Laser ranging module

Abstract

A laser ranging module disclosed by the present invention comprises a substrate assembly, a protective cover and a first filter element, the substrate assembly comprises a substrate, and a light emitting element and a light receiving element connected to one side of the substrate, the light emitting element has an emitting region, and the light receiving element has a first receiving region; the protective cover assembly comprises a top cover and a side frame connected to the top cover, the protective cover assembly is connected to the substrate through the side frame, the top cover, the side frame and the substrate jointly define an inner cavity for containing the light emitting element and the light receiving element, and the top cover is provided with a light outlet hole corresponding to the light emitting element and a light inlet hole corresponding to the first receiving area. The light outlet hole and the light inlet hole penetrate through a first side and a second side which are oppositely arranged on the top cover; the top cover and the side frame are independent components, and the first light filtering element is connected to the first side of the top cover and covers the light inlet hole. According to the invention, the problems of internal stress and joint lines generated in the mold sealing process can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of laser distance measurement, and in particular to a laser distance measurement module. Background Art

[0002] The common laser ranging module currently includes a substrate, a protective cover and a filter. The substrate is provided with a light emitting chip and a light receiving chip. The protective cover is connected to the substrate and covers the light emitting chip and the light receiving chip. The protective cover has light exit holes and light entrance holes corresponding to the light emitting chip and the light receiving chip. In the related technology, the protective cover is usually integrally formed by an injection molding process. After the protective cover is formed, a certain internal stress will be generated. After the high-temperature baking process during packaging, the protective cover will have surface flatness problems. In addition, after the protective cover is formed, a mold line will be generated. Under special circumstances, the mold line will become a crack, thus causing defects. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a laser distance measurement module that can avoid the problems of internal stress and parting line generated during the molding process.

[0004] The laser ranging module according to the first embodiment of the present invention includes:

[0005] A substrate assembly, comprising a substrate and a light emitting element and a light receiving element connected to one side of the substrate, wherein the light emitting element has an emitting area and the light receiving element has a first receiving area;

[0006] A protective cover assembly, comprising a top cover and a side frame connected to the top cover, wherein the protective cover assembly is connected to the base plate through the side frame, wherein the top cover, the side frame and the base plate jointly define an inner cavity for accommodating the light emitting element and the light receiving element, wherein the top cover has a light emitting hole arranged corresponding to the light emitting element, and a light inlet hole arranged corresponding to the first receiving area, wherein the light emitting hole and the light inlet hole both penetrate to a first side and a second side of the top cover arranged oppositely;

[0007] A first filter element is located in the inner cavity;

[0008] The top cover and the side frame are independent components respectively, and the first filter element is connected to the first side of the top cover and covers the light entrance hole.

[0009] The laser ranging module according to the first embodiment of the present invention has at least the following beneficial effects:

[0010] The protective cover of the present embodiment is formed by connecting the top cover and the side frame rather than being integrally formed through a molding process. Therefore, the top cover can directly form light output holes and light input holes by, for example, drilling, thereby avoiding the problems of internal stress and mold lines generated during the molding process.

[0011] In other embodiments of the present invention, a first glue injection groove is provided on the surface of the first side, the laser ranging module also includes a first adhesive layer provided in the first glue injection groove, the first filter element covers the first glue injection groove, and is bonded to the first side through the first adhesive layer.

[0012] In other embodiments of the present invention, a plurality of the first glue injection grooves and the corresponding first adhesive layers are disposed on the surface of the first side, and the plurality of the first glue injection grooves are distributed along the circumference of the light entrance hole.

[0013] In other embodiments of the present invention, in the width direction of the top cover, the light entrance hole is arranged at the center of the top cover, and two first glue injection grooves are arranged on the surface of the first side, and the two first glue injection grooves are distributed on both sides of the light entrance hole along the width direction of the top cover.

[0014] In other embodiments of the present invention, the top cover includes a light shielding layer and an etching layer, the etching layer is arranged on a side of the light shielding layer facing the substrate assembly, and the first glue injection groove passes through the etching layer.

[0015] In other embodiments of the present invention, a first exhaust groove is disposed on the surface of the first side, one end of the first exhaust groove is connected to the light entrance hole, and the other end of the first exhaust groove extends outside the coverage area of ​​the first filter element to form a first exhaust port.

[0016] In other embodiments of the present invention, the first exhaust groove includes a first groove section arranged corresponding to the light entrance hole, and a second groove section connected to the first groove section, and the second groove section extends away from one end of the first groove section to outside the coverage area of ​​the first filter element to form the first exhaust port.

[0017] In other embodiments of the present invention, the surface of the first side is further provided with two first glue injection grooves separated from the first exhaust groove, the laser ranging module further includes a first adhesive layer provided in the first glue injection grooves, the first filter element covers the first glue injection grooves, and is bonded to the first side through the first adhesive layer;

[0018] In the width direction of the top cover, the light entrance hole is arranged at the center of the laser ranging module, the two first glue injection grooves are distributed on both sides of the light entrance hole along the width direction of the top cover, and the first exhaust groove is arranged between the two first glue injection grooves and extends along the length direction of the laser ranging module.

[0019] In other embodiments of the present invention, the top cover includes a light shielding layer and an etching layer, the etching layer is arranged on a side of the light shielding layer facing the substrate assembly, and the first exhaust groove passes through the etching layer.

[0020] In other embodiments of the present invention, the side frame is configured as a molded body formed on the top cover through a molding process.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 A schematic diagram of the movement of thermoplastic material during the process of forming a top cover of a protective cover through a typical mold structure;

[0024] Figure 2 This is a three-dimensional schematic diagram of a laser ranging module in an embodiment of the present invention;

[0025] Figure 3 for Figure 2 Cross-sectional view of the laser ranging module;

[0026] Figure 4 for Figure 2 Schematic diagram of the laser ranging module;

[0027] Figure 5 for Figure 2 A bottom view of the middle protective cover assembly;

[0028] Figure 6 for Figure 5 A cross-sectional view of the middle protective cover assembly, wherein the section plane passes through the center of the light entrance hole and is parallel to the width direction of the top cover.

[0029] Reference numerals:

[0030] Side wall 10, column 20;

[0031] substrate 100;

[0032] Light emitting element 200, emitting area 210;

[0033] Light receiving element 300, first receiving area 310, second receiving area 320;

[0034] A first filter element 400;

[0035] A second filter element 500;

[0036] Top cover 600, light exit hole 610, light entrance hole 620, first glue injection groove 630, first exhaust groove 640, first groove section 641, second groove section 642, first exhaust port 643, light shielding layer 650, etching layer 660, second glue injection groove 670, second exhaust groove 680, second exhaust port 681;

[0037] Side frame 700;

[0038] A first adhesive layer 800;

[0039] A second adhesive layer 900;

[0040] Partition wall 1000. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0045] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0046] As mentioned above, the current protective cover is usually prepared by an integrated injection molding process. In order to form structures such as light exit holes and light entrance holes, the protective cover will generate certain internal stress after molding, and will also produce a mold line. For details, refer to Figure 1 , shows a schematic diagram of the movement of thermoplastic material in the process of forming the top cover of the protective cover through a typical mold structure. The mold includes a side wall 10 and a column 20. The side wall 10 is surrounded by a cavity for accommodating the molding material. The column 20 is arranged corresponding to the light exit hole and the light entrance hole. The heated thermoplastic material is injected from the central part of the length direction of the side wall 10 and converges from both sides of the column 20 along the arrow direction in the figure. After molding, a mold line will be generated at the intersection of the thermoplastic materials on both sides (illustrated by a dotted line in the figure). Since the thermoplastic material hardly undergoes a cross-linking reaction at the intersection, the connection strength at the mold line after molding is very low, which easily leads to cracking problems. On the other hand, due to the inconsistency of the thermal expansion coefficients between the substrate and the protective cover, the deformation caused by thermal expansion and contraction of the two is large, and the laser ranging module including the protective cover needs to undergo multiple baking steps during the preparation process, so it is easy to warp and deform due to thermal expansion and contraction. Based on this, the present invention proposes a laser ranging module, which sets the protective cover as a split structure, so as to improve the problems of surface flatness and parting line in the one-piece molding process. In addition, the filter element is set on the top cover of the protective cover assembly in this embodiment, which can form a sealed cavity and prevent debris from entering the interior of the laser ranging module.

[0047] Reference Figures 2 to 4 The laser ranging module includes a substrate assembly, a protective cover assembly and a first filter element 400. The substrate assembly includes a substrate 100, a light emitting element 200 and a light receiving element 300. The light emitting element 200 and the light receiving element 300 are connected to one side of the substrate 100. Figure 3On the upper side of the substrate 100, the light emitting element 200 can emit a laser for detection (for ease of description, referred to as the outgoing light), and the light receiving element 300 has a first receiving area 310, and the first receiving area 310 can receive the laser reflected by the object to be measured (for ease of description, referred to as the incident light). In this way, the laser ranging module obtains the distance of the object to be measured based on the relevant parameters between the outgoing light and the incident light (such as time difference, phase difference), etc. In addition, the substrate assembly also includes a lead connecting the light emitting element 200 and the substrate, and a lead connecting the light receiving element 300 and the substrate. Exemplarily, the light emitting element 200 is a laser, such as a vertical cavity surface emitting laser (VCSEL, Vertical-Cavity Surface-Emitting Laser). In some embodiments, the first receiving area 310 is arranged on the side of the light receiving element 300 away from the substrate 100, that is, Figure 4 The upper side of the .

[0048] The protective cover assembly is connected to the substrate 100 and defines an inner cavity for accommodating the light emitting element 200 and the light receiving element 300 with the substrate 100. For example, the protective cover assembly is approximately a rectangular shell. Figures 2 to 4 The protective cover assembly in this embodiment is configured as a split structure, and the top cover 600 and the side frame 700 are independent components (it should be noted that the independent components referred to here refer to the protective cover assembly being assembled or connected by at least two parts, rather than referring to the components of the protective cover assembly being in a separated state). Specifically, the protective cover assembly includes a top cover 600 and a side frame 700 connected to the top cover 600, and the protective cover assembly is connected to the substrate 100 through the side frame 700, so that the top cover 600, the side frame 700 and the substrate 100 jointly define the aforementioned inner cavity. Exemplarily, the side frame 700 is a rectangular frame with openings at both ends, and the top cover 600 and the substrate 100 are respectively connected to the upper and lower ends of the side frame 700. In this embodiment, the side frame 700 is made of thermosetting material. Exemplarily, the side frame 700 is molded by molding resin. The general molding method is to heat the solid molding resin material to melt it into a flowable liquid material, and then inject the molten liquid material into the mold cavity formed by the mold and the top cover 600. After cooling and solidification, the side frame 700 connected to the top cover 600 can be directly obtained.

[0049] In this embodiment, the top cover 600 has a light exit hole 610 arranged corresponding to the light emitting element 200, and a light entrance hole 620 arranged corresponding to the first receiving area 310. The light exit hole 610 and the light entrance hole 620 both penetrate to the first side and the second side of the top cover 600 that are oppositely arranged, that is, penetrate the top cover 600 along the thickness direction. The protective cover of the present embodiment is formed by connecting the top cover 600 and the side frame 700. On the one hand, the top cover 600 can adopt a currently known non-injection molded plate, such as a PCB board, and directly form the light outlet 610 and the light entrance 620 by drilling, etc. Since the protective cover is not made by an injection molding process, there is no intersection of thermoplastic materials, so there is no problem of easy cracking at the parting line. At the same time, the side frame 700 of the present embodiment is clamped between the top cover 600 and the substrate 100. The warping direction caused by the inconsistent thermal expansion coefficients of the top cover 600 and the side frame 700 is exactly opposite to the warping direction caused by the inconsistent thermal expansion coefficients of the substrate 100 and the side frame 700. The deformations in the two directions offset each other, which can improve the problem of warping deformation. In some specific embodiments, the thermal expansion coefficient of the top cover 600 is basically consistent with the thermal expansion coefficient of the substrate 100 (the meaning of basically consistent includes that the two are exactly the same, or although there are differences between the two, the deviation is small, such as the deviation is within 10%). Exemplarily, the top cover 600 and the substrate 100 are the same plate. In summary, compared with the conventional one-piece injection-molded protective cover, this embodiment can not only solve the problem of easy cracking at the parting line, but also significantly improve the problem of warping and deformation of the protective cover.

[0050] In addition, in this embodiment, the first filter element 400 is connected to the first side of the top cover 600, for example Figure 3 The lower side of the protective cover assembly is covered with the light entrance hole 620, thereby preventing debris from entering the interior of the protective cover assembly through the light entrance hole 620.

[0051] Based on the first embodiment, in some embodiments of the present invention, referring to Figure 4 The light receiving element 300 also has a second receiving area 320, and the second receiving area 320 is used to receive the laser emitted by the light emitting element 200, that is, a part of the outgoing light emitted by the light emitting element 200 is emitted from the light exit hole, and the other part is received by the second receiving area 320. In this way, the distance of the object to be measured can be obtained by the parameters between the incident light received by the first receiving area 310 and the outgoing light received by the second receiving area 320. Specifically, the outgoing light emitted by the light emitting element 200 is emitted from the light exit hole, and at the same time, the second receiving area 320 receives the light emitted by the light emitting element 200 and starts timing. In this way, the distance of the object to be measured can be obtained by multiplying the time difference of the signal of the light emitted from the light exit hole received by the first receiving area 310 and the light reflected back by the object by the speed of light.

[0052] In order to avoid mutual interference between the first receiving area 310 and the second receiving area 320, the first receiving area 310 and the second receiving area 320 need to be respectively arranged in two chambers. Figure 4 The protective cover assembly further includes a partition wall 1000, which is connected to the top cover 600 and, together with the light receiving element 300, separates the inner cavity into a first cavity and a second cavity that are mutually opaque. For example, Figure 3 The cavity on the left side is the first cavity, and the cavity on the right side is the second cavity. The first receiving area 310 is located in the first cavity, and the second receiving area 320 and the emitting area 210 are located in the second cavity.

[0053] When the light receiving element 300 further has a second receiving area 320, in some embodiments of the present invention, Figure 3 , Figure 4 The laser ranging module also includes a second filter element 500 located in the second cavity. The second filter element 500 is connected to the first side of the top cover 600 and covers the light outlet hole 610, so as to prevent debris from entering the interior of the protective cover assembly through the light outlet hole 610.

[0054] Based on the above, by providing the first filter element 400 and the second filter element 500 , the light entrance hole 620 and the light exit hole 610 can be sealed, thereby further preventing debris from entering the interior of the protective cover assembly.

[0055] Based on the first embodiment, in some embodiments of the present invention, referring to Figure 5 , Figure 6 , Figure 5 The dotted lines in the figure indicate the approximate positions of the filter element and the adhesive layer after the filter element and the top cover 600 are bonded. As shown in the figure, the surface of the first side of the top cover 600 is provided with a first glue injection groove 630, and the laser distance measurement module further includes a first adhesive layer 800 provided in the first glue injection groove 630. The first filter element 400 covers the first glue injection groove 630 and is bonded to the first side through the first adhesive layer 800. By providing the first glue injection groove 630 capable of accommodating the first adhesive layer 800, the first filter element 400 can be kept in close contact with the top cover 600, thereby ensuring the sealing effect of the first filter element 400 on the light entrance hole 620.

[0056] When the surface of the first side of the top cover 600 is provided with a first glue injection groove 630, in some specific embodiments of the present invention, Figure 5 The surface of the first side is provided with a plurality of first glue injection grooves 630 and corresponding first adhesive layers 800, and the plurality of first glue injection grooves 630 are distributed along the circumference of the light entrance hole 620, thereby increasing the pasting position between the first filter element 400 and the top cover 600, thereby ensuring the bonding strength between the first filter element 400 and the top cover 600 and the sealing effect on the light entrance hole 620.

[0057] In some specific embodiments, referring to Figure 5 , Figure 6 In the width direction of the top cover 600, the light entrance hole 620 is arranged at the center of the top cover 600, that is, the center of the light entrance hole 620 is located on or near the symmetry axis in the width direction of the top cover 600. On this basis, two first glue injection grooves 630 are arranged on the surface of the first side of the top cover 600, and the two first glue injection grooves 630 are distributed on both sides of the light entrance hole 620 along the width direction of the top cover 600. Figure 4 As shown, the typical layout structure of the laser ranging module is that the light emitting element 200 and the light receiving element 300 are distributed along the length direction, and the first receiving area 310 is arranged near the end, so the light entrance hole 620 is also near one end of the top cover 600 in the length direction (for example Figure 5 The left end of the top cover 600 is arranged, so the space between the light entrance hole 620 and the short side of the top cover 600 is small. On the other hand, the light entrance hole 620 is usually arranged in the center along the width direction of the light receiving element 300, so the space between the light entrance hole 620 and the long side of the top cover 600 is large. In this embodiment, the two first glue injection grooves 630 are arranged on both sides of the light entrance hole 620 along the width direction of the top cover 600, which can adapt to the distribution of the hole positions on the top cover 600, thereby making full use of the free space of the top cover 600.

[0058] When the surface of the first side of the top cover 600 is provided with a first glue injection groove 630, in some specific embodiments of the present invention, Figure 6 The top cover 600 includes a light shielding layer 650 and an etching layer 660. The light shielding layer 650 is made of an opaque material. The etching layer 660 is arranged on the side of the light shielding layer 650 facing the substrate assembly. The first glue injection groove 630 passes through the etching layer 660. Specifically, the first glue injection groove 630 is formed by an etching process. In this embodiment, the top cover 600 is arranged as a layered structure, and the first glue injection groove 630 is formed by an etching process, which helps to improve production efficiency and reduce production costs.

[0059] It should be noted that the etching layer 660 may be a single-layer structure or a multi-layer structure. Exemplarily, the etching layer 660 includes a copper layer connected to the light shielding layer 650 and a green oil layer connected to the copper layer.

[0060] In other embodiments, the top cover 600 may also be a single-layer structure, and the first glue injection groove 630 is processed by milling or other processes.

[0061] In some other embodiments, when the laser distance measurement module further includes a second filter element 500 covering the light exit hole 610, refer to Figure 5The surface of the first side of the top cover 600 is provided with a second glue injection groove 670, the laser distance measurement module further includes a second adhesive layer 900 provided in the second glue injection groove 670, and the second filter element 500 covers the second glue injection groove 670 and is adhered to the first side through the second adhesive layer 900. By providing the second glue injection groove 670 capable of accommodating the second adhesive layer 900, the second filter element 500 can be kept in close contact with the top cover 600, thereby ensuring the sealing effect of the second filter element 500 on the light exit hole 610.

[0062] Based on the first embodiment, in some embodiments of the present invention, referring to Figure 5 , Figure 6 , a first exhaust groove 640 is provided on the surface of the first side of the top cover 600, one end of the first exhaust groove 640 is connected to the light entrance hole 620, and the other end extends to the outside of the coverage area of ​​the first filter element 400 to form a first exhaust port 643, so that the inner cavity of the laser ranging module can be connected with the outside through the first exhaust groove 640 to achieve the balance of the air pressure between the two, which can avoid the problem that the gas in the inner cavity expands due to heat when the laser ranging module is baked and forms a pressure difference with the external environment, thereby causing the first filter element 400 to break. In addition, since the first exhaust groove 640 forms the first exhaust port 643 outside the coverage area of ​​the first filter element 400, and the first exhaust port 643 is staggered with the light entrance hole 620, it is difficult for external debris to directly enter the inner cavity of the laser ranging module through the first exhaust groove 640, so that the exhaust function can be achieved without affecting the sealing effect of the first filter element 400 on the light entrance hole 620.

[0063] In some other embodiments, when the laser ranging module further includes a second filter element 500 covering the light exit hole 610, refer to Figure 5 , Figure 6 A second exhaust groove 680 is also provided on the surface of the first side of the top cover 600. One end of the second exhaust groove 680 is connected to the light exit hole 610, and the other end extends outside the coverage area of ​​the second filter element 500 to form a second exhaust port 681. In this way, the problem of the second filter element 500 being broken due to the internal and external pressure difference can be avoided.

[0064] When the surface of the first side of the top cover 600 is provided with a first exhaust groove 640, in some embodiments of the present invention, Figure 5 The first exhaust slot 640 includes a first slot section 641 corresponding to the light incident hole 620, and a second slot section 642 connected to the first slot section 641, and one end of the second slot section 642 away from the first slot section 641 extends outside the coverage area of ​​the first filter element 400 to form a first exhaust port 643. Exemplarily, the first slot section 641 is set to be circular corresponding to the light incident hole 620, and its radius is greater than the radius of the light incident hole 620, and the second slot section 642 is set to be a long strip.

[0065] In some specific embodiments, referring to Figure 5 The surface of the first side of the top cover 600 is further provided with two first glue injection grooves 630, which are separated from the first exhaust groove 640 to prevent the adhesive material from entering the light entrance hole 620 through the exhaust groove. The laser ranging module also includes a first adhesive layer 800 disposed in the first glue injection groove 630, and the first filter element 400 covers the first glue injection groove 630 and is bonded to the first side through the first adhesive layer 800. The first glue injection groove 630 and the first adhesive layer 800 in this embodiment can be understood with reference to the aforementioned embodiment.

[0066] In the width direction of the laser ranging module, the light entrance hole 620 is arranged at the center of the laser ranging module, and the two first glue injection grooves 630 are distributed on both sides of the light entrance hole 620 along the width direction of the laser ranging module. The first exhaust groove 640 is arranged between the two first glue injection grooves 630 and extends along the length direction of the laser ranging module. As mentioned above, the typical layout structure of the laser ranging module is that the light emitting element 200 and the light receiving element 300 are distributed along the length direction, and the first receiving area 310 is arranged near the end, so the light entrance hole 620 is also close to one end of the top cover 600 in the length direction (for example Figure 5 On the other hand, the light entrance hole 620 is usually arranged in the center along the width direction of the light receiving element 300, so the space between the light entrance hole 620 and the long side of the top cover 600 is relatively large. The aforementioned layout method adopted in this embodiment can adapt to the distribution of the hole positions on the top cover 600, thereby making full use of the free space of the top cover 600 and facilitating the extension of the exhaust groove so that its end is exposed from the coverage range of the filter element.

[0067] When the surface of the first side of the top cover 600 is provided with a first exhaust groove 640, in some embodiments of the present invention, Figure 6 The top cover 600 includes a light shielding layer 650 and an etching layer 660. The light shielding layer 650 is made of an opaque material. The etching layer 660 is arranged on the side of the light shielding layer 650 facing the substrate assembly. The first exhaust groove 640 passes through the etching layer 660. Specifically, the first exhaust groove 640 is formed by an etching process. In this embodiment, the top cover 600 is arranged as a layered structure, and the first exhaust groove 640 is formed by an etching process, which helps to improve production efficiency and reduce production costs.

[0068] It should be noted that the etching layer 660 may be a single-layer structure or a multi-layer structure. Exemplarily, the etching layer 660 includes a copper layer connected to the light shielding layer 650 and a green oil layer connected to the copper layer.

[0069] In other embodiments, the top cover 600 may also be a single-layer structure, and the first exhaust groove 640 may be processed by milling or other processes.

[0070] It should be noted that the aforementioned second glue injection groove 670 and the second exhaust groove 680 can also be formed by an etching process.

[0071] On the basis of the first embodiment, in some embodiments of the present invention, the side frame 700 is configured as a molded body formed on the top cover 600 by a mold-sealing process. The protective cover in the related art is formed by an injection molding process, and after molding, it is a single-grain structure. Therefore, a specific carrier is required as a carrier during the assembly process, which increases the material consumption on the one hand, and also increases the steps of transferring the protective cover to the carrier and removing it from the carrier on the other hand, affecting the production efficiency. In this embodiment, the top cover 600 can be a whole plate, and the light outlet hole 610, the light entrance hole 620, the glue injection groove, the exhaust groove and other structures corresponding to each top cover 600 are pre-formed on the whole plate, and then the corresponding filter element is connected to the whole plate, and then the side frame 700 corresponding to each top cover 600 is molded on the whole plate, and finally the single-grain laser ranging module is obtained by cutting. Since the present embodiment uses a whole plate, the use of a carrier and the related transfer steps can be omitted, which helps to reduce costs and improve efficiency.

[0072] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. Laser ranging module, characterized in that: include: A substrate assembly, comprising a substrate and a light emitting element and a light receiving element connected to one side of the substrate, wherein the light emitting element has an emitting area and the light receiving element has a first receiving area; A protective cover assembly, made of a thermosetting material, comprising a top cover and a side frame connected to the top cover, wherein the protective cover assembly is connected to the base plate through the side frame, wherein the top cover, the side frame and the base plate jointly define an inner cavity for accommodating the light emitting element and the light receiving element, wherein the top cover has a light emitting hole arranged corresponding to the light emitting element, and a light inlet hole arranged corresponding to the first receiving area, wherein the light emitting hole and the light inlet hole both penetrate to a first side and a second side of the top cover which are arranged oppositely; A first filter element is located in the inner cavity; The top cover and the side frame are independent components respectively, and the first filter element is connected to the first side of the top cover and covers the light entrance hole.

2. The laser ranging module according to claim 1, characterized in that: A first glue injection groove is provided on the surface of the first side, and the laser ranging module also includes a first adhesive layer provided in the first glue injection groove. The first filter element covers the first glue injection groove and is bonded to the first side through the first adhesive layer.

3. The laser ranging module according to claim 2, characterized in that: A plurality of the first glue injection grooves and the corresponding first adhesive layer are disposed on the surface of the first side, and the plurality of the first glue injection grooves are distributed along the circumference of the light incident hole.

4. The laser ranging module according to claim 3, characterized in that: In the width direction of the top cover, the light entrance hole is arranged at the center of the top cover, and two first glue injection grooves are arranged on the surface of the first side, and the two first glue injection grooves are distributed on both sides of the light entrance hole along the width direction of the top cover.

5. The laser ranging module according to claim 2, characterized in that: The top cover includes a light shielding layer and an etching layer. The etching layer is arranged on a side of the light shielding layer facing the substrate assembly, and the first glue injection groove passes through the etching layer.

6. The laser ranging module according to claim 1, characterized in that: A first exhaust groove is disposed on the surface of the first side, one end of the first exhaust groove is connected to the light entrance hole, and the other end of the first exhaust groove extends outside the coverage area of ​​the first filter element to form a first exhaust port.

7. The laser ranging module according to claim 6, characterized in that: The first exhaust slot includes a first slot section arranged corresponding to the light entrance hole, and a second slot section connected to the first slot section, wherein one end of the second slot section away from the first slot section extends outside the coverage area of ​​the first filter element to form the first exhaust port.

8. The laser ranging module according to claim 7, characterized in that: The surface of the first side is further provided with two first glue injection grooves separated from the first exhaust groove, the laser ranging module further includes a first adhesive layer provided in the first glue injection grooves, the first filter element covers the first glue injection grooves, and is bonded to the first side through the first adhesive layer; In the width direction of the top cover, the light entrance hole is arranged at the center of the laser ranging module, the two first glue injection grooves are distributed on both sides of the light entrance hole along the width direction of the top cover, and the first exhaust groove is arranged between the two first glue injection grooves and extends along the length direction of the laser ranging module.

9. The laser ranging module according to claim 6, characterized in that: The top cover includes a light shielding layer and an etching layer. The etching layer is arranged on a side of the light shielding layer facing the substrate assembly, and the first exhaust groove passes through the etching layer.

10. The laser ranging module according to claim 1, characterized in that: The side frame is configured as a molded body formed on the top cover through a mold sealing process.

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