TW202028800A - 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. The second lens is with negative refractive power. The third lens is with positive refractive power. The fourth lens is with positive refractive power. The fifth lens is with positive refractive power. The sixth lens is with negative refractive power. The seventh lens is with 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 arranged in order from the object side to an image side along an optical axis. The lens assembly satisfies: 0.1 < |f₂/f| < 2.2; wherein f₂ is an effective focal length of the second lens and f is an effective focal length of the lens assembly.

Description

Imaging lens (29)

The invention relates to an imaging lens.

The development trend of today's imaging lenses, in addition to the continuous development towards miniaturization, with different application requirements, it also needs to have a large aperture, high resolution and the ability to resist changes in ambient temperature. The conventional imaging lenses can no longer meet the current requirements. Demands require another imaging lens with a new architecture to meet the needs of miniaturization, large aperture, high resolution, and resistance to environmental temperature changes.

In view of this, the main purpose of the present invention is to provide an imaging lens which has a shorter overall lens length, smaller aperture value, higher resolution, 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 an object side. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. 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 arranged in order from the object side to the image side along an optical axis. The imaging lens satisfies the following conditions: 0.1<|f ₂ /f|<2.2; where f ₂ is an effective focal length of the second lens, and f is an effective focal length of the imaging lens.

Another 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 an object side. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. 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 arranged in order from the object side to the image side along an optical axis. The imaging lens meets the following conditions: 0.3<|f ₆ /f|<1.2; where f ₆ is an effective focal length of the sixth lens, and f is an effective focal length of the imaging lens.

The second lens and the third lens are cemented, and the fifth lens and the sixth lens are cemented.

The first lens may further include a concave surface facing the image side, the second lens includes a concave surface facing the object side, the third lens includes a convex surface facing the image side, and the fourth lens is a biconvex lens including a convex surface facing the object side and another convex surface Facing the image side, the fifth lens includes a convex surface facing the object side, the sixth lens includes a concave surface facing the image side, and the seventh lens may further include a convex surface facing the image side.

The second lens may further include a concave surface facing the image side, the third lens may further include a convex surface facing the object side, the fifth lens may further include a convex surface facing the image side, and the sixth lens may further include a concave surface facing the object side.

The second lens may further include a convex surface facing the image side, the third lens may further include a concave surface facing the object side, the fifth lens may further include a concave surface facing the image side, and the sixth lens may further include a convex surface facing the object side.

The imaging lens satisfies the following conditions: 2.2<|f ₁ /f|<4.2; where f ₁ is an effective focal length of the first lens, and f is an effective focal length of the imaging lens.

The imaging lens satisfies the following conditions: 0.5<|f ₄ /f|<2.6; where f ₄ is an effective focal length of the fourth lens, and f is an effective focal length of the imaging lens.

The imaging lens satisfies the following conditions: 0.9<|f ₇ /f|<3.1; among them, f ₇ is an effective focal length of the seventh lens, and f is an effective focal length of the imaging lens.

The imaging lens satisfies the following conditions: 0.1<BFL/TTL<0.4; 0.3<f/TTL<0.4; Among them, BFL is the distance between the image side of the seventh lens and the imaging surface on the optical axis, and TTL is the first The distance between the object side of the lens and the imaging surface on the optical axis, f is an effective focal length of the imaging lens.

In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following specifically describes preferred embodiments in conjunction with the accompanying drawings.

1, 2‧‧‧ Imaging lens

L11、L21‧‧‧First lens

L12、L22‧‧‧Second lens

L13, L23‧‧‧third lens

L14, L24‧‧‧Fourth lens

L15、L25‧‧‧Fifth lens

L16、L26‧‧‧Sixth lens

L17、L27‧‧‧Seventh lens

ST1, ST2‧‧‧Aperture

OF1, OF2‧‧‧Filter

CG1、CG2‧‧‧Protection glass

OA1, OA2‧‧‧Optical axis

IMA1, IMA2‧‧‧imaging surface

S11, S21‧‧‧Object side of the first lens

S12, S22‧‧‧The side of the first lens image

S13, S23‧‧‧Object side of the second lens

S14, S24‧‧‧Second lens image side (third lens object side)

S15, S25‧‧‧Third lens image side

S16、S26‧‧‧Aperture surface

S17, S27‧‧‧Object side of the fourth lens

S18, S28‧‧‧Fourth lens image side

S19, S29‧‧‧Fifth lens object side

S110, S210‧‧‧Fifth lens image side (6th lens object side)

S111, S211‧‧‧Sixth lens image side

S112, S212‧‧‧Seventh lens object side

S113, S213‧‧‧Seventh lens image side

S114, S214‧‧‧The side of the filter object

S115, S215‧‧‧Filter image side

S116, S216‧‧‧Protect the side of the glass object

S117, S217‧‧‧Protect the side of the glass image

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

Figure 2A is a Longitudinal Aberration diagram of the first embodiment of the imaging lens according to the present invention.

Fig. 2B is a field curve diagram of the first embodiment of the imaging lens according to the present invention.

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

The 2D image is a Lateral Color image of the first embodiment of the imaging lens according to the present invention.

Fig. 2E is a Relative Illumination diagram of the first embodiment of the imaging lens according to the present invention.

Figure 2F is a diagram of Modulation Transfer Function (Modulation Transfer Function) of the first embodiment of the imaging lens according to the present invention.

Figure 2G is a Through Focus 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 of the second embodiment of the imaging lens according to the present invention.

Fig. 4A is a longitudinal aberration diagram of the second embodiment of the imaging lens according to the present invention.

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

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

Fig. 4D is a lateral chromatic aberration diagram of the second embodiment of the imaging lens according to the present invention.

Fig. 4E is a relative illumination (Relative Illumination) diagram of the second embodiment of the imaging lens according to the present invention.

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

Fig. 4G is a Through Focus Modulation Transfer Function diagram of the second embodiment of the imaging lens according to the present invention.

The present invention provides an imaging lens comprising: a first lens with negative refractive power, the first lens including a convex surface facing an object side; a second lens with negative refractive power; a third lens with positive refractive power; and a fourth lens with Positive refractive power; a fifth lens with positive refractive power; a sixth lens with negative refractive power; and a seventh lens with positive refractive power, the seventh lens includes a convex surface facing the object side; wherein the first lens, the second lens, and the third lens The 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; the imaging lens satisfies the following conditions: 0.1<|f ₂ /f|<2.2 ; Among them, f ₂ is an effective focal length of the second lens, and f is an effective focal length of the imaging lens.

The present invention provides another imaging lens, including: a first lens with negative refractive power, the first lens including a convex surface facing an object side; a second lens with negative refractive power; a third lens with positive refractive power; and a fourth lens Has positive refractive power; a fifth lens has positive refractive power; a sixth lens has negative refractive power; and a seventh lens has positive refractive power. The seventh lens includes a convex surface facing the object side; wherein the first lens, the second lens, and the The three lenses, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis; the imaging lens meets the following conditions: 0.3<|f ₆ /f|<1.2; Among them, f ₆ is an effective focal length of the sixth lens, and f is an effective focal length of the imaging lens.

Please refer to Table 1, Table 2, Table 4, and Table 5 below. Table 1 and Table 4 are related parameter tables of each lens of the first embodiment and the second embodiment of the imaging lens according to the present invention. Table 2 and Table 5 is a table of relevant parameters of the aspheric surface of each lens in Table 1 and Table 4.

Figures 1 and 3 are respectively schematic diagrams of the lens configuration of the first and second embodiments of the imaging lens of the present invention. The first lenses L11 and L21 have negative refractive power and are made of glass. The object side surfaces S11 and S21 are convex surfaces, and the object side surfaces S11 and S21 and the image side surfaces S12 and S22 are all spherical surfaces.

The second lenses L12 and L22 have negative refractive power and are made of glass, and the object side surfaces S13 and S23 and the image side surfaces S14 and S24 are all spherical surfaces.

The third lenses L13 and L23 have positive refractive power and are made of glass material, and the object side surfaces 514 and S24 and the image side surfaces S15 and S25 are spherical surfaces.

The second lenses L12 and L22 are cemented with the third lenses L13 and L23, respectively.

The fourth lens L14, L24 has positive refractive power and is made of glass material, and the object side surfaces S17, S27 and the image side surfaces S18, S28 are all aspherical surfaces.

The fifth lenses L15 and L25 have positive refractive power and are made of glass, and the object side surfaces S19 and S29 and the image side surfaces S110 and S210 are all spherical surfaces.

The sixth lenses L16 and L26 have negative refractive power and are made of glass, and the object side surfaces S110 and S210 and the image side surfaces S111 and S211 are spherical surfaces.

The fifth lens L15, L25 is cemented with the sixth lens L16, L26, respectively.

The seventh lenses L17 and L27 have positive refractive power and are made of glass. The object side surfaces S112 and S212 are convex surfaces, and the object side surfaces S112 and S212 and the image side surfaces S113 and S213 are aspherical surfaces.

In addition, the imaging lenses 1 and 2 meet at least one of the following conditions: 0.1<|f ₂ /f|<2.2 (1)

0.3<|f ₆ /f|<1.2 (2)

2.2<|f ₁ /f|<4.2 (3)

0.5<|f ₄ /f|<2.6 (4)

0.9<|f ₇ /f|<3.1 (5)

0.1<BFL/TTL<0.4 (6)

0.3<f/TTL<0.4 (7)

Where f is the effective focal length of one of the imaging lenses 1 and 2 in the first embodiment to the second embodiment, and f ₁ is the effective focal length of one of the first lenses L11 and L21 in the first embodiment to the second embodiment, f ₂ is the effective focal length of one of the second lenses L12 and L22 in the first embodiment to the second embodiment, f ₄ is the effective focal length of one of the fourth lenses L14 and L24 in the first embodiment to the second embodiment, f ₆ is the effective focal length of one of the sixth lenses L16 and L26 in the first embodiment to the second embodiment, f ₇ is the effective focal length of one of the seventh lenses L17 and L27 in the first embodiment to the second embodiment, BFL is a distance between the image sides S113 and S213 of the seventh lens L17, L27 and the imaging surfaces IMA1 and IMA2 on the optical axes OA1 and OA2 in the first to second embodiments, and TTL is from the first embodiment to In the second embodiment, the object side surfaces S11 and S21 of the first lenses L11 and L21 are spaced from the imaging surfaces IMA1 and IMA2 on the optical axes OA1 and OA2, respectively. The imaging lenses 1 and 2 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, effectively resist environmental temperature changes, and effectively correct aberrations.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 1, the imaging lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a first lens L11, a second lens L12, a third lens L13, a second lens L11, a second lens L11, a second lens L11, a third lens Four lenses L14, a fifth lens L15, a sixth lens L16, a seventh lens L17, a filter OF1 and a protective glass CG1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to paragraphs 1 to 12 of the [Embodiment Mode], wherein: the first lens L11 may be a meniscus lens with a concave image side surface S12; The second lens L12 can be a biconcave lens, the object side S13 is concave and the image side S14 is concave; the third lens L13 can be a biconvex lens, the object side S14 is convex, and the image side S15 is convex; the fourth lens L14 It can be a biconvex lens, the object side S17 is convex, and the image side S18 is convex; the fifth lens L15 can be a biconvex lens, the object side S19 is convex, and the image side S110 is convex; the sixth lens L16 can be more double Concave lens, the object side S110 is concave, the image side S111 is concave; the seventh lens L17 can be a biconvex lens, the image side S113 is convex; the object side S114 and the image side S115 of the filter OF1 are both flat surfaces; protective glass The object side S116 and the image side S117 of CG1 are both flat.

Using the above-mentioned lens, aperture ST1, and a design that meets at least one of the conditions (1) to (7), the imaging lens 1 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Resistance to environmental temperature changes, effective correction of chromatic aberration, and effective correction of aberration.

Table 1 is a table of related parameters of each lens of the imaging lens 1 in Figure 1. The data in Table 1 shows that the effective focal length of the imaging lens 1 of the first embodiment is equal to 9.659mm, the aperture value is equal to 1.8, and the total lens length is equal to 29.914mm, The vertical field of view is equal to 26.7 degrees.

The concavity z of the aspheric surface 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

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

Table 2 is the relevant parameter table of the aspheric surface of each lens in Table 1, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 3 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (7). From Table 3, it can be seen that the imaging lens 1 of the first embodiment can all satisfy the condition (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. This can be seen from Figures 2A to 2G. FIG. 2A shows a longitudinal aberration (Longitudinal Aberration) diagram of the imaging lens 1 of the first embodiment. FIG. 2B shows a field curvature diagram of the imaging lens 1 of the first embodiment. Figure 2C shows a distortion (distortion) diagram of the imaging lens 1 of the first embodiment. FIG. 2D shows the lateral chromatic aberration (Lateral Color) diagram of the imaging lens 1 of the first embodiment. FIG. 2E shows the relative illumination (Relative Illumination) diagram of the imaging lens 1 of the first embodiment. FIG. 2F shows a Modulation Transfer Function (Modulation Transfer Function) diagram of the imaging lens 1 of the first embodiment. Figure 2G shows the Through Focus Modulation Transfer Function (Through Focus 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 a longitudinal aberration (Longitudinal Aberration) between -0.03 mm and 0.02 mm.

It can be seen from FIG. 2B that the field curvature of the imaging lens 1 of the first embodiment is between -0.02mm and 0.03mm.

It can be seen from FIG. 2C that the distortion (Distortion) of the imaging lens 1 of the first embodiment is between -5% and 0%.

It can be seen from Fig. 2D that the lateral chromatic aberration (Lateral Color) of the imaging lens 1 of the first embodiment is between 0 μm and 4 μm.

It can be seen from Fig. 2E that the relative illumination of the imaging lens 1 of the first embodiment is between 0.84 and 1.0.

It can be seen from FIG. 2F that the value of the Modulation Transfer Function of the imaging lens 1 of the first embodiment is between 0.42 and 1.0.

It can be seen from Figure 2G that the imaging lens 1 of the first embodiment, when the focus is shifted The value of the modulation transfer function between -0.05mm and 0.05mm is between 0 and 0.8.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected. Relative Illumination, lens Resolution (Resolution) and Depth of Focus (Depth of Focus) can also meet the requirements, resulting in better optical performance.

Please refer to FIG. 3, which is a schematic diagram of the lens configuration of the second embodiment of the imaging lens according to the present invention. The imaging lens 2 includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24 and a Five lenses L25, a sixth lens L26, a seventh lens L27, a filter OF2 and a protective glass CG2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to twelfth paragraphs of the [Embodiment Mode], the surface shape of the first lens L21 is similar to that of the first lens L11 in the first embodiment, and will not be repeated here; the second lens L22 can be more curved A lunar lens, the object side S23 is concave, and the image side S24 is convex; the third lens L23 can be a meniscus lens, the object side S24 is concave, and the image side S25 is convex; the fourth lens L24 has a concave-convex surface shape It is similar to the fourth lens L14 in the first embodiment and will not be repeated here; the fifth lens L25 can be a meniscus lens, the object side surface S29 is convex, and the image side surface S210 is concave; the sixth lens L26 can be More meniscus lens, the object side surface S210 is convex surface, and the image side surface S211 is concave surface; the surface shape of the seventh lens L27 is similar to the seventh lens L17 in the first embodiment, and will not be repeated here; The object side surface S214 and the image side surface S215 of the sheet OF2 are both flat; the protective glass CG2 has the object side surface S216 and the image side surface S217 both flat.

Using the above-mentioned lens, aperture ST2, and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 2 can effectively shorten the total length of the lens, effectively reduce the aperture value, effectively improve the resolution, and effectively Resistance to environmental temperature changes, effective correction of chromatic aberration, and effective correction of aberration.

Table 4 is the related 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 9.200mm, the aperture value is equal to 1.8, and the total lens length is equal to 24.95mm, The vertical field of view is equal to 26.7 degrees.

The definition of the aspheric surface concavity z of each lens in Table 4 is the same as the definition of the aspheric surface concavity z of each lens in Table 1 in the first embodiment, and will not be repeated here.

Table 5 is the relevant parameter table of the aspheric surface of each lens in Table 4, where k is the Conic Constant and A~G are the aspheric coefficients.

Table 6 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (7). From Table 6, it can be seen that the imaging lens 2 of the second embodiment can all satisfy the condition (1). ) To the requirements of condition (7).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements, which can be seen from Figures 4A to 4G. FIG. 4A shows a longitudinal aberration diagram of the imaging lens 2 of the second embodiment. FIG. 4B shows a field curve of the imaging lens 2 of the second embodiment. Figure 4C shows a distortion (distortion) diagram of the imaging lens 2 of the second embodiment. FIG. 4D shows the lateral chromatic aberration (Lateral Color) diagram of the imaging lens 2 of the second embodiment. FIG. 4E shows the relative illumination (Relative Illumination) diagram of the imaging lens 2 of the second embodiment. Figure 4F shows a Modulation Transfer Function (Modulation Transfer Function) diagram of the imaging lens 2 of the second embodiment. FIG. 4G shows the Through Focus Modulation Transfer Function (Through Focus Modulation Transfer Function) diagram of the imaging lens 2 of the second embodiment.

It can be seen from FIG. 4A that the imaging lens 2 of the second embodiment has a longitudinal aberration (Longitudinal Aberration) between -0.04 mm and 0.02 mm.

It can be seen from Fig. 4B that the field curvature of the imaging lens 2 of the second embodiment (Field Curvature) is between -0.06mm to 0.04mm.

It can be seen from FIG. 4C that the distortion (Distortion) of the imaging lens 2 of the second embodiment is between -5% and 0%.

It can be seen from FIG. 4D that the lateral chromatic aberration (Lateral Color) of the imaging lens 2 of the second embodiment is between -1 μm and 2.5 μm.

It can be seen from Fig. 4E that the relative illumination of the imaging lens 2 of the second embodiment is between 0.82 and 1.0.

It can be seen from Fig. 4F that the value of the Modulation Transfer Function of the imaging lens 2 of the second embodiment is between 0.50 and 1.0.

It can be seen from Fig. 2G that the imaging lens 2 of the second embodiment has a modulation transfer function value between 0 and 0.8 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the Longitudinal Aberration, Field Curvature, Distortion and Lateral Color of the imaging lens 2 of the second embodiment can be effectively corrected. Relative Illumination, Lens Resolution (Resolution) and Depth of Focus (Depth of Focus) can also meet the requirements, resulting in better optical performance.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone 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 subject to the scope of the attached patent application.

1‧‧‧Imaging lens

L11‧‧‧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‧‧‧Image surface

CG1‧‧‧Protection glass

S11‧‧‧Object side of the first lens

S12‧‧‧First lens image side

S13‧‧‧Object side of second lens

S14‧‧‧Second lens image side (third lens object side)

S15‧‧‧Third lens image side

S16‧‧‧Aperture surface

S17‧‧‧Fourth lens object side

S18‧‧‧Fourth lens image side

S19‧‧‧Fifth lens object side

S110‧‧‧Fifth lens image side (6th lens object side)

S111‧‧‧Sixth lens image side

S112‧‧‧Seventh lens object side

S113‧‧‧Seventh lens image side

S114‧‧‧The side of the filter object

S115‧‧‧Filter image side

S116‧‧‧Protect the side of the glass object

S117‧‧‧Protect the side of the glass image

Claims (10)

An imaging lens comprising: a first lens with negative refractive power, the first lens including a convex surface facing an object side; a second lens with negative refractive power; a third lens with positive refractive power; and a fourth lens with positive refractive power; A fifth lens has positive refractive power; a sixth lens has negative refractive power; and a seventh lens has positive refractive power, and the seventh lens includes a convex surface facing the object side; wherein the first lens, the second lens, and the first lens The three lenses, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to an image side along an optical axis; wherein the imaging lens satisfies the following conditions: 0.1<| f ₂ /f|<2.2; where f _{2 is} an effective focal length of the second lens, and f is an effective focal length of the imaging lens. An imaging lens comprising: a first lens with negative refractive power, the first lens including a convex surface facing an object side; a second lens with negative refractive power; a third lens with positive refractive power; and a fourth lens with positive refractive power; A fifth lens has positive refractive power; a sixth lens has negative refractive power; and a seventh lens has positive refractive power, and the seventh lens includes a convex surface facing the object side; wherein the first lens, the second lens, and the first lens The three lenses, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to an image side along an optical axis; wherein the imaging lens satisfies the following conditions: 0.3<| f ₆ /f|<1.2; where f _{6 is} an effective focal length of the sixth lens, and f is an effective focal length of the imaging lens. The imaging lens described in item 1 or item 2 of the scope of patent application, wherein the second lens and the third lens are cemented, and the fifth lens and the sixth lens are cemented. The imaging lens described in item 1 or item 2 of the scope of patent application, wherein: the first lens further includes a concave surface facing the image side; the second lens includes a concave surface facing the object side; the third lens includes a The convex surface faces the image side; the fourth lens is a biconvex lens, including a convex surface facing the object side and another convex surface facing the image side; the fifth lens includes a convex surface facing the object side; the sixth lens includes a concave surface facing The image side; and the seventh lens further includes a convex surface facing the image side. The imaging lens according to claim 4, wherein: the second lens further includes a concave surface facing the image side; the third lens further includes a convex surface facing the object side; the fifth lens further includes a convex surface facing The image side; and the sixth lens further includes a concave surface facing the object side. The imaging lens described in item 4 of the scope of patent application, in which: The second lens further includes a convex surface facing the image side; the third lens further includes a concave surface facing the object side; the fifth lens further includes a concave surface facing the image side; and the sixth lens further includes a convex surface facing the Object side. For example, the imaging lens described in item 1 or item 2 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 2.2<|f ₁ /f|<4.2; where f _{1 is} an effective focal length of the first lens, f is an effective focal length of the imaging lens. For example, the imaging lens described in item 1 or item 2 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 0.5<|f ₄ /f|<2.6; where f _{4 is} an effective focal length of the fourth lens, f is an effective focal length of the imaging lens. For example, the imaging lens described in item 1 or item 2 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 0.9<|f ₇ /f|<3.1; where f _{7 is} an effective focal length of the seventh lens, f is an effective focal length of the imaging lens. Such as the imaging lens described in item 1 or item 2 of the scope of patent application, wherein the imaging lens meets the following conditions: 0.1<BFL/TTL<0.4; 0.3<f/TTL<0.4; Wherein, BFL is a distance from an image side of the seventh lens to an imaging surface on the optical axis, TTL is a distance from an object side of the first lens to the imaging surface on the optical axis, f is One of the effective focal lengths of the imaging lens.

Images