Key device and electronic device

Abstract

The present invention relates to the field of key technology, and provides a key device and electronic device, which includes a keycap and a sensor assembly fixed to the back pressure surface of the keycap, the positive pressure surface of the keycap is used to receive the pressing force, and the sensor assembly is used to detect the pressing force; the sensor assembly includes a pressing support sheet fixed to the back pressure surface of the keycap, a plurality of sensors fixed to the side of the pressing support sheet away from the keycap, an export welding piece and a fixed welding piece fixed to the side of the pressing support sheet away from the keycap, and a piezoelectric single crystal fixed to the side of the fixed welding piece away from the keycap; the plurality of sensors are spaced apart from each other, and the export welding piece is located between the plurality of sensors; and the orthographic projections of the plurality of sensors and the export welding piece to the keycap respectively completely fall within the range of the back pressure surface of the keycap. Compared with the related art, the key device of the present invention can not only provide sufficient pressing stiffness support for finger pressing, but also bring rich local vibration feedback to the fingers, and the user experience effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of keys, and in particular to a key device and an electronic device. Background Art

[0002] Touch buttons are a type of button technology that achieves corresponding control by sensing pressing signals. Specifically, it is a technology that accurately detects the pressing position and pressing force to achieve precise control.

[0003] In the related art, existing physical buttons are mainly realized by buttons and button shrapnel (metal dome, snapdome; pot piece), etc. The function of the button is mainly realized by pressing the pot piece to turn on the circuit, and the feel is realized by the force feedback during the deformation of the pot piece. The effect of the physical button is relatively simple, and it is impossible to cooperate with special effects adapted to specific scenes to provide users with more direct and muscle memory-friendly prompts and feedback. However, when the buttons of the related art realize the local vibration of the buttons, they can only cooperate with a single scene to achieve the button feedback effect, which is poor for the final effect realization and user experience. Therefore, it is necessary to provide a new button device to solve the above problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a key device which can provide sufficient pressing stiffness support for finger pressing and bring rich local vibration feedback to the fingers.

[0005] To solve the above technical problems, in a first aspect, an embodiment of the present invention provides a key device, which includes a key cap and a sensor assembly fixed to the back pressure surface of the key cap, the positive pressure surface of the key cap is used to receive a pressing force, and the sensor assembly is used to detect the pressing force;

[0006] The sensor assembly includes a pressing support plate fixed to the back pressure surface of the keycap, a plurality of sensors fixed to the side of the pressing support plate away from the keycap, a lead-out welding plate and a fixed welding plate fixed to the side of the pressing support plate away from the keycap, and a piezoelectric single crystal fixed to the side of the fixed welding plate away from the keycap; the plurality of sensors are spaced apart from each other, and the lead-out welding plate is located between the plurality of sensors; and the orthographic projections of the plurality of sensors and the lead-out welding plates to the keycap respectively completely fall within the range of the back pressure surface of the keycap.

[0007] Preferably, the stiffness value of the pressing support sheet is 50~80N / mm.

[0008] Preferably, the plurality of sensors include a first sensor and a second sensor fixed at intervals on a side of the pressing support sheet away from the keycap, and the orthographic projections of the first sensor and the second sensor onto the keycap are respectively located at two ends of the back pressure surface of the keycap.

[0009] Preferably, the sensor is any one of a resistive sensor, a piezoelectric sensor, a capacitive sensor and an ionization sensor.

[0010] Preferably, two sides of the lead-out welding piece are respectively fixedly connected to the pressing support piece and / or the piezoelectric single crystal piece by means of gluing or laser welding.

[0011] Preferably, the lead-out welding piece is made of stainless steel, and the thickness of the lead-out welding piece is 0.3-0.5 mm.

[0012] Preferably, the fixed welding plate includes a first fixed welding plate and a second fixed welding plate, the first fixed welding plate and the second fixed welding plate are both fixed between the pressing support plate and the piezoelectric single crystal plate, the first fixed welding plate and the second fixed welding plate are spaced apart from each other along the length direction of the keycap, and the lead-out welding plate and the plurality of sensors are both located between the first fixed welding plate and the second fixed welding plate.

[0013] Preferably, the fixing welding plate is made of stainless steel, and the thickness of the fixing welding plate is 0.3-0.5 mm.

[0014] Preferably, the piezoelectric single crystal chip includes a substrate fixed to the side of the fixed welding plate away from the keycap and a piezoelectric ceramic plate fixed to the side of the substrate away from the keycap, the side of the lead-out welding plate away from the keycap abuts against the substrate, and the side of the sensor away from the keycap is spaced from the substrate.

[0015] Preferably, the length of the substrate is greater than the length of the piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is arranged opposite to the key cap.

[0016] Preferably, the substrate is made of stainless steel or beryllium bronze, and the thickness of the substrate is 0.1-0.5 mm.

[0017] Preferably, the piezoelectric ceramic sheet is a piezoelectric layer stack structure, and the number of layers of the piezoelectric layer stack structure is between 3 and 20.

[0018] In a second aspect, an embodiment of the present invention provides an electronic device, comprising a housing and a button device as described above fixed to the circumference of the housing; the housing comprises a shell having a receiving space and a through groove running through the circumference of the shell; the keycap is arranged in the through groove, the side of the sensor assembly close to the keycap is fixed to the inner wall of the shell, and the keycap is exposed or flush with the shell.

[0019] Compared with the related art, in the key device of the present invention, by fixing the sensor assembly on the keycap, the positive pressure surface of the keycap is used to receive the pressing force, and the sensor assembly is used to detect the pressing force; the sensor assembly includes a pressing support plate fixed to the back pressure surface of the keycap, a plurality of sensors fixed to the side of the pressing support plate away from the keycap, an export welding piece and a fixed welding piece fixed to the side of the pressing support plate away from the keycap, and a piezoelectric single crystal fixed to the side of the fixed welding piece away from the keycap; the plurality of sensors are spaced apart from each other, and the export welding piece is located between the plurality of sensors; the orthographic projections of the plurality of sensors and the export welding pieces to the keycap respectively completely fall within the range of the back pressure surface of the keycap; by pressing the keycap, the keycap squeezes the pressing support plate, the sensor installed on the pressing support plate is used to detect the pressing action of the human hand, the export welding piece is used to press the piezoelectric single crystal, and the corresponding force is fed back to the pressing support plate; the key can provide sufficient pressing stiffness support for finger pressing, and can also bring rich local vibration feedback to the finger, thereby improving the user experience effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0021] Figure 1 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention;

[0022] Figure 2 An exploded schematic diagram of a housing and a key device of an electronic device provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the structure of a key device provided by an embodiment of the present invention;

[0024] Figure 4 An exploded view of the structure of a key device provided by an embodiment of the present invention;

[0025] Figure 5 For along Figure 1 Sectional view along line AA;

[0026] Figure 6 for Figure 5 A partial enlarged view of the portion shown in B.

[0027] In the figure, 100, button device, 1, key cap, 2, sensor assembly, 21, pressing support plate, 22, sensor, 221, first sensor, 222, second sensor, 23, export welding plate, 24, fixed welding plate, 241, first fixed welding plate, 242, second fixed welding plate, 25, piezoelectric single crystal, 251, substrate, 252, piezoelectric ceramic plate, 200, electronic device, 201, shell, 2011, shell, 2012, through groove. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 2 As shown, an embodiment of the present invention provides an electronic device 200, the electronic device 200 includes a housing 201 and a key device 100 fixed to the periphery of the housing 201; the housing 201 includes a shell 2011 with a receiving space and a through slot 2012 penetrating the periphery of the shell 2011; the key cap 1 is arranged in the through slot 2012, the side of the sensor component 2 close to the key cap 1 is fixed to the inner wall of the shell 2011, and the key cap 1 is exposed or flush with the shell 2011. By pressing the key device 100 in the housing 201, the key cap 1 can provide sufficient pressing rigidity support for finger pressing, and can also bring rich local vibration feedback to the finger, thereby improving the user experience effect.

[0030] Optionally, the electronic device 200 may be a device that requires button operation scenarios, such as a mobile phone, a tablet, headphones, a handle, a steering wheel, and a tablet.

[0031] As an optional embodiment of the present invention, please refer to Figure 3-Figure 6 As shown, an embodiment of the present invention provides a key device 100, which includes a key cap 1 and a sensor assembly 2 fixed to the back pressure surface of the key cap 1, the positive pressure surface of the key cap 1 is used to receive the pressing force, and the sensor assembly 2 is used to detect the pressing force. Optionally, the key cap 1 is annular in structure as a whole, which is easy to install and has a good pressing effect.

[0032] The sensor assembly 2 includes a pressing support sheet 21 fixed to the back pressure surface of the keycap 1, a plurality of sensors 22 fixed to the side of the pressing support sheet 21 away from the keycap 1, a lead-out welding sheet 23 and a fixed welding sheet 24 fixed to the side of the pressing support sheet 21 away from the keycap 1, and a piezoelectric single crystal 25 fixed to the side of the fixed welding sheet 24 away from the keycap 1; the plurality of sensors 22 are spaced apart from each other, and the lead-out welding sheet 23 is located between the plurality of sensors 22; and the orthographic projections of the plurality of sensors 22 and the lead-out welding sheet 23 to the keycap 1 respectively completely fall within the range of the back pressure surface of the keycap 1. The sensors 22, the lead-out welding sheet 23 and the fixed welding sheet 24 are spaced apart from each other. By pressing the keycap 1, the keycap 1 squeezes the pressing support sheet 21, and the pressing action of the human hand is detected by the sensor 22 installed on the pressing support sheet 21. The piezoelectric single chip 25 is pressed through the lead-out welding piece 23, and the corresponding force is fed back to the pressing support sheet 21; so that the key can provide sufficient pressing stiffness support for the finger pressing, and can also bring rich local vibration feedback to the finger, thereby improving the user experience effect.

[0033] In this embodiment, the rigidity of the pressing support sheet 21 is 50-80 N / mm. The pressing support sheet 21 provides rigidity support for the finger pressing the side key. The material is stainless steel. The rigidity of the pressing support sheet 21 is 50-80 N / mm, so that the pressing support sheet 21 has a good support effect.

[0034] In this embodiment, the plurality of sensors 22 include a first sensor 221 and a second sensor 222 fixed at intervals on a side of the pressing support sheet 21 away from the keycap 1, and the orthographic projections of the first sensor 221 and the second sensor 222 to the keycap 1 are respectively located at the two ends of the back pressure surface of the keycap 1. By installing the first sensor 221 and the second sensor 222 at the opposite ends of the pressing support sheet 21 corresponding to the keycap 1, the first sensor 221 and the second sensor 222 can detect light and heavy pressing of the finger, and can also detect the sliding pressing and other behaviors of the finger, thereby enriching the detection effect of the finger pressing behavior.

[0035] In this embodiment, the sensor 22 and the pressing support sheet 21 are fixedly connected by gluing or laser welding, which is convenient to assemble and has a good fixing effect.

[0036] In this embodiment, the sensor 22 is any one of a resistive sensor 22, a piezoelectric sensor 22, a capacitive sensor 22 and an ionization sensor 22. The resistive sensor 22 is used to convert the physical quantity of pressure into a change in resistance value, and has high detection accuracy. The piezoelectric sensor 22 is a sensor 22 based on the piezoelectric effect, and its sensitive element is made of piezoelectric material. The piezoelectric sensor 22 is used to measure force and non-electrical physical quantities that can be converted into electricity. The capacitive sensor 22 is a conversion device that uses various types of capacitors as sensing elements to convert the measured physical quantity or mechanical quantity into a change in capacitance change. In fact, it is a capacitor with variable parameters. The ionization sensor 22 is a sensor 22 that is used to convert the measured change into an ionization current change.

[0037] In this embodiment, the two sides of the lead-out welding piece 23 are respectively fixedly connected to the pressing support piece 21 and / or the piezoelectric single crystal piece 25 by glue bonding or laser welding. This makes the lead-out welding piece 23, the pressing support piece 21 and the piezoelectric single crystal piece 25 have a good fixing effect. The lead-out welding piece 23 connects the piezoelectric single crystal piece 25 and the pressing support piece 21, and transmits the bending vibration of the piezoelectric single crystal piece 25 to the keycap 1.

[0038] In this embodiment, the lead-out welding piece 23 is made of stainless steel, and the thickness of the lead-out welding piece 23 is 0.3-0.5 mm. The stainless steel material has high structural strength and good supporting effect. At the same time, the thickness is thin, which saves cost and installation space.

[0039] In this embodiment, the fixed welding piece 24 includes a first fixed welding piece 241 and a second fixed welding piece 242. The first fixed welding piece 241 and the second fixed welding piece 242 are both fixed between the pressing support piece 21 and the piezoelectric single crystal piece 25. The first fixed welding piece 241 and the second fixed welding piece 242 are arranged at intervals along the length direction of the keycap 1, and play a role in fixing the connection between the piezoelectric single crystal piece 25 and the pressing support piece 21. The lead-out welding piece 23 and the plurality of sensors 22 are both located between the first fixed welding piece 241 and the second fixed welding piece 242. At the same time, the keycap 1 is located between the first fixed welding piece 241 and the second fixed welding piece 242. When the keycap 1 is pressed, the good elastic feedback performance can be improved by pressing the support piece 21, and the vibration feedback is further improved.

[0040] In this embodiment, the two sides of the fixing welding piece 24 are respectively fixedly connected to the pressing support piece 21 and the piezoelectric single crystal piece 25 by glue bonding or laser welding, so that the fixing welding piece 24, the pressing support piece 21 and the piezoelectric single crystal piece 25 have a good fixing effect and are easy to assemble.

[0041] In this embodiment, the fixing welding piece 24 is made of stainless steel, and the thickness of the fixing welding piece 24 is 0.3-0.5 mm. Stainless steel has high structural strength and thin thickness, which saves cost and installation space.

[0042] In this embodiment, the piezoelectric single crystal 25 includes a substrate 251 fixed to the side of the fixed welding piece 24 away from the keycap 1 and a piezoelectric ceramic piece 252 fixed to the side of the substrate 251 away from the keycap 1, the side of the lead-out welding piece 23 away from the keycap 1 is in contact with the substrate 251, and the side of the sensor 22 away from the keycap 1 is spaced from the substrate 251. The substrate 251 is used to install and fix the fixed welding piece 24 and the pressing support piece 21. The piezoelectric ceramic is an information functional ceramic material that can convert mechanical energy and electrical energy into each other - piezoelectric effect, and has sensitive characteristics, so that the key device 100 has a better experience effect.

[0043] In this embodiment, the length of the substrate 251 is greater than the length of the piezoelectric ceramic sheet 252, and the piezoelectric ceramic sheet 252 is arranged opposite to the keycap 1. Further, both ends of the substrate 251 may be provided with through holes penetrating therethrough, and the piezoelectric ceramic sheet 252 is located between the through holes and arranged opposite to the keycap 1. The through holes facilitate the substrate 251 to be fixedly mounted on the housing 2011 of the electronic device 200 by bolts.

[0044] In this embodiment, the substrate 251 is made of stainless steel or beryllium bronze, and the thickness of the substrate 251 is 0.1-0.5 mm. Stainless steel has high structural strength and is thin, which saves cost and installation space.

[0045] In this embodiment, the piezoelectric ceramic sheet 252 is a piezoelectric layer stack structure, and the number of layers of the piezoelectric layer stack structure is between 3 and 20. The piezoelectric layer stack structure has good piezoelectric performance.

[0046] Compared with the related art, in the key device of the present invention, by fixing the sensor assembly on the keycap, the positive pressure surface of the keycap is used to receive the pressing force, and the sensor assembly is used to detect the pressing force; the sensor assembly includes a pressing support plate fixed to the back pressure surface of the keycap, a plurality of sensors fixed to the side of the pressing support plate away from the keycap, an export welding piece and a fixed welding piece fixed to the side of the pressing support plate away from the keycap, and a piezoelectric single crystal fixed to the side of the fixed welding piece away from the keycap; the plurality of sensors are spaced apart from each other, and the export welding piece is located between the plurality of sensors; the orthographic projections of the plurality of sensors and the export welding pieces to the keycap respectively completely fall within the range of the back pressure surface of the keycap; by pressing the keycap, the keycap squeezes the pressing support plate, the sensor installed on the pressing support plate is used to detect the pressing action of the human hand, the export welding piece is used to press the piezoelectric single crystal, and the corresponding force is fed back to the pressing support plate; the key can provide sufficient pressing stiffness support for finger pressing, and can also bring rich local vibration feedback to the finger, thereby improving the user experience effect.

[0047] The above description is only an implementation mode of the present invention. It should be pointed out that, for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present invention, but these all belong to the protection scope of the present invention.

Claims

1. A key device, comprising a key cap and a sensor assembly fixed to the back pressure surface of the key cap, wherein the positive pressure surface of the key cap is used to receive a pressing force, and the sensor assembly is used to detect the pressing force; characterized in that: The sensor assembly comprises a pressing support sheet fixed to the back pressure surface of the keycap, a plurality of sensors fixed to the side of the pressing support sheet away from the keycap, a lead-out welding sheet and a fixed welding sheet fixed to the side of the pressing support sheet away from the keycap, and a piezoelectric single crystal fixed to the side of the fixed welding sheet away from the keycap; the plurality of sensors are spaced apart from each other, and the lead-out welding sheet is located between the plurality of sensors; and the orthographic projections of the plurality of sensors and the lead-out welding sheet to the keycap respectively completely fall within the range of the back pressure surface of the keycap; The plurality of sensors include a first sensor and a second sensor fixed at intervals on a side of the pressing support sheet away from the keycap, wherein the orthographic projections of the first sensor and the second sensor onto the keycap are respectively located at two ends of the back pressure surface of the keycap; The fixed welding piece includes a first fixed welding piece and a second fixed welding piece, the first fixed welding piece and the second fixed welding piece are both fixed between the pressing support piece and the piezoelectric single crystal piece, the first fixed welding piece and the second fixed welding piece are arranged to be spaced apart from each other along the length direction of the key cap, the lead-out welding piece and the plurality of sensors are both located between the first fixed welding piece and the second fixed welding piece; the key cap is located between the first fixed welding piece and the second fixed welding piece.

2. The key device according to claim 1, characterized in that: The stiffness value of the pressing support sheet is 50~80N / mm.

3. The key device according to claim 1, characterized in that: The sensor is any one of a resistive sensor, a piezoelectric sensor, a capacitive sensor and an ionization sensor.

4. The key device according to claim 1, characterized in that: The two sides of the lead-out welding piece are respectively fixedly connected to the pressing support piece and / or the piezoelectric single crystal piece by means of gluing or laser welding.

5. The key device according to claim 1, characterized in that: The lead-out welding piece is made of stainless steel, and the thickness of the lead-out welding piece is 0.3-0.5 mm.

6. The key device according to claim 1, characterized in that: The fixing welding piece is made of stainless steel, and the thickness of the fixing welding piece is 0.3-0.5 mm.

7. The key device according to claim 1, characterized in that: The piezoelectric single crystal comprises a substrate fixed to a side of the fixed welding plate away from the keycap and a piezoelectric ceramic sheet fixed to a side of the substrate away from the keycap, the side of the lead-out welding plate away from the keycap abuts against the substrate, and the side of the sensor away from the keycap is spaced from the substrate.

8. The key device according to claim 7, characterized in that: The length of the substrate is greater than that of the piezoelectric ceramic sheet, and the piezoelectric ceramic sheet is arranged opposite to the key cap.

9. The key device according to claim 7, characterized in that: The substrate is made of stainless steel or beryllium bronze, and the thickness of the substrate is 0.1-0.5 mm.

10. The key device according to claim 7, characterized in that: The piezoelectric ceramic sheet is a piezoelectric layer stack structure, and the number of layers of the piezoelectric layer stack structure is between 3 and 20.

11. An electronic device, characterized in that: The electronic device comprises a housing and a button device as described in any one of claims 1 to 10 fixed to the circumference of the housing; the housing comprises a shell having a receiving space and a through groove running through the circumference of the shell; the keycap is arranged in the through groove, and the side of the sensor component close to the keycap is fixed to the inner wall of the shell, and the keycap is exposed or flush with the shell.

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