CN111694161A

CN111694161A - Light emitting module, depth camera and electronic equipment

Info

Publication number: CN111694161A
Application number: CN202010505603.2A
Authority: CN
Inventors: 张学勇
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2020-09-22

Abstract

The application discloses optical transmission module, degree of depth camera and electronic equipment. The light emitting module comprises a light source and an optical component. The light source is used for emitting laser. The optical assembly comprises a first optical element and a second optical element. The laser emitted by the first optical element forms surface light, the laser emitted by the second optical element forms speckles, and both the surface light and the speckles are used for depth calculation. The application embodiment's optical transmission module, degree of depth camera and electronic equipment, the first optical element through the optical transmission module forms the face light with the laser that the light source launched, the second optical element forms the speckle with the laser that the light source launched, make the optical transmission module enough launch the even face light that can be used to closely depth measurement that has high spatial resolution, can launch again and have higher energy and be used to distant depth measurement's speckle, under the condition of the angle of vision that does not increase the power consumption of optical transmission module and do not reduce the optical transmission module, can make the optical transmission module have bigger range finding range.

Description

Light emitting module, depth camera and electronic equipment

Technical Field

The application relates to the technical field of depth ranging, in particular to a light emitting module, a depth camera and an electronic device.

Background

Electronic devices such as cell phones may be equipped with time-of-flight depth cameras to enable measurement of depth information of a scene. Time-of-flight depth cameras typically include a light emitter for emitting light into a scene and a light receiver for receiving light reflected back from objects in the scene, and depth information for the scene can be calculated from the time difference between the time at which the light emitter emits light and the time at which the light receiver receives light. However, the range of existing time-of-flight depth cameras is small.

Disclosure of Invention

The embodiment of the application provides a light emission module, a depth camera and an electronic device.

The light emitting module of the embodiment of the application comprises a light source and an optical component. The light source is used for emitting laser. The optical assembly includes a first optical element and a second optical element. The laser light emitted by the first optical element forms surface light, the laser light emitted by the second optical element forms speckles, and the surface light and the speckles are used for depth calculation.

The depth camera of the embodiment of the application comprises a light emitting module and a light receiving module. The light receiving module is used for receiving the laser emitted by the light emitting module. The light emitting module comprises a light source and an optical component. The light source is used for emitting laser. The optical assembly includes a first optical element and a second optical element. The laser light emitted by the first optical element forms surface light, the laser light emitted by the second optical element forms speckles, and the surface light and the speckles are used for depth calculation.

The electronic equipment of the embodiment of the application comprises a shell and a depth camera. The depth camera is coupled to the housing. The depth camera comprises a light emitting module and a light receiving module. The light receiving module is used for receiving the laser emitted by the light emitting module. The light emitting module comprises a light source and an optical component. The light source is used for emitting laser. The optical assembly includes a first optical element and a second optical element. The laser light emitted by the first optical element forms surface light, the laser light emitted by the second optical element forms speckles, and the surface light and the speckles are used for depth calculation.

The application embodiment's optical transmission module, degree of depth camera and electronic equipment, the first optical element through the optical transmission module forms the face light with the laser that the light source launched, the second optical element forms the speckle with the laser that the light source launched, make the optical transmission module enough launch the even face light that can be used to closely depth measurement that has high spatial resolution, can launch again and have higher energy and be used to distant depth measurement's speckle, under the condition of the angle of vision that does not increase the power consumption of optical transmission module and do not reduce the optical transmission module, can make the optical transmission module have bigger range finding range.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 2 is a schematic block diagram of a depth camera according to some embodiments of the present application;

FIG. 3 is a schematic diagram of a laser pattern including a surface light projected by a light emitting module according to some embodiments of the present disclosure;

FIG. 4 is a schematic view of a laser pattern including speckle projected by a light emission module according to some embodiments of the present disclosure;

FIG. 5 is a schematic diagram of a laser pattern including both surface light and speckle projected by a light emitting module according to some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 7 is a schematic diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 8 is a schematic structural diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 9 is a schematic diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 10 is a schematic diagram of a laser pattern including surface light and speckle projected simultaneously by a light emitting module according to some embodiments of the present disclosure;

FIG. 11 is a schematic structural diagram of a light emitting module according to some embodiments of the present disclosure;

FIG. 12 is a schematic diagram of an electronic device according to some embodiments of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the embodiments of the present application.

Referring to fig. 1, an optical transmitter module 10 is provided in the present embodiment. The light emitting module 10 includes a light source 11 and an optical component 13. The light source 11 is used to emit laser light. The optical assembly 13 includes a first optical element 131 and a second optical element 133. The laser light emitted through the first optical element 131 forms surface light, and the laser light emitted through the second optical element 133 forms speckles, both of which are used for depth calculation.

The light emitting module 10 of the embodiment of the present application forms the laser emitted from the light source 11 into the surface light through the first optical element 131 of the light emitting module 10, and forms the laser emitted from the light source 11 into the speckle through the second optical element 133. Thus, the light emitting module 10 can emit uniform surface light with high spatial resolution which can be used for near-distance depth measurement, and can emit speckles with higher energy which can be used for far-distance depth measurement. The light emitting module 10 can be made to have a larger ranging range without increasing the power consumption of the light emitting module 10 and without reducing the angle of view of the light emitting module 10.

Referring to fig. 1 and fig. 2, a depth camera 100 is further provided in the present embodiment. The depth camera 100 includes a light emitting module 10 and a light receiving module 20. The light emitting module 10 includes a light source 11, an optical assembly 13, a substrate 19, a bracket 15 and a driver 17.

The light source 11 is used for emitting laser light, which may be infrared laser light, ultraviolet laser light, etc., and is not limited herein. The light source 11 may be a Vertical-Cavity Surface-Emitting Laser (VCSEL) or an edge-Emitting Laser (DFB), for example. It should be noted that, when the light source 11 is an edge emitting laser, the number of edge emitting lasers in the light source 11 may be one or more, and is not limited herein.

Referring to fig. 1, 3, 4 and 5, the optical element 13 is disposed on the light emitting path of the light source 11. The optical assembly 13 includes a first optical element 131 and a second optical element 133. In one example, as shown in fig. 1, the first optical element 131 and the second optical element 133 are disposed in this order along the light emitting direction of the light source.

The laser light emitted through the first optical element 131 forms surface light (shown in fig. 3). The first optical element 131 includes first and second

opposing faces

1311, 1313, the first face 1311 being closer to the light source 11 than the second face 1313. The first optical element 131 may be an optical element capable of diffusing and homogenizing the laser beam, such as a diffusion sheet, and is not limited herein. The surface of the diffusion sheet is provided with a granular structure with micro-nano size, and light rays can form uniform surface light after passing through the diffusion sheet. In the embodiment of the application, when the first optical element 131 is a diffusion sheet, a micro-nano granular structure may be formed on the first surface 1311, a micro-nano granular structure may also be formed on the second surface 1313, and micro-nano granular structures may also be formed on both the first surface 1311 and the second surface 1313, which is not limited herein. It can be understood that in the measurement of close-range scenes, there are generally high requirements on the accuracy of the images and the spatial resolution. Therefore, the first optical element 131 is utilized to diffuse and homogenize the laser emitted from the light source 11, which is beneficial to uniformly projecting the laser to the measured scene, each object in the measured scene can be uniformly covered by the laser, the light receiving module 20 can receive the laser reflected by more points in the measured scene, and the spatial resolution can be improved.

The laser light emitted through the second optical element 133 forms speckle (shown in fig. 4). As shown in fig. 1, in one example, the second optical element 133 may include a plurality of microlenses 1335, and the plurality of microlenses 1335 are disposed on the second face 1313 of the first optical element 131. The number, arrangement and focal length of the microlenses 1335 can be determined by a developer according to the distance measuring range, the spatial resolution of the image, and other factors. For example, the number of the plurality of microlenses 1335 may be 10x10, 50x50, 100x100, etc., without limitation. The plurality of microlenses 1335 may be uniformly arranged on the second surface 1313 according to a certain rule, or may be randomly arranged on the second surface 1313, which is not limited herein. It can be understood that, during the measurement of a long-distance scene, because the distance of the measured object is long, the energy of the laser emitted by the light source 11 is greatly attenuated when the laser is transmitted to the measured object, and depth information with high precision cannot be obtained. To obtain an enlarged range of the light emitting module 10, the light power of the light emitting module 10 can be increased, however, this will cause the light emitting module 10 to generate more heat, which affects the working performance of the light emitting module 10. The working performance of the optical transmission module 10 can be ensured by adopting a scheme of reducing the angle of field while extending the range measurement range of the optical transmission module 10, however, this approach cannot satisfy the user's requirement for the imaging range of the remote depth measurement. Therefore, the light emitting module 10 of the embodiment of the present application adopts the second optical element 133 to converge the laser emitted from the light source 11 to form the speckle, so that the light emitting module 10 can emit the speckle having higher energy and being used for remote depth measurement, and the light emitting module 10 can have a larger distance measuring range without increasing the power consumption of the light emitting module 10 and reducing the field angle of the light emitting module 10.

Further, in order to enable the light emitting module 10 to project uniform surface light for short-distance scene measurement and to project speckles with higher energy for long-distance scene measurement, the distance between any two adjacent microlenses 1335 in the second optical element 133 needs to be greater than a predetermined distance, so that a part of the uniform surface light diffused by the diffusion sheet can directly exit through the gap between two adjacent microlenses 1335.

In addition, the plurality of microlenses 1335 may have the same curvature. Thus, the focal lengths of the microlenses 1335 are the same, and a plurality of speckles converged by the microlenses 1335 can be focused on a plane perpendicular to the optical axis of the light source 11 in space, so that the projection effect of the light emitting module 10 can be optimized.

In the present embodiment, the light source 11 in the light emitting module 10 emits laser light, and the laser light is diffused to form surface light after being incident on the first optical element 131. Then, part of the laser light enters the plurality of microlenses 1335, and the remaining part of the laser light is emitted directly through the gap between two adjacent microlenses 1335. Due to the converging effect of the microlenses 1335 on light, the laser light passing through the microlenses 1335 converges to form a high-energy speckle to be projected into the measured scene, and the laser light directly emitted through the gap between the adjacent microlenses 1335 is still projected into the measured scene in the form of uniform surface light (shown in fig. 5). Thus, the light emitting module 10 can be used for measuring a short-distance scene and a long-distance scene, and the light emitting module 10 can have a larger distance measuring range without increasing the power consumption of the light emitting module 10 and reducing the field angle of the light emitting module 10.

Referring to fig. 1, the substrate 19 is used for carrying the light source 11. The substrate 19 may include a circuit board and a stiffener, but is not limited thereto. The circuit board may be any one of a printed circuit board, a flexible circuit board, and a rigid-flex board, and is not limited herein. When the substrate 19 includes a circuit board and a reinforcing plate, the circuit board is disposed between the light source 11 and the reinforcing plate, and the circuit board can be electrically connected to the light source 11 to supply power to the light source 11. The reinforcing plate may be used to support the circuit board and the light source, so as to improve the structural stability of the light emitting module 10.

Referring to fig. 1 again, the bracket 15 is disposed on the substrate 19, and the bracket 15 may be used to fix the optical element 13. In one example, the bracket 15 includes an inner sidewall 153 and a boss 151 extending from the inner sidewall 153. The boss 151 is used to carry the optical assembly 13. As shown in fig. 1, the optical assembly 13 is disposed on the boss 151, and the first face 1311 of the first optical element 131 interferes with the boss 151. The first optical element 131 may be fixedly connected to the boss 151 by gluing, welding, or the like, which is not limited herein. Set up optical component 13 on boss 151, can avoid when light emission module 10 drops or receives the striking, optical component 13 is towards the problem that light source 11 place direction dropped, promotes the stability of the structure of light emission module 10.

Referring to fig. 1, the driver 17 is used for driving the light source 11 to emit laser light. The driver 17 may be an independent driving chip, and the driver 17 may provide a driving current or a driving voltage for the light source 11. The driver 17 may be disposed on a circuit board of the substrate 19 or on a motherboard of the depth camera 100 (shown in fig. 2), without limitation.

Referring to fig. 2, the light receiving module 20 is used for receiving the laser emitted by the light emitting module 10. Specifically, the laser light received by the light receiving module 10 includes surface light that exits through the first optical element 131 and is reflected back by the object to be measured, and speckles that exit through the first optical element 131 and the second optical element 133 and are reflected back by the object to be measured. The surface light can be used for depth calculation of a short-distance object, and the speckles can be used for depth calculation of a long-distance object. Depth information calculated based on the received surface light and/or speckle may form a depth image.

In summary, the light emitting module 10 and the depth camera 100 of the present embodiment form the laser light emitted from the light source 11 into the surface light through the first optical element 131 of the light emitting module 10, and form the laser light emitted from the light source 11 into the speckle through the second optical element 133. Thus, the light emitting module 10 can emit uniform surface light with high spatial resolution which can be used for near-distance depth measurement, and can emit speckles with higher energy which can be used for far-distance depth measurement. The light emitting module 10 can be made to have a larger ranging range without increasing the power consumption of the light emitting module 10 and without reducing the angle of view of the light emitting module 10.

Referring to fig. 6, in some embodiments, the relative position relationship between the first optical element 131 and the second optical element 133 may also be: the second optical element 131 and the first optical element 133 are sequentially disposed along the light emitting direction of the light source 11. At this time, the second optical element 133 may include a plurality of microlenses 1335, and the plurality of microlenses 1335 may be disposed on the first face 1311. In this application embodiment, light source 11 in the light emission module 10 launches laser, and the speckle in order to form projecting in surveyed scene is launched through first optical element 131 after partly laser incides a plurality of microlenses 1335 again, and remaining part laser is launched into first optical element 131 through the clearance between two adjacent microlenses 1335 to form the even surface light of projecting in being surveyed the scene. The light emission module 10 of this application embodiment assembles a plurality of microlenses 1335 to light emission module 10 inboard, not only can avoid the damage of the collision between microlens 1335 and other components and parts to the surface of microlens 1335 in dust and the use, can also weaken the influence to speckle shape and light intensity distribution when vapor condenses on the surface of microlens 1335.

Referring to fig. 7, in some embodiments, when the relative position relationship between the first optical element 131 and the second optical element 133 is along the light emitting direction of the light source 11, and the second optical element 133 and the first optical element 131 are sequentially disposed, the second optical element 133 may further include a substrate 1339 in addition to a plurality of microlenses 1335. The substrate 1339 includes two opposite surfaces, wherein one surface is closer to the first optical element 131 than the other surface. The plurality of lenses 1335 may be disposed on a surface of the substrate 1339 close to the first optical element 131 (as shown in fig. 7), or disposed on a surface of the substrate 1339 far from the first optical element 131 (not shown), which is not limited herein. The bracket 15 includes an inner sidewall 153 and two bosses 151 extending from the inner sidewall 153. One of the bosses 151 is for supporting the first optical element 131, and the other boss 151 is for supporting the second optical element 133. By providing two bosses 151 to support the first optical element 131 and the second optical element 133 respectively, the first optical element 131 and the second optical element 133 can be prevented from falling off toward the light source 11, which is beneficial to improving the structural stability of the light emitting module 10. In this embodiment, the light source 11 in the light emitting module 10 emits laser, and part of the laser passes through the substrate 1339 and the plurality of microlenses 1335 and then exits through the first optical element 131 to form a speckle projected to a measured scene, and the rest of the laser passes through the substrate 1339 and the gap between two adjacent microlenses 1335 and then enters the first optical element 131, so as to form a uniform surface light projected to the measured scene. In the light emitting module 10 of the embodiment of the present application, the first optical element 131 and the second optical element 133 are separately processed and assembled, so that the manufacturing cost and the processing difficulty can be reduced; meanwhile, the plurality of microlenses 1335 are assembled inside the light emitting module 10, so that the damage to the surface of the microlens 1335 caused by the collision between the microlenses 1335 and other components in the dust and using process can be avoided, and the influence on the speckle shape and the light intensity distribution when water vapor is condensed on the surface of the microlens 1335 can be weakened.

Referring to fig. 8, in an example, when the relative position relationship between the first optical element 131 and the second optical element 133 is along the light emitting direction of the light source 11, and the first optical element 131 and the second optical element 133 are sequentially disposed, the second optical element 133 may further include a substrate 1339 in addition to a plurality of microlenses 1335. The substrate 1339 includes two opposite surfaces, wherein one surface is closer to the first optical element 131 than the other surface. The plurality of lenses 1335 may be disposed on a surface of the substrate 1339 close to the first optical element 131 (shown in fig. 8), or disposed on a surface of the substrate 1339 far from the first optical element 131 (not shown), which is not limited herein. The bracket 15 includes an inner sidewall 153 and two bosses 151 extending from the inner sidewall 153. One of the bosses 151 is for supporting the first optical element 131, and the other boss 151 is for supporting the second optical element 133. By providing two bosses 151 to support the first optical element 131 and the second optical element 133 respectively, the first optical element 131 and the second optical element 133 can be prevented from falling off toward the light source 11, which is beneficial to improving the structural stability of the light emitting module 10. In the present embodiment, the light source 11 in the light emitting module 10 emits laser light, and the laser light is incident on the first optical element 131 and then diffused to form surface light. Then, part of the laser light enters the plurality of microlenses 1335 and exits through the substrate 1339 to form speckles projected into the measured scene, and the rest of the laser light enters the gaps between two adjacent microlenses 1335 and exits through the substrate 1339 to form uniform surface light projected into the measured scene. In the light emitting module 10 of the embodiment of the present application, the first optical element 131 and the second optical element 133 are separately processed and assembled, so that the manufacturing cost and the processing difficulty can be reduced; meanwhile, the plurality of microlenses 1335 are assembled inside the light emitting module 10, so that the damage to the surface of the microlens 1335 caused by the collision between the microlenses 1335 and other components in the dust and using process can be avoided, and the influence on the speckle shape and the light intensity distribution when water vapor is condensed on the surface of the microlens 1335 can be weakened.

Referring to fig. 1 and 9, in some embodiments, the light source 11 may include a first light-emitting area 111 and a second light-emitting area 113, and the first optical area 111 and the second light-emitting area 113 may be independently controlled, so that the first optical area 111 and the second light-emitting area 113 may be turned on simultaneously or in a time-sharing manner. The first optical element 131 and the second optical element 133 of the optical assembly 13 are located on the same horizontal plane, and the first light-emitting region 111 is aligned with the first optical element 131, and the second light-emitting region 113 is aligned with the second optical element 133. One side of the first optical element 131 is fixed on the boss 151 of the bracket 15, and the other side is connected with the second optical element 133; the second optical element 133 is fixed to the boss 151 of the holder 15 at one side and connected to the first optical element 131 at the other side. The first optical element 131 and the second optical element 133 may be fixedly connected by gluing, welding, or the like, which is not limited herein.

Referring to fig. 9 and 10, in an example, the first optical element 131 is opposite to the first light emitting region 111, and the second optical element 133 is opposite to the second light emitting region 113. The second optical element 133 includes a substrate 1339 and a plurality of microlenses 1335 disposed on the substrate 1339, wherein the microlenses 1335 are disposed on a surface of the substrate 1339 away from the light source 11. Of course, in other examples, the micro lens 1335 may be disposed on a surface of the substrate 1339 close to the light source 11, and is not limited herein.

Specifically, when the short-distance shooting is performed, since the distance is short, energy attenuation is small when the laser emitted by the light source 11 propagates to the object to be measured, and the laser does not need to be converged by the second optical element 133 to improve the energy of the laser projected into the scene to be measured. Therefore, when performing the short-distance measurement, the driver 17 drives only the first light-emitting region 111 to emit laser light, the laser light emitted from the first light-emitting region 111 passes through the corresponding first optical element 131, the laser light is diffused to form surface light and projected into the measured scene, the light-receiving module 20 can receive the surface light reflected by the object in the measured scene, and a depth image with high spatial resolution can be calculated according to the reflected surface light. When the long-distance shooting is carried out, because the distance of the measured object is long, the energy of the laser emitted by the light source 11 is greatly attenuated when the laser is transmitted to the measured object, and the depth information with high precision cannot be obtained. Therefore, when the long-distance shooting is performed, the driver 17 only drives the second light-emitting region 113 to emit laser, the laser emitted by the second light-emitting region 113 passes through the corresponding second optical element 133, and is converged by the plurality of lenses 1335 of the second optical element 133 to form speckles and project the speckles into the measured scene, the light receiving module 20 can receive the speckles reflected by the object in the measured scene, and the depth image with high precision can be calculated according to the reflected speckles. Thereby, the measurement distance of the light emission module 10 is improved, and the ranging range is increased.

Referring to fig. 10 and 11, in another example, the second optical element 133 includes a third surface 1331 or a fourth surface 1333 opposite to each other, the third surface 1331 is closer to the light source 11 than the fourth surface 1333, and at least one of the third surface 1331 and the fourth surface 1333 is provided with a diffraction grating 1337. The diffraction grating 1337 may be disposed on the third surface 1331 of the second optical element 133, may be disposed on the fourth surface 1333, or may be disposed on both the third surface 1331 and the fourth surface 1333 with the diffraction grating 1337, which is not limited herein. The diffraction grating 1337 has a light splitting function, and can diffract the laser light passing through the diffraction grating 1337 to form speckle in the laser light passing through the diffraction grating 1337.

Specifically, when the short-distance shooting is performed, since the distance is short, energy attenuation is small when the laser emitted by the light source 11 propagates to the object to be measured, and the laser does not need to be converged by the second optical element 133 to improve the energy of the laser projected into the scene to be measured. Therefore, when performing the short-distance measurement, the driver 17 drives only the first light-emitting region 111 to emit laser light, the laser light emitted from the first light-emitting region 111 passes through the corresponding first optical element 131, the laser light is diffused to form surface light and projected into the measured scene, the light-receiving module 20 can receive the surface light reflected by the object in the measured scene, and a depth image with high spatial resolution can be calculated according to the reflected surface light. When the long-distance shooting is carried out, because the distance of the measured object is long, the energy of the laser emitted by the light source 11 is greatly attenuated when the laser is transmitted to the measured object, and the depth information with high precision cannot be obtained. Therefore, when the long-distance shooting is performed, the driver 17 only drives the second light-emitting region 113 to emit laser, the laser emitted by the second light-emitting region 113 passes through the corresponding second optical element 133, and is split by the diffraction grating 1337 arranged on the second optical element 133 to form speckles and project the speckles into a measured scene, the light receiving module 20 can receive the speckles reflected by an object in the measured scene, and a depth image with high precision can be calculated according to the reflected speckles. Thereby, the measurement distance of the light emission module 10 is improved, and the ranging range is increased.

Referring to fig. 12, an electronic device 1000 is further provided in the present embodiment. The electronic device 1000 includes the housing 500 and the depth camera 100 described above. The depth camera 100 is coupled to the housing 500. For example, the housing 500 is formed with a receiving space (not shown) in which the depth camera 100 is received.

The electronic device 1000 may be a mobile phone, a tablet computer, a notebook computer, an intelligent wearable device (such as an intelligent bracelet, an intelligent watch, an intelligent helmet, and an intelligent glasses), a virtual reality device, and the like, without any limitation. In an embodiment of the invention, the electronic device 1000 is a mobile phone.

The electronic device 1000 according to the embodiment of the present application is provided with a depth camera 100. The light emitting module 10 in the depth camera 100 forms the laser emitted by the light source 11 into surface light through the first optical element 131, and forms the laser emitted by the light source 11 into speckles through the second optical element 133, so that the light emitting module 10 can emit uniform surface light with high spatial resolution and capable of being used for near-distance depth measurement, and can emit high-energy speckles capable of being used for far-distance depth measurement. The light emitting module 10 can be made to have a larger ranging range without increasing the power consumption of the light emitting module 10 and without reducing the angle of view of the light emitting module 10.

In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example" or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present application, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. An optical transmission module, comprising:

a light source for emitting laser light;

the laser emitted by the first optical element forms surface light, the laser emitted by the second optical element forms speckles, and the surface light and the speckles are both used for depth calculation.

2. The light emitting module of claim 1, wherein the second optical element and the first optical element are sequentially disposed along a light emitting direction of the light source.

3. The light emission module of claim 2, wherein the first optical element comprises first and second opposing faces, the first face being closer to the light source than the second face, the second optical element comprising a plurality of microlenses disposed on the first face.

4. The light emitting module of claim 2, wherein the first optical element and the second optical element are sequentially disposed along a light emitting direction of the light source.

5. The light emission module of claim 4, wherein the first optical element comprises first and second opposing faces, the first face being closer to the light source than the second face, and the second optical element comprises a plurality of microlenses disposed on the second face.

6. The light emitting module of claim 2 or 4, wherein the second optical element comprises a substrate and a plurality of micro-lenses disposed on the substrate.

7. The light emitting module of claim 6, wherein the plurality of micro-lenses are disposed on a side of the substrate close to the first optical element or on a side of the substrate away from the first optical element.

8. The light emitting module of claim 1, wherein the light source comprises a first light emitting area aligned with the first optical element and a second light emitting area aligned with the second optical element.

9. The light emitting module of claim 8, wherein the second optical element comprises a substrate and a plurality of micro-lenses disposed on the substrate; or

The second optical element comprises a third surface or a fourth surface which are opposite to each other, the third surface is closer to the light source than the fourth surface, and at least one surface of the third surface and the fourth surface is provided with a diffraction grating.

10. A depth camera, comprising:

the light emission module of any of claims 1-9; and

the optical receiving module is used for receiving the laser emitted by the optical emitting module.

11. An electronic device, comprising:

a housing; and

the depth camera of claim 10, in combination with the housing.