Imaging lens

Abstract

The utility model provides an imaging lens, which comprises a lens barrel and a plurality of lenses accommodated in the lens barrel, the lenses at least comprise a first lens and a second lens which are sequentially arranged from an object side to an image side, the outer diameter of the second lens is at least 1.1 times and more than 1.1 times of the outer diameter of the first lens, and the outer diameter of the second lens is at least 1.1 times of the outer diameter of the first lens. The first lens is fixedly connected with the lens barrel through the first fixing glue. The imaging lens provided by the utility model is suitable for imaging lenses with large lens size difference, and the lens with small lens size is glued and fixed, so that the problem that the yield is reduced due to deformation during lens assembly is solved, and the imaging lens is lighter in weight and low in cost.

Description

Technical field

[0001] The utility model relates to the technical field of optical imaging, in particular to an imaging lens. [Background Technology]

[0002] Imaging lenses are essential components for electronic devices, such as mobile phones. In some ultra-small imaging lenses, structural limitations result in a small head and a large tail. The head, or the end of the lens barrel, is located near the object side, while the tail, or the end of the lens barrel, is located near the image side. Furthermore, there is a significant difference in outer diameter between at least two adjacent lenses. In existing technology, when there is a significant difference in outer diameter between two adjacent lenses, the two lenses can experience significant misalignment. This can easily cause deformation during assembly, affecting the optical performance of the imaging lens and reducing assembly yield.

[0003] In response to the problems existing in the prior art, there is a related art that adds auxiliary supporting limits to lenses with large deformation to improve the problem of lens deformation. However, this method requires the coordination of the lens barrel, the lens, and the light-shielding plate. The auxiliary supporting limits usually also need to leave a certain gap to cooperate with the supporting structure of the lens barrel, which means that the deformation improvement of the above-mentioned lens can only reduce the deformation to a certain extent, and the implemented structure is relatively complex. In the related art, there is a method of setting the supporting misalignment on a metal spacer with greater strength to improve the situation where the lens is easily deformed. However, when using a metal spacer, on the one hand, the weight of the imaging lens itself will increase, and the cost will increase. On the other hand, the use of a metal spacer also has requirements for the spacing height between the two lenses. When the thickness of the metal spacer is thin, the strength is small. If the assembly misalignment is large enough to a certain extent, the lens will also be deformed, which will also affect and reduce the assembly yield.

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

[0005] The purpose of the utility model is to provide an imaging lens, aiming to solve the problems of large size differences between adjacent lenses in the existing small-head imaging lens, easy deformation during assembly and low yield.

[0006] In order to achieve the above-mentioned objectives, the present invention provides an imaging lens, which includes: a lens barrel and a plurality of lenses housed in the lens barrel, the lenses including 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 being at least 1.1 times or more of the outer diameter of the first lens, and the first lens being fixedly connected to the lens barrel by a first fixing glue.

[0007] Preferably, the first lens includes 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 and arranged along the circumference of the first lens, and the first fixing glue is a plurality of glue dispensing grooves arranged at intervals.

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

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

[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 at least twice the effective diameter of the lens closest to the object side.

[0013] Preferably, a light shielding sheet is provided between the first lens and the second lens.

[0014] Preferably, the imaging lens further includes 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 or more of the outer diameter of the second lens, and the second lens is fixedly connected to the lens barrel by a second fixing glue.

[0015] Compared to related technologies, the present invention provides an imaging lens comprising: a lens barrel and a plurality of lenses housed within the lens barrel, wherein the lenses comprise at least a first lens and a second lens arranged sequentially from the object side to the image side, the outer diameter of the second lens being at least 1.1 times or greater than the outer diameter of the first lens, and the first lens being fixedly connected to the lens barrel via a first fixing adhesive. The present invention significantly improves the yield reduction problem caused by lens deformation during assembly by bonding the small lens closer to the object side of two adjacent lenses with a large size difference with fixing adhesive, and fixing the large lens closer to the image side via a bearing and interference fit, thereby making the imaging lens lighter and less expensive.

Brief Description of the Drawings

[0016] Figure 1 It is a cross-sectional schematic diagram of the imaging lens of the present invention.

[0017] Figure 2 This is a cross-sectional schematic diagram of part of the structure of the imaging lens of the present invention. [Specific implementation method]

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] The imaging lens of this utility model is particularly suitable for use in small-head lenses. These lenses have a small head and a large tail. The head is the end of the imaging lens closest to the object side, while the tail is the end of the imaging lens closest to the image side. The tail size is typically twice or more the size of the head. Furthermore, there is a significant difference in outer diameter between at least two adjacent lenses. These small-head lenses are commonly used in electronic devices such as mobile phones.

[0020] The present invention provides an imaging lens 100, wherein the imaging lens 100 has an object side and an image side arranged opposite to each other along the optical axis. Figure 1 and Figure 2 As shown, the imaging lens 100 includes a lens barrel 1 and a plurality of lenses 2 accommodated in the lens barrel 1 .

[0021] The lens barrel 1 includes an annular barrel wall 11 and an extension wall 12 bent and extended from one end of the barrel wall 11 near the object side, and the extension wall 12 encloses a light hole 13. The barrel wall 11 extends in an irregular step-like shape from the object side to the image side, and its size gradually increases.

[0022] The lens 2 includes at least a first lens 21 and a second lens 22 arranged in sequence from the object side to the image side. The outer diameter of the second lens 22 is at least 1.1 times or more of the outer diameter of the first lens 21, preferably between 1.1 and 1.3 times. In some application scenarios, for example, in mobile phones, 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, they are prone to deformation during assembly. The first lens 21 is fixedly connected to the lens barrel 1 by a first fixing glue 31. That is, the small lens closer to the object side of the two adjacent lenses with a large size difference, that is, the first lens 21, is fixed with a fixing glue, which can effectively improve the problem of lens deformation during assembly. The second lens 22 is interference fit with the lens barrel 1 to achieve the fixation of the second lens 22 to the lens barrel 1. Furthermore, a second fixing glue 32 can be provided between the second lens 22 and the lens barrel 1 to further fix the second lens 22.

[0023] The first lens 21 includes an image-side surface 211 proximal to the image side, an object-side surface 212 proximal to the object side, and a connecting surface 213 connecting the image-side surface 211 and the object-side surface 212. The first fixing adhesive 31 extends from the image-side surface 211 of the first lens 21 to the connecting surface 213 of the first lens 21. A dispensing groove 4 is formed between the first lens 21 and the lens barrel 1 along the circumference of the first lens 21. A plurality of first fixing adhesives 31 are spaced apart in the dispensing groove 4. This arrangement allows gaps to be formed between adjacent first fixing adhesives 31. When the imaging lens 100 is used under high temperature and high humidity conditions, the gas within the imaging lens 100 expands, and the gaps between adjacent first fixing adhesives 31 serve to release the gas.

[0024] A light shielding sheet 51 is provided between the first lens 21 and the second lens 22. The light shielding sheet 51 is used not only to absorb 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 to adjust the distance between the first lens 21 and the second lens 22.

[0025] In this embodiment, the lens 2 of the imaging lens 100 specifically includes five lenses 2: a first lens 21 housed in the lens barrel 1; a second lens 22 disposed on the image side of the first lens 21; a third lens 23 disposed on the object side of the first lens 21; a fourth lens 24 disposed on the image side of the second lens 22; and a fifth lens 25 disposed on the object side of the third lens 23. Among the three lenses, the first lens 21, the second lens 22, and the fourth lens 24, the sizes of adjacent lenses are significantly different. Therefore, the first lens 21 and the second lens 22 can be directly fixed to the lens barrel 1 using adhesive bonding. Specifically, in this embodiment, the first lens 21 and the second lens 22 are preferably fixed using adhesive bonding, while the second lens 22 and the fourth lens 24 are fixed to the lens barrel 1 using an interference fit. To further enhance the fixing effect, the fourth lens 24, i.e., the lens closest to the image side, is further fixed using a third adhesive bonding 33. The dispensing grooves for receiving the first and second adhesives 31, 32 are both annular in structure. Each of the first and second adhesives 31, 32 comprises multiple adhesives disposed within the dispensing grooves, with gaps between adjacent adhesives. The dispensing groove for receiving the third adhesive 33 is a full circle, and the third adhesive 33 is also a full circle, thus ensuring good sealing of the entire imaging lens 100.

[0026] The light shielding sheet 51 is not only disposed between the first lens 21 and the second lens 22 , but can also be disposed between any other two adjacent lenses, depending on 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. Preferably, in this 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 to related technologies, the present invention provides an imaging lens comprising: a lens barrel and a plurality of lenses housed within the lens barrel, wherein the lenses comprise at least a first lens and a second lens arranged sequentially from the object side to the image side, wherein 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 via a first fixing adhesive. The present invention significantly improves the yield reduction problem caused by lens deformation during assembly by bonding the small lens near the object side of two adjacent lenses with a large size difference with fixing adhesive, and fixing the large lens near the image side via a bearing and interference fit, thereby making the imaging lens lighter and less expensive.

[0029] The above is only an embodiment of the present invention. It should be pointed out that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the scope of protection of the present invention.

Claims

1. An imaging lens, characterized in that: The imaging lens includes: a lens barrel and a plurality of lenses housed in the lens barrel, wherein the lenses include at least a first lens and a second lens arranged in sequence from the object side to the image side, wherein the outer diameter of the second lens is at least 1.1 times or greater than the outer diameter of the first lens, and the first lens is fixedly connected to the lens barrel by a first fixing glue.

2. The imaging lens according to claim 1, wherein: The first lens includes 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. 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, wherein: A glue dispensing groove is formed between the first lens and the lens barrel and is arranged along the circumference of the first lens. The first fixing glue is arranged in a plurality of intervals in the glue dispensing groove.

4. The imaging lens according to claim 1, wherein: The second lens is interference-fitted with the lens barrel to achieve fixation of the second lens and the lens barrel.

5. The imaging lens according to claim 4, wherein: A second fixing glue is further provided between the second lens and the lens barrel.

6. The imaging lens according to claim 1, wherein: 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, wherein: The effective diameter of the lens closest to the image side is at least twice the effective diameter of the lens closest to the object side.

8. The imaging lens according to claim 1, wherein: A light shielding sheet is provided between the first lens and the second lens.

9. The imaging lens according to claim 1, wherein: The imaging lens further includes a third lens disposed on the object side of the first lens and a fourth lens disposed on the image side of the second lens. The outer diameter of the fourth lens is at least 1.1 times or greater than the outer diameter of the second lens. The second lens is fixedly connected to the lens barrel via a second fixing glue.

Images