Optical lens, camera module and assembly method thereof

Abstract

The present application provides an optical lens, comprising: a field curvature lens component including a field curvature lens group; a first lens component including a first lens group; and a second lens component including a second lens group, wherein the first lens group, the second lens group and the field curvature lens group together form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; and there is a first gap between the field curvature lens component and the second lens component, and the field curvature of the optical system is compensated by adjusting the first gap. The present application also provides a corresponding camera module, as well as a method for assembling the optical lens and the camera module.

Description

Technical Field

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

[0002] With the development of terminals such as mobile phones and computers, users' demands have been significantly improved. 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 and wide-angle lenses, and lenses with a large number of lenses to solve aberration. On the one hand, this makes the optical design more and more complex. On the other hand, the reality is that complex optical systems are very sensitive, which poses a great challenge to the manufacturing yield and product quality. For example, the compact development of mobile phones and the increase in the screen-to-body ratio of mobile phones have made the space available for the front camera module inside the mobile phone smaller and smaller, while the market has put forward higher and higher requirements for the imaging quality of the camera module.

[0003] In the field of compact camera modules (such as camera modules for mobile phones), it is often necessary to consider the quality of the optical imaging lens and the manufacturing errors during the module packaging process. Specifically, during the manufacturing process of the optical imaging lens, the factors affecting the lens resolution come from the errors of each component and its assembly, the errors of the lens spacer element thickness, the assembly fit errors of each lens, and the change in the refractive index of the lens material, etc. Because there are many factors affecting the lens resolution and they exist in multiple components, and the control of each factor has a limit of manufacturing precision. If only the precision of each component is simply improved, the improvement ability is limited, the improvement cost is high, and it cannot meet the increasingly high imaging quality requirements of the market.

[0004] The applicant has proposed an assembly method for manufacturing a complete optical lens or camera module by actively calibrating the process to adjust and determine the relative positions of the upper and lower sub-lenses, 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 the optical lens or camera module in mass production and improve the imaging quality.

[0005] Further, during the active calibration process, the imaging quality evaluation of the camera module is involved. The performance evaluation indexes of the camera module include the peak resolution and the field curvature at each field position. Among them, the peak resolution characterizes the imaging clarity of the selected field of view, and the field curvature, also known as the image surface field curvature, characterizes the consistency between the imaging clear positions of each field of view and the imaging clear position of the central field of view. In one example, the field curvature can be defined as the deviation between the center point of the plane fitted by the imaging clear point positions of the selected field of view and the ideal center position (it should be noted that this is not the only definition method of the field curvature. For example, sometimes the field curvature can also be defined as the degree of tortuosity of the image surface fitted by the imaging clear point positions of the selected field of view). When the peak resolution is qualified but the field curvature is poor, the entire field of view area cannot be clearly imaged simultaneously; when the field curvature is qualified and the peak resolution is poor, the clarity of the entire field of view area is uniform but not clear enough. People expect both the field curvature and the peak resolution to be within the qualified range to obtain a product with better imaging quality.

[0006] Existing lens products based on active calibration can correct the field curvature during the active correction process. However, in the existing solutions, only the upper group is adjustable relative to the lower group. Since the displacement / rotation of the upper group of lenses is less sensitive to the field curvature, a large displacement / rotation is required to adjust to a better field curvature position, which will sacrifice more resolution performance. Furthermore, a longer adjustment time is required or a qualified product cannot be obtained, affecting production efficiency and yield.

[0007] On the other hand, there is also a technology in the prior art for actively calibrating the gap between the lens and the photosensitive component. This active correction cannot adjust the field curvature. In other words, the field curvature of the lens is fixed during assembly. Once a defective product with poor field curvature is assembled, the subsequent processes cannot correct its defect, and the lens incoming material is scrapped. In addition, the photosensitive component contains a photosensitive chip, and this photosensitive chip is installed on the circuit board. During assembly, baking thermal stress or other mechanical stresses will also cause the photosensitive chip to bend and generate field curvature. That is to say, when the field curvature of the lens incoming material is within the qualified range, it may be assembled with a semi-finished chip (i.e., the photosensitive component) with a certain field curvature, resulting in the possibility of assembling defective products from qualified lens incoming materials. Summary of the Invention

[0008] The present invention aims to provide a solution that can overcome at least one defect of the prior art.

[0009] According to one aspect of the present invention, an optical lens is provided, comprising: a field curvature lens component, which includes a field curvature lens group, and the field curvature lens group includes at least one lens; a first lens component, which includes a first lens group, and the first lens group includes at least one lens; and a second lens component, which includes a second lens group, and the second lens group includes at least one lens. The first lens group, the second lens group, and the field curvature lens group together form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; and there is a first gap between the field curvature lens component and the second lens component, and the field curvature of the optical system is compensated by adjusting the first gap.

[0010] Wherein, the first lens component and the second lens component are bonded together by a second adhesive material, and the field curvature lens component and the second lens component are bonded together by a first adhesive material. After curing, the second adhesive material supports and fixes the first lens component and the second lens component, so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by active calibration; and, after curing, the first adhesive material supports and fixes the field curvature lens component and the second lens component, so that the relative position between the field curvature lens component and the second lens component is maintained at the relative position determined by active calibration, wherein the active calibration is to adjust the relative position between the first lens component and the second lens component, and the relative position between the second lens component and the field curvature lens component based on the actual imaging result of the optical system.

[0011] Wherein, among multiple optical lenses under the same optical design, there are at least a first optical lens and a second optical lens, and the size of the first gap of the first optical lens in the optical axis direction of the optical lens is different from the size of the first gap of the second optical lens in the optical axis direction of the optical lens.

[0012] Wherein, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the second lens group is mounted on the motor carrier; the first adhesive material is located between the motor housing and the field curvature lens component.

[0013] Wherein, the field curvature lens group has only one lens.

[0014] According to another aspect of the present application, there is also provided an imaging module, comprising: at least one imaging lens component, wherein each of the imaging lens components includes an imaging lens group, and the imaging lens group includes at least one lens; and a field curvature component, which includes a photosensitive component and a field curvature lens group fixed to the photosensitive component, and the field curvature lens group includes at least one lens, and all the imaging lens groups and the field curvature lens group together form an imaging optical system; wherein, there is a first gap between the field curvature component and the imaging lens component, and the field curvature of the optical system is compensated by adjusting the first gap.

[0015] Wherein, the at least one imaging lens component includes: a first lens component, which includes a first lens group, and the first lens group includes at least one lens; and a second lens component, which includes a second lens group, and the second lens group includes at least one lens, the first lens group, the second lens group and the field curvature lens group together form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; wherein, the field curvature component and the imaging lens component are bonded by a first adhesive material disposed in the first gap, and the first adhesive material supports and fixes the field curvature component and the imaging lens component after curing, so that the relative position between the field curvature component and the imaging lens component is maintained at the relative position determined by active calibration; the first lens component and the second lens component are bonded together by a second adhesive material, and the second adhesive material supports and fixes the first lens component and the second lens component after curing, so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by active calibration.

[0016] Wherein, among multiple imaging modules under the same optical design, there are at least a first imaging module and a second imaging module, and the size of the first gap of the first imaging module in the optical axis direction of the imaging module is different from the size of the first gap of the second imaging module in the optical axis direction of the imaging module.

[0017] Wherein, the field curvature lens group has only one lens, the first lens group is located at the front end of the second lens group, and the second lens group is located between the first lens group and the field curvature lens group.

[0018] Wherein, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the second lens group is mounted on the motor carrier; the first adhesive material is located between the motor housing and the field curvature component; and the first lens group includes at least one variable-focus liquid lens.

[0019] Among them, the number of the imaging lens components is one. The imaging lens component further includes a motor. The motor includes a motor housing and a motor carrier. The motor carrier is movably connected to the motor housing. The imaging lens component is mounted on the motor carrier.

[0020] Among them, the photosensitive component includes a photosensitive chip. The actual imaging result is obtained based on the image data output by the photosensitive chip.

[0021] Among them, the photosensitive component further includes: a circuit board, on the surface of which the photosensitive chip is mounted; a lens holder, which is mounted or formed on the surface of the circuit board and surrounds the photosensitive chip; and a color filter, which is mounted on the lens holder. The field curvature lens group abuts against the top surface of the lens holder and / or the top surface of the color filter.

[0022] Among them, the field curvature component and the imaging lens component are bonded by a first adhesive material disposed in the first gap. The first adhesive material is located between the lens holder and the motor housing. The field curvature lens group and the motor carrier are separated from each other.

[0023] Among them, the field curvature lens group includes a microlens array.

[0024] According to another aspect of the present application, an optical lens assembly method is further provided, including: preparing a field curvature lens component and at least one imaging lens component, wherein the field curvature lens component and the at least one imaging lens component are separated from each other. Each imaging lens component includes an imaging lens group, and each imaging lens group includes at least one lens. The field curvature lens component includes a field curvature lens group, and the field curvature lens group includes at least one lens; pre-positioning the at least one imaging lens component and the field curvature lens component so that the at least one imaging lens group and the field curvature lens group jointly form an imaging optical system; actively calibrating the at least one imaging lens component and the field curvature lens component. The active calibration is to adjust the relative positions of the at least one imaging lens component and the field curvature lens component based on the actual imaging result of the optical system; wherein the field curvature of the optical system is compensated by adjusting the first gap between the imaging lens component and the field curvature lens component; and connecting the at least one imaging lens component and the field curvature lens component so that the relative positions of the at least one imaging lens component and the field curvature lens component are maintained at the relative positions determined by the active calibration.

[0025] Among them, in the preparation step, the at least one imaging lens component includes a first lens component and a second lens component, wherein the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens; in the pre-positioning step, the first lens component, the second lens component and the field curvature lens component are pre-positioned so that the first lens group, the second lens group and the field curvature lens group together form an imaging optical system; in the active calibration step, the active calibration is to adjust the relative positions of the first lens component, the second lens component and the field curvature lens component based on the actual imaging result of the optical system; and in the connection step, the first lens component is bonded to the second lens component so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by the active calibration, and the second lens component is bonded to the field curvature lens component so that the relative position between the second lens component and the field curvature lens component is maintained at the relative position determined by the active calibration.

[0026] Among them, in the preparation step, the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; and in the active calibration step, the imaging clarity of the optical system is made to meet the standard by adjusting the position of the first lens component, and the field curvature of the optical system is made to meet the standard by adjusting the position of the field curvature lens component.

[0027] Among them, in the active calibration step, the field curvature of the optical system is compensated by adjusting the distance between the field curvature lens component and the second lens component in the optical axis direction of the optical lens so that the field curvature of the optical system meets the standard.

[0028] Among them, in the preparation step, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens; and in the connection step, the bonding of the second lens component to the field curvature lens component is achieved by bonding the motor housing to the field curvature lens component.

[0029] According to another aspect of the present application, a method for assembling a camera module is further provided, which includes: preparing a field curvature component and at least one imaging lens component, wherein the field curvature component and the imaging lens component are separated from each other, each imaging lens component includes an imaging lens group, each imaging lens group includes at least one lens, the field curvature component includes a photosensitive component and a field curvature lens group fixed to the photosensitive component, and the field curvature lens group includes at least one lens; pre-positioning the at least one imaging lens component and the field curvature component so that the imaging lens group and the field curvature lens group together form an imaging optical system; actively calibrating the at least one imaging lens component and the field curvature component, and the active calibration is to adjust the relative positions of the at least one imaging lens component and the field curvature component based on the actual imaging result of the optical system; wherein the field curvature of the optical system is compensated by adjusting the first gap between the imaging lens component and the field curvature component; and connecting the at least one imaging lens component and the field curvature component so that the relative positions of the at least one imaging lens component and the field curvature component are maintained at the relative positions determined by the active calibration.

[0030] Wherein, in the preparation step, the at least one imaging lens component includes a first lens component and a second lens component, wherein the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens; in the pre-positioning step, pre-positioning the first lens component, the second lens component and the field curvature component so that the first lens group, the second lens group and the field curvature lens group together form an imaging optical system; in the active calibration step, the active calibration is to adjust the relative positions of the first lens component, the second lens component and the field curvature component based on the actual imaging result of the optical system; and in the connecting step, bonding 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, and bonding the second lens component and the field curvature component so that the relative positions of the second lens component and the field curvature component are maintained at the relative positions determined by the active calibration.

[0031] Wherein, in the preparation step, the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; and in the active calibration step, the position of the first lens component is adjusted to make the imaging clarity of the optical system meet the standard, and the position of the field curvature component is adjusted to make the field curvature of the optical system meet the standard.

[0032] In the active calibration step, the field curvature of the optical system is compensated by adjusting the distance between the field curvature component and the second lens component in the optical axis direction of the camera module, so that the field curvature of the optical system meets the standard.

[0033] In the preparation step, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens; and in the connection step, the adhesion between the second lens component and the field curvature component is achieved by adhering the motor housing to the field curvature component.

[0034] In the preparation step, the field curvature component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; the preparation step further includes: fixing the motor housing to the photosensitive component and / or the field curvature lens group, and keeping the field curvature lens group and the motor carrier separated from each other; and in the connection step, the adhesion between the second lens component and the field curvature component is achieved by adhering the second lens component to the motor carrier.

[0035] In the preparation step, the field curvature component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; the preparation step further includes: fixing the motor housing to the photosensitive component and / or the field curvature lens group, and keeping the field curvature lens group and the motor carrier separated from each other; and in the connection step, the adhesion between the imaging lens component and the field curvature component is achieved by adhering the imaging lens component to the motor carrier.

[0036] In the preparation step, the field curvature lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; and in the connection step, the adhesion between the second lens component and the field curvature lens component is achieved by adhering the second lens component to the motor carrier.

[0037] According to another aspect of the present application, a method for assembling a camera module is further provided, which includes: assembling an optical lens according to any one of the foregoing optical lens assembling methods; and mounting the optical lens on a photosensitive component to obtain a camera module.

[0038] Compared with the prior art, the present invention has at least the following technical effects:

[0039] 1. The present invention can correct the field curvature of defective incoming materials during the assembly process of a camera module or an optical lens, thereby relaxing the acceptance range of incoming materials.

[0040] 2. The present invention can compensate for the field curvature caused by chip bending (for example, baking thermal stress or other mechanical stresses can also cause the photosensitive chip to bend) during the assembly process of the camera module, thereby improving the yield rate.

[0041] 3. While compensating for the field curvature, the present invention can ensure that the peak resolution does not deteriorate too much, thereby improving the overall imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Exemplary embodiments are shown in the accompanying drawings. The embodiments and drawings disclosed herein should be regarded as illustrative rather than restrictive.

[0043] Figure 1 The assembly schematic diagram of a camera module according to an embodiment of the present invention is shown;

[0044] Figure 2 The assembly schematic diagram of a camera module according to another embodiment of the present invention is shown;

[0045] Figure 3 The assembly schematic diagram of a camera module according to yet another embodiment of the present invention is shown;

[0046] Figure 4 The assembly schematic diagram of a camera module according to still another embodiment of the present invention is shown;

[0047] Figure 5 The assembly schematic diagram of a camera module according to still another embodiment of the present invention is shown;

[0048] Figure 6 The optical lens assembly schematic diagram when the field curvature lens component consists of a single lens in an embodiment of the present application is shown;

[0049] Figure 7 The optical lens assembly schematic diagram when the field curvature lens component includes a lens barrel in another embodiment of the present application is shown;

[0050] Figure 8 The assembly schematic diagram of a camera module when the field curvature lens component consists of a single lens in an embodiment of the present application is shown;

[0051] Figure 9 The assembly schematic diagram of a camera module when the field curvature lens component includes a lens barrel in another embodiment of the present application is shown;

[0052] Figure 10A The relative position adjustment method in active calibration in an embodiment of the present invention is shown;

[0053] Figure 10B Shows the rotational adjustment in active calibration of another embodiment of the present invention;

[0054] Figure 10C Shows the relative position adjustment method with added v and w direction adjustments in active calibration of yet another embodiment of the present invention. Detailed implementation manners

[0055] To better understand the present application, more detailed descriptions of various aspects of the present application will be made 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 do not 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.

[0056] It should be noted that in this specification, the expressions such as 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 teachings of the present application, the first subject discussed below may also be referred to as the second subject.

[0057] In the drawings, for ease of illustration, the thickness, dimensions and shape of the objects have been slightly exaggerated. The drawings are only examples and are not drawn to an exact scale.

[0058] It should also be understood that the terms "comprise", "comprising", "have", "including" and / or "including having", when used in this specification, indicate the presence of the stated features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of..." appears after the list of listed features, it modifies the entire list of listed features rather than an individual element in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0059] As used herein, the terms "substantially", "about" and similar terms are used as terms indicating approximation and not as terms indicating degree, and are intended to account for the inherent deviations in measured or calculated values that would be recognized by a person of ordinary skill in the art.

[0060] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0061] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0062] Figure 1 The assembly schematic diagram of the camera module according to an embodiment of the present invention is shown. As Figure 1 shown, the camera module of this embodiment includes: an imaging lens component 10, a field curvature component 20, and a first adhesive ( Figure 1The imaging lens component 10 and the field curvature component 20 are respectively shown, but the first adhesive material is not shown. Among them, the imaging lens component 10 includes an imaging lens group 11, and the imaging lens group 11 includes at least one lens (the imaging lens group 11 can be a single lens or composed of multiple lenses). The field curvature component 20 includes a photosensitive component 21 and a field curvature lens group 22 fixed to the photosensitive component. The field curvature lens group 22 includes at least one lens (the field curvature lens group can be a single lens sensitive to field curvature or composed of multiple lenses sensitive to field curvature). The imaging lens group 11 and the field curvature lens group 22 jointly form an imaging optical system, and the field curvature sensitivity of the field curvature lens group can be higher than that of the imaging lens group (it should be noted that in other embodiments of the present application, the field curvature sensitivity of the field curvature lens group can also be not higher than that of the imaging lens group, which will be further described in combination with other embodiments below). The first adhesive material is arranged in the gap between the field curvature component and the imaging lens component, and after curing, the first adhesive material supports and fixes the field curvature component and the imaging lens component, so that the relative position between the field curvature component and the imaging lens component is maintained at the relative position determined by active calibration, where the active calibration is to adjust the relative position of the imaging lens component and the field curvature component based on the actual imaging result of the optical system. The field curvature sensitivity of a lens or a lens group (sometimes also referred to as field curvature sensitivity) can be judged by simulating and analyzing the influence degree of the manufacturing tolerance and assembly tolerance of each lens on the field curvature (usually the field curvature under a selected field of view). Sometimes, the sensitivity analysis table will be directly provided for the lenses purchased on the market, and the field curvature sensitivity information of each lens or (lens group) can be directly obtained according to this sensitivity analysis table. According to this field curvature sensitivity information, it can be determined which lens or lenses in the designed optical system constitute the field curvature lens group, and which lens or lenses form the imaging lens group. The camera module provided in this embodiment can correct the field curvature of defective incoming materials during the assembly process, thereby relaxing the acceptance range of incoming materials. In addition, the field curvature caused by the chip bending (for example, baking thermal stress or other mechanical stresses can also cause the photosensitive chip to bend) can be compensated, thereby improving the yield.

[0063] Note that in some other embodiments of the present application, the field curvature lens group may not be the lens group with the highest field curvature sensitivity in the imaging module. For example, in one embodiment, the field curvature lens group may be a lens located at the bottom (i.e., the rearmost end) in the optical design. During the active calibration phase, by adjusting the distance between this lens and the imaging lens component in the optical axis direction (referring to the optical axis of the imaging module), the field curvature of the optical system can be adjusted, thereby compensating for the field curvature. Among them, only by moving the field curvature lens group in the optical axis direction can the adjustment of the field curvature of the optical system be achieved, while not affecting other imaging quality indicators of the optical system (such as the imaging clarity of the selected field of view). When the field curvature lens group is composed of a single lens, it may not be necessary to configure a separate lens barrel for the field curvature component, but directly fix the field curvature lens to the photosensitive component. Further, in one embodiment, the field curvature lens group may be composed of only a single field curvature lens, and this field curvature lens can be supported on the photosensitive component (for example, it can be supported on the color filter of the photosensitive component). When the field curvature of the incoming lens fails to meet the standard, the above-mentioned field curvature component (the field curvature component formed by directly fixing the field curvature lens to the photosensitive component) can be used to compensate for the field curvature, so as to obtain an imaging module product with qualified imaging quality.

[0064] In one embodiment, the first adhesive material is disposed in a first gap between the second lens component and the field curvature component. In the optical design, the designed size of the first gap in the optical axis direction of the optical lens is at least 50 micrometers. It should be noted that since active calibration adjusts the relative positions of components according to the actual imaging results, that is, adjusts the gap between components (such as the first gap) according to the actual imaging results, after the active calibration is completed, the size of the first gap may be different from the designed size. Further, in this embodiment, for products of the same batch under the same optical design, at least two optical lenses (or two camera modules) can be found, and the sizes of the first gaps of these two optical lenses (or two camera modules) in the optical axis direction of the optical lens are different. In other words, for products of the same batch under the same optical design, at least two optical lenses (or two camera modules) can be found, and the thicknesses of the first adhesive materials of these two optical lenses (or two camera modules) (referring to the thickness in the optical axis direction) are different. Conversely, when the thicknesses of the first adhesive materials (referring to the thickness in the optical axis direction) of multiple optical lenses (or multiple camera modules) in the same batch of products under the same optical design are different, it can be regarded that this batch of products are assembled products after active calibration of the first gap. In the assembled products after active calibration of the first gap, the first adhesive material is disposed in the first gap between the field curvature component and the imaging lens component (or the second lens component described below), and after the first adhesive material is cured, it supports and fixes the field curvature component and the imaging lens component (or the second lens component described below), so that the relative positions between the field curvature component and the imaging lens component (or the second lens component described below) are maintained at the relative positions determined by the active calibration. Further, still referring to Figure 1 , in one embodiment of the present invention, the imaging lens component further includes a motor 12. The motor 12 includes a motor housing 12a and a motor carrier (it should be noted that Figure 1 the motor carrier is not shown in the figure), and the motor carrier is movably connected to the motor housing, for example, the motor carrier is movably connected to the motor housing through a shrapnel (which can also be called a reed). The motor carrier can be in a cylindrical shape, and the imaging lens component is mounted on the motor carrier. The camera module of this embodiment can further implement functions based on the motor such as autofocus or optical image stabilization.

[0065] Further, still referring to Figure 1, in an embodiment of the present invention, the photosensitive component 21 includes a photosensitive chip 21a, a circuit board 21b, a lens holder 21c, and a color filter 21d. Among them, the actual imaging result required for active calibration is obtained based on the image data output by the photosensitive chip 21a. The photosensitive chip 21a is mounted on the surface of the circuit board 21b. The lens holder 21c is mounted or formed on the surface of the circuit board 21b and surrounds the photosensitive chip 21a. The color filter 21d is mounted on the lens holder 21c. The field curvature lens group 22 abuts against the top surface of the lens holder 21c and / or the top surface of the color filter 21d. Active calibration is performed between the imaging lens component and the field curvature component with the photosensitive component. The first adhesive material may be located between the lens holder 21c and the motor housing 12a, and the field curvature lens group 22 and the motor carrier are separated from each other. Here, being separated from each other means that the field curvature lens group and the motor carrier do not directly contact each other and are not bonded to each other through the adhesive material.

[0066] Figure 2 The assembly schematic diagram of the camera module according to another embodiment of the present invention is shown. In this embodiment, the number of imaging lens components 10 is one, and the imaging lens component 10 does not include a motor. The field curvature component 20 includes a motor 12. Specifically, the motor 12 includes a motor housing 12a and a motor carrier. The motor carrier may be cylindrical, and the motor carrier is movably connected to the motor housing 12a, for example, through a leaf spring 12b (which can also be called a reed. In one example, to improve stability, an upper leaf spring and a lower leaf spring may be provided. It should be noted that Figure 2 only the upper leaf spring is shown as 12b in the figure) to movably connect the motor carrier to the motor housing 12a. Active calibration is performed between the imaging lens component and the field curvature component with the motor and the photosensitive component. The first adhesive material is located between the motor carrier and the imaging lens component 10. In one example, the imaging lens component 10 may have a lens barrel, and a plurality of lenses are assembled together through the lens barrel to form the imaging lens component 10. At this time, the first adhesive material is located between the inner side surface of the motor carrier and the outer side surface of the lens barrel.

[0067] Figure 3The assembly schematic diagram of an imaging module according to another embodiment of the present invention is shown. In this embodiment, the imaging module includes two imaging lens components, a field curvature component 20, a first adhesive and a second adhesive. The two imaging lens components are a first lens component 10a and a second lens component 10b respectively. The first lens component 10a includes a first lens group, and the first lens group includes at least one lens. The second lens component 10b includes a second lens group, and the second lens group includes at least one lens. The first lens group, the second lens group and the field curvature lens group 22 together form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group 22. The first adhesive is disposed in the gap between the field curvature component 20 and the imaging lens component (in this embodiment, the first adhesive is disposed in the gap between the field curvature component 20 and the second lens component 10b), and after curing, the first adhesive supports and fixes the field curvature component and the imaging lens component, so that the relative position between the field curvature component and the imaging lens component is maintained at the relative position determined by active calibration, where the active calibration is to adjust the relative position of the imaging lens component and the field curvature component based on the actual imaging result of the optical system. The first lens component 10a and the second lens component 10b are bonded together by a second adhesive, and after curing, the second adhesive supports and fixes the first lens component and the second lens component, so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by active calibration. The sensitivity of a lens or a lens group to imaging clarity (sometimes the sensitivity is also referred to as sensitivity) can be judged by simulating and analyzing the influence degree of the manufacturing tolerance and assembly tolerance of each lens on imaging clarity (usually the imaging clarity under a selected field of view). Sometimes, the lenses purchased on the market will directly provide a sensitivity analysis table, and the sensitivity information of each lens or (lens group) to imaging clarity can be directly obtained according to this sensitivity analysis table. According to this information, it can be determined which lens or lenses in the designed optical system have a higher sensitivity to imaging clarity and which lens or lenses have a lower sensitivity to imaging clarity. In some embodiments, imaging clarity can be characterized by the peak resolution (for example, the peak of the MTF curve). In this embodiment, during the assembly process of the imaging module, the field curvature of incoming defective products can be corrected, thereby relaxing the acceptance range of incoming materials. In addition, the field curvature caused by chip bending (for example, baking thermal stress or other mechanical stresses can also cause the photosensitive chip to bend) can be compensated, thereby improving the yield. Furthermore, while compensating for the field curvature, the peak resolution can be ensured not to deteriorate too much, thereby improving the overall imaging quality.

[0068] Further, still referring to Figure 3, in an embodiment of the present invention, the second lens component further includes a motor 12, and the motor 12 includes a motor housing 12a and a motor carrier. The motor carrier is movably connected to the motor housing 12a. For example, the motor carrier is movably connected to the motor housing through a shrapnel 12b (which can also be called a reed). The second lens group is mounted on the motor carrier. The first adhesive material is located between the motor housing 12a and the field curvature component 20. The imaging module of this embodiment can further implement functions based on the motor such as autofocus or optical image stabilization.

[0069] Furthermore, still referring to Figure 3 , in an embodiment of the present invention, the first lens group includes at least one variable-focus liquid lens, thereby constituting a zoom imaging module. Among them, the liquid level shape of the liquid lens in the first lens component 10a can be changed electrically, and the second lens group is driven by a motor to move in the second lens component 10b to achieve zooming and keep the image plane on the plane of the photosensitive chip. In this way, the zoom imaging module of this embodiment can achieve stepless zoom.

[0070] Furthermore, in an embodiment, the field curvature lens group 22 may include a microlens array, and the microlens array can be fixed to the photosensitive component and implement a refocusing function by carrying a corresponding algorithm.

[0071] Furthermore, still referring to Figure 3 , in an embodiment of the present invention, the first lens group is located at the front end of the second lens group, and the second lens group is located between the first lens group and the field curvature lens group. Among them, the front end refers to the end of the imaging module or the optical lens close to the object side.

[0072] The optical devices described in the foregoing embodiments are all imaging modules. According to some other embodiments of the present invention, corresponding optical lenses are also provided.

[0073] In one embodiment, the optical lens includes an imaging lens component and a field curvature lens component. Among them, the imaging lens component includes an imaging lens group, and the imaging lens group includes at least one lens. The field curvature lens component includes a field curvature lens group, and the field curvature lens group includes at least one lens. The imaging lens group and the field curvature lens group together form an imaging optical system. In this embodiment, the field curvature sensitivity of the field curvature lens group can be higher than that of the imaging lens group (it should be noted that in other embodiments, the field curvature sensitivity of the field curvature lens group may not be higher than that of the imaging lens group). The optical lens further includes a first adhesive material, which is disposed in the gap between the field curvature lens component and the imaging lens component, and the first adhesive material supports and fixes the field curvature lens component and the imaging lens component after curing, so that the relative position between the field curvature lens component and the imaging lens component is maintained at the relative position determined by active calibration, where the active calibration is to adjust the relative position of the at least one imaging lens component and the field curvature lens component based on the actual imaging result of the optical system. The field curvature sensitivity (sometimes also referred to as field curvature sensitivity) of a lens or a lens group can be judged by simulating and analyzing the influence degree of the manufacturing tolerance and assembly tolerance of each lens on the field curvature (usually the field curvature at a selected field of view). Sometimes, the sensitivity analysis table will be directly provided for the lenses purchased on the market, and the field curvature sensitivity information of each lens or (lens group) can be directly obtained according to this sensitivity analysis table. According to this field curvature sensitivity information, it can be determined which lens or lenses in the designed optical system constitute the field curvature lens group, and which lens or lenses form the imaging lens group.

[0074] It should be noted that in some other embodiments of the present application, the field curvature lens group may not be the lens group with the highest field curvature sensitivity in the optical lens. For example, in one embodiment, the field curvature lens group may be a lens located at the bottom (i.e., the last end) in the optical design. During the active calibration stage, by adjusting the distance between this lens and the imaging lens component in the optical axis (referring to the optical axis of the optical lens) direction, the field curvature of the optical system can be adjusted, so as to compensate for the field curvature of the optical system. Among them, only by moving the field curvature lens group in the optical axis direction, the adjustment of the field curvature of the optical system can be achieved, while not affecting other imaging quality indicators of the optical system (such as the imaging clarity of the selected field of view).

[0075] Further, in one embodiment, in the optical lens, the number of the imaging lens components is two, namely a first lens component and a second lens component. The first lens component includes a first lens group, and the first lens group includes at least one lens. The second lens component includes a second lens group, and the second lens group includes at least one lens. The first lens group, the second lens group, and the field curvature lens group together constitute an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group. The first lens component and the second lens component are bonded together by a second adhesive material. After curing, the second adhesive material supports and fixes the first lens component and the second lens component, so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by active calibration. The sensitivity of a lens or a lens group to imaging clarity (sometimes the sensitivity is also referred to as sensitivity) can be judged by simulating and analyzing the influence degree of the manufacturing tolerance and assembly tolerance of each lens on imaging clarity (usually the imaging clarity under a selected field of view). Sometimes, the sensitivity analysis table will be directly provided for the lenses purchased in the market. According to this sensitivity analysis table, the sensitivity information of each lens or (lens group) to imaging clarity can be directly obtained. According to this information, in the designed optical system, it can be determined which lens or lenses have a higher sensitivity to imaging clarity and which lens or lenses have a lower sensitivity to imaging clarity. In some embodiments, imaging clarity can be characterized by the peak resolution (the peak of the MTF curve). Further, in one embodiment, the field curvature lens component can be composed of a single lens. Figure 6 FIG. shows a schematic assembly diagram of an optical lens when the field curvature lens component is composed of a single lens in an embodiment of the present application. In this embodiment, the optical lens is assembled by active calibration from a first lens component 10a, a second lens component 10b, and a field curvature lens component 20a, where the field curvature lens component 20a can be composed of a single lens (this lens can be a bare lens without a lens barrel). Figure 7 FIG. shows a schematic assembly diagram of an optical lens when the field curvature lens component includes a lens barrel in another embodiment of the present application. In this embodiment, the field curvature lens component 20a can include a lens barrel and one or more lenses installed in the lens barrel.

[0076] Figure 8 FIG. shows a schematic assembly diagram of an imaging module when the field curvature lens component is composed of a single lens in an embodiment of the present application. Refer to Figure 8 , Figure 6 In the optical lens 100 of the embodiment (referring to the assembled optical lens 100), it can be installed in the motor carrier of the motor, and then the combination of the motor 12 and the optical lens 100 (which can be called the motor lens assembly) is installed on the photosensitive component 200, so as to obtain a focus-variable imaging module (such as an auto-focus imaging module). Figure 9Shows an assembly schematic diagram of an imaging module when the field curvature lens component in another embodiment of the present application includes a lens barrel. Refer to Figure 9 , Figure 7 The optical lens 100 (referring to the assembled optical lens 100) of the embodiment can be installed in the motor carrier of the motor, and then the combination of the motor 12 and the optical lens 100 (which can be called the motor lens assembly) can be installed on the photosensitive component 200 to obtain a focusing imaging module (such as an autofocus imaging module).

[0077] Further, in one embodiment, in the optical lens, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the second lens group is installed on the motor carrier. The first adhesive material is located between the motor housing and the field curvature lens component.

[0078] Further, in one embodiment, in the optical lens, the first lens group includes at least one variable-focus liquid lens. In this embodiment, both the first lens component and the second lens component can be zoomed, thus constituting a zoom optical lens. Among them, in the first lens component, the liquid surface shape of the liquid lens can be changed electrically to achieve zooming or focusing. In the second lens component, the second lens group is driven by a motor to move to achieve zooming or focusing.

[0079] According to a series of embodiments of the present invention, an imaging module assembly method is also provided.

[0080] Refer to Figure 1 , in an imaging lens group of one embodiment, the imaging module assembly method includes the following steps S10 to S40 executed in sequence.

[0081] Step S10, prepare a field curvature component and at least one imaging lens component, wherein the field curvature component and the imaging lens component are separated from each other, the imaging lens group includes at least one lens, and the field curvature component includes a photosensitive component and a field curvature lens group fixed to the photosensitive component.

[0082] Step S20, pre-position the at least one imaging lens component and the field curvature component so that the imaging lens group and the field curvature lens group jointly form an imaging optical system. Among them, pre-positioning may include: using methods such as laser height measurement to respectively obtain the position and attitude information of the imaging lens component and the field curvature component, and then adjusting them to a predetermined initial position. Here, the initial position refers to the initial position of active calibration. In other words, this step can be regarded as a rough adjustment of the positions of the imaging lens component and the field curvature component.

[0083] Step S30: Actively calibrate the at least one imaging lens component and the field curvature component. The active calibration is to adjust the relative positions of the at least one imaging lens component and the field curvature component based on the actual imaging result of the optical system. Among them, the field curvature of the optical system is compensated by adjusting the first gap between the imaging lens component and the field curvature lens component. This step can be regarded as a fine adjustment of the positions of the imaging lens component and the field curvature component.

[0084] Step S40: Bond the at least one imaging lens component and the field curvature component so that the relative positions of the at least one imaging lens component and the field curvature component are maintained at the relative positions determined by the active calibration. Bonding generally includes two sub-steps: applying glue and curing (i.e., curing the glue material). The step of applying glue can be performed before the active calibration or after the active calibration is completed.

[0085] After the bonding is completed, a camera module based on active calibration can be obtained. In this embodiment, the field curvature of defective incoming materials can be corrected during the assembly process of the camera module, thereby relaxing the acceptance range of the incoming materials. In addition, the field curvature caused by chip bending (for example, baking thermal stress or other mechanical stresses can also cause the photosensitive chip to bend) can be compensated, thereby improving the yield.

[0086] Further, referring to Figure 3 , in one embodiment, in the preparation step (i.e., step S10), the at least one imaging lens component includes a first lens component and a second lens component. Among them, the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens. In the pre-positioning step (i.e., step S20), pre-position the first lens component, the second lens component, and the field curvature component so that the first lens group, the second lens group, and the field curvature lens group together form an imaging optical system. In the active calibration step (i.e., step S30), the active calibration is to adjust the relative positions of the first lens component, the second lens component, and the field curvature component based on the actual imaging result of the optical system. In the bonding step (i.e., step S40), bond the first lens component and the second lens component so that the relative position of the first lens component and the second lens component is maintained at the relative position determined by the active calibration, and bond the second lens component and the field curvature component so that the relative position of the second lens component and the field curvature component is maintained at the relative position determined by the active calibration.

[0087] Further, still referring to Figure 3, in one embodiment, in the preparation step (i.e., step S10), the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group.

[0088] Further, still referring to Figure 3 , in one embodiment, in the active calibration step (i.e., step S30), the imaging clarity of the optical system is made to meet the standard by adjusting the position of the first lens component, and the field curvature of the optical system is made to meet the standard by adjusting the position of the field curvature component (in another embodiment, the imaging clarity of the optical system can be made to meet the standard by adjusting the position of the first lens component first, and then the field curvature of the optical system can be made to meet the standard by adjusting the position of the field curvature component). In this embodiment, the field curvature of defective incoming parts can be corrected during the assembly process of the camera module, thereby relaxing the acceptance range of incoming parts. In addition, the field curvature caused by chip bending (for example, baking thermal stress or other mechanical stresses can also cause the photosensitive chip to bend) can be compensated, thereby improving the yield. Moreover, while compensating for the field curvature, the peak resolving power can be ensured not to deteriorate too much, thereby improving the overall imaging quality. In addition, the assembly of the camera module only requires three components participating in active calibration to be prepared, making the process steps relatively simple and helping to improve the yield. Further, in one embodiment, in the active calibration step, the field curvature of the optical system can be compensated by adjusting the distance between the field curvature component and the second lens component in the optical axis direction of the optical lens so that the field curvature of the optical system meets the standard.

[0089] Further, still referring to Figure 3 , in one embodiment, in the preparation step (i.e., step S10), the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens. In the bonding step (i.e., step S40), the bonding of the second lens component and the field curvature component is achieved by bonding the motor housing and the field curvature component.

[0090] Further, Figure 4 shows an assembly schematic diagram of a camera module according to still another embodiment of the present invention. Referring to Figure 4, in one embodiment, in the preparation step (i.e., step 10), the field curvature component 20 further includes a motor 12, the motor 12 includes a motor housing 12a and a motor carrier, and the motor carrier is movably connected to the motor housing. In this case, the imaging lens components may not have motors (for example, the first lens component 10a and the second lens component 10b may not have motors). The preparation step (i.e., step 10) further includes: fixing the motor housing 12a to the photosensitive component 21 and / or the field curvature lens group 22, and keeping the field curvature lens group 22 separated from the motor carrier. In the bonding step (i.e., step 40), the bonding of the second lens component 10b to the field curvature component 20 is achieved by bonding the second lens component 10b to the motor carrier (for example, the motor carrier may be cylindrical, and the second lens component 10b is bonded to the inner side surface of the cylindrical motor carrier).

[0091] Further, Figure 5 shows an assembly schematic diagram of a camera module according to another embodiment of the present invention. Refer to Figure 5 , in one embodiment, in the preparation step (i.e., step 10), the field curvature component 20 further includes a motor 12, the motor 12 includes a motor housing 12a and a motor carrier, and the motor carrier is movably connected to the motor housing 12a. The field curvature lens group 22 may be fixed to the motor housing, and the field curvature lens group 22 is kept separated from the motor carrier. In this case, the imaging lens components (for example, the first lens component 10a and the second lens component 10b may not have motors) may not have motors. The preparation step (i.e., step 10) further includes: fixing the motor housing to the photosensitive component 21. In the bonding step (i.e., step 40), the bonding of the imaging lens component to the field curvature component is achieved by bonding the imaging lens component to the motor carrier. Figure 5 , the number of the imaging lens components is 2, and the two imaging lens components are the first lens component 10a and the second lens component 10b respectively. The bonding of the imaging lens component to the field curvature component can be achieved by bonding the second lens component 10b to the motor carrier, and the first lens component 10a can be bonded to the second lens component 10b. The bonding of the second lens component 10b to the motor carrier can determine the relative position based on active calibration, and the bonding of the first lens component 10a to the second lens component 10b can also determine the relative position based on active calibration.

[0092] Further, in some embodiments of the present invention, corresponding optical lens assembly methods are also provided.

[0093] The optical lens assembly includes the following steps S100 to S400 executed in sequence.

[0094] Step S100: Prepare a field curvature lens component and at least one imaging lens component, where the field curvature lens component and the imaging lens component are separated from each other. Each imaging lens component includes an imaging lens group, and the imaging lens group includes at least one lens. The field curvature lens component includes a field curvature lens group.

[0095] Step S200: Pre-position the at least one imaging lens component and the field curvature lens component so that the imaging lens group and the field curvature lens group together form an imaging optical system.

[0096] Step S300: Actively calibrate the at least one imaging lens component and the field curvature lens component. The active calibration is to adjust the relative positions of the at least one imaging lens component and the field curvature lens component based on the actual imaging result of the optical system. Among them, the field curvature of the optical system is compensated by adjusting the first gap between the imaging lens component and the field curvature lens component.

[0097] Step S400: Bond the at least one imaging lens component and the field curvature lens component so that the relative positions of the at least one imaging lens component and the field curvature lens component are maintained at the relative positions determined by the active calibration.

[0098] Further, in the preparation step (i.e., step S100), the at least one imaging lens component includes a first lens component and a second lens component. Among them, the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens. In the pre-positioning step (i.e., step S200), pre-position the first lens component, the second lens component, and the field curvature lens component so that the first lens group, the second lens group, and the field curvature lens group together form an imaging optical system. In the active calibration step (i.e., step S300), the active calibration is to adjust the relative positions of the first lens component, the second lens component, and the field curvature lens component based on the actual imaging result of the optical system. In the bonding step (i.e., step S400), bond the first lens component and the second lens component so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by the active calibration, and bond the second lens component and the field curvature lens component so that the relative position between the second lens component and the field curvature lens component is maintained at the relative position determined by the active calibration.

[0099] Further, in one embodiment, in the preparation step (i.e., step S100), the first lens group is more sensitive to imaging clarity than the field curvature lens group. In the active calibration step (i.e., step S300), first, the position of the first lens component is adjusted to make the imaging clarity of the optical system meet the standard, and then the position of the field curvature lens component is adjusted to make the field curvature of the optical system meet the standard. Further, in one embodiment, in the active calibration step, the field curvature of the optical system can be compensated by adjusting the distance between the field curvature lens component and the second lens component in the optical axis direction of the optical lens, so that the field curvature of the optical system meets the standard.

[0100] Further, in one embodiment, in the preparation step (i.e., step S100), the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens. In the bonding step (i.e., step S400), the bonding of the second lens component and the field curvature lens component is achieved by bonding the motor housing and the field curvature lens component.

[0101] Further, referring to Figure 5 , in one embodiment, in the preparation step (i.e., step S100), the field curvature lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing. In this case, the second lens component may not include a motor. In the bonding step (i.e., step S400), the bonding of the second lens component and the field curvature lens component is achieved by bonding the second lens component and the motor carrier. Further, by bonding the field curvature lens component and the photosensitive component (or otherwise mounting it on the photosensitive component), an imaging module can be obtained.

[0102] It should be noted that in the above embodiments, the bonding step can be replaced by other types of connection steps such as laser welding. In other words, in the present application, any connection process can be used to replace the bonding process as long as the relative positions of the at least one imaging lens component and the field curvature lens component (or field curvature component) can be maintained at the relative positions determined by the active calibration.

[0103] The active calibration process used in the optical lens or camera module assembly method will be further introduced below. When the number of components prepared in the preparation step is three or more, active calibration needs to be performed on multiple gaps between multiple components, and the active calibration at these multiple gaps can be carried out synchronously. For example, in one embodiment, the active calibration between the first lens component and the second lens component, and the active calibration between the second lens component and the field curvature lens component (or field curvature component) can be carried out synchronously. For the sake of brief description, the active calibration between the first lens component and the second lens component will be taken as an example for illustration below.

[0104] The active calibration described in this application can adjust the relative positions of the first lens component and the second lens component in multiple degrees of freedom. Figure 10A The relative position adjustment method in the active calibration in one embodiment of the present invention is shown. In this adjustment method, the first lens component (which can also be the first lens) can move relative to the second lens component along the x, y, and z directions (that is, the relative position adjustment in this embodiment has three degrees of freedom). Among them, the z direction is the direction along the optical axis, and the x and y directions are the directions perpendicular to the optical axis. Both the x and y directions are within an adjustment plane P, and the translation within this adjustment plane P can be decomposed into two components in the x and y directions.

[0105] Figure 10B The rotation adjustment in the active calibration of another embodiment of the present invention is shown. In this embodiment, in addition to having Figure 10A the three degrees of freedom, a rotation degree of freedom, that is, the adjustment in the r direction, is added. In this embodiment, the adjustment in the r direction is a rotation within the adjustment plane P, that is, a rotation around an axis perpendicular to the adjustment plane P.

[0106] Furthermore, Figure 10C The relative position adjustment method with the addition of the v and w direction adjustments in the active calibration of another embodiment of the present invention is shown. Among them, 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 in the v and w directions can be combined into a vector angle, and this vector angle represents the total tilt state. That is to say, by adjusting the v and w directions, the tilt attitude of the first lens component relative to the second lens component can be adjusted (that is, the tilt of the optical axis of the first lens component relative to the optical axis of the second lens component).

[0107] The adjustments of the above six degrees of freedom of x, y, z, r, v, and w may all affect the imaging quality of the optical system (for example, affect the magnitude of the resolution). In other embodiments of the present invention, the relative position adjustment method can be to adjust only any one of the above six degrees of freedom, or a combination of any two or more of them.

[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, i.e., movement in the x and y directions.

[0109] 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 further includes: adjusting and determining the included 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, i.e., adjustment in the w and v directions. In the assembled optical lens or camera module, there may be a non-zero included angle between the axis of the first lens component and the axis of the second lens component.

[0110] 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 further includes: moving the first lens component along a direction perpendicular to the adjustment plane (i.e., adjustment in the z direction), and determining the relative position between 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, pre-positioning is first performed to have 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 then the adhesive material is disposed in the gap and the adhesive material is cured. In this embodiment, the first lens may be formed by a plurality of sub-lenses that are mutually fitted or bonded to form an integral body. In this embodiment, the side surface and the top surface of the non-optical surface of the first lens 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 surface and the top surface of the first lens.

[0112] In one embodiment, in the active calibration step, the second lens component may be fixed, and the first lens component is clamped by a fixture. Driven by a six-axis motion mechanism connected to the fixture, the first lens component is moved, so as to realize the relative movement of the first lens component and the second lens component under the above six degrees of freedom. Among them, the fixture may rest on or partially rest on the side surface of the first lens component, so as to clamp the first lens component and perform multi-degree-of-freedom position adjustment.

[0113] In the above embodiments, the actual imaging result of the optical system composed of multiple lens groups can be obtained according to the image data output by the photosensitive chip. In the active calibration technology, a target board can be arranged on the object side, the photosensitive component is powered on, and the image data of imaging the target board is directly output by the photosensitive component. Based on this image data, the resolution data of the optical system to be calibrated can be obtained, and then it can be judged whether the imaging quality meets the standard.

[0114] The above description is only the preferred embodiment of the present application and the explanation of the applied technical principle. 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 the specific combination of the above technical features, and 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 technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. Optical lens, characterized in that, it includes: A field curvature lens component, which includes a field curvature lens group, and the field curvature lens group includes at least one lens; A first lens component, which includes a first lens group, and the first lens group includes at least one lens; and A second lens component, which includes a second lens group, and the second lens group includes at least one lens. The first lens group, the second lens group and the field curvature lens group jointly form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; and There is a first gap between the field curvature lens component and the second lens component, and the field curvature of the optical system is compensated by adjusting the first gap; The first lens component and the second lens component are bonded together by a second adhesive material. After curing, the second adhesive material supports and fixes the first lens component and the second lens component, so that the relative position between the first lens component and the second lens component remains at the relative position determined by active calibration, wherein the relative position determined by active calibration enables the imaging clarity of the optical system to meet the standard.

2. The optical lens according to claim 1, characterized in that, The field curvature lens group only has one lens, and the lens is a lens without a lens barrel; or, the field curvature lens component includes a lens barrel and one or more lenses, and the one or more lenses are installed in the lens barrel; The field curvature lens component and the second lens component are bonded together by a first adhesive material. After curing, the first adhesive material supports and fixes the field curvature lens component and the second lens component, so that the relative position between the field curvature lens component and the second lens component remains at the relative position determined by active calibration, wherein the active calibration is to adjust the relative position between the first lens component and the second lens component, and the relative position between the second lens component and the field curvature lens component based on the actual imaging result of the optical system.

3. The optical lens according to claim 1, characterized in that, Among multiple optical lenses under the same optical design, there are at least a first optical lens and a second optical lens. The size of the first gap of the first optical lens in the optical axis direction of the optical lens is different from the size of the first gap of the second optical lens in the optical axis direction of the optical lens.

4. The optical lens according to claim 2, characterized in that, The second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the second lens group is installed on the motor carrier; the first adhesive material is located between the motor housing and the field curvature lens component.

5. Camera module, characterized in that, it includes: At least one imaging lens component, wherein each imaging lens component includes an imaging lens group, and the imaging lens group includes at least one lens; and A field curvature component, which includes a photosensitive component and a field curvature lens group fixed to the photosensitive component, the field curvature lens group includes at least one lens, and all the imaging lens groups and the field curvature lens group together form an imaging optical system; Wherein, there is a first gap between the field curvature component and the imaging lens component, and the field curvature of the optical system is compensated by adjusting the first gap; The at least one imaging lens component includes: A first lens component, which includes a first lens group, and the first lens group includes at least one lens; and A second lens component, which includes a second lens group, and the second lens group includes at least one lens. The first lens group, the second lens group and the field curvature lens group together form an imaging optical system, and the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; Wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located between the first lens group and the field curvature lens group; the field curvature component and the imaging lens component are bonded by a first adhesive material arranged in the first gap, and the first adhesive material supports and fixes the field curvature component and the imaging lens component after curing, so that the relative position between the field curvature component and the imaging lens component is maintained at the relative position determined by active calibration; the first lens component and the second lens component are bonded together by a second adhesive material, and the second adhesive material supports and fixes the first lens component and the second lens component after curing, so that the relative position between the first lens component and the second lens component is maintained at the relative position determined by active calibration, wherein the relative position determined by active calibration enables the imaging clarity of the optical system to meet the standard.

6. The imaging module according to claim 5, characterized in that, Among multiple imaging modules under the same optical design, there are at least a first imaging module and a second imaging module, and the size of the first gap of the first imaging module in the optical axis direction of the imaging module is different from the size of the first gap of the second imaging module in the optical axis direction of the imaging module.

7. The imaging module according to claim 5, characterized in that, The field curvature lens group only has one lens, and the lens abuts against the color filter of the photosensitive component.

8. The imaging module according to claim 5, characterized in that, The second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the second lens group is mounted on the motor carrier; the first adhesive material is located between the motor housing and the field curvature component; and the first lens group includes at least one variable-focus liquid lens.

9. The imaging module according to claim 5, characterized in that, The number of the imaging lens components is one, the imaging lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, and the imaging lens component is mounted on the motor carrier.

10. The camera module according to claim 8 or 9, characterized in that, wherein the active calibration adjusts the relative positions of the first lens component and the second lens component, and the relative position of the second lens component and the field curvature component based on the actual imaging result of the optical system; the photosensitive component includes a photosensitive chip, and the actual imaging result is obtained according to the image data output by the photosensitive chip.

11. The camera module according to claim 10, characterized in that, the photosensitive component further includes: a circuit board, on the surface of which the photosensitive chip is mounted; a lens holder, which is mounted on or formed on the surface of the circuit board and surrounds the photosensitive chip; and a color filter, which is mounted on the lens holder; wherein the field curvature lens group abuts against the top surface of the lens holder and / or the top surface of the color filter.

12. The camera module according to claim 11, characterized in that, the field curvature component and the imaging lens component are bonded by a first adhesive material disposed in the first gap, the first adhesive material is located between the lens holder and the motor housing, and the field curvature lens group and the motor carrier are separated from each other.

13. The camera module according to claim 5, characterized in that, the field curvature lens group includes a microlens array.

14. An optical lens assembly method, characterized in that, comprising: preparing a field curvature lens component and at least one imaging lens component, wherein the field curvature lens component and the imaging lens component are separated from each other, each of the imaging lens components includes an imaging lens group, each of the imaging lens groups includes at least one lens, the field curvature lens component includes a field curvature lens group, and the field curvature lens group includes at least one lens; pre-positioning the at least one imaging lens component and the field curvature lens component so that the at least one imaging lens group and the field curvature lens group together form an imaging optical system; performing active calibration on the at least one imaging lens component and the field curvature lens component, and the active calibration adjusts the relative positions of the at least one imaging lens component and the field curvature lens component based on the actual imaging result of the optical system; wherein the field curvature of the optical system is compensated by adjusting a first gap between the imaging lens component and the field curvature lens component; and connecting the at least one imaging lens component and the field curvature lens component so that the relative positions of the at least one imaging lens component and the field curvature lens component are maintained at the relative positions determined by the active calibration; wherein, in the preparation step, the at least one imaging lens component includes a first lens component and a second lens component, wherein the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens; the sensitivity of the first lens group to imaging clarity is higher than that of the field curvature lens group; In the connecting step, the first lens component is bonded to the second lens component such that the relative positions of the first lens component and the second lens component are maintained at the relative positions determined by active calibration; and the second lens component is bonded to the field curvature lens component such that the relative positions of the second lens component and the field curvature lens component are maintained at the relative positions determined by active calibration; and wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; In the active calibration step, the imaging clarity of the optical system is made to meet the standard by adjusting the position of the first lens component.

15. The optical lens assembly method according to claim 14, wherein, In the pre-positioning step, the first lens component, the second lens component and the field curvature lens component are pre-positioned such that the first lens group, the second lens group and the field curvature lens group together form an image-forming optical system; In the active calibration step, the active calibration adjusts the relative positions of the first lens component, the second lens component and the field curvature lens component based on the actual imaging result of the optical system.

16. The optical lens assembly method according to claim 15, wherein, In the active calibration step, the field curvature of the optical system is made to meet the standard by adjusting the position of the field curvature lens component.

17. The optical lens assembly method according to claim 16, wherein, In the active calibration step, the field curvature of the optical system is compensated by adjusting the distance between the field curvature lens component and the second lens component in the optical axis direction of the optical lens so that the field curvature of the optical system meets the standard.

18. The optical lens assembly method according to claim 15, wherein, In the preparation step, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens; and In the connecting step, the bonding of the second lens component and the field curvature lens component is achieved by bonding the motor housing to the field curvature lens component.

19. The method for assembling a camera module, wherein, comprises: Preparing a field curvature component and at least one imaging lens component, wherein the field curvature component and the imaging lens component are separated from each other, each imaging lens component includes an imaging lens group, each imaging lens group includes at least one lens, the field curvature component includes a photosensitive component and a field curvature lens group fixed to the photosensitive component, and the field curvature lens group includes at least one lens; Pre-positioning the at least one imaging lens component and the field curvature component such that the imaging lens group and the field curvature lens group together form an image-forming optical system; Perform active calibration on the at least one imaging lens component and the field curvature component, where the active calibration adjusts the relative positions of the at least one imaging lens component and the field curvature component based on the actual imaging result of the optical system; Compensate for the field curvature of the optical system by adjusting the first gap between the imaging lens component and the field curvature component; And Connect the at least one imaging lens component and the field curvature component to keep the relative positions of the at least one imaging lens component and the field curvature component at the relative positions determined by the active calibration; Wherein, in the preparation step, the at least one imaging lens component includes a first lens component and a second lens component, where the first lens component includes a first lens group, and the first lens group includes at least one lens; the second lens component includes a second lens group, and the second lens group includes at least one lens; the first lens group is more sensitive to imaging clarity than the field curvature lens group; In the connection step, bond 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 kept at the relative positions determined by the active calibration, and bond the second lens component and the field curvature component so that the relative positions of the second lens component and the field curvature component are kept at the relative positions determined by the active calibration; and wherein, the first lens group is located at the front end of the second lens group, and the second lens group is located at the front end of the field curvature lens group; In the active calibration step, adjust the position of the first lens component to make the imaging clarity of the optical system meet the standard.

20. The method for assembling a camera module according to claim 19, Characterized in that In the pre-positioning step, pre-position the first lens component, the second lens component and the field curvature component so that the first lens group, the second lens group and the field curvature lens group together form an imaging optical system; In the active calibration step, the active calibration adjusts the relative positions of the first lens component, the second lens component and the field curvature component based on the actual imaging result of the optical system.

21. The method for assembling a camera module according to claim 20, Characterized in that In the active calibration step, adjust the position of the field curvature component to make the field curvature of the optical system meet the standard.

22. The method for assembling a camera module according to claim 21, Characterized in that In the active calibration step, compensate for the field curvature of the optical system by adjusting the distance between the field curvature component and the second lens component in the optical axis direction of the camera module so that the field curvature of the optical system meets the standard.

23. The method for assembling a camera module according to claim 21, Characterized in that In the preparation step, the second lens component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing, the second lens group is mounted on the motor carrier, and the first lens group includes at least one variable-focus liquid lens; and In the connection step, the adhesion between the second lens component and the field curvature component is achieved by adhering the motor housing to the field curvature component.

24. The method for assembling an imaging module according to claim 21, wherein, In the preparation step, the field curvature component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; The preparation step further includes: fixing the motor housing to the photosensitive component and / or the field curvature lens group, and keeping the field curvature lens group and the motor carrier separated from each other; and In the connection step, the adhesion between the second lens component and the field curvature component is achieved by adhering the second lens component to the motor carrier.

25. The method for assembling an imaging module according to claim 19, wherein, In the preparation step, the field curvature component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; The preparation step further includes: fixing the motor housing to the photosensitive component and / or the field curvature lens group, and keeping the field curvature lens group and the motor carrier separated from each other; and In the connection step, the adhesion between the imaging lens component and the field curvature component is achieved by adhering the imaging lens component to the motor carrier.

26. The method for assembling an imaging module according to claim 21, wherein, In the preparation step, the field curvature component further includes a motor, the motor includes a motor housing and a motor carrier, the motor carrier is movably connected to the motor housing; and In the connection step, the adhesion between the second lens component and the field curvature component is achieved by adhering the second lens component to the motor carrier.

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