CN110542969A

CN110542969A - Optical lens, camera module and assembling method thereof

Info

Publication number: CN110542969A
Application number: CN201810532712.6A
Authority: CN
Inventors: 田中武彦; 蒋恒; 刘林; 褚水佳
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2018-05-29
Filing date: 2018-05-29
Publication date: 2019-12-06
Anticipated expiration: 2038-05-29
Also published as: CN110542969B

Abstract

The present invention provides an optical lens comprising: the first lens component comprises a first lens barrel and at least one first lens, the first lens comprises a first optical area and a first structural area, and the first lens positioned at the lowest part is a first bottom lens; a second lens component comprising a second barrel and at least one second lens, the at least one first lens and the at least one second lens together constituting an imageable optical system, and a bottom surface of the first structural region of the bottom first lens being lower than a top surface of the second barrel; and the connecting rubber material is positioned between the first lens part and the second lens part and is suitable for supporting the first lens part and the second lens part and fixing the relative position between the first lens part and the second lens part. The invention also provides a corresponding camera module and an assembling method. The invention can reduce the optical total length of the camera module, thereby reducing the height of the camera module; the imaging quality can be improved.

Description

Optical lens, camera module and assembling method thereof

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 thereof.

background

With the popularization of mobile electronic devices, technologies related to camera modules applied to mobile electronic devices for helping users to obtain images (e.g., videos or images) have been rapidly developed and advanced, and in recent years, camera modules have been widely applied to various fields such as medical treatment, security, industrial production, and the like.

In order to meet the increasingly wide market demands, a high-pixel, small-size and large-aperture diaphragm 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. The errors of each element and the assembly thereof comprise the errors of the optical surface thickness, the lens optical surface rise, the optical surface shape, the curvature radius, the single lens surface and the surface eccentricity, the lens optical surface inclination and the like of each lens monomer, and the sizes of the errors depend on the precision of the mold and the control capability of the molding precision. The error in the thickness of the lens spacing element depends on the machining accuracy of the element. The error of the fitting fit of each lens depends on the dimensional tolerance of the fitted components and the fitting accuracy of the lens. The error introduced by the change in refractive index of the lens material depends on the stability of the material and batch consistency. The errors of the above elements affecting the image resolution have cumulative deterioration, and the cumulative errors increase with the increase of the number of lenses. The existing resolution solution is to perform tolerance control on the sizes of the elements with high relative sensitivity and compensate for lens rotation to improve the resolution, but because a lens with high pixels and large aperture is sensitive, the tolerance is required to be strict, such as: the eccentricity of a part of sensitive lens 1um lens can bring about 9' image plane inclination, so that the processing and assembling difficulty of the lens is increased, and meanwhile, the feedback period is long in the assembling process, so that the process capability index (CPK) of lens assembling is low, the fluctuation is large, and the reject ratio is high. As described above, because there are many factors affecting the resolution of the lens, the factors exist in a plurality of elements, and the control of each factor has a limit to the manufacturing accuracy, and if the accuracy of each element is simply improved, the improvement capability is limited, the improvement cost is high, and the increasingly improved imaging quality requirements of the market cannot 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, to leave a space for active calibration, a certain gap is often required to be left in design between the bottom surface of the upper sub-lens and the top surface of the lower sub-lens, and this gap causes the height (referring to the dimension in the optical axis direction) of the lens based on the active calibration process to be often larger than that of a single lens (referring to a lens having only a single barrel). The excessive height of the lens or the camera module is often one of the important factors that restrict the size reduction (e.g., thickness reduction) of the terminal device (e.g., mobile phone).

on the other hand, 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. For example, in one process scheme, a glue material is filled between the first lens component and the second lens component to maintain the first lens component and the second lens component in relative positions determined by active calibration. However, in actual trial production, the imaging quality of the optical lens and the camera module is often degraded compared with that obtained in the active calibration stage, and the degradation sometimes exceeds the tolerance range, resulting in poor product. The applicant has found that, after an active calibration process is introduced to the assembly of an optical lens or a camera module, variations of a plastic material, a lens barrel or a lens and other unknown factors may be the causes of the above problems. There is a need for a solution that overcomes the above problems to improve product yield.

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 part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and the at least one first lens having a bottom first lens located at the lowermost side;

the second lens component comprises a second lens barrel and at least one second lens mounted on the second lens barrel, the at least one first lens and the at least one second lens jointly form an imaging optical system, and the bottom surface of the first structural area of the bottom first lens is lower than the top surface of the second lens barrel; and the connecting rubber material is positioned between the first lens part and the second lens part and is suitable for supporting the first lens part and the second lens part and fixing the relative position between the first lens part and the second lens part.

In one embodiment, the connecting rubber is adapted to support and fix the first lens component and the second lens component so as to keep the first lens component and the second lens component at relative positions determined by active calibration, and an included angle between an axis of the first lens component and an axis of the second lens component is not zero, wherein the active calibration is relative position adjustment of the first lens component and the second lens component according to an actual imaging result of the optical system.

in one embodiment, the connection rubber includes a first rubber located between a bottom surface of the first barrel and a top surface of the second barrel.

In one embodiment, the second lens comprises a second optical zone for imaging and a second structural zone outside the second optical zone, the at least one second lens having an uppermost one of the top second lenses; and the connecting rubber material further comprises a second rubber material which is positioned between a first bottom surface and a second top surface, wherein the first bottom surface is the bottom surface of the first structure area of the bottom first lens, and the second top surface is the top surface of the second structure area of the top second lens.

In one embodiment, the first piece of glue is adapted to temporarily support and fix the relative position of the first lens component and the second lens component after pre-curing, and the second piece of glue is adapted to permanently support and fix the relative position of the first lens component and the second lens component after curing.

in one embodiment, the first adhesive material is a light-curing adhesive, and the second adhesive material is a thermosetting adhesive.

In one embodiment, the first glue material and the second glue material are both UV thermosetting glue.

In one embodiment, the first bottom surface and the second top surface are both flat surfaces.

In one embodiment, the inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.

In one embodiment, the second glue material contacts the second lens barrel.

In one embodiment, the at least one second lens has a top second lens located uppermost, wherein at least one of the light exit surface of the bottom first lens and the light entrance surface of the top second lens is not convex.

In one embodiment, the second glue material does not contact the second lens barrel.

In one embodiment, the second structure region of the top second lens includes a bearing region and a bonding region, wherein the side and top surfaces of the bearing region bear against the stepped bearing surface, and the bonding region is disposed with the second glue material.

In one embodiment, the second top surface has an overflow groove, the overflow groove is located at one end of the second top surface close to the second optical area, and the second glue material is black.

In one embodiment, the first lens component is located at a front end of the optical lens and the second lens component is located at a rear end of the optical lens.

According to another aspect of the present invention, a camera module is further provided, which includes any one of the optical lenses described above.

According to another aspect of the present invention, there is also provided an optical lens assembling method including: preparing a first lens part and a second lens part, wherein the first lens part comprises a first lens barrel and at least one first lens mounted on the first lens barrel, the first lens comprises a first optical area for imaging and a first structural area outside the first optical area, and the at least one first lens has a bottom first lens positioned at the lowest position, and the second lens part comprises a second lens barrel and at least one second lens mounted on the second lens barrel; pre-positioning the first lens part and the second lens part so that the at least one first lens and the at least one second lens jointly form an imaging optical system, and the bottom surface of the first structure area of the first lens at the bottom is lower than the top surface of the second lens barrel; actively calibrating the relative positions of the first lens component and the second lens component based on the measured imaging result of the optical system; and bonding the first lens part and the second lens part by using a connecting rubber material so as to keep the first lens part and the second lens part at the relative position determined by the active calibration.

In one embodiment, the step of bonding with the connecting glue comprises: arranging the connecting rubber material on the top surface of the second lens component; moving the first lens component and the second lens component to relative positions determined by active calibration; and solidifying the connecting glue material.

In one embodiment, the step of performing the active calibration is performed first, and then the step of disposing the connecting glue is performed.

In one embodiment, the step of disposing the connecting rubber is performed first, and then the step of actively calibrating is performed.

in one embodiment, in the step of bonding with the connection rubber, the connection rubber includes a first rubber and a second rubber, and the step of arranging the connection rubber includes: and arranging a first adhesive material on the top surface of the second lens barrel, and arranging a second adhesive material on the second top surface, wherein the second top surface is the top surface of a second structure area of the top second lens, the top second lens is the uppermost one of the at least one second lens, and the second structure area is an area of the second lens except the optical area for optical imaging.

in one embodiment, in the step of bonding with a connecting adhesive material, the first adhesive material is located between the bottom surface of the first lens barrel and the top surface of the second lens barrel, and the second adhesive material is located between the second top surface and the first bottom surface, where the first bottom surface is the bottom surface of the first structure region of the bottom first lens.

In one embodiment, the step of curing the connecting glue material comprises: pre-curing the first rubber material to temporarily support and fix the relative positions of the first lens part and the second lens part; and permanently curing the second rubber material to permanently support and fix the relative positions of the first lens component and the second lens component.

in one embodiment, the pre-curing includes exposing the first glue material.

in one embodiment, the permanent curing includes a baking process of the pre-cured first and second lens components.

In one embodiment, in the preparing step, the inner side of the second barrel has a stepped bearing surface, and at least a part of the second top surface bears against the stepped bearing surface.

In one embodiment, the step of actively calibrating comprises: and the distance between the first bottom surface and the second top surface along the optical axis direction is enabled to be in the range of less than 80um for active calibration.

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

1. The invention can reduce the total optical length (TTL) of the camera module, thereby reducing the height of the camera module.

2. The split-type assembled optical lens based on active calibration can improve the imaging quality of the optical lens and the camera module, and is particularly suitable for compact camera modules (such as mobile phone camera modules).

3. In some embodiments of the present invention, the difficulty of the first lens and the second lens forming process is low, which is helpful to save cost and improve production efficiency.

4. In some embodiments of the present invention, the manufacturing process of the second lens component is mature, which can reduce the assembly tolerance of the second lens barrel and the second lens, thereby improving the imaging quality and the yield.

5. Some embodiments of the invention may suppress the degradation of imaging quality due to quadratic variation of the split-type assembled optical lens based on active calibration.

6. Some embodiments of the invention can inhibit or prevent the overflow glue from polluting the optical system, thereby improving the product yield.

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 longitudinal sectional view of an optical lens 1000 in a comparative example;

FIG. 2 shows a schematic longitudinal section of an optical lens according to an embodiment of the invention;

FIG. 3A shows a schematic longitudinal section of another embodiment of the invention;

FIG. 3B shows the top first lens 101 in the embodiment of FIG. 3A;

FIG. 4A shows a schematic longitudinal section of an optical lens of a further embodiment of the invention;

FIG. 4B shows the top first lens 101 in the embodiment of FIG. 4A;

FIG. 5A shows a schematic longitudinal section of an optical lens according to yet another embodiment of the invention;

FIG. 5B shows the top first lens 101 in the embodiment of FIG. 5A;

FIGS. 6A-D illustrate an optical lens assembly process according to one embodiment of the invention;

FIG. 7A illustrates a relative position adjustment in active calibration in one embodiment of the invention;

FIG. 7B illustrates rotational adjustment in active calibration according to another embodiment of the present invention;

FIG. 7C illustrates a relative position adjustment with added v, w direction adjustments in an active calibration according to yet another embodiment of the present invention;

FIG. 8 illustrates an auto focus module in one embodiment of the invention;

Fig. 9 shows an optical lens in an 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. 2 shows a schematic longitudinal section of an optical lens according to an embodiment of the invention. The longitudinal section in this context refers to a section through the optical axis and is not described in more detail below. Referring to fig. 2, the optical lens of the present embodiment includes: a first lens component 100, a second lens component 200 and a connecting rubber material. The first lens part 100 includes a first lens barrel 102 and a first lens 101 mounted on the first lens barrel 102, and the first lens 101 includes a first optical area 1011 for imaging and a first structural area 1012 outside the first optical area 1011. The second lens part 200 includes a second barrel 202 and four second lenses 201 mounted on the second barrel 202, the first lens 101 and the four second lenses 201 together constitute an imageable optical system, and a bottom surface of a first structural region 1012 of the first lens 101 is lower than a top surface of the second barrel 202. For example, the height (the dimension in the optical axis direction) of the inner side surface of the first lens barrel 102 may be designed to be smaller than the thickness (the dimension in the optical axis direction) of the first structure area, so that after the first lens is inserted into the first lens barrel, a part of the outer side surface of the first lens 101 is exposed outside the inner side surface of the first lens barrel 102, and the exposed part sinks into the light-passing hole of the second lens barrel 202, thereby realizing that the bottom surface of the first structure area 1012 of the first lens 101 is lower than the top surface of the second lens barrel 202. Further, a connecting rubber is located between the first lens component 100 and the second lens component 200, and is adapted to support and fix a relative position between the first lens component 100 and the second lens component 200. In this embodiment, the connecting rubber is adapted to support and fix the first lens component 100 and the second lens component 200 so as to keep them at the relative positions determined by active calibration, and an included angle between an axis of the first lens component 100 and an axis of the second lens component 200 may be different from zero, where the active calibration is relative position adjustment of the first lens component 100 and the second lens component 200 according to an actual imaging result of the optical system. Active calibration is further described below in conjunction with the embodiments. In this embodiment, the connecting adhesive material includes a first adhesive material 301, which is located between the bottom surface of the first barrel 102 and the top surface of the second barrel 202.

Note that, in another embodiment, the number of the first lenses 101 may also be multiple. At this time, one of the plurality of first lenses 101 has a bottom first lens 101 located at the lowermost position. And the bottom surface of the first structure region 1012 of the bottom first lens 101 is lower than the top surface of the second barrel 202. In addition, it is easily understood that when there is only one first lens 101 (such as shown in fig. 2), the first lens 101 can be regarded as the bottom first lens 101.

In the above embodiment, the bottom surface of the first structure region 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202, so that the position of the first lens 101 of the lens based on the active alignment technology (which may be referred to as AOA lens) is lowered, the total optical length (TTL) of the camera module is reduced, and the height of the camera module is further reduced.

In order to make the above technical effects easier to understand, the following description will be made with reference to a comparative example of fig. 1. Fig. 1 shows a schematic longitudinal sectional view of an optical lens 1000 in a comparative example. The optical lens 1000 includes a first lens component 100, a second lens component 200, and a connecting glue. The first lens part 100 includes a first lens 101 and a first barrel 102, and the second lens part 200 includes a second barrel 202 and a plurality of second lenses 201. The inner side of the second barrel 202 has a multistage stepped bearing surface 2022, and the plurality of second lenses 201 are sequentially embedded into the multistage stepped bearing surface 2022 from small to large. In design, the design size of the topmost second lens 201 is usually smaller, and the top region 2021 of the second lens barrel is often between the first lens 101 and the second lens 201, and a gap required for active alignment needs to be reserved, so the distance D between the bottom surface of the structural region of the first lens 101 and the top surface of the structural region of the second lens 201 in design is determined by the reserved gap required for active alignment and the thickness of the top region 2021 of the second lens barrel 202 between the first lens 101 and the second lens 201. The profile of each lens must take into account the distance D during the optical design phase so that the active alignment has the required play space. In the present invention, the bottom surface of the first structure region 1012 of the bottom first lens 101 is lower than the top surface of the second barrel 202, so that the thickness of the top region 2021 of the second barrel 202 does not need to be considered in the optical design stage, and thus the position of the first lens 101 of the AOA lens can be sunk in the surface design, thereby reducing the total optical length (TTL) of the camera module, and further reducing the height of the camera module.

Further, fig. 3A shows a schematic longitudinal section of another embodiment of the invention. Fig. 3B shows the top first lens 101 in the embodiment shown in fig. 3A. Referring to fig. 3A and 3B, in the present embodiment, the second lens 201 includes a second optical zone 2011 for imaging and a second structural zone outside the second optical zone 2011, and the second lens 201 includes an uppermost one of the second lenses 201. The connecting rubber material comprises a first rubber material 301 and a second rubber material 302. The first rubber 301 is located between the bottom surface of the first barrel 102 and the top surface of the second barrel 202. The second glue material 302 is located between the first bottom surface 1013 and the second top surface 2013, wherein the first bottom surface 1013 is a bottom surface of the first structure region 1012 of the bottom first lens 101, and the second top surface 2013 is a top surface of the second structure region 2012 of the top second lens 201. The first rubber 301 is suitable for temporarily supporting and fixing the relative positions of the first lens component 100 and the second lens component 200 after pre-curing. The second rubber 301 is suitable for permanently supporting and fixing the relative positions of the first lens component 100 and the second lens component 200 after curing. In this embodiment, the first adhesive material 301 may be a light-curing adhesive, and the second adhesive material 302 may be a thermosetting adhesive. In another embodiment, the first adhesive material 301 and the second adhesive material 302 may be both UV thermosetting adhesive. In this embodiment, the second plastic material 302 is located between the first lens 101 and the second lens 201 to fix and support the first lens part 100 and the second lens part 200 at the relative positions determined by the active calibration, so as to suppress the deterioration of the imaging quality caused by the second variation (e.g. the second variation caused by the unstable combination of the first lens barrel 102 and the first lens 101). In addition, in this embodiment, the surfaces of the structure areas of the first lens 101 and the second lens 201 are both flat surfaces. The forming process difficulty of the first lens 101 and the second lens 201 is low, which is beneficial to saving cost and improving production efficiency.

Further, in one embodiment, the first bottom surface 1013 and the second top surface 2013 are both flat surfaces. The inner side of the second barrel 202 has a step-shaped bearing surface 2022, and at least a portion of the second top surface 2013 bears against the step-shaped bearing surface 2022. In this embodiment, the manufacturing process of the second lens component 200 is mature, so that the assembly tolerance of the second lens barrel 202 and the second lens 201 can be reduced, thereby improving the imaging quality and the yield.

In one embodiment, the second glue material 302 contacts the second barrel 202. The second glue material 302 may be black. The black second glue material 302 helps to block stray light from entering the optical system from the second structure region 2012.

In another embodiment, the second glue material 302 does not contact the second barrel 202. In this embodiment, the first lens 101 and the second lens 201 are directly fixed and supported by the second adhesive material 302, so that the deterioration of the imaging quality caused by the secondary variation can be suppressed. For example, secondary variation caused by unstable coupling between the first barrel 102 and the first lens 101 can be suppressed, and variation in position or surface type of the first lens 101 caused by variation in barrels (e.g., variation in the first and second barrels due to heat or moisture) can be prevented.

Fig. 4A shows a schematic longitudinal section of an optical lens according to yet another embodiment of the present invention. Fig. 4B shows the top first lens 101 in the embodiment shown in fig. 4A. Referring to fig. 4A and 4B, in this embodiment, the second structured area 2012 of the top second lens 201 includes a bearing area 2014 and a bonding area 2015, wherein the sides and top of the bearing area bear against the stepped bearing surface 2022, and the bonding area disposes the second glue material 302.

Further, fig. 5A shows a schematic longitudinal sectional view of an optical lens according to still another embodiment of the present invention. Fig. 5B shows the top first lens 101 in the embodiment shown in fig. 5A. Referring to fig. 5A and 5B, in this embodiment, the second top surface 2013 may have flash grooves 2019, the flash grooves 2019 are located at an end of the second top surface 2013 close to the second optical area 2011, and the second glue material 302 may be black. The embodiment can prevent the second plastic material 302 from polluting the optical area, and avoid the defects caused by the stains of the shot images, thereby improving the yield of the optical lens or the camera module.

Further, in one embodiment, the first lens component 100 is located at the front end of the optical lens, and the second lens component 200 is located at the rear end of the optical lens.

Further, in one embodiment, the first lenses have a bottom first lens at the bottom and the second lenses have a top second lens at the top. At least one of the light-emitting surface of the first lens at the bottom and the light-in surface of the second lens at the top is not a convex surface. When the light-emitting surface of the first lens at the bottom is a convex surface, the light-entering surface of the second lens at the top is a concave surface or a plane; when the light incident surface of the top second lens is a convex surface, the light emergent surface of the bottom first lens is a concave surface or a plane. The above design is to avoid that the light-emitting surface of the first lens at the bottom and the light-entering surface of the second lens at the top are both convex surfaces, so that the first bottom surface 1013 is difficult to sink into the light-passing hole of the second barrel. It should be noted that the light exit surface of the bottom first lens and the light entrance surface of the top second lens may be both concave surfaces, or both flat surfaces, or one flat surface and the other concave surface, and these designs may be convenient for the first bottom surface 1013 to sink into the light through hole of the second barrel. Fig. 9 shows an optical lens in an embodiment of the present invention. As shown in fig. 9, the light-emitting surface of the first lens at the bottom is a concave surface, and the light-entering surface of the second lens at the top is a convex surface. In addition, the drawing shows an adhesive 1019 for adhering the first lens and the first barrel.

in addition, it should be noted that, the first bottom surface (the bottom surface of the first structure region of the bottom first lens) is lower than the top surface of the second lens barrel, which means that the first bottom surface is entirely lower than the top surface of the second lens barrel.

Further, in some embodiments of the present invention, a camera module is further provided. The camera module may comprise the optical lens in any one of the embodiments. The camera module can include optical lens and photosensitive assembly. The optical lens is mounted and fixed on the photosensitive assembly. Wherein, the photosensitive assembly is provided with a photosensitive chip. The camera module can be a fixed focus module or other types of modules such as an automatic focus module. Fig. 8 illustrates an auto-focus module in an embodiment of the invention in which the second lens component further comprises a motor 209 (or other optical actuator). The second barrel 202 is mounted inside the motor carrier, and the base of the motor is mounted on the top surface of the base 409 of the photosensitive assembly.

Further, according to an embodiment of the present invention, there is also provided an optical lens assembling method including steps S10 to S40.

step S10, preparing a first lens part 100 and a second lens part 200, wherein the first lens part 100 includes a first lens barrel 102 and at least one first lens 101 mounted on the first lens barrel 102, the first lens 101 includes a first optical area 1011 for imaging and a first structural area 1012 outside the first optical area 1011, and the at least one first lens 101 has a bottom first lens 101 located at the lowest position, and the second lens part 200 includes a second lens barrel 202 and at least one second lens 201 mounted on the second lens barrel 202. The inner side of the second barrel 202 may have a stepped bearing surface 2022, and at least a portion of the second top surface 2013 bears against the stepped bearing surface 2022.

Step S20, pre-positioning the first lens part 100 and the second lens part 200, so that the at least one first lens 101 and the at least one second lens 201 together form an imaging optical system, and the bottom surface of the first structure area 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202.

Step S30, actively calibrating the relative positions of the first lens component 100 and the second lens component 200 based on the measured imaging result of the optical system.

step S40, adhering the first lens component 100 and the second lens component 200 with a connecting rubber material, so that the first lens component 100 and the second lens component 200 are kept at the relative position determined by the active calibration.

Further, in one embodiment, step S40 includes: arranging the connecting rubber material on the top surface of the second lens component 200; moving the first lens component 100 and the second lens component 200 to relative positions determined by active calibration; and solidifying the connecting glue material. The step of active calibration may be performed first, and then the step of arranging the connection rubber may be performed. The step of arranging the connecting rubber material may be performed first, and then the step of actively calibrating may be performed.

Further, in one embodiment, in step S40, the step of curing the connection glue material includes: pre-curing the first rubber 301 to temporarily support and fix the relative positions of the first lens component 100 and the second lens component 200; and permanently curing the second rubber material to permanently support and fix the relative positions of the first lens component 100 and the second lens component 200. Wherein the pre-curing may include exposing the first glue material 301. The permanent curing may include a baking process of the pre-cured first lens component 100 and the second lens component 200.

fig. 6A-D illustrate an optical lens assembly process according to an embodiment of the present invention. Figure 6A shows a schematic drawing of glue in one embodiment of the invention. Referring to fig. 6A, the first lens part 100 and the second lens part 200 are manufactured first, and then glue is drawn on the top surface of the second lens part 200. In this embodiment, the connecting glue material includes a first glue material 301 and a second glue material 305, the first glue material 301 is located between the bottom surface of the first barrel 102 and the top surface of the second barrel 202, and the second glue material 301 is located between the second top surface 2013 and the first bottom surface 1013, where the first bottom surface 1013 is the bottom surface of the first structure region 1012 of the bottom first lens 101. In step S40, the step of arranging the connection rubber material includes: a first glue 301 is disposed on a top surface of the second barrel 202, and a second glue 302 is disposed on a second top surface 2013, wherein the second top surface 2013 is a top surface of a second structure area 2012 of the top second lens 201, the top second lens 201 is an uppermost one of the at least one second lens 201, and the second structure area 2012 is an area of the second lens 201 outside an optical area for optical imaging. Fig. 6B shows a schematic diagram of the arrangement of the first lens component 100 and the second lens component 200 into relative positions determined by active calibration in one embodiment of the invention. Wherein the active calibration may be completed before the glue is drawn and corresponding coordinates are recorded, and after the glue is drawn, the first lens part 100 and the second lens part 200 are arranged according to the recorded coordinates to restore the relative positions determined by the active calibration. The active calibration may also be performed after the glue is drawn, and specifically, the pre-positioning (step S20) and the active calibration (step S30) may be performed after the glue is drawn, and the relative positions of the first lens assembly 100 and the second lens assembly 200 with the imaging quality up to the standard are determined according to the measured resolution. FIG. 6C shows a schematic representation of pre-curing in one embodiment of the present invention. In the present embodiment, the pre-curing is performed by an exposure process in which an arrow schematically shows the direction of light irradiation. Note that during the pre-cure process, the first lens component 100 and the second lens component 200 are maintained in relative positions as determined by the active calibration by an external capturing mechanism (e.g., a clamping mechanism). After the pre-curing is completed, the relative position determined by the active calibration can be maintained by the fixing and supporting of the pre-cured first rubber material 301. FIG. 6D shows a schematic view of permanent curing in one embodiment of the invention. In this embodiment, the second adhesive material 302 can be cured by integrally baking the pre-cured semi-finished product. The second adhesive material 302 may be a thermosetting adhesive or a UV thermosetting adhesive. Since thermosetting can have a stronger adhesive effect, permanent curing, i.e., permanently bonding the first lens component 100 and the second lens component 200, can be achieved. And the combination has the advantages of high reliability, good weather resistance and the like.

further, in one embodiment, in step S30, the step of actively calibrating includes: the distance between the first bottom surface 1013 and the second top surface 2013 in the optical axis direction is actively calibrated in a range of less than 80 um. Since the first lens is designed to be sunk, the design gap between the bottom first lens and the top second lens (i.e. the design gap between the structural region of the bottom first lens and the structural region of the top second lens) can be reduced during the optical design stage.

Further, according to an embodiment of the present invention, there is provided a method for manufacturing a camera module, including: manufacturing an optical lens by using the manufacturing method of the optical lens in the embodiment; and installing the optical lens on a photosensitive assembly to obtain the camera module. It should be noted that in this embodiment, the optical lens may be fabricated first, and then the optical lens is mounted on the photosensitive component; the assembly of the optical lens (such as the adhesion of the first lens component and the second lens component) and the assembly of the optical lens and the photosensitive component (such as the adhesion of the second lens component and the photosensitive component) can also be completed synchronously.

further, the active calibration described herein may adjust the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. FIG. 7A 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. 7B 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. 7A. 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. 7C 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 100 with respect to the second lens component 200 (i.e., the tilt of the optical axis of the first lens component 100 with respect to the optical axis of the second lens component 200) 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 movement further comprises a translation in the adjustment plane, i.e. a movement in the x, y direction.

Further, in one embodiment, the active calibration further comprises: according to the measured resolution force of the optical system (which means the measured resolution force according to the actual imaging result of the optical system), the included angle of the axis of the first lens component 100 relative to the axis of the second lens component 200, i.e. the adjustment in the w and v directions, is adjusted and determined. In the assembled optical lens or camera module, an included angle between the axis of the first lens component 100 and the axis of the second lens component 200 may be different from zero.

Further, in one embodiment, the active calibration further comprises: moving the first lens component 100 in a direction perpendicular to the adjustment plane (i.e. adjustment in z-direction), the relative position between the first lens component 100 and the second lens component 200 in the direction perpendicular to the adjustment plane is determined from the measured resolving power of the optical system.

Further, in one embodiment, in the pre-positioning step, a gap is provided between the bottom surface of the first lens component 100 and the top surface of the second lens component 200; and in the bonding step, the adhesive material is arranged in the gap.

In one embodiment, in the active calibration step, the second lens component 200 may be fixed, the first lens component 100 may be held by a clamp, and the first lens component 100 may be moved by a six-axis movement mechanism connected to the clamp, so as to achieve the above-mentioned relative movement between the first lens component 100 and the second lens component 200 in six degrees of freedom. Wherein the clip may bear against or partially bear against a side of the first lens component 100, thereby clipping the first lens component 100. In one embodiment, the curvature of the first lens piece may be greater than the curvature of the second lens piece to make the first lens piece more sensitive to position changes than the second lens piece, thereby facilitating active calibration. For example, the stroke of the first lens component during the active calibration process may be reduced, or the adjustment capability of the active calibration may be enhanced (i.e., the capability of compensating for various errors in the manufacturing and assembling process is enhanced, and the greater the adjustment capability means that the larger error can be compensated, so that the optical system can meet the design requirement).

It should be noted that in the above embodiments, the number of lenses of the first lens component and the second lens component may be adjusted as needed. For example, the number of lenses of the first lens part and the second lens part may be two and four, three and three, four and two, five and one, respectively. The total number of lenses of the whole optical lens can also be adjusted according to needs, for example, the total number of lenses of the optical lens can be six, and also can be five or seven.

It should also be noted that the optical lens and the lens components of the present application are not limited to two, and for example, the number of the lens components may also be three or four, etc. which is greater than two. When the number of lens components constituting the optical lens is more than two, the two adjacent lens components may be regarded as the aforementioned first lens component and the aforementioned second lens component, respectively.

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.

Claims

1. An optical lens, comprising:

A first lens part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and the at least one first lens having a bottom first lens located at the lowermost side;

The second lens component comprises a second lens barrel and at least one second lens mounted on the second lens barrel, the at least one first lens and the at least one second lens jointly form an imaging optical system, and the bottom surface of the first structural area of the bottom first lens is lower than the top surface of the second lens barrel; and

And the connecting rubber material is positioned between the first lens part and the second lens part and is suitable for supporting the first lens part and the second lens part and fixing the relative position between the first lens part and the second lens part.

2. An optical lens assembly according to claim 1, wherein the connecting glue is adapted to support and secure the first lens part and the second lens part in relative positions determined by active calibration, the active calibration being relative position adjustment of the first lens part and the second lens part based on actual imaging results of the optical system, and an angle between an axis of the first lens part and an axis of the second lens part being different from zero.

3. An optical lens according to claim 1, wherein the connecting glue comprises a first glue located between a bottom surface of the first barrel and a top surface of the second barrel.

4. An optical lens according to claim 3, wherein the second lens includes a second optical zone for imaging and a second structural zone outside the second optical zone, the at least one second lens having an uppermost one of the top second lenses; and

the connecting adhesive material further comprises a second adhesive material located between a first bottom surface and a second top surface, wherein the first bottom surface is the bottom surface of the first structure area of the bottom first lens, and the second top surface is the top surface of the second structure area of the top second lens.

5. An optical lens as claimed in claim 4, characterized in that the first glue is adapted to temporarily support and fix the relative positions of the first lens component and the second lens component after pre-curing, and the second glue is adapted to permanently support and fix the relative positions of the first lens component and the second lens component after curing.

6. an optical lens according to claim 5, wherein the first adhesive material is a light-cured adhesive and the second adhesive material is a thermosetting adhesive.

7. an optical lens according to claim 5, wherein the first and second adhesive materials are both UV thermosetting adhesive.

8. An optical lens according to claim 4, characterized in that the first bottom surface and the second top surface are both flat surfaces.

9. An optical lens barrel according to claim 4, wherein the inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.

10. An optical lens according to claim 9, wherein the second adhesive material contacts the second barrel.

11. An optical lens according to claim 1, wherein the at least one second lens has a top second lens located uppermost, wherein at least one of the light exit surface of the bottom first lens and the light entrance surface of the top second lens is not convex.

12. An optical lens according to claim 9, wherein the second adhesive material does not contact the second barrel.

13. An optical lens according to claim 9, characterized in that the second structured area of the top second lens comprises a bearing area and an adhesive area, wherein the side and top surfaces of the bearing area bear against the stepped bearing surface and the adhesive area is provided with the second glue material.

14. The optical lens of claim 4, wherein the second top surface has an overflow groove, the overflow groove is located at one end of the second top surface close to the second optical area, and the second glue material is black.

15. An optical lens according to claim 1 wherein the first lens component is located at the optical lens front end and the second lens component is located at the optical lens rear end.

16. A camera module, characterized in that it comprises an optical lens according to any one of claims 1 to 15.

17. An optical lens assembly method, comprising:

Preparing a first lens part and a second lens part, wherein the first lens part comprises a first lens barrel and at least one first lens mounted on the first lens barrel, the first lens comprises a first optical area for imaging and a first structural area outside the first optical area, and the at least one first lens has a bottom first lens positioned at the lowest position, and the second lens part comprises a second lens barrel and at least one second lens mounted on the second lens barrel;

Pre-positioning the first lens part and the second lens part so that the at least one first lens and the at least one second lens jointly form an imaging optical system, and the bottom surface of the first structure area of the first lens at the bottom is lower than the top surface of the second lens barrel;

actively calibrating the relative positions of the first lens component and the second lens component based on the measured imaging result of the optical system; and

And bonding the first lens part and the second lens part by using a connecting rubber material so as to keep the first lens part and the second lens part at the relative positions determined by the active calibration.

18. An optical lens assembly method according to claim 17, wherein the step of bonding with a bonding adhesive comprises:

arranging the connecting rubber material on the top surface of the second lens component;

Moving the first lens component and the second lens component to relative positions determined by active calibration; and

And solidifying the connecting glue material.

19. An optical lens assembly method as claimed in claim 18, wherein the step of performing the active calibration is performed before the step of disposing the connecting glue.

20. An optical lens assembly method as claimed in claim 18, wherein the step of disposing the connecting adhesive is performed first, and the step of performing the active calibration is performed later.

21. an optical lens assembly method according to claim 18, wherein in the step of bonding with a bonding adhesive material, the bonding adhesive material includes a first adhesive material and a second adhesive material, and the step of arranging the bonding adhesive material includes:

And arranging a first adhesive material on the top surface of the second lens barrel, and arranging a second adhesive material on the second top surface, wherein the second top surface is the top surface of a second structure area of the top second lens, the top second lens is the uppermost one of the at least one second lens, and the second structure area is an area of the second lens except the optical area for optical imaging.

22. An optical lens assembly method according to claim 21, wherein in the step of bonding with a bonding adhesive, the first adhesive is located between a bottom surface of the first barrel and a top surface of the second barrel, and the second adhesive is located between the second top surface and the first bottom surface, wherein the first bottom surface is a bottom surface of the first structure region of the bottom first lens.

23. An optical lens assembly method according to claim 22, wherein the step of curing the connecting paste includes:

pre-curing the first rubber material to temporarily support and fix the relative positions of the first lens part and the second lens part; and

And the second rubber material is permanently solidified so as to permanently support and fix the relative positions of the first lens component and the second lens component.

24. An optical lens assembly method according to claim 23, wherein the pre-curing includes exposing the first glue material.

25. An optical lens assembly method as recited in claim 24, wherein the permanent curing includes a baking process of the pre-cured first and second lens components.

26. An optical lens assembly method according to claim 22, wherein in the preparing step, the inner side of the second barrel has a stepped bearing surface, and at least a part of the second top surface bears against the stepped bearing surface.

27. an optical lens assembly method according to claim 22, wherein the step of actively calibrating comprises: and the distance between the first bottom surface and the second top surface along the optical axis direction is enabled to be in the range of less than 80um for active calibration.