Light-emitting device and measuring device

Abstract

The present invention reduces the number of components of a light-emitting device capable of adjusting a plurality of light distributions. This light-emitting device comprises: a light-emitting unit having a first light-emitting element that emits first light in a first direction, and a second light-emitting element that emits second light in the first direction; and a metalens having a substrate that transmits light, and a plurality of microstructures disposed in an effective region of the substrate. The effective region of the metalens has: a first region which is disposed at a position where the first light is incident and in which the plurality of microstructures are configured to form a first light distribution; and a second region which is disposed at a position where the second light is incident and in which the plurality of microstructures are configured to form a second light distribution different from the first light distribution.

Description

Light-emitting device, measuring device

[0001] The technology disclosed in the present specification relates to a light-emitting device and a measuring device.

[0002] With the development of AD (Autonomous Driving) and ADAS (Advanced Driver-Assistance Systems), research and development of LiDAR (Light Detection And Ranging) has been progressing as one of the measuring devices used for grasping the surrounding environment and estimating self-position when a vehicle is traveling. LiDAR includes a light projector that projects (irradiates) laser light onto a measurement target, and a light receiver that receives reflected light returned from the laser light reflected by the measurement target. LiDAR outputs information about the measurement target by measuring the distance to the measurement target based on the difference between the light projection timing at which the light projector emits the laser light and the light reception timing at which the light receiver receives the reflected light.

[0003] Among LiDARs, LiDARs capable of adjusting a plurality of light distributions are known. Specifically, it is a LiDAR including a plurality of light projection optical systems and a plurality of light-emitting elements that emit light to each of the light projection optical systems.

[0004] Japanese Patent Application Laid-Open No. 2023-116279

[0005] Conventional LiDAR has room for improvement such as reducing the number of components.

[0006] The present specification discloses a technology capable of solving the above-described problems.

[0007] The technology disclosed in the present specification can be implemented, for example, in the following aspects.

[0008] (1) The light-emitting device disclosed herein comprises a light-emitting unit having a first light-emitting element that emits first light in a first direction and a second light-emitting element that emits second light in the first direction, and a metalens having a light-transmitting substrate and a plurality of microstructures arranged in an effective region of the substrate, wherein the effective region of the metalens has a first region located at the position where the first light is incident and where the plurality of microstructures are configured to form a first light distribution, and a second region located at the position where the second light is incident and where the plurality of microstructures are configured to form a second light distribution different from the first light distribution. With this light-emitting device, the light emitted from each light-emitting element passes through each region of the metalens, and the light distribution of each light emitted from each region of the metalens is different, so the light distribution of the light emitted from the light-emitting device can be easily changed.

[0009] (2) In the above-mentioned light-emitting device, the first beam angle of the first light emitted from the first region of the metalens and the second beam angle of the second light emitted from the second region of the metalens may be different in a second direction perpendicular to the first direction. With this configuration, the beam angle of the light emitted from the light-emitting device can be easily changed by having the first beam angle of the first light emitted from the first region of the metalens and the second beam angle of the second light emitted from the second region of the metalens different in the second direction.

[0010] (3) In the above-mentioned light-emitting device, the light-emitting device according to claim 1 may have a configuration in which the light-emitting unit comprises a first group of light-emitting elements arranged in a third direction perpendicular to the first direction, and a second group of light-emitting elements arranged in a fourth direction perpendicular to the first direction, wherein the first region of the metalens extends in the third direction and the second region of the metalens extends in the fourth direction. With this configuration, by having a first light emission composed of a plurality of first light-emitting elements and a second group of light-emitting elements composed of a plurality of second light-emitting elements, a plurality of light emission patterns can be selected.

[0011] (4) The above measuring device may be configured to include a light-emitting device according to any one of claims 1 to 3, a light-receiving device, and a controller. With this configuration, the measurement environment can be easily changed by mounting such a light-emitting device on the measuring device.

[0012] Furthermore, the technologies disclosed herein can be implemented in various forms, for example, in the form of a light-emitting device, a measuring device, and the like.

[0013] A block diagram schematically showing the measuring device in the embodiment. A schematic diagram showing the metalens of the first embodiment. An explanatory diagram of the light emitted from the light-emitting device in the embodiment. An explanatory diagram of the light emitted from the light-emitting device in the embodiment.

[0014] A. Embodiments: Embodiments will be described with reference to Figures 1 to 4. Figure 1 shows mutually orthogonal X, Y, and Z axes for specifying directions. The positive X-axis direction is forward, and the negative X-axis direction is backward. The positive Y-axis direction is left, and the negative Y-axis direction is right. The positive Z-axis direction is upward, and the negative Z-axis direction is downward. Note that the positive (negative) X-axis direction is an example of a "first direction".

[0015] A-1. Configuration of the measuring device 10: Figure 1 is a schematic block diagram showing the measuring device 10 in an embodiment. The measuring device 10 in this embodiment is a LiDAR. The measuring device 10 is installed, for example, in a vehicle equipped with AD (automated drive) or ADAS (advanced driver assistance system). The measuring device 10 assists in detecting objects such as people and other vehicles while the vehicle is in motion, and provides various types of information useful for ensuring the safety of the vehicle driver and those around the vehicle, and for reducing damage to objects in the surrounding area while the vehicle is in motion, to other devices and users.

[0016] As shown in Figure 1, the measuring device 10 includes a light emitter 100, a light receiver 400, an information processing device 500, a communication interface 600, and a cover 50.

[0017] (Floodlight) The floodlight 100 comprises a light-emitting device 110 and a control circuit board 210. The light-emitting device 110 is a device that emits light. The configuration of the light-emitting device 110 will be described in detail later.

[0018] The control circuit board 210 is a circuit board on which electronic components for controlling the light emission of the light-emitting device 110 are mounted. The control circuit board 210 controls the power supply circuit (not shown) of the light-emitting device 110.

[0019] (Photodetector, etc.) As shown in Figure 1, the photodetector 400 includes a photodetecting optical system 410, a photodetector 420, and a TOF measuring device 430.

[0020] The light-receiving optical system 410 is an optical system for receiving reflected laser light Lre, which is light that has been reflected back from the measurement target W after being emitted from the light-emitting device 110 (for example, a light beam (laser light), hereinafter referred to as "emitted light Lout"), into the light-receiving unit 420. The light-receiving optical system 410 may be various lenses such as focusing lenses, various filters such as wavelength filters, or reflective mirrors.

[0021] The light-receiving unit 420 is equipped with a light-receiving element. The light-receiving element is, for example, a photodiode. The light-receiving unit 420 receives reflected laser light Lre incident from the light-receiving optical system 410, converts it into a received signal corresponding to the intensity and reception timing of the reflected laser light Lre, and outputs it.

[0022] The cover 50 protects the light-emitting device 110 and the light-receiving device 400 from the external environment. The cover 50 transmits the emitted light Lout from the light-emitting device 110. The cover 50 transmits the transmitted emitted light Lout to the outside and the reflected laser light Lre reflected from the object to be measured W. The cover 50 is positioned in front of the light-emitting device 110 and the light-receiving device 400 (positive X-axis direction). The cover 50 is, for example, a flat plate oriented in the up, down, left, and right directions (YZ plane). The cover 50 is made of a material that transmits the light emitted from the light-emitting device 110 and the reflected laser light Lre. The cover 50 is made of, for example, a transparent material (e.g., plastic).

[0023] The TOF measuring device 430 has, for example, a time measurement IC (integrated circuit) equipped with a TDC (time-to-digital converter) circuit. The TOF measuring device 430 is communicatively connected to the control circuit board 210 and the light receiving unit 420. The TOF measuring device 430 receives a timing signal indicating the light emission timing output from the control circuit board 210 and a light receiving signal output from the light receiving unit 420, and based on these, it determines the difference between the timing at which the emitted light Lout was emitted and the timing at which the reflected laser light Lre was received, that is, the time of flight (TOF) of the laser light. The TOF measuring device 430 outputs a signal corresponding to the determined TOF and the light receiving signal received from the light receiving unit 420.

[0024] The information processing device 500 has a processor. The processor may be, for example, a CPU (central processing unit), an MPU (microprocessing unit), an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), a DSP (digital signal processor), etc. The information processing device 500 is communicatively connected to the TOF measuring device 430. The information processing device 500 receives the signal corresponding to TOF output by the TOF measuring device 430 and the received signal, and generates various information such as the distance to the measurement target W based on these. This information may be, for example, a histogram used in time-correlated single photon counting, the distance to each point of the measurement target W, point cloud information, etc. The information generated by the information processing device 500 is transmitted via the communication interface 600 to an external device 700 that uses this information. The information processing device 500 is a controller.

[0025] The external device 700 may be, for example, a device that creates an environmental map using a point cloud, or a device that performs self-localization (SLAM: Simultaneous Localization and Mapping) using scan matching algorithms such as NDT (Normal Distributions Transform) and ICP (Iterative Closest Point).

[0026] A-2. Configuration of the light-emitting device 110: As shown in Figure 1, the light-emitting device 110 includes a light-emitting array 20 and a metalens 30.

[0027] (Light-emitting array 20) The light-emitting array 20 is composed of a plurality of light-emitting elements or a plurality of light-emitting element arrays (for example, in which light-emitting elements are arranged linearly (one-dimensionally) or planarly (two-dimensionally)). Each light-emitting element is, for example, a laser diode or a surface-emitting type laser light-emitting element (for example, a VCSEL (Vertical Cavity Surface Emitting Laser, hereinafter referred to as "surface-emitting element"). In this embodiment, the light-emitting array 20 is composed of a plurality of surface-emitting type laser light-emitting elements. The light-emitting elements of the light-emitting array 20 are, for example, a surface-emitting element array (for example, a VCSEL array) in which a plurality of surface-emitting elements are arranged two-dimensionally on a substrate (semiconductor substrate, ceramic substrate, etc.). Note that the light-emitting array 20 is an example of a light-emitting unit.

[0028] The light-emitting array 20 is composed of multiple rows of light-emitting elements. Each light-emitting element group has multiple light-emitting elements. The multiple light-emitting elements constituting each light-emitting element group are arranged in a line along one direction (up and down direction (Z-axis direction), hereinafter referred to as the "element arrangement direction"). The multiple rows of light-emitting elements are arranged along a direction perpendicular to the above-mentioned one direction (left and right direction (Y-axis direction), hereinafter referred to as the "group arrangement direction"). Figure 1 and Figure 3, described later, illustrate a configuration in which the light-emitting array 20 has six rows of light-emitting element groups 21, 22, 23, 24, 25, and 26.

[0029] (Metalens 30) Figure 2 is a schematic representation of the metalens 30. As shown in Figure 1, the metalens 30 is positioned between the light-emitting array 20 and the cover 50 on the optical axis of the light (L11, L21) emitted from the light-emitting array 20. As shown in Figure 2, the metalens 30 comprises a substrate 32 and a plurality of metaatoms 34 arranged on the surface of the substrate 32. Various optical properties (e.g., diffusion function, focusing function, collimation function, etc.) can be realized by appropriately designing the shape and size of the metaatoms 34 and the arrangement pattern of the metaatoms 34 on the substrate 32 (hereinafter sometimes simply referred to as "shape of metaatoms 34, etc."). In other words, a single metalens 30 can realize specific optical properties. The metaatoms 34 are an example of a microstructure.

[0030] The substrate 32 is a rectangular plate. The substrate 32 allows light emitted from the light-emitting array 20 to pass through. The surface of the substrate 32 includes a flat emission surface SO (the surface of the metalens) and a flat incidence surface SI (the surface of the metalens) located on the opposite side of the emission surface SO. An effective region Ab is provided on the emission surface SO. The material of the substrate 32 is, for example, glass, TiO ２ SiO ２ It is a synthetic resin. In this embodiment, the substrate 32 is made of glass. The thickness of the substrate 32 may be, for example, 100 nm or more and 3 mm or less.

[0031] The metaatoms 34 are positioned in the effective region Ab of the substrate 32. The metaatoms 34 are fine protrusions that project from the surface of the substrate 32. In this embodiment, the shape of the metaatoms 34 is adjusted so that the metalens 30 functions as a diffusion lens that diffuses light. The distance between adjacent metaatoms 34 is set to be sufficiently small compared to the wavelength of light incident on the metalens 30. The material of the metaatoms 34 is, for example, silicon (Si), glass, or TiO ２ SiO ２ In this embodiment, the material of the metaatom 34 is silicon with a refractive index of about 1.5 to 4. The height of the metaatom 34 from the exit surface SO may be about 1 μm or more and 2 μm or less.

[0032] The effective region Ab of the metalens 30 has multiple divided regions. The multiple divided regions are arranged along the group arrangement direction (left-right direction). The shape of each divided region is rectangular, extending in the element arrangement direction (up-down direction). In this embodiment, the shape of the metaatom 34 in each divided region is designed such that the angle of light distribution of the light incident on the divided region is converted into expanded light that is extended in one direction (for example, left-right direction) and emitted from the metalens 30. The multiple divided regions differ in at least one of the shape, size, and arrangement pattern of the metaatoms 34 placed in each divided region, such that the degree of expansion of the angle of light distribution of the light incident on each divided region differs from one another.

[0033] Figure 2 illustrates a configuration in which the effective region Ab has six divided regions Ab1, Ab2, Ab3, Ab4, Ab5, and Ab6. For example, the first divided region Ab1 and the second divided region Ab2 differ in at least one of the shape, size, and arrangement pattern of the metaatoms 34 placed in each divided region, such that the degree of expansion of the light distribution angle of the light incident on each divided region is different from that of the first divided region Ab1 and the second divided region Ab2.

[0034] (Relationship between the light-emitting array 20 and the metalens 30) Figure 3 is a schematic diagram showing the optical path of the first light L11 emitted from the first light-emitting group 21 in a vertical view of the light-emitting device 110. Figure 4 is a schematic diagram showing the optical path of the second light L21 emitted from the second light-emitting group 22 in a vertical view of the light-emitting device 110.

[0035] Each of the multiple divided regions of the metalens 30 corresponds to each of the multiple light-emitting element groups of the light-emitting array 20. Each divided region is positioned to receive light emitted from the light-emitting element group corresponding to that divided region.

[0036] For example, as shown in Figures 1 and 3, the first divided region Ab1 of the metalens 30 is positioned to receive the first light L11 emitted from the first light-emitting group 21 of the light-emitting array 20. As shown in Figures 1 and 4, the second divided region Ab2 is positioned to receive the second light L21 emitted from the second light-emitting group 22. The same relationship applies to other light-emitting groups and other divided regions. It is preferable that the light emitted from each light-emitting group does not enter other divided regions that do not correspond to that light-emitting group. In this way, the positional relationship between the light-emitting array 20 and the metalens 30 is adjusted so that each light-emitting group and each divided region correspond one-to-one. The first light-emitting group 21 is an example of the first light-emitting group. The second light-emitting group 22 is an example of the second light-emitting group. The first divided region Ab1 is an example of the first region. The second divided region Ab2 is an example of the second region.

[0037] A-3. Operation of the light-emitting device 110: For example, when the measuring device 10 is activated, the light-emitting device 110 sequentially emits light from multiple rows of light-emitting elements at different timings. The light distribution angle of the light emitted from each light-emitting element is assumed to be approximately the same.

[0038] As shown in Figure 3, for example, the first light L11 emitted from the first light-emitting element group 21 is incident on the first divided region Ab1 of the metalens 30. The first light L11 is converted by a plurality of meta-atoms 34 arranged in the first divided region Ab1 to have a first light distribution. The converted first light L11 is emitted from the metalens 30 (hereinafter, the emitted light is referred to as the "first emitted light L12"). The light distribution angle of the first emitted light L12 is more diffuse than the emission angle of the first light L11. The light distribution angle of the first emitted light L12 is an example of the "first light distribution angle".

[0039] As shown in Figure 4, for example, the second light L21 emitted from the second light-emitting element group 22 is incident on the second divided region Ab2 of the metalens 30. The second light L21 is converted by a plurality of metaatoms 34 arranged in the second divided region Ab2 to have a second light distribution. The converted second light L21 is emitted from the metalens 30 (hereinafter, the emitted light is referred to as the "second emitted light L22"). The light distribution angle of the second emitted light L22 is more diffuse than the emission angle of the second light L21. Note that the light distribution angle of the second emitted light L22 is an example of the "second light distribution angle". Note that the first emitted light L12 and the second emitted light L22 are the emitted light outputs described above.

[0040] The left-right beam angle of the first emitted light L12 is greater than the left-right beam angle of the second emitted light L22. In cover 50, the left-right width W1 of the irradiation range of the first emitted light L12 is longer than the left-right width W2 of the second emitted light L22. On the other hand, the up-down beam angle of the first emitted light L12 is the same as the up-down beam angle of the second emitted light L22. In cover 50, the up-down width of the irradiation range of the first emitted light L12 is the same as the up-down width of the irradiation range of the second emitted light L22 (not shown). That is, in cover 50, the irradiation range of the first emitted light L12 extends more in the left-right direction than the irradiation range of the second emitted light L22. Thus, the aspect ratio of the irradiation range of the first emitted light L12 of the light-emitting device 110 and the aspect ratio of the irradiation range of the second emitted light L22 are different.

[0041] The information processing device 500 of the measuring device 10 selects a light received signal from the light receiver 400 that corresponds to the light distribution pattern of the light emitted from the light emitter 110. Based on the selected light received signal, the information processing device 500 generates various information, such as the distance to the object to be measured W.

[0042] A-4. Effects of the present embodiment: As described above, the light-emitting device 110 of the present embodiment can form a plurality of types of light distribution patterns. The light-emitting device 110 forms a plurality of light distribution patterns from the metalens 30, which is a single light projection optical system, by means of the metalens 30 having a plurality of divided regions. The light-emitting device 110 of the present embodiment includes a light-emitting array 20 having six columns of light-emitting element groups and a metalens 30 having six divided regions. The light-emitting device 110 can form six types of light distribution patterns. Accordingly, the light-emitting device 110 can reduce the number of constituent components. The light-emitting device 110 can be reduced in size.

[0043] When the measuring device 10 including the light-emitting device 110 is mounted on a vehicle, the light-emitting device 110 emits a first light L11 from a first light-emitting element group 21 when monitoring a wide area. Since the first light distribution of the first light L11 spreads in the left-right direction, the measuring device 10 can measure a wide range. On the other hand, when monitoring a specific area, the light-emitting device 110 emits a second light L21 from a second light-emitting element group 22. Since the second light distribution of the second light L21 does not spread in the left-right direction, the measuring device 10 can measure a specific target object in detail. The burden on the light-receiving side can be reduced, and the power consumption of the measuring device 10 can be suppressed.

[0044] B. Modifications: The technology disclosed in the present specification is not limited to the above-described embodiments, and can be modified into various forms without departing from the scope of the invention. For example, the following modifications are also possible.

[0045] In the above embodiment, a FLASH type LiDAR is taken as an example to describe the measuring device 10. However, the present invention is not limited to this. For example, a scanning type LiDAR may be used, or an optical measuring device 10 other than LiDAR may be used.

[0046] In the above embodiment, the light-emitting element has a configuration including an LED. However, the present invention is not limited to this, and a configuration including other semiconductor light-emitting elements or a light source such as a light bulb may also be adopted. In addition, although each light-emitting element of each light-emitting element group is the same light-emitting element, they do not have to be the same.

[0047] In the above embodiment, the light-emitting array 20 has six rows of light-emitting elements in the left-right direction, but it does not have to be six rows. For example, the light-emitting array 20 may have five rows of light-emitting elements, seven rows of light-emitting elements, or seven or more rows of light-emitting elements.

[0048] In the above embodiment, the multiple light-emitting element groups are positioned in the left-right direction with respect to the light-emitting array 20, but this does not have to be the case. For example, the multiple light-emitting element groups may be positioned in the up-down direction with respect to the light-emitting array 20. Furthermore, the multiple light-emitting element groups may be positioned in different directions, as long as these directions are perpendicular to the front-back direction. Each of these directions is just one example of a third direction and a fourth direction.

[0049] In the above embodiment, the multiple light-emitting elements of the light-emitting element group are arranged in a single row in the vertical direction relative to the light-emitting array 20, but they do not have to be in a single row. For example, the multiple light-emitting elements may be arranged in two or more rows.

[0050] In the above embodiment, each light-emitting element constituting the group of multiple light-emitting elements is emitted at a different timing, but they may be emitted simultaneously.

[0051] In the above embodiment, the shape and size of the metaatom 34 are adjusted so that the metalens 30 functions as a diffusion lens that diffuses light. However, the shape and size of the metaatom 34 may be adjusted so that it functions as a focusing lens or a collimating lens instead of a diffusion lens. In the above embodiment, the metaatom 34 was placed on the exit surface SO of the substrate 32. However, the metaatom 34 may also be placed on the incident surface SI of the substrate 32.

[0052] In the above embodiment, both the incident surface SI and the exit surface SO of the substrate 32 were flat surfaces. However, one of the incident surface SI and the exit surface SO may be flat, a portion of the incident surface SI may be flat, a portion of the exit surface SO may be flat, and the entire incident surface SI and exit surface SO do not have to be flat. The incident surface SI and the exit surface SO may be curved surfaces, for example. The effective area is not limited to the central region of the substrate 32, but may be a region offset from the center. The effective area is not limited to a portion of the surface of the substrate 32, but may be the entire surface. Among the plurality of metaatoms 34 arranged on the substrate 32, the cross-section of only some of the metaatoms 34 may be elongated in a predetermined direction.

[0053] In the above embodiment, the metalens 30 has six divided regions as shown in Figure 2, but it does not have to have six divided regions. For example, the metalens 30 may have five divided regions, seven divided regions, or seven or more divided regions. Preferably, the number of divided regions of the metalens 30 is the same as the number of rows of light-emitting elements in the light-emitting array. Also, the number of light distribution patterns of the measuring device 10 increases depending on the number of divided regions of the metalens.

[0054] In the above embodiment, the positional relationship between the light-emitting array 20 and the metalens 30 is adjusted so that each light-emitting group corresponds to each divided region in a one-to-one relationship. However, the relationship between each light-emitting group and each divided region does not have to be one-to-one. For example, the relationship between each light-emitting group and each divided region may be one-to-two or two-to-one.

[0055] In the above embodiment, the left-right light distribution angle of the first emitted light L12 in the light-emitting device 110 is greater than the left-right light distribution angle of the second emitted light L22, and the up-down light distribution angle of the first emitted light L12 and the up-down light distribution angle of the second emitted light L22 are the same, but the device is not limited to this. Also, in the above embodiment, the aspect ratio of the first light distribution and the aspect ratio of the second light distribution were different, but they may be the same.

[0056] In the above embodiment, in the light-emitting device 110, the left-right beam angle of the first emitted light L12 is greater than the left-right beam angle of the second emitted light L22, and the up-down beam angle of the first emitted light L12 and the up-down beam angle of the second emitted light L22 are the same, but the up-down beam angle of the second emitted light L22 can be made smaller than the up-down beam angle of the first emitted light L12. As a result, the second beam pattern is narrower than the first beam pattern. On the other hand, the second beam pattern can illuminate a greater distance than the first beam pattern. The measuring device 10 can measure the target W located at a distance by selecting the second light-emitting element group 22.

[0057] In the above embodiment, the cover 50 is positioned in front of the light-emitting device 110 and the light-receiving device 400, but it may also be positioned only in front of the light-emitting device 110. In that case, a separate cover may be provided for the light-receiving device 400. Also, in the above embodiment, the cover 50 is made of a transparent material, but it may be made of other materials as long as it transmits the emitted light Lout. Furthermore, the cover 50 has a shape that widens vertically, but it does not have to be flat; it may be curved.

[0058] In the above embodiment, the light-emitting device may be, for example, a LiDAR used in an in-vehicle autonomous driving system (AD) or advanced driver assistance system (ADAS), or a measuring device used in a system other than AD or ADAS. The light-emitting device 110 may be a device provided in a different device or component than the measuring device 10, for example, a light-emitting device 110 provided in an in-vehicle camera. The light-emitting device 110 may be a device provided in a component for a different purpose than that of a vehicle, for example, a light-emitting device 110 provided in a security camera or a light-emitting device 110 provided in a smartphone camera.

[0059] This international application claims priority based on Japanese Patent Application No. 2025-046582, filed on 21 March 2025, and the entire contents of said Japanese Patent Application No. 2025-046582 are incorporated herein by reference.

[0060] The above description of specific embodiments of the present invention is provided for illustrative purposes only. It is not intended to be exhaustive or to limit the invention to the forms described. Numerous modifications and changes are possible in light of the above description, as will be obvious to those skilled in the art.

[0061] 10: Measuring device 20: Light-emitting array 21: First light-emitting group 22: Second light-emitting group 30: Metalens 32: Substrate 34: Metaatom 50: Cover 100: Light projector 110: Light-emitting device 210: Control circuit board 400: Light receiver 410: Light-receiving optical system 420: Light-receiving unit 430: TOF measuring device 500: Information processing device 600: Communication interface 700: External device Ab1: First divided region Ab2: Second divided region Ab: Effective region IC: Time measurement L11: First light L12: First emitted light L21: Second light L22: Second emitted light Lout: Emitted light Lre: Reflected laser light SI: Incident surface SO: Emitting surface W: Measurement target

Claims

1. A light-emitting device comprising: a light-emitting unit having a first light-emitting element that emits first light in a first direction and a second light-emitting element that emits second light in the first direction; and a metalens having a light-transmitting substrate and a plurality of microstructures arranged in an effective region of the substrate, wherein the effective region of the metalens has a first region located at the position where the first light is incident and where the plurality of microstructures are configured to form a first light distribution, and a second region located at the position where the second light is incident and where the plurality of microstructures are configured to form a second light distribution different from the first light distribution.

2. A light-emitting device according to claim 1, wherein, in a second direction perpendicular to the first direction, the first light distribution angle of the first light emitted from the first region of the metalens and the second light distribution angle of the second light emitted from the second region of the metalens are different.

3. A light-emitting device according to claim 1, wherein the light-emitting unit comprises a first group of light-emitting elements arranged in a third direction perpendicular to the first direction, and a second group of light-emitting elements arranged in a fourth direction perpendicular to the first direction, wherein the first region of the metalens extends in the third direction, and the second region of the metalens extends in the fourth direction.

4. A measuring device comprising a light-emitting device according to any one of claims 1 to 3, a light-receiving device, and a controller.

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