Light-transmitting pressure sensor, light-transmitting pressure sensing module and electronic equipment

Abstract

The embodiment of the utility model provides a light-transmitting pressure sensor, a light-transmitting pressure sensing module and electronic equipment, the light-transmitting pressure sensor is a light-transmitting welded pressure sensor, and a first hollow light-transmitting area is arranged in the central area of a sensor main body, so that the light-transmitting requirement of a user is met through backlight; the sensor body is used for being electrically connected with the control circuit board through the first bonding pad, the pressure sensor can be designed to be standardized unified packaging, a client designs and arranges the sensor according to the actual needs of the client, the sensor is welded to the corresponding position of the control circuit board, and the position requirement of the key is met; actual design and production processes of the pressure sensor are reduced, and the development period is shortened; the modular design of the pressure sensor is realized, the sensor is standardized, batch production and stocking are facilitated, and the cost is reduced.

Description

Technical Field

[0001] The disclosed embodiments belong to the field of pressure sensing technology, and specifically relate to a light-transmitting pressure sensor, a light-transmitting pressure sensing module, and an electronic device. Background Art

[0002] With the advancement of science and technology and social development, pressure sensing technology has been widely used in the consumer electronics industry (such as mobile phones, headphones, laptops, and home appliances). Pressure sensors are used to realize applications such as pressure sensing and pressure function buttons. A common solution for pressure translucent buttons is to hollow out the sensor in the translucent area of ​​the button so that the backlight can pass through the sensor to the outer shell, achieving the translucent effect of the button. At present, translucent pressure sensors need to be customized according to the structural characteristics and application scenarios of pressure translucent buttons, and cannot be mass-produced, and the cost is relatively high. In addition, the solution development and production cycle of customized sensors is long. In multi-button scenarios, the production yield of integrated customized sensors will also be reduced.

[0003] In view of the above problems, it is necessary to propose a light-transmitting pressure sensor, a light-transmitting pressure sensing module and an electronic device that are reasonably designed and can effectively improve the above problems. Utility Model Content

[0004] The embodiments of the present disclosure aim to solve at least one of the technical problems existing in the prior art and provide a light-transmitting pressure sensor, a light-transmitting pressure sensing module and an electronic device.

[0005] An aspect of an embodiment of the present disclosure provides a light-transmitting pressure sensor, comprising:

[0006] A sensor body, wherein a stress concentration area is disposed at an edge area of ​​the sensor body, and a first hollow light-transmitting area is disposed at a central area of ​​the sensor body;

[0007] a detection circuit, disposed on the first surface of the sensor body and corresponding to the stress concentration area, to detect a voltage signal;

[0008] At least two first pads are disposed on the second surface of the sensor body and are electrically connected to the detection circuit; wherein,

[0009] The sensor body is used to be electrically connected to a control circuit board through the first pad to transmit the pressure signal to the control circuit board.

[0010] Optionally, the detection circuit includes at least one strain element;

[0011] The at least one strain element is disposed near the first hollow light-transmitting area, wherein two ends of the strain element are electrically connected to two adjacent first pads.

[0012] Optionally, the detection circuit includes two strain elements and two reference elements;

[0013] The two strain elements are arranged opposite to each other on two sides of the first hollow light-transmitting area along the length direction of the sensor body;

[0014] The two reference elements are respectively arranged on both sides of the two strain elements along the width direction of the sensor body.

[0015] Optionally, centers of the two strain elements are collinear with a center of the first hollow light-transmitting area.

[0016] Optionally, the length direction of the strain element is consistent with the width direction of the reference element; or,

[0017] The length direction of the strain element is consistent with the length direction of the reference element.

[0018] Optionally, the number of the first pads is four, and the four first pads are respectively arranged at four corner ends of the sensor body; wherein,

[0019] There is a preset gap between two first pads that are adjacent to each other along the width direction of the sensor body, and the preset gap corresponds to the strain element.

[0020] Another aspect of the embodiment of the present disclosure provides a light-transmitting pressure sensing module, including a control circuit board and at least one light-transmitting pressure sensor, wherein the light-transmitting pressure sensor is the light-transmitting pressure sensor described above;

[0021] The light-transmitting pressure sensor is fixed to the control circuit board by welding through the first soldering pad;

[0022] The control circuit board is provided with a second hollow light-transmitting area corresponding to the first hollow light-transmitting area.

[0023] Optionally, at least two second pads are provided on a side of the control circuit board facing the light-transmitting pressure sensor, and the second pads correspond to and are electrically connected to the first pads.

[0024] Another aspect of the disclosed embodiment provides an electronic device, including a pressing panel and a light-transmitting pressure sensing module, wherein the light-transmitting pressure sensing module adopts the light-transmitting pressure sensing module described above;

[0025] The pressing panel has a pressing area, and the pressing area is provided with a light-transmitting portion corresponding to the second hollow light-transmitting area;

[0026] The light-transmitting pressure sensing module is adhered and fixed to the pressing area.

[0027] Optionally, an adhesive layer is further included, and the adhesive layer is sandwiched between the control circuit board and the pressing area.

[0028] The light-transmitting pressure sensor, light-transmitting pressure sensing module and electronic device of the disclosed embodiments are light-transmitting welded pressure sensors. A first hollow light-transmitting area is provided in the central area of ​​the sensor body to meet the light-transmitting needs of users through backlight. The sensor body is electrically connected to the control circuit board through the first solder pad. The pressure sensor can be designed as a standardized unified package. Customers can design and arrange the sensors according to their actual needs and solder the sensors to the corresponding positions of the control circuit board to meet the position requirements of the buttons. The actual design and production process of the pressure sensor are reduced, and the development cycle is shortened. The modular design of the pressure sensor is realized, and the sensor is standardized to facilitate mass production, stocking, and cost reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a front view of a light-transmitting pressure sensor according to one embodiment of the present disclosure;

[0030] Figure 2 It is a rear view of a light-transmitting pressure sensor according to one embodiment of the present disclosure;

[0031] Figure 3 is a front view of a light-transmitting pressure sensor according to another embodiment of the present disclosure;

[0032] Figure 4 It is a front view of a light-transmitting pressure sensing module according to another embodiment of the disclosed embodiment;

[0033] Figure 5 is a cross-sectional view of a light-transmitting pressure sensing module according to another embodiment of the present disclosure;

[0034] Figure 6 It is a rear view of a light-transmitting pressure sensing module according to another embodiment of the disclosed embodiment;

[0035] Figure 7 It is a structural schematic diagram of an electronic device according to another embodiment of the disclosed embodiment;

[0036] Figure 8 This is a cross-sectional view of an electronic device according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the embodiments of the present disclosure, the embodiments of the present disclosure are further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0038] like Figures 1 to 3As shown, one aspect of an embodiment of the present disclosure provides a light-transmitting pressure sensor 100 , including a sensor body 110 , a detection circuit, and at least two first pads 120 .

[0039] The edge area of ​​the sensor body 110 is provided with a stress concentration area 111, and the central area of ​​the sensor body is provided with a first hollow light-transmitting area 112. In other words, the central area of ​​the sensor body is a hollow structure.

[0040] It should be noted that the shape of the first hollow light-transmitting area 112 is not specifically limited. Figure 1 In addition to the circle shown, it can also be a rectangle or a square, etc., which can be selected according to actual needs.

[0041] It should be further explained that the shape of the sensor body 110 is not specifically limited in this embodiment. Figure 1 In addition to the rectangle shown, other shapes are also possible and can be selected according to the actual needs of the customer.

[0042] The detection circuit is disposed on the first surface of the sensor body 110 and corresponds to the stress concentration area 111 to detect the voltage signal. In this embodiment, the first surface of the sensor body 110 is the front surface of the sensor body 110, and the second surface of the sensor body 110 is the back surface of the sensor body 110. In other words, the detection circuit is disposed on the front surface of the sensor body 110.

[0043] like Figure 2 As shown, at least two first pads 120 are disposed on the second surface of the sensor body 110 and are electrically connected to the detection circuit. In other words, at least two first pads 120 are disposed on the back of the sensor body 110 and are electrically connected to the detection circuit. In this embodiment, at least two first pads 120 are located at the edge area of ​​the sensor body 110.

[0044] The sensor body 110 is used to be electrically connected to the control circuit board 210 through the first solder pad 120 to transmit the pressure signal to the control circuit board 210. Specifically, the sensor body 110 is soldered and fixed to the control circuit board 210 through the first solder pad 120 to achieve electrical connection between the light-transmitting pressure sensor 100 and the control circuit board 210, so as to achieve the transmission of stress, deformation and electrical signals.

[0045] It should be noted that the number of the first pads 120 is not specifically limited in this embodiment and can be selected according to actual needs.

[0046] The light-transmitting pressure sensor, light-transmitting pressure sensing module and electronic device of the disclosed embodiments are light-transmitting welded pressure sensors. A first hollow light-transmitting area is provided in the central area of ​​the sensor body to meet the light-transmitting needs of users through backlight. The sensor body is electrically connected to the control circuit board through the first solder pad. The pressure sensor can be designed as a standardized unified package. Customers can design and arrange the sensors according to their actual needs and solder the sensors to the corresponding positions of the control circuit board to meet the position requirements of the buttons. The actual design and production process of the pressure sensor are reduced, and the development cycle is shortened. The modular design of the pressure sensor is realized, and the sensor is standardized to facilitate mass production, stocking, and cost reduction.

[0047] It should be noted that the substrate of the sensor body 110 can be a PCB substrate or an FPC substrate, which can be selected according to actual needs and is not specifically limited in this embodiment.

[0048] For example, Figure 1 and Figure 3 As shown, the detection circuit includes at least one strain element 141. At least one strain element 141 is disposed near the first hollow light-transmitting area 112, wherein two ends of the strain element 141 are electrically connected to two adjacent first pads 120. Specifically, at least one strain element 141 is disposed near the maximum deformation area of ​​the sensor body 110.

[0049] like Figure 1 and Figure 3 As shown, in this embodiment, the detection circuit further includes at least one reference element 142 located on one side of the strain element 141. At least one reference element 142 is disposed away from the first hollow light-transmitting area 112. Specifically, at least one reference element 142 is disposed away from the maximum deformation area of ​​the sensor body 110, so that a large pressure difference is formed between the strain element 141 and the reference element 142, thereby increasing the output of the pressure signal. Each strain element 141 and each reference element 142 are electrically connected to the first pad 120 to form a conductive circuit.

[0050] It should be understood that the strain element 141 and the reference element 142 of this embodiment are printed resistors, and the first pad 120 can be used as an input terminal, an output terminal, a power supply or a ground terminal to form a conductive circuit with the strain element 141 and the reference element 142 .

[0051] It should be noted that the detection circuit of this embodiment can adopt any one of a voltage divider circuit, a shunt circuit, a Wheatstone bridge, a half bridge, a full bridge or other bridge circuits. Accordingly, the specific positions and quantities of the strain element and the reference element are not specifically limited. For example, one is set, that is, a single resistor form, or four are set to form a Wheatstone bridge.

[0052] Exemplary, preferred, such as Figure 1 and Figure 3 As shown, in this embodiment, the detection circuit includes two strain elements 141 and two reference elements 142 , and the two strain elements 141 and the two reference elements 142 form a Wheatstone bridge.

[0053] The two strain elements 141 are disposed oppositely on both sides of the first hollow light-transmitting area 112 along the length direction of the sensor body 110. The deformation of the sensor body 110 at the distribution position of the two strain elements 141 is relatively large, so that the resistance of the two strain elements 141 changes greatly.

[0054] Specifically, Figure 1 and Figure 3 As shown, the two strain elements 141 are respectively disposed on the upper and lower sides of the first hollow light-transmitting area 112 , and are in contact with the first hollow light-transmitting area 112 .

[0055] The two reference elements 142 are respectively arranged on both sides of the two strain elements 141 along the width direction of the sensor body 110. Specifically, the two reference elements 142 are respectively arranged at two opposite corner ends of the sensor body 110, and the deformation of the sensor body 110 at the distribution positions of the two reference elements 142 is small, so that the resistance change of the two reference elements 142 is small.

[0056] The strain element 141 is close to the larger deformation area of ​​the sensor body 110, and the reference element 142 is far away from the larger deformation area of ​​the sensor body 110, so that the resistance difference between the strain element 141 and the reference element 142 is larger, thereby increasing the pressure signal output and increasing the sensitivity of the sensor.

[0057] Specifically, Figure 1 and Figure 3 As shown, the reference element 142 located at the upper portion of the sensor body 110 is distributed on the right side of the upper strain element 141 , and the reference element 142 located at the lower portion of the sensor body 110 is distributed on the left side of the lower strain element 141 .

[0058] Further preferably, in this embodiment, if Figure 1 and Figure 3As shown, the centers of the two strain elements 141 are collinear with the center of the first hollow light-transmitting area 112. That is to say, the two strain elements 141 are distributed at the upper and lower positions of the first hollow light-transmitting area 112, at which the deformation of the sensor body 110 is the largest, and thus the resistance change of the two strain elements 141 is the largest. The distribution position of the reference element 142 only needs to be away from the area with the largest deformation of the sensor body 110, and the specific distribution position is not specifically limited in this embodiment, as long as a certain pressure difference is formed between the strain element 141 and the reference element 142 under the deformation condition of the pressure sensor.

[0059] For example, Figure 1 As shown, in one embodiment, the length direction of the strain element 141 is consistent with the width direction of the reference element 141 .

[0060] Specifically, Figure 1 As shown, two strain elements 141 are respectively arranged at the upper and lower positions of the first hollow light-transmitting area 112, and the strain element 141 is rectangular in shape, and the length direction of the strain element 141 is consistent with the width direction of the sensor body 110. One of the reference elements 142 is distributed on the left side of the corresponding strain element 141, and the other reference element 142 is distributed on the right side of the corresponding strain element 141. The two reference elements 142 are also rectangular in shape, and their length directions are consistent with the length direction of the sensor body 110, that is, the length direction of the strain element 141 is consistent with the width direction of the reference element 141.

[0061] For example, Figure 3 As shown, in another embodiment, the length direction of the strain element 141 is consistent with the length direction of the reference element 141 .

[0062] Specifically, Figure 3 As shown, two strain elements 141 are respectively arranged at the upper and lower positions of the first hollow light-transmitting area 112, and the strain element 141 is rectangular in shape, and the length direction of the strain element 141 is consistent with the width direction of the sensor body 110. One of the reference elements 142 is distributed on the left side of the corresponding strain element 141, and the other reference element 142 is distributed on the right side of the corresponding strain element 141. The two reference elements 142 are also rectangular in shape, and their length directions are consistent with the width direction of the sensor body 110, that is, the length direction of the strain element 141 is consistent with the length direction of the reference element 142.

[0063] For example, Figure 2As shown, there are four first pads 120, which are respectively arranged at the four corner ends of the sensor body 110. Both ends of each strain element 141 are respectively electrically connected to two adjacent first pads 120. There is a preset gap 121 between two first pads 120 adjacently distributed along the width direction of the sensor body 110, and the preset gap 121 corresponds to the strain element 141.

[0064] In this embodiment, there is a preset gap between two first pads adjacently distributed along the width direction of the sensor body, so that the sensor body can have a greater deformation at the preset gap. The preset gap corresponds to the strain element, which can make the resistance change of the strain element greater, thereby increasing the sensitivity of the sensor. In addition, first pads are provided at the four corners of the sensor body, so that the sensor can be fixed on the control circuit board more firmly.

[0065] It should be noted that there is no specific limit on the number of first pads 120, which may be two first pads 120, or four or six first pads. There is no specific limit on the position and shape of the first pad 120, which may be selected according to actual needs.

[0066] like Figures 4 to 6 As shown, another aspect of the embodiment of the present disclosure provides a light-transmitting pressure sensing module 200, including a control circuit board 210 and at least one light-transmitting pressure sensor 100, wherein the light-transmitting pressure sensor adopts the light-transmitting pressure sensor 100 described above. The specific structure of the light-transmitting pressure sensor 100 has been described in detail above, and will not be repeated here, and reference can be made to the above description.

[0067] The light-transmitting pressure sensor 100 is fixed to the control circuit board 210 by welding through the first solder pad 120 to achieve the transmission of stress, deformation and electrical signals. In this way, the light-transmitting pressure sensor 100 and the control circuit board 210 form a whole, that is, a light-transmitting pressure sensing module 200. Customers can arrange the position and quantity of the light-transmitting pressure sensors 100 according to their actual needs to reduce the cycle of customers developing pressure sensor module applications, facilitate production, and reduce costs.

[0068] like Figure 6 As shown, the control circuit board 210 is provided with a second hollow light-transmitting area 211 corresponding to the first hollow light-transmitting area 112 to achieve light transmission of the keys. That is, the second hollow light-transmitting area 211 of the control circuit board 210 is also a hollow structure.

[0069] like Figure 6 As shown, at least two second pads 220 are provided on a side of the control circuit board 210 facing the light-transmitting pressure sensor 110 , and the second pads 220 correspond to and are electrically connected to the first pads 120 .

[0070] It should be noted that, in this embodiment, three light-transmitting pressure sensors 100 are welded and fixed on the control circuit board 210. The number of the light-transmitting pressure sensors 100 is not specifically limited in this embodiment and can be selected according to actual needs.

[0071] It should be further explained that, in this embodiment, the number of the second pads 220 is not specifically limited, and there may be two second pads 220, or there may be four or six second pads 220. Specifically, in this embodiment, a first pad 120 is provided at each of the four corner ends of the light transmission pressure sensor 100, for a total of four first pads 120, and correspondingly, the number of the second pads 220 is also four, so that each second pad 220 corresponds to each first pad 120 one by one, and the number is the same, so as to realize the electrical connection between the light transmission sensor 100 and the control circuit board 210.

[0072] The light-transmitting pressure sensing module of the disclosed embodiment can realize light transmission of the keys by providing a second hollow light-transmitting area corresponding to the first hollow light-transmitting area on the control circuit board. At least one light-transmitting pressure sensor is fixed to the control circuit board by welding through the first solder pad. Since the light-transmitting pressure sensor can be designed as a standardized unified package, the customer can design and arrange the light-transmitting pressure sensing module by welding a corresponding number of light-transmitting pressure sensors on the control circuit board according to their actual needs. There is no need to customize the sensor, which reduces the cycle of the customer's development of the light-transmitting pressure sensor module application, facilitates production, and reduces costs; the pressure sensing module has a simple structure, is easy to design and improve, and the pressure sensing module with standardized package can realize rapid verification of pressure sensing applications.

[0073] like Figure 7 and Figure 8 As shown, another aspect of the embodiment of the present disclosure provides an electronic device 300, including a pressing panel 310 and a light-transmitting pressure sensing module 200, wherein the light-transmitting pressure sensing module 200 adopts the light-transmitting pressure sensing module 200 described above. The specific structure of the light-transmitting pressure sensing module 200 has been described in detail above, and will not be repeated here, and reference can be made to the above description.

[0074] The pressing panel 310 has a pressing area, and the pressing area is provided with a light-transmitting portion corresponding to the second hollow light-transmitting area. The key backlight is sequentially transmitted to the light-transmitting portion of the pressing panel 310 through the first hollow light-transmitting area and the second hollow light-transmitting area, so as to achieve the light-transmitting effect of the key. Among them, the light-transmitting portion can be a hollow structure, or a light-transmitting portion formed of a transparent material, which can be limited according to actual needs.

[0075] The light-transmitting pressure sensing module 200 is fixed to the pressing area. Figure 8As shown, the electronic device 300 further includes an adhesive layer 320, which is sandwiched between the control circuit board 210 and the pressing area. That is, the control circuit board 210 is directly attached to the pressing area of ​​the pressing panel 310 through the adhesive layer 320 to transfer stress and deformation. When the pressing panel 310 is directly pressed, the stress is transferred to the control circuit board 210 and then to the light-transmitting pressure sensor 100.

[0076] It should be noted that the present embodiment does not specifically limit the specific material of the adhesive layer 320, and a double-sided adhesive layer, an acrylic foam adhesive layer, an AB adhesive layer, an epoxy resin adhesive layer, a silicone adhesive layer or other similar adhesive layers may also be used for bonding.

[0077] It should be further explained that the present embodiment does not specifically limit the electronic device. For example, the electronic device may be a laptop computer, a mobile phone, a washing machine, etc.

[0078] For the electronic device of the disclosed embodiment, the customer can fit the translucent pressure sensing module to the pressing panel of the key according to the specific structure of the key of the electronic device. The customer can arrange the position and quantity of the translucent pressure sensors according to their actual needs to reduce the customer's development cycle of the pressure sensor module application, facilitate production and reduce costs.

[0079] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the embodiments of the present disclosure, but the embodiments of the present disclosure are not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the embodiments of the present disclosure, and these modifications and improvements are also considered to be within the protection scope of the embodiments of the present disclosure.

Claims

1. A light-transmitting pressure sensor, characterized in that: include: A sensor body, wherein a stress concentration area is disposed at an edge area of ​​the sensor body, and a first hollow light-transmitting area is disposed at a central area of ​​the sensor body; a detection circuit, disposed on the first surface of the sensor body and corresponding to the stress concentration area, to detect a pressure signal; At least two first pads are disposed on the second surface of the sensor body and are electrically connected to the detection circuit; wherein, The sensor body is used to be electrically connected to a control circuit board through the first pad to transmit the pressure signal to the control circuit board.

2. The light-transmitting pressure sensor according to claim 1, characterized in that: The detection circuit includes at least one strain element; The at least one strain element is disposed near the first hollow light-transmitting area, wherein two ends of the strain element are electrically connected to two adjacent first pads.

3. The light-transmitting pressure sensor according to claim 2, characterized in that: The detection circuit includes two strain elements and two reference elements; The two strain elements are arranged opposite to each other on two sides of the first hollow light-transmitting area along the length direction of the sensor body; The two reference elements are respectively arranged on both sides of the two strain elements along the width direction of the sensor body.

4. The light-transmitting pressure sensor according to claim 3, characterized in that: The centers of the two strain elements are collinear with the center of the first hollow light-transmitting area.

5. The light-transmitting pressure sensor according to claim 3, characterized in that: The length direction of the strain element is consistent with the width direction of the reference element; or, The length direction of the strain element is consistent with the length direction of the reference element.

6. The light-transmitting pressure sensor according to claim 3, characterized in that: The number of the first pads is four, and the four first pads are respectively arranged at the four corner ends of the sensor body; wherein, There is a preset gap between two first pads that are adjacent to each other along the width direction of the sensor body, and the preset gap corresponds to the strain element.

7. A light-transmitting pressure sensing module, characterized in that: It comprises a control circuit board and at least one light-transmitting pressure sensor, wherein the light-transmitting pressure sensor is the light-transmitting pressure sensor according to any one of claims 1 to 6; The light-transmitting pressure sensor is fixed to the control circuit board by welding through the first soldering pad; The control circuit board is provided with a second hollow light-transmitting area corresponding to the first hollow light-transmitting area.

8. The light-transmitting pressure sensing module according to claim 7, characterized in that: At least two second pads are disposed on a side of the control circuit board facing the light-transmitting pressure sensor, and the second pads correspond to and are electrically connected to the first pads.

9. An electronic device, characterized in that: It comprises a pressing panel and a light-transmitting pressure sensing module, wherein the light-transmitting pressure sensing module adopts the light-transmitting pressure sensing module according to claim 7; The pressing panel has a pressing area, and the pressing area is provided with a light-transmitting portion corresponding to the second hollow light-transmitting area; The light-transmitting pressure sensing module is adhered and fixed to the pressing area.

10. The electronic device according to claim 9, characterized in that: It also includes an adhesive layer, which is sandwiched between the control circuit board and the pressing area.

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