Lighting device and motor vehicle

Abstract

To provide a lighting device that can improve the heat dissipation performance of a light source and the blocking precision, reduce the weight of a heat sink, and lower the production cost.SOLUTION: The present invention provides a lighting device that comprises a light source, a printed circuit board, an optical face, and a lens, in which the light source is mounted on the printed circuit board, and at least a portion of light rays emitted by the light source towards the optical face is guided by the optical face and then emerges through the lens; at least one light shielding electronic element is also mounted on the printed circuit board, for blocking at least a portion of light rays emitted by the light source towards the lens, to prevent this portion of light rays from emerging through the lens directly.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of vehicle lamps, in particular lighting devices and motor vehicles. [Background technology]

[0002] Lighting devices can provide light for illumination and / or signaling and are widely used in various fields; for example, vehicle lamps are used in motor vehicles to ensure safe driving. Types of vehicle lamps include motor vehicle headlamps (including low beam lamps and high beam lamps), fog lamps, tail lamps, daytime running lamps, turn signal lamps, brake lamps, and side marker lamps, and in the field of vehicle lamp lighting, various countries have strict legal requirements regarding light distribution.

[0003] In some vehicle lamp modules, a reflector, a light source, and a lens work together to achieve the required light distribution. However, due to the lack of control over the light rays emitted from the light source, some stray light rays may not be reflected by the reflector and may directly pass through the lens; this results in a light distribution that does not meet legal requirements and also causes glare.

[0004] To solve this problem, a light shielding part is generally formed integrally with the heat sink to block stray light rays from the light source. In this case, the light source is quite far from the light shielding part, so the light shielding effect is not ideal; furthermore, in order to get close to the light shielding part, the light source needs to be placed as close as possible to the edge of the printed circuit board, which results in a very poor heat dissipation performance. Summary of the Invention

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to propose a lighting device and a motor vehicle which are able to at least partially solve the above-mentioned problems.

[0006] According to one aspect of the present invention, there is provided an illumination device comprising a light source, a printed circuit board, an optical surface and a lens; a light source mounted on the printed circuit board, at least a portion of the light beam emitted by the light source towards the optical surface being guided by the optical surface and then emerging through the lens; At least one light-blocking electronic element is also mounted on the printed circuit board to block at least a portion of the light beam emitted by the light source towards the lens, preventing this portion of the light beam from emerging directly through the lens.

[0007] Compared with prior art solutions in which the light shielding part is integrated into the heat sink, the use of electronic elements on the printed circuit board as the light shielding part in embodiments of the present invention can improve the heat dissipation performance and blocking accuracy of the light source, reduce the weight of the heat sink, and reduce manufacturing costs.

[0008] In some embodiments, a single light-shielding electronic element is mounted on the printed circuit board, the light-shielding electronic element having a size larger than the light source.

[0009] According to an embodiment of the present invention, when a single light-shielding electronic element is used, configuring the light-shielding electronic element to have a size larger than the light source allows it to effectively block light rays emitted by the light source towards the lens.

[0010] In some embodiments, a plurality of light-blocking electronic elements are mounted on the printed circuit board, the plurality of light-blocking electronic elements being arranged together to block at least a portion of the light beam emitted by the light source towards the lens.

[0011] According to an embodiment of the present invention, when multiple light-shielding electronic elements are used, the light-shielding electronic elements are appropriately arranged to enable effective blocking of light rays emitted by the light source towards the lens.

[0012] In some embodiments, the minimum distance between the light source and the edge of the printed circuit board is greater than 4 mm.

[0013] According to an embodiment of the present invention, using light-shielding electronic elements on a printed circuit board as a light shield allows the light source to be positioned away from the edge, thereby improving the heat dissipation performance of the light source.

[0014] In some embodiments, the light-blocking electronic elements are not included in the electronic circuitry.

[0015] According to embodiments of the present invention, appropriate electronic elements can be flexibly selected depending on the requirements for blocking the light beams emitted by the light source towards the lens; it is not necessary to be limited to the electronic elements included in the electronic circuit.

[0016] In some embodiments, the light-blocking electronic elements are positioned so as not to block light rays from the optical surface.

[0017] According to an embodiment of the present invention, this can prevent the shading electronic elements from adversely affecting normal light distribution.

[0018] In some embodiments, the light source comprises a light emitting diode.

[0019] In some embodiments, the optical surface comprises a reflective surface of a reflector.

[0020] According to another aspect of the present invention, there is further provided a motor vehicle comprising any one of the lighting devices described above. [Brief explanation of the drawings]

[0021] To facilitate understanding of the present invention, the present invention will be described in more detail below based on exemplary embodiments with reference to the drawings. In the drawings, the same or similar reference labels are used to indicate the same or similar elements. It should be understood that the drawings are merely schematic views, and the dimensions and proportions of the elements in the drawings are not necessarily accurate. [Figure 1] FIG. 1 shows a perspective view of a lighting device 10 according to an embodiment of the present invention. [Figure 2] FIG. 2 shows a schematic optical path diagram of the lighting device 10 according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] Detailed Description of the Embodiments Hereinafter, embodiments of the present invention will be described illustratively. Those skilled in the art will recognize that the described embodiments can be modified in various ways without departing from the concept of the present invention. Therefore, the drawings and descriptions are illustrative in nature and not restrictive. In the following text, the same reference numerals generally indicate elements having the same or similar functions.

[0023] The invention will be explained in detail below with reference to the drawings.

[0024] Fig. 1 shows a perspective view of a lighting device 10 according to an embodiment of the present invention; Fig. 2 shows a schematic optical path diagram of the lighting device 10 according to an embodiment of the present invention. As shown in Figs. 1 and 2, the lighting device 10 includes a heat sink 100, a printed circuit board 200, a reflector 300, and a lens 400. The heat sink 100 includes a substantially planar mounting surface 110 for supporting the printed circuit board 200; the printed circuit board 200 may be fixed to the mounting surface 110 by means of locating pins, locating holes, screw connections, etc.

[0025] The printed circuit board 200 comprises a light source 210 and a light-shielding electronic element 220 disposed near the light source 210. As shown in Fig. 2, at least a portion of a light ray L1 emitted by the light source 210 toward the reflector 300 is reflected by an optical surface (i.e., the reflective surface 310) of the reflector 300 and then emerges through the lens 400; at least a portion of a light ray L2 emitted by the light source 210 toward the lens 400 is blocked by the light-shielding electronic element 220 and therefore cannot emerge through the lens 400, thus avoiding undesirable light distribution. Furthermore, as shown in Fig. 2, multiple light sources may be mounted on the printed circuit board 200, each having a corresponding light-shielding electronic element.

[0026] In one example, the light blocking electronic elements 220 have a size larger than the light source 210 in order to effectively block the light rays emitted by the light source 210 towards the lens 400. For example, the light blocking electronic elements 220 have a height larger than the light source 210, or the light blocking electronic elements 220 have a width larger than the light source 210 (in FIG. 1 , this is the dimension in a direction substantially parallel to the edge 230 of the printed circuit board 200), or both the height and width of the light blocking electronic elements 220 are larger than the height and width of the light source 210.

[0027] In one example, the light-shielding electronic element 220 is located between the light source 210 and the edge 230 of the printed circuit board 200, and the distance between the light source 210 and the edge 230 may be greater than 4 mm. Prior art solutions in which a light-shielding portion is integrated into a heat sink require the light source to be located as close as possible to the edge of the printed circuit board, which reduces the heat dissipation performance of the light source. However, in embodiments of the present invention, using the light-shielding electronic element on the printed circuit board 200 as a light-shielding portion allows the light source 210 to be located away from the edge 230, thereby improving the heat dissipation performance of the light source 210.

[0028] In one example, the light blocking electronic elements 220 are not energized to perform the circuit function, i.e., are not included in the electronic circuit. In this way, there is flexibility in selecting appropriate electronic elements depending on the requirements for blocking light rays emitted by the light source toward the lens; there is no need to be limited to electronic elements included in the electronic circuit.

[0029] In one example, the dimensions of the shading electronic element 220 and its distance from the light source 210 are such that it does not block light rays from the optical surface, which can prevent the shading electronic element 220 from adversely affecting normal light distribution.

[0030] In one example, light source 210 comprises a light emitting diode, but may comprise any other suitable type of light source.

[0031] It should be mentioned that in the embodiment of the present invention, there is no limitation on the type of the light-shielding electronic element 220; it may be a capacitor, a resistor, an inductor, a diode, a transistor or an IC, etc., as long as its dimensions meet the light-shielding requirements.

[0032] Both the light source 210 and the light-shielding electronic element 220 can be mounted on a printed circuit board by processes such as through-hole mounting (DIP) or surface mounting (SMT), so the light-shielding electronic element 220 can be mounted in close proximity to the light source 210 with a high degree of accuracy, thereby improving blocking accuracy.

[0033] In the example shown in FIG. 2, a single shading electronic element 220 is shown blocking light rays emitted by the light source 210 toward the lens 400, but it will be understood that multiple shading electronic elements 220 may also be suitably arranged to block light rays emitted by the light source 210 toward the lens 400, for example if the light source 210 has a larger size than the single shading electronic element 220.

[0034] In the example shown in FIG. 2, the optical surface for guiding the light rays emitted by the light source 210 is shown to be the reflective surface 310 of the reflector 300, but embodiments of the present invention are not limited to this; the lighting device 10 may include other types of optical surfaces for guiding the light rays emitted by the light source 210, including, but not limited to, optical reflection, refraction, scattering, and transmission.

[0035] Compared with prior art solutions in which the light shielding part is integrated into the heat sink, the use of electronic elements on a printed circuit board as the light shielding part in embodiments of the present invention can improve the heat dissipation performance and blocking accuracy of the light source, reduce the weight of the heat sink, and reduce manufacturing costs.

[0036] Embodiments of the present invention further relate to a motor vehicle comprising any one of the lighting devices described above.

[0037] Although the technical objectives, technical solutions and technical effects of the present invention have been described in detail above with reference to specific embodiments, it should be understood that the above embodiments are merely illustrative and not limiting. Any modifications, equivalent replacements or improvements made by those skilled in the art within the essential spirit and principles of the present invention shall fall within its protection scope.

Claims

1. An illumination device (10) comprising a light source (210), a printed circuit board (200), an optical surface and a lens (400); the light source (210) is mounted on the printed circuit board (200), and at least a portion of the light emitted by the light source (210) towards the optical surface is guided by the optical surface and then emerges through the lens (400); At least one light-blocking electronic element (220) is also mounted on the printed circuit board (200) to block at least a portion of the light beam emitted by the light source (210) towards the lens (400) so as to prevent said portion of the light beam from emerging directly through the lens (400). A lighting device (10) characterized in that:

2. 2. The lighting device (10) of claim 1, wherein a single light-shielding electronic element (220) is attached to the printed circuit board (200), the light-shielding electronic element (220) having a size larger than the light source (210).

3. 2. The lighting device (10) of claim 1, wherein a plurality of shading electronic elements (220) are attached to the printed circuit board (200), the plurality of shading electronic elements (220) being arranged together to block at least a portion of the light rays emitted by the light source (210) toward the lens (400).

4. 2. The lighting device (10) of claim 1, wherein the minimum distance between the light source (210) and the edge of the printed circuit board (200) is greater than 4 mm.

5. 2. The lighting device (10) of claim 1, wherein the light-blocking electronic element (220) is not included in an electronic circuit.

6. 2. The lighting device (10) of claim 1, wherein the light-blocking electronic element (220) is positioned so as not to block light rays from the optical surface.

7. The lighting device (10) according to any one of the preceding claims, characterized in that the light source (210) comprises a light emitting diode.

8. The illumination device (10) according to any one of the preceding claims, characterized in that the optical surface comprises a reflective surface (310) of a reflector (300).

9. A motor vehicle comprising a lighting device (10) according to any one of claims 1 to 8.

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