CN212391154U - Pressure sensing device and electronic equipment - Google Patents
Pressure sensing device and electronic equipment Download PDFInfo
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- CN212391154U CN212391154U CN202021024960.9U CN202021024960U CN212391154U CN 212391154 U CN212391154 U CN 212391154U CN 202021024960 U CN202021024960 U CN 202021024960U CN 212391154 U CN212391154 U CN 212391154U
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Abstract
The application belongs to the technical field of pressure detection, and particularly relates to a pressure sensing device and electronic equipment. In the pressure sensing device, the flexible sheet is provided with a first mounting area and a second mounting area, the pressure sensing circuit is provided with a first strain sensing resistor and a second strain sensing resistor, the first strain sensing resistor is positioned on a first surface of the first mounting area, the rigid support part is connected to a second surface of the flexible sheet corresponding to the first mounting area, and the elastic deformation part is arranged on the rigid support part. The pressure sensing device has simple structure and low cost; the structure strength is reliable, and the anti-drop coefficient is high. The pressure sensing device is applied to a to-be-measured piece, the first surface of the flexible sheet abuts against the to-be-measured piece, when the to-be-measured piece is stressed, the elastic deformation piece is compressed and deformed to generate elastic force, and the rigid supporting piece has a reaction force on the flexible sheet to enable the first mounting area of the flexible sheet to be greatly deformed. The pressure sensing circuit can output an electric signal to realize pressure sensing. The pressure sensing device is easy to install and high in sensitivity.
Description
Technical Field
The application belongs to the technical field of pressure detection, and particularly relates to a pressure sensing device and electronic equipment.
Background
The development of artificial intelligence enables the pressure sensing technology to be widely applied to various electronic devices, and the human-computer interaction and object-object interconnection level is greatly improved. However, with the continuous progress of the technology, the electronic device requires a compact external dimension of the pressure sensing device, and also requires higher installation accuracy and measurement accuracy to ensure the product quality and user experience.
Common pressure sensing technologies include MEMS (micro electro mechanical system) pressure sensor technology, pressure capacitance technology, and the like, in addition to conventional strain gauge technology. In the strain gauge technology, the strain gauge needs to be adhered to a specific structure, so that the structure requires a large space and has low sensitivity; the MEMS pressure technology generally needs to support the back of the MEMS device by means of an external object, in order to obtain a pressure signal when the device is deformed due to different strains of the sensor inside the device, but the back of the MEMS sensor and the support are separate components, which is difficult to meet the assembly consistency, the MEMS structure is fragile, and the drop resistance coefficient is low; the pressure capacitance technology needs to detect capacitance between surfaces, is complex to assemble and has high requirements on assembly precision and structural space. Without exception, the technologies have certain structural limitation on structural installation, and cannot realize consideration in multiple aspects such as easy installation, high sensitivity, high anti-falling coefficient and the like.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide a pressure sensing device and an electronic apparatus, so as to solve the technical problems that the existing pressure sensing device is difficult to be installed, high in sensitivity and high in drop resistance coefficient.
The embodiment of the application provides a pressure-sensitive device, includes:
the flexible sheet is provided with a first surface and a second surface which are opposite to each other, the first surface is used for abutting against the piece to be measured and can deform along with the piece to be measured, and the flexible sheet is provided with a first installation area and a second installation area which are arranged adjacently;
the pressure sensing circuit is mainly formed by connecting a first strain sensing resistor and a second strain sensing resistor, wherein the first strain sensing resistor is arranged on the first surface corresponding to the first mounting area and is used for detecting the deformation of the first mounting area;
the rigid supporting piece is connected to the second face corresponding to the first mounting area; and
the elastic deformation piece is arranged on one surface, back to the flexible sheet, of the rigid support piece, and the elastic deformation piece is set to generate compression deformation when the to-be-measured piece deforms.
Optionally, the first mounting area is provided with at least two first strain sensing resistors, the second mounting area is provided with at least two second strain sensing resistors, the pressure sensing circuit is a bridge circuit formed by connecting two of the first strain sensing resistors and two of the second strain sensing resistors, the two first strain sensing resistors are one pair of opposite bridge arms of the bridge circuit, and the two second strain sensing resistors are the other pair of opposite bridge arms of the bridge circuit.
Optionally, the number of the first mounting areas is one, the number of the second mounting areas is two, and the first mounting areas are located between two of the second mounting areas; each second mounting area is provided with one second strain sensing resistor.
Optionally, a predetermined angle is formed between the current direction of the first strain sensing resistor and the length direction of the flexible sheet, and a predetermined angle is formed between the current direction of the second strain sensing resistor and the length direction of the flexible sheet.
Optionally, the first mounting area is provided with at least two first strain sensing resistors, the first mounting area is provided with at least two second strain sensing resistors, the pressure sensing circuit is a bridge circuit formed by connecting two of the first strain sensing resistors and two of the second strain sensing resistors, the two first strain sensing resistors are one pair of opposite bridge arms of the bridge circuit, and the two second strain sensing resistors are the other pair of opposite bridge arms of the bridge circuit; the included angle between the current direction of the first strain sensing resistor and the length direction of the flexible sheet is 0-30 degrees; the included angle between the current direction of the second strain sensing resistor and the length direction of the flexible sheet is 60-90 degrees;
or the pressure sensing circuit is a series voltage dividing circuit formed by connecting one of the first strain sensing resistors and one of the second strain sensing resistors;
or, the pressure sensing circuit is a parallel shunt circuit formed by connecting one of the first strain sensing resistors and one of the second strain sensing resistors.
Optionally, the elastic deformation element is a spring sheet, a pogo pin or a solder ball.
Optionally, the flexible sheet and the rigid support are welded or glued.
Optionally, the flexible sheet is a glass fiber sheet, a plastic sheet, a glass sheet or a metal sheet;
optionally, the rigid support is a sheet of fiberglass, plastic, glass, or metal.
One or more technical solutions in the pressure sensing apparatus provided in the embodiment of the present application have at least one of the following technical effects: in the pressure sensing device, the flexible sheet is provided with a first mounting area and a second mounting area, the pressure sensing circuit is provided with a first strain sensing resistor and a second strain sensing resistor, the first strain sensing resistor is positioned on a first surface of the first mounting area, the rigid support part is connected to a second surface of the flexible sheet corresponding to the first mounting area, and the elastic deformation part is arranged on the rigid support part. The pressure sensing device has simple structure, small volume and low cost; the flexible sheet and the rigid support piece are combined into a whole, the structural strength is reliable, and the anti-falling coefficient is high. Be applied to this pressure sensing device and measure the volume spare with the volume spare that measures, the first face of flexible piece is supported with the volume spare top of measuring, and when the volume spare atress of measuring, the volume spare that measures receives pressure mainly transmits to the elastic deformation piece by the first installing zone of flexible piece, rigid support piece, and elastic deformation piece compression deformation produces elasticity, and rigid support piece has a reaction force to the flexible piece and makes the first installing zone of flexible piece take place great deformation, and the second installing zone deformation is very little. The first strain sensing resistor located in the first mounting area is in a stretching state, the resistance value is increased, and the pressure sensing circuit can output an electric signal capable of representing the stress of the to-be-measured part, so that pressure sensing is realized. The pressure sensing device is assembled to the electronic equipment through the elastic deformation piece, is easy to install and has high sensitivity.
The embodiment of the application provides an electronic equipment, including foretell forced induction device, to measure and measure an and locating part, to measure an with the locating part interval sets up, forced induction device locates to measure an with between the locating part, the first face top of flexible piece support in to measure an, the one end top of elastic deformation piece support in the locating part.
Optionally, the first surface of the flexible sheet is glued to the piece to be measured;
or the first surface of the flexible sheet is welded with the piece to be measured;
alternatively, the first face of the flexible sheet is attached to the element to be measured by surface assembly techniques.
One or more technical solutions in the electronic device provided in the embodiment of the present application have at least one of the following technical effects: the electronic equipment adopts the pressure sensing device, the pressure sensing device is arranged between the piece to be measured and the limiting part, and one end of the elastic deformation piece is abutted to the limiting part. When the piece to be measured is stressed, the pressure borne by the piece to be measured is mainly transmitted to the elastic deformation piece through the first mounting area of the flexible sheet and the rigid support piece, the limiting piece reacts on the elastic deformation piece, the elastic deformation piece is compressed and deformed to generate elastic force, the rigid support piece has reaction force on the flexible sheet to enable the first mounting area of the flexible sheet to be greatly deformed, and the second mounting area is deformed very little. The first strain sensing resistor located in the first mounting area is in a stretching state, the resistance value is increased, and the pressure sensing circuit can output an electric signal capable of representing the stress of the to-be-measured part, so that pressure sensing is realized. The pressure sensing device is assembled between the piece to be measured and the limiting piece through elastic deformation of the elastic deformation piece, is easy to install and has high sensitivity.
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 embodiments or the prior art descriptions will be briefly described 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 drawings based on these drawings without inventive exercise.
Fig. 1 is a perspective assembly view of a pressure sensing device provided in an embodiment of the present application;
FIG. 2 is an exploded perspective view of the pressure sensing device of FIG. 1;
FIG. 3 is a top view of the pressure sensing device of FIG. 1;
FIG. 4 is a schematic diagram of a pressure sensing circuit in the pressure sensing device of FIG. 1;
FIG. 5 is a schematic view of the assembly of the pressure sensing device of FIG. 1 with a member to be measured and a limiting member;
fig. 6 is a schematic view illustrating an assembly of a pressure sensing device, a to-be-measured member, and a limiting member according to another embodiment of the present disclosure;
fig. 7 is a schematic view illustrating an assembly of a pressure sensing device, a to-be-measured member, and a limiting member according to another embodiment of the present disclosure;
FIG. 8 is a perspective assembly view of a pressure sensing device according to another embodiment of the present application;
FIG. 9 is a perspective assembly view of a pressure sensing device according to another embodiment of the present application;
FIG. 10 is a schematic diagram of a pressure sensing circuit in the pressure sensing device of FIG. 9;
fig. 11 is a schematic diagram of another pressure sensing circuit in the pressure sensing device of fig. 9.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the embodiments of the present application, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like refer to orientations and positional relationships illustrated in the drawings, which are used for convenience in describing the embodiments of the present application and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the embodiments of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating 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 the present application, "a plurality" means two or more unless specifically limited otherwise.
In the embodiments of the present application, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
Referring to fig. 1, 2 and 5, an embodiment of the present application provides a pressure sensing apparatus, which includes a flexible sheet 10, a pressure sensing circuit, a rigid supporting member 20 and an elastic deformation member 30. The flexible sheet 10 has a first face 10a and a second face 10b opposite to each other, the first face 10a is used for abutting against the piece to be measured 1 and can deform along with the piece to be measured 1, the flexible sheet 10 has a first mounting area 11 and a second mounting area 12 which are adjacently arranged, and the first mounting area 11 and the second mounting area 12 are divided at different positions on a plane where the flexible sheet 10 is located. The pressure sensing circuit is mainly formed by connecting a first strain sensing resistor and a second strain sensing resistor. The first strain sensing resistor is arranged on the first surface 10a corresponding to the first mounting area 11 and is used for detecting the deformation of the first mounting area 11. The rigid support 20 is connected to the second face 10b in correspondence of the first mounting zone 11. The elastic deformation member 30 is disposed on a side of the rigid support member 20 opposite to the flexible sheet 10, and the elastic deformation member 30 is configured to generate compression deformation when the member to be measured 1 is deformed.
Compared with the related art, in the pressure sensing device, the flexible sheet 10 has the first mounting area 11 and the second mounting area 12, the pressure sensing circuit has the first strain sensing resistor and the second strain sensing resistor, the first strain sensing resistor is located on the first surface 10a of the first mounting area 11, the rigid support member 20 is connected to the second surface 10b of the flexible sheet 10 corresponding to the first mounting area 11, and the elastic deformation member 30 is arranged on the rigid support member 20. The pressure sensing device has simple structure, small volume and low cost; the flexible sheet 10 and the rigid support member 20 are integrated, so that the structural strength is reliable, and the anti-falling coefficient is high. Referring to fig. 5, when the pressure sensing device is applied to the device to be measured 1, the first surface 10a of the flexible sheet 10 abuts against the device to be measured 1, when the device to be measured 1 is stressed, the pressure applied to the device to be measured 1 is mainly transmitted to the elastic deformation member 30 through the first mounting area 11 of the flexible sheet 10 and the rigid support member 20, the elastic deformation member 30 is compressed and deformed to generate an elastic force, the rigid support member 20 has a reaction force on the flexible sheet 10 to deform the first mounting area 11 of the flexible sheet 10, and the second mounting area 12 is deformed very little. The first strain sensing resistor located in the first mounting area 11 is in a stretching state, and the resistance value is increased, and the pressure sensing circuit can output an electric signal capable of representing the stress of the to-be-measured element 1, so that pressure sensing is realized. The pressure sensing device structure is assembled to the electronic equipment through the elastic deformation piece 30, is easy to install, and is good in installation consistency and high in sensitivity.
The strain sensing resistor can be made of graphene, piezoelectric ceramics, MEMS, metal wires, silicon wafers and other materials. The strain sensitive resistors may be electrically connected to each other by various conductive materials such as copper, silver, and carbon paste.
The flexible sheet 10 may be a glass fiber sheet (FR4), a plastic sheet, a glass sheet, a metal sheet, or other sheet made of flexible material, and is selected as required.
The rigid support member 20 may be a glass sheet, a plastic sheet, a glass sheet or a metal sheet, or other structures made of rigid materials, and is selected according to the requirements. Wherein the metal sheet can be a steel sheet, an aluminum sheet, etc.
Referring to fig. 2 to 4, in another embodiment of the present application, the first mounting area 11 is provided with at least two first strain sensing resistors R2 and R3, the second mounting area 12 is provided with at least two second strain sensing resistors R1 and R4, the pressure sensing circuit is a bridge circuit formed by connecting two of the first strain sensing resistors R2 and R3 with two of the second strain sensing resistors R1 and R4, the two first strain sensing resistors R2 and R3 are one pair of opposite arms of the bridge circuit, and the two second strain sensing resistors R1 and R4 are the other pair of opposite arms of the bridge circuit. In a bridge circuit, two strain sensitive resistors as opposite arms are simultaneously increased or simultaneously decreased so that the bridge circuit can output an electrical signal. The deformation quantities of the two first strain sensing resistors R2 and R3 are relatively close to each other and are used as a pair of opposite bridge arms; and the deformation quantities of the two second strain sensing resistors R1 and R4 are relatively close to each other to form another pair of opposite bridge arms. Wherein, the second strain sensitive resistors R1, R4 may be disposed on the first side 10a or the second side 10b of the second mounting region 12.
In a bridge circuit composed of R1, R2, R3 and R4, an input voltage Ui, an output voltage Uo obtained across Vp and Vn, has an input-output voltage formula:
when the element 1 to be measured is deformed under force, the flexible sheet 10 deforms at the first mounting area 11 and the second mounting area 12 deforms very little. The two first strain sensing resistors R2 and R3 located in the first mounting region 11 are in a stretched state and have simultaneously increased resistance values, and the two second strain sensing resistors R1 and R4 located in the second mounting region 12 have smaller bending deformation and almost unchanged resistance values, so that the bridge circuit outputs an electric signal, and the characteristics of the pressure signal are analyzed to identify the acting force, thereby realizing pressure sensing.
Referring to fig. 2 and 3, in another embodiment of the present application, the number of the first mounting areas 11 is one, the number of the second mounting areas 12 is two, and the first mounting area 11 is located between two second mounting areas 12; the first mounting region 11 is provided with two first strain sensitive resistors R2, R3, and each second mounting region 12 is provided with one second strain sensitive resistor R1 (R4). Two ends of the first mounting area 11 are respectively provided with a second mounting area 12, each second mounting area 12 is respectively provided with a second strain sensing resistor R1(R4), and the pressure sensing device is stable and reliable in structure and small in occupied space by adopting the symmetrical layout mode. When the piece to be measured 1 is stressed, the second mounting areas 12 at both ends deform approximately the same, so that the changes of the second strain sensitive resistors R1, R4 on the two second mounting areas 12 are approximately the same, and thus the output of the bridge circuit is more accurate. And more modules can be conveniently arranged in one plane, so that the pressure detection at different positions is facilitated.
Referring to fig. 2 and 3, in another embodiment of the present application, the current directions of the first strain sensing resistors R2 and R3 form a predetermined angle with the length direction of the flexible sheet 10, and the current directions of the second strain sensing resistors R1 and R4 form a predetermined angle with the length direction of the flexible sheet 10. The longitudinal direction of the flexible sheet 10 is the left-right direction in fig. 3. The direction of the current of the strain sensitive resistor may be understood as the direction of extension of the strain sensitive resistor. When the pressure sensing device is deformed by a force, the first mounting region 11 of the flexible sheet 10 will have a larger deformation amount than the second mounting region 12, so that the first strain sensing resistors R2 and R3 located in the first mounting region 11 will have a larger deformation amount than the second strain sensing resistors R1 and R4 located in the second mounting region 12, so that the bridge circuit can output an electric signal, and the characteristics of the pressure signal can be analyzed to identify the acting force, thereby realizing the pressure sensing.
Illustratively, the current flow direction of the first strain sensing resistors R2 and R3 is parallel to the length direction of the flexible sheet 10, and the current flow direction of the second strain sensing resistors R1 and R4 is perpendicular to the length direction of the flexible sheet 10. The current directions of the strain sensitive resistors R2 and R3 are the left-right direction in fig. 3, and the current directions of the strain sensitive resistors R1 and R4 are the up-down direction in fig. 3. With this solution, the strain sensitive resistors R2, R3 of the first mounting region 11 will deform a greater amount when the device to be measured 1 is subjected to a force, while the strain sensitive resistors R1, R4 of the second mounting region 12 will deform a smaller amount, thereby making the output of the bridge circuit more accurate.
Referring to fig. 4 and 8, in another embodiment of the present application, the first mounting area 11 is provided with at least two first strain sensing resistors R2 and R3, the first mounting area 11 is provided with at least two second strain sensing resistors R1 and R4, the pressure sensing circuit is a bridge circuit formed by connecting two of the first strain sensing resistors R2 and R3 with two of the second strain sensing resistors R1 and R4, the two first strain sensing resistors R2 and R3 are one pair of opposite arms of the bridge circuit, and the two second strain sensing resistors R1 and R4 are the other pair of opposite arms of the bridge circuit. The included angle between the current direction of the first strain sensing resistors R2 and R3 and the length direction of the flexible sheet 10 is 0 ° to 30 °, i.e. parallel or at a smaller included angle. The current direction of the second strain sensitive resistors R1 and R4 is at an angle of 60 ° to 90 ° with respect to the length direction of the flexible sheet 10, i.e. perpendicular to each other or at a larger angle. In fig. 8, the longitudinal direction of the flexible sheet 10 is the left-right direction, and the width direction is the front-back direction. When the pressure sensing device is deformed under a force, the flexible sheet 10 has larger deformation in the length direction than in the width direction, so that the first strain sensing resistors R2 and R3 have larger deformation, and the second strain sensing resistors R1 and R4 have smaller deformation, so that a bridge circuit consisting of R1, R2, R3 and R4 can also output an electric signal, and the acting force can be identified by analyzing the characteristics of the pressure signal, thereby realizing pressure sensing. Wherein, the second strain sensitive resistors R1, R4 may be disposed on the first side 10a or the second side 10b of the second mounting region 12.
Referring to fig. 9 and 10, in another embodiment of the present application, the pressure sensing circuit is a series voltage divider circuit formed by connecting one of the first strain sensing resistors R2 and one of the second strain sensing resistors R1. The constant voltage source is adopted, input voltage Ui is applied to two ends of V + and V-, the potential at Vo is detected, or the output voltage Uo between Vo and the ground is measured, and an input-output voltage formula is provided:
when the element 1 to be measured is deformed under force, the flexible sheet 10 deforms at the first mounting area 11 and the second mounting area 12 deforms very little. The first strain sensing resistor R2 located in the first mounting region 11 is in a stretched state and has an increased resistance, and the second strain sensing resistor R1 located in the second mounting region 12 has a smaller bending deformation and has a nearly unchanged resistance, so that the series voltage dividing circuit outputs an electrical signal, and the acting force is identified by analyzing the characteristics of the pressure signal, thereby implementing pressure sensing.
Referring to fig. 9 and 11, in another embodiment of the present application, the pressure sensing circuit is a parallel shunt circuit formed by one of the first strain sensing resistors R2 and one of the second strain sensing resistors R1. The constant current source is adopted, the input current I is added at the I + and I-ends, the output current I1 on the R1 branch is measured, and the input and output current formula is as follows:
when the element 1 to be measured is deformed under force, the flexible sheet 10 deforms at the first mounting area 11 and the second mounting area 12 deforms very little. The first strain sensing resistor R2 located in the first mounting region 11 is in a stretched state and has an increased resistance, and the second strain sensing resistor R1 located in the second mounting region 12 has a smaller bending deformation and has a nearly unchanged resistance, so that the shunt circuit in parallel outputs an electrical signal, and the acting force is identified by analyzing the characteristics of the pressure signal, thereby implementing pressure sensing.
It will be appreciated that the pressure sensing circuit may be other types of circuits. When the element 1 to be measured is deformed under force, the flexible sheet 10 deforms at the first mounting area 11 and the second mounting area 12 deforms very little. The first strain sensing resistor located in the first mounting area 11 is in a stretching state, the resistance value is increased, the second strain sensing resistor is small in bending deformation, the resistance value is almost unchanged, the pressure sensing circuit can output an electric signal, and the pressure sensing can be realized by analyzing the characteristics of the pressure signal to identify the acting force.
In another embodiment of the present application, the flexible sheet 10 and the rigid support member 20 are tightly bonded by welding or gluing, so that the flexible sheet 10 and the rigid support member 20 are securely connected and can transmit the force.
When the elastic deformation element 30 is disposed, the elastic deformation element 30 may be a spring (as shown in fig. 5), a pogo pin (as shown in fig. 6) or a solder ball (as shown in fig. 7), and the elastic deformation element 30 may be compressed and deformed to generate an elastic force. When the part 1 to be measured is stressed, the pressure applied to the part 1 to be measured is mainly transmitted to the elastic deformation part 30 through the first mounting area 11 of the flexible sheet 10 and the rigid support part 20, the elastic deformation part 30 is compressed and deformed to generate elastic force, the rigid support part 20 has a reaction force on the flexible sheet 10 to deform the first mounting area 11 of the flexible sheet 10, and then the first strain sensing resistors R2 and R3 located in the first mounting area 11 are greatly deformed. Specifically, the elastic deformation member 30 may be fixed on a surface of the rigid support member 20 opposite to the flexible sheet 10 by a fastener or welding or other mechanical methods, so that the flexible sheet 10 provided with the first strain sensing resistor and the second strain sensing resistor, the rigid support member 20 and the elastic deformation member 30 are taken as an integral structure, which facilitates the integral installation of the pressure sensing device on the to-be-measured member 1.
Referring to fig. 5 to 7, in another embodiment of the present application, an electronic apparatus is provided, which includes the pressure sensing device, the to-be-measured element 1 and the limiting element 2 are disposed at an interval, the pressure sensing device is disposed between the to-be-measured element 1 and the limiting element 2, the first surface 10a of the flexible sheet 10 abuts against the to-be-measured element 1, and one end of the elastic deformation element 30 abuts against the limiting element 2.
The electronic equipment adopts the pressure sensing device, the pressure sensing device is arranged between the piece 1 to be measured and the limiting part 2, and one end of the elastic deformation piece 30 is abutted to the limiting part 2. When the part 1 to be measured is stressed, the pressure borne by the part 1 to be measured is mainly transmitted to the elastic deformation part 30 through the first installation area 11 of the flexible sheet 10 and the rigid support part 20, the limiting part 2 reacts on the elastic deformation part 30, the elastic deformation part 30 is compressed and deformed to generate elastic force, the rigid support part 20 has reaction force on the flexible sheet 10 to enable the first installation area 11 of the flexible sheet 10 to be greatly deformed, and the second installation area 12 is deformed very little. The first strain sensing resistor located in the first mounting area 11 is in a stretching state, and the resistance value is increased, and the pressure sensing circuit can output an electric signal capable of representing the stress of the to-be-measured element 1, so that pressure sensing is realized. The pressure sensing device is assembled between the piece to be measured 1 and the limiting piece 2 through elastic deformation of the elastic deformation piece 30, and is easy to install and high in sensitivity.
The position-limiting member 2 may be plate-shaped, and the rigid supporting member 20 is block-shaped. The rigid support 20 may be mounted to the stop 2 by a snap fit or other mechanical connection.
The electronic equipment can be TWS earphones, pressure pens, mobile phone side keys, display screens, hand rings and other consumer electronic equipment and industrial electronic equipment which need to use pressure sensing, and the electronic equipment adopting the pressure sensing device can realize pressure sensing.
By way of example, the piece to be measured 1 can be a touch screen, a display or other electronic device with a rigid structure. Through being connected pressure sensing device and the volume of awaiting measuring 1, can realize accurate discernment touch-control position accurate discernment touch-control pressure's size simultaneously, for electronic equipment has expanded application space in product application, man-machine interaction and consumption experience. The user can directly obtain the accurate pressure level and the accurate amount by touching and pressing the touch screen, the display or the electronic equipment.
Specifically, the to-be-measured part 1 can be a glass plate with the thickness of 1.1mm, and the glass plate is designed with the function of a touch screen; alternatively, the object 1 to be measured can be an LCD liquid crystal display or an OLED display screen with a thickness of 1.6 mm; alternatively, the piece to be measured 1 may be an electronic component having a touch function and a display function.
There are many possible implementations in achieving the connection of the flexible sheet 10 to the piece to be measured 1: the first realization mode is as follows: the first surface 10a of the flexible sheet 10 is bonded to the to-be-measured component 1, and may be specifically bonded by using a double-sided adhesive tape, an epoxy adhesive film, a 502 adhesive tape, a thermosetting adhesive tape, a silicone adhesive, an Anisotropic Conductive Film (ACF), or a similar material. The second implementation mode is as follows: the first surface 10a of the flexible sheet 10 is welded to the object 1 to be measured, and specifically, hot-pressing tin-melting welding or other welding methods can be used. The third implementation mode is as follows: the first face 10a of the flexible sheet 10 is connected to the member to be measured 1 by Surface Mount Technology (SMT), which facilitates mass production. In this way, when the object 1 to be measured is stressed, the stress of the object 1 to be measured can be transmitted to the flexible sheet 10, so that the first mounting region 11 of the flexible sheet 10 is bent, and the second mounting region 12 is deformed slightly.
The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed.
Claims (10)
1. A pressure sensing device, comprising:
the flexible sheet is provided with a first surface and a second surface which are opposite to each other, the first surface is used for abutting against the piece to be measured and can deform along with the piece to be measured, and the flexible sheet is provided with a first installation area and a second installation area which are arranged adjacently;
the pressure sensing circuit is mainly formed by connecting a first strain sensing resistor and a second strain sensing resistor, wherein the first strain sensing resistor is arranged on the first surface corresponding to the first mounting area and is used for detecting the deformation of the first mounting area;
the rigid supporting piece is connected to the second face corresponding to the first mounting area; and
the elastic deformation piece is arranged on one surface, back to the flexible sheet, of the rigid support piece, and the elastic deformation piece is set to generate compression deformation when the to-be-measured piece deforms.
2. The pressure sensing device of claim 1, wherein said first mounting area has at least two of said first strain-sensing resistors, said second mounting area has at least two of said second strain-sensing resistors, said pressure sensing circuit is a bridge circuit formed by two of said first strain-sensing resistors connected to two of said second strain-sensing resistors, and wherein two of said first strain-sensing resistors are one of a pair of opposing legs of said bridge circuit and two of said second strain-sensing resistors are the other of a pair of opposing legs of said bridge circuit.
3. The pressure sensing device of claim 2, wherein the number of first mounting areas is one and the number of second mounting areas is two, the first mounting area being located between two of the second mounting areas; each second mounting area is provided with one second strain sensing resistor.
4. The pressure sensing device of claim 2, wherein the first strain sensitive resistor has a current direction that is at a predetermined angle to the length direction of the flexible sheet, and the second strain sensitive resistor has a current direction that is at a predetermined angle to the length direction of the flexible sheet.
5. The pressure sensing device of claim 1, wherein said first mounting area has at least two of said first strain-sensing resistors, said first mounting area has at least two of said second strain-sensing resistors, said pressure sensing circuit is a bridge circuit formed by two of said first strain-sensing resistors connected to two of said second strain-sensing resistors, and wherein two of said first strain-sensing resistors are one of a pair of opposing legs of said bridge circuit and two of said second strain-sensing resistors are the other of a pair of opposing legs of said bridge circuit; the included angle between the current direction of the first strain sensing resistor and the length direction of the flexible sheet is 0-30 degrees; the included angle between the current direction of the second strain sensing resistor and the length direction of the flexible sheet is 60-90 degrees;
or the pressure sensing circuit is a series voltage dividing circuit formed by connecting one of the first strain sensing resistors and one of the second strain sensing resistors;
or, the pressure sensing circuit is a parallel shunt circuit formed by connecting one of the first strain sensing resistors and one of the second strain sensing resistors.
6. The pressure sensing device of any one of claims 1 to 5, wherein the elastic deformation element is a spring plate, a pogo pin or a solder ball.
7. A pressure sensing apparatus according to any of claims 1 to 5, wherein the flexible sheet is welded or glued to the rigid support member.
8. A pressure sensing device according to any of claims 1 to 5, wherein the flexible sheet is a sheet of fiberglass, plastic, glass or metal;
and/or the rigid support member is a glass fiber sheet, a plastic sheet, a glass sheet or a metal sheet.
9. An electronic device, comprising the pressure sensing device, the to-be-measured member, and the limiting member according to any one of claims 1 to 8, wherein the to-be-measured member and the limiting member are disposed at an interval, the pressure sensing device is disposed between the to-be-measured member and the limiting member, the first surface of the flexible sheet abuts against the to-be-measured member, and one end of the elastic deformation member abuts against the limiting member.
10. The electronic device of claim 9, wherein the first face of the flexible sheet is glued to the part to be measured;
or the first surface of the flexible sheet is welded with the piece to be measured;
alternatively, the first face of the flexible sheet is attached to the element to be measured by surface assembly techniques.
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| CN202021024960.9U CN212391154U (en) | 2020-06-05 | 2020-06-05 | Pressure sensing device and electronic equipment |
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| CN202021024960.9U CN212391154U (en) | 2020-06-05 | 2020-06-05 | Pressure sensing device and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213022A1 (en) * | 2022-05-05 | 2023-11-09 | 宁德时代新能源科技股份有限公司 | Strain detection assembly, battery, and electric device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023213022A1 (en) * | 2022-05-05 | 2023-11-09 | 宁德时代新能源科技股份有限公司 | Strain detection assembly, battery, and electric device |
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