Miniaturized small-target-surface large-angle lens in obstacle avoidance field
By employing a combination of even-order aspherical lenses and a lens design made of plastic, the technical challenges of miniaturized lenses in terms of high resolution and low distortion have been solved, achieving low-cost and environmentally adaptable imaging effects suitable for obstacle avoidance and environmental perception in smart devices.
Patent Information
- Application Number
- CN202520235559.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-14
AI Technical Summary
Existing lenses struggle to balance high resolution and low distortion while pursuing miniaturization, and they are also costly, have poor environmental adaptability, and are complex to assemble, failing to meet the diverse needs of smart devices.
It employs an even-order aspherical lens combination, plastic material, and threaded focusing structure, combined with an adjustable aperture design, to achieve miniaturization, low distortion, high resolution, and low cost, and supports operation over a wide temperature range.
It achieves miniaturized, low-distortion, and high-resolution imaging effects, adapts to extreme temperatures and different lighting conditions, reduces production costs and maintenance difficulty, and improves the equipment's obstacle avoidance and environmental perception capabilities.
Smart Images
Figure CN223742850U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of imaging technology, specifically a miniaturized lens with a small target surface and a large angle for obstacle avoidance. Background Technology
[0002] With the rapid development of smart home devices, the demand for optical lenses in obstacle avoidance applications such as robotic vacuum cleaners is increasing. Current technologies for obstacle avoidance lenses typically require miniaturization, high resolution, low distortion, and low cost to accommodate the compact structure of smart devices and the price-sensitive nature of the consumer market. However, existing technologies still face the following challenges in practical applications:
[0003] Miniaturization and optical performance are difficult to balance: In pursuing miniaturization, existing lenses often struggle to maintain high resolution and low distortion optical performance. For example, some lenses achieve miniaturization by reducing the number of lenses or simplifying the structure, but this leads to increased aberrations (such as spherical aberration, field curvature, astigmatism, etc.), affecting image quality and failing to meet the high-precision environmental perception requirements in obstacle avoidance applications.
[0004] The trade-off between cost and performance: Existing lenses typically rely on complex multi-lens structures or high-precision glass materials to achieve high resolution and wide-angle imaging, resulting in high manufacturing costs that make it difficult to meet the low-cost requirements of consumer devices. Furthermore, some lenses employ special coatings or high-refractive-index materials to improve performance, but this further increases processing difficulty and cost.
[0005] Insufficient environmental adaptability: Existing lenses exhibit poor stability under extreme temperatures (e.g., -40℃ to +60℃) or varying lighting conditions, easily leading to image blurring or increased distortion, thus affecting the reliability of obstacle avoidance functions. Furthermore, some lenses lack adjustable aperture designs, hindering their flexibility in adapting to different lighting conditions and limiting their application scenarios.
[0006] The assembly and focusing processes are complex, increasing production costs and maintenance difficulty. Furthermore, some lenses are not securely fixed, which may lead to optical axis misalignment after prolonged use, affecting image quality. Utility Model Content
[0007] The purpose of this invention is to provide a miniaturized lens with a small target surface and a large angle for obstacle avoidance, featuring miniaturization, a small target surface, a large angle, high resolution, low distortion, and low cost.
[0008] To achieve the above objectives, this utility model provides the following technical solution:
[0009] A miniaturized lens for obstacle avoidance with a small target surface and a large angle includes a first lens, a second lens, and an aperture stop. The aperture stop is located between the first lens and the second lens. The first lens has a negative focal length, and the second lens has a positive focal length. Both the first lens and the second lens are concave lenses with even-order aspherical structures.
[0010] In a preferred embodiment, the first lens has an R1 radius of curvature of -11.93 to -12.08 mm, an R2 radius of curvature of 0.29 to 0.44, a thickness of 0.38 to 0.53 mm, a material refractive index of 1.524 to 1.593, and a dispersion coefficient of 55.946 to 55.996.
[0011] In a preferred embodiment, the radius of curvature of the second lens R1 is 532.93–533.08 mm, the radius of curvature of the second lens R2 is -0.35–-0.50, the thickness is 0.70–0.85 mm, the refractive index of the material is 1.524–1.623, and the dispersion coefficient is 28.946–31.956.
[0012] In a preferred embodiment, the miniaturized small-target-area, large-angle obstacle avoidance lens further includes a fixed housing. The fixed housing includes a first lens sleeve, a second lens sleeve, and an outer sleeve. The first lens is fixedly disposed inside the first lens sleeve, and the second lens is fixedly disposed inside the second lens sleeve. One of the first lens sleeve and the second lens sleeve is fixedly disposed at one end of the outer sleeve, and the other is disposed at the other end of the outer sleeve by a threaded connection.
[0013] In a preferred embodiment, the aperture is set inside the outer sleeve via an adjustment mechanism. The adjustment mechanism includes a fixed plate fixedly set inside the outer sleeve, the aperture being rotatably set on the fixed plate, the aperture having light-transmitting holes of different sizes, and an adjustment tooth being set on the outer side of the aperture. An adjustment gear is rotatably set on the outer sleeve, the adjustment gear meshing with the adjustment tooth, and one side of the adjustment gear passing through the outer sleeve and extending to the outer side of the outer sleeve.
[0014] In a preferred embodiment, the first lens and the second lens are made of plastic or glass.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] Excellent optical performance
[0017] Low distortion and high resolution: By combining even-order aspherical lenses (first lens with negative focal length and second lens with positive focal length) and optimizing the radius of curvature, aberrations such as spherical aberration, field curvature, and astigmatism are effectively corrected, achieving TV distortion of <18% while improving resolution and ensuring image clarity.
[0018] Wide-angle and large-angle imaging: The curvature radius design of the first lens supports wide-angle imaging, adapting to the wide-range environmental perception needs of smart devices (such as obstacle avoidance in robot vacuums).
[0019] High miniaturization and lightweight
[0020] Compact structure: The lens has a thin overall length (3.6-4.2mm) and is compatible with 1 / 13-inch small target surface chips, meeting the space constraints of smart devices.
[0021] Lightweight material selection: The use of plastic lenses (optional) significantly reduces weight and facilitates integration into portable devices.
[0022] Low cost and mass production advantages
[0023] Material and process optimization: Plastic materials reduce processing difficulty and cost, aspherical design reduces the number of lenses, and combined with threaded focusing structure, it simplifies the assembly process and is suitable for mass production.
[0024] Dual material compatibility: Offers both plastic (low cost) and glass (high precision) options to flexibly adapt to different market demands.
[0025] Environmental adaptability and stability
[0026] Wide operating temperature range: Supports extreme temperatures from -40℃ to +60℃, enhancing the device's durability in outdoor or complex environments.
[0027] Adjustable aperture design: Multiple light-transmitting holes combined with a rotating adjustment mechanism allow for quick adaptation to different lighting conditions (such as the 850nm infrared band), optimizing depth of field and image quality.
[0028] Structural reliability and maintainability
[0029] Modular housing design: The split sleeve (fixed lens sleeve + external sleeve) ensures optical axis alignment accuracy, and the threaded connection simplifies focusing and maintenance processes.
[0030] High stability: The lens sleeve fixing design ensures structural stability during long-term use and avoids displacement that may affect imaging.
[0031] Application scenario adaptability
[0032] Obstacle avoidance and perception optimization: Wide-angle, high-sensitivity imaging (850nm band) accurately identifies obstacles, improving the navigation efficiency of devices such as robot vacuums.
[0033] Consumer-grade device friendly: Its low cost and small size meet the needs of smart home products for cost-effectiveness and compact structure. Attached Figure Description
[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0035] Figure 1 This is a cross-sectional structural diagram of the present invention.
[0036] Figure 2 This is a three-dimensional structural diagram of the present invention.
[0037] Figure 3 This is a schematic diagram of the aperture and adjustment mechanism of this utility model.
[0038] Figure 4 This is a schematic diagram of the Mtf diagram of this utility model.
[0039] Figure 5 This is the focusing curve diagram of this utility model.
[0040] Figure 6 This is a relative illumination diagram of the present invention.
[0041] Figure reference numerals: 1-First lens, 2-Second lens, 3-Aperture, 4-Fixed housing, 5-Adjustment mechanism, 31-Light transmission hole, 41-First lens sleeve, 42-Second lens sleeve, 43-Outer sleeve, 51-Fixed piece, 52-Adjusting tooth, 53-Adjusting gear. Detailed Implementation
[0042] The following embodiments will be described in detail with reference to the accompanying drawings. In the drawings and description, similar or identical parts are referred to by the same reference numerals. Furthermore, in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this utility model are merely illustrative and not intended to limit the scope of the utility model. Any obvious modifications or alterations made to this utility model do not depart from its spirit and scope.
[0043] like Figures 1-6 As shown,
[0044] This invention provides a miniaturized lens with a small target surface and a large angle for obstacle avoidance, applicable to fields such as obstacle avoidance in intelligent sweeping robots. This lens is miniaturized, has a small target surface, and a large angle, featuring high resolution, low distortion, and low cost. The lens includes a first lens 1, a second lens 2, and an aperture stop 3, located between the first lens 1 and the second lens 2. The first lens 1 has a negative focal length, and the second lens 2 has a positive focal length; both are concave lenses with even-order aspherical structures. Through this structural design, the lens achieves miniaturization and low cost while maintaining high imaging quality.
[0045] Lens parameters and materials
[0046] The first lens 1 has a radius of curvature of R1 of -11.93 to -12.08 mm, a radius of curvature of R2 of 0.29 to 0.44, a thickness of 0.38 to 0.53 mm, a material refractive index of 1.524 to 1.593, and a dispersion coefficient of 55.946 to 55.996.
[0047] The second lens 2 has a radius of curvature of R1 of 532.93–533.08 mm, a radius of curvature of R2 of -0.35–-0.50, a thickness of 0.70–0.85 mm, a refractive index of 1.524–1.623, and a dispersion coefficient of 28.946–31.956. This further reduces chromatic aberration.
[0048] Lens parameter table
[0049] Face number Surface type radius of curvature Thickness / Distance Refractive index Dispersion coefficient S1 even aspherical surface -11.93～-12.08 0.38～0.53 1.524～1.593 55.946～55.996 S2 even aspherical surface 0.29～0.44 0.85～1.00 S3 even aspherical surface unlimited 0.02～0.17 S4 even aspherical surface 532.93～533.08 0.70～0.85 1.524～1.623 28.946～31.956 S5 even aspherical surface -0.35～-0.50 -0.06～0.09
[0050] Table of coefficients for secondary terms
[0051]
[0052] Lens material:
[0053] The first lens 1 and the second lens 2 are made of plastic. Plastic is lightweight and low-cost, suitable for mass production, and easy to process into aspherical structures. Glass offers superior optical performance, better high-temperature resistance and wear resistance, making it suitable for high-precision applications.
[0054] Fixed shell structure
[0055] Fixed outer casing 4:
[0056] The fixed housing 4 includes a first lens sleeve 41, a second lens sleeve 42, and an outer sleeve 43.
[0057] First lens sleeve 41: Used to fix the first lens 1, ensuring its positional accuracy and stability.
[0058] Second lens sleeve 42: used to fix the second lens 2 and ensure that it is aligned with the optical axis of the first lens 1.
[0059] Outer sleeve 43: used to accommodate the first lens sleeve 41 and the second lens sleeve 42, and to provide support for the overall structure.
[0060] Connection method: Of the first lens sleeve 41 and the second lens sleeve 42, one is fixedly mounted at one end of the outer sleeve 43, and the other is mounted at the other end of the outer sleeve 43 via a threaded connection. This design facilitates assembly and focusing while ensuring a compact structure.
[0061] Aperture and adjustment mechanism
[0062] Aperture stop 3: Aperture stop 3 is located between the first lens 1 and the second lens 2, and is used to control the amount of light entering the lens and adjust the depth of field and image quality.
[0063] The aperture 3 is provided with multiple light-transmitting holes 31 of different sizes. By rotating the aperture 3, different light-transmitting holes can be selected to adapt to different lighting conditions and imaging needs.
[0064] Adjustment mechanism 5: The adjustment mechanism 5 includes a fixed plate 51, an adjusting tooth 52 and an adjusting gear 53.
[0065] Fixing plate 51: It is fixedly installed on the inner side of the outer sleeve 43 to support the aperture 3.
[0066] Adjustment gear 52: Located on the outside of aperture 3, it meshes with adjustment gear 53.
[0067] Adjustment gear 53: Rotatably mounted on outer sleeve 43, with one side extending to the outside of outer sleeve 43, facilitating manual adjustment of the position of aperture 3 by the user.
[0068] Adjustment principle: By rotating the adjustment gear 53, the aperture 3 is rotated, thereby selecting different light-transmitting holes 31 to achieve rapid adjustment of the aperture.
[0069] Optical performance and advantages
[0070] Low distortion:
[0071] By using the curvature radius and aspherical design of the first lens 1 and the second lens 2, aberrations are effectively corrected, achieving TV distortion of less than 18%, thus meeting the high-precision imaging requirements in the obstacle avoidance field.
[0072] High resolution:
[0073] The lens employs a combination of even-order aspherical lenses to correct spherical aberration, coma, astigmatism, and field curvature, thereby improving the lens's resolving power and ensuring clear imaging.
[0074] Miniaturized design:
[0075] The total length of the lens is controlled between 3.6 and 4.2 mm to meet the needs of intelligent sweeping robots and other devices for miniaturized lenses.
[0076] low cost:
[0077] Made of plastic and featuring a simple threaded focusing structure, it reduces processing and assembly costs, making it suitable for mass production.
[0078] Application scenarios
[0079] This lens is designed for obstacle avoidance in applications such as intelligent robotic vacuum cleaners and is suitable for the following scenarios:
[0080] Obstacle avoidance function: Through wide-angle imaging and high resolution, it helps the device identify and avoid obstacles, and can be used in combination with other lenses.
[0081] Environmental perception: Achieve high-sensitivity imaging in the 850nm band and adapt to different lighting conditions.
[0082] Low-cost devices: suitable for cost-sensitive consumer smart devices.
[0083] Example parameters
[0084] Focal length: 0.21~0.42mm
[0085] Aperture: f / 2.0–f / 2.5
[0086] Overall length: 3.4~4.2mm
[0087] Operating temperature range: -40℃~+60℃
[0088] Band: 850±10nm
[0089] Distortion: TV distortion less than 18%
[0090] Image size: Compatible with 1 / 13-inch chips.
[0091] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0092] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A lens in the field of miniaturized small target large angle obstacle avoidance, characterized in that: From object plane to image plane successively include first lens (1), second lens (2) and diaphragm (3), the diaphragm (3) is located between first lens (1) and second lens (2), the first lens (1) is negative focal length, the second lens (2) is positive focal length, the first lens (1) and second lens (2) are all concave lens of even aspheric structure.
2. The lens of claim 1, wherein, The R1 curvature radius of the first lens (1) is-11.93~ -12.08mm, the R2 curvature radius is 0.29~0.44, the thickness is 0.38~0.53mm, the material refractive index is 1.524~1.593, and the dispersion coefficient is 55.946~55.
996.
3. The lens of claim 1, wherein, The R1 curvature radius of the second lens (2) is 532.93~533.08mm, the R2 curvature radius is-0.35~-0.50, the thickness is 0.70~0.85mm, the material refractive index is 1.524~1.623, and the dispersion coefficient is 28.946~31.
956.
4. The lens of claim 1, wherein, It also includes a fixed shell (4), the fixed shell (4) includes a first lens sleeve (41), a second lens sleeve (42) and an external sleeve (43), the first lens (1) is fixedly arranged in the first lens sleeve (41), the second lens (2) is fixedly arranged in the second lens sleeve (42), one of the first lens sleeve (41) and the second lens sleeve (42) is fixedly arranged at one end of the external sleeve (43), and the other is arranged at the other end of the external sleeve (43) through threaded connection.
5. The lens of claim 4, wherein, The diaphragm (3) is arranged on the inside of the external sleeve (43) through an adjusting mechanism (5), the adjusting mechanism (5) includes a fixed sheet (51) fixedly arranged on the inside of the external sleeve (43), the diaphragm (3) is rotatably arranged on the fixed sheet (51), the diaphragm (3) is provided with light transmission holes (31) of different sizes, the outside of the diaphragm (3) is provided with adjusting teeth (52), the external sleeve (43) is rotatably provided with an adjusting gear (53), the adjusting gear (53) is engaged with the adjusting teeth (52), and one side of the adjusting gear (53) extends to the outside of the external sleeve (43) through the external sleeve (43).
6. The lens of claim 1, wherein, The first lens (1) and the second lens (2) are made of plastic or glass.