CN113433646B

CN113433646B - Imaging lens and its electronic devices

Info

Publication number: CN113433646B
Application number: CN202010152979.XA
Authority: CN
Inventors: 王丽青; 邹海荣; 吴俊甫
Original assignee: Jiangxi Jingchao Optical Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2025-01-10
Anticipated expiration: 2040-03-06
Also published as: CN113433646A

Abstract

The invention provides an imaging lens, which comprises a lens with a groove, a lens and a compression ring with an extension part. The groove and the extension part are surrounded to form a glue containing groove, a gap exists between the groove and the extension part, and the compression ring, the lens and the lens barrel are surrounded to form a first glue containing space. Glue containing groove and first glue containing space intercommunication for thereby glue can get into first glue containing space from the glue containing groove and the colleague bonds lens cone, lens and clamping ring, and then makes imaging lens's structural stability promote.

Description

Imaging lens and electronic equipment thereof

Technical Field

The invention relates to the field of lenses, in particular to an imaging lens and electronic equipment.

Background

In recent years, portable electronic devices are continuously rising, and ultrathin and high-screen duty ratios have become their standard. To accommodate such development demands, the size of the imaging lens is also approaching miniaturization.

However, in such a trend, the size of the glue containing space of the lens and the contact area with the element are difficult to be ensured, the thrust of the whole imaging lens is too small, and the lens is easy to shift, so that the quality of the product is continuously reduced. The prior art designs a pressing ring with a groove to obtain a larger glue containing space and a corresponding contact area, but the size of the pressing ring is continuously reduced along with the miniaturization of a lens, the structural stability is reduced, a groove is not advisable on the pressing ring, the pressing ring is easy to deform, and the defective rate of a product is increased, so that the pressing ring becomes a problem to be solved urgently.

Disclosure of Invention

The invention provides an imaging lens with a stable structure.

The imaging lens comprises a lens barrel, a lens and a compression ring, wherein the lens and the compression ring are positioned in the lens barrel, and the imaging lens is characterized in that the lens barrel is provided with a groove, the compression ring comprises a main body part and at least one extending part formed on the outer surface of the main body part, the main body part is abutted against the lens, the extending part is positioned in the groove, a first glue containing space is formed by surrounding the main body part, the lens and the lens barrel, the extending part is positioned in the groove and forms a glue containing groove with the groove, the glue containing groove is communicated with the first glue containing space, and the glue is positioned in the glue containing groove and the first glue containing space so as to fix the compression ring, the lens and the lens barrel. The imaging lens has sufficient glue containing space, large contact area between glue and each lens element and high structural strength of each lens element.

Further, the lens barrel includes a first mating surface, the main body portion includes a first outer side surface, the first mating surface and the first outer side surface are both annular surfaces disposed around the axis of the lens barrel, and the first outer side surface is attached to the first mating surface, so as to fix the compression ring and further support against the lens.

Further, the radian corresponding to the total arc length of the first outer side surface and the first matching surface in tight fit is larger than pi, so that the total arc length of the thin part of the lens barrel is reduced.

Further, the main body part and the lens cone form a second glue containing space, the second glue containing space is communicated with the glue containing groove, and the glue is positioned in the second glue containing space, so that glue containing is facilitated.

Further, the groove comprises a groove inner wall, the distance from the groove inner wall to the outermost side of the lens barrel along the axial direction of the perpendicular lens barrel is more than 0.15 millimeter, and the depth of the groove along the axial direction is less than 0.8 millimeter, so that the structural strength of the thinner part of the lens barrel is ensured.

Further, the extension portion comprises a second outer side surface arranged on the outer surface of the extension portion, the second outer side surface and the inner wall of the groove are annular surfaces, and the radius of the second outer side surface is at least 0.02 millimeter smaller than that of the inner wall of the groove, so that sufficient flow channels of glue can be ensured to enter the glue containing groove.

Further, the second outer side surface has a smaller curvature than the inner wall of the groove, so that the extension portion can enter the groove without precise alignment.

Further, the extension portion converges to the outside of the main body portion in the direction perpendicular to the axis, and the groove expands to the inside of the lens barrel in the direction perpendicular to the axis, reducing the accuracy required for the extension portion to enter the groove.

Further, the thickness of the extension part along the axial direction of the lens is larger than 0.1 millimeter, and the width of the extension part along the radial direction is larger than 0.1 millimeter, so that the proper meat thickness is ensured, and burrs are reduced, thereby facilitating molding.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the invention, the drawings that are used in the description of the embodiments will be briefly described below.

FIG. 1 is an exploded perspective view of a preferred embodiment of an imaging lens of the present invention;

Fig. 2 is a perspective view of the lens barrel of fig. 1;

FIG. 2-A is an enlarged view of the portion A of the lens barrel of FIG. 2;

FIG. 3 is a cross-sectional view of the lens barrel of FIG. 2;

FIG. 4 is a schematic perspective view of the first lens of FIG. 1;

FIG. 5 is a cross-sectional view of the first lens of FIG. 4;

FIG. 6 is a schematic perspective view of the compression ring of FIG. 2;

FIG. 6-A is an enlarged view of the portion of the pressure ring A of FIG. 6;

FIG. 7 is a cross-sectional view of the compression ring of FIG. 6;

FIG. 8 is a perspective view of the imaging lens of FIG. 1 assembled;

FIG. 8-A is an enlarged view of a portion A of the perspective view of the imaging lens of FIG. 8;

FIG. 9 is a top view of the imaging lens of FIG. 8;

FIG. 9-A is an enlarged view of a portion A of the imaging lens of FIG. 9;

FIG. 10 is a cross-sectional view of the imaging lens of FIG. 8;

FIG. 10-A is an enlarged view of a section A of the imaging lens of FIG. 10;

FIG. 10-B is an enlarged view of a section A of the imaging lens of FIG. 10;

Detailed Description

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The imaging lens provided by the invention will be specifically explained in this example.

Referring to fig. 1, the present invention provides an imaging lens 100, which includes a lens barrel 10, a lens set 20 and a compression ring 30. The imaging lens 100 can be used in various electronic devices for imaging, such as a mobile phone, a computer, a monitoring device, etc.

Referring to fig. 2 and 3, the lens barrel 10 may be configured as a cylinder, and includes a top wall 11, a side wall 12, and a receiving space 14, where the top wall 11 and the side wall 12 are connected to form the receiving space 14. The lens barrel 10 further includes a groove 13 formed on an inner surface of the side wall 12, and the groove 13 extends from an end of the side wall 12 away from the top wall 11 toward the side wall 11. The top wall 11 may be provided with a light hole 111, where the light hole 111 is connected to the accommodating space 14 and allows light to enter the accommodating space 14, and the axis of the light hole may be the same as that of the lens barrel 10.

In this embodiment, the light hole 111 may be generally provided as one, which may be located at the center of the top wall 11, and the light hole 111 may be a circular hole, and its specific size may be flexibly designed according to practical requirements.

The grooves 13 are arranged in an array around the axis of the lens barrel 10, and in this embodiment, the number of the grooves 13 is 3. In other embodiments, the number of grooves 13 may be 2,4 or more. The groove 13 includes a groove inner wall 131, a groove side wall 132 and a groove bottom wall 133, the groove bottom wall 133 is perpendicular to the optical axis, the groove side wall 132 is connected to two opposite sides of the groove bottom wall 133, and forms a right angle with the groove bottom wall 133, and the groove inner wall 131 is connected to the bottom wall 133 and the groove side wall 132. In another embodiment, the groove sidewall 132 forms an obtuse included angle with the groove bottom wall 133, which is beneficial for glue inflow.

The inner wall of the side wall 12 includes a first inclined wall 121, a second inclined wall 122, a first mating wall 123, a third inclined wall 124, and a second mating wall 125, which are sequentially connected in the axial direction of the lens barrel 10. The first inclined wall 121, the second inclined wall 122 and the third inclined wall 124 are all inclined in the direction of the axis of the lens barrel 10, and the first mating wall 123 and the second mating wall 125 are all disposed parallel to the axis of the lens barrel 10.

Referring to fig. 4 and 5, the lens set 20 at least includes a first lens 21, the first lens 21 including a lens sidewall 211, a lens top wall 212 perpendicular to the lens sidewall 211, and a lens inclined wall 213 connecting the lens sidewall 211 and the lens top wall 212. The lens side wall 211 is parallel to the optical axis of the first lens 21, and the lens inclined wall 213 forms an acute angle with the lens side wall 211 and an obtuse angle with the lens top wall 212. The inclined lens wall 213 is inclined with respect to the top lens wall 212 and the side lens walls 211, which on the one hand facilitates demolding of the first lens 21 and on the other hand facilitates glue inflow during assembly.

Referring to fig. 6 and 7, the pressing ring 30 includes a main body 31 and an extension 32 disposed on the main body 31. The main body 31 is annular and comprises a press ring top surface 311, a first outer side surface 312 perpendicular to the press ring top surface 311, and a press ring bottom surface 313 parallel to the press ring top surface 311. The main body 31 further includes a glue receiving surface 314 that connects the top surface 311 and the first outer side surface 312 in an oblique manner, and a pressing ring inclined surface 315 that extends from the first outer side surface 312 to the bottom surface 313 in an oblique manner.

The extension portion 32 is provided corresponding to the recess 13, and is formed to extend from the outer side surface 312 of the main body 31 in a direction away from the main body 31. The extension 31 includes an extension top surface 321, an extension bottom surface 322, and a second outer side surface 323 connecting the extension top surface 321 and the extension bottom surface 322. The extension 32 further includes an extension side 324, and the extension side 324 is connected to the extension top 321, the extension bottom 322, and the second outer side 323. The first outer side 312 and the second outer side 323 are connected by the extension side 324 and are arranged around the axis of the press ring. In the present embodiment, the number of the extension portions 32 is 3. In other embodiments, the number of extensions 32 may be 2, 4, or more.

Referring to fig. 8-10, when assembling, the lens assembly 20 is mounted in the accommodating space 14, the first lens 21 is farthest from the top wall 11, and the lens side wall 211 is tightly attached to the second mating wall 125, so that the lens assembly 20 is fixed in the lens barrel, and the lens assembly 20 is coaxial with the lens barrel 10.

The extension of the press ring 30 is inserted into the recess and the press ring is slid into the receiving space 14 until the bottom 313 of the press ring abuts against the top wall 212 of the first lens.

During the process of sliding the pressing ring 30 into the accommodating space 14, the pressing ring 30 is guided by the second inclined plane 122, and is matched with the first outer side surface 312 through the first matching surface 123, so as to ensure that the axis of the pressing ring 30 is precisely coincident with the axis of the lens barrel, and is abutted by the lens top wall 212 of the first lens 21, and finally ensure that the pressing ring 30 is precisely positioned at a designated position in the lens barrel 10.

The first mating surface 123 may be tightly mated with the first outer side surface 312, that is, after the press ring 30 is mounted in the accommodating space 14, the lens assembly 20 is fixed by combining the lens barrel 10, so that the lens assembly 20 and the press ring 30 are not offset during the transferring process before the lens 100 is subjected to the dispensing process, thereby increasing the yield. The first mating wall 123 and the lens side wall 211 may be merely mating, which makes the first lens 21 not subject to large stress and thus not easily deformed.

The extension 32 and the groove 13 are surrounded to form a glue groove 40. The glue containing groove 40 includes a first glue containing portion 41, a second glue containing portion 42, and a glue containing gap 43, wherein the glue containing gap 43 is located between the extending portion and the inner wall 131 of the groove, and the first glue containing portion 41 is communicated with the second glue containing portion 42 through the glue containing gap 43. Glue is injected from the first glue receiving portion 41, flows through the glue receiving gap 43 and finally enters the second glue receiving portion 42.

The groove inner wall 131 may be provided as a part annular surface. In the present embodiment, the groove inner wall 131 is provided as a partial annular surface of which the generatrix is parallel to the axis of the lens barrel 10, which helps to maintain a sufficient space between the groove inner wall 131 and the extension 32. In other embodiments, the taper surface may be a part of the taper surface where the bus bar forms an angle with the axis of the lens barrel, so as to facilitate the glue 50 flowing into the glue containing space.

The groove side wall 132 may be configured as a slope that expands the groove 13 toward the inside of the lens barrel 10 in a direction perpendicular to the lens barrel axis, and the groove bottom wall 133 may be configured as a partial annular surface, and a generatrix thereof may be configured perpendicular to the lens barrel 10 axis, so as to facilitate carrying the inflowing glue 50.

The first outer side 312 may be a part of an annular surface parallel to the axis of the lens barrel 10, the radius of the second outer side 323 may be at least 0.02 mm smaller than the radius of the inner wall 131 of the groove, so that the groove 13 and the second outer side 323 are not contacted, the thinner part of the lens barrel 10 is ensured not to be stressed, the distance from the inner wall 131 of the groove to the outermost side of the lens barrel along the direction perpendicular to the axis of the lens barrel is greater than 0.15 mm, the depth of the groove 13 along the direction perpendicular to the axis of the lens barrel is less than 0.8 mm, the forming stability is ensured, the specific size can be set according to the actual requirement, the corresponding radian of the second outer side 323 is smaller than the corresponding radian of the inner wall 131 of the groove, the groove 13 and the extension 32 do not need to be aligned precisely during the assembly process, the assembly difficulty is reduced, the specific size can be set according to the actual requirement, in this embodiment, the extension 32 is positioned in the middle of the groove 13, the extension side 324 is also configured as an inclined plane, the extension 32 converges towards the outer side of the main body 31 along the direction perpendicular to the axis of the lens barrel. For convenience of description, here, a portion of the glue containing space 43 contacting the second outer side 323 is referred to as a first glue containing space 431, and a portion of the remaining glue containing spaces 43 is referred to as a second glue containing space 432.

The number of the grooves 13 and the number of the extending portions 32 should be equal and correspond to each other, the glue containing grooves 40 may be uniformly distributed around the axis of the lens barrel 10, and this arrangement can ensure that the glue 50 can be distributed more uniformly during dispensing. In the present embodiment, the glue grooves 40 are uniformly distributed around the axis of the lens barrel 10 and have a number of 3. In other embodiments, the number of the glue grooves 40 may be 2, 4 or more.

In this embodiment, the recess 13 has the same shape as the extension 32. In other embodiments, the recess 13 and the extension 32 may take different shapes, so long as the extension 32 can be accommodated in the recess 13 and the adhesive-accommodating gap 43 is left.

The lens barrel 10, the first lens 21 and the main body 31 form a first glue containing space 44, and the lens barrel 10 and the main body 31 form a second glue containing space 45. The first glue containing space 44 is communicated with the second glue containing portion 42, and the second glue containing space 45 is communicated with the first glue containing portion 41. Therefore, besides the conventional second glue containing space 45, the glue 50 may enter from the first glue containing portion 41 of the glue containing groove 40, pass through the glue containing gap 43, enter the second glue containing portion 42, and finally enter the first glue containing space 44, so as to greatly increase the contact area between the glue containing space and the glue and each element.

A first adhesive accommodating space 44 is provided between at least one lens of the lens group 20 and the inner surface of the lens barrel 10. In order to improve the imaging performance of the lens module, the lens group 20 may be provided in plurality, and the plurality of lenses 20 may be sequentially stacked from top to bottom along the axial direction of the light-transmitting hole 111.

Referring to fig. 1-10, the pressure ring bevel 315 reduces the occurrence of burrs and burrs.

The thickness of the extending top surface 321 and the extending bottom surface 322 in the axial direction of the lens barrel 10 should be greater than 0.1 mm, so as to ensure the structural stability of the compression ring, and the distance between the extending bottom surface 322 and the groove bottom wall 133 in the axial direction of the lens barrel 10 may be reasonably set according to actual needs, so that the glue flow is convenient.

The first engaging wall 123 may be an annular surface with a generatrix parallel to the axis of the lens barrel, and the total arc length of the first engaging wall 123 engaging with the first outer side 312 corresponds to an arc greater than pi, which ensures excellent deformation resistance of the lens barrel.

The glue containing surface 314 may be an annular surface, specifically, may be a conical surface, and an endpoint of a bus of the conical surface, which is close to the bottom surface 313 of the pressure ring, is closer to the axis of the lens barrel, so that the glue containing amount of the glue containing groove 40 and the first glue containing space 44 is increased, and the processing difficulty of the pressure ring 30 is reduced.

The length from the intersection point of the pressure ring inclined surface 315 and the extended bottom surface 323 to the second outer side surface 322 along the direction perpendicular to the axis of the lens barrel is the width of the extended portion 32, which may be set to be greater than 0.1 mm, so as to ensure sufficient meat thickness to ensure molding stability.

In the imaging lens in the embodiment of the invention, the glue 50 can be conveyed to the first glue containing part 41 through the glue containing groove 40, then enters the second glue containing part 42 from the first glue containing part 41 through the glue containing gap 43 and finally enters the first glue containing space 44, on the other hand, the glue 50 can be directly placed in the second glue containing space 45, and the structural design has the advantages that firstly, the lens barrel 10, the lens 20 and the compression ring 30 can be bonded at the same time, secondly, the contact area between the total glue containing space and the glue and the lens barrel 10, the lens 20 and the compression ring 30 is obviously improved, thirdly, the main stress part main body part 31 of the compression ring 30 is not reduced in deformation resistance, because the size is not reduced, and fourthly, because the thickness of the wall of the lens barrel 10 is larger, the reasonable design of the size of the groove 13 can still ensure the integral structural stability of the lens barrel 10. Therefore, the imaging lens provided by the invention can effectively solve the problem that the structural strength of the element and the glue containing space can not be simultaneously used

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The imaging lens comprises a lens barrel, a lens and a compression ring, wherein the lens and the compression ring are positioned in the lens barrel, and the imaging lens is characterized in that the lens barrel is provided with a groove, the compression ring comprises a main body part and at least one extending part formed on the outer surface of the main body part, the main body part is abutted against the lens, the extending part is positioned in the groove, a first glue containing space is formed by surrounding the main body part, the lens and the lens barrel, the extending part is positioned in the groove and forms a glue containing groove with the groove, the glue containing groove is communicated with the first glue containing space, and the glue is positioned in the glue containing groove and the first glue containing space so as to fix the compression ring, the lens and the lens barrel;

the glue containing groove comprises a glue containing first portion, a glue containing second portion and a glue containing gap, wherein the glue containing gap is positioned between the extending portion and the inner wall of the groove, the glue containing first portion and the glue containing second portion are respectively positioned on two opposite sides of the glue containing gap along the axial direction of the pressing ring, the glue containing first portion and the glue containing second portion are communicated through the glue containing gap, and the glue containing first portion, the glue containing gap and the glue containing second portion are both provided with glue.

2. The imaging lens as claimed in claim 1, wherein the barrel includes a first mating surface, the main body portion includes a first outer side surface, the first mating surface and the first outer side surface are both annular surfaces disposed around an axis of the barrel, and the first outer side surface is attached to the first mating surface.

3. The imaging lens as claimed in claim 2, wherein the first outer side surface has an arc corresponding to a total arc length of a close fit with the first mating surface greater than pi.

4. The imaging lens as claimed in claim 1, wherein the main body portion and the lens barrel form a second glue accommodating space, the second glue accommodating space is communicated with the glue accommodating groove, and the glue is located in the second glue accommodating space.

5. The imaging lens according to claim 1, wherein the groove includes a groove inner wall having a distance from an outermost side of the lens barrel in a direction perpendicular to an axis of the lens barrel of more than 0.15 mm, and a depth of the groove in the axis direction of less than 0.8 mm.

6. The imaging lens as claimed in claim 1, wherein the extension portion includes a second outer side surface disposed on an outer surface of the extension portion, the second outer side surface and the inner wall of the groove are both annular surfaces, and a radius of the second outer side surface is at least 0.02 mm smaller than a radius of the inner wall of the groove.

7. The imaging lens of claim 6, wherein the second outer side has a curvature that is less than a curvature of the inner wall of the recess.

8. The imaging lens according to claim 7, wherein the extension portion converges toward the outside of the main body portion in a direction perpendicular to the axis, and the groove expands toward the inside of the lens barrel in a direction perpendicular to the axis.

9. The imaging lens as claimed in claim 1, wherein a thickness of the extension portion in a lens axis direction is greater than 0.1 mm, and a width of the extension portion in a radial direction is greater than 0.1 mm.

10. An electronic device comprising the imaging lens of any one of claims 1-9.