CN217388679U - Key structure and electronic equipment - Google Patents
Key structure and electronic equipment Download PDFInfo
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- CN217388679U CN217388679U CN202220550681.9U CN202220550681U CN217388679U CN 217388679 U CN217388679 U CN 217388679U CN 202220550681 U CN202220550681 U CN 202220550681U CN 217388679 U CN217388679 U CN 217388679U
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Abstract
The application belongs to the technical field of pressure sensing and relates to a key structure and electronic equipment. In the key structure, the pressure sensor is arranged between the shell and the supporting piece, the elastic body comprises the supporting part and the elastic deformation part, the supporting part is arranged on the supporting piece, and one end of the elastic deformation part is abutted to the inner side of the shell corresponding to the pressing area. When the outer side of the pressing area of the shell is pressed, the elastic deformation part can generate bending deformation, so that the base material arranged on the elastic deformation part is deformed along with the elastic deformation part, the strain sensing resistor in the strain detection circuit is deformed along with the elastic deformation part, and the strain detection circuit can detect the changed electric signal to realize the pressing action detection of the pressing area of the shell. This application button structure need not trompil on the casing, does not have the gap, cancels the entity button, does not have like conventional entity button to have card key, button gap ponding easily, the long-pending dirty, go mildy easily, unhygienic problem under humid environment. The electronic equipment with the key structure has the same technical effect.
Description
Technical Field
The application belongs to the technical field of pressure sensing and relates to a key structure and electronic equipment.
Background
Electronic equipment on the market at present is usually provided with a solid key, and the solid key realizes current conduction and disconnection through the motion of a structural part, and realizes opening and closing of the equipment or selection of a preset function. However, the solid keys have the disadvantages that the keys are easy to be blocked, the key gaps are easy to accumulate water and dirt, and the keys are easy to mildew and unsanitary in a humid environment.
SUMMERY OF THE UTILITY MODEL
An object of the embodiment of the application is to provide a key structure and an electronic device, so as to solve the technical problems that in the prior art, an entity key is easy to block, the key gap is easy to accumulate water and dirt, and the key is easy to mildew and unsanitary in a humid environment.
In order to achieve the purpose, the technical scheme adopted by the application is as follows: the embodiment of the application provides a key structure, which comprises a shell, a supporting piece and a pressure sensor;
the housing has a pressing region;
the supporting piece is positioned on the inner side of the shell and is arranged at a distance from the shell;
the pressure sensor includes an elastomer, a substrate, and a strain detection circuit;
the elastic body comprises a supporting part and an elastic deformation part which are connected, the supporting part is arranged on the supporting part, the elastic deformation part is arranged in a way that the supporting part inclines or bends and extends towards the shell, and one end of the elastic deformation part, which is far away from the supporting part, abuts against the inner side of the shell, which corresponds to the pressing area;
the base material is at least partially attached to the elastic deformation part;
the strain detection circuit is provided with at least two resistors, at least one of the resistors is a strain sensing resistor for detecting the deformation of the elastic deformation part, and the strain sensing resistor is arranged at the position of the base material corresponding to the elastic deformation part.
Optionally, the supporting member is a printed circuit board, and the pressure sensor is attached to the printed circuit board and electrically connected to the printed circuit board;
or, the supporting piece is a bracket which is fixed on the shell.
Optionally, the support portion and the elastic deformation portion are of an integrally formed structure, and the elastic deformation portion is formed by bending relative to the support portion.
Optionally, one end of the elastic deformation portion, which is far away from the support portion, is provided as a bending portion, and an outer peripheral surface of the bending portion abuts against an inner side of the housing, which corresponds to the pressing area.
Optionally, the base material is matched with the shape of the elastic body, the base material comprises a first connecting portion and a second connecting portion which are connected, the first connecting portion is attached to the bottom surface of the supporting portion, the second connecting portion is attached to the bottom surface of the elastic deformation portion, and the strain sensing resistor is arranged on the second connecting portion.
Optionally, the support part is frame-shaped, L-shaped or linear.
Optionally, the substrate is fixed to the elastomer by a colloid.
Optionally, the wall thickness of the shell corresponding to the pressing area is smaller than the wall thickness of the area surrounding the pressing area.
Optionally, the strain detection circuit has one of the strain sensing resistors and one of the reference resistors, and the strain detection circuit is a voltage divider circuit formed by connecting one of the strain sensing resistors and one of the reference resistors in series;
or the strain detection circuit is provided with one strain sensing resistor and one reference resistor, and the strain detection circuit is a shunt circuit formed by connecting one strain sensing resistor and one reference resistor in parallel;
or the strain detection circuit is provided with two strain sensing resistors, and the strain detection circuit is a voltage division circuit formed by connecting the two strain sensing resistors in series;
or the strain detection circuit is provided with two strain sensing resistors and is a shunt circuit formed by connecting the two strain sensing resistors in parallel;
or the strain detection circuit is provided with two strain sensing resistors and two reference resistors, and the strain detection circuit is a half bridge formed by electrically connecting the two strain sensing resistors and the two reference resistors;
or the strain detection circuit is provided with four strain sensing resistors and is a full bridge formed by electrically connecting the four strain sensing resistors;
or the strain detection circuit is provided with one strain sensing resistor and three reference resistors, and the strain detection circuit is a bridge circuit formed by electrically connecting one strain sensing resistor and three reference resistors.
An embodiment of the application provides an electronic device, which includes the above key structure.
The application provides a button structure and electronic equipment's beneficial effect lies in: in this application button structure, set up pressure sensor between casing and support piece, the elastomer includes supporting part and elastic deformation portion, and on the support piece was located to the supporting part, the one end of elastic deformation portion supported and locates the casing and correspond the inboard according to the nip. When the outer side of the pressing area of the shell is pressed, the elastic deformation part can generate bending deformation, so that the base material arranged on the elastic deformation part is deformed along with the elastic deformation part, the strain sensing resistor in the strain detection circuit is deformed along with the elastic deformation part, and the strain detection circuit can detect the changed electric signal to realize the pressing action detection of the pressing area of the shell. After the pressing area is released, the elastic deformation part resets, and the base material and the strain sensing resistor reset along with the elastic deformation part to prepare for the next pressing action detection. This application button simple structure can effectively detect and press the action, and this button structure need not trompil on the casing, does not have the gap, cancels the entity button, does not have like conventional entity button to have card key, easy ponding in button gap, long-pending dirty, go mildy easily, unhygienic problem under humid environment. The electronic equipment with the key structure has the same technical effect.
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 key structure provided in an embodiment of the present application;
FIG. 2 is a partial cross-sectional view of the key structure of FIG. 1 taken along line A-A;
FIG. 3 is a schematic diagram of the key structure of FIG. 2 when pressed;
FIG. 4 is an exploded perspective view of the key structure of FIG. 1;
FIG. 5 is an enlarged view of the elastomer and substrate in the key structure of FIG. 4;
FIG. 6 is a perspective assembly view of the elastomer and base material of FIG. 5;
fig. 7 to 10 are schematic diagrams of strain detection circuits in key structures according to different embodiments of the present disclosure.
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.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting 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.
Referring to fig. 1 to 4, a key structure 100 according to an embodiment of the present disclosure includes a housing 10, a supporting member 20, and a pressure sensor 30. The housing 10 has a pressing area 11. The support member 20 is located at the inner side 10a of the housing 10 and is spaced apart from the housing 10. Referring to fig. 5 to 7, the pressure sensor 30 includes an elastic body 31, a base material 32, and a strain detection circuit 33. The elastic body 31 includes a supporting portion 311 and an elastic deformation portion 312 connected to each other, the supporting portion 311 is disposed on the supporting member 20, the elastic deformation portion 312 is disposed by inclining or bending the supporting member 20 toward the housing 10, and referring to fig. 2 and 3, one end of the elastic deformation portion 312 away from the supporting portion 311 abuts against the inner side 10a of the housing 10 corresponding to the pressing area 11. The substrate 32 is at least partially attached to the elastic deformation portion 312. Referring to fig. 7, the strain detection circuit 33 includes at least two resistors, at least one of which is a strain sensitive resistor R1 for detecting deformation of the elastic deformation portion 312, and the strain sensitive resistor R1 is provided at a position of the base material 32 corresponding to the elastic deformation portion 312.
The housing 10 may be configured in different shapes, such as a plate shape, a column shape, etc., according to the requirements of the electronic device. Referring to fig. 2 and 3, inner side 10a and outer side 10b of casing 10 are opposite sides of casing 10. The inner side 10a is the side facing away from the user and the outer side 10b is the side facing towards the user. The pressing area 11 of the housing 10 or the entire housing 10 can be made of a material with elasticity, such as plastic, metal, etc.
In the key structure 100 provided by the present application, the pressure sensor 30 is disposed between the housing 10 and the supporting member 20, the elastic body 31 includes a supporting portion 311 and an elastic deformation portion 312, the supporting portion 311 is disposed on the supporting member 20, and one end of the elastic deformation portion 312 abuts against the inner side 10a of the housing 10 corresponding to the pressing area 11. When the outer side 10b of the pressing area 11 of the housing 10 is pressed, the elastic deformation portion 312 is deformed by bending, and the base material 32 provided on the elastic deformation portion 312 is deformed by following, and the strain sensitive resistor in the strain detection circuit 33 is deformed by following, and the strain detection circuit 33 detects the changed electric signal, thereby detecting the pressing operation of the pressing area 11 of the housing 10. After the pressing area 11 is released, the elastic deformation portion 312 is reset, and the base material 32 and the strain sensitive resistor are reset following the elastic deformation portion 312 in preparation for the next detection of the pressing operation. This application button structure 100 is simple, can effectively detect and press the action, and this button structure 100 need not trompil on casing 10, does not have the gap, cancels the entity button, does not have like conventional entity button have card key, button gap ponding easily, long-pending dirty, go mildy easily, unhygienic problem under humid environment.
When the key structure 100 is applied to an electronic device, different actions such as single click, double click, long press and the like can be set for the key structure 100 to switch different functions. The button arrangement 100 is electrically connected to the controller (or control panel) so that the controller is informed of the different pressing actions to activate the corresponding electrical device. For example, when the button structure 100 is applied to an electric toothbrush, the long pressing area 11 can switch the on and off states of the electric toothbrush, and the single pressing area 11 can select a predetermined function. When the button is applied to other electronic equipment, corresponding functions of different pressing modes can be set as required.
In another embodiment of the present application, referring to fig. 2 to 4, the supporting member 20 is a printed circuit board, and the pressure sensor 30 is attached to and electrically connected to the printed circuit board. The pressure sensor 30 of the present application is assembled on a printed circuit board using Surface Mount Technology (SMT), which is easy to form and enables electrical connection between the pressure sensor 30 and the printed circuit board. The printed circuit board has a circuit capable of realizing a predetermined function, and an electric signal detected by the pressure sensor 30 may be transmitted to the printed circuit board, thereby realizing the pressing signal acquisition.
In another embodiment of the present application, the support member 20 is a bracket, and the bracket is fixed to the housing 10. This way, the pressing action detection of the pressing area 11 of the housing 10 can be achieved. The bracket may be fixed directly to the inside 10a of the housing 10, or the bracket may be fixed indirectly to the inside 10a of the housing 10 through other structural members.
In another embodiment of the present application, please refer to fig. 6, the supporting portion 311 and the elastic deformation portion 312 are integrally formed, and the elastic deformation portion 312 is formed by bending relative to the supporting portion 311. Such an elastic body 31 is easily molded. The elastic body 31 may be formed by bending a metal sheet. Or the supporting portion 311 and the elastic deformation portion 312 are integrally molded by injection molding.
In another embodiment of the present application, please refer to fig. 2, 5, and 6, an end of the elastic deformation portion 312 away from the supporting portion 311 is provided as a bending portion 313, and an outer circumferential surface of the bending portion 313 abuts against an inner side 10a of the housing 10 corresponding to the pressing area 11. The end of the elastic deformation portion 312 contacting the case 10 is provided as the bent portion 313, so that the inner side 10a of the case 10 and the end of the elastic deformation portion 312 are kept in contact, and with reference to fig. 3, the deformation of the pressing region 11 when the pressing region 11 is pressed can be effectively transmitted to the elastic deformation portion 312, thereby elastically deforming the elastic deformation portion 312.
In another embodiment of the present application, please refer to fig. 5 and 6, the shapes of the substrate 32 and the elastic body 31 are adapted, the substrate 32 includes a first connection portion 321 and a second connection portion 322 connected to each other, the first connection portion 321 is attached to the bottom surface of the supporting portion 311, the second connection portion 322 is attached to the bottom surface of the elastic deformation portion 312, and the strain sensing resistor is disposed on the second connection portion 322. The base material 32 and the elastic body 31 are adapted in shape, i.e., substantially the same in shape. The base material 32 and the elastic body 31 are easily assembled and reliably connected. Illustratively, the supporting portion 311 is in the shape of a closed frame, and the elastic deformation portion 312 is in the shape of a strip. The first connecting portion 321 of the substrate 32 is in a closed frame shape, and the second connecting portion 322 is in a strip shape. When the pressing area 11 is pressed, the second connecting portion 322 is elastically deformed following the elastic deformation portion 312, and the strain sensitive resistor on the second connecting portion 322 detects the deformation of the elastic deformation portion 312.
When the supporting member 20 is a printed circuit board, the first connecting portion 321 and the second connecting portion 322 are both provided with a circuit, and the circuit of the first connecting portion 321 can be connected to the circuit of the second connecting portion 322 and the printed circuit board, so as to electrically connect the strain detecting circuit 33 and the printed circuit board.
In another embodiment of the present application, please refer to fig. 5 and 6, the supporting portion 311 is in a frame shape, an L shape, a linear shape or other shapes, and is disposed as required.
Illustratively, the supporting portion 311 is in the shape of a closed frame, and the elastic deformation portion 312 is in the shape of a strip. The elastic body 31 is formed by cutting and bending an elastic sheet, a frame-shaped supporting portion 311 and a strip-shaped elastic deformation portion 312 are cut in the middle of the elastic sheet, one end of the elastic deformation portion 312 is connected to an inner edge of the frame-shaped supporting portion 311, and then the elastic deformation portion 312 is bent to form a certain included angle between the elastic deformation portion 312 and the supporting portion 311.
In another embodiment of the present application, referring to fig. 5 and 6, the substrate 32 is fixed on the elastic body 31 by a glue (not shown). The base material 32 and the elastic body 31 are reliably connected, and the deformation of the elastic deformation part 312 can be transmitted to the base material 32 through the colloid when the pressing area 11 is pressed, so that the strain sensing resistor on the base material 32 is deformed to detect the pressing action.
In another embodiment of the present application, referring to fig. 2, the wall thickness of housing 10 corresponding to pressing area 11 is smaller than the wall thickness of the area surrounding pressing area 11. The wall thickness of the pressing region 11 of the housing 10 is set to be small, so that the pressing region 11 is deformed more than the surrounding area when the pressing region 11 is pressed, and the pressing region 11 pushes the elastic deformation portion 312 to effectively deform the elastic deformation portion 312 when the pressing region 11 is pressed.
In another embodiment of the present application, referring to fig. 7, the strain detection circuit 33 has a strain sensing resistor R1 and a reference resistor R0, and the strain detection circuit 33 is a voltage divider circuit formed by a strain sensing resistor R1 and a reference resistor R0 connected in series. For example, referring to fig. 2, the strain sensitive resistor R1 is provided in the elastic deformation portion 312, and the reference resistor R0 is provided corresponding to the elastic deformation portion 312 or the support portion 311. The constant voltage source is adopted, and the voltage is applied to two ends of the circuitBy input voltage U 0 Measuring strain-induced resistance R 1 The voltage at two ends has an input and output voltage formula:
by knowing the amount of change in U, the pressing action at the pressing zone 11 can be detected.
It is understood that in another embodiment, the strain detection circuit 33 has two strain sensing resistors, and the strain detection circuit 33 is a voltage division circuit formed by two strain sensing resistors connected in series; the pressing action in the pressing zone 11 can likewise be detected.
In another embodiment of the present application, referring to fig. 8, the strain detection circuit 33 has a strain sensing resistor R1 and a reference resistor R0, and the strain detection circuit 33 is a shunt circuit formed by a strain sensing resistor R1 and a reference resistor R0 connected in parallel. For example, referring to fig. 2, the strain sensitive resistor R1 is provided in the elastic deformation portion 312, and the reference resistor R0 is provided corresponding to the elastic deformation portion 312 or the support portion 311. The constant current source is adopted, and the input current I is applied to two ends of the circuit 0 Measuring the reference resistance R 0 Current I of the branch 2 There is an input-output current formula:
by knowing I 2 The amount of change in the pressing area 11 can be detected.
It is understood that in another embodiment, the strain detection circuit 33 has two strain sensing resistors, and the strain detection circuit 33 is a shunt circuit formed by connecting the two strain sensing resistors in parallel; the pressing action in the pressing zone 11 can likewise be detected.
In another embodiment of the present application, please refer to fig. 9, the strain detection circuit 33 has two strain sensing resistors (R1, R2) and two reference resistors R, and the strain detection circuit 33 is composed of two strain sensing resistors (R1, R2) and two reference resistors RThe resistor R is electrically connected with the formed half bridge; for example, referring to fig. 2, the strain sensitive resistor R1 is disposed at a position where the elastic deformation portion 312 is close to the housing 10, the strain sensitive resistor R2 is disposed at a position where the elastic deformation portion 312 is close to the support portion 311, and the two reference resistors R are disposed at the elastic deformation portion 312 or the support portion 311. Using half-bridges, across which an input voltage U is applied 0 Strain sensitive resistance R 1 And R 2 Between which a reference point is formed, between two reference resistances R, between which an output voltage U is measured, known as:
there is an input-output voltage formula:
U＝E 1 -E 2
by knowing U, the pressing action at the pressing area 11 can be detected.
In another embodiment of the present application, referring to fig. 10, the strain detection circuit 33 has four strain sensing resistors R1, R2, R3, and R4, and the strain detection circuit 33 is a full bridge formed by electrically connecting the four strain sensing resistors. Referring to fig. 2, two strain sensitive resistors R1 and R4 as one pair of opposing arms are provided in elastic deformation portion 312 at a position close to case 10, and two strain sensitive resistors R2 and R3 as the other pair of opposing arms are provided in elastic deformation portion 312 at a position close to support portion 311. By full-bridge, applying an input voltage U across the circuit 0 Strain sensitive resistance R 1 And R 2 Forming a reference point therebetween, a strain sensitive resistor R 3 And R 4 Between which a reference point is formed, and the output voltage U between the two reference points is measured, known as:
there is an input-output voltage formula:
U＝E 1 -E 2
by knowing U, the pressing action at the pressing area 11 can be detected.
It is understood that in another embodiment, the strain detection circuit 33 has one strain sensing resistor and three reference resistors, and the strain detection circuit 33 is a bridge circuit formed by electrically connecting one strain sensing resistor and three reference resistors; the pressing action in the pressing zone 11 can likewise be detected.
Alternatively, the strain detection circuit 33 may also be a circuit of other conventional technologies, which can detect the change of the strain sensitive resistor to identify the pressing action in the pressing area.
Referring to fig. 1 to 4, an electronic device including the key structure 100 is provided in an embodiment of the present disclosure. The electronic device can be various household appliances, industrial equipment, transportation equipment and the like, such as an electric toothbrush, terminal equipment, a television, a refrigerator, an air conditioner, an automobile, an unmanned aerial vehicle or other devices needing to be provided with keys. Since the electronic device adopts all the technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are also achieved, and are not described in detail herein.
Illustratively, the electronic device is a power toothbrush that further includes a housing, a drive motor (not shown), a control board, a battery 201, and a brushhead (not shown). The battery, drive motor and control board are all mounted within a housing of which the housing 10 is part. A holder 202 may be provided in the housing, and the battery 201, the driving motor, and the control board may be mounted on the holder 202. The battery, the driving motor and the control board, which may be a printed circuit board of the key structure 100, are electrically connected. The brush head is rotatably arranged on the shell, and the driving motor is used for driving the brush head to rotate. Through setting up the button structure 100 of this application, electric toothbrush can effectively detect and press the action, does not have like conventional entity button have the card key, button gap ponding easily, the long-pending dirty, go mildy easily under humid environment, unhygienic problem.
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 (10)
1. A key structure, characterized by: comprises a shell, a support and a pressure sensor;
the housing has a pressing region;
the supporting piece is positioned on the inner side of the shell and is arranged at a distance from the shell;
the pressure sensor includes an elastomer, a substrate, and a strain detection circuit;
the elastic body comprises a supporting part and an elastic deformation part which are connected, the supporting part is arranged on the supporting part, the elastic deformation part is arranged in a way that the supporting part inclines or bends and extends towards the shell, and one end of the elastic deformation part, which is far away from the supporting part, abuts against the inner side of the shell, which corresponds to the pressing area;
the base material is at least partially attached to the elastic deformation part;
the strain detection circuit is provided with at least two resistors, at least one of the resistors is a strain sensing resistor for detecting the deformation of the elastic deformation part, and the strain sensing resistor is arranged at the position of the base material corresponding to the elastic deformation part.
2. The key structure of claim 1, wherein: the support piece is a printed circuit board, and the pressure sensor is attached to the printed circuit board and electrically connected with the printed circuit board;
or, the supporting piece is a bracket which is fixed on the shell.
3. The key structure of claim 1, wherein: the supporting part and the elastic deformation part are of an integrally formed structure, and the elastic deformation part is formed by bending relative to the supporting part.
4. The key structure of claim 1, wherein: one end, far away from the supporting part, of the elastic deformation part is provided with a bending part, and the outer peripheral surface of the bending part abuts against the inner side, corresponding to the pressing area, of the shell.
5. The key structure of claim 1, wherein: the base material with the shape looks adaptation of elastomer, the base material is including first connecting portion and the second connecting portion that are connected, first connecting portion laminate in the bottom surface of supporting part, the second connecting portion laminate in the bottom surface of elastic deformation portion, strain induction resistance locates the second connecting portion.
6. The key structure of any one of claims 1-5, wherein: the supporting part is in a frame shape, an L shape or a linear shape.
7. The key structure of any one of claims 1-5, wherein: the base material is fixed on the elastomer through colloid.
8. The key structure of any one of claims 1-5, wherein: the wall thickness of the shell corresponding to the pressing area is smaller than that of the area around the pressing area.
9. The key structure of any one of claims 1-5, wherein: the strain detection circuit is provided with one strain sensing resistor and one reference resistor, and is a voltage division circuit formed by connecting one strain sensing resistor and one reference resistor in series;
or the strain detection circuit is provided with one strain sensing resistor and one reference resistor, and the strain detection circuit is a shunt circuit formed by connecting one strain sensing resistor and one reference resistor in parallel;
or the strain detection circuit is provided with two strain sensing resistors, and the strain detection circuit is a voltage division circuit formed by connecting the two strain sensing resistors in series;
or the strain detection circuit is provided with two strain sensing resistors, and the strain detection circuit is a shunt circuit formed by connecting the two strain sensing resistors in parallel;
or the strain detection circuit is provided with two strain sensing resistors and two reference resistors, and the strain detection circuit is a half bridge formed by electrically connecting the two strain sensing resistors and the two reference resistors;
or the strain detection circuit is provided with four strain sensing resistors and is a full bridge formed by electrically connecting the four strain sensing resistors;
or the strain detection circuit is provided with one strain sensing resistor and three reference resistors, and the strain detection circuit is a bridge circuit formed by electrically connecting one strain sensing resistor and three reference resistors.
10. An electronic device, characterized in that: comprising a key structure according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220550681.9U CN217388679U (en) | 2022-03-14 | 2022-03-14 | Key structure and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220550681.9U CN217388679U (en) | 2022-03-14 | 2022-03-14 | Key structure and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN217388679U true CN217388679U (en) | 2022-09-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220550681.9U Active CN217388679U (en) | 2022-03-14 | 2022-03-14 | Key structure and electronic equipment |
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| CN (1) | CN217388679U (en) |
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- 2022-03-14 CN CN202220550681.9U patent/CN217388679U/en active Active
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