CN116668808A

CN116668808A - Lens unit, camera module and electronic equipment

Info

Publication number: CN116668808A
Application number: CN202210146153.1A
Authority: CN
Inventors: 叶林敏; 熊实; 周秀秀
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2023-08-29

Abstract

The invention relates to a lens unit, an imaging module and an electronic device. The lens unit comprises an optical lens and a cover plate component, the cover plate component comprises a movable sleeve and a transparent cover plate embedded in the movable sleeve, the movable sleeve can axially move relative to a fixed base of the lens unit in the direction of an optical axis of the lens, a sleeve bulge which downwards extends around the through hole is formed on the sleeve end wall of the movable sleeve, the aperture of the sleeve bulge is larger than that of the end face of the lens, and a first space in the center is formed inside the sleeve bulge and can be used for accommodating the upper end face of the lens and the iris. A peripheral second space is formed between the outside of the sleeve projection and the inside of the sleeve peripheral wall and below the sleeve projection and outwardly to the inside of the sleeve peripheral wall for accommodating the motor, stop, etc.

Description

Lens unit, camera module and electronic equipment

Technical Field

The present invention relates to the field of camera modules, and more particularly, to a lens unit, a camera module with the lens unit, and an electronic device including the camera module.

Background

In order to meet the development trend of the light and thin terminal equipment, various supporting factories are dedicated to researching the camera module with high imaging quality and reduced or unchanged overall height. The imaging quality of the camera module is improved, and the size of the photosensitive chip is increased. The size that current module of making a video recording is along with its imaging quality's continuous promotion sensitization chip constantly increases, and the height of module also constantly increases, when imaging in assembling terminal equipment with it, though jumbo size sensitization chip can promote imaging quality, can make the height increase of making a video recording the module, when installing terminal equipment with it in, its back can bulge terminal equipment shell certain height, when receiving external effort, its convex part is not only damaged easily, still can influence the aesthetic measure of its terminal product appearance, reduces user's experience and feels. There is an irreconcilable conflict between the increase in chip size and the height of the die set.

In order to reduce the overall height of the camera module while improving the imaging quality of the camera module, the camera module is suitable for the trend of developing the light and thin of terminal equipment, and in the prior art, a telescopic camera module structure exists, namely, a telescopic structure is arranged on an optical lens, when the camera module works, an optical lens is driven to be far away from a photosensitive chip through the telescopic structure, when the camera module does not work, the optical lens is enabled to be close to the photosensitive chip through the telescopic structure, the distance between the photosensitive chip and the optical lens is greatly compressed, and the structural design mode of the telescopic optical lens is matched with the photosensitive chip with a large size, so that the contradiction between the imaging quality and the module height can be solved.

However, since the optical lens needs to extend out of the housing of the terminal device in the imaging process, when the extending optical lens receives external force, such as beating, pressing and the like, the optical lens is extremely easy to damage, when the external force is large, the whole module structure is damaged, and normal operation of the terminal device cannot be ensured.

Meanwhile, the shooting environment of the shooting module is complex, the shooting module is in a sufficient environment, the shooting module is possibly exposed excessively due to sufficient light, and the shooting module is in a dim environment due to insufficient light, so that a shot object is blurred, the size of the shooting module is correspondingly increased under the condition that the size of a chip is large, the size of the shooting module is required to be reduced in order to meet the miniaturization requirement of the shooting module, the near-focus shooting resolution is poor when focusing is caused, and therefore the problem of near-focus aberration when shooting of a large-size chip can be compensated by adopting an iris diaphragm. In the existing camera module structure, the motor is used to drive the optical lens to realize Automatic Focusing (AF), so a solution is needed to be provided to ensure that the motor mechanism and the iris mechanism work together reliably so as to improve the imaging quality of the camera module.

In view of the above problems, it is desirable to provide a novel lens unit and camera module design to effectively solve the above part or most of the problems, so as to effectively improve the imaging quality of the camera module and achieve miniaturization of the module structure.

Disclosure of Invention

The invention aims to optimize the structural design of a telescopic lens, and provides a lens unit, an image pickup module with the lens unit and electronic equipment comprising the image pickup module.

According to a first aspect of the present invention, there is provided a lens unit including:

an optical lens comprising at least one lens element with a lens, and

the cover plate assembly comprises a cover plate supporting piece and a transparent cover plate embedded in the cover plate supporting piece, and the transparent cover plate is covered above the optical lens;

the cover plate support is configured as a movable sleeve that is axially movable in a lens optical axis direction with respect to a fixed base of the lens unit, and includes:

a sleeve end wall having a through hole into which the transparent cover plate is fitted, and

a sleeve peripheral wall extending downwardly at the periphery of the sleeve end wall,

wherein a sleeve projection extending downward around the through hole is formed on the sleeve end wall, the length of the sleeve projection extending downward is smaller than the length of the sleeve peripheral wall extending downward, a first space is formed in the center inside the sleeve projection, a second space is formed in the periphery between the outside of the sleeve projection and the inside of the sleeve peripheral wall and below the sleeve projection and outward to the inside of the sleeve peripheral wall, and the optical lens is at least partially accommodated in the first space with the upper end portion thereof.

Accordingly, in the lens unit of the present application, the sleeve-shaped supporting member of the cover plate assembly includes a sleeve protrusion extending downward, the inner diameter of the sleeve protrusion is larger than the outer diameter of the end portion of the lens, and a space (i.e. the first space) is formed inside the protrusion for accommodating the upper end surface of the lens and the selectively arranged iris diaphragm; the protruding outside forms a space (above-mentioned second space promptly), can be used to hold parts such as the relevant driving motor of camera lens part, backstop portion, reduces motor shoulder height, reduces the total height of telescopic module of making a video recording, makes the overall structure of module of making a video recording compacter, can also prevent effectively that the telescopic lens from receiving external force effect and leading to damaging in flexible in-process, avoids impurity such as outside dust liquid to get into the inside of the module of making a video recording simultaneously, promotes the image quality of the module of making a video recording.

It is specifically noted that the terms "upper", "lower", "inner", "outer" are defined herein in terms of the orientations shown in the drawings of the present application, and the directions from the object side to the image side along the optical axis of the lens barrel correspond to the directions from "up" to "down"; the terms "axial" and "radial" refer to the optical axis of the lens, i.e., the axial direction is along (or parallel to) the optical axis of the lens, and the radial direction is perpendicular to the optical axis of the lens; in accordance therewith, "inner" refers to an orientation radially closer to the optical axis, and "outer" refers to an orientation radially farther from the optical axis.

Further, the first space is configured as a cylindrical hole, and the diameter of the cylindrical hole is larger than that of the upper end part of the optical lens, so that the upper end part of the optical lens can be placed on the inner side of the protrusion of the sleeve, and the miniaturization requirement of the lens is met.

Further, the axial movement of the movable sleeve includes a retracting movement of the movable sleeve closer to the fixed base and an extending movement of the movable sleeve away from the fixed base.

Further, the lens unit comprises at least one first driving device for driving the movable sleeve to execute the retracting motion and at least one ejecting mechanism for pushing the movable sleeve to execute the extending motion, and the lens unit can be ejected and reset from the electronic equipment when in use through the cooperation of the first driving device and the ejecting mechanism.

Further, the first driving device includes a fixed portion fixed to the fixed base and a movable portion connected to the movable sleeve.

Further, the movable sleeve is configured with at least one actuation connection end on the outside of the sleeve peripheral wall thereof, which is connected with the movable portion of the first driving device to achieve the transmission of the power of the first driving device to the movable sleeve and the driving of the movement thereof.

Further, the first driving means includes a stepping motor.

Further, at least one lens part of the optical lens is provided at a side with at least one second driving means for adjusting the lens part or a lens axial position thereof in a state in which the movable sleeve is extended, which may be provided at a peripheral side of the optical lens for focusing.

Further, the second driving device is at least partially accommodated in the second space.

Further, the lens unit includes an upper limit stop mechanism and a lower limit stop mechanism for limiting the axial movement stroke of the movable sleeve, at least the upper limit stop mechanism is at least partially accommodated in the second space, the upper limit stop mechanism is used for limiting the lens component when the lens is extended to a proper position, and also preventing the lens component from being possibly excessively ejected to strike the cover plate assembly (or the transparent cover plate) or even fall off, and the lower limit stop mechanism is used for limiting the lens component on the image side when the lens component is retracted to prevent the photosensitive assembly (such as an optical filter arranged as the topmost component thereof) from being pressed or bumped to cause damage.

Further, at least one lens part of the optical lens is laterally formed with at least one shoulder protruding radially outwardly with respect to the upper end of the optical lens, and when the movable sleeve performs the retracting movement, the free end of the sleeve protrusion can at least partially abut against the upper side of the shoulder, thereby pushing the lens part of the optical lens to move axially downward until the lower limit stop mechanism is activated.

Further, at least one lens part of the optical lens is laterally provided with at least one second driving means for adjusting the axial position of the lens part or its lens in the state in which the movable sleeve is extended, and the shoulder is constituted by a housing of the second driving means or a part thereof.

Or alternatively, the shoulder is formed on the lens barrel of the lens component.

Further, during the retracting movement of the movable sleeve, after an initial movement of the movable sleeve, the free end of the sleeve projection abuts against the upper side of the shoulder, the distance being available for focusing in the working state, while avoiding the sleeve projection interfering with the movement of the lens element during focusing.

Further, the optical lens includes at least two lens parts, wherein the shoulder is formed at a first lens part, a second lens part is provided below the first lens part, the eject mechanism is provided between the first lens part and the second lens part, and when the movable sleeve performs the projecting movement, the eject mechanism causes a separating movement between the first lens part and the second lens part, and enables an upper side of the shoulder to at least partially abut against a free end of a sleeve projection, thereby pushing the movable sleeve to move axially upward until an upper limit stopper mechanism is activated.

Further, the eject mechanism includes an elastic member capable of driving the first lens part to move away from the second lens part by an elastic pre-force, and a support rod for guiding and supporting the elastic member.

Further, the upper limit stop mechanism comprises a first stop element fixed relative to the first lens component and a second stop element fixed relative to the second lens component, and limiting of the extending length of the lens component by the upper limit stop mechanism is achieved through the mutual limiting function of the two stop elements.

Further, the upper limit stop mechanism can be at least partially received in the second space.

Further, the lower limit stop mechanism includes a lower stop element fixed relative to the fixed base. The lower limit stop mechanism/lower stop element is provided to ensure a proper distance between the optical lens and the upper surface of the photosensitive assembly, while preventing collisions during the lens retracting and/or focusing movements.

Further, the second lens part is fixed to the fixed base, and the lower stopper element is constituted by the second lens part or a part thereof.

Alternatively or additionally, the lens unit is provided with a variable aperture device fixed to an upper end of the optical lens and accommodated in the first space.

According to a second aspect of the present invention, there is provided an image pickup module including:

lens unit as described above, and

the photosensitive assembly comprises a bearing frame, a circuit board and a photosensitive chip attached to the circuit board;

the lens unit is arranged on the bearing frame of the photosensitive assembly through the fixed base of the lens unit.

Further, a first gap exists between the transparent cover plate and the upper end surface of the optical lens, a second gap exists between each lens component and/or each lens of the optical lens, and a third gap exists between the lower end surface of the optical lens and the topmost component of the photosensitive assembly, wherein at least the first gap and the second gap are variable.

Further, when the camera module works, the movable sleeve and the optical lens extend out, at least the first gap and the second gap can be controlled to change between the maximum value and the minimum value of the first gap and the second gap respectively, so that the distance between each lens part and/or each lens of the optical lens relative to the photosensitive chip in the optical axis direction is adjusted, and the focusing function after the optical lens extends out is realized.

Further, the third gap can also be controllably varied between its maximum and minimum values to adjust the distance of each lens element and/or each lens of the optical lens in the optical axis direction relative to the photosensitive chip.

Further, when the camera module is not in operation, the movable sleeve and the optical lens are retracted, and the first gap, the second gap and the third gap can be reduced to and kept to be minimum, so that the optical lens can maintain the most compact containing structure in a standby state.

Further, the minimum value of the second gap is 0.

Further, the photosensitive assembly further includes a filter that constitutes a topmost member of the photosensitive assembly.

Further, the photosensitive assembly further comprises a third driving device which can at least drive the photosensitive chip to move in a plane perpendicular to the optical axis direction so as to realize anti-shake adjustment of the lens.

According to a third aspect of the present invention, there is provided an electronic device, which includes the camera module as described above, and the electronic device may be a portable device such as a smart phone, a tablet computer, or the like.

It goes without saying that the features and advantages of the lens unit provided according to the first aspect of the present invention are equally applicable to the image pickup module provided according to the second aspect of the present invention and the electronic apparatus provided according to the third aspect of the present invention.

Drawings

Some exemplary embodiments of the invention are shown in the drawings. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive. It is further noted that, for clarity of illustration, some of the details of construction in the drawings are not drawn to scale.

FIG. 1 is a schematic cross-sectional view of an image capturing module according to a preferred embodiment of the present invention in an operating state;

FIG. 2 is a schematic cross-sectional view of an image capturing module in a standby state according to a preferred embodiment of the present invention;

FIG. 3 is an exploded view of an image capturing module according to a preferred embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of an image capturing module according to another preferred embodiment of the present invention in an operating state;

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

Fig. 6 is an exploded view of an image capturing module according to another preferred embodiment of the present application.

Detailed Description

The following description is presented to illustrate the application and to enable those skilled in the art to practice the application. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art. The basic principles of the application defined in the following description may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the application. It should also be noted that the features, structures, or characteristics described in connection with a particular embodiment are not necessarily limited to that particular embodiment, nor are they intended to be mutually exclusive with other embodiments, and that it is within the ability of one skilled in the art to implement different combinations of the features of the different embodiments.

The terms "first," "second," and the like in the description and in the claims, are used for distinguishing between different objects and not for describing a particular sequential order. Also, the terms "comprising," "including," and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to only those listed but may optionally include additional steps or elements not listed or inherent to such process, method, article, or apparatus. In the description of the present application, the terms "longitudinal", "transverse", "axial", "radial", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. refer to the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are merely for convenience of describing the present application and simplifying the description, and do not mean that the corresponding devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus the above terms should not be construed as limiting the present application. In addition, the terms "a" or "an" should be understood as "at least one" or "one or more", i.e., in a certain embodiment, the number of a certain element may be one, and in another embodiment, the number of the element may be plural, that is, the term "a" should not be construed as limiting the number.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art and are to be specifically interpreted according to their context in the context of the related art description.

The invention provides a CG (Cover Glass) telescopic scheme, namely when the camera module is in a working state, the telescopic structure is utilized to extend out of CG, and an optical lens is far away from a photosensitive chip by a certain distance through an elastic element arranged at the lens end, so that the TTL requirement of imaging of a large-size (for example, up to one inch or more) chip is met, and the requirement of module shooting is completed; after shooting is completed, the CG is retracted to an initial position by utilizing the telescopic structure, and meanwhile, the distance between the photosensitive chip and the optical lens is compressed, so that the distance between the photosensitive chip and the optical lens is restored to an initial state, and the overall height of the shooting module is reduced in a non-working state. The arrangement mode can effectively solve the inherent contradiction between the imaging quality improvement of the large-size photosensitive chip and the height of the module, so that the terminal equipment provided with the camera module can be thinned, the shooting function of the terminal equipment is realized, the overall aesthetic property of the terminal equipment is improved, the requirements of the market are met, and the use satisfaction of users is improved.

Based on the design thought, after the imaging height-lowering path of the large-size chip is analyzed, the distances of four spaces in the existing module design can be correspondingly optimized, and the following steps are sequentially carried out from large to small according to the height: (1) height H1 of the lens body and compression of the lens gap; (2) the height H2 between the bottom surface of the optical lens and the photosensitive assembly; (3) CG to lens end face distance H3; (4) the height H4 of the photosensitive assembly itself. Through analysis and comparison, the current photosensitive assembly adopts a design mode of photosensitive chips and steel sheets, and the height-reducible distance is limited, so the heights of H1, H2 and H3 are mainly optimized correspondingly, and the main design thinking is as follows: the H1, H2 and H3 meet the imaging distance requirement in the working state, and the distance between the H1, H2 and H3 is compressed to the minimum in the non-working state, so that the height of the device is reduced in the non-working state, and the development trend of thinning of terminal equipment matched with the device is met.

Accordingly, as shown in fig. 1 to 6, the present invention proposes a lens unit 100a including an optical lens 20 including at least one lens member having at least one lens, and a cover assembly including a cover support and a transparent cover 10 fitted thereto, the transparent cover 10 being disposed over the optical lens 20 and coaxially disposed with the optical lens 20. The transparent cover plate 10 is made of a light-permeable material and is used for transmitting light and protecting the optical lens 20, and the area of the transparent cover plate 10 perpendicular to the optical axis direction is larger than the cross section of the light beam entering the optical lens 20, so that when external force acts on the lens unit 100a, the external force acts on the transparent cover plate 10 firstly to protect the optical lens 20, and the reliability of the lens unit and the camera module is improved.

The cover plate support is configured as a movable sleeve 413, which is axially movable in the lens optical axis direction with respect to a fixed base 417 of the lens unit, and includes a sleeve end wall having a sleeve through hole 41342 into which the transparent cover plate 10 is fitted, and a sleeve peripheral wall, the area of which sleeve through hole 41342 perpendicular to the optical axis direction is larger than the cross section of the light beam entering the optical lens, preventing the sleeve support from blocking light. The sleeve peripheral wall extends downwardly at the periphery of the sleeve end wall, the bottom of the sleeve peripheral wall may extend outwardly to form a sleeve movable portion 4132, and the sleeve movable portion 4132 is connected to the first driving device 41.

The cover plate supporting member lifts the transparent cover plate 10 above the optical lens 20, and meanwhile, the movable sleeve 413 may be made of plastic material, which has better compression resistance and damage resistance than glass, so that when external force acts on the telescopic module, the external force acts on the movable sleeve more, and the reliability of the telescopic module is improved.

Wherein the sleeve end wall is configured with a sleeve boss 4134 extending downwardly around the sleeve through hole 41342, a first space is formed centrally inside the sleeve boss 4134, and a second space is formed peripherally between the outside of the sleeve boss 4134 and the inside of the sleeve peripheral wall and below the sleeve boss 4134 and outwardly to the inside of the sleeve peripheral wall. The inner side diameter of the sleeve bulge 4134 is larger than the aperture of the upper end face of the lens, an avoidance space can be reserved for focusing the lens, the upper end face of the first lens component is protected through the first space, and the reliability of the lens unit and the camera module is improved. The optical lens 20 may be at least partially accommodated in the first space with an upper end portion thereof. The second space can be used for placing other parts, saves space, reduces the height of the camera module, and realizes miniaturization of the camera module.

Wherein, the sleeve protrusion 4134 may be configured as a ring protrusion structure or a block structure uniformly distributed in a circumferential direction to form a first space and a second space inside the sleeve.

According to the structural requirement of the present invention, further, the length of the sleeve protrusion 4134 extending downward is smaller than the length of the sleeve peripheral wall extending downward, for example, the length of the sleeve protrusion 4134 extending downward may be selected to be 1/4 to 2/3 of the length of the sleeve peripheral wall extending downward, so as to accommodate lens components and the like inside the movable sleeve 413, effectively forming a separation effect of the internal components thereof from the outside.

According to an embodiment of the present invention, the first space is configured as a cylindrical hole having a diameter D1 larger than the upper end diameter D of the optical lens 20. Preferably, the diameter D1 of the cylindrical hole may be selected to be 1.05 to 2.50 times the diameter D of the upper end portion of the optical lens 20.

Alternatively, the radial dimension of the outside of the sleeve boss 4134 is 1.10 to 1.50 times the diameter of the cylindrical bore.

Preferably, the radial dimension of the outer side of the sleeve protrusion 4134 is gradually reduced from the sleeve end wall to the free end of the sleeve protrusion 4134, so as to form a tapered surface tapering from top to bottom as shown in fig. 1, 2 and fig. 4 and 5, for example, to form a suitable draft angle for manufacturing.

According to the structural requirements of the present invention, the radial dimension of the inner side of the sleeve peripheral wall is larger than the radial dimension of the outer side of the sleeve projection 4134. Preferably, the radial dimension of the inner side of the sleeve peripheral wall may be selected to be 1.10 to 2.00 times the radial dimension of the outer side of the sleeve projection 4134. The sleeve peripheral wall inner side and sleeve boss 4134 outer side thereby form a second space of suitable size for accommodating a motor, stop, etc., as will be further explained below.

According to a preferred embodiment of the present invention, the axial movement of the movable sleeve 413 includes a retracting movement of the movable sleeve 413 closer to the fixed base 417 and an extending movement away from the fixed base 417.

It should be noted that the retracting movement is a downward axial movement, and the extending movement is an upward axial movement.

According to this preferred embodiment of the present invention, further, the lens unit 100a includes at least one first driving means 41 for driving the movable sleeve 413 to perform the retracting movement and at least one ejecting mechanism 30 for pushing the movable sleeve 413 to perform the extending movement.

Further, the first driving device 41 includes a fixed portion fixed to the fixed base 417 and a movable portion connected to the movable sleeve 413. The movable sleeve 413 is configured with at least one actuation connection on the outside of its sleeve circumferential wall, which is connected to the movable part of the first drive means 41. Further, the first driving device 41 includes a stepping motor and a transmission part for transmission.

According to a preferred embodiment of the invention, the actuating connection is a first articulation connection 41321, the stepper motor is used as a drive 41211, and the transmission includes a gear arrangement 41221 and a drive screw 41222. The movable portion is a driving member 413211, which may be a nut member, and is matched with the driving screw 41222, and particularly, the driving member 413211 has an external structure matched with the first movable connecting end 41321, so that the driving member does not rotate relative to the first movable connecting end 41321 during operation. Thus, the first driving device 41 is an actuating structure similar to a "screw nut transmission mechanism". Specifically, the specific construction and operation of the first driving device: the stepper motor serves as a driver 41211 to drive the gear 41221 and drive screw 41222 for rotational movement, and since the driver 413211 is a non-rotatable nut member, the driver 413211 translates axially up and down along the drive screw 41222 to drive the movable sleeve 413 for extending or retracting movement.

According to the above preferred embodiment structure, the guide connection ends are provided at positions radially opposite to the actuation connection ends (the first movable connection ends 41321) on the outside of the sleeve peripheral wall of the movable sleeve 413, and preferably, two guide connection ends, such as the second movable connection end 41322 and the third movable connection end 41323 shown in fig. 3 or 6, may be provided, and the positions of both may be designed according to practical situations, for example, positions radially opposite to each other or positions of other members may not be affected.

According to an embodiment of the present invention, the lens unit 100a includes at least one guide mechanism for guiding the axial movement of the movable sleeve 413. The guide mechanism includes a guide rod 4151 fixed to the fixed base 417 and a guide groove or hole provided to the movable sleeve, the guide rod 4151 being matched to the guide groove or hole, the guide groove or hole being capable of sliding along the guide rod 4151 on the guide rod 4151 when the movable sleeve 413 performs an axial movement. As shown in the structure of fig. 3 or 6, the guide groove or guide hole is formed at the guide connection end (second swing connection end 41322).

According to a preferred embodiment of the invention, at least one lens element of the optical lens 20 is laterally provided with at least one second driving means 42 for adjusting the axial position of the lens element or its lens in the extended state of the movable sleeve 413. The second driving device 42 is especially arranged on the periphery of the optical lens, and is mainly used for focusing during shooting, such as an SMA driving device or a voice coil motor. Further, the second driving device 42 is at least partially accommodated in the second space.

According to a preferred embodiment of the present invention, the lens unit includes an upper limit stop mechanism and a lower limit stop mechanism for limiting the axial movement stroke of the movable sleeve 413, at least the upper limit stop mechanism being at least partially accommodated in the second space.

Further, at least one lens part of the optical lens is laterally formed with at least one shoulder 24 protruding radially outwardly with respect to the upper end of the optical lens, and when the movable sleeve 413 performs the retracting movement, the free end of the sleeve boss 4134 can be at least partially abutted against the upper side of the shoulder 24, thereby pushing the lens part of the optical lens to move axially downward until the lower limit stopper mechanism is activated.

According to a preferred embodiment of the invention shown in fig. 1 and 2, the shoulder 24 is formed on the barrel of the lens component. A gap exists between the lower surface of the sleeve boss 4134 and the convex shoulder 24 of the first lens barrel, a space is reserved for moving the optical lens along the optical axis direction, collision is prevented in the focusing process, the telescoping reliability of the camera module is improved, and meanwhile, the gap can also reserve space for conducting the iris diaphragm device, and the circuit conduction of the iris diaphragm is facilitated.

During the retracting movement of the movable sleeve 413, the free end of the sleeve projection 4134 abuts against the upper side of the shoulder 24 after an initial movement of the movable sleeve 413 a distance. The distance between the free end of the sleeve projection 4134 and the shoulder 24 can thus be used in the operating state for focusing, or in other words to avoid the sleeve projection 4134 interfering with the movement of the lens component in the operating state for focusing, or to avoid collisions of the shoulder 24 with the sleeve projection 4134 in the operating state for focusing.

According to another preferred embodiment of the invention shown in fig. 4 and 5, at least one lens element of the optical lens 20 is laterally provided with at least one second driving means 42 for adjusting the lens element or its lens axial position in the extended state of the movable sleeve 413, the shoulder 24 being constituted by a housing of the second driving means 42 or a part thereof for preventing excessive movement of the optical lens during the extended movement. In the non-working state, the second driving device 42 may be partially accommodated in the second space, so as to reduce the shoulder height of the motor, and further reduce the height of the camera module.

According to an embodiment of the present invention, the optical lens is configured as a split type optical lens, and includes at least a first lens part 21 and a second lens part 22, wherein the shoulder 24 is formed at the first lens part 21, the second lens part 22 is disposed under the first lens part 21, the eject mechanism 30 is disposed between the first lens part 21 and the second lens part 22, and when the movable sleeve 413 performs the protruding movement, the eject mechanism 30 causes a separation movement between the first lens part 21 and the second lens part 22, and enables an upper side of the shoulder 24 to at least partially abut against a free end of the sleeve boss 4134, thereby pushing the movable sleeve to move axially upward until an upper limit stopper mechanism is activated.

Preferably, the eject mechanism 30 includes an elastic member 31 and a support rod 32 for guiding and supporting the elastic member, and the elastic member 31 is capable of driving the first lens part 21 to move away from the second lens part 22 by an elastic pre-force. The elastic member is, for example, a coil spring, and may be sleeved on the support rod 32.

According to an embodiment of the application, the upper limit stop mechanism comprises a first stop element 25 fixed relative to the first lens part 21 and a second stop element 26 fixed relative to the second lens part 22.

In a preferred embodiment as shown in fig. 1 and 2, the first lens component 21 comprises a first barrel and a first lens group, and the second lens component 22 comprises a second barrel and a second lens group. The first lens group is arranged in the first lens barrel, the first lens barrel can be used for protecting the first lens group, the second lens group is arranged in the second lens barrel, and the second lens barrel can be used for protecting the second lens group. The shoulder 24 is integrally formed with the first barrel.

The upper limit stop mechanism comprises a second stop element 26 fixed above the edge of the second lens component 22 and a first stop element 25 fixed below the shoulder 24, the second stop element 26 is higher than the first stop element 25, the second stop element 26 can be of an annular structure, the upper end of the second stop element 26 comprises a protrusion extending towards the axial direction, and the outer edge of the first stop element 25 just abuts against the protrusion position of the second stop element 26 when being capable of moving upwards.

In another preferred embodiment as shown in fig. 4 and 5, the first lens part 21 comprises a first barrel and a first lens group, and the second lens part 22 comprises a second barrel and a second lens group. The first lens group is arranged in the first lens barrel, the first lens barrel can be used for protecting the first lens group, the second lens group is arranged in the second lens barrel, and the second lens barrel can be used for protecting the second lens group.

The first barrel is provided outside with a second driving part 42, which may be one of the AF motors. In this embodiment, the maximum outer diameter of the second lens part 22 is larger than the maximum outer diameter of the second driving device 42, so as to keep the dimension of the lens unit in the x/y direction (i.e. radial direction or perpendicular to the optical axis of the lens) within a small range.

The upper limit stop mechanism comprises a first stop element 25 and a second stop element 26 which are matched with each other, the second stop element 26 is higher than the first stop element 25, the second stop element 26 can be of an annular structure, the bottom of the second stop element 26 is connected to the outer edge of the second lens component 22 or the position where the second lens component 22 is connected with the fixed base 417, the upper end of the second stop element comprises a protrusion extending towards the axial direction, the first stop element can be of an annular structure with an L-shaped section, the diameter of the outer peripheral surface of the first stop element is slightly smaller than the diameter of the inner peripheral surface of the second stop element so as to be suitable for the matched installation of the two, the first stop element can be fixed on the side surface and the bottom surface of the second driving device 42 so as to synchronously move with the first stop element, the second driving part can be protected in the directions X, Y, Z, and the top of the first stop element 25 can be just abutted against the protruding position of the second stop element 26. The lower surface of the first stop member 25 may be provided with a recess inwardly for receiving the support rod 32. The elastic mechanism 30 and the upper limit stop mechanism support the first lens component 22 and the second driving device 42 above the second lens component 22. The second space formed between the outer side of the sleeve protrusion 4134 and the inner side of the movable sleeve 413 can accommodate the second stopper element 26, saving space, and making the camera module more compact.

In any of the above embodiments, the first stop member 25 is disposed between the ejector mechanism 30 and the shoulder 24, and a lower surface of the first stop member 25 may be provided with a recess inward for accommodating the support rod 32 of the ejector mechanism 30.

As shown in fig. 5, in this embodiment, the second stopper element 26 may extend at least partially between the outside of the sleeve boss 4134 and the inside of the sleeve peripheral wall in a state where the movable sleeve 413 is retracted (corresponding to the standby state).

By the cooperation of the first and second stopper elements, it is possible to effectively stop and limit the first lens part 21 and the second driving device 42 when they are sprung upward.

In this embodiment, the lower limit stop mechanism includes a lower stop element 27 fixed relative to the fixed base 417.

Under the concept of the present invention, a lower limit stop mechanism/lower stop element 27 is provided to ensure a proper distance between the optical lens (particularly the second lens part 22 thereof) and the photosensitive assembly 100b or the optical filter, while preventing collision between the two during the lens retracting motion and/or the focusing motion.

In the present embodiment, the second lens component 22 is fixed to the fixed base 417, and the lower stopper element 27 is constituted by the second lens component 22 or a part thereof.

According to any one of the embodiments of the present invention, the lens unit may be provided with a variable aperture device 70 fixed to an upper end of the optical lens 20 and accommodated in the first space. For this, see the embodiment shown in fig. 1-3. Of course, in the embodiment of fig. 4-6, such iris diaphragm arrangements may be provided accordingly, depending on the particular design and use requirements.

The iris device 70 includes an iris fixing portion, an iris blade, an iris driving portion, and an iris electrical connection portion, where the iris fixing portion is fixed to the upper surface and the side wall of the first barrel, the iris blade of the iris extends inward to above the first lens member 21, and the iris blade is located on the light entrance path of the lens unit, for changing the aperture size of the iris, so as to adjust the light entrance amount of the lens unit, and the iris is disposed on the upper end surface of the first lens member. Due to the arrangement of the shoulder 24 (the upper surface platform of the first lens barrel bulge), an accommodating space is formed at the position, and the iris diaphragm device is arranged in the accommodating space, so that the iris diaphragm can be sunk to the side edge of the first lens barrel from the upper surface part of the first lens barrel, the heights of the lens unit and the camera module are reduced, and the overall structure is more compact. The sleeve boss 4134, the transparent cover plate 10 and the first lens barrel together form an accommodating space, and part of the first lens component 21 and the iris diaphragm device 70 are disposed in the accommodating space, and the accommodating space can reserve a movable space for the iris diaphragm device 70, and can protect the lens end face and the iris diaphragm device, so as to improve the reliability of the lens element and the camera module.

The height of the sleeve boss 4134 along the optical axis direction is greater than the height of the iris diaphragm along the optical axis direction, so that a gap exists between the upper surface of the iris diaphragm and the transparent cover plate 10, and the iris diaphragm and the transparent cover plate 10 are prevented from colliding in the subsequent telescopic process during working, so that the lens unit is damaged. A gap exists between the outer side of the iris diaphragm and the inner side of the sleeve boss 4134, so that a space is reserved for deformation of the iris diaphragm during operation.

The invention also provides an image pickup module 100, which comprises the lens unit 100a and a photosensitive assembly 100b, wherein the photosensitive assembly 100b comprises a bearing frame, a circuit board 61 and a photosensitive chip 62 attached to the circuit board 61; wherein, the lens unit is mounted on the carrier of the photosensitive assembly 100b via its fixing base 417.

According to an embodiment of the present invention, a first gap S1 exists between the transparent cover plate 10 and the upper end surface of the optical lens 20, a second gap S2 exists between each lens component and/or each lens of the optical lens 20, and a third gap S3 exists between the lower end surface of the optical lens 20 and the topmost member of the photosensitive assembly 100b, wherein at least the first gap S1 and the second gap S2 are variable. The third gap S3 can also be controllably varied between its maximum and minimum values to adjust the distance of the lens components and/or lenses of the optical lens 20 in the optical axis direction relative to the photosensitive chip 62.

Specifically, referring to fig. 1 and 2 or fig. 4 and 5, for example, a first gap S1 is formed between the transparent cover plate 10 and the upper end surface of the first lens member 21, a second gap S2 is formed between the first lens member 21 and the second lens member 22, and a third gap S3 is formed between the second lens member 22 and the photosensitive assembly 100 b.

When the camera module is in operation, the movable sleeve 413 and the optical lens 20 are extended, and at least the first gap S1 and the second gap S2 can be controllably changed between their respective maximum and minimum values to adjust the distances between the first lens component 21 and the second lens component 22 in the optical axis direction relative to the photosensitive chip 62, so as to achieve focusing on the basis of the structure of the present invention.

When the camera module is not in operation, the movable sleeve 413 and the optical lens 20 are retracted, and the first gap S1, the second gap S2 and the third gap S3 can be reduced to and kept to be minimum, so as to realize a compact storage structure.

Preferably, the minimum value of the second gap S2 is 0.

Additionally, the photosensitive assembly 100b further includes a filter that forms a topmost member of the photosensitive assembly 100 b. Preferably, the photosensitive assembly 100b further includes a third driving device 50, at least capable of driving the photosensitive chip 62 to move in a plane perpendicular to the optical axis direction, where the third driving device 50 is mainly a photosensitive chip anti-shake assembly, and includes a chip anti-shake fixing portion, a chip anti-shake movable portion, a driving member SMA, and the like, where the chip anti-shake movable portion is connected to the photosensitive assembly, and when the photosensitive chip movable portion moves relative to the fixing portion, the photosensitive chip is driven to move, so as to implement an anti-shake (OIS) function of the photosensitive chip. For this, see the embodiments shown in fig. 4-6. Of course, in the embodiment shown in fig. 1-3, such a third driving device may be correspondingly configured to implement the anti-shake function, depending on the specific design and use requirements.

Besides, the photosensitive assembly 100b further includes an electronic component, etc., the photosensitive chip 62 is fixed on the upper surface of the circuit board and is electrically connected with the circuit board, the electronic component is distributed on the side of the photosensitive chip 62, and the electronic component and the portion of the photosensitive chip 62 connected with the circuit board 61 are molded by the same molding process, and the section of the molded base formed by the molding base is provided with an optical filter mounting position, that is, the molded base molds the electronic component inside the molded base, so that the overall height of the photosensitive assembly can be effectively reduced.

As an example, the following describes the operation of the two embodiments illustrated in detail, based on the corresponding structures of the respective components described above.

(one) A preferred embodiment is shown in FIGS. 1 and 2

(i) The camera module enters the working state shown in figure 1 from the standby state shown in figure 2

The ejector mechanism 30 causes a separation movement between the first lens part 21 and the second lens part 22, the optical lens 20 then being moved upwards along the optical axis and the upper side of the shoulder 24 being enabled to at least partly abut against the free end of the sleeve projection 4134, thereby pushing the movable sleeve 413 upwards in the axial direction, performing an extending movement until the top of the first stop element 25 abuts against the second stop element 26, i.e. the upper limit stop mechanism is active. In this process, the maximum stroke achievable by the movable sleeve 413 through the first driving device 41 is L1, the first lens part 21 of the optical lens can axially move relative to the second lens part 22 through the action of the ejecting mechanism, and the maximum stroke is L2; the variable range of the first gap S1 between the transparent cover plate 10 and the upper end surface of the first lens part 21 of the optical lens is Δs1; the second gap S2 between the first lens component 21 and the second lens component 22 increases, and the variable range is Δs2, which can take a value between 0 and L2; the second lens component 22 can move axially relative to the fixed base 417, so that the third gap S3 between the lower end surface of the second lens component 22 and the optical filter can also be changed by the second driving device 42.

(ii) The camera module enters a standby state shown in fig. 2 from the working state shown in fig. 1

The driving device 41211 (stepper motor) of the first driving device 41 drives the driving screw 41222 to rotate through the gear device 41221, and the driving member 413211 performs a translational movement downward along the optical axis direction along the driving screw 41222, driving the movable sleeve 413 to axially move relative to the fixed base 417, performing a retracting movement. During the retracting movement of the movable sleeve 413, after an initial movement of the movable sleeve 413 a distance, the free end of the sleeve projection 4134 abuts against the upper side of the shoulder 24, thereby pushing the first lens part 21 of the optical lens axially downwards until the bottom of the second lens part 22 abuts against the lower stop element 27, i.e. the lower limit stop mechanism is active.

(II) another preferred embodiment shown in FIGS. 4 and 5

(i) The camera module enters the working state shown in fig. 4 from the standby state shown in fig. 5

The ejector mechanism 30 causes a separation movement between the first lens part 21 and the second lens part 22, the optical lens 20 moves upwards along the optical axis, and the upper side of the second driving device 42 pushes the free end of the sleeve protrusion 4134, so that the first lens part 21 and the movable sleeve 413 move upwards along the axial direction, and the extending movement is performed until the top of the first stop element 25 abuts against the second stop element 26, that is, the upper limit stop mechanism acts. In this process, the maximum stroke achievable by the movable sleeve 413 through the first driving device 41 is L1, the first lens part 21 of the optical lens can axially move relative to the second lens part 22 through the action of the ejecting mechanism, and the maximum stroke is L2; the variable range of the first gap S1 between the transparent cover plate 10 and the upper end surface of the first lens part 21 of the optical lens is Δs1; the second gap S2 between the first lens component 21 and the second lens component 22 increases, and the variable range is Δs2, which can take a value between 0 and L2; the second lens component 22 can move axially relative to the fixed base 417, so that the third gap S3 between the lower end surface of the second lens component 22 and the optical filter can also be changed by the second driving device 42.

In this embodiment, since the first lens component 21 moves up and down along the optical axis to perform focusing, the second driving device 42 does not move along with focusing when the first lens component 21 focuses, so that a space is not required between the lower surface of the sleeve protrusion 4134 and the upper surface of the second driving device 42, and the sleeve protrusion 4134 abuts against the second driving device 42 to move together.

(ii) The camera module enters a standby state shown in fig. 5 from the working state shown in fig. 4

The driving device 41211 (stepper motor) of the first driving device 41 drives the driving screw 41222 to rotate through the gear device 41221, and the driving member 413211 performs a translational movement downward along the optical axis direction along the driving screw 41222, driving the movable sleeve 413 to axially move relative to the fixed base 417, performing a retracting movement. During the retracting movement of the movable sleeve 413, the free end of the sleeve projection 4134 of the movable sleeve 413 abuts against the upper side of the shoulder 24, thereby pushing the first lens part 21 of the optical lens axially downwards, the first lens part 21 approaching the second lens part 22, the second driving means 42 depressing the first stop element 25, thereby axially compressing the ejector mechanism 30 until the bottom of the second lens part 22 abuts against the lower stop element 27, i.e. the lower limit stop mechanism is active. When not in working condition, the distance among H1, H2 and H3 can be compressed to minimum, the height of the camera module in the not working condition is reduced, the camera module structure is more compact, and the development trend of lightening and thinning of terminal equipment matched with the camera module is met.

According to the CG telescopic module designed by the scheme, the CG cover plate is driven by the stepping motor to stretch along the optical axis direction, and the CG cover plate is matched with the elastic component and the supporting rod which are arranged between the optical lenses, when the module is in a working state, the CG is driven by the stepping motor to rise along the optical axis direction, and under the action of the elastic component, the distance between the optical lenses is increased so as to meet the TTL requirement of imaging; after shooting is completed, the stepping motor drives the CG to move along the direction opposite to the optical axis, so that the CG compresses the distance between the first lens assembly and the second lens assembly, the CG returns to an initial state, the whole height is kept to be reduced, and a shooting process is realized.

Meanwhile, in a specific shooting process, when the TTL of the optical lens meets the imaging requirement of a large-size chip, in order to further improve the imaging quality, a second driving element arranged on the optical lens, namely an AF motor, is utilized to realize focusing, so that a shot photo is clearer; the shake in the photographing process is corrected by using a third driving element, i.e., a chip anti-shake motor, provided at the end of the photosensitive chip, and a high-quality photographing process has been completed. Namely, the CG telescopic module provided by the scheme solves the contradiction between the large-size chip and the height of the module by utilizing the first driving element, so that the whole module can be kept miniaturized; the second driving element is used for solving the focusing position in the imaging process of the large-size chip, only part of the optical lens is driven to focus, the driving force requirement is reduced, and meanwhile the shooting definition problem is solved; the anti-shake problem of the large-size chip is solved by utilizing the third driving element, and the driving element is only arranged at the photosensitive chip end of the camera module, so that the camera module only drives the photosensitive chip to move, and the anti-shake is realized relative to the whole optical lens, so that the anti-shake requirement can be met under the condition of providing smaller driving force, and the miniaturization can be realized.

In summary, the CG telescopic module provided by the present solution can provide a better solution for imaging of large-size chips, and accords with the development trend of the current camera module.

The invention also provides an electronic device, which comprises an electronic device main body and at least one camera module 100 arranged on the electronic device main body, wherein the camera module 100 has the same structure and function as the telescopic module in the above preferred embodiment. The camera module is mounted on the electronic equipment main body and can be used as a front camera lens or a rear camera lens of the electronic equipment. Alternatively, in the preferred embodiment of the present invention, the electronic device may be, but is not limited to, a mobile phone, a computer, a tablet computer, and other photographing devices having photographing functions, such as a smart wearable device, a monitoring device, and the like.

Although exemplary embodiments of the present invention have been described above, it will be understood by those skilled in the art that various changes and modifications may be made to the exemplary embodiments of the present invention without departing from the spirit and scope of the invention, and all such changes and modifications are intended to be included within the scope of the present invention.

The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.

Claims

1. A lens unit, comprising:

an optical lens comprising at least one lens element with a lens, and

wherein the cover plate support is configured as a movable sleeve that is axially movable in the lens optical axis direction with respect to the fixed base of the lens unit, and includes:

Wherein a sleeve projection extending downward around the through hole is formed on the sleeve end wall, the length of the sleeve projection extending downward is smaller than the length of the sleeve peripheral wall extending downward, a first space is formed in the center inside the sleeve projection, a second space is formed in the periphery between the outside of the sleeve projection and the inside of the sleeve peripheral wall and below the sleeve projection and outward to the inside of the sleeve peripheral wall, and the optical lens is accommodated in the first space at least partially with the upper end portion thereof.

2. The lens unit according to claim 1, wherein the first space is configured as a cylindrical hole having a diameter larger than a diameter of an upper end portion of the optical lens.

3. A lens unit according to claim 1 or 2, wherein the axial movement of the movable sleeve includes a retracting movement of the movable sleeve closer to the fixed base and an extending movement of the movable sleeve away from the fixed base.

4. A lens unit according to claim 3, characterized in that the lens unit comprises at least one first driving means for driving the movable sleeve to perform the retracting movement and at least one ejector mechanism for pushing the movable sleeve to perform the extending movement.

5. The lens unit according to claim 4, wherein the first driving means includes a movable portion connected to the movable sleeve.

6. A lens unit according to claim 5, wherein the movable sleeve is configured with at least one actuation connection end on an outer side of a sleeve peripheral wall thereof, the actuation connection end being connected to the movable portion of the first driving device.

7. The lens unit according to claim 4, wherein the first driving means includes a stepping motor.

8. A lens unit according to any one of claims 3 to 7, characterized in that at least one lens part of the optical lens is laterally provided with at least one second driving means for adjusting the axial position of the lens part or its lens in the state in which the movable sleeve is extended.

9. The lens unit according to claim 8, wherein the second driving device is at least partially accommodated in the second space.

10. A lens unit according to any one of claims 3 to 7, wherein the lens unit comprises an upper limit stop mechanism and a lower limit stop mechanism for defining the axial movement stroke of the movable sleeve, at least the upper limit stop mechanism being at least partially accommodated in the second space.

11. A lens unit according to any one of claims 3 to 7, wherein at least one lens part of the optical lens is laterally formed with at least one shoulder projecting radially outwards with respect to the upper end of the optical lens, the free end of the sleeve projection being capable of at least partially abutting against the upper side of the shoulder when the movable sleeve performs the retracting movement, thereby pushing the lens part of the optical lens axially downwards until the lower limit stop mechanism is active.

12. Lens unit according to claim 11, characterized in that at least one lens part of the optical lens is laterally provided with at least one second drive means for adjusting the axial position of the lens part or its lens in the extended state of the movable sleeve, the shoulder being constituted by the housing of the second drive means or a part thereof.

13. The lens unit according to claim 11, wherein the shoulder is formed on a barrel of the lens member.

14. The lens unit according to any one of claims 11 to 13, wherein a free end of the sleeve projection abuts against an upper side of the shoulder after the movable sleeve is initially moved a distance during the retracting movement of the movable sleeve.

15. A lens unit according to any one of claims 11 to 14, wherein the optical lens comprises at least two lens parts, wherein the shoulder is formed on a first lens part, a second lens part is provided below the first lens part, the ejector mechanism is provided between the first lens part and the second lens part, and when the movable sleeve performs the projecting movement, the ejector mechanism causes a separating movement between the first lens part and the second lens part and enables an upper side of the shoulder to at least partially abut against a free end of a boss of the sleeve, thereby pushing the movable sleeve to move axially upwards until an upper limit stop mechanism is active.

16. The lens unit according to claim 15, wherein the eject mechanism includes an elastic member capable of driving the first lens part to move away from the second lens part by an elastic pre-force, and a support rod for guiding and supporting the elastic member.

17. A lens unit according to claim 15 or 16, wherein the upper limit stop mechanism comprises a first stop element fixed relative to the first lens part and a second stop element fixed relative to the second lens part.

18. The lens unit of claim 17, wherein the upper limit stop mechanism is at least partially receivable in the second space.

19. The lens unit according to any one of claims 11 to 18, wherein the lower limit stop mechanism includes a lower stop element fixed relative to the fixed base.

20. A lens unit according to claim 19, wherein the second lens part is fixed to the fixed base, and the lower stopper element is constituted by the second lens part or a part thereof.

21. The lens unit according to any one of claims 1 to 20, characterized in that the lens unit is provided with a variable aperture device that is fixed to an upper end of the optical lens and is accommodated in the first space.

22. A camera module, comprising:

the lens unit according to any one of claims 1 to 21, and

23. The imaging module of claim 22, wherein a first gap exists between the transparent cover plate and the upper end surface of the optical lens, a second gap exists between each lens element and/or each lens of the optical lens, and a third gap exists between the lower end surface of the optical lens and the topmost member of the photosensitive assembly, wherein at least the first and second gaps are variable.

24. An imaging module according to claim 23, wherein, in operation of the imaging module, the movable sleeve and the optical lens are extended, at least the first and second gaps being controllably variable between their respective maximum and minimum values to adjust the distance of the lens elements and/or lenses of the optical lens relative to the light-sensing chip in the direction of the optical axis.

25. The imaging module of claim 24, wherein the third gap is also controllably variable between its maximum and minimum values to adjust the distance of the lens elements and/or lenses of the optical lens relative to the photosensitive chip in the direction of the optical axis.

26. The camera module of claim 23, wherein the first, second and third gaps are minimized and maintained by retracting the movable sleeve and the optical lens when the camera module is not in operation.

27. The camera module of any of claims 23 to 26, wherein the minimum value of the second gap is 0.

28. The camera module of any of claims 23 to 27, wherein the photosensitive assembly further comprises a filter that forms a topmost member of the photosensitive assembly.

29. The camera module of any one of claims 22 to 28, wherein the photosensitive assembly further comprises a third driving device capable of driving at least the photosensitive chip to move in a plane perpendicular to the optical axis direction.

30. An electronic device comprising the camera module of any one of claims 22 to 29.