Optical radar device, light source structure and assembling method thereof

Abstract

The invention provides an optical radar device, a light source structure and an assembling method thereof. The light source structure comprises a light source module, a circuit board, a packaging piece and a light beam adjusting module. The light source module comprises a base material and at least one light source assembly, the at least one light source assembly is formed on a bearing face of the base material, each light source assembly is provided with a plurality of light-emitting units, and each light-emitting unit is provided with a light emitting part. The light source module is arranged on the circuit board, the packaging piece is arranged on the circuit board and surrounds the light source module, the packaging piece is provided with a light-transmitting part, and the light-emitting part of the light-emitting unit faces the light-transmitting part. The light beam adjusting module is arranged on the light-transmitting part of the packaging piece, and light emitted by the light-emitting part of the light-emitting unit passes through the light-transmitting part and the light beam adjusting module to form a working light beam.

Description

Technical Field

[0001] The present invention relates to the technical field of a laser ranging device, and in particular to a light source structure that forms a light source array including a plurality of light source components on a substrate and forms a packaging structure with the entire light source array, a lidar device configured with this light source structure, and an assembly method of the light source structure. Background Art

[0002] The lidar device is a technology that uses pulsed laser light to measure the distance to an object. After the laser beam is emitted, it is reflected from the surface of the target, and the reflected laser beam can be received to obtain the distance to the target by means of ranging technologies (such as ToF technology or FMCW technology). The lidar device is widely used in meteorology, terrain detection, or the currently popular ranging applications for autonomous vehicle driving.

[0003] The light source structure of the existing lidar device uses laser diodes. A plurality of laser diodes are mounted on a circuit board to form an array, and the laser diode array emits laser beams at a predetermined frequency as the light source for ranging. However, in this existing laser light source structure, since each laser diode is individually soldered to the circuit board, subsequent alignment and correction processes for the laser diode array need to be performed to ensure that the irradiation direction of the light beam of the light source can meet the requirements. In addition, the light emission direction of the existing laser diode array is parallel to the circuit board, so a prism needs to be additionally provided to deflect the light. Thus, the manufacturing process of the existing lidar device is relatively complex and the light beam irradiation direction is easily affected by the manufacturing process. In addition, the existing lidar device has a large number of components and is not easily miniaturized. Summary of the Invention

[0004] In view of this, an object of the present invention is to provide a lidar device, a light source structure, and an assembly method thereof, which can achieve the required accuracy of the light output of the light source structure with a relatively simple process.

[0005] An embodiment of the light source structure of the present invention includes a light source structure, which includes:

[0006] A light source module, which includes a substrate and at least one light source component. The at least one light source component is formed on a bearing surface of the substrate, and each light source component has a plurality of light emitting units, and each of the light emitting units has a light emitting portion;

[0007] A circuit board, on which the light source module is disposed;

[0008] A package, which is disposed on the circuit board and surrounds the light source module. The package is integrally formed and has a light transmissive portion, and the light emitting portions of these light emitting units face the light transmissive portion; and

[0009] A beam adjustment module is disposed at the light-transmitting portion of the package, and the light emitted from the light-emitting portions of the light-emitting units forms a working beam through the light-transmitting portion and the beam adjustment module.

[0010] In an embodiment, each of the light-emitting units controls light emission individually, and the light emitted from the light-emitting portion is directed towards a light-emitting direction. The bearing surface of the substrate is perpendicular to the circuit board, and the light-emitting direction is away from and perpendicular to the circuit board.

[0011] The light-transmitting portion of the package is a planar lens.

[0012] In an embodiment, the light source module includes a plurality of light source components, and these light source components are arranged to form a light source array. Each of the light source components has the same number or different numbers of the light-emitting units; wherein the light-emitting units are semiconductor light-emitting units.

[0013] In an embodiment, the number of the light-emitting units of each of the light source components is less than or equal to eight, and the light-emitting units are laser diode chips or vertical cavity surface emitting lasers.

[0014] In an embodiment, the number of the light-emitting units of each of the light source components is four. The light source module further includes a first electrode layer and a second electrode layer. The first electrode layer and the second electrode layer are disposed on the bearing surface of the substrate, and the first electrode layer and the second electrode layer are electrically connected to the circuit board. The first electrode layer is close to the first side of the light source array, the second electrode layer is close to the second side and the third side of the light source array. The second side is opposite to the third side, the first side is adjacent to the second side and the third side, and the light-emitting portions of the light-emitting units are located on the fourth side of the light source array, and the fourth side is opposite to the first side.

[0015] In an embodiment, the beam adjustment module includes a fast-axis collimating mirror, and the fast-axis collimating mirror is adjacent to the light-transmitting portion of the package. The light emitted from the light-emitting portions of the light-emitting units sequentially passes through the light-transmitting portion and the fast-axis collimating mirror.

[0016] The beam adjustment module further includes a slow-axis collimating mirror. The slow-axis collimating mirror is connected to the fast-axis collimating mirror and forms an integrated structure with the fast-axis collimating mirror. The light passing through the fast-axis collimating mirror sequentially passes through the slow-axis collimating mirror.

[0017] The fast-axis collimating mirror includes a convex lens portion and a first cylindrical portion connected to the convex lens portion. The slow-axis collimating mirror includes a concave lens portion and a second cylindrical portion connected to the concave lens portion. The first cylindrical portion is connected to the second cylindrical portion.

[0018] The light sequentially passes through the convex lens portion, the first columnar portion, the second columnar portion, and the concave lens portion. The convex lens portion deflects the light in a first direction, and the concave lens portion deflects the light in a second direction perpendicular to the first direction.

[0019] In one embodiment, the beam adjustment module includes a slow axis collimator that faces the light-transmitting portion of the package. The light emitted from the light-emitting portions of the light-emitting units sequentially passes through the light-transmitting portion and the slow axis collimator. The base material has electrical insulation and thermal conductivity, and the heat generated when the light-emitting units operate is dissipated by conduction through the base material.

[0020] In one embodiment, the light-emitting portion of each light-emitting unit has a horizontal width dx, a vertical width dy, a horizontal emission angle θx, and a vertical emission angle θy. The horizontal width dx is the width parallel to the bearing surface, and the vertical width dy is the width perpendicular to the bearing surface. The range of the horizontal width is 200 μm ≤ dx ≤ 400 μm, the range of the vertical width is 0.5 μm ≤ dy ≤ 15 μm, the range of the horizontal emission angle is 8° ≤ θx ≤ 15°, the range of the vertical emission angle is 20° ≤ θy ≤ 40°, 2 ≤ θy / θx ≤ 4, and the ratio of the distance between two adjacent light-emitting portions to the distance between the centers of two adjacent light-emitting portions is 20% to 40%.

[0021] The range of the horizontal width dx is 348.25 μm ≤ dx ≤ 351.75 μm, the range of the vertical width dy is 0.995 μm ≤ dy ≤ 1.005 μm, the range of the horizontal emission angle θx is 9.95° ≤ θx ≤ 10.05°, the range of the vertical emission angle θy is 32.835° ≤ θy ≤ 33.165°, the range of the distance between the centers of two adjacent light-emitting portions in the horizontal direction is greater than or equal to 497.75 μm and less than or equal to 502.5 μm, and the range of the distance between two adjacent light-emitting portions is greater than or equal to 149.25 μm and less than or equal to 150.75 μm.

[0022] The present invention also provides a lidar device, including:

[0023] A housing having a transparent window;

[0024] The above-described light source structure disposed within the housing;

[0025] A scanner having a plurality of reflecting mirrors, the scanner rotating about an axis;

[0026] A light receiver disposed within the housing and aligned with the window; and

[0027] A calculation and control unit, electrically connected to the light source structure, the scanner, and the light receiver;

[0028] Wherein the light source structure emits the working light beam, the scanner rotates so that one of the reflecting mirrors reflects the working light beam and emits it to the outside through the window, and the emission angle of the working light beam changes with time. The working light beam is reflected by an external object and received by the light receiver, and the calculation and control unit calculates the distance of the object according to the emission and reception states of the working light beam.

[0029] The present invention also provides an assembly method for a light source structure, including:

[0030] Substrate providing step: providing a substrate, the substrate having a bearing surface;

[0031] Light source module forming step: forming at least one light source component on the bearing surface, so that the light source component and the substrate constitute a light source module. Each light source component has a plurality of light emitting units, and each light emitting unit has a light emitting portion;

[0032] Circuit board providing step: providing a circuit board;

[0033] Light source module assembling step: setting the light source module on the circuit board;

[0034] Package providing step: providing a package, the package having a light transmissive portion;

[0035] Package assembling step:

[0036] Setting the package on the circuit board and forming an accommodating space, setting the light source module in the accommodating space, and the light emitting portions of these light emitting components corresponding to the light transmissive portion;

[0037] Making the accommodating space in a vacuum state;

[0038] Beam adjustment module providing step: providing a beam adjustment module; and

[0039] Beam adjustment module assembling step: setting the beam adjustment module corresponding to the light transmissive portion, so that the light emitted from the light emitting portions of these light emitting units passes through the beam adjustment module to form a working light beam.

[0040] In an embodiment, the light source module forming step further includes:

[0041] Setting these light emitting units to form individual controlled light emission;

[0042] Setting the light emission of these light emitting portions to be in the same light emission direction;

[0043] Forming a plurality of light source components on the bearing surface; and

[0044] Arrange these light source components in an array;

[0045] The assembling steps of the light source module further include:

[0046] Set the light source module on the circuit board with the bearing surface of the base material perpendicular to the circuit board;

[0047] The beam adjustment module further includes a slow-axis collimating mirror, and the assembling steps of the beam adjustment module further include:

[0048] Make the slow-axis collimating mirror adjacent to the light-transmitting part of the package.

[0049] Wherein, the number of the light-emitting units of each light source component is less than or equal to eight, and the number of the light-emitting units of each light source component is four.

[0050] In an embodiment, the beam adjustment module includes a fast-axis collimating mirror, and the assembling steps of the beam adjustment module further include:

[0051] Make the fast-axis collimating mirror adjacent to the light-transmitting part of the package;

[0052] The beam adjustment module further includes a slow-axis collimating mirror and the slow-axis collimating mirror is integrally formed with the fast-axis collimating mirror. The fast-axis collimating mirror includes a convex lens part and a first columnar part connected to the convex lens part. The slow-axis collimating mirror includes a concave lens part and a second columnar part connected to the concave lens part. The first columnar part is connected to the second columnar part and forms an integral structure. The assembling steps of the beam adjustment module further include:

[0053] Make the first columnar part adjacent to the light-transmitting part of the package.

[0054] In the assembling method of the light source structure of the present invention, since a light source component is formed by a plurality of light-emitting units, a plurality of light source components form a light source array, the entire light source array is encapsulated by a package, and each light-emitting unit controls light emission individually, thus the accuracy of the light beam emission of the light source array can be increased, the subsequent beam projection calibration process can be simplified, and it is not necessary to weld a plurality of laser diodes on the circuit board as in the prior art, so the assembling process can be simplified and the required accuracy can be easily achieved.

[0055] In addition, the light-emitting direction of the light-emitting part of the light-emitting unit is perpendicular to the circuit board, and it is not necessary to provide a prism for turning the light beam, so the number of components of the light source structure can be reduced.

[0056] The fast-axis collimating mirror and the slow-axis collimating mirror of the beam adjustment module form an integrated structure, which can achieve the required accuracy of the light output of the light source structure with relatively simple processes, and can reduce the number of components, facilitating the miniaturization of the lidar device. There is no need for individual settings of the fast-axis collimating mirror and the slow-axis collimating mirror as in the prior art, so there is no need for the processes of adjustment and calibration during the assembly of the fast-axis collimating mirror and the slow-axis collimating mirror. Brief Description of the Drawings

[0057] Figure 1 It is a perspective view of the light source module of the light source structure of the present invention.

[0058] Figure 2 is Figure 1 a perspective view of the light source array of the light source module of

[0059] Figure 3 and Figure 4 It is a perspective view of the package of the light source structure of the present invention disposed on the circuit board and covering the light source module.

[0060] Figure 5 It is a top view of the beam adjustment module of the light source structure of the present invention disposed in the light-transmitting portion of the package.

[0061] Figure 6 is Figure 5 a side view of

[0062] Figure 7 It is a perspective view of an embodiment of the lidar device of the present invention.

[0063] Figure 8 It is a flowchart of an embodiment of the assembly method of the light source structure of the present invention.

[0064] Figure 9 It is a perspective view of the light source module after the assembly method of the light source structure of the present invention is completed. Detailed Description of the Invention

[0065] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , which shows an embodiment of the light source structure of the present invention. The light source structure 1 of this embodiment includes a light source module 10, a circuit board 20, a package 30, and a beam adjustment module 40.

[0066] As Figure 1As shown, the light source module 10 includes a substrate 11, a plurality of light source components 12, a first electrode layer 13, and a second electrode layer 14. The substrate 11 has a bearing surface 111, and the plurality of light source components 12, the first electrode layer 13, and the second electrode layer 14 are formed on the bearing surface 111 of the substrate 11, for example, by chemical vapor deposition (CVD) on the bearing surface 111 of the substrate 11. The substrate 11 in this embodiment can be a substrate of aluminum nitride (AlN). The aluminum nitride substrate has good electrical insulation and good heat conductivity. Therefore, the aluminum nitride substrate can provide a good electrical insulation structure for the light source components 12, the first electrode layer 13, and the second electrode layer 14, and the heat generated when the light source components 12 operate can also be transferred to the outside by heat conduction of the aluminum nitride substrate for heat dissipation. The light source module 10 in this embodiment is a laser module, and the light source component 12 is a laser diode component.

[0067] The plurality of light source components 12 are arranged in a light source array A. Each light source component 12 has a plurality of light emitting units 121 (as Figure 5 shown). The light emitting unit 121 in this embodiment is a semiconductor light emitting component, and further can be a laser diode die or a vertical cavity surface emitting laser (VCSEL). Each light source component 12 in this embodiment having four light emitting units 121 can obtain the best yield, and the number of light emitting units 121 of each light source component 12 is greater than or equal to two and less than or equal to eight. Each light source component 12 in the light source array A can have the same number of light emitting units 121 or different numbers of light emitting units 121. For example, each light source component 12 has four light emitting units 121, or some light source components 12 have two light emitting units 121, some light source components 12 have three light emitting units 121, and some light source components 12 have four light emitting units 121.

[0068] As Figure 2 shown, the light source array A has a first side A1, a second side A2, a third side A3, and a fourth side A4. The first side A1 and the fourth side A4 are oppositely arranged, the second side A2 and the third side A3 are oppositely arranged, the first side A1 is adjacent to the second side A2 and the third side A3, and the fourth side A4 is also adjacent to the second side A2 and the third side A3. The first electrode layer 13 is close to the first side A1 of the light source array A, and the second electrode layer 14 is close to the second side A2 and the third side A3 of the light source array A. The first electrode layer 13 and the second electrode layer 14 are electrically insulated from each other.

[0069] Each light-emitting unit 121 has a P-type semiconductor, an N-type semiconductor, and a light-emitting layer (active layer) disposed between the P-type semiconductor and the N-type semiconductor. The N-type semiconductor is electrically connected to the first electrode layer 13, and the P-type semiconductor is electrically connected to the second electrode layer 14. The light-emitting layer forms a light-emitting portion 1211 at the fourth side A4 of the light source array A. The light-emitting portions 1211 of all the light-emitting units 121 face a light-emitting direction L. The light generated after electrons and holes are combined in the light-emitting layer is emitted from the light-emitting portion 1211 along the light-emitting direction L. The N-type semiconductor of each light-emitting unit 121 is connected to the first electrode layer 13 by two pins. One pin provides current, and the other pin controls whether the light-emitting layer emits light. Thus, each light-emitting unit 121 can be individually controlled to emit light.

[0070] As Figure 3 and Figure 4 shown, the light source module 10 is disposed on the circuit board 20. The first electrode layer 13 and the second electrode layer 14 of the light source module 10 are electrically connected to the circuits on the circuit board 20. Thus, the circuits on the circuit board 20 can provide current to the light source module 10 and control the light emission of the light source module 10. The bearing surface 111 of the base material 11 of the light source module 10 is perpendicular to the circuit board 20. The first side A1 of the light source array A is disposed close to the circuit board 20, and the fourth side A4 of the light source array A is away from the circuit board 20. Thus, the light-emitting direction L of the light emitted from the light-emitting portion 1211 of the light-emitting unit 121 is perpendicular to the circuit board 20, and thus there is no need to provide a prism for deflecting the light path.

[0071] The package 30 is disposed on the circuit board 20 and surrounds the light source module 10. The package 30 of this embodiment is integrally formed and has a light-transmitting portion 31 and a peripheral wall 32. The peripheral wall 32 surrounds the light source module 10. The light-transmitting portion 31 is disposed at one end of the peripheral wall 32 and corresponds to the light-emitting portion 1211 of the light-emitting unit 121 of the light source module 10. The light-emitting direction L of the light-emitting portion 1211 of the light-emitting unit 121 extends through the light-transmitting portion 31. The light-transmitting portion 31 of this embodiment is a plane lens, for example, it can be a plane lens with double-sided coating to avoid light reflection.

[0072] As Figure 5 and Figure 6As shown, the beam adjustment module 40 is disposed close to the light-transmitting portion 31 of the package 30. The light emitted from the light-emitting portion 1211 of the light-emitting unit 121 forms a working beam through the beam adjustment module 40. The beam adjustment module 40 of the present embodiment includes a fast axis collimator 41 and a slow axis collimator 42. The fast axis collimator 41 can converge and converge the light emitted by the light source module 10 at a large angle before divergence. The slow axis collimator 42 adjusts the light pattern of the light converged by the fast axis collimator 41 to meet the application requirements. The slow axis collimator 42 of the present embodiment is connected to the fast axis collimator 41, that is, the fast axis collimator 41 and the slow axis collimator 42 form an integrated structure. In this way, the adjustment and calibration between the fast axis collimator 41 and the slow axis collimator 42 can be completed during the manufacture of the beam adjustment module 40, which can simplify the subsequent adjustment and calibration processes. The above description is one of the preferred embodiments of the beam adjustment module 40, but not limited thereto, and it should be understood that the same effect of this case can also be achieved when only the fast axis collimator 41 or the slow axis collimator 42 is provided, which can also be regarded as one of the embodiments; when only the fast axis collimator 41 is provided, although the light pattern of the beam cannot be adjusted (for example, increasing the divergence angle of the beam to cover a larger target area range), it can be known that the longer the beam moving distance, the larger the area of the light spot will be, and it can also cover a larger target area range; when only the slow axis collimator 42 is provided, although the beam received by it is not converged, if the distance between the slow axis collimator 42 and the exit surface is closer, there will also be a chance that the light emitted by the light source module 10 enters the slow axis collimator 42 before divergence, thus achieving the effect of this case.

[0073] The fast axis collimator 41 of the present embodiment includes a columnar convex lens, which can be an aspherical columnar convex lens, such as a parabolic columnar convex lens; the slow axis collimator 42 includes a columnar concave lens, which has a microstructure formed by arranging a plurality of aspherical (such as parabolic) concave lenses in an array. In other embodiments, the fast axis collimator 41 can also be a spherical convex lens, and the slow axis collimator 42 can also be a spherical concave lens.

[0074] In this embodiment, the fast-axis collimating mirror 41 and the slow-axis collimating mirror 42 are combined to form an integrated structure of the beam adjustment module 40. The fast-axis collimating mirror 41 includes a convex lens portion 411 and a first columnar portion 412, and the slow-axis collimating mirror 42 includes a concave lens portion 421 and a second columnar portion 422. The concave lens portion 421 has a microstructure of a plurality of concave lenses. The convex lens portion 411 and the concave lens portion 421 are respectively disposed on opposite sides of the integrated beam adjustment module 40. The first columnar portion 412 and the second columnar portion 422 are connected to each other. The convex lens portion 411 of the fast-axis collimating mirror 41 faces the light-transmitting portion 31 of the package 30. After the light passes through the light-transmitting portion 31 from the light source module 10 and then passes through the convex lens portion 411 of the fast-axis collimating mirror 41, the diverging light is converged by the convex lens portion 411 in the fast axis direction (the first direction L1) of the beam. Then the light passes through the first columnar portion 412 and the second columnar portion 422 without refractive power, and finally the light passes through the concave lens portion 421. The concave lens portion 421 causes the light to diverge to an appropriate extent in the second direction L2, and the second direction L2 is perpendicular to the first direction L1.

[0075] Please refer to Figure 7 , which shows an embodiment of the lidar device of the present invention. The lidar device Li of this embodiment includes a light source structure 1, a housing 2, a scanning member 3, a light receiving member 4, and a calculation and control unit (not shown). The housing 2 is a hollow rectangular parallelepiped structure. The light source structure 1, the scanning member 3, and the light receiving member 4 are all disposed inside the housing 2. The calculation and control unit may be a calculator device disposed outside the housing 2. The housing 2 has a transparent window 2A on the side wall for the working beam generated by the light source structure 1 to be emitted to the outside and for the beam reflected by the object to return to the lidar device Li.

[0076] The scanned part 3 has multiple reflecting mirrors 3A, and the multiple reflecting mirrors 3A are connected to each other to form a columnar structure. The scanned part 3 can rotate around an axis. The light source structure 1 emits a working light beam at a predetermined frequency. The scanned part 3 rotates so that one of the reflecting mirrors 3A reflects the working light beam and then emits it to the outside through the window 2A, and the emission angle of the working light beam changes with time, thereby generating a scanning effect within a certain angular range with respect to the horizontal direction (X-axis) of the lidar device. Since the concave lens portion 421 of the beam adjustment module 40 causes the light to diverge to an appropriate extent in the second direction L2, the divergence angle can be, but is not limited to, 32 degrees or 60 degrees. The second direction L2 is parallel to the vertical direction (Y-axis) of the lidar device. In this way, when the scanned part 3 rotates, the light can be scanned in the X-axis and Y-axis directions of the external space. Since the working light beam travels along the Z-axis, a three-dimensional scanning effect can be generated. Since the multiple reflecting mirrors 3A are connected to each other to form a columnar structure, when the scanned part 3 rotates around the axis, the reflection of the working light beam by the reflecting mirror 3A will produce a periodic cycle, enabling the working light beam to generate a periodic scanning effect within a certain angular range.

[0077] The light receiving part 4 is arranged in the housing 2 and aligned with the window 2A. The working light beam is reflected by an external object and then received by the light receiving part 4. The calculation and control unit is electrically connected to the light source structure 1, the scanned part 3, and the light receiving part 4. The calculation and control unit calculates the distance of the object based on the emission and reception states of the working light beam.

[0078] For the lidar device and its light source structure of the present invention, since a light source assembly is formed by multiple light emitting units, multiple light source assemblies form a light source array, and the entire light source array is encapsulated by a packaging component, and each light emitting unit is individually controlled to emit light, the accuracy of the light beam emission of the light source array can be increased, the subsequent light beam projection calibration process can be simplified, and it is not necessary to weld multiple laser diodes to a circuit board as in the prior art, which can simplify the assembly process and easily achieve the required accuracy.

[0079] In addition, the light emitting direction of the light emitting part of the light emitting unit is perpendicular to the circuit board, and the slow axis collimating mirror of the beam adjustment module is used to deflect the light in the Y-axis direction and the scanned part is used to deflect and scan the light in the X-axis direction. Therefore, it is not necessary to provide a prism for deflecting the light beam, which can reduce the number of components of the light source structure.

[0080] Please refer to Figure 8 , which shows an embodiment of the assembly method of the light source structure of the present invention. The assembly method of the light source structure in this embodiment is to assemble the light source structure for a lidar device, but the light source structure of the present invention is not limited to a lidar device and can also be applied to other laser ranging devices.

[0081] Please refer to together Figure 8 、Figure 9 Step S1 is the substrate providing step. In step S1, a substrate 11 is provided, and the substrate 11 has a bearing surface 111. The substrate 11 in this embodiment may be a substrate of aluminum nitride (AlN), and the aluminum nitride substrate has good electrical insulation and good heat conductivity. Then it proceeds to step S2.

[0082] Step S2 is the light source module forming step. In step S2, at least one light source component 12 is formed on the bearing surface 111, so that the light source component 12 and the substrate 11 constitute a light source module 10. Each light source component 12 has a plurality of light emitting units 121, and each light emitting unit 121 has a light emitting portion 1211. Each light emitting portion 1211 in this embodiment has a horizontal width dx, a vertical width dy, a horizontal light emitting angle θx, and a vertical light emitting angle θy. The horizontal width dx is the width parallel to the bearing surface, and the vertical width dy is the width perpendicular to the bearing surface. The range of the horizontal width is 200 μm ≤ dx ≤ 400 μm, and the horizontal width dx is preferably 350 μm. In the case where the measurement tolerance is ±0.5%, the range of the preferred horizontal width dx is 348.25 μm ≤ dx ≤ 351.75 μm. The range of the vertical width is 0.5 μm ≤ dy ≤ 15 μm, and the vertical width is preferably 1 μm. In the case where the measurement tolerance is ±0.5%, the range of the preferred vertical width dy is 0.995 μm ≤ dy ≤ 1.005 μm. The range of the horizontal light emitting angle is 8° ≤ θx ≤ 15°, and the horizontal light emitting angle θx is preferably 10°. In the case where the measurement tolerance is ±0.5%, the range of the horizontal light emitting angle θx is 9.95° ≤ θx ≤ 10.05°. The range of the vertical light emitting angle is 20° ≤ θy ≤ 40°, and the vertical light emitting angle θy is preferably 33°. In the case where the measurement tolerance is ±0.5%, the range of the vertical light emitting angle θy is 32.835° ≤ θy ≤ 33.165°. Then it proceeds to step S3.

[0083] In order to enable the light source component 12 to operate, the light source module 10 further includes a first electrode layer 13 and a second electrode layer 14. The light source module forming step further includes forming the first electrode layer 13 and the second electrode layer 14 on the bearing surface 111 of the substrate 11, for example, by chemical vapor deposition (CVD) on the bearing surface 111 of the substrate 11.

[0084] The light source module forming step of step S2 further includes: forming a plurality of light source components 12 on the bearing surface 111 and arranging the plurality of light source components 12 in an array A. Each light source component 12 has a plurality of light emitting units 121 (such as Figure 5As shown in the figure, the light-emitting unit 121 of this embodiment is a laser diode die. When the above-mentioned horizontal light-emitting angle θx and vertical light-emitting angle θy satisfy the conditional formula 4 ≧ θy / θx ≧ 2, the utilization rate of laser energy is relatively high. Each light source module 12 of this embodiment has four light-emitting units 121 to obtain the best yield. The number of light-emitting units 121 of each light source module 12 is greater than or equal to two and less than or equal to eight. Each light source module 12 of the light source array A may have the same number of light-emitting units 121 or different numbers of light-emitting units 121. For example, each light source module 12 has four light-emitting units 121, or some light source modules 12 have two light-emitting units 121, some light source modules 12 have three light-emitting units 121, and some light source modules 12 have four light-emitting units 121. The distance D between the horizontal centers of two adjacent light-emitting parts 1211 in the same light source module 12 is 500 microns. Under the measurement tolerance of ±0.5%, the range of the distance between the horizontal centers of two adjacent light-emitting parts 1211 is greater than or equal to 497.5 microns and less than or equal to 502.5 microns. The spacing between two adjacent light-emitting parts 1211 is 150 microns. Under the measurement tolerance of ±0.5%, the range of the spacing between two adjacent light-emitting parts 1211 is greater than or equal to 149.25 microns and less than or equal to 150.75 microns. To prevent two adjacent light-emitting parts 1211 from being too close to each other and interfering with each other, and also affecting the size of the subsequent beam adjustment module 40 (please refer to the description in the following paragraphs), the preferred ratio of the spacing between two adjacent light-emitting parts 1211 to the distance between the horizontal centers of two adjacent light-emitting parts 1211 is about 20% to 40%.

[0085] As Figure 2 As shown in the figure, the light source array A has a first side A1, a second side A2, a third side A3, and a fourth side A4. The first side A1 and the fourth side A4 are oppositely arranged. The second side A2 and the third side A3 are oppositely arranged. The first side A1 is adjacent to the second side A2 and the third side A3. The fourth side A4 is also adjacent to the second side A2 and the third side A3. The first electrode layer 13 is close to the first side A1 of the light source array A. The second electrode layer 14 is close to the second side A2 and the third side A3 of the light source array A. The first electrode layer 13 and the second electrode layer 14 are electrically insulated from each other.

[0086] Each light-emitting unit 121 has a P-type semiconductor, an N-type semiconductor, and a light-emitting layer (active layer) disposed between the P-type semiconductor and the N-type semiconductor. The N-type semiconductor is electrically connected to the first electrode layer 13, and the P-type semiconductor is electrically connected to the second electrode layer 14. The light-emitting layer forms a light-emitting part 1211 at the fourth side A4 of the light source array A.

[0087] The light source module forming step of step S2 further includes: setting the light-emitting portions 1211 of all the light-emitting units 121 to face a light-emitting direction L. Therefore, the light generated after electrons and holes are combined in the light-emitting layer emits from the light-emitting portion 1211 along the light-emitting direction L.

[0088] The light source module forming step of step S2 further includes: setting the light-emitting units 121 to form individual light emission control. The N-type semiconductors of each light-emitting unit 121 are connected to the first electrode layer 13 by two pins. One pin provides current, and the other pin controls whether the light-emitting layer emits light. Thus, each light-emitting unit 121 can control light emission individually.

[0089] Step S3 is the circuit board providing step: providing a circuit board 20. The circuit board 20 can be a rigid circuit board composed of epoxy resin and glass fiber or a flexible circuit board composed of polyimide (PI). Then, step S4 is entered.

[0090] Step S4 is the light source module assembling step. In step S4, the light source module 10 is disposed on the circuit board 20. The first electrode layer 13 and the second electrode layer 14 of the light source module 10 are electrically connected to the circuits on the circuit board 20. Thus, the circuits on the circuit board 20 can provide current to the light source module 10 and control the light emission of the light source module 10. The bearing surface 111 of the base material 11 of the light source module 10 is perpendicular to the circuit board 20. The first side A1 of the light source array A is disposed close to the circuit board 20, and the fourth side A4 of the light source array A is away from the circuit board 20. In this way, the light-emitting direction L of the light emitted from the light-emitting portion 1211 of the light-emitting unit 121 is perpendicular to the circuit board 20, and thus a prism for deflecting the light path does not need to be provided. Then, step S5 is entered.

[0091] Step S5 is the encapsulation providing step. In step S5, an encapsulation 30 is provided. The encapsulation 30 has a light-transmitting portion 31. The encapsulation 30 of this embodiment has a light-transmitting portion 31 and a peripheral wall 32. The light-transmitting portion 31 of this embodiment is a planar lens. For example, it can be a planar lens with double-sided coating to avoid light reflection. Then, step S6 is entered.

[0092] Step S6 is the encapsulation assembling step. In step S6, the encapsulation 30 is disposed on the circuit board 20 and a receiving space S is formed. The light source module 10 is located in the receiving space S, and the light-emitting portions 1211 of the light-emitting units 121 of the light-emitting assembly 12 correspond to the light-transmitting portion 31. The peripheral wall 32 of the encapsulation 30 surrounds the light source module 10. The light-transmitting portion 31 is disposed at one end of the peripheral wall 32 and corresponds to the light-emitting portions 1211 of the light-emitting units 121 of the light source module 10. The light-emitting direction L of the light-emitting portions 1211 of the light-emitting units 121 extends through the light-transmitting portion 31. The receiving space S is made to be in a vacuum state. Then, step S7 is entered.

[0093] Step S7 is a step of providing a beam adjustment module. In step S7, the beam adjustment module 40 is provided. Then, it proceeds to step S8.

[0094] Step S8 is a step of assembling the beam adjustment module. In step S8, the beam adjustment module 40 is disposed corresponding to the light transmissive portion 31 such that the light emitted from the light emitting portion 1211 of the light emitting unit 121 passes through the beam adjustment module 40 to form a working beam. The step of assembling the beam adjustment module further includes: bringing the fast axis collimating mirror 41 into contact with the light transmissive portion 31 of the package 30. Specifically, the first columnar portion 412 of the fast axis collimating mirror 41 is brought into contact with the light transmissive portion 31 of the package 30.

[0095] In the assembling method of the light source structure of the present invention, since a light source assembly is formed by a plurality of light emitting units, a plurality of light source assemblies form a light source array, the entire light source array is encapsulated by a single package, and each light emitting unit is individually controlled to emit light, the accuracy of the light beam emission of the light source array can be increased, the subsequent light beam projection calibration process can be simplified, and it is not necessary to weld a plurality of laser diodes to a circuit board as in the prior art, so the assembling process can be simplified and the required accuracy can be easily achieved.

[0096] In addition, the light emitting direction of the light emitting portion of the light emitting unit is perpendicular to the circuit board, and there is no need to provide a prism for deflecting the light beam, which can reduce the number of components of the light source structure.

[0097] The fast axis collimating mirror and the slow axis collimating mirror of the beam adjustment module form an integrated structure, and there is no need to separately dispose the fast axis collimating mirror and the slow axis collimating mirror as in the prior art. Therefore, when assembling the fast axis collimating mirror and the slow axis collimating mirror, there is no need for adjustment and calibration processes.

[0098] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made according to the claims and the description content of the present invention still fall within the scope covered by the patent of the present invention. In addition, any embodiment or patent application scope of the present invention does not have to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract part and the title are only used to assist in searching for patent documents and do not limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or patent application scope are only used to name components or distinguish different embodiments or scopes, and do not limit the upper or lower limits of the number of components.

Claims

1. A light source structure, characterized in that: It includes: A light source module comprises a substrate and at least one light source assembly, wherein the at least one light source assembly is formed on a supporting surface of the substrate, each light source assembly has a plurality of light emitting units, and each of the light emitting units has a light emitting portion; A circuit board, the light source module is arranged on the circuit board; A packaging component is disposed on the circuit board and surrounds the light source module, the packaging component is integrally formed and has a light-transmitting portion, and the light-emitting portions of the light-emitting units face the light-transmitting portion; and The light beam adjustment module is arranged on the light-transmitting part of the package. The light emitted by the light-emitting parts of the light-emitting unit passes through the light-transmitting part and the light beam adjustment module to form a working light beam.

2. The light source structure according to claim 1, characterized in that: Each of the light emitting units is individually controlled to emit light, and the light emitting portion emits light in a light emitting direction, the supporting surface of the substrate is perpendicular to the circuit board, and the light emitting direction is a direction away from and perpendicular to the circuit board; The light-transmitting portion of the package is a flat lens.

3. The light source structure according to claim 1, characterized in that: The light source module includes a plurality of light source components, which are arranged to form a light source array. Each of the light source components has the same or different number of light emitting units. The light emitting units are semiconductor light emitting units.

4. The light source structure according to claim 3, characterized in that: The number of the light emitting units of each light source assembly is less than or equal to eight, wherein the light emitting units are laser diode chips or vertical cavity surface emitting lasers.

5. The light source structure according to claim 3, characterized in that: The number of the light-emitting units of each light source assembly is four, and the light source module further includes a first electrode layer and a second electrode layer, the first electrode layer and the second electrode layer are arranged on the supporting surface of the substrate, and the first electrode layer and the second electrode layer are electrically connected to the circuit board, the first electrode layer is close to the first side of the light source array, the second electrode layer is close to the second side and the third side of the light source array, the second side is opposite to the third side, the first side is adjacent to the second side and the third side, and the light-emitting portions of the light-emitting units are located on the fourth side of the light source array, and the fourth side is opposite to the first side.

6. The light source structure according to claim 1, characterized in that: The beam adjustment module includes a fast axis collimator, which is adjacent to the light-transmitting portion of the package, and the light emitted by the light-emitting portions of the light-emitting unit passes through the light-transmitting portion and the fast axis collimator in sequence; The beam adjustment module further includes a slow axis collimator, which is connected to the fast axis collimator and the slow axis collimator forms an integrated structure with the fast axis collimator, and the light passing through the fast axis collimator passes through the slow axis collimator continuously; The fast axis collimator includes a convex lens portion and a first columnar portion connected to the convex lens portion, the slow axis collimator includes a concave lens portion and a second columnar portion connected to the concave lens portion, and the first columnar portion is connected to the second columnar portion; The light passes through the convex lens portion, the first columnar portion, the second columnar portion and the concave lens portion in sequence. The convex lens portion deflects the light in a first direction, and the concave lens portion deflects the light in a second direction, which is perpendicular to the first direction.

7. The light source structure according to claim 1, characterized in that: The beam adjustment module includes a slow axis collimator, which faces the light-transmitting portion of the package. The light emitted by the light-emitting portions of the light-emitting units passes through the light-transmitting portion and the slow axis collimator in sequence. The substrate has electrical insulation and thermal conductivity. The heat generated by the light-emitting units during operation is conducted by the substrate to dissipate the heat.

8. The light source structure according to any one of claims 1 to 7, characterized in that: The light emitting portion of each light emitting unit has a horizontal width dx, a vertical width dy, a horizontal light emitting angle θx and a vertical light emitting angle θy, wherein the horizontal width dx is a width parallel to the carrying surface, the vertical width dy is a width perpendicular to the carrying surface, the horizontal width ranges from 200 microns ≦ dx ≦ 400 microns, the vertical width ranges from 0.5 microns ≦ dy ≦ 15 microns, the horizontal light emitting angle ranges from 8 degrees ≦ θx ≦ 15 degrees, the vertical light emitting angle ranges from 20 degrees ≦ θy ≦ 40 degrees, 2 ≦ θy / θx ≦ 4, wherein the ratio of the spacing between two adjacent light emitting portions to the distance between the center points of the two adjacent light emitting portions is 20% to 40%; The range of the horizontal width dx is 348.25 microns ≦ dx ≦ 351.75 microns, the range of the vertical width dy is 0.995 microns ≦ dy ≦ 1.005 microns, the range of the horizontal luminous angle θx is 9.95 degrees ≦ θx ≦ 10.05 degrees, the range of the vertical luminous angle θy is 32.835 degrees ≦ θy ≦ 33.165 degrees, the range of the distance between the horizontal center points of two adjacent light-emitting portions is greater than or equal to 497.75 microns and less than or equal to 502.5 microns, and the range of the spacing between two adjacent light-emitting portions is greater than or equal to 149.25 microns and less than or equal to 150.75 microns.

9. An optical radar device, characterized in that: include: A housing having a transparent window; The light source structure as claimed in any one of claims 1 to 8, arranged in the housing; A scanning part having a plurality of reflecting mirrors, the scanning part rotates about an axis; A light receiving element is disposed in the housing and aligned with the window; as well as A calculation control unit, electrically connected to the light source structure, the scanning element and the light receiving element; The light source structure emits the working light beam, the scanning component rotates so that one of the reflective mirrors reflects the working light beam and then emits it to the outside through the window, and the emission angle of the working light beam changes with time. The working light beam is reflected by an external object and then received by the light receiving component, and the calculation control unit calculates the distance to the object according to the emission and reception status of the working light beam.

10. A method for assembling a light source structure, characterized in that: include: A substrate providing step: providing a substrate, wherein the substrate has a supporting surface; A light source module forming step: forming at least one light source assembly on the carrying surface, so that the light source assembly and the substrate constitute a light source module, each of the light source assembly has a plurality of light emitting units, and each of the light emitting units has a light emitting portion; Circuit board providing steps: providing a circuit board; Light source module assembly step: placing the light source module on the circuit board; The step of providing a package is as follows: providing a package, wherein the package has a light-transmitting portion; Package assembly steps: The packaging component is arranged on the circuit board to form a containing space, the light source module is arranged in the containing space, and the light emitting parts of the light emitting components correspond to the light transmitting part; The accommodating space is made into a vacuum state; The beam adjustment module providing step includes providing a beam adjustment module; and The light beam adjustment module assembly step is as follows: the light beam adjustment module is arranged corresponding to the light-transmitting portion, so that the light emitted by the light-emitting portions of the light-emitting units passes through the light beam adjustment module to form a working light beam.

11. The method for assembling a light source structure according to claim 10, wherein: The steps of forming the light source module further include: These light-emitting units are arranged to form individually controlled light-emitting units; The light emitting parts are set to emit light in the same light emitting direction; forming a plurality of light source components on the carrying surface; and Arrange the light source components into an array; The light source module assembly steps further include: The light source module is arranged on the circuit board in such a manner that the bearing surface of the substrate is perpendicular to the circuit board; The beam adjustment module further includes a slow axis collimator. The assembly steps of the beam adjustment module further include: The slow axis collimator is adjacent to the light-transmitting portion of the package. Wherein, the number of the light-emitting units of each of the light source components is less than or equal to eight, wherein the number of the light-emitting units of each of the light source components is four.

12. The method for assembling a light source structure according to claim 10, wherein: The beam adjustment module includes a fast axis collimator, and the assembly steps of the beam adjustment module further include: placing the fast axis collimator lens adjacent to the light-transmitting portion of the package; The beam adjustment module further includes a slow axis collimator, and the slow axis collimator is connected to the fast axis collimator to form an integrated structure. The fast axis collimator includes a convex lens portion and a first columnar portion connected to the convex lens portion. The slow axis collimator includes a concave lens portion and a second columnar portion connected to the concave lens portion. The first columnar portion is connected to the second columnar portion to form an integrated structure. The assembly steps of the beam adjustment module further include: The first columnar portion is adjacent to the light-transmitting portion of the package.

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