CN117803888A

CN117803888A - Optical system and lamp

Info

Publication number: CN117803888A
Application number: CN202410121979.1A
Authority: CN
Inventors: 王国建
Original assignee: Zhongshan Yilai Intelligent Technology Co ltd
Current assignee: Zhongshan Yilai Intelligent Technology Co ltd
Priority date: 2024-01-29
Filing date: 2024-01-29
Publication date: 2024-04-02

Abstract

The invention discloses an optical system and a lamp; relates to the technical field of optics. The optical system comprises a primary reflector and a secondary reflector, wherein the primary reflector is arranged in an offset manner compared with the secondary reflector, so that an included angle is formed between a light incident surface of the primary reflector and a reflecting surface of the secondary reflector, a first light beam which is asymmetrically distributed compared with a main optical axis of the first light beam is formed, the primary reflector comprises at least one optical reflecting cavity, the optical reflecting cavity is provided with two opposite side walls with different lengths, and the light incident surface and the light emergent surface which are formed on two opposite sides of the side walls, so that asymmetric light distribution is further realized. The optical reflection cavity further comprises two reflection surfaces with outline lines which are convex arc lines and are used for adjusting the divergence shape and the light intensity distribution of the first light beam; the secondary reflector comprises a first optical inclined plane, a second optical inclined plane and a third optical inclined plane which are different in angle and length, and the longitudinal divergence shape and the longitudinal light intensity distribution of the first light beam are adjusted to form a second light beam; and further realizing asymmetric light distribution.

Description

Optical system and lamp

Technical Field

The present disclosure relates to optical systems, and particularly to an optical system and a lamp.

Background

In the field of current reading and writing desk lamps, a symmetrical distribution optical system is a mainstream technical form of the market due to simple design and low cost.

However, the symmetrical optical system also has the technical disadvantages of high power consumption, light energy dispersion, low actual light utilization rate in the reading area, and the like, and the market uniformity is serious.

Disclosure of Invention

In order to solve the above-mentioned problems in the background art, in a first aspect, the present invention provides an optical system, including:

the primary reflector comprises at least one optical reflection cavity, the optical reflection cavity is provided with a side wall, a light inlet surface and a light outlet surface which are formed on two sides of the side wall and are opposite, incident light of the light emitting element enters the optical reflection cavity through the light inlet surface, and forms a first light beam after being reflected by the side wall of the optical reflection cavity and exits through the light outlet surface;

the second-stage reflector is arranged opposite to the first-stage reflector and positioned at one side of the light-emitting surface of the first-stage reflector, the second-stage reflector is provided with a reflecting surface, and the first light beam is reflected by the reflecting surface of the second-stage reflector to form a second light beam and emitted;

the primary reflector is arranged in an offset manner compared with the secondary reflector, so that an included angle alpha is formed between the light incident surface of the primary reflector and the reflecting surface of the secondary reflector, light which is incident from the midpoint of the light incident surface and is perpendicular to the light incident surface by the light emitting element is used as a first light beam main optical axis, light which is emitted after being reflected by the secondary reflector on the first light beam main optical axis is used as a second light beam main optical axis, and the second light beam which is emitted is asymmetrically distributed compared with the second light beam main optical axis due to the arrangement of the included angle alpha;

In some embodiments, the side walls of the primary reflector have oppositely disposed first and second side walls, the primary reflector being offset from the secondary reflector such that the first side wall is closer to the second reflector than the second side wall,

the first side wall is higher than the second side wall in height in the direction perpendicular to the light incident surface, so that the first light beam is asymmetrically distributed compared with the main optical axis of the first light beam;

and/or the included angle between the first side wall and the first light beam main optical axis is smaller than the included angle between the second side wall and the first light beam main optical axis, so that the first light beam is asymmetrically distributed compared with the first light beam main optical axis;

in some embodiments, the primary reflector is configured to constrain the divergent shape of the light incident by the illuminator and to adjust the intensity distribution of the light to form a first light beam asymmetrically distributed relative to the primary optical axis of the first light beam;

in some embodiments, the optically reflective cavity comprises: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged;

the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are sequentially connected, the cross section parallel to the light incident surface is formed through the optical reflecting cavity, and the section lines of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are straight line segments;

In the propagation direction of the incident light, at least one of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface is inclined outwards, so that the light emergent surface of the optical reflecting cavity is larger than the light incident surface;

in some embodiments, the primary reflector is offset from the secondary reflector such that the fourth reflective surface of the optically reflective cavity is closer to the secondary reflector than the first reflective surface, wherein,

the included angle between the fourth reflecting surface and the first light beam main optical axis is smaller than the included angle between the first reflecting surface and the first light beam main optical axis, and/or the height of the fourth reflecting surface is larger than the height of the first reflecting surface;

in some embodiments, the optical reflection cavity further includes a second reflection surface disposed between the first reflection surface and the third reflection surface, and a sixth reflection surface disposed between the first reflection surface and the fifth reflection surface, the second reflection surface and the sixth reflection surface being used for adjusting the divergent shape and the light intensity distribution of the first light beam;

the profile line of the second reflecting surface and the sixth reflecting surface is an outward convex arc line;

in some embodiments, the secondary reflector is configured to adjust the longitudinal divergence shape and longitudinal intensity distribution of the first beam of light to form a second beam of light;

The secondary reflector comprises a first optical inclined plane and a second optical inclined plane which are connected with each other, and the lengths and/or the inclination angles of the first optical inclined plane and the second optical inclined plane are different;

in some embodiments, the primary reflector is disposed opposite the secondary reflector, and the primary reflector is disposed at an end of the secondary reflector proximate the first optical chamfer;

the secondary reflector is configured such that the first optical bevel is configured to reflect a portion of the first light beam from the primary reflector to the proximal end and the second optical bevel is configured to reflect another portion of the first light beam to the distal end, wherein the proximal end is an end of the second light beam proximate the primary reflector and the distal end is an end of the second light beam distal the primary reflector.

In some embodiments, the optical system further comprises a light-emitting plate disposed downstream of the second light beam and disposed opposite the secondary reflector, the second light beam exiting through the light-emitting plate; wherein,

the second-stage reflector further comprises a third optical inclined plane, the third optical inclined plane is arranged at one end of the second optical inclined plane of the second-stage reflector far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated onto the light-emitting plate and are subjected to total reflection, to the light-emitting plate for emergence;

In some embodiments, the light incident surface of the primary reflector has an included angle gamma with the plane of the light emergent plate, wherein, gamma is more than or equal to 15 degrees and less than or equal to 80 degrees; and/or the number of the groups of groups,

the included angle between the first optical inclined plane of the secondary reflector and the plane of the light-emitting plate is smaller than the included angle between the second optical inclined plane and the plane of the light-emitting plate, and the included angle between the second optical inclined plane and the plane of the light-emitting plate is smaller than the included angle between the third optical inclined plane and the plane of the light-emitting plate;

in some embodiments, the boundary light incident from the midpoint of the light-incident surface of the primary reflector to the upper end point of the fourth reflecting surface satisfies the relationship:

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₁ Is incident to the end point of the fourth reflecting surface at the midpoint of the light incident surfaceThe included angle delta between the boundary light and the main optical axis of the first light beam ₁ The included angle C between the first optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned is not less than 15 degrees;

in some embodiments, the boundary light incident from the midpoint of the light-incident surface of the primary reflector to the upper end point of the first reflecting surface satisfies the relationship:

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₂ An included angle delta between boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface and the main optical axis of the first light beam ₂ Is the included angle delta between the second optical inclined plane of the secondary reflector and the plane of the light-emitting plate ₃ The included angle between the third optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned;

in a second aspect, the present invention provides a lamp, comprising:

a housing;

the light-emitting piece is arranged in the shell and provides incident light rays;

the first-stage reflector is arranged in the shell and comprises at least one optical reflection cavity, the optical reflection cavity is provided with a side wall, a light inlet surface and a light outlet surface which are formed on two sides of the side wall and are opposite to each other, incident light of the light emitting element enters the optical reflection cavity through the light inlet surface, and forms a first light beam after being reflected by the side wall of the optical reflection cavity and exits through the light outlet surface;

the second-stage reflector is arranged in the shell, is opposite to the first-stage reflector, is positioned on one side of the first-stage reflector far away from the luminous element, and is provided with a reflecting surface, and the first light beam emitted by the first-stage reflector is reflected by the reflecting surface of the second-stage reflector to form a second light beam and is emitted;

the primary reflector is arranged in an offset manner compared with the secondary reflector, so that an included angle alpha is formed between the light incident surface of the primary reflector and the reflecting surface of the secondary reflector, light which is incident from the midpoint of the light incident surface and is perpendicular to the light incident surface by the light emitting element is used as a first light beam main optical axis, light which is emitted after being reflected by the secondary reflector on the first light beam main optical axis is used as a second light beam main optical axis, and the second light beam which is emitted is asymmetrically distributed compared with the light beam main optical axis due to the arrangement of the included angle alpha;

In some embodiments, the optically reflective cavity comprises: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged; the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are sequentially connected, the cross section parallel to the light incident surface is formed through the optical reflecting cavity, and the section lines of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are straight line segments;

the primary reflector is offset from the secondary reflector such that the fourth reflective surface of the optical reflective cavity is closer to the secondary reflector than the first reflective surface, wherein,

in some embodiments, the optical reflection cavity further includes a second reflection surface disposed between the first reflection surface and the third reflection surface and a sixth reflection surface disposed between the first reflection surface and the fifth reflection surface, the second reflection surface and the sixth reflection surface being used for adjusting the divergence shape and the light intensity distribution of the first light beam; the profile line of the second reflecting surface and the sixth reflecting surface is an outward convex arc line;

In some embodiments, the secondary reflector comprises a first optical inclined surface and a second optical inclined surface which are connected with each other, and the lengths and/or the inclination angles of the first optical inclined surface and the second optical inclined surface are different;

the first-stage reflector and the second-stage reflector are oppositely arranged, and the first-stage reflector is arranged at one end of the second-stage reflector, which is close to the first optical inclined plane;

In some embodiments, the luminaire further comprises a light-emitting plate arranged downstream of and opposite to the second light beam of the secondary reflector, the second light beam exiting through the light-emitting plate; the second-stage reflector further comprises a third optical inclined plane, the third optical inclined plane is arranged at one end of the second optical inclined plane of the second-stage reflector far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated onto the light-emitting plate and are subjected to total reflection, to the light-emitting plate for emitting;

An included angle gamma is formed between the light incident surface of the primary reflector and the plane where the light emergent plate is located, wherein gamma is more than or equal to 15 degrees and less than or equal to 80 degrees;

in some embodiments of the present invention, in some embodiments,

boundary light rays entering the upper end point of the fourth reflecting surface from the middle point of the light entering surface of the primary reflector satisfy the relation:

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₁ An included angle delta between the boundary light entering the middle point of the light entering surface and the upper end point of the fourth reflecting surface and the main optical axis of the first light beam ₁ The included angle C between the first optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned is not less than 15 degrees; and/or:

boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface of the primary reflector satisfy the relation:

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

wherein, gamma is the first levelAn included angle theta between the light incident surface of the reflector and the plane where the light emergent plate is positioned ₂ An included angle delta between boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface and the main optical axis of the first light beam ₂ Is the included angle delta between the second optical inclined plane of the secondary reflector and the plane of the light-emitting plate ₃ The included angle between the third optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned;

in some embodiments, the light-emitting element comprises a plurality of light-emitting sources, the primary reflector comprises a plurality of optical reflection cavities, and the plurality of light-emitting sources are in one-to-one correspondence with the plurality of optical reflection cavities and are respectively arranged at the light incident surfaces of the plurality of optical reflection cavities;

in some embodiments, the light-emitting plate is a rayleigh scattering plate, and the second light beam emitted by the secondary reflector is rayleigh scattered by the rayleigh scattering plate to form diffuse light mainly comprising blue light and directional light mainly comprising non-blue light; wherein the central wavelength range of the blue light is 450-500 nanometers.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:

the application aims to provide an asymmetric light distribution lamp system with an approximately rectangular illumination area and better illumination uniformity distribution of the illumination area.

The method is used for overcoming the defects of high power consumption, light energy dispersion, low actual light utilization rate of a reading area and the like in the related technology.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort.

Fig. 1 is a schematic view of an illumination evaluation range according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a light source according to an embodiment of the present invention.

Fig. 3 is a side view of a light source according to an embodiment of the present invention.

Fig. 4 is a schematic structural diagram of a primary reflector according to an embodiment of the present invention.

Figure 5 is a schematic view of a lamp according to an embodiment of the present invention,

fig. 6 is a schematic diagram of an outline of an optical reflection cavity according to an embodiment of the present invention.

Fig. 7 is a schematic diagram of outlines of a first reflecting surface and a fourth reflecting surface according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of contour lines of a third reflecting surface and a fifth reflecting surface according to an embodiment of the present invention.

Fig. 9 is a schematic diagram of outlines of a second reflecting surface and a sixth reflecting surface according to an embodiment of the present invention.

Fig. 10 is a schematic view of a circumferential contour of a reflective surface of an optical reflective cavity according to an embodiment of the present invention.

Fig. 11 is a schematic structural diagram of a secondary reflector according to an embodiment of the present invention.

Fig. 12 is a schematic diagram of a light reflection relationship between a primary reflector and a secondary reflector according to an embodiment of the present invention.

FIG. 13 is a schematic view illustrating the relationship between the reflection angles of the primary reflector and the secondary reflector according to an embodiment of the present invention.

Fig. 14 is a schematic view of the shapes of the first reflecting surface and the fourth reflecting surface according to the embodiment of the present invention.

Fig. 15 is a schematic diagram of a reflection effect of a conventional optical reflection cavity according to an embodiment of the present invention.

FIG. 16 is a schematic view of a reflective effect of a curved optical reflective cavity according to an embodiment of the present invention

FIG. 17 is a schematic diagram of a light constraint relationship according to an embodiment of the present invention.

Fig. 18 is a schematic diagram of a light intensity mapping distribution according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the invention. Rather, they are merely examples of apparatus and methods consistent with aspects of the invention as detailed in the accompanying claims.

In the description of the present invention, it should be noted that the azimuth or positional relationship indicated by the terms "inner", "outer", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "contacting," and "communicating" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the related art, the radiation angle distribution of the LED as a light source is 110 ° to 120 ° lambertian distribution, specifically, the incident energy is isotropic reflected energy around the entire hemispherical space with the incident point as the center, and if the light distribution design is not performed, glare is formed, a circular light spot with a larger area is caused, and the problem of dispersion of the incident energy exists.

In order to achieve the design requirements of more efficient utilization of light energy, uniform distribution of illumination of a target surface and the like, lenses and reflectors are generally used for converging or diverging light rays emitted by a light source through refraction and reflection, so that the effect of changing the size of an emergent light angle and therefore the effect of changing the illumination area and the uniformity of illumination is achieved.

In the field of screen hanging lamps, asymmetric light distribution is adopted, so that light energy is concentrated in a desktop reading area, no light exists in the vertical direction close to a screen, and the included angle between light rays in the direction far away from the screen is not more than that of eyes, so that glare caused by reflected light of the screen and direct light of a lamp source entering the eyes is avoided.

The lamp provided by the invention can be arranged at the top of a screen, is used for providing auxiliary illumination, and can solve the problems of high power consumption, light energy dispersion, low actual light utilization rate of a reading area and the like in the related technology.

The first aspect of the present invention provides an optical system, as shown in fig. 2, in which an asymmetric approximately rectangular light distribution mode is adopted, so as to improve the energy utilization rate of the outgoing light of the optical system to the maximum extent; as shown in fig. 3, includes:

the primary reflector is arranged in an offset manner compared with the secondary reflector, so that an included angle alpha is formed between the light incident surface of the primary reflector and the reflecting surface of the secondary reflector, light which is incident from the midpoint of the light incident surface and is perpendicular to the light incident surface by the light emitting element is used as a first light beam main optical axis, light which is emitted after being reflected by the secondary reflector on the first light beam main optical axis is used as a second light beam main optical axis, and the second light beam which is emitted is asymmetrically distributed compared with the second light beam main optical axis due to the included angle alpha.

In an example, the primary reflector is offset from the secondary reflector by an angle α, so that the primary light beam received by the secondary reflector is asymmetric with respect to the primary optical axis of the primary light beam, and the secondary light beam emitted by the secondary reflector is asymmetrically distributed with respect to the primary optical axis of the secondary light beam. Thereby realizing the purpose of the light incidence surface of the primary reflector of the asymmetric light distribution.

In an example, as shown in fig. 3, the light outlet has a proximal end and a distal end compared to the light emitting member, the primary reflector is disposed at the proximal end of the light outlet, and the secondary reflector is disposed at least at the distal end of the light outlet.

According to the invention, asymmetric light distribution is realized through the position angle relation of the primary reflector and the secondary reflector, and meanwhile, the light distribution uniformity is effectively improved through the two-stage light distribution of the primary reflector and the secondary reflector.

In an example, the side wall of the primary reflector has a first side wall and a second side wall disposed opposite each other, the primary reflector being offset from the secondary reflector such that the first side wall is closer to the second reflector than the second side wall,

and/or the included angle between the first side wall and the first light beam main optical axis is smaller than the included angle between the second side wall and the first light beam main optical axis, so that the first light beam is asymmetrically distributed compared with the first light beam main optical axis.

As shown in fig. 4, the first and second sidewalls, the structure with one long side and one short side, and the arrangement features in the luminaire system. The asymmetric light distribution effect is further improved, specifically, the light quantity of the light reflected to the user side is increased due to the long characteristic of one side, the quantity of the light directly irradiated to the secondary reflector and then emitted to the near end is shielded, the asymmetric light distribution effect is further improved, and meanwhile, the asymmetric light distribution uniformity of an irradiated area is improved.

In an example, the primary reflector is configured to constrain the divergent shape of the light incident from the light emitting element and to adjust the intensity distribution of the light to form a first light beam asymmetrically distributed with respect to the primary optical axis of the first light beam.

In the related art lamp illumination schematic diagram shown in fig. 5, AB is a beam with the same beam angle, the illumination area has a proximal end and a distal end with respect to the lamp, and the area B to be covered when the distal end is illuminated by the beam angle with the same beam angle is far greater than the area a to be covered when the proximal end is illuminated. Namely, the problem of insufficient illuminance exists at the far end. Therefore, it is necessary to adjust the light intensity distribution so that the light intensity distribution of the outgoing light is also asymmetric. The light intensity of the light emitted by the light source corresponding to the far end needs to be larger than that of the light emitted by the near end, namely the light intensity distribution of the emitted light is asymmetric.

In an example, as shown in fig. 4 and 6, the optical reflection cavity includes: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged;

The optical reflection cavity of the primary reflecting member may be linear in cross section as shown in the drawings, but is not limited thereto, and in other examples, the cross section of the optical reflection cavity may be curved, the curved reflecting member may be a plurality of continuous smooth curves, and the slopes of the plurality of curves may be different.

Each of the optically reflective cavities may be, for example, the same shape and length, but is not limited thereto, and in other examples each of the optically reflective cavities may also be a different shape and different length,

the optical reflection cavity can be made of resin or metal material with smooth surface capable of reflecting light, or the resin or metal surface is coated with luminous coating to reflect the light irradiated on the resin or metal surface. The first light beam reflected by the optical reflection cavity is more uniform.

In the propagation direction of the incident light, at least one of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface is inclined outwards, so that the light emergent surface of the optical reflecting cavity is larger than the light incident surface.

The first light beam is reasonably distributed to the secondary reflector, and the problem that the uniform performance of light distribution is affected due to the fact that the first light beam is intensively reflected to a certain optical inclined plane of the secondary reflector is avoided.

In an example, the primary reflector is offset from the secondary reflector such that the fourth reflective surface of the optical reflective cavity is closer to the secondary reflector than the first reflective surface, wherein an angle of the fourth reflective surface to the primary optical axis of the first beam is less than an angle of the first reflective surface to the primary optical axis of the first beam, and/or a height of the fourth reflective surface is greater than a height of the first reflective surface.

In an example, the optical reflection cavity further includes a second reflection surface disposed between the first reflection surface and the third reflection surface, and a sixth reflection surface disposed between the first reflection surface and the fifth reflection surface, where the second reflection surface and the sixth reflection surface are used for adjusting the divergence shape and the light intensity distribution of the first light beam;

the optical reflection cavity is made to be parallel to the light incident surface, and the contour lines of the second reflection surface and the sixth reflection surface are convex arcs. Such that the optical projection of the primary reflector is approximately rectangular.

Because the actual effective working area is generally a rectangular area, the illumination brightness of the left and right corners of the far end is improved through the arrangement of the second reflecting surface and the sixth reflecting surface, rectangular light distribution is further realized, and the illumination uniformity of the illumination area is improved.

In an example, the second and sixth reflective surfaces are near the a-end shown in fig. 3 and 4.

As shown in fig. 4 and 6, a plane perpendicular to the XY plane is used to intersect the first reflecting surface, the second reflecting surface, the third reflecting surface, the fourth reflecting surface, the fifth reflecting surface and the sixth reflecting surface, respectively, so that the contour lines of the reflecting surfaces can be obtained.

As shown in fig. 7, the contour lines of the first reflecting surface and the fourth reflecting surface remain unchanged in the X direction.

As shown in fig. 8, the contour lines of the third reflecting surface and the fifth reflecting surface remain unchanged in the Y direction.

As shown in fig. 9, the contour lines of the second and sixth reflection surfaces change in the X direction or the Y direction.

As shown in fig. 9, the second reflecting surface and the sixth reflecting surface are intersected by a tangential plane parallel to the XY plane, so as to obtain an intersecting arc line 12 with the second reflecting surface and an intersecting arc line 34 with the sixth reflecting surface, and the intersecting arc line is in the shape of an outer convex arc line.

As shown in fig. 10, the first reflecting surface, the second reflecting surface, the third reflecting surface, the fourth reflecting surface, the fifth reflecting surface, and the sixth reflecting surface are intersected by a tangential plane parallel to the XY plane, so that the contour line of the primary reflector in the circumferential direction is obtained, and the shape is approximately rectangular.

As shown in fig. 15 and 16, the primary reflector is composed of six reflecting surfaces connected with each other to form a reflecting surface, and the outgoing light is secondarily distributed.

In an example, the length of the first reflective surface of the optical cavity is greater than the length of the fourth reflective surface;

as shown in fig. 14, the first reflecting surface and the fourth reflecting surface of the two main reflecting surfaces of the primary reflector are different in shape and size.

In an example, the secondary reflector is configured to adjust the longitudinal divergence shape and longitudinal light intensity distribution of the first light beam to form a second light beam;

The secondary reflector comprises a first optical inclined plane and a second optical inclined plane which are connected with each other, and the lengths and/or the inclined angles of the first optical inclined plane and the second optical inclined plane are different.

As shown in fig. 11, the first optical inclined plane is a first working plane, and the second optical inclined plane is a second working plane.

The inclination angles of the first optical inclined plane and the second optical inclined plane are longitudinal inclination angles, and the purpose is to adjust longitudinal light intensity distribution by adjusting the inclination angles of the first optical inclined plane and the second optical inclined plane, so that an irradiation area is moved forward to a user side as much as possible, and the longitudinal light intensity distribution is further adjusted.

In an example, the primary reflector is disposed opposite the secondary reflector, and the primary reflector is disposed at an end of the secondary reflector proximate the first optical bevel;

The second-stage reflector reflects light to the near end through the first optical inclined plane and reflects light to the far end through the second optical inclined plane, so that the purposes of adjusting the longitudinal divergence shape and the longitudinal light intensity distribution are achieved.

In an example, the optical system further includes a light-emitting plate disposed downstream of the secondary reflector and disposed opposite the secondary reflector, the second light beam exiting through the light-emitting plate; wherein,

the secondary reflector further includes a third optical bevel, as shown in fig. 11, which is a third working surface; the third optical inclined plane is arranged at one end of the second optical inclined plane of the secondary reflector, which is far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated on the light emitting plate by the second light beam and are subjected to total reflection, back to the light emitting plate for emitting.

In the example of the implementation of the method,

an included angle gamma is formed between the light incident surface of the primary reflector and the plane where the light emergent plate is located, wherein gamma is more than or equal to 15 degrees and less than or equal to 80 degrees; and/or the number of the groups of groups,

the included angle between the first optical inclined plane of the secondary reflector and the plane of the light-emitting plate is smaller than the included angle between the second optical inclined plane and the plane of the light-emitting plate, and the included angle between the second optical inclined plane and the plane of the light-emitting plate is smaller than the included angle between the third optical inclined plane and the plane of the light-emitting plate. In an example, the primary reflector is arranged in a biased manner relative to the light emitting plate, so that an asymmetric light distribution effect is further improved. When the included angle between the km section and the st horizontal plane is reduced, as shown in fig. 13 and 18, the light rays from the optical angles of and oj are reflected to the front part of the light emitting surface st and then emitted, so that the light ray emitting efficiency is improved.

In an example, the boundary light ray entering from the midpoint of the light entering surface of the primary reflector to the upper end point of the fourth reflecting surface satisfies the relationship:

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₁ An included angle delta between the boundary light entering the middle point of the light entering surface and the upper end point of the fourth reflecting surface and the main optical axis of the first light beam ₁ The included angle C between the first optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned is not less than 15 degrees.

In an example, as shown in fig. 13 and fig. 18, in order to ensure that the boundary light oc can smoothly exit from the light-exiting mask st after being reflected by the first optical inclined plane of the secondary reflector, thereby ensuring light-exiting efficiency. In an example, the boundary light incident from the midpoint of the light incident surface of the primary reflector to the upper end point of the first reflecting surface satisfies the relationship:

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₂ An included angle delta between boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface and the main optical axis of the first light beam ₂ Is the included angle delta between the second optical inclined plane of the secondary reflector and the plane of the light-emitting plate ₃ Is the included angle between the third optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned.

In an example, as shown in fig. 13 and fig. 18, in order to ensure that the boundary light oh can smoothly exit from the light-exit cover st after being reflected by the second optical inclined plane of the secondary reflector, thereby ensuring the light-exit efficiency.

Specific embodiments of the optical system may be described by the following steps:

the light emitting member is installed, and an LED lamp is used as a light source in this example.

A primary reflector is arranged including an optically reflective cavity. The side wall of the optical reflection cavity is designed to be provided with a first side wall, a second side wall, a light incident surface and a light emergent surface. The tilt angles and the height differences of the first and second sidewalls are adjusted to control the asymmetric distribution of the light beam.

In the primary reflector, incident light of the light emitting element enters the optical reflection cavity through the light incident surface, and the light is reflected in the optical reflection cavity for multiple times to form a first light beam.

A secondary reflector is arranged comprising a reflective surface. The first light beam is reflected by the reflecting surface of the secondary reflector to form a second light beam. The second-stage reflector enables the second light beam to have asymmetric distribution when exiting from the light-emitting surface.

According to practical requirements, a second reflecting surface and a sixth reflecting surface can be arranged in the optical reflecting cavity so as to further adjust the divergence shape and the light intensity distribution of the first light beam.

The secondary reflector may include a first optical bevel and a second optical bevel, which may be different in length and/or tilt angle to adjust the longitudinal divergence shape and intensity distribution of the first light beam.

The primary reflector and the secondary reflector are oppositely arranged, so that the included angle alpha between the light incident surface of the primary reflector and the reflecting surface of the secondary reflector meets the design requirement, and the asymmetrically distributed second light beam is obtained.

And a light emitting plate is arranged, the light emitting plate is arranged opposite to the secondary reflector, and the second light beam exits through the light emitting plate.

According to actual demands, the second-stage reflector can be provided with a third optical inclined plane so as to adjust the light distribution when the second light beam irradiates the light-emitting plate and ensure that the light can be effectively reflected and emitted.

According to the relational expressions (1) and (2), calculating the angle relation between the primary reflector and the secondary reflector, and ensuring that the boundary rays of the light beam meet specific angle requirements so as to optimize the performance of the optical system.

By the above steps, an arrangement of the optical system can be achieved, thereby obtaining an optical device having an asymmetric beam distribution.

In a second aspect, the present embodiment provides a lamp, as shown in fig. 2, including:

a housing;

in an example, an LED lamp and/or a lens may be employed as the light emitting source of the light emitting member. The first-stage reflector is arranged in the shell and comprises at least one optical reflection cavity, the optical reflection cavity is provided with a side wall, a light inlet surface and a light outlet surface which are formed on two sides of the side wall and are opposite to each other, incident light of the light emitting element enters the optical reflection cavity through the light inlet surface, and forms a first light beam after being reflected by the side wall of the optical reflection cavity and exits through the light outlet surface;

From the trend of the emergent light, the light is emitted from the point o through the primary reflector, reaches the secondary reflector, and is emitted after being reflected by the secondary reflector. The light rays emitted from the primary reflector are mostly projected to the first optical inclined plane and the second optical inclined plane of the secondary reflector, and are mainly projected to the reader side after being reflected by the secondary reflector, so that a light distribution mode asymmetrically distributed in the V direction of fig. 1 or the V direction of fig. 1 is formed.

In an example, the optical reflective cavity includes: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged; the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are sequentially connected, the cross section parallel to the light incident surface is formed through the optical reflecting cavity, and the cross section lines of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface can be straight line segments;

as shown in fig. 4, the optical reflection cavity has two opposite side walls, a structure with one long side and one short side, and an arrangement feature in the lamp system. The asymmetric light distribution effect is further improved, specifically, the light quantity of the light reflected to the user side is increased due to the long characteristic of one side, the quantity of the light directly irradiated to the secondary reflector and then emitted to the near end is shielded, the asymmetric light distribution effect is further improved, and meanwhile, the asymmetric light distribution uniformity of an irradiated area is improved.

As shown in fig. 5, in the related art lamp illumination schematic diagram, AB is a beam with the same beam angle, the illumination area has a proximal end and a distal end with respect to the lamp, and the area B to be covered when the distal end is illuminated by the beam angle with the same beam angle is far greater than the area a to be covered when the proximal end is illuminated. Namely, the problem of insufficient illuminance exists at the far end. Therefore, it is necessary to adjust the light intensity distribution so that the light intensity distribution of the outgoing light is also asymmetric. The light intensity of the light emitted by the light source corresponding to the far end needs to be larger than that of the light emitted by the near end, namely the light intensity distribution of the emitted light is asymmetric.

the included angle between the fourth reflecting surface and the first light beam main optical axis is smaller than the included angle between the first reflecting surface and the first light beam main optical axis, and/or the height of the fourth reflecting surface is larger than the height of the first reflecting surface.

The rectangular light distribution characteristics of the second reflecting surface and the sixth reflecting surface are beneficial to increasing the illuminance of the two corner areas P1 and P2 of the illuminance evaluation area K of the read-write operation table surface near the lamp side shown in fig. 4.

As shown in fig. 15, the light rays exit from o ' along ova ' toward the upper left corner, are reflected at the upper left corner point a ', and exit along directions a's '.

As shown in fig. 16, the light rays leave from o along oak exit toward the upper left corner, are reflected at the upper left corner point a, and exit along direction ab.

For reasonable comparison, the angles of ova' and oak and the Y direction are the same on the XY plane.

As can be seen by comparison, the optical reflection cavity shown in fig. 15 has a larger divergence angle in the X direction of the reflected light rays a's' than the reflected light rays ab, and the reflected light rays a's' tend to expand outward, while the reflected light rays ab tend to converge inward, compared to the optical reflection cavity shown in fig. 16.

As shown in fig. 3, the light rays are emitted from the primary reflector, reflected by the secondary reflector, and emitted from the primary reflector, and because the primary reflector is offset and positioned near the first optical inclined surface side of the secondary reflector, and the primary reflector has a mounting inclination, most of the light rays are emitted to the reader side shown in fig. 11, and relatively less light rays are emitted to the luminaire side shown in fig. 4.

As shown in fig. 11, the light distribution at the two corner points P1 and P2 of the illuminance evaluation area near the lamp side is relatively small, and the illuminance is low.

To address this deficiency, the primary reflector adds a second reflective surface and a sixth reflective surface. Thereby enhancing the light distribution of the two corner points P1 and P2 of the illuminance evaluation area on the luminaire side.

In an example, the optical reflection cavity further includes a second reflection surface disposed between the first reflection surface and the third reflection surface, and a sixth reflection surface disposed between the first reflection surface and the fifth reflection surface, where the second reflection surface and the sixth reflection surface are used for adjusting the divergence shape and the light intensity distribution of the first light beam; wherein,

the cross section of the optical reflection cavity is parallel to the light incident surface, and the contour lines of the second reflection surface and the sixth reflection surface are convex arcs.

The secondary reflector is configured such that the first optical bevel is configured to reflect a portion of the first light beam from the primary reflector to a distal end and the second optical bevel is configured to reflect another portion of the first light beam to a proximal end, wherein the distal end is an end of the second light beam that is distal from the primary reflector and the proximal end is an end of the second light beam that is proximal to the primary reflector.

In an example, the lamp further comprises a light emitting plate, the light emitting plate is arranged below the secondary reflector and is opposite to the secondary reflector, and the second light beam exits through the light emitting plate; the second-stage reflector further comprises a third optical inclined plane, the third optical inclined plane is arranged at one end of the second optical inclined plane of the second-stage reflector far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated onto the light-emitting plate and are subjected to total reflection, to the light-emitting plate for emitting;

the included angle between the first optical inclined plane of the secondary reflector and the plane of the light-emitting plate is smaller than the included angle between the second optical inclined plane and the plane of the light-emitting plate, and the included angle between the second optical inclined plane and the plane of the light-emitting plate is smaller than the included angle between the third optical inclined plane and the plane of the light-emitting plate.

In an example, as shown in fig. 12 and fig. 13, boundary light oc corresponding to an upper end point f of a fourth reflection surface of the primary reflector is in order to ensure that the boundary light oc can be smoothly emitted from the light emitting cover st after being reflected by the first optical inclined surface of the secondary reflector, thereby ensuring light emitting efficiency;

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light-in surface of the primary reflector and the plane of the light-out plate, theta ₁ An included angle delta between the boundary light entering the middle point of the light entering surface and the upper end point of the fourth reflecting surface and the main optical axis of the first light beam ₁ The included angle C between the first optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned is not less than 15 degrees;

in an example, as shown in fig. 13, boundary light oh corresponding to an upper end point h of the first reflecting surface of the primary reflector is in order to ensure that the boundary light oh can be smoothly emitted from the light emitting mask st after being reflected by the second optical inclined surface of the secondary reflector, thereby ensuring light emitting efficiency;

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

In an example, the light emitting member includes a plurality of light emitting sources, and the primary reflector includes a plurality of optical reflection cavities, where the plurality of light emitting sources are in one-to-one correspondence with the plurality of optical reflection cavities and are respectively disposed at light incident surfaces of the plurality of optical reflection cavities.

In the example, the light emitting plate is a Rayleigh scattering plate, and the second light beam emitted by the secondary reflector is subjected to Rayleigh scattering through the Rayleigh scattering plate to form diffuse light mainly comprising blue light and directional light mainly comprising non-blue light; wherein the central wavelength range of the blue light is 400-500 nanometers.

The short wavelength light in the emergent light is subjected to Rayleigh scattering through the Rayleigh scattering plate, the long wavelength light is mainly blue light, the blue sky effect is used for simulating a blue sky, the rest of the unscattered long wavelength light is transmitted from the Rayleigh Li Ban, and the long wavelength light is mainly non-blue light and is used for simulating the sunlight transmission effect. Because the light source of the application is subjected to the two-stage asymmetric light distribution, the emergent light is approximately rectangular light distribution with high orientation, so that the light with long wavelength transmitted by the Rayleigh scattering plate has better light orientation, the emergent surface is approximately rectangular, and the effect of shining the sun on the ground through a window is more similar. The blue sky and the sunlight irradiation effect can be better simulated.

Further illustrating the objects of the present invention, as shown in FIG. 1, the mutual positional relationship of the lamp, the reader, and the illuminance uniformity evaluation area; u, V represents two directions of the reading and writing work table. As shown in fig. 3, 4, 6, 7, 8, 9 and 10, the light distribution in the direction X will eventually correspond to the light distribution in the direction U in fig. 1, and as shown in fig. 3, 4, 6, 7, 8, 9 and 10, the light distribution in the direction Y will correspond to the light distribution in the direction V in fig. 1.

As shown in fig. 17, the cone 05678 is a rectangular pyramid, and the plane 1234 is assumed to be parallel to the plane 5678, and the quadrangle 1234 and the quadrangle 5678 are in a similar relationship according to the rule in solid geometry. If quadrilateral 5678 is rectangular, then quadrilateral 1234 is also rectangular. If quadrilateral 1234 is rectangular, then quadrilateral 5678 is also rectangular.

As shown in fig. 17, point 0 is the location of the light source and 1234 is the outline of the light exit of the reflector. The light source exit from point 0 is confined within cone 01234 so that in the 1234 plane the outer profile of the spot is quadrilateral 1234.

Thus, after a distance, the light is projected onto the plane 5678, and the light is also confined within the rectangle 5678, and the outer contour of the light spot is the quadrangle 5678.

Here, it is assumed that 1234 is parallel to 5678, and that the shape of 1234 is the same as that of 5678. Therefore, if the outline 1234 of the reflector exit is approximately rectangular, the shape of the boundary 5678 of the spot on the light projection surface at a distance will also be approximately rectangular.

In the view angle shown in fig. 18, the light emitted from the light source is emitted from the o-point, the light distributed between oe and of is incident on the reflecting surface ef of the primary reflector, and the reflected light is projected onto the mn section of the secondary reflector, i.e. the first optical inclined plane, and then reflected by the second optical inclined plane to be projected onto the read-write operation area. The area of distribution of the portion of the outgoing light on the read-write operation area is located at the end near the reader side as shown in fig. 1.

In the view angle shown in fig. 18, the light rays emitted from the light source emerge from the o-point, and the light rays distributed between the of and oj are not reflected by the primary reflector, and are directly projected onto the km section of the secondary reflector, or the first optical inclined plane.

As shown in fig. 18, in view angle, the first optical inclined plane has a smaller inclination angle than the second optical inclined plane, i.e. the angle between the km section and the light exit surface st is smaller than the angle between the mn section and the light exit surface st, i.e. the angle is more gentle than the km section. Because, when the included angle between the km section and the st horizontal plane is reduced, the light rays from the positions of and oj are reflected to the front part of the light emitting surface st and then emitted, so that the light ray emitting efficiency is improved.

In the view angle shown in fig. 18, the light emitted from the light source is emitted from the o-point, the light distributed between oj and oh is not reflected by the primary reflector, and is directly projected onto the mn section of the secondary reflector, or the second optical inclined plane, and then reflected and emitted through the light emitting surface st.

As shown in fig. 18, in the view angle, the light emitted from the light source is emitted from the o point, the light distributed between oh and og is incident on the reflection surface gh of the primary reflector, and the reflected light is projected onto the mn section of the secondary reflector, i.e. the second optical inclined plane, and then reflected and emitted through the light emitting surface st.

As shown in fig. 18, in the viewing angle, the light incident on the light emitting surface st is totally reflected. A portion of the total reflection light is projected onto the nr section of the secondary reflector, that is, the third optical inclined plane, and then reflected and exits again through the light exit surface st, where the distribution area of the portion of the exit light on the read-write operation area is located near the end of the lamp side as shown in fig. 4, so as to increase the illuminance level at the end of the lamp side.

The lamp provided by the invention can realize uniform distribution of illuminance approximate to a rectangle in an irradiation area, and improves the illumination efficiency and quality. The lamp is suitable for being used for at least including down lamps, spot lamps, desk lamps and screen hanging lamps. Better lighting effects and user experience can be provided for environments that control lighting ranges and parameters.

Claims

1. An optical system, the optical system comprising:

the second-stage reflector is arranged opposite to the first-stage reflector and is positioned on one side of the light-emitting surface of the first-stage reflector, the second-stage reflector is provided with a reflecting surface, and the first light beam is reflected by the reflecting surface of the second-stage reflector to form a second light beam and is emitted;

the primary reflector is arranged in a biased manner compared with the secondary reflector, so that an included angle alpha is formed between the light incident surface of the primary reflector and the reflecting surface of the secondary reflector, light which is incident from the midpoint of the light incident surface and is perpendicular to the light incident surface of the light emitting element is used as a first light beam main optical axis, light on the first light beam main optical axis is reflected by the secondary reflector and then is used as a second light beam main optical axis, and the second light beam emitted by the included angle alpha is asymmetrically distributed compared with the second light beam main optical axis.

2. The optical system of claim 1, wherein the optical system is configured to,

the side wall of the primary reflector has a first side wall and a second side wall disposed opposite each other, the primary reflector being offset from the secondary reflector such that the first side wall is closer to the second reflector than the second side wall,

the first side wall is higher than the second side wall in height in the direction perpendicular to the light incident surface, so that the first light beam is asymmetrically distributed compared with the first light beam main optical axis;

and/or, the included angle between the first side wall and the first light beam main optical axis is smaller than the included angle between the second side wall and the first light beam main optical axis, so that the first light beam is asymmetrically distributed compared with the first light beam main optical axis.

3. The optical system of claim 1, wherein the optical system is configured to,

the primary reflector is configured to constrain the divergent shape of the light incident by the light emitting element and adjust the light intensity distribution of the light to form a first light beam asymmetrically distributed with respect to the primary optical axis of the first light beam.

4. An optical system as recited in claim 3, wherein the optical reflective cavity comprises: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged;

The first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are sequentially connected, the cross section parallel to the light incident surface is made through the optical reflecting cavity, and the section lines of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are straight line segments;

5. The optical system of claim 4, wherein the primary reflector is offset from the secondary reflector such that the fourth reflective surface of the optical reflective cavity is closer to the secondary reflector than the first reflective surface, wherein,

6. The optical system of claim 4, wherein the optical reflective cavity further comprises a second reflective surface disposed between the first reflective surface and the third reflective surface, and a sixth reflective surface disposed between the first reflective surface and a fifth reflective surface, the second reflective surface and the sixth reflective surface being configured to adjust a divergent shape and a light intensity distribution of the first light beam;

The optical reflection cavity is made into a section parallel to the light incident surface, and the contour lines of the second reflection surface and the sixth reflection surface are convex arcs.

7. The optical system of claim 6, wherein the secondary reflector is configured to adjust the longitudinal divergence shape and longitudinal intensity distribution of the first beam to form a second beam;

8. The optical system of claim 7, wherein the primary reflector is disposed opposite the secondary reflector and the primary reflector is disposed at an end of the secondary reflector proximate the first optical chamfer;

the secondary reflector is configured such that the first optical bevel is configured to reflect a portion of the first light beam from the primary reflector to a proximal end and the second optical bevel is configured to reflect another portion of the first light beam to a distal end, wherein the proximal end is an end of the second light beam that is proximate to the primary reflector and the distal end is an end of the second light beam that is proximate to the primary reflector.

9. The optical system of claim 8, further comprising a light exit plate disposed downstream of the second light beam and opposite the secondary reflector, the second light beam exiting through the light exit plate; wherein,

the secondary reflector further comprises a third optical inclined plane, the third optical inclined plane is arranged at one end of the second optical inclined plane of the secondary reflector, which is far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated onto the light-emitting plate by the second light beam and are subjected to total reflection, to the light-emitting plate for emitting.

10. The optical system of claim 9, wherein the optical system is configured to,

11. The optical system of claim 9, wherein a boundary ray incident from a midpoint of the light entrance surface of the primary reflector to an upper end point of the fourth reflecting surface satisfies the relationship:

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light incident surface of the primary reflector and the plane of the light emergent plate, and θ ₁ An included angle delta between the boundary light entering the midpoint of the light entering surface and entering the upper end point of the fourth reflecting surface and the main optical axis of the first light beam ₁ And C is not less than 15 degrees for the included angle between the first optical inclined plane of the secondary reflector and the plane where the light emitting plate is positioned.

12. The optical system of claim 9, wherein boundary light rays incident from a midpoint of the light entrance surface of the primary reflector to an upper end point of the first reflecting surface satisfy the relationship:

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

wherein, gamma is the included angle between the light incident surface of the primary reflector and the plane of the light emergent plate, and θ ₂ An included angle delta between the boundary light entering the midpoint of the light entering surface and entering the upper end point of the first reflecting surface and the main optical axis of the first light beam ₂ For the secondary reflectorAn included angle delta between the second optical inclined plane and the plane of the light-emitting plate ₃ And the included angle between the third optical inclined plane of the secondary reflector and the plane where the light-emitting plate is located is formed.

13. A luminaire, characterized in that it comprises:

a housing;

a light emitting member disposed within the housing and providing incident light;

the primary reflector is arranged in the shell and comprises at least one optical reflection cavity, the optical reflection cavity is provided with a side wall, a light inlet surface and a light outlet surface which are formed on two sides of the side wall and are opposite, incident light rays of the light emitting piece enter the optical reflection cavity through the light inlet surface, and after being reflected by the side wall of the optical reflection cavity, first light beams are formed and emitted through the light outlet surface;

14. A light fixture as recited in claim 13, wherein said optically reflective cavity comprises: the first reflecting surface and the fourth reflecting surface are oppositely arranged; a third reflecting surface and a fifth reflecting surface which are oppositely arranged; the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are sequentially connected, the cross section parallel to the light incident surface is made through the optical reflecting cavity, and the section lines of the first reflecting surface, the third reflecting surface, the fourth reflecting surface and the fifth reflecting surface are straight line segments;

the primary reflector is offset from the secondary reflector such that the fourth reflective surface of the optically reflective cavity is closer to the secondary reflector than the first reflective surface, wherein,

15. The luminaire of claim 14 further comprising a second reflective surface disposed between the first reflective surface and the third reflective surface and a sixth reflective surface disposed between the first reflective surface and the fifth reflective surface, the second reflective surface and the sixth reflective surface being configured to adjust a divergent shape and a light intensity distribution of the first light beam; wherein,

And the profile line of the second reflecting surface and the sixth reflecting surface is an outward convex arc line.

16. A luminaire as claimed in claim 14, characterized in that the secondary reflector comprises a first optical bevel and a second optical bevel connected to each other, the lengths and/or inclinations of the first optical bevel and the second optical bevel being different;

the primary reflector is arranged opposite to the secondary reflector, and the primary reflector is arranged at one end of the secondary reflector close to the first optical inclined plane;

the secondary reflector is configured such that the first optical bevel is configured to reflect a portion of the first light beam from the primary reflector to a proximal end and the second optical bevel is configured to reflect another portion of the first light beam to a distal end, wherein the proximal end is an end of the second light beam proximate the primary reflector and the distal end is an end of the second light beam distal the primary reflector.

17. A luminaire as recited in claim 16, further comprising a light exit plate disposed downstream of said second light beam and opposite said secondary reflector, said second light beam exiting through said light exit plate; the second-stage reflector further comprises a third optical inclined plane, the third optical inclined plane is arranged at one end of the second optical inclined plane of the second-stage reflector, which is far away from the first optical inclined plane, and the third optical inclined plane is configured to reflect at least part of light rays, which are irradiated on the light-emitting plate and are subjected to total reflection, of the second light beam to the light-emitting plate for emitting;

18. A light fixture as recited in claim 16, wherein,

boundary light rays entering the upper end point of the fourth reflecting surface from the midpoint of the light entering surface of the primary reflector satisfy the following relation:

γ-θ ₁ -2δ ₁ ≥C (1)

wherein, gamma is the included angle between the light incident surface of the primary reflector and the plane of the light emergent plate, and θ ₁ Boundary light rays which are incident to the upper end point of the fourth reflecting surface from the midpoint of the light incident surface and the primary light of the first light beamAngle of axis delta ₁ The included angle C between the first optical inclined plane of the secondary reflector and the plane where the light-emitting plate is positioned is not less than 15 degrees; and/or:

boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface of the primary reflector satisfy the following relation:

δ ₃ ≥90o-(γ+θ ₂ )+2δ ₂ (2)

Wherein, gamma is the included angle between the light incident surface of the primary reflector and the plane of the light emergent plate, and θ ₂ An included angle delta between boundary light rays entering the upper end point of the first reflecting surface from the midpoint of the light entering surface and the main optical axis of the light beam ₂ Is the included angle delta between the second optical inclined plane of the secondary reflector and the plane of the light-emitting plate ₃ And the included angle between the third optical inclined plane of the secondary reflector and the plane where the light-emitting plate is located is formed.

19. The luminaire of claim 13, wherein the light-emitting element comprises a plurality of light-emitting sources, and the primary reflector comprises a plurality of optical reflective cavities, wherein the plurality of light-emitting sources are in one-to-one correspondence with the plurality of optical reflective cavities and are respectively arranged at light-incident surfaces of the plurality of optical reflective cavities.

20. The luminaire of claim 17 wherein the light-exiting plate is a rayleigh-scattering plate, the second light beam exiting the secondary reflector being rayleigh-scattered by the rayleigh-scattering plate to form blue-dominant diffuse light and non-blue-dominant directional light; wherein the central wavelength range of the blue light is 400-500 nanometers.