Optical lens and lens locking method for optical lens

Abstract

The invention provides an optical lens which comprises a lens barrel, at least one lens, at least one annular ring and at least one limiting piece, the lens barrel is provided with a containing cavity, and the inner side wall of the lens barrel is provided with an annular containing groove. Wherein an opening of the annular containing groove of the inner side wall of the lens barrel is arranged to face the containing cavity of the lens barrel, the limiting piece is fixed to the inner side wall of the lens barrel, the annular ring is arranged in the annular containing groove, and the lens is arranged in the containing cavity of the lens barrel. The lens is arranged so that the inner side of the periphery of the lens at least partially abuts against the limiting piece, and the outer side of the periphery of the lens at least partially right faces the opening of the annular containing groove. The annular containing groove, the lens and the annular ring are arranged so that the annular ring can at least partially abut against the inner wall of the annular containing groove and at least partially abut against the outer side of the periphery.

Description

Technical Field

[0001] The invention relates to an optical lens, and in particular to a lens locking method for an optical lens. Background Art

[0002] Optical lenses play an increasingly important role in production and life, and are widely used in various scenarios, such as videography, machine vision, etc. The key component that determines the imaging quality of an optical lens is the lens (or lens) of the optical lens, and the main factors affecting the lens are the lens composition and the relative position of the lens. Especially for optical lenses used in special scenarios, such as those in the security, automotive and other industries, the use environment is relatively harsh. Keeping the relative position of the lens of the optical lens fixed can improve the stability and reliability of the optical lens and ensure the imaging quality.

[0003] The existing optical lens lens fixing methods mainly include glue point fixing and pressure ring fixing. The pressure ring fixing is to set a pressure ring between the lens and the screw locking mechanism, and lock it through the screw locking mechanism. However, the pressure ring fixing requires the lens barrel to have sufficient length, thickness and accommodation space. When the internal space of the optical lens is small, it is often difficult to leave enough space for thread processing; screw locking often requires sufficient stroke, the lens barrel length is too short, the fastening thread is too short, it is difficult to provide sufficient locking force and easy to fall off; the lens barrel thickness is small, which will lead to difficulties in processing the fastening thread, and the screw groove depth is not enough, affecting the provision of locking force; the lens barrel thickness is small, and it may even affect the stability of the lens barrel. In addition, the pressure ring fixing is not suitable for the case where the pressure ring is small. When the pressure ring is small, the clamping effect is poor, the pressure ring processing is difficult, the pressure ring is easy to deform, and the pressure ring assembly is difficult. In other words, the pressure ring fixing will increase the volume of the optical lens, and the application scenario is greatly limited. Glue point fixing is also a commonly used optical lens processing technology, which is suitable for small optical lenses. However, optical lenses fixed by glue are prone to loosening in harsh environments, their service life and stability are difficult to guarantee, and the exposed glue affects the appearance of the optical lens. Summary of the invention

[0004] The main advantage of the present invention is to provide an optical lens with high reliability and low processing cost.

[0005] Another advantage of the present invention is to provide an optical lens having simpler processing steps, thereby improving the yield rate of the optical lens.

[0006] Another advantage of the present invention is to provide an optical lens, which forms an elastic retaining force between the lens and the inner wall of the lens barrel by means of an annular ring made of elastic material disposed between the lens and the inner wall of the lens barrel, so as to ensure the sealing between the lens barrel and the lens while ensuring the fixing of the lens. At the same time, the elastic retaining force between the lens and the inner wall of the lens barrel generated by the annular ring made of elastic material can also prevent the lens from being damaged by the rigid force.

[0007] Another advantage of the present invention is to provide an optical lens, which forms a continuously distributed elastic retaining force between the lens and the inner wall of the lens barrel through an annular ring made of elastic material arranged between the lens and the inner wall of the lens barrel, so as to ensure continuous and uniform distribution of force on the lens.

[0008] Another advantage of the present invention is that it provides an optical lens, the lens barrel of which does not need to reserve the stroke and thread required for screw connection and locking, and does not require an additional glue dispensing step, thereby reducing the difficulty of the process and the complexity of the processing equipment. In other words, the assembly of the optical lens of the present invention does not require complex assembly equipment, and the process is simple, easy to implement, and low cost.

[0009] Another advantage of the present invention is that it provides a lens locking method for an optical lens, which has a simple process, is easy to implement and has low cost.

[0010] Other advantages and features of the present invention are fully apparent from the following detailed description.

[0011] Accordingly, according to the present invention, an optical lens having at least one of the above advantages includes:

[0012] a lens tube;

[0013] at least one lens;

[0014] at least one annular ring; and

[0015] At least one limiting member, wherein the lens barrel has a accommodating cavity, the inner side wall of the lens barrel has an annular accommodating groove, wherein the opening of the annular accommodating groove of the inner side wall of the lens barrel is arranged to face the accommodating cavity of the lens barrel, the limiting member is fixed to the inner side wall of the lens barrel, the annular ring is arranged in the annular accommodating groove, the lens is arranged in the accommodating cavity of the lens barrel, and the lens is arranged so that the inner side of the periphery of the lens at least partially presses against the limiting member, and the outer side of the periphery at least partially faces the opening of the annular accommodating groove, wherein the annular accommodating groove, the lens and the annular ring are arranged so that the annular ring at least partially presses against the inner wall of the annular accommodating groove and at least partially presses against the outer side of the periphery.

[0016] According to another aspect of the present invention, the present invention further provides a lens locking method for an optical lens, comprising the following steps:

[0017] Putting the lens into the accommodating cavity of the lens barrel and making the inner side of the periphery of the lens at least partially attached to the stopper; and

[0018] The annular ring is squeezed into the annular accommodating groove of the lens barrel so that the annular ring is partially accommodated in the annular groove on the outer side of the periphery of the lens and partially accommodated in the annular accommodating groove on the inner wall of the lens barrel, so that the annular ring is maintained between the outer side of the periphery of the lens and the inner wall of the annular accommodating groove, wherein the annular accommodating groove on the inner wall of the lens barrel, the lens and the annular ring are arranged so that the annular ring can at least partially press against the inner wall of the annular accommodating groove on the inner wall of the lens barrel and at least partially press against the outer side of the periphery of the lens, wherein the lens barrel and the limiting member are both made of rigid material, and the annular ring is made of elastic material.

[0019] The above and other advantages of the present invention will be fully reflected in conjunction with the following description and the accompanying drawings.

[0020] The above and other advantages and features of the present invention are fully reflected in the following detailed description of the present invention and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of an assembly of an optical lens according to an embodiment of the present invention.

[0022] Figure 2 4 is a schematic cross-sectional view of an optical lens according to an embodiment of the present invention.

[0023] Figure 3 4 is a schematic cross-sectional view of a lens of an optical lens according to an embodiment of the present invention.

[0024] Figure 4 4 is a schematic three-dimensional diagram of a lens barrel of an optical lens according to an embodiment of the present invention.

[0025] Figure 5 4 is a schematic cross-sectional view of a lens of an optical lens according to an embodiment of the present invention.

[0026] Figure 6 1 is a flow chart of a lens locking method for an optical lens according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following description is provided to enable those skilled in the art to implement the present invention. Other obvious replacements, modifications and variations may occur to those skilled in the art. Therefore, the scope of protection of the present invention should not be limited to the exemplary embodiments described herein.

[0028] Those skilled in the art should understand that, unless otherwise specified herein, the terms "one" and "an" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple.

[0029] Those skilled in the art should understand that, unless otherwise specified herein, the directions or positions referred to by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positions shown in the drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the devices or elements involved must have a specific direction or position. Therefore, the above terms should not be understood as limiting the present invention.

[0030] Reference to the attached drawings of the specification Figures 1 to 5, an optical lens according to an embodiment of the present invention is illustrated, wherein the optical lens of the present invention comprises a lens barrel 10, at least one lens 20, at least one annular ring 30 and at least one stopper 40, wherein the lens barrel 10 has a accommodating cavity 100, the inner side wall 11 of the lens barrel 10 has an annular accommodating groove 110, wherein an opening 1101 of the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10 is arranged toward the accommodating cavity 100 of the lens barrel 10, the stopper 40 is fixed to the inner side wall 11 of the lens barrel 10, the annular ring 30 is arranged in the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10, the lens 20 is arranged The lens 20 is disposed in the accommodating cavity 100 of the lens barrel 10, and the lens 20 is arranged so that the inner side 211 of the periphery 21 of the lens 20 at least partially presses against the stopper 40, and the outer side 212 of the periphery 21 of the lens 20 at least partially faces the opening 1101 of the annular accommodating groove 110 of the inner side wall 11, wherein the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10, the lens 20 and the annular ring 30 are arranged so that the annular ring 30 at least partially presses against the inner wall 1102 of the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10 and at least partially presses against the outer side 212 of the periphery 21 of the lens 20. In some embodiments, the optical lens of the present invention includes a single lens 20. In other embodiments, the optical lens of the present invention includes two lenses 20. In other words, the annular ring 30 is disposed in the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10, and the annular ring 30 is pressed between the inner wall 1102 of the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10 and the outer side 212 of the peripheral edge 21 of the lens 20, so that the outer side 212 of the peripheral edge 21 of the lens 20 is subjected to an inward pressure, so that the inner wall 1102 of the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10 and the outer side 212 of the peripheral edge 21 of the lens 20 can be sealed by the annular ring 30, and the inner side 211 of the peripheral edge 21 of the lens 20 can be at least partially pressed against the stopper 40. Accordingly, the locking of the lens 20 of the optical lens of the present invention no longer requires a pressing ring fixation, nor does it require glue fixation. It can be understood that the lens barrel 10 and the stopper 40 are both made of rigid materials, and the annular ring 30 is made of elastic materials. Exemplarily, the lens barrel 10 and the stopper 40 are both made of rigid plastics, and the annular ring 30 is made of rubber material. Preferably, the stopper 40 is integrally formed on the inner side wall 11 of the lens barrel 10. Optionally, the stopper 40 is screwed and fixed to the inner side wall 11 of the lens barrel 10. Preferably, the optical axis of the lens 20 is parallel to the central axis of the accommodating cavity 100 of the lens barrel 10. More preferably, the optical axis of the lens 20 coincides with the central axis of the accommodating cavity 100 of the lens barrel 10. Preferably, the annular ring 30 is made of elastic material, and its hardness is 60 to 90 Shore hardness.When the hardness of the annular ring 30 is too low, lower than the Shore hardness of 60, it will cause its deformation to be too large, making it difficult to ensure that the lens 20 is pressed against the preset position, and the annular ring 30 cannot provide sufficient elastic force and support, resulting in the optical lens of the present invention being difficult to maintain the position of the lens 20 relative to the lens barrel 10 when a large vibration occurs; when the hardness of the annular ring 30 is higher than the Shore hardness of 90, it will cause the annular ring 30 to be too small in deformation and difficult to provide sufficient buffering between the lens 20 and the lens barrel 10, resulting in the lens 20 being damaged when a large vibration occurs in the optical lens of the present invention. In addition, if the hardness of the annular ring 30 is too low, it will cause it to be too easy to deform and difficult to be positioned at the preset position just right; if the hardness of the annular ring 30 is too high, it will cause insufficient deformation of itself and difficulty in assembly, which will reduce the yield rate of the optical lens of the present invention. Preferably, the hardness of the elastic material making the annular ring 30 is 65-80 Shore hardness to ensure that the annular ring 30 provides sufficient elastic force and support, but not too hard.

[0031] As shown in the attached picture Figure 2As shown, the annular ring 30, the peripheral edge 21 of the lens 20 and the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10 of the optical lens according to the embodiment of the present invention all have a uniform structure, and the cross section of the annular ring 30 is circular. It is worth noting that the annular ring 30, the peripheral edge 21 of the lens 20 and the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10 of the optical lens of the present invention all have a uniform structure, and the cross section of the annular ring 30 is circular, which is conducive to uniformly applying force to the outer side 212 of the peripheral edge 21 of the lens 20, so that when the optical lens of the present invention is vibrated, the lens 20 and the lens barrel 10 can vibrate synchronously, thereby ensuring that the relative position between the lens 20 and the lens barrel 10 remains unchanged and ensuring the imaging quality of the optical lens of the present invention. Secondly, the annular ring 30 of the optical lens according to the embodiment of the present invention, the peripheral edge 21 of the lens 20 and the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10 all have a uniform structure, and the cross-section of the annular ring 30 is circular, and the force is evenly applied to the outer side 212 of the peripheral edge 21 of the lens 20, which is also conducive to preventing the lens 20 from rotating around the axis due to uneven force on the peripheral edge 21 of the lens 20 when the optical lens of the present invention is vibrated. Thirdly, the lens 20 of the optical lens of the present invention is fixed by the annular ring 30, which can solve the problem that it is impossible to design an effective pressure ring due to spatial position limitations, and the problem that the pressure ring is too small and difficult to assemble, and significantly reduce the overall manufacturing cost of the optical lens. Thirdly, the existing glue-pointing fixing lens and screw-connecting pressure ring fixing are both rigid fixings, which are easy to be damaged and difficult to restore in an environment with frequent vibration. The lens 20 of the optical lens of the present invention is limited by the annular ring 30 made of elastic material, which can avoid the defects of the existing rigid limit. Due to the elastic effect between the lens 20 and the lens barrel 10, even in an environment with frequent vibrations, the lens 20 and the lens barrel 10 are not easily affected by the destructive effect of rigid force, and even if the annular ring 30 is deformed by force, it can be restored very quickly. Finally, the lens 20 of the optical lens of the present invention is fixed by the annular ring 30, which also simplifies the assembly process steps of the optical lens. The existing screw-connected pressure ring fixation not only requires mutually cooperating threaded structures, but also requires screw connection to be completed during assembly, and the screw connection cannot be too tight or too loose; the existing dispensing process not only requires special dispensing equipment, but also needs to ensure that the dispensing is uniform and continuous and that the glue does not overflow; since the annular ring 30 and the annular receiving groove 110 can be pre-designed, the optical lens of the present invention does not require the above-mentioned process steps, and only needs to set the annular ring 30 at an appropriate position between the lens barrel 10 and the outer side 212 of the peripheral edge 21 of the lens 20.It can be understood that the annular ring 30 of the optical lens of the present invention, the peripheral edge 21 of the lens 20 and the annular receiving groove 110 of the inner wall 11 of the lens barrel 10 all have a uniform structure, and the cross-section of the annular ring 30 is circular, so that the outer side 212 of the peripheral edge 21 of the lens 20 is subjected to a continuous, uniform and inward pressure.

[0032] As shown in the attached picture Figures 1 to 5 According to an embodiment of the optical lens of the present invention, the inner side wall 11 of the lens barrel 10 forms a limiting portion 111, the limiting member 40 is arranged on the inner side wall 11 of the lens barrel 10, wherein the limiting portion 111 is located on the outer side of the limiting member 40, wherein the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10 is formed on the limiting portion 111, wherein a gap 1110 is provided between the limiting member 40 and the limiting portion 111, and the gap 1110 is not greater than the thickness of the periphery 21 of the lens 20, so that the outer side 212 of the periphery 21 of the lens 20 is at least partially aligned with the opening 1101 of the annular accommodating groove 110 of the inner side wall 11.

[0033] As shown in the attached picture Figures 1 to 5 According to the optical lens of the embodiment of the present invention, the inner wall 1102 of the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10 has a bottom 11021 and a side portion 11022 extending outwardly from the bottom 11021, and the side portion 11022 of the inner wall 1102 of the annular accommodating groove 110 is arranged to at least partially face the outer side 212 of the peripheral edge 21 of the lens 20, and the spacing distance between the side portion 11022 of the inner wall 1102 of the annular accommodating groove 110 and the outer side 212 of the peripheral edge 21 of the lens 20 is not greater than the outer diameter of the annular ring 30, so as to keep the annular ring 30 pressed by the peripheral edge 21 of the lens 20 and located in the annular accommodating groove 110.

[0034] As shown in the attached picture Figures 1 to 5According to the optical lens of the embodiment of the present invention, the outer side 212 of the periphery 21 of the lens 20 forms an annular groove 2120, wherein the annular groove 2120 of the outer side 212 of the periphery 21 of the lens 20 is arranged to be opposite to the inner wall 1102 of the annular receiving groove 110, so that the annular ring 30 is partially received in the annular groove 2120 of the outer side 212 of the periphery 21 of the lens 20 and partially received in the annular receiving groove 110 of the inner side wall 11 of the lens barrel 10, so that the annular ring 30 is easier to be maintained between the outer side 212 of the periphery 21 of the lens 20 and the inner wall 1102 of the annular receiving groove 110 and is not easy to loosen. Preferably, the annular ring 30 of the optical lens according to the embodiment of the present invention, the peripheral edge 21 of the lens 20, the annular accommodating groove 110 of the inner side wall 11 of the lens barrel 10, and the annular groove 2120 of the outer side 212 of the peripheral edge 21 of the lens 20 all have a uniform structure, and the cross section of the annular ring 30 is circular. Preferably, the ratio of the inner diameter of the annular ring 30 in a natural state to the inner diameter of the annular groove 2120 of the lens 20 is 0.8 to 0.98, so that the annular ring 30 can be retained in the annular groove 2120, and when the annular ring 30 is assembled to the annular groove 2120, it is easier to assemble. More preferably, the shape and inner diameter size of the annular ring 30 are set according to the shape and size of the annular groove 2120 of the lens 20, so that the annular ring 30 can be adapted to the annular groove 2120 of the lens 20.

[0035] As shown in the attached picture Figures 1 to 6 According to an embodiment of the present invention, the present invention further provides a lens locking method for an optical lens, which comprises the following steps:

[0036] Step 1: placing the lens into the accommodating cavity of the lens barrel and making the inner side of the periphery of the lens at least partially attached to the stopper; and

[0037] Step 2: squeeze the annular ring into the annular receiving groove of the lens barrel, so that the annular ring is partially received in the annular groove on the outer side of the periphery of the lens and partially received in the annular receiving groove of the inner side wall of the lens barrel, so that the annular ring is maintained between the outer side of the periphery of the lens and the inner wall of the annular receiving groove, wherein the annular receiving groove of the inner side wall of the lens barrel, the lens and the annular ring are arranged so that the annular ring can at least partially press against the inner wall of the annular receiving groove of the inner side wall of the lens barrel and at least partially press against the outer side of the periphery of the lens, wherein the lens barrel and the stopper are both made of rigid material, and the annular ring is made of elastic material. Preferably, the spacing distance between the side of the inner wall of the annular receiving groove of the lens barrel and the outer side of the periphery of the lens is not greater than the outer diameter of the annular ring, so as to keep the annular ring being pressed by the periphery 21 of the lens in the annular receiving groove. Preferably, the ratio of the inner diameter of the annular ring in a natural state to the inner diameter of the annular groove of the lens is 0.8 to 0.98, so that the annular ring can be retained in the annular groove, and when the annular ring is assembled to the annular groove, it is easier to assemble. More preferably, the shape and inner diameter of the annular ring are set according to the shape and size of the annular groove of the lens, so that the annular ring can be adapted to the annular groove of the lens. Preferably, the annular ring is made of an elastic material, and its hardness is 60 to 90 Shore hardness, so as to provide the lens with an appropriate amount of deformation and sufficient buffering. When the hardness of the annular ring is lower than 60 Shore A hardness, it will cause its deformation to be too large, making it difficult to ensure that the lens is pressed against the preset position, and the annular ring cannot provide sufficient elastic force and support, resulting in the optical lens of the present invention being difficult to maintain the position of the lens relative to the lens barrel when a large vibration occurs; when the hardness of the annular ring is too high, higher than 90 Shore A hardness, it will cause the annular ring to be too small in deformation and difficult to provide sufficient buffering between the lens and the lens barrel, resulting in the optical lens of the present invention being damaged when a large vibration occurs. In addition, if the hardness of the annular ring is too low, it will cause it to be too easy to deform and difficult to be positioned at the preset position just right; if the hardness of the annular ring is too high, it will cause insufficient deformation of itself and difficulty in assembly, which will reduce the yield rate of the optical lens of the present invention. Preferably, the hardness of the elastic material making the annular ring 30 is 65-80 Shore A hardness to ensure that the annular ring 30 provides sufficient elastic force and support, but not too hard.

[0038] Those skilled in the art should understand that the above description and the embodiments shown in the drawings are only for illustrative explanation of the present invention, rather than for limitation of the present invention. All equivalent implementations, modifications and improvements within the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. An optical lens, characterized in that: include: a lens tube; at least one lens; at least one annular ring; and At least one limiting member, wherein the lens barrel has a accommodating cavity, the inner side wall of the lens barrel has an annular accommodating groove, wherein the opening of the annular accommodating groove of the inner side wall of the lens barrel is arranged to face the accommodating cavity of the lens barrel, the limiting member is fixed to the inner side wall of the lens barrel, the annular ring is arranged in the annular accommodating groove, the lens is arranged in the accommodating cavity of the lens barrel, and the lens is arranged so that the inner side of the periphery of the lens at least partially presses against the limiting member, and the outer side of the periphery at least partially faces the opening of the annular accommodating groove, wherein the annular accommodating groove, the lens and the annular ring are arranged so that the annular ring at least partially presses against the inner wall of the annular accommodating groove and at least partially presses against the outer side of the periphery.

2. The optical lens according to claim 1, characterized in that: The inner wall of the lens barrel forms a limiting portion, and the limiting member is arranged on the inner wall of the lens barrel, wherein the limiting portion is located on the outer side of the limiting member, wherein the annular accommodating groove is formed in the limiting portion, wherein the interval between the limiting member and the limiting portion is not greater than the thickness of the peripheral edge of the lens, so that the outer side of the peripheral edge at least partially faces the opening of the annular accommodating groove.

3. The optical lens according to claim 2, characterized in that: The inner wall of the annular accommodating groove of the inner side wall of the lens barrel has a bottom and a side portion extending outwardly from the bottom, and the side portion of the inner wall of the annular accommodating groove is arranged to be at least partially opposite to the outer side of the periphery of the lens, and the spacing distance between the side portion of the inner wall of the annular accommodating groove and the outer side of the periphery of the lens is not greater than the outer diameter of the annular ring.

4. The optical lens according to claim 2, characterized in that: An annular groove is formed on the outer side of the periphery of the lens, wherein the annular groove on the outer side of the periphery of the lens is arranged to be opposite to the inner wall of the annular accommodating groove, so that the annular ring is partially accommodated in the annular groove on the outer side of the periphery of the lens and partially accommodated in the annular accommodating groove on the inner wall of the lens barrel.

5. The optical lens according to claim 1, 2, 3 or 4, characterized in that: The annular ring, the periphery of the lens and the annular accommodating groove of the inner side wall of the lens barrel all have uniform structures, and the cross section of the annular ring is circular.

6. The optical lens according to claim 1, 2, 3 or 4, characterized in that: The lens barrel and the limiting member are both made of rigid materials, and the annular ring is made of elastic material.

7. The optical lens according to claim 4, characterized in that: The ratio of the inner diameter of the annular ring to the inner diameter of the annular groove of the lens is 0.8-0.

98.

8. A lens locking method for an optical lens, comprising the following steps: Putting the lens into the accommodating cavity of the lens barrel and making the inner side of the periphery of the lens at least partially attached to the stopper; and The annular ring is squeezed into the annular accommodating groove of the lens barrel so that the annular ring is partially accommodated in the annular groove on the outer side of the periphery of the lens and partially accommodated in the annular accommodating groove on the inner wall of the lens barrel, so that the annular ring is maintained between the outer side of the periphery of the lens and the inner wall of the annular accommodating groove, wherein the annular accommodating groove on the inner wall of the lens barrel, the lens and the annular ring are arranged so that the annular ring can at least partially press against the inner wall of the annular accommodating groove on the inner wall of the lens barrel and at least partially press against the outer side of the periphery of the lens, wherein the lens barrel and the limiting member are both made of rigid material, and the annular ring is made of elastic material.

9. The lens locking method according to claim 8, characterized in that: The annular ring, the periphery of the lens, the annular accommodating groove of the inner side wall of the lens barrel and the annular groove on the outer side of the periphery of the lens all have uniform structures, and the cross section of the annular ring is circular.

10. The lens locking method according to claim 9, characterized in that: The inner wall of the annular accommodating groove of the inner side wall of the lens barrel has a bottom and a side portion extending outwardly from the bottom, and the side portion of the inner wall of the annular accommodating groove is arranged to be at least partially opposite to the outer side of the periphery of the lens, and the spacing distance between the side portion of the inner wall of the annular accommodating groove and the outer side of the periphery of the lens is not greater than the outer diameter of the annular ring.

11. The lens locking method according to claim 8, characterized in that: The ratio of the inner diameter of the annular ring to the inner diameter of the annular groove of the lens is 0.8-0.98.

Images