阅读说明：本技术 光学镜头、摄像模组及组装方法 (Optical lens, camera module and assembling method ) 是由 田中武彦 陈烈烽 刘林 刘春梅 于 2018-08-30 设计创作，主要内容包括：本发明提供了一种光学镜头,包括：第一镜头部件、第二镜头部件以及第一胶材。第一镜头部件的第一镜片群和第二镜头部件的第二镜片群共同构成可成像的光学系统,其中第二镜头部件的第二镜筒具有外顶面和内顶面,所述第二镜片群承靠于所述内顶面。其中,所述外顶面包括适于布置所述第一胶材的布胶面和自所述布胶面向所述第二镜筒的中轴延伸而形成的延伸面,所述布胶面至所述内顶面具有第一厚度,所述延伸面至所述内顶面具有第二厚度,并且所述第一厚度大于所述第二厚度。本发明还提供了相应的摄像模组以及组装方法。本发明可以提升第二镜头部件黑物的机械强度与可靠性；可以提升光学镜头或摄像模组的良率；有助于摄像模组的小型化。(The present invention provides an optical lens comprising: the lens comprises a first lens part, a second lens part and a first rubber material. The first lens group of the first lens component and the second lens group of the second lens component jointly form an imaging optical system, wherein the second lens barrel of the second lens component is provided with an outer top surface and an inner top surface, and the second lens group is supported against the inner top surface. The outer top surface comprises a glue spreading surface and an extension surface, the glue spreading surface is suitable for arranging the first glue material, the extension surface extends from the glue spreading surface to the central axis of the second lens barrel and is provided with a first thickness from the glue spreading surface to the inner top surface, the extension surface is provided with a second thickness from the extension surface to the inner top surface, and the first thickness is larger than the second thickness. The invention also provides a corresponding camera module and an assembling method. The invention can improve the mechanical strength and reliability of the black object of the second lens component; the yield of the optical lens or the camera module can be improved; contribute to making a video recording the miniaturization of the die set.)

1. An optical lens, comprising:

a first lens component comprising a first lens group comprising at least one first lens;

the second lens component comprises a second lens barrel and a second lens group arranged in the second lens barrel, the second lens group comprises at least one second lens, and the first lens group and the second lens group jointly form an imaging optical system, wherein the second lens barrel is provided with an outer top surface and an inner top surface, and the second lens group is supported against the inner top surface; and

a first rubber disposed between the outer top surface and the bottom surface of the first lens component and adapted to support and secure the first lens component and the second lens component after curing to maintain their relative positions in a relative position determined by active calibration,

the outer top surface comprises a glue spreading surface and an extension surface, the glue spreading surface is suitable for arranging the first glue material, the extension surface extends from the glue spreading surface to the central axis of the second lens barrel and is provided with a first thickness from the glue spreading surface to the inner top surface, the extension surface is provided with a second thickness from the extension surface to the inner top surface, and the first thickness is larger than the second thickness.

2. An optical lens according to claim 1, characterized in that the first glue material is not arranged on the extension surface.

3. An optical lens according to claim 1, characterized in that a transition surface is provided between the rubberized surface and the extended surface.

4. An optical lens according to claim 3, wherein the transition surface is a slope, and the included angle between the transition surface and the central axis of the second barrel is 30-85 °.

5. An optical lens according to claim 1, wherein the rubberized surface is a flat surface.

6. An optical lens element according to claim 3, characterized in that the inner top surface comprises a bearing surface bearing against the second lens group and a non-bearing surface not bearing against the second lens group, the bearing surface having a first end close to the central axis and a second end facing away from the central axis, and that the end of the transition surface connecting the extension surfaces is located at a position between the first end and the second end in a radial direction, wherein the radial direction is a direction perpendicular to the central axis.

7. An optical lens according to claim 6, characterized in that the first end and the second end have a midpoint therebetween; and, in the radial direction, an end of the transition surface connecting the extension surface is located at the midpoint, or at a position closer to the central axis than the midpoint.

8. An optical lens according to claim 1, characterized in that the distance of the rubberized face to the extended face is at least 50 micrometers in an axial direction, which is a direction parallel to the central axis.

9. An optical lens assembly as recited in claim 3, wherein the first lens component further includes a first barrel, the first lens group being mounted within the first barrel.

10. An optical lens according to claim 9, wherein 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 a receding surface that avoids the rubberizing surface.

11. An optical lens according to claim 10, characterized in that the indented surface comprises a bevel corresponding to the transition surface.

12. An optical lens according to claim 1, characterized in that the distance between the extended surface and the bottom surface of the first lens group is 30-150 μm.

13. An optical lens according to claim 11, wherein the distance between the transition surface of the second 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.

14. An optical lens assembly according to claim 11, wherein the first lens component and the second lens component have a first design distance and a second design distance therebetween, the first design distance being at least twice the second design distance; the first design distance is: a design distance between the transition surface of the second barrel and the inclined surface of the first lens group, which is determined by an optical design of the optical system, the second design distance being: a design distance between the extended surface and the bottom surface of the first lens group, which is determined by an optical design of the optical system.

15. An optical lens according to claim 1, characterized in that the optical axis of the first lens part and the optical axis of the second lens part have an angle different from zero.

16. The optical lens barrel according to claim 1, wherein the inner side surface of the second lens barrel has a plurality of steps, and the at least one second lens is sequentially inserted into the plurality of steps to assemble the second lens group.

17. A camera module, comprising the optical lens of any one of claims 1-16.

18. 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 is provided with an outer top surface and an inner top surface, the second lens group is supported against the inner top surface, the outer top surface comprises a glue distribution surface and an extension surface formed by extending from the glue distribution surface to a central axis of the second lens barrel, the glue distribution surface to the inner top surface is provided with a first thickness, the extension surface to the inner top surface is provided with a second thickness, and the first thickness is larger 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 jointly form an imaging 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 such that their relative positions remain at the relative positions determined by the active calibration.

19. An optical lens assembly method according to claim 18, wherein in the preparing step, an inner side surface of the second barrel has a plurality of steps,

the preparing step further comprises: and inverting the second lens barrel, and then sequentially embedding the at least one second lens into the multistage steps to assemble the second lens group.

20. An optical lens assembly method according to claim 19, wherein the pre-positioning step further comprises: and acquiring the positions of the first lens component and the second lens component through laser ranging, and further performing the pre-positioning, wherein the position of the second lens component is acquired through laser ranging of the outer top surface.

21. An optical lens assembly method according to claim 20, wherein the bonding step includes:

arranging a first rubber material on the cloth rubber surface; and

curing the first glue material to maintain the relative positions of the first lens component and the second lens component in the relative positions determined by the active calibration.

22. An optical lens assembly method according to claim 21, wherein the step of curing the first glue material comprises:

pre-curing the first glue material by exposure; and

and baking to permanently cure the first glue material.

23. An optical lens assembly method according to claim 21, wherein the step of disposing the first glue is performed between the active calibration steps or after the active calibration steps are completed.

24. A camera module assembly method is characterized by comprising the following steps:

an optical lens assembly method according to any one of claims 18 to 23, wherein the optical lens is assembled; and

and assembling a camera module based on the optical lens.

Technical Field

The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and an assembling method.

Background

Along with the development of terminals such as mobile phones and computers, users have a great deal of improvement on various requirements, and particularly along with the development of mobile phones, the pursuit of users on shooting quality enables manufacturers to develop personalized and customized camera modules, such as large apertures and wide angles, lenses for solving the problem of a large number of lenses caused by aberration, and the like. This is on the one hand an increasing complexity in optical design and on the other hand the reality is that the complex optical system is sensitive, which poses a challenge to the yield of the manufacture and the quality of the product. Because the optical system of a large-aperture and large-wide-angle camera module is sensitive, and the reliability of the manufacturing process and the verification process of the camera module is weaker than that of the conventional design, a lens with a better structure is needed.

On the other hand, in order to meet the more and more extensive market demands, a high-pixel, small-size, large aperture is an irreversible development trend of the existing camera module. However, the need to achieve high pixel, small size, large aperture in the same imaging mold is very difficult. For example, the compact development of mobile phones and the increase of the mobile phone screen occupation ratio make the space inside the mobile phone available for the front camera module smaller and smaller, and the market puts forward higher and higher demands on the imaging quality of the camera module.

In the field of compact camera modules (e.g., camera modules for mobile phones), the quality of the optical imaging lens and the manufacturing errors during the module packaging process often need to be considered. Specifically, in the manufacturing process of the optical imaging lens, factors affecting the lens resolving power come from errors in the respective elements and their assembly, errors in the thickness of the lens spacer elements, errors in the assembly fitting of the respective lenses, variations in the refractive index of the lens material, and the like. Because the factors influencing the resolution of the lens are very many and exist in a plurality of elements, the control of each factor has the limit of the manufacturing precision, if the precision of each element is simply improved, the improvement capability is limited, the improvement cost is high, and the increasingly improved imaging quality requirement of the market can not be met.

The applicant provides an assembling method for adjusting and determining the relative positions of an upper sub-lens and a lower sub-lens based on an active calibration process, and then bonding the upper sub-lens and the lower sub-lens together according to the determined relative positions so as to manufacture a complete optical lens or a camera module. The solution can improve the process capability index (CPK) of the optical lens or the camera module which is produced in large scale; the requirements on the precision and the assembly precision of each element of a material (such as a sub-lens or a photosensitive assembly for assembling an optical lens or a camera module) can be relaxed, so that the overall cost of the optical imaging lens and the camera module is reduced; can adjust the various aberrations of the module of making a video recording in real time at the equipment in-process, reduce the defective rate, reduction in production cost promotes the formation of image quality.

However, active calibration of the optical system of the lens is a new production process, and the actual mass production needs to consider many factors such as reliability, falling resistance, weather resistance and manufacturing cost of the optical lens and the camera module, and sometimes needs to face various non-measurable factors to cause yield reduction. The applicant believes that improving the structural reliability of optical lenses manufactured based on an active alignment process is an important direction for improving the imaging quality and yield of such optical lenses. Therefore, a solution capable of improving the structural reliability of an optical lens manufactured based on an active alignment process is urgently required.

Disclosure of Invention

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

According to an aspect of the present invention, there is provided an optical lens including: a first lens component comprising a first lens group comprising at least one first lens; the second lens component comprises a second lens barrel and a second lens group arranged in the second lens barrel, the second lens group comprises at least one second lens, and the first lens group and the second lens group jointly form an imaging optical system, wherein the second lens barrel is provided with an outer top surface and an inner top surface, and the second lens group is supported against the inner top surface; and a first rubber material arranged between the outer top surface and the bottom surface of the first lens component, wherein the first rubber material is suitable for supporting and fixing the first lens component and the second lens component after being solidified so as to keep the relative positions of the first lens component and the second lens component at the relative positions determined by the active calibration, the outer top surface comprises a rubber cloth surface suitable for arranging the first rubber material and an extending surface formed by extending from the rubber cloth surface to the central axis of the second lens cone, the rubber cloth surface to the inner top surface has a first thickness, the extending surface to the inner top surface has a second thickness, and the first thickness is larger than the second thickness.

Wherein the first glue material is not arranged on the extension surface.

Wherein, a transition surface is arranged between the cloth rubber surface and the extension surface.

The transition surface is an inclined surface, and the included angle between the transition surface and the middle axis of the second lens cone is 30-85 degrees.

Wherein, the cloth glue surface is a flat surface.

Wherein the interior 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 having a first end that is proximate to the central axis and a second end that faces away from the central axis, and an end of the transition surface that connects the extension surface is located at a position between the first end and the second end in a radial direction, wherein the radial direction is a direction perpendicular to the central axis.

Wherein the first end and the second end have a midpoint therebetween; and, in the radial direction, an end of the transition surface connecting the extension surface is located at the midpoint, or at a position closer to the central axis than the midpoint.

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

The first lens component further comprises a first lens barrel, and the first lens group is mounted in the first lens barrel.

The first lens group comprises an optical area and a structural area surrounding the optical area, and the bottom surface of the structural area is provided with a retraction surface avoiding the adhesive distribution surface.

Wherein the indented surface comprises a slope corresponding to the transition surface.

Wherein the distance between the extension surface and the bottom surface of the first lens group is 30-150 micrometers.

The distance between the transition surface of the second lens barrel and the inclined surface of the first lens group is at least twice as long as the distance between the extension surface and the bottom surface of the first lens group.

Wherein the first lens component and the second lens component have a first design distance and a second design distance therebetween, the first design distance being at least twice the second design distance; the first design distance is: a design distance between the transition surface of the second barrel and the inclined surface of the first lens group, which is determined by an optical design of the optical system, the second design distance being: a design distance between the extended surface and the bottom surface of the first lens group, which is determined by an optical design of the optical system.

And an included angle which is not zero is formed between the optical axis of the first lens component and the optical axis of the second lens component.

The inner side surface of the second lens barrel is provided with a plurality of steps, and the at least one second lens is sequentially embedded into the plurality of steps to form the second lens group.

The invention also provides a camera module which comprises any one of the optical lenses.

The invention also provides an optical lens assembly method, which comprises the following steps: 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 is provided with an outer top surface and an inner top surface, the second lens group is supported against the inner top surface, the outer top surface comprises a glue distribution surface and an extension surface formed by extending from the glue distribution surface to a central axis of the second lens barrel, the glue distribution surface to the inner top surface is provided with a first thickness, the extension surface to the inner top surface is provided with a second thickness, and the first thickness is larger 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 jointly form an imaging 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 first lens component and the second lens component are maintained at the relative positions determined by the active calibration.

Wherein, in the preparing step, the inner side surface of the second barrel has a plurality of steps, and the preparing step further includes: and inverting the second lens barrel, and then sequentially embedding the at least one second lens into the multistage steps to assemble the second lens group.

Wherein the pre-positioning step further comprises: and acquiring the positions of the first lens component and the second lens component through laser ranging, and further performing the pre-positioning, wherein the position of the second lens component is acquired through laser ranging of the outer top surface.

Wherein the bonding step comprises: arranging a first rubber material on the cloth rubber surface; and curing the first glue material to maintain the relative positions of the first lens component and the second lens component in the relative positions determined by the active calibration.

Wherein the step of curing the first glue material comprises: pre-curing the first glue material by exposure; and permanently curing the first glue material by baking.

Wherein the step of arranging the first glue material is performed between the active calibration steps or after the active calibration steps are completed.

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

1. the invention can improve the mechanical strength and reliability of the second lens component black object (namely the second lens barrel).

2. The invention can improve the flatness of the dispensing area after the second lens component is assembled, thereby improving the yield of the optical lens or the camera module.

3. The invention can avoid increasing the total optical length (TTL) of the camera module and is beneficial to the miniaturization of the camera module.

4. The invention can avoid increasing the height of the optical lens (namely the size in the optical axis direction), and is beneficial to the miniaturization of the camera module.

5. The invention can avoid or restrain the bending of the second lens cone caused by the assembly of the second lens group, thereby avoiding or restraining the bad products or the reduced imaging quality caused by the inaccurate prepositioning of the second lens component.

6. The invention can avoid or restrain the second lens cone surface curvature caused by the second lens group, and further avoid or restrain the active calibration process from consuming too much time due to inaccurate pre-positioning of the second lens component, thereby improving the production efficiency.

7. The invention can better resist the variation of the imaging quality of the optical lens caused by environmental factors in the production process of baking, exposure, moisture and the like or the long-term use process by thickening the top of the second lens barrel.

Drawings

Exemplary embodiments are illustrated in referenced figures of the drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive.

FIG. 1 shows a schematic cross-sectional view of an optical lens 1000 of one embodiment of the invention;

fig. 2 shows an optical lens of a comparative example;

fig. 3 shows a partially enlarged view of a region around the top of the second barrel in one embodiment of the present invention;

FIG. 4A illustrates a relative position adjustment in active calibration in one embodiment of the present invention;

FIG. 4B illustrates rotational adjustment in active calibration according to another embodiment of the present invention;

fig. 4C shows a relative position adjustment with added v, w direction adjustments in an active calibration according to yet another embodiment of the present invention.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that the expressions first, second, etc. in this specification are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.

In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

As used herein, the terms "substantially," "about," and the like are used as terms of table approximation and not as terms of table degree, and are intended to account for inherent deviations in measured or calculated values that will be recognized by those of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Fig. 1 shows a schematic cross-sectional view of an optical lens 1000 according to an embodiment of the invention. As shown in fig. 1, an optical lens 1000 of the present embodiment includes a first lens component 100, a second lens component 200, and a first plastic 300. Wherein the first lens component 100 comprises a first lens group comprising at least one first lens 102. The second lens component 200 includes a second barrel 201 and a second lens group installed in the second barrel 201, the second lens group includes at least one second lens 202, and the first lens group and the second lens group together form an imageable optical system. The first glue 300 is arranged between the second lens component 200 and the first lens component 100, and said first glue 300 is adapted to support and fix said first lens component 100 and said second lens component 200 after curing, so as to keep their relative positions in a relative position determined by active calibration. The second 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 glue spreading surface 2011a adapted to arrange the first glue material 300 and an extending surface 2011b extending from the glue spreading surface 2011a to a central axis of the second barrel 201. In this embodiment, the first rubber material 300 is not disposed on the extended surface 2011 b. The glue spreading surface 2011a to the inner top surface 2012 have a first thickness, the extending surface 2011b to the inner top surface 2012 have a second thickness, and the first thickness is greater than the second thickness. The active calibration is to adjust the relative positions of the first lens part 100 and the second lens part 200 based on the imaging result of the optical system to determine the relative positions (referring to the relative positions of the first lens part 100 and the second lens part 200) that can meet the imaging quality. For ease of understanding, active calibration is further described below.

In the above embodiment, by making the first thickness larger than the second thickness, the top 209 of the second barrel 201 can be thickened, especially, the part of the top 209 of the second barrel 201 corresponding to the glue spreading surface 2011a is thickened, so as to improve the structural strength of the top 209 of the second barrel, and further suppress the variation of the optical system performance due to the deformation of the zenith surface (i.e., the outer top surface 2011 of the second barrel 201). In addition, the above-described embodiment can also enhance the ability of the portion of the top 209 of the second barrel 201 corresponding to the extended surface 2011b to resist deformation when being pressed by the second lens (e.g., when the second lens is inserted into the second barrel to be assembled into the second lens group).

For ease of understanding, a comparative example is introduced below for illustration. Fig. 2 shows an optical lens of a comparative example. Referring to fig. 2, the optical lens of this comparative example includes a first lens part 100, a second lens part 200, and a first plastic 300. Unlike the embodiment of fig. 1, in the comparative example, the outer top surface 2011 of the second barrel 201 is a flat surface, and the top 209 of the second barrel 201 is not thickened as shown in fig. 1. When assembling, the second lens 202 is inserted into the second barrel 201 to assemble the second lens group, and the thin top surface may not be able to bear the load and protrude outward, so that the top surface deforms. Thus, the upper surface of the second lens part 200 forms an arc-shaped surface. In a typical optical lens assembly process, the upper surface of the second lens part 200 needs to be multi-leveled to pre-position the first lens part 100 and the second lens part 200. However, if the upper surface of the second lens part 200 is an arc surface, the measured position may be deviated, so that an accurate pre-positioning position cannot be obtained (according to design, the lower group (i.e., the second lens group) is processed by a plane, the laser ranging is performed to measure a fit plane of three or more points, and the fit plane is used as the position of the top surface), thereby affecting the yield of products. On the other hand, in the multi-group lens, the lens barrels of the upper and lower lens parts are bonded by applying a glue material, so that a complete optical system is formed. However, during production, the lens may be exposed or baked for a short period of time, and during use, the lens may be exposed to various temperature and humidity conditions for a long period of time. Under these conditions, the shape of the plastic material may change to some extent, and the thermal stress generated by the lens and the lens barrel itself due to heating may also cause some deformation, resulting in the variation of the performance of the optical system. Variations in the production process affect product yield and increase cost, and variations in the use process affect product reliability and life. In the comparative example, the thin top 209 of the second barrel 201 is difficult to resist the variation factors during the production process or the use process, which may cause the skyhook to continue to deform, resulting in the variation of the performance of the optical system and affecting the reliability and yield of the optical lens.

In the embodiment of fig. 1, the top 209 of the second barrel 201 is thickened, and particularly, the part of the top 209 of the second barrel 201 corresponding to the glue spreading surface 2011a is thickened, so that the structural strength of the zenith surface (i.e., the outer top surface 2011 of the second barrel 201) can be improved, the accuracy of pre-positioning is increased, and the optical lens better resists the performance variation of the optical system caused by various inducements in the production process or the use process. On the other hand, in the embodiment of fig. 1, the increase of the total optical length (i.e., TTL) of the optical lens system due to the integral thickening of the top portion 209 of the second barrel 201 can be avoided, thereby contributing to the miniaturization of the optical lens system and the camera module.

Further, fig. 3 shows a partially enlarged view of a region around the top of the second barrel in an embodiment of the present invention, and with reference to fig. 1 and 3, in an embodiment of the present invention, a transition surface 2011c is provided between the glue applying surface 2011a and the extending surface 2011 b. The transition surface 2011c is a slope. The design of the transition surface 2011c as a slope facilitates demolding of the second barrel in a molding process, thereby improving yield. In this embodiment, an included angle between the transition surface and the central axis of the second barrel is 30 ° to 85 °. The adhesive dispensing surface 2011a is a flat surface. The interior top surface 2012 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 surfaces have a first end a that is close to the central axis and a second end B that faces away from the central axis, and an end D of the transition surface 2011c that is connected to the extension surface 2011B is located at a position between the first end a and the second end B in a radial direction, wherein the radial direction is a direction perpendicular to the central axis (i.e., a horizontal direction in fig. 3). In other words, in the present embodiment, the region of the top 209 of the second barrel 201 for bearing against the second lens group is thickened, thereby suppressing deformation of the zenith surface. In this embodiment, the transition surface 2011c is disposed at a position that does not interfere with the exit of the light from the first lens group.

Further, still referring to fig. 1 and 3 in combination, in one embodiment of the present invention, the first end a and the second end B have a midpoint C therebetween. In the radial direction, one end D of the transition surface 2011C connected to the extension surface 2011b overlaps the midpoint C in a plan view, or is located closer to the central axis of the second barrel 201 than the midpoint C. In other words, a third end E of the transition surface 2011c, which connects one end D of the extension surface 2011B to the outer top surface 2011 and overlaps with the second end B of the inner top surface 2012 (i.e., overlaps in the top view direction), has a first radial distance (i.e., a distance in the horizontal direction in fig. 1), and the first end a has a second radial distance to the second end B. The first radial distance is at least greater than half the second radial distance. In this embodiment, the bearing strength of the top 209 of the second barrel 201 on the first lens of the next group can be further enhanced, and the top surface of the second barrel 201 is prevented from protruding upwards when the second lens 202 is assembled.

Further, still referring to fig. 1 and 3 in combination, in one embodiment, the distance from the rubberized surface 2011a to the extended surface 2011b is at least 50 micrometers in an axial direction, which is a direction parallel to the central axis of the second barrel 202. In other words, the cloth rubber surface 2011a is at least 50 micrometers higher than the extension surface 2011 b.

Further, referring to fig. 1, in an embodiment of the present invention, the first lens part 100 further includes a first barrel 101, and the first lens group is mounted in the first barrel 101. Note that in other embodiments of the present invention, the first barrel may be eliminated. For example, in one embodiment, the first lens group can be assembled by fitting or adhering the first lenses 102 to each other. In another embodiment, a single first lens 102 may be used to form the first lens group.

Further, in one embodiment, the inner side surface of the second barrel 201 has a plurality of steps, and the at least one second lens 202 is sequentially embedded into the plurality of steps to form the second lens group.

Further, referring to fig. 1 and 3, in an embodiment of the invention, the first lens group includes an optical area and a structural area surrounding the optical area, and a bottom surface 1021 of the structural area has a receding surface 1021a avoiding the rubberizing surface 2011 a. The indented surface 1021a includes a sloped surface 1021b that corresponds to the transition surface 2011 c. In this embodiment, since the bottom surface of the first lens group structure region is away from the indented surface 1021a of the rubberized surface 2011a, an increase in total optical length (TTL) due to thickening of the top 209 of the second barrel 201 can be avoided, which is beneficial to miniaturization of the optical lens or the camera module. And, further, the thickness of the first barrel 101 (here, the thickness refers to the dimension along the optical axis or the central axis direction of the first barrel) can be reduced to avoid the top 209 of the thickened second barrel 201, so that the first barrel and the second barrel have enough design clearance in the thickness direction for active alignment. The thickness absorbed by the first barrel 101 may be equal to the thickness added by the top 209 of the second barrel 201. Here, referring to the foregoing description of the first embodiment, it can be seen that the top portion 209 has the first thickness and the second thickness, and a difference between the first thickness and the second thickness can be regarded as an increased thickness of the top portion 209 of the second barrel 201.

Further, referring to fig. 1, in an embodiment of the present invention, the distance between the extended surface 2011b and the bottom surface of the first lens group is 30-150 μm.

Further, referring to fig. 1, in an embodiment of the present invention, a 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 as long as a distance between the extending surface 2011b and the bottom surface of the first lens group, so as to satisfy a movable gap for adjusting a relative position of the first lens component 100 and the second lens component 200 during the active calibration.

Further, referring to fig. 1 and fig. 3, in an embodiment of the present invention, the first lens component 100 and the second lens component 200 have a first design distance and a second design distance therebetween, so as to satisfy a movement gap for adjusting a relative position of the first lens component 100 and the second lens component 200 during the active calibration. Wherein the first design distance is at least twice the second design distance; the first design distance is: a design distance between the transition surface 2011c of the second barrel 201 and the inclined surface 1021b of the first lens group, which is determined by an optical design of the optical system, and the second design distance is: a design distance between the extended surface 2011b and the bottom surface of the first lens group, which is 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 design distance may be different from the actual distance of the actual product. However, it is easy to understand that for the same batch of products under the same optical design, the actual distance exhibits a statistical rule associated with the design distance, so as to determine whether the actual product of the optical lens has the characteristic that the first design distance is at least twice as long as the second design distance.

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 an included angle different from zero.

Further, according to an embodiment of the present invention, there is also provided a camera module including a photosensitive component and an optical lens. Wherein the optical lens may be the optical lens described in any of the previous embodiments. The optical lens may be mounted within an optical actuator (e.g., a motor). For example, the optical lens may be mounted to the inside surface of a motor carrier, forming a motorized optical lens assembly, which may be mounted on top of the photosensitive assembly.

There is also provided, in accordance with an embodiment of the present invention, an optical lens assembly method, including the following steps.

Step S100, preparing a first lens component 100 and a second lens component 200, where 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 barrel 201 and a second lens group installed in the second barrel 201, the second lens group includes at least one second lens 202, the second 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 rubberized surface 2011a and an extended surface 2011b formed by extending from the rubberized surface 2011a to a central axis of the second barrel 201, the rubberized surface 2011a to the inner top surface 2012 has a first thickness, the extended surface 2011b to the inner top surface 2012 has a second thickness, and the first thickness is greater than the second thickness.

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 form an imaging optical system.

Step S300, actively calibrating the relative position of the first lens component 100 and the second lens component 200 based on the imaging result of the optical system.

Step S400, bonding the first lens component 100 and the second lens component 200 so that their relative positions are maintained at the relative positions determined by the active calibration.

In one embodiment, the preparing step (i.e., S100) in which the inner side surface of the second barrel 201 has a plurality of steps further includes: the second lens barrel 201 is inverted, and then the at least one second lens 202 is sequentially embedded into the multi-step to assemble the second lens group.

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

In one embodiment, the bonding step (i.e., S400) includes: arranging a first rubber material 300 on the rubber distribution surface 2011 a; and curing the first glue material 300 to maintain the relative positions of the first lens component 100 and the second lens component 200 at the relative positions determined by the active calibration. Wherein the step of curing the first glue material 300 comprises: pre-curing the first glue material 300 by exposure; and permanently curing the first glue material 300 by baking. The step of disposing 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, then the first lens component 100 is removed, the adhesive is applied to the external top surface 2011 of the second barrel 201, and then the first lens component 100 is moved back according to the recorded three-dimensional coordinate position).

The active calibration process used in the method for assembling an optical lens or a camera module will be further described below.

The active calibration described herein allows for adjustment of the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. FIG. 4A illustrates a relative position adjustment in active calibration in one embodiment of the invention. In this adjustment manner, the first lens part 100 (or the first lens 101) can move along the x, y, and z directions relative to the second lens part 200 (i.e., the relative position adjustment in this embodiment has three degrees of freedom). Where the z-direction is the direction along the optical axis and the x, y-directions are the directions perpendicular to the optical axis. The x, y directions both lie in a tuning plane P within which translation can be resolved into two components in the x, y directions.

FIG. 4B illustrates rotational adjustment in active calibration according to another embodiment of the present invention. In this embodiment, the relative position adjustment has an increased rotational degree of freedom, i.e., adjustment in the r direction, in addition to the three degrees of freedom of fig. 4A. In the present embodiment, the adjustment in the r direction is a rotation in the adjustment plane P, i.e. a rotation around an axis perpendicular to the adjustment plane P.

Further, fig. 4C shows a relative position adjustment manner with v and w direction adjustments added in the active calibration according to yet another embodiment of the present invention. Where 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 may be combined into a vector angle representing the total tilt state. That is, by the v-direction and w-direction adjustment, the tilt posture of the first lens component with respect to the second lens component (i.e., the tilt of the optical axis of the first lens component with respect to the optical axis of the second lens component) can be adjusted.

The adjustment of the above-mentioned six degrees of freedom x, y, z, r, v, and w may affect the imaging quality of the optical system (e.g., affect the magnitude of the resolution). In other embodiments of the present invention, the relative position adjustment may be performed by adjusting only any one of the six degrees of freedom, or by a combination of any two or more of the six degrees of freedom.

Further, in an embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component comprises a translation in said adjustment plane, i.e. a movement in the x, y direction.

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component 100 and the second lens component further includes: and adjusting and determining an included angle of the axis of the first lens component relative to the axis of the second lens component, namely adjustment in the w and v directions according to the actually measured resolution force of the optical system. In the assembled optical lens or camera module, an included angle between the axis of the first lens component and the axis of the second lens component may be different from zero.

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component and the second lens component further includes: moving the first lens part in a direction perpendicular to the adjustment plane (i.e. adjustment in z-direction), determining a relative position between the first lens part and the second lens part in the direction perpendicular to the adjustment plane based on a measured resolution of the optical system.

Further, in one embodiment, the first lens component may not have a first barrel. For example, the first lens component may be constituted by a single first lens. Before active calibration, pre-positioning correspondingly to ensure that a gap is reserved between the bottom surface of the first lens and the top surface of the second lens component; and then carrying out active calibration, arranging the rubber material in the gap and solidifying the rubber material. In this embodiment, the first lens may be formed by a plurality of sub-lenses which are integrally formed by being fitted or bonded to each other. In this embodiment, the side surfaces and the top surface of the non-optical surface of the first lens not used for imaging may be formed with a light shielding layer. The light shielding layer may be formed by screen printing a light shielding material on the side surfaces and the top surface of the first lens.

In one embodiment, in the active calibration step, the second lens component may be fixed, the first lens component may be held by a clamp, and the first lens component may be moved by a six-axis movement mechanism connected to the clamp, so as to realize the relative movement between the first lens component and the second lens component in the above six degrees of freedom. The clamp can be supported against or partially supported against the side surface of the first lens component, so that the first lens component is clamped and position adjustment with multiple degrees of freedom is performed.

The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.