A focusing structure and a bifocal lens
Patent Information
- Application Number
- CN202520928181.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2026-10-27
- Estimated Expiration
- 2035-05-12
AI Technical Summary
[0003]在现有的双视场镜头中，使用单个调焦环来同时进行粗调及细调的方式具有调焦环行程较长，使用不方便的问题，使用两个调焦环进调节的方式中，一个调焦环负责粗调，另一个调焦环负责细调，采用这两种方式的双视场镜头都需要预留较大的空间，且操作不够方便，若使用电动调焦，则需要在镜头和调焦环上固定电机与传动结构，虽然可以减少预留的操作空间，但这样做成本高且故障率也会变高，另一方面，现有的双视场镜头操作过程中手部转动的幅度大，且单手操作时若可能引起画面抖动，也会因为操作不便使得对焦耗费更多时间，导致丢失拍摄目标
[0016]上述技术方案中的一个技术方案至少具有如下优点或有益效果之一：该调焦结构通过S形槽从而实现将双视场镜头调焦的细调与粗调分段进行，当第一滑杆位于S形槽的中间位置处，使用粗调钮带动第二滑杆运动，带动内镜筒大幅度的移动，实现切换焦点的位置，实现短焦和长焦之间的切换，减少了单个调焦旋钮的移动行程，当第一滑杆位于S形槽的两端位置处，使用细调钮带动第一滑杆运动，带动内镜筒小幅度的移动，实现细调对焦，该调焦结构使双视场镜头的体积更小，更适合单手操作，使用更加方便。
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Figure CN224907108U_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of optical lenses, and in particular to a focusing structure and a dual-field-of-view lens. Background Technology
[0002] Because telephoto lenses have a smaller field of view, it is more difficult to find the subject. On the other hand, short focal length lenses have a larger field of view. If you use a short focal length lens to find the subject and then switch to a telephoto lens to shoot or observe, it will take time and you may lose track of the subject. However, by using a dual field of view lens, you can quickly switch to the telephoto lens to continue tracking and observing after finding the subject at the short focal length. A dual field of view lens refers to a lens that uses the same optical system but makes the system have different focal lengths by moving the position of some lens elements.
[0003] In existing dual-field-of-view lenses, using a single focus ring for both coarse and fine adjustments has the drawbacks of a long focus ring travel and inconvenience. Using two focus rings, one for coarse adjustment and the other for fine adjustment, requires a large amount of space and is not very convenient to operate. While motorized focusing reduces the required operating space, it increases costs and the failure rate. Furthermore, existing dual-field-of-view lenses require significant hand movement during operation, and single-handed operation can cause image shake, leading to longer focusing times and potential loss of the subject. Utility Model Content
[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a focusing structure and a dual-field-of-view lens. The focusing structure is compact, and the dual-field-of-view lens using the focusing structure is convenient for focusing operations.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] A focusing structure includes a limiting cylinder, a coarse adjustment knob, a fine adjustment knob, a first slide rod, a second slide rod, an outer lens barrel, and an inner lens barrel coaxially arranged with the outer lens barrel. A side adjustment seat is provided on the outer circumferential surface of the outer lens barrel. The limiting cylinder is connected to the outer lens barrel through the side adjustment seat and is perpendicular to the outer lens barrel. The side adjustment seat has a straight through groove coaxially arranged with the outer lens barrel and an arc-shaped through groove centered at the midpoint of the straight through groove. The fine adjustment knob and the coarse adjustment knob are both installed inside the limiting cylinder and can rotate around the inner lens barrel. The limiting cylinder rotates axially. The bottom of the fine adjustment knob is provided with an S-shaped groove for providing the movement path of the first slide rod. One end of the first slide rod is connected to the endoscope tube, and the other end of the first slide rod passes through the straight through groove and is embedded in the S-shaped groove. The coarse adjustment knob is provided with a sliding groove for providing the movement path of the second slide rod. The sliding groove is arranged along the axial direction of the limiting cylinder. One end of the second slide rod is connected to the endoscope tube, and the other end of the second slide rod passes through the arc-shaped through groove and is embedded in the sliding groove.
[0007] Preferably, the coarse adjustment knob is provided with two forks along the axial direction of the limiting cylinder, and the sliding groove is formed between the two forks. The end of the second sliding rod is embedded between the two forks, and the bottom of the two forks is embedded in the arc-shaped through groove.
[0008] Preferably, the inner circumference of the outer endoscope tube is provided with a first positioning surface, the inner endoscope tube slides axially within the outer endoscope tube through the first positioning surface, and a first sealing ring is provided between the inner endoscope tube and the outer endoscope tube.
[0009] Preferably, the limiting cylinder includes a first stepped portion at the top and a second stepped portion at the bottom, the diameter of the second stepped portion is larger than the diameter of the first stepped portion, the top of the side adjustment seat is provided with a first protrusion, the first protrusion is provided with an external thread, and the inner circumference of the second stepped portion is provided with an internal thread that mates with the external thread.
[0010] Preferably, the inner circumference of the first stepped portion is provided with a pressure ring, the pressure ring is threadedly connected to the first stepped portion, the outer circumference of the fine adjustment knob is provided with a second protrusion, the pressure ring is pressed on the top of the second protrusion, a second sealing ring is provided between the fine adjustment knob and the first stepped portion, and the second protrusion is provided with a first annular groove for installing the second sealing ring.
[0011] Preferably, the coarse adjustment knob is located at the bottom of the first stepped portion, the coarse adjustment knob is located on the inner periphery of the first protrusion, the inner periphery of the first protrusion forms a second positioning surface for fixing the coarse adjustment knob, a third sealing ring is provided between the coarse adjustment knob and the first protrusion, and a second annular groove for installing the third sealing ring is provided on the outer periphery of the coarse adjustment knob.
[0012] Preferably, the outer periphery of the endoscope tube is provided with a threaded countersunk hole, the bottom of the first slide rod and the bottom of the second slide rod are both provided with external threads that cooperate with the threaded countersunk hole, and the top end face of the first slide rod and the second slide rod are both provided with a cross groove.
[0013] Preferably, a coarse adjustment lever is connected to the outer periphery of the coarse adjustment knob, and a groove for mounting the coarse adjustment lever is provided on the outer periphery of the coarse adjustment knob.
[0014] Preferably, a fine adjustment handwheel is provided on the outer periphery of the fine adjustment knob, the fine adjustment handwheel is located on the top of the fine adjustment knob, and the fine adjustment knob and the fine adjustment handwheel are connected by screws.
[0015] This utility model also provides a dual-field-of-view lens, including the focusing structure described in any of the above, wherein a first lens is installed in the outer lens barrel and a second lens is installed in the inner lens barrel.
[0016] One of the above technical solutions has at least one of the following advantages or beneficial effects: The focusing structure uses an S-shaped groove to achieve segmented fine and coarse focusing of the dual-field-of-view lens. When the first slider is in the middle of the S-shaped groove, the coarse adjustment knob drives the second slider to move, causing the inner lens barrel to move significantly, thereby switching the focus position and switching between short and long focal lengths, reducing the travel distance of a single focusing knob. When the first slider is at either end of the S-shaped groove, the fine adjustment knob drives the first slider to move, causing the inner lens barrel to move slightly, thereby achieving fine focusing. This focusing structure makes the dual-field-of-view lens smaller, more suitable for one-handed operation, and more convenient to use.
[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0019] Figure 1 This is a perspective view of one embodiment of the present utility model;
[0020] Figure 2 This is a cross-sectional view along the axial direction of the outer lens barrel of one embodiment of the present invention;
[0021] Figure 3 This is a schematic diagram of the structure of the outer lens barrel and the side adjustment seat in one embodiment of the present invention;
[0022] Figure 4 This is a cross-sectional view along the radial direction of the outer lens barrel of one embodiment of the present invention;
[0023] Figure 5 This is a perspective view of the coarse adjustment knob in one embodiment of the present invention;
[0024] Figure 6 This is a perspective view of the fine adjustment knob in one embodiment of the present invention;
[0025] Figure 7 This is one of the schematic diagrams of the working state of an embodiment of this utility model;
[0026] Figure 8 This is a second schematic diagram of the working state of an embodiment of this utility model;
[0027] Figure 9 This is the third schematic diagram of the working state of one embodiment of this utility model;
[0028] Figure 10 This is the fourth schematic diagram of the working state of one embodiment of this utility model. Detailed Implementation
[0029] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0030] In this utility model, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this utility model, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.
[0031] In this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number; "above," "below," "within," etc. are understood to include the stated number. In the description of this utility model, if "first" or "second" is used, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.
[0032] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integrally formed connection; they can refer to a mechanical connection, an electrical connection, or a connection capable of mutual communication; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0033] in, Figure 2 and Figure 3 The reference direction coordinate system of this utility model embodiment is given below, in conjunction with Figure 2 and Figure 3 The embodiments of this utility model will be described in the directions shown.
[0034] An embodiment of this utility model provides a focusing structure, including a limiting cylinder 100, a coarse adjustment knob 400, a fine adjustment knob 500, a first slide rod 600, a second slide rod 700, an outer lens barrel 300, and an inner lens barrel 200 coaxially arranged with the outer lens barrel 300. A side adjustment seat 310 is provided on the outer peripheral surface of the outer lens barrel 300. The limiting cylinder 100 is connected to the outer lens barrel 300 through the side adjustment seat 310. The limiting cylinder 100 is perpendicular to the outer lens barrel 300. A straight through groove 31 is provided on the side adjustment seat 310 coaxially arranged with the outer lens barrel 300. 1. An arc-shaped through groove 312 centered on the midpoint of the straight through groove 311. Fine adjustment knob 500 and coarse adjustment knob 400 are both installed inside the limiting cylinder 100 and can rotate around the axial direction of the limiting cylinder 100. The bottom of the fine adjustment knob 500 has an S-shaped groove 510 for providing the movement path of the first slide rod 600. One end of the first slide rod 600 is connected to the endoscope tube 200, and the other end of the first slide rod 600 passes through the straight through groove 311 and is embedded in the S-shaped groove 510. The coarse adjustment knob 400 has a groove for providing the movement path of the second slide rod 700. The sliding groove 410 of the moving path is arranged along the axial direction of the limiting cylinder 100. One end of the second sliding rod 700 is connected to the endoscope tube 200, and the other end of the second sliding rod 700 passes through the arc-shaped through groove 312 and is embedded in the sliding groove 410. When the endoscope tube 200 moves axially, the first sliding rod 600 and the second sliding rod 700 move the same distance. This focusing structure realizes the segmented fine and coarse focusing of the dual field of view lens through the S-shaped groove 510. When the first sliding rod 600 is located in the middle position of the S-shaped groove 510... When the first slider 600 is positioned at the two ends of the S-shaped groove 510, the coarse adjustment knob 400 moves the second slider 700, causing the inner lens barrel 200 to move significantly, thus switching the focus position and allowing switching between short and long focal lengths. This reduces the travel distance of a single focusing knob. When the first slider 600 is positioned at both ends of the S-shaped groove 510, the fine adjustment knob 500 moves the first slider 600, causing the inner lens barrel 200 to move slightly, thus achieving fine focusing. This focusing structure makes the dual-field-of-view lens smaller, more suitable for one-handed operation, and more convenient to use.
[0035] As a preferred embodiment of the present invention, the coarse adjustment knob 400 is provided with two shift forks 420 along the axial direction of the limiting cylinder 100, and a sliding groove 410 is formed between the two shift forks 420. The end of the second sliding rod 700 is embedded between the two shift forks 420, and the bottom of the two shift forks 420 is embedded in the arc-shaped through groove 312.
[0036] Preferably, the inner circumference of the outer endoscope tube 300 is provided with a first positioning surface, the inner endoscope tube 200 slides axially within the outer endoscope tube 300 through the first positioning surface, and a first sealing ring 210 is provided between the inner endoscope tube 200 and the outer endoscope tube 300. The first sealing ring 210 is used for sealing and adjusting damping.
[0037] Preferred, see Figure 4The limiting cylinder 100 includes a first stepped portion 110 at the top and a second stepped portion 120 at the bottom. The diameter of the second stepped portion 120 is larger than the diameter of the first stepped portion 110. The top of the side adjustment seat 310 is provided with a first protrusion 320, and the first protrusion 320 is provided with an external thread. The inner circumference of the second stepped portion 120 is provided with an internal thread that mates with the external thread.
[0038] In some embodiments, see Figure 4 The inner circumference of the first stepped portion 110 is provided with a pressure ring 130, which is connected to the first stepped portion 110 by a thread. The outer circumference of the fine adjustment knob 500 is provided with a second protrusion 520, and the pressure ring 130 is pressed against the top of the second protrusion 520. A second sealing ring 530 is provided between the fine adjustment knob 500 and the first stepped portion 110. The second protrusion 520 is provided with a first annular groove 521 for installing the second sealing ring 530. The second sealing ring 530 is used to seal and adjust the damping during rotation. Preferably, the fine adjustment knob 500 is a cylindrical component, and the second protrusion 520 is located at the middle position of the fine adjustment knob 500.
[0039] See Figure 4 The coarse adjustment knob 400 is located at the bottom of the first stepped portion 110. The coarse adjustment knob 400 is located on the inner periphery of the first protrusion 320. The inner periphery of the first protrusion 320 forms a second positioning surface for fixing the coarse adjustment knob 400. A third sealing ring 430 is provided between the coarse adjustment knob 400 and the first protrusion 320. A second annular groove 440 for installing the third sealing ring 430 is provided on the outer periphery of the coarse adjustment knob 400. The third sealing ring 430 is used for sealing and adjusting the damping during rotation.
[0040] In a preferred embodiment of the present invention, the outer periphery of the endoscope tube 200 is provided with a threaded countersunk hole, the bottom of the first slide rod 600 and the bottom of the second slide rod 700 are both provided with external threads that cooperate with the threaded countersunk hole, and the top end face of the first slide rod 600 and the second slide rod 700 are both provided with a cross groove, which is used to screw the first slide rod 600 and the second slide rod 700 onto the endoscope tube 200.
[0041] Preferred, see Figure 4 , Figure 5 The coarse adjustment knob 400 is connected to a coarse adjustment lever 450 on its outer periphery. The coarse adjustment knob 400 has a groove for mounting the coarse adjustment lever 450 on its outer periphery. The groove is arc-shaped. Preferably, the groove and the lever fork 420 are arranged opposite to each other on both sides of the coarse adjustment knob 400.
[0042] As a preferred embodiment of this utility model, see Figure 2 The fine adjustment knob 500 has a fine adjustment handwheel 540 on its outer periphery. The fine adjustment handwheel 540 is located on the top of the fine adjustment knob 500, and the fine adjustment knob 500 and the fine adjustment handwheel 540 are connected by screws.
[0043] An embodiment of this utility model also provides a dual-field-of-view lens, including the focusing structure in any of the above embodiments, wherein a first lens is installed in the outer lens barrel 300 and a second lens is installed in the inner lens barrel 200.
[0044] The focusing method using this dual-field-of-view lens includes the following steps:
[0045] Step 1: At the short focal length, rotate the fine adjustment knob 500 to focus and find the subject. At this time, the positional relationship between the first slider 600 and the second slider 700 is as follows: Figure 7 As shown;
[0046] Step 2: Rotate the fine adjustment knob 500 to continuously increase the distance between the front end of the endoscope tube 200 and the front end of the outer endoscope tube 300 until the critical position (i.e., the first slide rod 600 just reaches the middle section of the S-shaped groove 510). At this time, the positional relationship between the first slide rod 600 and the second slide rod 700 is as follows: Figure 8 As shown, after reaching the critical position, push the coarse adjustment knob 400 to switch the short focal length to the long focal length (i.e., the first slider 600 is about to leave the middle position of the S-shaped groove 510). At this time, the positional relationship between the first slider 600 and the second slider 700 is as follows: Figure 9 As shown;
[0047] Step 3: At the telephoto end, rotate the fine adjustment knob 500 to focus on the subject. The positional relationship between the first slider 600 and the second slider 700 at this time is as follows: Figure 10 As shown.
[0048] In the description of this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0049] Of course, the present invention is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.
Claims
1. A focusing structure, characterized in that: The system includes a limiting cylinder, a coarse adjustment knob, a fine adjustment knob, a first slide rod, a second slide rod, an outer endoscope tube, and an inner endoscope tube coaxially arranged with the outer endoscope tube. A side adjustment seat is provided on the outer circumferential surface of the outer endoscope tube. The limiting cylinder is connected to the outer endoscope tube through the side adjustment seat and is perpendicular to the outer endoscope tube. The side adjustment seat has a straight through groove coaxially arranged with the outer endoscope tube and an arc-shaped through groove centered at the midpoint of the straight through groove. Both the fine adjustment knob and the coarse adjustment knob are installed inside the limiting cylinder and can rotate around it. The axial rotation of the fine adjustment knob is provided with an S-shaped groove at the bottom for providing the movement path of the first slide rod. One end of the first slide rod is connected to the endoscope tube, and the other end of the first slide rod passes through the straight through groove and is embedded in the S-shaped groove. The coarse adjustment knob is provided with a sliding groove for providing the movement path of the second slide rod. The sliding groove is arranged along the axial direction of the limiting cylinder. One end of the second slide rod is connected to the endoscope tube, and the other end of the second slide rod passes through the arc-shaped through groove and is embedded in the sliding groove.
2. The focusing structure according to claim 1, characterized in that: The coarse adjustment knob has two shift forks along the axial direction of the limiting cylinder, and the sliding groove is formed between the two shift forks. The end of the second slide rod is embedded between the two shift forks, and the bottom of the two shift forks is embedded in the arc-shaped through groove.
3. The focusing structure according to claim 1, characterized in that: The inner circumference of the outer endoscope tube is provided with a first positioning surface, and the inner endoscope tube slides axially within the outer endoscope tube through the first positioning surface. A first sealing ring is provided between the inner endoscope tube and the outer endoscope tube.
4. The focusing structure according to claim 1, characterized in that: The limiting cylinder includes a first stepped portion at the top and a second stepped portion at the bottom. The diameter of the second stepped portion is larger than the diameter of the first stepped portion. The top of the side adjustment seat is provided with a first protrusion, and the first protrusion is provided with an external thread. The inner circumference of the second stepped portion is provided with an internal thread that mates with the external thread.
5. The focusing structure according to claim 4, characterized in that: The inner circumference of the first stepped portion is provided with a pressure ring, which is connected to the first stepped portion by a thread. The outer circumference of the fine adjustment knob is provided with a second protrusion, and the pressure ring is pressed on the top of the second protrusion. A second sealing ring is provided between the fine adjustment knob and the first stepped portion, and a first annular groove for installing the second sealing ring is provided on the second protrusion.
6. The focusing structure according to claim 4, characterized in that: The coarse adjustment knob is located at the bottom of the first stepped portion and on the inner periphery of the first protrusion. The inner periphery of the first protrusion forms a second positioning surface for fixing the coarse adjustment knob. A third sealing ring is provided between the coarse adjustment knob and the first protrusion. A second annular groove for installing the third sealing ring is provided on the outer periphery of the coarse adjustment knob.
7. The focusing structure according to claim 1, characterized in that: The outer periphery of the endoscope tube is provided with a threaded countersunk hole, the bottom of the first slide rod and the bottom of the second slide rod are both provided with external threads that cooperate with the threaded countersunk hole, and the top end face of the first slide rod and the second slide rod are both provided with a cross groove.
8. The focusing structure according to claim 1, characterized in that: The coarse adjustment knob is connected to a coarse adjustment lever on its outer periphery, and a groove for mounting the coarse adjustment lever is provided on the outer periphery of the coarse adjustment knob.
9. The focusing structure according to claim 1, characterized in that: The fine adjustment knob is provided with a fine adjustment handwheel on its outer periphery. The fine adjustment handwheel is located on top of the fine adjustment knob, and the fine adjustment knob and the fine adjustment handwheel are connected by screws.
10. A dual-field-of-view lens, characterized in that: The system includes the focusing structure described in any one of claims 1 to 9, wherein a first lens is installed inside the outer lens barrel and a second lens is installed inside the inner lens barrel.