Lens focusing structure and infrared lens

Abstract

The utility model discloses a lens focusing structure and an infrared lens, the lens focusing structure comprises a pedestal, a focusing device, a fixed lens cone and an adjustable lens cone, the fixed lens cone is relatively fixedly installed on the pedestal, the adjustable lens cone is sleeved in the fixed lens cone, the focusing device is installed on the fixed lens cone, and the adjustable lens cone is sleeved in the adjustable lens cone. The focusing device rotates to drive the adjustable lens barrel to move axially, and an elastic piece is further arranged between the focusing device and the base and used for providing elastic abutting force in the axial direction for the focusing device. According to the utility model, the focusing device rotates to drive the adjustable lens cone to move axially, so that the lens on the adjustable lens cone moves, focusing is carried out, the elastic piece is arranged between the focusing device and the base, and an assembly gap between the focusing device and the base is eliminated through the elastic piece, so that the focusing effect is improved. Therefore, the installation stability among the components of the lens focusing structure is enhanced, and the optical axis of the lens is kept stable in the focusing process.

Description

Technical Field

[0001] The utility model relates to the technical field of optical equipment, in particular to a lens focusing structure and an infrared lens. Background Art

[0002] As an important component of thermal imaging products, the performance of infrared lens directly affects the effect of thermal imaging products. The reliability of the lens focusing mechanism has a great impact on the aiming performance of thermal imaging products.

[0003] Due to the application scenarios of infrared lenses, high consistency is required for the optical axis of the lens. The focusing structure of the lens is complex and has many parts. In addition, the lens needs to be focused to achieve clear imaging in different application scenarios. Because the structure is adjustable, there will be gap problems in the assembly of parts. However, the gap will cause the optical axis of the lens to be unstable, affecting the aiming function of the thermal imaging product.

[0004] Therefore, how to eliminate the assembly gap of the lens focusing structure and ensure the optical axis stability of the lens is a technical problem that needs to be solved by those skilled in the art. Utility Model Content

[0005] The utility model provides a lens focusing structure and an infrared lens, which are used to solve the technical problem that the assembly gap between the lens focusing structures causes the instability of the lens optical axis.

[0006] To achieve the above-mentioned objectives, in a first aspect, the utility model provides a lens focusing structure, comprising a base, a focusing device, a fixed lens barrel and an adjustable lens barrel, wherein the fixed lens barrel is relatively fixedly mounted on the base, the adjustable lens barrel is sleeved in the fixed lens barrel, the focusing device is mounted on the fixed lens barrel, the focusing device rotates to drive the adjustable lens barrel to move axially, and an elastic member is further provided between the focusing device and the base, the elastic member being used to provide an elastic pressing force along the axial direction to the focusing device.

[0007] As a further improvement of the above technical solution:

[0008] The focusing device includes a focusing hand wheel, a threaded adapter and a guide structure, the threaded adapter is sleeved on the fixed lens barrel, the focusing hand wheel is sleeved on the threaded adapter and is threadedly connected to the threaded adapter, one end face of the focusing hand wheel abuts the elastic member, and the other end face abuts the fixed lens barrel, the focusing hand wheel rotates to drive the threaded adapter to move in the axial direction, and the threaded adapter and the adjustable lens barrel are guided and linked in the axial direction through the guide structure.

[0009] As a further improvement of the above technical solution:

[0010] The fixed lens barrel is provided with a plurality of strip-shaped through holes, and the guide structure comprises guide pins arranged corresponding to the through holes; one end of the guide pin is fixedly connected to the threaded adapter, and the other end passes through the through hole and is fixedly connected to the adjustable lens barrel.

[0011] As a further improvement of the above technical solution:

[0012] The adjustable lens barrel is provided with a lens barrel threaded hole, the threaded adapter is provided with an adapter threaded through hole corresponding to the lens barrel threaded hole, and the guide pin spirally enters the adapter threaded through hole and passes through the through hole to be threadedly connected with the adjustable lens barrel.

[0013] As a further improvement of the above technical solution:

[0014] The guide pin is provided with a positioning step. When the guide pin spirally enters the threaded through hole of the adapter, the entry amount of the guide pin is limited by the positioning step.

[0015] As a further improvement of the above technical solution:

[0016] The focusing hand wheel is provided with a circle of annular protrusions, one end face of the annular protrusion abuts against one end face of the elastic member, the other end face of the elastic member is arranged on the base, the inner circle of the elastic member abuts against the fixed lens barrel, and the elastic member is used to eliminate the gap between the base, the focusing hand wheel and the fixed lens barrel.

[0017] As a further improvement of the above technical solution:

[0018] The elastic member is a wave spring.

[0019] As a further improvement of the above technical solution:

[0020] The wave spring is provided with a plurality of through holes, and the base is provided with cylinders corresponding one to one with the through holes on the wave spring, and the cylinders are used for positioning the wave spring and limiting the radial movement of the wave spring.

[0021] As a further improvement of the above technical solution:

[0022] The fixed lens barrel is fixed on the base by fastening screws.

[0023] In a second aspect, the utility model further provides an infrared lens, comprising an infrared lens and the lens focusing structure described in the first aspect, wherein the infrared lens is installed in the adjustable lens barrel.

[0024] The utility model has the following beneficial effects:

[0025] In the above embodiment, the focusing device is rotated to drive the adjustable lens barrel to move axially, so that the lens on the adjustable lens barrel is moved, thereby focusing is performed, and an elastic member is also provided between the focusing device and the base. The elastic member provides an elastic pressure along the axial direction to the focusing device, which can eliminate the assembly gap between the focusing device and the base, thereby enhancing the installation stability between the components of the lens focusing structure and ensuring that the optical axis of the lens remains stable during the focusing process.

[0026] In the above embodiments, the infrared lens and the corresponding lens focusing structure embodiments belong to the same concept, and thus have the same technical effects as the corresponding lens focusing structure embodiments, which will not be described in detail herein.

[0027] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 This is an exploded view of a lens focusing structure according to an embodiment of the present utility model;

[0030] Figure 2 It is a cross-sectional view of a lens focusing structure according to an embodiment of the present utility model.

[0031] The reference numerals are as follows:

[0032] 1. Base; 11. Cylinder; 2. Focusing device; 21. Focusing hand wheel; 211. Annular protrusion; 22. Threaded adapter; 221. Threaded through hole of adapter; 23. Guide pin; 3. Fixed lens barrel; 31. Through hole; 4. Adjustable lens barrel; 41. Threaded hole of lens barrel; 5. Elastic member; 6. Fastening screw. DETAILED DESCRIPTION

[0033] The following is a further detailed description of the technical solution of the utility model in conjunction with the accompanying drawings and specific embodiments of the specification. In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application should be the usual meanings understood by ordinary technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate relative directions or positional relationships, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The words "one", "one" or "the" and similar words used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The words “include” or “comprising” and the like used in the description of this application mean that the elements or objects preceding the words include the elements or objects listed after the words and their equivalents, but do not exclude other elements or objects.

[0034] It should also be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection 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, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0035] like Figure 1 and Figure 2As shown, the lens focusing structure of this embodiment includes a base 1, a focusing device 2, a fixed lens barrel 3 and an adjustable lens barrel 4. The fixed lens barrel 3 is relatively fixedly mounted on the base 1, the adjustable lens barrel 4 is sleeved in the fixed lens barrel 3, the focusing device 2 is mounted on the fixed lens barrel 3, the focusing device 2 rotates to drive the adjustable lens barrel 4 to move axially, and an elastic member 5 is further provided between the focusing device 2 and the base 1, and the elastic member 5 is used to provide an elastic pressure in the axial direction to the focusing device 2. In the lens focusing structure, the focusing device 2 rotates to drive the adjustable lens barrel 4 to move axially to achieve focusing. By providing the elastic member 5 between the focusing device 2 and the base 1, during the process of axial movement of the adjustable lens barrel 4 for focusing, the elastic member 5 can provide an elastic pressure in the axial direction to the focusing device 2, eliminating the assembly gap between the focusing device 2 and the base 1, thereby enhancing the installation stability between the components of the lens focusing structure and ensuring that the optical axis of the lens remains stable during the focusing process.

[0036] Among them, the adjustable lens barrel 4 is used to install the lens, and the fixed lens barrel 3 is relatively fixedly installed on the base 1. Specifically, in this embodiment, the fixed lens barrel 3 passes through the base 1 through the fastening screw 6 and is threadedly connected to the fixed lens barrel 3, so that the fixed lens barrel 3 is fixed on the base 1. The focusing device 2 is installed on the fixed lens barrel 3 and connected to the adjustable lens barrel 4. By rotating the focusing device 2, the adjustable lens barrel 4 can be driven to move axially, thereby moving the lens on the adjustable lens barrel 4 to realize the lens focusing function. At the same time, an elastic member 5 is arranged between the focusing device 2 and the base 1. The elastic member 5 is used to provide an elastic resisting force along the axial direction to the focusing device 2 and eliminate the axial gap between the focusing device 2 and the base 1, thereby enhancing the installation stability of the lens focusing structure and ensuring that the optical axis of the lens remains stable during the focusing process.

[0037] Optionally, the focusing device 2 includes a focusing hand wheel 21, a threaded adapter 22 and a guide structure, the threaded adapter 22 is sleeved on the fixed lens barrel 3, the focusing hand wheel 21 is sleeved on the threaded adapter 22 and is threadedly connected to the threaded adapter 22, one end face of the focusing hand wheel 21 abuts against the elastic member 5, and the other end face abuts against the fixed lens barrel 3, the focusing hand wheel 21 rotates to drive the threaded adapter 22 to move in the axial direction, and the threaded adapter 22 and the adjustable lens barrel 4 are guided and linked in the axial direction through the guide structure.

[0038] Among them, the threaded adapter 22 is sleeved on the fixed lens barrel 3, the focusing hand wheel 21 is sleeved on the threaded adapter 22 and threadedly connected with the threaded adapter 22, one end face of the focusing hand wheel 21 abuts the elastic member 5, and the other end face abuts the fixed lens barrel 3. Since the end faces of both ends of the focusing hand wheel 21 are restricted, when the focusing hand wheel 21 is rotated, the focusing hand wheel 21 will not generate axial movement, and only the threaded adapter 22 will move in the axial direction. The threaded adapter 22 and the adjustable lens barrel 4 are guided and linked in the axial direction through the guide structure, so that when the threaded adapter 22 moves in the axial direction, the adjustable lens barrel 4 is driven to move together.

[0039] Specifically, in order to enable the threaded adapter 22 to drive the adjustable lens barrel 4 to move together when it moves in the axial direction, in the present embodiment, a plurality of strip-shaped through holes 31 are provided on the fixed lens barrel 3, and the guide structure includes guide pins 23 arranged corresponding to the through holes 31; one end of the guide pin 23 is fixedly connected to the threaded adapter 22, and the other end passes through the through hole 31 and is fixedly connected to the adjustable lens barrel 4.

[0040] There are specifically three through holes 31 in the present embodiment. In other embodiments, any number of through holes 31 can be selected according to actual needs. The through holes 31 are holes with a long strip-shaped cross-section, so that the guide pin 23 can move in the through holes 31. One end of the guide pin 23 is fixedly connected to the threaded adapter 22, and the other end passes through the through hole 31 and is fixedly connected to the adjustable lens barrel 4, so that when the threaded adapter 22 moves in the axial direction, the adjustable lens barrel 4 is driven to move together.

[0041] Optionally, a lens barrel threaded hole 41 is provided on the adjustable lens barrel 4, and an adapter threaded through hole 221 corresponding to the lens barrel threaded hole 41 is provided on the threaded adapter 22. After the guide pin 23 is screwed into the adapter threaded through hole 221, it passes through the through hole 31 and enters the lens barrel threaded hole 41, so that the two ends of the guide pin 23 are threadedly connected to the threaded adapter 22 and the adjustable lens barrel 4 respectively.

[0042] Optionally, a positioning step is provided on the guide pin 23, and when the guide pin 23 is screwed into the threaded through hole 221 of the adapter, the entry amount of the guide pin 23 is limited by the positioning step.

[0043] Specifically, a step corresponding to the positioning step is also provided inside the adapter threaded through hole 221. When the guide pin 23 screws into the adapter threaded through hole 221, when the positioning step of the adapter threaded through hole 221 collides with the step inside the adapter threaded through hole 221, the guide pin 23 cannot continue to enter, thereby limiting the entry amount of the guide pin 23, preventing the guide pin 23 from completely entering the adapter threaded through hole 221 and causing subsequent disassembly difficulties, and at the same time preventing the guide pin 23 from entering too deeply and causing damage to the adjustable lens barrel 4.

[0044] Optionally, a circle of annular protrusions 211 are provided on the focusing hand wheel 21, and one end face of the annular protrusion 211 abuts against one end face of the elastic member 5, and the other end face of the elastic member 5 is arranged on the base 1, and the inner circle of the elastic member 5 abuts against the fixed lens barrel 3. The elastic member 5 is used to eliminate the gap between the base 1, the focusing hand wheel 21 and the fixed lens barrel 3. A circle of annular protrusions 211 are provided on the focusing hand wheel 21, so that one end face of the annular protrusion 211 can be located on the elastic member 5, and the other end face can limit the axial displacement of the threaded adapter 22, and the focusing hand wheel 21 below the annular protrusion 211 is sleeved on the base 1, so that the focusing hand wheel 21 is sleeved on the base 1 and the fixed lens barrel 3 at the same time, so that the end of the fixed lens barrel 3 close to the base 1 is closed.

[0045] Optionally, the elastic member 5 is a wave spring. Compared with ordinary elastic members, the wave spring has the characteristics of light weight, small installation space and good elasticity. It is easy to assemble in this embodiment and meets the requirement of eliminating the gap between the base 1, the focusing hand wheel 21 and the fixed lens barrel 3.

[0046] Optionally, the wave spring is provided with a plurality of through holes, and the base 1 is provided with cylinders 11 corresponding one to one with the through holes on the wave spring, and the cylinders 11 are used to position the wave spring and limit radial movement of the wave spring.

[0047] The assembly process of the lens focusing structure of this embodiment is as follows: the adjustable lens barrel 4 is arranged in the fixed lens barrel 3, the threaded adapter 22 is sleeved on the fixed lens barrel 3, and the through hole 31 of the fixed lens barrel 3, the adapter threaded through hole 221 on the threaded adapter 22 and the lens barrel threaded hole 41 of the adjustable lens barrel 4 are aligned, and then the guide pin 23 enters the adapter threaded through hole 221 and then passes through the through hole 31 into the lens barrel threaded hole 41 until the positioning step of the guide pin 23 is stuck in the through hole 31, and then the focusing hand wheel 21 is sleeved on the threaded adapter 22, so that the internal thread on the inner side of the focusing hand wheel 21 is threadedly connected with the external thread on the outer surface of the threaded adapter 22, a wave spring is arranged on the cylinder 11 of the base 1, and finally the fixed lens barrel 3 is inserted along the inner side of the wave spring until one end face of the annular protrusion 211 of the focusing hand wheel 21 abuts against the wave spring and stops.

[0048] The lens focusing structure of this embodiment eliminates the gaps between the base 1, the focusing hand wheel 21 and the fixed lens barrel 3, thereby ensuring the stability of the optical axis of the product, improving the processing yield of the structural parts and reducing the cost.

[0049] On the other hand, the embodiment of the present application further provides an infrared lens including the lens focusing structure of the embodiment of the present application, the infrared lens also includes an infrared lens, and the infrared lens is installed in the adjustable lens barrel 4.

[0050] When the adjustable lens barrel 4 moves axially, the infrared lens is driven to move together, thereby realizing lens focusing, and the infrared lens structure is more stable, ensuring the stability of the optical axis during focusing.

[0051] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A lens focusing structure, characterized in that: The invention comprises a base (1), a focusing device (2), a fixed lens barrel (3) and an adjustable lens barrel (4); the fixed lens barrel (3) is relatively fixedly mounted on the base (1); the adjustable lens barrel (4) is sleeved in the fixed lens barrel (3); the focusing device (2) is mounted on the fixed lens barrel (3); the focusing device (2) rotates to drive the adjustable lens barrel (4) to move axially; an elastic member (5) is also provided between the focusing device (2) and the base (1); the elastic member (5) is used to provide an elastic pressing force along the axial direction to the focusing device (2).

2. The lens focusing structure according to claim 1, characterized in that: The focusing device (2) comprises a focusing hand wheel (21), a threaded adapter (22) and a guide structure; the threaded adapter (22) is sleeved on the fixed lens barrel (3); the focusing hand wheel (21) is sleeved on the threaded adapter (22) and is threadedly connected to the threaded adapter (22); one end surface of the focusing hand wheel (21) abuts against the elastic member (5) and the other end surface abuts against the fixed lens barrel (3); the focusing hand wheel (21) rotates to drive the threaded adapter (22) to move in an axial direction; and the threaded adapter (22) and the adjustable lens barrel (4) are guided and linked in an axial direction through the guide structure.

3. The lens focusing structure according to claim 2, characterized in that: The fixed lens barrel (3) is provided with a plurality of strip-shaped through holes (31), and the guide structure comprises guide pins (23) arranged corresponding to the through holes (31); one end of the guide pin (23) is fixedly connected to the threaded adapter (22), and the other end passes through the through holes (31) and is fixedly connected to the adjustable lens barrel (4).

4. The lens focusing structure according to claim 3, characterized in that: The adjustable lens barrel (4) is provided with a lens barrel threaded hole (41), the threaded adapter (22) is provided with an adapter threaded through hole (221) corresponding to the lens barrel threaded hole (41), and the guide pin (23) is screwed into the adapter threaded through hole (221) and then passes through the through hole (31) to be threadedly connected to the adjustable lens barrel (4).

5. The lens focusing structure according to claim 4, characterized in that: The guide pin (23) is provided with a positioning step, and when the guide pin (23) is screwed into the threaded through hole (221) of the adapter, the entry amount of the guide pin (23) is limited by the positioning step.

6. The lens focusing structure according to claim 2, characterized in that: The focusing hand wheel (21) is provided with a circle of annular protrusions (211), one end surface of the annular protrusion (211) abuts against one end surface of the elastic member (5), the other end surface of the elastic member (5) is arranged on the base (1), the inner circle of the elastic member (5) abuts against the fixed lens barrel (3), and the elastic member (5) is used to eliminate the gap between the base (1), the focusing hand wheel (21) and the fixed lens barrel (3).

7. The lens focusing structure according to claim 1, characterized in that: The elastic member (5) is a wave spring.

8. The lens focusing structure according to claim 7, characterized in that: The wave spring is provided with a plurality of through holes, and the base (1) is provided with cylinders (11) corresponding one to one with the through holes on the wave spring, and the cylinders (11) are used to position the wave spring and limit radial movement of the wave spring.

9. The lens focusing structure according to claim 1, characterized in that: The fixed lens barrel (3) is fixed to the base (1) by means of a fastening screw (6).

10. An infrared lens, characterized in that: It comprises an infrared lens and a lens focusing structure as claimed in any one of claims 1 to 9, wherein the infrared lens is installed in the adjustable lens barrel (4).

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