A lighting device

Abstract

The utility model provides a kind of lighting device, it is related to optical technology field.The utility model embodiment provides a kind of lighting device, including light source, first prism array and second prism array;First prism array includes at least one first repeat unit;In the same first repeat unit, the extension direction of the first prism of two first modulation subunits exists intersection;Second prism array includes at least one second repeat unit;In the same second repeat unit, the extension direction of the second prism of two second modulation subunits exists intersection;First prism array and second prism array are sequentially arranged on the optical path of illumination beam, and the facula of illumination beam by first prism array and second prism array is greater than the facula of illumination beam emitted from light source.The utility model embodiment provides a kind of lighting device, avoid high-brightness illumination light source to cause damage to human eye, while realizing the dispersion of the propagation direction of illumination beam without luminous flux loss.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to a lighting device. Background Technology

[0002] Looking directly at a light source can be glaring and damage eyesight. A common way to avoid glare is to use a frosted surface to diffuse the light beam, but this reduces the luminous flux of the light source and decreases the utilization rate of the light beam. Utility Model Content

[0003] This utility model provides a lighting device that can disperse the propagation direction of the lighting beam. Moreover, each repeating unit contains prisms with intersecting extension directions. This makes the propagation direction of the lighting beam modulated by the intersecting prisms different, which improves the ability of the prism array to disperse the lighting beam. This avoids the human eye from looking directly at the lighting source when observing the lighting device, and avoids damage to the human eye caused by the high brightness of the lighting source. At the same time, it achieves dispersion of the propagation direction of the lighting beam without loss of luminous flux.

[0004] This utility model provides a lighting device, including a light source, a first prism array, and a second prism array;

[0005] The light source is used to emit an illumination beam, which is a parallel beam.

[0006] The first prism array includes at least one first repeating unit, the first repeating unit includes at least two first modulation sub-units, and the first modulation sub-unit includes at least one first prism; in the same first repeating unit, the extension directions of the first prisms of two first modulation sub-units intersect.

[0007] The second prism array includes at least one second repeating unit, the second repeating unit includes at least two second modulation sub-units, and the second modulation sub-unit includes at least one second prism; in the same second repeating unit, there are two second modulation sub-units whose extension directions intersect.

[0008] The first prism array and the second prism array are sequentially arranged in the optical path of the illumination beam, and the light spot of the illumination beam passing through the first prism array and the second prism array is larger than the light spot of the illumination beam emitted from the light source.

[0009] Optionally, the first modulation subunit includes at least two first prisms, and the at least two first prisms located in the same first modulation subunit are parallel to each other;

[0010] The second modulation subunit includes at least two second prisms, and the at least two second prisms located in the same second modulation subunit are parallel to each other.

[0011] Optionally, the first prism includes a first wedge-shaped tip and a first tail end, the first wedge-shaped tip being located on the side of the first tail end closer to the light source, and the illumination beam entering the first prism from the first wedge-shaped tip;

[0012] The second prism includes a second wedge tip and a second tail end. The second wedge tip is located on the side of the second tail end closer to the light source, and the illumination beam enters the second prism from the second wedge tip.

[0013] Optionally, the first wedge tip includes a first included angle, wherein the first included angle α1 satisfies 0° < α1 < 180°;

[0014] The second wedge tip includes a second included angle, α2, which satisfies 0° < α2 < 180°.

[0015] Optionally, the first prism array and the second prism array are arranged in parallel.

[0016] Optionally, the first prism array and the second prism array have the same shape;

[0017] In the corresponding first modulation subunit and second modulation subunit, the included angle α3 between the extension directions of the first prism and the second prism satisfies 0°≤α3≤60°.

[0018] Optionally, the first modulation subunit includes a triangular modulation subunit, and the first repeating unit includes six first modulation subunits; the six first modulation subunits in the same first repeating unit are arranged with a common vertex, and the angle between the extension directions of the first prisms in two first modulation subunits arranged adjacent to each other in the circumferential direction is 120°.

[0019] The second modulation subunit includes a triangular modulation subunit, and the second repeating unit includes six second modulation subunits; the six second modulation subunits in the same second repeating unit are arranged with a common vertex, and the angle between the extension directions of the second prisms in two adjacent second modulation subunits arranged in the circumferential direction is 120°.

[0020] Optionally, the first modulation subunit includes a rectangular modulation subunit, and the first repeating unit includes four first modulation subunits; the four first modulation subunits in the same first repeating unit are set with a common vertex, and the extension directions of the first prisms in two adjacent first modulation subunits are perpendicular to each other;

[0021] The second modulation subunit includes a rectangular modulation subunit, and the second repeating unit includes four second modulation subunits; the four second modulation subunits in the same second repeating unit are set with a common vertex, and the extension directions of the second prisms in two adjacent second modulation subunits are perpendicular to each other.

[0022] Optionally, the light source includes a light-emitting element and a parallel modulation element;

[0023] The light-emitting element is used to emit the initial illumination beam;

[0024] The parallel modulation element is located in the optical path between the light-emitting element and the first prism array, and is used to modulate the initial illumination beam into a parallel beam.

[0025] Optionally, the parallel modulation element includes a Fresnel lens.

[0026] The lighting device provided in this embodiment includes two prism arrays. The first prism array and the second prism array can modulate the propagation direction of the lighting beam, thereby dispersing the propagation direction of the lighting beam. Moreover, each repeating unit contains prisms with intersecting extension directions, which makes the propagation direction of the lighting beam modulated by the intersecting prisms different. This improves the ability of the prism array to disperse the lighting beam, prevents the human eye from looking directly at the lighting source when observing the lighting device, avoids damage to the human eye caused by high-brightness lighting sources, and achieves dispersion of the propagation direction of the lighting beam without loss of luminous flux.

[0027] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a lighting device provided in an embodiment of this utility model;

[0030] Figure 2 This is a top view of the first prism array provided in this embodiment of the present invention;

[0031] Figure 3 This is a top view of the second prism array provided in this embodiment of the present invention;

[0032] Figure 4 This is a top view of another first prism array provided in this embodiment of the present utility model;

[0033] Figure 5 This is a top view of another second prism array provided in this embodiment of the present invention;

[0034] Figure 6This is a top view of yet another first prism array provided in this embodiment of the utility model;

[0035] Figure 7 This is a top view of yet another second prism array provided in this embodiment of the utility model;

[0036] Figure 8 This is a side view of the first modulation subunit provided in this embodiment of the present invention;

[0037] Figure 9 This is a side view of the second modulation subunit provided in this embodiment of the present invention;

[0038] Figure 10 This is another lighting device provided in the embodiments of the present invention;

[0039] Figure 11 This is a structural diagram of a first prism and a second prism provided in an embodiment of the present invention;

[0040] Figure 12 This is a structural diagram of another first prism and second prism provided in an embodiment of the present invention.

[0041] Figure 13 This is a structural diagram of another first prism array provided in this embodiment of the utility model;

[0042] Figure 14 This is a structural diagram of yet another second prism array provided in this utility model embodiment;

[0043] Figure 15 This is a schematic diagram of the optical path of the lighting device provided in an embodiment of the present invention;

[0044] Figure 16 This is a schematic diagram of the structure of the first repeating unit and the second repeating unit provided in the embodiment of this utility model;

[0045] Figure 17 This is a schematic diagram of another first repeating unit and a second repeating unit provided in an embodiment of the present invention;

[0046] Figure 18 This is a schematic diagram of the structure of another lighting device provided in this embodiment of the utility model. Detailed Implementation

[0047] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0048] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0049] This utility model embodiment provides a lighting device. Figure 1 This is a schematic diagram of the structure of a lighting device provided in an embodiment of the present invention. Figure 2 This is a top view of the first prism array provided in this embodiment of the present invention. Figure 3 This is a top view of the second prism array provided in an embodiment of the present invention, with reference to... Figure 1 , Figure 2 and Figure 3The lighting device includes a light source 300, a first prism array 100, and a second prism array 200. The light source 300 emits an illumination beam, which is a parallel beam. The first prism array 100 includes at least one first repeating unit 101, which includes at least two first modulation sub-units 102, and each first modulation sub-unit 102 includes at least one first prism 103. Within the same first repeating unit 101, the extending directions of the first prisms 103 of the two first modulation sub-units 102 intersect. The second prism array 200 includes... At least one second repeating unit 201, the second repeating unit 201 includes at least two second modulation sub-units 202, the second modulation sub-unit 202 includes at least one second prism 203; in the same second repeating unit 201, there are two second modulation sub-units 202 whose extending directions intersect; the first prism array 100 and the second prism array 200 are sequentially arranged in the optical path of the illumination beam, and the light spot of the illumination beam passing through the first prism array 100 and the second prism array 200 is larger than the light spot of the illumination beam emitted from the light source.

[0050] refer to Figure 1 , Figure 2 and Figure 3The first prism array 100 includes one or more first repeating units 101, and the shapes of each first repeating unit 101 may be the same or different. The second prism array 200 includes one or more second repeating units 201, and the shapes of each second repeating unit 201 may be the same or different. The first repeating unit 101 may include two or more first modulation subunits 102, and the shapes of each first modulation subunit 102 may be the same or different. The second repeating unit 201 may include two or more second modulation subunits 202, and the shapes of each second modulation subunit 202 may be the same or different. The first modulation subunit 102 may include one or more first prisms 103, and the second modulation subunit 202 may include one or more second prisms 203. After the illumination beam emitted by the light source 300 passes through the first prism array 100 and then the second prism array 200, the parallel illumination beams, due to refraction, are modulated by the first prism 103. The illumination beams incident at different positions on the first prism 103 will propagate in different directions after exiting the first prism array 100. Thus, the first prism array 100 can disperse the illumination beam into beams in different directions. Similarly, the second prism array 200 can further disperse the illumination beam exiting the first prism array 100, making the light spots of the illumination beams passing through the first prism array 100 and the second prism array 200 larger than the light spot of the illumination beam emitted from the light source. This also prevents the human eye from looking directly at the illumination source when observing the lighting device, avoiding damage to the eyes from high-brightness illumination.

[0051] Each first repeating unit 101 contains first prisms 103 with intersecting extension directions, and the surfaces of these intersecting prisms 103 are not parallel to each other. This causes the propagation directions of the illumination beams modulated by the intersecting prisms 103 to differ, thus dispersing the propagation direction of the illumination beams passing through the first prism array 100 into more directions, further dispersing the illumination beams emitted from the first prism array 100. Similarly, the second prism array also contains second prisms 203 with intersecting extension directions, achieving the same effect. Furthermore, the luminous flux of the illumination beam remains unchanged after passing through the first prism array 100 and the second prism array 200, achieving dispersion of the illumination beam's propagation direction without luminous flux loss.

[0052] The lighting device provided in this embodiment includes two prism arrays. The first prism array and the second prism array can modulate the propagation direction of the lighting beam, thereby dispersing the propagation direction of the lighting beam. Moreover, each repeating unit contains prisms with intersecting extension directions, which makes the propagation direction of the lighting beam modulated by the intersecting prisms different. This improves the ability of the prism array to disperse the lighting beam, prevents the human eye from looking directly at the lighting source when observing the lighting device, avoids damage to the human eye caused by high-brightness lighting sources, and achieves dispersion of the propagation direction of the lighting beam without loss of luminous flux.

[0053] Figure 4 This is a top view of another first prism array provided in this embodiment of the present invention. Figure 5 This is a top view of another second prism array provided in this embodiment of the present invention. Figure 6 This is a top view of yet another first prism array provided in this embodiment of the present invention. Figure 7 This is a top view of another second prism array provided in this embodiment of the present invention. Figure 8 This is a side view of the first modulation subunit provided in an embodiment of the present invention. Figure 9 This is a side view of the second modulation subunit provided in an embodiment of the present invention, with reference to... Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The first modulation subunit 102 includes at least two first prisms 103, and the at least two first prisms 103 located in the same first modulation subunit 102 are parallel to each other; the second modulation subunit 202 includes at least two second prisms 203, and the at least two second prisms 203 located in the same second modulation subunit 202 are parallel to each other.

[0054] refer to Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The number and size of the first prisms 103 in the first modulation subunit 102 can be set according to actual needs, and the number and size of the second prisms 203 in the second modulation subunit 202 can also be set according to actual needs. However, in order to ensure the dispersion effect of the first prism array 100 and the second prism array 200 on the illumination beam, it is generally necessary to ensure that all the illumination beam incident on the first modulation subunit 102 is incident on the first prisms 103. Figure 4 and Figure 5As shown, the multiple first prisms 103 should typically fill the light-receiving surface of the first modulation subunit 102, and the illumination beam incident on the second modulation subunit 202 should all be incident on the second prisms 203, meaning the multiple second prisms 203 should typically fill the light-receiving surface of the second modulation subunit 202. By arranging the first prisms 103 and the second prisms 203 in parallel, the first prisms 103 and the second prisms 203 can be closely arranged, thereby allowing the multiple first prisms 103 to fill the light-receiving surface of the first modulation subunit 102, and the multiple second prisms 203 to fill the light-receiving surface of the second modulation subunit 202.

[0055] Figure 10 This is another lighting device provided in the embodiments of the present invention, see reference. Figure 8 , Figure 9 and Figure 10 The first prism 103 includes a first wedge tip 104 and a first tail end 105. The first wedge tip 104 is located on the side of the first tail end 105 closer to the light source 300, and the illumination beam is incident on the first prism 103 from the first wedge tip 104. The second prism 203 includes a second wedge tip 204 and a second tail end 205. The second wedge tip 204 is located on the side of the second tail end 205 closer to the light source, and the illumination beam is incident on the second prism 203 from the second wedge tip 204.

[0056] refer to Figure 8 , Figure 9 and Figure 10 By directing the illumination beam from the first wedge tip 104 and the second wedge tip 204, the vertical incidence of the illumination beam on the first prism 103 and the second prism 203 can be avoided, thereby reducing the illumination beam reflected by the first prism 103 and the second prism 203 and improving the transmittance of the illumination beam.

[0057] Figure 11 This is a structural diagram of a first prism and a second prism provided in an embodiment of the present invention. Figure 12 This is a structural diagram of another first prism and second prism provided in an embodiment of the present invention, for reference. Figure 8 , Figure 9 , Figure 11 and Figure 12The first wedge tip 104 includes a first included angle α1, which satisfies 0° < α1 < 180°; the second wedge tip 204 includes a second included angle α2, which satisfies 0° < α2 < 180°. The first included angle α1 and the second included angle α2 can be set according to actual needs. The closer the first included angle α1 and the second included angle α2 are to 0°, the longer the length of the first prism 103 and the second prism 203 in the direction of illumination beam propagation, and the larger the volume of the first wedge tip 104 and the second wedge tip 204. The closer the first included angle α1 and the second included angle α2 are to 180°, the weaker the ability of the first prism 103 and the second prism 203 to deflect the illumination beam. When 30° < α1 < 60° and 30° < α2 < 60°, the first prism 103 and the second prism 203 are easier to manufacture while having a stronger ability to deflect the illumination beam. Figure 11 and Figure 12 The unit of length in this text is mm. Figure 11 The first included angle α1 or the second included angle α2 is 60°. Figure 12 The first included angle α1 or the second included angle α2 is 45°.

[0058] refer to Figure 10 The plane containing the first prism array 100 is parallel to the plane containing the second prism array 200. The first prism array 100 and the second prism array 200 are sheet-like structures. Their parallel arrangement ensures that the vector sum of the propagation directions of the illumination beams passing through the first prism array 100 and the second prism array 200 is the same as the propagation direction of the illumination beam emitted by the light source 300, thus preventing a shift in the overall propagation direction of the illumination beams passing through the first prism array 100 and the second prism array 200.

[0059] Figure 13 This is a structural diagram of another first prism array provided in this embodiment of the present invention. Figure 14 This is a structural diagram of another second prism array provided in this utility model embodiment, with reference to... Figure 13 and Figure 14 The first prism array 100 and the second prism array 200 have the same shape; in the correspondingly set first modulation subunit 102 and second modulation subunit 202, the included angle α3 between the extension directions of the first prism 103 and the second prism 203 satisfies 0°≤α3≤60°.

[0060] Figure 15 This is a schematic diagram of the optical path of the lighting device provided in an embodiment of the present invention, for reference. Figure 13 , Figure 14 and Figure 15Since the first prism array 100 and the second prism array 200 have the same shape, there is a correspondence between the first repeating unit 101 in the first prism array 100 and the second repeating unit 201 in the second prism array 200, and there is also a correspondence between the first modulation subunit 102 and the second modulation subunit 202. When α3 = 0°, in the projections of the first prism array 100 and the second prism array 200 onto the plane where the first prism array 100 is located, the projections of the corresponding first repeating unit 101 and the second repeating unit 201 completely overlap, and the projections of the corresponding first modulation subunit 102 and the second modulation subunit 202 completely overlap. Figure 13 and Figure 14 The blue boxes represent a set of corresponding first repeating units 101 and second repeating units 201, and the black boxes represent a set of corresponding first modulation subunits 102 and second modulation subunits 202. Figure 12 The second prism array 200 in Figure 11 The first prism array 100 in the illumination device has a completely identical shape, and the first prism array 100 and the second prism array 200 are arranged in parallel. Figure 12 The second prism array 200 in the middle is relative to Figure 11 The first prism array 100 in the first modulation subunit 102 is rotated by an included angle α3, so that the extending directions of the first prism 103 in the first modulation subunit 102 and the second prism 203 in the second modulation subunit 202 form an included angle α3. Making the extending directions of the corresponding first prism 103 and second prism 203 form a certain angle can make the propagation direction of the illumination beam output by the illumination device more dispersed, thereby avoiding glare from the light source. Figure 15 In order to demonstrate the optical path of the illumination beam in the second prism array 200, the second prism array 200 was elongated. The actual size of the second prism array 200 is the same as that of the first prism array 100. Figure 15 An optical path diagram of a set of parallel first prisms 103 and parallel second prisms 203 is shown. It can be seen that the illumination beam is divided into two different propagation directions. The first prism array 100 also includes first prisms 103 extending in other directions, and the second prism array 200 also includes second prisms 203 extending in other directions. Thus, the first prism array 100 and the second prism array 200 can modulate the propagation direction of the illumination beam into multiple different directions.

[0061] Figure 16 This is a schematic diagram of the structure of the first repeating unit and the second repeating unit provided in the embodiment of this utility model, with reference to... Figure 16The first modulation subunit 102 includes a triangular modulation subunit, and the first repeating unit 101 includes six first modulation subunits 102; the six first modulation subunits 102 in the same first repeating unit 101 are arranged with a common vertex, and the angle between the extension directions of the first prism 103 in two adjacent first modulation subunits 102 arranged in the circumferential direction is 120°; the second modulation subunit 202 includes a triangular modulation subunit, and the second repeating unit 201 includes six second modulation subunits 202; the six second modulation subunits 202 in the same second repeating unit 201 are arranged with a common vertex, and the angle between the extension directions of the second prism 203 in two adjacent second modulation subunits 202 arranged in the circumferential direction is 120°.

[0062] refer to Figure 16 The first repeating unit 101 and the second repeating unit 201 are regular hexagons, and the first modulation subunit 102 and the second modulation subunit 202 are triangular. Six first modulation subunits 102 share a common vertex with the center of the regular hexagon as their vertex, and six second modulation subunits 202 share a common vertex with the center of the regular hexagon as their vertex. Multiple hexagonal first repeating units 101 can be seamlessly spliced ​​to form a first prism array 100, and multiple hexagonal second repeating units 201 can be seamlessly spliced ​​to form a second prism array 200, thus improving the ability of the prism array to disperse the illumination beam.

[0063] Figure 17 This is a schematic diagram of another first repeating unit and a second repeating unit provided in an embodiment of this utility model, for reference. Figure 17 The first modulation subunit 102 includes a rectangular modulation subunit, and the first repeating unit 101 includes four first modulation subunits 102; the four first modulation subunits 102 in the same first repeating unit 101 are set with a common vertex, and the extension directions of the first prisms 103 in two adjacent first modulation subunits 102 are perpendicular to each other; the second modulation subunit 202 includes a rectangular modulation subunit, and the second repeating unit 201 includes four second modulation subunits 202; the four second modulation subunits 202 in the same second repeating unit 201 are set with a common vertex, and the extension directions of the second prisms 203 in two adjacent second modulation subunits 202 are perpendicular to each other.

[0064] refer to Figure 17The first repeating unit 101 and the second repeating unit 201 are rectangular, as are the first modulation subunit 102 and the second modulation subunit 202. Four first modulation subunits 102 share a common vertex with the center of the rectangle as their vertex. Similarly, four second modulation subunits 202 share a common vertex with the center of the rectangle as their vertex. Multiple rectangular first repeating units 101 can be seamlessly joined to form a first prism array 100, and multiple rectangular second repeating units 201 can be seamlessly joined to form a second prism array 200, thus improving the ability of the prism array to disperse the illumination beam.

[0065] Figure 18 This is a schematic diagram of the structure of another lighting device provided in an embodiment of this utility model, for reference. Figure 18 The light source 300 includes a light-emitting element 301 and a parallel modulation element 302. The light-emitting element 301 emits an initial illumination beam. The parallel modulation element 302 is located in the optical path between the light-emitting element 301 and the first prism array 100, and is used to modulate the initial illumination beam into a parallel beam. The light-emitting element 301 is a point light source, and the initial illumination beam is a divergent beam. The parallel modulation element 302 can converge the initial illumination beam and modulate it into a parallel beam. A parallel beam does not diverge, allowing for better illumination.

[0066] Optionally, the parallel modulation element includes a Fresnel lens. Fresnel lenses have strong light-gathering capabilities and are thinner and have fewer aberrations than ordinary lenses.

[0067] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A lighting device, characterized in that, Includes a light source, a first prism array, and a second prism array; The light source is used to emit an illumination beam, and the illumination beam is a parallel beam; The first prism array includes at least one first repeating unit, the first repeating unit includes at least two first modulation sub-units, and the first modulation sub-unit includes at least one first prism; in the same first repeating unit, the extension directions of the first prisms of two first modulation sub-units intersect. The second prism array includes at least one second repeating unit, the second repeating unit includes at least two second modulation sub-units, and the second modulation sub-unit includes at least one second prism; within the same second repeating unit, the extending directions of the second prisms of two second modulation sub-units intersect. The first prism array and the second prism array are sequentially arranged in the optical path of the illumination beam, and the light spot of the illumination beam passing through the first prism array and the second prism array is larger than the light spot of the illumination beam emitted from the light source.

2. The lighting device according to claim 1, characterized in that, The first modulation subunit includes at least two first prisms, and the at least two first prisms located in the same first modulation subunit are parallel to each other; The second modulation subunit includes at least two second prisms, and the at least two second prisms located in the same second modulation subunit are parallel to each other.

3. The lighting device according to claim 1, characterized in that, The first prism includes a first wedge-shaped tip and a first tail end, the first wedge-shaped tip being located on the side of the first tail end closer to the light source, and the illumination beam entering the first prism from the first wedge-shaped tip; The second prism includes a second wedge-shaped tip and a second tail end, the second wedge-shaped tip being located on the side of the second tail end closer to the light source, and the illumination beam entering the second prism from the second wedge-shaped tip.

4. The lighting device according to claim 3, characterized in that, The first wedge tip includes a first included angle, wherein the first included angle α1 satisfies 0°<α1<180°; The second wedge tip includes a second included angle, α2, which satisfies 0° < α2 < 180°.

5. The lighting device according to claim 1, characterized in that, The first prism array and the second prism array are arranged in parallel.

6. The lighting device according to claim 5, characterized in that, The first prism array and the second prism array have the same shape; In the corresponding first modulation subunit and second modulation subunit, the included angle α3 between the extension directions of the first prism and the second prism satisfies 0°≤α3≤60°.

7. The lighting device according to claim 1, characterized in that, The first modulation subunit includes a triangular modulation subunit, and the first repeating unit includes six first modulation subunits; the six first modulation subunits in the same first repeating unit are arranged with a common vertex, and the angle between the extension directions of the first prism in two first modulation subunits arranged adjacent to each other in the circumferential direction is 120°. The second modulation subunit includes a triangular modulation subunit, and the second repeating unit includes six second modulation subunits; the six second modulation subunits in the same second repeating unit are arranged with a common vertex, and the included angle between the extension directions of the second prism in two second modulation subunits arranged adjacent to each other in the circumferential direction is 120°.

8. The lighting device according to claim 1, characterized in that, The first modulation subunit includes a rectangular modulation subunit, and the first repeating unit includes four first modulation subunits; the four first modulation subunits in the same first repeating unit are set with a common vertex, and the extension directions of the first prism in two adjacent first modulation subunits are perpendicular to each other; The second modulation subunit includes a rectangular modulation subunit, and the second repeating unit includes four second modulation subunits; the four second modulation subunits in the same second repeating unit are arranged with a common vertex, and the extension directions of the second prism in two adjacent second modulation subunits are perpendicular to each other.

9. The lighting device according to claim 1, characterized in that, The light source includes a light-emitting element and a parallel modulation element; The light-emitting element is used to emit an initial illumination beam; The parallel modulation element is located in the optical path between the light-emitting element and the first prism array, and is used to modulate the initial illumination beam into a parallel beam.

10. The lighting device according to claim 9, characterized in that, The parallel modulation element includes a Fresnel lens.

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