An ultra-starlight-level high-definition optical lens

Abstract

The application discloses a super-starlight high-definition optical lens and relates to the technical field of optical lenses. The super-starlight high-definition optical lens has eight lens pieces with optical power. The optical lens is sequentially provided with a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens along the light direction from an object plane to an image plane. The second lens and the third lens are combined to form a cemented lens, and the fourth lens and the fifth lens are combined to form a cemented lens. The first lens, the fourth lens and the fifth lens are glass spherical lenses, and the rest are plastic aspherical lenses. The super-starlight high-definition optical lens provided in the application can realize the starlight function of the lens, high and low temperature non-focusing, high resolving power, night vision confocal and purple light halo.

Description

Technical Field

[0001] This application relates to the field of optical lens technology, and in particular to a super starlight-level high-definition optical lens. Background Technology

[0002] In recent years, with the continuous development of the optics industry, the demand for various optical lenses has been constantly changing. However, with the development of 5G and the emergence of the Internet of Things, some new industries have emerged, such as sensors with inherent intelligence, mobile terminals, industrial systems, building control systems, smart home facilities, and video surveillance systems. At the same time, technological reforms have also occurred in the fields of security and medicine, such as real-time online monitoring, location tracking, alarm linkage, dispatch and command, contingency plan management, remote control, security protection, remote maintenance, online upgrades, statistical reports, decision support, and management and service functions such as leadership desktops (centralized display Cockpit Dashboards). New technological demands are also constantly emerging, with high-definition lenses at the black light level, infrared confocal lenses, cost reduction, and improved lens stability becoming highlights that people are constantly pursuing.

[0003] Traditional zoom lenses currently on the market have one or more shortcomings in terms of high and low temperature, night vision, and purple halo. For example, they have poor night vision, severe purple halo, high cost, low yield, and difficulty in mass production. Their performance in high-end applications is not ideal and they urgently need improvement. Summary of the Invention

[0004] The purpose of this invention is to provide a super starlight-level high-definition optical lens that achieves the requirements of starlight function, focus stability at high and low temperatures, high resolution, night vision confocal focus, and purple halo.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: This invention provides a super-starlight-level high-definition optical lens, wherein the number of lenses with optical power in the super-starlight-level high-definition optical lens is 8; The optical lens is provided with the following elements arranged sequentially from the object plane to the image plane along the light direction: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; The second lens and the third lens are combined to form a cemented lens, and the fourth lens and the fifth lens are combined to form a cemented lens; The first lens, the fourth lens, and the fifth lens are all glass spherical lenses, while the rest are plastic aspherical lenses.

[0006] In some embodiments, the first lens, the fifth lens, the sixth lens, and the eighth lens are meniscus lenses; The second lens and the seventh lens are biconcave lenses; The third lens and the fourth lens are biconvex lenses.

[0007] In some embodiments, the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are negative, negative, positive, positive, negative, positive, negative, and positive, respectively.

[0008] In some embodiments, the FNo. of the super starlight-level high-definition optical lens is 1.6.

[0009] In some embodiments, an aperture stop is provided between the third lens and the fourth lens.

[0010] In some embodiments, it further includes: a photosensitive chip; The photosensitive chip is positioned after the eighth lens.

[0011] In some embodiments, it further includes: a filter; The filter is disposed between the eighth lens and the photosensitive chip.

[0012] The present invention provides a super-starlight-level high-definition optical lens, which has the following beneficial effects: 1. Implement starlight function (FNo. reaches 1.6): By using anomalous dispersion coefficient materials in the fourth and fifth lenses, spherical aberration and chromatic aberration in the optical system are reduced. The increased lens aperture primarily leads to increased spherical aberration and coma. The use of aspherical lenses in the sixth and seventh lenses effectively corrects spherical aberration and coma, resulting in minimal residual spherical aberration and coma. Through parametric correction using plastic aspherical lenses and the combined use of glass lenses, the lens achieves an f / 1.6 aperture.

[0013] 2. Achieve no scorch deviation at high and low temperatures: By employing glass spherical lenses in the first, fourth, and fifth lenses—for example, the fourth lens uses H-FK90 material with a relatively large temperature drift—the temperature drift of the optical system is controlled within a reasonable range. Simultaneously, a stable mechanical structure is selected for complementary use, thus achieving focus stability at both high and low temperatures. This precise combination of structure and optics enables focus-free operation at both high and low temperatures (high temperature +80℃, low temperature -40℃).

[0014] 3. Achieve a resolution of over 8 million pixels: By using high-dispersion materials in the fourth and fifth lenses, and aspherical lenses in the sixth and seventh lenses, spherical aberration and coma correction are effectively achieved. The eighth lens, using a low-dispersion plastic non-curved lens, further corrects residual aberrations, thus achieving ideal resolving power. Through multiple adjustments to optical simulation and structural tolerances, a resolution of 80% is achieved, reaching over 8 million pixels.

[0015] 4. Achieving night vision confocal focus and purple halo requirements: By using materials with significant dispersion differences in the second and third lenses, chromatic aberration is initially corrected. The fourth and fifth lenses, employing materials with abnormal dispersion coefficients, further reduce spherical aberration and second-order spectral distortion in the optical system. The sixth and seventh lenses, also using materials with significant dispersion differences, further optimize chromatic aberration, ensuring that light of different wavelengths converges. Through lens structure combinations and material selection, night vision confocalization and violet halo effects are achieved. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual process of the method, etc. involved in the embodiments of this disclosure.

[0017] Figure 1 This is a schematic diagram of the structure of an optical lens according to some embodiments of the present disclosure; Figure 2 This is a schematic diagram of chromatic aberration at the wide-angle end of an optical lens according to some embodiments of the present disclosure; Figure 3 This is a schematic diagram of chromatic aberration at the telephoto end of an optical lens according to some embodiments of the present disclosure; Figure 4 This is a schematic diagram of wide-angle astigmatism and distortion curves of an optical lens according to some embodiments of the present disclosure; Figure 5 This is a schematic diagram of astigmatism and distortion curves at the telephoto end of an optical lens according to some embodiments of the present disclosure. Figure 6 This is a schematic diagram of the lateral chromatic aberration curve at the wide-angle end of an optical lens according to some embodiments of the present disclosure; Figure 7 This is a schematic diagram of the transverse chromatic aberration curve at the telephoto end of an optical lens according to some embodiments of the present disclosure; Figure 8This is a schematic diagram of the wide-angle end MTF curve of an optical lens according to some embodiments of the present disclosure; Figure 9 This is a schematic diagram of the MTF curve at the telephoto end of an optical lens according to some embodiments of the present disclosure. Detailed Implementation

[0018] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0019] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, a particular feature, structure, material, or characteristic may be included in any suitable manner in any one or more embodiments or examples.

[0020] This invention provides a super-starlight-level high-definition optical lens, such as... Figure 1 As shown, the super-starlight high-definition optical lens has 8 lenses with optical power. The optical lens is arranged sequentially from the object plane to the image plane along the light direction, that is, from left to right: first lens 1, second lens 2, third lens 3, fourth lens 4, fifth lens 5, sixth lens 6, seventh lens 7 and eighth lens 8.

[0021] In some embodiments, the second lens 2 and the third lens 3 are combined to form a cemented lens, and the fourth lens 4 and the fifth lens 5 are combined to form a cemented lens.

[0022] In some embodiments, the first lens 1, the fourth lens 4, and the fifth lens 5 are all glass spherical lenses, while the rest are plastic aspherical lenses. That is, the second lens 2, the third lens 3, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are all plastic aspherical lenses.

[0023] The present invention provides a super-starlight-level high-definition optical lens, which has the following beneficial effects: 1. Implement starlight function (FNo. reaches 1.6): By using anomalous dispersion coefficient materials in the fourth and fifth lenses, spherical aberration and chromatic aberration in the optical system are reduced. The increased lens aperture primarily leads to increased spherical aberration and coma. The use of aspherical lenses in the sixth and seventh lenses effectively corrects spherical aberration and coma, resulting in minimal residual spherical aberration and coma. Through parametric correction using plastic aspherical lenses and the combined use of glass lenses, the lens achieves an f / 1.6 aperture.

[0024] 2. Achieve no scorch deviation at high and low temperatures: By employing glass spherical lenses in the first, fourth, and fifth lenses—for example, the fourth lens uses H-FK90 material with a relatively large temperature drift—the temperature drift of the optical system is controlled within a reasonable range. Simultaneously, a stable mechanical structure is selected for complementary use, thus achieving focus stability at both high and low temperatures. This precise combination of structure and optics enables focus-free operation at both high and low temperatures (high temperature +80℃, low temperature -40℃).

[0025] 3. Achieve a resolution of over 8 million pixels: By using high-dispersion materials in the fourth and fifth lenses, and aspherical lenses in the sixth and seventh lenses, spherical aberration and coma correction are effectively achieved. The eighth lens, using a low-dispersion plastic non-curved lens, further corrects residual aberrations, thus achieving ideal resolving power. Through multiple adjustments to optical simulation and structural tolerances, a resolution of 80% is achieved, reaching over 8 million pixels.

[0026] 4. Achieving night vision confocal focus and purple halo requirements: By using materials with significant dispersion differences in the second and third lenses, chromatic aberration is initially corrected. The fourth and fifth lenses, employing materials with abnormal dispersion coefficients, further reduce spherical aberration and second-order spectral distortion in the optical system. The sixth and seventh lenses, also using materials with significant dispersion differences, further optimize chromatic aberration, ensuring that light of different wavelengths converges. Through lens structure combinations and material selection, night vision confocalization and violet halo effects are achieved.

[0027] In some embodiments, the first lens 1, the fifth lens 5, the sixth lens 6, and the eighth lens 8 are meniscus lenses, the second lens 2 and the seventh lens 7 are biconcave lenses, and the third lens 3 and the fourth lens 4 are biconvex lenses.

[0028] In some embodiments, the focal lengths 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, and the eighth lens 8 are negative, negative, positive, positive, negative, positive, negative, and positive, respectively.

[0029] In some embodiments, the FNo. of the super starlight-level high-definition optical lens is 1.6.

[0030] In some embodiments, such as Figure 1 As shown, an aperture stop 10 is provided between the third lens 3 and the fourth lens 4.

[0031] Aperture 10 refers to an entity in an optical system that limits the beam of light, either by restricting the beam or by limiting the size of the field of view (imaging range).

[0032] In some embodiments, adjusting the distance between the third lens 3 and the aperture stop 10, and between the aperture stop 10 and the fourth lens 4, can achieve the function of optical lens zoom. Specific parameters are shown in Table 1. Table 1: Zoom Parameters Wide-angle end 131 12.2mm 8.902mm telephoto end 26.5 2.105mm 0.607mm As shown in Table 1, the distance between the third lens 3 and the aperture stop 10 ranges from 2.105mm to 12.2mm, and the distance between the aperture stop 10 and the fourth lens 4 ranges from 0.607mm to 8.902mm, thus achieving a field of view (FOV) range of 26.5 to 131.

[0033] In some embodiments, such as Figure 1 As shown, the optical lens also includes a photosensitive chip 11, which is disposed after the eighth lens 8.

[0034] In some embodiments, such as Figure 1 As shown, the optical lens further includes a filter 9, which is disposed between the eighth lens 8 and the photosensitive chip 11. The filter 9 can protect the photosensitive chip 11 and filter out stray light outside the required wavelength range, thereby improving image quality.

[0035] The aspherical surface profiles of the second lens 2, the third lens 3, the sixth lens 6, the seventh lens 7, and the eighth lens 8 in the optical lens of this invention satisfy the following formula: Where: c is the curvature corresponding to the radius, y is the radial coordinate, the unit of the radial coordinate is the same as the unit of the lens length, and k is the conic quadratic coefficient; When k < -1, the surface profile of the lens is a hyperbola; When k=-1, the surface profile of the lens is a parabola; When -1 < k < 0, the surface curve of the lens is an ellipse; When k=0, the surface profile of the lens is circular; When k > 0, the surface curve of the lens is an oblate shape; a 2~ a8 represents the coefficients corresponding to each radial coordinate. These parameters allow for precise setting of the shape and dimensions of the two aspherical surfaces at the front and back of the lens.

[0036] The aforementioned super-starlight high-definition optical lens comprises eight lenses and filters 9. Except for the second lens 2, third lens 3, fourth lens 4, and fifth lens 5, which combine to form a cemented lens, each lens and filter 9 has two sides, totaling 17 sides. To meet the aforementioned performance parameter requirements, the structural parameters of each side of the eight lenses and filters 9 are further described below. The lens structural parameters from left to right are shown in Table 2. Table 2: Structural parameters of each lens and filter [1] STANDARD 41.0936284 0.93 H-LAK2 [2] STANDARD 6.913781225 5.459740247 [3] EVENASPH -18.05915037 1.60505734 K26R -2.7152508 [4] EVENASPH 10.00004504 2.381030083 EP-5000 -16.931227 [5] EVENASPH 188.3180282 12.20091617 STO STANDARD infinity 8.90146482 [7] STANDARD 6.695300576 4.800217359 H-FK90 [8] STANDARD -7.059485879 0.889384739 S-LAK51A [9] STANDARD -16.38886185 0.086

[10] EVENASPH 6.392155184 1.573032337 F52R -3.4289308

[11] EVENASPH 13.76160356 0.412370934 2.60131555

[12] EVENASPH -12.59772828 0.804910439 EP-5000 -2.9590436

[13] EVENASPH 41.60047349 1.740469761 85.707036

[14] EVENASPH 8.286549668 2.079129241 K26R -14.289231

[15] EVENASPH 21.5948682 0.5 -98.218729

[16] STANDARD infinity 0.7 H-K9L

[17] STANDARD infinity 5.596678514 Table 3: Aspheric Coefficients [3] -1.05E-04 -1.66E-06 -1.40E-08 -4.93E-10 0.00E+00 0.00E+00 0.00E+00 [4] 1.20E-03 -4.37E-05 8.57E-07 -8.96E-09 -3.67E-10 8.89E-12 0.00E+00 [5] -1.55E-04 4.89E-06 -3.29E-07 6.73E-09 -8.11E-11 7.67E-13 0.00E+00

[10] 5.71E-04 -2.34E-05 -1.01E-05 -6.72E-07 7.82E-08 -4.81E-10 -1.99E-11

[11] -1.70E-03 -1.76E-04 1.45E-05 3.23E-07 -1.59E-07 7.96E-09 2.99E-11

[12] 1.45E-03 1.73E-04 1.67E-05 -1.75E-06 -6.25E-08 5.54E-09 4.62E-12

[13] 1.34E-04 5.67E-04 -3.71E-05 2.91E-06 -1.72E-07 1.71E-09 -2.27E-10

[14] -5.97E-04 -2.61E-04 5.57E-05 -6.69E-06 6.05E-07 -2.87E-08 3.52E-10

[15] -4.16E-04 -1.31E-04 1.57E-05 -7.56E-07 5.36E-08 -2.26E-09 -8.52E-11 In Tables 2 and 3 above: Surface numbers [1] and [2] respectively represent the first and second surfaces of the first lens 1, and the material of the first lens 1 is H-LAK2; Surface numbers [3] and [4] represent the first and second surfaces of the second lens 2, respectively. The material of the second lens 2 is K26R. Surface numbers [4] and [5] represent the first and second surfaces of the third lens 3, respectively. The material of the third lens 3 is EP-5000. Surface numbers [7] and [8] represent the first and second surfaces of the fourth lens 4, respectively. The material of the fourth lens 4 is H-FK90. Surface numbers [8] and [9] represent the first and second surfaces of the fifth lens 5, respectively. The material of the fifth lens 5 is S-LAK51A. Surface numbers

[10] and

[11] represent the first and second surfaces of the sixth lens 6, respectively. The material of the sixth lens 6 is F52R. Surface numbers

[12] and

[13] represent the first and second surfaces of the seventh lens 7, respectively. The material of the seventh lens 7 is EP-5000. Surface numbers

[14] and

[15] represent the first and second surfaces of the eighth lens 8, respectively. The material of the eighth lens 8 is K26R. Surface numbers

[16] and

[17] represent the first and second surfaces of filter 9, respectively, and the material of filter 9 is H-K9L; The first surface refers to the side facing the object plane, and the second surface refers to the side facing the image plane.

[0037] By adopting the above technical solutions, such as Figure 2-3 As shown, spherical aberration is corrected to within ±0.02mm, which provides good spherical aberration correction within the spectral bandwidth, thus increasing the cleanliness of the image captured by the lens. Figure 4-5As shown, due to the use of glass aspherical lenses and high-refractive-index lenses, astigmatism and field curvature can be corrected to a suitable range, allowing the meridional resolving power to be close to the sagittal resolving power. Figure 6-7 As shown, chromatic aberration along the transverse axis, specifically the chromatic aberrations of f-ray, d-ray, and c-ray relative to the transverse axis, must be within 2μm to meet the lens's resolution quality requirements. For example... Figure 8-9 As shown in the MTF curve, this lens has excellent resolution, high sharpness in the center field of view and within the 0.7 field of view, and a spatial frequency of 200 cycles / mm.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention, as long as they do not depart from the spirit and scope of the technical solutions of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A super-starlight-level high-definition optical lens, characterized in that, The super-starlight high-definition optical lens has 8 lenses with optical power; the optical lens is arranged sequentially from the object plane to the image plane along the light direction as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; the second lens and the third lens are combined to form a cemented lens, and the fourth lens and the fifth lens are combined to form a cemented lens; the first lens, the fourth lens, and the fifth lens are all glass spherical lenses, and the rest are plastic aspherical lenses; The first lens, the fifth lens, the sixth lens, and the eighth lens are meniscus lenses; the second lens and the seventh lens are biconcave lenses; and the third lens and the fourth lens are biconvex lenses. The focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are negative, negative, positive, positive, negative, positive, negative, and positive, respectively. The first lens has a radius of curvature of 41.0936284 mm on the object plane side and a radius of curvature of 6.913781225 mm on the image plane side. Its center thickness is 0.93 mm, and the air gap between it and the second lens is 5.459740247 mm. The material of the first lens is H-LAK2. The second lens has a radius of curvature of -18.05915037 mm on the object side and a radius of curvature of 10.00004504 mm on the image side, with a center thickness of 1.60505734 mm; the material of the second lens is K26R. The third lens has a radius of curvature of 10.00004504 mm near the object plane and a radius of curvature of 188.3180282 mm near the image plane. Its center thickness is 2.381030083 mm, and the air gap between it and the fourth lens is 12.20091617 mm. The material of the third lens is EP-5000. The radius of curvature of the fourth lens near the object plane is 6.695300576 mm, the radius of curvature near the image plane is -7.059485879 mm, and the center thickness is 4.800217359 mm; the material of the fourth lens is H-FK90. The fifth lens has a radius of curvature of -7.059485879 mm near the object plane and a radius of curvature of -16.38886185 mm near the image plane. Its center thickness is 0.889384739 mm, and the air gap between it and the sixth lens is 0.086 mm. The material of the fifth lens is S-LAK51A. The radius of curvature of the sixth lens near the object plane is 6.392155184 mm, the radius of curvature near the image plane is 13.76160356 mm, the center thickness is 1.573032337 mm, and the air gap between it and the seventh lens is 0.412370934 mm; the material of the sixth lens is F52R. The seventh lens has a radius of curvature of -12.59772828 mm near the object plane and a radius of curvature of 41.60047349 mm near the image plane. Its center thickness is 0.804910439 mm, and the air gap between it and the eighth lens is 1.740469761 mm. The material of the seventh lens is EP-5000. The radius of curvature of the eighth lens near the object plane is 8.286549668 mm, the radius of curvature near the image plane is 21.5948682 mm, and the center thickness is 2.079129241 mm; the material of the eighth lens is K26R.

2. The super-starlight-level high-definition optical lens as described in claim 1, characterized in that, The FNo. of the super-starlight-level high-definition optical lens is 1.

6.

3. The super-starlight-level high-definition optical lens as described in claim 1, characterized in that, An aperture stop is provided between the third lens and the fourth lens.

4. The super-starlight-level high-definition optical lens as described in claim 1, characterized in that, Also includes: Photosensitive chip; The photosensitive chip is positioned after the eighth lens.

5. The super-starlight-level high-definition optical lens as described in claim 4, characterized in that, Also includes: A filter; the filter is disposed between the eighth lens and the photosensitive chip.

Images