An optical system and an optical lens

Abstract

The present invention provides an optical system, comprising: a first lens; a first cemented lens disposed on the image side of the first lens, with a first optical interval between the first cemented lens and the first lens; a second cemented lens disposed on the image side of the first cemented lens, with a second optical interval between the first cemented lens and the second cemented lens; a second lens disposed on the image side of the second cemented lens, with a third optical interval between the second cemented lens and the second lens; wherein the first lens, the first cemented lens, the second cemented lens and the second lens are arranged in sequence along the principal optical axis, and the first optical interval and the third optical interval are adjusted according to the optical magnification of the optical system, and the first optical interval is smaller than the third optical interval. The optical system provided by the present invention can achieve multiple different magnifications.

Description

Technical Field

[0001] The present invention relates to the field of visual detection technology, and particularly relates to an optical system and an optical lens. Background Art

[0002] In visual projects, the primary basis for choosing an optical lens is the field of view. Whether a lens is usable depends first on whether the field of view can meet the needs of the detection object. The field of view of a lens is actually the optical magnification of the lens. With the increasing practical development of visual applications in the industrial field, the range of the optical magnification of lenses is also constantly expanding, and more and more lens products with different optical magnification models are continuously produced. This actually causes a rather troublesome problem, namely waste in the production process, because behind each optical magnification there will be corresponding designs, corresponding processing of cemented lenses, inventory pressure, and cost pressure, which are actually a burden for both the factory and the customers. Summary of the Invention

[0003] In view of the defects of the above-mentioned prior art, the present invention proposes an optical system to achieve different optical magnifications in one optical system.

[0004] To achieve the above object and other objects, the present invention proposes an optical system, including,

[0005] A first lens;

[0006] A first cemented lens, disposed on the image side of the first lens, and having a first optical interval between the first cemented lens and the first lens;

[0007] A second cemented lens, disposed on the image side of the first cemented lens, and having a second optical interval between the first cemented lens and the second cemented lens;

[0008] A second lens, disposed on the image side of the second cemented lens, and having a third optical interval between the second cemented lens and the second lens;

[0009] Wherein, the first lens, the first cemented lens, the second cemented lens and the second lens are arranged in sequence along the principal optical axis, and the first optical interval and the third optical interval are adjusted according to the optical magnification of the optical system, and the first optical interval is less than the third optical interval.

[0010] Further, the first lens is a biconvex lens, and the second lens is a convex-concave lens.

[0011] Further, the first optical interval is between 0.5 mm and 2.1 mm, and the third optical interval is between 6 mm and 25.7 mm.

[0012] Further, the tolerance of the first optical interval is less than 0.5 mm, the tolerance of the second optical interval is less than 1.5 mm, and the tolerance of the third optical interval is less than 0.5 mm.

[0013] Further, the tolerance of the optical interval between the second lens and the imaging plane is less than 1 mm.

[0014] Further, the parallel deviation angle between the principal optical axis and the incident ray on the object side and the outgoing ray on the image plane is between 40.7° and 40.9°.

[0015] Further, it further includes a diaphragm, and the diaphragm is arranged between the first cemented lens and the second cemented lens.

[0016] Further, the object surface of the first lens is a convex spherical surface, and the radius of curvature of the object surface of the first lens is between 15 and 16 mm; the image surface of the first lens is a convex spherical surface, and the radius of curvature of the image surface of the first lens is between 15 and 16 mm.

[0017] Further, the object surface of the second lens is a convex spherical surface, and the radius of curvature of the object surface of the second lens is between 13 and 14 mm; the image surface of the second lens is a concave spherical surface, and the radius of curvature of the image surface of the first lens is between 11 and 12 mm.

[0018] Further, the first cemented lens includes a first lens and a second lens. The radius of curvature of the object surface of the first lens is between 10 and 11 mm, and the radius of curvature of the image surface of the first lens is between 4 and 5 mm; the object surface of the second lens is cemented to the image surface of the first lens, the radius of curvature of the object surface of the second lens is the same as that of the image surface of the first lens, and the radius of curvature of the image surface of the second lens is between 11 and 12 mm.

[0019] Further, the second cemented lens includes a third lens and a fourth lens. The radius of curvature of the object surface of the third lens is between 28 and 29 mm, and the radius of curvature of the image surface of the third lens is between 5 and 6 mm; the object surface of the fourth lens is cemented to the image surface of the third lens, the radius of curvature of the object surface of the fourth lens is the same as that of the third lens, and the radius of curvature of the image surface of the fourth lens is between 9 and 10 mm.

[0020] Further, the optical magnification of the optical system is between 0.3 and 0.8.

[0021] Further, this embodiment also proposes an optical lens, including

[0022] a housing;

[0023] an optical system, arranged in the housing, and the optical system includes

[0024] The first lens;

[0025] The first cemented lens, disposed on the image side of the first lens, with a first optical interval between the first cemented lens and the first lens;

[0026] The second cemented lens, disposed on the image side of the first cemented lens, with a second optical interval between the first cemented lens and the second cemented lens;

[0027] The second lens, disposed on the image side of the second cemented lens, with a third optical interval between the second cemented lens and the second lens;

[0028] Wherein, the first lens, the first cemented lens, the second cemented lens and the second lens are arranged in sequence along the principal optical axis, the first optical interval and the third optical interval are adjusted according to the optical magnification of the optical system, and the first optical interval is less than the third optical interval.

[0029] In summary, the present invention provides an optical system and an optical lens. By adjusting the first optical interval, the second optical interval and the third optical interval, the optical system can achieve different optical magnifications, that is, multiple different optical magnifications can be realized in one optical system. At the same time, within the optical magnification range of the optical system, all lenses can be applied, thereby reducing the processing cost. Brief Description of the Drawings

[0030] Figure 1 : The optical system proposed in this embodiment.

[0031] Figures 2A - 2F : The field diagram and distortion diagram of the optical system in this embodiment.

[0032] Figures 3A - 3F : The Fourier transform modulation transfer function (FFT MTF) diagram of the optical system in this embodiment.

[0033] Figures 4A - 4F : The image plane illuminance diagram of the optical system in this embodiment.

[0034] Figures 5A - 5F : The schematic diagram of the circle of confusion of the optical system in this embodiment.

[0035] Figure 6 : The schematic diagram of the optical lens proposed in this embodiment. Detailed Description of the Embodiment

[0036] The following specific examples illustrate the embodiments of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0037] It should be noted that the illustrations provided in this embodiment only schematically illustrate the basic concept of the present invention. Therefore, only the components related to the present invention are shown in the drawings, rather than being drawn according to the number, shape, and size of the components in actual implementation. The type, quantity, and ratio of each component in actual implementation can be arbitrarily changed, and the layout type of its components may also be more complex.

[0038] As Figure 1 shown, in this embodiment, an optical system 100 is proposed. The optical system 100 includes a first lens 101, a first cemented lens 102, a second cemented lens 103, and a second lens 104. The first lens 101, the first cemented lens 102, the second cemented lens 103, and the second lens 104 are arranged in sequence from the object side to the image side along the principal optical axis. There is a preset optical interval between the first lens 101, the first cemented lens 102, the second cemented lens 103, and the second lens 104.

[0039] As Figure 1 shown, in this embodiment, the first lens 101 can be a biconvex lens, that is, the object surface of the first lens 101 is a convex spherical surface, and the image surface of the first lens 101 is a convex spherical surface. In this embodiment, the object surface refers to the side of the lens facing the object side, and the image surface refers to the side of the lens facing the image side. The left side of the first lens 101 is the object surface, and the right side of the first lens 101 is the image surface. The object surface of the first lens 101 is a convex spherical surface, and the radius of curvature of the object surface of the first lens 101 is, for example, between 15.9 - 16 mm, for example, 15.971 mm. The image surface of the first lens 101 is a convex spherical surface, and the radius of curvature of the image surface of the first lens 101 is, for example, between 15.9 - 16 mm, for example, -15.971 mm. The first lens 101 can be made of crown glass, for example. It should be noted that the "-" in "-15.971 mm" only represents the direction of the radius of curvature.

[0040] As Figure 1As shown, in this embodiment, the first cemented lens 102 is located on the image side of the first lens 101. The first cemented lens includes a first lens element 1021 and a second lens element 1022. The object surface of the first lens element 1021 is a concave spherical surface. The curvature radius of the object surface of the first lens element 1021 is, for example, between 10 and 11 mm, or, for example, between 10.5 and 10.6 mm, such as -10.569 mm. The image surface of the first lens element 1021 is a concave spherical surface. The curvature radius of the image surface of the first lens element 1021 is smaller than the curvature radius of the object surface of the first lens element 1021. The curvature radius of the image surface of the first lens element 1021 is, for example, between 4 and 5 mm, or, for example, between 4.9 and 5 mm, such as 4.962 mm. The object surface of the second lens element 1022 is a convex spherical surface. The object surface of the second lens element 1022 is cemented to the image surface of the first lens element 1021. The curvature radius of the object surface of the second lens element 1022 is the same as the curvature radius of the curved surface of the image surface of the first lens element 1021. The image surface of the second lens element 1022 is a concave spherical surface. The curvature radius of the image surface of the second lens element 1022 is, for example, between 11 and 12 mm, or, for example, between 11.1 and 11.2 mm, such as 11.128 mm. In this embodiment, the object surface of the first lens element 1021 can be defined as the object surface of the first cemented lens 102, and the image surface of the second cemented lens 1022 can be defined as the image surface of the first cemented lens 102. The first lens element 1021 can, for example, be made of barium crown glass, and the second lens element 1022 can, for example, be made of lanthanum flint glass. It should be noted that the "-" in -10.569 mm only represents the direction of the curvature radius.

[0041] As Figure 1As shown, in this embodiment, the second cemented lens 103 is located on the image side of the first cemented lens 102. The second cemented lens 103 includes a third lens 1031 and a fourth lens 1032. The object surface of the third lens 1031 is a convex spherical surface. The radius of curvature of the object surface of the third lens 1031 is, for example, between 28 - 29 mm, or between 28.2 - 28.3 mm, such as 28.209 mm. The image surface of the third lens 1031 is a convex spherical surface. The radius of curvature of the image surface of the third lens 1031 is smaller than that of the object surface of the third lens 1031. The radius of curvature of the image surface of the third lens 1031 is, for example, between 5 - 6 mm, or between 5.1 - 5.2 mm, such as -5.166 mm. The object surface of the fourth lens 1032 is a concave spherical surface. The object surface of the fourth lens 1032 is cemented to the image surface of the third lens 1031. The radius of curvature of the object surface of the fourth lens 1032 is the same as that of the image surface of the third lens 1031. The image surface of the fourth lens 1032 is a convex spherical surface. The radius of curvature of the image surface of the fourth lens 1032 is, for example, between 9 - 10 mm, or between 9.2 - 9.3 mm, such as -9.236 mm. In this embodiment, the object surface of the third lens 1031 can be defined as the object surface of the second cemented lens 103, and the image surface of the fourth cemented lens 1032 can be defined as the image surface of the second cemented lens 103. The third lens 1031 can be made of crown glass, for example, and the fourth lens 1032 can be made of heavy flint glass.

[0042] As Figure 1 shown, in this embodiment, the first cemented lens 102 and the second cemented lens 103 are, for example, doublet lenses. The surfaces of the doublet lenses are coated with broadband anti-reflection multilayer films for visible light (400 - 700 nm). The two cemented pieces of the first cemented lens 102 and the second cemented lens 103 can be fixed with an optical colloid, or of course, mechanical means (such as positioning grooves) can also be used to clamp and fix them.

[0043] As Figure 1 shown, in this embodiment, the second lens 104 is located on the image side of the second cemented lens 103. The second lens 104 can be a meniscus lens. The object surface of the second lens 104 is a convex spherical surface. The radius of curvature of the object surface of the second lens 104 is, for example, between 13 - 14 mm, or between 13.8 - 13.9 mm, such as 13.884 mm. The image surface of the second lens 104 is a concave spherical surface. The radius of curvature of the image surface of the second lens 104 is smaller than that of the object surface of the second lens 104. The radius of curvature of the image surface of the second lens 104 is, for example, between 11 - 12 mm, or between 11.9 - 12 mm, such as 11.912 mm. In this embodiment, the second lens 104 can be made of heavy flint glass, for example.

[0044] It should be noted that, in order to ensure the imaging quality, the tolerance of the curvature radius of each of the lenses is constrained within 3 - 5 Newton rings, for example, the tolerance of the curvature radius of the first lens 101 is constrained within 5 Newton rings, and the tolerance of the curvature radius of the second lens 104, the first cemented lens 102, and the second cemented lens 103 is constrained within 3 Newton rings. The shape parameters of each of the lenses can be flexibly adjusted as needed and are not limited to the parameters listed above.

[0045] As Figure 1 shown, in order to limit the light beam or the size of the field of view (imaging range), a diaphragm 106 can also be provided in the optical system of this embodiment. The diaphragm 106 is provided between the first cemented lens 102 and the second cemented lens 103. In addition, the diaphragm 106 can also be used to shape and optimize the light beam to improve the beam quality. As an example, the diaphragm 106 can be, for example, the edge of the lens, the frame, or a specially provided perforated screen. That is to say, in other embodiments, the optical system may not specifically provide the diaphragm 106, but use the edge of the lens, the frame, etc. as the diaphragm 106.

[0046] In this embodiment, considering high temperature sensitivity and imaging quality, each of the lenses of the optical system can be, for example, a glass lens. It can be understood that, in other embodiments, all the lenses of the optical system can also be a combination of glass lenses and plastic lenses, or all plastic lenses.

[0047] As Figure 1 shown, in this embodiment, there is a first optical interval A between the first lens 101 and the first cemented lens 102, a second optical interval B between the first cemented lens 102 and the second cemented lens 103, a third optical interval C between the second cemented lens 103 and the second lens 104, and a fourth optical interval D between the second lens 104 and the imaging plane 105. It should be noted that since the diaphragm 106 is located between the first cemented lens 102 and the second cemented lens 103, the second optical interval B is divided into a first sub - interval B1 and a second sub - interval B2, where the first sub - interval B1 is defined as the optical interval between the first cemented lens 102 and the diaphragm 106, and the second sub - interval B2 is defined as the optical interval between the diaphragm 106 and the second cemented lens 103.

[0048] As Figure 1 shown, in this embodiment, by adjusting the optical intervals between the first lens 101, the first cemented lens 102, the second cemented lens 103, and the second lens 104, that is, adjusting the first optical interval A, the second optical interval B, and the third optical interval C, various different optical magnifications can be achieved through this optical system 100.

[0049] AsFigure 1As shown, in this embodiment, the optical magnification of the optical system 100 can vary from 0.3 to 0.8. For example, when the optical magnification of the optical system 100 is 0.3, the first optical interval A can be 1.503 mm, the first sub-interval B1 can be 7.868 mm, the second sub-interval B2 can be 5.032 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 7.504 mm, and the fourth optical interval D can be 18 mm. Another example is when the optical magnification of the optical system 100 is 0.4, the first optical interval A can be 1.046 mm, the first sub-interval B1 can be 7.813 mm, the second sub-interval B2 can be 0.100 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 11.550 mm, and the fourth optical interval D can be 19.175 mm. Another example is when the optical magnification of the optical system 100 is 0.5, the first optical interval A can be 1.424 mm, the first sub-interval B1 can be 4.709 mm, the second sub-interval B2 can be 0.285 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 14.941 mm, and the fourth optical interval D can be 20.661 mm. Another example is when the optical magnification of the optical system 100 is 0.6, the first optical interval A can be 1.497 mm, the first sub-interval B1 can be 0.461 mm, the second sub-interval B2 can be 0.099 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 24.119 mm, and the fourth optical interval D can be 25.718 mm. Another example is when the optical magnification of the optical system 100 is 0.7, the first optical interval A can be 1.478 mm, the first sub-interval B1 can be 2.917 mm, the second sub-interval B2 can be 0.118 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 16.644 mm, and the fourth optical interval D can be 23.329 mm. Another example is when the optical magnification of the optical system 100 is 0.8, the first optical interval A can be 1.481 mm, the first sub-interval B1 can be 0.461 mm, the second sub-interval B2 can be 1.163 mm, the second optical interval B is equal to the sum of the first sub-interval B1 and the second sub-interval B2, the third optical interval C can be 20.612 mm, and the fourth optical interval D can be 24.371 mm.According to the above description, when the optical magnification of the optical system 100 is 0.3, the first optical interval A is less than the third optical interval C, the third optical interval C is less than the second optical interval B, and the second optical interval B is less than the fourth optical interval D; when the optical magnification of the optical system 100 is 0.4, 0.5, 0.7 or 0.8, the first optical interval A is less than the second optical interval B, the second optical interval B is less than the third optical interval C, and the third optical interval C is less than the fourth optical interval D; when the optical magnification of the optical system 100 is 0.6, the second optical interval B is less than the first optical interval A, the first optical interval A is less than the third optical interval C, and the third optical interval C is less than the fourth optical interval D. It should be noted that the optical magnification of the optical system 100 includes but is not limited to 0.3 - 0.8. The optical magnification of the optical system 100 can also be 0.9, 1.0 or other magnifications. In this embodiment, it should be noted that when the optical system 100 forms different magnifications, the tolerance of the first optical interval A is, for example, + / -0.5 mm; the tolerance of the second optical interval B is, for example, + / -1.5 mm; the tolerance of the third optical interval C is, for example, + / -1.5 mm; the tolerance of the fourth optical interval D is, for example, + / -1 mm.

[0050] As Figure 1 shown, in this embodiment, the parallel deviation angle between the principal optical axis of the optical system 100 and the incident light on the object side is between 40.7° - 40.9°, for example, 40.8°, that is, the field of view angle of the optical system 100 is between 40.7° - 40.9°, for example, 40.8°; the parallel deviation angle between the principal optical axis of the optical system 100 and the outgoing light on the image side is between 40.7° - 40.9°, for example, 40.8°.

[0051] It should be noted that the working wavelength of the optical system 100 is between 486 - 656 nm. The first lens 101 and the second lens 104 are used to adjust the optical magnification of the optical system 100, that is, to adjust the object-image ratio relationship. The first cemented lens 102 and the second cemented lens 103 are used to control the effective clear aperture, reduce the axial chromatic aberration and the lateral chromatic aberration. The combination of the first lens 1021, the second lens 1022, the third lens 1031 and the fourth lens 1032 can correct other monochromatic optical aberrations as a whole.

[0052] As Figures 2A - 2F shown, Figures 2A - 2F the left figure in Figures 2A - 2F shows the field curvature diagram of the optical system, Figures 2A - 2F the right figure inFigures 2A - 2F The right figure in Figures 2A - 2F shows the distortion diagrams of the optical system when the optical magnification is 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. In the left figure of Figures 2A - 2F , the solid line represents the meridional curve, and the dashed line represents the sagittal curve. The abscissa is in millimeters, and the ordinate corresponds to the (semi-)field of view interval Y+ of the optical system. The solid line represents the meridional curves at wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm from left to right in sequence, and the dashed line represents the sagittal curves at wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm in the working band from left to right in sequence. In the right figure of Figures 2A - 2F , the abscissa is the distortion percentage, and the ordinate corresponds to the (semi-)field of view interval Y+ of the optical system. The three overlapping curves represent the distortion diagrams of the optical system at wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm respectively.

[0053] As Figures 3A - 3F shown, Figures 3A - 3F shows the Fourier transform modulation transfer function (FFT MTF) diagrams of the optical system when the optical magnification is 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. In Figures 3A - 3F , the abscissa is the spatial frequency, and the ordinate is the modulus of the optical transfer function (Modulus of the OTF). It can be seen from Figures 3A - 3F the spatial transfer function of the entire optical system under the working band, which is one of the performance parameters of the entire optical system when working in this band and is a way to evaluate the resolution of the entire system. The corresponding curves for different fields of view are shown in the figure. It should be noted that Figures 3A - 3F the working wavelength of the modulation transfer function diagram is in the range of 486.1 nm - 656.3 nm.

[0054] As Figures 4A - 4F shown, Figures 4A - 4F shows the image plane illumination diagrams of the optical system when the optical magnification is 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. In Figures 4A - 4F , the abscissa is the (semi-)field of view interval, and the ordinate is the relative illumination (RelativeIllumination). The relative illumination mainly reflects the light distribution in different regions of the image plane after the light passes through the optical system, reflects the attenuation of the illuminance in different fields of view, and is an important index for evaluating the image plane illumination of the entire optical system. Figures 4A - 4FThe image plane illuminance curve in [it] is between 0.9 and 1.0, indicating that the uniformity of illuminance will also change accordingly with the change of the field of view size. However, Figures 4A - 4F It can be seen that the image plane illuminance curve is close to 1.0, indicating that the illuminance is very uniform within the entire field of view and the attenuation can be ignored. It should be noted that Figures 4A - 4F The working wavelength of the image plane illuminance diagram in [it] is 587.5 nm.

[0055] Such as Figures 5A - 5F , Figures 5A - 5F It shows the circle of confusion diagrams when the optical magnifications of the optical system are 0.3, 0.4, 0.5, 0.6, 0.7, and 0.8. Figures 5A - 5F It shows the circle of confusion diagrams of the optical system at wavelengths of 486.1 nm, 587.6 nm, and 656.3 nm. Figures 5A - 5F It reflects the situation of imaging aberrations in different fields of view and the distribution of aberrations in different field of view regions, which is also an important way to evaluate the overall imaging characteristics of an optical system. From Figures 5A - 5F It can be observed that the aberrations in each field of view have been corrected to the limit.

[0056] Such as Figure 6 As shown, this embodiment also proposes an optical lens 200, which includes a housing 210 and an optical system 220. The optical system 220 is disposed within the housing 210. The structure of the optical system 220 can be referred to Figure 1 and the above description. This embodiment will not elaborate on the optical system 220.

[0057] Such as Figure 6 As shown, the optical lens 200 can be used, for example, in industrial cameras, machine vision inspection devices, industrial inspection microscopes, scanning devices, photographic devices, projection devices, or the automotive field; the photographic device can specifically be an electronic device such as a mobile phone and a laptop computer that can perform video or image acquisition, and the industrial inspection microscope is, for example, a metallurgical microscope.

[0058] In summary, the present invention proposes an optical system and an optical lens. By adjusting the first optical interval, the second optical interval, and the third optical interval, multiple different optical magnifications can be achieved in the optical system, thereby reducing production costs.

[0059] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept, such as the technical solutions formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

[0060] Except for the technical features described in the specification, the remaining technical features are well-known technologies to those skilled in the art. To highlight the innovative features of the present invention, the remaining technical features will not be elaborated herein.

Claims

1. An optical system, characterized in that, Comprising the following, A first lens; A first cemented lens, disposed on the image side of the first lens, with a first optical interval between the first cemented lens and the first lens; A second cemented lens, disposed on the image side of the first cemented lens, with a second optical interval between the first cemented lens and the second cemented lens; A second lens, disposed on the image side of the second cemented lens, with a third optical interval between the second cemented lens and the second lens; Wherein, the first lens, the first cemented lens, the second cemented lens and the second lens are arranged in sequence along the principal optical axis, the first optical interval and the third optical interval are adjusted according to the optical magnification of the optical system, and the first optical interval is less than the third optical interval; The first lens and the second cemented lens have positive refractive powers, and the first cemented lens and the second lens have negative refractive powers; The object surface of the second lens is a convex spherical surface, the image surface of the second lens is a concave spherical surface, and the radius of curvature of the image surface of the second lens is less than the radius of curvature of the object surface of the second lens; The first cemented lens includes a first lens and a second lens, the object surface of the first lens is a concave spherical surface, the image surface of the first lens is a concave spherical surface, the object surface of the second lens is a convex spherical surface, and the image surface of the second lens is a concave spherical surface; The second cemented lens includes a third lens and a fourth lens, the object surface of the third lens is a convex spherical surface, the image surface of the third lens is a convex spherical surface, the object surface of the fourth lens is a concave spherical surface, and the image surface of the fourth lens is a convex spherical surface; Adjust the optical intervals between the first lens, the first cemented lens, the second cemented lens and the second lens to achieve a variety of different optical magnifications; The first optical interval is between 0.5 mm and 2.1 mm, and the third optical interval is between 6 mm and 25.7 mm; The parallel deviation angle between the principal optical axis and the incident ray on the object side and the emergent ray on the image side is between 40.7° and 40.9°; The optical magnification of the optical system is between 0.3 and 0.

8.

2. The optical system according to claim 1, characterized in that, The first lens is a biconvex lens, and the second lens is a convex-concave lens.

3. The optical system according to claim 2, characterized in that, The radius of curvature of the object surface of the first lens is between 15 and 16 mm; the radius of curvature of the image surface of the first lens is between 15 and 16 mm.

4. The optical system according to claim 2, characterized in that, The radius of curvature of the object surface of the second lens is between 13 and 14 mm; the radius of curvature of the image surface of the second lens is between 11 and 12 mm.

5. The optical system according to claim 1, characterized in that, The radius of curvature of the object surface of the first lens is between 10 and 11 mm, and the radius of curvature of the image surface of the first lens is between 4 and 5 mm; the object surface of the second lens is cemented to the image surface of the first lens, and the radius of curvature of the object surface of the second lens is the same as that of the image surface of the first lens, and the radius of curvature of the image surface of the second lens is between 11 and 12 mm.

6. The optical system according to claim 1, characterized in that, The radius of curvature of the object surface of the third lens is between 28 - 29 mm, and the radius of curvature of the image surface of the third lens is between 5 - 6 mm; the object surface of the fourth lens is cemented to the image surface of the third lens, the radius of curvature of the object surface of the fourth lens is the same as that of the third lens, and the radius of curvature of the image surface of the fourth lens is between 9 - 10 mm.

7. The optical system according to claim 1, characterized in that, It further includes a diaphragm, and the diaphragm is arranged between the first cemented lens and the second cemented lens.

8. An optical lens, characterized in that, Include, A housing; An optical system disposed within the housing, and the optical system consists of the following, A first lens; A first cemented lens disposed on the image side of the first lens, with a first optical interval between the first cemented lens and the first lens; A second cemented lens disposed on the image side of the first cemented lens, with a second optical interval between the first cemented lens and the second cemented lens; A second lens disposed on the image side of the second cemented lens, with a third optical interval between the second cemented lens and the second lens; Wherein, the first lens, the first cemented lens, the second cemented lens, and the second lens are arranged in sequence along the principal optical axis, and the first optical interval and the third optical interval are adjusted according to the optical magnification of the optical system, and the first optical interval is less than the third optical interval; The first lens and the second cemented lens have positive refractive power, and the first cemented lens and the second lens have negative refractive power; The object surface of the second lens is a convex spherical surface, the image surface of the second lens is a concave spherical surface, and the radius of curvature of the image surface of the second lens is less than the radius of curvature of the object surface of the second lens; The first cemented lens includes a first lens and a second lens, the object surface of the first lens is a concave spherical surface, the image surface of the first lens is a concave spherical surface, the object surface of the second lens is a convex spherical surface, and the image surface of the second lens is a concave spherical surface; The second cemented lens includes a third lens and a fourth lens, the object surface of the third lens is a convex spherical surface, the image surface of the third lens is a convex spherical surface, the object surface of the fourth lens is a concave spherical surface, and the image surface of the fourth lens is a convex spherical surface; Adjust the optical intervals between the first lens, the first cemented lens, the second cemented lens, and the second lens to achieve multiple different optical magnifications; The first optical interval is between 0.5 mm - 2.1 mm, and the third optical interval is between 6 mm - 25.7 mm; The parallel deviation angle between the principal optical axis and the incident ray on the object side and the emergent ray on the image side is between 40.7° - 40.9°; The optical magnification of the optical system is between 0.3 - 0.8; The optical system further includes a diaphragm, and the diaphragm is arranged between the first cemented lens and the second cemented lens.

Images