TWI733191B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is with refractive power and includes a convex surface facing an object side. The second lens is with positive refractive power. The third lens is with positive refractive power. The fourth lens is with refractive power. The fifth lens is with refractive power. The sixth 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, and the sixth lens are arranged in order from the object side to an image side along an optical axis. The lens assembly satisfies the following condition: 0.2 < |f₅/f| < 1.5; wherein f₅ is an effective focal length of the fifth lens and f is an effective focal length of the lens assembly.

Description

Imaging lens (39)

The invention relates to an imaging lens.

The development trend of today's imaging lenses, in addition to the continuous development towards large apertures, with different application requirements, they also need to have high resolution and resistance to environmental temperature changes. Conventional imaging lenses can no longer meet today's needs. There is another imaging lens with a new architecture that can simultaneously meet the needs of 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 with a smaller aperture value, higher resolution, resistance to environmental temperature changes, but still having good optical performance.

The present invention provides an imaging lens including: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth 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 and the sixth lens are arranged in order from the object side to the image side along an optical axis. The imaging lens satisfies the following conditions: 0.2<|f ₅ /f|<1.5; where f ₅ is an effective focal length of the fifth lens, and f is an effective focal length of the imaging lens.

The present invention provides another imaging lens, including: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens has refractive power and includes a convex surface facing an object side. The second lens has positive refractive power. The third lens has positive refractive power. The fourth lens has refractive power. The fifth lens has refractive power. The sixth 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 and the sixth lens are arranged in order from the object side to the image side along an optical axis. The imaging lens satisfies the following conditions: 4.5mm<f+f ₄ <5.7mm; where f _{4 is} an effective focal length of the fourth lens, and f is an effective focal length of the imaging lens.

The first lens has negative refractive power and may further include a concave surface facing the image side. The second lens includes a convex surface facing the object side and another convex surface facing the image side. The third lens includes a convex surface facing the object side and a concave surface facing the image side. The fourth lens has negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The sixth lens may further include a convex surface Towards the image side.

The first lens has negative refractive power and may further include a concave surface facing the image side. The second lens includes a convex surface facing the object side and another convex surface facing the image side. The third lens includes a convex surface facing the object side and a concave surface facing the image side. The fourth lens has negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The fifth lens has positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The sixth lens may further include a flat surface. Towards the image side.

The fourth lens and the fifth lens are cemented together.

The imaging lens satisfies the following conditions: 0.8<|f ₁ /f|<2.9 _{; 0.5<|f 2} /f|<2.6; where f ₁ is one of the effective focal lengths of the first lens, and f ₂ is one of the second lenses Effective focal length, f is one of the effective focal lengths of the imaging lens.

The imaging lens satisfies the following conditions: 0.2<|f ₄ /f|<1.5 _{; 0.3<|f 6} /f|<2.4; among them, f ₄ is one of the effective focal lengths of the fourth lens, and f ₆ is one of the sixth lenses Effective focal length, f is one of the effective focal lengths of the imaging lens.

The imaging lens satisfies the following conditions: 0.1<|BFL/TTL|<0.6; among them, BFL is the distance from the image side of the sixth lens to the image surface on the optical axis, and TTL is the distance from the object side of the first lens to the A distance between the imaging surface and the optical axis.

The imaging lens satisfies the following conditions: -10mm<f+f ₁ <-7mm;24mm<f+f ₂ <25mm; where f ₁ is an effective focal length of the first lens and f ₂ is an effective focal length of the second lens , F is one of the effective focal lengths of the imaging lens.

The imaging lens satisfies the following conditions: 103.7mm<f+f ₃ <199.8mm;4.5mm<f+f ₄ <5.7mm; among them, f ₃ is one of the effective focal lengths of the third lens, and f ₄ is one of the fourth lenses Effective focal length, f is one of the effective focal lengths of the imaging lens.

The imaging lens meets the following conditions: 14.5mm<f+f ₅ <15mm;21.2mm<f+f ₆ <23.6mm; among them, f ₅ is one of the effective focal lengths of the fifth lens, and f ₆ is one of the effective focal lengths of the sixth lens Focal length, f is one of the effective focal lengths of the imaging lens.

In order to make the above-mentioned objectives, features, and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

1, 2, 3‧‧‧imaging lens

L11, L21, L31‧‧‧First lens

L12, L22, L32‧‧‧Second lens

L13, L23, L33‧‧‧third lens

L14, L24, L34‧‧‧Fourth lens

L15, L25, L35‧‧‧Fifth lens

L16, L26, L36‧‧‧Sixth lens

ST1, ST2, ST3‧‧‧Aperture

OA1, OA2, OA3‧‧‧Optical axis

OF1, OF2, OF3‧‧‧Filter

CG1, CG3‧‧‧protective glass

IMA1, IMA2, IMA3‧‧‧imaging surface

S11, S21, S31‧‧‧Object side of the first lens

S12, S22, S32‧‧‧The side of the first lens image

S13, S23, S33‧‧‧Object side of the second lens

S14, S24, S34‧‧‧Second lens image side

S15, S25, S35‧‧‧Object side of the third lens

S16, S26, S36‧‧‧Third lens image side

S17, S27, S37‧‧‧Aperture surface

S18, S28, S38‧‧‧Object side of the fourth lens

S19, S29, S39‧‧‧Image side of the fourth lens (object side of the fifth lens)

S110, S210, S310‧‧‧Fifth lens image side

S111, S211, S311‧‧‧Sixth lens object side

S112, S212, S312‧‧‧Sixth lens image side

S113, S213, S313‧‧‧The side of the filter object

S114, S214, S314‧‧‧Filter image side

S115, S315‧‧‧Protect the side of the glass object

S116, S316‧‧‧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.

Figure 2B is a Field Curvature diagram of the first embodiment of the imaging lens according to the present invention.

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

The 2D diagram is a diagram of the lateral chromatic aberration (Lateral Color) of the first embodiment of the imaging lens according to the present invention.

Figure 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 contrast diagram of the second embodiment of the imaging lens according to the present invention.

Figure 4F is a diagram of the modulation transfer function of the second embodiment of the imaging lens according to the present invention.

Fig. 4G is a diagram of the defocus modulation transfer function of the second embodiment of the imaging lens according to the present invention.

FIG. 5 is a schematic diagram of the lens configuration of the third embodiment of the imaging lens according to the present invention.

Fig. 6A is a longitudinal aberration diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6B is a field curvature diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6C is a distortion diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6D is a lateral chromatic aberration diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6E is a relative contrast diagram of the third embodiment of the imaging lens according to the present invention.

Figure 6F is a diagram of the modulation transfer function of the third embodiment of the imaging lens according to the present invention.

Figure 6G is a diagram of the defocus modulation transfer function of the third embodiment of the imaging lens according to the present invention.

The present invention provides an imaging lens comprising: a first lens having refractive power, the first lens including a convex surface facing an object side; a second lens having positive refractive power; a third lens having positive refractive power; and a fourth lens having refractive power ; A fifth lens has refractive power; and a sixth lens has positive refractive power, the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the first lens The six lenses are arranged in order from the object side to the image side along an optical axis; the imaging lens satisfies the following conditions: 0.2<|f ₅ /f|<1.5; where f ₅ is the effective focal length of the fifth lens, f One of the effective focal lengths of the imaging lens.

The present invention provides another imaging lens, including: a first lens with refractive power, the first lens including a convex surface facing an object side; a second lens with positive refractive power; a third lens with positive refractive power; and a fourth lens with Refractive power; a fifth lens with refractive power; and a sixth lens with positive refractive power, the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and The sixth lens is arranged in order from the object side to the image side along an optical axis; the imaging lens satisfies the following conditions: 4.5mm<f+f ₄ <5.7mm; where f _{4 is} one of the effective focal lengths of the fourth lens , F is one of the effective focal lengths of the imaging lens.

Please refer to Table 1, Table 3, and Table 5 below. Table 1, Table 3, and Table 5 are related parameter tables of each lens of the first embodiment to the third embodiment of the imaging lens according to the present invention.

Figures 1, 3, and 5 are schematic diagrams of the lens configuration of the first, second, and third embodiments of the imaging lens of the present invention. The first lenses L11, L21, and L31 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S11, S21, S31 are convex surfaces, the image side surfaces S12, S22, S32 are concave surfaces, and the object side surfaces S11, S21, S31 and the image side surfaces S12, S22, S32 are spherical surfaces.

The second lenses L12, L22, and L32 are double convex lenses with positive refractive power and are made of glass. The object side surfaces S13, S23, S33 are convex surfaces, and the image side surfaces S14, S24, S34 are convex surfaces. The object side surfaces S13, S23, S33 and The image sides S14, S24, and S34 are all spherical surfaces.

The third lenses L13, L23, and L33 are meniscus lenses with positive refractive power and are made of glass. The object side surfaces S15, S25, and S35 are convex surfaces, the image side surfaces S16, S26, and S36 are concave surfaces, and the object side surfaces S15, S25, S35 and the image side surface S16, S26, S36 are all spherical surfaces.

The fourth lens L14, L24, and L34 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S18, S28, S38 are concave surfaces, the image side surfaces S19, S29, and S39 are concave surfaces, and the object side surfaces S18, S28, S38 and The image sides S19, S29, and S39 are all spherical surfaces.

The fifth lens L15, L25, L35 is a double convex lens with positive refractive power, made of glass material, its object side surface S19, S29, S39 is convex surface, the image side surface S110, S210, S310 is convex surface, the object side surface S19, S29, S39 and The image sides S110, S210, and S310 are all spherical surfaces.

The sixth lens L16, L26, L36 has positive refractive power and is made of glass material, The object side surfaces S111, S211, S311 are convex surfaces, and the object side surfaces S111, S211, S311 are spherical surfaces.

The fourth lenses L14, L24, and L34 are cemented with the fifth lenses L15, L25, and L35, respectively.

In addition, the imaging lenses 1, 2, and 3 meet at least one of the following conditions:

0.2<|f ₅ /f|<1.5 (1)

0.8<|f ₁ /f|<2.9 (2)

0.5<|f ₂ /f|<2.6 (3)

0.2<|f ₄ /f|<1.5 (4)

0.3<|f ₆ /f|<2.4 (5)

0.1<|BFL/TTL|<0.6 (6)

-10mm<f+f ₁ <-7mm (7)

24mm<f+f ₂ <25mm (8)

103.7mm<f+f ₃ <199.8mm (9)

4.5mm<f+f ₄ <5.7mm (10)

14.5mm<f+f ₅ <15mm (11)

21.2mm<f+f ₆ <23.6mm (12)

Among them, f ₁ is the effective focal length of one of the first lenses L11, L21, L31 in the _{first embodiment to the third embodiment, and f 2} is the second lens L12, L22, and L22 in the first embodiment to the third embodiment. L32 is an effective focal length, f ₃ is an effective focal length of the third lens L13, L23, L33 in the _{first embodiment to the third embodiment, f 4} is the fourth lens in the first embodiment to the third embodiment One of the effective focal lengths of L14, L24, L34, f ₅ is the effective focal length of the fifth lens L15, L25, L35 in the _{first embodiment to the third embodiment, f 6} is the effective focal length of the first embodiment to the third embodiment , One of the effective focal lengths of the sixth lens L16, L26, L36, f is the effective focal length of one of the imaging lenses 1, 2, and 3 in the first embodiment to the third embodiment, and BFL is the first embodiment to the third embodiment Among them, the image sides S112, S212, and S312 of the sixth lenses L16, L26, and L36 are spaced from the imaging planes IMA1, IMA2, IMA3 on the optical axis OA1, OA2, OA3, respectively. In an example, the object side surfaces S11, S21, and S31 of the first lenses L11, L21, and L31 are spaced apart from the imaging planes IMA1, IMA2, IMA3 on the optical axis OA1, OA2, OA3, respectively. The imaging lens 1, 2, and 3 can effectively reduce the aperture value, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct aberrations, and effectively correct chromatic aberrations.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to FIG. 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 first lens L11, a second lens L12, a second lens L11, a third lens Four lenses L14, a fifth lens L15, a sixth lens L16, 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 10 of the [implementation mode], the sixth lens L16 is a biconvex lens, the image side surface S112 is a convex surface, and the image side surface S112 is a spherical surface; the object side surface S113 and the image side surface S114 of the filter OF1 are both flat The protective glass CG1, whose object side surface S115 and image side surface S116 are both flat surfaces; using the above-mentioned lens, aperture ST1 and a design that satisfies at least one of the conditions (1) to (12), the imaging lens 1 can effectively reduce the aperture value , Effectively improve resolution, effective resistance to environmental temperature changes, effective correction of aberration, effective correction of chromatic aberration.

Table 1 is a table of related parameters of each lens of the imaging lens 1 in Figure 1.

Table 2 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 2, it can be seen that the imaging lens 1 of the first embodiment can all satisfy the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from Fig. 2A that the longitudinal aberration of the imaging lens 1 of the first embodiment is between -0.01 mm and 0.04 mm. It can be seen from FIG. 2B that the curvature of field of the imaging lens 1 of the first embodiment is between -0.06mm and 0.04mm. It can be seen from Figure 2C that the distortion of the imaging lens 1 of the first embodiment is between -2% to 0%. It can be seen from Fig. 2D that the lateral chromatic aberration of the imaging lens 1 of the first embodiment is between -1 μm and 4.5 μm. It can be seen from FIG. 2E that the relative illuminance of the imaging lens 1 of the first embodiment is between 0.76 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 0.58 and 1.0. It can be seen from Fig. 2G that the imaging lens 1 of the first embodiment has a modulation transfer function value between 0.0 and 0.9 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected, and the relative illuminance, lens resolution, and focal depth can also meet the requirements, thereby obtaining 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 first lens L21 in sequence from an object side to an image side along an optical axis OA2. Five lenses L25, a sixth lens L26 and a filter OF2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to tenth paragraphs of [Embodiment], wherein: the sixth lens L26 is a plano-convex lens, and the image side surface S212 is a flat surface; the object side surface S213 and the image side surface S214 of the filter OF2 are both flat surfaces; the above lens and aperture ST2 are used And a design that satisfies at least one of the conditions (1) to (12), so that the imaging lens 2 can effectively reduce the aperture value, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct aberrations, and effectively Correct the chromatic aberration.

Table 3 is a table of related parameters of each lens of the imaging lens 2 in Figure 3.

Table 4 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 4, it can be seen that the imaging lens 2 of the second embodiment can all satisfy the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. It can be seen from Fig. 4A that the longitudinal aberration of the imaging lens 2 of the second embodiment is between -0.02 mm and 0.04 mm. It can be seen from FIG. 4B that the curvature of field of the imaging lens 2 of the second embodiment is between -0.04mm and 0.04mm. It can be seen from FIG. 4C that the distortion of the imaging lens 2 of the second embodiment is between -2.2% and 0%. It can be seen from Fig. 4D that the lateral chromatic aberration of the imaging lens 2 of the second embodiment Between -1.5μm to 5.0μm. It can be seen from FIG. 4E that the relative illuminance of the imaging lens 2 of the second embodiment is between 0.98 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. 4G that the imaging lens 2 of the second embodiment has a modulation transfer function value between 0.0 and 0.88 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 2 of the second embodiment can be effectively corrected, and the relative illuminance, lens resolution, and focal depth can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of the lens configuration of the third embodiment of the imaging lens according to the present invention. The imaging lens 3 includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, and a first lens L31 in sequence from an object side to an image side along an optical axis OA3. Five lenses L35, a sixth lens L36, a filter OF3 and a protective glass CG3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to tenth paragraphs of [Embodiment], the sixth lens L36 is a biconvex lens, the image side surface S312 is a convex surface, and the image side surface S312 is a spherical surface; the object side surface S313 and the image side surface S314 of the filter OF3 are both flat ; The protective glass CG3 whose object side S315 and image side S316 are both flat; using the above-mentioned lens, aperture ST3 and a design that meets at least one of the conditions (1) to (12), the imaging lens 3 can effectively reduce the aperture value , Effectively improve resolution, effective resistance to environmental temperature changes, effective correction of aberration, effective correction of chromatic aberration.

Table 5 is a table of related parameters of each lens of the imaging lens 3 in Figure 5.

Table 6 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 6, it can be seen that the imaging lens 3 of the third embodiment can all satisfy the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. It can be seen from Figure 6A that the imaging lens 3 of the third embodiment has a longitudinal aberration between -0.01 mm and 0.06 mm. It can be seen from FIG. 6B that the field curvature of the imaging lens 3 of the third embodiment is between -0.02 mm and 0.04 mm. It can be seen from Fig. 6C that the distortion of the imaging lens 3 of the third embodiment is between -Between 3.5% and 0%. It can be seen from FIG. 6D that the lateral chromatic aberration of the imaging lens 3 of the third embodiment is between -1.0 μm and 4.5 μm. It can be seen from FIG. 6E that the relative illuminance of the imaging lens 3 of the third embodiment is between 0.72 and 1.0. It can be seen from FIG. 6F that the value of the modulation transfer function of the imaging lens 3 of the third embodiment is between 0.53 and 1.0. It can be seen from Fig. 6G that the imaging lens 3 of the third embodiment has a modulation transfer function value between 0.0 and 0.86 when the focus shift is between -0.05 mm and 0.05 mm.

It is obvious that the longitudinal aberration, curvature of field, distortion, and lateral chromatic aberration of the imaging lens 3 of the third embodiment can be effectively corrected, and the relative illuminance, lens resolution, and focal depth can also meet the requirements, thereby obtaining 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

ST1‧‧‧Aperture

OA1‧‧‧Optical axis

OF1‧‧‧Filter

CG1‧‧‧Protection glass

IMA1‧‧‧imaging surface

S11‧‧‧Object side of the first lens

S12‧‧‧The side of the first lens image

S13‧‧‧Second lens object side

S14‧‧‧Second lens image side

S15‧‧‧Third lens object side

S16‧‧‧Third lens image side

S17‧‧‧Aperture surface

S18‧‧‧Fourth lens object side

S19‧‧‧Fourth lens image side (fifth lens object side)

S110‧‧‧Fifth lens image side

S111‧‧‧Sixth lens object side

S112‧‧‧Sixth lens image side

S113‧‧‧The side of the filter object

S114‧‧‧Filter image side

S115‧‧‧Protect the side of the glass object

S116‧‧‧Protect the side of the glass image

Claims (10)

An imaging lens comprising: a first lens with refractive power, the first lens including a convex surface facing an object side; a second lens with positive refractive power; a third lens with positive refractive power; a fourth lens with refractive power; Five lenses have positive refractive power; and a sixth lens has positive refractive power, and the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, and the first lens The five lenses and the sixth lens are arranged in order from the object side to the image side along an optical axis; the imaging lens satisfies the following conditions: 0.2<|f ₅ /f|<1.5; where f _{5 is} the fifth An effective focal length of the lens, f is an effective focal length of the imaging lens. According to the imaging lens of claim 1, wherein the fifth lens includes a convex surface facing the object side and another convex surface facing the image side. An imaging lens includes: a first lens with refractive power, the first lens including a convex surface facing an object side; a second lens with positive refractive power; a third lens with positive refractive power; a fourth lens with refractive power; Five lenses have refractive power; and a sixth lens has positive refractive power, and the sixth lens includes a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens The lens and the sixth lens are arranged in order from the object side to the image side along an optical axis; the imaging lens satisfies the following conditions: 4.5mm<f+f ₄ <5.7mm; where f _{4 is} the fourth lens Is an effective focal length, and f is an effective focal length of the imaging lens. According to the imaging lens described in item 3 of the scope of patent application, the fourth lens element has a negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The imaging lens according to any one of claims 1 or 3 of the scope of patent application, wherein: the second lens includes a convex surface facing the object side and another convex surface facing the image side; and the third lens includes A convex surface faces the object side and a concave surface faces the image side. The imaging lens according to any one of claims 1 or 3 in the scope of the patent application, wherein the first lens has a negative refractive power and further includes a concave surface facing the image side. According to the imaging lens described in item 1 or item 3 of the scope of patent application, the sixth lens further includes a convex surface facing the image side or a flat surface facing the image side. Such as the imaging lens described in any one of claims 1 to 4 of the scope of patent application, wherein the imaging lens meets at least one of the following conditions: 0.8<|f ₁ /f|<2.9 _{; 0.5<|f 2 /f|<2.6;0.3<|f 6 /f|<2.4;-10mm<f+f 1 <-7mm; 24mm} <f + f 2 <25mm; 103.7mm <f + f 3 <199.8mm; 21.2mm <f+f ₆ <23.6mm;0.1<|BFL/TTL|<0.6; where f _{1 is} an effective focal length of the first lens, f _{2 is} an effective focal length of the second lens, and f _{3 is} the first lens. One of the effective focal lengths of the three lenses, f _{6 is} one of the effective focal lengths of the sixth lens, f is one of the effective focal lengths of the imaging lens, BFL is one of the image side of the sixth lens to an imaging surface on the optical axis Pitch, TTL is a pitch from an object side of the first lens to the imaging surface on the optical axis. Such as the imaging lens described in any one of claims 1 to 4 of the scope of patent application, wherein the imaging lens meets at least one of the following conditions: 0.2<|f ₄ /f|<1.5;14.5mm<f+ f ₅ <15mm; where f _{4 is} an effective focal length of the fourth lens, f _{5 is} an effective focal length of the fifth lens, and f is an effective focal length of the imaging lens. The imaging lens according to item 9 of the scope of patent application, wherein the fourth lens and the fifth lens are cemented.

Images