CN110275261B

CN110275261B - Optical lens, camera module and assembling method thereof

Info

Publication number: CN110275261B
Application number: CN201810220286.2A
Authority: CN
Inventors: 褚水佳; 蒋恒; 刘林; 向恩来
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2018-03-16
Filing date: 2018-03-16
Publication date: 2023-06-20
Anticipated expiration: 2038-03-16
Also published as: CN110275261A

Abstract

The present invention provides an optical lens comprising: a first lens part including a first barrel and at least one first lens mounted within the first barrel; a second lens component including a second barrel and at least one second lens mounted within the second barrel, and the at least one second lens and the at least one first lens together constituting an imageable optical system; and a glue material bonding the first lens part and the second lens part together, and at least a part of the glue material is between the lens barrel and the lens; wherein the space between the lens barrel and the lens is between the second lens barrel and the first lens, or between the first lens barrel and the second lens. The invention also provides a corresponding camera module, an optical lens and an assembly method of the camera module. The invention can reduce the lens position offset caused by the deformation of the lens barrel; the imaging quality of the optical lens or the camera module 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, an imaging module and an assembling method thereof.

Background

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

In order to meet the increasingly wide market demands, the high-pixel, small-size and large-aperture camera module is an irreversible development trend of the existing camera module. Currently, the market is providing an increasing demand for the imaging quality of camera modules. Factors affecting the resolution of a camera module for a given optical design include the quality of the optical imaging lens and manufacturing errors during the module packaging process.

Specifically, in the manufacturing process of the optical imaging lens, factors affecting the resolution of the lens come from errors in the assembly of the elements, errors in the thickness of the lens spacing elements, errors in the assembly fit of the lenses, variations in the refractive index of the lens material, and the like. The errors of the components and the assembly thereof comprise errors such as the thickness of the optical surface of each lens unit, the sagittal height of the optical surface of the lens, the surface of the optical surface, the radius of curvature, the single surface and the decentration between the surfaces of the lens, the inclination of the optical surface of the lens and the like, and the sizes of the errors depend on the control capability of the mold precision and the molding precision. The error in the thickness of the lens spacing element depends on the accuracy of the machining of the element. The error in fitting of the lenses depends on the dimensional tolerance of the elements to be fitted and the fitting accuracy of the lens. The errors introduced by the variation in refractive index of the lens material depend on the stability of the material and the batch consistency.

The error of each element affecting the resolution is accumulated and deteriorated, and the accumulated error is increased with the increase of the number of lenses. The existing solution is to control tolerance for the size of each element with high relative sensitivity and compensate for lens rotation to improve the solution, but because the lens with high pixel and large aperture is sensitive, the tolerance is strict, such as: partial sensitive lens 1um lens eccentricity can bring 9' image surface inclination, leads to lens processing and equipment degree of difficulty to be greater and greater, simultaneously because feedback period is long in the assembly process, causes the process ability index (CPK) of lens equipment low, undulant big, leads to the defective rate high. And as described above, because there are many factors affecting the resolution of the lens, there are limits on the manufacturing accuracy for each factor, if only the accuracy of each element is simply improved, the improvement ability is limited, the improvement cost is high, and the imaging quality requirements of the market increasing are not satisfied.

On the other hand, in the processing procedure of the camera module, the assembly process (such as the mounting of the photosensitive chip and the locking process of the motor lens) of each structural member may lead to the inclination of the photosensitive chip, and the superposition of multiple inclinations may lead to the failure of the resolution of the imaging module to reach the predetermined specification, thereby resulting in low yield of the module factory. In recent years, a module factory compensates for tilting of a photosensitive chip through an Active Alignment (Active Alignment) process when assembling an imaging lens and a photosensitive module. However, this process has limited compensation capability. Since various aberrations affecting the resolution result from the capabilities of the optical system (especially the optical imaging lens), when the resolution of the optical imaging lens is insufficient, the existing active calibration process of the photosensitive module is difficult to compensate.

In order to overcome the above-mentioned drawbacks, the applicant proposes an assembly method for manufacturing a complete optical lens or camera module by adjusting and determining the relative positions of the upper and lower sub-lenses based on an active calibration process, and then bonding the upper and lower sub-lenses together according to the determined relative positions. The solution can improve the process capability index (CPK) of mass-produced optical lenses or camera modules; the requirements on the precision of each element of materials (such as a sub-lens or a photosensitive assembly for assembling an optical lens or a camera module) and the assembly precision thereof can be widened and loosened, so that the overall cost of the optical imaging lens and the camera module is reduced; various aberrations of the camera module can be adjusted in real time in the assembly process, the reject ratio is reduced, the production cost is reduced, and the imaging quality is improved. However, active calibration and bonding based on the upper and lower sub-lenses are a brand new production process, and challenges are still faced to realize stable and reliable mass production based on the production process. For example, the lens barrel of the upper sub-lens and the lower sub-lens are bonded by using the adhesive, and in the curing deformation process of the adhesive, the adhesive can form an acting force on the lens barrel, and the acting force can cause the lens barrel to deform undesirably, so that the shape and the position of the lens installed in the lens barrel are changed. In this case, the actual lens position of the optical system after the adhesive is completely cured deviates from the lens position of the optical system determined by active calibration, which may lead to an unexpected imaging quality. For another example, the expansion coefficient of the rubber material is fixed, but the rubber material arranged between the upper sub-lens and the lower sub-lens is often uneven (for example, uneven thickness of the rubber material is caused by glue overflow generated by the upper lens barrel and the lower lens barrel), which easily causes uneven stress of the lens barrel to deform, further causes lens variation and reduces imaging quality.

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 comprising: a first lens part including a first barrel and at least one first lens mounted within the first barrel; a second lens component including a second barrel and at least one second lens mounted within the second barrel, and the at least one second lens and the at least one first lens together constituting an imageable optical system; and a glue material bonding the first lens part and the second lens part together, and at least a part of the glue material is between the lens barrel and the lens; wherein the space between the lens barrel and the lens is between the second lens barrel and the first lens, or between the first lens barrel and the second lens.

In one embodiment, the first lens component and the second lens component have a first gap and a second gap therebetween, the first gap being closer to an outer side of the optical lens than the second gap; the glue materials comprise a first glue material positioned in the first gap and a second glue material positioned in the second gap; the second adhesive material is arranged between the lens barrel and the lens; and the arrangement positions and materials of the first glue material and the second glue material are suitable for enabling the first glue material and the second glue material to be cured successively at different times.

In one embodiment, the first and second glue materials have different materials, and the second glue material provides a greater adhesive force after curing than the first glue material.

In one embodiment, the first glue is a glue that is cured by light.

In one embodiment, the second glue is a glue that is cured by heat, moisture, anaerobic or oxidation.

In one embodiment, the first glue material is a UV glue or a UV thermosetting glue.

In one embodiment, the second glue material is a thermosetting glue or a UV thermosetting glue.

In one embodiment, the first glue material and the second glue material are the same material when in a liquid state, and the first glue material and the second glue material form different materials with different microstructures after curing, so that the adhesive force provided by the second glue material after curing is greater than the adhesive force provided by the first glue material after curing.

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

In one embodiment, the first and second glue materials do not contact each other.

In one embodiment, the first gap has a dimension of 30-100 μm in a direction along the optical axis of the optical lens.

In one embodiment, the second gap has a dimension of 30-100 μm in a direction along the optical axis of the optical lens.

In one embodiment, the second gap differs from the first gap in size along the optical axis of the optical lens by less than a threshold.

In one embodiment, the first gap is located between an end face of the first barrel and an end face of the second barrel.

In one embodiment, the second gap is located between an end face of the first barrel and a non-optical face of a second lens closest to the first barrel, and the non-optical face of the second lens closest to the first barrel has a roughened surface; or the second gap is positioned between the end face of the second lens barrel and the non-optical face of the first lens closest to the second lens barrel, and the non-optical face of the first lens closest to the second lens barrel is provided with a roughened surface.

In one embodiment, the glue is used to support the first lens part and the second lens part after curing, so that the relative position of the first lens part and the second lens part is maintained at the relative position determined by active calibration.

In one embodiment, the end surface of the second barrel includes a flat surface, the first gap is located between the flat surface and the end surface of the first barrel, and the second gap is located between the flat surface and the non-optical surface of the first lens.

In one embodiment, a third gap is formed between an outer side surface of the first lens adhered to the second lens part and an inner side surface of the first lens barrel, and the first lens of the second lens part and the first lens barrel are fixed to each other by a third adhesive filled in the third gap.

In one embodiment, the second gap has a second opening toward an optical axis of the optical lens, a size of the second opening in a direction along the optical axis being larger than an average size of the second gap.

In one embodiment, the first gap has a first opening toward an outside of the optical lens, a size of the first opening being larger than an average size of the first gap in a direction along the optical axis.

In one embodiment, the first lens is closer to the front end of the optical lens than the second lens.

In one embodiment, an end surface of a second lens bonded to the first barrel has an annular groove between the second gap and an optical surface of the second lens.

In one embodiment, an end surface of a second lens bonded to the first barrel has an annular boss, and the second gap is located between the annular boss and the first barrel.

In one embodiment, the end surface of the first lens bonded to the second barrel has an annular boss, and the second gap is located between the annular boss and the second barrel.

In one embodiment, the cross-sectional shape of the boss is trapezoidal or rectangular.

According to another aspect of the present invention, there is further provided an image capturing module including the optical lens provided in the foregoing embodiment.

According to still another aspect of the present invention, there is also provided an optical lens assembly method including: preparing a first lens part including a first barrel and at least one first lens installed in the first barrel, and a second lens part including a second barrel and at least one second lens installed in the second barrel; pre-positioning the first lens component and the second lens component such that the at least one second lens and the at least one first lens together form an imageable optical train; adjusting and determining the relative positions of the first lens component and the second lens component based on active calibration; and bonding the first lens part and the second lens part through a glue material, wherein at least a part of the glue material is arranged between a lens barrel and a lens, and the position between the lens barrel and the lens is between the second lens barrel and the first lens or between the first lens barrel and the second lens.

In one embodiment, the bonding by the adhesive material comprises: the first lens part and the second lens part are supported with a cured glue material to maintain the relative positions of the first lens part and the second lens part at the relative positions determined by active calibration.

In one embodiment, the pre-positioning the first lens component and the second lens component further comprises: forming a first gap and a second gap between the first lens component and the second lens component, wherein the first gap is closer to the outer side of the optical lens than the second gap; the bonding by the adhesive material comprises the following steps: coating a first adhesive material and a second adhesive material on the first gap and the second gap respectively, wherein the adhesive force of the second adhesive material is larger than that of the first adhesive material; solidifying the first adhesive to pre-fix the first lens component and the second lens component; and curing the second adhesive to permanently bond the first lens component and the second lens component.

In one embodiment, in the step of performing the predetermined positioning of the first lens part and the second lens part, the first gap formed is located between an end face of the first barrel and an end face of the second barrel; and the second gap is formed between the end face of the first lens barrel and the non-optical face of one of the at least one second lens closest to the first lens barrel or between the end face of the second lens barrel and the non-optical face of one of the at least one first lens closest to the second lens barrel.

In one embodiment, in the step of bonding by the adhesive, the first adhesive is a UV adhesive or a UV thermosetting adhesive, and the second adhesive is a thermosetting adhesive or a UV thermosetting adhesive.

According to still another aspect of the present invention, there is also provided an assembling method of an image capturing module, including: assembling an optical lens by using the optical lens assembling method; and manufacturing the image pickup module by using the assembled optical lens.

According to still another aspect of the present invention, there is also provided an assembling method of an image capturing module, including: preparing a first lens component and an image pickup module component, wherein the image pickup module component comprises a second lens component and a photosensitive module which are combined together, and the first lens component comprises a first lens barrel and at least one first lens installed in the first lens barrel, and the second lens component comprises a second lens barrel and at least one second lens installed in the second lens barrel; pre-positioning the first lens component and the second lens component such that the at least one second lens and the at least one first lens together form an imageable optical train; adjusting and determining the relative positions of the first lens component and the second lens component based on active calibration; and bonding the first lens part and the second lens part through a glue material, wherein at least a part of the glue material is arranged between a lens barrel and a lens, and the position between the lens barrel and the lens is between the second lens barrel and the first lens or between the first lens barrel and the second lens.

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

1. the invention can reduce the lens position deviation caused by the deformation of the lens barrel, in particular to reduce the influence caused by the deformation of the lens barrel directly bonded with the lens.

2. The invention can utilize the lenses of the upper lens component and the lower lens component to be directly connected with the lens barrel and provide main adhesive force, thereby reducing the influence of the variation of the lens barrel in the lens components on the lenses.

3. The invention can increase the roughness of the invalid area of the lens, and can be directly connected with the lens barrel through the rubber material, thereby enhancing the connection strength of the upper lens part and the lower lens part.

4. The invention can provide the camera module and the optical lens with better imaging quality.

Drawings

Exemplary embodiments are illustrated in referenced figures. 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 imaging module 1000 according to one embodiment of the invention;

FIG. 2 illustrates an enlarged partial cross-sectional view of the bonded area of the first lens component 100 and the second lens component 200 in one embodiment of the invention;

FIG. 3 is an enlarged partial cross-sectional view of the bonding area of the first lens component 100 and the second lens component 200 in another embodiment of the present invention;

Fig. 4 is a partially enlarged cross-sectional view showing a bonding area of the first lens part 100 and the second lens part 200 in still another embodiment of the present invention;

fig. 5 is a partially enlarged cross-sectional view showing a bonding area of the first lens part 100 and the second lens part 200 in still another embodiment of the present invention;

FIG. 6 shows a flow chart of a method of assembling an optical lens in one embodiment of the invention;

FIG. 7 shows a flow chart of step 40 in one embodiment of the invention;

FIG. 8 is a flowchart of an assembly method of camera modules according to another embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of an image capturing module 1000' according to another embodiment of the present invention;

fig. 10 shows an enlarged partial cross-sectional view of the bonding area of the first lens part 100 'and the second lens part 200' in the embodiment shown in fig. 9.

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 these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the 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 in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. 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 the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," 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. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "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 a table approximation, not as terms of a table level, and are intended to illustrate inherent deviations in measured or calculated values that would be recognized by one 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 shows a schematic cross-sectional view of an imaging module 1000 according to an embodiment of the invention. The camera module 1000 includes an optical lens and a photosensitive assembly 300. The optical lens includes a first lens component 100, a second lens component 200, and a glue (not shown) that bonds the first lens component 100 and the second lens component 200 together. The first lens component 100 includes a first lens barrel 101 and one first lens 102, and the second lens component 200 includes a second lens barrel 201 and five second lenses 202. In the present embodiment, the second lens 202 closest to the first lens component 100 is directly bonded to the first barrel 101. In this embodiment, the second lens part 200 may further include a motor 203, and the second barrel 202 may be mounted in a carrier of the motor 203. The photosensitive assembly 300 includes a wiring board 301, a photosensitive chip 302 mounted on the wiring board 301, a cylindrical support 303 mounted on the wiring board 301 and surrounding the photosensitive chip, and a color filter 304 mounted on the cylindrical support 303. The motor 203 is mounted on the top surface of the cylindrical support 303 to fix the second lens member 200 and the photosensitive assembly 300 together. It should be noted that in other embodiments of the present invention, the motor 203 in fig. 1 may be replaced with other structures such as a cylindrical support, or the motor 203 in fig. 1 may be omitted and the second barrel 201 may be directly mounted on the top surface of the cylindrical support 303. It should be noted that in other embodiments the motor 203 may be replaced by other types of optical actuators, such as SMA (shape memory alloy) actuators, MEMS actuators, etc. Wherein the optical actuator refers to a device for causing the optical lens to move relative to the photosensitive chip.

Further, fig. 2 shows a partially enlarged cross-sectional schematic view of the bonding area of the first lens component 100 and the second lens component 200 in one embodiment of the invention. Referring to fig. 2, in the present embodiment, the first lens part 100 and the second lens part 200 have a first gap and a second gap therebetween. The positions of the first gap and the second gap are marked in fig. 2 with "(1)" and "(2)", respectively. The adhesive material comprises a first adhesive material and a second adhesive material, wherein the first adhesive material and the second adhesive material are respectively coated on the first gap and the second gap, and the first gap is closer to the outer side of the optical lens than the second gap (namely, the second gap is closer to the optical axis of the optical lens than the first gap). And the second adhesive material is arranged between the lens barrel and the lens, and the adhesive force provided by the second adhesive material is larger than the adhesive force provided by the first adhesive material. Referring to fig. 2, the first gap is located between the end face 111 of the first barrel 100 and the end face 211 of the second barrel 200. The second gap is located between the end face 112 of the first barrel 100 and the non-optical face 212 of one of the second lenses 202 closest to the first barrel 100. The non-optical face of one of the lenses is the surface of the portion of the lens that does not participate in optical imaging. The portion of the lens that does not participate in optical imaging may be referred to as the non-optical zone, sometimes referred to as the inactive zone. In this embodiment, the non-optical zone of the lens may act as a support. In this embodiment, the adhesive (including the first adhesive and the second adhesive) is used to support the first lens component 100 and the second lens component 200, so that the relative positions of the first lens component 100 and the second lens component 200 are kept at the relative positions determined by active calibration. Wherein the first adhesive material can be used for pre-fixing, and the second adhesive material is used for permanent fixing. In one embodiment, the first glue material is a UV glue, which can be cured by exposure to light. The second glue material is thermosetting glue, and the thermosetting glue can be cured by baking the lens or the module. In this embodiment, the surface of the non-optical surface 212 of the second lens 202 coated with the second adhesive may be roughened to increase the roughness thereof, thereby increasing the adhesion between the second adhesive and the surface of the non-optical surface 212.

In the above embodiment, the second lens 202 is directly adhered to the end face 112 of the first lens barrel 101 by the second adhesive (for example, thermosetting adhesive), so that the position and shape of the second lens 202 are prevented from being changed due to deformation of the lens barrel 201 during the curing process of the second adhesive, and further the imaging quality of the optical lens and the camera module is improved.

Further, still referring to fig. 2, in one embodiment, the second gap has a second opening 402 toward the optical axis of the optical lens, the second opening 402 having a dimension in a direction along the optical axis that is greater than an average dimension of the second gap. That is, a large opening is provided between the first lens component 100 and the second lens component 200 on the side close to the optical axis. This can avoid poor imaging caused by glue spilling over the active area (i.e. the optical area) of the contaminated lens. Further, the surface of the non-optical zone of the second lens 202 may also have a groove 213, the groove 213 being annular in top view. The recess 213 may be used to store excess glue to prevent the glue from contaminating the lens. Further, the first gap has a first opening 401 toward the outside of the optical lens, and the size of the first opening 401 in the direction along the optical axis is larger than the average size of the first gap. That is, a larger opening is also provided between the first lens part 100 and the second lens part 200 on the side close to the outside. In one embodiment, the first lens 102 is closer to the front end of the optical lens than the second lens 202 (the front end of the optical lens refers to the light incident end, and the rear end refers to the end closer to the photosensitive element).

In the above embodiment, the first adhesive may also be a UV thermosetting adhesive. The second adhesive material can also be UV thermosetting adhesive.

Further, fig. 3 is a partially enlarged cross-sectional view showing a bonding area of the first lens part 100 and the second lens part 200 in another embodiment of the present invention. Referring to fig. 3, in the present embodiment, an end surface 212 of the second lens 202 bonded to the first barrel 101 has a boss 213. The second gap is located between the boss 213 and the end face 112 of the first barrel 101. In this embodiment, the boss 213 is used to replace the groove design in the embodiment of fig. 2, so that the lens can be better prevented from being contaminated by glue overflow. The cross-sectional shape of the boss 213 includes, but is not limited to, a trapezoid, a rectangle, etc.

Fig. 4 shows a partially enlarged cross-sectional schematic view of a bonding area of a first lens component 100 and a second lens component 200 in yet another embodiment of the invention. The difference between this embodiment and the embodiment of fig. 2 is that the non-optical surface 121 of the first lens 102 is directly bonded to the end surface of the second barrel 201. Referring to fig. 4, the first gap is located between the end surface 211 of the second barrel 201 and the end surface 111 of the first barrel 101. The second gap is located between the end face 214 of the second barrel 201 and the non-optical face 121 of the first lens 102. The first gap coats a first glue material (e.g., a UV glue or a UV thermoset glue) and the second gap coats a second glue material (e.g., a thermoset glue or a UV thermoset glue). The second gap has a second opening 402 facing the optical axis of the optical lens, the second opening 402 having a size in a direction along the optical axis that is larger than an average size of the second gap. That is, a large opening is provided between the first lens component 100 and the second lens component 200 on the side close to the optical axis. This can avoid poor imaging caused by glue spilling over the active area (i.e. the optical area) of the contaminated lens.

Further, fig. 5 shows a partially enlarged cross-sectional view of a bonding area of the first lens part 100 and the second lens part 200 in still another embodiment of the present invention. Compared to the embodiment of fig. 4, the first lens 102 of the present embodiment has a boss 215 facing the second barrel 201. Specifically, in the present embodiment, the end surface 121 of the first lens 102 bonded to the second barrel 201 has a boss 215. The second gap is located between the boss 215 and the end face 214 of the second barrel 201. The glue material coated on the boss 215 can be led to two sides of the boss when overflowing, so that the glue can be prevented from polluting the effective area of the lens. The cross-sectional shape of boss 215 includes, but is not limited to, trapezoidal, rectangular, etc.

Further, fig. 9 is a schematic cross-sectional view of an image capturing module 1000' according to another embodiment of the present invention. The camera module 1000 'includes an optical lens and a photosensitive assembly 300'. Wherein the optical lens comprises a first lens part 100', a second lens part 200' and a glue (not shown in fig. 9) bonding said first lens part 100 'and second lens part 200' together. Wherein the first lens part 100 'includes a first barrel 101' and one first lens 102', and the second lens part 200' includes a second barrel 201 'and five second lenses 202'. Further, fig. 10 shows a partially enlarged cross-sectional view of the bonding area of the first lens part 100 'and the second lens part 200' in the embodiment shown in fig. 9. In this embodiment, the end surface (e.g., the top surface) of the second barrel 201' includes a flat surface 211', and the flat surface 211' includes a first segment 211a ' and a second segment 211b '. Wherein the first segment 211a 'is closer to the outside of the optical lens than the second segment 211b' (i.e., the second segment 211b 'is closer to the optical axis of the optical lens than the first segment 211 a'). A first gap 410' is formed between the end face 111' (which may be, for example, a bottom face) of the first barrel and the first segment 211a '. A second gap 420 'is formed between the end surface 121' (which may be, for example, the bottom surface of the non-optical zone) of the first lens 102 'and the second segment 211b'. The glue material comprises a first glue material and a second glue material. And the arrangement positions and materials of the first glue material and the second glue material are suitable for enabling the first glue material and the second glue material to be cured successively at different times. In this embodiment, the first adhesive material and the second adhesive material are coated in the first gap and the second gap, respectively, and the adhesive force provided by the second adhesive material is greater than the adhesive force provided by the first adhesive material. On the one hand, the second adhesive material is positioned on the inner side and directly bonds the lens, so that the connecting strength can be directly given to the lens, and the structural strength of the optical lens is improved. On the other hand, the second adhesive material provides larger adhesive force between the lens barrel and the lens, so that the reliability of the optical lens can be improved.

In one embodiment, the first glue material may be a UV glue. The second glue material may be a thermosetting glue. The UV glue is coated in the first gap and the thermosetting glue is coated in the second gap. The UV glue is cured by direct irradiation of light to pre-fix the relative positions of the first lens part and the second lens part as determined by active calibration. And then heating the pre-fixed optical lens to solidify the thermosetting adhesive at the second gap, thereby enhancing the structural strength of the optical lens and improving the reliability of the optical lens.

It should be noted that in other embodiments, the first adhesive may be another adhesive cured by light (e.g., may be a UV thermosetting adhesive). The second glue may also be other glue that is cured by heat, moisture, anaerobic or oxidation.

In another embodiment, the first adhesive material and the second adhesive material may be the same material in the liquid state, for example, the first adhesive material and the second adhesive material may both be UV thermosetting adhesives. However, the UV thermosetting adhesives located in the first gap and the second gap are cured in different manners (for example, the UV thermosetting adhesive in the first gap may be directly irradiated with light to complete photocuring, and then the UV thermosetting adhesive in the second gap is thermally cured), so that different materials with different microstructures are formed after curing, so that the adhesive force provided by the second adhesive material after curing is greater than the adhesive force provided by the first adhesive material after curing. The microstructure may be, for example, a molecular structure, a micron-sized physical form, a molecular proportion, a lattice form, or the like.

Further, in an embodiment, the first glue material and the second glue material may not contact each other, so as to avoid chemical changes generated after the first glue material and the second glue material are mixed, and affect the glue characteristics. The embodiment can further enhance the reliability of the optical lens or the camera module because chemical changes generated after the first adhesive and the second adhesive are mixed are avoided.

Further, in one embodiment, the first gap has a dimension of 30-100 μm in a direction along the optical axis of the optical lens.

Further, in one embodiment, the second gap has a dimension of 30-100 μm in a direction along the optical axis of the optical lens.

Further, when the first and second adhesive materials use the same material in a liquid state (i.e., when uncured), the difference in size of the second gap and the first gap in the direction along the optical axis of the optical lens is smaller than a threshold (the threshold may be smaller than 100 μm).

Further, still referring to fig. 10, in one embodiment, in the first lens part 100', the outer side 122' of the first lens 102' and the inner side 123' of the first lens barrel 101' have a third gap 103' therebetween, and the first lens 102' and the first lens barrel 101' may be fixed to each other by a third adhesive filled in the third gap, thereby forming an integral first lens part 100'.

Further, still referring to fig. 10, in one embodiment, the first gap 410 'has a first opening 401' toward the outside of the optical lens, the size of the first opening 401 'being larger than the average size of the first gap 410' in the direction along the optical axis. The second gap 420' has a second opening 402' toward the optical axis of the optical lens, the second opening 402' having a size greater than an average size of the second gap in a direction along the optical axis.

Further, still referring to fig. 9, in one embodiment, the second lens part 200 'may further include a motor 203', and the second lens barrel 202 'may be mounted in a carrier of the motor 203'. The photosensitive assembly 300 'includes a wiring board 301', a photosensitive chip 302 'mounted on the wiring board 301', a cylindrical support 303 'mounted on the wiring board 301' and surrounding the photosensitive chip, and a color filter 304 'mounted on the cylindrical support 303'. The motor 203 'is mounted on the top surface of the cylindrical support 303' to fix the second lens member 200 'and the photosensitive assembly 300'. It is to be noted that, in other embodiments of the present invention, the motor 203 'in fig. 9 may be replaced by other structures such as a cylindrical support, or the motor 203' in fig. 9 may be omitted and the second barrel 201 'may be directly mounted on the top surface of the cylindrical support 303'. It should be noted that in other embodiments the motor 203' may be replaced by other types of optical actuators, such as SMA (shape memory alloy) actuators. Wherein the optical actuator refers to a device for causing the optical lens to move relative to the photosensitive chip.

It should be noted that in the above-described embodiment, 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 component and the second lens component may be two and four, or three and three, or four and two, or five and one, respectively. The total number of lenses of the whole optical lens can be adjusted as required, for example, the total number of lenses of the optical lens can be six, or can be five or seven.

It is also noted that the optical lens of the present application is not limited to two, and the number of lens components may be three or four or the like greater than two, for example. When there are more than two lens components constituting the optical lens, the adjacent two lens components can be regarded as the first lens component described above and the second lens component described above, respectively. For example, when the number of lens components of the optical lens is three, the optical lens may include two first lens components and one second lens component located between the two first lens components, and all first lenses of the two first lens components and all second lenses of the one second lens component together constitute an imageable optical system that performs active calibration. When the number of lens elements of the optical lens is four, the optical lens may include two first lens elements and two second lens elements, and be arranged in the order of the first lens elements, the second lens elements, the first lens elements, and the second lens elements from top to bottom, and all of the first lenses of the two first lens elements and all of the second lenses of the two second lens elements together constitute an imageable optical system for active calibration. Other variations such as these are not described in detail herein.

Further, fig. 6 shows a flowchart of an optical lens assembly method in an embodiment of the invention. Referring to fig. 6, the method includes:

step 10, preparing a first lens component and a second lens component, wherein the first lens component comprises a first lens barrel and at least one first lens installed in the first lens barrel, and the second lens component comprises a second lens barrel and at least one second lens installed in the second lens barrel.

Step 20, pre-positioning the first lens component and the second lens component such that the at least one second lens and the at least one first lens together form an imageable optical system.

Step 30, adjusting and determining the relative position of the first lens component and the second lens component based on the active calibration.

Step 40, bonding the first lens component and the second lens component by a glue material, wherein at least a part of the glue material is between a lens barrel and a lens, and the space between the lens barrel and the lens is between the second lens barrel and the first lens, or between the first lens barrel and the second lens. In this step, the first lens component and the second lens component are supported with a cured adhesive material so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by active calibration.

Further, in one embodiment, before step 30 is performed, a glue coating may be performed on the gap between the first lens component and the second lens component, and then step 30 is performed to adjust and determine the relative positions of the first lens component and the second lens component. After determining the relative position, step 40 is performed to cure the glue material, thereby supporting the first lens part and the second lens part with the cured glue material, and further maintaining the relative positions of the first lens part and the second lens part at the relative positions determined by active calibration. In yet another embodiment, step 30 may be performed first to adjust and determine the relative positions of the first lens component and the second lens component. After determining the relative position, the first lens part (or the second lens part) is temporarily moved away, then glue coating is performed, and then the first lens part (or the second lens part) is moved back based on the determined relative position. And finally, curing the adhesive material to enable the relative positions of the first lens component and the second lens component to be kept at the relative positions determined through active calibration.

Further, in one embodiment, in the step 30, a first gap and a second gap are formed between the first lens component and the second lens component, wherein the first gap is closer to an outer side of the optical lens than the second gap.

Further, FIG. 7 shows a flow chart of step 40 in one embodiment of the invention. Referring to fig. 7, the step 40 includes the sub-steps of:

step 401, coating a first adhesive material and a second adhesive material on the first gap and the second gap, respectively, wherein the adhesive force of the second adhesive material is greater than that of the first adhesive material.

Step 402, curing the first adhesive to pre-fix the first lens component and the second lens component.

Step 403, after the pre-fixing is completed, curing the second adhesive to permanently bond the first lens component and the second lens component. The first adhesive material can be UV adhesive, and the second adhesive material can be thermosetting adhesive.

In step 402, when the first lens barrel and the second lens are bonded by using the first adhesive, the adhesive curing deformation has a smaller acting force on the lens barrel, so that the lens barrel is not undesirably deformed. Also, during the active calibration phase, the first lens component and/or the second lens component are typically captured (e.g., clamped or absorbed) by an external capture mechanism to adjust the relative positions of the first lens component and the second lens component. The pre-fixation may allow the relative position between the first lens component and the second lens component to remain in the relative position determined by the active calibration after being disengaged from the external uptake mechanism. That is, the first glue material, after curing, provides support for the first lens component and the second lens component so that they remain in the relative positions determined by the active calibration. In step 403, since the lens is directly adhered to the end surface of the corresponding lens barrel, the lens position change caused by the deformation of the lens barrel can be avoided, so that the permanent relative position between the first lens component and the second lens component formed after curing is ensured to be consistent with the relative position between the first lens component and the second lens component determined by active calibration.

It should be noted that the dimensions of the first gap and the second gap in the direction along the optical axis of the optical lens (for convenience of description, the dimensions in the direction along the optical axis of the optical lens are referred to as dimensions in this natural section) are ultimately determined by the active calibration result, however, the dimensions are also related to the design gap of the optical lens at the design stage. In the design stage, when the size of the designed gap reserved between the structural surfaces of the first lens component and the second lens component is smaller, the size of the first gap and the second gap determined by active calibration is also reduced. The smaller first gap and the smaller second gap are beneficial to inhibiting secondary variation of the lens barrel and/or the lens caused by curing of the adhesive material, so that the imaging quality of the optical lens or the corresponding camera module is improved.

Further, in one embodiment, in the step 10, the first gap is formed between an end face of the first lens barrel and an end face of the second lens barrel. And the second gap is formed between the end face of the first lens barrel and the non-optical face of one of the at least one second lens closest to the first lens barrel. In yet another embodiment, the second gap is formed between an end face of the second barrel and a non-optical face of one of the at least one first lens closest to the second barrel.

Further, according to an embodiment of the present invention, there is also provided an image capturing module assembly method including: the optical lens assembly method of any of the above embodiments is used to assemble an optical lens, and then an image capturing module is fabricated using the assembled optical lens.

Further, fig. 8 shows a flowchart of an assembling method of an image capturing module according to another embodiment of the present invention, the method includes:

step 100, preparing a first lens component and an image capturing module component, wherein the image capturing module component comprises a second lens component and a photosensitive module which are combined together, and the first lens component comprises a first lens barrel and at least one first lens installed in the first lens barrel, and the second lens component comprises a second lens barrel and at least one second lens installed in the second lens barrel.

Step 200, pre-positioning the first lens component and the second lens component such that the at least one second lens and the at least one first lens together form an imageable optical system.

Step 300, adjusting and determining the relative position of the first lens component and the second lens component based on the active calibration.

Step 400, bonding the first lens component and the second lens component by a glue material, wherein at least a part of the glue material is between a lens barrel and a lens, and the space between the lens barrel and the lens is between the second lens barrel and the first lens, or between the first lens barrel and the second lens.

It can be seen that, compared with the previous embodiment, the second lens component and the photosensitive module are assembled together to form the image capturing module component in this embodiment, and then the image capturing module component is assembled with the first lens component, so as to obtain the complete image capturing module. The process of assembling the image capturing module component and the first lens component may also have various modifications, for example, reference may be made to the embodiments of the optical lens assembly method described above to achieve the assembly of the image capturing module component and the first lens component.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.

Claims

1. An optical lens, comprising:

a first lens part including a first barrel and at least one first lens mounted within the first barrel;

a second lens component including a second barrel and at least one second lens mounted within the second barrel, and the at least one second lens and the at least one first lens together constituting an imageable optical system; and

the adhesive material is used for bonding the first lens component and the second lens component together, and comprises a first adhesive material which is cured firstly and a second adhesive material which is cured later, wherein the first adhesive material and the second adhesive material are made of different materials, the adhesive force provided by the second adhesive material after curing is greater than the adhesive force provided by the first adhesive material after curing, the first adhesive material is arranged between the end face of the first lens barrel and the end face of the second lens barrel, and the second adhesive material is arranged between the lens barrel and the lens; wherein the space between the lens barrel and the lens is between the second lens barrel and the first lens, or between the first lens barrel and the second lens.

2. The optical lens of claim 1, wherein the first lens component and the second lens component have a first gap and a second gap therebetween, the first gap being closer to an outside of the optical lens than the second gap; the glue materials comprise the first glue material positioned in the first gap and the second glue material positioned in the second gap; the second adhesive material is arranged between the lens barrel and the lens; and the arrangement positions and materials of the first glue material and the second glue material are suitable for enabling the first glue material and the second glue material to be cured successively at different times.

3. The optical lens of claim 1, wherein the first adhesive is an adhesive cured by light.

4. The optical lens of claim 1, wherein the second glue is a glue that is cured by thermal curing, moisture curing, anaerobic curing, or oxidation.

5. The optical lens of claim 1, wherein the first adhesive is a UV adhesive or a UV thermosetting adhesive.

6. The optical lens of claim 1, wherein the second adhesive is a thermosetting adhesive or a UV thermosetting adhesive.

7. The optical lens of claim 2, wherein the first and second glue materials are the same material when in a liquid state, and the first and second glue materials form different materials having different microstructures after curing, such that the adhesive force provided by the second glue material after curing is greater than the adhesive force provided by the first glue material after curing.

8. The optical lens of claim 7, wherein the first and second glue materials are both UV thermosets.

9. The optical lens of claim 2, wherein the first and second gel materials are not in contact with each other.

10. The optical lens according to claim 2, wherein a dimension of the first gap in a direction along an optical axis of the optical lens is 30-100 μm.

11. The optical lens according to claim 2, wherein a dimension of the second gap in a direction along an optical axis of the optical lens is 30-100 μm.

12. The optical lens according to claim 2, wherein a difference in a dimension of the second gap and the first gap in a direction along an optical axis of the optical lens is less than a threshold value.

13. The optical lens according to claim 2, wherein the second gap is located between an end face of the first barrel and a non-optical face of the second lens closest to the first barrel, and the non-optical face of the second lens closest to the first barrel has a roughened surface; or the second gap is positioned between the end face of the second lens barrel and the non-optical face of the first lens closest to the second lens barrel, and the non-optical face of the first lens closest to the second lens barrel is provided with a roughened surface.

14. The optical lens of claim 1, wherein the glue is configured to support the first lens component and the second lens component after curing to maintain the relative positions of the first lens component and the second lens component at the relative positions determined by active calibration.

15. The optical lens of claim 2, wherein the end face of the second barrel includes a planar surface, the first gap being located between the planar surface and the end face of the first barrel, the second gap being located between the planar surface and the non-optical surface of the first lens.

16. The optical lens of claim 15, wherein a third gap is provided between an outer side surface of the first lens member and an inner side surface of the first barrel to which the second lens member is bonded, the first lens member and the first barrel being fixed to each other by a third adhesive filled in the third gap.

17. The optical lens according to claim 13, wherein the second gap has a second opening toward an optical axis of the optical lens, a size of the second opening being larger than a size of other portions of the second gap than the second opening in a direction along the optical axis.

18. The optical lens according to claim 13, wherein the first gap has a first opening toward an outside of the optical lens, a size of the first opening being larger than a size of a portion of the first gap other than the first opening in a direction along an optical axis of the optical lens.

19. The optical lens of claim 1, wherein the first lens is closer to a front end of the optical lens than the second lens.

20. The optical lens of claim 13, wherein an end surface of the second lens bonded to the first barrel has an annular groove, the annular groove being located between the second gap and the optical surface of the second lens.

21. The optical lens of claim 13, wherein an end surface of the second lens bonded to the first barrel has an annular boss, the second gap being located between the annular boss and the first barrel.

22. The optical lens of claim 13, wherein an end surface of the first lens bonded to the second barrel has an annular boss, the second gap being located between the annular boss and the second barrel.

23. An optical lens as claimed in claim 21 or 22, wherein the cross-sectional shape of the boss is trapezoidal or rectangular.

24. An imaging module comprising the optical lens of any one of claims 1-23.

25. An optical lens assembly method, comprising:

preparing a first lens part including a first barrel and at least one first lens installed in the first barrel, and a second lens part including a second barrel and at least one second lens installed in the second barrel;

pre-positioning the first lens component and the second lens component such that the at least one second lens and the at least one first lens together form an imageable optical system;

Adjusting and determining the relative positions of the first lens component and the second lens component based on active calibration; and

the first lens component and the second lens component are bonded through the adhesive, wherein the adhesive comprises a first adhesive which is cured firstly and a second adhesive which is cured later, the first adhesive and the second adhesive are made of different materials, the adhesive force provided by the second adhesive after curing is greater than the adhesive force provided by the first adhesive after curing, the first adhesive is arranged between the end face of the first lens cone and the end face of the second lens cone, the second adhesive is arranged between the lens cone and the lens, and the lens cone and the lens are arranged between the second lens cone and the first lens or between the first lens cone and the second lens.

26. The method of assembling an optical lens of claim 25, wherein the bonding by adhesive comprises:

the first lens part and the second lens part are supported with a cured glue material to maintain the relative positions of the first lens part and the second lens part at the relative positions determined by active calibration.

27. The method of assembling an optical lens of claim 25, wherein the pre-positioning the first lens component and the second lens component further comprises: forming a first gap and a second gap between the first lens component and the second lens component, wherein the first gap is closer to the outer side of the optical lens than the second gap;

the bonding by the adhesive material comprises the following steps:

coating a first adhesive material and a second adhesive material on the first gap and the second gap respectively;

solidifying the first adhesive to pre-fix the first lens component and the second lens component; and

and curing the second adhesive to permanently bond the first lens component and the second lens component.

28. The method of assembling an optical lens according to claim 27, wherein in the step of positioning the first lens part and the second lens part, the first gap formed is located between an end face of the first lens barrel and an end face of the second lens barrel; and the second gap is formed between the end face of the first lens barrel and the non-optical face of one of the at least one second lens closest to the first lens barrel or between the end face of the second lens barrel and the non-optical face of one of the at least one first lens closest to the second lens barrel.

29. The method of claim 27, wherein in the step of bonding by glue, the first glue is a UV glue or a UV thermosetting glue, and the second glue is a thermosetting glue or a UV thermosetting glue.

30. The method for assembling the camera module is characterized by comprising the following steps:

assembling an optical lens using the optical lens assembly method of any one of claims 25-29; and

and manufacturing an image pickup module by using the assembled optical lens.

31. The method for assembling the camera module is characterized by comprising the following steps:

preparing a first lens component and an image pickup module component, wherein the image pickup module component comprises a second lens component and a photosensitive module which are combined together, and the first lens component comprises a first lens barrel and at least one first lens installed in the first lens barrel, and the second lens component comprises a second lens barrel and at least one second lens installed in the second lens barrel;