Optical imaging lens

Abstract

The invention provides an optical imaging lens which comprises a plurality of lenses from an object side to an image side along an optical axis, each lens comprises an object side complete surface facing the object side and an image side complete surface facing the image side, an optical part and an assembly part are formed in the radial direction from inside to outside, and the object side complete surface comprises an object side bearing surface corresponding to the assembly part. The image side surface comprises an image side bearing surface corresponding to the assembling part. An anti-dazzling screen and two activatable glues are arranged between the two lenses. The anti-dazzling screen includes an object side surface facing the object side and an image side surface facing the image side. The activatable glue is annular, one of the activatable glue is arranged between the object side surface of the light shielding sheet and the image side bearing surface of one lens, and the other activatable glue is arranged between the image side surface of the light shielding sheet and the object side bearing surface of the other lens. For each activatable glue, the optical imaging lens satisfies two conditional expressions.

Description

Technical Field

[0001] The invention relates to an optical imaging lens, in particular to an optical imaging lens comprising a light shielding sheet. Background Art

[0002] As the screen-to-body ratio requirements of portable electronic devices continue to increase, the size of optical imaging lenses is required to be smaller and smaller. However, reducing the image height of the lens and the size of the image sensor will affect the image quality such as the resolution of the lens. Therefore, how to reduce the size of the lens without changing the image height is a topic that the industry needs to break through.

[0003] The current technology for reducing the size of a lens is mainly to reduce the outer diameter of the lens by eliminating the interlocking structure of the lens assembly part in the lens, thereby achieving the goal of reducing the outer diameter of the lens, such as: including the outer diameter of the lens head (i.e., the front 1 / 10 area of ​​the lens on the object side). Taking a lens with an image height of 2.52mm as an example, by eliminating the interlocking structure design of the lens assembly part in the lens, the outer diameter of the lens head can be reduced from 3.52mm to 2.6mm.

[0004] Since the limit of reducing the size of the lens by reducing the outer diameter of the lens has been reached, if the lens size is to be further reduced, the only way is to reduce the size of the lens barrel. The existing lens barrel has three main functions, namely 1. Positioning: aligning the lens precisely with the optical axis for assembly, 2. Protection: preventing the lens from being damaged by the outside world and contamination by dust, 3. Shading and aperture: ensuring that light can pass through the entire optical system as designed, avoiding light leakage and stray light. However, the limit of the lens barrel wall thickness is 0.2-0.25mm. If there is no lens barrel in the optical imaging lens, the outer diameter of the lens head can be reduced by another 0.4mm, but the problems of lens assembly, protection and shading caused by the absence of a lens barrel must be overcome.

[0005] Existing non-tube lenses use the technology of heating the entire lens to melt the assembly part of each lens, but the process of heating and melting the assembly part will change the air gap between the lenses and extend the problem of lens eccentricity. Therefore, when developing and producing optical imaging lenses with a smaller head outer diameter, in addition to developing lens assembly, protection and light shielding mechanisms, it is also necessary to overcome the problem of lens positioning not being offset, which is a problem that the industry needs to solve. Summary of the invention

[0006] The present invention provides an optical imaging lens that can be used for shooting images and recording videos, such as: optical imaging lenses for mobile phones, cameras, tablet computers, car lenses, personal digital assistants (PDAs), and augmented reality (AR) or virtual reality (VR) wearable devices. Through the light shielding sheets arranged between multiple lenses and two activatable adhesives respectively arranged on the object side and image side of the light shielding sheets, the lens assembly, positioning, protection and light shielding mechanism are achieved. Preferably, the optical imaging lens of the present invention can provide a good lens assembly, positioning, protection and light shielding mechanism without requiring a lens barrel at least in part, so as to reduce the outer diameter of the head of the optical imaging lens.

[0007] In the disclosure of the present invention, the parameters listed in the following table are used, but are not limited to use only these parameters:

[0008]

[0009]

[0010] According to the optical imaging lens provided by the present invention, the optical imaging lens includes a plurality of lenses along the optical axis from the object side to the image side, each of the lenses includes an object side full surface facing the object side and an image side full surface facing the image side, and an optical portion and an assembly portion formed radially from the inside to the outside, the object side full surface includes an object side bearing surface corresponding to the assembly portion, the image side full surface includes an image side bearing surface corresponding to the assembly portion, and a light shielding sheet and two activatable glues are included between two lenses of the lenses. The light shielding sheet includes an object side surface facing the object side and an image side surface facing the image side. The activatable glues are annular, one of the activatable glues is arranged between the object side surface of the light shielding sheet and the image side bearing surface of one of the two lenses, and the other of the activatable glues is arranged between the image side surface of the light shielding sheet and the object side bearing surface of the other of the two lenses. For each of the activated adhesives, the optical imaging lens satisfies two conditions: 0.05 mm≦Wdsf-Lms≦Ws–Lms and 0.1 mm≦Wdsf≦0.7 mm.

[0011] Furthermore, the above optical imaging lens may also selectively satisfy any of the following conditions:

[0012] 0.03μm≦TG≦31μm;

[0013] 4μm≦TG≦31μm;

[0014] TGmax-TGmin≦3μm;

[0015] TGmax-TGmin≦2μm;

[0016] 1.2≦Has / (TGo+TS / 2)≦1.8;

[0017] 45.6 / (nα)mm 2 ≦π(ODas 2 -IDas 2 )≦572 / (nα)mm 2 ;

[0018] 0.1mm≦Wdsf-Lms≦Ws-Lms-0.1mm;

[0019] 0.1mm≦Lms≦1.2mm;

[0020] 1.9≦ODb / ODh≦2.4;

[0021] 1.2≦ODm / ODh≦1.7;

[0022] 1.9≦TBmax / TBmin≦4.5; and / or

[0023] 0.2mm≦DOB≦1.0mm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of a light shielding sheet and two activatable adhesives and their pre-assembled components according to the first embodiment;

[0025] Figure 2 The figure shows a cross-sectional structure diagram of a component of the first embodiment in which the light shielding sheet and two activated adhesives are pre-assembled;

[0026] Figure 3 It is a schematic structural diagram of a light shielding sheet and two activatable adhesives pre-assembled in the second embodiment;

[0027] Figure 4 It is a cross-sectional structural schematic diagram of a component of a light shielding sheet and two activatable adhesives pre-assembled in the second embodiment;

[0028] Figure 5 It is a schematic structural diagram of a pre-assembled light shielding sheet, two activatable adhesives and adjacent optical elements of the second embodiment;

[0029] Figure 6 FIG. 1 is a schematic cross-sectional structure diagram of adjacent optical elements of Embodiment 2;

[0030] Figure 7 FIG. 1 is a schematic cross-sectional structure diagram of adjacent optical elements of the second embodiment;

[0031] Figure 8 FIG. 1 is a schematic cross-sectional structure diagram of a manufacturing process 1 of an optical imaging lens according to Embodiment 3;

[0032] Fig. 9 FIG. 1 is a schematic cross-sectional structure diagram of a second manufacturing process of the optical imaging lens of the third embodiment;

[0033] Fig.10 FIG. 1 is a schematic cross-sectional structure diagram of a manufacturing process three of the optical imaging lens of the third embodiment;

[0034] Fig.11 FIG. 4 is a schematic cross-sectional structure diagram of a fourth manufacturing process of the optical imaging lens of the third embodiment;

[0035] Fig.12 FIG. 1 is a schematic cross-sectional structure diagram of a manufacturing process five of the optical imaging lens of the third embodiment;

[0036] Fig.13 FIG. 1 is a schematic cross-sectional structure diagram of a sixth manufacturing process of the optical imaging lens of the third embodiment;

[0037] Fig.14 FIG. 1 is a schematic cross-sectional structure diagram of manufacturing process 7 of the optical imaging lens of Embodiment 3;

[0038] Fig.15 FIG. 1 is a schematic cross-sectional structure diagram of manufacturing process eight of the optical imaging lens of Embodiment 3;

[0039] Fig.16 FIG. 1 is a schematic cross-sectional structure diagram of a ninth manufacturing process of the optical imaging lens of the third embodiment;

[0040] Fig.17 FIG. 1 is a schematic cross-sectional structure diagram of manufacturing process 10 of the optical imaging lens of Embodiment 3;

[0041] Fig.18 FIG. 11 is a schematic cross-sectional structure diagram of a manufacturing process 11 of the optical imaging lens of the third embodiment;

[0042] Fig.19 FIG. 1 is a schematic diagram of the cross-sectional structure of the optical imaging lens of the third embodiment;

[0043] Fig. 20 FIG. 4 is a schematic cross-sectional structure diagram of an optical imaging lens according to a fourth embodiment;

[0044] Fig.21 FIG. 4 is a schematic cross-sectional structure diagram of an optical imaging lens according to Embodiment 5;

[0045] Fig. 22 FIG. 4 is a schematic cross-sectional structure diagram of an optical imaging lens according to Embodiment 6;

[0046] Fig.23 FIG. 4 is a schematic cross-sectional structure diagram of an optical imaging lens according to Embodiment 7;

[0047] Fig.24 FIG. 4 is a schematic diagram of the cross-sectional structure of the optical imaging lens of Example 8.

[0048] Reference numerals:

[0049] 1, 2, 32, 33, 34, 35, 36, 37, 42, 43, 44, 45, 46, 52, 53, 54, 55, 56, 57, 62, 63, 64, 65, 66, 67, 72, 73, 74, 75, 76, 77, 101, 102, 103, 104, 105, 106, 107 components;

[0050] 1A, 2A light shielding film; 1B, 1C, 2B, 2C can be activated glue; 2D notch;

[0051] 3, 4, 5, 6, 7, 10 optical imaging lenses;

[0052] 31, 41, 51, 61, 71 lower seats; 38, 47, 58, 68, 78 washers; 39, 48, 59, 69, 79 stoppers;

[0053] 100, 110 lenses; 101 assembly part; 101A image side bearing surface; 101B object side bearing surface; 102 convex arc segment; 103 optical part; 200 protective cover;

[0054] A1 object side; A2 image side; CP1 first center point; CP2 second center point; I optical axis;

[0055] L1 is the first lens; L1A1 is the first lens with full object side; L1A2 is the first lens with full image side;

[0056] L2 second lens; L2A1 second lens object side full; L2A2 second lens image side full;

[0057] L3 third lens; L3A1 third lens object side full; L3A2 third lens image side full;

[0058] L4 fourth lens; L4A1 fourth lens object side full; L4A2 fourth lens image side full;

[0059] L5 fifth lens; L5A1 fifth lens object side full; L5A2 fifth lens image side full;

[0060] L6 sixth lens; L6A1 sixth lens object side full; L6A2 sixth lens image side full;

[0061] Lc chief ray; Lm marginal ray; OB optical boundary. DETAILED DESCRIPTION

[0062] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0063] The optical imaging lens of the present specification includes multiple lenses along the optical axis from the object side to the image side, receiving imaging light incident on the optical imaging lens that is parallel to the optical axis and within a half field of view (HFOV) angle relative to the optical axis, and the imaging light is formed on its imaging surface through the optical imaging lens. The number and shape of the lenses are not limited.

[0064] The optical imaging lens of the present invention is used in a mechanism for lens assembly, positioning, protection and shading, which is assisted by components including at least a light shielding sheet and an activatable glue, so as to at least achieve the effect of reducing the outer diameter of the head of the optical imaging lens. The activatable glue is in the shape of a ring, and preferably the number thereof is approximately twice that of the light shielding sheet. In one embodiment, in order to facilitate the assembly of the optical imaging lens, the light shielding sheet and the activatable glue may be pre-assembled into a component, but the present invention is not limited thereto, and this step may be omitted. In order to illustrate that the present invention can indeed provide a mechanism for lens assembly, positioning, protection and shading, and can preferably be applied in a structure without a lens barrel, so as to reduce the outer diameter of the head of the optical imaging lens, a plurality of embodiments are provided below.

[0065] Embodiment 1

[0066] First, please refer to Figure 1 and Figure 2 ,in Figure 1 FIG. 1 is a schematic diagram of the structure of the light shielding sheet and two activatable adhesives and their pre-assembled components in this embodiment. Figure 2 The figure shows a cross-sectional structure diagram of a pre-assembled assembly of a light shielding sheet and two activatable adhesives in this embodiment.

[0067] The light shielding sheet includes an object side surface facing the object side and an image side surface facing the image side. Here, a light shielding sheet corresponding to two activatable adhesives is set between two optical elements of an optical imaging lens as an example. These two optical elements are called adjacent optical elements. The adjacent optical elements are preferably lenses, but not limited to this. Figure 1 As shown, the optical imaging lens of this embodiment is a component 1 of a pre-assembled light shielding sheet and two activatable adhesives, the component 1 includes an activatable adhesive 1B, a light shielding sheet 1A and another activatable adhesive 1C, the two activatable adhesives 1B and 1C are respectively arranged on the object side and image side of the light shielding sheet 1A. The pre-assembly step is to align the activatable adhesives 1B and 1C with the light shielding sheet 1A, and then adhere and fix them to the light shielding sheet 1A through the adhesive force of the activatable adhesives 1B and 1C.

[0068] In this embodiment, if Figure 2As shown, the two activatable glues 1B and 1C are concentric annular structures with the same outer diameter as the light shielding sheet 1A, but have different widths in the radial direction, so that the two activatable glues 1B and 1C have different inner diameters from the light shielding sheet 1A. In this embodiment, the activatable glues 1B and 1C can be positioned within a predetermined range within the outer diameter of the light shielding sheet 1A. This predetermined range is preferably a radial width of 0.1-0.7 mm, and more preferably a radial width of 0.2-0.7 mm. The material of the activatable glues 1B and 1C can be a material with a certain degree of adhesion, and its adhesion is preferably adjustable and increased, and more preferably activated by a predetermined means to greatly increase its adhesion, so as to be fixedly adhered to the position where it is set. In this embodiment, the materials that can be activated by adhesive 1B and 1C include: pressure sensitive adhesives (PSA) or low-temperature hot melt adhesives (LTR / Low Temperature Cross-linkable structural bonding film, LTC), etc. However, this embodiment is not limited to this, and may also include other materials that can be activated by a predetermined means to have adhesion, good optical properties, thickness accuracy, and are more suitable for assembly. The required thickness accuracy is limited to not producing assembly eccentricity, and the required optical properties are based on the application in optical imaging lenses. Taking pressure sensitive adhesive as an example, its thickness is about 5μm, and its thickness accuracy needs to be less than 1μm. It needs to generate adhesion by applying a pressure of 1-4bar, and the strength of its adhesion is directly affected by the pressure applied to the surface. Taking low-temperature hot melt adhesive as an example, its thickness can optionally include 10μm, 20μm, and 25μm, and it needs to be heated to about 75-110℃, pressure 2-10bar, and time is 10-480 seconds to produce a cross-linking reaction and solidify (Bonding). Please note that the thickness of the conventional double-sided tape is about 30μm. Since its thickness accuracy is about ±10%, it will have assembly eccentricity problems, has high reflectivity and is prone to generate stray light, and is easy to adhere to the assembly equipment during the assembly process. Therefore, it does not meet the requirements here and cannot be used as the activated adhesive 1B, 1C.

[0069] Embodiment 2

[0070] Please also refer to Figure 3 and Figure 4 ,in Figure 3 FIG. 1 is a schematic diagram showing the structure of a pre-assembled assembly of a light shielding sheet and two activatable adhesives in this embodiment. Figure 4 The cross-sectional structure diagram of the light shielding sheet and the two activated adhesives pre-assembled in this embodiment is shown. In order to simplify the text, the differences between this embodiment and the first embodiment are mainly described.

[0071] The activated adhesives 2B and 2C in this embodiment are low-temperature hot melt adhesives. Figure 3 In the illustrated assembly 2, the outer edges of the light shielding sheet 2A and the two activatable adhesives 2B and 2C have corresponding through holes and at least three notches 2D. Here, three notches 2D are taken as an example. These notches 2D each have an arc edge and two short sides, and the arc edge is located between the two short sides. The design of the notches 2D can increase the positioning stability of the light shielding sheet 2A, the activatable adhesives 2B and 2C and the adjacent optical elements, and the details will be described in the following paragraphs. In the pre-assembly step, the activatable adhesives 2B and 2C are aligned with the light shielding sheet 2A so that the notches 2D overlap, and then the activatable adhesives 2B and 2C are adhered to the light shielding sheet 2A to fix them.

[0072] Please refer to Figures 5 to 7 Taking this embodiment as an example, the positional relationship between the light shielding sheet, the activated adhesive and the adjacent optical elements is described, wherein Figure 5 FIG. 1 is a schematic diagram showing the structure of the pre-assembled light shielding sheet, two activated adhesives and adjacent optical elements in this embodiment. Figure 6 FIG. 1 is a schematic diagram of the cross-sectional structure of adjacent optical elements shown in this embodiment. Figure 7 FIG. 4 is a schematic diagram of the cross-sectional structure of adjacent optical elements shown in this embodiment. Figure 5 As shown, the adjacent optical element is exemplified as a lens. Figure 6 An example of adjacent lenses is shown, but the structure and shape of the lens are not limited to this. To define the detailed features of the lens, please refer to Figure 6:The lens 100 forms an optical portion 103 and an assembly portion 101 from the inside to the outside in its radial direction, and also includes an object side full surface 104 of the entire surface facing the object side A1 and an image side full surface 105 of the entire surface facing the image side A2. The center points CP1 and CP2 of the lens surface are the intersection points of the surface and the optical axis I, such as: the center point CP1 is the intersection point of the object side full surface 104 and the optical axis I, and the center point CP2 is the intersection point of the image side full surface 105 and the optical axis I. The optical portion 103 of the lens 100 described above is defined as the corresponding portion of the imaging light passing through a specific range of the lens 100 surface. The imaging light includes at least two types of light: the chief ray Lc and the marginal ray Lm. The assembly portion 101 of the lens 100 described above is defined as the corresponding portion extending radially outward from the optical boundary OB of the lens 100 surface, which is roughly the corresponding portion except the optical portion 103 of the lens 100, so the imaging light does not reach the assembly portion 101. The assembly portion 101 is generally used for assembling the lens 100 to a corresponding element of one of the optical imaging lenses, and the relevant description will be elaborated in detail below. The optical boundary OB of the surface of the lens 100 mentioned above is defined as a point where the edge ray Lm passing through the radially outermost side of the surface of the lens 100 intersects with the surface of the lens 100. The structure and shape of the optical portion 103 are merely examples for illustrating the present invention and are not intended to limit the scope of the present invention. The object side full surface 104 (or the image side full surface 105) of the lens 100 can be divided into different areas according to different positions, such as: the object side full surface 104 includes the object side bearing surface corresponding to the assembly portion 101 (not shown in this example), and the image side full surface 105 includes the image side bearing surface 101A corresponding to the assembly portion 101. In another exemplary embodiment of an adjacent lens, please refer to Figure 7 Of the object side full surface 111 and the image side full surface 112 of the lens 110, the object side full surface 111 only forms the object side bearing surface 101B of the corresponding assembly portion 101. However, the lens of the present invention is not limited thereto, and the object side bearing surface and the image side bearing surface may also exist at the same time.

[0073] Please refer to Figure 6 At least one side of the pre-assembled component 2, such as the object side A1 or the image side A2, is fixedly arranged with the adjacent lens 100, so that the component 2 is bonded to the image side bearing surface 101A or the object side bearing surface of the lens 100, and the image side bearing surface 101A is taken as an example. Figure 5As shown, the assembly portion 101 of the adjacent lens 100 cooperates with the light shielding sheet 2A and each notch 2D of the two activated adhesives 2B and 2C to form at least three raised arc segments 102, so that when the assembly 2 is bonded to the lens 100, each raised arc segment 102 of the lens 100 corresponds to the arc edge and two short sides of each notch 2D, and preferably engages with each other to enhance positioning stability, and more preferably, the light shielding sheet 2A is stably and concentrically arranged with the optical portion 103 of the lens 100. Figure 7 As shown, the adjacent lenses 110 in this example do not have the convex arc segment 102 , but this is not limited to this.

[0074] The shape and size of the convex arc segment 102 are not limited. Here, the radial width of 0.08-0.15 mm and the arc length of 30 degrees based on the lens 100 are taken as an example.

[0075] When the adjacent lens has two pieces, such as Figure 7 As shown, the object side A1 and image side A2 of the pre-assembled component 2 of the light shielding sheet 2A and the two activatable adhesives 2B and 2C are both bonded to an adjacent lens 100, 110, so that the component 2 is bonded between the image side bearing surface 101A of the lens 100 and the object side bearing surface 101B of the lens 110. In detail, one surface-activated adhesive 2C in the component 2 is disposed between the object side surface of the light shielding sheet 2A and the image side bearing surface 101A of the adjacent lens 100, 110 closer to the object side A1, and the other activatable adhesive 2B is disposed between the image side surface of the light shielding sheet 2A and the object side bearing surface 101B of the other adjacent lens 110. In short, the five are arranged in the order of one lens 100, one activatable adhesive 2C, one light shielding sheet 2A, another activatable adhesive 2B, and another adjacent lens 110 from the object side A1 to the image side A2. Through such a configuration, the shading sheet 2A can be set between adjacent lenses 100, 110 to block unnecessary light, and the shading sheet 2A and the lenses 100, 110 are fixed by the activatable glue 2B, 2C, so as to assemble, position and protect the lenses 100, 110, and preferably, the adhesion of the activatable glue 2B, 2C is greatly improved by certain predetermined means until it is fixedly adhered to the position where it is set, so that the shading sheet 2A is stably concentrically set with the optical portion 103 of the lenses 100, 110.

[0076] In order to match the material properties of the low-temperature hot melt adhesive used as the activatable adhesive 2B, 2C in this embodiment, the following measures may be taken: 1) When the component 2 or the activatable adhesive 2B, 2C is disposed on the first adjacent lens 100, an additional pre-lamination heating step may be performed to slightly increase the degree of adhesion between it and the lens 100, and the heating parameters may be, for example, heating at a temperature of 50-60°C and a pressure of 1-5 Pa for 5-20 seconds, but not limited thereto; 2) Since the thickness of the low-temperature hot melt adhesive will be compressed by 20-30% after the pre-adhesion pressurization and heating, it is preferred to compensate for it on its original thickness in advance, such as adjusting the overall original thickness of the component 2 to be thicker than the height of the raised arc segment 102 to compensate for the compression of the low-temperature hot melt adhesive after the pressurization and heating. For example, the overall original thickness of the component 2 may be thicker than the height of the raised arc segment 102 by more than 20%. For example, the thickness of the low-temperature hot melt adhesive may optionally include 10μm, 20μm, and 25μm. Taking 10μm as an example, the thickness of the shading sheet 2A may optionally include 16μm, 18μm, 22μm, 23μm, and 25μm. Taking 16μm as an example, the height of the raised arc segment 102 is set to between 60% and 90% of the original thickness of 36μm of the two low-temperature hot melt adhesives and the shading sheet 2A.

[0077] In the embodiment where the shading sheet and the two activatable adhesives are not pre-assembled, the order and corresponding positions of the lens, the activatable adhesive and the shading sheet can also be arranged according to the above configuration to achieve the above-mentioned mechanism of assembling, positioning and protecting the lens, which will not be repeated here.

[0078] Embodiment 3

[0079] Please refer to this Figures 8 to 19 ,in Figures 8 to 18 FIG. 1 is a schematic diagram of the cross-sectional structure of the optical imaging lens of this embodiment in various manufacturing processes. Fig.19 FIG. 1 is a schematic diagram of the cross-sectional structure of the optical imaging lens of this embodiment. Please note that in this embodiment, a light shielding sheet and two pre-assembled components of activated adhesive are used as an example. Figure 1 or Figure 3 As shown, only a light shielding sheet may be used, but it is not limited to this. Fig.19 As shown, the optical imaging lens 3 in this embodiment is a six-lens optical imaging lens 3 including a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 arranged from the object side A1 to the image side A2, but the present invention is not limited thereto.

[0080] When manufacturing the optical imaging lens 3, the optical components in the lower seat are first assembled. Figure 8As shown in FIG. 1 , a component 36 is provided on the object side of the fifth lens L5, which is referred to as the fifth component 36. Then, the fifth lens L5 is placed in a lower seat 31. Preferably, the assembly portion of the fifth lens L5 is stopped at an inner edge of the lower seat 31 and positioned. In this embodiment, the lower seat 31 is exemplified as a lens barrel. Next, as shown in FIG. Fig. 9 As shown, a spacer 38 is provided on the image side of the fifth lens L5 to set the distance between the fifth lens L5 and the sixth lens L6. Fig.10 As shown, another component 37 is arranged on the object side of the fifth lens L5, which is called the sixth component 37. The sixth lens L6 is placed in the lower seat 31, so that the sixth component 37 is blocked and bonded to the gasket 38 and the sixth lens L6 is blocked by the other inner edge of the lower seat 31 to position and prevent the lens from being eccentric due to various environmental factors. In addition, the sixth component 37 can also use a light shielding sheet that does not have an activated glue. Then, as Fig.11 As shown, a retainer 39 may be optionally provided on the image side of the sixth lens L6 to limit the position of the sixth lens L6. At this time, in the lower seat 31, the fifth lens L5 as a front lens, the gasket 38, the component 37, the sixth lens L6 as a rear lens and the retainer 39 which may be optionally provided are sequentially accommodated from the object side A1 to the image side A2. Next, the overall structure including the lower seat 31 and its internal components is fixed by a heating process, such as: heating to a predetermined temperature and / or pressurizing to a predetermined pressure for a predetermined time by a baking device. The predetermined temperature of heating, the predetermined pressure of pressurization and the predetermined time depend on the material properties of the activatable glue 2B and 2C in the fifth component 36 and the sixth component 37 in the lower seat 31. For example, at least the activatable glue 2B and 2C need to produce stable adhesion. As mentioned above, since the low-temperature hot melt adhesive needs to be heated to about 75°C to produce a cross-linking reaction, the heating temperature here must be at least 75°C, such as: 75-110°C, while the pressure is 5-10 Pa, and the heating time is 10-480 seconds.

[0081] Next, the optical components other than the lower seat 31 of the optical imaging lens 3 are assembled. Figures 12 to 15 As shown, starting from the object side of the fifth lens L5, the components including the light shielding sheet 2A and the two activated adhesives 2B and 2C are alternately stacked with the fourth lens L4, the third lens L3, the second lens L2 and the first lens L1 outside the lower seat 31. In detail, as Fig.12 As shown, the first step is to arrange the fourth lens L4 on the object side of the fifth lens L5, and the fourth lens L4 and the fifth lens L5 are bonded together by a fifth component 36. Another component 35 is arranged on the object side of the fourth lens L4, which is referred to as the fourth component 35. Fig.13As shown, the third lens L3 is disposed on the object side of the fourth lens L4, and the third lens L3 and the fourth lens L4 are bonded together via a fourth component 35. Another component 34 is disposed on the object side of the third lens L3, which is referred to as the third component 34. Fig.14 As shown, the second lens L2 is disposed on the object side of the third lens L3, and the second lens L2 and the third lens L3 are bonded together via a third component 34. Another component 33 is disposed on the object side of the second lens L2, which is referred to as the second component 33. Fig.15 As shown, the first lens L1 is disposed on the object side of the second lens L2, and the first lens L1 and the second lens L2 are bonded together via a second component 33. Another component 32 is disposed on the object side of the first lens L1, which is referred to as the first component 32 herein.

[0082] Next, the step of shielding the sidewalls and the object side of the first lens L1 is performed for the optical elements not accommodated by the lower seat 31. Fig.16 As shown, all optical elements not accommodated by the lower seat 31, including the side walls of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4, are painted black with black ink. The side walls are the side surfaces of the connecting object side and the image side. It is preferred that the entire side wall is completely painted black to prevent light leakage. Fig.17 As shown, a super black shading sheet 310 is disposed outside the first component 32 on the object side of the first lens L1. Preferably, it is a metal shading sheet to solve the light leakage problem at the head of the optical imaging lens 3 and provide a better appearance.

[0083] Then, if Fig.18 As shown, Fig.17 The whole structure is placed in a protective cover 200, and a heating step is performed again, such as using a baking device to heat the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 to fix the black colorant in the black ink, thereby forming a blackened film layer, which can be a black colorant film. Fig.19 The optical imaging lens 3 is shown. In the subsequent transportation or transport process, the optical imaging lens 3 can be preferably placed in the protective cover 200 to protect the optical imaging lens 3.

[0084] In other embodiments, the aforementioned step of shielding the sidewalls of the optical elements not accommodated by the lower seat 31 may also be performed by other means, such as attaching a black film layer to the sidewalls of the optical elements not accommodated by the lower seat 31 or coating them with a black coating by coating means.

[0085] The optical imaging lens 3 manufactured by the above manufacturing process can provide a good lens assembly, positioning, protection and light shielding mechanism without the need for a lens barrel to accommodate at least the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4, because a light shielding sheet 2A with a light shielding effect and activatable glue 2B and 2C that can be fixed in position are disposed between any two lenses of the first lens L1 to the sixth lens L6.

[0086] Secondly, based on experimental data, the optical imaging lens 3 assembled with the light shielding sheet 2A and the activated adhesives 2B and 2C can reduce the outer diameter (diameter) of the head from 2.6 mm to 2.2 mm, with a reduction range of 0-0.4 mm, and can reduce the distance from the object side of the first lens L1 to an imaging surface on the optical axis, that is, the system length of the optical imaging lens, from 3.4 mm to 3.17 mm, with a reduction range of 0-0.23 mm.

[0087] Among them, in the embodiment using pressure-sensitive adhesive as the activatable adhesive, since the adhesion of the pressure-sensitive adhesive can only be generated by applying a pressure of 1-4 Pa, when applied to the optical imaging lens, after each activatable adhesive or a component including the activatable adhesive is set in the optical imaging lens, a pressure application step is required to directly apply pressure to the corresponding activatable adhesive or the component including the activatable adhesive.

[0088] Figures 19 to 24 The cross-sectional structural schematic diagrams of the optical imaging lenses of the third to eighth embodiments of the present invention are shown respectively, and the parameter values ​​of the optical imaging lenses of the third to eighth embodiments are set according to the parameter tables in Table 1 and Table 2 below. The numerical unit is mm. The definitions of the parameters are as described above; they will not be repeated here.

[0089] Table 1: Parameters of optical imaging lenses prepared with pressure-sensitive adhesive as an activated adhesive

[0090]

[0091]

[0092]

[0093] Table 2: Parameters of optical imaging lenses prepared with low-temperature hot melt adhesive as an activated adhesive

[0094]

[0095]

[0096] In one embodiment, for each activatable adhesive, the optical imaging lens can selectively satisfy at least one of the following conditions:

[0097] 0.05mm≦Wdsf-Lms≦Ws–Lms Condition (1);

[0098] 0.1mm≦Wdsf≦0.7mm Condition (2);

[0099] 0.03μm≦TG≦31μm conditional expression (3);

[0100] TGmax-TGmin≦3μm Condition (4);

[0101] 4μm≦TG≦31μm conditional expression (5);

[0102] TGmax-TGmin≦2μm Condition (6);

[0103] 1.2≦Has / (TGo+TS / 2)≦1.8 Conditional formula (7);

[0104] 45.6 / (nα)mm 2 ≦π(ODas 2 -IDas 2 )≦572 / (nα)mm 2 Conditional expression (8);

[0105] 0.1mm≦Wdsf-Lms≦Ws-Lms-0.1mm Conditional formula (9);

[0106] 0.1mm≦Lms≦1.2mm Condition (10);

[0107] 1.9≦ODb / ODh≦2.4 Conditional expression (11);

[0108] 1.9≦TBmax / TBmin≦4.5 conditional expression (12);

[0109] 0.2mm≦DOB≦1.0mm Condition (13);

[0110] 1.2≦ODm / ODh≦1.7 conditional expression (14).

[0111] When the optical imaging lens satisfies both conditional expressions (1) and (2), it is beneficial for the adjacent lenses and the light shielding sheet to be fixed by the activatable adhesive, so as to avoid the adjacent lenses from shifting due to various situations. It is also beneficial for the above-mentioned lenses and the light shielding sheet to be assembled without the need for a lens barrel, so that the lens saves the space of the lens barrel wall thickness and reduces the maximum outer diameter of the optical imaging lens head. The assembly tolerance of the light shielding sheet and the activatable adhesive is about 0.05mm, and the reflectivity of the activatable adhesive is about 4-8%. If the inner edge of the activatable adhesive exceeds the inner edge of the light shielding sheet, it will cause the optical imaging lens to produce serious stray light problems. In order to improve the bonding stability of the light shielding sheet and the lens assembly process, the Wdsf-Lms design reserves an assembly tolerance of 0.05mm. If Wdsf-Lms is less than or equal to Ws-Lms, it will be possible to avoid the inner edge of the activatable adhesive from exceeding the inner edge of the light shielding sheet to reduce the probability of stray light.

[0112] The thickness of the tape generally sold on the market is about 30μm, with an accuracy of ±10%. In other words, its maximum thickness difference is 6μm. If the optical imaging lens meets the conditions (3) and (4), it will not only help shorten the length of the optical imaging lens head, but also avoid the optical imaging lens from being assembled eccentric due to the maximum thickness difference of the assembly adhesive during lens assembly, thereby affecting the imaging quality.

[0113] If the optical imaging lens satisfies conditions (5) and (6), it is advantageous to select pressure-resistant pressure-sensitive adhesive as the activatable adhesive, which is less likely to affect the air gap between adjacent lenses and further reduces the probability of eccentricity during lens assembly. Pressure-sensitive adhesive is inherently sticky, and the nozzle of the assembly equipment can be treated with Teflon or special surface structure to prevent the pressure-sensitive adhesive from sticking to the nozzle and thus reducing the assembly yield of the pressure-sensitive adhesive.

[0114] If the optical imaging lens satisfies condition (7), it is beneficial to design a convex arc segment to fix the air gap between adjacent lenses with a low-temperature hot melt adhesive in a 10%-40% compression space. The optimal limit is 1.4≦Has / (TGo+TS / 2)≦1.6, which is suitable for designing a convex arc segment to fix the air gap between adjacent lenses with a low-temperature hot melt adhesive in a 20%-30% compression space.

[0115] If the optical imaging lens satisfies condition (8), it is beneficial to design the convex arc segment to have enough area to be assembled under the conditions of 62 MPa material yield strength and 0.2-2.5 kg assembly pressure. The preferred limit is 227 / (nα) mm 2 ≦π(ODas 2 -IDas 2 )≦572 / (nα)mm 2 It is suitable for assembly under the conditions of 62 MPa material yield strength and 1-2.5 kg assembly pressure.

[0116] If the optical imaging lens satisfies conditional formula (9), the designed Wdsf-Lms can reserve an assembly tolerance of 0.1mm, which is beneficial to improving the assembly yield of the activatable adhesive and the light shielding sheet, and the light shielding sheet is designed to reserve a 0.1mm annular band from the inner diameter, which is beneficial to shielding stray light near the 0.1mm light hole of the light shielding sheet. The above conditions combined with the restrictions of conditional formula (10) are beneficial to the activatable adhesive and the corresponding object side / image side bearing surface of the adjacent lens to have a better bonding area, and further reduce the probability of avoiding adjacent lens offset. The preferred restriction is 0.1mm≦Lms≦0.3mm, which is beneficial to reducing the size of the adjacent lens and thus shortening the outer diameter of the optical imaging lens.

[0117] If the optical imaging lens satisfies conditional formula (11), it is advantageous to reduce the maximum outer diameter of the optical imaging lens head to less than 45% of ODb.

[0118] If the optical imaging lens satisfies conditional expressions (12) and (13), it is beneficial for the optical imaging lens to reduce the maximum outer diameter of the head while assembling the reciprocal lenses of the optical imaging lens with gaskets when the optical boundaries of the two lenses are greatly different, thereby avoiding a decrease in the lens production yield due to an excessively large thickness ratio of the two lenses. It also makes it easier for the optical imaging lens to be connected to an image sensor, measure various optical imaging qualities, and protect the lens.

[0119] If the optical imaging lens satisfies conditional formula (14), it is advantageous to make the length of the lens of the optical imaging lens not contained in the lens barrel on the optical axis greater than 1.5 mm.

[0120] The contents disclosed in each embodiment of the present invention include but are not limited to optical parameters such as length, thickness, and distance. For example, the present invention discloses an optical parameter A and an optical parameter B in each embodiment, wherein the ranges covered by these optical parameters, the comparison relationship between the optical parameters, and the conditional ranges covered by multiple embodiments are specifically explained as follows:

[0121] (1) The range covered by the optical parameter, for example: α2≦A≦α1 or β2≦B≦β1, α1 is the maximum value of the optical parameter A in multiple embodiments, α2 is the minimum value of the optical parameter A in multiple embodiments, β1 is the maximum value of the optical parameter B in multiple embodiments, and β2 is the minimum value of the optical parameter B in multiple embodiments.

[0122] (2) The comparative relationship between optical parameters, for example: A is greater than B or A is less than B.

[0123] (3) The conditional range covered by multiple embodiments, specifically, the combination relationship or proportional relationship obtained by possible calculation of multiple optical parameters of the same embodiment, these relationships are defined as E. E can be, for example: A+B or AB or A / B or A*B or (A*B) 1 / 2 , and E satisfies the conditional formula E≦γ1 or E≧γ2 or γ2≦E≦γ1, γ1 and γ2 are the values ​​obtained by calculating the optical parameters A and the optical parameters B of the same embodiment, and γ1 is the maximum value among multiple embodiments of the present invention, and γ2 is the minimum value among multiple embodiments of the present invention.

[0124] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum and minimum values ​​of the conditional expressions, as well as the numerical ranges within the maximum and minimum values, are all features that can be implemented by the present invention and are within the scope disclosed by the present invention. The above is only an example and should not be limited thereto.

[0125] In view of the unpredictability of optical system design, under the framework of the present invention, the above-mentioned conditional formula can better enable the optical imaging lens of the present invention to have a good lens assembly, positioning, protection and light shielding mechanism, thereby reducing the outer diameter of the head of the optical imaging lens or improving the assembly yield to improve the shortcomings of the prior art.

[0126] The ranges covered by the above optical parameters, the comparison relationship between the optical parameters, and the maximum value, minimum value, and numerical range within the maximum value and minimum value of the conditional expressions are all features that can be implemented by the present invention, and all belong to the scope disclosed by the present invention. The above is only an example and should not be limited to this.

[0127] All embodiments of the present invention can be implemented, and some feature combinations can be extracted from the same embodiment. Compared with the prior art, the feature combination can also achieve unexpected effects of the present case. The feature combination includes but is not limited to the combination of features such as face shape, refractive index and conditional formula. The disclosure of the implementation mode of the present invention is a specific embodiment to illustrate the principle of the present invention, and the present invention should not be limited to the disclosed embodiment. In other words, the embodiment and its drawings are only for demonstration of the present invention and are not limited thereto.

Claims

1. An optical imaging lens, characterized in that: A plurality of lenses are included along the optical axis from the object side to the image side, each of the plurality of lenses includes an object side full surface facing the object side and an image side full surface facing the image side, and an optical portion and an assembly portion are formed from the inside to the outside in the radial direction, the object side full surface includes an object side bearing surface corresponding to the assembly portion, the image side full surface includes an image side bearing surface corresponding to the assembly portion, and between two lenses of the plurality of lenses includes: a light shielding sheet, the light shielding sheet comprising an object-side surface facing the object side and an image-side surface facing the image side; and Two activatable glues, the two activatable glues are in a ring shape, one of the two activatable glues is disposed between the object side surface of the light shielding sheet and the image side bearing surface of the lens closer to the object side of the two lenses, and the other of the two activatable glues is disposed between the image side surface of the light shielding sheet and the object side bearing surface of the other lens of the two lenses; Among them, for each of the activatable glues, Wdsf is the maximum width of the activatable glue in the radial direction, Lms is the width of the image side bearing surface or the object side bearing surface of the lens bearing against the shading sheet in the radial direction, Ws is the width of the shading sheet in the radial direction, and the optical imaging lens satisfies the two conditional expressions of 0.05mm≦Wdsf-Lms≦Ws–Lms and 0.1mm≦Wdsf≦0.7mm.

2. The optical imaging lens according to claim 1, wherein: For each of the activatable glues, the optical imaging lens further satisfies two conditional expressions: 1.8 μm≦TG≦31 μm and TGmax-TGmin≦3 μm, wherein TG is the thickness of the activatable glue, TGmax is the maximum thickness of the activatable glue, and TGmin is the minimum thickness of the activatable glue.

3. The optical imaging lens according to claim 2, wherein: Each of the activatable adhesives is a pressure-sensitive adhesive and satisfies two conditions: 4 μm≦TG≦31 μm and TGmax-TGmin≦2 μm.

4. The optical imaging lens according to claim 2, wherein: One of the two activatable adhesives is a low-temperature hot melt adhesive, and the outer edge of the light shielding sheet has at least three notches, and the at least three notches respectively have an arc edge and two short sides, and the arc edge is located between the two short sides.

5. The optical imaging lens according to claim 4, wherein: The assembly portion of the lens adjacent to the low-temperature hot-melt adhesive has at least three raised arc segments, wherein each of the raised arc segments corresponds to the arc edge and the two short sides of at least one of the three notches, and satisfies the conditional expression of 1.2≦Has / (TGo+TS / 2)≦1.8, wherein Has is the height of the raised arc segment relative to the object-side supporting surface or the image-side supporting surface, TGo is the thickness of the low-temperature hot-melt adhesive, and TS is the thickness of the shading sheet adjacent to the low-temperature hot-melt adhesive.

6. The optical imaging lens according to claim 5, wherein: The assembly portion of the lens adjacent to the low-temperature hot melt adhesive has at least three convex arc segments, the total number of the convex arc segments is n, wherein each of the convex arc segments corresponds to the arc edge and the two short sides of one of the notches and satisfies 45.6 / (nα)mm 2 ≦π(ODas 2 -IDas 2 )≦572 / (nα)mm 2 The conditional formula is as follows, wherein α is the angle between the two short sides of the convex arc segment, ODas is the outer diameter of the convex arc segment, and IDas is the inner diameter of the convex arc segment.

7. The optical imaging lens according to claim 1, wherein: For each of the activated adhesives, the optical imaging lens further satisfies two conditional expressions: 0.1mm≦Wdsf-Lms≦Ws-Lms-0.1mm and 0.1mm≦Lms≦1.2mm.

8. The optical imaging lens according to claim 1, wherein: The optical imaging lens also includes a lower seat, which is connected to the image sensor and satisfies the condition of 1.9≦ODb / ODh≦2.4, wherein ODb is the maximum outer diameter of the lower seat, and ODh is the maximum outer diameter of the head of the optical imaging lens, wherein the head is the first tenth area of ​​the optical imaging lens starting from the object side.

9. The optical imaging lens according to claim 1, wherein: The optical imaging lens also includes a lower seat, which is a lens barrel. The lens barrel accommodates a front lens, a gasket and a rear lens from the object side to the image side. The gasket is arranged between the front lens and the rear lens, and the optical imaging lens further satisfies two conditional expressions: 1.9≦TBmax / TBmin≦4.5 and 0.2mm≦DOB≦1.0mm, wherein TBmax is the maximum thickness of the front lens from the object side to the image side on the optical axis, TBmin is the minimum thickness of the rear lens from the object side to the image side on the optical axis, and DOB is the maximum distance from the assembly part of the front lens to the assembly part of the rear lens on the optical axis.

10. The optical imaging lens according to claim 9, wherein: The optical imaging lens comprises a first lens, a second lens, a third lens and a fourth lens and satisfies a conditional expression of 1.2≦ODm / ODh≦1.7, ODm is a minimum diameter of a middle sidewall of the optical imaging lens, wherein the middle sidewall is an outer sidewall of the optical imaging lens in another area from the front four-tenths to the front six-tenths of the optical axis from the object side.

11. The optical imaging lens according to claim 9, wherein: At least one of the lenses is accommodated in the lower seat, and the assembly portion of at least one of the lenses not accommodated by the lower seat is covered with a black film layer, which includes any one of the following: a black pigment film, a black film layer, and a black coating film.

Images