Dynamic focusing device and externally-hung 3D scanning expansion device

Abstract

The utility model discloses a dynamic focusing device and an external mounting type 3D scanning expansion device, which comprise a base, the base is provided with a concave lens and a convex lens which are coaxial, and the position of the concave lens can be adjusted relative to the position of the convex lens; the driving assembly is arranged on the base and used for driving the concave lens to be close to or far away from the convex lens in the axis direction, so that a focused laser beam emitted by the concave lens and emitted by the convex lens can be located at a negative defocusing position, a zero focusing position or a positive defocusing position relative to a focal plane; the 3D dynamic focusing scanning module can solve the problems that a traditional 3D dynamic focusing scanning module relates to more optical elements and mechanical structures, complexity of a system is increased, and installation, debugging and maintenance are difficult.

Description

Technical Field

[0001] The utility model relates to the technical field of laser galvanometers, and in particular to a dynamic focusing device and an external 3D scanning expansion device. Background Art

[0002] With the development of science and technology and social progress, the application field of scanning galvanometers has expanded extremely widely. At present, 2D scanning galvanometers are the most popular in the market, mainly used in two-dimensional processing fields such as plane marking and laser cutting. In addition to realizing the basic functions of 2D scanning galvanometers, 3D scanning galvanometers can also be used in curved surface laser processing, rapid prototyping (additive manufacturing), 3D projection and other fields. Therefore, the two-dimensional plane processing method of the 2D scanning galvanometer is effectively upgraded to three-dimensional processing, which can increase the 3D scanning function of the 2D scanning galvanometer and improve the utilization rate of the galvanometer products. However, since the 3D dynamic focusing scanning module involves more optical components and mechanical structures, this increases the complexity of the system, which will cause difficulties in installation, debugging and maintenance.

[0003] In view of this, the utility model proposes a dynamic focusing device and an external 3D scanning expansion device with high precision, fast response speed and convenient debugging. Utility Model Content

[0004] The utility model aims to solve the above technical problem, that is, the traditional 3D dynamic focusing scanning module involves more optical elements and mechanical structures, which increases the complexity of the system and has problems of difficulty in installation, debugging and maintenance.

[0005] In a first aspect, the utility model provides a dynamic focusing device, comprising:

[0006] A base, on which a coaxial concave lens and a convex lens are disposed, wherein the position of the concave lens is adjustable relative to the position of the convex lens;

[0007] A driving assembly is arranged on the base, and is used to drive the concave lens to approach or move away from the convex lens along the axial direction, so that the focused laser beam incident through the concave lens and emitted from the convex lens can be in a negative defocus position, a zero focus position or a positive defocus position relative to the focal plane.

[0008] The present application controls the position of the concave lens through a precise driving assembly to adjust the position of the concave lens relative to the convex lens, which can effectively reduce the addition of optical elements and mechanical structures, reduce the difficulty of assembling, debugging and maintaining the dynamic focusing device, and improve the use effect of the present application.

[0009] In the preferred technical solution of the above dynamic focusing device, a guide rail is arranged on the base, and the concave lens is slidably arranged on the guide rail by moving the lens seat. This arrangement can ensure the stability of the movement of the concave lens on the base and improve the focusing accuracy of the laser beam.

[0010] In the preferred technical solution of the above dynamic focusing device, the driving assembly includes a driving motor arranged on the base, and a transmission structure for connecting the rotating shaft end of the driving motor and the movable lens seat.

[0011] In the preferred technical solution of the above dynamic focusing device, the transmission structure includes a crank arranged at the rotating shaft end of the driving motor and a transmission steel belt connected to the crank, wherein the transmission steel belt is connected to the movable lens seat.

[0012] In the preferred technical solution of the above dynamic focusing device, the transmission structure includes a first rocker arm arranged on the driving motor, and a second rocker arm rotationally connected to the first rocker arm and the movable lens holder.

[0013] In the preferred technical solution of the above-mentioned dynamic focusing device, a first fixed lens seat is arranged on the side of the base, the first fixed lens seat forms a heat dissipation structure, and the first fixed lens seat is arranged with an extended lens barrel on the side away from the base, and the convex lens is located in the extended lens barrel.

[0014] In the preferred technical solution of the above dynamic focusing device, a second fixed lens seat is arranged on the side of the base, the second fixed lens seat is formed with a heat dissipation structure, and the convex lens is located in the second fixed lens seat.

[0015] In the preferred technical solution of the above dynamic focusing device, the heat dissipation structure is a heat dissipation fin.

[0016] In a second aspect, the utility model also provides an external 3D scanning expansion device, which includes the above-mentioned dynamic focusing device, and also includes a two-dimensional scanning module arranged on the base near the side of the convex lens, and the two-dimensional scanning module is used to horizontally receive the focused laser beam emitted through the convex lens, and can refract the focused laser beam so that: the refracted focused laser beam is emitted vertically from below the two-dimensional scanning module.

[0017] In the preferred technical solution of the above-mentioned external 3D scanning expansion device, the two-dimensional scanning module at least includes a cover body formed with an incident light hole and an exit light hole, an X-axis galvanometer and a Y-axis galvanometer arranged on the cover body and used to refract the focused laser beam incident through the incident light hole, wherein the incident light hole is arranged coaxially with the convex lens.

[0018] The beneficial effect of the utility model is that the position of the concave lens is regulated by a precise driving component to adjust the position of the concave lens relative to the convex lens, thereby changing the focusing position of the laser beam. Through this setting, the addition of optical elements and mechanical structures can be effectively reduced, the difficulty of assembling, debugging and maintaining the dynamic focusing device can be reduced, and the use effect of the present application can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a first embodiment of an external 3D scanning expansion device;

[0020] Figure 2 This is a schematic diagram of the upper shell and the lower shell after being separated in the first embodiment;

[0021] Figure 3 is a schematic diagram of the interior of the upper housing;

[0022] Figure 4 This is a schematic diagram of the embodiment 1 after the outer shell is removed;

[0023] Figure 5 is a first schematic diagram of a transmission structure;

[0024] Figure 6 is the position relationship diagram of the concave lens and the convex lens;

[0025] Figure 7 is a schematic diagram of a first embodiment of a dynamic focusing device and a two-dimensional scanning module;

[0026] Figure 8 It is a schematic diagram of a second embodiment of the external 3D scanning expansion device;

[0027] Fig. 9 This is a schematic diagram of the second embodiment after the outer shell is removed;

[0028] Fig.10 is a second schematic diagram of the transmission structure;

[0029] Fig.11 is a schematic diagram of a second embodiment of a dynamic focusing device and a two-dimensional scanning module;

[0030] Fig.12 Schematic diagram of adjusting the focal length of a concave lens and a convex lens;

[0031] In the figure: base 1, concave lens 2, convex lens 3, laser beam 4, shell 5, DB15 XY2-100 communication interface 6, DB9 power supply interface 7, 3D DA board 8, DB25 connector 9, guide rail 10, movable lens seat 11, drive motor 12, crank 13, transmission steel belt 14, first fixed lens seat 15, heat dissipation structure 16, extended lens barrel 17, first rocker 18, second rocker 19, second fixed lens seat 20, two-dimensional scanning module 21, cover 22, X-axis galvanometer 23, Y-axis galvanometer 24. DETAILED DESCRIPTION

[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0033] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "disposed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] like Figures 1 to 12 As shown, the dynamic focusing device of the utility model has embodiment 1 and embodiment 2.

[0036] Embodiment 1:

[0037] See also Figures 1 to 7 The utility model provides a dynamic focusing device, comprising: a base 1, on which a coaxial concave lens 2 and a convex lens 3 are arranged, wherein the position of the concave lens 2 is adjustable relative to the position of the convex lens 3; a driving component, which is arranged on the base 1 and is used to drive the concave lens 2 to approach or move away from the convex lens 3 along the axial direction, so that: a focused laser beam 4 injected through the concave lens 2 and emitted from the convex lens 3 can be in a negative defocus position, a zero focus position or a positive defocus position relative to a focal plane.

[0038] See also Figure 1 , Figure 2 , Figure 3 , the base 1 is provided with a housing 5, the housing 5 includes a detachable upper housing and a lower housing, the lower housing is provided with a laser beam inlet and a laser beam outlet coaxial with the concave lens 2 and the convex lens 3; wherein, the base 1 is located in the lower housing, the driving assembly is located in the housing 5, a DB15 XY2-100 communication interface 6 and a DB9 power supply interface 7 are provided on one side surface of the upper housing, a 3D DA board 8 is provided on the inner top surface of the upper housing, and a DB25 connector 9 is provided on the inner side surface of the upper housing. When the upper housing and the lower housing are assembled, a sealed protection can be formed for the driving assembly, the concave lens 2 and the convex lens 3, thereby ensuring the use environment of the optical components to a large extent, and improving the service life of the product and the stability of the product performance.

[0039] It should be noted that the DB15 XY2-100 communication interface 6 and the DB9 power supply interface 7 are connected to the 3D DA board 8, one end of the DB25 connector 9 is connected to the 3D DA board 8, and the other end is used to connect to the two-dimensional scanning module 21. The external power supply system is connected to the 3D DA board 8 via the DB9 power supply interface 7, processed by the 3D DA board 8, and then output to the drive component and the two-dimensional scanning module 21 respectively; the host computer communication signal is connected to the 3D DA board 8 via the DB15 XY2-100 communication interface 6, processed by the 3D DA board 8, and then output to the drive component and the two-dimensional scanning module 21 respectively.

[0040] See also Fig.12 , the initial beam diameter θ of the laser beam 4, the beam diameter θ' after passing through the convex lens 3, the incident light hole diameter of the two-dimensional scanning module 21 determines the maximum value of the beam diameter θ' after passing through the convex lens 3, therefore, the optical combination beam expansion ratio k of the concave lens 2 and the convex lens 3 needs to be less than the ratio of θ' / θ.

[0041] See also Fig.12 , the focal length of the concave lens 2 is α, the focal length of the convex lens 3 is β, the spacing between the concave lens 2 and the convex lens 3 is γ, and the optical combination beam expansion ratio k of the concave lens 2 and the convex lens 3 is k=β / α. Different beam expansion ratios k can be obtained by selecting different combinations of the concave lens 2 and the convex lens 3. It should be noted that the models of the concave lens 2 and the convex lens 3 are not specifically limited and need to be selected according to production needs.

[0042] See also Figure 7 , Fig.12 The concave lens 2 is controlled by the driving component to move toward the side of the convex lens 3, so that when the distance between the concave lens 2 and the convex lens 3 is γ<β-α, the focus of the focused laser beam 4 moves downward to achieve a negative defocus position of the focal plane (the focus is below the focal plane).

[0043] See also Figure 7 , Fig.12The position of the concave lens 2 is adjusted by the driving assembly so that when the spacing between the concave lens 2 and the convex lens 3 is γ=β-α, the focus of the focused laser beam 4 is located at the zero focus position of the focal plane (the focus coincides with the focal plane).

[0044] See also Figure 7 , Fig.12 The concave lens 2 is controlled by the driving component to move away from the convex lens 3 so that when the distance between the concave lens 2 and the convex lens 3 is γ>β-α, the focus of the focused laser beam 4 moves upward to achieve a positive defocus position of the focal plane (the focus is above the focal plane).

[0045] The present application controls the position of the concave lens 2 through a precise driving assembly to adjust the position of the concave lens 2 relative to the convex lens 3, which can effectively reduce the addition of optical elements and mechanical structures, reduce the difficulty of assembling, debugging and maintaining the dynamic focusing device, and improve the use effect of the present application.

[0046] In one or more embodiments, a guide rail 10 is disposed on the base 1 , and the concave lens 2 is slidably disposed on the guide rail 10 by moving the lens holder 11 .

[0047] See also Figure 4 , Figure 5 The movable lens seat 11 can fix the concave lens 2. The movable lens seat 11 and the guide rail 10 are in a sliding connection relationship. The driving component can change the position of the concave lens 2 relative to the convex lens 3 by controlling the movement of the movable lens seat 11. Through this arrangement, the stability of the movement of the concave lens 2 on the base 1 can be guaranteed, and the focusing accuracy of the laser beam 4 can be improved.

[0048] In other possible implementations, the guide rail 10 disposed on the base 1 can be replaced by a combined cross roller.

[0049] In one or more embodiments, the driving assembly includes a driving motor 12 disposed on the base 1 , and a transmission structure for connecting a rotating shaft end of the driving motor 12 and the movable lens holder 11 .

[0050] See also Figure 4 The driving motor 12 is a high-speed and high-precision motor. The driving motor 12 is connected to the movable lens holder 11 through a transmission structure. By controlling the rotating shaft of the driving motor 12 to rotate clockwise or counterclockwise, the transmission structure drives the movable lens holder 11 to move on the guide rail 10, thereby realizing the focal length adjustment of the laser beam 4 emitted by the convex lens 3. The operation is convenient and the adjustment accuracy is high.

[0051] In one or more embodiments, the transmission structure includes a crank 13 disposed at the end of the rotating shaft of the driving motor 12 and a transmission steel belt 14 connected to the crank 13 , wherein the transmission steel belt 14 is connected to the movable lens holder 11 .

[0052] See also Figure 5 The two ends of the transmission steel belt 14 are respectively arranged on the sides of the crank 13 and the movable lens seat 11. The crank 13 is driven to rotate by the driving motor 12, so that the transmission steel belt 14 rotates, and then the movable lens seat 11 is moved closer to or away from the convex lens 3 along the guide rail 10, so as to change the focal length of the laser beam 4 emitted by the convex lens 3.

[0053] In one or more embodiments, a first fixed lens seat 15 is disposed on the side of the base 1, and the first fixed lens seat 15 forms a heat dissipation structure 16. The first fixed lens seat 15 is disposed with an extended lens barrel 17 on the side away from the base 1, and the convex lens 3 is located in the extended lens barrel 17; the heat dissipation structure 16 is a heat dissipation fin.

[0054] See also Figure 6 The heat dissipation fins formed on the first fixed lens holder 15 and the extended lens barrel 17 are both made of brass. The convex lens 3 can be cooled by the combination of the first fixed lens holder 15 and the extended lens barrel 17, thereby maintaining the optical stability of the laser beam 4 passing through the convex lens 3.

[0055] Embodiment 2:

[0056] See also Figures 8 to 11 , as the second embodiment of the present utility model, the components identical or corresponding to those in the first embodiment are marked with the corresponding reference numerals in the first embodiment, and only the differences between the second embodiment and the first embodiment are described below.

[0057] Fig. 9 Shown with Figure 4 The driving motor 12, the guide rail 10 and the movable lens seat 11 are of the same design as shown. However, the difference from the first embodiment is that: the transmission structure connecting the rotating shaft end of the driving motor 12 and the movable lens seat 11 is different; and the installation position of the convex lens 3 is different. In the second embodiment, the transmission structure is a first rocker 18 and a second rocker 19, wherein the first rocker 18 rotates synchronously with the rotating shaft end of the driving motor 12, one end of the second rocker 19 is rotatably mounted on the first rocker 18, and the other end of the second rocker 19 is rotatably mounted on the movable lens seat 11 through a micro bearing. In the second embodiment, only the transmission structure is changed, and the crank 13 and the transmission steel belt 14 connecting the rotating shaft end of the driving motor 12 and the movable lens seat 11 in the first embodiment are replaced by the first rocker 18 and the second rocker 19. In this way, the driving motor 12 drives the movable lens seat 11 to move on the guide rail 10 through the first rocker 18 and the second rocker 19 with higher accuracy, thereby improving the accuracy of the laser beam 4 emitted by the convex lens 3.

[0058] In one or more embodiments, a second fixed lens seat 20 is disposed on the side of the base 1 , and a heat dissipation structure 16 is formed on the second fixed lens seat 20 . The convex lens 3 is located in the second fixed lens seat 20 ; the heat dissipation structure 16 is a heat dissipation fin.

[0059] See also Fig.11 It should be noted that the second fixed lens holder 20 in the second embodiment has the same structural design as the first fixed lens holder 15 in the first embodiment; the second fixed lens holder 20 is used to support and fix the convex lens 3. The heat dissipation fins formed on the second fixed lens holder 20 are made of brass, and the heat dissipation of the convex lens 3 can be performed through the heat dissipation fins of the second fixed lens holder 20, thereby maintaining the optical stability of the laser beam 4 passing through the convex lens 3.

[0060] In addition, see Figure 1 , Figure 2 , Figure 7 , Fig. 9 , Fig.11 The utility model also provides an external 3D scanning expansion device, which has the dynamic focusing device in any of the above-mentioned embodiments, and also includes a two-dimensional scanning module 21 configured on the base 1 near the side of the convex lens 3. The two-dimensional scanning module 21 is used to horizontally receive the focused laser beam 4 emitted through the convex lens 3, and can refract the focused laser beam 4 so that: the refracted focused laser beam 4 is vertically emitted from the bottom of the two-dimensional scanning module 21.

[0061] See also Figure 1 , Figure 8 , the two-dimensional scanning module 21 is connected to the housing 5 of the dynamic focusing device, so that after the laser beam 4 enters the housing 5 through the laser beam entrance, it is adjusted by the concave lens 2 and the convex lens 3 to adjust the focal length of the laser beam 4, so that it is emitted through the laser beam outlet to horizontally enter the two-dimensional scanning module 21, and the laser beam 4 can be optically refracted twice in the two-dimensional scanning module 21, and then vertically emitted from the bottom of the two-dimensional scanning module 21 to form a focused laser beam 4 and focus on the focal plane. The two-dimensional scanning module 21 controls the trajectory change of the focused laser beam 4 on the horizontal plane of space, and the concave lens 2 in the dynamic focusing device moves back and forth to control the change of the focus of the focused laser beam 4 in the vertical direction of space. The combination of the two forms the vector change of the focused laser beam 4 in three-dimensional space, effectively improves the spot focusing effect, realizes dynamic scanning processing in three-dimensional space, and has practicality.

[0062] In one or more embodiments, the two-dimensional scanning module 21 includes at least a cover body 22 formed with an incident light hole and an exit light hole, an X-axis galvanometer 23 and a Y-axis galvanometer 24 arranged on the cover body 22 and used to refract the focused laser beam 4 incident through the incident light hole, wherein the incident light hole is arranged coaxially with the convex lens 3.

[0063] See also Figure 7 , Fig.11 The cover body 22 has an incident light hole that is coaxial with the laser beam entrance and laser beam exit of the shell 5, and the cover body 22 has an exit light hole that is perpendicular to the incident light hole. The X-axis galvanometer 23 and the Y-axis galvanometer 24 are arranged in the cover body 22, and the X-axis galvanometer 23 is driven by the X-axis galvanometer motor, and the Y-axis galvanometer 24 is driven by the Y-axis galvanometer motor, so that the laser beam 4 entering the cover body 22 can be optically refracted twice and then emitted on the focal plane through the exit light hole.

[0064] In other possible implementations, the cover 22 is configured with a field lens at the light exit hole.

[0065] The above implementation modes are only for illustrating the technical concept and features of the utility model, and their purpose is to allow people familiar with this technology to understand the content of the utility model and implement it. It cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A dynamic focusing device, characterized in that: include: A base, on which a coaxial concave lens and a convex lens are disposed, wherein the position of the concave lens is adjustable relative to the position of the convex lens; A driving assembly is arranged on the base, and is used to drive the concave lens to approach or move away from the convex lens along the axial direction, so that the focused laser beam incident through the concave lens and emitted from the convex lens can be in a negative defocus position, a zero focus position or a positive defocus position relative to the focal plane.

2. The dynamic focusing device according to claim 1, characterized in that: The base is provided with a guide rail, and the concave lens is slidably arranged on the guide rail by moving the lens seat.

3. The dynamic focusing device according to claim 2, characterized in that: The driving assembly comprises a driving motor arranged on the base, and a transmission structure for connecting the rotating shaft end of the driving motor and the movable lens seat.

4. The dynamic focusing device according to claim 3, characterized in that: The transmission structure comprises a crank disposed at the end of the rotating shaft of the driving motor and a transmission steel belt connected to the crank, wherein the transmission steel belt is connected to the movable lens seat.

5. The dynamic focusing device according to claim 3, characterized in that: The transmission structure includes a first rocker disposed on the driving motor and a second rocker rotatably connected to the first rocker and the movable lens seat.

6. The dynamic focusing device according to claim 4, characterized in that: A first fixed lens seat is disposed on the side of the base, the first fixed lens seat is formed with a heat dissipation structure, and an extended lens barrel is disposed on the side of the first fixed lens seat away from the base, and the convex lens is located in the extended lens barrel.

7. The dynamic focusing device according to claim 5, characterized in that: A second fixed lens seat is disposed on the side of the base, the second fixed lens seat is formed with a heat dissipation structure, and the convex lens is located in the second fixed lens seat.

8. The dynamic focusing device according to claim 6 or 7, characterized in that: The heat dissipation structure is a heat dissipation fin.

9. An external 3D scanning expansion device, characterized in that: The dynamic focusing device comprises the dynamic focusing device as described in any one of claims 1 to 8, and further comprises a two-dimensional scanning module arranged on the base near the side of the convex lens, wherein the two-dimensional scanning module is used to horizontally receive the focused laser beam emitted through the convex lens and can refract the focused laser beam so that: the refracted focused laser beam is emitted vertically from below the two-dimensional scanning module.

10. The external 3D scanning expansion device according to claim 9, characterized in that: The two-dimensional scanning module at least includes a cover body formed with an incident light hole and an exit light hole, an X-axis galvanometer and a Y-axis galvanometer arranged on the cover body and used to refract the focused laser beam injected through the incident light hole, wherein the incident light hole is coaxially arranged with the convex lens.

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