Lens and light source device

Abstract

The utility model relates to the technical field of lenses, and provides a lens and a light source device. The lens comprises a lens body, the lens body is a plano-convex lens, and the lens body is provided with a convex surface and a bottom plane. An accommodating groove and a reflecting groove which are recessed towards the interior of the lens body are respectively formed in the bottom plane of the lens body; the containing groove is located in the middle of the bottom plane and used for containing the light source assembly, the reflection groove is located in at least one side of the two opposite sides of the containing groove, the inner wall of the reflection groove forms a reflection face, and the reflection face is used for reflecting light rays, emitted to the reflection groove, of the light source assembly; the inner wall of the reflecting groove forms a reflecting surface, so that light rays with large light emitting angles on the two sides of the light source assembly can be well restrained, the color of the light rays is uniform after the light rays are emitted through the lens, and the light mixing effect is improved.

Description

Technical Field

[0001] This application relates to the field of lens technology, and in particular to a lens and light source device. Background Technology

[0002] Light emitting diodes (LEDs), as a highly efficient light source, have been widely used in various fields, especially in backlight display products, due to their environmental friendliness, energy efficiency, and long lifespan. Typically, LED light sources are used in conjunction with lenses to diffuse the light, improve light distribution, and optimize visual effects, in order to achieve uniform light distribution.

[0003] However, in actual use, LED light sources consist of multiple light-emitting chips arranged in a straight line. Since the light-emitting chip in the center of the LED light source and the light-emitting chips on both sides are in different positions in the lens, some of the light emitted by the light-emitting chips on both sides will be emitted from both sides of the lens at a larger emission angle, resulting in low light convergence efficiency. After the light is emitted through the lens, there will be uneven color distribution in some areas, resulting in poor light mixing effect. Summary of the Invention

[0004] The purpose of this application is to provide a lens and light source device to solve the problem that existing LED light sources exhibit uneven color distribution and overlapping in local areas after light is emitted through a lens, resulting in poor light mixing effect.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, embodiments of this application provide a lens for placing a light source assembly; the lens includes a lens body, which is a plano-convex lens, having a convex surface and a bottom plane; the lens body has a receiving groove and a reflecting groove recessed toward the interior of the lens body on the bottom plane; the receiving groove is located in the middle of the bottom plane and is used to receive the light source assembly, the reflecting groove is located on at least one of the opposite sides of the receiving groove, the inner wall of the reflecting groove forms a reflecting surface, and the reflecting surface is used to reflect light rays from the light source assembly directed toward the reflecting groove.

[0007] In some embodiments, the reflective surface is inclined, and the end of the reflective surface closer to the bottom plane is closer to the receiving groove than the end farther from the bottom plane; a first angle is formed between the reflective surface and the bottom plane. By adopting the above technical solution, the first drawer has a first sliding part and a second sliding part at opposite ends along the vertical direction, and the second drawer has a corresponding sliding support part, so that the first drawer can cooperate with the second drawer in any usage position.

[0008] In some embodiments, the angle of the first included angle is in the range of 45°-60°.

[0009] In some embodiments, the depth of the reflective groove recessed from the bottom plane toward the interior of the lens body is L1, and the maximum thickness of the lens body is T1; wherein, L1 < 1 / 3T1.

[0010] In some embodiments, the cross-sectional shape of the reflective groove is triangular, and the cross-sectional width of the reflective groove gradually decreases from the bottom plane toward the interior of the lens body.

[0011] In some embodiments, the cross-sectional shape of the reflective groove is a right-angled triangle, and the reflective surface forms the hypotenuse of the right-angled triangle.

[0012] In some embodiments, the light source assembly includes an LED module, the LED module including at least three LED chips arranged along a first direction; the accommodating groove is provided with the reflective groove on both sides of the opposite side in the first direction.

[0013] In some embodiments, the light source assembly further includes a chip carrier, the chip carrier having a mounting groove at one end facing the receiving groove, and each of the LED chips being disposed in the mounting groove along the first direction.

[0014] In some embodiments, the cross-sectional width of the lens body gradually decreases in the direction from the bottom plane toward the convex surface.

[0015] Secondly, embodiments of this application also provide a light source device, including at least one light source component and at least one lens corresponding to the light source component, wherein each light source component is disposed in a receiving groove of the corresponding lens.

[0016] The lens and light source device of this application, by setting a reflective groove on the bottom plane of the lens body, the reflective groove is formed inside the lens body and communicates with the outside air, and the inner wall of the reflective groove forms a reflective surface; based on the total internal reflection theorem, the light rays with large emission angles on both sides of the light source component are reflected by the reflective surface after being shot from the inside of the lens body to the reflective groove and emitted out of the lens body with a smaller emission angle, thereby better constraining the light rays with large emission angles on both sides, so that the light rays of the light source component are uniform in color after being emitted through the lens, and improving the light mixing effect. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A three-dimensional structural schematic diagram of a lens provided in an embodiment of this application;

[0019] Figure 2 A cross-sectional view of a lens provided in an embodiment of this application; wherein the light source assembly is located at the bottom of the receiving groove;

[0020] Figure 3 A schematic diagram of light irradiation of a light source assembly in a receiving groove is provided for one embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the connection structure between the bottom of the lens body and the light source assembly provided in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the bottom structure of the light source assembly and lens body structure provided in an embodiment of this application.

[0023] The following are the labeling elements in the figure:

[0024] 100. Lens;

[0025] 1. Lens body;

[0026] 101. Convex surface; 102. Bottom plane;

[0027] 2. Light source assembly;

[0028] 21. LED module; 2101. LED chip; 22. Chip carrier; 2201. Mounting slot;

[0029] 3. Receiving groove; 4. Reflective groove; 401. Reflective surface; 5. Connecting lug;

[0030] a, First included angle; X, First direction. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0034] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0035] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] For ease of description, unless otherwise specified, the directions of up, down, left, right, front, and back in this article are based on the state of the lens when it is in use. The front of the lens is the front, the opposite direction is the back, and the vertical direction is the up and down direction.

[0037] In current technology, LED light sources are typically used with lenses to achieve uniform light distribution. Lenses are used to diffuse light, improve light distribution, and optimize visual effects. An LED light source consists of multiple LED chips arranged in a straight line. Because the central LED chip and the chips on either side are positioned differently within the lens, some of the light emitted from the chips on the sides exits the lens at a larger angle. This results in low light convergence efficiency and uneven color distribution in localized areas after passing through the lens, leading to poor light mixing.

[0038] Based on this, in order to solve the above problems, this application designs a lens by setting a reflective groove on the bottom plane of the lens body. The reflective groove is formed inside the lens body and is connected to the outside air. The inner wall of the reflective groove forms a reflective surface. Based on the total internal reflection theorem, the light rays with large emission angles on both sides of the light source component are reflected by the reflective surface after being shot from the inside of the lens body to the reflective groove and emitted out of the lens body with a smaller emission angle. This can better constrain the light rays with large emission angles on both sides, and can uniformly light the light and improve the light mixing effect.

[0039] refer to Figure 1 , Figure 2 and Figure 3 This application provides a lens 100 for placing a light source assembly 2. The lens 100 includes a lens body 1, which is a plano-convex lens. The lens body 1 has a convex surface 101 and a bottom surface 102. The lens body 1 has a receiving groove 3 and a reflecting groove 4 recessed towards the interior of the lens body 1 on the bottom surface 102. The receiving groove 3 is located in the middle of the bottom surface 102 and is used to receive the light source assembly 2. The reflecting groove 4 is located on at least one of the opposite sides of the receiving groove 3. The inner wall of the reflecting groove 4 forms a reflecting surface 401, which is used to reflect the light from the light source assembly 2 directed towards the reflecting groove 4.

[0040] Understandably, the lens 100 of this application is specifically applied in an LED multicolor light source device. The light source component 2 includes multicolor LED chips, which are combined to present a rich color effect. The light source component 2 is housed in the receiving groove 3 of the lens body 1. The lens body 1 is used to diffuse and homogenize the light from the light source component 2, thereby improving the light distribution and uniform light color.

[0041] Specifically, the reflective groove 4 is formed inside the lens body 1 and located on one side of the receiving groove 3, and the reflective groove 4 is connected to the outside air. Based on the theorem of total internal reflection: when light travels from the optically denser medium (lens body 1) to the optically less dense medium (air in the reflective groove 4), and the angle of incidence is greater than or equal to the critical angle, the light will not enter the optically less dense medium, and all the light will be reflected back into the original medium, and there will be no more refraction of light; therefore, the light rays from both sides of the light source assembly 2 that travel through the lens body 1 to the reflective groove 4 will be reflected by the reflective surface 401 of the reflective groove 4 and emitted again from the lens body 1, and the light rays will be emitted outside the lens body 1 at a smaller emission angle.

[0042] refer to Figure 3 The light emission angle is the angle between the light ray and the bottom plane 102, and this angle is greater than or equal to 90°.

[0043] The lens 100 of this application has a reflective groove 4 formed inside the lens body 1 and connected to the outside air by setting a reflective groove 4 on the bottom plane 102 of the lens body 1. The inner wall of the reflective groove 4 forms a reflective surface 401. Based on the total internal reflection theorem, the light rays with large emission angles on both sides of the light source component 2 are reflected by the reflective surface 401 after being emitted from the inside of the lens body 1 to the outside, so as to better constrain the light rays with large emission angles on both sides, so that the light rays of the light source component 2 are uniform in color and more uniform in light mixing after being emitted from the lens body 1.

[0044] refer to Figure 2 , Figure 3 In some embodiments, the reflective surface 401 is inclined, and the end of the reflective surface 401 closer to the bottom plane 102 is closer to the receiving groove 3 than the end farther away from the bottom plane 102; a first included angle α is formed between the reflective surface 401 and the bottom plane 102.

[0045] Specifically, the reflective surface 401 is an inclined surface, and the bottom end of the reflective surface 401 is closer to the receiving groove 3 than the top end of the reflective surface 401, and then refers to... Figure 3 The light emitted by the light source assembly 2 towards the reflective surface 401 is reflected and emitted from the lens body 1 to the outside at a smaller emission angle, thus effectively constraining the emission angle of the light on both sides of the light source assembly 2.

[0046] In some embodiments, the angle range of the first included angle α is 45°-60°.

[0047] In existing known technologies, the critical angle for total internal reflection is the angle of incidence that minimizes the occurrence of total internal reflection. Taking visible light entering air (or vacuum) from glass (lens) as an example, the critical angle is approximately 41.5°. Therefore, the angle of incidence of the light rays hitting the reflecting surface 401 must be no less than 41.5°. Furthermore, to ensure the reflective effect of the reflecting surface 401, it needs to be tilted relative to the bottom plane 102, with the first included angle α not exceeding 90°.

[0048] For example, this application sets the first included angle α to a range of 45°-60° so that the reflective surface 401 is at a suitable angle to satisfy the reflection effect of light.

[0049] Specifically, the angle of the first included angle α can be 45°, 46°, 48°, 50°, 52°, 54°, 56°, 58°, 60°, etc.

[0050] refer to Figure 3 In some embodiments, the depth of the reflective groove 4 recessed from the bottom plane 102 toward the interior of the lens body 1 is L1, and the maximum thickness of the lens body 1 is T1; wherein, L1 < 1 / 3T1.

[0051] Understandably, the purpose of the reflective surface 401 is to reflect light rays with large emission angles on both sides of the light source assembly 2. However, if the height of the reflective groove 4 is too high, it will reflect some light rays at normal emission angles, blocking some light from escaping and causing the light spot angle to be unable to open, thus affecting the illumination effect. Therefore, the depth L1 of the reflective groove 4 is set to be less than 1 / 3 of the maximum thickness of the lens body 1, so that the reflective surface 401 reflects light rays with large emission angles on both sides of the light source assembly 2 without affecting light rays at normal emission angles.

[0052] refer to Figure 2 , Figure 3 In some embodiments, the cross-sectional shape of the reflective groove 4 is triangular, and the cross-sectional width of the reflective groove 4 gradually decreases from the bottom plane 102 toward the interior of the lens body 1.

[0053] The cross-sectional shape of the reflective groove 4 is triangular, which is easy to manufacture by slotting. Understandably, the lens body 1 is a plano-convex lens, and the width of the lens body 1 gradually decreases from bottom to top from the bottom plane 102. The cross-sectional width of the reflective groove 4 is also gradually decreased from bottom to top from the bottom plane 102. Thus, the width of the reflective groove 4 is consistent with that of the lens body 1, which can reduce the space occupied by the reflective groove 4 in the internal space of the lens body 1 and not affect the light transmission effect of the light-transmitting body 1 to the light source component 2.

[0054] refer to Figure 2In some embodiments, the cross-sectional shape of the reflective groove 4 is a right triangle, and the reflective surface 401 forms the hypotenuse of the right triangle.

[0055] Specifically, the cross-sectional shape of the reflective groove 4 is a right triangle. The relationship between the lengths of the three sides of the right triangle satisfies the Pythagorean theorem. Therefore, by setting the length of one of the right-angled sides, the depth of the reflective groove 4 can be directly set. By setting the length of the other right-angled side, the length of the reflective surface 401 and the angle of the first included angle α can be set. This allows the height of the reflective groove 4, the length of the reflective surface 401, and the angle of the first included angle α to be calculated and designed, making the structural design simpler.

[0056] refer to Figure 2 , Figure 4 In some embodiments, the light source assembly 2 includes an LED module 21, which includes at least three LED chips 2101 arranged along the first direction X; the receiving groove 3 has reflective grooves 4 on both sides of the opposite sides in the first direction X.

[0057] The LED module 21 includes at least three LED chips 2101, each capable of emitting at least red, green, and blue light. Understandably, based on the RGB (Red, Green, Blue) three-primary-color principle, a light source composed of red, green, and blue LED chips flows through three independent current channels, adjusting the color and brightness by controlling the current. Finally, the human eye perceives different colors and brightness levels, resulting in a rich color effect. Adding white or other colored LED chips to the red, green, and blue base can further expand the color range.

[0058] Each LED chip 2101 is arranged along a first direction X, which is the X direction shown in the figure. Due to the different arrangement directions, after light is emitted through a conventional lens, uneven color overlap will occur in some areas. For example, if the LED module 21 includes LED chips 2101 of red, green and blue light, after the red LED chip 2101 located on one side of the first direction X emits light, more red light will be transmitted on the corresponding side, and after the blue LED chip 2101 located on the other side of the first direction X emits light, more blue light will be transmitted on the corresponding side, resulting in poor light mixing effect.

[0059] This application provides reflective grooves 4 on both sides of the receiving groove 3 along the first direction X. The reflective grooves 4 on both sides can reflect the light emitted by the LED chips 2101 located on both sides of the first direction X, so that the light lens body 1 is directed to the outside. This constrains the light emitted by the LED chips 2101 on both sides with larger light emission angles, making the light mixing of the LED chips 2101 of different colors more uniform.

[0060] refer to Figure 4 and Figure 5 In some embodiments, the light source assembly 2 of this application further includes a chip carrier 22 disposed in the receiving groove 3. The chip carrier 22 is provided with a mounting groove 2201 at one end facing the receiving groove 3, and each LED chip 2101 is disposed in the mounting groove 2201 along the first direction X.

[0061] Specifically, the LED module 21 includes at least three LED chips 2101 for emitting red light, emitting green light, and emitting blue light, which are disposed in the chip carrier 22 and arranged sequentially along the first direction.

[0062] The chip carrier 22 has a mounting groove 2201 on its top, and each LED chip 2101 is arranged in the mounting groove 2201 along the first direction X. The chip carrier 22 can be accommodated at the bottom of the receiving groove 3, and the bottom of the chip carrier 22 is opaque, so that the light from each LED chip 2101 can be fully directed onto the lens body 1, thereby improving the light output effect.

[0063] refer to Figure 2 and Figure 3 In some embodiments, the cross-sectional width of the lens body 1 gradually decreases from the bottom plane 102 toward the convex surface 101.

[0064] Specifically, the convex surface 101 has a shape that is, but is not limited to, a hemispherical, dome, semi-elliptical, or dome-shaped truncated body with the dome cut off at the head end.

[0065] Both the receiving groove 3 and the reflecting groove 4 are formed inside the lens body 1, so there is no need to perform structural processing on the convex surface 101 of the lens body 1.

[0066] In some embodiments, the lens body 1 is made of one or more of PMMA (polymethyl methacrylate), PC (polycarbonate), and PS (polystyrene). The lens body 1 is integrally molded in a mold using injection molding, which makes molding faster and manufacturing simpler.

[0067] For example, refer to Figure 1The bottom plane 102 of the lens body 1 has multiple outwardly protruding connecting ears 5. Specifically, in the injection molding process of the lens body 1, multiple lens bodies 1 are simultaneously processed in the mold. The lens bodies 1 are connected to each other through the connecting ears 5. After injection molding, the connecting ears 5 of each interconnection can be directly cut to separate the lens bodies 1 without damaging the convex surface 101 of the lens body 1. This is beneficial for mass processing of the lens bodies 1 and improves production efficiency.

[0068] This application embodiment also provides a light source device (not shown), including at least one light source component 2 and at least one lens 100 corresponding to the light source component 2, wherein the lens 100 is the lens 100 described above; each light source component 2 is disposed in the receiving groove 3 of the corresponding lens 100.

[0069] The light source component 2 is an RGB-based LED light source; the light source device also includes a circuit board for electrical connection with the light source component 2, which can control each LED chip of the light source component 2.

[0070] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lens for a light source assembly, characterized by The lens comprises a lens body, the lens body is a plano-convex lens, the lens body has a convex surface and a bottom plane; the lens body is provided with a containing groove and a reflecting groove on the bottom plane respectively, the containing groove is recessed towards the inside of the lens body, and the reflecting groove is recessed towards the inside of the lens body; the containing groove is located in the middle of the bottom plane and is used for containing the light source assembly, the reflecting groove is located on at least one side of the containing groove, an inner wall of the reflecting groove forms a reflecting surface, and the reflecting surface is used for reflecting light emitted by the light source assembly towards the reflecting groove.

2. The lens of claim 1, wherein The reflecting surface is an inclined surface, one end of the reflecting surface close to the bottom plane is closer to the containing groove than the other end of the reflecting surface away from the bottom plane; a first included angle is formed between the reflecting surface and the bottom plane.

3. The lens of claim 2, wherein The first included angle ranges from 45° to 60°.

4. The lens of claim 1, wherein The depth of the reflecting groove recessed towards the inside of the lens body from the bottom plane is L1, and the maximum thickness of the lens body is T1; wherein L1 < 1 / 3T1.

5. The lens of any one of claims 1-4, wherein, The cross-sectional shape of the reflecting groove is a triangle, and the cross-sectional width of the reflecting groove gradually decreases in the direction from the bottom plane towards the inside of the lens body.

6. The lens of claim 5, wherein, The cross-sectional shape of the reflecting groove is a right-angled triangle, and the reflecting surface forms the hypotenuse of the right-angled triangle.

7. The lens of claim 1, wherein The light source assembly comprises an LED module, the LED module comprises at least three LED chips arranged in a first direction; the containing groove is provided with the reflecting groove on the opposite sides in the first direction.

8. The lens of claim 7, wherein, The light source assembly further comprises a chip carrier, one end of the chip carrier towards the containing groove is provided with a mounting groove, and each LED chip is arranged in the mounting groove in the first direction.

9. The lens of claim 1, wherein, The cross-sectional width of the lens body gradually decreases in the direction from the bottom plane towards the convex surface.

10. A light source apparatus, characterized by comprising: The light source assembly comprises at least one light source assembly and at least one lens corresponding to the light source assembly, the lens is the lens as claimed in any one of claims 1 to 9, and each light source assembly is arranged in the containing groove of the corresponding lens.

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