Multi-group lens, camera module and its assembly method, electronic device

Abstract

Multi-group lens, camera module and its assembly method, electronic device, belonging to the technical field of optical devices. The multi-group lens of the present invention includes a plurality of group units; and at least one assembly structure for assembling two adjacent group units; wherein, the lenses in the group unit are made of any two or three of glass material, resin material, and glass-resin composite material, or only made of glass-resin composite material. The camera module of the present invention includes the above multi-group lens. The electronic device of the present invention includes the above camera module. The present invention is simple to assemble and calibrate, and has excellent performance with high imaging pixels, small TTL, etc., providing a high user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical devices, and particularly relates to a multi-group lens, an imaging module, an assembling method thereof, and an electronic device. Background Art

[0002] A lens is an important component of an imaging module and directly affects the imaging quality of the imaging module.

[0003] In a traditional optical lens, multiple lenses are assembled in the same lens barrel, and the relative positions between the lenses are basically determined and cannot be adjusted. Once the lenses are assembled in the lens barrel, the quality of the lens is determined, which also requires a high processing accuracy for the lens barrel and the lenses. An optical lens is an independently assembled component, which includes structures such as a lens barrel (including a diaphragm), lenses, spacer rings, retaining rings, etc. After the lenses leave the factory, there are certain tolerances for themselves, and the tolerances of each lens are different. And during assembly, the spacer rings and lenses are loaded into the lens barrel in sequence, and the last lens is fixed with glue or a retaining ring to complete the assembly of the lens. This assembly method also has tolerances, which include the assembly tolerance between the lens and the spacer ring, and the assembly tolerance between the lens and the lens barrel. The tolerance chain of this assembly method is too long, the assembly cost is high, the assembly position accuracy of the lenses is relatively poor, and combined with the tolerances of the lenses themselves, it will greatly affect the quality of the optical lens, and further affect the quality of the entire imaging module and the products using it.

[0004] Among them, the quality requirements for the lenses used for imaging are extremely high, and their materials are resin, optical glass, or glass-resin composite materials. Generally, the density of glass is greater than that of resin, so the reflectivity of the former is greater than that of the latter. Therefore, the requirements for the anti-reflection coating process on glass are much higher than those on resin. Similarly, during assembly and calibration, the difficulty of calibration and assembly accuracy of the former is greater than that of the latter. When ordinary glass lenses reflect about 10% of the light, the actual light transmittance is only 90%. While the reflectivity of resin is lower than that of glass. When resin lenses reflect about 8% of the light, the actual light transmittance is 92%. Then the light transmittance of resin is higher than that of glass, and the light transmittance problem can be solved after glass is coated. In addition, the refractive index and Abbe number of glass have a wider range than those of resin. Glass lenses can be made very thin, making the TTL (Total Track Length) of the optical lens smaller, which will reduce the thickness of the entire imaging module and the thickness of the electronic device equipped with the imaging module. However, with the increasing requirement for high pixel imaging, the number of lenses also increases, such as reaching five, six, etc., and the cost also increases accordingly. If all glass lenses are used, the cost is much higher than that of using resin lenses.

[0005] The camera module includes an optical lens and a photosensitive component containing a photosensitive chip. The lens is arranged on the photosensitive path of the photosensitive chip, and the light reflected by the object can enter the interior of the camera module from the lens and be received by the photosensitive chip for photoelectric conversion. Thus, the camera module can obtain an image related to the object subsequently. The optical lens is generally made by encapsulating multiple lenses overlapping each other. The position of the central axis of each lens will affect the central axis of the optical lens as a whole set of lenses. The most ideal situation is that the central axes of each lens coincide. However, due to the limitations of the lens itself tolerance, packaging process, and manufacturing process, there will be certain deviations in the central axes of each lens. In addition, during the process of setting the lens in the lens by means of bonding medium or welding, the bonding medium and welding material will also affect the position and inclination of each lens, resulting in a large deviation in the central axis of the packaged optical lens, which will inevitably affect the imaging quality of the camera module, and it is very difficult to control and guarantee the product yield of the camera module.

[0006] When assembling the camera module, active alignment (AA) is generally used to ensure that the overall central axes of the lens and the photosensitive chip and other components of the camera module are relatively consistent within the allowable deviation range. Considering the above existing problems, which are limited by the lens material, packaging, and manufacturing processes, it is very difficult to actively adjust the traditional lens and the photosensitive component, the photosensitive component and the adjustable optical element such as the diaphragm. Moreover, as the number of lenses increases, the accuracy requirements, assembly difficulty, and calibration difficulty of the optical lens and the camera module become higher and higher.

[0007] The invention patent application CN103163582A discloses a glass lens and a lens module using the glass lens, and specifically discloses that the lens module includes a lens barrel and at least one glass lens accommodated in the lens barrel. The glass lens includes an object side and an image side opposite to the object side. The light projected onto the object side is projected out from the image side after being converged or diverged by the glass. The glass lens is made of a material that can absorb infrared light to absorb the infrared light in the light passing through the glass lens. Although the invention patent application uses a glass lens, it only improves the problem that the existing lens module has an increased lens volume and a higher production cost due to the existence of a filter. The addition of a filter is omitted by using a glass that can filter out infrared light. And this application sets the glass lens in a traditional lens barrel, still having problems such as large assembly tolerance, complex assembly and calibration processes of the lens and the camera module, high technical difficulty, time-consuming, and high cost. It does not solve the problems of high processing requirements, high calibration and assembly accuracy requirements caused by the large reflectivity and low transmittance of the glass, nor does it make improvements in the adaptive assembly and calibration of the lens and the camera module containing the glass lens.

[0008] The invention patent application CN101231380A discloses a camera lens, a camera device, and a portable terminal. Specifically, the camera lens includes multiple lenses. Among the multiple lenses, the lens with the largest positive refractive power is a glass lens formed of a glass material, and the other lenses are resin lenses made of a hardened resin material. Although this application uses both glass and resin as lens materials, it reduces the cost to a certain extent. Moreover, by mainly using a hardened resin material with excellent heat resistance, the lens has the characteristics of heat resistance to the reflow process and a smaller change in the image point position during temperature changes. However, it does not solve the problems involved in the invention patent application CN103163582A either.

[0009] Currently, the precision of glass lenses is lower than that of resin lenses. Especially for the production of high-precision glass for medium and high-grade lenses, it is very difficult and is the key point of the development of the lens industry. The improvement of the precision of existing glass lenses is achieved through the improvement of processing technology. For example, the Chinese patent application CN103128516A discloses a high-precision batch manufacturing technology for aspherical glass lenses, and proposes a new type of aspherical glass lens hot embossing molding technology based on a Ni-P, Ni-Co composite layer mold. Although this invention application improves the precision of glass from the manufacturing technology, when it is subsequently assembled and used on a lens, such as when combined with resin glass or glass resin composite glass, the precision problems of each lens itself, the precision problems between each lens, and the precision problems of encapsulation remain unsolved.

[0010] The applicant's prior invention application CN105445885A discloses an adjustable optical lens, a camera module, and a manufacturing method thereof. Specifically, the adjustable optical lens includes an optical structural member and at least two optical lenses. Each of the optical lenses is disposed in the internal space of the optical structural member along the height direction of the optical member, and the spatial position of at least one of the optical lenses in the internal space of the optical structural member is adapted to be adjusted. Although the applicant has improved the problems of non-adjustable lenses in traditional lenses and the low processing, encapsulation quality, and imaging quality caused by the integrated structure of the lens. By adjusting one lens or a group of lenses in the lens, after assembly, the module can adjust at least one of the horizontal, vertical, inclined, and rotational directions of the movable part of the lens to achieve the purpose of adjusting the optical path of the lens. However, how to better adjust the lens and how to fix it after adjustment to ensure good imaging quality under the condition of simple assembly and low cost of the camera module have become urgent problems to be solved in the field of camera modules. Summary of the Invention

[0011] The object of the present invention is to provide an optical lens, a camera module, an assembly method thereof, and an electronic device that take into account cost, are simple in assembly and calibration, and have high-performance user experiences such as high pixel imaging and small TTL.

[0012] For the above purposes, the present invention provides a multi-group lens,

[0013] including a plurality of group units; and

[0014] at least one assembly structure for assembling two adjacent group units;

[0015] wherein, the lenses in the group unit are made of any two or three of glass material, resin material, and glass-resin composite material.

[0016] As a preference of the present invention, the group unit closest to the object side includes at least one glass lens or glass-resin composite lens.

[0017] As a preference of the present invention, the lens closest to the object side in the group unit closest to the object side is a glass lens or a glass-resin composite lens.

[0018] As a preference of the present invention, the group unit closest to the image side includes at least one glass lens or glass-resin composite lens.

[0019] As a preference of the present invention, the assembly structure is an independent component independent of the group unit.

[0020] As a preference of the present invention, for two adjacent group units, the group unit closer to the object side is the upper group unit, which includes an upper lens group and an upper bearing member, and the upper lens group is disposed on the upper bearing member;

[0021] The group unit closer to the image side of two adjacent group units is the lower group unit, which includes a lower lens group and a lower bearing member, and the lower lens group is disposed on the lower bearing member;

[0022] The upper bearing member is assembled to the lower bearing member through the assembly structure.

[0023] As a preference of the present invention, the upper bearing member includes:

[0024] an upper bearing main body, on which the upper lens group is disposed; and

[0025] an upper extension part extending outward from the upper bearing main body;

[0026] The lower bearing member includes:

[0027] a lower bearing main body, on which the lower lens group is disposed;

[0028] a lower inner extension part extending inward from the lower bearing main body; and

[0029] a lower overlapping part disposed on the lower bearing main body;

[0030] Among them, the lower overlapping part, the upper extension part, and the lower inner extension part cooperate to form an assembly structure; when the upper extension part overlaps the lower overlapping part, the lower inner extension part extends into the upper bearing body and is restricted by the upper group unit.

[0031] Preferably in the present invention, the upper extension part includes an upper extension portion extending towards the lower group unit.

[0032] Preferably in the present invention, the upper bearing body has an upper bearing body mating groove; the upper extension part includes an upper extension portion extending towards the lower group unit and an upper mating groove; the upper bearing body mating groove and the upper mating groove communicate with each other in the extending direction of the upper extension part.

[0033] Preferably in the present invention, an adjustment gap is left between the upper group unit and the lower inner extension part.

[0034] Preferably in the present invention, the adjustment gap between the upper group unit and the lower inner extension part is 0.1% - 300% of the thinnest thickness of the lens.

[0035] Preferably in the present invention, an adjustment gap is left between the upper extension part and the lower inner extension part.

[0036] Preferably in the present invention, the adjustment gap between the upper extension part and the lower inner extension part is 0.1% - 300% of the thinnest thickness of the lens.

[0037] Preferably in the present invention, an adjustment gap is left between the upper extension portion and the lower overlapping part.

[0038] Preferably in the present invention, the adjustment gap between the upper extension portion and the lower overlapping part is 0.1% - 300% of the thinnest thickness of the lens.

[0039] Preferably in the present invention, the lower overlapping part is provided with a lower mating groove for accommodating one or more of a bonding medium, a welding medium, and the assembly structure.

[0040] Preferably in the present invention, the overlapping part of the upper extension part and the lower overlapping part axially covers part of the lower mating groove in the lens.

[0041] Preferably in the present invention, the top of the lower overlapping part is flush with the top of the lower mating groove.

[0042] Preferably in the present invention, the lower overlapping part includes a lower extension portion extending towards the upper group unit.

[0043] Preferably in the present invention, an adjustment gap exists between the lower extension portion and the upper extension part.

[0044] Preferably in the present invention, the adjustment gap between the lower extension part and the upper extension part is 0.1% - 300% of the thinnest thickness of the lens.

[0045] Preferably in the present invention, the free end of the lower extension part extends to be at most flush with the uppermost end of the lens.

[0046] Preferably in the present invention, the free end of the lower extension part extends to be at least flush with the free end of the upper bearing body.

[0047] Preferably in the present invention, the lower overlapping part is provided with a lower fitting groove located between the lower extension part and the lower inner extension part.

[0048] Preferably in the present invention, at least a part of the inner side surface of the lower extension part near its upper end surface is an inclined surface.

[0049] Preferably in the present invention, the lower extension part and the upper extension part are assembled and fitted through a bonding medium and / or a welding medium.

[0050] Preferably in the present invention, the bonding medium is one or more of UV glue, thermosetting glue, UV thermosetting glue, epoxy resin glue, moisture-curing glue, and pressure-sensitive glue.

[0051] Preferably in the present invention, the upper bearing component includes:

[0052] an upper bearing body, and the upper lens group is arranged on the upper bearing body;

[0053] The lower bearing component includes:

[0054] a lower bearing body, and the lower lens group is arranged on the lower bearing body;

[0055] a lower inner extension part, which extends inwards from the lower bearing body; and

[0056] a lower overlapping part, which is arranged on the lower bearing body,

[0057] wherein, the lower overlapping part and the lower inner extension part cooperate to form an assembly structure; when the upper bearing body overlaps on the lower overlapping part, the lower inner extension part extends into the upper bearing body and is restricted by the upper group unit.

[0058] Preferably in the present invention, the lower overlapping part is provided with a lower fitting groove for accommodating one or more of a bonding medium, a welding medium, and the assembly structure.

[0059] Preferably in the present invention, the top of the lower overlapping part is flush with the top of the lower fitting groove.

[0060] Preferably in the present invention, the lower overlapping portion includes a lower extension portion extending towards the upper group unit.

[0061] Preferably in the present invention, there is an adjustment gap between the lower extension portion and the upper carrying body.

[0062] Preferably in the present invention, the adjustment gap between the lower extension portion and the upper carrying body is 0.1% - 300% of the thinnest thickness of the lens.

[0063] Preferably in the present invention, the free end of the lower extension portion extends to be at most flush with the uppermost end of the lens.

[0064] Preferably in the present invention, the free end of the lower extension portion extends to be at least flush with the free end of the upper carrying body.

[0065] Preferably in the present invention, the lower overlapping portion is provided with a lower fitting groove located between the lower extension portion and the lower inner extension portion.

[0066] Preferably in the present invention, at least a part of the inner side surface of the lower extension portion, at least near its upper end surface, is an inclined surface.

[0067] Preferably in the present invention, there is an adjustment gap between the upper group unit and the lower inner extension portion.

[0068] Preferably in the present invention, the adjustment gap between the upper group unit and the lower inner extension portion is 0.1% - 300% of the thinnest thickness of the lens.

[0069] Preferably in the present invention, the bonding medium is one or more of UV glue, thermosetting glue, UV thermosetting glue, epoxy resin glue, moisture-curing glue, and pressure-sensitive glue.

[0070] Preferably in the present invention, at least one of the group units includes at least one spacer ring.

[0071] Preferably in the present invention, adjacent group units are assembled by an active calibration method.

[0072] The present invention also provides an assembly method for a multi-group lens for assembling the above multi-group lens, including the following steps:

[0073] Step S01, assembling the group units;

[0074] Step S02, determining the relative positions of adjacent group units by an active calibration method; and

[0075] Step S03, fixing the group units to form a multi-group lens.

[0076] The present invention also provides an imaging module, which includes the multi-group lens as described above and a photosensitive component, wherein the multi-group lens is located in the photosensitive path of the photosensitive component.

[0077] Preferably, the imaging module further includes a driving element, and the multi-group lens is disposed on the driving element.

[0078] The present invention also provides an assembling method for an imaging module for assembling the above imaging module, including the following steps:

[0079] Step S11: Assemble at least one group unit and a driving element to obtain a driving lens assembly;

[0080] Step S12: Assemble the driving lens assembly on the photosensitive component;

[0081] Step S13: Assemble other group units on the driving lens assembly to form an imaging module.

[0082] Preferably, step S12 is performed by an active calibration method for assembly.

[0083] Preferably, step S13 is performed by an active calibration method for assembly.

[0084] The present invention also provides an assembling method for an imaging module for assembling the above imaging module, including the following steps:

[0085] Step S11': Assemble all group units to obtain a multi-group lens;

[0086] Step S12': Assemble the multi-group lens and a driving element to obtain a driving lens assembly;

[0087] Step S13': Assemble the driving lens assembly on the photosensitive component to form an imaging module.

[0088] Preferably, step S13' is performed by an active calibration method for assembly.

[0089] The present invention also provides an electronic device, which is characterized by including the above imaging module.

[0090] The present invention has the following beneficial effects:

[0091] The multi-group lens, imaging module, its assembling method, and electronic device of the present invention are simple in assembly and adjustment, and at the same time take into account economic costs, as well as excellent performance with high imaging pixels and small TTL, etc., providing a high user experience. Description of the Drawings

[0092] Figure 1 It is a cross-sectional view of the multi-group lens in Embodiment 1 of the present invention;

[0093] Figure 2 Stereoscopic structure sectional view of the multi-group lens in Embodiment 1 of the present invention;

[0094] Figure 3 Schematic diagram of the assembly process of the upper group unit in the multi-group lens in Embodiment 1 of the present invention;

[0095] Figure 4 Schematic diagram of the assembly process of the lower group unit in the multi-group lens in Embodiment 1 of the present invention;

[0096] Figure 5 Sectional view of the multi-group lens in Embodiment 2 of the present invention;

[0097] Figure 6 Sectional view of the multi-group lens in Embodiment 3 of the present invention;

[0098] Figure 7 Sectional view of the multi-group lens in Embodiment 4 of the present invention;

[0099] Figure 8 Sectional view of the camera module of the multi-group lens according to Embodiment 1 of the present invention;

[0100] Figure 9 For Figure 8 Schematic diagram of the assembly process of the camera module in

[0101] Figure 10 Sectional view of another embodiment of the camera module of the multi-group lens according to Embodiment 1 of the present invention;

[0102] Figure 11 Sectional view of another embodiment of the camera module of the multi-group lens according to Embodiment 1 of the present invention.

[0103] 10 - Lens; 11 - Upper group unit; 111 - Upper lens group; 112 - Upper bearing member; 1121 - Upper bearing body; 1121C - Upper bearing body mating groove; 1122 - Upper extension portion; 11221 - Upper extension part; 1122C - Upper mating groove; 12 - Lower group unit; 121 - Lower lens group; 122 - Lower bearing member; 1221 - Lower bearing body; 1222 - Lower inner extension portion; 1223 - Lower overlapping portion; 1223C - Lower mating groove; 13 - Bonding medium; 14 - Spacer ring; 15 - Retaining ring; 16 - Assembly workbench surface of the upper group unit; 17 - Assembly workbench surface of the lower group unit;

[0104] 21 - Upper group unit; 211 - Upper lens group; 212 - Upper carrier member; 2121 - Upper carrier body; 2121C - Upper carrier body mating groove; 2122 - Upper extension portion; 2122Z - Free end of the upper extension portion; 21221 - Upper extension part; 2122C - Upper mating groove; 22 - Lower group unit; 221 - Lower lens group; 222 - Lower carrier member; 2221 - Lower carrier body; 2222 - Lower inner extension portion; 2223 - Lower overlapping portion; 22231 - Lower extension part; 22232 - Lower mating groove; 22231Z - Free end of the lower extension part; 22231Q - Inclined surface of the lower extension part; 23 - Bonding medium; 24 - Spacer ring; 25 - Retaining ring;

[0105] 31 - Upper group unit; 311 - Upper lens group; 312 - Upper carrier member; 3121 - Upper carrier body; 3121C - Upper carrier body mating groove; 3121Z - Free end of the upper carrier body; 3122C - Upper mating groove; 32 - Lower group unit; 321 - Lower lens group; 322 - Lower carrier member; 3221 - Lower carrier body; 3222 - Lower inner extension portion; 3223 - Lower overlapping portion; 32231 - Lower extension part; 32232 - Lower mating groove; 32231Z - Free end of the lower extension part; 32231Q - Inclined surface of the lower extension part; 33 - Bonding medium; 34 - Spacer ring; 35 - Retaining ring; 36 - Metal sheet;

[0106] 41 - Upper group unit; 411 - Upper lens group; 412 - Upper carrier member; 4121 - Upper carrier body; 4121C - Upper carrier body mating groove; Free end of the upper carrier body - 4121Z; 4122 - Upper extension portion; 41221 - Upper extension part; 4122C - Upper mating groove; 42 - Lower group unit; 421 - Lower lens group; 422 - Lower carrier member; 4221 - Lower carrier body; 4222 - Lower inner extension portion; 4223 - Lower overlapping portion; 42231 - Lower extension part; 42232 - Lower mating groove; 42231Z - Free end of the lower extension part; 42231Q - Inclined surface of the lower extension part; 43 - Bonding medium; 44 - Spacer ring; 45 - Retaining ring;

[0107] 20 - Photosensitive component; 201 - Photosensitive element; 202 - Circuit board; 203 - Base; 30 - Driving element; 40 - Filter element. Detailed implementation manners

[0108] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes, and other technical schemes that do not deviate from the spirit and scope of the present invention.

[0109] Those skilled in the art should understand that in the disclosure of the present invention, the orientation or positional relationships indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the methods or positional relationships shown in the drawings. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific direction. Therefore, the above terms should not be construed as limitations of the present invention.

[0110] In traditional optical lenses, especially those applied to camera modules, multiple lenses are encapsulated in a lens overlapping each other. When the number of lenses is small, such as two or three, the assembly error of this structure has a relatively small impact. With the requirements for high pixels and high imaging quality of lenses and camera modules, the number of lenses increases, and the assembly errors generated by encapsulation in the traditional manner accumulate. Thus, the traditional structure of optical lenses cannot meet the requirements for lenses and camera modules.

[0111] Generally, optical lenses use lenses made of resin materials. On the one hand, the refractive index and Abbe number ranges of resin lenses are lower than those of glass lenses. To obtain the same optical effect, the thickness of resin lenses is greater than that of glass lenses, and the length of the lens composed of resin lenses is greater than that of the lens composed of glass lenses. As the number of lenses increases, the difference in the lengths of the two lenses will be more significant. And the lens length TTL also has a certain impact on the thickness of the camera module and the thickness of the electronic device encapsulating the camera module. On the one hand, the weight and cost of glass lenses both exceed those of resin lenses, and the light transmittance of glass lenses is slightly worse than that of resin lenses (the light transmittance of glass lenses can be improved by coating). On the other hand, for lenses made of a new type of glass resin composite, there are still many application problems such as accuracy and optical effects in new research. How to combine the advantages and disadvantages of glass lenses and resin lenses, or resin lenses and glass resin composite lenses, or glass resin composite lenses and glass lenses, or glass lenses, resin lenses, and glass resin composite lenses to obtain an optical lens, camera module, and electronic device with high-quality imaging, high pixel requirements, and accurate and convenient calibration is what the present invention aims to achieve.

[0112] Considering the differences in the optical characteristics of glass, resin, and glass-resin composite lenses, their calibration is adaptively adjusted according to different optical characteristics. If both glass lenses and resin lenses or glass-resin composite lenses are provided in a traditional optical lens, since the lenses in the traditional lens are fixedly arranged, the overall optical consistency of the lens needs to meet the requirements before leaving the factory, so that when the camera module is calibrated after being set on the photosensitive component, its central axis can also be consistent; otherwise, once there is a deviation in the optical consistency between the lenses, there will be an accumulated deviation in the overall optical consistency of the lens, and then there will also be an accumulated deviation in the camera module, resulting in low imaging quality.

[0113] Therefore, the present invention provides a multi-group lens, which is composed of multiple independent group units. In this way, there are fewer lenses in each group unit, and the assembly error of each unit is smaller. At the same time, the total number of lenses in multiple group units is very large, which can meet the requirements of high-pixel lens lenses. In this way, during the process of assembling the multiple group units into a multi-group lens, an active calibration method can be adopted for assembly, so that the relative error between the group units is smaller, thereby enabling the multi-group lens to have better optical characteristics. The multi-group lens of the present invention further includes an assembly structure, and the assembly structure is used to assemble two adjacent group units, so that each group unit is stably assembled to form the multi-group lens, and the structure assembly restricts the stability of the lens assembly and optical characteristics. Among them, the materials of all the lenses of the multiple group units can be selected from any two or three of glass, resin, and glass-resin composite materials, or only glass-resin composite materials are used. The above assembly method also improves the calibration of lenses with different optical performances, and the convenient calibration method effectively compensates for the deviation brought by the materials.

[0114] For the convenience of description, in the following embodiments of the present invention, a multi-group lens and a camera module composed of two group units are taken as examples for description. Of course, in other embodiments of the present invention, the multi-group lens may include more group units, such as three, four, or more, and the present invention does not limit this here.

[0115] Figure 1 、 2Schematic diagram of a multi-group lens according to Embodiment 1 of the present invention. The multi-group lens includes two group units, namely an upper group unit 11 and a lower group unit 12. The definition of the upper and lower group units is not limited to the difference between the two group units. When there are three or more group units, adjacent two group units are distinguished as upper and lower group units, where the group unit closer to the object side is the upper group unit, and the group unit closer to the image side is the lower group unit. For example, when there are three first group units, second group units, and third group units, and the three group units are arranged from top to bottom in the optical axis direction; then the first group unit is the upper group unit relative to the second group unit, and the second group unit is the lower group unit relative to the first group unit; and the second group unit is the upper group unit relative to the third group unit, and the third group unit is the lower group unit relative to the second group unit. The upper group unit 11 and the lower group unit 12 are assembled in cooperation through the assembly structure, that is, adjacent two group units are assembled in cooperation through the assembly structure.

[0116] There are multiple lenses in the multi-group lens, which are distributed in each group unit in the form of lens groups. Based on the existing problems, the material of the lens can be selected from two or three of glass, resin, and glass-resin composite, or only the glass-resin composite material. Among them, the resin generally includes thermosetting resin materials and thermoplastic resin materials. The positions and numbers of the above lenses are adjusted as needed, and no limit is imposed on the number here. For example, the first group unit has one glass lens and one resin lens, the second group unit has three resin lenses, and the third group unit has one glass-resin composite lens; the number of lenses in each of the above group units is not limited, the lens materials are not limited, and the up-and-down placement positions of the lenses are not limited. In this way, the present invention can effectively adjust the optical axis consistency for lenses, camera modules, and electronic devices composed of lenses with different numbers, different positions, and different materials. Considering the lens cost, imaging effect, and wear resistance, at least one glass lens or glass-resin composite lens is provided in a group unit closer to the object side of the lens. Further, the lens closest to the object side in the group unit closer to the object side of the lens is a glass lens. Or, for special imaging effects, such as a fisheye lens with a large wide angle, at least one glass lens or glass-resin composite lens is provided in a group unit closest to the image side of the lens.

[0117] The upper group unit 11 includes an upper lens group 111 and an upper carrier member 112. The upper lens group 111 has at least one lens. The lenses in the upper lens group 111 are arranged in the upper carrier member 112 according to the optical path.

[0118] The lower group unit 12 includes a lower lens group 121 and a lower carrier member 122. The lower lens group 121 has at least one lens. The lenses in the lower lens group 121 are arranged in the lower carrier member 122 along the optical path.

[0119] Specifically, the upper carrier member 112 of the upper group unit 11 includes an upper carrier body 1121 and an upper extension portion 1122. The upper carrier body 1121 is a hollow structure, facilitating the accommodation and installation of the upper lens group 111 and arranging it along the optical path. The upper extension portion 1122 extends outward from the outside of the upper carrier body 1121 so as to overlap with the lower carrier member 122 of the lower group unit 12. Specifically, the upper extension portion 1122 may extend outward from the outside of the upper carrier body 1121 with reference to the circumferential direction of the upper carrier body 1121. The above-mentioned outward extension direction is not limited to the circumferential direction, generally referring to the outward extension away from the outside of the upper carrier body 1121.

[0120] The lower carrier member 122 of the lower group unit 12 includes a lower carrier body 1221, a lower inner extension portion 1222, and a lower overlapping portion 1223. The lower carrier body 1221 is a hollow structure, facilitating the accommodation and installation of the lower lens group 121 and arranging it along the optical path. The lower inner extension portion 1222 extends inward from the inside of the lower carrier body 1221 so as to extend into the upper carrier body 1121 and the upper extension portion 1122. Specifically, the lower inner extension portion 1222 extends inward from the inside of the lower carrier body 1221 with reference to the circumferential direction of the lower carrier body 1221. The above-mentioned inward extension direction is not limited to the circumferential direction, generally referring to the inward extension close to the inside of the lower carrier body 1221. The lower overlapping portion 1223 is provided on the lower carrier body 1221, and the upper extension portion 1122 is used to overlap with the lower overlapping portion 1223.

[0121] The lower overlapping portion 1223, the upper extension portion 1122, and the lower inner extension portion 1222 cooperate to form an assembly structure. The lower overlapping portion 1223 and the lower inner extension portion 1222 are integrally formed with the lower carrier body 1221 respectively, and the upper extension portion 1122 is integrally formed with the upper carrier body 1121. In another way, the assembly structure is an independent component independent of the group unit. The lower overlapping portion 1223 and the lower inner extension portion 1222 are separately connected to the lower carrier body 1221 respectively, and the upper extension portion 1122 is separately connected to the upper carrier body 1121. In other ways, the above structures can be set in a combined manner, including both integral formation and separate connection. Considering the assembly tolerance and stability, the former integral formation method is preferred.

[0122] The upper group unit 11 is disposed on the lower group unit 12. When the upper extension portion 1122 overlaps with the lower overlapping portion 1223, the lower inner extension portion 1222 extends into the upper bearing body 1121 and is restricted by the upper group unit. That is to say, the lower inner extension portion 1222 is restricted within the upper group unit and cannot be largely displaced in the axial direction or the circumferential direction of the lens or both of the above directions. In addition, the upper bearing body 1121 can restrict the displacement of the upper lens group 111 in the circumferential direction of the lens. The inner side of the upper bearing body 1121 has an upper bearing body mating groove 1121C to accommodate the extending lower inner extension portion 1222.

[0123] To provide a larger adjustment space between the upper group unit 11 and the lower group unit 12, and more constraints on the adjustment space in the axial direction and the circumferential direction of the lens. On the one hand, when the upper extension portion 1222 overlaps with the lower overlapping portion 1223, the lower inner extension portion 1222 extends into the space where the upper bearing body 1121 and the upper extension portion 1122 communicate with each other and is restricted by both the upper bearing body 1121 and the upper extension portion 1122. That is to say, the lower inner extension portion 1222 is restricted by both the upper bearing body 1121 and the upper extension portion 1122 in the axial direction and the circumferential direction of the lens and cannot be largely displaced. At the same time, the accommodating spaces of both provide a relatively flexible adjustment range.

[0124] On the one hand, the upper outer extension portion 1122 includes an upper extension portion 11221 extending towards the lower group unit 12. The upper extension portion 11221 overlaps with the lower overlapping portion 1223 and cooperates with the lower inner extension portion 1222 to achieve axial and circumferential constraints on the lens in terms of structure; it is also restricted by the upper extension portion 11221 of the upper outer extension portion 1122 and the upper carrier body 1121 in the axial and circumferential directions of the lens. The upper carrier body 1121 further includes an upper carrier body mating groove 1121C, which is provided inside the upper carrier body; the upper carrier body mating groove 1121C can be used for dispensing glue, mainly restricting the offset of the upper lens group in the circumferential direction of the lens. The upper outer extension portion 1122 further includes an upper mating groove 1122C. When the upper carrier body mating groove 1121C and the upper mating groove 1122C communicate with each other in the extending direction of the upper outer extension portion 1222, a relatively large space is provided for the adjustment of the upper and lower group units. Wherein the upper carrier body mating groove 1121C can also be independently provided on the upper carrier body 1121, and the upper mating groove 1122C can also be independently provided on the upper outer extension portion 1122, and the upper carrier body mating groove 1121C and the upper mating groove 1122C do not communicate with each other. In addition, the upper mating groove 1122C is not limited to being opened on the upper outer extension portion 1122. It is also possible that the upper extension portion 11221 and the upper outer extension portion 1122 are integrally formed, and when the upper extension portion 1222 extends towards the lower group unit 12, the upper mating groove 1122C is formed inside the upper outer extension portion 1122. The upper carrier body mating groove 1121C and the upper mating groove 1122C are not limited to the above-mentioned setting methods.

[0125] In order to adjust the fixed position between the upper and lower group units to obtain a high yield rate and high imaging quality. An adjustment gap is provided between the upper and lower group units. Specifically, an adjustment gap can be left between the upper carrier body 1221 and the lower inner extension portion 1222; an adjustment gap can also be left between the bottom of the lens closest to the image side of the upper group unit 11 and the lower inner extension portion 1222; an adjustment gap can also be left between the upper outer extension portion 1122 and the lower inner extension portion 1222. An adjustment gap can also be left between the upper extension portion 11221 and the lower overlapping portion 1223; it can also be a combination of two or three of the above situations and other multiple combined settings. The above-mentioned gap adjustment methods reserve gaps in terms of the relative positions of the structures, or are achieved through dimensions such as the thicknesses of various parts. The above adjustment gap is 0.1% - 300% of the thinnest thickness of the lens, approximately 2 - 600 microns.

[0126] The lower overlapping portion 1223 is further provided with a lower mating groove 1223C. The lower mating groove 1223C is used to accommodate a bonding medium, a welding medium, or the above-mentioned assembly structure. When the upper extension portion 1122 overlaps the lower overlapping portion 1223, the lower mating groove 1223C is fixedly engaged with the lower overlapping portion 1223 through the bonding medium 13, the welding medium, or the above-mentioned assembly structure to fix their relative positions after adjusting and determining the positions of the upper and lower groups. The above-mentioned lower mating groove 1223C provides a sufficient external exposure surface for the bonding medium 13 or the welding medium to a certain extent. Thus, during the process of assembling the upper and lower group units, after applying the bonding medium 13 or the welding medium into the lower mating groove 1223C, the upper group unit 11 and the lower group unit 12 are actively calibrated, and then ultraviolet light, infrared light, X-ray, laser irradiation, or gas catalysis such as water vapor, oxygen, hydrogen, etc. is performed in the area where the bonding medium 13 or the welding medium is located, so that the bonding medium is quickly pre-cured or the welding medium is quickly melted, and then the upper group unit 11 and the lower group unit 12 are further cured, thereby quickly completing the assembly of the upper group unit 11 and the lower group unit 12, reducing the assembly time, and improving the production efficiency.

[0127] To ensure sufficient light irradiation area during dispensing or sufficient exposure surface during laser welding and effective exposure. The top of the lower overlapping portion 1223 is flush with the top of the lower mating groove 1223C. Further, the portion of the upper extension portion 1122 that overlaps the lower overlapping portion 1223 covers a part of the lower mating groove 1223C in the axial direction of the lens, so that a part of the lower mating groove 1223C is exposed for receiving external processing means, such as incident light.

[0128] Reserve space for adjusting the upper and lower group units and provide sufficient overflow space for glue. To strengthen the fixation, in the space of the adjustment gap between the upper bearing body 1221 and the lower inner extension portion 1222, or in the space of the adjustment gap between the bottom of the lens closest to the image side of the upper group unit 11 and the lower inner extension portion 1222, or in the space of the adjustment gap between the lower extension portion 12231 and the upper extension portion 1122, or in the space of the adjustment gap between the upper extension portion 1122 and the lower inner extension portion 1222, or in the space of the adjustment gap between the upper extension portion 11221 and the lower overlapping portion 1223; it can also be one or two combinations or three combinations of the above situations and other multiple situations. In the space of the adjustment gap, a bonding medium (such as Figure 1 ) is provided. Or a welding medium is provided in the space of the adjustment gap between the upper extension portion 11221 and the lower overlapping portion 1223 (refer to the appendix Figure 6 ) to fix the relative positions of the upper and lower group units after adjusting and determining their positions.

[0129] The bonding medium 13 is not limited to UV glue, thermosetting glue, UV thermosetting glue, epoxy resin glue, pressure-sensitive glue, moisture-curing glue, and photo-curing glue in glue, and can be a combination of one or more of the above. The welding medium includes metal components such as metal sheets. The upper and lower group units can also be structurally constrained with each other through an assembly structure to achieve the installation of both the upper and lower group units. The connection between the upper group unit 11 and the lower group unit 12 is not limited to the above method, and can also be achieved through connection methods such as riveting, screwing, pinning, and wedging.

[0130] The consistency of the lens optical axis and the assembly time are two important aspects in the actual production and application of lenses. In the multi-group lens of the present invention, determining the relative positions between the group units is an important way to ensure the consistency of the optical axis. In the prior application of this application, when exposure is applied to the lower mating groove 1223C by an external method, front exposure is often used, that is, the light beam directly irradiates the lower mating groove 1223C vertically. However, it is actually found that the irradiation effect cannot effectively irradiate, especially the part inside the lower mating groove 1223C close to the lens axis and the inner bottom. Due to insufficient irradiation, the exposure effectiveness is low, affecting the stability and accuracy of the fixation of the upper and lower group units. The exposure method adopted by the present invention includes front exposure and side exposure. That is to say, when light irradiates the lower mating groove 1223C, for example, because the top of the lower overlapping portion 1223 is flush with the top of the lower mating groove 1223C, or because the overlapping part of the upper extension portion and the lower overlapping portion covers a part of the lower mating groove in the axial direction of the lens, etc., part of the lower mating groove 1223C receives front light and part receives side light. When the light enters the inside of the lower mating groove 1223C, especially the inner bottom, the pre-curing speed of the UV thermosetting glue is fast and the pre-curing effect is good. Therefore, the assembly method of the present invention can improve the assembly accuracy, save assembly man-hours, and is suitable for mass production.

[0131] In an embodiment of the present invention, the upper group unit 11 includes a glass lens, and the lens is disposed on an upper bearing member. The lower group unit 12 includes five resin lenses, which are arranged in the lower bearing member along the optical path from top to bottom in sequence. The upper group unit 11 includes a spacer (not shown in the figure), which is arranged in cooperation with each upper lens group 111 to constrain the light passing through the upper lens group 111, so as to facilitate providing a predetermined light path. The lower group unit 12 includes a spacer 15, which is arranged in cooperation with each lower lens group 121 to constrain the light passing through the lower lens group 121, so as to facilitate providing a predetermined light. The lower group unit has a plurality of spacers 15. In the embodiment of the present invention, there are four spacers. If the lower lens groups arranged from the object side to the image side are divided into a first lens, a second lens, a third lens, and a fourth lens, then each spacer is sequentially arranged between the first lens and the second lens, between the second lens and the third lens, and between the third lens and the fourth lens. In addition, other forms can also be used, such as being arranged on the lens in the form of a coating to replace the spacer.

[0132] As Figure 3 , the assembly process of the upper group unit 11 shown in the first embodiment of the present invention is specifically as follows: First, invert the upper bearing member 112 of the upper group unit 11 on an upper group unit assembly workbench surface 16, then assemble the first lens group 111 at a corresponding position in the upper bearing member 112, then assemble the spacer into it. If there is a retaining ring, it is also necessary to assemble the retaining ring into it. The spacers / retaining rings are sequentially arranged between the lenses. After that, apply a bonding medium at the positions where the lenses need to be bonded and fixed. Thus, the assembly of the upper group unit 11 is completed. As Figure 4 , the assembly process of the lower group unit 12 shown in the first embodiment of the present invention is carried out on a lower group unit assembly workbench 17, and this process is carried out with reference to the assembly sequence of the upper group unit in the figure.

[0133] It is worth mentioning that since the entire lens is composed of multiple group units, the number of lenses in each group unit can be relatively small, such as one, two, three, four, etc. And the number of lenses in the entire lens, that is, the multi-group lens, is obtained by adding the number of lenses in each group unit. Therefore, the number is relatively large, such as six, seven, eight, etc. Thus, a lens with a higher resolution can be provided, which is suitable for a high-pixel imaging module. And during the assembly process, through the active calibration between the group units, the optical axes of the group units can be made consistent, reducing the cumulative error of the multi-group lens and improving the imaging quality.

[0134] Figure 5The multi-group lens according to the second embodiment of the present invention is shown. The second embodiment has the features disclosed in the first embodiment. Compared with the first embodiment, in the multi-group lens of the second embodiment, the lower overlapping portion 2223 of the lower bearing member 222 of the lower group unit 22 includes a lower extending portion 22231 extending in the direction of the upper group unit 21. When the lower extending portion 22231 extends in the direction of the upper group unit 21, the lower extending portion 22231 and the lower inner extending portion 2222 cooperate to limit the upper outer extending portion of the upper bearing member 212 on both sides of the bottom of the lower overlapping portion 2223, including the bottom of the upper outer extending portion or the upper extending portion or both the bottom of the upper outer extending portion and the upper extending portion, restricting the adjustment range during the assembly of the upper and lower group units. The presence of the lower extending portion 22231 blocks part of the light. When the lower extending portion 22231 is long enough, the outward extending end of the lower extending portion 22231 is a free end, and the free end 22231Z of the lower extending portion extends to the highest distance, which is the uppermost end of the lens, that is, the free end 22231Z of the lower extending portion extends to be flush with the uppermost end of the lens. This can provide more guarantees for preventing displacement offset. In addition, due to the presence of the lower extending portion 2231, the lower fitting groove may not be provided.

[0135] Further, the free end portion 22231Z of the lower extending portion 22231 extends to at least be flush with the free end 2122Z of the upper outer extending portion. The fourth embodiment is implemented based on the second embodiment, and the difference lies in Figure 7 In the fourth embodiment shown, the free end 42231Z of the lower extending portion is flush with the free end 4122Z of the upper outer extending portion. The free end 42231Z of the lower extending portion refers to the end portion of the upper outer extending portion facing the lower group unit 22. This ensures that the lower extending portion 22231 has a certain height, so that the lower extending portion 22231 has a certain degree of displacement limitation on the upper outer extending portion 2122 overlapping the lower overlapping portion 2223, provides guarantee for the stability of the assembly, and reduces the large-range deflection of the axis during assembly to a certain extent, which is beneficial to active calibration.

[0136] Under the adjustment gap as in Embodiment 1, an adjustment gap can also be provided between the lower extending portion 22231 and the upper outer extending portion 2122. The bonding medium 23 / welding medium can be placed in the space where the adjustment gap is located. To ensure the effective exposure of the bonding medium / welding medium, if the incident light is relatively large, the inner side surface of the lower extending portion is an inclined surface as a whole, or part of it is an inclined surface (such as Figure 7 shown in the fourth embodiment), that is, at least part of it near its upper end surface is an inclined surface. The inclination direction of this inclined surface is inclined from the top of the lower extending portion 22231 towards the direction close to the lens axis to the bottom of the lower extending portion 22231, or to a certain part of the lower extending portion 22231. In addition, due to the presence of the lower extending portion 2231, the lower fitting groove in the fourth embodiment may not be provided.

[0137] Figure 6 The multi-group lens according to the third embodiment of the present invention is shown. The biggest difference between the third embodiment and the first embodiment is that the upper bearing member 312 includes an upper bearing body 31121. The upper lens group 111 is disposed on the upper bearing body 31121. The lower bearing member 322 includes a lower bearing body 3221, a lower inner extension 3222, and a lower overlapping portion 3223. The lower lens group 321 is disposed on the lower bearing body 3221. The lower inner extension 3222 extends inward from the lower bearing body 31121. The lower overlapping portion 3223 is disposed on the lower bearing body 3221. The lower overlapping portion 3223 and the lower inner extension 3222 cooperate to form an assembly structure. When the upper bearing body 3221 overlaps the lower overlapping portion 3223, the lower inner extension 3222 extends into the upper bearing body 3221 and is restricted by the upper bearing body 3221. As can be seen from the figure, in the case of the third embodiment, the lower fitting groove 3223C can be maximally exposed to the external environment, which helps with effective exposure. Other contents disclosed in the third embodiment, such as the dispensing method, adjustment gap, etc., are the same as those disclosed in the first embodiment and will not be elaborated here. At the same time, the multi-group lens of the third embodiment also has the content related to the lower extension portion 32231 in the second embodiment.

[0138] The free end 32231Z of the lower extension portion 32231 extends to at least be flush with the free end 3122Z of the upper bearing body. When the free end 32231Z of the lower extension portion is flush with the free end 3122Z of the upper bearing body, the space between the two accommodates the bonding medium or welding medium, and the relative assembly positions of the two can be adjusted. However, the lower extension portion 32231 is not high enough. Specifically, the height difference between the free end 32231Z of the lower extension portion 32231 and the free end 3122Z of the upper bearing body is not large enough to effectively achieve the circumferential constraint of the lower extension portion 32231 and the upper bearing body 3122 in the lens circumferential direction. Figure 6 In the third embodiment, it is shown that the free end 32231Z of the lower extension portion is higher than the free end 3121Z of the upper bearing body. The free end 3121Z of the upper bearing body refers to the end of the free end of the upper bearing body facing the lower group unit 32. This ensures that the lower extension portion 32231 has a certain height, so that the lower extension portion 32231 has a certain degree of displacement limitation on the upper bearing body 3121 overlapping the lower overlapping portion 3223, provides guarantee for the stability of the assembly, and to a certain extent reduces the large-range deflection of the axis during assembly, which is beneficial for active calibration.

[0139] The lower overlapping portion 3223 is provided with a lower fitting groove 3223C located between the lower extension portion 32231 and the lower inner extension 3222. The lower fitting groove 3223C can accommodate the bonding medium or welding medium.

[0140] Figure 8 The figure shows an imaging module composed of a multi-group lens 10 according to Embodiment 1 of the present invention. Taking the imaging module equipped with the multi-group lens of Embodiment 1 as an example, the present invention is described by way of example. The imaging module may be equipped with the multi-group lenses of Embodiment 2, Embodiment 3, Embodiment 4, and the above-described various modified embodiments. The imaging module may be an autofocus imaging module, which includes a multi-group lens 10, a photosensitive component 20, and a driving element 30. The multi-group lens 10 is located on the light-sensing path of the photosensitive component 20 so that the photosensitive component 20 can sense light to obtain image information. The multi-group lens 10 is mounted on the driving element to facilitate adjusting the focal length of the imaging module by adjusting the multi-group lens 10. The driving element 30 is, by way of example but not limited to, a voice coil motor, a piezoelectric motor, etc. The driving element 30 is electrically connected to the photosensitive component 20.

[0141] The photosensitive component 20 includes a photosensitive element 201, a circuit board 202, and a base 203. The photosensitive element 201 is electrically connected to the circuit board 202, for example, is disposed on the circuit board 202 by surface mounting and is electrically connected to the circuit board 202 through an electrical connection line. The base 203 is mounted on the circuit board 202. The driving element 30 is mounted on the base 203, and makes the multi-group lens 10 located on the light-sensing path of the photosensitive element 201, and makes the central optical axes of the multi-group lens 10 and the photosensitive element 201 coincide.

[0142] The imaging module may further include a filter element 40. The filter element 40 is mounted on the base 203 and is located between the multi-group lens 10 and the photosensitive element 201. That is to say, the light entering from the multi-group lens 10 reaches the photosensitive element 201 after passing through the filtering action of the filter element 40. The filter element 40 is, by way of example but not limited to, an infrared cut-off filter, a blue glass filter.

[0143] The base is molded, and is not limited to Figure 8 the shown structure. On the premise of realizing the above functions, the base structure can be deformed feasibly. For example, it can also be designed into Figure 10 , 11 the base structure shown.

[0144] Figure 9 The figure shows Figure 8The assembly method of the camera module. On the basis of assembling or obtaining the upper group unit 11 and the lower group unit 12, first, the photosensitive element 201, the circuit board 202, the base 203, and the filter element 40 are assembled to obtain the photosensitive assembly 20, and the lower group unit 12 is assembled to the driving element 30 to form a driving lens assembly. Then, the driving lens assembly is assembled to the photosensitive assembly. Then, the upper group unit 11 is assembled to the lower group unit 12, and active calibration is performed to make the optical axis of the multi-group lens 10 coincide with the central optical axis of the photosensitive element 201. Finally, the upper group unit 11 is fixed to obtain the camera module.

[0145] It is worth mentioning that during the assembly of the lens driving assembly and the photosensitive assembly 20, preferably, the assembly error between the lens driving assembly and the photosensitive assembly 20 is small or within a predetermined range to ensure that a camera module with better quality can be obtained during subsequent assembly, such as during active calibration. Of course, when assembling the lens driving assembly and the photosensitive assembly 20, assembly can also be carried out by means of active calibration to provide a good assembly basis. In addition, when assembling the lens driving assembly and the photosensitive assembly 20, assembly can also be carried out by the VA (VAM Attach) method to make the assembly error within a predetermined range.

[0146] The camera module can also be assembled in another way (not shown in the figure): On the basis of assembling or obtaining the upper group unit 11 and the lower group unit 12, the upper group unit 11 and the lower group unit 12 are assembled to obtain the multi-group lens 10. The multi-group lens and the driving element 30 are assembled to obtain the driving lens assembly, and the photosensitive element 201, the circuit board 202, the base 203, and the filter element 40 are assembled to obtain the photosensitive assembly 20. Then, the driving lens assembly is assembled to the photosensitive assembly 20 to obtain the camera module.

[0147] When assembling the driving lens assembly and the photosensitive assembly 20, assembly can be carried out by means of active calibration.

[0148] In addition, the camera module may also be a fixed-focus camera module (not shown in the figure), including a multi-group lens and a photosensitive component. The photosensitive component includes a photosensitive element, a circuit board, and a base. The photosensitive element is electrically connected to the circuit board and is electrically connected to the circuit board through an electrical connection line. The base is mounted on the circuit board. The driving element is mounted on the base, and the multi-group lens is located on the photosensitive path of the photosensitive element, and the central optical axes of the multi-group lens and the photosensitive element are aligned. The camera module further includes a filter element, and the filter element is mounted on the base. Among them, the filter element can be mounted on the base by means of reverse pasting.

[0149] Combining the above embodiments, the present invention further provides an assembly method for a multi-group lens. Taking the lens of Embodiment 1 as an example, the specific steps are as follows:

[0150] Step S01, assembling two group units 11 and 12;

[0151] Step S02, determining the relative positions of the two group units 11 and 12 by an active calibration method; and

[0152] Step S03, fixing the two group units 11 and 12 to form a multi-group lens 10.

[0153] In step S01, the cooperative assembly of the two group units can be achieved by setting an assembly structure in the corresponding group unit. Specifically, reference can be made to the structures of the upper group unit 11 and the lower group unit 12 in the above embodiments and their combinations or equivalent implementation manners. Through the cooperation and constraint of the structures between the group units, the assembly error of the two group units is small and it is easy to assemble.

[0154] In step S02, if glue is used, a pre-fixing operation can be performed. For example, first apply UV thermosetting glue, then perform active calibration, and then perform ultraviolet light irradiation to pre-fix the group unit. This pre-fixing can also be achieved in other ways, such as first performing active calibration on the upper and lower group units, and then pre-fixing the upper and lower groups through a bonding medium. If welding is used, first perform active calibration on the upper and lower group units, and then perform welding fixation. In addition, the upper and lower group units can also be fixed by heating and baking.

[0155] Specifically, taking Embodiment 1 as an example, when there is only one glass lens in the upper lens group 111, it is fixed to the upper bearing member 112 by means of clamping the glass lens. The lower lens group 121 has five resin lenses, and the lenses of the lower lens group 121 can be fixed to the lower bearing member 122 by means of clamping. After the above clamping, an adhesive medium can also be added between the lens and the bearing member for dispensing to improve the stability of the lens clamping, avoid the deviation of the optical axis caused by the lens offset, and further affect the imaging quality. In this way, during the overall assembly process of the multi-group lens in Embodiment 1, the upper and lower group units are fixed by one-time dispensing, or the lens and the upper and lower group units are fixed separately twice, so that the packaging of the multi-group lens 10 is more stable, firm and has good sealing performance.

[0156] The assembly method of the imaging module with the multi-group lens of Embodiment 1 of the present invention includes the following steps:

[0157] Step S11, assembling a group unit and a driving element 30 to obtain a driving lens assembly;

[0158] Step S12, assembling the driving lens assembly to the photosensitive component 20;

[0159] Step S13, assembling another group unit to the driving lens assembly to form an imaging module.

[0160] The group units in the above steps S11 and S13 are not limited to two. When there are multiple group units, at least one group unit and the driving element are assembled in step S11 to obtain a driving lens assembly; the multiple group units are sequentially arranged on the driving element according to the assembly method described above, and the multiple group units are installed in an active calibration manner. Among the other group units not installed in step S13, at least one is assembled on the driving lens assembly; the multiple group units are sequentially arranged on the driving lens assembly, and the multiple group units are installed in an active calibration manner.

[0161] Or, the steps are as follows:

[0162] Step S11’, assembling two group units to obtain a multi-group lens 10;

[0163] Step S12’, assembling the multi-group lens 10 and the driving element 30 to obtain a driving lens assembly 30;

[0164] Step S13’, assembling the driving lens assembly to the photosensitive component 20 to form an imaging module.

[0165] The group units in the above step S11’ are not limited to two. When there are multiple group units, a multi-group lens is sequentially assembled according to the assembly method described above, and the multiple group units are installed in an active calibration manner.

[0166] The multi-group lens can be assembled and applied to different types of camera modules. The camera module can be applied to electronic devices. The electronic devices include, by way of example but not limitation, smart phones, wearable devices, computer devices, televisions, vehicles, cameras, monitoring devices, etc.

[0167] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The object of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and described in the embodiments, and without departing from the said principles, the embodiments of the present invention can have any deformation or modification.

Claims

1. Multi-group lens, Characterized in that, Comprising: A plurality of group units, wherein the lenses within the group units are made of any two or three of glass material, resin material, and glass-resin composite material, or only made of glass-resin composite material; Among two adjacent group units, the group unit closer to the object side is the upper group unit, and the upper group unit includes an upper lens group and an upper carrier member, and the upper lens group is disposed on the upper carrier member; among two adjacent group units, the group unit closer to the image side is the lower group unit, and the lower group unit includes a lower lens group and a lower carrier member, and the lower lens group is disposed on the lower carrier member; The upper carrier member includes: An upper carrier body, and the upper lens group is disposed on the upper carrier body; and An upper extension portion, and the upper extension portion extends outward from the upper carrier body, and the upper extension portion includes an upper extension portion extending in the direction of the lower group unit; The lower carrier member includes: A lower carrier body, and the lower lens group is disposed on the lower carrier body; A lower inner extension portion, and the lower inner extension portion extends inward from the lower carrier body; and A lower overlapping portion, and the lower overlapping portion is disposed on the lower carrier body; Wherein, the lower overlapping portion, the upper extension portion, and the lower inner extension portion cooperate to form an assembly structure, and the assembly structure is used to assemble two adjacent group units, and adjacent group units are assembled by an active calibration method; when the upper extension portion of the upper extension portion overlaps the lower overlapping portion, the lower inner extension portion extends into the space where the upper carrier body and the upper extension portion communicate with each other, and is restricted by the upper carrier body and the upper extension portion of the upper extension portion in the axial and circumferential directions of the multi-group lens; the upper lens group is accommodated between the upper carrier body and the lower inner extension portion; Wherein, an adjustment gap is left between the upper carrier body and the lower inner extension portion; an adjustment gap is left between the bottom of the lens closest to the image side in the upper group unit and the lower inner extension portion; an adjustment gap is left between the upper extension portion and the lower inner extension portion; an adjustment gap is left between the upper extension portion and the lower overlapping portion; each adjustment gap is 2 microns - 600 microns.

2. The multi-group lens according to claim 1, Characterized in that, The group unit closest to the object side includes at least one glass lens or glass-resin composite lens.

3. The multi-group lens according to claim 2, Characterized in that, The lens closest to the object side in the group unit closest to the object side is a glass lens or a glass-resin composite lens.

4. The multi-group lens according to claim 1, Characterized in that, The group unit closest to the image side includes at least one glass lens or glass-resin composite lens.

5. The multi-group lens according to claim 1, Characterized in that, The upper carrier body has an upper carrier body mating groove; the upper extension portion further includes an upper mating groove; the upper carrier body mating groove and the upper mating groove communicate with each other in the extending direction of the upper extension portion.

6. The multi-group lens according to claim 1, Characterized in that, The lower overlapping portion is provided with a lower mating groove for accommodating one or more of bonding media and welding media.

7. The multi-group lens according to claim 6, wherein, the overlapping part of the upper extension part and the lower overlapping part covers a part of the lower fitting groove in the axial direction of the multi-group lens.

8. The multi-group lens according to claim 6, wherein, the top of the lower overlapping part is flush with the top of the lower fitting groove.

9. The multi-group lens according to claim 1, wherein, the lower overlapping part includes a lower extension part extending towards the upper group unit.

10. The multi-group lens according to claim 9, wherein, there is an adjustment gap between the lower extension part and the upper extension part.

11. The multi-group lens according to claim 9, wherein, the free end of the lower extension part extends to be at most flush with the uppermost end of the multi-group lens.

12. The multi-group lens according to claim 9, wherein, the free end of the lower extension part extends to be at least flush with the free end of the upper extension part.

13. The multi-group lens according to claim 9, wherein, the lower overlapping part is provided with a lower fitting groove located between the lower extension part and the lower inner extension part.

14. The multi-group lens according to claim 9, wherein, at least a part of the inner side surface of the lower extension part, at least near the upper end surface of the lower extension part, is an inclined surface.

15. The multi-group lens according to claim 9, wherein, the lower extension part and the upper extension part are assembled and fitted through an adhesive medium and / or a welding medium.

16. The multi-group lens according to claim 15, wherein, the adhesive medium is one or more of UV glue, thermosetting glue, moisture-curing glue, and pressure-sensitive glue.

17. The multi-group lens according to claim 15, wherein, the adhesive medium is UV thermosetting glue.

18. The multi-group lens according to claim 15, wherein, the adhesive medium is epoxy resin glue.

19. The multi-group lens according to claim 1, wherein, at least one of the group units includes at least one spacer ring.

20. An assembling method of a multi-group lens, wherein, for assembling the multi-group lens according to any one of claims 1-19, comprising the following steps: Step S01, assembling the group units; Step S02, determining the relative positions of adjacent group units by an active calibration method; and Step S03, fixing the group units to form a multi-group lens.

21. An imaging module, wherein, comprising: the multi-group lens according to any one of claims 1-19, and a photosensitive component, wherein the multi-group lens is located in the photosensitive path of the photosensitive component.

22. The imaging module according to claim 21, wherein, it further includes a driving element, and the multi-group lens is arranged on the driving element.

23. An assembling method of an imaging module, wherein, for assembling the imaging module according to claim 22, comprising the following steps: Step S11, assembling at least one group unit and a driving element to obtain a driving lens assembly; Step S12, assembling the driving lens assembly on the photosensitive component; Step S13, assemble other group units to the driving lens assembly to form an imaging module.

24. The method for assembling an imaging module according to claim 23, wherein, Step S12 is assembled by an active calibration method.

25. The method for assembling an imaging module according to claim 23, wherein, Step S13 is assembled by an active calibration method.

26. The method for assembling an imaging module, wherein, for assembling the imaging module according to claim 22, comprising the following steps: Step S11’, assemble at least two group units to obtain a multi-group lens; Step S12’, assemble the multi-group lens and a driving element to obtain a driving lens assembly; Step S13’, assemble the driving lens assembly to a photosensitive component to form an imaging module.

27. The method for assembling an imaging module according to claim 26, wherein, Step S13’ is assembled by an active calibration method.

28. An electronic device, wherein, comprises the imaging module according to claim 21.

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