An adjustable lighting fixture

Abstract

The present invention discloses an adjustable lighting fixture, which includes a first light source group, a high-low beam switching mechanism and a lens arranged in sequence along the optical path. The upper half of the lens corresponding to the first light source group is missing. The light emitted by the first light source group is projected onto the lens and covers the upper and lower sides of the optical axis of the lens. It further includes a second light source group arranged in front of the first light source group and corresponding to the missing part of the lens. The second light source group includes a second LED light source, a laser light source, a second reflector cup corresponding to the second LED light source, and a control switch connected to the second LED light source and the laser light source. By setting the second light source group as an auxiliary module for the high beam mode and arranging the second LED light source and the laser light source in the auxiliary module, the auxiliary high beam range output by the second LED light source is wider, and the central light intensity of the auxiliary high beam output by the laser light source is brighter. Through the control of the switch, it is possible to switch between two different auxiliary high beams to meet the requirements of different environments.

Description

Technical Field

[0001] The present invention relates to the technical field of semiconductor lighting, and particularly relates to an adjustable lighting fixture. Background Art

[0002] With the development of semiconductor technology, LED (Light Emitting Diode) light sources are gradually replacing traditional incandescent lamps and energy-saving lamps due to their advantages of high efficiency, energy conservation, environmental protection, low cost, and long lifespan, and have become a general lighting source, especially widely used in automotive headlights with integrated high and low beams.

[0003] The structure of existing LED automotive headlights with integrated high and low beams is as Figure 1 shown, including a low-beam LED light source module 1, a high-beam LED light source module 2, a light-shielding plate, and a lens 4. The low-beam LED light source module 1 and the high-beam LED light source module 2 are arranged on the upper and lower sides of a bracket. The light emitted by the low-beam LED light source module 1 is projected onto the lower part of the lens 4 for emission, and the light emitted by the high-beam LED light source module 2 is projected onto the upper part of the lens 4 for emission. However, affected by the brightness of the LED light source, there are often problems that the high-beam lighting cannot meet the actual needs, especially in environments with bad weather or darkness. Summary of the Invention

[0004] The present invention aims at the technical problems existing in the prior art, and provides an adjustable lighting fixture that can improve the central light intensity of the lighting spot and can meet different usage environments.

[0005] To solve the above technical problems, the technical solution of the present invention is: an adjustable lighting fixture, including a first light source group, a high-low beam switching mechanism, and a lens arranged in sequence along the optical path. The upper half of the lens corresponding to the first light source group is missing. The light emitted by the first light source group is projected onto the lens and covers the upper and lower sides of the optical axis of the lens. It further includes a second light source group arranged in front of the first light source group and corresponding to the missing part of the lens. The second light source group includes a second LED light source, a laser light source, a second reflector cup corresponding to the second LED light source, and a control switch connected to the second LED light source and the laser light source.

[0006] Further, the first light source group includes a first reflector cup and an LED light source corresponding to the focus of the first reflector cup. One end of the first reflector cup far from the lens is inclined downward relative to the optical axis of the lens.

[0007] Further, a light-passing hole is provided on the second reflector cup, and the light emitted by the laser light source passes through the light-passing hole and then is incident on the second LED light source.

[0008] Further, the second LED light source includes a plurality of LED chips and phosphor sheets corresponding to each of the LED chips, and the light emitted by the laser light source is projected onto the central position of the second LED light source.

[0009] Further, the second light source group further includes a heat dissipation base plate, and the second LED light source and the second reflecting cup are disposed on the heat dissipation base plate.

[0010] Further, the bottom of the second reflecting cup is fixed to the heat dissipation base plate by screws and the relative position is adjustable.

[0011] Further, it further includes a third light source group located below the first light source group, and the third light source group includes a third LED light source and an optical path turning member corresponding to the third LED light source.

[0012] Further, the optical path turning member at least includes an incident surface, a first reflection surface, a second reflection surface and an exit surface, and the incident surface corresponds to the light emitting surface of the second LED light source.

[0013] Further, the optical path turning member is a transparent polyhedron, the incident surface is in a groove shape, and the light emitted by the second LED light source is projected onto the incident surface.

[0014] Further, the incident surface is a rotating curved surface formed by rotating a plurality of line segments, the plurality of line segments include a curve in the middle and straight lines on both sides, and the first reflection surface and the second reflection surface are total internal reflection surfaces.

[0015] The present invention provides an adjustable lighting fixture, which includes a first light source group, a high-low beam switching mechanism and a lens arranged in sequence along the optical path. The upper half of the lens corresponding to the first light source group is missing. The light emitted by the first light source group is projected onto the lens and covers the upper and lower sides of the optical axis of the lens. It further includes a second light source group arranged in front of the first light source group and corresponding to the missing part of the lens. The second light source group includes a second LED light source, a laser light source, a second reflecting cup corresponding to the second LED light source, and a control switch connected to the second LED light source and the laser light source. By setting an auxiliary module for the high beam mode in the second light source group, and arranging a second LED light source and a laser light source in the auxiliary module, and controlling the two to be alternately lit by the control switch, two modes of auxiliary light spots are provided. Since the sizes of the light emitting surfaces of the light source surfaces in the two modes are different, the auxiliary high beam range output by the second LED light source is wider, while the central light intensity of the auxiliary high beam output by the laser light source is brighter. By controlling the switch, it is possible to switch between two different auxiliary high beams to meet the requirements of different environments. In addition, by setting the light emitted by the first light source group to be projected onto the lens and covering the upper and lower sides of the optical axis of the lens, the central light intensity of the light output by the lens is higher. Brief Description of the Drawings

[0016] Figure 1 is a schematic structural view of an integrated LED high and low beam automotive headlamp in the prior art;

[0017] Figure 2 is a schematic structural view of an adjustable lighting fixture in Embodiment 1 of the present invention;

[0018] Figure 3 is a schematic view of the position of a lens and a second reflecting cup in Embodiment 1 of the present invention;

[0019] Figure 4 is a schematic view of a lens and a second LED light source in Embodiment 1 of the present invention;

[0020] Figure 5 is a schematic view of the installation of a lens, a second reflecting cup and a heat dissipation bottom plate in Embodiment 1 of the present invention;

[0021] Figure 6 is a schematic structural view of an adjustable lighting fixture in Embodiment 2 of the present invention;

[0022] Figure 7 is a cross-sectional view of a lens in Embodiment 2 of the present invention;

[0023] Figure 8 is a schematic structural view when there are two optical path turning members in Embodiment 2 of the present invention.

[0024] Figure 1 As shown in : 1, low beam LED light source module; 2, high beam LED light source module; 4, lens;

[0025] Figures 2 - 8 As shown in : 10, first light source group; 110, first LED light source; 120, first reflecting cup; 20, high and low beam switching mechanism; 30, lens; 310, optical axis; 410, second LED light source; 411, LED chip; 412, phosphor sheet; 420, laser light source; 430, second reflecting cup; 440, heat dissipation bottom plate; 450, screw; 50, third light source group; 510, third LED light source; 520, optical path turning member; 521, incident surface; 522, first reflecting surface; 523, second reflecting surface; 524, exit surface. Detailed Embodiments

[0026] The present invention will be described in detail below with reference to the accompanying drawings.

[0027] Embodiment 1

[0028] As Figures 2 - 3As shown in the figure, the present invention provides an adjustable lighting fixture, which includes a first light source group 10, a high-low beam switching mechanism 20, and a lens 30 arranged in sequence along the optical path. The upper half of the lens 30 corresponding to the first light source group 10 is missing, that is, the size of the lens 30 is between a semi-circular lens and a circular lens, and it can also be regarded as cutting off a part of the circular lens, and the cut-off part is less than half of the lens. The light emitted by the first light source group 10 is projected onto the lens 30 and covers both the upper and lower sides of the optical axis 310 of the lens 30. Here, the optical axis 310 of the lens 30 refers to the central axis of the circular lens before cutting, that is Figure 2 the light emitted from the first light source group 10 reaches the front surface of the lens 30 as shown in the figure, and the light field distribution on the front surface of the lens 30 covers at least the area above the optical axis 310, so that the central light intensity of the light spot output by the lens 30 is higher. The lighting fixture further includes a second light source group arranged in front of the first light source group 10 and corresponding to the missing part of the lens 30. The second light source group includes a second LED light source 410, a laser light source 420, a second reflector 430 corresponding to the second LED light source 410, and a control switch connected to the second LED light source 410 and the laser light source 420. The on / off of the second LED light source 410 and the laser light source 420 is controlled by the control switch, and LED lighting or laser lighting can be performed according to needs. Specifically, the high-low beam switching mechanism 20 is a light-changing motor. The light output by the first light source group 10 can be switched between high beam and low beam under the action of the high-low beam switching mechanism 20, and the second light source group is used to assist and supplement the high beam lighting to improve the illumination distance and brightness. The following auxiliary methods can be adopted: in the low beam mode, the first light source group 10 is lit, the light-changing motor does not work, and the lens 30 outputs low beam light; in the high beam mode, the first light source group 10 is lit, the light-changing motor is turned on, and at the same time the second LED light source 410 or the laser light source 420 is lit to output auxiliary high beam light; only one of the second LED light source and the laser light source 420 will be lit, and the other will not be lit. According to the number of times the high beam switch is turned on, the two will be lit alternately, as follows: when the high beam is turned on for the first time, the second LED light source 410 is lit and the laser light source 420 is not lit; when the high beam is turned on for the second time, the second LED light source 410 is not lit and the laser light source 420 is lit; when the high beam is turned on for the third time, the second LED light source 410 is lit and the laser light source 420 is not lit... and so on in a cycle. The present invention provides an auxiliary module for the high beam mode by setting the second light source group, and sets the second LED light source 410 and the laser light source 420 in the auxiliary module, and controls the two to be lit alternately through the control switch, so as to provide two modes of auxiliary light spots. Since the luminous surface sizes of the light source surfaces in the two modes are different, the auxiliary high beam range output by the second LED light source 410 is wider, and the central light intensity of the auxiliary high beam output by the laser light source 420 is brighter. The control of the switch can switch between two different auxiliary high beams to meet the needs of different environments.

[0029] Preferably, the first light source group 10 includes a first reflector cup 120 and a first LED light source 110 corresponding to the focus of the first reflector cup 120. The light emitted by the first LED light source 110 is projected onto the first reflector cup 120 and then exits in a specified direction after reflection. In existing lamps, the bottom of the first reflector cup 120 is usually parallel to the optical axis of the lens 30. In this embodiment, the end of the first reflector cup 120 away from the lens 30 is inclined downward relative to the optical axis 310 of the lens 30, that is, the end of the first reflector cup 120 away from the lens 30 rotates downward by a certain angle relative to the optical axis 310 of the lens 30. Thus, the first reflector cup 120 can collect light at a larger angle emitted by the first LED light source 110 and exit it, further improving the illumination brightness and the light source utilization rate. In addition, rotating the end of the first reflector cup 120 away from the lens 30 downward by a certain angle relative to the optical axis of the lens 30 can also better make the light exiting it reach the area above the optical axis 310 of the lens 30, improving the central light intensity of the illumination spot.

[0030] Preferably, a light passing hole is provided on the second reflector cup 430, and the light emitted by the laser light source 420 passes through the light passing hole and then is incident on the second LED light source 410. Preferably, as Figure 4 shown, the second LED light source 410 includes a plurality of LED chips 411, and a phosphor sheet 412 is provided above each LED chip 411. The light emitted by each LED chip 411 is projected onto the corresponding phosphor sheet 412 and then exits white light after excitation. The light emitted by the laser light source 420 is projected onto the central position of the second LED light source 410. The plurality of LED chips can be arranged in a close arrangement or with a certain gap between them. Of course, in order to ensure the positional relationship between the plurality of LED chips and facilitate installation, the plurality of LED chips are encapsulated into one body and fixed on the heat dissipation bottom plate 440. The light emitted by the laser light source 420 passes through the light passing hole and then is projected onto the phosphor sheet corresponding to the LED chip in the middle for excitation.

[0031] Preferably, the second light source group further includes a heat dissipation bottom plate 440. The LED light source and the second reflector cup 430 are provided on the heat dissipation bottom plate 440. The heat generated by the second LED light source 410 is quickly conducted away through the heat dissipation bottom plate 440. Preferably, as Figure 5As shown, the bottom of the second reflector cup 430 and the heat dissipation base plate 440 are fixed by screws 450 and their relative positions are adjustable. When the auxiliary high beam is lit, the spot distribution emitted by the second light source group and the high beam spot emitted by the first light source group 10 cannot coincide ideally, and the auxiliary high beam needs to be finely adjusted to make the two spots consistent. In this embodiment, the screws 450 are located near the middle of the bottom of the second reflector cup 430. By loosening or tightening the screws 450, the position between the second reflector cup 430 and the heat dissipation base plate 440 is finely adjusted, so that the spot emitted by it coincides with the spot emitted by the first light source group 10, ensuring the lighting effect.

[0032] Embodiment 2

[0033] As Figure 6 shown, different from Embodiment 1, this lighting fixture further includes a third light source group 50 located below the first light source group 10. The third light source group 50 includes a third LED light source 510 and an optical path turning member 520 corresponding to the third LED light source 510. The light emitted by the third LED light source 510 changes direction through the optical path turning member and is projected onto the lens 30 along a specified direction. The optical path turning member 520 at least includes an incident surface 521, a first reflection surface 522, a second reflection surface 523, and an exit surface 524. The incident surface 521 corresponds to the light emitting surface of the second LED light source 410. Preferably, the optical path turning member 520 is a transparent polyhedron surrounded by a plurality of curved surfaces and planes. As Figure 7 shown, wherein the incident surface 521 is in a groove shape, and the incident surface 521 corresponds to the light emitting surface of the third LED light source 510, that is, the light emitting surface of the third LED light source 510 corresponds to this groove structure, and as much light as possible emitted by it is projected onto the incident surface 521 for collection and utilization, maximizing the light utilization efficiency.

[0034] Preferably, the incident surface 521 is a rotational surface formed by rotating a polyline. The polyline includes a curve in the middle and straight lines on both sides. The light emitted by the third LED light source 510 is projected onto the surface formed by rotating the curve and the surfaces formed by rotating the straight lines on both sides, directly projected onto the second reflection surface 523 or reflected by the first reflection surface 522 and then projected onto the second reflection surface 523, and finally reflected by the second reflection surface 523 and emitted through the exit surface 524. In this embodiment, both the first reflection surface 522 and the second reflection surface 523 are total internal reflection surfaces, which can reflect all the incident light and avoid light loss. Of course, a high-reflectivity reflective layer can also be coated on the outer sides of the first reflection surface 522 and the second reflection surface 523 to reflect the incident light. In this embodiment, the first reflection surface 522 is a curved reflection surface, and the second reflection surface 523 is a flat reflection surface. Preferably, the exit surface 524 is a plane. For the convenience of description, an xyz space coordinate system is established, where the z-axis is along the optical axis 310 direction of the lens 30, and the yz plane is the symmetry plane of the entire optical system. Then, the polyline in this embodiment rotates 360° around the y-axis to form the incident surface 521, and the angle between the exit surface 524 and the xy plane is 10° - 15°.

[0035] Preferably, there are two third LED light sources 510 and two transparent polyhedrons respectively, and they correspond one by one. That is, the third light source group 50 includes two independent light source modules. Each light source module includes a third LED light source 510 and a transparent polyhedron. The light emitted by each third LED light source 510 is projected onto the incident surface 521 of the corresponding transparent polyhedron, and then projected onto the lens 30 and emitted after passing through the first reflection surface 522, the second reflection surface 523, and the exit surface 524 in sequence. In this embodiment, the two transparent polyhedrons are integrated. The exit surface 524 in the transparent polyhedron is a plane, and the angle θ between the two exit surfaces 524 is 160° - 175°. As Figure 8 shown, it can reduce the distortion generated when the output light of the two light source modules converges, so that the light pattern of the high beam is more perfect. Of course, the exit surface 524 in the transparent polyhedron can also be an inwardly concave curved surface, and the exit surfaces 524 of the two transparent polyhedrons are discontinuous and have an obvious jump.

[0036] Although the embodiments of the present invention are described in the specification, these embodiments are only for reference and should not limit the protection scope of the present invention. All omissions, substitutions, and changes made within the scope of the gist of the present invention should be included in the protection scope of the present invention.

Claims

1. An adjustable lighting fixture, comprising a first light source group, a high-low beam switching mechanism and a lens sequentially arranged along the optical path, characterized in that, The upper half of the lens corresponding to the first light source group is missing. The light rays emitted by the first light source group are projected onto the lens and cover both the upper and lower sides of the optical axis of the lens. It further includes a second light source group disposed in front of the first light source group and corresponding to the missing part of the lens. The second light source group includes a second LED light source, a laser light source, a second reflecting cup corresponding to the second LED light source, and a control switch connected to the second LED light source and the laser light source. The control switch controls the second LED light source and the laser light source to be lit alternately, providing auxiliary light spots in two modes. When the control switch is switched to the second LED light source, an auxiliary high beam with a wider coverage range is output. When switched to the laser light source, an auxiliary high beam with a higher central light intensity is output. The second light source group further includes a heat dissipation bottom plate. The second LED light source and the second reflecting cup are disposed on the heat dissipation bottom plate. The bottom of the second reflecting cup is fixed to the heat dissipation bottom plate by screws and the relative position is adjustable. The screws are located near the middle of the bottom of the second reflecting cup. By loosening or tightening the screws, the position between the second reflecting cup and the heat dissipation bottom plate is finely adjusted so that the light spots emitted by the second light source group and the light spots emitted by the first light source group coincide.

2. The adjustable lighting fixture according to claim 1, wherein The first light source group includes a first reflecting cup and an LED light source corresponding to the focus of the first reflecting cup. The end of the first reflecting cup away from the lens is inclined downward relative to the optical axis of the lens.

3. The adjustable lighting fixture according to claim 1, wherein, A light passing hole is provided on the second reflecting cup. The light rays emitted by the laser light source pass through the light passing hole and then are incident on the second LED light source.

4. The adjustable lighting fixture according to claim 3, characterized in that, The second LED light source includes a plurality of LED chips and phosphor sheets corresponding to each LED chip. The light rays emitted by the laser light source are projected onto the central position of the second LED light source.

5. The adjustable lighting fixture according to claim 1, wherein It further includes a third light source group located below the first light source group. The third light source group includes a third LED light source and an optical path turning member corresponding to the third LED light source.

6. The adjustable lighting fixture according to claim 5, wherein The optical path turning member at least includes an incident surface, a first reflecting surface, a second reflecting surface, and an exit surface. The incident surface corresponds to the light emitting surface of the second LED light source.

7. The adjustable lighting fixture according to claim 6, wherein, The optical path turning member is a transparent polyhedron. The incident surface is in a groove shape. The light rays emitted by the third LED light source are projected onto the incident surface.

8. The adjustable lighting fixture according to claim 6, wherein The incident surface is a rotating surface formed by rotating a multi-segment line. The multi-segment line includes a curve in the middle and straight lines on both sides. The first reflecting surface and the second reflecting surface are total internal reflection surfaces.

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