Light guide module with curved surface light emitting effect

Abstract

The utility model provides a light guide module with a curved surface light emitting effect, which comprises a thin light guide plate which is manufactured in an extrusion forming mode and is provided with a light inlet surface and a light outlet surface, at least one end edge of the thin light guide plate is provided with a first bending section so that the light outlet surface is provided with a curved surface light emitting area, and the thickness of the thin light guide plate is 0.2-0.3 mm. And the light-emitting assembly is used for providing lateral light rays for the thin light guide plate and comprises a flexible printed circuit board and at least one light source, the light source is arranged on the flexible printed circuit board and corresponds to the light incident surface, and the flexible printed circuit board is provided with a second bent arc section corresponding to the first bent arc section. The reflecting piece and the diffusion piece are of bendable structures and are attached to the bottom side and the top side of the thin light guide plate respectively, the thickness of the reflecting piece ranges from 0.05 mm to 0.19 mm, and the thickness of the diffusion piece ranges from 0.05 mm to 0.1 mm. Therefore, the light guide module which is extremely thin in overall thickness and has a curved-surface light-emitting effect can be provided.

Description

Technical Field

[0001] The utility model relates to the field of optical products, in particular to a light guide module with a curved light-emitting effect. Background Art

[0002] The light guide plate is a very common component in current consumer electronic products and is widely used in, for example, displays, backlight modules, lighting devices, laptop computers or keyboards, etc. The main function of the light guide plate is to evenly distribute the light of a point light source onto the plate surface, thereby forming a planar light-emitting effect.

[0003] In the above applications, the light guide plate is mostly required to provide a flat planar light emission. Based on this light-emission requirement, the light guide plate only needs to be designed as, for example, a rectangular body or other polygonal structures with planes. However, with the evolution of consumer electronic products, there are also applications that use the light guide plate as a special light-emitting component, such as the requirement to have a curved light-emitting effect. To achieve the curved light-emitting effect, it can be mainly achieved through, for example, the arrangement of light sources, the structural shape of the light guide plate, the optical microstructures on the light guide plate, etc.

[0004] Injection molding is a very common production method in the field of light guide plate manufacturing. Therefore, injection molding has almost become the manufacturing solution for light guide plates used to provide a curved light-emitting effect today. However, limited by the current injection molding technology, there are still difficulties in the quality or yield of the plate body when manufacturing light guide plates of certain forms. For example, when using injection molding to produce a thin light guide plate, the finished product may be deformed or warped.

[0005] In view of this, the creative team summarized the rich experience of being engaged in the relevant industry for many years, conceived and proposed a light guide module with a curved light-emitting effect, hoping to solve the defects of the prior art. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a light guide module with a curved light-emitting effect, which can be made into a thin light guide plate with a curved surface by an extrusion method, so as to facilitate the provision of a curved light-emitting effect, and the overall thickness is extremely small, and thus can meet the thinness requirements of current electronic devices.

[0007] To achieve the above object, the present utility model discloses a light guide module with a curved surface light-emitting effect in an embodiment, including: a thin light guide plate made by an extrusion molding method, the thin light guide plate having a light incident surface and a light exit surface, and at least one end edge of the thin light guide plate having a first curved arc section, so that the light exit surface has a curved surface light-emitting area, and the thickness of the thin light guide plate is 0.2 to 0.3 mm; a light-emitting component disposed on one side of the thin light guide plate for providing side-incident light to the thin light guide plate, and the light-emitting component includes a flexible printed circuit board and at least one light source, the light source being disposed on the flexible printed circuit board and corresponding to the light incident surface of the thin light guide plate, and the flexible printed circuit board having a second curved arc section corresponding to the first curved arc section; a reflector, being a bendable structure and attached to the bottom side of the thin light guide plate, the thickness of the reflector being 0.05 to 0.19 mm; and a diffuser, being a bendable structure and covering the top side of the thin light guide plate, the thickness of the diffuser being 0.05 to 0.1 mm. Thus, the light guide module realizes the production of a thin light guide plate with a curved surface in an extrusion molding manner, and at the same time, based on the above size conditions, the light guide module has the advantage of extremely thin thickness, which is beneficial to providing a curved surface light-emitting effect while meeting the requirement of thinness.

[0008] Further, in one embodiment, the opposite two end edges of the thin light guide plate are respectively provided with the first curved arc section, so that the light exit surface has two curved surface light-emitting areas, and the flexible printed circuit board has two second curved arc sections corresponding to the first curved arc section, so that the light guide module has two curved surface light-emitting areas.

[0009] In addition, in another embodiment, it is disclosed that the minimum diameter of the curved arc section is 19 to 26 mm to form a more appropriate curved arc state.

[0010] In still another embodiment, it is disclosed that the thickness of the flexible printed circuit board is 0.15 to 0.2 mm, and it can also have a thinness performance.

[0011] In summary, the light guide module with a curved surface light-emitting effect of the present utility model can produce a thin light guide plate with a curved surface by bending an extruded thin plate, and is matched with reflectors and diffusers with specific thickness dimensions, thereby constituting an optical product with an extremely thin thickness and a curved surface light-emitting effect, which is beneficial to being applied in various thin electronic products to provide a curved surface light-emitting function. Further, regarding the additional technical features that can be continued for the present utility model, the present utility model also proposes some examples as described in the above paragraphs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic exploded view of the structure of the light guide module according to an embodiment of the present utility model.

[0013] Figure 2 Partial cross-sectional schematic view of a thin light guide plate according to an embodiment of the present utility model. Specific embodiments

[0014] Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

[0015] As described above, in order to provide a light guide product with a curved surface light emitting effect that has a high production yield and quality and meets the current demand for thinness, the present utility model proposes a light guide module with a curved surface light emitting effect. The following will describe the light guide module in detail with diagrams and text. The structural dimensions, ratios, sizes, shapes, or application states shown in each figure are only for illustration, used to illustrate the technical features of the present utility model, and do not represent the actual structural design. This is hereby stated first.

[0016] Please refer to Figure 1 , which is an exploded schematic view of the structure of a light guide module according to an embodiment of the present utility model. A light guide module 1 with a curved surface light emitting effect proposed by the present utility model includes a thin light guide plate 10, a light emitting component 11, a reflecting member 12, and a diffusing member 13.

[0017] The thin light guide plate 10 is made by an extrusion method. The thin light guide plate has a light incident surface 101 and a light emitting surface 102, and at least one end edge of the thin light guide plate 10 has a first arc segment 103, so that the light emitting surface 102 has a curved surface light emitting area 1021. The thickness of the thin light guide plate 10 is 0.2 - 0.3 mm. Among them, according to the position of the set end edge of the first arc segment 103, the light incident surface 101 of the thin light guide plate 10 can also have a curved surface light incident area 1011 in response to the first arc segment 103, as Figure 1 shown. In this embodiment, the light emitting surface 102 is the top side surface of the thin light guide plate 10, and the light incident surface 101 is the side surface of the thin light guide plate 10, that is, the plane in the thickness direction.

[0018] The light emitting component 11 is disposed on one side of the thin light guide plate 10 for providing side-incident light to the thin light guide plate 10. The light emitting component 11 includes a flexible printed circuit board 111 and at least one light source 112. The light source 112 is disposed on the flexible printed circuit board 111 and corresponds to the light incident surface 101 of the thin light guide plate 10. The flexible printed circuit board 111 has a second arc segment 1111 corresponding to the first arc segment 103. In this embodiment, the light source 112 is an LED and is arranged in plural, and the light sources 112 are arranged at intervals on the flexible printed circuit board 111. Among them, when the light incident surface 101 of the thin light guide plate 10 has a curved surface light incident area 1011 in response to the first arc segment 103, the arrangement of the light sources 112 can extend to the position of the second arc segment 1111 to provide incident light for the bent portion of the thin light guide plate 10.

[0019] The reflector 12 is a bendable structure and is attached to the bottom side of the thin light guide plate 10, and the thickness of the reflector 12 is 0.05 - 0.19 mm. In principle, the reflector 12 can be in the form of a film material structure with an extremely thin thickness. After being attached to the thin light guide plate 10, it can form a curved surface structure state according to its structure. In order to facilitate the representation of the state of the reflector 12 after being bent according to the shape of the thin light guide plate 10, in Figure 1 it is shown as a decomposed schematic with the reflector 12 in a bent state. Through the reflector 12, part of the light can be prevented from spilling out from the bottom side of the thin light guide plate 10, so as to enhance the light utilization rate.

[0020] The diffuser 13 is also a bendable structure and covers the top side of the thin light guide plate 10, and the thickness of the diffuser 13 is 0.05 - 0.1 mm. Similar to the reflector 12, the diffuser 13 also belongs to a film material structure with an extremely thin thickness. After covering the top side of the thin light guide plate 10, it can form a curved surface structure state according to the structure of the thin light guide plate 10. In Figure 1 it is selected to show the diffuser in a bent state as a schematic to represent its state after being bent according to the shape of the thin light guide plate 10. Through the diffuser 13, the outgoing light can be more diffused, so as to enhance the performance of light emission uniformity.

[0021] In an application state, first bending segments 103 can be respectively provided at the opposite two end edges of the thin light guide plate 10, so that the light emitting surface 102 has two curved surface light emitting areas 1021, and the flexible printed circuit board 111 correspondingly has two second bending segments 1111 corresponding to the first bending arc segments 103. Accordingly, the effect of bilateral curved surface light emission can be formed. Based on the foregoing example, in this structural state, the light incident surface 101 will have two curved surface light incident areas 1011 along with the structures of the two first bending segments 103.

[0022] In addition, considering the overall thickness performance of the module, the thickness of the flexible printed circuit board 111 can be further limited. In an implementation state, the thickness of the flexible printed circuit board 111 can be 0.15 - 0.2 mm, so that the light emitting component 11 also has the characteristic of being thin.

[0023] Please also continue to refer to Figure 2 , which is a partial cross-sectional schematic view of the thin light guide plate according to an embodiment of the present utility model. In an implementation state, the minimum diameter of the first bending arc segment 103 is 19 - 26 mm, for example, it can be 20 mm, 25 mm, etc. Making the minimum diameter of the first bending arc segment 103

[0024] In summary, the light guide module with a curved light-emitting effect of the present utility model can provide an optical product in the market that includes a thin light guide plate with a curved structure made by an extrusion method. This method is especially not limited by the size of the light guide plate, and has the advantage of being convenient for producing light guide plates with excellent quality for various lighting requirements. In the light guide module, the thin light guide plate, the reflector, and the diffuser all have certain size limitations to cooperate with each other to achieve a better curved light-emitting effect and meet the trend of thinness in current electronic products. Further, based on the light-emitting requirements of the electronic device equipped with the light guide module, the thin light guide plate can have first bending sections at both opposite edges to provide the effect of double-end curved light emission; considering the overall thickness performance of the module, it can also be achieved by restricting the thickness of the flexible printed circuit board, for example, making its thickness 0.15 - 0.2 mm, so that the light-emitting component also has the characteristic of thinness; in addition, to enable the thin light guide plate to have a better curved performance, the minimum diameter of the first curved arc section can be further made 19 - 26 mm to achieve a better curved structure state and avoid affecting the structural performance of the curved light-emitting area due to too large or too small a diameter.

[0025]

Explanation of Reference Numerals

[0026] 1 Light guide module

[0027] 10 Thin light guide plate

[0028] 101 Light incident surface

[0029] 1011 Curved light incident area

[0030] 102 Light exit surface

[0031] 1021 Curved light-emitting area

[0032] 103 First curved arc section

[0033] 11 Light-emitting component

[0034] 111 Flexible printed circuit board

[0035] 1111 Second curved arc section

[0036] 112 Light source

[0037] 12 Reflector

[0038] 13 Diffuser

[0039] The minimum diameter of the first curved arc section.

Claims

1. A light guide module with curved light emitting effect, characterized in that: Include: A thin light guide plate is made by extrusion molding, the thin light guide plate has a light incident surface and a light emitting surface, and at least one end edge of the thin light guide plate has a first curved arc segment, so that the light emitting surface has a curved surface light emitting area, and the thickness of the thin light guide plate is 0.2-0.3 mm; a light emitting component, disposed on one side of the thin light guide plate, for providing side-entry light to the thin light guide plate, and the light emitting component comprises a flexible printed circuit board and at least one light source, the light source is disposed on the flexible printed circuit board and corresponds to the light incident surface of the thin light guide plate, and the flexible printed circuit board has a second curved arc segment corresponding to the first curved arc segment; a reflector, which is a bendable structure and is attached to the bottom side of the thin light guide plate, and the thickness of the reflector is 0.05-0.19 mm; and A diffusion member is a bendable structure and covers the top side of the thin light guide plate. The thickness of the diffusion member is 0.05-0.1 mm.

2. The light guide module with curved light emitting effect according to claim 1, characterized in that: in, The two opposite end edges of the thin light guide plate are respectively provided with the first curved arc segments, so that the light emitting surface has two curved surface light emitting areas, and the flexible printed circuit board has two second curved arc segments corresponding to the first curved arc segments.

3. The light guide module with curved light emitting effect according to claim 1, characterized in that: in, The minimum diameter of the first curved arc segment is 19-26 mm.

4. The light guide module with curved light emitting effect according to claim 1, characterized in that: in, The thickness of the flexible printed circuit board is 0.15-0.2 mm.

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