Key structure

Abstract

The utility model discloses a button structure, which relates to the field of electronic products, and comprises a circuit board, a button, a button, a button, a button, a button, a button, a button, a button and a button cover, and the button is provided with a function switch and a light source; the light guide assembly comprises a light guide film, the light guide film is attached to the circuit board, an avoiding hole is formed in the light guide film, the light source is arranged in the avoiding hole, the light emitting face faces the center of the light guide film, and light of the light emitting face is emitted out after being reflected by the light guide film; and the elastic sheet is arranged on the circuit board, and the elastic sheet can move towards or back to the circuit board so as to contact or release the contact with the electrical conduction point on the function switch.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic product technical field, especially a key structure. BACKGROUND

[0002] In order to facilitate control, many electronic products have keys, and the indication on the key needs to be lighted to facilitate the quick confirmation of the key of corresponding function and triggering in daytime or night. At present, most of the electronic products on the market adopt LED direct irradiation or refraction to the key through a light guide column to achieve the effect of light guide. However, the relative position of the LED and the key is required to be high, and the light guide effect is not uniform. SUMMARY

[0003] The utility model discloses a key structure, which aims to solve the technical problem of uneven light guide effect.

[0004] To achieve the above-mentioned purpose, the key structure provided by the utility model comprises:

[0005] A circuit board is provided with a function switch and a light source, and the light source is provided with an emitting surface;

[0006] A light guide assembly comprises a light guide film, the light guide film is attached to the circuit board, the light guide film is provided with a relief hole, the light source is arranged in the relief hole, the emitting surface faces the center of the light guide film, and the light of the emitting surface is emitted after being reflected by the light guide film;

[0007] An elastic sheet is arranged on the circuit board, and the elastic sheet can move towards or away from the circuit board to contact or release the electrical conduction point on the function switch. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the structure shown in the drawings without creative labor for those skilled in the art.

[0009] Figure 1 The utility model provides the explosion structure schematic diagram of key structure embodiment part one;

[0010] Figure 2 The utility model provides the explosion structure schematic diagram of another part of key structure embodiment;

[0011] Figure 3 The utility model provides the section structure schematic diagram of key structure embodiment.

[0012] Figure 4 The structure schematic diagram of the key structure embodiment provided by the utility model is shown.

[0013] Explanation of the reference signs:

[0014] 100, circuit board; 110, function switch; 120, light source; 121, light exit surface; 200, light guide film; 210, avoiding hole; 220, first light guide layer; 230, second light guide layer; 231, through hole; 240, connecting part; 250, light guide part; 300, light shielding film; 400, elastic sheet; 500, pressing part; 510, light shielding part; 520, identification part; 600, shell; 610, containing channel; 700, light shielding part; 710, light exit.

[0015] The realization, functional features and advantages of the utility model will be further explained in combination with the embodiments and with reference to the drawings. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the ordinary skilled in the art without making creative efforts belong to the protection scope of the utility model.

[0017] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0018] In addition, if the embodiments of the utility model involve the description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing in the whole text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that the ordinary skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0019] In the prior art, most of the electronic products on the market use LED direct illumination or refraction to the keys through light guide columns to achieve the effect of light guide. However, the relative position of the LED and the key is required to be high, and the light guide effect is not uniform. For example, if the positions of the LED and the light guide column are not aligned, the light guide effect is not uniform, and if the LED is centered, the key triggering position cannot be centered, and the pressing feeling is poor.

[0020] The utility model provides a key structure.

[0021] Please refer to Figures 1 to 4 In an embodiment of the utility model, the key structure comprises: a circuit board 100, a light guide assembly and a spring sheet 400, wherein the circuit board 100 is provided with a function switch 110 and a light source 120, the light source 120 is provided with an emitting surface 121, the light guide assembly comprises a light guide film 200, the light guide film 200 is attached to the circuit board 100, the light guide film 200 is provided with a relief hole 210, the light source 120 is arranged in the relief hole 210, the emitting surface 121 faces the center of the light guide film 200, and the light of the emitting surface 121 is emitted after reflection of the light guide film, the spring sheet 400 is arranged on the circuit board 100, and the spring sheet 400 can move towards or away from the circuit board 100 to contact or release the electrically conductive point on the function switch 110.

[0022] In the embodiment, the function switch 110 and the light source 120 are electrically connected on the circuit board 100, the light source 120 adopts an LED lamp, the emitting surface 121 of the LED lamp is located on the side, and the LED lamp is away from the center position of the light guide film 200, so that the light can be emitted towards the center of the light guide film 200, the light is emitted after reflection of the light guide film 200, and the uniformity of the light is ensured. In order to further improve the uniformity of the light, in an embodiment, the light source 120 is provided with a plurality of light sources 120, the plurality of light sources 120 are arranged around the center of the light guide film 200, and the plurality of light sources 120 all emit light towards the center of the light guide film 200. It should be noted that the plurality of light sources 120 can also realize light guide of multiple colors. Of course, it can be understood that the plurality of light sources 120 also surround the outer periphery of the spring sheet 400 to avoid affecting the pressing of the spring sheet 400 and ensure the feeling of the key.

[0023] In the specific implementation process, the light guide film 200 is pasted on the circuit board 100 and also attached to the surface of the spring sheet 400 away from the circuit board 100, the part corresponding to the light guide film 200 of the spring sheet 400 can reflect light, does not affect the uniformity of the light, and the light guide film 200 also does not affect the pressing of the spring sheet 400. The light guide film 200 adopts white PET material or other light guide materials.

[0024] It should be noted that the function switch 110 on the circuit board 100 is used to realize the switch function of the key, and it can be understood that the function switch 110 has an electrically conductive point, the spring sheet 400 can conduct electricity and contact the electrically conductive point to make the function switch 110 conductive. In the specific implementation process, the material of the spring sheet 400 is metal material, including but not limited to SUS301, SUS304, beryllium copper, phosphor copper and the like. In the embodiment, the spring sheet 400 is a disc structure protruding in the middle, the edge of the spring sheet 400 is electrically connected to the circuit board 100 and has a certain elasticity. The electrically conductive point corresponds to the middle position of the spring sheet 400, the spring sheet 400 moves towards the circuit board 100 to contact the electrically conductive point, so that the function switch 110 is conductive. Correspondingly, the spring sheet 400 resets itself to make the middle position away from the electrically conductive point, and the function switch 110 is disconnected, thereby realizing the key function. It can be understood that the movement of the spring sheet 400 is the deformation of the spring sheet 400 under the action of external force, and the reset of the spring sheet 400 by using the elastic force of the spring sheet 400.

[0025] The utility model discloses technical scheme through adopting light guide film 200 reflection light source 120 light, wherein, light source 120 sets up on the circuit board 100, and light guide film 200 is attached on the circuit board 100, and avoids light source 120 through avoiding hole 210, and the light emitting surface 121 of light source 120 emits light rays towards the center of light guide film 200, and the light rays are evenly reflected by light guide film 200 and emit, in this way, light source 120 does not need to be installed at the center position, and the light rays can also emit evenly. Furthermore, the spring sheet 400 is arranged on the circuit board 100, and the conduction of the function switch 110 is realized by pressing the spring sheet 400, thereby realizing the function of the key. The position of the spring sheet 400 can be set according to actual requirements, thereby improving the feel of the key and the experience of the product. Compared with the prior art of reflecting light rays by using a light guide column, the light source 120 does not need to be installed at the center of the light guide film 200 to realize the effect of uniform light guide. Moreover, the key structure of the technical scheme reflects light rays by using the light guide film 200, which is convenient for miniaturization design and can be used in a relatively narrow space. The spring sheet 400 is pasted on the light guide film 200, thereby simplifying the assembly. The LED lamp of multiple colors can be simultaneously realized to be centrally light-guided, and the spring sheet 400 can also be centrally realized, thereby improving the feel and the experience of the product.

[0026] Reference Figure 3 As shown in the drawings, in an embodiment, the light guide film 200 and the circuit board 100 enclose a cavity, and the spring sheet 400 is arranged in the cavity. Specifically, the middle part of the light guide film 200 is arranged to protrude away from the circuit board 100, thereby forming a cavity between the light guide film 200 and the circuit board 100. The shape of the cavity is adapted to the spring sheet 400, thereby ensuring that the light guide film 200 can be attached to the surface of the spring sheet 400. The part of the light guide film 200 contacting the spring sheet 400 moves synchronously with the spring sheet 400, thereby avoiding affecting the movement of the spring sheet 400 and the experience of key pressing.

[0027] Reference Figure 1 As shown, further, the light guide film 200 includes a first light guide layer 220 and a second light guide layer 230, and the two are adhesively connected, the second light guide layer 230 is provided with a through port 231, the elastic sheet 400 passes through the through port 231 and is adhesively connected to the first light guide layer 220.

[0028] It can be understood that, in the embodiment, in order to improve the light guide effect of the light guide film 200 on reflected light, the first light guide layer 220 and the second light guide layer 230 are stacked. The elastic sheet 400 is connected to the first light guide layer 220, so that the elastic sheet 400 has a light guide layer thereon, further reducing the influence on the elastic sheet 400 and ensuring the pressing feeling of the key. In addition, the elastic sheet 400 is made of metal material, which can also play a light guide effect to a certain extent and reduce the influence on the light.

[0029] In an embodiment, the light guide assembly further includes a light shielding film 300, the light guide film 200 includes a light guide portion 250 and a connecting portion 240 surrounding the outer periphery of the light guide portion 250, and the light shielding film 300 is attached to the connecting portion 240, and the avoidance hole is arranged in the light guide portion 250.

[0030] The light shielding film 300 is in a ring structure and is adhesively connected to the connecting portion 240. In the specific implementation process, the connecting portion 240 is close to the edge of the key, and the edge of the key has a gap. In order to avoid the light from the gap, the light guide film 200 is arranged on the connecting portion 240 to shield the light and improve the light guide effect of the key as a whole. In practice, the light shielding film 300 is black, and the material includes but is not limited to PE, PI, PET, etc. The avoidance hole is arranged in the light guide portion 250, that is, the light source 120 is located in the light guide portion 250 to avoid affecting the light emitted by the light source 120 and ensure the light emitting effect.

[0031] Reference Figure 2 and Figure 3 As shown, in an embodiment, the key structure further includes a pressing piece 500, and pressing the pressing piece 500 moves it in the direction of the elastic sheet 400 to drive the elastic sheet 400 to move towards the electrically conductive point on the circuit board 100.

[0032] In the specific implementation process, when the key is operated to realize the corresponding function of the product, the pressing piece 500 is pressed to move close to the elastic sheet 400, and the middle part of the elastic sheet 400 moves towards the electrically conductive point on the circuit board 100 and contacts the electrically conductive point.

[0033] Further, the center line of the pressing piece 500 coincides with the center line of the elastic sheet 400, and when the pressing piece 500 is pressed, the elastic sheet 400 is further pressed smoothly, and the movement process of the elastic deformation of the elastic sheet 400 can be timely transmitted to the hand, so as to ensure the pressing feeling of the hand, improve the experience of the key and the product. In the specific implementation process, the part of the pressing piece 500 at the center and towards the elastic sheet 400 protrudes towards the elastic sheet 400 and forms a boss, and the boss is used to contact the elastic sheet 400, so that the other part of the pressing piece 500 can avoid the light guide film 200 and the light source 120.

[0034] In an embodiment, the key structure further comprises a shell 600, the shell 600 is provided with a containing channel 610, the pressing piece 500 is movably arranged in the containing channel 610, and the circuit board 100 is fixedly connected with the shell 600.

[0035] In the specific implementation process, the shell 600 cooperates with the pressing piece 500, the pressing piece 500 is movably connected in the containing channel 610, and the circuit board 100 is connected with the shell 600 by screw locking. In this embodiment, the pressing piece 500 is further provided with a limiting ring, the limiting ring cooperates with the shell 600 to limit the displacement of the pressing piece 500 in the direction away from the circuit board 100, so as to avoid that the pressing piece 500 is separated from the shell 600 from the containing channel 610.

[0036] In an embodiment, the key structure further comprises a light shielding piece 700, the light shielding piece 700 is connected with the light shielding film 300, the light shielding piece 700 is provided with a light outlet 710, light is emitted from the light outlet 710, and the light shielding piece 700 further surrounds a shielding space to block the light from being emitted to the shell 600.

[0037] In the specific implementation process, it can be understood that there is a certain space between the pressing piece 500 and the light guide film 200, so as to ensure the movement space of the pressing piece 500, and the light reflected by the light guide film 200 can be emitted through the gap between the pressing piece 500 and the shell 600, thereby affecting the light guide effect of the key.

[0038] In the embodiment, the light shielding member 700 is arranged in the space between the light guide film 200 and the pressing member 500 to shield the light from the gap. Specifically, the light shielding member 700 is provided with the light outlet 710 corresponding to the light-transmitting part of the pressing member 500. In order to improve the light shielding effect of the non-light-transmitting part of the pressing member 500, the light shielding member 700 is in contact with the pressing member 500. In the embodiment, the light shielding member 700 is bent to be away from the light guide film 200 and in contact with the pressing member 500 near the light outlet 710, and the light shielding member 700 is in correspondence with the light shielding film 300 near the edge. In this way, the shielding space formed by the light shielding member 700 can further block the light from the gap between the housing 600 and the pressing member 500, thereby ensuring the light guiding effect. In addition, the shielding space can also avoid the light source 120, so that the light shielding member 700 does not contact the light source 120 when the pressing member 500 moves towards the spring sheet 400. In the specific implementation process, the light shielding member 700 is made of flexible materials such as silica gel or rubber, and the color is black or other colors that can shield light.

[0039] Reference Figure 4 As shown in the figure, in an embodiment, the pressing member 500 includes the light shielding part 510 and the identification part 520 connected with each other, the light shielding part 510 is arranged to be non-light-transmitting, and the identification part 520 is arranged to be light-transmitting. Of course, in order to ensure the light guiding effect of the key, the housing 600 is arranged to be non-light-transmitting.

[0040] The pressing member 500 is made of plastic material, and the light shielding part 510 and the identification part 520 are integrally injection molded. In a specific implementation process, the light shielding part 510 is made of black plastic, and the identification part 520 is made of transparent plastic or white plastic or other colors that can transmit light. In another specific implementation process, the light shielding part 510 and the identification part 520 are both made of transparent or white plastic and are sprayed with a black light shielding layer, and the identification part 520 is formed by removing the light shielding layer by laser.

[0041] The above description is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation or direct / indirect application in other related technical fields under the inventive concept of the utility model and according to the contents of the utility model specification and drawings is included in the patent protection range of the utility model.

Claims

1. A key structure characterized by comprising: The key structure comprises: a circuit board provided with a function switch and a light source, the light source being provided with an emitting surface; a light guide assembly comprising a light guide film, the light guide film being attached to the circuit board, the light guide film being provided with a clearance hole, the light source being arranged in the clearance hole, the emitting surface facing the center of the light guide film, and the light rays of the emitting surface being emitted after being reflected by the light guide film; a spring sheet arranged on the circuit board, the spring sheet being capable of moving towards or away from the circuit board to contact or release the electrically conductive point on the function switch. The light guide film and the circuit board form a cavity, and the spring sheet is arranged in the cavity.

2. The key structure according to claim 1, wherein The light guide film comprises a first light guide layer and a second light guide layer, and the two layers are attached to each other, the second light guide layer being provided with a through hole, and the spring sheet passes through the through hole and is attached to the first light guide layer.

3. The key structure according to claim 1, wherein The light guide assembly further comprises a light shielding film, the light guide film comprises a light guide part and a connecting part surrounding the periphery of the light guide part, the light shielding film is attached to the connecting part, and the clearance hole is arranged in the light guide part.

4. The key structure of claim 1, wherein The key structure further comprises a pressing piece, and pressing the pressing piece makes it move towards the spring sheet to drive the spring sheet to move towards the circuit board to contact the electrically conductive point.

5. The key structure of claim 1, wherein The center line of the pressing piece coincides with the center line of the spring sheet.

6. The key structure according to claim 5, wherein The key structure further comprises a housing, the housing is provided with a receiving channel, the pressing piece is movably arranged in the receiving channel, and the circuit board is fixedly connected with the housing.

7. The key structure according to claim 5, wherein The key structure further comprises a light shielding piece, the light shielding piece is connected with the light shielding film, the light shielding piece is provided with a light emitting hole through which light rays are emitted, and the light shielding piece further forms a shielding space to block the light rays from being emitted towards the housing.

8. The key structure according to claim 7, wherein The pressing piece comprises a light shielding part and an identification part connected with each other, the light shielding part is arranged to be opaque, and the identification part is arranged to be transparent; and / or 9. The key structure of claim 7, wherein The housing is arranged to be opaque. The light source is provided with a plurality of light sources arranged around the center of the light guide film.

10. The key structure of claim 1, wherein ​

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