Optical Zoom Camera Module and Its Assembly Method

Abstract

The present invention provides an optical zoom camera module, comprising: at least two camera module components and a glue material; each of the at least two camera module components respectively has at least one lens group, and each lens group includes at least one lens. All the lens groups of the at least two camera module components together constitute an imaging optical system, and at least two of the lens groups are movable lens groups. At least two of the movable lens groups are respectively fixed to different motor carriers and are respectively moved under the drive of a motor; wherein, the cured glue material fixes and supports the at least two camera module components, so that the relative positions of the at least two camera module components are maintained at the relative positions determined by active calibration. The present invention also provides a corresponding method for assembling an optical zoom camera module. The present invention can achieve stepless zoom; is beneficial to improving the imaging quality of the zoom camera module; and can reduce production costs.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging technology. Specifically, the present invention relates to an optical zoom 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, the pursuit of shooting quality by users 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. Because the optical systems of large-aperture and wide-angle camera modules are more sensitive, the reliability of their manufacturing and verification processes will be more fragile than conventional designs. Therefore, there is a need for a lens with a better structure now.

[0003] On the other hand, in the mobile phone camera module industry, in order to continuously pursue better imaging performance and optical zoom effect, the total number of lens pieces will continue to increase. The increase in the number of lenses leads to an increase in assembly error items and an increase in the cumulative tolerance. To achieve optical zoom without the image becoming blurred, at least two relatively movable lens groups are required. The relative position accuracy during the assembly of several groups that need to move relative to each other will be an important parameter affecting the imaging effect of the camera module. However, when the number of groups increases, the relative positions that need to be guaranteed between each group also increase, and the assembly difficulty continuously improves. This results in extremely high requirements for the manufacturing accuracy of single lenses and the assembly accuracy of single groups for optical variable (optical zoom) camera modules with high-specification imaging performance. The assembly process level has become the bottleneck for product specification improvement. In other words, only under the premise of extremely high requirements for the incoming materials is it possible to assemble a product with compliant relative positions between groups and qualified performance for the optical variable camera module. Therefore, in the prior art, the cost of optical variable camera modules (especially compact optical variable camera modules, such as those that can be installed in mobile phones) is extremely high, and the yield is also difficult to guarantee (because it is difficult to achieve the quality of the incoming materials). It has become very difficult to assemble high-performance lenses and achieve mass production.

[0004] Furthermore, in the prior art, for a compact optical variable camera module, when the lens is assembled into the lens barrel (this process is called assembly), only some physical dimensions of a single group can be obtained, and the optical performance of the product cannot be obtained. Therefore, usually, only after all the lenses are installed in the lens barrel, and then each group is combined to obtain a complete optical system, and finally the optical performance test is carried out. However, at this time, it is no longer possible to repair and improve the performance of all lens groups. Therefore, usually, the detected defective products can only be scrapped, which further increases the production cost of the compact optical variable camera module. Summary of the Invention

[0005] The present invention aims to provide a solution that can overcome at least one defect of the prior art.

[0006] According to one aspect of the present invention, an optical zoom camera module is provided, including: at least two camera module components and a glue material located between the at least two camera module components; each of the at least two camera module components respectively has at least one lens group, each lens group includes at least one lens, and all the lens groups of the at least two camera module components together constitute an imaging optical system, and at least two of the lens groups are movable lens groups, and at least two of the movable lens groups are respectively fixed to different motor carriers and move respectively under the drive of a motor; wherein, the cured glue material fixes and supports the at least two camera module components, so that the relative positions of the at least two camera module components are maintained at the relative positions determined by active calibration, and the active calibration is to adjust the relative positions of the at least two camera module components based on the actual imaging result of the optical system.

[0007] Wherein, the at least two camera module components include a second camera module component, and the second camera module component includes a motor housing, a first motor carrier, a second motor carrier and a second lens group, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, and the second lens group is mounted on the second motor carrier.

[0008] Wherein, the at least two camera module components further include a first camera module component, which includes a first lens group.

[0009] Wherein, the glue material includes a first glue material, the first glue material is located between the first camera module component and the first motor carrier, and after the first glue material is cured, it fixes and supports the first camera module component and the first motor carrier so that their relative positions are maintained at the relative positions determined by the above-mentioned active calibration, and the axes of the first camera module component and the first motor carrier have a non-zero included angle.

[0010] Wherein, the second camera module component further includes a first sub-lens group, and the first sub-lens group is mounted on the first motor carrier; and the at least two camera module components further include a first camera module component, which includes a first upper sub-lens group.

[0011] Among them, the adhesive material includes a first adhesive material, which is located between the upper subgroup of the first lens group and the lower subgroup of the first lens group, and after the first adhesive material is cured, it fixes and supports the upper subgroup of the first lens group and the lower subgroup of the first lens group, so that the relative positions of the two are maintained at the relative positions determined by the active calibration, wherein the axes of the upper subgroup of the first lens group and the lower subgroup of the first lens group have a non-zero included angle.

[0012] Among them, the at least two camera module components further include a third camera module component, which includes a photosensitive component and a third lens group mounted on the photosensitive component.

[0013] Among them, the adhesive material further includes a second adhesive material, which is located between the photosensitive component and the motor housing, and after the second adhesive material is cured, it fixes and supports the photosensitive component and the motor housing so that the relative positions of the two are maintained at the relative positions determined by the active calibration, wherein the axes of the photosensitive component and the motor housing have a non-zero included angle.

[0014] Among them, the second camera module component further includes a third lens group, and the third lens group is fixed to the motor housing.

[0015] Among them, the first motor carrier is driven by an electromagnetic drive module or a piezoelectric drive module, and the second motor carrier is driven by an electromagnetic drive module or a piezoelectric drive module.

[0016] Among them, the first motor carrier and / or the second motor carrier achieve the movable connection through a shrapnel; or the first motor carrier and / or the second motor carrier achieve the movable connection through the combination of a ball and a motion guide.

[0017] Among them, the actual imaging result of the optical system is: within the entire stroke of the at least two movable lens groups, the measured value of the optical performance of the optical system based on the actual imaging result; or: at multiple representative positions representing the entire stroke of the at least two movable lens groups, the measured value of the optical performance of the optical system based on the actual imaging result.

[0018] According to another aspect of the present invention, there is also provided an optical zoom camera module assembly method, including: preparing at least two camera module components separated from each other, each of the at least two camera module components respectively having at least one lens group, at least two of the lens groups of the at least two camera module components being movable lens groups, and at least two of the movable lens groups being respectively fixed to different motor carriers and thus respectively moving driven by a motor; pre-positioning the at least two camera module components so that all the lens groups of the at least two camera module components together form an imaging optical system; actively calibrating the at least two camera module components, wherein the relative positions of the at least two camera module components are adjusted based on the actual imaging result of the optical system; and bonding the at least two camera module components by an adhesive material so that the relative positions of the at least two camera module components are maintained at the relative positions determined by the active calibration.

[0019] Wherein, in the preparation step, the at least two camera module components include a first camera module component and a second camera module component; wherein, the first camera module component includes a first lens group, and the second camera module includes a second lens group, a motor housing, a first motor carrier and a second motor carrier, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, and the second lens group is mounted on the second motor carrier.

[0020] Wherein, in the bonding step, the adhesive material includes a first adhesive material, the first adhesive material is disposed between the first camera module component and the first motor carrier, and then the first adhesive material is cured, and the cured first adhesive material fixes and supports the first camera module component and the first motor carrier so that their relative positions are maintained at the relative positions determined by the active calibration.

[0021] Wherein, in the preparation step, the at least two camera module components include a first camera module component and a second camera module component; the first camera module component includes an upper subgroup of the first lens group, and the second camera module includes a lower subgroup of the first lens group, a second lens group, a motor housing, a first motor carrier and a second motor carrier, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, the lower subgroup of the first lens is mounted on the first motor carrier, and the second lens group is mounted on the second motor carrier.

[0022] Among them, in the bonding step, the adhesive material includes a first adhesive material. The first adhesive material is disposed between the upper subgroup of the first lens group and the lower subgroup of the first lens group, and then the first adhesive material is cured. The cured first adhesive material fixes and supports the upper subgroup of the first lens group and the lower subgroup of the first lens group so that their relative positions are maintained at the relative positions determined by the active calibration.

[0023] Among them, in the preparation step, the second camera module component further includes a third lens group fixed to the motor housing.

[0024] Among them, in the preparation step, the at least two camera module components further include a third camera module component, which includes a photosensitive component and a third lens group mounted on the photosensitive component.

[0025] Among them, in the bonding step, the adhesive material further includes a second adhesive material. The second adhesive material is disposed between the photosensitive component and the motor housing, and then the second adhesive material is cured. The cured second adhesive material fixes and supports the photosensitive component and the motor housing so that their relative positions are maintained at the relative positions determined by the active calibration.

[0026] Among them, in the preparation step, the photosensitive component includes a color filter, and the third lens group is attached to the color filter.

[0027] Among them, in the active calibration step, the at least three camera module components are actively calibrated by fixing the second camera module component and moving the first camera module component and the third camera module component in multiple degrees of freedom.

[0028] Among them, the active calibration step further includes: within the entire stroke of the at least two movable lens groups, obtaining the measured optical performance value of the optical system based on the actual imaging result; or at multiple representative positions representing the entire stroke of the at least two movable lens groups, obtaining the measured optical performance value of the optical system based on the actual imaging result.

[0029] Compared with the prior art, the present invention has at least one of the following technical effects:

[0030] 1. The present invention can achieve stepless zoom of the camera module.

[0031] 2. The present invention can achieve active calibration of the zoom lens based on the optical imaging quality, which is beneficial to improving the imaging quality of the zoom camera module.

[0032] 3. The present invention helps to reduce the requirements for the precision of incoming materials and helps to reduce the production cost of the optical zoom camera module (especially the compact optical zoom camera module).

[0033] 4. In the present invention, for the incoming materials that cannot be adjusted to meet the performance standards, only a single group can be discarded, or the replaced group can be assembled with other groups (in the case of seeking deviation cancellation between groups), so the production cost can be reduced.

[0034] 5. The present invention can avoid the increase in the thickness of the terminal device (such as a smart phone) through a periscope design. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Exemplary embodiments are shown in the accompanying drawings. The embodiments and drawings disclosed herein should be regarded as illustrative and not restrictive.

[0036] Figure 1 A cross-sectional schematic diagram of an optical zoom camera module according to an embodiment of the present invention is shown;

[0037] Figure 2 A cross-sectional schematic diagram of an optical zoom camera module according to another embodiment of the present invention is shown;

[0038] Figure 3 A cross-sectional schematic diagram of an optical zoom camera module according to another embodiment of the present invention is shown;

[0039] Figure 4 A schematic diagram of an optical zoom optical lens according to another embodiment of the present invention is shown;

[0040] Figure 5 A periscope optical zoom camera module according to an embodiment of the present invention is shown;

[0041] Figure 6A A relative position adjustment method in active calibration according to an embodiment of the present invention is shown;

[0042] Figure 6B A rotational adjustment in active calibration according to another embodiment of the present invention is shown;

[0043] Figure 6C A relative position adjustment method with added v and w direction adjustments in active calibration according to still another embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the 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.

[0045] It should be noted that in this specification, the expressions such as first, second, etc. are only used to distinguish one feature from another, and do not represent any limitation on the features. Therefore, without departing from the teachings of this application, the first body discussed below may also be referred to as the second body.

[0046] In the drawings, for the sake of clarity, the thickness, dimensions and shape of the objects have been slightly exaggerated. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0047] It should also be understood that the terms "comprising", "comprising of", "having", "containing" and / or "containing of", when used in this specification, denote the presence of the stated features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof. Further, when an expression such as "at least one of..." appears after a list of listed features, it modifies the entire list of listed features, rather than individual elements in the list. Further, when describing embodiments of this application, the use of "may" means "one or more embodiments of this application". And the term "exemplary" is intended to refer to an example or illustration.

[0048] As used herein, the terms "substantially", "about" and similar terms are used as terms of approximation, rather than as terms of 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.

[0049] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by a person 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.

[0050] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. The following will describe this application in detail with reference to the drawings and in combination with the embodiments.

[0051] Figure 1 A cross-sectional schematic view of an optical zoom camera module according to an embodiment of the present invention is shown. Refer to Figure 1, in this embodiment, the optical zoom camera module includes three camera module components and a glue material for bonding these three camera modules together. The three camera module components are the first camera module component 100, the second camera module component 200, and the third camera module component 300 respectively. The first camera module component 100 includes a first lens group 110. The second camera module component 200 includes a motor housing 210, a first motor carrier 220, a second motor carrier 230, and a second lens group 240. Wherein the first motor carrier 220 and the second motor carrier 230 are respectively movably connected to the motor housing 210, and the second lens group 240 is mounted on the second motor carrier 230. The glue material includes a first glue material 410, and the first glue material 410 is located between the first camera module component 100 and the first motor carrier 220. After the first glue material 410 is cured, it fixes and supports the first camera module component 100 and the first motor carrier 220 so that their relative positions are maintained at the relative positions determined by the active calibration. In the actual production process, due to the manufacturing tolerances of the optical elements themselves and the assembly tolerances during the process of assembling the optical elements into lens groups, the positions determined by the active calibration to achieve the best imaging effect may be relatively inclined. In other words, the axes of the first camera module component and the first motor carrier may have a non-zero included angle. The third camera module component 300 includes a photosensitive component 310 and a third lens group 320 mounted on the photosensitive component 310. The glue material further includes a second glue material 420, and the second glue material 420 is located between the photosensitive component 310 and the motor housing 210. After the second glue material is cured, it fixes and supports the photosensitive component and the motor housing so that their relative positions are maintained at the relative positions determined by the active calibration. Similarly, due to the manufacturing tolerances of the optical elements themselves and the assembly tolerances during the process of assembling the optical elements into lens groups, the positions determined by the active calibration to achieve the best imaging effect may be relatively inclined. In other words, the axes of the photosensitive component and the motor housing may have a non-zero included angle. Refer to Figure 1 It can be seen that in this embodiment, the first motor carrier and the second motor carrier share the same motor housing.

[0052] Figure 2 The cross-sectional schematic diagram of the optical zoom camera module according to another embodiment of the present invention is shown. Refer to Figure 2, in this embodiment, the optical zoom camera module includes three camera module components and an adhesive material for bonding these three camera module components together. The three camera module components are respectively a first camera module component 100, a second camera module component 200, and a third camera module component 300. The first camera module component 100 includes an upper subgroup 111 of the first lens group. The second camera module component 200 includes a motor housing 210, a first motor carrier 220, a second motor carrier 230, a lower subgroup 112 of the first lens group, and a second lens group 240. Wherein the first motor carrier 220 and the second motor carrier 230 are respectively movably connected to the motor housing 210, and the second lens group 240 is mounted on the second motor carrier 230, and the lower subgroup 112 of the first lens group is mounted on the first motor carrier 220. The adhesive material includes a first adhesive material 410, and the first adhesive material 410 is located between the upper subgroup 111 of the first lens group and the lower subgroup 112 of the first lens group. After the first adhesive material 410 is cured, it fixes and supports the upper subgroup 111 of the first lens group and the lower subgroup 112 of the first lens group, so that their relative positions are maintained at the relative positions determined by the active calibration. After bonding is completed, the upper subgroup 111 of the first lens group and the lower subgroup 112 of the first lens group together form a first lens group 110, and the first lens group 110 can move under the drive of the first motor carrier 220. Due to the manufacturing tolerances of the optical elements themselves and the assembly tolerances in the process of assembling the optical elements into lens groups, the position determined by the active calibration to achieve the best imaging effect may be relatively inclined. In other words, the axes of the upper subgroup of the first lens group and the lower subgroup of the first lens group may have a non-zero included angle. Further, the third camera module component 300 includes a photosensitive component 310 and a third lens group 320 mounted on the photosensitive component 310. The adhesive material further includes a second adhesive material 420, and the second adhesive material 420 is located between the photosensitive component 310 and the motor housing 210. After the second adhesive material 420 is cured, it fixes and supports the photosensitive component and the motor housing, so that their relative positions are maintained at the relative positions determined by the active calibration. Similarly, due to the manufacturing tolerances of the optical elements themselves and the assembly tolerances in the process of assembling the optical elements into lens groups, the position determined by the active calibration to achieve the best imaging effect may be relatively inclined. In other words, the axis of the photosensitive component and the axis of the motor housing may have a non-zero included angle.

[0053] In the above embodiments, among the three lens groups, there is a zoom lens group and a pair of focusing lens groups (i.e., the first lens group and the second lens group), which can achieve stepless zoom. Moreover, in the above embodiments, the three camera module components are assembled based on the positional relationship determined by active calibration, which helps to reduce the requirements for the accuracy of incoming materials and helps to reduce the production cost of the optical zoom camera module (especially the compact optical zoom camera module).

[0054] Further, still referring to Figure 1 , in one embodiment, in the third camera module component, the photosensitive component 310 includes a circuit board 312, a photosensitive chip 313 mounted on the surface of the circuit board 312, a lens holder 314 mounted on the surface of the circuit board 312 and surrounding the photosensitive chip 313, and a color filter 311 mounted on the lens holder 314. The third lens group 320 can be attached to the color filter 311. The top surface of the lens holder 314 has a flat surface 314a exposed outside the color filter 311, and this flat surface 314a can be used as the glue application surface for arranging the second adhesive 420. In other words, the second adhesive can be located between the top surface of the lens holder and the bottom surface of the second motor housing (or the shared motor housing). At this time, the top surface of the lens holder can be regarded as the top surface of the photosensitive component. In this embodiment, the lens barrel of the third lens group can be omitted, which helps to reduce the size of the camera module. Moreover, the third lens group can move together with the photosensitive component during the active calibration process, so as to adjust its relative position with the first and second lens groups, thereby improving the imaging quality of the camera module. It should be noted that the structure of the photosensitive component of the present invention is not limited to the above embodiments.

[0055] Further,[[]] Figure 3 shows a cross-sectional schematic view of an optical zoom camera module according to another embodiment of the present invention. Referring to Figure 3 , in this embodiment, the optical zoom camera module includes two camera module components, an adhesive for bonding the two camera module components together, and a photosensitive component. This embodiment is the same as Figure 1The difference between the embodiment of the present invention and the embodiment of the present invention is that the third lens group 320 is installed in the motor housing 210, that is, as a part of the second camera module component 200. Specifically, in this embodiment, the optical zoom camera module includes a first camera module component 100 and a second camera module component 200. The first camera module component 100 includes a first lens group 110. The second camera module component 200 includes a motor housing 210, a first motor carrier 220, a second motor carrier 230, a second lens group 240 and a third lens group 320. The first motor carrier 220 and the second motor carrier 230 are respectively movably connected to the motor housing 210, and the second lens group 240 is installed on the second motor carrier 230, and the third lens group 320 is fixed to the motor housing 210. The adhesive material includes a first adhesive material 410, which is located between the first camera module component 100 and the first motor carrier 220, and the first adhesive material fixes and supports the first camera module component and the first motor carrier after curing so that the relative position of the two is maintained at the relative position determined by the active calibration. In the actual production process, due to the manufacturing tolerance of the optical element itself and the assembly tolerance of the process of assembling the optical element into a lens group, the position determined by the active calibration to achieve the best imaging effect may be relatively inclined. In other words, the axis of the first camera module component and the axis of the first motor carrier may have a non-zero angle. Further, the photosensitive component 310 can be bonded to the second camera module component 200 through a third adhesive material 430. The third adhesive material 430 can be arranged between the top surface of the photosensitive component 310 and the bottom surface of the second camera module component 200. The bottom surface of the second camera module component 200 can be the bottom surface of the motor housing and / or the bottom surface of the structural area of ​​the third lens group. The third lens group includes a structure zone and an optical zone, wherein the optical zone is a zone used for optical imaging, and the structure zone is a portion surrounding the optical zone (usually serving as a structure member).

[0056] Further, Figure 4 FIG. 2 is a schematic diagram of an optical zoom lens according to another embodiment of the present invention. Figure 3 Compared with the embodiment of Figure 3 The same as the embodiment.

[0057] Furthermore, in a modified embodiment, Figure 2 The third lens group in the camera module shown is fixed to the motor housing (i.e., the third lens group is a part of the second lens component), and the upper subgroup of the first lens group and the lower subgroup of the first lens group are bonded based on the active calibration technology to obtain an optical zoom optical lens. Finally, the optical zoom optical lens is installed on the photosensitive component to obtain an optical zoom camera module.

[0058] In the above embodiments, the motors that can be used can be piezoelectric motors (motors driven by piezoelectric ceramics), voice coil motors (VCM motors, and such motors usually use shrapnel to achieve the movable connection of the motor carrier), ball motors (usually achieve the movable connection of the motor carrier through the combination of balls and motion guiding members such as guide rails), and various forms of optical actuators. When a voice coil motor is used, the motor carrier (such as the first motor carrier and / or the second motor carrier) is driven by an electromagnetic drive module. Driven by the drive module, the motor carrier can move relative to the motor housing along the optical axis direction within the designed stroke range. In the above embodiments, at least two motor carriers can move separately driven by the drive module, so as to achieve optical zoom. Moreover, in some embodiments of the present invention, the movement of the motor carrier can also deviate from the direction of the optical axis, so as to achieve other optical functions such as optical image stabilization.

[0059] It should be noted that the above embodiments are not exhaustive, and there are many variant implementation manners for the optical zoom camera module of the present invention. For example, in a variant embodiment, the lens group constituting the optical system can be more than three. For another example, in another variant embodiment, the third lens group can be separated from the photosensitive component, and first two (or more) optical lens components (i.e., the camera module components described above) are assembled into an optical zoom lens (this optical zoom lens is assembled based on active calibration technology, such as Figure 4 ). Then, the optical zoom lens is assembled with the photosensitive component. For yet another example, in yet another variant embodiment, the third camera module component can further include a third motor carrier, the third lens group can be installed on the third motor carrier, and then three (or more) camera module components are assembled together based on active calibration technology. In this way, in the camera module, there can be three lens groups with zoom adjustment capabilities.

[0060] In summary, in the present invention, the optical zoom camera module includes at least two camera module components and an adhesive material located between the at least two camera module components; each of the at least two camera module components respectively has a lens group, and each lens group includes at least one lens. All the lens groups of the at least two camera module components together constitute an imaging optical system, and at least two of the lens groups are fixed to a motor carrier and can move driven by the motor; wherein, the cured adhesive material fixes and supports the at least two camera module components, so that the relative positions of the at least two camera module components are maintained at the relative positions determined by active calibration, and the active calibration is to adjust the relative positions of the at least two camera module components based on the actual imaging result of the optical system.

[0061] In the above embodiments, the lens group may be a single lens or may be formed by assembling a plurality of lenses. When the lens group is formed by assembling a plurality of lenses, the plurality of lenses may be assembled together by fitting or bonding with each other, or may be assembled together based on a lens barrel. For example, in one embodiment, the first lens group may be a single first lens, the second lens group may be a plurality of second lenses sequentially inserted into the lens barrel, and the third lens group may be a single third lens. In other words, the number of lenses in each lens group can be flexibly determined according to the optical design. The assembly method of the lens group can also be adjusted as needed. When the lens group is assembled through a lens barrel, the camera module components in the foregoing embodiments may include the lens barrel. For example, the outer side surface of the lens barrel may be threadedly connected to the inner side surface of the motor carrier.

[0062] Further, in one embodiment, the motor carrier (which may be the first motor carrier or the second motor carrier) and the motor housing may be threadedly connected or rail-connected. Since the motor carrier and the motor housing are movably connected, in the case of threaded connection or rail connection, the thread or rail can be used as a movement guide for the motor carrier.

[0063] Further, Figure 5 A periscope optical zoom camera module in an embodiment of the present invention is shown. Refer to Figure 5 , the periscope optical zoom camera module includes an optical path turning device 2000 and an optical zoom camera module 1000. The optical path turning device 2000 is configured to turn the incident light by 90 degrees to enter the light incident surface of the optical system (referring to the optical system composed of a plurality of lens groups). The optical path turning device 2000 may be a light reflection prism. In this embodiment, the optical axis direction of the optical zoom camera module is perpendicular to the thickness direction of the terminal device (such as a smart phone), avoiding the increase in the thickness of the terminal device due to the increase in the number of groups and the number of lenses of the optical zoom camera module, and also avoiding the increase in the thickness of the terminal device due to reserving the moving stroke of the lens group for optical zoom. Therefore, the periscope design of this embodiment helps to miniaturize the terminal device.

[0064] Further, in an embodiment of the present invention, during active calibration, the measured optical performance values of each movable lens group within its entire stroke are used as evaluation indicators to determine whether the imaging quality meets the standard. Herein, the movable lens group refers to the lens group that moves under the drive of the motor carrier after assembly (such as the first lens group and / or the second lens group described above). In another embodiment, multiple positions within the stroke can be used to represent the entire stroke. For example, for each movable lens group, multiple positions within its stroke can be selected as representative positions. During the active calibration process, the measured optical performance values of these representative positions are measured to determine whether the imaging quality meets the standard. It should be noted that the above-mentioned measured optical performance values refer to the measured optical performance values of the entire optical system (such as the optical system jointly constituted by the first, second, and third lens groups).

[0065] Further, according to an embodiment of the present invention, there is also provided a corresponding method for assembling an optical zoom camera module, which includes steps S100 - S400.

[0066] Step S100: Prepare at least two camera module components separated from each other. Each of the at least two camera module components has a lens group, and at least two lens groups of the at least two camera module components are respectively fixed to different motor carriers and thus move respectively under the drive of the motor.

[0067] Step S200: Pre - position the at least two camera module components so that all the lens groups of the at least two camera module components jointly form an imaging optical system.

[0068] Step S300: Actively calibrate the at least two camera module components, wherein the relative positions of the at least three camera module components are adjusted based on the actual imaging result of the optical system.

[0069] Step S400: Bond the at least two camera module components with a glue material so that the relative positions of the at least two camera module components are maintained at the relative positions determined by the active calibration.

[0070] Further, in an embodiment, in the preparation step (i.e., step S100), among the at least two camera module components, there is a first camera module component, a second camera module component, and a third camera module component; wherein, the first camera module component includes a first lens group, the second camera module includes a second lens group, and the third camera module component includes a photosensitive component and a third lens group mounted on the photosensitive component.

[0071] Further, in one embodiment, in the preparation step (i.e., step S100), the second camera module component further includes a motor housing, a first motor carrier, and a second motor carrier, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, and the second lens group is mounted on the second motor carrier.

[0072] Further, in one embodiment, in the bonding step (i.e., step S400), the adhesive material includes a first adhesive material. The first adhesive material is disposed between the first camera module component and the first motor carrier, and then the first adhesive material is cured. The cured first adhesive material fixes and supports the first camera module component and the first motor carrier so that their relative positions are maintained at the relative positions determined by the active calibration.

[0073] Further, in one embodiment, in the bonding step (i.e., step S400), the adhesive material further includes a second adhesive material. The second adhesive material is disposed between the photosensitive component and the motor housing, and then the second adhesive material is cured. The cured second adhesive material fixes and supports the photosensitive component and the motor housing so that their relative positions are maintained at the relative positions determined by the active calibration.

[0074] According to another embodiment of the present invention, in the preparation step (i.e., step S100), the at least two camera module components include a first camera module component and a second camera module component; the first camera module component includes an upper subgroup of the first lens group, and the second camera module includes a lower subgroup of the first lens group, a second lens group, a motor housing, a first motor carrier, and a second motor carrier, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, the lower subgroup of the first lens is mounted on the first motor carrier, and the second lens group is mounted on the second motor carrier. In the bonding step (i.e., step S400), the adhesive material includes a first adhesive material. The first adhesive material is disposed between the upper subgroup of the first lens group and the lower subgroup of the first lens group, and then the first adhesive material is cured. The cured first adhesive material fixes and supports the upper subgroup of the first lens group and the lower subgroup of the first lens group so that their relative positions are maintained at the relative positions determined by the active calibration.

[0075] Further, in one embodiment, in the preparation step (i.e., step S100), the second camera module component further includes a third lens group fixed to the motor housing. In other words, in this embodiment, the third lens group is separated from the photosensitive component before active calibration. In this embodiment, an optical zoom lens can be assembled by active calibration, and then the optical zoom lens is bonded to the photosensitive component to obtain an optical zoom camera module.

[0076] Further, in one embodiment, the at least two camera module components further include a third camera module component, which includes a photosensitive component and a third lens group mounted on the photosensitive component. In other words, in this embodiment, the third lens group has been combined with the photosensitive component before active calibration to form the third camera module component. The third camera module component can participate in active calibration as an integrally position-adjustable component. After the first, second, and third camera module components are assembled, an optical zoom camera module can be directly obtained.

[0077] Further, in one embodiment, in the pre-positioning step (i.e., step S200) and the active calibration step (i.e., step S300), the second camera module component is fixed, and the first camera module component and the third camera module component are clamped and moved with a fixture (or other picking devices, such as an adsorption device) for pre-positioning and active calibration. Generally, the second camera module component is located in the middle. Fixing the camera module component in the middle and moving the camera module components above and below helps with the arrangement of the fixture and its driving mechanism, prevents interference between devices, and helps improve the production yield of the camera module. It should be noted that the method for assembling the camera module of the present invention is not limited to the above embodiments. For example, in another embodiment, the second camera module component can be position-adjustable (i.e., can make multi-degree-of-freedom movements during pre-positioning and active calibration).

[0078] Further, in one embodiment, in the active calibration step (i.e., step S300), when the imaging quality of the optical system still fails to meet the standard after attempting active calibration, the first camera module component, the second camera module component, or the third camera module component is replaced. After replacing the first camera module component, the second camera module component, or the third camera module component, the method for assembling the optical zoom camera module further includes: pairing the replaced first camera module component, second camera module component, or third camera module component with other camera module components to assemble an optical zoom camera module with qualified imaging quality. In this embodiment, during assembly, the relative positions between groups are adjusted and determined according to the measured values of optical performance (such as the actual resolution of the image, e.g., clarity, etc.). For the incoming materials that cannot be adjusted to meet the performance standards, only a single group can be discarded, or the replaced group can be assembled with other groups (in the case of seeking deviation cancellation between groups), so the production cost can be reduced.

[0079] Further, in one embodiment, the active calibration step (i.e., step S300) further includes: obtaining an actual measured value of the optical performance of the optical system based on the actual imaging result within the entire travel of each of the at least two movable lens groups; or obtaining an actual measured value of the optical performance of the optical system based on the actual imaging result at a plurality of representative positions representing the entire travel of each of the at least two movable lens groups.

[0080] The active calibration process used in the optical lens or camera module assembly method will be further introduced below. Since lens groups are included in the camera module components described in this article, the camera module components can also be referred to as lens components. In the present invention, during the assembly of an optical zoom lens or an optical zoom camera module, the active calibration between the first lens component and the second lens component (or the first camera module and the second camera module), and the active calibration between the second lens component and the third lens component (or the second camera module and the third camera module) 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.

[0081] 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 6A FIG. shows the relative position adjustment method in the active calibration in one embodiment of the present invention. 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 (i.e., 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.

[0082] Figure 6B FIG. shows the rotational adjustment in the active calibration of another embodiment of the present invention. In this embodiment, in addition to having Figure 6A the three degrees of freedom, a rotational degree of freedom, i.e., 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, i.e., a rotation around an axis perpendicular to the adjustment plane P.

[0083] Further, Figure 6CThe relative position adjustment method in the active calibration of another embodiment of the present invention is shown, which adds the adjustment in the v and w directions. Among them, the v direction represents the rotation angle in the xoz plane, the w direction represents the rotation angle in the yoz plane, and the rotation angles in the v and w directions can be combined into a vector angle, which represents the overall tilt state. That is to say, by adjusting in the v and w directions, the tilt posture 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).

[0084] The adjustment 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 resolution). In other embodiments of the present invention, the relative position adjustment method may be to adjust only any one of the above six degrees of freedom, or a combination of any two or more of them.

[0085] Further, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component includes translation on the adjustment plane, that is, movement in the x and y directions.

[0086] Further, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component further includes: 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, that is, the 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.

[0087] Further, in one embodiment, in the active calibration step, the adjustment of the relative position of the first lens component and the second lens component further includes: moving the first lens component along the direction perpendicular to the adjustment plane (that is, the 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.

[0088] 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 performed first so that there is a gap between the bottom surface of the first lens and the top surface of the second lens component; then active calibration is performed, and then the adhesive material is arranged 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.

[0089] In one embodiment, in the active calibration step, the second lens component can be fixed, and the first lens component can be 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 between the first lens component and the second lens component under the above six degrees of freedom. Among them, the fixture can 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.

[0090] It should be noted that, in one embodiment, when the first lens component includes a first motor housing, the fixture can rest on the outer side surface of the first motor housing.

[0091] In another embodiment, when the first lens component includes a first motor housing, the fixture for clamping the first lens component can include two sub-fixtures. The first motor housing and the first lens group are respectively clamped by these two sub-fixtures, and the relative positions of the first motor housing and the first lens group are kept unchanged during the pre-positioning and active calibration processes. Here, clamping the first lens group can be directly clamping the first lens group, or clamping the first lens group by clamping the first motor carrier, or clamping the first lens group by clamping the first lens barrel. Further, when other lens components include a motor housing, the corresponding fixture (or a multi-degree-of-freedom stage with an adsorption device) can also include two sub-fixtures (or two other types of fixing devices, such as adsorption devices) to keep the relative positions of the lens component and the motor housing unchanged during the pre-positioning and active calibration processes. It should be noted that in this embodiment, the lens component can also be regarded as a component of the imaging module. The motor housings of different imaging module components can be either independent or shared.

[0092] 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 of the third imaging module 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.

[0093] The above description is only a preferred embodiment of the present application and an 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, a technical solution formed by mutually replacing the above features with the (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. Optical zoom camera module, Characterized in that, Comprising: At least two camera module components and a glue material located between the at least two camera module components; each of the at least two camera module components respectively has at least one lens group, each lens group includes at least one lens, and all the lens groups of the at least two camera module components together constitute an imaging optical system, and at least two of the lens groups are movable lens groups, and at least two of the movable lens groups are respectively fixed to different motor carriers and move respectively under the drive of a motor; Wherein, the cured glue material fixes and supports the at least two camera module components, so that the relative positions of the at least two camera module components are maintained at the relative positions determined by active calibration, wherein the active calibration is to adjust the relative positions of the at least two camera module components based on the actual imaging result of the optical system; The at least two camera module components include a second camera module component, and the second camera module component includes a motor housing, a first motor carrier, a second motor carrier and a second lens group, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, and the second lens group is mounted on the second motor carrier; The at least two camera module components further include a first camera module component, which includes a first lens group; The glue material includes a first glue material, and the first glue material is located between the first camera module component and the first motor carrier, and after the first glue material is cured, it fixes and supports the first camera module component and the first motor carrier so that their relative positions are maintained at the relative positions determined by the active calibration, wherein the axis of the first camera module component and the axis of the first motor carrier have a non-zero included angle.

2. The optical zoom camera module according to claim 1, Characterized in that, The at least two camera module components further include a third camera module component, which includes a photosensitive component and a third lens group mounted on the photosensitive component.

3. The optical zoom camera module according to claim 2, Characterized in that, The glue material further includes a second glue material, and the second glue material is located between the photosensitive component and the motor housing, and after the second glue material is cured, it fixes and supports the photosensitive component and the motor housing so that their relative positions are maintained at the relative positions determined by the active calibration, wherein the axis of the photosensitive component and the axis of the motor housing have a non-zero included angle.

4. The optical zoom camera module according to claim 1, Characterized in that, The second camera module component further includes a third lens group, and the third lens group is fixed to the motor housing.

5. The optical zoom camera module according to claim 1, Characterized in that, The first motor carrier is driven by an electromagnetic drive module or a piezoelectric drive module, and the second motor carrier is driven by an electromagnetic drive module or a piezoelectric drive module.

6. The optical zoom camera module according to claim 1, Characterized in that, The first motor carrier and / or the second motor carrier are movably connected as described above by means of a shrapnel; or the first motor carrier and / or the second motor carrier are movably connected by the combination of a ball and a movement guide.

7. The optical zoom camera module according to claim 1, wherein, The actual imaging result of the optical system is: within the entire stroke of the at least two movable lens groups, the measured optical performance value of the optical system based on the actual imaging result; Or: at a plurality of representative positions representing the entire stroke of the at least two movable lens groups, the measured optical performance value of the optical system based on the actual imaging result.

8. An optical zoom camera module assembly method, wherein, comprising: A preparation step of preparing at least two camera module components separated from each other, each of the at least two camera module components having at least one lens group, at least two of the lens groups of the at least two camera module components being movable lens groups, and at least two of the movable lens groups being respectively fixed to different motor carriers so as to move respectively under the drive of a motor; A pre-positioning step of pre-positioning the at least two camera module components so that all the lens groups of the at least two camera module components together form an imaging optical system; An active calibration step of actively calibrating the at least two camera module components, wherein the relative positions of the at least two camera module components are adjusted based on the actual imaging result of the optical system; and An adhesion step of adhering the at least two camera module components by an adhesive so that the relative positions of the at least two camera module components are maintained at the relative positions determined by the active calibration; In the preparation step, the at least two camera module components include a first camera module component and a second camera module component; wherein, the first camera module component includes a first lens group, and the second camera module includes a second lens group, a motor housing, a first motor carrier and a second motor carrier, wherein the first motor carrier and the second motor carrier are respectively movably connected to the motor housing, and the second lens group is mounted on the second motor carrier; In the adhesion step, the adhesive includes a first adhesive, the first adhesive is disposed between the first camera module component and the first motor carrier, and then the first adhesive is cured, and the cured first adhesive fixes and supports the first camera module component and the first motor carrier so that their relative positions are maintained at the relative positions determined by the active calibration.

9. The optical zoom camera module assembly method according to claim 8, wherein, In the preparation step, the second camera module component further includes a third lens group fixed to the motor housing.

10. The optical zoom camera module assembly method according to claim 8, wherein, In the preparation step, the at least two camera module components further include a third camera module component, which includes a photosensitive component and a third lens group mounted on the photosensitive component.

11. The method for assembling an optical zoom camera module according to claim 10, wherein, in the bonding step, the adhesive material further includes a second adhesive material. The second adhesive material is disposed between the photosensitive component and the motor housing, and then the second adhesive material is cured. The cured second adhesive material fixes and supports the photosensitive component and the motor housing, so that their relative positions are maintained at the relative positions determined by the active calibration.

12. The method for assembling an optical zoom camera module according to claim 10, wherein, in the preparation step, the photosensitive component includes a color filter, and the third lens group is attached to the color filter.

13. The method for assembling an optical zoom camera module according to claim 10, wherein, in the active calibration step, the at least three camera module components are actively calibrated by fixing the second camera module component and moving the first camera module component and the third camera module component in multiple degrees of freedom.

14. The method for assembling an optical zoom camera module according to claim 8, wherein, the active calibration step further includes: obtaining the measured optical performance value of the optical system based on the actual imaging result within the entire stroke of the at least two movable lens groups; or obtaining the measured optical performance value of the optical system based on the actual imaging result at multiple representative positions representing the entire stroke of the at least two movable lens groups.

Images