush needs to be detected. Currently, only a few products have pressure detection capabilities.

For example, in the solution disclosed in patent application CN104619211A, a hall sensor is used to provide continuous feedback pressure sensing for a resonant drive toothbrush. The V-shaped spring assembly is mainly used for transferring force, and when the rear end is displaced, the magnet generates a changing magnetic field, so that the Hall sensor outputs a signal to the processor to judge the pressure value. However, the electric toothbrush having the above structure has a complicated structure, which results in a sharp increase in the production cost of the electric toothbrush, and has a large size, which is not easy to carry.

Therefore, how to design an electric toothbrush with a simple structure and capable of effectively detecting pressure becomes a technical problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve at least one technical problem in the prior art, and provides a pressure sensing module and an electric toothbrush with the same.

The purpose of the utility model is realized by adopting the following technical scheme:

according to an aspect of the present invention, there is provided a pressure sensing module, including: a substrate having opposing first and second surfaces; a pressure sensor fixedly connected to the first surface of the substrate; a reinforcement member disposed on the second surface of the substrate, and a projection of the reinforcement member on the substrate at least partially overlaps a projection of the pressure sensor on the substrate; the reinforcing part is provided with a gap structure, and after the pressure sensing module is attached to a target object, the gap structure can transmit stress generated by deformation of the target object to the pressure sensor.

Optionally, the slot structure comprises at least one slot.

Optionally, the reinforcing member is a reinforcing plate, and each slit at least partially penetrates the reinforcing plate in the first extending direction of the base.

Optionally, the sum of the cross-sectional widths of all the slits in the slit structure in a second extending direction perpendicular to the first extending direction is less than or equal to 90% of the width of the reinforcing plate in that direction.

Optionally, each of the slits penetrates the reinforcing plate in a thickness direction of the reinforcing plate.

Alternatively, each of the slits may only partially penetrate the reinforcing plate in the thickness direction of the reinforcing plate.

Optionally, for each slit, the opening direction thereof is towards the second surface of the substrate or away from the second surface of the substrate.

Optionally, for each slit, a thickness of the non-penetrated portion of the reinforcing plate is less than or equal to 90% of a thickness of the reinforcing plate.

Optionally, the at least one slit has the same depth or different depths.

Optionally, the slit structure includes a first set of slits and a second set of slits, the first set of slits includes at least one slit, and each slit of the first set of slits penetrates the stiffener in a thickness direction of the stiffener, the second set of slits includes at least one slit, and each slit of the second set of slits only partially penetrates the stiffener in the thickness direction of the stiffener.

Optionally, for each slit in the second set of slits, the opening direction thereof is towards the second surface of the substrate or away from the second surface of the substrate.

Optionally, each slit of the first set of slits and each slit of the second set of slits do not intersect each other.

Optionally, the first group of slits and the second group of slits are arranged in a staggered manner.

Optionally, the second set of slits have the same depth or different depths.

Optionally, each slit in the slit structure has a cross-sectional shape of any one of a V-shape, an arc shape, and a rectangle.

Optionally, a width of each of the slits is greater than 10 μm and smaller than a width of the pressure sensor in the second extending direction.

Optionally, the reinforcing member is made of any one or a combination of metal, ceramic or carbon fiber materials.

Optionally, the pressure sensor is fixedly connected with the substrate via a welded structure.

Optionally, the reinforcing component is fixedly connected with the substrate through an adhesive, wherein the hardness value of the adhesive after curing reaches Shore D.

Optionally, the reinforcing member is integrally formed with the base. According to another aspect of the present invention, there is also provided an electric toothbrush comprising any one of the pressure sensing modules described above.

Optionally, the electric toothbrush further comprises a toothbrush rod, and the pressure sensing module is disposed on a platform on one side of the toothbrush rod, wherein the platform is located at a front or middle portion of the toothbrush rod.

Optionally, the pressure sensing module is fixedly connected with the platform through an adhesive, and the hardness value of the adhesive after curing reaches shore D.

The pressure sensing module and the electric toothbrush provided by the embodiment of the utility model are used for solving the problems of complex structure and insufficient detection precision of electric toothbrush pressure detection in the prior art, wherein the pressure sensing module comprises a substrate, a pressure sensor and a reinforcing part, and the reinforcing part is provided with a gap structure.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other embodiments based on these drawings without creative efforts.

Fig. 1A is a schematic perspective view of a pressure sensing module according to an embodiment of the present invention;

FIG. 1B is a schematic cross-sectional view taken along line I-I' of FIG. 1A;

fig. 2 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the present invention;

fig. 3 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 4 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the present invention;

fig. 5 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 6 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the present invention;

fig. 7 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 8 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 9 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 10 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

fig. 11 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model;

FIG. 12A is a schematic view of a portion of a powered toothbrush provided in accordance with an embodiment of the present invention;

fig. 12B is a schematic view of a portion of an electric toothbrush according to yet another embodiment of the present invention.

Detailed Description

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Fig. 1A is a schematic perspective view of a pressure sensing module according to an embodiment of the present invention, and fig. 1B is a schematic cross-sectional view taken along I-I' in fig. 1A. Referring to fig. 1A-1B, the present invention relates to a pressure sensing module 10, wherein the pressure sensing module 10 includes: a substrate 3, the substrate 3 having a first surface 3a and a second surface 3b opposite to each other in a thickness direction; the pressure sensor 1, the said pressure sensor 1 is fixedly connected with said first surface 3a of the said base 3; a reinforcing member 2, the reinforcing member 2 being disposed on the second surface 3b of the substrate 3, and a projection of the reinforcing member 2 on the substrate 3 at least partially overlapping a projection of the pressure sensor 1 on the substrate 3; the reinforcing member 2 is provided with a gap structure 4, and after the pressure sensing module 10 is attached to the target object, the gap structure 4 can transmit the stress generated by the deformation of the target object to the pressure sensor 1.

It should be noted that the pressure sensor 1 includes at least one pressure sensor chip, such as a MEMS (Micro-Electro-Mechanical System) chip, and the pressure sensor chip includes at least one stress sensing resistor thereon, and each stress sensing resistor includes two electrodes and a sensing material located between the two electrodes. The stress-sensing resistors on the pressure sensor chip are a part of a wheatstone bridge, and of course, four resistors required by the wheatstone bridge may be provided, for example, 2 stress-sensing resistors and 2 reference resistors are provided in the pressure sensor chip, and the four resistors form the wheatstone bridge and are used for detecting deformation of the upper surface or the lower surface film of the pressure sensor 1, so as to calculate the deformation amount of the target object to be measured.

According to the pressure sensing module 10 provided by the utility model, after the pressure sensing module 10 is attached to a target object, when the target object to be detected deforms or bends, the slit structure 4 arranged in the reinforcing part 2 generates stress concentration, the stress concentration can drive the substrate 3 to deform, and further force is transmitted to the upper surface film or the lower surface film of the pressure sensor 1, after the stress of the upper surface film or the lower surface film of the pressure sensor 1 is sensed through the Wheatstone bridge arranged on the pressure sensor 1, a corresponding electric signal can be output, and the pressure sensing module 10 achieves the effect of detecting the deformation of the target object by virtue of the stress concentration phenomenon of the slit structure 4 in the reinforcing part 2. Compared with a mode that a groove or a notch and other structures are arranged on a detected target object to serve as a stress trigger piece (stress concentration is generated at the position), and a stress detection piece is mounted at the groove or notch and other structure positions to detect stress corresponding to deformation, the pressure sensing module provided by the utility model does not need to arrange an additional stress trigger piece on the detected target object, can be mounted on any target object for use, and is simple, convenient and high in detection precision.

Alternatively, the base 3 may be a Flexible substrate such as a Flexible Printed Circuit (FPC), or the base 3 may be a rigid substrate such as a rigid Circuit Board (PCB). On said first surface 3a of said substrate 3 there may be provided a conductive layer and corresponding electronic circuitry, and conductive pads on the pressure sensor 1 are soldered to corresponding electrical connection terminals on said first surface 3a of said substrate 3 by means of a soldering structure (not shown) to enable communication of electrical signals with external electrical devices. Alternatively, the soldering structure is a solder layer or a solder ball, etc.

Optionally, the thickness of the reinforcing member 2 is greater than or equal to the thickness of the pressure sensor 1, the reinforcing member 2 is made of any one or a combination of metal, ceramic or carbon fiber materials, the reinforcing member 2 is made of a hard material such as metal, ceramic or carbon fiber material, which not only has a reinforcing effect and prevents the hard material from supporting the substrate 3, but also can transmit the force to the MEMS chip without loss as much as possible from the stress concentration position because the hard material such as metal, ceramic or carbon fiber material does not absorb the stress itself, and if the reinforcing member 2 is a soft material such as glue, the force can be absorbed from the stress concentration position instead, which affects the transmission of the force and affects the sensitivity of the stress sensing. In some embodiments, the reinforcing component 2 is fixedly connected to the substrate 3 by an adhesive, wherein the cured hardness value of the adhesive reaches shore D scale. The adhesive of the shore D grade is also used to reduce the loss of force transmission at the stress concentration as much as possible, and to transmit the force from the stress concentration to the MEMS chip more accurately. In other embodiments, the reinforcing member 2 and the substrate 3 are integrally formed, for example, a PCB board with a soft and hard combination, and the reinforcing member 2 and the substrate 3 can be integrated together.

Specifically, the slit structure 4 of the reinforcing member 2 may be formed by laser cutting or mechanical cutting, or may be formed by die stamping. The utility model is not limited thereto.

Illustratively, with continued reference to fig. 1, the reinforcing member 2 is a reinforcing plate 21, the reinforcing plate 21 is a rectangular block, and each slit 40 at least partially penetrates the reinforcing plate 21 in a first extending direction (indicated by x in fig. 1A) of the base 3. It should be understood that the reinforcing component 2 may also be a reinforcing layer, i.e. a corresponding reinforcing film layer is disposed on the second surface 3b of the substrate 3 to reinforce the substrate 3.

Optionally, the sum of the cross-sectional widths w of all the slits 40 in the slit structure 4 in a second extending direction (indicated by y in fig. 1A) perpendicular to the first extending direction (indicated by x in fig. 1A) is less than or equal to 90% of the width of the reinforcing plate 21 in that direction.

The slit structure 4 may completely penetrate the reinforcing member 2 in the thickness direction of the reinforcing member 2, may only partially penetrate the reinforcing member 2, or may be a combination of both. The three embodiments will be described in detail below with reference to the accompanying drawings.

First embodiment

Each slit in the slit structure 4 completely penetrates the reinforcing member 2 in the thickness direction of the reinforcing member 2.

As shown in fig. 1B and fig. 2, the gap structure 4 includes at least one gap 40, and each gap 40 may completely penetrate through the reinforcing plate 21 in the thickness direction of the reinforcing plate 21.

Set up a plurality of gaps 40 that run through stiffening plate 21 in stiffening plate 21, after being surveyed the target object and take place deformation and bending, a plurality of gaps 40 that set up in stiffening plate 21 will produce stress concentration and stack, and stress concentration after this stack can drive basement 3 and take place to warp, and then will exert oneself and transmit pressure sensor 1's upper surface membrane or lower surface membrane, feel pressure sensor 1's upper surface membrane or lower surface membrane's stress through the wheatstone bridge that sets up on pressure sensor 1 after, can output corresponding signal of telecommunication, with the help of the stress concentration phenomenon that a plurality of gaps 40 in stiffening plate 21 produced makes this pressure sensing module 10 reach the effect of detection dynamics.

Second embodiment

Each slit in the slit structure 4 penetrates the reinforcing member 2 only partially in the thickness direction of the reinforcing member 2.

Fig. 3 is a schematic cross-sectional structure diagram of a pressure sensing module according to yet another embodiment of the present invention, fig. 4 is a schematic cross-sectional structure diagram of a pressure sensing module according to yet another embodiment of the present invention, fig. 5 is a schematic cross-sectional structure diagram of a pressure sensing module according to yet another embodiment of the present invention, and fig. 6 is a schematic cross-sectional structure diagram of a pressure sensing module according to yet another embodiment of the present invention.

Illustratively, as shown in fig. 3 to 6, the reinforcing member 2 is a reinforcing plate 21, the reinforcing plate 21 is a rectangular block, the slit structure 4 includes at least one slit 41/42 along the thickness direction of the reinforcing plate 21, each slit 41/42 penetrates only a part of the reinforcing plate 21, that is, each slit 41/42 does not penetrate the reinforcing plate 21 completely in the thickness direction of the reinforcing plate 21.

Alternatively, for each slit 41/42 that does not completely penetrate the stiffening plate 21, its opening direction on the stiffening plate 21 is toward the second surface 3b of the substrate 3 or away from the second surface 3b of the substrate 3.

Illustratively, as shown in fig. 3 to 6, the reinforcing plate 21 has a first surface 4a and a second surface 4b which are oppositely arranged along the thickness direction of the reinforcing plate 21, the slit structure 4 includes at least one slit 41/42, each slit 41 penetrates a part of the reinforcing plate 21 from the second surface 4b and extends in a direction perpendicular to the second surface 4b, that is, the opening direction of each slit 41 faces away from the second surface 3b of the substrate 3; each slit 42 penetrates a part of the reinforcing plate 21 from the first surface 4a and extends in a direction perpendicular to the first surface 4a, i.e., an opening direction of each slit 42 is directed toward the second surface 3b of the base 3. It should be understood that the extending direction of the opening of each slit 41/42 in this embodiment is perpendicular to the first surface 4a and/or the second surface 4b of the reinforcing plate 21 as an example, and in other embodiments, the extending direction of the opening of each slit 41/42 may be at an angle with the first surface 4a and/or the second surface 4b of the reinforcing plate 21; the above situations are all within the protection scope of the present invention.

Optionally, the at least one slit 41/42 has the same depth or a different depth.

Optionally, the thickness of the non-penetrated (remaining) portion of the reinforcing plate 21 is less than or equal to 90% of the thickness of the reinforcing plate 21. The thickness of the portion of the reinforcing plate 21 that is not penetrated (left) is the thickness remaining after cutting in the thickness direction of the reinforcing plate 21.

Fig. 7-9 are schematic cross-sectional views illustrating a pressure sensing module according to another embodiment of the utility model.

As shown in fig. 7 to 9, the reinforcing plate 21 has a first surface 4a and a second surface 4b which are oppositely arranged in the thickness direction of the reinforcing plate 21, and the slit structure 4 has both the slit 41 and the slit 42 which have different opening directions. Illustratively, each slit 41 opens in a direction away from the second surface 3b of the substrate 3, and each slit 42 opens in a direction toward the second surface 3b of the substrate 3.

Preferably, each slit 41 and each slit 42 do not intersect in the slit structure 4.

Preferably, in the gap structure 4, a certain vertical distance D is maintained between each gap 41 and each gap 42 adjacent to each other to avoid affecting the mechanical strength of the reinforcing plate 21.

Preferably, in the slit structure 4, each slit 41 and each slit 42 have substantially uniform and equal slit distances, that is, the slit width distances of the respective regions along the predetermined extending direction of each slit 41/42 may be approximately equal, so as to ensure that the stress concentration received by the respective regions in the reinforcing plate 21 is uniform.

Preferably, as shown in fig. 8-9, the slits 41 and the slits 42 are arranged in a staggered manner and uniformly distributed on the upper and lower sides of the reinforcing plate 21, wherein in the slit structure 4, the extension lengths of each slit 41 and each slit 42 may be the same or different. Each slit 41 and each slit 42 are arranged in a staggered manner, so that on one hand, the extension length of each slit 41/42 can be increased, the control precision of the stress concentration of the reinforcing plate 21 is improved, and on the other hand, each slit 41 and each slit 42 are arranged in a staggered manner, and the influence on the mechanical strength of the reinforcing plate 21 can be avoided.

Fig. 10 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model. Alternatively, as shown in fig. 10, unlike fig. 3 to 6, the slit structure 4 is embedded in the reinforcing plate 21, that is, the slit structure 4 is provided inside the reinforcing plate 21.

Illustratively, as shown in fig. 10, the gap structure 4 includes at least one gap 43, the gap 43 is embedded in the reinforcing plate 21, the gap 43 can also achieve the effect of stress concentration, and compared with the way that the gap structure 4 in fig. 3-6 starts to penetrate the reinforcing plate 21 from one side surface of the reinforcing plate 21, the reinforcing plate 21 in the embodiment has only the internal structure changed, and the external structure is not changed, so the contact area between the reinforcing plate 21 and the substrate 3 is not changed at all. When the reinforcing plate 21 is adhered or fixed on the second surface 3b of the substrate 3 by the adhesive or in other ways, since the contact area between the reinforcing plate 21 and the substrate 3 is not changed, on one hand, the adhesive strength between the reinforcing plate 21 and the substrate 3 is facilitated, on the other hand, the supporting strength of the reinforcing plate 21 is also facilitated to be ensured, and the substrate 3 can be prevented from being torn or broken due to deformation, so that the service lives of the substrate 3 and the pressure sensing module 10 are prolonged.

Third embodiment

The slot structure 4 comprises a combination of the two cases.

Fig. 11 is a schematic cross-sectional view of a pressure sensing module according to another embodiment of the utility model.

As shown in fig. 11, the slit structure 4 includes a first group of slits 44 and a second group of slits 45, the first group of slits 44 includes at least one slit 441, and each slit 441 of the first group of slits 44 penetrates the reinforcing plate 21 in the thickness direction of the reinforcing plate 21, the second group of slits 45 includes at least one slit 442, and each slit 442 of the second group of slits 45 penetrates only partially the reinforcing plate 21 in the thickness direction of the reinforcing plate 21.

Optionally, at least one of the slits 442 in the second set of slits 45 that does not extend through the thickness of the stiffener 21 may have the same or different depth.

Optionally, for each slit 442 in the second set of slits 45, its opening direction on the stiffening plate 21 faces away from the second surface 3b of the substrate 3 or faces away from the second surface 3b of the substrate 3.

Illustratively, as shown in fig. 11, the reinforcing plate 21 has a rectangular block shape, the reinforcing plate 21 has a first surface 4a and a second surface 4b which are oppositely arranged along the thickness direction of the reinforcing plate 21, a plurality of slits 441/442 extending toward the inside of the reinforcing plate 21 may be respectively arranged on the first surface 4a and the second surface 4b of the reinforcing plate 21, and the plurality of slits 441/442 may be divided into a first slit group 44 and a second slit group 45. Specifically, in fig. 11, each slit 441 in the first group of slits 44 penetrates the entirety of the reinforcing plate 21 and extends in a direction perpendicular to the first surface 4a and/or the second surface 4b of the reinforcing plate 21, and each slit 442 in the second group of slits 45 penetrates a portion of the reinforcing plate 21 from the first surface 4a and/or the second surface 4b of the reinforcing plate 21 and extends in a direction perpendicular to the first surface 4a and/or the second surface 4b of the reinforcing plate 21. It should be understood that, in the present embodiment, the extending direction of each slit 441/442 is perpendicular to the first surface 4a and/or the second surface 4b of the reinforcing plate 21 as an example, in other embodiments, the extending direction of each slit 441/442 may also be an angle with the first surface 4a and/or the second surface 4b of the reinforcing plate 21; the above situations are all within the protection scope of the present invention.

Preferably, each slit 441 in the first set of slits 44 and each slit 442 in the second set of slits 45 do not intersect with each other, otherwise the entire reinforcing plate 21 is cut off, affecting the mechanical strength of the reinforcing plate 21.

Preferably, each slit 441/442 in the first and second sets of slits 44, 45 has a substantially uniform and equal slit distance, i.e., the slit width distance of each region along the predetermined extension direction of each slit 441/442 may be approximately equal to ensure that the stress concentration experienced by each region within the stiffener 21 is uniform.

Preferably, as shown in fig. 11, the first set of slits 44 and the second set of slits 45 are arranged in a staggered manner, and the extension length of each slit 442 in the second set of slits 45 may be the same or different; set up first group gap 44 and second group gap 45 and be crisscross the arranging, on the one hand, can be favorable to increasing the gap quantity that sets up on stiffening plate 21, improve the control accuracy of the size of stiffening plate 21 stress concentration, on the other hand, first group gap 44 and second group gap 45 are the staggered arrangement and arrange, can avoid influencing the mechanical strength of stiffening plate 21.

Alternatively, each slit 40/41/42/441/442 in the slit structure 4 may have any one of a V-shaped, circular arc, and rectangular cross-sectional shape.

Optionally, the width of each slit 40/41/42/441/442 in the slit structure 4 is greater than 10 μm and smaller than the width of the pressure sensor 1 in the second extending direction.

The utility model also provides an electric toothbrush, and the electronic equipment comprises any one of the pressure sensing modules.

Fig. 12A is a schematic view of a portion of a power toothbrush according to an embodiment of the present invention. As shown in fig. 12A, the electric toothbrush 200 according to the embodiment of the present invention includes a toothbrush rod 8 and a toothbrush head (not shown) detachably connected to the toothbrush rod 8, wherein the detachable connection means may be a detachable connection means commonly used in the art, such as a screw connection, a snap connection, etc., and will not be described in detail herein. The pressure sensing module 10 is provided on a platform on one side of the toothbrush bar 8, wherein the platform is located at the front or middle of the toothbrush bar 8.

Specifically, a driving member (not shown) and a circuit board (not shown) electrically connected to the driving member are disposed in the toothbrush rod 8, and the pressure sensing module 10 is electrically connected to the circuit board on a platform on one side of the toothbrush rod 8 for detecting deformation of the toothbrush rod 8. Wherein a drive member may be provided in the handle 7 of the toothbrush bar 8, the output shaft of said drive member being connected to the brush head (not shown). The drive member may be, for example, an electric motor, preferably a linear motor. In addition, the toothbrush rod 8 may be provided with components such as a battery.

In particular, the toothbrush bar 8 comprises a front structure 5 and a middle structure 6, said middle structure 6 being adapted to receive said front structure 5, said front structure 5 being detachably connected to a brush head (not shown).

As shown in FIG. 12A, in this embodiment, the pressure sensing module 10 is provided on a platform on one side of the front end structure 5 of the toothbrush bar 8. The pressure sensing module 10 is adhered to the platform on one side of the front end structure 5 by glue or the like, and the hardness of the glue reaches the shore D level after curing. Under the technical means, when the brush head is deeply inserted into the oral cavity to contact with teeth, the front end structure 5 is slightly deformed, the deformation of the front end structure 5 generates stress concentration at the gap structure 4 of the reinforcing plate 21 in the pressure sensing module 10, the stress concentration can drive the substrate 3 to deform, then force is transmitted to the upper surface film or the lower surface film of the pressure sensor 1, after the wheatstone bridge arranged on the pressure sensor 1 senses the stress of the upper surface film or the lower surface film of the pressure sensor 1, a corresponding electric signal can be output, and the pressure sensing module 10 achieves the effect of detecting the deformation of the front end structure 5 by means of the stress concentration phenomenon of the gap structure 4 in the reinforcing plate 21. Then, through on microcontroller (Micro Controller Unit, MCU) feedback drive piece, when the pressure of feeling was too big (when excessively exerting oneself), microcontroller will corresponding reduction drive piece's rotational speed (for example reduce the drive power of motor), can effectively avoid high-speed bruising the tooth or avoid toothpaste foam to splash everywhere.

Because above-mentioned forced induction module 10 is last to be provided with gap structure 4, this gap structure 4 has the deformation that takes place toothbrush rod 8 and carries out stress concentration's effect, so front end structure 5 of toothbrush rod 8 need not to design recess or breach alone again in order to be regarded as stress concentration's stress trigger spare, only need provide one and be used for fixing forced induction module 10's platform can, simple structure has reduced the cost of manufacture.

Therefore, the electric toothbrush 200 of the present embodiment has a simple structure for detecting pressure, so that the manufacturing cost of the electric toothbrush 200 can be reduced and the economic efficiency of the electric toothbrush 200 can be improved. In addition, the slit structure 4 arranged in the reinforcing plate 21 can sensitively reflect the stress concentration phenomenon, so that the accuracy of the pressure detection of the brush head can be improved, and the user experience can be effectively improved.

Fig. 12B is a partial structural view of an electric toothbrush according to still another embodiment of the present invention.

As shown in fig. 12B, in the present embodiment, the pressure sensing module 10 is provided on a stage on one side of the middle structure 6 of the toothbrush bar 8. The middle structure 6 can also be regarded as a base for receiving the toothbrush rod 8, and the pressure sensing module 10 is adhered to the platform on one side of the middle structure 6 by glue or the like, and the hardness of the glue after curing reaches the Shore D level. Under the technical means, when the brush head is deeply inserted into the oral cavity to contact with teeth, the front end structure 5 is slightly deformed, the deformation of the front end structure 5 can be transmitted to the middle end structure 6, the deformation of the middle end structure 6 can generate stress concentration at the gap structure 4 of the reinforcing plate 21 in the pressure sensing module 10, the stress concentration can drive the substrate 3 to deform, further, the force is transmitted to the upper surface film or the lower surface film of the pressure sensor 1, after the stress of the upper surface film or the lower surface film of the pressure sensor 1 is sensed through a Wheatstone bridge arranged on the pressure sensor 1, a corresponding electric signal can be output, and the pressure sensing module 10 can achieve the effect of detecting the deformation of the middle end structure 6 by means of the stress concentration phenomenon of the gap structure 4 in the reinforcing plate 21. Then, feedback to the driving piece through microcontroller (Micro Controller Unit, MCU) to can be according to the rotational speed of the pressure value adjustment driving piece that obtains, when the pressure of feeling was too big (when exerting oneself excessively), microcontroller will corresponding reduction driving piece's rotational speed (for example reduce the drive power of motor), can effectively avoid high-speed bruising tooth or toothpaste foam to splash everywhere.

Because above-mentioned forced induction module 10 is last to be provided with gap structure 4, this gap structure 4 has the deformation that takes place toothbrush rod 8 and carries out stress concentration's effect, so the middle-end structure 6 of toothbrush rod 8 need not to design recess or breach alone again in order to be regarded as stress concentration's stress trigger piece, only need provide one and be used for fixing forced induction module 10's plane can, simple structure has reduced the cost of manufacture.

Therefore, according to the electric toothbrush 300 of the present embodiment, the structure for detecting the pressure is simple, so that the manufacturing cost of the electric toothbrush 300 can be reduced, and the economic efficiency of the electric toothbrush 300 can be improved. In addition, the slit structure 4 arranged in the reinforcing plate 21 can sensitively reflect the stress concentration phenomenon, so that the accuracy of the pressure detection of the brush head can be improved, and the user experience can be effectively improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (23)

1. The utility model provides a forced induction module, its characterized in that forced induction module includes:

a substrate having opposing first and second surfaces;

a pressure sensor fixedly connected to the first surface of the substrate;

a reinforcement member disposed on the second surface of the substrate, and a projection of the reinforcement member on the substrate at least partially overlaps a projection of the pressure sensor on the substrate;

the reinforcing part is provided with a gap structure, and after the pressure sensing module is attached to a target object, the gap structure can transmit stress generated by deformation of the target object to the pressure sensor.

2. The pressure sensing module of claim 1,

the slot structure includes at least one slot.

3. The pressure sensing module of claim 2, wherein the stiffening member is a stiffening plate, and wherein each of the slits extends at least partially through the stiffening plate in the first direction of extension of the substrate.

4. The pressure sensing module of claim 3, wherein the sum of the cross-sectional widths of all of the slots in the slot arrangement in a second direction of extension perpendicular to the first direction of extension is less than or equal to 90% of the width of the stiffener in that direction.

5. The pressure sensing module of claim 4, wherein each of the slits extends through the stiffener in a thickness direction of the stiffener.

6. The pressure sensing module of claim 4, wherein each of the slits extends only partially through the stiffener in a thickness direction of the stiffener.

7. The pressure sensing module of claim 6, wherein for each slit, its opening direction is towards the second surface of the substrate or away from the second surface of the substrate.

8. The pressure sensing module of claim 7, wherein for each gap, the thickness of the non-penetrated portion of the stiffener is less than or equal to 90% of the thickness of the stiffener.

9. The pressure sensing module of claim 6, wherein the at least one slit has the same depth or different depths.

10. The pressure sensing module of claim 4, wherein the gap structure comprises a first set of gaps and a second set of gaps, the first set of gaps comprising at least one gap and each gap of the first set of gaps extending through the stiffener in a thickness direction of the stiffener, the second set of gaps comprising at least one gap and each gap of the second set of gaps extending only partially through the stiffener in the thickness direction of the stiffener.

11. The pressure sensing module of claim 10, wherein for each slit of the second set of slits, an opening direction thereof is toward the second surface of the substrate or away from the second surface of the substrate.

12. The pressure sensing module of claim 10, wherein each of the first set of slits and each of the second set of slits do not intersect each other.

13. The pressure sensing module of claim 12, wherein the first set of apertures and the second set of apertures are staggered.

14. The pressure sensing module of claim 10, wherein the second set of slots have the same depth or different depths.

15. The pressure sensing module of claim 4, wherein each slot of the slot structure has a cross-sectional shape selected from the group consisting of a V-shape, an arc shape, and a rectangle shape.

16. The pressure sensing module of claim 15, wherein a width of each of the slits is greater than 10 μm and less than a width of the pressure sensor in the second direction of extension.

17. The pressure sensing module of claim 1, wherein the reinforcement member is comprised of any one of a metal, a ceramic, or a carbon fiber material.

18. The pressure sensing module of claim 1, wherein the pressure sensor is fixedly coupled to the base via a weld.

19. The pressure sensing module of claim 1, wherein the reinforcement member is fixedly attached to the substrate by an adhesive, wherein the cured adhesive has a hardness of shore D.

20. The pressure sensing module of claim 1, wherein the reinforcement member is integrally formed with the base.

21. An electric toothbrush comprising a pressure sensing module according to any one of claims 1-20.

22. The powered toothbrush as defined in claim 21, further comprising a toothbrush bar, wherein the pressure sensing module is disposed on a platform on a side of the toothbrush bar, wherein the platform is located at a front or middle portion of the toothbrush bar.

23. The electric toothbrush according to claim 22, wherein the pressure sensing module is fixedly connected to the platform by an adhesive, and the cured hardness of the adhesive reaches Shore D.

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