Pressure sensor structure and electronic pressure pen

Abstract

This utility model relates to the field of sensor technology, providing a pressure sensor structure and an electronic pressure pen. The pressure sensor structure includes an elastic body and a flexible circuit board. The elastic body includes an elastic main body and a contact structure for contacting a pressure-applying structure of an external device. The flexible circuit board is located on the side of the elastic main body away from the contact structure and is electrically connected to the main control circuit board of the external device. The pressure sensor structure provided by this application has a simple overall structure. Furthermore, by adding the contact structure, the assembly precision between the elastic main body and the external pressure-applying structure is reduced. The force applied by the pressure-applying structure can be transmitted to the elastic main body more quickly, and the deformation of the elastic main body under force is more pronounced, which also improves the pressure sensitivity accuracy of the pressure sensor structure to a certain extent.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular provides a pressure sensor structure and an electronic pressure pen. Background Technology

[0002] With the development of smart devices, electronic pressure pens are being used more and more widely. For example, they can be used on tablets, computers, and e-readers to achieve paperless office work, paperless learning, and note-taking. They can even replace physical pens for some professional drawing.

[0003] Currently, the core structure of electronic pressure pens in related products consists of metal stress plates and pressure sensors such as MEMS (Microelectro Mechanical Systems). The manufacturing process of these pressure sensors is complex and costly. In particular, the high tolerance requirements when assembling the pressure sensor with the pen tip also lead to assembly difficulties. Utility Model Content

[0004] The purpose of this invention is to provide a pressure sensor structure and an electronic pressure pen, aiming to solve the problems of complex manufacturing processes and high assembly precision requirements of existing pressure sensors.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] In a first aspect, embodiments of this application provide a pressure sensor structure, including:

[0007] An elastomer, the elastomer including an elastic body portion and an abutting structure disposed on the elastic body portion, the abutting structure being used to abut against an external pressure-applying structure;

[0008] A flexible circuit board is disposed on the side of the elastic main body away from the abutting structure, and the flexible circuit board is used for electrical connection with the main control circuit board of an external device.

[0009] The beneficial effects of this utility model are as follows: The pressure sensor structure provided by this utility model adds a contact structure to its elastic main body. This contact structure contacts the external pressure-applying structure, allowing the applied pressure force to be transmitted to the elastic main body, causing deformation. Furthermore, the flexible circuit board converts the deformation potential energy of the elastic main body into an electrical signal and outputs it to the main control circuit board of the external device, thereby achieving pressure detection. The pressure sensor structure provided by this application has a simple overall structure. Furthermore, by adding the contact structure, the assembly precision between the elastic main body and the external pressure-applying structure is reduced. The force applied by the pressure-applying structure is transmitted to the elastic main body more quickly, and the deformation of the elastic main body under force is more pronounced, which also improves the pressure sensing accuracy of the pressure sensor structure to a certain extent.

[0010] In one embodiment, the abutment structure is located in the middle of the elastic main body.

[0011] In one embodiment, the abutment structure includes a protrusion provided on the elastic body portion.

[0012] In one embodiment, the number of protrusions is one, and the geometric center of the protrusion is located at the geometric center of the elastic body portion.

[0013] In one embodiment, the number of protrusions is at least two, and the midpoint of the line connecting the geometric center points of each protrusion coincides with the geometric center point of the elastic body.

[0014] In one embodiment, the abutment structure includes a recess formed by an indentation in the surface phase of the elastic body portion.

[0015] In one embodiment, the geometric center of the recess is located at the geometric center of the elastic body portion.

[0016] In one embodiment, the pressure sensor structure includes a membrane layer disposed between the elastic body and the flexible circuit board.

[0017] Secondly, embodiments of this application also provide an electronic pressure pen, including the pressure sensor structure as described above.

[0018] The beneficial effects of this utility model are as follows: The electronic pressure pen provided by this utility model has lower assembly precision requirements and higher sensitivity, based on the above-mentioned pressure sensor structure.

[0019] In some embodiments, the electronic pressure pen further includes a pen tip and an adapter circuit board, the pen tip abutting against the abutting structure of the pressure sensor structure, and the adapter circuit board being electrically connected to the flexible circuit board of the pressure sensor structure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the pressure sensor structure provided in an embodiment of the present utility model;

[0022] Figure 2 A schematic diagram of the structure of the electronic pressure pen provided in this embodiment of the utility model.

[0023] The following are the labeling elements in the figure:

[0024] 100. Pressure sensor structure; 200. Pen tip; 300. Adapter circuit board;

[0025] 10. Elastomer; 11. Elastic main body; 12. Abutment structure;

[0026] 20. Flexible circuit board;

[0027] 30. Membrane layer. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] Firstly, please refer to Figure 1 This application provides a pressure sensor structure 100, including an elastomer 10 and a flexible circuit board 20.

[0033] The elastomer 10 includes an elastic body portion 11 and an abutting structure 12 disposed on the elastic body portion 11. The abutting structure 12 is used to abut against the pressure-applying structure of the peripheral device. A flexible circuit board 20 is disposed on the side of the elastic body portion 11 away from the abutting structure 12, and the flexible circuit board 20 is used to electrically connect to the main control circuit board of the peripheral device.

[0034] Understandably, the elastic main body 11 is the main body of the elastic body 10 and the part that mainly undergoes deformation. The elastic main body 11 can be a metal stress sheet, MEMS or other structural components that can undergo deformation. Usually, after being subjected to force, it will undergo corresponding deformation. Therefore, in order to collect the applied force as much as possible, the elastic main body 11 is usually a thin sheet structure and has a certain strength.

[0035] The abutting structure 12 is a structure used to directly abut against the pressure-applying structure. The abutting structure 12 is formed on the surface of the elastic main body 11. The connection between the abutting structure 12 and the elastic main body 11 includes, but is not limited to, integral molding, welding, snap-fit, plug-in and threaded connection.

[0036] The abutment structure 12 can be a protrusion extending from the surface of the elastic main body 11. That is, the protrusion abuts against the pressure-applying structure, and the assembly accuracy between the protrusion and the pressure-applying structure can be adjusted by the height of the protrusion, thereby reducing assembly difficulty. Of course, the number and shape of the protrusions can be adjusted adaptively.

[0037] For example, there is one protrusion, and the protrusion is columnar in shape. The end near the pressure-applying structure is arc-shaped to ensure smooth contact between the protrusion and the pressure-applying structure. The protrusion is located at the geometric center of the elastic body 11. When it is squeezed and pressed, the deformation starts from the geometric center of the elastic body 11 to more accurately transmit the force information to the external main control circuit board through the flexible circuit board 20.

[0038] The abutment structure 12 can also be a recess formed by the surface of the elastic main body 11. In this embodiment, a protruding structure adapted to the recess can be provided on the pressure structure to achieve the abutment and adaptation between the recess and the pressure structure. In addition, the depth of the recess and the protruding height of the protruding structure need to be adjusted to adjust the assembly accuracy between the abutment structure 12 and the pressure structure, so as to reduce the assembly difficulty.

[0039] A pressure-sensitive circuit is formed on the flexible circuit board 20. Typically, the pressure-sensitive circuit is composed of multiple ink resistors, and the multiple ink resistors form a Wheatstone bridge. When the elastic body 11 undergoes a slight deformation, a potential difference is formed on the pressure-sensitive circuit on the flexible circuit board 20, thereby converting mechanical energy into an electrical signal.

[0040] The pressure sensor structure 100 provided by this utility model includes an additional abutment structure 12 on its elastic main body 11. The abutment structure 12 abuts against an external pressure-applying structure, allowing the pressure force to be transmitted to the elastic main body 11 through the abutment structure 12, causing deformation of the elastic main body 11. A flexible circuit board 20 converts the deformation potential energy of the elastic main body 11 into an electrical signal and outputs it to the main control circuit board of the external device, thereby realizing pressure detection. The pressure sensor structure 100 provided by this application has a simple overall structure. Furthermore, by adding the abutment structure 12, the assembly precision between the elastic main body 11 and the external pressure-applying structure is reduced. The force applied by the pressure-applying structure is transmitted to the elastic main body 11 more quickly, and the deformation of the elastic main body 11 under force is more pronounced, which also improves the pressure sensing accuracy of the pressure sensor structure 100 to a certain extent.

[0041] Please refer to Figure 1 In one embodiment, the abutment structure 12 is located in the middle of the elastic main body portion 11.

[0042] Understandably, the middle part of the elastic main body 11 refers to the area of ​​the elastic main body 11 relative to its outer edge. The distance from this area to each outer edge is equal or substantially equal. By setting the abutment structure 12 in the middle part of the elastic main body 11, the elastic main body 11 can be subjected to more uniform force after being compressed.

[0043] Please refer to Figure 1In one embodiment, the abutment structure 12 includes a protrusion provided on the elastic body portion 11.

[0044] Understandably, a protrusion is a solid structure that protrudes from the surface of the elastic main body 11; that is, the protrusion has a certain height and is higher than the surface of the elastic main body 11. The structural forms of the protrusion include, but are not limited to, protruding pillars, protrusions, and protrusions.

[0045] In one embodiment, the number of protrusions is one, and the geometric center of the protrusion is located at the geometric center of the elastic body portion 11.

[0046] Understandably, the geometric center point of a protrusion is its central position. For example, if the protrusion is a cylindrical column, then its geometric center point is the position of the central axis of the cylindrical column. Similarly, the geometric center point of the elastic main body 11 is its central position. For example, if the elastic main body 11 is a square sheet, then its geometric center point is the intersection of the diagonals of the square sheet. This ensures that the elastic main body 11 experiences more uniform force when pressure is applied.

[0047] In one embodiment, the number of protrusions is at least two, and the midpoint of the line connecting the geometric center points of each protrusion coincides with the geometric center point of the elastic body portion 11.

[0048] Understandably, when there are two or more protrusions, the protrusions are required to be symmetrically arranged around the geometric center point of the elastic body 11, so as to ensure that the elastic body 11 is subjected to more uniform force when pressure is applied.

[0049] In one embodiment, the abutment structure 12 includes a recess formed by an indentation in the surface phase of the elastic body portion 11.

[0050] Understandably, a recess is a virtual structure that is recessed into the surface of the elastic main body 11. The structure of the recess includes, but is not limited to, pits, grooves, etc. In this embodiment, a protruding structure adapted to the recess can be provided on the pressure-applying structure to achieve the mating and fitting of the recess and the pressure-applying structure. In addition, it is necessary to adjust the depth of the recess and the protruding height of the protruding structure to adjust the assembly accuracy between the mating structure 12 and the pressure-applying structure, so as to reduce the assembly difficulty.

[0051] In one embodiment, the geometric center of the recess is located at the geometric center of the elastic body portion 11.

[0052] Understandably, the geometric center point of the concave part is the center position of the concave part. For example, when the concave part is a circular pit, its geometric center point is the center of the circular pit. Similarly, the geometric center point of the elastic body part 11 is its center position. For example, when the elastic body part 11 is a square sheet, its geometric center point is the intersection of the diagonals of the square sheet.

[0053] Please refer to the figure. In one embodiment, the pressure sensor structure 100 includes a diaphragm 30 disposed between the elastic body 11 and the flexible circuit board 20.

[0054] Understandably, the membrane layer 30 is used to connect the elastic main body 11 and the flexible circuit board 20, and to fill the gap between the elastic main body 11 and the flexible circuit board 20, so as to realize the transmission of force between the elastic main body 11 and the flexible circuit board 20 and improve the transmission efficiency.

[0055] Secondly, embodiments of this application also provide an electronic pressure pen, including the pressure sensor structure 100 as described above.

[0056] The electronic pressure pen provided by this utility model, based on the pressure sensor structure 100 described above, has lower assembly precision requirements and higher sensitivity.

[0057] Referring to the figure, in one embodiment, the electronic pressure pen also includes a pen tip 200 and an adapter circuit board 300. The pen tip 200 abuts against the abutment structure 12 of the pressure sensor structure 100, and the adapter circuit board 300 is electrically connected to the flexible circuit board 20 of the pressure sensor structure 100.

[0058] Understandably, the pen tip 200 is a pressure-applying structure used to transmit pressure to the elastic body 10 of the pressure sensor structure 100. Specifically, the pen tip 200 contacts the abutting structure 12 of the elastic body 10, causing the elastic main body 11 to deform. The flexible circuit board 20 converts the deformation potential energy of the elastic main body 11 into an electrical signal and transmits the electrical signal to the adapter circuit board 300.

[0059] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure sensor structure, characterized in that, include: An elastomer, the elastomer including an elastic body portion and an abutting structure disposed on the elastic body portion, the abutting structure being used to abut against an external pressure-applying structure; A flexible circuit board is disposed on the side of the elastic main body away from the abutting structure, and the flexible circuit board is used for electrical connection with the main control circuit board of an external device.

2. The pressure sensor structure according to claim 1, characterized in that, The abutment structure is located in the middle of the elastic main body.

3. The pressure sensor structure according to claim 1, characterized in that, The abutment structure includes a protrusion provided on the elastic main body.

4. The pressure sensor structure according to claim 3, characterized in that, The number of protrusions is one, and the geometric center point of the protrusion is located at the geometric center point of the elastic body.

5. The pressure sensor structure according to claim 3, characterized in that, The number of protrusions is at least two, and the midpoint of the line connecting the geometric center points of each protrusion coincides with the geometric center point of the elastic main body.

6. The pressure sensor structure according to claim 1, characterized in that, The abutting structure includes a recess formed by an indentation in the surface phase of the elastic main body.

7. The pressure sensor structure according to claim 6, characterized in that, The geometric center of the recess is located at the geometric center of the elastic body.

8. The pressure sensor structure according to any one of claims 1 to 7, characterized in that, The pressure sensor structure includes a membrane layer disposed between the elastic main body and the flexible circuit board.

9. An electronic pressure pen, characterized in that: Includes the pressure sensor structure as described in any one of claims 1 to 8.

10. The electronic pressure pen according to claim 9, characterized in that: The electronic pressure pen also includes a pen tip and an adapter circuit board. The pen tip abuts against the abutting structure of the pressure sensor structure, and the adapter circuit board is electrically connected to the flexible circuit board of the pressure sensor structure.

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