CN209842189U - Lens group assembly, optical lens and camera module - Google Patents

Abstract

The utility model provides a lens group spare, include: a lens barrel; and the lenses are embedded into the lens barrel to be assembled into a lens group, and a rubber material is arranged between at least two lenses in the lenses and/or between at least one lens of the lenses and the lens barrel so as to reinforce the structural strength of the assembled lens group. The utility model also provides a corresponding optical lens and the module of making a video recording. The utility model can improve the assembly precision and the assembly stability of the high-sensitivity multi-lens optical system by increasing the bonding between the lenses; the variation of the optical lens based on the active calibration process can be reduced; the glue material which may overflow originally can be accommodated; the defects of the optical lens based on the active calibration process caused by assembly can be reduced, and particularly, the field curvature and the peak variation can be reduced.

Description

Lens group assembly, optical lens and camera module

Technical Field

The utility model relates to an optical imaging technology field, specifically speaking, the utility model relates to a lens crowd subassembly, optical lens and the module of making a video recording.

Background

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

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

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

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

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

Disclosure of Invention

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

According to an aspect of the present invention, there is provided a lens group assembly, including: a lens barrel; and the lenses are embedded into the lens barrel to be assembled into a lens group, and a rubber material is arranged between at least two lenses in the lenses and/or between at least one lens of the lenses and the lens barrel so as to reinforce the structural strength of the assembled lens group.

The lens barrel comprises a plurality of lenses, wherein the plurality of lenses are provided with three lenses positioned at the front end, and the adhesive material is arranged between at least two of the three lenses positioned at the front end and/or between at least one of the three lenses positioned at the front end and the lens barrel.

The lenses are provided with an optical area and a structural area surrounding the optical area, the lenses comprise two adjacent bonded reinforced lenses, and the structural area of the two adjacent bonded reinforced lenses is provided with the glue material.

The lenses are provided with an optical area and a structural area surrounding the optical area, the lenses comprise a first embedded lens and a second embedded lens which are adjacent, the structural area of the first embedded lens is provided with a first embedded convex part, the structural area of the second embedded lens is provided with a second embedded convex part, the first embedded convex part and the second embedded convex part are staggered, and the glue material is arranged in an embedded gap formed between the inner side surface of the first embedded convex part and the outer side surface of the second embedded convex part.

Wherein, the glue material comprises glue and/or a glue film.

Wherein, when the glue material is glue, the glue has a thixotropic coefficient within 1.2 and a viscosity below 500.

When the glue material is glue, the lenses comprise two adjacent bonding reinforcing lenses, a space ring is arranged between the two adjacent bonding reinforcing lenses, and the space ring is provided with a gap for accommodating the glue.

When the adhesive material is an adhesive film, the plurality of lenses comprise two adjacent bonding reinforcement lenses, and the two adjacent bonding reinforcement lenses are bonded through the adhesive film.

The lenses comprise embedded reinforcing lenses, and the rubber material is arranged between the embedded reinforcing lenses and the lens cone.

Wherein, the lens barrel inboard has multistage step, a plurality of lenses imbed in proper order the multistage step.

Each stage of the multistage step comprises a step side wall and a step surface, wherein the step side wall is parallel to the axis of the lens barrel, and the step surface is perpendicular to the axis of the lens barrel.

The lens barrel comprises a lens barrel body, a glue material, a flow guide channel and a sealing material, wherein the glue material is glue, the inner side of the lens barrel body is provided with the flow guide channel, the flow guide channel is communicated with at least two adjacent steps in the multistage steps so as to be suitable for the glue to flow between the at least two adjacent steps, and the flow guide channel is filled with the glue material.

The flow guide channel is a flow guide groove, and a gap between the flow guide groove and the outer side surface of the embedded reinforcing lens is filled with the adhesive material.

The rubber material is annularly arranged, or the rubber material is distributed at a plurality of annular points.

Wherein, the glue material is UV glue, UV thermosetting glue, moisture curing glue, anaerobic glue or glue cured by solvent volatilization.

According to the utility model discloses an on the other hand still provides an optical lens, include: a first lens component comprising at least one first lens; the second lens component comprises a second lens barrel and at least one second lens arranged in the second lens barrel, and the at least one second lens and the at least one first lens jointly form an imaging optical system; and an active alignment adhesive positioned between the first lens piece and the second lens piece and adapted to support the first lens piece and the second lens piece to maintain their relative positions in the relative positions determined by active alignment; wherein the second lens part is the lens group assembly as described above, wherein the second lens barrel is the lens barrel of the lens group assembly, and the at least one second lens is the plurality of lenses of the lens group assembly.

The first lens component further comprises a first lens barrel, and the at least one first lens is mounted in the first lens barrel.

Wherein the first lens component is the lens group assembly, wherein the first barrel is the lens barrel of the lens group assembly, and the at least one first lens is the plurality of lenses of the lens group assembly.

Wherein the first lens component is located at a front end of the optical lens.

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

According to the utility model discloses an on the other hand still provides a module of making a video recording, it includes the preceding lens crowd.

According to the utility model discloses an on the other hand still provides another kind of module of making a video recording, and it includes aforementioned optical lens.

According to another aspect of the present invention, there is provided a lens group, the assembling method comprising: 1) sequentially embedding a plurality of lenses into a lens cone with multi-step inner sides to assemble a lens group; and 2) adding a glue material between at least two of the plurality of lenses and/or between at least one of the plurality of lenses and the lens barrel during the execution of the step 1) or after the step 1) is completed, so as to reinforce the structural strength of the assembled lens group.

Wherein the step 2) comprises the sub-steps of: a) for two adjacent lenses in the plurality of lenses, after the previous lens is embedded, an adhesive material is arranged on the surface of the structural area of the previous lens, and then the next lens is embedded.

Wherein the step 2) comprises the sub-steps of: b) for two adjacent lenses in the plurality of lenses, after the previous lens is embedded, glue is arranged between the lens and the lens barrel, and then the next lens is embedded.

Wherein the step 2) comprises the sub-steps of: c) after the adjacent lenses in the plurality of lenses are embedded into the lens barrel, glue is arranged through the flow guide channels arranged on the inner side surface of the lens barrel, and the glue enters gaps between the structural areas of the adjacent lenses along the flow guide channels.

Wherein, in step a), the glue material is glue, step a) still includes: after embedding the previous lens, arranging a spacing ring on the surface of the structural area of the previous lens, wherein the spacing ring is provided with a concave part, the concave part is concave from outside to inside along the direction perpendicular to the optical axis, and the area of the surface of the previous lens corresponding to the position of the concave part is exposed; then arranging said glue in said area corresponding to the location of said recess; and finally embedding the latter lens.

In the step a), the adhesive material is an adhesive film, and the adhesive film forms a diaphragm.

Compared with the prior art, the utility model discloses at least one technological effect below having:

1. the utility model discloses can improve the assemblage precision and the assemblage stability at high sensitivity many lens optical system through increasing the bonding between the lens (for example adopt glue/glued membrane reinforcement).

2. The utility model discloses can be through the joint strength who increases the lens crowd to reduce the variation based on the optical lens of initiative calibration technology.

3. The utility model discloses can hold the gluey material that probably spills over originally through structural design such as camera lens blackness thing (for example lens cone) lateral wall reserved clearance and space ring clearance, strengthen the joint strength between camera lens and blackness thing, lens and the lens simultaneously.

4. The utility model discloses can be through the reinforcing of crowd's bonding strength under the camera lens to reduce because of the equipment bad that leads to, especially can reduce field curvature and peak variation based on the optics camera lens of initiative calibration technology.

Drawings

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

Fig. 1 shows a schematic cross-sectional view of an optical lens 1000 according to an embodiment of the invention;

fig. 2 is a schematic view illustrating a first lens embedded in a lens barrel according to an embodiment of the present invention;

FIG. 3 shows a schematic view of spacer 214 disposed on the bottom surface of the lens;

FIG. 4 shows a schematic bottom view of the spacer 214 provided;

FIG. 5 is a schematic view showing a second lens inserted into a barrel;

fig. 6 is a schematic view showing a lens barrel having a flow guide channel on an inner side thereof and a lens inserted into the lens barrel;

fig. 7 is a schematic bottom view of a flow guide channel located in a lens barrel according to an embodiment of the present invention;

fig. 8 shows a schematic cross-sectional view of an optical lens according to another embodiment of the invention;

fig. 9 shows another example of adhesion reinforcement between the insertion reinforcement lens and the lens barrel;

FIG. 10 shows the complete lens cluster assembly with the glue wells 213 of FIG. 9;

fig. 11 shows a schematic view of an optical lens with adjacent first and second fitting lenses 10, 20;

fig. 12A illustrates a relative position adjustment in active calibration according to an embodiment of the present invention;

fig. 12B illustrates a relative position adjustment in active calibration according to an embodiment of the present invention;

fig. 12C shows a relative position adjustment with v and w direction adjustments added to the active calibration according to yet another embodiment of the present invention.

Detailed Description

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

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

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

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

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

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

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

Fig. 1 shows a schematic cross-sectional view of an optical lens 1000 according to an embodiment of the present invention. As shown in fig. 1, an optical lens 1000 of the present embodiment includes a first lens part 100, a second lens part 200, and an adhesive 300 that adheres the first and second lens parts 200. The adhesive 300 is adapted to support the first and second lens components after curing and to maintain the relative position therebetween in a relative position determined by active alignment, and thus the adhesive 300 may be referred to as an active alignment adhesive to facilitate differentiation from other adhesive materials. The other glue material described here may be, for example, a glue material 215 for reinforcing the structure of the lens group as will be referred to hereinafter. Herein, the active calibration is a manufacturing process for calibrating the relative positions of the first lens part 100 and the second lens part 200 with multiple degrees of freedom based on the imaging result of the photosensitive chip, and a specific method of the active calibration will be further described in detail below, and will not be described herein. In this embodiment, the first lens component 100 includes a first lens barrel and a first lens installed in the first lens barrel 110 (in this embodiment, the number of the first lenses 120 is one, but it should be noted that the present invention is not limited thereto, and the number of the first lenses 120 may be multiple). The second lens part 200 includes a second barrel 210 and a plurality of second lenses 220 mounted in the second barrel 210. The first lens 120 and the plurality of second lenses 220 together form an imageable optical system. In this embodiment, the second lens component 200 is a lens group assembly for increasing the coupling strength between lenses. Specifically, in the present embodiment, the plurality of second lenses 220 are embedded in the lens barrel to form a lens group, and the adhesive material 215 is disposed between two adjacent lowermost second lenses 220 to reinforce the structural strength of the lens group. Note that what is shown in fig. 1 is only one way to reinforce the structural strength of the lens group. In other embodiments of the present invention, a glue material may be disposed between at least two lenses of the second lenses 220 in other manners to reinforce the structural strength of the assembled lens group; a glue material 215 may also be disposed between at least one of the second lenses 220 and the lens barrel to reinforce the structural strength of the assembled lens group; a glue 215 may be further disposed between at least two of the second lenses 220 and between at least one of the second lenses and the lens barrel to reinforce the structural strength of the assembled lens group. For a plurality of lenses, the lenses are embedded into the same lens barrel to be assembled into a lens group, and the connecting strength between the lenses when the lenses are assembled is increased through the rubber material 215, so that the assembling precision and the assembling stability under a high-sensitivity optical system can be improved. In one embodiment, the first lens component 100 is located at the front end of the optical lens 1000, i.e. the end close to the object, and the second lens component 200 is located at the rear end of the optical lens 1000.

Further, still referring to fig. 1, in one embodiment of the invention, a lens has an optical zone and a structural zone surrounding the optical zone. Wherein the lens comprises the first lens 120 or the second lens 220. In the lens group component, two adjacent bonded reinforcement lenses are included in the plurality of lenses, and a glue material 215 is provided between the structural regions of the two adjacent bonded reinforcement lenses.

Further, in an embodiment of the present invention, the inside of the second barrel 210 may have a multi-step 211. Fig. 2 is a schematic view illustrating a first lens is embedded in a lens barrel according to an embodiment of the present invention. Referring to fig. 2, the lens barrel (e.g., the second barrel 210) has a multi-step 211 inside, and the plurality of lenses are sequentially inserted into the multi-step 211. Each of the plurality of steps 211 includes a step sidewall 211a and a step surface 211b, wherein the step sidewall 211a is parallel to an axis of the lens barrel, and the step surface 211b is perpendicular to the axis of the lens barrel.

Further, in an embodiment of the present invention, the lens group comprises two adjacent bonded reinforcing lenses, the two adjacent bonded reinforcing lenses have a spacer 214 therebetween, the spacer 214 may have a gap, and the gap accommodates the glue 215 a. Still referring to fig. 2, the first lens is embedded in the first step of the barrel. The outer side of the structure zone of the lens bears against the step sidewall 211a of the first step, and the top surface of the structure zone (when a plurality of lenses are grouped into a lens group, the lens barrel and the lenses are generally inverted, so the top surface of the structure zone in fig. 2 is located at the bottom of the lenses). In this embodiment, the bottom surface of the structured area of the lens may have a convex portion (in fig. 2, the lens is inverted, so the convex portion is convex upward). Further, FIG. 3 shows a schematic view of the spacer 214 disposed on the bottom surface of the lens. Fig. 4 shows a schematic bottom view of the spacer 214 provided. Referring to fig. 4, the spacer 214 has a notch, which may be a concave portion 214a recessed from the outside to the inside. When the spacer 214 is disposed on the bottom surface of the lens, the groove and the structural compartment of the first lens can form a gap that can receive the glue 215. In other embodiments, a gap for accommodating the adhesive 215 may also be formed between the groove and the lens barrel (e.g., the step sidewall 211a of the lens barrel). The glue 215 is arranged in the gap. In this embodiment, the glue 215 may be a glue 215 a. Further, fig. 5 shows a schematic view of embedding a second lens into the lens barrel. Wherein the second lens and the first lens can bear against each other through the spacer 214 to form an optical stable assembly. Referring to fig. 5, the glue is located between the two lenses to reinforce the structural strength of the combination of the two lenses. Two of the lenses in fig. 5 are bonded reinforcement lenses. In a lens cluster assembly, there may be multiple sets of adjacent bonded reinforcement lenses.

Further, in one embodiment, the SOMA pieces can be held in place by interlocking lenses, or can be placed in an unstressed manner. In particular, the SOMA sheet is designed to have a shape of a notch, and the notch of the SOMA sheet can be used as a mark for machine vision recognition (machine vision here is used for recognizing a painting start point), and can also be a space for accommodating the glue 215 a.

Further, in an embodiment of the present invention, the inner side surface of the lens barrel has a flow guide channel. Fig. 6 shows a lens barrel with a flow guide channel on the inner side and a schematic view of a lens inserted into the lens barrel. Referring to fig. 6, the flow guide channel communicates with at least two adjacent steps of the multi-step steps 211 of the lens barrel to be suitable for glue 215a to flow between the at least two adjacent steps. The flow guide channel is filled with the glue 215 a. Fig. 7 is a schematic bottom view of the diversion channel located in the lens barrel according to an embodiment of the present invention. Referring to fig. 7, the guide channel may be a guide groove 212, and the guide groove 212 is a concave structure located on the inner side surface of the lens barrel. The gap between the channels 212 and the outer side of the lens may be filled with glue 215a to provide structural reinforcement to the assembled lens group. In this embodiment, the adhesive material 215 may be a UV adhesive/UV thermosetting adhesive, a moisture curing adhesive, an anaerobic adhesive, or a solvent volatilization curing adhesive. The area in which the glue is dispensed is the edge area of the lens, which is remote from the optical zone of the lens. In this embodiment, the adhesive 215 has a low viscosity, for example, a viscosity of 500 or less. Viscosity represents the degree of dilution of the glue 215a, with lower viscosity giving better flow. The thixotropic coefficient of glue 215a is within 1.2. The thixotropic coefficient represents thixotropy, which refers to the property that the shear stress of the glue 215a (or called glue) is reduced along with the time under the action of a certain shear rate. The glue with the thixotropic coefficient within 1.2 is characterized in that: the viscosity of the glue solution is rapidly reduced under stirring, so that the glue solution is convenient to brush; when the adhesive tape is stopped, the viscosity of the adhesive liquid is immediately increased, the adhesive liquid cannot flow randomly, the viscosity is thinner when the adhesive tape is used, and the adhesive tape is convenient to coat and scrape.

In one embodiment, the glue 215 may be an underfill glue. The underfill is a glue 215a suitable for the underfill (underfil) process, with a thixotropic coefficient within 1.2.

Further, in an embodiment, the concave depth of the guiding trench 212 inside the lens barrel is greater than 20 μm, and the width of the guiding trench 212 is greater than 20 μm (the specific design size of the guiding trench may be determined according to the lens size and the properties of the glue material). The glue 215a flows through the flow guide channel to bond the adjacent lenses and to bond the lenses and the lens barrel, thereby enhancing the connection strength of the assembled lens group.

Fig. 8 shows a schematic cross-sectional view of an optical lens according to another embodiment of the present invention. In this embodiment, the spacer 214 between the lenses is replaced by an adhesive film 215b (e.g., EVA adhesive film). In other words, the adhesive film 215b may be formed in the shape of the spacer 214 instead of the function of the spacer 214. For example, the adhesive film 215b is made opaque (e.g., set to black), so that the adhesive film 215b has a light blocking effect, thereby forming a diaphragm between the lenses to suppress stray light from interfering with the imaging result. On the other hand, since the adhesive film 215b has adhesiveness, the adhesive film 215b functions to adhere the lenses after receiving a pressure of the adjacent lenses when the lenses are assembled, thereby reinforcing the structural strength of the lens assembly.

Further, in an embodiment of the present invention, the plurality of lenses that constitute the lens group include an embedded reinforcement lens, and the adhesive material 215 is provided between the embedded reinforcement lens and the lens barrel. Referring to fig. 2, in one example, the outer side surface of the embedded reinforcing lens may include an inclined surface 221 (or referred to as an inclined segment), the inclined surface 221 may form a wedge-shaped gap with the inner side surface of the lens barrel (e.g., the step sidewall 211a), and the glue 215a may be disposed in the wedge-shaped gap, so as to reinforce the structural strength of the lens group. Fig. 9 shows another example of adhesion reinforcement between the insertion reinforcement lens and the lens barrel. Referring to fig. 9, in another example, the structural region for embedding the reinforcement lens may include a protrusion, and an outer side surface of the protrusion and an inner side surface of the lens barrel may form a glue accommodating groove 213, and specifically, the outer side surface of the protrusion in fig. 9, together with the step surface 211b and the step side wall 211a of the lens barrel, forms the glue accommodating groove 213. Glue is arranged in this glue receiving groove 213. Further, fig. 10 shows a complete lens cluster assembly having the glue wells 213 of fig. 9. The lens assembly may be used as the second lens component 200, for example, the lens assembly shown in fig. 10 may replace the second lens component 200 in the embodiment of fig. 1 to form another optical lens 1000 assembled based on the active calibration process.

Further, in the above embodiment, the glue material 215 may be annularly disposed (for example, the guiding groove 212 or the glue receiving groove 213 may be annular in a top view), or may be distributed at several points in the annular region (for example, one guiding groove 212 or glue receiving groove 213 may be respectively disposed at four positions of the inner side of the lens barrel).

Further, in an embodiment of the present invention, the plurality of lenses that constitute the lens group include a first embedded lens 10 and a second embedded lens 20 that are adjacent to each other. Fig. 11 shows a schematic view of an optical lens having adjacent first and second fitting lenses 10 and 20. Referring to fig. 11, the structural region of the first fitting lens 10 has a first fitting protrusion 11, the structural region of the second fitting lens 20 has a second fitting protrusion 21, the first fitting protrusion 11 and the first fitting protrusion 11 are offset from each other, and the adhesive material 215 is disposed in a fitting gap formed between an inner side surface of the first fitting protrusion 11 and an outer side surface of the second fitting protrusion 21.

Further, in an embodiment of the present invention, the adhesive material is bonded between the structural regions of the three lenses located at the front end of the lens group, so as to reinforce the structural strength of the lens group. In another embodiment, any one or more of the three lenses at the front end may be bonded to the lens barrel to reinforce the structural strength of the lens group. Furthermore, the three front lenses can be arranged with glue between the lenses and the lens barrel to improve the reinforcing effect. When the number of the lenses of the lens group is larger, for example, four or more than four, the optical sensitivity of the first three lenses is relatively higher, so that the strength of the assembly structure of the first three lenses is reinforced, and the reliability of the active calibration process and the finished optical lens can be better improved. Herein, the front end refers to an end of the lens group or the optical lens close to the object side.

Further, there is also provided, in accordance with an embodiment of the present invention, a lens cluster cube, including:

1) sequentially embedding a plurality of lenses into a lens barrel with a multi-step 211 on the inner side to form a lens group; and

2) adding a glue material 215 between at least two of the plurality of lenses and/or between at least one of the plurality of lenses and the lens barrel during the execution of the step 1) or after the embedding step is completed, so as to reinforce the structural strength of the assembled lens group.

Wherein, the process of embedding the plurality of lenses into the lens barrel in sequence in the step 1) comprises the following steps: and inverting the lens barrel, embedding the first lens into the first-stage step on the inner side of the lens barrel, then embedding the second lens into the second-stage step on the inner side of the lens barrel, and embedding the next lens into the next-stage step, and repeating the steps until all the lenses are embedded into the lens barrel. The structured areas of adjacent lenses may bear directly against each other or may bear together by a spacer 214 (e.g., an SOMA sheet). The process of embedding the two adjacent lenses adds to the step of placing the spacer 214 when the structural zones of the two lenses are held together by the spacer 214. For example, a previous lens is inserted into the lens barrel, the spacer 214 is disposed on the surface of the structural region of the previous lens, and then the next lens is inserted into the lens barrel.

Further, in some embodiments of the present invention, the step 2) comprises any one or more of the sub-steps a), b), c), and the sub-steps a), b), c) are as follows.

a) For two adjacent lenses, the glue 215 is disposed between the two lenses during the process of inserting the two lenses into the lens barrel. That is, for two adjacent lenses, after the previous lens is inserted, the adhesive material 215 is disposed on the surface of the structural region of the lens (referred to as the previous lens) (the lens barrel and the lens are usually inverted during the insertion step, so the surface here is usually the bottom surface). And then the subsequent lens is inserted.

In one example, the glue 215 may be glue 215 a. Preferably, to avoid contamination of the optical zone by glue 215a, the glue 215a may be disposed in a groove formed between the spacer 214 and the lens (referred to as the previous lens). Wherein the spacer 214 may have a recessed portion 214a as shown in figure 4, the recessed portion 214a forming a groove with the lens. The glue 215a may be disposed by: after embedding the previous lens, arranging a spacer on the surface of the structural region of the previous lens, wherein the spacer has a recessed portion 214a, the recessed portion 214a is recessed from the outside to the inside in a direction perpendicular to the optical axis, and an area of the surface of the previous lens corresponding to the position of the recessed portion 214a is exposed; then said glue 215a is arranged in said area corresponding to the position of said recess 214 a; and finally embedding the latter lens.

In another example, the adhesive material may be an adhesive film 215 b. The adhesive film 215b may be formed in the shape of the spacer 214 instead of the function of the spacer 214. For example, the adhesive film 215b is made opaque (e.g., set to black), so that the adhesive film 215b has a light blocking effect, thereby forming a diaphragm between the lenses to suppress stray light from interfering with the imaging result. On the other hand, since the adhesive film 215b has adhesiveness, the adhesive film 215b functions to adhere the lenses after receiving a pressure of the adjacent lenses when the lenses are assembled, thereby reinforcing the structural strength of the lens assembly.

In yet another example, the plurality of lenses that make up the lens group include a first mating lens 10 and a second mating lens 20 that are adjacent to each other as shown in fig. 11. The structural region of the first fitting lens 10 has a first fitting projection 11, and the structural region of the second fitting lens 20 has a second fitting projection 21. After the first fitting lens 10 (i.e., the preceding lens) is fitted, glue 215a is disposed on the surface of the structure region of the first fitting lens 10 at a position abutting against the inner side surface of the first fitting projection 11. Then, a second fitting lens 20 is inserted into the lens barrel, and the first fitting protrusion 11 and the second fitting protrusion 21 are staggered from each other, so that the glue 215a is located in a fitting gap formed between an inner side surface of the first fitting protrusion 11 and an outer side surface of the second fitting protrusion 21.

b) For two adjacent lenses, after embedding the previous lens, glue 215a is disposed between the lens (the previous lens) and the lens barrel, and then the next lens is embedded. For convenience of description, the lens bonded to the lens barrel by the glue 215a is sometimes referred to herein as an embedded reinforcement lens.

As shown in fig. 2, in one example, the outer side surface of the embedded reinforcing lens may include an inclined surface (or referred to as an inclined segment), and the inclined surface may form a wedge-shaped gap with the inner side surface of the lens barrel (e.g., the step sidewall 211a), and the glue 215a may be disposed in the wedge-shaped gap, so as to reinforce the structural strength of the lens group. Fig. 9 shows another example of adhesion reinforcement between the insertion reinforcement lens and the lens barrel. Referring to fig. 9, in another example, the structural region for embedding the reinforcement lens may include a protrusion, and an outer side surface of the protrusion and an inner side surface of the lens barrel may form a glue accommodating groove 213, and specifically, the outer side surface of the protrusion in fig. 9, together with the step surface 211b and the step side wall 211a of the lens barrel, forms the glue accommodating groove 213. Glue 215a is disposed in the glue receiving groove 213.

c) After two (or more) adjacent lenses are embedded into the lens barrel, the glue 215a is arranged through the flow guide channel arranged on the inner side surface of the lens barrel, so that the glue 215a enters the gap between the structural areas of the two (or more) adjacent lenses along the backflow channel.

Referring to fig. 6, the flow guide channel communicates with at least two adjacent steps of the multi-step steps 211 of the lens barrel to be suitable for glue 215a to flow between the at least two adjacent steps. Referring to fig. 7, the guide channel may be a guide groove 212, and the guide groove 212 is a concave structure located on the inner side surface of the lens barrel. The gap between the channels 212 and the outer side of the lens may be filled with glue 215a to provide structural reinforcement to the assembled lens group. In this embodiment, the adhesive material 215 may be a UV adhesive/UV thermosetting adhesive, a moisture curing adhesive, an anaerobic adhesive, or a solvent volatilization curing adhesive. The area in which the glue 215a is disposed is the edge area of the lens, which is remote from the optical zone of the lens. In this embodiment, the adhesive 215 has a low viscosity, for example, a viscosity of 500 or less. Viscosity represents the degree of dilution of the glue 215a, with lower viscosity giving better flow. The thixotropic coefficient of glue 215a is within 1.2. The thixotropic coefficient represents thixotropy, which refers to the property that the shear stress of the glue 215a (or called glue) is reduced along with the time under the action of a certain shear rate. The glue 215a with the thixotropic coefficient within 1.2 is characterized in that: the viscosity of the glue solution is rapidly reduced under stirring, so that the glue solution is convenient to brush; when the adhesive tape is stopped, the viscosity of the adhesive liquid is immediately increased, the adhesive liquid cannot flow randomly, the viscosity is thinner when the adhesive tape is used, and the adhesive tape is convenient to coat and scrape. In this embodiment, after the plurality of lenses are embedded in the lens barrel, the glue 215a may be disposed between the lenses by using the flow guide channel.

Note that the above substeps a), b), and c) correspond to several different methods for reinforcing a lens group with a rubber material, and one of these reinforcement methods may be used alone or a plurality of the reinforcement methods may be used in combination during the assembly of the lens group.

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

The active calibration described herein allows for adjustment of the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. Fig. 12A illustrates a relative position adjustment manner in active calibration according to an embodiment of the present 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. 12B 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. 12A. 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. 12C shows a relative position adjustment manner with v and w direction adjustments added in the active calibration according to still 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 only one of the six degrees of freedom, or may be a combination of any two or more of the six degrees of freedom.

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

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component 100 and the second lens component 200 further includes: and adjusting and determining the included angle of the axis of the first lens component 100 relative to the axis of the second lens component 200, namely the adjustment in the w and v directions according to the measured resolution force of the optical system. In the assembled optical lens or camera module, an included angle between the axis of the first lens component 100 and the axis of the second lens component 200 may be different from zero.

Further, in one embodiment, in the active calibration step, the adjusting of the relative positions of the first lens component 100 and the second lens component 200 further includes: 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, the first lens component 100 may not have the first barrel 110. For example, the first lens component 100 may be comprised of a single first lens 120. Before active calibration, pre-positioning correspondingly to form a gap between the bottom surface of the first lens 120 and the top surface of the second lens component 200; and then carrying out active calibration, arranging the rubber material in the gap and solidifying the rubber material. In this embodiment, the first lens 120 may be formed by a plurality of sub-lenses which are integrally embedded with each other. In this embodiment, the side surfaces and the top surface of the first lens 120 that are not used for imaging may be formed with a light shielding layer. The light shielding layer may be formed by screen printing a light shielding material on the side and top surfaces of the first lens 120.

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. The clamp can bear against or partially bear against the side surface of the first lens component 100, so that the first lens component 100 is clamped and position adjustment with multiple degrees of freedom is performed.

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

Claims (22)

1. A lens cluster, comprising:

a lens barrel; and

the lens comprises a plurality of lenses, wherein the lenses are embedded into the lens barrel to be assembled into a lens group, and a glue material is arranged between at least two lenses in the lenses to reinforce the structural strength of the assembled lens group.

2. The lens group of claim 1, wherein there are three of the plurality of lenses at the front end, and wherein the glue is between at least two of the three lenses at the front end.

3. The lens cluster of claim 2, wherein the lens has an optical zone and a structural zone surrounding the optical zone, and wherein the plurality of lenses includes two adjacent bonded reinforcement lenses with the adhesive material between the structural zones of the two adjacent bonded reinforcement lenses.

4. The lens group according to claim 2, wherein the lens has an optical area and a structural area surrounding the optical area, the plurality of lenses includes a first and a second adjacent fitting lenses, the structural area of the first fitting lens has a first fitting protrusion, the structural area of the second fitting lens has a second fitting protrusion, the first and the second fitting protrusions are offset from each other, and the adhesive is disposed in a fitting gap formed between an inner side surface of the first fitting protrusion and an outer side surface of the second fitting protrusion.

5. The lens group according to claim 2, wherein the glue material comprises glue and/or a glue film.

6. The lens cluster assembly of claim 5, wherein when the glue is a glue, the glue is a glue having a thixotropic coefficient within 1.2 and a viscosity below 500.

7. The lens cluster assembly of claim 5, wherein when the glue material is glue, two adjacent bonded reinforcement lenses are included in the plurality of lenses, a spacer ring is disposed between the two adjacent bonded reinforcement lenses, the spacer ring has a gap, and the gap receives the glue.

8. The lens group assembly of claim 5, wherein when the adhesive material is an adhesive film, two adjacent bonded reinforcement lenses are included in the plurality of lenses, and the two adjacent bonded reinforcement lenses are bonded by the adhesive film.

9. The lens group of claim 1, wherein the plurality of lenses include an embedded reinforcement lens with the glue therebetween.

10. The lens group of claim 1, wherein the lens barrel has a plurality of steps on an inner side thereof, and the plurality of lenses are sequentially inserted into the plurality of steps.

11. The lens cluster of claim 10, wherein each of the plurality of steps comprises a step sidewall and a step face, wherein the step sidewall is parallel to the axis of the lens barrel and the step face is perpendicular to the axis of the lens barrel.

12. The lens group according to claim 11, wherein the glue is glue, and the inner side of the lens barrel has a flow guide channel, the flow guide channel communicates with at least two adjacent steps of the plurality of steps to adapt to the flow of the glue between the at least two adjacent steps, and the flow guide channel is filled with the glue.

13. The lens cluster of claim 12, wherein the flow channels are channels, and wherein gaps between the channels and the outer side of the embedded reinforcement lens are filled with the glue.

14. The lens group according to claim 1, wherein the glue is arranged in a ring shape or distributed at a plurality of points in a ring shape.

15. The lens group of claim 1, wherein the glue material is a UV glue, a UV thermoset glue, a moisture cured glue, an anaerobic glue, or a solvent evaporation cured glue.

16. An optical lens, comprising:

a first lens component comprising at least one first lens;

the second lens component comprises a second lens barrel and at least one second lens arranged in the second lens barrel, and the at least one second lens and the at least one first lens jointly form an imaging optical system; and

an active calibration adhesive positioned between the first lens piece and the second lens piece and adapted to support the first lens piece and the second lens piece to maintain their relative positions in the relative positions determined by the active calibration;

wherein the second lens component is the lens cluster assembly of any of claims 1-15, wherein the second barrel is the lens barrel of the lens cluster assembly and the at least one second lens is the plurality of lenses of the lens cluster assembly.

17. An optical lens as recited in claim 16, wherein the first lens component further includes a first barrel, the at least one first lens being mounted within the first barrel.

18. An optical lens as claimed in claim 17, characterized in that the first lens part is the lens group assembly, wherein the first barrel is the barrel of the lens group assembly and the at least one first lens is the plurality of lenses of the lens group assembly.

19. An optical lens as recited in claim 16, wherein the first lens component is located at a front end of the optical lens.

20. An optical lens according to claim 16, wherein the axis of the first lens component and the axis of the second lens component have an included angle different from zero.

21. A camera module comprising the lens assembly of any one of claims 1-15.

22. A camera module, characterized in that it comprises an optical lens according to any one of claims 16 to 20.