Infrared manual adjustable athermalization prime lens and use method thereof

Abstract

The invention discloses an infrared manual adjustable athermalization prime lens and a using method thereof.The infrared manual adjustable athermalization prime lens comprises a lens main body, a lens barrel is arranged in the lens main body, a gap is reserved between the lens main body and the lens barrel, a C-shaped ring used for limiting is arranged in the gap, a focusing hand wheel is arranged on the outer side of the lens main body, and the focusing hand wheel is arranged on the outer side of the lens main body. And the focusing hand wheel rotates to drive the lens barrel to move relative to the lens main body, so that the adjustment of the rear intercept is realized. According to the structure, the mode that the focusing hand wheel rotates in a threaded mode to drive the lens cone to move transversely is adopted, the structure is more reliable, the rotating hand feeling is smooth, the waterproof grade is high, the internal focusing mode is adopted, the relative movement of the lens cone is only in the lens, the overall appearance size of the lens is not changed, the requirement for the size of a client shell is low, and the appearance feeling is better. The hand wheel is limited by the clamp spring and the C-shaped ring, so that the device is small in size and suitable for a miniaturized uncooled infrared optical system; and the device is compact in structure, low in manufacturing cost and suitable for large-scale production.

Description

Technical Field

[0001] The invention relates to an infrared manually adjustable athermal fixed-focus lens and a use method thereof. Background Art

[0002] Infrared thermal imaging technology uses the principle of infrared radiation to measure the infrared radiation energy on the surface of the target object and convert the temperature distribution of the surface of the measured object into an intuitive thermal image (grayscale or color image). Since the infrared radiation energy on the surface of the object is measured, there is no need to contact the object and it will not interfere with the temperature field of the object. Therefore, infrared thermal imaging technology is very suitable for measuring moving objects, dangerous objects (such as high-voltage cables, boilers, etc.) and objects that are difficult to approach.

[0003] The characteristics of infrared lenses determine that they will work under various extreme temperatures, and there are certain thermal effects on infrared lenses and mechanical parts, which will cause focal length changes, image plane drift, etc., seriously affecting the imaging quality.

[0004] To ensure that the infrared lens has good imaging quality, it is required that the infrared lens has the ability to adjust the back focus distance to achieve the effect of imaging compensation. Optical and mechanical hybrid passive athermalization utilizes the differences between the thermal properties of optical and mechanical materials, and eliminates the influence of temperature through the combination of materials with different properties, so as to maintain image quality stability within a large range and achieve temperature-adaptive athermalization; and the lens structure needs to have the ability to manually focus. Rotating the focus hand wheel can adjust the back focus distance of the lens, so that the lens can be fine-tuned under various extreme conditions to achieve the best imaging quality.

[0005] Common infrared manual-adjustable lenses use a pin-driven lens barrel movement structure, which has a complex structure and the reliability of the internal structure cannot be guaranteed, resulting in a poor experience during actual use. The pin-limited structure naturally has the risk of pin breakage, and it is difficult to ensure its reliability during long-term use, which seriously affects its service life. At the same time, in order to compensate for the image drift caused by the thermal effect of the lens, the focusing process of the manual-adjustable lens needs to be delicate and subtle, but the pin structure has a short focusing stroke and fast speed, making it difficult to focus to find the best image surface. In addition, customers require manual-adjustable lenses to have waterproof and focusing feel, and the pin structure has too many unreliable factors during the assembly process, making it difficult to meet customer needs. Summary of the invention

[0006] In order to overcome the deficiencies of the prior art, the present invention provides an infrared manually adjustable athermal fixed-focus lens and a method for using the same. The infrared lens adopts an athermal design, utilizes the differences between the thermal properties of optical materials, and eliminates the effects of ambient temperature changes through the combination of materials with different properties, so as to maintain stable image quality within a large temperature range. The structure is simple, small in size, light in weight, does not require power supply, and has high reliability. The structure adopts a method in which the focusing hand wheel thread is rotated to drive the lens barrel to move horizontally. The structure is more reliable, the rotation feels smooth, and the waterproof level is high. The internal focusing method is adopted, that is, the relative movement of the lens barrel is only inside the lens, and the overall appearance size of the lens does not change. This has low requirements on the size of the customer shell and a better appearance. The hand wheel is limited by a retaining spring and a C-ring, which is small in size and suitable for use in miniaturized non-cooled infrared optical systems. The structure is compact, the production cost is low, and it is suitable for large-scale production.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: an infrared manually adjustable athermal fixed-focus lens, comprising a lens body, a lens barrel is arranged in the lens body, a gap is reserved between the lens body and the lens barrel, a C-shaped ring for limiting is arranged in the gap, a focusing hand wheel is arranged on the outside of the lens body, and the lens barrel is driven to move relative to the lens body by rotating the focusing hand wheel to achieve adjustment of the back focus.

[0008] As a preferred technical solution of the present invention, a negative focal lens, a spacer ring and a positive focal lens are sequentially arranged in the lens barrel, and a pressing ring for pressing is arranged on the side of the positive focal lens away from the spacer ring.

[0009] As a preferred technical solution of the present invention, two first sealing rings are preset between the lens body and the lens barrel, and the C-ring is located between the two first sealing rings.

[0010] As a preferred technical solution of the present invention, two second sealing rings are arranged between the lens body and the focusing hand wheel, and the two second sealing rings are located on both sides of the C-shaped ring.

[0011] As a preferred technical solution of the present invention, matching threads are provided at the connection between the focusing hand wheel, the lens barrel and the lens body.

[0012] As a preferred technical solution of the present invention, lubricating oil is applied to the threaded connections between the focusing hand wheel, the lens barrel and the lens body.

[0013] As a preferred technical solution of the present invention, a retaining spring for limiting position is provided at the rear end of the focusing hand wheel.

[0014] A method for using an infrared manually adjustable athermal fixed-focus lens, the specific steps are as follows: S1. Place the negative focal lens, spacer, and positive focal lens into the lens barrel in sequence and press them tightly with a pressing ring; S2. Install the two first sealing rings on the assembled lens barrel in sequence and apply lubricating oil; S3, install the lens barrel in the lens body, insert a C-ring in the gap between the lens body and the lens barrel, and then put two second sealing rings on the lens body in sequence, and apply lubricating oil on the second sealing rings; S4. Apply lubricating oil to the threads of the lens barrel and the focusing hand wheel, connect the focusing hand wheel to the lens barrel and the lens body through the threads, and install a retaining spring at the rear end of the focusing hand wheel to serve as a limit. S5. Use the above parts to assemble the lens into a whole. Hold the focusing hand wheel and rotate it to drive the lens barrel to move relative to the lens body to adjust the back focus distance.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the infrared lens adopts a heatless design, utilizes the difference between the thermal properties of optical materials, and eliminates the influence of ambient temperature changes through the combination of materials with different properties, so as to maintain the stability of image quality within a large temperature range, and has a simple structure, small size, light weight, no need for power supply and high reliability. The structure adopts the method of rotating the focusing hand wheel thread to drive the lens barrel to move horizontally, which is more reliable, has a smooth rotation feel, and a high waterproof level. In addition, the internal focusing method is adopted, that is, the relative movement of the lens barrel is only inside the lens, and the overall appearance size of the lens does not change, which has low requirements on the size of the customer shell and better appearance. The hand wheel is limited by a retaining spring and a C-ring, which is small in size and suitable for use in miniaturized non-cooled infrared optical systems; and the structure is compact, the production cost is low, and it is suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention from a first viewing angle; Figure 2 It is a schematic diagram of the overall structure of the present invention from a second viewing angle; Figure 3 A cross-sectional view of the present invention as a whole; Figure 4 It is a structural schematic diagram of the lens body of the present invention; Figure 5 It is a schematic diagram of the structure of the C-type ring of the present invention; Figure 6 It is a schematic structural diagram of the second sealing ring of the present invention.

[0017] Among them: 1. Negative focal lens; 2. Spacer; 3. Positive focal lens; 4. Pressure ring; 5. Lens barrel; 6. Lens body; 7. Focusing hand wheel; 8. Circlip; 9. First sealing ring 9; 10. Second sealing ring; 11. C-ring. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention. The experimental methods in the following embodiments, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can be obtained from commercial channels.

[0019] Example: like Figure 1 - Figure 6 As shown, this embodiment proposes an infrared manually adjustable athermal fixed-focus lens, comprising a lens body 6, a lens barrel 5 is arranged in the lens body 6, a gap is reserved between the lens body 6 and the lens barrel 5, a C-shaped ring 11 for limiting is arranged in the gap, a focusing hand wheel 7 is arranged on the outside of the lens body 6, and the lens barrel 5 is driven to move relative to the lens body 6 by rotating the focusing hand wheel 7 to adjust the back focus; The infrared lens adopts chalcogenide infrared glass, which has good chemical stability and high infrared transmittance; and adopts molding technology to form infrared optical elements that meet the requirements in one time, with high production efficiency and low processing cost. The infrared lens adopts a non-thermal design, utilizing the differences between the thermal properties of optical materials and combining materials with different properties to eliminate the influence of ambient temperature changes, maintaining stable image quality within a large temperature range, and has a simple structure, small size, light weight, no need for power supply and high reliability. This structure adopts the method of rotating the focusing hand wheel 7 to drive the lens barrel 5 to move horizontally, which has a more reliable structure, smooth rotation feel, high waterproof level, and adopts an internal focusing method, that is, the relative movement of the lens barrel 5 is only inside the lens, and the overall appearance size of the lens does not change, which has low requirements on the size of the customer shell and better appearance. The hand wheel is limited by a retaining spring 8 and a C-ring 11, which is small in size and suitable for use in miniaturized non-cooled infrared optical systems; and the structure is compact, the production cost is low, and it is suitable for large-scale production.

[0020] Among them, the lens barrel 5 is provided with a negative focal lens 1, a spacer 2 and a positive focal lens 3 in sequence, and the positive focal lens 3 is provided with a pressing ring 4 for pressing away from the spacer 2. Two first sealing rings 9 are preset between the lens body 6 and the lens barrel 5, and the C-shaped ring 11 is located between the two first sealing rings 9. Two second sealing rings 10 are provided between the lens body 6 and the focusing hand wheel 7, and the two second sealing rings 10 are located on both sides of the C-shaped ring 11 at the same time. The C-shaped ring is used to limit the position, and the lens structure with the smallest limit is obtained. The connection between the focusing hand wheel 7, the lens barrel 5 and the lens body 6 is provided with matching threads, and the lens barrel 5 is driven to move horizontally by the rotation of the focusing hand wheel 7 thread. The structure is more reliable, the rotation feel is smooth, and the waterproof level is high. In addition, the internal focusing method is adopted, that is, the relative movement of the lens barrel 5 is only inside the lens, and the overall appearance size of the lens does not change, which has low requirements on the size of the client shell and better appearance. The design method of manual focusing of infrared lens adopts the internal adjustment method and thread transmission. The threaded connections of the focusing hand wheel 7, the lens barrel 5 and the lens body 6 are smeared with lubricating oil, and a retaining spring 8 for limiting is provided at the rear end of the focusing hand wheel 7. The multi-layer sealing ring design of this structure has good sealing performance, improves the vibration and impact resistance of the lens, and ensures the use requirements and sealing performance of the system.

[0021] A method for using an infrared manually adjustable athermal fixed-focus lens, the specific steps are as follows: S1, sequentially place the negative focal lens 1, the spacer 2, and the positive focal lens 3 into the lens barrel 5, and press them tightly with the pressing ring 4; S2, respectively install the two first sealing rings 9 on the assembled lens barrel 5, and apply lubricating oil; S3, install the lens barrel 5 in the lens body 6, insert the C-shaped ring 11 in the gap between the lens body 6 and the lens barrel 5, and then put two second sealing rings 10 on the lens body 6 in sequence, and apply lubricating oil on the second sealing rings 10; S4, apply lubricating oil to the threads of the lens barrel 5 and the focusing hand wheel 7, connect the focusing hand wheel 7 with the lens barrel 5 and the lens body 6 through the threads, and install a retaining spring 8 at the rear end of the focusing hand wheel 7 for limiting the position; S5. Use the above parts to assemble the lens into a whole, hold the focusing hand wheel 7 and rotate it to drive the lens barrel 5 to move relative to the lens body 6 to adjust the back focus distance.

[0022] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above implementation regulations. The above implementation regulations and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An infrared manually adjustable athermal fixed-focus lens, characterized in that: The lens body (6) comprises a lens barrel (5) disposed inside the lens body (6), a gap being reserved between the lens body (6) and the lens barrel (5), a C-shaped ring (11) being disposed in the gap for limiting, and a focusing hand wheel (7) being disposed outside the lens body (6), wherein the focusing hand wheel (7) is rotated to drive the lens barrel (5) to move relative to the lens body (6), thereby achieving adjustment of the back focus distance.

2. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: The lens barrel (5) is provided with a negative focal lens (1), a spacer ring (2) and a positive focal lens (3) in sequence, and a pressing ring (4) for pressing is provided on the side of the positive focal lens (3) away from the spacer ring (2).

3. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: Two first sealing rings (9) are preset between the lens body (6) and the lens barrel (5), and the C-shaped ring (11) is located between the two first sealing rings (9).

4. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: Two second sealing rings (10) are arranged between the lens body (6) and the focus hand wheel (7), and the two second sealing rings (10) are located on both sides of the C-shaped ring (11) at the same time.

5. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: Matching threads are provided at the connection points between the focusing hand wheel (7), the lens barrel (5) and the lens body (6).

6. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: The threaded connections between the focusing hand wheel (7), the lens barrel (5) and the lens body (6) are smeared with lubricating oil.

7. The infrared manually adjustable athermal fixed-focus lens according to claim 1, characterized in that: A retaining spring (8) for limiting position is arranged at the rear end of the focusing hand wheel (7).

8. The method for using the infrared manually adjustable athermal fixed-focus lens according to any one of claims 1 to 7, characterized in that: S1. Place the negative focal lens (1), the spacer (2), and the positive focal lens (3) into the lens barrel (5) in sequence, and press them tightly with the pressing ring (4); S2, respectively installing the two first sealing rings (9) on the assembled lens barrel (5) and applying lubricating oil; S3, installing the lens barrel (5) in the lens body (6), inserting a C-shaped ring (11) into the gap between the lens body (6) and the lens barrel (5), and then sequentially placing two second sealing rings (10) on the lens body (6), and applying lubricating oil to the second sealing rings (10); S4, applying lubricating oil to the threads of the lens barrel (5) and the focusing hand wheel (7), connecting the focusing hand wheel (7) with the lens barrel (5) and the lens body (6) through the threads, and installing a retaining spring (8) at the rear end of the focusing hand wheel (7) for limiting the position; S5. The lens is assembled into a whole using the above parts. The focusing hand wheel (7) is rotated by hand to drive the lens barrel (5) to move relative to the lens body (6) first, thereby adjusting the back focus distance.

Images