Flash radar

Abstract

The embodiment of the invention discloses a flash radar, which comprises a light source module, the light source module comprises at least one light emitting module, the light emitting module comprises a light emitter, and the light emitter comprises a plurality of lasers; the at least one light-emitting module comprises a first light-emitting module, the first light-emitting module comprises a light-emitting device and a first diffractive optical element, and the first diffractive optical element is arranged on the light-emitting side of the light-emitting device and used for copying laser beams emitted by the light-emitting device. Even if the number of the lasers included in the illuminator in the first light emitting module is small, the number of the laser beams copied by the first diffractive optical element can be sufficient, namely, the number of the laser beams emitted by the light source module is sufficient, and the field angle requirement of the flash radar is met. The number of lasers included in the light emitter in the first light emitting module is small, the probability that dead points appear in the light emitter can be reduced, and the product yield of the light emitter is improved.

Description

Technical Field

[0001] This application relates to the field of laser detection equipment technology, and more particularly to a flash radar. Background Technology

[0002] Lidar, or laser radar, detects the position, velocity, and other characteristics of targets by emitting lasers of specific wavelengths and directions. It is widely used in ranging systems, tracking and measuring low-flying targets, weapon guidance, atmospheric monitoring, surveying and mapping, early warning, and traffic management. Flash radar, a type of non-scanning radar, captures the entire scene through pulses or continuous waves, rather than scanning point-by-point with a laser beam. Because it has no mechanical movement, it can quickly record the entire scene, avoiding interference caused by target or radar movement during scanning.

[0003] In related technologies, to achieve effective utilization of the light energy at the transmitting end and to measure longer distances and larger field of view, flash radar typically employs addressable transmitting devices, such as one-dimensional or two-dimensional addressable VCSEL arrays, time-division controlled, and matched with optical devices to illuminate a specific field of interest with a certain power, such as a 120° (horizontal) * 40° (vertical) or 120° (horizontal) * 90° (vertical) field of view.

[0004] To save on device trace area, reduce trace complexity, and avoid performance parameter variations caused by differences in electrical parasitic parameters due to excessively long traces, current two-dimensional VCSEL arrays are generally fabricated using a matrix-addressable approach. Due to the one-to-one mapping between the transmitter and receiver in the field of view of a flash radar, each cell in a matrix-addressable VCSEL array requires a specific power based on its ranging capability and corresponding field of view requirements. As the field of view requirement of the flash radar increases, the number of cells at both the transmitter and receiver ends must increase to maintain a certain system resolution. With the device power density remaining constant, this increased number of cells leads to an increase in the area of ​​a single VCSEL chip.

[0005] To ensure the signal strength, signal-to-noise ratio, and coverage of the detected object at the receiving end, the light-emitting points at the transmitting end must not have dead spots (unlit or very weak spots). As the area of ​​a single VCSEL chip increases, the risk of dead spots affecting the number of chips produced from the same wafer increases, thus impacting product yield. Summary of the Invention

[0006] This application provides a flash radar to improve the problem in related technologies where, as the field of view requirement of the flash radar increases, the area of ​​a single VCSEL chip increases, the risk of the number of chips produced from the wafer being affected by dead spots increases, and the product yield is affected.

[0007] In a first aspect, embodiments of this application provide a flash radar, including a light source module, the light source module including at least one light-emitting module, the light-emitting module including a light emitter, the light emitter including a plurality of lasers; the at least one light-emitting module includes a first light-emitting module, the first light-emitting module including a light emitter and a first diffractive optical element, the first diffractive optical element being disposed on the light-emitting side of the light emitter and used to perform replication processing on the laser beam emitted by the light emitter.

[0008] Secondly, embodiments of this application provide a flash radar, including a light source module, the light source module including at least one light-emitting module, the light-emitting module including a light emitter, the light emitter including a plurality of lasers; at least one light-emitting module including a third light-emitting module, the third light-emitting module including a light emitter and a second light-diffusing sheet, the second light-diffusing sheet being disposed on the light-emitting side of the light emitter, so that the third light-emitting module forms a surface light source.

[0009] The flash radar of this application embodiment is designed to include a first light-emitting module. The first light-emitting module includes a first diffractive optical element for replicating the laser beam emitted by the emitter. Thus, even if the number of lasers included in the emitter of the first light-emitting module is small, the number of laser beams replicated by the first diffractive optical element is sufficient, that is, the number of laser beams emitted by the light source module is sufficient to meet the field of view requirements of the flash radar. Furthermore, the smaller number of lasers included in the emitter of the first light-emitting module reduces the probability of dead spots in the emitter, improving the product yield of the emitter. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the structure of the flash radar provided in the first embodiment of this application;

[0012] Figure 2 This is a schematic diagram of the structure of the flash radar provided in the second embodiment of this application;

[0013] Figure 3 This is a schematic diagram of the structure of the flash radar provided in the third embodiment of this application;

[0014] Figure 4 This is a schematic diagram of the structure of the flash radar provided in the fourth embodiment of this application;

[0015] Figure 5This is a schematic diagram of the structure of the flash radar provided in the fifth embodiment of this application;

[0016] Figure 6 This is a schematic diagram of the structure of the flash radar provided in the sixth embodiment of this application;

[0017] Figure 7 This is a schematic diagram of the structure of the flash radar provided in the seventh embodiment of this application;

[0018] Figure 8 This is a schematic diagram of the structure of the flash radar provided in the eighth embodiment of this application;

[0019] Figure 9 This is a schematic diagram of the structure of the flash radar provided in the ninth embodiment of this application;

[0020] Figure 10 This is a schematic diagram of the structure of the flash radar provided in the tenth embodiment of this application;

[0021] Figure 11 This is a schematic diagram of the structure of the flash radar provided in the eleventh embodiment of this application;

[0022] Figure 12 This is a schematic diagram of the structure of the flash radar provided in the twelfth embodiment of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Flash radar;

[0025] 10. Light source module;

[0026] 11. Light-emitting module; 11a. First light-emitting module; 11b. Second light-emitting module; 11c. Third light-emitting module; 11d. Fourth light-emitting module; 111. Light emitter; 1111. Laser; 112. First diffractive optical element; 113. First homogenizer; 114. Second homogenizer; 115. Second diffractive optical element;

[0027] 12. Substrate; 121. First surface; 122. Second surface;

[0028] 13. Bracket;

[0029] 14. Receptacle cavity;

[0030] 20. Launching lens;

[0031] p, first virtual surface; q, second virtual surface; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0033] In the following description, when referring to the accompanying drawings, the same numbers in different drawings denote the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0034] Example 1

[0035] Please see Figure 1 This application provides a flash radar 1, which includes a light source module 10. The light source module 10 includes at least one light-emitting module 11, and the light-emitting module 11 includes a light emitter 111. The light emitter 111 includes multiple lasers 1111.

[0036] Please see Figure 1 At least one light-emitting module 11 includes a first light-emitting module 11a, the first light-emitting module 11a includes a light emitter 111 and a first diffractive optical element (DOE) 112, the first diffractive optical element 112 is disposed on the light-emitting side of the light emitter 111 and is used to perform replication processing on the laser beam emitted by the light emitter 111.

[0037] This application embodiment designs a flash radar 1 including a first light-emitting module 11a. The first light-emitting module 11a includes a first diffractive optical element 112 for replicating the laser beam emitted by the emitter 111. Thus, even if the number of lasers 1111 included in the emitter 111 of the first light-emitting module 11a is small, the total number of laser beams after replication processing by the first diffractive optical element 112 is sufficient. That is, the number of laser beams emitted by the light source module 10 is sufficient to meet the field of view requirements of the flash radar 1. This configuration allows for a smaller number of lasers 1111 in the first light-emitting module 11a provided in this application embodiment, reducing the probability of dead spots in the emitter 111 and improving the product yield of the emitter 111, under the condition that the light source module 10 emits the same laser beam.

[0038] The aforementioned first diffractive optical element 112 can replicate all laser beams emitted by all lasers 1111 in the first light-emitting module 11a, or it can replicate some laser beams emitted by some lasers 1111 in the first light-emitting module 11a, without limitation.

[0039] The aforementioned first diffractive optical element 112 can replicate the laser beam emitted by the laser 1111 in the first light-emitting module 11a N times, where N can be greater than or equal to 2 and less than or equal to 6. For example, N can be 2, 3, 4, 5, 6, etc. For each laser beam emitted by the laser 1111, after being replicated N times by the first diffractive optical element 112, the emitted light energy will become 1 / N of the original. Therefore, the larger N is, the weaker the emitted light energy of the laser beam replicated by the first diffractive optical element 112 will be. The above design, where N is greater than or equal to 2 and less than or equal to 6, ensures that the energy of each laser beam replicated by the first diffractive optical element 112 is sufficient to meet certain ranging distance requirements.

[0040] The aforementioned first diffractive optical element 112 can be used to replicate the laser beam emitted by the laser 1111 along a one-dimensional direction, or it can be used to replicate the laser beam emitted by the laser 1111 along a two-dimensional direction, without limitation. The direction in which the first diffractive optical element 112 replicates the laser beam emitted by the laser 1111 can be perpendicular to the preset direction Z shown in the figure; wherein, in the first light-emitting module 11a, the direction in which the light-emitting device 111 points to the first diffractive optical element 112 is the aforementioned preset direction Z. Figure 1 The image shows an example of a first diffractive optical element 112 used to replicate a laser beam emitted by a laser 1111 along a two-dimensional direction. Specifically, the first diffractive optical element 112 replicates the laser beam emitted by the laser 1111a in one direction of the two-dimensional direction to form laser beams 1111a1 and 1111a2, and replicates it in another direction of the two-dimensional direction to form laser beams 1111a3 and 1111a4.

[0041] Please see Figure 1 The emitter 111 may include a plurality of lasers 1111 arrayed along a first direction X and / or a second direction Y as shown in the figure. The first direction X and the second direction Y may be perpendicular to the aforementioned preset direction Z. Designing the emitter 111 to include a plurality of lasers 1111 arrayed together is beneficial for improving the detection field of view of the flash radar 1. In some embodiments, the emitter 111 may be an array of vertical-cavity surface-emitting lasers (VCSELs).

[0042] Please see Figure 1 The light-emitting module 11 may include a light emitter 111.

[0043] Please see Figure 2The light-emitting module 11 may also include multiple emitters 111 arrayed along the first direction X and / or along the second direction Y; wherein each emitter 111 corresponds to a specific field of view. Designing the light-emitting module 11 to include multiple emitters 111 allows the emitters 111 to be spliced ​​together to correspond to a larger field of view, thus meeting the field of view requirements. By designing the light-emitting module 11 to include multiple emitters 111 to splice together to meet the large field of view requirements, compared with the related technology of designing a large-area emitter to meet the large field of view requirements, which results in a lower yield of the emitter, the number of lasers 1111 included in each emitter 111 can be reduced, thereby reducing the probability of dead spots in the lasers 1111 within the emitter 111 and improving the product yield of the emitter 111.

[0044] It should be noted that since the emitter 111 needs to be lit and powered, a pad area (the area around the laser 111 in the illustration) needs to be reserved on the emitter 111 for wiring. The pad area is usually designed at the edge of the emitter 111. If the light-emitting module 11 includes multiple emitters 111, and a pad area needs to be reserved on each emitter 111, then the first distance h1 between the two lasers 1111 located in the middle of any two adjacent emitters 111 will be unequal to the second distance h2 between two adjacent lasers 1111 within the same emitter 111, resulting in uneven illumination in the field of view. Usually, the first distance h1 is larger than the second distance h2, which will cause a significant dark area between two emitters 111 that does not emit light, resulting in uneven illumination in the field of view and affecting the detection of target objects. In this embodiment, the light source module 10 includes a first light-emitting module 11a. A first diffractive optical element 112 in the first light-emitting module 11a is used to replicate the laser beam emitted by each light emitter 111 to obtain a laser beam array. This allows for the existence of at least one first virtual surface p on the light-emitting side of the first diffractive optical element 112. Within this first virtual surface p, the third distance h1' between two laser beams located at the middle position in adjacent laser beam arrays is equal to the fourth distance h2' between two adjacent laser beams in the same laser beam array; that is, all laser beams are uniformly distributed within the first virtual surface p. Subsequent optical elements such as lenses can be adaptively arranged using the position of this first virtual surface p as the light-emitting surface of the light source module 10.

[0045] See Figure 1 and Figure 2The light source module 10 also includes a substrate 12 and a support 13. The substrate 12 has a first surface 121 and a second surface 122 disposed opposite to each other along the thickness direction; the support 13 is disposed on the first surface 121 and together with the substrate 12 defines a receiving cavity 14. The light-emitting module 11 is disposed corresponding to the receiving cavity 14, wherein the light emitter 111 is housed in the receiving cavity 14, and the first diffractive optical element 112 is mounted on the end of the support 13 opposite to the first surface 121. The design of the substrate 12 and the support 13, and the housing of the light emitter 111 in the receiving cavity 14, can, on the one hand, support and mount the light emitter 11, and on the other hand, avoid crosstalk between the laser beam emitted by the light emitter 111 and the optical signal outside the receiving cavity 14, which is beneficial to improving the detection performance of the flash radar 1. The thickness direction of the substrate 12 can be approximately parallel to the aforementioned preset direction Z, and there is no limitation thereto.

[0046] See Figure 3 and Figure 4 The light source module 10 may include at least two light-emitting modules 11, each arranged in a preset planar array; wherein the preset plane is perpendicular to the preset direction Z. Each light-emitting module 11 corresponds to a specific field of view. By designing the light source module 10 to include at least two light-emitting modules 11, the combined field of view of each light-emitting module 11 can be expanded to meet the field of view requirements. Due to the increase in the number of light-emitting modules 11, the number of lasers 1111 included in the emitter 111 of a single light-emitting module 11 can be reduced, thereby reducing the probability of dead spots in the lasers 1111 within the emitter 111 and improving the product yield of the light-emitting module 11.

[0047] See Figures 3 to 6 If the light source module 10 includes at least two light-emitting modules 11, each light-emitting module 11 can be correspondingly provided with a substrate 12 and a support 13, and the light emitter 111 of each light-emitting module 11 is disposed in the accommodating cavity 14 formed by the corresponding substrate 12 and support 13. (See reference...) Figure 7 and Figure 8If the light source module 10 includes at least two light-emitting modules 11, all light-emitting modules 11 can share the same substrate 12 and support 13. In this case, the substrate 12 and support 13 together define a plurality of accommodating cavities 14 equal in number to the number of light-emitting modules 11. Each light-emitting module 11 is disposed in one accommodating cavity 14, and the emitter 111 of each light-emitting module 11 is disposed in the corresponding accommodating cavity 14 formed by the substrate 12 and support 13. By disposing the emitter 111 of each light-emitting module 11 in a corresponding accommodating cavity 14, the laser beams emitted by the emitters 111 of each light-emitting module 11 can be isolated from each other, making crosstalk less likely. The above design, in which all light-emitting modules 11 share the same substrate 12 and support 13, is beneficial for making the structure of the light source module 10 compact, reducing the assembly steps between the relative positions of each light-emitting module 11, and thus improving assembly efficiency. The substrate 12 can be used to provide power supply signals and control signals to the light emitter 111. In the above design, all light-emitting modules 11 share the same substrate 12, which is beneficial to reduce wiring steps compared to each light-emitting module 11 corresponding to a separate substrate 12.

[0048] Please return to the reference. Figure 3 Adjacent light-emitting modules 11 are separated by a bracket 13. Due to the limitations of the bracket 13 and the assembly and manufacturing processes of the emitters 111 within the adjacent light-emitting modules 11, the distance h3 between the two adjacent lasers 1111 and the two light-emitting modules 11 is not equal to the distance h2 between the two adjacent lasers 1111 and the same emitter 111, resulting in uneven illumination in the field of view. Typically, the distance h3 between the two adjacent lasers 1111 and the two light-emitting modules 11 is much larger than the distance h2 between the two adjacent lasers 1111 and the same emitter 111, which will cause obvious dark areas that do not emit light between the two light-emitting modules 11, resulting in uneven illumination in the field of view and affecting the detection of target objects. In this embodiment, the light source module 10 includes a first light-emitting module 11a. A first diffractive optical element 112 in the first light-emitting module 11a is used to replicate the laser beam emitted from the light emitter 111, obtaining a laser beam array. This allows for the existence of at least one second virtual surface q on the light-emitting side of the first diffractive optical element 112. Within this second virtual surface q, the third distance h1' between two laser beams located at the middle position in adjacent laser beam arrays is equal to the fourth distance h2' between two adjacent laser beams in the same laser beam array; that is, all laser beams are uniformly distributed within the second virtual surface q. Subsequent optical elements such as lenses can be adaptively arranged using the position of this second virtual surface q as the light-emitting surface of the light source module 10.

[0049] See Figure 3 If the light source module 10 includes at least two light-emitting modules 11, each light-emitting module 11 may include one light emitter 111. (See also...) Figure 4 If the light source module 10 includes at least two light-emitting modules 11, each light-emitting module 11 may also include multiple light emitters 111, and there is no limitation on this.

[0050] See Figure 3 and Figure 4 If the light source module 10 includes at least two light-emitting modules 11, all light-emitting modules 11 can be designed to be the first light-emitting module 11a. (See also...) Figure 5 and Figure 6 If the light source module 10 includes at least two light-emitting modules 11, some of the light-emitting modules 11 can also be designed as the first light-emitting module 11a.

[0051] See Figure 5 and Figure 6 If at least two light-emitting modules 11 include a first light-emitting module 11a, the two light-emitting modules 11 may also include a second light-emitting module 11b. The second light-emitting module 11b includes an emitter 111 and a first diffuser 113. In the second light-emitting module 11b, the first diffuser 113 is located on the light-emitting side of the emitter 111 and is mounted on the end of the bracket 13 facing away from the first surface 121, so that the second light-emitting module 11b forms a surface light source. Compared with the related technology where the laser beam is directly output to the downstream lens through the emitter 111, this embodiment uses the first diffuser 113 to make the second light-emitting module 11b form a surface light source. On the one hand, this allows the light-emitting surface of the light-emitting module 11 to be larger and the light intensity distribution to be more uniform, which is beneficial to improving the shortcomings of uneven brightness in different areas after the light is emitted by the light-emitting module in the related technology. On the other hand, compared with the detection by point light source in the related technology, this can improve the shortcomings of target missed detection caused by the interval of the laser beam.

[0052] See Figure 5 The second light-emitting module 11b may include a light emitter 111. (See also...) Figure 6 The second light-emitting module 11b may include multiple light emitters 111. (See also...) Figure 6 If the second light-emitting module 11b includes multiple light emitters 111, since the first light-diffusing plate 113 can make the second light-emitting module 11b form a surface light source, it can also solve the problem caused by the pad area that the first distance h1 between two lasers 1111 located in the middle position in any two adjacent light emitters 111 is not equal to the second distance h2 between two adjacent lasers 1111 in the same light emitter 111, so that the field of view illumination is uniform.

[0053] The above-mentioned light source module 10 includes a first light-emitting module 11a and a second light-emitting module 11b, which can integrate the point light source output of the first light-emitting module 11a and the surface light source output of the second light-emitting module 11b, making the design of the light source module 10 more diverse and conducive to meeting more scenario requirements.

[0054] See Figure 7 and Figure 8 The light source module 10 includes a light-emitting module array, which comprises at least one first light-emitting module 11a and at least two second light-emitting modules 11b arranged along a first direction X. In the light-emitting module array, each first light-emitting module 11a is located between two second light-emitting modules 11b. The first direction X is perpendicular to the aforementioned preset direction Z. Thus, the point light source of the first light-emitting module 11a is used to emit light in the central field of view along the first direction X, which can ensure the concentration of energy and ensure the detection of distant targets. The area light source of the second light-emitting module 11b is used to emit light in the edge field of view along the first direction X, which can achieve overall illumination of the edge field of view, ensuring that small objects, low stakes and other potentially hazardous objects and pedestrians in the blind spot area can be illuminated and detected, thus avoiding missed detection problems.

[0055] Furthermore, if in the light-emitting module array, each first light-emitting module 11a is located between two second light-emitting modules 11b, see [reference]. Figure 7 and Figure 8 The first light-emitting module 11a may include one light emitter 111 or multiple light emitters 111 distributed in an array along the first direction X and / or the second direction Y. The second light-emitting module 11b may include one light emitter 111 or multiple light emitters 111 distributed in an array along the first direction X and / or the second direction Y. It can be flexibly designed according to actual needs, and there is no limitation on it.

[0056] See Figure 9 The flash radar 1 also includes a transmitting lens 20, which is located on the light-emitting side of the light source module 10 and is used to expand the emission field of view corresponding to the light-emitting module 11. By designing the transmitting lens 20 to be located on the light-emitting side of the light source module 10, all light-emitting modules 11 in the light source module 10 can share one transmitting lens 20, realizing a 1-transmit and 1-receive structure under a large field of view. This is beneficial to simplifying the system architecture of the flash radar 1 and simplifying the assembly, light adjustment and other process difficulties.

[0057] If the light source module 10 includes a first light-emitting module 11a / a second light-emitting module 11b, then the emitting lens 20 is located on the light-emitting side of the light source module 10. That is, the emitting lens 20 is located on the light-emitting side of the first diffractive optical element 112 / the first light homogenizer 113, which can expand the emission field of view of the light source after being processed by the first diffractive optical element 112 / the first light homogenizer 113, and realize a larger field of view detection.

[0058] It should be noted that if the light source module 10 includes a first light-emitting module 11a, the position of the emitting lens 20 can be designed based on the first virtual surface p formed by the light-emitting side of the first diffractive optical element 112 in the first light-emitting module 11a, so that the laser beams that are approximately uniformly distributed within the first virtual surface p can have their emission field of view expanded by the emitting lens 20. If the light source module 10 includes a second light-emitting module 11b, the position of the emitting lens 20 can be designed based on the second virtual surface q formed by the light-emitting side of the first light homogenizer 113 in the second light-emitting module 11b, so that the surface light source within the second virtual surface q can have its emission field of view expanded by the emitting lens 20.

[0059] The aforementioned light source module 10 may further include a third light-emitting module (not shown in the figure). The third light-emitting module includes a light emitter 111 and a metasurface structure. Within the third light-emitting module, the metasurface structure is located on the light-emitting side of the light emitter 111. The metasurface structure is used to replicate the laser beam emitted by the light emitter 111 or to enable the third light-emitting module to form a surface light source. Thus, the third light-emitting module can be the same as the first light-emitting module 11a or the second light-emitting module 11b, which will not be described in detail here.

[0060] Example 2

[0061] The difference between this embodiment and Embodiment 1 is that, as shown in the following... Figure 10 At least one light-emitting module 11 includes a third light-emitting module 11c. The third light-emitting module 11c includes an emitter 111 and a second light-diffusing plate 114. The second light-diffusing plate 114 is disposed on the light-emitting side of the emitter 111, so that the third light-emitting module 11c forms a surface light source. Compared with the related technology where the laser beam is directly output to the downstream lens through the emitter 111, this embodiment uses the second light-diffusing plate 114 to make the third light-emitting module 11c form a surface light source. On the one hand, this allows the light-emitting surface of the light-emitting module 11 to be larger and the light intensity distribution to be more uniform. As a result, under the condition that the light source module 10 emits the same laser beam, the number of lasers 1111 in the third light-emitting module 11c provided in this embodiment is less. This also helps to improve the shortcomings of uneven brightness and darkness after the light is emitted by the light-emitting module in the related technology. On the other hand, compared with the detection by point light source in the related technology, it can improve the shortcomings of target missed detection caused by the interval of the laser beam. The third light-emitting module 11c may include one emitter 111 or multiple emitters 111.

[0062] The light source module 10 includes at least two light-emitting modules 11, each arranged in a preset planar array. The direction in which the light emitters 111 point towards the second light-diffusing sheet 114 is a preset direction Z, and the preset plane is perpendicular to the preset direction Z. (See reference...) Figure 11The at least two light-emitting modules 11 also include a fourth light-emitting module 11d. The fourth light-emitting module 11d includes a light emitter 111 and a second diffractive optical element 115. The second diffractive optical element 115 is located on the light-emitting side of the light emitter 111. The fourth light-emitting module 11d may include at least two light emitters 111. The second diffractive optical element 115 is used to replicate the laser beam emitted by each light emitter 111 in the same fourth light-emitting module 11d. Since the fourth light-emitting module 11d includes the second diffractive optical element 115 for replicating the laser beam emitted by the light emitter 111, even if the number of lasers 1111 included in the fourth light-emitting module 11d is small, the number of laser beams replicated by the second diffractive optical element 115 can be sufficient. That is, the number of laser beams emitted by the light source module 10 is sufficient to meet the field of view requirements of the flash radar 1. The fourth light-emitting module 11d includes fewer lasers 1111 in its emitter 111, which reduces the probability of dead spots in the emitter 111 and improves the product yield of the emitter 111.

[0063] The aforementioned fourth light-emitting module 11d includes at least two emitters 111, each of which corresponds to a specific field of view. Thus, the splicing of the emitters 111 in the fourth light-emitting module 11d will correspond to a larger field of view, satisfying the field-of-view requirement. By designing the fourth light-emitting module 11d to include multiple emitters 111 to meet the large field-of-view requirement, compared to the related technologies that design a large-area emitter to meet the large field-of-view requirement, resulting in lower emitter yield, the number of lasers 1111 included in each emitter 111 can be reduced. This reduces the probability of dead pixels in the lasers 1111 within the emitter 111, thereby improving the product yield of the emitter 111.

[0064] See Figure 12 The light source module 10 includes an array of light-emitting modules; the array includes at least one fourth light-emitting module 11d and at least two third light-emitting modules 11c arranged along a first direction X, wherein each fourth light-emitting module 11d is located between two third light-emitting modules 11c in the array; wherein the first direction X is perpendicular to a preset direction Z. Thus, the central field of view along the first direction X uses the point light source of the fourth light-emitting module 11d to ensure concentrated energy and ensure the detection of distant targets; while the edge field of view along the first direction X uses the surface light source of the third light-emitting module 11c to achieve overall illumination of the edge field of view, ensuring that small objects, low stakes and other potentially hazardous objects and pedestrians in the blind spot area are illuminated and thus detected, avoiding missed detection problems.

[0065] In the description of this application, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, in the description of this application, unless otherwise stated, "multiple" means at least two, for example, two, three, four, etc. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0066] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A flash radar, characterized in that, The light source module includes at least one light-emitting module, the light-emitting module includes a light emitter, and the light emitter includes multiple lasers. The at least one light-emitting module includes a first light-emitting module, which includes the light emitter and a first diffractive optical element. The first diffractive optical element is disposed on the light-emitting side of the light emitter and is used to replicate the laser beam emitted by the light emitter.

2. The flash radar according to claim 1, characterized in that, The light source module includes at least two light-emitting modules, and each light-emitting module is arranged in a preset planar array. Wherein, the direction in which the light emitter points to the first diffractive optical element is a preset direction, and the preset plane is perpendicular to the preset direction.

3. The flash radar according to claim 2, characterized in that, The at least two light-emitting modules also include a second light-emitting module; The second light-emitting module includes the light emitter and a first light-diffusing sheet. In the second light-emitting module, the first light-diffusing sheet is located on the light-emitting side of the light emitter, so that the second light-emitting module forms a surface light source.

4. The flash radar according to claim 3, characterized in that, The light source module includes an array of light-emitting modules; The light-emitting module array includes at least one first light-emitting module and at least two second light-emitting modules arranged along a first direction, wherein each first light-emitting module is located between two second light-emitting modules in the light-emitting module array; Wherein, the first direction is perpendicular to the preset direction.

5. The flash radar according to claim 3, characterized in that, The light source module also includes: The substrate has a first surface and a second surface disposed opposite to each other along the thickness direction; and A support is disposed on the first surface and together with the substrate defines at least one receiving cavity. Each light-emitting module is disposed in a corresponding receiving cavity. The light emitter is housed in the receiving cavity. The first diffractive optical element is mounted on the end of the support away from the first surface, and the first light-diffusing plate is mounted on the end of the support away from the first surface.

6. The flash radar according to claim 1, characterized in that, Also includes: The emitting lens is located on the light-emitting side of the light source module and is used to expand the emission field of view corresponding to the light-emitting module.

7. The flash radar according to claim 1, characterized in that, The light-emitting module includes a plurality of light-emitting elements arranged in an array along a first direction and / or along a second direction; And / or, the light emitter includes a plurality of said lasers arranged in an array along a first direction and / or a second direction.

8. A flash radar, characterized in that, The light source module includes at least one light-emitting module, the light-emitting module includes a light emitter, and the light emitter includes multiple lasers. The at least one light-emitting module includes a third light-emitting module, which includes the light emitter and a second light-diffusing sheet. The second light-diffusing sheet is disposed on the light-emitting side of the light emitter, so that the third light-emitting module forms a surface light source.

9. The flash radar according to claim 8, characterized in that, The light source module includes at least two light-emitting modules, each of which is arranged in a preset plane array. The direction in which the light emitter points to the second light-diffusing sheet is a preset direction, and the preset plane is perpendicular to the preset direction. The at least two light-emitting modules further include a fourth light-emitting module, which includes the light emitter and a second diffractive optical element. The second diffractive optical element is located on the light-emitting side of the light emitter. The fourth light-emitting module includes at least two light emitters, and the second diffractive optical element is used to replicate the laser beam emitted by each light emitter in the same fourth light-emitting module.

10. The flash radar according to claim 9, characterized in that, The light source module includes an array of light-emitting modules; The light-emitting module array includes at least one fourth light-emitting module and at least two third light-emitting modules arranged along a first direction, wherein each of the fourth light-emitting modules is located between two of the third light-emitting modules in the light-emitting module array; Wherein, the first direction is perpendicular to the preset direction.

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