Self-centering vehicle-mounted lens
The lens group and the cone surface of the lens barrel can achieve self-centering, which solves the problem of poor lens consistency and improves the imaging quality of the on-board lens and the stability of the ADAS system.
Patent Information
- Application Number
- CN202422162887.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-09-04
AI Technical Summary
Due to manufacturing errors, especially radial tolerances, existing vehicle-mounted lenses are difficult to ensure consistency between the lens and the lens, which affects the stability of the ADAS system.
The conical surface on the lens and the conical surface under the lens are used to cooperate with the conical surface in the lens barrel to achieve self-centering of the lens group, and the impact of radial gap on imaging performance is reduced through the conical surface connection, thereby improving the consistency of the lens.
Improves consistency between lenses, improves imaging quality and driving assistance system stability, and ensures clear details of imaging targets.
Smart Images
Figure CN223180474U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle-mounted lenses, in particular to a self-centering vehicle-mounted lens. Background Art
[0002] The installation rate of the automotive ADAS (Advanced Driver Assistance System) is growing rapidly. Looking at major manufacturers, these technologies are basically concentrated in L2-L3 level autonomous driving. In order to achieve these functions, in the single-vehicle perception system, various auxiliary devices on high-end vehicles can be equipped with up to 8 cameras, which are used to assist the driver in parking or trigger emergency braking.
[0003] In order to ensure the stability of the ADAS (Advanced Driver Assistance System), ADAS will automatically correct the differences between lenses to ensure the optimal imaging effect, but its correction amount is limited. Therefore, as an important component of the ADAS sensor, the consistency between lenses determines the stability of the ADAS performance. However, affected by manufacturing errors, especially the influence of radial tolerances, the consistency between lenses becomes uncontrollable. In order to improve the stability of the ADAS system, it is urgent to develop a self-centering vehicle-mounted lens that is not affected by radial clearances. Summary of the Utility Model
[0004] Aiming at the above problems, the purpose of the utility model is to provide a self-centering vehicle-mounted lens, which greatly improves the consistency of vehicle-mounted lenses.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0006] The utility model provides a self-centering vehicle-mounted lens, including a lens barrel and a lens group. The lens barrel forms an accommodation space for the lens group around the optical axis. The lens group includes multiple lenses, and spacer rings are arranged between the lenses; on the upper and lower sides of both ends of the lens that cooperate with the lens barrel and / or the spacer ring, a lens upper conical surface and a lens lower conical surface are respectively provided, and the lens is fixedly arranged in the accommodation space in the lens barrel through the lens upper conical surface and the lens lower conical surface.
[0007] Further preferably, the angle between the lens upper conical surface and the optical axis is equal to the angle between the lens lower conical surface and the optical axis.
[0008] Further preferably, on the upper and lower sides of both ends of the spacer ring, a spacer ring upper conical surface and a spacer ring lower conical surface that cooperate with the lens upper conical surface and the lens lower conical surface are respectively provided.
[0009] Further preferably, a rotary cap is provided at the object side end of the lens barrel, and the rotary cap locks the lens at the object side end of the lens group to the lens barrel; a first mating conical surface connected to the lens at the object side end of the lens group is provided on the rotary cap, and the first mating conical surface fits with the lens upper conical surface.
[0010] Further preferably, the lens barrel and the screw cap are connected by threads and fixed by glue.
[0011] Further preferably, the lens barrel is provided with a second matching conical surface connected to the lens located at the image side end of the lens group, and the second matching conical surface is in contact with the lower conical surface of the lens.
[0012] Further preferably, the included angle between the upper conical surface of the lens and the optical axis, and the included angle between the lower conical surface of the lens and the optical axis are both 10° to 80°.
[0013] Further preferably, the included angle between the upper conical surface of the lens and the optical axis, and the included angle between the lower conical surface of the lens and the optical axis are both 45°.
[0014] Further preferably, the included angle between the upper conical surface of the lens and the optical axis, and the included angle between the lower conical surface of the lens and the optical axis are both 60°.
[0015] Further preferably, the lens group includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, and the fifth lens is glued to the sixth lens; a first spacer is provided between the first lens and the second lens, a second spacer is provided between the second lens and the third lens, a third spacer is provided between the third lens and the fourth lens, a fourth spacer is provided between the fourth lens and the sixth lens, and a fifth spacer is provided between the sixth lens and the seventh lens; the upper conical surface of the first lens is in contact with the first mating conical surface of the screw cap; the lower conical surface of the seventh lens is in contact with the second mating conical surface of the lens barrel.
[0016] Compared with the prior art, the beneficial effects of the present invention are:
[0017] The connections between the lens group and other components of the utility model are all matched with conical surfaces, which realizes the self-centering of the lens group. It has a simple structure and high machinability. It reduces the requirements for the radial matching tolerance of the lens group, the spacer ring group and the lens barrel, reduces the influence of the radial clearance on the imaging performance of the vehicle-mounted lens, improves the consistency between the lenses, has excellent imaging quality, and has clear details of the imaging target, which can further enhance the stability of the driving assistance system. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0019] Figure 1 It is a cross-sectional structural diagram of an embodiment of the present utility model;
[0020] Figure 2It is the sectional view structure diagram of the spacer ring of the embodiment of the present utility model;
[0021] Figure 3 It is the sectional view structure diagram of the lens of the embodiment of the present utility model;
[0022] Figure 4 It is the sectional view structure diagram of the conical surface fit of the spacer ring and the lens of the embodiment of the present utility model;
[0023] Figure 5 It is the sectional view structure diagram of the lens barrel of the embodiment of the present utility model;
[0024] Figure 6 It is the sectional view structure diagram of the screw cap of the embodiment of the present utility model.
[0025] Figure 7 and Figure 8 They are the measured MTF curves of two batches of lenses of Embodiment 1 of the present utility model.
[0026] Illustration: G01, the first lens; G02, the second lens; G03, the third lens; G04, the fourth lens; G05, the fifth lens; G06, the sixth lens; G07, the seventh lens; S01, the first spacer ring; S02, the second spacer ring; S03, the third spacer ring; S04, the fourth spacer ring; S05, the fifth spacer ring; 01, the screw cap; 02, the waterproof ring; 03, the lens barrel; C01, the upper conical surface of the spacer ring; C02, the lower conical surface of the spacer ring; C03, the upper conical surface of the lens; C04, the lower conical surface of the lens; C05, the first mating conical surface; C06, the second mating conical surface.
[0027] The following specific embodiments will further illustrate the present utility model in conjunction with the above-mentioned drawings. Specific Embodiments
[0028] For a better understanding of the present utility model, more detailed descriptions will be made for various aspects of the present utility model with reference to the drawings. It should be understood that these detailed descriptions are only descriptions of the embodiments of the present utility model and do not limit the scope of the present utility model in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.
[0029] Those skilled in the art should understand that in the disclosure of this utility model, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation to this utility model.
[0030] It should also be understood that the terms "comprising", "comprising of", "having", "containing" and / or "containing of", when used in this specification, mean the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of this utility model, the use of "may" means "one or more embodiments of this utility model". And the term "exemplary" is intended to refer to an example or illustration.
[0031] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those of ordinary skill in the art to which this utility model belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless clearly defined herein.
[0032] It should be noted that, without conflict, the embodiments in this utility model and the features in the embodiments can be combined with each other. The following will detail this utility model with reference to the drawings and in combination with the embodiments.
[0033] As Figures 1-6 shown, this utility model provides a self - centering vehicle - mounted lens, which includes a lens barrel 03 and a lens group. The lens barrel 03 forms a receiving space for the lens group around the optical axis. The lens group includes multiple lenses, and spacer rings are provided between the lenses; on the upper and lower sides at both ends of the lens in cooperation with the lens barrel 03 and / or the spacer ring, there are respectively a lens upper cone surface C03 and a lens lower cone surface C04. The lens is fixedly arranged in the receiving space within the lens barrel 03 through the lens upper cone surface C03 and the lens lower cone surface C04. The angle between the lens upper cone surface C03 and the optical axis is equal to the angle between the lens lower cone surface C04 and the optical axis.
[0034] On the upper and lower sides of both ends of the spacer ring, there are respectively provided a spacer ring upper conical surface C01 and a spacer ring lower conical surface C02 that cooperate with the lens upper conical surface C03 and the lens lower conical surface C04.
[0035] At the object side end of the lens barrel 03, there is provided a screw cap 01. The screw cap 01 locks the lens at the object side end of the lens group on the lens barrel 03. The lens barrel 03 and the screw cap 01 are connected by threads and fixed by dotting. On the screw cap 01, there is provided a first mating conical surface C05 that connects to the lens at the object side end of the lens group, and the first mating conical surface C05 fits with the lens upper conical surface C03.
[0036] On the lens barrel 03, there is provided a second mating conical surface C06 that connects to the lens at the image side end of the lens group, and the second mating conical surface C06 fits with the lens lower conical surface C04.
[0037] It can be understood that the connections between the lens group and other components all adopt conical surface fits, making the center line of the lens as close as possible to the optical axis, achieving self - centering of the lens group. The structure is simple, the processability is high, the requirements for the radial fit tolerances of the lens group, the spacer ring group, and the lens barrel 03 are reduced, the influence of the radial clearance on the imaging performance of the vehicle - mounted lens is reduced, and the consistency between lenses is improved.
[0038] The angles between the lens upper conical surface C03 and the optical axis, and between the lens lower conical surface C04 and the optical axis are both 10° - 80°. More specifically, the angles between the lens upper conical surface C03 and the optical axis, and between the lens lower conical surface C04 and the optical axis can both be 45° or 60°.
[0039] More specifically, the lens group includes, in sequence from the object side to the image side, a first lens G01, a second lens G02, a third lens G03, a fourth lens G04, a fifth lens G05, a sixth lens G06, and a seventh lens G07. The fifth lens G05 is glued to the sixth lens G06. There is a first spacer ring S01 between the first lens G01 and the second lens G02, a second spacer ring S02 between the second lens G02 and the third lens G03, a third spacer ring S03 between the third lens G03 and the fourth lens G04, a fourth spacer ring S04 between the fourth lens G04 and the sixth lens G06, and a fifth spacer ring S05 between the sixth lens G06 and the seventh lens G07. The above - mentioned lenses and the above - mentioned spacer rings are all in conical surface fit. The lens upper conical surface C03 of the first lens G01 fits with the first mating conical surface C05 of the screw cap 01; the lens lower conical surface C04 of the seventh lens G07 fits with the second mating conical surface C06 of the lens barrel 03. In addition, there is a waterproof ring 02 between the first lens G01 and the lens barrel 03 to prevent external dust and water from entering the inside of the lens barrel.
[0040] Embodiment 1
[0041] In this embodiment, the angles between the upper conical surface of the lens and the optical axis, and between the lower conical surface of the lens and the optical axis are both 60°.
[0042] The first lens G01 satisfies the relationship: Nd≥1.88, Vd≤39.3; the second lens G02 satisfies the relationship: Nd≥1.72, Vd≥43.6; the third lens G03 satisfies the relationship: Nd≥1.90, Vd≤31.4; the fourth lens G04 satisfies the relationship: Nd≥1.61, Vd≤63.5; the fifth lens G05 satisfies the relationship: Nd≥1.59, Vd≥68.3; the sixth lens G06 satisfies the relationship: Nd≥1.92, Vd≥18.8; the seventh lens G07 satisfies the relationship: Nd≥1.80, Vd≤41.0; where Nd is the refractive index and Vd is the Abbe number.
[0043] The focal length of the optical system is f, and the focal lengths of the first lens G01, the second lens G02, the third lens G03, the fourth lens G04, the fifth lens G05, the sixth lens G06, and the seventh lens G07 are f1, f2, f3, f4, f5, f6, and f7 respectively. Among them, f1, f2, f3, f4, f5, f6, and f7 satisfy the following ratios with f: -2 < f1 / f < -1, -14 < f2 / f < -10, 2 < f3 / f < 4, 3 < f4 / f < 5, 2 < f5 / f < 4, -2 < f6 / f < 0, 1 < f7 / f < 3.
[0044] As Figure 7 and Figure 8 shown, MTF1 and MTF2 are measured for two batches of lenses. Among them, L1 and L2 are the MTF values in the horizontal and vertical directions of the lenses respectively. The MTF differences in the horizontal and vertical directions of the two batches of lenses are small, that is, the line segment coincidence degree is high, indicating that the MTF differences between the lenses in Embodiment 1 are small, the consistency is good, the imaging quality is excellent, the imaging target details are clear, and the stability of the driving assistance system can be further improved.
[0045] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.
Claims
1. A self-centering vehicle-mounted lens, characterized in that, It includes a lens barrel (03) and a lens group. The lens barrel (03) forms an accommodation space for the lens group around the optical axis. The lens group includes multiple lenses, and spacers are provided between the lenses; on the upper and lower sides of both ends of the lens that cooperate with the lens barrel (03) and / or the spacer, a lens upper conical surface (C03) and a lens lower conical surface (C04) are respectively provided, and the lens is fixedly arranged in the accommodation space within the lens barrel (03) through the lens upper conical surface (C03) and the lens lower conical surface (C04).
2. The self-centering vehicle-mounted lens according to claim 1, wherein The angle between the lens upper conical surface (C03) and the optical axis is equal to the angle between the lens lower conical surface (C04) and the optical axis.
3. The self-centering vehicle-mounted lens according to claim 2, characterized in that, On the upper and lower sides of both ends of the spacer, a spacer upper conical surface (C01) and a spacer lower conical surface (C02) that cooperate with the lens upper conical surface (C03) and the lens lower conical surface (C04) are respectively provided.
4. The self-centering vehicle-mounted lens according to claim 3, wherein, A rotary cap (01) is provided at the object side end of the lens barrel (03), and the rotary cap (01) locks the lens at the object side end of the lens group to the lens barrel (03); a first mating conical surface (C05) connected to the lens at the object side end of the lens group is provided on the rotary cap (01), and the first mating conical surface (C05) fits with the lens upper conical surface (C03).
5. The self-centering vehicle-mounted lens according to claim 4, wherein The lens barrel (03) and the rotary cap (01) are connected by threads and fixed by dotting glue.
6. The self - centering vehicle - mounted lens according to claim 4, wherein A second mating conical surface (C06) connected to the lens at the image side end of the lens group is provided on the lens barrel (03), and the second mating conical surface (C06) fits with the lens lower conical surface (C04).
7. The self-centering vehicle-mounted lens according to claim 6, wherein, The angle between the lens upper conical surface (C03) and the optical axis and the angle between the lens lower conical surface (C04) and the optical axis are both 10° to 80°.
8. The self-centering vehicle-mounted lens according to claim 7, wherein, The angle between the lens upper conical surface (C03) and the optical axis and the angle between the lens lower conical surface (C04) and the optical axis are both 45°.
9. The self-centering vehicle-mounted lens according to claim 7, wherein The angle between the lens upper conical surface (C03) and the optical axis and the angle between the lens lower conical surface (C04) and the optical axis are both 60°.
10. A self-centering vehicle-mounted lens according to claim 7, characterized in that, The lens group sequentially includes a first lens (G01), a second lens (G02), a third lens (G03), a fourth lens (G04), a fifth lens (G05), a sixth lens (G06), and a seventh lens (G07) from the object side to the image side. The fifth lens (G05) is glued to the sixth lens (G06). A first spacer (S01) is provided between the first lens (G01) and the second lens (G02), a second spacer (S02) is provided between the second lens (G02) and the third lens (G03), a third spacer (S03) is provided between the third lens (G03) and the fourth lens (G04), a fourth spacer (S04) is provided between the fourth lens (G04) and the sixth lens (G06), and a fifth spacer (S05) is provided between the sixth lens (G06) and the seventh lens (G07). The upper conical surface (C03) of the first lens (G01) is in contact with the first mating conical surface (C05) of the screw cap (01). The lower conical surface (C04) of the seventh lens (G07) is in contact with the second mating conical surface (C06) of the lens barrel (03).