CN212644483U - Fly-eye lens and illumination system - Google Patents

Abstract

The utility model belongs to the technical field of lighting, in particular to a fly-eye lens and a lighting system, the fly-eye lens comprises a light-transmitting plate, the light-transmitting plate is provided with two light-passing surfaces which are oppositely arranged, each light-passing surface is provided with a micro lens group, the micro lens group comprises a plurality of micro lenses, and the adjacent micro lenses are adjacently connected; the distribution of the central positions of the plurality of microlenses follows a polar equation:

r is the radius of the microlens set; n is one atomThe number of microlenses comprised by the lens group; n, r (i) is the polar diameter of the ith microlens; θ (i) is the polar angle of the ith microlens. The utility model provides a microlens arranges based on above-mentioned polar coordinate equation, and a plurality of microlenses correspond the different facula of a plurality of edge orientations of formation for obvious reinforcing can not appear or weaken in arbitrary radial ascending illuminance on the illuminated surface, and then forms the more even circular facula of illuminance.

Description

Fly-eye lens and illumination system

Technical Field

The utility model belongs to the illumination field especially relates to a fly-eye lens and lighting system.

Background

In most illumination systems, several optical devices are usually combined in a matched manner to obtain a predetermined illumination effect, for example, in a projection illumination system and a stage illumination system, etc., optical devices (such as lenses) for imaging and non-imaging are generally arranged along a preset optical path for providing uniform illumination, and of course, the optical system can also be used as an optical integrator. The fly-eye lens is one of devices for providing uniform light, and can uniformly project light to a screen or a small hole by matching with a field lens.

Referring to fig. 1, the fly-eye lens is formed by arraying a plurality of micro lenses 20 on a transparent plate 10, and light spots formed by parallel light processed by the micro lenses 20 through a field lens 30 are overlapped in the optical axis direction to realize a light uniformizing effect, but the light spots are polygonal in shape because the light spots are consistent with the micro lenses 20, and the requirements for circular light spots are higher in many occasions, so that the utilization rate of the polygonal light spots provided by the fly-eye lens is affected. For example, as shown in fig. 2 to 6, the light spot generated by the square microlens 20 is square, and for the circular light spot requirement, the area defined by the inscribed circle of the square is the utilized part. As further shown in fig. 7-11, the spot generated by the hexagonal microlens 20 is hexagonal, and when the hexagonal spot is used for a circular spot, the area defined by the inscribed circle of the hexagon is the portion to be used. Therefore, the light energy utilization rate of the traditional fly-eye lens is low.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the utility model is to provide a fly-eye lens and lighting system, aim at solving the technical problem that conventional fly-eye lens's light energy utilization is low.

In order to achieve the above object, a first aspect of the present invention provides a fly-eye lens, including a light-transmitting plate, the light-transmitting plate has two opposite light-transmitting surfaces, each of the light-transmitting surfaces is provided with a micro lens group, the micro lens group includes a plurality of micro lenses, and adjacent micro lenses are adjacently connected;

the distribution of the central positions of the plurality of microlenses follows a polar equation:

taking the central position of the micro lens group as the pole of a polar coordinate system, wherein:

r is the radius of the microlens set;

n is the number of micro lenses contained in one micro lens group, and N is a positive integer;

i＝1,2,3......N；

r (i) is the polar diameter of the center of the ith microlens in a polar coordinate system;

θ (i) a polar angle of the center of the ith microlens in the polar coordinate system;

INT is an integer function;

x is a positive number.

In one embodiment, X is any one of 0.5, 2, 2.5, 2.6, and 3.

In one embodiment, the surface shape of the microlenses is a spherical surface, the spherical curvature radius of each microlens in each microlens group is the same, the spherical curvature radius is 3mm-7mm, and the height of the spherical vertex of each microlens relative to the light-passing surface is 0.2mm-0.7 mm;

the micro lenses on the two light passing surfaces are arranged together with the optical axis, and the distance between the spherical vertexes of the two micro lenses arranged together with the optical axis is equal to the focal length of the micro lenses.

Further, the edge shape of the micro-lens comprises at least three of quadrangle, pentagon, hexagon, heptagon and octagon, and in the micro-lenses with the same number of sides, at least part of the micro-lenses have different areas and/or edge orientations.

In one embodiment, the microlens set is divided into at least a central region, a first region and a second region in order from the center thereof along a radial direction thereof;

the first area is distributed with microlenses of a first main guide surface type, the second area is distributed with microlenses of a second main guide surface type, the first main guide surface type and the second main guide surface type are different and are respectively selected from one of spherical surfaces with edges of quadrangle, pentagon, hexagon and heptagon; and is

In the first area, the micro lenses are arranged along a plurality of first vortex lines;

in the second area, the micro lenses are arranged along a plurality of second vortex lines;

the first vortex line extends from one end of the first vortex line close to the central area along a clockwise direction, and the second vortex line extends from one end of the second vortex line close to the first area along a counterclockwise direction.

The embodiment of the utility model provides a fly-eye lens, each microlens is arranged according to the mode that above-mentioned polar coordinate equation was injectd, the structure of arranging is more diversified, the orientation at microlens edge has higher irregularity, a plurality of microlenses correspond the different facula of a plurality of edge orientations of formation, make arbitrary radial illuminance can not appear obvious reinforcing or weaken on the illuminated surface, form the more even circular facula of illuminance, and then can concentrate on a circular within range with as much as possible light energy, can improve the utilization ratio of light energy in more illumination scene.

A second aspect of the present invention provides a lighting system, comprising:

a light source;

the collimating device is used for converting the light emitted by the light source into collimated light;

the fly-eye lens of any one of the above embodiments, configured to perform beam splitting and focusing on the collimated light through the micro lens thereof; and

and the focusing lens is positioned on the output optical path of the fly-eye lens and used for converging and outputting the light output by the fly-eye lens so as to obtain uniform light spots at the light outlet.

The embodiment of the utility model provides an illumination system through adopting foretell fly's eye lens, combines collimating device and focusing mirror, constitutes an even optical system, based on fly's eye lens's the structure of arranging of microlens, and this optical system can obtain the even circular facula of illuminance.

In one embodiment, the light source comprises a substrate and a plurality of LED lamp beads arranged on the substrate;

the collimating device comprises a first plate body, a plurality of first lenses, a second plate body and a plurality of second lenses;

the LED lamp comprises a first plate body, a second plate body, a plurality of through holes, a plurality of first lenses, a plurality of second lenses and a plurality of LED lamp beads, wherein the first plate body is provided with the plurality of through holes corresponding to the LED lamp beads, the first lenses are correspondingly embedded into the through holes, the second plate body covers the through holes, the second lenses are arranged corresponding to the through holes, and the LED lamp beads, the first lenses and the second lenses are arranged on.

Further, the lighting system further includes:

the frame comprises a first cavity and a second cavity which are arranged in a penetrating mode in the direction of the optical axis of the fly-eye lens, the inner wall of the first cavity is matched with the collimating device and the fly-eye lens, the inner wall of the second cavity is matched with the focusing lens, and one end, far away from the second cavity, of the first cavity is connected with the substrate in a sealing mode.

Further, the lighting system further includes:

the fixing ring is connected to one end, close to the light source, of the first cavity;

the compression ring is connected to one end, far away from the light source, of the second cavity and used for fixing the focusing mirror;

the outlines of the first cavity and the fixing ring in the direction perpendicular to the optical axis are polygonal, the outline of the second cavity in the direction perpendicular to the optical axis is circular, and one end of the first cavity, which is close to the second cavity, forms an annular step surface;

the fixing ring is fixedly connected with the step surface so as to limit the fly-eye lens between the fixing ring and the step surface.

Furthermore, the first plate body is provided with a first mounting column, the second plate body is provided with a first notch corresponding to the first mounting column, the first plate body penetrates through the first mounting column through a connecting piece to be fixedly connected with the substrate, and the second plate body is fixedly connected with the first plate body;

the retainer plate is equipped with the second erection column, the side of fly-eye lens is equipped with the logical groove that extends along the optical axis direction, the retainer plate passes through the connecting piece the second erection column with the step face is locked, just the embedding of second erection column leads to the groove.

In the optical system, the first plate body is fixed on the substrate through the connecting piece, and the second plate body is fixedly connected with the first plate body, so that the collimation device and the substrate are fixed; the fixing ring is locked with the step surface of the first cavity through the connecting piece, the fly-eye lens is limited between the fixing ring and the step surface, and the focusing mirror is fixed to the second cavity through the pressing ring, so that the fixation of the fly-eye lens, the focusing mirror and the frame is realized; the frame is locked with the substrate, so that the axial positions of the collimating device, the fly-eye lens and the focusing lens are fixed. Therefore, the structure of each element is fully utilized to realize the assembly of the optical device, the whole optical system has a compact structure, is convenient to assemble, has smaller volume, can control the size in the optical axis direction in a smaller range, is favorable for the miniaturization of the optical system, and is particularly suitable for the condition of limited use space.

On the other hand, the fixing ring, the fly-eye lens, the focusing lens and the frame form a module, the collimating device and the substrate form a module, and the frame and the substrate are locked, so that the system is better and efficient to assemble, the accumulated error is reduced, and the precision is higher.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a prior art optical path diagram of dodging based on a fly-eye lens;

FIG. 2 is a diagram of the spot effect of a fly-eye lens of a quadrilateral microlens in the prior art;

FIG. 3 is an enlarged view of a flare effect diagram of a fly-eye lens of a quadrangular microlens in the related art;

FIG. 4 is a schematic view of the illuminance in the Y direction in the speckle effect diagram of FIG. 3;

FIG. 5 is a schematic view of the illuminance in the X direction in the speckle effect diagram of FIG. 3;

FIG. 6 is a schematic diagram illustrating the comparison between the illumination intensity and the light spot gray scale in the light spot effect diagram shown in FIG. 3;

FIG. 7 is a diagram of the spot effect of a fly-eye lens of a hexagonal microlens in the prior art;

FIG. 8 is an enlarged view of a flare effect map of a fly-eye lens of a hexagonal microlens in the prior art;

FIG. 9 is a schematic view of the illuminance in the Y direction in the speckle effect diagram of FIG. 8;

FIG. 10 is a schematic view of the illuminance in the X direction in the speckle effect diagram of FIG. 8;

FIG. 11 is a schematic diagram illustrating the comparison between the illumination intensity and the light spot gray scale in the light spot effect diagram shown in FIG. 8;

fig. 12 is a schematic side view of a fly-eye lens according to an embodiment of the present invention;

fig. 13 is a schematic front view of a fly-eye lens according to an embodiment of the present invention;

fig. 14 is a schematic diagram illustrating a distribution structure of microlenses in a fly-eye lens according to an embodiment of the present invention;

fig. 15 is a schematic light path diagram of a dodging process performed based on a fly-eye lens according to an embodiment of the present invention;

fig. 16 is a schematic partial side view of a fly-eye lens according to an embodiment of the present invention;

fig. 17 is a schematic front view of a part of microlenses of a fly-eye lens according to an embodiment of the present invention;

fig. 18 is a light spot effect diagram of a fly-eye lens according to an embodiment of the present invention;

fig. 19 is an enlarged view of a light spot effect diagram of a fly-eye lens according to an embodiment of the present invention;

FIG. 20 is a schematic view of the illuminance in the Y direction in the speckle effect diagram of FIG. 18;

FIG. 21 is a schematic view of the illuminance in the X direction in the speckle effect diagram of FIG. 18;

FIG. 22 is a schematic diagram illustrating the comparison between the illuminance and the gray scale of the light spots in the light spot effect diagram of FIG. 18;

fig. 23 is a schematic structural diagram of an optical system according to an embodiment of the present invention;

FIG. 24 is an exploded view of the optical system of FIG. 23;

fig. 25 is a front view of a fly-eye lens in the optical system shown in fig. 24;

fig. 26 is a schematic view of a collimating device of an optical system according to an embodiment of the present invention;

fig. 27 is a schematic front structure view of a first plate in an optical system according to an embodiment of the present invention;

fig. 28 is a schematic back structure view of a first plate in an optical system according to an embodiment of the present invention;

fig. 29 is a schematic structural diagram of a focusing mirror and a frame in an optical system according to an embodiment of the present invention.

The various reference numbers in the figures:

100-fly eye lens;

110-light-transmitting plate, 111-light-transmitting surface, 120-microlens set, 121-microlens and through groove-130;

200-a light source;

210-a substrate, 211-a first mounting hole, 220-an LED lamp bead;

300-a collimating means;

310-a first plate, 320-a first lens, 330-a second plate, 340-a second lens;

311-through hole, 3111-notch, 312-first mounting column, 313-first positioning column, 314-cushion block;

331-a first gap, 332-a second gap;

400-a focusing mirror;

410-a flange;

500-a frame;

510-a first cavity, 520-a second cavity;

511-a step surface, 512-a second mounting hole, 513-a clearance groove and 514-an outer edge;

521-ring groove, 522-ring plane, 523-side;

600-a stationary ring;

610-a second mounting post;

700-pressing ring;

800-a sealing gasket;

810-third gap;

900-connecting block.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the embodiments of the present invention, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or in the operating state, and are only for convenience of description of the present invention, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "coupled," and the like are intended to be inclusive and mean, for example, that a connection may be fixed or removable or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The embodiment of the utility model provides a fly-eye lens 100, mainly used provide the more even facula of circular shape illuminance. As shown in fig. 12 and 13, the fly-eye lens 100 includes a light-transmitting plate 110, the light-transmitting plate 110 has two light-transmitting surfaces 111 disposed opposite to each other, one light-transmitting surface 111 is used as a light-incident surface, the other light-transmitting surface 111 is used as a light-exiting surface, each light-transmitting surface 111 is provided with a microlens group 120, the microlens group 120 includes a plurality of microlenses 121, the plurality of microlenses 121 are closely arranged on the surface of the light-transmitting plate 110, any two adjacent microlenses 121 are adjacently connected, that is, each microlens 121 intersects with each surrounding microlens 121, and the intersection line formed by the intersection is the common edge of the adjacent microlenses 121. It is understood that since any adjacent microlenses 121 are adjacently abutted, the edge of each microlens 121 assumes a polygonal structure in a direction perpendicular to the optical axis of the microlens 121, and a plurality of microlenses continuously cover the entire corresponding region of the microlens group without generating a gap.

Further referring to fig. 13, in the fly-eye lens 100, the arrangement structure of the microlenses 121 is a sunflower structure, for convenience of describing the layout of the microlenses 121, a polar coordinate system is established with the central position of the microlens group 120 as a pole and an axis parallel to the light-passing surface 111 as a polar axis, and the central positions of the microlenses 121 are distributed according to a polar coordinate equation:

wherein:

r is the radius of the microlens group 120;

n is the number of microlenses 121 included in one microlens group 120, and N is a positive integer;

i＝1,2,3......N；

r (i) is the polar diameter of the center of the ith microlens 121 in the polar coordinate system;

θ (i) the polar angle of the center of the ith microlens 121 in the polar coordinate system;

INT is an integer function;

x is a positive number.

The embodiment of the utility model provides a position parameter as shown in following table 1:

based on the polar coordinate formula, the coordinates in the corresponding two-dimensional rectangular plane coordinate system are as follows:

x(i)＝r(i)cosθ(i)

y(i)＝r(i)sinθ(i)

taking X ═ 2, R ═ 50, and N ═ 1200 as an example, the positional parameters shown in table 1 can be obtained.

Table 1: position coordinates of micro-lenses

i	r(i)	θ(i)	x(i)	y(i)
					1	1.44338	254.5584	-0.38431	1.391273
2	2.04124	149.1169	-1.75183	-1.04775
					…	…	…	…	…
…	…	…	…
					…	…	…	…	…
1200	50	190.1295	-49.2206	8.793656

Referring to fig. 14, the positions of the respective microlenses 121 defined by the above-described polar coordinate equation are as shown in fig. 14, and the distribution of the respective microlenses 121 substantially exhibits a multi-directional vortex-type layout, like a sunflower structure. With reference to fig. 15, according to the light modulation principle of the fly-eye lens 100, each microlens 121 can focus light received by the microlens 121, and further refracts the light by a focusing mirror disposed at the focal length of the microlens 121, so as to form a light spot P on the illuminated surface, where the shape of the light spot P is consistent with the contour shape of the microlens 121, the light spots formed by the microlenses 121 are overlapped in the optical axis direction, and the finally obtained light spot effect is the effect obtained after the overlapping of the light spots. The plurality of microlenses 121 in this embodiment are arranged according to the mode defined by the polar coordinate equation, the arrangement structure is more diversified, the orientation of the edge of the microlens 121 has higher irregularity, and the plurality of microlenses 121 correspondingly form a plurality of light spots with different edge orientations, so that the illuminance on the irradiated surface in any radial direction cannot be obviously enhanced or weakened, a circular light spot with more uniform illuminance is formed, further, as much light energy as possible can be concentrated in a circular range, and the utilization rate of the light energy can be improved in more illumination scenes.

Referring to fig. 18 to 22, which show the illumination effect achieved by the optical system shown in fig. 14, the light spots are circular, and in the illuminance diagrams shown in fig. 20 and 21, it can be seen that the illuminance difference between the middle and the edge of the circular light spot is small, which shows that the illuminance uniformity of the circular light spot area is good.

It should be understood that the radius R is one of the necessary parameters for generating the microlens 121 with a predetermined structure in the design stage, and the actually manufactured fly-eye lens 100 is not limited to the microlens set 120 with a circular periphery, and the fly-eye lens 100 may include the complete microlens set 120 with a radius R, or only a portion of the circular microlens set 120 with a radius R may be selected according to the requirements of the optical system in which the fly-eye lens 100 is located, and refer to fig. 25, for example, a portion covered by an internal polygon or a portion covered by other desired shapes may be taken as long as it can satisfy the necessary dodging requirements.

In one embodiment, the polar angle equation is as described above

In (3), X may be 0.5, 2, 2.5, 2.6 or 3, and the distribution of the microlenses 121 when X is 2 is illustrated in fig. 13. By setting the above values, the fly-eye lens 100 having a sunflower distribution structure can be obtained, and the distribution structure enables the roundness and the illuminance uniformity of the light spot on the illuminated surface to be better. In other embodiments, X may be other positive numbers.

The structure of fly-eye lens 100 will be further described below:

in one embodiment, the microlenses 121 on the two light-passing surfaces 111 are in a mirror-image symmetrical structure, specifically, the light-transmitting plate 110 is in a flat plate shape, the two light-passing surfaces 111 are parallel to each other, and the two microlens sets 120 are in mirror-image symmetry with respect to a middle cross section of the light-transmitting plate 110, the middle cross section being a cross section parallel to the light-passing surfaces 111 and passing through a center of the light-transmitting plate 110 in a thickness direction. In each microlens assembly 120, the surface shape of each microlens 121 is a spherical surface, and the curvature of the spherical surface is the same, and the spherical vertex of each microlens 121 is located on the same plane. The microlenses 121 on one side of the light-transmitting plate 110 and the microlenses 121 on the other side of the light-transmitting plate 110 are arranged one-to-one and on the same optical axis, and the distance between the spherical vertexes of the two microlenses 121 is equal to the focal length of the microlenses 121.

In one embodiment, the spherical radius of curvature of the microlens 121 is in the order of millimeters, and may be in particular between 3mm and 7mm, and the thickness of the microlens 121, i.e. the height of the spherical vertex relative to the light-passing surface 111, may be between 0.2mm and 0.7 mm. Thus, the size of the micro-lens 121 is limited to a preferred range so as to improve the uniformity of the light spot.

In the present embodiment, when the surface of the microlens 121 is a spherical surface, since the adjacent microlenses 121 are adjacently connected, the intersection line of the adjacent microlenses 121 must have a certain interval with the light-passing surface 111, rather than being located on the light-passing surface 111, and the intersection line is a curve in space. In addition, each microlens 121 in this embodiment continuously covers the light-passing surface 111, that is, there is no exposed area on the light-passing surface 111 corresponding to the whole microlens set 120, and each microlens 121 is adjacent to the surrounding microlens 121 without a gap, so that the light-equalizing effect is better. At this time, each intersection line generated by one microlens 121 and each microlens 121 around the microlens 121 are connected end to form a complete edge of the microlens 121, and the projection of the edge on the light-passing surface 111 is a polygon, and obviously, the number of sides of the polygon is equal to the number of microlenses 121 adjacent to the microlens 121. For example, when one microlens 121 is adjacently connected to four surrounding microlenses 121, the edge shape of the microlens 121 is a quadrangle, and when one microlens 121 is adjacently connected to five surrounding microlenses 121, the edge shape of the microlens 121 is a pentagon. The "edge shape of the microlens 121" in the embodiments of the present invention refers to a projection shape of the edge of the microlens 121 on the light-passing surface 111.

In the present embodiment, in one microlens set 120, microlenses 121 having a plurality of edge shapes are included, and for example, at least three shapes may be included. Preferably, in one microlens group 120, quadrangles, pentagons and hexagons are the main ones, and further, a small number of trilagons, heptagons and octagons may be included. Therefore, on the basis that the microlenses 121 are arranged in a sunflower shape, the uneven illumination of the edges of the light spots is further weakened after the light spots are overlapped by combining different edge shapes.

Further, in the microlenses 121 having the same number of sides, the edge orientations of at least some of the microlenses 121 are different. Preferably, in the microlenses 121 having the same number of sides, the edge orientations of more than 50% of the microlenses 121 are different. Because the shape of the light spot formed by each microlens 121 is consistent with the edge shape of the microlens 121, the microlenses 121 with the same edge shape will form the light spots with the same shape, and when the edge orientations of the microlenses 121 with the same shape are the same, the generated light spots with the same shape and the same orientation are superposed to enhance the polygon effect, so that the roundness and the uniformity of the whole light spot are reduced, therefore, the microlenses 121 with the same shape are arranged in different edge orientations, and the phenomenon can be effectively avoided.

In one embodiment, each microlens 121 is arranged in a vortex shape, referring to fig. 14, a vortex structure with different directions is formed from the center of the microlens set 120(120) along the radial direction thereof. Specifically, the microlens group 120 is divided radially outward from the center thereof into a plurality of regions, which may be divided into at least: a central region S0, a first region S1, and a second region S2; the arrangement of the microlenses 121 in the first region S1 is random and irregularly distributed, in the first region S1, the microlenses 121 are arranged along a plurality of first vortex lines L1, the first vortex lines L1 extend from one end of the first vortex lines near the central region S0 in a substantially clockwise direction, and the whole first vortex lines are in a clockwise vortex structure; in the second region S2, the microlenses 121 are arranged along a plurality of second vortex lines L2, and the second vortex lines L2 extend in a counterclockwise direction from an end thereof close to the first region S1, and have a counterclockwise vortex structure as a whole. It is understood that, since the two microlens sets 120 are symmetrical, the orientations of the first vortex lines L1 of the two microlens sets 120 are opposite and the orientation of the second vortex line L2 is also opposite in the front view direction of each microlens set 120.

Through the vortex line arrangement mode, the difference of the edge orientation of the micro lenses 121 is further increased, and especially for the micro lenses 121 with the same shape, when the micro lenses are distributed on the same vortex line, the edge orientation of the micro lenses can be ensured to be different.

In one embodiment, in a plurality of annular regions divided by different radii with the microlens group 120 as the center, one or more microlenses 121 of a dominant surface type, which means: in one region, the microlenses 121 of a certain edge shape are significantly more numerous than the other microlenses 121. In addition, the dominant profiles are not exactly the same in adjacent annular regions.

For example, in an annular region, the shape of the edges of the majority of the microlenses 121 is quadrilateral, and the shape of the dominant surface in the region is quadrilateral; in the other annular region, the edge shapes of half of the microlenses 121 are hexagonal, and the dominant surface type in this region is hexagonal. For another example, in a ring-shaped region, there are more microlenses 121 whose edges are quadrilateral and whose edges are pentagonal, and the dominant surface type in the region is quadrilateral and pentagonal; in the other annular region, there are more microlenses 121 whose edge shapes are pentagonal and whose edge shapes are hexagonal, and in this region, the dominant surface types are pentagonal and hexagonal.

Further, in the first region S1, microlenses 121 of a first dominant surface type are distributed, and in the second region S2, microlenses 121 of a second dominant surface type are distributed, and the first dominant surface type and the second dominant surface type are respectively selected from one or two kinds of spherical surfaces whose edge shapes are quadrangle, pentagon, hexagon, and heptagon. Referring to fig. 14, the first main surface type is a quadrangle and a pentagon, and the second main surface type is a hexagon.

In other embodiments, the third area, the fourth area, and the like may be further divided outside the second area.

In the embodiment of the present invention, the surface shape of the microlens is a spherical surface, and any adjacent microlenses are abutted, and one microlens is abutted with several microlenses around it without a gap, on this basis, the overlapping ratio of microlenses with various edge shapes can be determined with reference to the structural relationship shown in fig. 17, and the overlapping ratio corresponds to the number of sides of the microlens. The overlap ratio is defined as follows:

the surface of the microlens 121 extends along the corresponding spherical surface toward the light-transmitting surface 111 and intersects with the corresponding light-transmitting surface 111, the intersection line is a circle C0, a spherical crown type lenslet is formed, the area of the circle C0 is S1, and the area of the projection (hereinafter referred to as "orthographic projection") of the microlens 121 on the corresponding light-transmitting surface 111 is S2, so that the overlapping ratio is S1/S2.

It is understood that two adjacent lenslets 121 are adjacent to each other, and it can be considered that the edge portions of two adjacent lenslets overlap each other, and a lenslet and a surrounding lenslets overlap each other at the edge, i.e. a structure where a plurality of lenslets 121 are adjacent to each other is formed, the area of the overlapping portion depends on how many lenslets the lenslet is to overlap each other, i.e. the actual edge shape of the lenslet 121, and the portion of the lenslet that is not overlapped with other lenslets corresponds to the surface actually presented by the lenslet 121, and of course, the projection of the surface on the light-passing surface 111 is a polygon. The orthographic area of the microlenses 121 is determined for a given edge shape and radius of the circle C0, and further, whether the surface curvature of the microlenses 121 is larger or smaller, the orthographic area is the same, except for the surface curvature, the height of the microlenses 121 is different, the height being larger when the surface curvature of the microlenses 121 is larger and the height being smaller when the surface curvature of the microlenses 121 is smaller.

Referring specifically to fig. 17, taking the microlens 121 having a quadrangular edge shape as an example, when one microlens 121 and four microlenses 121 are adjoined, the following relationship exists:

the orthographic projection area S of the microlens 121₂Comprises the following steps:

corresponding to the area S of the circle C0₁Comprises the following steps:

the overlap ratio S1/S2 is:

wherein N is_eNumber of sides of polygon, here N_e4; the calculated overlap ratio S1/S2 is 1.57.

Specifically, the overlapping ratio of the microlenses 121 is 1.57 when the edge shape is a quadrangle, 1.32 when the edge shape is a pentagon, 1.21 when the edge shape is a hexagon, 1.15 when the edge shape is a heptagon, and 1.11 when the edge shape is an octagon.

The shape of the edge of the microlens 121 may be a quadrangle, a pentagon, a hexagon, a heptagon or an octagon, wherein the microlenses with different numbers of sides may be adjacent to each other, and the polygon may be a regular polygon or a non-regular polygon, so that the overlapping ratio is not limited to a specific value, and may be between 1.1 and 1.6.

In the embodiment of the present invention, in the design process of the fly-eye lens, the structural parameters of the micro-lens 121 can be determined by the following method:

referring to fig. 16, taking the transparent plate 110 and the microlenses 121 made of the same material as an example, assuming that the refractive index is n, the distance between the light-passing surfaces 111 on both sides of the transparent plate 110 is T, the diameter of the circle C0 is d, the radius is a, the radius of curvature of the spherical surface is r, and the focal length of the microlenses 121 is f', then:

(r-h)²＝r²-a²

in addition:

then:

from the above reasoning, it can be seen that the height h and the curvature radius R of the microlens can be determined after the radius R of the microlens set, the number N of the microlenses, the refractive index N, the overlapping ratio S1/S2, and the light-passing surface interval T are determined. Of course, among the above parameters, other parameters may be predetermined, and undetermined parameters may be obtained.

Taking R as 50, N as 1200, N as 1.5, T as 10, Ratio as 1.44, as an example, then: h is 0.44 and r is 3.62.

According to the above calculation method, during the design process of fly-eye lens 100, some parameters, such as R, N, T, Ratio, and polar angle equation, can be determined first under a predetermined polar coordinate equation

X in (1), other structural parameters of the microlens 121 can be generated.

The embodiment of the utility model provides a further provide an illumination system, specifically be an even light illumination system that can produce circular facula, combine fig. 23 and fig. 24, this illumination system includes compound eye lens 100 that any above-mentioned embodiment provided to and light source 200, collimating device 300 and focusing mirror 400, and light source 200, collimating device 300, compound eye lens 100 and focusing mirror 400 set gradually along light path transmission direction. The light source 200 is used to emit an initial light ray, which is generally a divergent light beam, and the collimating device 300 is used to convert the initial light ray into collimated light, which may be a parallel light beam or a light beam with a certain beam angle. Fly-eye lens 100 focuses the collimated light beam, i.e. each microlens 121 focuses the portion of the small light beam incident thereon; the focusing mirror 400 further refracts and outputs the light output from the fly-eye lens 100 to obtain a uniform spot at the light exit of the system.

Referring to fig. 25, the fly-eye lens 100 includes the light-transmitting plate 110 and the microlens set 120 according to the above-mentioned embodiment, and in order to facilitate assembly, a coating layer is disposed on a side surface of the light-transmitting plate 110, and the coating layer may be metal or plastic, and the embodiment is not limited.

By adopting the fly-eye lens 100, the collimating device 300 and the focusing mirror 400 are combined to form a light homogenizing optical system, and based on the arrangement structure of the micro lenses 121 of the fly-eye lens 100, the optical system can obtain circular light spots with uniform illumination intensity.

In one embodiment, the light source 200 includes a substrate 210 and a plurality of LED beads 220 disposed on the substrate 210, and each LED bead 220 is preferably arranged in a lattice form with uniform intervals to form a structure similar to the surface light source 200, so that uniform initial light with a small divergence angle can be provided as much as possible.

In this embodiment, the collimating device 300 may be formed by combining a plurality of collimating lens plates, and the effect of multi-step collimation is accumulated to achieve a predetermined collimation effect. Referring to fig. 26, the collimating device 300 includes a first plate 310, a second plate 330, a first lens 320 and a second lens 340, wherein the back surface of the first plate 310 is connected to the substrate 210, and the front surface of the first plate 310 is connected to the second plate 330. Referring to fig. 27, a plurality of through holes 311 are formed in the first plate 310 at positions corresponding to the LED beads 220, a first lens 320 is embedded in each through hole 311, and a second lens 340 is disposed on the second plate 330 corresponding to each through hole 311. LED lamp pearl 220, first lens 320 and second lens 340 three set gradually along the optical axis direction, and the initial light beam that first lens 320 and second lens 340 cooperation sent LED lamp pearl 220 collimates.

By inserting the first lens 320 into the through hole 311, the second board 330 covers the first board 310 without pressing the first lens 320, and the first lens 320 is easily assembled and positioned.

Further, the through hole 311 penetrates the first board 310 in the thickness direction of the first board 310, the depth of the through hole, i.e., the thickness of the first board 310, affects the distance between the first lens 320 and the second lens 340, and the depth of the through hole 311 is greater than the thickness of the first lens 320, so as to further satisfy the requirement of the collimation effect after the first lens 320 and the second lens 340 are combined.

In one embodiment, the through hole 311 is in the shape of a bowl with a narrow bottom and a wide top, the narrow end is close to the LED lamp bead 220, the wide end is close to the second plate 330, the first lens 320 is embedded near the narrow end, and the periphery of the first lens abuts against the inner wall of the through hole 311 to achieve fixing and lateral positioning. In addition, the inner wall of the through hole 311 may adjust the light output by the first lens 320 with an excessive deflection angle again, specifically, absorb the light or reflect the light to the second plate 330.

Further, the inner wall of through-hole 311 near the one end of LED lamp pearl 220 is the cylinder structure, and the center pin of cylinder and the optical axis of LED lamp pearl 220 coincide basically, correspondingly, the week side of first lens 320 also is the cylinder structure, and both butts cooperate to make things convenient for first lens 320 and LED lamp pearl 220 with the optical axis installation.

With further reference to fig. 27, to facilitate assembly of the first lens 320, a portion of the inner wall of the through hole 311 near the narrow end is formed with a notch 3111 extending in a longitudinal direction, which is the optical axis direction and also the depth direction of the through hole 311. Preferably, the number of the notch 3111 is two and is symmetrical about a plane on which the optical axis is located. In this manner, the notch 3111 can provide an operation space for the assembling tool when the first lens 320 is assembled.

In another embodiment, referring to fig. 24, a corner of the first plate 310 is provided with a first mounting post 312, a through hole is formed in the first mounting post 312, correspondingly, the substrate 210 is provided with a first mounting hole 211, and a connector such as a screw is inserted through the first mounting hole 211 and the first mounting post 312 to fix the first plate 310 to the substrate 210.

With further reference to fig. 26, the second plate 330 is stacked on the first plate 310, the second plate 330 has a first notch 331 at a position corresponding to the first mounting post 312, and the outer wall of the first mounting post 312 is inserted into the first notch 331, so as to facilitate the assembly of the second plate 330. The edge of the second plate 330 is fixedly connected to the edge of the first plate 310, and may be specifically bonded, and the first mounting column 312 may provide a location for bonding the second plate 330 to the first plate 310.

Furthermore, a first positioning column 313 is further disposed on an edge of the first plate 310, correspondingly, a second notch 332 is formed in an edge of the second plate 330, and an outer wall of the first positioning column 313 is embedded into the second notch 332, so that the second plate 330 is further convenient to assemble and the second plate 330 is laterally limited.

Referring to fig. 28, the plurality of spacers 314 are disposed on the back surface of the first board 310, and the spacers 314 are abutted to the surface of the substrate 210, and are preferably disposed at positions opposite to the first mounting posts 312, so that a certain gap is formed between the back surface of the first board 310 and the substrate 210, so as to prevent the first board 310 from pressing the LED lamp beads 220, and the gap can allow air to flow, thereby improving the heat dissipation effect.

In one embodiment, a surface of the second plate 330 facing the first plate 310 is a flat surface, so as to be able to be attached to the first plate 310 more stably, and a surface of the second plate 330 facing the fly-eye lens 100 is formed with a second lens 340, and preferably, the second lens 340 is integrally formed with the second plate 330.

Referring to fig. 24, in another embodiment of the present invention, the lighting system further includes a frame 500, the frame 500 and the substrate 210 together form an overall external structure of the optical system, and an open end of the frame 500 is abutted to the substrate 210 to cover the LED lamp bead 220, the collimating device 300, the fly-eye lens 100 and the focusing lens 400. The frame 500 includes a first cavity 510 and a second cavity 520 penetrating in the optical axis direction of the fly-eye lens 100, the inner wall of the first cavity 510 is fitted to the peripheries of the collimating device 300 and the fly-eye lens 100, the inner wall of the second cavity 520 is fitted to the periphery of the focusing mirror 400, and the open end of the first cavity 510 away from the second cavity 520 is butted to the substrate 210.

In one embodiment, the corners of the sidewalls of the first chamber 510 are provided with female screw holes, and correspondingly, the base plate 210 is provided with through holes, and the base plate 210 and the frame 500 are locked by using a screw or the like.

With continued reference to fig. 24, based on the above-mentioned frame 500 structure, the fly-eye lens 100 is assembled in the first cavity 510 through a fixing ring 600, and the fixing ring 600 is installed at one end of the first cavity 510 close to the light source 200, for pressing the fly-eye lens 100 in the first cavity 510. The focusing mirror 400 is assembled in the second cavity 520 through a pressing ring 700, and the pressing ring 700 is installed at one end of the second cavity 520 away from the light source 200, that is, is disposed at the periphery of a light exit surface of the focusing mirror 400, and cooperates with the light exit surface to structurally define a light exit port of the illumination system. In addition, after the frame 500 is connected to the substrate 210, a certain gap exists between the surface of the fixing ring 600 facing the second plate 330 and the second plate 330, so as to avoid pressing the second plate 330.

Further, the first cavity 510, the fixing ring 600, the first plate 310 and the second plate 330 of the collimating device 300 have polygonal outlines in the direction perpendicular to the optical axis, and the second cavity 520 and the focusing mirror 400 have circular outlines in the direction perpendicular to the optical axis, so that one end of the first cavity 510 close to the second cavity 520 forms an annular step surface 511 with a circular inner edge and a polygonal outer edge, and the fixing ring 600 is locked with the step surface 511 through a connecting member to limit the fly-eye lens 100 between the fixing ring 600 and the step surface 511.

Specifically, with continued reference to fig. 24, a second mounting post 610 is provided at a corner of the fixing ring 600 on the side facing the fly-eye lens 100, a second mounting hole 512 is provided correspondingly to the step surface 511, the fly-eye lens 100 is mounted on the edge of the fixing ring 600, the second mounting post 610 and the second mounting hole 512 are passed through by a connector such as a screw, and the periphery of the face of the fly-eye lens 100 facing the focusing mirror 400 is brought into contact with the step surface 511, thereby fixing the fly-eye lens 100. In addition, a through groove 130 extending along the optical axis direction is provided at a corner of the fly-eye lens 100, the through groove 130 is fitted to the second mounting post 610, and after the fixing ring 600 is coupled to the step surface 511, the second mounting post 610 is fitted into the through groove 130, so that the fly-eye lens 100 can be laterally restricted.

Referring to fig. 29, in another embodiment of the present invention, in order to facilitate the installation of the focusing mirror 400, an annular groove 521 having a cross-sectional shape of L is disposed at an opening end of the second cavity 520 of the frame 500 away from the first cavity 510, a bottom surface of the annular groove 521 is an annular plane 522, accordingly, a flange 410 is disposed around the light emitting surface of the focusing mirror 400, the bottom surface of the flange 410 abuts against the annular plane 522, and a side surface of the flange 410 is close to a side surface 523 of the annular groove 521. Further, the outer wall of the second cavity 520 is provided with an external thread at a position corresponding to the ring groove 521, and the inner wall of the pressing ring 700 is provided with an internal thread which is connected with the external thread in a matching manner, so that the focusing mirror 400 is fixed.

In the optical system, the first plate 310 is fixed on the substrate 210 by a connector, so that the first plate 310 and the substrate 210 are fixed; the fixing ring 600 is locked with the step surface of the first cavity 510 through a connecting piece, the fly-eye lens 100 is limited between the fixing ring 600 and the step surface 511, the focusing mirror 400 is fixed to the second cavity 520 through a pressing ring 521, and the fixation of the fly-eye lens 100, the focusing mirror 400 and the frame 500 is realized; the frame 500 is locked with the base plate 210 so that the fixing ring 600 can press the first plate 310, thereby fixing the second plate 330.

Therefore, the structure of each element is fully utilized to realize the assembly of the optical device, the whole optical system has a compact structure, is convenient to assemble, has smaller volume, can control the size in the optical axis direction in a smaller range, is favorable for the miniaturization of the optical system, and is particularly suitable for the condition of limited use space.

In addition, the second plate body 330 and the first plate body 310 are transversely positioned through the first mounting column 312 and the first notch 331, the first positioning column 313 and the second notch 332, and the first plate body 310 and the substrate 210 are connected through the connecting piece, so that transverse alignment of the first lens 320, the second lens 340 and the LED lamp bead 220 is realized; the fly-eye lens 100 is installed in the first cavity 510 through a connecting piece, the focusing mirror 400 is fixed in the second cavity 520 through the ring groove 521 and the pressing ring 700, the whole frame 500 is locked with the substrate 210 through the connecting piece, and transverse alignment of the fly-eye lens 100, the focusing mirror 400 and the LED lamp bead 220 is achieved. Furthermore, the assembly errors of the optical elements in the transverse direction are accumulated to be small, the transverse positioning precision is high, and further, the better spot shape and uniformity can be obtained.

Referring to fig. 24, in an embodiment, a sealing ring 800 is further disposed on the substrate 210, and the sealing ring 800 is disposed along a periphery of the front surface of the substrate 210 and is in press fit with an end surface of the frame 500, so as to prevent moisture from entering into the frame 500 and affecting a service life of the LED lamp bead 220.

Referring to fig. 23 and 24, in one embodiment, a connection block 900 is further provided at the edge of the substrate 210 for connecting the terminals on the substrate 210 with an external circuit. Preferably, the connection block 900 is provided in two, respectively, on opposite sides of the base plate 210.

In combination with the structure of the sealing ring 800, the connecting block 900 is disposed outside the sealing ring 800, and in order to control the size of the substrate 210, the sealing ring 800 is provided with a third notch 810 at a position corresponding to the connecting block 900 so as to avoid the connecting block 900.

In combination with the arrangement of the sealing ring 800 and the connecting block 900, the sidewall of the first cavity 510 of the frame 500 is provided with a clearance groove 513 corresponding to the connecting block 900. Meanwhile, for convenience of processing and assembly, the end surface of the sidewall of the first cavity 510, on which the clearance 513 is disposed, and the surface of the sealing ring 800 are pressed together, and the sidewall, on which the clearance 513 is not disposed, may further extend toward the back surface of the substrate 210 to cover the side surface of the sealing ring 800 and at least a portion of the side surface of the substrate 210.

Further, the first cavity 510 extends outward toward the open end of the substrate 210 to form an outer edge 514, the peripheral shape of the outer edge 514 is matched with the peripheral shape of the substrate 210, a second positioning column is disposed on the bottom surface of the outer edge 514, and a positioning hole is correspondingly disposed on the sealing ring 800 to realize the positioning of the sealing ring 800.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. A fly-eye lens (100), comprising a light-transmitting plate (110), wherein the light-transmitting plate (110) has two light-transmitting surfaces (111) arranged oppositely, each light-transmitting surface (111) is provided with a micro-lens group (120), and the micro-lens group (120) comprises a plurality of micro-lenses (121), characterized in that:

adjacent microlenses (121) abut;

the distribution of the central positions of the plurality of microlenses (121) follows a polar equation:

taking the central position of the micro lens group (120) as the pole of a polar coordinate system, wherein:

r is the radius of the microlens group (120);

n is the number of microlenses (121) included in one microlens set (120), and N is a positive integer;

i＝1,2,3......；

r (i) is the polar diameter of the center of the ith microlens (121) in a polar coordinate system;

θ (i) a polar angle of the center of the ith microlens (121) in the polar coordinate system;

INT is an integer function;

x is a positive number.

2. Fly-eye lens (100) according to claim 1, wherein: and X is any one of 0.5, 2, 2.5, 2.6 and 3.

3. Fly-eye lens (100) according to claim 1, wherein: the surface of each microlens (121) in each microlens group (120) is spherical, the spherical curvature radius of each microlens (121) is the same, the spherical curvature radius is 3mm-7mm, and the height of the spherical vertex of each microlens (121) relative to the light passing surface (111) is 0.2mm-0.7 mm;

the micro lenses (121) on the two light passing surfaces (111) are arranged in a pair mode along the same optical axis, and the distance between the spherical vertexes of the two micro lenses (121) arranged along the same optical axis is equal to the focal length of the micro lenses (121).

4. A fly-eye lens (100) according to claim 3, wherein: the edge shapes of the micro lenses (121) comprise at least three of quadrangle, pentagon, hexagon, heptagon and octagon, and in the micro lenses (121) with the same number of sides, at least part of the micro lenses (121) have different areas and/or different edge orientations.

5. Fly-eye lens (100) according to any of claims 1 to 4, wherein: dividing the microlens group (120) into at least a central region (S0), a first region (S1), and a second region (S2) in this order from the center thereof in the radial direction thereof;

the first area (S1) is distributed with micro lenses (121) with a first dominant surface type, the second area (S2) is distributed with micro lenses (121) with a second dominant surface type, the first dominant surface type and the second dominant surface type are different and are respectively selected from one or two of spherical surfaces with edges in quadrilateral, pentagonal, hexagonal and heptagonal shapes; and is

Within the first region (S1), the microlenses (121) are arranged along a plurality of first vortex lines (L1);

within the second region (S2), the microlenses (121) are arranged along a plurality of second vortexes (L2);

wherein the first vortex line (L1) extends in a clockwise direction from an end thereof near the central region (S0), and the second vortex line (L2) extends in a counterclockwise direction from an end thereof near the first region (S1).

6. An illumination system, comprising:

a light source (200);

-collimating means (300) for converting light emitted by said light source (200) into collimated light;

fly-eye lens (100) according to any of claims 1 to 5, for beam splitting focusing of the collimated light by its micro-lenses (121); and

and the focusing lens (400) is positioned on the output optical path of the fly-eye lens (100) and is used for converging and outputting the light output by the fly-eye lens (100) so as to obtain uniform light spots at the light outlet.

7. The lighting system of claim 6, wherein the light source (200) comprises a substrate (210) and a plurality of LED beads (220) disposed on the substrate (210);

the collimating device (300) comprises a first plate body (310), a plurality of first lenses (320), a second plate body (330) and a plurality of second lenses (340);

the LED lamp comprises a first plate body (310), a plurality of through holes (311) are formed in the first plate body (310) corresponding to the LED lamp beads (220), each first lens (320) is correspondingly embedded into the through hole (311), the second plate body (330) covers each through hole (311) and is provided with one second lens (340) corresponding to each through hole (311), and the LED lamp beads, the first lenses and the second lenses are arranged on the same optical axis.

8. The illumination system of claim 7, further comprising:

frame (500), include in the optical axis direction of fly-eye lens (100) link up first cavity (510) and second cavity (520) that set up, the inner wall of first cavity (510) with collimating device (300) with fly-eye lens (100) adaptation, the inner wall of second cavity (520) with focusing mirror (400) adaptation, keep away from in first cavity (510) the one end of second cavity (520) with base plate (210) sealing connection.

9. The illumination system of claim 8, wherein the illumination system further comprises:

a fixing ring (600) connected to one end of the first cavity (510) near the light source (200);

the pressing ring (700) is connected to one end, far away from the light source (200), of the second cavity (520) and used for fixing the focusing mirror (400);

the outlines of the first cavity (510) and the fixed ring (600) in the direction perpendicular to the optical axis are polygonal, the outline of the second cavity (520) in the direction perpendicular to the optical axis is circular, and one end, close to the second cavity (520), of the first cavity (510) forms an annular step surface (511);

the fixing ring (600) is fixedly connected with the step surface (511) so as to limit the fly-eye lens (100) between the fixing ring (600) and the step surface (511).

10. The lighting system of claim 9, wherein the first board body (310) is provided with a first mounting post (312), the second board body (330) is provided with a first notch (331) corresponding to the first mounting post (312), the first board body (310) is fixedly connected with the base plate (210) through the first mounting post (312) by a connecting piece, and the second board body (330) is fixedly connected with the first board body (310);

retainer plate (600) are equipped with second erection column (610), the side of fly-eye lens (100) is equipped with logical groove (130) that extend along the optical axis direction, retainer plate (600) pass through the connecting piece second erection column (610) with step face (511) lock with, just second erection column (610) embedding lead to groove (130).

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