A laser device and an electronic device

Abstract

The present invention provides a laser device and an electronic device, comprising: a substrate; a bracket disposed on the substrate; a laser disposed on the substrate and within the bracket; an optical element disposed on the bracket, the optical element including a first surface and a second surface disposed opposite to each other; an adhesive layer disposed on the second surface; a plano-convex lens disposed on the adhesive layer; wherein the first surface faces the laser, and a microlens array is disposed on the first surface, and the ratio of the radius of curvature to the aperture of the microlenses in the microlens array is less than 0.5; wherein the laser beam emitted by the laser sequentially passes through the optical element and the plano-convex lens and exits to form a refracted beam; wherein the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam. The laser device and the electronic device provided by the present invention can reduce energy loss.

Description

Technical Field

[0001] The present invention relates to the field of lasers, and particularly to a laser device and an electronic device. Background Art

[0002] A Vertical-Cavity Surface-Emitting Laser (VCSEL) is a semiconductor whose laser beam emits perpendicularly to the top surface, which is different from the edge-emitting laser that generally emits from the edge. Because the VCSEL is more advanced in function than the edge-emitting laser, with the rapid development of technology, the in-depth research of VCSEL and the expansion of application requirements, the VCSEL not only plays an increasingly important role in fields such as mobile phones and consumer electronics, but also is used in face recognition, 3D sensing, gesture detection, and VR (Virtual Reality) / AR (Augmented Reality) / MR (Mixed Reality), etc.

[0003] When the VCSEL is applied in a TOF ranging module, the laser beam irradiates on the target object and undergoes diffuse reflection. The diffusely reflected light is received by the photosensitive array to perform the ranging work. However, when a larger Field of View is required in the ranging module, the photosensitive element receives a light spot with a high intensity in the middle and low intensities on both sides, which affects the overall ranging effect. At the same time, it also causes a relatively high light emission intensity outside the field of view and an increase in energy consumption. Summary of the Invention

[0004] In view of the defects of the above-mentioned prior art, the present invention provides a laser device and an electronic device. When the laser beam emitted by the laser device irradiates on the target object, the illuminance at the center of the refracted beam or refracted light spot is less than the illuminance at the edge of the refracted beam or refracted light spot. Therefore, after being reflected by the target object, a reflection beam with uniform energy can be formed, thereby improving the ranging effect.

[0005] To achieve the above object and other objects, the present invention provides a laser device, comprising:

[0006] A substrate;

[0007] A bracket, disposed on the substrate;

[0008] A laser, disposed on the substrate and located within the bracket;

[0009] An optical element, disposed on the bracket, the optical element comprising a first surface and a second surface disposed opposite to each other;

[0010] An adhesive layer, disposed on the second surface;

[0011] A plano-convex lens, disposed on the adhesive layer;

[0012] Among them, the first surface faces the laser, a microlens array is arranged on the first surface, and the ratio of the radius of curvature to the aperture of the microlenses in the microlens array is less than 0.5;

[0013] Among them, the laser beam emitted by the laser sequentially passes through the optical element and the plano-convex lens and exits, forming a refracted beam;

[0014] Among them, the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam.

[0015] Further, the microlenses in the microlens array are rotationally symmetric aspherical surfaces, and the function of the cross-section of the microlens is:

[0016]

[0017] Among them, c represents the radius of curvature of the microlens, and k represents the conic constant of the microlens.

[0018] Further, the conic constant is -1.5 to -0.5.

[0019] Further, the central thickness of the plano-convex lens is 0.5 to 1.5 millimeters.

[0020] Further, the conic constant of the plano-convex lens is -1.5 to -0.5.

[0021] Further, the radius of curvature of the plano-convex lens is -10 to -30 millimeters.

[0022] Further, the thickness of the bonding layer is 100 - 200 micrometers.

[0023] Further, the angle at the center of the refracted beam is -20° to 20°.

[0024] Further, the angles at the edge of the refracted beam are 20° to 60° and -20° to -60°.

[0025] Further, the present invention also provides an electronic device, including:

[0026] A laser device for emitting a laser beam, and the laser beam irradiates an object to form a reflected beam;

[0027] A receiving device for receiving the reflected beam;

[0028] Among them, the laser device includes:

[0029] A substrate;

[0030] A bracket arranged on the substrate;

[0031] A laser, disposed on the substrate and located within the bracket;

[0032] An optical element, disposed on the bracket, the optical element including a first surface and a second surface disposed opposite to each other;

[0033] An adhesive layer, disposed on the second surface;

[0034] A plano-convex lens, disposed on the adhesive layer;

[0035] Wherein, the first surface faces the laser, a microlens array is disposed on the first surface, and the ratio of the radius of curvature to the aperture of the microlenses in the microlens array is less than 0.5;

[0036] Wherein, the laser beam emitted by the laser sequentially passes through the optical element and the plano-convex lens and exits, forming a refracted beam, and the refracted beam forms a reflected beam after being reflected by the object;

[0037] Wherein, the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam.

[0038] In summary, the present invention proposes a laser device and an electronic device. In the present invention, a laser is disposed on a substrate, and then an optical element is disposed above the laser. A microlens array is disposed on the surface of the optical element close to the laser, and the surface of the optical element far from the laser is a plane. Then, a plano-convex lens is disposed on this plane. Therefore, when the laser beam emitted by the laser irradiates on the optical element, the optical element can play a role in uniformizing the light. Then, the laser beam irradiates on the target object after passing through the plano-convex lens. Since the plano-convex lens can adjust the energy distribution of the laser beam, when the laser beam irradiates on the target object, a refracted beam (refracted spot) with an illuminance at the center less than that at the edge can be formed. The refracted beam can also have a larger sideslope. After the refracted beam is reflected by the object, a reflected beam with uniform illuminance is formed, that is, a reflected beam with uniform energy is obtained. Therefore, when the receiving device receives this reflected beam, the energy loss outside the field of view angle can be smaller, thereby improving the ranging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 : Schematic diagram of the refracted beam emitted by the laser device in the present invention.

[0040] Figure 2 : Schematic diagram of the laser device of the present invention.

[0041] Figure 3 : Top view of the bracket in the present invention.

[0042] Figure 4 : Another schematic diagram of the laser device in the present invention.

[0043] Figure 5 : In the present invention Figure 2 and Figure 4 the illuminance distribution diagram of the refracted light beam formed by the laser device therein.

[0044] Figure 6 : In the present invention Figure 2 and Figure 4 the beam profile of the illuminance distribution of the refracted light beam formed by the laser device therein in the X direction and the fitting diagram

[0045] Figure 7 : Schematic diagram of the electronic device in the present invention. Specific embodiments

[0046] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0047] It should be noted that the diagrams provided in this embodiment only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the components related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the component layout type may also be more complex.

[0048] Both manned or unmanned vehicles use imaging and image recognition to identify potential collisions or obstacles. In some embodiments, the vehicle can use a 3D imaging system to calculate the distance and approach speed of potential obstacles for collision avoidance and navigation. A 3D imaging system with a longer effective range and a larger angular resolution can allow more time to respond to potential collisions and / or allow higher navigation accuracy.

[0049] In some embodiments, the 3D imaging system can be utilized such that the accuracy of its imaging target and / or environment can be at least partially related to the ratio of the reflected light (the light emitted from the imaging system and reflected back to the imaging system) and the ambient light captured by the imaging system. The captured reflected light can be increased by increasing the intensity or by changing the illumination field of the emitted light. In other embodiments, the 3D imaging system can be utilized such that the accuracy of its imaging target and / or environment can be at least partially related to the angular resolution with which it collects the reflected light and the accuracy of the positions at which it can identify visual features.

[0050] Such as Figure 1As shown in the figure, in this embodiment, a laser device 100 is proposed. The laser device 100 can be used to emit a laser beam. At the same time, since an optical element and a plano-convex lens are provided on the laser device 100, the laser beam exits after passing through the optical element and the plano-convex lens, thus forming a refracted beam 1. When the refracted beam 1 irradiates on the target object 300, a refracted light spot can be formed. In this embodiment, due to the action of the optical element and the plano-convex lens, the illuminance at the center of the refracted beam 1 is less than the illuminance at the edge of the refracted beam 1. Therefore, when the refracted beam 1 is reflected by the target object 300, a reflected beam with uniform illuminance can be formed. Therefore, when the laser device 100 is applied to an electronic device, after the reflected beam is received by the sensing device, the ranging effect can be improved.

[0051] As Figure 1 - Figure 2 shown, the laser device 100 may include a substrate 110. A first pad 111 and a second pad 112 are further provided on the substrate 110, and the first pad 111 is disposed on one side of the second pad 112. The substrate 110 may be a ceramic material with high thermal conductivity such as alumina, beryllium oxide, or silicon carbide. The materials of the first pad 111 and the second pad 112 may be metal materials, such as copper or gold.

[0052] As Figure 2 - Figure 3 shown, Figure 3 The top view of the display bracket 120. A bracket 120 is provided on the substrate 110, and the bracket 120 is used to support the optical element 140. The bracket 120 may be, for example, a square structure. Of course, the bracket 120 may also be a circular or oval structure. The bracket 120 is, for example, perpendicular to the substrate 110. The material of the bracket 120 may be resin or alumina ceramic material. The bracket 120 is, for example, adhesively mounted on the substrate 110. An optical element 140 is provided on the bracket 120, and a laser 130 is provided on the substrate 110, and the laser 130 is located inside the bracket 120. The laser 130 may be a vertical cavity surface emitting laser, and the wavelength of the laser 130 may be 905 nm, 940 nm, 1350 nm or other wavelengths. Of course, in some embodiments, to reduce the volume of the laser device 100, a stepped portion may also be provided at the top of the bracket 120, and the stepped portion may be used to place the optical element 140.

[0053] As Figure 2As shown, in this embodiment, the laser 130 is disposed on the first pad 111. For example, the negative electrode of the laser 130 is soldered to the first pad 111 by silver paste / gold tin, and the positive electrode of the laser 130 is connected to the second pad 112 by a gold wire 113. When a voltage is applied to the first pad 111 and the second pad 112, the laser 130 is excited, so that the laser 130 emits a laser beam. Since the substrate 110 can be a ceramic material with high thermal conductivity such as alumina, beryllium oxide, silicon carbide, etc., the thermal expansion systems of the ceramic substrate and the vertical cavity surface emitting laser on the gallium arsenide substrate are close. When the thermal expansion systems of the two are close, stress can be reduced and reliability can be improved. And because the ceramic substrate has high thermal conductivity and good insulation, thermoelectric separation can be achieved.

[0054] As Figure 2 shown, in this embodiment, an optical element 140 is disposed on the top of the bracket 120. The optical element 140 can play a role in homogenizing light, that is, improving the energy uniformity of the laser beam, thereby improving the energy utilization rate of the laser beam. The optical element 140 can include a first surface and a second surface. The first surface and the second surface are oppositely arranged. The first surface faces the substrate 110, for example, and the second surface faces away from the substrate 110, for example. That is, the back surface of the optical element 140 is the first surface, and the front surface of the optical element 140 is the second surface. A microlens array is also disposed on the first surface. The microlens array can include a plurality of microlenses 141. The microlenses 141 also face the substrate 110 or the laser 130. In this embodiment, the optical element 140 can be a diffuser, and the optical element 140 can also adjust the shape / divergence angle / light intensity distribution of the laser beam.

[0055] As Figure 2 shown, in this embodiment, the microlens 141 can be a rotational quadric surface, and the function of the cross section of the microlens 141 is, for example:

[0056]

[0057] where c represents the radius of curvature of the microlens, and k represents the conic constant of the microlens.

[0058] As Figure 2As shown, in this embodiment, the conical constant of the microlens 141 is, for example, -1.5 to -0.5, such as -1.0. The ratio of the radius of curvature to the aperture of the microlens 141 can be less than 0.5, such as 0.2 or 0.25. For example, when the radius of curvature is 0.015 mm and the aperture of the microlens 141 is 0.08 mm, the ratio of the radius of curvature to the aperture of the microlens 141 is 0.18. By setting the microlens 141 with these parameters, the light homogenization effect can be improved, that is, by improving the divergence angle / light illumination distribution / spot intensity of the laser beam, the light homogenization effect can be achieved. In this embodiment, by making the ratio of the radius of curvature to the aperture of the microlens 141 less than 0.5, a larger-angle spot can be formed, and at the same time, a spot with uniform energy distribution can be obtained.

[0059] As Figure 4 shown, to further improve the energy distribution of the laser beam, this embodiment proposes another laser device 100. The difference between this laser device 100 and Figure 2 is that a plano-convex lens 160 is provided on the optical element 140. In this embodiment, first, an adhesive layer 150 is provided on the second surface of the optical element 140. The thickness of the adhesive layer 150 can be 100 - 200 microns, such as 150 microns or 180 microns. Then, the plano-convex lens 160 is provided on the adhesive layer 150, and the plane of the plano-convex lens 160 is in contact with the adhesive layer 150. The conical constant of the plano-convex lens 160 can be -1.5 to -0.5. The radius of curvature of the plano-convex lens 160 is, for example, -10 mm to -30 mm, such as -15 mm. The "-" indicates the bending direction of the plano-convex lens 160 and does not represent the size. The central thickness of the plano-convex lens 160 can be 0.5 - 1.5 mm, such as 1.0 mm or 1.2 mm. The plano-convex lens 160 can adjust the energy distribution of the laser beam again, and while obtaining a better energy distribution, the energy utilization rate can also be improved. It should be noted that the adhesive layer 150 is, for example, a transparent glue, and the adhesive layer 150 can have a high transmittance to the wavelength of the laser 130. Of course, the optical element 140 and the plano-convex lens 160 can also be integrally calendered or micro-lenses 141 or convex lenses can be etched on both sides. By setting it like this, the laser beam emitted by the laser 130 can pass through the optical element 140 and the plano-convex lens 160 in sequence and exit to form a refracted beam, and the refracted beam finally irradiates on the target object.

[0060] As Figure 1 and Figure 4As shown, in this embodiment, after the laser 130 is lit, the laser 130 emits a laser beam. After the laser beam passes through the microlens 141 and the plano-convex lens 160, a refracted beam 1 is formed. At this time, due to the combined action of the microlens 141 and the plano-convex lens 160, the illuminance at the center of the refracted beam 1 is less than the illuminance at the edge of the refracted beam 1. In order to enable the plano-convex lens 160 to better adjust the energy distribution of the laser beam in this embodiment, the ratio of the radius of curvature to the aperture of the microlens 141 is defined as A. Then, the ratio of the radius of curvature to the aperture of the plano-convex lens 160 is set to 25A - 75A. At the same time, the ratio of the aperture of the plano-convex lens 160 to the aperture of the microlens 141 can be greater than 20, and the ratio is, for example, 20 - 40. By designing the parameter relationship between the plano-convex lens 160 and the microlens 141, when the laser beam passes through the microlens 141 and the plano-convex lens 160 in sequence, the energy distribution of the laser beam can be adjusted, and a refracted beam with the illuminance at the center less than the illuminance at the edge can be obtained.

[0061] As Figure 1 and Figure 5 shown, Figure 5 shown as Figure 2 and Figure 4 the illuminance distribution diagrams of the refracted beams formed by the laser device 100 in. Figure 5 The left diagram in is obtained by exciting the Figure 2 laser device 100 in, Figure 5 and the right diagram in is obtained by exciting the Figure 4 laser device 100 in. In this embodiment, the laser 130 is a 10*10 array with a divergence angle of 21°. The distance between the microlens 141 and the laser 130 is 0.4 mm. The aperture of the microlens 141 is 0.06*0.08 mm (square aperture array). The radius of curvature of the microlens 141 is 0.015 mm. The conic constant of the microlens 141 is -1. The aperture of the plano-convex lens 160 is 3*3 mm. The radius of curvature of the plano-convex lens 160 is -10 mm. The conic constant of the plano-convex lens 160 is -1. The central thickness of the plano-convex lens 160 is 0.6 mm. Then, the refracted light spots formed by the laser device 100 in Figure 2 and Figure 4 are received by the receiver respectively. By comparison, it can be seen that the angular range of the refracted beam 1 in the left diagram is larger than that of the refracted beam 1 in the right diagram, and the illuminance at the center of the refracted beam 1 in the left diagram is greater than the illuminance at the edge of the refracted beam 1. The illuminance at the center of the refracted beam 1 in the right diagram is less than the illuminance at the edge of the refracted beam 1. Therefore, it can be known that by setting the plano-convex lens 160 on the optical element 140, the plano-convex lens 160 can adjust the energy distribution of the laser beam again, so that the energy of the refracted beam 1 is more concentrated, and the light diffused in the outer circle becomes less. As a result, the illuminance at the center of the refracted beam 1 is less than the illuminance at the edge of the refracted beam 1. Therefore,Figure 2 and Figure 4 When the laser devices 100 in Figure 4 are respectively disposed inside the electronic device, after the refraction beam 1 formed by the laser device 100 in Figure 5 - Figure 6 is reflected by the target object, a reflected beam with uniform illuminance or uniform energy can be formed. Therefore, the reflected beam can be better received by the receiving device, thereby improving the measurement effect and at the same time improving the energy utilization rate. As Figure 6 shown, Figure 2 and Figure 4 are the beam profiles and fitting diagrams of the illuminance distribution of the refraction beam formed by the laser device 100 in the X direction. In this embodiment, the beam profile in the X direction at y = 0 in Figure 5 is taken and normalized with the central intensity to obtain the curve in Figure 6 .

[0062] Figure 6 In Figure 2 , the curve L1 represents the fitting diagram of the beam profile of the illuminance distribution of the refraction beam formed by the laser device 100 in the X direction in Figure 6 , the curve L2 represents the fitting diagram of the beam profile of the illuminance distribution of the refraction beam formed by the laser device 100 in the X direction in Figure 4 , and the curve L3 in Figure 6 represents the illuminance fitting diagram of the curve L2. As can be seen from Figure 6 , the curve L2 fits the curve L3 more closely than the curve L1, and the angular range of the curve L2 is smaller than that of the curve L1. As can be seen from Figure 6 , when it is between 0° and 20°, the illuminance of the curve L2 between 0° and 20° is less than the illuminance of the curve L2 between 20° and 60°. Since the refraction beam is a symmetric structure, the illuminance of the curve L2 between 0° and -20° is less than the illuminance of the curve L2 between -20° and -50°. Therefore, -20° to 20° can be defined as the center of the refraction beam, and -20° to -50° and 20° to 50° can be defined as the edges of the refraction beam. Comparing the curve L1 and the curve L2, the illuminance of the curve L1 between 0° and 20° is equal to or substantially equal to the illuminance of the curve L2 between 0° and 20°, and the illuminance of the curve L1 between 20° and 60° is less than the illuminance of the curve L2 between 20° and 60°. And as can be seen from Figure 6 , the divergence angle of the curve L1 is greater than that of the curve L2, but the curve L2 has a larger sideslope. Therefore, when Figure 4 , the energy loss of the refraction beam formed by the laser device 100 in the field of view angle is smaller, so it can be better applied to the electronic device. When Figure 4When the laser device 100 is applied in an electronic device, since the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam, after the refracted beam is reflected by the target object, a reflected beam with uniform illuminance can be formed, which can be more easily received by the sensor.

[0063] As Figure 7 shown, in this embodiment, an electronic device 10 is proposed. The electronic device 10 may include a laser device 100 and a receiving device 200. The laser device 100 and the receiving device 200 may be disposed in adjacent positions. The laser device 100 is configured to emit a refracted beam 1. The refracted beam 1 irradiates on the target object 300 to form a reflected beam 2. It should be noted that the refracted beam 1 irradiates on the target object 300 to form a light spot. Therefore, what the receiving device 200 receives for the reflected beam 2 is the reflected light spot. Since a photosensitive element is disposed in the receiving device 200, the reflected beam 2 can be received by the receiving device 200, and the photosensitive element can convert the optical signal into an electrical signal; then, the electronic device 10 calculates the time difference between the time when the laser device 100 emits the refracted beam 1 and the time when the receiving device 200 receives the reflected beam 2, and further obtains the depth information of the target object 300. The depth information can be used for ranging, for generating a depth image or for three-dimensional modeling, etc. In some embodiments, the laser device 100 and the receiving device 200 may be fixed on the same circuit board. The circuit board may be a rigid circuit board, a flexible circuit board or a rigid-flex circuit board. In this embodiment, since the illuminance at the center of the refracted beam 1 is less than that at the edge, after the refracted beam 1 is reflected by the target object 300, due to diffuse reflection, a reflected beam 2 with uniform illuminance can be formed, that is, a reflected beam 2 with uniform energy is obtained. Therefore, when the receiving device 200 collects the reflected beam 2, the ranging effect can be improved.

[0064] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module. The TOF (Time Of Flight) camera module can be used in portable electronic devices, such as smart phones, tablet computers, portable computers or other portable electronic devices.

[0065] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module. The TOF (Time Of Flight) camera module can be assembled in an electronic device to change the interaction mode between the electronic device and people. For example, functions such as gesture control and iris unlocking.

[0066] As Figure 7As shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and this TOF (Time Of Flight) camera module is applied to video image acquisition instruments such as cameras and camcorders. Thus, in the subsequent video image processing, through simple post-processing, special effect props can be inserted into any position in the video image. In this way, on the one hand, the realism of the special effects can be enhanced, and on the other hand, shooting is no longer restricted by the shooting location, greatly reducing the production cost.

[0067] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and this TOF (Time Of Flight) camera module can be configured in household devices such as air conditioners, refrigerators, and televisions to change the interaction mode between the user and the household device, such as realizing functions like gesture control of household devices.

[0068] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and this TOF (Time Of Flight) camera module can be assembled in a robot device to provide the robot device with three-dimensional vision capabilities. Thus, the robot device can realize functions such as spatial positioning, path planning, obstacle avoidance, and gesture control, so that the robot device can better serve humans, where the robots include entertainment and leisure robots, medical robots, domestic robots, and field robots, etc.

[0069] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and this TOF (Time Of Flight) camera module can be assembled in a security monitoring device such as a surveillance device to improve the accuracy of the analysis of the security monitoring device and increase intelligent applications such as behavior analysis.

[0070] As Figure 7 shown, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and this TOF (Time Of Flight) camera module can be assembled in an Internet of Things terminal device to collect the depth information of other terminal devices through the TOF camera module, so as to enhance the accuracy and comprehensiveness of communication between different terminals in the Internet of Things network. In other words, based on the TOF camera module, the interaction mode between things can be further changed, rather than just the human-machine interaction mode.

[0071] AsFigure 7 As shown in the figure, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and the TOF (Time Of Flight) camera module can be applied to an unmanned device, such as an unmanned vehicle, a drone, an unmanned ship, etc. The TOF camera module provides a three-dimensional vision basis for the unmanned device to provide technical support for unmanned driving.

[0072] As Figure 7 shown in the figure, in this embodiment, the electronic device 10 is, for example, a TOF (Time Of Flight) camera module, and the TOF (Time Of Flight) camera module can be assembled in a medical device, such as an endoscope, a colonoscope, etc., so that the medical device can perform three-dimensional observation on human organs to obtain more comprehensive information about human organs.

[0073] In summary, the present invention proposes a laser device and an electronic device. In the present invention, a laser is disposed on a substrate, and then an optical element is disposed above the laser. A microlens array is disposed on a surface of the optical element close to the laser, and a surface of the optical element far from the laser is a plane. Then, a plano-convex lens is disposed on this plane. Therefore, when the laser beam emitted by the laser irradiates on the optical element, the optical element can play a role in uniformizing the light. Then, the laser beam irradiates on the target object after passing through the plano-convex lens. Since the plano-convex lens can adjust the energy distribution of the laser beam, when the laser beam irradiates on the target object, a refracted beam (refracted light spot) with a central illuminance less than the edge illuminance can be formed. The refracted beam can also have a larger sideslope. After the refracted beam is reflected by the object, a reflected beam with uniform illuminance is formed, that is, a reflected beam with uniform energy is obtained. Therefore, when the receiving device receives this reflected beam, the energy loss outside the field of view angle can be smaller, thereby improving the ranging effect.

[0074] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, a technical solution formed by mutually replacing the above features with (but not limited to) technical features with similar functions disclosed in the present application.

[0075] Except for the technical features described in the specification, the remaining technical features are known to those skilled in the art. To highlight the innovative features of the present invention, the remaining technical features are not described herein again.

Claims

1. A laser device, characterized in that, it comprises: a substrate; a bracket, arranged on the substrate; a laser, arranged on the substrate and located inside the bracket; an optical element, arranged on the bracket, and the optical element includes a first surface and a second surface arranged opposite to each other; an adhesive layer, arranged on the second surface; a plano-convex lens, arranged on the adhesive layer; wherein, the first surface faces the laser, and a microlens array is arranged on the first surface, and the ratio of the radius of curvature to the aperture of the microlenses in the microlens array is less than 0.5; wherein, the laser beam emitted by the laser sequentially passes through the optical element and the plano-convex lens and exits, forming a refracted beam; wherein, the ratio of the radius of curvature to the aperture of the microlens is A, and the ratio of the radius of curvature to the aperture of the plano-convex lens is 25A - 75A, and at the same time, the ratio of the aperture of the plano-convex lens to the aperture of the microlens is greater than 20; wherein, the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam.

2. The laser device according to claim 1, characterized in that, the microlenses in the microlens array are rotationally symmetric aspherical surfaces, and the function of the cross-section of the microlens is: wherein, c represents the radius of curvature of the microlens, and k represents the conic constant of the microlens.

3. The laser device according to claim 2, characterized in that, the conic constant is -1.5 to -0.

5.

4. The laser device according to claim 1, characterized in that, the central thickness of the plano-convex lens is 0.5 to 1.5 millimeters.

5. The laser device according to claim 1, characterized in that, the conic constant of the plano-convex lens is -1.5 to -0.

5.

6. The laser device according to claim 1, characterized in that, the radius of curvature of the plano-convex lens is -10 to -30 millimeters.

7. The laser device according to claim 1, characterized in that, the thickness of the adhesive layer is 100 - 200 microns.

8. The laser device according to claim 1, characterized in that, the angle at the center of the refracted beam is -20° to 20°.

9. The laser device according to claim 1, characterized in that, the angles at the edge of the refracted beam are 20° to 60° and -20° to -60°.

10. An electronic device, characterized in that, it comprises: a laser device for emitting a laser beam, and the laser beam forms a reflected beam when irradiated on an object; a receiving device for receiving the reflected beam; wherein, the laser device includes: a substrate; a bracket, arranged on the substrate; a laser, arranged on the substrate and located inside the bracket; an optical element, arranged on the bracket, and the optical element includes a first surface and a second surface arranged opposite to each other; an adhesive layer, arranged on the second surface; a plano-convex lens, arranged on the adhesive layer; wherein, the first surface faces the laser, and a microlens array is arranged on the first surface, and the ratio of the radius of curvature to the aperture of the microlenses in the microlens array is less than 0.5; Wherein, the laser beam emitted by the laser passes through the optical element and the plano-convex lens in sequence and exits, forming a refracted beam, and the refracted beam forms the reflected beam after being reflected by the object; Wherein, the ratio of the radius of curvature to the aperture of the microlens is A, the ratio of the radius of curvature to the aperture of the plano-convex lens is 25A - 75A, and at the same time, the ratio of the aperture of the plano-convex lens to the aperture of the microlens is greater than 20; Wherein, the illuminance at the center of the refracted beam is less than the illuminance at the edge of the refracted beam.

Images