Light-emitting device and lighting device

Abstract

The light-emitting device comprises an LED chip array, and the LED chip array comprises a plurality of LED chips; comprising a light collection device array, the light collection device array comprises a plurality of light collection devices, each LED chip corresponds to one light collection device, and the light collection devices are used for collecting light emitted by the corresponding LED chips and emitting the light after angle adjustment; the concave lens is used for receiving the light emitted by the light collecting device array, adjusting the angle of the light and then emitting the light; the light-emitting angle of the light emitted from the light collecting device array is smaller than that of the LED chip array, and the light-emitting angle of the light emitted from the concave lens is larger than that of the light emitted from the light collecting device array. Light emitted by the LED chip array is collected through the light collection device array for collection and angle adjustment, and then light beams are diverged through the concave lens, so that a plurality of LED chips in the LED chip array are optically equivalent to a large LED chip, and the efficiency of the light-emitting device and the upper limit of power expansion are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lighting, especially a light emitting device and a lighting device using the light emitting device. BACKGROUND

[0002] In the field of remote lighting, it is often required to have high luminous flux, long lighting distance, uniform lighting, and small system size. Current solutions cannot meet all these requirements. In particular, high-power LED chips have many technical limitations such as heat dissipation, efficiency, and cost, and there is a technical upper limit for the total luminous flux and power of the lamp lighting. SUMMARY

[0003] The utility model provides a light emitting device, including LED chip array, LED chip array includes a plurality of LED chips, including light collection device array, light collection device array includes a plurality of light collection devices, each LED chip corresponds to a light collection device, and the light collection device is used to collect the light emitted by the corresponding LED chip and emit after adjusting the angle, further including concave lens, the concave lens is used to receive the light emitted by the light collection device array and emit after adjusting the angle, the light emitting angle of the light emitted from the light collection device array is less than the light emitting angle of the LED chip array, and the light emitting angle of the light emitted from the concave lens is greater than the light emitting angle of the light emitted from the light collection device array.

[0004] The aforementioned light emitting device further includes a laser device, which includes a laser source, a fluorescent conversion material, and a collimating optical system. The laser source emits laser light and excites the fluorescent conversion material to emit stimulated light. The stimulated light is incident on the collimating optical system and is collimated before being emitted to the concave lens.

[0005] The aforementioned light emitting device further includes a metal substrate, and the LED chip array and the laser device are fixedly installed on the metal substrate.

[0006] In the aforementioned light emitting device, the plurality of LED chips in the LED chip array are arranged around the laser device.

[0007] In the aforementioned light emitting device, the surface of the area receiving the light emitted by the laser device is a smooth surface, and at least one surface of the area receiving the emitted light of the light collection device array has a microstructure.

[0008] In the aforementioned light emitting device, the light exit aperture of the collimating optical system is larger than the light exit aperture of the light collection device.

[0009] The aforementioned light emitting device further includes a scattering device located at the rear end of the light path of the light collection device.

[0010] In the aforementioned light emitting device, the array of light collecting devices comprises at least one first light collecting device, and the light exit aperture of the first light collecting device is larger than that of the other light collecting devices.

[0011] In the aforementioned light emitting device, the first light collecting device is surrounded by the other light collecting devices.

[0012] The application provides a lighting device comprising the aforementioned light emitting device, and further comprising a convex lens for receiving the light emitted by the concave lens and adjusting the angle of the light before emitting.

[0013] The light emitted by the array of LED chips is collected and adjusted in angle by the array of light collecting devices, and then the light beam is diverged by the concave lens, so that the plurality of LED chips in the array of LED chips are optically equivalent to one large LED chip, thereby improving the efficiency of the light emitting device and the upper limit of power expansion. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1a Fig. 1 shows the optical structure of the light emitting device in the first embodiment of the application;

[0015] Figure 1b Fig. 2 shows the perspective view of the array of light collecting devices in the embodiment shown in Fig. 1; Figure 1a Fig. 3 shows the top view of the array of light collecting devices in the embodiment shown in Fig. 1;

[0016] Figure 2a Fig. 4 shows the structure of another embodiment of the application;

[0017] Figure 2b Fig. 5 shows the perspective view of the embodiment shown in Fig. 4; Figure 2a Fig. 6 shows the perspective top view of the embodiment shown in Fig. 4;

[0018] Figure 3 Fig. 7 shows the structure of another embodiment of the application;

[0019] Figure 4 Fig. 8 shows the structure of the embodiment of the lighting device of the application. DETAILED DESCRIPTION

[0020] The application provides a light emitting device, and its structure is shown in Fig. 1. Figure 1aThe light emitting device includes an LED chip array 101 including a plurality of LED chips, such as LED chip 101a. It also includes a light collecting device array 102 including a plurality of light collecting devices, such as light collecting device 102a, each LED chip corresponding to one light collecting device, such as LED chip 101a corresponding to light collecting device 102a, the light collecting device 102a being configured to collect light emitted by the corresponding LED chip 101a and emit the light after adjusting the angle of the light. The light emitting device also includes a concave lens 103 configured to receive light emitted by the light collecting device array 102 and emit the light after adjusting the angle of the light. The light emitting angle of the light emitted from the light collecting device array 102 is smaller than the light emitting angle of the LED chip array 101, and the light emitting angle of the light emitted from the concave lens 103 is larger than the light emitting angle of the light emitted from the light collecting device array 102.

[0021] In particular, as Figure 1bAs shown in the top view, a plurality of LED chips form an LED chip array 101, and in this embodiment, there are 7 LED chips and 7 light collecting devices, and they are one-to-one corresponding. The light emitted by each LED chip is collected by the light collecting device and then exits. The light emitted by the LED chip is close to Lambertian emission (emission angle of 180 degrees), so the large-angle light must be collected by the light collecting device to compress the angle and then be fully applied. In this embodiment, the light collecting device array 102 corresponds to 7 light collecting devices, and each light collecting device includes two convex lenses (which can be plano-convex, biconvex or biconcave) placed in front of and behind the light path, for compressing the angle of the large-angle light collected by the corresponding LED chip. The emission angle of the light exiting from the light collecting device array 102 is smaller than the emission angle of the LED chip array 101. In practice, various ways such as a reflective cup, a TIR lens, etc. can be used to realize the light collecting device, which is not described and limited here. The light emitting device further includes a concave lens 103, which has the effect of diverging the incident light, so that the emission angle of the light exiting from the concave lens is larger than the emission angle of the light exiting from the light collecting device array. For example, the light ray 121 in the figure exits from the LED chip 101a at an angle close to 45 degrees, is substantially collimated after passing through the light collecting device 102a, and is again diverged to about 30 degrees after passing through the concave lens 103. It is worth noting that the emission angle mentioned here does not refer to a single light ray (the light ray 121 only represents an example of a light beam), but refers to the emission angle range of all light. That is, the overall emission angle of the light exiting from the light collecting device array 102 is smaller than the overall emission angle of the LED chip array 101, and the overall emission angle of the light exiting from the concave lens 103 is larger than the overall emission angle of the light exiting from the light collecting device array 102. The emission angle in the utility model refers to the full emission angle. For example, the overall emission angle of the LED chip array 101 is 130 degrees, the overall emission angle after passing through the light collecting device array is 20 degrees, and the overall emission angle after passing through the concave lens 103 is 60 degrees.

[0022] In this embodiment, the light angle is first compressed using the light-collecting device array 102, and then the light angle is diverged using the concave lens 103. This seemingly contradictory optical treatment reveals the inventor's ingenuity. The light emitted by each LED chip in the LED chip array 101 is collected and emitted by the light-collecting device array. At the rear end of the optical path of the light-collecting device array, a complete beam of light is formed, meaning the light emitted by each LED chip is pieced together, which can be equivalent to the light emitted by a single large LED chip. After passing through the concave lens 103, a unified divergent light is formed, which is also equivalent to the light emitted by a single large LED chip. Therefore, after the angle compression by the light-collecting device array 102 and the angle divergence by the concave lens 103, the LED chip array 101 is optically equivalent to a single large LED chip. This has three advantages. First, compared to a large LED, multiple small LED chips are easier to dissipate heat, thus making multiple small LEDs more efficient. Second, large LEDs have a power limit; if they are too large, the manufacturing yield and cost will be too high. However, the method of using multiple small LED chips in this embodiment can increase the power almost infinitely by increasing the number of LED chips. Third, large LED chips are driven by a "low voltage, high current" method, while multiple LED chips in this embodiment can be driven by a flexible series-parallel connection, resulting in lower driver chip costs.

[0023] In summary, in this embodiment, the light emitted by the LED chip array 101 is collected and its angle is adjusted by the light collection device array 102, and then the light beam is diverged by the concave lens 103, so that the multiple LED chips in the LED chip array are optically equivalent to a large LED chip, thereby improving the efficiency of the light-emitting device and the upper limit of power expansion.

[0024] In this embodiment, as Figure 1b As shown, the light collection devices are arranged closely together, which reduces the size of the light-emitting device and helps to increase the energy density of the light, thereby increasing the brightness of the emitted light.

[0025] In this embodiment, the concave lens 103 is a plano-concave lens, with its planar surface facing the light-collecting device array 102. This is not a mandatory setting; in practice, a double-concave or even convex-concave lens surface can be used depending on the design, as long as the effect of increasing the emission angle is achieved. Furthermore, the concave surface of the concave lens does not necessarily have to be continuous. For example, a Fresnel lens with a sheet-like shape (its surface includes multiple concave surfaces arranged in a ring array) or a partitioned concave surface shape can also be used, again as long as the effect of increasing the emission angle is achieved. Therefore, in this utility model, "concave lens" refers to an optical element that can diverge the emission angle by using refraction, and does not limit the specific surface shape and form of the optical device.

[0026] In practical applications, there are application occasions that need to consider both the illumination distance and the illumination range. On the basis of the above-mentioned embodiments, the inventors further conceive that the laser device is used to improve the brightness of the light emitting device, and meanwhile the laser device can be integrated into the interior of the light emitting device. The specific structure diagram of the light emitting device is shown in Figure 2a Figure 2b is a perspective view of the present embodiment.

[0027] The light emitting device further comprises a laser device, which comprises a laser source 204, a fluorescent conversion material 205, and a collimating optical system 207. The laser source 204 emits laser 222 to excite the fluorescent conversion material 205 to emit stimulated light 223. The stimulated light 223 is incident on the collimating optical system 207 and is collimated by the collimating optical system 207 and then exits to the concave lens 203. The light emitted by the LED chip array (for example, comprising LED chips 201a and 201b) is collected and compressed in angle (for example, light rays 221) by the light collecting device array (for example, comprising light collecting devices 202a and 202b), and can be combined with the collimated stimulated light (for example, light rays 223) emitted by the laser device into one bundle, and then diverges after passing through the concave lens 203, and is equivalent to the light emitted by a unified light source. Thus, the equivalent light source has a very high central light intensity on the basis of the equivalent large LED chip of the LED chip array, and has a very long illumination distance, which is contributed by the laser device. Thus, the illumination range and the illumination distance can be considered.

[0028] In the present embodiment, preferably, a metal substrate 209 is further included, and the LED chip array and the laser device are fixedly installed on the metal substrate. Thus, the metal substrate simultaneously plays a heat dissipation role for the laser device and the LED chip array. Such a heat dissipation structure is the simplest, and the laser device can be integrated into the interior of the entire light emitting device, and the structure is the most compact.

[0029] In the present embodiment, preferably, the plurality of LED chips in the LED chip array are arranged around the laser device, as shown in Figure 2b Figure 2b ​​In the present embodiment, the exit aperture of the collimating optical system 207 is larger than the exit aperture of the light collecting devices (e.g. 201a and 201b). This has the advantage that a larger aperture can achieve a higher brightness, and thus increasing the exit aperture of the collimating optical system 207 used by the laser device can further enhance the central brightness. Of course, the aperture of the collimating optical system 207 does not necessarily have to be larger than the aperture of the light collecting devices, this is just one way of enhancing the central brightness. In fact, it is also possible for the aperture of the collimating optical system 207 to be equal to or even smaller than the aperture of the light collecting devices. In the present embodiment, the exit aperture of the collimating optical system 207 is larger than the exit aperture of the light collecting devices, and thus more LED chips can be arranged around the laser device, e.g. 8 in the present embodiment. It will be appreciated that more or fewer LED chips can be arranged according to the actual design requirements. In the present embodiment, the laser device is placed in the center of the system, and the LED chip array and the light collecting device array are arranged around the laser device, which is just a preferred design. This can maximize the high brightness characteristics of the laser device, and the optical design is the simplest. In fact, the laser device can also be placed on the side of the light emitting device, i.e. the LED chip array is no longer placed around the laser device. Although the light emitted by the laser device is not located at the center on the concave lens, here the important thing is not the surface distribution but the angular distribution. Therefore, in the subsequent optical processing, the light emitted by the laser device is still located at the central part of the light formed by the LED chip array, i.e. it can still play a role in enhancing the central brightness.

[0030] In Figure 2a In the present embodiment, the inventors mention that a larger exit aperture can improve brightness. Using this idea, even if a laser device is not used, but only an LED chip array is used, the central brightness can also be improved to some extent. In another embodiment, the structural schematic diagram is as shown in Figure 3As shown, the light collection device array at least includes a first light collection device 302b, and the light outlet diameter of the first light collection device is larger than that of other light collection devices 302a. In the embodiment, the LED chip array 301 includes a plurality of LED chips (for example, including LED chips 301a and 301b), and the light collection device array 302 includes a plurality of light collection devices (for example, including light collection devices 302a and 302b), and the light emitted from the light collection device array 302 is divergent after being incident on the concave lens 303. Since the light outlet diameter of the first light collection device 302b is larger than that of other light collection devices 302a, the light 322 emitted by the LED chip 301b corresponding to the first light collection device 302b is more concentrated in the center position in the equivalent large LED chip, and the brightness is higher. Of course, the LED chip 301b can also use a LED chip with higher light density to further improve the central light intensity. In this way, in the embodiment, the application scenario with both lighting distance and lighting range can also be realized at low cost.

[0031] In the embodiment, preferably, a scattering device 308 is further included at the rear end of the light path of the light collection device. The scattering device can be a scattering sheet, or an optical device with a microstructure on the surface, or a microstructure on the surface of the concave lens, and the function is to scatter the incident light, so as to mask the non-uniformity of the LED chip light emitting surface itself. Of course, in actual application, the scattering device can also be omitted, because the uniformity of the LED chip surface itself is constantly improving, and at the same time, the superposition of multiple LED chips can also improve the uniformity.

[0032] Preferably, the first light collection device 302b is surrounded by other light collection devices, and the advantage is that the structure design is simple, but whether the first light collection device 302b is located near the center line of the system or not, the technical effect of enhancing the central light intensity is not affected.

[0033] The utility model also proposes a kind of lighting device, and its structural schematic diagram is as Figure 4 As shown. The lighting device applies the light emitting device as Figure 2a As shown, and it also includes convex lens 410, and the convex lens 410 is used to receive the emergent light of concave lens 403 and is emitted after adjusting angle. In Figure 4In the optical structure, we can understand that the concave lens 403 and the convex lens 410 form a "telescopic beam expanding system", the light emitted by the light collecting device array after compression angle and the collimated light emitted by the laser device are combined into one bundle and then are collimated by the common telescopic beam expanding system. Of course, the convex lens 410 can be used to process the exit light of the concave lens 403 to form any light distribution (the collimated exit is only an example), and since the light emitted from the concave lens 403 is divergent, the convex lens 410 can be relatively close to the concave lens 403, so that the volume of the system can be reduced.

[0034] The light emitting device in the lighting device of the embodiment is different from the light emitting device shown in Figure 2a In the embodiment, the surface of the area for receiving the light 422 emitted by the laser device of the concave lens 403 is a smooth surface, and at least one surface of the area for receiving the exit light 421 of the light collecting device array of the concave lens 403 has a microstructure 403a. In this way, the light emitted by the LED chip array is scattered by the microstructure 403a to shield the unevenness of the light emitting surface of the LED chip, and the light 422 emitted by the laser device is not scattered by the microstructure 403a, so that the maximum light intensity is maintained. In the embodiment, the microstructure 403a is located on the side of the concave lens facing the light collecting device array, and in fact, the microstructure 403a can also be located on the side of the concave lens facing away from the light collecting device array. Of course, in actual application, the microstructure can also be omitted, because the uniformity of the LED chip surface itself is continuously improving, and the superposition of multiple LED chips itself can also improve the uniformity.

[0035] In the utility model, the convex lens refers to the positive lens which has the converging effect on light, and is not limited to the shape of the lens, for example, the plano-convex, concave-convex, double-convex, Fresnel lens partition lens, all belong to the definition category of the convex lens and are within the protection scope of the convex lens.

[0036] It should be noted that the distinguishing technical features between the embodiments of the utility model are not limited to application in the respective embodiments, but can be applied to each embodiment. It is impossible to list all possible combinations in the description of the utility model, therefore, the implementation principle and beneficial effects of each technical feature are illustrated by way of example, and when applied to other embodiments, the person skilled in the art can utilize the implementation principle to achieve the beneficial effects.

[0037] The above only describes the embodiments of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process conversion according to the content of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.

Claims

1. A light emitting device, characterized by: The light-emitting device comprises an LED chip array, the LED chip array comprising a plurality of LED chips; a light collection device array, the light collection device array comprising a plurality of light collection devices, each LED chip corresponding to one light collection device, the light collection device being configured to collect light emitted by the corresponding LED chip and emit the light after adjusting the angle of the light; and a concave lens, the concave lens being configured to receive light emitted by the light collection device array and emit the light after adjusting the angle of the light. The light-emitting angle of the light emitted by the light collection device array is smaller than the light-emitting angle of the LED chip array, and the light-emitting angle of the light emitted by the concave lens is larger than the light-emitting angle of the light emitted by the light collection device array.

2. The light emitting device of claim 1, wherein: The light-emitting device further comprises a laser device, the laser device comprising a laser source, a fluorescent conversion material, and a collimating optical system, the laser source emitting laser light and exciting the fluorescent conversion material to emit stimulated light, the stimulated light being incident on the collimating optical system and being emitted by the collimating optical system to the concave lens after being collimated.

3. The light emitting device of claim 2, wherein: The light-emitting device further comprises a metal substrate, the LED chip array and the laser device being fixedly installed on the metal substrate.

4. The light emitting device of claim 2, wherein: The plurality of LED chips in the LED chip array are arranged around the laser device.

5. The light emitting device of claim 2, wherein: The surface of the area of the concave lens for receiving light emitted by the laser device is a smooth surface, and at least one surface of the area of the concave lens for receiving light emitted by the light collection device array has a microstructure.

6. The light emitting device of claim 2, wherein: The light-emitting aperture of the collimating optical system is larger than the light-emitting aperture of at least one light collection device.

7. The light emitting device of claim 1, wherein: The light-emitting device further comprises a scattering device located at the rear end of the light path of the light collection device.

8. The light emitting device of claim 1, wherein: The light collection device array comprises at least one first light collection device, the light-emitting aperture of the first light collection device being larger than the light-emitting apertures of the other light collection devices.

9. The light emitting device of claim 8, wherein: The first light collection device is surrounded by the other light collection devices.

10. An illumination device, characterized by: The light-emitting device comprises the light-emitting device according to any one of claims 1 to 9, and further comprises a convex lens, the convex lens being configured to receive light emitted by the concave lens and emit the light after adjusting the angle of the light.

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