A lens module for close-range detection

Abstract

"A LENS MODULE FOR CLOSE-RANGE DETECTION" The present disclosure relates to a lens module (100) The lens module (100) comprises a lens barrel (101), an optical lens assembly (102) disposed in the lens 5 barrel (101). The optical lens assembly (102) comprises a plurality of optical elements (103) positioned between an object plane (104) and an image plane (105) of the optical lens assembly (102). An image sensor (106) disposed on the image plane (105) of the optical lens assembly (102). A focusing mechanism (107) is configured to allow for manual adjustment of focus of at least one of the plurality 10 of optical elements (103). A flange (108) is affixed to the lens barrel (101), defining fastening features to secure the optical lens assembly (102). An air gap (110) is defined between at least one of the plurality of optical elements (103) to improve optical performance and reduce aberrations. 15 [Referred to Figure 1]

Description

[0001] A LENS MODULE FOR CLOSE-RANGE DETECTION

[0002] TECHNICAL FIELD

[0003]

[0001] The present invention relates to the field of optical lens and optical imaging technology. Particularly, the present invention relates to an optical imaging lens system for close-range detection in medical diagnostics.

[0004] BACKGROUND

[0005]

[0002] The information in this section merely provides background information related to the present invention and may not constitute prior art(s) for the present disclosure.

[0006]

[0003] An optical imaging lens system is composed of essential components such as an objective lens, imaging lens, aperture, and sensors. These components work together to capture and focus light, ensuring the production of clear images. With rapid technological advancements, the applications of these lens systems have expanded significantly, and the requirements for their functionality have become more diverse. Today, these systems are used in various devices and fields, including cameras, smartphones, scientific instruments, and medical diagnostic tools. Furthermore, the growing demand for high-resolution imaging, driven by economic and social developments, has increased the need for advanced high-definition optical systems.

[0007]

[0004] Modern optical imaging lens systems incorporate advanced lenses and image sensors, including aspherical lenses, Fresnel lenses, gradient index (GRIN) lenses, diffractive optical elements (DOEs), and superlenses. Aspherical lenses, with their non-spherical surfaces, minimize optical distortions (aberrations) compared to conventional spherical lenses, allowing for more compact and higher-performance systems. Fresnel lenses use concentric grooves to create thinner and lighter lenses that still offer strong focusing power, which are commonly found in

[0008] 2applications like camera lenses and lighthouse lamps. GRIN lenses, whose refractive index changes across the lens, enable focusing without a curved surface, making them ideal for flat and compact designs. DOEs use etched diffraction patterns on their surfaces to manipulate light waves, making very thin and lightweight lens designs possible. Superlenses, made from metamaterials, exceed the diffraction limit, enabling imaging at resolutions beyond what conventional optics can achieve.

[0009]

[0005] Despite these advancements, existing optical imaging lens systems still face several limitations. First, many lenses have low quantum efficiency, which decreases their sensitivity and signal-to-noise ratio, especially in situations like close-range imaging of tissues or biological samples, where light is reflected from multiple angles. Second, these lenses often have a limited spectral range, reducing their ability to capture light across various wavelengths. Third, they have a restricted dynamic range, making it difficult to capture both bright and dark areas accurately within the same image, leading to a loss of detail in high-contrast environments. Many current lenses are bulky and heavy, which limits their use in portable or handheld devices, especially in medical imaging applications where lightweight and compact designs are crucial for accessibility and versatility. They do not provide high-end optics for imaging applications, have high power consumption, low quantum efficiency, and high distortion. Lastly, poor signal-to-noise ratios due to background interference reduce image quality, affecting the accuracy of diagnostics.

[0010]

[0006] The present disclosure is directed to overcome one or more limitations stated above or any other limitations associated with the prior art.

[0011] SUMMARY

[0012]

[0007] The one or more shortcomings of the prior art are overcome by the system / assembly as claimed, and additional advantages are provided through the provision of the system / assembly / method as claimed in the present disclosure.Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

[0013]

[0008] In one non-limiting embodiment of the present disclosure, a lens module is disclosed. The lens module comprises, a lens barrel, an optical lens assembly disposed in the lens barrel. The optical lens assembly comprises a plurality of optical elements positioned between an object plane and an image plane of the optical lens assembly. An image sensor is disposed on the image plane of the optical lens assembly. A focusing mechanism is incorporated into the lens barrel. The focusing mechanism is configured to allow for manual adjustment of focus of at least one of the plurality of optical elements over a specified range. A flange is affixed to the lens barrel, defining fastening features to secure the optical lens assembly and provide additional mechanical support. A band-pass filter is disposed on the object plane of the optical lens assembly. An air gap is defined between at least one of the plurality of optical elements to improve optical performance and reduce aberrations, allowing precise control over path of light.

[0014]

[0009] In an embodiment of the present disclosure, the plurality of optical elements of the optical lens assembly comprises at least eight lenses with an anti -refl ection coating. The plurality of optical elements is positioned between the object plane and the image plane of the optical lens assembly.

[0015]

[0010] In an embodiment of the present disclosure, the plurality of optical elements comprises six singlet lens configurations and two doublet lens configurations.

[0016] [OH] In an embodiment of the present disclosure, the focusing mechanism allows adjusting the focus of at least one of the plurality of optical elements within a predefined range.

[0017]

[0012] In an embodiment of the present disclosure, the lens barrel is configured to maintain tight tolerances between the plurality of optical elements.

[0013] In an embodiment of the present disclosure, the flange includes at least six fastening points connected by M4 screws.

[0018]

[0014] In an embodiment of the present disclosure, the lens barrel comprises a CS-mount male connector configured to interface with a corresponding CS-mount female connector of the optical lens assembly.

[0019]

[0015] In an embodiment of the present disclosure, the CS-mount male connector includes a threaded connection allowing for rotational adjustment of at least a portion of the optical lens assembly relative to the lens barrel. The distance of the image sensor in the camera module architecture is fixed from the last lens element and connected to the camera module using CS-mounts (male and female connectors).

[0020]

[0016] In an embodiment of the present disclosure, the band-pass filter is configured to selectively allow light transmission within a wavelength range of 400 nm to 1000 nm.

[0021]

[0017] In an embodiment of the present disclosure, the air gap is positioned between the ninth and the tenth optical elements in the optical lens assembly.

[0022]

[0018] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the disclosure.

[0023]

[0019] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

[0024] BRIEF DESCRIPTION OF FIGURES

[0025] 5

[0020] The novel features and characteristics of the disclosure are set forth in the description. The disclosure itself, however, as well as a preferred mode of use, further objectives, and advantages thereof, will best be understood by reference to the following description of an illustrative embodiment when read in conjunction with the accompanying drawings. One or more embodiments are now described, by way of example only, with reference to the accompanying drawings wherein like reference numerals represent like elements and in which:

[0026]

[0021] Figure 1 illustrates a schematic diagram of a lens module, according to an embodiment of the present disclosure.

[0027]

[0022] Figure 2 illustrates a schematic diagram of an optical lens assembly, according to an embodiment of the present disclosure.

[0028]

[0023] Figure 3 illustrates a perspective view of the lens module, according to an embodiment of the present disclosure.

[0029]

[0024] Figure 4 illustrates a sectional view of the lens module, according to an embodiment of the present disclosure.

[0030]

[0025] Figure 5 illustrates an optical layout of the optical lens assembly, according to an embodiment of the present disclosure.

[0031]

[0026] Skilled artisans will appreciate that elements in the drawings are illustrated for simplicity and have not necessarily been drawn to scale. For example, the dimensions of some of the elements in the drawings may be exaggerated relative to other elements to help to improve understanding of embodiments of the present disclosure.

[0032] DETAILED DESCRIPTION

[0033] 6

[0027] While the present invention is susceptible to various modifications and alternative forms, specific embodiments thereof have been shown by way of example in the Figures, and will be described in detail below. It should be understood, however, that it is not intended to limit the present invention to the particular forms disclosed, but on the contrary, the present invention is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure.

[0034]

[0028] Before describing detailed embodiments, it may be observed that the novelty and inventive step that are in accordance with the present invention resides in a lens module. It is to be noted that a person skilled in the art can be motivated from the present invention and modify the various constructions of the lens module. However, such modification should be construed within the scope of the present disclosure. Accordingly, the drawings show only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the present invention with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

[0035]

[0029] In the present disclosure, the term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any embodiment or implementation of the present subject matter described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0036]

[0030] The terms “comprise”, “comprising”, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a device that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such setup or device. In other words, one or more elements in a system or apparatus proceeded by “comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.

[0031] Reference will now be made to the exemplary embodiments of the disclosure, as illustrated in the accompanying drawings. Wherever possible, the same numerals will be used to refer to the same or like parts. Embodiments of the disclosure are described in the following paragraphs with reference to Figures 1 to 5. In Figures 1 to 5, the same elements or elements that have the same functions are indicated by the same reference signs.

[0037]

[0032] Referring to Figure 1, the present disclosure relates to a lens module (100) in accordance with an embodiment of the present disclosure. The lens module (100) is configured to offer enhanced flexibility, precision, and image quality, making it ideal for use in advanced optical applications such as machine vision, medical imaging, and scientific observation. The lens module (100) is constructed from carefully selected components, each of which contributes to its superior optical performance, structural integrity, and ease of integration. The lens module (100) comprises a lens barrel (101), and an optical lens assembly (102) disposed in the lens barrel (101). Referring to Figure 4, the optical lens assembly (102) comprises a plurality of optical elements (103), each positioned to ensure that light entering the lens module (100) is accurately focused and transmitted to an image sensor (106). The plurality of optical elements (103) is configured between an object plane (104) and an image plane (105), forming a complete optical path that captures images with high resolution and clarity.

[0038]

[0033] The lens barrel (101) is configured to provide a structural support to the optical lens assembly (102) of the lens module (100). In an embodiment, the lens barrel (101) is constructed from a high-grade material, chosen for its rigidity and ability to maintain tight manufacturing tolerances. Referring to Figure 1 again, the lens barrel (101) along with the optical lens assembly (102) are provided inside a protective cover, referred to as a hood (116) of the lens module (100). Further, the lens module (100) includes an outer case (117). This ensures that the positions of the optical elements (103) remain stable and fixed, even in challenging environments where mechanical stresses, temperature fluctuations, or vibrationsmay otherwise affect optical alignment. The precise alignment of these optical elements (103) is essential to maintaining the lens module’s optical performance.

[0039]

[0034] The lens barrel (101) is configured to accommodate the plurality of optical elements (103) and additional components, such as a focusing mechanism (107), a flange (108), and a band-pass filter (109). In an embodiment, a CS-mount male connector (not shown in Figures) is integrated into the lens barrel (101) to facilitate quick and secure attachment through a CS-mount female connector. This makes the module highly adaptable to a wide range of existing imaging systems, allowing for easy swapping of lenses or reconfiguration of the optical setup without needing complex recalibration or custom mounts.

[0040]

[0035] Referring to Figure 2, the optical lens assembly (102) is disclosed in accordance with an embodiment of the present disclosure. The optical lens assembly (102) is a core functional component of the lens module (100), in which light enters, passes through the plurality of optical elements (103), and is focused onto the image sensor (106). The optical lens assembly (102) comprises the plurality of optical elements (103). In an embodiment, the optical lens assembly (102) comprises at least eight lenses (111) arranged sequentially between the object plane (104) and image plane (105). In an embodiment, the plurality of optical elements (103) includes six singlet lens configurations (112a, 112b, 112c, 112d, 112e, 112f) and two doublet lens configurations (113a, 113b). The plurality of optical elements (103) allows the lens module (100) to reduce spherical, astigmatism, coma, field curvature, distortion, and chromatic aberrations within a wavelength range of 400-1000 nm to achieve the required performance.

[0041]

[0036] Referring to Figure 2 along with Figure 1, the plurality of optical elements (103) includes a first singlet lens (112a), a second singlet lens (112b), a third singlet lens (112c), a fourth singlet lens (112d), a fifth singlet lens (112e), and a sixth singlet lens (112f). In an embodiment, a spacer ring (118) is positioned in between

[0042] 9the first singlet lens (112a) and the second singlet lens (112b). The plurality of optical elements (103) further includes a first doublet lens (113a) and a second doublet lens (113b). The configuration of the six singlet lens configurations (112a, 112b, 112c, 112d, 112e, 112f) and the two doublet lens configurations (113a, 113b) is arranged in sequence, each represented by curved black outlines in Figure 2.

[0043]

[0037] The singlet lenses (112a, 112b, 112c, 112d, 112e, 112f) are standalone lens elements, while the doublet lenses (113a, 113b) are paired lens elements configured to enhance optical performance. The configuration of these lenses is arranged to deliver specific optical characteristics, with each lens contributing to distinct aspects of light manipulation. Referring to Figure 1, the lens module (100) includes a plurality of sub-assemblies (125, 126, 127). In an embodiment, the plurality of sub-assemblies (125, 126, 127) comprises a first sub-assembly (125), a second subassembly (126), and a third sub-assembly (127). In an embodiment, the first subassembly (125) includes a filter mount (132) defined with a retainer ring. Figure 1 shows a plurality of retainer ring such as a retainer ring (120) for the first singlet lens (112a), a retainer ring (123) for the second doublet lens (113b), and a retainer ring (123) for the sixth singlet lens (112f). In an embodiment, the second subassembly (126) comprises the lens barrel (101) of the third singlet lens (112c), the fourth singlet lens (112d), the fifth singlet lens (112e). In an embodiment, the third sub-assembly (127) comprises the lens barrel (101) of the first doublet lens (113a) and the second doublet lens (113b). In an embodiment, at least one O-ring (121) is positioned in the lens module (100).

[0044]

[0038] The optical characteristics begin with an initial lens group incorporating a wide-angle or retro-focus design with multiple group corrections, allowing significant ray bending to accommodate a broader field of view. In the middle section of the lens arrangement, rays interact with elements that correct various optical aberrations, including spherical aberration, chromatic aberration, field curvature, and distortion. The middle section of the lenses is for ray interactions with correction for various optical aberrations. The final elements demonstrate ray

[0045] 10convergence with the imaging system’s focus formation. This corrective process is further demonstrated by the multiple-coloured ray paths in Figure 5, which highlight how light of different wavelengths minimizes chromatic dispersion. The final lens elements guide the rays toward convergence, forming a focused image at the imaging system's focal plane.

[0046]

[0039] The first doublet lens is composed of LAI-1 (113a) and LAI-2 (113a). LA1-1 has a diameter of 11.5 mm, a center thickness of 3.25 mm, and radii of curvature R1 and R2 of 19.20 mm and 8.16 mm, respectively. LAI-2 features a diameter of 12.50 mm, a center thickness of 5.75 mm, and radii of curvature R3 and R4 of 8.00 mm and 28.14 mm, respectively. The pairing of these lenses into a doublet minimizes chromatic aberration and optimizes light convergence. It is to be noted that the range defined in the present disclosure are not limited to the scope of the disclosure.

[0047]

[0040] The second doublet lens comprises LA5-1 (113b) and LA5-2 (113b). LA5-1 has a diameter of 11 mm, a center thickness of 1.75 mm, and radii of curvature R1 and R2 of 20.72 mm and 10.02 mm, respectively. LA5-2, with a diameter of 10 mm, has a center thickness of 3.55 mm and radii of curvature R3 and R4 of 10.18 mm and 16.51 mm, respectively. This doublet configuration enhances the optical system's ability to correct spherical and chromatic aberrations, further improving image sharpness and clarity.

[0048]

[0041] In addition to the doublet lenses, the assembly includes singlet lenses, each contributing specific optical properties. LA2 (112c) has a diameter of 10.20 mm, a center thickness of 5.75 mm, and radii of curvature R1 and R2 of 7.15 mm and 8.70 mm, respectively. LA3 (112d), the largest singlet lens in terms of diameter, measures 22 mm with a center thickness of 5.75 mm, and radii of curvature R1 and R2 of 12.76 mm and 5.92 mm, respectively, with the second diameter specified as critical in the optical design.

[0049] 11

[0042] LA4 (112e) has a diameter of 13 mm, a center thickness of 2.53 mm, and radii of curvature R1 and R2 of 17.44 mm and 24.72 mm, respectively. LA6 (112f) has a diameter of 11 mm, a center thickness of 3.75 mm, and radii of curvature R1 and R2 of 42.47 mm and 17.82 mm, respectively. Finally, LA8 features a diameter of 12 mm, a center thickness of 4.08 mm, and radii of curvature R1 and R2 of 7.80 mm and 12.52 mm, respectively.

[0050]

[0043] The combination of these singlet and doublet lenses, each meticulously designed with specific dimensions and optical characteristics, ensures the optical assembly meets the rigorous requirements for high-performance imaging. The disclosed optical assembly achieves superior image quality while maintaining a compact and efficient design by addressing a wide range of optical aberrations and optimizing light transmission.

[0051]

[0044] In an embodiment, due to the combination of the plurality of optical elements (103) with six singlet lens configurations (112a, 112b, 112c, 112d, 112e, 112f) and two doublet lens configurations (113a, 113b), the optical lens assembly (102) is configured to manage multiple forms of aberration, including spherical aberrations, chromatic aberrations, and astigmatism, to produce clearer, sharper images. In an embodiment, each lens surface of the plurality of optical elements (103) is treated with an anti-reflection coating, which minimizes light loss due to surface reflections. This coating reduces unwanted glare and flare, which can distort image quality, especially in high-contrast or brightly lit environments. In an embodiment, the optical lens assembly (102) is constructed as per the size of the image sensor (106) of 1 / 1.8" with an image area of approximately 7736.256 pm x 4379.616 pm without limiting the scope of the present disclosure. The assembly supports a focal length of 12 mm and an aperture of 4.5 mm, providing a field of view (FoV) of approximately 58.5 degrees. In an embodiment, the assembly accommodates an object distance ranging from 50 mm to 2 meters with a focusing range of 50 mm to 2000 mm, without limiting the scope of the disclosure. It is to

[0052] 12be noted that the range defined in the present disclosure are not limited to the scope of the disclosure.

[0053]

[0045] The system delivers exceptional optical precision, with minimal TV distortion ranging from 6% at 50 mm to just 0.01% at 2 meters, and a relative illumination level of 99%. The lens performance exceeds 30% at 70 Ip / mm, ensuring high-resolution imaging across its field. In an embodiment, the lens assembly (102) is mounted using a CS-mount or C-mount, supporting secure attachment and ease of integration into various systems.

[0054]

[0046] In an embodiment, the total length of the lens assembly (102) is less than 100 mm, and its mass is under 450 grams, highlighting its compact and lightweight design. The lens assembly (102) is optimized for wavelengths between 400-1000 nm, making it versatile for applications requiring sensitivity across a broad spectral range. Additionally, the complete lens assembly (102) is intended to move backward from its initial position (e.g., by 3.6 mm for an object distance of 50 mm) to facilitate focusing adjustments. These specifications make the optical lens assembly (102) a highly adaptable and high-performing solution for a range of imaging applications.

[0055]

[0047] In an embodiment, the plurality of optical elements (103) within the optical lens assembly (102) includes an air gap (110) strategically positioned between the ninth element (113b) and the tenth element (112f). This air gap (110) is precisely engineered to enhance the optical performance of the assembly by providing additional correction for optical aberrations. By introducing a controlled separation, the air gap influences how light is refracted as it travels through the optical lens assembly (102), contributing to improved image clarity and fidelity.

[0056]

[0048] The air gap (110) is further optimized for varying object distances, allowing the optical system to adapt effectively to different imaging requirements. For instance, with an air gap of 3.6 mm, the object distance is 50 mm, while a reducedair gap of 0.9 mm corresponds to an extended object distance of 2000 mm. This adaptability highlights the versatility of the optical design in accommodating diverse imaging scenarios. To ensure optimal performance and durability, the optical lens assembly (102) is encased within a high-precision metal casing. This casing is manufactured with tight tolerances to provide structural integrity and alignment accuracy, minimizing mechanical aberrations and ensuring consistent results. The combination of carefully calibrated air gaps and robust construction underscores the meticulous engineering involved in achieving superior optical performance.

[0057]

[0049] The optical lens assembly (102) is constructed with extremely tight tolerances to ensure optimal performance and image quality. The lens barrel is equipped with a fine focusing mechanism, offering an adjustment range of 0.5- 5 mm, which allows for precise data capture and analysis. In a preferred embodiment, the adjustment range is 0.9 - 3.6mm, without limiting the scope of the disclosure. This mechanism requires manual adjustment of the focusing ring for operation. A detachable protective hood is threaded onto the front side of the barrel for additional protection, and the same threading mechanism can be utilized for mounting other assemblies if required. Additionally, the flange of the barrel is equipped with six M4-standard taps, providing further mounting or support options for the unit. In an embodiment, these taps provide mounting options for additional components, such as external supports, brackets, or mounting plates, which can be used to secure the optical lens assembly (102) during operation.

[0058]

[0050] The optical lens assembly (102) incorporates the band-pass filter (109), with a diameter of 25 mm. This filter is mounted securely but remains detachable for easy replacement or maintenance. The opposite end of the lens barrel features a C-mount thread, enabling the assembly to interface seamlessly with various imaging systems. For final operation, the user must attach a CS-mount adapter to the optical lens assembly (102) before connecting it to the camera. The total weight of the complete assembly, including the protective hood, is approximately 0.157 kg. Thesystem’s performance is highly dependent on the precise configuration of the optical elements (112a, 112b, 112c, 112d, 112e, 112f, 113a, 113b), the accuracy of the sub-assemblies, and the integrity of the main assembly.

[0059]

[0051] In an embodiment, the lens module (100) comprises the image sensor (106), where the focused light from the optical lens assembly (102) is captured. The image sensor (106) is configured to work in conjunction with the lens module (100) to capture high-resolution images across a wide spectral range. In an embodiment, the image sensor (106) is configured for a size of 1 / 1.8", with an image area of approximately 7736.256 pm x 4379.616 pm. This makes it highly suitable for high-resolution imaging. In an embodiment, the image sensor (106) is of size 8.89 mm. The distance of the image sensor (106) in the lens module architecture is fixed from the last lens element (112f) and connected to the lens module (100) using CS-mounts (male and female connectors). This alignment is facilitated by the lens barrel (101), which maintains the optical elements in the correct positions, reducing the risk of optical misalignment that could distort the image.

[0060]

[0052] In an embodiment, the lens module (100) is configured to optimize performance across both the visible spectrum (400 nm to 1000 nm) and the nearinfrared (NIR) spectrum, extending up to 940 nm. This makes the lens module (100) suitable for hybrid imaging applications, where both visible and infrared information need to be captured. The usage of the band-pass filter (109) further enhances the module's ability to selectively allow light from specific wavelength ranges to pass through while blocking unwanted frequencies, improving the clarity and relevance of the captured image.

[0061]

[0053] Referring to Figure 3, the lens module (100) comprises the focusing mechanism (107) incorporated into the lens barrel (101). The focusing mechanism (107) allows for manual adjustment of at least one of the plurality of optical elements (103) to achieve precise focus over a specified range. In an embodiment, the focusing mechanism (107) provides a focusing range of 0.5 mm to 5 mm for

[0062] 15close-range imaging applications where fine adjustments are necessary to capture small details accurately. In an embodiment, the focusing mechanism (107) operates through a focusing rings and subrings (119, 128 130), which can be manually rotated to adjust the relative position of one or more optical elements (103). This adjustment changes the focal length of the lens module (100). In an embodiment, a guide pin (122) is provided in the focusing mechanism (107) for the focusing rings and subrings (119, 128 130). The focusing range of the module allows it to accommodate objects located between 50 mm and 2000 mm distance from the lens module (100). In an embodiment, the focusing rings and subrings (119, 128 130) defines a resolution of 0.75mm per rotation.

[0063]

[0054] In an embodiment, the lens module (100) defines the flange (108), which is affixed to the lens barrel (101) to provide additional mechanical support and facilitate the attachment of the optical lens assembly (102). In an embodiment, the flange (108) includes at least six fastening points (114), which are connected using M4 screws (134). The screws provide a durable and rigid attachment, preventing any mechanical flexing or movement that could affect the alignment of the optical elements (103). Additionally, the flange's robust design provides the necessary support for the relatively large and heavy optical lens assembly (102), ensuring that the lenses remain perfectly aligned, even under mechanical stress or vibration.

[0064]

[0055] In an embodiment, the lens barrel (101) also includes the CS-mount male connector, which interfaces with the corresponding CS-mount female connector of the optical lens assembly (102). In an embodiment, the CS-mount male connector includes a threaded connection (115) allowing for rotational adjustment of at least a portion of the optical lens assembly (102) relative to the lens barrel (101). This configuration can be important in applications where the orientation of the image sensor needs to be finely tuned.

[0065]

[0056] In an embodiment, the band-pass filter (109) is located on the object plane (104) of the optical lens assembly (102). The band-pass filter (109) is configured to

[0066] 16block any unwanted wavelengths, such as ultraviolet (UV) or infrared (IR) light, that may cause image degradation or reduce the effectiveness of the imaging system for specific tasks. In an embodiment, the band-pass filter (109) is configured to selectively allow light transmission within a wavelength range of 400 nm to 1000 nm. In an embodiment, the band-pass filter (109) can be easily replaced or swapped out, allowing the lens module (100) to be reconfigured for different imaging tasks. In an embodiment, the band-pass filter (109) is held in place by the filter mount (132) defined with a retainer ring. The filter mount (132) is the structure that physically supports the band-pass filter. The filter mount (132) ensures that the filter remains aligned and stable within the optical path of the lens module (100). In an embodiment, the retainer ring of the filter mount (132) can be unscrewed to remove the band-pass filter (109) and replace it with one that has different transmission properties. This makes the lens module (100) highly adaptable, as it can be customized to suit the needs of various imaging applications.

[0067]

[0057] In an embodiment, the lens module (100) defines the air gap (110) between the ninth and tenth optical elements (113b, 112f). This air gap (110) serves multiple purposes in enhancing the optical performance of the lens module (100). In an embodiment, the air gap (110) improves the system's Modulation Transfer Function (MTF), which is a measure of the lens’ s ability to reproduce fine details in an image.

[0068]

[0058] In an embodiment, the anti -refl ection coating ensures that each lens surface has a 99% transmission rate, meaning that only 1% of the light is lost to reflection at each surface. With a total of ten optical elements (103) in the optical lens assembly (102), this results in an overall system transmission of 82%, calculated as 0.99A20, accounting for the two surfaces of each optical element (103). This high transmission rate ensures that the maximum light reaches the image sensor (106). The anti -refl ection coating also reduces unwanted reflections within the optical lens assembly (102).

[0069] 17

[0059] In an embodiment, the lens module (100) has an optical configuration that has been optimized to achieve a high Modulation Transfer Function (MTF) across the entire field of view. In an embodiment, the field of view (FOV) is in the range of 58.5 degrees. This means that the lens is capable of resolving fine details not just in the center of the image, but also towards the edges, where optical aberrations often degrade image quality. The optimization of the MTF is achieved through a combination of high-quality optical materials, precise lens design, and careful control of the spacing between optical elements. The use of doublet lenses (113a, 113b) helps to minimize chromatic aberration, while the air gap (110) between the ninth and tenth elements (113b, 112f) further refines the system's ability to focus light accurately across a wide range of wavelengths.

[0070]

[0060] In an embodiment, the lens barrel (101) has a fine focusing mechanism of 0.5 mm to 5 mm range to capture and analyze the close-range applications. The total weight of the lens module (100) is approximately. 130 g - 150g. The distance of the image sensor (106) in the lens module architecture is fixed from the last lens element (112f) and connected to the lens module (100) using CS-mounts (male and female connectors). The lens module (100) fabrication undergoes, and images and video can be transmitted from the image signal processor to the image interface (MIPI protocol) through a flexible printed circuit (FPC) using a connector attached to the fabricated carrier board controlled by a System-on-Module (SoM). The image / video acquisition can be made using application software.

[0071]

[0061] Figure 5 illustrates the optical layout of an optical lens assembly (102) housed within the lens barrel (101), in accordance with an embodiment of the present disclosure. This layout details the arrangement of individual optical elements (103) along an optical axis (CL), each precisely spaced and configured to achieve specific optical functions such as focusing, magnifying, or correcting aberrations. Each optical element (103) is characterized by unique properties, including focal length, curvature, and distance from adjacent elements, ensuring the assembly operates as intended.

[0072] 18

[0062] As shown in Figure 5, rays of light originating from the object plane (104) traverse through the optical lens assembly (102) before reaching the image plane (105). These rays, displayed in multiple colors (red, green, blue, yellow, and pink), vividly depict how light converges, diverges, or focuses at different points within the assembly. The 2D cross-sectional view of Figure 5 provides a clear visual representation, complete with a transparent coordinate system located at the bottom left corner. This system identifies the z-axis, corresponding to the optical axis, and the y-axis, indicating the vertical direction. The depiction highlights the dynamic interplay of light within the lens system, showcasing the effectiveness of the lens assembly in manipulating light to achieve the desired imaging outcomes.

[0073]

[0063] The optical lens assembly (102) is housed within the precisely engineered lens barrel (101), configured to securely hold the plurality of optical elements (103) in alignment while ensuring minimal optical distortion. The lens barrel (101) is constructed from high-quality, durable materials with tight manufacturing tolerances to ensure that each lens element (112a, 112b, 112c, 112d, 112e, 112f, 113a, 113b) is positioned accurately along the optical axis (CL). This lens barrel (101) serves to protect the optical elements (103) while minimizing any mechanical interference that could negatively impact the performance of the optical lens assembly (102).

[0074]

[0064] In addition, the lens barrel (101) features small holding components such as clamps, screws, or retention brackets that firmly secure each optical element (103) in place. These components prevent any movement or shifting of the plurality of optical elements (103) during use, ensuring that the optical lens assembly (102) remains stable under varying conditions, such as vibrations or temperature changes. The tight tolerances in the lens barrel (101) also help reduce the possibility of mechanical misalignment over time.

[0075] 19

[0065] To maintain the integrity of the lens module (100), the lens barrel (101) is equipped with adjustable stoppers (not shown in Figures) that are strategically positioned to limit the movement of the optical elements (103) along the optical axis (CL). These stoppers prevent over-travel or unintended shifts of the optical elements (103) when the focusing mechanism (0.5 mm to 5 mm range) is being adjusted. The stoppers also ensure the precise operation of the focusing rings and subrings (119, 128 130), which must be manually adjusted for fine-tuning. The focusing mechanism is configured to smoothly adjust the optical elements (103) to the appropriate distance from the image sensor (106), allowing for sharp focus at varying object distances ranging from 50 mm to 2000 mm.

[0076]

[0066] The lens module (100) described above offers a range of significant advantages that enhance the performance and versatility across multiple imaging applications. One of the primary benefits is its superior optical performance. The combination of singlet and doublet lenses in the optical lens assembly (102) is configured to minimize common optical aberrations, such as spherical and chromatic distortions. This precise lens arrangement ensures that images captured by the module are sharp, clear, and free from visual imperfections. Incorporating the air gap (110) between the optical elements (103) enhances this performance by providing additional control over light refraction. This results in improved focus accuracy and better overall image quality. The use of anti -refl ection coatings on each optical element further contributes to this by minimizing light loss and reducing unwanted reflections, thereby allowing more light to reach the image sensor (106) and ensuring high transmission efficiency, even in low-light conditions.

[0077]

[0067] In addition to optical clarity, the lens module (100) also excels in its versatile imaging capabilities, which make it suitable for a wide range of applications. The lens is capable of operating across both the visible and near-infrared (NIR) spectra, covering a wavelength range from 400 nm to 1000 nm. This dual-spectrum capability is particularly advantageous in industries that require hybrid imaging,

[0078] 20such as medical diagnostics, etc. The inclusion of the band-pass filter (109) enhances this versatility by selectively allowing certain wavelengths to pass through, ensuring that only the desired light is captured. The modular nature of the band-pass filter (109) also allows for easy customization, enabling the lens to be adapted to different imaging tasks by simply replacing the filter as needed.

[0079]

[0068] The lens module (100) is configured to address the requirements of closerange imaging applications, including healthcare applications, encompassing both visible and infrared imaging capabilities. This integration involves a high degree of complexity, requiring expertise in lens design, optical engineering, and materials science. The lens module (100) is optimized for hybrid sensors with elevated quantum efficiency in visible and infrared wavelengths.

[0080]

[0069] The various embodiments of the present invention have been described above with reference to the accompanying drawings. The present invention is not limited to the illustrated embodiments; rather, these embodiments are intended to fully and completely disclose the subject matter of the present invention to those skilled in this art. In the drawings, like numbers refer to like elements throughout. The thicknesses and dimensions of some components may be exaggerated for clarity.

[0081]

[0070] Herein, the terms “attached”, “connected”, “interconnected”, “contacting”, “mounted”, “coupled” and the like can mean either direct or indirect attachment or contact between elements unless stated otherwise.

[0082]

[0071] Well-known functions or constructions may not be described in detail for brevity and / or clarity. As used herein the expression “and / or” includes any and all combinations of one or more of the associated listed items.

[0083]

[0072] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used

[0084] 21herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “includes” and / or “including” when used in this specification, specify the presence of stated features, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, operations, elements, components, and / or groups thereof.

[0085]

[0073] While considerable emphasis has been placed herein on the particular features of this disclosure, it will be appreciated that various modifications can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other modifications in the nature of the disclosure or the preferred embodiments will be apparent to those skilled in the art from the present invention herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the present invention and not as a limitation.

[0086] EQUIVALENTS:

[0087]

[0074] The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.

[0088]

[0075] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and / or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such

[0089] 22adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

[0090]

[0076] Any discussion of documents, acts, materials, devices, articles and the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.

[0091]

[0077] The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher / lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.

[0092]

[0078] Reference numerals:

[0093]

[0094]

Claims

We Claim1. A lens module (100), comprising:a lens barrel (101);an optical lens assembly (102) disposed in the lens barrel (101), the optical lens assembly (102) comprises a plurality of optical elements (103) positioned between an object plane (104) and an image plane (105) of the optical lens assembly (102);an image sensor (106) disposed on the image plane (105) of the optical lens assembly (102);a focusing mechanism (107) incorporated into the lens barrel (101), the focusing mechanism (107) is configured to allow for manual adjustment of focus of at least one of the plurality of optical elements (103) over a specified range;a flange (108) affixed to the lens barrel (101), defining fastening features to secure the optical lens assembly (102) and provide additional mechanical support; anda band-pass filter (109) disposed on the object plane (104) of the optical lens assembly (102);wherein an air gap (110) is defined between at least one of the plurality of optical elements (103) to improve optical performance and reduce aberrations.

2. The lens module (100) as claimed in claim 1, wherein the plurality of optical elements (103) of the optical lens assembly (102) comprises at least eight lenses (111) having an anti -refl ection coating, the plurality of optical elements (103) is positioned between the object plane (104) and the image plane (105) of the optical lens assembly (102).

253. The lens module (100) as claimed in claim 2, wherein the plurality of optical elements (103) comprises six singlet lens configurations (112a, 112b, 112c, 112d, 112e, 112f) and two doublet lens configurations (113a, 113b).

4. The lens module (100) as claimed in claim 1, wherein the focusing mechanism (107) allows to adjust focus of at least one of the plurality of optical elements (103) within a predefined range.

5. The lens module (100) as claimed in claim 1, wherein the lens barrel (101) is configured to maintain tight tolerances between the plurality of optical elements (103).

6. The lens module (100) as claimed in claim 1, wherein the flange (108) includes at least six fastening points (114) connected by M4 screws (134).

7. The lens module (100) as claimed in claim 1, wherein the lens barrel (101) comprises a CS-mount male connector configured to interface with a corresponding CS-mount female connector of the optical lens assembly (102).

8. The lens module (100) as claimed in claim 7, wherein the CS-mount male connector includes a threaded connection (115) allowing for rotational adjustment of at least a portion of the optical lens assembly (102) relative to the lens barrel (101).

9. The lens module (100) as claimed in claim 1, wherein the band-pass filter (109) is configured to selectively allow transmission of light within a wavelength range of 400 nm to 1000 nm.

0. The lens module (100) as claimed in claim 1, wherein the air gap (110) is positioned between a ninth and a tenth optical elements (113b, 112f) in the optical lens assembly (102).

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