CN110542969B - Optical lens, camera module and assembling method thereof - Google Patents
Optical lens, camera module and assembling method thereof Download PDFInfo
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- CN110542969B CN110542969B CN201810532712.6A CN201810532712A CN110542969B CN 110542969 B CN110542969 B CN 110542969B CN 201810532712 A CN201810532712 A CN 201810532712A CN 110542969 B CN110542969 B CN 110542969B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 140
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000001070 adhesive effect Effects 0.000 claims abstract description 83
- 239000000853 adhesive Substances 0.000 claims abstract description 82
- 238000003384 imaging method Methods 0.000 claims abstract description 33
- 239000003292 glue Substances 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 43
- 229920001187 thermosetting polymer Polymers 0.000 claims description 9
- 238000012634 optical imaging Methods 0.000 claims description 7
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 238000001723 curing Methods 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 14
- 238000013461 design Methods 0.000 description 11
- 230000015556 catabolic process Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000004304 visual acuity Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000014509 gene expression Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000011499 joint compound Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
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- 238000009776 industrial production Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
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Classifications
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- 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- 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
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
The present invention provides an optical lens comprising: a first lens part including a first barrel and at least one first lens including a first optical zone and a first structural zone, the first lens being a bottom first lens located at the lowermost part; a second lens component including a second barrel and at least one second lens, the at least one first lens and the at least one second lens together constituting an imageable optical system, and a bottom surface of a first structural region of the bottom first lens being lower than a top surface of the second barrel; and the connecting adhesive is positioned between the first lens component and the second lens component and is suitable for supporting the first lens component and the second lens component and fixing the relative position between the first lens component and the second lens component. The invention also provides a corresponding camera module and an assembly method. The invention can reduce the optical total length of the camera module, thereby reducing the height of the camera module; the imaging quality can be improved.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens, an imaging module and an assembling method thereof.
Background
With the popularity of mobile electronic devices, related technologies of camera modules for helping users acquire images (e.g., video or images) applied to mobile electronic devices have been rapidly developed and advanced, and in recent years, camera modules have been widely used in various fields such as medical treatment, security, industrial production, etc.
In order to meet the increasingly wide market demands, high-pixel, small-size and large-aperture imaging modules are irreversible development trends. However, the need to achieve three aspects of high pixels, small size, large aperture in the same camera molding is very difficult. For example, the compact development of mobile phones and the increase of the screen ratio of mobile phones make the space inside the mobile phones capable of being used for the front camera module smaller and smaller, and the market has put forward higher and higher demands on the imaging quality of the camera module.
In the field of compact camera modules (e.g., camera modules for cell phones), it is often necessary to take into account the quality of the optical imaging lens and manufacturing errors during the packaging of the module. Specifically, in the manufacturing process of the optical imaging lens, factors affecting the resolution of the lens come from errors in the assembly of the elements, errors in the thickness of the lens spacing elements, errors in the assembly fit of the lenses, variations in the refractive index of the lens material, and the like. The errors of the components and the assembly thereof comprise errors such as the thickness of the optical surface of each lens unit, the sagittal height of the optical surface of the lens, the surface of the optical surface, the radius of curvature, the single surface and the decentration between the surfaces of the lens, the inclination of the optical surface of the lens and the like, and the sizes of the errors depend on the control capability of the mold precision and the molding precision. The error in the thickness of the lens spacing element depends on the accuracy of the machining of the element. The error in fitting of the lenses depends on the dimensional tolerance of the elements to be fitted and the fitting accuracy of the lens. The errors introduced by the variation in refractive index of the lens material depend on the stability of the material and the batch consistency. The error of each element affecting the resolution is accumulated and deteriorated, and the accumulated error is increased with the increase of the number of lenses. The existing solution is to control tolerance for the size of each element with high relative sensitivity and compensate for lens rotation to improve the solution, but because the lens with high pixel and large aperture is sensitive, the tolerance is strict, such as: partial sensitive lens 1um lens eccentricity can bring 9' image surface inclination, leads to lens processing and equipment degree of difficulty to be greater and greater, simultaneously because feedback period is long in the assembly process, causes the process ability index (CPK) of lens equipment low, undulant big, leads to the defective rate high. And as described above, because there are many factors affecting the resolution of the lens, there are limits on the manufacturing accuracy for each factor, if only the accuracy of each element is simply improved, the improvement ability is limited, the improvement cost is high, and the imaging quality requirements of the market increasing are not satisfied.
The applicant provides an assembly method for adjusting and determining the relative positions of an upper sub-lens and a lower sub-lens based on an active calibration process, and then bonding the upper sub-lens and the lower sub-lens together according to the determined relative positions, so as to manufacture a complete optical lens or an image pickup module. The solution can improve the process capability index (CPK) of mass-produced optical lenses or camera modules; the requirements on the precision of each element of materials (such as a sub-lens or a photosensitive assembly for assembling an optical lens or a camera module) and the assembly precision thereof can be widened and loosened, so that the overall cost of the optical imaging lens and the camera module is reduced; various aberrations of the camera module can be adjusted in real time in the assembly process, the reject ratio is reduced, the production cost is reduced, and the imaging quality is improved.
However, in order to leave a space for active calibration, a certain gap is often required to be left in design between the bottom surface of the upper sub-lens and the top surface of the lower sub-lens, and this gap causes that the height (referring to the dimension in the direction of the optical axis) of the lens based on the active calibration process is often larger than that of the single lens (referring to the lens with only a single barrel). The excessive height of the lens or camera module is often one of the important factors that limit the size reduction of the terminal device (e.g., mobile phone) (e.g., reduce the thickness of the mobile phone).
On the other hand, active calibration of the optical system of the lens is a new production process, and the actual mass production needs to consider many factors such as reliability, anti-falling property, weather resistance, manufacturing cost and the like of the optical lens and the camera module, and sometimes needs to face the decline of yield caused by various undetectable factors. For example, in one process scenario, a glue material is filled between the first lens component and the second lens component to maintain the first lens component and the second lens component in a relative position determined by active calibration. However, actual trial production shows that the imaging quality of the optical lens and the camera module often deteriorates compared with the imaging quality obtained in the active calibration stage, and the deterioration sometimes exceeds the tolerance range, resulting in poor products. The applicant has found that, after the active calibration process is introduced in the assembly of the optical lens or the camera module, variations in the glue, barrel or lens and other unknown factors may be the cause of the above problems. There is an urgent need for a solution that overcomes the above problems in order to improve the product yield.
Disclosure of Invention
The present invention aims to provide a solution that overcomes at least one of the drawbacks of the prior art.
According to an aspect of the present invention, there is provided an optical lens comprising: a first lens part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and having one bottom first lens located at the lowermost position among the at least one first lens;
a second lens part including a second barrel and at least one second lens mounted to the second barrel, the at least one first lens and the at least one second lens together constituting an imageable optical system, and a bottom surface of a first structural region of the bottom first lens being lower than a top surface of the second barrel; and the connecting adhesive is positioned between the first lens component and the second lens component and is suitable for supporting the first lens component and the second lens component and fixing the relative position between the first lens component and the second lens component.
In one embodiment, the connecting glue is adapted to support and fix the first lens component and the second lens component so that the first lens component and the second lens component are kept at relative positions determined by active calibration, and an included angle which is different from zero is formed between the axis of the first lens component and the axis of the second lens component, wherein the active calibration is a relative position adjustment of the first lens component and the second lens component according to an actual imaging result of the optical system.
In one embodiment, the connecting glue material comprises a first glue material located between the bottom surface of the first lens barrel and the top surface of the second lens barrel.
In one embodiment, the second lens includes a second optical zone for imaging and a second structural zone outside the second optical zone, the at least one second lens having a top second lens located uppermost therein; the connecting adhesive material further comprises a second adhesive material which is positioned between a first bottom surface and a second top surface, wherein the first bottom surface is the bottom surface of the first structural area of the bottom first lens, and the second top surface is the top surface of the second structural area of the top second lens.
In one embodiment, the first glue material is adapted to temporarily support and fix the relative position of the first lens part and the second lens part after pre-curing, and the second glue material is adapted to permanently support and fix the relative position of the first lens part and the second lens part after curing.
In one embodiment, the first adhesive is a photo-setting adhesive and the second adhesive is a thermosetting adhesive.
In one embodiment, the first and second glue materials are both UV thermosetting glue.
In one embodiment, the first bottom surface and the second top surface are both planar surfaces.
In one embodiment, the inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.
In one embodiment, the second glue contacts the second barrel.
In one embodiment, the at least one second lens has a top second lens located at the uppermost position, wherein at least one of the light exit surface of the bottom first lens and the light entrance surface of the top second lens is not convex.
In one embodiment, the second adhesive does not contact the second barrel.
In one embodiment, the second structural region of the top second lens comprises a bearing region and a bonding region, wherein the side and top surfaces of the bearing region bear against the stepped bearing surface, and the bonding region disposes the second adhesive.
In one embodiment, the second top surface has a glue overflow groove, the glue overflow groove is located at one end of the second top surface near the second optical area, and the second glue material is black.
In one embodiment, the first lens component is located at the front end of the optical lens and the second lens component is located at the rear end of the optical lens.
According to another aspect of the present invention, there is also provided an image capturing module including any one of the above optical lenses.
According to another aspect of the present invention, there is also provided an optical lens assembly method including: preparing a first lens part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and the at least one first lens having one bottom first lens located at the lowermost position, and a second lens part including a second barrel and at least one second lens mounted to the second barrel; pre-positioning the first lens part and the second lens part so that the at least one first lens and the at least one second lens together form an imageable optical system, and so that the bottom surface of the first structural region of the bottom first lens is lower than the top surface of the second lens barrel; actively calibrating the relative positions of the first lens component and the second lens component based on the actually measured imaging result of the optical system; and bonding the first lens part and the second lens part by using a connecting adhesive so as to keep the first lens part and the second lens part at the relative positions determined by active calibration.
In one embodiment, the step of bonding with the joint compound comprises: arranging the connecting adhesive on the top surface of the second lens component; moving the first lens component and the second lens component to the relative position determined by active calibration; and curing the connecting adhesive material.
In one embodiment, the step of actively calibrating is performed first, and then the step of disposing the connection glue is performed.
In one embodiment, the step of disposing the connection glue is performed first, and then the step of actively calibrating is performed.
In one embodiment, in the step of bonding with a connection adhesive, the connection adhesive includes a first adhesive and a second adhesive, and the step of disposing the connection adhesive includes: the first adhesive material is arranged on the top surface of the second lens barrel, and the second adhesive material is arranged on the second top surface, wherein the second top surface is the top surface of a second structural area of a top second lens, the top second lens is the uppermost second lens in the at least one second lens, and the second structural area is an area of the second lens except for an optical area for optical imaging.
In one embodiment, in the step of bonding with a connecting adhesive, the first adhesive is located between a bottom surface of the first barrel and a top surface of the second barrel, and the second adhesive is located between the second top surface and the first bottom surface, wherein the first bottom surface is a bottom surface of a first structural region of the bottom first lens.
In one embodiment, the step of curing the joint compound includes: pre-curing the first adhesive to temporarily support and fix the relative positions of the first lens component and the second lens component; and permanently curing the second adhesive to permanently support and fix the relative positions of the first lens component and the second lens component.
In one embodiment, the pre-curing includes exposing the first glue material to light.
In one embodiment, the permanent curing includes a bake treatment of the first lens component and the second lens component after the pre-curing.
In one embodiment, in the preparing step, an inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.
In one embodiment, the step of actively calibrating comprises: and enabling the interval between the first bottom surface and the second top surface along the optical axis direction to be in the range of less than 80um for active calibration.
Compared with the prior art, the invention has at least one of the following technical effects:
1. the invention can reduce the total optical length (TTL) of the camera module, thereby reducing the height of the camera module.
2. The split type assembled optical lens based on active calibration can improve the imaging quality of the optical lens and the camera module, and is particularly suitable for compact camera modules (such as mobile phone camera modules).
3. In some embodiments of the present invention, the difficulty of the process for forming the first lens and the second lens is low, which is helpful to save cost and improve production efficiency.
4. In some embodiments of the present invention, the manufacturing process of the second lens component is mature, so that the assembly tolerance of the second lens barrel and the second lens can be reduced, and further the imaging quality and the yield are improved.
5. Some embodiments of the present invention can suppress degradation of imaging quality caused by secondary variation of a split-type assembled optical lens based on active calibration.
6. Some embodiments of the present invention may inhibit or prevent glue overflow from contaminating the optical system, thereby improving product yield.
Drawings
Exemplary embodiments are illustrated in referenced figures. The embodiments and figures disclosed herein are to be regarded as illustrative rather than restrictive.
Fig. 1 shows a schematic longitudinal section of an optical lens 1000 in a comparative example;
FIG. 2 is a schematic view showing a longitudinal section of an optical lens according to an embodiment of the present invention;
FIG. 3A shows a schematic longitudinal cross-section of another embodiment of the invention;
FIG. 3B illustrates a top second lens 201 in the embodiment illustrated in FIG. 3A;
FIG. 4A is a schematic view showing a longitudinal section of an optical lens according to still another embodiment of the present invention;
FIG. 4B illustrates the top first lens 101 in the embodiment of FIG. 4A;
FIG. 5A is a schematic view showing a longitudinal section of an optical lens according to still another embodiment of the present invention;
FIG. 5B illustrates the top first lens 101 in the embodiment of FIG. 5A;
FIGS. 6A-D illustrate an optical lens assembly process according to one embodiment of the invention;
FIG. 7A illustrates relative position adjustment in active calibration in one embodiment of the invention;
FIG. 7B illustrates rotational adjustment in active calibration in accordance with another embodiment of the present invention;
FIG. 7C illustrates a relative position adjustment with increased v, w direction adjustment in active calibration in accordance with yet another embodiment of the present invention;
FIG. 8 illustrates an auto-focus module in one embodiment of the invention;
fig. 9 shows an optical lens in an embodiment of the invention.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.
In the drawings, the thickness, size and shape of the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
As used herein, the terms "substantially," "about," and the like are used as terms of a table approximation, not as terms of a table level, and are intended to illustrate inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
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 to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 2 shows a schematic longitudinal section of an optical lens according to an embodiment of the present invention. The longitudinal section herein refers to a section passing through the optical axis, and will not be described in detail. Referring to fig. 2, the optical lens of the present embodiment includes: the lens comprises a first lens component 100, a second lens component 200 and a connecting adhesive material. Wherein the first lens part 100 includes a first lens barrel 102 and one first lens 101 mounted to the first lens barrel 102, the first lens 101 including a first optical zone 1011 for imaging and a first structural zone 1012 outside the first optical zone 1011. The second lens part 200 includes a second lens barrel 202 and four second lenses 201 mounted to the second lens barrel 202, the first lens 101 and the four second lenses 201 together constitute an imageable optical system, and a bottom surface of a first structural area 1012 of the first lens 101 is lower than a top surface of the second lens barrel 202. For example, the height (refer to the dimension in the optical axis direction) of the inner side surface of the first lens barrel 102 may be designed to be smaller than the thickness (refer to the dimension in the optical axis direction) of the first structural region, so that after the first lens is embedded in the first lens barrel, a part of the outer side surface of the first lens 101 is exposed outside the inner side surface of the first lens barrel 102, and the exposed part is sunk into the light-transmitting hole of the second lens barrel 202, thereby realizing that the bottom surface of the first structural region 1012 of the first lens 101 is lower than the top surface of the second lens barrel 202. Further, a connecting adhesive is located between the first lens part 100 and the second lens part 200, and is adapted to support the first lens part 100 and the second lens part 200 and fix the relative positions therebetween. In this embodiment, the connecting adhesive is adapted to support and fix the first lens component 100 and the second lens component 200, so that the two components are kept at the relative positions determined by active calibration, and an included angle between the axis of the first lens component 100 and the axis of the second lens component 200 may be different from zero, where the active calibration is the adjustment of the relative positions of the first lens component 100 and the second lens component 200 according to the actual imaging result of the optical system. Active calibration is further described below in connection with embodiments. In this embodiment, the connecting adhesive material includes a first adhesive material 301, which is located between the bottom surface of the first lens barrel 102 and the top surface of the second lens barrel 202.
It should be noted that in another embodiment, the number of the first lenses 101 may be plural. At this time, one bottom first lens 101 located at the lowermost position is included in the plurality of first lenses 101. And the bottom surface of the first structural area 1012 of the bottom first lens 101 is lower than the top surface of the second barrel 202. In addition, it is readily understood that when there is only one first lens 101 (e.g., as shown in FIG. 2), then that first lens 101 can be considered the bottom first lens 101.
In the above embodiment, the bottom surface of the first structural area 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202, so that the position of the first lens 101 of the lens (may be referred to as an AOA lens) based on the active calibration technology is sunk, the total optical length (TTL) of the image capturing module is reduced, and the height of the image capturing module is further reduced.
In order to make the above technical effects easier to understand, the following description is made in connection with the comparative example of fig. 1. Fig. 1 shows a schematic longitudinal section of an optical lens 1000 in one comparative example. The optical lens 1000 includes a first lens component 100, a second lens component 200, and a connecting adhesive. The first lens part 100 includes a first lens 101 and a first barrel 102, and the second lens part 200 includes a second barrel 202 and a plurality of second lenses 201. The inner side of the second lens barrel 202 is provided with a multi-stage step-shaped bearing surface 2022, and the plurality of second lenses 201 are sequentially embedded into the multi-stage step-shaped bearing surface 2022 from small to large. The design size of the topmost second lens 201 is usually smaller, the top region 2021 of the second barrel is often between the first lens 101 and the second lens 201, and a gap required for active calibration needs to be reserved, so the distance D between the bottom surface of the structural region of the first lens 101 and the top surface of the structural region of the second lens 201 is determined by the reserved gap required for active calibration and the thickness of the top region 2021 of the second barrel 202 between the first lens 101 and the second lens 201. In the optical design stage, the surface shape of each lens must take into account the distance D, so that the active calibration has the required active space. In the present invention, the bottom surface of the first structural area 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202, so that the thickness of the top area 2021 of the second lens barrel 202 is not required to be considered in the optical design stage, and the first lens 101 of the AOA lens can be sunk in the surface design, thereby reducing the total optical length (TTL) of the image capturing module and further reducing the height of the image capturing module.
Further, fig. 3A shows a schematic longitudinal section of another embodiment of the present invention. Fig. 3B illustrates the top first lens 101 in the embodiment illustrated in fig. 3A. Referring to fig. 3A and 3B, in the present embodiment, the second lens 201 includes a second optical area 2011 for imaging and a second structural area other than the second optical area 2011, and the plurality of second lenses 201 includes a top second lens 201 located at the uppermost position. The connecting glue material comprises a first glue material 301 and a second glue material 302. The first adhesive 301 is located between the bottom surface of the first barrel 102 and the top surface of the second barrel 202. The second adhesive 302 is located between a first bottom surface 1013 and a second top surface 2013, wherein the first bottom surface 1013 is a bottom surface of the first structural region 1012 of the bottom first lens 101 and the second top surface 2013 is a top surface of the second structural region 2012 of the top second lens 201. The first adhesive 301 is adapted to temporarily support and fix the relative positions of the first lens component 100 and the second lens component 200 after pre-curing. The second glue 302 is adapted to permanently support and fix the relative position of the first lens part 100 and the second lens part 200 after curing. In this embodiment, the first adhesive 301 may be a photo-curing adhesive, and the second adhesive 302 may be a thermosetting adhesive. In another embodiment, the first adhesive 301 and the second adhesive 302 may be UV thermosetting adhesives. In this embodiment, the second adhesive 302 is located between the first lens 101 and the second lens 201 to fix and support the first lens component 100 and the second lens component 200 at the relative position determined by the active calibration, so as to inhibit the degradation of the imaging quality caused by the secondary variation (for example, the secondary variation caused by the unstable combination of the first lens barrel 102 and the first lens 101). In this embodiment, the surfaces of the structural areas of the first lens 101 and the second lens 201 are flat surfaces. The difficulty in the process of forming the first lens 101 and the second lens 201 is low, which is helpful to save cost and improve production efficiency.
Further, in one embodiment, the first bottom surface 1013 and the second top surface 2013 are both planar surfaces. The inner side of the second barrel 202 has a stepped bearing surface 2022, and at least a portion of the second top surface 2013 bears against the stepped bearing surface 2022. In the embodiment, the manufacturing process of the second lens component 200 is mature, so that the assembly tolerance of the second lens barrel 202 and the second lens 201 can be reduced, and the imaging quality and the yield can be improved.
In one embodiment, the second glue 302 contacts the second barrel 202. The second glue 302 may be black. The black second glue 302 helps to block stray light from entering the optical system from the second structural region 2012.
In another embodiment, the second adhesive 302 does not contact the second barrel 202. In this embodiment, the first lens 101 and the second lens 201 are directly fixed and supported by the second adhesive 302, so as to inhibit degradation of imaging quality caused by secondary variation. For example, it is possible to suppress secondary variation due to unstable bonding of the first lens barrel 102 to the first lens 101, and it is also possible to prevent variation in the position or surface shape of the first lens 101 due to variation in the lens barrel (for example, variation in the first and second lens barrels after being heated or wetted).
Fig. 4A shows a schematic longitudinal section of an optical lens according to still another embodiment of the present invention. Fig. 4B illustrates the top first lens 101 in the embodiment illustrated in fig. 4A. Referring to fig. 4A and 4B, in the present embodiment, the second structural region 2012 of the top second lens 201 includes a bearing region 2014 and a bonding region 2015, wherein the side surfaces and the top surface of the bearing region bear against the step-shaped bearing surface 2022, and the bonding region is disposed on the second adhesive 302.
Further, fig. 5A shows a schematic longitudinal section of an optical lens according to still another embodiment of the present invention. Fig. 5B illustrates the top first lens 101 in the embodiment illustrated in fig. 5A. Referring to fig. 5A and 5B, in this embodiment, the second top surface 2013 may have a glue overflow groove 2019, the glue overflow groove 2019 is located at an end of the second top surface 2013 near the second optical area 2011, and the second glue 302 may be black. The embodiment can prevent the second adhesive 302 from polluting the optical area, and avoid the defects caused by the stain of the shot image, thereby improving the yield of the optical lens or the manufacture of the camera module.
Further, in one embodiment, the first lens component 100 is located at the front end of the optical lens and the second lens component 200 is located at the rear end of the optical lens.
Further, in one embodiment, the first lens has a bottom first lens at a lowermost end and the second lens has a top second lens at an uppermost end. At least one of the light emergent surface of the bottom first lens and the light incident surface of the top second lens is not convex. Namely, when the light emergent surface of the bottom first lens is a convex surface, the light emergent surface of the top second lens is a concave surface or a plane; when the light incident surface of the top second lens is convex, the light emergent surface of the bottom first lens is concave or plane. The above design is to avoid that the light exit surface of the bottom first lens and the light entrance surface of the top second lens are convex at the same time, so that the first bottom surface 1013 is difficult to sink into the light passing hole of the second lens barrel. It should be noted that the light exit surface of the bottom first lens and the light entrance surface of the top second lens may be concave, or both may be plane, or one may be plane, and the two may be concave, which may be convenient for the first bottom surface 1013 to sink into the light passing hole of the second lens barrel. Fig. 9 shows an optical lens in an embodiment of the invention. As shown in fig. 9, the light exit surface of the bottom first lens is concave, and the light entrance surface of the top second lens is convex. In addition, an adhesive 1019 that adheres the first lens to the first barrel is shown in this figure.
In addition, it should be noted that the first bottom surface (the bottom surface of the first structural region of the bottom first lens) being lower than the top surface of the second barrel means that the first bottom surface is entirely lower than the top surface of the second barrel.
Further, in some embodiments of the present invention, an image capturing module is provided. The camera module may include the optical lens in any of the foregoing embodiments. The camera module may include an optical lens and a photosensitive assembly. The optical lens is mounted and fixed on the photosensitive assembly. Wherein, the photosensitive assembly is provided with a photosensitive chip. The camera module can be a fixed focus module, or can be an automatic focusing module or other types of modules. Fig. 8 illustrates an autofocus module in an embodiment of the invention in which the second lens element further includes a motor 209 (or other optical actuator). The second lens barrel 202 is mounted inside the motor carrier, and the base of the motor is mounted on the top surface of the lens holder 409 of the photosensitive assembly.
Further, according to an embodiment of the present invention, there is also provided an optical lens assembly method including steps S10 to S40.
In step S10, a first lens component 100 and a second lens component 200 are prepared, wherein the first lens component 100 includes a first barrel 102 and at least one first lens 101 mounted to the first barrel 102, the first lens 101 includes a first optical zone 1011 for imaging and a first structural zone 1012 outside the first optical zone 1011, and the at least one first lens 101 has one bottom first lens 101 located at the lowermost position, and the second lens component 200 includes a second barrel 202 and at least one second lens 201 mounted to the second barrel 202. The inner side of the second barrel 202 may have a stepped bearing surface 2022, and at least a portion of the second top surface 2013 bears against the stepped bearing surface 2022.
In step S20, the first lens component 100 and the second lens component 200 are pre-positioned such that the at least one first lens 101 and the at least one second lens 201 together form an imageable optical system, and such that the bottom surface of the first structural area 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202.
Step S30, actively calibrating the relative positions of the first lens component 100 and the second lens component 200 based on the actually measured imaging result of the optical system.
Step S40, adhering the first lens component 100 and the second lens component 200 with a connecting adhesive material, so as to keep the first lens component 100 and the second lens component 200 at the relative positions determined by active calibration.
Further, in one embodiment, step S40 includes: disposing the connection glue material on the top surface of the second lens component 200; moving the first lens part 100 and the second lens part 200 to the relative position determined by active calibration; and curing the connecting adhesive material. The step of actively calibrating may be performed first, followed by the step of arranging the connection glue. The step of disposing the connection glue may be performed first, and then the step of actively calibrating may be performed.
Further, in one embodiment, in step S40, the step of curing the connection glue material includes: pre-curing the first adhesive 301 to temporarily support and fix the relative positions of the first lens component 100 and the second lens component 200; and permanently curing the second adhesive to permanently support and fix the relative positions of the first lens component 100 and the second lens component 200. Wherein the pre-curing may include exposing the first adhesive 301. The permanent curing may include a baking process of the first lens member 100 and the second lens member 200 after the pre-curing.
Fig. 6A to D illustrate an optical lens assembly process according to an embodiment of the present invention. Fig. 6A shows a schematic diagram of the painting according to an embodiment of the present invention. Referring to fig. 6A, first lens part 100 and second lens part 200 are fabricated, respectively, and then a glue is drawn on the top surface of second lens part 200. In this embodiment, the connecting adhesive material includes a first adhesive material 301 and a second adhesive material 305, the first adhesive material 301 is located between the bottom surface of the first lens barrel 102 and the top surface of the second lens barrel 202, and the second adhesive material 301 is located between the second top surface 2013 and the first bottom surface 1013, wherein the first bottom surface 1013 is the bottom surface of the first structural area 1012 of the bottom first lens 101. In step S40, the step of disposing the connection adhesive includes: the first glue 301 is arranged on the top surface of the second barrel 202, and the second glue 302 is arranged on the second top surface 2013, wherein the second top surface 2013 is the top surface of the second structural area 2012 of the top second lens 201, the top second lens 201 is the uppermost one of the at least one second lens 201, and the second structural area 2012 is an area of the second lens 201 other than the optical area for optical imaging. Fig. 6B shows a schematic diagram of the arrangement of the first lens component 100 and the second lens component 200 to the relative positions determined by active calibration in one embodiment of the invention. The active calibration may be performed before the drawing of the glue, and the corresponding coordinates may be recorded, and the first lens component 100 and the second lens component 200 may be arranged according to the recorded coordinates after the drawing of the glue so that the two recover the relative positions determined by the active calibration. The active calibration may also be performed after the glue is drawn, specifically, the pre-positioning (step S20) and the active calibration (step S30) may be performed after the glue is drawn, and the relative positions of the first lens component 100 and the second lens component 200 that the imaging quality meets the standard are determined according to the measured resolution. FIG. 6C shows a schematic representation of pre-curing in one embodiment of the invention. In this embodiment, the pre-curing is done by an exposure process, wherein the arrows schematically indicate the direction of illumination. Note that during pre-cure, the first lens component 100 and the second lens component 200 are maintained in the relative position determined by active calibration by an external uptake mechanism (e.g., a clamping mechanism). After the pre-curing is completed, the relative position determined by the active calibration can be maintained by the fixing and supporting of the first glue material 301 after the pre-curing. FIG. 6D illustrates a schematic of permanent cure in one embodiment of the invention. In this embodiment, the curing of the second adhesive 302 may be achieved by integrally baking the pre-cured semi-finished product. The second glue 302 may be a thermosetting glue or a UV thermosetting glue. Since thermosetting may have a stronger adhesive effect, permanent curing, i.e., permanent bonding of the first lens member 100 and the second lens member 200, may be achieved. And the combination has the advantages of high reliability, good weather resistance and the like.
Further, in one embodiment, in step S30, the step of actively calibrating includes: the active alignment is performed such that the distance between the first bottom surface 1013 and the second top surface 2013 along the optical axis direction is in a range of less than 80 um. Because the first lens adopts a sunk design, the design gap between the bottom first lens and the top second lens (the design gap between the structural area of the bottom first lens and the structural area of the top second lens) can be reduced in the optical design stage.
Further, according to an embodiment of the present invention, there is also provided a method for manufacturing an image capturing module, including: manufacturing an optical lens by using the optical lens manufacturing method in the embodiment; and installing the optical lens on the photosensitive assembly to obtain the image pickup module. Note that in this embodiment, the optical lens may be manufactured first and then mounted on the photosensitive assembly; the assembly of the optical lens (for example, the adhesion of the first lens component and the second lens component) and the assembly of the optical lens and the photosensitive assembly (for example, the adhesion of the second lens component and the photosensitive assembly) can be completed synchronously.
Further, the active calibration described herein may adjust the relative positions of the first lens component 100 and the second lens component 200 in multiple degrees of freedom. FIG. 7A illustrates relative position adjustment in active calibration in one embodiment of the invention. In this adjustment mode, the first lens component 100 (or the first lens 101) may be movable in the x, y, and z directions relative to the second lens component 200 (i.e., the relative position adjustment in this embodiment has three degrees of freedom). Wherein the z-direction is a direction along the optical axis, and the x-y direction is a direction perpendicular to the optical axis. The x and y directions are both in an adjustment plane P in which translation can be resolved into two components in the x and y directions.
Fig. 7B illustrates rotational adjustment in active calibration in accordance with another embodiment of the present invention. In this embodiment, the relative position adjustment has an increased degree of rotational freedom, i.e., adjustment in the r-direction, in addition to the three degrees of freedom of fig. 7A. In this embodiment, the adjustment in the r-direction is a rotation in the adjustment plane P, i.e. about an axis perpendicular to the adjustment plane P.
Further, fig. 7C illustrates a relative position adjustment manner with increased v, w direction adjustment in active calibration according to yet another embodiment of the present invention. Wherein the v-direction represents the rotation angle of the xoz plane, the w-direction represents the rotation angle of the yoz plane, and the rotation angles of the v-direction and the w-direction may be combined to form a vector angle representing the overall tilt state. That is, by the v-direction and w-direction adjustment, the tilt posture of the first lens component 100 with respect to the second lens component 200 (that is, the tilt of the optical axis of the first lens component 100 with respect to the optical axis of the second lens component 200) can be adjusted.
The above-described adjustment of x, y, z, r, v, w in six degrees of freedom may affect the imaging quality of the optical train (e.g., affect the magnitude of the resolution). In other embodiments of the present invention, the relative position adjustment may be performed by adjusting only any one of the six degrees of freedom, or may be performed by a combination of any two or more of them.
Further, in one embodiment, in the active calibration step, the movement further comprises a translation in the adjustment plane, i.e. a movement in x, y directions.
Further, in one embodiment, the active calibration further comprises: and adjusting and determining the included angle of the axis of the first lens component 100 relative to the axis of the second lens component 200, namely, adjusting in the w and v directions according to the measured resolving power of the optical system (namely, the resolving power measured according to the actual imaging result of the optical system). In the assembled optical lens or camera module, an included angle between the axis of the first lens component 100 and the axis of the second lens component 200 may be different from zero.
Further, in one embodiment, the active calibration further comprises: moving the first lens part 100 in a direction perpendicular to the adjustment plane (i.e. adjustment in the z-direction), determining the relative position between the first lens part 100 and the second lens part 200 in the direction perpendicular to the adjustment plane based on the measured resolving power of the optical system.
Further, in one embodiment, in the pre-positioning step, a gap is provided between the bottom surface of the first lens component 100 and the top surface of the second lens component 200; and in the bonding step, the adhesive is disposed in the gap.
In one embodiment, in the active calibration step, the second lens component 200 may be fixed, the first lens component 100 is clamped by the fixture, and the first lens component 100 is moved under the drive of the six-axis motion mechanism connected with the fixture, so as to implement the relative movement between the first lens component 100 and the second lens component 200 in the six degrees of freedom. Wherein the clamp may bear or partially bear against the side of the first lens part 100, thereby clamping the first lens part 100. In one embodiment, the curvature of the first lens may be greater than the curvature of the second lens such that the first lens component is more sensitive to positional changes than the second lens component, thereby facilitating active calibration. For example, the stroke of the first lens component during active calibration may be reduced, or the adjustment capability of the active calibration may be enhanced (i.e., the ability to compensate for various errors in the manufacturing and assembly steps may be enhanced, with greater adjustment capability meaning that greater errors may be compensated for, thereby allowing the optical system to meet design requirements).
It should be noted that in the above-described embodiment, the number of lenses of the first lens component and the second lens component may be adjusted as needed. For example, the number of lenses of the first lens component and the second lens component may be two and four, or three and three, or four and two, or five and one, respectively. The total number of lenses of the whole optical lens can be adjusted as required, for example, the total number of lenses of the optical lens can be six, or can be five or seven.
It is also noted that the optical lens of the present application is not limited to two, and the number of lens components may be three or four or the like greater than two, for example. When there are more than two lens components constituting the optical lens, the adjacent two lens components can be regarded as the first lens component described above and the second lens component described above, respectively.
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 invention referred to in this application is not limited to the specific combinations of features described above, but it is intended to cover other embodiments in which any combination of features described above or equivalents thereof is possible without departing from the spirit of the invention. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (18)
1. An optical lens, comprising:
a first lens part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and having one bottom first lens located at the lowermost position among the at least one first lens;
A second lens part including a second barrel and at least one second lens mounted to the second barrel, the at least one first lens and the at least one second lens together constituting an imageable optical system, and a bottom surface of a first structural region of the bottom first lens being lower than a top surface of the second barrel; and
the connecting adhesive is positioned between the first lens component and the second lens component and is suitable for supporting the first lens component and the second lens component and fixing the relative position between the first lens component and the second lens component;
wherein the second lens comprises a second optical zone for imaging and a second structural zone outside the second optical zone, the at least one second lens having a top second lens located uppermost therein; and
the connecting adhesive comprises a first adhesive, is positioned between the bottom surface of the first lens barrel and the top surface of the second lens barrel, and is suitable for temporarily supporting and fixing the relative positions of the first lens component and the second lens component after pre-curing; the connecting adhesive material further comprises a second adhesive material, which is positioned between a first bottom surface and a second top surface and is suitable for permanently supporting and fixing the relative positions of the first lens component and the second lens component after solidification, wherein the first bottom surface is the bottom surface of the first structural area of the bottom first lens, and the second top surface is the top surface of the second structural area of the top second lens; the second adhesive material does not contact the second lens barrel.
2. The optical lens of claim 1, wherein the connecting gel is adapted to support and secure the first lens component and the second lens component such that they are maintained in a relative position determined by active calibration, wherein the active calibration is a relative position adjustment of the first lens component and the second lens component based on actual imaging results of the optical system, and wherein the axis of the first lens component and the axis of the second lens component have a non-zero angle therebetween.
3. The optical lens of claim 1, wherein the first adhesive is a photo-setting adhesive and the second adhesive is a thermosetting adhesive.
4. The optical lens of claim 1, wherein the first and second glue materials are both UV thermosets.
5. The optical lens of claim 1, wherein the first bottom surface and the second top surface are each planar surfaces.
6. The optical lens of claim 1, wherein an inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.
7. The optical lens of claim 1, wherein the at least one second lens has a top second lens positioned uppermost, wherein at least one of the light exit surface of the bottom first lens and the light entrance surface of the top second lens is not convex.
8. The optical lens of claim 6, wherein the second structural region of the top second lens includes a bearing region and a bonding region, wherein the side and top surfaces of the bearing region bear against the stepped bearing surface, and the bonding region disposes the second adhesive.
9. The optical lens of claim 1, wherein the second top surface has a glue overflow groove, the glue overflow groove is located at one end of the second top surface near the second optical area, and the second glue is black.
10. The optical lens of claim 1, wherein the first lens component is located at a front end of the optical lens and the second lens component is located at a rear end of the optical lens.
11. An imaging module comprising the optical lens of any one of claims 1-10.
12. An optical lens assembly method, comprising:
Preparing a first lens part including a first barrel and at least one first lens mounted to the first barrel, the first lens including a first optical zone for imaging and a first structural zone other than the first optical zone, and the at least one first lens having one bottom first lens located at the lowermost position, and a second lens part including a second barrel and at least one second lens mounted to the second barrel;
pre-positioning the first lens part and the second lens part so that the at least one first lens and the at least one second lens together form an imageable optical system, and so that the bottom surface of the first structural region of the bottom first lens is lower than the top surface of the second lens barrel;
actively calibrating the relative positions of the first lens component and the second lens component based on the actually measured imaging result of the optical system; and
bonding the first lens part and the second lens part by using a connecting adhesive so as to keep the first lens part and the second lens part at the relative positions determined by active calibration;
Wherein, the step of bonding with the connecting adhesive comprises the following steps: arranging the connecting adhesive on the top surface of the second lens component; moving the first lens component and the second lens component to the relative position determined by active calibration; curing the connecting adhesive;
wherein the step of arranging the connection glue material comprises the following steps: arranging a first adhesive material on the top surface of the second lens barrel, and arranging a second adhesive material on a second top surface, wherein the second top surface is the top surface of a second structural area of a top second lens, the top second lens is the uppermost one of the at least one second lens, and the second structural area is an area of the second lens other than an optical area for optical imaging;
the first adhesive is positioned between the bottom surface of the first lens barrel and the top surface of the second lens barrel, and the second adhesive is positioned between the second top surface and the first bottom surface, wherein the first bottom surface is the bottom surface of the first structural area of the bottom first lens; the second adhesive material does not contact the second lens barrel; and
wherein the step of curing the connection glue material comprises: pre-curing the first adhesive to temporarily support and fix the relative positions of the first lens component and the second lens component; and permanently curing the second adhesive to permanently support and fix the relative positions of the first lens component and the second lens component.
13. The method of assembling an optical lens of claim 12, wherein the step of actively calibrating is performed before the step of disposing the connection glue.
14. The method of assembling an optical lens of claim 12, wherein the step of disposing the connection glue is performed first, and then the step of actively calibrating is performed.
15. The method of assembling an optical lens of claim 12, wherein the pre-curing comprises exposing the first glue material.
16. The method of assembling an optical lens of claim 12, wherein the permanently curing comprises a bake treatment of the first lens component and the second lens component after pre-curing.
17. The method of assembling an optical lens according to claim 12, wherein in the preparing step, an inner side of the second barrel has a stepped bearing surface, and at least a portion of the second top surface bears against the stepped bearing surface.
18. The method of assembling an optical lens of claim 12, wherein the step of actively calibrating comprises: and enabling the interval between the first bottom surface and the second top surface along the optical axis direction to be in the range of less than 80um for active calibration.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810532712.6A CN110542969B (en) | 2018-05-29 | 2018-05-29 | Optical lens, camera module and assembling method thereof |
| PCT/CN2019/088814 WO2019228348A1 (en) | 2018-05-29 | 2019-05-28 | Optical lens, and camera module and assembly method thereof |
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| CN201810532712.6A CN110542969B (en) | 2018-05-29 | 2018-05-29 | Optical lens, camera module and assembling method thereof |
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| CN114764173B (en) * | 2020-12-31 | 2025-02-14 | 江西欧菲光学有限公司 | Lens barrel, lens, multiple lens groups and camera modules |
| CN115268004A (en) * | 2022-05-25 | 2022-11-01 | 江西联创电子有限公司 | High-precision double-group lens and core adjusting method thereof |
| WO2024104458A1 (en) * | 2022-11-17 | 2024-05-23 | 宁波舜宇光电信息有限公司 | Optical lens and camera module |
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