Key and dental handheld device

Abstract

The utility model belongs to the technical field of dental medical instruments, and relates to a key and dental handheld equipment. The key comprises a key body, a first movable ring and a first connecting arm, the key body is located in the first movable ring, the two ends of the first connecting arm are connected with the key body and the first movable ring respectively, the first movable ring is provided with at least two installation positions, the multiple installation positions are distributed on the two sides of the key body, and the installation positions are used for being connected with the inner side of the shell. The key body is used for being arranged corresponding to the through hole of the shell. According to the application, an effect of pressing deformation to trigger the switch is achieved through cooperation among the key body, the first movable ring and the first connecting arm without using a rubber coating process to wrap an elastic material on the surface of the shell and without setting a veneer on the surface of the shell, so that the process steps, the manual processing cost and the rework cost are reduced, and the production efficiency is improved. The quality and appearance reject ratio are reduced, and the size of the dental handheld equipment applying the dental handheld equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of dental medical device technology, and more specifically, to a button and a dental handheld device. Background Technology

[0002] Dental handheld devices typically have two common button structures. One uses an internal switch with a through-hole in the outer casing to align it. The other has a structure similar to a mosquito coil within the through-hole, with a central protrusion above the switch for contact, surrounded by rounded, flexible arms to connect the protrusion to the outer casing. Because of the through-hole in the outer casing, an adhesive-backed veneer is needed above it to conceal imperfections. This veneer is applied manually, which can lead to issues like poor adhesion, lifting, detachment, uneven edges, and gaps. This results in repeated rework by assembly workers, low yield rates, and high costs. Furthermore, the veneer can obstruct the movement of the buttons. To ensure a good tactile feedback, the button needs a highly elastic arm structure, similar to a mosquito coil. However, because the injection molding of this elastic arm structure requires sufficient space for a serpentine bending arm and a pressing area, the button size is relatively large, necessitating a large outer shell for the dental handheld device. Another option is to use an overmolding process to coat the outer shell with an elastic material. The material's elasticity allows for deformation upon pressing, triggering the switch. However, this overmolding process occurs after the outer shell injection molding, resulting in a lower yield rate compared to single-injection molding, and the double process also increases costs. Utility Model Content

[0003] The present application provides a button and a dental handheld device to solve the problems of complex button installation process, high cost, poor quality and large size of dental handheld devices in the prior art.

[0004] To solve the above-mentioned technical problems, this application provides a button, which adopts the following technical solution:

[0005] A button includes: a button body, a first movable ring, and a first connecting arm. The button body is located inside the first movable ring. The two ends of the first connecting arm are respectively connected to the button body and the first movable ring. The first movable ring has at least two mounting positions, and a plurality of mounting positions are distributed on both sides of the button body. The mounting positions are used to connect to the inner side of the outer shell, and the button body is used to correspond to the through holes of the outer shell.

[0006] Furthermore, a symmetry axis is provided along the length direction of the button body; the number of the first connecting arms is N1, N1≥2 and is an even number; the installation position and the first connecting arms are symmetrically arranged along the symmetry axis.

[0007] Furthermore, when the number of the first connecting arms is greater than 2, the plurality of the first connecting arms are evenly distributed between the two installation positions.

[0008] Furthermore, the button body has a protrusion, one end of which is a contact surface, and the mounting position in the thickness direction of the button body is lower than the contact surface; and / or

[0009] The installation position has a positioning hole, and the positioning hole passes through both ends of the first movable ring; and / or

[0010] The first connecting arm is in a straight line or a Y-shape; and / or

[0011] The button has an arc-shaped cross-section, and both sides of the button extend away from the contact surface.

[0012] Furthermore, the protrusion is elliptical or oblong; and / or

[0013] The protrusion is provided with a trigger protrusion at the end away from the contact surface.

[0014] Furthermore, the number of button bodies is N2, where N2≥2; the number of the first active rings is the same as the number of button bodies, and multiple first active rings are connected in sequence, with one button body in each first active ring.

[0015] Furthermore, at least a portion of the two adjacent first movable rings overlap to form a connecting portion, and the first movable rings and the connecting portion are connected by a first inclined portion, forming an accommodating cavity between the two adjacent first inclined portions.

[0016] Furthermore, the number of button bodies is N3, where N3≥3 and is an odd number; the button also includes a second movable ring and a second connecting arm, with the second movable ring connecting any two first movable rings, and the first movable ring and the second movable ring being connected, each of the first movable ring and each of the second movable rings having one button body, and the total number of the first movable ring and the second movable ring being the same as the number of button bodies; the first connecting arm and the second connecting arm are vertically arranged, and the installation position is vertically arranged with the first connecting arm.

[0017] Furthermore, at least a portion of the first movable ring and the second movable ring overlap to form a connecting segment. The first movable ring is connected to the connecting segment via a first inclined segment, and the second movable ring is connected to the connecting segment via a second inclined segment. An accommodating space is formed between the first inclined segment and the second inclined segment.

[0018] Furthermore, the second connecting arm is Y-shaped; one end of the second connecting arm is connected to the second movable ring, and the other two ends of the second connecting arm are connected to the button body; or, one end of the second connecting arm is connected to the button body, and the other two ends of the second connecting arm are connected to the second movable ring.

[0019] To address the aforementioned technical problems, this application also provides a handheld dental device, which employs the following technical solution:

[0020] A dental handheld device includes a housing and a button as described above. The housing has a through hole, the button body is located in the through hole, and the mounting position is connected to the inner wall of the housing.

[0021] Furthermore, the button body has a ring platform on the outer periphery of one end inside the housing, the first connecting arm is connected to the ring platform, and the ring platform abuts against the inner wall of the housing.

[0022] Compared with the prior art, the technical solution of this application has the following advantages: This application fixes the button body to the inside of the housing of the dental handheld device through the installation position, and the installation is firm; the button body of this application is located in the through hole. After using the button of this application, there is no need to use the overmolding process to wrap the elastic material on the surface of the housing, and there is no need to set the veneer on the surface of the housing. Instead, the button body, the first movable ring and the first connecting arm cooperate to achieve the effect of pressing deformation to trigger the switch, thereby reducing process steps, manual processing costs and rework costs, reducing the quality and appearance defect rate, and the absence of veneer and overmolding can reduce the size of the dental handheld device using this application. Attached Figure Description

[0023] To more clearly illustrate the solution of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a button provided in an embodiment of this application;

[0025] Figure 2 yes Figure 1 A three-dimensional schematic diagram;

[0026] Figure 3 yes Figure 1 A three-dimensional diagram from another perspective;

[0027] Figure 4This is a schematic diagram of the assembly of buttons and housing in a dental handheld device provided in an embodiment of this application;

[0028] Figure 5 yes Figure 4 Rear view;

[0029] Figure 6 This is a cross-sectional view of the buttons, housing, and root canal motor assembled together in a dental handheld device according to an embodiment of this application.

[0030] Figure 7 yes Figure 6 Enlarged view of point A in the middle.

[0031] Reference numerals: 100, button; 1, button body; 11, protrusion; 12, contact surface; 13, trigger boss; 14, ring platform; 2, first movable ring; 3, first connecting arm; 4, installation position; 5, axis of symmetry; 6, positioning hole; 7, second movable ring; 8, second connecting arm; 91, connecting section; 92, first beveled section; 93, second beveled section; 94, accommodating space; 200, outer shell; 300, through hole; 400, root canal motor; 500, switch; 600, positioning post. Detailed Implementation

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, not to describe a particular order.

[0033] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0034] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0035] This application provides a button 100, such as... Figures 1 to 3As shown, the button 100 includes: a button body 1, a first movable ring 2, and a first connecting arm 3. The button body 1 is located inside the first movable ring 2. The two ends of the first connecting arm 3 are respectively connected to the button body 1 and the first movable ring 2. The first movable ring 2 has at least two mounting positions 4. Multiple mounting positions 4 are distributed on both sides of the button body 1. The mounting positions 4 are used to connect with the inner side of the outer shell. The button body 1 is used to correspond to the through hole of the outer shell.

[0036] The working principle of a button 100 provided in this application embodiment is as follows: See Figures 4 to 7 The button body 1 is fixed in the desired position through the mounting position 4, so that the button body 1 is aligned with the through hole 300 of the dental handheld device housing 200. When the user presses the button body 1, the button body 1 deforms perpendicular to the direction of force. The deformation is transmitted to the first movable ring 2 through the first connecting arm 3. The first movable ring 2 counteracts the deformation caused by the press, reducing the impact of the deformation on the mounting position 4. That is, the deformation of the button body 1 is free and will not be unable to deform because the mounting position 4 is fixed, reducing the force required for the user to press the button 100, thereby improving the overall feel of the button 100 and improving the sensitivity of the trigger switch 500.

[0037] The beneficial effects of the button 100 provided in this application embodiment are as follows: The button 100 is fixed to the inner side of the housing 200 of the dental handheld device through the installation position 4, and the installation is firm; the button body 1 of this application is located in the through hole 300. After using the button 100 of this application, it is not necessary to use the overmolding process to wrap the elastic material on the surface of the housing 200, and it is not necessary to set the surface of the housing 200. Instead, the button body 1, the first movable ring 2 and the first connecting arm 3 cooperate to achieve the effect of pressing deformation to trigger the switch 500, thereby reducing process steps, labor processing costs and rework costs, reducing the quality and appearance defect rate, and reducing the size of the dental handheld device using this application due to the absence of surface and overmolding.

[0038] In this embodiment, the mounting position 4 can be fixed to the outer casing 200 by processes such as adhesive, hot melt, or screw fastening.

[0039] Furthermore, there are two mounting positions 4, with the first connecting arm 3 located between the two mounting positions 4.

[0040] In this embodiment, there are two installation positions 4, and the first connecting arm 3 is located between the two installation positions 4, which can distribute the force on the button 100 and thus prevent the button 100 from falling off.

[0041] like Figure 1As shown, further, a symmetry axis 5 is provided along the length direction of the button body 1; the number of the first connecting arms 3 is N1, N1≥2 and is an even number; the installation position 4 and the first connecting arms 3 are symmetrically arranged along the symmetry axis 5.

[0042] In this embodiment, the number of first connecting arms 3 is N1, where N1 ≥ 2 and is an even number. In addition, the mounting positions 4 and the first connecting arms 3 are symmetrically arranged along the axis of symmetry 5, so that when the button body 1 deforms, the force transmitted to any mounting position 4 through the first connecting arms 3 is uniform. This can prevent any mounting position 4 from falling off and also improve the feel of the button 100.

[0043] Furthermore, when the number of the first connecting arms 3 is greater than 2, the multiple first connecting arms 3 are evenly distributed between the two mounting positions 4.

[0044] In this embodiment, when the button body 1 is further deformed, the force transmitted to any mounting position 4 through the first connecting arm 3 is uniform.

[0045] In this embodiment, the number of the first connecting arms 3 can be two, three, four, etc.

[0046] Furthermore, the first movable ring 2 is symmetrically arranged along the axis of symmetry 5.

[0047] In this embodiment, the first movable ring 2 is symmetrically arranged along the axis of symmetry 5, so that when the button body 1 is deformed, the force transmitted to any mounting position 4 through the first connecting arm 3 is uniform.

[0048] In this embodiment, the first movable ring 2 can be any one of a circle, square, polygon, or irregular shape that is symmetrically arranged along the axis of symmetry 5. This application does not impose any restrictions on it.

[0049] Furthermore, the button body 1 has a protrusion 11, one end of which is a contact surface 12, and the mounting position 4 is lower than the contact surface 12 in the thickness direction of the button body 1.

[0050] In this embodiment, the mounting position 4 in the thickness direction of the button body 1 is lower than the contact surface 12, so that when the button body 1 is fixed in the desired position by the mounting position 4, the protrusion 11 can be located in the through hole 300 and protrude out of the through hole 300, and the protrusion height is similar to the stroke of the switch 500; when the user presses the contact surface 12 of the protrusion 11, the button body 1 deforms perpendicular to the direction of force.

[0051] Furthermore, the protrusion 11 is elliptical or oblong.

[0052] In this embodiment, the elliptical or oblong protrusion 11 can be applied to smaller devices to maximize the size of the button 100 and make full use of space, thus ensuring that the device is lightweight while also making it very convenient for users to press.

[0053] like Figure 3 As shown, the protrusion 11 further includes a trigger protrusion 13 at the end away from the contact surface 12.

[0054] In this embodiment, the button body 1 is fixed in the desired position by the installation position 4. The protrusion 11 of the button body 1 is aligned with the through hole 300 of the dental handheld device housing 200, so that the protrusion 11 protrudes out of the through hole 300, the protrusion height is similar to the stroke of the switch 500, and the trigger boss 13 abuts against the switch 500.

[0055] In this embodiment, the user presses the contact surface 12 to transmit the pressing force, causing the trigger boss 13 to contact the switch 500.

[0056] Furthermore, the contact surface 12 is provided with an indicator (not shown) to facilitate the user in identifying the function of the switch 500 corresponding to the button 100.

[0057] Furthermore, there is a gap between the trigger boss 13 and the switch 500 to prevent the trigger boss 13 from accidentally touching the switch 500.

[0058] Furthermore, the area of ​​the trigger boss 13 is larger than the area of ​​the switch 500 to ensure the stability of the triggering.

[0059] Furthermore, the installation position 4 is provided with a positioning hole 6, and the positioning hole 6 passes through both ends of the first movable ring 2.

[0060] In this embodiment, the positioning hole 6 is used to mate with the positioning post 600 on the inner wall of the outer shell 200, and the positioning hole 6 is sleeved on the positioning post 600. When using the hot melt process, the height of the positioning post 600 is slightly higher than the positioning hole 6, so as to heat the part of the positioning post 600 that protrudes from the positioning hole 6. After the protruding part of the positioning post 600 melts, it is laid on the upper end face of the positioning hole 6, which achieves a fastening effect. When using the adhesive process, the positioning hole 6 is sleeved on the positioning post 600, and then adhesive is injected into the gap between the two. After the adhesive solidifies, a fastening effect is achieved. The positioning hole 6 can also be a screw hole, and screws are used for fastening, so that the nut is pressed on the end face of the positioning hole 6.

[0061] In this embodiment, a positioning hole 6 is provided to facilitate the fixed installation of the button 100 and the housing 200.

[0062] Furthermore, the first connecting arm 3 is either straight or Y-shaped.

[0063] In this embodiment, the first connecting arm 3 is in the shape of a straight line, which can reduce the difficulty of production; the first connecting arm 3 is in the shape of a Y, which can increase the connection area with the button body 1 or the first movable ring 2, thereby improving the reliability; the shape of the first connecting arm 3 can be set according to actual needs, and this application does not impose any restrictions on it.

[0064] Furthermore, the cross-section of the button 100 is arc-shaped, and both sides of the button 100 extend away from the contact surface 12.

[0065] In this embodiment, the cross-section of the button 100 is arc-shaped, and both sides of the button 100 extend away from the contact surface 12, so that when the button 100 is placed inside the housing 200 through the mounting position 4, it can be better fitted inside the housing 200; in addition, since it is arc-shaped, it can enhance the elastic rebound force of the first connecting arm 3.

[0066] In one embodiment, the number of button bodies 1 is N2, where N2≥2; the number of first movable rings 2 is the same as the number of button bodies 1, and multiple first movable rings 2 are connected in sequence, with each first movable ring 2 containing one button body 1.

[0067] In the above embodiments, the number of button bodies 1 is N2. When N2≥2, multiple button bodies 1 are respectively used to correspond to multiple switches 500 of the dental handheld device, thereby improving the practicality of the button 100.

[0068] Furthermore, in the above embodiment, at least a portion of the two adjacent first movable rings 2 overlap to form a connecting portion (not shown), the first movable ring 2 and the connecting portion (not shown) are connected by a first inclined portion (not shown), and an accommodating cavity (not shown) is formed between two adjacent first inclined portions.

[0069] In the above embodiments, the accommodating cavity is used to accommodate the internal structure of the housing 200, such as connecting pillars (not shown) or connecting holes (not shown), etc., so as to make full use of space and ensure that the device using this application is small and lightweight.

[0070] In another embodiment, the number of button bodies 1 is N3, where N3 ≥ 3 and is an odd number; the button 100 further includes a second movable ring 7 and a second connecting arm 8, with the second movable ring 7 connecting any two first movable rings 2, and the first movable ring 2 and the second movable ring 7 connected, each of the first movable ring 2 and each of the second movable rings 7 respectively containing one button body 1, and the total number of the first movable rings 2 and the second movable rings 7 being the same as the number of button bodies 1; the first connecting arm 3 and the second connecting arm 8 are vertically arranged, and the mounting position 4 is vertically arranged with the first connecting arm 3.

[0071] In the above embodiments, when the number of button bodies 1 is N3, and N3≥3 and is an odd number, a second movable circle 7 is provided between any two first movable circles 2. The second movable circle 7 does not need to be set for installation position, and can be installed and fixed by the first movable circle 2 connected to it, reducing installation steps; and the second connecting arm 8 is set perpendicular to the first connecting arm 3, which can prevent the button body 1 connected to the first connecting arm 3 from being driven down when the user presses the button body 1 connected to the first connecting arm 3, thereby reducing the false touch rate of switch 500. Conversely, when the user presses the button body 1 connected to the second connecting arm 8, it can prevent the button body 1 connected to the first connecting arm 3 from being driven down.

[0072] In the above embodiments, the second movable ring 7 can be any one of a circle, square, polygon, or irregular shape arranged symmetrically along the axis of symmetry 5, and this application does not impose any restrictions on it.

[0073] like Figure 3 and Figure 5 As shown in the above embodiment, the first movable ring 2 and the second movable ring 7 are further combined at least partially to form a connecting segment 91. The first movable ring 2 and the connecting segment 91 are connected by a first inclined segment 92, and the second movable ring 7 and the connecting segment 91 are connected by a second inclined segment 93. An accommodating space 94 is formed between the first inclined segment 92 and the second inclined segment 93.

[0074] In the above embodiments, the accommodating space 94 is used to accommodate the internal structure of the housing 200, such as connecting pillars (not shown) or connecting holes (not shown), etc., so as to make full use of the space and ensure that the device using this application is small and lightweight.

[0075] Furthermore, the second connecting arm 8 is Y-shaped; one end of the second connecting arm 8 is connected to the second movable ring 7, and the other two ends of the second connecting arm 8 are connected to the button body 1; or, one end of the second connecting arm 8 is connected to the button body 1, and the other two ends of the second connecting arm 8 are connected to the second movable ring 7.

[0076] In this embodiment, the second connecting arm 8 is Y-shaped, which can increase the connection area with the button body 1 or the second movable ring 7 to improve reliability.

[0077] Preferably, one end of the second connecting arm 8 is connected to the second movable ring 7, and the other two ends of the second connecting arm 8 are connected to the button body 1; since the button body 1 is elliptical or oblong, the two ends of the second connecting arm 8 are connected to the button body 1 so that when the button body 1 is deformed, the deformation is transmitted through the second connecting arm 8.

[0078] In this embodiment, the button 100 has an arc-shaped cross-section, allowing it to fit better against the inner side of the housing 200; furthermore, the arc shape enhances the elastic rebound force of the first connecting arm 3 and the second connecting arm 8. This application also provides a dental handheld device, such as... Figures 1 to 7 As shown, the dental handheld device includes a housing 200 and a button 100 as described above. The housing 200 has a through hole 300, the button body 1 is located in the through hole 300, and the mounting position 4 is connected to the inner wall of the housing 200.

[0079] The working principle of a handheld dental device provided in this application embodiment is as follows: See Figures 4 to 7 The button body 1 is fixed in the desired position through the mounting position 4, so that the button body 1 is aligned with the through hole 300 of the dental handheld device housing 200. When the user presses the button body 1, the button body 1 deforms perpendicular to the direction of force. The deformation is transmitted to the first movable ring 2 through the first connecting arm 3. The first movable ring 2 counteracts the deformation caused by the press, reducing the impact of the deformation on the mounting position 4. That is, the deformation of the button body 1 is free and will not be unable to deform because the mounting position 4 is fixed, reducing the force required for the user to press the button 100, thereby improving the overall feel of the button 100 and improving the sensitivity of the trigger switch 500.

[0080] The beneficial effects of the dental handheld device provided in this application embodiment are as follows: the button 100 is fixed to the inside of the housing 200 of the dental handheld device through the installation position 4, and the installation is firm; the button body 1 of this application is located in the through hole 300. After using the button 100, there is no need to use the overmolding process to wrap the elastic material on the surface of the housing 200, and there is no need to set the veneer on the surface of the housing 200. Instead, the button body 1, the first movable ring 2 and the first connecting arm 3 cooperate to achieve the effect of pressing deformation to trigger the switch 500, thereby reducing process steps, manual processing costs and rework costs, reducing the quality and appearance defect rate, and reducing the size of the dental handheld device using this application due to the absence of veneer and overmolding.

[0081] In this embodiment, the mounting position 4 can be fixed to the outer casing 200 by processes such as adhesive, hot melt, or screw fastening.

[0082] Furthermore, the dental handheld device also includes a root canal motor 400 with a switch 500, the root canal motor 400 being disposed within the housing 200, and the switch 500 being aligned with the through hole 300; when the user presses the button body 1, the button body 1 triggers the switch 500.

[0083] Furthermore, the inner wall of the outer casing 200 is provided with a positioning post 600, which is used to cooperate with the positioning hole 6.

[0084] Furthermore, the button body 1 has a ring platform 14 on the outer periphery of one end inside the housing 200, the first connecting arm 3 is connected to the ring platform 14, and the ring platform 14 abuts against the inner wall of the housing 200.

[0085] In this embodiment, the ring platform 14 abuts against the inner wall of the outer shell 200, which can reduce the possibility of dust and moisture entering the outer shell 200 through the gap between the button body 1 and the through hole 300.

[0086] In this embodiment, the annular platform 14 is located on the outer periphery of the end of the protrusion 11 away from the contact surface 12.

[0087] Furthermore, the outer wall of the button body 1 is fitted with the inner wall of the through hole 300 with a clearance; this further reduces the possibility of dust and moisture entering the housing 200 through the gap between the button body 1 and the through hole 300, thereby improving the sealing performance.

[0088] Furthermore, the two ends of the first connecting arm 3 are respectively connected to the ring platform 14 and the first movable ring 2.

[0089] Furthermore, the two ends of the second connecting arm 8 are respectively connected to the ring platform 14 and the second movable ring 7.

[0090] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.

Claims

1. A button, characterized in that, include: The device comprises a button body, a first movable ring, and a first connecting arm. The button body is located within the first movable ring. The two ends of the first connecting arm are respectively connected to the button body and the first movable ring. The first movable ring has at least two mounting positions, and multiple mounting positions are distributed on both sides of the button body. The mounting positions are used to connect to the inner side of the outer casing, and the button body is used to correspond to the through holes of the outer casing.

2. The button according to claim 1, characterized in that, A symmetry axis is provided along the length direction of the button body; the number of the first connecting arms is N1, N1≥2 and is an even number; the installation position and the first connecting arms are symmetrically arranged along the symmetry axis.

3. The button according to claim 2, characterized in that, When the number of the first connecting arms is greater than 2, the multiple first connecting arms are evenly distributed between the two installation positions.

4. The button according to claim 1, characterized in that, The button body has a protrusion, one end of which is a contact surface. The mounting position, in the thickness direction of the button body, is lower than the contact surface; and / or The installation position has a positioning hole, and the positioning hole passes through both ends of the first movable ring; and / or The first connecting arm is in a straight line or a Y-shape; and / or The button has an arc-shaped cross-section, and both sides of the button extend away from the contact surface.

5. The button according to claim 4, characterized in that, The protrusion is elliptical or oblong; and / or The protrusion is provided with a trigger protrusion at the end away from the contact surface.

6. The button according to any one of claims 1 to 5, characterized in that, The number of button bodies is N2, where N2≥2; the number of the first movable rings is the same as the number of button bodies, and multiple first movable rings are connected in sequence, with one button body in each first movable ring.

7. The button according to claim 6, characterized in that, At least a portion of the two adjacent first movable rings overlap to form a connecting portion, and the first movable rings and the connecting portion are connected by a first inclined portion, forming an accommodating cavity between the two adjacent first inclined portions.

8. The button according to any one of claims 1 to 5, characterized in that, The number of button bodies is N3, where N3≥3 and is an odd number; the button also includes a second movable ring and a second connecting arm, with the second movable ring connecting any two first movable rings, and the first movable ring and the second movable ring being connected, each of the first movable ring and each of the second movable rings having one button body, and the total number of the first movable ring and the second movable ring being the same as the number of button bodies; the first connecting arm and the second connecting arm are vertically arranged, and the installation position is vertically arranged with the first connecting arm.

9. The button according to claim 8, characterized in that, The first movable ring and the second movable ring have at least a portion of their rings overlap to form a connecting segment. The first movable ring is connected to the connecting segment via a first inclined segment, and the second movable ring is connected to the connecting segment via a second inclined segment. An accommodating space is formed between the first inclined segment and the second inclined segment.

10. The button according to claim 8, characterized in that, The second connecting arm is Y-shaped; one end of the second connecting arm is connected to the second movable ring, and the other two ends of the second connecting arm are connected to the button body; or, one end of the second connecting arm is connected to the button body, and the other two ends of the second connecting arm are connected to the second movable ring.

11. A handheld dental device, characterized in that, The device includes a housing and a button as described in any one of claims 1 to 10, wherein the housing has a through hole, the button body is located within the through hole, and the mounting position is connected to the inner wall of the housing.

12. The dental handheld device according to claim 11, characterized in that, The button body is provided with a ring platform on the outer periphery of one end of the inner shell. The first connecting arm is connected to the ring platform, and the ring platform abuts against the inner wall of the shell.

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