Lens for lighting device and lighting device

Abstract

The lens (2) comprises a lens light inlet face and a lens light outlet face, the lens light inlet face is used for facing a light source of the lighting device, and in the longitudinal section, cut in the length direction (X) of the lens, of the lens, the lens light outlet face is used for facing the light source of the lighting device. The light incident surface of the lens is zigzag and comprises a plurality of light incident surface straight parts and a plurality of light incident surface inclined parts, the light incident surface straight parts and the light incident surface inclined parts are arranged in a staggered mode in the length direction (X) of the lens, sawteeth of the lens are in an asymmetric shape, the arrangement directions of the sawteeth are the same, and the light incident surface straight parts and the light incident surface inclined parts are arranged in a staggered mode in the length direction (X) of the lens. The light incident surface straight part is parallel to the length direction (X), and the light incident surface inclined part is inclined relative to the length direction (X).

Description

Technical Field

[0001] This application belongs to the technical field of lighting, and particularly relates to a lens for a lighting device and a lighting device. Background Art

[0002] Table lamps have an illuminance uniformity performance index. It is generally believed that table lamps with a smaller illuminance uniformity value have an eye protection effect. The illuminance uniformity is measured according to the test method of GB / T9473, that is, the ratio of the highest brightness to the lowest brightness in a specific test area. According to different uniformities, table lamps can be classified into AA grade and A grade, and the AA grade has a smaller uniformity value.

[0003] For long strip-shaped table lamps, the diffused reflection matte lenses in the prior art are difficult to meet the requirements of higher illuminance uniformity. Utility Model Content

[0004] This application aims to propose a lens for a lighting device, so that the illumination brightness after the light passes through the lens can be distributed in a specific manner. This application also proposes a lighting device including the above lens.

[0005] This application proposes a lens for a lighting device. The lens includes a lens light incident surface and a lens light exit surface. The lens light incident surface is used to face the light source of the lighting device.

[0006] In the longitudinal section of the lens intercepted along the length direction of the lens, the lens light incident surface is serrated and includes a plurality of flat incident surface portions and a plurality of inclined incident surface portions. The flat incident surface portions and the inclined incident surface portions are arranged alternately along the length direction of the lens. Each serration of the lens is an asymmetric shape, and the arrangement directions of the serrations are the same. The flat incident surface portion is parallel to the length direction, and the inclined incident surface portion is inclined with respect to the length direction.

[0007] In at least one possible implementation, the flat incident surface portion is a cylindrical curved surface that protrudes towards the light source. The axis of the cylindrical curved surface extends along the length direction of the lens. The inclined incident surface portion is a conical curved surface that protrudes towards the light source. The axis of the conical curved surface extends along the length direction of the lens.

[0008] In at least one possible implementation, the flat incident surface portion is connected to the top of the inclined incident surface portion.

[0009] In at least one possible implementation, the ratio of the depth of the inclined incident surface portion in the thickness direction of the lens to the length in the length direction is 0.5 to 2.

[0010] In at least one possible implementation, the length ratio of the flat part of the light incident surface to the inclined part of the light incident surface in the length direction of the lens is greater than 0 and less than or equal to 2.

[0011] In at least one possible implementation, the light exit surface includes a plurality of convex arc surfaces, the axis of the arc surface extends along the length direction of the lighting device, and the plurality of arc surfaces are arranged along the width direction of the lighting device.

[0012] This application also provides a lighting device, including a light source and the lens according to any one of the above technical solutions, and the light exit surface of the light source faces the light incident surface of the lens.

[0013] In at least one possible implementation, the lighting device includes at least two such lenses, and at least two lenses are symmetric with respect to the midline in the length direction of the lighting device.

[0014] In at least one possible implementation, the inclined part of the light incident surface gets closer to the light exit surface as it extends towards the midline in the length direction of the lighting device.

[0015] In at least one possible implementation, the light source includes a plurality of lamp beads, and in the width direction of the lighting device, at least part of the lamp beads are located at the middle position of the flat part of the light incident surface or the inclined part of the light incident surface.

[0016] By adopting the above technical solutions, the illumination brightness of the light passing through the lens can be distributed in a specific pattern.

[0017] In a preferred solution, the lighting device of this application can stack two lenses that are symmetric in the length direction, so that the illumination uniformity of the lighting device in the length direction is better. Description of the Drawings

[0018] Figure 1 Shows a schematic structural diagram of a lighting device according to an embodiment of the present application.

[0019] Figure 2 Shows a schematic structural diagram of the lighting device according to an embodiment of the present application from another angle.

[0020] Figure 3 Shows a schematic structural diagram of a lighting device (one lens is not shown) according to an embodiment of the present application.

[0021] Figure 4 Shows a cross-sectional view of the lighting device according to an embodiment of the present application in a plane perpendicular to the length direction.

[0022] Figure 5Shows a cross-sectional perspective view of a lighting device according to an embodiment of the present application in a plane perpendicular to the length direction.

[0023] Figure 6 Shows a partial cross-sectional view of a lighting device according to an embodiment of the present application in a plane perpendicular to the width direction.

[0024] Figure 7 Shows a partial cross-sectional perspective view of a lighting device according to an embodiment of the present application in a plane perpendicular to the width direction.

[0025] Figure 8 Shows a schematic diagram of a partial structure of a lens of a first light-emitting unit of a lighting device according to an embodiment of the present application.

[0026] Explanation of reference numerals

[0027] A First light-emitting unit B Second light-emitting unit

[0028] 1 Light source 11 Light source board 12 Lamp beads

[0029] 2 Lenses 21 Lens incident surface 22 Lens exit surface 23 Plane portion

[0030] 20A Lens of the first light-emitting unit 21A Incident surface of the lens of the first light-emitting unit 211A Flat portion of the incident surface of the lens of the first light-emitting unit 212A Inclined portion of the incident surface of the lens of the first light-emitting unit 22A Exit surface of the lens of the first light-emitting unit

[0031] 20B Lens of the second light-emitting unit 21B Incident surface of the lens of the second light-emitting unit 211B Flat portion of the incident surface of the lens of the second light-emitting unit 212B Inclined portion of the incident surface of the lens of the second light-emitting unit 22B Exit surface of the lens of the second light-emitting unit

[0032] X Length direction Y Width direction Z Thickness direction Detailed implementation manners

[0033] In order to more clearly elaborate the above-mentioned objects, features and advantages of the present application, the detailed implementation manners of the present application are described in detail in this part in conjunction with the accompanying drawings. In addition to the various implementation manners described in this part, the present application can also be implemented in other different ways. Without departing from the spirit of the present application, those skilled in the art can make corresponding improvements, deformations and substitutions. Therefore, the present application is not limited by the specific embodiments disclosed in this part. The protection scope of the present application shall be subject to the claims.

[0034] As Figures 1 to 8 shown, an embodiment of the present application provides a lighting device. The lighting device can be a lamp such as a table lamp. It can be understood that the lighting device is not limited to a table lamp and can also be a floor lamp, a ceiling lamp, etc. The lighting device includes a first light-emitting unit A and a second light-emitting unit B.

[0035] As shown Figures 1 to 3 , the first light-emitting unit A and the second light-emitting unit B are arranged along the length direction X of the lighting device. The first light-emitting unit A and the second light-emitting unit B can be rectangular or strip-shaped, and the length direction X of the first light-emitting unit A and the second light-emitting unit B is consistent with the length direction X of the lighting device. The width direction Y of the first light-emitting unit A and the second light-emitting unit B (see Figure 4 ) is consistent with the width direction Y of the lighting device.

[0036] Both the first light-emitting unit A and the second light-emitting unit B include a light source 1 and a lens 2.

[0037] The light source 1 can be an LED light source. The light source 1 includes a light source board 11 and a plurality of lamp beads 12. The lamp beads 12 can be arranged on the front surface of the light source board 11. The plurality of lamp beads 12 can be arranged in rows along the length direction X of the lighting device, and the lamp beads 12 can be arranged in one row or multiple rows. The lamp beads 12 of the first light-emitting unit A and the second light-emitting unit B can be arranged on the same light source board 11.

[0038] As Figures 4 to 8 shown, the lens 2 includes a lens incident surface 21 and a lens exit surface 22. The lens incident surface 21 faces the lamp beads 12 of the light source 1, the light exit surface 121 of the lamp beads 12 faces the lens incident surface 21, and the light emitted by the light source 1 can enter the lens 2 from the lens incident surface 21 and exit from the lens exit surface 22. The lens 2 can be plate-shaped as a whole.

[0039] Optionally, the lens 2 can be made of a material with a refractive index between 1.3 and 1.7. For example, the lens 2 can be made of polymethyl methacrylate (PMMA) material.

[0040] The lens incident surface 21 includes an incident surface flat portion and an incident surface inclined portion. The incident surface flat portion includes the first light-emitting unit lens incident surface flat portion 211A and the second light-emitting unit lens incident surface flat portion 211B. The incident surface inclined portion includes the first light-emitting unit lens incident surface inclined portion 212A and the second light-emitting unit lens incident surface inclined portion 212B.

[0041] As Figure 2 , Figure 4 and Figure 5 shown, the lens exit surface 22 can include a convex arc surface, and the axis of the arc surface can extend along the length direction X of the lighting device. Further, the lens exit surface 22 can include a plurality of arc surfaces, and the plurality of arc surfaces can be arranged along the width direction Y of the lighting device.

[0042] As Figures 6 to 8As shown, the lens 20A of the first light-emitting unit includes a light-incident surface 21A of the lens of the first light-emitting unit and a light-emitting surface 22A of the lens of the first light-emitting unit. The light-incident surface 21A of the lens of the first light-emitting unit faces the light-emitting surface 121 of the light source, and the light emitted by the light source 1 can irradiate the light-incident surface 21A of the lens of the first light-emitting unit.

[0043] The light-incident surface 21A of the lens of the first light-emitting unit includes a flat portion 211A of the light-incident surface of the lens of the first light-emitting unit and an inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit.

[0044] In the thickness direction Z of the lighting device, the flat portion 211A of the light-incident surface of the lens of the first light-emitting unit is connected to the top of the inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit (i.e., the portion close to the light source 1, the position of the edge of the recessed opening).

[0045] The flat portion 211A of the light-incident surface of the lens of the first light-emitting unit and the inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit may be arranged alternately along the length direction X of the lens 2. Refer to Figure 6 and Figure 7 , when observing along the width direction Y of the lighting device, the continuously arranged flat portion 211A of the light-incident surface of the lens of the first light-emitting unit and the inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit may form a serrated shape. Each serration of the lens 20A of the first light-emitting unit is an asymmetric shape, and the arrangement directions of the serrations are the same. The lens 20A of the first light-emitting unit can guide the light to irradiate more towards one end in the length direction X, so that the illumination brightness of the light passing through the lens 20A of the first light-emitting unit can gradually change (show a specific distribution). Here, each serration refers to a convex portion or a concave portion in the periodically convex or concave serrated shape on the light-incident surface 21A of the lens of the first light-emitting unit.

[0046] The flat portion 211A of the light-incident surface of the lens of the first light-emitting unit is parallel to the light-emitting surface 121 of the light source and parallel to the length direction X. The inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit is inclined with respect to the light-emitting surface 121 of the light source and inclined with respect to the length direction X.

[0047] Refer to Figure 4 , Figure 8 , the flat portion 211A of the light-incident surface of the lens of the first light-emitting unit may be a cylindrical curved surface, and this cylindrical curved surface may protrude towards the light source 1, and the axis of the cylindrical curved surface extends along the length direction X of the lighting device.

[0048] Refer to Figure 4 , Figure 8 , the inclined portion 212A of the light-incident surface of the lens of the first light-emitting unit may be a conical curved surface, and this conical curved surface may protrude towards the light source 1, and the axis of the conical curved surface extends along the length direction X of the lighting device.

[0049] It can be understood that refer toFigures 5 to 8 In this embodiment, a concave pit is formed on the incident light surface 21A of the first light-emitting unit lens by the inclined portion 212A of the incident light surface of the first light-emitting unit lens. However, the inclined portion 212A of the incident light surface of the first light-emitting unit lens bulges towards the light source 1 as the bottom surface of the concave pit.

[0050] By arranging the flat portion 211A of the incident light surface of the first light-emitting unit lens and the inclined portion 212A of the incident light surface of the first light-emitting unit lens continuously, the illumination brightness of the light emitted by the first light-emitting unit can be gradually changed (showing a specific distribution) in the length direction X of the first light-emitting unit.

[0051] In the width direction Y of the lighting device, at least part of the lamp beads 12 are located at the middle positions of the flat portion 211A of the incident light surface of the first light-emitting unit lens or the inclined portion 212A of the incident light surface of the first light-emitting unit lens.

[0052] Furthermore, in the width direction of the lighting device, the lens 20A of the first light-emitting unit can be provided with multiple sets of the flat portion 211A of the incident light surface of the first light-emitting unit lens and the inclined portion 212A of the incident light surface of the first light-emitting unit lens. For example, in this embodiment, in the width direction of the lighting device, the lens 20A of the first light-emitting unit can be provided with two sets of the flat portion 211A of the incident light surface of the first light-emitting unit lens and the inclined portion 212A of the incident light surface of the first light-emitting unit lens.

[0053] Furthermore, the ratio of the depth of the inclined portion 212A of the incident light surface of the first light-emitting unit lens in the thickness direction Z of the first light-emitting unit A to the length in the length direction X of the first light-emitting unit A is 0.5 to 2.

[0054] Furthermore, the length ratio of the flat portion 211A of the incident light surface of the first light-emitting unit lens to the inclined portion 212A of the incident light surface of the first light-emitting unit lens in the length direction X of the lens is greater than 0 and less than or equal to 2. It can be understood that the proportion of the flat portion 211A of the incident light surface of the first light-emitting unit lens can approach 0.

[0055] As Figure 7 and Figure 8 shown, the lens 20B of the second light-emitting unit includes the incident light surface 21B of the second light-emitting unit lens and the outgoing light surface 22B of the second light-emitting unit lens. The incident light surface 21B of the second light-emitting unit lens faces the outgoing light surface 121 of the light source, and the light emitted by the light source 1 can irradiate the incident light surface 21B of the second light-emitting unit lens.

[0056] The incident light surface 21B of the second light-emitting unit lens includes the flat portion 211B of the incident light surface of the second light-emitting unit lens and the inclined portion 212B of the incident light surface of the second light-emitting unit lens.

[0057] In the thickness direction Z of the lighting device, the flat portion 211B of the light incident surface of the second light emitting unit lens is connected to the top of the inclined portion 212B of the light incident surface of the second light emitting unit lens (i.e., the portion close to the light source 1, the position of the edge of the recessed opening).

[0058] The flat portion 211B of the light incident surface of the second light emitting unit lens and the inclined portion 212B of the light incident surface of the second light emitting unit lens may be arranged alternately along the length direction X of the lens 2. When observed in the width direction Y of the lighting device, the continuously arranged flat portion 211B of the light incident surface of the second light emitting unit lens and the inclined portion 212B of the light incident surface of the second light emitting unit lens may form a sawtooth shape. Each sawtooth of the lens 20B of the second light emitting unit has an asymmetric shape, and the arrangement directions of the sawteeth are the same. The lens 20B of the second light emitting unit can guide the light to irradiate more towards one end in the length direction X, so that the illumination brightness of the light passing through the lens 20B of the second light emitting unit can gradually change (show a specific distribution). Here, each sawtooth refers to a convex portion or a concave portion in the periodically convex or concave sawtooth shape on the light incident surface 21B of the second light emitting unit lens.

[0059] The flat portion 211B of the light incident surface of the second light emitting unit lens is parallel to the light emitting surface 121 of the light source and parallel to the length direction X. The inclined portion 212B of the light incident surface of the second light emitting unit lens is inclined with respect to the light emitting surface 121 of the light source and inclined with respect to the length direction X.

[0060] Refer to Figure 4 、 Figure 8 The flat portion 211B of the light incident surface of the second light emitting unit lens may be a cylindrical curved surface, and the cylindrical curved surface may protrude towards the light source 1, and the axis of the cylindrical curved surface extends along the length direction X of the lighting device.

[0061] Refer to Figure 4 、 Figure 8 The inclined portion 212B of the light incident surface of the second light emitting unit lens may be a conical curved surface, and the conical curved surface may protrude towards the light source 1, and the axis of the conical curved surface extends along the length direction X of the lighting device.

[0062] It can be understood that referring to Figures 5 to 8 In this embodiment, the inclined portion 212B of the light incident surface of the second light emitting unit lens forms a concave pit on the light incident surface 21B of the second light emitting unit lens, but the bottom surface of the inclined portion 212B of the light incident surface of the second light emitting unit lens as the concave pit protrudes towards the light source 1.

[0063] Through the continuously arranged flat portion 211B of the light incident surface of the second light emitting unit lens and the inclined portion 212B of the light incident surface of the second light emitting unit lens, the light emitted by the second light emitting unit can gradually change in illumination brightness in the length direction X of the second light emitting unit (show a specific distribution).

[0064] In the width direction Y of the lighting device, at least part of the lamp beads 12 are located at the middle position of the flat part 211B of the light incident surface of the second light emitting unit lens or the inclined part 212B of the light incident surface of the second light emitting unit lens.

[0065] Furthermore, in the width direction of the lighting device, multiple groups of the flat part 211B of the light incident surface of the second light emitting unit lens and the inclined part 212B of the light incident surface of the second light emitting unit lens can be provided on the lens 20B of the second light emitting unit. For example, in the present embodiment, in the width direction of the lighting device, two groups of the flat part 211B of the light incident surface of the second light emitting unit lens and the inclined part 212B of the light incident surface of the second light emitting unit lens can be provided on the lens 20B of the second light emitting unit.

[0066] Furthermore, the ratio of the depth of the inclined part 212B of the light incident surface of the second light emitting unit lens in the thickness direction Z of the second light emitting unit B to the length of the second light emitting unit B in the length direction X is 0.5 to 2.

[0067] Furthermore, the length ratio of the flat part 211B of the light incident surface of the second light emitting unit lens to the inclined part 212B of the light incident surface of the second light emitting unit lens in the length direction X of the lens is greater than 0 and less than or equal to 2. It can be understood that the proportion of the flat part 211B of the light incident surface of the second light emitting unit lens can approach 0.

[0068] As Figure 6 and Figure 7 shown, the lens 20A of the first light emitting unit and the lens 20B of the second light emitting unit are symmetric with respect to the midline in the length direction X of the lighting device, so that the light incident surface 21A of the first light emitting unit lens and the light incident surface 21B of the second light emitting unit lens are symmetric with respect to the midline in the length direction X of the lighting device. Here, the midline in the length direction X of the lighting device refers to the line that extends along the width direction Y of the lighting device and passes through the center in the length direction X of the lighting device.

[0069] The inclined part 212A of the light incident surface of the first light emitting unit lens and the inclined part 212B of the light incident surface of the second light emitting unit lens are closer to the lens light emitting surface 22 as they extend towards the midpoint in the length direction X of the lighting device.

[0070] Using lenses with left - right symmetry settings, a single light - emitting unit (the first light - emitting unit A or the second light - emitting unit B) can have a gradually changing X - ray illumination brightness (showing a specific distribution) along the length direction X. When two separate light - emitting units are combined, the regions with lower brightness of the two light - emitting units are arranged opposite to each other (close to each other), and the regions with higher brightness of the two light - emitting units are arranged in the opposite way (far from each other). That is to say, the middle position in the length direction X of the lighting device is the region with lower brightness of the first light - emitting unit A and the second light - emitting unit B, and the two end positions in the length direction X of the lighting device are the regions with higher brightness of the first light - emitting unit A and the second light - emitting unit B. In this way, the brightness of the two regions with lower brightness is superimposed, so that the illumination uniformity of the lighting device in the length direction X is better.

[0071] In the length direction X of the lighting device, the illumination uniformity of the middle position and the two end regions of the lighting device is better. For example, according to the test method of GB / T9473 to measure the illumination uniformity, the brightness difference between the brightest region and the darkest region in the test area is small, which can be less than or equal to 1.2.

[0072] This application is not limited to the above - mentioned embodiments. Those skilled in the art can make various modifications to the above - mentioned embodiments of this application under the teaching of this application without departing from the scope of this application. In addition, the following explanations are also made.

[0073] (1) In the above - mentioned embodiment, a group of lenses is arranged along the width direction Y of the lighting device, but this application is not limited to this. Multiple groups of lenses can also be arranged along the width direction of the lighting device.

[0074] (2) In the above - mentioned embodiment, two groups of straight parts 211A of the light - incident surface of the first - light - emitting - unit lens and two groups of inclined parts 212A of the light - incident surface of the first - light - emitting - unit lens are arranged along the width direction Y of the lens 20A of the first light - emitting unit, but this application is not limited to this. In other possible embodiments, one group or more groups (such as 3 groups) of straight parts of the light - incident surface of the first - light - emitting - unit lens and inclined parts of the light - incident surface of the first - light - emitting - unit lens can be arranged.

[0075] (3) In the above - mentioned embodiment, two groups of straight parts 211B of the light - incident surface of the second - light - emitting - unit lens and two groups of inclined parts 212B of the light - incident surface of the second - light - emitting - unit lens are arranged along the width direction Y of the lens 20B of the second light - emitting unit, but this application is not limited to this. In other possible embodiments, one group or more groups (such as 3 groups) of straight parts of the light - incident surface of the second - light - emitting - unit lens and inclined parts of the light - incident surface of the second - light - emitting - unit lens can be arranged.

[0076] (4) Refer to Figure 8, it can be understood that the light incident surface of the lens may have a planar portion 23 extending along the length direction X, and the light source may include some lamp beads facing the planar portion 23 directly, and the light emitted by these lamp beads can directly pass through the planar portion 23.

[0077] It should be understood that at least some aspects or features of the above embodiments, examples or illustrations can be appropriately combined.

[0078] It can be understood that in this application, when the number of components or members is not specifically limited, the number can be one or more, and here "more than one" means two or more. For the case where the number of components or members shown in the drawings and / or described in the specification is a specific number such as two, three, four, etc., this specific number is usually exemplary rather than restrictive, and it can be understood as more than one, that is, two or more. However, this does not mean that this application excludes the case of one.

[0079] In this application, unless otherwise clearly stated or limited, terms such as "install", "assemble", "connect", "link", "connect", "couple", "join", "abut", "communicate", "interconnect", "conduct", "fix", "fasten", etc. should be understood in a broad sense. For example, it can be direct or indirect. For example, regarding connection, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly stated or limited. For example, regarding communication / conductivity, etc., it can be direct communication / conductivity or indirect communication / conductivity via an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] In this application, unless otherwise clearly stated or limited, a component being disposed in / installed in / located in / accommodated in / placed within another component can be either of the following two situations: a part or most of the component is located within the other component; and the component is completely accommodated within the other component.

[0081] Although the above embodiments are used to describe this application in detail, for those skilled in the art, this application is obviously not limited to the embodiments described in this specification. This application can be modified and implemented as a variant embodiment without departing from the gist and scope of this application determined by the claims. Therefore, the descriptions in this specification are for illustrative purposes and do not have any restrictive meaning for this application.

Claims

1. A lens for a lighting device, characterized in that: The lens comprises: a lens light incident surface and a lens light exit surface, wherein the lens light incident surface is used to face the light source of the lighting device, In a longitudinal cross-section of the lens taken along the length direction of the lens, the light incident surface of the lens is serrated and includes a plurality of straight light incident surface portions and a plurality of inclined light incident surface portions, the straight light incident surface portions and the inclined light incident surface portions are alternately arranged along the length direction of the lens, the serrations of the lens are asymmetrical in shape, and the arrangement directions of the serrations are the same, the straight light incident surface portions are parallel to the length direction, and the inclined light incident surface portions are inclined relative to the length direction.

2. The lens for a lighting device according to claim 1, characterized in that: The straight portion of the light incident surface is a cylindrical surface, which protrudes toward the light source, and the axis of the cylindrical surface extends along the length direction of the lens. The inclined portion of the light incident surface is a conical surface, which protrudes toward the light source, and the axis of the conical surface extends along the length direction of the lens.

3. The lens for a lighting device according to claim 1, characterized in that: The straight portion of the light incident surface is connected to the top of the inclined portion of the light incident surface.

4. The lens for a lighting device according to claim 1, characterized in that: The ratio of the depth of the light incident surface inclined portion along the thickness direction of the lens to the length along the length direction is 0.5 to 2.

5. The lens for a lighting device according to claim 1, characterized in that: A length ratio of the straight portion of the light incident surface to the inclined portion of the light incident surface in the length direction of the lens is greater than 0 and less than or equal to 2.

6. The lens for a lighting device according to claim 1, characterized in that: The light emitting surface comprises a plurality of convex arc-shaped surfaces, the axes of the arc-shaped surfaces extend along the length direction of the lighting device, and the plurality of arc-shaped surfaces are arranged along the width direction of the lighting device.

7. A lighting device, characterized in that: The invention comprises a light source and the lens according to any one of claims 1 to 6, wherein the light emitting surface of the light source faces the light incident surface of the lens.

8. The lighting device according to claim 7, characterized in that: The lighting device comprises at least two lenses, and the at least two lenses are symmetrical with respect to a midline in a length direction of the lighting device.

9. The lighting device according to claim 7, characterized in that: The inclined portion of the light incident surface is closer to the light emitting surface as it extends toward the midline of the length direction of the lighting device.

10. The lighting device according to claim 7, characterized in that: The light source includes a plurality of lamp beads. In the width direction of the lighting device, at least some of the lamp beads are located in the middle of the straight portion of the light incident surface or the inclined portion of the light incident surface.

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