Lens group assembly, optical lens, camera module and lens group assembly method

Abstract

The present invention provides a lens group assembly, comprising: a lens barrel; and a plurality of lenses, wherein the plurality of lenses are embedded in the lens barrel to form a lens group, and there is a glue material between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel, so as to reinforce the structural strength of the assembled lens group. The present invention also provides a corresponding optical lens, a camera module, and a lens group assembly method. The present invention can improve the assembly accuracy and assembly stability of a high-sensitivity multi-lens optical system by increasing the bonding between the lenses; can reduce the variation of the optical lens based on the active calibration process; can accommodate the glue material that may have overflowed; can reduce the defects of the optical lens based on the active calibration process caused by assembly, especially can reduce the field curvature and peak variation.

Description

Technical Field

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

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

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

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

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

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

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

[0008] According to one aspect of the present invention, there is provided a lens group assembly, comprising: a lens barrel; and a plurality of lenses, wherein the plurality of lenses are embedded in the lens barrel to be assembled into a lens group, and there is adhesive between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel to reinforce the structural strength of the assembled lens group.

[0009] Among the plurality of lenses, there are three lenses located at the front end, and the adhesive material is provided between at least two lenses of the three lenses located at the front end and / or between at least one lens of the three lenses located at the front end and the lens barrel.

[0010] The lens has an optical zone and a structural zone surrounding the optical zone, and the plurality of lenses include two adjacent bonded and reinforced lenses, and the adhesive material is disposed between the structural zones of the two adjacent bonded and reinforced lenses.

[0011] Wherein, the lens has an optical zone and a structural zone surrounding the optical zone, the multiple lenses include adjacent first and second interlocking lenses, the structural zone of the first interlocking lens has a first interlocking protrusion, the structural zone of the second interlocking lens has a second interlocking protrusion, the first interlocking protrusion and the second interlocking protrusion are staggered with each other, and the adhesive is arranged in the interlocking gap formed between the inner side surface of the first interlocking protrusion and the outer side surface of the second interlocking protrusion.

[0012] Wherein, the adhesive material includes glue and / or adhesive film.

[0013] Wherein, when the adhesive material is glue, the glue has a thixotropic coefficient within 1.2 and a viscosity below 500.

[0014] Wherein, when the adhesive material is glue, the plurality of lenses include two adjacent bonded and reinforced lenses, a spacer is provided between the two adjacent bonded and reinforced lenses, the spacer has a notch and the notch accommodates the glue.

[0015] Wherein, when the adhesive material is an adhesive film, the plurality of lenses include two adjacent adhesively reinforced lenses, and the two adjacent adhesively reinforced lenses are bonded to each other via the adhesive film.

[0016] Among the plurality of lenses, an embedded reinforced lens is included, and the adhesive material is disposed between the embedded reinforced lens and the lens barrel.

[0017] The inner side of the lens barrel has multiple steps, and the multiple lenses are embedded in the multiple steps in sequence.

[0018] Wherein, each of the multiple steps includes 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.

[0019] Wherein, the adhesive material is glue, and the inner side of the lens barrel has a guide channel, which connects at least two adjacent steps of the multiple steps to allow glue to flow between the at least two adjacent steps, and the guide channel is filled with the adhesive material.

[0020] Wherein, the guide channel is a guide groove, and the gap between the guide groove and the outer side surface of the embedded reinforced lens is filled with the adhesive material.

[0021] The adhesive material is arranged in a ring shape, or the adhesive material is distributed at a plurality of points in a ring shape.

[0022] Wherein, the adhesive material is UV adhesive, UV thermosetting adhesive, thermosetting adhesive, moisture-curing adhesive, anaerobic adhesive or solvent-curing adhesive.

[0023] According to another aspect of the present invention, an optical lens is also provided, comprising: a first lens component, which includes at least one first lens; a second lens component, which includes a second lens barrel and at least one second lens installed in the second lens barrel, the at least one second lens and the at least one first lens together constitute an imageable optical system; and an active calibration adhesive, which is located between the first lens component and the second lens component and is suitable for supporting the first lens component and the second lens component so that the relative positions of the two are maintained at the relative positions determined by active calibration; wherein the second lens component is the lens group assembly mentioned above, wherein the second lens barrel is the lens barrel of the lens group assembly, and the at least one second lens is the multiple lenses of the lens group assembly.

[0024] Wherein, the first lens component further includes a first lens barrel, and the at least one first lens is installed in the first lens barrel.

[0025] Wherein, the first lens component is the lens group assembly, wherein the first lens 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.

[0026] Wherein, the first lens component is located at the front end of the optical lens.

[0027] Wherein, there is a non-zero angle between the axis of the first lens component and the axis of the second lens component.

[0028] According to another aspect of the present invention, a camera module is provided, which includes the lens group mentioned above.

[0029] According to another aspect of the present invention, another camera module is provided, which includes the aforementioned optical lens.

[0030] According to another aspect of the present invention, a lens group assembling method is provided, comprising: 1) embedding a plurality of lenses in sequence into a lens barrel having a plurality of steps on the inner side thereof to assemble a lens group; and 2) during the execution of step 1) or after the completion of step 1), adding adhesive between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel to reinforce the structural strength of the assembled lens group.

[0031] Wherein, the step 2) comprises the sub-steps of: a) for two adjacent lenses among the plurality of lenses, after embedding the previous lens, arranging adhesive on the surface of the structural area of ​​the previous lens, and then embedding the next lens.

[0032] Wherein, the step 2) includes the sub-step: b) for two adjacent lenses among the plurality of lenses, after embedding the previous lens, arranging glue between the lens and the lens barrel, and then embedding the next lens.

[0033] Wherein, the step 2) includes the sub-step: c) after adjacent lenses among the plurality of lenses are embedded in the lens barrel, glue is arranged through a guide channel arranged on the inner side of the lens barrel, so that the glue enters the gap between the structural areas of the adjacent lenses along the guide channel.

[0034] Wherein, in step a), the adhesive material is glue, and step a) further comprises: after embedding the previous lens, arranging a spacer on the surface of the structural area of ​​the previous lens, the spacer having a recessed portion, wherein the recessed portion is recessed from outside to inside along 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 is exposed; then arranging the glue in the area corresponding to the position of the recessed portion; and finally embedding the next lens.

[0035] Wherein, in the step a), the adhesive material is an adhesive film, and the adhesive film forms an aperture.

[0036] Compared with the prior art, the present invention has at least one of the following technical effects:

[0037] 1. The present invention can improve the assembly accuracy and assembly stability of a high-sensitivity multi-lens optical system by increasing the adhesion between lenses (for example, using glue / film reinforcement).

[0038] 2. The present invention can reduce the variation of the optical lens based on the active calibration process by increasing the connection strength of the lens group.

[0039] 3. The present invention can accommodate the glue that may overflow through the structural design of the side wall of the lens black object (such as the lens barrel) and the spacer gap, while enhancing the connection strength between the lens and the black object, and between the lenses.

[0040] 4. The present invention can reduce the defects caused by assembly of optical lenses based on active calibration process by enhancing the bonding strength of the lens group under the lens, especially reducing the field curvature and peak variation. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Exemplary embodiments are shown in the referenced drawings. The embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

[0042] Figure 1 A cross-sectional schematic diagram of an optical lens 1000 according to an embodiment of the present invention is shown;

[0043] Figure 2A schematic diagram showing a method of embedding a first lens into a lens barrel in one embodiment of the present invention is shown;

[0044] Figure 3 A schematic diagram showing a spacer 214 is provided on the bottom surface of the lens;

[0045] Figure 4 A bottom view of the spacer 214 is shown;

[0046] Figure 5 A schematic diagram showing the insertion of a second lens into the lens barrel;

[0047] Figure 6 A schematic diagram showing a lens barrel having a guide channel on the inner side and a lens embedded in the lens barrel;

[0048] Figure 7 A bottom view schematically shows a flow guide channel located in a lens barrel in one embodiment of the present invention;

[0049] Figure 8 A cross-sectional schematic diagram of an optical lens according to another embodiment of the present invention is shown;

[0050] Fig. 9 Another example of bonding reinforcement between an embedded reinforcement lens and a lens barrel is shown;

[0051] Fig.10 Shows that there is Fig. 9 The complete lens group assembly of the adhesive containing groove 213 is shown;

[0052] Fig.11 A schematic diagram of an optical lens having adjacent first mosaic lens 10 and second mosaic lens 20 is shown;

[0053] Fig. 12A The relative position adjustment method in active calibration in one embodiment of the present invention is shown;

[0054] Fig. 12B The relative position adjustment method in active calibration in one embodiment of the present invention is shown;

[0055] Fig. 12C A relative position adjustment method with added v and w direction adjustments in active calibration of yet another embodiment of the present invention is shown. DETAILED DESCRIPTION

[0056] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0057] It should be noted that in this specification, the expressions of first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Therefore, without departing from the teaching of this application, the first subject discussed below can also be referred to as the second subject.

[0058] In the drawings, the thickness, size and shape of objects have been slightly exaggerated for ease of explanation. The drawings are only examples and are not drawn strictly to scale.

[0059] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, wholes, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, parts and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0060] As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation, not degree, and are intended to account for the inherent variations in measurements or calculations that would be recognized by those of ordinary skill in the art.

[0061] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0062] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] Figure 1FIG. 1 is a cross-sectional schematic diagram of an optical lens 1000 according to an embodiment of the present invention. Figure 1 As shown, the optical lens 1000 of this embodiment includes a first lens component 100, a second lens component 200 and an adhesive 300 for bonding the first and second lens components 200. The adhesive 300 is suitable for supporting the first and second lens components after curing and keeping the relative position between the two at the relative position determined by active calibration, so the adhesive 300 can be called active calibration adhesive to distinguish it from other adhesive materials. The other adhesive materials described here can be, for example, the adhesive 215 used to reinforce the structure of the lens group to be involved below. In this article, active calibration is a manufacturing process for calibrating the relative position of the first lens component 100 and the second lens component 200 with multiple degrees of freedom based on the imaging result of the photosensitive chip. The specific method of active calibration will be further described in detail below, and will not be described here. In this embodiment, the first lens component 100 includes a first lens barrel and a first lens installed in the first lens barrel 110 (the number of the first lens 120 in this embodiment is one, but it should be noted that the present invention is not limited to this, and there can also be multiple first lenses 120). The second lens component 200 includes a second lens barrel 210 and a plurality of second lenses 220 installed in the second lens barrel 210. The first lens 120 and the plurality of second lenses 220 together constitute an imageable optical system. In this embodiment, the second lens component 200 is a lens group component that increases the connection strength between lenses. Specifically, in this embodiment, a plurality of second lenses 220 are embedded in the lens barrel to form a lens group, and there is a glue material 215 between the two adjacent second lenses 220 at the bottom to reinforce the structural strength of the assembled lens group. It should be noted that Figure 1 The method shown in FIG. 1 is only one of the ways to strengthen the structural strength of the lens group. In other embodiments of the present invention, a glue material may be arranged between at least two lenses of the plurality of second lenses 220 in other ways to strengthen the structural strength of the assembled lens group; a glue material 215 may also be arranged between at least one lens of the plurality of second lenses 220 and the lens barrel to strengthen the structural strength of the assembled lens group; a glue material 215 may also be arranged between at least two lenses of the plurality of second lenses 220 and between at least one lens of the plurality of lenses and the lens barrel to strengthen the structural strength of the assembled lens group. For a plurality of lenses, they are embedded in the same lens barrel to form a lens group, and the connection strength between the lenses when the lenses are assembled is increased by the glue material 215, so as to improve the assembly accuracy and assembly stability under a high-sensitivity optical system. In one embodiment, the first lens component 100 is located at the front end of the optical lens 1000, that is, at the end close to the object side, and the second lens component 200 is located at the rear end of the optical lens 1000.

[0064] Further, still refer to Figure 1 In one embodiment of the present invention, the lens has an optical zone and a structural zone surrounding the optical zone. The lens includes a first lens 120 or a second lens 220. In the lens group component, the plurality of lenses include two adjacent bonded reinforced lenses, and there is a glue material 215 between the structural zones of the two adjacent bonded reinforced lenses.

[0065] Further, in one embodiment of the present invention, the inner side of the second lens barrel 210 may have a plurality of steps 211 . Figure 2 FIG. 1 is a schematic diagram showing a first lens being embedded in a lens barrel in one embodiment of the present invention. Figure 2 The lens barrel (e.g., the second lens barrel 210) has a plurality of steps 211 inside, and the plurality of lenses are sequentially embedded in the plurality of steps 211. Each step of the plurality of steps 211 includes a step side wall 211a and a step surface 211b, wherein the step side wall 211a is parallel to the axis of the lens barrel, and the step surface 211b is perpendicular to the axis of the lens barrel.

[0066] Further, in one embodiment of the present invention, the lens group assembly includes two adjacent bonded reinforced lenses, and a spacer 214 is provided between the two adjacent bonded reinforced lenses. The spacer 214 may have a notch and the notch accommodates the glue 215a. Figure 2 The first lens is embedded in the first step of the lens barrel. The outer side surface of the structure area of ​​the lens is supported by the step side wall 211a of the first step, and the top surface of the structure area (when multiple lenses are assembled into a lens group, the lens barrel and the lenses are usually inverted, so Figure 2 The top surface of the middle structure area is located at the bottom of the lens). In this embodiment, the bottom surface of the structure area of ​​the lens may have a convex portion ( Figure 2 In the embodiment, the lens is inverted, so the protrusion is protruding upward). Further, Figure 3 A schematic diagram showing a spacer 214 is provided on the bottom surface of the lens. Figure 4 FIG. 2 shows a schematic bottom view of the spacer 214 provided. Figure 4 , the spacer 214 has a notch, and the notch can be a recessed portion 214a that is recessed from the outside to the inside. When the spacer 214 is arranged on the bottom surface of the lens, the groove and the structural interval of the first lens can form a gap, and this gap can accommodate the glue 215. In other embodiments, the gap for accommodating the glue 215 can also be formed between the groove and the lens barrel (for example, the step side wall 211a of the lens barrel). The glue 215 is arranged in the gap. In this embodiment, the glue 215 can be glue 215a. Further, Figure 5FIG. 2 shows a schematic diagram of inserting the second lens into the lens barrel. The second lens and the first lens can be supported by each other through the spacer 214 to form a combination with stable optical performance. Figure 5 The adhesive material is located between the two lenses to reinforce the structural strength of the combination of the two lenses. Figure 5 The two lenses in the lens assembly are bonded and reinforced lenses. In one lens assembly, there may be multiple groups of adjacent bonded and reinforced lenses.

[0067] Furthermore, in one embodiment, the SOMA sheet can be fixed by interlocking between lenses, or placed inside without force. In particular, the SOMA sheet is designed to have a notch, and the notch of the SOMA sheet can be used as a mark for machine vision recognition (machine vision is used here to identify the starting point of the glue), and can also be a space for the glue 215a.

[0068] Furthermore, in one embodiment of the present invention, the inner side surface of the lens barrel has a flow guide channel. Figure 6 A schematic diagram showing a lens barrel having a guide channel on the inner side and a lens embedded in the lens barrel is shown. Figure 6 The guide channel is connected to at least two adjacent steps of the multi-step steps 211 of the lens barrel, so that the glue 215a can flow between the at least two adjacent steps. The guide channel is filled with the glue 215a. Figure 7 FIG. 1 is a bottom view schematic diagram of a flow guide channel located in a lens barrel in an embodiment of the present invention. Figure 7 , the guide channel can be a guide groove 212, which is a recessed structure located on the inner side of the lens barrel. The gap between the guide groove 212 and the outer side of the lens can be filled with glue 215a to form a structural reinforcement for the assembled lens group. In this embodiment, the glue material 215 can be UV glue / UV thermosetting glue, thermosetting glue, moisture curing glue, anaerobic glue or solvent volatilization curing glue. The area where the glue is arranged is the edge area of ​​the lens, and the edge area is far away from the optical zone of the lens. In this embodiment, the glue material 215 has a relatively small viscosity, for example, a viscosity of less than 500. The viscosity represents the dilution degree of the glue 215a, and the smaller the viscosity, the better the fluidity. The thixotropic coefficient of the glue 215a is within 1.2. The thixotropic coefficient represents thixotropy, and thixotropy refers to the characteristic that the shear stress of the glue 215a (or glue liquid) decreases with time under a certain shear rate. The specific performance of glue with a thixotropic coefficient within 1.2 in the bonding process is: when stirred, the viscosity of the glue drops rapidly, making it easy to brush; when stopped, the viscosity of the glue increases immediately and does not flow at will. It is relatively thin in viscosity and easy to apply.

[0069] In one embodiment, the adhesive material 215 may be an underfill adhesive. The underfill adhesive is an adhesive 215a suitable for an underfill process, and its thixotropic coefficient is within 1.2.

[0070] Furthermore, in one embodiment, the depth of the guide groove 212 on the inner side of the lens barrel is greater than 20 μm, and the width of the guide groove 212 is greater than 20 μm (the specific design size of the guide groove can be determined according to the lens size and the properties of the glue material). The glue 215a flows through the guide channel to bond adjacent lenses, and to bond the lenses and the lens barrel, thereby strengthening the connection strength of the assembled lens group.

[0071] Figure 8 A cross-sectional schematic diagram of an optical lens of another embodiment of the present invention is shown. In this embodiment, the spacer 214 between the lenses is replaced by a film 215b (e.g., an EVA film). In other words, the film 215b can be made into the shape of the spacer 214 to replace the function of the spacer 214. For example, the film 215b is made opaque (e.g., set to black), so that the film 215b has a light-blocking effect, thereby forming an aperture between the lenses to suppress stray light from interfering with the imaging result. On the other hand, since the film 215b is adhesive, when the lenses are assembled, the film 215b is subjected to pressure from adjacent lenses and plays a role in bonding the lenses, thereby reinforcing the structural strength of the lens assembly.

[0072] Furthermore, in one embodiment of the present invention, the plurality of lenses that compose the lens group include an embedded reinforcement lens, and the adhesive material 215 is disposed between the embedded reinforcement lens and the lens barrel. Figure 2 In one example, the outer side surface of the embedded reinforced lens may include an inclined surface 221 (or called an inclined segment), and the inclined surface 221 may form a wedge-shaped gap with the inner side surface of the lens barrel (such as the step side wall 211a), and the glue 215a may be arranged in the wedge-shaped gap to reinforce the structural strength of the lens group. Fig. 9 Another example of bonding reinforcement between an embedded reinforcement lens and a lens barrel is shown. Fig. 9 In another example, the structural area for embedding the reinforced lens may include a protrusion, and the outer side surface of the protrusion and the inner side surface of the lens barrel may form a glue-containing groove 213. Specifically, Fig. 9 The outer side surface of the middle convex part, the step surface 211b of the lens barrel and the step side wall 211a together form the glue containing groove 213. Glue is arranged in the glue containing groove 213. Further, Fig.10 Shows that there is Fig. 9 The complete lens group assembly of the adhesive containing groove 213 is shown. The lens group assembly can be used as the second lens component 200, for example Fig.10 The lens assembly shown can be replaced Figure 1The second lens component 200 in the embodiment constitutes another optical lens 1000 assembled based on the active calibration process.

[0073] Furthermore, in the above embodiment, the glue material 215 can be arranged in a ring shape (for example, the guide groove 212 or the glue containing groove 213 can be ring-shaped in a top view), or it can be distributed at several points in the ring area (for example, a guide groove 212 or a glue containing groove 213 can be set at each of the four directions on the inner side of the lens barrel).

[0074] Furthermore, in one embodiment of the present invention, the plurality of lenses assembled into the lens group include adjacent first embedded lenses 10 and second embedded lenses 20 . Fig.11 FIG. 1 is a schematic diagram of an optical lens having adjacent first mosaic lenses 10 and second mosaic lenses 20. Fig.11 The structural area of ​​the first embedded lens 10 has a first embedded protrusion 11, and the structural area of ​​the second embedded lens 20 has a second embedded protrusion 21. The first embedded protrusion 11 and the first embedded protrusion 11 are staggered with each other, and the adhesive 215 is arranged in the embedded gap formed between the inner side surface of the first embedded protrusion 11 and the outer side surface of the second embedded protrusion 21.

[0075] Furthermore, in one embodiment of the present invention, the adhesive material is bonded between the structural areas of the three lenses located at the front end of the lens group to reinforce the structural strength of the assembled lens group. In another embodiment, any one or more of the three lenses located at the front end can be bonded to the lens barrel to reinforce the structural strength of the lens group. Further, the adhesive material can be arranged between the lenses and between the lenses and the lens barrel for the above-mentioned three lenses at the front end to enhance the reinforcement effect. When the number of lenses in the lens group is large, for example, four or more than four, since the optical sensitivity of the first three lenses is relatively high, reinforcing the assembly structural strength of the first three lenses can better improve the reliability of the active calibration process and the finished optical lens. In this article, the front end refers to the end of the lens group or the optical lens close to the object side.

[0076] Furthermore, according to an embodiment of the present invention, there is also provided a lens group assembly method, which includes:

[0077] 1) embedding a plurality of lenses in sequence into a lens barrel having a plurality of steps 211 on the inner side thereof to form a lens group; and

[0078] 2) During the execution of step 1) or after the embedding step is completed, glue 215 is added between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel to reinforce the structural strength of the assembled lens group.

[0079] Wherein, the process of embedding a plurality of lenses into the lens barrel in sequence in step 1) comprises: inverting the lens barrel, embedding the first lens into the first step inside the lens barrel, then embedding the second lens into the second step inside the lens barrel, and then embedding the next lens into the next step, and repeating until all lenses are embedded into the lens barrel. The structural areas of two adjacent lenses can directly support each other, or can support each other through a spacer 214 (such as a SOMA sheet). When the structural areas of two adjacent lenses support each other through the spacer 214, the step of arranging the spacer 214 is added to the embedding process of the two lenses. For example, the previous lens is first embedded in the lens barrel, and then the spacer 214 is arranged on the surface of the structural area of ​​the previous lens, and then the next lens is embedded in the lens barrel.

[0080] Furthermore, in some embodiments of the present invention, the step 2) includes any one or more of sub-steps a), b), and c), and the sub-steps a), b), and c) are as follows respectively.

[0081] a) For two adjacent lenses, during the process of embedding the two lenses into the lens barrel, the adhesive material 215 is arranged between the two lenses. That is, for two adjacent lenses, after the first lens is embedded, the adhesive material 215 is arranged on the surface of the structure area of ​​the lens (referring to the first lens) (the lens barrel and the lens are usually inverted during the embedding step, so the surface here is usually the bottom surface). Then the second lens is embedded.

[0082] In one example, the glue material 215 may be glue 215a. Preferably, to prevent the glue 215a from contaminating the optical zone, the glue 215a may be arranged in a groove formed between the spacer 214 and the lens (referring to the previous lens). The spacer 214 may have a Figure 4 The recessed portion 214a shown in the figure forms a groove with the lens. The method for arranging the glue 215a may include: after embedding the previous lens, arranging a spacer on the surface of the structural area of ​​the previous lens, the spacer having a recessed portion 214a, wherein the recessed portion 214a is recessed from outside to inside along a direction perpendicular to the optical axis, and the area of ​​the surface of the previous lens corresponding to the position of the recessed portion 214a is exposed; then arranging the glue 215a in the area corresponding to the position of the recessed portion 214a; and finally embedding the next lens.

[0083] In another example, the adhesive material may be an adhesive film 215b. The adhesive film 215b may be made into the shape of the spacer 214 to replace the function of the spacer 214. For example, the adhesive film 215b may be made opaque (for example, set to black), so that the adhesive film 215b has the function of blocking light, thereby forming an aperture between the lenses to suppress stray light from interfering with the imaging result. On the other hand, since the adhesive film 215b has adhesive properties, when the lenses are assembled, the adhesive film 215b is subjected to the pressure of the adjacent lenses and plays the role of bonding the lenses, thereby reinforcing the structural strength of the lens assembly.

[0084] In another example, the plurality of lenses forming the lens group include: Fig.11 The adjacent first embedded lens 10 and the second embedded lens 20 are shown. The structural area of ​​the first embedded lens 10 has a first embedded protrusion 11, and the structural area of ​​the second embedded lens 20 has a second embedded protrusion 21. After the first embedded lens 10 (i.e., the previous lens) is embedded, glue 215a is arranged at a position close to the inner side surface of the first embedded protrusion 11 on the surface of the structural area of ​​the first embedded lens 10. Then the second embedded lens 20 is embedded in the lens barrel, and the first embedded protrusion 11 and the second embedded protrusion 21 are staggered with each other, so that the glue 215a is located in the embedded gap formed between the inner side surface of the first embedded protrusion 11 and the outer side surface of the second embedded protrusion 21.

[0085] b) For two adjacent lenses, after the previous lens is embedded, glue 215a is arranged between the lens (the previous lens) and the lens barrel, and then the next lens is embedded. For ease of description, the lens bonded to the lens barrel by glue 215a is sometimes referred to as an embedded reinforcement lens.

[0086] like Figure 2 As shown, in one example, the outer side surface of the embedded reinforced lens may include an inclined surface (or called an inclined segment), which may form a wedge-shaped gap with the inner side surface of the lens barrel (such as the step side wall 211a), and glue 215a may be arranged in the wedge-shaped gap to reinforce the structural strength of the lens group. Fig. 9 Another example of bonding reinforcement between an embedded reinforcement lens and a lens barrel is shown. Fig. 9 In another example, the structural area for embedding the reinforced lens may include a protrusion, and the outer side surface of the protrusion and the inner side surface of the lens barrel may form a glue-containing groove 213. Specifically, Fig. 9 The outer side surface of the middle protrusion, the step surface 211b of the lens barrel and the step side wall 211a together form the glue containing groove 213. Glue 215a is arranged in the glue containing groove 213.

[0087] c) After two (or more) adjacent lenses are embedded in the lens barrel, glue 215a is arranged through the guide channel set on the inner side 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.

[0088] refer to Figure 6 The guide channel is connected to at least two adjacent steps of the multi-step steps 211 of the lens barrel, so as to allow the glue 215a to flow between the at least two adjacent steps. Figure 7 , the guide channel can be a guide groove 212, which is a recessed structure located on the inner side of the lens barrel. The gap between the guide groove 212 and the outer side of the lens can be filled with glue 215a to form a structural reinforcement for the assembled lens group. In this embodiment, the glue material 215 can be UV glue / UV thermosetting glue, thermosetting glue, moisture curing glue, anaerobic glue or solvent volatilization curing glue. The area where the glue 215a is arranged is the edge area of ​​the lens, and the edge area is far away from the optical zone of the lens. In this embodiment, the glue material 215 has a relatively low viscosity, for example, a viscosity of less than 500. The viscosity represents the dilution degree of the glue 215a, and the lower the viscosity, the better the fluidity. The thixotropic coefficient of the glue 215a is within 1.2. The thixotropic coefficient represents thixotropy, and thixotropy refers to the characteristic that the shear stress of the glue 215a (or glue liquid) decreases with time under a certain shear rate. The glue 215a with a thixotropic coefficient of less than 1.2 is specifically characterized in the gluing process as follows: when agitated, the viscosity of the glue drops rapidly, making it easy to apply; when stopped, the viscosity of the glue increases immediately and does not flow randomly, making it thinner in use and easier to apply. In this embodiment, after multiple lenses are embedded in the lens barrel, the guide channel can be used to arrange the glue 215a between the lenses.

[0089] It should be noted that the above sub-steps a), b), and c) correspond to several different methods of reinforcing the lens group using adhesive materials. During the assembly process of the lens group, one of these reinforcing methods can be used alone, or multiple of the above reinforcing methods can be used in combination.

[0090] The following will further introduce the active calibration process used in the optical lens or camera module assembly method.

[0091] The active calibration described in the present application can adjust the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. Fig. 12AThe relative position adjustment method in active calibration in one embodiment of the present invention is shown. In this adjustment method, the first lens component 100 (or the first lens 101) can move relative to the second lens component 200 along the x, y, and z directions (that is, the relative position adjustment in this embodiment has three degrees of freedom). The z direction is the direction along the optical axis, and the x and y directions are the directions perpendicular to the optical axis. The x and y directions are both in an adjustment plane P, and the translation in the adjustment plane P can be decomposed into two components in the x and y directions.

[0092] Fig. 12B FIG. 2 shows the rotation adjustment in active calibration of another embodiment of the present invention. In this embodiment, the relative position adjustment has Fig. 12A In addition to the three degrees of freedom, a rotational degree of freedom, i.e., adjustment in the r direction, is added. In this embodiment, the adjustment in the r direction is a rotation within the adjustment plane P, i.e., a rotation around an axis perpendicular to the adjustment plane P.

[0093] Further, Fig. 12C The figure shows a relative position adjustment method with v and w direction adjustments added in the active calibration of another embodiment of the present invention. The v direction represents the rotation angle of the xoz plane, the w direction represents the rotation angle of the yoz plane, and the rotation angles of the v direction and the w direction can be synthesized into a vector angle, which represents the overall tilt state. In other words, by adjusting the v direction and the w direction, the tilt posture of the first lens component 100 relative to the second lens component 200 (that is, the tilt of the optical axis of the first lens component 100 relative to the optical axis of the second lens component 200) can be adjusted.

[0094] The adjustment of the six degrees of freedom of x, y, z, r, v, and w may affect the imaging quality of the optical system (for example, the resolution). In other embodiments of the present invention, the relative position adjustment method may be to adjust only any one of the six degrees of freedom, or a combination of any two or more thereof.

[0095] Further, in one embodiment, in the active calibration step, the adjustment of the relative positions of the first lens component and the second lens component includes translation on the adjustment plane, that is, movement in the x and y directions.

[0096] Further, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component 100 and the second lens component 200 further includes: adjusting and determining the angle between the axis of the first lens component 100 and the axis of the second lens component 200 according to the measured resolution of the optical system, that is, the adjustment in the w and v directions. In the assembled optical lens or camera module, the axis of the first lens component 100 and the axis of the second lens component 200 may have a non-zero angle.

[0097] Furthermore, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component 100 and the second lens component 200 also includes: moving the first lens component 100 in a direction perpendicular to the adjustment plane (i.e., adjustment in the z direction), and determining the relative position between the first lens component 100 and the second lens component 200 in the direction perpendicular to the adjustment plane according to the measured resolution of the optical system.

[0098] Further, in one embodiment, the first lens component 100 may not have the first lens barrel 110. For example, the first lens component 100 may be composed of a single first lens 120. Before active calibration, corresponding pre-positioning is first performed so that there is a gap between the bottom surface of the first lens 120 and the top surface of the second lens component 200; then active calibration is performed, and then the adhesive is arranged in the gap and the adhesive is cured. In this embodiment, the first lens 120 may be formed by a plurality of sub-lenses that are interlocked to form an integral body. In this embodiment, the side and top surfaces of the non-optical surface of the first lens 120 that are not used for imaging may form 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.

[0099] In one embodiment, in the active calibration step, the second lens component 200 may be fixed, the first lens component 100 may be clamped by a fixture, and the first lens component 100 may be moved under the drive of a six-axis motion mechanism connected to the fixture, thereby realizing the relative movement of the first lens component 100 and the second lens component 200 in the above six degrees of freedom. The fixture may be supported or partially supported on the side of the first lens component 100, thereby clamping the first lens component 100 and performing position adjustment in multiple degrees of freedom.

[0100] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other.

Claims

1. A lens assembly, characterized in that: include: Lens tube; and A plurality of lenses, each of which has an optical zone and a structural zone surrounding the optical zone, wherein the plurality of lenses are embedded in the lens barrel to form a lens group, and a glue material is provided between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel to reinforce the structural strength of the assembled lens group; The inner side of the lens barrel has multiple steps, and the multiple lenses are sequentially embedded in the multiple steps; each of the multiple steps includes 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 adhesive material is glue, and the inner side of the lens barrel has a guide channel, which is connected to at least two adjacent steps of the multiple steps so as to allow glue to flow between the at least two adjacent steps, and the guide channel is filled with the adhesive material.

2. The lens assembly according to claim 1, wherein: The plurality of lenses include three lenses located at the front end, and the adhesive material is provided between at least two of the three lenses located at the front end and / or between at least one of the three lenses located at the front end and the lens barrel.

3. The lens assembly according to claim 2, wherein: The plurality of lenses include two adjacent bonding and reinforcement lenses, and the adhesive material is disposed between the structural areas of the two adjacent bonding and reinforcement lenses.

4. The lens assembly according to claim 2, wherein: The multiple lenses include adjacent first and second interlocking lenses, the structural area of ​​the first interlocking lens has a first interlocking protrusion, the structural area of ​​the second interlocking lens has a second interlocking protrusion, the first interlocking protrusion and the second interlocking protrusion are staggered with each other, and the adhesive is arranged in an interlocking gap formed between the inner side surface of the first interlocking protrusion and the outer side surface of the second interlocking protrusion.

5. The lens assembly according to claim 2, wherein: The adhesive material includes glue and / or adhesive film.

6. The lens assembly according to claim 5, characterized in that: When the adhesive material is glue, the glue has a thixotropic coefficient within 1.2 and a viscosity below 500.

7. The lens assembly according to claim 5, characterized in that: When the adhesive material is glue, the plurality of lenses include two adjacent bonding and reinforcement lenses, a spacer is provided between the two adjacent bonding and reinforcement lenses, the spacer has a notch and the notch accommodates the glue.

8. The lens assembly according to claim 5, characterized in that: When the adhesive material is an adhesive film, the plurality of lenses include two adjacent adhesively reinforced lenses, and the two adjacent adhesively reinforced lenses are bonded to each other via the adhesive film.

9. The lens assembly according to claim 1, wherein: The plurality of lenses include an embedded reinforcement lens, and the adhesive material is disposed between the embedded reinforcement lens and the lens barrel.

10. The lens assembly according to claim 9, characterized in that: The guide channel is a guide groove, and the gap between the guide groove and the outer side surface of the embedded reinforced lens is filled with the adhesive material.

11. The lens assembly according to claim 1, wherein: The adhesive material is arranged in a ring shape, or the adhesive material is distributed at a plurality of points in a ring shape.

12. The lens assembly according to claim 1, wherein: The adhesive material is UV adhesive, UV thermosetting adhesive, thermosetting adhesive, moisture-curing adhesive, anaerobic adhesive or solvent-curing adhesive.

13. An optical lens, characterized in that: include: A first lens component including at least one first lens element; A second lens component comprises a second lens barrel and at least one second lens installed in the second lens barrel, wherein the at least one second lens and the at least one first lens together constitute an imageable optical system; as well as An active calibration adhesive, located between the first lens component and the second lens component, and adapted to support the first lens component and the second lens component so that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by the active calibration; Wherein, the second lens component is the lens group assembly according to any one of claims 1 to 12, 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.

14. The optical lens according to claim 13, characterized in that: The first lens component further includes a first lens barrel, and the at least one first lens is installed in the first lens barrel.

15. The optical lens according to claim 14, characterized in that: The first lens component is the lens group assembly, wherein the first lens 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.

16. The optical lens according to claim 13, characterized in that: The first lens component is located at the front end of the optical lens.

17. The optical lens according to claim 13, characterized in that: An axis of the first lens component and an axis of the second lens component have a non-zero angle therebetween.

18. A camera module, characterized in that: A lens group comprising any one of claims 1 to 12.

19. A camera module, characterized in that: An optical lens comprising any one of claims 13-17.

20. A method for assembling a lens group, characterized in that: include: 1) embedding a plurality of lenses in sequence into a lens barrel having a plurality of steps on the inner side to form a lens group; as well as 2) during the execution of step 1) or after step 1) is completed, adding adhesive between at least two lenses of the plurality of lenses and / or between at least one lens of the plurality of lenses and the lens barrel to reinforce the structural strength of the assembled lens group; Wherein, the step 2) includes sub-steps: c) After adjacent lenses among the plurality of lenses are embedded in the lens barrel, glue is arranged through a guide channel arranged on the inner side of the lens barrel, so that the glue enters the gap between the structural areas of the adjacent lenses along the guide channel.

21. The lens group assembly method according to claim 20, characterized in that: The step 2) includes the following sub-steps: a) For two adjacent lenses among the plurality of lenses, after the previous lens is embedded, adhesive is arranged on the surface of the structure area of ​​the previous lens, and then the next lens is embedded.

22. The lens group assembly method according to claim 20, characterized in that: The step 2) includes the following sub-steps: b) For two adjacent lenses among 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.

23. The lens group assembly method according to claim 21, characterized in that: In the step a), the adhesive material is glue, and the step a) further comprises: after embedding the previous lens, arranging a spacer on the surface of the structural area of ​​the previous lens, the spacer having a recessed portion, wherein the recessed portion is recessed from outside to inside along 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 is exposed; then arranging the glue in the area corresponding to the position of the recessed portion; and finally embedding the next lens.

24. The lens group assembly method according to claim 21, characterized in that: In the step a), the adhesive material is an adhesive film, and the adhesive film forms an aperture.

Images