Visual system

Abstract

The invention provides a visual system. The visual system comprises a lens cone, a lens group and a spacing assembly, wherein the lens group and the spacing assembly are accommodated in the lens cone; the lens group sequentially comprises a first lens with negative focal power and a second lens with focal power along the optical axis direction; the lens group further comprises a quarter-wave plate and a reflective polarizing element. The quarter-wave plate is attached to the first side face of the first lens, and the reflective polarization element is attached to the first side face of the quarter-wave plate. Or, the reflective polarizing element is attached to the second side surface of the first lens, and the quarter-wave plate is attached to the second side surface of the reflective polarizing element; the spacing assembly comprises a lens barrel auxiliary spacing element arranged between the lens barrel and the first lens and a first spacing element arranged between the first lens and the second lens; the visual system meets the following conditions: L / (CT1 + CT2) is more than 5.05 and less than 6.95; and 4.90 < (EPb1 + CP1) / (EP0b + CP0b) < 9.80.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to a visual system. Background Technology

[0002] With the development of technology, visual systems are widely used in military reconnaissance, medical imaging, VR / AR, and consumer electronics. These scenarios require systems to have high resolution, compact design, and stable image quality. Maintaining optical performance under physical constraints has become a core challenge.

[0003] The current design faces two bottlenecks: First, the integration of polarization elements is insufficient. Quarter-wave plates and reflective polarizing elements are often assembled independently or simply attached to the lens surface. This layout is prone to optical path shift and aberration due to assembly gaps, while also increasing axial space occupation, which contradicts the requirement for compactness. Second, the design of the lens barrel and spacer parameters is crude. The size of the auxiliary spacer element of the lens barrel and the first spacer element between lenses directly affects the volume and positioning stability, but the existing solutions lack clear parameter guidance, making it difficult to balance compactness and imaging quality. Summary of the Invention

[0004] This application provides a visual system, including a lens barrel and a lens assembly and a spacer assembly housed within the lens barrel; the lens assembly includes, arranged sequentially along the optical axis from a first side to a second side: a first lens with negative optical power, having a first concave side and a second convex side; and a second lens with optical power, having a first concave side and a second convex side; the lens assembly further includes a quarter-wave plate and a reflective polarizing element; wherein the quarter-wave plate is attached to a first side of the first lens, and the reflective polarizing element is attached to a first side of the quarter-wave plate; or, the reflective polarizing element is attached to a second side of the first lens, and the quarter-wave plate is attached to a second side of the reflective polarizing element; the spacer assembly includes components positioned between the lens barrel and the first lens and connected to the lens assembly. The first side of the first lens contacts an auxiliary spacer element of the lens barrel and a first spacer element is placed between the first lens and the second lens; the visual system satisfies: 5.05 < L / (CT1+CT2) < 6.95; and 4.90 < (EPb1+CP1) / (EP0b+CP0b) < 9.80; where L is the maximum height of the lens barrel, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, EPb1 is the distance from the second side of the auxiliary spacer element to the first side of the first spacer element along the optical axis, CP1 is the maximum thickness of the first spacer element, EP0b is the distance from the first side of the lens barrel to the first side of the auxiliary spacer element along the optical axis, and CP0b is the maximum thickness of the auxiliary spacer element.

[0005] In some embodiments of this application, the visual system satisfies: 2.60≤(D0bm-d0bm) / (CT1+CTR+CTQ)≤4.18; where D0bm is the outer diameter of the second side of the auxiliary spacer element of the lens barrel, d0bm is the inner diameter of the second side of the auxiliary spacer element of the lens barrel, CT1 is the center thickness of the first lens, CTR is the center thickness of the reflective polarizing element, and CTQ is the center thickness of the quarter-wave plate.

[0006] In some embodiments of this application, the visual system satisfies: -1.35 < d0bs / R1 < -0.90, where d0bs is the inner diameter of the first side of the lens barrel auxiliary spacer element, and R1 is the radius of curvature of the first side of the first lens.

[0007] In some embodiments of this application, the visual system satisfies: -1.50 < d0m / R4 < -1.25; where d0m is the inner diameter of the second side of the lens barrel and R4 is the radius of curvature of the second side of the second lens.

[0008] In some embodiments of this application, the visual system satisfies: -2.95 < (d1s + D1s) / R2 < -1.90; where d1s is the inner diameter of the first side of the first spacer element, D1s is the outer diameter of the first side of the first spacer element, and R2 is the radius of curvature of the second side of the first lens.

[0009] In some embodiments of this application, the visual system satisfies: 4.45mm≤L×(f1 / f2)≤9.49mm; where L is the maximum height of the lens barrel, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0010] In some embodiments of this application, the visual system satisfies: 3.65 < D0m / TD < 4.55; where D0m is the outer diameter of the second side of the lens barrel, and TD is the axial distance from the first side of the first lens to the second side of the second lens.

[0011] In some embodiments of this application, the visual system satisfies: 1.18≤D0bs / f≤1.60; where D0bs is the outer diameter of the first side of the auxiliary spacer element of the lens barrel, and f is the effective focal length of the visual system.

[0012] In some embodiments of this application, the visual system satisfies: 9.60 < d0s / EPD < 10.30; where d0s is the inner diameter of the first side of the lens barrel, and EPD is the entrance pupil diameter of the visual system.

[0013] In some embodiments of this application, the visual system satisfies: 4.10 < D1m / T12 < 5.10; where D1m is the outer diameter of the second side of the first spacer element, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

[0014] In some embodiments of this application, the visual system satisfies: 4.15 < (D0s - d0s) / EP0b < 8.60; where D0s is the outer diameter of the first side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and EP0b is the distance from the first side of the lens barrel to the first side of the lens barrel auxiliary spacer element along the optical axis.

[0015] In some embodiments of this application, the visual system satisfies: 1.50mm < (D1m - d1m) × (R3 / R4) < 5.25mm; where D1m is the outer diameter of the second side of the first spacer element, d1m is the inner diameter of the second side of the first spacer element, R3 is the radius of curvature of the first side of the second lens, and R4 is the radius of curvature of the second side of the second lens.

[0016] In some embodiments of this application, the visual system satisfies: 1.15 < (D0m - d0s) / T12 < 1.60; Wherein, D0m is the outer diameter of the second side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

[0017] In summary, under the condition that 5.05 < L / (CT1+CT2) < 6.95, the total length of the two lenses and the lens barrel is limited. Under this condition, stress concentration will cause deformation of the spacer element, affecting the assembly stability. Therefore, by constraining 4.90 < (EPb1+CP1) / (EP0b+CP0b) < 9.80, this application can distribute the contact stress between the lens and the lens barrel, avoid deformation of the spacer element caused by local stress concentration, and reduce the radial and axial movement of the lens, thus balancing stress uniformity and assembly stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structural parameters of a visual system according to one embodiment of this application; Figure 2 This is a schematic diagram of the visual system according to Embodiment 1 of this application; Figure 3 This is a schematic diagram of the visual system according to Embodiment 2 of this application; Figure 4 This is a schematic diagram of the visual system according to Embodiment 3 of this application; Figure 5A A schematic diagram of the on-axis chromatic aberration curves of the visual system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown. Figure 5B A schematic diagram of the astigmatism curves of the visual system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown. Figure 5C A schematic diagram of the distortion curves of the visual system according to Embodiment 1, Embodiment 2 and Embodiment 3 of this application is shown; Figure 6 This is a schematic diagram of the visual system according to Embodiment 4 of this application; Figure 7 This is a schematic diagram of the visual system according to Embodiment 5 of this application; Figure 8 This is a schematic diagram of the visual system according to Embodiment Six of this application; Figure 9A A schematic diagram of the on-axis chromatic aberration curves of the visual system according to Embodiments 4, 5 and 6 of this application is shown. Figure 9B A schematic diagram of the astigmatism curves of the visual system according to Embodiments 4, 5 and 6 of this application is shown. Figure 9C A schematic diagram of the distortion curves of the visual system according to Embodiments 4, 5 and 6 of this application is shown. Figure 10 This is a schematic diagram of the visual system according to Embodiment Seven of this application; Figure 11 This is a schematic diagram of the visual system according to Embodiment 8 of this application; Figure 12 This is a schematic diagram of the visual system according to Embodiment Nine of this application; Figure 13A A schematic diagram of the on-axis chromatic aberration curves of the visual system according to Embodiments 7, 8, and 9 of this application is shown. Figure 13B A schematic diagram of the astigmatism curves of the visual system according to Embodiments 7, 8 and 9 of this application is shown. Figure 13C A schematic diagram of the distortion curves of the visual system according to Embodiments 7, 8 and 9 of this application is shown. Figure 14AThe stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=9.5; Figure 14B The stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=3.1; Figure 14C The stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=12.5. Detailed Implementation

[0019] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0020] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0021] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0022] In this paper, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface shape in the paraxial region can be determined based on the sign of the R value (R refers to the radius of curvature of the paraxial region). Taking the first side as an example, when the R value is positive, it is determined to be convex, and when the R value is negative, it is determined to be concave; taking the second side as an example, when the R value is positive, it is determined to be concave, and when the R value is negative, it is determined to be convex.

[0023] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0024] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formalized sense, unless expressly so specified herein.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other. The following embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be pointed out that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] like Figure 1 As shown, one embodiment of this application proposes a visual system including a lens barrel and a lens group and a spacer assembly housed within the lens barrel; the lens group includes, arranged sequentially along the optical axis from a first side to a second side: a first lens with negative optical power, having a first concave side and a second convex side; and a second lens with optical power, having a first concave side and a second convex side; the lens group further includes a quarter-wave plate and a reflective polarizing element; wherein, the quarter-wave plate is attached to a first side of the first lens, and the reflective polarizing element is attached to a first side of the quarter-wave plate; or, the reflective polarizing element is attached to a second side of the first lens, and the quarter-wave plate is attached to a second side of the reflective polarizing element; the spacer assembly includes a lens barrel auxiliary spacer element disposed between the lens barrel and the first lens and in contact with a first side of the first lens, and a first spacer element disposed between the first lens and the second lens.

[0027] Specifically, the visual system satisfies: 5.05 < L / (CT1+CT2) < 6.95; and 4.90 < (EPb1+CP1) / (EP0b+CP0b) < 9.80; Wherein, L is the maximum height of the lens barrel, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, EPb1 is the distance from the second side of the lens barrel auxiliary spacer to the first side of the first spacer along the optical axis, CP1 is the maximum thickness of the first spacer, EP0b is the distance from the first side of the lens barrel to the first side of the lens barrel auxiliary spacer along the optical axis, and CP0b is the maximum thickness of the lens barrel auxiliary spacer.

[0028] In this application, under the condition that 5.05 < L / (CT1+CT2) < 6.95, the total length of the two lenses and the lens barrel is limited. Under this condition, stress concentration will cause deformation of the spacer element, affecting the assembly stability. Therefore, this application can distribute the contact stress between the lens and the lens barrel by constraining 4.90 < (EPb1+CP1) / (EP0b+CP0b) < 9.80, avoiding deformation of the spacer element caused by local stress concentration, while reducing the radial and axial movement of the lens, thus balancing stress uniformity and assembly stability.

[0029] For example, Figure 14A The stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=9.5; Figure 14B The stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=3.1; Figure 14C The stress diagram of the visual system is shown when L / (CT1+CT2)=6.1 and (EPb1+CP1) / (EP0b+CP0b)=12.5; As can be seen from the figure, under the premise that L / (CT1+CT2)=6.1, the maximum stress of the visual system is 1.5339MPa when (EPb1+CP1) / (EP0b+CP0b)=9.5, 1.9865MPa when (EPb1+CP1) / (EP0b+CP0b)=3.1, and 1.9512MPa when (EPb1+CP1) / (EP0b+CP0b)=12.5. In other words, under the premise that 5.05<L / (CT1+CT2)<6.95, the maximum stress of the visual system is relatively small when 4.90<(EPb1+CP1) / (EP0b+CP0b)<9.80.

[0030] According to some embodiments of this application, the visual system satisfies: 2.60≤(D0bm-d0bm) / (CT1+CTR+CTQ)≤4.18; where D0bm is the outer diameter of the second side of the auxiliary spacer element of the lens barrel, d0bm is the inner diameter of the second side of the auxiliary spacer element of the lens barrel, CT1 is the center thickness of the first lens, CTR is the center thickness of the reflective polarizing element, and CTQ is the center thickness of the quarter-wave plate.

[0031] In this way, by reasonably controlling the range of this relationship, we can avoid the cramming or loosening of optical components due to improper size of the spacer element, ensure the stability of component positioning, optimize the support space of the spacer element for the optical component, reduce optical path deviation caused by structural adaptation problems, and help improve the imaging accuracy of the visual system.

[0032] According to some embodiments of this application, the visual system satisfies: -1.35 < d0bs / R1 < -0.90; where d0bs is the inner diameter of the first side of the lens barrel auxiliary spacer element, and R1 is the radius of curvature of the first side of the first lens.

[0033] By properly controlling the range of this relationship, the inner diameter of the auxiliary spacer element of the lens barrel can be matched with the curvature of the first side surface of the first lens, avoiding stress during lens assembly due to dimensional mismatch and ensuring the structural stability of the first lens. Simultaneously, it can optimize the fit between the auxiliary spacer element and the first lens, reducing interference from gaps or misalignments on the optical path, helping to reduce aberrations caused by assembly problems in the first lens, and improving the imaging clarity of the visual system.

[0034] According to some embodiments of this application, the visual system satisfies: -1.50 < d0m / R4 < -1.25; where d0m is the inner diameter of the second side of the lens barrel, and R4 is the radius of curvature of the second side of the second lens.

[0035] In this way, by reasonably controlling the range of this relationship, the positioning of the second lens can be avoided due to the size mismatch between the two, thereby ensuring the stability of the optical path propagation and helping to reduce imaging aberrations.

[0036] According to some embodiments of this application, the visual system satisfies: -2.95 < (d1s + D1s) / R2 < -1.90; where d1s is the inner diameter of the first side of the first spacer element, D1s is the outer diameter of the first side of the first spacer element, and R2 is the radius of curvature of the second side of the first lens.

[0037] In this way, by reasonably controlling the range of this relationship, we can avoid both the spacer element being too large and squeezing the lens, and the spacer element being too small and causing insufficient support, thus ensuring the compatibility between the first lens and the spacer element and reducing the deviation of the optical path caused by the misalignment of the elements.

[0038] According to some embodiments of this application, the visual system satisfies: 4.45mm≤L×(f1 / f2)≤9.49mm; where L is the maximum height of the lens barrel, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

[0039] In this way, by reasonably controlling the range of this relationship, we can avoid system volume redundancy or optical function limitation caused by the mismatch between the lens barrel height and the lens optical parameters, and optimize the optical path propagation path, thus helping to ensure the balance between the imaging stability of the visual system and the compact design requirements.

[0040] According to some embodiments of this application, the visual system satisfies: 3.65 < D0m / TD < 4.55; where D0m is the outer diameter of the second side of the lens barrel, and TD is the axial distance from the first side of the first lens to the second side of the second lens.

[0041] In this way, by reasonably controlling the range of this relationship, we can avoid both excessively large outer diameter of the lens barrel causing system volume redundancy and excessively small outer diameter causing insufficient support space for the lens group, thus helping to balance the compactness of the visual system and the assembly stability of the lens group.

[0042] According to some embodiments of this application, the visual system satisfies: 1.18≤D0bs / f≤1.60; where D0bs is the outer diameter of the first side of the auxiliary spacer element of the lens barrel, and f is the effective focal length of the visual system.

[0043] In this way, by reasonably controlling the range of this relationship, problems such as optical path obstruction and insufficient support caused by the mismatch between the outer diameter of the spacer element and the optical focal length of the system can be avoided, thus helping to ensure the integrity and stability of the system imaging.

[0044] According to some embodiments of this application, the visual system satisfies: 9.60 < d0s / EPD < 10.30; where d0s is the inner diameter of the first side of the lens barrel, and EPD is the entrance pupil diameter of the visual system.

[0045] In this way, by reasonably controlling the range of this relationship, we can avoid the inner diameter being too small and blocking the incident light path, thus affecting the amount of light entering the system. We can also prevent the inner diameter from being too large and causing stray light to intrude, thereby helping to ensure the light intake efficiency and imaging purity of the visual system.

[0046] According to some embodiments of this application, the visual system satisfies: 4.10 < D1m / T12 < 5.10; where D1m is the outer diameter of the second side of the first spacer element, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

[0047] In this way, by reasonably controlling the range of this relationship, we can avoid the assembly space being crowded or the support gap being too large due to the mismatch between the outer diameter of the spacer element and the lens spacing. This ensures the stable assembly of the lens group and reduces the deviation of the optical path caused by the misalignment of the elements.

[0048] According to some embodiments of this application, the visual system satisfies: 4.15 < (D0s - d0s) / EP0b < 8.60; where D0s is the outer diameter of the first side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and EP0b is the distance along the optical axis from the first side of the lens barrel to the first side of the lens barrel auxiliary spacer element.

[0049] In this way, by reasonably controlling the range of this relationship, we can avoid structural instability caused by imbalance between the difference and the spacing ratio, and also prevent redundant assembly space from affecting the system's compactness, thus helping to ensure the connection stability between the lens barrel and the auxiliary spacer elements.

[0050] According to some embodiments of this application, the visual system satisfies: 1.50mm < (D1m - d1m) × (R3 / R4) < 5.25mm; where D1m is the outer diameter of the second side of the first spacer element, d1m is the inner diameter of the second side of the first spacer element, R3 is the radius of curvature of the first side of the second lens, and R4 is the radius of curvature of the second side of the second lens.

[0051] In this way, by reasonably controlling the range of this relationship, we can avoid the misalignment of the spacer element supporting the second lens due to parameter adaptation deviation, and optimize the optical path space around the lens, thus helping to reduce imaging aberrations caused by structural adaptation problems of the second lens.

[0052] According to some embodiments of this application, the visual system satisfies: 1.15 < (D0m - d0s) / T12 < 1.60; where D0m is the outer diameter of the second side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

[0053] In this way, by reasonably controlling the range of this relationship, we can avoid the lens assembly space being too tight or too loose due to the imbalance of size ratio, and at the same time ensure the support of the lens barrel for the lens assembly, thus helping to reduce the imaging fluctuations caused by structural adaptation deviations in the optical path.

[0054] It should be noted that those skilled in the art should understand that the number of spacers constituting the visual system can be changed to obtain the various results and advantages described in this specification without departing from the technical solutions claimed in this application, and this application does not specifically limit this. For example, the visual system may also include other numbers of spacers than those described in the above embodiments, as needed.

[0055] Some specific, non-limiting embodiments of the above-described embodiments of this application will now be described in more detail with reference to the accompanying drawings. For ease of description, in the following embodiments, STO represents an aperture stop (not shown in the figures), E1 represents a first lens, E2 represents a second lens, RP represents a reflective polarizing element, QWP represents a quarter-wave plate, BS represents a partial reflective element, and IMG represents an image plane.

[0056] Example 1 like Figure 2 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a reflective polarizing element RP, a quarter-wave plate QWP, a first lens E1, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0057] In this embodiment, the first lens E1 has negative optical power, the first side of the first lens E1 is concave and the second side is convex; the second lens E2 has negative optical power, the first side of the second lens E2 is concave and the second side is convex.

[0058] In addition, Table 1 shows the basic optical parameters of the visual system of Embodiment 1, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0059] Table 1 In this embodiment, the first side surface and the second side surface of the first lens E1 and the second lens E2 are both aspherical, and the surface shape of each aspherical lens is... The following aspherical formulas can be used for limitation: (Formula 1); in, Let be the distance vector from the vertex of the aspherical surface along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, and A14 that can be used for each aspherical surface in Example 1.

[0060] Table 2 Example 2 like Figure 3 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a reflective polarizing element RP, a quarter-wave plate QWP, a first lens E1, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0061] It is worth noting that, compared with Embodiment 1 above, the visual system of Embodiment 2 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 2 is the same as Table 1, and the aspherical higher-order term coefficient table is the same as Table 2. However, the visual system of Embodiment 2 has different structural parameters from the visual system of Embodiment 1 above, that is, the difference between Embodiment 2 and Embodiment 1 is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 2 are shown in Table 8 below. It can be understood that the unit of each parameter value shown in Table 8 is millimeters (mm), and the schematic diagram of each parameter in the structural diagram of the visual system is shown below. Figure 1 As shown.

[0062] Example 3 like Figure 4 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a reflective polarizing element RP, a quarter-wave plate QWP, a first lens E1, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0063] It is worth noting that, compared with Embodiment 1 above, the visual system of Embodiment 3 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 3 is the same as Table 1, and the aspherical higher-order term coefficient table is the same as Table 2. However, the visual system of Embodiment 3 has different structural parameters than the visual system of Embodiment 1 above, that is, the difference between Embodiment 3 and Embodiment 1 is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 3 are shown in Table 8 below.

[0064] The on-axis chromatic aberration curves of the visual system in Examples 1, 2, and 3 are as follows: Figure 5A As shown; the astigmatic curves of the visual system in Examples 1, 2, and 3 are as follows. Figure 5B As shown; the distortion curves of the visual system in Embodiments 1, 2, and 3 are as follows. Figure 5C As shown. According to Figure 5A , Figure 5B as well as Figure 5C It can be seen that the visual systems in Embodiment 1, Embodiment 2 and Embodiment 3 can all achieve good imaging quality.

[0065] Example 4 like Figure 6 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0066] In this embodiment, the first lens E1 has negative optical power, and the first side surface of the first lens E1 is concave and the second side surface is convex; the second lens E2 has positive optical power, and the first side surface of the second lens E2 is concave and the second side surface is convex.

[0067] In addition, Table 3 shows the basic optical parameters of the visual system of Embodiment 4, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0068] Table 3 In this embodiment, the first side surface and the second side surface of the first lens E1 and the second lens E2 are both aspherical surfaces, and the surface shape of each aspherical lens can be defined by the aspherical formula (Formula 1) mentioned above. Table 4 below gives the higher-order coefficients A4, A6, A8, A10, A12, and A14 that can be used for each aspherical surface in Embodiment 4.

[0069] Table 4 Example 5 like Figure 7 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0070] It is worth noting that, compared with Embodiment 4 above, the visual system of Embodiment 5 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 5 is the same as Table 3, and the aspherical higher-order term coefficient table is the same as Table 4. However, the visual system of Embodiment 5 has different structural parameters than the visual system of Embodiment 4 above, that is, the difference between Embodiment 5 and Embodiment 4 is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 5 are shown in Table 8 below.

[0071] Example 6 like Figure 8 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0072] It is worth noting that, compared with Embodiment 4 above, the visual system of Embodiment 6 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 6 is the same as Table 3, and the aspherical higher-order term coefficient table is the same as Table 4. However, the visual system of Embodiment 6 has different structural parameters than the visual system of Embodiment 4 above, that is, the difference between Embodiment 6 and Embodiment 4 above is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 6 are shown in Table 8 below.

[0073] The on-axis chromatic aberration curves of the visual system in Examples 4, 5, and 6 are as follows: Figure 9A As shown; the astigmatic curves of the visual system in Examples 4, 5, and 6 are as follows. Figure 9B As shown; the distortion curves of the visual system in Examples 4, 5, and 6 are as follows. Figure 9C As shown. According to Figure 9A , Figure 9B as well as Figure 9C It can be seen that the visual systems in Embodiments 4, 5 and 6 can all achieve good imaging quality.

[0074] Example 7 like Figure 10 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0075] In this embodiment, the first lens E1 has negative optical power, and the first side surface of the first lens E1 is concave and the second side surface is convex; the second lens E2 has positive optical power, and the first side surface of the second lens E2 is concave and the second side surface is convex.

[0076] In addition, Table 5 shows the basic optical parameters of the visual system of Embodiment 7, where the units of radius of curvature and thickness / distance are millimeters (mm).

[0077] Table 5 In this embodiment, the first and second side surfaces of the first lens E1 and the second lens E2 are both aspherical, and the surface shape of each aspherical lens can be defined by the aspherical formula given in Embodiment 1 above. Table 6 below shows the higher-order coefficients A4, A6, A8, A10, A12, and A14 that can be used for each aspherical surface in Embodiment 7.

[0078] Table 6 Example 8 like Figure 11 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0079] It is worth noting that, compared with Embodiment 7 above, the visual system of Embodiment 8 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 8 is the same as Table 5, and the aspherical coefficient table is the same as Table 6. However, the visual system of Embodiment 8 has different structural parameters than the visual system of Embodiment 7 above, that is, the difference between Embodiment 8 and Embodiment 7 is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 8 are shown in Table 8 below.

[0080] Example 9 like Figure 12 As shown, in this embodiment, the visual system includes a lens barrel P0 and a lens group and a spacer assembly within the lens barrel P0; the lens group is arranged sequentially from the first side to the second side along the optical axis: a first lens E1, a reflective polarizing element RP, a quarter-wave plate QWP, a second lens E2, and a partially reflective element BS; the spacer assembly includes a lens barrel auxiliary spacer element P0b placed between the lens barrel P0 and the first lens E1 and in contact with the first side surface of the first lens E1, and a first spacer element P1 placed between the first lens E1 and the second lens E2.

[0081] It is worth noting that, compared with Embodiment 7 above, the visual system of Embodiment 9 has the same optical parameters, that is, the basic optical parameter table of the visual system of Embodiment 9 is the same as Table 5, and the aspherical higher-order term coefficient table is the same as Table 6. However, the visual system of Embodiment 9 has different structural parameters than the visual system of Embodiment 7 above, that is, the difference between Embodiment 9 and Embodiment 7 is that the dimensional values ​​of some structural parameters in the visual system are different. Specifically, the values ​​of each relevant structural parameter in Embodiment 9 are shown in Table 8 below.

[0082] The on-axis chromatic aberration curves of the visual system in Examples 7, 8, and 9 are as follows: Figure 13A As shown; the astigmatic curves of the visual system in Examples 7, 8, and 9 are as follows. Figure 13B As shown; the distortion curves of the visual system in Examples 7, 8, and 9 are as follows. Figure 13C As shown. According to Figure 13A , Figure 13B as well as Figure 13C It can be seen that the visual systems in Embodiments 7, 8 and 9 can all achieve good imaging quality.

[0083] In summary, the optical parameters of the visual system in Examples 1 to 9 are shown in Table 7 below.

[0084] Table 7 Furthermore, the structural parameters of the visual systems in Examples 1 to 9 are shown in Table 8. All structural parameters in the table below are in millimeters (mm).

[0085] Table 8 In summary, the visual systems in Examples 1 to 9 satisfy the relationships shown in Table 9, as detailed in Table 9.

[0086] Table 9 The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vision system characterized by: The visual system comprises a lens barrel, a lens group and a spacer assembly accommodated in the lens barrel; The lens group comprises, in order from a first side to a second side along an optical axis direction, a first lens with negative optical power, whose first side is concave and whose second side is convex, and a second lens with optical power, whose first side is concave and whose second side is convex; the lens group further comprises a quarter-wave plate and a reflective polarizing element; the quarter-wave plate is attached to the first side of the first lens, and the reflective polarizing element is attached to the first side of the quarter-wave plate; or the reflective polarizing element is attached to the second side of the first lens, and the quarter-wave plate is attached to the second side of the reflective polarizing element; The spacer assembly comprises a lens barrel auxiliary spacer element arranged between the lens barrel and the first lens and in contact with the first side of the first lens, and a first spacer element arranged between the first lens and the second lens; the visual system satisfies 5.05 < L / (CT1+CT2) < 6.95 and 4.90 < (EPb1+CP1) / (EP0b+CP0b) < 9.80; wherein L is the maximum height of the lens barrel, CT1 is the center thickness of the first lens, CT2 is the center thickness of the second lens, EPb1 is the distance along the optical axis direction from the second side of the lens barrel auxiliary spacer element to the first side of the first spacer element, CP1 is the maximum thickness of the first spacer element, EP0b is the distance along the optical axis direction from the first side of the lens barrel to the first side of the lens barrel auxiliary spacer element, and CP0b is the maximum thickness of the lens barrel auxiliary spacer element.

2. The vision system of claim 1, wherein, The visual system satisfies 2.60 ≤ (D0bm-d0bm) / (CT1+CTR+CTQ) ≤ 4.18; wherein D0bm is the outer diameter of the second side of the lens barrel auxiliary spacer element, d0bm is the inner diameter of the second side of the lens barrel auxiliary spacer element, CT1 is the center thickness of the first lens, CTR is the center thickness of the reflective polarizing element, and CTQ is the center thickness of the quarter-wave plate.

3. The vision system of claim 1, wherein, The visual system satisfies -1.35 < d0bs / R1 < -0.90; wherein d0bs is the inner diameter of the first side of the lens barrel auxiliary spacer element, and R1 is the radius of curvature of the first side of the first lens.

4. The vision system of claim 1, wherein, The visual system satisfies -1.50 < d0m / R4 < -1.25; wherein d0m is the inner diameter of the second side of the lens barrel, and R4 is the radius of curvature of the second side of the second lens.

5. The vision system of claim 1, wherein, The visual system satisfies -2.95 < (d1s+D1s) / R2 < -1.90; wherein d1s is the inner diameter of the first side of the first spacer element, D1s is the outer diameter of the first side of the first spacer element, and R2 is the radius of curvature of the second side of the first lens.

6. The vision system of claim 1, wherein, The visual system satisfies 4.45 mm ≤ L×(f1 / f2) ≤ 9.49 mm; Wherein, L is the maximum height of the lens barrel, f1 is the effective focal length of the first lens, and f2 is the effective focal length of the second lens.

7. The vision system of claim 1, wherein, The visual system satisfies: 3.65 < D0m / TD < 4.55; Wherein, D0m is the outer diameter of the second side of the lens barrel, and TD is the axial distance from the first side of the first lens to the second side of the second lens.

8. The vision system of claim 1, wherein, The visual system satisfies: 1.18 ≤ D0bs / f ≤ 1.60; Wherein, D0bs is the outer diameter of the first side of the auxiliary spacer element of the lens barrel, and f is the effective focal length of the visual system.

9. The vision system of claim 1, wherein, The visual system satisfies: 9.60 < d0s / EPD < 10.30; Wherein, d0s is the inner diameter of the first side of the lens barrel, and EPD is the entrance pupil diameter of the visual system.

10. The vision system of claim 1, wherein, The visual system satisfies: 4.10 < D1m / T12 < 5.10; Wherein, D1m is the outer diameter of the second side of the first spacer element, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

11. The vision system of claim 1, wherein, The visual system satisfies: 4.15 < (D0s-d0s) / EP0b < 8.60; Wherein, D0s is the outer diameter of the first side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and EP0b is the distance along the optical axis from the first side of the lens barrel to the first side of the auxiliary spacer element of the lens barrel.

12. The vision system of claim 1, wherein, The visual system satisfies: 1.50 mm < (D1m-d1m) x (R3 / R4) < 5.25 mm; Wherein, D1m is the outer diameter of the second side of the first spacer element, d1m is the inner diameter of the second side of the first spacer element, R3 is the radius of curvature of the first side of the second lens, and R4 is the radius of curvature of the second side of the second lens.

13. The vision system of claim 1, wherein, The visual system satisfies: 1.15 < (D0m-d0s) / T12 < 1.60; Wherein, D0m is the outer diameter of the second side of the lens barrel, d0s is the inner diameter of the first side of the lens barrel, and T12 is the axial distance from the second side of the first lens to the first side of the second lens.

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