CN116794794A

CN116794794A - Lens assembly, assembling method thereof and camera module

Info

Publication number: CN116794794A
Application number: CN202210261378.1A
Authority: CN
Inventors: 白华; 卞强龙; 刘佳; 胡国权; 龚铁夫
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2023-09-22
Also published as: WO2023173997A1

Abstract

The invention discloses a lens assembly, an assembling method thereof and an image pickup module, wherein the lens assembly comprises an outer lens group, a focusing lens group, an inner lens group, a bearing part and a driving part, wherein the outer lens group, the focusing lens group and the inner lens group are sequentially arranged along the optical axis direction, the focusing lens group is arranged on the bearing part, the driving part comprises a driving coil and a driving magnet which are corresponding in position, one of the driving coil and the driving magnet is arranged on the bearing part, and when the driving coil is electrified, a magnetic field generated by the driving coil and a magnetic field of the driving magnet can interact to drive the focusing lens group to move along the optical axis direction so as to realize focusing of the image pickup module.

Description

Lens assembly, assembling method thereof and camera module

Technical Field

The present invention relates to optical imaging devices, and more particularly to a lens assembly, an assembling method thereof, and an image capturing module.

Background

In recent years, small-sized image pickup apparatuses equipped with imaging elements such as CCD (Charge Coupled Device) type image sensors and CMOS (Complementary Metal-Oxide Semiconductor) type image sensors have been increasingly mounted on portable electronic devices. In addition, as portable electronic devices are moving toward the trend of being light and thin, stringent requirements are put on the size of the camera module; meanwhile, a user has also put a higher expectation on the imaging capability of the camera module, for example, when the camera module with an optical lens with 3-5 lenses is loaded in a portable electronic device, there is often a requirement for automatic focusing, so as to expect a better imaging effect. In such an imaging module, since the number of lenses is small, a multi-position single focus is often achieved by driving the optical lens to move as a whole by an overall driving structure, that is, a surrounding driver (for example, a voice coil motor) is disposed outside the optical lens, and the driver can drive the optical lens to move in the optical axis direction to achieve focusing of the imaging module. However, since the driver surrounds the outside of the optical lens, and the driver has a complex structure and a large size, the overall size of the camera module is large, which cannot meet the configuration requirement of the light and thin electronic device.

In recent years, in order to reduce the volume of an image pickup module and make it meet the demands of portable electronic devices, an internal focusing scheme for moving a part of lenses of an optical lens has been proposed, but an optical lens employing internal focusing is required to have a driving mechanism for moving the lenses in the optical axis direction for focusing, and thus in an internal focusing image pickup module, there is a tendency that an increase in mechanical parts and decentration of the center position of the lens in the optical axis direction are caused, so that problems such as single-side blur tend to occur in the image pickup module, and the like, are caused.

Disclosure of Invention

An object of the present invention is to provide a lens assembly, an assembling method thereof, and an image capturing module, wherein a focusing function is built in the lens assembly, so that the image capturing module does not need to change the position and size of the entire lens assembly during focusing, i.e. the optical total length of the lens assembly is not affected, thereby being beneficial to reducing the height size of the image capturing module and realizing miniaturization of the image capturing module.

An object of the present invention is to provide a lens assembly, an assembling method thereof, and an image capturing module, wherein a driving portion of the lens assembly is sunk, so as to reduce a size of the image capturing module at a corresponding position of a lens group outside the lens assembly, thereby facilitating miniaturization of the image capturing module.

An object of the present invention is to provide a lens assembly, an assembling method thereof, and an image capturing module, wherein an inner lens group of the lens assembly is a D-CUT lens group, and the driving portion is disposed at a position corresponding to a circular arc edge of the inner lens group, so that the image capturing module is narrowed to further reduce the size of the image capturing module.

An object of the present invention is to provide a lens assembly, an assembling method thereof, and an image capturing module, wherein a lens carrier of the lens assembly for carrying the outer lens group can avoid a carrying portion for suspending a focusing lens group of the lens assembly, which is beneficial to increasing a stroke of the focusing lens group and realizing focusing of the image capturing module in a larger range.

An object of the present invention is to provide a lens assembly, an assembling method thereof, and an image capturing module, wherein the outer lens group can avoid the bearing portion and the focusing lens group, so that the stroke of the focusing lens group is further increased to achieve focusing of the image capturing module in a larger range.

An object of the present invention is to provide a lens assembly, an assembling method thereof and an image capturing module, wherein the lens assembly provides a suspension portion for reliably and stably suspending the bearing portion and the focusing lens group between the outer lens group and the inner lens group. Preferably, the suspension portion allows the driving portion to smoothly drive the carrier portion and the focus lens group to move in the optical axis direction, so as to improve the focus sensitivity of the image pickup module and reduce the requirement for the driving force of the driving portion.

According to one aspect of the present invention, there is provided a lens assembly comprising:

an outer lens group;

a focus lens group;

an inner lens group, wherein the outer lens group, the focusing lens group, and the inner lens group are sequentially arranged along an optical axis direction;

a carrying portion, wherein the focus lens group is disposed on the carrying portion; and

and the driving part comprises a driving coil and a driving magnet which are corresponding in position, and one of the driving coil and the driving magnet is arranged on the bearing part.

According to an embodiment of the present invention, the bottom of the bearing portion extends to the outside of the inner lens group.

According to one embodiment of the invention, the carrier comprises a bottom carrier element, a top carrier element and an extension arm extending integrally upward and inward from the bottom carrier element to the top carrier element, wherein the bottom carrier element has a holding cavity, the inner lens group is held in the holding cavity of the bottom carrier element, wherein one of the drive coil and the drive magnet is arranged to the bottom carrier element, wherein the focus lens group is arranged to the top carrier element.

According to one embodiment of the present invention, the lens assembly further includes a lens carrier, the outer lens group is disposed on the lens carrier, wherein the lens carrier has a carrier avoidance space, and the carrier avoidance space of the lens carrier corresponds to the extension arm of the bearing portion to allow the extension arm of the bearing portion to enter the carrier avoidance space of the lens carrier.

According to one embodiment of the present invention, the outer lens group has a lens avoiding space, and the lens avoiding space of the outer lens group corresponds to and communicates with the carrier avoiding space of the lens carrier.

According to one embodiment of the invention, the outer lens group is provided with a lens avoiding groove, and the lens avoiding space is communicated with the lens avoiding groove.

According to an embodiment of the present invention, the lens assembly further includes a driving base adjacently disposed to the bearing portion, wherein the driving coil is disposed to the driving base, and the driving magnet is disposed to the bearing portion.

According to an embodiment of the present invention, the bearing portion has an insertion groove, the driving magnet is inserted into the insertion groove of the bearing portion, and accordingly, the driving seat has a coil accommodation chamber, and the driving coil is accommodated in the coil accommodation chamber of the driving seat.

According to one embodiment of the present invention, the driving part includes a circuit board, the driving coil is mounted on the circuit board, wherein the coil accommodating cavity of the driving seat is in a through hole shape, and the circuit board is mounted on the driving seat to keep the driving coil in the coil accommodating cavity of the driving seat.

According to one embodiment of the invention, the driving seat is provided with a seat groove, and the circuit board is positioned in the seat groove of the driving seat.

According to an embodiment of the present invention, the lens assembly further includes a suspension portion including a magnetic attraction unit and a support unit, wherein the magnetic attraction unit is disposed at the driving base, and a position of the magnetic attraction unit corresponds to a position of the driving magnet to generate a magnetic attraction force therebetween, and wherein the support unit is disposed between the driving base and the bearing portion.

According to one embodiment of the invention, the support unit comprises balls rollably arranged between the drive seat and the carrier.

According to an embodiment of the invention, at least one of the drive socket and the carrier is provided with a track groove of the support unit, in which track groove the balls are rollably held.

According to one embodiment of the present invention, the inner lens group has two opposite circular arc sides and two opposite cut sides, wherein the driving part is disposed at a position corresponding to the circular arc sides of the inner lens group.

According to another aspect of the present invention, there is further provided an image capturing module, including a photosensitive assembly and a lens assembly disposed on a photosensitive path of the photosensitive assembly, wherein the lens assembly includes:

an outer lens group;

a focus lens group;

Drawings

Fig. 1 is a schematic perspective view of an image capturing module according to a preferred embodiment of the present invention.

Fig. 2A and 2B are schematic cross-sectional views of different positions of the camera module according to the above preferred embodiment of the invention.

Fig. 3A and 3B are respectively exploded views of the camera module according to the above preferred embodiment of the invention.

Fig. 4A and fig. 4B are schematic cross-sectional views of different states of the camera module according to the above preferred embodiment of the invention.

FIG. 5 is a schematic cross-sectional view of an image capturing module according to another preferred embodiment of the present invention.

FIG. 6 is a schematic cross-sectional view of an image capturing module according to still another preferred embodiment of the present invention.

Detailed Description

Before any embodiments of the invention are explained in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the following drawings. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including," "comprising," or "having" and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless specified or limited otherwise, the terms "mounted," "connected," "supported," and "coupled" and variations thereof are used broadly and encompass both direct and indirect mountings, connections, supports, and couplings. Furthermore, "connected" and "coupled" are not restricted to physical or mechanical connections or couplings.

Also, in the present disclosure, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present disclosure and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus the above terms should not be construed as limiting the present disclosure; in a second aspect, the terms "a" and "an" should be understood as "at least one" or "one or more", i.e. in one embodiment the number of one element may be one, while in another embodiment the number of the element may be plural, the term "a" should not be construed as limiting the number.

Referring to fig. 1 to 4B of the drawings, a camera module according to a preferred embodiment of the present invention is disclosed and described in the following description, wherein the camera module includes a photosensitive member 10 and a lens member 20 disposed on the photosensitive member 10.

Specifically, referring to fig. 1 to 4B, the photosensitive assembly 10 includes a circuit board 11, a photosensitive chip 12, and a lens holder 13, wherein the photosensitive chip 12 is electrically connected to the circuit board 11, the lens holder 13 has a light-passing hole 131, the lens holder 13 is disposed on the circuit board 11, and the photosensitive chip 12 corresponds to the light-passing hole 131 of the lens holder 13, such that incident light is allowed to reach a photosensitive area of the photosensitive chip 12 after passing through the light-passing hole 131 of the lens holder 13, so as to be imaged by photoelectric conversion of the photosensitive chip 12.

Preferably, the photosensitive assembly 10 further includes at least one set of connection lines 14, the photosensitive chip 12 is mounted to the circuit board 11, one end of the connection line 14 is soldered to a chip pad of the photosensitive chip 12, and the other end of the connection line 14 is soldered to a board pad of the circuit board 11 to conductively connect the photosensitive chip 12 and the circuit board 11 by the connection line 14.

Preferably, referring to fig. 1 to 4B, the lens holder 13 is a preform, which is attached to the circuit board 11, and the light sensing chip 12 corresponds to the light passing hole 131 of the lens holder 13.

Alternatively, in another preferred embodiment of the camera module shown in fig. 5, the lens base 13 is integrally formed on the circuit board 11 and the non-photosensitive area of the photosensitive chip 12, wherein the light-transmitting hole 131 of the lens base 13 is formed at the same time as the lens base 13 is formed, and the photosensitive area of the photosensitive chip 12 corresponds to the light-transmitting hole 131 of the lens base 13. In this embodiment of the camera module, the lens holder 13 may embed the connection wires 14 to prevent the connection wires 14 from falling off the circuit board 11 or the photosensitive chip 12.

Alternatively, in other examples of the camera module of the present invention, the lens holder 13 is integrally formed on the circuit board 11, and a safe distance is provided between the lens holder 13 and the photosensitive chip 12, so that after the lens holder 13 is integrally formed on the circuit board 11, the photosensitive chip 12 may be attached to the circuit board 11 through the light-transmitting hole 131 of the lens holder 13.

With continued reference to fig. 1-4B, the photosensitive assembly 10 further includes at least one electronic component 15, where the electronic component 15 may be, but is not limited to, a resistor, a capacitor, a processor, etc., and the electronic component 15 is attached to the circuit board 11 with a safe distance between the electronic component 15 and the lens base 13.

Optionally, in another preferred embodiment of the camera module shown in fig. 5, the lens holder 13 integrally embeds the electronic component 15, i.e. no safety distance is provided between the electronic component 15 and the lens holder 13, which is advantageous for reducing the length-width and height dimensions of the camera module.

With continued reference to fig. 1-4B, the photosensitive assembly 10 further includes a filter 16, which may be, but is not limited to, an ir cut filter, wherein the filter 16 is attached to the top surface of the lens base 13 to maintain the filter 16 in the photosensitive path of the photosensitive chip 12, so that the incident light can be filtered by a specific type of light when passing through the filter 16, so as to facilitate the subsequent clear imaging of the photosensitive chip 12.

With continued reference to fig. 1-4B, the photosensitive assembly 10 further includes a connector 17, the connector 17 being disposed on the circuit board 11, wherein the connector 17 is configured to connect the camera module to a portable electronic device.

With continued reference to fig. 1 to 4B, the lens assembly 20 is attached to the lens holder 13 of the photosensitive assembly 10 to maintain a photosensitive path of the lens assembly 20 on the photosensitive chip 12 of the photosensitive assembly 10, so that incident light can reach the photosensitive chip 12 after sequentially passing through the lens assembly 20, the optical filter 16 and the light-transmitting hole 131 of the lens holder 13, to allow the photosensitive chip 12 to perform photoelectric conversion for imaging.

In this way, on one hand, the camera module has a focusing function to facilitate improving the imaging quality of the camera module, and on the other hand, the camera module does not need to change the position and the size of the whole camera module 20 during focusing, i.e. the optical total length of the camera module 20 is not affected, thereby facilitating reducing the height size of the camera module to realize miniaturization of the camera module so as to meet the requirement of miniaturization of the open pore of the portable electronic device.

Specifically, with continued reference to fig. 1 to 4B, the lens assembly 20 includes an outer lens group 21, a focusing lens group 22, and an inner lens group 23, wherein the outer lens group 21, the focusing lens group 22, and the inner lens group 23 are sequentially arranged along the optical axis direction to allow incident light to reach the photosensitive chip 12 after sequentially passing through the outer lens group 21, the focusing lens group 22, and the inner lens group 23 of the lens assembly 20, and through the optical filter 16 of the photosensitive assembly 10, so that the photosensitive chip 12 can be photoelectrically converted to image later.

In the process of focusing by the image capturing module, the position of the outer lens group 21 of the lens assembly 20 relative to the photosensitive chip 12 and the position of the inner lens group 23 relative to the photosensitive chip 12 are kept unchanged, and the focusing lens group 22 of the lens assembly 20 is driven to move along the optical axis direction so as to change the positions of the focusing lens group 22 relative to the outer lens group 21, the inner lens group 23 and the photosensitive chip 12.

The lens assembly 20 includes a housing 24, the housing 24 further includes a case 241 and a base 242, and has a focusing space 243. The housing 241 has a housing channel 2411, the outer lens group 21 is held on the upper side of the housing 241, and the outer lens group 21 corresponds to the housing channel 2411 of the housing 241. The base 242 has a base channel 2421, the inner lens group 23 is disposed on the upper side of the base 242, and the inner lens group 23 corresponds to the base channel 2421 of the base 242. The housing 241 and the base 242 are mounted to each other to form the focusing space 243 between the housing 241 and the base 242, wherein the focusing lens group 22 is drivably suspended between the outer lens group 21 and the inner lens group 23 in the focusing space 243 of the housing 24, so that the lens assembly 20 has a built-in focusing function.

It will be appreciated that the outer lens group 21 and the housing 24 form the general appearance of the lens assembly 20.

It should be noted that the mounting manner of the case 241 and the base 242 of the housing 24 is not limited in the camera module of the present invention. For example, the case 241 and the base 242 of the housing 24 may be snappingly mounted to each other, or the case 241 and the base 242 may be adhered.

The outer lens group 21 is held on the upper side of the housing 241 to allow the lens assembly 20 to adopt a "small-head" design, so that when the camera module is used as a front camera module of an electronic device, the outer lens group 21 of the lens assembly 20 can be closer to an opening position of a screen of the electronic device, thereby being beneficial to the camera module to obtain a larger angle of view and light flux, so as to improve the imaging quality of the camera module.

The lens assembly 20 further comprises a lens carrier 25, wherein the lens carrier 25 is mounted on the shell 241 of the shell 24, and the lens carrier 25 protrudes into the shell channel 2411 of the shell 241, wherein the outer lens group 21 is attached to the lens carrier 25, so that the outer lens group 21 is arranged outside the shell 241. Alternatively, in other examples of the image capturing module of the present invention, the outer lens group 21 may be directly mounted to the outside of the case 241 of the housing 24 to dispose the outer lens group 21 on the upper side of the case 241.

Specifically, the outer lens group 21 includes an outer lens barrel 211 and at least one outer lens 212 mounted on the outer lens barrel 211, wherein an end surface of the outer lens barrel 211 of the outer lens group 21 may be attached to the lens carrier 25 by an adhesive such as glue. Preferably, a gap is formed between the end surface of the outer lens barrel 211 of the outer lens group 21 and the lens carrier 25, so that there is a space for actively calibrating the assembly position of the outer lens group 21 when the outer lens group 21 is assembled, and after the active calibration is completed, the gap is filled with an adhesive such as glue to fix the outer lens group 21 and the lens carrier 25 and enhance the sealing performance of the lens assembly 20, thereby preventing contaminants such as dust from entering the lens assembly 20. More specifically, the outer lens group 21 includes two outer lenses 212, wherein the two outer lenses 212 are mounted to the outer barrel 211 in the height direction.

Referring to fig. 3A and 3B, the lens carrier 25 includes a carrier fixing member 251, a carrier arm 252, and a carrier 253, the carrier arm 252 integrally extending inwardly from the carrier fixing member 251, and the carrier 253 integrally extending upwardly from the carrier arm 252. The carrier fixing member 251 of the lens carrier 25 is mounted to the housing 241 of the housing 24 such that the carrier fixing member 251 is held in the focusing space 243 of the housing 24, and the mount 253 protrudes into the housing channel 2411 of the housing 241, wherein the outer lens barrel 211 of the outer lens group 21 is mounted to the mount 253 of the lens carrier 25 such that the outer lens group 21 is disposed on the upper side of the housing 241 through the lens carrier 25.

The inner lens group 23 is disposed on the upper side of the base 242 of the housing 24 to keep the inner lens group 23 in the focusing space 243 of the housing 24, so as to prevent the inner lens group 23 from protruding downward from the base 242, so that the base 242 of the housing 24 can be directly attached to the lens base 13 to mount the lens assembly 20 on the photosensitive assembly 10.

Specifically, the inner lens group 23 includes an inner lens barrel 231 and at least one inner lens 232 mounted on the inner lens barrel 231, and an end surface of the inner lens barrel 231 is attached to an upper side of the base 242 of the housing 24 to position the inner lens group 23 on the upper side of the base 242. More specifically, the inner lens group 23 includes two inner lenses 232, and the two inner lenses 232 are mounted to the inner barrel 231 in the height direction.

Preferably, the inner lens group 23 is attached to the upper side of the base 242 by an adhesive such as glue between the end surface of the inner lens barrel 231 and the base 242, wherein the adhesive such as glue can fix the inner lens group 23 after calibration and fill a gap formed between the bottom end of the inner lens barrel 231 and the upper side of the base 242 to enhance the sealing performance of the lens assembly 20, thereby preventing contaminants such as dust from entering the inside of the lens assembly 20.

The focusing lens group 22 further comprises a focusing lens barrel 221 and at least one focusing lens 222 mounted on the focusing lens barrel 221. The outer lens 212 of the outer lens group 21, the focusing lens 222 of the focusing lens group 22, and the inner lens 232 of the inner lens group 23 form a complete optical system, and as the positions of the focusing lens group 22 relative to the outer lens group 21 and the inner lens group 23 change, the focal position of the optical system is changed to achieve focusing of the image capturing module.

With continued reference to fig. 1 to 4B, the lens assembly 20 further includes a driving portion 26 and a bearing portion 27 drivably connected to the driving portion 26, and the focusing lens group 22 is disposed on the bearing portion 27, where the driving portion 26 is configured to drive the focusing lens group 22 to move between the outer lens group 21 and the inner lens group 23 along the optical axis direction by the bearing portion 27, so as to achieve focusing of the image capturing module.

Preferably, the bottom of the bearing portion 27 extends to the outside of the inner lens group 23 and is drivably connected to the driving portion 26, so that the driving portion 26 is sunk to the outside of the inner lens group 23, which is beneficial to reducing the length-width space and height space of the camera module occupied by the driving portion 26, thereby reducing the length-width size of the camera module and reducing the height size of the camera module.

Preferably, the inner lens group 23 is a double-sided D-CUT lens group, such that the inner lens group 23 has two opposite circular arc sides 233 and two opposite CUT sides 234, wherein the driving part 26 is disposed at a position corresponding to the circular arc sides 233 of the inner lens group 23, which is beneficial to narrowing the camera module and further reducing the width dimension of the camera module.

Referring to fig. 3A and 3B, the bearing portion 27 includes a bottom bearing member 271, a top bearing member 272, and at least one extension arm 273, wherein the extension arm 273 integrally extends upwardly and inwardly from the bottom bearing member 271 to the top bearing member 272 such that the height of the top bearing member 272 is higher than the height of the bottom bearing member 271. The bottom carrier 271 has a holding cavity 2711, and the inner lens group 23 is held in the holding cavity 2711 of the bottom carrier 271 to allow the bottom of the carrier 27 to extend to the outside of the inner lens group 23. The focus lens barrel 221 of the focus lens group 22 is attached to the top carrier element 272 of the carrier 27. For example, the top carrier element 272 has a ring shape, and after the focus lens group 22 is mounted on the top carrier element 272 of the carrier 27 and the focus lens group 22 is actively aligned, an adhesive such as glue may be used to fix the focus lens barrel 221 of the focus lens group 22 and the top carrier element 272 of the carrier 27.

It should be noted that the number of the extension arms 273 of the carrying portion 27 is not limited in the camera module of the present invention. For example, in this particular example of the camera module shown in fig. 1 to 4B, the carrying portion 27 comprises four extension arms 273, the four extension arms 273 being preferably distributed equidistantly. Alternatively, in other specific examples of the camera module of the present invention, the number of the extension arms 273 of the carrying portion 27 may be two, three, five, six or more.

With continued reference to fig. 3A and 3B, the lens carrier 25 has at least one carrier avoidance space 254, and the position of the extension arm 273 of the carrying portion 27 corresponds to the position of the carrier avoidance space 254 of the lens carrier 25, wherein when the driving portion 26 drives the focus lens group 22 to move along the optical axis direction through the carrying portion 27, the extension arm 273 of the carrying portion 27 can enter the carrier avoidance space 254 of the lens carrier 25 to allow the lens carrier 25 to avoid the carrying portion 27, so that the carrying portion 27 and the focus lens group 22 have a larger stroke, and the image pickup module can focus in a larger range.

Preferably, the outer lens barrel 211 of the outer lens group 21 has at least one lens avoidance space 2111, the lens avoidance space 2111 of the outer lens barrel 211 and the carrier avoidance space 254 of the lens carrier 25 correspond to each other and communicate, wherein when the driving part 26 drives the focusing lens group 22 to move along the optical axis direction through the bearing part 27, the extension arm 273 of the bearing part 27 can enter the carrier avoidance space 254 of the lens carrier 25 and the lens avoidance space 2111 of the outer lens barrel 211, so that the bearing part 27 and the focusing lens group 22 have a larger stroke, and the camera module can focus in a larger range. Preferably, the outer lens barrel 211 of the outer lens group 21 further has a lens avoidance groove 2112, the lens avoidance groove 2112 is in communication with the lens avoidance space 2111, and the focusing lens group 22 can enter the lens avoidance groove 2112 of the outer lens barrel 211 to allow the outer lens group 21 to avoid the focusing lens group 22, thereby allowing the imaging module to focus in a larger range.

Further, the driving part 26 includes a driving coil 261 and a driving magnet 262 with corresponding positions, wherein in this specific example of the image capturing module shown in fig. 1 to 4B, the driving magnet 262 is disposed on the carrying part 27, and when the driving coil 261 is energized, a magnetic field generated by the driving coil 261 interacts with a magnetic field of the driving magnet 262 to be able to drive the carrying part 27 and the focusing lens group 22 to move along the optical axis direction, thereby achieving focusing of the image capturing module. Alternatively, in another example of the image capturing module according to the present invention, the driving coil 261 is provided to the carrier 27, and when the driving coil 261 is energized, a magnetic field generated by the driving coil 261 and a magnetic field of the driving magnet 262 interact to be able to drive the carrier 27 and the focus lens group 22 to move in the optical axis direction, thereby achieving focusing of the image capturing module.

Preferably, with continued reference to fig. 1 to 4B, the driving magnet 262 of the driving portion 26 is disposed on the bottom supporting element 271 of the supporting portion 27, so that the driving portion 26 is sunk to the outside of the inner lens group 23, so as to be beneficial to reducing the length-width space and the height space of the camera module occupied by the driving portion 26. More preferably, the bottom carrier 271 has an insertion groove 2712, and the driving magnet 262 is inserted into the insertion groove 2712 of the bottom carrier 271 to facilitate reducing the length and width of the camera module.

With continued reference to fig. 1 to 4B, the lens assembly 20 includes a driving seat 28, the driving seat 28 is disposed adjacent to the carrying portion 27, and the driving coil 261 is disposed on the driving seat 28. In other words, the driving seat 28 is used to hold the driving coil 261 at a position corresponding to the driving magnet 262.

Preferably, the driving seat 28 has a through-hole-shaped seat space 281, wherein the bottom bearing member 271 of the bearing portion 27 is movably held in the seat space 281 of the driving seat 28 to hold the driving coil 261 in a position corresponding to the driving magnet 262 by the driving seat 28.

Preferably, the driving seat 28 is disposed on the base 242 of the housing 24, for example, the driving seat 28 and the base 242 of the housing 24 may be bonded by an adhesive such as glue, so as to dispose the driving seat 28 on the base 242 of the housing 24. Alternatively, the drive socket 28 and the base 242 of the housing 24 are integrally formed, i.e., the drive socket 28 extends integrally upward from the base 242 of the housing 24. Alternatively, the driving seat 28 is provided to the case 241 of the housing 24, or the driving seat 28 and the case 241 of the housing 24 are integrally formed.

Preferably, the carrier fixing element 251 of the lens carrier 25 is mounted to the driving seat 28 to maintain the carrier fixing element 251 in the focusing space 243 of the housing 24.

Further, the driving seat 28 has a coil accommodating cavity 282, and the coil accommodating cavity 282 extends outwards from the seat space 281, where the driving coil 261 is accommodated in the coil accommodating cavity 282 of the driving seat 28, so as to be beneficial to reducing the length and width dimensions of the camera module.

With continued reference to fig. 1-4B, the driving portion 26 includes a circuit board 263, and the driving coil 261 is electrically connected to the circuit board 263 to supply power to the driving coil 261 from the circuit board 263. For example, the circuit board 263 of the driving part 26 may be electrically connected to the circuit board 11 of the photosensitive assembly 10, wherein the driving coil 261 is capable of generating a magnetic field when the circuit board 11 supplies power to the driving coil 261 through the circuit board 263. Preferably, the circuit board 263 is a flexible circuit board, such as an FPC board, to reduce the space occupied by the circuit board 263.

Preferably, the coil accommodating chamber 282 of the driving seat 28 is in a through hole shape, the driving coil 261 is mounted on the circuit board 263, wherein the circuit board 263 is mounted on the outer wall of the driving seat 28, so that the driving coil 261 is held in the coil accommodating chamber 282 of the driving seat 28 by the circuit board 263. Preferably, the driving seat 28 has a seat groove 283, and the circuit board 263 is attached to the seat groove 283 of the driving seat 28, so as to reduce the length and width of the camera module.

With continued reference to fig. 1 to 4B, the lens assembly 20 further includes a suspension 29, the suspension 29 includes a magnetic attraction unit 291 and at least one support unit 292, wherein the magnetic attraction unit 291 is disposed on the driving socket 28, and the position of the magnetic attraction unit 291 corresponds to the position of the driving magnet 262 of the driving part 26, so as to allow the magnetic attraction unit 291 and the driving magnet 262 to attract each other due to magnetic attraction force, so that the bottom carrier element 271 of the carrier 27 has a tendency to approach the driving socket 28, and the support unit 292 is disposed between an outer wall of the bottom carrier element 271 of the carrier 27 and an inner wall of the driving socket 28, so as to prevent the bottom carrier element 271 of the carrier 27 from approaching the driving socket 28, so that the suspension 29 suspends the carrier 27 in the focusing space 243 of the housing 24. Preferably, the magnetic attraction unit 291 is mounted on the circuit board 263 of the driving section 26.

Further, the support unit 292 includes at least two balls 2921, and these balls 2921 are rollably held between the outer wall of the bottom carrier member 271 and the inner wall of the driving seat 28 to prevent the bottom carrier member 271 from approaching the driving seat 28 and allow the driving portion 26 to smoothly drive the carrier portion 27 and the focus lens group 22 to move in the optical axis direction. Preferably, each end of the driving magnet 262 is respectively held with at least one of the balls 2921 to avoid tilting of the bearing 27.

Preferably, the support unit 292 has two first rail grooves 2922 and two second rail grooves 2923 extending in the optical axis direction, the two first rail grooves 2922 are provided to the bottom carrier member 271 of the carrier portion 27, and the two first rail grooves 2922 are held at opposite sides of the fitting groove 2712 of the bottom carrier member 271, the two second rail grooves 2923 are provided to the driving seat 28, and the two second rail grooves 2923 are held at opposite sides of the seat groove 283, wherein a portion of the balls 2921 are rollably held at the first rail grooves 2922, a portion of the balls 2921 are held at the second rail grooves 2923, and the balls 2921 have a gap between an outer wall of the bottom carrier member 271 and an inner wall of the driving seat 28, so that the balls 2921 are rollably held between an outer wall of the bottom carrier member 271 and an inner wall of the driving seat 28.

With continued reference to fig. 1-4B, the lens assembly 20 further includes a dust cap 210, the dust cap 210 being attached to the housing 241 of the housing 24 for closing the housing channel 2411 of the housing 241 to prevent contaminants such as dust from entering the interior of the lens assembly 20 from the housing channel 2411 of the housing 241.

In addition, the assembly process of the lens assembly 20 of the camera module shown in fig. 1 to 4B is as follows.

In step S1, the lens carrier 25 is mounted inside the housing 241 from the bottom opening of the housing 241 of the casing 24, wherein the carrier fixing member 251 of the lens carrier 25 is located inside the housing 241, and the stage 253 of the lens carrier 25 protrudes into the housing channel 2411 of the housing 241.

In step S2, the driving coil 261, the circuit board 263 and the fixing base 28 of the magnetic unit 291 are installed in the shell 241 from the bottom opening of the shell 241 of the housing 24, wherein the driving coil 261 corresponds to the magnetic unit 291, and the driving coil 261 and the magnetic unit 291 are located on two opposite sides of the circuit board 263.

In step S3, the carrier 27 provided with the driving magnet 262 and a standard lens is mounted inside the housing 241 from the bottom opening of the housing 241 of the casing 24, wherein the driving magnet 262 is positioned corresponding to the driving coil 261 and the magnet unit 291, respectively, and the supporting unit 292 is held between the inner wall of the driving socket 28 and the outer wall of the bottom carrier 271 of the carrier 27 to suspend the carrier 27 by the magnetic attraction force generated by the driving magnet 262 and the magnet unit 291 and in cooperation with the supporting unit 292, wherein the standard lens 27 is temporarily disposed at the top carrier 272 of the carrier 27, and the standard lens 27 is capable of extending outside the housing 241 corresponding to the carrier avoiding space 254 of the lens carrier 25 and the housing channel 2411 of the housing 241.

Step S4, pre-fixing the inner lens group 23 on the base 242 of the housing 24.

In step S5, the case 241 and the base 242 of the housing 24 are mounted to allow the inner lens group 23 to extend to the holding cavity 2711 of the bottom carrier element 271 of the carrier 27, at which time the standard lens and the inner lens group 23 form one optical system capable of imaging.

Step S6, actively calibrating the inner lens group 23. Specifically, first, the alignment photosensitive assembly is energized so that light passing through the standard lens and the inner lens group 23 reaches the photosensitive chip of the alignment photosensitive assembly to be imaged; secondly, determining an adjustment amount according to the imaging quality by an image algorithm; and adjusting the relative position of the inner lens group 23 in at least one direction (X, Y, Z axial direction and X, Y, Z axial rotation direction) according to the adjustment amount, so that the imaging quality (mainly including optical parameters such as peak value, field curvature and astigmatism) reaches the target value, and the calibration of the inner lens group 23 is completed. After the relative positions of the inner lens group 23 are calibrated, the inner lens group 23 and the mount 242 of the housing 24 are fixed.

In step S7, the outer lens group 23 is pre-fixed on the stage 253 of the lens carrier 25, and at this time, the outer lens group 21, the standard lens and the inner lens group 23 form an optical system capable of imaging.

Step S8, actively calibrating the outer lens group 21. First, the alignment photosensitive assembly is energized so that light passing through the outer lens group 21, the standard lens, and the inner lens group 23 reaches the photosensitive chip of the alignment photosensitive assembly to be imaged; secondly, determining an adjustment amount according to the imaging quality by an image algorithm; and adjusting the relative position of the outer lens group 21 in at least one direction (X, Y, Z axial direction and X, Y, Z axial rotation direction) according to the adjustment amount, so that the imaging quality (mainly including optical parameters such as peak value, field curvature and astigmatism) reaches the target value, and the calibration of the outer lens group 21 is completed. After the relative positions of the outer lens group 21 are aligned, the mount 253 of the outer lens group 21 and the lens carrier 25 is fixed.

Step S9, replacing the standard lens by the focusing lens group 22. Specifically, first, the standard lens is moved laterally (perpendicular to the optical axis direction of the image pickup module) outside the case 241 via the carrier avoidance space 254 of the lens carrier 25 to remove the standard lens; next, the focusing lens group 22 is moved laterally outside the housing 241 through the carrier avoidance space 254 of the lens carrier 25 to move into the inner lens group 22, wherein the inner lens group 22 moved in is pre-fixed to the top carrier member 271 of the carrier 27, and at this time, the outer lens group 21, the focusing lens group 22, and the inner lens group 23 form one optical system capable of imaging.

Step S10, actively calibrating the focusing lens group 22. First, the alignment photosensitive assembly is energized so that the light rays passing through the outer lens group 21, the focus lens group 22, and the inner lens group 23 reach the photosensitive chip of the alignment photosensitive assembly to be imaged; secondly, determining an adjustment amount according to the imaging quality by an image algorithm; and adjusting the relative position of the focusing lens group 22 in at least one direction (X, Y, Z axial direction and X, Y, Z axial rotation direction) according to the adjustment amount, so that the imaging quality (mainly including optical parameters such as peak value, field curvature and astigmatism) reaches the target value, and the calibration of the focusing lens group 22 is completed. After the relative positions of the focus lens groups 22 are calibrated, the focus lens groups 22 and the top bearing element 272 of the bearing part 27 are fixed.

In step S11, the dust cap 210 is mounted on the shell 241 of the housing 24 to close the shell channel 2411 of the shell 241 by the dust cap 210.

Fig. 6 shows the image pickup module according to another preferred example of the present invention, unlike the image pickup module shown in fig. 1 to 4B, in this specific example of the image pickup module shown in fig. 6, an end surface of the bottom carrier member 271 of the carrier 27 is drivably connected to the driving part 26 to allow the driving part 26 to drive the carrier 27 and the focus lens group 22 to move in the optical axis direction at the bottom of the carrier 27 to achieve focusing of the image pickup module.

Specifically, the driving portion 26 includes a first piezoelectric plate 264, a deformable electrode plate 265 and a second piezoelectric plate 266 that are sequentially stacked, where the electrode plate 265 has an electrode plate terminal 2651 that is electrically connected to a negative electrode of a power control unit, where opposite sides of the first piezoelectric plate 264 have a first electrode layer 2641 and a second electrode layer 2642, respectively, the second electrode layer 2642 of the first piezoelectric plate 264 is connected to the electrode plate 265, the first electrode layer 2641 is electrically connected to a positive electrode of the power control unit, where opposite sides of the second piezoelectric plate 266 have a third electrode layer 2661 and a fourth electrode layer 2662, respectively, the third electrode layer 2661 of the second piezoelectric plate 266 is connected to the electrode plate 265, and the fourth electrode layer 2662 is electrically connected to the positive electrode of the power control unit. When the power control unit repeatedly applies a pulse voltage between the first electrode layer 2641 of the first piezoelectric sheet 264 and the third electrode layer 2661 of the second piezoelectric sheet 266 and the electrode sheet 265, the first electrode layer 2641 of the first piezoelectric sheet 264 and the third electrode layer 2661 of the second piezoelectric sheet 266 are energized to expand and contract to allow the cross-sectional pattern of the driving part 26 to take a convex arc shape (e.g., bowl shape), at this time, the driving part 26 drives the bearing part 27 and the focus lens group 22 to move in a direction away from the photosensitive assembly 10 along the optical axis at the bottom of the bearing part 27. Accordingly, when the power control unit repeatedly applies a pulse voltage between the second electrode layer 2642 of the first piezoelectric sheet 264 and the fourth electrode layer 2662 of the second piezoelectric sheet 266 and the electrode sheet 265, the second electrode layer 2642 of the first piezoelectric sheet 264 and the fourth electrode layer 2662 of the second piezoelectric sheet 266 are energized to expand and contract to allow the cross-sectional pattern of the driving part 26 to take a concave arc shape (e.g., bowl shape), at this time, the driving part 26 drives the bearing part 27 and the focus lens group 22 to move in a direction approaching the photosensitive assembly 10 along the optical axis at the bottom of the bearing part 27.

Preferably, the electrode plate 265 of the driving part 26 is a metal plate to allow the electrode plate 265 to have good elasticity, so that the driving part 26 can be quickly restored to an initial state by using the elasticity of the electrode plate 265 when the power control unit is powered off.

Preferably, the driving portion 26 is annular and surrounds the inner lens group 23.

It should be noted that the power control unit may be a logic unit formed by the circuit board 11 and the electronic component 15 of the photosensitive assembly 10.

It should be noted that the driving portion 26 may be disposed on the driving seat 28, or the driving portion 28 may be directly disposed on the base 242 of the housing 24.

It will be appreciated by persons skilled in the art that the above embodiments are examples only, wherein the features of the different embodiments may be combined with each other to obtain an embodiment which is readily apparent from the disclosure of the invention but which is not explicitly indicated in the drawings.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims

1. Lens subassembly, its characterized in that includes:

an outer lens group;

a focus lens group;

2. The lens assembly of claim 1, wherein a bottom of the carrier extends outside of the inner lens group.

3. The lens assembly of claim 2, wherein the carrier comprises a bottom carrier element, a top carrier element, and an extension arm integrally extending upwardly and inwardly from the bottom carrier element to the top carrier element, wherein the bottom carrier element has a holding cavity, the inner lens group is held in the holding cavity of the bottom carrier element, wherein one of the drive coil and the drive magnet is disposed to the bottom carrier element, wherein the focus lens group is disposed to the top carrier element.

4. A lens assembly according to claim 3, further comprising a lens carrier, the outer lens group being disposed to the lens carrier, wherein the lens carrier has a carrier avoidance space, the carrier avoidance space of the lens carrier corresponding to the extension arm of the carrier portion to allow the extension arm of the carrier portion to enter the carrier avoidance space of the lens carrier.

5. The lens assembly of claim 4, wherein the outer lens group has a lens avoidance space, the lens avoidance space of the outer lens group corresponding to and communicating with the carrier avoidance space of the lens carrier.

6. The lens assembly of claim 5, wherein the outer lens group has a lens relief groove, the lens relief space being in communication with the lens relief groove.

7. The lens assembly according to any one of claims 1 to 6, further comprising a driving mount provided adjacently to the bearing portion, wherein the driving coil is provided to the driving mount, and the driving magnet is provided to the bearing portion.

8. The lens assembly according to claim 7, wherein the carrier has an insertion groove, the driving magnet is inserted into the insertion groove of the carrier, and accordingly, the driving holder has a coil accommodation chamber, and the driving coil is accommodated in the coil accommodation chamber of the driving holder.

9. The lens assembly of claim 8, wherein the driving part comprises a circuit board, the driving coil is mounted on the circuit board, wherein the coil accommodating cavity of the driving seat is in a through hole shape, and the circuit board is mounted on the driving seat so as to keep the driving coil in the coil accommodating cavity of the driving seat.

10. The lens assembly of claim 9, wherein the driving base has a base groove, and the circuit board is located in the base groove of the driving base.

11. The lens assembly of claim 7, further comprising a suspension portion including a magnetic attraction unit and a support unit, wherein the magnetic attraction unit is disposed at the driving mount, and a position of the magnetic attraction unit corresponds to a position of the driving magnet to generate a magnetic attraction force therebetween, wherein the support unit is disposed between the driving mount and the bearing portion.

12. The lens assembly of claim 11, wherein the support unit comprises balls rollably disposed between the drive mount and the carrier.

13. The lens assembly of claim 12, wherein at least one of the driving base and the bearing is provided with a rail groove of the supporting unit, the ball being rollably held in the rail groove.

14. The lens assembly of any of claims 1-6, wherein the inner lens group has two opposing rounded edges and two opposing cut edges, wherein the drive portion is disposed at a location corresponding to the rounded edges of the inner lens group.

15. A camera module, its characterized in that includes:

a photosensitive assembly; and

the lens assembly of any of claims 1-14, wherein the lens assembly is disposed in a photosensitive path of the photosensitive assembly.