Lens optimization method of vehicle-mounted camera lens module and lens module optimization method
By adding a compensator to the area to be optimized for the lens of the vehicle-mounted camera lens module, and using optical simulation software to design an optimization solution, the problem of excessive number of lenses in the prior art is solved, and better MTF curve performance and optical imaging effect are achieved.
Patent Information
- Application Number
- CN202411972028.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2025-04-22
AI Technical Summary
Excessive number of lenses in existing vehicle-mounted camera lens modules makes it difficult to optimize the imaging effect, and the increase in the number of lenses will lead to increased module size and manufacturing costs.
By adding a compensator to the area to be optimized in the lens, and using optical simulation software to design an optimization scheme based on the principles of chromatic aberration and aberration correction, the imaging optical path and MTF curve of the lens are optimized.
It effectively improves the MTF curve performance of the lens, improves the optical imaging effect, reduces the number of lenses that need to be optimized, and reduces the cost of optimization processing.
Smart Images
Figure CN119861482A_ABST
Abstract
Description
Technical Field
[0001] The embodiments of the present invention relate to the technical field of vehicle-mounted camera production and design, and in particular to a lens optimization method and a lens module optimization method for a vehicle-mounted camera lens module. Background Art
[0002] At present, when designing and producing lens modules for vehicle-mounted cameras, the MTF (Modulation Transfer Function) curve is usually used to characterize the imaging effect of the lens module. With the improvement of the requirements for imaging quality, most existing lens modules are combined with multiple lenses. This is because after the lens design is completed, its optical imaging effect and MTF curve are fixed and difficult to compensate and optimize. The combination of multiple lenses can improve the performance of the overall MTF curve of the lens module; however, too many lenses will lead to a significant increase in the size of the lens module, and will also increase the design and manufacturing costs of the lens module. Summary of the invention
[0003] The technical problem to be solved by the embodiments of the present invention is to provide a lens optimization method for a vehicle-mounted camera lens module, which can effectively improve the performance of the MTF curve of the lens in the lens module.
[0004] A further technical problem to be solved by an embodiment of the present invention is to provide a method for optimizing a lens module of a vehicle-mounted camera, which can effectively improve the performance of the MTF curve of the lens in the lens module.
[0005] In order to solve the above technical problems, the embodiment of the present invention provides the following technical solution: a lens optimization method for a vehicle-mounted camera lens module, comprising the following steps: Obtaining an original imaging optical path diagram and an original MTF curve diagram of the lens to be optimized; Importing the original imaging optical path diagram and the original MTF curve diagram as well as the target MTF curve diagram predetermined for the lens to be optimized into the optical simulation software; An optimization scheme is designed based on the chromatic aberration and aberration correction principle for simulating the lens, so that the optimized lens obtains the target MTF curve diagram, the optimization scheme includes an optimization method and optimization parameters, the optimization method is to add a compensating body to the area to be optimized of the lens, and the optimization parameters at least include: the range of the area to be optimized, the type of compensating material constituting the compensating body, and the design shape of the compensating body; and The optimization scheme is adopted to optimize the physical object of the lens.
[0006] Furthermore, the adding of the compensating body to the region to be optimized of the lens specifically comprises: adding the compensating material to the lens in a manner that does not damage the original outer surface of the lens.
[0007] Furthermore, the specific method of adding the compensating body is to use a coating process, 3D printing or a coating process to attach the compensating material to the original outer surface of the lens and form the compensating body.
[0008] Furthermore, the adding of the compensating body to the region to be optimized of the lens specifically includes: adding the compensating body to the lens in a manner of destroying the original outer surface of the lens.
[0009] Furthermore, the specific method of adding the compensation material is: forming a positioning pit in the area to be optimized on the original outer surface of the lens, and embedding a compensation body pre-made of the compensation material into the positioning pit.
[0010] Furthermore, after the compensating body is attached to the region to be optimized of the lens, the outer surface of the compensating body is polished to obtain the designed shape.
[0011] Furthermore, the compensation material is an optical dielectric material different from the manufacturing substrate of the lens.
[0012] Furthermore, the area to be optimized is designed on the light-emitting surface of the lens.
[0013] Furthermore, the optical simulation software is Zemax optical simulation software and Code V optical simulation software.
[0014] On the other hand, in order to solve the above further technical problems, the embodiment of the present invention further provides the following technical solution: a lens module optimization method for a vehicle-mounted camera, comprising the following steps: Testing and analyzing an imaging optical path diagram and an MTF curve diagram of a lens module including multiple lenses, and determining a lens to be optimized in the lens module and a target MTF curve diagram of the lens to be optimized; The lens to be optimized is optimized using any of the lens optimization methods described above.
[0015] After adopting the above technical scheme, the embodiment of the present invention has at least the following beneficial effects: the embodiment of the present invention imports the original imaging optical path diagram and the original MTF curve diagram of the lens to be optimized and the predetermined target MTF curve diagram into the optical simulation software, and forms an optimization scheme for the lens simulation design based on the chromatic aberration and aberration correction principles in the optical simulation software, so that the optimized lens can meet the target MTF curve diagram. When the actual lens is processed, a compensating body with a predetermined design shape is additionally constructed in the area to be optimized of the lens, so as to utilize the compensating body to optimize the optical imaging effect of the area to be optimized, and finally obtain a lens with good performance of the MTF curve. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 The present invention is a flowchart of the steps of an optional embodiment of the lens optimization method of the vehicle-mounted camera lens module of the present invention.
[0017] Figure 2 This is an original imaging optical path diagram of a lens of an optional embodiment of the lens optimization method of the vehicle-mounted camera lens module of the present invention.
[0018] Figure 3 This is an original MTF curve diagram of a lens of an optional embodiment of the lens optimization method of the vehicle-mounted camera lens module of the present invention.
[0019] Figure 4 This is a target MTF curve diagram of a lens of an optional embodiment of the lens optimization method for a vehicle-mounted camera lens module of the present invention.
[0020] Figure 5 This is an imaging optical path diagram after the lens is optimized in an optional embodiment of the lens optimization method of the vehicle-mounted camera lens module of the present invention.
[0021] Figure 6 A schematic diagram of an optional embodiment of the optimization method for the lens optimization method of the vehicle-mounted camera lens module of the present invention.
[0022] Figure 7 A schematic diagram of another optimization method of an optional embodiment of the lens optimization method for a vehicle-mounted camera lens module of the present invention.
[0023] Figure 8 The present invention is a schematic diagram of another optimization method of an optional embodiment of the lens optimization method of the vehicle-mounted camera lens module. DETAILED DESCRIPTION
[0024] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.
[0025] like Figure 1 As shown, an optional embodiment of the present invention provides a lens optimization method for a vehicle-mounted camera lens module, comprising the following steps: S1: obtaining an original imaging optical path diagram and an original MTF curve diagram of the lens 1 to be optimized; S2: importing the original imaging optical path diagram and the original MTF curve diagram as well as the target MTF curve diagram predetermined for the lens 1 to be optimized into the optical simulation software; S3: Based on the principle of chromatic aberration and aberration correction, an optimization scheme is simulated and designed for the lens 1, so that the optimized lens 1 obtains the target MTF curve diagram, the optimization scheme includes an optimization method and optimization parameters, the optimization method is to add a compensating body 10 to the area to be optimized of the lens 1, and the optimization parameters at least include: the range of the area to be optimized, the type of compensating material constituting the compensating body 10, and the design shape of the compensating body 10; and S4: using the optimization scheme to optimize the actual object of the lens 1.
[0026] Among them, the original imaging optical path diagram and the original MTF curve diagram of the lens 1 to be optimized are usually ready-made data after the lens 1 is initially designed and manufactured, and the target MTF curve diagram is the ideal MTF curve diagram that the lens 1 to be optimized is determined after relevant analysis to achieve through optimization. In the embodiment of the present invention, the original imaging optical path diagram and the original MTF curve diagram of the lens 1 to be optimized and the predetermined target MTF curve diagram are all imported into the optical simulation software, and the lens 1 is simulated and designed based on the principles of chromatic aberration and aberration correction in the optical simulation software to form an optimization scheme, so that the optimized lens 1 can meet the target MTF curve diagram. When the actual lens 1 is processed, a compensation body 10 with a predetermined design shape is additionally constructed in the region to be optimized of the lens 1, so that the compensation body 10 is used to optimize the optical imaging effect of the region to be optimized, and finally a lens 1 with good MTF curve performance is obtained.
[0027] See Figure 2 and Figure 3 The original imaging optical path diagram of the lens 1 shown in the figure is difficult to effectively focus on the photosensitive surface, and its original MTF curve diagram also performs very poorly. The optimization solution is to optimize the original MTF curve diagram of the lens 1 to the target MTF curve diagram, such as Figure 4 As shown; see Figure 5 As shown in FIG. 1 , the imaging optical path diagram of the lens 1 after optimization can be well focused on the photosensitive surface, so that the imaging quality is better. In the specific implementation, it can be understood that the size of the design shape of the compensating body 10 is usually very small. Figure 6-Figure 8 In the embodiment of FIG. 1 , the compensating body 10 is enlarged for the convenience of illustration.
[0028] In an optional embodiment of the present invention, Figure 6 As shown, the adding of the compensating body 10 to the area to be optimized of the lens 1 specifically includes adding the compensating material to the lens 1 in a manner that does not damage the original outer surface of the lens 1. In this embodiment, the adding of the compensating material to the lens 1 in a manner that does not damage the original outer surface of the lens 1 makes the optimization easier and the compensating body 10 is easy to form.
[0029] In an optional embodiment of the present invention, the specific method of adding the compensating body 10 is to use a coating process, 3D printing or a coating process to attach the compensating material to the original outer surface of the lens 1 and form the compensating body 10. In this embodiment, in order to add the compensating material to the original outer surface of the lens 1, a relatively mature process such as a coating process, a 3D printing process or a coating process can be used, which is simple and easy to implement, and is conducive to reducing the cost of optimization processing.
[0030] In an optional embodiment of the present invention, the adding of the compensating body 10 to the region to be optimized of the lens 1 specifically comprises: adding the compensating body 10 to the lens 1 in a manner of destroying the original outer surface of the lens 1. In this embodiment, since the optical imaging performance of the region to be optimized of the lens 1 is poor, based on this, the region to be optimized of the original outer surface of the lens 1 can be destroyed, and the compensating body 10 can be added to the region to be optimized again, thereby improving the optical imaging performance of the region.
[0031] In an optional embodiment of the present invention, Figure 7 As shown, the specific method of adding the compensation material is: forming a positioning pit 12 in the area to be optimized of the original outer surface of the lens 1, and embedding the compensation body 10 pre-made of the compensation material into the positioning pit 12. In this embodiment, specifically, the original substrate portion of the area to be optimized of the lens 1 is removed to form the positioning pit 12, and then the compensation body 10 pre-made of the compensation material is refilled in the positioning pit 12, which is particularly suitable for the case where the body of the compensation body 10 to be added is thicker / larger, and the thickness and weight of the entire lens will not change too much.
[0032] In an optional embodiment of the present invention, Figure 8 As shown, after the compensating body 10 is attached to the area to be optimized of the lens 1, the outer surface of the compensating body 10 is also polished to obtain the designed shape. In this embodiment, for a compensation area with a large area or relatively dispersed, the blank 14 of the compensation material 10 can be attached to the compensation area, and then the blank 14 is further polished to form the designed shape. The outer surface shape of the compensating body 10 can be processed with high precision, which is conducive to improving the optical performance, and the polishing process is very mature and easy to implement. It can be understood that when the high-precision design shape has been obtained when the compensating body 10 is formed, it is not necessary to perform the polishing process.
[0033] In an optional embodiment of the present invention, the compensation material is an optical medium material different from the manufacturing substrate of the lens 1. In this embodiment, different optical medium materials are used as compensation materials, so that when the light enters the compensation body 10 from the lens 1 and when it is emitted from the compensation body 10, there will be obvious changes in the optical path, thereby improving the imaging optical path of the area to be optimized, so that the optimized lens 1 has a better MTF curve performance and obtains a better optical imaging effect. Specifically, the compensation material is a CDGM lens substrate, a Schott lens substrate or a Hoya lens substrate.
[0034] In an optional embodiment of the present invention, the area to be optimized is designed on the light-emitting surface of the lens 1. In this embodiment, the area to be optimized is specifically designed on the light-emitting surface of the lens 1. Designing the area to be optimized on the light-emitting surface of the lens 1 can more directly affect the optical path of the light emitted from the lens 1, thereby reducing the difficulty of the optimization design.
[0035] In an optional embodiment of the present invention, the optical simulation software is Zemax optical simulation software and Code V optical simulation software. In this embodiment, using Zemax optical simulation software and Code V optical simulation software, which are commonly used optical simulation software, is not only easy to operate and low in cost, but also has good simulation design effect.
[0036] On the other hand, an embodiment of the present invention further provides a method for optimizing a lens module of a vehicle-mounted camera, comprising the following steps: Testing and analyzing an imaging optical path diagram and an MTF curve diagram of a lens module including multiple lenses 1, and determining the lens 1 to be optimized in the lens module and a target MTF curve diagram of the lens 1 to be optimized; The lens to be optimized is optimized using the lens optimization method described in any of the above embodiments.
[0037] In this embodiment, the lens 1 to be optimized is first selected from the lens module through testing and analysis, and then the lens optimization method described in any of the above embodiments is used to optimize the lens to be optimized. This can not only effectively improve the performance of the overall MTF curve of the lens module, but also help reduce the number of lenses 1 that need to be optimized.
[0038] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, which all belong to the protection scope of the present invention.
Claims
1. A lens optimization method for a vehicle-mounted camera lens module, characterized in that: The method comprises the following steps: Obtaining an original imaging optical path diagram and an original MTF curve diagram of the lens to be optimized; Importing the original imaging optical path diagram and the original MTF curve diagram as well as the target MTF curve diagram predetermined for the lens to be optimized into the optical simulation software; An optimization scheme is designed based on the chromatic aberration and aberration correction principle for simulating the lens, so that the optimized lens obtains the target MTF curve diagram, the optimization scheme includes an optimization method and optimization parameters, the optimization method is to add a compensating body to the area to be optimized of the lens, and the optimization parameters at least include: the range of the area to be optimized, the type of compensating material constituting the compensating body, and the design shape of the compensating body; and The optimization scheme is adopted to optimize the physical object of the lens.
2. The lens optimization method of the vehicle-mounted camera lens module according to claim 1, characterized in that: The adding of the compensating body to the region to be optimized of the lens specifically comprises: adding a compensating material to the lens in a manner that does not damage the original outer surface of the lens.
3. The lens optimization method of the vehicle-mounted camera lens module as claimed in claim 2, characterized in that: The specific method of adding the compensating body is to use a coating process, 3D printing or a coating process to attach the compensating material to the original outer surface of the lens and form the compensating body.
4. The lens optimization method of the vehicle-mounted camera lens module as claimed in claim 1, characterized in that: The method of adding a compensating body to the region to be optimized of the lens specifically comprises: adding the compensating body to the lens in a manner of destroying the original outer surface of the lens.
5. The lens optimization method for the vehicle-mounted camera lens module as claimed in claim 4, characterized in that: The specific method of adding the compensation material is: forming a positioning pit in the area to be optimized on the original outer surface of the lens, and embedding a compensation body pre-made of the compensation material into the positioning pit.
6. The lens optimization method of the vehicle-mounted camera lens module according to claim 3 or 5, characterized in that: After the compensating body is attached to the region of the lens to be optimized, the outer surface of the compensating body is polished to obtain the designed shape.
7. The lens optimization method for the vehicle-mounted camera lens module according to claim 1, characterized in that: The compensation material is an optical dielectric material different from the substrate from which the lens is made.
8. The lens optimization method for a vehicle-mounted camera lens module as claimed in claim 1, characterized in that: The area to be optimized is designed on the light-emitting surface of the lens.
9. The lens optimization method of the vehicle-mounted camera lens module according to claim 1, characterized in that: The optical simulation software is Zemax optical simulation software and Code V optical simulation software.
10. A method for optimizing a lens module of a vehicle-mounted camera, characterized in that: The method comprises the following steps: Testing and analyzing an imaging optical path diagram and an MTF curve diagram of a lens module including multiple lenses, and determining a lens to be optimized in the lens module and a target MTF curve diagram of the lens to be optimized; The lens to be optimized is optimized using the lens optimization method as described in any one of claims 1 to 9.