Medium wave refrigeration type infrared lens convenient for virtual focus

Abstract

The utility model belongs to the technical field of infrared imaging, and discloses a medium wave refrigeration type infrared lens convenient for virtual focus, which comprises a first pressing ring, and the outer surface of the first pressing ring is movably sleeved with a main lens barrel. According to the utility model, the first zoom lens frame, the third lens, the second lens and the second zoom lens frame are arranged, and the zoom cam is rotated, so that the first guide rod can drive the first zoom lens frame and the second zoom lens frame to do reciprocating rectilinear motion in the main lens barrel, and therefore, the first zoom lens frame drives the second lens to do rectilinear motion; the second zoom lens frame can drive the third lens to do linear motion, when a first guide rod in the second zoom lens frame rotates into a third cam groove, the third lens can be kept stable, the second lens continues to do linear motion, and when the position of the second lens rotates to enable an observed picture to be extremely fuzzy, the third lens can be kept stable. And when the deviation from the design value is large, the virtual focus function is realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of infrared imaging, in particular to a medium-wave refrigeration type infrared lens which is convenient for defocusing. Background Art

[0002] Medium-wave cooled infrared lenses are an important part of the field of infrared imaging technology and play a key role in many applications. In the early research of infrared technology, the characteristics of the medium-wave infrared band have gradually been recognized. Medium-wave infrared has a moderate wavelength range and can penetrate environmental interference such as smoke and dust to a certain extent. At the same time, it has a good response to the thermal radiation of the target.

[0003] In order to achieve effective medium-wave infrared imaging, cooling technology becomes the key. Through cooling, the noise of the detector can be reduced and its sensitivity and resolution can be improved. In the development of medium-wave cooled infrared lenses, the selection and research of optical materials have been continuously deepened. Commonly used optical materials such as zinc selenide and zinc sulfide have good transmittance and optical performance in the medium-wave infrared band. In terms of optical design, in order to achieve high-quality imaging, complex optical systems are designed. For example, a combination of multiple lenses is used to correct aberrations and improve image clarity and contrast. At the same time, the application of aspheric and diffractive optical elements is gradually increasing, further optimizing the performance of the lens. Advances in manufacturing technology have provided a guarantee for the production of medium-wave cooled infrared lenses. High-precision processing equipment can produce optical elements with micron-level precision, while advanced coating technology can improve the surface quality and transmittance of the lens. At present, the defocus function of medium-wave cooled infrared lenses is realized on the focusing cam, but the defocus correction effect is not very good. Therefore, in order to meet the defocus requirements, it needs to be improved. Utility Model Content

[0004] The purpose of the present invention is to solve the above problems. The present invention provides a medium-wave refrigeration infrared lens that is convenient for defocusing and has the advantage of better defocus correction.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a medium-wave cooling type infrared lens that is convenient for defocusing, comprising a No. 1 pressure ring, the outer surface of the No. 1 pressure ring is movably sleeved with a main lens barrel, the outer surface of the main lens barrel is movably sleeved with a front lens frame, the left side of the interior of the main lens barrel is movably sleeved with a No. 1 lens, the outer surface of the No. 1 lens is movably connected to the outer surface of the No. 1 pressure ring, the interior of the main lens barrel is movably sleeved with a second zoom lens frame, the interior of the second zoom lens frame is movably sleeved with a No. 3 lens, the interior of the main lens barrel is movably sleeved with a first zoom lens frame, the left side of the interior of the first zoom lens frame is movably sleeved with a No. 2 lens, and the outer surface of the main lens barrel is movably sleeved A zoom cam is sleeved on the right side of the main lens barrel, a rear lens barrel is fixedly installed on the right side of the main lens barrel, a focusing cam is movably sleeved on the outer surface of the rear lens barrel, motor seats are fixedly installed on the top of the main lens barrel and the rear lens barrel, a power motor is fixedly installed on the outer surface of the motor seat, the other end of the power motor output shaft is fixedly connected to a rotating shaft, a gear is fixedly sleeved on the outer surface of the rotating shaft, there are two gears, the outer surfaces of the two gears are respectively meshed with the outer surfaces of the zoom cam and the focusing cam, a focusing frame is movably sleeved on the right side of the interior of the rear lens barrel, a No. 5 lens is movably sleeved on the interior of the focusing frame, and a No. 4 lens is movably sleeved on the left side of the interior of the rear lens barrel.

[0006] As a preferred embodiment of the present invention, a first guide rod is movably installed inside the zoom cam, and the bottom end of the first guide rod passes through the main lens barrel and extends to the interior of the first magnification frame and the second magnification frame and is movably connected to the inner walls of the main lens barrel, the first magnification frame and the second magnification frame respectively; a second guide rod is movably installed inside the focusing cam, and the bottom end of the second guide rod passes through the rear lens barrel and extends to the interior of the focusing frame and is movably connected to the inner walls of the rear lens barrel and the focusing frame respectively; the interior of the first magnification frame is movably sleeved with a No. 2 pressure ring located on the left side of the No. 2 lens, and the outer surface of the No. 2 pressure ring is movably connected to the outer surface of the No. 2 lens.

[0007] As a preferred embodiment of the present invention, the top and bottom of the zoom cam are provided with a first cam groove and a second cam groove, the front and back of the zoom cam are provided with a third cam groove and a fourth cam groove, the inner surfaces of the third cam groove, the fourth cam groove, the first cam groove and the second cam groove are movably connected to the outer surface of the first guide rod, the interior of the second zoom lens frame is movably sleeved with a No. 3 pressure ring, and the outer surface of the No. 3 pressure ring is movably connected to the outer surface of the No. 3 lens.

[0008] As a preferred embodiment of the present invention, a No. 1 washer is movably sleeved on the right side of the outer surface of the main lens barrel, and a No. 6 pressure ring is movably sleeved on the outer surface of the main lens barrel and is located on the right side of the No. 1 washer.

[0009] As a preferred embodiment of the present invention, a No. 2 washer is movably sleeved on the right side of the outer surface of the rear lens barrel, and a No. 7 pressure ring located on the right side of the No. 2 washer is movably sleeved on the outer surface of the rear lens barrel.

[0010] As a preferred embodiment of the present invention, a No. 5 pressure ring is movably sleeved inside the focusing frame, and an outer surface of the No. 5 pressure ring is movably connected to an outer surface of the No. 5 lens.

[0011] As a preferred embodiment of the present invention, a No. 4 pressure ring is movably sleeved inside the rear lens barrel, and an outer surface of the No. 4 pressure ring is movably connected to the outer surface of the No. 4 lens.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] The utility model is provided with a first zoom frame, a third lens, a second lens and a second zoom frame, and by rotating the zoom cam, the first guide rod can drive the first zoom frame and the second zoom frame to perform reciprocating linear motion inside the main lens barrel, so that the first zoom frame drives the second lens to perform linear motion, and the second zoom frame will drive the third lens to perform linear motion. When the first guide rod inside the second zoom frame rotates to the inside of the third cam groove, the third lens will remain stable, and the second lens will continue to perform linear motion. When the position of the second lens is rotated to the point where the observed image is extremely blurred and deviates greatly from the design value, the defocus function is realized, so that the No. 1 pressure ring as a whole can be more quickly and accurately rotated to an angle with a large deviation from the design value when performing defocus correction, thereby accurately correcting and achieving a clear imaging effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the utility model;

[0015] Figure 2 It is a structural schematic diagram of the side surface of the utility model;

[0016] Figure 3 This is a schematic diagram of the cross-sectional structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the imaging optical path of the utility model;

[0018] Figure 5 This is a schematic diagram of the defocused light path of the utility model;

[0019] Figure 6 This is the imaging effect diagram after defocusing of the utility model;

[0020] Figure 7 Schematic diagram of the third cam groove and the fourth cam groove curve of the zoom cam of the present invention;

[0021] Figure 8 This is a schematic diagram of the first cam groove and the second cam groove curves of the zoom cam of the present invention;

[0022] Figure 9 This is a schematic diagram of the zoom cam structure of the utility model.

[0023] In the figure: 1. Pressure ring No. 1; 2. Front lens frame; 3. Main lens barrel; 4. Pressure ring No. 2; 5. Zoom cam; 6. Pressure ring No. 3; 7. Power motor; 8. Motor seat; 9. Washer No. 1; 10. Pressure ring No. 6; 11. Rotating shaft; 12. Focusing cam; 13. Washer No. 2; 14. Pressure ring No. 7; 15. Lens No. 5; 16. Focusing frame; 17. Pressure ring No. 5; 18. Lens No. 4; 19. Rear lens barrel; 20. Pressure ring No. 4; 21. First zoom lens frame; 22. Lens No. 3; 23. Lens No. 2; 24. Second zoom lens frame; 25. Lens No. 1; 26. Gear; 27. First guide rod; 28. Second guide rod; 29. Third cam groove; 30. Fourth cam groove; 31. First cam groove; 32. Second cam groove. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] like Figures 1 to 9As shown, the utility model provides a medium-wave cooling infrared lens that is convenient for defocusing, including a No. 1 pressing ring 1, the outer surface of the No. 1 pressing ring 1 is movably sleeved with a main lens barrel 3, the outer surface of the main lens barrel 3 is movably sleeved with a front lens frame 2, the left side of the interior of the main lens barrel 3 is movably sleeved with a No. 1 lens 25, the outer surface of the No. 1 lens 25 is movably connected to the outer surface of the No. 1 pressing ring 1, the interior of the main lens barrel 3 is movably sleeved with a second magnification lens frame 24, the interior of the second magnification lens frame 24 is movably sleeved with a No. 3 lens 22, the interior of the main lens barrel 3 is movably sleeved with a first magnification lens frame 21, the left side of the interior of the first magnification lens frame 21 is movably sleeved with a No. 2 lens 23, the outer surface of the main lens barrel 3 is movably sleeved with a zoom cam 5, and the main lens The right side of the barrel 3 is fixedly installed with a rear lens barrel 19, and the outer surface of the rear lens barrel 19 is movably sleeved with a focusing cam 12. The tops of the main lens barrel 3 and the rear lens barrel 19 are fixedly installed with a motor base 8. The outer surface of the motor base 8 is fixedly installed with a power motor 7. The other end of the output shaft of the power motor 7 is fixedly connected to a rotating shaft 11. The outer surface of the rotating shaft 11 is fixedly sleeved with a gear 26. There are two gears 26. The outer surfaces of the two gears 26 are respectively meshed with the outer surfaces of the zoom cam 5 and the focusing cam 12. The right side of the interior of the rear lens barrel 19 is movably sleeved with a focusing frame 16, and the interior of the focusing frame 16 is movably sleeved with the number five lens 15. The left side of the interior of the rear lens barrel 19 is movably sleeved with the number four lens 18.

[0026] By rotating the zoom cam 5, the first zoom lens frame 21 and the second zoom lens frame 24 can move linearly inside the main lens barrel 3, thereby adjusting the positions of the third lens 22 and the second lens 23. The optical system parameter table is as follows:

[0027]

[0028] Among them, the zoom cam 5 is internally movably installed with a first guide rod 27, the bottom end of the first guide rod 27 passes through the main lens barrel 3 and extends to the interior of the first magnification frame 21 and the second magnification frame 24 and is movably connected to the inner walls of the main lens barrel 3, the first magnification frame 21 and the second magnification frame 24 respectively; the focusing cam 12 is internally movably installed with a second guide rod 28, the bottom end of the second guide rod 28 passes through the rear lens barrel 19 and extends to the interior of the focusing frame 16 and is movably connected to the inner walls of the rear lens barrel 19 and the focusing frame 16 respectively; the first magnification frame 21 is internally movably sleeved with a No. 2 pressure ring 4 located on the left side of the No. 2 lens 23, and the outer surface of the No. 2 pressure ring 4 is movably connected to the outer surface of the No. 2 lens 23.

[0029] As a technical optimization solution of the present invention, the zoom cam 5 is connected to the first magnification frame 21, the second magnification frame 24 and the main lens barrel 3 through the first guide rod 27. The rotation of the zoom cam 5 will drive the first guide rod 27 to rotate, thereby driving the focusing frame 16 to perform reciprocating linear motion inside the main lens barrel 3 through the first guide rod 27. The focusing cam 12 is connected to the focusing frame 16 through the second guide rod 28. The rotation of the focusing cam 12 will drive the second guide rod 28 to rotate, so that the second guide rod 28 can drive the focusing frame 16 to perform reciprocating linear motion inside the rear lens barrel 19.

[0030] Among them, the top and bottom of the zoom cam 5 are both provided with a first cam groove 31 and a second cam groove 32, and the front and back of the zoom cam 5 are both provided with a third cam groove 29 and a fourth cam groove 30. The inner surfaces of the third cam groove 29, the fourth cam groove 30, the first cam groove 31 and the second cam groove 32 are all movably connected to the outer surface of the first guide rod 27, and the interior of the second magnification lens frame 24 is movably sleeved with a No. 3 pressure ring 6, and the outer surface of the No. 3 pressure ring 6 is movably connected to the outer surface of the No. 3 lens 22.

[0031] As a technical optimization solution of the present invention, by providing a No. 3 pressure ring 6 , the No. 3 lens 22 can be stably installed inside the second zoom lens frame 24 .

[0032] Among them, the right side of the outer surface of the main lens barrel 3 is movably sleeved with a No. 1 washer 9, and the outer surface of the main lens barrel 3 is movably sleeved with a No. 6 pressure ring 10 located on the right side of the No. 1 washer 9.

[0033] As a technical optimization solution of the present invention, the zoom cam 5 can be limited by providing a No. 1 washer 9 and a No. 6 pressure ring 10.

[0034] The right side of the outer surface of the rear lens barrel 19 is movably sleeved with a No. 2 washer 13 , and the outer surface of the rear lens barrel 19 is movably sleeved with a No. 7 pressure ring 14 located on the right side of the No. 2 washer 13 .

[0035] As a technical optimization solution of the present invention, by providing the No. 2 washer 13 and the No. 7 pressure ring 14 , the focusing cam 12 can be limited and locked.

[0036] The focusing frame 16 is internally movably sleeved with a No. 5 pressing ring 17 , and the outer surface of the No. 5 pressing ring 17 is movably connected to the outer surface of the No. 5 lens 15 .

[0037] As a technical optimization solution of the present invention, by providing a No. 5 pressure ring 17 , the No. 5 lens 15 can be installed inside the focusing frame 16 .

[0038] The rear lens barrel 19 is internally movably sleeved with a No. 4 pressing ring 20 , and the outer surface of the No. 4 pressing ring 20 is movably connected to the outer surface of the No. 4 lens 18 .

[0039] As a technical optimization solution of the present invention, due to the design of the No. 4 pressure ring 20, the No. 4 lens 18 can be stably installed inside the rear lens barrel 19.

[0040] The working principle and use process of this utility model:

[0041] By rotating the focusing cam 12, the second guide rod 28 drives the focusing frame 16 to perform linear motion. At this time, the number five lens 15 inside the focusing frame 16 will be driven by the focusing frame 16 to perform linear motion, thereby adjusting the distance between the number five lens 15 and the number four lens 18, and realizing the focusing function. By rotating the zoom cam 5, the first guide rod 27 drives the first magnification change frame 21 and the second magnification change frame 24 to perform linear motion, thereby causing the number two lens 23 and the number three lens 22 to change their relative positions by linear motion, and realizing the zoom function at the same time. By changing the length of the first cam groove 31 and the second cam groove 32, the A ends of the first cam groove 31 and the second cam groove 32 are moved along the axis parallel to the edge of the main lens barrel 3. The extended part is extended by three millimeters in the right direction, and the extended part forms an angle of 25 degrees with the edge of the main lens barrel 3, thereby rotating the zoom cam 5, so that the first guide rod 27 drives the first magnification change frame 21 and the second magnification change frame 24 to move in a straight line, and then the No. 2 lens 23 moves in a straight line along the inner surface of the first cam groove 31 and the second cam groove 32, and the No. 3 lens 22 moves in a straight line along the inner surface of the third cam groove 29 and the fourth cam groove 30. When it is rotated to the left side inside the third cam groove 29 and the fourth cam groove 30, the No. 3 lens 22 will remain stable. At this time, the No. 2 lens 23 will continue to move in a slow straight line. When the position of the No. 2 lens 23 is rotated to the point where the observed image is extremely blurred and deviates greatly from the design value, the defocus function is realized.

[0042] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0043] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium-wave refrigeration type infrared lens that facilitates defocusing, comprising a first pressure ring (1), characterized in that: The outer surface of the No. 1 pressing ring (1) is movably sleeved with the main lens barrel (3), the outer surface of the main lens barrel (3) is movably sleeved with the front lens frame (2), the left side of the interior of the main lens barrel (3) is movably sleeved with the No. 1 lens (25), the outer surface of the No. 1 lens (25) is movably connected to the outer surface of the No. 1 pressing ring (1), the interior of the main lens barrel (3) is movably sleeved with the second magnification lens frame (24), the interior of the second magnification lens frame (24) is movably sleeved with the No. 3 lens (22), the interior of the main lens barrel (3) is movably sleeved with the first magnification lens frame (21), the left side of the interior of the first magnification lens frame (21) is movably sleeved with the No. 2 lens (23), the outer surface of the main lens barrel (3) is movably sleeved with the zoom cam (5), the right side of the main lens barrel (3) is fixedly mounted with the rear lens barrel (19), the rear lens barrel (21 ... front lens frame (25), the left side of the interior of the main lens barrel ( The outer surface of the lens barrel (19) is movably sleeved with a focusing cam (12); the tops of the main lens barrel (3) and the rear lens barrel (19) are fixedly mounted with a motor base (8); the outer surface of the motor base (8) is fixedly mounted with a power motor (7); the other end of the output shaft of the power motor (7) is fixedly connected with a rotating shaft (11); the outer surface of the rotating shaft (11) is fixedly sleeved with a gear (26); there are two gears (26); the outer surfaces of the two gears (26) are respectively meshed with the outer surfaces of the zoom cam (5) and the focusing cam (12); the right side of the interior of the rear lens barrel (19) is movably sleeved with a focusing frame (16); the interior of the focusing frame (16) is movably sleeved with a No. 5 lens (15); and the left side of the interior of the rear lens barrel (19) is movably sleeved with a No. 4 lens (18).

2. The medium-wavelength cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: A first guide rod (27) is movably mounted inside the zoom cam (5), the bottom end of which passes through the main lens barrel (3) and extends to the interior of the first zoom lens frame (21) and the second zoom lens frame (24) and is movably connected to the inner walls of the main lens barrel (3), the first zoom lens frame (21) and the second zoom lens frame (24), respectively. A second guide rod (28) is movably mounted inside the focus cam (12), the bottom end of which passes through the rear lens barrel (19) and extends to the interior of the focus lens frame (16) and is movably connected to the inner walls of the rear lens barrel (19) and the focus lens frame (16), respectively. A second pressure ring (4) located on the left side of the second lens (23) is movably sleeved inside the first zoom lens frame (21), and the outer surface of the second pressure ring (4) is movably connected to the outer surface of the second lens (23).

3. The medium-wavelength cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: The top and bottom of the zoom cam (5) are both provided with a first cam groove (31) and a second cam groove (32); the front and back of the zoom cam (5) are both provided with a third cam groove (29) and a fourth cam groove (30); the inner surfaces of the third cam groove (29), the fourth cam groove (30), the first cam groove (31) and the second cam groove (32) are all movably connected to the outer surface of the first guide rod (27); the interior of the second zoom lens frame (24) is movably sleeved with a third pressure ring (6); the outer surface of the third pressure ring (6) is movably connected to the outer surface of the third lens (22).

4. The medium-wavelength cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: The right side of the outer surface of the main lens barrel (3) is movably sleeved with a No. 1 washer (9), and the outer surface of the main lens barrel (3) is movably sleeved with a No. 6 pressure ring (10) located on the right side of the No. 1 washer (9).

5. The medium-wave cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: The right side of the outer surface of the rear lens barrel (19) is movably sleeved with a No. 2 washer (13), and the outer surface of the rear lens barrel (19) is movably sleeved with a No. 7 pressure ring (14) located on the right side of the No. 2 washer (13).

6. The medium-wavelength cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: A No. 5 pressing ring (17) is movably sleeved inside the focusing frame (16), and the outer surface of the No. 5 pressing ring (17) is movably connected to the outer surface of the No. 5 lens (15).

7. The medium-wavelength cooled infrared lens that facilitates defocusing according to claim 1, characterized in that: A No. 4 pressing ring (20) is movably sleeved inside the rear lens barrel (19), and the outer surface of the No. 4 pressing ring (20) is movably connected to the outer surface of the No. 4 lens (18).

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