CN220509895U - Replaceable key structure - Google Patents

Abstract

The utility model relates to a replaceable key structure, which comprises a rear shell, a front shell, a first decorative plate, a second decorative plate, a push button, a knob type key and a circuit board, wherein the front shell is provided with a first opening and a second opening; the rear shell is detachably connected with the front shell, and a mounting cavity is formed between the rear shell and the front shell; the front shell is provided with a decorative plate installation area, and the decorative plate installation area is provided with an opening communicated with the installation cavity; the circuit board is arranged in the mounting cavity, and a first touch switch is arranged on the circuit board; the decorative board installation area is detachably connected with a first decorative board or a second decorative board, the first decorative board is provided with an avoidance hole matched with the open hole, and the second decorative board is provided with a through hole communicated with the open hole; the push type key can be in limit fit with the front shell after penetrating through the avoidance hole in the first decorative plate, and can slide relative to the front shell, and can touch the first touch switch; the knob type key is detachably connected with the second decorative plate. The utility model can adapt to different key structures only by replacing fewer parts, and has simple assembly and convenient maintenance.

Description

Replaceable key structure

Technical Field

The utility model relates to the technical field of screen products, in particular to a replaceable key structure.

Background

Along with the rapid development of smart home, screen products are widely applied to the smart home industry, and aiming at different customer groups, the requirements on the screen products are different, the integrity of functions is paid more attention to, the attractiveness of the products is paid more attention to, and the screen products integrating the integrity of functions and the high-grade appearance are needed. This is costly and complex to assemble if multiple products are developed simultaneously for the product itself. For example, the buttons on the screen products are the most common press type buttons and knob type buttons, but most of the existing products cannot be compatible with the two button structures, and often different products are developed according to different button functions, so that the development cost is high, the types and parts of the products are more, and the maintenance of the later products is relatively unfavorable.

Disclosure of Invention

The utility model aims to provide a replaceable key structure which can be adapted to different key structures by replacing fewer parts, and is simple to assemble and convenient to maintain.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a replaceable key structure comprises a rear shell, a front shell, a first decorative plate, a second decorative plate, a push button, a knob button and a circuit board; the first decorative plate corresponds to the push button, the second decorative plate corresponds to the knob type button, and the push button and the knob type button are alternatively used;

the rear shell is detachably connected with the front shell, and a mounting cavity is formed between the rear shell and the front shell; the front shell is provided with a decorative plate installation area, and the decorative plate installation area is provided with an opening communicated with an installation cavity;

the circuit board is arranged in the mounting cavity, a first touch switch is arranged on the circuit board, and the first touch switch is positioned below the opening;

the first decorative plate is provided with an avoidance hole matched with the open hole, and the second decorative plate is provided with a through hole communicated with the open hole;

the push button can be in limit fit with the front shell after passing through the avoidance hole on the first decorative plate, and can slide relative to the front shell; the pressing type key can touch the first touch switch;

the knob type key is detachably connected with the second decorative plate.

The decorative board installation area sets up at least a first setting element, be equipped with on the first decorative board with first setting element one-to-one's second setting element, be equipped with on the second decorative board with first setting element one-to-one's third setting element.

The circuit board is provided with a luminous piece for lighting the push button or the knob button, and the luminous piece is arranged below the opening.

The push button comprises a button plate, a first light guide piece and a first elastic piece, wherein the button plate is glued on the outer side face of the first light guide piece, at least two buckles are uniformly distributed on the inner side face of the first light guide piece in a circumferential mode, clamping holes corresponding to the buckles one by one are formed in the periphery of the opening, each buckle comprises a sliding part and a hook part, one end of each sliding part is connected with the inner side face of the first light guide piece, the other end of each sliding part is connected with the corresponding hook part, the length of each sliding part is larger than the depth of each opening, and when the buckle is inserted into each clamping hole, the corresponding hook part is in limiting fit with the bottom face of each clamping hole; the first elastic piece is abutted between the first light guide piece and the circuit board; the first light guide member is pressed, and the first light guide member can touch the first touch switch.

The first light guide piece is provided with a slip ring matched with the open hole, and the slip ring is in sliding connection with the open hole; the first elastic piece is abutted between the slip ring and the circuit board.

And a limiting ring for limiting the displacement of the first elastic piece is arranged on the periphery of the bottom of the opening.

The outer side face of the first light guide piece is provided with a positioning ring, and the back face of the key board is provided with a positioning groove matched with the positioning ring.

The knob type key comprises a second light guide piece, a fixing piece, a knob inductor, a knob plate and a housing, wherein the fixing piece is inserted into an inner ring of the knob inductor, the inner ring of the knob inductor is non-rotatable relative to the fixing piece, the fixing piece is in limit fit with the inner ring of the knob inductor, and the fixing piece is connected with a second decorative plate through a screw; the knob plate is fixedly connected with the inner ring of the knob inductor, and is also electrically connected with the knob inductor and the circuit board; the outer ring of the knob inductor is detachably connected with the second light guide piece, and the second light guide piece is not rotatable relative to the outer ring of the knob inductor; the outer cover is detachably connected with the second light guide piece, and the outer cover is not rotatable relative to the second light guide piece; the housing and the second light guide member enclose a receiving cavity for receiving the fixing member, the knob sensor and the knob plate.

The knob sensor is in sliding connection with the fixing piece, a second touch switch is arranged on the bottom surface of the knob board, and the second touch switch is connected with the circuit board;

the second touch switch has elasticity, and in a normal state, the second touch switch is abutted against the fixing piece; when the outer cover is pressed, the knob sensor slides relative to the fixing piece, and the fixing piece extrudes and triggers the second touch switch;

and/or a second elastic piece is abutted between the second light guide piece and the second decorative plate; when the outer cover is pressed, the knob sensor slides relative to the fixing piece, and the fixing piece can touch and trigger the second touch switch.

The fixing piece is provided with at least two positioning columns, and the second decorative plate is provided with positioning holes which are matched with the positioning columns one by one; the second decorative plate is provided with a wide-mouth light limiting groove, the knob type key is connected with the light limiting groove, and the bottom of the second light guide piece is provided with an inverted boss matched with the limiting groove.

After the scheme is adopted, the first decorative plate corresponds to the push button, the second decorative plate corresponds to the knob type key, the push button and the knob type key are alternatively used, and the corresponding decorative plate can be replaced when the push button and the knob type key are switched. The utility model can adapt to different key structures only by replacing fewer parts, has low replacement cost, is simple to assemble and is convenient to maintain.

Drawings

FIG. 1 is a schematic diagram of the present utility model when a push button is assembled.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is an enlarged schematic view of the portion a in fig. 2.

Fig. 4 is a partial schematic view of the inside surface of the front shell.

Fig. 5 is an exploded view of a push button.

Fig. 6 is an exploded view of another view of the push button.

Fig. 7 is a sectional view of the push button assembly.

FIG. 8 is a schematic diagram of the present utility model when the knob type key is assembled.

Fig. 9 is an exploded view of a knob type key.

Fig. 10 is an exploded view of another view of the knob type key.

Fig. 11 is a cross-sectional view of a knob type key assembly.

Marking:

a rear case 10;

the front shell 20, the decorative plate mounting area 21, the first positioning piece 22, the opening 23, the clamping hole 24 and the limiting ring 25;

a first decorative plate 30, a second positioning member 31, and a avoidance hole 32;

a second decorative plate 40, a third positioning member 41, a positioning hole 42, a through hole 43, and a light limiting groove 44;

a screen assembly 50;

a circuit board 60, a first touch switch 61, a light emitting member 62;

the push button 70, the button plate 71, the first light guide 72, the first elastic member 73, the positioning ring 74, the positioning groove 75, the slip ring 76, the buckle 77, the sliding part 78, the hook 79;

knob button 80, second light guide 81, first spacing muscle 811, first joint knot 812, second spacing muscle 813, second joint knot 814, fall boss 815, mounting 82, reference column 821, knob inductor 83, first spacing hole 831, first joint hole 832, knob board 84, dustcoat 85, second spacing hole 851, second joint hole 852, second touch switch 86.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

In the description of the embodiments of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship conventionally put in place when the product of the application is used, or the orientation or positional relationship conventionally understood by those skilled in the art, is merely for convenience of describing the present application and simplifying the description, and is not indicative or implying that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the description of the embodiments of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed.

As shown in fig. 1 to 11, the present utility model discloses an alternative key structure comprising a rear case 10, a front case 20, a first decorative plate 30, a second decorative plate 40, a push key 70, a knob key 80 and a circuit board 60. The first decoration plate 30 corresponds to the push button 70, the second decoration plate 40 corresponds to the knob button 80, the push button 70 and the knob button 80 are alternatively used, and the first decoration plate 30 and the second decoration plate 40 are alternatively used.

The rear case 10 and the front case 20 are detachably connected, typically by a screw connection, although other manners such as a clamping connection are also possible. A mounting cavity is formed between the rear case 10 and the front case 20. The front shell 20 is provided with a decorative board installation area 21 and a screen assembly 50 installation area, the two installation areas are mutually independent, the decorative board installation area 21 is used for installing a first decorative board 30 or a second decorative board 40, the first decorative board 30 and the second decorative board 40 are detachably connected with the decorative board installation area 21, and glue joint, clamping and the like can be adopted. In order to ensure that the mounting positions of the first decorative plate 30 and the second decorative plate 40 are accurate, at least one first positioning member 22 (hole) is arranged in the decorative plate mounting area 21, second positioning members 31 (columns) which are in one-to-one fit with the first positioning members 22 are arranged on the first decorative plate 30, and third positioning members 41 (columns) which are in one-to-one fit with the first positioning members 22 are arranged on the second decorative plate 40. The mounting area of the screen assembly 50 is used to mount the screen assembly 50.

The decorative board installation area 21 is provided with an opening 23 communicated with an installation cavity, the circuit board 60 is installed in the installation cavity, the circuit board 60 is provided with a first touch switch 61 and a luminous piece 62, the luminous piece 62 is arranged on the periphery of the first touch switch 61, the first touch switch 61 and the luminous piece 62 are located below the opening 23, and the first touch switch 61 and the luminous piece 62 cannot exceed the opening 23. The first touch switch 61 is used for being matched with the push button 70 to trigger the switch, and the light emitting piece 62 is used for lighting the push button 70 and the knob button 80.

Be equipped with on the first decorative board 30 with trompil 23 complex dodge the hole 32, in this case, dodge the hole 32 and be greater than the trompil 23 setting, and dodge the hole 32 the size be less than push type button 70 adaptation. As shown in fig. 1 to 7, the push button 70 may be in limit fit with the front case 20 after passing through the avoidance hole 32 on the first decorative board 30, and the push button 70 may slide relative to the front case 20, and the push button 70 may touch the first touch switch 61. Specifically, the push button 70 includes a key sheet 71, a first light guide 72, and a first elastic member 73. The key sheet 71 is adhered to the outer surface of the first light guide 72, a positioning ring 74 is provided on the outer surface of the first light guide 72 to facilitate positioning of the key sheet 71, and a positioning groove 75 adapted to the positioning ring 74 is provided on the back surface of the key sheet 71.

The sliding ring 76 matched with the opening 23 is arranged on the inner side surface of the first light guide member 72, and the sliding ring 76 is slidably connected with the opening 23, so that the consistency of the sliding direction of the first light guide member 72 can be ensured. At least two buckles 77 are further arranged on the inner side surface of the first light guide member 72, the buckles 77 are uniformly distributed on the circumference of the outer periphery of the sliding ring 76, clamping holes 24 corresponding to the buckles 77 one by one are formed in the outer periphery of the opening 23, the buckles 77 comprise sliding parts 78 and hook parts 79, one end of each sliding part 78 is connected with the inner side surface of the first light guide member 72, the other end of each sliding part 78 is connected with the hook part 79, and when the buckles 77 are inserted into the corresponding clamping holes 24, the hook parts 79 are in limit fit with the bottom surfaces of the corresponding clamping holes 24. In this case, the length of the sliding portion 78 is required to be greater than the depth of the opening 23, so that the first light guide 72 can slide slightly with respect to the front case 20 after the clip 77 is inserted into the clip hole 24.

The first elastic member 73 is abutted between the slip ring 76 and the circuit board 60, and in order to prevent the first elastic member 73 from running out, a limiting ring 25 for limiting the displacement of the first elastic member 73 is arranged on the outer periphery of the bottom of the opening 23, and the limiting ring 25 can further ensure that the sliding direction of the slip ring 76 is consistent. The first elastic member 73 may employ a cushion foam. The light emitting member 62 is disposed in the inner ring of the first elastic member 73, and the first elastic member 73 can restrict the light source to emit light only in a set direction. Normally, the first light guide 72 is pushed away from the front case 20 by the first elastic member 73, and the first light guide 72 does not contact the first touch switch 61, but contacts the first touch switch 61 when the first light guide 72 is pressed.

As shown in fig. 8-11, the knob type key 80 is detachably connected to the second decorative board 40, in this case, by a screw connection. Specifically, the knob type key 80 includes a second light guide 81, a fixing member 82, a knob sensor 83, a knob plate 84, and a housing 85. Knob sensor 83 is prior art.

The fixing member 82 is inserted into the inner ring of the knob sensor 83 from top to bottom, the inner ring of the knob sensor 83 is not rotatable relative to the fixing member 82, and the fixing member 82 is in limit fit with the inner ring of the knob sensor 83, so that the fixing member 82 cannot completely pass through the inner ring of the knob sensor 83 from top to bottom. The fixing member 82 is screwed to the second decorative plate 40, and thus, the knob sensor 83 can be fixed to the second decorative plate 40. In addition, at least two positioning posts 821 are provided on the fixing member 82, and positioning holes 42 matching with the positioning posts 821 one by one are provided on the second decorative plate 40, so as to facilitate positioning and installation of the fixing member 82.

The knob plate 84 is fixedly connected with the inner ring of the knob sensor 83, the knob sensor 83 is electrically connected with the knob plate 84, and the knob plate 84 is electrically connected with the circuit board 60. The second light guide 81 is sleeved on the periphery of the knob sensor 83, the outer ring of the knob sensor 83 is detachably and fixedly connected with the second light guide 81, the second light guide 81 is non-rotatable relative to the outer ring of the knob sensor 83, a first limit rib 811 and a first clamping buckle 812 can be arranged on the second light guide 81, and a first limit hole 831 matched with the first limit rib 811 and a first clamping hole 832 matched with the first clamping buckle 812 are formed on the periphery of the knob sensor 83. The outer cover 85 is detachably connected with the second light guide member 81, and the outer cover 85 is non-rotatable relative to the second light guide member 81, and may be provided with a second spacing rib 813 and a second clamping buckle 814 on the second light guide member 81, and a second spacing hole 851 matched with the second spacing rib 813 and a second clamping hole 852 matched with the second clamping buckle 814 are provided on the inner side of the outer cover 85. The housing 85 and the second light guide 81 enclose a receiving cavity for receiving the fixing member 82, the knob sensor 83 and the knob plate 84, which can play a protective role.

A through hole 43 communicating with the opening 23 is provided in the second decorative plate 40 to facilitate wiring and light transmission. In order to limit light, a light limiting groove 44 with a wide opening is arranged on the second decorative board 40, a knob type key 80 is connected in the light limiting groove 44, and an inverted boss 815 matched with the limiting groove is arranged at the bottom of the second light guide member 81.

In particular, the inner ring of the knob sensor 83 is slidably connected to the fixing member 82, that is, the knob sensor 83 can be slid by a small amount after the fixing member 82 is screwed to the second decorative plate 40. Meanwhile, a second elastic member is abutted between the second light guide member 81 and the second decorative plate 40, and the second elastic member may be placed in the light limiting groove 44 to achieve hiding. Because the outer cover 85, the second light guiding member 81 and the knob sensor 83 are connected in a synchronous manner, the knob plate 84 is fixed on the knob sensor 83, and the knob plate 84 is kept away from the fixing member 82 under the action of the elastic force of the second elastic member. A second touch switch 86 is provided on the bottom surface of the knob plate 84, and the second touch switch 86 is electrically connected to the knob plate 84. When the cover 85 is pressed, the second touch switch 86 moves relative to the fixing member 82, and the fixing member 82 can touch the second touch switch 86. After the arrangement, the knob type key 80 can rotate the trigger switch and can press the trigger switch, so that the flexibility is higher.

Alternatively, the second elastic member is not provided, so that the second touch switch 86 has a certain elasticity, for example, the contact point of the second touch switch 86 is elastic, and the second touch switch 86 is slightly contacted and cannot be triggered, so that in a normal state, the second touch switch 86 abuts against the fixing member 82, the outer cover 85 is away from the second decorative plate 40, and when the outer cover 85 is pressed, the second touch switch 86 and the fixing member 82 are synchronously pressed, the contact point displacement amount of the second touch switch 86 is increased, and then triggered. Of course, the second elastic member may be added to improve the touch feeling of the key.

When the screen product loaded with the push button 70 needs to be replaced with the knob button 80, only the push button 70 and the first decoration plate 30 need to be detached from the screen product, then the knob button 80 is assembled on the second decoration plate 40, then the knob button 80 is electrically connected with the screen product, and finally the second decoration plate 40 is mounted on the decoration plate mounting area 21 of the screen product. When the screen product with the knob type keys 80 is replaced by the push type keys 70, the knob type keys 80 and the second decoration plates 40 are detached from the screen product, the first decoration plates 30 are mounted on the decoration plate mounting areas 21 of the screen product, and finally the push type keys 70 are connected with the screen product.

In this embodiment, the first decorative board and the second decorative board are made of different materials such as plastics, metals, ceramics, glass, etc. When the user selects different products according to different demands, the user only needs to match the corresponding decorative plates, and the user can select proper materials according to the demands.

The key point of the present utility model is that the first decoration plate 30 corresponds to the push button 70, the second decoration plate 40 corresponds to the knob button 80, the push button 70 and the knob button 80 are alternatively used, and the corresponding decoration plate is replaced when the push button 70 and the knob button 80 are switched. The utility model can adapt to different key structures only by replacing fewer parts, has low replacement cost, is simple to assemble and is convenient to maintain.

The foregoing embodiments of the present utility model are not intended to limit the technical scope of the present utility model, and therefore, any minor modifications, equivalent variations and modifications made to the above embodiments according to the technical principles of the present utility model still fall within the scope of the technical proposal of the present utility model.

Claims (10)

1. The utility model provides a replaceable key structure which characterized in that: the novel portable electronic device comprises a rear shell, a front shell, a first decorative plate, a second decorative plate, a push button, a knob type button and a circuit board; the first decorative plate corresponds to the push button, the second decorative plate corresponds to the knob type button, and the push button and the knob type button are alternatively used;

the rear shell is detachably connected with the front shell, and a mounting cavity is formed between the rear shell and the front shell; the front shell is provided with a decorative plate installation area, and the decorative plate installation area is provided with an opening communicated with an installation cavity;

the circuit board is arranged in the mounting cavity, a first touch switch is arranged on the circuit board, and the first touch switch is positioned below the opening;

the first decorative plate is provided with an avoidance hole matched with the open hole, and the second decorative plate is provided with a through hole communicated with the open hole;

the push button can be in limit fit with the front shell after passing through the avoidance hole on the first decorative plate, and can slide relative to the front shell; the pressing type key can touch the first touch switch;

the knob type key is detachably connected with the second decorative plate.

2. The replaceable key structure of claim 1 wherein: the decorative board installation area sets up at least a first setting element, be equipped with on the first decorative board with first setting element one-to-one's second setting element, be equipped with on the second decorative board with first setting element one-to-one's third setting element.

3. The replaceable key structure of claim 1 wherein: the circuit board is provided with a luminous piece for lighting the push button or the knob button, and the luminous piece is arranged below the opening.

4. A replaceable key structure according to claim 1 or 3, wherein: the push button comprises a button plate, a first light guide piece and a first elastic piece, wherein the button plate is glued on the outer side face of the first light guide piece, at least two buckles are uniformly distributed on the inner side face of the first light guide piece in a circumferential mode, clamping holes corresponding to the buckles one by one are formed in the periphery of the opening, each buckle comprises a sliding part and a hook part, one end of each sliding part is connected with the inner side face of the first light guide piece, the other end of each sliding part is connected with the corresponding hook part, the length of each sliding part is larger than the depth of each opening, and when the buckle is inserted into each clamping hole, the corresponding hook part is in limiting fit with the bottom face of each clamping hole; the first elastic piece is abutted between the first light guide piece and the circuit board; the first light guide member is pressed, and the first light guide member can touch the first touch switch.

5. The replaceable key structure of claim 4 wherein: the first light guide piece is provided with a slip ring matched with the open hole, and the slip ring is in sliding connection with the open hole; the first elastic piece is abutted between the slip ring and the circuit board.

6. The replaceable key structure of claim 4 wherein: and a limiting ring for limiting the displacement of the first elastic piece is arranged on the periphery of the bottom of the opening.

7. The replaceable key structure of claim 4 wherein: the outer side face of the first light guide piece is provided with a positioning ring, and the back face of the key board is provided with a positioning groove matched with the positioning ring.

8. A replaceable key structure according to claim 1 or 3, wherein: the knob type key comprises a second light guide piece, a fixing piece, a knob inductor, a knob plate and a housing, wherein the fixing piece is inserted into an inner ring of the knob inductor, the inner ring of the knob inductor is non-rotatable relative to the fixing piece, the fixing piece is in limit fit with the inner ring of the knob inductor, and the fixing piece is connected with a second decorative plate through a screw; the knob plate is fixedly connected with the inner ring of the knob inductor, and is also electrically connected with the knob inductor and the circuit board; the outer ring of the knob inductor is detachably connected with the second light guide piece, and the second light guide piece is not rotatable relative to the outer ring of the knob inductor; the outer cover is detachably connected with the second light guide piece, and the outer cover is not rotatable relative to the second light guide piece; the housing and the second light guide member enclose a receiving cavity for receiving the fixing member, the knob sensor and the knob plate.

9. The replaceable key structure of claim 8 wherein: the knob sensor is in sliding connection with the fixing piece, a second touch switch is arranged on the bottom surface of the knob board, and the second touch switch is connected with the circuit board;

the second touch switch has elasticity, and in a normal state, the second touch switch is abutted against the fixing piece; when the outer cover is pressed, the knob sensor slides relative to the fixing piece, and the fixing piece extrudes and triggers the second touch switch;

and/or a second elastic piece is abutted between the second light guide piece and the second decorative plate; when the outer cover is pressed, the knob sensor slides relative to the fixing piece, and the fixing piece can touch and trigger the second touch switch.

10. The replaceable key structure of claim 8 wherein: the fixing piece is provided with at least two positioning columns, and the second decorative plate is provided with positioning holes which are matched with the positioning columns one by one; the second decorative plate is provided with a wide-mouth light limiting groove, the knob type key is connected with the light limiting groove, and the bottom of the second light guide piece is provided with an inverted boss matched with the limiting groove.