WO2021088454A1 - 双镜筒镜头、镜头模组及组装方法 - Google Patents

双镜筒镜头、镜头模组及组装方法 Download PDF

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Publication number
WO2021088454A1
WO2021088454A1 PCT/CN2020/109675 CN2020109675W WO2021088454A1 WO 2021088454 A1 WO2021088454 A1 WO 2021088454A1 CN 2020109675 W CN2020109675 W CN 2020109675W WO 2021088454 A1 WO2021088454 A1 WO 2021088454A1
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WIPO (PCT)
Prior art keywords
lens
lens barrel
barrel
image sensor
end surface
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Application number
PCT/CN2020/109675
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English (en)
French (fr)
Inventor
邓彬全
熊鑫煜
Original Assignee
江西联益光学有限公司
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.)
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Application filed by 江西联益光学有限公司 filed Critical 江西联益光学有限公司
Priority to EP20848931.0A priority Critical patent/EP3865924B1/en
Priority to US17/138,954 priority patent/US11711601B2/en
Publication of WO2021088454A1 publication Critical patent/WO2021088454A1/zh

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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
    • 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
    • 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
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Definitions

  • This application relates to the field of optical systems, and in particular to a dual-tube lens, a lens module and an assembly method.
  • lens imaging technology lenses are more and more used in vehicle monitoring, panoramic camera, extreme sports and other fields.
  • the production yield of lenses in these fields is generally low.
  • One of the factors is the processing of various parts of the lens module. And the assembly accuracy is not up to the requirements.
  • Existing lens modules usually include a lens barrel and optical components contained in the lens barrel, and the lens is usually an integrated structure, because the lens must be combined with the image sensor component on the PCB (Printed Circuit Board) after it leaves the factory. So how to ensure that the focal position of the lens is highly coincident with the center position of the image sensor has always been the research direction of relevant technicians.
  • PCB Print Circuit Board
  • the purpose of the embodiments of the present application is to provide a dual-tube lens, a lens module, and an assembly method to solve the above-mentioned problems.
  • an embodiment of the present application provides a dual-tube lens, including a first lens tube and a second lens tube.
  • the first lens barrel includes a first end close to the object side, a second end close to the image side, and a lens group arranged in the first lens barrel.
  • the outer surface of the second end is provided with an external thread.
  • the second lens barrel includes a first end surface close to the object side, a second end surface close to the image side, and an inner surface connecting the first end surface and the second end surface. The external thread connection of the lens barrel.
  • an embodiment of the present application provides a lens module including a first lens barrel, a second lens barrel, and an image sensor assembly.
  • the first lens barrel includes a first end close to the object side, a second end close to the image side, and a lens group arranged in the first lens barrel.
  • the outer surface of the second end is provided with an external thread.
  • the second lens barrel includes a first end surface close to the object side, a second end surface close to the image side, and an inner surface connecting the first end surface and the second end surface.
  • the image sensor assembly includes a substrate, an image sensor electrically connected to the substrate, and an adhesive layer. The substrate is bonded to the second end surface of the second lens barrel through the adhesive layer.
  • an embodiment of the present application provides a method for assembling a double barrel lens, including: providing a first barrel, a second barrel, and an image sensor assembly.
  • the image sensor assembly includes a substrate and an image sensor on one side of the substrate; Connect the second lens barrel with the outer thread of the first lens barrel through internal threads; set the standard plate on the side of the substrate close to the image sensor, and set the second end surface of the second lens barrel on the side of the standard plate away from the substrate,
  • the distance along the axis of the double-barrel lens adjust the threaded connection position between the first barrel and the second barrel so that the focal point of the lens group coincides with the center of the image sensor to form a double-barrel lens.
  • an embodiment of the present application provides a method for assembling a lens module, including: providing a first lens barrel, a second lens barrel, and an image sensor assembly; Threaded connection; set the standard board on the side of the substrate close to the image sensor, and set the second end surface of the second lens barrel on the side of the standard board away from the substrate.
  • the thickness of the image sensor in the axial direction of the double lens barrel is h
  • the threaded connection position between the barrel and the second lens barrel makes the focal point of the lens group coincide with the center of the image sensor to form a double-tube lens; the double-tube lens is arranged on the side of the image sensor assembly close to the image sensor, And an adhesive layer is coated between the double-tube lens and the substrate of the image sensor assembly, the thickness of the adhesive layer is ⁇ ; the double-tube lens and the image sensor assembly are fixed.
  • the embodiments of the present application provide a dual-tube lens, a lens module, and an assembly method.
  • the thread between the first lens tube and the second lens tube By adjusting the thread between the first lens tube and the second lens tube, the focus of the lens and the center of the image sensor are realized.
  • the lens has the minimum EFL tolerance.
  • the dual-tube lens provided by the embodiments of the application has a simple structure and a small EFL tolerance.
  • FIG. 1 is a schematic diagram of the structure of a dual-tube lens provided in an embodiment of the application
  • FIG. 2 is a cross-sectional view of a first lens barrel of a dual lens barrel lens provided in an embodiment of the application;
  • FIG. 3 is a schematic structural diagram of a second lens barrel of a dual lens barrel lens provided in an embodiment of the application;
  • FIG. 4 is a cross-sectional view of a dual-tube lens provided in an embodiment of the application.
  • FIG. 5 is a schematic structural diagram of a fastener for a dual-tube lens provided in an embodiment of the application
  • FIG. 6 is a cross-sectional view of a second lens barrel of a double lens barrel lens provided in an embodiment of the application;
  • FIG. 7 is a cross-sectional view of a lens module provided in an embodiment of the application.
  • FIG. 8 is an assembly flow chart of a dual-tube lens provided in an embodiment of the application.
  • FIG. 9 is an assembly structure diagram of a dual-tube lens provided in an embodiment of the application.
  • FIG. 10 is an assembly flowchart of a lens module provided in an embodiment of the application.
  • FIG. 11 is an assembly structure diagram of a lens module provided in an embodiment of the application.
  • the existing lens module usually includes a lens barrel and an optical element contained in the lens barrel, because the lens has an integrated lens barrel structure.
  • the inventor discovered through research that there are many deficiencies in the prior art, such as: the height direction of the lens body has manufacturing tolerances, the lens assembly between the optical elements has cumulative tolerances, the lens mount connecting the lens and the image sensor assembly has manufacturing tolerances, image sensors Components have patch tolerances, etc.
  • the tolerances will be superimposed and magnified. At present, the tolerance of this superposition has reached more than 0.3-0.5mm, which has a great impact on the imaging of the lens module.
  • the inventor found that if the EFL (Effective Focal Length) tolerance value of the lens can be controlled, then when the lens is combined with the image sensor assembly, the focus of the lens and the image sensor can be accurately and quickly achieved. The center coincides, thereby improving the product yield and assembly efficiency. Therefore, the dual-tube lens, the lens module, and the assembly method in the embodiments of the present application are proposed.
  • FIG. 1 is a schematic structural diagram of a dual-tube lens 10 provided in an embodiment of the application.
  • the double barrel lens 10 includes a first barrel 110 and a second barrel 120.
  • the first lens barrel 110 and the second lens barrel 120 are assembled together to form a lens, and the first lens barrel 110 is closer to the object side than the second lens barrel 120.
  • both the first lens barrel 110 and the second lens barrel 120 can be understood as a single lens barrel, or can be understood as a combination of several lens barrels as a whole.
  • FIG. 2 is a cross-sectional view of the first lens barrel 110 of the dual lens barrel lens 10 provided in an embodiment of the present application.
  • the first lens barrel 110 may be a hollow straight tube and includes a first end 111 close to the object side. , The second end 112 near the image side and the lens group 113 arranged in the first lens barrel 110.
  • the first end 111 of the first lens barrel 110 can be used to cooperate with other lens barrels or with other optical components (for example, an optical film, a lens cover, etc.).
  • the light emitted or reflected by the object to be photographed enters the interior of the first lens barrel 110 through the first end 111.
  • a lens group 113 is provided inside the first lens barrel 110.
  • the lens group 113 may include multiple groups of lenses.
  • the outer periphery of the lens group 113 is wrapped by the first lens barrel 110 to form an assembly of the multiple groups of lenses.
  • the lens may be a spherical lens or an aspheric lens. The specific number and combination of lenses are not limited in this application.
  • the second end 112 of the first lens barrel 110 is used for mating with the second lens barrel 120.
  • the outer surface 1120 of the second end 112 is provided with an external thread 1121 for threaded engagement with the inner surface 123 of the second lens barrel 120.
  • FIG. 3 is a schematic structural diagram of the second lens barrel 120 of the dual-tube lens 10 provided in an embodiment of the application.
  • the second lens barrel 120 includes a first end surface 121 close to the object side and a first end surface 121 close to the image side.
  • the two end surfaces 122 and the inner surface 123 connecting the first end surface 121 and the second end surface 122 are provided with internal threads 124 on the inner surface 123.
  • the internal thread 124 of the second lens barrel 120 is threadedly connected with the external thread 1121 of the first lens barrel 110, that is, the first lens barrel 110 and the second lens barrel 120 can be assembled during the assembly process.
  • the relative rotation is achieved by threads, thereby changing the positional relationship between the first lens barrel 110 and the second lens barrel 120, and then the positional relationship between the lens group 113 in the first lens barrel 110 and the image sensor assembly 200.
  • the external thread 1121 of the first lens barrel 110 and the internal thread 124 of the second lens barrel 120 may be a clearance fit.
  • FIG. 4 shows a cross-sectional view of a dual-barrel lens 10 provided by an embodiment of the application.
  • the focal length of the lens group 113 in the first lens barrel 110 is marked as f
  • the optical center O of the lens group 113 and the second lens group 113 are marked as f.
  • the distance of the second end surface 122 of the lens barrel 120 is marked as H.
  • the correction coefficient ⁇ is used to correct the distance between the second end surface 122 and the image sensor assembly 200 so that the focal point of the lens group 113 coincides with the center of the image sensor 220. It should be noted that the center of the image sensor 220 refers to the center of the image sensor 220 close to the side surface of the dual-tube lens 10.
  • the lens By adjusting the thread between the first lens barrel 110 and the second lens barrel 120, the focal point of the lens coincides with the center of the image sensor 220. Then, after the first lens barrel 110 and the second lens barrel 120 are fixed, the lens has the minimum EFL tolerance.
  • the structural parameters of the image sensor assembly 200 such as the distance from the center of the image sensor 220 to the surface of the substrate 210) are known, the focal length of the lens group 113 and the distance from the center of the image sensor 220 to the surface of the substrate 210 can be used.
  • the first lens barrel 110 may further include a stop ring 114.
  • the limiting ring 114 is disposed on the outer surface 1120 of the second end 112 of the first lens barrel 110 adjacent to the external thread 1121, and the limiting ring 114 is closer to the object side relative to the external thread 1121.
  • the stop ring 114 protrudes more outward relative to the external thread 1121, that is, the outer diameter of the stop ring 114 is greater than the maximum outer diameter of the external thread 1121, and the assembly Later, the limiting ring 114 can abut against the inner wall of the second lens barrel 120 to better play a limiting role.
  • the double barrel lens 10 further includes a fastener 115.
  • An annular groove 116 is formed between the limit ring 114 and the external thread 1121 (as shown in FIG. 2).
  • the fastener 115 may be disposed in the annular groove 116.
  • FIG. 5 is a structural schematic diagram of the fastener 115 in the dual-lens tube lens 10 provided in the embodiment of the present application.
  • the fastener 115 may be an elastic washer or a wave washer. It is understandable that in the process of selecting materials, materials with light weight, moderate price and good elastic strain capacity can be selected, such as rubber.
  • FIG. 6 shows a cross-sectional view of the second lens barrel 120 of the dual lens barrel lens 10 provided in the embodiment of the present application.
  • the second lens barrel 120 further includes a bearing platform 125, which is disposed on the second lens barrel.
  • the inner side of the lens barrel 120 is adjacent to the internal thread 124, and the carrying platform 125 is closer to the object side than the internal thread 124.
  • the bearing platform 125 includes a side surface 1250 connected to the first end surface 121 and a bearing surface 1251 connected between the side surface 1250 and the inner surface 123.
  • the side surface 1250 and the bearing surface 1251 form an accommodating space 1252, and the accommodating space 1252 is used for accommodating the limiting ring 114 and the fastener 115.
  • first end surface 121 is also provided with a glue dispensing groove 1210 for dispensing glue.
  • glue dispensing groove 1210 may be connected with the accommodating space 1252 of the carrying platform 125 to facilitate the glue to enter the accommodating space 1252, so that the first lens barrel 110 and the second lens barrel 120 are better fixed.
  • the bonding medium between the first lens barrel 110 and the second lens barrel 120 is AA glue, UV glue, thermosetting glue, UV thermosetting glue, epoxy glue, pressure sensitive glue, Moisture-curable adhesives and light-curable adhesives may be one or a combination of the above.
  • the second lens barrel 120 is used to assemble the first lens barrel 110, and an adhesive medium is used to fix the first lens barrel 110 and the second lens barrel 120 during assembly.
  • the inner surface 123 of the second lens barrel 120 is provided with an internal thread 124 and a bearing platform 125.
  • a lens barrel 110 is screwed into the second lens barrel 120, the external thread 1121 ensures the stability of the first lens barrel 110 under the constraint of the internal thread 124, and the lower surface of the stop ring 114 abuts against the carrying platform 125 by the fastener 115 On the upper surface of the upper surface, the fastener 115 is wrapped in the annular groove 116, and the fastener 115 has elasticity, which ensures the stability of the assembly between the first lens barrel 110 and the second lens barrel 120.
  • the optical center O of the lens group 113 and the second lens barrel 120 can be adjusted.
  • the correction coefficient ⁇ is used to correct the distance between the second end surface 122 and the image sensor assembly 200 so that the focal point of the lens group 113 coincides with the center of the image sensor 220 in the image sensor assembly 200.
  • the double-barrel lens 10 provided by the embodiment of the present application realizes that the focal point of the double-barrel lens 10 coincides with the center of the image sensor 220 in the image sensor assembly 200 by adjusting the thread between the first lens barrel 110 and the second lens barrel 120 , And then fix the first lens barrel 110 and the second lens barrel 120 with glue. At this time, the lens has the minimum EFL tolerance.
  • the dual-tube lens 10 provided by the embodiment of the present application has a simple structure and a small EFL tolerance.
  • the focus of the dual-tube lens 10 and the center of the image sensor 220 can be accurately and quickly realized The overlap, thereby effectively improving the yield of the product matched with the image sensor assembly 200, and improving the production efficiency.
  • FIG. 7 shows a cross-sectional view of the lens module 20 provided in an embodiment of the present application.
  • the embodiment of the present application also provides a lens module 20, including a first lens barrel 110, a second lens barrel 120, and an image Sensor assembly 200.
  • the structures of the first lens barrel 110 and the second lens barrel 120 in the embodiment of the present application are the same as those in the foregoing embodiment, and will not be repeated here.
  • the image sensor assembly 200 in the embodiment of the present application may include a substrate 210, an image sensor 220 electrically connected to the substrate 210, and an adhesive layer 230.
  • the substrate 210 is bonded to the second end surface of the second lens barrel 120 through the adhesive layer 230 122.
  • the correction coefficient ⁇ is the distance between the center C of the image sensor 220 and the adhesive layer 230 along the optical axis direction of the lens group 113.
  • the center C of the image sensor 220 is the center C on the side of the image sensor 220 away from the substrate 210. Since the correction coefficient ⁇ can be used to correct the distance between the second end surface 122 and the image sensor assembly 200, the focus of the lens can be accurately and quickly achieved.
  • the center C of the image sensor 220 coincides, thereby effectively improving the yield of the product matched with the image sensor assembly 200 and improving the production efficiency.
  • the embodiment of the present application also provides a method for assembling the double-barrel lens 10, please refer to FIG. 8, which shows the assembling flowchart of the double-barrel lens 10 provided in the embodiment of the present application, and the details are as follows:
  • S110 Provide the first lens barrel 110, the second lens barrel 120 and the image sensor assembly 200.
  • the structures of the first lens barrel 110 and the second lens barrel 120 are the same as those shown in FIG. 4. For details, reference may be made to the description of the corresponding embodiment, which will not be repeated here.
  • the image sensor assembly 200 includes a substrate 210 and an image sensor 220 on one side of the substrate 210. Please refer to FIG. 7.
  • a lens group 113 is installed in the first lens barrel 110, and the second lens barrel 120 is threadedly connected with the first lens barrel 110.
  • the fastener 115 is sleeved in the annular groove 116 of the first lens barrel 110, the first lens barrel 110 is pre-installed into the second lens barrel 120, and the second lens barrel 120 is connected to the second lens barrel 120 through the internal thread 124.
  • the external thread 1121 of a lens barrel 110 is connected, and the fastener 115 abuts on the bearing surface 1251 of the second lens barrel 120, as shown in FIG. 4.
  • S130 Provide a standard plate 240 with a thickness of ⁇ , set the standard plate 240 on the side of the substrate 210 close to the image sensor 220, and set the second end surface 122 of the second lens barrel 120 on the side of the standard plate 240 away from the substrate 210, Therefore, a gap of ⁇ is reserved between the second end surface 122 of the second lens barrel 120 and the substrate 210 of the image sensor assembly 200.
  • FIG. 9 shows the assembly structure diagram of the dual-tube lens 10 provided in the embodiment of the application.
  • the correction coefficient ⁇ is the distance between the center C of the image sensor 220 and the side of the standard plate 240 away from the substrate 210 along the axis of the dual-tube lens 10, and the center C of the image sensor 220 refers to the side of the image sensor 220 away from the substrate 210. center.
  • ⁇ is greater than or equal to 100um and less than or equal to 500um.
  • the image sensor assembly 200 is placed on a horizontal working surface with one end of the image sensor 220 facing upwards.
  • the standard board 240 is closely attached to the top of the image sensor assembly 200, that is, the standard board 240 is attached to the side of the substrate 210 close to the image sensor 220.
  • the standard plate 240 may be a ring-shaped thin plate structure, and the standard plate 240 is sleeved on the outer periphery of the image sensor 220 and attached to the substrate 210 at the same time.
  • S140 Adjust the screw connection position between the first lens barrel 110 and the second lens barrel 120 so that the focal point of the lens group 113 in the first lens barrel 110 coincides with the center C of the image sensor 220 to form a double barrel lens 10 .
  • the purpose of overlapping the focal point of the lens group 113 with the center C of the image sensor 220 is achieved.
  • adjusting the threaded connection position between the first lens barrel 110 and the second lens barrel 120 refers to rotating the first lens barrel 110 relative to the second lens barrel 120.
  • the distance from the optical center O of the lens group 113 in the first lens barrel 110 to the center C of the image sensor 220 is adjusted by changing the screw connection position of the first lens barrel 110 relative to the second lens barrel 120, and the distance is made equal to the lens.
  • the focal length of group 113 is f. In this way, the double-barrel lens 10 achieves the best imaging distance and has the best imaging effect.
  • the first lens barrel 110 and the second lens barrel 120 form the double-barrel lens 10.
  • the embodiment of the present application also provides an assembling method of the lens module 20. Please refer to FIG. 10, which shows an assembling flowchart of the lens module 20 provided in the embodiment of the present application. The details are as follows:
  • S210 Provide the first lens barrel 110, the second lens barrel 120 and the image sensor assembly 200.
  • the structures of the first lens barrel 110 and the second lens barrel 120 are the same as those shown in FIG. 4. For details, reference may be made to the description of the corresponding embodiment, which will not be repeated here.
  • the structure of the image sensor assembly 200 is the same as the structure shown in FIG. 7. For details, reference may be made to the description of the corresponding embodiment, which will not be repeated here.
  • S220 Connect the second lens barrel 120 with the outer thread 1121 of the first lens barrel 110 through the inner thread 124.
  • connection of the second lens barrel 120 and the first lens barrel 110 please refer to the above-mentioned method of assembling the double-tube lens 10, and for details, please refer to the description of the corresponding embodiment, which will not be repeated here.
  • S230 Provide a standard board 240.
  • the standard board 240 is arranged on the side of the substrate 210 in the image sensor assembly 200 close to the image sensor 220, and the second end surface 122 of the second lens barrel 120 is arranged on a side of the standard board 240 away from the substrate 210. side.
  • the correction coefficient ⁇ is the distance between the center C of the image sensor 220 and the side of the standard plate 240 away from the substrate 210 along the axis of the dual-tube lens 10. It is worth noting that the center C of the image sensor 220 refers to the distance from the image sensor 220. The center of one side of the substrate 210.
  • the thickness of the standard plate 240 is ⁇ , which is greater than or equal to 100 um and less than or equal to 500 um.
  • the standard plate 240 can be a ring-shaped sheet type structure. During installation, the standard plate 240 is sleeved on the outer periphery of the image sensor 220 and attached to the substrate 210 at the same time.
  • the upper surface of the standard plate 240 is a flat horizontal surface, which is beneficial for adjusting the focal point of the lens group 113 to coincide with the center C of the image sensor 220.
  • the formed double-barrel lens 10 can be used as a finished lens or a semi-finished product.
  • the double-barrel lens 10 can be assembled with the image sensor assembly 200 to form a lens module 20, or it can be assembled with other image sensor components to form a lens module.
  • the double-barrel lens 10 and the image sensor assembly 200 are assembled, the double-barrel lens 10 and the standard plate 240 are removed from above the image sensor assembly 200 first.
  • the double-tube lens 10 When the double-tube lens 10 is assembled with other image sensor components, the double-tube lens 10 is directly arranged above the image sensor component.
  • the following steps describe the assembly process by taking the assembly of the dual-tube lens 10 and the image sensor assembly 200 as an example. Please also refer to FIG. 11, which shows an assembly structure diagram of the lens module 20 provided in an embodiment of the application.
  • the double-barrel lens 10 is arranged on the side of the image sensor assembly 200 close to the image sensor 220, and an adhesive layer 230 is coated between the double-barrel lens 10 and the substrate 210 of the image sensor assembly 200 to make it sticky.
  • the thickness of the junction layer 230 is ⁇ .
  • the material of the adhesive layer 230 can be AA glue, UV glue, thermosetting glue, UV thermosetting glue, epoxy resin glue, pressure sensitive glue, moisture curing glue, or light curing glue, or one or more of the above. Kind of combination.
  • the adhesive layer 230 is coated between the double barrel lens 10 and the substrate 210 of the image sensor assembly 200.
  • the adhesive layer 230 may be coated on the surface of the substrate 210, or on the second end surface of the double barrel lens 10. 122 Coating adhesive layer 230. Wherein, when coating the adhesive layer 230, try to ensure that the thickness of the adhesive layer 230 is uniform, so as to minimize the EFL tolerance.
  • S260 Adjust the double-barrel lens 10 again so that the focal point of the double-barrel lens 10 coincides with the center C of the image sensor 220.
  • adjusting the double-barrel lens 10 includes AA focusing, and the AA is used for focusing to make the surrounding image of the double-barrel lens 10 clear and consistent.
  • fixing the dual-tube lens 10 and the image sensor assembly 200 may include: baking and fixing the adhesive layer 230; testing the MTF (Modulation Transfer Function) value of the dual-tube lens 10; if the MTF If the value meets the preset value, the glue is dispensed in the dispensing groove 1210 between the first barrel 110 and the second barrel 120 of the dual-tube lens 10, and baked and cured; if the MTF value does not meet the preset value, Then, the second focusing is performed, that is, the first lens barrel 110 is rotated relative to the second lens barrel 120, and the focus of the lens group 113 coincides with the center C of the image sensor 220 by refocusing. After the second focusing is completed, the MTF test is performed again until the MTF value meets the preset value, and then the glue is dispensed in the glue tank 1210 and baked and cured.
  • MTF Modulation Transfer Function
  • the double-barrel lens 10 and the lens module 20 provided by the embodiments of the present application adopt the above-mentioned assembly method, which can not only accurately and quickly realize the coincidence of the focal point of the lens with the center C of the image sensor 220, but also enable the double-barrel lens 10 to overlap with the center C of the image sensor 220.
  • the EFL tolerance is reduced to a minimum, thereby effectively improving the yield of product assembly and improving production efficiency.

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Abstract

一种双镜筒镜头（10）、镜头模组（20）及组装方法。双镜筒镜头（10）包括第一镜筒（110）以及第二镜筒（120）。第一镜筒（110）包括第一端部（111）、第二端部（112）以及设置于第一镜筒（110）内的透镜组（113），第二端部（112）的外表面（1120）设有外螺纹（1121）。第二镜筒（120）包括第一端面（121）、第二端面（122）以及内表面（123），内表面（123）设有内螺纹（124），第二镜筒（120）通过内螺纹（124）与第一镜筒（110）的外螺纹（1121）连接。透镜组（113）的光心（O）与第二镜筒（120）的第二端面（122）的距离H、透镜组（113）的焦距f以及修正系数α满足关系式：H＝f+α，修正系数α用于修正第二端面（122）与影像传感器组件（200）之间的距离，使得透镜组（113）的焦点f与影像传感器（220）的中心重合。双镜筒镜头（10）结构简单，EFL公差较小，可以精准快速的实现镜头的焦点f与影像传感器（220）的中心重合，从而提高与影像传感器组件（200）组合后的产品的良率。

Description

双镜筒镜头、镜头模组及组装方法
相关申请的交叉引用
本申请要求于2019年11月07日提交中国专利局的申请号为201911082815.8、名称为“双镜筒镜头以及镜头模组”的中国专利申请的优先权，和于2020年04月29日提交的中国专利局的申请号为202010356083.3、名称为“双镜筒镜头、镜头模组及组装方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及光学系统领域，尤其涉及一种双镜筒镜头、镜头模组及组装方法。
背景技术
随着镜头成像技术的发展，镜头被越来越多的应用在车载监控、全景摄像、极限运动等领域，这些领域的镜头生产良率普遍较低，其中一个因素就是镜头模组各部件的加工与组装精度达不到要求。
现有的镜头模组通常包括镜筒及收容于镜筒中的光学元件，且镜头通常为一体式结构，由于镜头出厂后要与PCB(Printed Circuit Board，印制电路板)上的影像传感器组件组合起来，那么如何保证镜头的焦点位置与影像传感器的中心位置高度重合，一直以来是相关技术人员研究的方向。
发明内容
本申请实施例的目的是提供一种双镜筒镜头、镜头模组及组装方法，以解决上述问题。
第一方面，本申请实施例提供一种双镜筒镜头，包括第一镜筒和第二 镜筒。第一镜筒包括靠近物侧的第一端部、靠近像侧的第二端部以及设置于第一镜筒内的透镜组，第二端部的外表面设有外螺纹。第二镜筒包括靠近物侧的第一端面、靠近像侧的第二端面以及连接第一端面和第二端面的内表面，内表面设有内螺纹，第二镜筒通过内螺纹与第一镜筒的外螺纹连接。透镜组的光心与第二镜筒的第二端面的距离H、透镜组的焦距f以及修正系数α满足关系式：H＝f+α，修正系数用于修正第二端面与影像传感器组件之间的距离，使得透镜组的焦点与影像传感器的中心重合。
第二方面，本申请实施例提供一种镜头模组，包括第一镜筒、第二镜筒以及影像传感器组件。第一镜筒包括靠近物侧的第一端部、靠近像侧的第二端部以及设置于第一镜筒内的透镜组，第二端部的外表面设有外螺纹。第二镜筒包括靠近物侧的第一端面、靠近像侧的第二端面以及连接第一端面和第二端面的内表面，内表面设有内螺纹，第二镜筒通过内螺纹与第一镜筒的外螺纹连接。影像传感器组件包括基板、与基板电连接的影像传感器以及粘结层，基板通过粘结层粘结至第二镜筒的第二端面。透镜组的光心与第二镜筒的第二端面的距离H、透镜组的焦距f以及修正系数α满足关系式：H＝f+α，其中，修正系数为影像传感器的中心与粘结层沿透镜组光轴方向的距离。
第三方面，本申请实施例提供一种双镜筒镜头的组装方法，包括：提供第一镜筒、第二镜筒以及影像传感器组件，影像传感器组件包括基板和位于基板一侧的影像传感器；将第二镜筒通过内螺纹与第一镜筒的外螺纹连接；将标准板设置在基板靠近影像传感器的一侧，将第二镜筒的第二端面设置在标准板背离基板的一侧，影像传感器在双镜筒镜头的轴线方向的厚度h、标准板的厚度β以及修正系数α满足关系式：h＝β+α，其中，修正系数α为影像传感器的中心与标准板背离基板一侧沿双镜筒镜头的轴线方向的距离；调节第一镜筒与第二镜筒之间的螺纹连接位置，使透镜组的焦点与影像传感器的中心重合，以形成双镜筒镜头。
第四方面，本申请实施例提供一种镜头模组的组装方法，包括：提供第一镜筒、第二镜筒以及影像传感器组件；将第二镜筒通过内螺纹与第一镜筒的外螺纹连接；将标准板设置在基板靠近影像传感器的一侧，将第二镜筒的第二端面设置在标准板背离基板的一侧，影像传感器在双镜筒镜头的轴线方向的厚度h、标准板的厚度β以及修正系数α满足关系式：h＝β+α，其中，修正系数α为影像传感器的中心与标准板背离基板一侧沿双镜筒镜头的轴线方向的距离；调节第一镜筒与第二镜筒之间的螺纹连接位置，使透镜组的焦点与影像传感器的中心重合，以形成双镜筒镜头；将双镜筒镜头设置在影像传感器组件的靠近影像传感器的一侧，且在双镜筒镜头与影像传感器组件的基板之间涂覆粘结层，粘结层的厚度为β；将双镜筒镜头与影像传感器组件进行固定。
与现有技术相比，本申请实施例提供一种双镜筒镜头、镜头模组及组装方法，通过调节第一镜筒与第二镜筒间的螺纹，实现镜头的焦点与影像传感器的中心重合，第一镜筒与第二镜筒固定后，镜头具有EFL最小公差。本申请实施例提供的双镜筒镜头结构简单，EFL公差较小，在和与之匹配的影像传感器组件组合时，可以精准快速的实现镜头的焦点与影像传感器的中心重合，从而有效提高了与影像传感器组件搭配的产品良率，提高生产效率。
附图说明
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例中提供的一种双镜筒镜头的结构示意图；
图2为本申请实施例中提供的一种双镜筒镜头的第一镜筒的剖视图；
图3为本申请实施例中提供的一种双镜筒镜头的第二镜筒的结构示意图；
图4为本申请实施例中提供的一种双镜筒镜头的剖视图；
图5为本申请实施例中提供的一种双镜筒镜头的紧固件的结构示意图；
图6为本申请实施例中提供的一种双镜筒镜头的第二镜筒的剖视图；
图7为本申请实施例中提供的一种镜头模组的剖视图；
图8为本申请实施例中提供的一种双镜筒镜头的组装流程图；
图9为本申请实施例中提供的一种双镜筒镜头的组装结构图；
图10为本申请实施例中提供的一种镜头模组的组装流程图；
图11为本申请实施例中提供的一种镜头模组的组装结构图。
具体实施方式
为了便于理解本申请，下面将参照相关附图对本申请实施例进行更全面的描述。附图中给出了本申请的若干实施例。但是，本申请实施例可以以许多不同的形式来实现，并不限于本文所描述的实施例。相反地，提供这些实施例的目的是使对本申请实施例的公开内容更加透彻全面。
现有的镜头模组通常包括镜筒及收容于镜筒中的光学元件，由于镜头为一体式镜筒结构。发明人经研究发现现有技术中存在较多不足，例如：镜头本体的高度方向有制造公差、光学元件间的镜片组装有累计公差、连接镜头与影像传感器组件的镜座有制造公差、影像传感器组件有贴片公差等，当镜头、镜座与影像传感器组件组合后，公差会被叠加放大。目前，这种叠加的公差达到了0.3～0.5mm以上，对镜头模组的成像影响极大。
发明人研究了上述问题后，发现如果可以控制镜头的EFL(Effective Focal Length，有效焦距)公差值，那么镜头在与影像传感器组件组合时，就可以精准快速的实现镜头的焦点与影像传感器的中心重合，进而提高产品的良率和组装效率。由此，提出了本申请实施例中的双镜筒镜头、镜头模组及组装方法。
具体地，在本实施例中，请参阅图1，图1所示为本申请实施例中提供的双镜筒镜头10的结构示意图。双镜筒镜头10包括第一镜筒110以及第二镜筒 120。第一镜筒110与第二镜筒120装配在一起形成一个镜头，第一镜筒110比第二镜筒120更靠近物侧。可以理解的是，本申请实施例中，第一镜筒110和第二镜筒120都可以理解为一个单独的镜筒，也可以理解为是几个镜筒组合后的整体。
请参阅图2，所示为本申请实施例中提供的双镜筒镜头10的第一镜筒110的剖视图，第一镜筒110可以为中空直筒状，包括靠近物侧的第一端部111、靠近像侧的第二端部112以及设置在第一镜筒110内的透镜组113。
第一镜筒110的第一端部111可以用于与其他镜筒配合，或者与其他光学组件配合(例如光学膜片、镜头盖等)。被拍摄物体发出或者反射的光线经过第一端部111进入第一镜筒110内部。
请参阅图2，第一镜筒110的内部设置有透镜组113，透镜组113可以包括多组透镜，透镜组113外围被第一镜筒110包裹用于形成对多组透镜的组装。其中，透镜可以为球面透镜也可以为非球面透镜。透镜的具体数量以及组合形式本申请不做限定。被拍摄物体发出或者反射的光线经过第一端部111进入第一镜筒110内部后，由透镜组113聚焦后由第一镜筒110的第二端部112射出。
第一镜筒110的第二端部112用于与第二镜筒120配合。于本申请实施例中，第二端部112的外表面1120设置有外螺纹1121，用于与第二镜筒120的内表面123螺纹配合。
请参阅图3，所示为本申请实施例中提供的双镜筒镜头10的第二镜筒120的结构示意图，第二镜筒120包括靠近物侧的第一端面121、靠近像侧的第二端面122以及连接第一端面121和第二端面122的内表面123，内表面123上设有内螺纹124。
请参阅图2至图4，第二镜筒120的内螺纹124与第一镜筒110的外螺纹1121螺纹连接，也就是说，第一镜筒110和第二镜筒120在装配过程中可以通过螺纹实现相对旋转，从而改变第一镜筒110与第二镜筒120的位置关系，继而改变第一镜筒110内的透镜组113与影像传感器组件200之间的位置关 系。其中，第一镜筒110的外螺纹1121与第二镜筒120的内螺纹124可以为间隙配合。
请参阅图4，所示为本申请实施例提供的双镜筒镜头10的剖视图，将第一镜筒110中的透镜组113的焦距标记为f，将透镜组113的光心O与第二镜筒120的第二端面122的距离标记为H，在本申请实施例中，第一镜筒110中的透镜组113的焦距f、透镜组113的光心O与第二镜筒120的第二端面122的距离H、以及修正系数α满足关系式：H＝f+α。其中，修正系数α用于修正第二端面122与影像传感器组件200之间的距离，使得透镜组113的焦点与影像传感器220的中心重合。需要注意的是，影像传感器220的中心是指影像传感器220靠近双镜筒镜头10一侧表面的中心。
通过调节第一镜筒110与第二镜筒120间的螺纹，实现镜头的焦点与影像传感器220的中心重合，然后第一镜筒110与第二镜筒120固定后，镜头具有EFL最小公差。具体的，在已知影像传感器组件200的结构参数(例如影像传感器220的中心到基板210表面的距离)的情况下，可以根据透镜组113的焦距、影像传感器220的中心到基板210表面的距离获得修正参数α，该修正参数α可以使得透镜组113的焦点与影像传感器220的中心重合，根据关系式H＝f+α调节第一镜筒110与第二镜筒120间的螺纹并固定。
中心C请参见图2，进一步地，为了增加第一镜筒110与第二镜筒120装配时的便捷性和稳固性，第一镜筒110还可以包括限位环114。限位环114设置于第一镜筒110的第二端部112的外表面1120与外螺纹1121相邻，限位环114相对外螺纹1121更靠近物侧。
进一步地，在垂直于第一镜筒110轴线的方向上，限位环114相对外螺纹1121更向外突出，也就是说，限位环114的外径大于外螺纹1121的最大外径，装配后，限位环114可以抵靠在第二镜筒120的内壁上，更好的起到限位的作用。
请再参见图4，进一步地，双镜筒镜头10还包括紧固件115。限位环114 和外螺纹1121之间形成有环形卡槽116(如图2)。紧固件115可以设置于环形卡槽116中。具体地，在本申请实施例中，请参阅图5，所示为本申请实施例中提供的双镜筒镜头10中紧固件115的结构示意图，紧固件115可以为弹性垫圈或波浪垫圈，可以理解的，在选材过程中，可选用质量轻，价格适中，弹性应变能力好的材料，如橡胶等。
请参阅图6，所示为本申请实施例中提供的双镜筒镜头10的第二镜筒120的剖视图，进一步地，第二镜筒120还包括承载台125，承载台125设置于第二镜筒120的内侧与内螺纹124相邻，承载台125相对内螺纹124更靠近物侧。承载台125包括与第一端面121连接的侧面1250以及连接于侧面1250与内表面123之间的承载面1251。侧面1250与承载面1251形成容置空间1252，容置空间1252用于容置限位环114以及紧固件115。
进一步地，第一端面121还设置有点胶槽1210用于点胶。进一步地，点胶槽1210可以与承载台125的容置空间1252连通，以方便胶水进入容置空间1252内，使第一镜筒110和第二镜筒120更好的被固定。
进一步地，在本实施例中，第一镜筒110与第二镜筒120间的粘接介质为AA胶、UV胶、热固胶、UV热固胶、环氧树脂胶、压敏胶、湿气固化胶、光固化胶，可以是上述一种或多种的结合。
在本申请实施例中，请参阅图4，，第二镜筒120用于组装第一镜筒110，组装时配合使用粘接介质使第一镜筒110与第二镜筒120固定。为了增加第二镜筒120装配时的便捷性和稳固性，第二镜筒120的内表面123设有内螺纹124和承载台125，第一镜筒110与第二镜筒120组装时，第一镜筒110旋入第二镜筒120，外螺纹1121在内螺纹124的约束下保证第一镜筒110的稳固性，限位环114的下表面通过紧固件115抵靠到承载台125的上表面，紧固件115包裹在环形卡槽116内，紧固件115具有弹性，保证了第一镜筒110与第二镜筒120之间装配的稳固性。
具体地，在本申请实施例中，请参阅图4，通过旋转第一镜筒110与第二 镜筒120间的螺纹，可实现调节透镜组113的光心O与第二镜筒120的第二端部112的距离H，使其透镜组113的光心O与第二镜筒120的第二端面122的距离H＝透镜组113的焦距f+修正系数α。其中，修正系数α用于修正第二端面122与影像传感器组件200之间的距离，使得透镜组113的焦点与影像传感器组件200中的影像传感器220的中心重合。
本申请实施例提供的双镜筒镜头10，通过调节第一镜筒110与第二镜筒120间的螺纹，实现双镜筒镜头10的焦点与影像传感器组件200中的影像传感器220的中心重合，然后用胶水固定第一镜筒110与第二镜筒120，此时镜头具有EFL最小公差。
本申请实施例提供的双镜筒镜头10结构简单，EFL公差较小，在和与之匹配的影像传感器组件200组合时，可以精准快速的实现双镜筒镜头10的焦点与影像传感器220的中心重合，从而有效提高了与影像传感器组件200搭配的产品良率，提高生产效率。
请参阅图7，所示为本申请实施例中提供的镜头模组20的剖视图，本申请实施例还提供了一种镜头模组20，包括第一镜筒110、第二镜筒120以及影像传感器组件200。
本申请实施例中的第一镜筒110和第二镜筒120的结构与前述实施例中的相同，这里不再赘述。本申请实施例中的影像传感器组件200，可以包括基板210、与基板210电连接的影像传感器220以及粘结层230，基板210通过粘结层230粘结至第二镜筒120的第二端面122。
第一镜筒110中的透镜组113的焦距f、透镜组113的光心O与第二镜筒120的第二端面122的距离H、以及修正系数α满足关系式：H＝f+α。其中，修正系数α为影像传感器220的中心C与粘结层230沿透镜组113光轴方向的距离。影像传感器220的中心C是影像传感器220背离基板210一侧的中心C，由于修正系数α可以用于修正第二端面122与影像传感器组件200之间的距离，可以精准快速的实现镜头的焦点与影像传感器220的中心C重合，从而有 效提高了与影像传感器组件200搭配的产品良率，提高生产效率。
本申请实施例还提供了一种双镜筒镜头10的组装方法，请参阅图8，所示为本申请实施例中提供的双镜筒镜头10的组装流程图，具体如下：
S110：提供第一镜筒110、第二镜筒120以及影像传感器组件200。
其中，第一镜筒110和第二镜筒120的结构与图4所示结构相同，具体可参照对应实施例的描述，这里不再赘述。影像传感器组件200包括基板210和位于基板210一侧的影像传感器220，请参照图7。
S120：将第二镜筒120通过内螺纹124与第一镜筒110的外螺纹1121连接。
第一镜筒110内安装有透镜组113，将第二镜筒120与第一镜筒110螺纹连接。具体的，将紧固件115套在第一镜筒110的环形卡槽116内，将第一镜筒110预安装入第二镜筒120内，将第二镜筒120通过内螺纹124与第一镜筒110的外螺纹1121连接，且使得紧固件115抵接于第二镜筒120的承载面1251上，如图4所示。
S130：提供厚度为β的标准板240，将标准板240设置在基板210靠近影像传感器220的一侧，将第二镜筒120的第二端面122设置在标准板240背离基板210的一侧，使得第二镜筒120的第二端面122与影像传感器组件200的基板210之间预留有β的间距。具体的，请参阅图9，所示为本申请实施例中提供的双镜筒镜头10的组装结构图，图9中标号240为标准板，使影像传感器220的厚度h、标准板240的厚度β以及修正系数α满足关系式：h＝β+α。
其中，修正系数α为影像传感器220的中心C与标准板240背离基板210一侧沿双镜筒镜头10的轴线方向的距离，影像传感器220的中心C是指影像传感器220背离基板210一侧的中心。
可选的，β大于或者等于100um且小于或者等于500um。
影像传感器组件200放置于水平工作面上，且使得影像传感器220的一端 朝向上方设置。将标准板240紧贴在影像传感器组件200的上方，即标准板240贴合设置于基板210的靠近影像传感器220的一侧。
其中，标准板240可以为环形薄板状结构，将标准板240套设在影像传感器220的外周且同时贴设于基板210上。
S140：调节第一镜筒110与第二镜筒120之间的螺纹连接位置，使第一镜筒110内的透镜组113的焦点与影像传感器220的中心C重合，以形成双镜筒镜头10。通过调节透镜组113焦点的位置，实现透镜组113的焦点与影像传感器220的中心C重合的目的。
可选的，调节第一镜筒110与第二镜筒120之间的螺纹连接位置是指，相对于第二镜筒120，旋转第一镜筒110。通过改变第一镜筒110相对于第二镜筒120的螺纹连接位置来调节第一镜筒110中的透镜组113的光心O到影像传感器220的中心C的距离，且使得该距离等于透镜组113的焦距f。从而使得双镜筒镜头10达到最佳的成像距离，具有最佳的成像效果，调节完成后的第一镜筒110和第二镜筒120形成双镜筒镜头10。
本申请实施例还提供了一种镜头模组20的组装方法，请参照图10，所示为本申请实施例中提供的镜头模组20的组装流程图，具体如下：
S210：提供第一镜筒110、第二镜筒120以及影像传感器组件200。
其中，第一镜筒110和第二镜筒120的结构与图4所示结构相同，具体可参照对应实施例的描述，这里不再赘述。影像传感器组件200的结构与图7所示结构相同，具体可参照对应实施例的描述，这里不再赘述。
S220：将第二镜筒120通过内螺纹124与第一镜筒110的外螺纹1121连接。
其中，第二镜筒120和第一镜筒110的连接请参照上述双镜筒镜头10的组装方法，具体可参照对应实施例的描述，这里不再赘述。
S230：提供标准板240，将标准板240设置在影像传感器组件200中的基板210靠近影像传感器220的一侧，将第二镜筒120的第二端面122设置在标 准板240背离基板210的一侧。使得影像传感器220的厚度h、标准板240的厚度β以及修正系数α满足关系式：h＝β+α。
其中，修正系数α为影像传感器220的中心C与标准板240背离基板210一侧沿双镜筒镜头10的轴线方向的距离，值得注意的是，影像传感器220的中心C是指影像传感器220背离基板210的一侧的中心。
可选的，标准板240的厚度为β，β大于或者等于100um且小于或者等于500um。标准板240为可以环状薄片类结构，在安装时，将标准板240套设在影像传感器220的外周且同时贴设于基板210上。另外，标准板240的上表面为表面平整的水平面，有利于调节透镜组113的焦点与影像传感器220的中心C重合。
S240：调节第一镜筒110与第二镜筒120之间的螺纹连接位置，使透镜组113的焦点与影像传感器220的中心C重合，以形成双镜筒镜头10。
其中，调节第一镜筒110和第二镜筒120间的螺纹，请参照上述双镜筒镜头10的组装方法，具体可参照对应实施例的描述，这里不再赘述。可以理解的是，所形成的双镜筒镜头10可以作为镜头成品，也可以作为半成品。在下面步骤中双镜筒镜头10可以与影像传感器组件200组装为镜头模组20，也可以与其他的影像传感器组件组装为镜头模组。当双镜筒镜头10与影像传感器组件200进行组装时，先将双镜筒镜头10和标准板240从影像传感器组件200上方取掉。当双镜筒镜头10与其他影像传感器组件进行组装时，则直接设置双镜筒镜头10于影像传感器组件上方。下面步骤以双镜筒镜头10与影像传感器组件200进行组装为例对组装过程进行描述，请同时参照图11，所示为本申请实施例中提供的镜头模组20的组装结构图。
S250：将双镜筒镜头10设置在影像传感器组件200的靠近影像传感器220的一侧，且在双镜筒镜头10与影像传感器组件200的基板210之间涂覆粘结层230，以使粘结层230的厚度为β。
粘结层230的材料可以为AA胶、UV胶、热固胶、UV热固胶、环氧树脂 胶、压敏胶、湿气固化胶、或光固化胶，也可以是上述一种或多种的结合。
这里在双镜筒镜头10与影像传感器组件200的基板210之间涂覆粘结层230，可以是在基板210表面涂覆粘结层230，也可以是在双镜筒镜头10的第二端面122涂敷粘结层230。其中，涂覆粘结层230时，尽量保证粘结层230的厚度均匀一致，可以尽量减少EFL公差。
S260：再次调整双镜筒镜头10，以使双镜筒镜头10的焦点与影像传感器220的中心C重合。
其中，调整双镜筒镜头10包括AA调焦，通过AA调焦以使双镜筒镜头10的四周成像清晰一致。
S270：将双镜筒镜头10与影像传感器组件200进行固定。
具体的，将双镜筒镜头10与影像传感器组件200进行固定可以包括：将粘结层230进行烘烤固定；测试双镜筒镜头10的MTF(Modulation Transfer Function，调制传递函数)值；如果MTF值满足预设值，则在双镜筒镜头10的第一镜筒110和第二镜筒120之间的点胶槽1210内点胶，并烘烤固化；如果MTF值不满足预设值，则进行二次调焦，即相对于第二镜筒120，旋转第一镜筒110，通过重新调焦以使透镜组113的焦点与影像传感器220的中心C重合。二次调焦完成后再次进行MTF测试，直至MTF值满足预设值，然后在点胶槽1210内点胶，并烘烤固化。
本申请实施例提供的双镜筒镜头10和镜头模组20采用上述的组装方法，不仅可以精准、快速的实现镜头的焦点与影像传感器220的中心C重合，而且能够使双镜筒镜头10的EFL公差降低到最小，从而有效提高产品组装的良率，提高生产效率。
本文中所描述的具体实施例仅仅是对本申请实施例精神作举例说明。本申请所属技术领域的技术人员可以对所描述的具体实施例做各种各样的修改或补充或采用类似的方式替代，但并不会偏离本申请的精神或者超越所附权利要求书所定义的范围。

Claims (20)

  1. 一种双镜筒镜头，其特征在于，包括：
    第一镜筒，所述第一镜筒包括靠近物侧的第一端部、靠近像侧的第二端部以及设置于所述第一镜筒内的透镜组，所述第二端部的外表面设有外螺纹；以及
    第二镜筒，所述第二镜筒包括靠近物侧的第一端面、靠近像侧的第二端面以及连接所述第一端面和所述第二端面的内表面，所述内表面设有内螺纹，所述第二镜筒通过所述内螺纹与所述第一镜筒的外螺纹连接；
    所述透镜组的光心与所述第二镜筒的第二端面的距离H、所述透镜组的焦距f以及修正系数α满足关系式：H＝f+α，所述修正系数用于修正所述第二端面与影像传感器组件之间的距离，使得所述透镜组的焦点与所述影像传感器组件的影像传感器的中心重合。
  2. 根据权利要求1所述的双镜筒镜头，其特征在于，所述第一镜筒还包括限位环，所述限位环设置于所述第二端部的外表面与所述外螺纹相邻，所述限位环相对于所述外螺纹更靠近物侧。
  3. 根据权利要求2所述的双镜筒镜头，其特征在于，在垂直于所述第一镜筒轴线的方向上，所述限位环相对于所述外螺纹更向外突出。
  4. 根据权利要求2所述的双镜筒镜头，其特征在于，所述限位环与所述外螺纹之间形成环形卡槽，所述双镜筒镜头还包括紧固件，所述紧固件设置于所述环形卡槽内。
  5. 根据权利要求2所述的双镜筒镜头，其特征在于，所述第二镜筒还包括承载台，所述承载台设置于所述第二镜筒的内侧与所述内螺纹相邻，所述承载台相对于所述内螺纹更靠近物侧，所述承载台包括与所述第一端面连接的侧面以及连接于所述侧面与所述内表面之间的承载面，所述侧面与所述承载面形成容置空间，所述容置空间用于容置所述限位环。
  6. 根据权利要求5所述的双镜筒镜头，其特征在于，所述第一端面还设置有点胶槽，所述点胶槽与所述承载台的容置空间连通。
  7. 一种镜头模组，其特征在于，包括：
    第一镜筒，所述第一镜筒包括靠近物侧的第一端部、靠近像侧的第二端部以及设置于所述第一镜筒内的透镜组，所述第二端部的外表面设有外螺纹；
    第二镜筒，所述第二镜筒包括靠近物侧的第一端面、靠近像侧的第二端面以及连接所述第一端面和所述第二端面的内表面，所述内表面设有内螺纹，所述第二镜筒通过所述内螺纹与所述第一镜筒的外螺纹连接；以及
    影像传感器组件，所述影像传感器组件包括基板、与所述基板电连接的影像传感器以及粘结层，所述基板通过所述粘结层粘结至所述第二镜筒的第二端面；
    所述透镜组的光心与所述第二镜筒的第二端面的距离H、所述透镜组的焦距f以及修正系数α满足关系式：H＝f+α，其中，所述修正系数为所述影像传感器的中心与所述粘结层沿所述透镜组光轴方向的距离。
  8. 根据权利要求7所述的镜头模组，其特征在于，所述粘结层的厚度为β，所述影像传感器在所述透镜组光轴方向的厚度h＝α+β。
  9. 根据权利要求7所述的镜头模组，其特征在于，所述第一镜筒还包括限位环，所述限位环设置于所述第二端部的外表面与所述外螺纹相邻，所述限位环相对于所述外螺纹更靠近物侧。
  10. 根据权利要求9所述的镜头模组，其特征在于，在垂直于所述第一镜筒轴线的方向上，所述限位环相对于所述外螺纹更向外突出。
  11. 根据权利要求9所述的镜头模组，其特征在于，所述限位环与所述外螺纹之间形成环形卡槽，所述镜头模组还包括紧固件，所述紧固件设置于所述环形卡槽内。
  12. 根据权利要求9所述的镜头模组，其特征在于，所述第二镜筒还包 括承载台，所述承载台设置于所述第二镜筒的内侧与所述内螺纹相邻，所述承载台相对于所述内螺纹更靠近物侧，所述承载台包括与所述第一端面连接的侧面以及连接于所述侧面与所述内表面之间的承载面，所述侧面与所述承载面形成容置空间，所述容置空间用于容置所述限位环。
  13. 根据权利要求12所述的镜头模组，其特征在于，所述第一端面还设置有点胶槽，所述点胶槽与所述承载台的容置空间连通。
  14. 一种如权利要求1所述的双镜筒镜头的组装方法，其特征在于，包括：
    提供所述第一镜筒、所述第二镜筒以及影像传感器组件，所述影像传感器组件包括基板和位于所述基板一侧的影像传感器；
    将所述第二镜筒通过所述内螺纹与所述第一镜筒的所述外螺纹连接；
    将标准板设置在所述基板靠近所述影像传感器的一侧，将所述第二镜筒的所述第二端面设置在所述标准板背离所述基板的一侧，所述影像传感器在所述双镜筒镜头的轴线方向的厚度h、所述标准板的厚度β以及修正系数α满足关系式：h＝β+α，其中，所述修正系数α为所述影像传感器的中心与所述标准板背离所述基板一侧沿所述双镜筒镜头的轴线方向的距离；
    调节所述第一镜筒与所述第二镜筒之间的螺纹连接位置，使所述透镜组的焦点与所述影像传感器的中心重合，以形成双镜筒镜头。
  15. 根据权利要求14所述的组装方法，其特征在于，所述第一镜筒外表面形成环形卡槽，所述将所述第二镜筒通过所述内螺纹与所述第一镜筒的所述外螺纹连接包括：
    将紧固件套在所述第一镜筒的环形卡槽内，将所述第一镜筒预安装入所述第二镜筒内，将所述第二镜筒通过所述内螺纹与所述第一镜筒的所述外螺纹连接。
  16. 根据权利要求14所述的组装方法，其特征在于，所述标准板的厚 度β大于或者等于100um且小于或者等于500um。
  17. 一种如权利要求7所述的镜头模组的组装方法，其特征在于，包括：
    提供所述第一镜筒、所述第二镜筒以及所述影像传感器组件；
    将所述第二镜筒通过所述内螺纹与所述第一镜筒的所述外螺纹连接；
    将标准板设置在所述基板靠近所述影像传感器的一侧，将所述第二镜筒的所述第二端面设置在所述标准板背离所述基板的一侧，所述影像传感器在所述双镜筒镜头的轴线方向的厚度h、所述标准板的厚度β以及修正系数α满足关系式：h＝β+α，其中，所述修正系数α为所述影像传感器的中心与所述标准板背离所述基板一侧沿所述双镜筒镜头的轴线方向的距离；
    调节所述第一镜筒与所述第二镜筒之间的螺纹连接位置，使所述透镜组的焦点与所述影像传感器的中心重合，以形成双镜筒镜头；
    将所述双镜筒镜头设置在所述影像传感器组件的靠近所述影像传感器的一侧，且在所述双镜筒镜头与所述影像传感器组件的基板之间涂覆粘结层，所述粘结层的厚度为β；
    将所述双镜筒镜头与所述影像传感器组件进行固定。
  18. 根据权利要求17所述的组装方法，其特征在于，所述标准板的厚度β大于或者等于100um且小于或者等于500um。
  19. 根据权利要求17所述的组装方法，其特征在于，所述将所述双镜筒镜头与所述影像传感器组件进行固定之前，还包括；
    调整所述双镜筒镜头，以使所述双镜筒镜头的焦点与所述影像传感器的中心重合。
  20. 根据权利要求17所述的组装方法，其特征在于，所述将所述双镜筒镜头与所述影像传感器组件进行固定包括：
    将所述粘结层烘烤固定；
    测试所述双镜筒镜头的MTF值；
    如果所述MTF值满足预设值，则在所述双镜筒镜头的第一镜筒和第二镜筒之间的点胶槽内点胶，并烘烤固化；
    如果所述MTF值不满足预设值，相对于所述第二镜筒，旋转所述第一镜筒，以使所述透镜组的焦点与所述影像传感器的中心重合，再次进行MTF测试。
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