CN113503808B - Forced induction structure suitable for curved surface deformation detects - Google Patents
Forced induction structure suitable for curved surface deformation detects Download PDFInfo
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- CN113503808B CN113503808B CN202110838997.8A CN202110838997A CN113503808B CN 113503808 B CN113503808 B CN 113503808B CN 202110838997 A CN202110838997 A CN 202110838997A CN 113503808 B CN113503808 B CN 113503808B
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- pressure sensing
- sensing part
- pressing
- pressing panel
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
- G01B7/20—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance formed by printed-circuit technique
Abstract
The application provides a pressure sensing structure suitable for curved surface deformation detection, which is characterized by comprising a pressing panel, a pressure sensing part and a fastening piece; the pressing panel is provided with a concave surface and a convex surface corresponding to the concave surface, the convex surface receives pressing of a user, the pressure sensing part is arranged on one side where the concave surface is located, the concave surface of the pressing panel extends towards the pressure sensing part for a preset length to form at least one installation part, two sides of the pressure sensing part respectively abut against the pressing panel, and the fastener abuts against the pressure sensing part and is matched with the installation part to clamp and fix the pressure sensing part; along the pressing direction, the position of the pressure sensing part abutting against the pressing panel is located below the clamped and fixed position of the pressure sensing part, and the pressure sensing part is in an arc shape with a preset curvature. The pressure sensing structure has the advantages that the output signal is large, the influence of the assembly tolerance of the pressure sensing part on the signal value is small, and the linearity between the output signal and the received pressure is good.
Description
Technical Field
The application belongs to the forced induction field, and more specifically says so and relates to a forced induction structure suitable for curved surface deformation detects.
Background
Be provided with the pressure on the traditional electronic product and feel the structure in order to realize the concrete function control of electronic product, along with electronic product's thickness size is more and more thin for the design space of the pressure structure that directly influences user's impression also more and more receives the restriction, if under the fixed not good or sensitivity lower condition of pressure structure, can lead to electronic product's performance to descend, influences the user and uses under the limited space condition.
Therefore, in order to provide a better pressing function and adapt to a scene with high requirements on an installation space, a pressure sensing technology adopted in the prior art is generally to attach a pressure sensing structure to a pressing panel to be detected so as to detect the deformation of the pressing panel generated when the pressing panel is under the pressure action, and a pressure sensing part corresponds to an output voltage signal by detecting the deformation. However, for non-planar positions where the installation space of the pressing panel or the pressure sensing structure is narrow, such as structures with curved surfaces like toothbrush handles, earphone handles and mobile phone sides, the existing method of bonding the pressure sensing structure is limited, the deformation of the pressing panel cannot be well transmitted to the pressure sensing structure, and the pressure sensing structure may not work normally.
Therefore, in order to enable the pressure sensing structure to detect the deformation of the pressing panel under the acting force, the prior art adopts the mode of the thimble 2 to transmit the deformation of the pressing panel 1 to the pressure sensing portion 3, specifically referring to the initial state of fig. 1 and the schematic diagram of the change of the pressure sensing portion when pressing in fig. 2, when the pressing panel 1 is stressed, the thimble 2 transmits the deformation of the pressing panel 1 to the pressure sensing portion 3, and the corresponding pressure sensing portion 3 generates deformation. However, there are some disadvantages in the assembly of this solution, because the thimble needs to be fixed in the slot 4 of the concave surface of the pressing panel first, and then the pressure sensing portion 3 is disposed below the thimble 2, so that there is a gap between the pressure sensing portion 3 and the thimble 2 or the length of the portion of the thimble 2 protruding out of the slot 4 is difficult to control, resulting in inconsistency of output signals in different pressure sensing structures, for example, a user presses the pressing panel 1, but due to assembly tolerance, the thimble 2 does not transmit force to the pressure sensing portion 3, the pressure sensing portion 3 does not deform, and at this time, the pressure sensing portion 3 does not output a voltage signal. In this embodiment, the pressure sensitive portion 3 is not deformed in the initial state, and thus the linearity of the output signal is low when the pressing force is small.
Therefore, in the prior art, due to structural limitation, the pressure sensing structure is not suitable for a scene with high requirement on an installation space, so that the application of the pressure sensing structure is limited, which is not beneficial to miniaturization of electronic equipment, or due to the fact that the pressure sensing structure for curved surface deformation detection is easily affected by tolerance in the assembly process, signals are inconsistent or linearity is poor; or the output signal value is small because the pressure sensing portion variable is small.
Based on this, in the pressure sensing field, it is highly desirable to have a pressure sensing structure that has a large output signal, a small influence of the assembly tolerance of the pressure sensing portion on the signal value, and a good linearity between the output signal and the received pressure, on the basis of being suitable for the curved surface deformation detection.
Disclosure of Invention
Based on this, in order to solve the problems in the prior art mentioned in the background section, a pressure sensing structure suitable for curved surface deformation detection is proposed, which can at least solve the problems in the background section, and specifically, the pressure sensing structure sequentially includes:
a pressing panel, a pressure sensing part, a fastening piece,
the pressing panel is provided with a concave surface and a convex surface corresponding to the concave surface, the convex surface receives the pressing of a user, the pressure sensing part is arranged on one side where the concave surface is positioned,
the concave surface of the pressing panel extends towards the pressure sensing part for a preset length to form at least one mounting part,
two sides of the pressure sensing part respectively abut against the pressing panel, the fastening pieces abut against the pressure sensing part, and each fastening piece is matched with each mounting part to clamp and fix the pressure sensing part;
along the pressing direction, the position of the pressing panel abutted to the pressure sensing part is located below the clamped and fixed position of the pressure sensing part, and the pressure sensing part is in an arc shape with a preset curvature.
In this scheme, press the panel and receive user's the operation of pressing, specifically for the convex surface that carries on the back mutually with the concave surface receives the power, press the panel and produce the deformation, should warp and transmit to the forced induction portion of being fixed by installation department and fastener centre gripping through the formation installation department that the concave surface extends, the degree of curvature or the deformation volume change of forced induction portion to the induced voltage of output changes, establishes the relation of the induced voltage of atress size and output, thereby, can be according to the interactive function of the correspondence that the atress size set up. Because under initial condition, the pressure sensing part adopts the fixed mode of centre gripping, and the position of the both sides that support with pressure sensing part and pressing panel is not located the coplanar with pressure sensing part by centre gripping fixed department. Thereby there is great crooked degree or deformation volume in forced induction portion, produces deformation at curved pressing panel atress to transmit power to forced induction portion through the installation department, thereby lead to the crooked degree to diminish the back, forced induction portion output signal's change is obvious, and sensitivity is higher. In addition, the fixed part of the pressure sensing part is always in contact with the installation part of the transmission force, so that when the pressing panel is acted by force and the transmission force of the installation part is transmitted to the pressure sensing part, the deformation of the pressure sensing part is influenced by the assembly tolerance, namely, the output signal is slightly influenced by the assembly tolerance, and the consistency of the output signal between the pressure sensing structures is good.
Optionally, the clamped and fixed position of the pressure sensing part is the middle part of the pressure sensing part.
Optionally, when the pressing panel receives a user pressing, the degree of curvature of the pressure sensing portion is reduced, and the curvature is reduced.
Optionally, a connecting line of two sides of the concave surface of the pressing panel abutted to the pressure sensing part is perpendicular to the length direction of the mounting part.
Optionally, the mounting portion is a stud, the fastener is a screw, the pressure sensing portion is provided with at least one through hole matched with the screw, the screw penetrates through the through hole to abut against the pressure sensing portion, and the mounting portion is screwed into the mounting portion to clamp and fix the pressure sensing portion.
Optionally, the pressure sensing portion includes a stiffening plate and a pressure sensing module, the pressure sensing module includes a circuit substrate and at least one stress detection unit located on the circuit substrate, the stiffening plate is provided with a stress concentration area, and the stress detection unit corresponds to the stress concentration area.
Optionally, the cross section of the stress concentration groove is U-shaped, or the cross section of the stress concentration groove is V-shaped; or the cross section of the stress concentration groove is in a sawtooth shape.
Other aspects and features of the present application will become apparent to those ordinarily skilled in the art upon review of the following description of specific embodiments of the application in conjunction with the accompanying figures.
Drawings
FIG. 1 is a schematic diagram of an initial state of a pressure sensing structure suitable for curved surface deformation detection in the prior art;
FIG. 2 is a diagram of a pressure sensing structure suitable for curved surface deformation detection under stress in the prior art;
FIG. 3 is a schematic view of an initial state of a pressure sensing structure according to an embodiment of the present application;
FIG. 4 is a schematic view of a pressure sensing structure under stress according to an embodiment of the present disclosure;
fig. 5 is a schematic view of a pressure sensing portion of a pressure sensing structure according to an embodiment of the present disclosure;
fig. 6 is another schematic view of a pressure sensing portion in a pressure sensing structure according to an embodiment of the present disclosure.
Description of the main elements
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| Convex |
101 |
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| Pressure sensing |
20 |
| Fastening |
30 |
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| Through |
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204 |
Detailed Description
In order to make the objects, principles, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are for purposes of illustration and not limitation, as will be set forth in the context of the present application.
It should be noted that, according to the connection or the position relationship that can be determined by the text or technical content of the specification, a part of the omitted or not drawn position change diagram is omitted for the simplicity of drawing, the omitted or not drawn position change diagram is not explicitly described in the specification, and cannot be considered as being omitted.
Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number and order of the indicated features.
It should be noted that the pressure sensing structure proposed in the present application is suitable for a scene that outputs a corresponding electrical signal according to the magnitude of the pressure applied to the pressure sensing structure. Thereby make the user through applying the different pressure of forced induction structure, correspond the external control mainboard and through handling this signal of telecommunication and according to the signal of telecommunication after handling, send corresponding control command, and then realize the mutual function of forced induction structure. Therefore, the pressure sensing structure provided by the application is suitable for the curved surface deformation detection and is also suitable for the scenes with the interactive function realized by pressing, including but not limited to the application scenes of a side key of a mobile phone, a button-free earphone handle, a toothbrush handle interactive design and the like.
In a typical application scenario, for a real wireless earphone, since an assembly space for functional elements such as in-ear detection, sound pickup, virtual sound effect, health assistance and the like is also required to be reserved in an earphone housing, the requirement on the assembly accuracy of each functional module is high, and therefore, the design of a pressure sensing structure needs to reduce assembly errors and enhance signal detection as much as possible so as to realize normal work. In addition, the stability of the designed pressure sensing structure is also considered, namely, in the process of mass production, the consistency of output signals among different pressure sensing structures is better.
Based on this, refer to fig. 3 and fig. 4, which are schematic diagrams illustrating an initial state of the pressure sensing structure 1 and a deformation of the pressing panel 10 after being stressed, which are suitable for curved surface deformation detection according to the present application. Specifically, referring to fig. 3, the pressure sensing structure 1 sequentially includes:
a pressing panel 10, a pressure sensing part 20, a fastening member 30;
the pressing panel 10 has a concave surface 102 and a convex surface 101 corresponding to the concave surface 102, the convex surface 101 receives the pressing of the user, and the pressure sensing part 20 is arranged on the side where the concave surface 102 is located;
it can be understood that the pressing panel 10 is a curved panel, and the side facing the opening formed by bending is the side where the pressure sensing part 20 is located; considering the interactive implementation of the blind operation by the user, for the convex surface 101 as the force receiving portion, in some embodiments, the convex surface 101 may be set to have a generally trapezoidal form as a whole, and the upper bottom of the trapezoid is the pressing area, so that the finger can easily identify the pressing area when pressing the key.
The concave surface 102 of the pressing panel 10 extends a predetermined length towards the pressure sensing part 20 to form at least one mounting part 103, and in combination with the above, preferably, the mounting part 103 corresponds to the position of the pressing area, that is, the mounting part 103 is formed by extending a predetermined length of the concave surface 102 corresponding to the convex surface 101 where the pressing area is located; for the direction of extension, it is preferred that it is perpendicular to the tangent plane of the pressing area. Alternatively, the mounting portion 103 may be formed integrally with the pressing panel 10 by injection molding, and the mounting portions 103 of different pressing panels 10 have good length consistency for a batch of injection molded pressing panels 10.
The two sides of the pressure sensing part 20 respectively abut against the pressing panel 10, the fasteners 30 abut against the pressure sensing part 20, and each fastener 30 and each mounting part 103 are matched to clamp and fix the pressure sensing part 20, that is, the clamped and fixed part of the pressure sensing part 20 is pressed between the fastener 30 and the mounting part 103.
In the pressing direction, the position abutting the pressure sensitive part 20 against the pressing panel 10 is located below the position where the pressure sensitive part 20 is sandwiched and fixed, and the pressure sensitive part 20 has an arc shape having a predetermined curvature.
It should be noted that, in the present application, when the pressure-sensitive portion 20 is clamped and fixed by the fastening member 30 and the mounting member, the concave surface 102 of the pressing panel 10 is pressed against both sides of the pressure-sensitive portion 20 abutting against the concave surface 102 of the pressing panel 10, and both sides contact with the concave surface 102 and have a certain elastic holding force, that is, on the basis that the pressure-sensitive portion 20 has an arc shape with a predetermined curvature, both sides of the pressure-sensitive portion 20 abut against the concave surface 102 and have a certain elastic holding force. Generally, the pressing direction is parallel to the longitudinal direction of the mounting portion 103.
In combination with the assembling process, in order to make the pressure sensing part 20 clamped and fixed at the mounting part 103 and in an arc shape, optionally, the width of the pressure sensing part 20 is greater than the length of a chord in the pressing panel 10, which is perpendicular to the length direction of the mounting part 103 and passes through the extending end of the mounting part 103, so that the fastening member 30 presses the pressure sensing part 20 and cooperates with the mounting part 103, when the pressure sensing part 20 is clamped and fixed, the pressure sensing part 20 deforms to form an arc shape with a predetermined curvature; and both sides of the pressure sensitive part 20 are brought into contact with the concave surface 102 while having a certain elastic holding force.
Note that, the width of the pressure sensing part 20 refers to the width when the pressure sensing part is not deformed, or the width when the pressure sensing part is not fixed, and cannot be understood as the length of the connection line between the two sides of the pressure sensing part 20 after the pressure sensing part 20 shown in fig. 3 or 4 is fixed; it should be understood that the pressure sensing part 20 is a flat and straight part when not assembled with other parts as a separate part, and AB shown in fig. 5 or 6 is the width of the pressure sensing part 20, so that the fastening member 30 presses the pressure sensing part 20 toward the mounting part 103, and during the bending deformation of the pressure sensing part 20, both sides of the pressure sensing part 20 always press against the concave surface 102 and there is an interaction force.
Of course, the present application does not exclude the case where the pressure sensing part 20 is formed as a separate component which is already curved with a certain degree of curvature when not assembled with other components, and the degree of curvature is larger after the fixing.
It can be understood that the curvature of the pressure sensing part 20, which is in the shape of an arc after being clamped and fixed, depends on the difference between the width of the pressure sensing part 20 and the length of a chord in the pressing panel 10, which is perpendicular to the length direction of the mounting part 103 and passes through the end of the mounting part 103, and the larger the difference, the larger the curvature of the arc. The length of the string passing through the end of the mounting portion 103 perpendicular to the length direction of the mounting portion 103 in the pressing panel 10 depends on the length of the mounting portion 103, for example, the longer the length of the mounting portion 103, the longer the length of the string, the longer the width of the pressure-sensitive portion 20 is required to maintain a certain difference.
Further, for the pressure sensing part 20 with a certain width, the shorter the length of the mounting portion 103 is, the farther the clamped and fixed position of the pressure sensing part 20 is from the connecting line between the two sides of the abutting concave surface 102, that is, the greater the bending degree of the pressure sensing part 20 after being clamped and fixed is, the more sensitive the arc-shaped pressure sensing part 20 has and the output signal is large, and the pressure sensing structure 1 can be pressed under a smaller acting force, thereby realizing the control of the corresponding component.
It should be noted that, the pressure sensing part 20 usually includes a circuit board, and the curvature also takes the bending limit of the pressure sensing part 20 into consideration, that is, a person skilled in the art can select a proper curvature within the bending limit of the pressure sensing part 20, that is, a proper difference between the width of the pressure sensing part 20 and the length of a chord passing through the end of the mounting part 103 and perpendicular to the length direction of the mounting part 103 in the pressing panel 10, so as to determine the width of the pressure sensing part 20 and the length of the mounting part 103. It can also be understood that, in the present application, the width of the pressure sensing part 20 is not limited to a specific value, and only the aforementioned constraints need to be satisfied, so that in the case of a limited installation space, the width of the pressure sensing part 20 can be set to be smaller, thereby leaving other space for installing other functional modules in an electronic device, such as an earphone. Compared with the existing mode of adopting the thimble, the pressure sensing part is generally suitable for installation in the circular cavity, the width of the pressure sensing part 20 is generally the diameter of the circular cavity, and the thimble occupies a larger internal space.
Then, under the condition that the pressure sensing portions 20 with the determined widths, the determined lengths of the installation portions 103, and the determined positions of the pressure sensing portions 20 are fixed, as long as the pressure sensing portions 20 are ensured to be tightly attached to the installation portions 103, the curvature errors of the pressure sensing portions 20 of different pressure sensing structures 1 are small, and the installation portions 103 of the pressure sensing structures 1, which transmit the acting force applied to the pressing panel 10, are always in contact with the pressure sensing portions 20, that is, as long as the pressing panel 10 is acted by force, the pressure sensing portions 20 can always generate corresponding deformation, the sensitivity of the pressure sensing structure 1 is high, the assembly errors between the pressure sensing structures 1 assembled in the same batch have small influence on the consistency between the pressure sensing structures 1, for example, under the same force, the difference of output signals of different pressure sensing structures 1 is small.
Preferably, in order to make the deformation of the pressure sensing part 20 from two sides to the fixed position uniformly change when the pressure sensing part is acted by the force transmitted by the mounting part 103, or the force applied to the two sides uniformly, the fixed position of the pressure sensing part 20 is clamped to be the middle of the pressure sensing part 20, i.e. the half of the width of the pressure sensing part, and it can be understood that the width here satisfies the aforementioned definition. Therefore, the line connecting the two sides of the pressure sensing part 20 is perpendicular to the length direction of the mounting part 103, i.e. the two sides of the pressure sensing part 20 abutting against the concave surface 102 of the pressing panel 10 are equal in height. Generally, the pressure sensing part 20 is clamped and fixed at the middle of the pressure sensing part 20, the fastening member 30 is pressed against the pressure sensing part 20 and fixed under the condition of the determined width of the pressure sensing part 20, and both sides of the pressure sensing part 20 are equal in height when the pressing panel 10 is bent to form a part of an arc of a single circle with a predetermined radius.
When the pressing panel 10 receives the pressing of the user, the bending degree of the pressure sensing part 20 is reduced, that is, the curvature is reduced, the distance between the fixed position of the pressure sensing part 20 and the connecting line at the two sides of the fixed position is shortened, the deformation of the pressure sensing part 20 is reduced, the output voltage of the pressure sensing part 20 is changed, the external control circuit board processes the output voltage signal, and executes a corresponding instruction according to the processed signal. Since the pressure sensing part 20 has initial deformation and is in constant contact with the mounting part 103 in the initial state, the linearity of the relationship between the output voltage and all the pressures of the pressing panel 10 is better. The output voltage of the pressure sensing part 20 does not change or changes little after the pressing panel 10 is stressed due to the assembly tolerance in the prior art. In addition, in the initial state of the pressure sensing part 20, that is, in the state where the pressure sensing part 20 is fixedly attached to the attachment part 103 by the fastening member 30, the degree of bending is large, and in the initial state, the output signal of the pressure sensing part 20 is large, the curved pressing panel 10 is deformed by a force, and the force is transmitted to the pressure sensing part 20 through the attachment part 103, so that the degree of bending becomes small, and then the change of the output signal of the pressure sensing part 20 becomes remarkable, and the sensitivity is high.
With respect to the form of the fastening member 30 and the mounting portion 103, it is sufficient that the pressure sensitive portion 20 is clamped therebetween, so that there is a height difference between a fixing position of the pressure sensitive portion 20 and a position abutting against the pressing panel 10 in the pressing direction, and the pressure sensitive portion 20 has a deformation in an initial state. For example, in one embodiment, the mounting portion 103 is a stud, the fastener 30 is a screw, the pressure sensing portion 20 is provided with at least one through hole 203 matching with the screw, the screw passes through the through hole 203 and presses against the pressure sensing portion 20, and the screw is gradually screwed into the mounting portion 103 until there is no gap between the end of the mounting portion 103 extending and the pressure sensing portion 20, so as to clamp and fix the pressure sensing portion 20. Or the mounting part 103 is a pin bush, the fastener 30 is a pin, the pressure sensing part 20 is provided with at least one through hole 203 matched with the pin, and the pin penetrates through the through hole 203 and is in interference fit with the pin bush; or the mounting part 103 is a rivet column, the fastener 30 is a rivet, the pressure sensing part 20 is provided with at least one through hole 203 matched with a screw, and the rivet penetrates through the through hole 203 and is in interference fit with the rivet column; or the fastener 30 is a wedge-shaped block, the installation part 103 is a wedge-shaped base matched with the wedge-shaped block, and the wedge-shaped block is in interference fit with the wedge-shaped base.
As for the structure of the pressure sensing portion 20, referring to fig. 5, optionally, the pressure sensing portion 20 includes a reinforcing plate 202 and a pressure sensing module 201, the pressure sensing module 201 includes a circuit board and at least one stress detection unit (not shown) located on the circuit board (not shown), the reinforcing plate 202 is provided with a stress concentration region, and the stress detection unit corresponds to the stress concentration region, or it can be understood that the stress detection unit is located in the stress concentration region, so as to improve the sensitivity of the pressure sensing portion 20 in detecting the deformation of the curved pressing panel 10. The stress detection unit can detect the deformation of the pressure sensing part 20 and output an electric signal, and the external control main board performs amplification, noise reduction and other processing on the electric signal at least, so as to obtain the pressure applied to the corresponding pressing panel 10.
Optionally, the stress detection unit is made of sensing resistor ink, and more specifically, four sensing resistors may form a bridge circuit, and generally, the larger the deformation amount of the pressure sensing portion 20 is, that is, the larger the curvature of the pressure sensing portion 20 is, the longer the sensing resistor is stretched, and the larger the output electrical signal is. Correspondingly, the Circuit board is a Flexible Printed Circuit (FPC), and then, for the pressure-sensitive module 201, it can be manufactured by printing a sensing resistor on the Flexible Circuit board.
Of course, in the case that a plurality of mounting portions 103 are provided, referring to fig. 6, the pressure sensing portion 20 is correspondingly provided with a plurality of through holes 203, the through holes 203 are symmetrically distributed on two sides of the pressure sensing module 201, and a connecting line of the through holes 203 on the two sides is perpendicular to the width direction of the pressure sensing portion 20, so as to facilitate the arrangement of the stress detection unit; specifically, since the deformation amount in the width direction of the pressure sensing portion 20 is larger when a force is applied to the pressure sensing portion, the stress detection unit is provided in a direction parallel to the width direction of the pressure sensing portion 20, that is, when the length direction of the corresponding resistor is parallel to the width direction, the tensile amount of the resistor is larger, the output induced electrical signal is larger, and the detection and measurement of the deformation amount are more facilitated.
Alternatively, regarding the internal structure of the pressure sensing portion 20, the pressure sensing module 201 is fixed to the reinforcing plate 202 by hot pressing, and it is preferable that the stress concentration region corresponds to the position of the pressing region, or projections of the stress detection unit, the stress concentration region, and the pressing region substantially overlap each other in the pressing direction.
Optionally, a stress concentration groove 204 is disposed in the stress concentration region, and the stress concentration groove 204 extends inward from an end of the stiffening plate 202 in the width direction thereof, and may or may not penetrate through the thickness of the stiffening plate 202; the stress detection unit is disposed between a corresponding plurality of the stress concentration grooves 204.
Specifically, two stress concentration grooves 204 are symmetrically arranged in the stress concentration region along the width direction of the circuit substrate, and the centers of the two stress concentration grooves 204 are collinear;
the cross section of the stress concentration groove 204 is U-shaped, and the stress detection unit is arranged between the sharp tops of the two U-shaped stress concentration grooves 204; or the like, or a combination thereof,
the cross section of the stress concentration groove 204 is V-shaped, and the stress detection unit is arranged between the sharp tops of the two V-shaped stress concentration grooves 204; or the like, or a combination thereof,
the cross section of the stress concentration groove 204 is in a sawtooth shape, and the stress detection unit is arranged between the sharp tops of the sawtooth-shaped stress concentration groove 204.
It should be noted that, in the present embodiment, the size of the stress concentration groove 204 is not particularly limited, and it is obvious to those skilled in the art that the size can be set according to actual needs.
In the present invention, the pressing panel 10 receives the pressing operation of the user, specifically, the convex surface 101 opposite to the concave surface 102 receives the force, the pressing panel 10 generates deformation, the deformation is transmitted to the pressure sensing part 20 clamped and fixed by the mounting part 103 and the fastener 30 through the mounting part 103 formed by the extension of the concave surface 102, the bending degree or deformation amount of the pressure sensing part 20 changes, so that the output induced voltage changes, and the relationship between the magnitude of the stress of the pressing panel 10 and the output induced voltage is established. Thus, the corresponding interactive function can be set according to the stress. Since in the initial state, the pressure sensing portion 20 is clamped and fixed, and the positions of the two sides of the pressure sensing portion 20 abutting against the pressing panel 10 and the clamped and fixed position of the pressure sensing portion 20 are not located on the same plane, specifically referring to fig. 3 and 4, the position of the pressure sensing portion 20 abutting against the pressing panel 10 is located below the clamped and fixed position of the pressure sensing portion 20 along the pressing direction; therefore, the pressure sensing part 20 has a large bending degree or deformation amount in the initial state, the output signal of the pressure sensing part 20 corresponding to the initial state is large, the curved pressing panel 10 is stressed to deform, and the force is transmitted to the pressure sensing part 20 through the mounting part 103, so that the change of the output signal of the pressure sensing part 20 is obvious after the bending degree becomes small, and the sensitivity is high.
In addition, the fixed part of the pressure sensing part 20 is always in contact with the mounting part 103 for transmitting the force, so when the pressing panel 10 is acted by the force and the mounting part 103 transmits the force to the pressure sensing part 20, the deformation of the pressure sensing part 20 is influenced by the assembly tolerance, that is, the influence of the assembly tolerance on the output signal is small, and the consistency of the output signal between the pressure sensing structures 1 is good.
It should be noted that, in the foregoing embodiment, each included module is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A pressure sensing structure suitable for curved surface deformation detection is characterized by comprising a pressing panel, a pressure sensing part and a fastening piece; the pressing panel is provided with a concave surface and a convex surface corresponding to the concave surface, the convex surface receives pressing of a user, the pressure sensing part is arranged on one side where the concave surface is located, the concave surface of the pressing panel extends towards the pressure sensing part for a preset length to form at least one mounting part, the mounting part is formed in an injection molding mode, and the mounting part and the pressing panel are integrally formed; two sides of the pressure sensing part respectively abut against the pressing panel, the fastening pieces abut against the pressure sensing part, and each fastening piece is matched with each mounting part to clamp and fix the pressure sensing part; along the pressing direction, the position of the pressure sensing part abutted against the pressing panel is located below the clamped and fixed position of the pressure sensing part, and the pressure sensing part is in an arc shape with a preset curvature.
2. The pressure sensing structure of claim 1, wherein the portion where the pressure sensing part is clamped is a middle portion of the pressure sensing part.
3. The pressure sensing structure of claim 2, wherein the degree of curvature of the pressure sensing part becomes smaller and the curvature becomes smaller when the pressing panel receives the user's pressing.
4. The pressure sensing structure of claim 3, wherein a line connecting both sides of the pressure sensing part against the pressing panel is perpendicular to a length direction of the mounting part.
5. The pressure sensing structure of claim 4, wherein the mounting portion is a stud, the fastener is a screw, the pressure sensing portion is provided with at least one through hole matched with the screw, and the screw penetrates through the through hole to press against the pressure sensing portion and is screwed into the mounting portion to clamp and fix the pressure sensing portion.
6. The pressure sensing structure of claim 5, wherein the pressure sensing portion comprises a reinforcing plate and a pressure sensing module, the pressure sensing module comprises a circuit substrate and at least one stress detection unit located on the circuit substrate, the reinforcing plate is provided with a stress concentration area, the stress detection unit corresponds to the stress concentration area, and the stress concentration area is provided with a stress concentration groove.
7. The pressure sensing structure of claim 6, wherein the stress concentrating groove has a U-shaped cross section or a V-shaped cross section; or the cross section of the stress concentration groove is in a sawtooth shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110838997.8A CN113503808B (en) | 2021-07-23 | 2021-07-23 | Forced induction structure suitable for curved surface deformation detects |
Applications Claiming Priority (1)
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| CN102445288B (en) * | 2010-10-05 | 2013-07-17 | 杨锦堂 | Large-load pressure and pulling force sensor |
| CN204305637U (en) * | 2014-11-25 | 2015-05-06 | 郑州豪威尔电子科技股份有限公司 | A kind of Grain Loss sophisticated sensor |
| CN110192172B (en) * | 2017-01-21 | 2022-10-14 | 深圳纽迪瑞科技开发有限公司 | Pressure induction type structure and electronic product |
| CN107997768A (en) * | 2018-01-02 | 2018-05-08 | 北京津发科技股份有限公司 | A kind of wearable respiration measurement device and breath measuring method |
| JP7021020B2 (en) * | 2018-07-24 | 2022-02-16 | アズビル株式会社 | Pressure sensor chip |
| CN110553785B (en) * | 2019-09-19 | 2020-12-01 | 嘉兴学院 | High-precision temperature compensation type pressure sensor |
| CN211978195U (en) * | 2020-03-06 | 2020-11-20 | 芯海科技（深圳）股份有限公司 | Pressure sensor module and electronic device |
| CN212322231U (en) * | 2020-05-18 | 2021-01-08 | 深圳瑞湖科技有限公司 | Touch module and electronic equipment |
| CN211909128U (en) * | 2020-06-05 | 2020-11-10 | 深圳瑞湖科技有限公司 | Pressure earphone |
| CN111780661B (en) * | 2020-07-22 | 2021-10-08 | 华中科技大学 | Method and system for accurately measuring bending strain of flexible electronic device |
| CN112146792A (en) * | 2020-09-15 | 2020-12-29 | 珠海普林芯驰科技有限公司 | Capacitance sensing device, working method thereof and electronic equipment |
| CN213211005U (en) * | 2020-10-22 | 2021-05-14 | 深圳瑞湖科技有限公司 | Pressure sensor, pressure sensing module and electronic equipment |
| CN213748854U (en) * | 2020-11-26 | 2021-07-20 | 芯海科技（深圳）股份有限公司 | Pressure sensor module and electronic device |
| CN113100989A (en) * | 2021-04-16 | 2021-07-13 | 深圳瑞湖科技有限公司 | No-key electric toothbrush |
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