LED light distribution structure, light source module and lamp

Description

TECHNICAL FIELD

[0001] The present application relates to a field of inductor manufacturing technologies, and more particularly, to an LED light distribution structure, a light source module and a lamp.BACKGROUND

[0002] Lamps are one kind of lighting equipment indispensable in people's lives, and along with development of society, functions of lamps have gradually developed from a single indoor lighting to more functions such as decoration and rendering, which continuously enriches people's living environment.

[0003] With advancement of technology, light-emitting elements of modem lamps have gradually phased out filaments and incandescent lamps, while LEDs (light-emitting diodes) are generally used as light-emitting elements. In order to facilitate assembly of lamp manufacturers, LED manufacturers usually set one LED or several LEDs on a small chip substrate to form an LED chip, so that the lamp manufacturers only need to attach the LED chip to a light source board of a lamp to connect the LED to the circuit.

[0004] Since the LED emits light in a spherical shape, the angle of the emitted light is fixed, and the lighting effect is simple. In order to make the lamp present lighting effects such as desired lighting angle and degree of light concentration, in a related art, a light distribution element is usually installed outside the LED to distribute light of the LED. Early light distribution element is usually a single light distribution element, that is, each LED or LED chip has an independent revolving light distribution element, and the LED chip is located in the middle position of the revolving light distribution element to make the light spot circular. When it is necessary to adjust the light emitting angle, there are usually two methods, one of which is to directly change light distribution configuration of the light distribution element, which is extremely costly. In order to save costs, the light emitting angle can be adjusted without changing the light distribution element by changing a distance between the LED chip and the light distribution element (Z-axis distance).

[0005] At a later stage, a ring-shaped light distribution element was gradually developed. One light distribution element can simultaneously distribute light for multiple LED chips arranged in a ring shape, and can also form a circular light spot. Considering that light of each LED chip can be uniformly distributed by the ring-shaped light distribution element, the LED chip is usually arranged on a center line of a light source cavity of the ring-shaped light distribution element. For such a ring-shaped light distribution element, when it is desired to adjust the light emitting angle without changing the light distribution configuration of the light distribution element, currently the above-mentioned method of changing the distance between the LED chip and the light distribution element (Z-axis distance) is also commonly used.

[0006] However, although the above method of adjusting angle does not need to change the light distribution configuration of the light distribution element, it requires additional structural members between the light source board and the light distribution element to adjust the Z-axis distance, and the structure is still relatively complicated. US 2010 / 123397 A1 describes an LED based omni-directional light engine including a toroidal lens coupled to a controller circuit board and two or more evenly spaced LEDs mounted to the controller circuit board. The toroidal lens includes an inner surface coated with a layer of reflection materials, an outer surface, and a flat base surface. The controller circuit board is electrically coupled to a power source. The LEDs are located directly under the flat base surface. The inner surface substantially reflects light beams emitted from the LEDs to the outer surface which refracts the beams to the omni-directions. CN 104 566 205 A discloses a lens and LED lamp using the lens. The lens is a ring-shaped lens which is arranged around a central axis and provided with a ring-shaped inner side surface and a ring-shaped outer side surface opposite to each other in the radial direction; the lens is provided with a light-in end and a light-out end opposite to each other in the direction of the central axis; an accommodating groove is formed in the light-in end; a light-in surface is formed on the groove wall of the accommodating groove; both the ring-shaped inner side surface and the ring-shaped outer side surface are total internal reflection surfaces and respectively formed in the way a first arc and a second arc rotate around the central axis for a circle; the light-in surface and the light-out surface are respectively formed in the way that a light-in section and a light-out section rotate around the central axis for a circle; the LED lamps are located at any position of the accommodating groove in the circumferential direction of the lens.SUMMARY

[0007] Embodiments of the present application provides an LED light distribution structure, a light source module and a lamp to solve the above problems.

[0008] The embodiments of the present application adopt the following technical solutions.

[0009] According to a first aspect the present invention provides an LED light distribution structure, which comprises a ring-shaped light distribution element and a plurality of LED chips; the ring-shaped light distribution element is provided with a light source cavity in a ring shape, and the light source cavity has a ring center and a center line surrounding the ring center in a ring shape; the plurality of LED chips are arranged in a ring shape in the light source cavity, each of the LED chips comprises an LED and a chip substrate, and the LED is on the chip substrate; and LEDs on all the LED chips are uniformly arranged along a ring-shaped wiring line, the ring-shaped wiring line is in a concentric ring with the center line, and the ring-shaped wiring line is located inside or outside of the center line.

[0010] In the above LED light distribution structure, the chip substrate has a center, and the LED is at the center or not at the center.

[0011] In the above LED light distribution structure, the center of the chip substrate is inside or outside the center line.

[0012] Optionally, in the above LED light distribution structure, the chip substrate has a horizontal axis and a vertical axis that pass through the center and are perpendicular to each other, the horizontal axis and the vertical axis divide the chip substrate into four quadrants, and at least most of the LEDs are located in one of the quadrants.

[0013] Optionally, in the above LED light distribution structure, the horizontal axis and the vertical axis are not perpendicular to a connection line from the ring center to the center.

[0014] Optionally, in the above LED light distribution structure, all the LED chips have the same posture relative to the ring center in a circumferential direction.

[0015] Optionally, in the above LED light distribution structure, the LED chip comprises a plurality of LEDs, and the plurality of LEDs are all on the chip substrate.

[0016] In the above LED light distribution structure according to the invention, the ring-shaped light distribution element is a ring-shaped refractive lens or a ring-shaped total reflection lens.

[0017] According to a second aspect the present invention provides a light source module, which comprises a light source board and the LED light distribution structure according to the first aspect of the invention; the LED chips are arranged on the light source board, and the ring-shaped light distribution element covers on the light source board.

[0018] According to a third aspect the present invention provides a lamp, which comprises a lamp body and at least one light source module according to the second aspect of the invention, the light source module is arranged on the lamp body.

[0019] The above at least one technical solution adopted in the embodiments of the present application can achieve the following beneficial effects.

[0020] The LED light distribution structure, the light source module, and the lamp provided by the embodiments of the present application can adjust the light emitting angle while maintaining the circular spot by changing the position of the LED relative to the center line of the light source cavity. This method of adjusting the light emitting angle does not require additional structural members between the light source board and the light distribution element, so the structure can be greatly simplified.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described here are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application, and do not constitute an improper limitation of the present application. The embodiments by which the center d of the chip substrate is on the center line b are not part of the claimed invention. In the drawings: FIG. 1 is a top assembly view of an LED light distribution structure with a center d on the center line b and an LED chip rotating with the center d as an axis until ring-shaped wiring lines c1 and c2 are located outside the center line b according to an embodiment of the present application which is excluded from the claimed invention; FIG. 2 is a top assembly view of an LED light distribution structure with the center d on the center line b and the ring-shaped wiring line c located outside the center line b according to an embodiment of the present application which is excluded from the claimed invention; FIG. 3 is a cross-sectional view of FIG. 2; FIG. 4 is a light distribution curve diagram of the LED light distribution structure provided in FIG. 2; FIG. 5 is a top assembly view of an LED light distribution structure with both the center d and the ring-shaped wiring line c located inside the center line b according to an embodiment of the present application; FIG. 6 is a cross-sectional view of FIG 5; FIG. 7 is a light distribution curve diagram of the LED light distribution structure provided in FIG. 5; FIG. 8 is a top assembly view of an LED light distribution structure with both the center d and the ring-shaped wiring line c located outside the center line b according to an embodiment of the present application; FIG. 9 is a cross-sectional view of FIG. 8; FIG. 10 is a light distribution curve diagram of the LED light distribution structure provided in FIG. 8; FIG. 11 is a top assembly view of an LED light distribution structure with the center d on the center line b and the ring-shaped wiring line c located inside the center line b according to an embodiment of the present application which is excluded from the claimed invention; FIG. 12 is a cross-sectional view of FIG. 11; FIG. 13 is a light distribution curve diagram of the LED light distribution structure provided in FIG. 11; FIG. 14 is a structural view of an LED chip including multiple LEDs provided by an embodiment of the present application; and FIG. 15 shows two postures of the LED chip provided by an embodiment of the present application. Reference signs:

[0022] 1- Ring-shaped light distribution element, 10- Light source cavity, 12- Light distribution part, 120- Light incident surface; 122- Light emitting surface, 124- Total reflection surface, 2- LED chip, 20- LED, 22- Chip substrate; a- Ring center, b- Center line, c- Ring-shaped wiring line, d- Center, e-Horizontal axis, f- Vertical axis. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions, and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely in conjunction with specific embodiments of the present application and the corresponding drawings. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

[0024] The technical solutions provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0025] Embodiments of the present application disclose an LED light distribution structure, as shown in FIG. 1 to FIG. 15, the LED light distribution structure includes a ring-shaped light distribution element 1 and a plurality of LED chips 2. The ring-shaped light distribution element 1 is provided with a light source cavity 10 in a ring shape, and the light source cavity 10 has a ring center a and a center line b surrounding the ring center in a ring shape. The ring-shaped light distribution element 1 further has a light distribution part 12, the light distribution part 12 is arranged around the light source cavity 10, and an interface between the light distribution part 12 and the light source cavity 10 is a light incident surface 120 of the light distribution part 12. After light enters the light distribution part 12 from the light incident surface 120, the light path can be adjusted by means of refraction or reflection, and the light finally exits from the light emitting surface 122 that is substantially opposite to the light incident surface 120. Generally, a radial cross section of the light source cavity 10 and the light distribution part 12 is an axisymmetric structure, and the axis intersects perpendicularly with the center line b. The ring-shaped light distribution element in this embodiment may be a ring-shaped refractive lens, or may also be a ring-shaped total reflection lens. A difference between the two types of lenses mainly lies in the structure of the light distribution part 12. The light distribution part 12 of the ring-shaped refractive lens distributes light according to the principle of light refraction of a concave lens or a convex lens, while the light distribution part 12 of the ring-shaped total reflection lens further adds a total reflection surface 124 based on the refraction, so as to present a light distribution effect different from that of the ring-shaped refractive lens.

[0026] A plurality of LED chips 2 are arranged in a ring shape in the light source cavity 10, the LED chip 2 includes an LED 20 and a chip substrate 22; and the LED 20 is arranged on the chip substrate 22. The LEDs 20 on all the LED chips 2 are uniformly arranged along a ring-shaped wiring line c; the ring-shaped wiring line c is in a concentric ring with a center line b. Depending on a required light emitting angle, the ring-shaped wiring line c may be located inside the center line b (referring to FIGS. 2, 3, 5, 6, 11 and 12), or it may be located outside the center line (referring to FIGS. 1, 7 and 8). When the light emitting angle needs to be increased, the ring-shaped wiring line c will be located inside the center line b; in this case, the light distribution part 12 will have a polarization effect on the light of the LED 20, and the light emitted by the LED 20 will be more emitted by the light distribution part 12 to a side away from the ring center a, so the overall LED light distribution structure may have a larger light emitting angle. Conversely, when the light emitting angle needs to be reduced, the ring-shaped wiring line c will be located outside the center line b; in this case, the light emitted by the LED 20 will be more emitted by the light distribution part 12 to the side facing the ring center a, so the LED light distribution structure as a whole may have a smaller light emitting angle.

[0027] Moreover, although a single LED 20 will be in a situation of polarized light distribution after the above-described adjustment, since the LEDs 20 are all located on a same ring-shaped wiring line c, polarized light distribution effect of each LED 20 may be kept consistent; and with respect to the overall light emitting effect of all the LEDs 20, the overall circular light spot may still be guaranteed.

[0028] With respect to the light source module that implements the above-described LED light distribution structure, the LED chips 2 of the above-described LED light distribution structure may be directly arranged on a light source board (not shown), and the ring-shaped light distribution element 1 may cover the light source board, so as to implement the corresponding light distribution effect, without additionally providing other structural members in the module structure. Therefore, compared with the adjustment structure in the related art, the LED light distribution structure provided by this embodiment may more simplify the structure of the light source module.

[0029] In production practice, the chip substrate 22 usually has a center d; the center d may refer to a geometric center of the chip substrate 22; when the chip substrate 22 has a circular, square, or other similar shape, it has a geometric center. In addition, the center may also refer to the center of various forms such as a size center or a vertical center of the chip substrate. The center d is usually arranged at the position of the center line b of the light source cavity 10 in the related art.

[0030] In this embodiment, depending on the model of the LED chip 2, the LED 20 may be located at the above-described center d, or may not be located at the above-described center d. For LED chips 2 of different structures, different structural forms may be adopted.

[0031] As shown in FIGS. 1, 2, 3, 11 and 12, when the LED 20 is not located at the center d of the chip substrate 22, the center d of the chip substrate 22 may be located on the center line b. In this case, the LED 20 is located at an off-center position. By rotating the LED chip 2 with the center d as an axis, the LED 20 will rotate around the center d, thereby implementing adjustment of the position of the LED 20. In this case, it is only necessary to control all the LEDs to be located in a same ring-shaped wiring line c to implement adjustment of the light emitting angle. Referring to FIG. 4 and FIG. 13, taking Qingzhi 60° floodlight as an example and choosing OSRAM3030 as LED, by rotating the LED chip 2 with the center d as the axis, a beam angle may be adjusted within a range of 60° (FIG. 4) to 86° (FIG. 13).

[0032] When the LED 20 is located at the center d of the chip substrate 22, the position of the entire LED chip 2 may be directly adjusted, so that the center d of the chip substrate 22 is located inside or outside the center line b, while keeping the original posture of the LED chip 2 unchanged, so that the position of the LED 20 may still be adjusted. Moreover, such an adjustment mode may also be applied to a case where the LED 20 is not located at the center d of the chip substrate 22 (referring to FIGS. 2 to 10). Referring to FIGS. 4, 7 and 10, also taking Qingzhi 60° floodlight as an example and choosing OSRAM3030 as LED, in a posture that the LEDs 20 on the LED chip 2 are all located on a side of the chip substrate 22 away from the center d, by adjusting the position of the LED chip 2, the beam angle may be adjusted within a range of 54° (FIG. 10) to 70° (FIG. 7).

[0033] Through the above-described two adjustment modes, the beam angle may be adjusted within the range of 54° to 86°. In some other embodiments, the above-described two adjustment modes may also be applied to the LED chip 2 whose LED 20 is not located at the center d of the chip substrate 22 at the same time, that is, on the one hand, changing the position of the center of the chip substrate 22, so that the position of the center is located inside or outside the center line b, and on the other hand, rotating the LED chip 2 with the center d as the axis to further change the position of the LED 20. In this way, a larger angle adjustment range may be obtained.

[0034] In order to coordinate position adjustment or rotation of the LED chip 2, it is usually necessary to accordingly adjust a bonding pad corresponding to the LED chip 2 on the light source board, to adjust the position or posture of the bonding pad to be consistent with the LED chip 2. In some cases, due to limitation of circuit arrangement on the light source board, the light source board may not be able to adopt a single adjustment mode to adjust the bonding pad; however, the solution of applying the two adjustment modes at the same time gives the light source board more wiring options, which is favorable for reasonable wiring of the light source board, and reducing difficulty of wiring and processing of the light source board.

[0035] With respect to the adjustment mode of rotating the LED chip 2 with the center d as the axis, due to difference in rotation directions, in most cases, the LED 20 may either be rotated clockwise until it is located in the ring-shaped wiring line c, or may be rotated counterclockwise until it is located in the ring-shaped wiring line c, so as to form two different postures (referring to FIG. 15). Although distances between the LED 20 and the ring center a or the center line b are the same in these two postures, there will still be some shifts in the position of the light spot formed by the LED 20 due to position difference in the circumferential direction of the ring. These shifts may cause uneven brightness distribution of the overall light spot. Therefore, in order to make brightness distribution of the light spot relatively uniform, in this embodiment, it is preferable that the postures of all the LED chips 2 are kept consistent in the circumferential direction relative to the ring center a. In this way, while changing the position of the LED 20 relative to the ring center a or the center line b, all the LEDs 20 may move a same distance along the circumferential direction in a same direction to ensure that their spacing does not change, thereby ensuring uniform brightness distribution.

[0036] With respect to the adjustment mode of this embodiment, it is more applicable to the LED chip 2 with a structure below. As shown in FIG. 14, the chip substrate 22 of the LED chip 2 has a horizontal axis e and a vertical axis f that pass through the center d and are perpendicular to each other; the horizontal axis e and the vertical axis f divide the chip substrate 22 into four quadrants; and the number of LED 20 included in the LED chip 2 may be only one, or a plurality of LEDs may be included at the same time. No matter which solution is adopted, with respect to the LED(s) 20 as a whole, at least most of the LEDs 20 are located in one of the quadrants, and there may be a small part of the LEDs 20 located in adjacent or even opposite other quadrants. Such kind of LED chip 2 may be based on the horizontal axis e and the vertical axis f, which is more convenient for technicians to adjust the position of the LED 20. As shown in FIG. 1, in some embodiments, both the horizontal axis e and the vertical axis f may not be perpendicular to a connection line from the ring center a to the center d, but at a certain angle (referring to FIG. 1).

[0037] When the LED chip 2 includes a plurality of LEDs 20, these LEDs 20 may be located in a same ring-shaped wiring line c, but it is more likely that LEDs 20 located in a same position are located in a same ring-shaped wiring line c, and LEDs 20 located in different positions are located in different ring-shaped wiring lines c, thereby forming a plurality of ring-shaped wiring lines c1 and c2.

[0038] The light source module provided by this embodiment may be arranged on the lamp body while it is arranged inside the lamp. In addition, according to different light efficiency requirements, a plurality of light source modules may be arranged in a planar array or in a concentric ring form in the same lamp at the same time. The light source boards of these light source modules may be independent of each other or integrated into a whole.

[0039] In summary, the LED light distribution structure, the light source module, and the lamp provided by the embodiments of the present application may greatly simplify the structure.

[0040] The above embodiments of the present application are only focused on describing differences between the respective embodiments, different optimized features of the respective embodiments may be combined to form a more preferred embodiment as long as there is no conflict, and no details will be repeated here in consideration of text conciseness.

[0041] The above are only embodiments of the present application, and not intended to limit the present application. For those skilled in the art, various changes and modifications may be made to the present application.

Claims

1. An LED light distribution structure, comprising: a ring-shaped light distribution element (1) and a plurality of LED chips (2); wherein the ring-shaped light distribution element (1) is provided with a light source cavity (10) in a ring shape, and the light source cavity (10) has a ring center and (a) a center line (b) surrounding the ring center (a) in a ring shape; and wherein the ring-shaped light distribution element (1) is a ring-shaped refractive lens or a ring-shaped total reflection lens; the plurality of LED chips (2) are arranged in a ring shape in the light source cavity (10), each of the LED chips (2) comprises an LED (20) and a chip substrate (22), and the LED (20) is on the chip substrate (22); wherein the LEDs (20) on all the LED chips (2) are uniformly arranged along a ring-shaped wiring line (c), the ring-shaped wiring line (c) is in a concentric ring with the center line (b), and the ring-shaped wiring line (c) is located inside or outside of the center line (b), wherein the chip substrate (22) has a center (d), and the LED (20) is at the center (d) or not at the center (d) characterized in that the center (d) of the chip substrate (22) is inside or outside the center line (b).

2. The LED light distribution structure according to claim 1, wherein the chip substrate (22) has a horizontal axis (e) and a vertical axis (f) that pass through the center (d) and are perpendicular to each other, the horizontal axis (e) and the vertical axis (f) divide the chip substrate (22) into four quadrants, and at least most of the LEDs (20) are located in one of the quadrants.

3. The LED light distribution structure according to claim 2, wherein the horizontal axis (e) and the vertical axis (f) are not perpendicular to a connection line from the ring center (a) to the center (d).

4. The LED light distribution structure according to claim 1, wherein all the LED chips (2) have the same posture relative to the ring center (a) in a circumferential direction.

5. The LED light distribution structure according to claim 1, wherein the LED chip (2) comprises a plurality of LEDs (20), and the plurality of LEDs (20) are all on the chip substrate (22).

6. A light source module, comprising a light source board and the LED light distribution structure according to any one of claims 1 to 5, wherein the LED chips (2) are arranged on the light source board, and the ring-shaped light distribution element (1) covers on the light source board.

7. A lamp, comprising a lamp body and at least one light source module according to claim 6, wherein the light source module is arranged on the lamp body.