Light emitting device
By designing slender light guides and optical coupling elements, the problems of high cost and impure appearance of LED filament lamps were solved, and pure white light output with adjustable color and color temperature was achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SIGNIFY HOLDING BV
- Filing Date
- 2021-07-26
- Publication Date
- 2026-08-04
AI Technical Summary
Existing LED filament lamps are expensive, have an impure appearance, and lack color or color temperature tunability.
A slender light guide is twisted around the central longitudinal axis, combined with light-in and light-out elements, to transmit light using total internal reflection, and achieves efficient light coupling and tuning through specific shapes and features.
It offers a cheaper LED filament lamp that emits pure white light, with adjustable color and color temperature, and an attractive appearance.
Smart Images
Figure CN116157623B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a light-emitting device comprising: at least one LED light source adapted to emit light during operation; an elongated light guide; at least one light-in coupling element configured to couple light from the light source into the elongated light guide; and at least one light-out coupling element configured to couple light from the light source out of the elongated light guide. Background Technology
[0002] Incandescent bulbs are being rapidly replaced by LED-based lighting solutions. However, users appreciate and desire lamps with the appearance of incandescent bulbs. For this purpose, the infrastructure used to produce glass-based incandescent bulbs can be simply utilized, replacing the filament with LEDs that emit white light. One known concept is based on LED filaments placed within such bulbs. These lamps are highly sought after due to their aesthetically pleasing appearance. This type of LED filament lamp is widely available on the market.
[0003] For example, JP 03168673 U1 discloses an incandescent lamp comprising a twisted light guide composed of several posts. The posts of the light guide are twisted to have the shape of a coiled spring. Furthermore, each post of the light guide is rod-shaped with a circular cross-section.
[0004] However, current LED filament lamps are quite expensive, for example, in terms of the cost of the LED filament and / or assembly costs. Moreover, current LED filament lamps have an undesirable, often yellowish or pale yellow appearance, and they do not allow for color or color temperature tunability.
[0005] Therefore, it is still desirable to provide a light-emitting device that allows the production of incandescent lamps, and especially LED filament lamps, that is cheaper to manufacture, that emits light with a purer white appearance, and that allows for tunability of the color or color temperature of the emitted light.
[0006] US 2014 / 340927 discloses a light guide used as a luminaire. The luminaire includes at least one solid-state light source (such as an LED) and a light guide configured to receive light from the solid-state light source. Light from the light source is coupled into the light guide and propagates within the light guide by total internal reflection until the light exits the light guide. The shape of the light guide causes and guides the extraction of light and can also be used to generate a specific pattern of the extracted light. Such shapes include linear wedges and twisted wedges. Optical films can be included on the light input and output surfaces of the light guide. Summary of the Invention
[0007] One object of the present invention is to overcome or mitigate at least some of these problems and to provide a light-emitting device that is cheaper to manufacture, emits light with a purer white appearance, and allows for tunability of the color or color temperature of the emitted light.
[0008] According to a first aspect of the invention, this and other objects are achieved by means of a light-emitting device comprising: at least one LED light source adapted to emit light during operation; and an elongated light guide including a height direction, a width direction, a depth direction, and a central longitudinal axis extending in the height direction, wherein the elongated light guide further comprises
[0009] A first main surface and a second main surface, wherein the second main surface is arranged to extend opposite to the first main surface in the depth direction of the elongated light guide.
[0010] A first surface and a second surface, the second surface being arranged to extend opposite the first surface in the width direction of the elongated light guide, and
[0011] The first end and the second end are arranged to extend opposite the first end in the height direction of the elongated light guide.
[0012] The elongated light guide further includes at least one optical input element and at least one optical output element, the at least one optical input element being configured to couple light from a light source into the elongated light guide, the at least one optical output element being configured to couple light from the light source out of the elongated light guide, wherein the elongated light guide is configured to guide at least a portion of the light source light coupled into the light guide at the optical input element to the optical output element via total internal reflection, wherein the elongated light guide is twisted about the central longitudinal axis of the light guide, and wherein at least one optical output element is elongated.
[0013] Therefore, and especially by providing a light guide having the above-described structure, a light-emitting device with a particularly simple structure and easier assembly is provided. Thus, a light-emitting device that is cheaper to manufacture is provided.
[0014] Furthermore, by providing an elongated light guide that is twisted around the central longitudinal axis of the light guide, and by providing an elongated light coupling element, a light-emitting device is provided that emits light with a purer white appearance, and the light-emitting device allows for tunability of the color or color temperature of the emitted light.
[0015] In one embodiment, the elongated light guide is configured to guide more than 50%, more than 60%, or more than 70% of the light source light coupled into the light guide at the light inlet element to the light outlet element via total internal reflection.
[0016] In one embodiment, the elongated light guide further includes: a third main surface and a fourth main surface, the fourth main surface being arranged to extend opposite to the third main surface, the third main surface and the fourth main surface extending at an angle β relative to the first main surface and the second main surface; a third surface and a fourth secondary surface, the fourth secondary surface being arranged to extend opposite to the third surface, the third surface and the fourth secondary surface extending at an angle β relative to the first surface and the second surface; and a third end and a fourth end, the fourth end being arranged to extend opposite to the third end, the third end and the fourth end extending at an angle β relative to the first end and the second end.
[0017] Therefore, and especially by providing a light guide having the above-described structure, a light-emitting device is provided that has a particularly simple structure and is easier to assemble, while allowing for purer and brighter light output. Thus, a light-emitting device that is cheaper to manufacture and provides brighter white light output is provided.
[0018] In one embodiment, angle β is 90 degrees.
[0019] This choice of angle β provides particularly good functionality and the desired twist shape when twisting a slender light guide around its central longitudinal axis.
[0020] In one embodiment, the elongated light guide is twisted about the central longitudinal axis of the light guide, thereby having a spiral, Archimedean spiral, double spiral, or double Archimedean spiral shape.
[0021] Therefore, a light-emitting device is provided that emits light with a particularly pure white appearance in a regular spiral pattern, and that the light-emitting device allows for tunability of the color or color temperature of the emitted light. Furthermore, a double helix or double Archimedean spiral shape provides a light-emitting device that emits light in a regular double helix pattern, giving a particularly pleasing appearance.
[0022] In one embodiment, at least one optical coupling element is disposed on at least a portion of any one or more of the first, second, third, and fourth subsurfaces, or adjacent to at least a portion of any one or more of the first, second, third, and fourth subsurfaces.
[0023] Thus, a light-emitting device is provided that emits light in a specially regular spiral pattern or in a specially regular double spiral pattern.
[0024] In one embodiment, at least one optical output element includes any one or more of the following features: light scattering feature, light refraction feature, light diffraction feature, and light conversion feature.
[0025] This feature provides exceptionally efficient light coupling with very low loss.
[0026] In one embodiment, at least one optical coupling element is disposed at a first end, at a first surface, or in an elongated light guide.
[0027] This provides a particularly efficient coupling of light into the optical guide with very low loss.
[0028] In one embodiment, at least one optically coupled element comprises an LED filament. In one embodiment, the LED filament extends through a portion or all of the light guide in the height direction H of the light guide.
[0029] Therefore, a light-emitting device with greater versatility in positioning (one or more) optically coupled elements is provided.
[0030] In one embodiment, one or more of the first, second, third, and fourth subsurfaces are adapted to collimate incident light.
[0031] Therefore, a light-emitting device that emits light in a spiral pattern or a double spiral pattern is provided, which is further improved in terms of regularity and attractive appearance.
[0032] In one embodiment, at least one optical coupling device includes anisotropic light distribution characteristics.
[0033] Therefore, a light-emitting device that emits light in a spiral pattern or a double spiral pattern is provided, which is further improved in terms of regularity and attractive appearance.
[0034] In one embodiment, at least one optical coupling element includes multiple surfaces.
[0035] Therefore, a light-emitting device that emits light in a spiral pattern or a double spiral pattern is provided, which is further improved in terms of regularity and attractive appearance.
[0036] In one embodiment, at least one of the first, second, third, and fourth main surfaces includes at least one photoshaping feature.
[0037] Therefore, a light-emitting device that emits light in a spiral pattern or a double spiral pattern is provided, and the light-emitting device is further improved.
[0038] In one embodiment, at least one light source includes any one or more LEDs of warm white light LED, cool white light LED, and (one or more) RGB LED.
[0039] Therefore, a light-emitting device is provided that allows for particularly efficient color or color temperature tunability of the emitted light, wherein the emitted light includes pure white and a pleasant appearance.
[0040] In one embodiment, the average intensity at the subsurface is I1, the average intensity at the main surface is I2, and I1 > 2 * I2. In particular, the average intensity at the subsurface where the optocoupler is arranged is I1.
[0041] Therefore, a light-emitting device that emits light in a spiral pattern or a double spiral pattern is provided, which is further improved in terms of intensity and attractive appearance.
[0042] In one embodiment, at least one of the first main surface and the second main surface, the first surface and the second surface, the first end and the second end, the third main surface and the fourth main surface, the third surface and the fourth secondary surface, and the third end and the fourth end are parallel to each other.
[0043] Therefore, a light-emitting device is provided that emits light with a particularly pure white appearance in a particularly regular spiral pattern, and that the light-emitting device allows for tunability of the color or color temperature of the emitted light in a particularly efficient manner.
[0044] In one embodiment, the LED light source includes a first light source that emits first light source light and a second light source that emits second light source light that is different from the first light source light.
[0045] In one embodiment, the LED light source includes RGB LED, CW and WW LED, or RGBW LED.
[0046] In one embodiment, the light-emitting device further includes a controller for individually controlling the first light source and the second light source to tune the color and / or color temperature.
[0047] Such an embodiment provides a light-emitting device that allows for particularly efficient and well-functioning color or color temperature tunability of the emitted light.
[0048] The light-emitting device may also include a base for connecting the light-emitting device to a lamp base and / or a lamp socket.
[0049] The present invention also relates to luminaires or lamps that include a light-emitting device according to the invention. Such luminaires or lamps may be, for example, light bulbs, incandescent lamps, or filament lamps.
[0050] Note that this invention relates to all possible combinations of the features described in the claims. Attached Figure Description
[0051] This and other aspects of the invention will now be described in more detail with reference to the accompanying drawings, which illustrate one or more embodiments of the invention.
[0052] Figure 1 A perspective view of a luminaire is shown, which includes a first embodiment of a light-emitting device according to the invention.
[0053] Figure 2 It shows Figure 1 A top-view cross-section of the light-emitting device shown.
[0054] Figure 3 It shows Figure 1 A cross-sectional side view of the light-emitting device shown.
[0055] Figure 4 It shows Figure 1 A perspective side view of the light-emitting device shown.
[0056] Figure 5 A perspective view of a light-emitting device according to a second embodiment of the present invention is shown.
[0057] Figure 6 It shows that according to Figure 5 A perspective top view of the light-emitting device.
[0058] Figure 7 A perspective top view of a light-emitting device according to a third embodiment of the present invention is shown.
[0059] Figure 8 A perspective side view of a light-emitting device according to a fourth embodiment of the present invention is shown.
[0060] Figure 9 A perspective top view of a light-emitting device according to a fifth embodiment of the present invention is shown.
[0061] Figure 10 A perspective side view of a light-emitting device according to a sixth embodiment of the present invention is shown.
[0062] As shown in the figures, the dimensions of the layers and regions are exaggerated for illustrative purposes, and therefore the dimensions of the layers and regions are provided to illustrate the general structure of embodiments of the invention. Similar reference numerals always denote similar elements. Detailed Implementation
[0063] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and to fully convey the scope of the invention to those skilled in the art.
[0064] First refer to Figures 1-4 . Figure 1 and Figure 4 A perspective view of a light-emitting device 1 according to a first embodiment of the present invention is shown. Figure 2 The light-emitting device 1 is shown in a cross-sectional top view, and Figure 3 The light-emitting device 1 is shown in a cross-sectional side view.
[0065] Generally, and regardless of the embodiment, the light-emitting device 1 includes: at least one LED light source 6, 61, 62 adapted to emit light during operation; an elongated light guide 2; at least one light-in coupling element 7, 71, 72; and at least one light-out coupling element 81, 82.
[0066] Generally, the elongated optical guide 2 includes a height direction H, a width direction W, a depth direction D, a central longitudinal axis L extending in the height direction H, a transverse axis T extending in the width direction W, and a depth axis X extending in the depth direction D. Generally, the relative dimensions of the elongated optical guide 2 are chosen such that it is larger in the height direction H than in the width direction W and in the depth direction D, and further such that it is larger in the width direction W than in the depth direction D.
[0067] Generally, the elongated optical guide 2 is twisted around its central longitudinal axis L. Thus, the elongated optical guide 2 is configured with a twisted shape, particularly twisted in a spiral-like manner. Figure 1 The light guide 2 shown is shaped into an Archimedean spiral. In principle, the light guide 2 can be twisted, thus having any suitable number of strands, loops, or windings. To obtain a suitable spiral light effect, it is desirable to twist the light guide 2 such that it exhibits at least three strands, loops, or windings.
[0068] Generally, the elongated light guide 2 also includes a first main surface 31 and a second main surface 32. Viewed in the depth direction D of the elongated light guide 2, the second main surface 32 is arranged to extend parallel to and opposite to the first main surface 31. Generally, the elongated light guide 2 also includes a first surface 41 and a second surface 42. Viewed in the width direction W of the elongated light guide 2, the second surface 42 is arranged to extend parallel to and opposite to the first surface 41. Generally, the elongated light guide 2 also includes a first end 51 and a second end 52. The second end 52 is arranged to extend parallel to and opposite to the first end 51 in the height direction H of the elongated light guide 2. Therefore, the elongated light guide 2 is generally plate-shaped. The elongated light guide 2 can be made of polymers such as PMMA, PC, PET, silicone, etc. Generally, the relative dimensions of the elongated light guide 2 are selected such that the areas of the main surfaces 31 and 32 are larger than the areas of the secondary surfaces 41 and 42 and the areas of the ends 51 and 52, respectively, and further, the areas of the secondary surfaces 41 and 42 are larger than the areas of the ends 51 and 52.
[0069] The first main surface 31 has a first main surface area MA1, and the second main surface 32 has a second main surface area MA2. The first surface 41 has a first surface area mA1, and the second surface 42 has a second surface area mA2. The surface areas can satisfy one or more of the following relationships: MA1>5*mA1, MA2>5*mA2, MA1=MA2 and mA1=mA2.
[0070] In other embodiments, not all opposing surface pairs 31, 32; 41, 42; 51, 52 need to be parallel. Instead, in some embodiments, one or more of the first main surface 31 and the second main surface 32, the first surface 41 and the second surface 42, and the first end 51 and the second end 52 may be non-parallel to each other.
[0071] At least one LED light source 6, 61, 62 can be an LED filament 6 (see Figure 2 and Figure 3 ) or one or more LEDs 61, 62 (see Figure 4 At least one LED light source 6, 61, 62 can be or may include any one or more LEDs of warm white LEDs, cool white LEDs, and red, green, and blue (RGB) LEDs. Figure 4 As shown, two LEDs 61 and 62 are arranged at the second end 52 of the light guide 2. Alternatively or additionally, the LEDs can be located at the first end 51 of the light guide 2. Still alternatively or additionally, the LEDs can be located at one of the subsurfaces of the first surface 41 and the second surface 42 of the light guide 2. A combination of LED filaments 6 and LED light sources in the form of one or more LEDs 61 and 62 is also feasible.
[0072] like Figures 1-3As shown, when an LED light source is provided in the form of one or more LED filaments 6, the LED filaments 6 are centrally arranged in the light guide 2. More generally, the LED filaments 6 extend through a portion or all of the light guide 2 in the height direction H. Generally, the LED filaments 6 comprise a plurality of LEDs arranged on an elongated carrier. Typically, the LED filaments comprise more than 10 LEDs, more than 15 LEDs, or more than 20 LEDs. An encapsulation may encapsulate at least a portion of the plurality of LEDs. The encapsulation may include a phosphor and / or a luminescent material. In embodiments where a luminescent material is present in the encapsulation, the LEDs may emit UV and / or blue light. In the absence of a luminescent material in the encapsulation, RGB LEDs may be used. The LED filaments 6 have a width WF, a height HF, and a length LF. In one embodiment, LF > 10 * WF and LF > 10 * HF. The LED filaments 6 may be inserted into a hole in the light guide 2, wherein the hole is located at the central longitudinal axis L of the light guide 2.
[0073] Furthermore, more than one LED light source 6, 61, 62 can be provided. In such embodiments, the LED light source may include a first light source emitting a first light source and a second light source emitting a second light source different from the first light source. Additionally, the light-emitting device 1 may include a controller for individually controlling the first and second light sources to tune color and / or color temperature. Examples of LED light sources for embodiments having more than one light source include RGB LEDs, CW and WW LEDs, and RGBW LEDs.
[0074] One or more optical coupling elements 7, 71, 72 are configured to couple light from the light source into the elongated light guide 2. Generally, one or more optical coupling elements 7, 71, 72 are arranged adjacent to one or more LED light sources 6, 61, 62. Therefore, one or more optical coupling elements 7, 71, 72 can be arranged as follows: at the first end 51, at the second end 52, at the first surface 41, at the second surface 42, or in the elongated light guide 2.
[0075] exist Figures 1-3 In the illustrated embodiment, an optical coupling element 7 is provided. The optical coupling element 7 is centrally arranged in the light guide 2. The optical coupling element 7 extends through a portion or all of the light guide 2 in the height direction H. The optical coupling element 7 forms part of or is configured to form a structure in which the structure is arranged adjacent to the LED light source 6, which is provided in the shape of an LED filament.
[0076] Figure 4 An alternative embodiment of the light-emitting device 100 according to the present invention is shown, which is related to... Figures 1-3The only difference of the light-emitting device 1 is that it provides two LED light sources 61 and 62 and two optical coupling elements 71 and 72. The optical coupling elements 71 and 72 are arranged at the second end 52 of the light guide 2, between the two LED light sources 61 and 62 and the second end 52.
[0077] One or more optical coupling elements 81, 82 are configured to couple light from a light source into an elongated light guide. Furthermore, the one or more optical coupling elements 81, 82 are elongated. In some embodiments, the one or more optical coupling elements 81, 82 may also include additional features, such as, but not limited to, light scattering features, light refraction features, light diffraction features, and light conversion features. The optical coupling elements 81, 82 may be scattering particles (such as BaSO4, TiO2, Al2O3, etc.).
[0078] In the illustrated embodiments (see Figure 2 and Figure 3 The system provides two optical output elements. The two optical output elements 81 and 82 are arranged on or adjacent to at least a portion of both the first surface 41 and the second surface 42. Alternatively, the two optical output elements 81 and 82 may be arranged on or adjacent to all of both the first surface 41 and the second surface 42. Alternatively, one of the optical output elements 81 and 82 may be omitted.
[0079] Now go to Figure 5 and Figure 6 The diagram shows a perspective view and a cross-sectional top view of a light-emitting device 101 according to a second embodiment of the present invention. The light-emitting device 101 differs from the above-described light-emitting device due to the following features. Figures 1-4 The light-emitting devices described.
[0080] The light-emitting device 101 includes an elongated light guide 20, the elongated light guide 20 including and Figures 1-4 The light guide 2 shown has the same general features. Additionally, the elongated light guide 20 includes a third main surface 33 and a fourth main surface 34. The fourth main surface 34 is arranged to extend parallel to and opposite to the third main surface 33. The third main surface 33 and the fourth main surface 34 also extend relative to the first main surface 31 and the second main surface 32 at an angle β. Figure 6 An angle β is shown. The elongated light guide 20 also includes a third surface 43 and a fourth surface 44. The fourth surface 44 is arranged to extend parallel to and opposite to the third surface 43. The third surface 43 and the fourth surface 44 also extend relative to the first surface 41 and the second surface 42 at an angle β. The elongated light guide 20 also includes a third end 53 and a fourth end 54. The fourth end 54 is arranged to extend parallel to and opposite to the third end 53. The third end 53 and the fourth end 54 extend relative to the first end 51 and the second end 52 at an angle β. Figure 5 and Figure 6 In the illustrated embodiment, angle β is approximately 90 degrees. In other embodiments, angle β may be different from 90 degrees, such as being between 45 degrees and 90 degrees, or even less than 45 degrees. Generally, angle β is different from 0 degrees.
[0081] The third principal surface 33 has a third principal surface area MA3, and the fourth principal surface 34 has a fourth principal surface area MA4. The third surface 43 has a third surface area mA3, and the fourth surface 44 has a fourth surface area mA4. The surface areas can satisfy one or more of the following relationships: MA3>5*mA3, MA4>5*mA4, MA3=MA4 and mA3=mA3.
[0082] In other embodiments, not all opposing surface pairs 31, 32; 41, 42; 51, 52; 33, 34; 43, 44; 53, 54 need to be parallel. Instead, one or more of the following may not be parallel to each other: the first main surface 31 and the second main surface 32, the first surface 41 and the second surface 42, the first end 51 and the second end 52, the third main surface 33 and the fourth main surface 34, the third surface 43 and the fourth secondary surface 44, and the third end 53 and the fourth end 54.
[0083] The light-emitting device 101 also includes four optical coupling elements 81, 82, 83, and 84. In the illustrated embodiment (see...), Figure 6 Four optical output elements 81, 82, 83, and 84 are arranged on or adjacent to at least a portion of each of the first surface 41, the second surface 42, the third surface 43, and the fourth surface 44. In other embodiments, one, two, or three of the optical output elements may be omitted.
[0084] Generally, the elongated light guide 20 is also twisted around its central longitudinal axis L. Thus, the elongated light guide 20 is configured with a double-twisted shape, particularly twisted in a manner similar to a double helix. Figure 5 The light guide 20 shown is shaped into a double Archimedean spiral.
[0085] exist Figure 5 and Figure 6 In the embodiment shown, the LED light source is an LED filament 6. Alternatively or additionally, the LED may be located at one or more of the first end 51, the second end 52, the third end 53, and the fourth end 54.
[0086] Figure 7A cross-sectional top view of a light-emitting device 102 according to a third embodiment of the present invention is shown. Since the first surface 41 and the second surface 42 respectively include collimators 91 and 92, the light-emitting device 102 is related to the above-mentioned... Figures 1-6 The light-emitting devices described are different. Therefore, in more general terms, one or more of the subsurfaces of the first surface 41, the second surface 42, the third surface 43, and the fourth surface 44 can be adapted to collimate incident light, such that the light-emitting device 102 emits collimated light.
[0087] Figure 8 A cross-sectional side view of a light-emitting device 103 according to a fourth embodiment of the present invention is shown. Since at least one optical coupling device 7 is arranged at the first end 51 of the light guide 2, the light-emitting device 103 is related to the above-mentioned... Figures 1-7 The light-emitting devices described are different. Furthermore, the light-coupled device 7 includes anisotropic light distribution characteristics 73.
[0088] Figure 9 A cross-sectional top view of a light-emitting device 104 according to a fifth embodiment of the present invention is shown. Since the two light-exiting elements 81 and 82 each include multiple surfaces, the light-emitting device 104 is related to the above-mentioned... Figures 1-8 The light-emitting devices described are different. In the illustrated embodiment, each of the two light-emitting elements 81 and 82 includes three surfaces 811, 812, 813; 821, 822, 823. Therefore, in this embodiment, light-emitting element 81 is arranged such that the first surface 811 is adjacent to the first main surface 41, the second surface 812 is adjacent to the first main surface 31, and the third surface 813 is adjacent to the second main surface 32. Similarly, light-emitting element 82 is arranged such that the first surface 821 is adjacent to the second surface 42, the second surface 822 is adjacent to the first main surface 31, and the third surface 823 is adjacent to the second main surface 32. Alternatively, light-emitting elements 81 and 82 may also include two, four, or five surfaces. In another alternative, light-emitting elements 81 and 82 may also include different numbers of surfaces.
[0089] Figure 10 A cross-sectional side view of a light-emitting device 105 according to a sixth embodiment of the present invention is shown. Since the first main surface 31 includes at least one (and two in the illustrated embodiment) light-shaping features 311 and 312, the light-emitting device 105 is related to the above-mentioned... Figures 1-9 The light-emitting devices described are different. Other numbers of light-shaping features may also be feasible. In more general terms, at least one of the first main surface 31, the second main surface 32, the third main surface 33, and the fourth main surface 34 may therefore include at least one light-shaping feature 311, 312.
[0090] Now refer to it again Figure 1 The light-emitting device (or in fact a combination of such embodiments) according to any of the embodiments described herein can be used in a luminaire 10 such as a light bulb. By way of non-limiting example, Figure 1 The luminaire 10 shown includes a light-emitting device 1 according to the invention. In principle, the luminaire may also include more than one (such as two, three, or more) light-emitting devices according to the invention. Therefore, in this respect, the light-emitting devices according to the invention can be arranged in the luminaire 10 such that the central longitudinal axis L of the elongated light guide 2 extends parallel to the longitudinal axis M of the luminaire 10, as... Figure 1 As shown. Alternatively, the light-emitting device according to the invention can be arranged in the lamp 10 such that the central longitudinal axis L of the elongated light guide 2 extends perpendicular to the longitudinal axis M of the light-emitting device 1.
[0091] The luminaire 10 includes a luminaire socket 12 and a luminaire base 13, the luminaire base 13 being used to mechanically and / or electrically connect the light-emitting device 1 to the luminaire socket 12. Furthermore, the luminaire socket 12 may include terminals 14 for electrical connection to an external power source.
[0092] Therefore, the light-emitting device may also include a base 15 for connecting the light-emitting device to the lamp base 13 and thereby to the lamp socket 12. The lamp socket 12 supplies power to the light sources 6, 61, and 62 of the light-emitting device 1 through the lamp base 13.
[0093] like Figure 1 As shown, the lamp base 13 can also be used as a holder or support for supporting the light-emitting device 1.
[0094] In another embodiment, it is also feasible to omit the lamp base 13, in which case the base 15 of the light-emitting device 1 is adapted to be directly connected to the lamp socket 12. In yet another embodiment, it is also feasible to omit the base 15 of the light-emitting device 1, in which case the lamp base 13 is adapted to be directly connected to the light-emitting device 1.
[0095] The luminaire 10 may also include an envelope structure or bulb 11 that partially or completely encloses the light-emitting device 1. In the illustrated embodiment, the envelope or bulb 11 is arranged at a certain distance from the light-emitting device 1.
[0096] Those skilled in the art will recognize that the present invention is by no means limited to the preferred embodiments described above. Rather, many modifications and variations are possible within the scope of the appended claims.
[0097] Additionally, from a study of the drawings, disclosure, and appended claims, those skilled in the art can understand and implement variations of the disclosed embodiments in practicing the claimed invention. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not imply that combinations of these measures cannot be advantageously used.
Claims
1. A light-emitting device (1), comprising: At least one LED light source (6, 61, 62) is adapted to emit light during operation, and An elongated light guide (2) includes a height direction (H), a width direction (W), a depth direction (D), and a central longitudinal axis (L) extending in the height direction, wherein the elongated light guide further includes: A first main surface (31) and a second main surface (32), the second main surface being arranged to extend opposite to the first main surface in the depth direction of the elongated light guide. A first surface (41) and a second surface (42), the second surface being arranged to extend opposite the first surface in the width direction of the elongated light guide, and A first end (51) and a second end (52), the second end being arranged to extend opposite the first end in the height direction of the elongated light guide. The elongated light guide (2) further includes at least one optical input element (7, 71, 72) and at least one optical output element (81, 82). The at least one optical input element is configured to couple the light source light into the elongated light guide, and the at least one optical output element is configured to couple the light source light out of the elongated light guide. The elongated light guide is configured to guide at least a portion of the light source light coupled into the light guide at the optical input element to the optical output element via total internal reflection. The elongated light guide (2) is twisted around the central longitudinal axis of the light guide. The at least one optically coupled element (81, 82) is elongated, and The at least one optically coupled element (7) therein comprises an LED filament that extends through a portion or all of the light guide in the height direction (H) of the light guide.
2. The light-emitting device according to claim 1, wherein the elongated light guide further comprises: A third main surface (33) and a fourth main surface (34), the fourth main surface being arranged to extend opposite to the third main surface, the third main surface and the fourth main surface extending relative to the first main surface and the second main surface at an angle β. A third surface (43) and a fourth surface (44), the fourth surface being arranged to extend relative to the third surface, the third surface and the fourth surface extending relative to the first surface and the second surface at an angle β, and The third end (53) and the fourth end (54) are arranged to extend opposite the third end, and the third end and the fourth end extend at an angle β relative to the first end and the second end.
3. The light-emitting device according to claim 2, wherein the angle β is 90 degrees.
4. The light-emitting device according to any one of the preceding claims, wherein the elongated light guide (2) is twisted about the central longitudinal axis (L) of the light guide to have a spiral, Archimedean spiral, double spiral or double Archimedean spiral shape.
5. The light-emitting device according to any one of claims 2-3, wherein the at least one light-coupled element (81, 82) is disposed on at least a portion of any one or more of the first surface, the second surface, the third surface and the fourth surface, or adjacent to at least a portion of any one or more of the first surface, the second surface, the third surface and the fourth surface.
6. The light-emitting device according to any one of claims 1-3, wherein the at least one light-coupled element (81, 82) comprises any one or more features of light scattering, light refraction, light diffraction and light conversion.
7. The light-emitting device according to any one of claims 2-3, wherein the at least one light-coupled element (7, 71, 72) is arranged in any one or more of the following ways: at the first end, at the second end, at the third end, at the fourth end, at the first surface, at the second surface, at the third surface, at the fourth surface, or in the elongated light guide.
8. The light-emitting device according to any one of claims 2-3, wherein one or more of the first surface (41), the second surface (42), the third surface (43) and the fourth surface (44) are adapted to collimate incident light.
9. The light-emitting device according to any one of claims 1-3, wherein the at least one light-coupled device comprises anisotropic light distribution characteristics (73).
10. The light-emitting device according to any one of claims 1-3, wherein the at least one light-coupled element comprises a plurality of surfaces (811, 812, 813; 821, 822, 823).
11. The light-emitting device according to any one of claims 2-3, wherein at least one of the first main surface, the second main surface, the third main surface and the fourth main surface includes at least one light-shaping feature (311, 312).
12. The light-emitting device according to any one of claims 1-3, wherein the average intensity at the secondary surface is I1, the average intensity at the primary surface is I2, and wherein I1 > 2. I2.
13. The light-emitting device according to any one of claims 2-3, wherein at least one of the following: The first main surface (31) and the second main surface (32) are parallel to each other. The first surface (41) and the second surface (42) are parallel to each other. The first end (51) and the second end (52) are parallel to each other. The third main surface (33) and the fourth main surface (34) are parallel to each other. The third surface (43) and the fourth surface (44) are parallel to each other, and The third end (53) and the fourth end (54) are parallel to each other.
14. A lamp comprising a light-emitting device (1) according to any one of the preceding claims.
15. A lamp comprising a light-emitting device (1) according to any one of claims 1-13.