Imaging lens and its electronic devices

Abstract

The present invention provides an imaging lens, comprising a lens with a groove, a lens, and a pressure ring with an extension. The groove and the extension form a glue storage groove, there is a gap between the groove and the extension, and the pressure ring, the lens, and the lens barrel form a first glue storage space. The glue storage groove is connected to the first glue storage space, so that glue can enter the first glue storage space from the glue storage groove to bond the lens barrel, the lens, and the pressure ring at the same time, thereby improving the structural stability of the imaging lens.

Description

Technical Field

[0001] The present invention relates to the field of lenses, and in particular to an imaging lens and electronic equipment. Background Art

[0002] In recent years, portable electronic devices have been on the rise, and ultra-thin and high screen-to-body ratio have become their standard. In order to meet such development needs, the size of imaging lenses has also tended to be miniaturized.

[0003] However, under this trend, the size of the lens's adhesive space and the contact area with the components are difficult to guarantee. The thrust of the entire imaging lens is too small, and the lens is easily displaced, causing the product quality to continue to decline. The existing method is to design a pressure ring with a groove to obtain a larger adhesive space and a corresponding contact area. However, the size of the pressure ring itself has been continuously reduced with the miniaturization of the lens, and the structural stability has been reduced. It is not advisable to make grooves on it. Such a pressure ring is very easy to deform, which will still lead to an increase in the defective rate of the product. This has become a problem that needs to be solved urgently. Summary of the invention

[0004] The invention provides an imaging lens with a stable structure.

[0005] An imaging lens comprises a lens barrel, a lens and a pressing ring, wherein the lens and the pressing ring are located in the lens barrel, and is characterized in that: the lens barrel is provided with a groove, the pressing ring comprises a main body and at least one extension formed on the outer surface of the main body, the main body abuts against the lens, the extension is located in the groove, the main body, the lens and the lens barrel are surrounded to form a first glue storage space, the extension is located in the groove and forms a glue storage groove with the groove, the glue storage groove is connected to the first glue storage space, the imaging lens further comprises glue, the glue is located in the glue storage groove and the first glue storage space so as to fix the pressing ring, the lens and the lens barrel. The imaging lens has sufficient glue storage space, a large contact area between the glue and each lens element, and high structural strength of each lens element.

[0006] Furthermore, the lens barrel includes a first mating surface, the main body includes a first outer side surface, the first mating surface and the first outer side surface are both annular surfaces arranged around the axis of the lens barrel, and the first outer side surface is in contact with the first mating surface to fix the pressure ring and then press against the lens.

[0007] Furthermore, the arc corresponding to the total arc length of the tight fit between the first outer side surface and the first matching surface is greater than π, thereby reducing the total arc length of the thinner part of the lens barrel.

[0008] Furthermore, the main body and the lens barrel form a second glue holding space, the second glue holding space is communicated with the glue holding groove, and the glue is located in the second glue holding space for easy glue holding.

[0009] Furthermore, the groove includes an inner wall, the distance from the inner wall to the outermost side of the lens barrel along a direction perpendicular to the axis of the lens barrel is greater than 0.15 mm, and the depth of the groove along the axis direction is less than 0.8 mm, thereby ensuring the structural strength of the thin part of the lens barrel.

[0010] Furthermore, the extension portion includes 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 both annular surfaces, and the radius of the second outer side surface is at least 0.02 mm smaller than the radius of the inner wall of the groove, ensuring that the glue has sufficient flow channel to enter all parts of the glue containing groove.

[0011] Furthermore, the curvature corresponding to the second outer side surface is smaller than the curvature corresponding to the inner wall of the groove, so that the extension portion can enter the groove without precise alignment.

[0012] Furthermore, the extension portion converges toward the outside of the main body portion along a direction perpendicular to the axis, and the groove expands toward the inside of the lens barrel along a direction perpendicular to the axis, thereby reducing the precision required for the extension portion to enter the groove.

[0013] Furthermore, the thickness of the extension portion along the lens axis direction is greater than 0.1 mm, and the width of the extension portion along the radial direction is greater than 0.1 mm, ensuring that the thickness is appropriate to reduce burrs and facilitate molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the invention, the drawings required for describing the embodiments are briefly introduced below.

[0015] Figure 1 is a three-dimensional exploded view of a preferred embodiment of the imaging lens of the present invention;

[0016] Figure 2 yes Figure 1 A three-dimensional schematic diagram of the middle tube;

[0017] Figure 2-A yes Figure 2 A magnified view of the middle tube A;

[0018] Figure 3 yes Figure 2 Cross-section of the middle tube;

[0019] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the first lens;

[0020] Figure 5 yes Figure 4 A cross-sectional view of the first lens;

[0021] Figure 6yes Figure 2 A three-dimensional schematic diagram of the medium pressure ring;

[0022] Figure 6-A yes Figure 6 Enlarged view of the A part of the medium pressure ring;

[0023] Figure 7 yes Figure 6 Cross-section of the medium pressure ring;

[0024] Figure 8 yes Figure 1 A three-dimensional schematic diagram of the middle imaging lens after assembly;

[0025] Figure 8-A yes Figure 8 A magnified view of part A of the stereoscopic schematic diagram of the imaging lens;

[0026] Fig. 9 yes Figure 8 Top view of the center imaging lens;

[0027] Figure 9-A yes Fig. 9 A magnified view of the top view of the imaging lens in the middle, A.

[0028] Fig.10 yes Figure 8 Cross-section of the imaging lens;

[0029] Figure 10-A yes Fig.10 A magnified view of the cross-sectional view of the middle imaging lens at part A;

[0030] Figure 10-B yes Fig.10 A magnified view of the cross-sectional view of the middle imaging lens at part A; DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0033] This example will specifically explain the imaging lens provided by the present invention.

[0034] Please refer to Figure 1 The present invention provides an imaging lens 100, comprising a lens barrel 10, a lens group 20 and a pressure ring 30. The imaging lens 100 can be used in a variety of electronic devices for taking pictures, such as mobile phones, computers, monitoring equipment, etc.

[0035] Please also refer to Figure 2 and Figure 3 The lens barrel 10 may be configured as a cylinder, including a top wall 11, a side wall 12 and a receiving space 14, wherein the top wall 11 is connected to the side wall 12 and together form the receiving space 14. The lens barrel 10 further includes a groove 13 formed on the inner surface of the side wall 12, and the groove 13 extends from one 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-transmitting hole 111, which is connected to the receiving space 14 and allows light to enter the receiving space 14, and the axis of the light-transmitting hole 111 may be the same as that of the lens barrel 10.

[0036] In this embodiment, the light-transmitting hole 111 can generally be set to one, which can be located at the center of the top wall 11, and the light-transmitting hole 111 can be a circular hole, and its specific size can be flexibly designed according to actual needs.

[0037] The grooves 13 are arranged in an array around the axis of the lens barrel 10. In this embodiment, the number of the grooves 13 is 3. In other embodiments, the number of the grooves 13 can 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. The groove inner wall 131 connects the bottom wall 133 and the groove side wall 132. In another embodiment, an obtuse angle is formed between the groove side wall 132 and the groove bottom wall 133, and this angle is conducive to the inflow of glue.

[0038] The inner wall of the side wall 12 includes a first slanted wall 121, a second slanted wall 122, a first matching wall 123, a third slanted wall 124 and a second matching wall 125, and they are sequentially connected along the axis direction of the lens barrel 10. The first slanted wall 121, the second slanted wall 122 and the third slanted wall 124 are all arranged obliquely relative to the axis direction of the lens barrel 10, and the first matching wall 123 and the second matching wall 125 are both arranged parallel to the axis of the lens barrel 10.

[0039] Please also refer to Figure 4 and Figure 5The lens set 20 at least includes a first lens 21. The first lens 21 includes a lens side wall 211, a lens top wall 212 perpendicular to the lens side wall 211, and a lens oblique wall 213 connecting the lens side wall 211 and the lens top wall 212. The lens side wall 211 is parallel to the optical axis of the first lens 21. The lens oblique wall 213 forms an acute angle with the lens side wall 211 and an obtuse angle with the lens top wall 212. The lens oblique wall 213 is inclined relative to the lens top wall 212 and the lens side wall 211, which is conducive to demoulding the first lens 21 on the one hand, and is conducive to the flow of glue during assembly on the other hand.

[0040] Please also refer to Figure 6 and Figure 7 The pressing ring 30 includes a main body 31 and an extension portion 32 located on the main body 31. The main body 31 is annular and includes a pressing ring top surface 311, a first outer side surface 312 perpendicular to the pressing ring top surface 311, and a pressing ring bottom surface 313 parallel to the pressing ring top surface 311. The main body 31 also includes a glue-containing surface 314 obliquely connecting the pressing ring top surface 311 and the first outer side surface 312, and a pressing ring inclined surface 315 obliquely extending from the first outer side surface 312 to the pressing ring bottom surface 313.

[0041] The extension portion 32 is arranged corresponding to the groove 13, and is extended from the outer side surface 312 of the main body 31 to the direction away from the main body 31. The extension portion 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 portion 32 also includes an extension side surface 324, and the extension side surface 324 is connected to the extension top surface 321, the extension bottom surface 322 and the second outer side surface 323. The first outer side surface 312 and the second outer side surface 323 are connected through the extension side surface 324 and are arranged around the axis of the pressure ring. In this embodiment, the number of the extension portions 32 is 3. In other embodiments, the number of the extension portions 32 can be 2, 4 or more.

[0042] Please also refer to Figure 8-10 During assembly, the lens group 20 is installed in the receiving space 14, the first lens 21 is farthest from the top wall 11, and the lens side wall 211 is close to the second matching wall 125, so that the lens group 20 is fixed in the lens barrel, and the lens group 20 is coaxial with the lens barrel 10.

[0043] The extended portion of the pressing ring 30 is inserted into the groove and the pressing ring is slid into the receiving space 14 until the bottom surface 313 of the pressing ring abuts against the top wall 212 of the first lens.

[0044] When the pressure ring 30 slides into the receiving space 14, the pressure ring 30 is first guided by the second inclined surface 122, and cooperates with the first outer surface 312 through the first matching surface 123, to ensure that the axis of the pressure ring 30 is precisely coincident with the axis of the lens barrel, and is supported by the lens top wall 212 of the first lens 21, ultimately ensuring that the pressure ring 30 is accurately positioned at the specified position in the lens barrel 10.

[0045] The first mating surface 123 can be tightly matched with the first outer side surface 312, that is, after the pressure ring 30 is installed in the receiving space 14, it has been combined with the lens barrel 10 to fix the lens group 20, so that the lens group 20 and the pressure ring 30 will not be offset during the transfer process before the lens 100 undergoes the dispensing process, thereby increasing the yield. The first mating wall 123 and the lens side wall 211 can only be matched, so that the first lens 21 will not be subjected to a large stress and is not easily deformed.

[0046] The extension portion 32 and the groove 13 are enclosed to form a glue containing 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. The glue containing gap 43 is located between the extension portion and the inner wall 131 of the groove. The first glue containing portion 41 is connected to the second glue containing portion 42 through the glue containing gap 43. Glue is injected from the first glue containing portion 41, and the glue flows through the glue containing gap 43 and finally enters the second glue containing portion 42.

[0047] The groove inner wall 131 can be set as a partial annular surface. In this embodiment, the groove inner wall 131 is set as a partial annular surface whose generatrix is ​​parallel to the axis of the lens barrel 10, which helps to maintain a sufficient interval between the groove inner wall 131 and the extension 32. In other embodiments, it can also be set as a partial conical surface where the generatrix and the axis of the lens barrel are at an angle, so that the glue 50 can flow into the glue-containing gap.

[0048] The groove side wall 132 can be set as an inclined surface, which allows the groove 13 to expand inwardly of the lens barrel 10 along a direction perpendicular to the lens barrel axis. The groove bottom wall 133 can be set as a partial annular surface, and its generatrix can be set to be perpendicular to the axis of the lens barrel 10 to facilitate carrying the inflowing glue 50.

[0049] The first outer side surface 312 can be set as a partial annular surface whose generatrix is ​​parallel to the axis of the lens barrel 10, and the radius of the second outer side surface 323 can be set to 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 surface 323 are not in contact, ensuring that the thinner part of the lens barrel 10 is not subjected to force, 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, and the depth of the groove 13 along the axis of the lens barrel is less than 0.8 mm, ensuring the stability of the molding, and the specific size can be set according to actual needs; the curvature corresponding to the second outer side surface 323 should be smaller than the curvature corresponding to the inner wall 131 of the groove, such a setting can make the groove 13 and the extension part 32 do not need to be precisely aligned during the assembly process, thereby reducing the difficulty of assembly, and the specific size can be set according to actual needs. In this embodiment, the extension part 32 is located in the middle of the groove 13; the extension side surface 324 can also be set as an inclined surface, which makes the extension part 32 converge to the outer side of the main body 31 along the direction perpendicular to the axis of the lens barrel, and such a setting can be adapted to the shape of the above-mentioned groove 13. For the convenience of description, the portion of the adhesive containing gap 43 in contact with the second outer side surface 323 is referred to as the first adhesive containing gap 431 , and the remaining portion of the adhesive containing gap 43 is referred to as the second adhesive containing gap 432 .

[0050] The number of the grooves 13 and the extensions 32 should be equal and one-to-one corresponding, and the glue-containing grooves 40 can be evenly distributed around the axis of the lens barrel 10. This arrangement can ensure that the glue 50 can be distributed more evenly during the dispensing process. In this embodiment, the glue-containing grooves 40 are evenly distributed around the axis of the lens barrel 10 and the number is 3. In other embodiments, the number of the glue-containing grooves 40 can be 2, 4 or more.

[0051] In this embodiment, the groove 13 and the extension portion 32 have the same shape. In other embodiments, the groove 13 and the extension portion 32 may also have different shapes, as long as the extension portion 32 can be received in the groove 13 and the adhesive space 43 is left.

[0052] The lens barrel 10, the first lens 21 and the main body 31 together form a first glue storage space 44, and the lens barrel 10 and the main body 31 together form a second glue storage space 45. The first glue storage space 44 is connected to the second glue storage part 42, and the second glue storage space 45 is connected to the first glue storage part 41. Therefore, in addition to the conventional second glue storage space 45, the glue 50 can also enter from the first glue storage part 41 of the glue storage groove 40 and enter the second glue storage part 42 through the glue storage gap 43, and finally enter the first glue storage space 44, thereby greatly increasing the contact area between the glue storage space and the glue and each component.

[0053] A first adhesive space 44 is defined between at least one lens in the lens group 20 and the inner surface of the lens barrel 10. 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 stacked in sequence from top to bottom along the axis of the light transmission hole 111.

[0054] Please refer to Figure 1-10 The pressing ring inclined surface 315 reduces the generation of burrs and rough edges.

[0055] The thickness of the extended top surface 321 and the extended 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 pressure ring; the distance between the extended bottom surface 322 and the groove bottom wall 133 in the axial direction of the lens barrel 10 can be reasonably set according to actual needs to facilitate the flow of glue.

[0056] The first matching wall 123 may be an annular surface whose generatrix is ​​parallel to the axis of the lens barrel. The arc corresponding to the total arc length of the first matching wall 123 matching the first outer side surface 312 is greater than π. Such a setting can ensure that the lens barrel has excellent anti-deformation ability.

[0057] The glue holding surface 314 can be set as an annular surface, specifically, can be set as a conical surface, the end point of the generatrix of the conical surface close to the bottom surface 313 of the pressure ring is closer to the axis of the lens barrel. This setting increases the glue holding capacity of the glue holding groove 40 and the first glue holding space 44 on the one hand, and reduces the processing difficulty of the pressure ring 30 on the other hand.

[0058] The length from the intersection of the pressing 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 extension portion 32, and this width can be set to be greater than 0.1 mm to ensure sufficient thickness to ensure molding stability.

[0059] In the imaging lens in the embodiment of the present invention, the glue 50 can be transported to the first glue container part 41 through the glue container groove 40, and then enter the second glue container part 42 from the first glue container part 41 through the glue container gap 43, and finally enter the first glue container space 44. On the other hand, the glue 50 can also be directly placed in the second glue container space 45. Such a structural design has the following advantages: First, it can bond the lens barrel 10, the lens 20 and the pressure ring 30 at the same time; second, the total glue container space and the contact area between the glue and the lens barrel 10, the lens 20 and the pressure ring 30 are significantly improved; third, the deformation resistance of the main body 31, the main force-bearing part of the pressure ring 30, is not weakened because its size has not been reduced; fourth, since the thickness of the wall of the lens barrel 10 is relatively large, the reasonable design of the size of the groove 13 can still ensure the overall structural stability of the lens barrel 10. Therefore, the imaging lens provided by the present invention will effectively solve the problem that the structural strength of the component and the glue container space cannot be achieved at the same time.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. An imaging lens, comprising a lens barrel, a lens and a pressure ring, wherein the lens and the pressure ring are located in the lens barrel, characterized in that: The lens barrel is provided with a groove, the pressing ring comprises a main body and at least one extension formed on the outer surface of the main body, the main body abuts against the lens, the extension is located in the groove, the main body, the lens and the lens barrel are surrounded to form a first glue storage space, the extension is located in the groove and forms a glue storage groove with the groove, the glue storage groove is connected to the first glue storage space, the imaging lens further comprises glue, the glue is located in the glue storage groove and the first glue storage space so as to fix the pressing ring, the lens and the lens barrel; The glue containing groove includes a first glue containing part, a second glue containing part and a glue containing gap, the glue containing gap is located between the extension part and the inner wall of the groove, along the axial direction of the pressure ring, the first glue containing part and the second glue containing part are respectively located on opposite sides of the glue containing gap, the first glue containing part is connected with the second glue containing part through the glue containing gap, and the first glue containing part, the glue containing gap and the second glue containing part all have the glue.

2. The imaging lens according to claim 1, characterized in that: The lens barrel includes a first mating surface, and the main body includes a first outer side surface. Both the first mating surface and the first outer side surface are annular surfaces arranged around the axis of the lens barrel, and the first outer side surface is in contact with the first mating surface.

3. The imaging lens according to claim 2, characterized in that: The arc corresponding to the total arc length of the tight fit between the first outer side surface and the first matching surface is greater than π.

4. The imaging lens according to claim 1, wherein: The main body and the lens barrel form a second glue holding space, the second glue holding space is communicated with the glue holding groove, and the glue is located in the second glue holding space.

5. The imaging lens according to claim 1, wherein: The groove comprises an inner wall of the groove, the distance from the inner wall of the groove to the outermost side of the lens barrel along a direction perpendicular to the axis of the lens barrel is greater than 0.15 mm, and the depth of the groove along the axis direction is less than 0.8 mm.

6. The imaging lens according to claim 1, wherein: The extension portion includes 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 both annular surfaces, and the radius of the second outer side surface is at least 0.02 mm smaller than the radius of the inner wall of the groove.

7. The imaging lens according to claim 6, characterized in that: The curvature corresponding to the second outer side surface is smaller than the curvature corresponding to the inner wall of the groove.

8. The imaging lens according to claim 7, characterized in that: The extension portion converges toward the outer side of the main body portion along a direction perpendicular to the axis, and the groove expands toward the inner side of the lens barrel along a direction perpendicular to the axis.

9. The imaging lens according to claim 1, wherein: The thickness of the extending portion along the lens axis direction is greater than 0.1 mm, and the width of the extending portion along the radial direction is greater than 0.1 mm.

10. An electronic device, characterized in that: The imaging lens comprises the imaging lens according to any one of claims 1 to 9.

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