Switch assembly

Abstract

The utility model provides a switch assembly, which relates to the technical field of switches and is applied to a range hood, the range hood is provided with a through hole matched with the switch assembly, the switch assembly comprises a light-transmitting sheet, a circuit board, an upper cover plate and a lower cover plate, the circuit board is arranged between the upper cover plate and the lower cover plate, and the light-transmitting sheet is provided with a boss mechanism. The boss mechanism is used for being attached to a circuit board, the circuit board comprises an induction area and a non-induction area, under the condition that the switch assembly is matched with the range hood, the non-induction area is located between the induction area and the through hole, and the relative distance between the induction area and the through hole is larger than or equal to 5 mm. According to the switch assembly, the light-transmitting piece is matched with the boss mechanism, a user can easily operate in the induction area and set the relative distance between the induction area and the through hole, the anti-static capacity of the switch assembly is improved, the misoperation risk of the range hood is reduced, and the use feeling of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a switch component. Background Art

[0002] Traditional household appliances generally use mechanical push-button switches as their switch components. Mechanical push-button switches usually use a combination of mechanical structure and electronic circuits to achieve the on and off of the switch. Mechanical push-button switches have poor appearance and are prone to wear and tear during long-term use. They are also poorly resistant to water vapor and oil, which affects the normal use of the switch. Currently, some household appliances also use LCD switches, which are expensive and increase product costs. LCD switches are surrounded by metal and are easily affected by static electricity. They have poor heat resistance, oil resistance, and water resistance, which limits the applicable environment of LCD switches, thereby affecting user experience and maintenance costs. Utility Model Content

[0003] The purpose of the present utility model is to provide a switch assembly with good display effect and strong anti-static ability to improve the user experience in order to solve at least one of the above-mentioned existing technical problems.

[0004] The utility model provides a switch assembly, which is applied to a range hood. The range hood is provided with an assembly through hole matched with the switch assembly. The switch assembly comprises a light-transmitting sheet, a circuit board, an upper cover plate, and a lower cover plate. The circuit board is arranged between the upper cover plate and the lower cover plate. The light-transmitting sheet is provided with a boss mechanism, and the boss mechanism is used to fit with the circuit board.

[0005] The circuit board includes a sensing area and a non-sensing area. When the switch assembly is matched with the range hood, the non-sensing area is located between the sensing area and the through hole. The relative distance between the sensing area and the assembly through hole is greater than or equal to 5 mm.

[0006] In a possible implementation manner, the light-transmitting sheet includes an inner wall and an outer wall, the inner wall is arranged on a side close to the circuit board, the outer wall is arranged on a side away from the circuit board, and the friction coefficient of the inner wall is greater than or equal to the friction coefficient of the outer wall.

[0007] In a possible implementation manner, the sensing area is provided with a display film and a light-emitting device, and the light-emitting device is connected to the display film.

[0008] In a possible implementation manner, the upper cover plate is welded to the light-transmitting sheet, and the upper cover plate is sealed and connected to the lower cover plate.

[0009] In a possible implementation manner, an elastic mechanism is further included, the lower cover plate is provided with at least one fixing column, and the elastic mechanism is sleeved on the fixing column.

[0010] In a possible implementation manner, the light transmittance of the light-transmitting sheet is less than or equal to 50%.

[0011] In a possible implementation manner, at least one fastener through hole is provided on the lower cover plate, and the lower cover plate and the upper cover plate are fixedly connected by assembling a fastener in the fastener through hole.

[0012] In a possible implementation manner, the light-transmitting sheet includes at least one chamfered portion, and a radius of the chamfered portion is 1 mm-5 mm.

[0013] In a possible implementation manner, a first protrusion mechanism and a second protrusion mechanism are provided on the outer wall of the lower cover plate, and the first protrusion mechanism and the second protrusion mechanism are staggeredly arranged along the length direction of the lower cover plate.

[0014] In a possible implementation manner, the light-transmitting sheet includes a first edge and a second edge, and the first edge and the second edge are arranged in parallel.

[0015] The distance between the center of the boss mechanism and the first edge is greater than the distance between the center of the boss mechanism and the second edge.

[0016] In a possible implementation manner, it further includes an assembly plate, the assembly plate is connected to the lower cover plate, and the assembly plate is provided with a hanging ear, the hanging ear is used to assemble with the range hood

[0017] The switch assembly provided by the utility model has the following beneficial effects:

[0018] The utility model provides a switch assembly, which is applied to a range hood. The range hood is provided with a through hole matched with the switch assembly. The switch assembly includes a light-transmitting sheet, a circuit board, an upper cover plate, and a lower cover plate. The circuit board is arranged between the upper cover plate and the lower cover plate. The light-transmitting sheet is provided with a boss mechanism, which is used to fit with the circuit board. The circuit board includes a sensing area and a non-sensing area. When the switch assembly is matched with the range hood, the non-sensing area is located between the sensing area and the through hole, and the relative distance between the sensing area and the through hole is greater than or equal to 5 mm. The light-transmitting sheet and the boss mechanism are matched, and the user can easily operate in the sensing area. The relative distance between the sensing area and the through hole is greater than or equal to 5 mm, which improves the anti-static ability of the switch assembly, reduces the risk of misoperation of the range hood, and improves the user's sense of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is an exploded view of a switch assembly in an embodiment of the utility model;

[0021] Figure 2 is a top view of the light-transmitting sheet in the embodiment of the utility model;

[0022] Figure 3 is a side view of the light-transmitting sheet in the embodiment of the utility model;

[0023] Figure 4 is a schematic diagram of a display film in an embodiment of the utility model;

[0024] Figure 5 It is a structural schematic diagram of the upper cover plate in the embodiment of the utility model;

[0025] Figure 6 It is a structural schematic diagram of the upper cover plate in the embodiment of the utility model;

[0026] Figure 7 It is a structural schematic diagram of the lower cover plate in the embodiment of the utility model;

[0027] Figure 8 It is a structural schematic diagram of the lower cover plate in the embodiment of the utility model;

[0028] Fig. 9 It is a structural schematic diagram of a mounting plate in an embodiment of the utility model;

[0029] Fig.10 It is a structural schematic diagram of the mounting plate in the embodiment of the utility model.

[0030] The following is a supplementary description of the attached drawings:

[0031] 10. Translucent sheet; 11. Boss mechanism; 20. Circuit board; 21. Display film; 30. Upper cover plate; 40. Lower cover plate; 41. Fixing column; 42. First protruding mechanism; 43. Second protruding mechanism; 50. Elastic mechanism; 60. Assembly plate; 61. Hanging ear; 70. Assembly through hole. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] The term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present application. In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may include one or more of the features explicitly or implicitly. Moreover, the terms "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described here can be implemented in an order other than those illustrated or described here.

[0034] See also Figure 1-8 A switch assembly is applied to a range hood. The range hood is provided with an assembly through hole 70 that matches with the switch assembly. The switch assembly includes a light-transmitting sheet 10, a circuit board 20, an upper cover plate 30 and a lower cover plate 40. The circuit board 20 is arranged between the upper cover plate 30 and the lower cover plate 40. The light-transmitting sheet 10 is provided with a boss mechanism 11. The boss mechanism 11 is used to fit with the circuit board 20. The circuit board 20 includes a sensing area and a non-sensing area. When the switch assembly matches with the range hood, the non-sensing area is located between the sensing area and the assembly through hole 70. The relative distance between the sensing area and the through hole is greater than or equal to 5 mm. The light-transmitting sheet 10 and the boss mechanism 11 match, and the user can easily operate in the sensing area. The relative distance between the sensing area and the through hole is greater than or equal to 5 mm, which improves the electrostatic discharge immunity and antistatic ability of the switch assembly, reduces the risk of misoperation of the range hood, and improves the user's sense of use.

[0035] Specifically, the range hood is provided with an assembly through hole 70, the switch assembly cooperates with the range hood, the switch assembly can adjust the use status of the range hood, the light-transmitting sheet 10 is exposed to the user's field of vision, and the light-transmitting sheet 10 is used to display the status of the switch assembly.

[0036] Specifically, the range hood includes a mounting plate, the mounting plate is a metal mounting plate, and the assembly through hole 70 is a metal through hole. When the switch assembly is matched with the range hood, the sensing area does not contact the edge of the metal through hole, thereby improving the touch reliability of the switch assembly.

[0037] Specifically, the switch assembly is a capacitive switch assembly. When a user touches the light-transmitting sheet 10, the display film 21 obtains changes in the touch position and transmits these signals to the circuit board 20 (PCBA). The PCBA receives the touch signal transmitted by the display film 21 and processes the signal through a built-in controller to adjust the use status of the range hood.

[0038] Specifically, the light-transmitting sheet 10 includes an inner wall and an outer wall, the inner wall is arranged on a side close to the circuit board 20, and the outer wall is arranged on a side away from the circuit board 20, and the friction coefficient of the inner wall is greater than or equal to the friction coefficient of the outer wall. The friction coefficient of the inner wall is greater than the friction coefficient of the outer wall, which can effectively reduce the generation and accumulation of static electricity, reduce the impact of static electricity interference on the display effect, and improve the display effect. The light-transmitting sheet 10 can also optimize light transmission and diffusion effects and improve the visual experience. The light-transmitting sheet 10 can effectively filter out reflections, watermarks and other effects.

[0039] Specifically, the inner wall is frosted and the outer wall is smooth, so that the friction coefficient of the inner wall is greater than or equal to the friction coefficient of the outer wall. The user directly contacts the outer wall. When the switch component is in the illuminated state, the light propagates from the inner wall to the outer wall.

[0040] In one embodiment, the material of the light-transmitting sheet 10 is a black MABS light-transmitting sheet. This light-transmitting sheet has high hardness, high temperature resistance, scratch resistance, and fingerprint resistance. When a user comes into contact with the outer wall of the light-transmitting sheet 10, the user experience is improved.

[0041] Specifically, the sensing area is provided with a display film 21 and a light emitting device, and the light emitting device is connected to the display film 21. The display film 21 cooperates with the light emitting device to achieve a colorful display effect, meeting the display requirements of different occasions and needs.

[0042] Specifically, the display film 21 is an ITO color film, and the light emitting device is a patch light emitting diode. Compared with the TFT color screen, the ITO color film and the patch light emitting diode solution has a lower manufacturing cost and a relatively simple production process, which saves production costs. The solution of ITO color film and patch light emitting diode can be customized according to demand, and the size, shape, color and other aspects are more flexible, which is suitable for the display needs of different application scenarios.

[0043] Specifically, the ITO color film and the SMD light emitting diode are arranged on the circuit board 20, and the ITO color film and the SMD light emitting diode are connected.

[0044] Specifically, ITO color film is a conductive transparent film that can be used as a sensor for touch screens. When a user touches the screen, the ITO color film senses the change in the touch position and transmits these signals to the PCBA. The PCBA receives the touch signal transmitted by the ITO color film and processes the signal through a built-in controller. The controller identifies the touch position, gesture and other information and converts it into corresponding control instructions. According to the control instructions, the PCBA controls the contact between the spring and the metal backplane to achieve the closing or opening of the switch. When the user touches the screen, the PCBA receives the signal and controls the state of the switch, thereby achieving control of the device. PCBA can control the brightness and color of the LED to meet different display requirements.

[0045] Specifically, the upper cover plate 30 is welded to the light-transmitting sheet 10, and the upper cover plate 30 is sealed and connected to the lower cover plate 40. The welding of the upper cover plate 30 and the light-transmitting sheet 10 and the sealed connection of the upper cover plate 30 and the lower cover plate 40 effectively prevent external substances such as dust, water vapor and liquid from entering the interior of the switch assembly, and protect the circuit board 20 from damage and corrosion.

[0046] Specifically, the upper cover plate 30 and the lower cover plate 40 are made of PC+ABS blended material, and the upper cover plate 30 and the lower cover plate 40 are mixed with polycarbonate PC and acrylonitrile-butadiene-styrene ABS. Polycarbonate PC has excellent heat resistance, impact resistance and transparency, while acrylonitrile-butadiene-styrene ABS has good wear resistance, chemical corrosion resistance and processability. Therefore, the PC+ABS blended material combines the advantages of the two raw materials and has high strength, high heat resistance, high impact resistance and good processability.

[0047] Specifically, the upper cover plate 30 and the light-transmitting sheet 10 are connected by ultrasonic welding, and the upper cover plate 30 and the lower cover plate 40 and the lead-out line interface points are sealed with waterproof glue to strengthen the sealing connection.

[0048] Furthermore, an elastic mechanism is included, and the lower cover plate 40 is provided with at least one fixing column 41, and the elastic mechanism is sleeved on the fixing column 41. When the upper cover plate 30 is connected to the lower cover plate 40, the elastic mechanism is used to support the circuit board 20, and then the circuit board 20 is fitted with the light-transmitting sheet 10. The elastic mechanism can help adjust the position of the circuit board 20, assist in keeping the light-transmitting sheet 10 flat, and ensure the display effect of the switch assembly.

[0049] In an exemplary embodiment, the elastic mechanism is a spring. When the lower cover plate 40 is connected to the upper cover plate 30 , the fixing column 41 is arranged on the side of the lower cover plate 40 close to the upper cover plate 30 , and the spring is used to support the circuit board 20 to fit with the light-transmitting sheet 10 .

[0050] Specifically, the fixing columns 41 and the fastener through holes do not interfere with each other, and the fixing columns 41 are symmetrically arranged.

[0051] Specifically, the light transmittance of the light-transmitting sheet 10 is less than or equal to 50%. When the switch assembly is not in use, the switch assembly is basically in a pure black state. The light-transmitting sheet 10 can effectively control the degree of light transmission and provide a more comfortable visual experience. The light-transmitting sheet 10 can also enhance the reflection effect of light, increase the degree of light diffusion, and improve the display effect of the switch assembly.

[0052] Specifically, the light-transmitting sheet 10 is made black, and when the switch assembly is not in use, the switch assembly faces the direction of the mounting plate and is connected to the mounting plate, and the switch assembly does not display lighting effects. When the switch assembly is in use, the light-transmitting sheet 10 is used to display lighting effects and the user can judge the usage status of the range hood based on the display effect of the switch assembly.

[0053] Specifically, at least one fastener through hole is provided on the lower cover plate 40, and the lower cover plate 40 and the upper cover plate 30 are fixedly connected by assembling fasteners in the fastener through holes. By using fasteners for fixed connection, it is possible to ensure that the connection between the lower cover plate 40 and the upper cover plate 30 is firm and stable, thereby increasing the stability and durability of the overall structure of the switch assembly. When it is necessary to maintain or replace internal components such as the circuit board 20, the lower cover plate 40 can be quickly disassembled by fasteners, which facilitates maintenance and replacement operations.

[0054] In an exemplary embodiment, the lower cover plate 40 is provided with four fastener through holes, and the upper cover plate 30 is provided with four fastener mounting holes. During the assembly process, the fasteners pass through the fastener through holes and the fastener mounting holes, and the lower cover plate 40 is fixedly connected to the upper cover plate 30.

[0055] Specifically, the transparent sheet 10 includes at least one chamfered portion, and the radius of the chamfered portion is 1mm-5mm. Chamfering the transparent sheet 10 can reduce the sharpness of its edge, reduce stress concentration, reduce the probability of cracking of the transparent sheet 10, and increase the service life of the switch assembly.

[0056] Specifically, in an exemplary embodiment, the light-transmitting sheet 10 is chamfered on all sides, and the curvature radius of the chamfer is 2 mm.

[0057] Specifically, a first protrusion mechanism 42 and a second protrusion mechanism 43 are provided on the outer wall of the lower cover plate 40, and the first protrusion mechanism 42 and the second protrusion mechanism 43 are staggered along the length direction of the lower cover plate 40. By providing an asymmetric protrusion structure, the assembly of the lower cover plate 40 and the assembly plate 60 is facilitated, and the production efficiency and installation efficiency are improved.

[0058] Specifically, the outer wall of the lower cover plate 40 is located at a side away from the upper cover plate 30 , and the first protrusion mechanism 42 and the second protrusion mechanism 43 are asymmetric about the central axis in the length direction of the lower cover plate 40 and / or the width direction of the lower cover plate 40 .

[0059] Specifically, the light-transmitting sheet 10 includes a first edge and a second edge, the first edge and the second edge are arranged in parallel, and the distance between the center of the boss mechanism 11 and the first edge is greater than the distance between the center of the boss mechanism 11 and the second edge. Setting the distance between the center of the boss mechanism 11 and the first edge is greater than the distance between the center of the boss mechanism 11 and the second edge can effectively prevent the light-transmitting sheet 10 from being reversely installed during production and assembly.

[0060] In one embodiment, the light-transmitting sheet 10 includes a first edge, a second edge, a third edge and a fourth edge, wherein the first edge and the second edge are arranged opposite to each other, the first edge and the third edge and the fourth edge are arranged adjacent to each other, and the third edge and the fourth edge are arranged in parallel.

[0061] Specifically, the distance between the center of the boss mechanism 11 and the first edge is greater than the distance between the center of the boss mechanism 11 and the second edge, thereby determining the installation direction of the light-transmitting sheet 10 .

[0062] Furthermore, it also includes an assembly plate 60, which is connected to the lower cover plate 40, and is provided with a hanging ear 61, which is used to assemble with the range hood. The design of the hanging ear 61 can facilitate the assembly of the switch assembly and the range hood, facilitate disassembly and maintenance, improve the assembly efficiency of the product, and ensure that the connection between the light-transmitting sheet 10 and the range hood is firm and stable.

[0063] Specifically, the assembly plate 60 is made of metal. After the lower cover plate 40 is connected to the assembly plate 60, the switch assembly is detachably connected to the mounting plate of the range hood. A mounting portion that cooperates with the hanging ear 61 is provided on the inner wall of the mounting plate. The mounting portion is arranged inside the range hood. By connecting the hanging ear 61 and the mounting portion, the switch assembly is connected to the mounting plate.

[0064] The following describes the installation process of the switch assembly in the embodiment of the present application in combination with a specific application scenario, which is as follows:

[0065] First, the circuit board 20 (PCBA) is fixed on the fixing column 41 of the lower plastic shell, the circuit board 20 is completely fitted with the lower plastic shell, the SMD light emitting diode on the display film 21 is connected to the circuit board 20, and the ITO color film is attached to the light-transmitting film 10, ensuring that the ITO color film is consistent with the display area on the circuit board 20;

[0066] Then, the light-transmitting sheet 10 and the upper plastic shell are sealed by ultrasonic welding to ensure that the light-transmitting sheet 10 and the upper plastic shell are completely fitted, and a spring is installed on the lower plastic shell, so that the circuit board 20 and the light-transmitting sheet 10 are completely fitted;

[0067] Waterproof glue is set at the bottom of the lower plastic shell, the lead-out line interface is sealed, the left-right asymmetry of the light-transmitting sheet 10 and the asymmetry of the protrusion of the lower plastic shell are designed to prevent assembly errors, and then the switch assembly is assembled correctly.

[0068] The following introduces specific embodiments of the present application based on the above technical solution.

[0069] Example 1

[0070] See also Figure 1-8 The present embodiment provides a switch assembly, which is applied to a range hood. The range hood is provided with an assembly through hole 70 that cooperates with the switch assembly. The switch assembly includes a light-transmitting sheet 10, a circuit board 20, an upper cover plate 30 and a lower cover plate 40. The circuit board 20 is arranged between the upper cover plate 30 and the lower cover plate 40. The light-transmitting sheet 10 is provided with a boss mechanism 11. The boss mechanism 11 is used to fit with the circuit board 20. The circuit board 20 includes a sensing area and a non-sensing area. When the switch assembly cooperates with the range hood, the non-sensing area is located between the sensing area and the assembly through hole 70. The relative distance between the sensing area and the through hole is greater than or equal to 5 mm. The sensing area is provided with a display film 21 and a light-emitting device. The light-emitting device is connected to the display film 21. The display film 21 is an ITO color film, and the light-emitting device is a surface-mounted light-emitting diode. The range hood includes a mounting plate, which is a metal mounting plate. The assembly through hole 70 is a metal through hole. When the switch assembly cooperates with the range hood, the sensing area does not contact the edge of the metal through hole. The switch assembly further includes an assembly plate 60 , which is connected to the lower cover plate 40 . A hanging ear 61 is provided on the assembly plate 60 , and the hanging ear 61 is used for assembly with the range hood.

[0071] The light-transmitting sheet 10 includes an inner wall and an outer wall. The inner wall is arranged on a side close to the circuit board 20, and the outer wall is arranged on a side away from the circuit board 20. The friction coefficient of the inner wall is greater than or equal to the friction coefficient of the outer wall. The inner wall of the light-transmitting sheet 10 is frosted. The material of the light-transmitting sheet 10 is a transparent black MABS light-transmitting sheet 10, and the light transmittance of the light-transmitting sheet 10 is less than or equal to 50%. The light-transmitting sheet 10 is chamfered all around, and the radius of the chamfered portion is 2 mm.

[0072] The upper cover plate 30 is welded to the light-transmitting sheet 10, and the upper cover plate 30 is sealed and connected to the lower cover plate 40. The upper cover plate 30 and the lower cover plate 40 are made of PC+ABS blended material, and the upper cover plate 30 and the light-transmitting sheet 10 are connected by ultrasonic welding. The upper cover plate 30 and the lower cover plate 40 and the lead-out line interface point are sealed and connected with waterproof glue to strengthen the sealing connection. Four fastener through holes are provided on the lower cover plate 40, and the lower cover plate 40 and the upper cover plate 30 are fixedly connected by assembling fasteners in the fastener through holes.

[0073] The switch assembly also includes an elastic mechanism. The lower cover plate 40 is provided with four fixing columns 41 . Springs are sleeved on the fixing columns 41 . The springs are used to support the circuit board 20 to fit the light-transmitting sheet 10 .

[0074] Example 2

[0075] The common points between Example 2 and Example 1 are not repeated here. The difference between Example 2 and Example 1 is that a first protrusion mechanism 42 and a second protrusion mechanism 43 are provided on the outer wall of the lower cover plate 40, and the first protrusion mechanism 42 and the second protrusion mechanism 43 are arranged staggered along the length direction of the lower cover plate 40. The light-transmitting sheet 10 includes a first edge and a second edge, and the first edge and the second edge are arranged in parallel. The distance between the center of the boss mechanism 11 and the first edge is greater than the distance between the center of the boss mechanism 11 and the second edge. By setting an asymmetric light-transmitting sheet 10 and the lower cover plate 40, the installation direction of the light-transmitting sheet 10 and the lower cover plate 40 is clarified, thereby improving the assembly efficiency of the switch assembly.

[0076] The above disclosures are only several preferred embodiments of the present invention, which cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A switch assembly, applied to a range hood, the range hood being provided with an assembly through hole (70) cooperating with the switch assembly, characterized in that: The switch assembly comprises a light-transmitting sheet (10), a circuit board (20), an upper cover plate (30), and a lower cover plate (40); the circuit board (20) is arranged between the upper cover plate (30) and the lower cover plate (40); the light-transmitting sheet (10) is provided with a boss mechanism (11); the boss mechanism (11) is used to fit with the circuit board (20); The circuit board (20) comprises a sensing area and a non-sensing area. When the switch assembly is matched with the range hood, the non-sensing area is located between the sensing area and the assembly through hole (70), and the relative distance between the sensing area and the through hole is greater than or equal to 5 mm.

2. The switch assembly according to claim 1, characterized in that The light-transmitting sheet (10) comprises an inner wall and an outer wall, the inner wall being arranged on a side close to the circuit board (20), the outer wall being arranged on a side away from the circuit board (20), and the friction coefficient of the inner wall being greater than or equal to the friction coefficient of the outer wall.

3. The switch assembly according to claim 1, characterized in that The sensing area is provided with a display film (21) and a light-emitting device, and the light-emitting device is connected to the display film (21).

4. The switch assembly according to any one of claims 1 to 3, characterized in that: The upper cover plate (30) is welded to the light-transmitting sheet (10), and the upper cover plate (30) and the lower cover plate (40) are sealed and connected.

5. The switch assembly according to any one of claims 1 to 3, characterized in that: It also comprises an elastic mechanism, the lower cover plate (40) is provided with at least one fixing column (41), and the elastic mechanism is sleeved on the fixing column (41).

6. The switch assembly according to any one of claims 1 to 3, characterized in that: The light transmittance of the light-transmitting sheet (10) is less than or equal to 50%.

7. The switch assembly according to any one of claims 1 to 3, characterized in that: At least one fastener through hole is provided on the lower cover plate (40), and the lower cover plate (40) and the upper cover plate (30) are fixedly connected by assembling a fastener in the fastener through hole.

8. The switch assembly according to any one of claims 1 to 3, characterized in that: The light-transmitting sheet (10) comprises at least one chamfered portion, and the radius of the chamfered portion is 1 mm-5 mm.

9. The switch assembly according to any one of claims 1 to 3, characterized in that: A first protrusion mechanism (42) and a second protrusion mechanism (43) are arranged on the outer wall of the lower cover plate (40); the first protrusion mechanism (42) and the second protrusion mechanism (43) are arranged in a staggered manner along the length direction of the lower cover plate (40).

10. The switch assembly according to any one of claims 1 to 3, characterized in that: The light-transmitting sheet (10) comprises a first edge and a second edge, wherein the first edge and the second edge are arranged in parallel. The distance between the center of the boss mechanism (11) and the first edge is greater than the distance between the center of the boss mechanism (11) and the second edge.

11. The switch assembly according to any one of claims 1 to 3, characterized in that: It also comprises an assembly plate (60), wherein the assembly plate (60) is connected to the lower cover plate (40), and a hanging ear (61) is provided on the assembly plate (60), and the hanging ear (61) is used for assembling with the range hood.

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