Optical lens and lamp using the same

Abstract

The present invention relates to a lens and a lamp, in particular to an optical lens and a lamp using the lens, wherein the optical lens has an optical axis, a bottom surface, a light-entering free-form surface, and a light-emitting free-form surface, wherein the space enclosed by the light-entering free-form surface forms an accommodating space; the light-entering free-form surface is a rotational surface, wherein the rotation axis of the rotational surface is coaxial with the central axis of the optical axis; the light-emitting free-form surface has a first symmetric plane and a second symmetric plane, wherein the cross section of the light-emitting free-form surface at the position of the first symmetric plane forms two first curves, and the cross section of the light-emitting free-form surface at the position of the second symmetric plane forms two second curves. By providing light-entering free-form surfaces and light-emitting free-form surfaces of specific shapes, the light distribution can be changed, the illumination uniformity of the planting area can be improved, the uniform production of plants can be ensured, and the quality of plants can be improved. At the same time, light waste can be avoided, and the light utilization rate is relatively high.

Description

Technical Field

[0001] This invention relates to a lens and a lamp, and more particularly to an optical lens and a lamp employing the lens. Background Technology

[0002] Plant growth depends on light. In order to promote plant growth, more and more companies are using lighting to increase the light exposure time of plants. LEDs have become the preferred light source for plant lighting due to their advantages such as high efficiency, long life, small size, controllable spectrum, and ability to illuminate at close range.

[0003] Currently, most companies directly use LED lights to illuminate plants. However, LED lights are inorganic solid-state semiconductor devices with obvious light emission directionality. Their light distribution is similar to the Lambertian distribution, which means that the light intensity in the center is stronger than that on both sides, resulting in uneven irradiance. This not only affects the quality of the plants but also has relatively low light utilization.

[0004] In view of this, the inventor has conducted in-depth research on the above-mentioned problems, which led to the present invention. Summary of the Invention

[0005] The purpose of this invention is to provide an optical lens that helps improve plant quality and has a relatively high light utilization rate, and a lamp using the lens.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An optical lens has an optical axis, an annular bottom surface, and an incident freeform surface and an exit freeform surface located on the same side of the bottom surface. The inner periphery of the bottom surface is integrally connected to the outer periphery of the incident freeform surface, and the outer periphery of the bottom surface is directly or indirectly connected to the outer periphery of the exit freeform surface. The space enclosed by the incident freeform surface forms an accommodating space for setting a light source.

[0008] The incident light freeform surface is a surface of revolution, and the axis of revolution of the surface of revolution is arranged coaxially with the optical axis;

[0009] The light-emitting freeform surface has a first symmetry plane and a second symmetry plane arranged perpendicularly to each other. The intersection line between the first symmetry plane and the second symmetry plane is located on the optical axis. The cross section of the light-emitting freeform surface at the position of the first symmetry plane forms two first curves symmetrically arranged with the second symmetry plane as the center. The first curve includes a first line segment, a second line segment, a third line segment, and a fourth line segment connected sequentially from one end located on the second symmetry plane to the other end. The curvature of the first line segment gradually decreases from the end of the first line segment away from the second line segment to the other end. The curvature of the second line segment gradually increases from the end of the second line segment connected to the first line segment to the other end. The curvature of the third line segment gradually increases from the end of the third line segment connected to the second line segment to the other end. The curvature of the fourth line segment gradually decreases from the end of the fourth line segment connected to the third line segment to the other end. The cross section of the light-emitting freeform surface at the position of the second symmetry plane forms a second curve symmetrically arranged with the first symmetry plane as the center. The curvature of the second curve gradually increases and then gradually decreases from its middle position to both ends.

[0010] As an improvement of the present invention, the generatrix of the rotating surface is a curve that gradually approaches the optical axis from one end connected to the bottom surface to the other end, and the curvature of the generatrix of the rotating surface gradually decreases from one end relatively close to the optical axis to the other end.

[0011] As an improvement of the present invention, the plane containing the outer periphery of the incident freeform surface is arranged parallel to the plane containing the outer periphery of the exit freeform surface.

[0012] As an improvement of the present invention, in the same direction, the curvature change rate of the third line segment is greater than that of the second line segment.

[0013] As an improvement of the present invention, the incident light freeform surface is evenly distributed with multiple arc-shaped protrusions.

[0014] As an improvement of the present invention, the arc-shaped protrusion is a spherical protrusion or a non-spherical protrusion.

[0015] A lighting fixture includes an LED lamp and the aforementioned optical lens, wherein the LED lamp is located within the accommodating space of the optical lens.

[0016] As an improvement of the present invention, the LED light is located on the optical axis.

[0017] As an improvement of the present invention, there are multiple LED lights, and each LED light is evenly distributed around the optical axis.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects:

[0019] 1. By setting specific shapes of incident light freeform surfaces and exit light freeform surfaces, the light distribution can be changed, the light uniformity of the planting area can be improved, the uniform production of plants can be ensured, the quality of plants can be improved, and light waste can be avoided, resulting in a relatively high light utilization rate.

[0020] 2. By setting arc-shaped protrusions, it is helpful to improve the consistency and uniformity of the mixed spectrum, ensure the consistency of the absorption ratio of different wavebands of plants, which is conducive to plant-friendly growth and further improves the planting quality.

[0021] 3. The lens and lamp provided by this invention have low manufacturing costs, which helps to enhance the product's competitive advantage. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the lamp's structure in the embodiment;

[0023] Figure 2 This is a schematic diagram of the optical lens structure in the embodiment;

[0024] Figure 3 This is a perspective view of the optical lens structure in the embodiment;

[0025] Figure 4 This is a schematic diagram of the cross-sectional structure of the optical lens in the embodiment. The dashed lines in the figure are virtual lines, mainly used to distinguish different line segments.

[0026] Figure 5 This is a partially enlarged schematic diagram of the incident freeform surface in the embodiment;

[0027] Figure 6 This is a schematic diagram illustrating the curvature variation trend of the generatrix of the surface of revolution in the embodiment.

[0028] Figure 7 This is a schematic diagram illustrating the curvature variation trend of two symmetrically arranged first curves in the embodiment.

[0029] Figure 8 This is a schematic diagram illustrating the curvature change trend of the second curve in the embodiment;

[0030] Figure 9 This is a schematic diagram showing the usage status of the lamps in the embodiment.

[0031] The corresponding markings in the diagram are as follows:

[0032] 10-LED light; 20-Optical lens;

[0033] 21-Bottom surface; 22-Freeform surface incident on light;

[0034] 23-Freeform surface for light emission; 24-Arched protrusion;

[0035] 25 - First curve; 26 - Second curve;

[0036] 31 - First line segment; 32 - Second line segment;

[0037] 33 - Third line segment; 34 - Fourth line segment. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, this embodiment provides a lighting fixture, including an LED lamp 10 and an optical lens 20. The LED lamp 10 is a conventional LED bulb, which can be purchased directly from the market. Furthermore, the optical lens 20 provided in this embodiment can also be used in conjunction with other light sources to form a lighting fixture; that is, this embodiment essentially also provides an optical lens.

[0040] like Figures 2-4 As shown, the optical lens 20 has an optical axis, an annular bottom surface 21, and an incident freeform surface 22 and an exit freeform surface 23 located on the same side of the bottom surface 21. The optical axis is defined the same as in conventional optical systems; when the light beam rotates around the optical axis of the optical lens, there is no change in its optical properties. The annular bottom surface 21 is a surface with a circular hole in the center, and its outer periphery is square. The inner periphery of the bottom surface 21 is integrally connected to the outer periphery of the incident freeform surface 22, and the outer periphery of the bottom surface 21 is directly or indirectly connected to the outer periphery of the exit freeform surface 23. It should be noted that the outer periphery of the incident freeform surface 22 and the outer periphery of the exit freeform surface 23 can both be located on the bottom surface 21. In this embodiment, the plane containing the outer periphery of the incident freeform surface 22 and the plane containing the outer periphery of the exit freeform surface 23 are arranged parallel to each other, i.e., they are not on the same plane. The exit freeform surface 23 is indirectly connected to the bottom surface 21.

[0041] Specifically, the optical lens 20 is integrally injection molded from a transparent material such as epoxy resin, silicone, or glass. It includes a rectangular substrate and a main body integrally connected to the side of the substrate. A groove extending to the main body is formed on the side of the substrate away from the main body. The bottom surface 21 is formed on the side of the substrate away from the main body. The light-incident freeform surface 22 is formed on the inner surface of the groove. The central axis of the groove forms the optical axis. The light-outceasing freeform surface 23 is formed on the outer surface of the main body. In addition, the space enclosed by the light-incident freeform surface (i.e., the groove) forms an accommodating space for setting the light source.

[0042] The LED lamp 10, serving as the light source, is located within the accommodating space of the optical lens 20. To fix the LED lamp 10, a support plate covering the recessed opening can be attached to the bottom surface 21, with the backlight surface of the LED lamp 10 fixedly connected to this support plate. The number of LED lamps 10 can be set according to actual needs. When there is only one LED lamp 10, it is located on the straight line of the optical axis. In this embodiment, there are multiple LED lamps 10, each evenly distributed around the optical axis, ensuring the uniformity of the light source.

[0043] The incident freeform surface 22 is a surface of revolution, with its rotation axis coaxial with the optical axis. The generatrix of this surface of revolution is a curve that gradually approaches the optical axis from one end connected to the bottom surface 21 towards the other end, and the curvature of the generatrix gradually decreases from the end relatively closer to the optical axis towards the other end. Specifically, the cross-sectional curve presented on the radial section of the surface of revolution is equivalent to the curve formed by two symmetrically arranged generatrixes. The curvature of this cross-sectional curve gradually decreases from its midpoint towards both ends. A rectangular coordinate system is established with one end of the cross-sectional curve as the origin, and the x-axis of this rectangular coordinate system lies on the bottom surface 21. The curvature variation trend of the cross-sectional curve is plotted on this rectangular coordinate system as follows: Figure 6 As shown, the curvature change trend function of the above cross-sectional curve is: K1=abs(0.15936*x^2-1.116*x+1.0708) / (1+(0.05312*x^3-0.558*x^2+1.0708*x+0.8071)^2)^1.5.

[0044] Preferred, such as Figure 5 As shown and referenced Figure 3As shown, multiple arc-shaped protrusions 24 protruding towards the light source (i.e., LED lamp 10) are evenly distributed on the incident freeform surface 22, forming a calculus scale structure. The specific distribution structure of the arc-shaped protrusions 24 is as follows: each arc-shaped protrusion 24 is divided into multiple scale groups. Each scale group includes multiple arc-shaped protrusions 24 evenly distributed around the rotation axis of the incident freeform surface 22. Each scale group is arranged sequentially from the rotation axis of the incident freeform surface 22 towards the outer edge of the incident freeform surface 22. Two adjacent scale groups are closely attached, and two adjacent arc-shaped protrusions 24 are also closely attached. The arc-shaped protrusion 24 can be a spherical or aspherical protrusion. In this embodiment, the light emitted by the LED lamp 10 is divided into N equal parts according to the angle. The light corresponding to each part passes through an arc-shaped protrusion 24 of the equidistant calculus scale structure. The width of the arc-shaped protrusion 24 is D, N is defined as 60, the radius R of the arc surface of the arc-shaped protrusion 24 is 0.05-1mm, and the width D of the arc-shaped protrusion 24 ranges from 0.05-0.4mm. Of course, the width of the arc-shaped protrusion 24 gradually increases from the side relatively closer to the optical axis to the other side. In this way, when the light passes through the calculus scale structure, the different colors of light can be mixed well, and a soft light output can be obtained, achieving a consistent mixed spectrum. This can improve spectral uniformity, making it suitable for close-range irradiation of plants, ensuring the consistency of the absorption ratio of different wavelengths of plants, which is conducive to plant-friendly growth and improves planting quality.

[0045] Still Figures 2-4As shown, the light-emitting freeform surface 23 has a first symmetry plane and a second symmetry plane arranged perpendicularly to each other. Both the first and second symmetry planes are virtual surfaces and not part of the light-emitting freeform surface 23. The intersection line between the first and second symmetry planes lies on the optical axis. The cross-section of the light-emitting freeform surface 23 at the position of the first symmetry plane forms two first curves 25 symmetrically arranged around the second symmetry plane. That is, these two first curves 25 are located on opposite sides of the second symmetry plane, symmetrically arranged around the second symmetry plane, and connected to each other. Each first curve 25 includes a first line segment 31, a second line segment 32, a third line segment 33, and a fourth line segment 34 connected sequentially from one end on the second symmetry plane to the other. The curvature of the first line segment 31 gradually decreases from the end away from the second line segment 32 towards the other end; the curvature of the second line segment 32 gradually increases from the end connecting the second line segment 32 and the first line segment 31 towards the other end; and the curvature of the third line segment 33 gradually increases from the end connecting the third line segment 33 and the second line segment 32 towards the other end. The curvature of the fourth line segment 34 gradually increases from the end connecting the fourth line segment 34 and the third line segment 33 to the other end. In the same direction, the rate of change of curvature of the third line segment 33 is greater than that of the second line segment 32. Specifically, a rectangular coordinate system is established with one end of the cross-sectional curve formed by the cross-section of the freeform surface 23 at the first symmetry plane as the origin. The x-axis of this rectangular coordinate system is arranged parallel to the bottom surface 21. The curvature change trend of the cross-sectional curve is plotted on this rectangular coordinate system as follows: Figure 7 As shown, in Figure 7 In the diagram, the area enclosed by the box represents the curvature of the line segment corresponding to the first curve 25. Figure 7 The four boxes from right to left enclose the curvatures corresponding to the first line segment 31, the second line segment 32, the third line segment 33, and the fourth line segment 34, respectively. The curvature trend function of the first curve 25 is: K2=abs(0.0000067984*x^6-0.000407778*x^5+0.009651*x^4-0.11422*x^3+0. .70884*x^2-2.208*x+2.822) / (0.0000009712*x^7-0.000067963*x^6+0.0019 302*x^5-0.028555*x^4+0.23628*x^3-1.104*x^2+2.822*x-3.348)^2+1)^1.5.

[0046] The freeform surface 23, at the position of the second plane of symmetry, forms a second curve 26 symmetrically arranged around the first plane of symmetry. The curvature of the second curve 26 gradually increases and then gradually decreases from its midpoint (the position corresponding to the first plane of symmetry) towards both ends. Specifically, a rectangular coordinate system is established with one end of the second curve 26 as the origin. The x-axis of this rectangular coordinate system is parallel to the bottom surface 21. The curvature trend of the second curve 26 is plotted on this rectangular coordinate system as follows: Figure 8 As shown, its curvature change trend function is: K3=abs(0.013452*x^2-0.19806*x+0.7894) / (1+(0.004484*x^3-0.09903*x^2+0.7894*x-2.234)^2)^1.5.

[0047] The LED lamp 10 has a clear directional light emission, with a Lambertian distribution. This distribution is characterized by a stronger central light intensity than the sides, a beam angle of approximately 120°, and uneven irradiance with a strong central intensity and weaker edges. By placing the LED lamp 10 within the housing of the optical lens 20, the lens 20 can control the light direction, reduce the central light intensity, control the refraction of large-angle light, and bring light beyond the planting area back into the planting area. It also supplements the irradiance at the edges of the planting area, avoiding light waste and improving the uniformity of light in the planting area, which is beneficial for uniform plant growth. In use, multiple lamps provided in this embodiment can be arranged in a straight line, or... Figure 9 As shown, multiple lamps provided in this embodiment are arranged in an array above the plants.

[0048] The present invention has been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, and these modifications all fall within the protection scope of the present invention.

Claims

1. An optical lens, characterized in that, The optical lens has an optical axis, an annular bottom surface, and an incident freeform surface and an exit freeform surface located on the same side of the bottom surface. The inner periphery of the bottom surface is integrally connected to the outer periphery of the incident freeform surface, and the outer periphery of the bottom surface is directly or indirectly connected to the outer periphery of the exit freeform surface. The space enclosed by the incident freeform surface forms an accommodating space for setting a light source. The incident light freeform surface is a surface of revolution, and the axis of revolution of the surface of revolution is arranged coaxially with the optical axis; The light-emitting freeform surface has a first symmetry plane and a second symmetry plane arranged perpendicularly to each other. The intersection line between the first symmetry plane and the second symmetry plane is located on the optical axis. The cross section of the light-emitting freeform surface at the position of the first symmetry plane forms two first curves symmetrically arranged with the second symmetry plane as the center. The first curve includes a first line segment, a second line segment, a third line segment, and a fourth line segment connected sequentially from one end located on the second symmetry plane to the other end. The curvature of the first line segment gradually decreases from the end of the first line segment away from the second line segment to the other end. The curvature of the second line segment gradually increases from the end of the second line segment connected to the first line segment to the other end. The curvature of the third line segment gradually increases from the end of the third line segment connected to the second line segment to the other end. The curvature of the fourth line segment gradually decreases from the end of the fourth line segment connected to the third line segment to the other end. The cross section of the light-emitting freeform surface at the position of the second symmetry plane forms a second curve symmetrically arranged with the first symmetry plane as the center. The curvature of the second curve gradually increases and then gradually decreases from its middle position to both ends.

2. The optical lens as described in claim 1, characterized in that, The generatrix of the surface of revolution is a curve that gradually approaches the optical axis from one end connected to the bottom surface to the other end, and the curvature of the generatrix of the surface of revolution gradually decreases from one end relatively close to the optical axis to the other end.

3. The optical lens as described in claim 1, characterized in that, The plane containing the outer periphery of the incident freeform surface is arranged parallel to the plane containing the outer periphery of the exit freeform surface.

4. The optical lens as described in claim 1, characterized in that, In the same direction, the curvature of the third line segment changes at a faster rate than that of the second line segment.

5. The optical lens as described in claim 1, characterized in that, The incident light freeform surface has multiple arc-shaped protrusions evenly distributed on it.

6. The optical lens as described in claim 5, characterized in that, The arc-shaped protrusion can be a spherical protrusion or a non-spherical protrusion.

7. A lamp, characterized in that, It includes an LED light and an optical lens as described in any one of claims 1-6, wherein the LED light is located within the accommodating space of the optical lens.

8. The lamp as described in claim 7, characterized in that, The LED light is located on the optical axis.

9. The lamp as described in claim 7, characterized in that, There are multiple LED lights, and each LED light is evenly distributed around the optical axis.

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