CN112303511A

CN112303511A - Lighting device

Info

Publication number: CN112303511A
Application number: CN202011198116.2A
Authority: CN
Inventors: 王国建
Original assignee: Qingdao Yilai Intelligent Technology Co Ltd
Current assignee: Qingdao Yilai Intelligent Technology Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-02-02
Also published as: WO2022089641A1

Abstract

The present invention provides a lighting device comprising: a Rayleigh scattering plate; the collimated light generator is arranged opposite to the Rayleigh scattering plate and used for providing collimated light beams; the light beam restraint device is arranged opposite to the collimated light generator, is positioned between the Rayleigh scattering plate and the collimated light generator and is provided with a light restraint channel and used for eliminating light rays at a preset angle; and the beam angle expander is arranged in the light restriction channel of the beam restrictor and used for deviating the collimated light beam emitted by the collimated light generator. Through the technical scheme provided by the invention, the technical problem that the lighting device in the prior art is poor in light emitting effect when simulating a sky light can be solved.

Description

Lighting device

Technical Field

The invention relates to the technical field of lighting devices, in particular to a lighting device.

Background

At present, with social progress and improvement of life quality, people pay more and more attention to life quality and pursue a healthy living environment. Under the circumstances, a new lamp form, namely a sky lamp or a blue sky lamp, begins to appear in the household lighting industry in recent years. The main characteristics of the simulated sky lamp are represented in the two aspects of simulating sky visual effect and simulating parallel irradiation of solar rays approximately. The existing simulated sky lamps in the market are mainly divided into two types: one is only focused on simulating sky visual effect, abandons the approximate simulation of sunlight parallel irradiation; the second type is the simulation of the sky vision effect and the approximate simulation of the parallel irradiation of the solar rays.

However, in the second case, in order to ensure the uniformity of the illumination intensity on the rayleigh scattering plate and ensure the simulation of the sky vision effect, the beam angle of the outgoing beam is required not to be too small; in order to ensure the approximate simulation of the parallel irradiation of the solar rays, the beam angle of the emergent beam needs to be as small as possible; the technical requirements are opposite to each other, and the conditions of local high space brightness and serious glare can also occur, so that the light emitting condition is poor, and the use experience of a user is not improved.

Disclosure of Invention

The invention mainly aims to provide a lighting device to solve the technical problem that the lighting device in the prior art is poor in light emitting effect when simulating a sky light.

In order to achieve the above object, the present invention provides a lighting device comprising: a Rayleigh scattering plate; the collimated light generator is arranged opposite to the Rayleigh scattering plate and used for providing collimated light beams; the light beam restraint device is arranged opposite to the collimated light generator, is positioned between the Rayleigh scattering plate and the collimated light generator and is provided with a light restraint channel and used for eliminating light rays at a preset angle; and the beam angle expander is arranged in the light restriction channel of the beam restrictor and used for deviating the collimated light beam emitted by the collimated light generator.

Further, the collimated light generator includes: a total reflection lens disposed opposite to the beam restrainer; and the light emitting part is arranged on the total reflection lens and is positioned on one side of the total reflection lens, which is far away from the light beam restraint device.

Further, the collimated light generator includes: eliminating the light cover; a light emitting section provided in the photomask; and a Fresnel lens disposed in the extinction cover, the Fresnel lens being disposed opposite to the light emitting portion.

Further, the collimated light generator includes: eliminating the light cover; a light emitting section provided in the photomask; and a single convex single lens arranged in the extinction cover, wherein the single convex single lens is opposite to the light emitting part.

Further, the collimated light generator includes: eliminating the light cover; a light emitting section provided in the photomask; and a biconvex single lens arranged in the light eliminating cover and opposite to the light emitting part.

Furthermore, the beam angle of the collimated light emitted by the collimated light generator is alpha, and the alpha is less than or equal to 20 degrees.

Furthermore, the number of the collimated light generators is multiple, and the multiple collimated light generators are arranged according to a rectangular array or a regular triangular array.

Further, the beam angle expander comprises a plurality of expansion units which are connected and arranged, each expansion unit is provided with a working surface which is arranged opposite to the collimated light generator, and each working surface is a spherical surface or a conical surface.

Furthermore, the number of the collimated light generators is multiple, the maximum distance between two adjacent collimated light generators is D, the radius of a lens of each collimated light generator is r, the distance between the emergent surface of the beam angle expander and the Rayleigh scattering plate is H, the deviation angle of the light rays after being disturbed by the beam angle expander is Delta theta,

further, the distance between the bottom of the collimated light generator and the top of the beam restrictor is W, the distance between two points farthest apart in the contour of the inner surface on the cross-section of the same beam restrictor is Φ, the shading angle of the beam restrictor is δ,

δ≥30°。

further, the beam restraint device is of a cylindrical structure, and the cross section of the beam restraint device is regular hexagon, square, rectangle or triangle.

By applying the technical scheme of the invention, the collimated light generator can provide the collimated light beam, wherein the collimated light beam can be a small-angle light beam close to parallel light. The small-angle light beam of the collimation light generator can be accurately and controllably expanded through the light beam angle expander, the light beam angle of the emergent light beam is limited while the light illumination uniformity target on the Rayleigh scattering plate is achieved, and meanwhile the light beam restraint device can also restrain direct vision glare of a sky lamp. The light beam restraint device can eliminate light rays in large-angle directions in the light rays from the autocollimation light generator, and is also responsible for providing a certain shading angle and used for inhibiting glare of the sky lamp. Therefore, the technical problem that the lighting device in the prior art is poor in light emitting effect when simulating a sky light can be solved through the technical scheme provided by the invention.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of a lighting device provided according to an embodiment of the present invention;

fig. 2 shows a schematic structural diagram of an extension unit provided according to an embodiment of the present invention;

FIG. 3 illustrates a schematic structural diagram of a collimated light generator having a total reflection lens and a light emitting part according to an embodiment of the present invention;

FIG. 4 illustrates a schematic configuration of a collimated light generator having a light emitting portion, a light eliminating cover, and a Fresnel lens provided according to an embodiment of the present invention;

FIG. 5 illustrates a schematic structural diagram of a collimated light generator having a light emitting portion, a light eliminating cover, and a single convex single lens according to an embodiment of the present invention;

FIG. 6 illustrates a schematic structural diagram of a collimated light generator having a light emitting portion, a light eliminating cover, and a biconvex single lens according to an embodiment of the present invention;

FIG. 7 illustrates an angle perturbation schematic diagram of a beam angle expander provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an expansion unit with an upwardly convex curved surface provided in accordance with an embodiment of the present invention;

FIG. 9 illustrates a front view of an expansion unit having an upwardly convex arc provided in accordance with an embodiment of the present invention;

fig. 10 is a schematic structural view illustrating an expansion unit having a downward convex surface according to an embodiment of the present invention;

FIG. 11 illustrates a front view of an expansion unit having a downward convex surface provided in accordance with an embodiment of the present invention;

FIG. 12 is a schematic structural diagram of an expansion unit with a tapered surface provided in accordance with an embodiment of the present invention;

FIG. 13 illustrates a front view of an expansion unit having a tapered surface provided in accordance with an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of total reflection lenses arranged in a rectangular array according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of total reflection lenses arranged in a triangular array according to an embodiment of the present invention;

FIG. 16 shows a schematic view of the relative position of a lighting device provided in accordance with another embodiment of the present invention;

FIG. 17 illustrates a schematic diagram of a light constrainer having a regular hexagonal cross-section, according to an embodiment of the present invention;

FIG. 18 illustrates a schematic structural diagram of a light constrainer having a square cross-section provided in accordance with an embodiment of the present invention;

FIG. 19 is a schematic diagram illustrating a layout of an arrangement between an expander and a light confiner provided in accordance with an embodiment of the present invention;

fig. 20 is a schematic diagram illustrating an arrangement layout between the expander and the light confining element according to another embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a Rayleigh scattering plate; 20. a collimated light generator; 21. a total reflection lens; 22. a light emitting section; 23. eliminating the light cover; 24. a Fresnel lens; 25. a single convex single lens; 26. a biconvex single lens; 30. a beam restrainer; 40. a beam angle expander; 41. and an extension unit.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1 to 20, an embodiment of the present invention provides an illumination apparatus including a rayleigh scattering plate 10, a collimated light generator 20, a beam restrictor 30, and a beam angle expander 40. The collimated light generator 20 is disposed opposite to the rayleigh scattering plate 10, and specifically, the collimated light generator 20 refers to a light generator for providing a collimated light beam. The light beam constrainer 30 is disposed opposite to the collimated light generator 20, the light beam constrainer 30 is disposed between the rayleigh scattering plate 10 and the collimated light generator 20, the light beam constrainer 30 has a light constraint channel, and the light beam constrainer 30 is configured to eliminate light rays at a preset angle, where the preset angle is not limited to a certain angle value, and the preset angle may also include a certain angle range, or the preset angle is an angle range larger than a specific angle value. The collimated light generated by the collimated light generator 20 (excluding the primary axis light) gradually approaches the primary axis in the direction of extension and then gradually departs after intersecting, and only the portion of the primary axis that the emitted light approaches is shown in fig. 3-6. Preferably, the intersection of the collimated light rays is located within the light confining channel of the beam restrictor 30. The beam angle expander 40 is disposed in the light restriction channel of the light beam restriction device 30, and the beam angle expander 40 is configured to deflect the collimated light beam emitted by the collimated light generator 20, where "deflection" refers to changing an original propagation direction of the collimated light beam, and preferably, to further increase an included angle between the collimated light beam and the main optical axis, the beam angle of the collimated light beam is increased, so that the beam angle of the light beam emitted by the beam angle expander 40 is greater than the beam angle of the collimated light beam emitted by the collimated light generator 20. Specifically, the lighting device in this embodiment includes a rayleigh scattering plate 10, a beam limiter 30, a beam angle expander 40, and a collimated light generator 20 in this order from top to bottom (top in the direction close to the user and bottom in the direction away from the user).

Specifically, the light confining channel of the beam restrictor 30 in this embodiment is substantially perpendicular to the plane of the beam angle expander 40. In the present embodiment, a plurality of collimated light generators 20 and a plurality of light beam constrainers 30 are included, the plurality of collimated light generators 20 are disposed in one-to-one correspondence with the plurality of light beam constrainers 30, and each light beam constrainer 30 is disposed at a position opposite to the corresponding collimated light generator 20. The illumination device in the present embodiment includes a plurality of illumination portions, each illumination portion includes a collimated light generator 20 and a light beam limiter 30 disposed opposite to the collimated light generator 20, a central axis of the collimated light generator 20 and a central axis of the light beam limiter 30 of each illumination portion are all located on the same straight line, preferably, the central axes of the collimated light generator 20 and the light beam limiter 30 are all coincident with the straight line where the main optical axis of each illumination portion is located, and the central axes of the collimated light generator 20 and the light beam limiter 30 are substantially perpendicular to the beam angle expander 40 and/or the rayleigh scattering plate 10, further, the beam angle expander 40 is substantially parallel to the rayleigh scattering plate 10 to embody a "direct illumination" structure in the present application.

With the illumination device provided by the present embodiment, the collimated light generator 20 can provide a collimated light beam, which may be a small-angle light beam close to parallel light. The small-angle light beam of the collimated light generator 20 can be accurately and controllably expanded by the beam angle expander 40, the beam angle of the emergent light beam is limited while the light illumination uniformity target on the rayleigh scattering plate 10 is realized, and meanwhile the direct-view glare of the sky light can be inhibited by the beam angle expander 40. The beam limiter 30 can eliminate the light from the collimated light generator 20 in the large angle direction, and also provides a certain shading angle for suppressing the glare of the sky light. The lighting device has the advantages of simple structure, good universality and small influence of the shape and the size of the lamp. Under the condition of realizing the approximate simulation of sky visual effect and solar ray parallel incidence, the glare suppression of indoor lamps is also considered. Therefore, the technical problem that the lighting device in the prior art is poor in light emitting effect when simulating a sky light can be solved through the technical scheme provided by the invention.

It should be noted that the disposition of the beam angle expander 40 within the light confining channel herein includes the disposition of the beam angle expander 40 entirely within the light confining channel or the disposition of the beam angle expander 40 at the top of the light confining channel.

In one embodiment, the collimated light generator 20 includes a total reflection lens 21 and a light emitting part 22, the total reflection lens 21 is disposed opposite to the beam limiter 30, the light emitting part 22 is disposed on the total reflection lens 21, specifically, the light emitting part 22 is disposed at the bottom of the total reflection lens 21, the light emitting part 22 is disposed at a side of the total reflection lens 21 away from the beam limiter 30, and the total reflection lens 21 is used for generating a collimated light beam. The total reflection lens 21 collimates all the light rays from the LED light source, and in order to properly reduce the light energy loss of the light beam emitted from the total reflection lens 21 in the light beam restraint 30 and thereby improve the optical efficiency, the outgoing light rays of the outgoing light beam from the total reflection lens 21 except the light beam with the main axis parallel to the main axis are intersected with the main axis, and in order to ensure that the collimation degree of the outgoing light rays and the included angle between the light rays and the main axis are less than 10 °. In this embodiment, the total reflection lens 21 collimates all the outgoing light rays, and the optical efficiency is the highest, which is the best model.

In another embodiment, the collimated light generator 20 includes a light-eliminating shade 23, a light-emitting portion 22, and a Fresnel lens 24, the light-emitting portion 22 is disposed within the light-eliminating shade 23, the Fresnel lens 24 is disposed within the light-eliminating shade 23, and the Fresnel lens 24 is disposed opposite to the light-emitting portion 22. The fresnel lens 24 collimates the central light from the LED light source, and the remaining light reaches the extinction cover 23 and is absorbed by the extinction cover 23. The matte cover 23 is treated with a black matte surface. In order to properly reduce the light energy loss of the light beam emitted from the fresnel lens 24 in the light beam restraint 30 and thereby improve the optical efficiency, the light beams emitted from the fresnel lens 24 except the light beam with the main axis parallel to the main axis are intersected with the main axis, and in order to ensure the collimation of the light beams and the included angle between the light beams and the main axis to be less than 10 °.

In another embodiment, the collimated light generator 20 includes a reticle 23, a light emitting portion 22, and a single convex einzel lens 25. The light emitting unit 22 is disposed in the light extinction cover 23, the single convex single lens 25 is disposed in the light extinction cover 23, and the single convex single lens 25 is disposed opposite to the light emitting unit 22. The single convex single lens 25 collimates the central portion light from the LED light source, and the remaining light reaches the extinction cover 23 and is absorbed by the extinction cover 23. The matte cover 23 is treated with a black matte surface. In order to properly reduce the light energy loss of the emergent light beam of the single convex single lens 25 in the light beam restraint device 30 and improve the optical efficiency, other emergent light beams of the emergent light beam of the single convex single lens 25 except that the main axis light beam is parallel to the main optical axis are intersected with the main optical axis, and in order to ensure that the collimation degree of the emergent light beams and the included angle between the light beams and the main optical axis are less than 10 degrees.

In another embodiment, the collimated light generator 20 includes a light-eliminating shade 23, a light-emitting portion 22, and a biconvex single lens 26, the light-emitting portion 22 is disposed in the light-eliminating shade 23, the biconvex single lens 26 is disposed in the light-eliminating shade 23, and the biconvex single lens 26 is disposed opposite to the light-emitting portion 22. The biconvex single lens 26 collimates the central light from the LED light source, and the remaining light reaches the extinction cover 23 and is absorbed by the extinction cover 23. The matte cover 23 is treated with a black matte surface. In order to properly reduce the light energy loss of the emergent light beam of the biconvex single lens 26 in the light beam restraint 30 and improve the optical efficiency, other emergent light beams of the emergent light beam of the biconvex single lens 26 except that the main axis light beam is parallel to the main optical axis are intersected with the main optical axis, and in order to ensure that the collimation degree of the emergent light beams and the included angle between the light beams and the main optical axis are less than 10 degrees.

Specifically, the beam angle of the collimated light emitted by the collimated light generator 20 in all the embodiments is α, α is not more than 20 °, the beam angle is used to represent an effective illumination angle, and an included angle between the emitted light and the main optical axis and the beam angle are in a direct proportion relationship. Specifically, the optimal light beam angle α interval of the outgoing light beam of the collimated light generator 20 is 6 to 8 °, and the suboptimal light beam angle interval is 6 to 10 ° and 11 to 15 °.

Specifically, the number of the collimated light generators 20 in this embodiment is multiple, and the multiple collimated light generators 20 are arranged in a rectangular array or a regular triangular array to achieve different light emitting effects. Accordingly, the beam constrainers 30 in the present embodiment are arranged in the same array, and the beam angle spreaders 40 in the present embodiment are also arranged in the same array.

In all of the above embodiments, after the lighting device is mounted, the beam angle expander 40 is disposed at the top of the collimated light generator 20, and at the same time, the beam angle expander 40 is disposed between the top of the beam restrainer 30 and the bottom of the beam restrainer 30. It should be noted that, in the embodiment, the collimated light generator 20 is disposed at the bottom of the light beam limiter 30, the end of the collimated light generator 20 close to the light beam limiter 30 is the top of the collimated light generator 20, and the end of the collimated light generator 20 far away from the light beam limiter 30 is the bottom of the collimated light generator 20. An end of the light beam restrictor 30 near the collimated light generator 20 is a bottom of the light beam restrictor 30, and an end of the light beam restrictor 30 away from the collimated light generator 20 is a top of the light beam restrictor 30. The position of the beam angle expander 40 above the top of the beam restrainer 30 indicates that the beam angle expander 40 is disposed within the passageway of the beam restrainer 30.

Specifically, the beam angle expander 40 includes a plurality of expanding units 41 connected to each other, and the expanding units 41 are specific microstructures having shape dimensions associated with the relative positions of the respective collimated light generators 20, the mounting positions of the beam angle precise expanders, the mounting positions of the rayleigh scattering plates 10, and the like. Specifically, the principle that the microstructure can precisely control the angular disturbance amount is precisely controlled is described as follows: as shown in fig. 7, N1N2 is the normal on the working surface of the microstructure, IP is the incident light, and PO is the outgoing light. The outgoing and incoming rays obey snell's law with respect to the normal: sin (less OPN1) ═ Rf × sin (less IPN2), and Rf is the refractive index of the lens material to light. After the curvature of the working arc surface of the microstructure is determined, the normal direction of each point on the working arc surface is also determined, and the disturbance quantity or the deviation angle delta theta of the emergent ray relative to the incident ray is determined as ^ OPN 1-IPN 2. Therefore, when the curvature of the working arc surface of the microstructure is determined, the disturbance amount to the incident light or the emergent light of the autocollimation light generator 20 is determined. The disturbance amount is preferably increased by 0 to 15 degrees, preferably by 5 to 10 degrees, of the beam angle of the output light of the collimated light generator 20.

In the above embodiment, the expansion unit 41 has a working surface, which is a spherical surface or a conical surface, disposed opposite to the collimated light generator 20. Specifically, the contour line of the working surface of the expansion unit 41 may be selected from a convex arc, a straight broken line, and the like, wherein the convex arc is a preferred form.

Specifically, the number of the collimated light generators 20 in this embodiment is plural, the maximum distance between two adjacent collimated light generators 20 is D, the radius of the lens of the collimated light generator 20 is r, the distance between the exit surface of the beam angle expander 40 and the rayleigh scattering plate 10 is H, the deviation angle of the light disturbed by the beam angle expander 40 is Δ θ,

by adopting the structure, the emergent light rays of two adjacent collimated light generators 20 can be overlapped on the Rayleigh scattering plate 10, so that the integral illumination uniformity of the Rayleigh scattering plate 10 is improved.

All the surfaces of the beam constrainer 30 in all the above embodiments are black matte, and absorb the large-angle light rays in the light beams from the collimated light generator 20, so as to realize the beam angle of the emergent light, and thus suppress the glare. As shown, there is a gap G between the top of the collimated light generator 20 and the bottom of the beam limiter 30, G being a positive value, in view of the convenience of production and the verification of practical effects.

Further, the distance between the bottom of the collimated light generator 20 and the top of the beam restrictor 30 is W (as can be seen in particular in FIGS. 19 and 20), the distance between two points farthest apart in the inner surface profile on the cross-section of the same beam restrictor 30 is Φ, the cut-off angle of the beam restrictor 30 is δ,

"atan ()" represents a tangent function. Typically delta.gtoreq.30 deg., preferably delta.gtoreq.45 deg.. With such a structural arrangement, the light source can be suppressedThe glare is directly observed, and the use comfort is improved.

Specifically, the beam restraints 30 in all the above embodiments may be cylindrical structures, and the cross section of the beam restraints 30 may be regular hexagon, square, rectangle, triangle, or the like.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: simple structure, good generalization and small influence by the shape and the size of the lamp. Under the condition of realizing the approximate simulation of sky visual effect and solar ray parallel incidence, the glare suppression of indoor lamps is also considered.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An illumination device, comprising:

a Rayleigh scattering plate (10);

a collimated light generator (20) disposed opposite the Rayleigh scattering plate (10), the collimated light generator (20) configured to provide a collimated light beam;

a light beam constrainer (30) disposed opposite to the collimated light generator (20), the light beam constrainer (30) being disposed between the Rayleigh scattering plate (10) and the collimated light generator (20), the light beam constrainer (30) having a light constraining passage, the light beam constrainer (30) being configured to eliminate light rays of a preset angle;

a beam angle expander (40) disposed within the light confinement channel of the beam restrictor (30), the beam angle expander (40) for deflecting the collimated light beam emitted by the collimated light generator (20).

2. The lighting device of claim 1, wherein the collimated light generator (20) comprises:

a total reflection lens (21) disposed opposite to the beam restrictor (30);

the light emitting part (22) is arranged on the total reflection lens (21), and the light emitting part (22) is located on one side, far away from the light beam restraint device (30), of the total reflection lens (21).

3. The lighting device of claim 1, wherein the collimated light generator (20) comprises:

a light-eliminating mask (23);

a light emitting unit (22) provided in the extinction cover (23);

and a Fresnel lens (24) provided in the extinction cover (23), the Fresnel lens (24) being provided so as to face the light-emitting section (22).

4. The lighting device of claim 1, wherein the collimated light generator (20) comprises:

a light-eliminating mask (23);

a light emitting unit (22) provided in the extinction cover (23);

and a single convex single lens (25) disposed in the extinction cover (23), wherein the single convex single lens (25) is disposed opposite to the light emitting part (22).

5. The lighting device of claim 1, wherein the collimated light generator (20) comprises:

a light-eliminating mask (23);

a light emitting unit (22) provided in the extinction cover (23);

and a biconvex single lens (26) disposed in the light-eliminating cover (23), wherein the biconvex single lens (26) is disposed opposite to the light-emitting part (22).

6. A lighting device as claimed in claim 1, wherein the collimated light generator (20) emits collimated light at a beam angle α ≦ 20 °.

7. The lighting device according to any one of claims 1 to 6, wherein the number of the collimated light generators (20) is plural, and the plural collimated light generators (20) are arranged in a rectangular array or a regular triangular array.

8. The lighting device according to any one of claims 1 to 6, wherein the beam angle expander (40) comprises a plurality of connectively arranged expansion units (41), the expansion units (41) having a working surface arranged opposite the collimated light generator (20), the working surface being spherical or conical.

9. The lighting device according to any one of claims 1 to 6, wherein the collimated light generator (20) is plural, a maximum distance between two adjacent collimated light generators (20) is D, a radius of a lens of the collimated light generator (20) is r, and an exit of the beam angle expander (40) is rThe distance between the surface and the Rayleigh scattering plate (10) is H, the deviation angle of the light rays after being disturbed by the beam angle expander (40) is delta theta,

10. a lighting device as claimed in any one of claims 1 to 6, characterized in that the distance between the bottom of the collimated light generator (20) and the top of the beam restrictor (30) is W, the distance between two points farthest apart in the contour of the inner surface on the same cross-section of the beam restrictor (30) is Φ, the shading angle of the beam restrictor (30) is δ,

δ≥30°。

11. a lighting device as claimed in any one of claims 1 to 6, characterized in that said light beam restrainer (30) is a cylindrical structure, said light beam restrainer (30) having a cross-section in the shape of a regular hexagon, or a square, or a rectangle, or a triangle.