LIGHT-EMITTING COMPONENT

Abstract

A light-emitting component includes a connection board with a mounting side. The light-emitting component also includes a light source. The light source is fastened and electrically connected to the connection board on the mounting side. The light-emitting component further includes a cover which covers the connection board in places on its mounting side and laterally surrounds the light source. The light-emitting component additionally includes an optical element. The optical element has a central region which is arranged downstream of the light source on the mounting side of the connection board. A provision is made to prevent impingement of light in the central region of the optical element.

Claims

1. A light-emitting component comprising a connection board with a mounting side, a light source which is fastened and electrically connected to the connection board on the mounting side, a cover which covers the connection board in places on its mounting side and laterally surrounds the light source, an optical element having a central region which is arranged downstream of the light source on the mounting side of the connection board, wherein a shape, optical properties and/or a material of the cover are set such that impingement of reflected light in the central region of the optical element is prevented, or wherein the cover comprises a light-reflecting layer on its outer surface, and the light-reflecting layer is arranged to reflect impinging light in a directional manner, so that impingement of reflected light in the central region of the optical element is prevented, or wherein the optical element comprises, in an edge region that laterally surrounds the central region, a light-absorbing layer or a light-reflecting layer on the side of the optical element facing the connection board, wherein the light-absorbing layer or the light-reflecting layer prevent impingement of reflected light in the central region of the optical element.

2. The light-emitting component according to claim 1, wherein the cover is configured to guide light emitted by the light source away from the central region of the optical element.

3. The light-emitting component according to claim 1, wherein the cover comprises a thickness which increases in direction away from the light source.

4. The light-emitting component according to claim 1, wherein the cover projects beyond the light source on the mounting side.

5. The light-emitting component according to claim 1, wherein the light-absorbing layer is configured to absorb at least 90% of impinging visible light.

6. The light-emitting component according to claim 1, wherein the light-absorbing layer is formed of an organic optical rim coating or an inorganic coating.

7. The light-emitting component according to claim 1, wherein the light-reflecting layer is configured to reflect at least 85% of impinging visible light.

8. The light-emitting component according to claim 1, wherein the light-reflecting layer is silver or aluminum coatings and/or dielectric coatings.

9. A light-emitting component comprising a connection board with a mounting side, a light source which is fastened and electrically connected to the connection board on the mounting side, a cover which covers the connection board in places on its mounting side and laterally surrounds the light source, an optical element having a central region which is arranged downstream of the light source on the mounting side of the connection board, wherein the cover is configured to guide light emitted by the light source away from the central region of the optical element to prevent impingement of reflected light, which is reflected at a part of the light-emitting component, in the central region of the optical element, and/or the cover comprises a reflective outer surface on its side facing away from the connection board, wherein the outer surface runs obliquely to a mounting surface on the mounting side of the connection board to prevent impingement of reflected light, which is reflected at a part of the light-emitting component, in the central region of the optical element.

10. The light-emitting component according to claim 9, wherein the cover projects beyond the light source on the mounting side.

11. The light-emitting component according to claim 9, wherein the light source comprises two or more pixelated light-emitting diode chips.

12. A light-emitting component comprising a connection board with a mounting side, a light source which is fastened and electrically connected to the connection board on the mounting side, a cover which covers the connection board in places on its mounting side and laterally surrounds the light source, an optical element having a central region which is arranged downstream of the light source on the mounting side of the connection board, wherein the light-emitting component further comprises an optical body, which guides light emitted by the light source away from the central region of the optical element and which is arranged between the light source and the cover to prevent impingement of reflected light in the central region of the optical element, and/or the light-emitting component further comprises an aperture, covering the light source and the cover, and being arranged between the light source and the optical element, the aperture being configured to prevent impingement of reflected light in the central region of the optical element.

13. The light-emitting component according to claim 12, wherein the optical body is a reflector and wherein the optical body is directly adjacent to the cover on the side of the cover facing the light source.

14. The light-emitting component according to claim 12, wherein the optical body is a reflector and wherein a gap is arranged between the cover and the optical body.

15. The light-emitting component according to claim 12, wherein the optical body is a light guide element.

16. The light-emitting component according to claim 12, wherein the aperture comprises a main body and an opaque layer, wherein the opaque layer covers the main body in a region above the cover and the main body is free of the opaque layer in a region above the light source.

17. The light-emitting component according to claim 12, wherein the light source comprises two or more pixelated light-emitting diode chips.

Description

[0042] The schematic sectional view of FIG. 1 and all of the following sectional views each show a section of the light-emitting component. The right half of the light-emitting component is shown here. The left half of the light-emitting component is designed, for example, axially symmetrical thereto, wherein the axis of symmetry is perpendicular to the connection board 1 and running along the left edge of the figure.

[0043] FIG. 1 shows a schematic sectional view of a light-emitting component described herein according to a first exemplary embodiment. The light-emitting component comprises a connection board 1 with a mounting side 1a. The connection board 1 is, for example, a circuit board. The light-emitting component further comprises a light source 2. Here, the light source 2 comprises multiple light-emitting diode chips 21. The light-emitting diode chips 21 are, for example, each pixelated light-emitting diode chips comprising pixels 22 which are separately controllable.

[0044] The light source is mechanically fastened and electrically connected to the mounting surface 11 on the mounting side 1a of the connection board 1. For example, the light source may be electrically conductively connected to the connection board 1 by contact wires that are not shown.

[0045] The light-emitting component further comprises a cover 3, which covers the connection board 2 at its mounting side 1a in places and laterally surrounds the light source. For example, the cover 3 completely surrounds the light source 2 in lateral directions that run parallel to the main extension plane of the connection board 1. In this case, the cover 3 projects beyond the light source 2 in the vertical direction that runs perpendicular to the main extension plane of the connection board 1. The cover 3 is, for example, formed with a plastic material. In particular, the cover 3 can be designed to be black or colored. For example, the cover 3 covers the contact wires with which the light source is electrically conductively connected to the connection board 1. The cover 3 acts as a mechanical protection for the light source as well as for further components such as the contact wires, for example.

[0046] The light-emitting component further comprises an optical element 4. The optical element 4 comprises a central region 41, which is arranged downstream of the light source 2 on the mounting side 1a of the connection board. Furthermore, the optical element 4 comprises an edge region 42 which completely surrounds the central region 41 in lateral direction. The edge region 42 is arranged above the cover 3, for example.

[0047] Further, the light-emitting component comprises a provision which prevents impingement of reflected light 6 in the central region 41 of the optical element 4.

[0048] In operation, the light source 2 emits light 5. The light 5 partially impinges on another part of the light-emitting component, in the present case for example on the cover 3, and is reflected there. In the present case, the shape of the cover 3 is selected such that the cover 3 is configured to guide light 5 emitted by the light source 2 away from the central region 41 of the optical element or to reflect the emitted light such that it no longer falls within the acceptance angle of the optical system. Thus, a provision is made to prevent impingement of the reflected light 6 in the central region of the optical element 4.

[0049] In the exemplary embodiment of FIG. 1, this is achieved by the cover comprising a thickness D which increases in a direction away from the light source 2. Furthermore, the cover 3 comprises a reflective outer surface 3a on its side facing away from the connection board 1, which reflects impinging light in a directional manner. Due to the increasing thickness, the outer surface 3a runs obliquely to the mounting surface 11 on the mounting surface 1a of the connection board 1. As a result, the reflected light 6 is guided away from the central region 41.

[0050] In the exemplary embodiment of FIG. 2, the cover 3 comprises an ordinary shape. An optical body 7, which guides light 5 emitted from the light source 2 away from the central area 41 of the optical element 4 is arranged between the light source 2 and the cover 3. Thus, a provision is made to prevent impingement of reflected light 6 in the central region of the optical element 4 or to guide the reflected light away from the acceptance angle of the subsequent optical system. For example, the acceptance angle is 45. Thereby, the optical body 7 completely surrounds the light source in lateral directions. In cross-section, the optical body 7 is designed wedge-shaped. It comprises a reflective oblique outer surface 7a facing away from the connection board 1, the oblique outer surface guiding reflected light 6 away from the central area 41.

[0051] Alternatively, the optical body 7 may be a light guide which guides impinging light 5 by reflection past the optical element 4 out of the light-emitting component. In this way, too, it is ensured that no light is reflected into the central region 41 or that no reflected light falls within the acceptance angle of the optical system.

[0052] In connection with the schematic sectional view of FIG. 3, a further exemplary embodiment of a light-emitting component described herein is described. In this exemplary embodiment, in contrast to the exemplary embodiment of FIG. 1, a light-reflecting layer 31 is applied to the cover 3 on its outer surface 3a. The light-reflecting layer 31 is arranged to reflect impinging light 6 in a directional manner, so that in this way, a provision is made to prevent impingement of reflected light 6 in the central region 41 of the optical element 4 or a provision is made that no reflected light falls within the acceptance angle of the subsequent optical system.

[0053] The use of a light-reflecting layer 31 has the advantage that the surface of the cover 3 does not have to be reflective, but the reflectivity can be generated by the reflecting layer 31. The surface of the cover 3 therefore, for example, does not have to be made particularly smooth in order to achieve the desired reflection. A reflection on a rough surface mapped into the far field may be less problematic, because the rough surface makes the reflection appear washed out.

[0054] In connection with FIG. 4, a further exemplary embodiment of a light-emitting component described herein is explained in more detail by means of a schematic sectional view. In contrast to the exemplary embodiment of FIG. 1, the component comprises an aperture 8, which comprises a main body 81 and an opaque layer 82. The aperture 8 is arranged between the light source 2 and the optical element 4 and covers the light source 2 and the cover 3. The opaque layer thereby covers the main body 81 in the region above the cover and the main body 81 is free of the opaque layer in the region above the light source. The cover 3 may, for example, be designed reflective, as described in connection with FIG. 1. Furthermore, it is possible that a reflecting layer 31, as described in connection with FIG. 3, is applied onto the cover. Finally, as cover, a cover of conventional shape as described in connection with FIG. 2 may be used. Light 6 reflected from the cover is absorbed or reflected by the opaque layer 82, so that a provision is made to prevent impingement of reflected light 6 and/or of a portion of the non-reflected light 61 in the central region 41 of the optical element 4.

[0055] In connection with FIG. 5, a further exemplary embodiment of a light-emitting component described herein is explained in more detail by means of a schematic sectional view. In this exemplary embodiment, the optical element 4 comprises, in the edge region 42 which laterally surrounds the central region 41, on the side of the optical element 4 facing the connection board 1, a light-absorbing layer 43 which is arranged to absorb reflected light 6 and/or a portion of the non-reflected light 61. In this way, a provision is made to prevent impingement of reflected light 6 and/or of a portion of the non-reflected light 61 in the central region 41 of the optical element. In the region of the optical element to which the light-absorbing layer 43 is applied, that is, on the underside of the edge region 42 facing the connection board 1, the optical element 4 can in particular run parallel to the mounting surface 11 of the connection board 1.

[0056] In connection with FIG. 6, a further exemplary embodiment of a light-emitting component described herein is explained in more detail by means of a schematic sectional view. In this exemplary embodiment, the optical element 4 comprises, in the edge region 42 on the side of the optical element 4 facing the connection board 1, a light-reflecting layer 44 which is arranged to reflect reflected light 6 and/or a portion of the non-reflected light 61. Thus, a provision is made to prevent impingement of reflected light 6 in the central region of the optical element 4. On the underside of the edge region 42 of the optical element 4 facing the connection board 1, the outer surface of the optical element can run obliquely to the mounting surface 11 of the connection board 1. For example, this outer surface runs parallel to the outer surface 3a of the cover 3 at least in places. In this way, light reflected at the cover 3 can be guided out of the light-emitting component by directional reflection at the reflective layer 44 by means of particularly few reflections.

[0057] In the light-emitting components described herein, it is particularly possible to combine the provisions described herein for preventing impingement of light on the central region 41 of the optical element 4. For example, the use of the aperture 8 as shown in FIG. 4 can be combined with the special shaping of the cover 3 as shown in connection with FIG. 1.

[0058] The invention is not limited to the embodiments by the description based thereon. Rather, the invention comprises any new feature as well as any combination of features, which in particular includes any combination of features in the patent claims, even if this feature or this combination itself is not explicitly stated in the patent claims or embodiments.

LIST OF REFERENCE SIGNS

[0059] 1 connection board [0060] 1a mounting side of the connection board [0061] 11 mounting surface of the connection board [0062] 2 light source [0063] 21 light-emitting diode chip [0064] 22 pixel [0065] 3 cover [0066] 31 light-reflecting layer of the cover [0067] 3a Au [0068] 4 optical element [0069] 41 central region of the optical element [0070] 42 edge region of optical element [0071] 43 light-absorbing layer of the optical element [0072] 44 light-reflecting layer of the optical element [0073] light emitted by the light source [0074] 6 reflected light [0075] 61 non-reflected light [0076] 7 optical body [0077] 7a outer surface of the optical body [0078] 8 aperture [0079] 81 main body [0080] 82 opaque layer of the aperture