CN215728929U - Light guide assembly and key mounting structure - Google Patents

Abstract

The utility model provides a light guide assembly and a key mounting structure, and relates to the technical field of backlight keys. According to the utility model, the light emitted by the external light source is more uniform and softer after being conducted by the light guide assembly, so that the uniformity and softness of the light entering the eyes of the backlight key can be improved; in addition, in the process that light emitted by an external light source enters the plate body through the concave surface structure to be transmitted, the reflecting sheet attached to the bottom surface and/or the side wall of the plate body can reflect the light emitted to the bottom surface or the side wall of the plate body back into the plate body, so that the light is prevented from being scattered from the bottom surface and/or the side wall of the plate body, light leakage can be prevented, and the utilization rate of the light can be improved.

Description

Light guide assembly and key mounting structure

Technical Field

The utility model relates to the technical field of backlight keys, in particular to a light guide assembly and a key mounting structure.

Background

In the fields of common medical equipment, instruments, household appliances and the like, the keys of a plurality of pieces of equipment are usually set as backlight keys, and a user is reminded of the use condition of the equipment through light, for example, the backlight keys of the medical equipment are accompanied by flashing light after being pressed to remind workers of keeping alert and paying attention to and dodging, and when the equipment has problems, certain backlight keys can generate light with changed colors for fault warning, preliminary fault troubleshooting and the like.

The backlight key in the existing product usually adopts the LED lamp bead as the backlight source, and the PC lamp shade is added outside the LED lamp bead, or the PVC film is pasted outside the LED lamp bead, so that the uniformity and softness of the light entering the eye are poor, and the user experience is not good enough.

SUMMERY OF THE UTILITY MODEL

The problem to be solved by the utility model is how to improve the uniformity and softness of the light entering the eyes of the backlight key.

In order to solve the above problems, the present invention provides a light guide assembly, which includes a light guide plate, a diffusion sheet, and a reflection sheet, wherein the light guide plate includes a plate body and a concave structure, the concave structure is disposed on a side wall of the plate body and is suitable for light to enter the plate body, the diffusion sheet is suitable for being attached to a light emitting surface of the plate body, and the reflection sheet is suitable for being attached to a bottom surface and/or the side wall of the plate body.

Optionally, the concave surface structures are provided in a plurality, and the plurality of concave surface structures are uniformly distributed along the circumferential direction of the plate body.

Optionally, the light guide plate further includes a plurality of dot structures, the plurality of dot structures are disposed on the light exit surface, and a distance between adjacent dot structures gradually increases in a direction from a center of the light exit surface to an edge of the light exit surface.

Optionally, the light guide plate further includes a first channel structure, the first channel structure is disposed along a height direction and penetrates through the plate body, and the first channel structure is suitable for allowing the key to pass through the plate body to abut against the circuit assembly.

Optionally, the light guide assembly further includes a light guide pillar, and the light guide pillar is disposed on an end face of one side of the diffusion sheet away from the light exit surface and is adapted to accommodate the key.

Optionally, the light guide column comprises a column body, a base and a second channel structure, the column body is arranged on the base, the second channel structure penetrates through the column body and the base along the height direction and is suitable for accommodating the keys, and the base is suitable for being attached to one side end face, away from the light emitting face, of the diffusion sheet.

Compared with the prior art, the utility model has the following beneficial effects:

by arranging the concave surface structure on the side wall of the plate body of the light guide plate, when light emitted by an external light source penetrates through the concave surface structure, because the refraction angles of the light at all positions of the concave surface structure are different, the light can be dispersed into the plate body after being refracted by the concave surface structure, the light entering the plate body is wider in distribution range, meanwhile, the transmission direction of the light can be changed by arranging the reflecting sheet on the bottom surface and/or the side wall of the plate body, part of the light can be transmitted towards the light-emitting surface of the plate body, and the light emitted from the plate body can be further diffused by attaching the diffusing sheet on the light-emitting surface of the plate body, so that the light emitted by the external light source is more uniform and softer after being transmitted by the light guide component, and therefore, the uniformity and the softness of the light entering the eye of a backlight key can be improved; in addition, in the process that light emitted by an external light source enters the plate body through the concave surface structure to be transmitted, the reflecting sheet attached to the bottom surface and/or the side wall of the plate body can reflect the light emitted to the bottom surface or the side wall of the plate body back into the plate body, so that the light is prevented from being scattered from the bottom surface and/or the side wall of the plate body, light leakage can be prevented, and the utilization rate of the light can be improved.

Another objective of the present invention is to provide a key mounting structure to improve uniformity and softness of light entering the backlight key.

In order to solve the above problems, the technical solution of the present invention is realized as follows:

a key mounting structure comprises a key, a circuit component and the light guide component, wherein the light guide component is arranged on the circuit component, and the key is suitable for being accommodated in the light guide component and penetrates through a light guide plate of the light guide component to be abutted against the circuit component.

Optionally, the circuit assembly includes a circuit board, a touch switch and a light source, the touch switch is disposed on the circuit board and adapted to abut against the key, and the light source is disposed on the circuit board and located at a position corresponding to the concave structure of the light guide plate.

Optionally, the key mounting structure further includes a panel, the panel is adapted to cover the circuit component and the light guide component, and the panel is provided with a mounting hole, and the mounting hole is adapted to allow the key to pass through the panel.

Optionally, the key mounting structure further comprises a decoration ring, an annular protrusion is arranged at the edge of the mounting hole, and the decoration ring is suitable for being sleeved on the annular protrusion.

The key mounting structure and the light guide assembly have the same advantages compared with the prior art, and are not described in detail herein.

Drawings

FIG. 1 is a schematic structural diagram of a light guide plate, a diffusion sheet and a reflection sheet of a light guide assembly according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a light guide plate according to an embodiment of the present invention;

FIG. 3 is a schematic view of an assembly of a light guide module and a circuit module according to an embodiment of the present invention;

FIG. 4 is an assembly diagram of the key, the light guide assembly and the circuit assembly according to the embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a key mounting structure according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a circuit assembly according to an embodiment of the utility model.

Description of reference numerals:

the light guide plate comprises a light guide plate 1, a plate body 11, a side wall 111, a light emitting surface 112, a concave surface 12, a dot structure 13, a first channel structure 14, a diffusion sheet 2, a reflection sheet 3, a light guide column 4, a column 41, a column 42, a base 43, a second channel structure 100, a key 200, a circuit module 201, a circuit board 201, a touch switch 202, a light source 203, a panel 300, a mounting hole 301, an annular bulge 302 and a decorative ring 400.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

In the description of the present invention, it is to be understood that the forward direction of "X" in the drawings represents the left direction, and correspondingly, the reverse direction of "X" represents the right direction; the forward direction of "Y" represents forward, and correspondingly, the reverse direction of "Y" represents rearward; the forward direction of "Z" represents the upward direction, and correspondingly, the reverse direction of "Z" represents the downward direction, and the directions or positional relationships indicated by the terms "X", "Y", "Z", etc. are based on the directions or positional relationships shown in the drawings of the specification, and are only for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular direction, be constructed and operated in a particular direction, and thus should not be construed as limiting the present invention. The terms "first" and "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

To solve the above problems, an embodiment of the present invention provides a light guide assembly, which includes a light guide plate 1, a diffusion sheet 2 and a reflection sheet 3, wherein the light guide plate 1 includes a plate body 11 and concave structures 12, the concave structures 12 are disposed on sidewalls 111 of the plate body 11 and are adapted to allow light to enter the plate body 11, the diffusion sheet 2 is adapted to be attached to a light exit surface 112 of the plate body 11, and the reflection sheet 3 is adapted to be attached to a bottom surface (not shown) and/or the sidewalls 111 of the plate body 11.

As shown in fig. 1, in the present embodiment, the plate body 11 of the light guide plate 1 has a plate-shaped structure with a certain thickness, the cross-sectional shape of the plate body may be set to be square, circular or various shapes of a combination thereof according to requirements, the light emitting surface 112 of the plate body 11 may be determined according to the installation manner of the key 100, the key 100 is usually installed above the light guide plate 1, and therefore the light emitting surface 112 of the plate body 11 is usually referred to as an upper end surface thereof.

The concave structure 12 is a structure in which the middle portion is recessed toward the center of the plate body 11, and may be formed by continuously splicing a plurality of planes, or may be a structure having various shapes such as an arc-shaped concave surface, a spherical surface, an irregular curved surface, or a combination thereof, and the concave structure 12 may be integrally formed with the side wall 111 of the plate body 11, without limitation.

The diffusion sheet 2 may be made of a material with high light transmittance, such as PET (polyethylene terephthalate), PC (polycarbonate), or PMMA (organic glass), the cross-sectional shape of the diffusion sheet 2 needs to match the shape of the light exit surface 112, a plurality of reflection sheets 3 may be provided, and the plurality of reflection sheets 3 are respectively provided on the bottom surface (not shown) or the side wall 111 of the plate body 11.

The diffusion sheet 2 and the reflection sheet 3 may be fixed to the light guide plate 1 by screws, an adhesive, or the like, or may be sandwiched between the light guide plate 1 and another component to be bonded to the side wall 111, the light exit surface 112, or the bottom surface of the plate body 11 when mounted.

Since the concave structures 12 are disposed at the joints between the adjacent side walls 111, the reflection sheet 3 attached to the side walls 111 is disposed between the adjacent two concave structures 12 so that light rays that do not affect the external light source enter the board body 11 from the concave structures 12.

By providing the concave structures 12 on the side walls 111 of the plate body 11 of the light guide plate 1, when light emitted from an external light source passes through the concave structures 12, because the refraction angles of the light rays at the positions of the concave structures 12 are different, the light rays can be dispersed into the plate body 11 after being refracted by the concave structures 12, so that the distribution range of the light rays entering the plate body 11 is wider, meanwhile, the reflecting sheet 3 is disposed on the bottom surface and/or the side wall 111 of the board body 11 to change the propagation direction of the light, so that part of the light can propagate toward the light-emitting surface 112 of the board body 11, by attaching the diffusion sheet 2 to the light exit surface 112 of the plate body 11, the light emitted from the plate body 11 can be further diffused, therefore, light rays emitted by the external light source are more uniform and softer after being conducted by the light guide assembly, and therefore the uniformity and softness of the light rays entering the eyes of the backlight keys can be improved.

In addition, in the process that light emitted by an external light source enters the plate body 11 through the concave structure 12 to be transmitted, the reflector plate 3 attached to the bottom surface and/or the side wall 111 of the plate body 11 can reflect the light emitted to the bottom surface or the side wall 111 of the plate body 11 back to the plate body 11, so that the light is prevented from being emitted from the bottom surface and/or the side wall 111 of the plate body 11, light leakage can be prevented, and the utilization rate of the light can be improved.

Optionally, the concave structure 12 is provided in a plurality, and the plurality of concave structures 12 are uniformly distributed along the circumferential direction of the plate body 11.

As shown in fig. 1, the number of the concave structures 12 can be as many as needed, the arrangement manner of the concave structures 12 can be designed according to the cross-sectional shape of the plate body 11, for example, when the plate body 11 is a circular plate body, the concave structures 12 can be arranged at equal intervals along the circumference of the circular plate body, when the plate body 11 is a polygonal plate body, the concave structures 12 can be arranged at the junctions of the sides of the polygonal plate body, in this embodiment, the plate body 11 is a square plate body, and therefore, the number of the concave structures 12 is four, and the four concave structures 12 are respectively arranged at four corners of the square plate body.

Like this, a plurality of concave surface structures 12 that evenly set up along the circumference of plate body 11 agree with more with external light source's position, make into light range distribution wider, more even as advancing the light spot through setting up a plurality of concave surface structures 12, from this, get into the light of plate body 11 inside more even, can promote the button of being shaded and go into the eye homogeneity and the soft nature of light.

Optionally, the light guide plate 1 further includes a plurality of dot structures 13, the plurality of dot structures 13 are disposed on the light-emitting surface 112, and a distance between adjacent dot structures 13 gradually increases in a direction from the center to the edge of the light-emitting surface 112.

As shown in fig. 2, the dot structure 13 may be a concave dot or a convex dot disposed on the upper end surface of the plate body 11, and the dot structure 13 may be disposed on the plate body 11 by means of pasting, silk-screen printing or integral molding, in this embodiment, the dot structure 13 is disposed on the light-emitting surface 112 of the plate body 11 by means of silk-screen printing, and the finished product has strong stereoscopic impression and optical rotation resistance without affecting the glossiness of the plate body 11; the light rays incident into the board 11 are uniformly and softly emitted through the light emitting surface 112 after being scattered or diffusely reflected by the dot structure 13, so that the emitted light rays are uniformly scattered, and the uniformity and the softness of the light rays entering the eyes of the backlight key can be improved.

Preferably, in this embodiment, optical particles may be further disposed in the dot structure 13, the optical particles are uniformly dispersed inside the dot structure, and the optical particles may be titanium dioxide particles or barium sulfate particles with high reflectivity, so as to improve the reflectivity of the dot structure 13; can set up the clearance between the optical particle in every site structure 13, when light jets into plate body 11 through site structure 13, can take place the reflection at the optical particle surface, changes the direction of propagation, and like this, site structure 13 can play diffuse reflection's effect to the light of jetting into, can not form the optical waveguide effect at the bottom surface of plate body 11, avoids the light source extravagant to improve outside light's utilization ratio.

It should be noted that, because light is transmitted along a straight line and has a characteristic of energy loss in the transmission process, and light emitted from the light source is radial, the intensity and density of light entering the plate 11 at the light entrance side are greater than the intensity and density at the center of the plate 11, in order to make the light emitted from the plate 11 more uniform and softer, in this embodiment, the plurality of dot structures 13 may be arranged in a manner that the density is greater in the middle area of the plate 11 and the density is smaller at the light entrance side, for example, the plurality of dot structures 13 are radially distributed on the light exit surface 112 of the plate 11 from the center to the edge of the plate 11, and may be specifically arranged according to the shape of the plate 11, which is not limited herein.

Optionally, the light guide plate 1 further includes a first channel structure 14, the first channel structure 14 is disposed along the height direction and penetrates through the plate body 11, and the first channel structure 14 is adapted to allow the key 100 to pass through the plate body 11 and collide with the circuit assembly 200.

As shown in fig. 1 and 4, since the key 100 and the circuit assembly 200 are respectively disposed above and below the light guide plate 1, in order to not affect the interference between the key 100 and the circuit assembly 200, and to implement the switching function, in the present embodiment, the plate body 11 of the light guide plate 1 is further provided with the first channel structure 14 disposed along the height direction, the first channel structure 14 may be disposed at the center or a position deviated from the center of the plate body 11, for example, the cross-sectional shape of the first channel structure 14 may be a square shape, a circular shape, or various shapes of combinations thereof, and may be specifically disposed according to the installation position and the shape of the key 100, which is not limited herein.

As shown in fig. 1 and 4, the height direction is the Z-axis direction.

It should be noted that, in order to facilitate the up-and-down movement of the key, a guiding structure, such as a guiding post or a guiding hole arranged along the height direction, may be further disposed on the plate body 11 of the light guide plate 1, and a plurality of guiding structures may be uniformly distributed around the first channel structure 14, and may be specifically disposed according to the structural form of the key 100, which is not limited herein.

Optionally, the light guide assembly further includes a light guide pillar 4, the light guide pillar 4 includes a cylinder 41, a base 42 and a second channel structure 43, the cylinder 41 is disposed on the base 42, the second channel structure 43 penetrates through the cylinder 41 and the base 42 along a height direction and is adapted to accommodate the key 100, and the base 42 is adapted to be attached to an end surface of a side of the diffusion sheet 2 away from the light emitting surface 112.

As shown in fig. 3 and 4, the cylinder 41, the base 42, and the second channel structure 43 of the light guide column 4 may be configured to be circular, square, or a combination thereof in various shapes according to installation requirements, the cylinder 41 and the base 42 may be connected by a connector such as a screw or a latch, or integrally formed, the base 42 and the diffusion sheet 2 may be connected by a connector or an adhesive, for example, EVA glue is used to hermetically connect the base 42 and the diffusion sheet 2, a buckle capable of passing through the diffusion sheet may be provided on the light guide plate 1, and the base 42 is fixed on the light guide plate 1 by the buckle to attach the base 42 and the diffusion sheet 2, or another component such as the panel 300 may be sandwiched between the light guide plate 1 to attach the bottom surface of the base 42 and the upper end surface of the diffusion sheet 2, which may be specifically selected according to requirements, and is not limited herein.

In this embodiment, as shown in fig. 3 and 4, the cylinder 41, the base 42 and the second channel structure 43 of the light guide pillar 4 all adopt a structure with a circular cross section, and the light guide pillar 4 adopts an integrated injection molding of an acrylic material, and meanwhile, the surface of the light guide pillar 4 is polished, so that the internal transmittance of the light guide pillar 4 is greater than 92%, the light guide pillar has high transmittance, and the light extraction efficiency and softness can be improved.

In addition, the cylinder 41 and the base 42 with the circular cross section make the light emitted through the light guide column 4 more uniformly distributed, and the inner wall of the second channel structure 43 with the circular cross section is smoother, so that when the key 100 is pressed, the key 100 moves up and down more stably and smoothly.

Another embodiment of the present invention provides a key mounting structure, comprising a key 100, a circuit assembly 200, a panel 300, a decoration ring 400 and the light guide assembly as described above, wherein the circuit assembly 200 comprises a circuit board 201, a touch switch 202 and a light source 203, the touch switch 202 is disposed on the circuit board 201, the light source 203 is disposed on the circuit board 201 and located at a position corresponding to the concave structure 12 of the light guide plate 1, the light guide assembly is disposed on the circuit board 201 of the circuit assembly 200, the key 100 is adapted to be received in the light guide post 4 of the light guide assembly, and the light guide plate 1 passing through the light guide assembly is abutted against the touch switch 202 of the circuit assembly 200, the panel 300 is adapted to cover the circuit assembly 200 and the light guide assembly, the panel 300 is provided with a mounting hole 301 for the key 100 to pass through the panel 300, the edge of the mounting hole 301 is provided with an annular protrusion 302, and the decoration ring 400 is adapted to be sleeved on the annular protrusion 302.

As shown in fig. 5 and 6, in this embodiment, the key 100 is made of a silicone material, the cross-sectional shape of the main structure of the key is circular, so as to facilitate sliding up and down when pressed, four guide posts arranged along the height direction are arranged below the main structure of the key 100, and the four guide posts are distributed along the circumferential direction.

Circuit assembly 200's circuit board 201 is square circuit board, square circuit board's lateral part is equipped with the installation otic placode, connecting pieces such as accessible bolt are installed in the equipment main part, touch switch 202 sets up the center department at circuit board 201, and outside the up end of upwards salient circuit board 201, circuit assembly's light source 203 sets up four angles departments at circuit board 201 up end, also outside the up end of upwards salient circuit board 201, and the lateral surface sets up towards concave surface structure 12 of light guide plate 1, every light source all can adopt the LED lamp, for example, the LED lamp pearl, under the condition that the structure space size allows, still can establish the lamp shade at LED lamp pearl overcoat, adjust the light-emitting angle of LED lamp pearl for circuit board 201 through the lamp shade, for example adopt 90 to 150 light-emitting angle.

The light guide plate 1 of the light guide assembly is disposed on the circuit board 201 of the circuit assembly 200, and the touch switch 202 of the circuit assembly 200 can be accommodated in the first channel structure 14 of the light guide plate 1, the four light sources 203 of the circuit assembly 200 correspond to the four concave structures 12 of the light guide plate 1 one to one, the main structure of the key 100 is accommodated in the second channel structure 43 of the light guide post 4, and the four guide posts of the key 100 can be inserted into the guide holes disposed on the plate body 11 of the light guide plate 1.

The panel 300 is made of plastic, which may be a casing of a device in a normal case, the panel 300 may be connected to a device main body through a connector such as a screw, a mounting hole 301 for mounting the key 100 is opened at a position on the panel 300 corresponding to the key 100, a main structure of the key 100 may be exposed from the mounting hole 301, which facilitates pressing, in order to make the up-and-down movement of the key 100 smoother and more stable, the mounting hole 301 may be set to be slightly larger than the size of the key 100, meanwhile, an annular protrusion 302 may be disposed at an edge of the mounting hole 301, the decoration ring 400 is sleeved on the annular protrusion 302, the decoration ring 400 may be made of a plastic having a different color from the panel 300, which is used for color separation between the key 100 and the panel 300, which facilitates identification of the key 100, and the decoration ring 400 may also perform physical shading to prevent light from being exposed from a gap between the mounting hole 301 and the key 100.

Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present disclosure, and these changes and modifications are intended to be within the scope of the present disclosure.

Claims (10)

1. The light guide assembly is characterized by comprising a light guide plate (1), a diffusion sheet (2) and a reflection sheet (3), wherein the light guide plate (1) comprises a plate body (11) and concave structures (12), the concave structures (12) are arranged on side walls (111) of the plate body (11) and are suitable for light to enter the plate body (11), the diffusion sheet (2) is suitable for being attached to a light emergent surface (112) of the plate body (11), the reflection sheet (3) is suitable for being attached to the bottom surface of the plate body (11) and/or the side walls (111), and the reflection sheet (3) attached to the side walls (111) is arranged between every two adjacent concave structures (12).

2. A light-guiding assembly according to claim 1, wherein said concave structure (12) is provided in plurality, and a plurality of said concave structures (12) are uniformly distributed along the circumference of said plate body (11).

3. The light guide assembly according to claim 1, wherein the light guide plate (1) further comprises a plurality of dot structures (13), the plurality of dot structures (13) are disposed on the light emitting surface (112), and a distance between adjacent dot structures (13) is gradually increased in a direction from a center of the light emitting surface (112) to an edge of the light emitting surface.

4. A light-guiding assembly according to any one of claims 1 to 3, wherein the light-guiding plate (1) further comprises a first channel structure (14), the first channel structure (14) is arranged in the height direction and extends through the plate body (11), and the first channel structure (14) is adapted to allow a key (100) to pass through the plate body (11) and interfere with a circuit assembly (200).

5. The light guide assembly according to claim 4, further comprising a light guide pillar (4), wherein the light guide pillar (4) is disposed on an end surface of the diffusion sheet (2) far away from the light emitting surface (112) and is adapted to receive the key (100).

6. A light guide assembly according to claim 5, wherein the light guide post (4) comprises a cylinder (41), a base (42) and a second channel structure (43), the cylinder (41) is disposed on the base (42), the second channel structure (43) penetrates the cylinder (41) and the base (42) along the height direction and is adapted to accommodate the key (100), and the base (42) is adapted to fit with a side surface of the diffusion sheet (2) away from the light emitting surface (112).

7. A key mounting structure comprising a key (100), a circuit assembly (200) and a light guide assembly according to any one of claims 1 to 6, the light guide assembly being provided on the circuit assembly (200), the key (100) being adapted to be received in the light guide assembly and to abut against the circuit assembly (200) through a light guide plate (1) of the light guide assembly.

8. The key mounting structure according to claim 7, wherein the circuit assembly (200) comprises a circuit board (201), a touch switch (202), and a light source (203), the touch switch (202) is disposed on the circuit board (201) and adapted to collide with the key (100), and the light source (203) is disposed on the circuit board (201) and located at a position corresponding to the concave structure (12) of the light guide plate (1).

9. The key mounting structure according to claim 7 or 8, further comprising a panel (300), wherein the panel (300) is adapted to cover the circuit assembly (200) and the light guide assembly, and a mounting hole (301) is provided on the panel (300), and the mounting hole (301) is adapted to allow the key (100) to pass through the panel (300).

10. The key mounting structure of claim 9, further comprising a decoration ring (400), wherein an annular protrusion (302) is disposed at an edge of the mounting hole (301), and the decoration ring (400) is adapted to fit over the annular protrusion (302).

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