Integrated lens barrel, optical lens, camera module and assembly method

Abstract

The present invention provides an integrated lens barrel, comprising: a cylindrical body having an inner side surface and a central axis; and an inner extension portion, which extends from the inner side surface toward the central axis and has a light hole in the center, the inner extension portion divides the inner side surface into a first segment and a second segment, the top surface of the inner extension portion and the first segment form a first groove suitable for accommodating a first lens group, and the bottom surface of the inner extension portion and the second segment form a second groove suitable for accommodating a second lens group. The present invention also provides a corresponding optical lens, a camera module, and an assembly method of the optical lens and the camera module. The present invention can reduce the variation source of the optical lens based on the active calibration process, thereby improving the imaging quality and yield.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology, and in particular to an integrated lens barrel, an optical lens, a camera module and an 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 matching 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 the 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 position 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 position. 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 make real-time adjustments to various aberrations of the camera module 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, an integrated lens barrel is provided, comprising: a cylindrical body having an inner side surface and a central axis; and an inner extension portion, the inner extension portion extending from the inner side surface toward the central axis and having a light-through hole in the center, the inner extension portion dividing the inner side surface into a first segment and a second segment, the top surface of the inner extension portion and the first segment forming a first groove suitable for accommodating a first lens group, and the bottom surface of the inner extension portion and the second segment forming a second groove suitable for accommodating a second lens group.

[0009] The first segment is in a closed ring shape when viewed from above.

[0010] The first segment has a concave segment, and the concave segment is recessed from the inner side surface of the cylindrical body toward the outer side surface of the cylindrical body.

[0011] The first segment is in the shape of a ring with a gap when viewed from a top view.

[0012] Wherein, the top surface of the inner extension portion is suitable for arranging glue material.

[0013] The second segment has multiple steps, which are suitable for sequentially embedding multiple second lenses to assemble the second lens group; the bottom surface of the inner extension portion is suitable for supporting the second lens group, and the top surface of the inner extension portion is suitable for arranging adhesive to bond the first lens group.

[0014] According to another aspect of the present invention, an optical lens is also provided, comprising: an integrated lens barrel, the integrated lens barrel comprising a cylindrical main body, which has an inner side surface and a central axis; and an inner extension portion, the inner extension portion extends inward from the inner side surface and has a light-through hole in the center, the inner extension portion divides the inner side surface into a first segment and a second segment, wherein the top surface of the inner extension portion and the first segment constitute a first groove, and the bottom surface of the inner extension portion and the second segment constitute a second groove; a first lens group, which includes a single first lens or a plurality of first lenses assembled together by fitting or bonding between the lenses; a second lens group, which includes at least one second lens, the second lens group is supported by the bottom surface of the inner extension portion and placed in the second groove, the first lens group and the second lens group together constitute an imageable optical system; and a first adhesive material, which is located between the first lens group and the first groove.

[0015] The first adhesive material is suitable for supporting and fixing the first lens group and the integrated lens barrel after curing, so that the relative positions of the first lens group and the second lens group are maintained at the relative positions determined by active calibration based on the imaging result of the optical system.

[0016] The first segment is in a closed ring shape when viewed from above.

[0017] The first segment has a concave segment, and the concave segment is recessed from the inner side surface of the cylindrical body toward the outer side surface of the cylindrical body.

[0018] Wherein, a shading plate is bonded to the top surface of the cylindrical body, the shading plate forms an aperture, and no adhesive material is filled between the shading plate and the first lens group.

[0019] The first lens group includes an optical zone and a structural zone surrounding the optical zone, a shading plate is bonded to the top surface of the structural zone, the shading plate forms an aperture, and no adhesive is filled between the shading plate and the top surface of the cylindrical body.

[0020] The first segment is in the shape of a ring with a gap when viewed from a top view.

[0021] The top surface of the cylindrical body is bonded with a shading plate to form an aperture, the shading plate has a side baffle adapted to the notch, and no adhesive is filled between the shading plate and the first lens group.

[0022] The first lens group includes an optical zone and a structural zone surrounding the optical zone, a shading plate is bonded to the top surface of the structural zone to form an aperture, the shading plate has a side baffle adapted to the notch, and no adhesive is filled between the shading plate and the top surface of the cylindrical body.

[0023] Wherein, the shading plate bonded thereto is made of metal material or a material suitable for being used as an appearance surface.

[0024] The light shielding plate is made of the same material as the integrated lens barrel, and the adhesive material for bonding the light shielding plate is made of the same material as the first adhesive material.

[0025] The first lens group includes an optical zone and a structural zone surrounding the optical zone, a light shielding layer is attached to the outer surface of the structural zone, and the top surface of the structural zone is higher than the top surface of the integrated lens barrel.

[0026] The light shielding layer blocks visible light and transmits non-visible light of a specific wavelength band, and the non-visible light of the specific wavelength band is light that triggers the curing reaction of the first adhesive material.

[0027] The second segment has a plurality of steps, and the plurality of steps are suitable for sequentially embedding a plurality of second lenses to assemble the second lens group.

[0028] Wherein, the cylindrical body and the inner extension portion are integrally formed.

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

[0030] According to another aspect of the present invention, there is also provided an optical lens assembly method, comprising: preparing an integrated lens barrel, the integrated lens barrel comprising a cylindrical body having an inner side surface and a central axis; and an inner extension portion, the inner extension portion extending inwardly from the inner side surface and having a light-through hole in the center, the inner extension portion dividing the inner side surface into a first segment and a second segment, wherein the top surface of the inner extension portion and the first segment form a first groove, and the bottom surface of the inner extension portion and the second segment form a second groove; installing a second lens group on the integrated lens barrel to form a second lens component, wherein the second lens group comprises at least one second lens, the second lens group rests on the bottom surface of the inner extension portion and The method comprises the steps of placing the lens group in the second groove; preparing a first lens group, wherein the first lens group includes a single first lens or a plurality of first lenses assembled together by the interaction between the lenses themselves; placing the first lens group in the first groove, and then pre-positioning the first lens group and the second lens group so that the first lens group and the second lens group constitute an imageable optical system; actively calibrating the relative positions of the first lens group and the second lens group based on the measured imaging results; and bonding the first lens group to the first groove by means of a first adhesive material, and keeping the first lens group and the second lens group at the relative positions determined by the active calibration, thereby obtaining the optical lens.

[0031] The first segment is in a closed ring shape when viewed from above; in the pre-positioning step and the active calibration step, the first lens group is clamped and moved by a fixture, wherein a gap for accommodating the fixture is provided between the first segment and the side surface of the first lens group.

[0032] The first segment is in a ring shape with a notch when viewed from a top view; in the pre-positioning step and the active calibration step, the first lens group is clamped and moved by a clamp, wherein the clamp extends into the integrated lens barrel through the notch and clamps the first lens group.

[0033] Wherein, the second segment has multiple steps; in the step of installing the second lens group on the integrated lens barrel, the at least one second lens is sequentially embedded into the multiple steps to assemble the second lens group and constitute the second lens component.

[0034] Wherein, in the step of bonding the first lens group and the first groove by means of a first adhesive material, the first adhesive material is arranged only between the bottom surface of the first lens group and the top surface of the inner extension portion; or the first adhesive material is arranged both between the bottom surface of the first lens group and the top surface of the inner extension portion and between the side surface of the first lens group and the first segment.

[0035] The first lens group includes an optical zone and a structural zone surrounding the optical zone; the assembly method further includes: adhering a shading plate to the top surface of the structural zone, and no adhesive is filled between the shading plate and the top surface of the cylindrical body.

[0036] Wherein, the assembling method further comprises: adhering a light shielding plate to the top surface of the cylindrical body, and no adhesive material is filled between the light shielding plate and the top surface of the first lens group.

[0037] After the step of bonding the first lens group and the first groove by means of the first adhesive is completed, the step of adhering the light shielding plate is performed.

[0038] The step of bonding the first lens group and the first groove by means of the first adhesive material comprises the steps of applying adhesive, exposing and baking which are performed in sequence; and the step of adhering the light shielding plate is performed after the exposure step and before the baking step.

[0039] According to another aspect of the present invention, a camera module assembly method is also provided, comprising: assembling an optical lens using any of the aforementioned optical lens assembly methods; and assembling a camera module based on the optical lens.

[0040] Compared with the prior art, the present invention has at least one of the following technical effects:

[0041] 1. The present invention can reduce the sources of variation of optical lenses based on active calibration processes, thereby improving imaging quality and yield.

[0042] 2. The present invention can use an integrated lens barrel instead of a split lens barrel, thereby improving the mechanical reliability of the optical lens based on active calibration and suppressing optical performance variations caused by baking, high temperature and high humidity, and the like.

[0043] 3. The present invention can attach a shading layer that does not transmit visible light but can project non-visible light of a specific band to the first lens group, so that the exposure can be transmitted from directly above when the adhesive is solidified. Compared with side exposure, this exposure method is more uniform and helps to improve the imaging quality of the optical lens.

[0044] 4. The present invention can use a metal shading plate to reduce the height of the optical lens or camera module.

[0045] 5. The present invention can use the shading plate as the exterior surface, thereby reducing the height of the optical lens or camera module and reducing the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Exemplary embodiments are shown in the referenced drawings. The embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

[0047] Figure 1 A cross-sectional schematic diagram of an optical lens 1000 according to an embodiment of the present invention is shown;

[0048] Figure 2 FIG. 4 is a cross-sectional schematic diagram of an optical lens 1000 in another embodiment of the present invention;

[0049] Figure 3 An optical lens based on active calibration using a split lens barrel in a comparative example is shown;

[0050] Figure 4 A schematic top view of an integrated lens barrel 300 according to an embodiment of the present invention is shown;

[0051] Figure 5 Shows Figure 4 The cross-sectional schematic diagram of the integrated lens barrel 300 is shown;

[0052] Figure 6 A schematic top view of an integrated lens barrel 300 according to another embodiment of the present invention is shown;

[0053] Figure 7 Shows Figure 6 The cross-sectional schematic diagram of the integrated lens barrel 300 is shown;

[0054] Figure 8 An embodiment of the present invention is shown. Figure 6 A schematic diagram of an optical lens of the integrated lens barrel 300 is shown;

[0055] Fig. 9 An optical lens according to a variant embodiment of the present invention is shown;

[0056] Fig.10 An optical lens according to another variant embodiment of the present invention is shown;

[0057] Fig.11 A schematic top view of an integrated lens barrel 300 according to a variant embodiment of the present invention is shown;

[0058] Fig.12 An optical lens according to another variant embodiment of the present invention is shown;

[0059] Fig.13 An optical lens according to another variant embodiment of the present invention is shown;

[0060] Fig.14A The relative position adjustment method in active calibration in one embodiment of the present invention is shown;

[0061] Fig. 14B shows the rotation adjustment in active calibration of another embodiment of the present invention;

[0062] Fig. 14C 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

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with 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.

[0069] 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.

[0070] Figure 1 FIG. 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 an integrated lens barrel 300, a first lens group 100, a second lens group 200 and a first adhesive 400. The integrated lens barrel 300 includes a cylindrical body 301 and an inner extension portion 302 extending from the inner side of the cylindrical body 301. The cylindrical body 301 and the inner extension portion 302 are integrally formed. Figure 1 The cylindrical body 301 has an inner side surface and a central axis. The inner extension portion 302 extends from the inner side surface toward the central axis and has a light hole 302a in the center. The inner extension portion 302 divides the inner side surface into a first segment 3011 and a second segment 3012, wherein the top surface of the inner extension portion 302 and the first segment 3011 form a first groove, and the bottom surface of the inner extension portion 302 and the second segment 3012 form a second groove. In this embodiment, the first lens group 100 is composed of a single first lens. It should be noted that the present invention is not limited to this. For example, Figure 2 A cross-sectional schematic diagram of an optical lens 1000 in another embodiment of the present invention is shown. In this embodiment, the first lens group 100 can be composed of a plurality of first lenses assembled together by relying on the interaction of the lenses themselves (for example, composed of a plurality of first lenses that are interlocked or bonded to each other). The second lens group 200 includes at least one second lens, the second lens group 200 is supported on the bottom surface of the inner extension portion 302 and is placed in the second groove, and the first lens group 100 and the second lens group 200 together constitute an imageable optical system. The first adhesive 400 is located between the first lens group 100 and the first groove. The first adhesive 400 is suitable for supporting and fixing the first lens group 100 and the integrated lens barrel 300 after curing, so that the relative position of the first lens group 100 and the second lens group 200 is maintained at the relative position determined by active calibration based on the imaging result of the optical system.

[0071] In the above embodiment, the integrated lens barrel 300 is used instead of the split lens barrel, which improves the mechanical reliability of the optical lens based on active calibration and can suppress the variation of optical performance caused by baking, high temperature and high humidity conditions (due to reducing the variation source under baking and other conditions). Figure 3 An optical lens based on active calibration using a split lens barrel in a comparative example is shown. Figure 3The optical lens comprises a first lens component and a second lens component, wherein the first lens component comprises a first lens barrel 800 and a first lens installed in the first lens barrel 800, and the second lens component comprises a second lens barrel 900 and a plurality of second lenses installed in the second lens barrel 900. The first lens component and the second lens component are each actively calibrated as a whole and the relative position between the two is determined, and then the first lens component and the second lens component are bonded with a first adhesive 400 to support and fix the first lens component and the second lens component. Under this scheme, the structural strength of the lens barrel (especially the first lens barrel 800) is relatively insufficient, resulting in low mechanical reliability. Under baking, high temperature and high humidity conditions, the first adhesive 400 and the lens barrel (especially the first lens barrel 800) may both vary, resulting in a change in the relative position of the first lens and the second lens, thereby losing (or reducing) the optical performance obtained by active calibration (i.e., optical performance variation). The integrated lens barrel 300 adopted by the present invention can overcome the above problems.

[0072] Further, Figure 4 FIG. 3 is a top view of an integrated lens barrel 300 according to an embodiment of the present invention. Figure 4 In one embodiment of the present invention, the first segment 3011 is in a closed ring shape when viewed from above. The first segment 3011 has a concave segment 3011a, which is concave from the inner side of the cylindrical body 301 to the outer side of the cylindrical body 301. Figure 5 Shows Figure 4 The cross-sectional view of the integrated lens barrel 300 is shown in FIG. Figure 1 , Figure 4 and Figure 5 It can be seen that the first segment 3011 of the inner side of the integrated lens barrel 300 has a concave section 3011a, and there is a gap between the concave section 3011a and the outer side of the first lens group 100, and the gap can accommodate the clamping claw so that the clamping claw clamps the first lens group 100 in the first groove 303 for active calibration. Figure 5 In the embodiment, the second lens group 200 has been embedded in the second groove 304 of the integrated lens barrel 300 .

[0073] Further, Figure 6 FIG. 3 is a top view of an integrated lens barrel 300 according to another embodiment of the present invention. Figure 6 In another embodiment of the present invention, the first segment 3011 is in a ring shape with a gap when viewed from a top view. Since the first segment 3011 has a gap 3011b, the integrated lens barrel 300 can avoid the clamping claws so that the clamping claws clamp the first lens group 100 in the first groove for active calibration. Figure 7 Shows Figure 6FIG. 3 is a cross-sectional schematic diagram of an integrated lens barrel 300 . Figure 8 An embodiment of the present invention is shown. Figure 6 Schematic diagram of the optical lens of the integrated lens barrel 300 shown.

[0074] Further, still refer to Figure 1 In one embodiment of the present invention, the second segment 3012 has multiple steps, and the multiple steps are suitable for sequentially embedding multiple second lenses to assemble the second lens group 200. In other words, after the assembly is completed, the integrated lens and the multiple second lenses form an integrated second lens component, and the first lens group 100 alone constitutes the first lens component. The active calibration mentioned above is to calibrate the relative positions of the first lens component and the second lens component.

[0075] Further, still refer to Figure 1 In one embodiment of the present invention, a light shielding layer 101 is attached to the surface of the structure area 103 of the first lens group 100 (including the top and side surfaces of the structure area 103, and sometimes further including the bottom surface of the structure area 103). The structure area 103 is the area surrounding the optical area 102. The optical area 102 is the area of ​​the lens group for optical imaging. The light shielding layer 101 can be a coating that does not transmit visible light but only transmits ultraviolet light. In this way, the first adhesive 400 can be selected from an adhesive that is triggered and cured by ultraviolet light. The coating (i.e., the light shielding layer 101) does not transmit visible light and can block stray light or act as a stop. Its structure is compact, and when the adhesive is cured, the exposure can be transmitted from the top (i.e., ultraviolet light is transmitted from the light shielding layer 101), which is more uniform than side exposure. In contrast, in the split lens barrel solution of the aforementioned comparative example, due to the obstruction of the first lens barrel 800 above, it is necessary to expose from the side to cure the first adhesive 400. It should be noted that the first adhesive material 400 may also be an adhesive material that is triggered to cure by other wavelengths. In this case, the light shielding layer 101 does not transmit visible light but only transmits light of the wavelength that triggers the curing of the first adhesive material 400 .

[0076] Further, Fig. 9 The optical lens of a modified embodiment of the present invention is shown. Figure 1On the basis of the embodiment of the present invention, a shading plate 500 is added. Accordingly, in this embodiment, the first lens (or the first lens group 100) may not be attached with a shading layer. Specifically, in this embodiment, the shading plate 500 may be bonded to the top surface of the integrated lens barrel 300 (referring to the top surface of the cylindrical body 301). The shading plate 500 does not contact the first lens (a gap is retained between the two, and no adhesive is used for bonding). In this embodiment, the shading mechanism (i.e., the shading plate 500) does not participate in the assembly process involving active calibration, so there is no need to measure the height, the surface roughness does not need to be made very small to ensure the height measurement accuracy, and the scratching is reduced (the smoother, the easier it is to scratch). On the other hand, since the shading mechanism can be separated from the lens (as a comparison, the shading function is realized by the first lens barrel 800 in the aforementioned comparative example), since it is no longer bonded to the lens, the selection of its material is no longer restricted by the lower group lens barrel (i.e., the second lens barrel) (as a comparison, in the aforementioned comparative example, the linear expansion coefficient of the material on both sides of the adhesive bonding is close, which can reduce the performance variation of the optical system under conditions such as baking). Therefore, the material of the shading plate 500 can be metal, so that the shading plate 500 can be made thinner. The material of the shading plate 500 can also be PET polyester, which has stable mechanical and chemical properties and can be directly used as the appearance surface. In contrast, in the above comparative example, the final optical lens product needs to add a PET polyester sheet on the outermost of the lens as the appearance surface.

[0077] Further, Fig.10 The optical lens of another variant embodiment of the present invention is shown. Figure 1 On the basis of the embodiment of FIG. 1 , a light shielding plate 500 is added. In addition, in this embodiment, the first lens (or the first lens group 100) may not be attached with a light shielding layer. Fig. 9 The difference between the illustrated embodiments is that, in this embodiment, the light shielding plate 500 is bonded to the top surface of the structural area 103 of the first lens (or the first lens group 100). An air gap is reserved between the light shielding plate 500 and the top surface of the cylindrical body 301, that is, no adhesive is arranged between the two. In this embodiment, the light shielding mechanism (i.e., the light shielding plate 500) does not participate in the assembly process involving active calibration, so it does not need to measure the height, the surface roughness does not need to be made very small to ensure the height measurement accuracy, and the scratch defect is reduced (the smoother, the easier it is to scratch). The light shielding mechanism of this embodiment is preferably made of the same material as the integrated lens barrel 300, and the adhesive is also selected from the same material as the integrated lens barrel and the upper lens group, that is, the adhesive 501 for bonding the light shielding mechanism is made of the same material as the first adhesive 400. The purpose is to make the adhesive variation on both sides of the first lens group 100 consistent under conditions such as baking, so as to minimize the degradation of the optical system performance.

[0078] Further, Fig.11A schematic top view of an integrated lens barrel 300 of a modified embodiment of the present invention is shown. In this embodiment, the first segment 3011 of the integrated lens barrel 300 is annular and is not provided with a concave segment. In this embodiment, the diameter of the first segment 3011 can be larger than the diameter of the outer side surface of the first lens (or the first lens group 100), so that a space for accommodating the clamping claw is formed between the first segment 3011 and the outer side surface of the first lens (or the first lens group 100), thereby avoiding the clamping position of the clamping claw. In the position where the clamping claw does not need to be avoided, the outer side surface of the first lens (or the first lens group 100) can be optionally applied with glue to bond with the integrated lens barrel 300.

[0079] Further, Fig.12 FIG. 2 shows an optical lens of another variant embodiment of the present invention. Figures 6-8 Compared with the embodiment shown in the figure, the difference is that a shading plate 500 is added, and the shading plate 500 has a side baffle 502 adapted to the notch of the first segment 3011. In this embodiment, the first lens (or the first lens group 100) may not be attached with a shading layer. Specifically, in this embodiment, the shading plate 500 can be bonded to the top surface of the cylindrical body 301. The shading plate 500 does not contact the first lens (a gap is reserved between the two, and no adhesive is used for bonding). In this embodiment, the shading mechanism (i.e., the shading plate 500) does not participate in the assembly process involving active calibration, so it does not need to measure the height, the surface roughness does not need to be made very small to ensure the height measurement accuracy, and the scratch defect is reduced. On the other hand, since the shading mechanism can be separated from the lens and is no longer bonded to the lens, the selection of its material is no longer restricted by the lower lens barrel (i.e., the second lens barrel). Therefore, the material of the shading plate 500 can be metal, so that the shading plate 500 can be made thinner. The material of the shading plate 500 can also be PET polyester, which has stable mechanical and chemical properties and can be directly used as the appearance surface. In contrast, in the above comparative example, the final optical lens product needs to add a PET polyester sheet on the outermost of the lens as the appearance surface.

[0080] Further, Fig.13 FIG. 2 shows an optical lens of another variant embodiment of the present invention. Figures 6-8 Compared with the embodiment shown in the figure, the difference is that a shading plate 500 is added, and the shading plate 500 has a side baffle 502 adapted to the notch of the first segment 3011. In this embodiment, the first lens (or the first lens group 100) may not be attached with a shading layer. Fig.12The area of ​​the embodiment shown is that, in this embodiment, the shading plate 500 is bonded to the top surface of the structural area 103 of the first lens (or the first lens group 100). An air gap is reserved between the shading plate 500 and the top surface of the cylindrical body 301, that is, no adhesive is arranged between the two. In this embodiment, the shading mechanism (i.e., the shading plate 500) does not participate in the assembly process involving active calibration, so it does not need to measure the height, the surface roughness does not need to be made very small to ensure the height measurement accuracy, and the scratch defect is reduced (the smoother the easier it is to scratch). In this embodiment, the shading mechanism is preferably bonded with the same material as the integrated lens barrel 300, and the adhesive is also selected as the same material as the integrated lens barrel and the upper lens group, that is, the adhesive 501 of the shading mechanism is the same as the first adhesive 400. The purpose is to make the adhesive variation on both sides of the first lens group 100 consistent under conditions such as baking, so as to minimize the degradation of the optical system performance.

[0081] Further, in one embodiment, the top surface of the inner extension portion 302 is suitable for arranging the adhesive material. For example, the inner extension portion 302 has a certain size in a direction perpendicular to the central axis to facilitate arranging the adhesive material.

[0082] According to another embodiment of the present invention, a camera module is also provided. The camera module may include the optical lens of any one of the above embodiments.

[0083] According to another embodiment of the present invention, there is also provided an optical lens assembly method, comprising the following steps.

[0084] S100, prepare an integrated lens barrel 300, the integrated lens barrel 300 comprises a cylindrical body 301, which has an inner side surface and a central axis; and an inner extension portion 302, the inner extension portion 302 extends inward from the inner side surface and has a light hole 302a in the center, the inner extension portion 302 divides the inner side surface into a first segment 3011 and a second segment 3012, wherein the top surface of the inner extension portion 302 and the first segment 3011 form a first groove, and the bottom surface of the inner extension portion 302 and the second segment 3012 form a second groove.

[0085] S200 , installing the second lens group 200 on the integrated lens barrel 300 to form a second lens component, wherein the second lens group 200 includes at least one second lens, and the second lens group 200 is supported by the bottom surface of the inner extension portion 302 and placed in the second groove.

[0086] S300 , preparing a first lens group 100 , wherein the first lens group 100 includes a single first lens or a plurality of first lenses assembled together by relying on the interaction of the lenses themselves.

[0087] S400, placing the first lens group 100 in the first groove, and then pre-positioning the first lens group 100 and the second lens component, so that the first lens group 100 and the second lens group 200 form an optical system capable of forming an image.

[0088] S500 , actively calibrating the relative positions of the first lens group 100 and the second lens group 200 based on the measured imaging result.

[0089] S600 , bonding the first lens group 100 and the first groove by means of the first adhesive material 400 , and keeping the first lens group 100 and the second lens group 200 at a relative position determined by active calibration, thereby obtaining the optical lens.

[0090] Among them, S300 can be executed in parallel with S100~S200.

[0091] Furthermore, in one embodiment, the first segment 3011 is in a closed ring shape when viewed from a top perspective, and in the pre-positioning step (S400) and the active calibration step (S500), the first lens group 100 is clamped and moved by a fixture, wherein a gap for accommodating the fixture is provided between the first segment 3011 and the side surface of the first lens group 100.

[0092] Furthermore, in one embodiment, the first segment 3011 is in a ring shape with a notch when viewed from a top perspective, and in the pre-positioning step (S400) and the active calibration step (S500), the first lens group 100 is clamped and moved by a clamp, wherein the clamp extends into the integrated lens barrel 300 through the notch and clamps the first lens group 100.

[0093] Furthermore, in one embodiment, the second segment 3012 has a plurality of steps, and in the step (S200) of installing the second lens group 200 in the integrated lens barrel 300, the at least one second lens is sequentially embedded into the plurality of steps to assemble the second lens group 200 and constitute the second lens component.

[0094] Further, in one embodiment, in the step (S600) of bonding the first lens group 100 and the first groove by means of the first adhesive 400, the first adhesive 400 is only arranged between the bottom surface of the first lens group 100 and the top surface of the inner extension 302. In another embodiment, in step S600, the first adhesive 400 is arranged between the bottom surface of the first lens group 100 and the top surface of the inner extension 302, and between the side surface of the first lens group 100 and the first segment 3011.

[0095] Furthermore, in one embodiment, the assembly method further includes step S700.

[0096] S700, attaching the light shielding plate 500 to the top surface of the first lens group 100, and no adhesive is filled between the light shielding plate 500 and the top surface of the cylindrical body 301. In this embodiment, the step of attaching the light shielding plate 500 (S700) can be performed after the step of bonding the first lens group 100 to the first groove by the first adhesive 400 (S600) is completed.

[0097] In another embodiment, step S700 may be replaced by step S700 ′.

[0098] S700', the light shielding plate 500 is adhered to the top surface of the cylindrical body 301, and no adhesive is filled between the light shielding plate 500 and the top surface of the first lens group 100. In this embodiment, the step of adhering the light shielding plate 500 (S700') can be performed after the step of adhering the first lens group 100 to the first groove by the first adhesive 400 (S600) is completed.

[0099] Further, in one embodiment, step S600 may include the steps of applying glue, exposing and baking, which are performed in sequence, and the step of adhering the light shielding plate 500 may be performed after the exposure step and before the baking step. The applying glue step is to arrange the first glue material 400 on the top surface of the inner extension 302, and the exposure step is to trigger the curing reaction of the first glue material 400 by ultraviolet rays (or light of other wavelengths), so that the first glue material 400 can temporarily support and fix the relative position of the first lens component and the second lens component (i.e., the relative position of the first lens group 100 and the integrated lens barrel 300). The baking step is to put the temporarily supported and fixed optical lens into an oven (or other equipment) for baking, so that the first glue material 400 is permanently cured, thereby improving the structural strength and reliability of the optical lens.

[0100] Furthermore, according to another embodiment of the present invention, a camera module assembly method is also provided, which includes assembling an optical lens using the optical lens assembly method of any of the aforementioned embodiments, and then installing the assembled optical lens on a photosensitive component to obtain a camera module product.

[0101] In this article, concepts such as lens barrel, integrated lens barrel, first lens barrel, and second lens barrel all refer to lens barrels that serve as black objects, and these lens barrels all have a light-shielding effect.

[0102] In the present invention, the integrated lens barrel 300 can be installed in an optical actuator (such as a motor). For example, the integrated lens barrel 300 can be installed on the inner side of the motor carrier, so as to form a whole with the motor. During active calibration, the first lens group 100 is used as a component (which can be regarded as a first lens component), the second lens group 200, the integrated lens barrel 300 and the motor are used as another component (which can be regarded as a second lens component), and the active calibration is performed between the two lens components.

[0103] The following will further introduce the active calibration process used in the optical lens or camera module assembly method.

[0104] 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.14A The 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 (which can also be the first lens) 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.

[0105] Fig. 14B 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.14A 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.

[0106] Further, Fig. 14C The figure shows a relative position adjustment method with added v and w direction adjustments 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 and w directions can be synthesized into a vector angle, which represents the overall tilt state. In other words, by adjusting the v and w directions, the tilt posture of the first lens component relative to the second lens component (that is, the tilt of the optical axis of the first lens component relative to the optical axis of the second lens component) can be adjusted.

[0107] The adjustment of the six degrees of freedom 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.

[0108] 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.

[0109] 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 further includes: adjusting and determining the angle between the axis of the first lens component and the axis of the second lens component according to the measured resolution of the optical system, that is, the adjustment in the directions of w and v. In the assembled optical lens or camera module, the axis of the first lens component and the axis of the second lens component may have a non-zero angle.

[0110] Furthermore, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component further includes: moving the first lens component in a direction perpendicular to the adjustment plane (i.e., adjustment in the z direction), and determining the relative position of the first lens component and the second lens component in the direction perpendicular to the adjustment plane according to the measured resolution of the optical system.

[0111] Further, in one embodiment, the first lens component may not have a first lens barrel. For example, the first lens component may be composed of a single first lens. Before active calibration, the first lens is pre-positioned so that there is a gap between the bottom surface of the first lens and the top surface of the second lens component; then active calibration is performed, and the adhesive is arranged in the gap and the adhesive is cured. In this embodiment, the first lens may be formed by a plurality of sub-lenses that are interlocked or bonded to form an integral body. In this embodiment, the side and top surfaces of the non-optical surface of the first lens that are not used for imaging may form a light shielding layer 101. The light shielding layer 101 may be formed by screen printing a light shielding material on the side and top surface of the first lens. Compared with the embodiment with an upper cover and the solution of a split lens barrel (black object), this embodiment can reduce the size of the camera module head (object side) that originally encroaches on the mobile phone screen, so that the camera module can be closer to the side wall (or other frame) of the mobile phone when installed in the mobile phone, achieving a higher screen-to-body ratio.

[0112] Further, still refer to Figure 1In one embodiment, the top surface of the structural area 103 of the first lens group 100 is higher than the top surface of the integrated lens barrel 300. The top surface refers to the end surface on the object side. This design can make the top surface of the lens barrel lower than the top surface of the lens. In this way, when the camera module is installed in the mobile phone, the lens barrel as a structural member protrudes less and occupies a smaller size of the screen, which is conducive to increasing the screen-to-body ratio. For example, when the camera module is used as a front camera, the lower top surface of the lens barrel helps to avoid the screen component, so that the screen extends to a position closer to the mobile phone frame, thereby increasing the screen-to-body ratio.

[0113] In one embodiment, in the active calibration step, the second lens component can be fixed, the first lens component can be clamped by a fixture, and the first lens component can be moved under the drive of a six-axis motion mechanism connected to the fixture, so as to achieve the relative movement of the first lens component and the second lens component in the above six degrees of freedom. The fixture can be supported or partially supported on the side of the first lens component, so as to clamp the first lens component and perform multi-degree-of-freedom position adjustment.

[0114] 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. An integrated lens barrel, characterized in that: include: a cylindrical body having an inner side and a central axis; as well as an inner extension portion, the inner extension portion extends from the inner side surface toward the central axis and has a light hole in the center, the inner extension portion divides the inner side surface into a first segment and a second segment, the top surface of the inner extension portion and the first segment form a first groove suitable for accommodating a first lens group, and the bottom surface of the inner extension portion and the second segment form a second groove suitable for accommodating a second lens group, The first lens group includes an optical zone and a structural zone surrounding the optical zone, and a top surface of the structural zone is higher than a top surface of the integrated lens barrel.

2. The one-piece lens barrel according to claim 1, characterized in that: The first segment is in a closed ring shape when viewed from a top view.

3. The one-piece lens barrel according to claim 1, characterized in that: The first segment has a concave segment, and the concave segment is concave from the inner side surface of the cylindrical body toward the outer side surface of the cylindrical body.

4. The one-piece lens barrel according to claim 3, characterized in that: The first segment is in a ring shape with a gap when viewed from a top view.

5. The one-piece lens barrel according to claim 1, characterized in that: The top surface of the inner extension portion is suitable for arranging glue material.

6. The one-piece lens barrel according to claim 1, characterized in that: The second segment has multiple steps, which are suitable for sequentially embedding multiple second lenses to assemble the second lens group; the bottom surface of the inner extension portion is suitable for supporting the second lens group, and the top surface of the inner extension portion is suitable for arranging adhesive to bond the first lens group.

7. An optical lens, characterized in that: include: An integrated lens barrel, comprising: a cylindrical body having an inner side and a central axis; and an inner extension portion, the inner extension portion extending inward from the inner side surface and having a light-through hole in the center, the inner extension portion dividing the inner side surface into a first segment and a second segment, wherein the top surface of the inner extension portion and the first segment form a first groove, and the bottom surface of the inner extension portion and the second segment form a second groove; A first lens group, which includes a single first lens or a plurality of first lenses assembled together by fitting or bonding the lenses; a second lens group, comprising at least one second lens, the second lens group being supported against the bottom surface of the inner extension portion and disposed in the second groove, the first lens group and the second lens group together forming an imageable optical system; and A first adhesive material is located between the first lens group and the first groove, The first lens group includes an optical zone and a structural zone surrounding the optical zone, and a top surface of the structural zone is higher than a top surface of the integrated lens barrel.

8. The optical lens according to claim 7, characterized in that: The first adhesive material is suitable for supporting and fixing the first lens group and the integrated lens barrel after curing, so that the relative positions of the first lens group and the second lens group are maintained at the relative positions determined by active calibration based on the imaging result of the optical system.

9. The optical lens according to claim 7, characterized in that: The first segment is in a closed ring shape when viewed from a top view.

10. The optical lens according to claim 9, characterized in that: The first segment has a concave segment, and the concave segment is concave from the inner side surface of the cylindrical body toward the outer side surface of the cylindrical body.

11. The optical lens according to claim 9, characterized in that: A light shielding plate is bonded to the top surface of the cylindrical body, the light shielding plate forms an aperture, and no adhesive material is filled between the light shielding plate and the first lens group.

12. The optical lens according to claim 9, characterized in that: The first lens group includes an optical zone and a structural zone surrounding the optical zone, a shading plate is bonded to the top surface of the structural zone, the shading plate forms an aperture, and no adhesive is filled between the shading plate and the top surface of the cylindrical body.

13. The optical lens according to claim 7, characterized in that: The first segment is in a ring shape with a gap when viewed from a top view.

14. The optical lens according to claim 13, characterized in that: A shading plate is bonded to the top surface of the cylindrical body to form an aperture, the shading plate has a side baffle adapted to the notch, and no adhesive material is filled between the shading plate and the first lens group.

15. The optical lens according to claim 13, characterized in that: The first lens group includes an optical zone and a structural zone surrounding the optical zone, the top surface of the structural zone is bonded with a shading plate to form an aperture, the shading plate has a side baffle adapted to the notch, and no glue is filled between the shading plate and the top surface of the cylindrical body.

16. The optical lens according to claim 11 or 14, characterized in that: The shading plate is bonded to a metal material or a material suitable for the exterior surface.

17. The optical lens according to claim 12 or 15, characterized in that: The light shielding plate is made of the same material as the integrated lens barrel, and the adhesive material for bonding the light shielding plate is made of the same material as the first adhesive material.

18. The optical lens according to claim 7, characterized in that: The second segment has a plurality of steps, and the plurality of steps are suitable for sequentially embedding a plurality of second lenses to assemble the second lens group.

19. The optical lens according to claim 7, characterized in that: The cylindrical body and the inner extension portion are integrally formed.

20. A camera module, characterized in that: An optical lens comprising any one of claims 7 to 19.

21. An optical lens assembly method, characterized in that: include: Preparing an integrated lens barrel, the integrated lens barrel comprising a cylindrical body having an inner side and a central axis; and an inner extension portion, the inner extension portion extending inward from the inner side surface and having a light-through hole in the center, the inner extension portion dividing the inner side surface into a first segment and a second segment, wherein the top surface of the inner extension portion and the first segment form a first groove, and the bottom surface of the inner extension portion and the second segment form a second groove; Mounting a second lens group on the integrated lens barrel to form a second lens component, wherein the second lens group includes at least one second lens, and the second lens group is supported by the bottom surface of the inner extension portion and is placed in the second groove; preparing a first lens group, wherein the first lens group includes a single first lens or a plurality of first lenses assembled together by relying on the interaction of the lenses themselves; Placing the first lens group in the first groove, and then pre-positioning the first lens group and the second lens component so that the first lens group and the second lens group form an imageable optical system; Actively calibrating the relative positions of the first lens group and the second lens group based on the measured imaging results; as well as The first lens group is bonded to the first groove by a first adhesive material, and the first lens group and the second lens group are kept at a relative position determined by active calibration, thereby obtaining the optical lens. The first lens group includes an optical zone and a structural zone surrounding the optical zone, and the top surface of the structural zone is set to be higher than the top surface of the integrated lens barrel.

22. The optical lens assembly method according to claim 21, characterized in that: The first segment is in a closed ring shape when viewed from above; In the pre-positioning step and the active calibration step, the first lens group is clamped by a fixture for movement, wherein a gap for accommodating the fixture is provided between the first segment and the side surface of the first lens group.

23. The optical lens assembly method according to claim 21, characterized in that: The first segment is in a ring shape with a gap when viewed from a top view; In the pre-positioning step and the active calibration step, the first lens group is clamped and moved by a clamp, wherein the clamp extends into the integrated lens barrel through the notch and clamps the first lens group.

24. The optical lens assembly method according to claim 21, characterized in that: The second segment has a plurality of steps; In the step of installing the second lens group on the integrated lens barrel, the at least one second lens is sequentially embedded into the multiple steps to assemble the second lens group and constitute the second lens component.

25. The optical lens assembly method according to claim 21, characterized in that: In the step of bonding the first lens group and the first groove by means of a first adhesive material, the first adhesive material is arranged only between the bottom surface of the first lens group and the top surface of the inner extension portion; or the first adhesive material is arranged both between the bottom surface of the first lens group and the top surface of the inner extension portion and between the side surface of the first lens group and the first segment.

26. The optical lens assembly method according to claim 21, characterized in that: The first lens group includes an optical zone and a structural zone surrounding the optical zone; The assembly method further comprises: A light shielding plate is adhered to the top surface of the structural area, and no adhesive material is filled between the light shielding plate and the top surface of the cylindrical body.

27. The optical lens assembly method according to claim 21, characterized in that: The assembly method further comprises: A light shielding plate is adhered to the top surface of the cylindrical body, and no adhesive material is filled between the light shielding plate and the top surface of the first lens group.

28. The optical lens assembly method according to claim 26 or 27, characterized in that: After the step of bonding the first lens group and the first groove by means of the first adhesive is completed, the step of adhering the light shielding plate is performed.

29. The optical lens assembly method according to claim 26 or 27, characterized in that: The step of bonding the first lens group and the first groove by means of the first adhesive material comprises the steps of applying adhesive, exposing and baking performed in sequence; The step of attaching the light shielding plate is performed after the exposure step and before the baking step.

30. A camera module assembly method, characterized in that: include: Assembling an optical lens using the optical lens assembly method described in any one of claims 21 to 28; as well as A camera module is assembled based on the optical lens.

Images