Split optical lens and camera module and assembly method thereof

Abstract

A split optical lens and a camera module and an assembling method thereof. The split optical lens comprises a first optical lens assembly, a second optical lens assembly and an adhesive layer. The second optical lens assembly comprises a second lens barrel and at least one second lens element assembled in the second lens barrel. An identification type lens element among the second lens elements comprises a lens element body and at least one identification element. The lens element body has a functional area and a structure area surrounding the functional area. Each of the identification elements is arranged at a proper position on the structure area of the lens element body, for enabling a machine vision recognition device to detect and recognize, so as to determine an optical axis pose of the identification type lens element, and further represent an overall optical axis pose of the second optical lens assembly. The adhesive layer adheres the first optical lens assembly and the second optical lens assembly, so as to keep the first optical lens assembly and the second optical lens assembly at a relative position determined by active calibration.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and in particular to a split optical lens and camera module and its assembly method. Background Technology

[0002] With the rapid development of science and technology, the technologies related to camera modules used for image acquisition have also developed and progressed rapidly. In recent years, on the one hand, the market has placed increasingly higher demands on the imaging quality of camera modules, and on the other hand, the market has placed almost stringent requirements on the small size of camera modules (i.e., the smaller the space occupied by the camera module, the better). However, the smaller the space occupied by the camera module, the more difficult it is to improve its imaging quality.

[0003] Currently, as one of the core components of a camera module, the quality of the optical lens and the magnitude of assembly errors directly affect the imaging quality of the camera module. Specifically, a traditional optical lens typically consists of a lens barrel, multiple lens elements within the lens barrel, and spacers between adjacent lens elements. Each lens element has a slight difference in its central optical axis. Furthermore, during assembly / manufacturing, the internal dimensions of the lens barrel and the assembly precision between components can further increase the difference in the optical axes between adjacent lens elements, leading to a decrease in the quality of the optical lens and consequently affecting the imaging quality of the camera module, resulting in a low yield rate.

[0004] Research has shown that because the first lens element closest to the object side of an optical lens is close to the focal point, and incident light passes through this first lens element first when entering the lens, the optical axis alignment of this first lens element has the greatest impact on the quality of the optical lens. Therefore, a split-type optical lens has emerged on the market. This typically includes an upper lens group containing the first lens element and a lower lens group containing other lens elements. The other lens elements in the lower lens group are usually housed within the lens barrel, separating the first lens element from the others. When assembling this split-type optical lens, the optical axis position and tilt orientation of the lower lens group (i.e., the orientation of the other lens elements) are first determined by identifying the contour of the lens barrel. Then, the optical axis position of the first lens element is dynamically adjusted to ensure that its optical axis is aligned as closely as possible with the optical axes of the other lens elements, thereby obtaining a high-quality optical lens and improving the yield and assembly efficiency.

[0005] However, due to inherent misalignment and / or assembly errors when assembling multiple lenses into the lens barrel using either a loose or tight fit method, the relative positions of the lenses and the lens barrel are difficult to determine. This makes it challenging to accurately represent the optical axis position and tilt orientation of the lenses based on the identified lens barrel state. Therefore, the current method of determining the optical axis position and tilt orientation of the lower lens by identifying the lens barrel outline is inevitably inaccurate and prone to significant errors. Consequently, even after pre-positioning, the alignment between the first lens element of the upper lens and the other lenses of the lower lens remains significantly off, resulting in low pre-image quality. Furthermore, during subsequent active calibration, the poor image quality acquired by the image sensor and the substantial adjustments required between the upper and lower lenses necessitate more frequent adjustments to their relative positions, further reducing the assembly efficiency and quality of the separate optical lens. Summary of the Invention

[0006] One object of the present invention is to provide a split optical lens and camera module and a method for assembling the same, which can improve the recognition accuracy of lenses in the optical lens assembly and help to accurately determine the optical axis pose of the lenses in the optical lens assembly.

[0007] Another objective of this invention is to provide a split optical lens and camera module and a method for assembling the same, which can improve the recognition efficiency of lenses in the optical lens assembly and help to quickly determine the optical axis pose of the lenses in the optical lens assembly.

[0008] Another object of the present invention is to provide a split optical lens and a camera module and a method for assembling the same, which can improve the assembly efficiency of the split optical lens and help reduce the cost of industrial production and manufacturing.

[0009] Another objective of the present invention is to provide a split optical lens and a camera module and an assembly method thereof. In one embodiment of the present invention, the identification lens in the split optical lens is provided with an identification element, which is easily and quickly identified by a machine vision recognition device, thereby improving the assembly efficiency of the optical lens and significantly reducing manual labor.

[0010] Another object of the present invention is to provide a split optical lens and a camera module and an assembly method thereof. In one embodiment of the present invention, the marking element on the marking lens can be accurately identified by a machine vision recognition device so as to accurately determine the state of the optical lens assembly, which helps to reduce assembly deviations after pre-positioning and improve the assembly efficiency and assembly quality of the split optical lens.

[0011] Another object of the present invention is to provide a split optical lens and a camera module and a method for assembling the same, wherein, in one embodiment of the present invention, the marking element of the marking lens is located in the structural region of the lens body of the marking lens to prevent the marking element from interfering with the operation of the functional region of the lens body.

[0012] Another object of the present invention is to provide a split optical lens and a camera module and an assembly method thereof, wherein, in one embodiment of the present invention, the marker lens is adapted to be assembled at the object-side opening or image-side opening of the lens barrel of the optical lens assembly, which helps to identify the marker lens from the object side or image side of the optical lens assembly, so as to accurately determine the overall optical axis pose of the optical lens assembly, thereby improving the assembly quality of the split optical lens.

[0013] Another object of the present invention is to provide a split optical lens and a camera module and a method for assembling the same, wherein, in one embodiment of the present invention, the marking element of the marking lens has a circular structure so that the center of the marking element can be identified by a machine vision recognition device, and the orientation of the marking lens can be determined based on the shape of the marking element.

[0014] Another object of the present invention is to provide a split optical lens and a camera module and a method for assembling the same, wherein, in one embodiment of the present invention, the center of the marking element of the marking lens is located on the optical axis of the marking lens, so as to accurately determine the optical axis position of the marking lens by identifying the marking element.

[0015] Another object of the present invention is to provide a split optical lens and camera module and a method for assembling the same, wherein, in one embodiment of the present invention, the marking element of the marking lens can meet the recognition requirements of machine vision while minimizing the impact on the main structure of the lens, so as to be widely promoted.

[0016] Another object of the present invention is to provide a split optical lens and camera module and a method for assembling the same, wherein, to achieve the above object, the present invention does not require the use of expensive materials or complex structures. Therefore, the present invention successfully and effectively provides a solution that not only provides a split optical lens and camera module and a method for assembling the same, but also increases the practicality and reliability of the split optical lens and camera module and the method for assembling the same.

[0017] To achieve at least one of the above-mentioned inventive objectives or other objectives and advantages, the present invention provides a split-type optical lens, comprising:

[0018] A first optical lens assembly, wherein the first optical lens assembly includes at least one first lens element;

[0019] A second optical lens assembly, wherein the second optical lens assembly includes:

[0020] A second lens tube; and

[0021] At least one second lens, wherein the at least one second lens is fitted within the second lens barrel, and the at least one second lens includes at least one marker lens, wherein each marker lens has an optical axis and includes:

[0022] A lens body, wherein the lens body has a functional area and a structural area surrounding the functional area, wherein the optical axis of the identifying lens is located within the functional area of ​​the lens body; and

[0023] At least one identifying element, wherein each identifying element is disposed at an appropriate position on the structural region of the lens body, for enabling a machine vision recognition device to detect and identify, thereby determining the optical axis pose of the identifying lens, and further representing the overall optical axis pose of the second optical lens assembly; and

[0024] An adhesive layer, wherein the adhesive layer adheres the first optical lens assembly and the second optical lens assembly to maintain the first optical lens assembly and the second optical lens assembly in a relative position determined by active calibration.

[0025] In some embodiments of the present invention, all the marking elements are arranged in a ring.

[0026] In some embodiments of the present invention, the marking element has a circular structure, and the center of the marking element is located on the optical axis of the marking lens.

[0027] In some embodiments of the present invention, the marking element is an annular protrusion or an annular recess.

[0028] In some embodiments of the present invention, the marking element is integrally formed with the lens body.

[0029] In some embodiments of the present invention, the marking element is formed by bonding or die-cutting after the lens body is formed.

[0030] In some embodiments of the present invention, the marking element is a visible light marking element, wherein the visible light marking element is used to be detected and identified by the machine vision recognition device under visible light illumination, so as to determine the optical axis pose of the marking lens.

[0031] In some embodiments of the present invention, the visible light marker is a colored coating layer or a colorless frosted layer.

[0032] In some embodiments of the present invention, the marking element is a non-visible light marking element, wherein the non-visible light marking element is used to be detected and identified by the machine vision recognition device under non-visible light illumination, so as to determine the optical axis pose of the marking lens.

[0033] In some embodiments of the present invention, the non-visible light marker is an ultraviolet developing layer.

[0034] In some embodiments of the present invention, the marking element includes a plurality of dot-shaped marking portions arranged in a ring, wherein each dot-shaped marking portion is equidistant from the optical axis of the lens body.

[0035] In some embodiments of the present invention, the marking element includes at least one arc-shaped marking portion, wherein the center of each arc-shaped marking portion is located on the optical axis of the marking lens, and the central angle of each arc-shaped marking portion is less than 360°.

[0036] In some embodiments of the present invention, the second lens barrel has an object-side opening and an image-side opening, wherein the marking lens is located adjacent to the object-side opening or the image-side opening of the second lens barrel, and the marking element of the marking lens faces the object-side opening or the image-side opening of the second lens barrel, so as to enable the machine vision recognition device to detect the marking element through the object-side opening or the image-side opening of the second lens barrel.

[0037] In some embodiments of the present invention, the at least one second lens further includes at least one non-identifying lens, wherein the non-identifying lens and the identifying lens are fitted together within the second lens barrel.

[0038] In some embodiments of the present invention, the at least one first lens includes a first lens, and the first lens is directly bonded to the second lens barrel of the second optical lens assembly via the adhesive layer.

[0039] In some embodiments of the present invention, the at least one first lens includes a first lens, and the first lens is directly bonded to the second lens in the second optical lens assembly adjacent to the object-side opening of the second lens barrel via the adhesive layer.

[0040] In some embodiments of the present invention, the first optical lens assembly further includes a first lens barrel, wherein each of the first lenses is mounted in the first lens barrel, and the first lens barrel of the first optical lens assembly is bonded to the second lens barrel of the second optical lens assembly by the adhesive layer.

[0041] In some embodiments of the present invention, the at least one first lens of the first optical lens assembly includes at least one of the marker lenses.

[0042] In some embodiments of the present invention, the adhesive layer is formed by curing an adhesive, wherein the adhesive is a light-curing adhesive or a thermosetting adhesive.

[0043] According to another aspect of the present invention, a camera module is also provided, comprising:

[0044] At least one split-type optical lens, wherein each of the split-type optical lenses comprises:

[0045] A first optical lens assembly, wherein the first optical lens assembly includes at least one first lens element;

[0046] A second optical lens assembly, wherein the second optical lens assembly includes:

[0047] A second lens tube; and

[0048] At least one second lens, wherein the at least one second lens is fitted within the second lens barrel, and the at least one second lens includes at least one marker lens, wherein each marker lens has an optical axis and includes:

[0049] A lens body, wherein the lens body has a functional area and a structural area surrounding the functional area, wherein the optical axis of the identifying lens is located within the functional area of ​​the lens body; and

[0050] At least one identifying element, wherein each identifying element is disposed at an appropriate position on the structural region of the lens body, for enabling a machine vision recognition device to detect and identify, thereby determining the optical axis pose of the identifying lens, and further representing the overall optical axis pose of the second optical lens assembly; and

[0051] An adhesive layer, wherein the adhesive layer bonds the first optical lens assembly and the second optical lens assembly to maintain the first optical lens assembly and the second optical lens assembly in a relative position determined by active calibration; and

[0052] A photosensitive assembly, wherein each of the said separate optical lenses is correspondingly mounted on the photosensitive assembly.

[0053] According to another aspect of the present invention, the present invention also provides a method for assembling a split optical lens, comprising the steps of:

[0054] A first optical lens assembly and a second optical lens assembly, which are separate from each other, are prepared. The second optical lens assembly includes a second lens barrel and at least one second lens. The at least one second lens is mounted within the second lens barrel and includes at least one marker lens. Each marker lens includes a lens body and at least one marker element. The lens body has a functional area and a structural area surrounding the functional area. The optical axis of the marker lens is located within the functional area of ​​the lens body. Each marker element is positioned appropriately on the structural area of ​​the lens body to enable a machine vision recognition device to detect and identify the marker lens to determine its optical axis pose, thereby representing the overall optical axis pose of the second optical lens assembly.

[0055] The first optical lens assembly and the second optical lens assembly are pre-positioned to form an imageable optical system;

[0056] The relative positions between the first optical lens assembly and the second optical lens assembly are determined through active calibration; and

[0057] The first optical lens assembly and the second optical lens assembly are bonded together by an adhesive layer to keep the first optical lens assembly and the second optical lens assembly in the relative position determined by active calibration.

[0058] In some embodiments of the present invention, in the step of preparing a first optical lens assembly and a second optical lens assembly that are separate from each other:

[0059] The at least one second lens further includes at least one non-marking lens, wherein each of the non-marking lenses and each of the marking lenses are fitted together within the second lens barrel, and the marking lens is located adjacent to the object-side opening or image-side opening of the second lens barrel.

[0060] In some embodiments of the present invention, the step of pre-positioning the first optical lens assembly and the second optical lens assembly to form an imageable optical system includes the following steps:

[0061] By using the machine vision recognition device, the marking element of the marking lens in the second optical lens assembly is identified to determine the overall optical axis pose of the second optical lens assembly; and

[0062] The overall optical axis pose of the second optical lens assembly and / or the first optical lens assembly is adjusted multiple times until the deviation between the overall optical axis of the first optical lens assembly and the overall optical axis of the second optical lens assembly is less than a preset threshold.

[0063] In some embodiments of the present invention, the step of determining the relative position between the first optical lens assembly and the second optical lens assembly through active calibration includes the following steps:

[0064] A pre-image formed by the imageable optical system is acquired in real time using a photosensitive component;

[0065] The pre-image is processed in real time using an image algorithm to obtain the adjustment amount of the first optical lens assembly and / or the second optical lens assembly;

[0066] Based on the adjustment amount, the relative positions between the first optical lens assembly and the second optical lens assembly are actively adjusted in real time until the imaging quality of the imageable optical system after active adjustment reaches the preset target value.

[0067] In some embodiments of the present invention, the step of bonding the first optical lens assembly and the second optical lens assembly with an adhesive layer to maintain the first optical lens assembly and the second optical lens assembly in the relative position determined by active calibration includes the following steps:

[0068] Apply an adhesive to the first optical lens assembly and / or the second optical lens assembly; and

[0069] After the active calibration step is completed, the adhesive is cured to form the adhesive layer.

[0070] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0071] These and other objects, features and advantages of the present invention will be fully realized through the following detailed description, drawings and claims. Attached Figure Description

[0072] Figure 1 This is a cross-sectional schematic diagram of a split optical lens according to an embodiment of the present invention.

[0073] Figure 2 A top view schematic diagram of a second optical lens assembly of the split optical lens according to the above embodiment of the present invention is shown.

[0074] Figure 3A A perspective view of a marker lens in the split optical lens according to the above embodiment of the present invention is shown.

[0075] Figure 3B A cross-sectional schematic diagram of the marking lens according to the above embodiment of the present invention is shown.

[0076] Figure 4AA first modified embodiment of the marking lens according to the above-described embodiment of the present invention is shown.

[0077] Figure 4B A second modified embodiment of the identification lens according to the above-described embodiment of the present invention is shown.

[0078] Figure 4C A third modified embodiment of the marking lens according to the above-described embodiments of the present invention is shown.

[0079] Figure 4D A fourth modified embodiment of the marking lens according to the above-described embodiments of the present invention is shown.

[0080] Figure 4E A fifth modified embodiment of the identification lens according to the above-described embodiments of the present invention is shown.

[0081] Figure 4F A sixth modified embodiment of the identification lens according to the above-described embodiments of the present invention is shown.

[0082] Figure 4G A seventh modified embodiment of the identification lens according to the above-described embodiments of the present invention is shown.

[0083] Figure 5 A schematic diagram illustrating the assembly process of the split optical lens according to the above embodiment of the present invention is shown.

[0084] Figure 6A A first modified embodiment of the split optical lens according to the above-described embodiment of the present invention is shown.

[0085] Figure 6B A second modified embodiment of the split optical lens according to the above-described embodiment of the present invention is shown.

[0086] Figure 6C A third modified embodiment of the split optical lens according to the above-described embodiment of the present invention is shown.

[0087] Figure 6D A fourth modified embodiment of the split optical lens according to the above-described embodiment of the present invention is shown.

[0088] Figure 7 This is a cross-sectional schematic diagram of a camera module according to an embodiment of the present invention.

[0089] Figures 8A to 8D This is a schematic flowchart illustrating a method for assembling a split optical lens according to an embodiment of the present invention. Detailed Implementation

[0090] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0091] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0092] In this invention, the term "a" in the claims and specification should be understood as "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless explicitly indicated in the disclosure of this invention that the number of the element is only one, the term "a" should not be construed as unique or single, and the term "a" should not be construed as a limitation on the quantity.

[0093] In the description of this invention, it should be understood that terms such as "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, terms such as "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through a medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0095] Currently, to facilitate the adjustment of the optical axis alignment of the first lens element and improve the quality of optical lenses, a split-type optical lens has emerged on the market. This typically includes an upper lens group containing the first lens element and a lower lens group containing other lens elements. The other lens elements in the lower lens group are usually housed within the lens barrel, thus separating the first lens element from the others. In other words, when assembling this split-type optical lens, the central axis orientation of the lens barrel is first determined by identifying its contour. This allows for the assessment of the optical axis position and tilt orientation of the lens elements in the lower lens group (i.e., the optical axis orientation of the lens element). Then, the optical axis position of the first lens element is dynamically adjusted to align it as closely as possible with the optical axes of the other lens elements, thereby achieving a high-quality optical lens and improving the yield and assembly efficiency of optical lenses.

[0096] However, during the process of assembling one or more lenses into the lens barrel, whether by loose fitting or tight fitting, there will be offset and / or assembly errors, making it difficult to determine the relative position between the lens and the lens barrel. Consequently, it is difficult to accurately represent the optical axis pose of the lens by identifying the contour of the lens barrel. For example, when multiple lenses are assembled into the lens barrel using a tight fit method, although the outer diameter of the lens is similar to the inner diameter of the lens barrel (the difference between the outer diameter of the lens and the inner diameter of the lens barrel is within 10 micrometers), making the sidewall of the lens almost in close contact with the inner wall of the lens barrel, the lens is easily squeezed by the lens barrel, causing the optical axis of the lens to shift and form an angle with the central axis of the lens barrel. When multiple lenses are assembled into the lens barrel using a loose fit method, although there is a gap between the sidewall of the lens and the inner wall of the lens barrel (this gap is usually not less than 10 micrometers) and the lens will not be squeezed, the gap between the sidewall of the lens and the inner wall of the lens barrel will cause the lens to shift and tilt within the lens barrel, resulting in a shift and an angle between the optical axis of the lens and the central axis of the lens barrel.

[0097] Therefore, in the existing technology, determining the optical axis pose of the lenses in the lower lens group by identifying the outline of the lens barrel inevitably involves inaccuracies and significant errors. This results in a large alignment deviation between the first lens of the upper lens group and the other lenses of the lower lens group after pre-positioning, leading to low pre-image quality. Furthermore, during subsequent active calibration, the poor image quality acquired by the image sensor and the large adjustment required between the upper and lower lenses necessitate numerous adjustments to their relative positions, further reducing the assembly efficiency and quality of the split-type optical lens. To address these issues, a new split-type optical lens is urgently needed that can accurately determine the optical axis pose of the lenses within the split-type optical lens, thereby improving the assembly efficiency and quality of the split-type optical lens.

[0098] Refer to the attached diagram in the instruction manual. Figures 1 to 5 According to an embodiment of the present invention, a split optical lens and its assembly process are explained, wherein the split optical lens 10 includes a first optical lens assembly 11, a second optical lens assembly 12 and an adhesive layer 13, wherein the adhesive layer 13 bonds the first optical lens assembly 11 and the second optical lens assembly 12 to keep the first optical lens assembly 11 and the second optical lens assembly 12 in a relative position determined by active calibration, thereby forming an imageable optical system.

[0099] Specifically, such as Figure 1 and Figure 2 As shown, the first optical lens assembly 11 of the split optical lens 10 includes at least one first lens 111, and the second optical lens assembly 12 includes at least one second lens 121 and a second lens barrel 122. The second lens 121 is mounted within the second lens barrel 122, and the at least one second lens 121 includes at least one marker lens 100. That is, at least one of the at least one second lens 121 in the second optical lens assembly 12 is implemented as the marker lens 100 for identification by a machine vision recognition device to determine the optical axis pose of the marker lens 100 in the second optical lens assembly 12. It is understood that the machine vision recognition device mentioned in this invention can be implemented, but is not limited to, a camera device with processing and analysis capabilities, an intelligent robot, AR glasses with recognition functions, etc., as long as it can identify and determine the optical axis pose of the marker lens 100. This invention will not elaborate further on this.

[0100] It is worth mentioning that, although in the appendix Figures 1 to 5The following description uses the example of a split optical lens comprising only two optical lens assemblies to illustrate the features and advantages of the camera module of the present invention. Those skilled in the art will understand that the appendix... Figures 1 to 5 The separate optical lenses disclosed in the following description are merely examples and do not constitute a limitation on the content and scope of the present invention. For example, in other examples of the separate optical lenses, the number of optical lens assemblies may also exceed two to form multiple groups of optical lenses.

[0101] Furthermore, in the above embodiments of the present invention, as Figure 3A and 3B As shown, the marking lens 100 includes a lens body 101 and at least one marking element 102. The lens body 101 has a functional region 1011 and a structural region 1012, and the structural region 1012 is located around the functional region 1011. The marking lens 100 also has an optical axis 1000, and the optical axis 1000 is located in the functional region 1011 of the lens body 101. Each marking element 102 is disposed at an appropriate position on the structural region 1012 of the lens body 101 to enable the machine vision recognition device to detect and recognize it, thereby determining the optical axis pose of the marking lens 100 (i.e., the position and orientation of the optical axis 1000 of the marking lens 100), and then representing the overall optical axis pose of the second optical lens assembly 12 through the optical axis pose of the marking lens 100.

[0102] It is understood that the functional area 1011 of the lens body 101 of the marker lens 100 is mainly used to modulate and shape light so that the split optical lens 10 can form an image. In other words, the optical function of the marker lens 100 is mainly realized by the functional area 1011 of the lens body 101. The structural area 1012 of the lens body 101 of the marker lens 100 is mainly used to connect with components such as the structural areas of other lenses, spacers, or lens barrels to support the functional area 1011 of the lens body 101 to remain suspended.

[0103] It is worth noting that since the lenses used in optical lenses typically have a circular outline, the functional region 1011 and the structural region 1012 of the lens body 101 of the marking lens 100 of the present invention preferably also have a circular outline. The optical axis 1000 of the marking lens 100 typically passes through the center of the functional region 1011 of the lens body 101 (i.e., the center of the functional region 1011), making the optical axis 1000 of the marking lens 100 the central optical axis of the lens body 101. It is understood that, limited by the manufacturing precision of the lens, the optical axis 1000 of the marking lens 100 may slightly deviate from the center of the lens body 101. However, as long as this deviation is within the allowable range of manufacturing errors, the optical axis 1000 of the marking lens 100 is considered to pass through the center of the functional region 1011 of the lens body 101.

[0104] Specifically, according to the above embodiments of the present invention, all the marking elements 102 in the marking lens 100 are arranged in a ring shape so that the marking elements 102 can be visually identified and fitted into a circular curve to determine the optical axis pose of the marking lens 100. Further, all the marking elements 102 are arranged in a ring shape with the center of the functional area 1011 of the lens body 101 as the center, such that the center of the fitted circular curve coincides with the center of the functional area 1011 of the lens body 101 (i.e., the optical axis 1000 of the marking lens 100 passes through the center of the fitted circular curve), thereby determining the optical axis pose of the marking lens 100.

[0105] Preferably, such as Figure 3A and Figure 3B As shown, in the split optical lens 10 of the above embodiment of the present invention, the marking element 102 of the marking lens 100 has a circular structure, and the center O of the marking element 102 is located on the optical axis 1000 of the marking lens 100. That is, the marking element 102 with the circular structure has the center of the functional area 1011 of the lens body 101 of the marking lens 100 as the center, and the radius is a distance greater than the radius of the functional area 1011 of the lens body 101. Thus, while ensuring that the marking element 102 can accurately mark the position and orientation of the optical axis 1000 of the marking lens 100, the marking element 102 is also completely disposed in the structural area 1012 of the lens body 101 to avoid the marking element 102 blocking the functional area 1011 of the lens body 101 and to prevent the marking element 102 from interfering with the optical function of the marking lens 100.

[0106] For example, such as Figure 2 and Figure 3A As shown, in this embodiment of the invention, the marking element 102 of the marking lens 100 is implemented as an annular protrusion 1021, wherein the annular protrusion 1021 is located in the structural region 102 of the lens body 101, and the center of the outline of the annular protrusion 1021 coincides with the center of the functional region 1011 of the lens body 101. In other words, the center O of the annular protrusion 1021 is located on the optical axis 1000 of the marking lens 100, and the distance between the outline of the annular protrusion 1021 and the optical axis 1000 is equal to the radius R of the outline of the annular protrusion 1021, so as to determine the optical axis pose (i.e., the position and orientation of the optical axis 1000 of the marking lens 100) by recognizing the outline of the annular protrusion 1021. In this way, when determining the overall optical axis pose of the second optical lens assembly 12, only the optical axis pose of the marker lens 100 needs to be determined, without having to identify the outline of the second lens barrel 122 to determine the central axis pose of the second lens barrel 122. This effectively avoids the adverse effects of assembly deviations or assembly errors between the second lens barrel 122 and the second lens 121 on the determination result of the overall optical axis pose of the second optical lens assembly 12, and helps to significantly improve the accuracy of the determination result of the overall optical axis pose of the second optical lens assembly 12.

[0107] Preferably, such as Figure 3B As shown, the identification lens 100 is integral, meaning that the annular protrusion 1021 extends integrally outward from the structural region 102 of the lens body 101, and the annular protrusion 1021 is integrally formed with the lens body 101. In other words, the annular protrusion 1021 and the lens body 101 are formed together by a mold, which helps to minimize the positional and shape tolerances of the annular protrusion 1021, so as to accurately determine the optical axis position and orientation of the identification lens 100 by recognizing the contour of the annular protrusion 1021.

[0108] More preferably, such as Figure 3B As shown, the annular protrusion 1021 has a tapered cross section, so that the apex profile of the annular protrusion 1021 is used as the profile of the annular protrusion 1021, which facilitates more accurate determination of the optical axis pose of the marker lens 100.

[0109] Most preferably, the height of the annular protrusion 1021 is less than 100 micrometers, so as to prevent the annular protrusion 1021 from interfering with the assembly of the split optical lens 10.

[0110] It is worth noting that when the machine vision recognition device identifies the annular protrusion 1021, if the identification lens 100 does not tilt (i.e., the optical axis 1000 of the identification lens 100 does not tilt), the machine vision recognition device can fit a circle based on the contour of the annular protrusion 1021; if the identification lens 100 tilts (i.e., the optical axis 1000 of the identification lens 100 tilts), the machine vision recognition device can fit an ellipse based on the contour of the annular protrusion 1021. Therefore, the optical axis pose of the identification lens 100 can be determined by recognizing the contour of the annular protrusion 1021. Of course, in other examples of the present invention, although the annular protrusion 1021 still extends integrally from the structural region 102 of the lens body 101, the annular protrusion 1021 is formed by die-cutting the structural region 1012 of the lens body 101 after the lens body 101 is formed, so that the annular protrusion 1021 can still accurately represent the optical axis pose of the identification lens 100. The present invention will not elaborate further on this.

[0111] It is worth mentioning that, attached Figure 4A A first modified embodiment of the identifier lens 100 of the split optical lens 10 according to the above-described embodiment of the present invention is shown, wherein the identifier element 102 of the identifier lens 100 is implemented as an annular recess 1022, wherein the annular recess 1022 is integrally recessed inward from the structural region 102 of the lens body 101, and the center of the outline of the annular recess 1022 coincides with the center of the functional region 1011 of the lens body 101. In other words, the center of the annular recess 1022 is located on the optical axis 1000 of the identifier lens 100, and the distance between the outline of the annular recess 1022 and the optical axis 1000 is equal to the radius of the outline of the annular recess 1022, so that the optical axis pose of the identifier lens 100 can be determined by recognizing the outline of the annular recess 1022. It is understood that, in this modified embodiment of the present invention, since the annular recess 1022 is recessed inward and does not protrude from the surface of the lens body 101, the annular recess 1022 is not easily damaged by collisions with other objects such as lens barrels, so as to protect the marking element 102.

[0112] For example, such as Figure 4AAs shown, the annular recess 1022 is integrally formed with the lens body 101. That is, the annular recess 1022 and the lens body 101 are formed together using a mold. This helps to minimize the positional and shape tolerances of the annular recess 1022, so that the position and orientation of the optical axis 1000 of the identification lens 100 can be accurately determined by identifying the contour of the annular recess 1022. Of course, in other examples of the invention, the annular recess 1022 may also be formed by die-cutting the structural region 1012 of the lens body 101 after the lens body 101 has been formed; this will not be elaborated further in this invention.

[0113] Appendix Figure 4B A second modified embodiment of the identifier lens 100 of the split optical lens 10 according to the above-described embodiment of the present invention is shown. Specifically, compared with the above-described embodiment of the present invention, the identifier lens 100' of the second modified embodiment of the present invention differs in that: the identifier lens 100' is split, that is, the annular protrusion 1021' of the identifier lens 100' and the lens body 101 are manufactured separately first, and then the annular protrusion 1021' is installed onto the structural region 1012 of the lens body 101. It can be understood that in this modified embodiment of the present invention, after the lens body 101 is manufactured separately, it can be used as an ordinary lens (i.e., a non-identifier lens); while after the annular protrusion 1021' is installed on the lens body 101, it becomes the identifier lens 100', and when the annular protrusion 1021' is installed on the lens body 101, the original structure of the lens body 101 is not damaged, which helps to maintain the original structural strength of the lens body 101. Furthermore, the material of the annular protrusion 1021' can be the same as or different from the material of the lens body 101, which will not be elaborated further in this invention.

[0114] For example, such as Figure 4B As shown, the annular protrusion 1021' is adhesively fixed to the structural region 1012 of the lens body 101. Specifically, when manufacturing the identification lens 100', the outline of the lens body 101 is first accurately identified to determine the mounting position of the annular protrusion 1021' on the structural region 1012 of the lens body 101; then, the annular protrusion 1021' is precisely mounted to the structural region 1012 of the lens body 101, so that the annular protrusion 1021' can be identified to determine the optical axis pose of the identification lens 100'.

[0115] Of course, in other examples of the present invention, the annular protrusion 1021' can also be detachably installed to the structural region 1012 of the lens body 101 by means such as fitting, so that after the annular protrusion 1021' is damaged, a new annular protrusion 1021' can be replaced to repair the identification lens 100', so as not to cause the identification lens 100' to be scrapped due to the damage of the annular protrusion 1021'. Furthermore, since the annular protrusion 1021' is detachably mounted on the lens body 101, and the marker lens 100' can still be used as a regular lens after the annular protrusion 1021' on the marker lens 100' is removed, the marker lens 100' can still be used as a regular lens. Therefore, during the assembly of the split optical lens 10, after the first optical lens assembly 11 and the second optical lens assembly 12 have been pre-positioned or actively calibrated, the annular protrusion 1021' can be removed from the lens body 101 of the marker lens 100', making the marker lens 100' a regular lens. This prevents the annular protrusion 1021' from adversely affecting subsequent active calibration work or the imaging quality or application of the split optical lens 10.

[0116] Appendix Figure 4C A third modified embodiment of the marking lens 100 of the split optical lens 10 according to the above-described embodiments of the present invention is shown. Specifically, compared with the above-described embodiments of the present invention, the marking lens 100 of the third modified embodiment of the present invention differs in that: the marking lens 100 includes a plurality of marking elements 102 arranged in a ring, and each marking element 102 is implemented as a dot-shaped marking portion 1023, wherein each dot-shaped marking portion 1023 is located in the structural region 1012 of the lens body 101, and the distance between each dot-shaped marking portion 1023 and the center of the functional region 1011 of the lens body 101 (or the optical axis 1000 of the marking lens 100) is equal. In other words, the plurality of dot-shaped marking portions 1023 are distributed along a circular arc on the structural region 1012 of the lens body 101, with the center of the functional region 1011 of the lens body 101 as the center and a distance greater than the radius of the functional region 1011 as the radius, so that the machine vision recognition device can identify the dot-shaped marking portions 1023, fit a ring by the distribution characteristics of the dot-shaped marking portions 1023, and then obtain the optical axis pose of the marking lens 100 by analyzing the center and shape of the ring.

[0117] Preferably, the size of the dot-shaped marking portion 1023 is less than 100 micrometers, so as to minimize the impact of the dot-shaped marking portion 1023 on the structure of the lens body 101 while satisfying machine vision recognition.

[0118] For example, such as Figure 4C As shown, in this modified embodiment of the invention, the marking lens 100 includes four dot-shaped marking portions 1023, and each dot-shaped marking portion 1023 may, but is not limited to, be implemented as a dot-shaped recess. The four dot-shaped recesses are evenly distributed in the structural region 1012 of the lens body 101, and the distance between each dot-shaped recess and the center of the functional region 1011 of the lens body 101 is the same. In other words, the geometric center O3 defined by the four dot-shaped recesses is located on the optical axis 1000 of the marking lens 100, and the distance between the dot-shaped recesses and the optical axis 1000 is equal to a predetermined distance R3, so that the optical axis pose of the marking lens 100 can be determined by identifying the distribution of the dot-shaped recesses. Preferably, the dot-shaped recesses have an inverted conical structure so that the pose of the optical axis 1000 of the marking lens 100 can be accurately defined by the position and distribution of the pointed bottoms of the dot-shaped recesses. Of course, in other examples of the present invention, the dot-shaped marking portion 1023 may also be implemented as a dot-shaped protrusion or other dot-shaped structure, as long as it can be recognized by machine vision to accurately determine the optical axis pose of the marking lens 100. The present invention will not elaborate on this further.

[0119] Appendix Figure 4D A fourth modified embodiment of the marking lens 100 of the split optical lens 10 according to the above-described embodiment of the present invention is shown. Specifically, compared with the above-described embodiment of the present invention, the marking lens 100 of the fourth modified embodiment of the present invention differs in that: the marking element 102 of the marking lens 100 is implemented as an arc-shaped marking portion 1024, and the center of the arc-shaped marking portion 1024 is located at the center of the functional area 1011 of the lens body 101, that is, the optical axis 1000 of the marking lens 100 passes through the center of the arc-shaped marking portion 1024. It is worth noting that the central angle of the arc-shaped marking portion 1024 is less than 360°, that is, the arc-shaped marking portion 1024 does not have a complete circular structure, but the machine vision recognition device can still recognize the arc-shaped marking portion 1024 and fit a complete circle according to the contour of the arc-shaped marking portion 1024, thereby determining the optical axis pose of the marking lens 100.

[0120] Preferably, the marking lens 100 may also include two or more spaced-apart arc-shaped marking portions 1024, wherein all the arc-shaped marking portions 1024 have the same center, and the central angle of the arc-shaped marking portions 1024 is less than 90°, which helps to obtain a more accurate determination of the optical axis pose of the marking lens 100. Of course, in other examples of the present invention, the marking lens 100 may also include only one arc-shaped marking portion 1024, wherein the central angle of the arc-shaped marking portion 1024 is greater than 180°, so as to accurately determine the optical axis pose of the marking lens 100 by recognizing the contour of the arc-shaped marking portion 1024.

[0121] For example, such as Figure 4D As shown, in this modified embodiment of the invention, the marking lens 100 includes two arc-shaped marking portions 1024, each of which is implemented as an arc-shaped protrusion with a central angle less than 90°, and the two arc-shaped protrusions are arranged centrally symmetrically to determine the optical axis pose of the marking lens 100 by visually identifying the contours of the two arc-shaped protrusions. It is understood that in other examples of the invention, the arc-shaped marking portion 1024 of the marking lens 100 may also be implemented as an arc-shaped recess, which will not be elaborated further in this invention.

[0122] Appendix Figure 4E A fifth modified embodiment of the marking lens 100 of the split optical lens 10 according to the above-described embodiments of the present invention is shown. Specifically, compared with the above-described embodiments of the present invention, the marking lens 100 of the fifth modified embodiment of the present invention differs in that: the marking element 102 of the marking lens 100 is implemented as a visible light marking element 1025, wherein the visible light marking element 1025 is disposed in the structural region 1012 of the lens body 101, and the visible light marking element 1025 is used to be detected and identified by the machine vision recognition device under visible light illumination to determine the optical axis pose of the marking lens 100.

[0123] For example, such as Figure 4E As shown, in this modified embodiment of the invention, the visible light marker 1025 may, but is not limited to, be implemented as a colored coating layer 10251 coated on the structural region 1012 of the lens body 101, wherein the colored coating layer 10251 is distributed in a ring shape, and the center of the outline of the colored coating layer 10251 is located on the optical axis 1000 of the marker lens 100, so that it can be detected and identified by the machine vision recognition device under visible light illumination.

[0124] Preferably, the colored coating layer 10251 of the visible light marker 1025 is implemented as an annular ink layer, which not only facilitates detection and recognition by the machine vision recognition device, but also prevents light from passing through the structural region 1012 of the lens body 101 and affecting the quality of the split optical lens 10.

[0125] It is worth noting that, although the advantages and features of the present invention are illustrated in the fifth modified embodiment of the present invention described above, where the visible light marker 1025 is an example of a colored coating layer, the visible light marker 1025 is not limited to being implemented as a colored coating layer. For example, such as Figure 4F As shown, in the sixth modified embodiment of the present invention, the visible light marker 1025 of the marker lens 100 can also be implemented as a colorless frosted layer 10252. Although the colorless frosted layer 10252 is formed in the structural region 1012 of the lens body 101 by frosting and has no color, the colorless frosted layer 10252 can be distinguished from the non-frosted region of the lens body 101 (such as the functional region 1011 of the lens body 101) because it has a light-scattering effect, so it can still be detected and identified by the machine vision recognition device to determine the optical axis pose of the marker lens 100.

[0126] Appendix Figure 4G A seventh modified embodiment of the marking lens 100 of the split optical lens 10 according to the above-described embodiment of the present invention is shown. Specifically, compared with the fifth modified embodiment of the present invention, the marking lens 100 of the seventh modified embodiment of the present invention differs in that: the marking element 102 of the marking lens 100 is implemented as a non-visible light marking element 1026, wherein the non-visible light marking element 1026 is disposed in the structural region 1012 of the lens body 101, and the non-visible light marking element 1026 is only detected and identified by the machine vision recognition device under non-visible light illumination to determine the optical axis pose of the marking lens 100. It is understood that the non-visible light marker 1026 will not develop under visible light, but will develop under non-visible light so that it can be detected and identified by the machine vision recognition device. This makes the marker lens 100 look no different from the ordinary lens when the split optical lens 10 is in normal use. Only when the split optical lens 10 is assembled and non-visible light is used can the difference between the marker lens 100 and the ordinary lens be shown, so as to accurately obtain the optical axis pose of the marker lens 100.

[0127] For example, such as Figure 4GAs shown, in this modified embodiment of the present invention, the non-visible light marking element 1026 may, but is not limited to, be implemented as an ultraviolet developing layer coated on the structural region 1012 of the lens body 101, wherein the ultraviolet developing layer is distributed in a ring shape, and the center of the outline of the ultraviolet developing layer is located on the optical axis 1000 of the marking lens 100, so that under ultraviolet light (not shown in the figure), the ultraviolet developing layer develops and is detected and identified by the machine vision recognition device. It is worth noting that in other examples of the present invention, the ultraviolet developing layer may also be covered within the structural region 1012 of the lens body 101, which can also achieve the marking characteristics of the marking lens 100, and the present invention will not elaborate further on this.

[0128] It is worth mentioning that, since the overall optical axis pose of the second optical lens assembly 12 of the split optical lens 10 of the present invention is usually represented by the optical axis pose of the identified marker lens 100 in the second optical lens assembly 12, the assembly tolerance between the optical axis of the non-marker lens (such as a normal lens) in the second lens 121 of the second optical lens assembly 12 and the optical axis of the marker lens 100 should be as small as possible in order to improve the accuracy of the overall optical axis pose of the second optical lens assembly 12 obtained by machine vision recognition.

[0129] Specifically, in the above embodiments of the present invention, such as Figure 1 As shown, the second optical lens assembly 12 of the split optical lens 10 further includes at least one non-marking lens 100P, wherein, compared with the marking lens 100, the non-marking lens 100P only includes the lens body and does not include the marking element, so that the non-marking lens 100P is implemented as a normal lens.

[0130] Preferably, the non-identifying lens 100P and the identifying lens 100 are fitted into the second lens barrel 122 to form the second optical lens assembly 12 that can be recognized by machine vision.

[0131] It is worth noting that, due to the use of a mating method, the subsequent multiple non-marked lenses 100P are assembled by mating with the marked lens 100. Therefore, the influence of the second lens barrel 122 on the second lens 121 (including the non-marked lenses 100P and the marked lens 100) is reduced, making the optical axis of the non-marked lenses 100P closer to the optical axis of the marked lens 100. This helps to reduce the assembly tolerance between the optical axis of the non-marked lenses 100P and the optical axis of the marked lens 100 in the second lens 121 of the second optical lens assembly 12. Of course, in other examples of the present invention, a portion of the non-marked lenses 100P are assembled with the marked lens 100 using a mating structure, which still ensures that the assembly tolerance between the optical axis of the non-marked lenses 100P and the optical axis of the marked lens 100 is within the allowable range. This will not be elaborated further in this invention.

[0132] More preferably, such as Figure 1 As shown, the second lens barrel 122 of the second optical lens assembly 12 has an object-side opening 1221 and an image-side opening 1222. The marker lens 100 is located adjacent to the object-side opening 1221 of the second lens barrel 122, and the marker element 102 correspondingly faces the object-side opening 1221 of the second lens barrel 122. This allows the machine vision recognition device to detect and identify the marker element 102 through the object-side opening 1221 of the second lens barrel 122 to determine the optical axis pose of the marker lens 100. In other words, the marker lens 100 is located between the object-side opening 1221 of the second lens barrel 122 and the non-marker lens 100P, and the marker element 102 of the marker lens 100 is disposed on the object-side surface 1013 of the lens body 101 of the marker lens 100, allowing the machine vision recognition device to detect the marker element 102 from the object side of the second optical lens assembly 12.

[0133] It is understandable that, such as Figure 1 and Figure 3B As shown, the lens body 101 of the marker lens 100 has an object side 1013 and an image side 1014, wherein when the marker lens 100 is assembled in the second lens barrel 122, the object side 1013 of the lens body 101 of the marker lens 100 faces the object side of the second optical lens assembly 12, and the image side 1014 of the lens body 101 faces the image side of the second optical lens assembly 12.

[0134] Most preferably, such as Figure 2As shown, the outline radius R of the annular protrusion 1021 of the marking element 102 is smaller than the inner radius r of the object-side opening 1221 of the second lens barrel 122, so as to ensure that the machine vision recognition device can detect the outline of the annular protrusion 1021 through the object-side opening 1221 of the second lens barrel 122.

[0135] It is worth noting that, in this embodiment of the present invention, the object-side opening 1221 and the image-side opening 1222 of the second lens barrel 122 serve as the light entrance and light exit opening of the second optical lens assembly 12, respectively; correspondingly, the object-side surface 1013 and the image-side surface 1014 of the lens body 101 of the marker lens 100 serve as the light entrance and light exit surfaces of the marker lens 100, respectively. Furthermore, since the positional change of the lens closest to the object side in the second lens 121 of the second optical lens assembly 12 has a significant impact on the imaging of the split optical lens 10 (i.e., the optical system), placing the marker lens 100 at the position closest to the object-side opening 1221 of the second lens barrel 122 helps to more accurately determine the overall optical axis pose of the second optical lens assembly 12.

[0136] According to the above embodiments of the present invention, such as Figure 1 As shown, the first optical lens assembly 11 of the split optical lens 10 further includes a first lens barrel 112, wherein the first lens 111 is assembled in the first lens barrel 112, and the adhesive layer 13 adhesively fixes the first lens barrel 112 of the first optical lens assembly 11 to the second lens barrel 112 of the second optical lens assembly 12, so as to assemble the split optical lens 10 with imaging function.

[0137] For example, such as Figure 1 As shown, in this embodiment of the invention, the at least one first lens 111 of the first optical lens assembly 11 is implemented as a non-marking lens 100P, and the non-marking lens 100P is assembled within the first lens barrel 112. The at least one second lens 121 of the second optical lens assembly 12 includes one marking lens 100 and three non-marking lenses 100P, wherein both the marking lens 100 and the non-marking lenses 100P are assembled within the second lens barrel 122, and the marking lens 100 is located at the position closest to the object-side opening 1221 of the second lens barrel 122. The adhesive layer 13 is located between the first lens barrel 112 of the first optical lens assembly 11 and the second lens barrel 122 of the second optical lens assembly 12 to fix the relative position between the first optical lens assembly 11 and the second optical lens assembly 12.

[0138] More specifically, such as Figure 5 As shown, when assembling the split optical lens 10, the machine vision recognition device 500 first identifies the marking element 102 of the marking lens 100 in the second optical lens assembly 11 to determine that the optical axis pose of the marking lens 100 represents the overall optical axis pose of the second optical lens assembly 11; then, the first optical lens assembly 11 and the second optical lens assembly 12 are pre-positioned along the identified optical axis direction so that the first optical lens assembly 11 and the second optical lens assembly 12 form a pre-imageable optical system; then, a photosensitive component 600 first acquires a pre-image of a target plate 700 through the pre-imageable optical system in real time, and the imaging quality and adjustment amount of the pre-imageable optical system are calculated by image algorithms such as SFR and MTF, and then... The relative positions between the first optical lens assembly 11 and the second optical lens assembly 12 are actively adjusted in real time in at least one direction (i.e., at least one of the directions of movement along the XYZ axis and rotation around the XYZ axis) according to the adjustment amount, so as to complete the active calibration when the imaging quality of the pre-imageable optical system after adjustment reaches the target value, thereby determining the relative positions between the first optical lens assembly 11 and the second optical lens assembly 12; finally, by curing the applied adhesive 130, the adhesive layer 13 is formed between the first optical lens assembly 11 and the second optical lens assembly 12, fixing the first optical lens assembly 11 and the second optical lens assembly 12 at the relative positions determined by the active calibration, thereby assembling the split optical lens 10.

[0139] It is worth noting that in this assembly example of the present invention, after pre-positioning and active calibration, the adhesive 130 is applied to the second lens barrel 122 of the second optical lens assembly 12; finally, after completing the active calibration, the adhesive 130 is cured to form the adhesive layer 13 for fixingly bonding the first optical lens assembly 11 and the second optical lens assembly 12. It is understood that the adhesive 130 may be, but is not limited to, a photocurable or thermocurable adhesive, such that the adhesive 130 is cured under light (visible light or ultraviolet light) or heat to form the adhesive layer 13.

[0140] Of course, in other examples of the present invention, the adhesive 130 may also be applied between the completion of pre-positioning and the start of active calibration, or the adhesive 130 may be applied before pre-positioning, so as to provide sufficient time for pre-positioning and active calibration after the application of the adhesive 130. This will not be elaborated further in this regard. Furthermore, the adhesive 130 may also be applied to the first lens barrel 112 of the first optical lens assembly 11, or the adhesive 130 may also be applied to both the first lens barrel 112 of the first optical lens assembly 11 and the second lens barrel 122 of the second optical lens assembly 12. The present invention does not further limit this.

[0141] It is worth mentioning that, attached Figure 6A A first modified embodiment of the split optical lens 10 according to the above-described embodiment of the present invention is shown. Compared to the above-described embodiment of the present invention, the split optical lens 10 of the first modified embodiment of the present invention differs in that: the marker lens 100 in the second lens 121 of the second optical lens assembly 12 is located adjacent to the image-side opening 1222 of the second lens barrel 122, and the marker element 102 of the marker lens 100 correspondingly faces the image-side opening 1222 of the second lens barrel 122, such that the machine vision recognition device can detect and recognize the marker element 102 through the image-side opening 1222 of the second lens barrel 122 to determine the optical axis pose of the marker lens 100. In other words, the marker lens 100 is located between the image-side opening 1222 of the second lens barrel 122 and the non-marker lens 100P, and the marker element 102 of the marker lens 100 is disposed on the image-side surface 1014 of the lens body 101 of the marker lens 100, so that the machine vision recognition device can detect the marker element 102 from the image side of the second optical lens assembly 12.

[0142] It is worth noting that, such as Figure 6AAs shown, in this modified embodiment of the invention, the second optical lens assembly 12 further includes a retaining ring 123, wherein the retaining ring 123 is disposed in the image-side opening 1222 of the second lens barrel 122 to fixally mount the plurality of second lenses 121 into the second lens barrel 122. Preferably, the contour radius of the annular protrusion 1021 of the marking element 102 is smaller than the inner radius of the retaining ring 123, so as to prevent the retaining ring 123 from obscuring the contour of the annular protrusion 1021 of the marking element 102, ensuring that the machine vision recognition device can detect the contour of the annular protrusion 1021 through the image-side opening 1222 of the second lens barrel 122. That is, the machine vision recognition device can detect and recognize the marking element 102 of the marking lens 100 in the second optical lens assembly 12 from the image side of the second optical lens assembly 12, so as to prevent the first optical lens assembly 12 from obstructing the field of view of the machine vision recognition device.

[0143] Appendix Figure 6B A second modified embodiment of the split optical lens 10 according to the above-described embodiment of the present invention is shown. Compared with the above-described embodiment of the present invention, the split optical lens 10 of the second modified embodiment of the present invention differs in that: the first lens 111 of the first optical lens assembly 11 also includes at least one of the marker lenses 100, and the marker element 102 of the marker lens 100 is also located on the object side 1013 of the lens body 101 of the marker lens 100, so that the optical axis orientation of the first lens 111 of the first optical lens assembly 11 and the optical axis orientation of the second lens 121 of the second optical lens assembly 12 can be accurately identified by a machine vision recognition device, which helps to further improve the pre-positioning accuracy of the split optical lens 10 during assembly. It is understood that, since the first lens 111 of the first optical lens assembly 11 is implemented as the marker lens 100, in this modified embodiment of the present invention, the overall optical axis pose of the first optical lens assembly 11 of the split optical lens 10 can be determined by recognizing the recognition element 102 of the marker lens 100, rather than by recognizing the contour of the first lens barrel 112. This helps to improve the accuracy of the overall optical axis pose of the first optical lens assembly 11, thereby facilitating the improvement of the pre-positioning accuracy of the split optical lens 10 during assembly, reducing the number of adjustments required during active calibration, and improving assembly efficiency and yield.

[0144] It is worth noting that, in other examples of the present invention, the marking element 102 of the marking lens 100 in the first optical lens assembly 11 may be located on the image side 1014 of the lens body 101 of the marking lens 100, so that the optical axis pose of the first lens 111 of the first optical lens assembly 11 and the optical axis pose of the second lens 121 of the second optical lens assembly 12 can still be accurately identified by the two machine vision recognition devices.

[0145] Appendix Figure 6C A third modified embodiment of the split optical lens 10 according to the above-described embodiments of the present invention is shown. Compared with the above-described embodiments of the present invention, the split optical lens 10 of the third modified embodiment of the present invention differs in that: the first optical lens assembly 11 includes only one first lens 111 and does not include the first lens barrel 112, wherein the first lens 111 is directly bonded to the second optical lens assembly 12 through the adhesive layer 13 to assemble the split optical lens 10.

[0146] Exemplarily, in this modified embodiment of the invention, such as Figure 6C As shown, the first lens 111 of the first optical lens assembly 11 can, but is not limited to, be implemented as the non-marked lens 100P, and the first lens 111 of the first optical lens assembly 11 is directly bonded to the second lens barrel 122 of the second optical lens assembly 12 via the adhesive layer 13, so that the first lens 111 is supported by the second lens barrel 122. It is worth noting that since the first optical lens assembly 11 does not include the first lens barrel 112 to expose the first lens 111, the machine vision recognition device can determine the optical axis pose of the first lens 111 (i.e., the overall optical axis pose of the first optical lens assembly 12) by recognizing the contour of the first lens 111. Therefore, even if the first lens 111 is implemented as the non-marked lens 100P, the machine vision recognition device can accurately identify and determine the overall optical axis pose of the first optical lens assembly 12.

[0147] It is worth mentioning that the exposed first lens 111 is not limited to the second lens barrel 122 that is adhesively fixed to the second optical lens assembly 12. For example, in the fourth modified embodiment of the present invention, such as Figure 6DAs shown, the first lens 111 of the first optical lens assembly 11 is directly bonded to the second lens 121 of the second optical lens assembly 12 via the adhesive layer 13, so as to support the first lens 111 via the second lens 121. Specifically, the first lens 111 of the first optical lens assembly 11 is directly and adhesively fixed to the marking lens 100 in the second optical lens assembly 12 adjacent to the object-side opening 1221 of the second lens barrel 122. It can be understood that, in order to avoid the annular protrusion 1021 of the marking lens 100 interfering with the bonding of the first lens 111, the marking lens 100 in this modified embodiment of the invention further includes a boss, wherein the boss is located around the annular protrusion 1021, and the height of the boss is greater than the height of the annular protrusion 1021, so as to provide a bonding position for the first lens 111 to fixarily support the first lens 111.

[0148] According to another aspect of the present invention, one embodiment further provides a camera module. Specifically, as... Figure 7 As shown, the camera module 1 includes at least one of the aforementioned split optical lenses 10 and a photosensitive assembly 20. The photosensitive assembly 20 includes at least one photosensitive chip 21, and the split optical lenses 10 are correspondingly mounted on the photosensitive assembly 20 such that each split optical lens 10 is located on the photosensitive path of the photosensitive chip 21, thereby allowing external light to be received by the photosensitive chip 21 for imaging after passing through the split optical lenses 10. It is worth noting that in other examples of the invention, the camera module 1 may further include a driver (not shown), wherein the second lens barrel 122 of the second optical lens assembly 12 of the split optical lens 10 is mounted within the driver, and the driver is mounted on the photosensitive assembly 20, enabling the driver to drive the split optical lenses 10 to move back and forth along the photosensitive path of the photosensitive chip 21 to adjust the focal length of the camera module 1 by adjusting the distance between the split optical lenses 10 and the photosensitive chip 21.

[0149] See attached diagram. Figures 8A to 8D As shown, according to another aspect of the present invention, one embodiment of the present invention further provides a method for assembling a split optical lens. For example... Figure 8A As shown, the assembly method of the split optical lens 10 includes the following steps:

[0150] S410: Prepare a first optical lens assembly 11 and a second optical lens assembly 12, which are separated from each other. The second optical lens assembly 12 includes a second lens barrel 122 and at least one second lens 121. The at least one second lens 121 is assembled within the second lens barrel 122 and includes at least one marker lens 100. Each marker lens 100 includes a lens body 101 and at least one marker element 102. The lens body 101 has a functional region 1011 and a structural region 1012 surrounding the functional region 1011. The optical axis 1000 of the marker lens 100 is located in the functional region 1011 of the lens body 101. Each marker element 102 is disposed at an appropriate position on the structural region 1012 of the lens body 101 to enable the machine vision recognition device 500 to detect and recognize the marker lens 100 to determine its optical axis pose, thereby representing the overall optical axis pose of the second optical lens assembly 12.

[0151] S420: Pre-position the first optical lens group 11 and the second optical lens assembly 12 to form an imageable optical system;

[0152] S430: Determine the relative position between the first optical lens assembly 11 and the second optical lens assembly 12 through active calibration; and

[0153] S440: The first optical lens assembly 11 and the second optical lens assembly 12 are bonded together by the adhesive layer 13 to keep the first optical lens assembly 11 and the second optical lens assembly 12 in the relative position determined by active calibration.

[0154] It is worth noting that in step S410 of the present invention, the at least one second lens 121 further includes at least one non-marking lens 100P, wherein each non-marking lens 100P and each marking lens 100 are fitted together within the second lens barrel 122, and the marking lens 100 is located adjacent to the object-side opening 1221 or the image-side opening 1222 of the second lens barrel 122.

[0155] Furthermore, such as Figure 8B As shown, in one example of the present invention, step S420 in the assembly method of the split optical lens 10 includes the following steps:

[0156] S421: By means of the machine vision recognition device 500, the identification element 12 of the identification lens 100 in the second optical lens assembly 12 is identified to determine the overall optical axis pose of the second optical lens assembly 12; and

[0157] S422: Adjust the overall optical axis pose of the second optical lens group 12 and / or the first optical lens assembly 11 multiple times until the deviation between the overall optical axis of the first optical lens assembly 11 and the overall optical axis of the second optical lens assembly 12 is less than a preset threshold.

[0158] It is worth mentioning that, such as Figure 8C As shown, in one example of the present invention, step S430 of the assembly method of the split optical lens 10 includes the following steps:

[0159] S431: A pre-image formed by the imageable optical system is acquired in real time by means of a photosensitive component 600;

[0160] S432: The pre-image is processed in real time using an image algorithm to obtain the adjustment amount of the first optical lens assembly 11 and / or the second optical lens assembly 12;

[0161] S433: Based on the adjustment amount, the relative positions between the first optical lens assembly 11 and the second optical lens assembly 12 are actively adjusted in real time until the imaging quality of the imageable optical system after active adjustment reaches the preset target value.

[0162] Furthermore, such as Figure 8D As shown, in one example of the present invention, step S440 of the assembly method of the split optical lens 10 includes the following steps:

[0163] S441: Apply an adhesive 130 to the first optical lens assembly 11 and / or the second optical lens assembly 12; and

[0164] S442: After completing the active calibration step, the adhesive 130 is cured to form the adhesive layer 13.

[0165] It is worth noting that step S441 of the present invention can be performed before or after step S430; or step S441 can also be performed before step S420. The present invention does not impose further restrictions on the timing of applying the adhesive 130.

[0166] It is worth mentioning that one embodiment of the present invention can also provide a method for assembling a camera module (not shown in the figure), the specific steps of which include: firstly assembling the split optical lens 10 according to the above-described assembly method for split optical lenses; then, installing the split optical lens 10 onto the photosensitive assembly 20, so that the split optical lens 10 is located on the photosensitive path of the photosensitive chip 21 of the photosensitive assembly 20. Of course, in other examples of the present invention, the second optical lens assembly 12 can also be installed onto the photosensitive assembly 20 first, and then the first optical lens assembly 11 and the second optical lens assembly 12 can be assembled into the split optical lens 10 according to the above-described assembly method for split optical lenses.

[0167] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any variations or modifications may be made to the implementation of the present invention without departing from the stated principles.

Claims

1. A split-type optical lens, characterized in that, include: A first optical lens assembly, wherein the first optical lens assembly comprises only one first lens element; A second optical lens assembly, wherein the second optical lens assembly includes: A second lens tube; and At least one second lens, wherein the at least one second lens is fitted within the second lens barrel, and the at least one second lens includes at least one marker lens, wherein each marker lens has an optical axis, and includes: a lens body, wherein the lens body has a functional region and a structural region surrounding the functional region, wherein the optical axis of the marker lens is located within the functional region of the lens body; and At least one identification element, wherein each identification element is disposed at an appropriate position on the structural region of the lens body, for enabling a machine vision recognition device to detect and identify, thereby determining the optical axis pose of the identification lens, and further representing the overall optical axis pose of the second optical lens assembly; and An adhesive layer, wherein the adhesive layer adheres the first optical lens assembly and the second optical lens assembly to maintain the first optical lens assembly and the second optical lens assembly in a relative position determined by active calibration; Wherein, the first lens is a non-marking lens, and the first lens is directly bonded to the protrusion of the marking lens in the second optical lens assembly adjacent to the object-side opening of the second lens barrel through the adhesive layer, and the height of the protrusion is greater than the height of the marking element.

2. The split optical lens as described in claim 1, wherein, All the identification elements are arranged in a ring.

3. The split optical lens as described in claim 2, wherein, The marking element has a circular structure, and the center of the marking element is located on the optical axis of the marking lens.

4. The split optical lens as described in claim 3, wherein, The marking element is a ring-shaped protrusion or a ring-shaped recess.

5. The split optical lens as described in claim 4, wherein, The marking element is integrally formed with the lens body.

6. The split optical lens as described in claim 3, wherein, The marking element is formed by bonding or die-cutting after the lens body is molded.

7. The split optical lens as described in claim 2, wherein, The marking element is a visible light marking element, wherein the visible light marking element is used to be detected and identified by the machine vision recognition device under visible light illumination, so as to determine the optical axis position of the marking lens.

8. The split optical lens as described in claim 7, wherein, The visible light marking element is a colored coating layer or a colorless frosted layer.

9. The split optical lens as described in claim 2, wherein, The marking element is a non-visible light marking element, wherein the non-visible light marking element is used to be detected and identified by the machine vision recognition device under non-visible light illumination, so as to determine the optical axis pose of the marking lens.

10. The split optical lens as described in claim 9, wherein, The non-visible light marker is an ultraviolet developing layer.

11. The split optical lens as described in claim 2, wherein, The marking element includes a plurality of dot-shaped marking portions, wherein each dot-shaped marking portion is equidistant from the optical axis of the lens body.

12. The split optical lens as described in claim 1, wherein, The marking element includes at least one arc-shaped marking portion, wherein the center of each arc-shaped marking portion is located on the optical axis of the marking lens, and the central angle of each arc-shaped marking portion is less than 360°.

13. The split optical lens as described in any one of claims 1 to 12, wherein, The second lens barrel has an object-side opening and an image-side opening, wherein the marking lens is located adjacent to the object-side opening of the second lens barrel, and the marking element of the marking lens faces the object-side opening of the second lens barrel, so that the machine vision recognition device can detect the marking element through the object-side opening of the second lens barrel.

14. The split optical lens as described in claim 13, wherein, The at least one second lens further includes at least one non-identifying lens, wherein the non-identifying lens and the identifying lens are fitted together within the second lens barrel.

15. The split optical lens as described in any one of claims 1 to 12, wherein, The adhesive layer is formed by curing an adhesive, wherein the adhesive is a light-curing adhesive or a thermosetting adhesive.

16. A camera module, characterized in that, Includes at least one split optical lens, wherein each of the split optical lenses comprises: A first optical lens assembly, wherein the first optical lens assembly comprises only one first lens element; A second optical lens assembly, wherein the second optical lens assembly includes: a second lens barrel; and at least one second lens, wherein the at least one second lens is mounted within the second lens barrel, and the at least one second lens includes at least one marker lens, wherein each marker lens has an optical axis, and includes: a lens body, wherein the lens body has a functional region and a structural region surrounding the functional region, wherein the optical axis of the marker lens is located within the functional region of the lens body; and at least one marker element, wherein each marker element is disposed at an appropriate position on the structural region of the lens body for enabling a machine vision recognition device to detect and identify, thereby determining the optical axis pose of the marker lens, and thus representing the overall optical axis pose of the second optical lens assembly; and an adhesive layer, wherein the adhesive layer adheres to the first optical lens assembly and the second optical lens assembly to maintain the first optical lens assembly and the second optical lens assembly in a relative position determined by active calibration; and a photosensitive assembly, wherein each of the separate optical lenses is correspondingly mounted to the photosensitive assembly; Wherein, the first lens is a non-marking lens, and the first lens is directly bonded to the protrusion of the marking lens in the second optical lens assembly adjacent to the object-side opening of the second lens barrel through the adhesive layer, and the height of the protrusion is greater than the height of the marking element.

Images