Lens array and lighting device

Abstract

The invention discloses a lens array and a lighting device.The lens array is arranged on a substrate and comprises a first lens set, a second lens set and a third lens set which are sequentially arranged in the width direction of the substrate. Each of the first lens group and the third lens group comprises a plurality of first lenses which are arranged in a row along the length direction of the substrate, the light emitting side of each first lens is provided with a first convex part, the outer wall of each first convex part is provided with a first scale surface, and the light incident side of each first lens is provided with a first light incident groove; the second lens group comprises a plurality of second lenses which are arranged in rows along the length direction of the substrate, the light incident side of each second lens is provided with a second convex part, the light emergent side of each second lens is provided with a second light incident groove, and the groove bottom of each second light incident groove is provided with a second scale surface. The lens array is applied to a lighting device of a large goods shelf aisle and can provide enough illumination intensity for goods shelves on the two sides of the aisle.

Description

Technical Field

[0001] The present invention relates to the technical field of lamp lenses, and in particular to a lens array and a lighting device. Background Art

[0002] LED has the advantages of low power consumption, high efficiency, and long life. It is widely used as a light source in lighting equipment. The divergence angle of LED lamp beads is relatively large, and the light energy of LED lamp beads is strongest at the center. The larger the angle, the weaker the light intensity. Therefore, an optical lens needs to be set in the lighting device to change the angle of light emission. In narrow and long areas such as large shelf aisles, the existing lighting devices have a small light emission angle, resulting in the lighting devices being unable to provide sufficient lighting for the shelves on both sides of the aisle. The existing lighting devices have poor lighting effects in narrow and long areas and cannot meet application requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a lens array to optimize the lighting effect of the lighting device in a narrow and long area.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: the present invention provides a lens array, which is arranged on a substrate, and the lens array includes a first lens group, a second lens group and a third lens group arranged in sequence along the width direction of the substrate, the first lens group and the third lens group both include a plurality of first lenses arranged in a row along the length direction of the substrate, a first protrusion is provided on the light emitting side of the first lens, a first scale surface is provided on the outer wall of the first protrusion, and a first light entrance groove is provided on the light entrance side of the first lens; the second lens group includes a plurality of second lenses arranged in a row along the length direction of the substrate, a second protrusion is provided on the light entrance side of the second lens, a second light entrance groove is provided on the light emitting side of the second lens, and a second scale surface is provided at the bottom of the second light entrance groove.

[0005] Furthermore, an outer contour of a cross section of the first protrusion along the thickness direction of the substrate is in an elliptical shape, and an outer contour of a cross section of the second protrusion along the thickness direction of the substrate is in an elliptical shape.

[0006] Furthermore, the long axis direction of the first protrusion and the long axis direction of the second protrusion are both arranged along the length direction of the substrate.

[0007] Furthermore, the first light entrance groove and the second light entrance groove each include two oppositely disposed groove walls, the groove walls include a straight edge and a curved edge connected to the straight edge end to end, the curved edges of the two groove walls are connected by an arc-shaped groove bottom surface, the arc-shaped groove bottom surface is provided with an arc-shaped protrusion along its length direction, and the arc-shaped groove bottom surface of the second light entrance groove is the second scale surface.

[0008] Furthermore, there is a gap between the protruding portions of two adjacent first lenses.

[0009] Furthermore, the substrate is provided with a strip-shaped groove corresponding to the second lens group, and the second light entrance groove is provided at the bottom of the strip-shaped groove.

[0010] Furthermore, a plurality of first spacers and second spacers corresponding to the plurality of first spacers are provided on the light emitting side of the substrate, the first spacers and the second spacers corresponding thereto are arranged opposite to each other and enclose to form an accommodating groove, the first lens group, the second lens group and the third lens group are all arranged in the accommodating groove, and a first emitting surface is provided on the first spacers and the second spacers.

[0011] Furthermore, in two adjacent accommodating grooves, the first spacer of one accommodating groove is connected to the second spacer of the other accommodating groove, the light incident side of the substrate corresponds to the first spacer and is provided with a plurality of first grooves along its length direction, and the light incident side of the substrate corresponds to the second spacer and is provided with a plurality of second grooves along its length direction; in the first spacer and the second spacer connected to the spacer, the first groove is connected to the second groove to enclose and form a spacer groove.

[0012] Another object of the present invention is to provide a lighting device comprising the above-mentioned lens array.

[0013] Furthermore, the lighting device also includes a lighting panel, on which a first lamp bead is provided corresponding to each first lens, and on which at least two second lamp beads are provided corresponding to each second lens.

[0014] The beneficial effects of the present invention are as follows: the lens array provided by the present invention can output light with high uniformity and large light output angle through the first lens group and the third lens group, and a second lens group is arranged between the first lens group and the third lens group, and light with high light intensity is output through the second lens group. The lens array can ensure that the lighting device has a large light output angle, high uniformity and high light intensity, especially when the lens array is applied to the lighting device of large shelf aisles, it can provide sufficient light intensity for the shelves on both sides of the aisle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a lens array provided by the present invention at a viewing angle in one embodiment;

[0016] Figure 2 for Figure 1 The schematic diagram of the structure of the lens array shown in another viewing angle;

[0017] Figure 3 for Figure 1 A cross-sectional view of the lens array shown;

[0018] Figure 4 A schematic diagram of the structure of an illuminating device provided by the present invention in one embodiment;

[0019] Figure 5 for Figure 4 A magnified view of the structure of part A;

[0020] Figure 6 The schematic diagram of the cross-sectional optical path of the first lens / the second lens along the short axis direction is schematically shown;

[0021] Figure 7 for Figure 1 Schematic diagram of the optical path of the first lens along its short axis direction;

[0022] Figure 8 for Figure 1 Schematic diagram of the optical path of the first lens along its long axis;

[0023] Fig. 9 for Figure 1 Schematic diagram of the optical path of the second lens along its short axis;

[0024] Fig.10 for Figure 1 Schematic diagram of the optical path of the second lens along its long axis;

[0025] Fig.11 For application Figure 1 A schematic diagram of a light spot of an illumination device of a lens array shown;

[0026] Fig.12 For application Figure 1 False color image of the illumination setup with the lens array shown.

[0027] Description of labels:

[0028] 1. Substrate; 2. First protrusion; 3. First surface; 4. First light entrance groove; 5. Second protrusion; 6. Second light entrance groove; 7. Second surface; 8. Groove wall; 9. Straight edge; 10. Curved edge; 11. Arc groove bottom; 12. Arc protrusion; 13. Strip groove; 14. First spacer; 15. Second spacer; 16. Accommodating groove; 17. First emitting surface; 18. First groove; 19. Second groove; 20. Spacer groove; 21. Lighting panel; 22. First lamp bead; 23. Second lamp bead; 24. Gap. DETAILED DESCRIPTION

[0029] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in combination with the implementation modes and the accompanying drawings.

[0030] Please refer to Figures 1 to 12 The present invention provides a lens array, which is arranged on a substrate 1. The lens array includes a first lens group, a second lens group and a third lens group which are arranged in sequence along the width direction of the substrate 1. The first lens group and the third lens group both include a plurality of first lenses arranged in a row along the length direction of the substrate 1. A first protrusion 2 is provided on the light emitting side of the first lens, a first scale surface 3 is provided on the outer wall of the first protrusion 2, and a first light entrance groove 4 is provided on the light entrance side of the first lens; the second lens group includes a plurality of second lenses arranged in a row along the length direction of the substrate 1, a second protrusion 5 is provided on the light entrance side of the second lens, a second light entrance groove 6 is provided on the light emitting side of the second lens, and a second scale surface 7 is provided at the bottom of the second light entrance groove 6.

[0031] From the above description, it can be seen that the beneficial effect of the present invention lies in that the lens array provided by the present invention can output light with high uniformity and large light output angle through the first lens group and the third lens group, and a second lens group is arranged between the first lens group and the third lens group, and light with high light intensity is output through the second lens group. The lens array can ensure that the lighting device has a large light output angle, high uniformity and high light intensity, especially when the lens array is applied to the lighting device of large shelf aisles, it can provide sufficient light intensity for the shelves on both sides of the aisle.

[0032] Furthermore, the outer contour of the cross section of the first protrusion 2 along the thickness direction of the substrate 1 is in an elliptical shape, and the outer contour of the cross section of the second protrusion 5 along the thickness direction of the substrate 1 is in an elliptical shape.

[0033] From the above description, it can be seen that the light emitting parts of the first lens and the second lens are both elliptical, and the lighting device applied to the narrow and long area can output a long light spot, increase the length area of ​​the lighting device, and meet the lighting needs of the narrow and long area.

[0034] Furthermore, the long axis direction of the first protrusion 2 and the long axis direction of the second protrusion 5 are both arranged along the length direction of the substrate 1 .

[0035] Furthermore, the first light entrance groove 4 and the second light entrance groove 6 each include two oppositely disposed groove walls 8, the groove wall 8 including a straight edge 9 and a curved edge 10 connected end to end with the straight edge 9, the curved edges 10 of the two groove walls 8 are connected by an arcuate groove bottom surface 11, the arcuate groove bottom surface 11 is provided with an arcuate protrusion 12 along its length direction, and the arcuate groove bottom surface 11 of the second light entrance groove 6 is the second scale surface 7.

[0036] From the above description, it can be seen that the structure of the first light entrance slot 4 and the second light entrance slot 6 can improve the utilization rate and controllability of light. Figure 6 , Figure 7 and Fig. 9 The groove wall of the first light entrance groove and the groove wall of the second light entrance groove respectively form the first incident surface of the first lens and the second incident surface of the second lens, the first groove 18 and the second groove 19 can both form the reflection surfaces of the first lens and the second lens, and the first protrusion / the second protrusion form the second exit surface of the first lens / the second lens; wherein, the LED lamp bead is arranged in the light entrance groove as a light source, and the light entering the lens from the first incident surface will be refracted to the reflection surface, and the reflection surface will reflect the light to the first exit surface, and the light will be refracted into the air through the first exit surface; the light entering the lens from the second incident surface will be refracted into the air. The structure of the first light entrance groove and the second light entrance groove can improve the utilization rate of the luminous flux and improve the light efficiency of the lighting device using the lens array.

[0037] Furthermore, there is a gap 24 between the protruding portions of two adjacent first lenses.

[0038] From the above description, it can be seen that setting a gap between the protrusions of two adjacent first lenses can increase the area of ​​the first protrusion of the first lens and increase the light output area of ​​the first lens, so as to improve the light efficiency of the lighting device using the lens array.

[0039] Furthermore, the substrate 1 is provided with a strip groove 13 corresponding to the second lens group, and the second light entrance groove 6 is provided at the bottom of the strip groove 13 .

[0040] It can be seen from the above description that the structure of the strip groove 13 can reduce the interference between the first lens and the second lens, improve the light control effect of the lens array, and enhance the light efficiency of the lighting device using the lens array.

[0041] Furthermore, a plurality of first spacers 14 and second spacers 15 corresponding to the plurality of first spacers 14 are provided on the light emitting side of the substrate 1, the first spacers 14 and the corresponding second spacers 15 are arranged opposite to each other and enclose to form a receiving groove 16, the first lens group, the second lens group and the third lens group are all arranged in the receiving groove 16, and a first emitting surface 17 is provided on the first spacers 14 and the second spacers 15.

[0042] From the above description, it can be seen that the first exit surface 17 of the first spacer 14 and the second spacer 15 can reduce the yellow spot effect of the lens array. Preferably, the first exit surface 17 is inclined 34 to 40° relative to the horizontal direction so that the lens array can obtain a better light output effect.

[0043] Furthermore, in two adjacent accommodating grooves 16, the first spacer 14 of one accommodating groove 16 is connected to the second spacer 15 of the other accommodating groove 16, and the light incident side of the substrate 1 is provided with a plurality of first grooves 18 along its length direction corresponding to the first spacer 14, and the light incident side of the substrate 1 is provided with a plurality of second grooves 19 along its length direction corresponding to the second spacer 15; in the first spacer 14 and the second spacer 15 connected to the spacer, the first groove 18 is connected to the second groove 19 to enclose a spacer groove 20.

[0044] From the above description, it can be known that the first lens and the second lens can form a reflective surface through the groove wall of the first groove and the second groove, and the light can enter the lens from the groove wall, and then the light entering the lens is reflected by the reflective surface formed by the first groove / the second groove to the first exit surface of the first spacer / the second spacer, and refracted into the air through the first exit surface. On the one hand, the first groove and the second groove can avoid interference between the first lens and the second lens; on the other hand, the first groove and the second groove can improve the light utilization rate of the lens and correspondingly improve the light control effect of the lens.

[0045] Another object of the present invention is to provide a lighting device comprising the above-mentioned lens array.

[0046] It can be seen from the above description that the lighting device has at least all the beneficial effects of the above lens array.

[0047] Furthermore, the lighting device further comprises a lighting panel 21 , on which a first lamp bead 22 is provided corresponding to each first lens, and on which at least two second lamp beads 23 are provided corresponding to each second lens.

[0048] It can be seen from the above description that providing at least two second lamp beads 23 corresponding to each second lens can further ensure the light intensity of the lighting device.

[0049] Embodiment 1

[0050] Please refer to Figures 1 to 12, Embodiment 1 of the present invention is: providing a lens array, which is arranged on a substrate 1, wherein the lens array includes a first lens group, a second lens group and a third lens group arranged in sequence along the width direction of the substrate 1, the first lens group and the third lens group both include a plurality of first lenses arranged in a row along the length direction of the substrate 1, a first protrusion 2 is provided on the light emitting side of the first lens, a first scale surface 3 is provided on the outer wall of the first protrusion 2, and a first light entrance groove 4 is provided on the light entrance side of the first lens; the second lens group includes a plurality of second lenses arranged in a row along the length direction of the substrate 1, a second protrusion 5 is provided on the light entrance side of the second lens, a second light entrance groove 6 is provided on the light emitting side of the second lens, and a second scale surface 7 is provided at the bottom of the second light entrance groove 6.

[0051] The lens array designed in this embodiment can be applied to lighting devices to illuminate narrow and long areas such as shelf aisles. Figure 1 In order to make the light output of the lighting device meet the characteristics of long and narrow areas with large length and small width, the first protrusion 2 of the first lens and the second protrusion of the second lens in the lens array are both set to elliptical shapes, so that the lighting device can project a light plate with large length and small width through the lens array, thereby meeting the lighting needs of the long and narrow areas. In detail, the long axis direction of the first protrusion 2 and the long axis direction of the second protrusion 5 are both set along the length direction of the substrate 1.

[0052] Please refer to Figures 4 to 5 The lighting device may be provided with a lighting panel 21, and a first lamp bead 22 is provided on the lighting panel 21 corresponding to each first lens, so as to output light with high uniformity and large light output angle through the first lens, and two second lamp beads 23 are provided on the lighting panel 21 corresponding to each second lens, so as to output light with high light intensity through the second lens group. The lens array can ensure that the lighting device has a large light output angle, high uniformity and high light intensity, especially when the lens array is applied to the lighting device of the large shelf aisle, it can provide sufficient light intensity for the shelves on both sides of the aisle.

[0053] In this embodiment, the first light entrance groove 4 and the second light entrance groove 6 each include two oppositely disposed groove walls 8, the groove wall 8 includes a straight edge 9 and a curved edge 10 connected end to end with the straight edge 9, the curved edges 10 of the two groove walls 8 are connected by an arcuate groove bottom surface 11, and the arcuate groove bottom surface 11 is provided with an arcuate protrusion 12 along its length direction, and the arcuate groove bottom surface 11 of the second light entrance groove 6 is a second scale surface 7.

[0054] Please refer to Figure 1 It can be seen that in this embodiment, there is a gap 24 between the raised portions of two adjacent first lenses, so that the first facet on the first lens can better improve the uniformity of light. When the lens array is applied to shelf aisles, light can be evenly projected onto the shelves on both sides of the aisle.

[0055] Please refer to Figure 3 The substrate 1 is provided with a strip groove 13 corresponding to the second lens group, and the bottom of the strip groove 13 is provided with the second light entrance groove 6.

[0056] Please combine Figure 1 and Figure 3 For reference, the light-emitting side of the substrate 1 is provided with a plurality of first spacers 14 and second spacers 15 which are arranged one-to-one corresponding to the plurality of first spacers 14 , the first spacers 14 and the corresponding second spacers 15 are arranged opposite to each other and enclose to form a receiving groove 16, the first lens group, the second lens group and the third lens group are all arranged in the receiving groove 16, and the first spacers 14 and the second spacers 15 are both provided with a first emitting surface 17.

[0057] In detail, in two adjacent accommodating grooves 16, the first spacer 14 of one accommodating groove 16 is connected to the second spacer 15 of the other accommodating groove 16, and the light incident side of the substrate 1 is provided with a plurality of first grooves 18 along its length direction corresponding to the first spacer 14, and the light incident side of the substrate 1 is provided with a plurality of second grooves 19 along its length direction corresponding to the second spacer 15; in the first spacer 14 and the second spacer 15 connected to the spacer, the first groove 18 is connected to the second groove 19 to enclose a spacer groove 20.

[0058] like Figure 7 As shown, the groove wall of the first light entrance groove 4 forms the first incident surface of the first lens, the arc groove bottom surface of the first light entrance groove 4 forms the second incident surface of the first lens, the groove wall of the first groove 18 corresponding to the first lens and the groove wall of the second groove corresponding to the first lens both form the reflection surface of the first lens, and the first protrusion 2 forms the second exit surface of the first lens; Fig. 9 As shown, the groove wall of the second light-entering groove 6 forms the second incident surface of the second lens, the arc-shaped groove bottom surface of the second light-entering groove 6 forms the second incident surface of the second lens, the groove wall of the first groove 18 corresponding to the second lens and the groove wall of the second groove 19 corresponding to the second lens both form the reflection surface of the second lens, and the second protrusion 5 forms the second exit surface of the second lens. Therefore, in this embodiment, the first lens and the second lens both include a first incident surface, a second incident surface, a reflection surface, a first exit surface, and a second exit surface.

[0059] Specifically, refer to Figure 7 or Fig. 9In a lens of the present embodiment, the light entering the lens from the first incident surface will be refracted by the first incident surface to the reflective surface, and the reflective surface will then reflect the light to the first exit surface, and the first exit surface will then refract the part of the light to the air; the light entering the lens from the second incident surface will be refracted by the second incident surface to the second exit surface, and the second exit surface will then refract the light to the air. The light entrance groove of the first lens and the light entrance groove of the second lens designed in the present embodiment are both provided with groove walls, and the groove walls are inclined relative to the vertical direction, and the groove walls can accurately refract the light to the reflective surface; the light entrance groove of the first lens and the light entrance groove of the second lens are both provided with an arc groove bottom surface 11, and an arc protrusion 12 is provided on the arc groove bottom surface 11, and the arc groove bottom surface 11 can accurately refract the light to the second exit surface. The first lens and the second lens in the lens array of the present embodiment have high controllability and high utilization rate for the light, and the lighting device using the lens array has good light efficiency.

[0060] For more details, please refer to Figure 6 , the light will be refracted for the first time at the wall of the light entrance groove, and the light will enter the optically dense medium (lens) from the optically sparse medium (air), and then the light will reach the reflection surface formed by the first groove 18 / the second groove, generating total reflection light, and the reflection surface will reflect the light to the first exit surface, and the light will be emitted from the optically dense medium to the optically sparse medium. According to the law of refraction, Sin I1 / Sin I2=n, where A1 is the incident angle, A2 is the refraction angle, and n is the refractive index; and when the refraction angle reaches 90°, the corresponding incident angle is the critical angle C, and Sin C=1 / n.

[0061] In this embodiment, the lens array can be specifically made of a material with a refractive index of 1.67. In order to ensure the light utilization rate of the lens and to ensure that the emitted light ρ1 can meet the use requirements, so that the light of the lens array can have the characteristics of large light output angle and high uniformity, this embodiment will preset the emission angle A3 of the emitted light ρ1 to be not less than 28°, and the inclination angle of the first incident surface relative to the horizontal direction is set to 66°. The optical path is reversely calculated, and the inclination angle of the first emission surface relative to the horizontal direction is not greater than 40°. Preferably, in this embodiment, the inclination angle A4 of the first emission surface relative to the horizontal direction can be set to 34-40°.

[0062] In summary, the lens array provided by the present invention can output light with high uniformity and a large light output angle through the first lens group and the third lens group, and a second lens group is arranged between the first lens group and the third lens group, and light with high light intensity is output through the second lens group. The lens array can ensure that the lighting device has a large light output angle, high uniformity and high light intensity. In particular, when the lens array is applied to the lighting device of large shelf aisles, sufficient light intensity can be provided to the shelves on both sides of the aisle.

[0063] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A lens array, wherein the lens array is arranged on a substrate, characterized in that: The invention comprises a first lens group, a second lens group and a third lens group which are sequentially arranged along the width direction of the substrate, wherein the first lens group and the third lens group both comprise a plurality of first lenses which are arranged in a row along the length direction of the substrate, a first protrusion is provided on the light exiting side of the first lens, a first scale surface is provided on the outer wall of the first protrusion, and a first light entrance groove is provided on the light entrance side of the first lens; the second lens group comprises a plurality of second lenses which are arranged in a row along the length direction of the substrate, a second protrusion is provided on the light entrance side of the second lens, a second light entrance groove is provided on the light exiting side of the second lens, and a second scale surface is provided at the bottom of the second light entrance groove.

2. The lens array according to claim 1, characterized in that: The outer contour of the cross section of the first protrusion along the thickness direction of the substrate is in an elliptical shape, and the outer contour of the cross section of the second protrusion along the thickness direction of the substrate is in an elliptical shape.

3. The lens array according to claim 2, characterized in that: The long axis direction of the first protrusion and the long axis direction of the second protrusion are both arranged along the length direction of the substrate.

4. The lens array according to claim 1, characterized in that: The first light entrance groove and the second light entrance groove each include two oppositely disposed groove walls, wherein the groove walls include a straight edge and a curved edge connected end to end with the straight edge, the curved edges of the two groove walls are connected by an arc-shaped groove bottom surface, the arc-shaped groove bottom surface is provided with an arc-shaped protrusion along its length direction, and the arc-shaped groove bottom surface of the second light entrance groove is the second scale surface.

5. The lens array according to claim 1, characterized in that: There is a gap between the convex portions of two adjacent first lenses.

6. The lens array according to claim 1, characterized in that: The substrate is provided with a strip-shaped groove corresponding to the second lens group, and the second light incident groove is provided at the bottom of the strip-shaped groove.

7. The lens array according to claim 1, characterized in that: A plurality of first spacers and second spacers corresponding to the plurality of first spacers are provided on the light emitting side of the substrate, the first spacers and the corresponding second spacers are arranged opposite to each other and enclose to form an accommodating groove, the first lens group, the second lens group and the third lens group are all arranged in the accommodating groove, and a first emitting surface is provided on the first spacers and the second spacers.

8. The lens array according to claim 7, characterized in that: In two adjacent accommodating grooves, the first spacer of one accommodating groove is connected to the second spacer of the other accommodating groove, and the light incident side of the substrate corresponds to the first spacer and is provided with a plurality of first grooves along its length direction, and the light incident side of the substrate corresponds to the second spacer and is provided with a plurality of second grooves along its length direction; in the first spacer and the second spacer connected to the spacer, the first groove is communicated with the second groove to enclose and form a spacer groove.

9. A lighting device, characterized in that: A lens array comprising any one of claims 1 to 8.

10. The lighting device according to claim 9, characterized in that: It also includes a lighting panel, on which a first lamp bead is provided corresponding to each first lens, and on which at least two second lamp beads are provided corresponding to each second lens.

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