Imaging lens

Abstract

The present utility model provides an imaging lens, comprising a lens barrel and a plurality of lenses accommodated in the lens barrel. The lenses at least include a first lens and a second lens arranged in sequence from an object side to an image side. The outer diameter of the second lens is at least 1.1 times or more the outer diameter of the first lens. The first lens is fixedly connected to the lens barrel by means of first fixing adhesives. The imaging lens of the present utility model is applicable to situations where imaging lenses having a large lens size difference are called for. By adhesively fixing a lens having a small lens size, the problem of reduced yield caused by deformation during lens assembly is alleviated, so that the imaging lens has a lighter weight and low cost.

Description

Imaging lens TECHNICAL FIELD

[0001] The utility model relates to optical imaging technical field especially relates to an imaging lens. BACKGROUND

[0002] Imaging lens is the essential component of electronic equipment (for example cell -phone), in some super small head imaging lens, because the limitation of structure makes the head of lens barrel shape small, tail shape big, head is imaging lens close to the one end of object side, tail is imaging lens close to the one end of image side, and, at least there is big difference between two adjacent lenses outside diameter.

[0003] In view of the problems existing in the prior art, in the related art, there is to add auxiliary bearing limit to the lens that is deformed more to improve the deformation of the lens, however, this way needs the cooperation between lens barrel, lens and light shield, and the auxiliary bearing limit usually needs to leave a certain gap to cooperate with the bearing structure of the lens barrel, which makes the deformation improvement of the above-mentioned lens can only reduce the deformation to a certain extent, and the structure is more complex. In the related art, the bearing misalignment is set on the metal spacer ring with high strength to improve the deformation of the lens. However, when using the metal spacer ring, on the one hand, the weight of the imaging lens itself is increased, and the cost is increased, on the other hand, the metal spacer ring has a requirement on the spacing height between the two lenses, when the thickness of the metal spacer ring is thin, the strength is small, and the lens will also be deformed when the assembly misalignment is large to a certain extent, thereby also affecting the yield of assembly. TECHNICAL PROBLEM

[0004] Therefore, it is necessary to provide a new imaging lens to solve the above technical problems. TECHNICAL SCHEME

[0005] The utility model discloses a kind of imaging lenses, and the purpose is to solve the problem of two adjacent lenses with big size difference in the small head imaging lens in prior art, easy deformation, low yield in assembly.

[0006] In order to achieve the above purpose, the utility model provides an imaging lens, the imaging lens includes: lens barrel and multiple lenses received in the lens barrel, the lens at least includes first lens and second lens arranged in sequence from object side to image side, the outer diameter of the second lens is at least 1.1 times and above of the outer diameter of the first lens, and the first lens is fixedly connected with the lens barrel by first fixing glue.

[0007] Preferably, the first lens comprises an image-side surface close to the image side, an object-side surface close to the object side, and a connecting surface connecting the image-side surface and the object-side surface, and the first fixing glue extends from the image-side surface of the first lens to the connecting surface of the first lens.

[0008] Preferably, a glue dispensing groove is formed between the first lens and the lens barrel in a circumferential direction of the first lens, and the first fixing glue is a plurality of glue dispensing grooves arranged at intervals in the glue dispensing groove.

[0009] Preferably, the second lens is in interference fit with the lens barrel to achieve fixation of the second lens and the lens barrel.

[0010] Preferably, the second lens and the lens barrel are further provided with a second fixing glue.

[0011] Preferably, the outer diameter of the second lens is at least 0.5 mm larger than the outer diameter of the first lens.

[0012] Preferably, the effective diameter of the lens closest to the image side is more than twice the effective diameter of the lens closest to the object side.

[0013] Preferably, a light shield is arranged between the first lens and the second lens.

[0014] Preferably, the imaging lens further comprises a third lens arranged on the object side of the first lens and a fourth lens arranged on the image side of the second lens, the outer diameter of the fourth lens is at least 1.1 times the outer diameter of the second lens, and the second lens is fixedly connected to the lens barrel by a second fixing glue. Advantages

[0015] Compared with the related art, the imaging lens provided by the present application comprises a lens barrel and a plurality of lenses accommodated in the lens barrel, the lenses comprise at least a first lens and a second lens arranged in sequence from the object side to the image side, the outer diameter of the second lens is at least 1.1 times the outer diameter of the first lens, and the first lens is fixedly connected to the lens barrel by a first fixing glue. The small lens close to the object side in the two adjacent lenses with large size difference is fixed by the fixing glue, and the large lens close to the image side is fixed by bearing and interference fit, which greatly improves the problem of yield reduction caused by deformation during lens assembly, makes the imaging lens lighter in weight, and is low in cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 is a cross-sectional view of the imaging lens of the present application.

[0017] Fig. 2 is a cross-sectional view of part of the imaging lens of the present application. Best mode of the present application

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0019] The imaging lens is particularly suitable for a small head lens, the head of the small head lens is small in shape, the tail of the small head lens is large in shape, the head is one end of the imaging lens close to the object side, the tail is one end of the imaging lens close to the image side, and the size of the tail is usually twice or more than twice the size of the head, and there is a large difference in the outer diameter between at least two adjacent lenses. The small head lens is commonly used in electronic devices such as mobile phones.

[0020] The utility model provides a kind of imaging lens 100, the imaging lens 100 has opposite setting along optical axis direction object side and image side, as shown in Figure 1 and Figure 2, the imaging lens 100 includes: lens barrel 1 and the multiple lenses 2 received in the lens barrel 1.

[0021] The lens barrel 1 includes annular barrel wall 11 and extension wall 12 formed by bending and extending from one end of the barrel wall 11 close to the object side, and the extension wall 12 surrounds the light hole 13. The barrel wall 11 extends irregularly in the direction from the object side to the image side, and the size gradually increases.

[0022] The lens 2 at least includes first lens 21 and second lens 22 arranged in sequence from object side to image side, the outer diameter of the second lens 22 is at least 1.1 times or more than the outer diameter of the first lens 21, preferably between 1.1 times and 1.3 times. In some application scenarios, for example, in a mobile phone, the outer diameter of the second lens 22 is at least 0.5 mm larger than the outer diameter of the first lens 21. Due to the large size difference between the first lens 21 and the second lens 22, it is easy to deform during assembly, the first lens 21 is fixedly connected with the lens barrel 1 by the first fixing glue 31, that is, the small lens close to the object side in the two adjacent lenses with large size difference, that is, the first lens 21 is fixed by adhesive bonding, which can effectively improve the problem of lens deformation in the assembly process. The second lens 22 is interference fit with the lens barrel 1 to realize the fixation of the second lens 22 and the lens barrel 1, further, the second fixing glue 32 can be arranged between the second lens 22 and the lens barrel 1, so that the second lens 22 is further fixed.

[0023] The first lens 21 includes an image side surface 211 close to the image side, an object side surface 212 close to the object side, and a connecting surface 213 connecting the image side surface 211 and the object side surface 212, and the first fixing glue 31 extends from the image side surface 211 of the first lens 21 to the connecting surface 213 of the first lens 21. The point glue groove 4 is arranged circumferentially along the first lens 21 between the first lens 21 and the lens barrel 1, and the first fixing glue 31 is arranged in the point glue groove 4. The gap between the adjacent first fixing glue 31 can be formed, so that the gap between the adjacent first fixing glue 31 can play a role of air release when the imaging lens 100 is applied in high temperature and high humidity conditions.

[0024] The first lens 21 and the second lens 22 are also provided with a light shield 51. The light shield 51 not only absorbs stray light generated between the first lens 21 and the second lens 22 to improve the imaging quality of the imaging lens 100, but also adjusts the distance between the first lens 21 and the second lens 22.

[0025] In the embodiment, the lens 2 of the imaging lens 100 specifically includes five lenses 2, which are the first lens 21 accommodated in the lens barrel 1, the second lens 22 arranged on the image side of the first lens 21, the third lens 23 arranged on the object side of the first lens 21, the fourth lens 24 arranged on the image side of the second lens 22, and the fifth lens 25 arranged on the object side of the third lens 23. Among the three lenses of the first lens 21, the second lens 22 and the fourth lens 24, the size difference between the adjacent lenses is large, so the first lens 21 and the second lens 22 can be directly fixed by the fixing glue. Specifically, in the embodiment, the first lens 21 and the second lens 22 are fixed by the fixing glue, and the second lens 22 and the fourth lens 24 are fixed to the lens barrel 1 by interference fit. In order to further strengthen the fixing effect, the fourth lens 24, that is, the lens closest to the image side, is further fixed by the third fixing glue 33. The point glue groove accommodating the first fixing glue 31 and the second fixing glue 32 is an annular structure, and the first fixing glue 31 and the second fixing glue 32 are a plurality of fixing glues arranged in the point glue groove, and a gap is arranged between the adjacent fixing glues. The point glue groove accommodating the third fixing glue 33 is a whole circle structure, and the third fixing glue 33 is also a whole circle structure, so that the whole imaging lens 100 has good sealing performance.

[0026] The light shielding sheet 51 is not only arranged between the first lens 21 and the second lens 22, but also can be additionally arranged between any two adjacent lenses except the position between the first lens 21 and the second lens 22, which is determined according to actual needs.

[0027] Among the five lenses 2, the effective diameter of the lens closest to the image side is more than twice the effective diameter of the lens closest to the object side, and preferably, in the present embodiment, the effective diameter of the fourth lens 24 is 2 to 2.5 times the effective diameter of the fifth lens 25.

[0028] Compared with the related art, the imaging lens provided by the utility model, which comprises a lens barrel and a plurality of lenses accommodated in the lens barrel, at least comprises a first lens and a second lens arranged in sequence from the object side to the image side, the outer diameter of the second lens is at least 1.1 times the outer diameter of the first lens, and the first lens is fixedly connected with the lens barrel by a first fixing glue. The imaging lens of the utility model fixes the small lens close to the object side among the two lenses with large size difference by fixing glue, and fixes the large lens close to the image side by bearing and interference fit, greatly improves the yield reduction problem caused by deformation during lens assembly, makes the imaging lens lighter and lower in cost.

[0029] The above is only the embodiment of the utility model, and it should be pointed out that for those skilled in the art, improvements can be made without departing from the creative concept of the utility model, but these all belong to the protection scope of the utility model.

Claims

1. An imaging lens, characterized in that, The imaging lens comprises a lens barrel and a plurality of lenses accommodated in the lens barrel, the lenses at least comprising a first lens and a second lens arranged in sequence from an object side to an image side, an outer diameter of the second lens being at least 1.1 times or more of an outer diameter of the first lens, and the first lens being fixedly connected with the lens barrel by a first fixing glue.

2. The imaging lens according to claim 1, characterized in that, The first lens comprises an image side surface close to the image side, an object side surface close to the object side, and a connecting surface connecting the image side surface and the object side surface, and the first fixing glue extends from the image side surface of the first lens to the connecting surface of the first lens.

3. The imaging lens according to claim 1, characterized in that, A glue dispensing groove is formed between the first lens and the lens barrel and arranged circumferentially around the first lens, and the first fixing glue is arranged in the glue dispensing groove in a plurality of intervals.

4. The imaging lens according to claim 1, characterized in that, The second lens is fixedly connected with the lens barrel by interference fit.

5. The imaging lens according to claim 4, characterized in that, A second fixing glue is further arranged between the second lens and the lens barrel.

6. The imaging lens according to claim 1, characterized in that, The outer diameter of the second lens is at least 0.5 mm larger than the outer diameter of the first lens.

7. The imaging lens according to claim 1, characterized in that, An effective diameter of the lens closest to the image side is more than 2 times of an effective diameter of the lens closest to the object side. 8.The imaging lens according to claim 1, characterized in that, An optical shade is arranged between the first lens and the second lens.

9. The imaging lens according to claim 1, characterized in that, The imaging lens further comprises a third lens arranged on the object side of the first lens and a fourth lens arranged on the image side of the second lens, an outer diameter of the fourth lens being at least 1.1 times or more of an outer diameter of the second lens, and the second lens being fixedly connected with the lens barrel by a second fixing glue.

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