CN211149152U - Lens assembly and optical imaging system - Google Patents

Abstract

The utility model provides a lens subassembly and optical imaging system. The lens subassembly includes: the lens comprises an optical part and a non-optical part which is connected with the optical part and supported on the periphery of the optical part, wherein the non-optical part comprises a bearing surface and a connecting surface connected with the bearing surface, and the connecting surface is close to the optical axis of the lens relative to the bearing surface; and the ink coating layer is arranged on the connecting surface. The technical scheme of the utility model under the prerequisite of guaranteeing the lens overall structure size, thereby can improve stray light and improve the imaging quality.

Description

Lens assembly and optical imaging system

Technical Field

The utility model relates to an optical imaging system's formation of image field particularly, relates to a lens subassembly and optical imaging system.

Background

With the rapid development of the smart phone market, consumers have higher and higher requirements on the ratio of the mobile phone screen while pursuing high pixels and large image planes, so that the area of the screen opening for arranging the mobile phone lens is smaller and smaller, the structural design of the mobile phone lens gradually tends to be miniaturized, the overall structural size of the mobile phone lens is smaller and smaller, and the requirements on the precision of each component are correspondingly higher and higher. Meanwhile, in order to ensure the imaging quality of the mobile phone lens, the stray light problem still cannot be ignored, and even the requirement is higher. However, due to the limitation of the overall structural size of the lens, there is not enough space on the lens to provide a structure for eliminating stray light, and thus, the imaging quality is low.

That is, in the optical imaging system known to the inventor, since the lens is limited in overall size of the structure, there is not enough space on the lens to provide a structure capable of eliminating stray light.

Disclosure of Invention

The utility model discloses a main aim at provides a lens subassembly and optical imaging system, thereby this technical scheme can improve stray light and improve the imaging quality under the prerequisite of guaranteeing lens overall structure size.

In order to achieve the above object, according to an aspect of the present invention, there is provided a lens assembly, the lens assembly including: the lens comprises an optical part and a non-optical part which is connected with the optical part and supported on the periphery of the optical part, wherein the non-optical part comprises a bearing surface and a connecting surface connected with the bearing surface, and the connecting surface is close to the optical axis of the lens relative to the bearing surface; and the ink coating layer is arranged on the connecting surface.

Furthermore, the ink coating layer is annular, and at least part of the surface of the connecting surface is provided with the ink coating layer.

Further, the ink coating layer comprises an annular body, the thickness of the annular body is h1, the height of the annular body is L4, wherein h1 is more than or equal to 0.005mm and less than or equal to 0.02mm, L4 is more than or equal to 0.02mm, or an angle a1 is formed between the annular body and an optical axis, and wherein a1 is more than or equal to 10 degrees and less than or equal to 90 degrees.

The ink coating layer comprises a first ring segment and a second ring segment connected with the first ring segment, wherein the thickness of the first ring segment is h2, the thickness of the second ring segment is h3, the thickness of h2 is not less than 0.005mm and not more than 0.02mm, the thickness of h3 is not less than 0.005mm and not more than 0.02mm, or the ink coating layer comprises a first ring segment and a second ring segment connected with the first ring segment, the height of the ink coating layer is L5, wherein L5 is not less than 0.02mm, or the ink coating layer comprises a first ring segment and a second ring segment connected with the first ring segment, an included angle a2 is formed between the first ring segment and the optical axis, an included angle a3 is formed between the second ring segment and the optical axis, wherein a2 is not less than 10 degrees and not more than 90 degrees, and a3 is not more than 10 degrees and not more than 90 degrees.

Further, the lens assembly further comprises an ink overflow prevention structure, and the ink overflow prevention structure is arranged at the joint of the connecting surface and the optical portion or at one end of the connecting surface close to the optical portion.

Furthermore, the ink overflow prevention structure is an annular groove, the depth of the annular groove is L2, wherein the thickness of the annular groove is not less than 0.005mm and not more than L2 mm and not more than 0.01 mm.

Further, the cross section of the annular groove is trapezoidal, the width of the top opening of the annular groove is L1, the width of the bottom surface of the trapezoidal annular groove is L3, wherein 0.015mm is not less than L1 is not less than 0.03mm, 0mm is not less than L3 is not less than 0.015mm, or the annular groove is provided with a first side surface and a second side surface which are oppositely arranged, an included angle b1 is formed between the first side surface and the optical axis, an angle b2 is formed between the second side surface and the optical axis, wherein b1 is not less than 0 degree and not more than 80 degrees, and b2 is not less than 0 degree and not more than 80 degrees.

Furthermore, the object side surface or the image side surface of the non-optical part is provided with a connecting surface, so that the ink coating layer is correspondingly arranged on the object side surface or the image side surface.

Further, the thickness of the non-optical part is H, wherein H is less than or equal to 0.25mm, or the height of the non-optical part is L6 mm, wherein 0.15mm is less than or equal to L6 mm is less than or equal to 1 mm.

Furthermore, the lens assembly comprises a plurality of lenses, and at least one lens is provided with an ink coating layer.

According to another aspect of the present invention, there is provided an optical imaging system, including: a lens barrel; the lens is arranged in the lens barrel and is the lens.

Further, the lens barrel is provided with a mounting through hole, and when the plurality of lenses are arranged in the mounting through hole in sequence from the object side to the image side along the optical axis.

Further, the optical imaging system further comprises a spacer ring, and the spacer ring is arranged between two adjacent lenses.

Furthermore, the optical imaging system also comprises a separation baffle plate, and when a space ring is arranged between two adjacent lenses, the separation baffle plate is arranged between the space ring and the lens adjacent to the space ring; when the space ring is not arranged between two adjacent lenses, the separation blocking piece is arranged between the two adjacent lenses.

Use the technical scheme of the utility model, stray light is eliminated through the mode that sets up the inking layer on the face of connecting at non-optical portion, because the area of inking region of inking layer is less, even under the condition of the non-optical portion of lens at minimum proportion (be the minimum of non-optical portion percentage of whole lens area promptly), also can scribble the china ink on connecting the face, utilize the inking layer to absorb stray light, the imaging quality of lens has been ensured, overcome the problem that exists like this because the lens receives overall structure size's restriction and can't set up extra part on the lens and eliminate stray light among the correlation technique, thereby make optical imaging system, when satisfying the miniaturization demand, also have better formation of image quality.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of an embodiment of an optical imaging system according to the present invention;

FIG. 2 shows a close-up view of a first optic of the optical imaging system of FIG. 1;

FIG. 3 shows a close-up view of a third optic of the optical imaging system of FIG. 1;

FIG. 4 is a schematic structural diagram of an anti-overflow structure disposed on a first lens of the optical imaging system of FIG. 1; and

fig. 5 is a schematic structural diagram illustrating an ink overflow prevention structure provided at the third lens of the optical imaging system in fig. 1.

Wherein the figures include the following reference numerals:

10. a lens barrel; 11. mounting a through hole; 21. an optical portion; 22. a non-optic portion; 221. a bearing surface; 222. a connecting surface; 30. an annular body; 41. a first ring segment; 42. a second ring segment; 50. an annular groove; 51. a bottom surface; 52. the top is open; 53. a first side surface; 54. a second side.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In the embodiment of the present invention, the object side refers to a side of each component (such as the lens barrel 10 or the lens) close to the object; the image side is opposite to the object side, and means a side of each member near imaging. The object side surface refers to the surface of the lens facing the object side and the image side surface refers to the surface of the lens facing the image side.

The utility model discloses an in the embodiment of the utility model, the utility model provides an optical imaging system, this optical imaging system include lens cone 10 and the lens of setting in lens cone 10. The optical imaging system comprises five lenses, namely a first lens P1, a second lens P2, a third lens P3, a fourth lens P4 and a fifth lens P5 in sequence. Of course, in alternative embodiments not shown in the drawings, the number of lenses may also be set to two or six or more according to actual needs.

In an optical imaging system known by the inventor, stray light is eliminated by a stray light prevention structure integrally formed on a lens, and the size of the lens is large due to the additional arrangement of the stray light prevention structure, so that the requirement of miniaturization of the existing lens is difficult to meet. Under the miniaturized prerequisite of camera lens that satisfies optical imaging system, the utility model discloses a technical concept of the embodiment is the connection face of the non-optical portion of make full use of lens, sets up the inking layer on connecting the face, is guaranteeing under the condition that the non-optical portion of lens accounts for than (the minimum of non-optical portion percentage of whole lens area promptly) at the minimum like this, and usable inking layer absorbs stray light in order to ensure optical imaging system's formation of image quality.

Of course, in alternative embodiments not shown in the drawings, the ink-coated layer can also be provided on different lenses according to the actual situation. Any technical solution that satisfies the above concept is within the scope of the present application. The utility model discloses a lens portion that optical imaging system in the embodiment of the utility model mainly is applied to cell-phone or panel computer certainly, also can be applied to the lens portion of other devices such as camera.

As shown in fig. 1, the present invention provides a lens assembly, which comprises a lens and an ink coating layer, wherein the lens comprises an optical portion 21 and a non-optical portion 22 connected with the optical portion 21 and supported at the periphery of the optical portion 21, the non-optical portion 22 comprises a bearing surface 221 and a connecting surface 222 connected with the bearing surface 221, and the connecting surface 222 is close to the optical axis of the lens relative to the bearing surface 221; an ink-applied layer is provided on the connection face 222.

According to the arrangement, stray light is eliminated by arranging the ink coating layer on the connecting surface 222 of the non-optical part, ink can be coated on the connecting surface 222 even if the non-optical part of the lens is in the minimum proportion (namely the minimum value of the percentage of the non-optical part in the whole lens area) due to the small area of the ink coating layer, the stray light is absorbed by the ink coating layer, and the imaging quality of the lens is ensured.

Of course, in an alternative embodiment not shown in the drawings of the present invention, the connection surface 222 may be subjected to a conventional atomization process according to actual conditions.

It should be noted that the principle of the conventional atomization processing is to change mirror reflection into diffuse reflection, which weakens the energy of stray light reaching the image plane, but cannot completely eliminate the energy, thereby causing defects such as white and fog of the image. The ink coating can effectively absorb stray light energy by using the ink layer, and can absorb the energy of the stray light to a greater extent or even completely. That is, the ink application process has a stronger ability to eliminate stray light than the conventional atomization process.

As shown in fig. 1, in the embodiment of the present invention, the ink-applying layer is annular, and the ink-applying layer is disposed on the entire surface of the connecting surface 222. In the above arrangement, since the ink-applying layer covers the entire surface of the connecting surface 222, the ink-applying layer can absorb stray light with a larger incident angle, so that the ink-applying layer has a stronger ability of absorbing stray light, and the imaging quality of the optical imaging system is better ensured.

Of course, in an alternative embodiment not shown in the drawings of the present invention, an ink-applying layer may be provided on a part of the surface of the connection surface 222 according to the actual situation.

Preferably, the ink-applying layer is composed of a black resin material and glue.

Specifically, as shown in fig. 1, the image-side surface of the non-optical portion 22 of the first lens P1 is provided with a connecting surface 222 so that the ink-coated layer is correspondingly provided on the image-side surface.

Specifically, as shown in fig. 2, in the embodiment of the present invention, an ink coating layer is disposed on the connecting surface 222 of the first lens P1, the ink coating layer includes the annular body 30, the thickness of the annular body 30 is h1, the height of the annular body 30 is L4, wherein 0.005mm is not less than h1 is not less than 0.02mm, L4 is not less than 0.02mm, an angle a1 is formed between the annular body 30 and the optical axis, and wherein a1 is not less than 10 ° and not more than 90 °.

In the above arrangement, the thickness h1, the height L4 and the angle a1 of the ink coating layer are limited in the above range, so that the ink coating layer and the connecting surface 222 have good connecting strength, and can be better fixed on the surface of the connecting surface 222, thereby preventing the ink coating layer from cracking or falling off from the lens, and further ensuring the stability and reliability of the connection between the ink coating layer and the connecting surface 222.

Of course, in an alternative embodiment not shown in the drawings of the present invention, the annular body 30 has an angle a1 with respect to the optical axis, wherein a1 is 10 ° -90 ° -10 ° -90 °, and the thickness h1 of the annular body 30 and the height L4 of the annular body 30 can be limited to other ranges according to the actual situation.

In the embodiment of the present invention, as shown in fig. 2, the height of the non-optical portion 22 of the first lens P1 is L6 mm, wherein 0.15mm L6 mm 1mm, the height L6 of the non-optical portion 22 is set within the above range to facilitate the injection molding of the lens.

Specifically, as shown in fig. 3, the object-side surface of the non-optical portion 22 of the third lens P3 is provided with a connecting surface 222 so that the ink-applied layer is correspondingly provided on the object-side surface.

Specifically, as shown in fig. 3, in an embodiment of the present invention, an ink coating layer is disposed on a connection surface 222 of a third lens P3, and the ink coating layer includes a first ring segment 41 and a second ring segment 42 connected to the first ring segment 41, where the first ring segment 41 has a thickness h2, the second ring segment 42 has a thickness h3, where 0.005mm is greater than or equal to h2 and less than or equal to 0.02mm, 0.005mm is greater than or equal to h3 and less than or equal to 0.02mm, the ink coating layer includes the first ring segment 41 and the second ring segment 42 connected to the first ring segment 41, the height of the ink coating layer is L, where L is greater than or equal to 0.02mm, the ink coating layer includes the first ring segment 41 and the second ring segment 42 connected to the first ring segment 41, an included angle a2 is formed between the first ring segment 41 and the optical axis, an included angle 493a 3 is formed between the second ring segment 42 and the optical axis, where a2 is greater than or equal to 10 ° and equal to 90 °.

In the above arrangement, the thickness h2 of the first ring segment 41, the thickness h3 of the second ring segment 42, the height L4 of the ink coating layer, the included angle a1 and the included angle a2 are limited in the above range, so that the ink coating layer and the connecting surface 222 can be ensured to have better connecting strength, and the ink coating layer can be better fixed on the surface of the connecting surface 222, thereby avoiding the ink coating layer from cracking or falling off from the lens, and further ensuring the stability and reliability of the connection between the ink coating layer and the connecting surface 222.

Of course, in an alternative embodiment not shown in the drawings of the present invention, the first ring segment 41 has an included angle a2 with the optical axis, and the second ring segment 42 has an included angle a3 with the optical axis, wherein a2 is greater than or equal to 10 ° and less than or equal to 90 °, and a3 is greater than or equal to 10 ° and less than or equal to 90 °, the thickness h2 of the first ring segment 41, the thickness h3 of the second ring segment 42, the height L4 of the ink-applying layer, the included angle a1, and the included angle a2 may be limited in other ranges according to the actual conditions.

Specifically, as shown in fig. 3, in the embodiment of the present invention, the thickness of the non-optical portion 22 of the third lens P3 is H, wherein H is less than or equal to 0.25 mm. Setting the thickness H of the non-optical portion 22 within the above range facilitates injection molding of the lens.

In the embodiment of the utility model, the image side of the first lens is provided with the ink coating layer, and the object side of the third lens is provided with the ink coating layer. Of course, in alternative embodiments not shown in the drawings, three or more lenses may be provided with ink layers according to actual needs. Alternatively, an ink-coated layer is provided on only one lens.

As shown in fig. 4 and 5, in the embodiment of the present invention, the lens assembly further includes an ink overflow prevention structure, and the ink overflow prevention structure is disposed at an end of the connection surface 212 close to the optical portion 21.

In the arrangement, the ink overflow prevention structure can prevent the ink coating layer from diffusing to the optical part area of the lens, and effectively control the ink coating range of the ink coating layer, so that the problem that the imaging quality of the lens is influenced because the ink coating layer diffuses to the optical part area of the lens is avoided, and the imaging quality of an optical imaging system is further ensured.

Of course, in an alternative embodiment not shown in the drawings of the present invention, the ink overflow preventing structure may be disposed at the connection between the connection surface 222 and the optical portion 21 according to actual conditions.

Specifically, as shown in fig. 4 and 5, in the embodiment of the present invention, the ink overflow preventing structure is an annular groove 50, and the depth of the annular groove 50 is L2, wherein 0.005mm is less than or equal to L2 mm is less than or equal to 0.01 mm.

In the above arrangement, the overflowed ink flows into the annular groove 50, so that the annular groove 50 blocks the ink-coated layer from diffusing to the optical part area of the lens, thereby avoiding the occurrence of the condition that the imaging quality of the lens is influenced because the ink-coated layer diffuses to the optical part area of the lens, and further ensuring the imaging quality of the optical imaging system.

In addition, defining the depth L2 of the annular groove 50 within the above-described ranges allows the ink-overflow prevention structure to have sufficient space to accommodate the overflowing ink, thereby avoiding the spreading of the ink-applied layer to the optic area of the lens due to the small accommodation space of the ink-overflow prevention structure.

It should be noted that the annular groove 50 as the ink overflow prevention structure is directly formed on the connecting surface 212 of the lens, so that the size of the lens is not increased in the radial direction and the axial direction of the lens, and even if the non-optical portion of the lens is at the minimum ratio (i.e. the minimum value of the percentage of the non-optical portion in the whole lens area), the non-optical portion can still be formed on the lens, and the size of the whole lens structure is slightly influenced.

Specifically, as shown in fig. 4 and 5, in the embodiment of the present invention, the cross-section of the annular groove 50 is trapezoidal, the width of the top opening 52 of the annular groove 50 is L1, and the width of the bottom surface 51 of the trapezoidal annular groove 50 is L3, wherein 0.015mm is not less than L1 is not less than 0.03mm, 0mm is not less than L3 is not less than 0.015mm, the annular groove 50 has a first side surface 53 and a second side surface 54 which are oppositely disposed, an included angle b1 is formed between the first side surface 53 and the optical axis, an included angle b2 is formed between the second side surface 54 and the optical axis, wherein 0 ° is not less than b1 is not less than 80 °, and 0 ° is not less than b2 is not less than 80 °.

In the above arrangement, the cross section of the annular groove 50 is trapezoidal, and the two trapezoidal waists have a flow guiding function, so that overflowed ink can be guided into the annular groove 50, and the annular groove 50 can well block the ink-coated layer from diffusing to the optical part area of the lens, thereby avoiding the occurrence of the condition that the imaging quality of the lens is affected due to the fact that the ink-coated layer diffuses to the optical part area of the lens, and further ensuring the imaging quality of the optical imaging system.

In addition, defining width L1 of top opening 52, width L3 of bottom surface 51, included angle b1, and included angle b2 within the above ranges allows the ink-overflow prevention structure to have sufficient space to accommodate overflowing ink, thereby avoiding spreading of the ink-coated layer to the optical portion area of the lens due to the small accommodation space of the ink-overflow prevention structure.

As shown in fig. 1, in the embodiment of the present invention, the lens barrel 10 has a plurality of mounting through holes 11, and when there are a plurality of lenses, the plurality of lenses are sequentially disposed in the mounting through holes 11 from the object side to the image side along the optical axis.

In the above arrangement, the mounting through holes 11 provide a mounting space for the lenses, so as to ensure that the lenses are correctly mounted in the lens barrel 10, thereby meeting the assembly requirements of the optical imaging system.

Specifically, as shown in fig. 1, in the embodiment of the present invention, the first lens P1, the second lens P2, the third lens P3, the fourth lens P4 and the fifth lens P5 are disposed in the mounting through hole 11 in the order from the object side to the image side along the optical axis.

As shown in fig. 1, in an embodiment of the present invention, the optical imaging system further includes a spacer ring, and the spacer ring is disposed between two adjacent lenses. In the arrangement, the space ring is arranged between two adjacent lenses, so that a fixed distance can be kept between the two adjacent lenses, and the installation requirement of the lenses in the optical imaging system is met.

Specifically, as shown in fig. 1, a first space q1 is provided between the third lens P3 and the fourth lens P4, and a second space q2 is provided between the fourth lens P4 and the fifth lens P5.

As shown in fig. 1, in the embodiment of the present invention, the optical imaging system further includes a blocking plate, and when a spacer is disposed between two adjacent lenses 20, the blocking plate is disposed between the spacer and the lens 20 adjacent to the spacer; when no spacer is provided between two adjacent lenses 20, a barrier is provided between the two adjacent lenses 20. In the arrangement, the blocking piece can block stray light in incident light from entering the optical part of the next lens, so that the optical imaging quality of the optical imaging system is ensured.

Specifically, as shown in fig. 1, in the embodiment of the present invention, a first separation blocking piece a is disposed between the first lens P1 and the second lens P2, a second separation blocking piece b is disposed between the second lens P2 and the third lens P3, a third separation blocking piece c is disposed between the third lens P3 and the first separation ring q1, a fourth separation blocking piece d is disposed between the first separation ring q1 and the fourth lens P4, and a fifth separation blocking piece e is disposed between the second separation ring q2 and the fifth lens P5.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: stray light is eliminated by arranging the ink coating layer on the connecting surface of the non-optical part, because the area of the ink coating layer is small, ink can be coated on the connecting surface even if the non-optical part of the lens is under the condition of the minimum proportion (namely the minimum value of the percentage of the non-optical part in the whole lens area), the stray light is absorbed by the ink coating layer, and the imaging quality of the lens is ensured.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A lens assembly, the lens assembly comprising:

the lens comprises an optical part (21) and a non-optical part (22) which is connected with the optical part (21) and supported on the periphery of the optical part (21), wherein the non-optical part (22) comprises a bearing surface (221) and a connecting surface (222) connected with the bearing surface (221), and the connecting surface (222) is close to the optical axis of the lens relative to the bearing surface (221);

an ink-applying layer disposed on the connection surface (222).

2. The lens assembly of claim 1, wherein the ink layer is annular and at least a portion of the surface of the attachment face (222) is provided with the ink layer.

3. The lens assembly of claim 2, wherein the ink-applied layer comprises an annular body (30), the annular body (30) having a thickness h1, the annular body (30) having a height L4, wherein 0.005mm ≦ h1 ≦ 0.02mm, L4 ≦ 0.02mm, or the annular body (30) having an angle a1 with the optical axis, wherein 10 ° ≦ a1 ≦ 90 °.

4. The lens assembly of claim 2,

the ink coating layer comprises a first ring section (41) and a second ring section (42) connected with the first ring section (41); the thickness of the first ring segment (41) is h2, the thickness of the second ring segment (42) is h3, and h2 is not less than 0.005mm and not more than 0.02 mm; h3 is more than or equal to 0.005mm and less than or equal to 0.02 mm; alternatively, the first and second electrodes may be,

the ink coating layer comprises a first ring segment (41) and a second ring segment (42) connected with the first ring segment (41), the height of the ink coating layer is L5, wherein L5 is more than or equal to 0.02mm, or,

the ink coating layer comprises a first ring segment (41) and a second ring segment (42) connected with the first ring segment (41), an included angle a2 is formed between the first ring segment (41) and the optical axis, an included angle a3 is formed between the second ring segment (42) and the optical axis, wherein a2 is larger than or equal to 10 degrees and smaller than or equal to 90 degrees, and a3 is larger than or equal to 10 degrees and smaller than or equal to 90 degrees.

5. The lens assembly according to any one of claims 1 to 4, further comprising an ink-overflow prevention structure provided at the junction of the connection face (222) and the optical portion (21) or at an end of the connection face (222) near the optical portion (21).

6. The lens assembly of claim 5, wherein the ink overflow prevention structure is an annular groove (50), the depth of the annular groove (50) being L2, wherein 0.005mm ≦ L2 ≦ 0.01 mm.

7. The lens assembly of claim 6, wherein the annular groove (50) is trapezoidal in cross-section, the top opening (52) of the annular groove (50) has a width of L1, and the bottom surface (51) of the trapezoidal annular groove (50) has a width of L3, wherein 0.015mm ≦ L1 ≦ 0.03mm, and 0mm ≦ L3 ≦ 0.015mm, or the annular groove (50) has oppositely disposed first (53) and second (54) sides, the first side (53) having an angle b1 with the optical axis and the second side (54) having an angle b2 with the optical axis, wherein 0 ° ≦ b1 ≦ 80 °, 0 ° ≦ b2 ≦ 80 °.

8. The lens assembly of any one of claims 1 to 4, characterized in that the non-optic portion (22) has a thickness H, wherein H ≦ 0.25mm, or the non-optic portion (22) has a height L6, wherein 0.15mm ≦ L6 ≦ 1 mm.

9. The lens assembly of any one of claims 1-4, including a plurality of the lenses, at least one of the lenses having the ink-applied layer thereon.

10. An optical imaging system, characterized in that the optical imaging system comprises:

a lens barrel (10);

a lens provided within the lens barrel (10), the lens being the lens of any one of claims 1 to 9.

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