Laser ranging device

Abstract

The utility model provides a laser ranging device which comprises a shell, a circuit assembly and an optical collimating mirror structure. The optical collimating lens structure comprises a fixing module, a separator, a transmitting optical lens and a receiving optical lens, one side of the fixing module is provided with a fixing cavity used for fixing a TOF chip, the other side of the fixing module is provided with the separator, the transmitting optical lens and the receiving optical lens, the separator is located between the transmitting optical lens and the receiving optical lens, and the separator is located between the transmitting optical lens and the receiving optical lens. The transmitting optical lens corresponds to a first transmitting light through hole in the fixed cavity, and the receiving optical lens corresponds to a first receiving light through hole in the fixed cavity. According to the laser distance measuring device, the first transmitting light through hole and the transmitting optical lens form a laser transmitting light path, the first receiving light through hole and the receiving optical lens form a laser receiving light path, and a double-light-path system is adopted, so that light path interference is reduced, and the measuring precision is improved; meanwhile, only the separator is arranged between the transmitting optical lens and the receiving optical lens, the structure is compact and stable, and the size is small.

Description

Technical Field

[0001] This utility model relates to the field of laser ranging equipment, and in particular to a laser ranging device. Background Technology

[0002] Currently, laser rangefinders are high-precision distance measurement devices based on laser technology, widely used in industrial automation, robot navigation, construction engineering, and autonomous driving. Their basic principle is to calculate the distance between the target object and the measuring device by emitting a laser beam and measuring the time difference (Time of Flight, TOF) between the emitted and received reflected light.

[0003] However, existing laser ranging devices typically employ a single optical system for laser emission and reception. In such systems, the same set of optical components (such as lenses and mirrors) is usually required for both transmission and reception. To ensure that the emitted laser and the received reflected light can pass through the same optical path, the system needs to be designed with complex optical path switching or beam splitting devices (such as beam splitters and semi-transparent mirrors). These additional optical components not only increase the system's complexity but also its overall size, making it difficult to meet the miniaturization and integration requirements of modern devices.

[0004] Therefore, it is necessary to provide a laser ranging device to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a laser ranging device to solve the problems of existing laser ranging devices having insufficient compactness and large size, thus meeting the needs of modern equipment for miniaturization and integration.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is: a laser ranging device, which includes: a shell, a circuit assembly, and an optical collimating lens structure connected to the circuit assembly;

[0007] The circuit assembly includes a circuit board, a TOF chip disposed on one side of the circuit board, and connection terminals disposed on the other side of the circuit board;

[0008] The optical collimating lens structure includes a fixing module, an isolator, an emitting optical lens, and a receiving optical lens. One side of the fixing module is provided with a fixing cavity for fixing the TOF chip. A first emitting light-passing hole for the TOF chip to emit laser light and a first receiving light-passing hole for the TOF chip to receive laser light are provided through the fixing cavity. The other side of the fixing module is provided with the isolator, the emitting optical lens, and the receiving optical lens. The isolator is located between the emitting optical lens and the receiving optical lens. The emitting optical lens corresponds to the first emitting light-passing hole, and the receiving optical lens corresponds to the first receiving light-passing hole.

[0009] The circuit components and the optical collimating lens structure are disposed inside the housing. The housing is provided with a socket corresponding to the connection terminal, a second emission light-passing hole corresponding to the emitting optical lens, and a second receiving light-passing hole corresponding to the receiving optical lens.

[0010] In this utility model, the outer shell includes a main shell and a bottom cover. The second light-emitting hole and the second light-receiving hole are disposed on one side of the main shell. The side of the main shell opposite to the second light-emitting hole is provided with a mounting opening. The bottom cover is encapsulated and connected to the mounting opening. Both ends of the bottom cover are provided with lugs protruding from the side of the main shell, and the lugs are provided with mounting holes.

[0011] The insertion hole is located on one side of the main housing, and the insertion hole and the second light-emitting hole are located on adjacent sides of the main housing, respectively.

[0012] In addition, the insertion hole is provided on the bottom cover, and the insertion hole is located on the side of the bottom cover opposite to the second light-emitting hole.

[0013] In this invention, the laser ranging device further includes a packaging cover, which is sleeved on the outer periphery of the emitting optical lens and the receiving optical lens. The packaging cover is provided with an emitting protrusion inserted into the second emitting light-transmitting hole and a receiving protrusion inserted into the second receiving light-transmitting hole.

[0014] The transmitting protrusion and the receiving protrusion are either solid structures that allow light to pass through or axially through structures.

[0015] In this utility model, a boss is provided on the outer side of the outer shell, and a connecting groove for installing the encapsulation cover is provided on the inner wall of the outer shell corresponding to the position of the boss.

[0016] A connecting post is provided on the inner wall of the housing. A screw passes through the circuit board and is threaded to the connecting post. The optical collimating lens structure and the encapsulation cover are clamped between the circuit board and the connecting groove.

[0017] Furthermore, a positioning protrusion is provided on the inner wall of the connecting groove, and a positioning recess corresponding to the positioning protrusion is provided on the outer side of the encapsulation cover.

[0018] In this utility model, the emitting optical lens includes an emitting lens body and an emitting edge plate. The emitting edge plate is integrally formed and connected to the circumferential side of the emitting lens body. The emitting edge plate has an arc-shaped structure. The isolation member includes an emitting mating plate. The emitting mating plate has an arc-shaped structure. The emitting mating plate and the emitting edge plate are mated to form an annular structure surrounding the emitting lens body.

[0019] The receiving optical lens includes a receiving lens body and a receiving edge plate. The receiving edge plate is integrally formed and connected to the circumference of the receiving lens body. The receiving edge plate has an arc-shaped structure. The isolation member includes a receiving mating plate. The receiving mating plate has an arc-shaped structure. The receiving mating plate and the receiving edge plate are mated to form an annular structure surrounding the receiving lens body.

[0020] In this invention, the emitting optical lens and the receiving optical lens are made of polymethyl methacrylate material with a refractive index of 1.49, and the surfaces of the emitting edge plate and the receiving edge plate are frosted.

[0021] Compared with the prior art, the advantages of this utility model are as follows: The laser ranging device of this utility model fixes the TOF chip in the fixed cavity of the fixed module, and the first emitting light-passing hole and the emitting optical lens form a laser emitting optical path, and the first receiving light-passing hole and the receiving optical lens form a laser receiving optical path. It adopts a dual optical path system, which reduces optical path interference and improves measurement accuracy. At the same time, only an isolation component is set between the emitting optical lens and the receiving optical lens, resulting in a compact and stable structure with a small size. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0023] Figure 1 This is a schematic diagram of a preferred embodiment of the laser ranging device of this utility model.

[0024] Figure 2 This is an exploded structural diagram showing the laser rangefinder of this invention with its insertion hole set on the bottom cover.

[0025] Figure 3 This is an exploded structural diagram of the laser rangefinder device of this utility model with the insertion hole set on the main housing.

[0026] Figure 4 This is an exploded view of the optical collimating lens structure of the laser rangefinder of this invention. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0029] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, a connection can be a detachable connection or a connection of an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Existing laser ranging devices typically use a single optical system for laser emission and reception. A single optical system requires the design of complex optical path switching or beam splitting devices. These additional optical components not only increase the complexity of the system but also increase the overall size. The larger size of the device makes it difficult to meet the requirements of miniaturization and integration of modern equipment.

[0032] The following is a preferred embodiment of a laser ranging device provided by this utility model that can solve the above-mentioned technical problems.

[0033] Please refer to Figures 1-4 In the diagram, units with similar structures are represented by the same labels.

[0034] This embodiment provides a laser ranging device, which includes: a housing 1, a circuit assembly 2, and an optical collimating lens structure 3 connected to the circuit assembly 2.

[0035] Please refer to Figure 3 In this embodiment, the circuit assembly 2 includes a circuit board 21, a TOF chip 23 disposed on one side of the circuit board 21, and a connection terminal 22 disposed on the other side of the circuit board 21. The circuit assembly 2 is electrically connected to an external device through the connection terminal.

[0036] Please refer to Figure 2 and Figure 4 In this embodiment, the optical collimating lens structure 3 includes a fixing module 31, an isolator 34, an emitting optical lens 32, and a receiving optical lens 33. One side of the fixing module 31 has a fixing cavity 311 for fixing the TOF chip 23. The fixing cavity 311 ensures the positional accuracy and stability of the TOF chip 23 relative to the optical collimating lens structure 3. A first emitting light-passing hole 312 for the TOF chip 23 to emit laser light and a first receiving light-passing hole 313 for the TOF chip 23 to receive laser light are provided through the fixing cavity 311.

[0037] On the other side of the fixed module 31, an isolator 34, a transmitting optical lens 32, and a receiving optical lens 33 are arranged. The isolator 34 is located between the transmitting optical lens 32 and the receiving optical lens 33. The transmitting optical lens 32 corresponds to the first transmitting light-passing hole 312, and the receiving optical lens 33 corresponds to the first receiving light-passing hole 313. Only the isolator 34 is arranged between the transmitting optical lens 32 and the receiving optical lens 33, resulting in a compact, stable structure and small size.

[0038] The laser emitted by the TOF chip 23 passes through the first emitting aperture 312 and the emitting optical lens 32. After external reflection, the returning laser passes through the receiving optical lens 33 and the first receiving aperture 313 and is received by the TOF chip 1. By employing a dual-optical-path system, the laser emitting optical path and the laser receiving optical path are independent of each other. The emitting optical lens and the receiving optical lens are located on opposite sides of the isolator, ensuring that the emitting and receiving optical paths do not interfere with each other.

[0039] In this embodiment, the circuit component 2 and the optical collimating lens structure 3 are disposed inside the housing 1. The housing 1 is provided with a socket corresponding to the connection terminal 22, a second light-transmitting aperture 112 corresponding to the emitting optical lens 32, and a second light-transmitting aperture 113 corresponding to the receiving optical lens 33.

[0040] In this embodiment, the outer casing 1 includes a main casing 11 and a bottom cover 12. A second emitting light-transmitting hole 112 and a second receiving light-transmitting hole 113 are disposed on one side of the main casing 11. The side of the main casing 11 facing away from the second emitting light-transmitting hole 112 is provided with a mounting opening. The bottom cover 12 is encapsulated and connected to the mounting opening. Both ends of the bottom cover 12 are provided with lugs 121 protruding from the side of the main casing 11. Mounting holes 122 are provided on the lugs 121 so that the laser rangefinder can be installed in a set position through the mounting holes 122.

[0041] In this utility model, reference is made to Figure 1 The orientation of the view depends on the actual usage requirements. The position of the socket can be set on the side or bottom of the housing 1. The specific setting of the socket is as follows:

[0042] Please refer to Figure 3 Firstly, the jack 117 can be located on one side of the main housing 11, and the jack 117 and the second light transmission hole 112 are located on adjacent sides of the main housing 11.

[0043] Please refer to Figure 2 Secondly, the insertion hole 123 can be set on the bottom cover 12, and the insertion hole 123 is located on the side of the bottom cover 12 that is away from the second light transmission hole 112.

[0044] By placing the sockets at different locations on the housing 1, users can select different laser rangefinders for different application environments, and the external power cord can be conveniently connected to the connection terminal 22 on the laser rangefinder.

[0045] Please refer to Figure 2 and Figure 3 In this embodiment, the laser ranging device further includes a casing 4, which is fitted around the outer periphery of the emitting optical lens 32 and the receiving optical lens 33. The casing 4 is provided with an emitting protrusion 42 that inserts into the second emitting light-transmitting hole 112 and a receiving protrusion 43 that inserts into the second receiving light-transmitting hole 113. The casing 4 protects and secures the emitting optical lens 32 and the receiving optical lens 33, ensuring the alignment and sealing of the optical path.

[0046] Optionally, the transmitting protrusion 42 and the receiving protrusion 43 can be solid structures that are transparent to light.

[0047] Optionally, the transmitting protrusion 42 and the receiving protrusion 43 can also be axially continuous structures.

[0048] Please refer to Figure 1 and Figure 2In this embodiment, a boss 111 is provided on the outer side of the outer shell 1, and a connecting groove 114 for mounting the encapsulation cover 4 is provided on the inner wall of the outer shell 1 at the position corresponding to the boss 111. In this way, the overall volume of the outer shell 1 is smaller, and there is enough space inside the main shell 11 to set the optical collimating lens structure 3 and the encapsulation cover 4.

[0049] A connecting post 116 is provided on the inner wall of the outer casing 1. Screws pass through the circuit board 21 and are threaded to the connecting post 116. The optical collimating lens structure 3 and the encapsulation cover 4 are clamped between the circuit board 21 and the connecting groove 114. By fixing the circuit board 21, the optical collimating lens structure 3 and the encapsulation cover 4 can be stably set up. There are fewer connection points, and the disassembly and assembly are convenient.

[0050] Please refer to Figure 2 In this embodiment, a positioning protrusion 115 is provided on the inner wall of the connecting groove 114, and a positioning recess 41 corresponding to the positioning protrusion 115 is provided on the outer side of the encapsulation cover 4, so that the encapsulation cover 4 can be stably placed in the connecting groove 114 without rotation.

[0051] Please refer to Figure 4 In this embodiment, the emitting optical lens 32 includes an emitting lens body 321 and an emitting edge plate 322. The emitting edge plate 322 is integrally formed and connected to the circumferential side of the emitting lens body 321. The emitting edge plate 322 has an arc-shaped structure. The isolation member 34 includes an emitting mating plate 341. The emitting mating plate 341 has an arc-shaped structure. The emitting mating plate 341 and the emitting edge plate 322 are mated to form an annular structure surrounding the emitting lens body 321.

[0052] The receiving optical lens 33 includes a receiving lens body 331 and a receiving edge plate 332. The receiving edge plate 332 is integrally formed and connected to the circumferential side of the receiving lens body 331. The receiving edge plate 332 has an arc-shaped structure. The isolation member 34 includes a receiving mating plate 342. The receiving mating plate 342 has an arc-shaped structure. The receiving mating plate 342 and the receiving edge plate 332 are mated to form an annular structure surrounding the receiving lens body 331.

[0053] Both the transmitting edge plate 322 and the receiving edge plate 332 are non-enclosed annular structures, which provides more space for the placement of the isolator 34, allowing for a larger and stronger isolator 34 to be placed within a limited space. The connection structure of the transmitting optical lens 32, the receiving optical lens 33, and the isolator 34 is compact, small in size, and the overall structure is very stable.

[0054] In this embodiment, the emitting optical lens 32 and the receiving optical lens 33 are made of polymethyl methacrylate (PMMA) with a refractive index of 1.49. PMMA is also known as acrylic or plexiglass, and is an important plastic polymer material that was developed relatively early. It has good transparency, chemical stability and weather resistance.

[0055] The frosted surface treatment of the transmitting edge plate 322 and the receiving edge plate 332 results in poor light transmittance. This improves the forming accuracy of the intermediate transmitting lens body 321 and receiving lens body 331.

[0056] The structural principle of this invention is as follows: When manufacturing the optical collimating lens structure 3, the emitting optical lens 32 and the receiving optical lens 33 are first manufactured. Then, the emitting optical lens 32 and the receiving optical lens 33 are placed in a mold and injection molded to form a fixing module 31 and an isolator 34, enabling the emitting optical lens 32, the receiving optical lens 33, the fixing module 31, and the isolator 34 to be connected as a single unit. Finally, the TOF chip 23 is fixed within the fixing cavity 311 of the fixing module 31.

[0057] Then, the encapsulation cover 4 is installed into the connecting groove 114, the optical collimating lens structure 3 is fitted into the encapsulation cover 4, the TOF chip 23 is aligned with the fixing cavity 311, and screws are threaded through the circuit board 21 and connected to the connecting post 116. In this way, the optical collimating lens structure 3 and the encapsulation cover 4 are clamped between the circuit board 21 and the connecting groove 114. Finally, the bottom cover 12 is encapsulated and connected to the mounting opening of the main housing 11.

[0058] The laser emitted by the TOF chip 23 passes through the first emitting aperture 312 and the emitting optical lens 32. After external reflection, the returning laser passes through the receiving optical lens 33 and the first receiving aperture 313 and is received by the TOF chip 1. The TOF chip 23 calculates the distance between the target object and the device based on the time difference between the laser emission and reception.

[0059] The laser ranging device of this preferred embodiment fixes the TOF chip in the fixed cavity of the fixed module. The first emitting light-passing hole and the emitting optical lens form a laser emitting optical path, and the first receiving light-passing hole and the receiving optical lens form a laser receiving optical path. It adopts a dual optical path system, which reduces optical path interference and improves measurement accuracy. At the same time, only an isolation component is set between the emitting optical lens and the receiving optical lens. The structure is compact, stable and small in size, which is suitable for the miniaturization and integration needs of modern equipment.

[0060] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A laser ranging device, characterized in that, include: The housing, the circuit assembly, and the optical collimating lens structure connected to the circuit assembly; The circuit assembly includes a circuit board, a TOF chip disposed on one side of the circuit board, and connection terminals disposed on the other side of the circuit board; The optical collimating lens structure includes a fixing module, an isolator, an emitting optical lens, and a receiving optical lens. One side of the fixing module is provided with a fixing cavity for fixing the TOF chip. A first emitting light-passing hole for the TOF chip to emit laser light and a first receiving light-passing hole for the TOF chip to receive laser light are provided through the fixing cavity. The other side of the fixing module is provided with the isolator, the emitting optical lens, and the receiving optical lens. The isolator is located between the emitting optical lens and the receiving optical lens. The emitting optical lens corresponds to the first emitting light-passing hole, and the receiving optical lens corresponds to the first receiving light-passing hole. The circuit components and the optical collimating lens structure are disposed inside the housing. The housing is provided with a socket corresponding to the connection terminal, a second emission light-passing hole corresponding to the emitting optical lens, and a second receiving light-passing hole corresponding to the receiving optical lens.

2. The laser ranging device according to claim 1, characterized in that, The outer casing includes a main casing and a bottom cover. The second transmitting light-transmitting hole and the second receiving light-transmitting hole are disposed on one side of the main casing. The side of the main casing opposite to the second transmitting light-transmitting hole is provided with a mounting opening. The bottom cover is encapsulated and connected to the mounting opening. Both ends of the bottom cover are provided with lugs protruding from the sides of the main casing, and the lugs are provided with mounting holes.

3. The laser ranging device according to claim 2, characterized in that, The insertion hole is located on one side of the main housing, and the insertion hole and the second light-emitting hole are located on adjacent sides of the main housing, respectively.

4. The laser ranging device according to claim 2, characterized in that, The insertion hole is disposed on the bottom cover, and the insertion hole is located on the side of the bottom cover opposite to the second light-emitting hole.

5. The laser ranging device according to claim 1, characterized in that, The laser ranging device further includes a casing, which is sleeved on the outer periphery of the emitting optical lens and the receiving optical lens. The casing is provided with an emitting protrusion inserted into the second emitting light-transmitting hole and a receiving protrusion inserted into the second receiving light-transmitting hole.

6. The laser ranging device according to claim 5, characterized in that, The transmitting protrusion and the receiving protrusion are either solid structures that allow light to pass through, or axially continuous structures.

7. The laser ranging device according to claim 5, characterized in that, The outer side of the housing is provided with a boss, and the inner wall of the housing is provided with a connecting groove for installing the encapsulation cover at the position corresponding to the boss. A connecting post is provided on the inner wall of the housing. A screw passes through the circuit board and is threaded to the connecting post. The optical collimating lens structure and the encapsulation cover are clamped between the circuit board and the connecting groove.

8. The laser ranging device according to claim 7, characterized in that, The inner wall of the connecting groove is provided with a positioning protrusion, and the outer side of the encapsulation cover is provided with a positioning recess corresponding to the positioning protrusion.

9. The laser ranging device according to claim 1, characterized in that, The transmitting optical lens and the receiving optical lens are isolated by an isolator; The emitting optical lens includes a emitting lens body and an emitting edge plate. The emitting edge plate is integrally formed and connected to the circumferential side of the emitting lens body. The emitting edge plate has an arc-shaped structure. The isolation member includes an emitting mating plate. The emitting mating plate has an arc-shaped structure. The emitting mating plate and the emitting edge plate are mated to form an annular structure surrounding the emitting lens body. The receiving optical lens includes a receiving lens body and a receiving edge plate. The receiving edge plate is integrally formed and connected to the circumference of the receiving lens body. The receiving edge plate has an arc-shaped structure. The isolation member includes a receiving mating plate. The receiving mating plate has an arc-shaped structure. The receiving mating plate and the receiving edge plate are mated to form an annular structure surrounding the receiving lens body.

10. The laser ranging device according to claim 9, characterized in that, The emitting optical lens and the receiving optical lens are made of polymethyl methacrylate material with a refractive index of 1.49, and the surfaces of the emitting edge plate and the receiving edge plate are frosted.

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