Focusing adjusting structure and laser coding machine
By using a focus adjustment structure with the mounting base connected to the ball hinge of the light emitter in the laser coder, the problem of misalignment of the light emitter in the prior art is solved, and the accurate focus of the focus and the printing effect are improved.
Patent Information
- Application Number
- CN202422237916.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-09-12
AI Technical Summary
In the prior art, the processing and installation accuracy requirements of the cylinder are high, resulting in the indicator light generator being easily dislocated in the axial direction and cannot gather at one point, which affects the printing effect of the laser coder.
The focus adjustment structure is adopted with the mounting base connected to the ball hinge of the light emitter. The angle of the light emitter is adjusted through the sliding and locking structure to make it converge on the focus plane, and the fixed position is combined with the locking structure to ensure accurate focus.
It realizes accurate focus of the laser coder, avoids misalignment of the light transmitter, and improves printing effect and accuracy.
Smart Images
Figure CN223235299U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser coding machines, in particular to a focus adjustment structure and a laser coding machine. Background Art
[0002] The laser beam of a laser coder is focused by a field lens. At the focal point of the field lens, the laser energy ablates text or patterns onto the surface of the item being coded. Whether the surface of the item is at the focal point of the field lens plays a crucial role in the printing effect.
[0003] In order to adjust the position of the field lens relative to the object to be coded so that the focus of the field lens is located on the surface of the object to be coded, the prior art provides a laser focusing auxiliary device, which includes a base body, a cylinder movably arranged on the base body, and an indicator light generator installed on the cylinder. The base body is fixedly connected to the field lens, and two cylinders and two indicator light generators are provided. The two indicator light generators are both used to emit indicator light (i.e., laser) to the surface of the object to be coded. If the indicator lights emitted by the two indicator light generators can converge to a point on the surface of the object to be coded, it indicates that the focus of the field lens is located on the surface of the object to be coded. If they cannot converge to a point on the surface of the object to be coded, it is necessary to adjust the distance of the field lens relative to the object to be coded so that its focus is located on the surface of the object to be coded. Since the focal positions of different types of field lenses are different, in order to adapt to different types of field lenses, the cylinder is movably installed on the base body, so that the emission angle of the indicator light of the two indicator light generators can be changed. However, the above solution has high requirements for the processing and installation accuracy of the cylinder, and it is easy for the indicator light emitted by the two indicator light generators to be misaligned along the axial direction of the cylinder and unable to converge at one point. Utility Model Content
[0004] According to one aspect of the present invention, the present invention provides a focus adjustment structure to solve the problem that the prior art has high requirements for the processing and installation precision of the cylinder, and the indicator lights emitted by the two indicator light generators are easily misaligned along the axis of the cylinder and cannot converge at one point.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A focus adjustment structure, used for adjusting the position of the device to be focused relative to the frame so that the focus of the device to be focused is located within the focus plane;
[0007] include:
[0008] A mounting base, configured to be slidably mounted on the frame and used to mount the device to be focused;
[0009] Two light emitters are provided, each of the light emitters includes a connecting portion and an emitting portion provided on the connecting portion, both of the connecting portions are connected to the mounting base with a ball joint, and both of the emitting portions are capable of emitting light; the mounting base is capable of sliding relative to the frame to approach or move away from the focal plane.
[0010] As a preferred solution of the focus adjustment structure, it further includes two locking structures, which are arranged in a one-to-one correspondence with the two light emitters, and the locking structures are used to lock or unlock the position of the corresponding light emitter relative to the mounting base.
[0011] As a preferred solution of the focus adjustment structure, the locking structure includes a pressure plate and a pressure plate locking screw. The pressure plate cooperates with the mounting base to form a ball socket for accommodating the connecting part. The pressure plate locking screw passes through the mounting base and is threadedly connected to the pressure plate.
[0012] As a preferred solution of the focus adjustment structure, the locking structure also includes a step screw, which includes a head, a step portion and a threaded portion connected in sequence, the outer diameter of the step portion is larger than the outer diameter of the threaded portion, the threaded portion is threadedly connected to the mounting base, the step portion is passed through the pressure plate, and the head is located at one end of the pressure plate away from the mounting base.
[0013] As a preferred solution of the focus adjustment structure, one of the frame and the mounting base is connected with a slider, and the other is provided with a slide groove, and the slider is slidably arranged in the slide groove.
[0014] As a preferred solution of the focus adjustment structure, the slider is arranged on the frame, the mounting base includes a base body for mounting the device to be focused and a connecting strip slidably arranged on the base body, the base body and the connecting strip together form the slide groove, and the mounting base also includes a connecting strip locking screw, which passes through one of the base body and the connecting strip and is threadedly connected to the other of the base body and the connecting strip.
[0015] As a preferred solution of the focus adjustment structure, the sliding groove is a dovetail groove.
[0016] As a preferred solution of the focus adjustment structure, the connecting strip further has a wedge-shaped guide groove, and the base body is inserted into the guide groove.
[0017] As a preferred solution of the focus adjustment structure, an adjustment member is further included, and the adjustment member is used to drive the mounting base to slide relative to the frame.
[0018] According to another aspect of the present invention, a laser coding machine is further provided, comprising the above-mentioned focus adjustment structure and a frame, wherein the mounting base is slidably arranged on the frame, the device to be focused is a field lens, and is mounted on the mounting base, the field lens is used to perform laser coding on the surface of the object to be coded, and the surface of the object to be coded is the focusing plane.
[0019] The beneficial effects of the utility model are:
[0020] The utility model provides a focus adjustment structure, which is used to adjust the position of a device to be focused relative to a frame so that the focus of the device to be focused is located within a focus plane. The focus adjustment structure includes a mounting base and a light emitter mounting base for slidingly setting on the frame and for mounting the device to be focused; two light emitters are provided, and both light emitters include a connecting portion and an emitting portion provided on the connecting portion, and both connecting portions are connected to the mounting base by a ball joint. Both emitting portions can emit light, and because the connecting portion is connected to the mounting base by a ball joint, the mounting angle of the connecting portion can be adjusted so that the two emitting portions emit light toward the focus plane; the mounting base can slide relative to the frame to approach or move away from the focus plane so that the light spots emitted by the two emitting portions on the focus plane converge at one point, thereby intersecting and matching the focal length of the device to be focused by adjusting the connecting portion. Specifically, the angles of the two light emitters relative to the mounting base can be adjusted according to actual conditions. When the light spots of the light emitted by the two emitting portions on the focus plane converge at one point, the focus of the device to be focused is located within the focus plane. When focusing, the user only needs to observe whether the light spots emitted by the emitting parts of the two light emitters converge at a point on the focusing plane to determine whether the focus of the device to be focused is within the focusing plane. If there is a distance between the light spots emitted by the two emitting parts within the focusing plane, it indicates that the focus of the device to be focused is not on the focusing plane. The larger the distance between the focus of the device to be focused and the focusing plane, the larger the distance between the light spots emitted by the two emitting parts on the focusing plane. The user can adjust the position of the mounting base relative to the frame to adjust the position of the device to be focused relative to the focusing plane. In addition, because the connecting part is connected to the mounting base by a ball joint, the installation angle of the connecting part relative to the mounting base can be adjusted according to actual needs. Compared with the existing technology, the light emitter will not be misaligned and unable to converge at a point.
[0021] The present invention also provides a laser coding machine, comprising the above-mentioned focus adjustment structure, and further comprising a frame, a mounting base slidably disposed on the frame, a device to be focused being a field lens, and mounted on the mounting base, the field lens being used to laser code the surface of an object to be coded, the surface of the object to be coded being a focus plane. In this focus adjustment structure, a user only needs to observe whether the light spots emitted by the emitting parts of the two light emitters converge at a point on the focus plane to determine whether the focus of the device to be focused is within the focus plane. In addition, since the connecting part is connected to the mounting base by a ball joint, the mounting angle of the connecting part relative to the mounting base can be adjusted according to actual needs. Compared with the prior art, the light emitter will not be misaligned and unable to converge at a point. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the structure of the laser coding machine in the embodiment of the utility model Figure 1 ;
[0023] Figure 2 This is a schematic diagram of the structure of the laser coding machine in the embodiment of the utility model Figure 2 ;
[0024] Figure 3 This is a schematic diagram of the structure of the laser coding machine in the embodiment of the utility model Figure 3 ;
[0025] Figure 4 yes Figure 3 Enlarged view of point A in the middle;
[0026] Figure 5 This is a partial structural diagram of a laser coding machine in an embodiment of the present utility model;
[0027] Figure 6 yes Figure 5 Enlarged view of point B in the middle;
[0028] Figure 7 This is a structural diagram of the mounting base in an embodiment of the present utility model;
[0029] Figure 8 It is a partial structural diagram of the mounting base in an embodiment of the utility model.
[0030] In the picture:
[0031] 100, frame; 101, slider; 102, extension plate; 200, device to be focused; 300, focusing plane;
[0032] 1. Mounting base; 11. Ball socket; 12. Slide groove; 13. Base body; 14. Connecting bar; 141. Guide groove; 15. Connecting bar locking screw;
[0033] 2. Light emitter; 21. Connecting part; 22. Transmitting part;
[0034] 3. Locking structure; 31. Pressure plate; 32. Screw;
[0035] 4. Adjusting part; 41. Circlip. DETAILED DESCRIPTION
[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.
[0037] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0038] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.
[0039] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.
[0040] In order to adjust the position of the field lens relative to the object to be coded so that the focus of the field lens is located on the surface of the object to be coded, the prior art provides a laser focusing auxiliary device, which includes a base body, a cylinder movably mounted on the base body, and an indicator light generator mounted on the cylinder. The base body is fixedly connected to the field lens, and two cylinders and two indicator light generators are provided. The two indicator light generators are each used to emit an indicator light toward the surface of the object to be coded. If the indicator light emitted by the two indicator light generators can converge to a point on the surface of the object to be coded, it indicates that the focus of the field lens is located on the surface of the object to be coded. Because different types of field lenses have different focal positions, in order to accommodate different types of field lenses, the cylinder is movably mounted on the base body, thereby enabling the emission angles of the indicator light from the two indicator light generators to be changed. However, this solution requires high machining and installation precision of the cylinder, which can easily cause the indicator light emitted by the two indicator light generators to be misaligned along the axis of the cylinder and fail to converge to a point.
[0041] In response to the above problems, this embodiment provides a focus adjustment structure to solve the problem that the existing technology has high requirements for the processing and installation precision of the cylinder, and the lasers emitted by the two indicator light generators are easily misaligned along the axis of the cylinder and cannot converge at one point. It can be used in the field of laser coding machine technology.
[0042] Reference Figures 1-8 The focus adjustment structure is used to adjust the position of the device to be focused 200 relative to the frame 100 so that the focus of the device to be focused 200 is located within the focus plane 300. In this embodiment, the device to be focused 200 is a field lens of a laser coding machine, and the focus plane 300 is the surface of the object to be coded. In other embodiments, the device to be focused 200 and the focus plane 300 can also have other structures.
[0043] Continue to refer to Figures 1-8The focus adjustment structure includes a mounting base 1 and a light emitter 2. The mounting base 1 is used to be slidably set on the frame 100 and to install the device to be focused 200. There are two light emitters 2. The two light emitters 2 include a connecting portion 21 and an emitting portion 22 provided on the connecting portion 21. The two connecting portions 21 are both connected to the mounting base 1 by a ball joint. The two emitting portions 22 can emit light. Since the connecting portion 21 is connected to the mounting base 1 by a ball joint, the mounting angle of the connecting portion 21 can be adjusted so that the two emitting portions 22 emit light toward the focus plane 300. The mounting base 1 can It can slide relative to the frame 100 to approach or move away from the focusing plane 300, so that the light spots emitted by the two emitting parts 22 on the focusing plane 300 converge at a point, so that the focal points intersect and match the focal length of the device to be focused 200 by adjusting the connecting part 21. In this embodiment, the focus adjustment structure is applied to the laser coding machine, so the angles of the two light emitters 2 can be pre-adjusted before leaving the factory or during use, so that the light spots emitted by the two emitting parts 22 on the focusing plane 300 converge at a point, and at this time the focus of the field lens is located within the focusing plane 300. Therefore, when using the laser coding machine, the user only needs to adjust the position of the field lens relative to the frame 100 up and down so that the light emitted by the two emitting parts 22 converge at a point on the surface of the object to be coded, which means that the field lens has been adjusted to the optimal position. That is to say, when the user is adjusting the focus, he only needs to slide the device to be focused 200 up and down and observe whether the light spots emitted by the emitting parts 22 of the two light emitters 2 converge at one point on the focus plane 300 to determine whether the focus of the device to be focused 200 is within the focus plane 300. Figure 2 As shown by the dotted line in . If, within the focusing plane 300, there is a distance between the light spots emitted by the two emitting units 22, this indicates that the focus of the device 200 to be focused is not on the focusing plane 300. Furthermore, the greater the distance between the focus of the device 200 to be focused and the focusing plane 300, the greater the distance between the light spots emitted by the two emitting units 22 on the focusing plane 300. The user can adjust the position of the mounting base 1 relative to the frame 100 to adjust the position of the device 200 to be focused relative to the focusing plane 300. Furthermore, because the connecting portion 21 is connected to the mounting base 1 via a ball joint, the mounting angle of the connecting portion 21 relative to the mounting base 1 can be adjusted according to actual needs. Compared to the prior art, this eliminates the problem of the light emitter 2 being misaligned and unable to converge at a single point.
[0044] Continue to refer to Figures 1-8The focus adjustment structure also includes two locking structures 3, which are arranged in a one-to-one correspondence with the two light emitters 2. The locking structures 3 are used to lock or unlock the position of the corresponding light emitter 2 relative to the mounting base 1, so that when performing a focusing operation, the positions of the two light emitters 2 relative to the mounting base 1 can be locked to avoid errors. When it is necessary to adjust the angle of the light emitter 2 relative to the mounting base 1, the two are unlocked.
[0045] Continue to refer to Figures 1-8 The locking structure 3 includes a pressure plate 31 and a pressure plate locking screw 32. The pressure plate 31 cooperates with the mounting base 1 to form a ball socket 11 for accommodating the connecting portion 21. The screw 32 passes through the mounting base 1 and is threadedly connected to the pressure plate 31. The user can tighten the pressure plate 31 to the connecting portion 21 by screwing the pressure plate locking screw 32 to keep the position of the connecting portion 21 fixed relative to the mounting base 1. In addition, the pressure plate locking screw 32 can be loosened to disengage the pressure plate 31 from the connecting portion 21, thereby unlocking the position of the connecting portion 21 relative to the mounting base 1.
[0046] Continue to refer to Figures 1-8 The locking structure 3 also includes a stepped screw 33, which comprises a head, a stepped portion, and a threaded portion, which are sequentially connected. The outer diameter of the stepped portion is larger than the outer diameter of the threaded portion. The threaded portion is threadedly connected to the mounting base 1. The stepped portion is provided through the pressure plate 31, and the head is located at the end of the pressure plate 31 away from the mounting base 1. This allows the stepped screw 33 to be stably mounted on the mounting base 1 via the threaded portion. Because the outer diameter of the stepped portion is larger than the outer diameter of the threaded portion, the stepped portion remains outside the threaded hole after the threaded portion is tightened. In this embodiment, after the pressure plate 31 and stepped screw 33 are installed, when the lower end surface of the pressure plate 31 is in contact with the mounting base 1, a certain gap remains between the upper end surface and the head of the stepped screw 33. If the pressure plate locking screw 32 is not fully tightened, the pressure plate 31 can float relative to the stepped portion and the mounting base 1. In addition, the head of the stepped screw 33 can limit the maximum movement distance of the pressure plate 31. This arrangement allows the connecting portion 21 to still rotate relative to the mounting base 1, facilitating user adjustment of the connecting portion 21. It can be understood that although the connecting part 21 can rotate relative to the mounting base 1 at this time, it will still be subject to a certain damping force, and the connecting part 21 will not rotate on its own when there is no external force. The user can also tighten the pressure plate locking screw 32 after the connecting part 21 is adjusted into place to completely lock the pressure plate 31, the connecting part 21 and the mounting base 1.
[0047] Optionally, an elastic member is provided between the head of the step screw 33 and the pressure plate 31, and the elastic member is specifically a compression spring or a spring sheet, so that the elastic member can apply an elastic force to the pressure plate 31 toward the mounting base 1 and the connecting part 21 to increase the damping force of the pressure plate 31 on the connecting part 21, thereby preventing the connecting part 21 from rotating on its own, and at the same time ensuring that the connecting part 21 can rotate under the action of external force.
[0048] Continue to refer to Figures 1-8 One of the rack 100 and the mounting base 1 is connected with a slider 101 , and the other is provided with a slide groove 12 . The slider 101 is slidably arranged in the slide groove 12 , so that the mounting base 1 can slide stably relative to the rack 100 .
[0049] In this embodiment, the slider 101 is specifically arranged on the frame 100, and the mounting base 1 opens a slide groove 12. In addition, the mounting base 1 includes a base body 13 for mounting the device 200 to be focused and a connecting bar 14 slidably arranged on the base body 13. The base body 13 and the connecting bar 14 together form the slide groove 12. The mounting base 1 also includes a connecting bar locking screw 15. The connecting bar locking screw 15 passes through one of the base body 13 and the connecting bar 14 and is threadedly connected to the other of the base body 13 and the connecting bar 14. Such a setting can adjust the position of the connecting bar 14 relative to the base body 13, which is convenient for installation. In addition, after focusing is completed, the distance between the base body 13 and the connecting bar 14 can be adjusted by screwing the connecting bar locking screw 15, so that the position of the device 200 to be focused relative to the frame 100 remains fixed.
[0050] Continue to refer to Figures 1-8 The slide groove 12 is a dovetail groove, thereby preventing the slider 101 from falling out of the slide groove 12 and improving the stability of the sliding connection.
[0051] Continue to refer to Figures 1-8 The connecting strip 14 further has a wedge-shaped guide groove 141, into which the base body 13 is inserted. This arrangement can guide the relative movement between the base body 13 and the connecting strip 14. In addition, in this embodiment, when the base body 13 and the groove wall of the wedge-shaped guide groove 141 are in close contact or there is still a certain gap, the slider 101 and the side wall of the slide groove 12 are in close contact, so that the two side walls of the slide groove 12 formed by the base body 13 and the connecting strip 14 can stably clamp the slider 101 and can also limit the maximum movement distance between the base body 13 and the connecting strip 14.
[0052] As an alternative, in order to prevent the slider 101 from falling out of the chute 12, a T-shaped slider 101 can also be used, and the chute 12 is also configured to be T-shaped. In addition, the connecting bar locking screw 15 is threaded through the side wall of the chute 12 and abuts against the slider, which can also play a locking role.
[0053] Continue to refer to Figures 1-8 The focus adjustment structure also includes an adjustment member 4, which is used to drive the mounting base 1 to slide relative to the frame 100, so that the user can adjust the position of the base 1 relative to the frame 100, thereby facilitating the user to perform focusing operations.
[0054] Specifically, the adjustment member 4 is an adjustment screw that rotatably engages with the frame 100 and is threadedly connected to the mounting base 1. The user can adjust the position of the base 1 relative to the frame 100 by rotating the adjustment screw. Furthermore, the adjustment screw cannot move axially relative to the frame 100. Specifically, the frame 100 extends an extension plate 102 in a direction close to the mounting base 1. The adjustment screw passes through the extension plate 102, and the head of the adjustment screw abuts the surface of the extension plate 102. Furthermore, the adjustment screw is provided with an annular retaining ring groove, in which a retaining ring 41 is connected. The head of the adjustment screw and the retaining ring 41 are respectively located on either side of the extension plate 102, thereby ensuring that the adjustment screw can only rotate relative to the frame 100 and preventing the adjustment screw from dislodging from the frame 100 and the extension plate 102.
[0055] As an alternative, the adjusting member 4 can also be a cylinder, the fixed end of the cylinder is fixedly set on the frame 100, and the telescopic end is fixedly set on the mounting base 1. By driving the telescopic end to reciprocate relative to the fixed end, the mounting base 1 is driven to slide relative to the frame 100.
[0056] This embodiment also provides a laser coding machine, including the above-mentioned focus adjustment structure, and also includes a frame 100, a mounting base 1 is slidably set on the frame 100, and the device 200 to be focused is a field lens, which is mounted on the mounting base 1. The field lens is used to perform laser coding on the surface of the object to be coded, and the surface of the object to be coded is the focus plane 300. In this focus adjustment structure, the user only needs to observe whether the light spots emitted by the emitting parts 22 of the two light emitters 2 converge at a point on the focus plane 300 to determine whether the focus of the device 200 to be focused is within the focus plane 300. In addition, since the connecting part 21 is connected to the mounting base 1 by a ball joint, the installation angle of the connecting part 21 relative to the mounting base 1 can be adjusted according to actual needs. Compared with the prior art, the light emitter 2 will not be misaligned and unable to converge at a point.
[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.
Claims
1. A focus adjustment structure, used for adjusting the position of the device to be focused (200) relative to the frame (100) so that the focus of the device to be focused (200) is located within the focus plane (300); It is characterized by: include: A mounting base (1) is used for being slidably arranged on the frame (100) and for mounting the device to be focused (200); Two light emitters (2) are provided, each of the two light emitters (2) comprising a connecting portion (21) and an emitting portion (22) provided on the connecting portion (21), the two connecting portions (21) being connected to the mounting base (1) by a ball joint, and the two emitting portions (22) being capable of emitting light; and the mounting base (1) being capable of sliding relative to the frame (100) to approach or move away from the focal plane (300).
2. The focus adjustment structure according to claim 1, characterized in that: It also includes two locking structures (3), which are arranged in a one-to-one correspondence with the two light emitters (2), and the locking structures (3) are used to lock or unlock the position of the corresponding light emitter (2) relative to the mounting base (1).
3. The focus adjustment structure according to claim 2, characterized in that: The locking structure (3) includes a pressure plate (31) and a pressure plate locking screw (32), wherein the pressure plate (31) cooperates with the mounting base (1) to form a ball socket (11) for accommodating the connecting portion (21), and the pressure plate locking screw (32) is passed through the mounting base (1) and is threadedly connected to the pressure plate (31).
4. The focus adjustment structure according to claim 3, characterized in that: The locking structure (3) further includes a step screw (33), the step screw (33) including a head, a step portion, and a threaded portion connected in sequence, the outer diameter of the step portion being larger than the outer diameter of the threaded portion, the threaded portion being threadedly connected to the mounting base (1), the step portion being passed through the pressure plate (31), and the head being located at an end of the pressure plate (31) away from the mounting base (1).
5. The focus adjustment structure according to any one of claims 1 to 4, characterized in that: One of the frame (100) and the mounting base (1) is connected with a slider (101), and the other is provided with a slide groove (12), and the slider (101) is slidably arranged in the slide groove (12).
6. The focus adjustment structure according to claim 5, characterized in that: The slider (101) is arranged on the frame (100), and the mounting base (1) includes a base body (13) for mounting the device to be focused (200) and a connecting bar (14) slidably arranged on the base body (13), and the base body (13) and the connecting bar (14) together form the sliding groove (12). The mounting base (1) also includes a connecting bar locking screw (15), and the connecting bar locking screw (15) passes through one of the base body (13) and the connecting bar (14) and is threadedly connected to the other of the base body (13) and the connecting bar (14).
7. The focus adjustment structure according to claim 6, characterized in that: The slide groove (12) is a dovetail groove.
8. The focus adjustment structure according to claim 6, characterized in that: The connecting strip (14) further has a wedge-shaped guide groove (141), and the base body (13) is inserted into the guide groove (141).
9. The focus adjustment structure according to claim 5, characterized in that: It also includes an adjusting member (4), and the adjusting member (4) is used to drive the mounting base (1) to slide relative to the frame (100).
10. Laser coding machine, characterized in that, The invention comprises a focus adjustment structure according to any one of claims 1 to 9, and further comprises a frame (100), wherein the mounting base (1) is slidably arranged on the frame (100), and the device (200) to be focused is a field lens and is mounted on the mounting base (1), wherein the field lens is used to perform laser coding on the surface of an object to be coded, and the surface of the object to be coded is the focusing plane (300).