A micro-light-level high-definition optical lens

Abstract

This invention provides a low-light high-definition optical lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, a filter, and a photosensitive chip arranged sequentially along the optical axis from the object plane to the image plane. The first to tenth lenses are all glass spherical lenses, and the focal lengths of the first to tenth lenses are positive, positive, negative, negative, positive, positive, positive, positive, positive, positive, negative, respectively. This invention achieves a lens F-number of 1.4 and eliminates blurring at high and low temperatures (high temperature +85℃, low temperature -40℃) by using only 10 glass lenses. Since the number of lens elements is reduced from 14 to 10, the space occupied by 4 lenses is reduced, greatly reducing the space occupied by the optical components.

Description

Technical Field

[0001] This invention relates to the field of optical lens technology, and specifically to a low-light high-definition optical lens. Background Technology

[0002] In recent years, with the continuous development of network technology and the advancement of smart city and intelligent transportation projects, higher demands have been placed on optical lenses in terms of resolution, high-magnification zoom, ability to distinguish objects in low light and strong light, wide field of view, fog penetration, and image stabilization. The demand is showing a trend towards high-end and intelligent features. The expansion of the optical lens market has not only brought tremendous momentum to the industry but has also driven the continuous improvement of optical lens demand, with new technological requirements constantly emerging. High resolution, infrared confocal focal length, wide angle, large aperture, corrosion resistance, and ability to withstand harsh environments have become primary requirements for security monitoring lenses.

[0003] In existing technologies, in order to meet the requirements of high-definition lenses in low light and ensure that the lens is not out of focus under high and low temperature conditions (high temperature +80℃, low temperature -40℃), the total number of glass lenses must reach more than 14. The product resolution is poor, the yield rate after assembly is low, and the effect is not ideal in the high-end field. Summary of the Invention

[0004] In view of this, the present invention provides a low-light high-definition optical lens that can achieve focus-free operation at high and low temperatures (high temperature +85℃, low temperature -40℃) using only 10 glass lenses.

[0005] To achieve the above objectives, the present invention provides a low-light high-definition optical lens, which adopts the following technical solution:

[0006] A low-light high-definition optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, a filter, and a photosensitive chip arranged sequentially along the optical axis from the object plane to the image plane. The first to tenth lenses are all glass spherical lenses, and the focal lengths of the first to tenth lenses are positive, positive, negative, negative, positive, positive, positive, positive, positive, positive, negative, respectively.

[0007] The lens of this invention uses a glass aspherical lens design, reducing the number of lens elements to 10. With only 10 glass lens elements, the lens can achieve an F-number of 1.4 and achieve no blurring at high and low temperatures (high temperature +85℃, low temperature -40℃). Since the number of lens elements has been reduced from 14 to 10, the space occupied by 4 lens elements is reduced, which greatly reduces the space occupied by optical components!

[0008] Furthermore, the first lens, the third lens, and the eighth lens are all made of high refractive index materials.

[0009] Through the above technical solutions, the use of high refractive index material lenses can effectively correct spherical aberration and coma, resulting in smaller residual spherical aberration and coma in the lens.

[0010] Furthermore, the second, fifth, and ninth lenses are all made of ultra-low dispersion materials.

[0011] Through the above technical solutions, the introduction of ultra-low dispersion material lenses effectively reduces the axial chromatic aberration of the optical system;

[0012] It can effectively correct aberrations such as spherical aberration, coma, astigmatism, and field curvature, thereby improving the resolution quality of the lens and achieving ideal resolution.

[0013] Furthermore, an aperture stop is provided between the fifth lens and the sixth lens to limit the light beam.

[0014] Through the above technical solution, the optical structure of the lenses near the aperture is arranged in an approximately symmetrical manner, which further reduces chromatic aberration and achieves infrared confocal effect with an infrared defocus of 0.006mm.

[0015] Furthermore, the center thicknesses of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are 4.8mm, 5.7mm, 1.00mm, 1.00mm, 7.80mm, 7.13mm, 13.00mm, 4.35mm, 5.99mm, and 1.00mm, respectively.

[0016] Furthermore, the distances between the first lens and the second lens, the third lens and the fourth lens, the sixth lens and the seventh lens, the seventh lens and the eighth lens, and the eighth lens and the ninth lens are 13.07 mm, 5.37 mm, 1.34 mm, 0.09 mm, and 0.11 mm, respectively.

[0017] Furthermore, the radii of curvature on the object side of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are 51.77 mm, 20.68 mm, 347.80 mm, -30.77 mm, 18.34 mm, 107.80 mm, -28.29 mm, 45.82 mm, 28.33 mm, and -49.39 mm, respectively.

[0018] Furthermore, the radii of curvature on the image plane side of the first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens, eighth lens, ninth lens, and tenth lens are 173.50 mm, 347.80 mm, 18.06 mm, 18.34 mm, -32.21 mm, -107.80 mm, -24.25 mm, -268.99 mm, -49.39 mm, and 17.82 mm, respectively.

[0019] Furthermore, the first, third, and seventh lenses are all negative meniscus lenses, the second lens is a positive meniscus lens, the fourth and tenth lenses are both biconcave lenses, and the fifth, sixth, eighth, and ninth lenses are all biconvex lenses.

[0020] Through the above technical solutions, the selection of glass materials and the improvement of lens shape, infrared confocal night vision function has been achieved.

[0021] Furthermore, the second and third lenses, the fourth and fifth lenses, and the ninth and tenth lenses are all combined to form a cemented lens for eliminating chromatic aberration.

[0022] The above technical solutions can achieve the effect of eliminating color difference.

[0023] The above-described technical solution of the present invention has at least the following beneficial effects:

[0024] 1. This invention achieves an F-number of 1.4 and eliminates blurring at both high and low temperatures (high temperature +85℃, low temperature -40℃) by using only 10 glass lenses.

[0025] 2. The second, fifth, and ninth lenses are all made of ultra-low dispersion materials, while the first, third, and eighth lenses are made of high refractive index materials. This ensures functionality while reducing the number of lenses used, thereby reducing the overall length of the lens and greatly reducing the space occupied by optical components. Through optical design modifications, the overall optical length of the lens is ultimately reduced to less than 100mm.

[0026] 3. The use of high refractive index material lenses can effectively correct spherical aberration and coma, resulting in smaller residual spherical aberration and coma in the lens; the introduction of ultra-low dispersion material lenses effectively reduces axial chromatic aberration in the optical system.

[0027] 4. The second, fifth, and ninth lenses are all made of ultra-low dispersion materials, which is beneficial for correcting chromatic aberration and secondary spectrum. Through the approximately symmetrical optical structure arrangement of the lenses near the aperture stop, chromatic aberration is further reduced, thereby achieving infrared confocal effect with an infrared defocus of 0.006mm.

[0028] 5. By using ultra-low dispersion materials in the second, fifth, and ninth lenses, and high refractive index materials in the first, third, and eighth lenses, aberrations such as spherical aberration, coma, astigmatism, and field curvature can be effectively corrected, thereby improving the resolving quality of the lens and achieving ideal resolving power.

[0029] 6. By selecting the lens glass material and improving the lens shape, infrared confocal night vision function was achieved. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of the low-light high-definition optical lens in an embodiment of the present invention;

[0031] Figure 2 This is a spherical aberration diagram of the low-light high-definition optical lens in an embodiment of the present invention;

[0032] Figure 3 This is a field curvature and distortion diagram of a low-light high-definition optical lens in an embodiment of the present invention;

[0033] Figure 4 This is a transverse chromatic aberration diagram of the low-light high-definition optical lens in an embodiment of the present invention;

[0034] Figure 5 This is an MTF curve of the low-light high-definition optical lens in an embodiment of the present invention.

[0035] In the picture:

[0036] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens; 5. Fifth lens; 6. Sixth lens; 7. Seventh lens; 8. Eighth lens; 9. Ninth lens; 10. Tenth lens; 11. Aperture; 12. Filter; 13. Photosensitive chip. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will be described in conjunction with the accompanying drawings of the embodiments of the present invention. Figure 1-5 The technical solutions of the embodiments of the present invention will be clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0038] like Figure 1As shown, a low-light high-definition optical lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10 arranged sequentially along the optical axis from the object plane to the image plane, a filter 12, and a photosensitive chip 13. The first lens 1 to the tenth lens 10 are all glass spherical lenses, and their focal lengths are positive, positive, negative, negative, positive, positive, positive, positive, positive, positive, negative, respectively. The second lens 2 and the third lens 3, the fourth lens 4 and the fifth lens 5, and the ninth lens 9 and the tenth lens 10 are all combined to form cemented lenses for eliminating chromatic aberration.

[0039] Generally, to achieve high-definition low-light performance, a lens needs to maintain focus at both high and low temperatures (+80°C to -40°C), requiring at least 14 glass elements. However, this invention utilizes a glass aspherical lens design, reducing the number of lens elements to 10. With just these 10 elements, an F-number of 1.4 is achieved, ensuring focus at both high and low temperatures (+85°C to -40°C). By reducing the number of lens elements from 14 to 10, the space occupied by the optical components is significantly reduced by four elements!

[0040] According to one embodiment of the present invention, the first lens 1, the third lens 3 and the seventh lens 7 are all negative meniscus lenses, the second lens 2 is a positive meniscus lens, the fourth lens 4 and the tenth lens 10 are both biconcave lenses, and the fifth lens 5, the sixth lens 6, the eighth lens 8 and the ninth lens 9 are all biconvex lenses.

[0041] The second lens 2, the fifth lens 5, and the ninth lens 9 are all made of ultra-low dispersion materials. The first lens 1, the third lens 3, and the eighth lens 8 are all made of high refractive index materials.

[0042] By selecting the right glass material and improving the lens shape, infrared confocal night vision functionality was achieved.

[0043] The second lens 2, the fifth lens 5, and the ninth lens 9 are all made of ultra-low dispersion materials, while the first lens 1, the third lens 3, and the eighth lens 8 are all made of high refractive index materials. This ensures functionality while reducing the number of lenses used, thereby reducing the overall length of the lens and greatly reducing the space occupied by optical components. Through optical design modifications, the overall optical length of the lens is finally reduced to less than 100mm.

[0044] The use of high-refractive-index lenses can effectively correct spherical aberration and coma, resulting in smaller residual spherical aberration and coma in the lens; the introduction of ultra-low dispersion lenses effectively reduces axial chromatic aberration in the optical system.

[0045] By using ultra-low dispersion materials in the second lens 2, the fifth lens 5, and the ninth lens 9, and using high refractive index materials in the first lens 1, the third lens 3, and the eighth lens 8, aberrations such as spherical aberration, coma, astigmatism, and field curvature can be effectively corrected, thereby improving the resolving quality of the lens and achieving ideal resolving power.

[0046] According to another embodiment of the present invention, an aperture stop 11 for limiting the light beam is installed between the fifth lens 5 and the sixth lens 6. The second lens 2, the fifth lens 5 and the ninth lens 9 are all made of ultra-low dispersion material, which is beneficial for correcting chromatic aberration and secondary spectrum. By arranging the lenses in an approximately symmetrical optical structure near the aperture stop 11, chromatic aberration is further reduced, thereby achieving an infrared confocal effect with an infrared defocusing amount of 0.006 mm.

[0047] In one embodiment of the present invention, as shown in Table 1:

[0048] The center thicknesses of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10 are 4.8mm, 5.7mm, 1.00mm, 1.00mm, 7.80mm, 7.13mm, 13.00mm, 4.35mm, 5.99mm, and 1.00mm, respectively.

[0049] The distances between the first lens 1 and the second lens 2, the third lens 3 and the fourth lens 4, the sixth lens 6 and the seventh lens 7, the seventh lens 7 and the eighth lens 8, and the eighth lens 8 and the ninth lens 9 are 13.07 mm, 5.37 mm, 1.34 mm, 0.09 mm, and 0.11 mm, respectively.

[0050] The radii of curvature on the object plane side of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10 are 51.77 mm, 20.68 mm, 347.80 mm, -30.77 mm, 18.34 mm, 107.80 mm, -28.29 mm, 45.82 mm, 28.33 mm, and -49.39 mm, respectively.

[0051] The radii of curvature on the image plane side of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, and the tenth lens 10 are 173.50 mm, 347.80 mm, 18.06 mm, 18.34 mm, -32.21 mm, -107.80 mm, -24.25 mm, -268.99 mm, -49.39 mm, and 17.82 mm, respectively.

[0052] Table 1

[0053] Face number Face type radius of curvature / mm Thickness / mm Material conic OBJ STANDARD infinity infinity 1 STANDARD 51.77 4.80 TAFD40 2 STANDARD 173.50 13.07 3 STANDARD 20.68 5.70 FCD515 4 STANDARD 347.80 1.00 TAFD55 5 STANDARD 18.06 5.37 6 STANDARD -30.77 1.00 H-ZF3 7 STANDARD 18.34 7.80 FCD515 8 STANDARD -32.21 0.15 STO STANDARD infinity 5.37 10 STANDARD 107.80 7.13 H-LAF53 11 STANDARD -107.80 1.34 12 STANDARD -28.29 13.00 H-QF1 13 STANDARD -24.25 0.09 14 STANDARD 45.82 4.35 FDS18 15 STANDARD -268.99 0.11 16 STANDARD 28.33 5.99 H-ZPK1A 17 STANDARD -49.39 1.00 H-ZF52A 18 STANDARD 17.82

[0054] In Table 1, surface numbers 1 and 2 represent the first surface and the second surface of the first lens 1, respectively.

[0055] The surface numbers 3, 4, and 5 represent the first, third, and second surfaces of the second lens 2 and the third lens 3, respectively.

[0056] The surface numbers 6, 7, and 8 represent the first, third, and second surfaces of the fourth lens 4 and the fifth lens 5, respectively.

[0057] Surface numbers 10 and 11 represent the first and second surfaces of the sixth lens 6, respectively;

[0058] Surface numbers 12 and 13 represent the first and second surfaces of the seventh lens 7, respectively;

[0059] Surface numbers 14 and 15 represent the first and second surfaces of the eighth lens 8, respectively;

[0060] The surface numbers 16, 17, and 18 represent the first, third, and second surfaces of the ninth lens 9 and the tenth lens 10, respectively.

[0061] The first surface refers to the side facing the object plane, the second surface refers to the side facing the image plane, and the third surface is the side shared by both lenses.

[0062] Based on the above technical solutions, the following conclusions are drawn. Figure 2 , Figure 3 , Figure 4 and Figure 5 .

[0063] Depend on Figure 2 It can be seen that, due to the use of high refractive index and ultra-low dispersion materials, spherical aberration and chromatic aberration can be corrected to within ±0.03mm. The spherical aberration is well corrected within the spectral bandwidth, which can increase the cleanliness of the actual image captured by the lens.

[0064] Depend on Figure 3 It can be seen that astigmatism and field curvature can be corrected to a suitable range so that the resolving power of the meridional direction can be consistent with the resolving power of the sagittal direction.

[0065] Depend on Figure 4 It can be seen that the chromatic aberration of the f-ray, d-ray, and c-ray relative to the chromatic aberration of the present invention is within 1.2μm, which fully meets our lens resolution quality requirements;

[0066] Depend on Figure 5It can be seen that the lens has excellent resolution, matched with a 1.1" image sensor 13, with high sharpness in the center field of view and within the 0.7 field of view, and a spatial frequency of 160 cycles / mm, and an MTF value close to 0.4 in the 1.0 field of view.

[0067] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the first feature being "above" or "below", "left" or "right" of the second feature may be in direct contact with the first feature, or indirect contact between the first and second features through an intermediate medium.

[0069] While various embodiments of the invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of the invention. The appended claims are intended to define the scope of the invention and therefore cover any modular compositions, equivalents, or alternatives within the scope of these claims.

Claims

1. A low-light high-definition optical lens, characterized in that: The system includes a first lens (1), a second lens (2), a third lens (3), a fourth lens (4), a fifth lens (5), a sixth lens (6), a seventh lens (7), an eighth lens (8), a ninth lens (9), a tenth lens (10), a filter (12), and a photosensitive chip (13) arranged sequentially from the object plane to the image plane along the optical axis. The first lens (1) to the tenth lens (10) are all glass spherical lenses, and the focal lengths of the first lens (1) to the tenth lens (10) are positive, positive, negative, negative, positive, positive, positive, positive, positive, positive, negative, positive, and negative, respectively. The center thicknesses of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), and the tenth lens (10) are 4.8 mm, 5.7 mm, 1.00 mm, 1.00 mm, 7.80 mm, 7.13 mm, 13.00 mm, 4.35 mm, 5.99 mm, and 1.00 mm, respectively.

2. The low-light high-definition optical lens according to claim 1, characterized in that: The second lens (2), the fifth lens (5) and the ninth lens (9) are all made of ultra-low dispersion materials.

3. The low-light high-definition optical lens according to claim 1, characterized in that: The first lens (1), the third lens (3) and the eighth lens (8) are all made of high refractive index material.

4. The low-light high-definition optical lens according to claim 1, characterized in that: An aperture stop (11) is provided between the fifth lens (5) and the sixth lens (6) to limit the beam.

5. The low-light high-definition optical lens according to claim 1, characterized in that: The distances between the first lens (1) and the second lens (2), the third lens (3) and the fourth lens (4), the sixth lens (6) and the seventh lens (7), the seventh lens (7) and the eighth lens (8), and the eighth lens (8) and the ninth lens (9) are 13.07 mm, 5.37 mm, 1.34 mm, 0.09 mm and 0.11 mm, respectively.

6. The low-light high-definition optical lens according to claim 1, characterized in that: The radii of curvature on the object side of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), and the tenth lens (10) are 51.77 mm, 20.68 mm, 347.80 mm, -30.77 mm, 18.34 mm, 107.80 mm, -28.29 mm, 45.82 mm, 28.33 mm, and -49.39 mm, respectively.

7. The low-light high-definition optical lens according to claim 6, characterized in that: The radii of curvature on the image plane side of the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7), the eighth lens (8), the ninth lens (9), and the tenth lens (10) are 173.50 mm, 347.80 mm, 18.06 mm, 18.34 mm, -32.21 mm, -107.80 mm, -24.25 mm, -268.99 mm, -49.39 mm, and 17.82 mm, respectively.

8. The low-light high-definition optical lens according to claim 1, characterized in that: The second lens (2) and the third lens (3), the fourth lens (4) and the fifth lens (5), the ninth lens (9) and the tenth lens (10) are all combined to form a cemented lens for eliminating chromatic aberration.

Images