Precise focusing mechanism
Through the combination of screw rod with a lead of 0.2-0.3mm, screw nut and meshing bevel gear, the lens deflection and accuracy problems of the existing focus mechanism are solved, precise focus and convenient installation are achieved, and a variety of application scenarios are adapted to.
Patent Information
- Application Number
- CN202422574739.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-24
AI Technical Summary
The existing focus mechanism has problems such as axial deflection, front and back movement, low accuracy, small adjustment stroke, and large size, which leads to a decrease in optical path deviation and overall accuracy, making it difficult to adapt to a variety of application scenarios.
The screw rod and screw nut with a lead of 0.2-0.3mm are used to combine the guide rail pair to achieve precise focus of the lens through bevel gears A and bevel gear B that are perpendicular and meshed with each other, and to improve the system accuracy and coaxiality using an integrated molded bottom plate and standard parts.
Effectively prevent the lens from axial deflection and forward and backward movement, improve focus accuracy, reduce optical path deviation, reduce the size of the focus device, facilitate integrated installation, and improve overall accuracy.
Smart Images
Figure CN223284443U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optics and laser processing, in particular to a precision focusing mechanism. Background Art
[0002] With the rapid development of laser technology in recent years, the requirements for lasers have become increasingly higher. For example, during laser processing, when there is a height difference between the processed parts, the laser processing distance to the part needs to be adjusted to ensure that the processed part is in the focal plane.
[0003] Currently, focusing mechanisms are commonly used on the market, such as Figure 1 and Figure 2 As shown, Figure 1 This is an exploded diagram of the existing focusing mechanism. Figure 2 Figure 1 is an assembly diagram of an existing focusing mechanism. Figure 1 As shown, the existing focusing mechanism adheres the lens 92 to the lens fixing block 93 by dispensing glue on the periphery of the lens 92, and then installs the lens fixing block 93 in the focusing guide block 91. The focusing guide block 91 is provided with an adjustment bar hole 96, and the lens fixing block 93 is provided with a screw hole 95. The adjustment screw 94 passes through the adjustment bar hole 96 and is screwed into the screw hole 95. The adjustment screw 94 can move in the adjustment bar hole 96. When the lens 92 is adjusted to the desired position, the adjustment screw 94 is rotated until the adjustment screw 94 abuts against the adjustment bar hole, thereby fixing the lens fixing block 93 and further fixing the lens 92. Figure 2 However, the above commonly used focusing mechanism has the following disadvantages:
[0004] 1. Optical path deviation occurs after tightening the adjusting screw 94. When the lens 92 is adjusted to a suitable position and tightened with the adjusting screw 94, the axial rotation and tightening between the adjusting screw 94 and the screw hole can easily cause the lens 92 to deflect axially, resulting in optical path deviation.
[0005] 2. The locking method in which the adjusting screw 94 abuts against the upper surface of the adjusting bar hole results in a large guide fit clearance and low precision, which makes it easy for the lens 92 to move forward and backward.
[0006] 3. The locking method of the adjusting screw 94 against the upper surface of the adjusting bar hole can easily cause wear of the upper surface of the adjusting bar hole when rubbed repeatedly for a long time, thereby reducing the overall accuracy of the existing focusing mechanism.
[0007] 4. The existing focusing mechanism has a small adjustment stroke, is inconvenient to adjust, and cannot cover most application scenarios.
[0008] 5. The existing focusing mechanism is relatively large in size, and it is difficult to install and fix it in existing machinery and equipment after integration, resulting in a decrease in overall accuracy.
[0009] Based on the above optical development requirements and the shortcomings of existing frame adjustment modules, a precision focusing mechanism is developed. Utility Model Content
[0010] In order to solve the above technical problems, the utility model provides a precision focusing mechanism, which effectively prevents the axial deflection and forward and backward movement of the lens, has a large adjustment stroke, and is easy to operate.
[0011] The utility model solves the above-mentioned technical problems as follows:
[0012] A precision focusing mechanism comprises a base plate, a movable mirror frame, a transmission device for driving the mirror frame to move, and a power device;
[0013] The bottom plate is provided with a guide rail pair, a mirror frame is fixed on a slider of the guide rail pair, the mirror frame is provided with a lens mounting hole, and the lens is mounted in the lens mounting hole;
[0014] The transmission device includes a screw, a screw nut and a bracket, the screw nut is fixed to the mirror frame, both ends of the screw are mounted on the bracket, and the bracket is mounted on the base plate;
[0015] The power device is connected to one end of the screw rod.
[0016] Furthermore, the lead of the screw is 0.2-0.3 mm. It is understandable that when the lead of the screw is 0.2-0.3 mm, the smaller the displacement of the screw driven by the screw nut, the smaller the displacement of the screw nut driven by the screw frame and lens, and the more precise the focusing of the entire focusing mechanism.
[0017] Furthermore, the power device includes a gear base, an adjustment shaft, and bevel gears A and B that are perpendicular to each other and meshing;
[0018] The gear base is fixed to the base plate and has a first axial hole formed in the gear base. The adjustment shaft passes through the first axial hole and is fixed to bevel gear A, which is then fixed to one end of the screw. When the adjustment shaft is rotated, it can be adjusted manually or by a machine. The adjustment shaft drives bevel gear A to rotate. Since bevel gears A and B are perpendicular to each other and meshing, the vertical rotation of bevel gear A is adjusted to the horizontal rotation of bevel gear B, thereby driving the rotation of the screw. The screw then drives the horizontal movement of the screw nut. The screw nut drives the mirror frame to move horizontally along the guide rail of the guide rail pair, thereby achieving horizontal movement of the lens and completing precise focusing of the lens. After precise focusing of the lens is completed, it is only necessary to fix the adjustment shaft in place. This can be achieved by simple pressing or other methods to prevent axial rotation of the lens or movement of the front and back position.
[0019] Furthermore, the brackets are bracket A and bracket B that are parallel to each other, the gear base, the bottom surfaces of bracket A and bracket B are in the same horizontal plane, and a second axial hole is opened on bracket A, a third axial hole is opened on bracket B, and the screw nut is located between bracket A and bracket B;
[0020] The third shaft hole, the screw nut, the second shaft hole and the bevel gear B are coaxial, and the first shaft hole and the bevel gear A are coaxial.
[0021] The focusing mechanism's bracket, gear base, and guide rail pair are all mounted on a single, integrally molded baseplate, along with the lens mount. The guide rail pair is a commercially available standard component, as are the mutually perpendicular, meshing bevel gears A and B, which are also highly precise and commercially available standard components. This ensures close system tolerances. The gear base, bracket A, and bracket B's bottom surfaces are coaxial, and the third axis hole, lead screw nut, second axis hole, and bevel gear B are coaxial. The first axis hole and bevel gear A are also coaxial, ensuring high system coaxiality, perpendicularity, and linearity.
[0022] Furthermore, bearings are installed in the first shaft hole, the second shaft hole and the third shaft hole respectively, ensuring smoother rotation between the screw rod and the adjustment shaft, and between the screw rod and the bracket A and the bracket B.
[0023] Furthermore, the mounting bottom of bracket B has a positioning protrusion downward, and the bottom plate has a positioning bar hole, and the positioning protrusion is inserted into the bar positioning hole, which facilitates the assembly and integration of the focusing mechanism.
[0024] Furthermore, a cross-shaped recess is provided on the top surface of the adjusting shaft, which facilitates the use of a tool to rotate the adjusting shaft.
[0025] Furthermore, the screw nut is fixed to the frame by screws, and the lens is adhered to the lens mounting hole.
[0026] Furthermore, soft rubber is provided between the mounting bottom surface of the mirror frame and the slider of the guide rail pair.
[0027] The utility model has the following advantages over the prior art:
[0028] 1. In existing focusing mechanisms, after adjusting the lens position, the adjustment screw passes through the adjustment bar hole and is screwed into the screw hole until the adjustment screw contacts the adjustment bar hole, thereby locking the lens. However, as the adjustment screw is screwed into the screw hole, the rotation of the adjustment screw causes the lens to rotate axially, thereby affecting the perpendicularity or alignment of the light with the lens. Furthermore, the locking process may cause the lens to shift forward and backward, affecting the accuracy of lens focusing. However, the precision focusing mechanism of this design only requires fixing the adjustment shaft, for example, with a simple press, after adjusting the lens position. This reduces the possibility of optical path deviation.
[0029] 2. The existing focusing mechanism uses a manual lens fixing block to move the lens to adjust the lens position, which has poor accuracy. This design uses a lead screw and screw nut with a lead of 0.2-0.3mm and a guide rail pair to achieve focusing of the frame and lens, which has higher focusing accuracy.
[0030] 3. The adjustment stroke of existing focusing mechanisms is determined by the length of the adjustment hole. Therefore, if the adjustment hole is too long, the focusing guide block becomes larger, and the entire focusing mechanism becomes bulky, making it difficult to install and fix within existing machinery and equipment after integration. The adjustment stroke of the precision focusing mechanism designed in this design is determined by the length of the guide rails in the guide rail pair, which is independent of the size of the lens frame. Moreover, the mutually perpendicular and meshing bevel gears A and B not only enable machine adjustment but also convert power from vertical to horizontal, significantly reducing the size of the precision focusing device. This makes it easy to install and fix within existing machinery and equipment after integration.
[0031] 4. This precision focusing mechanism has higher precision, higher coaxiality, verticality and linearity through the cooperation between one-piece molded parts and standard parts purchased on the market.
[0032] Terms such as "inside" and "outside" used herein to denote relative spatial positions are used for ease of explanation to describe the relationship of one feature relative to another, as shown in the accompanying drawings. It should be understood that, depending on the placement of the product, these terms may be intended to encompass different orientations besides those depicted in the drawings and should not be construed as limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] Figure 1 It is an exploded diagram of the existing focusing mechanism.
[0034] Figure 2 It is an assembly diagram of an existing focusing mechanism.
[0035] Figure 3 It is a structural schematic diagram of the precision focusing mechanism of Example 1.
[0036] Figure 4 yes Figure 3 Schematic diagram from another angle.
[0037] Figure 5 yes Figure 3 Partial exploded view.
[0038] Figure 6 yes Figure 3 Another partial exploded view. DETAILED DESCRIPTION
[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.
[0040] Example 1:
[0041] like Figure 3 or Figure 4 As shown, a precision focusing mechanism includes a base plate 1, a movable lens frame 2, a transmission device 3 for driving the lens frame to move, and a power device 4;
[0042] The base plate 1 is provided with a guide rail pair 6, a slide block 61 of the guide rail pair 6 is fixed with a frame 2, the frame 2 is provided with a lens mounting hole 21, and a lens 22 is mounted in the lens mounting hole 21;
[0043] The transmission device 3 includes a screw 31, a screw nut 32 and a bracket 33. The screw nut 32 is fixed to the frame 2. Both ends of the screw 31 are mounted on the bracket 33. The bracket 33 is mounted on the base plate 1.
[0044] The power device 4 is connected to one end of the screw rod 31 .
[0045] In this embodiment, Figure 4 As shown, the lead of the screw 31 is 0.25 mm (the screw threads are not shown in the figure because the lead is too small and the screw threads are too dense to be clearly represented by lines). When the lead of the screw 31 is 0.25 mm, the smaller the displacement of the screw nut 32 driven by the screw 31, the smaller the displacement of the lens frame 2 and lens 22 driven by the screw nut 32, and the more precise the focusing of the entire focusing mechanism.
[0046] In this embodiment, Figure 5 As shown, the power device 4 includes a gear base 41, an adjustment shaft 42, and a bevel gear A43 and a bevel gear B44 that are perpendicular to each other and meshed;
[0047] In this embodiment, Figure 5 、 Figure 6 As shown, the gear base 41 is fixed on the base plate 1 , and the gear base 41 is provided with a first shaft hole 45 , the adjustment shaft 42 passes through the first shaft hole 45 and is fixed to the bevel gear A 43 , and the bevel gear B 44 is fixed to one end of the screw rod 31 .
[0048] In this embodiment, Figure 4 、 Figure 5 、 Figure 6As shown, the bracket 33 is a bracket A34 and a bracket B35 that are parallel to each other. The bottom surfaces of the gear base 41, the bracket A34, and the bracket B35 are in the same horizontal plane. A second shaft hole 36 is opened on the bracket A34, and a third shaft hole 37 is opened on the bracket B35. The screw nut 32 is located between the bracket A34 and the bracket B35.
[0049] The third shaft hole 37 , the screw nut 32 , the second shaft hole 36 and the bevel gear B 44 are coaxial, and the first shaft hole 45 and the bevel gear A 43 are coaxial.
[0050] like Figure 4 、 Figure 5 As shown, when the adjustment shaft 42 is rotated, the rotation can be adjusted manually, and the adjustment shaft 42 drives the bevel gear A43 to rotate. Since the bevel gear A43 and the bevel gear B44 are perpendicular to each other and meshing, the vertical rotation of the bevel gear A43 is adjusted to the horizontal rotation of the bevel gear B44, thereby driving the rotation of the screw rod 31. The screw rod 31 then drives the horizontal movement of the screw nut 32. The screw nut 32 drives the lens frame 2 to move horizontally along the slide rail 62 of the guide rail pair 6, thereby achieving horizontal movement of the lens 22 and completing the fine focus of the lens 22. After the fine focus of the lens 22 is completed, it is only necessary to fix the adjustment shaft 42. By simply pressing the adjustment shaft 42 to prevent the adjustment shaft 42 from rotating axially or moving the front and back position, the lens 22 can be prevented.
[0051] like Figure 4 As shown, the focusing mechanism of this design, including bracket A34, bracket B35, gear base 41, and guide rail pair 6, are all mounted on the same base plate 1. This base plate 1 is integrally formed, as is the lens frame 2. The guide rail pair 6 is a commercially available standard component. The mutually perpendicular and meshing bevel gears A43 and B44 are also commercially available standard components with high precision, thus ensuring a low system tolerance. Furthermore, the bottom surfaces of the gear base 41, bracket A, and bracket B are on the same horizontal plane. The third axial hole 37, screw nut 32, second axial hole 36, and bevel gear B44 are coaxial, and the first axial hole 45 and bevel gear A43 are coaxial, ensuring high coaxiality, perpendicularity, and linearity of the system.
[0052] In this embodiment, Figure 5 As shown, bearings 24 are respectively installed in the first shaft hole 45, the second shaft hole 36 and the third shaft hole 37 to ensure smooth rotation between the screw rod 31 and the adjustment shaft 42, the screw rod 31 and the bracket A34, and the bracket B35.
[0053] In this embodiment, Figure 6 As shown, the mounting bottom surface of the bracket B has a positioning protrusion 46 downward, and the bottom plate 1 has a positioning strip hole 11, and the positioning protrusion 46 is inserted into the strip positioning hole 11. This facilitates the assembly and integration of the focusing mechanism.
[0054] In this embodiment, Figure 4 As shown, the top surface of the adjusting shaft 42 is provided with a cross-shaped recess 47, which facilitates the use of a cross tool to rotate the adjusting shaft 42.
[0055] In this embodiment, Figure 3 As shown, the screw nut 32 is fixed to the frame 2 by screws, and the lens 22 is adhered in the mounting hole of the lens 22.
[0056] In this embodiment, Figure 5 As shown, soft glue 23 is provided between the mounting bottom surface of the mirror frame 2 and the slider 61 of the guide rail pair 6 .
[0057] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. Precision focusing mechanism, characterized by: It includes a base plate, a movable mirror frame, a transmission device for driving the mirror frame to move, and a power device; The bottom plate is provided with a guide rail pair, a mirror frame is fixed on a slider of the guide rail pair, the mirror frame is provided with a lens mounting hole, and the lens is mounted in the lens mounting hole; The transmission device includes a screw, a screw nut and a bracket, the screw nut is fixed to the mirror frame, both ends of the screw are mounted on the bracket, and the bracket is mounted on the base plate; The power device is connected to one end of the screw rod.
2. The precision focusing mechanism according to claim 1, characterized in that: The lead of the screw rod is 0.2-0.3 mm.
3. The precision focusing mechanism according to claim 1, characterized in that: The power device includes a gear base, an adjustment shaft, and bevel gears A and B that are perpendicular to each other and meshing; The gear base is fixed on the bottom plate, and a first shaft hole is opened in the gear base. The adjustment shaft passes through the first shaft hole and is fixed to the bevel gear A, and the bevel gear B is fixed to one end of the screw rod.
4. The precision focusing mechanism according to claim 3, characterized in that: The brackets are bracket A and bracket B that are parallel to each other, the bottom surfaces of the gear base, bracket A and bracket B are in the same horizontal plane, and a second axial hole is opened on bracket A, a third axial hole is opened on bracket B, and the screw nut is located between bracket A and bracket B; The third shaft hole, the screw nut, the second shaft hole and the bevel gear B are coaxial, and the first shaft hole and the bevel gear A are coaxial.
5. The precision focusing mechanism according to claim 4, characterized in that: Bearings are installed in the first shaft hole, the second shaft hole and the third shaft hole respectively.
6. The precision focusing mechanism according to claim 4, characterized in that: The mounting bottom surface of bracket B has a positioning protrusion downward, and the bottom plate has a positioning strip hole, and the positioning protrusion is inserted into the strip positioning hole.
7. The precision focusing mechanism according to claim 3, characterized in that: A cross-shaped recess is formed on the top surface of the adjusting shaft.
8. The precision focusing mechanism according to claim 1, wherein: The screw nut is fixed to the frame by screws, and the lens is bonded in the lens mounting hole.
9. The precision focusing mechanism according to claim 1, characterized in that: Soft glue is provided between the mounting bottom surface of the mirror frame and the slider of the guide rail pair.