All-weather gated large-aperture lens

By designing multi-lens combination and optimizing optical parameters, the aperture, large field of view and miniaturization of all-weather gated large aperture lenses is achieved, which solves the problem of difficult imaging of autonomous driving systems in low-light environments at night, and meets the automatic driving system imaging requirements and maintain stable performance in high and low temperature environments.

CN222232762UActive Publication Date: 2024-12-24KUNSHAN STARSHIP INTELLIGENT TECH CO LTD
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Patent Information

Application Number
CN202420874637.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-25
Publication Date
2024-12-24
Estimated Expiration
2034-04-25

AI Technical Summary

Technical Problem

Existing optical lenses cannot effectively image in low light, haze, rain and glare environments at night in autonomous driving imaging perception. The conventional lenses have small aperture, small field of view angle and large volume, which cannot meet the needs of autonomous driving systems. .

Method used

A full-weather gated large aperture lens is designed. By setting multiple lenses and filters, the effective focal length, optical total length and aperture value are optimized to achieve a large aperture, large field of view and miniaturized lens structure, using glass lenses and The metal frame combination is combined with narrowband filters and spacers to meet the imaging requirements of the autonomous driving system.

Benefits of technology

It realizes clear imaging in all-weather environments, meeting the optical lens needs of the autonomous driving system. The lens structure is simple and reasonable, suitable for large-scale production, and maintains stable high-definition image quality in high and low temperature environments.

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Abstract

The utility model discloses an all-weather gated large-aperture lens, which comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged and meet the following relational expressions: 1.0 < = EFL1 / EFL < = 3.0; eFL2 / EFL is greater than or equal to 1.1 and less than or equal to 3.3; eFL 34 / EFL is greater than or equal to 1.0 and less than or equal to 2.8; 0.8 < = EFL5 / EFL < = 2.0; 0.4 < = EFL / TTL < = 0.7; 1.1 < = F < = 1.4; eFL, TTL and F are the effective focal length, the total optical length and the aperture value of the large-aperture lens respectively; the EFL1, the EFL2 and the EFL5 are the effective focal lengths of the first lens, the second lens and the fifth lens respectively, and the EFL34 is the effective focal length of a balsaming lens formed by the third lens and the fourth lens. The large-aperture lens has the advantages of large aperture, large field angle, large camera target surface, small size and the like, and meets the special requirements of all-weather gated imaging technology and automatic driving on optical lenses.
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Description

Technical Field

[0001] The utility model relates to the technical field of optical lenses, in particular to an all-weather gated large aperture lens. Background Art

[0002] Autonomous driving includes perception, judgment and execution, and perception is an important module of the autonomous driving system. Currently, visible light imaging technology is mainly used in the field of autonomous driving imaging perception, but visible light imaging technology cannot effectively image in low light at night, fog (haze), rain and glare environments, so it is not enough to use its imaging in all-weather environments for artificial intelligence recognition.

[0003] The range-gated imaging technology based on gating technology belongs to the active imaging mode, which uses the laser to emit laser pulses to illuminate the target. During the transmission of the laser pulse, when part of the laser energy is scattered by the scattering medium and reflected back by the intermediate scene, the receiver's gate is closed, thereby rejecting atmospheric backscattering and background clutter; and when the laser signal reflected back from the target area reaches the receiver, the system gate is opened to image the target area, and then the gate is closed again. The range-gated imaging technology based on gating technology can achieve effective imaging in low light, fog (haze), rain and glare at night, thereby achieving all-weather imaging.

[0004] In addition, it can be seen from the above that the optical lens assembly is an important component of the range-gated imaging system, and the conventional lens has the following characteristics: the aperture is small, which cannot meet the requirements of obtaining sufficient light flux in an extremely short exposure time; the camera target surface is small, which cannot meet the requirements of a higher resolution; the size is large, which cannot meet the needs of miniaturization. Therefore, how to improve the optical lens assembly in the range-gated imaging system so that the range-gated imaging system can better meet the requirements of autonomous driving and can be adapted for use in the field of autonomous driving has become a technical problem that urgently needs to be solved.

[0005] In view of this, the present utility model is proposed. Summary of the invention

[0006] In order to overcome the above-mentioned defects, the utility model provides an all-weather gated large aperture lens, which has the advantages of simple and reasonable structure, large aperture, large field of view, large camera target surface, and miniaturized size. It can well meet the special requirements of all-weather gated imaging technology for optical lenses and meet the use requirements of autonomous driving.

[0007] The technical solution adopted by the utility model to solve the technical problem is: an all-weather gated large aperture lens, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side, and satisfying the following relationship:

[0008] 1.0≤|EFL1 / EFL|≤3.0;

[0009] 1.1≤|EFL2 / EFL|≤3.3;

[0010] 1.0≤|EFL34 / EFL|≤2.8;

[0011] 0.8≤|EFL5 / EFL|≤2.0;

[0012] 0.4≤EFL / TTL≤0.7;

[0013] 1.1≤F≤1.4;

[0014] Among them, EFL is the effective focal length of the large aperture lens, TTL is the total optical length of the large aperture lens, and F is the aperture value of the large aperture lens; EFL1 is the effective focal length of the first lens, EFL2 is the effective focal length of the second lens, EFL34 is the effective focal length of the cemented lens composed of the third lens and the fourth lens, and EFL5 is the effective focal length of the fifth lens.

[0015] As a further improvement of the present invention, the first lens is a glass lens with positive optical power, and the object side surface of the first lens is a convex surface and the image side surface is a flat surface;

[0016] The second lens is a glass lens with negative optical power, and the object side surface of the second lens is convex and the image side surface is concave;

[0017] The third lens is a glass lens with negative optical power, and the object side surface of the third lens is a concave surface and the image side surface is a flat surface;

[0018] The fourth lens is a glass lens with positive refractive power, and the object side surface of the fourth lens is a flat surface and the image side surface is a convex surface;

[0019] The fifth lens is a glass lens with positive refractive power, and the object side surface of the fifth lens is a convex surface and the image side surface is a flat surface.

[0020] As a further improvement of the present invention, a filter is arranged beside the image side surface of the fifth lens.

[0021] As a further improvement of the present invention, the filter is a narrow-band filter that only allows light with a wavelength of 808nm±10nm to pass through.

[0022] As a further improvement of the present invention, a lens frame and a pressure ring both made of metal material are provided, the lens frame is used to accommodate the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the filter; the pressure ring is arranged at the object side end of the lens frame to stop and limit the first lens.

[0023] As a further improvement of the present invention, the pressing ring is threadedly sleeved on the object side end of the lens frame.

[0024] As a further improvement of the present invention, spacers made of metal material are respectively arranged between the first lens and the second lens, between the second lens and the third lens, and between the fourth lens and the fifth lens.

[0025] As a further improvement of the present invention, the effective focal length EFL and the total optical length TTL of the large aperture lens also satisfy the following relationship: 10mm≤EFL≤20mm; 20mm≤TTL≤30mm.

[0026] As a further improvement of the present invention, the field of view angle 2w of the large aperture lens is ≥30°.

[0027] The beneficial effects of the utility model are as follows: ① The utility model realizes the optimal control of the EFL / TTL value of the lens between 0.4 and 0.7, and the optimal control of the aperture value F of the lens between 1.1 and 1.4 by reasonably setting and combining the layout and focal length of the lens, that is, the lens has the advantages of large aperture, large field of view, large camera target surface, and small size, so as to well meet the special requirements of all-weather gated imaging technology for optical lenses and meet the requirements of autonomous driving. ② The overall structure of the lens described in the utility model is simple and reasonable, easy to process and assemble, and more suitable for large-scale and high-yield production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic cross-sectional structure diagram of the all-weather gated large aperture lens of the utility model;

[0029] Figure 2 It is an isometric structural schematic diagram of the all-weather gated large aperture lens of the utility model.

[0030] Combined with the accompanying drawings, the following description is given:

[0031] 1. First lens; 2. Second lens; 3. Third lens; 4. Fourth lens;

[0032] 5. Fifth lens; 6. Filter; 7. Frame; 8. Pressure ring; 9. Spacer. DETAILED DESCRIPTION

[0033] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] Embodiment 1:

[0035] This embodiment 1 provides an all-weather gated large aperture lens, which can meet the special requirements of all-weather gated imaging technology for optical lenses (such as large aperture, large field of view, etc.), and can be well applied to the field of autonomous driving.

[0036] Please see attached Figure 1 and attached Figure 2 As shown, the all-weather gated large aperture lens provided in this embodiment 1 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4 and a fifth lens 5 which are arranged in sequence from the object side to the image side, and satisfy the following relationship:

[0037] 1.0≤|EFL1 / EFL|≤3.0;

[0038] 1.1≤|EFL2 / EFL|≤3.3;

[0039] 1.0≤|EFL34 / EFL|≤2.8;

[0040] 0.8≤|EFL5 / EFL|≤2.0;

[0041] 0.4≤EFL / TTL≤0.7;

[0042] 1.1≤F≤1.4;

[0043] Among them, EFL is the effective focal length of the large aperture lens, TTL is the total optical length of the large aperture lens, and F is the aperture value of the large aperture lens; EFL1 is the effective focal length of the first lens 1, EFL2 is the effective focal length of the second lens 2, EFL34 is the effective focal length of the cemented lens composed of the third lens 3 and the fourth lens 4, and EFL5 is the effective focal length of the fifth lens 5.

[0044] As we all know, the larger the EFL / TTL value in the optical system, the longer the effective focal length of the lens, the smaller the viewing angle and depth of field that can be captured, and the longer the length of the entire optical system; and the smaller the EFL / TTL value in the optical system, the shorter the effective focal length of the lens, the larger the viewing angle and depth of field that can be captured, and the shorter the length of the entire optical system. The present application achieves optimal control of the EFL / TTL value of the lens between 0.4 and 0.7 (wherein the effective focal length EFL of the lens can be further optimized to: 10mm≤EFL≤20mm; the total optical length TTL of the lens can be further optimized to: 20mm≤TTL≤30mm), and the aperture value F of the lens is optimized to be between 1.1 and 1.4, that is, the lens has the advantages of large aperture, large field of view (the field of view of the lens 2w≥30°), large camera target surface (related to the field of view), and miniaturization (reduced total length of the lens), so as to achieve clear imaging even in low light, which well meets the special requirements of all-weather gated imaging technology for optical lenses and meets the use requirements of autonomous driving.

[0045] The specific structure of the all-weather gated large aperture lens described in this embodiment 1 is described in detail below.

[0046] First, please refer to the attached Figure 1 As shown, this embodiment 1 also optimizes the selection of materials and surface shapes of the lenses, which is manifested in that: the first lens 1 is a glass lens with positive focal power, and the object side surface of the first lens 1 is a convex surface, and the image side surface is a plane; the second lens 2 is a glass lens with negative focal power, and the object side surface of the second lens 2 is a convex surface, and the image side surface is a concave surface; the third lens 3 is a glass lens with negative focal power, and the object side surface of the third lens 3 is a concave surface, and the image side surface is a plane; the fourth lens 4 is a glass lens with positive focal power, and the object side surface of the fourth lens 4 is a plane, and the image side surface is a convex surface; the fifth lens 5 is a glass lens with positive focal power, and the object side surface of the fifth lens 5 is a convex surface, and the image side surface is a plane. It can be understood that: ① by adopting glass lenses, it can have higher stability and can adapt to harsh environments; ② by optimizing the surface shape of the above-mentioned lenses, the EFL / TTL value and aperture value F of the lens can be further optimized within the above-mentioned preferred range, so that the lens can better meet the special requirements of all-weather gated imaging technology for optical lenses.

[0047] Next, please refer to the attached Figure 1As shown, in this embodiment 1, a filter 6 is further provided beside the image side surface of the fifth lens 5, and the filter 6 is a narrow-band filter that only allows light with a wavelength of 808nm±10nm to pass through. Further, the narrow-band filter has a transmittance greater than 90% for light with a wavelength of (808±10)nm (infrared light), but can be close to 100% cutoff for light in other wavelength bands, thereby effectively filtering out stray light in non-working wavelength bands to reduce optical noise and better improve imaging quality.

[0048] Next, please refer to the attached Figure 1 As shown, this embodiment 1 is also provided with a frame 7 and a pressing ring 8 both made of metal materials, the frame 7 is used to accommodate the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5 and the filter 6; the pressing ring 8 is arranged at the object side end of the frame 7 to stop and limit the first lens 1. This embodiment 1 preferably uses a glass lens and a metal frame combination, because the deformation of the glass lens and the metal frame in high and low temperature environments is close, so that the temperature drift of the lens can be stable, and it is not easy to lose focus in high and low temperature environments, so that it can well meet the working temperature requirements of -40℃~105℃ of automotive regulations, and realize that the lens defocus is less than 2um in high and low temperature environments, maintaining stable high-definition image quality. That is: this embodiment uses a glass lens and a metal frame combination to make the lens have stable focusing characteristics and thermal compensation characteristics, and can work stably at a working temperature of -40℃~105℃ without losing focus.

[0049] Furthermore, the present embodiment 1 also controls the connection mode between the pressing ring 8 and the lens frame 7, and preferably adopts: the pressing ring 8 is threadedly sleeved on the object side end of the lens frame 7, that is, the inner wall of the pressing ring 8 is formed with an internal thread section, and the outer wall of the object side end of the lens frame 7 is formed with an external thread section that matches the internal thread section. By adopting the above connection mode between the pressing ring and the lens frame, the pressing ring does not occupy the internal space of the lens frame, so that the axial length of the lens frame can be shortened, and of course the radial size of the lens frame is also reduced, so that the overall structure of the lens is more compact, meeting the use requirements of miniaturization of the lens.

[0050] Next, please refer to the attached Figure 1 As shown, in this embodiment 1, a spacer 9 made of metal material is provided between the first lens 1 and the second lens 2, between the second lens 2 and the third lens 3, and between the fourth lens 4 and the fifth lens 5, so as to separate and fix the above lenses. In addition, because the metal material used by the spacer 9 is the same as that of the lens frame 7, the deformation amount under high and low temperature environments is close, which can further stabilize the temperature drift of the lens and maintain stable high-definition image quality.

[0051] In addition, in the lens structure described in the present embodiment 1, the image side end of the lens is designed as an AA interface structure (AA means "Active Alignment"). The AA interface is a technology for determining the relative position of parts during assembly, that is, the lens can achieve automatic focusing by using this technology, and no other structure needs to be designed on the outer wall of the image side end of the lens, which is a smooth cylindrical surface. Compared with the design of the lens threaded interface, the AA interface can avoid the difficulty of interface torque control and the problem of dust falling during the focusing process, which is beneficial to the lens focusing.

[0052] To sum up, the all-weather gated large aperture lens described in the utility model has the advantages of simple and reasonable structure, large aperture, large field of view, large camera target surface, and compact size. It can well meet the special requirements of all-weather gated imaging technology for optical lenses and meet the use requirements of autonomous driving.

[0053] In the above description, many specific details are described to facilitate a full understanding of the present invention. However, the above description is only a preferred embodiment of the present invention. The present invention can be implemented in many other ways different from those described herein, so the present invention is not limited by the specific implementation disclosed above. At the same time, any person familiar with the technical field can make many possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention, or modify it into an equivalent embodiment of equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. An all-weather gated large aperture lens, characterized by: The invention comprises a first lens (1), a second lens (2), a third lens (3), a fourth lens (4) and a fifth lens (5) which are arranged in sequence from the object side to the image side and satisfy the following relationship: 1.0≤|EFL1 / EFL|≤3.0; 1.1≤|EFL2 / EFL|≤3.3; 1.0≤|EFL34 / EFL|≤2.8; 0.8≤|EFL5 / EFL|≤2.0; 0.4≤EFL / TTL≤0.7; 1.1≤F≤1.4； Wherein, EFL is the effective focal length of the large aperture lens, TTL is the total optical length of the large aperture lens, and F is the aperture value of the large aperture lens; EFL1 is the effective focal length of the first lens (1), EFL2 is the effective focal length of the second lens (2), EFL34 is the effective focal length of the cemented lens composed of the third lens (3) and the fourth lens (4), and EFL5 is the effective focal length of the fifth lens (5).

2. The all-weather gated large aperture lens according to claim 1, characterized in that: The first lens (1) is a glass lens with positive optical power, and the object side surface of the first lens (1) is a convex surface and the image side surface is a flat surface; The second lens (2) is a glass lens with negative optical power, and the object side surface of the second lens (2) is a convex surface and the image side surface is a concave surface; The third lens (3) is a glass lens with negative optical power, and the object side surface of the third lens (3) is a concave surface and the image side surface is a flat surface; The fourth lens (4) is a glass lens with positive optical power, and the object side surface of the fourth lens (4) is a flat surface and the image side surface is a convex surface; The fifth lens (5) is a glass lens with positive optical power, and the object side surface of the fifth lens (5) is a convex surface and the image side surface is a flat surface.

3. The all-weather gated large aperture lens according to claim 1, characterized in that: A filter (6) is arranged next to the image side surface of the fifth lens (5).

4. The all-weather gated large aperture lens according to claim 3, characterized in that: The optical filter (6) is a narrow-band filter that only allows light with a wavelength of 808 nm ± 10 nm to pass through.

5. The all-weather gated large aperture lens according to claim 3, characterized in that: A lens frame (7) and a pressure ring (8) both made of metal materials are also provided. The lens frame (7) is used to accommodate the first lens (1), the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5) and the filter (6); the pressure ring (8) is arranged at the object side end of the lens frame (7) to stop and limit the first lens (1).

6. The all-weather gated large aperture lens according to claim 5, characterized in that: The pressing ring (8) is threadedly sleeved on the object side end of the lens frame (7).

7. The all-weather gated large aperture lens according to claim 5, characterized in that: Spacers (9) made of metal material are respectively arranged between the first lens (1) and the second lens (2), between the second lens (2) and the third lens (3), and between the fourth lens (4) and the fifth lens (5).

8. The all-weather gated large aperture lens according to claim 1, characterized in that: The effective focal length EFL and the total optical length TTL of the large aperture lens also satisfy the following relationship: 10mm≤EFL≤20mm; 20mm≤TTL≤30mm.

9. The all-weather gated large aperture lens according to claim 1, characterized in that: The field of view angle 2w of the large aperture lens is ≥30°.