A lens fixing device, a lens unit, and a thermal imaging camera

Abstract

This utility model discloses a lens fixing device, a lens unit, and a thermal imaging camera, relating to the field of camera lens technology. The lens fixing device includes a lens mount, a locking nut, an elastic clip, and an elastic element. The lens mount has a raised outer ring with external threads on its outer wall and a tapered surface with a gradually decreasing diameter on its inner wall. The locking nut has a lens hole and an internal thread that engages with the external threads. The elastic clip is located between the lens mount and the locking nut, and includes a fixing ring and multiple spring pieces connecting to the fixing ring. The fixing ring abuts against the locking nut. The sidewalls of the spring pieces abut against the inner wall of the outer ring. The elastic element is located inside the outer ring, and the lower end of the spring pieces abuts against the elastic element. This lens fixing device can achieve self-centering and clamping fixation of the lens. Furthermore, the external threads used for locking are conventional threads, reducing manufacturing difficulty and defect rate. Simultaneously, the fine debris generated during thread engagement will not fall into the detector and affect the image.

Description

Technical Field

[0001] This utility model relates to the field of camera lens technology, and in particular to a lens fixing device, a lens unit, and a thermal imaging camera. Background Technology

[0002] like Figure 1 The existing thermal imaging lenses shown typically use precision optical fine-pitch threads to fix the lens 30 to the slotted lens mount 10. To prevent loosening during use, a clamp 20 is usually used to lock it in place externally. Precision optical fine-pitch threads have a small pitch and require high machining accuracy. However, the threads of the lens and the slotted lens mount are usually manufactured by different companies, which can easily lead to poor thread tightness matching, affecting the lens's fixation. Furthermore, during the thread engagement between the lens and the slotted lens mount, lint is easily generated. This lint falls onto the detector and can easily form black spots on the image, affecting image quality.

[0003] Therefore, existing methods for fixing thermal imaging lenses suffer from high precision requirements in thread machining, high manufacturing difficulty, and the problem of chip shedding during thread engagement. Utility Model Content

[0004] To solve the above-mentioned technical problems, the purpose of this utility model is achieved through the following technical solution.

[0005] A lens fixing device is provided, including a lens mount, a locking nut, an elastic clip, and an elastic element;

[0006] The lens mount is provided with a raised outer ring, the outer wall of which is provided with an external thread, and the inner wall is a tapered surface with a gradually decreasing diameter;

[0007] The locking nut is provided with a lens hole and an internal thread on its inner side that is screwed into the external thread on the outer wall of the outer convex ring;

[0008] The elastic clip is located between the lens mount and the locking nut, and includes a fixing ring and multiple spring pieces connecting the fixing ring; the fixing ring abuts against the locking nut; the side wall of the spring piece abuts against the inner wall of the outer convex ring;

[0009] The elastic element is located on the inner side of the outer convex ring, and the lower end of the spring sheet abuts against the elastic element.

[0010] Furthermore, the lens mount is also provided with an inner convex ring, which is located inside the outer convex ring; there is a receiving groove between the outer convex ring and the inner convex ring, and the elastic element is located in the receiving groove.

[0011] Preferably, the elastic element is a wave spring or a butterfly spring.

[0012] Furthermore, the lens mount includes a base plate, and the outer convex ring and the inner convex ring are disposed on the base plate.

[0013] Furthermore, the base plate is provided with an assembly hole, which is located at the bottom of the inner convex ring.

[0014] Preferably, the fixing ring is connected to a plurality of equally spaced spring pieces.

[0015] Furthermore, the inner side of the locking nut is provided with a protruding abutment portion, and the retaining ring abuts against the abutment portion.

[0016] Preferably, the abutting portion is located at the top of the inner side of the locking nut.

[0017] This utility model also provides a lens unit, including a thermal imaging lens and the above-mentioned lens fixing device; the thermal imaging lens is sleeved in an elastic clip, and the spring abuts against the thermal imaging lens.

[0018] This utility model also provides a thermal imaging camera, including a detector and the above-mentioned lens unit, wherein the lens unit is disposed on the detector.

[0019] The lens fixing device of this utility model, during installation, by tightening the locking nut, the elastic clamp presses the elastic element downward, and at the same time, the spring piece of the elastic clamp moves towards the center under the action of the conical surface of the inner wall of the outer convex ring, so that the lens automatically centers and holds the lens tightly, thus realizing the self-centering and fixing of the lens; during disassembly, by loosening the locking nut, the lens is given an upward elastic force under the elastic force of the elastic element, thereby loosening the lens.

[0020] The lens fixing device of this utility model can achieve self-centering and clamping fixation of the lens by changing the structural design. In addition, the external thread for locking is a conventional thread with low machining accuracy requirements, which can reduce the difficulty of production and processing and the defect rate. At the same time, the fine debris generated by the thread engagement will not fall into the detector and affect the image. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This refers to the existing thermal imaging lens described in the background section of this utility model.

[0023] Figure 2 This is a structural diagram of the lens unit in Embodiment 1 of this utility model.

[0024] Figure 3 This is an exploded view of the lens unit in Embodiment 1 of this utility model.

[0025] Figure 4 This is a cross-sectional view of the lens unit in Embodiment 1 of this utility model.

[0026] Figure 5 This is a structural diagram of the thermal imaging camera in Embodiment 2 of this utility model.

[0027] Explanation of the markings in the image:

[0028] 10 - Slotted lens mount; 20 - Clamp; 30 - Lens.

[0029] 1-Lens mount; 11-Base plate; 12-Outer convex ring; 13-Inner convex ring; 14-Receiving groove; 15-External thread; 16-Conical surface; 17-Screw hole; 18-Assembly hole; 2-Locking nut; 3-Elastic clamp; 31-Fixing ring; 32-Spring; 4-Elastic element; 5-Thermal imaging lens; 6-Detector. Detailed Implementation

[0030] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0031] It should be noted that, as described in the specification or claims of this utility model, the upper end / top end of a component refers to the end of the component that is closer to the thermal imaging lens, and the lower end / rear end refers to the end of the component that is farther away from the thermal imaging lens.

[0032] Example 1

[0033] Please see Figures 2 to 4 The lens unit shown includes a thermal imaging lens 5 and a lens fixing device.

[0034] The lens fixing device includes a lens mount 1, a locking nut 2, an elastic clip 3, and an elastic element 4, with the elastic clip 3 and the elastic element 4 located between the lens mount 1 and the locking nut 2.

[0035] The lens mount includes a base plate 11, an outer convex ring 12, and an inner convex ring 13. The outer convex ring 12 and the inner convex ring 13 are both fixedly disposed on the same side of the base plate 11, and the inner convex ring 13 is located inside the outer convex ring 12, forming a receiving groove 14 between the outer convex ring 12 and the inner convex ring 13. The height of the inner convex ring 13 is lower than the height of the outer convex ring 12.

[0036] The outer wall of the convex ring 12 is provided with an external thread 15, and the inner wall is a tapered surface 16 whose diameter gradually decreases from the upper end to the lower end.

[0037] The base plate 11 is provided with an assembly hole 18, which is located at the bottom of the inner convex ring 13. The base plate 11 is also provided with a screw hole 17.

[0038] The elastic element 4 is located inside the outer convex ring 12 and within the receiving groove 14. In this embodiment, the elastic element 4 is a wave spring. In some other embodiments, the elastic element may also be a butterfly spring or other elastic structural element (such as an arc-shaped spring sheet).

[0039] The elastic clip 3 includes a fixing ring 31 and a plurality of spring pieces 21. The upper end of the spring piece 21 is connected to the fixing ring 31, and the lower end is located inside the outer convex ring 12 and abuts against the elastic element 4, and the outer wall of the spring piece 21 abuts against the inner wall of the outer convex ring 12. In this embodiment, a plurality of equally spaced spring pieces 32 are connected to the fixing ring 31, and the lower ends of the spring pieces 32 all extend towards the center to form a conical structure.

[0040] The locking nut 2 has a lens hole at its center and an internal thread on its inner side. The locking nut 2 is screwed to the external thread 15 on the outer wall of the outer convex ring 12 through the internal thread. The top of the inner side of the locking nut 2 also has an abutment part 21 that protrudes towards the center. The fixing ring 31 of the elastic clip 3 is located inside the locking nut 2, below the abutment part. The upper end of the fixing ring 31 abuts against the abutment part 21, so that the elastic clip 3 is clamped between the abutment part 21 and the elastic member 4.

[0041] like Figure 4 As shown, there is a certain gap between the lower end of the retaining ring 31 and the upper end of the outer convex ring 12, so that the retaining ring 31 has a certain downward movement space when the locking nut 2 is tightened.

[0042] The rear end of the thermal imaging lens 5 is installed onto the lens fixing device through the lens hole in the center of the locking nut 2, so that the rear end of the thermal imaging lens 5 is fitted into the elastic clip 3, and the spring piece 31 of the elastic clip 3 abuts against the outer side of the thermal imaging lens 5.

[0043] During installation, tightening the locking nut 2 causes the elastic clip 3 to press down on the elastic element 4. Simultaneously, the spring piece 32 of the elastic clip 3 moves towards the center under the action of the conical surface 16 of the outer convex ring 12, allowing the thermal imaging lens 5 to automatically center and hold the thermal imaging lens 5, thus achieving self-centering and fixation of the thermal imaging lens 5. During disassembly, loosening the locking nut 2 causes the thermal imaging lens 5 to be subjected to an upward elastic force under the elastic force of the elastic element 4, thereby loosening the thermal imaging lens 5.

[0044] In this embodiment, the lens unit achieves self-centering and clamping fixation of the thermal imaging lens 5 by changing the structural design. In addition, the internal and external threads that cooperate in locking are conventional threads, which have low machining accuracy requirements, reducing the difficulty of production and processing and the defect rate. At the same time, the fine debris generated by the thread engagement will not fall into the detector and affect the image.

[0045] Example 2

[0046] like Figure 5 The thermal imaging camera shown includes a detector 6 and a lens unit of embodiment 1. The lens unit is fixed to the detector 6 with screws through screw holes 17 on the base plate 11. The circuitry of the detector 6 can be electrically connected to the lens unit through assembly holes 18 on the base plate 11.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A lens fixing device, characterized in that, Includes lens mount, locking nut, spring clip, and elastic element; The lens mount is provided with a raised outer ring, the outer wall of which is provided with an external thread, and the inner wall is a tapered surface with a gradually decreasing diameter; The locking nut is provided with a lens hole and an internal thread on its inner side that is screwed into the external thread on the outer wall of the outer convex ring; The elastic clip is located between the lens mount and the locking nut, and includes a fixing ring and multiple spring pieces connecting the fixing ring; the fixing ring abuts against the locking nut; the side wall of the spring piece abuts against the inner wall of the outer convex ring; The elastic element is located on the inner side of the outer convex ring, and the lower end of the spring sheet abuts against the elastic element.

2. The lens fixing device according to claim 1, characterized in that, The lens mount is also provided with an inner convex ring, which is located inside the outer convex ring; there is a receiving groove between the outer convex ring and the inner convex ring, and the elastic element is located in the receiving groove.

3. The lens fixing device according to claim 1 or 2, characterized in that, The elastic element is a wave spring or a butterfly spring.

4. The lens fixing device according to claim 2, characterized in that, The lens mount includes a base plate, and the outer convex ring and the inner convex ring are disposed on the base plate.

5. The lens fixing device according to claim 4, characterized in that, The base plate is provided with an assembly hole, which is located at the bottom of the inner convex ring.

6. The lens fixing device according to claim 1, characterized in that, The fixed ring is connected to a plurality of equally spaced spring pieces.

7. The lens fixing device according to claim 1, characterized in that, The inner side of the locking nut has a protruding abutment, and the retaining ring abuts against the abutment.

8. The lens fixing device according to claim 7, characterized in that, The abutting part is located at the top of the inner side of the locking nut.

9. A lens unit, characterized in that, It includes a thermal imaging lens and a lens fixing device as described in any one of claims 1-8; the thermal imaging lens is sleeved in an elastic clip, and the spring abuts against the thermal imaging lens.

10. A thermal imaging camera, characterized in that, It includes a detector and the lens unit as described in claim 9, wherein the lens unit is disposed on the detector.

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