Manual lens adjusting mechanism

Abstract

The utility model relates to the field of optical equipment, and discloses a manual lens adjusting mechanism, which comprises a lens moving coil, a threaded moving coil, a focusing ring and a limiting structure, and is characterized in that the lens moving coil is used for mounting a lens, and the lens moving coil is fixedly connected with the threaded moving coil; the inner side face of the focusing ring is provided with a first thread, the outer side face of the threaded moving ring is provided with a second thread matched with the first thread, and the limiting structure is used for limiting rotation of the threaded moving ring. And the focusing ring rotates to enable the threaded moving ring to move along the axial direction of the focusing ring. When the focal length of the lens is adjusted, the focusing ring is rotated, so that the threaded moving ring drives the lens to move along the axial direction of the focusing ring, and the focal length of the lens can be adjusted.

Description

Technical Field

[0001] The utility model relates to the field of optical equipment, in particular to the field of infrared thermal imagers, and specifically to a manual lens adjustment mechanism. Background Art

[0002] With the rapid development of industrial automation, machine vision has been widely used in production and manufacturing, quality inspection, logistics, medicine, scientific research and other fields. The objective lens assembly is a key part of the target calibration mirror. During use, the objective lens needs to be moved back and forth to complete the focusing work.

[0003] In the prior art, lens focal length adjustment mechanisms include guide pin threads, three-petal threads, cam knobs, etc. The guide pin thread adjustment method must use double-thread threads, and the friction between the guide pin and the thread is large, which affects the adjustment accuracy. The three-petal thread adjustment method solves the problem of guide pin thread adjustment to a certain extent, but its processing is complicated and the cost is high. The lens body needs to be slotted into a trident shape, which has a large deformation and also affects the adjustment accuracy. In addition, the trident-shaped lens body structure limits the shape of the lens. Utility Model Content

[0004] In view of the defects and shortcomings of the prior art, the utility model provides a manual lens adjustment mechanism.

[0005] A manual adjustment mechanism for a lens comprises a lens movable coil, a threaded movable coil, a focus ring and a limiting structure, wherein the lens movable coil is used to install a lens, and the lens movable coil and the threaded movable coil are fixedly connected; a first thread is provided on the inner side surface of the focus ring, a second thread matched with the first thread is provided on the outer side surface of the threaded movable coil, and the limiting structure is used to limit the rotation of the threaded movable coil; the focus ring rotates to allow the threaded movable coil to move along the axial direction of the focus ring.

[0006] Preferably, it also includes a mirror body, which includes a limiting portion; the limiting structure includes a sliding groove and a limiting screw, the sliding groove is opened on the limiting portion along the axial direction of the mirror body, a threaded hole 1 is opened on the lens moving circle, and a threaded hole 2 is opened on the threaded moving circle, the threaded end of the limiting screw is threadedly connected to the threaded hole 1 and the threaded hole 2 at the same time, and the limiting screw is slidably connected in the sliding groove.

[0007] Preferably, the first thread and the second thread are both trapezoidal threads.

[0008] Preferably, the lens dynamic coil, the limiting portion, the threaded dynamic coil, and the focusing ring are arranged in sequence from the inside to the outside.

[0009] Preferably, the mirror body further includes a base, and the limiting portion is fixedly connected to the base.

[0010] Preferably, a lens adapter is further included, and the lens adapter is fixedly connected to an end of the limiting portion away from the base.

[0011] Preferably, sealing members are provided at both ends of the focus ring.

[0012] Preferably, it also includes a focusing rubber bag, and the focusing rubber bag is arranged on the focusing ring.

[0013] Preferably, a limiting groove is provided in the focusing rubber bag, and a limiting strip adapted to the limiting groove is provided on the outer side of the focusing ring.

[0014] Compared with the prior art, the utility model has the following obvious beneficial effects:

[0015] (1) When adjusting the focal length of the lens, turn the focus ring, and the rotation of the threaded movable coil is limited by the cooperation of the slide groove and the limit screw. When the focus ring is turned, the threaded movable coil drives the lens to move along the axial direction of the focus ring, and the focal length of the lens can be adjusted. The lens movable coil and the threaded movable coil are connected by thread cooperation, which is convenient for adjusting the focal length of the lens. The thread processing technology is simple, the processing precision is high, the processing cost is low, and the production and assembly are simple.

[0016] (2) Trapezoidal threads are suitable for smooth transmission and can effectively solve the problem of poor turning sensation of the threaded moving coil and focusing ring when adjusting the focal length. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the explosion structure of Example 1 of the utility model;

[0018] Figure 2 This is a schematic diagram of the overall structure of Example 1 of the utility model.

[0019] Explanation of reference numerals: 1. lens body; 101. limiting part; 102. base; 2. lens moving coil; 3. threaded moving coil; 4. focusing ring; 5. lens adapter; 6. focusing rubber bag; 7. limiting structure; 701. slide groove; 702. limiting screw; 8. thread one; 9. thread two; 10. threaded hole one; 11. threaded hole two; 12. sealing element; 13. limiting groove; 14. limiting strip. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, they will be described in detail below in conjunction with specific examples, but the protection scope of the present invention is not limited to the following specific embodiments.

[0021] Unless otherwise defined, all professional terms used below have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present utility model.

[0022] Embodiment 1:

[0023] A manual lens adjustment mechanism, referring to Figure 1 and Figure 2 , including a lens body 1, a lens moving coil 2, a thread moving coil 3, a focus ring 4 and a limiting structure 7. The lens moving coil 2 is used to install the lens, and the lens moving coil 2 and the thread moving coil 3 are fixedly connected; a thread 1 8 is provided on the inner side of the focus ring 4, and a thread 2 9 adapted to the thread 1 8 is provided on the outer side of the thread moving coil 3. The limiting structure 7 is used to limit the rotation of the thread moving coil 3; the focus ring 4 rotates to make the thread moving coil 3 move along the axial direction of the focus ring 4. The lens moving coil 2, the thread moving coil 3, and the focus ring 4 are sequentially arranged from the inside to the outside.

[0024] Reference Figure 1 The adjustment mechanism also includes a mirror body 1, which includes a limiting portion 101 and a base 102, and the limiting portion 101 and the base 102 are fixedly connected. The limiting structure 7 includes a slide groove 701 and a limiting screw 702. The slide groove 701 is provided on the limiting portion 101 along the axial direction of the mirror body 1. The slide groove 701 is a straight groove, and arc portions adapted to the limiting screw 702 are provided at both ends of the slide groove 701. A threaded hole 10 is provided on the lens moving coil 2, and a threaded hole 2 11 is provided on the threaded moving coil 3. The threaded end of the limiting screw 702 is threadedly connected to the threaded hole 10 and the threaded hole 2 11 at the same time, and the limiting screw 702 is slidably connected to the slide groove 701.

[0025] In the embodiment of the utility model, the slide groove 701, the threaded hole 10, the threaded hole 2 11, and the limit screw 702 are symmetrically arranged in two groups. In other embodiments, they can also be arranged in one group, or in three or four groups at intervals along the circumferential direction of the threaded moving coil 3. The number of settings can be selected according to actual needs.

[0026] Preferably, the limit screw 702 is a headless shoulder screw. After the limit screw 702 is installed in the threaded hole 10 and the threaded hole 2 11, the two ends of the limit screw 702 are respectively located in the threaded hole 10 and the threaded hole 2 11, so as to avoid interference between the limit screw 702 and the focusing ring 4 and avoid affecting the installation of the lens.

[0027] When adjusting the focal length of the lens, the focus ring 4 is rotated, and the rotation of the threaded movable coil 3 is limited by the cooperation of the slide groove 701 and the limit screw 702. When the focus ring 4 is rotated, the threaded movable coil 3 drives the lens to move along the axial direction of the focus ring 4, so that the focal length of the lens can be adjusted. The lens movable coil 2 and the lens body 1 are connected by threaded cooperation, which is convenient for adjusting the focal length of the lens, and the thread processing technology is simple, the processing precision is high, the processing cost is low, and the production and assembly are simple.

[0028] Preferably, thread one 8 and thread two 9 are trapezoidal threads, and thread one 8 is also an adapted trapezoidal thread. The inventor uses trapezoidal threads to effectively solve the problem of poor twisting feeling of the threaded movable coil 3 and the focusing ring 4 when adjusting the focal length.

[0029] Reference Figure 1 and Figure 2 The adjustment mechanism further includes a lens adapter 5, which is used to install the adjustment mechanism on the device body. The lens adapter 5 is fixedly connected to the end of the limiting portion 101 away from the base 102. In a specific embodiment of the utility model, the connection method of the lens adapter 5 and the base 102 is a threaded connection. In other embodiments, the connection method of the lens adapter 5 and the base 102 can be a common fixing method such as plug-in, pin fixing, and bonding.

[0030] Reference Figure 1 and Figure 2 In order to improve the waterproof effect, seals 12 are provided at both ends of the focus ring 4. In a specific embodiment of the present invention, a mounting groove 1 is provided on the outer side of the base, and a seal 12 is installed in the mounting groove 1. A mounting groove 2 is provided on the outer side of the lens adapter 5, and another seal 12 is installed in the mounting groove 2 to achieve sealing of the focus ring 4. In other embodiments, the mounting groove 1 and the mounting groove 2 can be provided on the outer wall of the focus ring 4.

[0031] Reference Figure 1 In order to facilitate the rotation of the focus ring 4, a focus rubber bag 6 is also included, and the focus rubber bag 6 is sleeved on the adjustment ring. A limit groove 13 is provided in the focus rubber bag 6, and a limit strip 14 adapted to the limit groove 13 is fixedly connected to the outside of the focus ring 4, which is convenient for installing the focus rubber bag 6, and can increase the contact area and increase the friction. During the processing, the limit strip 14 can be integrally formed with the focus ring 4.

[0032] In the embodiment of the utility model, the limiting strips 14 and the limiting grooves 13 are correspondingly arranged in multiple groups and are arranged at intervals along the axial direction of the focusing rubber bag 6, so as to further increase the contact area between the focusing rubber bag 6 and the focusing ring 4.

[0033] In other embodiments, the limiting strip 14 is disposed on the focusing rubber bag 6, and the limiting groove 13 is opened on the outer wall of the focusing ring 4. Alternatively, the focusing rubber bag 6 and the focusing ring 4 are bonded with glue.

[0034] The above embodiments are only preferred specific implementation methods of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope of the present invention according to the technical solution and concept of the present invention, which should be included in the protection scope of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present utility model, unless otherwise clearly specified and limited, the first feature "above" or "below" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. It should be noted that when an element is referred to as "fixed to" or "set on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

Claims

1. A manual lens adjustment mechanism, characterized in that: The invention comprises a lens moving coil (2), a thread moving coil (3), a focus ring (4) and a limiting structure (7); the lens moving coil (2) is used for installing a lens; the lens moving coil (2) and the thread moving coil (3) are fixedly connected; a thread 1 (8) is provided on the inner side surface of the focus ring (4); a thread 2 (9) matched with the thread 1 (8) is provided on the outer side surface of the thread moving coil (3); the limiting structure (7) is used for limiting the rotation of the thread moving coil (3); the focus ring (4) rotates so that the thread moving coil (3) moves along the axial direction of the focus ring (4).

2. The manual lens adjustment mechanism according to claim 1, characterized in that: It also includes a mirror body (1), the mirror body (1) includes a limiting portion (101); the limiting structure (7) includes a slide groove (701) and a limiting screw (702), the slide groove (701) is opened on the limiting portion (101) along the axial direction of the mirror body (1), the lens dynamic ring (2) is provided with a threaded hole one (10), the threaded dynamic ring (3) is provided with a threaded hole two (11), the threaded end of the limiting screw (702) is threadedly connected to the threaded hole one (10) and the threaded hole two (11) at the same time, and the limiting screw (702) is slidably connected in the slide groove (701).

3. The manual lens adjustment mechanism according to claim 1 or 2, characterized in that: The first thread (8) and the second thread (9) are both trapezoidal threads.

4. The manual lens adjustment mechanism according to claim 2, characterized in that: The lens moving coil (2), the limiting portion (101), the threaded moving coil (3), and the focus ring (4) are arranged in sequence from the inside to the outside.

5. The manual lens adjustment mechanism according to claim 2, characterized in that: The mirror body (1) further comprises a base (102), and the limiting portion (101) and the base (102) are fixedly connected.

6. The manual lens adjustment mechanism according to claim 5, characterized in that: It also comprises a lens adapter seat (5), wherein the lens adapter seat (5) is fixedly connected to an end of the limiting portion (101) away from the base portion (102).

7. The manual lens adjustment mechanism according to claim 1, characterized in that: Sealing members (12) are provided at both ends of the focus adjustment ring (4).

8. The manual lens adjustment mechanism according to claim 1, characterized in that: It also includes a focusing rubber bag (6), and the focusing rubber bag (6) is sleeved on the focusing ring (4).

9. The manual lens adjustment mechanism according to claim 8, characterized in that: A limiting groove (13) is provided in the focusing rubber bag (6), and a limiting strip (14) adapted to the limiting groove (13) is provided on the outer side of the focusing ring (4).

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