WO2019228348A1 - 光学镜头、摄像模组及其组装方法 - Google Patents

光学镜头、摄像模组及其组装方法 Download PDF

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Publication number
WO2019228348A1
WO2019228348A1 PCT/CN2019/088814 CN2019088814W WO2019228348A1 WO 2019228348 A1 WO2019228348 A1 WO 2019228348A1 CN 2019088814 W CN2019088814 W CN 2019088814W WO 2019228348 A1 WO2019228348 A1 WO 2019228348A1
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WIPO (PCT)
Prior art keywords
lens
optical
component
lens component
glue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/088814
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English (en)
French (fr)
Inventor
田中武彦
蒋恒
刘林
褚水佳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningbo Sunny Opotech Co Ltd
Original Assignee
Ningbo Sunny Opotech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201810532712.6A external-priority patent/CN110542969B/zh
Priority claimed from CN201820813850.7U external-priority patent/CN208432778U/zh
Application filed by Ningbo Sunny Opotech Co Ltd filed Critical Ningbo Sunny Opotech Co Ltd
Publication of WO2019228348A1 publication Critical patent/WO2019228348A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present application relates to the field of optical imaging technology, and in particular, the present application relates to an optical lens, a camera module, and an assembly method thereof.
  • the errors of each component and its assembly include errors such as the optical surface thickness of each lens element, the sagittal height of the optical surface of the lens, the optical surface shape, the radius of curvature, the eccentricity of the single side of the lens and the deflection between the surfaces, and the tilt of the optical surface of the lens.
  • the size depends on the precision of the mold and the ability to control the molding accuracy.
  • the error of the thickness of the lens spacer element depends on the processing accuracy of the element.
  • the error of the assembly and matching of each lens depends on the dimensional tolerance of the component to be assembled and the assembly accuracy of the lens.
  • the error introduced by the change in the refractive index of the lens material depends on the stability of the material and the batch consistency. There is a phenomenon of cumulative deterioration of the errors affecting the resolution of each of the above components. This cumulative error will increase with the number of lenses.
  • Existing resolution solutions are to control the size of each relatively sensitive component and compensate for the rotation of the lens to improve the resolution.
  • the applicant proposes a method for adjusting and determining the relative positions of the upper and lower sub-lenses based on an active calibration process, and then bonding the upper and lower sub-lenses together according to the determined relative positions, thereby manufacturing a complete optical lens or camera module Assembly method.
  • This solution can improve the process capability index (CPK) of mass-produced optical lenses or camera modules; it can enable the evaluation of individual components of materials such as sub-lenses or photosensitive components used to assemble optical lenses or camera modules
  • CPK process capability index
  • the requirements for precision and assembly accuracy have been loosened, thereby reducing the overall cost of the optical imaging lens and the camera module; it can adjust various aberrations of the camera module in real time during the assembly process, reduce the defect rate, reduce production costs, and improve Imaging quality.
  • the present application aims to provide a solution capable of overcoming at least one drawback of the prior art.
  • an optical lens including: a first lens component including a first lens barrel and at least one first lens mounted on the first lens barrel, the first lens including a lens A first optical region for imaging and a first structural region other than the first optical region, and the at least one first lens has a bottom first lens located at the bottom;
  • a second lens component comprising a second lens barrel and at least one second lens mounted on the second lens barrel, the at least one first lens and the at least one second lens together forming an imageable optical system, And the bottom surface of the first structural region of the bottom first lens is lower than the top surface of the second lens barrel; and a connecting glue is located between the first lens component and the second lens component, and It is suitable for supporting the first lens component and the second lens component and fixing the relative position therebetween.
  • the connecting glue is adapted to support and fix the first lens component and the second lens component, so that the two are maintained at a relative position determined by active calibration, and the first lens There is a non-zero included angle between the axis of the component and the axis of the second lens component, wherein the active calibration is performed on the first lens component and the second lens according to the actual imaging result of the optical system.
  • the relative position adjustment of the lens components is adapted to support and fix the first lens component and the second lens component, so that the two are maintained at a relative position determined by active calibration, and the first lens There is a non-zero included angle between the axis of the component and the axis of the second lens component, wherein the active calibration is performed on the first lens component and the second lens according to the actual imaging result of the optical system.
  • the connecting glue material includes a first glue material located between a bottom surface of the first lens barrel and a top surface of the second lens barrel.
  • the second lens includes a second optical region for imaging and a second structural region other than the second optical region, and the at least one second lens has a topmost one Two lenses; and the connecting glue material further includes a second glue material located between the first bottom surface and the second top surface, wherein the first bottom surface is a bottom surface of the first structural region of the bottom first lens, The second top surface is a top surface of a second structural region of the top second lens.
  • the first glue material is adapted to temporarily support and fix the relative positions of the first lens component and the second lens component after pre-curing, and the second glue material is suitable for curing.
  • the rear permanently supports and fixes the relative positions of the first lens component and the second lens component.
  • the first adhesive material is a light-curing adhesive
  • the second adhesive material is a thermosetting adhesive
  • the first glue material and the second glue material are both UV thermosetting glue.
  • the first bottom surface and the second top surface are both flat surfaces.
  • an inner side of the second lens barrel has a stepped bearing surface, and at least a part of the second top surface bears on the stepped bearing surface.
  • the second glue material contacts the second lens barrel.
  • the at least one second lens has a top second lens located at the top, wherein at least one of a light exit surface of the bottom first lens and a light entrance surface of the top second lens Not convex.
  • the second glue material does not contact the second lens barrel.
  • 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 on the stepped bearing surface, and The second adhesive material is arranged in the bonding area.
  • the second top surface has an overflow groove, which is located at an end of the second top surface near the second optical area, and the second glue material is black.
  • the first lens component is located at a front end of the optical lens
  • the second lens component is located at a rear end of the optical lens
  • a camera module is further provided, which includes any one of the optical lenses described above.
  • an optical lens assembly method including: pre-positioning a first lens component and a second lens component, wherein the first lens component includes a first lens barrel and is mounted on the lens barrel.
  • the at least one first lens of the first lens barrel, the first lens includes a first optical region for imaging and a first structural region other than the first optical region, and the at least one first lens has A bottom first lens located at the bottom
  • the second lens component includes a second lens barrel and at least one second lens mounted on the second lens barrel
  • the predetermined position causes the at least one first lens and
  • the at least one second lens collectively constitutes an imageable optical system, and the bottom surface of the first structural region of the bottom first lens is lower than the top surface of the second lens barrel; the actual imaging based on the optical system
  • the relative positions of the first lens component and the second lens component are actively calibrated; and the first lens component and the second lens component are bonded with a connecting adhesive to make the first lens component
  • the step of bonding with a connecting glue material includes: arranging the connecting glue material on a top surface of the second lens component; and moving the first lens component and the second lens component To the relative position determined by active calibration; and curing the connecting glue.
  • the step of actively calibrating is performed first, and then the step of arranging the connecting glue is performed.
  • the step of arranging the connection glue is performed first, and then the step of active calibration is performed.
  • the connecting glue in the step of bonding with a connecting glue, includes a first glue and a second glue, and the step of arranging the connecting glue includes: A first glue material is arranged on the top surface, and a second glue material is arranged on the second top surface, wherein the second top surface is the top surface of the second structural region of the top second lens, and the top second lens is the An uppermost one of the at least one second lens, and the second structural region is an area other than an optical region of the second lens for optical imaging.
  • the first glue material is located between a bottom surface of the first lens barrel and a top surface of the second lens barrel, and the first Two glue materials are located between the second top surface and the first bottom surface, wherein the first bottom surface is the bottom surface of the first structural region of the bottom first lens.
  • the step of curing the connecting glue material includes pre-curing the first glue material to temporarily support and fix the relative positions of the first lens component and the second lens component. And permanently curing the second glue material to permanently support and fix the relative positions of the first lens component and the second lens component.
  • the pre-curing includes exposing the first glue material.
  • the permanent curing includes a baking process of the first lens component and the second lens component after being pre-cured.
  • an inner side of the second lens barrel has a stepped bearing surface, and at least a part of the second top surface bears on the stepped bearing surface.
  • the step of actively calibrating includes: performing an active calibration within a range of less than 80 ⁇ m between a distance between the first bottom surface and the second top surface along an optical axis direction.
  • This application can reduce the total optical length (TTL) of the camera module, thereby reducing the height of the camera module.
  • the split-type assembled optical lens based on active calibration of this application 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).
  • the forming process of the first lens and the second lens is relatively difficult, which helps to save costs and improve production efficiency.
  • the manufacturing process of the second lens component is mature, which can reduce the assembly tolerance of the second lens barrel and the second lens, thereby improving imaging quality and yield.
  • Some embodiments of the present application can suppress the deterioration of imaging quality caused by the secondary variation of the split-type assembled optical lens based on active calibration.
  • Some embodiments of the present application can suppress or prevent the overflow of glue from contaminating the optical system, thereby improving product yield.
  • FIG. 1 shows a schematic longitudinal sectional view of an optical lens 1000 in a comparative example
  • FIG. 2 is a schematic longitudinal sectional view of an optical lens according to an embodiment of the present application.
  • 3A is a schematic longitudinal sectional view of another embodiment of the present application.
  • FIG. 3B shows the top first lens 101 in the embodiment shown in FIG. 3A;
  • FIG. 4A is a schematic longitudinal sectional view of an optical lens according to another embodiment of the present application.
  • FIG. 4B shows the top first lens 101 in the embodiment shown in FIG. 4A;
  • 5A is a schematic longitudinal sectional view of an optical lens according to another embodiment of the present application.
  • FIG. 5B shows the top first lens 101 in the embodiment shown in FIG. 5A;
  • 6A-D illustrate an optical lens assembly process according to an embodiment of the present application
  • FIG. 7A illustrates a relative position adjustment method in active calibration according to an embodiment of the present application
  • FIG. 7C illustrates a relative position adjustment method in which v and w direction adjustments are added in active calibration according to another embodiment of the present application.
  • FIG. 8 shows an autofocus module in an embodiment of the present application
  • FIG. 9 shows an optical lens in an embodiment of the present application.
  • the expressions of the first, second, etc. are only used to distinguish one feature from another feature, and do not indicate any limitation on the feature. Therefore, without departing from the teachings of this application, the first subject discussed below may also be referred to as the second subject.
  • FIG. 2 is a schematic longitudinal sectional view of an optical lens according to an embodiment of the present application.
  • the longitudinal section in this article refers to the section passing through the optical axis, and will not be repeated here.
  • the optical lens of this embodiment includes: a first lens component 100, a second lens component 200, and a connection glue.
  • the first lens component 100 includes a first lens barrel 102 and a first lens 101 mounted on the first lens barrel 102.
  • the first lens 101 includes a first optical area 1011 for imaging and the first lens 101.
  • the second lens component 200 includes a second lens barrel 202 and four second lenses 201 mounted on the second lens barrel 202.
  • the first lens 101 and the four second lenses 201 together form an imageable optical system.
  • a bottom surface of the first structural region 1012 of the first lens 101 is lower than a top surface of the second lens barrel 202.
  • the height of the inner surface of the first lens barrel 102 (referring to the dimension in the direction of the optical axis) can be designed to be smaller than the thickness of the first structural region (referring to the dimension in the direction of the optical axis), so that the first lens is embedded in the first lens barrel.
  • a part of the outer surface of the first lens 101 is exposed outside the inner surface of the first lens barrel 102, and the exposed part sinks into the light-passing hole of the second lens barrel 202, thereby realizing the first lens 101
  • a bottom surface of a structural region 1012 is lower than a top surface of the second lens barrel 202.
  • a connecting adhesive material is located between the first lens component 100 and the second lens component 200, and is adapted to support and fix the first lens component 100 and the second lens component 200 therebetween. Relative position.
  • the connecting adhesive material is suitable for supporting and fixing the first lens component 100 and the second lens component 200 so that the two are maintained at a relative position determined by active calibration, and the first An angle between the axis of the lens component 100 and the axis of the second lens component 200 may be non-zero, wherein the active calibration is performed on the first lens component 100 according to an actual imaging result of the optical system. And the relative position adjustment made by the second lens component 200.
  • active calibration will be further described in combination with the embodiments.
  • the connecting glue material includes a first glue material 301 located between a bottom surface of the first lens barrel 102 and a top surface of the second lens barrel 202.
  • the number of the first lenses 101 may be multiple.
  • one of the plurality of first lenses 101 includes a bottom first lens 101 located at the bottom.
  • a bottom surface of the first structural region 1012 of the bottom first lens 101 is lower than a top surface of the second lens barrel 202.
  • the first lens 101 can be regarded as the bottom first lens 101.
  • the bottom surface of the first structure region 1012 of the bottom first lens 101 is lower than the top surface of the second lens barrel 202, which can make the first lens of the lens (which can be called AOA lens) based on active calibration technology
  • the position 101 is lowered to reduce the total optical length (TTL) of the camera module, thereby reducing the height of the camera module.
  • FIG. 1 is a schematic longitudinal sectional view of an optical lens 1000 in a comparative example.
  • the optical lens 1000 includes a first lens component 100, a second lens component 200, and a connection material.
  • the first lens component 100 includes a first lens 101 and a first lens barrel 102
  • the second lens component 200 includes a second lens barrel 202 and a plurality of second lenses 201.
  • the second lens barrel 202 has a multi-stage stepped abutment surface 2022 inside, and the plurality of second lenses 201 are inserted into the multi-stage stepped abutment surface 2022 in order from small to large.
  • the design size of the topmost second lens 201 is usually small, and the top area 2021 of the second lens barrel is often between the first lens 101 and the second lens 201.
  • an active calibration station needs to be reserved.
  • the gap D between the bottom surface of the structure area of the first lens 101 and the top surface of the structure area of the second lens 201 is designed.
  • the thickness of the top region 2021 of the second lens barrel 202 between the two lenses 201 is determined.
  • the shape of each lens must take into account the distance D described above, so that active calibration has the required space for movement.
  • the optical design stage need not consider the top region 2021 of the second lens barrel 202. In this way, in the surface design, the position of the first lens 101 of the AOA lens can be sunk, thereby reducing the total optical length (TTL) of the camera module, thereby reducing the height of the camera module.
  • TTL total optical length
  • FIG. 3A shows a schematic longitudinal sectional view of another embodiment of the present application.
  • FIG. 3B shows the top first lens 101 in the embodiment shown in FIG. 3A. 3A and 3B, in this embodiment, the second lens 201 includes a second optical region 2011 for imaging and a second structural region other than the second optical region 2011, and the plurality of second lenses 201 has a top second lens 201 located at the top.
  • the connecting glue material includes a first glue material 301 and a second glue material 302.
  • the first glue material 301 is located between the bottom surface of the first lens barrel 102 and the top surface of the second lens barrel 202.
  • the second glue material 302 is located between the first bottom surface 1013 and the second top surface 2013, wherein the first bottom surface 1013 is the bottom surface of the first structural region 1012 of the bottom first lens 101, and the second top surface 2013 Is the top surface of the second structure region 2012 of the top second lens 201.
  • the first glue 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 301 is adapted to permanently support and fix the relative positions of the first lens component 100 and the second lens component 200 after curing.
  • the first adhesive material 301 may be a light-curing adhesive
  • the second adhesive material 302 may be a thermosetting adhesive.
  • the first glue material 301 and the second glue material 302 may both be UV thermosetting glue.
  • the second glue 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 to ensure the relative positions determined by active calibration, which can suppress the The secondary variation (for example, the secondary variation caused by the unstable combination of the first lens barrel 102 and the first lens 101) can be prevented from deteriorating the imaging quality.
  • the surfaces of the structural regions of the first lens 101 and the second lens 201 are flat surfaces. The forming process of the first lens 101 and the second lens 201 is relatively low, which helps to save costs and improve production efficiency.
  • the first bottom surface 1013 and the second top surface 2013 are both flat surfaces.
  • a stepped bearing surface 2022 is provided on the inner side of the second lens barrel 202, and at least a part of the second top surface 2013 bears on the stepped bearing surface 2022.
  • the manufacturing process of the second lens component 200 is mature, which can reduce the assembly tolerance of the second lens barrel 202 and the second lens 201, thereby improving the imaging quality and the yield.
  • the second glue material 302 contacts the second lens barrel 202.
  • the second glue 302 may be black.
  • the black second plastic material 302 helps to block stray light from entering the optical system from the second structure region 2012.
  • the second glue material 302 does not contact the second lens barrel 202.
  • the first lens 101 and the second lens 201 are directly fixed and supported by the second rubber material 302, which can suppress the deterioration of the imaging quality caused by the secondary variation.
  • it can suppress the secondary variation caused by the unstable combination of the first lens barrel 102 and the first lens 101, and can also prevent the variation caused by the lens barrel (such as the first and second lens barrels being heated or mutated after being wet).
  • the position or shape of the first lens 101 varies.
  • FIG. 4A is a schematic longitudinal sectional view of an optical lens according to another embodiment of the present application.
  • FIG. 4B shows the top first lens 101 in the embodiment shown in FIG. 4A.
  • the second structural region 2012 of the top second lens 201 includes a bearing region 2014 and a bonding region 2015, wherein the side and top surfaces of the bearing region bear on The step-shaped bearing surface 2022 and the second adhesive material 302 are arranged in the bonding area.
  • Fig. 5A shows a schematic longitudinal sectional view of an optical lens according to another embodiment of the present application.
  • Fig. 5B shows the top first lens 101 in the embodiment shown in Fig. 5A.
  • the second top surface 2013 may have an overflow groove 2019, which is located near the second optical area 2011 on the second top surface 2013.
  • the second glue material 302 may be black. This embodiment can prevent the second glue 302 from contaminating the optical area, and avoid the defects caused by the smearing of the captured image, thereby improving the yield of the optical lens or camera module.
  • the first lens component 100 is located at a front end of the optical lens
  • the second lens component 200 is located at a rear end of the optical lens.
  • the first lens has a bottom first lens located at the bottommost end
  • the second lens has a top second lens located at the topmost position.
  • at least one of the light-emitting surface of the bottom first lens and the light-incident surface of the top second lens is not convex. That is, when the light-emitting surface of the bottom first lens is convex, the light-incident surface of the top second lens is concave or flat; when the light-incident surface of the top second lens is convex, the light-emitting surface of the bottom first lens is concave or flat .
  • FIG. 9 shows an optical lens in an embodiment of the present application. As shown in FIG. 9, the light exit surface of the first lens at the bottom is concave, and the light entrance surface of the second lens at the top is convex. In addition, the figure shows an adhesive 1019 that bonds the first lens and the first lens barrel.
  • first bottom surface (the bottom surface of the first structural region of the bottom first lens) described below is lower than the top surface of the second lens barrel means that the first bottom surface as a whole is lower than the second lens The top surface of the tube.
  • a camera module is also provided.
  • the camera module may include an optical lens in any one of the foregoing embodiments.
  • the camera module may include an optical lens and a photosensitive component.
  • the optical lens is mounted and fixed on the photosensitive member.
  • the photosensitive module has a photosensitive chip.
  • the camera module can be a fixed focus module or other types of modules such as an autofocus module.
  • Fig. 8 shows an autofocus module in an embodiment of the present application, wherein the second lens component 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 mount 409 of the photosensitive element.
  • a method for assembling an optical lens is further provided, which includes steps S10 to S30.
  • the first lens component 100 and the second lens component 200 are pre-positioned.
  • the first lens component 100 includes a first lens barrel 102 and at least one first lens 101 mounted on the first lens barrel 102.
  • the first lens 101 includes a first optical region 1011 for imaging and the A first structure region 1012 other than the first optical region 1011, and the at least one first lens 101 has a bottom first lens 101 at the bottom
  • the second lens component 200 includes a second lens barrel 202 and a mounting At least one second lens 201 on the second lens barrel 202.
  • the inside of the second lens barrel 202 may have a stepped bearing surface 2022, and at least a part of the second top surface 2013 bears on the stepped bearing surface 2022.
  • the predetermined position causes the at least one first lens 101 and the at least one second lens 201 to form an imageable optical system together, and the bottom surface of the first structure region 1012 of the bottom first lens 101 is lower than the bottom surface.
  • the top surface of the second lens barrel 202 is described.
  • Step S20 Actively calibrate the relative positions of the first lens component 100 and the second lens component 200 based on the measured imaging results of the optical system.
  • step S30 the first lens component 100 and the second lens component 200 are bonded with a connecting adhesive material, so that the first lens component 100 and the second lens component 200 are maintained at a relative position determined by active calibration. position.
  • step S40 includes: arranging the connecting glue on the top surface of the second lens component 200; moving the first lens component 100 and the second lens component 200 to active Calibrating the determined relative position; and curing the connecting glue.
  • the step of actively calibrating may be performed before the step of arranging the connecting glue.
  • the step of arranging the connecting glue material may be performed first, and then the step of active calibration is performed.
  • the step of curing the connecting glue includes: pre-curing the first glue 301 to temporarily support and fix the first lens component 100 and the first lens member 100.
  • the relative position of the second lens component 200; and the second glue material is permanently cured to permanently support and fix the relative position of the first lens component 100 and the second lens component 200.
  • the pre-curing may include exposing the first glue 301.
  • the permanent curing may include a baking process of the first lens component 100 and the second lens component 200 after being pre-cured.
  • FIG. 6A to 6D illustrate an optical lens assembly process according to an embodiment of the present application.
  • FIG. 6A shows a schematic diagram of performing glue in an embodiment of the present application.
  • first a first lens component 100 and a second lens component 200 are manufactured separately, and then glue is applied on the top surface of the second lens component 200.
  • the connecting glue material includes a first glue material 301 and a second glue material 305.
  • the first glue material 301 is located on a bottom surface of the first lens barrel 102 and a top of the second lens barrel 202.
  • the second rubber material 301 is located between the second top surface 2013 and the first bottom surface 1013, wherein the first bottom surface 1013 is a first structural region of the bottom first lens 101 1012 underside.
  • the step of arranging the connecting glue material includes: arranging a first glue material 301 on a top surface of the second lens barrel 202, and arranging a second glue material 302 on a second top surface 2013, wherein the second The top surface 2013 is a top surface of the second structural region 2012 of the top second lens 201, and the top second lens 201 is a second lens 201 located at the uppermost of the at least one second lens 201, and the second The structural region 2012 is a region other than the optical region of the second lens 201 for optical imaging.
  • FIG. 6B is a schematic diagram of arranging the first lens component 100 and the second lens component 200 to a relative position determined by active calibration in an embodiment of the present application.
  • the active calibration can be completed and recorded the corresponding coordinates before the glue is painted, and the first lens component 100 and the second lens component 200 are arranged according to the recorded coordinates after the glue is painted to restore the two to the relative positions determined by the active calibration. position.
  • the active calibration can also be performed after the glue is taken.
  • the pre-positioning (step S20) and the active calibration (step S30) can be performed after the glue is taken, and the first lens component 100 and the second lens that reach the imaging quality standard are determined according to the measured resolution.
  • the relative position of the lens component 200 FIG. 6C shows a schematic diagram of pre-curing in one embodiment of the present application.
  • the pre-curing is completed by an exposure process, where the arrows schematically give the direction of light.
  • the first lens component 100 and the second lens component 200 are maintained at a relative position determined by active calibration by an external pickup mechanism (such as a clamping mechanism).
  • the relative position determined by the active calibration can be maintained by fixing and supporting the first glue 301 after the pre-curing.
  • Fig. 6D shows a schematic diagram of permanent curing in one embodiment of the present application.
  • curing of the second rubber material 302 can be achieved by integrally baking the pre-cured semi-finished product.
  • the second adhesive material 302 may be a thermosetting adhesive or a UV thermosetting adhesive. Since the thermosetting can have a stronger adhesive effect, permanent curing can be achieved, that is, the first lens component 100 and the second lens component 200 are permanently combined. And this combination has many advantages such as high reliability and good weather resistance.
  • the step of actively calibrating includes: making a distance between the first bottom surface 1013 and the second top surface 2013 along an optical axis direction within a range of less than 80 ⁇ m. For active calibration. Because the first lens adopts a sunken design, the design gap between the first lens at the bottom and the second lens at the top can be reduced during the optical design stage (referring to the structure region of the bottom first lens and the structure region of the second top lens) Design gap).
  • a method for manufacturing a camera module includes: manufacturing an optical lens by using the optical lens manufacturing method in the foregoing embodiment; and mounting the optical lens on a photosensitive component to obtain an optical lens. Mentioned camera module.
  • an optical lens may be manufactured first, and then the optical lens may be mounted on the photosensitive component; it may also be an assembly of the optical lens (such as the adhesion of the first lens component and the second lens component) and the optical lens The assembly of the photosensitive component (such as the adhesion of the second lens component to the photosensitive component) is completed simultaneously.
  • FIG. 7A illustrates a relative position adjustment method in active calibration according to an embodiment of the present application.
  • the first lens component 100 also the first lens 101
  • the second lens component 200 that is, the relative position in this embodiment.
  • Adjustment has three degrees of freedom).
  • the z direction is a direction along the optical axis
  • the x and y directions are directions perpendicular to the optical axis. Both the x and y directions are in an adjustment plane P, and the translation in the adjustment plane P can be decomposed into two components in the x and y directions.
  • FIG. 7B illustrates rotation adjustment in active calibration according to another embodiment of the present application.
  • the relative position adjustment in addition to the three degrees of freedom of FIG. 7A, the relative position adjustment also increases the degree of freedom of rotation, that is, the adjustment in the r direction.
  • the adjustment in the r direction is a rotation in the adjustment plane P, that is, a rotation about an axis perpendicular to the adjustment plane P.
  • FIG. 7C shows a relative position adjustment method in which v and w direction adjustments are added in active calibration according to another embodiment of the present application.
  • the v direction represents the rotation angle of the xoz plane
  • the w direction represents the rotation angle of the yoz plane
  • the rotation angles of the v direction and the w direction can be combined into a vector angle
  • this vector angle represents the total tilt state. That is, by adjusting the v direction and the w direction, the tilting attitude of the first lens component 100 relative to the second lens component 200 (that is, the optical axis of the first lens component 100 relative to the second lens component can be adjusted. 200 optical axis tilt).
  • the relative position adjustment method may be to adjust only any one of the above six degrees of freedom, or a combination of any two or more of them.
  • the movement further includes a translation on the adjustment plane, that is, a movement in the x and y directions.
  • the active calibration further includes: adjusting and determining the first lens component 100 according to a measured resolution of the optical system (referring to a resolution measured according to an actual imaging result of the optical system).
  • a measured resolution of the optical system referring to a resolution measured according to an actual imaging result of the optical system.
  • An included angle of the axis of the axis with respect to the axis of the second lens component 200 that is, adjustment in the w and v directions.
  • an angle between the axis of the first lens component 100 and the axis of the second lens component 200 may be non-zero.
  • the active calibration further includes: moving the first lens component 100 (ie, adjustment in the z direction) along a direction perpendicular to the adjustment plane, according to the actual measurement of the optical system
  • the resolving power determines a relative position between the first lens component 100 and the second lens component 200 in a direction perpendicular to the adjustment plane.
  • a gap is formed between a bottom surface of the first lens component 100 and a top surface of the second lens component 200; and in the bonding step, The glue material is arranged in the gap.
  • the second lens component 200 may be fixed, the first lens component 100 may be clamped by a clamp, and the first lens component 100 may be moved by a six-axis movement mechanism connected to the clamp, thereby The relative movement between the first lens component 100 and the second lens component 200 in the above six degrees of freedom is achieved.
  • the jig may be abutted or partially abutted on a side surface of the first lens component 100 so as to clamp the first lens component 100.
  • the curvature of the first lens may be greater than the curvature of the second lens, so that the sensitivity of the first lens component to a change in position is greater than that of the second lens component, thereby facilitating active calibration.
  • the number of lenses of the first lens component and the second lens component may be adjusted as needed.
  • the number of lenses of the first lens component and the second lens component may be two and four, respectively, three and three, four and two, and five and one, respectively.
  • the total number of lenses of the entire optical lens can also be adjusted as needed.
  • the total number of lenses of the optical lens can be six, or five or seven.
  • the lens components are not limited to two, for example, the number of lens components may also be a number greater than two, such as three or four.
  • two adjacent lens components may be regarded as the first lens component and the second lens component described above, respectively.

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Abstract

一种光学镜头，包括：第一镜头部件(100)，其包括第一镜筒(102)和至少一个第一镜片(101)，第一镜片包括第一光学区(1011)和第一结构区(1012)，第一镜片中位于最下方的为底部第一镜片；第二镜头部件(200)，其包括第二镜筒(202)和至少一个第二镜片(201)，第一镜片和第二镜片共同构成可成像的光学系统，并且底部第一镜片的第一结构区的底面低于第二镜筒的顶面；以及连接胶材(301)，其位于第一镜头部件与第二镜头部件之间，并且适于支撑第一镜头部件与第二镜头部件并固定二者之间的相对位置。还提供了相应的摄像模组及组装方法。可以减小摄像模组的光学总长，进而减小摄像模组的高度；可以提升成像品质。

Description

光学镜头、摄像模组及其组装方法
相关申请的交叉引用
本申请要求于2018年5月29日递交于中国国家知识产权局(CNIPA)的、申请号为201810532712.6、发明名称为“光学镜头、摄像模组及其组装方法”的中国发明专利申请以及于2018年5月29日递交于CNIPA的、申请号为201820813850.7、发明名称为“光学镜头及摄像模组”的中国实用新型专利申请的优先权和权益，这两项申请通过引用整体并入本文。
技术领域
本申请涉及光学成像技术领域，具体地说，本申请涉及光学镜头、摄像模组及其组装方法。
背景技术
随着移动电子设备的普及，被应用于移动电子设备的用于帮助使用者获取影像(例如视频或者图像)的摄像模组的相关技术得到了迅猛的发展和进步，并且在近年来，摄像模组在诸如医疗、安防、工业生产等诸多的领域都得到了广泛的应用。
为了满足越来越广泛的市场需求，高像素、小尺寸、大光圈是现有摄像模组不可逆转的发展趋势。然而，要在同一摄像模塑实现高像素、小尺寸、大光圈三个方面的需求是有很大难度的。例如，手机的紧凑型发展和手机屏占比的增加，让手机内部能够用于前置摄像模组的空间越来越小，而市场对摄像模组的成像质量又提出了越来越高的需求。
在紧凑型摄像模组(例如用于手机的摄像模组)领域，往往需要考虑到光学成像镜头的品质和模组封装过程中的制造误差。具体来说，在光学成像镜头的制造过程中，影响镜头解像力因素来自于各元件及 其装配的误差、镜片间隔元件厚度的误差、各镜片的装配配合的误差以及镜片材料折射率的变化等。其中，各元件及其装配的误差包含各镜片单体的光学面厚度、镜片光学面矢高、光学面面型、曲率半径、镜片单面及面间偏心，镜片光学面倾斜等误差，这些误差的大小取决于模具精度与成型精度控制能力。镜片间隔元件厚度的误差取决于元件的加工精度。各镜片的装配配合的误差取决于被装配元件的尺寸公差以及镜头的装配精度。镜片材料折射率的变化所引入的误差则取决于材料的稳定性以及批次一致性。上述各个元件影响解像力的误差存在累积恶化的现象，这个累计误差会随着透镜数量的增多而不断增大。现有解像力解决方案为对于对各相对敏感度高的元件的尺寸进行公差控制、镜片回转进行补偿提高解像力，但是由于高像素大光圈的镜头较敏感，要求公差严苛，如：部分敏感镜头1μm镜片偏心会带来9′像面倾斜，导致镜片加工及组装难度越来越大，同时由于在组装过程中反馈周期长，造成镜头组装的过程能力指数(CPK)低、波动大，导致不良率高。且如上所述，因为影响镜头解像力的因素非常多，存在于多个元件中，每个因素的控制都存在制造精度的极限，如果只是单纯提升各个元件的精度，提升能力有限，提升成本高昂，而且不能满足市场日益提高的成像品质需求。
本申请人提出了一种基于主动校准工艺调整和确定上、下子镜头的相对位置，然后将上、下子镜头按照所确定的相对位置粘结在一起，进而制造出完整的光学镜头或摄像模组的组装方法。这种解决方案能够提升大批量生产的光学镜头或摄像模组的过程能力指数(CPK)；能够使得对物料(例如用于组装光学镜头或摄像模组的子镜头或感光组件)的各个元件的精度及其装配精度的要求变宽松，进而降低光学成像镜头以及摄像模组的整体成本；能够在组装过程中对摄像模组的各种像差进行实时调整，降低不良率，降低生产成本，提升成像品质。
然而，为给主动校准留下空间，上子镜头的底面和下子镜头的顶面之间往往需要在设计上留下一定的间隙，这个间隙造成基于主动校准工艺的镜头的高度(指沿着光轴方向上的尺寸)往往大于单体式镜头(指仅有单个镜筒的镜头)。镜头或摄像模组的高度过大往往是制约 终端设备(例如手机)尺寸减小(例如减小手机厚度)的重要因素之一。
另一方面，对镜头的光学系统本身进行主动校准是一种新的生产工艺，实际量产需要考虑光学镜头和摄像模组的可靠性、抗摔性、耐候性以及制作成本等诸多因素，有时还需要面对各种不可测因素而导致的良率下降。例如，在一种工艺方案中，在第一镜头部件和第二镜头部件之间填充胶材，以使第一镜头部件和第二镜头部件保持在主动校准所确定的相对位置。然而实际试产发现，光学镜头和摄像模组的成像品质相比主动校准阶段所获得的成像品质常常出现劣化，这种劣化有时会超出容忍范围，导致产品不良。申请人研究发现，在光学镜头或摄像模组的组装中引入主动校准工艺后，胶材、镜筒或镜片的变异以及其它未知因素，均可能是导致上述问题的原因。当前迫切需要能够克服上述问题的解决方案，以便提升产品良率。
发明内容
本申请旨在提供一种能够克服现有技术的至少一个缺陷的解决方案。
根据本申请的一个方面，提供了一种光学镜头，包括：第一镜头部件，其包括第一镜筒和安装于所述第一镜筒的至少一个第一镜片，所述第一镜片包括用于成像的第一光学区和所述第一光学区以外的第一结构区，并且所述至少一个第一镜片中具有位于最下方的一个底部第一镜片；
第二镜头部件，其包括第二镜筒和安装于所述第二镜筒的至少一个第二镜片，所述至少一个第一镜片和所述至少一个第二镜片共同构成可成像的光学系统，并且所述底部第一镜片的第一结构区的底面低于所述第二镜筒的顶面；以及连接胶材，其位于所述第一镜头部件与所述第二镜头部件之间，并且适于支撑所述第一镜头部件与所述第二镜头部件并固定二者之间的相对位置。
在一个实施例中，所述连接胶材适于支撑和固定所述第一镜头部件与所述第二镜头部件，以使二者保持在主动校准所确定的相对位置， 并且所述第一镜头部件的轴线与所述第二镜头部件的轴线之间具有不为零的夹角，其中所述主动校准是根据所述光学系统的实际成像结果而对所述第一镜头部件和所述第二镜头部件所做的相对位置调整。
在一个实施例中，所述连接胶材包括第一胶材，其位于所述第一镜筒的底面和所述第二镜筒的顶面之间。
在一个实施例中，所述第二镜片包括用于成像的第二光学区和所述第二光学区以外的第二结构区，所述至少一个第二镜片中具有位于最上方的一个顶部第二镜片；以及所述连接胶材还包括第二胶材，其位于第一底面和第二顶面之间，其中所述第一底面是所述底部第一镜片的第一结构区的底面，所述第二顶面是所述顶部第二镜片的第二结构区的顶面。
在一个实施例中，所述第一胶材适于在预固化后临时支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置，以及所述第二胶材适于在固化后永久支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置。
在一个实施例中，所述第一胶材为光固胶，以及所述第二胶材为热固胶。
在一个实施例中，所述第一胶材和所述第二胶材均为UV热固胶。
在一个实施例中，所述第一底面和所述第二顶面均为平坦面。
在一个实施例中，所述第二镜筒的内侧具有台阶状承靠面，并且所述第二顶面的至少一部分承靠于所述台阶状承靠面。
在一个实施例中，所述第二胶材接触所述第二镜筒。
在一个实施例中，所述至少一个第二镜片中具有位于最上方的一个顶部第二镜片，其中所述底部第一镜片的出光面和所述顶部第二镜片的入光面中的至少一个不为凸面。
在一个实施例中，所述第二胶材不接触所述第二镜筒。
在一个实施例中，所述顶部第二镜片的第二结构区包括承靠区和粘结区，其中所述承靠区的侧面和顶面承靠于所述台阶状承靠面，且所述粘结区布置所述第二胶材。
在一个实施例中，所述第二顶面具有溢胶槽，所述溢胶槽位于所 述第二顶面的靠近所述第二光学区的一端，所述第二胶材为黑色。
在一个实施例中，所述第一镜头部件位于所述光学镜头的前端，且所述第二镜头部件位于所述光学镜头的后端。
根据本申请的另一方面，还提供了一种摄像模组，其包括上述任一光学镜头。
根据本申请的另一方面，还提供了一种光学镜头组装方法，包括：对第一镜头部件和第二镜头部件进行预定位，其中所述第一镜头部件包括第一镜筒和安装于所述第一镜筒的至少一个第一镜片，所述第一镜片包括用于成像的第一光学区和所述第一光学区以外的第一结构区，并且所述至少一个第一镜片中具有位于最下方的一个底部第一镜片，所述第二镜头部件包括第二镜筒和安装于所述第二镜筒的至少一个第二镜片，所述预定位使所述至少一个第一镜片和所述至少一个第二镜片共同构成可成像的光学系统，并使所述底部第一镜片的第一结构区的底面低于所述第二镜筒的顶面；基于所述光学系统的实测成像结果对所述第一镜头部件和所述第二镜头部件的相对位置进行主动校准；以及用连接胶材粘合所述第一镜头部件与所述第二镜头部件，以使所述第一镜头部件与所述第二镜头部件保持在主动校准所确定的相对位置。
在一个实施例中，所述用连接胶材粘合的步骤包括：在所述第二镜头部件的顶面布置所述连接胶材；将所述第一镜头部件和所述第二镜头部件移动至主动校准所确定的相对位置；以及使所述连接胶材固化。
在一个实施例中，先执行所述主动校准的步骤，再执行布置所述连接胶材的步骤。
在一个实施例中，先执行布置所述连接胶材的步骤，再执行所述主动校准的步骤。
在一个实施例中，所述用连接胶材粘合的步骤中，所述连接胶材包括第一胶材和第二胶材，布置所述连接胶材的步骤包括：在第二镜筒的顶面布置第一胶材，以及在第二顶面布置第二胶材，其中所述第二顶面是顶部第二镜片的第二结构区的顶面，所述顶部第二镜片是所 述至少一个第二镜片中位于最上方的一个第二镜片，所述第二结构区是第二镜片的用于光学成像的光学区以外的区域。
在一个实施例中，所述用连接胶材粘合的步骤中，所述第一胶材位于所述第一镜筒的底面和所述第二镜筒的顶面之间，并且所述第二胶材位于所述第二顶面和所述第一底面之间，其中所述第一底面是所述底部第一镜片的第一结构区的底面。
在一个实施例中，所述使所述连接胶材固化的步骤包括：将所述第一胶材预固化使其临时支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置；以及将所述第二胶材永久固化使其永久支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置。
在一个实施例中，所述预固化包括对第一胶材进行曝光处理。
在一个实施例中，所述永久固化包括对预固化后的所述第一镜头部件和所述第二镜头部件的烘烤处理。
在一个实施例中，所述第二镜筒的内侧具有台阶状承靠面，并且所述第二顶面的至少一部分承靠于所述台阶状承靠面。
在一个实施例中，所述主动校准的步骤包括：使所述第一底面和所述第二顶面之间沿着光轴方向的间距在小于80μm范围内进行主动校准。
与现有技术相比，本申请具有下列至少一个技术效果：
1、本申请可以减小摄像模组的光学总长(TTL)，进而减小摄像模组的高度。
2、本申请的基于主动校准的分体式组装光学镜头可以提升光学镜头和摄像模组的成像品质，特别适合于紧凑型摄像模组(例如手机摄像模组)。
3、在本申请的一些实施例中，第一镜片和第二镜片成形的工艺难度较低，有助于节省成本，提高生产效率。
4、在本申请的一些实施例中，第二镜头部件的制作工艺成熟，可降低第二镜筒与第二镜片的组装公差，进而提升成像品质，提升良率。
5、本申请的一些实施例可抑制基于主动校准的分体式组装光学镜头的二次变异造成的成像品质的劣化。
本申请的一些实施例可抑制或防止溢胶污染光学系统，从而提高产品良率。
附图说明
在参考附图中示出示例性实施例。本文中公开的实施例和附图应被视作说明性的，而非限制性的。
图1示出了一个比较例中的光学镜头1000的纵剖面示意图；
图2示出了本申请一个实施例的光学镜头的纵剖面示意图；
图3A示出了本申请另一个实施例的纵剖面示意图；
图3B示出了图3A所示实施例中的顶端第一镜片101；
图4A示出了本申请又一个实施例的光学镜头的纵剖面示意图；
图4B示出了图4A所示实施例中的顶端第一镜片101；
图5A示出了本申请再一个实施例的光学镜头的纵剖面示意图；
图5B示出了图5A所示实施例中的顶端第一镜片101；
图6A～D示出了本申请一个实施例的光学镜头组装过程；
图7A示出了本申请一个实施例中的主动校准中相对位置调节方式；
图7B示出了本申请另一个实施例的主动校准中的旋转调节；
图7C示出了本申请又一个实施例的主动校准中的增加了v、w方向调节的相对位置调节方式；
图8示出了本申请一个实施例中的自动对焦模组；
图9示出了本申请一个实施例中的光学镜头。
具体实施方式
为了更好地理解本申请，将参考附图对本申请的各个方面做出更详细的说明。应理解，这些详细说明只是对本申请的示例性实施方式的描述，而非以任何方式限制本申请的范围。在说明书全文中，相同的附图标号指代相同的元件。表述“和/或”包括相关联的所列项目中的 一个或多个的任何和全部组合。
应注意，在本说明书中，第一、第二等的表述仅用于将一个特征与另一个特征区分开来，而不表示对特征的任何限制。因此，在不背离本申请的教导的情况下，下文中讨论的第一主体也可被称作第二主体。
在附图中，为了便于说明，已稍微夸大了物体的厚度、尺寸和形状。附图仅为示例而并非严格按比例绘制。
还应理解的是，用语“包括”、“包括有”、“具有”、“包含”和/或“包含有”，当在本说明书中使用时表示存在所陈述的特征、整体、步骤、操作、元件和/或部件，但不排除存在或附加有一个或多个其它特征、整体、步骤、操作、元件、部件和/或它们的组合。此外，当诸如“...中的至少一个”的表述出现在所列特征的列表之后时，修饰整个所列特征，而不是修饰列表中的单独元件。此外，当描述本申请的实施方式时，使用“可以”表示“本申请的一个或多个实施方式”。并且，用语“示例性的”旨在指代示例或举例说明。
如在本文中使用的，用语“基本上”、“大约”以及类似的用语用作表近似的用语，而不用作表程度的用语，并且旨在说明将由本领域普通技术人员认识到的、测量值或计算值中的固有偏差。
除非另外限定，否则本文中使用的所有用语(包括技术用语和科学用语)均具有与本申请所属领域普通技术人员的通常理解相同的含义。还应理解的是，用语(例如在常用词典中定义的用语)应被解释为具有与它们在相关技术的上下文中的含义一致的含义，并且将不被以理想化或过度正式意义解释，除非本文中明确如此限定。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。下面将参考附图并结合实施例来详细说明本申请。
图2示出了本申请一个实施例的光学镜头的纵剖面示意图。本文中纵剖面指经过光轴的剖面，下文中不再赘述。参考图2，本实施例的光学镜头包括：第一镜头部件100、第二镜头部件200和连接胶材。其中，第一镜头部件100包括第一镜筒102和安装于所述第一镜筒102 的一个第一镜片101，所述第一镜片101包括用于成像的第一光学区1011和所述第一光学区1011以外的第一结构区1012。第二镜头部件200包括第二镜筒202和安装于所述第二镜筒202的四个第二镜片201，所述第一镜片101和四个第二镜片201共同构成可成像的光学系统，并且所述第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面。例如可以将第一镜筒102的内侧面高度(指光轴方向上的尺寸)设计成小于第一结构区的厚度(指光轴方向上的尺寸)，这样在第一镜片嵌入第一镜筒后，第一镜片101的外侧面的一部分暴露在第一镜筒102的内侧面以外，并且暴露在外的部分下沉至第二镜筒202的通光孔中，从而实现第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面。进一步地，连接胶材位于所述第一镜头部件100与所述第二镜头部件200之间，并且适于支撑所述第一镜头部件100与所述第二镜头部件200并固定二者之间的相对位置。本实施例中，所述连接胶材适于支撑和固定所述第一镜头部件100与所述第二镜头部件200，以使二者保持在主动校准所确定的相对位置，并且所述第一镜头部件100的轴线与所述第二镜头部件200的轴线之间可以具有不为零的夹角，其中所述主动校准是根据所述光学系统的实际成像结果而对所述第一镜头部件100和所述第二镜头部件200所做的相对位置调整。下文中，还会结合实施例对主动校准做进一步地描述。本实施例中，所述连接胶材包括第一胶材301，其位于所述第一镜筒102的底面和所述第二镜筒202的顶面之间。
需注意，在另一实施例中，第一镜片101的数目也可以为多个。此时，多个第一镜片101中具有一个位于最下方的底部第一镜片101。并且所述底部第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面。另外，容易理解，当第一镜片101仅有一个时(例如图2所示)，则该第一镜片101可以视为所述的底部第一镜片101。
上述实施例中，底部第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面，可以使得基于主动校准技术的镜头(可以称为AOA镜头)的第一镜片101位置下沉，减小摄像模组的光学总长(TTL)，进而减小摄像模组的高度。
为使上述技术效果更易于理解，下面结合图1的比较例进行说明。图1示出了一个比较例中的光学镜头1000的纵剖面示意图。该光学镜头1000包括第一镜头部件100、第二镜头部件200和连接胶材。第一镜头部件100包括第一镜片101和第一镜筒102，第二镜头部件200包括第二镜筒202和多个第二镜片201。第二镜筒202内侧具有多级台阶状的承靠面2022，所述多个第二镜片201由小至大依次嵌入所述的多级台阶状的承靠面2022。在设计上，最顶端的第二镜片201的设计尺寸通常较小，第二镜筒的顶部区域2021往往介于第一镜片101与第二镜片201之间，再加上需要预留主动校准所需的间隙，因此在设计上第一镜片101的结构区底面与第二镜片201的结构区顶面之间的距离D由预留的主动校准所需的间隙和介于第一镜片101与第二镜片201之间的第二镜筒202的顶部区域2021的厚度决定。在光学设计阶段，各个镜片的面型就必须考虑到上述距离D，这样以使主动校准具有所需的活动空间。而本申请中，通过使底部第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面，可以使得光学设计阶段不需要考虑第二镜筒202的顶部区域2021的厚度，这样在面型设计上可以使AOA镜头的第一镜片101位置下沉，从而减小摄像模组的光学总长(TTL)，进而减小摄像模组的高度。
进一步地，图3A示出了本申请另一个实施例的纵剖面示意图。图3B示出了图3A所示实施例中的顶端第一镜片101。参考图3A和图3B，本实施例中，所述第二镜片201包括用于成像的第二光学区2011和所述第二光学区2011以外的第二结构区，所述多个第二镜片201中具有位于最上方的一个顶部第二镜片201。所述连接胶材包括第一胶材301和第二胶材302。第一胶材301位于所述第一镜筒102的底面和所述第二镜筒202的顶面之间。第二胶材302位于第一底面1013和第二顶面2013之间，其中所述第一底面1013是所述底部第一镜片101的第一结构区1012的底面，所述第二顶面2013是所述顶部第二镜片201的第二结构区2012的顶面。所述第一胶材301适于在预固化后临时支撑和固定所述第一镜头部件100与所述第二镜头部件200的相对位置。所述第二胶材301适于在固化后永久支撑和固定所 述第一镜头部件100与所述第二镜头部件200的相对位置。本实施例中，所述第一胶材301可以为光固胶，以及所述第二胶材302可以为热固胶。在另一实施例中，所述第一胶材301和所述第二胶材302可以均为UV热固胶。本实施例中，第二胶材302位于第一镜片101与第二镜片201之间，以固定和支撑第一镜头部件100和第二镜头部件200保证在主动校准所确定的相对位置，可抑制二次变异(例如可以抑制因第一镜筒102与第一镜片101结合不稳所导致的二次变异)造成的成像品质的劣化。并且，本实施例中，第一镜片101和第二镜片201的结构区的表面均为平整面。第一镜片101和第二镜片201成形的工艺难度较低，有助于节省成本，提高生产效率。
进一步地，在一个实施例中，所述第一底面1013和所述第二顶面2013均为平坦面。所述第二镜筒202的内侧具有台阶状承靠面2022，并且所述第二顶面2013的至少一部分承靠于所述台阶状承靠面2022。本实施例中，第二镜头部件200的制作工艺成熟，可降低第二镜筒202与第二镜片201的组装公差，进而提升成像品质，提升良率。
在一个实施例中，所述第二胶材302接触所述第二镜筒202。所述第二胶材302可以为黑色。黑色的第二胶材302有助于遮挡杂散光从第二结构区2012进入光学系统。
在另一个实施例中，所述第二胶材302不接触所述第二镜筒202。本实施例中，第一镜片101和第二镜片201直接由第二胶材302固定和支撑，可抑制二次变异造成的成像品质的劣化。例如，可以抑制因第一镜筒102与第一镜片101结合不稳所导致的二次变异，还可以防止因镜筒变异(例如第一、第二镜筒受热或受潮后发生变异)而导致第一镜片101的位置或面型发生变异。
图4A示出了本申请又一个实施例的光学镜头的纵剖面示意图。图4B示出了图4A所示实施例中的顶端第一镜片101。参考图4A和图4B，本实施例中，所述顶部第二镜片201的第二结构区2012包括承靠区2014和粘结区2015，其中所述承靠区的侧面和顶面承靠于所述台阶状承靠面2022，且所述粘结区布置所述第二胶材302。
进一步地，图5A示出了本申请再一个实施例的光学镜头的纵剖 面示意图。图5B示出了图5A所示实施例中的顶端第一镜片101。参考图5A和图5B，本实施例中，所述第二顶面2013可以具有溢胶槽2019，所述溢胶槽2019位于所述第二顶面2013的靠近所述第二光学区2011的一端，所述第二胶材302可以为黑色。本实施例可以防止第二胶材302污染光学区，避免所拍摄图像出现污点导致的不良，从而提高光学镜头或摄像模组制作的良率。
进一步地，在一个实施例中，所述第一镜头部件100位于所述光学镜头前端，且所述第二镜头部件200位于所述光学镜头后端。
进一步地，在一个实施例中，所述的第一镜片中具有一个位于最底端的一个底部第一镜片，所述的第二镜片中具有位于最上方的一个顶部第二镜片。其中所述底部第一镜片的出光面和所述顶部第二镜片的入光面中的至少一个不为凸面。即当底部第一镜片的出光面为凸面时，顶部第二镜片的入光面为凹面或者平面；当顶部第二镜片的入光面为凸面时，底部第一镜片的出光面为凹面或者平面。以上设计是为了避免底部第一镜片的出光面和顶部第二镜片的入光面同时为凸面，导致所述第一底面1013难以下沉至第二镜筒的通光孔内。需注意，所述底部第一镜片的出光面和所述顶部第二镜片的入光面也可以均为凹面，或者均为平面，或者一个为平面另一个为凹面，这些设计均可以便于使所述第一底面1013下沉至第二镜筒的通光孔内。图9示出了本申请一个实施例中的光学镜头。如图9所示，其底部第一镜片的出光面为凹面，顶部第二镜片的入光面为凸面。另外，该图中示出了粘合第一镜片与第一镜筒的粘合胶1019。
另外，需注意，本文中所述的第一底面(底部第一镜片的第一结构区的底面)低于所述第二镜筒的顶面是指第一底面整体低于所述第二镜筒的顶面。
进一步地，本申请的一些实施例中，还提供了摄像模组。所述摄像模组可以包括前文中任意一个实施例中的光学镜头。摄像模组可以包括光学镜头和感光组件。光学镜头安装和固定于感光组件。其中，感光组件中具有感光芯片。摄像模组可以是定焦模组，也可以是自动对焦模组等其它类型的模组。图8示出了本申请一个实施例中的自动 对焦模组，其中第二镜头部件还包括马达209(或其它光学致动器)。第二镜筒202被安装于马达载体内侧，马达的基座安装于感光组件的镜座409的顶面。
进一步地，根据本申请的一个实施例，还提供了一种光学镜头组装方法，包括步骤S10至S30。
步骤S10，对第一镜头部件100和第二镜头部件200进行预定位。所述第一镜头部件100包括第一镜筒102和安装于所述第一镜筒102的至少一个第一镜片101，所述第一镜片101包括用于成像的第一光学区1011和所述第一光学区1011以外的第一结构区1012，并且所述至少一个第一镜片101中具有位于最下方的一个底部第一镜片101，所述第二镜头部件200包括第二镜筒202和安装于所述第二镜筒202的至少一个第二镜片201。所述第二镜筒202的内侧可以具有台阶状承靠面2022，并且所述第二顶面2013的至少一部分承靠于所述台阶状承靠面2022。所述预定位使所述至少一个第一镜片101和所述至少一个第二镜片201共同构成可成像的光学系统，并使所述底部第一镜片101的第一结构区1012的底面低于所述第二镜筒202的顶面。
步骤S20，基于所述光学系统的实测成像结果对所述第一镜头部件100和所述第二镜头部件200的相对位置进行主动校准。
步骤S30，用连接胶材粘合所述第一镜头部件100与所述第二镜头部件200，以使所述第一镜头部件100与所述第二镜头部件200保持在主动校准所确定的相对位置。
进一步地，在一个实施例中，步骤S40包括：在所述第二镜头部件200的顶面布置所述连接胶材；将所述第一镜头部件100和所述第二镜头部件200移动至主动校准所确定的相对位置；以及使所述连接胶材固化。可以先执行所述主动校准的步骤，再执行布置所述连接胶材的步骤。也可以先执行布置所述连接胶材的步骤，再执行所述主动校准的步骤。
进一步地，在一个实施例中，步骤S40中，使所述连接胶材固化的步骤包括：将所述第一胶材301预固化使其临时支撑和固定所述第一镜头部件100与所述第二镜头部件200的相对位置；以及将所述第 二胶材永久固化使其永久支撑和固定所述第一镜头部件100与所述第二镜头部件200的相对位置。其中所述预固化可以包括对第一胶材301进行曝光处理。所述永久固化可以包括对预固化后的所述第一镜头部件100和所述第二镜头部件200的烘烤处理。
图6A～D示出了本申请一个实施例的光学镜头组装过程。图6A示出了本申请一个实施例中进行画胶的示意图。参考图6A，先分别制作第一镜头部件100和第二镜头部件200，然后在第二镜头部件200的顶面画胶。本实施例中，所述连接胶材包括第一胶材301和第二胶材305，所述第一胶材301位于所述第一镜筒102的底面和所述第二镜筒202的顶面之间，并且所述第二胶材301位于所述第二顶面2013和所述第一底面1013之间，其中所述第一底面1013是所述底部第一镜片101的第一结构区1012的底面。在步骤S40中，布置所述连接胶材的步骤包括：在第二镜筒202的顶面布置第一胶材301，以及在第二顶面2013布置第二胶材302，其中所述第二顶面2013是顶部第二镜片201的第二结构区2012的顶面，所述顶部第二镜片201是所述至少一个第二镜片201中位于最上方的一个第二镜片201，所述第二结构区2012是第二镜片201的用于光学成像的光学区以外的区域。图6B示出了本申请一个实施例中将第一镜头部件100和第二镜头部件200布置到主动校准所确定的相对位置的示意图。其中，主动校准可以在画胶之前完成并记录下对应的坐标，在画胶后根据所记录下的坐标布置第一镜头部件100和第二镜头部件200以使二者恢复主动校准所确定的相对位置。主动校准也可以在画胶之后进行，具体来说可以在画胶后进行预定位(步骤S20)和主动校准(步骤S30)，根据实测解像力来确定成像品质达标的第一镜头部件100和第二镜头部件200的相对位置。图6C示出了本申请一个实施例中的预固化的示意图。本实施例中，预固化通过曝光处理完成，其中箭头示意性地给出光照方向。需注意，预固化过程中，通过外部摄取机构(例如夹持机构)来将第一镜头部件100和第二镜头部件200维持在主动校准所确定的相对位置。预固化完成后，可以通过预固化后的第一胶材301的固定和支撑来维持在主动校准所确定的相对位置。图6D示出了本申请一 个实施例中的永久固化的示意图。本实施例中，可以通过对预固化后的半成品进行整体烘烤来实现第二胶材302的固化。第二胶材302可以是热固胶或UV热固胶。由于热固可以具有更强的粘合作用，因此可以实现永久固化，即将第一镜头部件100和第二镜头部件200永久结合。并且这种结合具有可靠性高、耐候性好等诸多优势。
进一步地，在一个实施例中，步骤S30中，所述主动校准的步骤包括：使所述第一底面1013和所述第二顶面2013之间沿着光轴方向的间距在小于80μm的范围内进行主动校准。由于第一镜片采用了下沉式设计，因此在光学设计阶段可以减小底部第一镜片和顶部第二镜片之间的设计间隙(指底部第一镜片的结构区和顶部第二镜片的结构区之间的设计间隙)。
进一步地，根据本申请的一个实施例，还提供了一种摄像模组制作方法，包括：利用前述实施例中的光学镜头制作方法制作光学镜头；以及将所述光学镜头安装于感光组件得到所述摄像模组。需注意，本实施例中，可以先制作光学镜头，然后再将光学镜头安装于感光组件；也可以是光学镜头的组装(例如第一镜头部件与第二镜头部件的粘合)和光学镜头与感光组件的组装(例如第二镜头部件与感光组件的粘合)同步完成。
进一步地，本申请中所述的主动校准可以在多个自由度上对第一镜头部件100和第二镜头部件200的相对位置进行调整。图7A示出了本申请一个实施例中的主动校准中相对位置调节方式。在该调节方式中，所述第一镜头部件100(也可以是第一镜片101)可以相对于所述第二镜头部件200沿着x、y、z方向移动(即该实施例中的相对位置调整具有三个自由度)。其中z方向为沿着光轴的方向，x，y方向为垂直于光轴的方向。x、y方向均处于一个调整平面P内，在该调整平面P内平移均可分解为x、y方向的两个分量。
图7B示出了本申请另一个实施例的主动校准中的旋转调节。在该实施例中，相对位置调整除了具有图7A的三个自由度外，还增加了旋转自由度，即r方向的调节。本实施例中，r方向的调节是在所述调整平面P内的旋转，即围绕垂直于所述调整平面P的轴线的旋转。
进一步地，图7C示出了本申请又一个实施例的主动校准中的增加了v、w方向调节的相对位置调节方式。其中，v方向代表xoz平面的旋转角，w方向代表yoz平面的旋转角，v方向和w方向的旋转角可合成一个矢量角，这个矢量角代表总的倾斜状态。也就是说，通过v方向和w方向调节，可以调节第一镜头部件100相对于第二镜头部件200的倾斜姿态(也就是所述第一镜头部件100的光轴相对于所述第二镜头部件200的光轴的倾斜)。
上述x、y、z、r、v、w六个自由度的调节均可能影响到所述光学系的成像品质(例如影响到解像力的大小)。在本申请的其它实施例中，相对位置调节方式可以是仅调节上述六个自由度中的任一项，也可以其中任两项或者更多项的组合。
进一步地，在一个实施例中，主动校准步骤中，所述移动还包括在所述调整平面上的平移，即x、y方向上的运动。
进一步地，在一个实施例中，所述主动校准还包括：根据所述光学系统的实测解像力(指根据光学系统的实际成像结果所测得的解像力)，调节并确定所述第一镜头部件100的轴线相对于所述第二镜头部件200的轴线的夹角，即w、v方向上的调节。所组装的光学镜头或摄像模组中，所述第一镜头部件100的轴线与所述第二镜头部件200的轴线之间可以具有不为零的夹角。
进一步地，在一个实施例中，所述主动校准还包括：沿着垂直于所述调整平面的方向移动所述第一镜头部件100(即z方向上的调节)，根据所述光学系统的实测解像力，确定所述第一镜头部件100与所述第二镜头部件200之间的在垂直于所述调整平面的方向上的相对位置。
进一步地，在一个实施例中，所述预定位步骤中，使所述第一镜头部件100的底面和所述第二镜头部件200的顶面之间具有间隙；以及所述粘结步骤中，所述胶材布置于所述间隙。
在一个实施例中，主动校准步骤中，可以固定第二镜头部件200，通过夹具夹持第一镜头部件100，在与夹具连接的六轴运动机构的带动下，移动第一镜头部件100，从而实现第一镜头部件100和第二镜 头部件200之间的上述六个自由度下的相对移动。其中，夹具可以承靠于或部分承靠于第一镜头部件100的侧面，从而将第一镜头部件100夹起。在一个实施例中，第一镜片的曲率可以大于第二镜片的曲率，以使第一镜头部件对位置改变的敏感度大于第二镜头部件，从而便于主动校准。例如可以减小主动校准过程中的第一镜头部件的行程，或者增强主动校准的调节能力(即增强对制造和组装环节中的各种误差进行补偿的能力，调节能力更大意味着可以对更大的误差进行补偿，从而使光学系统可以达到设计要求)。
需要注意，上述实施例中，第一镜头部件和第二镜头部件的镜片数目可以根据需要调整。例如第一镜头部件和第二镜头部件的镜片数量可以分别为二和四，也可以分别为三和三，也可以分别为四和二，也可以分别为五和一。整个光学镜头的镜片总数也可以根据需要调整，例如光学镜头的镜片总数可以是六，也可以是五或七。
还需要注意，本申请的光学镜头，镜头部件不限于两个，例如镜头部件的数目也可以是三或四等大于二的数目。当组成光学镜头的镜头部件超过两个时，可以将相邻的两个镜头部件分别视为前文所述的第一镜头部件和前文所述的第二镜头部件。
以上描述仅为本申请的较佳实施方式以及对所运用技术原理的说明。本领域技术人员应当理解，本申请中所涉及的发明范围，并不限于上述技术特征的特定组合而成的技术方案，同时也应涵盖在不脱离所述发明构思的情况下，由上述技术特征或其等同特征进行任意组合而形成的其它技术方案。例如上述特征与本申请中公开的(但不限于)具有类似功能的技术特征进行互相替换而形成的技术方案。

Claims (27)

  1. 一种光学镜头，其特征在于，包括：
    第一镜头部件，其包括第一镜筒和安装于所述第一镜筒的至少一个第一镜片，所述第一镜片包括用于成像的第一光学区和所述第一光学区以外的第一结构区，并且所述至少一个第一镜片中具有位于最下方的一个底部第一镜片；
    第二镜头部件，其包括第二镜筒和安装于所述第二镜筒的至少一个第二镜片，所述至少一个第一镜片和所述至少一个第二镜片共同构成可成像的光学系统，并且所述底部第一镜片的第一结构区的底面低于所述第二镜筒的顶面；以及
    连接胶材，其位于所述第一镜头部件与所述第二镜头部件之间，并且适于支撑所述第一镜头部件与所述第二镜头部件并固定二者之间的相对位置。
  2. 根据权利要求1所述的光学镜头，其特征在于，所述连接胶材适于支撑和固定所述第一镜头部件与所述第二镜头部件，以使二者保持在主动校准所确定的相对位置，并且所述第一镜头部件的轴线与所述第二镜头部件的轴线之间具有不为零的夹角，其中所述主动校准是根据所述光学系统的实际成像结果而对所述第一镜头部件和所述第二镜头部件所做的相对位置调整。
  3. 根据权利要求1所述的光学镜头，其特征在于，所述连接胶材包括第一胶材，其位于所述第一镜筒的底面和所述第二镜筒的顶面之间。
  4. 根据权利要求3所述的光学镜头，其特征在于，所述第二镜片包括用于成像的第二光学区和所述第二光学区以外的第二结构区，所述至少一个第二镜片中具有位于最上方的一个顶部第二镜片；以及
    所述连接胶材还包括第二胶材，其位于第一底面和第二顶面之间， 其中所述第一底面是所述底部第一镜片的第一结构区的底面，所述第二顶面是所述顶部第二镜片的第二结构区的顶面。
  5. 根据权利要求4所述的光学镜头，其特征在于，所述第一胶材适于在预固化后临时支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置，以及所述第二胶材适于在固化后永久支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置。
  6. 根据权利要求5所述的光学镜头，其特征在于，所述第一胶材为光固胶，以及所述第二胶材为热固胶。
  7. 根据权利要求5所述的光学镜头，其特征在于，所述第一胶材和所述第二胶材均为UV热固胶。
  8. 根据权利要求4所述的光学镜头，其特征在于，所述第一底面和所述第二顶面均为平坦面。
  9. 根据权利要求4所述的光学镜头，其特征在于，所述第二镜筒的内侧具有台阶状承靠面，并且所述第二顶面的至少一部分承靠于所述台阶状承靠面。
  10. 根据权利要求9所述的光学镜头，其特征在于，所述第二胶材接触所述第二镜筒。
  11. 根据权利要求1所述的光学镜头，其特征在于，所述至少一个第二镜片中具有位于最上方的一个顶部第二镜片，其中所述底部第一镜片的出光面和所述顶部第二镜片的入光面中的至少一个不为凸面。
  12. 根据权利要求9所述的光学镜头，其特征在于，所述第二胶 材不接触所述第二镜筒。
  13. 根据权利要求9所述的光学镜头，其特征在于，所述顶部第二镜片的第二结构区包括承靠区和粘结区，其中所述承靠区的侧面和顶面承靠于所述台阶状承靠面，且所述粘结区布置所述第二胶材。
  14. 根据权利要求4所述的光学镜头，其特征在于，所述第二顶面具有溢胶槽，所述溢胶槽位于所述第二顶面的靠近所述第二光学区的一端，所述第二胶材为黑色。
  15. 根据权利要求1所述的光学镜头，其特征在于，所述第一镜头部件位于所述光学镜头的前端，且所述第二镜头部件位于所述光学镜头的后端。
  16. 一种摄像模组，其特征在于，包括权利要求1-15中任意一项所述的光学镜头。
  17. 一种光学镜头组装方法，其特征在于，包括：
    对第一镜头部件和第二镜头部件进行预定位，其中所述第一镜头部件包括第一镜筒和安装于所述第一镜筒的至少一个第一镜片，所述第一镜片包括用于成像的第一光学区和所述第一光学区以外的第一结构区，并且所述至少一个第一镜片中具有位于最下方的一个底部第一镜片，所述第二镜头部件包括第二镜筒和安装于所述第二镜筒的至少一个第二镜片，所述预定位使所述至少一个第一镜片和所述至少一个第二镜片共同构成可成像的光学系统，并使所述底部第一镜片的第一结构区的底面低于所述第二镜筒的顶面；
    基于所述光学系统的实测成像结果对所述第一镜头部件和所述第二镜头部件的相对位置进行主动校准；以及
    用连接胶材粘合所述第一镜头部件与所述第二镜头部件，以使所述第一镜头部件与所述第二镜头部件保持在主动校准所确定的相对位 置。
  18. 根据权利要求17所述的光学镜头组装方法，其特征在于，所述用连接胶材粘合的步骤包括：
    在所述第二镜头部件的顶面布置所述连接胶材；
    将所述第一镜头部件和所述第二镜头部件移动至主动校准所确定的相对位置；以及
    使所述连接胶材固化。
  19. 根据权利要求18所述的光学镜头组装方法，其特征在于，先执行所述主动校准的步骤，再执行布置所述连接胶材的步骤。
  20. 根据权利要求18所述的光学镜头组装方法，其特征在于，先执行布置所述连接胶材的步骤，再执行所述主动校准的步骤。
  21. 根据权利要求18所述的光学镜头组装方法，其特征在于，所述用连接胶材粘合的步骤中，所述连接胶材包括第一胶材和第二胶材，布置所述连接胶材的步骤包括：
    在第二镜筒的顶面布置第一胶材，以及在第二顶面布置第二胶材，其中所述第二顶面是顶部第二镜片的第二结构区的顶面，所述顶部第二镜片是所述至少一个第二镜片中位于最上方的一个第二镜片，所述第二结构区是第二镜片的用于光学成像的光学区以外的区域。
  22. 根据权利要求21所述的光学镜头组装方法，其特征在于，所述用连接胶材粘合的步骤中，所述第一胶材位于所述第一镜筒的底面和所述第二镜筒的顶面之间，并且所述第二胶材位于所述第二顶面和所述第一底面之间，其中所述第一底面是所述底部第一镜片的第一结构区的底面。
  23. 根据权利要求22所述的光学镜头组装方法，其特征在于， 所述使所述连接胶材固化的步骤包括：
    将所述第一胶材预固化使其临时支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置；以及
    将所述第二胶材永久固化使其永久支撑和固定所述第一镜头部件与所述第二镜头部件的相对位置。
  24. 根据权利要求23所述的光学镜头组装方法，其特征在于，所述预固化包括对所述第一胶材进行曝光处理。
  25. 根据权利要求24所述的光学镜头组装方法，其特征在于，所述永久固化包括对预固化后的所述第一镜头部件和所述第二镜头部件的烘烤处理。
  26. 根据权利要求22所述的光学镜头组装方法，其特征在于，所述第二镜筒的内侧具有台阶状承靠面，并且所述第二顶面的至少一部分承靠于所述台阶状承靠面。
  27. 根据权利要求22所述的光学镜头组装方法，其特征在于，所述主动校准的步骤包括：使所述第一底面和所述第二顶面之间沿着光轴方向的间距在小于80μm范围内进行主动校准。
PCT/CN2019/088814 2018-05-29 2019-05-28 光学镜头、摄像模组及其组装方法 Ceased WO2019228348A1 (zh)

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