Imaging lens group

Abstract

The invention discloses an imaging lens group, which comprises a diaphragm, and sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side, a second lens element; a third lens element; a fourth lens element; a fifth lens element; and a sixth lens element. Wherein the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the imaging lens group is f, the maximum visual angle of the imaging lens group is FOV, the maximum optical effective radius of the object side surface of the first lens is CA1, and the following conditions are satisfied: 702.32 mm * degree lt; tL * (f * FOV) / CA1) lt; and the thickness is 1286.23 mm * degree. Therefore, the height and the imaging picture proportion of the imaging lens group under a large picture angle are relatively proper, and the balance of the imaging quality and the size of the imaging lens group is facilitated.

Description

Technical Field

[0001] The invention relates to an imaging lens set, and in particular to an imaging lens set applied to an electronic device. Background Art

[0002] Currently, ultra-wide-angle lenses are widely used in various scientific and technological fields to meet diverse needs, including photography, monitoring, automation equipment, and vehicle surround systems. However, previous Internet of Things (IoT) ultra-wide-angle lens technology has serious problems, which seriously restricts its application scope. Previous Internet of Things (IoT) ultra-wide-angle lenses are usually accompanied by high lens heights, which is intolerable for many special applications and IoT devices in limited spaces. The high lens height limits the physical configuration of the device and makes many applications impossible to implement or severely restricts their operation.

[0003] In addition, previous IoT ultra-wide-angle lenses require large optical components and complex lens layouts to maintain high-quality imaging, which not only increases manufacturing costs, but also increases system complexity, making design and integration difficult. This situation seriously hinders the popularization and practical application of IoT ultra-wide-angle lenses, especially in resource-limited application environments. In short, previous IoT ultra-wide-angle lens technology has fundamental problems in terms of performance, cost and feasibility, which are urgent problems to be solved in this technical field. Summary of the invention

[0004] The object of the present invention is to solve the problems of the above-mentioned prior art. To achieve the above-mentioned object, the present invention provides an imaging lens group, including a light barrier, and including, from the object side to the image side, in order: a first lens having negative refractive power, the object side surface of the first lens being convex near the optical axis; a second lens having positive refractive power; a third lens having positive refractive power; a fourth lens having negative refractive power; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, the image side surface of the sixth lens being concave near the optical axis.

[0005] Among them, the total number of refractive lenses in the imaging lens group is six. The distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the imaging lens group is f, the maximum viewing angle of the imaging lens group is FOV, the maximum optical effective radius of the object side surface of the first lens is CA1, the maximum optical effective radius of the image side surface of the sixth lens is CA12, the angle at which the chief ray of the maximum viewing angle of the imaging lens group enters the imaging surface is CRA, the maximum imaging height of the imaging lens group is IMH, the distance from the image side surface of the sixth lens to the imaging surface on the optical axis is BFL, the displacement parallel to the optical axis from the intersection point of the image side surface of the sixth lens on the optical axis to the position of the maximum effective radius of the image side surface of the sixth lens is TDP12, the entrance pupil diameter of the imaging lens group is EPD, the maximum optical effective radius of the image side surface of the first lens is CA2, the radius of curvature of the image side surface of the first lens is R2, the focal length of the third lens is f3, the focal length of the fifth lens is f5, the distance from the aperture stop to the imaging surface on the optical axis is SL, and at least one of the following conditions is satisfied:

[0006] 702.32 (mm·deg) < TL * (f * FOV) / CA1 < 1286.23 (mm·deg);

[0007] 26.85 (deg) < (CA1 / CA12) * CRA < 53.06 (deg);

[0008] 34.51 (deg) < (IMH / CA12) * CRA < 58.29 (deg);

[0009] 51.3 (deg) < ATAN((BFL - TDP12) / (IMH - CA12)) < 85.83 (deg);

[0010] 30.55 (deg) < (IMH / CA1) * CRA < 58.19 (deg);

[0011] 12.42 (mm) < TL * CA1 / EPD < 26.15 (mm);

[0012] 21.84 (mm) < TL * (FOV / CRA) < 38.12 (mm);

[0013] 101.34 (deg) < (TL * CRA) / f < 175.96 (deg);

[0014] 6.85 (mm) < TL * (IMH / f) < 11.55 (mm);

[0015] 1.65 (mm) < TL * EPD / IMH < 2.76 (mm);

[0016] 1.33 < (2 * CA2) / R2 < 2.27;

[0017] 2.12 < (CA1 / CA12) * (TL / IMH) < 4.10;

[0018] 12.72 (mm) < TL * (f3 + f5) / f < 25.74 (mm);

[0019] 1.62 (mm -1 ) < (TL / IMH) / R2 < 2.75 (mm -1 );

[0020] 12.9 (mm) < TL * SL / f < 21.33 (mm).

[0021] When the above imaging lens group satisfies 702.32 (mm * degree) < TL * (f * FOV) / CA1) < 1286.23 (mm * degree), the height and imaging picture ratio of the imaging lens group under a large picture angle are more appropriate, and it is beneficial to balance the imaging quality and the size of the imaging lens group.

[0022] When 26.85 (degree) < (CA1 / CA12) * CRA < 53.06 (degree) is satisfied, the configuration of the smaller lens outer diameter of the imaging lens group is more suitable to achieve the effect of miniaturization.

[0023] When 34.51 (degree) < (IMH / CA12) * CRA < 58.29 (degree) is satisfied, the configuration of the smaller lens outer diameter of the imaging lens group is more suitable to achieve the effect of miniaturization.

[0024] When 51.3 (degree) < ATAN((BFL - TDP12) / (IMH - CA12)) < 85.83 (degree) is satisfied, the configuration of the smaller lens outer diameter of the imaging lens group is more suitable to achieve the effect of miniaturization.

[0025] When 30.55 (degree) < (IMH / CA1) * CRA < 58.19 (degree) is satisfied, the configuration of the smaller lens outer diameter of the imaging lens group is more suitable, thereby achieving a miniaturized imaging lens group and satisfying the effect of ultra-wide angle.

[0026] When 12.42 (mm) < TL * CA1 / EPD < 26.15 (mm) is satisfied, the imaging lens group has a larger light input amount and better imaging quality, and the formability of the imaging lens group can reach the best balance for miniaturization.

[0027] When 21.84 (mm) < TL * (FOV / CRA) < 38.12 (mm), the height and imaging size ratio of the imaging lens group under a large angle of view are made more appropriate, which is beneficial to balancing the imaging quality and the size of the imaging lens group.

[0028] When 101.34 (degrees) < (TL * CRA) / f < 175.96 (degrees), the imaging lens group can maintain better imaging quality under the spatial configuration of a shorter lens group height.

[0029] When 6.85 (mm) < TL * (IMH / f) < 11.55 (mm), the height and imaging picture ratio of the imaging lens group under a large angle of view are made more appropriate, which is beneficial to balancing the imaging quality and the size of the imaging lens group.

[0030] When 1.65 (mm) < TL * EPD / IMH < 2.76 (mm), the imaging lens group has better imaging quality and light input amount, and the height configuration of the imaging lens group can reach the best balance.

[0031] When 1.33 < (2 * CA2) / R2 < 2.27, the height and imaging picture ratio of the imaging lens group under a large angle of view are made more appropriate, which is beneficial to balancing the imaging quality and the size of the imaging lens group.

[0032] When 2.12 < (CA1 / CA12) * (TL / IMH) < 4.10, the configuration of the smaller lens outer diameter of the imaging lens group is more suitable to achieve the effect of miniaturization.

[0033] When 12.72 (mm) < TL * (f3 + f5) / f < 25.74 (mm), the height and imaging size ratio of the imaging lens group under a large angle of view are made more appropriate, which is beneficial to balancing the imaging quality and the size of the imaging lens group.

[0034] When 1.62 (mm -1 ) < (TL / IMH) / R2 < 2.75 (mm -1 )), the imaging lens group can maintain better imaging quality under the spatial configuration of a shorter lens group height.

[0035] When 12.9 (mm) < TL * SL / f < 21.33 (mm), the imaging lens group can maintain better imaging quality under the spatial configuration of a shorter lens group height. Brief Description of the Drawings

[0036] Figure 1A It is a schematic diagram of the imaging lens group of the first embodiment of the present invention.

[0037] Figure 1B From left to right are the field curvature and distortion curves of the imaging lens assembly of the first embodiment.

[0038] Figure 2A FIG. 4 is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention.

[0039] Figure 2B From left to right are the field curvature and distortion curves of the imaging lens assembly of the second embodiment.

[0040] Figure 3A FIG. 4 is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention.

[0041] Figure 3B From left to right are the field curvature and distortion curves of the imaging lens assembly of the third embodiment.

[0042] Figure 4A FIG. 4 is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention.

[0043] Figure 4B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fourth embodiment.

[0044] Figure 5A FIG. 4 is a schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention.

[0045] Figure 5B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fifth embodiment.

[0046] Fig. 6A FIG. 4 is a schematic diagram of an imaging lens assembly according to a sixth embodiment of the present invention.

[0047] Figure 6B From left to right are the field curvature and distortion curves of the imaging lens assembly of the sixth embodiment.

[0048] 100, 200, 300, 400, 500, 600: light bar;

[0049] 110, 210, 310, 410, 510, 610: first lens;

[0050] 111, 211, 311, 411, 511, 611: object side surface;

[0051] 112, 212, 312, 412, 512, 612: image side surface;

[0052] 120, 220, 320, 420, 520, 620: second lens;

[0053] 121, 221, 321, 421, 521, 621: object side surface;

[0054] 122, 222, 322, 422, 522, 622: image side surface;

[0055] 130, 230, 330, 430, 530, 630: third lens;

[0056] 131, 231, 331, 431, 531, 631: object side surface;

[0057] 132, 232, 332, 432, 532, 632: image side surface;

[0058] 140, 240, 340, 440, 540, 640: fourth lens;

[0059] 141, 241, 341, 441, 541, 641: object side surface;

[0060] 142, 242, 342, 442, 542, 642: image side surface;

[0061] 150, 250, 350, 450, 550, 650: fifth lens;

[0062] 151, 251, 351, 451, 551, 651: object side surface;

[0063] 152, 252, 352, 452, 552, 652: image side surface;

[0064] 160, 260, 360, 460, 560, 660: sixth lens;

[0065] 161, 261, 361, 461, 561, 661: object side surface;

[0066] 162, 262, 362, 462, 562, 662: image side surface;

[0067] 170, 270, 370, 470, 570, 670: infrared filter; 180, 280, 380, 480, 580, 680: imaging surface;

[0068] 190, 290, 390, 490, 590, 690: optical axis;

[0069] f: overall focal length of the imaging lens group;

[0070] f3: focal length of the third lens;

[0071] f5: focal length of the fifth lens;

[0072] Fno: aperture value of the imaging lens group;

[0073] FOV: the maximum viewing angle of the imaging lens group;

[0074] TL: the distance from the object side surface of the first lens to the imaging plane on the optical axis;

[0075] CA1: The maximum optical effective radius of the object side surface of the first lens;

[0076] CA2: the maximum optical effective radius of the image-side surface of the first lens; CA12: the maximum optical effective radius of the image-side surface of the sixth lens;

[0077] CRA: The angle of the principal ray incident on the imaging surface with the maximum viewing angle of the imaging lens group;

[0078] IMH: Maximum imaging height of the imaging lens group;

[0079] EPD: entrance pupil diameter of the imaging lens group;

[0080] BFL: the distance from the image side surface of the sixth lens to the imaging plane on the optical axis;

[0081] TDP12: displacement parallel to the optical axis from the intersection of the image-side surface of the sixth lens on the optical axis to the maximum effective radius position of the image-side surface of the sixth lens;

[0082] R2: the radius of curvature of the image side surface of the first lens;

[0083] SL: The distance from the aperture to the imaging surface on the optical axis. DETAILED DESCRIPTION

[0084] In order to enable those with ordinary knowledge in the relevant technical field to understand the content of the present invention and to implement the content of the present invention, the following is an appropriate embodiment with illustrations for explanation. Equivalent replacements and modifications based on the content of the present invention are all included in the scope of rights of the present invention. In addition, it is stated that the illustrations attached to the present invention are not depicted according to actual dimensions. Although the present invention provides embodiments of specific parameters, it should be understood that the parameters do not need to be completely equal to the corresponding values. Within an acceptable error range, they are approximate to the corresponding parameters. The following implementation methods will further explain the technical content of the present invention in detail, but the disclosed content is not used to limit the scope of rights of the present invention.

[0085] <First Embodiment>

[0086] Please refer to Figure 1A and Figure 1B ,in, Figure 1A is a schematic diagram of an imaging lens assembly according to a first embodiment of the present invention, Figure 1BFrom left to right are the field curvature and distortion curves of the imaging lens assembly of the first embodiment. Figure 1A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 110, a second lens 120, a light barrier 100, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, an infrared cut filter 170, and an imaging surface 180; wherein the imaging lens group has six lenses with refractive power.

[0087] The first lens 110 has negative refractive power and is made of glass. Its object-side surface 111 is convex near the optical axis 190 , and its image-side surface 112 is concave near the optical axis 190 . Both the object-side surface 111 and the image-side surface 112 are spherical.

[0088] The second lens 120 has positive refractive power and is made of plastic. Its object-side surface 121 is concave near the optical axis 190 , and its image-side surface 122 is convex near the optical axis 190 . Both the object-side surface 121 and the image-side surface 122 are aspherical.

[0089] The third lens 130 has positive refractive power and is made of plastic. Its object-side surface 131 is convex near the optical axis 190 , and its image-side surface 132 is convex near the optical axis 190 . Both the object-side surface 131 and the image-side surface 132 are aspherical.

[0090] The fourth lens 140 has negative refractive power and is made of plastic. Its object-side surface 141 is convex near the optical axis 190 , and its image-side surface 142 is concave near the optical axis 190 . Both the object-side surface 141 and the image-side surface 142 are aspherical.

[0091] The fifth lens 150 has positive refractive power and is made of plastic. Its object-side surface 151 is convex near the optical axis 190 , and its image-side surface 152 is convex near the optical axis 190 . Both the object-side surface 151 and the image-side surface 152 are aspherical.

[0092] The sixth lens 160 has negative refractive power and is made of plastic. Its object-side surface 161 is concave near the optical axis 190 , and its image-side surface 162 is concave near the optical axis 190 . Both the object-side surface 161 and the image-side surface 162 are aspherical.

[0093] The infrared cut filter 170 (IR-cut filter) is made of glass, which is arranged between the sixth lens 160 and the imaging surface 180 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 170 component can also be formed on the lens surface, and the infrared cut filter 170 can also be made of other materials.

[0094] The curve equations of the aspheric surfaces of the above lenses are expressed as follows:

[0095]

[0096] Wherein, z is the position value at a height of h along the optical axis 190 with the surface vertex as a reference; c is the curvature of the lens surface close to the optical axis 190, and is the inverse of the radius of curvature (R) (c=1 / R), R is the radius of curvature of the lens surface close to the optical axis 190, h is the vertical distance between the lens surface and the optical axis 190, k is the conic constant, and Ai is the i-th order aspheric coefficient.

[0097] In the first embodiment, the overall focal length of the imaging lens group is f, the aperture value (f-number) of the imaging lens group is Fno, and the maximum viewing angle of the imaging lens group is FOV, whose values ​​are as follows: f=1.78 (mm); Fno=2.44; and FOV=158.30 (degrees).

[0098] In the imaging lens group of the first embodiment, the distance from the object-side surface 111 of the first lens 110 to the imaging plane 180 on the optical axis 190 is TL, the overall focal length of the imaging lens group is f, the maximum viewing angle of the imaging lens group is FOV, the maximum optical effective radius of the object-side surface 111 of the first lens 110 is CA1, and the following condition is satisfied: TL*(f*FOV) / CA1)=885.32 (millimeter*degree).

[0099] In the imaging lens group of the first embodiment, the maximum optical effective radius of the image-side surface 162 of the sixth lens 160 is CA12, the angle of the maximum viewing angle of the main light of the imaging lens group incident on the imaging surface is CRA, and satisfies the following condition: (CA1 / CA12)*CRA=40.41 (degrees).

[0100] In the imaging lens group of the first embodiment, the maximum imaging height of the imaging lens group is IMH, the maximum optical effective radius of the image side surface 162 of the sixth lens 160 is CA12, the angle of the maximum viewing angle of the main light of the imaging lens group incident on the imaging plane is CRA, and the following condition is satisfied: (IMH / CA12)*CRA=44.36 (degrees).

[0101] In the imaging lens group of the first embodiment, the distance from the image side surface 162 of the sixth lens 160 to the imaging plane 180 on the optical axis 190 is BFL, the displacement parallel to the optical axis 190 from the intersection of the image side surface 162 of the sixth lens 160 on the optical axis 190 to the maximum effective radius position of the image side surface 162 of the sixth lens 160 is TDP12, the maximum imaging height of the imaging lens group is IMH, the maximum optical effective radius of the image side surface 162 of the sixth lens 160 is CA12, and the following condition is satisfied: ATAN((BFL-TDP12) / (IMH-CA12))=65.25 (degrees).

[0102] In the imaging lens group of the first embodiment, the maximum imaging height of the imaging lens group is IMH, the angle of the maximum viewing angle of the imaging lens group at which the principal ray is incident on the imaging surface is CRA, and the following condition is satisfied: (IMH / CA1)*CRA=38.19 (degrees).

[0103] In the imaging lens assembly of the first embodiment, the entrance pupil diameter of the imaging lens assembly is EPD, and satisfies the following condition: TL*CA1 / EPD=21.30 (mm).

[0104] In the imaging lens assembly of the first embodiment, the angle of the maximum viewing angle of the imaging lens assembly at which the principal ray is incident on the imaging surface is CRA, and satisfies the following condition: TL*(FOV / CRA)=31.77 (mm).

[0105] In the imaging lens assembly of the first embodiment, the following condition is satisfied: (TL*CRA) / f=136.66 (degrees).

[0106] In the imaging lens assembly of the first embodiment, the maximum imaging height of the imaging lens assembly is IMH, and satisfies the following condition: TL*(IMH / f)=9.56 (mm).

[0107] In the imaging lens assembly of the first embodiment, the entrance pupil diameter of the imaging lens assembly is EPD, and satisfies the following condition: TL*EPD / IMH=2.08 (mm).

[0108] In the imaging lens assembly of the first embodiment, the maximum optical effective radius of the image-side surface 112 of the first lens 110 is CA2, the curvature radius of the image-side surface 112 of the first lens 110 is R2, and the following condition is satisfied: (2*CA2) / R2=1.89.

[0109] In the imaging lens set of the first embodiment, the maximum optical effective radius of the image-side surface 162 of the sixth lens 160 is CA12, the maximum imaging height of the imaging lens set is IMH, and the following condition is satisfied: (CA1 / CA12)*(TL / IMH)=3.33.

[0110] In the imaging lens assembly of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fifth lens 150 is f5, and the following condition is satisfied: TL*(f3+f5) / f=21.04 (mm).

[0111] In the imaging lens set of the first embodiment, the maximum imaging height of the imaging lens set is IMH, the curvature radius of the image side surface 112 of the first lens 110 is R2, and the following conditions are satisfied: (TL / IMH) / R2=2.29 (mm) -1 ).

[0112] In the imaging lens assembly of the first embodiment, the distance between the light stop 100 and the imaging surface 180 on the optical axis 190 is SL, and satisfies the following condition: TL*SL / f=17.11 (mm).

[0113] Please refer to Table 1 and Table 2 below.

[0114]

[0115]

[0116]

[0117]

[0118] Table 1 Figure 1AThe first embodiment has detailed structural data, wherein the units of the curvature radius, thickness, gap and focal length are mm, and surfaces 0-16 represent surfaces from the object side to the image side in sequence, surface 5 is the gap between the light bar 100 and the object side surface 131 of the third lens 130 on the optical axis 190, and the light bar 100 is closer to the object side than the object side surface 131 of the third lens 130, so it is represented by a positive value, on the contrary, if the object side surface 131 of the third lens 130 is closer to the object side than the light bar 100, it is represented by a negative value; surfaces 1, 3, 6, 8, 10, 12, and 14 are the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, the sixth lens 160, the infrared filter 160, the infrared filter 161, the infrared filter 162, the infrared filter 163, the infrared filter 164, the infrared filter 165, the infrared filter 166, the infrared filter 167, the infrared filter 168, the infrared filter 169 ...9, the infrared filter 169, the infrared filter 160, the infrared filter 161, the infrared filter 164, the infrared filter 165, the infrared filter 166, the infrared filter 167, the infrared filter 168, the infrared filter 169, the infrared filter 169, the infrared filter 169, the infrared filter 169, the infrared filter 169, the infrared filter 169, the Except for the thickness of the filter 170 on the optical axis 190; surfaces 2, 4, 7, 9, 11, 13, and 15 are respectively the gap between the first lens 110 and the second lens 120 on the optical axis 190, the gap between the second lens 120 and the light barrier 100 on the optical axis 190, the gap between the third lens 130 and the fourth lens 140 on the optical axis 190, the gap between the fourth lens 140 and the fifth lens 150 on the optical axis 190, the gap between the fifth lens 150 and the sixth lens 160 on the optical axis 190, the gap between the sixth lens 160 and the infrared rejection filter 170 on the optical axis 190, and the gap between the infrared rejection filter 170 and the imaging surface 180 on the optical axis 190.

[0119] Table 2 is the aspheric surface data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are high-order aspheric surface coefficients. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration curves of the embodiments, and the definitions of the data in the embodiment tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

[0120] <Second embodiment>

[0121] Please refer to Figure 2A and Figure 2B ,in, Figure 2A is a schematic diagram of an imaging lens assembly according to a second embodiment of the present invention, Figure 2B From left to right are the field curvature and distortion curves of the imaging lens assembly of the second embodiment. Figure 2A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 210, a second lens 220, a light barrier 200, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, an infrared cut filter 270, and an imaging surface 280; wherein the imaging lens group includes six lenses with refractive power, but the present invention is not limited thereto.

[0122] The first lens 210 has negative refractive power and is made of glass. Its object-side surface 211 is convex near the optical axis 290 , and its image-side surface 212 is concave near the optical axis 290 . Both the object-side surface 211 and the image-side surface 212 are spherical.

[0123] The second lens 220 has positive refractive power and is made of plastic. Its object-side surface 221 is concave near the optical axis 290 , and its image-side surface 222 is convex near the optical axis 290 . Both the object-side surface 221 and the image-side surface 222 are aspherical.

[0124] The third lens 230 has positive refractive power and is made of plastic. Its object-side surface 231 is convex near the optical axis 290 , and its image-side surface 232 is convex near the optical axis 290 . Both the object-side surface 231 and the image-side surface 232 are aspherical.

[0125] The fourth lens 240 has negative refractive power and is made of plastic. Its object-side surface 241 is convex near the optical axis 290 , and its image-side surface 242 is concave near the optical axis 290 . Both the object-side surface 241 and the image-side surface 242 are aspherical.

[0126] The fifth lens 250 has positive refractive power and is made of plastic. Its object-side surface 251 is convex near the optical axis 290 , and its image-side surface 252 is convex near the optical axis 290 . Both the object-side surface 251 and the image-side surface 252 are aspherical.

[0127] The sixth lens 260 has negative refractive power and is made of plastic. Its object-side surface 261 is concave near the optical axis 290 , and its image-side surface 262 is concave near the optical axis 290 . Both the object-side surface 261 and the image-side surface 262 are aspherical.

[0128] The infrared cut filter 270 (IR-cut filter) is made of glass, which is arranged between the sixth lens 260 and the imaging surface 280 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 270 component can also be formed on the lens surface, and the infrared cut filter 270 can also be made of other materials.

[0129] Please refer to Table 3 and Table 4 below.

[0130]

[0131]

[0132]

[0133] In the second embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0134] The following data can be calculated by combining Table 3 and Table 4:

[0135]

[0136] <Third embodiment>

[0137] Please refer to Figure 3A and Figure 3B ,in, Figure 3A is a schematic diagram of an imaging lens assembly according to a third embodiment of the present invention, Figure 3B From left to right are the field curvature and distortion curves of the imaging lens assembly of the third embodiment. Figure 3A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 310, a second lens 320, a light barrier 300, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, an infrared cut filter 370, and an imaging surface 380; wherein the imaging lens group includes six lenses with refractive power, but is not limited thereto.

[0138] The first lens 310 has negative refractive power and is made of glass. Its object side surface 311 is convex near the optical axis 390 , and its image side surface 312 is concave near the optical axis 390 . Both the object side surface 311 and the image side surface 312 are aspherical.

[0139] The second lens 320 has positive refractive power and is made of plastic. Its object-side surface 321 is convex near the optical axis 390 , and its image-side surface 322 is convex near the optical axis 390 . Both the object-side surface 321 and the image-side surface 322 are aspherical.

[0140] The third lens 330 has positive refractive power and is made of plastic. Its object-side surface 331 is convex near the optical axis 390 , and its image-side surface 332 is convex near the optical axis 390 . Both the object-side surface 331 and the image-side surface 332 are aspherical.

[0141] The fourth lens 340 has negative refractive power and is made of plastic. Its object-side surface 341 is convex near the optical axis 390 , and its image-side surface 342 is concave near the optical axis 390 . Both the object-side surface 341 and the image-side surface 342 are aspherical.

[0142] The fifth lens 350 has positive refractive power and is made of plastic. Its object-side surface 351 is convex near the optical axis 390 , and its image-side surface 352 is convex near the optical axis 390 . Both the object-side surface 351 and the image-side surface 352 are aspherical.

[0143] The sixth lens 360 has negative refractive power and is made of plastic. Its object-side surface 361 is concave near the optical axis 390 , and its image-side surface 362 is concave near the optical axis 390 . Both the object-side surface 361 and the image-side surface 362 are aspherical.

[0144] The infrared cut filter 370 (IR-cut filter) is made of glass, which is arranged between the sixth lens 360 and the imaging surface 380 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 370 component can also be formed on the lens surface, and the infrared cut filter 370 can also be made of other materials.

[0145] Please refer to Table 5 and Table 6 below.

[0146]

[0147]

[0148]

[0149]

[0150] In the third embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0151] The following data can be calculated by combining Table 5 and Table 6:

[0152]

[0153] <Fourth embodiment>

[0154] Please refer to Figure 4A and Figure 4B ,in, Figure 4A is a schematic diagram of an imaging lens assembly according to a fourth embodiment of the present invention, Figure 4B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fourth embodiment. Figure 4A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 410, a second lens 420, a light barrier 400, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, an infrared cutoff filter 470, and an imaging surface 480; wherein the imaging lens group includes six lenses with refractive power, but is not limited thereto.

[0155] The first lens 410 has negative refractive power and is made of glass. Its object-side surface 411 is convex near the optical axis 490 , and its image-side surface 412 is concave near the optical axis 490 . Both the object-side surface 411 and the image-side surface 412 are aspherical.

[0156] The second lens 420 has positive refractive power and is made of plastic. Its object-side surface 421 is convex near the optical axis 490 , and its image-side surface 422 is convex near the optical axis 490 . Both the object-side surface 421 and the image-side surface 422 are aspherical.

[0157] The third lens 430 has positive refractive power and is made of plastic. Its object-side surface 431 is convex near the optical axis 490 , and its image-side surface 432 is convex near the optical axis 490 . Both the object-side surface 431 and the image-side surface 432 are aspherical.

[0158] The fourth lens 440 has negative refractive power and is made of plastic. Its object-side surface 441 is convex near the optical axis 490 , and its image-side surface 442 is concave near the optical axis 490 . Both the object-side surface 441 and the image-side surface 442 are aspherical.

[0159] The fifth lens element 450 has positive refractive power and is made of plastic. Its object-side surface 451 is convex near the optical axis 490 , and its image-side surface 452 is convex near the optical axis 490 . Both the object-side surface 451 and the image-side surface 452 are aspherical.

[0160] The sixth lens 460 has negative refractive power and is made of plastic. Its object-side surface 461 is concave near the optical axis 490 , and its image-side surface 462 is concave near the optical axis 490 . Both the object-side surface 461 and the image-side surface 462 are aspherical.

[0161] The infrared cut filter 470 (IR-cut filter) is made of glass, which is arranged between the sixth lens 460 and the imaging surface 480 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 470 component can also be formed on the lens surface, and the infrared cut filter 470 can also be made of other materials.

[0162] Please refer to Table 7 and Table 8 below.

[0163]

[0164]

[0165]

[0166]

[0167] In the fourth embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0168] The following data can be calculated by combining Table 7 and Table 8:

[0169]

[0170] <Fifth embodiment>

[0171] Please refer to Figure 5A and Figure 5B ,in, Figure 5A is a schematic diagram of an imaging lens assembly according to a fifth embodiment of the present invention, Figure 5B From left to right are the field curvature and distortion curves of the imaging lens assembly of the fifth embodiment. Figure 5A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 510, a second lens 520, a light barrier 500, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, an infrared filter 570, and an imaging surface 580; wherein the imaging lens group has six lenses with refractive power, but is not limited thereto.

[0172] The first lens 510 has negative refractive power and is made of glass. Its object side surface 511 is convex near the optical axis 590 , and its image side surface 512 is concave near the optical axis 590 . Both the object side surface 511 and the image side surface 512 are aspherical.

[0173] The second lens 520 has positive refractive power and is made of plastic. Its object-side surface 521 is convex near the optical axis 590 , and its image-side surface 522 is convex near the optical axis 590 . Both the object-side surface 521 and the image-side surface 522 are aspherical.

[0174] The third lens 530 has positive refractive power and is made of plastic. Its object-side surface 531 is convex near the optical axis 590 , and its image-side surface 532 is convex near the optical axis 590 . Both the object-side surface 531 and the image-side surface 532 are aspherical.

[0175] The fourth lens 540 has negative refractive power and is made of plastic. Its object-side surface 541 is convex near the optical axis 590 , and its image-side surface 542 is concave near the optical axis 590 . Both the object-side surface 541 and the image-side surface 542 are aspherical.

[0176] The fifth lens element 550 has positive refractive power and is made of plastic. Its object-side surface 551 is convex near the optical axis 590 , and its image-side surface 552 is convex near the optical axis 590 . Both the object-side surface 551 and the image-side surface 552 are aspherical.

[0177] The sixth lens 560 has negative refractive power and is made of plastic. Its object-side surface 561 is concave near the optical axis 590 , and its image-side surface 562 is concave near the optical axis 590 . Both the object-side surface 561 and the image-side surface 562 are aspherical.

[0178] The infrared cut filter 570 (IR-cut filter) is made of glass, which is arranged between the sixth lens 560 and the imaging surface 580 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 570 component can also be formed on the lens surface, and the infrared cut filter 570 can also be made of other materials.

[0179] Please refer to Table 9 and Table 10 below.

[0180]

[0181]

[0182]

[0183] Table 10 is the aspheric surface data in the fifth embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A2, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are high-order aspheric surface coefficients. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0184] The following data can be calculated by combining Table 9 and Table 10:

[0185]

[0186] <Sixth embodiment>

[0187] Please refer to Fig. 6A and Figure 6B ,in, Fig. 6A is a schematic diagram of an imaging lens assembly according to a sixth embodiment of the present invention, Figure 6B From left to right are the field curvature and distortion curves of the imaging lens assembly of the sixth embodiment. Fig. 6A It can be seen that the imaging lens group includes, from the object side to the image side, a first lens 610, a second lens 620, a light barrier 600, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, an infrared filter 670, and an imaging surface 680; wherein the imaging lens group has six lenses with refractive power, but is not limited to this.

[0188] The first lens 610 has negative refractive power and is made of glass. Its object-side surface 611 is convex near the optical axis 690 , and its image-side surface 612 is concave near the optical axis 690 . Both the object-side surface 611 and the image-side surface 612 are aspherical.

[0189] The second lens 620 has positive refractive power and is made of plastic. Its object-side surface 621 is convex near the optical axis 690 , and its image-side surface 622 is convex near the optical axis 690 . Both the object-side surface 621 and the image-side surface 622 are aspherical.

[0190] The third lens 630 has positive refractive power and is made of plastic. Its object-side surface 631 is convex near the optical axis 690 , and its image-side surface 632 is convex near the optical axis 690 . Both the object-side surface 631 and the image-side surface 632 are aspherical.

[0191] The fourth lens 640 has negative refractive power and is made of plastic. Its object-side surface 641 is convex near the optical axis 690 , and its image-side surface 642 is concave near the optical axis 690 . Both the object-side surface 641 and the image-side surface 642 are aspherical.

[0192] The fifth lens 650 has positive refractive power and is made of plastic. Its object-side surface 651 is convex near the optical axis 690 , and its image-side surface 652 is convex near the optical axis 690 . Both the object-side surface 651 and the image-side surface 652 are aspherical.

[0193] The sixth lens 660 has negative refractive power and is made of plastic. Its object-side surface 661 is convex near the optical axis 690 , and its image-side surface 662 is concave near the optical axis 690 . Both the object-side surface 661 and the image-side surface 662 are aspherical.

[0194] The infrared cut filter 670 (IR-cut filter) is made of glass, which is arranged between the sixth lens 660 and the imaging surface 680 and does not affect the focal length of the imaging lens group; it can be understood that the infrared cut filter 670 component can also be formed on the lens surface, and the infrared cut filter 670 can also be made of other materials.

[0195] Please refer to Table 11 and Table 12 below.

[0196]

[0197]

[0198]

[0199] In the sixth embodiment, the curve equation of the aspheric surface is expressed in the same form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment and are not repeated here.

[0200] The following data can be calculated by combining Table 11 and Table 12:

[0201]

[0202] In the aforementioned embodiments, a person with ordinary knowledge in the relevant field should be able to understand that in the imaging lens group provided by the present invention, the lens can be made of glass or plastic. The glass lens can increase the freedom of the refractive power configuration of the imaging lens group, and the glass lens can be made by related technologies such as grinding or molding. The plastic lens can reduce the production cost.

[0203] In the imaging lens group provided by the present invention, with respect to the lens having refractive power, if the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at the near optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at the near optical axis.

[0204] The imaging lens assembly provided by the present invention can be applied to optical systems that require ultra-wide angles, high imaging quality, and miniaturization, and can be widely used in photography, monitoring, automation equipment, vehicle surround systems, and electronic imaging systems in Internet of Things (IOT) devices, but is not limited thereto.

Claims

1. An imaging lens assembly, characterized in that: It includes a diaphragm and, in order from the object side to the image side, includes: A first lens with negative refractive power, and the object-side surface of the first lens is convex near the optical axis; A second lens with positive refractive power; A third lens with positive refractive power; A fourth lens with negative refractive power; A fifth lens with positive refractive power; and A sixth lens with negative refractive power, and the image-side surface of the sixth lens is concave near the optical axis; Wherein, the distance from the object-side surface of the first lens to the imaging surface on the optical axis is TL, the overall focal length of the imaging lens group is f, the maximum viewing angle of the imaging lens group is FOV, the maximum optical effective radius of the object-side surface of the first lens is CA1, and the following conditions are satisfied: 702.32 mm * degree < TL * (f * FOV) / CA1 < 1286.23 mm * degree.

2. The imaging lens assembly according to claim 1, characterized in that: The maximum optical effective radius of the image-side surface of the sixth lens is CA12, the angle at which the chief ray of the maximum viewing angle of the imaging lens group enters the imaging surface is CRA, and the following conditions are satisfied: 26.85 degrees < (CA1 / CA12) * CRA < 53.06 degrees.

3. The imaging lens assembly according to claim 1, characterized in that: The maximum imaging height of the imaging lens group is IMH, the maximum optical effective radius of the image-side surface of the sixth lens is CA12, the angle at which the chief ray of the maximum viewing angle of the imaging lens group enters the imaging surface is CRA, and the following conditions are satisfied: 34.51 degrees < (IMH / CA12) * CRA < 58.29 degrees.

4. The imaging lens assembly according to claim 1, characterized in that: The distance from the image-side surface of the sixth lens to the imaging surface on the optical axis is BFL, the displacement parallel to the optical axis from the intersection point of the image-side surface of the sixth lens on the optical axis to the position of the maximum effective radius of the image-side surface of the sixth lens is TDP12, the maximum imaging height of the imaging lens group is IMH, the maximum optical effective radius of the image-side surface of the sixth lens is CA12, and the following conditions are satisfied: 51.3 degrees < ATAN((BFL - TDP12) / (IMH - CA12)) < 85.83 degrees.

5. The imaging lens assembly according to claim 1, characterized in that: The maximum imaging height of the imaging lens group is IMH, the angle at which the chief ray of the maximum viewing angle of the imaging lens group enters the imaging surface is CRA, and the following conditions are satisfied: 30.55 degrees < (IMH / CA1) * CRA < 58.19 degrees.

6. The imaging lens assembly according to claim 5, characterized in that: The entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 12.42 mm < TL * CA1 / EPD < 26.15 mm.

7. The imaging lens assembly according to claim 1, characterized in that: The angle at which the chief ray of the maximum viewing angle of the imaging lens group enters the imaging surface is CRA, and the following conditions are satisfied: 21.84 mm < TL * (FOV / CRA) < 38.12 mm.

8. The imaging lens assembly according to claim 7, characterized in that: The following conditions are satisfied: 101.34 degrees < (TL * CRA) / f < 175.96 degrees.

9. The imaging lens assembly according to claim 1, characterized in that: The maximum imaging height of the imaging lens group is IMH, and the following conditions are satisfied: 6.85 mm < TL * (IMH / f) < 11.55 mm.

10. The imaging lens assembly according to claim 9, characterized in that: The entrance pupil diameter of the imaging lens group is EPD, and the following conditions are satisfied: 1.65 mm < TL * EPD / IMH < 2.76 mm.

11. The imaging lens assembly according to claim 1, characterized in that: The maximum optical effective radius of the image-side surface of the first lens is CA2, and the radius of curvature of the image-side surface of the first lens is R2, and the following condition is satisfied: 1.33 < (2 * CA2) / R2 < 2.

27.

12. The imaging lens assembly according to claim 1, characterized in that: The maximum optical effective radius of the image-side surface of the sixth lens is CA12, and the maximum imaging height of the imaging lens group is IMH, and the following condition is satisfied: 2.12 < (CA1 / CA12) * (TL / IMH) < 4.

10.

13. The imaging lens assembly according to claim 1, characterized in that: The focal length of the third lens is f3, and the focal length of the fifth lens is f5, and the following condition is satisfied: 12.72 mm < TL * (f3 + f5) / f < 25.74 mm.

14. The imaging lens assembly according to claim 1, characterized in that: The maximum imaging height of the imaging lens group is IMH, the image side surface curvature radius of the first lens is R2, and meets the following conditions: 1.62 mm -1 <(TL / IMH) / R2<2.75mm - 1.

15. The imaging lens assembly according to claim 1, characterized in that: The distance between the aperture stop and the imaging surface on the optical axis is SL, and the following condition is satisfied: 12.9 mm < TL * SL / f < 21.33 mm.

Images