Lens parameter calculation method of uniform light emitting lamp and uniform light emitting lamp

Abstract

The application provides a lens parameter calculation method of a uniform light emitting lamp and a uniform light emitting lamp. The lamp comprises multiple rings of light sources arranged on a substrate and an external lampshade. A first light distribution lens and a second light distribution lens are arranged between the substrate and the lampshade to change the light emitting angle of the light sources. The method comprises: adjusting a first curve and a second curve of the first light distribution lens, so that the first illuminance of the light sources covered by the first light distribution lens in each area of the lampshade surface reaches a first preset threshold; determining the maximum illuminance in the first illuminance and a ring-shaped area formed by the maximum illuminance; adjusting a third curve of the second light distribution lens, so that the difference between the second illuminance of the lampshade surface surrounded by the ring-shaped area and the maximum illuminance is less than a preset difference; and determining the curve data of the first curve, the second curve and the third curve respectively, and the curve data is the lens parameter of the lamp. The application can make the small area LED lamp realize the uniform light emitting effect of the lampshade surface illuminance.

Description

Technical Field

[0001] The present invention relates to the field of lighting technology, and in particular to a method for calculating lens parameters of a uniform light-emitting lamp and a lamp with uniform light-emitting properties. Background Art

[0002] In recent years, the light-emitting diode (LED) industry has grown rapidly. LED lights are not only used for standalone home lighting, but are also integrated into other household appliances to create convenient and practical home products, such as fan lights. However, the internal structure of these home products is often limited, resulting in a smaller direct-light emitting surface, which in turn affects the product's light output.

[0003] In the prior art, the lighting effect of LED lamps is generally changed in the following ways: one is to increase the number of light sources to improve the lighting effect, but the space for LED lamps in home products is small and there is not enough space to add light sources; the other is to change the lighting effect by setting a mechanical structure, but setting a mechanical structure also requires a large space, and the mechanical structure is prone to malfunctions such as jamming, and cannot always maintain a good lighting effect, making it difficult to apply to products that integrate LED lamps with home furnishings.

[0004] Therefore, there is an urgent need for a method to enable the surface of a lampshade of a small-area LED lamp to emit light evenly. Summary of the Invention

[0005] The embodiments of the present invention provide a method for calculating lens parameters of a uniform light-emitting lamp and a uniform light-emitting lamp, so as to solve the problem of uneven illumination on the surface of a lampshade of a small-area LED lamp in the prior art.

[0006] In a first aspect, an embodiment of the present invention provides a method for calculating lens parameters of a uniform light-emitting lamp, wherein the lamp includes a plurality of rings of light sources and an external lampshade arranged on a substrate, and a first light-distributing lens and a second light-distributing lens for changing the light-emitting angle of the light source are further arranged between the substrate and the lampshade; the first light-distributing lens is designed to be annular and covers the light source in the edge area, and the second light-distributing lens covers the light source in the center area; the inner arc of the first light-distributing lens is defined as a first curve, the outer arc of the first light-distributing lens is defined as a second curve, and the inner and outer arcs of the second light-distributing lens are the same and are defined as a third curve; the inner arc is the arc of the side of the lens close to the light source along the diameter direction of the lamp, and the outer arc is the arc of the side of the lens away from the light source along the diameter direction of the lamp;

[0007] The method includes:

[0008] Adjusting the first curve and the second curve so that the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold;

[0009] determining a maximum illumination in the first illumination and an annular area formed by the maximum illumination;

[0010] Adjusting the third curve so that the difference between the second illuminance and the maximum illuminance of the lampshade surface surrounded by the annular area is less than a preset difference;

[0011] The curve data of the first curve, the second curve and the third curve are respectively determined, and the curve data are used as the lens parameters of the lamp.

[0012] In a possible implementation, the first curve is a symmetrical curve, the second curve is an asymmetrical curve, and the second curve is divided by a vertex into a first curve segment away from the center of the lamp and a second curve segment close to the center of the lamp;

[0013] Adjusting the first curve and the second curve so that the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold includes:

[0014] Gradually adjusting the first curve until the illuminance of the light source covered by the first light distribution lens at the edge of the lampshade surface reaches a second preset threshold, and the second preset threshold is less than the first preset threshold;

[0015] The first and second sections of the second curve are gradually adjusted so that the first section is away from the covered light source and the second section is close to the covered light source until the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold.

[0016] In a possible implementation, the lamp is provided with at least one circle of first light distribution lenses;

[0017] When the lamp is provided with at least two circles of first light distribution lenses, the first curve and the second curve of each circle of the first light distribution lenses are adjusted in sequence from the edge to the center of the lamp.

[0018] In a possible implementation, respectively determining the curve data of the first curve, the second curve, and the third curve at this time includes:

[0019] respectively determining the first point position data of the first curve, the second point position data of the second curve, and the third point position data of the third curve at this time;

[0020] Fitting the first point data to obtain curve data of the first curve;

[0021] Fitting the second point data to obtain curve data of the second curve;

[0022] The third point data is fitted to obtain curve data of the third curve.

[0023] In a possible implementation, a ratio of an outer surface area of ​​the first light distribution lens to an outer surface area of ​​the second light distribution lens is 1.5 to 2.5.

[0024] In a possible implementation, a ratio of the luminous flux of the first light distribution lens to the luminous flux of the second light distribution lens is 2.5-3.

[0025] In a possible implementation, the substrate is an aluminum substrate.

[0026] In a possible implementation, the first preset surface area of ​​the first light distribution lens and the second preset surface area of ​​the second light distribution lens are both subjected to frosted surface treatment or leather grain surface treatment.

[0027] In a second aspect, an embodiment of the present invention provides a lamp with uniform light output, wherein lens parameters of the lamp with uniform light output are determined by the lens parameter calculation method of the lamp with uniform light output according to the first aspect or any possible implementation of the first aspect.

[0028] The embodiment of the present invention provides a lens parameter calculation method for a uniform light-emitting lamp and a uniform light-emitting lamp. The method adjusts a first curve and a second curve so that the first illuminance of each area of ​​the lampshade surface covered by the first light distribution lens reaches a first preset threshold value. The first light distribution lens gives priority to the edge area of ​​the lampshade without adding a light source or a mechanical structure, thereby improving the illuminance of the edge area and ensuring the light-emitting effect of the edge area, avoiding the problem that light of a conventional Lambertian angle cannot reach the edge area of ​​the lampshade, resulting in a dark edge area of ​​the lamp. By making the first illuminance reach the first preset threshold value, it is possible to avoid excessive refraction of light in a small-area lamp onto the structural side wall of the lamp, resulting in light loss, thereby achieving effective use of the light source; determining the maximum illuminance and the minimum illuminance in the first illuminance The annular area formed by the large illumination; adjusting the third curve so that the difference between the second illumination and the maximum illumination of the lampshade surface surrounded by the annular area is less than the preset difference, which can make the illumination of the central area of ​​the lampshade the same as or similar to the maximum illumination, so that the illumination of each area on the lampshade surface is similar, and the uniform light output of the lampshade surface is achieved; respectively determine the curve data of the first curve, the second curve and the third curve at this time, and use the curve data as the lens parameters of the lamp. The lamp is set by the lens parameters, which can make the illumination of the lampshade surface the same or similar, so that the small-area LED lamp can achieve a uniform light output effect on the lampshade surface; and by refracting the light to the edge of the lamp, the illumination of the lampshade edge is increased, which can enable the LED lamp with a small-area substrate to achieve a uniform light output effect on the large-area lampshade surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is a structural diagram of a lamp provided by an embodiment of the present invention;

[0031] Figure 2 1 is a schematic structural diagram of a first light distribution lens and a second light distribution lens provided in an embodiment of the present invention;

[0032] Figure 3 This is a flowchart of a method for calculating lens parameters of a uniform light-emitting lamp provided by an embodiment of the present invention;

[0033] Figure 4 is a structural schematic diagram of a first light distribution lens provided by an embodiment of the present invention;

[0034] Figure 5 is a schematic structural diagram of a light source in a lamp provided by an embodiment of the present invention;

[0035] Figure 6 Schematic diagram of the principle of refraction of light by the first light distribution lens provided in an embodiment of the present invention;

[0036] Figure 7 This is a light output effect diagram of the first light distribution lens provided by an embodiment of the present invention;

[0037] Figure 8 This is a light output effect diagram of the second light distribution lens provided by an embodiment of the present invention;

[0038] Figure 9 1 is a light output effect diagram of the first light distribution lens and the second light distribution lens provided in an embodiment of the present invention;

[0039] Figure 10 is a schematic diagram of a light distribution curve of a conventional direct-lit lamp provided in an embodiment of the present invention;

[0040] Figure 11 Schematic diagram of a light distribution curve of a lamp provided with a light distribution lens according to an embodiment of the present invention;

[0041] Figure 12 This is a light output effect diagram of a lamp without a lens provided in an embodiment of the present invention;

[0042] Figure 13 This is a diagram of the light output effect of a lamp with a lens set according to lens parameters provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In the following description, specific details such as particular system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0044] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below with reference to the accompanying drawings.

[0045] See also Figure 1 The schematic diagram of the structure of the lamp shown in the figure shows that the lamp includes a multi-circle light source 12 and an external lampshade arranged on a substrate 11. A lens 13 for changing the light output angle of the light source is also arranged between the substrate 11 and the lampshade. The lens 13 includes a first light distribution lens 131 and a second light distribution lens 132. The first light distribution lens 131 is designed as a ring and covers the light source in the edge area, and the second light distribution lens 132 covers the light source in the center area. Figure 2 As shown in the structural schematic diagram of the first light-distributing lens and the second light-distributing lens, the inner arc of the first light-distributing lens 131 is defined as the first curve 21, the outer arc of the first light-distributing lens 131 is defined as the second curve 22, and the inner arc and outer arc of the second light-distributing lens 132 are the same and are defined as the third curve 23; the inner arc is the arc of the side of the lens close to the light source along the diameter direction of the lamp, and the outer arc is the arc of the side of the lens away from the light source along the diameter direction of the lamp.

[0046] Figure 3 The flowchart of the method for calculating lens parameters of a uniform light-emitting lamp provided by an embodiment of the present invention is detailed as follows:

[0047] Step S301 : adjusting the first curve 21 and the second curve 22 so that the first illuminance of the light source covered by the first light distribution lens 131 in each area of ​​the lampshade surface reaches a first preset threshold.

[0048] In this embodiment, the inner arc and outer arc of the first light distribution lens 131 are adjusted by adjusting the first curve and the second curve, so that the light source covered by the first light distribution lens 131 is refracted to the edge area of ​​the lampshade as much as possible, thereby increasing the illumination of the edge area; and the first illumination reaches a first preset threshold value, which can avoid excessive refraction of light in a small-area lamp onto the structural side wall of the lamp while meeting the illumination requirements, thereby causing light loss, thereby effectively utilizing the light source.

[0049] Optional, see Figure 4The first light distribution lens structure shown in the schematic view, the first curve 21 can be a symmetric curve, the second curve 22 can be an asymmetric curve, and the second curve 22 can be divided by the vertex into a first segment curve 221 away from the lamp center and a second segment curve 222 close to the lamp center; accordingly, the step S301 adjusts the first curve 21 and the second curve 22, so that the first illuminance of the light source covered by the first light distribution lens 131 in each area of the lampshade surface reaches the first preset threshold value, which can be described in detail as follows: gradually adjusting the first curve 21 until the illuminance of the light source covered by the first light distribution lens 131 at the edge position of the lampshade surface reaches the second preset threshold value, which is smaller than the first preset threshold value; gradually adjusting the first segment curve 221 and the second segment curve 222 in the second curve 22, so that the first segment curve 221 is away from the covered light source, and the second segment curve 222 is close to the covered light source, until the first illuminance of the light source covered by the first light distribution lens 131 in each area of the lampshade surface reaches the first preset threshold value.

[0050] In the present embodiment, referring to Figure 5 The structure schematic view of the light source in the lamp shown, the central area is the light source covered by the second light distribution lens 132, and the edge area is the light source covered by the first light distribution lens 131. First, adjust the first curve, so that the illuminance of the light source covered by the first light distribution lens 131 at the edge position of the lampshade surface reaches the second preset threshold value, that is, the light source in the edge area is refracted to the edge position of the lampshade as much as possible, so as to ensure that the edge position of the lampshade surface has good light output effect, thereby determining the inner arc of the first light distribution lens 131.

[0051] Referring to Figure 6 The principle schematic view of the first light distribution lens refracting light rays, wherein P point is the position of a certain LED light source, A point is the position of a certain light ray on the inner arc, and B point is the position of the light ray refracted on the outer arc. Therefore, by adjusting the curve of the outer arc and changing the curvature of the curve, the incident angle of the light ray on the outer arc and the normal of the refracted light ray can be changed, so that the light ray is refracted to the edge position of the lamp. In the case of determining the inner arc, the outer arc of the first light distribution lens 131 is adjusted, wherein the first segment curve is away from the light source covered by the first light distribution lens 131, the distance between the first segment curve and the first curve is increased, the curvature of the first segment curve can be changed, and the light ray can be refracted to the edge position of the lampshade, so as to increase the illuminance of the edge position of the lampshade surface; the second segment curve is close to the light source covered by the first light distribution lens 131, the distance between the second segment curve and the first curve is reduced, the curvature of the second segment curve can be changed, the light ray refracted to the lamp center is reduced, the light ray in the edge area is increased, thereby reducing the illuminance of the central area of the lamp, increasing the illuminance around the central area, and realizing the gradual transition from the center to the edge of the lamp, avoiding the problem of too high brightness in the central area.

[0052] Furthermore, by refracting light toward the edge of the lampshade, the range of light refraction can be expanded. This means that light emitted from the LED light source on the small substrate can be refracted to a wider area. When the area of ​​the lampshade is larger than the area of ​​the light source on the substrate, the lens can be used to increase the illumination at the edge of the lampshade, thereby achieving uniform light distribution over a large area of ​​the lampshade. For example, in a fan lamp, the substrate and LED light source are relatively small, while the lampshade is relatively large. By using the method provided by the present invention to provide the first and second light distribution lenses, light emitted from the light source can be refracted toward the edge of the lampshade, increasing the illumination at the edge and achieving uniform light distribution over a large area of ​​the lampshade.

[0053] In addition, the first preset threshold and the second preset threshold can be specifically set according to the parameters of the light source in the lamp to ensure that the lamp has good light extraction efficiency.

[0054] Optionally, simulation software may be used to simulate the light emission of the lamp, and the optimal light emission effect of the lamp may be determined by adjusting the first curve and the second curve, thereby determining the final first curve and the second curve.

[0055] Furthermore, the lamp can be provided with at least one circle of first light distribution lenses 131; when the lamp is provided with at least two circles of first light distribution lenses 131, the first curve 21 and the second curve 22 of each circle of first light distribution lenses 131 are adjusted sequentially from the edge of the lamp to the center of the lamp.

[0056] In this embodiment, see Figure 2 The structural diagram of the first light distribution lens and the second light distribution lens shown in FIG. Figure 4 As shown in the structural schematic diagram of the first light-distributing lens, the lamp can be provided with at least one circle of first light-distributing lenses, and each circle of first light-distributing lenses corresponds to at least one circle of light sources; when the lamp is provided with at least two circles of first light-distributing lenses, from the edge of the lamp to the center of the lamp are the first circle of first light-distributing lenses, the second circle of first light-distributing lenses, the third circle of first light-distributing lenses... the Nth circle of first light-distributing lenses, first adjust the first circle of first light-distributing lenses so that the light source covered by the first light-distributing lenses is refracted to the edge of the lampshade as much as possible, and then adjust each circle of first light-distributing lenses toward the center in turn, so that in the subsequent adjustment process, the adjustment of the outer circle can be referred to, which not only can refract the light to the edge of the lampshade and improve the illumination at the edge of the lampshade, but also can ensure the uniformity of the illumination on the surface of the lampshade.

[0057] Optionally, after adjusting the first circle of first light distribution lenses, the second circle and subsequent first light distribution lenses can be set to the adjusted first circle of first light distribution lenses, and further adjustments can be made on this basis, which can reduce the complexity of the adjustment process of the first light distribution lenses and increase the adjustment rate.

[0058] Step S302, determine the maximum illuminance in the first illuminance and the annular region formed by the maximum illuminance.

[0059] In the present embodiment, when the first illuminance of the light source covered by the first light distribution lens 131 in each region of the lampshade surface reaches the first preset threshold value, there will be a maximum illuminance on the lampshade surface. For details, see the light emission effect diagram of the first light distribution lens shown in Figure 7 The annular region formed by the maximum illuminance is the white annular region in the left figure, and the two peaks formed in the right figure are the specific values corresponding to the annular region. It can be seen that when the first illuminance of the light source covered by the first light distribution lens 131 in each region of the lampshade surface reaches the first preset threshold value, the illuminance distribution of the lampshade surface from the center to the edge is low-high-low, and the illuminance of the center of the lampshade is lower than that of the annular region, so that the center position of the lampshade surface is dark and cannot emit light uniformly. Therefore, the illuminance of the center position of the lampshade surface needs to be compensated to realize uniform light emission of the lamp.

[0060] Step S303, adjust the third curve 23 so that the difference between the second illuminance of the lampshade surface surrounded by the annular region and the maximum illuminance is less than the preset difference.

[0061] In the present embodiment, by setting the second light distribution lens 132 and the light source covered by the second light distribution lens 132, the illuminance of the center position of the lampshade surface is improved, and by adjusting the third curve of the second light distribution lens 132, the second illuminance of the lampshade surface surrounded by the annular region is equal to or close to the maximum illuminance of the annular region, so that the illuminance distribution of the lampshade surface is uniform, and the phenomenon of dark center region and bright edge region is avoided.

[0062] The preset difference can be set according to the light emission of the light source in the lamp, and the illuminance of the center region can be compensated so that the illuminance of the center region is equal to or close to that of the annular region.

[0063] Step S304, respectively determine the curve data of the first curve 21, the second curve 22 and the third curve 23 at this time, and the curve data is the lens parameter of the lamp.

[0064] Optionally, the first point data of the first curve 21, the second point data of the second curve 22 and the third point data of the third curve 23 can be determined at this time; the first point data is fitted to obtain the curve data of the first curve 21; the second point data is fitted to obtain the curve data of the second curve 22; and the third point data is fitted to obtain the curve data of the third curve 23.

[0065] In this embodiment, the curvature and position of each point in the first curve 21, the second curve 22, and the third curve 23 can be obtained, and the point data of the first curve 21, the second curve 22, and the third curve 23 can be obtained respectively. The curves are fitted according to the point data to obtain the expression and curve data of each curve. Then, the lens is set according to the curve data. According to the expression and curve data, the curvature of each point in the set lens can be obtained, so that the light output of the first light distribution lens and the second light distribution lens can be tested to ensure that the lamp achieves a uniform light output effect. Among them, the expression of the first curve 21 can be the parabola formula y=ax 2 +bx+c, the expression of the second curve 22 can be a polynomial y=ax 4 +bx 3 +cx 2 +dx+e, the third curve 23 may be an arc-shaped curve, and the light emission angle of the third curve 23 is a Lambertian angle or a nearly Lambertian angle.

[0066] In a possible implementation, the ratio of the outer surface area of ​​the first light distribution lens 131 to the outer surface area of ​​the second light distribution lens 132 is 1.5 to 2.5.

[0067] In this embodiment, see Figure 2 In the structural schematic diagram of the first light distribution lens and the second light distribution lens shown in the figure, the external surface area of ​​the first light distribution lens 131 refers to the surface area of ​​the outer protruding part of the first light distribution lens 131 away from the light source, which does not include the surface area of ​​the inner recessed part close to the light source; the external surface area of ​​the second light distribution lens 132 also refers to the surface area of ​​the outer protruding part of the second light distribution lens 132 away from the light source, which does not include the surface area of ​​the inner recessed part close to the light source.

[0068] The ratio of the outer surface area of ​​the first light distributing lens 131 to the outer surface area of ​​the second light distributing lens 132 may be 1.5, 1.8, 2.0, 2.3, 2.5, etc., as long as it is within the range of 1.5 to 2.5.

[0069] In addition, during the adjustment process of the first curve, the second curve and the third curve, the adjustment can be performed based on the ratio of the outer surface area of ​​the first light distribution lens to the outer surface area of ​​the second light distribution lens, thereby reducing the complexity of the adjustment process.

[0070] In a possible implementation, the ratio of the luminous flux of the first light distribution lens 131 to the luminous flux of the second light distribution lens 132 is 2.5-3.

[0071] In this embodiment, the luminous flux of the first light-distributing lens 131 refers to the total amount of light emitted by the light source covered by the first light-distributing lens 131 passing through the first light-distributing lens 131, and the luminous flux of the second light-distributing lens 132 refers to the total amount of light emitted by the light source covered by the second light-distributing lens 132 passing through the second light-distributing lens 132; the luminous flux of the first light-distributing lens 131 is higher than the luminous flux of the second light-distributing lens 132, which can ensure that the first light-distributing lens still has good illumination on the surface of the lampshade when the first light-distributing lens 131 refracts the light to the edge area of ​​the lampshade as much as possible, thereby ensuring the light output efficiency of the lamp; at the same time, the luminous flux of the second light-distributing lens 132 is smaller, which can avoid the problem of excessive illumination in the central area, resulting in high illumination in the central area and low illumination in the edge area, thereby ensuring the uniformity of illumination on the surface of the lampshade.

[0072] The ratio of the luminous flux of the first light distributing lens 131 to the luminous flux of the second light distributing lens 132 may be 2.5, 2.6, 2.7, 2.8, 2.9, 3.0, etc., as long as it is within the range of 2.5 to 3.0.

[0073] In addition, the shape of the first light-distributing lens can be a circular ring, a square ring, a rectangular ring, etc., or an irregular ring, which is not limited here, and the shape of each circle of the first light-distributing lens can be the same or different; the shape of the second light-distributing lens can be a circular, square, rectangular, etc., or an irregular shape, which is not limited here. The lamp can also include multiple second light-distributing lenses, and the multiple second light-distributing lenses provide compensation for the illumination of the central area of ​​the lampshade.

[0074] In one possible implementation, the substrate 11 is an aluminum substrate. Specifically, using an aluminum substrate as the substrate of the lamp can reduce the product volume and is more suitable for small-area LED lamps, avoiding the substrate taking up a lot of space and affecting the arrangement of the light source and lens.

[0075] In a possible implementation, the first preset surface area of ​​the first light distribution lens and the second preset surface area of ​​the second light distribution lens are both subjected to frosted surface treatment or leather grain surface treatment.

[0076] In this embodiment, the surfaces of the first and second light-distributing lenses are both smooth, and portions of the surfaces of the first and second light-distributing lenses are treated with a surface treatment, such as frosting, graining, or other surface treatments. This surface treatment prevents the formation of light spots on the lens surfaces, resulting in a more natural transition of light through the lenses and a more uniform light output.

[0077] In a specific embodiment, the lens parameters are calculated using the lens parameter calculation method of the uniform light emitting lamp provided by the invention, such as Figure 7 The light emitting effect diagram of the first light distribution lens is shown, wherein the left drawing is a schematic diagram of the illuminance of each region in the lamp, and the right drawing is a data diagram of the illuminance corresponding to the left drawing; under the refraction of the first light distribution lens, the light rays of the light source covered by the first light distribution lens are refracted to the edge region of the lamp as much as possible, so that the edge region can have a certain brightness, and at the same time, a high-illuminance annular region is formed on the surface of the lamp; therefore, the light source covered by the second light distribution lens is needed to compensate the central region, so that the illuminance of the region surrounded by the annular region is similar to that of the annular region, see Figure 8 The light emitting effect diagram of the second light distribution lens is shown, wherein the left drawing is a schematic diagram of the illuminance of each region in the lamp, and the right drawing is a data diagram of the illuminance corresponding to the left drawing; by using the second light distribution lens, the central region has the highest illuminance, and the illuminance gradually decreases from the center to the edge, thereby compensating the illuminance of the region surrounded by the annular region and realizing uniform light emission on the surface of the lamp; see Figure 9 The light emitting effect diagram of the first light distribution lens and the second light distribution lens is shown, wherein the left drawing is a schematic diagram of the illuminance of each region in the lamp, and the right drawing is a data diagram of the illuminance corresponding to the left drawing; it can be known that within a range of 60 mm in radius, the illuminance of the lamp is similar, and within a range of 60 mm to 90 mm, the illuminance gradually changes, so that the lamp can realize a uniform light emitting effect.

[0078] See Figure 10 The light distribution curve schematic diagram of a conventional direct type lamp is shown, which shows the light intensity distribution curves of 0°, 45°, 90° and 135° in the conventional direct type lamp; it can be known that different light intensities exist in different position regions on the surface of the lamp, wherein the light intensity on the polar axis is the largest, and the light intensity gradually decreases as the degree of deviation from the polar axis increases; see Figure 11 The light distribution curve schematic diagram of the lamp provided with the light distribution lens is shown, which shows the light intensity distribution curves of 0°, 45°, 90° and 135° in the lamp provided with the light distribution lens; it can be known that within a range of 40° from the polar axis on the surface of the lamp, the light intensity is fluctuated around 1400 cd without a significant decreasing trend; compared with the direct type lamp, the lamp provided with the light distribution lens can obviously realize the effect of uniform light emission.

[0079] See Figure 12 The light emitting effect diagram of the lamp without the lens is shown; when the lens is not set, the central region of the lamp surface is bright and the edge curve is dark, that is, the central region has high illuminance and the edge region has low illuminance; the lens parameters are calculated by using the lens parameter calculation method of the uniform light emitting lamp provided by the application, and the lens is set according to the obtained lens parameters, see Figure 13 The light emitting effect diagram of the lamp provided with the lens according to the lens parameters is shown; it can be known that the illuminance of the lamp surface is uniform, and the effect of uniform light emission can be realized.

[0080] The embodiment of the present invention adjusts the first curve and the second curve so that the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold value. The first light distribution lens gives priority to the edge area of ​​the lampshade without adding a light source or mechanical structure, thereby improving the illuminance of the edge area and ensuring the light output effect of the edge area, avoiding the problem that light with a conventional Lambertian angle cannot reach the edge area of ​​the lampshade, resulting in a dark edge area of ​​the lamp. In addition, the first illuminance reaches the first preset threshold value, which can avoid excessive refraction of light in a small area of ​​the lamp onto the structural side wall of the lamp, causing light loss, and achieving effective utilization of the light source. Specifically, by moving the first curve away from the covered light source, the distance between the first curve and the first curve in the first light distribution lens can be increased, the curvature of the first curve can be changed, and the light can be refracted to the edge position of the lampshade. Moving the second curve closer to the covered light source can reduce the distance between the second curve and the first curve, and the curvature of the second curve can be changed, thereby reducing the light refracted to the center of the lamp and reducing the illuminance of the center area of ​​the lamp. The invention provides a method for realizing a gradual transition from the center to the edge of the lamp; determining the maximum illuminance in the first illuminance and the annular area formed by the maximum illuminance; adjusting the third curve so that the difference between the second illuminance and the maximum illuminance of the lampshade surface surrounded by the annular area is less than the preset difference, so that the illuminance of the central area of ​​the lampshade is the same or similar to the maximum illuminance, thereby making the illuminance of each area on the lampshade surface similar, and realizing uniform light emission on the lampshade surface; determining the curve data of the first curve, the second curve and the third curve at this time respectively, and using the curve data as the lens parameters of the lamp, and setting the lamp by the lens parameters, so that the illuminance on the lampshade surface is the same or similar; setting the surface of part of the lens area to a frosted surface or a leather grain surface can make the light transition on the lens surface more natural, avoid the occurrence of light spots, thereby achieving a more uniform light emission effect, and enabling a small-area LED lamp to achieve a uniform light emission effect on the lampshade surface; and by refracting light to the edge of the lamp, the illuminance at the edge of the lampshade is increased, so that an LED lamp with a small-area substrate can achieve a uniform light emission effect on a large-area lampshade surface.

[0081] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0082] The following are device embodiments of the present invention. For details not fully described therein, reference may be made to the corresponding method embodiments described above.

[0083] The embodiment of the present invention also provides a lamp with uniform light output, for details, see Figure 1As shown in the structural diagram of the lamp, the lens parameters of the lamp with uniform light emission are determined by the lens parameter calculation method of the lamp with uniform light emission in any of the above embodiments.

[0084] Specifically, 11 represents a substrate, 12 represents a multi-circle light source on the substrate, 13 represents a lens for changing the light output angle of the light source, and the lens 13 includes a first light distribution lens 131 and a second light distribution lens 132 .

[0085] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A method for calculating lens parameters of a uniform light emitting lamp, characterized in that: The lamp includes a multi-circle light source and an external lampshade arranged on a substrate. A first light distribution lens and a second light distribution lens are further arranged between the substrate and the lampshade for changing the light output angle of the light source; the first light distribution lens is designed to be annular and covers the light source in the edge area, and the second light distribution lens covers the light source in the center area. The inner arc of the first light distribution lens is defined as a first curve, the outer arc of the first light distribution lens is defined as a second curve, and the inner and outer arcs of the second light distribution lens are the same and are defined as a third curve; the inner arc is the arc of the side of the lens close to the light source along the diameter direction of the lamp, and the outer arc is the arc of the side of the lens away from the light source along the diameter direction of the lamp; The method comprises: Adjusting the first curve and the second curve so that the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold; determining a maximum illumination among the first illuminations and an annular area formed by the maximum illumination; Adjusting the third curve so that the difference between the second illuminance of the lampshade surface surrounded by the annular area and the maximum illuminance is less than a preset difference; The curve data of the first curve, the second curve and the third curve are respectively determined, and the curve data are used as the lens parameters of the lamp.

2. The lens parameter calculation method for a uniform light emitting lamp according to claim 1, characterized in that: The first curve is a symmetrical curve, the second curve is an asymmetrical curve, and the second curve is divided by a vertex into a first curve section away from the center of the lamp and a second curve section close to the center of the lamp; Adjusting the first curve and the second curve so that the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold includes: gradually adjusting the first curve until the illuminance of the light source covered by the first light distribution lens at the edge of the lampshade surface reaches a second preset threshold, and the second preset threshold is less than the first preset threshold; The first and second sections of the second curve are gradually adjusted so that the first section is away from the covered light source and the second section is close to the covered light source until the first illuminance of the light source covered by the first light distribution lens in each area of ​​the lampshade surface reaches a first preset threshold.

3. The method for calculating lens parameters of a uniform light emitting lamp according to claim 2, wherein: The lamp is provided with at least one circle of first light distribution lenses; When the lamp is provided with at least two circles of first light distribution lenses, the first curve and the second curve of each circle of the first light distribution lenses are adjusted in sequence from the edge of the lamp to the center of the lamp.

4. The method for calculating lens parameters of a uniform light emitting lamp according to claim 1, wherein: Determining the curve data of the first curve, the second curve, and the third curve at this time respectively includes: respectively determining the first point position data of the first curve, the second point position data of the second curve, and the third point position data of the third curve at this time; Fitting the first point data to obtain curve data of the first curve; Fitting the second point data to obtain curve data of the second curve; The third point data is fitted to obtain curve data of the third curve.

5. The method for calculating lens parameters of a uniform light emitting lamp according to claim 1, wherein: The ratio of the outer surface area of ​​the first light distribution lens to the outer surface area of ​​the second light distribution lens is 1.5 to 2.

5.

6. The method for calculating lens parameters of a uniform light emitting lamp according to claim 1, wherein: The ratio of the luminous flux of the first light distribution lens to the luminous flux of the second light distribution lens is 2.5-3.

7. The method for calculating lens parameters of a uniform light emitting lamp according to claim 1, wherein: The substrate is an aluminum substrate.

8. The method for calculating lens parameters of a uniform light emitting lamp according to claim 1, wherein: The first preset surface area of ​​the first light-distributing lens and the second preset surface area of ​​the second light-distributing lens are both subjected to frosted surface treatment or leather grain surface treatment.

9. A lamp with uniform light output, characterized in that: The lens parameters of the uniform light emitting lamp are determined by the lens parameter calculation method of the uniform light emitting lamp according to any one of claims 1-8.

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