TWI763748B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens is with negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens is with refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens is with refractive power and includes a convex surface facing the image side. The fifth lens is a biconvex lens with positive refractive power. The sixth lens is with negative refractive power and includes a concave surface facing the object side. The seventh lens is a meniscus with refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in order from the object side to the image side along an optical axis.

Description

Imaging Lens (21)

The present invention relates to an imaging lens.

In addition to the development trend of today's imaging lenses, in addition to the continuous development of miniaturization and high resolution, with different application requirements, it is also necessary to have the ability to resist environmental temperature changes. The conventional imaging lenses can no longer meet the current needs. There is another imaging lens with a new architecture to meet the requirements of miniaturization, high resolution and resistance to environmental temperature changes at the same time.

In view of this, the main purpose of the present invention is to provide an imaging lens, which has a short overall length, high resolution, and resistance to environmental temperature changes, but still has good optical performance.

The imaging lens of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens is a biconvex lens with positive refractive power. The sixth lens has negative refractive power and includes a concave surface facing the object side. The seventh lens has positive refractive power and includes a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged along an optical axis from the object side to the image side.

The refractive power of the second lens is positive, and further includes a concave surface facing the object side and a convex surface facing the image side, the fourth lens has a negative refractive power, and further includes a concave surface facing the object side, and the seventh lens has a positive refractive power, and further includes a concave surface facing The image side.

The refractive power of the second lens is negative, and further includes a convex surface facing the object side and a concave surface facing the image side, the fourth lens has a positive refractive power, and further includes a convex surface facing the object side, and the seventh lens has a positive refractive power, and further includes a concave surface facing the object side.

The imaging lens of the present invention may further include an eighth lens disposed between the fifth lens and the image side, and the eighth lens is a meniscus lens.

The eighth lens has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side.

The imaging lens satisfies the following conditions: 0<f ₁ ×f ₆ <215; where f ₁ is the effective focal length of one of the first lenses (in millimeters), and f ₆ is the effective focal length of one of the sixth lenses (in millimeters) unit).

The imaging lens satisfies the following conditions: 20<f ₃ ×f ₅ <30; where f ₃ is one of the effective focal lengths of the third lens (in millimeters), and f ₅ is one of the effective focal lengths of the fifth lens (in millimeters) unit).

The imaging lens satisfies the following conditions: -95<f ₅ ×f ₆ <0; where f ₅ is the effective focal length of one of the fifth lenses (in millimeters), and f ₆ is the effective focal length of one of the sixth lenses (in millimeters) units).

The imaging lens satisfies the following conditions: -45<f ₁ +f ₆ <0; wherein, f ₁ is the effective focal length of one of the first lenses (in millimeters), and f ₆ is the effective focal length of one of the sixth lenses (in millimeters) units).

The imaging lens satisfies the following conditions: -15.5<f ₆ -f ₄ <-9.1; wherein, f ₄ is the effective focal length of one of the fourth lenses (in millimeters), and f ₆ is the effective focal length of one of the sixth lenses (in millimeters). millimeters).

The imaging lens satisfies the following conditions: 34<Vd ₅ -Vd ₆ <66; wherein, Vd ₅ is the Abbe coefficient of one of the fifth lenses, and Vd ₆ is the Abbe coefficient of one of the sixth lenses.

The imaging lens satisfies the following conditions: 2.5<Vd ₅ /Vd ₆ <4.5; wherein, Vd ₅ is the Abbe coefficient of one of the fifth lenses, and Vd ₆ is the Abbe coefficient of one of the sixth lenses.

The fifth lens and the sixth lens are cemented together.

The imaging lens of the present invention may further include a diaphragm disposed between the second lens and the fourth lens.

Another embodiment of the imaging lens of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens is a biconvex lens with positive refractive power. The sixth lens has negative refractive power and includes a concave surface facing the object side. The seventh lens has refractive power and is a meniscus lens. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged along an optical axis from the object side to the image side.

In order to make the above objects, features, and advantages of the present invention more clearly understood, preferred embodiments are hereinafter described in detail with the accompanying drawings.

1, 2: Imaging lens

L11, L21: The first lens

L12, L22: Second lens

L13, L23: The third lens

L14, L24: Fourth lens

L15, L25: Fifth lens

L16, L26: Sixth lens

L17, L27: seventh lens

L28: Eighth lens

ST1, ST2: Aperture

OF1, OF2: filter

OA1, OA2: Optical axis

IMA1, IMA2: Imaging plane

CG1, CG2: Protective glass

S11, S12, S13, S14, S15, S16, S17: Surface

S18, S19, S110, S111, S112, S113: Surface

S114, S115, S116, S117, S118: Surface

S21, S22, S23, S24, S25, S26, S27: face

S28, S29, S210, S211, S212, S213: Surface

S214, S215, S216, S217, S218: face

S219, S220: Noodles

FIG. 1 is a schematic diagram of a lens configuration and an optical path of a first embodiment of an imaging lens according to the present invention.

FIG. 2A is a field curvature diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 2B is a distortion diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 2C is a Modulation Transfer Function diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration and optical path of the second embodiment of the imaging lens according to the present invention.

FIG. 4A is a field curvature diagram of a second embodiment of the imaging lens according to the present invention.

FIG. 4B is a distortion diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 4C is a Modulation Transfer Function diagram of the second embodiment of the imaging lens according to the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of the lens configuration and optical path of the first embodiment of the imaging lens according to the present invention. The imaging lens 1 includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, a fourth lens L14, a Five lenses L15, a sixth lens L16, a seventh lens L17, a filter OF1 and a protective glass CG1. During imaging, the light from the object side is finally imaged on an imaging plane IMA1.

The first lens L11 is a meniscus lens with negative refractive power and is made of glass material Therefore, the object side S11 is convex, the image side S12 is concave, and both the object side S11 and the image side S12 are aspherical surfaces.

The second lens L12 is a meniscus lens with positive refractive power and is made of glass material. The object side S13 is concave, the image side S14 is convex, and both the object side S13 and the image side S14 are aspheric surfaces.

The third lens L13 is a biconvex lens with positive refractive power and is made of glass material. The object side S16 is convex, the image side S17 is convex, and both the object side S16 and the image side S17 are aspheric surfaces.

The fourth lens L14 is a meniscus lens with negative refractive power and is made of glass material. The object side S18 is concave, the image side S19 is convex, and both the object side S18 and the image side S19 are spherical surfaces.

The fifth lens L15 is a biconvex lens with positive refractive power and is made of glass material.

The sixth lens L16 is a meniscus lens with negative refractive power and is made of glass material. The object side S111 is concave, the image side S112 is convex, the object side S111 is a spherical surface, and the image side S112 is an aspheric surface.

The fifth lens L15 and the sixth lens L16 are cemented together.

The seventh lens L17 is a meniscus lens with positive refractive power and is made of glass material. The object side S113 is convex, the image side S114 is concave, and both the object side S113 and the image side S114 are aspheric surfaces.

The object side S115 and the image side S116 of the filter OF1 are both flat surfaces.

The object side S117 and the image side S118 of the protective glass CG1 are both flat

In addition, the imaging lens 1 in the first embodiment satisfies at least one of the following conditions: 0<f1 ₁ ×f1 ₆ <215 (1)

20<f1 ₃ ×f1 ₅ <30 (2)

-95<f1 ₅ ×f1 ₆ <0 (3)

-45<f1 ₁ +f1 ₆ <0 (4)

-15.5<f1 ₆ -f1 ₄ <-9.1 (5)

34<Vd1 ₅ -Vd1 ₆ <66 (6)

2.5<Vd1 ₅ /Vd1 ₆ <4.5 (7)

Wherein, f1 ₁ is an effective focal length of the first lens L11, f1 ₃ is an effective focal length of the third lens L13, f1 ₄ is an effective focal length of the fourth lens L14, f1 ₅ is an effective focal length of the fifth lens L15, f1 ₆ is an effective focal length of the sixth lens L16, Vd1 ₅ is an Abbe coefficient of the fifth lens L15, and Vd1 ₆ is an Abbe coefficient of the sixth lens L16.

Using the above-mentioned lens, aperture ST1, and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 1 can effectively shorten the total length of the lens, correct aberrations, improve resolution, and resist environmental temperature changes.

If the numerical value of the condition (3) f1 ₅ ×f1 ₆ is larger than 0, the function of correcting the aberration becomes poor. Therefore, the value of f1 ₅ ×f1 ₆ must be at least less than 0, so the best effect range is -95<f1 ₅ ×f1 ₆ <0, and meeting this range has the best correction conditions for aberrations and helps reduce sensitivity.

Table 1 is the relevant parameter table of each lens of the imaging lens 1 in Fig. 1. According to a data, the effective focal length of the imaging lens 1 of the first embodiment is equal to 5.588mm, the aperture value is equal to 2.0, the total length of the lens is equal to 18.0mm, and the field of view is equal to 84.6 degrees.

The aspheric surface concavity z of each lens in Table 1 is obtained by the following formula: z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ + Ch ⁸ +Dh ¹⁰ +Eh ¹²

Among them: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~E: aspheric coefficient.

Table 2 is a table of relevant parameters of the aspheric surfaces of each lens in Table 1, where k is the Conic Constant, and A~E are the aspheric coefficients.

Table 3 shows the parameter values in the conditions (1) to (7) and the calculated values of the conditions (1) to (7). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the conditions (1) to the requirements of condition (7).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements, which can be seen from Figs. 2A to 2C. FIG. 2A shows a field curvature diagram of the imaging lens 1 of the first embodiment. FIG. 2B shows a distortion diagram of the imaging lens 1 of the first embodiment. FIG. 2C shows a modulation transfer function (Modulation Transfer Function) diagram of the imaging lens 1 of the first embodiment.

It can be seen from Fig. 2A that the imaging lens 1 of the first embodiment has the wavelengths of 0.420 μm, 0.460 μm, 0.510 μm, 0.550 μm, 0.610 μm, and 0.650 μm. ) direction is between -0.08mm and 0.02mm.

It can be seen from Figure 2B (the 6 lines in the figure almost overlap, so that there is almost only one line), it can be seen that the imaging lens 1 of the first embodiment has wavelengths of 0.420 μm, 0.460 μm, 0.510 The distortion caused by light of 0.610μm and 0.650μm is between -7% and 0.5%.

It can be seen from Figure 2C that the imaging lens 1 of the first embodiment has a field height of 0.0000 in the meridional (Tangential) direction and the sagittal (Sagittal) direction for light with a wavelength range of 0.420 μm to 0.650 μm, respectively. mm, 0.3928rmm, 0.7857mm, 1.5713mm, 1.9642mm, 2.7498mm, 3.1426mm, 3.9283mm, the spatial frequency ranges from 0 lp/mm to 160 lp/mm, and the modulation transfer function value ranges from 0.46 to 1.0 .

It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a second practical example of the imaging lens according to the present invention Schematic diagram of lens configuration and optical path of the embodiment. The imaging lens 2 includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, a first lens L24, a first lens Five lenses L25, a sixth lens L26, an eighth lens L28, a seventh lens L27, a filter OF2 and a protective glass CG2. During imaging, the light from the object side is finally imaged on an imaging plane IMA2.

The first lens L21 is a meniscus lens with negative refractive power and is made of glass material. The object side S21 is convex, the image side S22 is concave, and both the object side S21 and the image side S22 are spherical surfaces.

The second lens L22 is a meniscus lens with negative refractive power and is made of glass material. The object side S23 is convex, the image side S24 is concave, and both the object side S23 and the image side S24 are aspheric surfaces.

The third lens L23 is a biconvex lens with positive refractive power and is made of glass material. The object side S25 is convex, the image side S26 is convex, and both the object side S25 and the image side S26 are aspheric surfaces.

The fourth lens L24 is a biconvex lens with positive refractive power and is made of glass material. The object side S28 is convex, the image side S29 is convex, and both the object side S28 and the image side S29 are aspheric surfaces.

The fifth lens L25 is a biconvex lens with positive refractive power and is made of glass material. The object side S210 is convex, the image side S211 is convex, and both the object side S210 and the image side S211 are spherical surfaces.

The sixth lens L26 is a double concave lens with negative refractive power and is made of glass material, the object side S211 is concave, the image side S212 is concave, and both the object side S211 and the image side S212 are is a spherical surface.

The fifth lens L25 and the sixth lens L26 are cemented together.

The eighth lens L28 is a biconvex lens with positive refractive power and is made of glass material. The object side S213 is convex, the image side S214 is convex, and both the object side S213 and the image side S214 are aspheric surfaces.

The seventh lens L27 is a meniscus lens with negative refractive power and is made of glass material. The object side S215 is concave, the image side S216 is convex, and both the object side S215 and the image side S216 are aspheric surfaces.

The object side S217 and the image side S218 of the filter OF2 are both flat surfaces.

The object side S219 and the image side S220 of the protective glass CG2 are both flat

In addition, the imaging lens 2 in the second embodiment satisfies at least one of the following conditions: 0<f2 ₁ ×f2 ₆ <215 (8)

20<f2 ₃ ×f2 ₅ <30 (9)

-95<f2 ₅ ×f2 ₆ <0 (10)

-45<f2 ₁ +f2 ₆ <0 (11)

-15.5<f2 ₆ -f2 ₄ <-9.1 (12)

34<DVD2 ₅ -DVD2 ₆ <66 (13)

2.5<Vd2 ₅ /Vd2 ₆ <4.5 (14)

The definitions of f2 ₁ , f2 ₃ , f2 ₄ , f2 ₅ , f2 ₆ , DVD2 ₅ and DVD2 ₆ above are the same as the definitions of f1 ₁ , f1 ₃ , f1 ₄ , f1 ₅ , f1 ₆ , DVD1 ₅ and DVD1 ₆ in the first embodiment The definitions are the same and will not be repeated here.

Using the above-mentioned lens, aperture ST2 and a design that satisfies at least one of the conditions (8) to (14), the imaging lens 2 can effectively shorten the total length of the lens, correct aberrations, improve resolution, and resist environmental temperature changes.

If the numerical value of condition (13) DVD2 ₅ -DVD2 ₆ is less than 34, the achromatic function will be inferior. Therefore, the value of DVD2 ₅ -DVD2 ₆ must be at least greater than 34, so the best effect range is 34<DVD2 ₅ -DVD2 ₆ <66, and meeting this range has the best achromatic condition.

Table 4 is the relevant parameter table of each lens of the imaging lens 2 in Figure 3. The data in Table 4 shows that the effective focal length of the imaging lens 2 of the second embodiment is equal to 4.294mm, the aperture value is equal to 2.0, the total length of the lens is equal to 18.725mm, The field of view is equal to 86 degrees.

The aspheric surface concavity z of each lens in Table 4 is obtained by the following formula: z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ + Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Among them: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 5 is a table of relevant parameters of the aspheric surfaces of each lens in Table 4, where k is the Conic Constant, and A~G is the aspheric coefficient.

Table 6 shows the parameter values in the conditions (8) to (14) and the calculated values of the conditions (8) to (14). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the conditions (8) to the requirements of condition (14).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements, which can be seen from FIGS. 4A to 4C . FIG. 4A shows a field curvature diagram of the imaging lens 2 according to the second embodiment. FIG. 4B shows a distortion diagram of the imaging lens 2 of the second embodiment. FIG. 4C shows a modulation transfer function diagram of the imaging lens 2 according to the second embodiment.

It can be seen from Fig. 4A that the imaging lens 2 of the second embodiment has the wavelengths of 0.420 μm, 0.460 μm, 0.510 μm, 0.550 μm, 0.610 μm, and 0.650 μm. ) direction is between -0.025mm and 0.09mm.

It can be seen from Figure 4B (the 6 lines in the figure almost overlap, so that there is almost only one line), it can be seen that the imaging lens 2 of the second embodiment has wavelengths of 0.420 μm, 0.460 μm, 0.510 μm, 0.550 The distortion caused by light of 0.610μm and 0.650μm is between -11% and 0%.

It can be seen from Fig. 4C that the imaging lens 2 of the second embodiment has a field of view angle of 0.00 in the tangential direction and the sagittal direction for light with a wavelength range of 0.420 μm to 0.650 μm, respectively. degrees, 5.40 degrees, 10.67 degrees, 20.70 degrees, 25.15 degrees, 33.13 degrees, 36.75 degrees, 43.40 degrees, the spatial frequency ranges from 0 lp/mm to 160 lp/mm, and the modulation transfer function value ranges from 0.47 to 1.0.

It is obvious that the field curvature and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

The formulas conformed by the present invention are centered on -95<f ₅ ×f ₆ <0, 34<Vd ₅ -Vd ₆ <66, and the numerical values of the embodiments of the present invention also fall within the ranges of other formulas. The formula -95<f ₅ ×f ₆ <0 can make the overall aberration correction performance helpful. The formula 34<Vd2 ₅ -Vd2 ₆ <66 can make the achromatic performance better.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

1: Imaging lens

L11: The first lens

L12: Second lens

L13: Third lens

L14: Fourth lens

L15: Fifth lens

L16: Sixth lens

L17: Seventh lens

ST1: Aperture

OF1: filter

OA1: Optical axis

IMA1: Imaging plane

CG1: Protective glass

S11, S12, S13, S14, S15, S16, S17: Surface

S18, S19, S110, S111, S112, S113: Surface

S114, S115, S116, S117, S118: Surface

Claims (13)

An imaging lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with refractive power; a third lens with positive refractive power, the third lens includes a convex surface facing an object side A fourth lens has refractive power, and the fourth lens includes a convex surface toward an image side; a fifth lens has positive refractive power, and the fifth lens includes a convex surface toward the image side; a sixth lens has negative refractive power, the first The six lenses include a concave surface facing the object side; and a seventh lens having refractive power, the seventh lens is a meniscus lens; wherein the first lens, the second lens, the third lens, the fourth lens, the The fifth lens, the sixth lens and the seventh lens are sequentially arranged along an optical axis from the object side to the image side; wherein the refractive power of the second lens is opposite to the refractive power of the fourth lens; wherein the imaging lens The following conditions are met: 20<f ₃ ×f ₅ <30; wherein, f ₃ is an effective focal length of the third lens, and f ₅ is an effective focal length of the fifth lens. The imaging lens of claim 1, wherein: the second lens has a positive refractive power, including a concave surface facing the object side and a convex surface facing the image side; and the fourth lens has a negative refractive power, further including a The concave surface faces the object side. The imaging lens of claim 2, wherein: the sixth lens further includes a convex surface facing the image side; and the seventh lens includes a convex surface facing the object side and a concave surface facing the image side. The imaging lens of claim 1, wherein: the second lens has a negative refractive power, including a convex surface facing the object side and a concave surface facing the image side; and the fourth lens has a positive refractive power, further including another A convex surface faces the object side. The imaging lens of claim 4, wherein: the sixth lens further includes another concave surface facing the image side; and the seventh lens includes a convex surface facing the image side. The imaging lens of claim 1, further comprising an eighth lens disposed between the fifth lens and the image side. The imaging lens of claim 6, wherein the eighth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. An imaging lens comprising: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having positive refractive power, the second lens comprising a concave surface facing an object side and a convex surface facing an image side A third lens has positive refractive power, and the third lens includes a convex surface toward the object side; a fourth lens has negative refractive power, and the fourth lens includes a concave surface toward the object side and a convex surface toward the image side; a first Five lenses have positive refractive power, the fifth lens includes a convex surface facing the image side; a sixth lens has negative refractive power, the sixth lens includes a concave surface facing the object side; and a seventh lens has refractive power; The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are in sequence from the object side to the image side along an optical axis Arrangement; wherein the refractive power of the second lens is opposite to the refractive power of the fourth lens. An imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens comprising a convex surface facing an object side and a concave surface facing an image side A third lens has positive refractive power, and the third lens includes a convex surface toward the object side; a fourth lens has positive refractive power, and the fourth lens includes a convex surface toward the object side and another convex surface toward the image side; a The fifth lens has positive refractive power, the fifth lens includes a convex surface facing the image side; a sixth lens has negative refractive power, the sixth lens includes a concave surface facing the object side; and a seventh lens has refractive power; A lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged along an optical axis from the object side to the image side; wherein The refractive power of the second lens is opposite to that of the fourth lens. An imaging lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with refractive power; a third lens with positive refractive power, the third lens includes a convex surface facing an object side A fourth lens has refractive power, and the fourth lens includes a convex surface toward an image side; a fifth lens has positive refractive power, and the fifth lens includes a convex surface toward the image side; A sixth lens has negative refractive power, the sixth lens includes a concave surface facing the object side; and a seventh lens has refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the The fifth lens, the sixth lens and the seventh lens are sequentially arranged along an optical axis from the object side to the image side; wherein the refractive power of the second lens is opposite to the refractive power of the fourth lens; which further includes a The eighth lens is disposed between the fifth lens and the image side. The eighth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The imaging lens of any one of claims 1 to 10, wherein: the first lens includes a convex surface facing the object side and a concave surface facing the image side; the third lens further includes another convex surface facing the image side; and the fifth lens further includes another convex surface facing the object side. The imaging lens according to any one of claims 1 to 10 of the claimed scope, further comprising an aperture, disposed between the second lens and the fourth lens, and the fifth lens and the sixth lens are cemented. The imaging lens according to any one of claims 1 to 10, wherein the imaging lens satisfies the following conditions: -95<f ₅ ×f ₆ <0;0<f ₁ ×f ₆ <215; -45 <f ₁ +f ₆ <0;-15.5<f ₆ -f ₄ <-9.1;34<Vd ₅ -Vd ₆ <66;2.5<Vd ₅ /Vd ₆ <4.5; wherein, f ₁ is the first lens an effective focal length, _f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the _fifth lens, f6 is an effective focal length of the _sixth lens, and Vd5 is one of the _fifth lenses Abbe coefficient, Vd ₆ is one of the Abbe coefficients of the sixth lens.

Images