Laser focusing device driven by linear motor

Abstract

The utility model provides a laser focusing device driven by a linear motor, which relates to the technical field of optical equipment and comprises a bracket assembly, a linear motor assembly and a lens assembly. The support assembly comprises a base, a pair of side plates are vertically installed on the base, grooves are formed in the opposite faces of the side plates in the vertical direction, and a guide plate is horizontally installed between the side plates. The linear motor assembly comprises a rectangular coil assembly and a pair of magnets, the coil assembly is arranged on the outer side of the guide plate in a sleeving mode, the left side and the right side of the coil assembly are limited to move in the two grooves respectively, and the magnets are installed at the bottoms of the two grooves respectively. The bottom of the coil assembly is fixedly connected with the lens assembly, and the upper part of the lens assembly is slidably connected to the guide plate. The laser focusing device driven by the linear motor is simple and compact in structure and good in dynamic response performance, and the manufacturing cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical equipment technical field especially relates to a linear motor drive's laser focusing device. BACKGROUND

[0002] In three -dimensional scanning and curved surface laser engraving etc. Application scene, need real -time adjustment laser beam focal point position, through the automatic focusing device that lens assembly and drive assembly constitute can realize this function. However, the current automatic focusing device mainly by servo motor plus lead screw or belt constitutes drive assembly, and lens assembly is connected with corresponding slider can move along the light path back and forth linearly, to realize focusing function. The dynamic response performance of this focusing device is poor, the overall structure weight and volume are bigger, and the cost is higher. UTILITARIAN CONTENT

[0003] In order to solve the above technical problem, the utility model aims at providing a kind of laser focusing device with simple structure and good dynamic response performance.

[0004] To achieve the above object, the utility model provides a kind of linear motor drive's laser focusing device, include: support assembly, linear motor assembly and lens assembly.

[0005] Support assembly includes base, a pair of side plates are vertically installed on base, and the opposite side of side plate is all provided with recess along vertical direction, and guiding plate is horizontally installed between side plate.

[0006] Linear motor assembly includes rectangular coil assembly and a pair of magnet, coil assembly is set outside guiding plate, and the left and right sides of coil assembly are respectively limited to move in two recesses, and magnet is respectively installed at the bottom of two recesses.

[0007] The bottom of coil assembly is fixedly connected with lens assembly, and the upper portion of lens assembly is slidably connected on guiding plate.

[0008] Further, a pair of magnetic conductive plates are further passed through in coil assembly, and two magnetic conductive plates are respectively installed on two recesses, to limit the side of coil assembly in recess;Guiding plate is installed between two magnetic conductive plates.

[0009] Further, guide rail is installed at the bottom of guiding plate along focusing direction, and the top end of lens assembly is provided with sliding slot matched with guide rail.

[0010] Further, guiding plate is installed in the middle of two magnetic conductive plates.

[0011] Further, the height of magnet is greater than or equal to the height of coil assembly, and the width of magnet is greater than or equal to the width of coil assembly and the stroke of coil assembly.

[0012] Further, the coil assembly comprises a coil support and a coil body, the coil body is sleeved outside the coil support, the coil support has a preset width, and a wire slot is formed on the outer side of the coil support, and the wire slot is used for mounting the coil body.

[0013] Further, the bottom of the coil support is provided with a first side lug, and the first side lug is connected with the lens assembly.

[0014] Further, the top of the coil support is provided with a second side lug, and the transmitting end of the wire displacement sensor is mounted on the second side lug.

[0015] Further, the control module is fixedly installed on the top of the two side plates through a mounting plate.

[0016] Further, the control module is electrically connected with the linear motor assembly, the lens assembly and the wire displacement sensor through a wire harness.

[0017] The beneficial effects of the present application are that the linear motor is directly embedded in the support assembly, the overall volume is reduced, and the cost and structure weight are further reduced. The coil assembly is directly connected with the lens assembly, and the lens assembly is installed at the center position of the coil assembly, the coil assembly directly drives the lens assembly to move, and the response speed of the lens assembly and the motion stability of the lens assembly are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structure schematic view of the laser focusing device driven by the linear motor in the embodiment of the present application;

[0019] Figure 2 It is a structure schematic view of the support assembly in the embodiment of the present application;

[0020] Figure 3 It is a semi-sectional view of the laser focusing device driven by the linear motor in the embodiment of the present application;

[0021] Figure 4 It is a structure schematic view of the coil assembly in the embodiment of the present application;

[0022] Figure 5 It is an installation schematic view of the control module in the embodiment of the present application.

[0023] In the drawings, 1 is a support assembly; 2 is a lens assembly; 3 is a guide plate; 4 is a coil assembly; 5 is a magnet; 6 is a magnetic guide plate; 7 is a wire displacement sensor; 8 is a control module; 9 is a mounting plate; 11 is a base; 12 is a side plate; 13 is a groove; 31 is a guide rail; 21 is a sliding groove; 41 is a coil support; 42 is a coil body; 43 is a first side lug; 44 is a second side lug; 71 is a transmitting end; and 72 is a receiving end. Detailed Implementation

[0024] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0025] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly. The connection can be a direct connection or an indirect connection.

[0027] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0028] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] like Figure 1 The diagram shown is a structural schematic of the laser focusing device driven by a linear motor in this embodiment. The laser focusing device driven by a linear motor provided in this embodiment includes: a support assembly 1, a linear motor assembly, and a lens assembly 2.

[0030] Wherein, the support assembly 1 in the embodiment not only serves as the support of the whole focusing device, but also combines with the linear motor assembly to form a complete linear motor, so that the lens assembly 2 can be driven by the linear motor to move back and forth along the focusing light path. The linear motor includes a mover structure and a stator structure, the mover structure is connected with the lens assembly 2, and the stator structure is fixedly installed on the support assembly 1. In the embodiment, the lens assembly 2 is directly driven by the linear motor, and linear movement of the lens can be completed by inputting corresponding signals, thereby directly adjusting the focal point position of the laser beam, without the need for a complex conversion mechanism to convert general rotary motion into linear motion. Compared with the prior art, the embodiment can reduce the complexity of the system structure, has faster response, higher stability, lower weight, smaller size and lower cost.

[0031] As shown in Figure 2 , it is a structural schematic diagram of the support assembly in the embodiment, the support assembly 1 includes a base 11, a pair of side plates 12 are vertically installed on the base 11, and grooves 13 are formed on the opposite sides of the side plates 12 in the vertical direction, and a guide plate 3 is horizontally installed between the side plates 12.

[0032] Wherein, the surface of the base 11 and the opposite sides of the side plates 12 are parallel to the focusing direction, forming a groove-shaped structure, and the guide plate 3 is used for guiding the lens assembly 2, so that the lens assembly 2 can move along the focusing direction. The grooves 13 formed on the side plates 12 are used for installing the stator structure, and the mover structure of the linear motor assembly moves in the grooves 13, and the grooves 13 have a predetermined width.

[0033] The linear motor assembly includes a rectangular coil assembly 4 and a pair of magnets 5, the coil assembly 4 is sleeved outside the guide plate 3, and the left and right sides of the coil assembly 4 are respectively limited to move in the two grooves 13, and the magnets 5 are respectively installed at the bottoms of the two grooves 13.

[0034] Wherein, the depth of the groove 13 is greater than the thickness of the magnet 5, and there is still space in the groove 13 to accommodate the coil assembly 4 after the magnet 5 is installed, and the guide plate 3 can be directly installed between the two side plates 12 to limit the movement of the coil assembly 4 in the groove 13. The linear motor and the support are combined together in the embodiment, which can reduce the overall volume, make it more convenient to control the lens, and improve the precision of laser focusing.

[0035] The bottom of the coil assembly 4 is fixedly connected with the lens assembly 2, and the upper part of the lens assembly 2 is slidably connected to the guide plate 3.

[0036] Wherein, the upper end of the lens assembly 2 is slidably installed on the guide plate 3, and the bottom is connected with the coil assembly 4, and the position is located at the middle part of the coil assembly 4, which can reduce the overall volume. Fixing the upper and lower ends of the lens assembly 2 can improve the movement stability of the lens assembly 2 and improve the focusing precision.

[0037] The linear motor is directly embedded in the support assembly 1, reducing the overall volume, and further reducing the cost and structural weight. The coil assembly 4 is directly connected to the lens assembly 2, and the lens assembly 2 is installed at the center of the coil assembly 4. The coil assembly 4 directly drives the lens assembly 2 to move, improving the response speed of the lens assembly 2 and the stability of the lens assembly 2.

[0038] As shown in Figure 3 The linear motor driven laser focusing device in this embodiment is shown in the half sectional view. In this embodiment, a pair of magnetic guide plates 6 passes through the middle of the coil assembly 4. The two magnetic guide plates 6 are installed across the two grooves 13 respectively, limiting the side of the coil assembly 4 in the groove 13; the guide plate 3 is installed between the two magnetic guide plates 6.

[0039] The magnetic guide plate 6 is plate-shaped, which can cover the opening of the groove 13, further improving the position stability of the side of the coil assembly 4 in the groove 13, and reducing the possibility of coil assembly 4 shaking. The magnetic guide plate 6 can effectively absorb and guide the magnetic induction lines, enhance the magnetic field strength, reduce the loss and temperature rise. The guide plate 3 can be fixedly installed between the two magnetic guide plates 6 by bolts, which can support the two magnetic guide plates 6.

[0040] As shown in Figure 3 In this embodiment, the guide plate 3 is installed with a guide rail 31 at the bottom along the focusing direction, and the lens assembly 2 is provided with a sliding groove 21 matched with the guide rail 31.

[0041] The cooperation of the guide rail 31 and the sliding groove 21 can make the lens assembly 2 move along the focusing direction, preventing the lens assembly 2 from shaking. Preferably, the guide rail 31 and the sliding groove 21 can be respectively installed at the bottom of the guide plate 3 and the top of the lens assembly 2 by fixing members.

[0042] In this embodiment, the guide plate 3 is installed in the middle of the two magnetic guide plates 6.

[0043] The guide plate 3 can be installed between the two magnetic guide plates 6 by screws. In the vertical direction, the installation position of the guide plate 3 is preferably close to the middle of the magnetic guide plate 6, and the two sides of the guide plate 3 respectively abut against the two magnetic guide plates 6, improving the installation stability of the guide plate 3. The weight distribution of the whole moving part is more balanced, and the operation is more stable at high response speed.

[0044] In this embodiment, the height of the magnet 5 is greater than or equal to the height of the coil assembly 4, and the width of the magnet 5 is greater than or equal to the sum of the width of the coil assembly 4 and the stroke of the coil assembly 4.

[0045] The size of the magnet 5 can ensure that the coil assembly 4 is always placed in a uniform magnetic field, so that the lens assembly 2 and the coil assembly 4 operate more smoothly. The size of the groove 13 on the side plate 12 can be determined according to the magnet 5, and the magnet 5 can be embedded in the bottom surface of the groove 13 for positioning and installation. The stroke of the coil assembly 4 is the maximum distance that the coil assembly 4 can move in the groove 13, that is, the maximum distance that the lens assembly 2 can move in the focusing direction.

[0046] As shown in Figure 4 , it is a structural schematic diagram of the coil assembly in the embodiment. In the embodiment, the coil assembly 4 includes a coil support 41 and a coil body 42, the coil body 42 is sleeved outside the coil support 41, the coil support 41 has a predetermined width, and a wire slot is formed on the outer side surface of the coil support 41, which is used for installing the coil body 42.

[0047] The coil support 41 can be made of lightweight plastic with fiber, which can not only ensure the strength and rigidity, but also reduce the weight of the moving part and improve the response performance of the system. The wire slot formed on the outer side surface of the coil support 41 can facilitate the winding of the enameled wire and prevent it from falling off. The width of the coil support 41 can be determined according to the coil body 42.

[0048] As shown in Figure 4 , in the embodiment, the bottom of the coil support 41 is provided with a first side ear 43, and the first side ear 43 is connected with the lens assembly 2.

[0049] The screw hole can be formed on the first side ear 43 of the coil support 41, which is convenient for connecting with the lens assembly 2 and will not affect the coil body 42.

[0050] As shown in Figure 3 and Figure 4 , in the embodiment, a wire displacement sensor 7 is further included, the top of the coil support 41 is provided with a second side ear 44, the transmitting end 71 of the wire displacement sensor 7 is installed on the second side ear 44, and the receiving end 72 of the wire displacement sensor 7 is installed on the top of the guide plate 3.

[0051] The wire displacement sensor 7 is used for detecting the position of the moving part in the focusing device, realizing real-time adjustment of the focal length of the laser beam, and improving the focusing precision.

[0052] As shown in Figure 5 , it is an installation schematic diagram of the control module in the embodiment. In the embodiment, a control module 8 is further included, and the control module 8 is fixedly installed on the top of the two side plates 12 through an installation plate 9.

[0053] The mounting plate 9 can be fixed on the two side plates 12 by bolts, and the side plates 12 are stabilized, and the rigidity of the overall structure is improved. The control module 8 is fixed on the mounting plate 9, and is close to the linear motor assembly, so that the complexity of circuit connection is reduced, and the linear motor assembly is controlled conveniently. Preferably, the embodiment further comprises a shell, the shell can protect the internal structure of the laser focusing device, and a light shield can be installed on the shell to shield light for the lens assembly.

[0054] In the embodiment, the control module 8 is electrically connected with the linear motor assembly, the lens assembly 2 and the linear displacement sensor 7 through a wire harness.

[0055] The linear displacement sensor 7 detects the position of the lens assembly 2 in real time, and then transmits the position information of the lens assembly 2 to the control module 8. The control module 8 outputs corresponding alternating current to the linear motor assembly according to the focusing requirement, drives the linear motor assembly to reach the target position, and realizes real-time adjustment of the focal length of the laser beam.

[0056] The above only describes the preferred embodiments of the utility model, and does not limit the patent range of the utility model, and equivalent structures or equivalent process transformations in the content of the utility model specification and drawings, or direct or indirect application in other related technical fields are all included in the patent protection range of the utility model.

Claims

1. A laser focusing device driven by a linear motor, characterized in that, include: Support assembly (1), linear motor assembly and lens assembly (2); The bracket assembly (1) includes a base (11), on which a pair of side plates (12) are vertically mounted. Each of the opposite sides of the side plates (12) has a groove (13) in the vertical direction. A guide plate (3) is horizontally mounted between the side plates (12). The linear motor assembly includes a rectangular coil assembly (4) and a pair of magnets (5). The coil assembly (4) is sleeved on the outside of the guide plate (3), and the left and right sides of the coil assembly (4) are respectively restricted to move in the two grooves (13). The magnets (5) are respectively installed at the bottom of the two grooves (13). The bottom of the coil assembly (4) is fixedly connected to the lens assembly (2), and the upper part of the lens assembly (2) is slidably connected to the guide plate (3).

2. The linear motor-driven laser focusing device according to claim 1, characterized in that, A pair of magnetic plates (6) also pass through the middle of the coil assembly (4). The two magnetic plates (6) are respectively mounted across the two grooves (13) to restrict the sides of the coil assembly (4) in the grooves (13); the guide plate (3) is installed between the two magnetic plates (6).

3. The linear motor-driven laser focusing device according to claim 2, characterized in that, The bottom of the guide plate (3) is equipped with a guide rail (31) along the focusing direction, and the top of the lens assembly (2) is provided with a sliding groove (21) that cooperates with the guide rail (31).

4. The linear motor-driven laser focusing device according to claim 3, characterized in that, The guide plate (3) is installed in the middle of the two magnetic plates (6).

5. The linear motor-driven laser focusing device according to claim 1, characterized in that, The height of the magnet (5) is greater than or equal to the height of the coil assembly (4), and the width of the magnet (5) is greater than or equal to the sum of the width of the coil assembly (4) and the stroke of the coil assembly (4).

6. The linear motor-driven laser focusing device according to claim 1, characterized in that, The coil assembly (4) includes a coil bracket (41) and a coil body (42). The coil body (42) is sleeved on the outside of the coil bracket (41). The coil bracket (41) has a preset width and a wire groove is opened on the outer surface of the coil bracket (41). The wire groove is used to fix the coil body (42).

7. The linear motor-driven laser focusing device according to claim 6, characterized in that, The bottom of the coil bracket (41) is provided with a first side ear (43), which is connected to the lens assembly (2).

8. The linear motor-driven laser focusing device according to claim 6, characterized in that, It also includes a linear displacement sensor (7), a second side ear (44) is provided on the top of the coil bracket (41), the transmitting end (71) of the linear displacement sensor (7) is mounted on the second side ear (44), and the receiving end (72) of the linear displacement sensor (7) is mounted on the top of the guide plate (3).

9. The linear motor-driven laser focusing device according to claim 8, characterized in that, It also includes a control module (8), which is fixedly mounted on the top of the two side plates (12) by a mounting plate (9).

10. The linear motor-driven laser focusing device according to claim 9, characterized in that, The control module (8) is electrically connected to the linear motor assembly, the lens assembly (2) and the linear displacement sensor (7) via a wiring harness.

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