An LED lamp

Abstract

The present invention discloses an LED lamp, comprising a lamp cover and an LED light source. The LED light source is arranged above the lamp cover. The lamp cover includes a cover body made of a translucent material. The cover body has an inner surface facing the LED light source and obtained by atomization treatment. It is characterized in that: the longitudinal section of the inner surface of the cover body includes a first region in the middle. There is a center point on the longitudinal section of the inner surface. The first region is symmetrically centered on the center point. The included angle between the LED light source on the same longitudinal section and the two ends of the first region is 50°±5°. The atomization degree of the first region is greater than that of other regions on the longitudinal section of the inner surface. By making the atomization degree of the central region the largest, the originally locally strong light is distributed more evenly, the UGR value is reduced, and the light quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of lighting, and in particular to an LED lamp. Background Art

[0002] As a semiconductor device that can convert electrical energy into light energy, LEDs are widely used in various lighting fixtures due to their advantages such as high efficiency, low energy consumption, and long lifespan. These fixtures have become indispensable lighting appliances in people's lives and work. However, since LEDs themselves are Lambertian light sources, their luminous intensity is mostly lower on both sides and higher in the center, so LEDs generally cannot be directly applied to the lighting field.

[0003] For example, in engineering, to meet the illumination requirements of various occasions, a large number of fixtures generally need to be installed, which not only increases the installation workload, the number of fixtures, and the power consumption, but also causes unnecessary economic losses.

[0004] Another way is to set a light distribution structure on the lamp shade. The light distribution structure of the lamp shade is designed by the prism on the inner surface of the lamp shade and the optical treatment of the inner surface of the lamp shade, so that it can be applied to various areas and places that require lighting requirements of the fixtures. For example, an LED three-proof lamp shade disclosed in a Chinese patent with the application number 201810945878.0 includes a lamp shade main body and a lamp shade main body connecting part connected together. The lamp shade main body is located above the lamp shade main body connecting part. The inner wall of the lamp shade main body is provided with a convex transparent part, and the convex transparent part and the non-transparent part are arranged at intervals. The convex transparent part is made of a transparent prism, and the number of prisms in the cross-section of the transparent prism is at least two or more.

[0005] Although the above-mentioned lamp shade can diffuse the light emitted by the light source to a certain extent, the inner surface of this lamp shade is not optically treated or only uniformly treated, resulting in its light distribution effect as Figure 5 shown, with too high light intensity in the middle and too low light intensity on both sides, and a small illumination angle; in addition, the UGR value is also relatively large (glare), see Table 1.

[0006] Table 1 Data table of UGR (Unified Glare Rating) after the existing LED lamp is lit

[0007]

[0008] Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an LED lamp that can expand the lighting range and reduce energy consumption in view of the problems existing in the above-mentioned prior art.

[0010] The technical solution adopted by the present invention to solve the above technical problems is as follows: An LED lamp includes a lamp cover and an LED light source. The LED light source is arranged above the lamp cover. The lamp cover includes a cover body made of a translucent material. The cover body has an inner surface facing the LED light source and obtained by atomization treatment. It is characterized in that: The longitudinal section of the inner surface of the cover body includes a first area in the middle. There is a center point on the longitudinal section of the inner surface. The first area is symmetrically centered on the center point. The included angle between the LED light source and both ends of the first area on the same longitudinal section is 50° ± 5°. The atomization degree of the first area is greater than that of other areas on the longitudinal section of the inner surface.

[0011] Preferably, the longitudinal section of the inner surface of the cover body further includes second areas distributed on both sides of the first area. The two second areas are symmetrically centered on the center point. The included angle between the LED light source and both ends of the same second area on the same longitudinal section is 15° ± 5°. The surface roughness of the first area is greater than that of the second area.

[0012] Preferably, the surface roughness of the first area is four times that of the second area.

[0013] To further evenly distribute the light intensity and increase the irradiation angle, a plurality of prisms are arranged on the inner surface of the cover body of the lamp cover to form tooth-shaped stripes.

[0014] Preferably, to evenly distribute the light intensity of the entire lamp cover and increase the irradiation angle, the prisms are arranged in parallel and each prism extends in the length direction of the lamp cover.

[0015] To make the light output in the middle part of the lamp cover more uniform and the light output angle larger, while avoiding excessive light output angle on both sides and causing waste of energy, in the first area and the second area, the prisms are only arranged on the first area.

[0016] Preferably, the longitudinal section of the cover body of the lamp cover bends and protrudes away from the LED light source to form an arc.

[0017] Compared with the prior art, the advantages of the present invention are as follows: By making the atomization degree of the central area the largest, the originally locally strong light is distributed more evenly, the UGR value is reduced, and the light quality is improved; By making the atomization degree of the parts on both sides of the central area less than that of other areas, the light emitted by the light source passes through with as little attenuation as possible, thereby relatively strengthening the illumination intensity of the two side areas and increasing the irradiation angle. It is possible to reduce the number of lamps in the same space to meet the lamp illumination requirements, reduce energy consumption, and finally the emitted light forms a bat-wing light distribution effect. Description of the Drawings

[0018] Figure 1Cross-sectional view of the light source and the lamp shade of the LED lamp according to an embodiment of the present invention;

[0019] Figure 2 Schematic diagram of the lamp shade of the LED lamp according to an embodiment of the present invention;

[0020] Figure 3 is Figure 2 Enlarged schematic view of the partial Ⅰ;

[0021] Figure 4 Light intensity distribution curve graph after the LED lamp according to an embodiment of the present invention is lit;

[0022] Figure 5 Light intensity distribution curve graph after the LED lamp of the prior art is lit. Detailed implementation manners

[0023] The present invention will be further described in detail below in conjunction with the embodiments of the attached drawings.

[0024] See Figures 1 to 4 , an LED lamp, including a lamp shade 1 and an LED light source 2, the LED light source 2 is arranged above the lamp shade 1, and the lamp shade 1 is in a long strip shape.

[0025] The lamp shade 1 includes a cover body 11 made of a translucent material. A plurality of prisms 12 are arranged on the inner surface 111 of the cover body 11 facing the LED light source 2 to form tooth-shaped stripes. The prisms 12 are arranged side by side and each prism 12 extends in the length direction of the lamp shade 1. The longitudinal section (the longitudinal section is perpendicular to the length direction of the lamp shade 1) of the inner surface 111 of the cover body 11 has a center point O, and its connection line with the LED light source 2 is on a vertical axis X (in the installed state). The bottom width of the prism 12 is 1 mm to 2 mm, thereby controlling the state of the prism 12. The cover body 11 can be a shape symmetric about the center point O, or can be slightly asymmetric. In this embodiment, the cover body 11 protrudes curvedly in the direction away from the LED light source 2, and forms an arc-shaped concave in the longitudinal section. Alternatively, the cover body 11 can also be partially flat, such as the middle area of the cover body 11 is flat.

[0026] The longitudinal section of the inner surface 111 of the cover body 11 includes a first area Q1 located in the middle, second areas Q2 distributed on both sides of the first area Q1, and third areas Q3 distributed on the side of each second area Q2 away from the first area Q1. The first area Q1, the second area Q2 and the third area Q3 are all symmetrically centered around the center O. The angle α between the LED light source 2 and the two ends of the first area Q1 on the same longitudinal section is 50°±5°, the angle β between the LED light source 2 and the two ends of the same second area Q2 is 15°±5°, and the rest is the third area Q3. When the LED light source 2 is a point light source, the angle between the LED light source 2 and the two ends of each region refers to the angle between this point of the LED light source 2 and the two ends of each region; when the LED light source 2 is a surface light source, the angle between the LED light source 2 and the two ends of each region refers to the angle between the boundary of the light-emitting part of the LED light source 2 on the longitudinal section (the boundary point far away from the LED light source 2 in the horizontal direction) and the two ends of the corresponding region. At this time, the LED light source 2 has two boundaries, each boundary corresponds to one end of the corresponding region, and the angle between each boundary and the connecting line between the corresponding end of the corresponding region constitutes the angle between the LED light source 2 and the two ends of each region. The first area Q1 of each longitudinal section constitutes a long strip surface, the second area Q2 of each longitudinal section constitutes a long strip surface, and the third area Q3 of each longitudinal section constitutes a long strip surface, thereby constituting a complete inner surface 111.

[0027] The inner surface 111 of the cover body 11 is atomized. During the atomization, the sand pattern in the mold etching is used as the main body, and the depth is selected to be 0.01-0.08 mm. In the above-mentioned atomization process, Yixin Motor etching plates, such as YS20046-B texture and YS20025-B texture, can be used for etching. The cover body 11 after atomization can scatter the light emitted by the LED light source 2 and evenly distribute it to all parts of the cover body 11.

[0028] In the existing LED lamps, the light emitted by the LED light source 2 has the highest intensity when projected from the middle of the lampshade 1, which is prone to glare. In order to avoid glare caused by excessive light intensity in the middle of the lampshade 1, the atomization degree of the first area Q1 is greater than that of the second area Q2 and the third area Q3. In this embodiment, the atomization degree is expressed as surface roughness (it can also be other etching texture types, etc.), that is, the surface roughness of the first area Q1 is greater than that of the second area Q2 and the third area Q3. The YS20025-B texture can be used for atomization. As a result, the first area Q1 evenly distributes the light emitted by the LED light source 2 and weakens the light intensity (diffuses and evens out the light, and changes the light path so that only part of the light is emitted through the cover body 11), avoiding the generation of glare. See. Figure 4 and Figure 5, it can be seen that the light intensity projected from the middle area of the lampshade 1 (shown by the solid line, and the values within the photometric diagram circle represent the light intensity) is significantly reduced compared to existing lamps.

[0029] Due to the uniformly processed lampshade 1, the light intensity on both sides of the middle area (corresponding to the second area Q2 of this application) is significantly reduced, unable to meet the normal lighting requirements. Therefore, in this application, the atomization degree of the second area Q2 is less than that of the first area Q1 and the third area Q3. In this embodiment, the atomization degree is represented by surface roughness, that is, the surface roughness of the second area Q2 is less than that of the first area Q1 and the second area Q3. The YS20046-B type texture is used for processing to form an effect similar to frosted glass. Thus, the light emitted by the LED light source 2 in the second area Q2 is projected in an almost non-attenuated manner. Refer to Figure 4 and Figure 5 , it can be seen that the light intensity projected from the second area Q2 of the lampshade 1 (shown by the solid line, and the values within the photometric diagram circle represent the light intensity) is significantly enhanced compared to existing lamps. Through such a design, the lighting intensity on both sides of the light source is enhanced and the lighting angle is enlarged. Thus, on the premise of the same lighting requirements, the number of lamps required in the same space is reduced, and the energy consumption is lowered.

[0030] Preferably, the surface roughness is represented by Ra (arithmetical mean deviation of the profile). The Ra of the first area Q1 is four times that of the second area Q2 and twice that of the third area Q3. When Ra of the first area Q1 = 6.3, Ra of the second area Q2 = 1.6, and Ra of the third area Q3 = 3.2, these surface roughness values are selected in this embodiment; when Ra of the first area Q1 = 3.2, Ra of the second area Q2 = 0.8, and Ra of the third area Q3 = 1.6; when Ra of the first area Q1 = 1.6, Ra of the second area Q2 = 0.4, and Ra of the third area Q3 = 0.8.

[0031] To make the light output from the middle part of the lampshade 1 more uniform and the light output angle larger, while avoiding excessive light output angles on both sides resulting in waste of energy (when lighting, a too large irradiation range is often not required, and more focus is on the middle and positions close to the middle), the above-mentioned prism 12 is arranged in the first area Q1, and the second area Q2 does not have the prism 12. Thus, when the light emitted by the light source 2 passes through the lampshade 1, it is refracted by the prism 12 in the first area Q1, thereby increasing the light output angle, while in the second area Q2, it is emitted without refraction, almost retaining the original emission angle.

[0032] Through the above-mentioned prism 12 and optical treatment (atomization), when the light source irradiates the prism 12, a part of the light is projected out through the inner surface of the cover 11, and the other part of the light is refracted by the prism 12. The refraction angle is controlled according to the light output requirement, and the refracted light is refracted out of the lamp at a certain angle. Such a structural design makes full use of the light emitted by the LED light source 2, distributes the originally locally strong light more evenly, achieves a large light output angle, increases the irradiation range, and at the same time reduces the UGR value (see Table 2), improves the light quality. Finally, the emitted light forms a bat-wing light distribution effect, which can reduce the number of lamps in the same space while meeting the lamp illuminance requirements.

[0033] Table 2 Data table of UGR (Unified Glare Rating) after the LED lamp of the present invention is lit

[0034]

[0035]

Claims

1. An LED lamp, comprising a lamp cover (1) and an LED light source (2), wherein the LED light source (2) is arranged above the lamp cover (1), the lamp cover (1) includes a cover body (11) made of a translucent material, and the cover body (11) has an inner surface (111) facing the LED light source (2) and obtained by atomization treatment. Characterized in that: The longitudinal section of the inner surface (111) of the cover body (11) includes a first region (Q1) in the middle, the longitudinal section of the inner surface (111) has a center point (O), the first region (Q1) is symmetric about the center point (O), and the included angle (α) between the LED light source (2) and the two ends of the first region (Q1) in the same longitudinal section is 50° ± 5°. The atomization degree of the first region (Q1) is greater than that of other regions in the longitudinal section of the inner surface (111). The longitudinal section of the inner surface (111) of the cover body (11) further includes second regions (Q2) distributed on both sides of the first region (Q1). The two second regions (Q2) are symmetric about the center point (O), and the included angle (β) between the LED light source (2) and the two ends of the same second region (Q2) in the same longitudinal section is 15° ± 5°. The surface roughness of the first region (Q1) is greater than that of the second region (Q2). A plurality of prisms (12) are arranged on the inner surface (111) of the cover body (11) of the lamp cover (1) to form tooth-shaped stripes. The prisms (12) are arranged in parallel and each prism (12) extends in the length direction of the lamp cover (1). In the first region (Q1) and the second regions (Q2), the prisms (12) are only arranged on the first region (Q1).

2. The LED lamp according to claim 1, Characterized in that: The surface roughness of the first region (Q1) is four times that of the second region (Q2).

3. The LED lamp according to claim 1 or 2, Characterized in that: The longitudinal section of the cover body (11) of the lamp cover (1) bends and protrudes away from the LED light source (2) to form an arc.

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