Patent ID: 12253743

DETAILED DESCRIPTION OF THE INVENTION

An optical imaging lens100according to a first embodiment of the present invention is illustrated inFIG.1A, which includes, in order along an optical axis Z from an object side to an image side, a first optical assembly C1, a second optical assembly C2, a third optical assembly C3, a first aperture ST1, a fourth optical assembly C4, a fifth optical assembly C5, a second aperture ST2, a sixth optical assembly C6, and a seventh optical assembly C7. In the current embodiment, one of the first optical assembly, the second optical assembly, the third optical assembly, the fourth optical assembly, the fifth optical assembly, the sixth optical assembly, and the seventh optical assembly C7includes a compound lens with at least two lenses that are adhered, while the others are single lens.

The first optical assembly C1has negative refractive power. In the current embodiment, the first optical assembly C1is a single lens that includes a first lens L1, wherein the first lens L1is a negative meniscus, and an object-side surface S1of the first lens L1is a convex surface toward the object side, and an image-side surface S2of the first lens L1is a concave surface that is arc-shaped. As shown inFIG.1A, a part of a surface of the first lens L1toward the image side is recessed to form the image-side surface S2, and the optical axis Z passes through the object-side surface S1and the image-side surface S2.

The second optical assembly C2has negative refractive power. In the current embodiment, the second optical assembly C2is a single lens that includes a second lens L2, wherein the second lens L2is a negative meniscus, and an object-side surface S3of the second lens L2is a convex surface that is slightly convex toward the object side, and an image-side surface S4of the second lens L2is a concave surface that is arc-shaped. The object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, or both of the object-side surface S3and the image-side surface S4of the second lens L2are aspheric surfaces. As shown inFIG.1A, in the current embodiment, both of the object-side surface S3and the image-side surface S4of the second lens L2are aspheric surfaces, wherein a part of a surface of the second lens L2toward the image side is recessed to form the image-side surface S4, and the optical axis Z passes through the object-side surface S3and the image-side surface S4.

The third optical assembly C3has positive refractive power. In the current embodiment, the third optical assembly C3is a single lens that includes a third lens L3, wherein the third lens L3is a biconvex lens (i.e., both of an object-side surface S5of the third lens L3and an image-side surface S6of the third lens L3are convex surfaces). As shown inFIG.1A, the object-side surface S5of the third lens L3is slightly convex toward the object side, and the image-side surface S6of the third lens L3is convex toward the image side in an arc-shape.

The fourth optical assembly C4has positive refractive power. In the current embodiment, the fourth optical assembly C4is a single lens that includes a fourth lens L4, wherein the fourth lens L4is a biconvex lens (i.e., both of an object-side surface S7of the fourth lens L4and an image-side surface S8of the fourth lens L4are convex surfaces). As shown inFIG.1A, the object-side surface S7of the fourth lens L4is convex toward the object side in an arc shape, and the image-side surface S8of the fourth lens L4is convex toward the image side in an arc-shape. In the current embodiment, the first aperture ST1is disposed between the third lens L3of the third optical assembly C3and the fourth lens L4of the fourth optical assembly C4and is closer to the object-side surface S7of the fourth lens L4than the image-side surface S6of the third lens L3.

The fifth optical assembly C5has positive refractive power. In the current embodiment, the fifth optical assembly C5is a compound lens formed by adhering a fifth lens L5and a sixth lens L6, which could effectively improve a chromatic aberration of the optical imaging lens100. As shown inFIG.1A, the fifth lens is a negative meniscus with negative refractive power, wherein an object-side surface S9of the fifth lens L5is a convex surface that is convex toward the object side in an arc-shape, and an image-side surface S10of the fifth lens L5is a concave surface that is arc-shaped. In the current embodiment, a part of a surface of the fifth lens L5toward the image side is recessed to form the image-side surface S10. The sixth lens L6is a biconvex lens with positive refractive power (i.e., both of an object-side surface S11of the sixth lens L6and an image-side surface S12of the sixth lens L6are convex surfaces), wherein the object-side surface S11of the sixth lens L6and the image-side surface S10of the fifth lens L5are adhered and form a same surface.

The sixth optical assembly C6has negative refractive power. In the current embodiment, the sixth optical assembly C6is a single lens that includes a seventh lens L7, wherein the seventh lens L7is a negative meniscus; an object-side surface S13of the seventh lens L7is a concave surface, and an image-side surface S14of the seventh lens L7is a convex surface. As shown inFIG.1A, a part of a surface of the seventh lens L7toward the object side is recessed to form the object-side surface S13, and the image-side surface S14of the seventh lens L7is convex toward the image side in an arc-shape. In the current embodiment, the second aperture ST2is disposed between the sixth lens L6of the fifth optical assembly C5and the seventh lens L7of the sixth optical assembly C6.

The seventh optical assembly C7has positive refractive power. In the current embodiment, the seventh optical assembly C7is a single lens that includes an eighth lens L8, wherein the eighth lens L8is a biconvex lens (i.e., both of an object-side surface S15of the eighth lens L8and an image-side surface S16of the eighth lens L8are convex surfaces). The object-side surface S15of the eighth lens L8, the image-side surface S16of the eighth lens L8, or both of the object-side surface S15and the image-side surface S16of the eighth lens L8are aspheric surfaces. As shown inFIG.1A, in the current embodiment, both of the object-side surface S15and the image-side surface S16of the eighth lens L8are aspheric surfaces, wherein the object-side surface S15of the eighth lens L8is convex toward the object side in an arc-shape, and the image-side surface S16of the eighth lens L8is convex toward the image side in an arc-shape.

Additionally, the optical imaging lens100further includes an infrared filter L9and a protective glass L10, wherein the infrared filter L9is closer to the image-side surface S16of the eighth lens L8of the seventh optical assembly C7than an image plane Im of the optical imaging lens100for filtering out excess infrared rays in an image light passing through the first optical assembly C1to the seventh optical assembly C7to improve an image quality. The protective glass L10is disposed between the infrared filter L9and the image plane Im for protecting the infrared filter L9.

In order to keep the optical imaging lens100in good optical performance and high imaging quality, the optical imaging lens100further satisfies:
−0.1>F/f1>−0.3;  (1)
−0.3>F/f2>−0.55;  (2)
0.25>F/f3>0.03;  (3)
0.3>F/f4>0.2;  (4)
0.25>F/f56>0.1; −0.01>F/f5>−0.09; 0.2>F/f6>0.05;  (5)
−0.15>F/f7>−0.3;  (6)
0.35>F/f8>0.2;  (7)
0.2≥F/ftotal≥0.1;  (8)

wherein F is a focal length of the optical imaging lens100; f1 is a focal length of the first lens L1of the first optical assembly C1; f2 is a focal length of the second lens L2of the second optical assembly C2; f3 is a focal length of the third lens L3of the third optical assembly C3; f4 is a focal length of the fourth lens L4of the fourth optical assembly C4; f5 is a focal length of the fifth lens L5of the fifth optical assembly C5; f6 is a focal length of the sixth lens L6of the fifth optical assembly C5; f7 is a focal length of the seventh lens L7of the sixth optical assembly C6; f8 is a focal length of the eighth lens L8of the seventh optical assembly C7; f56 is a focal length of the fifth optical assembly C5; ftotal is a focal length of a combination of the first optical assembly C1to the seventh optical assembly C7.

Parameters of the optical imaging lens100of the first embodiment of the present invention are listed in following Table 1, including the focal length F of the optical imaging lens100(also called an effective focal length (EFL)), a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, the focal length of each lens, and the focal length (cemented focal length) of the fifth optical assembly C5, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm).

TABLE 1F = 4.436 mm; Fno = 2.06; HFOV = 75.6 degCementedDFocalfocalSurfaceR(mm)(mm)NdlengthlengthNoteS115.21.871.66−23.64L1S28.013.921S327.82.571.52−10.42L2S43.397.281S558.791.711.8233.72L3S6−51.28.471ST1Infinity0.091ST1S718.861.911.6317.27L4S8−23.380.141S913.874.541.94−144.0627.36L5S10, S115.633.041.539.58L6S12−15.11−0.081ST2Infinity0.531ST2S13−10.520.791.73−20.08L7S14−28.70.291S15136.331.5915.54L8S16−20.910.371S17Infinity0.71.52Infrared filter L9S18Infinity3.971S19Infinity0.51.53Protective glass L10S20Infinity0.41ImInfinity0.51.53Im

It can be seen from Table 1 that, in the current embodiment, the focal length F of the optical imaging lens100is 4.436 mm, and the Fno is 2.07, and the HFOV is 76.2 degrees, wherein f1=−23.63 mm; f2=−10.42 mm; f3=33.72 mm; f4=17.27 mm; f5=−144.06 mm; f6=39.58 mm; f7=−20.08 mm; f8=15.54 mm; f56=27.36 mm.

Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the first embodiment are as follows: F/f1=−0.19; F/f2=−0.43; F/f3=0.13; F/f4=0.26; F/f56=0.16; F/f5=−0.03; F/f6=0.11; F/f7=−0.22; F/f8=0.29; F/ftotal=0.11.

With the aforementioned design, the first optical assembly C1to the seventh optical assembly C7satisfy the aforementioned conditions (1) to (8) of the optical imaging lens100.

Moreover, an aspheric surface contour shape Z of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens100according to the first embodiment could be obtained by following formula:

Z=ch21+1-(1+k)⁢c2⁢h2+A2⁢h2+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16
wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A2, A4, A6, A8, A10, A12, A14, and A16 respectively represents different order coefficient of h.

The conic constant k of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens100according to the first embodiment and the different order coefficient of A2, A4, A6, A8, A10, A12, A14, and A16 are listed in following Table 2:

TABLE 2SurfaceS3S4S15S16k2.95E+001.075−6.03E+00−1.02E+01A20000A4−4.45E−04−7.19E−052.45E−042.12E−04A68.97E−061.15E−058.10E−07−6.21E−06A8−5.27E−07−2.88E−06−4.14E−082.94E−07A102.54E−082.66E−0700A12−7.22E−10−1.25E−0800A141.07E−113.20E−1000A16−4.98E−14−3.32E−1200

Taking optical simulation data to verify the imaging quality of the optical imaging lens100, whereinFIG.1Ba diagram showing the astigmatic field curves according to the first embodiment;FIG.1Cis a diagram showing the distortion according to the first embodiment;FIG.1Dis a diagram showing the modulus of the OTF according to the first embodiment. InFIG.1B, a curve S is data of a sagittal direction, and a curve T is data of a tangential direction. The graphics shown inFIG.1CandFIG.1Dare within a standard range. In this way, the optical imaging lens100of the first embodiment could effectively enhance image quality and lower a distortion thereof.

An optical imaging lens200according to a second embodiment of the present invention is illustrated inFIG.2A, which includes, in order along an optical axis Z from an object side to an image side, a first optical assembly C1, a second optical assembly C2, a third optical assembly C3, a first aperture ST1, a fourth optical assembly C4, a fifth optical assembly C5, a second aperture ST2, a sixth optical assembly C6, and a seventh optical assembly C7.

The first optical assembly C1has negative refractive power. In the current embodiment, the first optical assembly C1is a single lens that includes a first lens L1, wherein the first lens L1is a negative meniscus, and an object-side surface S1of the first lens L1is a convex surface toward the object side, and an image-side surface S2of the first lens L1is a concave surface that is arc-shaped. As shown inFIG.2A, a part of a surface of the first lens L1toward the image side is recessed to form the image-side surface S2, and the optical axis Z passes through the object-side surface S1and the image-side surface S2.

The second optical assembly C2has negative refractive power. In the current embodiment, the second optical assembly C2is a single lens that includes a second lens L2, wherein the second lens L2is a negative meniscus, and an object-side surface S3of the second lens L2is a convex surface that is slightly convex toward the object side, and an image-side surface S4of the second lens L2is a concave surface that is arc-shaped. As shown inFIG.2A, in the current embodiment, both of the object-side surface S3and the image-side surface S4of the second lens L2are aspheric surfaces, wherein a part of a surface of the second lens L2toward the image side is recessed to form the image-side surface S4, and the optical axis Z passes through the object-side surface S3and the image-side surface S4.

The third optical assembly C3has positive refractive power. In the current embodiment, the third optical assembly C3is a single lens that includes a third lens L3, wherein the third lens L3is a biconvex lens (i.e., both of an object-side surface S5of the third lens L3and an image-side surface S6of the third lens L3are convex surfaces). As shown inFIG.2A, the object-side surface S5of the third lens L3is slightly convex toward the object side, and the image-side surface S6of the third lens L3is convex toward the image side in an arc-shape.

The fourth optical assembly C4has positive refractive power. In the current embodiment, the fourth optical assembly C4is a single lens that includes a fourth lens L4, wherein the fourth lens L4is a biconvex lens (i.e., both of an object-side surface S7of the fourth lens L4and an image-side surface S8of the fourth lens L4are convex surfaces). As shown inFIG.2A, the object-side surface S7of the fourth lens L4is convex toward the object side in an arc-shape, and the image-side surface S8of the fourth lens L4is convex toward the image side in an arc-shape. In the current embodiment, the first aperture ST1is disposed between the third lens L3of the third optical assembly C3and the fourth lens L4of the fourth optical assembly C4and is closer to the object-side surface S7of the fourth lens L4than the image-side surface S6of the third lens L3.

The fifth optical assembly C5has positive refractive power. In the current embodiment, the fifth optical assembly C5is a compound lens formed by adhering a fifth lens L5and a sixth lens L6, which could effectively improve a chromatic aberration of the optical imaging lens200. As shown inFIG.2A, the fifth lens is a negative meniscus with negative refractive power, wherein an object-side surface S9of the fifth lens L5is a convex surface that is convex toward the object side in an arc-shape, and an image-side surface S10of the fifth lens L5is a concave surface that is arc-shaped. In the current embodiment, a part of a surface of the fifth lens L5toward the image side is recessed to form the image-side surface S10. The sixth lens L6is a biconvex lens with positive refractive power (i.e., both of an object-side surface S11of the sixth lens L6and an image-side surface S12of the sixth lens L6are convex surfaces), wherein the object-side surface S11of the sixth lens L6and the image-side surface S10of the fifth lens L5are adhered and form a same surface.

The sixth optical assembly C6has negative refractive power. In the current embodiment, the sixth optical assembly C6is a single lens that includes a seventh lens L7, wherein the seventh lens L7is a negative meniscus; an object-side surface S13of the seventh lens L7is a concave surface, and an image-side surface S14of the seventh lens L7is a convex surface. As shown inFIG.2A, a part of a surface of the seventh lens L7toward the object side is recessed to form the object-side surface S13, and the image-side surface S14of the seventh lens L7is convex toward the image side in an arc-shape. In the current embodiment, the second aperture ST2is disposed between the sixth lens L6of the fifth optical assembly C5and the seventh lens L7of the sixth optical assembly C6.

The seventh optical assembly C7has positive refractive power In the current embodiment, the seventh optical assembly C7is a single lens that includes an eighth lens L8, wherein the eighth lens L8is a biconvex lens (i.e., both of an object-side surface S15of the eighth lens L8and an image-side surface S16of the eighth lens L8are convex surfaces). As shown inFIG.2A, in the current embodiment, both of the object-side surface S15and the image-side surface S16of the eighth lens L8are aspheric surfaces, wherein the object-side surface S15of the eighth lens L8is convex toward the object side in an arc-shape, and the image-side surface S16of the eighth lens L8is convex toward the image side in an arc-shape.

Additionally, the optical imaging lens200further includes an infrared filter L9and a protective glass L10, wherein the infrared filter L9is closer to the image-side surface S16of the eighth lens L8of the seventh optical assembly C7than an image plane Im of the optical imaging lens100for filtering out excess infrared rays in an image light passing through the first optical assembly C1to the seventh optical assembly C7to improve an image quality. The protective glass L10is disposed between the infrared filter L9and the image plane Im for protecting the infrared filter L9.

In order to keep the optical imaging lens200in good optical performance and high imaging quality, the optical imaging lens200further satisfies:
−0.1>F/f1>−0.3;  (1)
−0.3>F/f2>−0.55;  (2)
0.25>F/f3>0.03;  (3)
0.3>F/f4>0.2;  (4)
0.25>F/f56>0.1; −0.1>F/f5>−0.09; 0.2>F/f6>0.05;  (5)
−0.15>F/f7>−0.3;  (6)
0.35>F/f8>0.2;  (7)
0.2≥F/ftotal≥0.1;  (8)

wherein F is a focal length of the optical imaging lens100; f1 is a focal length of the first lens L1of the first optical assembly C1; f2 is a focal length of the second lens L2of the second optical assembly C2; f3 is a focal length of the third lens L3of the third optical assembly C3; f4 is a focal length of the fourth lens L4of the fourth optical assembly C4; f5 is a focal length of the fifth lens L5of the fifth optical assembly C5; f6 is a focal length of the sixth lens L6of the fifth optical assembly C5; f7 is a focal length of the seventh lens L7of the sixth optical assembly C6; f8 is a focal length of the eighth lens L8of the seventh optical assembly C7; f56 is a focal length of the fifth optical assembly C5; ftotal is a focal length of a combination of the first optical assembly C1to the seventh optical assembly C7.

Parameters of the optical imaging lens200of the second embodiment of the present invention are listed in following Table 3, including the focal length F of the optical imaging lens200(also called an effective focal length (EFL)). a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, the focal length of each lens, and the focal length (cemented focal length) of the fifth optical assembly C5, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm).

TABLE 3F = 4.432 mm; Fno = 2.07; HFOV = 76.2 degCementedFocalfocalSurfaceR(mm)D(min)NdlengthlengthNoteS115.21.861.66−23.63L1S26.013.931S329.942.591.52−10.43L2S44.47.281S558.821.711.8233.75L3S6−50.198.471ST1Infinity0.11ST1S719.851.91.6317.2L4S8−23.390.141S913.874.541.94−144.0627.36L5S10, S115.633.041.539.59L6S12−14.11−0.081ST2Infinity0.531ST2S13−10.520.791.73−20.1L7S14−29.70.291S15156.331.5915.6L8S16−22.920.371S17Infinity0.71.52InfraredS18Infinity3.971filter L9S19Infinity0.51.53Protectiveglass L10S20Infinity0.41ImInfinity0.51.53Im

It can be seen from Table 3 that, in the second embodiment, the focal length (F) of the optical imaging lens200is 4.432 mm, and the Fno is 2.07, and the HFOV is 76.2 degrees, wherein f1=−23.64 mm; f2=−10.42 mm; f3=33.72 mm; f4=17.27 mm; f5=−144.06 mm; f6=39.58 mm; f7=−20.08 mm; f8=15.54 mm; f56=27.36 mm.

Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the second embodiment are as follows: F/f1=−0.19; F/f2=−0.42; F/f3=0.13; F/f4=0.26; F/f56=0.16; F/f5=−0.03; F/f6=0.11; F/f7=−0.22; F/f8=0.28; F/ftotal=0.1.

With the aforementioned design, the first optical assembly C1to the seventh optical assembly C7satisfy the aforementioned conditions (1) to (8) of the optical imaging lens200.

Moreover, an aspheric surface contour shape Z of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens200according to the second embodiment could be obtained by following formula:

Z=ch21+1-(1+k)⁢c2⁢h2+A2⁢h2+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16
wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A2, A4, A6, A8, A10, A12, A14, and A16 respectively represents different order coefficient of h.

The conic constant k of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens200according to the second embodiment and the different order coefficient of A2, A4, A6, A8, A10, A12, A14, and A16 are listed in following Table 4:

TABLE 4SurfaceS3S4S15S16k2.96E+00−1.08E+00−6.04E+00−1.02E+01A20000A4−4.45E−04−7.27E−052.45E−042.11E−04A68.96E−061.15E−058.02E−07−6.27E−06A8−5.27E−07−2.88E−06−4.16E−082.95E−07A102.54E−082.66E−0700A12−7.22E−10−1.25E−0800A141.07E−113.20E−1000A16−4.97E−14−3.33E−1200

Taking optical simulation data to verify the imaging quality of the optical imaging lens200, whereinFIG.2Ba diagram showing the astigmatic field curves according to the second embodiment;FIG.2Cis a diagram showing the distortion according to the second embodiment;FIG.2Dis a diagram showing the modulus of the OTF according to the second embodiment. InFIG.2B, a curve S is data of a sagittal direction, and a curve T is data of a tangential direction. The graphics shown inFIG.2CandFIG.2Dare within a standard range. In this way, the optical imaging lens200of the second embodiment could effectively enhance image quality and lower a distortion thereof.

An optical imaging lens300according to a third embodiment of the present invention is illustrated inFIG.3A, which includes, in order along an optical axis Z from an object side to an image side, a first optical assembly C1, a second optical assembly C2, a third optical assembly C3, a first aperture ST1, a fourth optical assembly C4, a fifth optical assembly C5, a second aperture ST2, a sixth optical assembly C6, and a seventh optical assembly C7.

The first optical assembly C1has negative refractive power. In the current embodiment, the first optical assembly C1is a single lens that includes a first lens L1, wherein the first lens L1is a negative meniscus, and an object-side surface S1of the first lens L1is a convex surface toward the object side, and an image-side surface S2of the first lens L1is a concave surface that is arc-shaped. As shown inFIG.3A, a part of a surface of the first lens L1toward the image side is recessed to form the image-side surface S2, and the optical axis Z passes through the object-side surface S1and the image-side surface S2.

The second optical assembly C2has negative refractive power. In the current embodiment, the second optical assembly C2is a single lens that includes a second lens L2, wherein the second lens L2is a negative meniscus, and an object-side surface S3of the second lens L2is a convex surface that is slightly convex toward the object side, and an image-side surface S4of the second lens L2is a concave surface that is arc-shaped. As shown inFIG.3A, in the current embodiment, both of the object-side surface S3and the image-side surface S4of the second lens L2are aspheric surfaces, wherein a part of a surface of the second lens L2toward the image side is recessed to form the image-side surface S4, and the optical axis Z passes through the object-side surface S3and the image-side surface S4.

The third optical assembly C3has positive refractive power. In the current embodiment, the third optical assembly C3is a single lens that includes a third lens L3, wherein the third lens L3is a biconvex lens (i.e., both of an object-side surface S5of the third lens L3and an image-side surface S6of the third lens L3are convex surfaces). As shown inFIG.3A, the object-side surface S5of the third lens L3is slightly convex toward the object side, and the image-side surface S6of the third lens L3is convex toward the image side in an arc-shape.

The fourth optical assembly C4has positive refractive power. In the current embodiment, the fourth optical assembly C4is a single lens that includes a fourth lens L4, wherein the fourth lens L4is a biconvex lens (i.e., both of an object-side surface S7of the fourth lens L4and an image-side surface S8of the fourth lens L4are convex surfaces). As shown inFIG.3A, the object-side surface S7of the fourth lens L4is convex toward the object side in an arc shape, and the image-side surface S8of the fourth lens L4is convex toward the image side in an arc-shape. In the current embodiment, the first aperture ST1is disposed between the third lens L3of the third optical assembly C3and the fourth lens L4of the fourth optical assembly C4and is closer to the object-side surface S7of the fourth lens L4than the image-side surface S6of the third lens L3.

The fifth optical assembly C5has positive refractive power. In the current embodiment, the fifth optical assembly C5is a compound lens formed by adhering a fifth lens L5and a sixth lens L6, which could effectively improve a chromatic aberration of the optical imaging lens300. As shown inFIG.3A, the fifth lens is a negative meniscus with negative refractive power, wherein an object-side surface S9of the fifth lens L5is a convex surface that is convex toward the object side in an arc-shape, and an image-side surface S10of the fifth lens L5is a concave surface that is arc-shaped. In the current embodiment, a part of a surface of the fifth lens L5toward the image side is recessed to form the image-side surface S10. The sixth lens L6is a biconvex lens with positive refractive power (i.e., both of an object-side surface S11of the sixth lens L6and an image-side surface S12of the sixth lens L6are convex surfaces), wherein the object-side surface S11of the sixth lens L6and the image-side surface S10of the fifth lens L5are adhered and form a same surface.

The sixth optical assembly C6has negative refractive power. In the current embodiment, the sixth optical assembly C6is a single lens that includes a seventh lens L7, wherein the seventh lens L7is a negative meniscus; an object-side surface S13of the seventh lens L7is a concave surface, and an image-side surface S14of the seventh lens L7is a convex surface. As shown inFIG.3A, a part of a surface of the seventh lens L7toward the object side is recessed to form the object-side surface S13, and the image-side surface S14of the seventh lens L7is convex toward the image side in an arc-shape. In the current embodiment, the second aperture ST2is disposed between the sixth lens L6of the fifth optical assembly C5and the seventh lens L7of the sixth optical assembly C6.

The seventh optical assembly C7has positive refractive power. In the current embodiment, the seventh optical assembly C7is a single lens that includes an eighth lens L8, wherein the eighth lens L8is a biconvex lens (i.e., both of an object-side surface S15of the eighth lens L8and an image-side surface S16of the eighth lens L8are convex surfaces). As shown inFIG.3A, in the current embodiment, both of the object-side surface S15and the image-side surface S16of the eighth lens L8are aspheric surfaces, wherein the object-side surface S15of the eighth lens L8is convex toward the object side in an arc-shape, and the image-side surface S16of the eighth lens L8is convex toward the image side in an arc-shape.

Additionally, the optical imaging lens300further includes an infrared filter L9and a protective glass L10, wherein the infrared filter L9is closer to the image-side surface S16of the eighth lens L8of the seventh optical assembly C7than an image plane Im of the optical imaging lens300for filtering out excess infrared rays in an image light passing through the first optical assembly C1to the seventh optical assembly C7to improve an image quality. The protective glass L10is disposed between the infrared filter L9and the image plane Im for protecting the infrared filter L9.

In order to keep the optical imaging lens300in good optical performance and high imaging quality, the optical imaging lens300further satisfies:
−0.1>F/f1>−0.3;  (1)
−0.3>F/f2>−0.55;  (2)
0.25>F/f3>0.03;  (3)
0.3>F/f4>0.2;  (4)
0.25>F/f56>0.1; −0.01>F/f5>−0.09; 0.2>F/f6>0.05;  (5)
−0.15>F/f7>−0.3;  (6)
0.35>F/f8>0.2;  (7)
0.2≥F/ftotal≥0.1;  (8)

wherein F is a focal length of the optical imaging lens100; f1 is a focal length of the first lens L1of the first optical assembly C1; f2 is a focal length of the second lens L2of the second optical assembly C2; f3 is a focal length of the third lens L3of the third optical assembly C3; f4 is a focal length of the fourth lens L4of the fourth optical assembly C4; f5 is a focal length of the fifth lens L5of the fifth optical assembly C5; f6 is a focal length of the sixth lens L6of the fifth optical assembly C5; f7 is a focal length of the seventh lens L7of the sixth optical assembly C6; f8 is a focal length of the eighth lens L8of the seventh optical assembly C7; f56 is a focal length of the fifth optical assembly C5; ftotal is a focal length of a combination of the first optical assembly C1to the seventh optical assembly C7.

Parameters of the optical imaging lens300of the third embodiment of the present invention are listed in following Table 5, including the focal length F of the optical imaging lens100(also called an effective focal length (EFL)), a F-number (Fno), a maximal field of view (HFOV), a radius of curvature (R) of each lens, a distance (D) between each surface and the next surface on the optical axis Z, a refractive index (Nd) of each lens, the focal length of each lens, and the focal length (cemented focal length) of the fifth optical assembly C5, wherein a unit of the focal length, the radius of curvature, and the distance is millimeter (mm).

TABLE 3F = 4.29 mm; Fno = 2.05; HFOV = 75.66 degCementedFocalfocalSurfaceR(mm)D(mm)NdlengthlengthNoteS115.381.391.66−22.68L1S26.024.051S332.864.041.52−10.48L2S45.457.281S560.131.791.8233.67L3S6−49.368.571STIInfinity0.11ST1S719.711.891.6317.23L4S8−22.650.21S914.874.551.94−14327.34L5S10, S117.633.061.539.59L6S12−14.11−0.061ST2Infinity0.531ST2SB−9.460.81.73−19.86L7S14−29.860.381SB15.056.381.5915.87L8S16−23.160.371S17Infinity0.71.52Infraredfilter L9S18Infinity3.961S19Infinity0.51.53Protectiveglass L10S20Infinity0.41ImInfinityIm

It can be seen from Table 5 that, in the current embodiment, the focal length F of the optical imaging lens100is 4.29 mm, and the Fno is 2.05, and the HFOV is 75.66 degrees, wherein f1=−22.68 mm; f2=−10.48 mm; f3=33.67 mm; f4=17.23 mm; f5=−143 mm; f6=39.59 mm; f7=−19.86 mm; f8=15.87 mm; f56=27.34 mm.

Additionally, based on the above detailed parameters, detailed values of the aforementioned conditional formula in the second embodiment are as follows: F/f1=−0.19; F/f2=−0.41; F/f3=0.13; F/f4=0.25; F/f56=0.16; F/f5=−0.03; F/f6=0.11; F/f7=−0.22; F/f8=0.27; F/ftotal=0.1.

With the aforementioned design, the first optical assembly C1to the seventh optical assembly C7satisfy the aforementioned conditions (1) to (8) of the optical imaging lens300.

Moreover, an aspheric surface contour shape Z of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens300according to the third embodiment could be obtained by following formula:

Z=ch21+1-(1+k)⁢c2⁢h2+A2⁢h2+A4⁢h4+A6⁢h6+A8⁢h8+A10⁢h10+A12⁢h12+A14⁢h14+A16⁢h16
wherein Z is aspheric surface contour shape; c is reciprocal of radius of curvature; h is half the off-axis height of the surface; k is conic constant; A2, A4, A6, A8, A10, A12, A14, and A16 respectively represents different order coefficient of h.

The conic constant k of each of the object-side surface S3of the second lens L2, the image-side surface S4of the second lens L2, the object-side surface S15of the eighth lens L8, and the image-side surface S16of the eighth lens L8of the optical imaging lens300according to the third embodiment and the different order coefficient of A2, A4, A6, A8, A10, A12, A14, and A16 are listed in following Table 6:

TABLE 4SurfaceS3S4S15S16k3.08E+00−1.12E+00−6.44E+00−3.28E+00A20000A4−4.34E−04−1.37E−042.27E−041.44E−04A68.47E−061.30E−051.21E−07−8.48E−06A8−5.32E−07−2.83E−06−8.30E−083.22E−07A102.54E−082.67E−0700A12−7.24E−10−1.26E−0800A141.08E−113.21E−1000A16−4.60E−14−3.23E−1200

Taking optical simulation data to verify the imaging quality of the optical imaging lens300, whereinFIG.3Ba diagram showing the astigmatic field curves according to the third embodiment;FIG.3Cis a diagram showing the distortion according to the third embodiment;FIG.3Dis a diagram showing the modulus of the OTF according to the third embodiment. InFIG.3B, a curve S is data of a sagittal direction, and a curve T is data of a tangential direction. The graphics shown inFIG.3CandFIG.3Dare within a standard range. In this way, the optical imaging lens300of the third embodiment could effectively enhance image quality and lower a distortion thereof.

It must be pointed out that the embodiments described above are only some preferred embodiments of the present invention. It is noted that, the parameters listed in Tables are not a limitation of the present invention. All equivalent structures which employ the concepts disclosed in this specification and the appended claims should fall within the scope of the present invention.