Low-temperature drift vehicle-mounted lens

Abstract

The utility model provides a low temperature drift vehicle-mounted lens, which comprises a lens barrel and a lens group arranged in the lens barrel, the lens group comprises a plurality of lenses, the peripheral side of at least one lens of the lens group is an arc-shaped surface, the arc-shaped surface abuts against the lens barrel, and waterproof rings are arranged among the lenses. The lens structure provided by the utility model has the advantages of simple structure, high machinability, capability of realizing low focus drift in a temperature range of-40 DEG C to 105 DEG C, stable working imaging of an optical system, excellent imaging quality and clear details of an imaging target, meets the working requirement of a wide temperature range of a vehicle gauge level vehicle-mounted lens, and can further improve the stability of a driving auxiliary system.

Description

Technical Field

[0001] The utility model relates to the technical field of imaging lenses, in particular to a low-temperature drift vehicle-mounted lens. Background Art

[0002] The installation rate of ADAS advanced driver assistance systems is growing rapidly. Looking at major manufacturers, these technologies are basically concentrated on L2-L3 autonomous driving. In order to achieve these functions, in the single-vehicle perception system, various auxiliary equipment of high-end cars can be equipped with up to 8 cameras to assist the driver in parking or triggering emergency braking.

[0003] As an important component of ADAS (Advanced Driver Assistance System) sensors, automotive lenses will encounter various extreme environments during use, such as: ultra-high temperatures caused by exposure to the sun in summer, ultra-low temperatures of dozens of degrees below zero in the north in winter, and damage caused by rainy days and high-pressure car washing. "Automotive-grade" automotive lenses are required to work normally within the range of -40℃ to 105℃, but drastic temperature changes will cause the focus of the automotive lens to drift and the image quality to deteriorate. In order to improve the adaptability and comprehensive performance of the ADAS system, it is urgent to develop a low-temperature drift automotive lens that can work stably within the range of -40℃ to 105℃. Utility Model Content

[0004] In view of the above problems, the purpose of the utility model is to provide a low-temperature drift vehicle-mounted lens, which greatly improves the temperature adaptability of the vehicle-mounted lens.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] The utility model provides a low-temperature drift vehicle-mounted lens, comprising a lens barrel and a lens group arranged in the lens barrel, the lens group comprising a plurality of lenses, and the outer peripheral side of at least one lens of the lens group is an arc surface, the arc surface abuts against the lens barrel, and a waterproof ring is arranged between the lenses.

[0007] Further preferably, the lens includes an optical portion and a mounting portion, the mounting portion is arranged around the optical portion, and the thickness of the mounting portion along the optical axis direction is smaller than the thickness of the optical portion, and the arc surface is arranged on the outer peripheral side of the mounting portion.

[0008] Further preferably, the mounting portion includes a plurality of mounting portions, and the plurality of mounting portions are arranged at intervals around the optical portion.

[0009] Further preferably, the lens group includes six lenses, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in sequence from the object side end to the image side end along the optical axis, and the waterproof ring includes a first waterproof ring, which is arranged between the first lens and the second lens.

[0010] Further preferably, the low-temperature drift vehicle-mounted lens also includes a locking ring and a filter, the locking ring is arranged at the image side end of the sixth lens, and the locking ring presses the sixth lens toward the object side end in the lens barrel, and the filter is fixed on the side of the locking ring away from the sixth lens by glue.

[0011] Further preferably, the fourth lens and the fifth lens are bonded by adhesive to form a cemented lens, and a second spacer is provided between the third lens and the fifth lens.

[0012] Further preferably, the second spacer includes a first shielding portion and a second shielding portion, the first shielding portion is arranged at the image side end of the third lens, and the second shielding portion is arranged at the object side end of the fourth lens.

[0013] Further preferably, a first spacer is provided between the fifth lens and the sixth lens, and the waterproof ring further includes a second waterproof ring, and the second waterproof ring is provided between the first spacer and the sixth lens.

[0014] Further preferably, the first lens has positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has negative optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is concave; the third lens has positive optical power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the fourth lens has positive optical power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has negative optical power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the sixth lens has negative optical power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex.

[0015] Further preferably, the total focal length of the lens group is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are f1, f2, f3, f4, f5, f6 respectively, wherein f1, f2, f3, f4, f5, f6 and f satisfy the following range: <f1 / f<2,-1<f2 / f<0,1<f3 / f<2,0<f4 / f<1,-3<f5 / f<-2,-1<f6 / f<0。

[0016] Further preferably, the lens barrel is connected to the locking ring via threads; the lens barrel is a metal lens barrel, and the first spacer and the second spacer are both metal spacers.

[0017] The beneficial effects of the utility model are:

[0018] The lens structure provided by the utility model has a simple structure and high machinability, can achieve low focus drift in the temperature range of -40°C to 105°C, the optical system can work stably for imaging, the imaging quality is excellent, and the imaging target details are clear, meeting the working requirements of automotive-grade vehicle-mounted lenses in a wide temperature range, and can further improve the stability of the driving assistance system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 It is a cross-sectional view of the lens in the utility model;

[0022] Figure 3 It is a top view of the lens in the utility model;

[0023] Figure 4 It is a structural schematic diagram of the second spacer in the utility model;

[0024] Illustrations: 1-lens barrel, 2-first waterproof ring, 3-arc surface, 4-second spacer, 401-first blocking part, 402-second blocking part, 5-first spacer, 6-second waterproof ring, 7-locking ring, 8-filter, 9-mounting part, 10-optical part, G01-first lens, G02-second lens, G03-third lens, G04-fourth lens, G05-fifth lens, G06-sixth lens, A-object side end, B-image side end.

[0025] The following specific implementation manner will further illustrate the present utility model in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0026] In order to better understand the utility model, a more detailed description of various aspects of the utility model will be made with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of embodiments of the utility model, and do not limit the scope of the utility model in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0027] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 understood as limiting the present invention.

[0028] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate 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 expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present invention, "may" is used to mean "one or more embodiments of the present invention". And, the term "exemplary" is intended to refer to an example or illustration.

[0029] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which the utility model belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] like Figures 1 to 4 As shown, a low temperature drift vehicle-mounted lens comprises a lens barrel 1 and a lens group arranged in the lens barrel 1, wherein the lens group comprises a plurality of lenses, and the outer peripheral side of at least one lens of the lens group is an arc surface 3, and the arc surface 3 abuts against the lens barrel 1. A waterproof ring is arranged between the lenses.

[0032] The lens comprises an optical part 10 and a mounting part 9, wherein the mounting part 9 is arranged around the optical part 10, and the thickness of the mounting part 9 along the optical axis direction is less than the thickness of the optical part 10, and the arc surface 3 is arranged on the outer peripheral side of the mounting part 9. The arrangement of the mounting part 9 can reduce the contact area between the lens and the lens barrel 1, and can ensure that the lens is uniformly stressed inside the lens barrel 1, effectively alleviate the temperature drift, and improve the imaging quality. At the same time, by setting the outer peripheral side of the lens to the arc surface 3, the contact area between the lens and the lens barrel 1 is reduced, and the lens can be effectively alleviated from being squeezed by the lens barrel 1, and the temperature drift is improved. It should be noted that the arc surface 3 is not just an arc surface, and as long as it is a quasi-arc surface 3 scheme, it is the protection scope of this application. In a preferred embodiment, the mounting part 9 can include multiple, and multiple mounting parts 9 are arranged around the optical part 10 at intervals, reducing the material cost of the mounting part 9 and improving the installation accuracy of the lens and the lens barrel 1. That is, the mounting part 9 can be an integrated structure or a segmented structure, which are all the protection scopes of this application.

[0033] The lens group includes six lenses, which are the first lens G01, the second lens G02, the third lens G03, the fourth lens G04, the fifth lens G05 and the sixth lens G06 from the object side end A to the image side end B along the optical axis.

[0034] The waterproof ring includes a first waterproof ring 2 and a second waterproof ring 6. The first waterproof ring 2 is arranged between the first lens G01 and the second lens G02. The first waterproof ring 2 and the second waterproof ring 6 can be elastic structures, specifically, they can be made of EPDM (ethylene propylene diene monomer rubber). EPDM has excellent heat resistance and elasticity, which can meet product requirements. The first waterproof ring 2 is arranged between the first lens G01 and the second lens G02. When the first lens G01 and the second lens G02 are deformed due to temperature changes, the first waterproof ring 2 can alleviate the deformation, that is, the first waterproof ring 2 can improve the temperature drift of the vehicle-mounted lens.

[0035] More specifically, the fourth lens G04 and the fifth lens G05 are bonded by cement to form a cemented lens, and a second spacer 4 is provided between the third lens G03 and the fifth lens G05. The second spacer 4 includes a first shielding portion 401 and a second shielding portion 402, the first shielding portion 401 is provided at the image side end B of the third lens G03, and the second shielding portion 402 is provided at the object side end A of the fourth lens G04. The plurality of shielding portions are provided on the second spacer 4, which can effectively prevent stray light and improve imaging quality.

[0036] A first spacer 5 is provided between the fifth lens G05 and the sixth lens G06, and a second waterproof ring 6 is provided between the first spacer 5 and the sixth lens G06. By providing the second waterproof ring 6 between the first spacer 5 and the sixth lens G06, dust or water vapor can be effectively prevented from entering the interior of the vehicle lens through the gap between the sixth lens G06 and the first spacer 5, thereby ensuring the imaging quality of the vehicle lens.

[0037] More specifically, the low-temperature-drift vehicle-mounted lens further includes a locking pressure ring 7 and a filter 8. The locking pressure ring 7 is provided at the image side end B of the sixth lens G06, and the locking pressure ring 7 presses the sixth lens G06 toward the object side end A in the lens barrel 1. The filter 8 is adhesively fixed on the side of the locking pressure ring 7 away from the sixth lens G06 through glue. By directly adhesively fixing the filter 8 on the locking pressure ring 7 and removing the filter 8 bracket, the size of the vehicle-mounted lens is reduced and the assembly efficiency is improved.

[0038] More specifically, the first lens G01 has a positive optical power, the object side surface of the first lens G01 is convex, and the image side surface of the first lens G01 is concave; the second lens G02 has a negative optical power, the object side surface of the second lens G02 is concave, and the image side surface of the second lens G02 is concave; the third lens G03 has a positive optical power, the object side surface of the third lens G03 is concave, and the image side surface of the third lens G03 is convex; the fourth lens G04 has a positive optical power, the object side surface of the fourth lens G04 is convex, and the image side surface of the fourth lens G04 is convex; the fifth lens G05 has a negative optical power, the object side surface of the fifth lens G05 is concave, and the image side surface of the fifth lens G05 is convex; the sixth lens G06 has a negative optical power, the object side surface of the sixth lens G06 is concave, and the image side surface of the sixth lens G06 is convex. By designing the optical power and surface shape of multiple lenses in the lens group, the lens group can better adapt to environments with different temperature changes, and the temperature drift compensation performance of the vehicle-mounted lens is improved.

[0039] The total focal length of the lens group 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, and the sixth lens G06 are f1, f2, f3, f4, f5, and f6 respectively, where f1, f2, f3, f4, f5, and f6 satisfy the following ranges with respect to f: 1 < f1 / f < 2, -1 < f2 / f < 0, 1 < f3 / f < 2, 0 < f4 / f < 1, -3 < f5 / f < -2, -1 < f6 / f < 0. By designing the focal length of the lens group and the focal lengths of individual lenses, the imaging quality of the vehicle-mounted lens is improved.

[0040] More specifically, the lens barrel 1 and the locking pressure ring 7 are connected by threads; the use of the threaded connection method can improve the assembly stability of the lens group and increase the service life of the vehicle-mounted lens.

[0041] The lens barrel 1 is a metal lens barrel, and both the first spacer 5 and the second spacer 4 are metal spacers. Using a lens barrel and spacers made of metal materials can expand the application scenarios of the vehicle-mounted lens, meet different temperature change environments, and ensure the imaging quality of the vehicle-mounted lens.

[0042] The above-mentioned embodiments only express several implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the utility model. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A low temperature drift vehicle-mounted lens, comprising a lens barrel and a lens group arranged in the lens barrel, characterized in that: The lens group includes a plurality of lenses, and the outer peripheral side of at least one lens of the lens group is an arc surface, the arc surface abuts against the lens barrel, and a waterproof ring is arranged between the lenses.

2. The low temperature drift vehicle-mounted lens according to claim 1, characterized in that: The lens comprises an optical part and a mounting part, wherein the mounting part is arranged around the optical part, and the thickness of the mounting part along the optical axis direction is smaller than the thickness of the optical part, and the arc surface is arranged on the outer peripheral side of the mounting part.

3. The low temperature drift vehicle-mounted lens according to claim 2, characterized in that: The mounting parts include a plurality of mounting parts, and the plurality of mounting parts are arranged around the optical part at intervals.

4. The low temperature drift vehicle-mounted lens according to claim 1, characterized in that: The lens group includes six lenses, which are the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens from the object side end to the image side end along the optical axis. The waterproof ring includes a first waterproof ring, and the first waterproof ring is arranged between the first lens and the second lens.

5. The low temperature drift vehicle-mounted lens according to claim 4, characterized in that: The low-temperature drift vehicle-mounted lens also includes a locking ring and a filter. The locking ring is arranged at the image side end of the sixth lens, and the locking ring presses the sixth lens toward the object side end in the lens barrel. The filter is fixed on the side of the locking ring away from the sixth lens by glue.

6. The low temperature drift vehicle-mounted lens according to claim 5, characterized in that: The fourth lens and the fifth lens are bonded together by adhesive to form a cemented lens, and a second spacer is arranged between the third lens and the fifth lens.

7. The low temperature drift vehicle-mounted lens according to claim 6, characterized in that: The second spacer includes a first shielding portion and a second shielding portion, the first shielding portion is arranged at the image side end of the third lens, and the second shielding portion is arranged at the object side end of the fourth lens.

8. The low temperature drift vehicle-mounted lens according to claim 7, characterized in that: A first spacer is provided between the fifth lens and the sixth lens. The waterproof ring further includes a second waterproof ring. The second waterproof ring is provided between the first spacer and the sixth lens.

9. The low temperature drift vehicle-mounted lens according to claim 4, characterized in that: The first lens has positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; the second lens has negative optical power, the object side surface of the second lens is concave, and the image side surface of the second lens is concave; the third lens has positive optical power, the object side surface of the third lens is concave, and the image side surface of the third lens is convex; the fourth lens has positive optical power, the object side surface of the fourth lens is convex, and the image side surface of the fourth lens is convex; the fifth lens has negative optical power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the sixth lens has negative optical power, the object side surface of the sixth lens is concave, and the image side surface of the sixth lens is convex.

10. The low temperature drift vehicle-mounted lens according to claim 4, characterized in that: The total focal length of the lens group is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are f1, f2, f3, f4, f5, and f6 respectively, wherein f1, f2, f3, f4, f5, and f6 satisfy the following range with f: 1 <f1 / f<2,-1<f2 / f<0,1<f3 / f<2,0<f4 / f<1,-3<f5 / f<-2,-1<f6 / f<0。 11. The low temperature drift vehicle-mounted lens according to claim 8, characterized in that: The lens barrel is connected to the locking ring through threads; the lens barrel is a metal lens barrel, and the first spacer and the second spacer are both metal spacers.

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