Light source and lighting device

Abstract

The utility model provides a light source and a lighting device, and belongs to the technical field of lighting. The light source comprises a laser element, the laser element comprises at least two laser units arranged in the first direction, and the at least two laser units are used for emitting at least two laser beams; the wavelength conversion element is used for at least partially converting the at least two laser beams into excited light with different wavelength ranges; the shaping assembly is arranged between the laser element and the wavelength conversion element, and the shaping assembly comprises a collimating element used for collimating the at least two laser beams; the first diffusion element is arranged between the collimating element and the wavelength conversion element and used for widening the at least two laser beams in a second direction, and the first direction is perpendicular to the second direction. The light source provided by the embodiment of the utility model can improve the uniformity of emergent light.

Description

Technical field

[0001] The utility model relates to the field of lighting, in particular to a light source and a lighting device. [Background Technology]

[0002] Laser remote fluorescence technology uses excitation light from a laser diode to excite a remote fluorescent material. Through wavelength conversion, the converted excitation light is converted into a stimulated light with varying wavelengths. The unconverted excitation light mixes with the converted stimulated light to produce white light. Compared to LED light sources, this technology offers higher brightness and greater energy efficiency. It has been widely used in the lighting field.

[0003] In some scenarios, multiple laser diodes are used to emit excitation light. These laser diodes are arranged in a 1xN (N>1) configuration. The excitation light they emit is then homogenized and then stimulates a wavelength conversion element to achieve higher brightness. However, the excitation light emitted by the laser diodes arranged in this manner creates a long, strip-shaped spot on the wavelength conversion element, resulting in insufficient uniformity in the output light spot. [Utility Model Content]

[0004] The purpose of this application is to provide a light source and an illumination device that can improve the uniformity of the emitted light spot.

[0005] To achieve the above objectives, in a first aspect, embodiments of the present application provide a light source, including:

[0006] A laser element comprising at least two laser units arranged along a first direction, wherein the at least two laser units are configured to emit at least two laser beams;

[0007] a wavelength conversion element, configured to convert at least part of the at least two laser beams into converted light having a different wavelength range; and

[0008] A shaping component is provided between the laser element and the wavelength conversion element, and the shaping component includes:

[0009] a collimating element, configured to collimate the at least two laser beams;

[0010] A first diffusion element is disposed between the collimating element and the wavelength conversion element, and is used to widen the at least two laser beams in a second direction, wherein the first direction and the second direction are perpendicular to each other.

[0011] In some possible embodiments, the first diffusion element includes a main body having a light incident surface and a light exit surface, and the light incident surface and / or the light exit surface of the main body are provided with a curved surface structure, and the curved surface structure is used to widen the at least two laser beams in the second direction.

[0012] In some possible implementations, the curved surface structure is configured as a cylindrical structure, wherein an axis of the cylindrical structure is parallel to the first direction, and an axis of the cylindrical structure is perpendicular to the second direction.

[0013] In some possible implementations, there are multiple cylindrical structures, and the multiple cylindrical structures are arranged along the second direction on the light incident surface and / or the light exit surface of the main body.

[0014] In some possible implementations, the shaping component further includes a second diffusing element disposed between the collimating element and the first diffusing element, wherein the second diffusing element is configured to homogenize the at least two laser beams in a first direction and a second direction.

[0015] In some possible implementations, the at least two laser beams have the same fast axis direction and the same slow axis direction.

[0016] In some possible implementations, the slow axis directions of the at least two laser beams are the same as the first direction.

[0017] In some possible implementations, the collimating element is used to collimate the at least two laser beams in a fast axis direction and a slow axis direction of the at least two laser beams.

[0018] In some possible implementations, a converging element is further included, which is disposed between the shaping component and the wavelength conversion element and is used to converge the at least two shaped laser beams onto the wavelength conversion element.

[0019] In some possible implementations, the converging element converges the at least two shaped laser beams at a preset convergence point, wherein the wavelength conversion element is relatively offset from the preset convergence point.

[0020] In a second aspect, an embodiment of the present application further provides an illumination device comprising the light source as described above; and a collecting component for collecting the converted light emitted by the wavelength conversion element.

[0021] In some possible embodiments, the collection component includes:

[0022] A collecting lens, used to reduce the divergence angle of the stimulated light;

[0023] a collimating lens for collimating the converted light from the collecting lens; and

[0024] The condensing lens is used to condense the converted light from the collimating lens.

[0025] Beneficial effects of this application:

[0026] In the light source of the embodiment of the present application, the collimating element collimates at least two laser beams emitted by the laser units arranged along the first direction, and then widens the at least two laser beams in the second direction through the first diffusion element, so that the sizes of the light spots of the at least two laser beams incident on the wavelength conversion element in the first direction and the second direction are basically equal, so as to improve the uniformity of the emitted light.

Brief Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0028] Figure 1 This is a schematic illustration of a light source in a first direction according to an embodiment of the present application;

[0029] Figure 2 This is a schematic illustration of the light source in the second direction according to an embodiment of the present application. [Specific implementation method]

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] Please combine Figure 1 and Figure 2 , the embodiment of the present application provides a light source, including a laser element 10, a wavelength conversion element 20 and a shaping component 30. It should be noted that, Figure 1 and Figure 2 , the first direction X and the second direction Y are two directions perpendicular to each other.

[0032] The laser element 10 includes at least two laser units 100 arranged along a first direction X. The at least two laser units 100 are used to emit at least two laser beams. The at least two laser beams are used to enter the wavelength conversion element 20. The wavelength conversion element 20 is used to at least partially convert the at least two laser beams into converted light with different wavelength ranges, wherein the converted light is mixed with the unconverted laser beam to form white light.

[0033] At least two laser units 100 can be integrated and packaged within the same housing. Each of the at least two laser units 100 is configured to emit laser beams in the same direction, for example, in the second direction Y. Within the range of the light spot formed by the at least two laser beams, the size of the light spot in the first direction X is greater than the size of the light spot in the second direction Y. The laser light spot incident on the wavelength conversion element 20 is an elongated strip, resulting in insufficient uniformity in the output light.

[0034] Based on this, a shaping component 30 is arranged between the laser element 10 and the wavelength conversion element 20, and the shaping component 30 is used to widen the at least two laser beams in the second direction Y so that the light spots formed on the at least two laser beams incident on the wavelength conversion element 20 have substantially the same size in the first direction X and the second direction Y.

[0035] According to some embodiments of the present application, the shaping component 30 includes a collimating element 300 and a first diffusing element 310. The collimating element 300 is used to collimate the at least two laser beams. The first diffusing element 310 is disposed between the collimating element 300 and the wavelength conversion element 20 and is used to widen the at least two laser beams in the second direction Y. The collimating element 300 collimates the at least two laser beams, thereby reducing the expansion of the at least two laser beams as they travel in space, thereby reducing the size of the light spot. By widening the at least two laser beams in the second direction Y, the first diffusing element 310 can make the sizes of the at least two laser beams in the first direction X and the second direction Y substantially consistent, that is, the light spots of the at least two laser beams incident on the wavelength conversion element 20 are square spots.

[0036] According to some embodiments of the present application, the first diffusion element 310 includes a main body 3100, which has a light incident surface 3101 and a light emitting surface 3102. At least two laser beams are incident on the main body 3100 via the light incident surface 3101, guided by the main body 3100, and emitted from the light emitting surface 3102 of the main body 3100. Figure 2 As shown, the light emitting surface 3102 of the main body 3100 is provided with a curved surface structure 3103, and the curved surface structure 3103 is used to widen at least two laser beams in the second direction Y. Of course, the present application is not limited to Figure 2 In some different embodiments of the illustrated embodiment, a curved surface structure 3103 may be provided on the light incident surface 3101 of the main body 3100 or a curved surface structure 3103 may be provided on both the light incident surface 3101 and the light emitting surface 3102 of the main body 3100 .

[0037] like Figure 2The curved structure 3103 expands the divergence angle of the at least two laser beams in the second direction Y, thereby causing the at least two laser beams to widen as they travel, and gradually approaching their sizes in the second direction Y to their sizes in the first direction X. It will be appreciated that by properly setting the distance between the wavelength conversion element 20 and the first diffusion element 30, the light spot formed incident on the wavelength conversion element 20 can have substantially the same size in the first direction X and the second direction Y, thereby obtaining a square incident light spot.

[0038] like Figure 1 As shown, the curved surface structure 3103 can be configured not to change the divergence angles of the at least two laser beams in the first direction X, so that the at least two laser beams can maintain their original divergence angles and continue to travel after passing through the first diffusion element 310 .

[0039] According to some embodiments of the present application, the curved surface structure 3103 can be set as a cylindrical structure, combined with Figure 1 and Figure 2 The axis of the cylindrical structure (the central axis of the cylindrical structure) is parallel to the first direction X, and the axis of the cylindrical structure is perpendicular to the second direction Y. Therefore, when the at least two laser beams pass through the cylindrical structure, the divergence angle in the second direction Y is changed and widened, while the divergence angle in the first direction X does not change. In the process of continuing to move in space, the sizes of the at least two laser beams in the first direction X and the second direction Y gradually approach each other. Therefore, by reasonably setting the distance between the wavelength conversion element 20 and the first diffusion element 310, the spot of the incident laser beam can be a square spot, thereby improving the uniformity of the output light.

[0040] According to some embodiments of the present application, Figure 2 , the curved surface structure 3103 can be selected as a convex structure provided on the light-emitting surface 3102 of the main body 3100, but the present application is not limited thereto. For example, the curved surface structure 3103 can also be selected as a concave structure provided on the light-emitting surface 3102 of the main body 3100. It can be understood that when the at least two laser beams pass through the concave structure, their divergence angles in the second direction Y will decrease, or they will be converged. However, after traveling a sufficient distance in space, the at least two laser beams will pass through the convergence point and change into divergent beams, and continuously expand their sizes in the second direction Y as they continue to travel. Similarly, the curved surface structure 3103 can also be selected as a convex structure or a concave structure provided on the light-entering surface 3101 of the main body 3100. It should be noted that, Figure 2 In the example shown, the curved surface structure 3103 is provided as a convex structure of the light-emitting surface 3102 of the main body 3100 , which is beneficial for reducing the overall volume.

[0041] According to some embodiments of the present application, Figure 2 As shown, there are multiple cylindrical structures, and the multiple cylindrical structures are arranged along the second direction Y on the light-emitting surface 3102 of the main body 3100. The multiple cylindrical structures respectively change the divergence angle of part of the at least two laser beams in the second direction Y, so that these partially changed divergence angles of the beams mix with each other, thereby improving the overall uniformity of the at least two laser beams in the second direction Y. Optionally, the multiple cylindrical structures can be arranged to be continuously arranged in the second direction Y of the light-emitting surface 3102. It will be understood that in different embodiments, the multiple cylindrical structures can also be optionally arranged on the light-entering surface 3101 of the main body 3100, or in some embodiments, can be simultaneously arranged on the light-entering surface 3101 and the light-emitting surface 3102 of the main body 3100.

[0042] According to some embodiments of the present application, the shaping assembly 30 further includes a second diffusing element 320, which is disposed between the collimating element 300 and the first diffusing element 310. The second diffusing element 320 is configured to homogenize at least the two laser beams in the first direction X and the second direction Y. It is understood that the at least two laser beams emitted by the at least two laser units 100 in the first direction X are susceptible to uneven light distribution across the entire light spot due to the separation of their emission positions. The provision of the second diffusing element 320 facilitates compensating for the uneven light spot by diffusing the at least two laser beams. Optionally, the second diffusing element 320 can be configured as an angular diffuser, for example. Passing through the angular diffuser, the divergence angle of each laser beam is expanded. Thus, before reaching the first diffusing element 30, the light distributions of the laser beams in the first direction X compensate for each other, achieving a uniform effect. Simultaneously, the light distributions of the laser beams in the second direction Y are also compensated accordingly, achieving a uniform effect.

[0043] According to some embodiments of the present application, the collimating element 300 collimates both the fast axis direction and the slow axis direction of at least two laser beams, that is, after at least two laser beams pass through the collimating element 300, both the fast axis direction and the slow axis direction of at least two laser beams are collimated. Figure 1 and Figure 2 The collimating element 300 may be an aspheric lens 3000. The aspheric lens 3000 has different curvatures in the fast axis direction and the slow axis direction of at least two laser beams, so that the fast axis direction and the slow axis direction of at least two laser beams can be collimated at the same time. Figure 1 The collimating element 300 may include at least two aspheric lenses 3000, which are, for example, arranged to correspond to at least two laser units 100 one by one, i.e., each aspheric lens 3000 is used to collimate the laser beam emitted by the corresponding laser 100. Figure 1In the example shown, multiple aspheric lenses 3000 can be integrated and arranged on the same carrier 3001. Optionally, at least two laser units 100 are integrated and packaged in the same housing, and at least two aspheric lenses 3000 are integrated and arranged on the same carrier 3001. In this way, the laser element 10 and the collimating element 300 can be positioned as a whole, which helps to improve the system's progress and simplify the positioning process. In addition, the use of an integrated design helps to reduce the cost of the system. In some different embodiments, the collimating element 300 can also be selected as a cascade combination of different lenses. For example, the collimating element 300 can be selected as a combination of a fast-axis collimating lens and a slow-axis collimating lens arranged in the optical path of at least two laser beams.

[0044] According to some embodiments of the present application, at least two laser units 100 are configured to emit laser beams in the same fast axis direction and slow axis direction. Therefore, at least two aspheric lenses 3000 may have the same optical parameters, such as curvature.

[0045] Furthermore, the fast axis directions of the at least two laser units 100 can be arranged parallel to the second direction Y, and the slow axis directions can be arranged parallel to the first direction X. That is, the at least two laser units 100 are arranged sequentially along their slow axis directions. It can be understood that during the travel of the laser beams emitted by the laser units 100, the fast axis direction expands faster, resulting in a larger spot size in the fast axis direction, while the slow axis direction expands slower, resulting in a smaller spot size in the slow axis direction. Therefore, arranging the at least two laser units 100 along their slow axis directions can, to a certain extent, reduce the difference in spot size between the overall spot of the at least two emitted laser beams in the first direction X and the second direction Y, thereby facilitating the shaping element 30 to shape the overall spot of the at least two laser beams into a square spot.

[0046] According to some embodiments of the present application, the light source further includes a converging element 40, disposed between the shaping element 30 and the wavelength conversion element 20, for converging the at least two shaped laser beams onto the wavelength conversion element 20. The converging element 40 is configured to reduce the spot size of the laser beams incident on the wavelength conversion element 20, thereby increasing the central brightness of the white light output by the wavelength conversion element 20. It will be appreciated that the converging element 40 can be configured as an imaging optical element to image the overall spot shape of the at least two laser beams output by the first diffusing element 310 onto the wavelength conversion element 20. By properly positioning the wavelength conversion element 20 relative to the converging element 40, the spot size incident on the wavelength conversion element 20 can be reduced. The converging element 40 converges the at least two shaped laser beams onto a predetermined convergence point 400, and the wavelength conversion element 20 is disposed near the predetermined convergence point 400 to compress the spot size incident on the wavelength conversion element 20 to the smallest possible size. Optionally, the wavelength conversion element 20 is arranged in front of or behind the preset convergence point 400, that is, the position of the wavelength conversion element 20 relative to the preset convergence point 400 has a small deviation, which makes the light spot incident on the wavelength conversion element 20 remain relatively small and avoids focusing the light spot on the wavelength conversion element 20, so as to avoid the problem of excessive heat accumulation caused by excessive power density at the conversion point of the wavelength conversion element 20.

[0047] The following combination Figure 1 and Figure 2The operating principle of the light source of the present invention is further explained using an example. At least two laser units 100 are arranged along a first direction X, and each of the at least two laser units 100 emits a laser beam. The at least two laser beams emitted by the at least two laser units 100 can be configured to have the same fast axis direction and slow axis direction. The slow axis direction of the at least two laser beams can be configured to be the same as the arrangement direction of the at least two laser units. The collimating element 300 aligns the fast and slow axes of the at least two laser beams to produce at least two collimated laser beams. The second diffusing element 320 then diffuses the at least two laser beams to improve their uniformity. The at least two laser beams, homogenized by the second diffusing element 320, are geometrically combined, forming a uniform and complete light spot. This light spot still appears as a long, strip-shaped spot. The resulting mixed laser beam then enters the first diffusing element 310, which widens the laser beam in the second direction Y while maintaining its shape in the first direction X, thereby shaping it into a square light spot. Furthermore, the first diffusing element 310 also homogenizes the laser beam, further homogenizing it. Consequently, a square light spot with a very uniform light distribution is formed on the incident surface of the wavelength conversion element 20, resulting in high brightness and highly uniform output light from the wavelength conversion element 20.

[0048] Based on the light source of the above embodiment, the embodiment of the present application further provides a lighting device, such as Figure 1 and Figure 2 As shown, the lighting device includes the light source as described above, and also includes a collecting component 50, which is used to collect the output light of the wavelength conversion element 20. The output light can be white light. In some embodiments, a filter can also be set to filter light in a part of the wavelength range to obtain monochromatic output light.

[0049] The collection assembly 50 includes a collection lens 500, a collimating lens 510, and a condensing lens 520. The collection lens 500 is used to collect the converted light from the wavelength conversion element 20 and reduce the divergence angle of the converted light. The collimating lens 510 is used to collimate the converted light from the collection lens 500. The condensing lens 520 is used to focus the converted light from the collimating lens 510.

[0050] The lighting device of the embodiment of the present application can output a high-brightness, highly uniform white light spot and can be widely used in scenes requiring uniform lighting.

[0051] The above is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the scope of protection of the present invention.

Claims

1. A light source, characterized in that: include: The laser element comprises at least two laser units arranged along a first direction, wherein the at least two laser units are configured to emit at least two laser beams; a wavelength conversion element for converting at least part of the at least two laser beams into converted light having a different wavelength range; as well as A shaping component is provided between the laser element and the wavelength conversion element, and the shaping component includes: a collimating element, configured to collimate the at least two laser beams; A first diffusion element is disposed between the collimating element and the wavelength conversion element, and is used to widen the at least two laser beams in a second direction, wherein the first direction and the second direction are perpendicular to each other.

2. The light source according to claim 1, wherein The first diffusion element includes a main body having a light incident surface and a light exit surface. The light incident surface and / or the light exit surface of the main body are provided with a curved surface structure, and the curved surface structure is used to widen the at least two laser beams in the second direction.

3. The light source according to claim 2, characterized in that The curved surface structure is configured as a cylindrical structure, wherein an axis of the cylindrical structure is parallel to the first direction, and an axis of the cylindrical structure is perpendicular to the second direction.

4. The light source according to claim 3, characterized in that There are a plurality of cylindrical structures, and the plurality of cylindrical structures are arranged along the second direction on the light incident surface and / or the light emitting surface of the main body.

5. The light source according to claim 1, wherein The shaping assembly further includes a second diffusion element disposed between the collimating element and the first diffusion element, wherein the second diffusion element is configured to homogenize the at least two laser beams in a first direction and a second direction.

6. The light source according to claim 1, wherein The at least two laser beams have the same fast axis direction and the same slow axis direction.

7. The light source according to claim 1, wherein The slow axis directions of the at least two laser beams are the same as the first direction.

8. The light source according to claim 1, wherein The collimating element is used to collimate the at least two laser beams in a fast axis direction and a slow axis direction of the at least two laser beams.

9. The light source according to claim 1, wherein It also includes a converging element, which is arranged between the shaping component and the wavelength conversion element and is used to converge the at least two shaped laser beams onto the wavelength conversion element.

10. The light source according to claim 9, characterized in that The converging element converges the at least two shaped laser beams at a preset convergence point, wherein the wavelength conversion element is relatively offset from the preset convergence point.

11. A lighting device, characterized in that: include: The light source according to any one of claims 1 to 10; as well as, The collecting component is used to collect the converted light emitted by the wavelength conversion element.

12. The lighting device according to claim 11, characterized in that The collection component includes: A collecting lens, used to reduce the divergence angle of the stimulated light; a collimating lens for collimating the converted light from the collecting lens; and The condensing lens is used to condense the converted light from the collimating lens.

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