CN113946026A - Lens assembly, assembling method thereof and camera module comprising lens assembly - Google Patents
Lens assembly, assembling method thereof and camera module comprising lens assembly Download PDFInfo
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- CN113946026A CN113946026A CN202010689733.6A CN202010689733A CN113946026A CN 113946026 A CN113946026 A CN 113946026A CN 202010689733 A CN202010689733 A CN 202010689733A CN 113946026 A CN113946026 A CN 113946026A
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- thread
- organic solvent
- barrel
- lens barrel
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 239000003960 organic solvent Substances 0.000 claims abstract description 98
- 239000000463 material Substances 0.000 claims abstract description 34
- 230000002093 peripheral effect Effects 0.000 claims description 30
- 239000002344 surface layer Substances 0.000 claims description 16
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 13
- 239000002207 metabolite Substances 0.000 claims description 12
- 239000002904 solvent Substances 0.000 claims description 11
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 10
- 239000011248 coating agent Substances 0.000 claims description 10
- 238000000576 coating method Methods 0.000 claims description 10
- 230000004323 axial length Effects 0.000 claims description 7
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 230000008961 swelling Effects 0.000 claims description 6
- 239000012046 mixed solvent Substances 0.000 claims description 5
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 3
- 150000008280 chlorinated hydrocarbons Chemical class 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 230000004927 fusion Effects 0.000 claims 1
- 239000003292 glue Substances 0.000 description 14
- 230000013011 mating Effects 0.000 description 8
- 239000000428 dust Substances 0.000 description 7
- 230000007547 defect Effects 0.000 description 5
- 229920000106 Liquid crystal polymer Polymers 0.000 description 4
- 239000004977 Liquid-crystal polymers (LCPs) Substances 0.000 description 4
- 239000012876 carrier material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000004026 adhesive bonding Methods 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
Abstract
The application relates to a lens assembly, an assembling method thereof and a camera module comprising the lens assembly. The lens assembly comprises a lens main body and a lens bearing seat, wherein at least part of a matching part between the lens barrel and the lens bearing seat is coated with an organic solvent, and the organic solvent can contact with materials of the lens barrel and/or the lens bearing seat to react so that the lens barrel and the lens bearing seat are stably positioned and jointed with each other.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a lens assembly, an assembling method of the lens assembly and a camera module.
Background
In conventional camera modules, the lens assembly is typically fixed in a carrier. The lens and the lens carrier of the mobile phone camera module are usually designed to be in a thread engagement structure, and the lens component and the carrier are fixedly combined in a screwing way through threads. However, due to the influence of the materials of the lens and the lens carrier, the first thread on the lens and the second thread on the lens carrier cannot be completely matched, and are slightly eccentric, so that excessive friction is easily caused when the threads are occluded to generate debris dust points, and the dust points fall on the surface of the optical filter above the lens base, so that stains appear when the camera module is used for shooting, the image quality of output is influenced, and normal shooting is influenced.
In the middle of the actual production, the dislocation of often inevitably taking place to misplace with the helicitic texture equipment of carrier closes soon, and the dislocation closes soon can produce the piece, then causes the dirty scheduling problem of the module of making a video recording. In addition, during the screwing process, the partial threads are excessively clamped and the partial threads are not clamped, so that a gap exists between the lens and the carrier, and the lens assembly inclines.
Because the lens cone closes the length soon longer when setting up to the full thread, and the number of turns is more, closes the in-process soon and produces a large amount of pieces easily and pollute the lens, so in prior art, the screw on the camera lens subassembly can not set up to the full thread usually, and the camera lens subassembly leaves the gap with the carrier terminal surface, under this condition, for better fixed camera lens subassembly, fills glue in the gap usually. However, the glue itself has a certain thickness, and the shrinkage of the glue after curing is also likely to cause the lens to tilt. Therefore, after the glue is cured, due to the fact that the shrinkage of the glue at different positions is not uniform, and in addition, the threads are dislocated and screwed, and part of the threads are not screwed, the inclination of the lens assembly is further aggravated, and the assembly quality of a product is difficult to control.
CN107065120A discloses a camera module and a method for mounting the camera module, in which a damping grease is applied to the threaded connection between the lens and the base, so as to prevent the lens and the base from generating chips due to thread friction during assembly, and to prevent the lens from loosening during use. CN201765370U of the present applicant discloses a mobile phone camera module, wherein a colloid is coated on the screw-thread matching position of the lens and the lens holder, and dust generated by screw-thread friction is adhered through the colloid, so as to prevent the dust from falling into the photosensitive area and affecting the imaging quality. Although the above measures can solve the problem of dust prevention and dust separation of the lens assembly/camera module to a certain extent, the application of the additional material complicates the assembly process, and on the other hand, the phenomena of unstable and inaccurate positioning (for example, inclination of the lens assembly) caused by the defect of the clamping of the thread structure itself still exist.
In summary, those skilled in the art need to solve the above-mentioned problems by improving the prior art to reduce the tilt of the lens assembly, reduce the thread chipping, and avoid the dust from falling on the filter to affect the shooting.
Disclosure of Invention
The invention aims to optimize the assembly process and the finished product quality of a lens assembly, and provides the lens assembly, an assembly method of the lens assembly and a camera module comprising the lens assembly.
According to an aspect of the present invention, there is provided a lens assembly including:
the lens body consists of a lens barrel and at least one optical lens arranged in the lens barrel; and
the lens body is fixedly arranged in the lens bearing seat through the lens barrel;
the lens barrel is characterized in that the matching part between the lens barrel and the lens bearing seat is at least partially coated with an organic solvent, and the organic solvent can contact with the material of the lens barrel and/or the lens bearing seat to react, so that the lens barrel and the lens bearing seat are stably positioned and combined with each other.
Generally, the material of the lens barrel and the lens bearing seat can be selected from one or more of PC, PP and LCP.
According to some embodiments of the invention, the organic solvent is a miscible solvent capable of swelling and dissolving the material of the lens barrel and/or lens holder. The organic solvent can swell (swelling is the phenomenon that the volume of the high polymer in the solvent expands) and dissolve the materials of the lens barrel and/or the lens bearing seat, the volume of the matching structure (such as a thread) on the lens barrel and the matching structure (such as a thread) on the lens bearing seat can expand, the matching gap becomes smaller after expansion, when the part coated by the organic solvent has no gap, the two are contacted with each other, the stability of the materials after dissolution is weakened, the activity of the molecular chains is enhanced, the molecular chains of the two are rearranged and combined after contact, and then the lens barrel and the lens bearing seat are combined into a whole at the contact part.
The mixed solvent may comprise DMF and THF components, or chloroform and THF components, or toluene and THF components. For example, depending on the material of the corresponding lens barrel and/or lens holder, the mixed solvent may be composed of DMF: THF 1:1 to 1:25, or chloroform: THF 3:5 to 3:10.6, or toluene: THF 2:3 to 2:20, in consideration of the reaction result or product required in the process, reaction sensitivity, reaction time, and the like.
According to some embodiments of the invention, the organic solvent is a corrosive solvent capable of corroding the material of the lens barrel and/or lens holder and producing a viscous metabolite. Here, the corrosive material may corrode the mating structure (e.g., threads) on the lens barrel and the mating structure (e.g., threads) on the lens holder at the same time, or corrode only one of them, which may cause them to dissolve or swell and produce a viscous metabolite, which may penetrate into the crevices of the mating structure (e.g., threads) that have not corroded, where the lens barrel and the lens holder are bonded together.
The corrosive solvent can be selected from one or more of acetone, aromatic hydrocarbon organic solvent and chlorinated hydrocarbon.
According to a preferred embodiment of the invention, the organic solvent is a liquid, and the amount applied is suitably from 0.5 to 10 microliters.
According to some embodiments of the invention, the lens assembly is for a fixed focus camera module (FF module) and comprises a lens carrier constituting the lens carrier.
According to some embodiments of the invention, the lens arrangement is used for an autofocus camera module (AF module) and comprises a drive arrangement, in particular having a motor and a motor carrier, which in this case forms the lens holder.
According to some embodiments of the present invention, the lens barrel of the lens body has a cylindrical shape, the lens holder has a recess for accommodating the lens barrel, the outer peripheral wall of the lens barrel is provided with a first thread, the inner peripheral wall of the recess is provided with a second thread corresponding to the first thread, and the organic solvent is at least partially applied to a screwing portion of the first thread and the second thread.
Advantageously, the axial extension length of the first thread on the outer peripheral wall of the lens barrel covers only a part of the axial total length of the lens barrel, and the section provided with the first thread is located in the middle of the axial total length of the lens barrel, and the second thread is arranged at the corresponding section of the inner peripheral wall of the concave hole of the lens bearing seat with the axial extension length corresponding to the first thread, so that the lens barrel and the lens bearing seat are in a predetermined relative position after being screwed and installed through the first thread and the second thread.
Here, the above-mentioned way of setting the screw threads on the lens barrel and the lens holder is considered that: if the screw thread is arranged on the lower part of the lens main body (or the lens barrel thereof) close to the optical filter, the optical filter component is easy to impact or pollute; if the screw thread is disposed on the upper portion of the lens body (or the lens barrel thereof) away from the optical filter, the first screw thread on the lens barrel may not be screwed completely due to an error in the module assembly process, which may affect the appearance of the product.
Moreover, because the length of the lens barrel is long when the lens barrel is set to be full thread, the number of turns is large, and a large amount of scraps are easily produced in the screwing process to pollute the lens, the thread on the lens component cannot be set to be full thread usually.
Preferably, the section provided with the first thread occupies 1/4 to 2/3 of the total axial length of the lens barrel.
According to some embodiments, the organic solvent may be applied circumferentially around the first thread and/or the second thread.
According to further embodiments, the organic solvent may be applied to the first thread and/or the second thread in a plurality of sections in a circumferential direction, and the sections to which the organic solvent is applied are uniformly spaced apart in the circumferential direction.
The first and second threads may be single triangular threads or circular arc threads. According to specific needs, the standard metric triangular thread is selected to be convenient to process and manufacture, and the circular arc thread is selected to achieve better thread connection strength and sealing performance.
Advantageously, the first thread and the second thread have an axial extension of 0.20mm to 0.40mm, for example 0.25mm or 0.30 mm; and/or the total number of threads of the first and second threads may be 2-4, preferably 2.5, respectively. Therefore, the positioning requirement and the connection strength between the lens main body and the lens bearing seat can be met.
Preferably, the number of the screw threads which are reacted by contacting the first screw thread and the second screw thread with the organic solvent is 1.5 to 2.5.
Advantageously, the organic solvent is applied to the thread surface of the first thread and/or the second thread such that only the thread surface material reacts with the organic solvent. The organic solvent is coated on the thread surface layer, and the thread is not completely dissolved, the thread surface layer is swelled and dissolved by the organic solvent at the moment, or the thread surface layer is corroded to generate viscous metabolites at the moment, and the part which is not coated/contacted with the organic solvent can still be screwed in the thread, so that the alignment function is realized, and the lens barrel and the lens bearing seat can be positioned and jointed in a correct relative position.
Under the framework of the invention, the key points of the technical scheme comprise: organic solvent is adopted to react with the lens cone and/or the carrier material to bond the two. Based on this idea, the connection fit between the lens body (or the lens barrel thereof) and the lens holder is not limited to a threaded structure, and for example, a shaft hole (without threads) fit is also conceivable, and it can be specified that: the lens barrel of the lens main body is in a cylindrical shape, the lens bearing seat is provided with a concave hole for accommodating the lens barrel, a shaft hole clearance fit is formed between the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole, and the organic solvent is at least partially coated on the clearance fit part of the shaft hole; preferably, the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole form the axial hole clearance fit only on a part of the axial total length of the lens barrel, and the section forming the axial hole clearance fit is positioned in the middle of the axial total length of the lens barrel; preferably, the section forming the shaft hole clearance fit accounts for 1/4-2/3 of the total axial length of the lens barrel. The cone end centering and positioning measures are additionally adopted, namely, in the front end area of the concave hole, the lens barrel is installed, a conical surface fit is formed between the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole, so that the lens barrel and the lens bearing seat can be automatically centered and axially positioned when being plugged into each other, and then the lens barrel and the lens bearing seat are in a preset relative position after being installed, wherein the axial extension length of the conical surface fit preferably accounts for 1/4-1/3 of the total axial length of the lens barrel, and the conicity of the conical surface formed on the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole at the conical surface fit position can be 1: 1-1: 3. Also, it is possible that the organic solvent is circumferentially applied all around to the shaft-hole clearance fit portion on the outer circumferential wall of the lens barrel and/or the inner circumferential wall of the concave hole; or the organic solvent is coated on the shaft hole clearance fit part on the outer peripheral wall of the lens barrel and/or the inner peripheral wall of the concave hole in a plurality of sections in the circumferential direction, and the sections coated with the organic solvent are uniformly distributed at intervals along the circumferential direction.
Accordingly, according to another aspect of the present invention, there is provided a lens assembly assembling method, including the steps of:
-providing a lens body and a lens carrier;
-fitting the barrel of the lens body into the recess of the lens holder and locking the two in engagement with each other;
-at least partially coating an organic solvent at a mating portion between the lens barrel and the lens holder;
the material of the barrel and/or the lens holder reacts with the organic solvent to integrate the barrel and the lens holder.
In view of the above-mentioned embodiment of adopting the threaded connection between the lens body (or the lens barrel thereof) and the lens bearing seat, the present invention provides an assembling method of the lens assembly, which includes the following steps:
(A) providing a lens main body and a lens bearing seat;
(B) the front end of the lens cone is arranged in a concave hole of the lens bearing seat, and the first thread and the second thread are screwed and locked;
(C) at least partially coating an organic solvent on the screwing part of the first thread and the second thread;
(D) the first thread and/or the second thread surface layer material reacts with the organic solvent to combine the lens barrel and the lens bearing seat into a whole.
According to some embodiments of the present invention, in the step (C), the coating amount of the organic solvent is at least 0.5 μ l, so that the organic solvent penetrates into the fitting gap between the lens barrel and the lens holder at the screw portion. In this case, the organic solvent advantageously enters the fitting gap between the lens barrel and the lens holder at the screw-in position and contacts the first thread and the second thread surface layer by gravity and the fluidity of the liquid.
According to some embodiments of the present invention, in the step (D), after the first thread and/or the second thread surface layer is swelled and dissolved by the organic solvent, the molecular chains are rearranged and combined, and the lens barrel and the lens holder are melt-bonded.
According to some embodiments of the present invention, in the step (D), the first thread and/or the second thread is/are corroded by the organic solvent to generate a viscous metabolite, so as to adhesively bond the lens barrel and the lens holder.
According to another aspect of the present invention, there is provided a camera module, which includes a photosensitive component and a light-transmitting component, wherein the light-transmitting component includes the lens component as described above.
Compared with the prior art, the assembling process and the finished product quality of the lens assembly/camera module are improved, and particularly, the technical scheme provided by the application can realize at least one following beneficial technical effect:
(1) the organic solvent is utilized to react (swell/dissolve or corrode) with the lens cone and/or the lens bearing seat material, so that the lens main body (or the lens cone) and the lens bearing seat are bonded into a whole, the process is simple, and the cost is low;
(2) the organic solvent can dissolve scraps generated during component assembly, particularly screwing, so that the optical element is prevented or reduced from being polluted by the scraps, and the product quality is improved;
(3) the binding force between the lens main body and the lens bearing seat is increased, and the two are ensured to be stably positioned;
(4) the problem of inclination of the lens assembly caused by contraction of glue is avoided or reduced, and the lens main body and the lens bearing seat are ensured to be in the correct relative position.
Drawings
In which some exemplary embodiments of the invention are shown. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive. It is also noted that for purposes of clarity of illustration, certain features are not necessarily drawn to scale in the drawings.
FIG. 1 is a cross-sectional view of a prior art lens assembly assembled by screw-fitting and gluing; FIG. 1A shows a defect of thread misalignment in a partially enlarged cross-sectional view; FIG. 1B is a partial enlarged sectional view showing a defect of lens tilt when the screw thread is partially not engaged/excessively engaged;
FIG. 2 is a cross-sectional view of a lens assembly according to an embodiment of the invention;
fig. 3 is a cross-sectional view of a lens body of a lens assembly according to an embodiment of the present invention, showing the arrangement of screw threads and an organic solvent on the outer circumferential surface of a lens barrel;
fig. 4A and 4B are schematic cross-sectional views of the lens barrel, which respectively show different coating patterns of the organic solvent in the circumferential direction;
fig. 5 is a schematic cross-sectional view of a camera module (FF module) according to an embodiment of the invention;
FIG. 6 is a cross-sectional view of a camera module (AF module) according to another embodiment of the present invention;
fig. 7 is a flowchart of an assembling method of a lens assembly according to an embodiment of the invention.
Detailed Description
The following description is provided to illustrate the technical solutions of the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The principles of the invention, as 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 invention. Also, it is noted that a feature, structure, or characteristic described herein in connection with one embodiment is not necessarily limited to the particular embodiment, nor is it intended to be mutually exclusive of other embodiments, as those skilled in the art will recognize various combinations of features of different embodiments as may be contemplated within the scope of the appended claims.
The terms first, second and the like in the description and in the claims, are used for distinguishing between different objects and not necessarily for describing a particular sequential order. Furthermore, the terms "comprising"/"including" and "having," and any variant thereof, are intended to cover non-exclusive inclusions. For example, a process, method, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. In the description of the present application, the terms "longitudinal", "lateral", "circumferential", "up", "down", "front", "back", "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 invention and for simplifying the description, and do not mean that the corresponding device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus the above terms should not be construed as limiting the present invention. In addition, the terms "a" and "an" should be interpreted as "at least one" or "one or more," i.e., the number of an element can be one in one embodiment and the number of the element can be plural in another embodiment, i.e., the terms "a" and "an" should not be interpreted 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 may be specifically interpreted based on their context within the context of the description of the relevant art.
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The invention relates to a camera module, in particular to a camera module for electronic equipment such as a mobile phone. The camera module mainly comprises a photosensitive component 2 and a light-transmitting component 1. The photosensitive assembly comprises a circuit board, a photosensitive chip and an electronic component; the photosensitive assembly may also include a molded body that encases an electronic component (MOB); the molding body covers a part of a photosensitive area (MOC) of the photosensitive chip. The light transmission component 1 comprises a filter component 12 and a lens component 11; the filter assembly 12 includes a filter (the filter is mounted on a lens holder, and the lens holder can be selectively mounted on any one of the circuit board, the molding body, and the non-photosensitive region of the photosensitive chip by glue); the lens assembly 11 includes a lens body 111 and a lens holder. The lens body is composed of a lens barrel 1111 and at least one optical lens 1112 arranged inside the lens barrel, and is mounted and fixed in the lens bearing seat through the lens barrel.
For a fixed focus camera module (FF module), the lens assembly 11 includes a lens body 111 and a lens carrier 112, which now constitutes the lens carrier.
For an autofocus camera module (AF module), the lens assembly 11 comprises a lens body 111 and a drive assembly, in particular having a motor and a motor carrier 112', which in this case constitutes the lens carrier. The motor can drive the lens to move or tilt, and the functions of automatic focusing, optical anti-shake and the like are realized; the motor can be selectively mounted on any one of the circuit board, the molded body and the lens holder by the motor adhesive.
Generally, the lens body 111 and the lens holder are assembled together by screwing. To this end, the barrel 1111 of the lens body 111 is provided with a first thread, and the lens holder (i.e., the lens carrier 112 or the motor carrier 112') is provided with a second thread.
Fig. 1 is a schematic cross-sectional view of a lens assembly assembled by screw-fitting and gluing in the prior art. As shown in the figure, according to the prior art, in order to better fix the lens assembly 11A, a gap between the lens body 111A and the end surface of the lens bearing block 112A is usually filled with glue, which is indicated by a glue application position P in the figure. However, after the glue is cured, the lens assembly may be inclined due to uneven shrinkage of the glue at different positions, and the misalignment and the partial non-engagement of the threads. Fig. 1A shows a defect of thread misalignment in a partially enlarged sectional view, and fig. 1B shows a defect of lens tilt in a partially unsnapped/excessively engaged thread in a partially enlarged sectional view, in which the lens body and the lens carrier are in an incorrect relative position.
Fig. 2 illustrates a cross-sectional schematic view of a lens assembly according to an embodiment of the invention. The lens assembly 11 includes: a lens body 111, which is composed of a lens barrel 1111 and at least one optical lens 1112 (shown in fig. 3) disposed inside the lens barrel; and the lens body is fixedly arranged in the lens bearing seat through the lens barrel. The invention proposes: at least a part of the matching part between the lens cone and the lens bearing seat is coated with an organic solvent, referring to an organic solvent applying position S marked in the figure, the organic solvent can contact with the material of the lens cone and/or the lens bearing seat to react, so that the lens cone and the lens bearing seat are stably positioned and jointed with each other.
Generally, the material of the lens barrel and the lens holder may be selected from one or more of PC, PP, and LCP (Liquid Crystal Polymer).
According to some embodiments of the invention, the organic solvent is a miscible solvent capable of swelling and dissolving the material of the lens barrel and/or lens holder. The organic solvent can swell (swelling is the phenomenon that the volume of the high polymer in the solvent expands) and dissolve the materials of the lens barrel and/or the lens bearing seat, the volume of the matching structure (such as the first thread) on the lens barrel and the matching structure (such as the second thread) on the lens bearing seat can expand, the matching gap after expansion is reduced, when the part coated by the organic solvent has no gap, the two are contacted with each other, the stability of the dissolved materials is reduced, the activity of the molecular chains is enhanced, the molecular chains of the two are rearranged and combined after the contact, and then the lens barrel and the lens bearing seat are combined into a whole at the contact part.
The mixed solvent may comprise DMF and THF components, or chloroform and THF components, or toluene and THF components. For example, depending on the material of the corresponding lens barrel and/or lens holder, the mixed solvent may be composed of DMF: THF 1:1 to 1:25, or chloroform: THF 3:5 to 3:10.6, or toluene: THF 2:3 to 2:20, in consideration of the reaction result or product required in the process, reaction sensitivity, reaction time, and the like.
According to some embodiments of the invention, the organic solvent is a corrosive solvent capable of corroding the material of the lens barrel and/or lens holder and producing a viscous metabolite. Here, the corrosion material may corrode the mating structure (e.g., the first thread) on the lens barrel and the mating structure (e.g., the second thread) on the lens holder at the same time, or corrode only one of them, which may dissolve or swell and generate a viscous metabolite, which may penetrate into the crevices of the mating structure (e.g., the threads) that are not corroded, and adhere the lens barrel and the lens holder together at the locations.
The corrosive solvent can be selected from one or more of acetone, aromatic hydrocarbon organic solvent and chlorinated hydrocarbon.
According to a preferred embodiment of the invention, the organic solvent is a liquid, and the amount applied is suitably from 0.5 to 10 microliters.
According to some embodiments of the present invention, the lens assembly is for a fixed focus camera module (FF module) and includes a lens carrier 112, which constitutes the lens carrier mount.
According to some embodiments of the invention, the lens arrangement is used for an autofocus camera module (AF module) and comprises a drive arrangement, in particular having a motor and a motor carrier 112', which in this case forms the lens carrier. Through the mode that sets up organic solvent between above-mentioned first screw thread and second screw thread, can avoid (or alleviate at least) the automatic module that zooms at the in-process that the motor drove carrier up-and-down motion, because the camera lens that the screw thread block on camera lens and the carrier was not tight and caused rocks, the camera lens rocks and can make the screw thread piece drop from the gap, arouses the problem of polluting the module of making a video recording. The motor carrier material can be LCP, PC, etc.
As shown in the figure, lens barrel 1111 of lens main body 111 is the cylinder form, and the lens bears the seat and has the shrinkage pool that is used for holding the lens barrel, the periphery wall of lens barrel is equipped with first screw thread, the internal perisporium of shrinkage pool is equipped with the second screw thread that corresponds with first screw thread, organic solvent at least local coating in first screw thread with the position of closure of second screw thread. Advantageously, the axial extension length of the first thread on the outer peripheral wall of the lens barrel covers only a part of the axial total length of the lens barrel, and the section provided with the first thread is located in the middle of the axial total length of the lens barrel, and the second thread is arranged at the corresponding section of the inner peripheral wall of the concave hole of the lens bearing seat with the axial extension length corresponding to the first thread, so that the lens barrel and the lens bearing seat are in a predetermined relative position after being screwed and installed through the first thread and the second thread.
Here, the above-mentioned way of setting the screw threads on the lens barrel and the lens holder is considered that: if the screw thread is arranged on the lower part of the lens main body (or the lens barrel thereof) close to the optical filter, the optical filter component is easy to impact or pollute; if the screw thread is disposed on the upper portion of the lens body (or the lens barrel thereof) away from the optical filter, the first screw thread on the lens barrel may not be screwed completely due to an error in the module assembly process, which may affect the appearance of the product.
Moreover, because the lens cone is long in screwing length when being set to be full thread, and more in turns, a large amount of scraps are easily produced in the screwing process to pollute the lens, so the thread on the lens component is not set to be full thread usually, and a gap is reserved between the lens main body and the end surface of the lens bearing seat.
Preferably, the section provided with the first thread occupies 1/4 to 2/3 of the total axial length of the lens barrel.
Fig. 3 is a cross-sectional view of a lens body of a lens assembly according to an embodiment of the invention, wherein h1 represents an axial extension length of a section of an outer circumferential surface of the lens body on which a first thread is provided, and h2 represents an axial extension length of a section of the first thread on which an organic solvent is provided.
As shown in fig. 4A, according to some embodiments, the organic solvent may be applied circumferentially around the first thread and/or the second thread.
In other embodiments, as shown in fig. 4B, the organic solvent may be applied to the first and/or second threads in a plurality of segments in a circumferential direction, the segments to which the organic solvent is applied being evenly spaced along the circumferential direction.
The first and second threads may be single triangular threads or circular arc threads. According to specific needs, the standard metric triangular thread is selected to be convenient to process and manufacture, and the circular arc thread is selected to achieve better thread connection strength and sealing performance.
The axial extension of the first and second threads is suitably from 0.20mm to 0.40mm, for example 0.25mm or 0.30 mm; and/or the total number of threads of the first and second threads may be 2-4, preferably 2.5, respectively. Preferably, the number of the screw threads which are reacted by contacting the first screw thread and the second screw thread with the organic solvent is 1.5 to 2.5.
Advantageously, the organic solvent is applied to the thread surface of the first thread and/or the second thread such that only the thread surface material reacts with the organic solvent. The organic solvent is coated on the thread surface layer, and the thread is not completely dissolved, the thread surface layer is swelled and dissolved by the organic solvent at the moment, or the thread surface layer is corroded to generate viscous metabolites at the moment, and the part which is not coated/contacted with the organic solvent can still be screwed in the thread, so that the alignment function is realized, and the lens barrel and the lens bearing seat can be positioned and jointed in a correct relative position.
According to the present invention, on one hand, the thread surface layer reacts with the organic solvent (i.e., the material of the lens barrel and/or the lens bearing seat is swelled and dissolved, or corroded and generates viscous metabolites), the lens barrel and the lens bearing seat are integrated after the material is dissolved and solidified, and the bonding force between the lens barrel and the lens bearing seat is increased, so that the lens barrel and the lens bearing seat have a strong enough bonding force to resist the shrinkage force of the glue, thereby solving the problem of lens inclination caused by the solidification shrinkage of the glue. On the other hand, the produced piece when the screw thread dislocation is rotatory can be dissolved by organic solvent, recombines or produces viscidity metabolite after dissolving, combines as an organic whole and glues lens cone and carrier mutually with the screw thread again, avoids the piece to drop and pollutes the module of making a video recording, and the piece can be recycled simultaneously, increases the adhesion.
Within the framework of the invention, organic solvents are used to react with the lens barrel and/or the carrier material and bond them. It should be noted that the connection fit between the lens body (or the lens barrel thereof) and the lens holder is not limited to a threaded structure, and for example, a shaft hole (non-threaded) fit is also conceivable, and it may be specified that: the lens barrel of the lens main body is in a cylindrical shape, the lens bearing seat is provided with a concave hole for accommodating the lens barrel, a shaft hole clearance fit is formed between the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole, and the organic solvent is at least partially coated on the clearance fit part of the shaft hole; preferably, the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole form the axial hole clearance fit only on a part of the axial total length of the lens barrel, and the section forming the axial hole clearance fit is positioned in the middle of the axial total length of the lens barrel; preferably, the section forming the shaft hole clearance fit accounts for 1/4-2/3 of the total axial length of the lens barrel. The cone end centering and positioning measures are additionally adopted, namely, in the front end area of the concave hole, the lens barrel is installed, a conical surface fit is formed between the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole, so that the lens barrel and the lens bearing seat can be automatically centered and axially positioned when being plugged into each other, and then the lens barrel and the lens bearing seat are in a preset relative position after being installed, wherein the axial extension length of the conical surface fit preferably accounts for 1/4-1/3 of the total axial length of the lens barrel, and the conicity of the conical surface formed on the outer peripheral wall of the lens barrel and the inner peripheral wall of the concave hole at the conical surface fit position can be 1: 1-1: 3. Also, it is possible that the organic solvent is circumferentially applied all around to the shaft-hole clearance fit portion on the outer circumferential wall of the lens barrel and/or the inner circumferential wall of the concave hole; or the organic solvent is coated on the shaft hole clearance fit part on the outer peripheral wall of the lens barrel and/or the inner peripheral wall of the concave hole in a plurality of sections in the circumferential direction, and the sections coated with the organic solvent are uniformly distributed at intervals along the circumferential direction.
Accordingly, the present invention provides a lens assembly assembling method, comprising the steps of:
-providing a lens body and a lens carrier;
-fitting the barrel of the lens body into the recess of the lens holder and locking the two in engagement with each other;
-at least partially coating an organic solvent at a mating portion between the lens barrel and the lens holder;
the material of the barrel and/or the lens holder reacts with the organic solvent to integrate the barrel and the lens holder.
Fig. 7 is a flowchart of an assembling method of a lens assembly according to an embodiment of the invention.
Particularly for the above-mentioned embodiment of adopting the threaded connection between the lens body (or the lens barrel thereof) and the lens bearing seat, the invention provides an assembling method of the lens assembly, comprising the following steps:
(A) providing a lens main body and a lens bearing seat;
(B) the front end of the lens cone is arranged in a concave hole of the lens bearing seat, and the first thread and the second thread are screwed and locked;
(C) at least partially coating an organic solvent on the screwing part of the first thread and the second thread;
(D) the first thread and/or the second thread surface layer material reacts with the organic solvent to combine the lens barrel and the lens bearing seat into a whole. Thereby the lens barrel and the lens bearing seat are firmly positioned and jointed with each other.
Since the organic solvent starts to react with the screw (swelling/dissolving or corrosion) when it comes into contact with the screw, if the organic solvent is applied to the surface of the screw and the screw is locked by the rear-turn lens, the screw is left on the surface and the screw is difficult to be locked, so that the method of first locking the screw and then applying the organic solvent is preferable.
According to some embodiments of the present invention, in the step (C), the coating amount of the organic solvent is at least 0.5 μ l, so that the organic solvent penetrates into the fitting gap between the lens barrel and the lens holder at the screw portion. Advantageously, the organic solvent enters the fitting gap between the lens barrel and the lens bearing seat at the screwing part by using gravity and the liquidity of the liquid and contacts with the first thread and the second thread surface layer.
According to some embodiments of the present invention, in the step (D), after the first thread and/or the second thread surface layer is swelled and dissolved by the organic solvent, the molecular chains are rearranged and combined, and the lens barrel and the lens holder are melt-bonded.
According to some embodiments of the present invention, in the step (D), the first thread and/or the second thread is/are corroded by the organic solvent to generate a viscous metabolite, so as to adhesively bond the lens barrel and the lens holder.
The invention also provides a camera module which comprises a photosensitive component and a light-transmitting component, wherein the light-transmitting component comprises the lens component. As mentioned above, the camera module can be implemented as a fixed focus camera module (FF module), see fig. 5, which includes a lens carrier 112, which constitutes the lens holder; it can also be implemented as an auto-focus camera module (AF module), see fig. 6, which includes a motor and a motor carrier 112', which constitutes the lens holder.
The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (25)
1. A lens assembly, comprising:
the lens body consists of a lens barrel and at least one optical lens arranged in the lens barrel; and
the lens body is fixedly arranged in the lens bearing seat through the lens barrel;
the lens barrel is characterized in that the matching part between the lens barrel and the lens bearing seat is at least partially coated with an organic solvent, and the organic solvent can contact with the material of the lens barrel and/or the lens bearing seat to react, so that the lens barrel and the lens bearing seat are stably positioned and combined with each other.
2. The lens assembly of claim 1, wherein the lens barrel and the lens carrier are made of a material selected from one or more of PC, PP, LCP.
3. The lens assembly of claim 1 or 2, wherein the organic solvent is a miscible solvent that is capable of swelling and dissolving the material of the lens barrel and/or lens carrier.
4. The lens assembly of claim 3, wherein the mixed solvent comprises DMF and THF components, or chloroform and THF components, or toluene and THF components.
5. The lens assembly of claim 1 or 2, wherein the organic solvent is a corrosive solvent capable of corroding materials of the lens barrel and/or lens carrier and producing a viscous metabolite.
6. The lens assembly of claim 5, wherein the corrosive solvent is selected from one or more of acetone, aromatic hydrocarbon organic solvents, chlorinated hydrocarbons.
7. The lens assembly as claimed in any one of claims 1 to 6, wherein the organic solvent is a liquid and is applied in an amount of 0.5 to 10 μ l.
8. The lens assembly of any one of claims 1 to 7, wherein the lens assembly is for a fixed focus camera module and comprises a lens carrier constituting the lens carrier mount.
9. The lens assembly of any one of claims 1 to 7, wherein the lens assembly is for an auto-focus camera module and comprises a motor and a motor carrier, the motor carrier constituting the lens carrier.
10. The lens assembly of any one of claims 1 to 9, wherein the lens barrel of the lens body is cylindrical, the lens holder has a recess for receiving the lens barrel, the outer peripheral wall of the lens barrel is provided with a first thread, the inner peripheral wall of the recess is provided with a second thread corresponding to the first thread, and the organic solvent is at least partially applied to a portion where the first thread and the second thread are engaged.
11. The lens assembly of claim 10, wherein the first thread extends axially along an outer peripheral wall of the barrel over only a portion of an axial overall length of the barrel, and the section provided with the first thread is located at a middle portion of the axial overall length of the barrel, and the second thread is provided at a corresponding section of an inner peripheral wall of the recess hole of the lens holder, with an axial extension corresponding to the first thread, such that the barrel and the lens holder are in a predetermined relative position after being threadedly mounted by the first thread and the second thread.
12. The lens assembly of claim 11, wherein the section provided with the first thread occupies 1/4 to 2/3 of the total axial length of the barrel.
13. The lens assembly of any of claims 10-12, wherein the organic solvent is circumferentially applied around the first threads and/or the second threads.
14. The lens assembly of any one of claims 10 to 12, wherein the organic solvent is applied to the first threads and/or the second threads in a plurality of sections in a circumferential direction, the sections to which the organic solvent is applied being evenly spaced along the circumferential direction.
15. The lens assembly of any one of claims 10 to 14, wherein the first threads and the second threads are single triangular threads or circular arc threads.
16. The lens assembly of any one of claims 10 to 15, wherein the first thread and the second thread have an axial extension of 0.20mm to 0.40 mm.
17. The lens assembly of any one of claims 10 to 16, wherein the first and second threads each have a total number of threads of 2-4.
18. The lens assembly of any one of claims 10 to 17, wherein the first thread and the second thread react upon contact with the organic solvent for a number of turns of 1.5-2.5.
19. The lens assembly of any one of claims 10-18, wherein the organic solvent is applied to a thread skin of the first threads and/or the second threads such that only a thread skin material reacts with the organic solvent.
20. A method of assembling the lens assembly of any one of claims 10 to 19, comprising the steps of:
(A) providing a lens main body and a lens bearing seat;
(B) the front end of the lens cone is arranged in a concave hole of the lens bearing seat, and the first thread and the second thread are screwed and locked;
(C) at least partially coating an organic solvent on the screwing part of the first thread and the second thread;
(D) the first thread and/or the second thread surface layer material reacts with the organic solvent to combine the lens barrel and the lens bearing seat into a whole.
21. The assembling method according to claim 20, wherein in the step (C), the coating amount of the organic solvent is at least 0.5 μ l so that the organic solvent penetrates into the fitting gap between the lens barrel and the lens holder at the screw portion.
22. The method according to claim 21, wherein the organic solvent enters the fitting gap between the lens barrel and the lens holder at the screw-in position and contacts the first thread and the second thread surface layer by gravity and fluidity of the liquid.
23. The assembling method according to any one of claims 20 to 22, wherein in the step (D), after the first thread and/or the second thread surface layer is swollen and dissolved by the organic solvent, the molecular chains are rearranged and combined, and the lens barrel and the lens holder are bonded by fusion bonding.
24. The assembly method according to any one of claims 20 to 22, wherein in the step (D), the first thread and/or the second thread is/are corroded by the organic solvent to generate a viscous metabolite, so as to adhesively bond the lens barrel and the lens holder.
25. A camera module, comprising:
a photosensitive assembly; and
a light transmissive component;
a light-transmissive component comprising the lens component of any one of claims 1 to 19.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010689733.6A CN113946026A (en) | 2020-07-17 | 2020-07-17 | Lens assembly, assembling method thereof and camera module comprising lens assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010689733.6A CN113946026A (en) | 2020-07-17 | 2020-07-17 | Lens assembly, assembling method thereof and camera module comprising lens assembly |
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| CN110054795A (en) * | 2018-01-19 | 2019-07-26 | 清华大学 | Thermoset macromolecule material processing, healing and welding method |
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| GB726690A (en) * | 1952-04-16 | 1955-03-23 | Lonza Ag | Method of bonding plastic parts together |
| KR810001445B1 (en) * | 1977-12-10 | 1981-10-22 | 조셉니그로 | Solvent bonded joint and method of making the same |
| CN201765370U (en) * | 2010-08-31 | 2011-03-16 | 宁波舜宇光电信息有限公司 | Image pickup module of mobile phone |
| KR20120076124A (en) * | 2010-12-29 | 2012-07-09 | 주식회사 코렌 | Assembling method of lens assembly and apparatus adopting the same |
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