Adjusting structure of a lens barrel

Abstract

The utility model discloses a kind of adjusting structures of lens barrel, it is related to optical lens technical field, the adjusting structure of lens barrel includes lens barrel, adjusting seat, first lens and elastic piece, wherein, the lens barrel is formed with the adjusting cavity with opening, the adjusting seat is threadedly connected in the adjusting cavity, and is provided with mounting cavity, the mounting cavity is coaxial with the lens barrel, the first lens is movably installed in the mounting cavity, and abuts to the mounting cavity top wall, one end of the elastic piece abuts to the lens, and the other end is fixedly arranged in the adjusting cavity bottom wall, to limit the lens from the mounting cavity separation. Elastic piece continuously compresses lens, avoid the position deviation when screw is not rotated to bottom, improve adjusting stability, the coaxial design of adjusting cavity and mounting cavity simplifies optical path calibration step, reduces assembly difficulty.

Description

Technical Field

[0001] This utility model relates to the technical field of lens barrel adjustment structures, and in particular to an adjustment structure for a lens barrel. Background Technology

[0002] In the application of optical lenses, it is often necessary to have a lens whose axial distance relative to an object or plane is adjustable in order to achieve better application results. Currently, using dual optical lenses can decompose two one-dimensional directions. By combining two mutually orthogonal optical lenses, collimation in both directions can be achieved simultaneously.

[0003] Existing optical lenses can generally only be adjusted in one dimension, usually through methods such as sliding grooves, screw rotation, or gear transmission. Whether it is sliding grooves or screw rotation, there is a certain gap. This gap will cause the optical lens to have some room to wobble, which will make the optical lens unstable and may cause some deviation. Utility Model Content

[0004] The main purpose of this invention is to propose an adjustment structure for a lens barrel, which aims to stably adjust a single optical lens so that the optical lens is less likely to wobble and cause illumination deviation after one-dimensional adjustment is completed.

[0005] To achieve the above objectives, the adjustment structure of the lens barrel proposed in this utility model includes:

[0006] The microscope tube has an adjustment cavity with an opening;

[0007] An adjustment seat is threaded into the adjustment cavity and has a mounting cavity coaxial with the lens barrel;

[0008] The first lens is movably installed in the mounting cavity and abuts against the top wall of the mounting cavity;

[0009] An elastic element has one end abutting against the lens and the other end fixedly disposed on the bottom wall of the adjustment cavity to prevent the lens from detaching from the mounting cavity.

[0010] Preferably, the top of the adjustment seat is provided with a light-transmitting hole communicating with the mounting cavity, the diameter of the light-transmitting hole is smaller than the diameter of the mounting cavity, and the light-transmitting hole is coaxial with the lens barrel.

[0011] Preferably, a second lens is fixed to the top of the first lens, and the second lens is movably disposed within the light-transmitting hole.

[0012] Preferably, the adjusting cavity includes a threaded portion and a positioning portion, wherein the diameter of the positioning portion is larger than the diameter of the threaded portion.

[0013] Preferably, the adjusting seat includes a first platform and a second platform, the first platform being movably disposed within the positioning part, and the second platform being threadedly connected to the threaded part.

[0014] Preferably, the bottom wall of the adjustment cavity is provided with a light-passing hole, and the light-passing hole is coaxial with the lens barrel.

[0015] Preferably, the diameter of the light-passing hole is smaller than the length of the elastic element.

[0016] Preferably, the bottom of the first lens is provided with a hole for preventing air leakage.

[0017] Preferably, a lens retaining ring is provided between the elastic element and the first lens.

[0018] Preferably, a through hole is formed in the middle of the lens retaining ring, and the through hole is coaxial with the lens barrel.

[0019] In the technical solution provided by this utility model, the lens barrel forms an adjustment cavity with an opening. The adjustment seat is threadedly connected to the adjustment cavity and has an installation cavity. The installation cavity is coaxial with the lens barrel. The first lens is movably installed in the installation cavity and abuts against the top wall of the installation cavity. One end of the elastic member abuts against the lens, and the other end is fixedly disposed on the bottom wall of the adjustment cavity to prevent the lens from detaching from the installation cavity. The elastic member continuously presses the lens to prevent positional displacement when the thread is not screwed to the bottom, thereby improving adjustment stability. The coaxial design of the adjustment cavity and the installation cavity simplifies the optical path calibration steps and reduces assembly difficulty. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A perspective view of an embodiment of the adjustment structure for the lens barrel provided by this utility model;

[0022] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle.

[0023] Explanation of icon numbers:

[0024] 1. Adjustment seat; 2. Lens retainer ring; 3. Lens barrel; 4. First lens; 5. Second lens; 6. Elastic element.

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] 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.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, 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. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] This utility model provides an adjustment structure for the lens barrel 3. Figures 1 to 2 This is an embodiment of the adjustment structure of the lens barrel 3 provided by this utility model.

[0030] Please refer to the following: Figures 1 to 2 The adjustment structure of the lens barrel 3 includes the lens barrel 3, the adjustment seat 1, the first lens 4, and the elastic element 6. The lens barrel 3 forms an adjustment cavity with an opening. The adjustment seat 1 is threadedly connected to the adjustment cavity and has an installation cavity. The installation cavity is coaxial with the lens barrel 3. The first lens 4 is movably installed in the installation cavity and abuts against the top wall of the installation cavity. One end of the elastic element 6 abuts against the lens and the other end is fixedly set on the bottom wall of the adjustment cavity to prevent the lens from detaching from the installation cavity.

[0031] The adjustment cavity is a space inside the lens barrel 3, with an opening facing one end of the lens barrel 3. The adjustment cavity is cylindrical and coaxial with the central axis of the lens barrel 3. The inner wall of the adjustment cavity has threads for threaded connection with the adjustment seat 1; the outer circumferential surface of the adjustment seat 1 has threads that match the threads on the inner wall of the adjustment cavity, allowing the adjustment seat 1 to be adjusted within the adjustment cavity by rotating it. The adjustment seat 1 has a mounting cavity, coaxial with the lens barrel 3. The mounting cavity is cylindrical, with a diameter smaller than that of the adjustment cavity to facilitate the mounting of the first lens 4. The depth of the mounting cavity is designed according to the thickness of the first lens 4 to ensure that the first lens 4 can be completely placed within the mounting cavity. The diameter of the first lens 4 is slightly smaller than the diameter of the mounting cavity, allowing the first lens 4 to move within the mounting cavity without significant wobbling. The upper surface of the first lens 4 contacts the top wall of the mounting cavity to ensure the stability of the first lens 4's position. The first lens 4 is made of optical glass, and its surface has undergone precision grinding and polishing to ensure that no distortion occurs when light passes through. The elastic element 6 is a spring made of stainless steel, which has good elasticity and corrosion resistance. The diameter of the spring is smaller than the diameter of the mounting cavity, but larger than the diameter of the central area of ​​the first lens 4, ensuring that the spring can stably abut against the first lens 4. The other end of the spring is fixed to the bottom wall of the adjustment cavity, providing an upward elastic force through pre-compression, so that the first lens 4 is tightly attached to the top wall of the mounting cavity.

[0032] When the adjusting seat 1 is screwed into the adjusting cavity via threads, the rotational motion is converted into axial displacement, causing the first lens 4 inside the mounting cavity to move. The elastic element 6, when compressed, generates a counterforce, ensuring that the first lens 4 remains firmly against the top wall of the mounting cavity, preventing wobbling caused by thread clearance. Light enters the lens barrel 3 through the clearance hole at the bottom of the first lens 4, maintaining a clear optical path. During adjustment, the preload of the elastic element 6 counteracts lens displacement caused by external vibrations or shifts, ensuring stable positioning after adjustment.

[0033] Therefore, in the technical solution provided by this utility model, the lens barrel 3 forms an adjustment cavity with an opening, the adjustment seat 1 is threadedly connected to the adjustment cavity and has an installation cavity, the installation cavity is coaxial with the lens barrel 3, the first lens 4 is movably installed in the installation cavity and abuts against the top wall of the installation cavity, one end of the elastic member 6 abuts against the lens and the other end is fixedly set on the bottom wall of the adjustment cavity to restrict the lens from leaving the installation cavity, the elastic member 6 continuously presses the lens to avoid positional displacement when the thread is not screwed to the bottom, and improves adjustment stability. The coaxial design of the adjustment cavity and the installation cavity simplifies the optical path calibration steps and reduces assembly difficulty.

[0034] The existing adjustment structure lacks a light-passing hole limiting structure coaxial with the lens barrel 3, which makes the lens prone to radial displacement during adjustment, affecting the optical path accuracy. By forming a physical limit through the diameter difference between the light-passing hole and the mounting cavity, the radial motion freedom of the lens is forcibly constrained while ensuring the axial adjustment freedom of the lens, thereby improving the adjustment stability. Specifically, in the embodiment of this utility model, the top of the adjustment seat 1 is provided with a light-passing hole communicating with the mounting cavity. The diameter of the light-passing hole is smaller than the diameter of the mounting cavity, and the light-passing hole is coaxial with the lens barrel 3.

[0035] The diameter of the light-passing aperture is designed according to the requirements of the optical system, and is usually smaller than the diameter of the first lens 4 to ensure that light passes through the central area of ​​the first lens 4 and reduce edge distortion. The inner wall of the light-passing aperture is smooth to avoid scattering of light.

[0036] The light-transmitting aperture is designed to be coaxial with the lens barrel 3. When the adjusting seat 1 is axially displaced by rotating through the thread, the light-transmitting aperture is always aligned with the optical axis of the lens barrel 3. The design of the mounting cavity having a diameter larger than the light-transmitting aperture allows the first lens 4 to move axially under the action of the elastic element 6, while the annular step formed at the edge of the light-transmitting aperture limits excessive upward movement of the lens. During adjustment, the lens remains in close contact with the top wall of the mounting cavity under the elastic force of the elastic element 6, and the coaxial relationship between the light-transmitting aperture and the lens barrel 3 ensures that no optical path offset occurs when light passes through.

[0037] Furthermore, a second lens 5 is fixed to the top of the first lens 4, and the second lens 5 is movably disposed within the light-transmitting hole.

[0038] The diameter of the second lens 5 is slightly smaller than the diameter of the light-transmitting aperture, allowing it to move within the aperture without significant wobbling. The second lens 5 is fixedly connected to the first lens 4 with optical adhesive, forming a single unit. The second lens 5 is also made of optical glass, but its refractive index differs from that of the first lens 4. The two lenses, when used together, can correct chromatic aberration or other optical defects.

[0039] When the adjusting seat 1 rotates within the adjusting cavity of the lens barrel 3, the first lens 4 experiences axial displacement under the action of the elastic element 6. Simultaneously, the second lens 5 slides within the light-transmitting hole as the first lens 4 moves. Because the inner wall of the light-transmitting hole forms a clearance fit with the outer circumferential surface of the second lens 5, the radial degree of freedom of the second lens 5 is restricted during its movement, thereby eliminating lens tilting problems caused by thread clearance or assembly errors. Simultaneously, the fixed connection between the second lens 5 and the first lens 4 forms a rigid assembly, preventing relative displacement deviations that occur during individual adjustment.

[0040] Traditional threaded adjustment structures are prone to lens wobbling due to the fit clearance of the threaded pair. This solution creates a double constraint by adding a positioning part. Specifically, in the embodiment of this utility model, the adjustment cavity includes a threaded part and a positioning part, and the diameter of the positioning part is larger than the diameter of the threaded part.

[0041] The threaded part is located at the upper part of the adjusting cavity, and the positioning part is located at the lower part of the adjusting cavity. The inner wall of the threaded part is threaded for threaded connection with the adjusting seat 1. The inner wall of the positioning part is smooth and has no threads. Its diameter is larger than that of the threaded part, forming a stepped structure. This design restricts the range of movement of the adjusting seat 1 within the adjusting cavity, preventing the adjusting seat 1 from completely disengaging from the adjusting cavity.

[0042] The adjusting cavity is constructed as a stepped cavity with different diameters. The threaded part engages with the external thread of the adjusting seat 1 to form a helical pair, while the positioning part forms an axial limiting surface through the diameter difference. When the adjusting seat 1 is screwed into the adjusting cavity, its shoulder contacts the limiting step of the positioning part. At this time, the threaded part only undertakes the axial movement function, while the positioning part undertakes the radial positioning function. This split structure allows the adjusting seat 1 to maintain axial movement freedom during rotation while eliminating the radial clearance generated by traditional single-diameter threaded cavities.

[0043] Furthermore, the adjusting seat 1 includes a first part and a second part, the first part being movably disposed within the positioning part, and the second part being threadedly connected to the threaded part.

[0044] The diameter of the first stage is slightly smaller than that of the positioning stage, allowing the first stage to move within the positioning stage without significant wobbling. The outer circumferential surface of the second stage has threads that match the threads on the inner wall of the threaded section, and the position of the adjusting seat 1 within the adjusting cavity can be adjusted by rotating the adjusting seat 1. A stepped structure is formed between the first and second stages, corresponding to the stepped structure of the adjusting cavity.

[0045] When the adjusting seat 1 rotates through the threaded engagement between the second stage and the threaded part, the first stage moves axially within the positioning part. Due to the clearance fit between the inner diameter of the positioning part and the outer diameter of the first stage, the radial degree of freedom of the adjusting seat 1 is constrained, retaining only the axial degree of freedom. During this process, the threaded rotation of the second stage drives the adjusting seat 1 to translate along the axis of the lens barrel 3, while the contact surfaces of the first stage and the positioning part maintain coaxiality, avoiding radial offset caused by thread clearance.

[0046] Traditional adjustment structures do not have a dedicated light-passing hole at the bottom of the adjustment cavity, which may cause the light transmission path to be blocked by the elastic element 6 or the mounting structure. It is necessary to add an additional light guide element or a complex hole-avoiding structure. By optimizing the closed hole structure, the light transmission path is avoided from being blocked by the elastic element 6 or the mounting structure. Specifically, in the embodiment of this utility model, a light-passing hole is provided on the bottom wall of the adjustment cavity, and the light-passing hole is coaxial with the lens barrel 3.

[0047] The light-passing aperture is coaxial with the lens barrel 3, ensuring that light rays do not deflect when passing through the bottom wall of the adjustment cavity along the axis of the lens barrel 3. When the first lens 4 moves axially along the mounting cavity under the action of the elastic element 6, the light-passing aperture provides a stable transmission channel for the light, preventing the light path from being blocked or deflected due to adjustment movements. Changes in the compression or extension state of the elastic element 6 do not affect the light-passing function of the light-passing aperture, thereby achieving synchronous control of lens position adjustment and optical path stability.

[0048] Furthermore, the diameter of the light-passing hole is smaller than the length of the elastic element 6.

[0049] When the adjusting seat 1 is axially displaced by rotating through the thread, the lens is kept in contact with the top wall of the mounting cavity by the elastic force of the elastic element 6. The light passage is coaxially set with the lens barrel 3 to ensure that light does not deviate from the optical axis when passing through. Since the diameter of the light passage is limited to less than the length of the elastic element 6, when the elastic element 6 is compressed, its radial movement space is restricted by the inner wall of the light passage, thereby preventing the lens from shifting due to excessive bending or tilting of the elastic element 6. The proportional relationship between the length of the elastic element 6 and the diameter of the light passage further ensures that the elastic element 6 always deforms linearly along the axial direction during compression, maintaining the coaxiality of the lens adjustment.

[0050] Traditional adjustment structures do not have a hole for avoiding light, which means that light has to go around the edge of the lens or rely on an additional light-transmitting structure, which can easily cause light path deviation or energy loss. In order to avoid assembly errors caused by adding light-transmitting components, in the embodiment of this utility model, a hole for avoiding light is provided at the bottom of the first lens 4.

[0051] An aperture is a hole-like structure located in the central area of ​​the bottom of the first lens 4. It can be implemented as a circular through-hole or a stepped hole, and its diameter can be larger than the light transmission range of the central area of ​​the lens. This structure is used to prevent interference between the bottom of the lens and the elastic element 6 or other components, while providing an unobstructed path for the central light rays.

[0052] A clearance hole extends through the bottom of the first lens 4, and its axis coincides with the axis of the lens barrel 3. When the elastic member 6 applies a preload to bring the first lens 4 against the top wall of the mounting cavity, the clearance hole provides a path for light in the central area, preventing light from being blocked by the bottom of the lens. For example, the diameter of the clearance hole can be 30%-50% of the lens diameter, maximizing the light transmission area while ensuring structural strength. During the movement of the lens, a gap is formed between the clearance hole and the elastic member 6, preventing friction or collision between the elastic member 6 and the lens when the latter moves.

[0053] A lens retaining ring 2 is provided between the elastic element 6 and the first lens 4.

[0054] The lens retaining ring 2 is mounted on top of the elastic element 6, with its annular end face contacting the bottom edge of the first lens 4. When the adjusting seat 1 changes its axial position by rotating its thread, the elastic element 6 applies uniform axial pressure to the first lens 4 through the lens retaining ring 2, ensuring that the lens remains firmly against the top wall of the mounting cavity. The annular structure of the lens retaining ring 2 transmits pressure while providing space for the central clearance hole, ensuring unobstructed light passage. When the lens position needs to be adjusted, the compression of the elastic element 6 is uniformly changed through the lens retaining ring 2, preventing the lens from tilting due to uneven force.

[0055] In some specific embodiments, the outer diameter of the lens retaining ring 2 can form a clearance fit with the inner diameter of the mounting cavity, for example, the clearance is controlled within the range of 0.05 mm to 0.2 mm, which ensures axial pressure transmission while avoiding radial frictional resistance. The inner diameter of the lens retaining ring 2 can be larger than the diameter of the clearance hole, for example, the inner diameter is one to three mm larger than the clearance hole, to ensure that the light path is not blocked.

[0056] Furthermore, a through hole is formed in the middle of the lens retaining ring 2, and the through hole is coaxial with the lens barrel 3.

[0057] The lens retaining ring 2 is coaxial with the lens barrel 3 through a central through-hole, ensuring that the pressure applied by the elastic element 6 is evenly distributed across the edge region of the first lens 4, preventing the lens from shifting during adjustment. The through-hole design allows light to pass through the retaining ring along the axis of the lens barrel 3, ensuring an unobstructed light path. When the adjusting seat 1 rotates, the lens retaining ring 2 is axially aligned with the lens barrel 3 through the through-hole, further limiting the radial displacement of the first lens 4.

[0058] In use, the position of the adjusting seat 1 within the adjusting cavity can be changed by rotating it, thereby adjusting the positions of the first lens 4 and the second lens 5 to achieve precise adjustment of the optical system. The elastic force provided by the elastic element 6 ensures that the first lens 4 remains firmly against the top wall of the mounting cavity, preventing the first lens 4 from shaking or falling off during adjustment. The lens pressure ring 2 disperses the pressure of the elastic element 6 on the first lens 4, protecting the first lens 4 from damage. The entire structure is compact, easy to operate, and can meet the adjustment requirements of high-precision optical systems.

[0059] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the concept of the present utility model and using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present utility model.

Claims

1. An adjustment structure for a microscope tube, characterized in that, include: The microscope tube has an adjustment cavity with an opening; An adjustment seat is threaded into the adjustment cavity and has a mounting cavity coaxial with the lens barrel; The first lens is movably installed in the mounting cavity and abuts against the top wall of the mounting cavity; An elastic element has one end abutting against the lens and the other end fixedly disposed on the bottom wall of the adjustment cavity to prevent the lens from detaching from the mounting cavity.

2. The adjustment structure of the lens barrel as described in claim 1, characterized in that, The top of the adjustment seat is provided with a light-transmitting hole that communicates with the mounting cavity. The diameter of the light-transmitting hole is smaller than the diameter of the mounting cavity, and the light-transmitting hole is coaxial with the lens barrel.

3. The adjustment structure of the lens barrel as described in claim 2, characterized in that, A second lens is fixed to the top of the first lens, and the second lens is movably disposed within the light-transmitting hole.

4. The adjustment structure of the lens barrel as described in claim 1, characterized in that, The adjusting cavity includes a threaded portion and a positioning portion, wherein the diameter of the positioning portion is larger than the diameter of the threaded portion.

5. The lens barrel adjustment structure as described in claim 4, characterized in that, The adjusting seat includes a first part and a second part, the first part being movably disposed within the positioning part, and the second part being threadedly connected to the threaded part.

6. The adjustment structure of the lens barrel as described in claim 1, characterized in that, The bottom wall of the adjustment cavity is provided with a light-passing hole, which is coaxial with the lens barrel.

7. The lens barrel adjustment structure as described in claim 6, characterized in that, The diameter of the light-passing hole is smaller than the length of the elastic element.

8. The adjustment structure of the lens barrel as described in claim 1, characterized in that, The first lens has a hole at its bottom.

9. The adjustment structure of the lens barrel as described in claim 1, characterized in that, A lens retaining ring is provided between the elastic element and the first lens.

10. The lens barrel adjustment structure as described in claim 9, characterized in that, A through hole is formed in the middle of the lens retaining ring, and the through hole is coaxial with the lens barrel.

Images