Lighting device

Abstract

A light-emitting device includes a substrate, a light-emitting element, and a lens sealing member. The light-emitting element is disposed on the substrate and configured to emit light. The lens sealing member is disposed on the substrate and seals the light-emitting element. The lens sealing member defines a central axis which is perpendicular to the substrate. The lens sealing member includes an upper surface and a lower surface. The upper surface has a central concave surface, a reflective surface and a convex surface. The reflective surface is connected between the central concave surface and the convex surface, the reflective surface is continuously connected to the convex surface at a top end portion, and the lower surface is located on the substrate.

Description

Technical Field

[0001] This disclosure relates to a light-emitting device, and more particularly to a light-emitting device that can increase the light-emitting angle. Prior Technology

[0002] With the development of technology, many light-emitting devices equipped with light-emitting diodes are now quite common and popular products.

[0003] Generally, to achieve a wider light emission angle, an optical lens is placed on the light-emitting diode (LED). The shape of this optical lens is designed to allow the light emitted by the LED to have a wider angle. However, optical lenses are expensive and require more equipment to correctly mount them on the LED, thus increasing the complexity and time of the manufacturing process.

[0004] Therefore, how to design a light-emitting device that can increase the light emission angle and has a lower cost is a topic worthy of discussion and solution. Summary of the Invention

[0005] In view of this, this disclosure proposes a light-emitting device to solve the above-mentioned problems.

[0006] This disclosure provides a light-emitting device, including a substrate, a light-emitting element, and a lens sealing portion. The light-emitting element is disposed on the substrate and configured to emit light. The lens sealing portion is disposed on the substrate and seals the light-emitting element. The lens sealing portion defines a central axis perpendicular to the substrate. The lens sealing portion includes an upper surface and a lower surface. The upper surface has a centrally recessed surface, a reflective surface, and a convex surface. The reflective surface connects the centrally recessed surface and the convex surface and is continuously connected to the convex surface at a top end. The lower surface is located on the substrate. When viewed along a first axial direction perpendicular to the central axis, the centrally recessed surface has a recess depth along the central axis, the light-emitting element has a first height along the central axis, the distance between the top end and the substrate corresponds to a second height along the central axis, and the ratio of the second height to the recess depth is between 2.5 and 4.5.

[0007] According to some embodiments disclosed herein, the light-emitting element emits a light ray, part of which is emitted through a central recessed surface and part of which is completely reflected by a reflective surface.

[0008] According to some embodiments disclosed herein, a portion of this light is emitted directly through the convex surface.

[0009] According to some embodiments disclosed herein, when viewed along a first axial direction, the reflective surface has a first arcuate portion and the convex surface has a second arcuate portion. The first arcuate portion and the second arcuate portion are continuous arcuate surfaces, and the first arcuate portion and the second arcuate portion intersect at one of the apex vertices of the top portion.

[0010] According to some embodiments disclosed herein, the lens sealing portion further has a concave surface connected between the convex surface and the lower surface at a transition portion, and the concave surface is connected to the substrate at a contact portion, wherein when viewed along the first axial direction, the concave surface has a third arcuate portion, the third arcuate portion intersecting the second arcuate portion at a transition point of the transition portion, and the third arcuate portion intersecting the substrate at a contact point of the contact portion.

[0011] According to some embodiments disclosed herein, the light-emitting element is defined with a center point, a central axis passes through the center point, a first line is defined connecting the center point and the vertex, the first line forms a first angle with the central axis, and the first angle is less than or equal to 42.5 degrees.

[0012] According to some embodiments disclosed herein, a second line is defined connecting the center point and the turning point, and a second angle is formed between the second line and the central axis, wherein the second angle is greater than 42.5 degrees and less than or equal to 80 degrees.

[0013] According to some embodiments disclosed herein, when viewed along a first axial direction, the center point forms a projection point on a third arcuate surface along a second axial direction, and the second axial direction is perpendicular to the first axial direction. A third line is defined between the center point and the projection point, and a third angle is formed between the third line and the central axis, and the third angle is greater than 80 degrees and less than or equal to 90 degrees.

[0014] According to some embodiments disclosed herein, when viewed along the central axis, the contact portion has a first circular structure and the top portion has a second circular structure, wherein the first circular structure has a first diameter, the second circular structure has a second diameter, and the first diameter is larger than the second diameter.

[0015] According to some embodiments disclosed herein, the light-emitting element has a width along a second axis and a second diameter greater than the width, wherein the second axis is perpendicular to the first axis and the ratio of the first diameter to the width is between 12 and 14.

[0016] According to some embodiments disclosed herein, when viewed along the central axis, the central recessed surface has a third circular structure, the third circular structure having a third diameter and a width greater than the third diameter.

[0017] According to some embodiments disclosed herein, the reflective surface intersects the central recessed surface at a central periphery, and when viewed along a first axis, the curvature of the first arcuate surface gradually decreases from one of the peripheral points of the central periphery to the apex.

[0018] According to some embodiments disclosed herein, when viewed along a first axis, the curvature of the second arcuate surface gradually decreases from the inflection point to the apex.

[0019] According to some embodiments disclosed herein, when viewed along the first axis, the curvature of the third arcuate surface gradually decreases to 0 from the inflection point to the contact point.

[0020] According to some embodiments disclosed herein, the third arcuate portion has a first arcuate segment and a second arcuate segment. When viewed along a second axial direction, the light-emitting element overlaps the second arcuate segment but not the first arcuate segment, wherein the second axial direction is perpendicular to the first axial direction.

[0021] According to some embodiments disclosed herein, a portion of this light beam is emitted via a second arcuate segment.

[0022] According to some embodiments disclosed herein, when viewed along a first axial direction, the first arcuate facet is asymmetrical to the second arcuate facet.

[0023] According to some embodiments disclosed herein, the recess depth is greater than the first height, and the ratio of the second height to the first height is between 7.8 and 10.

[0024] This disclosure provides a light-emitting device, including a substrate, a light-emitting element, and a lens sealing portion. The light-emitting element is disposed on the substrate, and the lens sealing portion seals the light-emitting element. The lens sealing portion may have a central recessed surface, a reflective surface, a convex surface, and a concave surface. The central recessed surface is planar, and the reflective surface is arc-shaped and connected to the central recessed surface at a central peripheral portion.

[0025] The reflective surface and the convex surface are a continuous arc, and the reflective surface and the convex surface are connected at a top end. The concave surface and the convex surface are continuously connected at a turning point, and a portion of the concave surface contacts the substrate. The lens sealing part is an integrally formed optical lens, and the light-emitting element directly contacts the lens sealing part and is completely enclosed within it, with no gap between them. Based on the configuration of the lens sealing part and the light-emitting element disclosed herein, the emission angle of the light-emitting device can be effectively improved to achieve a wider light distribution emission effect. Simple Explanation of the Diagram

[0026] This disclosure will become clear through the following detailed description and accompanying illustrations. It should be emphasized that, in accordance with industry standard practice, the features are not drawn to scale and are for illustrative purposes only. In fact, the dimensions of the features may be arbitrarily enlarged or reduced for clarity. Figure 1 is a perspective view of a light-emitting module 10 according to an embodiment of the present disclosure. Figure 2 is a perspective view of a lens sealing portion 106 according to one embodiment of the present disclosure. Figure 3A is a schematic cross-sectional view of a light-emitting device 100 according to an embodiment of the present disclosure along line segment AA in Figure 1. Figure 3B is an enlarged cross-sectional schematic diagram of a light-emitting element 104 according to an embodiment of the present disclosure. Figure 3C is an enlarged cross-sectional schematic diagram of a light-emitting element 104 according to another embodiment of the present disclosure. Figure 4 is a schematic diagram showing the variation of the tangent angle of a reflective surface 110 according to an embodiment of the present disclosure. Figure 5 is a schematic diagram showing the change of the tangent angle of the convex surface 112 according to an embodiment of the present disclosure. Figure 6 is a schematic diagram showing the variation of the tangent angle of the concave surface 116 according to an embodiment of the present disclosure. Figure 7 is a schematic diagram of the path of light emitted by the light-emitting element 104 according to an embodiment of the present disclosure. Figure 8A is a schematic diagram of the emission angle of a conventional light-emitting diode. Figure 8B is a schematic diagram of the light emission angle of a conventional light-emitting device (with a lens). Figure 8C is a schematic diagram of the light emission angle of a light-emitting device 100 according to an embodiment of the present disclosure. Figure 9A is a color schematic diagram of the illuminance of a conventional light-emitting diode. Figure 9B is a color diagram illustrating the illuminance of a conventional light-emitting device (with a lens). Figure 9C is a color schematic diagram of the illuminance of a light-emitting device 100 according to an embodiment of the present disclosure. Figure 10A shows the illuminance distribution of a conventional light-emitting diode along the X-axis. Figure 10B shows the illuminance distribution of a conventional light-emitting device (with a lens) along the X-axis. Figure 10C is an illuminance distribution diagram of a light-emitting device 100 according to an embodiment of the present disclosure in the X-axis direction. Figure 11A is a schematic diagram showing the proportions of different light spot sizes under the condition of 10% of the maximum illuminance. Figure 11B is a schematic diagram showing the proportions of different light spot sizes under 50% of the maximum illuminance. Figure 11C is a schematic diagram showing the proportions of different light spot sizes under 90% of the maximum illuminance. Implementation

[0027] The following discloses many different implementations or examples to implement different features of the provided object. Specific embodiments of the elements and their arrangements are described below to illustrate this disclosure. Of course, these embodiments are merely illustrative and should not be construed as limiting the scope of this disclosure. For example, the specification mentions that a first feature is formed on a second feature. This may include embodiments where the first and second feature are in direct contact, or embodiments where there are other features between the first and second feature; in other words, the first and second feature are not in direct contact.

[0028] Furthermore, repeated reference numerals or designations may be used in different embodiments. These repetitions are merely for the purpose of clearly and simply describing this disclosure and do not represent a specific relationship between the different embodiments and / or structures discussed. Additionally, the formation, connection, and / or coupling to another feature component in this disclosure may include embodiments in which the feature components are formed in direct contact, and may also include embodiments in which additional feature components may be formed to insert into the aforementioned feature component, such that the aforementioned feature components may not be in direct contact. Furthermore, spatially related terms may be used, such as “vertical,” “above,” “up,” “below,” “bottom,” and similar terms (e.g., “downward,” “upward,” etc.). These spatially related terms are used to facilitate the description of the relationship between one element(s) or feature(s) in the illustrations and another element(s) or feature(s), and these spatially related terms are intended to cover different orientations of the device including the feature.

[0029] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the relevant technology and the context of this disclosure, and should not be interpreted in an idealized or overly formal manner, unless specifically defined herein.

[0030] Furthermore, the use of ordinal numbers such as "first" and "second" in the specification and claims to modify the elements of the claims does not imply or represent any prior ordinal number of the claimed element, nor does it represent the order of one claimed element with another, or the order of manufacturing methods. The use of such ordinal numbers is only to enable a claimed element with a certain name to be clearly distinguished from another claimed element with the same name.

[0031] Furthermore, in some embodiments disclosed herein, terms such as "connection" and "interconnection," unless specifically defined, may refer to two structures being in direct contact, or to two structures not being in direct contact, with other structures disposed between them. Moreover, these terms regarding joining and connection may also include situations where both structures are movable or both structures are fixed.

[0032] Please refer to Figures 1 through 3C. Figure 1 is a perspective view of a light-emitting module 10 including a light-emitting device 100 according to an embodiment of the present disclosure. Figure 2 is a perspective view of a lens sealing portion 106 according to an embodiment of the present disclosure. Figure 3A is a cross-sectional view of the light-emitting device 100 according to an embodiment of the present disclosure along line segment AA in Figure 1. Figure 3B is an enlarged cross-sectional view of a light-emitting element 104 according to an embodiment of the present disclosure. Figure 3C is an enlarged cross-sectional view of a light-emitting element 104 according to an embodiment of the present disclosure. As shown in Figure 1, the light-emitting module 10 may include a substrate 102 and a plurality of light-emitting devices 100, and the light-emitting devices 100 are located on the substrate 102. Each light-emitting device includes a light-emitting element 104 and a lens sealing portion 106.

[0033] These light-emitting elements 104 are disposed on the substrate 102 and configured to emit light. These light-emitting elements 104 may be, for example, light-emitting diode chips, light-emitting diode packages (LED packages), or chip-scale packaged LEDs (CSP LEDs), but are not limited to these. The lens sealing portion 106 may be a light-transmitting element, such as an optical lens, which is disposed on the substrate 102 and seals the light-emitting elements 104. That is, the lens sealing portion 106 is in complete contact with the light-emitting elements 104, and there is no gap between the light-emitting elements 104 and the lens sealing portion 106. In some embodiments, the lens sealing portion 106 is manufactured by compression molding, controlling the shape of each lens sealing portion 106 to be consistent. In some embodiments, transparent materials such as polymethyl methacrylate (PMMA), polycarbonate (PC), or polyethylene terephthalate (PET) are compression molded into a molding optic lens. Furthermore, the light-emitting elements 104 are directly sealed during the lens compression molding process.

[0034] As shown in Figure 2, the lens sealing portion 106 may include an upper surface 1061 and a lower surface 1063. The upper surface 1061 may have a centrally recessed surface 108, a reflective surface 110, and an outwardly convex surface 112. As shown in Figures 2 and 3A, the centrally recessed surface 108 is a plane, the reflective surface 110 is connected between the centrally recessed surface 108 and the outwardly convex surface 112, and the reflective surface 110 is continuously connected to the outwardly convex surface 112 at a top end 114. The centrally recessed surface 108 is used to allow at least a portion of the light rays emitted from directly above the light-emitting element 104 to be emitted.

[0035] In this embodiment, the lower surface 1063 is located on the substrate 102. As shown in Figures 2 and 3A, the surface of the lens sealing part 106 that contacts the substrate 102 is the lower surface 1063.

[0036] As shown in Figure 3A, the lens sealing portion 106 may define a central axis CX, which is perpendicular to the substrate 102, and when viewed along a first axis AX1 (Y-axis) perpendicular to the central axis CX, the central recessed surface 108 has a recess depth DT1 on the central axis CX.

[0037] Furthermore, the light-emitting element 104 has a first height HT1 in the direction of the central axis CX, and the top part 114 and the substrate 102 have a second height HT2 in the direction of the central axis CX (Z axis), and the ratio of the second height HT2 to the recess depth DT1 is between 2.5 and 4.5.

[0038] In addition, the depression depth DT1 is greater than the first height HT1, and the ratio of the second height HT2 to the first height HT1 is between 7.8 and 10.

[0039] As shown in Figure 3A, when viewed along the first axis AX1, the reflective surface 110 has a first arcuate surface 1101, the convex surface 112 has a second arcuate surface 1121, and the first arcuate surface 1101 and the second arcuate surface 1121 are continuous arcuate surfaces.

[0040] Specifically, the first arcuate portion 1101 and the second arcuate portion 1121 intersect continuously at one of the apex 115 of the apex portion 114. It is noteworthy that, when viewed along the first axis AX1, the first arcuate portion 1101 is asymmetrical to the second arcuate portion 1121. For example, when viewed along the first axis AX1, the arc length of the first arcuate portion 1101 is less than the arc length of the second arcuate portion 1121.

[0041] Next, please refer to Figures 2 and 3A. In this embodiment, the lens sealing portion 106 may further have a concave surface 116 connected between the convex surface 112 and a turning portion 118 and a lower surface 1063, and the concave surface 116 is connected to the substrate 102 at a contact portion 120.

[0042] As shown in Figure 3A, when viewed along the first axial direction AX1, the concave surface 116 has a third arcuate surface 1161, which intersects the second arcuate surface 1121 at a turning point 119 of the turning portion 118, and the third arcuate surface 1161 intersects the substrate 102 at a contact point 121 of the contact portion 120.

[0043] The third arcuate portion 1161 has a first arcuate segment 1163 and a second arcuate segment 1164. When viewed along a second axis AX2, the light-emitting element 104 overlaps with the second arcuate segment 1164 but not with the first arcuate segment 1163. The second axis AX2 is perpendicular to the first axis AX1.

[0044] As shown in Figure 3A, the light-emitting element 104 may have a center point CTP, and the central axis CX passes through the center point CTP. The center point CTP and the vertex 115 may be connected by a first line CNL1, and the first line CNL1 and the central axis CX form a first angle AG1, which is less than or equal to 42.5 degrees.

[0045] Similarly, as shown in Figure 3A, a second line CNL2 can be defined between the center point CTP and the turning point 119. The second line CNL2 forms a second angle AG2 with the central axis CX, and the second angle AG2 is greater than 42.5 degrees and less than or equal to 80 degrees.

[0046] Furthermore, as shown in Figure 3A, when viewed along the first axis AX1, the center point CTP forms a projection point PJP on the third arcuate surface 1161 along the direction of the second axis AX2, and the aforementioned first arcuate segment 1163 and second arcuate segment 1164 intersect at the projection point PJP.

[0047] Similarly, a third line CNL3 can be defined between the center point CTP and the projection point PJP. The third line CNL3 and the central axis CX form a third angle AG3, and the third angle AG3 is greater than 80 degrees and less than or equal to 90 degrees.

[0048] Furthermore, as shown in Figure 2, when viewed along the central axis CX, the contact portion 120 has a first circular structure, and the top portion 114 has a second circular structure. As shown in Figure 3A, the first circular structure has a first diameter DD1, the second circular structure has a second diameter DD2, and the first diameter DD1 is larger than the second diameter DD2.

[0049] The light-emitting element 104 has a width WT1 on the second axis AX2, and the second diameter DD2 is greater than the width WT1, and the ratio of the first diameter DD1 to the width WT1 is between 12 and 14.

[0050] In this embodiment, the reflective surface 110 and the central recessed surface 108 intersect at a central peripheral portion 107. As shown in Figures 2 and 3A, when viewed along the central axis CX, the central recessed surface 108 is defined by the central peripheral portion 107, and the central recessed surface 108 has a third circular structure. The third circular structure has a third diameter DD3, and the width WT1 of the light-emitting element 104 is greater than the third diameter DD3.

[0051] As shown in Figure 3B, the light-emitting element 104 includes a solid-state semiconductor light source 1040 and a wavelength conversion section 1041. In some embodiments, the solid-state semiconductor light source 1040 may be a flip-chip blue light-emitting diode (LED) chip or a UV light-emitting diode (LED) chip. In some embodiments, the light-emitting element 104 may be a chip-scale package (CSP), and the wavelength conversion section 1041 is conformally formed on the surface of the LED chip (solid-state semiconductor light source 1040) to conform to the shape of the LED chip, covering its top and side surfaces. In other embodiments, the wavelength conversion section 1041 may only cover the top surface of the LED chip (solid-state semiconductor light source 1040). In some embodiments, the LED chip includes sub-millimeter LED (mini LED) chips and micro LED (micro LED) chips. In an embodiment where the light-emitting element 104 emits white light, the solid-state semiconductor light source 1040 can be a blue light-emitting diode chip to emit blue light. The wavelength conversion unit 1041 includes a mixture of red light conversion material and green light conversion material, wherein the red light conversion material and the green light conversion material absorb part of the blue light and emit red light and green light respectively, and the red light and green light are mixed with the remaining blue light to form white light. In another embodiment where the light-emitting device emits white light, when the solid-state semiconductor light source 1040 is a UV light-emitting diode chip, the wavelength conversion unit 1041 includes a mixture of blue light conversion material, red light conversion material and green light conversion material, wherein the blue light conversion material, red light conversion material and green light conversion material absorb part of the ultraviolet light and emit blue light, red light and green light respectively, and then the three lights (blue, red and green) are mixed to form white light. Furthermore, red light conversion materials may include red quantum dots or red phosphors, and red phosphors may be, for example, (Sr,Ca)AlSiN3:Eu2+, Ca2Si5N8:Eu2+, Sr(LiAl3N4):Eu2+, manganese-doped red fluoride phosphors (e.g., K2GeF6:Mn4+, K2SiF6:Mn4+, K2TiF6:Mn4+), etc., but this disclosure is not limited to these. Blue light conversion materials may be blue quantum dots or blue phosphors, but this disclosure is not limited to these. Green light conversion materials may include green quantum dots or green phosphors, and green phosphors may be, for example, lumbrotium aluminum garnet (LuAG) phosphors, yttrium aluminum garnet (YAG) phosphors, β-SiAlON phosphors, silicate phosphors, but this disclosure is not limited to these.

[0052] In some implementations, the quantum dots can be cadmium-based quantum dots, such as cadmium sulfide (CdS) quantum dots, cadmium selenide (CdSe) quantum dots, cadmium telluride (CdTe) quantum dots, cadmium sulfide / zinc sulfide (CdS / ZnS) quantum dots, cadmium selenide / zinc sulfide (CdSe / ZnS) quantum dots, etc.; or, alloy structure quantum dots with cadmium sulfide (CdS), cadmium selenide (CdSe), or cadmium telluride (CdTe) as the core; or, core-shell structure quantum dots with cadmium sulfide (CdS), cadmium selenide (CdSe), or cadmium telluride (CdTe) as the core, but this disclosure is not limited to these.

[0053] In some implementations, the quantum dots may be cadmium-free quantum dots, such as zinc selenide (ZnSe) quantum dots, indium phosphide (InP) quantum dots, lead sulfide (PbS) quantum dots, copper indium sulfide (CuInS 2) quantum dots, zinc oxide (ZnO) quantum dots, and perovskite quantum dots (such as CsPbCl 3 quantum dots, CsPbBr 3 quantum dots, and CsPhI 3 quantum dots), but this disclosure is not limited to these.

[0054] As shown in Figure 3C, the light-emitting element 104 includes the aforementioned solid-state semiconductor light source 1040. In some embodiments, the solid-state semiconductor light source 1040 may be a light-emitting diode chip, such as a blue LED chip, a green LED chip, or a red LED chip. For ease of explanation, Figure 3C uses a flip-chip blue LED chip for illustration, but this disclosure is not limited thereto.

[0055] Please refer to Figures 2 and 4. Figure 4 is a schematic diagram showing the change of the tangent angle of the reflective surface 110 according to an embodiment of this disclosure. When viewed along the first axis AX1, multiple tangents can be formed on the first arcuate surface 1101 within the range from one of the peripheral points 109 of the central peripheral portion 107 to the vertex 115, and the angles BG1 to BG4 formed between these tangents and the Z-axis gradually increase.

[0056] For example, the included angle BG1 is 35 degrees, the included angle BG2 is 51 degrees, the included angle BG3 is 62 degrees, and the included angle BG4 is 74 degrees, but it is not limited to these. That is, in the first arcuate surface 1101, the curvature from the peripheral point 109 to the vertex 115 gradually decreases.

[0057] Please refer to Figure 5, which is a schematic diagram of the variation of the tangent angle of the convex surface 112 according to an embodiment of the present disclosure. In this embodiment, when viewed along the first axial direction AX1, multiple tangents can be formed on the second arcuate surface 1121 within the range from the turning point 119 to the vertex 115, and the angles CG1 to CG6 formed between these tangents and the Z-axis gradually increase.

[0058] For example, the included angle CG1 is 11 degrees, the included angle CG2 is 20 degrees, the included angle CG3 is 33 degrees, the included angle CG4 is 45 degrees, the included angle CG5 is 56 degrees, and the included angle CG6 is 67 degrees, but not limited to these. That is, in the second arcuate surface 1121, the curvature from the turning point 119 to the vertex 115 gradually decreases.

[0059] Please refer to Figure 6, which is a schematic diagram showing the change of the tangent angle of the concave surface 116 according to an embodiment of this disclosure. In this embodiment, when viewed along the first axial direction AX1, multiple tangents can be formed on the third arcuate surface 1161 within the range from the turning point 119 to the contact point 121, and the angles DG1 to DG4 formed between these tangents and the X-axis gradually decrease.

[0060] For example, the included angle DG1 is 34 degrees, the included angle DG2 is 25 degrees, the included angle DG3 is 16 degrees, and the included angle DG4 is 9 degrees, but it is not limited to these. That is, in the third arc surface 1161, the curvature from the turning point 119 to the contact point 121 gradually decreases to 0.

[0061] Please refer to Figures 2 and 7. Figure 7 is a schematic diagram of the path of some of the light emitted by the light-emitting element 104 according to an embodiment of the present disclosure. As shown in Figure 7, the light-emitting element 104 emits a plurality of light rays, a portion of which are emitted through the central recessed surface 108. Specifically, as shown in Figure 7, the first light ray LT1 emitted by the light-emitting element 104 can pass directly through the central recessed surface 108.

[0062] Furthermore, a portion of these rays are reflected by the reflective surface 110 to the convex surface 112 and then emitted. Specifically, as shown in Figure 7, a second ray LT2 emitted by the light-emitting element 104 strikes the reflective surface 110 and is then totally reflected by the reflective surface 110.

[0063] It is worth noting that the second ray LT2, which is totally internalized, is not emitted from the convex surface 112. As shown in Figure 7, the second ray LT2 is reflected from the reflective surface 110 to the convex surface 112, and then reflected by the convex surface 112 to the substrate 102. Finally, the substrate 102 reflects the second ray LT2 again and emits it through the second arc segment 1164.

[0064] In addition, some of these rays are refracted directly through the convex surface 112. Specifically, as shown in Figure 7, a third ray LT3 emitted by the light-emitting element 104 is emitted directly through the convex surface 112 and is refracted after passing through the convex surface 112.

[0065] In addition, some of these rays are reflected by the second curved surface segment 1164 and the substrate 102 before being emitted from the second curved surface segment 1164. Specifically, as shown in Figure 7, a fourth ray LT4 emitted by the light-emitting element 104 is reflected sequentially by the second curved surface segment 1164 and the substrate 102 before being emitted from the second curved surface segment 1164.

[0066] Next, please refer to Figures 8A to 8C. Figure 8A is a schematic diagram of the light emission angle of a conventional light-emitting diode, Figure 8B is a schematic diagram of the light emission angle of a conventional light-emitting device (with a lens), and Figure 8C is a schematic diagram of the light emission angle of a light-emitting device 100 according to an embodiment of this disclosure. The origin O is the position of the light-emitting diode (e.g., light-emitting element 104).

[0067] As shown in Figure 8A, the light-emitting angle of the light-emitting diode without a lens is only between +65 degrees and -65 degrees, while as shown in Figure 8B, the light-emitting angle of a conventional light-emitting device with a lens is at most between +80 degrees and -80 degrees. As shown in Figure 8C, the light-emitting device 100 disclosed herein can have a light-emitting angle between +85 degrees and -85 degrees.

[0068] Therefore, it can be seen that, based on the configuration of the lens sealing part 106 and the light-emitting element 104 disclosed herein, the light emission angle of the light-emitting device 100 can be effectively improved to achieve a large light angle batwing light distribution characteristic and increase the light emission effect of the wide light. This helps the light-emitting device to be applied to thinner light-emitting modules.

[0069] Next, please refer to Figures 9A to 9C. Figure 9A is a color schematic diagram of the illuminance of a conventional light-emitting diode, Figure 9B is a color schematic diagram of the illuminance of a conventional light-emitting device (with a lens), and Figure 9C is a color schematic diagram of the illuminance of a light-emitting device 100 according to an embodiment of this disclosure.

[0070] In Figure 9A, the coordinate (0,0) is the position where the light-emitting element is placed. The illuminance distribution diagram below is the illuminance distribution in the X-axis direction, while the illuminance distribution diagram on the right is the illuminance distribution in the Y-axis direction. The same applies to Figures 9B and 9C.

[0071] As can be seen from Figure 9A, the light emitted by the light-emitting diode without a lens is concentrated in the center, while as shown in Figure 9B, the light emitted by the conventional light-emitting device with a lens is more extensive, but cannot reach the edges.

[0072] As for the configuration disclosed herein, as shown in Figure 9C, the angular range of the light emitted by the light-emitting device 100 disclosed herein can be further expanded, thereby achieving a better light-emitting effect.

[0073] Next, please refer to Figures 10A to 10C and Figures 11A to 11C. Figure 10A is an illuminance distribution diagram of a conventional light-emitting diode in the X-axis direction, Figure 10B is an illuminance distribution diagram of a conventional light-emitting device (with a lens) in the X-axis direction, and Figure 10C is an illuminance distribution diagram of a light-emitting device 100 according to an embodiment of this disclosure in the X-axis direction. Figure 11A is a schematic diagram showing the proportion of different spot sizes under 10% of the maximum illuminance, Figure 11B is a schematic diagram showing the proportion of different spot sizes under 50% of the maximum illuminance, and Figure 11C is a schematic diagram showing the proportion of different spot sizes under 90% of the maximum illuminance.

[0074] For example, as shown in Figures 10A to 10C and Figure 11A, under the condition of 10% of the maximum illuminance, the spot diameter of a conventional light-emitting diode is, for example, about 9.6 mm, the spot diameter of a conventional light-emitting device with a lens is, for example, about 27.6 mm, and the spot diameter of the light-emitting device 100 disclosed herein is, for example, about 49.2 mm.

[0075] Therefore, as shown in Figure 11A, the spot diameter of a conventional light-emitting device with a lens is 2.875 times that of a pure light-emitting diode, while the spot diameter of the light-emitting device 100 disclosed herein is 5.125 times that of a pure light-emitting diode.

[0076] Similarly, as shown in Figure 11B, under the condition of 50% of the maximum illuminance, the spot diameter of a conventional light-emitting device with a lens is 2.652 times that of a pure light-emitting diode, while the spot diameter of the light-emitting device 100 disclosed herein is 2.826 times that of a pure light-emitting diode.

[0077] Similarly, as shown in Figure 11C, under the condition of 90% maximum illuminance, the spot diameter of a conventional light-emitting diode is 2.833 times that of a pure light-emitting diode, while the spot diameter of the light-emitting device 100 disclosed herein is 3.021 times that of a pure light-emitting diode.

[0078] Therefore, as can be seen from Figures 11A to 11C, regardless of any illumination conditions, the light spot diameter of the light-emitting device 100 disclosed herein is larger than that of conventional light-emitting devices. That is, the range of light emitted by the light-emitting device 100 disclosed herein can be larger and more uniform, so as to achieve a better light-emitting effect.

[0079] In summary, this disclosure provides a light-emitting device 100, including a substrate 102, a light-emitting element 104, and a lens sealing portion 106. The light-emitting element 104 is disposed on the substrate 102, and the lens sealing portion 106 seals the light-emitting element 104. The lens sealing portion 106 may have a central recessed surface 108, a reflective surface 110, a convex surface 112, and a concave surface 116. The central recessed surface 108 is planar, and the reflective surface 110 is arc-shaped, connected to the central recessed surface 108 at a central peripheral portion 107.

[0080] The reflective surface 110 and the convex surface 112 form a continuous arc, and are connected at a top end 114. The concave surface 116 and the convex surface 112 are continuously connected at a turning point 118, and a portion of the concave surface 116 contacts the substrate 102. The lens sealing portion 106 is an integrally formed optical lens, and the light-emitting element 104 directly contacts and is completely enclosed within the lens sealing portion 106, with no gap between them. Based on the configuration of the lens sealing portion 106 and the light-emitting element 104 disclosed herein, the emission angle of the light-emitting device 100 can be effectively improved to achieve a wider light distribution emission effect.

[0081] While the embodiments and advantages of this disclosure have been presented above, it should be understood that anyone skilled in the art can make modifications, substitutions, and refinements without departing from the spirit and scope of this disclosure. Furthermore, the scope of protection of this disclosure is not limited to the processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps described in the specific embodiments of the specification. Anyone skilled in the art can understand from the content of this disclosure the current or future developments of processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps, as long as they can perform substantially the same function or obtain substantially the same results in the embodiments described herein, and can be used according to this disclosure. Therefore, the scope of protection of this disclosure includes the aforementioned processes, machines, manufacturing methods, material compositions, apparatuses, methods, and steps. In addition, each claim constitutes an individual embodiment, and the scope of protection of this disclosure also includes combinations of various claim claims and embodiments.

[0082] 10: Light-emitting module 100: Light-emitting device 102:Substrate 104: Light-emitting element 1040: Solid-state semiconductor light source 1041: Wavelength conversion section 106: Lens sealing part 1061: Upper surface 1063: Lower surface 107: Central Peripheral Department 108: Centrally recessed surface 109: Surrounding Points 110: Reflective surface 1101: First Arc Face 112: Convex surface 1121: Second Arc Face 114: Top part 115: Vertex 116: Concave surface 1161: Third Arc Face 1163: First arc segment 1164: Second arc segment 118: Turning point 119: Turning Point 120:Contact Department 121: Contact point AX1: First axial direction AX2: Second Axis CX: Central axis CTP: Center Point HT1: First Height HT2: Second Height DT1: Depth of depression CNL1: First Connection CNL2: Second connection CNL3: Third Connection AG1: First included angle AG2: Second included angle AG3: Third Angle BG1~BG4: Angle CG1~CG6: Angle DG1~DG4: Angle PJP: Projection point DD1: First diameter DD2: Second diameter DD3: Third diameter WT1: Width LT1: First Ray LT2: Second Ray LT3: Third Ray LT4: Fourth Ray X: X-axis Y: Y-axis Z: Z-axis

Claims

1. A light-emitting device, comprising: a substrate; a light-emitting element disposed on the substrate and configured to emit light; and a lens sealing portion disposed on the substrate and sealing the light-emitting element, wherein the lens sealing portion defines a central axis perpendicular to the substrate; wherein the lens sealing portion includes an upper surface and a lower surface, wherein the upper surface has a centrally recessed surface, a reflective surface, and a convex surface, the reflective surface being connected between the centrally recessed surface and the convex surface, and the reflective surface being continuously connected to the convex surface at a top end, and the lower surface being located on the substrate; wherein, When viewed along a first axial direction perpendicular to the central axis, the central recessed surface has a recessed depth on the central axis, the light-emitting element has a first height on the central axis, the distance between the top end and the substrate corresponds to a second height on the central axis, and the ratio of the second height to the recessed depth is between 2.5 and 4.

5. When viewed along the first axial direction, the reflective surface has a first arcuate portion and the convex surface has a second arcuate portion. The first arcuate portion and the second arcuate portion are continuous arcuate surfaces, and the first arcuate portion and the second arcuate portion intersect at one of the apex points of the top portion.

2. The light-emitting device as claimed in claim 1, wherein the light-emitting element emits a light ray, a portion of which is emitted through the central recessed surface and a portion of which is completely reflected by the reflective surface.

3. The light-emitting device as claimed in claim 2, wherein a portion of the light is emitted directly through the convex surface.

4. The light-emitting device as claimed in claim 1, wherein the lens sealing portion further has a concave surface connected between the convex surface at a turning point and the lower surface, and the concave surface is connected to the substrate at a contact point, wherein when viewed along the first axial direction, the concave surface has a third arcuate portion that intersects with the second arcuate portion at a turning point of the turning point, and the third arcuate portion intersects with the substrate at a contact point of the contact point.

5. The light-emitting device as claimed in claim 4, wherein the light-emitting element defines a center point, the central axis passes through the center point, the center point and the vertex define a first line, the first line and the central axis form a first angle, and the first angle is less than or equal to 42.5 degrees.

6. The light-emitting device as claimed in claim 5, wherein the center point and the turning point are defined by a second line, the second line and the central axis form a second angle, and the second angle is greater than 42.5 degrees and less than or equal to 80 degrees.

7. The light-emitting device as claimed in claim 6, wherein when viewed along the first axis, the center point forms a projection point on the third arcuate surface along a second axis, and the second axis is perpendicular to the first axis, wherein the center point and the projection point define a third line, the third line forming a third angle with the central axis, and the third angle being greater than 80 degrees and less than or equal to 90 degrees.

8. The light-emitting device as claimed in claim 4, wherein when viewed along the central axis, the contact portion has a first circular structure and the top portion has a second circular structure, wherein the first circular structure has a first diameter, the second circular structure has a second diameter, and the first diameter is larger than the second diameter.

9. The light-emitting device as claimed in claim 8, wherein the light-emitting element has a width in a second axial direction and the second diameter is greater than the width, wherein the second axial direction is perpendicular to the first axial direction and the ratio of the first diameter to the width is between 12 and 14.

10. The light-emitting device as claimed in claim 9, wherein when viewed along the central axis, the central recessed surface has a third circular structure having a third diameter, and the width is greater than the third diameter.

11. The light-emitting device as claimed in claim 4, wherein the reflective surface intersects the central recessed surface at a central periphery, and when viewed along the first axis, the curvature of the first arcuate surface gradually decreases from one of the peripheral points of the central periphery to the apex.

12. The light-emitting device as claimed in claim 11, wherein when viewed along the first axis, the curvature of the second arcuate surface gradually decreases from the inflection point to the apex.

13. The light-emitting device as claimed in claim 12, wherein when viewed along the first axis, the curvature of the third arcuate surface gradually decreases to 0 from the turning point to the contact point.

14. The light-emitting device as claimed in claim 4, wherein the third arcuate portion has a first arcuate segment and a second arcuate segment, and when viewed along a second axial direction, the light-emitting element overlaps the second arcuate segment but not the first arcuate segment, wherein the second axial direction is perpendicular to the first axial direction.

15. The light-emitting device as claimed in claim 14, wherein a portion of the light is emitted via the second arcuate segment.

16. The light-emitting device as claimed in claim 4, wherein when viewed along the first axial direction, the first arcuate portion is asymmetrical to the second arcuate portion.

17. The light-emitting device as claimed in claim 1, wherein the recess depth is greater than the first height, and the ratio of the second height to the first height is between 7.8 and 10.

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