Imaging lens module and optical display device

Abstract

An embodiment of the present application provides an imaging lens module and an optical display device; wherein, the imaging lens module includes an image sensor, a fourth lens group, a third lens group, an aperture, a second lens group and a first lens group in sequence from the image side to the object side; the first lens group includes a sixth lens having a negative optical focal length, which is used to deflect off-axis light incident with a large field of view toward the optical axis; the second lens group includes a fifth lens and a fourth lens, which are used to correct off-axis aberrations caused by light incident with a large field of view; the third lens group includes a third lens, which is used to maintain the focal length of the imaging lens module stable under different temperature conditions; the fourth lens group includes a second lens and a first lens; the optical focal length φ1' of the first lens group, the optical focal length φ2' of the second lens group, the optical focal length φ3' of the third lens group and the optical focal length φ4' of the fourth lens group satisfy 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.5.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of projection optical display technology. More specifically, the embodiments of the present application relate to an imaging lens module and an optical display device. Background Art

[0002] With the continuous advancement of optical technology, lens modules are increasingly used in various optical display devices. However, traditional lens modules often struggle to meet both performance and cost requirements when faced with the challenges of large field of view, high resolution, and stability under varying ambient temperatures. In particular, variations in the focal length of lens modules under varying temperatures can significantly degrade image quality. Therefore, how to reduce costs while maintaining performance and improve the stability of lens modules under varying ambient temperatures has become a pressing issue in the field of optical imaging technology. Summary of the Invention

[0003] The purpose of this application is to provide a new technical solution for an imaging lens module and an optical display device.

[0004] In a first aspect, an embodiment of the present application provides an imaging lens module, which includes, from the image side to the object side, an image sensor, a fourth lens group, a third lens group, an aperture, a second lens group, and a first lens group;

[0005] The first lens group includes a sixth lens having negative optical power, which is used to deflect off-axis light incident from a large field of view toward the optical axis to narrow the light beam;

[0006] The second lens group includes a fifth lens and a fourth lens for correcting off-axis aberrations caused by incident light with a large field of view;

[0007] The third lens group includes a third lens, the thermal expansion coefficient of which is less than 10×10 -6 / ℃, used to keep the focal length of the imaging lens module stable under different temperature conditions, thereby eliminating defocusing;

[0008] The fourth lens group includes a second lens and a first lens, and is used to correct aperture aberration and balance high-order aberrations introduced by the second lens group;

[0009] The optical power φ1' of the first lens group, the optical power φ2' of the second lens group, the optical power φ3' of the third lens group and the optical power φ4' of the fourth lens group satisfy the following relationship: 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.5.

[0010] Optionally, the sixth lens includes an eleventh surface close to the image sensor and a twelfth surface away from the image sensor, and both the eleventh surface and the twelfth surface are bent toward the image sensor;

[0011] A ratio of the effective optical aperture D1 of the eleventh surface to the effective optical aperture D2 of the twelfth surface satisfies: D1 / D2≤0.5.

[0012] Optionally, the second lens group satisfies: |φ5+φ4|≤0.3; wherein φ5 is the optical power of the fifth lens, and φ4 is the optical power of the fourth lens.

[0013] Optionally, the fourth lens group satisfies: |φ2+φ1|≤0.15; wherein φ2 is the optical focal length of the second lens, and φ1 is the optical focal length of the first lens.

[0014] Optionally, the aperture is located between the fourth lens and the third lens;

[0015] The distance between the aperture and the fourth lens along the optical axis is L1, and the distance between the aperture and the third lens along the optical axis is L2, then 0.1 mm ≤ L1, L2 ≤ 1 mm.

[0016] Optionally, lenses in the first lens group, the second lens group and the fourth lens group are made of plastic.

[0017] Optionally, the fifth lens includes a ninth surface close to the image sensor and a tenth surface away from the image sensor;

[0018] The ratio of the outer diameter T1 of the eleventh surface of the sixth lens to the outer diameter T2 of the tenth surface of the fifth lens satisfies: 1<T1 / T2<1.3.

[0019] Optionally, the outer diameter T3 of the fifth lens and the outer diameter T4 of the fourth lens satisfy the following relationship: 1.2 mm ≤ T3 - T4 ≤ 3.6 mm.

[0020] Optionally, the optical power φ1′ of the first lens group and the optical power φ2′ of the second lens group are both negative, the optical power φ3′ of the third lens group is positive, and the relationship (φ1′+φ2′+φ3′)>0 is satisfied.

[0021] Optionally, the imaging lens module further includes a protective glass located between the image sensor and the first lens, and the protective glass includes two adjacent and spaced glass plates.

[0022] In a second aspect, an embodiment of the present application provides an optical display device, comprising:

[0023] casing; and

[0024] The imaging lens module as described in the second aspect.

[0025] The beneficial effects of this application are:

[0026] The imaging lens module provided in the embodiment of the present application effectively deflects off-axis light incident from a large field of view toward the optical axis through the negative focal length design of the sixth lens (object side) in the first lens group, narrows the light beam, significantly improves the performance of the edge field of view, reduces light loss, and thus improves the overall imaging efficiency; the second lens group is mainly composed of the fifth lens and the fourth lens, and is mainly used to correct off-axis aberrations caused by incident light from a large field of view, ensuring clear images in each field of view and improving imaging quality; the third lens group uses a third lens made of a low thermal expansion coefficient material, which can maintain the focal length of the imaging lens module stable under different temperature environments, effectively eliminate the defocus phenomenon caused by temperature changes, and ensure that the imaging lens module can be used in various ambient temperatures. The fourth lens group, mainly composed of the second and first lens elements working together, not only corrects aperture aberrations but also balances the higher-order aberrations introduced by the second lens group, further improving overall image quality and ensuring high image clarity and low distortion. Crucially, the fourth lens group, by adhering to the optical power ratio constraint of 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.5, can offset the accumulated spherical aberration and higher-order aberrations of the first three lens groups, while compensating for image plane shift caused by temperature changes. This allows the imaging lens module to still meet the optical indicators of vertical axis chromatic aberration less than 24μm and distortion less than 90% over a wide temperature range, achieving a perfect combination of high performance and wide temperature adaptability.

[0027] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0029] Figure 1 This is one of the optical architecture diagrams of the imaging lens module provided in an embodiment of the present application;

[0030] Figure 2 for Figure 1 Dot array diagram of the provided imaging lens module;

[0031] Figure 3 for Figure 1 Provided MTF graph of the imaging lens module;

[0032] Figure 4 for Figure 1Provide field curvature and distortion diagrams of the imaging lens module;

[0033] Figure 5 for Figure 1 Provide vertical axis chromatic aberration diagram of the imaging lens module;

[0034] Figure 6 The second optical architecture diagram of the imaging lens module provided in an embodiment of the present application;

[0035] Figure 7 for Figure 6 Dot array diagram of the provided imaging lens module;

[0036] Figure 8 for Figure 6 Provided MTF graph of the imaging lens module;

[0037] Figure 9 for Figure 6 Provide field curvature and distortion diagrams of the imaging lens module;

[0038] Figure 10 for Figure 6 The vertical axis chromatic aberration diagram of the provided imaging lens module.

[0039] Description of reference numerals:

[0040] 1. Image sensor; 2. Protective glass; 3. First lens; 31. First surface; 32. Second surface; 4. Second lens; 41. Third surface; 42. Fourth surface; 5. Third lens; 51. Fifth surface; 52. Sixth surface; 6. Fourth lens; 61. Seventh surface; 62. Eighth surface; 7. Fifth lens; 71. Ninth surface; 72. Tenth surface; 8. Sixth lens; 81. Eleventh surface; 82. Twelfth surface; 9. Aperture. DETAILED DESCRIPTION

[0041] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0042] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0043] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0044] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0045] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0046] The imaging lens module and the optical display device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0047] According to one embodiment of the present application, an imaging lens module is provided. Figure 1 and Figure 6 The imaging lens module includes, from the image side to the object side, an image sensor 1, a fourth lens group, a third lens group, an aperture 9, a second lens group, and a first lens group. The first lens group includes a sixth lens 8, which has a negative optical power and can be used to deflect off-axis light incident on a large field of view toward the optical axis to narrow the light beam. The second lens group includes a fifth lens 7 and a fourth lens 6, which are used to correct off-axis aberrations caused by incident light on a large field of view. The third lens group includes a third lens 5, and the thermal expansion coefficient of the material of the third lens 5 is ≤10×10 -6 / °C, used to maintain the focal length of the imaging lens module stable under different temperature conditions, thereby eliminating defocus. The fourth lens group includes a second lens 4 and a first lens 3, which can be used to correct aperture aberrations and balance the high-order aberrations introduced by the second lens group. The optical power φ1' of the first lens group, the optical power φ2' of the second lens group, the optical power φ3' of the third lens group, and the optical power φ4' of the fourth lens group satisfy the following relationship: 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.5.

[0048] This embodiment of the present application describes the design of an imaging lens module. This imaging lens module includes, in order from the image side to the object side along the same optical axis, an image sensor 1, a fourth lens group, a third lens group, an aperture 9, a second lens group, and a first lens group. The following is a detailed analysis of each component.

[0049] In the imaging lens module design of the embodiment of the present application, the first lens group includes at least one sixth lens 8 located on the object side, see Figure 1 It is worth noting that the sixth lens 8 has the largest aperture in the entire imaging lens module. This design feature lays the foundation for subsequent optical performance optimization.

[0050] Specifically, the sixth lens element 8 has negative optical power. This design utilizes the optical properties of negative optical power lenses to effectively deflect off-axis light from a wide field of view toward the optical axis. This process effectively narrows the light that would otherwise be lost due to excessive viewing angles, significantly improving the performance of the imaging lens module at the edges of the field of view.

[0051] Furthermore, the effect of narrowing the beam isn't limited to improving peripheral field of view performance; it also offers another important advantage: reduced light loss. In optical systems, light loss often leads to a decrease in imaging efficiency, but the design of the sixth lens element 8 effectively mitigates this trend. By reducing light loss, the imaging lens module of the present embodiment can more efficiently utilize incident light, thereby improving overall imaging efficiency and providing users with a clearer, brighter image experience.

[0052] In the imaging lens module design of the embodiment of the present application, the second lens group is composed of at least the fifth lens 7 and the fourth lens 6. The main function of the second lens group is to correct off-axis aberrations caused by incident light with a large field of view. This design is crucial to improving overall imaging quality.

[0053] Specifically, when light is incident at a wide viewing angle, off-axis aberrations often occur during the imaging process, resulting in blurred or distorted image edges. The second lens assembly in this application effectively corrects these off-axis aberrations through a carefully designed lens combination, particularly the synergistic effect of the fifth lens 7 and the fourth lens 6. After correction, the imaging lens module provided in this application can produce clear images across different fields of view, significantly improving imaging quality.

[0054] Furthermore, to further optimize imaging performance, this application proposes an optional solution: adding additional lenses on either side of the fourth lens 6. This additional lens allows for more precise optical path control, further enhancing image clarity. This design enables the imaging lens module to adapt to a wider range of application scenarios and meet higher imaging requirements.

[0055] In the imaging lens module design of the embodiment of the present application, the third lens group includes at least one key component, the third lens 5. The significant feature of the third lens 5 is that its material has a low thermal expansion coefficient (≤10×10 -6 / ℃), this feature is crucial to ensure the performance stability of the imaging lens module under different temperature conditions.

[0056] Specifically, the primary function of the third lens group is to effectively maintain the focal length of the imaging lens module within a wide range of ambient temperature variations. By utilizing materials with a low coefficient of thermal expansion, the third lens element 5 significantly reduces dimensional changes caused by temperature fluctuations, thereby preventing defocus during imaging. This design ensures consistent performance of the imaging lens module across a wide range of ambient temperatures, avoiding degradation of image quality due to temperature fluctuations.

[0057] In the imaging lens module design of the embodiment of the present application, the fourth lens group includes a second lens 4 and a first lens 3. The fourth lens group has a dual function: one is to correct aperture aberration, and the other is to balance the high-order aberrations introduced by the second lens group.

[0058] Specifically, aperture aberration usually originates from the imaging difference generated when light passes through different aperture areas. The fourth lens group can effectively correct this aberration through its specific optical design, ensuring that light can be accurately focused on the image sensor 1 after passing through the imaging lens module.

[0059] At the same time, the second lens group may introduce certain higher-order aberrations during the process of correcting off-axis aberrations. If these aberrations are not balanced, they will affect image quality. The fourth lens group in this application balances these higher-order aberrations through its carefully designed lens combination, resulting in an overall superior image quality for the imaging lens module.

[0060] By achieving the above-mentioned dual functions, the fourth lens group significantly improves the overall image quality of the entire imaging lens module, ensuring the high clarity and low distortion characteristics of the final image, and bringing users a higher-quality and more realistic visual experience.

[0061] The imaging lens module design of this embodiment also incorporates a power ratio constraint: 0.5 ≤ |(φ1'+φ2'+φ3') / φ4'| ≤ 3.5. This ratio constrains the power distribution relationship between the first, second, third, and fourth lens groups. The following is a detailed analysis of the effect of this power ratio.

[0062] Spherical aberration, a common aberration in optical systems, causes light rays passing through a lens to not focus on a single point, but instead form a circle of confusion, thereby reducing image clarity. In this application, by rationally allocating the focal powers of the first, second, and third lens groups (with focal powers of φ1', φ2', and φ3', respectively) and the fourth lens group (with focal power of φ4'), and by satisfying the aforementioned ratio constraints, the spherical aberrations generated by each lens group can be offset.

[0063] In addition to spherical aberration, optical systems also contain higher-order aberrations such as coma and astigmatism, which also affect image quality. The power ratio constraint in this application helps balance these higher-order aberrations by optimizing the power distribution of each lens group, further improving image clarity and accuracy.

[0064] The complementarity of power distribution is designed in this application, specifically:

[0065] (1) Influence of φ1', φ2' and φ3': When the temperature changes, the optical power (φ1', φ2', φ3') of the first lens group, the second lens group and the third lens group may cause the focal length or image plane position to change due to factors such as thermal expansion of the material, thereby causing a decrease in image quality, that is, the image quality defocus phenomenon.

[0066] (2) Compensation mechanism of φ4': Unlike the first lens group, the optical power φ4' of the fourth lens group exhibits the opposite focus shift trend when the temperature changes. That is, if the first three lens groups cause the image plane to shift to the left due to temperature changes, the fourth lens group will shift the image plane to the right, thereby playing a compensating role. This complementary design enables the fourth lens group to effectively compensate for the aberrations introduced by the first three lens groups due to temperature changes, ensuring stable imaging quality.

[0067] In this application, the third lens group is specifically designed as a temperature-compensating group. Its lens (third lens element 5) is made of a material with a low coefficient of thermal expansion, which helps maintain focal length stability under varying temperature conditions. However, even with this temperature compensation mechanism, aberrations may still vary. The complementary power distribution of the fourth lens group plays a key role in this, further correcting these aberrations and ensuring consistent image quality.

[0068] The complementary relationship between φ1', φ2', φ3', and φ4' significantly improves the stability of the entire imaging lens module under varying temperature conditions. This design not only reduces fluctuations in image quality caused by temperature changes, but also improves the reliability and durability of the imaging lens module.

[0069] When the optical power ratio |(φ1'+φ2'+φ3') / φ4'| is not within the range of 0.5 to 3.5, it will bring the following disadvantages to the imaging lens module:

[0070] (1) Insufficient or excessive aberration correction:

[0071] If the optical power ratio deviates from the range of 0.5 to 3.5, the various lens groups will not work together effectively to correct spherical aberration. For example, a ratio that is too small may result in insufficient correction of spherical aberration, resulting in blurred images; while a ratio that is too large may introduce new aberrations, also affecting image quality.

[0072] In addition to spherical aberration, higher-order aberrations such as coma and astigmatism may not be effectively balanced due to improper distribution of optical power, resulting in distorted or deformed images.

[0073] (2) Decreased temperature stability:

[0074] When the temperature fluctuates, if the power ratio is outside the range of 0.5 to 3.5, the complementarity between the first, second, and third lens groups (φ1', φ2', φ3'), and the fourth lens group (φ4') will weaken. This may lead to increased image defocus and fluctuations in image quality with temperature changes.

[0075] (3) Decreased imaging quality:

[0076] Due to insufficient or excessive aberration correction and reduced temperature stability, imaging clarity will be seriously affected. The image may become blurred and fail to meet the requirements of high-resolution imaging.

[0077] Improper power distribution can also lead to increased distortion and vertical chromatic aberration. Distortion causes straight lines in the image to appear curved, while chromatic aberration causes the image to appear off-color, further degrading image quality.

[0078] It should be noted that the power ratio constraint of 0.5 ≤ |(φ1'+φ2'+φ3') / φ4'| ≤ 3.5 plays a crucial role in the design of the imaging lens module in the embodiment of this application. It not only offsets spherical aberration and higher-order aberrations and compensates for image plane shift caused by temperature changes, but also enables the imaging lens module to meet stringent optical specifications over a wide temperature range, thereby significantly improving overall imaging performance.

[0079] The imaging lens module provided in the embodiment of the present application effectively deflects the off-axis light incident from a large field of view toward the optical axis through the negative optical focal length design of the sixth lens 8 (object side) in the first lens group, narrows the light beam, significantly improves the peripheral field of view performance, reduces light loss, and thus improves the overall imaging efficiency; the second lens group is mainly composed of the fifth lens 7 and the fourth lens 6, which are mainly used to correct the off-axis aberration caused by the incident light from a large field of view, ensure clear images in each field of view, and improve imaging quality; the third lens group uses the third lens 5 made of a low thermal expansion coefficient material, which can maintain the focal length of the imaging lens module stable under different temperature environments, effectively eliminate the defocus phenomenon caused by temperature changes, and ensure that the imaging lens module can be used in various environments Performance consistency under temperature; the fourth lens group is mainly composed of the second lens 4 and the first lens 3 working together, which not only corrects aperture aberration, but also balances the high-order aberrations introduced by the second lens group, further improving the overall image quality and ensuring high image clarity and low distortion; particularly, the fourth lens group can offset the accumulated spherical aberration and high-order aberrations of the first three lens groups by following the optical focal length ratio constraint of 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.5, while compensating for the image plane shift caused by temperature changes, so that the imaging lens module can still meet the optical indicators of vertical axis chromatic aberration less than 24μm and distortion less than 90% within a wide temperature range, achieving a perfect combination of high performance and wide temperature adaptability.

[0080] In some examples of this application, see Figure 1 and Figure 6 The sixth lens 8 includes an eleventh surface 81 close to the image sensor 1 and a twelfth surface 82 away from the image sensor 1, and the eleventh surface 81 and the twelfth surface 82 are both bent toward the image sensor 1; the ratio of the effective optical aperture D1 of the eleventh surface 81 to the effective optical aperture D2 of the twelfth surface 82 satisfies: D1 / D2≤0.5.

[0081] See also Figure 1 and Figure 6 The sixth lens element 8 includes an eleventh surface 81 (i.e., image-side surface) close to the image sensor 1 and a twelfth surface 82 (i.e., object-side surface) away from the image sensor 1 . The key design features are:

[0082] (1) Double surface curved design:

[0083] The sixth lens element 8 comprises an eleventh surface 81 (i.e., image-side surface) located proximal to the image sensor 1 and a twelfth surface 82 (i.e., object-side surface) located distal to the image sensor 1. Both surfaces are curved toward the image sensor 1. This design enables the sixth lens element 8 to exhibit superior light collection performance, particularly effectively narrowing off-axis light with a large field of view (up to 170°), significantly improving light collection efficiency and providing more abundant light resources for the imaging lens module.

[0084] (2) Optimization of effective optical aperture ratio:

[0085] Furthermore, the effective optical aperture D1 of the eleventh surface 81 of the sixth lens element 8 and the effective optical aperture D2 of the twelfth surface 82 are designed to satisfy D1 / D2 ≤ 0.5. This effective optical aperture ratio limit is not set arbitrarily. It ensures that the sixth lens element 8 can fully play its light-collecting role in the imaging lens module. By balancing the optical performance on both sides of the lens, the generation of various aberrations (such as spherical aberration, coma, etc.) is effectively reduced, thereby significantly improving the imaging quality.

[0086] In summary, the dual-surface curvature of the sixth lens element 8, combined with the optimized effective optical aperture ratio, constitutes a major highlight of the imaging lens module of this application. They not only improve light collection efficiency but also optimize the lens' optical performance, reduce aberrations, and lay the foundation for improved imaging quality.

[0087] In some examples of the present application, the second lens group satisfies: |φ5+φ4|≤0.3; wherein φ5 is the optical power of the fifth lens 7, and φ4 is the optical power of the fourth lens 6.

[0088] In the example provided in this application, constraint control is implemented for the optical power distribution of the second lens group (which is mainly composed of the fifth lens 7 and the fourth lens 6), specifically satisfying the condition |φ5+φ4|≤0.3. Here, φ5 refers to the optical power of the fifth lens 7, and φ4 refers to the optical power of the fourth lens 6. Figure 1 and Figure 6 From the display, it can be clearly seen that the fifth lens 7 is designed to have a negative optical power, while the fourth lens 6 is designed to have a positive optical power.

[0089] In this application, the second lens group achieves significant correction of off-axis aberrations over a wide field of view by carefully controlling the combined optical power of the fifth lens element 7 and the fourth lens element 6. Off-axis aberrations are a common problem in optical systems and are particularly pronounced when imaging over a wide field of view. By strictly meeting the condition |φ5+φ4|≤0.3, the second lens group can more efficiently focus off-axis light onto the image sensor 1, significantly reducing the negative impact of aberrations on image quality.

[0090] There's a direct and close connection between correcting off-axis aberrations and image clarity. By continuously optimizing the power distribution of the second lens group, this application achieves a significant improvement in image clarity, rendering image detail richer and more precise. This improvement is crucial for applications requiring stringent high-resolution imaging.

[0091] In some examples of the present application, the fourth lens group satisfies: |φ2+φ1|≤0.15; wherein φ2 is the optical power of the second lens 4 , and φ1 is the optical power of the first lens 3 .

[0092] In the example provided herein, refined constraint control is implemented for the power distribution of the fourth lens group (which primarily consists of the second lens 4 and the first lens 3), specifically satisfying the condition |φ2+φ1|≤0.15. Here, φ2 refers to the power of the second lens 4, and φ1 refers to the power of the first lens 3.

[0093] The fourth lens group efficiently corrects aperture aberration by regulating the combined optical power of the second lens element 4 and the first lens element 3. Aperture aberration is a key factor affecting the image clarity of an imaging lens module, and is particularly prominent in high-resolution imaging scenarios. By satisfying the condition |φ2+φ1|≤0.15, the fourth lens group can more accurately balance and correct aperture-induced aberrations, significantly improving image accuracy and clarity.

[0094] In addition to correcting aperture aberrations, the design of the fourth lens group also fully considers the balance of higher-order aberrations. By properly allocating the optical power of the second lens element 4 and the first lens element 3, the fourth lens group can effectively balance higher-order aberrations while correcting aperture aberrations, thereby reducing image artifacts and distortion, further improving overall image quality.

[0095] Effective correction of aperture aberrations and higher-order aberrations significantly improves image quality. By optimizing the power distribution of the fourth lens group, this application enhances image clarity, contrast, and color reproduction, rendering image details richer and more accurate. This improvement is extremely important for applications requiring high resolution and high image quality.

[0096] In some examples of this application, see Figure 1 and Figure 2 , the aperture 9 is located between the fourth lens 6 and the third lens 5; the distance between the aperture 9 and the fourth lens 6 along the optical axis is L1, and the distance between the aperture 9 and the third lens 5 along the optical axis is L2, then 0.1mm≤L1, L2≤1mm.

[0097] The example provided herein describes the position of aperture 9 in the imaging lens module and its distance relationship to adjacent lenses (i.e., fourth lens 6 and third lens 5). Specifically, aperture 9 is positioned between fourth lens 6 and third lens 5, and the distance along the optical axis between aperture 9 and fourth lens 6 is L1, and the distance along the optical axis between aperture 9 and third lens 5 is L2, both of which satisfy the conditions of 0.1 mm ≤ L1 and L2 ≤ 1 mm.

[0098] As a core element for controlling the amount of light passing through, the position of aperture 9 plays a crucial role in optimizing the optical path design. By placing aperture 9 between the fourth lens 6 and the third lens 5 and controlling the distance range between L1 and L2, the present invention can more precisely control the light propagation path, effectively reducing unnecessary scattering and stray light, thereby significantly improving image clarity and contrast.

[0099] Furthermore, limiting the distance between L1 and L2 to between 0.1mm and 1mm not only ensures stable optical performance but also helps minimize the overall size of the imaging lens module while maintaining performance. This compact and efficient design not only facilitates product integration and installation, but also enhances its overall portability and market competitiveness.

[0100] More importantly, controlling the distance between the aperture 9 and adjacent lenses significantly enhances the stability of the entire imaging lens module. This distance control effectively minimizes module performance variations in the face of environmental factors such as temperature fluctuations, ensuring stable and reliable imaging quality and providing users with an exceptional visual experience.

[0101] In some examples of the present application, lenses in the first lens group, the second lens group, and the fourth lens group are made of plastic.

[0102] The imaging lens module provided in the embodiments of this application has been optimized in its lens material selection. Specifically, with the exception of the third lens group, which uses a different material due to special design requirements, the remaining lens groups, including the first, second, and fourth lens groups, all use cost-effective plastic lenses. This design decision brings many technical benefits and advantages:

[0103] (1) Significantly improved cost-effectiveness: Plastic lenses have significant advantages over traditional glass lenses in terms of both raw material costs and processing costs. By adopting plastic lenses on a large scale, this application reduces the overall manufacturing cost of imaging lens modules.

[0104] (2) Weight reduction and enhanced portability: The low density of plastic materials significantly reduces the overall weight of imaging lens modules using plastic lenses. This advantage not only improves the portability of the product but also reduces transportation and installation costs.

[0105] (3) Excellent processing performance: Plastic materials have good plasticity and processing performance, and can quickly and accurately produce lenses with complex shapes through advanced processes such as injection molding.

[0106] In summary, by using plastic lenses as the primary components of the imaging lens module (excluding the third lens group), the present embodiment achieves improved cost-effectiveness, reduced weight, and optimized processing performance. These technical benefits not only enhance the product's market competitiveness but also provide users with a more lightweight, efficient, and economical imaging solution.

[0107] In some examples of this application, see Figure 1 and Figure 6 The fifth lens 7 includes a ninth surface 71 close to the image sensor 1 and a tenth surface 72 away from the image sensor 1; the ratio between the outer diameter T1 of the eleventh surface 81 of the sixth lens 8 and the outer diameter T2 of the tenth surface 72 of the fifth lens 7 satisfies: 1<T1 / T2<1.3.

[0108] From an optical design perspective, the sixth lens element 8, a key element in narrowing the light beam, gradually converges incoming light from a large field of view, reducing its divergence angle, thereby providing a more manageable light distribution for subsequent lenses, such as the fifth lens element 7. In terms of optical layout, the fifth lens element 7 follows the sixth lens element 8, and its design must match the optical properties of the sixth lens element 8 to further optimize the optical path, reduce aberrations, and improve overall imaging quality.

[0109] Specifically, the sixth lens element 8 acts as a beam constrictor, and its eleventh surface 81 has a relatively large outer diameter T1, which helps collect and initially converge light over a wider area. By properly designing the ratio of T1 to the outer diameter T2 of the tenth surface 72 of the fifth lens element 7 (i.e., satisfying 1 < T1 / T2 < 1.3), light can be ensured to enter the fifth lens element 7 with an appropriate beam width after passing through the sixth lens element 8, avoiding edge light loss due to an excessively wide beam or excessive central light concentration due to an excessively narrow beam.

[0110] The fifth lens element 7 is positioned immediately after the sixth lens element 8, and the ratio between the outer diameter T2 of the tenth surface 72 of the fifth lens element 7 and the outer diameter T1 of the eleventh surface 81 of the sixth lens element 8 facilitates a smooth transition of the optical path from the sixth lens element 8 to the fifth lens element 7. This transition design can reduce reflection and scattering of light between the lenses, improve light utilization, and reduce aberrations caused by sudden changes in the optical path.

[0111] By controlling the ratio of T1 to T2, the further light processing effect of the fifth lens element 7 can be optimized. The fifth lens element 7 can more effectively correct the residual aberrations introduced by the sixth lens element 8, such as spherical aberration and coma, thereby improving image clarity and contrast. Furthermore, a reasonable outer diameter ratio helps maintain uniform light distribution and avoid performance differences between the center and the edges of the image.

[0112] In some examples of the present application, the outer diameter T3 of the fifth lens 7 and the outer diameter T4 of the fourth lens 6 satisfy the following relationship: 1.2 mm ≤ T3 - T4 ≤ 3.6 mm.

[0113] In the example provided herein, the outer diameter relationship between the fifth lens element 7 and the fourth lens element 6 is specifically specified to have a range of difference between the outer diameter T3 of the fifth lens element 7 and the outer diameter T4 of the fourth lens element 6, namely, 1.2mm≤T3-T4≤3.6mm. This design is based on comprehensive considerations of the overall performance of the imaging lens module and the optical path transition between the lenses.

[0114] By controlling the difference in outer diameter between the fifth lens element 7 and the fourth lens element 6, the transition of light between the two lenses is ensured to be smoother, reducing optical path discontinuities caused by sudden changes in lens size. This design helps reduce aberrations such as spherical aberration and coma, thereby improving image clarity and contrast.

[0115] In some examples of the present application, the optical power φ1' of the first lens group and the optical power φ2' of the second lens group are both negative, the optical power φ3' of the third lens group is positive, and the following is satisfied: (φ1'+φ2'+φ3')>0.

[0116] This application achieves multiple technical effects such as balancing large field of view and high resolution, effectively correcting aberrations, and improving module stability by precisely controlling the optical focal length configuration of the first lens group, the second lens group, and the third lens group.

[0117] In some examples of this application, see Figure 1 and Figure 6 The imaging lens module further includes a protective glass 2 located between the image sensor 1 and the first lens 3 . The protective glass 2 includes two adjacent and spaced glass plates.

[0118] The protective glass 2 can protect the image sensor 1 from damage from the external environment.

[0119] The present application achieves significant technical effects in terms of enhancing protection performance and improving module stability by adding a protective glass 2 consisting of two adjacent and spaced glass plates.

[0120] See also Figure 1 , Figure 1 The optical path diagram of the imaging lens module provided in an embodiment of the present application is shown. An image sensor 1 is provided on the image side to receive incident light. Real-world light sequentially passes through the sixth lens element 8, the fifth lens element 7, the fourth lens element 6, the third lens element 5, the second lens element 4, the first lens element 3, and the protective glass 2 before reaching the image sensor 1.

[0121] The imaging lens module provided in the embodiment of the present application includes an optical lens comprising a material with a refractive index n and a dispersion coefficient v in the range of: 1.4 <n<2.0,20<v<75。

[0122] The imaging lens module of the present application is described below through Example 1 and Example 2 respectively.

[0123] Example 1

[0124] See also Figure 1 The imaging lens module provided in this embodiment 1 includes, from the image side to the object side, an image sensor 1, a protective glass 2, a fourth lens group, a third lens group, an aperture 9, a second lens group, and a first lens group in sequence along the same optical axis;

[0125] The protective glass 2 includes two glass plates that are adjacent and spaced apart;

[0126] The first lens group includes a sixth lens 8 having negative optical power, which is used to deflect off-axis light incident from a large field of view toward the optical axis to narrow the light beam;

[0127] The second lens group includes a fifth lens 7 and a fourth lens 6, which are used to correct off-axis aberrations caused by incident light with a large field of view;

[0128] The third lens group includes a third lens 5, the thermal expansion coefficient of which is less than 10×10 -6 / ℃, used to keep the focal length of the imaging lens module stable under different temperature conditions, thereby eliminating defocusing;

[0129] The fourth lens group includes a second lens 4 and a first lens 3, and is used to correct aperture aberration and balance the high-order aberrations introduced by the second lens group;

[0130] The optical power φ1' of the first lens group, the optical power φ2' of the second lens group, the optical power φ3' of the third lens group, and the optical power φ4' of the fourth lens group are shown in Table 1 below:

[0131] Table 1

[0132]

[0133] The main optical parameters of the imaging lens module provided in this embodiment 1 are shown in Table 2 below.

[0134] Table 2

[0135]

[0136] The imaging lens module provided in this embodiment 1 has the following optical properties: Figures 2 to 5 As shown: Figure 2 is a point diagram diagram. Figure 3 is the MTF curve graph, Figure 4 It is the field curvature and distortion diagram, Figure 5 is the vertical axis chromatic aberration diagram. Figures 2 to 5 Perform analysis:

[0137] See also Figure 2 In the imaging lens module provided in this embodiment 1, the maximum value of the image point in the point diagram is less than 34 μm.

[0138] See also Figure 3 The imaging lens module provided in this embodiment 1 has an MTF greater than 0.4 at 70 lp / mm.

[0139] See also Figure 4 In the imaging lens module provided in this embodiment 1, the maximum distortion occurs in 1 field of view, and the absolute value is less than 90%.

[0140] See also Figure 5 The imaging lens module provided in this embodiment 1 has a maximum chromatic aberration value of less than 24 μm.

[0141] Example 2

[0142] See also Figure 6The imaging lens module provided in this embodiment 2 includes, from the image side to the object side, an image sensor 1, a protective glass 2, a fourth lens group, a third lens group, an aperture 9, a second lens group, and a first lens group in sequence along the same optical axis;

[0143] The protective glass 2 includes two glass plates that are adjacent and spaced apart;

[0144] The first lens group includes a sixth lens 8 having negative optical power, which is used to deflect off-axis light incident from a large field of view toward the optical axis to narrow the light beam;

[0145] The second lens group includes a fifth lens 7 and a fourth lens 6, which are used to correct off-axis aberrations caused by incident light with a large field of view;

[0146] The third lens group includes a third lens 5, the thermal expansion coefficient of which is less than 10×10 -6 / ℃, used to keep the focal length of the imaging lens module stable under different temperature conditions, thereby eliminating defocusing;

[0147] The fourth lens group includes a second lens 4 and a first lens 3, and is used to correct aperture aberration and balance the high-order aberrations introduced by the second lens group;

[0148] The optical power φ1' of the first lens group, the optical power φ2' of the second lens group, the optical power φ3' of the third lens group, and the optical power φ4' of the fourth lens group are shown in Table 3 below:

[0149] Table 3

[0150]

[0151] The main optical parameters of the AR optical module provided in this embodiment 2 are shown in Table 4 below.

[0152] Table 4

[0153]

[0154] The imaging lens module provided in Example 2 has the following optical properties: Figures 7 to 10 As shown: Figure 7 is a point diagram diagram. Figure 8 is the MTF curve graph, Figure 9 It is the field curvature and distortion diagram, Figure 10 This is a diagram of vertical chromatic aberration.

[0155] See also Figure 7 In the imaging lens module provided in this embodiment 2, the maximum value of the image point in the point diagram is less than 15 μm.

[0156] See also Figure 8The imaging lens module provided in this embodiment 2 has an MTF greater than 0.5 at 70 lp / mm.

[0157] See also Figure 9 In the imaging lens module provided in this embodiment 2, the maximum distortion occurs in 1 field of view, and the absolute value is less than 90%.

[0158] See also Figure 10 The imaging lens module provided in this embodiment 3 has a maximum chromatic aberration value of less than 24 μm.

[0159] According to another embodiment of the present application, an optical display device is provided, comprising a housing and the imaging lens module as described above.

[0160] The specific implementation of the optical display device of the embodiment of the present application can refer to the various embodiments of the imaging lens module described above, and therefore at least has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0161] The above embodiments focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0162] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above examples may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An imaging lens module, characterized in that: From the image side to the object side, it includes: an image sensor (1), a fourth lens group, a third lens group, an aperture (9), a second lens group, and a first lens group; The first lens group includes a sixth lens (8) having a negative optical power and used for deflecting off-axis light incident from a large field of view toward the optical axis to narrow the light beam; The second lens group comprises a fifth lens (7) and a fourth lens (6), and is used to correct off-axis aberration caused by incident light with a large field of view; the second lens group satisfies: |φ5+φ4|≤0.3; wherein φ5 is the optical focal length of the fifth lens (7), and φ4 is the optical focal length of the fourth lens (6); The third lens group includes a third lens (5), the thermal expansion coefficient of which is less than or equal to 10×10 -6 / ℃, used to keep the focal length of the imaging lens module stable under different temperature conditions, thereby eliminating defocusing; The fourth lens group comprises a second lens (4) and a first lens (3), and is used to correct aperture aberration and balance high-order aberrations introduced by the second lens group; the fourth lens group satisfies: |φ2+φ1|≤0.15; wherein φ2 is the optical power of the second lens (4), and φ1 is the optical power of the first lens (3); The optical power φ1' of the first lens group, the optical power φ2' of the second lens group, the optical power φ3' of the third lens group and the optical power φ4' of the fourth lens group satisfy the following relationship: 0.5≤|(φ1'+φ2'+φ3') / φ4'|≤3.

5.

2. The imaging lens module according to claim 1, wherein: The sixth lens (8) comprises an eleventh surface (81) close to the image sensor (1) and a twelfth surface (82) away from the image sensor (1), and both the eleventh surface (81) and the twelfth surface (82) are bent toward the image sensor (1); The ratio of the effective optical aperture D1 of the eleventh surface (81) to the effective optical aperture D2 of the twelfth surface (82) satisfies: D1 / D2≤0.

5.

3. The imaging lens module according to claim 1, wherein: The aperture (9) is located between the fourth lens (6) and the third lens (5); The distance between the aperture (9) and the fourth lens (6) along the optical axis is L1, and the distance between the aperture (9) and the third lens (5) along the optical axis is L2, and the following conditions are satisfied: 0.1 mm ≤ L1 ≤ 1 mm and 0.1 mm ≤ L2 ≤ 1 mm.

4. The imaging lens module according to claim 1, wherein: The lenses in the first lens group, the second lens group and the fourth lens group are made of plastic.

5. The imaging lens module according to claim 1, wherein: The fifth lens (7) comprises a ninth surface (71) close to the image sensor (1) and a tenth surface (72) away from the image sensor (1); The ratio between the outer diameter T1 of the eleventh surface (81) of the sixth lens (8) and the outer diameter T2 of the tenth surface (72) of the fifth lens (7) satisfies: 1<T1 / T2<1.3; wherein the eleventh surface (81) is the image side surface of the sixth lens (8).

6. The imaging lens module according to claim 5, wherein: The outer diameter T3 of the image side surface of the fifth lens (7) and the outer diameter T4 of the object side surface of the fourth lens (6) satisfy the following relationship: 1.2 mm ≤ T3 - T4 ≤ 3.6 mm.

7. The imaging lens module according to claim 1, wherein: The focal power φ1' of the first lens group and the focal power φ2' of the second lens group are both negative, the focal power φ3' of the third lens group is positive, and the following conditions are satisfied: (φ1'+φ2'+φ3')>0.

8. The imaging lens module according to any one of claims 1 to 7, wherein: The imaging lens module further comprises a protective glass (2) located between the image sensor (1) and the first lens (3), wherein the protective glass (2) comprises two adjacent and spaced glass plates.

9. An optical display device, characterized in that: include: shell; and The imaging lens module according to any one of claims 1 to 8.

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