Lens assembly method

Abstract

The present application relates to a kind of lens assembly methods, lens includes sequentially arranged multiple presequence lenses and the terminal lens closest to image side from object side to image side along optical axis, in the lens assembly process, multiple presequence lenses and the assembly of each presequence lens corresponding accessory in lens barrel are first, then terminal lens is fixedly connected with compression ring, finally lens barrel and the fixing of water-based glue of compression ring are completed, the assembly of whole is completed.The present application can avoid the problem of difficult glue dispensing caused by narrow gap between lens and lens barrel or between compression ring and lens barrel, prevent the degradation of adhesive due to long assembly time, avoid lens loosening, increase the overall strength, and effectively prevent the situation that optical axis cannot be aligned after long-term use, effectively improve the problem that current conventional compression ring still does not have good stability after water-based glue is dispensed.

Description

Technical Field

[0001] This invention relates to the field of lens assembly technology, and more particularly to a lens assembly method. Background Technology

[0002] In current technology, with the continuous advancement of semiconductor processes, the performance of electronic image sensors has gradually improved, and pixels can reach increasingly smaller sizes. Therefore, optical lenses with high image quality are an indispensable component. However, current lens assembly mostly involves using adhesives to cure the lens barrel or adding a retaining ring and then using adhesive to cure the retaining ring and lens barrel. Because the gaps between the lens and the lens barrel, or between the retaining ring and the lens barrel, can be narrow, dispensing the adhesive is difficult, and this method requires curing, resulting in long assembly times. Furthermore, the adhesive deteriorates and loses strength over time, causing the lens to loosen and affecting the overall quality of the lens. Additionally, directly bonding the lens barrel to the overall lens results in low overall lens strength. Summary of the Invention

[0003] The purpose of this invention is to provide a lens assembly method to improve overall strength and prevent the problem of misalignment of the optical axis of the lens assembly after long-term use.

[0004] To achieve the above-mentioned objective, the present invention provides a lens assembly method, comprising:

[0005] S1. Assemble multiple preceding lenses and accessories into the lens barrel in sequence;

[0006] S2. Securely connect the end lens closest to the image side to the pressure ring;

[0007] S3. Fix the end lens and the pressure ring in the lens barrel.

[0008] In any of the above technical solutions, the pressure ring includes a mating end and a tail end that are perpendicular to each other. The mating end is used to connect and mate with the lens barrel, and the tail end is used as the support end of the lens.

[0009] In any of the above technical solutions, step S2 includes:

[0010] S21. Position the mating end of the pressure ring vertically upwards and place the tail end on the mounting platform;

[0011] S22. The end lens is installed in the pressure ring by dispensing adhesive or welding;

[0012] S23. A light-shielding plate is provided on the object side of the end lens.

[0013] In any of the above technical solutions, the lens barrel is provided with an annular groove, and in step S3, the mating end of the pressure ring is embedded in the annular groove.

[0014] In any of the above technical solutions, the pressing ring is doped with any one or more chemically stable substances among glass fiber, ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4, or carbon black particles.

[0015] In any of the above technical solutions, the lens barrel is doped with any one or more chemically stable substances among glass fiber, ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4, or carbon black particles during the forming process.

[0016] In any of the above technical solutions, in step S1, the accessory includes at least one of a light-shielding sheet and a spacer.

[0017] In any of the above technical solutions, in step S3, the lens barrel and the pressure ring are fixed by dispensing adhesive. Before the mating end of the pressure ring is embedded into the annular groove, water-soluble adhesive is applied to the annular groove and the contact portion between the lens barrel and the mating end.

[0018] According to one aspect of the present invention, the lens includes a plurality of preceding lenses arranged sequentially from the object side to the image side along the optical axis and an end lens closest to the image side. During the lens assembly process, the plurality of preceding lenses and their corresponding accessories are first assembled in the lens barrel, then the end lens is fixedly connected to the retaining ring, and finally the lens barrel and the retaining ring are fixed with hydrosol to complete the overall assembly. This avoids the problem of difficult dispensing caused by narrow gaps between the lens and the lens barrel or between the retaining ring and the lens barrel, prevents the adhesive from deteriorating and reducing its strength due to long assembly time, avoids lens loosening, increases overall strength, and effectively prevents the optical axis from becoming misaligned after long-term use. It also effectively improves the problem that conventional retaining rings still do not have good stability after hydrosol dispensing. Attached Figure Description

[0019] Figure 1 A flowchart illustrating a lens assembly method according to an embodiment of the present invention;

[0020] Figure 2 A flowchart illustrating the assembly of the pressure ring and the end lens according to one embodiment of the present invention is shown.

[0021] Figure 3 This schematic diagram illustrates the structure of a pressure ring according to one embodiment of the present invention.

[0022] Figure 4 This schematic diagram illustrates the structure of the pressure ring and end lens assembly according to one embodiment of the present invention.

[0023] Figure 5This schematic diagram illustrates the assembly structure of the pressure ring, end lens, and light shield in a lens assembly method according to an embodiment of the present invention.

[0024] Figure 6 This schematic diagram illustrates the structure of the pre-assembly lens and accessory assembly in a lens assembly method according to an embodiment of the present invention.

[0025] Figure 7 This diagram schematically illustrates the structure of a lens after assembly, according to an embodiment of the present invention.

[0026] in, Figures 1 to 7 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0027] 1. Pressure ring; 2. End lens; 3. Light shield; 4. Lens barrel; 5. Spacer; 6. Preceding lens; 11. Mating end; 12. Tail end. Detailed Implementation

[0028] The description of the embodiments in this specification should be taken in conjunction with the accompanying drawings, which should form part of the complete specification. In the drawings, the shape or thickness of the embodiments may be exaggerated and may be indicated in a simplified or convenient manner. Furthermore, parts of the various structures in the drawings will be described separately; it is worth noting that elements not shown in the figures or not described in words are in a form known to those skilled in the art.

[0029] When describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer" express orientations or positional relationships based on the orientations or positional relationships shown in the relevant drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on the present invention.

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. The embodiments cannot be described in detail here, but the embodiments of the present invention are not limited to the following embodiments.

[0031] According to one embodiment of the present invention, a lens assembly method includes:

[0032] S1. Assemble multiple preceding lenses 6 and accessories into the lens barrel 4 in sequence;

[0033] S2. Fix the end lens 2, which is closest to the image side, to the pressure ring 1;

[0034] S3. Fix the end lens 2 and the pressure ring 1 in the lens barrel 4.

[0035] In this embodiment, the lens includes a plurality of preceding lenses 6 arranged sequentially from the object side to the image side along the optical axis and an end lens 2 closest to the image side. During the lens assembly process, the plurality of preceding lenses 6 and the corresponding accessories of each preceding lens 6 are first assembled in the lens barrel 4. Then, the end lens 2 is fixedly connected to the retaining ring 1. Finally, the lens barrel 4 and the retaining ring 1 are fixed with hydrosol to complete the overall assembly. This can avoid the problem of difficult glue application caused by narrow gaps between the lens and the lens barrel 4 or between the retaining ring 1 and the lens barrel 4, prevent the adhesive from deteriorating and reducing its strength due to long assembly time, avoid lens loosening, increase the overall strength, and effectively prevent the optical axis from being misaligned after long-term use. This effectively improves the problem that the current conventional retaining ring 1 still does not have good stability after hydrosol application.

[0036] Specifically, the inner diameter of the lens barrel 4 gradually increases from the object side to the image side. When assembling the lens, the lens barrel 4 is usually placed upside down on the mounting table first, and then the corresponding front lenses 6 are installed in sequence. After the end lens 2 is fixedly connected to the retaining ring 1, the end lens 2 and the retaining ring 1 are connected to the lens barrel 4 as a whole. The shape of the image side of the end lens 2 is "M". On the one hand, its structure is more stable and easier to intercept stray light reflected by the color filter. On the other hand, it is easy to distinguish the object side and the image side of the end lens 2.

[0037] One or more end lenses 2 can be installed inside the pressure ring 1, provided that stability is guaranteed.

[0038] Furthermore, since the end lens 2 and the pressure ring 1 need to be inverted as a whole and assembled with the lens barrel 4, welding or adhesive bonding is used to fix the end lens 2 and the lens barrel 4 together. It is understandable that welding is suitable for structures with fewer parts; adhesive bonding is suitable for structures with more parts, including but not limited to spacers, spacers 5, etc.

[0039] In one embodiment of the present invention, preferably, the pressure ring 1 includes a mating end 11 and a tail end 12 that are perpendicular to each other. The mating end 11 is used to connect and engage with the lens barrel 4, and the tail end 12 is used as the support end of the lens.

[0040] In this embodiment, the pressure ring 1 is generally annular, including a mating end 11 and a tail end 12 that are perpendicular to each other. The larger tail end 12 is mainly used as the support end of the lens, which helps to enhance the overall stability. The longer mating end 11 is mainly used to connect and mate with the lens barrel 4, which helps to combine the lens barrel 4, the lens and the pressure ring 1 into a whole.

[0041] It is understandable that the cross-section of the annular pressure ring 1 at any position is L-shaped, with the tail end 12 being the horizontal part of the L-shaped cross-section and the mating end 11 being the vertical part of the L-shaped cross-section.

[0042] In one embodiment of the present invention, preferably, step S2 includes:

[0043] S21. Position the mating end 11 of the pressure ring 1 vertically upwards and place the tail end 12 on the mounting platform;

[0044] S22. Install the end lens 2 into the pressure ring 1 by dispensing adhesive or welding;

[0045] S23. A light-shielding plate 3 is provided on the object side of the end lens 2.

[0046] In this embodiment, when assembling the pressure ring 1 and the end lens 2, in order to facilitate installation, the pressure ring 1 is first inverted, with the mating end 11 vertically upward and the tail end 12 flat on the mounting table. The image side of the end lens 2 is placed on the tail end 12 of the pressure ring 1 with the image side facing down. After fixing the connection by applying glue or welding, a light shield 3 is set on the image side of the end lens 2 to make the connection between the end lens 2 and the pressure ring 1 more stable.

[0047] Laser welding is the preferred welding method.

[0048] In one embodiment of the present invention, preferably, the lens barrel 4 is provided with an annular groove, and in step S3, the mating end 11 of the pressure ring 1 is embedded in the annular groove.

[0049] In this embodiment, the lens barrel 4 is provided with an annular groove that is adapted to the mating end 11 of the pressure ring 1. During the lens assembly process, after the end lens 2 and the pressure ring 1 are fixed, the mating end 11 of the pressure ring 1 is aligned with the annular groove of the lens barrel 4 and embedded.

[0050] In one embodiment of the present invention, preferably, the pressure ring 1 is doped with glass fiber or other chemically stable substances during molding.

[0051] In this embodiment, the pressure ring 1 needs to be doped with glass fiber or other substances, including ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4 or carbon black particles, during the molding process. This can improve the overall hardness and rigidity of the pressure ring 1, prevent the long mating end 11 from breaking or deforming, and thus improve the stability of the pressure ring 1.

[0052] In one embodiment of the present invention, preferably, glass fiber or other chemically stable substances are doped during the molding of the lens barrel 4.

[0053] In this embodiment, glass fiber or other substances, including ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4 or carbon black particles, need to be doped during the forming of the lens barrel 4. This can ensure the hardness and rigidity of the aperture position of the lens barrel 4, effectively prevent the lens barrel 4 from deforming or breaking, thereby improving the stability of the lens barrel 4.

[0054] In one embodiment of the present invention, preferably, in step S1, the accessory includes at least one of a light-shielding sheet 3 and a spacer 5.

[0055] In this embodiment, the gap between lenses can be adjusted by setting the spacer 5. The spacer 5 can be made of metal, which helps to prevent the high-temperature deformation of the plastic spacer 5. The light shield 3 helps to eliminate stray light and improve the image quality of the lens.

[0056] In one embodiment of the present invention, preferably, in step S3, the lens barrel 4 and the pressure ring 1 are fixed by dispensing adhesive. Before the mating end 11 of the pressure ring 1 is embedded into the annular groove, water-soluble adhesive is applied to the annular groove and the contact portion between the lens barrel and the mating end.

[0057] In this embodiment, the purpose of using hydrosol is to dissolve part of the lens barrel 4 and part of the mating end 11, and then the two molten parts of the product are combined together, so that the overall product has good stability.

[0058] This invention discloses a lens assembly method. The lens includes a plurality of preceding lenses arranged sequentially from the object side to the image side along the optical axis and an end lens closest to the image side. During the lens assembly process, the plurality of preceding lenses and their corresponding accessories are first assembled inside the lens barrel. Then, the end lens is fixedly connected to the retaining ring. Finally, the lens barrel and the retaining ring are fixed with hydrosol to complete the overall assembly. This method avoids the problem of difficult adhesive application caused by narrow gaps between the lens and the lens barrel or between the retaining ring and the lens barrel, prevents the adhesive from deteriorating and losing strength due to long assembly time, avoids lens loosening, increases overall strength, and effectively prevents misalignment of the optical axis after long-term use. It also effectively improves the problem that conventional retaining rings still do not have good stability after hydrosol application.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A lens assembly method, the lens comprising a plurality of preceding lenses (6) arranged sequentially from the object side to the image side along the optical axis and an end lens (2) closest to the image side, wherein the inner diameter of the lens barrel (4) gradually increases from the object side to the image side, the lens assembly method comprising: S1. Place the lens barrel (4) upside down on the mounting table, and assemble the plurality of preceding lenses (6) and accessories into the lens barrel (4) in sequence; S2. The end lens (2) closest to the image side is fixedly connected to the pressure ring (1) to form an end assembly; the pressure ring (1) includes a mating end (11) and a tail end (12) that are perpendicular to each other. The mating end (11) is used to connect with the lens barrel (4), and the tail end (12) is used as the support end of the end lens (2). In step S2, the mating end (11) of the pressure ring (1) is placed vertically upward, the tail end (12) is placed on the mounting table, and the image side of the end lens (2) is placed downward on the tail end (12) of the pressure ring (1). The end lens (2) is installed in the pressure ring (1) by dispensing glue or laser welding. The image side of the end lens (2) is "M" shaped. S3. The end assembly is upside down as a whole, and the end lens (2) and the pressure ring (1) are fixed in the lens barrel (4); An annular groove is provided on the lens barrel (4). Before the mating end (11) of the pressure ring (1) is embedded into the annular groove, a water-soluble adhesive is applied to the annular groove and the contact part between the lens barrel (4) and the mating end (11). The mating end (11) of the pressure ring (1) is embedded into the annular groove, and part of the lens barrel (4) and part of the mating end (11) are dissolved by the water-soluble adhesive, so that the two molten products are combined together.

2. The lens assembly method according to claim 1, characterized in that, When the pressure ring (1) is formed, it is doped with any one or more chemically stable substances, such as glass fiber, ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4 or carbon black particles.

3. The lens assembly method according to claim 1, characterized in that, When the lens barrel (4) is formed, it is doped with any one or more chemically stable substances, such as glass fiber, ITO, ZrO2, Al2O3, ZnO, TiO2, Al(OH)3, BaSO4 or carbon black particles.

4. The lens assembly method according to claim 1, characterized in that, In step S1, the accessory includes at least one of a light-shielding sheet and a spacer.

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