Focusing device for improving focusing precision based on long lens cone

Abstract

The utility model relates to the technical field of focusing, in particular to a focusing device for improving focusing precision based on a long lens cone, which comprises a substrate; the fixed lens cone is arranged on the substrate; the fixed lens cone is provided with an axial chute, and one end of the fixed lens cone is provided with a laser light source. The lengthened inner lens cone is movably arranged in the fixed lens cone at a preset gap; a focusing lens is arranged at one end, close to the laser light source, of the lengthened inner lens cone; the driving mechanism is arranged on the base plate; the driving mechanism is connected with the lengthened inner lens cone through the adjusting mechanism and the axial sliding groove and drives the lengthened inner lens cone to move along the axial sliding groove. And the axial deviation angle between the lengthened inner lens cone and the fixed lens cone is reduced along with the increase of the length of the lengthened inner lens cone, so that the focusing precision is improved. The focusing device has the advantages that by lengthening the inner lens cone and simplifying the structures of the lengthened inner lens cone and the fixed lens cone, the stability of the focusing device is remarkably improved, and the problem of light spot shaking is solved.

Description

Technical Field

[0001] This utility model relates to the field of focusing technology, and in particular to a focusing device based on a long lens barrel to improve focusing accuracy. Background Technology

[0002] In laser optical instruments, the focusing tube is the core component for focal length adjustment. Currently, most focusing tubes are relatively short, which makes them prone to shaking during movement, affecting focusing accuracy and image quality. Furthermore, the short focusing tube design also has certain flaws. During motor-driven focusing operations, insufficient axis length and poor overall structural rigidity of the tube result in highly unstable light spot projection and significant shaking. Even manual up-and-down movement of the tube in an attempt to achieve precise focusing cannot avoid severe shaking, seriously affecting optical observation and imaging applications, and greatly limiting the use of optical instruments in high-precision scenarios.

[0003] Existing focusing lens tubes typically consist of an outer lens tube, an inner primary lens tube, and a motor drive. However, in practical use, due to the relatively short length of the focusing lens tube, it is prone to wobbling during movement, leading to decreased focusing accuracy and affecting the imaging quality of the optical instrument. Furthermore, the wobbling accelerates the wear and tear on mechanical components, reducing the instrument's lifespan. Utility Model Content

[0004] In view of this, the present invention aims to provide a focusing device that improves focusing accuracy based on a long lens barrel. By increasing the length of the lens barrel, the shaking of the lens barrel during movement is effectively reduced, thereby improving focusing accuracy and stability.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A focusing device for improving focusing accuracy based on a long lens barrel includes: a base plate, a fixed lens barrel, an extended inner lens barrel, an adjustment mechanism, and a drive mechanism; the fixed lens barrel and the drive mechanism are disposed on the base plate; an axial groove is provided on the fixed lens barrel, and a laser light source is provided at one end of the fixed lens barrel; the extended inner lens barrel is movably disposed inside the fixed lens barrel with a preset gap; a focusing lens is provided at the end of the extended inner lens barrel near the laser light source; one end of the adjustment mechanism is connected to the drive mechanism, and the other end of the adjustment mechanism passes through the axial groove and is connected to the extended inner lens barrel; the drive mechanism drives the adjustment mechanism, thereby causing the extended inner lens barrel to move along the axial groove; the axial deviation angle β between the extended inner lens barrel and the fixed lens barrel is calculated using the following formula:

[0006] ;

[0007] Where △t is the preset gap, L is the length of the extended endoscope tube before it is lengthened, and n is the length increase coefficient of L, where n is greater than or equal to 2.

[0008] Furthermore, the value of n ranges from 2 to 6.

[0009] Furthermore, the extended endoscope barrel is provided with a threaded hole; the adjustment mechanism includes a connecting block, a limiting slider, and a connecting bolt, the connecting bolt passing through the connecting block and the limiting slider in sequence and connecting to the threaded hole of the extended endoscope barrel; the connecting block is connected to the drive mechanism, and the limiting slider is at least partially embedded in the axial groove; the drive mechanism drives the limiting slider to move along the axial groove through the connecting block, and then drives the extended endoscope barrel and the focusing lens to move along the axial groove through the connecting bolt.

[0010] Furthermore, the connecting block is U-shaped in general, including a connecting part, and a first mounting part and a second mounting part arranged in parallel and connected to both ends of the connecting part; the connecting part is provided with a connecting hole for the connecting bolt to pass through, the first mounting part is provided with a first mounting hole, and the second mounting part is provided with a second mounting hole; the first mounting hole and the second mounting hole are connected to the connecting hole of the drive mechanism by bolts, so that the connecting block is connected to the drive mechanism.

[0011] Furthermore, the limiting slider has a cylindrical structure with an axial through hole in its center for the connecting bolt to pass through; the diameter of the limiting slider is adapted to the width of the axial groove.

[0012] Furthermore, the extended endoscope tube is a circular tube, and a cross-shaped adhesive groove is provided at the end where the focusing lens is installed, which is used to glue the focusing lens onto the extended endoscope tube.

[0013] Furthermore, the drive mechanism is connected to the substrate via an L-shaped connector. The short side of the L-shaped connector has an elongated hole for connecting to the substrate, and the long side of the L-shaped connector is connected to the drive mechanism.

[0014] Furthermore, the drive mechanism is a stepper motor slide.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] 1) By lengthening the inner tube and simplifying the structure of the lengthened inner tube and the fixed tube, the stability of the focusing device was significantly improved, and the problem of light spot jitter was solved.

[0017] 2) By lengthening the endoscope tube, the focusing accuracy was improved without changing the processing precision.

[0018] 3) An axial groove is provided on the side wall of the substrate. The limiting slider cooperates with the side wall of the axial groove to provide guidance for the movement of the extended endoscope barrel. At the same time, the limiting slider controls the depth of the connecting bolts into the extended endoscope barrel through axial limiting.

[0019] 4) The focusing device of this utility model is simple and compact, with fewer parts and lower manufacturing cost. Attached Figure Description

[0020] The accompanying drawings, which form part of this invention, are used to provide a further understanding of this invention. The illustrative embodiments and descriptions of this invention are used to explain this invention and do not constitute an undue limitation of this invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the focusing device for improving focusing accuracy based on a long lens barrel, according to an embodiment of the present invention.

[0022] Figure 2 This is an exploded view of a focusing device based on a long lens barrel to improve focusing accuracy, according to an embodiment of the present invention.

[0023] Figure 3 This is a structural schematic diagram of the fixed lens tube provided according to an embodiment of the present utility model;

[0024] Figure 4 This is a structural schematic diagram of the extended endoscope tube provided according to an embodiment of the present utility model;

[0025] Figure 5 This is a structural schematic diagram of the connecting block provided according to an embodiment of the present utility model;

[0026] Figure 6 This is a structural schematic diagram of the L-shaped connector provided according to an embodiment of the present utility model.

[0027] The reference numerals in the attached drawings include: 1. Base plate; 2. Fixed lens barrel; 21. Axial groove; 22. Lens barrel mounting hole; 23. Light source hole; 3. Extended inner lens barrel; 31. Focusing lens mounting hole; 32. Cross-shaped dispensing groove; 33. Threaded hole; 4. Adjustment mechanism; 41. Connecting block; 411. Connecting hole; 412. First mounting hole; 413. Second mounting hole; 42. Limiting slider; 43. Connecting bolt; 5. Drive mechanism; 6. Focusing lens; 7. L-shaped connecting seat; 71. Elongated hole; 8. Fiber optic flange. Detailed Implementation

[0028] To make the purpose, technical solution, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and do not constitute a limitation thereof.

[0029] It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0030] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 6 As shown in the figure, this utility model provides a focusing device for improving focusing accuracy based on a long lens barrel, comprising: a base plate 1, a fixed lens barrel 2, an extended inner lens barrel 3, an adjustment mechanism 4, and a drive mechanism 5. The fixed lens barrel 2 and the drive mechanism 5 are disposed on the base plate 1. The extended inner lens barrel 3 is movably disposed inside the fixed lens barrel 2 with a preset gap. The drive mechanism 5 is connected to the extended inner lens barrel 3 through the adjustment mechanism 4. It should be noted that the preset gap is adjusted according to the processing level and focusing accuracy requirements.

[0034] The fixed lens barrel 2 has a cuboid structure. An axial groove 21 is provided on the side of the fixed lens barrel 2, and a lens barrel mounting hole 22 adapted to the extended lens barrel 3 is provided inside the fixed lens barrel 2. A light source hole 23 is provided on the end face of the fixed lens barrel 2 for the laser beam to pass through, and the laser source is fixed to this end face via a fiber optic flange 8. The bottom surface of the fixed lens barrel 2 is connected to the base plate 1. The length of the axial groove 21 is sufficient to meet the maximum adjustment range of the extended lens barrel 3.

[0035] The drive mechanism 5 is connected to the extended endoscope tube 3 through the adjustment mechanism 4, and drives the extended endoscope tube 3 to move along the axial slide groove 21.

[0036] The extended endoscope tube 3 is a circular tube with a wall thickness of 3mm. A focusing lens mounting hole 31 for mounting a focusing lens 6 is provided at the end of the extended endoscope tube 3 closest to the laser source. A cross-shaped adhesive groove 32 is provided on the end face of the focusing lens mounting hole 31 for adhesively attaching the focusing lens 6 to the extended endoscope tube 3. A threaded hole 33 is provided on the extended endoscope tube 3 for connection to the adjustment mechanism 4.

[0037] The axial deviation angle β between the extended endoscope tube 3 and the fixed endoscope tube 2 is:

[0038] ;

[0039] Where △t is the gap between the extended endoscope tube 3 and the fixed endoscope tube 2, L is the length of the endoscope tube before it is extended, and n is the length coefficient, which is greater than or equal to 2.

[0040] In this embodiment, the value of n ranges from 2 to 6. If the lengthening amount of the extended endoscope tube 3 is too small, the improvement in focusing accuracy will not be significant; if the lengthening amount of the extended endoscope tube 3 is too large, it will lead to a significant increase in the overall structural size of the focusing device.

[0041] As can be seen from the above formula, the length of the extended endoscope tube 3 is inversely proportional to the axial deviation angle between the extended endoscope tube 3 and the fixed endoscope tube 2. When the length of the extended endoscope tube 3 increases, the axial deviation angle decreases.

[0042] In this embodiment, the gap between the extended endoscope tube 3 and the fixed endoscope tube 2 is 0.015mm (preset gap), wherein the tolerance of the endoscope tube mounting hole 22 is +0.011mm, and the tolerance of the outer circle of the extended endoscope tube 3 is -0.004mm. The length L of the extended endoscope tube 3 before extension is 10mm, and its deviation angle α = arcsin(0.015 / 10) ≈ 0.015 / 10 = 0.0015rad.

[0043] The length of the extended endoscope tube 3 is 40 mm, and its axial deviation angle β = arcsin(0.015 / 40) ≈ 0.015 / 40 = 0.000375 rad. That is, when the length of the extended endoscope tube 3 is increased by four times compared with the original length, the axial deviation angle decreases by four times.

[0044] The above results show that, while maintaining the same machining accuracy for the endoscope mounting hole 22 and the extended inner endoscope tube 3, increasing the length of the extended inner endoscope tube 3 can effectively reduce the axial deviation angle. This design not only reduces machining difficulty but also reduces machining costs.

[0045] The adjustment mechanism 4 includes a connecting block 41, a limiting slider 42, and a connecting bolt 43. The connecting bolt 43 passes through the connecting block 41 and the limiting slider 42 in sequence and connects to the threaded hole 33 of the extended endoscope barrel 3. The connecting block 41 is connected to the drive mechanism 5, and the limiting slider 42 is at least partially embedded in the axial groove 21. The drive mechanism 5 drives the limiting slider 42 to move along the axial groove 21 through the connecting block 41, and then drives the extended endoscope barrel 3 and the focusing lens 6 to move through the connecting bolt 43, thereby realizing the focusing of the focusing lens 6.

[0046] Specifically, the connecting block 41 is U-shaped, including a connecting portion and a first mounting portion and a second mounting portion arranged parallel to each other and connected to both ends of the connecting portion. The connecting portion has a connecting hole 411 through which the connecting bolt 43 passes; the first mounting portion has a first mounting hole 412; and the second mounting portion has a second mounting hole 413. The first mounting hole 412 and the second mounting hole 413 are connected to the connecting hole of the drive mechanism 5 by bolts, thus connecting the connecting block 41 to the drive mechanism 5. The connecting hole of the drive mechanism 5 is a threaded hole.

[0047] The limiting slider 42 is a cylindrical structure with an axial through hole at its center for the connecting bolt 43 to pass through. The diameter of the limiting slider 42 is matched with the width of the axial groove 21. The limiting slider 42 controls the depth to which the connecting bolt 43 extends into the extended endoscope tube 3 by axial limiting. The limiting slider 42 cooperates with the side wall of the axial groove 21 to provide guidance for the movement of the extended endoscope tube 3.

[0048] In this embodiment, the width of the axial groove 21 is 8.1 mm, and the diameter of the limiting slider 42 is 8 mm.

[0049] The drive mechanism 5 is connected to the substrate 1 via an L-shaped connector 7. The short side of the L-shaped connector 7 has an elongated hole 71 for connecting to the substrate 1, and the long side of the L-shaped connector 7 is connected to the drive mechanism 5. In this embodiment, the drive mechanism 5 is a stepper motor slide.

[0050] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A focusing device for improving focusing accuracy based on a long lens barrel, characterized in that, include: Substrate, fixed lens barrel, extended inner lens barrel, adjustment mechanism and drive mechanism; The fixed mirror barrel and the driving mechanism are disposed on the substrate; An axial sliding groove is provided on the fixed lens barrel, and a laser light source is provided at one end of the fixed lens barrel; The extended endoscope tube is movably disposed inside the fixed endoscope tube with a preset gap; a focusing lens is disposed at one end of the extended endoscope tube near the laser light source; One end of the adjustment mechanism is connected to the drive mechanism, and the other end of the adjustment mechanism passes through the axial groove and is connected to the extended endoscope tube; The driving mechanism drives the adjusting mechanism, thereby causing the extended endoscope barrel to move along the axial groove; The formula for calculating the axial deviation angle β between the extended endoscope tube and the fixed endoscope tube is as follows: ； Where △t is the preset gap, L is the length of the extended endoscope tube before it is lengthened, and n is the length increase coefficient of L, where n is greater than or equal to 2.

2. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 1, characterized in that, The value of n ranges from 2 to 6.

3. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 1, characterized in that, The extended endoscope barrel is provided with a threaded hole; the adjustment mechanism includes a connecting block, a limiting slider and a connecting bolt, the connecting bolt passing through the connecting block and the limiting slider in sequence and connecting to the threaded hole of the extended endoscope barrel; the connecting block is connected to the driving mechanism, and the limiting slider is at least partially embedded in the axial groove; The driving mechanism drives the limiting slider to move along the axial groove through the connecting block, and then drives the extended endoscope barrel and the focusing lens to move along the axial groove through the connecting bolt.

4. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 3, characterized in that, The connecting block is U-shaped in general, including a connecting part, and a first mounting part and a second mounting part that are arranged in parallel and connected to both ends of the connecting part; The connecting part is provided with a connecting hole for the connecting bolt to pass through, the first mounting part is provided with a first mounting hole, and the second mounting part is provided with a second mounting hole; the first mounting hole and the second mounting hole are connected to the connecting hole of the driving mechanism by bolts, so that the connecting block is connected to the driving mechanism.

5. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 3, characterized in that, The limiting slider is a cylindrical structure with an axial through hole at its center for the connecting bolt to pass through; the diameter of the limiting slider is adapted to the width of the axial groove.

6. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 1, characterized in that, The extended endoscope tube is a circular tube, and a cross-shaped adhesive groove is provided at the end where the focusing lens is installed, for adhesively attaching the focusing lens to the extended endoscope tube.

7. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 1, characterized in that, The driving mechanism is connected to the substrate via an L-shaped connector. The short side of the L-shaped connector has an elongated hole for connecting to the substrate, and the long side of the L-shaped connector is connected to the driving mechanism.

8. The focusing device for improving focusing accuracy based on a long lens barrel according to claim 1, characterized in that, The driving mechanism is a stepper motor slide.

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