Optical lens, camera module and assembly method

Abstract

The present invention provides an optical lens, comprising: a first lens component, a second lens component and a first adhesive material. The first lens group of the first lens component and the second lens group of the second lens component together constitute an imageable optical system, wherein the second lens barrel of the second lens component has an outer top surface and an inner top surface, and the second lens group rests on the inner top surface. The outer top surface includes a cloth adhesive surface suitable for arranging the first adhesive material and an extension surface formed by extending from the cloth adhesive surface to the central axis of the second lens barrel, the cloth adhesive surface has a first thickness to the inner top surface, the extension surface has a second thickness to the inner top surface, and the first thickness is greater than the second thickness. The present invention also provides a corresponding camera module and an assembly method. The present invention can improve the mechanical strength and reliability of the second lens component black object; can improve the yield of the optical lens or camera module; and contribute to the miniaturization of the camera module.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an optical lens, a camera module and an assembly method. Background Art

[0002] With the development of mobile phones, computers and other terminals, users have a significant increase in various demands. Especially with the development of mobile phones, users' pursuit of shooting quality has led manufacturers to develop personalized and customized camera modules, such as large aperture, wide angle, and lenses with a large number of lenses to solve aberrations. On the one hand, this is an increasingly complex optical design, and on the other hand, the reality is that complex optical systems are very sensitive, which poses a considerable challenge to manufacturing yield and product quality. Because the optical system of a camera module with a large aperture and wide angle is more sensitive, the reliability of its manufacturing process and verification process will be more fragile than conventional designs, so a lens with a better structure is now needed.

[0003] On the other hand, in order to meet the increasingly broad market demand, high pixel, small size, and large aperture are the irreversible development trend of existing camera modules. However, it is very difficult to achieve the three requirements of high pixel, small size, and large aperture in the same camera module. For example, the compact development of mobile phones and the increase in the screen-to-body ratio of mobile phones have made the space inside the mobile phone for the front camera module smaller and smaller, while the market has put forward higher and higher requirements on the imaging quality of the camera module.

[0004] In the field of compact camera modules (such as camera modules for mobile phones), it is often necessary to consider the quality of optical imaging lenses and manufacturing errors in the module packaging process. Specifically, in the manufacturing process of optical imaging lenses, factors affecting the resolution of the lens come from errors in the components and their assembly, errors in the thickness of the lens spacing components, errors in the assembly and coordination of the lenses, and changes in the refractive index of the lens materials. Because there are many factors that affect the resolution of the lens, which exist in multiple components, and the control of each factor has a limit to manufacturing accuracy, if the accuracy of each component is simply improved, the improvement ability is limited, the improvement cost is high, and it cannot meet the market's increasing demand for imaging quality.

[0005] The applicant has proposed an assembly method for manufacturing a complete optical lens or camera module by adjusting and determining the relative positions of the upper and lower sub-lenses based on an active calibration process, and then bonding the upper and lower sub-lenses together according to the determined relative positions. This solution can improve the process capability index (CPK) of mass-produced optical lenses or camera modules; it can relax the requirements for the accuracy of each component of the material (such as the sub-lens or photosensitive components used to assemble the optical lens or camera module) and its assembly accuracy, thereby reducing the overall cost of the optical imaging lens and the camera module; it can adjust the various aberrations of the camera module in real time during the assembly process, reduce the defect rate, reduce production costs, and improve imaging quality.

[0006] However, actively calibrating the optical system of the lens itself is a new production process. Actual mass production needs to consider many factors such as the reliability, drop resistance, weather resistance and production cost of the optical lens and camera module. Sometimes it is also necessary to face the yield reduction caused by various unpredictable factors. The applicant believes that improving the structural reliability of optical lenses manufactured based on the active calibration process is an important direction for improving the imaging quality and yield of such optical lenses. Therefore, there is an urgent need for a solution that can improve the structural reliability of optical lenses manufactured based on the active calibration process. Summary of the invention

[0007] The present invention aims to provide a solution that overcomes at least one of the drawbacks of the prior art.

[0008] According to one aspect of the present invention, an optical lens is provided, comprising: a first lens component, which includes a first lens group, the first lens group includes at least one first lens; a second lens component, which includes a second lens barrel and a second lens group installed in the second lens barrel, the second lens group includes at least one second lens, the first lens group and the second lens group together constitute an imageable optical system, wherein the second lens barrel has an outer top surface and an inner top surface, and the second lens group is supported by the inner top surface; and a first adhesive material, which is arranged between the outer top surface and the bottom surface of the first lens component, and the first adhesive material is suitable for supporting and fixing the first lens component and the second lens component after curing, so that the relative position of the above two components is maintained at the relative position determined by active calibration, wherein the outer top surface includes a cloth adhesive surface suitable for arranging the first adhesive material and an extension surface formed by extending from the cloth adhesive surface to the central axis of the second lens barrel, the cloth adhesive surface has a first thickness to the inner top surface, the extension surface has a second thickness to the inner top surface, and the first thickness is greater than the second thickness.

[0009] Wherein, the first adhesive material is not arranged on the extension surface.

[0010] Wherein, a transition surface is provided between the cloth adhesive surface and the extension surface.

[0011] Wherein, the transition surface is an inclined surface, and the angle between the transition surface and the central axis of the second lens barrel is 30°-85°.

[0012] Wherein, the adhesive surface of the cloth is a flat surface.

[0013] Wherein, the inner top surface includes a supporting surface that supports the second lens group and a non-supporting surface that does not support the second lens group, the supporting surface has a first end close to the central axis and a second end away from the central axis, and, in the radial direction, one end of the transition surface connected to the extension surface is located between the first end and the second end, wherein the radial direction is a direction perpendicular to the central axis.

[0014] There is a midpoint between the first end and the second end; and in the radial direction, one end of the transition surface connected to the extension surface is located at the midpoint, or at a position closer to the central axis than the midpoint.

[0015] Wherein, in the axial direction, the distance from the fabric rubber surface to the extension surface is at least 50 micrometers, and the axial direction is a direction parallel to the central axis.

[0016] Wherein, the first lens component further includes a first lens barrel, and the first lens group is installed in the first lens barrel.

[0017] The first lens group includes an optical zone and a structural zone surrounding the optical zone, and the bottom surface of the structural zone has an indented surface for avoiding the fabric adhesive surface.

[0018] Wherein, the retracted surface includes an inclined surface corresponding to the transition surface.

[0019] Wherein, the distance between the extension surface and the bottom surface of the first lens group is 30-150 microns.

[0020] Wherein, the distance between the transition surface of the second lens barrel and the inclined surface of the first lens group is at least twice the distance between the extension surface and the bottom surface of the first lens group.

[0021] Among them, there is a first design distance and a second design distance between the first lens component and the second lens component, and the first design distance is at least twice the second design distance; the first design distance is: the design distance between the transition surface of the second lens barrel and the inclined surface of the first lens group determined by the optical design of the optical system, and the second design distance is: the design distance between the extension surface and the bottom surface of the first lens group determined by the optical design of the optical system.

[0022] Wherein, there is a non-zero angle between the optical axis of the first lens component and the optical axis of the second lens component.

[0023] The inner side surface of the second lens barrel has a plurality of steps, and the at least one second lens is sequentially embedded in the plurality of steps to form the second lens group.

[0024] The present invention also provides a camera module, which includes any of the aforementioned optical lenses.

[0025] The present invention also provides an optical lens assembly method, comprising: preparing a first lens component and a second lens component, wherein the first lens component comprises a first lens group, the first lens group comprises at least one first lens, the second lens component comprises a second lens barrel and a second lens group installed in the second lens barrel, the second lens group comprises at least one second lens, the second lens barrel has an outer top surface and an inner top surface, the second lens group rests on the inner top surface, the outer top surface comprises a fabric adhesive surface and an extension surface formed by extending from the fabric adhesive surface to the central axis of the second lens barrel, the fabric adhesive surface has a first thickness to the inner top surface, the extension surface has a second thickness to the inner top surface, and the first thickness is greater than the second thickness; pre-positioning the first lens component and the second lens component so that the first lens group and the second lens group together constitute an imageable optical system; actively calibrating the relative positions of the first lens component and the second lens component based on the imaging result of the optical system; and bonding the first lens component and the second lens component so that the relative positions of the above two components are maintained at the relative positions determined by the active calibration.

[0026] Wherein, in the preparation step, the inner side surface of the second lens barrel has a plurality of steps, and the preparation step further comprises: inverting the second lens barrel, and then sequentially embedding the at least one second lens into the plurality of steps to assemble the second lens group.

[0027] Wherein, the pre-positioning step further includes: obtaining the positions of the first lens component and the second lens component by laser ranging, and then performing the pre-positioning, wherein the position of the second lens component is obtained by performing laser ranging on the outer top surface.

[0028] The bonding step includes: arranging a first adhesive material on the adhesive surface of the fabric; and curing the first adhesive material so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by the active calibration.

[0029] The step of curing the first adhesive material comprises: pre-curing the first adhesive material by exposure; and permanently curing the first adhesive material by baking.

[0030] Wherein, the step of arranging the first adhesive material is performed between the active calibration steps, or is performed after the active calibration step is completed.

[0031] Compared with the prior art, the present invention has at least one of the following technical effects:

[0032] 1. The present invention can improve the mechanical strength and reliability of the second lens component black object (i.e., the second lens barrel).

[0033] 2. The present invention can improve the flatness of the glue spot area after the second lens component is assembled, thereby improving the yield of the optical lens or camera module.

[0034] 3. The present invention can avoid increasing the total optical length (TTL) of the camera module, which helps to miniaturize the camera module.

[0035] 4. The present invention can avoid increasing the height of the optical lens (ie, the size in the optical axis direction), which helps to miniaturize the camera module.

[0036] 5. The present invention can avoid or suppress the curvature of the second lens barrel caused by the second lens group being separated, thereby avoiding or suppressing product defects or reduced imaging quality caused by inaccurate pre-positioning of the second lens component.

[0037] 6. The present invention can avoid or suppress the curvature of the second lens barrel caused by the second lens group being separated, thereby avoiding or suppressing the active calibration process from consuming too much time due to inaccurate pre-positioning of the second lens component. Therefore, the present invention can improve production efficiency.

[0038] 7. The present invention can better resist the variation of the imaging quality of the optical lens caused by environmental factors such as baking, exposure, humidity, etc. during the production process or long-term use by thickening the top of the second lens barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Exemplary embodiments are shown in the referenced drawings. The embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

[0040] Figure 1 A cross-sectional schematic diagram of an optical lens 1000 according to an embodiment of the present invention is shown;

[0041] Figure 2 An optical lens of a comparative example is shown;

[0042] Figure 3A partial enlarged view of the area around the top of the second lens barrel in one embodiment of the present invention is shown;

[0043] Figure 4A The relative position adjustment method in active calibration in one embodiment of the present invention is shown;

[0044] Figure 4B shows the rotation adjustment in active calibration of another embodiment of the present invention;

[0045] Figure 4C A relative position adjustment method with added v and w direction adjustments in active calibration of yet another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0046] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It should be noted that in this specification, the expressions of first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teaching of this application, the first subject discussed below can also be referred to as the second subject.

[0048] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0049] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0050] As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation, not degree, and are intended to account for the inherent variations in measurements or calculations that would be recognized by those of ordinary skill in the art.

[0051] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0052] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0053] Figure 1 FIG. 1 is a cross-sectional schematic diagram of an optical lens 1000 according to an embodiment of the present invention. Figure 1 As shown, the optical lens 1000 of the present embodiment includes a first lens component 100, a second lens component 200 and a first adhesive material 300. The first lens component 100 includes a first lens group, and the first lens group includes at least one first lens 102. The second lens component 200 includes a second lens barrel 201 and a second lens group installed in the second lens barrel 201, and the second lens group includes at least one second lens 202, and the first lens group and the second lens group together constitute an imageable optical system. The first adhesive material 300 is arranged between the second lens component 200 and the first lens component 100, and the first adhesive material 300 is suitable for supporting and fixing the first lens component 100 and the second lens component 200 after curing, so that the relative position of the above two is maintained at the relative position determined by active calibration. The second lens barrel 201 has an outer top surface 2011 and an inner top surface 2012, and the second lens group is supported by the inner top surface 2012. The outer top surface 2011 includes a rubber surface 2011a suitable for arranging the first rubber material 300 and an extension surface 2011b formed by extending from the rubber surface 2011a to the central axis of the second lens barrel 201. In this embodiment, the extension surface 2011b is not arranged with the first rubber material 300. The rubber surface 2011a to the inner top surface 2012 has a first thickness, and the extension surface 2011b to the inner top surface 2012 has a second thickness, and the first thickness is greater than the second thickness. Active calibration is to adjust the relative position of the first lens component 100 and the second lens component 200 based on the imaging result of the optical system to determine the relative position (referring to the relative position of the first lens component 100 and the second lens component 200) that can make the imaging quality meet the standard. For ease of understanding, active calibration will be further described below.

[0054] In the above embodiment, by making the first thickness greater than the second thickness, the top 209 of the second lens barrel 201 can be thickened, especially the portion of the top 209 of the second lens barrel 201 corresponding to the cloth adhesive surface 2011a can be thickened, thereby improving the structural strength of the top 209 of the second lens barrel, thereby suppressing the variation of the optical system performance due to the deformation of the sky surface (i.e., the outer top surface 2011 of the second lens barrel 201). In addition, the above embodiment can also enhance the ability of the portion of the top 209 of the second lens barrel 201 corresponding to the extension surface 2011b to resist deformation when being squeezed by the second lens (for example, when the second lens is embedded in the second lens barrel to assemble into a second lens group).

[0055] For ease of understanding, a comparative example is introduced below for illustration. Figure 2 An optical lens of a comparative example is shown. Figure 2 The optical lens of the comparative example includes a first lens component 100, a second lens component 200 and a first adhesive material 300. Figure 1 In the comparative example, the outer top surface 2011 of the second lens barrel 201 is a plane, and the top 209 of the second lens barrel 201 is not made as Figure 1 The thickening treatment shown. During assembly, the second lens 202 is loaded into the second lens barrel 201 to assemble the second lens group. The thinner top surface may not be able to bear the load and bulge outward, causing the top surface to deform. In this way, the upper surface of the second lens component 200 forms an arc surface. In the typical assembly process of the optical lens, it is necessary to perform multi-point height measurement on the upper surface of the second lens component 200 to pre-position the first lens component 100 and the second lens component 200. However, if the upper surface of the second lens component 200 is an arc surface, the measured position will have a deviation, resulting in the inability to obtain an accurate pre-positioning position (according to the design, the top surface of the lower group (i.e., the second lens group) is processed as a plane, and the laser distance measurement measures more than three points to fit a plane, and the fitting plane is used as the position of the top surface), thereby affecting the product yield. On the other hand, in a multi-group lens, adhesive is applied between the lens barrels of the upper and lower lens components to make them a complete optical system. However, during the production process, the lens may be exposed or baked for a short period of time, and during use, it may be under various temperature and humidity conditions for a long time. These situations may cause certain changes in the shape of the glue material, and the thermal stress generated by the heating of the lens and the lens barrel itself may also cause certain deformation, resulting in the variation of the optical system performance. The variation in the production process affects the product yield and increases the cost, and the variation in the use process affects the product reliability and life. In the comparative example, the thinner top 209 of the second lens barrel 201 is difficult to resist the variation factors in the above-mentioned production process or in the use process, which may cause the sky surface to continue to deform, causing the variation of the optical system performance, affecting the reliability and yield of the optical lens.

[0056] and Figure 1 In the embodiment, by thickening the top 209 of the second lens barrel 201, especially thickening the portion of the top 209 of the second lens barrel 201 corresponding to the rubber surface 2011a, the structural strength of the top surface (i.e., the outer top surface 2011 of the second lens barrel 201) can be improved, thereby increasing the accuracy of pre-positioning and enabling the optical lens to better resist the variation of the optical system performance caused by various inducements during the production process or during use. On the other hand, Figure 1 In the embodiment, it is possible to avoid increasing the total optical length (ie, TTL) of the optical lens by thickening the top 209 of the second lens barrel 201 as a whole, thereby facilitating miniaturization of the optical lens and the camera module.

[0057] Further, Figure 3 FIG. 1 shows a partial enlarged view of the top peripheral area of ​​the second lens barrel in one embodiment of the present invention, and FIG. Figure 1 and Figure 3 In one embodiment of the present invention, a transition surface 2011c is provided between the adhesive surface 2011a and the extension surface 2011b. The transition surface 2011c is an inclined surface. Designing the transition surface 2011c as an inclined surface facilitates demolding of the second lens barrel during the molding process, thereby improving the yield rate. In this embodiment, the angle between the transition surface and the central axis of the second lens barrel is 30°-85°. The adhesive surface 2011a is a flat surface. The inner top surface 2012 includes a supporting surface that supports the second lens group and a non-supporting surface that does not support the second lens group, the supporting surface having a first end A close to the central axis and a second end B away from the central axis, and, in the radial direction, one end D of the transition surface 2011c connected to the extension surface 2011b is located between the first end A and the second end B, wherein the radial direction is a direction perpendicular to the central axis (i.e. Figure 3 In other words, in this embodiment, the area of ​​the top 209 of the second lens barrel 201 used to support the second lens group is thickened to suppress the deformation of the sky surface. In this embodiment, the transition surface 2011c is set at a position that does not interfere with the light emission of the first lens group.

[0058] Furthermore, still in combination with reference Figure 1 and Figure 3In one embodiment of the present invention, there is a midpoint C between the first end A and the second end B. Moreover, in the radial direction, one end D of the transition surface 2011c connected to the extension surface 2011b overlaps with the midpoint C in a top-view angle, or is located closer to the central axis of the second lens barrel 201 than the midpoint C. In other words, there is a first radial distance (radial distance, i.e., the distance between the end D of the transition surface 2011c connected to the extension surface 2011b and the third end E on the outer top surface 2011 overlapping with the second end B of the inner top surface 2012 (referring to the overlap in the top-view direction) . Figure 1 The first end A has a second radial distance from the second end B. The first radial distance is at least greater than half of the second radial distance. In this embodiment, the bearing strength of the top 209 of the second lens barrel 201 against the first lens of the lower group can be further strengthened to prevent the top surface of the second lens barrel 201 from convex when the second lens 202 is assembled.

[0059] Furthermore, still in combination with reference Figure 1 and Figure 3 In one embodiment, in the axial direction, the distance from the adhesive surface 2011a to the extension surface 2011b is at least 50 microns, and the axial direction is a direction parallel to the central axis of the second lens barrel 202. In other words, the adhesive surface 2011a is at least 50 microns higher than the extension surface 2011b.

[0060] Further, refer to Figure 1 In one embodiment of the present invention, the first lens component 100 further includes a first lens barrel 101, and the first lens group is installed in the first lens barrel 101. It should be noted that in other embodiments of the present invention, the first lens barrel can be eliminated. For example, in one embodiment, the first lens group can be assembled by interlocking or bonding a plurality of first lenses 102. In another embodiment, a single first lens 102 can be used to form the first lens group.

[0061] Furthermore, in one embodiment, the inner side surface of the second lens barrel 201 has multiple steps, and the at least one second lens 202 is sequentially embedded in the multiple steps to assemble the second lens group.

[0062] Further, refer to Figure 1 and Figure 3In one embodiment of the present invention, the first lens group includes an optical zone and a structural zone surrounding the optical zone, and the bottom surface 1021 of the structural zone has a retracted surface 1021a that avoids the fabric adhesive surface 2011a. The retracted surface 1021a includes an inclined surface 1021b corresponding to the transition surface 2011c. In this embodiment, since the bottom surface of the first lens group structural zone avoids the retracted surface 1021a of the fabric adhesive surface 2011a, the increase of the total optical length (TTL) caused by the thickening of the top 209 of the second lens barrel 201 can be avoided, which is conducive to the miniaturization of the optical lens or the camera module. And, further, the thickness of the first lens barrel 101 (here, the thickness refers to the size along the optical axis or the central axis direction of the first lens barrel) can also be reduced to avoid the top 209 of the thickened second lens barrel 201, so that the first lens barrel and the second lens barrel have enough design gap in the thickness direction for active calibration. The thickness reduced by the first lens barrel 101 can be equal to the thickness increased by the top 209 of the second lens barrel 201. With reference to the description in the first embodiment above, it can be seen that the top 209 has the first thickness and the second thickness, and the difference between the first thickness and the second thickness can be regarded as the thickness increased by the top 209 of the second lens barrel 201.

[0063] Further, refer to Figure 1 In one embodiment of the present invention, the distance between the extension surface 2011b and the bottom surface of the first lens group is 30-150 microns.

[0064] Further, refer to Figure 1 In one embodiment of the present invention, the distance between the transition surface 2011c of the second lens barrel 201 and the inclined surface of the first lens group is at least twice the distance between the extension surface 2011b and the bottom surface of the first lens group, so as to meet the active clearance for adjusting the relative position of the first lens component 100 and the second lens component 200 during the active calibration process.

[0065] Further, refer to Figure 1 and Figure 3In one embodiment of the present invention, there is a first design distance and a second design distance between the first lens component 100 and the second lens component 200 to meet the active clearance for relative position adjustment of the first lens component 100 and the second lens component 200 during the active calibration process. The first design distance is at least twice the second design distance; the first design distance is: the design distance between the transition surface 2011c of the second lens barrel 201 and the inclined surface 1021b of the first lens group determined by the optical design of the optical system, and the second design distance is: the design distance between the extension surface 2011b and the bottom surface of the first lens group determined by the optical design of the optical system. In the finished optical lens, the relative position between the first lens component 100 and the second lens component 200 is determined by the active calibration result, so the above design distance may be different from the actual distance of the actual product. However, it is easy for those skilled in the art to understand that for the same batch of products under the same optical design, the actual distance will show a statistical law associated with the design distance, so as to judge whether the actual optical lens product has the feature that the first design distance is at least twice the second design distance.

[0066] Further, in one embodiment, since the relative positions of the first lens component 100 and the second lens component 200 are determined by active calibration, the optical axis of the first lens component 100 and the optical axis of the second lens component 200 may have a non-zero angle.

[0067] Further, according to one embodiment of the present invention, there is also provided a camera module, which includes a photosensitive component and an optical lens. The optical lens may be the optical lens described in any of the aforementioned embodiments. The optical lens may be installed in an optical actuator (e.g., a motor). For example, the optical lens may be installed on the inner side of a motor carrier to form an optical lens assembly with a motor, and the optical lens assembly may be installed on the top of the photosensitive component.

[0068] According to one embodiment of the present invention, there is also provided an optical lens assembly method, which comprises the following steps.

[0069] Step S100, preparing a first lens component 100 and a second lens component 200, wherein the first lens component 100 includes a first lens group, the first lens group includes at least one first lens 102, the second lens component 200 includes a second lens barrel 201 and a second lens group installed in the second lens barrel 201, the second lens group includes at least one second lens 202, the second lens barrel 201 has an outer top surface 2011 and an inner top surface 2012, the second lens group rests on the inner top surface 2012, the outer top surface 2011 includes a fabric adhesive surface 2011a and an extension surface 2011b extending from the fabric adhesive surface 2011a to the central axis of the second lens barrel 201, the fabric adhesive surface 2011a to the inner top surface 2012 has a first thickness, the extension surface 2011b to the inner top surface 2012 has a second thickness, and the first thickness is greater than the second thickness.

[0070] Step S200: pre-positioning the first lens component 100 and the second lens component 200 so that the first lens group and the second lens group together constitute an imageable optical system.

[0071] Step S300: Actively calibrate the relative positions of the first lens component 100 and the second lens component 200 based on the imaging result of the optical system.

[0072] Step S400 , bonding the first lens component 100 and the second lens component 200 , so that the relative positions of the two remain at the relative positions determined by the active calibration.

[0073] In one embodiment, in the preparation step (i.e., S100), the inner side surface of the second lens barrel 201 has multiple steps, and the preparation step (i.e., S100) further includes: inverting the second lens barrel 201, and then sequentially embedding the at least one second lens 202 into the multiple steps to assemble the second lens group.

[0074] In one embodiment, the pre-positioning step (i.e., S200) further includes: obtaining the positions of the first lens component 100 and the second lens component 200 by laser ranging, and then performing the pre-positioning, wherein the position of the second lens component 200 is obtained by performing laser ranging on the outer top surface 2011.

[0075] In one embodiment, the bonding step (i.e., S400) includes: arranging the first adhesive material 300 on the adhesive surface 2011a; and curing the first adhesive material 300 so that the relative positions of the first lens component 100 and the second lens component 200 are maintained at the relative positions determined by active calibration. The step of curing the first adhesive material 300 includes: pre-curing the first adhesive material 300 by exposure; and permanently curing the first adhesive material 300 by baking. The step of arranging the first adhesive material 300 is performed before the active calibration step, or after the active calibration step is completed (for example, after the active calibration is completed, the three-dimensional coordinate position of the first lens component 100 is recorded, and then the first lens component 100 is removed, and adhesive is applied to the outer top surface 2011 of the second lens barrel 201, and then the first lens component 100 is moved back according to the recorded three-dimensional coordinate position).

[0076] The following will further introduce the active calibration process used in the optical lens or camera module assembly method.

[0077] The active calibration described in the present application can adjust the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. Figure 4A The relative position adjustment method in active calibration in one embodiment of the present invention is shown. In this adjustment method, the first lens component 100 (or the first lens 101) can move relative to the second lens component 200 along the x, y, and z directions (that is, the relative position adjustment in this embodiment has three degrees of freedom). The z direction is the direction along the optical axis, and the x and y directions are the directions perpendicular to the optical axis. The x and y directions are both in an adjustment plane P, and the translation in the adjustment plane P can be decomposed into two components in the x and y directions.

[0078] Figure 4B FIG. 2 shows the rotation adjustment in active calibration of another embodiment of the present invention. In this embodiment, the relative position adjustment has Figure 4A In addition to the three degrees of freedom, a rotational degree of freedom, i.e., adjustment in the r direction, is added. In this embodiment, the adjustment in the r direction is a rotation within the adjustment plane P, i.e., a rotation around an axis perpendicular to the adjustment plane P.

[0079] Further, Figure 4CThe figure shows a relative position adjustment method with v and w direction adjustments added in the active calibration of another embodiment of the present invention. The v direction represents the rotation angle of the xoz plane, the w direction represents the rotation angle of the yoz plane, and the rotation angles of the v direction and the w direction can be synthesized into a vector angle, which represents the overall tilt state. In other words, by adjusting the v direction and the w direction, the tilt posture of the first lens component relative to the second lens component (that is, the tilt of the optical axis of the first lens component relative to the optical axis of the second lens component) can be adjusted.

[0080] The adjustment of the six degrees of freedom of x, y, z, r, v, and w may affect the imaging quality of the optical system (for example, the resolution). In other embodiments of the present invention, the relative position adjustment method may be to adjust only any one of the six degrees of freedom, or a combination of any two or more thereof.

[0081] Further, in one embodiment, in the active calibration step, the adjustment of the relative positions of the first lens component and the second lens component includes translation on the adjustment plane, that is, movement in the x and y directions.

[0082] Furthermore, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component 100 and the second lens component further includes: adjusting and determining the angle between the axis of the first lens component and the axis of the second lens component according to the measured resolution of the optical system, that is, the adjustment in the directions of w and v. In the assembled optical lens or camera module, the axis of the first lens component and the axis of the second lens component may have a non-zero angle.

[0083] Furthermore, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component also includes: moving the first lens component in a direction perpendicular to the adjustment plane (i.e., adjustment in the z direction), and determining the relative position between the first lens component and the second lens component in the direction perpendicular to the adjustment plane according to the measured resolution of the optical system.

[0084] Further, in one embodiment, the first lens component may not have a first lens barrel. For example, the first lens component may be composed of a single first lens. Before active calibration, corresponding pre-positioning is first performed so that there is a gap between the bottom surface of the first lens and the top surface of the second lens component; then active calibration is performed, and then the adhesive is arranged in the gap and the adhesive is cured. In this embodiment, the first lens may be formed by a plurality of sub-lenses that are interlocked or bonded to form an integral body. In this embodiment, the side and top surfaces of the non-optical surface of the first lens that are not used for imaging may form a shading layer. The shading layer may be formed by screen printing a shading material on the side and top surfaces of the first lens.

[0085] In one embodiment, in the active calibration step, the second lens component can be fixed, the first lens component can be clamped by a fixture, and the first lens component can be moved under the drive of a six-axis motion mechanism connected to the fixture, so as to achieve the relative movement of the first lens component and the second lens component in the above six degrees of freedom. The fixture can be supported or partially supported on the side of the first lens component, so as to clamp the first lens component and perform multi-degree-of-freedom position adjustment.

[0086] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. An optical lens, characterized in that: include: A first lens component, comprising a first lens group, wherein the first lens group comprises at least one first lens; A second lens component, comprising a second lens barrel and a second lens group installed in the second lens barrel, wherein the second lens group comprises at least one second lens, and the first lens group and the second lens group together constitute an imageable optical system, wherein the second lens barrel has an outer top surface and an inner top surface, and the second lens group rests on the inner top surface; as well as a first adhesive material, which is arranged between the outer top surface and the bottom surface of the first lens component, and the first adhesive material is suitable for supporting and fixing the first lens component and the second lens component after curing so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by the active calibration, The outer top surface includes a rubber cloth surface suitable for arranging the first rubber material and an extension surface formed by extending from the rubber cloth surface to the central axis of the second lens barrel, the rubber cloth surface is a flat surface, the rubber cloth surface to the inner top surface has a first thickness, the extension surface to the inner top surface has a second thickness, and the first thickness is greater than the second thickness. A transition surface is provided between the cloth rubber surface and the extension surface, the inner top surface includes a bearing surface that bears against the second lens group and a non-bearing surface that does not bear against the second lens group, the bearing surface has a first end close to the central axis and a second end facing away from the central axis, and, in a radial direction, one end of the transition surface connected to the extension surface is located between the first end and the second end, wherein the radial direction is a direction perpendicular to the central axis.

2. The optical lens according to claim 1, characterized in that: The first adhesive material is not disposed on the extension surface.

3. The optical lens according to claim 1, characterized in that: The transition surface is an inclined surface, and the included angle between the transition surface and the central axis of the second lens barrel is 30°-85°.

4. The optical lens according to claim 1, characterized in that: There is a midpoint between the first end and the second end; and in the radial direction, one end of the transition surface connected to the extension surface is located at the midpoint, or at a position closer to the central axis than the midpoint.

5. The optical lens according to claim 1, characterized in that: In the axial direction, the distance from the rubber surface to the extension surface is at least 50 micrometers, and the axial direction is a direction parallel to the central axis.

6. The optical lens according to claim 1, characterized in that: The first lens component further includes a first lens barrel, and the first lens group is installed in the first lens barrel.

7. The optical lens according to claim 6, characterized in that: The first lens group includes an optical zone and a structural zone surrounding the optical zone, and a bottom surface of the structural zone has an indented surface for avoiding the fabric adhesive surface.

8. The optical lens according to claim 7, characterized in that: The setback surface includes an inclined surface corresponding to the transition surface.

9. The optical lens according to claim 1, characterized in that: The distance between the extension surface and the bottom surface of the first lens group is 30-150 microns.

10. The optical lens according to claim 8, characterized in that: The distance between the transition surface of the second lens barrel and the inclined surface of the first lens group is at least twice the distance between the extension surface and the bottom surface of the first lens group.

11. The optical lens according to claim 8, characterized in that: There is a first design distance and a second design distance between the first lens component and the second lens component, and the first design distance is at least twice the second design distance; the first design distance is: the design distance between the transition surface of the second lens barrel and the inclined surface of the first lens group determined by the optical design of the optical system, and the second design distance is: the design distance between the extension surface and the bottom surface of the first lens group determined by the optical design of the optical system.

12. The optical lens according to claim 1, characterized in that: An optical axis of the first lens component and an optical axis of the second lens component have a non-zero angle therebetween.

13. The optical lens according to claim 1, characterized in that: The inner side surface of the second lens barrel has a plurality of steps, and the at least one second lens is sequentially embedded in the plurality of steps to form the second lens group.

14. A camera module, characterized in that: An optical lens comprising any one of claims 1-13.

15. An optical lens assembly method, characterized in that: include: Prepare a first lens component and a second lens component, wherein the first lens component includes a first lens group, the first lens group includes at least one first lens, the second lens component includes a second lens barrel and a second lens group installed in the second lens barrel, the second lens group includes at least one second lens, the second lens barrel has an outer top surface and an inner top surface, the second lens group is supported by the inner top surface, the outer top surface includes a fabric adhesive surface and an extension surface formed by extending from the fabric adhesive surface to the central axis of the second lens barrel, the fabric adhesive surface has a first thickness to the inner top surface, the extension surface has a second thickness to the inner top surface, and the first thickness is greater than the second thickness, a transition surface is provided between the fabric adhesive surface and the extension surface, the inner top surface includes a supporting surface supporting the second lens group and a non-supporting surface not supporting the second lens group, the supporting surface has a first end close to the central axis and a second end away from the central axis, and, in a radial direction, one end of the transition surface connected to the extension surface is located between the first end and the second end, wherein the radial direction is a direction perpendicular to the central axis; Pre-positioning the first lens component and the second lens component so that the first lens group and the second lens group together form an imageable optical system; Actively calibrating the relative positions of the first lens component and the second lens component based on an imaging result of the optical system; as well as The first lens component and the second lens component are bonded so that the relative positions of the two are maintained at the relative positions determined by the active calibration.

16. The optical lens assembly method according to claim 15, characterized in that: In the preparation step, the inner side surface of the second lens barrel has a plurality of steps, The preparation step further includes: inverting the second lens barrel, and then sequentially embedding the at least one second lens into the multiple steps to assemble the second lens group.

17. The optical lens assembly method according to claim 16, characterized in that: The pre-positioning step also includes: obtaining the positions of the first lens component and the second lens component by laser ranging, and then performing the pre-positioning, wherein the position of the second lens component is obtained by performing laser ranging on the outer top surface.

18. The optical lens assembly method according to claim 17, characterized in that: The bonding step comprises: Arranging a first adhesive material on the adhesive surface of the fabric; and The first adhesive material is cured so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by active calibration.

19. The optical lens assembly method according to claim 18, characterized in that: The step of curing the first adhesive material comprises: Pre-curing the first glue material by exposure; and The first adhesive material is permanently cured by baking.

20. The optical lens assembly method according to claim 18, characterized in that: The step of arranging the first adhesive material is performed before the active calibration step, or after the active calibration step is completed.

21. A camera module assembly method, characterized in that: include: Assembling an optical lens according to the optical lens assembly method according to any one of claims 15 to 20; as well as A camera module is assembled based on the optical lens.

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